fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57 #include <linux/iversion.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "sysfs.h"
  67 #include "nfs4idmap.h"
  68 #include "nfs4session.h"
  69 #include "fscache.h"
  70 #include "nfs42.h"
  71
  72 #include "nfs4trace.h"
  73
  74 #define NFSDBG_FACILITY         NFSDBG_PROC
  75
  76 #define NFS4_BITMASK_SZ         3
  77
  78 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  79 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  80
  81 /* file attributes which can be mapped to nfs attributes */
  82 #define NFS4_VALID_ATTRS (ATTR_MODE \
  83         | ATTR_UID \
  84         | ATTR_GID \
  85         | ATTR_SIZE \
  86         | ATTR_ATIME \
  87         | ATTR_MTIME \
  88         | ATTR_CTIME \
  89         | ATTR_ATIME_SET \
  90         | ATTR_MTIME_SET)
  91
  92 struct nfs4_opendata;
  93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  97                               struct nfs_fattr *fattr, struct inode *inode);
  98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
  99                             struct nfs_fattr *fattr, struct iattr *sattr,
 100                             struct nfs_open_context *ctx, struct nfs4_label *ilabel);
 101 #ifdef CONFIG_NFS_V4_1
 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 103                 const struct cred *cred,
 104                 struct nfs4_slot *slot,
 105                 bool is_privileged);
 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 107                 const struct cred *);
 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 109                 const struct cred *, bool);
 110 #endif
 111
 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 113 static inline struct nfs4_label *
 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 115         struct iattr *sattr, struct nfs4_label *label)
 116 {
 117         int err;
 118
 119         if (label == NULL)
 120                 return NULL;
 121
 122         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 123                 return NULL;
 124
 125         label->lfs = 0;
 126         label->pi = 0;
 127         label->len = 0;
 128         label->label = NULL;
 129
 130         err = security_dentry_init_security(dentry, sattr->ia_mode,
 131                                 &dentry->d_name, NULL,
 132                                 (void **)&label->label, &label->len);
 133         if (err == 0)
 134                 return label;
 135
 136         return NULL;
 137 }
 138 static inline void
 139 nfs4_label_release_security(struct nfs4_label *label)
 140 {
 141         if (label)
 142                 security_release_secctx(label->label, label->len);
 143 }
 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 145 {
 146         if (label)
 147                 return server->attr_bitmask;
 148
 149         return server->attr_bitmask_nl;
 150 }
 151 #else
 152 static inline struct nfs4_label *
 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 154         struct iattr *sattr, struct nfs4_label *l)
 155 { return NULL; }
 156 static inline void
 157 nfs4_label_release_security(struct nfs4_label *label)
 158 { return; }
 159 static inline u32 *
 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 161 { return server->attr_bitmask; }
 162 #endif
 163
 164 /* Prevent leaks of NFSv4 errors into userland */
 165 static int nfs4_map_errors(int err)
 166 {
 167         if (err >= -1000)
 168                 return err;
 169         switch (err) {
 170         case -NFS4ERR_RESOURCE:
 171         case -NFS4ERR_LAYOUTTRYLATER:
 172         case -NFS4ERR_RECALLCONFLICT:
 173         case -NFS4ERR_RETURNCONFLICT:
 174                 return -EREMOTEIO;
 175         case -NFS4ERR_WRONGSEC:
 176         case -NFS4ERR_WRONG_CRED:
 177                 return -EPERM;
 178         case -NFS4ERR_BADOWNER:
 179         case -NFS4ERR_BADNAME:
 180                 return -EINVAL;
 181         case -NFS4ERR_SHARE_DENIED:
 182                 return -EACCES;
 183         case -NFS4ERR_MINOR_VERS_MISMATCH:
 184                 return -EPROTONOSUPPORT;
 185         case -NFS4ERR_FILE_OPEN:
 186                 return -EBUSY;
 187         case -NFS4ERR_NOT_SAME:
 188                 return -ENOTSYNC;
 189         default:
 190                 dprintk("%s could not handle NFSv4 error %d\n",
 191                                 __func__, -err);
 192                 break;
 193         }
 194         return -EIO;
 195 }
 196
 197 /*
 198  * This is our standard bitmap for GETATTR requests.
 199  */
 200 const u32 nfs4_fattr_bitmap[3] = {
 201         FATTR4_WORD0_TYPE
 202         | FATTR4_WORD0_CHANGE
 203         | FATTR4_WORD0_SIZE
 204         | FATTR4_WORD0_FSID
 205         | FATTR4_WORD0_FILEID,
 206         FATTR4_WORD1_MODE
 207         | FATTR4_WORD1_NUMLINKS
 208         | FATTR4_WORD1_OWNER
 209         | FATTR4_WORD1_OWNER_GROUP
 210         | FATTR4_WORD1_RAWDEV
 211         | FATTR4_WORD1_SPACE_USED
 212         | FATTR4_WORD1_TIME_ACCESS
 213         | FATTR4_WORD1_TIME_METADATA
 214         | FATTR4_WORD1_TIME_MODIFY
 215         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 217         FATTR4_WORD2_SECURITY_LABEL
 218 #endif
 219 };
 220
 221 static const u32 nfs4_pnfs_open_bitmap[3] = {
 222         FATTR4_WORD0_TYPE
 223         | FATTR4_WORD0_CHANGE
 224         | FATTR4_WORD0_SIZE
 225         | FATTR4_WORD0_FSID
 226         | FATTR4_WORD0_FILEID,
 227         FATTR4_WORD1_MODE
 228         | FATTR4_WORD1_NUMLINKS
 229         | FATTR4_WORD1_OWNER
 230         | FATTR4_WORD1_OWNER_GROUP
 231         | FATTR4_WORD1_RAWDEV
 232         | FATTR4_WORD1_SPACE_USED
 233         | FATTR4_WORD1_TIME_ACCESS
 234         | FATTR4_WORD1_TIME_METADATA
 235         | FATTR4_WORD1_TIME_MODIFY,
 236         FATTR4_WORD2_MDSTHRESHOLD
 237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 238         | FATTR4_WORD2_SECURITY_LABEL
 239 #endif
 240 };
 241
 242 static const u32 nfs4_open_noattr_bitmap[3] = {
 243         FATTR4_WORD0_TYPE
 244         | FATTR4_WORD0_FILEID,
 245 };
 246
 247 const u32 nfs4_statfs_bitmap[3] = {
 248         FATTR4_WORD0_FILES_AVAIL
 249         | FATTR4_WORD0_FILES_FREE
 250         | FATTR4_WORD0_FILES_TOTAL,
 251         FATTR4_WORD1_SPACE_AVAIL
 252         | FATTR4_WORD1_SPACE_FREE
 253         | FATTR4_WORD1_SPACE_TOTAL
 254 };
 255
 256 const u32 nfs4_pathconf_bitmap[3] = {
 257         FATTR4_WORD0_MAXLINK
 258         | FATTR4_WORD0_MAXNAME,
 259         0
 260 };
 261
 262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 263                         | FATTR4_WORD0_MAXREAD
 264                         | FATTR4_WORD0_MAXWRITE
 265                         | FATTR4_WORD0_LEASE_TIME,
 266                         FATTR4_WORD1_TIME_DELTA
 267                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 268                         FATTR4_WORD2_LAYOUT_BLKSIZE
 269                         | FATTR4_WORD2_CLONE_BLKSIZE
 270                         | FATTR4_WORD2_CHANGE_ATTR_TYPE
 271                         | FATTR4_WORD2_XATTR_SUPPORT
 272 };
 273
 274 const u32 nfs4_fs_locations_bitmap[3] = {
 275         FATTR4_WORD0_CHANGE
 276         | FATTR4_WORD0_SIZE
 277         | FATTR4_WORD0_FSID
 278         | FATTR4_WORD0_FILEID
 279         | FATTR4_WORD0_FS_LOCATIONS,
 280         FATTR4_WORD1_OWNER
 281         | FATTR4_WORD1_OWNER_GROUP
 282         | FATTR4_WORD1_RAWDEV
 283         | FATTR4_WORD1_SPACE_USED
 284         | FATTR4_WORD1_TIME_ACCESS
 285         | FATTR4_WORD1_TIME_METADATA
 286         | FATTR4_WORD1_TIME_MODIFY
 287         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 288 };
 289
 290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 291                                     struct inode *inode, unsigned long flags)
 292 {
 293         unsigned long cache_validity;
 294
 295         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 296         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 297                 return;
 298
 299         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
 300
 301         /* Remove the attributes over which we have full control */
 302         dst[1] &= ~FATTR4_WORD1_RAWDEV;
 303         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 304                 dst[0] &= ~FATTR4_WORD0_SIZE;
 305
 306         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 307                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 308
 309         if (!(cache_validity & NFS_INO_INVALID_MODE))
 310                 dst[1] &= ~FATTR4_WORD1_MODE;
 311         if (!(cache_validity & NFS_INO_INVALID_OTHER))
 312                 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
 313 }
 314
 315 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 316                 struct nfs4_readdir_arg *readdir)
 317 {
 318         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 319         __be32 *start, *p;
 320
 321         if (cookie > 2) {
 322                 readdir->cookie = cookie;
 323                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 324                 return;
 325         }
 326
 327         readdir->cookie = 0;
 328         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 329         if (cookie == 2)
 330                 return;
 331
 332         /*
 333          * NFSv4 servers do not return entries for '.' and '..'
 334          * Therefore, we fake these entries here.  We let '.'
 335          * have cookie 0 and '..' have cookie 1.  Note that
 336          * when talking to the server, we always send cookie 0
 337          * instead of 1 or 2.
 338          */
 339         start = p = kmap_atomic(*readdir->pages);
 340
 341         if (cookie == 0) {
 342                 *p++ = xdr_one;                                  /* next */
 343                 *p++ = xdr_zero;                   /* cookie, first word */
 344                 *p++ = xdr_one;                   /* cookie, second word */
 345                 *p++ = xdr_one;                             /* entry len */
 346                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 347                 p++;
 348                 *p++ = xdr_one;                         /* bitmap length */
 349                 *p++ = htonl(attrs);                           /* bitmap */
 350                 *p++ = htonl(12);             /* attribute buffer length */
 351                 *p++ = htonl(NF4DIR);
 352                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 353         }
 354
 355         *p++ = xdr_one;                                  /* next */
 356         *p++ = xdr_zero;                   /* cookie, first word */
 357         *p++ = xdr_two;                   /* cookie, second word */
 358         *p++ = xdr_two;                             /* entry len */
 359         memcpy(p, "..\0\0", 4);                         /* entry */
 360         p++;
 361         *p++ = xdr_one;                         /* bitmap length */
 362         *p++ = htonl(attrs);                           /* bitmap */
 363         *p++ = htonl(12);             /* attribute buffer length */
 364         *p++ = htonl(NF4DIR);
 365         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 366
 367         readdir->pgbase = (char *)p - (char *)start;
 368         readdir->count -= readdir->pgbase;
 369         kunmap_atomic(start);
 370 }
 371
 372 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
 373 {
 374         if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
 375                 fattr->pre_change_attr = version;
 376                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
 377         }
 378 }
 379
 380 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 381                 nfs4_stateid *stateid,
 382                 const struct cred *cred)
 383 {
 384         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 385
 386         ops->test_and_free_expired(server, stateid, cred);
 387 }
 388
 389 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 390                 nfs4_stateid *stateid,
 391                 const struct cred *cred)
 392 {
 393         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 394         nfs4_test_and_free_stateid(server, stateid, cred);
 395 }
 396
 397 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 398                 const nfs4_stateid *stateid,
 399                 const struct cred *cred)
 400 {
 401         nfs4_stateid tmp;
 402
 403         nfs4_stateid_copy(&tmp, stateid);
 404         __nfs4_free_revoked_stateid(server, &tmp, cred);
 405 }
 406
 407 static long nfs4_update_delay(long *timeout)
 408 {
 409         long ret;
 410         if (!timeout)
 411                 return NFS4_POLL_RETRY_MAX;
 412         if (*timeout <= 0)
 413                 *timeout = NFS4_POLL_RETRY_MIN;
 414         if (*timeout > NFS4_POLL_RETRY_MAX)
 415                 *timeout = NFS4_POLL_RETRY_MAX;
 416         ret = *timeout;
 417         *timeout <<= 1;
 418         return ret;
 419 }
 420
 421 static int nfs4_delay_killable(long *timeout)
 422 {
 423         might_sleep();
 424
 425         __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
 426         schedule_timeout(nfs4_update_delay(timeout));
 427         if (!__fatal_signal_pending(current))
 428                 return 0;
 429         return -EINTR;
 430 }
 431
 432 static int nfs4_delay_interruptible(long *timeout)
 433 {
 434         might_sleep();
 435
 436         __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
 437         schedule_timeout(nfs4_update_delay(timeout));
 438         if (!signal_pending(current))
 439                 return 0;
 440         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 441 }
 442
 443 static int nfs4_delay(long *timeout, bool interruptible)
 444 {
 445         if (interruptible)
 446                 return nfs4_delay_interruptible(timeout);
 447         return nfs4_delay_killable(timeout);
 448 }
 449
 450 static const nfs4_stateid *
 451 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 452 {
 453         if (!stateid)
 454                 return NULL;
 455         switch (stateid->type) {
 456         case NFS4_OPEN_STATEID_TYPE:
 457         case NFS4_LOCK_STATEID_TYPE:
 458         case NFS4_DELEGATION_STATEID_TYPE:
 459                 return stateid;
 460         default:
 461                 break;
 462         }
 463         return NULL;
 464 }
 465
 466 /* This is the error handling routine for processes that are allowed
 467  * to sleep.
 468  */
 469 static int nfs4_do_handle_exception(struct nfs_server *server,
 470                 int errorcode, struct nfs4_exception *exception)
 471 {
 472         struct nfs_client *clp = server->nfs_client;
 473         struct nfs4_state *state = exception->state;
 474         const nfs4_stateid *stateid;
 475         struct inode *inode = exception->inode;
 476         int ret = errorcode;
 477
 478         exception->delay = 0;
 479         exception->recovering = 0;
 480         exception->retry = 0;
 481
 482         stateid = nfs4_recoverable_stateid(exception->stateid);
 483         if (stateid == NULL && state != NULL)
 484                 stateid = nfs4_recoverable_stateid(&state->stateid);
 485
 486         switch(errorcode) {
 487                 case 0:
 488                         return 0;
 489                 case -NFS4ERR_BADHANDLE:
 490                 case -ESTALE:
 491                         if (inode != NULL && S_ISREG(inode->i_mode))
 492                                 pnfs_destroy_layout(NFS_I(inode));
 493                         break;
 494                 case -NFS4ERR_DELEG_REVOKED:
 495                 case -NFS4ERR_ADMIN_REVOKED:
 496                 case -NFS4ERR_EXPIRED:
 497                 case -NFS4ERR_BAD_STATEID:
 498                 case -NFS4ERR_PARTNER_NO_AUTH:
 499                         if (inode != NULL && stateid != NULL) {
 500                                 nfs_inode_find_state_and_recover(inode,
 501                                                 stateid);
 502                                 goto wait_on_recovery;
 503                         }
 504                         fallthrough;
 505                 case -NFS4ERR_OPENMODE:
 506                         if (inode) {
 507                                 int err;
 508
 509                                 err = nfs_async_inode_return_delegation(inode,
 510                                                 stateid);
 511                                 if (err == 0)
 512                                         goto wait_on_recovery;
 513                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 514                                         exception->retry = 1;
 515                                         break;
 516                                 }
 517                         }
 518                         if (state == NULL)
 519                                 break;
 520                         ret = nfs4_schedule_stateid_recovery(server, state);
 521                         if (ret < 0)
 522                                 break;
 523                         goto wait_on_recovery;
 524                 case -NFS4ERR_STALE_STATEID:
 525                 case -NFS4ERR_STALE_CLIENTID:
 526                         nfs4_schedule_lease_recovery(clp);
 527                         goto wait_on_recovery;
 528                 case -NFS4ERR_MOVED:
 529                         ret = nfs4_schedule_migration_recovery(server);
 530                         if (ret < 0)
 531                                 break;
 532                         goto wait_on_recovery;
 533                 case -NFS4ERR_LEASE_MOVED:
 534                         nfs4_schedule_lease_moved_recovery(clp);
 535                         goto wait_on_recovery;
 536 #if defined(CONFIG_NFS_V4_1)
 537                 case -NFS4ERR_BADSESSION:
 538                 case -NFS4ERR_BADSLOT:
 539                 case -NFS4ERR_BAD_HIGH_SLOT:
 540                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 541                 case -NFS4ERR_DEADSESSION:
 542                 case -NFS4ERR_SEQ_FALSE_RETRY:
 543                 case -NFS4ERR_SEQ_MISORDERED:
 544                         /* Handled in nfs41_sequence_process() */
 545                         goto wait_on_recovery;
 546 #endif /* defined(CONFIG_NFS_V4_1) */
 547                 case -NFS4ERR_FILE_OPEN:
 548                         if (exception->timeout > HZ) {
 549                                 /* We have retried a decent amount, time to
 550                                  * fail
 551                                  */
 552                                 ret = -EBUSY;
 553                                 break;
 554                         }
 555                         fallthrough;
 556                 case -NFS4ERR_DELAY:
 557                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 558                         fallthrough;
 559                 case -NFS4ERR_GRACE:
 560                 case -NFS4ERR_LAYOUTTRYLATER:
 561                 case -NFS4ERR_RECALLCONFLICT:
 562                 case -NFS4ERR_RETURNCONFLICT:
 563                         exception->delay = 1;
 564                         return 0;
 565
 566                 case -NFS4ERR_RETRY_UNCACHED_REP:
 567                 case -NFS4ERR_OLD_STATEID:
 568                         exception->retry = 1;
 569                         break;
 570                 case -NFS4ERR_BADOWNER:
 571                         /* The following works around a Linux server bug! */
 572                 case -NFS4ERR_BADNAME:
 573                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 574                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 575                                 exception->retry = 1;
 576                                 printk(KERN_WARNING "NFS: v4 server %s "
 577                                                 "does not accept raw "
 578                                                 "uid/gids. "
 579                                                 "Reenabling the idmapper.\n",
 580                                                 server->nfs_client->cl_hostname);
 581                         }
 582         }
 583         /* We failed to handle the error */
 584         return nfs4_map_errors(ret);
 585 wait_on_recovery:
 586         exception->recovering = 1;
 587         return 0;
 588 }
 589
 590 /* This is the error handling routine for processes that are allowed
 591  * to sleep.
 592  */
 593 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 594 {
 595         struct nfs_client *clp = server->nfs_client;
 596         int ret;
 597
 598         ret = nfs4_do_handle_exception(server, errorcode, exception);
 599         if (exception->delay) {
 600                 ret = nfs4_delay(&exception->timeout,
 601                                 exception->interruptible);
 602                 goto out_retry;
 603         }
 604         if (exception->recovering) {
 605                 if (exception->task_is_privileged)
 606                         return -EDEADLOCK;
 607                 ret = nfs4_wait_clnt_recover(clp);
 608                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 609                         return -EIO;
 610                 goto out_retry;
 611         }
 612         return ret;
 613 out_retry:
 614         if (ret == 0)
 615                 exception->retry = 1;
 616         return ret;
 617 }
 618
 619 static int
 620 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 621                 int errorcode, struct nfs4_exception *exception)
 622 {
 623         struct nfs_client *clp = server->nfs_client;
 624         int ret;
 625
 626         ret = nfs4_do_handle_exception(server, errorcode, exception);
 627         if (exception->delay) {
 628                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 629                 goto out_retry;
 630         }
 631         if (exception->recovering) {
 632                 if (exception->task_is_privileged)
 633                         return -EDEADLOCK;
 634                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 635                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 636                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 637                 goto out_retry;
 638         }
 639         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 640                 ret = -EIO;
 641         return ret;
 642 out_retry:
 643         if (ret == 0) {
 644                 exception->retry = 1;
 645                 /*
 646                  * For NFS4ERR_MOVED, the client transport will need to
 647                  * be recomputed after migration recovery has completed.
 648                  */
 649                 if (errorcode == -NFS4ERR_MOVED)
 650                         rpc_task_release_transport(task);
 651         }
 652         return ret;
 653 }
 654
 655 int
 656 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 657                         struct nfs4_state *state, long *timeout)
 658 {
 659         struct nfs4_exception exception = {
 660                 .state = state,
 661         };
 662
 663         if (task->tk_status >= 0)
 664                 return 0;
 665         if (timeout)
 666                 exception.timeout = *timeout;
 667         task->tk_status = nfs4_async_handle_exception(task, server,
 668                         task->tk_status,
 669                         &exception);
 670         if (exception.delay && timeout)
 671                 *timeout = exception.timeout;
 672         if (exception.retry)
 673                 return -EAGAIN;
 674         return 0;
 675 }
 676
 677 /*
 678  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 679  * or 'false' otherwise.
 680  */
 681 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 682 {
 683         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 684         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 685 }
 686
 687 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 688 {
 689         spin_lock(&clp->cl_lock);
 690         if (time_before(clp->cl_last_renewal,timestamp))
 691                 clp->cl_last_renewal = timestamp;
 692         spin_unlock(&clp->cl_lock);
 693 }
 694
 695 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 696 {
 697         struct nfs_client *clp = server->nfs_client;
 698
 699         if (!nfs4_has_session(clp))
 700                 do_renew_lease(clp, timestamp);
 701 }
 702
 703 struct nfs4_call_sync_data {
 704         const struct nfs_server *seq_server;
 705         struct nfs4_sequence_args *seq_args;
 706         struct nfs4_sequence_res *seq_res;
 707 };
 708
 709 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 710                         struct nfs4_sequence_res *res, int cache_reply,
 711                         int privileged)
 712 {
 713         args->sa_slot = NULL;
 714         args->sa_cache_this = cache_reply;
 715         args->sa_privileged = privileged;
 716
 717         res->sr_slot = NULL;
 718 }
 719
 720 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 721 {
 722         struct nfs4_slot *slot = res->sr_slot;
 723         struct nfs4_slot_table *tbl;
 724
 725         tbl = slot->table;
 726         spin_lock(&tbl->slot_tbl_lock);
 727         if (!nfs41_wake_and_assign_slot(tbl, slot))
 728                 nfs4_free_slot(tbl, slot);
 729         spin_unlock(&tbl->slot_tbl_lock);
 730
 731         res->sr_slot = NULL;
 732 }
 733
 734 static int nfs40_sequence_done(struct rpc_task *task,
 735                                struct nfs4_sequence_res *res)
 736 {
 737         if (res->sr_slot != NULL)
 738                 nfs40_sequence_free_slot(res);
 739         return 1;
 740 }
 741
 742 #if defined(CONFIG_NFS_V4_1)
 743
 744 static void nfs41_release_slot(struct nfs4_slot *slot)
 745 {
 746         struct nfs4_session *session;
 747         struct nfs4_slot_table *tbl;
 748         bool send_new_highest_used_slotid = false;
 749
 750         if (!slot)
 751                 return;
 752         tbl = slot->table;
 753         session = tbl->session;
 754
 755         /* Bump the slot sequence number */
 756         if (slot->seq_done)
 757                 slot->seq_nr++;
 758         slot->seq_done = 0;
 759
 760         spin_lock(&tbl->slot_tbl_lock);
 761         /* Be nice to the server: try to ensure that the last transmitted
 762          * value for highest_user_slotid <= target_highest_slotid
 763          */
 764         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 765                 send_new_highest_used_slotid = true;
 766
 767         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 768                 send_new_highest_used_slotid = false;
 769                 goto out_unlock;
 770         }
 771         nfs4_free_slot(tbl, slot);
 772
 773         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 774                 send_new_highest_used_slotid = false;
 775 out_unlock:
 776         spin_unlock(&tbl->slot_tbl_lock);
 777         if (send_new_highest_used_slotid)
 778                 nfs41_notify_server(session->clp);
 779         if (waitqueue_active(&tbl->slot_waitq))
 780                 wake_up_all(&tbl->slot_waitq);
 781 }
 782
 783 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 784 {
 785         nfs41_release_slot(res->sr_slot);
 786         res->sr_slot = NULL;
 787 }
 788
 789 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 790                 u32 seqnr)
 791 {
 792         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 793                 slot->seq_nr_highest_sent = seqnr;
 794 }
 795 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
 796 {
 797         nfs4_slot_sequence_record_sent(slot, seqnr);
 798         slot->seq_nr_last_acked = seqnr;
 799 }
 800
 801 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 802                                 struct nfs4_slot *slot)
 803 {
 804         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 805         if (!IS_ERR(task))
 806                 rpc_put_task_async(task);
 807 }
 808
 809 static int nfs41_sequence_process(struct rpc_task *task,
 810                 struct nfs4_sequence_res *res)
 811 {
 812         struct nfs4_session *session;
 813         struct nfs4_slot *slot = res->sr_slot;
 814         struct nfs_client *clp;
 815         int status;
 816         int ret = 1;
 817
 818         if (slot == NULL)
 819                 goto out_noaction;
 820         /* don't increment the sequence number if the task wasn't sent */
 821         if (!RPC_WAS_SENT(task) || slot->seq_done)
 822                 goto out;
 823
 824         session = slot->table->session;
 825         clp = session->clp;
 826
 827         trace_nfs4_sequence_done(session, res);
 828
 829         status = res->sr_status;
 830         if (task->tk_status == -NFS4ERR_DEADSESSION)
 831                 status = -NFS4ERR_DEADSESSION;
 832
 833         /* Check the SEQUENCE operation status */
 834         switch (status) {
 835         case 0:
 836                 /* Mark this sequence number as having been acked */
 837                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 838                 /* Update the slot's sequence and clientid lease timer */
 839                 slot->seq_done = 1;
 840                 do_renew_lease(clp, res->sr_timestamp);
 841                 /* Check sequence flags */
 842                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 843                                 !!slot->privileged);
 844                 nfs41_update_target_slotid(slot->table, slot, res);
 845                 break;
 846         case 1:
 847                 /*
 848                  * sr_status remains 1 if an RPC level error occurred.
 849                  * The server may or may not have processed the sequence
 850                  * operation..
 851                  */
 852                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 853                 slot->seq_done = 1;
 854                 goto out;
 855         case -NFS4ERR_DELAY:
 856                 /* The server detected a resend of the RPC call and
 857                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 858                  * of RFC5661.
 859                  */
 860                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 861                         __func__,
 862                         slot->slot_nr,
 863                         slot->seq_nr);
 864                 goto out_retry;
 865         case -NFS4ERR_RETRY_UNCACHED_REP:
 866         case -NFS4ERR_SEQ_FALSE_RETRY:
 867                 /*
 868                  * The server thinks we tried to replay a request.
 869                  * Retry the call after bumping the sequence ID.
 870                  */
 871                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 872                 goto retry_new_seq;
 873         case -NFS4ERR_BADSLOT:
 874                 /*
 875                  * The slot id we used was probably retired. Try again
 876                  * using a different slot id.
 877                  */
 878                 if (slot->slot_nr < slot->table->target_highest_slotid)
 879                         goto session_recover;
 880                 goto retry_nowait;
 881         case -NFS4ERR_SEQ_MISORDERED:
 882                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 883                 /*
 884                  * Were one or more calls using this slot interrupted?
 885                  * If the server never received the request, then our
 886                  * transmitted slot sequence number may be too high. However,
 887                  * if the server did receive the request then it might
 888                  * accidentally give us a reply with a mismatched operation.
 889                  * We can sort this out by sending a lone sequence operation
 890                  * to the server on the same slot.
 891                  */
 892                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 893                         slot->seq_nr--;
 894                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 895                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 896                                 res->sr_slot = NULL;
 897                         }
 898                         goto retry_nowait;
 899                 }
 900                 /*
 901                  * RFC5661:
 902                  * A retry might be sent while the original request is
 903                  * still in progress on the replier. The replier SHOULD
 904                  * deal with the issue by returning NFS4ERR_DELAY as the
 905                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 906                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 907                  *
 908                  * Restart the search after a delay.
 909                  */
 910                 slot->seq_nr = slot->seq_nr_highest_sent;
 911                 goto out_retry;
 912         case -NFS4ERR_BADSESSION:
 913         case -NFS4ERR_DEADSESSION:
 914         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 915                 goto session_recover;
 916         default:
 917                 /* Just update the slot sequence no. */
 918                 slot->seq_done = 1;
 919         }
 920 out:
 921         /* The session may be reset by one of the error handlers. */
 922         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 923 out_noaction:
 924         return ret;
 925 session_recover:
 926         set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
 927         nfs4_schedule_session_recovery(session, status);
 928         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 929         nfs41_sequence_free_slot(res);
 930         goto out;
 931 retry_new_seq:
 932         ++slot->seq_nr;
 933 retry_nowait:
 934         if (rpc_restart_call_prepare(task)) {
 935                 nfs41_sequence_free_slot(res);
 936                 task->tk_status = 0;
 937                 ret = 0;
 938         }
 939         goto out;
 940 out_retry:
 941         if (!rpc_restart_call(task))
 942                 goto out;
 943         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 944         return 0;
 945 }
 946
 947 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 948 {
 949         if (!nfs41_sequence_process(task, res))
 950                 return 0;
 951         if (res->sr_slot != NULL)
 952                 nfs41_sequence_free_slot(res);
 953         return 1;
 954
 955 }
 956 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 957
 958 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 959 {
 960         if (res->sr_slot == NULL)
 961                 return 1;
 962         if (res->sr_slot->table->session != NULL)
 963                 return nfs41_sequence_process(task, res);
 964         return nfs40_sequence_done(task, res);
 965 }
 966
 967 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 968 {
 969         if (res->sr_slot != NULL) {
 970                 if (res->sr_slot->table->session != NULL)
 971                         nfs41_sequence_free_slot(res);
 972                 else
 973                         nfs40_sequence_free_slot(res);
 974         }
 975 }
 976
 977 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 978 {
 979         if (res->sr_slot == NULL)
 980                 return 1;
 981         if (!res->sr_slot->table->session)
 982                 return nfs40_sequence_done(task, res);
 983         return nfs41_sequence_done(task, res);
 984 }
 985 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 986
 987 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 988 {
 989         struct nfs4_call_sync_data *data = calldata;
 990
 991         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 992
 993         nfs4_setup_sequence(data->seq_server->nfs_client,
 994                             data->seq_args, data->seq_res, task);
 995 }
 996
 997 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 998 {
 999         struct nfs4_call_sync_data *data = calldata;
1000
1001         nfs41_sequence_done(task, data->seq_res);
1002 }
1003
1004 static const struct rpc_call_ops nfs41_call_sync_ops = {
1005         .rpc_call_prepare = nfs41_call_sync_prepare,
1006         .rpc_call_done = nfs41_call_sync_done,
1007 };
1008
1009 #else   /* !CONFIG_NFS_V4_1 */
1010
1011 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1012 {
1013         return nfs40_sequence_done(task, res);
1014 }
1015
1016 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1017 {
1018         if (res->sr_slot != NULL)
1019                 nfs40_sequence_free_slot(res);
1020 }
1021
1022 int nfs4_sequence_done(struct rpc_task *task,
1023                        struct nfs4_sequence_res *res)
1024 {
1025         return nfs40_sequence_done(task, res);
1026 }
1027 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1028
1029 #endif  /* !CONFIG_NFS_V4_1 */
1030
1031 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1032 {
1033         res->sr_timestamp = jiffies;
1034         res->sr_status_flags = 0;
1035         res->sr_status = 1;
1036 }
1037
1038 static
1039 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1040                 struct nfs4_sequence_res *res,
1041                 struct nfs4_slot *slot)
1042 {
1043         if (!slot)
1044                 return;
1045         slot->privileged = args->sa_privileged ? 1 : 0;
1046         args->sa_slot = slot;
1047
1048         res->sr_slot = slot;
1049 }
1050
1051 int nfs4_setup_sequence(struct nfs_client *client,
1052                         struct nfs4_sequence_args *args,
1053                         struct nfs4_sequence_res *res,
1054                         struct rpc_task *task)
1055 {
1056         struct nfs4_session *session = nfs4_get_session(client);
1057         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1058         struct nfs4_slot *slot;
1059
1060         /* slot already allocated? */
1061         if (res->sr_slot != NULL)
1062                 goto out_start;
1063
1064         if (session)
1065                 tbl = &session->fc_slot_table;
1066
1067         spin_lock(&tbl->slot_tbl_lock);
1068         /* The state manager will wait until the slot table is empty */
1069         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1070                 goto out_sleep;
1071
1072         slot = nfs4_alloc_slot(tbl);
1073         if (IS_ERR(slot)) {
1074                 if (slot == ERR_PTR(-ENOMEM))
1075                         goto out_sleep_timeout;
1076                 goto out_sleep;
1077         }
1078         spin_unlock(&tbl->slot_tbl_lock);
1079
1080         nfs4_sequence_attach_slot(args, res, slot);
1081
1082         trace_nfs4_setup_sequence(session, args);
1083 out_start:
1084         nfs41_sequence_res_init(res);
1085         rpc_call_start(task);
1086         return 0;
1087 out_sleep_timeout:
1088         /* Try again in 1/4 second */
1089         if (args->sa_privileged)
1090                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1091                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1092         else
1093                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1094                                 NULL, jiffies + (HZ >> 2));
1095         spin_unlock(&tbl->slot_tbl_lock);
1096         return -EAGAIN;
1097 out_sleep:
1098         if (args->sa_privileged)
1099                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1100                                 RPC_PRIORITY_PRIVILEGED);
1101         else
1102                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1103         spin_unlock(&tbl->slot_tbl_lock);
1104         return -EAGAIN;
1105 }
1106 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1107
1108 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1109 {
1110         struct nfs4_call_sync_data *data = calldata;
1111         nfs4_setup_sequence(data->seq_server->nfs_client,
1112                                 data->seq_args, data->seq_res, task);
1113 }
1114
1115 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1116 {
1117         struct nfs4_call_sync_data *data = calldata;
1118         nfs4_sequence_done(task, data->seq_res);
1119 }
1120
1121 static const struct rpc_call_ops nfs40_call_sync_ops = {
1122         .rpc_call_prepare = nfs40_call_sync_prepare,
1123         .rpc_call_done = nfs40_call_sync_done,
1124 };
1125
1126 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1127 {
1128         int ret;
1129         struct rpc_task *task;
1130
1131         task = rpc_run_task(task_setup);
1132         if (IS_ERR(task))
1133                 return PTR_ERR(task);
1134
1135         ret = task->tk_status;
1136         rpc_put_task(task);
1137         return ret;
1138 }
1139
1140 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1141                              struct nfs_server *server,
1142                              struct rpc_message *msg,
1143                              struct nfs4_sequence_args *args,
1144                              struct nfs4_sequence_res *res,
1145                              unsigned short task_flags)
1146 {
1147         struct nfs_client *clp = server->nfs_client;
1148         struct nfs4_call_sync_data data = {
1149                 .seq_server = server,
1150                 .seq_args = args,
1151                 .seq_res = res,
1152         };
1153         struct rpc_task_setup task_setup = {
1154                 .rpc_client = clnt,
1155                 .rpc_message = msg,
1156                 .callback_ops = clp->cl_mvops->call_sync_ops,
1157                 .callback_data = &data,
1158                 .flags = task_flags,
1159         };
1160
1161         return nfs4_call_sync_custom(&task_setup);
1162 }
1163
1164 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1165                                    struct nfs_server *server,
1166                                    struct rpc_message *msg,
1167                                    struct nfs4_sequence_args *args,
1168                                    struct nfs4_sequence_res *res)
1169 {
1170         unsigned short task_flags = 0;
1171
1172         if (server->caps & NFS_CAP_MOVEABLE)
1173                 task_flags = RPC_TASK_MOVEABLE;
1174         return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1175 }
1176
1177
1178 int nfs4_call_sync(struct rpc_clnt *clnt,
1179                    struct nfs_server *server,
1180                    struct rpc_message *msg,
1181                    struct nfs4_sequence_args *args,
1182                    struct nfs4_sequence_res *res,
1183                    int cache_reply)
1184 {
1185         nfs4_init_sequence(args, res, cache_reply, 0);
1186         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1187 }
1188
1189 static void
1190 nfs4_inc_nlink_locked(struct inode *inode)
1191 {
1192         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1193                                              NFS_INO_INVALID_CTIME |
1194                                              NFS_INO_INVALID_NLINK);
1195         inc_nlink(inode);
1196 }
1197
1198 static void
1199 nfs4_inc_nlink(struct inode *inode)
1200 {
1201         spin_lock(&inode->i_lock);
1202         nfs4_inc_nlink_locked(inode);
1203         spin_unlock(&inode->i_lock);
1204 }
1205
1206 static void
1207 nfs4_dec_nlink_locked(struct inode *inode)
1208 {
1209         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1210                                              NFS_INO_INVALID_CTIME |
1211                                              NFS_INO_INVALID_NLINK);
1212         drop_nlink(inode);
1213 }
1214
1215 static void
1216 nfs4_update_changeattr_locked(struct inode *inode,
1217                 struct nfs4_change_info *cinfo,
1218                 unsigned long timestamp, unsigned long cache_validity)
1219 {
1220         struct nfs_inode *nfsi = NFS_I(inode);
1221         u64 change_attr = inode_peek_iversion_raw(inode);
1222
1223         cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1224         if (S_ISDIR(inode->i_mode))
1225                 cache_validity |= NFS_INO_INVALID_DATA;
1226
1227         switch (NFS_SERVER(inode)->change_attr_type) {
1228         case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1229                 if (cinfo->after == change_attr)
1230                         goto out;
1231                 break;
1232         default:
1233                 if ((s64)(change_attr - cinfo->after) >= 0)
1234                         goto out;
1235         }
1236
1237         inode_set_iversion_raw(inode, cinfo->after);
1238         if (!cinfo->atomic || cinfo->before != change_attr) {
1239                 if (S_ISDIR(inode->i_mode))
1240                         nfs_force_lookup_revalidate(inode);
1241
1242                 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1243                         cache_validity |=
1244                                 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1245                                 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1246                                 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1247                                 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1248                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1249         }
1250         nfsi->attrtimeo_timestamp = jiffies;
1251         nfsi->read_cache_jiffies = timestamp;
1252         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1253         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1254 out:
1255         nfs_set_cache_invalid(inode, cache_validity);
1256 }
1257
1258 void
1259 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1260                 unsigned long timestamp, unsigned long cache_validity)
1261 {
1262         spin_lock(&dir->i_lock);
1263         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1264         spin_unlock(&dir->i_lock);
1265 }
1266
1267 struct nfs4_open_createattrs {
1268         struct nfs4_label *label;
1269         struct iattr *sattr;
1270         const __u32 verf[2];
1271 };
1272
1273 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1274                 int err, struct nfs4_exception *exception)
1275 {
1276         if (err != -EINVAL)
1277                 return false;
1278         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1279                 return false;
1280         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1281         exception->retry = 1;
1282         return true;
1283 }
1284
1285 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1286 {
1287          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1288 }
1289
1290 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1291 {
1292         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1293
1294         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1295 }
1296
1297 static u32
1298 nfs4_map_atomic_open_share(struct nfs_server *server,
1299                 fmode_t fmode, int openflags)
1300 {
1301         u32 res = 0;
1302
1303         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1304         case FMODE_READ:
1305                 res = NFS4_SHARE_ACCESS_READ;
1306                 break;
1307         case FMODE_WRITE:
1308                 res = NFS4_SHARE_ACCESS_WRITE;
1309                 break;
1310         case FMODE_READ|FMODE_WRITE:
1311                 res = NFS4_SHARE_ACCESS_BOTH;
1312         }
1313         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1314                 goto out;
1315         /* Want no delegation if we're using O_DIRECT */
1316         if (openflags & O_DIRECT)
1317                 res |= NFS4_SHARE_WANT_NO_DELEG;
1318 out:
1319         return res;
1320 }
1321
1322 static enum open_claim_type4
1323 nfs4_map_atomic_open_claim(struct nfs_server *server,
1324                 enum open_claim_type4 claim)
1325 {
1326         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1327                 return claim;
1328         switch (claim) {
1329         default:
1330                 return claim;
1331         case NFS4_OPEN_CLAIM_FH:
1332                 return NFS4_OPEN_CLAIM_NULL;
1333         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1334                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1335         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1336                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1337         }
1338 }
1339
1340 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1341 {
1342         p->o_res.f_attr = &p->f_attr;
1343         p->o_res.seqid = p->o_arg.seqid;
1344         p->c_res.seqid = p->c_arg.seqid;
1345         p->o_res.server = p->o_arg.server;
1346         p->o_res.access_request = p->o_arg.access;
1347         nfs_fattr_init(&p->f_attr);
1348         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1349 }
1350
1351 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1352                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1353                 const struct nfs4_open_createattrs *c,
1354                 enum open_claim_type4 claim,
1355                 gfp_t gfp_mask)
1356 {
1357         struct dentry *parent = dget_parent(dentry);
1358         struct inode *dir = d_inode(parent);
1359         struct nfs_server *server = NFS_SERVER(dir);
1360         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1361         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1362         struct nfs4_opendata *p;
1363
1364         p = kzalloc(sizeof(*p), gfp_mask);
1365         if (p == NULL)
1366                 goto err;
1367
1368         p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1369         if (IS_ERR(p->f_attr.label))
1370                 goto err_free_p;
1371
1372         p->a_label = nfs4_label_alloc(server, gfp_mask);
1373         if (IS_ERR(p->a_label))
1374                 goto err_free_f;
1375
1376         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1377         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1378         if (IS_ERR(p->o_arg.seqid))
1379                 goto err_free_label;
1380         nfs_sb_active(dentry->d_sb);
1381         p->dentry = dget(dentry);
1382         p->dir = parent;
1383         p->owner = sp;
1384         atomic_inc(&sp->so_count);
1385         p->o_arg.open_flags = flags;
1386         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1387         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1388         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1389                         fmode, flags);
1390         if (flags & O_CREAT) {
1391                 p->o_arg.umask = current_umask();
1392                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1393                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1394                         p->o_arg.u.attrs = &p->attrs;
1395                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1396
1397                         memcpy(p->o_arg.u.verifier.data, c->verf,
1398                                         sizeof(p->o_arg.u.verifier.data));
1399                 }
1400         }
1401         /* ask server to check for all possible rights as results
1402          * are cached */
1403         switch (p->o_arg.claim) {
1404         default:
1405                 break;
1406         case NFS4_OPEN_CLAIM_NULL:
1407         case NFS4_OPEN_CLAIM_FH:
1408                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1409                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1410                                   NFS4_ACCESS_EXECUTE |
1411                                   nfs_access_xattr_mask(server);
1412         }
1413         p->o_arg.clientid = server->nfs_client->cl_clientid;
1414         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1415         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1416         p->o_arg.name = &dentry->d_name;
1417         p->o_arg.server = server;
1418         p->o_arg.bitmask = nfs4_bitmask(server, label);
1419         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1420         switch (p->o_arg.claim) {
1421         case NFS4_OPEN_CLAIM_NULL:
1422         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1423         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1424                 p->o_arg.fh = NFS_FH(dir);
1425                 break;
1426         case NFS4_OPEN_CLAIM_PREVIOUS:
1427         case NFS4_OPEN_CLAIM_FH:
1428         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1429         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1430                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1431         }
1432         p->c_arg.fh = &p->o_res.fh;
1433         p->c_arg.stateid = &p->o_res.stateid;
1434         p->c_arg.seqid = p->o_arg.seqid;
1435         nfs4_init_opendata_res(p);
1436         kref_init(&p->kref);
1437         return p;
1438
1439 err_free_label:
1440         nfs4_label_free(p->a_label);
1441 err_free_f:
1442         nfs4_label_free(p->f_attr.label);
1443 err_free_p:
1444         kfree(p);
1445 err:
1446         dput(parent);
1447         return NULL;
1448 }
1449
1450 static void nfs4_opendata_free(struct kref *kref)
1451 {
1452         struct nfs4_opendata *p = container_of(kref,
1453                         struct nfs4_opendata, kref);
1454         struct super_block *sb = p->dentry->d_sb;
1455
1456         nfs4_lgopen_release(p->lgp);
1457         nfs_free_seqid(p->o_arg.seqid);
1458         nfs4_sequence_free_slot(&p->o_res.seq_res);
1459         if (p->state != NULL)
1460                 nfs4_put_open_state(p->state);
1461         nfs4_put_state_owner(p->owner);
1462
1463         nfs4_label_free(p->a_label);
1464         nfs4_label_free(p->f_attr.label);
1465
1466         dput(p->dir);
1467         dput(p->dentry);
1468         nfs_sb_deactive(sb);
1469         nfs_fattr_free_names(&p->f_attr);
1470         kfree(p->f_attr.mdsthreshold);
1471         kfree(p);
1472 }
1473
1474 static void nfs4_opendata_put(struct nfs4_opendata *p)
1475 {
1476         if (p != NULL)
1477                 kref_put(&p->kref, nfs4_opendata_free);
1478 }
1479
1480 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1481                 fmode_t fmode)
1482 {
1483         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1484         case FMODE_READ|FMODE_WRITE:
1485                 return state->n_rdwr != 0;
1486         case FMODE_WRITE:
1487                 return state->n_wronly != 0;
1488         case FMODE_READ:
1489                 return state->n_rdonly != 0;
1490         }
1491         WARN_ON_ONCE(1);
1492         return false;
1493 }
1494
1495 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1496                 int open_mode, enum open_claim_type4 claim)
1497 {
1498         int ret = 0;
1499
1500         if (open_mode & (O_EXCL|O_TRUNC))
1501                 goto out;
1502         switch (claim) {
1503         case NFS4_OPEN_CLAIM_NULL:
1504         case NFS4_OPEN_CLAIM_FH:
1505                 goto out;
1506         default:
1507                 break;
1508         }
1509         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1510                 case FMODE_READ:
1511                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1512                                 && state->n_rdonly != 0;
1513                         break;
1514                 case FMODE_WRITE:
1515                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1516                                 && state->n_wronly != 0;
1517                         break;
1518                 case FMODE_READ|FMODE_WRITE:
1519                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1520                                 && state->n_rdwr != 0;
1521         }
1522 out:
1523         return ret;
1524 }
1525
1526 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1527                 enum open_claim_type4 claim)
1528 {
1529         if (delegation == NULL)
1530                 return 0;
1531         if ((delegation->type & fmode) != fmode)
1532                 return 0;
1533         switch (claim) {
1534         case NFS4_OPEN_CLAIM_NULL:
1535         case NFS4_OPEN_CLAIM_FH:
1536                 break;
1537         case NFS4_OPEN_CLAIM_PREVIOUS:
1538                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1539                         break;
1540                 fallthrough;
1541         default:
1542                 return 0;
1543         }
1544         nfs_mark_delegation_referenced(delegation);
1545         return 1;
1546 }
1547
1548 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1549 {
1550         switch (fmode) {
1551                 case FMODE_WRITE:
1552                         state->n_wronly++;
1553                         break;
1554                 case FMODE_READ:
1555                         state->n_rdonly++;
1556                         break;
1557                 case FMODE_READ|FMODE_WRITE:
1558                         state->n_rdwr++;
1559         }
1560         nfs4_state_set_mode_locked(state, state->state | fmode);
1561 }
1562
1563 #ifdef CONFIG_NFS_V4_1
1564 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1565 {
1566         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1567                 return true;
1568         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1569                 return true;
1570         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1571                 return true;
1572         return false;
1573 }
1574 #endif /* CONFIG_NFS_V4_1 */
1575
1576 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1577 {
1578         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1579                 wake_up_all(&state->waitq);
1580 }
1581
1582 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1583 {
1584         struct nfs_client *clp = state->owner->so_server->nfs_client;
1585         bool need_recover = false;
1586
1587         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1588                 need_recover = true;
1589         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1590                 need_recover = true;
1591         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1592                 need_recover = true;
1593         if (need_recover)
1594                 nfs4_state_mark_reclaim_nograce(clp, state);
1595 }
1596
1597 /*
1598  * Check for whether or not the caller may update the open stateid
1599  * to the value passed in by stateid.
