fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.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 "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         if (NFS_SERVER(dir)->nfs_client->cl_minorversion < 2)
 109                 return NULL;
 110
 111         err = security_dentry_init_security(dentry, sattr->ia_mode,
 112                                 &dentry->d_name, (void **)&label->label, &label->len);
 113         if (err == 0)
 114                 return label;
 115
 116         return NULL;
 117 }
 118 static inline void
 119 nfs4_label_release_security(struct nfs4_label *label)
 120 {
 121         if (label)
 122                 security_release_secctx(label->label, label->len);
 123 }
 124 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 125 {
 126         if (label)
 127                 return server->attr_bitmask;
 128
 129         return server->attr_bitmask_nl;
 130 }
 131 #else
 132 static inline struct nfs4_label *
 133 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 134         struct iattr *sattr, struct nfs4_label *l)
 135 { return NULL; }
 136 static inline void
 137 nfs4_label_release_security(struct nfs4_label *label)
 138 { return; }
 139 static inline u32 *
 140 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 141 { return server->attr_bitmask; }
 142 #endif
 143
 144 /* Prevent leaks of NFSv4 errors into userland */
 145 static int nfs4_map_errors(int err)
 146 {
 147         if (err >= -1000)
 148                 return err;
 149         switch (err) {
 150         case -NFS4ERR_RESOURCE:
 151         case -NFS4ERR_LAYOUTTRYLATER:
 152         case -NFS4ERR_RECALLCONFLICT:
 153                 return -EREMOTEIO;
 154         case -NFS4ERR_WRONGSEC:
 155                 return -EPERM;
 156         case -NFS4ERR_BADOWNER:
 157         case -NFS4ERR_BADNAME:
 158                 return -EINVAL;
 159         case -NFS4ERR_SHARE_DENIED:
 160                 return -EACCES;
 161         case -NFS4ERR_MINOR_VERS_MISMATCH:
 162                 return -EPROTONOSUPPORT;
 163         case -NFS4ERR_ACCESS:
 164                 return -EACCES;
 165         case -NFS4ERR_FILE_OPEN:
 166                 return -EBUSY;
 167         default:
 168                 dprintk("%s could not handle NFSv4 error %d\n",
 169                                 __func__, -err);
 170                 break;
 171         }
 172         return -EIO;
 173 }
 174
 175 /*
 176  * This is our standard bitmap for GETATTR requests.
 177  */
 178 const u32 nfs4_fattr_bitmap[3] = {
 179         FATTR4_WORD0_TYPE
 180         | FATTR4_WORD0_CHANGE
 181         | FATTR4_WORD0_SIZE
 182         | FATTR4_WORD0_FSID
 183         | FATTR4_WORD0_FILEID,
 184         FATTR4_WORD1_MODE
 185         | FATTR4_WORD1_NUMLINKS
 186         | FATTR4_WORD1_OWNER
 187         | FATTR4_WORD1_OWNER_GROUP
 188         | FATTR4_WORD1_RAWDEV
 189         | FATTR4_WORD1_SPACE_USED
 190         | FATTR4_WORD1_TIME_ACCESS
 191         | FATTR4_WORD1_TIME_METADATA
 192         | FATTR4_WORD1_TIME_MODIFY,
 193 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 194         FATTR4_WORD2_SECURITY_LABEL
 195 #endif
 196 };
 197
 198 static const u32 nfs4_pnfs_open_bitmap[3] = {
 199         FATTR4_WORD0_TYPE
 200         | FATTR4_WORD0_CHANGE
 201         | FATTR4_WORD0_SIZE
 202         | FATTR4_WORD0_FSID
 203         | FATTR4_WORD0_FILEID,
 204         FATTR4_WORD1_MODE
 205         | FATTR4_WORD1_NUMLINKS
 206         | FATTR4_WORD1_OWNER
 207         | FATTR4_WORD1_OWNER_GROUP
 208         | FATTR4_WORD1_RAWDEV
 209         | FATTR4_WORD1_SPACE_USED
 210         | FATTR4_WORD1_TIME_ACCESS
 211         | FATTR4_WORD1_TIME_METADATA
 212         | FATTR4_WORD1_TIME_MODIFY,
 213         FATTR4_WORD2_MDSTHRESHOLD
 214 };
 215
 216 static const u32 nfs4_open_noattr_bitmap[3] = {
 217         FATTR4_WORD0_TYPE
 218         | FATTR4_WORD0_CHANGE
 219         | FATTR4_WORD0_FILEID,
 220 };
 221
 222 const u32 nfs4_statfs_bitmap[3] = {
 223         FATTR4_WORD0_FILES_AVAIL
 224         | FATTR4_WORD0_FILES_FREE
 225         | FATTR4_WORD0_FILES_TOTAL,
 226         FATTR4_WORD1_SPACE_AVAIL
 227         | FATTR4_WORD1_SPACE_FREE
 228         | FATTR4_WORD1_SPACE_TOTAL
 229 };
 230
 231 const u32 nfs4_pathconf_bitmap[3] = {
 232         FATTR4_WORD0_MAXLINK
 233         | FATTR4_WORD0_MAXNAME,
 234         0
 235 };
 236
 237 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 238                         | FATTR4_WORD0_MAXREAD
 239                         | FATTR4_WORD0_MAXWRITE
 240                         | FATTR4_WORD0_LEASE_TIME,
 241                         FATTR4_WORD1_TIME_DELTA
 242                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 243                         FATTR4_WORD2_LAYOUT_BLKSIZE
 244 };
 245
 246 const u32 nfs4_fs_locations_bitmap[3] = {
 247         FATTR4_WORD0_TYPE
 248         | FATTR4_WORD0_CHANGE
 249         | FATTR4_WORD0_SIZE
 250         | FATTR4_WORD0_FSID
 251         | FATTR4_WORD0_FILEID
 252         | FATTR4_WORD0_FS_LOCATIONS,
 253         FATTR4_WORD1_MODE
 254         | FATTR4_WORD1_NUMLINKS
 255         | FATTR4_WORD1_OWNER
 256         | FATTR4_WORD1_OWNER_GROUP
 257         | FATTR4_WORD1_RAWDEV
 258         | FATTR4_WORD1_SPACE_USED
 259         | FATTR4_WORD1_TIME_ACCESS
 260         | FATTR4_WORD1_TIME_METADATA
 261         | FATTR4_WORD1_TIME_MODIFY
 262         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 263 };
 264
 265 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 266                 struct nfs4_readdir_arg *readdir)
 267 {
 268         __be32 *start, *p;
 269
 270         if (cookie > 2) {
 271                 readdir->cookie = cookie;
 272                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 273                 return;
 274         }
 275
 276         readdir->cookie = 0;
 277         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 278         if (cookie == 2)
 279                 return;
 280
 281         /*
 282          * NFSv4 servers do not return entries for '.' and '..'
 283          * Therefore, we fake these entries here.  We let '.'
 284          * have cookie 0 and '..' have cookie 1.  Note that
 285          * when talking to the server, we always send cookie 0
 286          * instead of 1 or 2.
 287          */
 288         start = p = kmap_atomic(*readdir->pages);
 289
 290         if (cookie == 0) {
 291                 *p++ = xdr_one;                                  /* next */
 292                 *p++ = xdr_zero;                   /* cookie, first word */
 293                 *p++ = xdr_one;                   /* cookie, second word */
 294                 *p++ = xdr_one;                             /* entry len */
 295                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 296                 p++;
 297                 *p++ = xdr_one;                         /* bitmap length */
 298                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 299                 *p++ = htonl(8);              /* attribute buffer length */
 300                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 301         }
 302
 303         *p++ = xdr_one;                                  /* next */
 304         *p++ = xdr_zero;                   /* cookie, first word */
 305         *p++ = xdr_two;                   /* cookie, second word */
 306         *p++ = xdr_two;                             /* entry len */
 307         memcpy(p, "..\0\0", 4);                         /* entry */
 308         p++;
 309         *p++ = xdr_one;                         /* bitmap length */
 310         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 311         *p++ = htonl(8);              /* attribute buffer length */
 312         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 313
 314         readdir->pgbase = (char *)p - (char *)start;
 315         readdir->count -= readdir->pgbase;
 316         kunmap_atomic(start);
 317 }
 318
 319 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 320 {
 321         int res = 0;
 322
 323         might_sleep();
 324
 325         if (*timeout <= 0)
 326                 *timeout = NFS4_POLL_RETRY_MIN;
 327         if (*timeout > NFS4_POLL_RETRY_MAX)
 328                 *timeout = NFS4_POLL_RETRY_MAX;
 329         freezable_schedule_timeout_killable_unsafe(*timeout);
 330         if (fatal_signal_pending(current))
 331                 res = -ERESTARTSYS;
 332         *timeout <<= 1;
 333         return res;
 334 }
 335
 336 /* This is the error handling routine for processes that are allowed
 337  * to sleep.
 338  */
 339 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 340 {
 341         struct nfs_client *clp = server->nfs_client;
 342         struct nfs4_state *state = exception->state;
 343         struct inode *inode = exception->inode;
 344         int ret = errorcode;
 345
 346         exception->retry = 0;
 347         switch(errorcode) {
 348                 case 0:
 349                         return 0;
 350                 case -NFS4ERR_OPENMODE:
 351                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 352                                 nfs4_inode_return_delegation(inode);
 353                                 exception->retry = 1;
 354                                 return 0;
 355                         }
 356                         if (state == NULL)
 357                                 break;
 358                         ret = nfs4_schedule_stateid_recovery(server, state);
 359                         if (ret < 0)
 360                                 break;
 361                         goto wait_on_recovery;
 362                 case -NFS4ERR_DELEG_REVOKED:
 363                 case -NFS4ERR_ADMIN_REVOKED:
 364                 case -NFS4ERR_BAD_STATEID:
 365                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 366                                 nfs_remove_bad_delegation(inode);
 367                                 exception->retry = 1;
 368                                 break;
 369                         }
 370                         if (state == NULL)
 371                                 break;
 372                         ret = nfs4_schedule_stateid_recovery(server, state);
 373                         if (ret < 0)
 374                                 break;
 375                         goto wait_on_recovery;
 376                 case -NFS4ERR_EXPIRED:
 377                         if (state != NULL) {
 378                                 ret = nfs4_schedule_stateid_recovery(server, state);
 379                                 if (ret < 0)
 380                                         break;
 381                         }
 382                 case -NFS4ERR_STALE_STATEID:
 383                 case -NFS4ERR_STALE_CLIENTID:
 384                         nfs4_schedule_lease_recovery(clp);
 385                         goto wait_on_recovery;
 386 #if defined(CONFIG_NFS_V4_1)
 387                 case -NFS4ERR_BADSESSION:
 388                 case -NFS4ERR_BADSLOT:
 389                 case -NFS4ERR_BAD_HIGH_SLOT:
 390                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 391                 case -NFS4ERR_DEADSESSION:
 392                 case -NFS4ERR_SEQ_FALSE_RETRY:
 393                 case -NFS4ERR_SEQ_MISORDERED:
 394                         dprintk("%s ERROR: %d Reset session\n", __func__,
 395                                 errorcode);
 396                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 397                         goto wait_on_recovery;
 398 #endif /* defined(CONFIG_NFS_V4_1) */
 399                 case -NFS4ERR_FILE_OPEN:
 400                         if (exception->timeout > HZ) {
 401                                 /* We have retried a decent amount, time to
 402                                  * fail
 403                                  */
 404                                 ret = -EBUSY;
 405                                 break;
 406                         }
 407                 case -NFS4ERR_GRACE:
 408                 case -NFS4ERR_DELAY:
 409                         ret = nfs4_delay(server->client, &exception->timeout);
 410                         if (ret != 0)
 411                                 break;
 412                 case -NFS4ERR_RETRY_UNCACHED_REP:
 413                 case -NFS4ERR_OLD_STATEID:
 414                         exception->retry = 1;
 415                         break;
 416                 case -NFS4ERR_BADOWNER:
 417                         /* The following works around a Linux server bug! */
 418                 case -NFS4ERR_BADNAME:
 419                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 420                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 421                                 exception->retry = 1;
 422                                 printk(KERN_WARNING "NFS: v4 server %s "
 423                                                 "does not accept raw "
 424                                                 "uid/gids. "
 425                                                 "Reenabling the idmapper.\n",
 426                                                 server->nfs_client->cl_hostname);
 427                         }
 428         }
 429         /* We failed to handle the error */
 430         return nfs4_map_errors(ret);
 431 wait_on_recovery:
 432         ret = nfs4_wait_clnt_recover(clp);
 433         if (ret == 0)
 434                 exception->retry = 1;
 435         return ret;
 436 }
 437
 438 /*
 439  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 440  * or 'false' otherwise.
