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                                 int openflags)
2635 {
2636         struct nfs_access_entry cache;
2637         u32 mask, flags;
2638
2639         /* access call failed or for some reason the server doesn't
2640          * support any access modes -- defer access call until later */
2641         if (opendata->o_res.access_supported == 0)
2642                 return 0;
2643
2644         mask = 0;
2645         /*
2646          * Use openflags to check for exec, because fmode won't
2647          * always have FMODE_EXEC set when file open for exec.
2648          */
2649         if (openflags & __FMODE_EXEC) {
2650                 /* ONLY check for exec rights */
2651                 if (S_ISDIR(state->inode->i_mode))
2652                         mask = NFS4_ACCESS_LOOKUP;
2653                 else
2654                         mask = NFS4_ACCESS_EXECUTE;
2655         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2656                 mask = NFS4_ACCESS_READ;
2657
2658         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2659         nfs_access_add_cache(state->inode, &cache, cred);
2660
2661         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2662         if ((mask & ~cache.mask & flags) == 0)
2663                 return 0;
2664
2665         return -EACCES;
2666 }
2667
2668 /*
2669  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2670  */
2671 static int _nfs4_proc_open(struct nfs4_opendata *data,
2672                            struct nfs_open_context *ctx)
2673 {
2674         struct inode *dir = d_inode(data->dir);
2675         struct nfs_server *server = NFS_SERVER(dir);
2676         struct nfs_openargs *o_arg = &data->o_arg;
2677         struct nfs_openres *o_res = &data->o_res;
2678         int status;
2679
2680         status = nfs4_run_open_task(data, ctx);
2681         if (!data->rpc_done)
2682                 return status;
2683         if (status != 0) {
2684                 if (status == -NFS4ERR_BADNAME &&
2685                                 !(o_arg->open_flags & O_CREAT))
2686                         return -ENOENT;
2687                 return status;
2688         }
2689
2690         nfs_fattr_map_and_free_names(server, &data->f_attr);
2691
2692         if (o_arg->open_flags & O_CREAT) {
2693                 if (o_arg->open_flags & O_EXCL)
2694                         data->file_created = true;
2695                 else if (o_res->cinfo.before != o_res->cinfo.after)
2696                         data->file_created = true;
2697                 if (data->file_created ||
2698                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2699                         nfs4_update_changeattr(dir, &o_res->cinfo,
2700                                         o_res->f_attr->time_start,
2701                                         NFS_INO_INVALID_DATA);
2702         }
2703         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2704                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2705         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2706                 status = _nfs4_proc_open_confirm(data);
2707                 if (status != 0)
2708                         return status;
2709         }
2710         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2711                 nfs4_sequence_free_slot(&o_res->seq_res);
2712                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL);
2713         }
2714         return 0;
2715 }
2716
2717 /*
2718  * OPEN_EXPIRED:
2719  *      reclaim state on the server after a network partition.
2720  *      Assumes caller holds the appropriate lock
2721  */
2722 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2723 {
2724         struct nfs4_opendata *opendata;
2725         int ret;
2726
2727         opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2728         if (IS_ERR(opendata))
2729                 return PTR_ERR(opendata);
2730         /*
2731          * We're not recovering a delegation, so ask for no delegation.
2732          * Otherwise the recovery thread could deadlock with an outstanding
2733          * delegation return.
2734          */
2735         opendata->o_arg.open_flags = O_DIRECT;
2736         ret = nfs4_open_recover(opendata, state);
2737         if (ret == -ESTALE)
2738                 d_drop(ctx->dentry);
2739         nfs4_opendata_put(opendata);
2740         return ret;
2741 }
2742
2743 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2744 {
2745         struct nfs_server *server = NFS_SERVER(state->inode);
2746         struct nfs4_exception exception = { };
2747         int err;
2748
2749         do {
2750                 err = _nfs4_open_expired(ctx, state);
2751                 trace_nfs4_open_expired(ctx, 0, err);
2752                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2753                         continue;
2754                 switch (err) {
2755                 default:
2756                         goto out;
2757                 case -NFS4ERR_GRACE:
2758                 case -NFS4ERR_DELAY:
2759                         nfs4_handle_exception(server, err, &exception);
2760                         err = 0;
2761                 }
2762         } while (exception.retry);
2763 out:
2764         return err;
2765 }
2766
2767 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2768 {
2769         struct nfs_open_context *ctx;
2770         int ret;
2771
2772         ctx = nfs4_state_find_open_context(state);
2773         if (IS_ERR(ctx))
2774                 return -EAGAIN;
2775         ret = nfs4_do_open_expired(ctx, state);
2776         put_nfs_open_context(ctx);
2777         return ret;
2778 }
2779
2780 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2781                 const nfs4_stateid *stateid)
2782 {
2783         nfs_remove_bad_delegation(state->inode, stateid);
2784         nfs_state_clear_delegation(state);
2785 }
2786
2787 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2788 {
2789         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2790                 nfs_finish_clear_delegation_stateid(state, NULL);
2791 }
2792
2793 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2794 {
2795         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2796         nfs40_clear_delegation_stateid(state);
2797         nfs_state_clear_open_state_flags(state);
2798         return nfs4_open_expired(sp, state);
2799 }
2800
2801 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2802                 nfs4_stateid *stateid,
2803                 const struct cred *cred)
2804 {
2805         return -NFS4ERR_BAD_STATEID;
2806 }
2807
2808 #if defined(CONFIG_NFS_V4_1)
2809 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2810                 nfs4_stateid *stateid,
2811                 const struct cred *cred)
2812 {
2813         int status;
2814
2815         switch (stateid->type) {
2816         default:
2817                 break;
2818         case NFS4_INVALID_STATEID_TYPE:
2819         case NFS4_SPECIAL_STATEID_TYPE:
2820                 return -NFS4ERR_BAD_STATEID;
2821         case NFS4_REVOKED_STATEID_TYPE:
2822                 goto out_free;
2823         }
2824
2825         status = nfs41_test_stateid(server, stateid, cred);
2826         switch (status) {
2827         case -NFS4ERR_EXPIRED:
2828         case -NFS4ERR_ADMIN_REVOKED:
2829         case -NFS4ERR_DELEG_REVOKED:
2830                 break;
2831         default:
2832                 return status;
2833         }
2834 out_free:
2835         /* Ack the revoked state to the server */
2836         nfs41_free_stateid(server, stateid, cred, true);
2837         return -NFS4ERR_EXPIRED;
2838 }
2839
2840 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2841 {
2842         struct nfs_server *server = NFS_SERVER(state->inode);
2843         nfs4_stateid stateid;
2844         struct nfs_delegation *delegation;
2845         const struct cred *cred = NULL;
2846         int status, ret = NFS_OK;
2847
2848         /* Get the delegation credential for use by test/free_stateid */
2849         rcu_read_lock();
2850         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2851         if (delegation == NULL) {
2852                 rcu_read_unlock();
2853                 nfs_state_clear_delegation(state);
2854                 return NFS_OK;
2855         }
2856
2857         spin_lock(&delegation->lock);
2858         nfs4_stateid_copy(&stateid, &delegation->stateid);
2859
2860         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2861                                 &delegation->flags)) {
2862                 spin_unlock(&delegation->lock);
2863                 rcu_read_unlock();
2864                 return NFS_OK;
2865         }
2866
2867         if (delegation->cred)
2868                 cred = get_cred(delegation->cred);
2869         spin_unlock(&delegation->lock);
2870         rcu_read_unlock();
2871         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2872         trace_nfs4_test_delegation_stateid(state, NULL, status);
2873         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2874                 nfs_finish_clear_delegation_stateid(state, &stateid);
2875         else
2876                 ret = status;
2877
2878         put_cred(cred);
2879         return ret;
2880 }
2881
2882 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2883 {
2884         nfs4_stateid tmp;
2885
2886         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2887             nfs4_copy_delegation_stateid(state->inode, state->state,
2888                                 &tmp, NULL) &&
2889             nfs4_stateid_match_other(&state->stateid, &tmp))
2890                 nfs_state_set_delegation(state, &tmp, state->state);
2891         else
2892                 nfs_state_clear_delegation(state);
2893 }
2894
2895 /**
2896  * nfs41_check_expired_locks - possibly free a lock stateid
2897  *
2898  * @state: NFSv4 state for an inode
2899  *
2900  * Returns NFS_OK if recovery for this stateid is now finished.
2901  * Otherwise a negative NFS4ERR value is returned.
2902  */
2903 static int nfs41_check_expired_locks(struct nfs4_state *state)
2904 {
2905         int status, ret = NFS_OK;
2906         struct nfs4_lock_state *lsp, *prev = NULL;
2907         struct nfs_server *server = NFS_SERVER(state->inode);
2908
2909         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2910                 goto out;
2911
2912         spin_lock(&state->state_lock);
2913         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2914                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2915                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2916
2917                         refcount_inc(&lsp->ls_count);
2918                         spin_unlock(&state->state_lock);
2919
2920                         nfs4_put_lock_state(prev);
2921                         prev = lsp;
2922
2923                         status = nfs41_test_and_free_expired_stateid(server,
2924                                         &lsp->ls_stateid,
2925                                         cred);
2926                         trace_nfs4_test_lock_stateid(state, lsp, status);
2927                         if (status == -NFS4ERR_EXPIRED ||
2928                             status == -NFS4ERR_BAD_STATEID) {
2929                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2930                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2931                                 if (!recover_lost_locks)
2932                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2933                         } else if (status != NFS_OK) {
2934                                 ret = status;
2935                                 nfs4_put_lock_state(prev);
2936                                 goto out;
2937                         }
2938                         spin_lock(&state->state_lock);
2939                 }
2940         }
2941         spin_unlock(&state->state_lock);
2942         nfs4_put_lock_state(prev);
2943 out:
2944         return ret;
2945 }
2946
2947 /**
2948  * nfs41_check_open_stateid - possibly free an open stateid
2949  *
2950  * @state: NFSv4 state for an inode
2951  *
2952  * Returns NFS_OK if recovery for this stateid is now finished.
2953  * Otherwise a negative NFS4ERR value is returned.
2954  */
2955 static int nfs41_check_open_stateid(struct nfs4_state *state)
2956 {
2957         struct nfs_server *server = NFS_SERVER(state->inode);
2958         nfs4_stateid *stateid = &state->open_stateid;
2959         const struct cred *cred = state->owner->so_cred;
2960         int status;
2961
2962         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2963                 return -NFS4ERR_BAD_STATEID;
2964         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2965         trace_nfs4_test_open_stateid(state, NULL, status);
2966         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2967                 nfs_state_clear_open_state_flags(state);
2968                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2969                 return status;
2970         }
2971         if (nfs_open_stateid_recover_openmode(state))
2972                 return -NFS4ERR_OPENMODE;
2973         return NFS_OK;
2974 }
2975
2976 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2977 {
2978         int status;
2979
2980         status = nfs41_check_delegation_stateid(state);
2981         if (status != NFS_OK)
2982                 return status;
2983         nfs41_delegation_recover_stateid(state);
2984
2985         status = nfs41_check_expired_locks(state);
2986         if (status != NFS_OK)
2987                 return status;
2988         status = nfs41_check_open_stateid(state);
2989         if (status != NFS_OK)
2990                 status = nfs4_open_expired(sp, state);
2991         return status;
2992 }
2993 #endif
2994
2995 /*
2996  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2997  * fields corresponding to attributes that were used to store the verifier.
2998  * Make sure we clobber those fields in the later setattr call
2999  */
3000 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3001                                 struct iattr *sattr, struct nfs4_label **label)
3002 {
3003         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3004         __u32 attrset[3];
3005         unsigned ret;
3006         unsigned i;
3007
3008         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3009                 attrset[i] = opendata->o_res.attrset[i];
3010                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3011                         attrset[i] &= ~bitmask[i];
3012         }
3013
3014         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3015                 sattr->ia_valid : 0;
3016
3017         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3018                 if (sattr->ia_valid & ATTR_ATIME_SET)
3019                         ret |= ATTR_ATIME_SET;
3020                 else
3021                         ret |= ATTR_ATIME;
3022         }
3023
3024         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3025                 if (sattr->ia_valid & ATTR_MTIME_SET)
3026                         ret |= ATTR_MTIME_SET;
3027                 else
3028                         ret |= ATTR_MTIME;
3029         }
3030
3031         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3032                 *label = NULL;
3033         return ret;
3034 }
3035
3036 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3037                 int flags, struct nfs_open_context *ctx)
3038 {
3039         struct nfs4_state_owner *sp = opendata->owner;
3040         struct nfs_server *server = sp->so_server;
3041         struct dentry *dentry;
3042         struct nfs4_state *state;
3043         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3044         struct inode *dir = d_inode(opendata->dir);
3045         unsigned long dir_verifier;
3046         unsigned int seq;
3047         int ret;
3048
3049         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3050         dir_verifier = nfs_save_change_attribute(dir);
3051
3052         ret = _nfs4_proc_open(opendata, ctx);
3053         if (ret != 0)
3054                 goto out;
3055
3056         state = _nfs4_opendata_to_nfs4_state(opendata);
3057         ret = PTR_ERR(state);
3058         if (IS_ERR(state))
3059                 goto out;
3060         ctx->state = state;
3061         if (server->caps & NFS_CAP_POSIX_LOCK)
3062                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3063         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3064                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3065         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3066                 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3067
3068         dentry = opendata->dentry;
3069         if (d_really_is_negative(dentry)) {
3070                 struct dentry *alias;
3071                 d_drop(dentry);
3072                 alias = d_exact_alias(dentry, state->inode);
3073                 if (!alias)
3074                         alias = d_splice_alias(igrab(state->inode), dentry);
3075                 /* d_splice_alias() can't fail here - it's a non-directory */
3076                 if (alias) {
3077                         dput(ctx->dentry);
3078                         ctx->dentry = dentry = alias;
3079                 }
3080         }
3081
3082         switch(opendata->o_arg.claim) {
3083         default:
3084                 break;
3085         case NFS4_OPEN_CLAIM_NULL:
3086         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3087         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3088                 if (!opendata->rpc_done)
3089                         break;
3090                 if (opendata->o_res.delegation_type != 0)
3091                         dir_verifier = nfs_save_change_attribute(dir);
3092                 nfs_set_verifier(dentry, dir_verifier);
3093         }
3094
3095         /* Parse layoutget results before we check for access */
3096         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3097
3098         ret = nfs4_opendata_access(sp->so_cred, opendata, state,
3099                         acc_mode, flags);
3100         if (ret != 0)
3101                 goto out;
3102
3103         if (d_inode(dentry) == state->inode) {
3104                 nfs_inode_attach_open_context(ctx);
3105                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3106                         nfs4_schedule_stateid_recovery(server, state);
3107         }
3108
3109 out:
3110         if (!opendata->cancelled) {
3111                 if (opendata->lgp) {
3112                         nfs4_lgopen_release(opendata->lgp);
3113                         opendata->lgp = NULL;
3114                 }
3115                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3116         }
3117         return ret;
3118 }
3119
3120 /*
3121  * Returns a referenced nfs4_state
3122  */
3123 static int _nfs4_do_open(struct inode *dir,
3124                         struct nfs_open_context *ctx,
3125                         int flags,
3126                         const struct nfs4_open_createattrs *c,
3127                         int *opened)
3128 {
3129         struct nfs4_state_owner  *sp;
3130         struct nfs4_state     *state = NULL;
3131         struct nfs_server       *server = NFS_SERVER(dir);
3132         struct nfs4_opendata *opendata;
3133         struct dentry *dentry = ctx->dentry;
3134         const struct cred *cred = ctx->cred;
3135         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3136         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3137         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3138         struct iattr *sattr = c->sattr;
3139         struct nfs4_label *label = c->label;
3140         int status;
3141
3142         /* Protect against reboot recovery conflicts */
3143         status = -ENOMEM;
3144         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3145         if (sp == NULL) {
3146                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3147                 goto out_err;
3148         }
3149         status = nfs4_client_recover_expired_lease(server->nfs_client);
3150         if (status != 0)
3151                 goto err_put_state_owner;
3152         if (d_really_is_positive(dentry))
3153                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3154         status = -ENOMEM;
3155         if (d_really_is_positive(dentry))
3156                 claim = NFS4_OPEN_CLAIM_FH;
3157         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3158                         c, claim, GFP_KERNEL);
3159         if (opendata == NULL)
3160                 goto err_put_state_owner;
3161
3162         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3163                 if (!opendata->f_attr.mdsthreshold) {
3164                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3165                         if (!opendata->f_attr.mdsthreshold)
3166                                 goto err_opendata_put;
3167                 }
3168                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3169         }
3170         if (d_really_is_positive(dentry))
3171                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3172
3173         status = _nfs4_open_and_get_state(opendata, flags, ctx);
3174         if (status != 0)
3175                 goto err_opendata_put;
3176         state = ctx->state;
3177
3178         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3179             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3180                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3181                 /*
3182                  * send create attributes which was not set by open
3183                  * with an extra setattr.
3184                  */
3185                 if (attrs || label) {
3186                         unsigned ia_old = sattr->ia_valid;
3187
3188                         sattr->ia_valid = attrs;
3189                         nfs_fattr_init(opendata->o_res.f_attr);
3190                         status = nfs4_do_setattr(state->inode, cred,
3191                                         opendata->o_res.f_attr, sattr,
3192                                         ctx, label);
3193                         if (status == 0) {
3194                                 nfs_setattr_update_inode(state->inode, sattr,
3195                                                 opendata->o_res.f_attr);
3196                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3197                         }
3198                         sattr->ia_valid = ia_old;
3199                 }
3200         }
3201         if (opened && opendata->file_created)
3202                 *opened = 1;
3203
3204         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3205                 *ctx_th = opendata->f_attr.mdsthreshold;
3206                 opendata->f_attr.mdsthreshold = NULL;
3207         }
3208
3209         nfs4_opendata_put(opendata);
3210         nfs4_put_state_owner(sp);
3211         return 0;
3212 err_opendata_put:
3213         nfs4_opendata_put(opendata);
3214 err_put_state_owner:
3215         nfs4_put_state_owner(sp);
3216 out_err:
3217         return status;
3218 }
3219
3220
3221 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3222                                         struct nfs_open_context *ctx,
3223                                         int flags,
3224                                         struct iattr *sattr,
3225                                         struct nfs4_label *label,
3226                                         int *opened)
3227 {
3228         struct nfs_server *server = NFS_SERVER(dir);
3229         struct nfs4_exception exception = {
3230                 .interruptible = true,
3231         };
3232         struct nfs4_state *res;
3233         struct nfs4_open_createattrs c = {
3234                 .label = label,
3235                 .sattr = sattr,
3236                 .verf = {
3237                         [0] = (__u32)jiffies,
3238                         [1] = (__u32)current->pid,
3239                 },
3240         };
3241         int status;
3242
3243         do {
3244                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3245                 res = ctx->state;
3246                 trace_nfs4_open_file(ctx, flags, status);
3247                 if (status == 0)
3248                         break;
3249                 /* NOTE: BAD_SEQID means the server and client disagree about the
3250                  * book-keeping w.r.t. state-changing operations
3251                  * (OPEN/CLOSE/LOCK/LOCKU...)
3252                  * It is actually a sign of a bug on the client or on the server.
3253                  *
3254                  * If we receive a BAD_SEQID error in the particular case of
3255                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3256                  * have unhashed the old state_owner for us, and that we can
3257                  * therefore safely retry using a new one. We should still warn
3258                  * the user though...
3259                  */
3260                 if (status == -NFS4ERR_BAD_SEQID) {
3261                         pr_warn_ratelimited("NFS: v4 server %s "
3262                                         " returned a bad sequence-id error!\n",
3263                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3264                         exception.retry = 1;
3265                         continue;
3266                 }
3267                 /*
3268                  * BAD_STATEID on OPEN means that the server cancelled our
3269                  * state before it received the OPEN_CONFIRM.
3270                  * Recover by retrying the request as per the discussion
3271                  * on Page 181 of RFC3530.
3272                  */
3273                 if (status == -NFS4ERR_BAD_STATEID) {
3274                         exception.retry = 1;
3275                         continue;
3276                 }
3277                 if (status == -NFS4ERR_EXPIRED) {
3278                         nfs4_schedule_lease_recovery(server->nfs_client);
3279                         exception.retry = 1;
3280                         continue;
3281                 }
3282                 if (status == -EAGAIN) {
3283                         /* We must have found a delegation */
3284                         exception.retry = 1;
3285                         continue;
3286                 }
3287                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3288                         continue;
3289                 res = ERR_PTR(nfs4_handle_exception(server,
3290                                         status, &exception));
3291         } while (exception.retry);
3292         return res;
3293 }
3294
3295 static int _nfs4_do_setattr(struct inode *inode,
3296                             struct nfs_setattrargs *arg,
3297                             struct nfs_setattrres *res,
3298                             const struct cred *cred,
3299                             struct nfs_open_context *ctx)
3300 {
3301         struct nfs_server *server = NFS_SERVER(inode);
3302         struct rpc_message msg = {
3303                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3304                 .rpc_argp       = arg,
3305                 .rpc_resp       = res,
3306                 .rpc_cred       = cred,
3307         };
3308         const struct cred *delegation_cred = NULL;
3309         unsigned long timestamp = jiffies;
3310         bool truncate;
3311         int status;
3312
3313         nfs_fattr_init(res->fattr);
3314
3315         /* Servers should only apply open mode checks for file size changes */
3316         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3317         if (!truncate) {
3318                 nfs4_inode_make_writeable(inode);
3319                 goto zero_stateid;
3320         }
3321
3322         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3323                 /* Use that stateid */
3324         } else if (ctx != NULL && ctx->state) {
3325                 struct nfs_lock_context *l_ctx;
3326                 if (!nfs4_valid_open_stateid(ctx->state))
3327                         return -EBADF;
3328                 l_ctx = nfs_get_lock_context(ctx);
3329                 if (IS_ERR(l_ctx))
3330                         return PTR_ERR(l_ctx);
3331                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3332                                                 &arg->stateid, &delegation_cred);
3333                 nfs_put_lock_context(l_ctx);
3334                 if (status == -EIO)
3335                         return -EBADF;
3336                 else if (status == -EAGAIN)
3337                         goto zero_stateid;
3338         } else {
3339 zero_stateid:
3340                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3341         }
3342         if (delegation_cred)
3343                 msg.rpc_cred = delegation_cred;
3344
3345         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3346
3347         put_cred(delegation_cred);
3348         if (status == 0 && ctx != NULL)
3349                 renew_lease(server, timestamp);
3350         trace_nfs4_setattr(inode, &arg->stateid, status);
3351         return status;
3352 }
3353
3354 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3355                            struct nfs_fattr *fattr, struct iattr *sattr,
3356                            struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3357 {
3358         struct nfs_server *server = NFS_SERVER(inode);
3359         __u32 bitmask[NFS4_BITMASK_SZ];
3360         struct nfs4_state *state = ctx ? ctx->state : NULL;
3361         struct nfs_setattrargs  arg = {
3362                 .fh             = NFS_FH(inode),
3363                 .iap            = sattr,
3364                 .server         = server,
3365                 .bitmask = bitmask,
3366                 .label          = ilabel,
3367         };
3368         struct nfs_setattrres  res = {
3369                 .fattr          = fattr,
3370                 .server         = server,
3371         };
3372         struct nfs4_exception exception = {
3373                 .state = state,
3374                 .inode = inode,
3375                 .stateid = &arg.stateid,
3376         };
3377         unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3378         int err;
3379
3380         if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3381                 adjust_flags |= NFS_INO_INVALID_MODE;
3382         if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3383                 adjust_flags |= NFS_INO_INVALID_OTHER;
3384
3385         do {
3386                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3387                                         inode, adjust_flags);
3388
3389                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3390                 switch (err) {
3391                 case -NFS4ERR_OPENMODE:
3392                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3393                                 pr_warn_once("NFSv4: server %s is incorrectly "
3394                                                 "applying open mode checks to "
3395                                                 "a SETATTR that is not "
3396                                                 "changing file size.\n",
3397                                                 server->nfs_client->cl_hostname);
3398                         }
3399                         if (state && !(state->state & FMODE_WRITE)) {
3400                                 err = -EBADF;
3401                                 if (sattr->ia_valid & ATTR_OPEN)
3402                                         err = -EACCES;
3403                                 goto out;
3404                         }
3405                 }
3406                 err = nfs4_handle_exception(server, err, &exception);
3407         } while (exception.retry);
3408 out:
3409         return err;
3410 }
3411
3412 static bool
3413 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3414 {
3415         if (inode == NULL || !nfs_have_layout(inode))
3416                 return false;
3417
3418         return pnfs_wait_on_layoutreturn(inode, task);
3419 }
3420
3421 /*
3422  * Update the seqid of an open stateid
3423  */
3424 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3425                 struct nfs4_state *state)
3426 {
3427         __be32 seqid_open;
3428         u32 dst_seqid;
3429         int seq;
3430
3431         for (;;) {
3432                 if (!nfs4_valid_open_stateid(state))
3433                         break;
3434                 seq = read_seqbegin(&state->seqlock);
3435                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3436                         nfs4_stateid_copy(dst, &state->open_stateid);
3437                         if (read_seqretry(&state->seqlock, seq))
3438                                 continue;
3439                         break;
3440                 }
3441                 seqid_open = state->open_stateid.seqid;
3442                 if (read_seqretry(&state->seqlock, seq))
3443                         continue;
3444
3445                 dst_seqid = be32_to_cpu(dst->seqid);
3446                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3447                         dst->seqid = seqid_open;
3448                 break;
3449         }
3450 }
3451
3452 /*
3453  * Update the seqid of an open stateid after receiving
3454  * NFS4ERR_OLD_STATEID
3455  */
3456 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3457                 struct nfs4_state *state)
3458 {
3459         __be32 seqid_open;
3460         u32 dst_seqid;
3461         bool ret;
3462         int seq, status = -EAGAIN;
3463         DEFINE_WAIT(wait);
3464
3465         for (;;) {
3466                 ret = false;
3467                 if (!nfs4_valid_open_stateid(state))
3468                         break;
3469                 seq = read_seqbegin(&state->seqlock);
3470                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3471                         if (read_seqretry(&state->seqlock, seq))
3472                                 continue;
3473                         break;
3474                 }
3475
3476                 write_seqlock(&state->seqlock);
3477                 seqid_open = state->open_stateid.seqid;
3478
3479                 dst_seqid = be32_to_cpu(dst->seqid);
3480
3481                 /* Did another OPEN bump the state's seqid?  try again: */
3482                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3483                         dst->seqid = seqid_open;
3484                         write_sequnlock(&state->seqlock);
3485                         ret = true;
3486                         break;
3487                 }
3488
3489                 /* server says we're behind but we haven't seen the update yet */
3490                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3491                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3492                 write_sequnlock(&state->seqlock);
3493                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3494
3495                 if (fatal_signal_pending(current))
3496                         status = -EINTR;
3497                 else
3498                         if (schedule_timeout(5*HZ) != 0)
3499                                 status = 0;
3500
3501                 finish_wait(&state->waitq, &wait);
3502
3503                 if (!status)
3504                         continue;
3505                 if (status == -EINTR)
3506                         break;
3507
3508                 /* we slept the whole 5 seconds, we must have lost a seqid */
3509                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3510                 ret = true;
3511                 break;
3512         }
3513
3514         return ret;
3515 }
3516
3517 struct nfs4_closedata {
3518         struct inode *inode;
3519         struct nfs4_state *state;
3520         struct nfs_closeargs arg;
3521         struct nfs_closeres res;
3522         struct {
3523                 struct nfs4_layoutreturn_args arg;
3524                 struct nfs4_layoutreturn_res res;
3525                 struct nfs4_xdr_opaque_data ld_private;
3526                 u32 roc_barrier;
3527                 bool roc;
3528         } lr;
3529         struct nfs_fattr fattr;
3530         unsigned long timestamp;
3531 };
3532
3533 static void nfs4_free_closedata(void *data)
3534 {
3535         struct nfs4_closedata *calldata = data;
3536         struct nfs4_state_owner *sp = calldata->state->owner;
3537         struct super_block *sb = calldata->state->inode->i_sb;
3538
3539         if (calldata->lr.roc)
3540                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3541                                 calldata->res.lr_ret);
3542         nfs4_put_open_state(calldata->state);
3543         nfs_free_seqid(calldata->arg.seqid);
3544         nfs4_put_state_owner(sp);
3545         nfs_sb_deactive(sb);
3546         kfree(calldata);
3547 }
3548
3549 static void nfs4_close_done(struct rpc_task *task, void *data)
3550 {
3551         struct nfs4_closedata *calldata = data;
3552         struct nfs4_state *state = calldata->state;
3553         struct nfs_server *server = NFS_SERVER(calldata->inode);
3554         nfs4_stateid *res_stateid = NULL;
3555         struct nfs4_exception exception = {
3556                 .state = state,
3557                 .inode = calldata->inode,
3558                 .stateid = &calldata->arg.stateid,
3559         };
3560
3561         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3562                 return;
3563         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3564
3565         /* Handle Layoutreturn errors */
3566         if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3567                           &calldata->res.lr_ret) == -EAGAIN)
3568                 goto out_restart;
3569
3570         /* hmm. we are done with the inode, and in the process of freeing
3571          * the state_owner. we keep this around to process errors
3572          */
3573         switch (task->tk_status) {
3574                 case 0:
3575                         res_stateid = &calldata->res.stateid;
3576                         renew_lease(server, calldata->timestamp);
3577                         break;
3578                 case -NFS4ERR_ACCESS:
3579                         if (calldata->arg.bitmask != NULL) {
3580                                 calldata->arg.bitmask = NULL;
3581                                 calldata->res.fattr = NULL;
3582                                 goto out_restart;
3583
3584                         }
3585                         break;
3586                 case -NFS4ERR_OLD_STATEID:
3587                         /* Did we race with OPEN? */
3588                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3589                                                 state))
3590                                 goto out_restart;
3591                         goto out_release;
3592                 case -NFS4ERR_ADMIN_REVOKED:
3593                 case -NFS4ERR_STALE_STATEID:
3594                 case -NFS4ERR_EXPIRED:
3595                         nfs4_free_revoked_stateid(server,
3596                                         &calldata->arg.stateid,
3597                                         task->tk_msg.rpc_cred);
3598                         fallthrough;
3599                 case -NFS4ERR_BAD_STATEID:
3600                         if (calldata->arg.fmode == 0)
3601                                 break;
3602                         fallthrough;
3603                 default:
3604                         task->tk_status = nfs4_async_handle_exception(task,
3605                                         server, task->tk_status, &exception);
3606                         if (exception.retry)
3607                                 goto out_restart;
3608         }
3609         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3610                         res_stateid, calldata->arg.fmode);
3611 out_release:
3612         task->tk_status = 0;
3613         nfs_release_seqid(calldata->arg.seqid);
3614         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3615         dprintk("%s: ret = %d\n", __func__, task->tk_status);
3616         return;
3617 out_restart:
3618         task->tk_status = 0;
3619         rpc_restart_call_prepare(task);
3620         goto out_release;
3621 }
3622
3623 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3624 {
3625         struct nfs4_closedata *calldata = data;
3626         struct nfs4_state *state = calldata->state;
3627         struct inode *inode = calldata->inode;
3628         struct nfs_server *server = NFS_SERVER(inode);
3629         struct pnfs_layout_hdr *lo;
3630         bool is_rdonly, is_wronly, is_rdwr;
3631         int call_close = 0;
3632
3633         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3634                 goto out_wait;
3635
3636         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3637         spin_lock(&state->owner->so_lock);
3638         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3639         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3640         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3641         /* Calculate the change in open mode */
3642         calldata->arg.fmode = 0;
3643         if (state->n_rdwr == 0) {
3644                 if (state->n_rdonly == 0)
3645                         call_close |= is_rdonly;
3646                 else if (is_rdonly)
3647                         calldata->arg.fmode |= FMODE_READ;
3648                 if (state->n_wronly == 0)
3649                         call_close |= is_wronly;
3650                 else if (is_wronly)
3651                         calldata->arg.fmode |= FMODE_WRITE;
3652                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3653                         call_close |= is_rdwr;
3654         } else if (is_rdwr)
3655                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3656
3657         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3658         if (!nfs4_valid_open_stateid(state))
3659                 call_close = 0;
3660         spin_unlock(&state->owner->so_lock);
3661
3662         if (!call_close) {
3663                 /* Note: exit _without_ calling nfs4_close_done */
3664                 goto out_no_action;
3665         }
3666
3667         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3668                 nfs_release_seqid(calldata->arg.seqid);
3669                 goto out_wait;
3670         }
3671
3672         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3673         if (lo && !pnfs_layout_is_valid(lo)) {
3674                 calldata->arg.lr_args = NULL;
3675                 calldata->res.lr_res = NULL;
3676         }
3677
3678         if (calldata->arg.fmode == 0)
3679                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3680
3681         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3682                 /* Close-to-open cache consistency revalidation */
3683                 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3684                         nfs4_bitmask_set(calldata->arg.bitmask_store,
3685                                          server->cache_consistency_bitmask,
3686                                          inode, 0);
3687                         calldata->arg.bitmask = calldata->arg.bitmask_store;
3688                 } else
3689                         calldata->arg.bitmask = NULL;
3690         }
3691
3692         calldata->arg.share_access =
3693                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3694                                 calldata->arg.fmode, 0);
3695
3696         if (calldata->res.fattr == NULL)
3697                 calldata->arg.bitmask = NULL;
3698         else if (calldata->arg.bitmask == NULL)
3699                 calldata->res.fattr = NULL;
3700         calldata->timestamp = jiffies;
3701         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3702                                 &calldata->arg.seq_args,
3703                                 &calldata->res.seq_res,
3704                                 task) != 0)
3705                 nfs_release_seqid(calldata->arg.seqid);
3706         return;
3707 out_no_action:
3708         task->tk_action = NULL;
3709 out_wait:
3710         nfs4_sequence_done(task, &calldata->res.seq_res);
3711 }
3712
3713 static const struct rpc_call_ops nfs4_close_ops = {
3714         .rpc_call_prepare = nfs4_close_prepare,
3715         .rpc_call_done = nfs4_close_done,
3716         .rpc_release = nfs4_free_closedata,
3717 };
3718
3719 /*
3720  * It is possible for data to be read/written from a mem-mapped file
3721  * after the sys_close call (which hits the vfs layer as a flush).