1600  *
1601  * Note: This function relies heavily on the server implementing
1602  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1603  * correctly.
1604  * i.e. The stateid seqids have to be initialised to 1, and
1605  * are then incremented on every state transition.
1606  */
1607 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1608                 const nfs4_stateid *stateid)
1609 {
1610         if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1611                 /* The common case - we're updating to a new sequence number */
1612                 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1613                         if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1614                                 return true;
1615                         return false;
1616                 }
1617                 /* The server returned a new stateid */
1618         }
1619         /* This is the first OPEN in this generation */
1620         if (stateid->seqid == cpu_to_be32(1))
1621                 return true;
1622         return false;
1623 }
1624
1625 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1626 {
1627         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1628                 return;
1629         if (state->n_wronly)
1630                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1631         if (state->n_rdonly)
1632                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1633         if (state->n_rdwr)
1634                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1635         set_bit(NFS_OPEN_STATE, &state->flags);
1636 }
1637
1638 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1639                 nfs4_stateid *stateid, fmode_t fmode)
1640 {
1641         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1642         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1643         case FMODE_WRITE:
1644                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1645                 break;
1646         case FMODE_READ:
1647                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1648                 break;
1649         case 0:
1650                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1651                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1652                 clear_bit(NFS_OPEN_STATE, &state->flags);
1653         }
1654         if (stateid == NULL)
1655                 return;
1656         /* Handle OPEN+OPEN_DOWNGRADE races */
1657         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1658             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1659                 nfs_resync_open_stateid_locked(state);
1660                 goto out;
1661         }
1662         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1663                 nfs4_stateid_copy(&state->stateid, stateid);
1664         nfs4_stateid_copy(&state->open_stateid, stateid);
1665         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1666 out:
1667         nfs_state_log_update_open_stateid(state);
1668 }
1669
1670 static void nfs_clear_open_stateid(struct nfs4_state *state,
1671         nfs4_stateid *arg_stateid,
1672         nfs4_stateid *stateid, fmode_t fmode)
1673 {
1674         write_seqlock(&state->seqlock);
1675         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1676         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1677                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1678         write_sequnlock(&state->seqlock);
1679         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1680                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1681 }
1682
1683 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1684                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1685         __must_hold(&state->owner->so_lock)
1686         __must_hold(&state->seqlock)
1687         __must_hold(RCU)
1688
1689 {
1690         DEFINE_WAIT(wait);
1691         int status = 0;
1692         for (;;) {
1693
1694                 if (nfs_stateid_is_sequential(state, stateid))
1695                         break;
1696
1697                 if (status)
1698                         break;
1699                 /* Rely on seqids for serialisation with NFSv4.0 */
1700                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1701                         break;
1702
1703                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1704                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1705                 /*
1706                  * Ensure we process the state changes in the same order
1707                  * in which the server processed them by delaying the
1708                  * update of the stateid until we are in sequence.
1709                  */
1710                 write_sequnlock(&state->seqlock);
1711                 spin_unlock(&state->owner->so_lock);
1712                 rcu_read_unlock();
1713                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1714
1715                 if (!fatal_signal_pending(current)) {
1716                         if (schedule_timeout(5*HZ) == 0)
1717                                 status = -EAGAIN;
1718                         else
1719                                 status = 0;
1720                 } else
1721                         status = -EINTR;
1722                 finish_wait(&state->waitq, &wait);
1723                 rcu_read_lock();
1724                 spin_lock(&state->owner->so_lock);
1725                 write_seqlock(&state->seqlock);
1726         }
1727
1728         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1729             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1730                 nfs4_stateid_copy(freeme, &state->open_stateid);
1731                 nfs_test_and_clear_all_open_stateid(state);
1732         }
1733
1734         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1735                 nfs4_stateid_copy(&state->stateid, stateid);
1736         nfs4_stateid_copy(&state->open_stateid, stateid);
1737         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1738         nfs_state_log_update_open_stateid(state);
1739 }
1740
1741 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1742                 const nfs4_stateid *open_stateid,
1743                 fmode_t fmode,
1744                 nfs4_stateid *freeme)
1745 {
1746         /*
1747          * Protect the call to nfs4_state_set_mode_locked and
1748          * serialise the stateid update
1749          */
1750         write_seqlock(&state->seqlock);
1751         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1752         switch (fmode) {
1753         case FMODE_READ:
1754                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1755                 break;
1756         case FMODE_WRITE:
1757                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1758                 break;
1759         case FMODE_READ|FMODE_WRITE:
1760                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1761         }
1762         set_bit(NFS_OPEN_STATE, &state->flags);
1763         write_sequnlock(&state->seqlock);
1764 }
1765
1766 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1767 {
1768         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1769         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1770         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1771         clear_bit(NFS_OPEN_STATE, &state->flags);
1772 }
1773
1774 static void nfs_state_set_delegation(struct nfs4_state *state,
1775                 const nfs4_stateid *deleg_stateid,
1776                 fmode_t fmode)
1777 {
1778         /*
1779          * Protect the call to nfs4_state_set_mode_locked and
1780          * serialise the stateid update
1781          */
1782         write_seqlock(&state->seqlock);
1783         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1784         set_bit(NFS_DELEGATED_STATE, &state->flags);
1785         write_sequnlock(&state->seqlock);
1786 }
1787
1788 static void nfs_state_clear_delegation(struct nfs4_state *state)
1789 {
1790         write_seqlock(&state->seqlock);
1791         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1792         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1793         write_sequnlock(&state->seqlock);
1794 }
1795
1796 int update_open_stateid(struct nfs4_state *state,
1797                 const nfs4_stateid *open_stateid,
1798                 const nfs4_stateid *delegation,
1799                 fmode_t fmode)
1800 {
1801         struct nfs_server *server = NFS_SERVER(state->inode);
1802         struct nfs_client *clp = server->nfs_client;
1803         struct nfs_inode *nfsi = NFS_I(state->inode);
1804         struct nfs_delegation *deleg_cur;
1805         nfs4_stateid freeme = { };
1806         int ret = 0;
1807
1808         fmode &= (FMODE_READ|FMODE_WRITE);
1809
1810         rcu_read_lock();
1811         spin_lock(&state->owner->so_lock);
1812         if (open_stateid != NULL) {
1813                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1814                 ret = 1;
1815         }
1816
1817         deleg_cur = nfs4_get_valid_delegation(state->inode);
1818         if (deleg_cur == NULL)
1819                 goto no_delegation;
1820
1821         spin_lock(&deleg_cur->lock);
1822         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1823            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1824             (deleg_cur->type & fmode) != fmode)
1825                 goto no_delegation_unlock;
1826
1827         if (delegation == NULL)
1828                 delegation = &deleg_cur->stateid;
1829         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1830                 goto no_delegation_unlock;
1831
1832         nfs_mark_delegation_referenced(deleg_cur);
1833         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1834         ret = 1;
1835 no_delegation_unlock:
1836         spin_unlock(&deleg_cur->lock);
1837 no_delegation:
1838         if (ret)
1839                 update_open_stateflags(state, fmode);
1840         spin_unlock(&state->owner->so_lock);
1841         rcu_read_unlock();
1842
1843         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1844                 nfs4_schedule_state_manager(clp);
1845         if (freeme.type != 0)
1846                 nfs4_test_and_free_stateid(server, &freeme,
1847                                 state->owner->so_cred);
1848
1849         return ret;
1850 }
1851
1852 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1853                 const nfs4_stateid *stateid)
1854 {
1855         struct nfs4_state *state = lsp->ls_state;
1856         bool ret = false;
1857
1858         spin_lock(&state->state_lock);
1859         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1860                 goto out_noupdate;
1861         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1862                 goto out_noupdate;
1863         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1864         ret = true;
1865 out_noupdate:
1866         spin_unlock(&state->state_lock);
1867         return ret;
1868 }
1869
1870 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1871 {
1872         struct nfs_delegation *delegation;
1873
1874         fmode &= FMODE_READ|FMODE_WRITE;
1875         rcu_read_lock();
1876         delegation = nfs4_get_valid_delegation(inode);
1877         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1878                 rcu_read_unlock();
1879                 return;
1880         }
1881         rcu_read_unlock();
1882         nfs4_inode_return_delegation(inode);
1883 }
1884
1885 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1886 {
1887         struct nfs4_state *state = opendata->state;
1888         struct nfs_delegation *delegation;
1889         int open_mode = opendata->o_arg.open_flags;
1890         fmode_t fmode = opendata->o_arg.fmode;
1891         enum open_claim_type4 claim = opendata->o_arg.claim;
1892         nfs4_stateid stateid;
1893         int ret = -EAGAIN;
1894
1895         for (;;) {
1896                 spin_lock(&state->owner->so_lock);
1897                 if (can_open_cached(state, fmode, open_mode, claim)) {
1898                         update_open_stateflags(state, fmode);
1899                         spin_unlock(&state->owner->so_lock);
1900                         goto out_return_state;
1901                 }
1902                 spin_unlock(&state->owner->so_lock);
1903                 rcu_read_lock();
1904                 delegation = nfs4_get_valid_delegation(state->inode);
1905                 if (!can_open_delegated(delegation, fmode, claim)) {
1906                         rcu_read_unlock();
1907                         break;
1908                 }
1909                 /* Save the delegation */
1910                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1911                 rcu_read_unlock();
1912                 nfs_release_seqid(opendata->o_arg.seqid);
1913                 if (!opendata->is_recover) {
1914                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1915                         if (ret != 0)
1916                                 goto out;
1917                 }
1918                 ret = -EAGAIN;
1919
1920                 /* Try to update the stateid using the delegation */
1921                 if (update_open_stateid(state, NULL, &stateid, fmode))
1922                         goto out_return_state;
1923         }
1924 out:
1925         return ERR_PTR(ret);
1926 out_return_state:
1927         refcount_inc(&state->count);
1928         return state;
1929 }
1930
1931 static void
1932 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1933 {
1934         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1935         struct nfs_delegation *delegation;
1936         int delegation_flags = 0;
1937
1938         rcu_read_lock();
1939         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1940         if (delegation)
1941                 delegation_flags = delegation->flags;
1942         rcu_read_unlock();
1943         switch (data->o_arg.claim) {
1944         default:
1945                 break;
1946         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1947         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1948                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1949                                    "returning a delegation for "
1950                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1951                                    clp->cl_hostname);
1952                 return;
1953         }
1954         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1955                 nfs_inode_set_delegation(state->inode,
1956                                 data->owner->so_cred,
1957                                 data->o_res.delegation_type,
1958                                 &data->o_res.delegation,
1959                                 data->o_res.pagemod_limit);
1960         else
1961                 nfs_inode_reclaim_delegation(state->inode,
1962                                 data->owner->so_cred,
1963                                 data->o_res.delegation_type,
1964                                 &data->o_res.delegation,
1965                                 data->o_res.pagemod_limit);
1966
1967         if (data->o_res.do_recall)
1968                 nfs_async_inode_return_delegation(state->inode,
1969                                                   &data->o_res.delegation);
1970 }
1971
1972 /*
1973  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1974  * and update the nfs4_state.
1975  */
1976 static struct nfs4_state *
1977 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1978 {
1979         struct inode *inode = data->state->inode;
1980         struct nfs4_state *state = data->state;
1981         int ret;
1982
1983         if (!data->rpc_done) {
1984                 if (data->rpc_status)
1985                         return ERR_PTR(data->rpc_status);
1986                 return nfs4_try_open_cached(data);
1987         }
1988
1989         ret = nfs_refresh_inode(inode, &data->f_attr);
1990         if (ret)
1991                 return ERR_PTR(ret);
1992
1993         if (data->o_res.delegation_type != 0)
1994                 nfs4_opendata_check_deleg(data, state);
1995
1996         if (!update_open_stateid(state, &data->o_res.stateid,
1997                                 NULL, data->o_arg.fmode))
1998                 return ERR_PTR(-EAGAIN);
1999         refcount_inc(&state->count);
2000
2001         return state;
2002 }
2003
2004 static struct inode *
2005 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2006 {
2007         struct inode *inode;
2008
2009         switch (data->o_arg.claim) {
2010         case NFS4_OPEN_CLAIM_NULL:
2011         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2012         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2013                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2014                         return ERR_PTR(-EAGAIN);
2015                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2016                                 &data->f_attr);
2017                 break;
2018         default:
2019                 inode = d_inode(data->dentry);
2020                 ihold(inode);
2021                 nfs_refresh_inode(inode, &data->f_attr);
2022         }
2023         return inode;
2024 }
2025
2026 static struct nfs4_state *
2027 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2028 {
2029         struct nfs4_state *state;
2030         struct inode *inode;
2031
2032         inode = nfs4_opendata_get_inode(data);
2033         if (IS_ERR(inode))
2034                 return ERR_CAST(inode);
2035         if (data->state != NULL && data->state->inode == inode) {
2036                 state = data->state;
2037                 refcount_inc(&state->count);
2038         } else
2039                 state = nfs4_get_open_state(inode, data->owner);
2040         iput(inode);
2041         if (state == NULL)
2042                 state = ERR_PTR(-ENOMEM);
2043         return state;
2044 }
2045
2046 static struct nfs4_state *
2047 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2048 {
2049         struct nfs4_state *state;
2050
2051         if (!data->rpc_done) {
2052                 state = nfs4_try_open_cached(data);
2053                 trace_nfs4_cached_open(data->state);
2054                 goto out;
2055         }
2056
2057         state = nfs4_opendata_find_nfs4_state(data);
2058         if (IS_ERR(state))
2059                 goto out;
2060
2061         if (data->o_res.delegation_type != 0)
2062                 nfs4_opendata_check_deleg(data, state);
2063         if (!update_open_stateid(state, &data->o_res.stateid,
2064                                 NULL, data->o_arg.fmode)) {
2065                 nfs4_put_open_state(state);
2066                 state = ERR_PTR(-EAGAIN);
2067         }
2068 out:
2069         nfs_release_seqid(data->o_arg.seqid);
2070         return state;
2071 }
2072
2073 static struct nfs4_state *
2074 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2075 {
2076         struct nfs4_state *ret;
2077
2078         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2079                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2080         else
2081                 ret = _nfs4_opendata_to_nfs4_state(data);
2082         nfs4_sequence_free_slot(&data->o_res.seq_res);
2083         return ret;
2084 }
2085
2086 static struct nfs_open_context *
2087 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2088 {
2089         struct nfs_inode *nfsi = NFS_I(state->inode);
2090         struct nfs_open_context *ctx;
2091
2092         rcu_read_lock();
2093         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2094                 if (ctx->state != state)
2095                         continue;
2096                 if ((ctx->mode & mode) != mode)
2097                         continue;
2098                 if (!get_nfs_open_context(ctx))
2099                         continue;
2100                 rcu_read_unlock();
2101                 return ctx;
2102         }
2103         rcu_read_unlock();
2104         return ERR_PTR(-ENOENT);
2105 }
2106
2107 static struct nfs_open_context *
2108 nfs4_state_find_open_context(struct nfs4_state *state)
2109 {
2110         struct nfs_open_context *ctx;
2111
2112         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2113         if (!IS_ERR(ctx))
2114                 return ctx;
2115         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2116         if (!IS_ERR(ctx))
2117                 return ctx;
2118         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2119 }
2120
2121 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2122                 struct nfs4_state *state, enum open_claim_type4 claim)
2123 {
2124         struct nfs4_opendata *opendata;
2125
2126         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2127                         NULL, claim, GFP_NOFS);
2128         if (opendata == NULL)
2129                 return ERR_PTR(-ENOMEM);
2130         opendata->state = state;
2131         refcount_inc(&state->count);
2132         return opendata;
2133 }
2134
2135 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2136                                     fmode_t fmode)
2137 {
2138         struct nfs4_state *newstate;
2139         struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2140         int openflags = opendata->o_arg.open_flags;
2141         int ret;
2142
2143         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2144                 return 0;
2145         opendata->o_arg.fmode = fmode;
2146         opendata->o_arg.share_access =
2147                 nfs4_map_atomic_open_share(server, fmode, openflags);
2148         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2149         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2150         nfs4_init_opendata_res(opendata);
2151         ret = _nfs4_recover_proc_open(opendata);
2152         if (ret != 0)
2153                 return ret;
2154         newstate = nfs4_opendata_to_nfs4_state(opendata);
2155         if (IS_ERR(newstate))
2156                 return PTR_ERR(newstate);
2157         if (newstate != opendata->state)
2158                 ret = -ESTALE;
2159         nfs4_close_state(newstate, fmode);
2160         return ret;
2161 }
2162
2163 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2164 {
2165         int ret;
2166
2167         /* memory barrier prior to reading state->n_* */
2168         smp_rmb();
2169         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2170         if (ret != 0)
2171                 return ret;
2172         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2173         if (ret != 0)
2174                 return ret;
2175         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2176         if (ret != 0)
2177                 return ret;
2178         /*
2179          * We may have performed cached opens for all three recoveries.
2180          * Check if we need to update the current stateid.
2181          */
2182         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2183             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2184                 write_seqlock(&state->seqlock);
2185                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2186                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2187                 write_sequnlock(&state->seqlock);
2188         }
2189         return 0;
2190 }
2191
2192 /*
2193  * OPEN_RECLAIM:
2194  *      reclaim state on the server after a reboot.
2195  */
2196 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2197 {
2198         struct nfs_delegation *delegation;
2199         struct nfs4_opendata *opendata;
2200         fmode_t delegation_type = 0;
2201         int status;
2202
2203         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2204                         NFS4_OPEN_CLAIM_PREVIOUS);
2205         if (IS_ERR(opendata))
2206                 return PTR_ERR(opendata);
2207         rcu_read_lock();
2208         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2209         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2210                 delegation_type = delegation->type;
2211         rcu_read_unlock();
2212         opendata->o_arg.u.delegation_type = delegation_type;
2213         status = nfs4_open_recover(opendata, state);
2214         nfs4_opendata_put(opendata);
2215         return status;
2216 }
2217
2218 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2219 {
2220         struct nfs_server *server = NFS_SERVER(state->inode);
2221         struct nfs4_exception exception = { };
2222         int err;
2223         do {
2224                 err = _nfs4_do_open_reclaim(ctx, state);
2225                 trace_nfs4_open_reclaim(ctx, 0, err);
2226                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2227                         continue;
2228                 if (err != -NFS4ERR_DELAY)
2229                         break;
2230                 nfs4_handle_exception(server, err, &exception);
2231         } while (exception.retry);
2232         return err;
2233 }
2234
2235 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2236 {
2237         struct nfs_open_context *ctx;
2238         int ret;
2239
2240         ctx = nfs4_state_find_open_context(state);
2241         if (IS_ERR(ctx))
2242                 return -EAGAIN;
2243         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2244         nfs_state_clear_open_state_flags(state);
2245         ret = nfs4_do_open_reclaim(ctx, state);
2246         put_nfs_open_context(ctx);
2247         return ret;
2248 }
2249
2250 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2251 {
2252         switch (err) {
2253                 default:
2254                         printk(KERN_ERR "NFS: %s: unhandled error "
2255                                         "%d.\n", __func__, err);
2256                         fallthrough;
2257                 case 0:
2258                 case -ENOENT:
2259                 case -EAGAIN:
2260                 case -ESTALE:
2261                 case -ETIMEDOUT:
2262                         break;
2263                 case -NFS4ERR_BADSESSION:
2264                 case -NFS4ERR_BADSLOT:
2265                 case -NFS4ERR_BAD_HIGH_SLOT:
2266                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2267                 case -NFS4ERR_DEADSESSION:
2268                         return -EAGAIN;
2269                 case -NFS4ERR_STALE_CLIENTID:
2270                 case -NFS4ERR_STALE_STATEID:
2271                         /* Don't recall a delegation if it was lost */
2272                         nfs4_schedule_lease_recovery(server->nfs_client);
2273                         return -EAGAIN;
2274                 case -NFS4ERR_MOVED:
2275                         nfs4_schedule_migration_recovery(server);
2276                         return -EAGAIN;
2277                 case -NFS4ERR_LEASE_MOVED:
2278                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2279                         return -EAGAIN;
2280                 case -NFS4ERR_DELEG_REVOKED:
2281                 case -NFS4ERR_ADMIN_REVOKED:
2282                 case -NFS4ERR_EXPIRED:
2283                 case -NFS4ERR_BAD_STATEID:
2284                 case -NFS4ERR_OPENMODE:
2285                         nfs_inode_find_state_and_recover(state->inode,
2286                                         stateid);
2287                         nfs4_schedule_stateid_recovery(server, state);
2288                         return -EAGAIN;
2289                 case -NFS4ERR_DELAY:
2290                 case -NFS4ERR_GRACE:
2291                         ssleep(1);
2292                         return -EAGAIN;
2293                 case -ENOMEM:
2294                 case -NFS4ERR_DENIED:
2295                         if (fl) {
2296                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2297                                 if (lsp)
2298                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2299                         }
2300                         return 0;
2301         }
2302         return err;
2303 }
2304
2305 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2306                 struct nfs4_state *state, const nfs4_stateid *stateid)
2307 {
2308         struct nfs_server *server = NFS_SERVER(state->inode);
2309         struct nfs4_opendata *opendata;
2310         int err = 0;
2311
2312         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2313                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2314         if (IS_ERR(opendata))
2315                 return PTR_ERR(opendata);
2316         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2317         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2318                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2319                 if (err)
2320                         goto out;
2321         }
2322         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2323                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2324                 if (err)
2325                         goto out;
2326         }
2327         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2328                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2329                 if (err)
2330                         goto out;
2331         }
2332         nfs_state_clear_delegation(state);
2333 out:
2334         nfs4_opendata_put(opendata);
2335         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2336 }
2337
2338 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2339 {
2340         struct nfs4_opendata *data = calldata;
2341
2342         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2343                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2344 }
2345
2346 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2347 {
2348         struct nfs4_opendata *data = calldata;
2349
2350         nfs40_sequence_done(task, &data->c_res.seq_res);
2351
2352         data->rpc_status = task->tk_status;
2353         if (data->rpc_status == 0) {
2354                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2355                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2356                 renew_lease(data->o_res.server, data->timestamp);
2357                 data->rpc_done = true;
2358         }
2359 }
2360
2361 static void nfs4_open_confirm_release(void *calldata)
2362 {
2363         struct nfs4_opendata *data = calldata;
2364         struct nfs4_state *state = NULL;
2365
2366         /* If this request hasn't been cancelled, do nothing */
2367         if (!data->cancelled)
2368                 goto out_free;
2369         /* In case of error, no cleanup! */
2370         if (!data->rpc_done)
2371                 goto out_free;
2372         state = nfs4_opendata_to_nfs4_state(data);
2373         if (!IS_ERR(state))
2374                 nfs4_close_state(state, data->o_arg.fmode);
2375 out_free:
2376         nfs4_opendata_put(data);
2377 }
2378
2379 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2380         .rpc_call_prepare = nfs4_open_confirm_prepare,
2381         .rpc_call_done = nfs4_open_confirm_done,
2382         .rpc_release = nfs4_open_confirm_release,
2383 };
2384
2385 /*
2386  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2387  */
2388 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2389 {
2390         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2391         struct rpc_task *task;
2392         struct  rpc_message msg = {
2393                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2394                 .rpc_argp = &data->c_arg,
2395                 .rpc_resp = &data->c_res,
2396                 .rpc_cred = data->owner->so_cred,
2397         };
2398         struct rpc_task_setup task_setup_data = {
2399                 .rpc_client = server->client,
2400                 .rpc_message = &msg,
2401                 .callback_ops = &nfs4_open_confirm_ops,
2402                 .callback_data = data,
2403                 .workqueue = nfsiod_workqueue,
2404                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2405         };
2406         int status;
2407
2408         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2409                                 data->is_recover);
2410         kref_get(&data->kref);
2411         data->rpc_done = false;
2412         data->rpc_status = 0;
2413         data->timestamp = jiffies;
2414         task = rpc_run_task(&task_setup_data);
2415         if (IS_ERR(task))
2416                 return PTR_ERR(task);
2417         status = rpc_wait_for_completion_task(task);
2418         if (status != 0) {
2419                 data->cancelled = true;
2420                 smp_wmb();
2421         } else
2422                 status = data->rpc_status;
2423         rpc_put_task(task);
2424         return status;
2425 }
2426
2427 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2428 {
2429         struct nfs4_opendata *data = calldata;
2430         struct nfs4_state_owner *sp = data->owner;
2431         struct nfs_client *clp = sp->so_server->nfs_client;
2432         enum open_claim_type4 claim = data->o_arg.claim;
2433
2434         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2435                 goto out_wait;
2436         /*
2437          * Check if we still need to send an OPEN call, or if we can use
2438          * a delegation instead.
2439          */
2440         if (data->state != NULL) {
2441                 struct nfs_delegation *delegation;
2442
2443                 if (can_open_cached(data->state, data->o_arg.fmode,
2444                                         data->o_arg.open_flags, claim))
2445                         goto out_no_action;
2446                 rcu_read_lock();
2447                 delegation = nfs4_get_valid_delegation(data->state->inode);
2448                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2449                         goto unlock_no_action;
2450                 rcu_read_unlock();
2451         }
2452         /* Update client id. */
2453         data->o_arg.clientid = clp->cl_clientid;
2454         switch (claim) {
2455         default:
2456                 break;
2457         case NFS4_OPEN_CLAIM_PREVIOUS:
2458         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2459         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2460                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2461                 fallthrough;
2462         case NFS4_OPEN_CLAIM_FH:
2463                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2464         }
2465         data->timestamp = jiffies;
2466         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2467                                 &data->o_arg.seq_args,
2468                                 &data->o_res.seq_res,
2469                                 task) != 0)
2470                 nfs_release_seqid(data->o_arg.seqid);
2471
2472         /* Set the create mode (note dependency on the session type) */
2473         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2474         if (data->o_arg.open_flags & O_EXCL) {
2475                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2476                 if (clp->cl_mvops->minor_version == 0) {
2477                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2478                         /* don't put an ACCESS op in OPEN compound if O_EXCL,
2479                          * because ACCESS will return permission denied for
2480                          * all bits until close */
2481                         data->o_res.access_request = data->o_arg.access = 0;
2482                 } else if (nfs4_has_persistent_session(clp))
2483                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2484         }
2485         return;
2486 unlock_no_action:
2487         trace_nfs4_cached_open(data->state);
2488         rcu_read_unlock();
2489 out_no_action:
2490         task->tk_action = NULL;
2491 out_wait:
2492         nfs4_sequence_done(task, &data->o_res.seq_res);
2493 }
2494
2495 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2496 {
2497         struct nfs4_opendata *data = calldata;
2498
2499         data->rpc_status = task->tk_status;
2500
2501         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2502                 return;
2503
2504         if (task->tk_status == 0) {
2505                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2506                         switch (data->o_res.f_attr->mode & S_IFMT) {
2507                         case S_IFREG:
2508                                 break;
2509                         case S_IFLNK:
2510                                 data->rpc_status = -ELOOP;
2511                                 break;
2512                         case S_IFDIR:
2513                                 data->rpc_status = -EISDIR;
2514                                 break;
2515                         default:
2516                                 data->rpc_status = -ENOTDIR;
2517                         }
2518                 }
2519                 renew_lease(data->o_res.server, data->timestamp);
2520                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2521                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2522         }
2523         data->rpc_done = true;
2524 }
2525
2526 static void nfs4_open_release(void *calldata)
2527 {
2528         struct nfs4_opendata *data = calldata;
2529         struct nfs4_state *state = NULL;
2530
2531         /* If this request hasn't been cancelled, do nothing */
2532         if (!data->cancelled)
2533                 goto out_free;
2534         /* In case of error, no cleanup! */
2535         if (data->rpc_status != 0 || !data->rpc_done)
2536                 goto out_free;
2537         /* In case we need an open_confirm, no cleanup! */
2538         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2539                 goto out_free;
2540         state = nfs4_opendata_to_nfs4_state(data);
2541         if (!IS_ERR(state))
2542                 nfs4_close_state(state, data->o_arg.fmode);
2543 out_free:
2544         nfs4_opendata_put(data);
2545 }
2546
2547 static const struct rpc_call_ops nfs4_open_ops = {
2548         .rpc_call_prepare = nfs4_open_prepare,
2549         .rpc_call_done = nfs4_open_done,
2550         .rpc_release = nfs4_open_release,
2551 };
2552
2553 static int nfs4_run_open_task(struct nfs4_opendata *data,
2554                               struct nfs_open_context *ctx)
2555 {
2556         struct inode *dir = d_inode(data->dir);
2557         struct nfs_server *server = NFS_SERVER(dir);
2558         struct nfs_openargs *o_arg = &data->o_arg;
2559         struct nfs_openres *o_res = &data->o_res;
2560         struct rpc_task *task;
2561         struct rpc_message msg = {
2562                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2563                 .rpc_argp = o_arg,
2564                 .rpc_resp = o_res,
2565                 .rpc_cred = data->owner->so_cred,
2566         };
2567         struct rpc_task_setup task_setup_data = {
2568                 .rpc_client = server->client,
2569                 .rpc_message = &msg,
2570                 .callback_ops = &nfs4_open_ops,
2571                 .callback_data = data,
2572                 .workqueue = nfsiod_workqueue,
2573                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2574         };
2575         int status;
2576
2577         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2578                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2579
2580         kref_get(&data->kref);
2581         data->rpc_done = false;
2582         data->rpc_status = 0;
2583         data->cancelled = false;
2584         data->is_recover = false;
2585         if (!ctx) {
2586                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2587                 data->is_recover = true;
2588                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2589         } else {
2590                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2591                 pnfs_lgopen_prepare(data, ctx);
2592         }
2593         task = rpc_run_task(&task_setup_data);
2594         if (IS_ERR(task))
2595                 return PTR_ERR(task);
2596         status = rpc_wait_for_completion_task(task);
2597         if (status != 0) {
2598                 data->cancelled = true;
2599                 smp_wmb();
2600         } else
2601                 status = data->rpc_status;
2602         rpc_put_task(task);
2603
2604         return status;
2605 }
2606
2607 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2608 {
2609         struct inode *dir = d_inode(data->dir);
2610         struct nfs_openres *o_res = &data->o_res;
2611         int status;
2612
2613         status = nfs4_run_open_task(data, NULL);
2614         if (status != 0 || !data->rpc_done)
2615                 return status;
2616
2617         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2618
2619         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2620                 status = _nfs4_proc_open_confirm(data);
2621
2622         return status;
2623 }
2624
2625 /*
2626  * Additional permission checks in order to distinguish between an
2627  * open for read, and an open for execute. This works around the
2628  * fact that NFSv4 OPEN treats read and execute permissions as being
2629  * the same.
2630  * Note that in the non-execute case, we want to turn off permission
2631  * checking if we just created a new file (POSIX open() semantics).