 441  */
 442 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 443 {
 444         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 445
 446         if (flavor == RPC_AUTH_GSS_KRB5I ||
 447             flavor == RPC_AUTH_GSS_KRB5P)
 448                 return true;
 449
 450         return false;
 451 }
 452
 453 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 454 {
 455         spin_lock(&clp->cl_lock);
 456         if (time_before(clp->cl_last_renewal,timestamp))
 457                 clp->cl_last_renewal = timestamp;
 458         spin_unlock(&clp->cl_lock);
 459 }
 460
 461 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 462 {
 463         do_renew_lease(server->nfs_client, timestamp);
 464 }
 465
 466 struct nfs4_call_sync_data {
 467         const struct nfs_server *seq_server;
 468         struct nfs4_sequence_args *seq_args;
 469         struct nfs4_sequence_res *seq_res;
 470 };
 471
 472 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 473                                struct nfs4_sequence_res *res, int cache_reply)
 474 {
 475         args->sa_slot = NULL;
 476         args->sa_cache_this = cache_reply;
 477         args->sa_privileged = 0;
 478
 479         res->sr_slot = NULL;
 480 }
 481
 482 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 483 {
 484         args->sa_privileged = 1;
 485 }
 486
 487 static int nfs40_setup_sequence(const struct nfs_server *server,
 488                                 struct nfs4_sequence_args *args,
 489                                 struct nfs4_sequence_res *res,
 490                                 struct rpc_task *task)
 491 {
 492         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 493         struct nfs4_slot *slot;
 494
 495         /* slot already allocated? */
 496         if (res->sr_slot != NULL)
 497                 goto out_start;
 498
 499         spin_lock(&tbl->slot_tbl_lock);
 500         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 501                 goto out_sleep;
 502
 503         slot = nfs4_alloc_slot(tbl);
 504         if (IS_ERR(slot)) {
 505                 if (slot == ERR_PTR(-ENOMEM))
 506                         task->tk_timeout = HZ >> 2;
 507                 goto out_sleep;
 508         }
 509         spin_unlock(&tbl->slot_tbl_lock);
 510
 511         args->sa_slot = slot;
 512         res->sr_slot = slot;
 513
 514 out_start:
 515         rpc_call_start(task);
 516         return 0;
 517
 518 out_sleep:
 519         if (args->sa_privileged)
 520                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 521                                 NULL, RPC_PRIORITY_PRIVILEGED);
 522         else
 523                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 524         spin_unlock(&tbl->slot_tbl_lock);
 525         return -EAGAIN;
 526 }
 527
 528 static int nfs40_sequence_done(struct rpc_task *task,
 529                                struct nfs4_sequence_res *res)
 530 {
 531         struct nfs4_slot *slot = res->sr_slot;
 532         struct nfs4_slot_table *tbl;
 533
 534         if (!RPC_WAS_SENT(task))
 535                 goto out;
 536
 537         tbl = slot->table;
 538         spin_lock(&tbl->slot_tbl_lock);
 539         if (!nfs41_wake_and_assign_slot(tbl, slot))
 540                 nfs4_free_slot(tbl, slot);
 541         spin_unlock(&tbl->slot_tbl_lock);
 542
 543         res->sr_slot = NULL;
 544 out:
 545         return 1;
 546 }
 547
 548 #if defined(CONFIG_NFS_V4_1)
 549
 550 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 551 {
 552         struct nfs4_session *session;
 553         struct nfs4_slot_table *tbl;
 554         bool send_new_highest_used_slotid = false;
 555
 556         if (!res->sr_slot) {
 557                 /* just wake up the next guy waiting since
 558                  * we may have not consumed a slot after all */
 559                 dprintk("%s: No slot\n", __func__);
 560                 return;
 561         }
 562         tbl = res->sr_slot->table;
 563         session = tbl->session;
 564
 565         spin_lock(&tbl->slot_tbl_lock);
 566         /* Be nice to the server: try to ensure that the last transmitted
 567          * value for highest_user_slotid <= target_highest_slotid
 568          */
 569         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 570                 send_new_highest_used_slotid = true;
 571
 572         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 573                 send_new_highest_used_slotid = false;
 574                 goto out_unlock;
 575         }
 576         nfs4_free_slot(tbl, res->sr_slot);
 577
 578         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 579                 send_new_highest_used_slotid = false;
 580 out_unlock:
 581         spin_unlock(&tbl->slot_tbl_lock);
 582         res->sr_slot = NULL;
 583         if (send_new_highest_used_slotid)
 584                 nfs41_server_notify_highest_slotid_update(session->clp);
 585 }
 586
 587 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 588 {
 589         struct nfs4_session *session;
 590         struct nfs4_slot *slot;
 591         struct nfs_client *clp;
 592         bool interrupted = false;
 593         int ret = 1;
 594
 595         /* don't increment the sequence number if the task wasn't sent */
 596         if (!RPC_WAS_SENT(task))
 597                 goto out;
 598
 599         slot = res->sr_slot;
 600         session = slot->table->session;
 601
 602         if (slot->interrupted) {
 603                 slot->interrupted = 0;
 604                 interrupted = true;
 605         }
 606
 607         trace_nfs4_sequence_done(session, res);
 608         /* Check the SEQUENCE operation status */
 609         switch (res->sr_status) {
 610         case 0:
 611                 /* Update the slot's sequence and clientid lease timer */
 612                 ++slot->seq_nr;
 613                 clp = session->clp;
 614                 do_renew_lease(clp, res->sr_timestamp);
 615                 /* Check sequence flags */
 616                 if (res->sr_status_flags != 0)
 617                         nfs4_schedule_lease_recovery(clp);
 618                 nfs41_update_target_slotid(slot->table, slot, res);
 619                 break;
 620         case 1:
 621                 /*
 622                  * sr_status remains 1 if an RPC level error occurred.
 623                  * The server may or may not have processed the sequence
 624                  * operation..
 625                  * Mark the slot as having hosted an interrupted RPC call.
 626                  */
 627                 slot->interrupted = 1;
 628                 goto out;
 629         case -NFS4ERR_DELAY:
 630                 /* The server detected a resend of the RPC call and
 631                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 632                  * of RFC5661.
 633                  */
 634                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 635                         __func__,
 636                         slot->slot_nr,
 637                         slot->seq_nr);
 638                 goto out_retry;
 639         case -NFS4ERR_BADSLOT:
 640                 /*
 641                  * The slot id we used was probably retired. Try again
 642                  * using a different slot id.
 643                  */
 644                 goto retry_nowait;
 645         case -NFS4ERR_SEQ_MISORDERED:
 646                 /*
 647                  * Was the last operation on this sequence interrupted?
 648                  * If so, retry after bumping the sequence number.
 649                  */
 650                 if (interrupted) {
 651                         ++slot->seq_nr;
 652                         goto retry_nowait;
 653                 }
 654                 /*
 655                  * Could this slot have been previously retired?
 656                  * If so, then the server may be expecting seq_nr = 1!
 657                  */
 658                 if (slot->seq_nr != 1) {
 659                         slot->seq_nr = 1;
 660                         goto retry_nowait;
 661                 }
 662                 break;
 663         case -NFS4ERR_SEQ_FALSE_RETRY:
 664                 ++slot->seq_nr;
 665                 goto retry_nowait;
 666         default:
 667                 /* Just update the slot sequence no. */
 668                 ++slot->seq_nr;
 669         }
 670 out:
 671         /* The session may be reset by one of the error handlers. */
 672         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 673         nfs41_sequence_free_slot(res);
 674         return ret;
 675 retry_nowait:
 676         if (rpc_restart_call_prepare(task)) {
 677                 task->tk_status = 0;
 678                 ret = 0;
 679         }
 680         goto out;
 681 out_retry:
 682         if (!rpc_restart_call(task))
 683                 goto out;
 684         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 685         return 0;
 686 }
 687
 688 static int nfs4_sequence_done(struct rpc_task *task,
 689                                struct nfs4_sequence_res *res)
 690 {
 691         if (res->sr_slot == NULL)
 692                 return 1;
 693         if (!res->sr_slot->table->session)
 694                 return nfs40_sequence_done(task, res);
 695         return nfs41_sequence_done(task, res);
 696 }
 697
 698 int nfs41_setup_sequence(struct nfs4_session *session,
 699                                 struct nfs4_sequence_args *args,
 700                                 struct nfs4_sequence_res *res,
 701                                 struct rpc_task *task)
 702 {
 703         struct nfs4_slot *slot;
 704         struct nfs4_slot_table *tbl;
 705
 706         dprintk("--> %s\n", __func__);
 707         /* slot already allocated? */
 708         if (res->sr_slot != NULL)
 709                 goto out_success;
 710
 711         tbl = &session->fc_slot_table;
 712
 713         task->tk_timeout = 0;
 714
 715         spin_lock(&tbl->slot_tbl_lock);
 716         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 717             !args->sa_privileged) {
 718                 /* The state manager will wait until the slot table is empty */
 719                 dprintk("%s session is draining\n", __func__);
 720                 goto out_sleep;
 721         }
 722
 723         slot = nfs4_alloc_slot(tbl);
 724         if (IS_ERR(slot)) {
 725                 /* If out of memory, try again in 1/4 second */
 726                 if (slot == ERR_PTR(-ENOMEM))
 727                         task->tk_timeout = HZ >> 2;
 728                 dprintk("<-- %s: no free slots\n", __func__);
 729                 goto out_sleep;
 730         }
 731         spin_unlock(&tbl->slot_tbl_lock);
 732
 733         args->sa_slot = slot;
 734
 735         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 736                         slot->slot_nr, slot->seq_nr);
 737
 738         res->sr_slot = slot;
 739         res->sr_timestamp = jiffies;
 740         res->sr_status_flags = 0;
 741         /*
 742          * sr_status is only set in decode_sequence, and so will remain
 743          * set to 1 if an rpc level failure occurs.
 744          */
 745         res->sr_status = 1;
 746         trace_nfs4_setup_sequence(session, args);
 747 out_success:
 748         rpc_call_start(task);
 749         return 0;
 750 out_sleep:
 751         /* Privileged tasks are queued with top priority */
 752         if (args->sa_privileged)
 753                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 754                                 NULL, RPC_PRIORITY_PRIVILEGED);
 755         else
 756                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 757         spin_unlock(&tbl->slot_tbl_lock);
 758         return -EAGAIN;
 759 }
 760 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 761
 762 static int nfs4_setup_sequence(const struct nfs_server *server,
 763                                struct nfs4_sequence_args *args,
 764                                struct nfs4_sequence_res *res,
 765                                struct rpc_task *task)
 766 {
 767         struct nfs4_session *session = nfs4_get_session(server);
 768         int ret = 0;
 769
 770         if (!session)
 771                 return nfs40_setup_sequence(server, args, res, task);
 772
 773         dprintk("--> %s clp %p session %p sr_slot %u\n",
 774                 __func__, session->clp, session, res->sr_slot ?