3722  * This means that we can't safely call nfsv4 close on a file until
3723  * the inode is cleared. This in turn means that we are not good
3724  * NFSv4 citizens - we do not indicate to the server to update the file's
3725  * share state even when we are done with one of the three share
3726  * stateid's in the inode.
3727  *
3728  * NOTE: Caller must be holding the sp->so_owner semaphore!
3729  */
3730 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3731 {
3732         struct nfs_server *server = NFS_SERVER(state->inode);
3733         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3734         struct nfs4_closedata *calldata;
3735         struct nfs4_state_owner *sp = state->owner;
3736         struct rpc_task *task;
3737         struct rpc_message msg = {
3738                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3739                 .rpc_cred = state->owner->so_cred,
3740         };
3741         struct rpc_task_setup task_setup_data = {
3742                 .rpc_client = server->client,
3743                 .rpc_message = &msg,
3744                 .callback_ops = &nfs4_close_ops,
3745                 .workqueue = nfsiod_workqueue,
3746                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3747         };
3748         int status = -ENOMEM;
3749
3750         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3751                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3752
3753         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3754                 &task_setup_data.rpc_client, &msg);
3755
3756         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3757         if (calldata == NULL)
3758                 goto out;
3759         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3760         calldata->inode = state->inode;
3761         calldata->state = state;
3762         calldata->arg.fh = NFS_FH(state->inode);
3763         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3764                 goto out_free_calldata;
3765         /* Serialization for the sequence id */
3766         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3767         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3768         if (IS_ERR(calldata->arg.seqid))
3769                 goto out_free_calldata;
3770         nfs_fattr_init(&calldata->fattr);
3771         calldata->arg.fmode = 0;
3772         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3773         calldata->res.fattr = &calldata->fattr;
3774         calldata->res.seqid = calldata->arg.seqid;
3775         calldata->res.server = server;
3776         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3777         calldata->lr.roc = pnfs_roc(state->inode,
3778                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3779         if (calldata->lr.roc) {
3780                 calldata->arg.lr_args = &calldata->lr.arg;
3781                 calldata->res.lr_res = &calldata->lr.res;
3782         }
3783         nfs_sb_active(calldata->inode->i_sb);
3784
3785         msg.rpc_argp = &calldata->arg;
3786         msg.rpc_resp = &calldata->res;
3787         task_setup_data.callback_data = calldata;
3788         task = rpc_run_task(&task_setup_data);
3789         if (IS_ERR(task))
3790                 return PTR_ERR(task);
3791         status = 0;
3792         if (wait)
3793                 status = rpc_wait_for_completion_task(task);
3794         rpc_put_task(task);
3795         return status;
3796 out_free_calldata:
3797         kfree(calldata);
3798 out:
3799         nfs4_put_open_state(state);
3800         nfs4_put_state_owner(sp);
3801         return status;
3802 }
3803
3804 static struct inode *
3805 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3806                 int open_flags, struct iattr *attr, int *opened)
3807 {
3808         struct nfs4_state *state;
3809         struct nfs4_label l, *label;
3810
3811         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3812
3813         /* Protect against concurrent sillydeletes */
3814         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3815
3816         nfs4_label_release_security(label);
3817
3818         if (IS_ERR(state))
3819                 return ERR_CAST(state);
3820         return state->inode;
3821 }
3822
3823 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3824 {
3825         if (ctx->state == NULL)
3826                 return;
3827         if (is_sync)
3828                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3829         else
3830                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3831 }
3832
3833 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3834 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3835 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3836
3837 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3838 {
3839         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3840         struct nfs4_server_caps_arg args = {
3841                 .fhandle = fhandle,
3842                 .bitmask = bitmask,
3843         };
3844         struct nfs4_server_caps_res res = {};
3845         struct rpc_message msg = {
3846                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3847                 .rpc_argp = &args,
3848                 .rpc_resp = &res,
3849         };
3850         int status;
3851         int i;
3852
3853         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3854                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3855                      FATTR4_WORD0_LINK_SUPPORT |
3856                      FATTR4_WORD0_SYMLINK_SUPPORT |
3857                      FATTR4_WORD0_ACLSUPPORT |
3858                      FATTR4_WORD0_CASE_INSENSITIVE |
3859                      FATTR4_WORD0_CASE_PRESERVING;
3860         if (minorversion)
3861                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3862
3863         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3864         if (status == 0) {
3865                 /* Sanity check the server answers */
3866                 switch (minorversion) {
3867                 case 0:
3868                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3869                         res.attr_bitmask[2] = 0;
3870                         break;
3871                 case 1:
3872                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3873                         break;
3874                 case 2:
3875                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3876                 }
3877                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3878                 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3879                                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3880                 server->fattr_valid = NFS_ATTR_FATTR_V4;
3881                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3882                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3883                         server->caps |= NFS_CAP_ACLS;
3884                 if (res.has_links != 0)
3885                         server->caps |= NFS_CAP_HARDLINKS;
3886                 if (res.has_symlinks != 0)
3887                         server->caps |= NFS_CAP_SYMLINKS;
3888                 if (res.case_insensitive)
3889                         server->caps |= NFS_CAP_CASE_INSENSITIVE;
3890                 if (res.case_preserving)
3891                         server->caps |= NFS_CAP_CASE_PRESERVING;
3892 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3893                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3894                         server->caps |= NFS_CAP_SECURITY_LABEL;
3895 #endif
3896                 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3897                         server->caps |= NFS_CAP_FS_LOCATIONS;
3898                 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3899                         server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3900                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3901                         server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3902                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3903                         server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3904                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3905                         server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3906                                 NFS_ATTR_FATTR_OWNER_NAME);
3907                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3908                         server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3909                                 NFS_ATTR_FATTR_GROUP_NAME);
3910                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3911                         server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3912                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3913                         server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3914                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3915                         server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3916                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3917                         server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3918                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3919                                 sizeof(server->attr_bitmask));
3920                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3921
3922                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3923                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3924                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3925                 server->cache_consistency_bitmask[2] = 0;
3926
3927                 /* Avoid a regression due to buggy server */
3928                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3929                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3930                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3931                         sizeof(server->exclcreat_bitmask));
3932
3933                 server->acl_bitmask = res.acl_bitmask;
3934                 server->fh_expire_type = res.fh_expire_type;
3935         }
3936
3937         return status;
3938 }
3939
3940 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3941 {
3942         struct nfs4_exception exception = {
3943                 .interruptible = true,
3944         };
3945         int err;
3946
3947         nfs4_server_set_init_caps(server);
3948         do {
3949                 err = nfs4_handle_exception(server,
3950                                 _nfs4_server_capabilities(server, fhandle),
3951                                 &exception);
3952         } while (exception.retry);
3953         return err;
3954 }
3955
3956 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3957                                           struct nfs_client *clp,
3958                                           struct nfs_server *server)
3959 {
3960         int i;
3961
3962         for (i = 0; i < location->nservers; i++) {
3963                 struct nfs4_string *srv_loc = &location->servers[i];
3964                 struct sockaddr_storage addr;
3965                 size_t addrlen;
3966                 struct xprt_create xprt_args = {
3967                         .ident = 0,
3968                         .net = clp->cl_net,
3969                 };
3970                 struct nfs4_add_xprt_data xprtdata = {
3971                         .clp = clp,
3972                 };
3973                 struct rpc_add_xprt_test rpcdata = {
3974                         .add_xprt_test = clp->cl_mvops->session_trunk,
3975                         .data = &xprtdata,
3976                 };
3977                 char *servername = NULL;
3978
3979                 if (!srv_loc->len)
3980                         continue;
3981
3982                 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
3983                                                 &addr, sizeof(addr),
3984                                                 clp->cl_net, server->port);
3985                 if (!addrlen)
3986                         return;
3987                 xprt_args.dstaddr = (struct sockaddr *)&addr;
3988                 xprt_args.addrlen = addrlen;
3989                 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
3990                 if (!servername)
3991                         return;
3992                 memcpy(servername, srv_loc->data, srv_loc->len);
3993                 servername[srv_loc->len] = '\0';
3994                 xprt_args.servername = servername;
3995
3996                 xprtdata.cred = nfs4_get_clid_cred(clp);
3997                 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
3998                                   rpc_clnt_setup_test_and_add_xprt,
3999                                   &rpcdata);
4000                 if (xprtdata.cred)
4001                         put_cred(xprtdata.cred);
4002                 kfree(servername);
4003         }
4004 }
4005
4006 static int _nfs4_discover_trunking(struct nfs_server *server,
4007                                    struct nfs_fh *fhandle)
4008 {
4009         struct nfs4_fs_locations *locations = NULL;
4010         struct page *page;
4011         const struct cred *cred;
4012         struct nfs_client *clp = server->nfs_client;
4013         const struct nfs4_state_maintenance_ops *ops =
4014                 clp->cl_mvops->state_renewal_ops;
4015         int status = -ENOMEM, i;
4016
4017         cred = ops->get_state_renewal_cred(clp);
4018         if (cred == NULL) {
4019                 cred = nfs4_get_clid_cred(clp);
4020                 if (cred == NULL)
4021                         return -ENOKEY;
4022         }
4023
4024         page = alloc_page(GFP_KERNEL);
4025         if (!page)
4026                 goto out_put_cred;
4027         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4028         if (!locations)
4029                 goto out_free;
4030         locations->fattr = nfs_alloc_fattr();
4031         if (!locations->fattr)
4032                 goto out_free_2;
4033
4034         status = nfs4_proc_get_locations(server, fhandle, locations, page,
4035                                          cred);
4036         if (status)
4037                 goto out_free_3;
4038
4039         for (i = 0; i < locations->nlocations; i++)
4040                 test_fs_location_for_trunking(&locations->locations[i], clp,
4041                                               server);
4042 out_free_3:
4043         kfree(locations->fattr);
4044 out_free_2:
4045         kfree(locations);
4046 out_free:
4047         __free_page(page);
4048 out_put_cred:
4049         put_cred(cred);
4050         return status;
4051 }
4052
4053 static int nfs4_discover_trunking(struct nfs_server *server,
4054                                   struct nfs_fh *fhandle)
4055 {
4056         struct nfs4_exception exception = {
4057                 .interruptible = true,
4058         };
4059         struct nfs_client *clp = server->nfs_client;
4060         int err = 0;
4061
4062         if (!nfs4_has_session(clp))
4063                 goto out;
4064         do {
4065                 err = nfs4_handle_exception(server,
4066                                 _nfs4_discover_trunking(server, fhandle),
4067                                 &exception);
4068         } while (exception.retry);
4069 out:
4070         return err;
4071 }
4072
4073 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4074                 struct nfs_fsinfo *info)
4075 {
4076         u32 bitmask[3];
4077         struct nfs4_lookup_root_arg args = {
4078                 .bitmask = bitmask,
4079         };
4080         struct nfs4_lookup_res res = {
4081                 .server = server,
4082                 .fattr = info->fattr,
4083                 .fh = fhandle,
4084         };
4085         struct rpc_message msg = {
4086                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4087                 .rpc_argp = &args,
4088                 .rpc_resp = &res,
4089         };
4090
4091         bitmask[0] = nfs4_fattr_bitmap[0];
4092         bitmask[1] = nfs4_fattr_bitmap[1];
4093         /*
4094          * Process the label in the upcoming getfattr
4095          */
4096         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4097
4098         nfs_fattr_init(info->fattr);
4099         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4100 }
4101
4102 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4103                 struct nfs_fsinfo *info)
4104 {
4105         struct nfs4_exception exception = {
4106                 .interruptible = true,
4107         };
4108         int err;
4109         do {
4110                 err = _nfs4_lookup_root(server, fhandle, info);
4111                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4112                 switch (err) {
4113                 case 0:
4114                 case -NFS4ERR_WRONGSEC:
4115                         goto out;
4116                 default:
4117                         err = nfs4_handle_exception(server, err, &exception);
4118                 }
4119         } while (exception.retry);
4120 out:
4121         return err;
4122 }
4123
4124 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4125                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4126 {
4127         struct rpc_auth_create_args auth_args = {
4128                 .pseudoflavor = flavor,
4129         };
4130         struct rpc_auth *auth;
4131
4132         auth = rpcauth_create(&auth_args, server->client);
4133         if (IS_ERR(auth))
4134                 return -EACCES;
4135         return nfs4_lookup_root(server, fhandle, info);
4136 }
4137
4138 /*
4139  * Retry pseudoroot lookup with various security flavors.  We do this when:
4140  *
4141  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4142  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4143  *
4144  * Returns zero on success, or a negative NFS4ERR value, or a
4145  * negative errno value.
4146  */
4147 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4148                               struct nfs_fsinfo *info)
4149 {
4150         /* Per 3530bis 15.33.5 */
4151         static const rpc_authflavor_t flav_array[] = {
4152                 RPC_AUTH_GSS_KRB5P,
4153                 RPC_AUTH_GSS_KRB5I,
4154                 RPC_AUTH_GSS_KRB5,
4155                 RPC_AUTH_UNIX,                  /* courtesy */
4156                 RPC_AUTH_NULL,
4157         };
4158         int status = -EPERM;
4159         size_t i;
4160
4161         if (server->auth_info.flavor_len > 0) {
4162                 /* try each flavor specified by user */
4163                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4164                         status = nfs4_lookup_root_sec(server, fhandle, info,
4165                                                 server->auth_info.flavors[i]);
4166                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4167                                 continue;
4168                         break;
4169                 }
4170         } else {
4171                 /* no flavors specified by user, try default list */
4172                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4173                         status = nfs4_lookup_root_sec(server, fhandle, info,
4174                                                       flav_array[i]);
4175                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4176                                 continue;
4177                         break;
4178                 }
4179         }
4180
4181         /*
4182          * -EACCES could mean that the user doesn't have correct permissions
4183          * to access the mount.  It could also mean that we tried to mount
4184          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4185          * existing mount programs don't handle -EACCES very well so it should
4186          * be mapped to -EPERM instead.
4187          */
4188         if (status == -EACCES)
4189                 status = -EPERM;
4190         return status;
4191 }
4192
4193 /**
4194  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4195  * @server: initialized nfs_server handle
4196  * @fhandle: we fill in the pseudo-fs root file handle
4197  * @info: we fill in an FSINFO struct
4198  * @auth_probe: probe the auth flavours
4199  *
4200  * Returns zero on success, or a negative errno.
4201  */
4202 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4203                          struct nfs_fsinfo *info,
4204                          bool auth_probe)
4205 {
4206         int status = 0;
4207
4208         if (!auth_probe)
4209                 status = nfs4_lookup_root(server, fhandle, info);
4210
4211         if (auth_probe || status == NFS4ERR_WRONGSEC)
4212                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4213                                 fhandle, info);
4214
4215         if (status == 0)
4216                 status = nfs4_server_capabilities(server, fhandle);
4217         if (status == 0)
4218                 status = nfs4_do_fsinfo(server, fhandle, info);
4219
4220         return nfs4_map_errors(status);
4221 }
4222
4223 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4224                               struct nfs_fsinfo *info)
4225 {
4226         int error;
4227         struct nfs_fattr *fattr = info->fattr;
4228
4229         error = nfs4_server_capabilities(server, mntfh);
4230         if (error < 0) {
4231                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4232                 return error;
4233         }
4234
4235         error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4236         if (error < 0) {
4237                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4238                 goto out;
4239         }
4240
4241         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4242             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4243                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4244
4245 out:
4246         return error;
4247 }
4248
4249 /*
4250  * Get locations and (maybe) other attributes of a referral.
4251  * Note that we'll actually follow the referral later when
4252  * we detect fsid mismatch in inode revalidation
4253  */
4254 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4255                              const struct qstr *name, struct nfs_fattr *fattr,
4256                              struct nfs_fh *fhandle)
4257 {
4258         int status = -ENOMEM;
4259         struct page *page = NULL;
4260         struct nfs4_fs_locations *locations = NULL;
4261
4262         page = alloc_page(GFP_KERNEL);
4263         if (page == NULL)
4264                 goto out;
4265         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4266         if (locations == NULL)
4267                 goto out;
4268
4269         locations->fattr = fattr;
4270
4271         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4272         if (status != 0)
4273                 goto out;
4274
4275         /*
4276          * If the fsid didn't change, this is a migration event, not a
4277          * referral.  Cause us to drop into the exception handler, which
4278          * will kick off migration recovery.
4279          */
4280         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4281                 dprintk("%s: server did not return a different fsid for"
4282                         " a referral at %s\n", __func__, name->name);
4283                 status = -NFS4ERR_MOVED;
4284                 goto out;
4285         }
4286         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4287         nfs_fixup_referral_attributes(fattr);
4288         memset(fhandle, 0, sizeof(struct nfs_fh));
4289 out:
4290         if (page)
4291                 __free_page(page);
4292         kfree(locations);
4293         return status;
4294 }
4295
4296 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4297                                 struct nfs_fattr *fattr, struct inode *inode)
4298 {
4299         __u32 bitmask[NFS4_BITMASK_SZ];
4300         struct nfs4_getattr_arg args = {
4301                 .fh = fhandle,
4302                 .bitmask = bitmask,
4303         };
4304         struct nfs4_getattr_res res = {
4305                 .fattr = fattr,
4306                 .server = server,
4307         };
4308         struct rpc_message msg = {
4309                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4310                 .rpc_argp = &args,
4311                 .rpc_resp = &res,
4312         };
4313         unsigned short task_flags = 0;
4314
4315         if (nfs4_has_session(server->nfs_client))
4316                 task_flags = RPC_TASK_MOVEABLE;
4317
4318         /* Is this is an attribute revalidation, subject to softreval? */
4319         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4320                 task_flags |= RPC_TASK_TIMEOUT;
4321
4322         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4323         nfs_fattr_init(fattr);
4324         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4325         return nfs4_do_call_sync(server->client, server, &msg,
4326                         &args.seq_args, &res.seq_res, task_flags);
4327 }
4328
4329 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4330                                 struct nfs_fattr *fattr, struct inode *inode)
4331 {
4332         struct nfs4_exception exception = {
4333                 .interruptible = true,
4334         };
4335         int err;
4336         do {
4337                 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4338                 trace_nfs4_getattr(server, fhandle, fattr, err);
4339                 err = nfs4_handle_exception(server, err,
4340                                 &exception);
4341         } while (exception.retry);
4342         return err;
4343 }
4344
4345 /*
4346  * The file is not closed if it is opened due to the a request to change
4347  * the size of the file. The open call will not be needed once the
4348  * VFS layer lookup-intents are implemented.
4349  *
4350  * Close is called when the inode is destroyed.
4351  * If we haven't opened the file for O_WRONLY, we
4352  * need to in the size_change case to obtain a stateid.
4353  *
4354  * Got race?
4355  * Because OPEN is always done by name in nfsv4, it is
4356  * possible that we opened a different file by the same
4357  * name.  We can recognize this race condition, but we
4358  * can't do anything about it besides returning an error.
4359  *
4360  * This will be fixed with VFS changes (lookup-intent).
4361  */
4362 static int
4363 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4364                   struct iattr *sattr)
4365 {
4366         struct inode *inode = d_inode(dentry);
4367         const struct cred *cred = NULL;
4368         struct nfs_open_context *ctx = NULL;
4369         int status;
4370
4371         if (pnfs_ld_layoutret_on_setattr(inode) &&
4372             sattr->ia_valid & ATTR_SIZE &&
4373             sattr->ia_size < i_size_read(inode))
4374                 pnfs_commit_and_return_layout(inode);
4375
4376         nfs_fattr_init(fattr);
4377
4378         /* Deal with open(O_TRUNC) */
4379         if (sattr->ia_valid & ATTR_OPEN)
4380                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4381
4382         /* Optimization: if the end result is no change, don't RPC */
4383         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4384                 return 0;
4385
4386         /* Search for an existing open(O_WRITE) file */
4387         if (sattr->ia_valid & ATTR_FILE) {
4388
4389                 ctx = nfs_file_open_context(sattr->ia_file);
4390                 if (ctx)
4391                         cred = ctx->cred;
4392         }
4393
4394         /* Return any delegations if we're going to change ACLs */
4395         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4396                 nfs4_inode_make_writeable(inode);
4397
4398         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4399         if (status == 0) {
4400                 nfs_setattr_update_inode(inode, sattr, fattr);
4401                 nfs_setsecurity(inode, fattr);
4402         }
4403         return status;
4404 }
4405
4406 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4407                 struct dentry *dentry, struct nfs_fh *fhandle,
4408                 struct nfs_fattr *fattr)
4409 {
4410         struct nfs_server *server = NFS_SERVER(dir);
4411         int                    status;
4412         struct nfs4_lookup_arg args = {
4413                 .bitmask = server->attr_bitmask,
4414                 .dir_fh = NFS_FH(dir),
4415                 .name = &dentry->d_name,
4416         };
4417         struct nfs4_lookup_res res = {
4418                 .server = server,
4419                 .fattr = fattr,
4420                 .fh = fhandle,
4421         };
4422         struct rpc_message msg = {
4423                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4424                 .rpc_argp = &args,
4425                 .rpc_resp = &res,
4426         };
4427         unsigned short task_flags = 0;
4428
4429         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4430                 task_flags = RPC_TASK_MOVEABLE;
4431
4432         /* Is this is an attribute revalidation, subject to softreval? */
4433         if (nfs_lookup_is_soft_revalidate(dentry))
4434                 task_flags |= RPC_TASK_TIMEOUT;
4435
4436         args.bitmask = nfs4_bitmask(server, fattr->label);
4437
4438         nfs_fattr_init(fattr);
4439
4440         dprintk("NFS call  lookup %pd2\n", dentry);
4441         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4442         status = nfs4_do_call_sync(clnt, server, &msg,
4443                         &args.seq_args, &res.seq_res, task_flags);
4444         dprintk("NFS reply lookup: %d\n", status);
4445         return status;
4446 }
4447
4448 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4449 {
4450         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4451                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4452         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4453         fattr->nlink = 2;
4454 }
4455
4456 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4457                                    struct dentry *dentry, struct nfs_fh *fhandle,
4458                                    struct nfs_fattr *fattr)
4459 {
4460         struct nfs4_exception exception = {
4461                 .interruptible = true,
4462         };
4463         struct rpc_clnt *client = *clnt;
4464         const struct qstr *name = &dentry->d_name;
4465         int err;
4466         do {
4467                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4468                 trace_nfs4_lookup(dir, name, err);
4469                 switch (err) {
4470                 case -NFS4ERR_BADNAME:
4471                         err = -ENOENT;
4472                         goto out;
4473                 case -NFS4ERR_MOVED:
4474                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4475                         if (err == -NFS4ERR_MOVED)
4476                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4477                         goto out;
4478                 case -NFS4ERR_WRONGSEC:
4479                         err = -EPERM;
4480                         if (client != *clnt)
4481                                 goto out;
4482                         client = nfs4_negotiate_security(client, dir, name);
4483                         if (IS_ERR(client))
4484                                 return PTR_ERR(client);
4485
4486                         exception.retry = 1;
4487                         break;
4488                 default:
4489                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4490                 }
4491         } while (exception.retry);
4492
4493 out:
4494         if (err == 0)
4495                 *clnt = client;
4496         else if (client != *clnt)
4497                 rpc_shutdown_client(client);
4498
4499         return err;
4500 }
4501
4502 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4503                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4504 {
4505         int status;
4506         struct rpc_clnt *client = NFS_CLIENT(dir);
4507
4508         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4509         if (client != NFS_CLIENT(dir)) {
4510                 rpc_shutdown_client(client);
4511                 nfs_fixup_secinfo_attributes(fattr);
4512         }
4513         return status;
4514 }
4515
4516 struct rpc_clnt *
4517 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4518                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4519 {
4520         struct rpc_clnt *client = NFS_CLIENT(dir);
4521         int status;
4522
4523         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4524         if (status < 0)
4525                 return ERR_PTR(status);
4526         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4527 }
4528
4529 static int _nfs4_proc_lookupp(struct inode *inode,
4530                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4531 {
4532         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4533         struct nfs_server *server = NFS_SERVER(inode);
4534         int                    status;
4535         struct nfs4_lookupp_arg args = {
4536                 .bitmask = server->attr_bitmask,
4537                 .fh = NFS_FH(inode),
4538         };
4539         struct nfs4_lookupp_res res = {
4540                 .server = server,
4541                 .fattr = fattr,
4542                 .fh = fhandle,
4543         };
4544         struct rpc_message msg = {
4545                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4546                 .rpc_argp = &args,
4547                 .rpc_resp = &res,
4548         };
4549         unsigned short task_flags = 0;
4550
4551         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4552                 task_flags |= RPC_TASK_TIMEOUT;
4553
4554         args.bitmask = nfs4_bitmask(server, fattr->label);
4555
4556         nfs_fattr_init(fattr);
4557
4558         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4559         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4560                                 &res.seq_res, task_flags);
4561         dprintk("NFS reply lookupp: %d\n", status);
4562         return status;
4563 }
4564
4565 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4566                              struct nfs_fattr *fattr)
4567 {
4568         struct nfs4_exception exception = {
4569                 .interruptible = true,
4570         };
4571         int err;
4572         do {
4573                 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4574                 trace_nfs4_lookupp(inode, err);
4575                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4576                                 &exception);
4577         } while (exception.retry);
4578         return err;
4579 }
4580
4581 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4582                              const struct cred *cred)
4583 {
4584         struct nfs_server *server = NFS_SERVER(inode);
4585         struct nfs4_accessargs args = {
4586                 .fh = NFS_FH(inode),
4587                 .access = entry->mask,
4588         };
4589         struct nfs4_accessres res = {
4590                 .server = server,
4591         };
4592         struct rpc_message msg = {
4593                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4594                 .rpc_argp = &args,
4595                 .rpc_resp = &res,
4596                 .rpc_cred = cred,
4597         };
4598         int status = 0;
4599
4600         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4601                 res.fattr = nfs_alloc_fattr();
4602                 if (res.fattr == NULL)
4603                         return -ENOMEM;
4604                 args.bitmask = server->cache_consistency_bitmask;
4605         }
4606         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4607         if (!status) {
4608                 nfs_access_set_mask(entry, res.access);
4609                 if (res.fattr)
4610                         nfs_refresh_inode(inode, res.fattr);
4611         }
4612         nfs_free_fattr(res.fattr);
4613         return status;
4614 }
4615
4616 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4617                             const struct cred *cred)
4618 {
4619         struct nfs4_exception exception = {
4620                 .interruptible = true,
4621         };
4622         int err;
4623         do {
4624                 err = _nfs4_proc_access(inode, entry, cred);
4625                 trace_nfs4_access(inode, err);
4626                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4627                                 &exception);
4628         } while (exception.retry);
4629         return err;
4630 }
4631
4632 /*
4633  * TODO: For the time being, we don't try to get any attributes
4634  * along with any of the zero-copy operations READ, READDIR,
4635  * READLINK, WRITE.