2632  */
2633 static int nfs4_opendata_access(const struct cred *cred,
2634                                 struct nfs4_opendata *opendata,
2635                                 struct nfs4_state *state, fmode_t fmode)
2636 {
2637         struct nfs_access_entry cache;
2638         u32 mask, flags;
2639
2640         /* access call failed or for some reason the server doesn't
2641          * support any access modes -- defer access call until later */
2642         if (opendata->o_res.access_supported == 0)
2643                 return 0;
2644
2645         mask = 0;
2646         if (fmode & FMODE_EXEC) {
2647                 /* ONLY check for exec rights */
2648                 if (S_ISDIR(state->inode->i_mode))
2649                         mask = NFS4_ACCESS_LOOKUP;
2650                 else
2651                         mask = NFS4_ACCESS_EXECUTE;
2652         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2653                 mask = NFS4_ACCESS_READ;
2654
2655         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2656         nfs_access_add_cache(state->inode, &cache, cred);
2657
2658         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2659         if ((mask & ~cache.mask & flags) == 0)
2660                 return 0;
2661
2662         return -EACCES;
2663 }
2664
2665 /*
2666  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2667  */
2668 static int _nfs4_proc_open(struct nfs4_opendata *data,
2669                            struct nfs_open_context *ctx)
2670 {
2671         struct inode *dir = d_inode(data->dir);
2672         struct nfs_server *server = NFS_SERVER(dir);
2673         struct nfs_openargs *o_arg = &data->o_arg;
2674         struct nfs_openres *o_res = &data->o_res;
2675         int status;
2676
2677         status = nfs4_run_open_task(data, ctx);
2678         if (!data->rpc_done)
2679                 return status;
2680         if (status != 0) {
2681                 if (status == -NFS4ERR_BADNAME &&
2682                                 !(o_arg->open_flags & O_CREAT))
2683                         return -ENOENT;
2684                 return status;
2685         }
2686
2687         nfs_fattr_map_and_free_names(server, &data->f_attr);
2688
2689         if (o_arg->open_flags & O_CREAT) {
2690                 if (o_arg->open_flags & O_EXCL)
2691                         data->file_created = true;
2692                 else if (o_res->cinfo.before != o_res->cinfo.after)
2693                         data->file_created = true;
2694                 if (data->file_created ||
2695                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2696                         nfs4_update_changeattr(dir, &o_res->cinfo,
2697                                         o_res->f_attr->time_start,
2698                                         NFS_INO_INVALID_DATA);
2699         }
2700         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2701                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2702         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2703                 status = _nfs4_proc_open_confirm(data);
2704                 if (status != 0)
2705                         return status;
2706         }
2707         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2708                 struct nfs_fh *fh = &o_res->fh;
2709
2710                 nfs4_sequence_free_slot(&o_res->seq_res);
2711                 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2712                         fh = NFS_FH(d_inode(data->dentry));
2713                 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2714         }
2715         return 0;
2716 }
2717
2718 /*
2719  * OPEN_EXPIRED:
2720  *      reclaim state on the server after a network partition.
2721  *      Assumes caller holds the appropriate lock
2722  */
2723 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2724 {
2725         struct nfs4_opendata *opendata;
2726         int ret;
2727
2728         opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2729         if (IS_ERR(opendata))
2730                 return PTR_ERR(opendata);
2731         /*
2732          * We're not recovering a delegation, so ask for no delegation.
2733          * Otherwise the recovery thread could deadlock with an outstanding
2734          * delegation return.
2735          */
2736         opendata->o_arg.open_flags = O_DIRECT;
2737         ret = nfs4_open_recover(opendata, state);
2738         if (ret == -ESTALE)
2739                 d_drop(ctx->dentry);
2740         nfs4_opendata_put(opendata);
2741         return ret;
2742 }
2743
2744 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2745 {
2746         struct nfs_server *server = NFS_SERVER(state->inode);
2747         struct nfs4_exception exception = { };
2748         int err;
2749
2750         do {
2751                 err = _nfs4_open_expired(ctx, state);
2752                 trace_nfs4_open_expired(ctx, 0, err);
2753                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2754                         continue;
2755                 switch (err) {
2756                 default:
2757                         goto out;
2758                 case -NFS4ERR_GRACE:
2759                 case -NFS4ERR_DELAY:
2760                         nfs4_handle_exception(server, err, &exception);
2761                         err = 0;
2762                 }
2763         } while (exception.retry);
2764 out:
2765         return err;
2766 }
2767
2768 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2769 {
2770         struct nfs_open_context *ctx;
2771         int ret;
2772
2773         ctx = nfs4_state_find_open_context(state);
2774         if (IS_ERR(ctx))
2775                 return -EAGAIN;
2776         ret = nfs4_do_open_expired(ctx, state);
2777         put_nfs_open_context(ctx);
2778         return ret;
2779 }
2780
2781 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2782                 const nfs4_stateid *stateid)
2783 {
2784         nfs_remove_bad_delegation(state->inode, stateid);
2785         nfs_state_clear_delegation(state);
2786 }
2787
2788 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2789 {
2790         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2791                 nfs_finish_clear_delegation_stateid(state, NULL);
2792 }
2793
2794 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2795 {
2796         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2797         nfs40_clear_delegation_stateid(state);
2798         nfs_state_clear_open_state_flags(state);
2799         return nfs4_open_expired(sp, state);
2800 }
2801
2802 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2803                 nfs4_stateid *stateid,
2804                 const struct cred *cred)
2805 {
2806         return -NFS4ERR_BAD_STATEID;
2807 }
2808
2809 #if defined(CONFIG_NFS_V4_1)
2810 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2811                 nfs4_stateid *stateid,
2812                 const struct cred *cred)
2813 {
2814         int status;
2815
2816         switch (stateid->type) {
2817         default:
2818                 break;
2819         case NFS4_INVALID_STATEID_TYPE:
2820         case NFS4_SPECIAL_STATEID_TYPE:
2821                 return -NFS4ERR_BAD_STATEID;
2822         case NFS4_REVOKED_STATEID_TYPE:
2823                 goto out_free;
2824         }
2825
2826         status = nfs41_test_stateid(server, stateid, cred);
2827         switch (status) {
2828         case -NFS4ERR_EXPIRED:
2829         case -NFS4ERR_ADMIN_REVOKED:
2830         case -NFS4ERR_DELEG_REVOKED:
2831                 break;
2832         default:
2833                 return status;
2834         }
2835 out_free:
2836         /* Ack the revoked state to the server */
2837         nfs41_free_stateid(server, stateid, cred, true);
2838         return -NFS4ERR_EXPIRED;
2839 }
2840
2841 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2842 {
2843         struct nfs_server *server = NFS_SERVER(state->inode);
2844         nfs4_stateid stateid;
2845         struct nfs_delegation *delegation;
2846         const struct cred *cred = NULL;
2847         int status, ret = NFS_OK;
2848
2849         /* Get the delegation credential for use by test/free_stateid */
2850         rcu_read_lock();
2851         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2852         if (delegation == NULL) {
2853                 rcu_read_unlock();
2854                 nfs_state_clear_delegation(state);
2855                 return NFS_OK;
2856         }
2857
2858         spin_lock(&delegation->lock);
2859         nfs4_stateid_copy(&stateid, &delegation->stateid);
2860
2861         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2862                                 &delegation->flags)) {
2863                 spin_unlock(&delegation->lock);
2864                 rcu_read_unlock();
2865                 return NFS_OK;
2866         }
2867
2868         if (delegation->cred)
2869                 cred = get_cred(delegation->cred);
2870         spin_unlock(&delegation->lock);
2871         rcu_read_unlock();
2872         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2873         trace_nfs4_test_delegation_stateid(state, NULL, status);
2874         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2875                 nfs_finish_clear_delegation_stateid(state, &stateid);
2876         else
2877                 ret = status;
2878
2879         put_cred(cred);
2880         return ret;
2881 }
2882
2883 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2884 {
2885         nfs4_stateid tmp;
2886
2887         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2888             nfs4_copy_delegation_stateid(state->inode, state->state,
2889                                 &tmp, NULL) &&
2890             nfs4_stateid_match_other(&state->stateid, &tmp))
2891                 nfs_state_set_delegation(state, &tmp, state->state);
2892         else
2893                 nfs_state_clear_delegation(state);
2894 }
2895
2896 /**
2897  * nfs41_check_expired_locks - possibly free a lock stateid
2898  *
2899  * @state: NFSv4 state for an inode
2900  *
2901  * Returns NFS_OK if recovery for this stateid is now finished.
2902  * Otherwise a negative NFS4ERR value is returned.
2903  */
2904 static int nfs41_check_expired_locks(struct nfs4_state *state)
2905 {
2906         int status, ret = NFS_OK;
2907         struct nfs4_lock_state *lsp, *prev = NULL;
2908         struct nfs_server *server = NFS_SERVER(state->inode);
2909
2910         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2911                 goto out;
2912
2913         spin_lock(&state->state_lock);
2914         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2915                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2916                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2917
2918                         refcount_inc(&lsp->ls_count);
2919                         spin_unlock(&state->state_lock);
2920
2921                         nfs4_put_lock_state(prev);
2922                         prev = lsp;
2923
2924                         status = nfs41_test_and_free_expired_stateid(server,
2925                                         &lsp->ls_stateid,
2926                                         cred);
2927                         trace_nfs4_test_lock_stateid(state, lsp, status);
2928                         if (status == -NFS4ERR_EXPIRED ||
2929                             status == -NFS4ERR_BAD_STATEID) {
2930                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2931                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2932                                 if (!recover_lost_locks)
2933                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2934                         } else if (status != NFS_OK) {
2935                                 ret = status;
2936                                 nfs4_put_lock_state(prev);
2937                                 goto out;
2938                         }
2939                         spin_lock(&state->state_lock);
2940                 }
2941         }
2942         spin_unlock(&state->state_lock);
2943         nfs4_put_lock_state(prev);
2944 out:
2945         return ret;
2946 }
2947
2948 /**
2949  * nfs41_check_open_stateid - possibly free an open stateid
2950  *
2951  * @state: NFSv4 state for an inode
2952  *
2953  * Returns NFS_OK if recovery for this stateid is now finished.
2954  * Otherwise a negative NFS4ERR value is returned.
2955  */
2956 static int nfs41_check_open_stateid(struct nfs4_state *state)
2957 {
2958         struct nfs_server *server = NFS_SERVER(state->inode);
2959         nfs4_stateid *stateid = &state->open_stateid;
2960         const struct cred *cred = state->owner->so_cred;
2961         int status;
2962
2963         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2964                 return -NFS4ERR_BAD_STATEID;
2965         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2966         trace_nfs4_test_open_stateid(state, NULL, status);
2967         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2968                 nfs_state_clear_open_state_flags(state);
2969                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2970                 return status;
2971         }
2972         if (nfs_open_stateid_recover_openmode(state))
2973                 return -NFS4ERR_OPENMODE;
2974         return NFS_OK;
2975 }
2976
2977 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2978 {
2979         int status;
2980
2981         status = nfs41_check_delegation_stateid(state);
2982         if (status != NFS_OK)
2983                 return status;
2984         nfs41_delegation_recover_stateid(state);
2985
2986         status = nfs41_check_expired_locks(state);
2987         if (status != NFS_OK)
2988                 return status;
2989         status = nfs41_check_open_stateid(state);
2990         if (status != NFS_OK)
2991                 status = nfs4_open_expired(sp, state);
2992         return status;
2993 }
2994 #endif
2995
2996 /*
2997  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2998  * fields corresponding to attributes that were used to store the verifier.
2999  * Make sure we clobber those fields in the later setattr call
3000  */
3001 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3002                                 struct iattr *sattr, struct nfs4_label **label)
3003 {
3004         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3005         __u32 attrset[3];
3006         unsigned ret;
3007         unsigned i;
3008
3009         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3010                 attrset[i] = opendata->o_res.attrset[i];
3011                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3012                         attrset[i] &= ~bitmask[i];
3013         }
3014
3015         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3016                 sattr->ia_valid : 0;
3017
3018         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3019                 if (sattr->ia_valid & ATTR_ATIME_SET)
3020                         ret |= ATTR_ATIME_SET;
3021                 else
3022                         ret |= ATTR_ATIME;
3023         }
3024
3025         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3026                 if (sattr->ia_valid & ATTR_MTIME_SET)
3027                         ret |= ATTR_MTIME_SET;
3028                 else
3029                         ret |= ATTR_MTIME;
3030         }
3031
3032         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3033                 *label = NULL;
3034         return ret;
3035 }
3036
3037 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3038                 struct nfs_open_context *ctx)
3039 {
3040         struct nfs4_state_owner *sp = opendata->owner;
3041         struct nfs_server *server = sp->so_server;
3042         struct dentry *dentry;
3043         struct nfs4_state *state;
3044         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3045         struct inode *dir = d_inode(opendata->dir);
3046         unsigned long dir_verifier;
3047         unsigned int seq;
3048         int ret;
3049
3050         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3051         dir_verifier = nfs_save_change_attribute(dir);
3052
3053         ret = _nfs4_proc_open(opendata, ctx);
3054         if (ret != 0)
3055                 goto out;
3056
3057         state = _nfs4_opendata_to_nfs4_state(opendata);
3058         ret = PTR_ERR(state);
3059         if (IS_ERR(state))
3060                 goto out;
3061         ctx->state = state;
3062         if (server->caps & NFS_CAP_POSIX_LOCK)
3063                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3064         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3065                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3066         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3067                 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3068
3069         dentry = opendata->dentry;
3070         if (d_really_is_negative(dentry)) {
3071                 struct dentry *alias;
3072                 d_drop(dentry);
3073                 alias = d_exact_alias(dentry, state->inode);
3074                 if (!alias)
3075                         alias = d_splice_alias(igrab(state->inode), dentry);
3076                 /* d_splice_alias() can't fail here - it's a non-directory */
3077                 if (alias) {
3078                         dput(ctx->dentry);
3079                         ctx->dentry = dentry = alias;
3080                 }
3081         }
3082
3083         switch(opendata->o_arg.claim) {
3084         default:
3085                 break;
3086         case NFS4_OPEN_CLAIM_NULL:
3087         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3088         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3089                 if (!opendata->rpc_done)
3090                         break;
3091                 if (opendata->o_res.delegation_type != 0)
3092                         dir_verifier = nfs_save_change_attribute(dir);
3093                 nfs_set_verifier(dentry, dir_verifier);
3094         }
3095
3096         /* Parse layoutget results before we check for access */
3097         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3098
3099         ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3100         if (ret != 0)
3101                 goto out;
3102
3103         if (d_inode(dentry) == state->inode) {
3104                 nfs_inode_attach_open_context(ctx);
3105                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3106                         nfs4_schedule_stateid_recovery(server, state);
3107         }
3108
3109 out:
3110         if (!opendata->cancelled) {
3111                 if (opendata->lgp) {
3112                         nfs4_lgopen_release(opendata->lgp);
3113                         opendata->lgp = NULL;
3114                 }
3115                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3116         }
3117         return ret;
3118 }
3119
3120 /*
3121  * Returns a referenced nfs4_state
3122  */
3123 static int _nfs4_do_open(struct inode *dir,
3124                         struct nfs_open_context *ctx,
3125                         int flags,
3126                         const struct nfs4_open_createattrs *c,
3127                         int *opened)
3128 {
3129         struct nfs4_state_owner  *sp;
3130         struct nfs4_state     *state = NULL;
3131         struct nfs_server       *server = NFS_SERVER(dir);
3132         struct nfs4_opendata *opendata;
3133         struct dentry *dentry = ctx->dentry;
3134         const struct cred *cred = ctx->cred;
3135         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3136         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3137         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3138         struct iattr *sattr = c->sattr;
3139         struct nfs4_label *label = c->label;
3140         int status;
3141
3142         /* Protect against reboot recovery conflicts */
3143         status = -ENOMEM;
3144         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3145         if (sp == NULL) {
3146                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3147                 goto out_err;
3148         }
3149         status = nfs4_client_recover_expired_lease(server->nfs_client);
3150         if (status != 0)
3151                 goto err_put_state_owner;
3152         if (d_really_is_positive(dentry))
3153                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3154         status = -ENOMEM;
3155         if (d_really_is_positive(dentry))
3156                 claim = NFS4_OPEN_CLAIM_FH;
3157         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3158                         c, claim, GFP_KERNEL);
3159         if (opendata == NULL)
3160                 goto err_put_state_owner;
3161
3162         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3163                 if (!opendata->f_attr.mdsthreshold) {
3164                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3165                         if (!opendata->f_attr.mdsthreshold)
3166                                 goto err_opendata_put;
3167                 }
3168                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3169         }
3170         if (d_really_is_positive(dentry))
3171                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3172
3173         status = _nfs4_open_and_get_state(opendata, ctx);
3174         if (status != 0)
3175                 goto err_opendata_put;
3176         state = ctx->state;
3177
3178         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3179             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3180                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3181                 /*
3182                  * send create attributes which was not set by open
3183                  * with an extra setattr.
3184                  */
3185                 if (attrs || label) {
3186                         unsigned ia_old = sattr->ia_valid;
3187
3188                         sattr->ia_valid = attrs;
3189                         nfs_fattr_init(opendata->o_res.f_attr);
3190                         status = nfs4_do_setattr(state->inode, cred,
3191                                         opendata->o_res.f_attr, sattr,
3192                                         ctx, label);
3193                         if (status == 0) {
3194                                 nfs_setattr_update_inode(state->inode, sattr,
3195                                                 opendata->o_res.f_attr);
3196                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3197                         }
3198                         sattr->ia_valid = ia_old;
3199                 }
3200         }
3201         if (opened && opendata->file_created)
3202                 *opened = 1;
3203
3204         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3205                 *ctx_th = opendata->f_attr.mdsthreshold;
3206                 opendata->f_attr.mdsthreshold = NULL;
3207         }
3208
3209         nfs4_opendata_put(opendata);
3210         nfs4_put_state_owner(sp);
3211         return 0;
3212 err_opendata_put:
3213         nfs4_opendata_put(opendata);
3214 err_put_state_owner:
3215         nfs4_put_state_owner(sp);
3216 out_err:
3217         return status;
3218 }
3219
3220
3221 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3222                                         struct nfs_open_context *ctx,
3223                                         int flags,
3224                                         struct iattr *sattr,
3225                                         struct nfs4_label *label,
3226                                         int *opened)
3227 {
3228         struct nfs_server *server = NFS_SERVER(dir);
3229         struct nfs4_exception exception = {
3230                 .interruptible = true,
3231         };
3232         struct nfs4_state *res;
3233         struct nfs4_open_createattrs c = {
3234                 .label = label,
3235                 .sattr = sattr,
3236                 .verf = {
3237                         [0] = (__u32)jiffies,
3238                         [1] = (__u32)current->pid,
3239                 },
3240         };
3241         int status;
3242
3243         do {
3244                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3245                 res = ctx->state;
3246                 trace_nfs4_open_file(ctx, flags, status);
3247                 if (status == 0)
3248                         break;
3249                 /* NOTE: BAD_SEQID means the server and client disagree about the
3250                  * book-keeping w.r.t. state-changing operations
3251                  * (OPEN/CLOSE/LOCK/LOCKU...)
3252                  * It is actually a sign of a bug on the client or on the server.
3253                  *
3254                  * If we receive a BAD_SEQID error in the particular case of
3255                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3256                  * have unhashed the old state_owner for us, and that we can
3257                  * therefore safely retry using a new one. We should still warn
3258                  * the user though...
3259                  */
3260                 if (status == -NFS4ERR_BAD_SEQID) {
3261                         pr_warn_ratelimited("NFS: v4 server %s "
3262                                         " returned a bad sequence-id error!\n",
3263                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3264                         exception.retry = 1;
3265                         continue;
3266                 }
3267                 /*
3268                  * BAD_STATEID on OPEN means that the server cancelled our
3269                  * state before it received the OPEN_CONFIRM.
3270                  * Recover by retrying the request as per the discussion
3271                  * on Page 181 of RFC3530.
3272                  */
3273                 if (status == -NFS4ERR_BAD_STATEID) {
3274                         exception.retry = 1;
3275                         continue;
3276                 }
3277                 if (status == -NFS4ERR_EXPIRED) {
3278                         nfs4_schedule_lease_recovery(server->nfs_client);
3279                         exception.retry = 1;
3280                         continue;
3281                 }
3282                 if (status == -EAGAIN) {
3283                         /* We must have found a delegation */
3284                         exception.retry = 1;
3285                         continue;
3286                 }
3287                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3288                         continue;
3289                 res = ERR_PTR(nfs4_handle_exception(server,
3290                                         status, &exception));
3291         } while (exception.retry);
3292         return res;
3293 }
3294
3295 static int _nfs4_do_setattr(struct inode *inode,
3296                             struct nfs_setattrargs *arg,
3297                             struct nfs_setattrres *res,
3298                             const struct cred *cred,
3299                             struct nfs_open_context *ctx)
3300 {
3301         struct nfs_server *server = NFS_SERVER(inode);
3302         struct rpc_message msg = {
3303                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3304                 .rpc_argp       = arg,
3305                 .rpc_resp       = res,
3306                 .rpc_cred       = cred,
3307         };
3308         const struct cred *delegation_cred = NULL;
3309         unsigned long timestamp = jiffies;
3310         bool truncate;
3311         int status;
3312
3313         nfs_fattr_init(res->fattr);
3314
3315         /* Servers should only apply open mode checks for file size changes */
3316         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3317         if (!truncate) {
3318                 nfs4_inode_make_writeable(inode);
3319                 goto zero_stateid;
3320         }
3321
3322         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3323                 /* Use that stateid */
3324         } else if (ctx != NULL && ctx->state) {
3325                 struct nfs_lock_context *l_ctx;
3326                 if (!nfs4_valid_open_stateid(ctx->state))
3327                         return -EBADF;
3328                 l_ctx = nfs_get_lock_context(ctx);
3329                 if (IS_ERR(l_ctx))
3330                         return PTR_ERR(l_ctx);
3331                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3332                                                 &arg->stateid, &delegation_cred);
3333                 nfs_put_lock_context(l_ctx);
3334                 if (status == -EIO)
3335                         return -EBADF;
3336                 else if (status == -EAGAIN)
3337                         goto zero_stateid;
3338         } else {
3339 zero_stateid:
3340                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3341         }
3342         if (delegation_cred)
3343                 msg.rpc_cred = delegation_cred;
3344
3345         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3346
3347         put_cred(delegation_cred);
3348         if (status == 0 && ctx != NULL)
3349                 renew_lease(server, timestamp);
3350         trace_nfs4_setattr(inode, &arg->stateid, status);
3351         return status;
3352 }
3353
3354 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3355                            struct nfs_fattr *fattr, struct iattr *sattr,
3356                            struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3357 {
3358         struct nfs_server *server = NFS_SERVER(inode);
3359         __u32 bitmask[NFS4_BITMASK_SZ];
3360         struct nfs4_state *state = ctx ? ctx->state : NULL;
3361         struct nfs_setattrargs  arg = {
3362                 .fh             = NFS_FH(inode),
3363                 .iap            = sattr,
3364                 .server         = server,
3365                 .bitmask = bitmask,
3366                 .label          = ilabel,
3367         };
3368         struct nfs_setattrres  res = {
3369                 .fattr          = fattr,
3370                 .server         = server,
3371         };
3372         struct nfs4_exception exception = {
3373                 .state = state,
3374                 .inode = inode,
3375                 .stateid = &arg.stateid,
3376         };
3377         unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3378         int err;
3379
3380         if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3381                 adjust_flags |= NFS_INO_INVALID_MODE;
3382         if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3383                 adjust_flags |= NFS_INO_INVALID_OTHER;
3384
3385         do {
3386                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3387                                         inode, adjust_flags);
3388
3389                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3390                 switch (err) {
3391                 case -NFS4ERR_OPENMODE:
3392                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3393                                 pr_warn_once("NFSv4: server %s is incorrectly "
3394                                                 "applying open mode checks to "
3395                                                 "a SETATTR that is not "
3396                                                 "changing file size.\n",
3397                                                 server->nfs_client->cl_hostname);
3398                         }
3399                         if (state && !(state->state & FMODE_WRITE)) {
3400                                 err = -EBADF;
3401                                 if (sattr->ia_valid & ATTR_OPEN)
3402                                         err = -EACCES;
3403                                 goto out;
3404                         }
3405                 }
3406                 err = nfs4_handle_exception(server, err, &exception);
3407         } while (exception.retry);
3408 out:
3409         return err;
3410 }
3411
3412 static bool
3413 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3414 {
3415         if (inode == NULL || !nfs_have_layout(inode))
3416                 return false;
3417
3418         return pnfs_wait_on_layoutreturn(inode, task);
3419 }
3420
3421 /*
3422  * Update the seqid of an open stateid
3423  */
3424 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3425                 struct nfs4_state *state)
3426 {
3427         __be32 seqid_open;
3428         u32 dst_seqid;
3429         int seq;
3430
3431         for (;;) {
3432                 if (!nfs4_valid_open_stateid(state))
3433                         break;
3434                 seq = read_seqbegin(&state->seqlock);
3435                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3436                         nfs4_stateid_copy(dst, &state->open_stateid);
3437                         if (read_seqretry(&state->seqlock, seq))
3438                                 continue;
3439                         break;
3440                 }
3441                 seqid_open = state->open_stateid.seqid;
3442                 if (read_seqretry(&state->seqlock, seq))
3443                         continue;
3444
3445                 dst_seqid = be32_to_cpu(dst->seqid);
3446                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3447                         dst->seqid = seqid_open;
3448                 break;
3449         }
3450 }
3451
3452 /*
3453  * Update the seqid of an open stateid after receiving
3454  * NFS4ERR_OLD_STATEID
3455  */
3456 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3457                 struct nfs4_state *state)
3458 {
3459         __be32 seqid_open;
3460         u32 dst_seqid;
3461         bool ret;
3462         int seq, status = -EAGAIN;
3463         DEFINE_WAIT(wait);
3464
3465         for (;;) {
3466                 ret = false;
3467                 if (!nfs4_valid_open_stateid(state))
3468                         break;
3469                 seq = read_seqbegin(&state->seqlock);
3470                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3471                         if (read_seqretry(&state->seqlock, seq))
3472                                 continue;
3473                         break;
3474                 }
3475
3476                 write_seqlock(&state->seqlock);
3477                 seqid_open = state->open_stateid.seqid;
3478
3479                 dst_seqid = be32_to_cpu(dst->seqid);
3480
3481                 /* Did another OPEN bump the state's seqid?  try again: */
3482                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3483                         dst->seqid = seqid_open;
3484                         write_sequnlock(&state->seqlock);
3485                         ret = true;
3486                         break;
3487                 }
3488
3489                 /* server says we're behind but we haven't seen the update yet */
3490                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3491                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3492                 write_sequnlock(&state->seqlock);
3493                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3494
3495                 if (fatal_signal_pending(current))
3496                         status = -EINTR;
3497                 else
3498                         if (schedule_timeout(5*HZ) != 0)
3499                                 status = 0;
3500
3501                 finish_wait(&state->waitq, &wait);
3502
3503                 if (!status)
3504                         continue;
3505                 if (status == -EINTR)
3506                         break;
3507
3508                 /* we slept the whole 5 seconds, we must have lost a seqid */
3509                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3510                 ret = true;
3511                 break;
3512         }
3513
3514         return ret;
3515 }
3516
3517 struct nfs4_closedata {
3518         struct inode *inode;
3519         struct nfs4_state *state;
3520         struct nfs_closeargs arg;
3521         struct nfs_closeres res;
3522         struct {
3523                 struct nfs4_layoutreturn_args arg;
3524                 struct nfs4_layoutreturn_res res;
3525                 struct nfs4_xdr_opaque_data ld_private;
3526                 u32 roc_barrier;
3527                 bool roc;
3528         } lr;
3529         struct nfs_fattr fattr;
3530         unsigned long timestamp;
3531 };
3532
3533 static void nfs4_free_closedata(void *data)
3534 {
3535         struct nfs4_closedata *calldata = data;
3536         struct nfs4_state_owner *sp = calldata->state->owner;
3537         struct super_block *sb = calldata->state->inode->i_sb;
3538
3539         if (calldata->lr.roc)
3540                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3541                                 calldata->res.lr_ret);
3542         nfs4_put_open_state(calldata->state);
3543         nfs_free_seqid(calldata->arg.seqid);
3544         nfs4_put_state_owner(sp);
3545         nfs_sb_deactive(sb);
3546         kfree(calldata);
3547 }
3548
3549 static void nfs4_close_done(struct rpc_task *task, void *data)
3550 {
3551         struct nfs4_closedata *calldata = data;
3552         struct nfs4_state *state = calldata->state;
3553         struct nfs_server *server = NFS_SERVER(calldata->inode);
3554         nfs4_stateid *res_stateid = NULL;
3555         struct nfs4_exception exception = {
3556                 .state = state,
3557                 .inode = calldata->inode,
3558                 .stateid = &calldata->arg.stateid,
3559         };
3560
3561         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3562                 return;
3563         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3564
3565         /* Handle Layoutreturn errors */
3566         if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3567                           &calldata->res.lr_ret) == -EAGAIN)
3568                 goto out_restart;
3569
3570         /* hmm. we are done with the inode, and in the process of freeing
3571          * the state_owner. we keep this around to process errors
3572          */
3573         switch (task->tk_status) {
3574                 case 0:
3575                         res_stateid = &calldata->res.stateid;
3576                         renew_lease(server, calldata->timestamp);
3577                         break;
3578                 case -NFS4ERR_ACCESS:
3579                         if (calldata->arg.bitmask != NULL) {
3580                                 calldata->arg.bitmask = NULL;
3581                                 calldata->res.fattr = NULL;
3582                                 goto out_restart;
3583
3584                         }
3585                         break;
3586                 case -NFS4ERR_OLD_STATEID:
3587                         /* Did we race with OPEN? */
3588                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3589                                                 state))
3590                                 goto out_restart;
3591                         goto out_release;
3592                 case -NFS4ERR_ADMIN_REVOKED:
3593                 case -NFS4ERR_STALE_STATEID:
3594                 case -NFS4ERR_EXPIRED:
3595                         nfs4_free_revoked_stateid(server,
3596                                         &calldata->arg.stateid,
3597                                         task->tk_msg.rpc_cred);
3598                         fallthrough;
3599                 case -NFS4ERR_BAD_STATEID:
3600                         if (calldata->arg.fmode == 0)
3601                                 break;
3602                         fallthrough;
3603                 default:
3604                         task->tk_status = nfs4_async_handle_exception(task,
3605                                         server, task->tk_status, &exception);
3606                         if (exception.retry)
3607                                 goto out_restart;
3608         }
3609         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3610                         res_stateid, calldata->arg.fmode);
3611 out_release:
3612         task->tk_status = 0;
3613         nfs_release_seqid(calldata->arg.seqid);
3614         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3615         dprintk("%s: ret = %d\n", __func__, task->tk_status);
3616         return;
3617 out_restart:
3618         task->tk_status = 0;
3619         rpc_restart_call_prepare(task);
3620         goto out_release;
3621 }
3622
3623 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3624 {
3625         struct nfs4_closedata *calldata = data;
3626         struct nfs4_state *state = calldata->state;
3627         struct inode *inode = calldata->inode;
3628         struct nfs_server *server = NFS_SERVER(inode);
3629         struct pnfs_layout_hdr *lo;
3630         bool is_rdonly, is_wronly, is_rdwr;
3631         int call_close = 0;
3632
3633         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3634                 goto out_wait;
3635
3636         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3637         spin_lock(&state->owner->so_lock);
3638         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3639         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3640         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3641         /* Calculate the change in open mode */
3642         calldata->arg.fmode = 0;
3643         if (state->n_rdwr == 0) {
3644                 if (state->n_rdonly == 0)
3645                         call_close |= is_rdonly;
3646                 else if (is_rdonly)
3647                         calldata->arg.fmode |= FMODE_READ;
3648                 if (state->n_wronly == 0)
3649                         call_close |= is_wronly;
3650                 else if (is_wronly)
3651                         calldata->arg.fmode |= FMODE_WRITE;
3652                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3653                         call_close |= is_rdwr;
3654         } else if (is_rdwr)
3655                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3656
3657         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3658         if (!nfs4_valid_open_stateid(state))
3659                 call_close = 0;
3660         spin_unlock(&state->owner->so_lock);
3661
3662         if (!call_close) {
3663                 /* Note: exit _without_ calling nfs4_close_done */
3664                 goto out_no_action;
3665         }
3666
3667         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3668                 nfs_release_seqid(calldata->arg.seqid);
3669                 goto out_wait;
3670         }
3671
3672         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3673         if (lo && !pnfs_layout_is_valid(lo)) {
3674                 calldata->arg.lr_args = NULL;
3675                 calldata->res.lr_res = NULL;
3676         }
3677
3678         if (calldata->arg.fmode == 0)
3679                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3680
3681         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3682                 /* Close-to-open cache consistency revalidation */
3683                 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3684                         nfs4_bitmask_set(calldata->arg.bitmask_store,
3685                                          server->cache_consistency_bitmask,
3686                                          inode, 0);
3687                         calldata->arg.bitmask = calldata->arg.bitmask_store;
3688                 } else
3689                         calldata->arg.bitmask = NULL;
3690         }
3691
3692         calldata->arg.share_access =
3693                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3694                                 calldata->arg.fmode, 0);
3695
3696         if (calldata->res.fattr == NULL)
3697                 calldata->arg.bitmask = NULL;
3698         else if (calldata->arg.bitmask == NULL)
3699                 calldata->res.fattr = NULL;
3700         calldata->timestamp = jiffies;
3701         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3702                                 &calldata->arg.seq_args,
3703                                 &calldata->res.seq_res,
3704                                 task) != 0)
3705                 nfs_release_seqid(calldata->arg.seqid);
3706         return;
3707 out_no_action:
3708         task->tk_action = NULL;
3709 out_wait:
3710         nfs4_sequence_done(task, &calldata->res.seq_res);
3711 }
3712
3713 static const struct rpc_call_ops nfs4_close_ops = {
3714         .rpc_call_prepare = nfs4_close_prepare,
3715         .rpc_call_done = nfs4_close_done,
3716         .rpc_release = nfs4_free_closedata,
3717 };
3718
3719 /*
3720  * It is possible for data to be read/written from a mem-mapped file
3721  * after the sys_close call (which hits the vfs layer as a flush).
3722  * This means that we can't safely call nfsv4 close on a file until
3723  * the inode is cleared. This in turn means that we are not good
3724  * NFSv4 citizens - we do not indicate to the server to update the file's
3725  * share state even when we are done with one of the three share
3726  * stateid's in the inode.
3727  *
3728  * NOTE: Caller must be holding the sp->so_owner semaphore!
3729  */
3730 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3731 {
3732         struct nfs_server *server = NFS_SERVER(state->inode);
3733         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3734         struct nfs4_closedata *calldata;
3735         struct nfs4_state_owner *sp = state->owner;
3736         struct rpc_task *task;
3737         struct rpc_message msg = {
3738                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3739                 .rpc_cred = state->owner->so_cred,
3740         };
3741         struct rpc_task_setup task_setup_data = {
3742                 .rpc_client = server->client,
3743                 .rpc_message = &msg,
3744                 .callback_ops = &nfs4_close_ops,
3745                 .workqueue = nfsiod_workqueue,
3746                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3747         };
3748         int status = -ENOMEM;
3749
3750         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3751                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3752
3753         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3754                 &task_setup_data.rpc_client, &msg);
3755
3756         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3757         if (calldata == NULL)
3758                 goto out;
3759         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3760         calldata->inode = state->inode;
3761         calldata->state = state;
3762         calldata->arg.fh = NFS_FH(state->inode);
3763         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3764                 goto out_free_calldata;
3765         /* Serialization for the sequence id */
3766         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3767         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3768         if (IS_ERR(calldata->arg.seqid))
3769                 goto out_free_calldata;
3770         nfs_fattr_init(&calldata->fattr);
3771         calldata->arg.fmode = 0;
3772         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3773         calldata->res.fattr = &calldata->fattr;
3774         calldata->res.seqid = calldata->arg.seqid;
3775         calldata->res.server = server;
3776         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3777         calldata->lr.roc = pnfs_roc(state->inode,
3778                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3779         if (calldata->lr.roc) {
3780                 calldata->arg.lr_args = &calldata->lr.arg;
3781                 calldata->res.lr_res = &calldata->lr.res;
3782         }
3783         nfs_sb_active(calldata->inode->i_sb);
3784
3785         msg.rpc_argp = &calldata->arg;
3786         msg.rpc_resp = &calldata->res;
3787         task_setup_data.callback_data = calldata;
3788         task = rpc_run_task(&task_setup_data);
3789         if (IS_ERR(task))
3790                 return PTR_ERR(task);
3791         status = 0;
3792         if (wait)
3793                 status = rpc_wait_for_completion_task(task);
3794         rpc_put_task(task);
3795         return status;
3796 out_free_calldata:
3797         kfree(calldata);
3798 out:
3799         nfs4_put_open_state(state);
3800         nfs4_put_state_owner(sp);
3801         return status;
3802 }
3803
3804 static struct inode *
3805 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3806                 int open_flags, struct iattr *attr, int *opened)
3807 {
3808         struct nfs4_state *state;
3809         struct nfs4_label l, *label;
3810
3811         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3812
3813         /* Protect against concurrent sillydeletes */
3814         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3815
3816         nfs4_label_release_security(label);
3817
3818         if (IS_ERR(state))
3819                 return ERR_CAST(state);
3820         return state->inode;
3821 }
3822
3823 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3824 {
3825         if (ctx->state == NULL)
3826                 return;
3827         if (is_sync)
3828                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3829         else
3830                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3831 }
3832
3833 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3834 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3835 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3836
3837 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3838 {
3839         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3840         struct nfs4_server_caps_arg args = {
3841                 .fhandle = fhandle,
3842                 .bitmask = bitmask,
3843         };
3844         struct nfs4_server_caps_res res = {};
3845         struct rpc_message msg = {
3846                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3847                 .rpc_argp = &args,
3848                 .rpc_resp = &res,
3849         };
3850         int status;
3851         int i;
3852
3853         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3854                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3855                      FATTR4_WORD0_LINK_SUPPORT |
3856                      FATTR4_WORD0_SYMLINK_SUPPORT |
3857                      FATTR4_WORD0_ACLSUPPORT |
3858                      FATTR4_WORD0_CASE_INSENSITIVE |
3859                      FATTR4_WORD0_CASE_PRESERVING;
3860         if (minorversion)
3861                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3862
3863         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3864         if (status == 0) {
3865                 /* Sanity check the server answers */
3866                 switch (minorversion) {
3867                 case 0:
3868                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3869                         res.attr_bitmask[2] = 0;
3870                         break;
3871                 case 1:
3872                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3873                         break;
3874                 case 2:
3875                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3876                 }
3877                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3878                 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3879                                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3880                 server->fattr_valid = NFS_ATTR_FATTR_V4;
3881                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3882                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3883                         server->caps |= NFS_CAP_ACLS;
3884                 if (res.has_links != 0)
3885                         server->caps |= NFS_CAP_HARDLINKS;
3886                 if (res.has_symlinks != 0)
3887                         server->caps |= NFS_CAP_SYMLINKS;
3888                 if (res.case_insensitive)
3889                         server->caps |= NFS_CAP_CASE_INSENSITIVE;
3890                 if (res.case_preserving)
3891                         server->caps |= NFS_CAP_CASE_PRESERVING;
3892 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3893                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3894                         server->caps |= NFS_CAP_SECURITY_LABEL;
3895 #endif
3896                 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3897                         server->caps |= NFS_CAP_FS_LOCATIONS;
3898                 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3899                         server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3900                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3901                         server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3902                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3903                         server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3904                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3905                         server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3906                                 NFS_ATTR_FATTR_OWNER_NAME);
3907                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3908                         server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3909                                 NFS_ATTR_FATTR_GROUP_NAME);
3910                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3911                         server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3912                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3913                         server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3914                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3915                         server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3916                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3917                         server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3918                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3919                                 sizeof(server->attr_bitmask));
3920                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3921
3922                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3923                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3924                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3925                 server->cache_consistency_bitmask[2] = 0;
3926
3927                 /* Avoid a regression due to buggy server */
3928                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3929                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3930                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3931                         sizeof(server->exclcreat_bitmask));
3932
3933                 server->acl_bitmask = res.acl_bitmask;
3934                 server->fh_expire_type = res.fh_expire_type;
3935         }
3936
3937         return status;
3938 }
3939
3940 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3941 {
3942         struct nfs4_exception exception = {
3943                 .interruptible = true,
3944         };
3945         int err;
3946
3947         nfs4_server_set_init_caps(server);
3948         do {
3949                 err = nfs4_handle_exception(server,
3950                                 _nfs4_server_capabilities(server, fhandle),
3951                                 &exception);
3952         } while (exception.retry);
3953         return err;
3954 }
3955
3956 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3957                                           struct nfs_client *clp,
3958                                           struct nfs_server *server)
3959 {
3960         int i;
3961
3962         for (i = 0; i < location->nservers; i++) {
3963                 struct nfs4_string *srv_loc = &location->servers[i];
3964                 struct sockaddr_storage addr;
3965                 size_t addrlen;
3966                 struct xprt_create xprt_args = {
3967                         .ident = 0,
3968                         .net = clp->cl_net,
3969                 };
3970                 struct nfs4_add_xprt_data xprtdata = {
3971                         .clp = clp,
3972                 };
3973                 struct rpc_add_xprt_test rpcdata = {
3974                         .add_xprt_test = clp->cl_mvops->session_trunk,
3975                         .data = &xprtdata,
3976                 };
3977                 char *servername = NULL;
3978
3979                 if (!srv_loc->len)
3980                         continue;
3981
3982                 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
3983                                                 &addr, sizeof(addr),
3984                                                 clp->cl_net, server->port);
3985                 if (!addrlen)
3986                         return;
3987                 xprt_args.dstaddr = (struct sockaddr *)&addr;
3988                 xprt_args.addrlen = addrlen;
3989                 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
3990                 if (!servername)
3991                         return;
3992                 memcpy(servername, srv_loc->data, srv_loc->len);
3993                 servername[srv_loc->len] = '\0';
3994                 xprt_args.servername = servername;
3995
3996                 xprtdata.cred = nfs4_get_clid_cred(clp);
3997                 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
3998                                   rpc_clnt_setup_test_and_add_xprt,
3999                                   &rpcdata);
4000                 if (xprtdata.cred)
4001                         put_cred(xprtdata.cred);
4002                 kfree(servername);
4003         }
4004 }
4005
4006 static int _nfs4_discover_trunking(struct nfs_server *server,
4007                                    struct nfs_fh *fhandle)
4008 {
4009         struct nfs4_fs_locations *locations = NULL;
4010         struct page *page;
4011         const struct cred *cred;
4012         struct nfs_client *clp = server->nfs_client;
4013         const struct nfs4_state_maintenance_ops *ops =
4014                 clp->cl_mvops->state_renewal_ops;
4015         int status = -ENOMEM, i;
4016
4017         cred = ops->get_state_renewal_cred(clp);
4018         if (cred == NULL) {
4019                 cred = nfs4_get_clid_cred(clp);
4020                 if (cred == NULL)
4021                         return -ENOKEY;
4022         }
4023
4024         page = alloc_page(GFP_KERNEL);
4025         if (!page)
4026                 goto out_put_cred;
4027         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4028         if (!locations)
4029                 goto out_free;
4030         locations->fattr = nfs_alloc_fattr();
4031         if (!locations->fattr)
4032                 goto out_free_2;
4033
4034         status = nfs4_proc_get_locations(server, fhandle, locations, page,
4035                                          cred);
4036         if (status)
4037                 goto out_free_3;
4038
4039         for (i = 0; i < locations->nlocations; i++)
4040                 test_fs_location_for_trunking(&locations->locations[i], clp,
4041                                               server);
4042 out_free_3:
4043         kfree(locations->fattr);
4044 out_free_2:
4045         kfree(locations);
4046 out_free:
4047         __free_page(page);
4048 out_put_cred:
4049         put_cred(cred);
4050         return status;
4051 }
4052
4053 static int nfs4_discover_trunking(struct nfs_server *server,
4054                                   struct nfs_fh *fhandle)
4055 {
4056         struct nfs4_exception exception = {
4057                 .interruptible = true,
4058         };
4059         struct nfs_client *clp = server->nfs_client;
4060         int err = 0;
4061
4062         if (!nfs4_has_session(clp))
4063                 goto out;
4064         do {
4065                 err = nfs4_handle_exception(server,
4066                                 _nfs4_discover_trunking(server, fhandle),
4067                                 &exception);
4068         } while (exception.retry);
4069 out:
4070         return err;
4071 }
4072
4073 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4074                 struct nfs_fsinfo *info)
4075 {
4076         u32 bitmask[3];
4077         struct nfs4_lookup_root_arg args = {
4078                 .bitmask = bitmask,
4079         };
4080         struct nfs4_lookup_res res = {
4081                 .server = server,
4082                 .fattr = info->fattr,
4083                 .fh = fhandle,
4084         };
4085         struct rpc_message msg = {
4086                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4087                 .rpc_argp = &args,
4088                 .rpc_resp = &res,
4089         };
4090
4091         bitmask[0] = nfs4_fattr_bitmap[0];
4092         bitmask[1] = nfs4_fattr_bitmap[1];
4093         /*
4094          * Process the label in the upcoming getfattr
4095          */
4096         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4097
4098         nfs_fattr_init(info->fattr);
4099         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4100 }
4101
4102 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4103                 struct nfs_fsinfo *info)
4104 {
4105         struct nfs4_exception exception = {
4106                 .interruptible = true,
4107         };
4108         int err;
4109         do {
4110                 err = _nfs4_lookup_root(server, fhandle, info);
4111                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4112                 switch (err) {
4113                 case 0:
4114                 case -NFS4ERR_WRONGSEC:
4115                         goto out;
4116                 default:
4117                         err = nfs4_handle_exception(server, err, &exception);
4118                 }
4119         } while (exception.retry);
4120 out:
4121         return err;
4122 }
4123
4124 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4125                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4126 {
4127         struct rpc_auth_create_args auth_args = {
4128                 .pseudoflavor = flavor,
4129         };
4130         struct rpc_auth *auth;
4131
4132         auth = rpcauth_create(&auth_args, server->client);
4133         if (IS_ERR(auth))
4134                 return -EACCES;
4135         return nfs4_lookup_root(server, fhandle, info);
4136 }
4137
4138 /*
4139  * Retry pseudoroot lookup with various security flavors.  We do this when:
4140  *
4141  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4142  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4143  *
4144  * Returns zero on success, or a negative NFS4ERR value, or a
4145  * negative errno value.