 775                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 776
 777         ret = nfs41_setup_sequence(session, args, res, task);
 778
 779         dprintk("<-- %s status=%d\n", __func__, ret);
 780         return ret;
 781 }
 782
 783 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 784 {
 785         struct nfs4_call_sync_data *data = calldata;
 786         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 787
 788         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 789
 790         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 791 }
 792
 793 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 794 {
 795         struct nfs4_call_sync_data *data = calldata;
 796
 797         nfs41_sequence_done(task, data->seq_res);
 798 }
 799
 800 static const struct rpc_call_ops nfs41_call_sync_ops = {
 801         .rpc_call_prepare = nfs41_call_sync_prepare,
 802         .rpc_call_done = nfs41_call_sync_done,
 803 };
 804
 805 #else   /* !CONFIG_NFS_V4_1 */
 806
 807 static int nfs4_setup_sequence(const struct nfs_server *server,
 808                                struct nfs4_sequence_args *args,
 809                                struct nfs4_sequence_res *res,
 810                                struct rpc_task *task)
 811 {
 812         return nfs40_setup_sequence(server, args, res, task);
 813 }
 814
 815 static int nfs4_sequence_done(struct rpc_task *task,
 816                                struct nfs4_sequence_res *res)
 817 {
 818         return nfs40_sequence_done(task, res);
 819 }
 820
 821 #endif  /* !CONFIG_NFS_V4_1 */
 822
 823 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 824 {
 825         struct nfs4_call_sync_data *data = calldata;
 826         nfs4_setup_sequence(data->seq_server,
 827                                 data->seq_args, data->seq_res, task);
 828 }
 829
 830 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 831 {
 832         struct nfs4_call_sync_data *data = calldata;
 833         nfs4_sequence_done(task, data->seq_res);
 834 }
 835
 836 static const struct rpc_call_ops nfs40_call_sync_ops = {
 837         .rpc_call_prepare = nfs40_call_sync_prepare,
 838         .rpc_call_done = nfs40_call_sync_done,
 839 };
 840
 841 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 842                                    struct nfs_server *server,
 843                                    struct rpc_message *msg,
 844                                    struct nfs4_sequence_args *args,
 845                                    struct nfs4_sequence_res *res)
 846 {
 847         int ret;
 848         struct rpc_task *task;
 849         struct nfs_client *clp = server->nfs_client;
 850         struct nfs4_call_sync_data data = {
 851                 .seq_server = server,
 852                 .seq_args = args,
 853                 .seq_res = res,
 854         };
 855         struct rpc_task_setup task_setup = {
 856                 .rpc_client = clnt,
 857                 .rpc_message = msg,
 858                 .callback_ops = clp->cl_mvops->call_sync_ops,
 859                 .callback_data = &data
 860         };
 861
 862         task = rpc_run_task(&task_setup);
 863         if (IS_ERR(task))
 864                 ret = PTR_ERR(task);
 865         else {
 866                 ret = task->tk_status;
 867                 rpc_put_task(task);
 868         }
 869         return ret;
 870 }
 871
 872 static
 873 int nfs4_call_sync(struct rpc_clnt *clnt,
 874                    struct nfs_server *server,
 875                    struct rpc_message *msg,
 876                    struct nfs4_sequence_args *args,
 877                    struct nfs4_sequence_res *res,
 878                    int cache_reply)
 879 {
 880         nfs4_init_sequence(args, res, cache_reply);
 881         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 882 }
 883
 884 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 885 {
 886         struct nfs_inode *nfsi = NFS_I(dir);
 887
 888         spin_lock(&dir->i_lock);
 889         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 890         if (!cinfo->atomic || cinfo->before != dir->i_version)
 891                 nfs_force_lookup_revalidate(dir);
 892         dir->i_version = cinfo->after;
 893         nfs_fscache_invalidate(dir);
 894         spin_unlock(&dir->i_lock);
 895 }
 896
 897 struct nfs4_opendata {
 898         struct kref kref;
 899         struct nfs_openargs o_arg;
 900         struct nfs_openres o_res;
 901         struct nfs_open_confirmargs c_arg;
 902         struct nfs_open_confirmres c_res;
 903         struct nfs4_string owner_name;
 904         struct nfs4_string group_name;
 905         struct nfs_fattr f_attr;
 906         struct nfs4_label *f_label;
 907         struct dentry *dir;
 908         struct dentry *dentry;
 909         struct nfs4_state_owner *owner;
 910         struct nfs4_state *state;
 911         struct iattr attrs;
 912         unsigned long timestamp;
 913         unsigned int rpc_done : 1;
 914         unsigned int is_recover : 1;
 915         int rpc_status;
 916         int cancelled;
 917 };
 918
 919 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 920                 int err, struct nfs4_exception *exception)
 921 {
 922         if (err != -EINVAL)
 923                 return false;
 924         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 925                 return false;
 926         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 927         exception->retry = 1;
 928         return true;
 929 }
 930
 931 static enum open_claim_type4
 932 nfs4_map_atomic_open_claim(struct nfs_server *server,
 933                 enum open_claim_type4 claim)
 934 {
 935         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 936                 return claim;
 937         switch (claim) {
 938         default:
 939                 return claim;
 940         case NFS4_OPEN_CLAIM_FH:
 941                 return NFS4_OPEN_CLAIM_NULL;
 942         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 943                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 944         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 945                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 946         }
 947 }
 948
 949 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 950 {
 951         p->o_res.f_attr = &p->f_attr;
 952         p->o_res.f_label = p->f_label;
 953         p->o_res.seqid = p->o_arg.seqid;
 954         p->c_res.seqid = p->c_arg.seqid;
 955         p->o_res.server = p->o_arg.server;
 956         p->o_res.access_request = p->o_arg.access;
 957         nfs_fattr_init(&p->f_attr);
 958         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 959 }
 960
 961 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 962                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 963                 const struct iattr *attrs,
 964                 struct nfs4_label *label,
 965                 enum open_claim_type4 claim,
 966                 gfp_t gfp_mask)
 967 {
 968         struct dentry *parent = dget_parent(dentry);
 969         struct inode *dir = parent->d_inode;
 970         struct nfs_server *server = NFS_SERVER(dir);
 971         struct nfs4_opendata *p;
 972
 973         p = kzalloc(sizeof(*p), gfp_mask);
 974         if (p == NULL)
 975                 goto err;
 976
 977         p->f_label = nfs4_label_alloc(server, gfp_mask);
 978         if (IS_ERR(p->f_label))
 979                 goto err_free_p;
 980
 981         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 982         if (p->o_arg.seqid == NULL)
 983                 goto err_free_label;
 984         nfs_sb_active(dentry->d_sb);
 985         p->dentry = dget(dentry);
 986         p->dir = parent;
 987         p->owner = sp;
 988         atomic_inc(&sp->so_count);
 989         p->o_arg.open_flags = flags;
 990         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 991         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 992          * will return permission denied for all bits until close */
 993         if (!(flags & O_EXCL)) {
 994                 /* ask server to check for all possible rights as results
 995                  * are cached */
 996                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 997                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 998         }
 999         p->o_arg.clientid = server->nfs_client->cl_clientid;
1000         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1001         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1002         p->o_arg.name = &dentry->d_name;
1003         p->o_arg.server = server;
1004         p->o_arg.bitmask = nfs4_bitmask(server, label);
1005         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1006         p->o_arg.label = label;
1007         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1008         switch (p->o_arg.claim) {
1009         case NFS4_OPEN_CLAIM_NULL:
1010         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1011         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1012                 p->o_arg.fh = NFS_FH(dir);
1013                 break;
1014         case NFS4_OPEN_CLAIM_PREVIOUS:
1015         case NFS4_OPEN_CLAIM_FH:
1016         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1017         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1018                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1019         }
1020         if (attrs != NULL && attrs->ia_valid != 0) {
1021                 __u32 verf[2];
1022
1023                 p->o_arg.u.attrs = &p->attrs;
1024                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1025
1026                 verf[0] = jiffies;
1027                 verf[1] = current->pid;
1028                 memcpy(p->o_arg.u.verifier.data, verf,
1029                                 sizeof(p->o_arg.u.verifier.data));
1030         }
1031         p->c_arg.fh = &p->o_res.fh;
1032         p->c_arg.stateid = &p->o_res.stateid;
1033         p->c_arg.seqid = p->o_arg.seqid;
1034         nfs4_init_opendata_res(p);
1035         kref_init(&p->kref);
1036         return p;
1037
1038 err_free_label:
1039         nfs4_label_free(p->f_label);
1040 err_free_p:
1041         kfree(p);
1042 err:
1043         dput(parent);
1044         return NULL;
1045 }
1046
1047 static void nfs4_opendata_free(struct kref *kref)
1048 {
1049         struct nfs4_opendata *p = container_of(kref,
1050                         struct nfs4_opendata, kref);
1051         struct super_block *sb = p->dentry->d_sb;
1052
1053         nfs_free_seqid(p->o_arg.seqid);
1054         if (p->state != NULL)
1055                 nfs4_put_open_state(p->state);
1056         nfs4_put_state_owner(p->owner);
1057
1058         nfs4_label_free(p->f_label);
1059
1060         dput(p->dir);
1061         dput(p->dentry);
1062         nfs_sb_deactive(sb);
1063         nfs_fattr_free_names(&p->f_attr);
1064         kfree(p);
1065 }
1066
1067 static void nfs4_opendata_put(struct nfs4_opendata *p)
1068 {
1069         if (p != NULL)
1070                 kref_put(&p->kref, nfs4_opendata_free);
1071 }
1072
1073 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1074 {
1075         int ret;
1076
1077         ret = rpc_wait_for_completion_task(task);
1078         return ret;
1079 }
1080
1081 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1082 {
1083         int ret = 0;
1084
1085         if (open_mode & (O_EXCL|O_TRUNC))
1086                 goto out;
1087         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1088                 case FMODE_READ:
1089                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1090                                 && state->n_rdonly != 0;
1091                         break;
1092                 case FMODE_WRITE:
1093                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1094                                 && state->n_wronly != 0;
1095                         break;
1096                 case FMODE_READ|FMODE_WRITE:
1097                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1098                                 && state->n_rdwr != 0;
1099         }
1100 out:
1101         return ret;
1102 }
1103
1104 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1105 {
1106         if (delegation == NULL)
1107                 return 0;
1108         if ((delegation->type & fmode) != fmode)
1109                 return 0;
1110         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1111                 return 0;
1112         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1113                 return 0;
1114         nfs_mark_delegation_referenced(delegation);
1115         return 1;
1116 }
1117
1118 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1119 {
1120         switch (fmode) {
1121                 case FMODE_WRITE:
1122                         state->n_wronly++;
1123                         break;
1124                 case FMODE_READ:
1125                         state->n_rdonly++;
1126                         break;
1127                 case FMODE_READ|FMODE_WRITE:
1128                         state->n_rdwr++;
1129         }
1130         nfs4_state_set_mode_locked(state, state->state | fmode);
1131 }
1132
1133 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1134 {
1135         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1136                 nfs4_stateid_copy(&state->stateid, stateid);
1137         nfs4_stateid_copy(&state->open_stateid, stateid);
1138         set_bit(NFS_OPEN_STATE, &state->flags);
1139         switch (fmode) {
1140                 case FMODE_READ:
1141                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1142                         break;
1143                 case FMODE_WRITE:
1144                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1145                         break;
1146                 case FMODE_READ|FMODE_WRITE:
1147                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1148         }
1149 }
1150
1151 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1152 {
1153         write_seqlock(&state->seqlock);
1154         nfs_set_open_stateid_locked(state, stateid, fmode);
1155         write_sequnlock(&state->seqlock);
1156 }
1157
1158 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1159 {
1160         /*
1161          * Protect the call to nfs4_state_set_mode_locked and
1162          * serialise the stateid update
1163          */
1164         write_seqlock(&state->seqlock);
1165         if (deleg_stateid != NULL) {
1166                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1167                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1168         }
1169         if (open_stateid != NULL)
1170                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1171         write_sequnlock(&state->seqlock);
1172         spin_lock(&state->owner->so_lock);
1173         update_open_stateflags(state, fmode);
1174         spin_unlock(&state->owner->so_lock);
1175 }
1176
1177 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1178 {
1179         struct nfs_inode *nfsi = NFS_I(state->inode);
1180         struct nfs_delegation *deleg_cur;
1181         int ret = 0;
1182
1183         fmode &= (FMODE_READ|FMODE_WRITE);
1184
1185         rcu_read_lock();
1186         deleg_cur = rcu_dereference(nfsi->delegation);
1187         if (deleg_cur == NULL)
1188                 goto no_delegation;
1189
1190         spin_lock(&deleg_cur->lock);
1191         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1192            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1193             (deleg_cur->type & fmode) != fmode)
1194                 goto no_delegation_unlock;
1195
1196         if (delegation == NULL)
1197                 delegation = &deleg_cur->stateid;
1198         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1199                 goto no_delegation_unlock;
1200
1201         nfs_mark_delegation_referenced(deleg_cur);
1202         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1203         ret = 1;
1204 no_delegation_unlock:
1205         spin_unlock(&deleg_cur->lock);
1206 no_delegation:
1207         rcu_read_unlock();
1208
1209         if (!ret && open_stateid != NULL) {
1210                 __update_open_stateid(state, open_stateid, NULL, fmode);
1211                 ret = 1;
1212         }
1213
1214         return ret;
1215 }
1216
1217
1218 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1219 {
1220         struct nfs_delegation *delegation;
1221
1222         rcu_read_lock();
1223         delegation = rcu_dereference(NFS_I(inode)->delegation);
1224         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1225                 rcu_read_unlock();
1226                 return;
1227         }
1228         rcu_read_unlock();
1229         nfs4_inode_return_delegation(inode);
1230 }
1231
1232 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1233 {
1234         struct nfs4_state *state = opendata->state;
1235         struct nfs_inode *nfsi = NFS_I(state->inode);
1236         struct nfs_delegation *delegation;
1237         int open_mode = opendata->o_arg.open_flags;
1238         fmode_t fmode = opendata->o_arg.fmode;
1239         nfs4_stateid stateid;
1240         int ret = -EAGAIN;
1241
1242         for (;;) {
1243                 if (can_open_cached(state, fmode, open_mode)) {
1244                         spin_lock(&state->owner->so_lock);
1245                         if (can_open_cached(state, fmode, open_mode)) {
1246                                 update_open_stateflags(state, fmode);
1247                                 spin_unlock(&state->owner->so_lock);
1248                                 goto out_return_state;
1249                         }
1250                         spin_unlock(&state->owner->so_lock);
1251                 }
1252                 rcu_read_lock();
1253                 delegation = rcu_dereference(nfsi->delegation);
1254                 if (!can_open_delegated(delegation, fmode)) {
1255                         rcu_read_unlock();
1256                         break;
1257                 }
1258                 /* Save the delegation */
1259                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1260                 rcu_read_unlock();
1261                 nfs_release_seqid(opendata->o_arg.seqid);
1262                 if (!opendata->is_recover) {
1263                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1264                         if (ret != 0)
1265                                 goto out;
1266                 }
1267                 ret = -EAGAIN;
1268
1269                 /* Try to update the stateid using the delegation */
1270                 if (update_open_stateid(state, NULL, &stateid, fmode))
1271                         goto out_return_state;
1272         }
1273 out:
1274         return ERR_PTR(ret);
1275 out_return_state:
1276         atomic_inc(&state->count);
1277         return state;
1278 }
1279
1280 static void
1281 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1282 {
1283         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1284         struct nfs_delegation *delegation;
1285         int delegation_flags = 0;
1286
1287         rcu_read_lock();
1288         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1289         if (delegation)
1290                 delegation_flags = delegation->flags;
1291         rcu_read_unlock();
1292         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1293                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1294                                    "returning a delegation for "
1295                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1296                                    clp->cl_hostname);
1297         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1298                 nfs_inode_set_delegation(state->inode,
1299                                          data->owner->so_cred,
1300                                          &data->o_res);
1301         else
1302                 nfs_inode_reclaim_delegation(state->inode,
1303                                              data->owner->so_cred,
1304                                              &data->o_res);
1305 }
1306
1307 /*
1308  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1309  * and update the nfs4_state.
