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