4636  *
4637  * In the case of the first three, we want to put the GETATTR
4638  * after the read-type operation -- this is because it is hard
4639  * to predict the length of a GETATTR response in v4, and thus
4640  * align the READ data correctly.  This means that the GETATTR
4641  * may end up partially falling into the page cache, and we should
4642  * shift it into the 'tail' of the xdr_buf before processing.
4643  * To do this efficiently, we need to know the total length
4644  * of data received, which doesn't seem to be available outside
4645  * of the RPC layer.
4646  *
4647  * In the case of WRITE, we also want to put the GETATTR after
4648  * the operation -- in this case because we want to make sure
4649  * we get the post-operation mtime and size.
4650  *
4651  * Both of these changes to the XDR layer would in fact be quite
4652  * minor, but I decided to leave them for a subsequent patch.
4653  */
4654 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4655                 unsigned int pgbase, unsigned int pglen)
4656 {
4657         struct nfs4_readlink args = {
4658                 .fh       = NFS_FH(inode),
4659                 .pgbase   = pgbase,
4660                 .pglen    = pglen,
4661                 .pages    = &page,
4662         };
4663         struct nfs4_readlink_res res;
4664         struct rpc_message msg = {
4665                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4666                 .rpc_argp = &args,
4667                 .rpc_resp = &res,
4668         };
4669
4670         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4671 }
4672
4673 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4674                 unsigned int pgbase, unsigned int pglen)
4675 {
4676         struct nfs4_exception exception = {
4677                 .interruptible = true,
4678         };
4679         int err;
4680         do {
4681                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4682                 trace_nfs4_readlink(inode, err);
4683                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4684                                 &exception);
4685         } while (exception.retry);
4686         return err;
4687 }
4688
4689 /*
4690  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4691  */
4692 static int
4693 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4694                  int flags)
4695 {
4696         struct nfs_server *server = NFS_SERVER(dir);
4697         struct nfs4_label l, *ilabel;
4698         struct nfs_open_context *ctx;
4699         struct nfs4_state *state;
4700         int status = 0;
4701
4702         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4703         if (IS_ERR(ctx))
4704                 return PTR_ERR(ctx);
4705
4706         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4707
4708         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4709                 sattr->ia_mode &= ~current_umask();
4710         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4711         if (IS_ERR(state)) {
4712                 status = PTR_ERR(state);
4713                 goto out;
4714         }
4715 out:
4716         nfs4_label_release_security(ilabel);
4717         put_nfs_open_context(ctx);
4718         return status;
4719 }
4720
4721 static int
4722 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4723 {
4724         struct nfs_server *server = NFS_SERVER(dir);
4725         struct nfs_removeargs args = {
4726                 .fh = NFS_FH(dir),
4727                 .name = *name,
4728         };
4729         struct nfs_removeres res = {
4730                 .server = server,
4731         };
4732         struct rpc_message msg = {
4733                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4734                 .rpc_argp = &args,
4735                 .rpc_resp = &res,
4736         };
4737         unsigned long timestamp = jiffies;
4738         int status;
4739
4740         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4741         if (status == 0) {
4742                 spin_lock(&dir->i_lock);
4743                 /* Removing a directory decrements nlink in the parent */
4744                 if (ftype == NF4DIR && dir->i_nlink > 2)
4745                         nfs4_dec_nlink_locked(dir);
4746                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4747                                               NFS_INO_INVALID_DATA);
4748                 spin_unlock(&dir->i_lock);
4749         }
4750         return status;
4751 }
4752
4753 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4754 {
4755         struct nfs4_exception exception = {
4756                 .interruptible = true,
4757         };
4758         struct inode *inode = d_inode(dentry);
4759         int err;
4760
4761         if (inode) {
4762                 if (inode->i_nlink == 1)
4763                         nfs4_inode_return_delegation(inode);
4764                 else
4765                         nfs4_inode_make_writeable(inode);
4766         }
4767         do {
4768                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4769                 trace_nfs4_remove(dir, &dentry->d_name, err);
4770                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4771                                 &exception);
4772         } while (exception.retry);
4773         return err;
4774 }
4775
4776 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4777 {
4778         struct nfs4_exception exception = {
4779                 .interruptible = true,
4780         };
4781         int err;
4782
4783         do {
4784                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4785                 trace_nfs4_remove(dir, name, err);
4786                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4787                                 &exception);
4788         } while (exception.retry);
4789         return err;
4790 }
4791
4792 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4793                 struct dentry *dentry,
4794                 struct inode *inode)
4795 {
4796         struct nfs_removeargs *args = msg->rpc_argp;
4797         struct nfs_removeres *res = msg->rpc_resp;
4798
4799         res->server = NFS_SB(dentry->d_sb);
4800         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4801         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4802
4803         nfs_fattr_init(res->dir_attr);
4804
4805         if (inode) {
4806                 nfs4_inode_return_delegation(inode);
4807                 nfs_d_prune_case_insensitive_aliases(inode);
4808         }
4809 }
4810
4811 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4812 {
4813         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4814                         &data->args.seq_args,
4815                         &data->res.seq_res,
4816                         task);
4817 }
4818
4819 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4820 {
4821         struct nfs_unlinkdata *data = task->tk_calldata;
4822         struct nfs_removeres *res = &data->res;
4823
4824         if (!nfs4_sequence_done(task, &res->seq_res))
4825                 return 0;
4826         if (nfs4_async_handle_error(task, res->server, NULL,
4827                                     &data->timeout) == -EAGAIN)
4828                 return 0;
4829         if (task->tk_status == 0)
4830                 nfs4_update_changeattr(dir, &res->cinfo,
4831                                 res->dir_attr->time_start,
4832                                 NFS_INO_INVALID_DATA);
4833         return 1;
4834 }
4835
4836 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4837                 struct dentry *old_dentry,
4838                 struct dentry *new_dentry)
4839 {
4840         struct nfs_renameargs *arg = msg->rpc_argp;
4841         struct nfs_renameres *res = msg->rpc_resp;
4842         struct inode *old_inode = d_inode(old_dentry);
4843         struct inode *new_inode = d_inode(new_dentry);
4844
4845         if (old_inode)
4846                 nfs4_inode_make_writeable(old_inode);
4847         if (new_inode)
4848                 nfs4_inode_return_delegation(new_inode);
4849         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4850         res->server = NFS_SB(old_dentry->d_sb);
4851         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4852 }
4853
4854 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4855 {
4856         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4857                         &data->args.seq_args,
4858                         &data->res.seq_res,
4859                         task);
4860 }
4861
4862 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4863                                  struct inode *new_dir)
4864 {
4865         struct nfs_renamedata *data = task->tk_calldata;
4866         struct nfs_renameres *res = &data->res;
4867
4868         if (!nfs4_sequence_done(task, &res->seq_res))
4869                 return 0;
4870         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4871                 return 0;
4872
4873         if (task->tk_status == 0) {
4874                 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4875                 if (new_dir != old_dir) {
4876                         /* Note: If we moved a directory, nlink will change */
4877                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4878                                         res->old_fattr->time_start,
4879                                         NFS_INO_INVALID_NLINK |
4880                                             NFS_INO_INVALID_DATA);
4881                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4882                                         res->new_fattr->time_start,
4883                                         NFS_INO_INVALID_NLINK |
4884                                             NFS_INO_INVALID_DATA);
4885                 } else
4886                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4887                                         res->old_fattr->time_start,
4888                                         NFS_INO_INVALID_DATA);
4889         }
4890         return 1;
4891 }
4892
4893 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4894 {
4895         struct nfs_server *server = NFS_SERVER(inode);
4896         __u32 bitmask[NFS4_BITMASK_SZ];
4897         struct nfs4_link_arg arg = {
4898                 .fh     = NFS_FH(inode),
4899                 .dir_fh = NFS_FH(dir),
4900                 .name   = name,
4901                 .bitmask = bitmask,
4902         };
4903         struct nfs4_link_res res = {
4904                 .server = server,
4905         };
4906         struct rpc_message msg = {
4907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4908                 .rpc_argp = &arg,
4909                 .rpc_resp = &res,
4910         };
4911         int status = -ENOMEM;
4912
4913         res.fattr = nfs_alloc_fattr_with_label(server);
4914         if (res.fattr == NULL)
4915                 goto out;
4916
4917         nfs4_inode_make_writeable(inode);
4918         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4919                                 NFS_INO_INVALID_CHANGE);
4920         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4921         if (!status) {
4922                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4923                                        NFS_INO_INVALID_DATA);
4924                 nfs4_inc_nlink(inode);
4925                 status = nfs_post_op_update_inode(inode, res.fattr);
4926                 if (!status)
4927                         nfs_setsecurity(inode, res.fattr);
4928         }
4929
4930 out:
4931         nfs_free_fattr(res.fattr);
4932         return status;
4933 }
4934
4935 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4936 {
4937         struct nfs4_exception exception = {
4938                 .interruptible = true,
4939         };
4940         int err;
4941         do {
4942                 err = nfs4_handle_exception(NFS_SERVER(inode),
4943                                 _nfs4_proc_link(inode, dir, name),
4944                                 &exception);
4945         } while (exception.retry);
4946         return err;
4947 }
4948
4949 struct nfs4_createdata {
4950         struct rpc_message msg;
4951         struct nfs4_create_arg arg;
4952         struct nfs4_create_res res;
4953         struct nfs_fh fh;
4954         struct nfs_fattr fattr;
4955 };
4956
4957 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4958                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4959 {
4960         struct nfs4_createdata *data;
4961
4962         data = kzalloc(sizeof(*data), GFP_KERNEL);
4963         if (data != NULL) {
4964                 struct nfs_server *server = NFS_SERVER(dir);
4965
4966                 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4967                 if (IS_ERR(data->fattr.label))
4968                         goto out_free;
4969
4970                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4971                 data->msg.rpc_argp = &data->arg;
4972                 data->msg.rpc_resp = &data->res;
4973                 data->arg.dir_fh = NFS_FH(dir);
4974                 data->arg.server = server;
4975                 data->arg.name = name;
4976                 data->arg.attrs = sattr;
4977                 data->arg.ftype = ftype;
4978                 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
4979                 data->arg.umask = current_umask();
4980                 data->res.server = server;
4981                 data->res.fh = &data->fh;
4982                 data->res.fattr = &data->fattr;
4983                 nfs_fattr_init(data->res.fattr);
4984         }
4985         return data;
4986 out_free:
4987         kfree(data);
4988         return NULL;
4989 }
4990
4991 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4992 {
4993         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4994                                     &data->arg.seq_args, &data->res.seq_res, 1);
4995         if (status == 0) {
4996                 spin_lock(&dir->i_lock);
4997                 /* Creating a directory bumps nlink in the parent */
4998                 if (data->arg.ftype == NF4DIR)
4999                         nfs4_inc_nlink_locked(dir);
5000                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5001                                               data->res.fattr->time_start,
5002                                               NFS_INO_INVALID_DATA);
5003                 spin_unlock(&dir->i_lock);
5004                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5005         }
5006         return status;
5007 }
5008
5009 static void nfs4_free_createdata(struct nfs4_createdata *data)
5010 {
5011         nfs4_label_free(data->fattr.label);
5012         kfree(data);
5013 }
5014
5015 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5016                 struct page *page, unsigned int len, struct iattr *sattr,
5017                 struct nfs4_label *label)
5018 {
5019         struct nfs4_createdata *data;
5020         int status = -ENAMETOOLONG;
5021
5022         if (len > NFS4_MAXPATHLEN)
5023                 goto out;
5024
5025         status = -ENOMEM;
5026         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5027         if (data == NULL)
5028                 goto out;
5029
5030         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5031         data->arg.u.symlink.pages = &page;
5032         data->arg.u.symlink.len = len;
5033         data->arg.label = label;
5034
5035         status = nfs4_do_create(dir, dentry, data);
5036
5037         nfs4_free_createdata(data);
5038 out:
5039         return status;
5040 }
5041
5042 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5043                 struct page *page, unsigned int len, struct iattr *sattr)
5044 {
5045         struct nfs4_exception exception = {
5046                 .interruptible = true,
5047         };
5048         struct nfs4_label l, *label;
5049         int err;
5050
5051         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5052
5053         do {
5054                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
5055                 trace_nfs4_symlink(dir, &dentry->d_name, err);
5056                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5057                                 &exception);
5058         } while (exception.retry);
5059
5060         nfs4_label_release_security(label);
5061         return err;
5062 }
5063
5064 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5065                 struct iattr *sattr, struct nfs4_label *label)
5066 {
5067         struct nfs4_createdata *data;
5068         int status = -ENOMEM;
5069
5070         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5071         if (data == NULL)
5072                 goto out;
5073
5074         data->arg.label = label;
5075         status = nfs4_do_create(dir, dentry, data);
5076
5077         nfs4_free_createdata(data);
5078 out:
5079         return status;
5080 }
5081
5082 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5083                 struct iattr *sattr)
5084 {
5085         struct nfs_server *server = NFS_SERVER(dir);
5086         struct nfs4_exception exception = {
5087                 .interruptible = true,
5088         };
5089         struct nfs4_label l, *label;
5090         int err;
5091
5092         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5093
5094         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5095                 sattr->ia_mode &= ~current_umask();
5096         do {
5097                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5098                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5099                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5100                                 &exception);
5101         } while (exception.retry);
5102         nfs4_label_release_security(label);
5103
5104         return err;
5105 }
5106
5107 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5108                               struct nfs_readdir_res *nr_res)
5109 {
5110         struct inode            *dir = d_inode(nr_arg->dentry);
5111         struct nfs_server       *server = NFS_SERVER(dir);
5112         struct nfs4_readdir_arg args = {
5113                 .fh = NFS_FH(dir),
5114                 .pages = nr_arg->pages,
5115                 .pgbase = 0,
5116                 .count = nr_arg->page_len,
5117                 .plus = nr_arg->plus,
5118         };
5119         struct nfs4_readdir_res res;
5120         struct rpc_message msg = {
5121                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5122                 .rpc_argp = &args,
5123                 .rpc_resp = &res,
5124                 .rpc_cred = nr_arg->cred,
5125         };
5126         int                     status;
5127
5128         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5129                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5130         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5131                 args.bitmask = server->attr_bitmask_nl;
5132         else
5133                 args.bitmask = server->attr_bitmask;
5134
5135         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5136         res.pgbase = args.pgbase;
5137         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5138                         &res.seq_res, 0);
5139         if (status >= 0) {
5140                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5141                 status += args.pgbase;
5142         }
5143
5144         nfs_invalidate_atime(dir);
5145
5146         dprintk("%s: returns %d\n", __func__, status);
5147         return status;
5148 }
5149
5150 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5151                              struct nfs_readdir_res *res)
5152 {
5153         struct nfs4_exception exception = {
5154                 .interruptible = true,
5155         };
5156         int err;
5157         do {
5158                 err = _nfs4_proc_readdir(arg, res);
5159                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5160                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5161                                             err, &exception);
5162         } while (exception.retry);
5163         return err;
5164 }
5165
5166 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5167                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5168 {
5169         struct nfs4_createdata *data;
5170         int mode = sattr->ia_mode;
5171         int status = -ENOMEM;
5172
5173         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5174         if (data == NULL)
5175                 goto out;
5176
5177         if (S_ISFIFO(mode))
5178                 data->arg.ftype = NF4FIFO;
5179         else if (S_ISBLK(mode)) {
5180                 data->arg.ftype = NF4BLK;
5181                 data->arg.u.device.specdata1 = MAJOR(rdev);
5182                 data->arg.u.device.specdata2 = MINOR(rdev);
5183         }
5184         else if (S_ISCHR(mode)) {
5185                 data->arg.ftype = NF4CHR;
5186                 data->arg.u.device.specdata1 = MAJOR(rdev);
5187                 data->arg.u.device.specdata2 = MINOR(rdev);
5188         } else if (!S_ISSOCK(mode)) {
5189                 status = -EINVAL;
5190                 goto out_free;
5191         }
5192
5193         data->arg.label = label;
5194         status = nfs4_do_create(dir, dentry, data);
5195 out_free:
5196         nfs4_free_createdata(data);
5197 out:
5198         return status;
5199 }
5200
5201 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5202                 struct iattr *sattr, dev_t rdev)
5203 {
5204         struct nfs_server *server = NFS_SERVER(dir);
5205         struct nfs4_exception exception = {
5206                 .interruptible = true,
5207         };
5208         struct nfs4_label l, *label;
5209         int err;
5210
5211         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5212
5213         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5214                 sattr->ia_mode &= ~current_umask();
5215         do {
5216                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5217                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5218                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5219                                 &exception);
5220         } while (exception.retry);
5221
5222         nfs4_label_release_security(label);
5223
5224         return err;
5225 }
5226
5227 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5228                  struct nfs_fsstat *fsstat)
5229 {
5230         struct nfs4_statfs_arg args = {
5231                 .fh = fhandle,
5232                 .bitmask = server->attr_bitmask,
5233         };
5234         struct nfs4_statfs_res res = {
5235                 .fsstat = fsstat,
5236         };
5237         struct rpc_message msg = {
5238                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5239                 .rpc_argp = &args,
5240                 .rpc_resp = &res,
5241         };
5242
5243         nfs_fattr_init(fsstat->fattr);
5244         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5245 }
5246
5247 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5248 {
5249         struct nfs4_exception exception = {
5250                 .interruptible = true,
5251         };
5252         int err;
5253         do {
5254                 err = nfs4_handle_exception(server,
5255                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5256                                 &exception);
5257         } while (exception.retry);
5258         return err;
5259 }
5260
5261 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5262                 struct nfs_fsinfo *fsinfo)
5263 {
5264         struct nfs4_fsinfo_arg args = {
5265                 .fh = fhandle,
5266                 .bitmask = server->attr_bitmask,
5267         };
5268         struct nfs4_fsinfo_res res = {
5269                 .fsinfo = fsinfo,
5270         };
5271         struct rpc_message msg = {
5272                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5273                 .rpc_argp = &args,
5274                 .rpc_resp = &res,
5275         };
5276
5277         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5278 }
5279
5280 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5281 {
5282         struct nfs4_exception exception = {
5283                 .interruptible = true,
5284         };
5285         int err;
5286
5287         do {
5288                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5289                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5290                 if (err == 0) {
5291                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5292                         break;
5293                 }
5294                 err = nfs4_handle_exception(server, err, &exception);
5295         } while (exception.retry);
5296         return err;
5297 }
5298
5299 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5300 {
5301         int error;
5302
5303         nfs_fattr_init(fsinfo->fattr);
5304         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5305         if (error == 0) {
5306                 /* block layout checks this! */
5307                 server->pnfs_blksize = fsinfo->blksize;
5308                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5309         }
5310
5311         return error;
5312 }
5313
5314 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5315                 struct nfs_pathconf *pathconf)
5316 {
5317         struct nfs4_pathconf_arg args = {
5318                 .fh = fhandle,
5319                 .bitmask = server->attr_bitmask,
5320         };
5321         struct nfs4_pathconf_res res = {
5322                 .pathconf = pathconf,
5323         };
5324         struct rpc_message msg = {
5325                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5326                 .rpc_argp = &args,
5327                 .rpc_resp = &res,
5328         };
5329
5330         /* None of the pathconf attributes are mandatory to implement */
5331         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5332                 memset(pathconf, 0, sizeof(*pathconf));
5333                 return 0;
5334         }
5335
5336         nfs_fattr_init(pathconf->fattr);
5337         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5338 }
5339
5340 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5341                 struct nfs_pathconf *pathconf)
5342 {
5343         struct nfs4_exception exception = {
5344                 .interruptible = true,
5345         };
5346         int err;
5347
5348         do {
5349                 err = nfs4_handle_exception(server,
5350                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5351                                 &exception);
5352         } while (exception.retry);
5353         return err;
5354 }
5355
5356 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5357                 const struct nfs_open_context *ctx,
5358                 const struct nfs_lock_context *l_ctx,
5359                 fmode_t fmode)
5360 {
5361         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5362 }
5363 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5364
5365 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5366                 const struct nfs_open_context *ctx,
5367                 const struct nfs_lock_context *l_ctx,
5368                 fmode_t fmode)
5369 {
5370         nfs4_stateid _current_stateid;
5371
5372         /* If the current stateid represents a lost lock, then exit */
5373         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5374                 return true;
5375         return nfs4_stateid_match(stateid, &_current_stateid);
5376 }
5377
5378 static bool nfs4_error_stateid_expired(int err)
5379 {
5380         switch (err) {
5381         case -NFS4ERR_DELEG_REVOKED:
5382         case -NFS4ERR_ADMIN_REVOKED:
5383         case -NFS4ERR_BAD_STATEID:
5384         case -NFS4ERR_STALE_STATEID:
5385         case -NFS4ERR_OLD_STATEID:
5386         case -NFS4ERR_OPENMODE:
5387         case -NFS4ERR_EXPIRED:
5388                 return true;
5389         }
5390         return false;
5391 }
5392
5393 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5394 {
5395         struct nfs_server *server = NFS_SERVER(hdr->inode);
5396
5397         trace_nfs4_read(hdr, task->tk_status);
5398         if (task->tk_status < 0) {
5399                 struct nfs4_exception exception = {
5400                         .inode = hdr->inode,
5401                         .state = hdr->args.context->state,
5402                         .stateid = &hdr->args.stateid,
5403                 };
5404                 task->tk_status = nfs4_async_handle_exception(task,
5405                                 server, task->tk_status, &exception);
5406                 if (exception.retry) {
5407                         rpc_restart_call_prepare(task);
5408                         return -EAGAIN;
5409                 }
5410         }
5411
5412         if (task->tk_status > 0)
5413                 renew_lease(server, hdr->timestamp);
5414         return 0;
5415 }
5416
5417 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5418                 struct nfs_pgio_args *args)
5419 {
5420
5421         if (!nfs4_error_stateid_expired(task->tk_status) ||
5422                 nfs4_stateid_is_current(&args->stateid,
5423                                 args->context,
5424                                 args->lock_context,
5425                                 FMODE_READ))
5426                 return false;
5427         rpc_restart_call_prepare(task);
5428         return true;
5429 }
5430
5431 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5432                                          struct nfs_pgio_header *hdr)
5433 {
5434         struct nfs_server *server = NFS_SERVER(hdr->inode);
5435         struct rpc_message *msg = &task->tk_msg;
5436
5437         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5438             server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5439                 server->caps &= ~NFS_CAP_READ_PLUS;
5440                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5441                 rpc_restart_call_prepare(task);
5442                 return true;
5443         }
5444         return false;
5445 }
5446
5447 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5448 {
5449         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5450                 return -EAGAIN;
5451         if (nfs4_read_stateid_changed(task, &hdr->args))
5452                 return -EAGAIN;
5453         if (nfs4_read_plus_not_supported(task, hdr))
5454                 return -EAGAIN;
5455         if (task->tk_status > 0)
5456                 nfs_invalidate_atime(hdr->inode);
5457         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5458                                     nfs4_read_done_cb(task, hdr);
5459 }
5460
5461 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5462 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5463                                     struct rpc_message *msg)
5464 {
5465         /* Note: We don't use READ_PLUS with pNFS yet */
5466         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp)
5467                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5468 }
5469 #else
5470 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5471                                     struct rpc_message *msg)
5472 {
5473 }
5474 #endif /* CONFIG_NFS_V4_2 */
5475
5476 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5477                                  struct rpc_message *msg)
5478 {
5479         hdr->timestamp   = jiffies;
5480         if (!hdr->pgio_done_cb)
5481                 hdr->pgio_done_cb = nfs4_read_done_cb;
5482         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5483         nfs42_read_plus_support(hdr, msg);
5484         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5485 }
5486
5487 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5488                                       struct nfs_pgio_header *hdr)
5489 {
5490         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5491                         &hdr->args.seq_args,
5492                         &hdr->res.seq_res,
5493                         task))
5494                 return 0;
5495         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5496                                 hdr->args.lock_context,
5497                                 hdr->rw_mode) == -EIO)
5498                 return -EIO;
5499         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5500                 return -EIO;
5501         return 0;
5502 }
5503
5504 static int nfs4_write_done_cb(struct rpc_task *task,
5505                               struct nfs_pgio_header *hdr)
5506 {
5507         struct inode *inode = hdr->inode;
5508
5509         trace_nfs4_write(hdr, task->tk_status);
5510         if (task->tk_status < 0) {
5511                 struct nfs4_exception exception = {
5512                         .inode = hdr->inode,
5513                         .state = hdr->args.context->state,
5514                         .stateid = &hdr->args.stateid,
5515                 };
5516                 task->tk_status = nfs4_async_handle_exception(task,
5517                                 NFS_SERVER(inode), task->tk_status,
5518                                 &exception);
5519                 if (exception.retry) {
5520                         rpc_restart_call_prepare(task);
5521                         return -EAGAIN;
5522                 }
5523         }
5524         if (task->tk_status >= 0) {
5525                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5526                 nfs_writeback_update_inode(hdr);
5527         }
5528         return 0;
5529 }
5530
5531 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5532                 struct nfs_pgio_args *args)
5533 {
5534
5535         if (!nfs4_error_stateid_expired(task->tk_status) ||
5536                 nfs4_stateid_is_current(&args->stateid,
5537                                 args->context,
5538                                 args->lock_context,
5539                                 FMODE_WRITE))
5540                 return false;
5541         rpc_restart_call_prepare(task);
5542         return true;
5543 }
5544
5545 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5546 {
5547         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5548                 return -EAGAIN;
5549         if (nfs4_write_stateid_changed(task, &hdr->args))
5550                 return -EAGAIN;
5551         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5552                 nfs4_write_done_cb(task, hdr);
5553 }
5554
5555 static
5556 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5557 {
5558         /* Don't request attributes for pNFS or O_DIRECT writes */
5559         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5560                 return false;
5561         /* Otherwise, request attributes if and only if we don't hold
5562          * a delegation
5563          */
5564         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5565 }
5566
5567 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5568                       struct inode *inode, unsigned long cache_validity)
5569 {
5570         struct nfs_server *server = NFS_SERVER(inode);
5571         unsigned int i;
5572
5573         memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5574         cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5575
5576         if (cache_validity & NFS_INO_INVALID_CHANGE)
5577                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5578         if (cache_validity & NFS_INO_INVALID_ATIME)
5579                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5580         if (cache_validity & NFS_INO_INVALID_MODE)
5581                 bitmask[1] |= FATTR4_WORD1_MODE;
5582         if (cache_validity & NFS_INO_INVALID_OTHER)
5583                 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5584         if (cache_validity & NFS_INO_INVALID_NLINK)
5585                 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5586         if (cache_validity & NFS_INO_INVALID_CTIME)
5587                 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5588         if (cache_validity & NFS_INO_INVALID_MTIME)
5589                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5590         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5591                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5592
5593         if (cache_validity & NFS_INO_INVALID_SIZE)
5594                 bitmask[0] |= FATTR4_WORD0_SIZE;
5595
5596         for (i = 0; i < NFS4_BITMASK_SZ; i++)
5597                 bitmask[i] &= server->attr_bitmask[i];
5598 }
5599
5600 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5601                                   struct rpc_message *msg,
5602                                   struct rpc_clnt **clnt)
5603 {
5604         struct nfs_server *server = NFS_SERVER(hdr->inode);
5605
5606         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5607                 hdr->args.bitmask = NULL;
5608                 hdr->res.fattr = NULL;
5609         } else {
5610                 nfs4_bitmask_set(hdr->args.bitmask_store,
5611                                  server->cache_consistency_bitmask,
5612                                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5613                 hdr->args.bitmask = hdr->args.bitmask_store;
5614         }
5615
5616         if (!hdr->pgio_done_cb)
5617                 hdr->pgio_done_cb = nfs4_write_done_cb;
5618         hdr->res.server = server;
5619         hdr->timestamp   = jiffies;
5620
5621         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5622         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5623         nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5624 }
5625
5626 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5627 {
5628         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5629                         &data->args.seq_args,
5630                         &data->res.seq_res,
5631                         task);
5632 }
5633
5634 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5635 {
5636         struct inode *inode = data->inode;
5637
5638         trace_nfs4_commit(data, task->tk_status);
5639         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5640                                     NULL, NULL) == -EAGAIN) {
5641                 rpc_restart_call_prepare(task);
5642                 return -EAGAIN;
5643         }
5644         return 0;
5645 }
5646
5647 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5648 {
5649         if (!nfs4_sequence_done(task, &data->res.seq_res))
5650                 return -EAGAIN;
5651         return data->commit_done_cb(task, data);
5652 }
5653
5654 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5655                                    struct rpc_clnt **clnt)
5656 {
5657         struct nfs_server *server = NFS_SERVER(data->inode);
5658
5659         if (data->commit_done_cb == NULL)
5660                 data->commit_done_cb = nfs4_commit_done_cb;
5661         data->res.server = server;
5662         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5663         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5664         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5665 }
5666
5667 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5668                                 struct nfs_commitres *res)
5669 {
5670         struct inode *dst_inode = file_inode(dst);
5671         struct nfs_server *server = NFS_SERVER(dst_inode);
5672         struct rpc_message msg = {
5673                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5674                 .rpc_argp = args,
5675                 .rpc_resp = res,
5676         };
5677
5678         args->fh = NFS_FH(dst_inode);
5679         return nfs4_call_sync(server->client, server, &msg,
5680                         &args->seq_args, &res->seq_res, 1);
5681 }
5682
5683 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5684 {
5685         struct nfs_commitargs args = {
5686                 .offset = offset,
5687                 .count = count,
5688         };
5689         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5690         struct nfs4_exception exception = { };
5691         int status;
5692
5693         do {
5694                 status = _nfs4_proc_commit(dst, &args, res);
5695                 status = nfs4_handle_exception(dst_server, status, &exception);
5696         } while (exception.retry);
5697
5698         return status;
5699 }
5700
5701 struct nfs4_renewdata {
5702         struct nfs_client       *client;
5703         unsigned long           timestamp;
5704 };
5705
5706 /*
5707  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5708  * standalone procedure for queueing an asynchronous RENEW.
