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