4146  */
4147 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4148                               struct nfs_fsinfo *info)
4149 {
4150         /* Per 3530bis 15.33.5 */
4151         static const rpc_authflavor_t flav_array[] = {
4152                 RPC_AUTH_GSS_KRB5P,
4153                 RPC_AUTH_GSS_KRB5I,
4154                 RPC_AUTH_GSS_KRB5,
4155                 RPC_AUTH_UNIX,                  /* courtesy */
4156                 RPC_AUTH_NULL,
4157         };
4158         int status = -EPERM;
4159         size_t i;
4160
4161         if (server->auth_info.flavor_len > 0) {
4162                 /* try each flavor specified by user */
4163                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4164                         status = nfs4_lookup_root_sec(server, fhandle, info,
4165                                                 server->auth_info.flavors[i]);
4166                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4167                                 continue;
4168                         break;
4169                 }
4170         } else {
4171                 /* no flavors specified by user, try default list */
4172                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4173                         status = nfs4_lookup_root_sec(server, fhandle, info,
4174                                                       flav_array[i]);
4175                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4176                                 continue;
4177                         break;
4178                 }
4179         }
4180
4181         /*
4182          * -EACCES could mean that the user doesn't have correct permissions
4183          * to access the mount.  It could also mean that we tried to mount
4184          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4185          * existing mount programs don't handle -EACCES very well so it should
4186          * be mapped to -EPERM instead.
4187          */
4188         if (status == -EACCES)
4189                 status = -EPERM;
4190         return status;
4191 }
4192
4193 /**
4194  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4195  * @server: initialized nfs_server handle
4196  * @fhandle: we fill in the pseudo-fs root file handle
4197  * @info: we fill in an FSINFO struct
4198  * @auth_probe: probe the auth flavours
4199  *
4200  * Returns zero on success, or a negative errno.
4201  */
4202 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4203                          struct nfs_fsinfo *info,
4204                          bool auth_probe)
4205 {
4206         int status = 0;
4207
4208         if (!auth_probe)
4209                 status = nfs4_lookup_root(server, fhandle, info);
4210
4211         if (auth_probe || status == NFS4ERR_WRONGSEC)
4212                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4213                                 fhandle, info);
4214
4215         if (status == 0)
4216                 status = nfs4_server_capabilities(server, fhandle);
4217         if (status == 0)
4218                 status = nfs4_do_fsinfo(server, fhandle, info);
4219
4220         return nfs4_map_errors(status);
4221 }
4222
4223 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4224                               struct nfs_fsinfo *info)
4225 {
4226         int error;
4227         struct nfs_fattr *fattr = info->fattr;
4228
4229         error = nfs4_server_capabilities(server, mntfh);
4230         if (error < 0) {
4231                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4232                 return error;
4233         }
4234
4235         error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4236         if (error < 0) {
4237                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4238                 goto out;
4239         }
4240
4241         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4242             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4243                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4244
4245 out:
4246         return error;
4247 }
4248
4249 /*
4250  * Get locations and (maybe) other attributes of a referral.
4251  * Note that we'll actually follow the referral later when
4252  * we detect fsid mismatch in inode revalidation
4253  */
4254 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4255                              const struct qstr *name, struct nfs_fattr *fattr,
4256                              struct nfs_fh *fhandle)
4257 {
4258         int status = -ENOMEM;
4259         struct page *page = NULL;
4260         struct nfs4_fs_locations *locations = NULL;
4261
4262         page = alloc_page(GFP_KERNEL);
4263         if (page == NULL)
4264                 goto out;
4265         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4266         if (locations == NULL)
4267                 goto out;
4268
4269         locations->fattr = fattr;
4270
4271         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4272         if (status != 0)
4273                 goto out;
4274
4275         /*
4276          * If the fsid didn't change, this is a migration event, not a
4277          * referral.  Cause us to drop into the exception handler, which
4278          * will kick off migration recovery.
4279          */
4280         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4281                 dprintk("%s: server did not return a different fsid for"
4282                         " a referral at %s\n", __func__, name->name);
4283                 status = -NFS4ERR_MOVED;
4284                 goto out;
4285         }
4286         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4287         nfs_fixup_referral_attributes(fattr);
4288         memset(fhandle, 0, sizeof(struct nfs_fh));
4289 out:
4290         if (page)
4291                 __free_page(page);
4292         kfree(locations);
4293         return status;
4294 }
4295
4296 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4297                                 struct nfs_fattr *fattr, struct inode *inode)
4298 {
4299         __u32 bitmask[NFS4_BITMASK_SZ];
4300         struct nfs4_getattr_arg args = {
4301                 .fh = fhandle,
4302                 .bitmask = bitmask,
4303         };
4304         struct nfs4_getattr_res res = {
4305                 .fattr = fattr,
4306                 .server = server,
4307         };
4308         struct rpc_message msg = {
4309                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4310                 .rpc_argp = &args,
4311                 .rpc_resp = &res,
4312         };
4313         unsigned short task_flags = 0;
4314
4315         if (nfs4_has_session(server->nfs_client))
4316                 task_flags = RPC_TASK_MOVEABLE;
4317
4318         /* Is this is an attribute revalidation, subject to softreval? */
4319         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4320                 task_flags |= RPC_TASK_TIMEOUT;
4321
4322         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4323         nfs_fattr_init(fattr);
4324         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4325         return nfs4_do_call_sync(server->client, server, &msg,
4326                         &args.seq_args, &res.seq_res, task_flags);
4327 }
4328
4329 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4330                                 struct nfs_fattr *fattr, struct inode *inode)
4331 {
4332         struct nfs4_exception exception = {
4333                 .interruptible = true,
4334         };
4335         int err;
4336         do {
4337                 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4338                 trace_nfs4_getattr(server, fhandle, fattr, err);
4339                 err = nfs4_handle_exception(server, err,
4340                                 &exception);
4341         } while (exception.retry);
4342         return err;
4343 }
4344
4345 /*
4346  * The file is not closed if it is opened due to the a request to change
4347  * the size of the file. The open call will not be needed once the
4348  * VFS layer lookup-intents are implemented.
4349  *
4350  * Close is called when the inode is destroyed.
4351  * If we haven't opened the file for O_WRONLY, we
4352  * need to in the size_change case to obtain a stateid.
4353  *
4354  * Got race?
4355  * Because OPEN is always done by name in nfsv4, it is
4356  * possible that we opened a different file by the same
4357  * name.  We can recognize this race condition, but we
4358  * can't do anything about it besides returning an error.
4359  *
4360  * This will be fixed with VFS changes (lookup-intent).
4361  */
4362 static int
4363 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4364                   struct iattr *sattr)
4365 {
4366         struct inode *inode = d_inode(dentry);
4367         const struct cred *cred = NULL;
4368         struct nfs_open_context *ctx = NULL;
4369         int status;
4370
4371         if (pnfs_ld_layoutret_on_setattr(inode) &&
4372             sattr->ia_valid & ATTR_SIZE &&
4373             sattr->ia_size < i_size_read(inode))
4374                 pnfs_commit_and_return_layout(inode);
4375
4376         nfs_fattr_init(fattr);
4377
4378         /* Deal with open(O_TRUNC) */
4379         if (sattr->ia_valid & ATTR_OPEN)
4380                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4381
4382         /* Optimization: if the end result is no change, don't RPC */
4383         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4384                 return 0;
4385
4386         /* Search for an existing open(O_WRITE) file */
4387         if (sattr->ia_valid & ATTR_FILE) {
4388
4389                 ctx = nfs_file_open_context(sattr->ia_file);
4390                 if (ctx)
4391                         cred = ctx->cred;
4392         }
4393
4394         /* Return any delegations if we're going to change ACLs */
4395         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4396                 nfs4_inode_make_writeable(inode);
4397
4398         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4399         if (status == 0) {
4400                 nfs_setattr_update_inode(inode, sattr, fattr);
4401                 nfs_setsecurity(inode, fattr);
4402         }
4403         return status;
4404 }
4405
4406 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4407                 struct dentry *dentry, struct nfs_fh *fhandle,
4408                 struct nfs_fattr *fattr)
4409 {
4410         struct nfs_server *server = NFS_SERVER(dir);
4411         int                    status;
4412         struct nfs4_lookup_arg args = {
4413                 .bitmask = server->attr_bitmask,
4414                 .dir_fh = NFS_FH(dir),
4415                 .name = &dentry->d_name,
4416         };
4417         struct nfs4_lookup_res res = {
4418                 .server = server,
4419                 .fattr = fattr,
4420                 .fh = fhandle,
4421         };
4422         struct rpc_message msg = {
4423                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4424                 .rpc_argp = &args,
4425                 .rpc_resp = &res,
4426         };
4427         unsigned short task_flags = 0;
4428
4429         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4430                 task_flags = RPC_TASK_MOVEABLE;
4431
4432         /* Is this is an attribute revalidation, subject to softreval? */
4433         if (nfs_lookup_is_soft_revalidate(dentry))
4434                 task_flags |= RPC_TASK_TIMEOUT;
4435
4436         args.bitmask = nfs4_bitmask(server, fattr->label);
4437
4438         nfs_fattr_init(fattr);
4439
4440         dprintk("NFS call  lookup %pd2\n", dentry);
4441         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4442         status = nfs4_do_call_sync(clnt, server, &msg,
4443                         &args.seq_args, &res.seq_res, task_flags);
4444         dprintk("NFS reply lookup: %d\n", status);
4445         return status;
4446 }
4447
4448 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4449 {
4450         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4451                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4452         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4453         fattr->nlink = 2;
4454 }
4455
4456 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4457                                    struct dentry *dentry, struct nfs_fh *fhandle,
4458                                    struct nfs_fattr *fattr)
4459 {
4460         struct nfs4_exception exception = {
4461                 .interruptible = true,
4462         };
4463         struct rpc_clnt *client = *clnt;
4464         const struct qstr *name = &dentry->d_name;
4465         int err;
4466         do {
4467                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4468                 trace_nfs4_lookup(dir, name, err);
4469                 switch (err) {
4470                 case -NFS4ERR_BADNAME:
4471                         err = -ENOENT;
4472                         goto out;
4473                 case -NFS4ERR_MOVED:
4474                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4475                         if (err == -NFS4ERR_MOVED)
4476                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4477                         goto out;
4478                 case -NFS4ERR_WRONGSEC:
4479                         err = -EPERM;
4480                         if (client != *clnt)
4481                                 goto out;
4482                         client = nfs4_negotiate_security(client, dir, name);
4483                         if (IS_ERR(client))
4484                                 return PTR_ERR(client);
4485
4486                         exception.retry = 1;
4487                         break;
4488                 default:
4489                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4490                 }
4491         } while (exception.retry);
4492
4493 out:
4494         if (err == 0)
4495                 *clnt = client;
4496         else if (client != *clnt)
4497                 rpc_shutdown_client(client);
4498
4499         return err;
4500 }
4501
4502 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4503                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4504 {
4505         int status;
4506         struct rpc_clnt *client = NFS_CLIENT(dir);
4507
4508         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4509         if (client != NFS_CLIENT(dir)) {
4510                 rpc_shutdown_client(client);
4511                 nfs_fixup_secinfo_attributes(fattr);
4512         }
4513         return status;
4514 }
4515
4516 struct rpc_clnt *
4517 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4518                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4519 {
4520         struct rpc_clnt *client = NFS_CLIENT(dir);
4521         int status;
4522
4523         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4524         if (status < 0)
4525                 return ERR_PTR(status);
4526         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4527 }
4528
4529 static int _nfs4_proc_lookupp(struct inode *inode,
4530                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4531 {
4532         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4533         struct nfs_server *server = NFS_SERVER(inode);
4534         int                    status;
4535         struct nfs4_lookupp_arg args = {
4536                 .bitmask = server->attr_bitmask,
4537                 .fh = NFS_FH(inode),
4538         };
4539         struct nfs4_lookupp_res res = {
4540                 .server = server,
4541                 .fattr = fattr,
4542                 .fh = fhandle,
4543         };
4544         struct rpc_message msg = {
4545                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4546                 .rpc_argp = &args,
4547                 .rpc_resp = &res,
4548         };
4549         unsigned short task_flags = 0;
4550
4551         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4552                 task_flags |= RPC_TASK_TIMEOUT;
4553
4554         args.bitmask = nfs4_bitmask(server, fattr->label);
4555
4556         nfs_fattr_init(fattr);
4557
4558         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4559         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4560                                 &res.seq_res, task_flags);
4561         dprintk("NFS reply lookupp: %d\n", status);
4562         return status;
4563 }
4564
4565 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4566                              struct nfs_fattr *fattr)
4567 {
4568         struct nfs4_exception exception = {
4569                 .interruptible = true,
4570         };
4571         int err;
4572         do {
4573                 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4574                 trace_nfs4_lookupp(inode, err);
4575                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4576                                 &exception);
4577         } while (exception.retry);
4578         return err;
4579 }
4580
4581 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4582                              const struct cred *cred)
4583 {
4584         struct nfs_server *server = NFS_SERVER(inode);
4585         struct nfs4_accessargs args = {
4586                 .fh = NFS_FH(inode),
4587                 .access = entry->mask,
4588         };
4589         struct nfs4_accessres res = {
4590                 .server = server,
4591         };
4592         struct rpc_message msg = {
4593                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4594                 .rpc_argp = &args,
4595                 .rpc_resp = &res,
4596                 .rpc_cred = cred,
4597         };
4598         int status = 0;
4599
4600         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4601                 res.fattr = nfs_alloc_fattr();
4602                 if (res.fattr == NULL)
4603                         return -ENOMEM;
4604                 args.bitmask = server->cache_consistency_bitmask;
4605         }
4606         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4607         if (!status) {
4608                 nfs_access_set_mask(entry, res.access);
4609                 if (res.fattr)
4610                         nfs_refresh_inode(inode, res.fattr);
4611         }
4612         nfs_free_fattr(res.fattr);
4613         return status;
4614 }
4615
4616 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4617                             const struct cred *cred)
4618 {
4619         struct nfs4_exception exception = {
4620                 .interruptible = true,
4621         };
4622         int err;
4623         do {
4624                 err = _nfs4_proc_access(inode, entry, cred);
4625                 trace_nfs4_access(inode, err);
4626                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4627                                 &exception);
4628         } while (exception.retry);
4629         return err;
4630 }
4631
4632 /*
4633  * TODO: For the time being, we don't try to get any attributes
4634  * along with any of the zero-copy operations READ, READDIR,
4635  * READLINK, WRITE.
4636  *
4637  * In the case of the first three, we want to put the GETATTR
4638  * after the read-type operation -- this is because it is hard
4639  * to predict the length of a GETATTR response in v4, and thus
4640  * align the READ data correctly.  This means that the GETATTR
4641  * may end up partially falling into the page cache, and we should
4642  * shift it into the 'tail' of the xdr_buf before processing.
4643  * To do this efficiently, we need to know the total length
4644  * of data received, which doesn't seem to be available outside
4645  * of the RPC layer.
4646  *
4647  * In the case of WRITE, we also want to put the GETATTR after
4648  * the operation -- in this case because we want to make sure
4649  * we get the post-operation mtime and size.
4650  *
4651  * Both of these changes to the XDR layer would in fact be quite
4652  * minor, but I decided to leave them for a subsequent patch.
4653  */
4654 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4655                 unsigned int pgbase, unsigned int pglen)
4656 {
4657         struct nfs4_readlink args = {
4658                 .fh       = NFS_FH(inode),
4659                 .pgbase   = pgbase,
4660                 .pglen    = pglen,
4661                 .pages    = &page,
4662         };
4663         struct nfs4_readlink_res res;
4664         struct rpc_message msg = {
4665                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4666                 .rpc_argp = &args,
4667                 .rpc_resp = &res,
4668         };
4669
4670         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4671 }
4672
4673 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4674                 unsigned int pgbase, unsigned int pglen)
4675 {
4676         struct nfs4_exception exception = {
4677                 .interruptible = true,
4678         };
4679         int err;
4680         do {
4681                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4682                 trace_nfs4_readlink(inode, err);
4683                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4684                                 &exception);
4685         } while (exception.retry);
4686         return err;
4687 }
4688
4689 /*
4690  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4691  */
4692 static int
4693 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4694                  int flags)
4695 {
4696         struct nfs_server *server = NFS_SERVER(dir);
4697         struct nfs4_label l, *ilabel;
4698         struct nfs_open_context *ctx;
4699         struct nfs4_state *state;
4700         int status = 0;
4701
4702         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4703         if (IS_ERR(ctx))
4704                 return PTR_ERR(ctx);
4705
4706         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4707
4708         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4709                 sattr->ia_mode &= ~current_umask();
4710         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4711         if (IS_ERR(state)) {
4712                 status = PTR_ERR(state);
4713                 goto out;
4714         }
4715 out:
4716         nfs4_label_release_security(ilabel);
4717         put_nfs_open_context(ctx);
4718         return status;
4719 }
4720
4721 static int
4722 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4723 {
4724         struct nfs_server *server = NFS_SERVER(dir);
4725         struct nfs_removeargs args = {
4726                 .fh = NFS_FH(dir),
4727                 .name = *name,
4728         };
4729         struct nfs_removeres res = {
4730                 .server = server,
4731         };
4732         struct rpc_message msg = {
4733                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4734                 .rpc_argp = &args,
4735                 .rpc_resp = &res,
4736         };
4737         unsigned long timestamp = jiffies;
4738         int status;
4739
4740         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4741         if (status == 0) {
4742                 spin_lock(&dir->i_lock);
4743                 /* Removing a directory decrements nlink in the parent */
4744                 if (ftype == NF4DIR && dir->i_nlink > 2)
4745                         nfs4_dec_nlink_locked(dir);
4746                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4747                                               NFS_INO_INVALID_DATA);
4748                 spin_unlock(&dir->i_lock);
4749         }
4750         return status;
4751 }
4752
4753 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4754 {
4755         struct nfs4_exception exception = {
4756                 .interruptible = true,
4757         };
4758         struct inode *inode = d_inode(dentry);
4759         int err;
4760
4761         if (inode) {
4762                 if (inode->i_nlink == 1)
4763                         nfs4_inode_return_delegation(inode);
4764                 else
4765                         nfs4_inode_make_writeable(inode);
4766         }
4767         do {
4768                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4769                 trace_nfs4_remove(dir, &dentry->d_name, err);
4770                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4771                                 &exception);
4772         } while (exception.retry);
4773         return err;
4774 }
4775
4776 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4777 {
4778         struct nfs4_exception exception = {
4779                 .interruptible = true,
4780         };
4781         int err;
4782
4783         do {
4784                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4785                 trace_nfs4_remove(dir, name, err);
4786                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4787                                 &exception);
4788         } while (exception.retry);
4789         return err;
4790 }
4791
4792 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4793                 struct dentry *dentry,
4794                 struct inode *inode)
4795 {
4796         struct nfs_removeargs *args = msg->rpc_argp;
4797         struct nfs_removeres *res = msg->rpc_resp;
4798
4799         res->server = NFS_SB(dentry->d_sb);
4800         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4801         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4802
4803         nfs_fattr_init(res->dir_attr);
4804
4805         if (inode) {
4806                 nfs4_inode_return_delegation(inode);
4807                 nfs_d_prune_case_insensitive_aliases(inode);
4808         }
4809 }
4810
4811 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4812 {
4813         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4814                         &data->args.seq_args,
4815                         &data->res.seq_res,
4816                         task);
4817 }
4818
4819 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4820 {
4821         struct nfs_unlinkdata *data = task->tk_calldata;
4822         struct nfs_removeres *res = &data->res;
4823
4824         if (!nfs4_sequence_done(task, &res->seq_res))
4825                 return 0;
4826         if (nfs4_async_handle_error(task, res->server, NULL,
4827                                     &data->timeout) == -EAGAIN)
4828                 return 0;
4829         if (task->tk_status == 0)
4830                 nfs4_update_changeattr(dir, &res->cinfo,
4831                                 res->dir_attr->time_start,
4832                                 NFS_INO_INVALID_DATA);
4833         return 1;
4834 }
4835
4836 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4837                 struct dentry *old_dentry,
4838                 struct dentry *new_dentry)
4839 {
4840         struct nfs_renameargs *arg = msg->rpc_argp;
4841         struct nfs_renameres *res = msg->rpc_resp;
4842         struct inode *old_inode = d_inode(old_dentry);
4843         struct inode *new_inode = d_inode(new_dentry);
4844
4845         if (old_inode)
4846                 nfs4_inode_make_writeable(old_inode);
4847         if (new_inode)
4848                 nfs4_inode_return_delegation(new_inode);
4849         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4850         res->server = NFS_SB(old_dentry->d_sb);
4851         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4852 }
4853
4854 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4855 {
4856         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4857                         &data->args.seq_args,
4858                         &data->res.seq_res,
4859                         task);
4860 }
4861
4862 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4863                                  struct inode *new_dir)
4864 {
4865         struct nfs_renamedata *data = task->tk_calldata;
4866         struct nfs_renameres *res = &data->res;
4867
4868         if (!nfs4_sequence_done(task, &res->seq_res))
4869                 return 0;
4870         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4871                 return 0;
4872
4873         if (task->tk_status == 0) {
4874                 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4875                 if (new_dir != old_dir) {
4876                         /* Note: If we moved a directory, nlink will change */
4877                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4878                                         res->old_fattr->time_start,
4879                                         NFS_INO_INVALID_NLINK |
4880                                             NFS_INO_INVALID_DATA);
4881                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4882                                         res->new_fattr->time_start,
4883                                         NFS_INO_INVALID_NLINK |
4884                                             NFS_INO_INVALID_DATA);
4885                 } else
4886                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4887                                         res->old_fattr->time_start,
4888                                         NFS_INO_INVALID_DATA);
4889         }
4890         return 1;
4891 }
4892
4893 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4894 {
4895         struct nfs_server *server = NFS_SERVER(inode);
4896         __u32 bitmask[NFS4_BITMASK_SZ];
4897         struct nfs4_link_arg arg = {
4898                 .fh     = NFS_FH(inode),
4899                 .dir_fh = NFS_FH(dir),
4900                 .name   = name,
4901                 .bitmask = bitmask,
4902         };
4903         struct nfs4_link_res res = {
4904                 .server = server,
4905         };
4906         struct rpc_message msg = {
4907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4908                 .rpc_argp = &arg,
4909                 .rpc_resp = &res,
4910         };
4911         int status = -ENOMEM;
4912
4913         res.fattr = nfs_alloc_fattr_with_label(server);
4914         if (res.fattr == NULL)
4915                 goto out;
4916
4917         nfs4_inode_make_writeable(inode);
4918         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4919                                 NFS_INO_INVALID_CHANGE);
4920         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4921         if (!status) {
4922                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4923                                        NFS_INO_INVALID_DATA);
4924                 nfs4_inc_nlink(inode);
4925                 status = nfs_post_op_update_inode(inode, res.fattr);
4926                 if (!status)
4927                         nfs_setsecurity(inode, res.fattr);
4928         }
4929
4930 out:
4931         nfs_free_fattr(res.fattr);
4932         return status;
4933 }
4934
4935 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4936 {
4937         struct nfs4_exception exception = {
4938                 .interruptible = true,
4939         };
4940         int err;
4941         do {
4942                 err = nfs4_handle_exception(NFS_SERVER(inode),
4943                                 _nfs4_proc_link(inode, dir, name),
4944                                 &exception);
4945         } while (exception.retry);
4946         return err;
4947 }
4948
4949 struct nfs4_createdata {
4950         struct rpc_message msg;
4951         struct nfs4_create_arg arg;
4952         struct nfs4_create_res res;
4953         struct nfs_fh fh;
4954         struct nfs_fattr fattr;
4955 };
4956
4957 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4958                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4959 {
4960         struct nfs4_createdata *data;
4961
4962         data = kzalloc(sizeof(*data), GFP_KERNEL);
4963         if (data != NULL) {
4964                 struct nfs_server *server = NFS_SERVER(dir);
4965
4966                 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4967                 if (IS_ERR(data->fattr.label))
4968                         goto out_free;
4969
4970                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4971                 data->msg.rpc_argp = &data->arg;
4972                 data->msg.rpc_resp = &data->res;
4973                 data->arg.dir_fh = NFS_FH(dir);
4974                 data->arg.server = server;
4975                 data->arg.name = name;
4976                 data->arg.attrs = sattr;
4977                 data->arg.ftype = ftype;
4978                 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
4979                 data->arg.umask = current_umask();
4980                 data->res.server = server;
4981                 data->res.fh = &data->fh;
4982                 data->res.fattr = &data->fattr;
4983                 nfs_fattr_init(data->res.fattr);
4984         }
4985         return data;
4986 out_free:
4987         kfree(data);
4988         return NULL;
4989 }
4990
4991 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4992 {
4993         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4994                                     &data->arg.seq_args, &data->res.seq_res, 1);
4995         if (status == 0) {
4996                 spin_lock(&dir->i_lock);
4997                 /* Creating a directory bumps nlink in the parent */
4998                 if (data->arg.ftype == NF4DIR)
4999                         nfs4_inc_nlink_locked(dir);
5000                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5001                                               data->res.fattr->time_start,
5002                                               NFS_INO_INVALID_DATA);
5003                 spin_unlock(&dir->i_lock);
5004                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5005         }
5006         return status;
5007 }
5008
5009 static void nfs4_free_createdata(struct nfs4_createdata *data)
5010 {
5011         nfs4_label_free(data->fattr.label);
5012         kfree(data);
5013 }
5014
5015 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5016                 struct page *page, unsigned int len, struct iattr *sattr,
5017                 struct nfs4_label *label)
5018 {
5019         struct nfs4_createdata *data;
5020         int status = -ENAMETOOLONG;
5021
5022         if (len > NFS4_MAXPATHLEN)
5023                 goto out;
5024
5025         status = -ENOMEM;
5026         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5027         if (data == NULL)
5028                 goto out;
5029
5030         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5031         data->arg.u.symlink.pages = &page;
5032         data->arg.u.symlink.len = len;
5033         data->arg.label = label;
5034
5035         status = nfs4_do_create(dir, dentry, data);
5036
5037         nfs4_free_createdata(data);
5038 out:
5039         return status;
5040 }
5041
5042 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5043                 struct page *page, unsigned int len, struct iattr *sattr)
5044 {
5045         struct nfs4_exception exception = {
5046                 .interruptible = true,
5047         };
5048         struct nfs4_label l, *label;
5049         int err;
5050
5051         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5052
5053         do {
5054                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
5055                 trace_nfs4_symlink(dir, &dentry->d_name, err);
5056                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5057                                 &exception);
5058         } while (exception.retry);
5059
5060         nfs4_label_release_security(label);
5061         return err;
5062 }
5063
5064 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5065                 struct iattr *sattr, struct nfs4_label *label)
5066 {
5067         struct nfs4_createdata *data;
5068         int status = -ENOMEM;
5069
5070         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5071         if (data == NULL)
5072                 goto out;
5073
5074         data->arg.label = label;
5075         status = nfs4_do_create(dir, dentry, data);
5076
5077         nfs4_free_createdata(data);
5078 out:
5079         return status;
5080 }
5081
5082 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5083                 struct iattr *sattr)
5084 {
5085         struct nfs_server *server = NFS_SERVER(dir);
5086         struct nfs4_exception exception = {
5087                 .interruptible = true,
5088         };
5089         struct nfs4_label l, *label;
5090         int err;
5091
5092         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5093
5094         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5095                 sattr->ia_mode &= ~current_umask();
5096         do {
5097                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5098                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5099                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5100                                 &exception);
5101         } while (exception.retry);
5102         nfs4_label_release_security(label);
5103
5104         return err;
5105 }
5106
5107 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5108                               struct nfs_readdir_res *nr_res)
5109 {
5110         struct inode            *dir = d_inode(nr_arg->dentry);
5111         struct nfs_server       *server = NFS_SERVER(dir);
5112         struct nfs4_readdir_arg args = {
5113                 .fh = NFS_FH(dir),
5114                 .pages = nr_arg->pages,
5115                 .pgbase = 0,
5116                 .count = nr_arg->page_len,
5117                 .plus = nr_arg->plus,
5118         };
5119         struct nfs4_readdir_res res;
5120         struct rpc_message msg = {
5121                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5122                 .rpc_argp = &args,
5123                 .rpc_resp = &res,
5124                 .rpc_cred = nr_arg->cred,
5125         };
5126         int                     status;
5127
5128         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5129                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5130         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5131                 args.bitmask = server->attr_bitmask_nl;
5132         else
5133                 args.bitmask = server->attr_bitmask;
5134
5135         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5136         res.pgbase = args.pgbase;
5137         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5138                         &res.seq_res, 0);
5139         if (status >= 0) {
5140                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5141                 status += args.pgbase;
5142         }
5143
5144         nfs_invalidate_atime(dir);
5145
5146         dprintk("%s: returns %d\n", __func__, status);
5147         return status;
5148 }
5149
5150 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5151                              struct nfs_readdir_res *res)
5152 {
5153         struct nfs4_exception exception = {
5154                 .interruptible = true,
5155         };
5156         int err;
5157         do {
5158                 err = _nfs4_proc_readdir(arg, res);
5159                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5160                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5161                                             err, &exception);
5162         } while (exception.retry);
5163         return err;
5164 }
5165
5166 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5167                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5168 {
5169         struct nfs4_createdata *data;
5170         int mode = sattr->ia_mode;
5171         int status = -ENOMEM;
5172
5173         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5174         if (data == NULL)
5175                 goto out;
5176
5177         if (S_ISFIFO(mode))
5178                 data->arg.ftype = NF4FIFO;
5179         else if (S_ISBLK(mode)) {
5180                 data->arg.ftype = NF4BLK;
5181                 data->arg.u.device.specdata1 = MAJOR(rdev);
5182                 data->arg.u.device.specdata2 = MINOR(rdev);
5183         }
5184         else if (S_ISCHR(mode)) {
5185                 data->arg.ftype = NF4CHR;
5186                 data->arg.u.device.specdata1 = MAJOR(rdev);
5187                 data->arg.u.device.specdata2 = MINOR(rdev);
5188         } else if (!S_ISSOCK(mode)) {
5189                 status = -EINVAL;
5190                 goto out_free;
5191         }
5192
5193         data->arg.label = label;
5194         status = nfs4_do_create(dir, dentry, data);
5195 out_free:
5196         nfs4_free_createdata(data);
5197 out:
5198         return status;
5199 }
5200
5201 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5202                 struct iattr *sattr, dev_t rdev)
5203 {
5204         struct nfs_server *server = NFS_SERVER(dir);
5205         struct nfs4_exception exception = {
5206                 .interruptible = true,
5207         };
5208         struct nfs4_label l, *label;
5209         int err;
5210
5211         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5212
5213         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5214                 sattr->ia_mode &= ~current_umask();
5215         do {
5216                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5217                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5218                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5219                                 &exception);
5220         } while (exception.retry);
5221
5222         nfs4_label_release_security(label);
5223
5224         return err;
5225 }
5226
5227 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5228                  struct nfs_fsstat *fsstat)
5229 {
5230         struct nfs4_statfs_arg args = {
5231                 .fh = fhandle,
5232                 .bitmask = server->attr_bitmask,
5233         };
5234         struct nfs4_statfs_res res = {
5235                 .fsstat = fsstat,
5236         };
5237         struct rpc_message msg = {
5238                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5239                 .rpc_argp = &args,
5240                 .rpc_resp = &res,
5241         };
5242
5243         nfs_fattr_init(fsstat->fattr);
5244         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5245 }
5246
5247 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5248 {
5249         struct nfs4_exception exception = {
5250                 .interruptible = true,
5251         };
5252         int err;
5253         do {
5254                 err = nfs4_handle_exception(server,
5255                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5256                                 &exception);
5257         } while (exception.retry);
5258         return err;
5259 }
5260
5261 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5262                 struct nfs_fsinfo *fsinfo)
5263 {
5264         struct nfs4_fsinfo_arg args = {
5265                 .fh = fhandle,
5266                 .bitmask = server->attr_bitmask,
5267         };
5268         struct nfs4_fsinfo_res res = {
5269                 .fsinfo = fsinfo,
5270         };
5271         struct rpc_message msg = {
5272                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5273                 .rpc_argp = &args,
5274                 .rpc_resp = &res,
5275         };
5276
5277         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5278 }
5279
5280 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5281 {
5282         struct nfs4_exception exception = {
5283                 .interruptible = true,
5284         };
5285         int err;
5286
5287         do {
5288                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5289                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5290                 if (err == 0) {
5291                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5292                         break;
5293                 }
5294                 err = nfs4_handle_exception(server, err, &exception);
5295         } while (exception.retry);
5296         return err;
5297 }
5298
5299 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5300 {
5301         int error;
5302
5303         nfs_fattr_init(fsinfo->fattr);
5304         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5305         if (error == 0) {
5306                 /* block layout checks this! */
5307                 server->pnfs_blksize = fsinfo->blksize;
5308                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5309         }
5310
5311         return error;
5312 }
5313
5314 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5315                 struct nfs_pathconf *pathconf)
5316 {
5317         struct nfs4_pathconf_arg args = {
5318                 .fh = fhandle,
5319                 .bitmask = server->attr_bitmask,
5320         };
5321         struct nfs4_pathconf_res res = {
5322                 .pathconf = pathconf,
5323         };
5324         struct rpc_message msg = {
5325                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5326                 .rpc_argp = &args,
5327                 .rpc_resp = &res,
5328         };
5329
5330         /* None of the pathconf attributes are mandatory to implement */
5331         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5332                 memset(pathconf, 0, sizeof(*pathconf));
5333                 return 0;
5334         }
5335
5336         nfs_fattr_init(pathconf->fattr);
5337         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5338 }
5339
5340 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5341                 struct nfs_pathconf *pathconf)
5342 {
5343         struct nfs4_exception exception = {
5344                 .interruptible = true,
5345         };
5346         int err;
5347
5348         do {
5349                 err = nfs4_handle_exception(server,
5350                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5351                                 &exception);
5352         } while (exception.retry);
5353         return err;
5354 }
5355
5356 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5357                 const struct nfs_open_context *ctx,
5358                 const struct nfs_lock_context *l_ctx,
5359                 fmode_t fmode)
5360 {
5361         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5362 }
5363 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5364
5365 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5366                 const struct nfs_open_context *ctx,
5367                 const struct nfs_lock_context *l_ctx,
5368                 fmode_t fmode)
5369 {
5370         nfs4_stateid _current_stateid;
5371
5372         /* If the current stateid represents a lost lock, then exit */
5373         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5374                 return true;
5375         return nfs4_stateid_match(stateid, &_current_stateid);
5376 }
5377
5378 static bool nfs4_error_stateid_expired(int err)
5379 {
5380         switch (err) {
5381         case -NFS4ERR_DELEG_REVOKED:
5382         case -NFS4ERR_ADMIN_REVOKED:
5383         case -NFS4ERR_BAD_STATEID:
5384         case -NFS4ERR_STALE_STATEID:
5385         case -NFS4ERR_OLD_STATEID:
5386         case -NFS4ERR_OPENMODE:
5387         case -NFS4ERR_EXPIRED:
5388                 return true;
5389         }
5390         return false;
5391 }
5392
5393 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5394 {
5395         struct nfs_server *server = NFS_SERVER(hdr->inode);
5396
5397         trace_nfs4_read(hdr, task->tk_status);
5398         if (task->tk_status < 0) {
5399                 struct nfs4_exception exception = {
5400                         .inode = hdr->inode,
5401                         .state = hdr->args.context->state,
5402                         .stateid = &hdr->args.stateid,
5403                 };
5404                 task->tk_status = nfs4_async_handle_exception(task,
5405                                 server, task->tk_status, &exception);
5406                 if (exception.retry) {
5407                         rpc_restart_call_prepare(task);
5408                         return -EAGAIN;
5409                 }
5410         }
5411
5412         if (task->tk_status > 0)
5413                 renew_lease(server, hdr->timestamp);
5414         return 0;
5415 }
5416
5417 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5418                 struct nfs_pgio_args *args)
5419 {
5420
5421         if (!nfs4_error_stateid_expired(task->tk_status) ||
5422                 nfs4_stateid_is_current(&args->stateid,
5423                                 args->context,
5424                                 args->lock_context,
5425                                 FMODE_READ))
5426                 return false;
5427         rpc_restart_call_prepare(task);
5428         return true;
5429 }
5430
5431 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5432                                          struct nfs_pgio_header *hdr)
5433 {
5434         struct nfs_server *server = NFS_SERVER(hdr->inode);
5435         struct rpc_message *msg = &task->tk_msg;
5436
5437         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5438             server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5439                 server->caps &= ~NFS_CAP_READ_PLUS;
5440                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5441                 rpc_restart_call_prepare(task);
5442                 return true;
5443         }
5444         return false;
5445 }
5446
5447 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5448 {
5449         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5450                 return -EAGAIN;
5451         if (nfs4_read_stateid_changed(task, &hdr->args))
5452                 return -EAGAIN;
5453         if (nfs4_read_plus_not_supported(task, hdr))
5454                 return -EAGAIN;
5455         if (task->tk_status > 0)
5456                 nfs_invalidate_atime(hdr->inode);
5457         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5458                                     nfs4_read_done_cb(task, hdr);
5459 }
5460
5461 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5462 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5463                                     struct rpc_message *msg)
5464 {
5465         /* Note: We don't use READ_PLUS with pNFS yet */
5466         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5467                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5468                 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5469         }
5470         return false;
5471 }
5472 #else
5473 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5474                                     struct rpc_message *msg)
5475 {
5476         return false;
5477 }
5478 #endif /* CONFIG_NFS_V4_2 */
5479
5480 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5481                                  struct rpc_message *msg)
5482 {
5483         hdr->timestamp   = jiffies;
5484         if (!hdr->pgio_done_cb)
5485                 hdr->pgio_done_cb = nfs4_read_done_cb;
5486         if (!nfs42_read_plus_support(hdr, msg))
5487                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5488         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5489 }
5490
5491 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5492                                       struct nfs_pgio_header *hdr)
5493 {
5494         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5495                         &hdr->args.seq_args,
5496                         &hdr->res.seq_res,
5497                         task))
5498                 return 0;
5499         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5500                                 hdr->args.lock_context,
5501                                 hdr->rw_mode) == -EIO)
5502                 return -EIO;
5503         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5504                 return -EIO;
5505         return 0;
5506 }
5507
5508 static int nfs4_write_done_cb(struct rpc_task *task,
5509                               struct nfs_pgio_header *hdr)
5510 {
5511         struct inode *inode = hdr->inode;
5512
5513         trace_nfs4_write(hdr, task->tk_status);
5514         if (task->tk_status < 0) {
5515                 struct nfs4_exception exception = {
5516                         .inode = hdr->inode,
5517                         .state = hdr->args.context->state,
5518                         .stateid = &hdr->args.stateid,
5519                 };
5520                 task->tk_status = nfs4_async_handle_exception(task,
5521                                 NFS_SERVER(inode), task->tk_status,
5522                                 &exception);
5523                 if (exception.retry) {
5524                         rpc_restart_call_prepare(task);
5525                         return -EAGAIN;
5526                 }
5527         }
5528         if (task->tk_status >= 0) {
5529                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5530                 nfs_writeback_update_inode(hdr);
5531         }
5532         return 0;
5533 }
5534
5535 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5536                 struct nfs_pgio_args *args)
5537 {
5538
5539         if (!nfs4_error_stateid_expired(task->tk_status) ||
5540                 nfs4_stateid_is_current(&args->stateid,
5541                                 args->context,
5542                                 args->lock_context,
5543                                 FMODE_WRITE))
5544                 return false;
5545         rpc_restart_call_prepare(task);
5546         return true;
5547 }
5548
5549 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5550 {
5551         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5552                 return -EAGAIN;
5553         if (nfs4_write_stateid_changed(task, &hdr->args))
5554                 return -EAGAIN;
5555         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5556                 nfs4_write_done_cb(task, hdr);
5557 }
5558
5559 static
5560 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5561 {
5562         /* Don't request attributes for pNFS or O_DIRECT writes */
5563         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5564                 return false;
5565         /* Otherwise, request attributes if and only if we don't hold
5566          * a delegation
5567          */
5568         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5569 }
5570
5571 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5572                       struct inode *inode, unsigned long cache_validity)
5573 {
5574         struct nfs_server *server = NFS_SERVER(inode);
5575         unsigned int i;
5576
5577         memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5578         cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5579
5580         if (cache_validity & NFS_INO_INVALID_CHANGE)
5581                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5582         if (cache_validity & NFS_INO_INVALID_ATIME)
5583                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5584         if (cache_validity & NFS_INO_INVALID_MODE)
5585                 bitmask[1] |= FATTR4_WORD1_MODE;
5586         if (cache_validity & NFS_INO_INVALID_OTHER)
5587                 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5588         if (cache_validity & NFS_INO_INVALID_NLINK)
5589                 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5590         if (cache_validity & NFS_INO_INVALID_CTIME)
5591                 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5592         if (cache_validity & NFS_INO_INVALID_MTIME)
5593                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5594         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5595                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5596
5597         if (cache_validity & NFS_INO_INVALID_SIZE)
5598                 bitmask[0] |= FATTR4_WORD0_SIZE;
5599
5600         for (i = 0; i < NFS4_BITMASK_SZ; i++)
5601                 bitmask[i] &= server->attr_bitmask[i];
5602 }
5603
5604 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5605                                   struct rpc_message *msg,
5606                                   struct rpc_clnt **clnt)
5607 {
5608         struct nfs_server *server = NFS_SERVER(hdr->inode);
5609
5610         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5611                 hdr->args.bitmask = NULL;
5612                 hdr->res.fattr = NULL;
5613         } else {
5614                 nfs4_bitmask_set(hdr->args.bitmask_store,
5615                                  server->cache_consistency_bitmask,
5616                                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5617                 hdr->args.bitmask = hdr->args.bitmask_store;
5618         }
5619
5620         if (!hdr->pgio_done_cb)
5621                 hdr->pgio_done_cb = nfs4_write_done_cb;
5622         hdr->res.server = server;
5623         hdr->timestamp   = jiffies;
5624
5625         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5626         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5627         nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5628 }
5629
5630 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5631 {
5632         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5633                         &data->args.seq_args,
5634                         &data->res.seq_res,
5635                         task);
5636 }
5637
5638 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5639 {
5640         struct inode *inode = data->inode;
5641
5642         trace_nfs4_commit(data, task->tk_status);
5643         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5644                                     NULL, NULL) == -EAGAIN) {
5645                 rpc_restart_call_prepare(task);
5646                 return -EAGAIN;
5647         }
5648         return 0;
5649 }
5650
5651 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5652 {
5653         if (!nfs4_sequence_done(task, &data->res.seq_res))
5654                 return -EAGAIN;
5655         return data->commit_done_cb(task, data);
5656 }
5657
5658 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5659                                    struct rpc_clnt **clnt)
5660 {
5661         struct nfs_server *server = NFS_SERVER(data->inode);
5662
5663         if (data->commit_done_cb == NULL)
5664                 data->commit_done_cb = nfs4_commit_done_cb;
5665         data->res.server = server;
5666         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5667         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5668         nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5669                         NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5670 }
5671
5672 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5673                                 struct nfs_commitres *res)
5674 {
5675         struct inode *dst_inode = file_inode(dst);
5676         struct nfs_server *server = NFS_SERVER(dst_inode);
5677         struct rpc_message msg = {
5678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5679                 .rpc_argp = args,
5680                 .rpc_resp = res,
5681         };
5682
5683         args->fh = NFS_FH(dst_inode);
5684         return nfs4_call_sync(server->client, server, &msg,
5685                         &args->seq_args, &res->seq_res, 1);
5686 }
5687
5688 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5689 {
5690         struct nfs_commitargs args = {
5691                 .offset = offset,
5692                 .count = count,
5693         };
5694         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5695         struct nfs4_exception exception = { };
5696         int status;
5697
5698         do {
5699                 status = _nfs4_proc_commit(dst, &args, res);
5700                 status = nfs4_handle_exception(dst_server, status, &exception);
5701         } while (exception.retry);
5702
5703         return status;
5704 }
5705
5706 struct nfs4_renewdata {
5707         struct nfs_client       *client;
5708         unsigned long           timestamp;
5709 };
5710
5711 /*
5712  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5713  * standalone procedure for queueing an asynchronous RENEW.