5709  */
5710 static void nfs4_renew_release(void *calldata)
5711 {
5712         struct nfs4_renewdata *data = calldata;
5713         struct nfs_client *clp = data->client;
5714
5715         if (refcount_read(&clp->cl_count) > 1)
5716                 nfs4_schedule_state_renewal(clp);
5717         nfs_put_client(clp);
5718         kfree(data);
5719 }
5720
5721 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5722 {
5723         struct nfs4_renewdata *data = calldata;
5724         struct nfs_client *clp = data->client;
5725         unsigned long timestamp = data->timestamp;
5726
5727         trace_nfs4_renew_async(clp, task->tk_status);
5728         switch (task->tk_status) {
5729         case 0:
5730                 break;
5731         case -NFS4ERR_LEASE_MOVED:
5732                 nfs4_schedule_lease_moved_recovery(clp);
5733                 break;
5734         default:
5735                 /* Unless we're shutting down, schedule state recovery! */
5736                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5737                         return;
5738                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5739                         nfs4_schedule_lease_recovery(clp);
5740                         return;
5741                 }
5742                 nfs4_schedule_path_down_recovery(clp);
5743         }
5744         do_renew_lease(clp, timestamp);
5745 }
5746
5747 static const struct rpc_call_ops nfs4_renew_ops = {
5748         .rpc_call_done = nfs4_renew_done,
5749         .rpc_release = nfs4_renew_release,
5750 };
5751
5752 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5753 {
5754         struct rpc_message msg = {
5755                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5756                 .rpc_argp       = clp,
5757                 .rpc_cred       = cred,
5758         };
5759         struct nfs4_renewdata *data;
5760
5761         if (renew_flags == 0)
5762                 return 0;
5763         if (!refcount_inc_not_zero(&clp->cl_count))
5764                 return -EIO;
5765         data = kmalloc(sizeof(*data), GFP_NOFS);
5766         if (data == NULL) {
5767                 nfs_put_client(clp);
5768                 return -ENOMEM;
5769         }
5770         data->client = clp;
5771         data->timestamp = jiffies;
5772         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5773                         &nfs4_renew_ops, data);
5774 }
5775
5776 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5777 {
5778         struct rpc_message msg = {
5779                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5780                 .rpc_argp       = clp,
5781                 .rpc_cred       = cred,
5782         };
5783         unsigned long now = jiffies;
5784         int status;
5785
5786         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5787         if (status < 0)
5788                 return status;
5789         do_renew_lease(clp, now);
5790         return 0;
5791 }
5792
5793 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5794                                       enum nfs4_acl_type type)
5795 {
5796         switch (type) {
5797         default:
5798                 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5799         case NFS4ACL_DACL:
5800                 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5801         case NFS4ACL_SACL:
5802                 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5803         }
5804 }
5805
5806 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5807  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5808  * the stack.
5809  */
5810 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5811
5812 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5813                 struct page **pages)
5814 {
5815         struct page *newpage, **spages;
5816         int rc = 0;
5817         size_t len;
5818         spages = pages;
5819
5820         do {
5821                 len = min_t(size_t, PAGE_SIZE, buflen);
5822                 newpage = alloc_page(GFP_KERNEL);
5823
5824                 if (newpage == NULL)
5825                         goto unwind;
5826                 memcpy(page_address(newpage), buf, len);
5827                 buf += len;
5828                 buflen -= len;
5829                 *pages++ = newpage;
5830                 rc++;
5831         } while (buflen != 0);
5832
5833         return rc;
5834
5835 unwind:
5836         for(; rc > 0; rc--)
5837                 __free_page(spages[rc-1]);
5838         return -ENOMEM;
5839 }
5840
5841 struct nfs4_cached_acl {
5842         enum nfs4_acl_type type;
5843         int cached;
5844         size_t len;
5845         char data[];
5846 };
5847
5848 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5849 {
5850         struct nfs_inode *nfsi = NFS_I(inode);
5851
5852         spin_lock(&inode->i_lock);
5853         kfree(nfsi->nfs4_acl);
5854         nfsi->nfs4_acl = acl;
5855         spin_unlock(&inode->i_lock);
5856 }
5857
5858 static void nfs4_zap_acl_attr(struct inode *inode)
5859 {
5860         nfs4_set_cached_acl(inode, NULL);
5861 }
5862
5863 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5864                                     size_t buflen, enum nfs4_acl_type type)
5865 {
5866         struct nfs_inode *nfsi = NFS_I(inode);
5867         struct nfs4_cached_acl *acl;
5868         int ret = -ENOENT;
5869
5870         spin_lock(&inode->i_lock);
5871         acl = nfsi->nfs4_acl;
5872         if (acl == NULL)
5873                 goto out;
5874         if (acl->type != type)
5875                 goto out;
5876         if (buf == NULL) /* user is just asking for length */
5877                 goto out_len;
5878         if (acl->cached == 0)
5879                 goto out;
5880         ret = -ERANGE; /* see getxattr(2) man page */
5881         if (acl->len > buflen)
5882                 goto out;
5883         memcpy(buf, acl->data, acl->len);
5884 out_len:
5885         ret = acl->len;
5886 out:
5887         spin_unlock(&inode->i_lock);
5888         return ret;
5889 }
5890
5891 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5892                                   size_t pgbase, size_t acl_len,
5893                                   enum nfs4_acl_type type)
5894 {
5895         struct nfs4_cached_acl *acl;
5896         size_t buflen = sizeof(*acl) + acl_len;
5897
5898         if (buflen <= PAGE_SIZE) {
5899                 acl = kmalloc(buflen, GFP_KERNEL);
5900                 if (acl == NULL)
5901                         goto out;
5902                 acl->cached = 1;
5903                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5904         } else {
5905                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5906                 if (acl == NULL)
5907                         goto out;
5908                 acl->cached = 0;
5909         }
5910         acl->type = type;
5911         acl->len = acl_len;
5912 out:
5913         nfs4_set_cached_acl(inode, acl);
5914 }
5915
5916 /*
5917  * The getxattr API returns the required buffer length when called with a
5918  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5919  * the required buf.  On a NULL buf, we send a page of data to the server
5920  * guessing that the ACL request can be serviced by a page. If so, we cache
5921  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5922  * the cache. If not so, we throw away the page, and cache the required
5923  * length. The next getxattr call will then produce another round trip to
5924  * the server, this time with the input buf of the required size.
5925  */
5926 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5927                                        size_t buflen, enum nfs4_acl_type type)
5928 {
5929         struct page **pages;
5930         struct nfs_getaclargs args = {
5931                 .fh = NFS_FH(inode),
5932                 .acl_type = type,
5933                 .acl_len = buflen,
5934         };
5935         struct nfs_getaclres res = {
5936                 .acl_type = type,
5937                 .acl_len = buflen,
5938         };
5939         struct rpc_message msg = {
5940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5941                 .rpc_argp = &args,
5942                 .rpc_resp = &res,
5943         };
5944         unsigned int npages;
5945         int ret = -ENOMEM, i;
5946         struct nfs_server *server = NFS_SERVER(inode);
5947
5948         if (buflen == 0)
5949                 buflen = server->rsize;
5950
5951         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5952         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5953         if (!pages)
5954                 return -ENOMEM;
5955
5956         args.acl_pages = pages;
5957
5958         for (i = 0; i < npages; i++) {
5959                 pages[i] = alloc_page(GFP_KERNEL);
5960                 if (!pages[i])
5961                         goto out_free;
5962         }
5963
5964         /* for decoding across pages */
5965         res.acl_scratch = alloc_page(GFP_KERNEL);
5966         if (!res.acl_scratch)
5967                 goto out_free;
5968
5969         args.acl_len = npages * PAGE_SIZE;
5970
5971         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5972                 __func__, buf, buflen, npages, args.acl_len);
5973         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5974                              &msg, &args.seq_args, &res.seq_res, 0);
5975         if (ret)
5976                 goto out_free;
5977
5978         /* Handle the case where the passed-in buffer is too short */
5979         if (res.acl_flags & NFS4_ACL_TRUNC) {
5980                 /* Did the user only issue a request for the acl length? */
5981                 if (buf == NULL)
5982                         goto out_ok;
5983                 ret = -ERANGE;
5984                 goto out_free;
5985         }
5986         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
5987                               type);
5988         if (buf) {
5989                 if (res.acl_len > buflen) {
5990                         ret = -ERANGE;
5991                         goto out_free;
5992                 }
5993                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5994         }
5995 out_ok:
5996         ret = res.acl_len;
5997 out_free:
5998         for (i = 0; i < npages; i++)
5999                 if (pages[i])
6000                         __free_page(pages[i]);
6001         if (res.acl_scratch)
6002                 __free_page(res.acl_scratch);
6003         kfree(pages);
6004         return ret;
6005 }
6006
6007 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6008                                      size_t buflen, enum nfs4_acl_type type)
6009 {
6010         struct nfs4_exception exception = {
6011                 .interruptible = true,
6012         };
6013         ssize_t ret;
6014         do {
6015                 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6016                 trace_nfs4_get_acl(inode, ret);
6017                 if (ret >= 0)
6018                         break;
6019                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6020         } while (exception.retry);
6021         return ret;
6022 }
6023
6024 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6025                                  enum nfs4_acl_type type)
6026 {
6027         struct nfs_server *server = NFS_SERVER(inode);
6028         int ret;
6029
6030         if (!nfs4_server_supports_acls(server, type))
6031                 return -EOPNOTSUPP;
6032         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6033         if (ret < 0)
6034                 return ret;
6035         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6036                 nfs_zap_acl_cache(inode);
6037         ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6038         if (ret != -ENOENT)
6039                 /* -ENOENT is returned if there is no ACL or if there is an ACL
6040                  * but no cached acl data, just the acl length */
6041                 return ret;
6042         return nfs4_get_acl_uncached(inode, buf, buflen, type);
6043 }
6044
6045 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6046                                size_t buflen, enum nfs4_acl_type type)
6047 {
6048         struct nfs_server *server = NFS_SERVER(inode);
6049         struct page *pages[NFS4ACL_MAXPAGES];
6050         struct nfs_setaclargs arg = {
6051                 .fh = NFS_FH(inode),
6052                 .acl_type = type,
6053                 .acl_len = buflen,
6054                 .acl_pages = pages,
6055         };
6056         struct nfs_setaclres res;
6057         struct rpc_message msg = {
6058                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6059                 .rpc_argp       = &arg,
6060                 .rpc_resp       = &res,
6061         };
6062         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6063         int ret, i;
6064
6065         /* You can't remove system.nfs4_acl: */
6066         if (buflen == 0)
6067                 return -EINVAL;
6068         if (!nfs4_server_supports_acls(server, type))
6069                 return -EOPNOTSUPP;
6070         if (npages > ARRAY_SIZE(pages))
6071                 return -ERANGE;
6072         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6073         if (i < 0)
6074                 return i;
6075         nfs4_inode_make_writeable(inode);
6076         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6077
6078         /*
6079          * Free each page after tx, so the only ref left is
6080          * held by the network stack
6081          */
6082         for (; i > 0; i--)
6083                 put_page(pages[i-1]);
6084
6085         /*
6086          * Acl update can result in inode attribute update.
6087          * so mark the attribute cache invalid.
6088          */
6089         spin_lock(&inode->i_lock);
6090         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6091                                              NFS_INO_INVALID_CTIME |
6092                                              NFS_INO_REVAL_FORCED);
6093         spin_unlock(&inode->i_lock);
6094         nfs_access_zap_cache(inode);
6095         nfs_zap_acl_cache(inode);
6096         return ret;
6097 }
6098
6099 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6100                              size_t buflen, enum nfs4_acl_type type)
6101 {
6102         struct nfs4_exception exception = { };
6103         int err;
6104         do {
6105                 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6106                 trace_nfs4_set_acl(inode, err);
6107                 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6108                         /*
6109                          * no need to retry since the kernel
6110                          * isn't involved in encoding the ACEs.
6111                          */
6112                         err = -EINVAL;
6113                         break;
6114                 }
6115                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6116                                 &exception);
6117         } while (exception.retry);
6118         return err;
6119 }
6120
6121 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6122 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6123                                         size_t buflen)
6124 {
6125         struct nfs_server *server = NFS_SERVER(inode);
6126         struct nfs4_label label = {0, 0, buflen, buf};
6127
6128         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6129         struct nfs_fattr fattr = {
6130                 .label = &label,
6131         };
6132         struct nfs4_getattr_arg arg = {
6133                 .fh             = NFS_FH(inode),
6134                 .bitmask        = bitmask,
6135         };
6136         struct nfs4_getattr_res res = {
6137                 .fattr          = &fattr,
6138                 .server         = server,
6139         };
6140         struct rpc_message msg = {
6141                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6142                 .rpc_argp       = &arg,
6143                 .rpc_resp       = &res,
6144         };
6145         int ret;
6146
6147         nfs_fattr_init(&fattr);
6148
6149         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6150         if (ret)
6151                 return ret;
6152         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6153                 return -ENOENT;
6154         return label.len;
6155 }
6156
6157 static int nfs4_get_security_label(struct inode *inode, void *buf,
6158                                         size_t buflen)
6159 {
6160         struct nfs4_exception exception = {
6161                 .interruptible = true,
6162         };
6163         int err;
6164
6165         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6166                 return -EOPNOTSUPP;
6167
6168         do {
6169                 err = _nfs4_get_security_label(inode, buf, buflen);
6170                 trace_nfs4_get_security_label(inode, err);
6171                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6172                                 &exception);
6173         } while (exception.retry);
6174         return err;
6175 }
6176
6177 static int _nfs4_do_set_security_label(struct inode *inode,
6178                 struct nfs4_label *ilabel,
6179                 struct nfs_fattr *fattr)
6180 {
6181
6182         struct iattr sattr = {0};
6183         struct nfs_server *server = NFS_SERVER(inode);
6184         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6185         struct nfs_setattrargs arg = {
6186                 .fh             = NFS_FH(inode),
6187                 .iap            = &sattr,
6188                 .server         = server,
6189                 .bitmask        = bitmask,
6190                 .label          = ilabel,
6191         };
6192         struct nfs_setattrres res = {
6193                 .fattr          = fattr,
6194                 .server         = server,
6195         };
6196         struct rpc_message msg = {
6197                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6198                 .rpc_argp       = &arg,
6199                 .rpc_resp       = &res,
6200         };
6201         int status;
6202
6203         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6204
6205         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6206         if (status)
6207                 dprintk("%s failed: %d\n", __func__, status);
6208
6209         return status;
6210 }
6211
6212 static int nfs4_do_set_security_label(struct inode *inode,
6213                 struct nfs4_label *ilabel,
6214                 struct nfs_fattr *fattr)
6215 {
6216         struct nfs4_exception exception = { };
6217         int err;
6218
6219         do {
6220                 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6221                 trace_nfs4_set_security_label(inode, err);
6222                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6223                                 &exception);
6224         } while (exception.retry);
6225         return err;
6226 }
6227
6228 static int
6229 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6230 {
6231         struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6232         struct nfs_fattr *fattr;
6233         int status;
6234
6235         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6236                 return -EOPNOTSUPP;
6237
6238         fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6239         if (fattr == NULL)
6240                 return -ENOMEM;
6241
6242         status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6243         if (status == 0)
6244                 nfs_setsecurity(inode, fattr);
6245
6246         return status;
6247 }
6248 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6249
6250
6251 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6252                                     nfs4_verifier *bootverf)
6253 {
6254         __be32 verf[2];
6255
6256         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6257                 /* An impossible timestamp guarantees this value
6258                  * will never match a generated boot time. */
6259                 verf[0] = cpu_to_be32(U32_MAX);
6260                 verf[1] = cpu_to_be32(U32_MAX);
6261         } else {
6262                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6263                 u64 ns = ktime_to_ns(nn->boot_time);
6264
6265                 verf[0] = cpu_to_be32(ns >> 32);
6266                 verf[1] = cpu_to_be32(ns);
6267         }
6268         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6269 }
6270
6271 static size_t
6272 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6273 {
6274         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6275         struct nfs_netns_client *nn_clp = nn->nfs_client;
6276         const char *id;
6277
6278         buf[0] = '\0';
6279
6280         if (nn_clp) {
6281                 rcu_read_lock();
6282                 id = rcu_dereference(nn_clp->identifier);
6283                 if (id)
6284                         strscpy(buf, id, buflen);
6285                 rcu_read_unlock();
6286         }
6287
6288         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6289                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6290
6291         return strlen(buf);
6292 }
6293
6294 static int
6295 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6296 {
6297         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6298         size_t buflen;
6299         size_t len;
6300         char *str;
6301
6302         if (clp->cl_owner_id != NULL)
6303                 return 0;
6304
6305         rcu_read_lock();
6306         len = 14 +
6307                 strlen(clp->cl_rpcclient->cl_nodename) +
6308                 1 +
6309                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6310                 1;
6311         rcu_read_unlock();
6312
6313         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6314         if (buflen)
6315                 len += buflen + 1;
6316
6317         if (len > NFS4_OPAQUE_LIMIT + 1)
6318                 return -EINVAL;
6319
6320         /*
6321          * Since this string is allocated at mount time, and held until the
6322          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6323          * about a memory-reclaim deadlock.
6324          */
6325         str = kmalloc(len, GFP_KERNEL);
6326         if (!str)
6327                 return -ENOMEM;
6328
6329         rcu_read_lock();
6330         if (buflen)
6331                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6332                           clp->cl_rpcclient->cl_nodename, buf,
6333                           rpc_peeraddr2str(clp->cl_rpcclient,
6334                                            RPC_DISPLAY_ADDR));
6335         else
6336                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6337                           clp->cl_rpcclient->cl_nodename,
6338                           rpc_peeraddr2str(clp->cl_rpcclient,
6339                                            RPC_DISPLAY_ADDR));
6340         rcu_read_unlock();
6341
6342         clp->cl_owner_id = str;
6343         return 0;
6344 }
6345
6346 static int
6347 nfs4_init_uniform_client_string(struct nfs_client *clp)
6348 {
6349         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6350         size_t buflen;
6351         size_t len;
6352         char *str;
6353
6354         if (clp->cl_owner_id != NULL)
6355                 return 0;
6356
6357         len = 10 + 10 + 1 + 10 + 1 +
6358                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6359
6360         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6361         if (buflen)
6362                 len += buflen + 1;
6363
6364         if (len > NFS4_OPAQUE_LIMIT + 1)
6365                 return -EINVAL;
6366
6367         /*
6368          * Since this string is allocated at mount time, and held until the
6369          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6370          * about a memory-reclaim deadlock.
6371          */
6372         str = kmalloc(len, GFP_KERNEL);
6373         if (!str)
6374                 return -ENOMEM;
6375
6376         if (buflen)
6377                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6378                           clp->rpc_ops->version, clp->cl_minorversion,
6379                           buf, clp->cl_rpcclient->cl_nodename);
6380         else
6381                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6382                           clp->rpc_ops->version, clp->cl_minorversion,
6383                           clp->cl_rpcclient->cl_nodename);
6384         clp->cl_owner_id = str;
6385         return 0;
6386 }
6387
6388 /*
6389  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6390  * services.  Advertise one based on the address family of the
6391  * clientaddr.
6392  */
6393 static unsigned int
6394 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6395 {
6396         if (strchr(clp->cl_ipaddr, ':') != NULL)
6397                 return scnprintf(buf, len, "tcp6");
6398         else
6399                 return scnprintf(buf, len, "tcp");
6400 }
6401
6402 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6403 {
6404         struct nfs4_setclientid *sc = calldata;
6405
6406         if (task->tk_status == 0)
6407                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6408 }
6409
6410 static const struct rpc_call_ops nfs4_setclientid_ops = {
6411         .rpc_call_done = nfs4_setclientid_done,
6412 };
6413
6414 /**
6415  * nfs4_proc_setclientid - Negotiate client ID
6416  * @clp: state data structure
6417  * @program: RPC program for NFSv4 callback service
6418  * @port: IP port number for NFS4 callback service
6419  * @cred: credential to use for this call
6420  * @res: where to place the result
6421  *
6422  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6423  */
6424 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6425                 unsigned short port, const struct cred *cred,
6426                 struct nfs4_setclientid_res *res)
6427 {
6428         nfs4_verifier sc_verifier;
6429         struct nfs4_setclientid setclientid = {
6430                 .sc_verifier = &sc_verifier,
6431                 .sc_prog = program,
6432                 .sc_clnt = clp,
6433         };
6434         struct rpc_message msg = {
6435                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6436                 .rpc_argp = &setclientid,
6437                 .rpc_resp = res,
6438                 .rpc_cred = cred,
6439         };
6440         struct rpc_task_setup task_setup_data = {
6441                 .rpc_client = clp->cl_rpcclient,
6442                 .rpc_message = &msg,
6443                 .callback_ops = &nfs4_setclientid_ops,
6444                 .callback_data = &setclientid,
6445                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6446         };
6447         unsigned long now = jiffies;
6448         int status;
6449
6450         /* nfs_client_id4 */
6451         nfs4_init_boot_verifier(clp, &sc_verifier);
6452
6453         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6454                 status = nfs4_init_uniform_client_string(clp);
6455         else
6456                 status = nfs4_init_nonuniform_client_string(clp);
6457
6458         if (status)
6459                 goto out;
6460
6461         /* cb_client4 */
6462         setclientid.sc_netid_len =
6463                                 nfs4_init_callback_netid(clp,
6464                                                 setclientid.sc_netid,
6465                                                 sizeof(setclientid.sc_netid));
6466         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6467                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6468                                 clp->cl_ipaddr, port >> 8, port & 255);
6469
6470         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6471                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6472                 clp->cl_owner_id);
6473
6474         status = nfs4_call_sync_custom(&task_setup_data);
6475         if (setclientid.sc_cred) {
6476                 kfree(clp->cl_acceptor);
6477                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6478                 put_rpccred(setclientid.sc_cred);
6479         }
6480
6481         if (status == 0)
6482                 do_renew_lease(clp, now);
6483 out:
6484         trace_nfs4_setclientid(clp, status);
6485         dprintk("NFS reply setclientid: %d\n", status);
6486         return status;
6487 }
6488
6489 /**
6490  * nfs4_proc_setclientid_confirm - Confirm client ID
6491  * @clp: state data structure
6492  * @arg: result of a previous SETCLIENTID
6493  * @cred: credential to use for this call
6494  *
6495  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6496  */
6497 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6498                 struct nfs4_setclientid_res *arg,
6499                 const struct cred *cred)
6500 {
6501         struct rpc_message msg = {
6502                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6503                 .rpc_argp = arg,
6504                 .rpc_cred = cred,
6505         };
6506         int status;
6507
6508         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6509                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6510                 clp->cl_clientid);
6511         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6512                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6513         trace_nfs4_setclientid_confirm(clp, status);
6514         dprintk("NFS reply setclientid_confirm: %d\n", status);
6515         return status;
6516 }
6517
6518 struct nfs4_delegreturndata {
6519         struct nfs4_delegreturnargs args;
6520         struct nfs4_delegreturnres res;
6521         struct nfs_fh fh;
6522         nfs4_stateid stateid;
6523         unsigned long timestamp;
6524         struct {
6525                 struct nfs4_layoutreturn_args arg;
6526                 struct nfs4_layoutreturn_res res;
6527                 struct nfs4_xdr_opaque_data ld_private;
6528                 u32 roc_barrier;
6529                 bool roc;
6530         } lr;
6531         struct nfs_fattr fattr;
6532         int rpc_status;
6533         struct inode *inode;
6534 };
6535
6536 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6537 {
6538         struct nfs4_delegreturndata *data = calldata;
6539         struct nfs4_exception exception = {
6540                 .inode = data->inode,
6541                 .stateid = &data->stateid,
6542                 .task_is_privileged = data->args.seq_args.sa_privileged,
6543         };
6544
6545         if (!nfs4_sequence_done(task, &data->res.seq_res))
6546                 return;
6547
6548         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6549
6550         /* Handle Layoutreturn errors */
6551         if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6552                           &data->res.lr_ret) == -EAGAIN)
6553                 goto out_restart;
6554
6555         switch (task->tk_status) {
6556         case 0:
6557                 renew_lease(data->res.server, data->timestamp);
6558                 break;
6559         case -NFS4ERR_ADMIN_REVOKED:
6560         case -NFS4ERR_DELEG_REVOKED:
6561         case -NFS4ERR_EXPIRED:
6562                 nfs4_free_revoked_stateid(data->res.server,
6563                                 data->args.stateid,
6564                                 task->tk_msg.rpc_cred);
6565                 fallthrough;
6566         case -NFS4ERR_BAD_STATEID:
6567         case -NFS4ERR_STALE_STATEID:
6568         case -ETIMEDOUT:
6569                 task->tk_status = 0;
6570                 break;
6571         case -NFS4ERR_OLD_STATEID:
6572                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6573                         nfs4_stateid_seqid_inc(&data->stateid);
6574                 if (data->args.bitmask) {
6575                         data->args.bitmask = NULL;
6576                         data->res.fattr = NULL;
6577                 }
6578                 goto out_restart;
6579         case -NFS4ERR_ACCESS:
6580                 if (data->args.bitmask) {
6581                         data->args.bitmask = NULL;
6582                         data->res.fattr = NULL;
6583                         goto out_restart;
6584                 }
6585                 fallthrough;
6586         default:
6587                 task->tk_status = nfs4_async_handle_exception(task,
6588                                 data->res.server, task->tk_status,
6589                                 &exception);
6590                 if (exception.retry)
6591                         goto out_restart;
6592         }
6593         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6594         data->rpc_status = task->tk_status;
6595         return;
6596 out_restart:
6597         task->tk_status = 0;
6598         rpc_restart_call_prepare(task);
6599 }
6600
6601 static void nfs4_delegreturn_release(void *calldata)
6602 {
6603         struct nfs4_delegreturndata *data = calldata;
6604         struct inode *inode = data->inode;
6605
6606         if (data->lr.roc)
6607                 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6608                                  data->res.lr_ret);
6609         if (inode) {
6610                 nfs4_fattr_set_prechange(&data->fattr,
6611                                          inode_peek_iversion_raw(inode));
6612                 nfs_refresh_inode(inode, &data->fattr);
6613                 nfs_iput_and_deactive(inode);
6614         }
6615         kfree(calldata);
6616 }
6617
6618 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6619 {
6620         struct nfs4_delegreturndata *d_data;
6621         struct pnfs_layout_hdr *lo;
6622
6623         d_data = data;
6624
6625         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6626                 nfs4_sequence_done(task, &d_data->res.seq_res);
6627                 return;
6628         }
6629
6630         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6631         if (lo && !pnfs_layout_is_valid(lo)) {
6632                 d_data->args.lr_args = NULL;
6633                 d_data->res.lr_res = NULL;
6634         }
6635
6636         nfs4_setup_sequence(d_data->res.server->nfs_client,
6637                         &d_data->args.seq_args,
6638                         &d_data->res.seq_res,
6639                         task);
6640 }
6641
6642 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6643         .rpc_call_prepare = nfs4_delegreturn_prepare,
6644         .rpc_call_done = nfs4_delegreturn_done,
6645         .rpc_release = nfs4_delegreturn_release,
6646 };
6647
6648 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6649 {
6650         struct nfs4_delegreturndata *data;
6651         struct nfs_server *server = NFS_SERVER(inode);
6652         struct rpc_task *task;
6653         struct rpc_message msg = {
6654                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6655                 .rpc_cred = cred,
6656         };
6657         struct rpc_task_setup task_setup_data = {
6658                 .rpc_client = server->client,
6659                 .rpc_message = &msg,
6660                 .callback_ops = &nfs4_delegreturn_ops,
6661                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6662         };
6663         int status = 0;
6664
6665         if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6666                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6667
6668         data = kzalloc(sizeof(*data), GFP_KERNEL);
6669         if (data == NULL)
6670                 return -ENOMEM;
6671
6672         nfs4_state_protect(server->nfs_client,
6673                         NFS_SP4_MACH_CRED_CLEANUP,
6674                         &task_setup_data.rpc_client, &msg);
6675
6676         data->args.fhandle = &data->fh;
6677         data->args.stateid = &data->stateid;
6678         nfs4_bitmask_set(data->args.bitmask_store,
6679                          server->cache_consistency_bitmask, inode, 0);
6680         data->args.bitmask = data->args.bitmask_store;
6681         nfs_copy_fh(&data->fh, NFS_FH(inode));
6682         nfs4_stateid_copy(&data->stateid, stateid);
6683         data->res.fattr = &data->fattr;
6684         data->res.server = server;
6685         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6686         data->lr.arg.ld_private = &data->lr.ld_private;
6687         nfs_fattr_init(data->res.fattr);
6688         data->timestamp = jiffies;
6689         data->rpc_status = 0;
6690         data->inode = nfs_igrab_and_active(inode);
6691         if (data->inode || issync) {
6692                 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6693                                         cred);
6694                 if (data->lr.roc) {
6695                         data->args.lr_args = &data->lr.arg;
6696                         data->res.lr_res = &data->lr.res;
6697                 }
6698         }
6699
6700         if (!data->inode)
6701                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6702                                    1);
6703         else
6704                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6705                                    0);
6706         task_setup_data.callback_data = data;
6707         msg.rpc_argp = &data->args;
6708         msg.rpc_resp = &data->res;
6709         task = rpc_run_task(&task_setup_data);
6710         if (IS_ERR(task))
6711                 return PTR_ERR(task);
6712         if (!issync)
6713                 goto out;
6714         status = rpc_wait_for_completion_task(task);
6715         if (status != 0)
6716                 goto out;
6717         status = data->rpc_status;
6718 out:
6719         rpc_put_task(task);
6720         return status;
6721 }
6722
6723 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6724 {
6725         struct nfs_server *server = NFS_SERVER(inode);
6726         struct nfs4_exception exception = { };
6727         int err;
6728         do {
6729                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6730                 trace_nfs4_delegreturn(inode, stateid, err);
6731                 switch (err) {
6732                         case -NFS4ERR_STALE_STATEID:
6733                         case -NFS4ERR_EXPIRED:
6734                         case 0:
6735                                 return 0;
6736                 }
6737                 err = nfs4_handle_exception(server, err, &exception);
6738         } while (exception.retry);
6739         return err;
6740 }
6741
6742 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6743 {
6744         struct inode *inode = state->inode;
6745         struct nfs_server *server = NFS_SERVER(inode);
6746         struct nfs_client *clp = server->nfs_client;
6747         struct nfs_lockt_args arg = {
6748                 .fh = NFS_FH(inode),
6749                 .fl = request,
6750         };
6751         struct nfs_lockt_res res = {
6752                 .denied = request,
6753         };
6754         struct rpc_message msg = {
6755                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6756                 .rpc_argp       = &arg,
6757                 .rpc_resp       = &res,
6758                 .rpc_cred       = state->owner->so_cred,
6759         };
6760         struct nfs4_lock_state *lsp;
6761         int status;
6762
6763         arg.lock_owner.clientid = clp->cl_clientid;
6764         status = nfs4_set_lock_state(state, request);
6765         if (status != 0)
6766                 goto out;
6767         lsp = request->fl_u.nfs4_fl.owner;
6768         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6769         arg.lock_owner.s_dev = server->s_dev;
6770         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6771         switch (status) {
6772                 case 0:
6773                         request->fl_type = F_UNLCK;
6774                         break;
6775                 case -NFS4ERR_DENIED:
6776                         status = 0;
6777         }
6778         request->fl_ops->fl_release_private(request);
6779         request->fl_ops = NULL;
6780 out:
6781         return status;
6782 }
6783
6784 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6785 {
6786         struct nfs4_exception exception = {
6787                 .interruptible = true,
6788         };
6789         int err;
6790
6791         do {
6792                 err = _nfs4_proc_getlk(state, cmd, request);
6793                 trace_nfs4_get_lock(request, state, cmd, err);
6794                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6795                                 &exception);
6796         } while (exception.retry);
6797         return err;
6798 }
6799
6800 /*
6801  * Update the seqid of a lock stateid after receiving
6802  * NFS4ERR_OLD_STATEID
6803  */
6804 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6805                 struct nfs4_lock_state *lsp)
6806 {
6807         struct nfs4_state *state = lsp->ls_state;
6808         bool ret = false;
6809
6810         spin_lock(&state->state_lock);
6811         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6812                 goto out;
6813         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6814                 nfs4_stateid_seqid_inc(dst);
6815         else
6816                 dst->seqid = lsp->ls_stateid.seqid;
6817         ret = true;
6818 out:
6819         spin_unlock(&state->state_lock);
6820         return ret;
6821 }
6822
6823 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6824                 struct nfs4_lock_state *lsp)
6825 {
6826         struct nfs4_state *state = lsp->ls_state;
6827         bool ret;
6828
6829         spin_lock(&state->state_lock);
6830         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6831         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6832         spin_unlock(&state->state_lock);
6833         return ret;
6834 }
6835
6836 struct nfs4_unlockdata {
6837         struct nfs_locku_args arg;
6838         struct nfs_locku_res res;
6839         struct nfs4_lock_state *lsp;
6840         struct nfs_open_context *ctx;
6841         struct nfs_lock_context *l_ctx;
6842         struct file_lock fl;
6843         struct nfs_server *server;
6844         unsigned long timestamp;
6845 };
6846
6847 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6848                 struct nfs_open_context *ctx,
6849                 struct nfs4_lock_state *lsp,
6850                 struct nfs_seqid *seqid)
6851 {
6852         struct nfs4_unlockdata *p;
6853         struct nfs4_state *state = lsp->ls_state;
6854         struct inode *inode = state->inode;
6855
6856         p = kzalloc(sizeof(*p), GFP_KERNEL);
6857         if (p == NULL)
6858                 return NULL;
6859         p->arg.fh = NFS_FH(inode);
6860         p->arg.fl = &p->fl;
6861         p->arg.seqid = seqid;
6862         p->res.seqid = seqid;
6863         p->lsp = lsp;
6864         /* Ensure we don't close file until we're done freeing locks! */
6865         p->ctx = get_nfs_open_context(ctx);
6866         p->l_ctx = nfs_get_lock_context(ctx);
6867         locks_init_lock(&p->fl);
6868         locks_copy_lock(&p->fl, fl);
6869         p->server = NFS_SERVER(inode);
6870         spin_lock(&state->state_lock);
6871         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6872         spin_unlock(&state->state_lock);
6873         return p;
6874 }
6875
6876 static void nfs4_locku_release_calldata(void *data)
6877 {
6878         struct nfs4_unlockdata *calldata = data;
6879         nfs_free_seqid(calldata->arg.seqid);
6880         nfs4_put_lock_state(calldata->lsp);
6881         nfs_put_lock_context(calldata->l_ctx);
6882         put_nfs_open_context(calldata->ctx);
6883         kfree(calldata);
6884 }
6885
6886 static void nfs4_locku_done(struct rpc_task *task, void *data)
6887 {
6888         struct nfs4_unlockdata *calldata = data;
6889         struct nfs4_exception exception = {
6890                 .inode = calldata->lsp->ls_state->inode,
6891                 .stateid = &calldata->arg.stateid,
6892         };
6893
6894         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6895                 return;
6896         switch (task->tk_status) {
6897                 case 0:
6898                         renew_lease(calldata->server, calldata->timestamp);
6899                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6900                         if (nfs4_update_lock_stateid(calldata->lsp,
6901                                         &calldata->res.stateid))
6902                                 break;
6903                         fallthrough;
6904                 case -NFS4ERR_ADMIN_REVOKED:
6905                 case -NFS4ERR_EXPIRED:
6906                         nfs4_free_revoked_stateid(calldata->server,
6907                                         &calldata->arg.stateid,
6908                                         task->tk_msg.rpc_cred);
6909                         fallthrough;
6910                 case -NFS4ERR_BAD_STATEID:
6911                 case -NFS4ERR_STALE_STATEID:
6912                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6913                                                 calldata->lsp))
6914                                 rpc_restart_call_prepare(task);
6915                         break;
6916                 case -NFS4ERR_OLD_STATEID:
6917                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6918                                                 calldata->lsp))
6919                                 rpc_restart_call_prepare(task);
6920                         break;
6921                 default:
6922                         task->tk_status = nfs4_async_handle_exception(task,
6923                                         calldata->server, task->tk_status,
6924                                         &exception);
6925                         if (exception.retry)
6926                                 rpc_restart_call_prepare(task);
6927         }
6928         nfs_release_seqid(calldata->arg.seqid);
6929 }
6930
6931 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6932 {
6933         struct nfs4_unlockdata *calldata = data;
6934
6935         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6936                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6937                 return;
6938
6939         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6940                 goto out_wait;
6941         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6942                 /* Note: exit _without_ running nfs4_locku_done */
6943                 goto out_no_action;
6944         }
6945         calldata->timestamp = jiffies;
6946         if (nfs4_setup_sequence(calldata->server->nfs_client,
6947                                 &calldata->arg.seq_args,
6948                                 &calldata->res.seq_res,
6949                                 task) != 0)
6950                 nfs_release_seqid(calldata->arg.seqid);
6951         return;
6952 out_no_action:
6953         task->tk_action = NULL;
6954 out_wait:
6955         nfs4_sequence_done(task, &calldata->res.seq_res);
6956 }
6957
6958 static const struct rpc_call_ops nfs4_locku_ops = {
6959         .rpc_call_prepare = nfs4_locku_prepare,
6960         .rpc_call_done = nfs4_locku_done,
6961         .rpc_release = nfs4_locku_release_calldata,
6962 };
6963
6964 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6965                 struct nfs_open_context *ctx,
6966                 struct nfs4_lock_state *lsp,
6967                 struct nfs_seqid *seqid)
6968 {
6969         struct nfs4_unlockdata *data;
6970         struct rpc_message msg = {
6971                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6972                 .rpc_cred = ctx->cred,
6973         };
6974         struct rpc_task_setup task_setup_data = {
6975                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6976                 .rpc_message = &msg,
6977                 .callback_ops = &nfs4_locku_ops,
6978                 .workqueue = nfsiod_workqueue,
6979                 .flags = RPC_TASK_ASYNC,
6980         };
6981
6982         if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
6983                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6984
6985         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6986                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6987
6988         /* Ensure this is an unlock - when canceling a lock, the
6989          * canceled lock is passed in, and it won't be an unlock.