1310  */
1311 static struct nfs4_state *
1312 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1313 {
1314         struct inode *inode = data->state->inode;
1315         struct nfs4_state *state = data->state;
1316         int ret;
1317
1318         if (!data->rpc_done) {
1319                 ret = data->rpc_status;
1320                 goto err;
1321         }
1322
1323         ret = -ESTALE;
1324         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1325             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1326             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1327                 goto err;
1328
1329         ret = -ENOMEM;
1330         state = nfs4_get_open_state(inode, data->owner);
1331         if (state == NULL)
1332                 goto err;
1333
1334         ret = nfs_refresh_inode(inode, &data->f_attr);
1335         if (ret)
1336                 goto err;
1337
1338         nfs_setsecurity(inode, &data->f_attr, data->f_label);
1339
1340         if (data->o_res.delegation_type != 0)
1341                 nfs4_opendata_check_deleg(data, state);
1342         update_open_stateid(state, &data->o_res.stateid, NULL,
1343                             data->o_arg.fmode);
1344
1345         return state;
1346 err:
1347         return ERR_PTR(ret);
1348
1349 }
1350
1351 static struct nfs4_state *
1352 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1353 {
1354         struct inode *inode;
1355         struct nfs4_state *state = NULL;
1356         int ret;
1357
1358         if (!data->rpc_done) {
1359                 state = nfs4_try_open_cached(data);
1360                 goto out;
1361         }
1362
1363         ret = -EAGAIN;
1364         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1365                 goto err;
1366         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1367         ret = PTR_ERR(inode);
1368         if (IS_ERR(inode))
1369                 goto err;
1370         ret = -ENOMEM;
1371         state = nfs4_get_open_state(inode, data->owner);
1372         if (state == NULL)
1373                 goto err_put_inode;
1374         if (data->o_res.delegation_type != 0)
1375                 nfs4_opendata_check_deleg(data, state);
1376         update_open_stateid(state, &data->o_res.stateid, NULL,
1377                         data->o_arg.fmode);
1378         iput(inode);
1379 out:
1380         nfs_release_seqid(data->o_arg.seqid);
1381         return state;
1382 err_put_inode:
1383         iput(inode);
1384 err:
1385         return ERR_PTR(ret);
1386 }
1387
1388 static struct nfs4_state *
1389 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1390 {
1391         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1392                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1393         return _nfs4_opendata_to_nfs4_state(data);
1394 }
1395
1396 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1397 {
1398         struct nfs_inode *nfsi = NFS_I(state->inode);
1399         struct nfs_open_context *ctx;
1400
1401         spin_lock(&state->inode->i_lock);
1402         list_for_each_entry(ctx, &nfsi->open_files, list) {
1403                 if (ctx->state != state)
1404                         continue;
1405                 get_nfs_open_context(ctx);
1406                 spin_unlock(&state->inode->i_lock);
1407                 return ctx;
1408         }
1409         spin_unlock(&state->inode->i_lock);
1410         return ERR_PTR(-ENOENT);
1411 }
1412
1413 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1414                 struct nfs4_state *state, enum open_claim_type4 claim)
1415 {
1416         struct nfs4_opendata *opendata;
1417
1418         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1419                         NULL, NULL, claim, GFP_NOFS);
1420         if (opendata == NULL)
1421                 return ERR_PTR(-ENOMEM);
1422         opendata->state = state;
1423         atomic_inc(&state->count);
1424         return opendata;
1425 }
1426
1427 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1428 {
1429         struct nfs4_state *newstate;
1430         int ret;
1431
1432         opendata->o_arg.open_flags = 0;
1433         opendata->o_arg.fmode = fmode;
1434         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1435         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1436         nfs4_init_opendata_res(opendata);
1437         ret = _nfs4_recover_proc_open(opendata);
1438         if (ret != 0)
1439                 return ret;
1440         newstate = nfs4_opendata_to_nfs4_state(opendata);
1441         if (IS_ERR(newstate))
1442                 return PTR_ERR(newstate);
1443         nfs4_close_state(newstate, fmode);
1444         *res = newstate;
1445         return 0;
1446 }
1447
1448 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1449 {
1450         struct nfs4_state *newstate;
1451         int ret;
1452
1453         /* memory barrier prior to reading state->n_* */
1454         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1455         clear_bit(NFS_OPEN_STATE, &state->flags);
1456         smp_rmb();
1457         if (state->n_rdwr != 0) {
1458                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1459                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1460                 if (ret != 0)
1461                         return ret;
1462                 if (newstate != state)
1463                         return -ESTALE;
1464         }
1465         if (state->n_wronly != 0) {
1466                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1467                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1468                 if (ret != 0)
1469                         return ret;
1470                 if (newstate != state)
1471                         return -ESTALE;
1472         }
1473         if (state->n_rdonly != 0) {
1474                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1475                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1476                 if (ret != 0)
1477                         return ret;
1478                 if (newstate != state)
1479                         return -ESTALE;
1480         }
1481         /*
1482          * We may have performed cached opens for all three recoveries.
1483          * Check if we need to update the current stateid.
1484          */
1485         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1486             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1487                 write_seqlock(&state->seqlock);
1488                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1489                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1490                 write_sequnlock(&state->seqlock);
1491         }
1492         return 0;
1493 }
1494
1495 /*
1496  * OPEN_RECLAIM:
1497  *      reclaim state on the server after a reboot.
1498  */
1499 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1500 {
1501         struct nfs_delegation *delegation;
1502         struct nfs4_opendata *opendata;
1503         fmode_t delegation_type = 0;
1504         int status;
1505
1506         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1507                         NFS4_OPEN_CLAIM_PREVIOUS);
1508         if (IS_ERR(opendata))
1509                 return PTR_ERR(opendata);
1510         rcu_read_lock();
1511         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1512         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1513                 delegation_type = delegation->type;
1514         rcu_read_unlock();
1515         opendata->o_arg.u.delegation_type = delegation_type;
1516         status = nfs4_open_recover(opendata, state);
1517         nfs4_opendata_put(opendata);
1518         return status;
1519 }
1520
1521 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1522 {
1523         struct nfs_server *server = NFS_SERVER(state->inode);
1524         struct nfs4_exception exception = { };
1525         int err;
1526         do {
1527                 err = _nfs4_do_open_reclaim(ctx, state);
1528                 trace_nfs4_open_reclaim(ctx, 0, err);
1529                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1530                         continue;
1531                 if (err != -NFS4ERR_DELAY)
1532                         break;
1533                 nfs4_handle_exception(server, err, &exception);
1534         } while (exception.retry);
1535         return err;
1536 }
1537
1538 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1539 {
1540         struct nfs_open_context *ctx;
1541         int ret;
1542
1543         ctx = nfs4_state_find_open_context(state);
1544         if (IS_ERR(ctx))
1545                 return -EAGAIN;
1546         ret = nfs4_do_open_reclaim(ctx, state);
1547         put_nfs_open_context(ctx);
1548         return ret;
1549 }
1550
1551 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1552 {
1553         switch (err) {
1554                 default:
1555                         printk(KERN_ERR "NFS: %s: unhandled error "
1556                                         "%d.\n", __func__, err);
1557                 case 0:
1558                 case -ENOENT:
1559                 case -ESTALE:
1560                         break;
1561                 case -NFS4ERR_BADSESSION:
1562                 case -NFS4ERR_BADSLOT:
1563                 case -NFS4ERR_BAD_HIGH_SLOT:
1564                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1565                 case -NFS4ERR_DEADSESSION:
1566                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1567                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1568                         return -EAGAIN;
1569                 case -NFS4ERR_STALE_CLIENTID:
1570                 case -NFS4ERR_STALE_STATEID:
1571                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1572                 case -NFS4ERR_EXPIRED:
1573                         /* Don't recall a delegation if it was lost */
1574                         nfs4_schedule_lease_recovery(server->nfs_client);
1575                         return -EAGAIN;
1576                 case -NFS4ERR_DELEG_REVOKED:
1577                 case -NFS4ERR_ADMIN_REVOKED:
1578                 case -NFS4ERR_BAD_STATEID:
1579                 case -NFS4ERR_OPENMODE:
1580                         nfs_inode_find_state_and_recover(state->inode,
1581                                         stateid);
1582                         nfs4_schedule_stateid_recovery(server, state);
1583                         return 0;
1584                 case -NFS4ERR_DELAY:
1585                 case -NFS4ERR_GRACE:
1586                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1587                         ssleep(1);
1588                         return -EAGAIN;
1589                 case -ENOMEM:
1590                 case -NFS4ERR_DENIED:
1591                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1592                         return 0;
1593         }
1594         return err;
1595 }
1596
1597 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1598 {
1599         struct nfs_server *server = NFS_SERVER(state->inode);
1600         struct nfs4_opendata *opendata;
1601         int err;
1602
1603         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1604                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1605         if (IS_ERR(opendata))
1606                 return PTR_ERR(opendata);
1607         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1608         err = nfs4_open_recover(opendata, state);
1609         nfs4_opendata_put(opendata);
1610         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1611 }
1612
1613 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1614 {
1615         struct nfs4_opendata *data = calldata;
1616
1617         data->rpc_status = task->tk_status;
1618         if (data->rpc_status == 0) {
1619                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1620                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1621                 renew_lease(data->o_res.server, data->timestamp);
1622                 data->rpc_done = 1;
1623         }
1624 }
1625
1626 static void nfs4_open_confirm_release(void *calldata)
1627 {
1628         struct nfs4_opendata *data = calldata;
1629         struct nfs4_state *state = NULL;
1630
1631         /* If this request hasn't been cancelled, do nothing */
1632         if (data->cancelled == 0)
1633                 goto out_free;
1634         /* In case of error, no cleanup! */
1635         if (!data->rpc_done)
1636                 goto out_free;
1637         state = nfs4_opendata_to_nfs4_state(data);
1638         if (!IS_ERR(state))
1639                 nfs4_close_state(state, data->o_arg.fmode);
1640 out_free:
1641         nfs4_opendata_put(data);
1642 }
1643
1644 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1645         .rpc_call_done = nfs4_open_confirm_done,
1646         .rpc_release = nfs4_open_confirm_release,
1647 };
1648
1649 /*
1650  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1651  */
1652 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1653 {
1654         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1655         struct rpc_task *task;
1656         struct  rpc_message msg = {
1657                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1658                 .rpc_argp = &data->c_arg,
1659                 .rpc_resp = &data->c_res,
1660                 .rpc_cred = data->owner->so_cred,
1661         };
1662         struct rpc_task_setup task_setup_data = {
1663                 .rpc_client = server->client,
1664                 .rpc_message = &msg,
1665                 .callback_ops = &nfs4_open_confirm_ops,
1666                 .callback_data = data,
1667                 .workqueue = nfsiod_workqueue,
1668                 .flags = RPC_TASK_ASYNC,
1669         };
1670         int status;
1671
1672         kref_get(&data->kref);
1673         data->rpc_done = 0;
1674         data->rpc_status = 0;
1675         data->timestamp = jiffies;
1676         task = rpc_run_task(&task_setup_data);
1677         if (IS_ERR(task))
1678                 return PTR_ERR(task);
1679         status = nfs4_wait_for_completion_rpc_task(task);
1680         if (status != 0) {
1681                 data->cancelled = 1;
1682                 smp_wmb();
1683         } else
1684                 status = data->rpc_status;
1685         rpc_put_task(task);
1686         return status;
1687 }
1688
1689 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1690 {
1691         struct nfs4_opendata *data = calldata;
1692         struct nfs4_state_owner *sp = data->owner;
1693         struct nfs_client *clp = sp->so_server->nfs_client;
1694
1695         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1696                 goto out_wait;
1697         /*
1698          * Check if we still need to send an OPEN call, or if we can use
1699          * a delegation instead.