5714  */
5715 static void nfs4_renew_release(void *calldata)
5716 {
5717         struct nfs4_renewdata *data = calldata;
5718         struct nfs_client *clp = data->client;
5719
5720         if (refcount_read(&clp->cl_count) > 1)
5721                 nfs4_schedule_state_renewal(clp);
5722         nfs_put_client(clp);
5723         kfree(data);
5724 }
5725
5726 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5727 {
5728         struct nfs4_renewdata *data = calldata;
5729         struct nfs_client *clp = data->client;
5730         unsigned long timestamp = data->timestamp;
5731
5732         trace_nfs4_renew_async(clp, task->tk_status);
5733         switch (task->tk_status) {
5734         case 0:
5735                 break;
5736         case -NFS4ERR_LEASE_MOVED:
5737                 nfs4_schedule_lease_moved_recovery(clp);
5738                 break;
5739         default:
5740                 /* Unless we're shutting down, schedule state recovery! */
5741                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5742                         return;
5743                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5744                         nfs4_schedule_lease_recovery(clp);
5745                         return;
5746                 }
5747                 nfs4_schedule_path_down_recovery(clp);
5748         }
5749         do_renew_lease(clp, timestamp);
5750 }
5751
5752 static const struct rpc_call_ops nfs4_renew_ops = {
5753         .rpc_call_done = nfs4_renew_done,
5754         .rpc_release = nfs4_renew_release,
5755 };
5756
5757 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5758 {
5759         struct rpc_message msg = {
5760                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5761                 .rpc_argp       = clp,
5762                 .rpc_cred       = cred,
5763         };
5764         struct nfs4_renewdata *data;
5765
5766         if (renew_flags == 0)
5767                 return 0;
5768         if (!refcount_inc_not_zero(&clp->cl_count))
5769                 return -EIO;
5770         data = kmalloc(sizeof(*data), GFP_NOFS);
5771         if (data == NULL) {
5772                 nfs_put_client(clp);
5773                 return -ENOMEM;
5774         }
5775         data->client = clp;
5776         data->timestamp = jiffies;
5777         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5778                         &nfs4_renew_ops, data);
5779 }
5780
5781 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5782 {
5783         struct rpc_message msg = {
5784                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5785                 .rpc_argp       = clp,
5786                 .rpc_cred       = cred,
5787         };
5788         unsigned long now = jiffies;
5789         int status;
5790
5791         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5792         if (status < 0)
5793                 return status;
5794         do_renew_lease(clp, now);
5795         return 0;
5796 }
5797
5798 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5799                                       enum nfs4_acl_type type)
5800 {
5801         switch (type) {
5802         default:
5803                 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5804         case NFS4ACL_DACL:
5805                 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5806         case NFS4ACL_SACL:
5807                 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5808         }
5809 }
5810
5811 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5812  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5813  * the stack.
5814  */
5815 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5816
5817 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5818                 struct page **pages)
5819 {
5820         struct page *newpage, **spages;
5821         int rc = 0;
5822         size_t len;
5823         spages = pages;
5824
5825         do {
5826                 len = min_t(size_t, PAGE_SIZE, buflen);
5827                 newpage = alloc_page(GFP_KERNEL);
5828
5829                 if (newpage == NULL)
5830                         goto unwind;
5831                 memcpy(page_address(newpage), buf, len);
5832                 buf += len;
5833                 buflen -= len;
5834                 *pages++ = newpage;
5835                 rc++;
5836         } while (buflen != 0);
5837
5838         return rc;
5839
5840 unwind:
5841         for(; rc > 0; rc--)
5842                 __free_page(spages[rc-1]);
5843         return -ENOMEM;
5844 }
5845
5846 struct nfs4_cached_acl {
5847         enum nfs4_acl_type type;
5848         int cached;
5849         size_t len;
5850         char data[];
5851 };
5852
5853 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5854 {
5855         struct nfs_inode *nfsi = NFS_I(inode);
5856
5857         spin_lock(&inode->i_lock);
5858         kfree(nfsi->nfs4_acl);
5859         nfsi->nfs4_acl = acl;
5860         spin_unlock(&inode->i_lock);
5861 }
5862
5863 static void nfs4_zap_acl_attr(struct inode *inode)
5864 {
5865         nfs4_set_cached_acl(inode, NULL);
5866 }
5867
5868 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5869                                     size_t buflen, enum nfs4_acl_type type)
5870 {
5871         struct nfs_inode *nfsi = NFS_I(inode);
5872         struct nfs4_cached_acl *acl;
5873         int ret = -ENOENT;
5874
5875         spin_lock(&inode->i_lock);
5876         acl = nfsi->nfs4_acl;
5877         if (acl == NULL)
5878                 goto out;
5879         if (acl->type != type)
5880                 goto out;
5881         if (buf == NULL) /* user is just asking for length */
5882                 goto out_len;
5883         if (acl->cached == 0)
5884                 goto out;
5885         ret = -ERANGE; /* see getxattr(2) man page */
5886         if (acl->len > buflen)
5887                 goto out;
5888         memcpy(buf, acl->data, acl->len);
5889 out_len:
5890         ret = acl->len;
5891 out:
5892         spin_unlock(&inode->i_lock);
5893         return ret;
5894 }
5895
5896 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5897                                   size_t pgbase, size_t acl_len,
5898                                   enum nfs4_acl_type type)
5899 {
5900         struct nfs4_cached_acl *acl;
5901         size_t buflen = sizeof(*acl) + acl_len;
5902
5903         if (buflen <= PAGE_SIZE) {
5904                 acl = kmalloc(buflen, GFP_KERNEL);
5905                 if (acl == NULL)
5906                         goto out;
5907                 acl->cached = 1;
5908                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5909         } else {
5910                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5911                 if (acl == NULL)
5912                         goto out;
5913                 acl->cached = 0;
5914         }
5915         acl->type = type;
5916         acl->len = acl_len;
5917 out:
5918         nfs4_set_cached_acl(inode, acl);
5919 }
5920
5921 /*
5922  * The getxattr API returns the required buffer length when called with a
5923  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5924  * the required buf.  On a NULL buf, we send a page of data to the server
5925  * guessing that the ACL request can be serviced by a page. If so, we cache
5926  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5927  * the cache. If not so, we throw away the page, and cache the required
5928  * length. The next getxattr call will then produce another round trip to
5929  * the server, this time with the input buf of the required size.
5930  */
5931 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5932                                        size_t buflen, enum nfs4_acl_type type)
5933 {
5934         struct page **pages;
5935         struct nfs_getaclargs args = {
5936                 .fh = NFS_FH(inode),
5937                 .acl_type = type,
5938                 .acl_len = buflen,
5939         };
5940         struct nfs_getaclres res = {
5941                 .acl_type = type,
5942                 .acl_len = buflen,
5943         };
5944         struct rpc_message msg = {
5945                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5946                 .rpc_argp = &args,
5947                 .rpc_resp = &res,
5948         };
5949         unsigned int npages;
5950         int ret = -ENOMEM, i;
5951         struct nfs_server *server = NFS_SERVER(inode);
5952
5953         if (buflen == 0)
5954                 buflen = server->rsize;
5955
5956         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5957         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5958         if (!pages)
5959                 return -ENOMEM;
5960
5961         args.acl_pages = pages;
5962
5963         for (i = 0; i < npages; i++) {
5964                 pages[i] = alloc_page(GFP_KERNEL);
5965                 if (!pages[i])
5966                         goto out_free;
5967         }
5968
5969         /* for decoding across pages */
5970         res.acl_scratch = alloc_page(GFP_KERNEL);
5971         if (!res.acl_scratch)
5972                 goto out_free;
5973
5974         args.acl_len = npages * PAGE_SIZE;
5975
5976         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5977                 __func__, buf, buflen, npages, args.acl_len);
5978         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5979                              &msg, &args.seq_args, &res.seq_res, 0);
5980         if (ret)
5981                 goto out_free;
5982
5983         /* Handle the case where the passed-in buffer is too short */
5984         if (res.acl_flags & NFS4_ACL_TRUNC) {
5985                 /* Did the user only issue a request for the acl length? */
5986                 if (buf == NULL)
5987                         goto out_ok;
5988                 ret = -ERANGE;
5989                 goto out_free;
5990         }
5991         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
5992                               type);
5993         if (buf) {
5994                 if (res.acl_len > buflen) {
5995                         ret = -ERANGE;
5996                         goto out_free;
5997                 }
5998                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5999         }
6000 out_ok:
6001         ret = res.acl_len;
6002 out_free:
6003         while (--i >= 0)
6004                 __free_page(pages[i]);
6005         if (res.acl_scratch)
6006                 __free_page(res.acl_scratch);
6007         kfree(pages);
6008         return ret;
6009 }
6010
6011 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6012                                      size_t buflen, enum nfs4_acl_type type)
6013 {
6014         struct nfs4_exception exception = {
6015                 .interruptible = true,
6016         };
6017         ssize_t ret;
6018         do {
6019                 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6020                 trace_nfs4_get_acl(inode, ret);
6021                 if (ret >= 0)
6022                         break;
6023                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6024         } while (exception.retry);
6025         return ret;
6026 }
6027
6028 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6029                                  enum nfs4_acl_type type)
6030 {
6031         struct nfs_server *server = NFS_SERVER(inode);
6032         int ret;
6033
6034         if (!nfs4_server_supports_acls(server, type))
6035                 return -EOPNOTSUPP;
6036         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6037         if (ret < 0)
6038                 return ret;
6039         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6040                 nfs_zap_acl_cache(inode);
6041         ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6042         if (ret != -ENOENT)
6043                 /* -ENOENT is returned if there is no ACL or if there is an ACL
6044                  * but no cached acl data, just the acl length */
6045                 return ret;
6046         return nfs4_get_acl_uncached(inode, buf, buflen, type);
6047 }
6048
6049 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6050                                size_t buflen, enum nfs4_acl_type type)
6051 {
6052         struct nfs_server *server = NFS_SERVER(inode);
6053         struct page *pages[NFS4ACL_MAXPAGES];
6054         struct nfs_setaclargs arg = {
6055                 .fh = NFS_FH(inode),
6056                 .acl_type = type,
6057                 .acl_len = buflen,
6058                 .acl_pages = pages,
6059         };
6060         struct nfs_setaclres res;
6061         struct rpc_message msg = {
6062                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6063                 .rpc_argp       = &arg,
6064                 .rpc_resp       = &res,
6065         };
6066         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6067         int ret, i;
6068
6069         /* You can't remove system.nfs4_acl: */
6070         if (buflen == 0)
6071                 return -EINVAL;
6072         if (!nfs4_server_supports_acls(server, type))
6073                 return -EOPNOTSUPP;
6074         if (npages > ARRAY_SIZE(pages))
6075                 return -ERANGE;
6076         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6077         if (i < 0)
6078                 return i;
6079         nfs4_inode_make_writeable(inode);
6080         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6081
6082         /*
6083          * Free each page after tx, so the only ref left is
6084          * held by the network stack
6085          */
6086         for (; i > 0; i--)
6087                 put_page(pages[i-1]);
6088
6089         /*
6090          * Acl update can result in inode attribute update.
6091          * so mark the attribute cache invalid.
6092          */
6093         spin_lock(&inode->i_lock);
6094         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6095                                              NFS_INO_INVALID_CTIME |
6096                                              NFS_INO_REVAL_FORCED);
6097         spin_unlock(&inode->i_lock);
6098         nfs_access_zap_cache(inode);
6099         nfs_zap_acl_cache(inode);
6100         return ret;
6101 }
6102
6103 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6104                              size_t buflen, enum nfs4_acl_type type)
6105 {
6106         struct nfs4_exception exception = { };
6107         int err;
6108         do {
6109                 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6110                 trace_nfs4_set_acl(inode, err);
6111                 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6112                         /*
6113                          * no need to retry since the kernel
6114                          * isn't involved in encoding the ACEs.
6115                          */
6116                         err = -EINVAL;
6117                         break;
6118                 }
6119                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6120                                 &exception);
6121         } while (exception.retry);
6122         return err;
6123 }
6124
6125 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6126 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6127                                         size_t buflen)
6128 {
6129         struct nfs_server *server = NFS_SERVER(inode);
6130         struct nfs4_label label = {0, 0, buflen, buf};
6131
6132         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6133         struct nfs_fattr fattr = {
6134                 .label = &label,
6135         };
6136         struct nfs4_getattr_arg arg = {
6137                 .fh             = NFS_FH(inode),
6138                 .bitmask        = bitmask,
6139         };
6140         struct nfs4_getattr_res res = {
6141                 .fattr          = &fattr,
6142                 .server         = server,
6143         };
6144         struct rpc_message msg = {
6145                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6146                 .rpc_argp       = &arg,
6147                 .rpc_resp       = &res,
6148         };
6149         int ret;
6150
6151         nfs_fattr_init(&fattr);
6152
6153         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6154         if (ret)
6155                 return ret;
6156         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6157                 return -ENOENT;
6158         return label.len;
6159 }
6160
6161 static int nfs4_get_security_label(struct inode *inode, void *buf,
6162                                         size_t buflen)
6163 {
6164         struct nfs4_exception exception = {
6165                 .interruptible = true,
6166         };
6167         int err;
6168
6169         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6170                 return -EOPNOTSUPP;
6171
6172         do {
6173                 err = _nfs4_get_security_label(inode, buf, buflen);
6174                 trace_nfs4_get_security_label(inode, err);
6175                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6176                                 &exception);
6177         } while (exception.retry);
6178         return err;
6179 }
6180
6181 static int _nfs4_do_set_security_label(struct inode *inode,
6182                 struct nfs4_label *ilabel,
6183                 struct nfs_fattr *fattr)
6184 {
6185
6186         struct iattr sattr = {0};
6187         struct nfs_server *server = NFS_SERVER(inode);
6188         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6189         struct nfs_setattrargs arg = {
6190                 .fh             = NFS_FH(inode),
6191                 .iap            = &sattr,
6192                 .server         = server,
6193                 .bitmask        = bitmask,
6194                 .label          = ilabel,
6195         };
6196         struct nfs_setattrres res = {
6197                 .fattr          = fattr,
6198                 .server         = server,
6199         };
6200         struct rpc_message msg = {
6201                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6202                 .rpc_argp       = &arg,
6203                 .rpc_resp       = &res,
6204         };
6205         int status;
6206
6207         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6208
6209         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6210         if (status)
6211                 dprintk("%s failed: %d\n", __func__, status);
6212
6213         return status;
6214 }
6215
6216 static int nfs4_do_set_security_label(struct inode *inode,
6217                 struct nfs4_label *ilabel,
6218                 struct nfs_fattr *fattr)
6219 {
6220         struct nfs4_exception exception = { };
6221         int err;
6222
6223         do {
6224                 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6225                 trace_nfs4_set_security_label(inode, err);
6226                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6227                                 &exception);
6228         } while (exception.retry);
6229         return err;
6230 }
6231
6232 static int
6233 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6234 {
6235         struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6236         struct nfs_fattr *fattr;
6237         int status;
6238
6239         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6240                 return -EOPNOTSUPP;
6241
6242         fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6243         if (fattr == NULL)
6244                 return -ENOMEM;
6245
6246         status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6247         if (status == 0)
6248                 nfs_setsecurity(inode, fattr);
6249
6250         return status;
6251 }
6252 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6253
6254
6255 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6256                                     nfs4_verifier *bootverf)
6257 {
6258         __be32 verf[2];
6259
6260         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6261                 /* An impossible timestamp guarantees this value
6262                  * will never match a generated boot time. */
6263                 verf[0] = cpu_to_be32(U32_MAX);
6264                 verf[1] = cpu_to_be32(U32_MAX);
6265         } else {
6266                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6267                 u64 ns = ktime_to_ns(nn->boot_time);
6268
6269                 verf[0] = cpu_to_be32(ns >> 32);
6270                 verf[1] = cpu_to_be32(ns);
6271         }
6272         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6273 }
6274
6275 static size_t
6276 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6277 {
6278         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6279         struct nfs_netns_client *nn_clp = nn->nfs_client;
6280         const char *id;
6281
6282         buf[0] = '\0';
6283
6284         if (nn_clp) {
6285                 rcu_read_lock();
6286                 id = rcu_dereference(nn_clp->identifier);
6287                 if (id)
6288                         strscpy(buf, id, buflen);
6289                 rcu_read_unlock();
6290         }
6291
6292         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6293                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6294
6295         return strlen(buf);
6296 }
6297
6298 static int
6299 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6300 {
6301         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6302         size_t buflen;
6303         size_t len;
6304         char *str;
6305
6306         if (clp->cl_owner_id != NULL)
6307                 return 0;
6308
6309         rcu_read_lock();
6310         len = 14 +
6311                 strlen(clp->cl_rpcclient->cl_nodename) +
6312                 1 +
6313                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6314                 1;
6315         rcu_read_unlock();
6316
6317         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6318         if (buflen)
6319                 len += buflen + 1;
6320
6321         if (len > NFS4_OPAQUE_LIMIT + 1)
6322                 return -EINVAL;
6323
6324         /*
6325          * Since this string is allocated at mount time, and held until the
6326          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6327          * about a memory-reclaim deadlock.
6328          */
6329         str = kmalloc(len, GFP_KERNEL);
6330         if (!str)
6331                 return -ENOMEM;
6332
6333         rcu_read_lock();
6334         if (buflen)
6335                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6336                           clp->cl_rpcclient->cl_nodename, buf,
6337                           rpc_peeraddr2str(clp->cl_rpcclient,
6338                                            RPC_DISPLAY_ADDR));
6339         else
6340                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6341                           clp->cl_rpcclient->cl_nodename,
6342                           rpc_peeraddr2str(clp->cl_rpcclient,
6343                                            RPC_DISPLAY_ADDR));
6344         rcu_read_unlock();
6345
6346         clp->cl_owner_id = str;
6347         return 0;
6348 }
6349
6350 static int
6351 nfs4_init_uniform_client_string(struct nfs_client *clp)
6352 {
6353         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6354         size_t buflen;
6355         size_t len;
6356         char *str;
6357
6358         if (clp->cl_owner_id != NULL)
6359                 return 0;
6360
6361         len = 10 + 10 + 1 + 10 + 1 +
6362                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6363
6364         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6365         if (buflen)
6366                 len += buflen + 1;
6367
6368         if (len > NFS4_OPAQUE_LIMIT + 1)
6369                 return -EINVAL;
6370
6371         /*
6372          * Since this string is allocated at mount time, and held until the
6373          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6374          * about a memory-reclaim deadlock.
6375          */
6376         str = kmalloc(len, GFP_KERNEL);
6377         if (!str)
6378                 return -ENOMEM;
6379
6380         if (buflen)
6381                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6382                           clp->rpc_ops->version, clp->cl_minorversion,
6383                           buf, clp->cl_rpcclient->cl_nodename);
6384         else
6385                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6386                           clp->rpc_ops->version, clp->cl_minorversion,
6387                           clp->cl_rpcclient->cl_nodename);
6388         clp->cl_owner_id = str;
6389         return 0;
6390 }
6391
6392 /*
6393  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6394  * services.  Advertise one based on the address family of the
6395  * clientaddr.
6396  */
6397 static unsigned int
6398 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6399 {
6400         if (strchr(clp->cl_ipaddr, ':') != NULL)
6401                 return scnprintf(buf, len, "tcp6");
6402         else
6403                 return scnprintf(buf, len, "tcp");
6404 }
6405
6406 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6407 {
6408         struct nfs4_setclientid *sc = calldata;
6409
6410         if (task->tk_status == 0)
6411                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6412 }
6413
6414 static const struct rpc_call_ops nfs4_setclientid_ops = {
6415         .rpc_call_done = nfs4_setclientid_done,
6416 };
6417
6418 /**
6419  * nfs4_proc_setclientid - Negotiate client ID
6420  * @clp: state data structure
6421  * @program: RPC program for NFSv4 callback service
6422  * @port: IP port number for NFS4 callback service
6423  * @cred: credential to use for this call
6424  * @res: where to place the result
6425  *
6426  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6427  */
6428 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6429                 unsigned short port, const struct cred *cred,
6430                 struct nfs4_setclientid_res *res)
6431 {
6432         nfs4_verifier sc_verifier;
6433         struct nfs4_setclientid setclientid = {
6434                 .sc_verifier = &sc_verifier,
6435                 .sc_prog = program,
6436                 .sc_clnt = clp,
6437         };
6438         struct rpc_message msg = {
6439                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6440                 .rpc_argp = &setclientid,
6441                 .rpc_resp = res,
6442                 .rpc_cred = cred,
6443         };
6444         struct rpc_task_setup task_setup_data = {
6445                 .rpc_client = clp->cl_rpcclient,
6446                 .rpc_message = &msg,
6447                 .callback_ops = &nfs4_setclientid_ops,
6448                 .callback_data = &setclientid,
6449                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6450         };
6451         unsigned long now = jiffies;
6452         int status;
6453
6454         /* nfs_client_id4 */
6455         nfs4_init_boot_verifier(clp, &sc_verifier);
6456
6457         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6458                 status = nfs4_init_uniform_client_string(clp);
6459         else
6460                 status = nfs4_init_nonuniform_client_string(clp);
6461
6462         if (status)
6463                 goto out;
6464
6465         /* cb_client4 */
6466         setclientid.sc_netid_len =
6467                                 nfs4_init_callback_netid(clp,
6468                                                 setclientid.sc_netid,
6469                                                 sizeof(setclientid.sc_netid));
6470         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6471                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6472                                 clp->cl_ipaddr, port >> 8, port & 255);
6473
6474         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6475                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6476                 clp->cl_owner_id);
6477
6478         status = nfs4_call_sync_custom(&task_setup_data);
6479         if (setclientid.sc_cred) {
6480                 kfree(clp->cl_acceptor);
6481                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6482                 put_rpccred(setclientid.sc_cred);
6483         }
6484
6485         if (status == 0)
6486                 do_renew_lease(clp, now);
6487 out:
6488         trace_nfs4_setclientid(clp, status);
6489         dprintk("NFS reply setclientid: %d\n", status);
6490         return status;
6491 }
6492
6493 /**
6494  * nfs4_proc_setclientid_confirm - Confirm client ID
6495  * @clp: state data structure
6496  * @arg: result of a previous SETCLIENTID
6497  * @cred: credential to use for this call
6498  *
6499  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6500  */
6501 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6502                 struct nfs4_setclientid_res *arg,
6503                 const struct cred *cred)
6504 {
6505         struct rpc_message msg = {
6506                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6507                 .rpc_argp = arg,
6508                 .rpc_cred = cred,
6509         };
6510         int status;
6511
6512         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6513                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6514                 clp->cl_clientid);
6515         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6516                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6517         trace_nfs4_setclientid_confirm(clp, status);
6518         dprintk("NFS reply setclientid_confirm: %d\n", status);
6519         return status;
6520 }
6521
6522 struct nfs4_delegreturndata {
6523         struct nfs4_delegreturnargs args;
6524         struct nfs4_delegreturnres res;
6525         struct nfs_fh fh;
6526         nfs4_stateid stateid;
6527         unsigned long timestamp;
6528         struct {
6529                 struct nfs4_layoutreturn_args arg;
6530                 struct nfs4_layoutreturn_res res;
6531                 struct nfs4_xdr_opaque_data ld_private;
6532                 u32 roc_barrier;
6533                 bool roc;
6534         } lr;
6535         struct nfs_fattr fattr;
6536         int rpc_status;
6537         struct inode *inode;
6538 };
6539
6540 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6541 {
6542         struct nfs4_delegreturndata *data = calldata;
6543         struct nfs4_exception exception = {
6544                 .inode = data->inode,
6545                 .stateid = &data->stateid,
6546                 .task_is_privileged = data->args.seq_args.sa_privileged,
6547         };
6548
6549         if (!nfs4_sequence_done(task, &data->res.seq_res))
6550                 return;
6551
6552         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6553
6554         /* Handle Layoutreturn errors */
6555         if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6556                           &data->res.lr_ret) == -EAGAIN)
6557                 goto out_restart;
6558
6559         switch (task->tk_status) {
6560         case 0:
6561                 renew_lease(data->res.server, data->timestamp);
6562                 break;
6563         case -NFS4ERR_ADMIN_REVOKED:
6564         case -NFS4ERR_DELEG_REVOKED:
6565         case -NFS4ERR_EXPIRED:
6566                 nfs4_free_revoked_stateid(data->res.server,
6567                                 data->args.stateid,
6568                                 task->tk_msg.rpc_cred);
6569                 fallthrough;
6570         case -NFS4ERR_BAD_STATEID:
6571         case -NFS4ERR_STALE_STATEID:
6572         case -ETIMEDOUT:
6573                 task->tk_status = 0;
6574                 break;
6575         case -NFS4ERR_OLD_STATEID:
6576                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6577                         nfs4_stateid_seqid_inc(&data->stateid);
6578                 if (data->args.bitmask) {
6579                         data->args.bitmask = NULL;
6580                         data->res.fattr = NULL;
6581                 }
6582                 goto out_restart;
6583         case -NFS4ERR_ACCESS:
6584                 if (data->args.bitmask) {
6585                         data->args.bitmask = NULL;
6586                         data->res.fattr = NULL;
6587                         goto out_restart;
6588                 }
6589                 fallthrough;
6590         default:
6591                 task->tk_status = nfs4_async_handle_exception(task,
6592                                 data->res.server, task->tk_status,
6593                                 &exception);
6594                 if (exception.retry)
6595                         goto out_restart;
6596         }
6597         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6598         data->rpc_status = task->tk_status;
6599         return;
6600 out_restart:
6601         task->tk_status = 0;
6602         rpc_restart_call_prepare(task);
6603 }
6604
6605 static void nfs4_delegreturn_release(void *calldata)
6606 {
6607         struct nfs4_delegreturndata *data = calldata;
6608         struct inode *inode = data->inode;
6609
6610         if (data->lr.roc)
6611                 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6612                                  data->res.lr_ret);
6613         if (inode) {
6614                 nfs4_fattr_set_prechange(&data->fattr,
6615                                          inode_peek_iversion_raw(inode));
6616                 nfs_refresh_inode(inode, &data->fattr);
6617                 nfs_iput_and_deactive(inode);
6618         }
6619         kfree(calldata);
6620 }
6621
6622 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6623 {
6624         struct nfs4_delegreturndata *d_data;
6625         struct pnfs_layout_hdr *lo;
6626
6627         d_data = data;
6628
6629         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6630                 nfs4_sequence_done(task, &d_data->res.seq_res);
6631                 return;
6632         }
6633
6634         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6635         if (lo && !pnfs_layout_is_valid(lo)) {
6636                 d_data->args.lr_args = NULL;
6637                 d_data->res.lr_res = NULL;
6638         }
6639
6640         nfs4_setup_sequence(d_data->res.server->nfs_client,
6641                         &d_data->args.seq_args,
6642                         &d_data->res.seq_res,
6643                         task);
6644 }
6645
6646 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6647         .rpc_call_prepare = nfs4_delegreturn_prepare,
6648         .rpc_call_done = nfs4_delegreturn_done,
6649         .rpc_release = nfs4_delegreturn_release,
6650 };
6651
6652 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6653 {
6654         struct nfs4_delegreturndata *data;
6655         struct nfs_server *server = NFS_SERVER(inode);
6656         struct rpc_task *task;
6657         struct rpc_message msg = {
6658                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6659                 .rpc_cred = cred,
6660         };
6661         struct rpc_task_setup task_setup_data = {
6662                 .rpc_client = server->client,
6663                 .rpc_message = &msg,
6664                 .callback_ops = &nfs4_delegreturn_ops,
6665                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6666         };
6667         int status = 0;
6668
6669         if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6670                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6671
6672         data = kzalloc(sizeof(*data), GFP_KERNEL);
6673         if (data == NULL)
6674                 return -ENOMEM;
6675
6676         nfs4_state_protect(server->nfs_client,
6677                         NFS_SP4_MACH_CRED_CLEANUP,
6678                         &task_setup_data.rpc_client, &msg);
6679
6680         data->args.fhandle = &data->fh;
6681         data->args.stateid = &data->stateid;
6682         nfs4_bitmask_set(data->args.bitmask_store,
6683                          server->cache_consistency_bitmask, inode, 0);
6684         data->args.bitmask = data->args.bitmask_store;
6685         nfs_copy_fh(&data->fh, NFS_FH(inode));
6686         nfs4_stateid_copy(&data->stateid, stateid);
6687         data->res.fattr = &data->fattr;
6688         data->res.server = server;
6689         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6690         data->lr.arg.ld_private = &data->lr.ld_private;
6691         nfs_fattr_init(data->res.fattr);
6692         data->timestamp = jiffies;
6693         data->rpc_status = 0;
6694         data->inode = nfs_igrab_and_active(inode);
6695         if (data->inode || issync) {
6696                 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6697                                         cred);
6698                 if (data->lr.roc) {
6699                         data->args.lr_args = &data->lr.arg;
6700                         data->res.lr_res = &data->lr.res;
6701                 }
6702         }
6703
6704         if (!data->inode)
6705                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6706                                    1);
6707         else
6708                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6709                                    0);
6710         task_setup_data.callback_data = data;
6711         msg.rpc_argp = &data->args;
6712         msg.rpc_resp = &data->res;
6713         task = rpc_run_task(&task_setup_data);
6714         if (IS_ERR(task))
6715                 return PTR_ERR(task);
6716         if (!issync)
6717                 goto out;
6718         status = rpc_wait_for_completion_task(task);
6719         if (status != 0)
6720                 goto out;
6721         status = data->rpc_status;
6722 out:
6723         rpc_put_task(task);
6724         return status;
6725 }
6726
6727 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6728 {
6729         struct nfs_server *server = NFS_SERVER(inode);
6730         struct nfs4_exception exception = { };
6731         int err;
6732         do {
6733                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6734                 trace_nfs4_delegreturn(inode, stateid, err);
6735                 switch (err) {
6736                         case -NFS4ERR_STALE_STATEID:
6737                         case -NFS4ERR_EXPIRED:
6738                         case 0:
6739                                 return 0;
6740                 }
6741                 err = nfs4_handle_exception(server, err, &exception);
6742         } while (exception.retry);
6743         return err;
6744 }
6745
6746 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6747 {
6748         struct inode *inode = state->inode;
6749         struct nfs_server *server = NFS_SERVER(inode);
6750         struct nfs_client *clp = server->nfs_client;
6751         struct nfs_lockt_args arg = {
6752                 .fh = NFS_FH(inode),
6753                 .fl = request,
6754         };
6755         struct nfs_lockt_res res = {
6756                 .denied = request,
6757         };
6758         struct rpc_message msg = {
6759                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6760                 .rpc_argp       = &arg,
6761                 .rpc_resp       = &res,
6762                 .rpc_cred       = state->owner->so_cred,
6763         };
6764         struct nfs4_lock_state *lsp;
6765         int status;
6766
6767         arg.lock_owner.clientid = clp->cl_clientid;
6768         status = nfs4_set_lock_state(state, request);
6769         if (status != 0)
6770                 goto out;
6771         lsp = request->fl_u.nfs4_fl.owner;
6772         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6773         arg.lock_owner.s_dev = server->s_dev;
6774         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6775         switch (status) {
6776                 case 0:
6777                         request->fl_type = F_UNLCK;
6778                         break;
6779                 case -NFS4ERR_DENIED:
6780                         status = 0;
6781         }
6782         request->fl_ops->fl_release_private(request);
6783         request->fl_ops = NULL;
6784 out:
6785         return status;
6786 }
6787
6788 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6789 {
6790         struct nfs4_exception exception = {
6791                 .interruptible = true,
6792         };
6793         int err;
6794
6795         do {
6796                 err = _nfs4_proc_getlk(state, cmd, request);
6797                 trace_nfs4_get_lock(request, state, cmd, err);
6798                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6799                                 &exception);
6800         } while (exception.retry);
6801         return err;
6802 }
6803
6804 /*
6805  * Update the seqid of a lock stateid after receiving
6806  * NFS4ERR_OLD_STATEID
6807  */
6808 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6809                 struct nfs4_lock_state *lsp)
6810 {
6811         struct nfs4_state *state = lsp->ls_state;
6812         bool ret = false;
6813
6814         spin_lock(&state->state_lock);
6815         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6816                 goto out;
6817         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6818                 nfs4_stateid_seqid_inc(dst);
6819         else
6820                 dst->seqid = lsp->ls_stateid.seqid;
6821         ret = true;
6822 out:
6823         spin_unlock(&state->state_lock);
6824         return ret;
6825 }
6826
6827 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6828                 struct nfs4_lock_state *lsp)
6829 {
6830         struct nfs4_state *state = lsp->ls_state;
6831         bool ret;
6832
6833         spin_lock(&state->state_lock);
6834         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6835         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6836         spin_unlock(&state->state_lock);
6837         return ret;
6838 }
6839
6840 struct nfs4_unlockdata {
6841         struct nfs_locku_args arg;
6842         struct nfs_locku_res res;
6843         struct nfs4_lock_state *lsp;
6844         struct nfs_open_context *ctx;
6845         struct nfs_lock_context *l_ctx;
6846         struct file_lock fl;
6847         struct nfs_server *server;
6848         unsigned long timestamp;
6849 };
6850
6851 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6852                 struct nfs_open_context *ctx,
6853                 struct nfs4_lock_state *lsp,
6854                 struct nfs_seqid *seqid)
6855 {
6856         struct nfs4_unlockdata *p;
6857         struct nfs4_state *state = lsp->ls_state;
6858         struct inode *inode = state->inode;
6859
6860         p = kzalloc(sizeof(*p), GFP_KERNEL);
6861         if (p == NULL)
6862                 return NULL;
6863         p->arg.fh = NFS_FH(inode);
6864         p->arg.fl = &p->fl;
6865         p->arg.seqid = seqid;
6866         p->res.seqid = seqid;
6867         p->lsp = lsp;
6868         /* Ensure we don't close file until we're done freeing locks! */
6869         p->ctx = get_nfs_open_context(ctx);
6870         p->l_ctx = nfs_get_lock_context(ctx);
6871         locks_init_lock(&p->fl);
6872         locks_copy_lock(&p->fl, fl);
6873         p->server = NFS_SERVER(inode);
6874         spin_lock(&state->state_lock);
6875         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6876         spin_unlock(&state->state_lock);
6877         return p;
6878 }
6879
6880 static void nfs4_locku_release_calldata(void *data)
6881 {
6882         struct nfs4_unlockdata *calldata = data;
6883         nfs_free_seqid(calldata->arg.seqid);
6884         nfs4_put_lock_state(calldata->lsp);
6885         nfs_put_lock_context(calldata->l_ctx);
6886         put_nfs_open_context(calldata->ctx);
6887         kfree(calldata);
6888 }
6889
6890 static void nfs4_locku_done(struct rpc_task *task, void *data)
6891 {
6892         struct nfs4_unlockdata *calldata = data;
6893         struct nfs4_exception exception = {
6894                 .inode = calldata->lsp->ls_state->inode,
6895                 .stateid = &calldata->arg.stateid,
6896         };
6897
6898         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6899                 return;
6900         switch (task->tk_status) {
6901                 case 0:
6902                         renew_lease(calldata->server, calldata->timestamp);
6903                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6904                         if (nfs4_update_lock_stateid(calldata->lsp,
6905                                         &calldata->res.stateid))
6906                                 break;
6907                         fallthrough;
6908                 case -NFS4ERR_ADMIN_REVOKED:
6909                 case -NFS4ERR_EXPIRED:
6910                         nfs4_free_revoked_stateid(calldata->server,
6911                                         &calldata->arg.stateid,
6912                                         task->tk_msg.rpc_cred);
6913                         fallthrough;
6914                 case -NFS4ERR_BAD_STATEID:
6915                 case -NFS4ERR_STALE_STATEID:
6916                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6917                                                 calldata->lsp))
6918                                 rpc_restart_call_prepare(task);
6919                         break;
6920                 case -NFS4ERR_OLD_STATEID:
6921                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6922                                                 calldata->lsp))
6923                                 rpc_restart_call_prepare(task);
6924                         break;
6925                 default:
6926                         task->tk_status = nfs4_async_handle_exception(task,
6927                                         calldata->server, task->tk_status,
6928                                         &exception);
6929                         if (exception.retry)
6930                                 rpc_restart_call_prepare(task);
6931         }
6932         nfs_release_seqid(calldata->arg.seqid);
6933 }
6934
6935 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6936 {
6937         struct nfs4_unlockdata *calldata = data;
6938
6939         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6940                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6941                 return;
6942
6943         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6944                 goto out_wait;
6945         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6946                 /* Note: exit _without_ running nfs4_locku_done */
6947                 goto out_no_action;
6948         }
6949         calldata->timestamp = jiffies;
6950         if (nfs4_setup_sequence(calldata->server->nfs_client,
6951                                 &calldata->arg.seq_args,
6952                                 &calldata->res.seq_res,
6953                                 task) != 0)
6954                 nfs_release_seqid(calldata->arg.seqid);
6955         return;
6956 out_no_action:
6957         task->tk_action = NULL;
6958 out_wait:
6959         nfs4_sequence_done(task, &calldata->res.seq_res);
6960 }
6961
6962 static const struct rpc_call_ops nfs4_locku_ops = {
6963         .rpc_call_prepare = nfs4_locku_prepare,
6964         .rpc_call_done = nfs4_locku_done,
6965         .rpc_release = nfs4_locku_release_calldata,
6966 };
6967
6968 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6969                 struct nfs_open_context *ctx,
6970                 struct nfs4_lock_state *lsp,
6971                 struct nfs_seqid *seqid)
6972 {
6973         struct nfs4_unlockdata *data;
6974         struct rpc_message msg = {
6975                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6976                 .rpc_cred = ctx->cred,
6977         };
6978         struct rpc_task_setup task_setup_data = {
6979                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6980                 .rpc_message = &msg,
6981                 .callback_ops = &nfs4_locku_ops,
6982                 .workqueue = nfsiod_workqueue,
6983                 .flags = RPC_TASK_ASYNC,
6984         };
6985
6986         if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
6987                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6988
6989         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6990                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6991
6992         /* Ensure this is an unlock - when canceling a lock, the
6993          * canceled lock is passed in, and it won't be an unlock.