6990          */
6991         fl->fl_type = F_UNLCK;
6992         if (fl->fl_flags & FL_CLOSE)
6993                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6994
6995         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6996         if (data == NULL) {
6997                 nfs_free_seqid(seqid);
6998                 return ERR_PTR(-ENOMEM);
6999         }
7000
7001         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7002         msg.rpc_argp = &data->arg;
7003         msg.rpc_resp = &data->res;
7004         task_setup_data.callback_data = data;
7005         return rpc_run_task(&task_setup_data);
7006 }
7007
7008 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7009 {
7010         struct inode *inode = state->inode;
7011         struct nfs4_state_owner *sp = state->owner;
7012         struct nfs_inode *nfsi = NFS_I(inode);
7013         struct nfs_seqid *seqid;
7014         struct nfs4_lock_state *lsp;
7015         struct rpc_task *task;
7016         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7017         int status = 0;
7018         unsigned char fl_flags = request->fl_flags;
7019
7020         status = nfs4_set_lock_state(state, request);
7021         /* Unlock _before_ we do the RPC call */
7022         request->fl_flags |= FL_EXISTS;
7023         /* Exclude nfs_delegation_claim_locks() */
7024         mutex_lock(&sp->so_delegreturn_mutex);
7025         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7026         down_read(&nfsi->rwsem);
7027         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7028                 up_read(&nfsi->rwsem);
7029                 mutex_unlock(&sp->so_delegreturn_mutex);
7030                 goto out;
7031         }
7032         up_read(&nfsi->rwsem);
7033         mutex_unlock(&sp->so_delegreturn_mutex);
7034         if (status != 0)
7035                 goto out;
7036         /* Is this a delegated lock? */
7037         lsp = request->fl_u.nfs4_fl.owner;
7038         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7039                 goto out;
7040         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7041         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7042         status = -ENOMEM;
7043         if (IS_ERR(seqid))
7044                 goto out;
7045         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
7046         status = PTR_ERR(task);
7047         if (IS_ERR(task))
7048                 goto out;
7049         status = rpc_wait_for_completion_task(task);
7050         rpc_put_task(task);
7051 out:
7052         request->fl_flags = fl_flags;
7053         trace_nfs4_unlock(request, state, F_SETLK, status);
7054         return status;
7055 }
7056
7057 struct nfs4_lockdata {
7058         struct nfs_lock_args arg;
7059         struct nfs_lock_res res;
7060         struct nfs4_lock_state *lsp;
7061         struct nfs_open_context *ctx;
7062         struct file_lock fl;
7063         unsigned long timestamp;
7064         int rpc_status;
7065         int cancelled;
7066         struct nfs_server *server;
7067 };
7068
7069 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7070                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7071                 gfp_t gfp_mask)
7072 {
7073         struct nfs4_lockdata *p;
7074         struct inode *inode = lsp->ls_state->inode;
7075         struct nfs_server *server = NFS_SERVER(inode);
7076         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7077
7078         p = kzalloc(sizeof(*p), gfp_mask);
7079         if (p == NULL)
7080                 return NULL;
7081
7082         p->arg.fh = NFS_FH(inode);
7083         p->arg.fl = &p->fl;
7084         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7085         if (IS_ERR(p->arg.open_seqid))
7086                 goto out_free;
7087         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7088         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7089         if (IS_ERR(p->arg.lock_seqid))
7090                 goto out_free_seqid;
7091         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7092         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7093         p->arg.lock_owner.s_dev = server->s_dev;
7094         p->res.lock_seqid = p->arg.lock_seqid;
7095         p->lsp = lsp;
7096         p->server = server;
7097         p->ctx = get_nfs_open_context(ctx);
7098         locks_init_lock(&p->fl);
7099         locks_copy_lock(&p->fl, fl);
7100         return p;
7101 out_free_seqid:
7102         nfs_free_seqid(p->arg.open_seqid);
7103 out_free:
7104         kfree(p);
7105         return NULL;
7106 }
7107
7108 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7109 {
7110         struct nfs4_lockdata *data = calldata;
7111         struct nfs4_state *state = data->lsp->ls_state;
7112
7113         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7114                 goto out_wait;
7115         /* Do we need to do an open_to_lock_owner? */
7116         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7117                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7118                         goto out_release_lock_seqid;
7119                 }
7120                 nfs4_stateid_copy(&data->arg.open_stateid,
7121                                 &state->open_stateid);
7122                 data->arg.new_lock_owner = 1;
7123                 data->res.open_seqid = data->arg.open_seqid;
7124         } else {
7125                 data->arg.new_lock_owner = 0;
7126                 nfs4_stateid_copy(&data->arg.lock_stateid,
7127                                 &data->lsp->ls_stateid);
7128         }
7129         if (!nfs4_valid_open_stateid(state)) {
7130                 data->rpc_status = -EBADF;
7131                 task->tk_action = NULL;
7132                 goto out_release_open_seqid;
7133         }
7134         data->timestamp = jiffies;
7135         if (nfs4_setup_sequence(data->server->nfs_client,
7136                                 &data->arg.seq_args,
7137                                 &data->res.seq_res,
7138                                 task) == 0)
7139                 return;
7140 out_release_open_seqid:
7141         nfs_release_seqid(data->arg.open_seqid);
7142 out_release_lock_seqid:
7143         nfs_release_seqid(data->arg.lock_seqid);
7144 out_wait:
7145         nfs4_sequence_done(task, &data->res.seq_res);
7146         dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7147 }
7148
7149 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7150 {
7151         struct nfs4_lockdata *data = calldata;
7152         struct nfs4_lock_state *lsp = data->lsp;
7153         struct nfs_server *server = NFS_SERVER(d_inode(data->ctx->dentry));
7154
7155         if (!nfs4_sequence_done(task, &data->res.seq_res))
7156                 return;
7157
7158         data->rpc_status = task->tk_status;
7159         switch (task->tk_status) {
7160         case 0:
7161                 renew_lease(server, data->timestamp);
7162                 if (data->arg.new_lock && !data->cancelled) {
7163                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7164                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7165                                 goto out_restart;
7166                 }
7167                 if (data->arg.new_lock_owner != 0) {
7168                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
7169                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7170                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7171                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7172                         goto out_restart;
7173                 break;
7174         case -NFS4ERR_BAD_STATEID:
7175         case -NFS4ERR_OLD_STATEID:
7176         case -NFS4ERR_STALE_STATEID:
7177         case -NFS4ERR_EXPIRED:
7178                 if (data->arg.new_lock_owner != 0) {
7179                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7180                                                 &lsp->ls_state->open_stateid))
7181                                 goto out_restart;
7182                         else if (nfs4_async_handle_error(task, server, lsp->ls_state, NULL) == -EAGAIN)
7183                                 goto out_restart;
7184                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7185                                                 &lsp->ls_stateid))
7186                                 goto out_restart;
7187         }
7188 out_done:
7189         dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7190         return;
7191 out_restart:
7192         if (!data->cancelled)
7193                 rpc_restart_call_prepare(task);
7194         goto out_done;
7195 }
7196
7197 static void nfs4_lock_release(void *calldata)
7198 {
7199         struct nfs4_lockdata *data = calldata;
7200
7201         nfs_free_seqid(data->arg.open_seqid);
7202         if (data->cancelled && data->rpc_status == 0) {
7203                 struct rpc_task *task;
7204                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7205                                 data->arg.lock_seqid);
7206                 if (!IS_ERR(task))
7207                         rpc_put_task_async(task);
7208                 dprintk("%s: cancelling lock!\n", __func__);
7209         } else
7210                 nfs_free_seqid(data->arg.lock_seqid);
7211         nfs4_put_lock_state(data->lsp);
7212         put_nfs_open_context(data->ctx);
7213         kfree(data);
7214 }
7215
7216 static const struct rpc_call_ops nfs4_lock_ops = {
7217         .rpc_call_prepare = nfs4_lock_prepare,
7218         .rpc_call_done = nfs4_lock_done,
7219         .rpc_release = nfs4_lock_release,
7220 };
7221
7222 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7223 {
7224         switch (error) {
7225         case -NFS4ERR_ADMIN_REVOKED:
7226         case -NFS4ERR_EXPIRED:
7227         case -NFS4ERR_BAD_STATEID:
7228                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7229                 if (new_lock_owner != 0 ||
7230                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7231                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7232                 break;
7233         case -NFS4ERR_STALE_STATEID:
7234                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7235                 nfs4_schedule_lease_recovery(server->nfs_client);
7236         }
7237 }
7238
7239 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7240 {
7241         struct nfs4_lockdata *data;
7242         struct rpc_task *task;
7243         struct rpc_message msg = {
7244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7245                 .rpc_cred = state->owner->so_cred,
7246         };
7247         struct rpc_task_setup task_setup_data = {
7248                 .rpc_client = NFS_CLIENT(state->inode),
7249                 .rpc_message = &msg,
7250                 .callback_ops = &nfs4_lock_ops,
7251                 .workqueue = nfsiod_workqueue,
7252                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7253         };
7254         int ret;
7255
7256         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7257                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7258
7259         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7260                                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7261         if (data == NULL)
7262                 return -ENOMEM;
7263         if (IS_SETLKW(cmd))
7264                 data->arg.block = 1;
7265         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7266                                 recovery_type > NFS_LOCK_NEW);
7267         msg.rpc_argp = &data->arg;
7268         msg.rpc_resp = &data->res;
7269         task_setup_data.callback_data = data;
7270         if (recovery_type > NFS_LOCK_NEW) {
7271                 if (recovery_type == NFS_LOCK_RECLAIM)
7272                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7273         } else
7274                 data->arg.new_lock = 1;
7275         task = rpc_run_task(&task_setup_data);
7276         if (IS_ERR(task))
7277                 return PTR_ERR(task);
7278         ret = rpc_wait_for_completion_task(task);
7279         if (ret == 0) {
7280                 ret = data->rpc_status;
7281                 if (ret)
7282                         nfs4_handle_setlk_error(data->server, data->lsp,
7283                                         data->arg.new_lock_owner, ret);
7284         } else
7285                 data->cancelled = true;
7286         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7287         rpc_put_task(task);
7288         dprintk("%s: ret = %d\n", __func__, ret);
7289         return ret;
7290 }
7291
7292 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7293 {
7294         struct nfs_server *server = NFS_SERVER(state->inode);
7295         struct nfs4_exception exception = {
7296                 .inode = state->inode,
7297         };
7298         int err;
7299
7300         do {
7301                 /* Cache the lock if possible... */
7302                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7303                         return 0;
7304                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7305                 if (err != -NFS4ERR_DELAY)
7306                         break;
7307                 nfs4_handle_exception(server, err, &exception);
7308         } while (exception.retry);
7309         return err;
7310 }
7311
7312 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7313 {
7314         struct nfs_server *server = NFS_SERVER(state->inode);
7315         struct nfs4_exception exception = {
7316                 .inode = state->inode,
7317         };
7318         int err;
7319
7320         err = nfs4_set_lock_state(state, request);
7321         if (err != 0)
7322                 return err;
7323         if (!recover_lost_locks) {
7324                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7325                 return 0;
7326         }
7327         do {
7328                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7329                         return 0;
7330                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7331                 switch (err) {
7332                 default:
7333                         goto out;
7334                 case -NFS4ERR_GRACE:
7335                 case -NFS4ERR_DELAY:
7336                         nfs4_handle_exception(server, err, &exception);
7337                         err = 0;
7338                 }
7339         } while (exception.retry);
7340 out:
7341         return err;
7342 }
7343
7344 #if defined(CONFIG_NFS_V4_1)
7345 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7346 {
7347         struct nfs4_lock_state *lsp;
7348         int status;
7349
7350         status = nfs4_set_lock_state(state, request);
7351         if (status != 0)
7352                 return status;
7353         lsp = request->fl_u.nfs4_fl.owner;
7354         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7355             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7356                 return 0;
7357         return nfs4_lock_expired(state, request);
7358 }
7359 #endif
7360
7361 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7362 {
7363         struct nfs_inode *nfsi = NFS_I(state->inode);
7364         struct nfs4_state_owner *sp = state->owner;
7365         unsigned char fl_flags = request->fl_flags;
7366         int status;
7367
7368         request->fl_flags |= FL_ACCESS;
7369         status = locks_lock_inode_wait(state->inode, request);
7370         if (status < 0)
7371                 goto out;
7372         mutex_lock(&sp->so_delegreturn_mutex);
7373         down_read(&nfsi->rwsem);
7374         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7375                 /* Yes: cache locks! */
7376                 /* ...but avoid races with delegation recall... */
7377                 request->fl_flags = fl_flags & ~FL_SLEEP;
7378                 status = locks_lock_inode_wait(state->inode, request);
7379                 up_read(&nfsi->rwsem);
7380                 mutex_unlock(&sp->so_delegreturn_mutex);
7381                 goto out;
7382         }
7383         up_read(&nfsi->rwsem);
7384         mutex_unlock(&sp->so_delegreturn_mutex);
7385         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7386 out:
7387         request->fl_flags = fl_flags;
7388         return status;
7389 }
7390
7391 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7392 {
7393         struct nfs4_exception exception = {
7394                 .state = state,
7395                 .inode = state->inode,
7396                 .interruptible = true,
7397         };
7398         int err;
7399
7400         do {
7401                 err = _nfs4_proc_setlk(state, cmd, request);
7402                 if (err == -NFS4ERR_DENIED)
7403                         err = -EAGAIN;
7404                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7405                                 err, &exception);
7406         } while (exception.retry);
7407         return err;
7408 }
7409
7410 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7411 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7412
7413 static int
7414 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7415                         struct file_lock *request)
7416 {
7417         int             status = -ERESTARTSYS;
7418         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7419
7420         while(!signalled()) {
7421                 status = nfs4_proc_setlk(state, cmd, request);
7422                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7423                         break;
7424                 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7425                 schedule_timeout(timeout);
7426                 timeout *= 2;
7427                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7428                 status = -ERESTARTSYS;
7429         }
7430         return status;
7431 }
7432
7433 #ifdef CONFIG_NFS_V4_1
7434 struct nfs4_lock_waiter {
7435         struct inode            *inode;
7436         struct nfs_lowner       owner;
7437         wait_queue_entry_t      wait;
7438 };
7439
7440 static int
7441 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7442 {
7443         struct nfs4_lock_waiter *waiter =
7444                 container_of(wait, struct nfs4_lock_waiter, wait);
7445
7446         /* NULL key means to wake up everyone */
7447         if (key) {
7448                 struct cb_notify_lock_args      *cbnl = key;
7449                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7450                                                 *wowner = &waiter->owner;
7451
7452                 /* Only wake if the callback was for the same owner. */
7453                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7454                         return 0;
7455
7456                 /* Make sure it's for the right inode */
7457                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7458                         return 0;
7459         }
7460
7461         return woken_wake_function(wait, mode, flags, key);
7462 }
7463
7464 static int
7465 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7466 {
7467         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7468         struct nfs_server *server = NFS_SERVER(state->inode);
7469         struct nfs_client *clp = server->nfs_client;
7470         wait_queue_head_t *q = &clp->cl_lock_waitq;
7471         struct nfs4_lock_waiter waiter = {
7472                 .inode = state->inode,
7473                 .owner = { .clientid = clp->cl_clientid,
7474                            .id = lsp->ls_seqid.owner_id,
7475                            .s_dev = server->s_dev },
7476         };
7477         int status;
7478
7479         /* Don't bother with waitqueue if we don't expect a callback */
7480         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7481                 return nfs4_retry_setlk_simple(state, cmd, request);
7482
7483         init_wait(&waiter.wait);
7484         waiter.wait.func = nfs4_wake_lock_waiter;
7485         add_wait_queue(q, &waiter.wait);
7486
7487         do {
7488                 status = nfs4_proc_setlk(state, cmd, request);
7489                 if (status != -EAGAIN || IS_SETLK(cmd))
7490                         break;
7491
7492                 status = -ERESTARTSYS;
7493                 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7494                            NFS4_LOCK_MAXTIMEOUT);
7495         } while (!signalled());
7496
7497         remove_wait_queue(q, &waiter.wait);
7498
7499         return status;
7500 }
7501 #else /* !CONFIG_NFS_V4_1 */
7502 static inline int
7503 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7504 {
7505         return nfs4_retry_setlk_simple(state, cmd, request);
7506 }
7507 #endif
7508
7509 static int
7510 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7511 {
7512         struct nfs_open_context *ctx;
7513         struct nfs4_state *state;
7514         int status;
7515
7516         /* verify open state */
7517         ctx = nfs_file_open_context(filp);
7518         state = ctx->state;
7519
7520         if (IS_GETLK(cmd)) {
7521                 if (state != NULL)
7522                         return nfs4_proc_getlk(state, F_GETLK, request);
7523                 return 0;
7524         }
7525
7526         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7527                 return -EINVAL;
7528
7529         if (request->fl_type == F_UNLCK) {
7530                 if (state != NULL)
7531                         return nfs4_proc_unlck(state, cmd, request);
7532                 return 0;
7533         }
7534
7535         if (state == NULL)
7536                 return -ENOLCK;
7537
7538         if ((request->fl_flags & FL_POSIX) &&
7539             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7540                 return -ENOLCK;
7541
7542         /*
7543          * Don't rely on the VFS having checked the file open mode,
7544          * since it won't do this for flock() locks.
7545          */
7546         switch (request->fl_type) {
7547         case F_RDLCK:
7548                 if (!(filp->f_mode & FMODE_READ))
7549                         return -EBADF;
7550                 break;
7551         case F_WRLCK:
7552                 if (!(filp->f_mode & FMODE_WRITE))
7553                         return -EBADF;
7554         }
7555
7556         status = nfs4_set_lock_state(state, request);
7557         if (status != 0)
7558                 return status;
7559
7560         return nfs4_retry_setlk(state, cmd, request);
7561 }
7562
7563 static int nfs4_delete_lease(struct file *file, void **priv)
7564 {
7565         return generic_setlease(file, F_UNLCK, NULL, priv);
7566 }
7567
7568 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease,
7569                           void **priv)
7570 {
7571         struct inode *inode = file_inode(file);
7572         fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7573         int ret;
7574
7575         /* No delegation, no lease */
7576         if (!nfs4_have_delegation(inode, type))
7577                 return -EAGAIN;
7578         ret = generic_setlease(file, arg, lease, priv);
7579         if (ret || nfs4_have_delegation(inode, type))
7580                 return ret;
7581         /* We raced with a delegation return */
7582         nfs4_delete_lease(file, priv);
7583         return -EAGAIN;
7584 }
7585
7586 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease,
7587                        void **priv)
7588 {
7589         switch (arg) {
7590         case F_RDLCK:
7591         case F_WRLCK:
7592                 return nfs4_add_lease(file, arg, lease, priv);
7593         case F_UNLCK:
7594                 return nfs4_delete_lease(file, priv);
7595         default:
7596                 return -EINVAL;
7597         }
7598 }
7599
7600 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7601 {
7602         struct nfs_server *server = NFS_SERVER(state->inode);
7603         int err;
7604
7605         err = nfs4_set_lock_state(state, fl);
7606         if (err != 0)
7607                 return err;
7608         do {
7609                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7610                 if (err != -NFS4ERR_DELAY)
7611                         break;
7612                 ssleep(1);
7613         } while (err == -NFS4ERR_DELAY);
7614         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7615 }
7616
7617 struct nfs_release_lockowner_data {
7618         struct nfs4_lock_state *lsp;
7619         struct nfs_server *server;
7620         struct nfs_release_lockowner_args args;
7621         struct nfs_release_lockowner_res res;
7622         unsigned long timestamp;
7623 };
7624
7625 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7626 {
7627         struct nfs_release_lockowner_data *data = calldata;
7628         struct nfs_server *server = data->server;
7629         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7630                            &data->res.seq_res, task);
7631         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7632         data->timestamp = jiffies;
7633 }
7634
7635 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7636 {
7637         struct nfs_release_lockowner_data *data = calldata;
7638         struct nfs_server *server = data->server;
7639
7640         nfs40_sequence_done(task, &data->res.seq_res);
7641
7642         switch (task->tk_status) {
7643         case 0:
7644                 renew_lease(server, data->timestamp);
7645                 break;
7646         case -NFS4ERR_STALE_CLIENTID:
7647         case -NFS4ERR_EXPIRED:
7648                 nfs4_schedule_lease_recovery(server->nfs_client);
7649                 break;
7650         case -NFS4ERR_LEASE_MOVED:
7651         case -NFS4ERR_DELAY:
7652                 if (nfs4_async_handle_error(task, server,
7653                                             NULL, NULL) == -EAGAIN)
7654                         rpc_restart_call_prepare(task);
7655         }
7656 }
7657
7658 static void nfs4_release_lockowner_release(void *calldata)
7659 {
7660         struct nfs_release_lockowner_data *data = calldata;
7661         nfs4_free_lock_state(data->server, data->lsp);
7662         kfree(calldata);
7663 }
7664
7665 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7666         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7667         .rpc_call_done = nfs4_release_lockowner_done,
7668         .rpc_release = nfs4_release_lockowner_release,
7669 };
7670
7671 static void
7672 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7673 {
7674         struct nfs_release_lockowner_data *data;
7675         struct rpc_message msg = {
7676                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7677         };
7678
7679         if (server->nfs_client->cl_mvops->minor_version != 0)
7680                 return;
7681
7682         data = kmalloc(sizeof(*data), GFP_KERNEL);
7683         if (!data)
7684                 return;
7685         data->lsp = lsp;
7686         data->server = server;
7687         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7688         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7689         data->args.lock_owner.s_dev = server->s_dev;
7690
7691         msg.rpc_argp = &data->args;
7692         msg.rpc_resp = &data->res;
7693         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7694         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7695 }
7696
7697 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7698
7699 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7700                                    struct user_namespace *mnt_userns,
7701                                    struct dentry *unused, struct inode *inode,
7702                                    const char *key, const void *buf,
7703                                    size_t buflen, int flags)
7704 {
7705         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7706 }
7707
7708 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7709                                    struct dentry *unused, struct inode *inode,
7710                                    const char *key, void *buf, size_t buflen)
7711 {
7712         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7713 }
7714
7715 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7716 {
7717         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7718 }
7719
7720 #if defined(CONFIG_NFS_V4_1)
7721 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7722
7723 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7724                                     struct user_namespace *mnt_userns,
7725                                     struct dentry *unused, struct inode *inode,
7726                                     const char *key, const void *buf,
7727                                     size_t buflen, int flags)
7728 {
7729         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7730 }
7731
7732 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7733                                     struct dentry *unused, struct inode *inode,
7734                                     const char *key, void *buf, size_t buflen)
7735 {
7736         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7737 }
7738
7739 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7740 {
7741         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7742 }
7743
7744 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7745
7746 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7747                                     struct user_namespace *mnt_userns,
7748                                     struct dentry *unused, struct inode *inode,
7749                                     const char *key, const void *buf,
7750                                     size_t buflen, int flags)
7751 {
7752         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7753 }
7754
7755 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7756                                     struct dentry *unused, struct inode *inode,
7757                                     const char *key, void *buf, size_t buflen)
7758 {
7759         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7760 }
7761
7762 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7763 {
7764         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7765 }
7766
7767 #endif
7768
7769 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7770
7771 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7772                                      struct user_namespace *mnt_userns,
7773                                      struct dentry *unused, struct inode *inode,
7774                                      const char *key, const void *buf,
7775                                      size_t buflen, int flags)
7776 {
7777         if (security_ismaclabel(key))
7778                 return nfs4_set_security_label(inode, buf, buflen);
7779
7780         return -EOPNOTSUPP;
7781 }
7782
7783 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7784                                      struct dentry *unused, struct inode *inode,
7785                                      const char *key, void *buf, size_t buflen)
7786 {
7787         if (security_ismaclabel(key))
7788                 return nfs4_get_security_label(inode, buf, buflen);
7789         return -EOPNOTSUPP;
7790 }
7791
7792 static ssize_t
7793 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7794 {
7795         int len = 0;
7796
7797         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7798                 len = security_inode_listsecurity(inode, list, list_len);
7799                 if (len >= 0 && list_len && len > list_len)
7800                         return -ERANGE;
7801         }
7802         return len;
7803 }
7804
7805 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7806         .prefix = XATTR_SECURITY_PREFIX,
7807         .get    = nfs4_xattr_get_nfs4_label,
7808         .set    = nfs4_xattr_set_nfs4_label,
7809 };
7810
7811 #else
7812
7813 static ssize_t
7814 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7815 {
7816         return 0;
7817 }
7818
7819 #endif
7820
7821 #ifdef CONFIG_NFS_V4_2
7822 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7823                                     struct user_namespace *mnt_userns,
7824                                     struct dentry *unused, struct inode *inode,
7825                                     const char *key, const void *buf,
7826                                     size_t buflen, int flags)
7827 {
7828         u32 mask;
7829         int ret;
7830
7831         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7832                 return -EOPNOTSUPP;
7833
7834         /*
7835          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7836          * flags right now. Handling of xattr operations use the normal
7837          * file read/write permissions.