1700          */
1701         if (data->state != NULL) {
1702                 struct nfs_delegation *delegation;
1703
1704                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1705                         goto out_no_action;
1706                 rcu_read_lock();
1707                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1708                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1709                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1710                     can_open_delegated(delegation, data->o_arg.fmode))
1711                         goto unlock_no_action;
1712                 rcu_read_unlock();
1713         }
1714         /* Update client id. */
1715         data->o_arg.clientid = clp->cl_clientid;
1716         switch (data->o_arg.claim) {
1717         case NFS4_OPEN_CLAIM_PREVIOUS:
1718         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1719         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1720                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1721         case NFS4_OPEN_CLAIM_FH:
1722                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1723                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1724         }
1725         data->timestamp = jiffies;
1726         if (nfs4_setup_sequence(data->o_arg.server,
1727                                 &data->o_arg.seq_args,
1728                                 &data->o_res.seq_res,
1729                                 task) != 0)
1730                 nfs_release_seqid(data->o_arg.seqid);
1731
1732         /* Set the create mode (note dependency on the session type) */
1733         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1734         if (data->o_arg.open_flags & O_EXCL) {
1735                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1736                 if (nfs4_has_persistent_session(clp))
1737                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1738                 else if (clp->cl_mvops->minor_version > 0)
1739                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1740         }
1741         return;
1742 unlock_no_action:
1743         rcu_read_unlock();
1744 out_no_action:
1745         task->tk_action = NULL;
1746 out_wait:
1747         nfs4_sequence_done(task, &data->o_res.seq_res);
1748 }
1749
1750 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1751 {
1752         struct nfs4_opendata *data = calldata;
1753
1754         data->rpc_status = task->tk_status;
1755
1756         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1757                 return;
1758
1759         if (task->tk_status == 0) {
1760                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1761                         switch (data->o_res.f_attr->mode & S_IFMT) {
1762                         case S_IFREG:
1763                                 break;
1764                         case S_IFLNK:
1765                                 data->rpc_status = -ELOOP;
1766                                 break;
1767                         case S_IFDIR:
1768                                 data->rpc_status = -EISDIR;
1769                                 break;
1770                         default:
1771                                 data->rpc_status = -ENOTDIR;
1772                         }
1773                 }
1774                 renew_lease(data->o_res.server, data->timestamp);
1775                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1776                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1777         }
1778         data->rpc_done = 1;
1779 }
1780
1781 static void nfs4_open_release(void *calldata)
1782 {
1783         struct nfs4_opendata *data = calldata;
1784         struct nfs4_state *state = NULL;
1785
1786         /* If this request hasn't been cancelled, do nothing */
1787         if (data->cancelled == 0)
1788                 goto out_free;
1789         /* In case of error, no cleanup! */
1790         if (data->rpc_status != 0 || !data->rpc_done)
1791                 goto out_free;
1792         /* In case we need an open_confirm, no cleanup! */
1793         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1794                 goto out_free;
1795         state = nfs4_opendata_to_nfs4_state(data);
1796         if (!IS_ERR(state))
1797                 nfs4_close_state(state, data->o_arg.fmode);
1798 out_free:
1799         nfs4_opendata_put(data);
1800 }
1801
1802 static const struct rpc_call_ops nfs4_open_ops = {
1803         .rpc_call_prepare = nfs4_open_prepare,
1804         .rpc_call_done = nfs4_open_done,
1805         .rpc_release = nfs4_open_release,
1806 };
1807
1808 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1809 {
1810         struct inode *dir = data->dir->d_inode;
1811         struct nfs_server *server = NFS_SERVER(dir);
1812         struct nfs_openargs *o_arg = &data->o_arg;
1813         struct nfs_openres *o_res = &data->o_res;
1814         struct rpc_task *task;
1815         struct rpc_message msg = {
1816                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1817                 .rpc_argp = o_arg,
1818                 .rpc_resp = o_res,
1819                 .rpc_cred = data->owner->so_cred,
1820         };
1821         struct rpc_task_setup task_setup_data = {
1822                 .rpc_client = server->client,
1823                 .rpc_message = &msg,
1824                 .callback_ops = &nfs4_open_ops,
1825                 .callback_data = data,
1826                 .workqueue = nfsiod_workqueue,
1827                 .flags = RPC_TASK_ASYNC,
1828         };
1829         int status;
1830
1831         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1832         kref_get(&data->kref);
1833         data->rpc_done = 0;
1834         data->rpc_status = 0;
1835         data->cancelled = 0;
1836         data->is_recover = 0;
1837         if (isrecover) {
1838                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1839                 data->is_recover = 1;
1840         }
1841         task = rpc_run_task(&task_setup_data);
1842         if (IS_ERR(task))
1843                 return PTR_ERR(task);
1844         status = nfs4_wait_for_completion_rpc_task(task);
1845         if (status != 0) {
1846                 data->cancelled = 1;
1847                 smp_wmb();
1848         } else
1849                 status = data->rpc_status;
1850         rpc_put_task(task);
1851
1852         return status;
1853 }
1854
1855 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1856 {
1857         struct inode *dir = data->dir->d_inode;
1858         struct nfs_openres *o_res = &data->o_res;
1859         int status;
1860
1861         status = nfs4_run_open_task(data, 1);
1862         if (status != 0 || !data->rpc_done)
1863                 return status;
1864
1865         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1866
1867         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1868                 status = _nfs4_proc_open_confirm(data);
1869                 if (status != 0)
1870                         return status;
1871         }
1872
1873         return status;
1874 }
1875
1876 static int nfs4_opendata_access(struct rpc_cred *cred,
1877                                 struct nfs4_opendata *opendata,
1878                                 struct nfs4_state *state, fmode_t fmode,
1879                                 int openflags)
1880 {
1881         struct nfs_access_entry cache;
1882         u32 mask;
1883
1884         /* access call failed or for some reason the server doesn't
1885          * support any access modes -- defer access call until later */
1886         if (opendata->o_res.access_supported == 0)
1887                 return 0;
1888
1889         mask = 0;
1890         /* don't check MAY_WRITE - a newly created file may not have
1891          * write mode bits, but POSIX allows the creating process to write.
1892          * use openflags to check for exec, because fmode won't
1893          * always have FMODE_EXEC set when file open for exec. */
1894         if (openflags & __FMODE_EXEC) {
1895                 /* ONLY check for exec rights */
1896                 mask = MAY_EXEC;
1897         } else if (fmode & FMODE_READ)
1898                 mask = MAY_READ;
1899
1900         cache.cred = cred;
1901         cache.jiffies = jiffies;
1902         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1903         nfs_access_add_cache(state->inode, &cache);
1904
1905         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1906                 return 0;
1907
1908         /* even though OPEN succeeded, access is denied. Close the file */
1909         nfs4_close_state(state, fmode);
1910         return -EACCES;
1911 }
1912
1913 /*
1914  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1915  */
1916 static int _nfs4_proc_open(struct nfs4_opendata *data)
1917 {
1918         struct inode *dir = data->dir->d_inode;
1919         struct nfs_server *server = NFS_SERVER(dir);
1920         struct nfs_openargs *o_arg = &data->o_arg;
1921         struct nfs_openres *o_res = &data->o_res;
1922         int status;
1923
1924         status = nfs4_run_open_task(data, 0);
1925         if (!data->rpc_done)
1926                 return status;
1927         if (status != 0) {
1928                 if (status == -NFS4ERR_BADNAME &&
1929                                 !(o_arg->open_flags & O_CREAT))
1930                         return -ENOENT;
1931                 return status;
1932         }
1933
1934         nfs_fattr_map_and_free_names(server, &data->f_attr);
1935
1936         if (o_arg->open_flags & O_CREAT)
1937                 update_changeattr(dir, &o_res->cinfo);
1938         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1939                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1940         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1941                 status = _nfs4_proc_open_confirm(data);
1942                 if (status != 0)
1943                         return status;
1944         }
1945         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1946                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1947         return 0;
1948 }
1949
1950 static int nfs4_recover_expired_lease(struct nfs_server *server)
1951 {
1952         return nfs4_client_recover_expired_lease(server->nfs_client);
1953 }
1954
1955 /*
1956  * OPEN_EXPIRED:
1957  *      reclaim state on the server after a network partition.
1958  *      Assumes caller holds the appropriate lock
1959  */
1960 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1961 {
1962         struct nfs4_opendata *opendata;
1963         int ret;
1964
1965         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1966                         NFS4_OPEN_CLAIM_FH);
1967         if (IS_ERR(opendata))
1968                 return PTR_ERR(opendata);
1969         ret = nfs4_open_recover(opendata, state);
1970         if (ret == -ESTALE)
1971                 d_drop(ctx->dentry);
1972         nfs4_opendata_put(opendata);
1973         return ret;
1974 }
1975
1976 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1977 {
1978         struct nfs_server *server = NFS_SERVER(state->inode);
1979         struct nfs4_exception exception = { };
1980         int err;
1981
1982         do {
1983                 err = _nfs4_open_expired(ctx, state);
1984                 trace_nfs4_open_expired(ctx, 0, err);
1985                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1986                         continue;
1987                 switch (err) {
1988                 default:
1989                         goto out;
1990                 case -NFS4ERR_GRACE:
1991                 case -NFS4ERR_DELAY:
1992                         nfs4_handle_exception(server, err, &exception);
1993                         err = 0;
1994                 }
1995         } while (exception.retry);
1996 out:
1997         return err;
1998 }
1999
2000 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2001 {
2002         struct nfs_open_context *ctx;
2003         int ret;
2004
2005         ctx = nfs4_state_find_open_context(state);
2006         if (IS_ERR(ctx))
2007                 return -EAGAIN;
2008         ret = nfs4_do_open_expired(ctx, state);
2009         put_nfs_open_context(ctx);
2010         return ret;
2011 }
2012
2013 #if defined(CONFIG_NFS_V4_1)
2014 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2015 {
2016         struct nfs_server *server = NFS_SERVER(state->inode);
2017         nfs4_stateid *stateid = &state->stateid;
2018         struct nfs_delegation *delegation;
2019         struct rpc_cred *cred = NULL;
2020         int status = -NFS4ERR_BAD_STATEID;
2021
2022         /* If a state reset has been done, test_stateid is unneeded */
2023         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2024                 return;
2025
2026         /* Get the delegation credential for use by test/free_stateid */
2027         rcu_read_lock();
2028         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2029         if (delegation != NULL &&
2030             nfs4_stateid_match(&delegation->stateid, stateid)) {
2031                 cred = get_rpccred(delegation->cred);
2032                 rcu_read_unlock();
2033                 status = nfs41_test_stateid(server, stateid, cred);
2034                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2035         } else
2036                 rcu_read_unlock();
2037
2038         if (status != NFS_OK) {
2039                 /* Free the stateid unless the server explicitly
2040                  * informs us the stateid is unrecognized. */
2041                 if (status != -NFS4ERR_BAD_STATEID)
2042                         nfs41_free_stateid(server, stateid, cred);
2043                 nfs_remove_bad_delegation(state->inode);
2044
2045                 write_seqlock(&state->seqlock);
2046                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2047                 write_sequnlock(&state->seqlock);
2048                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2049         }
2050
2051         if (cred != NULL)
2052                 put_rpccred(cred);
2053 }
2054
2055 /**
2056  * nfs41_check_open_stateid - possibly free an open stateid
2057  *
2058  * @state: NFSv4 state for an inode
2059  *
2060  * Returns NFS_OK if recovery for this stateid is now finished.
2061  * Otherwise a negative NFS4ERR value is returned.
2062  */
2063 static int nfs41_check_open_stateid(struct nfs4_state *state)
2064 {
2065         struct nfs_server *server = NFS_SERVER(state->inode);
2066         nfs4_stateid *stateid = &state->open_stateid;
2067         struct rpc_cred *cred = state->owner->so_cred;
2068         int status;
2069
2070         /* If a state reset has been done, test_stateid is unneeded */
2071         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2072             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2073             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2074                 return -NFS4ERR_BAD_STATEID;
2075
2076         status = nfs41_test_stateid(server, stateid, cred);
2077         trace_nfs4_test_open_stateid(state, NULL, status);
2078         if (status != NFS_OK) {
2079                 /* Free the stateid unless the server explicitly
2080                  * informs us the stateid is unrecognized. */
2081                 if (status != -NFS4ERR_BAD_STATEID)
2082                         nfs41_free_stateid(server, stateid, cred);
2083
2084                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2085                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2086                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2087                 clear_bit(NFS_OPEN_STATE, &state->flags);
2088         }
2089         return status;
2090 }
2091
2092 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2093 {
2094         int status;
2095
2096         nfs41_clear_delegation_stateid(state);
2097         status = nfs41_check_open_stateid(state);
2098         if (status != NFS_OK)
2099                 status = nfs4_open_expired(sp, state);
2100         return status;
2101 }
2102 #endif
2103
2104 /*
2105  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2106  * fields corresponding to attributes that were used to store the verifier.