6994          */
6995         fl->fl_type = F_UNLCK;
6996         if (fl->fl_flags & FL_CLOSE)
6997                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6998
6999         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7000         if (data == NULL) {
7001                 nfs_free_seqid(seqid);
7002                 return ERR_PTR(-ENOMEM);
7003         }
7004
7005         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7006         msg.rpc_argp = &data->arg;
7007         msg.rpc_resp = &data->res;
7008         task_setup_data.callback_data = data;
7009         return rpc_run_task(&task_setup_data);
7010 }
7011
7012 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7013 {
7014         struct inode *inode = state->inode;
7015         struct nfs4_state_owner *sp = state->owner;
7016         struct nfs_inode *nfsi = NFS_I(inode);
7017         struct nfs_seqid *seqid;
7018         struct nfs4_lock_state *lsp;
7019         struct rpc_task *task;
7020         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7021         int status = 0;
7022         unsigned char fl_flags = request->fl_flags;
7023
7024         status = nfs4_set_lock_state(state, request);
7025         /* Unlock _before_ we do the RPC call */
7026         request->fl_flags |= FL_EXISTS;
7027         /* Exclude nfs_delegation_claim_locks() */
7028         mutex_lock(&sp->so_delegreturn_mutex);
7029         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7030         down_read(&nfsi->rwsem);
7031         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7032                 up_read(&nfsi->rwsem);
7033                 mutex_unlock(&sp->so_delegreturn_mutex);
7034                 goto out;
7035         }
7036         lsp = request->fl_u.nfs4_fl.owner;
7037         set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7038         up_read(&nfsi->rwsem);
7039         mutex_unlock(&sp->so_delegreturn_mutex);
7040         if (status != 0)
7041                 goto out;
7042         /* Is this a delegated lock? */
7043         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7044                 goto out;
7045         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7046         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7047         status = -ENOMEM;
7048         if (IS_ERR(seqid))
7049                 goto out;
7050         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
7051         status = PTR_ERR(task);
7052         if (IS_ERR(task))
7053                 goto out;
7054         status = rpc_wait_for_completion_task(task);
7055         rpc_put_task(task);
7056 out:
7057         request->fl_flags = fl_flags;
7058         trace_nfs4_unlock(request, state, F_SETLK, status);
7059         return status;
7060 }
7061
7062 struct nfs4_lockdata {
7063         struct nfs_lock_args arg;
7064         struct nfs_lock_res res;
7065         struct nfs4_lock_state *lsp;
7066         struct nfs_open_context *ctx;
7067         struct file_lock fl;
7068         unsigned long timestamp;
7069         int rpc_status;
7070         int cancelled;
7071         struct nfs_server *server;
7072 };
7073
7074 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7075                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7076                 gfp_t gfp_mask)
7077 {
7078         struct nfs4_lockdata *p;
7079         struct inode *inode = lsp->ls_state->inode;
7080         struct nfs_server *server = NFS_SERVER(inode);
7081         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7082
7083         p = kzalloc(sizeof(*p), gfp_mask);
7084         if (p == NULL)
7085                 return NULL;
7086
7087         p->arg.fh = NFS_FH(inode);
7088         p->arg.fl = &p->fl;
7089         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7090         if (IS_ERR(p->arg.open_seqid))
7091                 goto out_free;
7092         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7093         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7094         if (IS_ERR(p->arg.lock_seqid))
7095                 goto out_free_seqid;
7096         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7097         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7098         p->arg.lock_owner.s_dev = server->s_dev;
7099         p->res.lock_seqid = p->arg.lock_seqid;
7100         p->lsp = lsp;
7101         p->server = server;
7102         p->ctx = get_nfs_open_context(ctx);
7103         locks_init_lock(&p->fl);
7104         locks_copy_lock(&p->fl, fl);
7105         return p;
7106 out_free_seqid:
7107         nfs_free_seqid(p->arg.open_seqid);
7108 out_free:
7109         kfree(p);
7110         return NULL;
7111 }
7112
7113 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7114 {
7115         struct nfs4_lockdata *data = calldata;
7116         struct nfs4_state *state = data->lsp->ls_state;
7117
7118         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7119                 goto out_wait;
7120         /* Do we need to do an open_to_lock_owner? */
7121         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7122                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7123                         goto out_release_lock_seqid;
7124                 }
7125                 nfs4_stateid_copy(&data->arg.open_stateid,
7126                                 &state->open_stateid);
7127                 data->arg.new_lock_owner = 1;
7128                 data->res.open_seqid = data->arg.open_seqid;
7129         } else {
7130                 data->arg.new_lock_owner = 0;
7131                 nfs4_stateid_copy(&data->arg.lock_stateid,
7132                                 &data->lsp->ls_stateid);
7133         }
7134         if (!nfs4_valid_open_stateid(state)) {
7135                 data->rpc_status = -EBADF;
7136                 task->tk_action = NULL;
7137                 goto out_release_open_seqid;
7138         }
7139         data->timestamp = jiffies;
7140         if (nfs4_setup_sequence(data->server->nfs_client,
7141                                 &data->arg.seq_args,
7142                                 &data->res.seq_res,
7143                                 task) == 0)
7144                 return;
7145 out_release_open_seqid:
7146         nfs_release_seqid(data->arg.open_seqid);
7147 out_release_lock_seqid:
7148         nfs_release_seqid(data->arg.lock_seqid);
7149 out_wait:
7150         nfs4_sequence_done(task, &data->res.seq_res);
7151         dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7152 }
7153
7154 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7155 {
7156         struct nfs4_lockdata *data = calldata;
7157         struct nfs4_lock_state *lsp = data->lsp;
7158
7159         if (!nfs4_sequence_done(task, &data->res.seq_res))
7160                 return;
7161
7162         data->rpc_status = task->tk_status;
7163         switch (task->tk_status) {
7164         case 0:
7165                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7166                                 data->timestamp);
7167                 if (data->arg.new_lock && !data->cancelled) {
7168                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7169                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7170                                 goto out_restart;
7171                 }
7172                 if (data->arg.new_lock_owner != 0) {
7173                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
7174                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7175                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7176                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7177                         goto out_restart;
7178                 break;
7179         case -NFS4ERR_OLD_STATEID:
7180                 if (data->arg.new_lock_owner != 0 &&
7181                         nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7182                                         lsp->ls_state))
7183                         goto out_restart;
7184                 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7185                         goto out_restart;
7186                 fallthrough;
7187         case -NFS4ERR_BAD_STATEID:
7188         case -NFS4ERR_STALE_STATEID:
7189         case -NFS4ERR_EXPIRED:
7190                 if (data->arg.new_lock_owner != 0) {
7191                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7192                                                 &lsp->ls_state->open_stateid))
7193                                 goto out_restart;
7194                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7195                                                 &lsp->ls_stateid))
7196                                 goto out_restart;
7197         }
7198 out_done:
7199         dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7200         return;
7201 out_restart:
7202         if (!data->cancelled)
7203                 rpc_restart_call_prepare(task);
7204         goto out_done;
7205 }
7206
7207 static void nfs4_lock_release(void *calldata)
7208 {
7209         struct nfs4_lockdata *data = calldata;
7210
7211         nfs_free_seqid(data->arg.open_seqid);
7212         if (data->cancelled && data->rpc_status == 0) {
7213                 struct rpc_task *task;
7214                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7215                                 data->arg.lock_seqid);
7216                 if (!IS_ERR(task))
7217                         rpc_put_task_async(task);
7218                 dprintk("%s: cancelling lock!\n", __func__);
7219         } else
7220                 nfs_free_seqid(data->arg.lock_seqid);
7221         nfs4_put_lock_state(data->lsp);
7222         put_nfs_open_context(data->ctx);
7223         kfree(data);
7224 }
7225
7226 static const struct rpc_call_ops nfs4_lock_ops = {
7227         .rpc_call_prepare = nfs4_lock_prepare,
7228         .rpc_call_done = nfs4_lock_done,
7229         .rpc_release = nfs4_lock_release,
7230 };
7231
7232 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7233 {
7234         switch (error) {
7235         case -NFS4ERR_ADMIN_REVOKED:
7236         case -NFS4ERR_EXPIRED:
7237         case -NFS4ERR_BAD_STATEID:
7238                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7239                 if (new_lock_owner != 0 ||
7240                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7241                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7242                 break;
7243         case -NFS4ERR_STALE_STATEID:
7244                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7245                 nfs4_schedule_lease_recovery(server->nfs_client);
7246         }
7247 }
7248
7249 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7250 {
7251         struct nfs4_lockdata *data;
7252         struct rpc_task *task;
7253         struct rpc_message msg = {
7254                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7255                 .rpc_cred = state->owner->so_cred,
7256         };
7257         struct rpc_task_setup task_setup_data = {
7258                 .rpc_client = NFS_CLIENT(state->inode),
7259                 .rpc_message = &msg,
7260                 .callback_ops = &nfs4_lock_ops,
7261                 .workqueue = nfsiod_workqueue,
7262                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7263         };
7264         int ret;
7265
7266         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7267                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7268
7269         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7270                                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7271         if (data == NULL)
7272                 return -ENOMEM;
7273         if (IS_SETLKW(cmd))
7274                 data->arg.block = 1;
7275         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7276                                 recovery_type > NFS_LOCK_NEW);
7277         msg.rpc_argp = &data->arg;
7278         msg.rpc_resp = &data->res;
7279         task_setup_data.callback_data = data;
7280         if (recovery_type > NFS_LOCK_NEW) {
7281                 if (recovery_type == NFS_LOCK_RECLAIM)
7282                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7283         } else
7284                 data->arg.new_lock = 1;
7285         task = rpc_run_task(&task_setup_data);
7286         if (IS_ERR(task))
7287                 return PTR_ERR(task);
7288         ret = rpc_wait_for_completion_task(task);
7289         if (ret == 0) {
7290                 ret = data->rpc_status;
7291                 if (ret)
7292                         nfs4_handle_setlk_error(data->server, data->lsp,
7293                                         data->arg.new_lock_owner, ret);
7294         } else
7295                 data->cancelled = true;
7296         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7297         rpc_put_task(task);
7298         dprintk("%s: ret = %d\n", __func__, ret);
7299         return ret;
7300 }
7301
7302 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7303 {
7304         struct nfs_server *server = NFS_SERVER(state->inode);
7305         struct nfs4_exception exception = {
7306                 .inode = state->inode,
7307         };
7308         int err;
7309
7310         do {
7311                 /* Cache the lock if possible... */
7312                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7313                         return 0;
7314                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7315                 if (err != -NFS4ERR_DELAY)
7316                         break;
7317                 nfs4_handle_exception(server, err, &exception);
7318         } while (exception.retry);
7319         return err;
7320 }
7321
7322 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7323 {
7324         struct nfs_server *server = NFS_SERVER(state->inode);
7325         struct nfs4_exception exception = {
7326                 .inode = state->inode,
7327         };
7328         int err;
7329
7330         err = nfs4_set_lock_state(state, request);
7331         if (err != 0)
7332                 return err;
7333         if (!recover_lost_locks) {
7334                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7335                 return 0;
7336         }
7337         do {
7338                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7339                         return 0;
7340                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7341                 switch (err) {
7342                 default:
7343                         goto out;
7344                 case -NFS4ERR_GRACE:
7345                 case -NFS4ERR_DELAY:
7346                         nfs4_handle_exception(server, err, &exception);
7347                         err = 0;
7348                 }
7349         } while (exception.retry);
7350 out:
7351         return err;
7352 }
7353
7354 #if defined(CONFIG_NFS_V4_1)
7355 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7356 {
7357         struct nfs4_lock_state *lsp;
7358         int status;
7359
7360         status = nfs4_set_lock_state(state, request);
7361         if (status != 0)
7362                 return status;
7363         lsp = request->fl_u.nfs4_fl.owner;
7364         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7365             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7366                 return 0;
7367         return nfs4_lock_expired(state, request);
7368 }
7369 #endif
7370
7371 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7372 {
7373         struct nfs_inode *nfsi = NFS_I(state->inode);
7374         struct nfs4_state_owner *sp = state->owner;
7375         unsigned char fl_flags = request->fl_flags;
7376         int status;
7377
7378         request->fl_flags |= FL_ACCESS;
7379         status = locks_lock_inode_wait(state->inode, request);
7380         if (status < 0)
7381                 goto out;
7382         mutex_lock(&sp->so_delegreturn_mutex);
7383         down_read(&nfsi->rwsem);
7384         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7385                 /* Yes: cache locks! */
7386                 /* ...but avoid races with delegation recall... */
7387                 request->fl_flags = fl_flags & ~FL_SLEEP;
7388                 status = locks_lock_inode_wait(state->inode, request);
7389                 up_read(&nfsi->rwsem);
7390                 mutex_unlock(&sp->so_delegreturn_mutex);
7391                 goto out;
7392         }
7393         up_read(&nfsi->rwsem);
7394         mutex_unlock(&sp->so_delegreturn_mutex);
7395         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7396 out:
7397         request->fl_flags = fl_flags;
7398         return status;
7399 }
7400
7401 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7402 {
7403         struct nfs4_exception exception = {
7404                 .state = state,
7405                 .inode = state->inode,
7406                 .interruptible = true,
7407         };
7408         int err;
7409
7410         do {
7411                 err = _nfs4_proc_setlk(state, cmd, request);
7412                 if (err == -NFS4ERR_DENIED)
7413                         err = -EAGAIN;
7414                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7415                                 err, &exception);
7416         } while (exception.retry);
7417         return err;
7418 }
7419
7420 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7421 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7422
7423 static int
7424 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7425                         struct file_lock *request)
7426 {
7427         int             status = -ERESTARTSYS;
7428         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7429
7430         while(!signalled()) {
7431                 status = nfs4_proc_setlk(state, cmd, request);
7432                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7433                         break;
7434                 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7435                 schedule_timeout(timeout);
7436                 timeout *= 2;
7437                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7438                 status = -ERESTARTSYS;
7439         }
7440         return status;
7441 }
7442
7443 #ifdef CONFIG_NFS_V4_1
7444 struct nfs4_lock_waiter {
7445         struct inode            *inode;
7446         struct nfs_lowner       owner;
7447         wait_queue_entry_t      wait;
7448 };
7449
7450 static int
7451 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7452 {
7453         struct nfs4_lock_waiter *waiter =
7454                 container_of(wait, struct nfs4_lock_waiter, wait);
7455
7456         /* NULL key means to wake up everyone */
7457         if (key) {
7458                 struct cb_notify_lock_args      *cbnl = key;
7459                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7460                                                 *wowner = &waiter->owner;
7461
7462                 /* Only wake if the callback was for the same owner. */
7463                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7464                         return 0;
7465
7466                 /* Make sure it's for the right inode */
7467                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7468                         return 0;
7469         }
7470
7471         return woken_wake_function(wait, mode, flags, key);
7472 }
7473
7474 static int
7475 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7476 {
7477         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7478         struct nfs_server *server = NFS_SERVER(state->inode);
7479         struct nfs_client *clp = server->nfs_client;
7480         wait_queue_head_t *q = &clp->cl_lock_waitq;
7481         struct nfs4_lock_waiter waiter = {
7482                 .inode = state->inode,
7483                 .owner = { .clientid = clp->cl_clientid,
7484                            .id = lsp->ls_seqid.owner_id,
7485                            .s_dev = server->s_dev },
7486         };
7487         int status;
7488
7489         /* Don't bother with waitqueue if we don't expect a callback */
7490         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7491                 return nfs4_retry_setlk_simple(state, cmd, request);
7492
7493         init_wait(&waiter.wait);
7494         waiter.wait.func = nfs4_wake_lock_waiter;
7495         add_wait_queue(q, &waiter.wait);
7496
7497         do {
7498                 status = nfs4_proc_setlk(state, cmd, request);
7499                 if (status != -EAGAIN || IS_SETLK(cmd))
7500                         break;
7501
7502                 status = -ERESTARTSYS;
7503                 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7504                            NFS4_LOCK_MAXTIMEOUT);
7505         } while (!signalled());
7506
7507         remove_wait_queue(q, &waiter.wait);
7508
7509         return status;
7510 }
7511 #else /* !CONFIG_NFS_V4_1 */
7512 static inline int
7513 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7514 {
7515         return nfs4_retry_setlk_simple(state, cmd, request);
7516 }
7517 #endif
7518
7519 static int
7520 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7521 {
7522         struct nfs_open_context *ctx;
7523         struct nfs4_state *state;
7524         int status;
7525
7526         /* verify open state */
7527         ctx = nfs_file_open_context(filp);
7528         state = ctx->state;
7529
7530         if (IS_GETLK(cmd)) {
7531                 if (state != NULL)
7532                         return nfs4_proc_getlk(state, F_GETLK, request);
7533                 return 0;
7534         }
7535
7536         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7537                 return -EINVAL;
7538
7539         if (request->fl_type == F_UNLCK) {
7540                 if (state != NULL)
7541                         return nfs4_proc_unlck(state, cmd, request);
7542                 return 0;
7543         }
7544
7545         if (state == NULL)
7546                 return -ENOLCK;
7547
7548         if ((request->fl_flags & FL_POSIX) &&
7549             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7550                 return -ENOLCK;
7551
7552         /*
7553          * Don't rely on the VFS having checked the file open mode,
7554          * since it won't do this for flock() locks.
7555          */
7556         switch (request->fl_type) {
7557         case F_RDLCK:
7558                 if (!(filp->f_mode & FMODE_READ))
7559                         return -EBADF;
7560                 break;
7561         case F_WRLCK:
7562                 if (!(filp->f_mode & FMODE_WRITE))
7563                         return -EBADF;
7564         }
7565
7566         status = nfs4_set_lock_state(state, request);
7567         if (status != 0)
7568                 return status;
7569
7570         return nfs4_retry_setlk(state, cmd, request);
7571 }
7572
7573 static int nfs4_delete_lease(struct file *file, void **priv)
7574 {
7575         return generic_setlease(file, F_UNLCK, NULL, priv);
7576 }
7577
7578 static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease,
7579                           void **priv)
7580 {
7581         struct inode *inode = file_inode(file);
7582         fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7583         int ret;
7584
7585         /* No delegation, no lease */
7586         if (!nfs4_have_delegation(inode, type))
7587                 return -EAGAIN;
7588         ret = generic_setlease(file, arg, lease, priv);
7589         if (ret || nfs4_have_delegation(inode, type))
7590                 return ret;
7591         /* We raced with a delegation return */
7592         nfs4_delete_lease(file, priv);
7593         return -EAGAIN;
7594 }
7595
7596 int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease,
7597                        void **priv)
7598 {
7599         switch (arg) {
7600         case F_RDLCK:
7601         case F_WRLCK:
7602                 return nfs4_add_lease(file, arg, lease, priv);
7603         case F_UNLCK:
7604                 return nfs4_delete_lease(file, priv);
7605         default:
7606                 return -EINVAL;
7607         }
7608 }
7609
7610 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7611 {
7612         struct nfs_server *server = NFS_SERVER(state->inode);
7613         int err;
7614
7615         err = nfs4_set_lock_state(state, fl);
7616         if (err != 0)
7617                 return err;
7618         do {
7619                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7620                 if (err != -NFS4ERR_DELAY)
7621                         break;
7622                 ssleep(1);
7623         } while (err == -NFS4ERR_DELAY);
7624         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7625 }
7626
7627 struct nfs_release_lockowner_data {
7628         struct nfs4_lock_state *lsp;
7629         struct nfs_server *server;
7630         struct nfs_release_lockowner_args args;
7631         struct nfs_release_lockowner_res res;
7632         unsigned long timestamp;
7633 };
7634
7635 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7636 {
7637         struct nfs_release_lockowner_data *data = calldata;
7638         struct nfs_server *server = data->server;
7639         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7640                            &data->res.seq_res, task);
7641         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7642         data->timestamp = jiffies;
7643 }
7644
7645 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7646 {
7647         struct nfs_release_lockowner_data *data = calldata;
7648         struct nfs_server *server = data->server;
7649
7650         nfs40_sequence_done(task, &data->res.seq_res);
7651
7652         switch (task->tk_status) {
7653         case 0:
7654                 renew_lease(server, data->timestamp);
7655                 break;
7656         case -NFS4ERR_STALE_CLIENTID:
7657         case -NFS4ERR_EXPIRED:
7658                 nfs4_schedule_lease_recovery(server->nfs_client);
7659                 break;
7660         case -NFS4ERR_LEASE_MOVED:
7661         case -NFS4ERR_DELAY:
7662                 if (nfs4_async_handle_error(task, server,
7663                                             NULL, NULL) == -EAGAIN)
7664                         rpc_restart_call_prepare(task);
7665         }
7666 }
7667
7668 static void nfs4_release_lockowner_release(void *calldata)
7669 {
7670         struct nfs_release_lockowner_data *data = calldata;
7671         nfs4_free_lock_state(data->server, data->lsp);
7672         kfree(calldata);
7673 }
7674
7675 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7676         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7677         .rpc_call_done = nfs4_release_lockowner_done,
7678         .rpc_release = nfs4_release_lockowner_release,
7679 };
7680
7681 static void
7682 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7683 {
7684         struct nfs_release_lockowner_data *data;
7685         struct rpc_message msg = {
7686                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7687         };
7688
7689         if (server->nfs_client->cl_mvops->minor_version != 0)
7690                 return;
7691
7692         data = kmalloc(sizeof(*data), GFP_KERNEL);
7693         if (!data)
7694                 return;
7695         data->lsp = lsp;
7696         data->server = server;
7697         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7698         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7699         data->args.lock_owner.s_dev = server->s_dev;
7700
7701         msg.rpc_argp = &data->args;
7702         msg.rpc_resp = &data->res;
7703         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7704         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7705 }
7706
7707 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7708
7709 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7710                                    struct mnt_idmap *idmap,
7711                                    struct dentry *unused, struct inode *inode,
7712                                    const char *key, const void *buf,
7713                                    size_t buflen, int flags)
7714 {
7715         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7716 }
7717
7718 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7719                                    struct dentry *unused, struct inode *inode,
7720                                    const char *key, void *buf, size_t buflen)
7721 {
7722         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7723 }
7724
7725 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7726 {
7727         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7728 }
7729
7730 #if defined(CONFIG_NFS_V4_1)
7731 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7732
7733 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7734                                     struct mnt_idmap *idmap,
7735                                     struct dentry *unused, struct inode *inode,
7736                                     const char *key, const void *buf,
7737                                     size_t buflen, int flags)
7738 {
7739         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7740 }
7741
7742 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7743                                     struct dentry *unused, struct inode *inode,
7744                                     const char *key, void *buf, size_t buflen)
7745 {
7746         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7747 }
7748
7749 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7750 {
7751         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7752 }
7753
7754 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7755
7756 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7757                                     struct mnt_idmap *idmap,
7758                                     struct dentry *unused, struct inode *inode,
7759                                     const char *key, const void *buf,
7760                                     size_t buflen, int flags)
7761 {
7762         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7763 }
7764
7765 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7766                                     struct dentry *unused, struct inode *inode,
7767                                     const char *key, void *buf, size_t buflen)
7768 {
7769         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7770 }
7771
7772 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7773 {
7774         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7775 }
7776
7777 #endif
7778
7779 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7780
7781 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7782                                      struct mnt_idmap *idmap,
7783                                      struct dentry *unused, struct inode *inode,
7784                                      const char *key, const void *buf,
7785                                      size_t buflen, int flags)
7786 {
7787         if (security_ismaclabel(key))
7788                 return nfs4_set_security_label(inode, buf, buflen);
7789
7790         return -EOPNOTSUPP;
7791 }
7792
7793 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7794                                      struct dentry *unused, struct inode *inode,
7795                                      const char *key, void *buf, size_t buflen)
7796 {
7797         if (security_ismaclabel(key))
7798                 return nfs4_get_security_label(inode, buf, buflen);
7799         return -EOPNOTSUPP;
7800 }
7801
7802 static ssize_t
7803 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7804 {
7805         int len = 0;
7806
7807         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7808                 len = security_inode_listsecurity(inode, list, list_len);
7809                 if (len >= 0 && list_len && len > list_len)
7810                         return -ERANGE;
7811         }
7812         return len;
7813 }
7814
7815 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7816         .prefix = XATTR_SECURITY_PREFIX,
7817         .get    = nfs4_xattr_get_nfs4_label,
7818         .set    = nfs4_xattr_set_nfs4_label,
7819 };
7820
7821 #else
7822
7823 static ssize_t
7824 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7825 {
7826         return 0;
7827 }
7828
7829 #endif
7830
7831 #ifdef CONFIG_NFS_V4_2
7832 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7833                                     struct mnt_idmap *idmap,
7834                                     struct dentry *unused, struct inode *inode,
7835                                     const char *key, const void *buf,
7836                                     size_t buflen, int flags)
7837 {
7838         u32 mask;
7839         int ret;
7840
7841         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7842                 return -EOPNOTSUPP;
7843
7844         /*
7845          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7846          * flags right now. Handling of xattr operations use the normal
7847          * file read/write permissions.
7848          *
7849          * Just in case the server has other ideas (which RFC 8276 allows),
7850          * do a cached access check for the XA* flags to possibly avoid
7851          * doing an RPC and getting EACCES back.
7852          */
7853         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7854                 if (!(mask & NFS_ACCESS_XAWRITE))
7855                         return -EACCES;
7856         }
7857
7858         if (buf == NULL) {
7859                 ret = nfs42_proc_removexattr(inode, key);
7860                 if (!ret)
7861                         nfs4_xattr_cache_remove(inode, key);
7862         } else {
7863                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7864                 if (!ret)
7865                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7866         }
7867
7868         return ret;
7869 }
7870
7871 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7872                                     struct dentry *unused, struct inode *inode,
7873                                     const char *key, void *buf, size_t buflen)
7874 {
7875         u32 mask;
7876         ssize_t ret;
7877
7878         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7879                 return -EOPNOTSUPP;
7880
7881         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7882                 if (!(mask & NFS_ACCESS_XAREAD))
7883                         return -EACCES;
7884         }
7885
7886         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7887         if (ret)
7888                 return ret;
7889
7890         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7891         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7892                 return ret;
7893
7894         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7895
7896         return ret;
7897 }
7898
7899 static ssize_t
7900 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7901 {
7902         u64 cookie;
7903         bool eof;
7904         ssize_t ret, size;
7905         char *buf;
7906         size_t buflen;
7907         u32 mask;
7908
7909         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7910                 return 0;
7911
7912         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7913                 if (!(mask & NFS_ACCESS_XALIST))
7914                         return 0;
7915         }
7916
7917         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7918         if (ret)
7919                 return ret;
7920
7921         ret = nfs4_xattr_cache_list(inode, list, list_len);
7922         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7923                 return ret;
7924
7925         cookie = 0;
7926         eof = false;
7927         buflen = list_len ? list_len : XATTR_LIST_MAX;
7928         buf = list_len ? list : NULL;
7929         size = 0;
7930
7931         while (!eof) {
7932                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7933                     &cookie, &eof);
7934                 if (ret < 0)
7935                         return ret;
7936
7937                 if (list_len) {
7938                         buf += ret;
7939                         buflen -= ret;
7940                 }
7941                 size += ret;
7942         }
7943
7944         if (list_len)
7945                 nfs4_xattr_cache_set_list(inode, list, size);
7946
7947         return size;
7948 }
7949
7950 #else
7951
7952 static ssize_t
7953 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7954 {
7955         return 0;
7956 }
7957 #endif /* CONFIG_NFS_V4_2 */
7958
7959 /*
7960  * nfs_fhget will use either the mounted_on_fileid or the fileid
7961  */
7962 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7963 {
7964         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7965                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7966               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7967               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7968                 return;
7969
7970         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7971                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7972         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7973         fattr->nlink = 2;
7974 }
7975
7976 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7977                                    const struct qstr *name,
7978                                    struct nfs4_fs_locations *fs_locations,
7979                                    struct page *page)
7980 {
7981         struct nfs_server *server = NFS_SERVER(dir);
7982         u32 bitmask[3];
7983         struct nfs4_fs_locations_arg args = {
7984                 .dir_fh = NFS_FH(dir),
7985                 .name = name,
7986                 .page = page,
7987                 .bitmask = bitmask,
7988         };
7989         struct nfs4_fs_locations_res res = {
7990                 .fs_locations = fs_locations,
7991         };
7992         struct rpc_message msg = {
7993                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7994                 .rpc_argp = &args,
7995                 .rpc_resp = &res,
7996         };
7997         int status;
7998
7999         dprintk("%s: start\n", __func__);
8000
8001         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8002         bitmask[1] = nfs4_fattr_bitmap[1];
8003
8004         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8005          * is not supported */
8006         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8007                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8008         else
8009                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8010
8011         nfs_fattr_init(fs_locations->fattr);
8012         fs_locations->server = server;
8013         fs_locations->nlocations = 0;
8014         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8015         dprintk("%s: returned status = %d\n", __func__, status);
8016         return status;
8017 }
8018
8019 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8020                            const struct qstr *name,
8021                            struct nfs4_fs_locations *fs_locations,
8022                            struct page *page)
8023 {
8024         struct nfs4_exception exception = {
8025                 .interruptible = true,
8026         };
8027         int err;
8028         do {
8029                 err = _nfs4_proc_fs_locations(client, dir, name,
8030                                 fs_locations, page);
8031                 trace_nfs4_get_fs_locations(dir, name, err);
8032                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8033                                 &exception);
8034         } while (exception.retry);
8035         return err;
8036 }
8037
8038 /*
8039  * This operation also signals the server that this client is
8040  * performing migration recovery.  The server can stop returning
8041  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8042  * appended to this compound to identify the client ID which is
8043  * performing recovery.
8044  */
8045 static int _nfs40_proc_get_locations(struct nfs_server *server,
8046                                      struct nfs_fh *fhandle,
8047                                      struct nfs4_fs_locations *locations,
8048                                      struct page *page, const struct cred *cred)
8049 {
8050         struct rpc_clnt *clnt = server->client;
8051         u32 bitmask[2] = {
8052                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8053         };
8054         struct nfs4_fs_locations_arg args = {
8055                 .clientid       = server->nfs_client->cl_clientid,
8056                 .fh             = fhandle,
8057                 .page           = page,
8058                 .bitmask        = bitmask,
8059                 .migration      = 1,            /* skip LOOKUP */
8060                 .renew          = 1,            /* append RENEW */
8061         };
8062         struct nfs4_fs_locations_res res = {
8063                 .fs_locations   = locations,
8064                 .migration      = 1,
8065                 .renew          = 1,
8066         };
8067         struct rpc_message msg = {
8068                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8069                 .rpc_argp       = &args,
8070                 .rpc_resp       = &res,
8071                 .rpc_cred       = cred,
8072         };
8073         unsigned long now = jiffies;
8074         int status;
8075
8076         nfs_fattr_init(locations->fattr);
8077         locations->server = server;
8078         locations->nlocations = 0;
8079
8080         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8081         status = nfs4_call_sync_sequence(clnt, server, &msg,
8082                                         &args.seq_args, &res.seq_res);
8083         if (status)
8084                 return status;
8085
8086         renew_lease(server, now);
8087         return 0;
8088 }
8089
8090 #ifdef CONFIG_NFS_V4_1
8091
8092 /*
8093  * This operation also signals the server that this client is
8094  * performing migration recovery.  The server can stop asserting
8095  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8096  * performing this operation is identified in the SEQUENCE
8097  * operation in this compound.
8098  *
8099  * When the client supports GETATTR(fs_locations_info), it can
8100  * be plumbed in here.