7838          *
7839          * Just in case the server has other ideas (which RFC 8276 allows),
7840          * do a cached access check for the XA* flags to possibly avoid
7841          * doing an RPC and getting EACCES back.
7842          */
7843         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7844                 if (!(mask & NFS_ACCESS_XAWRITE))
7845                         return -EACCES;
7846         }
7847
7848         if (buf == NULL) {
7849                 ret = nfs42_proc_removexattr(inode, key);
7850                 if (!ret)
7851                         nfs4_xattr_cache_remove(inode, key);
7852         } else {
7853                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7854                 if (!ret)
7855                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7856         }
7857
7858         return ret;
7859 }
7860
7861 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7862                                     struct dentry *unused, struct inode *inode,
7863                                     const char *key, void *buf, size_t buflen)
7864 {
7865         u32 mask;
7866         ssize_t ret;
7867
7868         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7869                 return -EOPNOTSUPP;
7870
7871         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7872                 if (!(mask & NFS_ACCESS_XAREAD))
7873                         return -EACCES;
7874         }
7875
7876         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7877         if (ret)
7878                 return ret;
7879
7880         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7881         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7882                 return ret;
7883
7884         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7885
7886         return ret;
7887 }
7888
7889 static ssize_t
7890 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7891 {
7892         u64 cookie;
7893         bool eof;
7894         ssize_t ret, size;
7895         char *buf;
7896         size_t buflen;
7897         u32 mask;
7898
7899         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7900                 return 0;
7901
7902         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7903                 if (!(mask & NFS_ACCESS_XALIST))
7904                         return 0;
7905         }
7906
7907         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7908         if (ret)
7909                 return ret;
7910
7911         ret = nfs4_xattr_cache_list(inode, list, list_len);
7912         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7913                 return ret;
7914
7915         cookie = 0;
7916         eof = false;
7917         buflen = list_len ? list_len : XATTR_LIST_MAX;
7918         buf = list_len ? list : NULL;
7919         size = 0;
7920
7921         while (!eof) {
7922                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7923                     &cookie, &eof);
7924                 if (ret < 0)
7925                         return ret;
7926
7927                 if (list_len) {
7928                         buf += ret;
7929                         buflen -= ret;
7930                 }
7931                 size += ret;
7932         }
7933
7934         if (list_len)
7935                 nfs4_xattr_cache_set_list(inode, list, size);
7936
7937         return size;
7938 }
7939
7940 #else
7941
7942 static ssize_t
7943 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7944 {
7945         return 0;
7946 }
7947 #endif /* CONFIG_NFS_V4_2 */
7948
7949 /*
7950  * nfs_fhget will use either the mounted_on_fileid or the fileid
7951  */
7952 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7953 {
7954         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7955                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7956               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7957               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7958                 return;
7959
7960         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7961                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7962         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7963         fattr->nlink = 2;
7964 }
7965
7966 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7967                                    const struct qstr *name,
7968                                    struct nfs4_fs_locations *fs_locations,
7969                                    struct page *page)
7970 {
7971         struct nfs_server *server = NFS_SERVER(dir);
7972         u32 bitmask[3];
7973         struct nfs4_fs_locations_arg args = {
7974                 .dir_fh = NFS_FH(dir),
7975                 .name = name,
7976                 .page = page,
7977                 .bitmask = bitmask,
7978         };
7979         struct nfs4_fs_locations_res res = {
7980                 .fs_locations = fs_locations,
7981         };
7982         struct rpc_message msg = {
7983                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7984                 .rpc_argp = &args,
7985                 .rpc_resp = &res,
7986         };
7987         int status;
7988
7989         dprintk("%s: start\n", __func__);
7990
7991         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7992         bitmask[1] = nfs4_fattr_bitmap[1];
7993
7994         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7995          * is not supported */
7996         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7997                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7998         else
7999                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8000
8001         nfs_fattr_init(fs_locations->fattr);
8002         fs_locations->server = server;
8003         fs_locations->nlocations = 0;
8004         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8005         dprintk("%s: returned status = %d\n", __func__, status);
8006         return status;
8007 }
8008
8009 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8010                            const struct qstr *name,
8011                            struct nfs4_fs_locations *fs_locations,
8012                            struct page *page)
8013 {
8014         struct nfs4_exception exception = {
8015                 .interruptible = true,
8016         };
8017         int err;
8018         do {
8019                 err = _nfs4_proc_fs_locations(client, dir, name,
8020                                 fs_locations, page);
8021                 trace_nfs4_get_fs_locations(dir, name, err);
8022                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8023                                 &exception);
8024         } while (exception.retry);
8025         return err;
8026 }
8027
8028 /*
8029  * This operation also signals the server that this client is
8030  * performing migration recovery.  The server can stop returning
8031  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8032  * appended to this compound to identify the client ID which is
8033  * performing recovery.
8034  */
8035 static int _nfs40_proc_get_locations(struct nfs_server *server,
8036                                      struct nfs_fh *fhandle,
8037                                      struct nfs4_fs_locations *locations,
8038                                      struct page *page, const struct cred *cred)
8039 {
8040         struct rpc_clnt *clnt = server->client;
8041         u32 bitmask[2] = {
8042                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8043         };
8044         struct nfs4_fs_locations_arg args = {
8045                 .clientid       = server->nfs_client->cl_clientid,
8046                 .fh             = fhandle,
8047                 .page           = page,
8048                 .bitmask        = bitmask,
8049                 .migration      = 1,            /* skip LOOKUP */
8050                 .renew          = 1,            /* append RENEW */
8051         };
8052         struct nfs4_fs_locations_res res = {
8053                 .fs_locations   = locations,
8054                 .migration      = 1,
8055                 .renew          = 1,
8056         };
8057         struct rpc_message msg = {
8058                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8059                 .rpc_argp       = &args,
8060                 .rpc_resp       = &res,
8061                 .rpc_cred       = cred,
8062         };
8063         unsigned long now = jiffies;
8064         int status;
8065
8066         nfs_fattr_init(locations->fattr);
8067         locations->server = server;
8068         locations->nlocations = 0;
8069
8070         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8071         status = nfs4_call_sync_sequence(clnt, server, &msg,
8072                                         &args.seq_args, &res.seq_res);
8073         if (status)
8074                 return status;
8075
8076         renew_lease(server, now);
8077         return 0;
8078 }
8079
8080 #ifdef CONFIG_NFS_V4_1
8081
8082 /*
8083  * This operation also signals the server that this client is
8084  * performing migration recovery.  The server can stop asserting
8085  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8086  * performing this operation is identified in the SEQUENCE
8087  * operation in this compound.
8088  *
8089  * When the client supports GETATTR(fs_locations_info), it can
8090  * be plumbed in here.
8091  */
8092 static int _nfs41_proc_get_locations(struct nfs_server *server,
8093                                      struct nfs_fh *fhandle,
8094                                      struct nfs4_fs_locations *locations,
8095                                      struct page *page, const struct cred *cred)
8096 {
8097         struct rpc_clnt *clnt = server->client;
8098         u32 bitmask[2] = {
8099                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8100         };
8101         struct nfs4_fs_locations_arg args = {
8102                 .fh             = fhandle,
8103                 .page           = page,
8104                 .bitmask        = bitmask,
8105                 .migration      = 1,            /* skip LOOKUP */
8106         };
8107         struct nfs4_fs_locations_res res = {
8108                 .fs_locations   = locations,
8109                 .migration      = 1,
8110         };
8111         struct rpc_message msg = {
8112                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8113                 .rpc_argp       = &args,
8114                 .rpc_resp       = &res,
8115                 .rpc_cred       = cred,
8116         };
8117         struct nfs4_call_sync_data data = {
8118                 .seq_server = server,
8119                 .seq_args = &args.seq_args,
8120                 .seq_res = &res.seq_res,
8121         };
8122         struct rpc_task_setup task_setup_data = {
8123                 .rpc_client = clnt,
8124                 .rpc_message = &msg,
8125                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8126                 .callback_data = &data,
8127                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8128         };
8129         int status;
8130
8131         nfs_fattr_init(locations->fattr);
8132         locations->server = server;
8133         locations->nlocations = 0;
8134
8135         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8136         status = nfs4_call_sync_custom(&task_setup_data);
8137         if (status == NFS4_OK &&
8138             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8139                 status = -NFS4ERR_LEASE_MOVED;
8140         return status;
8141 }
8142
8143 #endif  /* CONFIG_NFS_V4_1 */
8144
8145 /**
8146  * nfs4_proc_get_locations - discover locations for a migrated FSID
8147  * @server: pointer to nfs_server to process
8148  * @fhandle: pointer to the kernel NFS client file handle
8149  * @locations: result of query
8150  * @page: buffer
8151  * @cred: credential to use for this operation
8152  *
8153  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8154  * operation failed, or a negative errno if a local error occurred.
8155  *
8156  * On success, "locations" is filled in, but if the server has
8157  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8158  * asserted.
8159  *
8160  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8161  * from this client that require migration recovery.
8162  */
8163 int nfs4_proc_get_locations(struct nfs_server *server,
8164                             struct nfs_fh *fhandle,
8165                             struct nfs4_fs_locations *locations,
8166                             struct page *page, const struct cred *cred)
8167 {
8168         struct nfs_client *clp = server->nfs_client;
8169         const struct nfs4_mig_recovery_ops *ops =
8170                                         clp->cl_mvops->mig_recovery_ops;
8171         struct nfs4_exception exception = {
8172                 .interruptible = true,
8173         };
8174         int status;
8175
8176         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8177                 (unsigned long long)server->fsid.major,
8178                 (unsigned long long)server->fsid.minor,
8179                 clp->cl_hostname);
8180         nfs_display_fhandle(fhandle, __func__);
8181
8182         do {
8183                 status = ops->get_locations(server, fhandle, locations, page,
8184                                             cred);
8185                 if (status != -NFS4ERR_DELAY)
8186                         break;
8187                 nfs4_handle_exception(server, status, &exception);
8188         } while (exception.retry);
8189         return status;
8190 }
8191
8192 /*
8193  * This operation also signals the server that this client is
8194  * performing "lease moved" recovery.  The server can stop
8195  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8196  * is appended to this compound to identify the client ID which is
8197  * performing recovery.
8198  */
8199 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8200 {
8201         struct nfs_server *server = NFS_SERVER(inode);
8202         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8203         struct rpc_clnt *clnt = server->client;
8204         struct nfs4_fsid_present_arg args = {
8205                 .fh             = NFS_FH(inode),
8206                 .clientid       = clp->cl_clientid,
8207                 .renew          = 1,            /* append RENEW */
8208         };
8209         struct nfs4_fsid_present_res res = {
8210                 .renew          = 1,
8211         };
8212         struct rpc_message msg = {
8213                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8214                 .rpc_argp       = &args,
8215                 .rpc_resp       = &res,
8216                 .rpc_cred       = cred,
8217         };
8218         unsigned long now = jiffies;
8219         int status;
8220
8221         res.fh = nfs_alloc_fhandle();
8222         if (res.fh == NULL)
8223                 return -ENOMEM;
8224
8225         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8226         status = nfs4_call_sync_sequence(clnt, server, &msg,
8227                                                 &args.seq_args, &res.seq_res);
8228         nfs_free_fhandle(res.fh);
8229         if (status)
8230                 return status;
8231
8232         do_renew_lease(clp, now);
8233         return 0;
8234 }
8235
8236 #ifdef CONFIG_NFS_V4_1
8237
8238 /*
8239  * This operation also signals the server that this client is
8240  * performing "lease moved" recovery.  The server can stop asserting
8241  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8242  * this operation is identified in the SEQUENCE operation in this
8243  * compound.
8244  */
8245 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8246 {
8247         struct nfs_server *server = NFS_SERVER(inode);
8248         struct rpc_clnt *clnt = server->client;
8249         struct nfs4_fsid_present_arg args = {
8250                 .fh             = NFS_FH(inode),
8251         };
8252         struct nfs4_fsid_present_res res = {
8253         };
8254         struct rpc_message msg = {
8255                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8256                 .rpc_argp       = &args,
8257                 .rpc_resp       = &res,
8258                 .rpc_cred       = cred,
8259         };
8260         int status;
8261
8262         res.fh = nfs_alloc_fhandle();
8263         if (res.fh == NULL)
8264                 return -ENOMEM;
8265
8266         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8267         status = nfs4_call_sync_sequence(clnt, server, &msg,
8268                                                 &args.seq_args, &res.seq_res);
8269         nfs_free_fhandle(res.fh);
8270         if (status == NFS4_OK &&
8271             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8272                 status = -NFS4ERR_LEASE_MOVED;
8273         return status;
8274 }
8275
8276 #endif  /* CONFIG_NFS_V4_1 */
8277
8278 /**
8279  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8280  * @inode: inode on FSID to check
8281  * @cred: credential to use for this operation
8282  *
8283  * Server indicates whether the FSID is present, moved, or not
8284  * recognized.  This operation is necessary to clear a LEASE_MOVED
8285  * condition for this client ID.
8286  *
8287  * Returns NFS4_OK if the FSID is present on this server,
8288  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8289  *  NFS4ERR code if some error occurred on the server, or a
8290  *  negative errno if a local failure occurred.
8291  */
8292 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8293 {
8294         struct nfs_server *server = NFS_SERVER(inode);
8295         struct nfs_client *clp = server->nfs_client;
8296         const struct nfs4_mig_recovery_ops *ops =
8297                                         clp->cl_mvops->mig_recovery_ops;
8298         struct nfs4_exception exception = {
8299                 .interruptible = true,
8300         };
8301         int status;
8302
8303         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8304                 (unsigned long long)server->fsid.major,
8305                 (unsigned long long)server->fsid.minor,
8306                 clp->cl_hostname);
8307         nfs_display_fhandle(NFS_FH(inode), __func__);
8308
8309         do {
8310                 status = ops->fsid_present(inode, cred);
8311                 if (status != -NFS4ERR_DELAY)
8312                         break;
8313                 nfs4_handle_exception(server, status, &exception);
8314         } while (exception.retry);
8315         return status;
8316 }
8317
8318 /*
8319  * If 'use_integrity' is true and the state managment nfs_client
8320  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8321  * and the machine credential as per RFC3530bis and RFC5661 Security
8322  * Considerations sections. Otherwise, just use the user cred with the
8323  * filesystem's rpc_client.
8324  */
8325 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8326 {
8327         int status;
8328         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8329         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8330         struct nfs4_secinfo_arg args = {
8331                 .dir_fh = NFS_FH(dir),
8332                 .name   = name,
8333         };
8334         struct nfs4_secinfo_res res = {
8335                 .flavors     = flavors,
8336         };
8337         struct rpc_message msg = {
8338                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8339                 .rpc_argp = &args,
8340                 .rpc_resp = &res,
8341         };
8342         struct nfs4_call_sync_data data = {
8343                 .seq_server = NFS_SERVER(dir),
8344                 .seq_args = &args.seq_args,
8345                 .seq_res = &res.seq_res,
8346         };
8347         struct rpc_task_setup task_setup = {
8348                 .rpc_client = clnt,
8349                 .rpc_message = &msg,
8350                 .callback_ops = clp->cl_mvops->call_sync_ops,
8351                 .callback_data = &data,
8352                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8353         };
8354         const struct cred *cred = NULL;
8355
8356         if (use_integrity) {
8357                 clnt = clp->cl_rpcclient;
8358                 task_setup.rpc_client = clnt;
8359
8360                 cred = nfs4_get_clid_cred(clp);
8361                 msg.rpc_cred = cred;
8362         }
8363
8364         dprintk("NFS call  secinfo %s\n", name->name);
8365
8366         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8367         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8368         status = nfs4_call_sync_custom(&task_setup);
8369
8370         dprintk("NFS reply  secinfo: %d\n", status);
8371
8372         put_cred(cred);
8373         return status;
8374 }
8375
8376 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8377                       struct nfs4_secinfo_flavors *flavors)
8378 {
8379         struct nfs4_exception exception = {
8380                 .interruptible = true,
8381         };
8382         int err;
8383         do {
8384                 err = -NFS4ERR_WRONGSEC;
8385
8386                 /* try to use integrity protection with machine cred */
8387                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8388                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8389
8390                 /*
8391                  * if unable to use integrity protection, or SECINFO with
8392                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8393                  * disallowed by spec, but exists in deployed servers) use
8394                  * the current filesystem's rpc_client and the user cred.
8395                  */
8396                 if (err == -NFS4ERR_WRONGSEC)
8397                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8398
8399                 trace_nfs4_secinfo(dir, name, err);
8400                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8401                                 &exception);
8402         } while (exception.retry);
8403         return err;
8404 }
8405
8406 #ifdef CONFIG_NFS_V4_1
8407 /*
8408  * Check the exchange flags returned by the server for invalid flags, having
8409  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8410  * DS flags set.
8411  */
8412 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8413 {
8414         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8415                 goto out_inval;
8416         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8417                 goto out_inval;
8418         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8419             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8420                 goto out_inval;
8421         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8422                 goto out_inval;
8423         return NFS_OK;
8424 out_inval:
8425         return -NFS4ERR_INVAL;
8426 }
8427
8428 static bool
8429 nfs41_same_server_scope(struct nfs41_server_scope *a,
8430                         struct nfs41_server_scope *b)
8431 {
8432         if (a->server_scope_sz != b->server_scope_sz)
8433                 return false;
8434         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8435 }
8436
8437 static void
8438 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8439 {
8440         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8441         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8442         struct nfs_client *clp = args->client;
8443
8444         switch (task->tk_status) {
8445         case -NFS4ERR_BADSESSION:
8446         case -NFS4ERR_DEADSESSION:
8447                 nfs4_schedule_session_recovery(clp->cl_session,
8448                                 task->tk_status);
8449                 return;
8450         }
8451         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8452                         res->dir != NFS4_CDFS4_BOTH) {
8453                 rpc_task_close_connection(task);
8454                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8455                         rpc_restart_call(task);
8456         }
8457 }
8458
8459 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8460         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8461 };
8462
8463 /*
8464  * nfs4_proc_bind_one_conn_to_session()
8465  *
8466  * The 4.1 client currently uses the same TCP connection for the
8467  * fore and backchannel.
8468  */
8469 static
8470 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8471                 struct rpc_xprt *xprt,
8472                 struct nfs_client *clp,
8473                 const struct cred *cred)
8474 {
8475         int status;
8476         struct nfs41_bind_conn_to_session_args args = {
8477                 .client = clp,
8478                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8479                 .retries = 0,
8480         };
8481         struct nfs41_bind_conn_to_session_res res;
8482         struct rpc_message msg = {
8483                 .rpc_proc =
8484                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8485                 .rpc_argp = &args,
8486                 .rpc_resp = &res,
8487                 .rpc_cred = cred,
8488         };
8489         struct rpc_task_setup task_setup_data = {
8490                 .rpc_client = clnt,
8491                 .rpc_xprt = xprt,
8492                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8493                 .rpc_message = &msg,
8494                 .flags = RPC_TASK_TIMEOUT,
8495         };
8496         struct rpc_task *task;
8497
8498         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8499         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8500                 args.dir = NFS4_CDFC4_FORE;
8501
8502         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8503         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8504                 args.dir = NFS4_CDFC4_FORE;
8505
8506         task = rpc_run_task(&task_setup_data);
8507         if (!IS_ERR(task)) {
8508                 status = task->tk_status;
8509                 rpc_put_task(task);
8510         } else
8511                 status = PTR_ERR(task);
8512         trace_nfs4_bind_conn_to_session(clp, status);
8513         if (status == 0) {
8514                 if (memcmp(res.sessionid.data,
8515                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8516                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8517                         return -EIO;
8518                 }
8519                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8520                         dprintk("NFS: %s: Unexpected direction from server\n",
8521                                 __func__);
8522                         return -EIO;
8523                 }
8524                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8525                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8526                                 __func__);
8527                         return -EIO;
8528                 }
8529         }
8530
8531         return status;
8532 }
8533
8534 struct rpc_bind_conn_calldata {
8535         struct nfs_client *clp;
8536         const struct cred *cred;
8537 };
8538
8539 static int
8540 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8541                 struct rpc_xprt *xprt,
8542                 void *calldata)
8543 {
8544         struct rpc_bind_conn_calldata *p = calldata;
8545
8546         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8547 }
8548
8549 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8550 {
8551         struct rpc_bind_conn_calldata data = {
8552                 .clp = clp,
8553                 .cred = cred,
8554         };
8555         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8556                         nfs4_proc_bind_conn_to_session_callback, &data);
8557 }
8558
8559 /*
8560  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8561  * and operations we'd like to see to enable certain features in the allow map
8562  */
8563 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8564         .how = SP4_MACH_CRED,
8565         .enforce.u.words = {
8566                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8567                       1 << (OP_EXCHANGE_ID - 32) |
8568                       1 << (OP_CREATE_SESSION - 32) |
8569                       1 << (OP_DESTROY_SESSION - 32) |
8570                       1 << (OP_DESTROY_CLIENTID - 32)
8571         },
8572         .allow.u.words = {
8573                 [0] = 1 << (OP_CLOSE) |
8574                       1 << (OP_OPEN_DOWNGRADE) |
8575                       1 << (OP_LOCKU) |
8576                       1 << (OP_DELEGRETURN) |
8577                       1 << (OP_COMMIT),
8578                 [1] = 1 << (OP_SECINFO - 32) |
8579                       1 << (OP_SECINFO_NO_NAME - 32) |
8580                       1 << (OP_LAYOUTRETURN - 32) |
8581                       1 << (OP_TEST_STATEID - 32) |
8582                       1 << (OP_FREE_STATEID - 32) |
8583                       1 << (OP_WRITE - 32)
8584         }
8585 };
8586
8587 /*
8588  * Select the state protection mode for client `clp' given the server results
8589  * from exchange_id in `sp'.
8590  *
8591  * Returns 0 on success, negative errno otherwise.
8592  */
8593 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8594                                  struct nfs41_state_protection *sp)
8595 {
8596         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8597                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8598                       1 << (OP_EXCHANGE_ID - 32) |
8599                       1 << (OP_CREATE_SESSION - 32) |
8600                       1 << (OP_DESTROY_SESSION - 32) |
8601                       1 << (OP_DESTROY_CLIENTID - 32)
8602         };
8603         unsigned long flags = 0;
8604         unsigned int i;
8605         int ret = 0;
8606
8607         if (sp->how == SP4_MACH_CRED) {
8608                 /* Print state protect result */
8609                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8610                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8611                         if (test_bit(i, sp->enforce.u.longs))
8612                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8613                         if (test_bit(i, sp->allow.u.longs))
8614                                 dfprintk(MOUNT, "  allow op %d\n", i);
8615                 }
8616
8617                 /* make sure nothing is on enforce list that isn't supported */
8618                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8619                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8620                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8621                                 ret = -EINVAL;
8622                                 goto out;
8623                         }
8624                 }
8625
8626                 /*
8627                  * Minimal mode - state operations are allowed to use machine
8628                  * credential.  Note this already happens by default, so the
8629                  * client doesn't have to do anything more than the negotiation.
8630                  *
8631                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8632                  *       we're already using the machine cred for exchange_id
8633                  *       and will never use a different cred.
8634                  */
8635                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8636                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8637                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8638                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8639                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8640                         dfprintk(MOUNT, "  minimal mode enabled\n");
8641                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8642                 } else {
8643                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8644                         ret = -EINVAL;
8645                         goto out;
8646                 }
8647
8648                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8649                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8650                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8651                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8652                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8653                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8654                 }
8655
8656                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8657                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8658                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8659                 }
8660
8661                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8662                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8663                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8664                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8665                 }
8666
8667                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8668                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8669                         dfprintk(MOUNT, "  stateid mode enabled\n");
8670                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8671                 }
8672
8673                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8674                         dfprintk(MOUNT, "  write mode enabled\n");
8675                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8676                 }
8677
8678                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8679                         dfprintk(MOUNT, "  commit mode enabled\n");
8680                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8681                 }
8682         }
8683 out:
8684         clp->cl_sp4_flags = flags;
8685         return ret;
8686 }
8687
8688 struct nfs41_exchange_id_data {
8689         struct nfs41_exchange_id_res res;
8690         struct nfs41_exchange_id_args args;
8691 };
8692
8693 static void nfs4_exchange_id_release(void *data)
8694 {
8695         struct nfs41_exchange_id_data *cdata =
8696                                         (struct nfs41_exchange_id_data *)data;
8697
8698         nfs_put_client(cdata->args.client);
8699         kfree(cdata->res.impl_id);
8700         kfree(cdata->res.server_scope);
8701         kfree(cdata->res.server_owner);
8702         kfree(cdata);
8703 }
8704
8705 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8706         .rpc_release = nfs4_exchange_id_release,
8707 };
8708
8709 /*
8710  * _nfs4_proc_exchange_id()
8711  *
8712  * Wrapper for EXCHANGE_ID operation.
8713  */
8714 static struct rpc_task *
8715 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8716                         u32 sp4_how, struct rpc_xprt *xprt)
8717 {
8718         struct rpc_message msg = {
8719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8720                 .rpc_cred = cred,
8721         };
8722         struct rpc_task_setup task_setup_data = {
8723                 .rpc_client = clp->cl_rpcclient,
8724                 .callback_ops = &nfs4_exchange_id_call_ops,
8725                 .rpc_message = &msg,
8726                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8727         };
8728         struct nfs41_exchange_id_data *calldata;
8729         int status;
8730
8731         if (!refcount_inc_not_zero(&clp->cl_count))
8732                 return ERR_PTR(-EIO);
8733
8734         status = -ENOMEM;
8735         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8736         if (!calldata)
8737                 goto out;
8738
8739         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8740
8741         status = nfs4_init_uniform_client_string(clp);
8742         if (status)
8743                 goto out_calldata;
8744
8745         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8746                                                 GFP_NOFS);
8747         status = -ENOMEM;
8748         if (unlikely(calldata->res.server_owner == NULL))
8749                 goto out_calldata;
8750
8751         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8752                                         GFP_NOFS);
8753         if (unlikely(calldata->res.server_scope == NULL))
8754                 goto out_server_owner;
8755
8756         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8757         if (unlikely(calldata->res.impl_id == NULL))
8758                 goto out_server_scope;
8759
8760         switch (sp4_how) {
8761         case SP4_NONE:
8762                 calldata->args.state_protect.how = SP4_NONE;
8763                 break;
8764
8765         case SP4_MACH_CRED:
8766                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8767                 break;
8768
8769         default:
8770                 /* unsupported! */
8771                 WARN_ON_ONCE(1);
8772                 status = -EINVAL;
8773                 goto out_impl_id;
8774         }
8775         if (xprt) {
8776                 task_setup_data.rpc_xprt = xprt;
8777                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8778                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8779                                 sizeof(calldata->args.verifier.data));
8780         }
8781         calldata->args.client = clp;
8782         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8783         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8784 #ifdef CONFIG_NFS_V4_1_MIGRATION
8785         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8786 #endif
8787         msg.rpc_argp = &calldata->args;
8788         msg.rpc_resp = &calldata->res;
8789         task_setup_data.callback_data = calldata;
8790
8791         return rpc_run_task(&task_setup_data);
8792
8793 out_impl_id:
8794         kfree(calldata->res.impl_id);
8795 out_server_scope:
8796         kfree(calldata->res.server_scope);
8797 out_server_owner:
8798         kfree(calldata->res.server_owner);
8799 out_calldata:
8800         kfree(calldata);
8801 out:
8802         nfs_put_client(clp);
8803         return ERR_PTR(status);
8804 }
8805
8806 /*
8807  * _nfs4_proc_exchange_id()
8808  *
8809  * Wrapper for EXCHANGE_ID operation.