2107  * Make sure we clobber those fields in the later setattr call
2108  */
2109 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2110 {
2111         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2112             !(sattr->ia_valid & ATTR_ATIME_SET))
2113                 sattr->ia_valid |= ATTR_ATIME;
2114
2115         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2116             !(sattr->ia_valid & ATTR_MTIME_SET))
2117                 sattr->ia_valid |= ATTR_MTIME;
2118 }
2119
2120 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2121                 fmode_t fmode,
2122                 int flags,
2123                 struct nfs_open_context *ctx)
2124 {
2125         struct nfs4_state_owner *sp = opendata->owner;
2126         struct nfs_server *server = sp->so_server;
2127         struct dentry *dentry;
2128         struct nfs4_state *state;
2129         unsigned int seq;
2130         int ret;
2131
2132         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2133
2134         ret = _nfs4_proc_open(opendata);
2135         if (ret != 0)
2136                 goto out;
2137
2138         state = nfs4_opendata_to_nfs4_state(opendata);
2139         ret = PTR_ERR(state);
2140         if (IS_ERR(state))
2141                 goto out;
2142         if (server->caps & NFS_CAP_POSIX_LOCK)
2143                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2144
2145         dentry = opendata->dentry;
2146         if (dentry->d_inode == NULL) {
2147                 /* FIXME: Is this d_drop() ever needed? */
2148                 d_drop(dentry);
2149                 dentry = d_add_unique(dentry, igrab(state->inode));
2150                 if (dentry == NULL) {
2151                         dentry = opendata->dentry;
2152                 } else if (dentry != ctx->dentry) {
2153                         dput(ctx->dentry);
2154                         ctx->dentry = dget(dentry);
2155                 }
2156                 nfs_set_verifier(dentry,
2157                                 nfs_save_change_attribute(opendata->dir->d_inode));
2158         }
2159
2160         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2161         if (ret != 0)
2162                 goto out;
2163
2164         ctx->state = state;
2165         if (dentry->d_inode == state->inode) {
2166                 nfs_inode_attach_open_context(ctx);
2167                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2168                         nfs4_schedule_stateid_recovery(server, state);
2169         }
2170 out:
2171         return ret;
2172 }
2173
2174 /*
2175  * Returns a referenced nfs4_state
2176  */
2177 static int _nfs4_do_open(struct inode *dir,
2178                         struct nfs_open_context *ctx,
2179                         int flags,
2180                         struct iattr *sattr,
2181                         struct nfs4_label *label)
2182 {
2183         struct nfs4_state_owner  *sp;
2184         struct nfs4_state     *state = NULL;
2185         struct nfs_server       *server = NFS_SERVER(dir);
2186         struct nfs4_opendata *opendata;
2187         struct dentry *dentry = ctx->dentry;
2188         struct rpc_cred *cred = ctx->cred;
2189         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2190         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2191         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2192         struct nfs4_label *olabel = NULL;
2193         int status;
2194
2195         /* Protect against reboot recovery conflicts */
2196         status = -ENOMEM;
2197         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2198         if (sp == NULL) {
2199                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2200                 goto out_err;
2201         }
2202         status = nfs4_recover_expired_lease(server);
2203         if (status != 0)
2204                 goto err_put_state_owner;
2205         if (dentry->d_inode != NULL)
2206                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2207         status = -ENOMEM;
2208         if (dentry->d_inode)
2209                 claim = NFS4_OPEN_CLAIM_FH;
2210         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2211                         label, claim, GFP_KERNEL);
2212         if (opendata == NULL)
2213                 goto err_put_state_owner;
2214
2215         if (label) {
2216                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2217                 if (IS_ERR(olabel)) {
2218                         status = PTR_ERR(olabel);
2219                         goto err_opendata_put;
2220                 }
2221         }
2222
2223         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2224                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2225                 if (!opendata->f_attr.mdsthreshold)
2226                         goto err_free_label;
2227                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2228         }
2229         if (dentry->d_inode != NULL)
2230                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2231
2232         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2233         if (status != 0)
2234                 goto err_free_label;
2235         state = ctx->state;
2236
2237         if ((opendata->o_arg.open_flags & O_EXCL) &&
2238             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2239                 nfs4_exclusive_attrset(opendata, sattr);
2240
2241                 nfs_fattr_init(opendata->o_res.f_attr);
2242                 status = nfs4_do_setattr(state->inode, cred,
2243                                 opendata->o_res.f_attr, sattr,
2244                                 state, label, olabel);
2245                 if (status == 0) {
2246                         nfs_setattr_update_inode(state->inode, sattr);
2247                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2248                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2249                 }
2250         }
2251
2252         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2253                 *ctx_th = opendata->f_attr.mdsthreshold;
2254         else
2255                 kfree(opendata->f_attr.mdsthreshold);
2256         opendata->f_attr.mdsthreshold = NULL;
2257
2258         nfs4_label_free(olabel);
2259
2260         nfs4_opendata_put(opendata);
2261         nfs4_put_state_owner(sp);
2262         return 0;
2263 err_free_label:
2264         nfs4_label_free(olabel);
2265 err_opendata_put:
2266         kfree(opendata->f_attr.mdsthreshold);
2267         nfs4_opendata_put(opendata);
2268 err_put_state_owner:
2269         nfs4_put_state_owner(sp);
2270 out_err:
2271         return status;
2272 }
2273
2274
2275 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2276                                         struct nfs_open_context *ctx,
2277                                         int flags,
2278                                         struct iattr *sattr,
2279                                         struct nfs4_label *label)
2280 {
2281         struct nfs_server *server = NFS_SERVER(dir);
2282         struct nfs4_exception exception = { };
2283         struct nfs4_state *res;
2284         int status;
2285
2286         do {
2287                 status = _nfs4_do_open(dir, ctx, flags, sattr, label);
2288                 res = ctx->state;
2289                 trace_nfs4_open_file(ctx, flags, status);
2290                 if (status == 0)
2291                         break;
2292                 /* NOTE: BAD_SEQID means the server and client disagree about the
2293                  * book-keeping w.r.t. state-changing operations
2294                  * (OPEN/CLOSE/LOCK/LOCKU...)
2295                  * It is actually a sign of a bug on the client or on the server.
2296                  *
2297                  * If we receive a BAD_SEQID error in the particular case of
2298                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2299                  * have unhashed the old state_owner for us, and that we can
2300                  * therefore safely retry using a new one. We should still warn
2301                  * the user though...
2302                  */
2303                 if (status == -NFS4ERR_BAD_SEQID) {
2304                         pr_warn_ratelimited("NFS: v4 server %s "
2305                                         " returned a bad sequence-id error!\n",
2306                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2307                         exception.retry = 1;
2308                         continue;
2309                 }
2310                 /*
2311                  * BAD_STATEID on OPEN means that the server cancelled our
2312                  * state before it received the OPEN_CONFIRM.
2313                  * Recover by retrying the request as per the discussion
2314                  * on Page 181 of RFC3530.
2315                  */
2316                 if (status == -NFS4ERR_BAD_STATEID) {
2317                         exception.retry = 1;
2318                         continue;
2319                 }
2320                 if (status == -EAGAIN) {
2321                         /* We must have found a delegation */
2322                         exception.retry = 1;
2323                         continue;
2324                 }
2325                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2326                         continue;
2327                 res = ERR_PTR(nfs4_handle_exception(server,
2328                                         status, &exception));
2329         } while (exception.retry);
2330         return res;
2331 }
2332
2333 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2334                             struct nfs_fattr *fattr, struct iattr *sattr,
2335                             struct nfs4_state *state, struct nfs4_label *ilabel,
2336                             struct nfs4_label *olabel)
2337 {
2338         struct nfs_server *server = NFS_SERVER(inode);
2339         struct nfs_setattrargs  arg = {
2340                 .fh             = NFS_FH(inode),
2341                 .iap            = sattr,
2342                 .server         = server,
2343                 .bitmask = server->attr_bitmask,
2344                 .label          = ilabel,
2345         };
2346         struct nfs_setattrres  res = {
2347                 .fattr          = fattr,
2348                 .label          = olabel,
2349                 .server         = server,
2350         };
2351         struct rpc_message msg = {
2352                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2353                 .rpc_argp       = &arg,
2354                 .rpc_resp       = &res,
2355                 .rpc_cred       = cred,
2356         };
2357         unsigned long timestamp = jiffies;
2358         fmode_t fmode;
2359         bool truncate;
2360         int status;
2361
2362         arg.bitmask = nfs4_bitmask(server, ilabel);
2363         if (ilabel)
2364                 arg.bitmask = nfs4_bitmask(server, olabel);
2365
2366         nfs_fattr_init(fattr);
2367
2368         /* Servers should only apply open mode checks for file size changes */
2369         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2370         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2371
2372         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2373                 /* Use that stateid */
2374         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2375                 struct nfs_lockowner lockowner = {
2376                         .l_owner = current->files,
2377                         .l_pid = current->tgid,
2378                 };
2379                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2380                                 &lockowner);
2381         } else
2382                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2383
2384         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2385         if (status == 0 && state != NULL)
2386                 renew_lease(server, timestamp);
2387         return status;
2388 }
2389
2390 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2391                            struct nfs_fattr *fattr, struct iattr *sattr,
2392                            struct nfs4_state *state, struct nfs4_label *ilabel,
2393                            struct nfs4_label *olabel)
2394 {
2395         struct nfs_server *server = NFS_SERVER(inode);
2396         struct nfs4_exception exception = {
2397                 .state = state,
2398                 .inode = inode,
2399         };
2400         int err;
2401         do {
2402                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2403                 trace_nfs4_setattr(inode, err);
2404                 switch (err) {
2405                 case -NFS4ERR_OPENMODE:
2406                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2407                                 pr_warn_once("NFSv4: server %s is incorrectly "
2408                                                 "applying open mode checks to "
2409                                                 "a SETATTR that is not "
2410                                                 "changing file size.\n",
2411                                                 server->nfs_client->cl_hostname);
2412                         }
2413                         if (state && !(state->state & FMODE_WRITE)) {
2414                                 err = -EBADF;
2415                                 if (sattr->ia_valid & ATTR_OPEN)
2416                                         err = -EACCES;
2417                                 goto out;
2418                         }
2419                 }
2420                 err = nfs4_handle_exception(server, err, &exception);
2421         } while (exception.retry);
2422 out:
2423         return err;
2424 }
2425
2426 struct nfs4_closedata {
2427         struct inode *inode;
2428         struct nfs4_state *state;
2429         struct nfs_closeargs arg;
2430         struct nfs_closeres res;
2431         struct nfs_fattr fattr;
2432         unsigned long timestamp;
2433         bool roc;
2434         u32 roc_barrier;
2435 };
2436
2437 static void nfs4_free_closedata(void *data)
2438 {
2439         struct nfs4_closedata *calldata = data;
2440         struct nfs4_state_owner *sp = calldata->state->owner;
2441         struct super_block *sb = calldata->state->inode->i_sb;
2442
2443         if (calldata->roc)
2444                 pnfs_roc_release(calldata->state->inode);
2445         nfs4_put_open_state(calldata->state);
2446         nfs_free_seqid(calldata->arg.seqid);
2447         nfs4_put_state_owner(sp);
2448         nfs_sb_deactive(sb);
2449         kfree(calldata);
2450 }
2451
2452 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2453                 fmode_t fmode)
2454 {
2455         spin_lock(&state->owner->so_lock);
2456         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2457         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2458         case FMODE_WRITE:
2459                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2460                 break;
2461         case FMODE_READ:
2462                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2463                 break;
2464         case 0:
2465                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2466                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2467                 clear_bit(NFS_OPEN_STATE, &state->flags);
2468         }
2469         spin_unlock(&state->owner->so_lock);
2470 }
2471
2472 static void nfs4_close_done(struct rpc_task *task, void *data)
2473 {
2474         struct nfs4_closedata *calldata = data;
2475         struct nfs4_state *state = calldata->state;
2476         struct nfs_server *server = NFS_SERVER(calldata->inode);
2477
2478         dprintk("%s: begin!\n", __func__);
2479         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2480                 return;
2481         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2482         /* hmm. we are done with the inode, and in the process of freeing
2483          * the state_owner. we keep this around to process errors
2484          */
2485         switch (task->tk_status) {
2486                 case 0:
2487                         if (calldata->roc)
2488                                 pnfs_roc_set_barrier(state->inode,
2489                                                      calldata->roc_barrier);
2490                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2491                         renew_lease(server, calldata->timestamp);
2492                         nfs4_close_clear_stateid_flags(state,
2493                                         calldata->arg.fmode);
2494                         break;
2495                 case -NFS4ERR_STALE_STATEID:
2496                 case -NFS4ERR_OLD_STATEID:
2497                 case -NFS4ERR_BAD_STATEID:
2498                 case -NFS4ERR_EXPIRED:
2499                         if (calldata->arg.fmode == 0)
2500                                 break;
2501                 default:
2502                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2503                                 rpc_restart_call_prepare(task);
2504         }
2505         nfs_release_seqid(calldata->arg.seqid);
2506         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2507         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2508 }
2509
2510 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2511 {
2512         struct nfs4_closedata *calldata = data;
2513         struct nfs4_state *state = calldata->state;
2514         struct inode *inode = calldata->inode;
2515         int call_close = 0;
2516
2517         dprintk("%s: begin!\n", __func__);
2518         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2519                 goto out_wait;
2520
2521         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2522         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2523         spin_lock(&state->owner->so_lock);
2524         /* Calculate the change in open mode */
2525         if (state->n_rdwr == 0) {
2526                 if (state->n_rdonly == 0) {
2527                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2528                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2529                         calldata->arg.fmode &= ~FMODE_READ;
2530                 }
2531                 if (state->n_wronly == 0) {
2532                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2533                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2534                         calldata->arg.fmode &= ~FMODE_WRITE;
2535                 }
2536         }
2537         if (!nfs4_valid_open_stateid(state))
2538                 call_close = 0;
2539         spin_unlock(&state->owner->so_lock);
2540
2541         if (!call_close) {
2542                 /* Note: exit _without_ calling nfs4_close_done */
2543                 goto out_no_action;
2544         }
2545
2546         if (calldata->arg.fmode == 0) {
2547                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2548                 if (calldata->roc &&
2549                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2550                         nfs_release_seqid(calldata->arg.seqid);
2551                         goto out_wait;
2552                     }
2553         }
2554
2555         nfs_fattr_init(calldata->res.fattr);
2556         calldata->timestamp = jiffies;
2557         if (nfs4_setup_sequence(NFS_SERVER(inode),
2558                                 &calldata->arg.seq_args,
2559                                 &calldata->res.seq_res,
2560                                 task) != 0)
2561                 nfs_release_seqid(calldata->arg.seqid);
2562         dprintk("%s: done!\n", __func__);
2563         return;
2564 out_no_action:
2565         task->tk_action = NULL;
2566 out_wait:
2567         nfs4_sequence_done(task, &calldata->res.seq_res);
2568 }
2569
2570 static const struct rpc_call_ops nfs4_close_ops = {
2571         .rpc_call_prepare = nfs4_close_prepare,
2572         .rpc_call_done = nfs4_close_done,
2573         .rpc_release = nfs4_free_closedata,
2574 };
2575
2576 /*
2577  * It is possible for data to be read/written from a mem-mapped file
2578  * after the sys_close call (which hits the vfs layer as a flush).