8101  */
8102 static int _nfs41_proc_get_locations(struct nfs_server *server,
8103                                      struct nfs_fh *fhandle,
8104                                      struct nfs4_fs_locations *locations,
8105                                      struct page *page, const struct cred *cred)
8106 {
8107         struct rpc_clnt *clnt = server->client;
8108         u32 bitmask[2] = {
8109                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8110         };
8111         struct nfs4_fs_locations_arg args = {
8112                 .fh             = fhandle,
8113                 .page           = page,
8114                 .bitmask        = bitmask,
8115                 .migration      = 1,            /* skip LOOKUP */
8116         };
8117         struct nfs4_fs_locations_res res = {
8118                 .fs_locations   = locations,
8119                 .migration      = 1,
8120         };
8121         struct rpc_message msg = {
8122                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8123                 .rpc_argp       = &args,
8124                 .rpc_resp       = &res,
8125                 .rpc_cred       = cred,
8126         };
8127         struct nfs4_call_sync_data data = {
8128                 .seq_server = server,
8129                 .seq_args = &args.seq_args,
8130                 .seq_res = &res.seq_res,
8131         };
8132         struct rpc_task_setup task_setup_data = {
8133                 .rpc_client = clnt,
8134                 .rpc_message = &msg,
8135                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8136                 .callback_data = &data,
8137                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8138         };
8139         int status;
8140
8141         nfs_fattr_init(locations->fattr);
8142         locations->server = server;
8143         locations->nlocations = 0;
8144
8145         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8146         status = nfs4_call_sync_custom(&task_setup_data);
8147         if (status == NFS4_OK &&
8148             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8149                 status = -NFS4ERR_LEASE_MOVED;
8150         return status;
8151 }
8152
8153 #endif  /* CONFIG_NFS_V4_1 */
8154
8155 /**
8156  * nfs4_proc_get_locations - discover locations for a migrated FSID
8157  * @server: pointer to nfs_server to process
8158  * @fhandle: pointer to the kernel NFS client file handle
8159  * @locations: result of query
8160  * @page: buffer
8161  * @cred: credential to use for this operation
8162  *
8163  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8164  * operation failed, or a negative errno if a local error occurred.
8165  *
8166  * On success, "locations" is filled in, but if the server has
8167  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8168  * asserted.
8169  *
8170  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8171  * from this client that require migration recovery.
8172  */
8173 int nfs4_proc_get_locations(struct nfs_server *server,
8174                             struct nfs_fh *fhandle,
8175                             struct nfs4_fs_locations *locations,
8176                             struct page *page, const struct cred *cred)
8177 {
8178         struct nfs_client *clp = server->nfs_client;
8179         const struct nfs4_mig_recovery_ops *ops =
8180                                         clp->cl_mvops->mig_recovery_ops;
8181         struct nfs4_exception exception = {
8182                 .interruptible = true,
8183         };
8184         int status;
8185
8186         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8187                 (unsigned long long)server->fsid.major,
8188                 (unsigned long long)server->fsid.minor,
8189                 clp->cl_hostname);
8190         nfs_display_fhandle(fhandle, __func__);
8191
8192         do {
8193                 status = ops->get_locations(server, fhandle, locations, page,
8194                                             cred);
8195                 if (status != -NFS4ERR_DELAY)
8196                         break;
8197                 nfs4_handle_exception(server, status, &exception);
8198         } while (exception.retry);
8199         return status;
8200 }
8201
8202 /*
8203  * This operation also signals the server that this client is
8204  * performing "lease moved" recovery.  The server can stop
8205  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8206  * is appended to this compound to identify the client ID which is
8207  * performing recovery.
8208  */
8209 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8210 {
8211         struct nfs_server *server = NFS_SERVER(inode);
8212         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8213         struct rpc_clnt *clnt = server->client;
8214         struct nfs4_fsid_present_arg args = {
8215                 .fh             = NFS_FH(inode),
8216                 .clientid       = clp->cl_clientid,
8217                 .renew          = 1,            /* append RENEW */
8218         };
8219         struct nfs4_fsid_present_res res = {
8220                 .renew          = 1,
8221         };
8222         struct rpc_message msg = {
8223                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8224                 .rpc_argp       = &args,
8225                 .rpc_resp       = &res,
8226                 .rpc_cred       = cred,
8227         };
8228         unsigned long now = jiffies;
8229         int status;
8230
8231         res.fh = nfs_alloc_fhandle();
8232         if (res.fh == NULL)
8233                 return -ENOMEM;
8234
8235         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8236         status = nfs4_call_sync_sequence(clnt, server, &msg,
8237                                                 &args.seq_args, &res.seq_res);
8238         nfs_free_fhandle(res.fh);
8239         if (status)
8240                 return status;
8241
8242         do_renew_lease(clp, now);
8243         return 0;
8244 }
8245
8246 #ifdef CONFIG_NFS_V4_1
8247
8248 /*
8249  * This operation also signals the server that this client is
8250  * performing "lease moved" recovery.  The server can stop asserting
8251  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8252  * this operation is identified in the SEQUENCE operation in this
8253  * compound.
8254  */
8255 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8256 {
8257         struct nfs_server *server = NFS_SERVER(inode);
8258         struct rpc_clnt *clnt = server->client;
8259         struct nfs4_fsid_present_arg args = {
8260                 .fh             = NFS_FH(inode),
8261         };
8262         struct nfs4_fsid_present_res res = {
8263         };
8264         struct rpc_message msg = {
8265                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8266                 .rpc_argp       = &args,
8267                 .rpc_resp       = &res,
8268                 .rpc_cred       = cred,
8269         };
8270         int status;
8271
8272         res.fh = nfs_alloc_fhandle();
8273         if (res.fh == NULL)
8274                 return -ENOMEM;
8275
8276         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8277         status = nfs4_call_sync_sequence(clnt, server, &msg,
8278                                                 &args.seq_args, &res.seq_res);
8279         nfs_free_fhandle(res.fh);
8280         if (status == NFS4_OK &&
8281             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8282                 status = -NFS4ERR_LEASE_MOVED;
8283         return status;
8284 }
8285
8286 #endif  /* CONFIG_NFS_V4_1 */
8287
8288 /**
8289  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8290  * @inode: inode on FSID to check
8291  * @cred: credential to use for this operation
8292  *
8293  * Server indicates whether the FSID is present, moved, or not
8294  * recognized.  This operation is necessary to clear a LEASE_MOVED
8295  * condition for this client ID.
8296  *
8297  * Returns NFS4_OK if the FSID is present on this server,
8298  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8299  *  NFS4ERR code if some error occurred on the server, or a
8300  *  negative errno if a local failure occurred.
8301  */
8302 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8303 {
8304         struct nfs_server *server = NFS_SERVER(inode);
8305         struct nfs_client *clp = server->nfs_client;
8306         const struct nfs4_mig_recovery_ops *ops =
8307                                         clp->cl_mvops->mig_recovery_ops;
8308         struct nfs4_exception exception = {
8309                 .interruptible = true,
8310         };
8311         int status;
8312
8313         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8314                 (unsigned long long)server->fsid.major,
8315                 (unsigned long long)server->fsid.minor,
8316                 clp->cl_hostname);
8317         nfs_display_fhandle(NFS_FH(inode), __func__);
8318
8319         do {
8320                 status = ops->fsid_present(inode, cred);
8321                 if (status != -NFS4ERR_DELAY)
8322                         break;
8323                 nfs4_handle_exception(server, status, &exception);
8324         } while (exception.retry);
8325         return status;
8326 }
8327
8328 /*
8329  * If 'use_integrity' is true and the state managment nfs_client
8330  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8331  * and the machine credential as per RFC3530bis and RFC5661 Security
8332  * Considerations sections. Otherwise, just use the user cred with the
8333  * filesystem's rpc_client.
8334  */
8335 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8336 {
8337         int status;
8338         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8339         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8340         struct nfs4_secinfo_arg args = {
8341                 .dir_fh = NFS_FH(dir),
8342                 .name   = name,
8343         };
8344         struct nfs4_secinfo_res res = {
8345                 .flavors     = flavors,
8346         };
8347         struct rpc_message msg = {
8348                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8349                 .rpc_argp = &args,
8350                 .rpc_resp = &res,
8351         };
8352         struct nfs4_call_sync_data data = {
8353                 .seq_server = NFS_SERVER(dir),
8354                 .seq_args = &args.seq_args,
8355                 .seq_res = &res.seq_res,
8356         };
8357         struct rpc_task_setup task_setup = {
8358                 .rpc_client = clnt,
8359                 .rpc_message = &msg,
8360                 .callback_ops = clp->cl_mvops->call_sync_ops,
8361                 .callback_data = &data,
8362                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8363         };
8364         const struct cred *cred = NULL;
8365
8366         if (use_integrity) {
8367                 clnt = clp->cl_rpcclient;
8368                 task_setup.rpc_client = clnt;
8369
8370                 cred = nfs4_get_clid_cred(clp);
8371                 msg.rpc_cred = cred;
8372         }
8373
8374         dprintk("NFS call  secinfo %s\n", name->name);
8375
8376         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8377         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8378         status = nfs4_call_sync_custom(&task_setup);
8379
8380         dprintk("NFS reply  secinfo: %d\n", status);
8381
8382         put_cred(cred);
8383         return status;
8384 }
8385
8386 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8387                       struct nfs4_secinfo_flavors *flavors)
8388 {
8389         struct nfs4_exception exception = {
8390                 .interruptible = true,
8391         };
8392         int err;
8393         do {
8394                 err = -NFS4ERR_WRONGSEC;
8395
8396                 /* try to use integrity protection with machine cred */
8397                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8398                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8399
8400                 /*
8401                  * if unable to use integrity protection, or SECINFO with
8402                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8403                  * disallowed by spec, but exists in deployed servers) use
8404                  * the current filesystem's rpc_client and the user cred.
8405                  */
8406                 if (err == -NFS4ERR_WRONGSEC)
8407                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8408
8409                 trace_nfs4_secinfo(dir, name, err);
8410                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8411                                 &exception);
8412         } while (exception.retry);
8413         return err;
8414 }
8415
8416 #ifdef CONFIG_NFS_V4_1
8417 /*
8418  * Check the exchange flags returned by the server for invalid flags, having
8419  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8420  * DS flags set.
8421  */
8422 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8423 {
8424         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8425                 goto out_inval;
8426         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8427                 goto out_inval;
8428         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8429             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8430                 goto out_inval;
8431         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8432                 goto out_inval;
8433         return NFS_OK;
8434 out_inval:
8435         return -NFS4ERR_INVAL;
8436 }
8437
8438 static bool
8439 nfs41_same_server_scope(struct nfs41_server_scope *a,
8440                         struct nfs41_server_scope *b)
8441 {
8442         if (a->server_scope_sz != b->server_scope_sz)
8443                 return false;
8444         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8445 }
8446
8447 static void
8448 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8449 {
8450         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8451         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8452         struct nfs_client *clp = args->client;
8453
8454         switch (task->tk_status) {
8455         case -NFS4ERR_BADSESSION:
8456         case -NFS4ERR_DEADSESSION:
8457                 nfs4_schedule_session_recovery(clp->cl_session,
8458                                 task->tk_status);
8459                 return;
8460         }
8461         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8462                         res->dir != NFS4_CDFS4_BOTH) {
8463                 rpc_task_close_connection(task);
8464                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8465                         rpc_restart_call(task);
8466         }
8467 }
8468
8469 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8470         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8471 };
8472
8473 /*
8474  * nfs4_proc_bind_one_conn_to_session()
8475  *
8476  * The 4.1 client currently uses the same TCP connection for the
8477  * fore and backchannel.
8478  */
8479 static
8480 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8481                 struct rpc_xprt *xprt,
8482                 struct nfs_client *clp,
8483                 const struct cred *cred)
8484 {
8485         int status;
8486         struct nfs41_bind_conn_to_session_args args = {
8487                 .client = clp,
8488                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8489                 .retries = 0,
8490         };
8491         struct nfs41_bind_conn_to_session_res res;
8492         struct rpc_message msg = {
8493                 .rpc_proc =
8494                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8495                 .rpc_argp = &args,
8496                 .rpc_resp = &res,
8497                 .rpc_cred = cred,
8498         };
8499         struct rpc_task_setup task_setup_data = {
8500                 .rpc_client = clnt,
8501                 .rpc_xprt = xprt,
8502                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8503                 .rpc_message = &msg,
8504                 .flags = RPC_TASK_TIMEOUT,
8505         };
8506         struct rpc_task *task;
8507
8508         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8509         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8510                 args.dir = NFS4_CDFC4_FORE;
8511
8512         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8513         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8514                 args.dir = NFS4_CDFC4_FORE;
8515
8516         task = rpc_run_task(&task_setup_data);
8517         if (!IS_ERR(task)) {
8518                 status = task->tk_status;
8519                 rpc_put_task(task);
8520         } else
8521                 status = PTR_ERR(task);
8522         trace_nfs4_bind_conn_to_session(clp, status);
8523         if (status == 0) {
8524                 if (memcmp(res.sessionid.data,
8525                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8526                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8527                         return -EIO;
8528                 }
8529                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8530                         dprintk("NFS: %s: Unexpected direction from server\n",
8531                                 __func__);
8532                         return -EIO;
8533                 }
8534                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8535                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8536                                 __func__);
8537                         return -EIO;
8538                 }
8539         }
8540
8541         return status;
8542 }
8543
8544 struct rpc_bind_conn_calldata {
8545         struct nfs_client *clp;
8546         const struct cred *cred;
8547 };
8548
8549 static int
8550 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8551                 struct rpc_xprt *xprt,
8552                 void *calldata)
8553 {
8554         struct rpc_bind_conn_calldata *p = calldata;
8555
8556         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8557 }
8558
8559 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8560 {
8561         struct rpc_bind_conn_calldata data = {
8562                 .clp = clp,
8563                 .cred = cred,
8564         };
8565         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8566                         nfs4_proc_bind_conn_to_session_callback, &data);
8567 }
8568
8569 /*
8570  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8571  * and operations we'd like to see to enable certain features in the allow map
8572  */
8573 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8574         .how = SP4_MACH_CRED,
8575         .enforce.u.words = {
8576                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8577                       1 << (OP_EXCHANGE_ID - 32) |
8578                       1 << (OP_CREATE_SESSION - 32) |
8579                       1 << (OP_DESTROY_SESSION - 32) |
8580                       1 << (OP_DESTROY_CLIENTID - 32)
8581         },
8582         .allow.u.words = {
8583                 [0] = 1 << (OP_CLOSE) |
8584                       1 << (OP_OPEN_DOWNGRADE) |
8585                       1 << (OP_LOCKU) |
8586                       1 << (OP_DELEGRETURN) |
8587                       1 << (OP_COMMIT),
8588                 [1] = 1 << (OP_SECINFO - 32) |
8589                       1 << (OP_SECINFO_NO_NAME - 32) |
8590                       1 << (OP_LAYOUTRETURN - 32) |
8591                       1 << (OP_TEST_STATEID - 32) |
8592                       1 << (OP_FREE_STATEID - 32) |
8593                       1 << (OP_WRITE - 32)
8594         }
8595 };
8596
8597 /*
8598  * Select the state protection mode for client `clp' given the server results
8599  * from exchange_id in `sp'.
8600  *
8601  * Returns 0 on success, negative errno otherwise.
8602  */
8603 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8604                                  struct nfs41_state_protection *sp)
8605 {
8606         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8607                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8608                       1 << (OP_EXCHANGE_ID - 32) |
8609                       1 << (OP_CREATE_SESSION - 32) |
8610                       1 << (OP_DESTROY_SESSION - 32) |
8611                       1 << (OP_DESTROY_CLIENTID - 32)
8612         };
8613         unsigned long flags = 0;
8614         unsigned int i;
8615         int ret = 0;
8616
8617         if (sp->how == SP4_MACH_CRED) {
8618                 /* Print state protect result */
8619                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8620                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8621                         if (test_bit(i, sp->enforce.u.longs))
8622                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8623                         if (test_bit(i, sp->allow.u.longs))
8624                                 dfprintk(MOUNT, "  allow op %d\n", i);
8625                 }
8626
8627                 /* make sure nothing is on enforce list that isn't supported */
8628                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8629                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8630                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8631                                 ret = -EINVAL;
8632                                 goto out;
8633                         }
8634                 }
8635
8636                 /*
8637                  * Minimal mode - state operations are allowed to use machine
8638                  * credential.  Note this already happens by default, so the
8639                  * client doesn't have to do anything more than the negotiation.
8640                  *
8641                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8642                  *       we're already using the machine cred for exchange_id
8643                  *       and will never use a different cred.
8644                  */
8645                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8646                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8647                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8648                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8649                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8650                         dfprintk(MOUNT, "  minimal mode enabled\n");
8651                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8652                 } else {
8653                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8654                         ret = -EINVAL;
8655                         goto out;
8656                 }
8657
8658                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8659                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8660                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8661                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8662                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8663                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8664                 }
8665
8666                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8667                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8668                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8669                 }
8670
8671                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8672                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8673                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8674                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8675                 }
8676
8677                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8678                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8679                         dfprintk(MOUNT, "  stateid mode enabled\n");
8680                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8681                 }
8682
8683                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8684                         dfprintk(MOUNT, "  write mode enabled\n");
8685                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8686                 }
8687
8688                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8689                         dfprintk(MOUNT, "  commit mode enabled\n");
8690                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8691                 }
8692         }
8693 out:
8694         clp->cl_sp4_flags = flags;
8695         return ret;
8696 }
8697
8698 struct nfs41_exchange_id_data {
8699         struct nfs41_exchange_id_res res;
8700         struct nfs41_exchange_id_args args;
8701 };
8702
8703 static void nfs4_exchange_id_release(void *data)
8704 {
8705         struct nfs41_exchange_id_data *cdata =
8706                                         (struct nfs41_exchange_id_data *)data;
8707
8708         nfs_put_client(cdata->args.client);
8709         kfree(cdata->res.impl_id);
8710         kfree(cdata->res.server_scope);
8711         kfree(cdata->res.server_owner);
8712         kfree(cdata);
8713 }
8714
8715 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8716         .rpc_release = nfs4_exchange_id_release,
8717 };
8718
8719 /*
8720  * _nfs4_proc_exchange_id()
8721  *
8722  * Wrapper for EXCHANGE_ID operation.
8723  */
8724 static struct rpc_task *
8725 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8726                         u32 sp4_how, struct rpc_xprt *xprt)
8727 {
8728         struct rpc_message msg = {
8729                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8730                 .rpc_cred = cred,
8731         };
8732         struct rpc_task_setup task_setup_data = {
8733                 .rpc_client = clp->cl_rpcclient,
8734                 .callback_ops = &nfs4_exchange_id_call_ops,
8735                 .rpc_message = &msg,
8736                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8737         };
8738         struct nfs41_exchange_id_data *calldata;
8739         int status;
8740
8741         if (!refcount_inc_not_zero(&clp->cl_count))
8742                 return ERR_PTR(-EIO);
8743
8744         status = -ENOMEM;
8745         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8746         if (!calldata)
8747                 goto out;
8748
8749         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8750
8751         status = nfs4_init_uniform_client_string(clp);
8752         if (status)
8753                 goto out_calldata;
8754
8755         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8756                                                 GFP_NOFS);
8757         status = -ENOMEM;
8758         if (unlikely(calldata->res.server_owner == NULL))
8759                 goto out_calldata;
8760
8761         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8762                                         GFP_NOFS);
8763         if (unlikely(calldata->res.server_scope == NULL))
8764                 goto out_server_owner;
8765
8766         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8767         if (unlikely(calldata->res.impl_id == NULL))
8768                 goto out_server_scope;
8769
8770         switch (sp4_how) {
8771         case SP4_NONE:
8772                 calldata->args.state_protect.how = SP4_NONE;
8773                 break;
8774
8775         case SP4_MACH_CRED:
8776                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8777                 break;
8778
8779         default:
8780                 /* unsupported! */
8781                 WARN_ON_ONCE(1);
8782                 status = -EINVAL;
8783                 goto out_impl_id;
8784         }
8785         if (xprt) {
8786                 task_setup_data.rpc_xprt = xprt;
8787                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8788                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8789                                 sizeof(calldata->args.verifier.data));
8790         }
8791         calldata->args.client = clp;
8792         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8793         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8794 #ifdef CONFIG_NFS_V4_1_MIGRATION
8795         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8796 #endif
8797         if (test_bit(NFS_CS_DS, &clp->cl_flags))
8798                 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8799         msg.rpc_argp = &calldata->args;
8800         msg.rpc_resp = &calldata->res;
8801         task_setup_data.callback_data = calldata;
8802
8803         return rpc_run_task(&task_setup_data);
8804
8805 out_impl_id:
8806         kfree(calldata->res.impl_id);
8807 out_server_scope:
8808         kfree(calldata->res.server_scope);
8809 out_server_owner:
8810         kfree(calldata->res.server_owner);
8811 out_calldata:
8812         kfree(calldata);
8813 out:
8814         nfs_put_client(clp);
8815         return ERR_PTR(status);
8816 }
8817
8818 /*
8819  * _nfs4_proc_exchange_id()
8820  *
8821  * Wrapper for EXCHANGE_ID operation.
8822  */
8823 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8824                         u32 sp4_how)
8825 {
8826         struct rpc_task *task;
8827         struct nfs41_exchange_id_args *argp;
8828         struct nfs41_exchange_id_res *resp;
8829         unsigned long now = jiffies;
8830         int status;
8831
8832         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8833         if (IS_ERR(task))
8834                 return PTR_ERR(task);
8835
8836         argp = task->tk_msg.rpc_argp;
8837         resp = task->tk_msg.rpc_resp;
8838         status = task->tk_status;
8839         if (status  != 0)
8840                 goto out;
8841
8842         status = nfs4_check_cl_exchange_flags(resp->flags,
8843                         clp->cl_mvops->minor_version);
8844         if (status  != 0)
8845                 goto out;
8846
8847         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8848         if (status != 0)
8849                 goto out;
8850
8851         do_renew_lease(clp, now);
8852
8853         clp->cl_clientid = resp->clientid;
8854         clp->cl_exchange_flags = resp->flags;
8855         clp->cl_seqid = resp->seqid;
8856         /* Client ID is not confirmed */
8857         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8858                 clear_bit(NFS4_SESSION_ESTABLISHED,
8859                           &clp->cl_session->session_state);
8860
8861         if (clp->cl_serverscope != NULL &&
8862             !nfs41_same_server_scope(clp->cl_serverscope,
8863                                 resp->server_scope)) {
8864                 dprintk("%s: server_scope mismatch detected\n",
8865                         __func__);
8866                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8867         }
8868
8869         swap(clp->cl_serverowner, resp->server_owner);
8870         swap(clp->cl_serverscope, resp->server_scope);
8871         swap(clp->cl_implid, resp->impl_id);
8872
8873         /* Save the EXCHANGE_ID verifier session trunk tests */
8874         memcpy(clp->cl_confirm.data, argp->verifier.data,
8875                sizeof(clp->cl_confirm.data));
8876 out:
8877         trace_nfs4_exchange_id(clp, status);
8878         rpc_put_task(task);
8879         return status;
8880 }
8881
8882 /*
8883  * nfs4_proc_exchange_id()
8884  *
8885  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8886  *
8887  * Since the clientid has expired, all compounds using sessions
8888  * associated with the stale clientid will be returning
8889  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8890  * be in some phase of session reset.
8891  *
8892  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8893  */
8894 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8895 {
8896         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8897         int status;
8898
8899         /* try SP4_MACH_CRED if krb5i/p */
8900         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8901             authflavor == RPC_AUTH_GSS_KRB5P) {
8902                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8903                 if (!status)
8904                         return 0;
8905         }
8906
8907         /* try SP4_NONE */
8908         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8909 }
8910
8911 /**
8912  * nfs4_test_session_trunk
8913  *
8914  * This is an add_xprt_test() test function called from
8915  * rpc_clnt_setup_test_and_add_xprt.
8916  *
8917  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8918  * and is dereferrenced in nfs4_exchange_id_release
8919  *
8920  * Upon success, add the new transport to the rpc_clnt
8921  *
8922  * @clnt: struct rpc_clnt to get new transport
8923  * @xprt: the rpc_xprt to test
8924  * @data: call data for _nfs4_proc_exchange_id.
8925  */
8926 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8927                             void *data)
8928 {
8929         struct nfs4_add_xprt_data *adata = data;
8930         struct rpc_task *task;
8931         int status;
8932
8933         u32 sp4_how;
8934
8935         dprintk("--> %s try %s\n", __func__,
8936                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8937
8938         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8939
8940 try_again:
8941         /* Test connection for session trunking. Async exchange_id call */
8942         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8943         if (IS_ERR(task))
8944                 return;
8945
8946         status = task->tk_status;
8947         if (status == 0)
8948                 status = nfs4_detect_session_trunking(adata->clp,
8949                                 task->tk_msg.rpc_resp, xprt);
8950
8951         if (status == 0)
8952                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8953         else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
8954                                 (struct sockaddr *)&xprt->addr))
8955                 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8956
8957         rpc_put_task(task);
8958         if (status == -NFS4ERR_DELAY) {
8959                 ssleep(1);
8960                 goto try_again;
8961         }
8962 }
8963 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8964
8965 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8966                 const struct cred *cred)
8967 {
8968         struct rpc_message msg = {
8969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8970                 .rpc_argp = clp,
8971                 .rpc_cred = cred,
8972         };
8973         int status;
8974
8975         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8976                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8977         trace_nfs4_destroy_clientid(clp, status);
8978         if (status)
8979                 dprintk("NFS: Got error %d from the server %s on "
8980                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8981         return status;
8982 }
8983
8984 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8985                 const struct cred *cred)
8986 {
8987         unsigned int loop;
8988         int ret;
8989
8990         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8991                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8992                 switch (ret) {
8993                 case -NFS4ERR_DELAY:
8994                 case -NFS4ERR_CLIENTID_BUSY:
8995                         ssleep(1);
8996                         break;
8997                 default:
8998                         return ret;
8999                 }
9000         }
9001         return 0;
9002 }
9003
9004 int nfs4_destroy_clientid(struct nfs_client *clp)
9005 {
9006         const struct cred *cred;
9007         int ret = 0;
9008
9009         if (clp->cl_mvops->minor_version < 1)
9010                 goto out;
9011         if (clp->cl_exchange_flags == 0)
9012                 goto out;
9013         if (clp->cl_preserve_clid)
9014                 goto out;
9015         cred = nfs4_get_clid_cred(clp);
9016         ret = nfs4_proc_destroy_clientid(clp, cred);
9017         put_cred(cred);
9018         switch (ret) {
9019         case 0:
9020         case -NFS4ERR_STALE_CLIENTID:
9021                 clp->cl_exchange_flags = 0;
9022         }
9023 out:
9024         return ret;
9025 }
9026
9027 #endif /* CONFIG_NFS_V4_1 */
9028
9029 struct nfs4_get_lease_time_data {
9030         struct nfs4_get_lease_time_args *args;
9031         struct nfs4_get_lease_time_res *res;
9032         struct nfs_client *clp;
9033 };
9034
9035 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9036                                         void *calldata)
9037 {
9038         struct nfs4_get_lease_time_data *data =
9039                         (struct nfs4_get_lease_time_data *)calldata;
9040
9041         /* just setup sequence, do not trigger session recovery
9042            since we're invoked within one */
9043         nfs4_setup_sequence(data->clp,
9044                         &data->args->la_seq_args,
9045                         &data->res->lr_seq_res,
9046                         task);
9047 }
9048
9049 /*
9050  * Called from nfs4_state_manager thread for session setup, so don't recover
9051  * from sequence operation or clientid errors.
9052  */
9053 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9054 {
9055         struct nfs4_get_lease_time_data *data =
9056                         (struct nfs4_get_lease_time_data *)calldata;
9057
9058         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9059                 return;
9060         switch (task->tk_status) {
9061         case -NFS4ERR_DELAY:
9062         case -NFS4ERR_GRACE:
9063                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9064                 task->tk_status = 0;
9065                 fallthrough;
9066         case -NFS4ERR_RETRY_UNCACHED_REP:
9067                 rpc_restart_call_prepare(task);
9068                 return;
9069         }
9070 }
9071
9072 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9073         .rpc_call_prepare = nfs4_get_lease_time_prepare,
9074         .rpc_call_done = nfs4_get_lease_time_done,
9075 };
9076
9077 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9078 {
9079         struct nfs4_get_lease_time_args args;
9080         struct nfs4_get_lease_time_res res = {
9081                 .lr_fsinfo = fsinfo,
9082         };
9083         struct nfs4_get_lease_time_data data = {
9084                 .args = &args,
9085                 .res = &res,
9086                 .clp = clp,
9087         };
9088         struct rpc_message msg = {
9089                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9090                 .rpc_argp = &args,
9091                 .rpc_resp = &res,
9092         };
9093         struct rpc_task_setup task_setup = {
9094                 .rpc_client = clp->cl_rpcclient,
9095                 .rpc_message = &msg,
9096                 .callback_ops = &nfs4_get_lease_time_ops,
9097                 .callback_data = &data,
9098                 .flags = RPC_TASK_TIMEOUT,
9099         };
9100
9101         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9102         return nfs4_call_sync_custom(&task_setup);
9103 }
9104
9105 #ifdef CONFIG_NFS_V4_1
9106
9107 /*
9108  * Initialize the values to be used by the client in CREATE_SESSION
9109  * If nfs4_init_session set the fore channel request and response sizes,
9110  * use them.
9111  *
9112  * Set the back channel max_resp_sz_cached to zero to force the client to
9113  * always set csa_cachethis to FALSE because the current implementation
9114  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9115  */
9116 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9117                                     struct rpc_clnt *clnt)
9118 {
9119         unsigned int max_rqst_sz, max_resp_sz;
9120         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9121         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9122
9123         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9124         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9125
9126         /* Fore channel attributes */
9127         args->fc_attrs.max_rqst_sz = max_rqst_sz;
9128         args->fc_attrs.max_resp_sz = max_resp_sz;
9129         args->fc_attrs.max_ops = NFS4_MAX_OPS;
9130         args->fc_attrs.max_reqs = max_session_slots;
9131
9132         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9133                 "max_ops=%u max_reqs=%u\n",
9134                 __func__,
9135                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9136                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9137
9138         /* Back channel attributes */
9139         args->bc_attrs.max_rqst_sz = max_bc_payload;
9140         args->bc_attrs.max_resp_sz = max_bc_payload;
9141         args->bc_attrs.max_resp_sz_cached = 0;
9142         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9143         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9144         if (args->bc_attrs.max_reqs > max_bc_slots)
9145                 args->bc_attrs.max_reqs = max_bc_slots;
9146
9147         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9148                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9149                 __func__,
9150                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9151                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9152                 args->bc_attrs.max_reqs);
9153 }
9154
9155 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9156                 struct nfs41_create_session_res *res)
9157 {
9158         struct nfs4_channel_attrs *sent = &args->fc_attrs;
9159         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9160
9161         if (rcvd->max_resp_sz > sent->max_resp_sz)
9162                 return -EINVAL;
9163         /*
9164          * Our requested max_ops is the minimum we need; we're not
9165          * prepared to break up compounds into smaller pieces than that.
9166          * So, no point even trying to continue if the server won't
9167          * cooperate:
9168          */
9169         if (rcvd->max_ops < sent->max_ops)
9170                 return -EINVAL;
9171         if (rcvd->max_reqs == 0)
9172                 return -EINVAL;
9173         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9174                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9175         return 0;
9176 }
9177
9178 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9179                 struct nfs41_create_session_res *res)
9180 {
9181         struct nfs4_channel_attrs *sent = &args->bc_attrs;
9182         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9183
9184         if (!(res->flags & SESSION4_BACK_CHAN))
9185                 goto out;
9186         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9187                 return -EINVAL;
9188         if (rcvd->max_resp_sz < sent->max_resp_sz)
9189                 return -EINVAL;
9190         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9191                 return -EINVAL;
9192         if (rcvd->max_ops > sent->max_ops)
9193                 return -EINVAL;
9194         if (rcvd->max_reqs > sent->max_reqs)
9195                 return -EINVAL;
9196 out:
9197         return 0;
9198 }
9199
9200 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9201                                      struct nfs41_create_session_res *res)
9202 {
9203         int ret;
9204
9205         ret = nfs4_verify_fore_channel_attrs(args, res);
9206         if (ret)
9207                 return ret;
9208         return nfs4_verify_back_channel_attrs(args, res);
9209 }
9210
9211 static void nfs4_update_session(struct nfs4_session *session,
9212                 struct nfs41_create_session_res *res)
9213 {
9214         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9215         /* Mark client id and session as being confirmed */
9216         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9217         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9218         session->flags = res->flags;
9219         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9220         if (res->flags & SESSION4_BACK_CHAN)
9221                 memcpy(&session->bc_attrs, &res->bc_attrs,
9222                                 sizeof(session->bc_attrs));
9223 }
9224
9225 static int _nfs4_proc_create_session(struct nfs_client *clp,
9226                 const struct cred *cred)
9227 {
9228         struct nfs4_session *session = clp->cl_session;
9229         struct nfs41_create_session_args args = {
9230                 .client = clp,
9231                 .clientid = clp->cl_clientid,
9232                 .seqid = clp->cl_seqid,
9233                 .cb_program = NFS4_CALLBACK,
9234         };
9235         struct nfs41_create_session_res res;
9236
9237         struct rpc_message msg = {
9238                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9239                 .rpc_argp = &args,
9240                 .rpc_resp = &res,
9241                 .rpc_cred = cred,
9242         };
9243         int status;
9244
9245         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9246         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9247
9248         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9249                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9250         trace_nfs4_create_session(clp, status);
9251
9252         switch (status) {
9253         case -NFS4ERR_STALE_CLIENTID:
9254         case -NFS4ERR_DELAY:
9255         case -ETIMEDOUT:
9256         case -EACCES:
9257         case -EAGAIN:
9258                 goto out;
9259         }
9260
9261         clp->cl_seqid++;
9262         if (!status) {
9263                 /* Verify the session's negotiated channel_attrs values */
9264                 status = nfs4_verify_channel_attrs(&args, &res);
9265                 /* Increment the clientid slot sequence id */
9266                 if (status)
9267                         goto out;
9268                 nfs4_update_session(session, &res);
9269         }
9270 out:
9271         return status;
9272 }
9273
9274 /*
9275  * Issues a CREATE_SESSION operation to the server.
9276  * It is the responsibility of the caller to verify the session is
9277  * expired before calling this routine.
9278  */
9279 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9280 {
9281         int status;
9282         unsigned *ptr;
9283         struct nfs4_session *session = clp->cl_session;
9284         struct nfs4_add_xprt_data xprtdata = {
9285                 .clp = clp,
9286         };
9287         struct rpc_add_xprt_test rpcdata = {
9288                 .add_xprt_test = clp->cl_mvops->session_trunk,
9289                 .data = &xprtdata,
9290         };
9291
9292         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9293
9294         status = _nfs4_proc_create_session(clp, cred);
9295         if (status)
9296                 goto out;
9297
9298         /* Init or reset the session slot tables */
9299         status = nfs4_setup_session_slot_tables(session);
9300         dprintk("slot table setup returned %d\n", status);
9301         if (status)
9302                 goto out;
9303
9304         ptr = (unsigned *)&session->sess_id.data[0];
9305         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9306                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9307         rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9308 out:
9309         return status;
9310 }
9311
9312 /*
9313  * Issue the over-the-wire RPC DESTROY_SESSION.
9314  * The caller must serialize access to this routine.
9315  */
9316 int nfs4_proc_destroy_session(struct nfs4_session *session,
9317                 const struct cred *cred)
9318 {
9319         struct rpc_message msg = {
9320                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9321                 .rpc_argp = session,
9322                 .rpc_cred = cred,
9323         };
9324         int status = 0;
9325
9326         /* session is still being setup */
9327         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9328                 return 0;
9329
9330         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9331                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9332         trace_nfs4_destroy_session(session->clp, status);
9333
9334         if (status)
9335                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9336                         "Session has been destroyed regardless...\n", status);
9337         rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9338         return status;
9339 }
9340
9341 /*
9342  * Renew the cl_session lease.
9343  */
9344 struct nfs4_sequence_data {
9345         struct nfs_client *clp;
9346         struct nfs4_sequence_args args;
9347         struct nfs4_sequence_res res;
9348 };
9349
9350 static void nfs41_sequence_release(void *data)
9351 {
9352         struct nfs4_sequence_data *calldata = data;
9353         struct nfs_client *clp = calldata->clp;
9354
9355         if (refcount_read(&clp->cl_count) > 1)
9356                 nfs4_schedule_state_renewal(clp);
9357         nfs_put_client(clp);
9358         kfree(calldata);
9359 }
9360
9361 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9362 {
9363         switch(task->tk_status) {
9364         case -NFS4ERR_DELAY:
9365                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9366                 return -EAGAIN;
9367         default:
9368                 nfs4_schedule_lease_recovery(clp);
9369         }
9370         return 0;
9371 }
9372
9373 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9374 {
9375         struct nfs4_sequence_data *calldata = data;
9376         struct nfs_client *clp = calldata->clp;
9377
9378         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9379                 return;
9380
9381         trace_nfs4_sequence(clp, task->tk_status);
9382         if (task->tk_status < 0 && !task->tk_client->cl_shutdown) {
9383                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9384                 if (refcount_read(&clp->cl_count) == 1)
9385                         return;
9386
9387                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9388                         rpc_restart_call_prepare(task);
9389                         return;
9390                 }
9391         }
9392         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9393 }
9394
9395 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9396 {
9397         struct nfs4_sequence_data *calldata = data;
9398         struct nfs_client *clp = calldata->clp;
9399         struct nfs4_sequence_args *args;
9400         struct nfs4_sequence_res *res;
9401
9402         args = task->tk_msg.rpc_argp;
9403         res = task->tk_msg.rpc_resp;
9404
9405         nfs4_setup_sequence(clp, args, res, task);
9406 }
9407
9408 static const struct rpc_call_ops nfs41_sequence_ops = {
9409         .rpc_call_done = nfs41_sequence_call_done,
9410         .rpc_call_prepare = nfs41_sequence_prepare,
9411         .rpc_release = nfs41_sequence_release,
9412 };
9413
9414 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9415                 const struct cred *cred,
9416                 struct nfs4_slot *slot,
9417                 bool is_privileged)
9418 {
9419         struct nfs4_sequence_data *calldata;
9420         struct rpc_message msg = {
9421                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9422                 .rpc_cred = cred,
9423         };
9424         struct rpc_task_setup task_setup_data = {
9425                 .rpc_client = clp->cl_rpcclient,
9426                 .rpc_message = &msg,
9427                 .callback_ops = &nfs41_sequence_ops,
9428                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9429         };
9430         struct rpc_task *ret;
9431
9432         ret = ERR_PTR(-EIO);
9433         if (!refcount_inc_not_zero(&clp->cl_count))
9434                 goto out_err;
9435
9436         ret = ERR_PTR(-ENOMEM);
9437         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9438         if (calldata == NULL)
9439                 goto out_put_clp;
9440         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9441         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9442         msg.rpc_argp = &calldata->args;
9443         msg.rpc_resp = &calldata->res;
9444         calldata->clp = clp;
9445         task_setup_data.callback_data = calldata;
9446
9447         ret = rpc_run_task(&task_setup_data);
9448         if (IS_ERR(ret))
9449                 goto out_err;
9450         return ret;
9451 out_put_clp:
9452         nfs_put_client(clp);
9453 out_err:
9454         nfs41_release_slot(slot);
9455         return ret;
9456 }
9457
9458 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9459 {
9460         struct rpc_task *task;
9461         int ret = 0;
9462
9463         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9464                 return -EAGAIN;
9465         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9466         if (IS_ERR(task))
9467                 ret = PTR_ERR(task);
9468         else
9469                 rpc_put_task_async(task);
9470         dprintk("<-- %s status=%d\n", __func__, ret);
9471         return ret;
9472 }
9473
9474 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9475 {
9476         struct rpc_task *task;
9477         int ret;
9478
9479         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9480         if (IS_ERR(task)) {
9481                 ret = PTR_ERR(task);
9482                 goto out;
9483         }
9484         ret = rpc_wait_for_completion_task(task);
9485         if (!ret)
9486                 ret = task->tk_status;
9487         rpc_put_task(task);
9488 out:
9489         dprintk("<-- %s status=%d\n", __func__, ret);
9490         return ret;
9491 }
9492
9493 struct nfs4_reclaim_complete_data {
9494         struct nfs_client *clp;
9495         struct nfs41_reclaim_complete_args arg;
9496         struct nfs41_reclaim_complete_res res;
9497 };
9498
9499 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9500 {
9501         struct nfs4_reclaim_complete_data *calldata = data;
9502
9503         nfs4_setup_sequence(calldata->clp,
9504                         &calldata->arg.seq_args,
9505                         &calldata->res.seq_res,
9506                         task);
9507 }
9508
9509 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9510 {
9511         switch(task->tk_status) {
9512         case 0:
9513                 wake_up_all(&clp->cl_lock_waitq);
9514                 fallthrough;
9515         case -NFS4ERR_COMPLETE_ALREADY:
9516         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9517                 break;
9518         case -NFS4ERR_DELAY:
9519                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9520                 fallthrough;
9521         case -NFS4ERR_RETRY_UNCACHED_REP:
9522         case -EACCES:
9523                 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9524                         __func__, task->tk_status, clp->cl_hostname);
9525                 return -EAGAIN;
9526         case -NFS4ERR_BADSESSION:
9527         case -NFS4ERR_DEADSESSION:
9528         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9529                 break;
9530         default:
9531                 nfs4_schedule_lease_recovery(clp);
9532         }
9533         return 0;
9534 }
9535
9536 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9537 {
9538         struct nfs4_reclaim_complete_data *calldata = data;
9539         struct nfs_client *clp = calldata->clp;
9540         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9541
9542         if (!nfs41_sequence_done(task, res))
9543                 return;
9544
9545         trace_nfs4_reclaim_complete(clp, task->tk_status);
9546         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9547                 rpc_restart_call_prepare(task);
9548                 return;
9549         }
9550 }
9551
9552 static void nfs4_free_reclaim_complete_data(void *data)
9553 {
9554         struct nfs4_reclaim_complete_data *calldata = data;
9555
9556         kfree(calldata);
9557 }
9558
9559 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9560         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9561         .rpc_call_done = nfs4_reclaim_complete_done,
9562         .rpc_release = nfs4_free_reclaim_complete_data,
9563 };
9564
9565 /*
9566  * Issue a global reclaim complete.