8810  */
8811 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8812                         u32 sp4_how)
8813 {
8814         struct rpc_task *task;
8815         struct nfs41_exchange_id_args *argp;
8816         struct nfs41_exchange_id_res *resp;
8817         unsigned long now = jiffies;
8818         int status;
8819
8820         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8821         if (IS_ERR(task))
8822                 return PTR_ERR(task);
8823
8824         argp = task->tk_msg.rpc_argp;
8825         resp = task->tk_msg.rpc_resp;
8826         status = task->tk_status;
8827         if (status  != 0)
8828                 goto out;
8829
8830         status = nfs4_check_cl_exchange_flags(resp->flags,
8831                         clp->cl_mvops->minor_version);
8832         if (status  != 0)
8833                 goto out;
8834
8835         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8836         if (status != 0)
8837                 goto out;
8838
8839         do_renew_lease(clp, now);
8840
8841         clp->cl_clientid = resp->clientid;
8842         clp->cl_exchange_flags = resp->flags;
8843         clp->cl_seqid = resp->seqid;
8844         /* Client ID is not confirmed */
8845         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8846                 clear_bit(NFS4_SESSION_ESTABLISHED,
8847                           &clp->cl_session->session_state);
8848
8849         if (clp->cl_serverscope != NULL &&
8850             !nfs41_same_server_scope(clp->cl_serverscope,
8851                                 resp->server_scope)) {
8852                 dprintk("%s: server_scope mismatch detected\n",
8853                         __func__);
8854                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8855         }
8856
8857         swap(clp->cl_serverowner, resp->server_owner);
8858         swap(clp->cl_serverscope, resp->server_scope);
8859         swap(clp->cl_implid, resp->impl_id);
8860
8861         /* Save the EXCHANGE_ID verifier session trunk tests */
8862         memcpy(clp->cl_confirm.data, argp->verifier.data,
8863                sizeof(clp->cl_confirm.data));
8864 out:
8865         trace_nfs4_exchange_id(clp, status);
8866         rpc_put_task(task);
8867         return status;
8868 }
8869
8870 /*
8871  * nfs4_proc_exchange_id()
8872  *
8873  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8874  *
8875  * Since the clientid has expired, all compounds using sessions
8876  * associated with the stale clientid will be returning
8877  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8878  * be in some phase of session reset.
8879  *
8880  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8881  */
8882 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8883 {
8884         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8885         int status;
8886
8887         /* try SP4_MACH_CRED if krb5i/p */
8888         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8889             authflavor == RPC_AUTH_GSS_KRB5P) {
8890                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8891                 if (!status)
8892                         return 0;
8893         }
8894
8895         /* try SP4_NONE */
8896         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8897 }
8898
8899 /**
8900  * nfs4_test_session_trunk
8901  *
8902  * This is an add_xprt_test() test function called from
8903  * rpc_clnt_setup_test_and_add_xprt.
8904  *
8905  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8906  * and is dereferrenced in nfs4_exchange_id_release
8907  *
8908  * Upon success, add the new transport to the rpc_clnt
8909  *
8910  * @clnt: struct rpc_clnt to get new transport
8911  * @xprt: the rpc_xprt to test
8912  * @data: call data for _nfs4_proc_exchange_id.
8913  */
8914 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8915                             void *data)
8916 {
8917         struct nfs4_add_xprt_data *adata = data;
8918         struct rpc_task *task;
8919         int status;
8920
8921         u32 sp4_how;
8922
8923         dprintk("--> %s try %s\n", __func__,
8924                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8925
8926         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8927
8928         /* Test connection for session trunking. Async exchange_id call */
8929         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8930         if (IS_ERR(task))
8931                 return;
8932
8933         status = task->tk_status;
8934         if (status == 0)
8935                 status = nfs4_detect_session_trunking(adata->clp,
8936                                 task->tk_msg.rpc_resp, xprt);
8937
8938         if (status == 0)
8939                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8940         else if (rpc_clnt_xprt_switch_has_addr(clnt,
8941                                 (struct sockaddr *)&xprt->addr))
8942                 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8943
8944         rpc_put_task(task);
8945 }
8946 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8947
8948 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8949                 const struct cred *cred)
8950 {
8951         struct rpc_message msg = {
8952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8953                 .rpc_argp = clp,
8954                 .rpc_cred = cred,
8955         };
8956         int status;
8957
8958         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8959                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8960         trace_nfs4_destroy_clientid(clp, status);
8961         if (status)
8962                 dprintk("NFS: Got error %d from the server %s on "
8963                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8964         return status;
8965 }
8966
8967 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8968                 const struct cred *cred)
8969 {
8970         unsigned int loop;
8971         int ret;
8972
8973         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8974                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8975                 switch (ret) {
8976                 case -NFS4ERR_DELAY:
8977                 case -NFS4ERR_CLIENTID_BUSY:
8978                         ssleep(1);
8979                         break;
8980                 default:
8981                         return ret;
8982                 }
8983         }
8984         return 0;
8985 }
8986
8987 int nfs4_destroy_clientid(struct nfs_client *clp)
8988 {
8989         const struct cred *cred;
8990         int ret = 0;
8991
8992         if (clp->cl_mvops->minor_version < 1)
8993                 goto out;
8994         if (clp->cl_exchange_flags == 0)
8995                 goto out;
8996         if (clp->cl_preserve_clid)
8997                 goto out;
8998         cred = nfs4_get_clid_cred(clp);
8999         ret = nfs4_proc_destroy_clientid(clp, cred);
9000         put_cred(cred);
9001         switch (ret) {
9002         case 0:
9003         case -NFS4ERR_STALE_CLIENTID:
9004                 clp->cl_exchange_flags = 0;
9005         }
9006 out:
9007         return ret;
9008 }
9009
9010 #endif /* CONFIG_NFS_V4_1 */
9011
9012 struct nfs4_get_lease_time_data {
9013         struct nfs4_get_lease_time_args *args;
9014         struct nfs4_get_lease_time_res *res;
9015         struct nfs_client *clp;
9016 };
9017
9018 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9019                                         void *calldata)
9020 {
9021         struct nfs4_get_lease_time_data *data =
9022                         (struct nfs4_get_lease_time_data *)calldata;
9023
9024         /* just setup sequence, do not trigger session recovery
9025            since we're invoked within one */
9026         nfs4_setup_sequence(data->clp,
9027                         &data->args->la_seq_args,
9028                         &data->res->lr_seq_res,
9029                         task);
9030 }
9031
9032 /*
9033  * Called from nfs4_state_manager thread for session setup, so don't recover
9034  * from sequence operation or clientid errors.
9035  */
9036 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9037 {
9038         struct nfs4_get_lease_time_data *data =
9039                         (struct nfs4_get_lease_time_data *)calldata;
9040
9041         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9042                 return;
9043         switch (task->tk_status) {
9044         case -NFS4ERR_DELAY:
9045         case -NFS4ERR_GRACE:
9046                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9047                 task->tk_status = 0;
9048                 fallthrough;
9049         case -NFS4ERR_RETRY_UNCACHED_REP:
9050                 rpc_restart_call_prepare(task);
9051                 return;
9052         }
9053 }
9054
9055 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9056         .rpc_call_prepare = nfs4_get_lease_time_prepare,
9057         .rpc_call_done = nfs4_get_lease_time_done,
9058 };
9059
9060 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9061 {
9062         struct nfs4_get_lease_time_args args;
9063         struct nfs4_get_lease_time_res res = {
9064                 .lr_fsinfo = fsinfo,
9065         };
9066         struct nfs4_get_lease_time_data data = {
9067                 .args = &args,
9068                 .res = &res,
9069                 .clp = clp,
9070         };
9071         struct rpc_message msg = {
9072                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9073                 .rpc_argp = &args,
9074                 .rpc_resp = &res,
9075         };
9076         struct rpc_task_setup task_setup = {
9077                 .rpc_client = clp->cl_rpcclient,
9078                 .rpc_message = &msg,
9079                 .callback_ops = &nfs4_get_lease_time_ops,
9080                 .callback_data = &data,
9081                 .flags = RPC_TASK_TIMEOUT,
9082         };
9083
9084         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9085         return nfs4_call_sync_custom(&task_setup);
9086 }
9087
9088 #ifdef CONFIG_NFS_V4_1
9089
9090 /*
9091  * Initialize the values to be used by the client in CREATE_SESSION
9092  * If nfs4_init_session set the fore channel request and response sizes,
9093  * use them.
9094  *
9095  * Set the back channel max_resp_sz_cached to zero to force the client to
9096  * always set csa_cachethis to FALSE because the current implementation
9097  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9098  */
9099 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9100                                     struct rpc_clnt *clnt)
9101 {
9102         unsigned int max_rqst_sz, max_resp_sz;
9103         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9104         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9105
9106         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9107         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9108
9109         /* Fore channel attributes */
9110         args->fc_attrs.max_rqst_sz = max_rqst_sz;
9111         args->fc_attrs.max_resp_sz = max_resp_sz;
9112         args->fc_attrs.max_ops = NFS4_MAX_OPS;
9113         args->fc_attrs.max_reqs = max_session_slots;
9114
9115         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9116                 "max_ops=%u max_reqs=%u\n",
9117                 __func__,
9118                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9119                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9120
9121         /* Back channel attributes */
9122         args->bc_attrs.max_rqst_sz = max_bc_payload;
9123         args->bc_attrs.max_resp_sz = max_bc_payload;
9124         args->bc_attrs.max_resp_sz_cached = 0;
9125         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9126         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9127         if (args->bc_attrs.max_reqs > max_bc_slots)
9128                 args->bc_attrs.max_reqs = max_bc_slots;
9129
9130         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9131                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9132                 __func__,
9133                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9134                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9135                 args->bc_attrs.max_reqs);
9136 }
9137
9138 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9139                 struct nfs41_create_session_res *res)
9140 {
9141         struct nfs4_channel_attrs *sent = &args->fc_attrs;
9142         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9143
9144         if (rcvd->max_resp_sz > sent->max_resp_sz)
9145                 return -EINVAL;
9146         /*
9147          * Our requested max_ops is the minimum we need; we're not
9148          * prepared to break up compounds into smaller pieces than that.
9149          * So, no point even trying to continue if the server won't
9150          * cooperate:
9151          */
9152         if (rcvd->max_ops < sent->max_ops)
9153                 return -EINVAL;
9154         if (rcvd->max_reqs == 0)
9155                 return -EINVAL;
9156         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9157                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9158         return 0;
9159 }
9160
9161 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9162                 struct nfs41_create_session_res *res)
9163 {
9164         struct nfs4_channel_attrs *sent = &args->bc_attrs;
9165         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9166
9167         if (!(res->flags & SESSION4_BACK_CHAN))
9168                 goto out;
9169         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9170                 return -EINVAL;
9171         if (rcvd->max_resp_sz < sent->max_resp_sz)
9172                 return -EINVAL;
9173         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9174                 return -EINVAL;
9175         if (rcvd->max_ops > sent->max_ops)
9176                 return -EINVAL;
9177         if (rcvd->max_reqs > sent->max_reqs)
9178                 return -EINVAL;
9179 out:
9180         return 0;
9181 }
9182
9183 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9184                                      struct nfs41_create_session_res *res)
9185 {
9186         int ret;
9187
9188         ret = nfs4_verify_fore_channel_attrs(args, res);
9189         if (ret)
9190                 return ret;
9191         return nfs4_verify_back_channel_attrs(args, res);
9192 }
9193
9194 static void nfs4_update_session(struct nfs4_session *session,
9195                 struct nfs41_create_session_res *res)
9196 {
9197         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9198         /* Mark client id and session as being confirmed */
9199         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9200         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9201         session->flags = res->flags;
9202         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9203         if (res->flags & SESSION4_BACK_CHAN)
9204                 memcpy(&session->bc_attrs, &res->bc_attrs,
9205                                 sizeof(session->bc_attrs));
9206 }
9207
9208 static int _nfs4_proc_create_session(struct nfs_client *clp,
9209                 const struct cred *cred)
9210 {
9211         struct nfs4_session *session = clp->cl_session;
9212         struct nfs41_create_session_args args = {
9213                 .client = clp,
9214                 .clientid = clp->cl_clientid,
9215                 .seqid = clp->cl_seqid,
9216                 .cb_program = NFS4_CALLBACK,
9217         };
9218         struct nfs41_create_session_res res;
9219
9220         struct rpc_message msg = {
9221                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9222                 .rpc_argp = &args,
9223                 .rpc_resp = &res,
9224                 .rpc_cred = cred,
9225         };
9226         int status;
9227
9228         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9229         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9230
9231         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9232                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9233         trace_nfs4_create_session(clp, status);
9234
9235         switch (status) {
9236         case -NFS4ERR_STALE_CLIENTID:
9237         case -NFS4ERR_DELAY:
9238         case -ETIMEDOUT:
9239         case -EACCES:
9240         case -EAGAIN:
9241                 goto out;
9242         }
9243
9244         clp->cl_seqid++;
9245         if (!status) {
9246                 /* Verify the session's negotiated channel_attrs values */
9247                 status = nfs4_verify_channel_attrs(&args, &res);
9248                 /* Increment the clientid slot sequence id */
9249                 if (status)
9250                         goto out;
9251                 nfs4_update_session(session, &res);
9252         }
9253 out:
9254         return status;
9255 }
9256
9257 /*
9258  * Issues a CREATE_SESSION operation to the server.
9259  * It is the responsibility of the caller to verify the session is
9260  * expired before calling this routine.
9261  */
9262 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9263 {
9264         int status;
9265         unsigned *ptr;
9266         struct nfs4_session *session = clp->cl_session;
9267         struct nfs4_add_xprt_data xprtdata = {
9268                 .clp = clp,
9269         };
9270         struct rpc_add_xprt_test rpcdata = {
9271                 .add_xprt_test = clp->cl_mvops->session_trunk,
9272                 .data = &xprtdata,
9273         };
9274
9275         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9276
9277         status = _nfs4_proc_create_session(clp, cred);
9278         if (status)
9279                 goto out;
9280
9281         /* Init or reset the session slot tables */
9282         status = nfs4_setup_session_slot_tables(session);
9283         dprintk("slot table setup returned %d\n", status);
9284         if (status)
9285                 goto out;
9286
9287         ptr = (unsigned *)&session->sess_id.data[0];
9288         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9289                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9290         rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9291 out:
9292         return status;
9293 }
9294
9295 /*
9296  * Issue the over-the-wire RPC DESTROY_SESSION.
9297  * The caller must serialize access to this routine.
9298  */
9299 int nfs4_proc_destroy_session(struct nfs4_session *session,
9300                 const struct cred *cred)
9301 {
9302         struct rpc_message msg = {
9303                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9304                 .rpc_argp = session,
9305                 .rpc_cred = cred,
9306         };
9307         int status = 0;
9308
9309         /* session is still being setup */
9310         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9311                 return 0;
9312
9313         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9314                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9315         trace_nfs4_destroy_session(session->clp, status);
9316
9317         if (status)
9318                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9319                         "Session has been destroyed regardless...\n", status);
9320         rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9321         return status;
9322 }
9323
9324 /*
9325  * Renew the cl_session lease.
9326  */
9327 struct nfs4_sequence_data {
9328         struct nfs_client *clp;
9329         struct nfs4_sequence_args args;
9330         struct nfs4_sequence_res res;
9331 };
9332
9333 static void nfs41_sequence_release(void *data)
9334 {
9335         struct nfs4_sequence_data *calldata = data;
9336         struct nfs_client *clp = calldata->clp;
9337
9338         if (refcount_read(&clp->cl_count) > 1)
9339                 nfs4_schedule_state_renewal(clp);
9340         nfs_put_client(clp);
9341         kfree(calldata);
9342 }
9343
9344 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9345 {
9346         switch(task->tk_status) {
9347         case -NFS4ERR_DELAY:
9348                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9349                 return -EAGAIN;
9350         default:
9351                 nfs4_schedule_lease_recovery(clp);
9352         }
9353         return 0;
9354 }
9355
9356 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9357 {
9358         struct nfs4_sequence_data *calldata = data;
9359         struct nfs_client *clp = calldata->clp;
9360
9361         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9362                 return;
9363
9364         trace_nfs4_sequence(clp, task->tk_status);
9365         if (task->tk_status < 0) {
9366                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9367                 if (refcount_read(&clp->cl_count) == 1)
9368                         return;
9369
9370                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9371                         rpc_restart_call_prepare(task);
9372                         return;
9373                 }
9374         }
9375         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9376 }
9377
9378 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9379 {
9380         struct nfs4_sequence_data *calldata = data;
9381         struct nfs_client *clp = calldata->clp;
9382         struct nfs4_sequence_args *args;
9383         struct nfs4_sequence_res *res;
9384
9385         args = task->tk_msg.rpc_argp;
9386         res = task->tk_msg.rpc_resp;
9387
9388         nfs4_setup_sequence(clp, args, res, task);
9389 }
9390
9391 static const struct rpc_call_ops nfs41_sequence_ops = {
9392         .rpc_call_done = nfs41_sequence_call_done,
9393         .rpc_call_prepare = nfs41_sequence_prepare,
9394         .rpc_release = nfs41_sequence_release,
9395 };
9396
9397 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9398                 const struct cred *cred,
9399                 struct nfs4_slot *slot,
9400                 bool is_privileged)
9401 {
9402         struct nfs4_sequence_data *calldata;
9403         struct rpc_message msg = {
9404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9405                 .rpc_cred = cred,
9406         };
9407         struct rpc_task_setup task_setup_data = {
9408                 .rpc_client = clp->cl_rpcclient,
9409                 .rpc_message = &msg,
9410                 .callback_ops = &nfs41_sequence_ops,
9411                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9412         };
9413         struct rpc_task *ret;
9414
9415         ret = ERR_PTR(-EIO);
9416         if (!refcount_inc_not_zero(&clp->cl_count))
9417                 goto out_err;
9418
9419         ret = ERR_PTR(-ENOMEM);
9420         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9421         if (calldata == NULL)
9422                 goto out_put_clp;
9423         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9424         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9425         msg.rpc_argp = &calldata->args;
9426         msg.rpc_resp = &calldata->res;
9427         calldata->clp = clp;
9428         task_setup_data.callback_data = calldata;
9429
9430         ret = rpc_run_task(&task_setup_data);
9431         if (IS_ERR(ret))
9432                 goto out_err;
9433         return ret;
9434 out_put_clp:
9435         nfs_put_client(clp);
9436 out_err:
9437         nfs41_release_slot(slot);
9438         return ret;
9439 }
9440
9441 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9442 {
9443         struct rpc_task *task;
9444         int ret = 0;
9445
9446         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9447                 return -EAGAIN;
9448         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9449         if (IS_ERR(task))
9450                 ret = PTR_ERR(task);
9451         else
9452                 rpc_put_task_async(task);
9453         dprintk("<-- %s status=%d\n", __func__, ret);
9454         return ret;
9455 }
9456
9457 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9458 {
9459         struct rpc_task *task;
9460         int ret;
9461
9462         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9463         if (IS_ERR(task)) {
9464                 ret = PTR_ERR(task);
9465                 goto out;
9466         }
9467         ret = rpc_wait_for_completion_task(task);
9468         if (!ret)
9469                 ret = task->tk_status;
9470         rpc_put_task(task);
9471 out:
9472         dprintk("<-- %s status=%d\n", __func__, ret);
9473         return ret;
9474 }
9475
9476 struct nfs4_reclaim_complete_data {
9477         struct nfs_client *clp;
9478         struct nfs41_reclaim_complete_args arg;
9479         struct nfs41_reclaim_complete_res res;
9480 };
9481
9482 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9483 {
9484         struct nfs4_reclaim_complete_data *calldata = data;
9485
9486         nfs4_setup_sequence(calldata->clp,
9487                         &calldata->arg.seq_args,
9488                         &calldata->res.seq_res,
9489                         task);
9490 }
9491
9492 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9493 {
9494         switch(task->tk_status) {
9495         case 0:
9496                 wake_up_all(&clp->cl_lock_waitq);
9497                 fallthrough;
9498         case -NFS4ERR_COMPLETE_ALREADY:
9499         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9500                 break;
9501         case -NFS4ERR_DELAY:
9502                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9503                 fallthrough;
9504         case -NFS4ERR_RETRY_UNCACHED_REP:
9505         case -EACCES:
9506                 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9507                         __func__, task->tk_status, clp->cl_hostname);
9508                 return -EAGAIN;
9509         case -NFS4ERR_BADSESSION:
9510         case -NFS4ERR_DEADSESSION:
9511         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9512                 break;
9513         default:
9514                 nfs4_schedule_lease_recovery(clp);
9515         }
9516         return 0;
9517 }
9518
9519 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9520 {
9521         struct nfs4_reclaim_complete_data *calldata = data;
9522         struct nfs_client *clp = calldata->clp;
9523         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9524
9525         if (!nfs41_sequence_done(task, res))
9526                 return;
9527
9528         trace_nfs4_reclaim_complete(clp, task->tk_status);
9529         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9530                 rpc_restart_call_prepare(task);
9531                 return;
9532         }
9533 }
9534
9535 static void nfs4_free_reclaim_complete_data(void *data)
9536 {
9537         struct nfs4_reclaim_complete_data *calldata = data;
9538
9539         kfree(calldata);
9540 }
9541
9542 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9543         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9544         .rpc_call_done = nfs4_reclaim_complete_done,
9545         .rpc_release = nfs4_free_reclaim_complete_data,
9546 };
9547
9548 /*
9549  * Issue a global reclaim complete.
9550  */
9551 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9552                 const struct cred *cred)
9553 {
9554         struct nfs4_reclaim_complete_data *calldata;
9555         struct rpc_message msg = {
9556                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9557                 .rpc_cred = cred,
9558         };
9559         struct rpc_task_setup task_setup_data = {
9560                 .rpc_client = clp->cl_rpcclient,
9561                 .rpc_message = &msg,
9562                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9563                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9564         };
9565         int status = -ENOMEM;
9566
9567         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9568         if (calldata == NULL)
9569                 goto out;
9570         calldata->clp = clp;
9571         calldata->arg.one_fs = 0;
9572
9573         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9574         msg.rpc_argp = &calldata->arg;
9575         msg.rpc_resp = &calldata->res;
9576         task_setup_data.callback_data = calldata;
9577         status = nfs4_call_sync_custom(&task_setup_data);
9578 out:
9579         dprintk("<-- %s status=%d\n", __func__, status);
9580         return status;
9581 }
9582
9583 static void
9584 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9585 {
9586         struct nfs4_layoutget *lgp = calldata;
9587         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9588
9589         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9590                                 &lgp->res.seq_res, task);
9591 }
9592
9593 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9594 {
9595         struct nfs4_layoutget *lgp = calldata;
9596
9597         nfs41_sequence_process(task, &lgp->res.seq_res);
9598 }
9599
9600 static int
9601 nfs4_layoutget_handle_exception(struct rpc_task *task,
9602                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9603 {
9604         struct inode *inode = lgp->args.inode;
9605         struct nfs_server *server = NFS_SERVER(inode);
9606         struct pnfs_layout_hdr *lo = lgp->lo;
9607         int nfs4err = task->tk_status;
9608         int err, status = 0;
9609         LIST_HEAD(head);
9610
9611         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9612
9613         nfs4_sequence_free_slot(&lgp->res.seq_res);
9614
9615         switch (nfs4err) {
9616         case 0:
9617                 goto out;
9618
9619         /*
9620          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9621          * on the file. set tk_status to -ENODATA to tell upper layer to
9622          * retry go inband.
9623          */
9624         case -NFS4ERR_LAYOUTUNAVAILABLE:
9625                 status = -ENODATA;
9626                 goto out;
9627         /*
9628          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9629          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9630          */
9631         case -NFS4ERR_BADLAYOUT:
9632                 status = -EOVERFLOW;
9633                 goto out;
9634         /*
9635          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9636          * (or clients) writing to the same RAID stripe except when
9637          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9638          *
9639          * Treat it like we would RECALLCONFLICT -- we retry for a little
9640          * while, and then eventually give up.