2579  * This means that we can't safely call nfsv4 close on a file until
2580  * the inode is cleared. This in turn means that we are not good
2581  * NFSv4 citizens - we do not indicate to the server to update the file's
2582  * share state even when we are done with one of the three share
2583  * stateid's in the inode.
2584  *
2585  * NOTE: Caller must be holding the sp->so_owner semaphore!
2586  */
2587 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2588 {
2589         struct nfs_server *server = NFS_SERVER(state->inode);
2590         struct nfs4_closedata *calldata;
2591         struct nfs4_state_owner *sp = state->owner;
2592         struct rpc_task *task;
2593         struct rpc_message msg = {
2594                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2595                 .rpc_cred = state->owner->so_cred,
2596         };
2597         struct rpc_task_setup task_setup_data = {
2598                 .rpc_client = server->client,
2599                 .rpc_message = &msg,
2600                 .callback_ops = &nfs4_close_ops,
2601                 .workqueue = nfsiod_workqueue,
2602                 .flags = RPC_TASK_ASYNC,
2603         };
2604         int status = -ENOMEM;
2605
2606         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2607         if (calldata == NULL)
2608                 goto out;
2609         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2610         calldata->inode = state->inode;
2611         calldata->state = state;
2612         calldata->arg.fh = NFS_FH(state->inode);
2613         calldata->arg.stateid = &state->open_stateid;
2614         /* Serialization for the sequence id */
2615         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2616         if (calldata->arg.seqid == NULL)
2617                 goto out_free_calldata;
2618         calldata->arg.fmode = 0;
2619         calldata->arg.bitmask = server->cache_consistency_bitmask;
2620         calldata->res.fattr = &calldata->fattr;
2621         calldata->res.seqid = calldata->arg.seqid;
2622         calldata->res.server = server;
2623         calldata->roc = pnfs_roc(state->inode);
2624         nfs_sb_active(calldata->inode->i_sb);
2625
2626         msg.rpc_argp = &calldata->arg;
2627         msg.rpc_resp = &calldata->res;
2628         task_setup_data.callback_data = calldata;
2629         task = rpc_run_task(&task_setup_data);
2630         if (IS_ERR(task))
2631                 return PTR_ERR(task);
2632         status = 0;
2633         if (wait)
2634                 status = rpc_wait_for_completion_task(task);
2635         rpc_put_task(task);
2636         return status;
2637 out_free_calldata:
2638         kfree(calldata);
2639 out:
2640         nfs4_put_open_state(state);
2641         nfs4_put_state_owner(sp);
2642         return status;
2643 }
2644
2645 static struct inode *
2646 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2647 {
2648         struct nfs4_state *state;
2649         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2650
2651         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2652
2653         /* Protect against concurrent sillydeletes */
2654         state = nfs4_do_open(dir, ctx, open_flags, attr, label);
2655
2656         nfs4_label_release_security(label);
2657
2658         if (IS_ERR(state))
2659                 return ERR_CAST(state);
2660         return state->inode;
2661 }
2662
2663 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2664 {
2665         if (ctx->state == NULL)
2666                 return;
2667         if (is_sync)
2668                 nfs4_close_sync(ctx->state, ctx->mode);
2669         else
2670                 nfs4_close_state(ctx->state, ctx->mode);
2671 }
2672
2673 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2674 {
2675         struct nfs4_server_caps_arg args = {
2676                 .fhandle = fhandle,
2677         };
2678         struct nfs4_server_caps_res res = {};
2679         struct rpc_message msg = {
2680                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2681                 .rpc_argp = &args,
2682                 .rpc_resp = &res,
2683         };
2684         int status;
2685
2686         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2687         if (status == 0) {
2688                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2689                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2690                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2691                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2692                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2693                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2694                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2695                         server->caps |= NFS_CAP_ACLS;
2696                 if (res.has_links != 0)
2697                         server->caps |= NFS_CAP_HARDLINKS;
2698                 if (res.has_symlinks != 0)
2699                         server->caps |= NFS_CAP_SYMLINKS;
2700                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2701                         server->caps |= NFS_CAP_FILEID;
2702                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2703                         server->caps |= NFS_CAP_MODE;
2704                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2705                         server->caps |= NFS_CAP_NLINK;
2706                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2707                         server->caps |= NFS_CAP_OWNER;
2708                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2709                         server->caps |= NFS_CAP_OWNER_GROUP;
2710                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2711                         server->caps |= NFS_CAP_ATIME;
2712                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2713                         server->caps |= NFS_CAP_CTIME;
2714                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2715                         server->caps |= NFS_CAP_MTIME;
2716 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2717                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2718                         server->caps |= NFS_CAP_SECURITY_LABEL;
2719 #endif
2720                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2721                                 sizeof(server->attr_bitmask));
2722
2723                 if (server->caps & NFS_CAP_SECURITY_LABEL) {
2724                         server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2725                         res.attr_bitmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2726                 }
2727                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2728                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2729                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2730                 server->acl_bitmask = res.acl_bitmask;
2731                 server->fh_expire_type = res.fh_expire_type;
2732         }
2733
2734         return status;
2735 }
2736
2737 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2738 {
2739         struct nfs4_exception exception = { };
2740         int err;
2741         do {
2742                 err = nfs4_handle_exception(server,
2743                                 _nfs4_server_capabilities(server, fhandle),
2744                                 &exception);
2745         } while (exception.retry);
2746         return err;
2747 }
2748
2749 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2750                 struct nfs_fsinfo *info)
2751 {
2752         u32 bitmask[3];
2753         struct nfs4_lookup_root_arg args = {
2754                 .bitmask = bitmask,
2755         };
2756         struct nfs4_lookup_res res = {
2757                 .server = server,
2758                 .fattr = info->fattr,
2759                 .fh = fhandle,
2760         };
2761         struct rpc_message msg = {
2762                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2763                 .rpc_argp = &args,
2764                 .rpc_resp = &res,
2765         };
2766
2767         bitmask[0] = nfs4_fattr_bitmap[0];
2768         bitmask[1] = nfs4_fattr_bitmap[1];
2769         /*
2770          * Process the label in the upcoming getfattr
2771          */
2772         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2773
2774         nfs_fattr_init(info->fattr);
2775         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2776 }
2777
2778 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2779                 struct nfs_fsinfo *info)
2780 {
2781         struct nfs4_exception exception = { };
2782         int err;
2783         do {
2784                 err = _nfs4_lookup_root(server, fhandle, info);
2785                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2786                 switch (err) {
2787                 case 0:
2788                 case -NFS4ERR_WRONGSEC:
2789                         goto out;
2790                 default:
2791                         err = nfs4_handle_exception(server, err, &exception);
2792                 }
2793         } while (exception.retry);
2794 out:
2795         return err;
2796 }
2797
2798 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2799                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2800 {
2801         struct rpc_auth_create_args auth_args = {
2802                 .pseudoflavor = flavor,
2803         };
2804         struct rpc_auth *auth;
2805         int ret;
2806
2807         auth = rpcauth_create(&auth_args, server->client);
2808         if (IS_ERR(auth)) {
2809                 ret = -EACCES;
2810                 goto out;
2811         }
2812         ret = nfs4_lookup_root(server, fhandle, info);
2813 out:
2814         return ret;
2815 }
2816
2817 /*
2818  * Retry pseudoroot lookup with various security flavors.  We do this when:
2819  *
2820  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2821  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2822  *
2823  * Returns zero on success, or a negative NFS4ERR value, or a
2824  * negative errno value.
2825  */
2826 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2827                               struct nfs_fsinfo *info)
2828 {
2829         /* Per 3530bis 15.33.5 */
2830         static const rpc_authflavor_t flav_array[] = {
2831                 RPC_AUTH_GSS_KRB5P,
2832                 RPC_AUTH_GSS_KRB5I,
2833                 RPC_AUTH_GSS_KRB5,
2834                 RPC_AUTH_UNIX,                  /* courtesy */
2835                 RPC_AUTH_NULL,
2836         };
2837         int status = -EPERM;
2838         size_t i;
2839
2840         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2841                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2842                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2843                         continue;
2844                 break;
2845         }
2846
2847         /*
2848          * -EACCESS could mean that the user doesn't have correct permissions
2849          * to access the mount.  It could also mean that we tried to mount
2850          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2851          * existing mount programs don't handle -EACCES very well so it should
2852          * be mapped to -EPERM instead.
2853          */
2854         if (status == -EACCES)
2855                 status = -EPERM;
2856         return status;
2857 }
2858
2859 static int nfs4_do_find_root_sec(struct nfs_server *server,
2860                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2861 {
2862         int mv = server->nfs_client->cl_minorversion;
2863         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2864 }
2865
2866 /**
2867  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2868  * @server: initialized nfs_server handle
2869  * @fhandle: we fill in the pseudo-fs root file handle
2870  * @info: we fill in an FSINFO struct
2871  *
2872  * Returns zero on success, or a negative errno.
2873  */
2874 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2875                          struct nfs_fsinfo *info)
2876 {
2877         int status;
2878
2879         status = nfs4_lookup_root(server, fhandle, info);
2880         if ((status == -NFS4ERR_WRONGSEC) &&
2881             !(server->flags & NFS_MOUNT_SECFLAVOUR))
2882                 status = nfs4_do_find_root_sec(server, fhandle, info);
2883
2884         if (status == 0)
2885                 status = nfs4_server_capabilities(server, fhandle);
2886         if (status == 0)
2887                 status = nfs4_do_fsinfo(server, fhandle, info);
2888
2889         return nfs4_map_errors(status);
2890 }
2891
2892 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2893                               struct nfs_fsinfo *info)
2894 {
2895         int error;
2896         struct nfs_fattr *fattr = info->fattr;
2897         struct nfs4_label *label = NULL;
2898
2899         error = nfs4_server_capabilities(server, mntfh);
2900         if (error < 0) {
2901                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2902                 return error;
2903         }
2904
2905         label = nfs4_label_alloc(server, GFP_KERNEL);
2906         if (IS_ERR(label))
2907                 return PTR_ERR(label);
2908
2909         error = nfs4_proc_getattr(server, mntfh, fattr, label);
2910         if (error < 0) {
2911                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2912                 goto err_free_label;
2913         }
2914
2915         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2916             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2917                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2918
2919 err_free_label:
2920         nfs4_label_free(label);
2921
2922         return error;
2923 }
2924
2925 /*
2926  * Get locations and (maybe) other attributes of a referral.
2927  * Note that we'll actually follow the referral later when
2928  * we detect fsid mismatch in inode revalidation
2929  */
2930 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2931                              const struct qstr *name, struct nfs_fattr *fattr,
2932                              struct nfs_fh *fhandle)
2933 {
2934         int status = -ENOMEM;
2935         struct page *page = NULL;
2936         struct nfs4_fs_locations *locations = NULL;
2937
2938         page = alloc_page(GFP_KERNEL);
2939         if (page == NULL)
2940                 goto out;
2941         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2942         if (locations == NULL)
2943                 goto out;
2944
2945         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2946         if (status != 0)
2947                 goto out;
2948         /* Make sure server returned a different fsid for the referral */
2949         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2950                 dprintk("%s: server did not return a different fsid for"
2951                         " a referral at %s\n", __func__, name->name);
2952                 status = -EIO;
2953                 goto out;
2954         }
2955         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2956         nfs_fixup_referral_attributes(&locations->fattr);
2957
2958         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2959         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2960         memset(fhandle, 0, sizeof(struct nfs_fh));
2961 out:
2962         if (page)
2963                 __free_page(page);
2964         kfree(locations);
2965         return status;
2966 }
2967
2968 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
2969                                 struct nfs_fattr *fattr, struct nfs4_label *label)
2970 {
2971         struct nfs4_getattr_arg args = {
2972                 .fh = fhandle,
2973                 .bitmask = server->attr_bitmask,
2974         };
2975         struct nfs4_getattr_res res = {
2976                 .fattr = fattr,
2977                 .label = label,
2978                 .server = server,
2979         };
2980         struct rpc_message msg = {
2981                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2982                 .rpc_argp = &args,
2983                 .rpc_resp = &res,
2984         };
2985
2986         args.bitmask = nfs4_bitmask(server, label);
2987
2988         nfs_fattr_init(fattr);
2989         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2990 }
2991
2992 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
2993                                 struct nfs_fattr *fattr, struct nfs4_label *label)
2994 {
2995         struct nfs4_exception exception = { };
2996         int err;
2997         do {
2998                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
2999                 trace_nfs4_getattr(server, fhandle, fattr, err);
3000                 err = nfs4_handle_exception(server, err,
3001                                 &exception);
3002         } while (exception.retry);
3003         return err;
3004 }
3005
3006 /*
3007  * The file is not closed if it is opened due to the a request to change
3008  * the size of the file. The open call will not be needed once the
3009  * VFS layer lookup-intents are implemented.
3010  *
3011  * Close is called when the inode is destroyed.