9567  */
9568 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9569                 const struct cred *cred)
9570 {
9571         struct nfs4_reclaim_complete_data *calldata;
9572         struct rpc_message msg = {
9573                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9574                 .rpc_cred = cred,
9575         };
9576         struct rpc_task_setup task_setup_data = {
9577                 .rpc_client = clp->cl_rpcclient,
9578                 .rpc_message = &msg,
9579                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9580                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9581         };
9582         int status = -ENOMEM;
9583
9584         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9585         if (calldata == NULL)
9586                 goto out;
9587         calldata->clp = clp;
9588         calldata->arg.one_fs = 0;
9589
9590         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9591         msg.rpc_argp = &calldata->arg;
9592         msg.rpc_resp = &calldata->res;
9593         task_setup_data.callback_data = calldata;
9594         status = nfs4_call_sync_custom(&task_setup_data);
9595 out:
9596         dprintk("<-- %s status=%d\n", __func__, status);
9597         return status;
9598 }
9599
9600 static void
9601 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9602 {
9603         struct nfs4_layoutget *lgp = calldata;
9604         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9605
9606         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9607                                 &lgp->res.seq_res, task);
9608 }
9609
9610 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9611 {
9612         struct nfs4_layoutget *lgp = calldata;
9613
9614         nfs41_sequence_process(task, &lgp->res.seq_res);
9615 }
9616
9617 static int
9618 nfs4_layoutget_handle_exception(struct rpc_task *task,
9619                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9620 {
9621         struct inode *inode = lgp->args.inode;
9622         struct nfs_server *server = NFS_SERVER(inode);
9623         struct pnfs_layout_hdr *lo = lgp->lo;
9624         int nfs4err = task->tk_status;
9625         int err, status = 0;
9626         LIST_HEAD(head);
9627
9628         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9629
9630         nfs4_sequence_free_slot(&lgp->res.seq_res);
9631
9632         switch (nfs4err) {
9633         case 0:
9634                 goto out;
9635
9636         /*
9637          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9638          * on the file. set tk_status to -ENODATA to tell upper layer to
9639          * retry go inband.
9640          */
9641         case -NFS4ERR_LAYOUTUNAVAILABLE:
9642                 status = -ENODATA;
9643                 goto out;
9644         /*
9645          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9646          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9647          */
9648         case -NFS4ERR_BADLAYOUT:
9649                 status = -EOVERFLOW;
9650                 goto out;
9651         /*
9652          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9653          * (or clients) writing to the same RAID stripe except when
9654          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9655          *
9656          * Treat it like we would RECALLCONFLICT -- we retry for a little
9657          * while, and then eventually give up.
9658          */
9659         case -NFS4ERR_LAYOUTTRYLATER:
9660                 if (lgp->args.minlength == 0) {
9661                         status = -EOVERFLOW;
9662                         goto out;
9663                 }
9664                 status = -EBUSY;
9665                 break;
9666         case -NFS4ERR_RECALLCONFLICT:
9667         case -NFS4ERR_RETURNCONFLICT:
9668                 status = -ERECALLCONFLICT;
9669                 break;
9670         case -NFS4ERR_DELEG_REVOKED:
9671         case -NFS4ERR_ADMIN_REVOKED:
9672         case -NFS4ERR_EXPIRED:
9673         case -NFS4ERR_BAD_STATEID:
9674                 exception->timeout = 0;
9675                 spin_lock(&inode->i_lock);
9676                 /* If the open stateid was bad, then recover it. */
9677                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9678                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9679                         spin_unlock(&inode->i_lock);
9680                         exception->state = lgp->args.ctx->state;
9681                         exception->stateid = &lgp->args.stateid;
9682                         break;
9683                 }
9684
9685                 /*
9686                  * Mark the bad layout state as invalid, then retry
9687                  */
9688                 pnfs_mark_layout_stateid_invalid(lo, &head);
9689                 spin_unlock(&inode->i_lock);
9690                 nfs_commit_inode(inode, 0);
9691                 pnfs_free_lseg_list(&head);
9692                 status = -EAGAIN;
9693                 goto out;
9694         }
9695
9696         err = nfs4_handle_exception(server, nfs4err, exception);
9697         if (!status) {
9698                 if (exception->retry)
9699                         status = -EAGAIN;
9700                 else
9701                         status = err;
9702         }
9703 out:
9704         return status;
9705 }
9706
9707 size_t max_response_pages(struct nfs_server *server)
9708 {
9709         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9710         return nfs_page_array_len(0, max_resp_sz);
9711 }
9712
9713 static void nfs4_layoutget_release(void *calldata)
9714 {
9715         struct nfs4_layoutget *lgp = calldata;
9716
9717         nfs4_sequence_free_slot(&lgp->res.seq_res);
9718         pnfs_layoutget_free(lgp);
9719 }
9720
9721 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9722         .rpc_call_prepare = nfs4_layoutget_prepare,
9723         .rpc_call_done = nfs4_layoutget_done,
9724         .rpc_release = nfs4_layoutget_release,
9725 };
9726
9727 struct pnfs_layout_segment *
9728 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9729 {
9730         struct inode *inode = lgp->args.inode;
9731         struct nfs_server *server = NFS_SERVER(inode);
9732         struct rpc_task *task;
9733         struct rpc_message msg = {
9734                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9735                 .rpc_argp = &lgp->args,
9736                 .rpc_resp = &lgp->res,
9737                 .rpc_cred = lgp->cred,
9738         };
9739         struct rpc_task_setup task_setup_data = {
9740                 .rpc_client = server->client,
9741                 .rpc_message = &msg,
9742                 .callback_ops = &nfs4_layoutget_call_ops,
9743                 .callback_data = lgp,
9744                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9745                          RPC_TASK_MOVEABLE,
9746         };
9747         struct pnfs_layout_segment *lseg = NULL;
9748         struct nfs4_exception exception = {
9749                 .inode = inode,
9750                 .timeout = *timeout,
9751         };
9752         int status = 0;
9753
9754         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9755
9756         task = rpc_run_task(&task_setup_data);
9757         if (IS_ERR(task))
9758                 return ERR_CAST(task);
9759
9760         status = rpc_wait_for_completion_task(task);
9761         if (status != 0)
9762                 goto out;
9763
9764         if (task->tk_status < 0) {
9765                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9766                 *timeout = exception.timeout;
9767         } else if (lgp->res.layoutp->len == 0) {
9768                 status = -EAGAIN;
9769                 *timeout = nfs4_update_delay(&exception.timeout);
9770         } else
9771                 lseg = pnfs_layout_process(lgp);
9772 out:
9773         trace_nfs4_layoutget(lgp->args.ctx,
9774                         &lgp->args.range,
9775                         &lgp->res.range,
9776                         &lgp->res.stateid,
9777                         status);
9778
9779         rpc_put_task(task);
9780         dprintk("<-- %s status=%d\n", __func__, status);
9781         if (status)
9782                 return ERR_PTR(status);
9783         return lseg;
9784 }
9785
9786 static void
9787 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9788 {
9789         struct nfs4_layoutreturn *lrp = calldata;
9790
9791         nfs4_setup_sequence(lrp->clp,
9792                         &lrp->args.seq_args,
9793                         &lrp->res.seq_res,
9794                         task);
9795         if (!pnfs_layout_is_valid(lrp->args.layout))
9796                 rpc_exit(task, 0);
9797 }
9798
9799 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9800 {
9801         struct nfs4_layoutreturn *lrp = calldata;
9802         struct nfs_server *server;
9803
9804         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9805                 return;
9806
9807         /*
9808          * Was there an RPC level error? Assume the call succeeded,
9809          * and that we need to release the layout
9810          */
9811         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9812                 lrp->res.lrs_present = 0;
9813                 return;
9814         }
9815
9816         server = NFS_SERVER(lrp->args.inode);
9817         switch (task->tk_status) {
9818         case -NFS4ERR_OLD_STATEID:
9819                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9820                                         &lrp->args.range,
9821                                         lrp->args.inode))
9822                         goto out_restart;
9823                 fallthrough;
9824         default:
9825                 task->tk_status = 0;
9826                 fallthrough;
9827         case 0:
9828                 break;
9829         case -NFS4ERR_DELAY:
9830                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9831                         break;
9832                 goto out_restart;
9833         }
9834         return;
9835 out_restart:
9836         task->tk_status = 0;
9837         nfs4_sequence_free_slot(&lrp->res.seq_res);
9838         rpc_restart_call_prepare(task);
9839 }
9840
9841 static void nfs4_layoutreturn_release(void *calldata)
9842 {
9843         struct nfs4_layoutreturn *lrp = calldata;
9844         struct pnfs_layout_hdr *lo = lrp->args.layout;
9845
9846         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9847                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9848         nfs4_sequence_free_slot(&lrp->res.seq_res);
9849         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9850                 lrp->ld_private.ops->free(&lrp->ld_private);
9851         pnfs_put_layout_hdr(lrp->args.layout);
9852         nfs_iput_and_deactive(lrp->inode);
9853         put_cred(lrp->cred);
9854         kfree(calldata);
9855 }
9856
9857 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9858         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9859         .rpc_call_done = nfs4_layoutreturn_done,
9860         .rpc_release = nfs4_layoutreturn_release,
9861 };
9862
9863 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9864 {
9865         struct rpc_task *task;
9866         struct rpc_message msg = {
9867                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9868                 .rpc_argp = &lrp->args,
9869                 .rpc_resp = &lrp->res,
9870                 .rpc_cred = lrp->cred,
9871         };
9872         struct rpc_task_setup task_setup_data = {
9873                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9874                 .rpc_message = &msg,
9875                 .callback_ops = &nfs4_layoutreturn_call_ops,
9876                 .callback_data = lrp,
9877                 .flags = RPC_TASK_MOVEABLE,
9878         };
9879         int status = 0;
9880
9881         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9882                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9883                         &task_setup_data.rpc_client, &msg);
9884
9885         lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9886         if (!sync) {
9887                 if (!lrp->inode) {
9888                         nfs4_layoutreturn_release(lrp);
9889                         return -EAGAIN;
9890                 }
9891                 task_setup_data.flags |= RPC_TASK_ASYNC;
9892         }
9893         if (!lrp->inode)
9894                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9895                                    1);
9896         else
9897                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9898                                    0);
9899         task = rpc_run_task(&task_setup_data);
9900         if (IS_ERR(task))
9901                 return PTR_ERR(task);
9902         if (sync)
9903                 status = task->tk_status;
9904         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9905         dprintk("<-- %s status=%d\n", __func__, status);
9906         rpc_put_task(task);
9907         return status;
9908 }
9909
9910 static int
9911 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9912                 struct pnfs_device *pdev,
9913                 const struct cred *cred)
9914 {
9915         struct nfs4_getdeviceinfo_args args = {
9916                 .pdev = pdev,
9917                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9918                         NOTIFY_DEVICEID4_DELETE,
9919         };
9920         struct nfs4_getdeviceinfo_res res = {
9921                 .pdev = pdev,
9922         };
9923         struct rpc_message msg = {
9924                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9925                 .rpc_argp = &args,
9926                 .rpc_resp = &res,
9927                 .rpc_cred = cred,
9928         };
9929         int status;
9930
9931         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9932         if (res.notification & ~args.notify_types)
9933                 dprintk("%s: unsupported notification\n", __func__);
9934         if (res.notification != args.notify_types)
9935                 pdev->nocache = 1;
9936
9937         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9938
9939         dprintk("<-- %s status=%d\n", __func__, status);
9940
9941         return status;
9942 }
9943
9944 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9945                 struct pnfs_device *pdev,
9946                 const struct cred *cred)
9947 {
9948         struct nfs4_exception exception = { };
9949         int err;
9950
9951         do {
9952                 err = nfs4_handle_exception(server,
9953                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9954                                         &exception);
9955         } while (exception.retry);
9956         return err;
9957 }
9958 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9959
9960 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9961 {
9962         struct nfs4_layoutcommit_data *data = calldata;
9963         struct nfs_server *server = NFS_SERVER(data->args.inode);
9964
9965         nfs4_setup_sequence(server->nfs_client,
9966                         &data->args.seq_args,
9967                         &data->res.seq_res,
9968                         task);
9969 }
9970
9971 static void
9972 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9973 {
9974         struct nfs4_layoutcommit_data *data = calldata;
9975         struct nfs_server *server = NFS_SERVER(data->args.inode);
9976
9977         if (!nfs41_sequence_done(task, &data->res.seq_res))
9978                 return;
9979
9980         switch (task->tk_status) { /* Just ignore these failures */
9981         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9982         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9983         case -NFS4ERR_BADLAYOUT:     /* no layout */
9984         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9985                 task->tk_status = 0;
9986                 break;
9987         case 0:
9988                 break;
9989         default:
9990                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9991                         rpc_restart_call_prepare(task);
9992                         return;
9993                 }
9994         }
9995 }
9996
9997 static void nfs4_layoutcommit_release(void *calldata)
9998 {
9999         struct nfs4_layoutcommit_data *data = calldata;
10000
10001         pnfs_cleanup_layoutcommit(data);
10002         nfs_post_op_update_inode_force_wcc(data->args.inode,
10003                                            data->res.fattr);
10004         put_cred(data->cred);
10005         nfs_iput_and_deactive(data->inode);
10006         kfree(data);
10007 }
10008
10009 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10010         .rpc_call_prepare = nfs4_layoutcommit_prepare,
10011         .rpc_call_done = nfs4_layoutcommit_done,
10012         .rpc_release = nfs4_layoutcommit_release,
10013 };
10014
10015 int
10016 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10017 {
10018         struct rpc_message msg = {
10019                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10020                 .rpc_argp = &data->args,
10021                 .rpc_resp = &data->res,
10022                 .rpc_cred = data->cred,
10023         };
10024         struct rpc_task_setup task_setup_data = {
10025                 .task = &data->task,
10026                 .rpc_client = NFS_CLIENT(data->args.inode),
10027                 .rpc_message = &msg,
10028                 .callback_ops = &nfs4_layoutcommit_ops,
10029                 .callback_data = data,
10030                 .flags = RPC_TASK_MOVEABLE,
10031         };
10032         struct rpc_task *task;
10033         int status = 0;
10034
10035         dprintk("NFS: initiating layoutcommit call. sync %d "
10036                 "lbw: %llu inode %lu\n", sync,
10037                 data->args.lastbytewritten,
10038                 data->args.inode->i_ino);
10039
10040         if (!sync) {
10041                 data->inode = nfs_igrab_and_active(data->args.inode);
10042                 if (data->inode == NULL) {
10043                         nfs4_layoutcommit_release(data);
10044                         return -EAGAIN;
10045                 }
10046                 task_setup_data.flags = RPC_TASK_ASYNC;
10047         }
10048         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10049         task = rpc_run_task(&task_setup_data);
10050         if (IS_ERR(task))
10051                 return PTR_ERR(task);
10052         if (sync)
10053                 status = task->tk_status;
10054         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10055         dprintk("%s: status %d\n", __func__, status);
10056         rpc_put_task(task);
10057         return status;
10058 }
10059
10060 /*
10061  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10062  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10063  */
10064 static int
10065 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10066                     struct nfs_fsinfo *info,
10067                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10068 {
10069         struct nfs41_secinfo_no_name_args args = {
10070                 .style = SECINFO_STYLE_CURRENT_FH,
10071         };
10072         struct nfs4_secinfo_res res = {
10073                 .flavors = flavors,
10074         };
10075         struct rpc_message msg = {
10076                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10077                 .rpc_argp = &args,
10078                 .rpc_resp = &res,
10079         };
10080         struct nfs4_call_sync_data data = {
10081                 .seq_server = server,
10082                 .seq_args = &args.seq_args,
10083                 .seq_res = &res.seq_res,
10084         };
10085         struct rpc_task_setup task_setup = {
10086                 .rpc_client = server->client,
10087                 .rpc_message = &msg,
10088                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10089                 .callback_data = &data,
10090                 .flags = RPC_TASK_NO_ROUND_ROBIN,
10091         };
10092         const struct cred *cred = NULL;
10093         int status;
10094
10095         if (use_integrity) {
10096                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10097
10098                 cred = nfs4_get_clid_cred(server->nfs_client);
10099                 msg.rpc_cred = cred;
10100         }
10101
10102         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10103         status = nfs4_call_sync_custom(&task_setup);
10104         dprintk("<-- %s status=%d\n", __func__, status);
10105
10106         put_cred(cred);
10107
10108         return status;
10109 }
10110
10111 static int
10112 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10113                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10114 {
10115         struct nfs4_exception exception = {
10116                 .interruptible = true,
10117         };
10118         int err;
10119         do {
10120                 /* first try using integrity protection */
10121                 err = -NFS4ERR_WRONGSEC;
10122
10123                 /* try to use integrity protection with machine cred */
10124                 if (_nfs4_is_integrity_protected(server->nfs_client))
10125                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10126                                                           flavors, true);
10127
10128                 /*
10129                  * if unable to use integrity protection, or SECINFO with
10130                  * integrity protection returns NFS4ERR_WRONGSEC (which is
10131                  * disallowed by spec, but exists in deployed servers) use
10132                  * the current filesystem's rpc_client and the user cred.
10133                  */
10134                 if (err == -NFS4ERR_WRONGSEC)
10135                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10136                                                           flavors, false);
10137
10138                 switch (err) {
10139                 case 0:
10140                 case -NFS4ERR_WRONGSEC:
10141                 case -ENOTSUPP:
10142                         goto out;
10143                 default:
10144                         err = nfs4_handle_exception(server, err, &exception);
10145                 }
10146         } while (exception.retry);
10147 out:
10148         return err;
10149 }
10150
10151 static int
10152 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10153                     struct nfs_fsinfo *info)
10154 {
10155         int err;
10156         struct page *page;
10157         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10158         struct nfs4_secinfo_flavors *flavors;
10159         struct nfs4_secinfo4 *secinfo;
10160         int i;
10161
10162         page = alloc_page(GFP_KERNEL);
10163         if (!page) {
10164                 err = -ENOMEM;
10165                 goto out;
10166         }
10167
10168         flavors = page_address(page);
10169         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10170
10171         /*
10172          * Fall back on "guess and check" method if
10173          * the server doesn't support SECINFO_NO_NAME
10174          */
10175         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10176                 err = nfs4_find_root_sec(server, fhandle, info);
10177                 goto out_freepage;
10178         }
10179         if (err)
10180                 goto out_freepage;
10181
10182         for (i = 0; i < flavors->num_flavors; i++) {
10183                 secinfo = &flavors->flavors[i];
10184
10185                 switch (secinfo->flavor) {
10186                 case RPC_AUTH_NULL:
10187                 case RPC_AUTH_UNIX:
10188                 case RPC_AUTH_GSS:
10189                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10190                                         &secinfo->flavor_info);
10191                         break;
10192                 default:
10193                         flavor = RPC_AUTH_MAXFLAVOR;
10194                         break;
10195                 }
10196
10197                 if (!nfs_auth_info_match(&server->auth_info, flavor))
10198                         flavor = RPC_AUTH_MAXFLAVOR;
10199
10200                 if (flavor != RPC_AUTH_MAXFLAVOR) {
10201                         err = nfs4_lookup_root_sec(server, fhandle,
10202                                                    info, flavor);
10203                         if (!err)
10204                                 break;
10205                 }
10206         }
10207
10208         if (flavor == RPC_AUTH_MAXFLAVOR)
10209                 err = -EPERM;
10210
10211 out_freepage:
10212         put_page(page);
10213         if (err == -EACCES)
10214                 return -EPERM;
10215 out:
10216         return err;
10217 }
10218
10219 static int _nfs41_test_stateid(struct nfs_server *server,
10220                 nfs4_stateid *stateid,
10221                 const struct cred *cred)
10222 {
10223         int status;
10224         struct nfs41_test_stateid_args args = {
10225                 .stateid = stateid,
10226         };
10227         struct nfs41_test_stateid_res res;
10228         struct rpc_message msg = {
10229                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10230                 .rpc_argp = &args,
10231                 .rpc_resp = &res,
10232                 .rpc_cred = cred,
10233         };
10234         struct rpc_clnt *rpc_client = server->client;
10235
10236         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10237                 &rpc_client, &msg);
10238
10239         dprintk("NFS call  test_stateid %p\n", stateid);
10240         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10241         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10242                         &args.seq_args, &res.seq_res);
10243         if (status != NFS_OK) {
10244                 dprintk("NFS reply test_stateid: failed, %d\n", status);
10245                 return status;
10246         }
10247         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10248         return -res.status;
10249 }
10250
10251 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10252                 int err, struct nfs4_exception *exception)
10253 {
10254         exception->retry = 0;
10255         switch(err) {
10256         case -NFS4ERR_DELAY:
10257         case -NFS4ERR_RETRY_UNCACHED_REP:
10258                 nfs4_handle_exception(server, err, exception);
10259                 break;
10260         case -NFS4ERR_BADSESSION:
10261         case -NFS4ERR_BADSLOT:
10262         case -NFS4ERR_BAD_HIGH_SLOT:
10263         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10264         case -NFS4ERR_DEADSESSION:
10265                 nfs4_do_handle_exception(server, err, exception);
10266         }
10267 }
10268
10269 /**
10270  * nfs41_test_stateid - perform a TEST_STATEID operation
10271  *
10272  * @server: server / transport on which to perform the operation
10273  * @stateid: state ID to test
10274  * @cred: credential
10275  *
10276  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10277  * Otherwise a negative NFS4ERR value is returned if the operation
10278  * failed or the state ID is not currently valid.
10279  */
10280 static int nfs41_test_stateid(struct nfs_server *server,
10281                 nfs4_stateid *stateid,
10282                 const struct cred *cred)
10283 {
10284         struct nfs4_exception exception = {
10285                 .interruptible = true,
10286         };
10287         int err;
10288         do {
10289                 err = _nfs41_test_stateid(server, stateid, cred);
10290                 nfs4_handle_delay_or_session_error(server, err, &exception);
10291         } while (exception.retry);
10292         return err;
10293 }
10294
10295 struct nfs_free_stateid_data {
10296         struct nfs_server *server;
10297         struct nfs41_free_stateid_args args;
10298         struct nfs41_free_stateid_res res;
10299 };
10300
10301 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10302 {
10303         struct nfs_free_stateid_data *data = calldata;
10304         nfs4_setup_sequence(data->server->nfs_client,
10305                         &data->args.seq_args,
10306                         &data->res.seq_res,
10307                         task);
10308 }
10309
10310 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10311 {
10312         struct nfs_free_stateid_data *data = calldata;
10313
10314         nfs41_sequence_done(task, &data->res.seq_res);
10315
10316         switch (task->tk_status) {
10317         case -NFS4ERR_DELAY:
10318                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10319                         rpc_restart_call_prepare(task);
10320         }
10321 }
10322
10323 static void nfs41_free_stateid_release(void *calldata)
10324 {
10325         struct nfs_free_stateid_data *data = calldata;
10326         struct nfs_client *clp = data->server->nfs_client;
10327
10328         nfs_put_client(clp);
10329         kfree(calldata);
10330 }
10331
10332 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10333         .rpc_call_prepare = nfs41_free_stateid_prepare,
10334         .rpc_call_done = nfs41_free_stateid_done,
10335         .rpc_release = nfs41_free_stateid_release,
10336 };
10337
10338 /**
10339  * nfs41_free_stateid - perform a FREE_STATEID operation
10340  *
10341  * @server: server / transport on which to perform the operation
10342  * @stateid: state ID to release
10343  * @cred: credential
10344  * @privileged: set to true if this call needs to be privileged
10345  *
10346  * Note: this function is always asynchronous.
10347  */
10348 static int nfs41_free_stateid(struct nfs_server *server,
10349                 const nfs4_stateid *stateid,
10350                 const struct cred *cred,
10351                 bool privileged)
10352 {
10353         struct rpc_message msg = {
10354                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10355                 .rpc_cred = cred,
10356         };
10357         struct rpc_task_setup task_setup = {
10358                 .rpc_client = server->client,
10359                 .rpc_message = &msg,
10360                 .callback_ops = &nfs41_free_stateid_ops,
10361                 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10362         };
10363         struct nfs_free_stateid_data *data;
10364         struct rpc_task *task;
10365         struct nfs_client *clp = server->nfs_client;
10366
10367         if (!refcount_inc_not_zero(&clp->cl_count))
10368                 return -EIO;
10369
10370         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10371                 &task_setup.rpc_client, &msg);
10372
10373         dprintk("NFS call  free_stateid %p\n", stateid);
10374         data = kmalloc(sizeof(*data), GFP_KERNEL);
10375         if (!data)
10376                 return -ENOMEM;
10377         data->server = server;
10378         nfs4_stateid_copy(&data->args.stateid, stateid);
10379
10380         task_setup.callback_data = data;
10381
10382         msg.rpc_argp = &data->args;
10383         msg.rpc_resp = &data->res;
10384         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10385         task = rpc_run_task(&task_setup);
10386         if (IS_ERR(task))
10387                 return PTR_ERR(task);
10388         rpc_put_task(task);
10389         return 0;
10390 }
10391
10392 static void
10393 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10394 {
10395         const struct cred *cred = lsp->ls_state->owner->so_cred;
10396
10397         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10398         nfs4_free_lock_state(server, lsp);
10399 }
10400
10401 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10402                 const nfs4_stateid *s2)
10403 {
10404         if (s1->type != s2->type)
10405                 return false;
10406
10407         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10408                 return false;
10409
10410         if (s1->seqid == s2->seqid)
10411                 return true;
10412
10413         return s1->seqid == 0 || s2->seqid == 0;
10414 }
10415
10416 #endif /* CONFIG_NFS_V4_1 */
10417
10418 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10419                 const nfs4_stateid *s2)
10420 {
10421         return nfs4_stateid_match(s1, s2);
10422 }
10423
10424
10425 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10426         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10427         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10428         .recover_open   = nfs4_open_reclaim,
10429         .recover_lock   = nfs4_lock_reclaim,
10430         .establish_clid = nfs4_init_clientid,
10431         .detect_trunking = nfs40_discover_server_trunking,
10432 };
10433
10434 #if defined(CONFIG_NFS_V4_1)
10435 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10436         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10437         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10438         .recover_open   = nfs4_open_reclaim,
10439         .recover_lock   = nfs4_lock_reclaim,
10440         .establish_clid = nfs41_init_clientid,
10441         .reclaim_complete = nfs41_proc_reclaim_complete,
10442         .detect_trunking = nfs41_discover_server_trunking,
10443 };
10444 #endif /* CONFIG_NFS_V4_1 */
10445
10446 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10447         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10448         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10449         .recover_open   = nfs40_open_expired,
10450         .recover_lock   = nfs4_lock_expired,
10451         .establish_clid = nfs4_init_clientid,
10452 };
10453
10454 #if defined(CONFIG_NFS_V4_1)
10455 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10456         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10457         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10458         .recover_open   = nfs41_open_expired,
10459         .recover_lock   = nfs41_lock_expired,
10460         .establish_clid = nfs41_init_clientid,
10461 };
10462 #endif /* CONFIG_NFS_V4_1 */
10463
10464 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10465         .sched_state_renewal = nfs4_proc_async_renew,
10466         .get_state_renewal_cred = nfs4_get_renew_cred,
10467         .renew_lease = nfs4_proc_renew,
10468 };
10469
10470 #if defined(CONFIG_NFS_V4_1)
10471 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10472         .sched_state_renewal = nfs41_proc_async_sequence,
10473         .get_state_renewal_cred = nfs4_get_machine_cred,
10474         .renew_lease = nfs4_proc_sequence,
10475 };
10476 #endif
10477
10478 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10479         .get_locations = _nfs40_proc_get_locations,
10480         .fsid_present = _nfs40_proc_fsid_present,
10481 };
10482
10483 #if defined(CONFIG_NFS_V4_1)
10484 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10485         .get_locations = _nfs41_proc_get_locations,
10486         .fsid_present = _nfs41_proc_fsid_present,
10487 };
10488 #endif  /* CONFIG_NFS_V4_1 */
10489
10490 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10491         .minor_version = 0,
10492         .init_caps = NFS_CAP_READDIRPLUS
10493                 | NFS_CAP_ATOMIC_OPEN
10494                 | NFS_CAP_POSIX_LOCK,
10495         .init_client = nfs40_init_client,
10496         .shutdown_client = nfs40_shutdown_client,
10497         .match_stateid = nfs4_match_stateid,
10498         .find_root_sec = nfs4_find_root_sec,
10499         .free_lock_state = nfs4_release_lockowner,
10500         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10501         .alloc_seqid = nfs_alloc_seqid,
10502         .call_sync_ops = &nfs40_call_sync_ops,
10503         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10504         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10505         .state_renewal_ops = &nfs40_state_renewal_ops,
10506         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10507 };
10508
10509 #if defined(CONFIG_NFS_V4_1)
10510 static struct nfs_seqid *
10511 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10512 {
10513         return NULL;
10514 }
10515
10516 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10517         .minor_version = 1,
10518         .init_caps = NFS_CAP_READDIRPLUS
10519                 | NFS_CAP_ATOMIC_OPEN
10520                 | NFS_CAP_POSIX_LOCK
10521                 | NFS_CAP_STATEID_NFSV41
10522                 | NFS_CAP_ATOMIC_OPEN_V1
10523                 | NFS_CAP_LGOPEN
10524                 | NFS_CAP_MOVEABLE,
10525         .init_client = nfs41_init_client,
10526         .shutdown_client = nfs41_shutdown_client,
10527         .match_stateid = nfs41_match_stateid,
10528         .find_root_sec = nfs41_find_root_sec,
10529         .free_lock_state = nfs41_free_lock_state,
10530         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10531         .alloc_seqid = nfs_alloc_no_seqid,
10532         .session_trunk = nfs4_test_session_trunk,
10533         .call_sync_ops = &nfs41_call_sync_ops,
10534         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10535         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10536         .state_renewal_ops = &nfs41_state_renewal_ops,
10537         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10538 };
10539 #endif
10540
10541 #if defined(CONFIG_NFS_V4_2)
10542 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10543         .minor_version = 2,
10544         .init_caps = NFS_CAP_READDIRPLUS
10545                 | NFS_CAP_ATOMIC_OPEN
10546                 | NFS_CAP_POSIX_LOCK
10547                 | NFS_CAP_STATEID_NFSV41
10548                 | NFS_CAP_ATOMIC_OPEN_V1
10549                 | NFS_CAP_LGOPEN
10550                 | NFS_CAP_ALLOCATE
10551                 | NFS_CAP_COPY
10552                 | NFS_CAP_OFFLOAD_CANCEL
10553                 | NFS_CAP_COPY_NOTIFY
10554                 | NFS_CAP_DEALLOCATE
10555                 | NFS_CAP_SEEK
10556                 | NFS_CAP_LAYOUTSTATS
10557                 | NFS_CAP_CLONE
10558                 | NFS_CAP_LAYOUTERROR
10559                 | NFS_CAP_READ_PLUS
10560                 | NFS_CAP_MOVEABLE,
10561         .init_client = nfs41_init_client,
10562         .shutdown_client = nfs41_shutdown_client,
10563         .match_stateid = nfs41_match_stateid,
10564         .find_root_sec = nfs41_find_root_sec,
10565         .free_lock_state = nfs41_free_lock_state,
10566         .call_sync_ops = &nfs41_call_sync_ops,
10567         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10568         .alloc_seqid = nfs_alloc_no_seqid,
10569         .session_trunk = nfs4_test_session_trunk,
10570         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10571         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10572         .state_renewal_ops = &nfs41_state_renewal_ops,
10573         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10574 };
10575 #endif
10576
10577 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10578         [0] = &nfs_v4_0_minor_ops,
10579 #if defined(CONFIG_NFS_V4_1)
10580         [1] = &nfs_v4_1_minor_ops,
10581 #endif
10582 #if defined(CONFIG_NFS_V4_2)
10583         [2] = &nfs_v4_2_minor_ops,
10584 #endif
10585 };
10586
10587 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10588 {
10589         ssize_t error, error2, error3;
10590
10591         error = generic_listxattr(dentry, list, size);
10592         if (error < 0)
10593                 return error;
10594         if (list) {
10595                 list += error;
10596                 size -= error;
10597         }
10598
10599         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10600         if (error2 < 0)
10601                 return error2;
10602
10603         if (list) {
10604                 list += error2;
10605                 size -= error2;
10606         }
10607
10608         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10609         if (error3 < 0)
10610                 return error3;
10611
10612         return error + error2 + error3;
10613 }
10614
10615 static void nfs4_enable_swap(struct inode *inode)
10616 {
10617         /* The state manager thread must always be running.
10618          * It will notice the client is a swapper, and stay put.
10619          */
10620         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10621
10622         nfs4_schedule_state_manager(clp);
10623 }
10624
10625 static void nfs4_disable_swap(struct inode *inode)
10626 {
10627         /* The state manager thread will now exit once it is
10628          * woken.
10629          */
10630         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10631
10632         set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10633         clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10634         wake_up_var(&clp->cl_state);
10635 }
10636
10637 static const struct inode_operations nfs4_dir_inode_operations = {
10638         .create         = nfs_create,
10639         .lookup         = nfs_lookup,
10640         .atomic_open    = nfs_atomic_open,
10641         .link           = nfs_link,
10642         .unlink         = nfs_unlink,
10643         .symlink        = nfs_symlink,
10644         .mkdir          = nfs_mkdir,
10645         .rmdir          = nfs_rmdir,
10646         .mknod          = nfs_mknod,
10647         .rename         = nfs_rename,
10648         .permission     = nfs_permission,
10649         .getattr        = nfs_getattr,
10650         .setattr        = nfs_setattr,
10651         .listxattr      = nfs4_listxattr,
10652 };
10653
10654 static const struct inode_operations nfs4_file_inode_operations = {
10655         .permission     = nfs_permission,
10656         .getattr        = nfs_getattr,
10657         .setattr        = nfs_setattr,
10658         .listxattr      = nfs4_listxattr,
10659 };
10660
10661 const struct nfs_rpc_ops nfs_v4_clientops = {
10662         .version        = 4,                    /* protocol version */
10663         .dentry_ops     = &nfs4_dentry_operations,
10664         .dir_inode_ops  = &nfs4_dir_inode_operations,
10665         .file_inode_ops = &nfs4_file_inode_operations,
10666         .file_ops       = &nfs4_file_operations,
10667         .getroot        = nfs4_proc_get_root,
10668         .submount       = nfs4_submount,
10669         .try_get_tree   = nfs4_try_get_tree,
10670         .getattr        = nfs4_proc_getattr,
10671         .setattr        = nfs4_proc_setattr,
10672         .lookup         = nfs4_proc_lookup,
10673         .lookupp        = nfs4_proc_lookupp,
10674         .access         = nfs4_proc_access,
10675         .readlink       = nfs4_proc_readlink,
10676         .create         = nfs4_proc_create,
10677         .remove         = nfs4_proc_remove,
10678         .unlink_setup   = nfs4_proc_unlink_setup,
10679         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10680         .unlink_done    = nfs4_proc_unlink_done,
10681         .rename_setup   = nfs4_proc_rename_setup,
10682         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10683         .rename_done    = nfs4_proc_rename_done,
10684         .link           = nfs4_proc_link,
10685         .symlink        = nfs4_proc_symlink,
10686         .mkdir          = nfs4_proc_mkdir,
10687         .rmdir          = nfs4_proc_rmdir,
10688         .readdir        = nfs4_proc_readdir,
10689         .mknod          = nfs4_proc_mknod,
10690         .statfs         = nfs4_proc_statfs,
10691         .fsinfo         = nfs4_proc_fsinfo,
10692         .pathconf       = nfs4_proc_pathconf,
10693         .set_capabilities = nfs4_server_capabilities,
10694         .decode_dirent  = nfs4_decode_dirent,
10695         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10696         .read_setup     = nfs4_proc_read_setup,
10697         .read_done      = nfs4_read_done,
10698         .write_setup    = nfs4_proc_write_setup,
10699         .write_done     = nfs4_write_done,
10700         .commit_setup   = nfs4_proc_commit_setup,
10701         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10702         .commit_done    = nfs4_commit_done,
10703         .lock           = nfs4_proc_lock,
10704         .clear_acl_cache = nfs4_zap_acl_attr,
10705         .close_context  = nfs4_close_context,
10706         .open_context   = nfs4_atomic_open,
10707         .have_delegation = nfs4_have_delegation,
10708         .alloc_client   = nfs4_alloc_client,
10709         .init_client    = nfs4_init_client,
10710         .free_client    = nfs4_free_client,
10711         .create_server  = nfs4_create_server,
10712         .clone_server   = nfs_clone_server,
10713         .discover_trunking = nfs4_discover_trunking,
10714         .enable_swap    = nfs4_enable_swap,
10715         .disable_swap   = nfs4_disable_swap,
10716 };
10717
10718 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10719         .name   = XATTR_NAME_NFSV4_ACL,
10720         .list   = nfs4_xattr_list_nfs4_acl,
10721         .get    = nfs4_xattr_get_nfs4_acl,
10722         .set    = nfs4_xattr_set_nfs4_acl,
10723 };
10724
10725 #if defined(CONFIG_NFS_V4_1)
10726 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10727         .name   = XATTR_NAME_NFSV4_DACL,
10728         .list   = nfs4_xattr_list_nfs4_dacl,
10729         .get    = nfs4_xattr_get_nfs4_dacl,
10730         .set    = nfs4_xattr_set_nfs4_dacl,
10731 };
10732
10733 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10734         .name   = XATTR_NAME_NFSV4_SACL,
10735         .list   = nfs4_xattr_list_nfs4_sacl,
10736         .get    = nfs4_xattr_get_nfs4_sacl,
10737         .set    = nfs4_xattr_set_nfs4_sacl,
10738 };
10739 #endif
10740
10741 #ifdef CONFIG_NFS_V4_2
10742 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10743         .prefix = XATTR_USER_PREFIX,
10744         .get    = nfs4_xattr_get_nfs4_user,
10745         .set    = nfs4_xattr_set_nfs4_user,
10746 };
10747 #endif
10748
10749 const struct xattr_handler *nfs4_xattr_handlers[] = {
10750         &nfs4_xattr_nfs4_acl_handler,
10751 #if defined(CONFIG_NFS_V4_1)
10752         &nfs4_xattr_nfs4_dacl_handler,
10753         &nfs4_xattr_nfs4_sacl_handler,
10754 #endif
10755 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10756         &nfs4_xattr_nfs4_label_handler,
10757 #endif
10758 #ifdef CONFIG_NFS_V4_2
10759         &nfs4_xattr_nfs4_user_handler,
10760 #endif
10761         NULL
10762 };