9641          */
9642         case -NFS4ERR_LAYOUTTRYLATER:
9643                 if (lgp->args.minlength == 0) {
9644                         status = -EOVERFLOW;
9645                         goto out;
9646                 }
9647                 status = -EBUSY;
9648                 break;
9649         case -NFS4ERR_RECALLCONFLICT:
9650                 status = -ERECALLCONFLICT;
9651                 break;
9652         case -NFS4ERR_DELEG_REVOKED:
9653         case -NFS4ERR_ADMIN_REVOKED:
9654         case -NFS4ERR_EXPIRED:
9655         case -NFS4ERR_BAD_STATEID:
9656                 exception->timeout = 0;
9657                 spin_lock(&inode->i_lock);
9658                 /* If the open stateid was bad, then recover it. */
9659                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9660                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9661                         spin_unlock(&inode->i_lock);
9662                         exception->state = lgp->args.ctx->state;
9663                         exception->stateid = &lgp->args.stateid;
9664                         break;
9665                 }
9666
9667                 /*
9668                  * Mark the bad layout state as invalid, then retry
9669                  */
9670                 pnfs_mark_layout_stateid_invalid(lo, &head);
9671                 spin_unlock(&inode->i_lock);
9672                 nfs_commit_inode(inode, 0);
9673                 pnfs_free_lseg_list(&head);
9674                 status = -EAGAIN;
9675                 goto out;
9676         }
9677
9678         err = nfs4_handle_exception(server, nfs4err, exception);
9679         if (!status) {
9680                 if (exception->retry)
9681                         status = -EAGAIN;
9682                 else
9683                         status = err;
9684         }
9685 out:
9686         return status;
9687 }
9688
9689 size_t max_response_pages(struct nfs_server *server)
9690 {
9691         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9692         return nfs_page_array_len(0, max_resp_sz);
9693 }
9694
9695 static void nfs4_layoutget_release(void *calldata)
9696 {
9697         struct nfs4_layoutget *lgp = calldata;
9698
9699         nfs4_sequence_free_slot(&lgp->res.seq_res);
9700         pnfs_layoutget_free(lgp);
9701 }
9702
9703 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9704         .rpc_call_prepare = nfs4_layoutget_prepare,
9705         .rpc_call_done = nfs4_layoutget_done,
9706         .rpc_release = nfs4_layoutget_release,
9707 };
9708
9709 struct pnfs_layout_segment *
9710 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9711 {
9712         struct inode *inode = lgp->args.inode;
9713         struct nfs_server *server = NFS_SERVER(inode);
9714         struct rpc_task *task;
9715         struct rpc_message msg = {
9716                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9717                 .rpc_argp = &lgp->args,
9718                 .rpc_resp = &lgp->res,
9719                 .rpc_cred = lgp->cred,
9720         };
9721         struct rpc_task_setup task_setup_data = {
9722                 .rpc_client = server->client,
9723                 .rpc_message = &msg,
9724                 .callback_ops = &nfs4_layoutget_call_ops,
9725                 .callback_data = lgp,
9726                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9727                          RPC_TASK_MOVEABLE,
9728         };
9729         struct pnfs_layout_segment *lseg = NULL;
9730         struct nfs4_exception exception = {
9731                 .inode = inode,
9732                 .timeout = *timeout,
9733         };
9734         int status = 0;
9735
9736         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9737
9738         task = rpc_run_task(&task_setup_data);
9739         if (IS_ERR(task))
9740                 return ERR_CAST(task);
9741
9742         status = rpc_wait_for_completion_task(task);
9743         if (status != 0)
9744                 goto out;
9745
9746         if (task->tk_status < 0) {
9747                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9748                 *timeout = exception.timeout;
9749         } else if (lgp->res.layoutp->len == 0) {
9750                 status = -EAGAIN;
9751                 *timeout = nfs4_update_delay(&exception.timeout);
9752         } else
9753                 lseg = pnfs_layout_process(lgp);
9754 out:
9755         trace_nfs4_layoutget(lgp->args.ctx,
9756                         &lgp->args.range,
9757                         &lgp->res.range,
9758                         &lgp->res.stateid,
9759                         status);
9760
9761         rpc_put_task(task);
9762         dprintk("<-- %s status=%d\n", __func__, status);
9763         if (status)
9764                 return ERR_PTR(status);
9765         return lseg;
9766 }
9767
9768 static void
9769 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9770 {
9771         struct nfs4_layoutreturn *lrp = calldata;
9772
9773         nfs4_setup_sequence(lrp->clp,
9774                         &lrp->args.seq_args,
9775                         &lrp->res.seq_res,
9776                         task);
9777         if (!pnfs_layout_is_valid(lrp->args.layout))
9778                 rpc_exit(task, 0);
9779 }
9780
9781 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9782 {
9783         struct nfs4_layoutreturn *lrp = calldata;
9784         struct nfs_server *server;
9785
9786         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9787                 return;
9788
9789         /*
9790          * Was there an RPC level error? Assume the call succeeded,
9791          * and that we need to release the layout
9792          */
9793         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9794                 lrp->res.lrs_present = 0;
9795                 return;
9796         }
9797
9798         server = NFS_SERVER(lrp->args.inode);
9799         switch (task->tk_status) {
9800         case -NFS4ERR_OLD_STATEID:
9801                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9802                                         &lrp->args.range,
9803                                         lrp->args.inode))
9804                         goto out_restart;
9805                 fallthrough;
9806         default:
9807                 task->tk_status = 0;
9808                 fallthrough;
9809         case 0:
9810                 break;
9811         case -NFS4ERR_DELAY:
9812                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9813                         break;
9814                 goto out_restart;
9815         }
9816         return;
9817 out_restart:
9818         task->tk_status = 0;
9819         nfs4_sequence_free_slot(&lrp->res.seq_res);
9820         rpc_restart_call_prepare(task);
9821 }
9822
9823 static void nfs4_layoutreturn_release(void *calldata)
9824 {
9825         struct nfs4_layoutreturn *lrp = calldata;
9826         struct pnfs_layout_hdr *lo = lrp->args.layout;
9827
9828         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9829                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9830         nfs4_sequence_free_slot(&lrp->res.seq_res);
9831         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9832                 lrp->ld_private.ops->free(&lrp->ld_private);
9833         pnfs_put_layout_hdr(lrp->args.layout);
9834         nfs_iput_and_deactive(lrp->inode);
9835         put_cred(lrp->cred);
9836         kfree(calldata);
9837 }
9838
9839 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9840         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9841         .rpc_call_done = nfs4_layoutreturn_done,
9842         .rpc_release = nfs4_layoutreturn_release,
9843 };
9844
9845 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9846 {
9847         struct rpc_task *task;
9848         struct rpc_message msg = {
9849                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9850                 .rpc_argp = &lrp->args,
9851                 .rpc_resp = &lrp->res,
9852                 .rpc_cred = lrp->cred,
9853         };
9854         struct rpc_task_setup task_setup_data = {
9855                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9856                 .rpc_message = &msg,
9857                 .callback_ops = &nfs4_layoutreturn_call_ops,
9858                 .callback_data = lrp,
9859                 .flags = RPC_TASK_MOVEABLE,
9860         };
9861         int status = 0;
9862
9863         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9864                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9865                         &task_setup_data.rpc_client, &msg);
9866
9867         lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9868         if (!sync) {
9869                 if (!lrp->inode) {
9870                         nfs4_layoutreturn_release(lrp);
9871                         return -EAGAIN;
9872                 }
9873                 task_setup_data.flags |= RPC_TASK_ASYNC;
9874         }
9875         if (!lrp->inode)
9876                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9877                                    1);
9878         else
9879                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9880                                    0);
9881         task = rpc_run_task(&task_setup_data);
9882         if (IS_ERR(task))
9883                 return PTR_ERR(task);
9884         if (sync)
9885                 status = task->tk_status;
9886         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9887         dprintk("<-- %s status=%d\n", __func__, status);
9888         rpc_put_task(task);
9889         return status;
9890 }
9891
9892 static int
9893 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9894                 struct pnfs_device *pdev,
9895                 const struct cred *cred)
9896 {
9897         struct nfs4_getdeviceinfo_args args = {
9898                 .pdev = pdev,
9899                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9900                         NOTIFY_DEVICEID4_DELETE,
9901         };
9902         struct nfs4_getdeviceinfo_res res = {
9903                 .pdev = pdev,
9904         };
9905         struct rpc_message msg = {
9906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9907                 .rpc_argp = &args,
9908                 .rpc_resp = &res,
9909                 .rpc_cred = cred,
9910         };
9911         int status;
9912
9913         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9914         if (res.notification & ~args.notify_types)
9915                 dprintk("%s: unsupported notification\n", __func__);
9916         if (res.notification != args.notify_types)
9917                 pdev->nocache = 1;
9918
9919         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9920
9921         dprintk("<-- %s status=%d\n", __func__, status);
9922
9923         return status;
9924 }
9925
9926 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9927                 struct pnfs_device *pdev,
9928                 const struct cred *cred)
9929 {
9930         struct nfs4_exception exception = { };
9931         int err;
9932
9933         do {
9934                 err = nfs4_handle_exception(server,
9935                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9936                                         &exception);
9937         } while (exception.retry);
9938         return err;
9939 }
9940 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9941
9942 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9943 {
9944         struct nfs4_layoutcommit_data *data = calldata;
9945         struct nfs_server *server = NFS_SERVER(data->args.inode);
9946
9947         nfs4_setup_sequence(server->nfs_client,
9948                         &data->args.seq_args,
9949                         &data->res.seq_res,
9950                         task);
9951 }
9952
9953 static void
9954 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9955 {
9956         struct nfs4_layoutcommit_data *data = calldata;
9957         struct nfs_server *server = NFS_SERVER(data->args.inode);
9958
9959         if (!nfs41_sequence_done(task, &data->res.seq_res))
9960                 return;
9961
9962         switch (task->tk_status) { /* Just ignore these failures */
9963         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9964         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9965         case -NFS4ERR_BADLAYOUT:     /* no layout */
9966         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9967                 task->tk_status = 0;
9968                 break;
9969         case 0:
9970                 break;
9971         default:
9972                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9973                         rpc_restart_call_prepare(task);
9974                         return;
9975                 }
9976         }
9977 }
9978
9979 static void nfs4_layoutcommit_release(void *calldata)
9980 {
9981         struct nfs4_layoutcommit_data *data = calldata;
9982
9983         pnfs_cleanup_layoutcommit(data);
9984         nfs_post_op_update_inode_force_wcc(data->args.inode,
9985                                            data->res.fattr);
9986         put_cred(data->cred);
9987         nfs_iput_and_deactive(data->inode);
9988         kfree(data);
9989 }
9990
9991 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9992         .rpc_call_prepare = nfs4_layoutcommit_prepare,
9993         .rpc_call_done = nfs4_layoutcommit_done,
9994         .rpc_release = nfs4_layoutcommit_release,
9995 };
9996
9997 int
9998 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9999 {
10000         struct rpc_message msg = {
10001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10002                 .rpc_argp = &data->args,
10003                 .rpc_resp = &data->res,
10004                 .rpc_cred = data->cred,
10005         };
10006         struct rpc_task_setup task_setup_data = {
10007                 .task = &data->task,
10008                 .rpc_client = NFS_CLIENT(data->args.inode),
10009                 .rpc_message = &msg,
10010                 .callback_ops = &nfs4_layoutcommit_ops,
10011                 .callback_data = data,
10012                 .flags = RPC_TASK_MOVEABLE,
10013         };
10014         struct rpc_task *task;
10015         int status = 0;
10016
10017         dprintk("NFS: initiating layoutcommit call. sync %d "
10018                 "lbw: %llu inode %lu\n", sync,
10019                 data->args.lastbytewritten,
10020                 data->args.inode->i_ino);
10021
10022         if (!sync) {
10023                 data->inode = nfs_igrab_and_active(data->args.inode);
10024                 if (data->inode == NULL) {
10025                         nfs4_layoutcommit_release(data);
10026                         return -EAGAIN;
10027                 }
10028                 task_setup_data.flags = RPC_TASK_ASYNC;
10029         }
10030         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10031         task = rpc_run_task(&task_setup_data);
10032         if (IS_ERR(task))
10033                 return PTR_ERR(task);
10034         if (sync)
10035                 status = task->tk_status;
10036         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10037         dprintk("%s: status %d\n", __func__, status);
10038         rpc_put_task(task);
10039         return status;
10040 }
10041
10042 /*
10043  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10044  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10045  */
10046 static int
10047 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10048                     struct nfs_fsinfo *info,
10049                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10050 {
10051         struct nfs41_secinfo_no_name_args args = {
10052                 .style = SECINFO_STYLE_CURRENT_FH,
10053         };
10054         struct nfs4_secinfo_res res = {
10055                 .flavors = flavors,
10056         };
10057         struct rpc_message msg = {
10058                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10059                 .rpc_argp = &args,
10060                 .rpc_resp = &res,
10061         };
10062         struct nfs4_call_sync_data data = {
10063                 .seq_server = server,
10064                 .seq_args = &args.seq_args,
10065                 .seq_res = &res.seq_res,
10066         };
10067         struct rpc_task_setup task_setup = {
10068                 .rpc_client = server->client,
10069                 .rpc_message = &msg,
10070                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10071                 .callback_data = &data,
10072                 .flags = RPC_TASK_NO_ROUND_ROBIN,
10073         };
10074         const struct cred *cred = NULL;
10075         int status;
10076
10077         if (use_integrity) {
10078                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10079
10080                 cred = nfs4_get_clid_cred(server->nfs_client);
10081                 msg.rpc_cred = cred;
10082         }
10083
10084         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10085         status = nfs4_call_sync_custom(&task_setup);
10086         dprintk("<-- %s status=%d\n", __func__, status);
10087
10088         put_cred(cred);
10089
10090         return status;
10091 }
10092
10093 static int
10094 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10095                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10096 {
10097         struct nfs4_exception exception = {
10098                 .interruptible = true,
10099         };
10100         int err;
10101         do {
10102                 /* first try using integrity protection */
10103                 err = -NFS4ERR_WRONGSEC;
10104
10105                 /* try to use integrity protection with machine cred */
10106                 if (_nfs4_is_integrity_protected(server->nfs_client))
10107                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10108                                                           flavors, true);
10109
10110                 /*
10111                  * if unable to use integrity protection, or SECINFO with
10112                  * integrity protection returns NFS4ERR_WRONGSEC (which is
10113                  * disallowed by spec, but exists in deployed servers) use
10114                  * the current filesystem's rpc_client and the user cred.
10115                  */
10116                 if (err == -NFS4ERR_WRONGSEC)
10117                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10118                                                           flavors, false);
10119
10120                 switch (err) {
10121                 case 0:
10122                 case -NFS4ERR_WRONGSEC:
10123                 case -ENOTSUPP:
10124                         goto out;
10125                 default:
10126                         err = nfs4_handle_exception(server, err, &exception);
10127                 }
10128         } while (exception.retry);
10129 out:
10130         return err;
10131 }
10132
10133 static int
10134 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10135                     struct nfs_fsinfo *info)
10136 {
10137         int err;
10138         struct page *page;
10139         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10140         struct nfs4_secinfo_flavors *flavors;
10141         struct nfs4_secinfo4 *secinfo;
10142         int i;
10143
10144         page = alloc_page(GFP_KERNEL);
10145         if (!page) {
10146                 err = -ENOMEM;
10147                 goto out;
10148         }
10149
10150         flavors = page_address(page);
10151         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10152
10153         /*
10154          * Fall back on "guess and check" method if
10155          * the server doesn't support SECINFO_NO_NAME
10156          */
10157         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10158                 err = nfs4_find_root_sec(server, fhandle, info);
10159                 goto out_freepage;
10160         }
10161         if (err)
10162                 goto out_freepage;
10163
10164         for (i = 0; i < flavors->num_flavors; i++) {
10165                 secinfo = &flavors->flavors[i];
10166
10167                 switch (secinfo->flavor) {
10168                 case RPC_AUTH_NULL:
10169                 case RPC_AUTH_UNIX:
10170                 case RPC_AUTH_GSS:
10171                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10172                                         &secinfo->flavor_info);
10173                         break;
10174                 default:
10175                         flavor = RPC_AUTH_MAXFLAVOR;
10176                         break;
10177                 }
10178
10179                 if (!nfs_auth_info_match(&server->auth_info, flavor))
10180                         flavor = RPC_AUTH_MAXFLAVOR;
10181
10182                 if (flavor != RPC_AUTH_MAXFLAVOR) {
10183                         err = nfs4_lookup_root_sec(server, fhandle,
10184                                                    info, flavor);
10185                         if (!err)
10186                                 break;
10187                 }
10188         }
10189
10190         if (flavor == RPC_AUTH_MAXFLAVOR)
10191                 err = -EPERM;
10192
10193 out_freepage:
10194         put_page(page);
10195         if (err == -EACCES)
10196                 return -EPERM;
10197 out:
10198         return err;
10199 }
10200
10201 static int _nfs41_test_stateid(struct nfs_server *server,
10202                 nfs4_stateid *stateid,
10203                 const struct cred *cred)
10204 {
10205         int status;
10206         struct nfs41_test_stateid_args args = {
10207                 .stateid = stateid,
10208         };
10209         struct nfs41_test_stateid_res res;
10210         struct rpc_message msg = {
10211                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10212                 .rpc_argp = &args,
10213                 .rpc_resp = &res,
10214                 .rpc_cred = cred,
10215         };
10216         struct rpc_clnt *rpc_client = server->client;
10217
10218         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10219                 &rpc_client, &msg);
10220
10221         dprintk("NFS call  test_stateid %p\n", stateid);
10222         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10223         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10224                         &args.seq_args, &res.seq_res);
10225         if (status != NFS_OK) {
10226                 dprintk("NFS reply test_stateid: failed, %d\n", status);
10227                 return status;
10228         }
10229         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10230         return -res.status;
10231 }
10232
10233 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10234                 int err, struct nfs4_exception *exception)
10235 {
10236         exception->retry = 0;
10237         switch(err) {
10238         case -NFS4ERR_DELAY:
10239         case -NFS4ERR_RETRY_UNCACHED_REP:
10240                 nfs4_handle_exception(server, err, exception);
10241                 break;
10242         case -NFS4ERR_BADSESSION:
10243         case -NFS4ERR_BADSLOT:
10244         case -NFS4ERR_BAD_HIGH_SLOT:
10245         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10246         case -NFS4ERR_DEADSESSION:
10247                 nfs4_do_handle_exception(server, err, exception);
10248         }
10249 }
10250
10251 /**
10252  * nfs41_test_stateid - perform a TEST_STATEID operation
10253  *
10254  * @server: server / transport on which to perform the operation
10255  * @stateid: state ID to test
10256  * @cred: credential
10257  *
10258  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10259  * Otherwise a negative NFS4ERR value is returned if the operation
10260  * failed or the state ID is not currently valid.
10261  */
10262 static int nfs41_test_stateid(struct nfs_server *server,
10263                 nfs4_stateid *stateid,
10264                 const struct cred *cred)
10265 {
10266         struct nfs4_exception exception = {
10267                 .interruptible = true,
10268         };
10269         int err;
10270         do {
10271                 err = _nfs41_test_stateid(server, stateid, cred);
10272                 nfs4_handle_delay_or_session_error(server, err, &exception);
10273         } while (exception.retry);
10274         return err;
10275 }
10276
10277 struct nfs_free_stateid_data {
10278         struct nfs_server *server;
10279         struct nfs41_free_stateid_args args;
10280         struct nfs41_free_stateid_res res;
10281 };
10282
10283 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10284 {
10285         struct nfs_free_stateid_data *data = calldata;
10286         nfs4_setup_sequence(data->server->nfs_client,
10287                         &data->args.seq_args,
10288                         &data->res.seq_res,
10289                         task);
10290 }
10291
10292 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10293 {
10294         struct nfs_free_stateid_data *data = calldata;
10295
10296         nfs41_sequence_done(task, &data->res.seq_res);
10297
10298         switch (task->tk_status) {
10299         case -NFS4ERR_DELAY:
10300                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10301                         rpc_restart_call_prepare(task);
10302         }
10303 }
10304
10305 static void nfs41_free_stateid_release(void *calldata)
10306 {
10307         struct nfs_free_stateid_data *data = calldata;
10308         struct nfs_client *clp = data->server->nfs_client;
10309
10310         nfs_put_client(clp);
10311         kfree(calldata);
10312 }
10313
10314 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10315         .rpc_call_prepare = nfs41_free_stateid_prepare,
10316         .rpc_call_done = nfs41_free_stateid_done,
10317         .rpc_release = nfs41_free_stateid_release,
10318 };
10319
10320 /**
10321  * nfs41_free_stateid - perform a FREE_STATEID operation
10322  *
10323  * @server: server / transport on which to perform the operation
10324  * @stateid: state ID to release
10325  * @cred: credential
10326  * @privileged: set to true if this call needs to be privileged
10327  *
10328  * Note: this function is always asynchronous.
10329  */
10330 static int nfs41_free_stateid(struct nfs_server *server,
10331                 const nfs4_stateid *stateid,
10332                 const struct cred *cred,
10333                 bool privileged)
10334 {
10335         struct rpc_message msg = {
10336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10337                 .rpc_cred = cred,
10338         };
10339         struct rpc_task_setup task_setup = {
10340                 .rpc_client = server->client,
10341                 .rpc_message = &msg,
10342                 .callback_ops = &nfs41_free_stateid_ops,
10343                 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10344         };
10345         struct nfs_free_stateid_data *data;
10346         struct rpc_task *task;
10347         struct nfs_client *clp = server->nfs_client;
10348
10349         if (!refcount_inc_not_zero(&clp->cl_count))
10350                 return -EIO;
10351
10352         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10353                 &task_setup.rpc_client, &msg);
10354
10355         dprintk("NFS call  free_stateid %p\n", stateid);
10356         data = kmalloc(sizeof(*data), GFP_KERNEL);
10357         if (!data)
10358                 return -ENOMEM;
10359         data->server = server;
10360         nfs4_stateid_copy(&data->args.stateid, stateid);
10361
10362         task_setup.callback_data = data;
10363
10364         msg.rpc_argp = &data->args;
10365         msg.rpc_resp = &data->res;
10366         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10367         task = rpc_run_task(&task_setup);
10368         if (IS_ERR(task))
10369                 return PTR_ERR(task);
10370         rpc_put_task(task);
10371         return 0;
10372 }
10373
10374 static void
10375 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10376 {
10377         const struct cred *cred = lsp->ls_state->owner->so_cred;
10378
10379         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10380         nfs4_free_lock_state(server, lsp);
10381 }
10382
10383 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10384                 const nfs4_stateid *s2)
10385 {
10386         if (s1->type != s2->type)
10387                 return false;
10388
10389         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10390                 return false;
10391
10392         if (s1->seqid == s2->seqid)
10393                 return true;
10394
10395         return s1->seqid == 0 || s2->seqid == 0;
10396 }
10397
10398 #endif /* CONFIG_NFS_V4_1 */
10399
10400 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10401                 const nfs4_stateid *s2)
10402 {
10403         return nfs4_stateid_match(s1, s2);
10404 }
10405
10406
10407 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10408         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10409         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10410         .recover_open   = nfs4_open_reclaim,
10411         .recover_lock   = nfs4_lock_reclaim,
10412         .establish_clid = nfs4_init_clientid,
10413         .detect_trunking = nfs40_discover_server_trunking,
10414 };
10415
10416 #if defined(CONFIG_NFS_V4_1)
10417 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10418         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10419         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10420         .recover_open   = nfs4_open_reclaim,
10421         .recover_lock   = nfs4_lock_reclaim,
10422         .establish_clid = nfs41_init_clientid,
10423         .reclaim_complete = nfs41_proc_reclaim_complete,
10424         .detect_trunking = nfs41_discover_server_trunking,
10425 };
10426 #endif /* CONFIG_NFS_V4_1 */
10427
10428 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10429         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10430         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10431         .recover_open   = nfs40_open_expired,
10432         .recover_lock   = nfs4_lock_expired,
10433         .establish_clid = nfs4_init_clientid,
10434 };
10435
10436 #if defined(CONFIG_NFS_V4_1)
10437 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10438         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10439         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10440         .recover_open   = nfs41_open_expired,
10441         .recover_lock   = nfs41_lock_expired,
10442         .establish_clid = nfs41_init_clientid,
10443 };
10444 #endif /* CONFIG_NFS_V4_1 */
10445
10446 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10447         .sched_state_renewal = nfs4_proc_async_renew,
10448         .get_state_renewal_cred = nfs4_get_renew_cred,
10449         .renew_lease = nfs4_proc_renew,
10450 };
10451
10452 #if defined(CONFIG_NFS_V4_1)
10453 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10454         .sched_state_renewal = nfs41_proc_async_sequence,
10455         .get_state_renewal_cred = nfs4_get_machine_cred,
10456         .renew_lease = nfs4_proc_sequence,
10457 };
10458 #endif
10459
10460 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10461         .get_locations = _nfs40_proc_get_locations,
10462         .fsid_present = _nfs40_proc_fsid_present,
10463 };
10464
10465 #if defined(CONFIG_NFS_V4_1)
10466 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10467         .get_locations = _nfs41_proc_get_locations,
10468         .fsid_present = _nfs41_proc_fsid_present,
10469 };
10470 #endif  /* CONFIG_NFS_V4_1 */
10471
10472 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10473         .minor_version = 0,
10474         .init_caps = NFS_CAP_READDIRPLUS
10475                 | NFS_CAP_ATOMIC_OPEN
10476                 | NFS_CAP_POSIX_LOCK,
10477         .init_client = nfs40_init_client,
10478         .shutdown_client = nfs40_shutdown_client,
10479         .match_stateid = nfs4_match_stateid,
10480         .find_root_sec = nfs4_find_root_sec,
10481         .free_lock_state = nfs4_release_lockowner,
10482         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10483         .alloc_seqid = nfs_alloc_seqid,
10484         .call_sync_ops = &nfs40_call_sync_ops,
10485         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10486         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10487         .state_renewal_ops = &nfs40_state_renewal_ops,
10488         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10489 };
10490
10491 #if defined(CONFIG_NFS_V4_1)
10492 static struct nfs_seqid *
10493 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10494 {
10495         return NULL;
10496 }
10497
10498 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10499         .minor_version = 1,
10500         .init_caps = NFS_CAP_READDIRPLUS
10501                 | NFS_CAP_ATOMIC_OPEN
10502                 | NFS_CAP_POSIX_LOCK
10503                 | NFS_CAP_STATEID_NFSV41
10504                 | NFS_CAP_ATOMIC_OPEN_V1
10505                 | NFS_CAP_LGOPEN
10506                 | NFS_CAP_MOVEABLE,
10507         .init_client = nfs41_init_client,
10508         .shutdown_client = nfs41_shutdown_client,
10509         .match_stateid = nfs41_match_stateid,
10510         .find_root_sec = nfs41_find_root_sec,
10511         .free_lock_state = nfs41_free_lock_state,
10512         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10513         .alloc_seqid = nfs_alloc_no_seqid,
10514         .session_trunk = nfs4_test_session_trunk,
10515         .call_sync_ops = &nfs41_call_sync_ops,
10516         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10517         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10518         .state_renewal_ops = &nfs41_state_renewal_ops,
10519         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10520 };
10521 #endif
10522
10523 #if defined(CONFIG_NFS_V4_2)
10524 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10525         .minor_version = 2,
10526         .init_caps = NFS_CAP_READDIRPLUS
10527                 | NFS_CAP_ATOMIC_OPEN
10528                 | NFS_CAP_POSIX_LOCK
10529                 | NFS_CAP_STATEID_NFSV41
10530                 | NFS_CAP_ATOMIC_OPEN_V1
10531                 | NFS_CAP_LGOPEN
10532                 | NFS_CAP_ALLOCATE
10533                 | NFS_CAP_COPY
10534                 | NFS_CAP_OFFLOAD_CANCEL
10535                 | NFS_CAP_COPY_NOTIFY
10536                 | NFS_CAP_DEALLOCATE
10537                 | NFS_CAP_SEEK
10538                 | NFS_CAP_LAYOUTSTATS
10539                 | NFS_CAP_CLONE
10540                 | NFS_CAP_LAYOUTERROR
10541                 | NFS_CAP_READ_PLUS
10542                 | NFS_CAP_MOVEABLE,
10543         .init_client = nfs41_init_client,
10544         .shutdown_client = nfs41_shutdown_client,
10545         .match_stateid = nfs41_match_stateid,
10546         .find_root_sec = nfs41_find_root_sec,
10547         .free_lock_state = nfs41_free_lock_state,
10548         .call_sync_ops = &nfs41_call_sync_ops,
10549         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10550         .alloc_seqid = nfs_alloc_no_seqid,
10551         .session_trunk = nfs4_test_session_trunk,
10552         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10553         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10554         .state_renewal_ops = &nfs41_state_renewal_ops,
10555         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10556 };
10557 #endif
10558
10559 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10560         [0] = &nfs_v4_0_minor_ops,
10561 #if defined(CONFIG_NFS_V4_1)
10562         [1] = &nfs_v4_1_minor_ops,
10563 #endif
10564 #if defined(CONFIG_NFS_V4_2)
10565         [2] = &nfs_v4_2_minor_ops,
10566 #endif
10567 };
10568
10569 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10570 {
10571         ssize_t error, error2, error3;
10572
10573         error = generic_listxattr(dentry, list, size);
10574         if (error < 0)
10575                 return error;
10576         if (list) {
10577                 list += error;
10578                 size -= error;
10579         }
10580
10581         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10582         if (error2 < 0)
10583                 return error2;
10584
10585         if (list) {
10586                 list += error2;
10587                 size -= error2;
10588         }
10589
10590         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10591         if (error3 < 0)
10592                 return error3;
10593
10594         return error + error2 + error3;
10595 }
10596
10597 static void nfs4_enable_swap(struct inode *inode)
10598 {
10599         /* The state manager thread must always be running.
10600          * It will notice the client is a swapper, and stay put.
10601          */
10602         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10603
10604         nfs4_schedule_state_manager(clp);
10605 }
10606
10607 static void nfs4_disable_swap(struct inode *inode)
10608 {
10609         /* The state manager thread will now exit once it is
10610          * woken.
10611          */
10612         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10613
10614         nfs4_schedule_state_manager(clp);
10615 }
10616
10617 static const struct inode_operations nfs4_dir_inode_operations = {
10618         .create         = nfs_create,
10619         .lookup         = nfs_lookup,
10620         .atomic_open    = nfs_atomic_open,
10621         .link           = nfs_link,
10622         .unlink         = nfs_unlink,
10623         .symlink        = nfs_symlink,
10624         .mkdir          = nfs_mkdir,
10625         .rmdir          = nfs_rmdir,
10626         .mknod          = nfs_mknod,
10627         .rename         = nfs_rename,
10628         .permission     = nfs_permission,
10629         .getattr        = nfs_getattr,
10630         .setattr        = nfs_setattr,
10631         .listxattr      = nfs4_listxattr,
10632 };
10633
10634 static const struct inode_operations nfs4_file_inode_operations = {
10635         .permission     = nfs_permission,
10636         .getattr        = nfs_getattr,
10637         .setattr        = nfs_setattr,
10638         .listxattr      = nfs4_listxattr,
10639 };
10640
10641 const struct nfs_rpc_ops nfs_v4_clientops = {
10642         .version        = 4,                    /* protocol version */
10643         .dentry_ops     = &nfs4_dentry_operations,
10644         .dir_inode_ops  = &nfs4_dir_inode_operations,
10645         .file_inode_ops = &nfs4_file_inode_operations,
10646         .file_ops       = &nfs4_file_operations,
10647         .getroot        = nfs4_proc_get_root,
10648         .submount       = nfs4_submount,
10649         .try_get_tree   = nfs4_try_get_tree,
10650         .getattr        = nfs4_proc_getattr,
10651         .setattr        = nfs4_proc_setattr,
10652         .lookup         = nfs4_proc_lookup,
10653         .lookupp        = nfs4_proc_lookupp,
10654         .access         = nfs4_proc_access,
10655         .readlink       = nfs4_proc_readlink,
10656         .create         = nfs4_proc_create,
10657         .remove         = nfs4_proc_remove,
10658         .unlink_setup   = nfs4_proc_unlink_setup,
10659         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10660         .unlink_done    = nfs4_proc_unlink_done,
10661         .rename_setup   = nfs4_proc_rename_setup,
10662         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10663         .rename_done    = nfs4_proc_rename_done,
10664         .link           = nfs4_proc_link,
10665         .symlink        = nfs4_proc_symlink,
10666         .mkdir          = nfs4_proc_mkdir,
10667         .rmdir          = nfs4_proc_rmdir,
10668         .readdir        = nfs4_proc_readdir,
10669         .mknod          = nfs4_proc_mknod,
10670         .statfs         = nfs4_proc_statfs,
10671         .fsinfo         = nfs4_proc_fsinfo,
10672         .pathconf       = nfs4_proc_pathconf,
10673         .set_capabilities = nfs4_server_capabilities,
10674         .decode_dirent  = nfs4_decode_dirent,
10675         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10676         .read_setup     = nfs4_proc_read_setup,
10677         .read_done      = nfs4_read_done,
10678         .write_setup    = nfs4_proc_write_setup,
10679         .write_done     = nfs4_write_done,
10680         .commit_setup   = nfs4_proc_commit_setup,
10681         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10682         .commit_done    = nfs4_commit_done,
10683         .lock           = nfs4_proc_lock,
10684         .clear_acl_cache = nfs4_zap_acl_attr,
10685         .close_context  = nfs4_close_context,
10686         .open_context   = nfs4_atomic_open,
10687         .have_delegation = nfs4_have_delegation,
10688         .alloc_client   = nfs4_alloc_client,
10689         .init_client    = nfs4_init_client,
10690         .free_client    = nfs4_free_client,
10691         .create_server  = nfs4_create_server,
10692         .clone_server   = nfs_clone_server,
10693         .discover_trunking = nfs4_discover_trunking,
10694         .enable_swap    = nfs4_enable_swap,
10695         .disable_swap   = nfs4_disable_swap,
10696 };
10697
10698 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10699         .name   = XATTR_NAME_NFSV4_ACL,
10700         .list   = nfs4_xattr_list_nfs4_acl,
10701         .get    = nfs4_xattr_get_nfs4_acl,
10702         .set    = nfs4_xattr_set_nfs4_acl,
10703 };
10704
10705 #if defined(CONFIG_NFS_V4_1)
10706 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10707         .name   = XATTR_NAME_NFSV4_DACL,
10708         .list   = nfs4_xattr_list_nfs4_dacl,
10709         .get    = nfs4_xattr_get_nfs4_dacl,
10710         .set    = nfs4_xattr_set_nfs4_dacl,
10711 };
10712
10713 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10714         .name   = XATTR_NAME_NFSV4_SACL,
10715         .list   = nfs4_xattr_list_nfs4_sacl,
10716         .get    = nfs4_xattr_get_nfs4_sacl,
10717         .set    = nfs4_xattr_set_nfs4_sacl,
10718 };
10719 #endif
10720
10721 #ifdef CONFIG_NFS_V4_2
10722 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10723         .prefix = XATTR_USER_PREFIX,
10724         .get    = nfs4_xattr_get_nfs4_user,
10725         .set    = nfs4_xattr_set_nfs4_user,
10726 };
10727 #endif
10728
10729 const struct xattr_handler *nfs4_xattr_handlers[] = {
10730         &nfs4_xattr_nfs4_acl_handler,
10731 #if defined(CONFIG_NFS_V4_1)
10732         &nfs4_xattr_nfs4_dacl_handler,
10733         &nfs4_xattr_nfs4_sacl_handler,
10734 #endif
10735 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10736         &nfs4_xattr_nfs4_label_handler,
10737 #endif
10738 #ifdef CONFIG_NFS_V4_2
10739         &nfs4_xattr_nfs4_user_handler,
10740 #endif
10741         NULL
10742 };