3012  * If we haven't opened the file for O_WRONLY, we
3013  * need to in the size_change case to obtain a stateid.
3014  *
3015  * Got race?
3016  * Because OPEN is always done by name in nfsv4, it is
3017  * possible that we opened a different file by the same
3018  * name.  We can recognize this race condition, but we
3019  * can't do anything about it besides returning an error.
3020  *
3021  * This will be fixed with VFS changes (lookup-intent).
3022  */
3023 static int
3024 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3025                   struct iattr *sattr)
3026 {
3027         struct inode *inode = dentry->d_inode;
3028         struct rpc_cred *cred = NULL;
3029         struct nfs4_state *state = NULL;
3030         struct nfs4_label *label = NULL;
3031         int status;
3032
3033         if (pnfs_ld_layoutret_on_setattr(inode))
3034                 pnfs_commit_and_return_layout(inode);
3035
3036         nfs_fattr_init(fattr);
3037
3038         /* Deal with open(O_TRUNC) */
3039         if (sattr->ia_valid & ATTR_OPEN)
3040                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3041
3042         /* Optimization: if the end result is no change, don't RPC */
3043         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3044                 return 0;
3045
3046         /* Search for an existing open(O_WRITE) file */
3047         if (sattr->ia_valid & ATTR_FILE) {
3048                 struct nfs_open_context *ctx;
3049
3050                 ctx = nfs_file_open_context(sattr->ia_file);
3051                 if (ctx) {
3052                         cred = ctx->cred;
3053                         state = ctx->state;
3054                 }
3055         }
3056
3057         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3058         if (IS_ERR(label))
3059                 return PTR_ERR(label);
3060
3061         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3062         if (status == 0) {
3063                 nfs_setattr_update_inode(inode, sattr);
3064                 nfs_setsecurity(inode, fattr, label);
3065         }
3066         nfs4_label_free(label);
3067         return status;
3068 }
3069
3070 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3071                 const struct qstr *name, struct nfs_fh *fhandle,
3072                 struct nfs_fattr *fattr, struct nfs4_label *label)
3073 {
3074         struct nfs_server *server = NFS_SERVER(dir);
3075         int                    status;
3076         struct nfs4_lookup_arg args = {
3077                 .bitmask = server->attr_bitmask,
3078                 .dir_fh = NFS_FH(dir),
3079                 .name = name,
3080         };
3081         struct nfs4_lookup_res res = {
3082                 .server = server,
3083                 .fattr = fattr,
3084                 .label = label,
3085                 .fh = fhandle,
3086         };
3087         struct rpc_message msg = {
3088                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3089                 .rpc_argp = &args,
3090                 .rpc_resp = &res,
3091         };
3092
3093         args.bitmask = nfs4_bitmask(server, label);
3094
3095         nfs_fattr_init(fattr);
3096
3097         dprintk("NFS call  lookup %s\n", name->name);
3098         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3099         dprintk("NFS reply lookup: %d\n", status);
3100         return status;
3101 }
3102
3103 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3104 {
3105         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3106                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3107         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3108         fattr->nlink = 2;
3109 }
3110
3111 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3112                                    struct qstr *name, struct nfs_fh *fhandle,
3113                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3114 {
3115         struct nfs4_exception exception = { };
3116         struct rpc_clnt *client = *clnt;
3117         int err;
3118         do {
3119                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3120                 trace_nfs4_lookup(dir, name, err);
3121                 switch (err) {
3122                 case -NFS4ERR_BADNAME:
3123                         err = -ENOENT;
3124                         goto out;
3125                 case -NFS4ERR_MOVED:
3126                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3127                         goto out;
3128                 case -NFS4ERR_WRONGSEC:
3129                         err = -EPERM;
3130                         if (client != *clnt)
3131                                 goto out;
3132
3133                         client = nfs4_create_sec_client(client, dir, name);
3134                         if (IS_ERR(client))
3135                                 return PTR_ERR(client);
3136
3137                         exception.retry = 1;
3138                         break;
3139                 default:
3140                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3141                 }
3142         } while (exception.retry);
3143
3144 out:
3145         if (err == 0)
3146                 *clnt = client;
3147         else if (client != *clnt)
3148                 rpc_shutdown_client(client);
3149
3150         return err;
3151 }
3152
3153 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3154                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3155                             struct nfs4_label *label)
3156 {
3157         int status;
3158         struct rpc_clnt *client = NFS_CLIENT(dir);
3159
3160         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3161         if (client != NFS_CLIENT(dir)) {
3162                 rpc_shutdown_client(client);
3163                 nfs_fixup_secinfo_attributes(fattr);
3164         }
3165         return status;
3166 }
3167
3168 struct rpc_clnt *
3169 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3170                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3171 {
3172         int status;
3173         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
3174
3175         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3176         if (status < 0) {
3177                 rpc_shutdown_client(client);
3178                 return ERR_PTR(status);
3179         }
3180         return client;
3181 }
3182
3183 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3184 {
3185         struct nfs_server *server = NFS_SERVER(inode);
3186         struct nfs4_accessargs args = {
3187                 .fh = NFS_FH(inode),
3188                 .bitmask = server->cache_consistency_bitmask,
3189         };
3190         struct nfs4_accessres res = {
3191                 .server = server,
3192         };
3193         struct rpc_message msg = {
3194                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3195                 .rpc_argp = &args,
3196                 .rpc_resp = &res,
3197                 .rpc_cred = entry->cred,
3198         };
3199         int mode = entry->mask;
3200         int status = 0;
3201
3202         /*
3203          * Determine which access bits we want to ask for...
3204          */
3205         if (mode & MAY_READ)
3206                 args.access |= NFS4_ACCESS_READ;
3207         if (S_ISDIR(inode->i_mode)) {
3208                 if (mode & MAY_WRITE)
3209                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3210                 if (mode & MAY_EXEC)
3211                         args.access |= NFS4_ACCESS_LOOKUP;
3212         } else {
3213                 if (mode & MAY_WRITE)
3214                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3215                 if (mode & MAY_EXEC)
3216                         args.access |= NFS4_ACCESS_EXECUTE;
3217         }
3218
3219         res.fattr = nfs_alloc_fattr();
3220         if (res.fattr == NULL)
3221                 return -ENOMEM;
3222
3223         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3224         if (!status) {
3225                 nfs_access_set_mask(entry, res.access);
3226                 nfs_refresh_inode(inode, res.fattr);
3227         }
3228         nfs_free_fattr(res.fattr);
3229         return status;
3230 }
3231
3232 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3233 {
3234         struct nfs4_exception exception = { };
3235         int err;
3236         do {
3237                 err = _nfs4_proc_access(inode, entry);
3238                 trace_nfs4_access(inode, err);
3239                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3240                                 &exception);
3241         } while (exception.retry);
3242         return err;
3243 }
3244
3245 /*
3246  * TODO: For the time being, we don't try to get any attributes
3247  * along with any of the zero-copy operations READ, READDIR,
3248  * READLINK, WRITE.
3249  *
3250  * In the case of the first three, we want to put the GETATTR
3251  * after the read-type operation -- this is because it is hard
3252  * to predict the length of a GETATTR response in v4, and thus
3253  * align the READ data correctly.  This means that the GETATTR
3254  * may end up partially falling into the page cache, and we should
3255  * shift it into the 'tail' of the xdr_buf before processing.
3256  * To do this efficiently, we need to know the total length
3257  * of data received, which doesn't seem to be available outside
3258  * of the RPC layer.
3259  *
3260  * In the case of WRITE, we also want to put the GETATTR after
3261  * the operation -- in this case because we want to make sure
3262  * we get the post-operation mtime and size.
3263  *
3264  * Both of these changes to the XDR layer would in fact be quite
3265  * minor, but I decided to leave them for a subsequent patch.
3266  */
3267 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3268                 unsigned int pgbase, unsigned int pglen)
3269 {
3270         struct nfs4_readlink args = {
3271                 .fh       = NFS_FH(inode),
3272                 .pgbase   = pgbase,
3273                 .pglen    = pglen,
3274                 .pages    = &page,
3275         };
3276         struct nfs4_readlink_res res;
3277         struct rpc_message msg = {
3278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3279                 .rpc_argp = &args,
3280                 .rpc_resp = &res,
3281         };
3282
3283         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3284 }
3285
3286 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3287                 unsigned int pgbase, unsigned int pglen)
3288 {
3289         struct nfs4_exception exception = { };
3290         int err;
3291         do {
3292                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3293                 trace_nfs4_readlink(inode, err);
3294                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3295                                 &exception);
3296         } while (exception.retry);
3297         return err;
3298 }
3299
3300 /*
3301  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3302  */
3303 static int
3304 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3305                  int flags)
3306 {
3307         struct nfs4_label l, *ilabel = NULL;
3308         struct nfs_open_context *ctx;
3309         struct nfs4_state *state;
3310         int status = 0;
3311
3312         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3313         if (IS_ERR(ctx))
3314                 return PTR_ERR(ctx);
3315
3316         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3317
3318         sattr->ia_mode &= ~current_umask();
3319         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel);
3320         if (IS_ERR(state)) {
3321                 status = PTR_ERR(state);
3322                 goto out;
3323         }
3324 out:
3325         nfs4_label_release_security(ilabel);
3326         put_nfs_open_context(ctx);
3327         return status;
3328 }
3329
3330 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3331 {
3332         struct nfs_server *server = NFS_SERVER(dir);
3333         struct nfs_removeargs args = {
3334                 .fh = NFS_FH(dir),
3335                 .name = *name,
3336         };
3337         struct nfs_removeres res = {
3338                 .server = server,
3339         };
3340         struct rpc_message msg = {
3341                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3342                 .rpc_argp = &args,
3343                 .rpc_resp = &res,
3344         };
3345         int status;
3346
3347         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3348         if (status == 0)
3349                 update_changeattr(dir, &res.cinfo);
3350         return status;
3351 }
3352
3353 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3354 {
3355         struct nfs4_exception exception = { };
3356         int err;
3357         do {
3358                 err = _nfs4_proc_remove(dir, name);
3359                 trace_nfs4_remove(dir, name, err);
3360                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3361                                 &exception);
3362         } while (exception.retry);
3363         return err;
3364 }
3365
3366 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3367 {
3368         struct nfs_server *server = NFS_SERVER(dir);
3369         struct nfs_removeargs *args = msg->rpc_argp;
3370         struct nfs_removeres *res = msg->rpc_resp;
3371
3372         res->server = server;
3373         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3374         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3375
3376         nfs_fattr_init(res->dir_attr);
3377 }
3378
3379 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3380 {
3381         nfs4_setup_sequence(NFS_SERVER(data->dir),
3382                         &data->args.seq_args,
3383                         &data->res.seq_res,
3384                         task);
3385 }
3386
3387 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3388 {
3389         struct nfs_unlinkdata *data = task->tk_calldata;
3390         struct nfs_removeres *res = &data->res;
3391
3392         if (!nfs4_sequence_done(task, &res->seq_res))
3393                 return 0;
3394         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3395                 return 0;
3396         update_changeattr(dir, &res->cinfo);
3397         return 1;
3398 }
3399
3400 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3401 {
3402         struct nfs_server *server = NFS_SERVER(dir);
3403         struct nfs_renameargs *arg = msg->rpc_argp;
3404         struct nfs_renameres *res = msg->rpc_resp;
3405
3406         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3407         res->server = server;
3408         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3409 }
3410
3411 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3412 {
3413         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3414                         &data->args.seq_args,
3415                         &data->res.seq_res,
3416                         task);
3417 }
3418
3419 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3420                                  struct inode *new_dir)
3421 {
3422         struct nfs_renamedata *data = task->tk_calldata;
3423         struct nfs_renameres *res = &data->res;
3424
3425         if (!nfs4_sequence_done(task, &res->seq_res))
3426                 return 0;
3427         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3428                 return 0;
3429
3430         update_changeattr(old_dir, &res->old_cinfo);
3431         update_changeattr(new_dir, &res->new_cinfo);
3432         return 1;
3433 }
3434
3435 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3436                 struct inode *new_dir, struct qstr *new_name)
3437 {
3438         struct nfs_server *server = NFS_SERVER(old_dir);
3439         struct nfs_renameargs arg = {
3440                 .old_dir = NFS_FH(old_dir),
3441                 .new_dir = NFS_FH(new_dir),
3442                 .old_name = old_name,
3443                 .new_name = new_name,
3444         };
3445         struct nfs_renameres res = {
3446                 .server = server,
3447         };
3448         struct rpc_message msg = {
3449                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3450                 .rpc_argp = &arg,
3451                 .rpc_resp = &res,
3452         };
3453         int status = -ENOMEM;
3454
3455         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3456         if (!status) {
3457                 update_changeattr(old_dir, &res.old_cinfo);
3458                 update_changeattr(new_dir, &res.new_cinfo);
3459         }
3460         return status;
3461 }
3462
3463 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3464                 struct inode *new_dir, struct qstr *new_name)
3465 {
3466         struct nfs4_exception exception = { };
3467         int err;
3468         do {
3469                 err = _nfs4_proc_rename(old_dir, old_name,
3470                                         new_dir, new_name);
3471                 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3472                 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3473                                 &exception);
3474         } while (exception.retry);
3475         return err;
3476 }
3477
3478 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3479 {
3480         struct nfs_server *server = NFS_SERVER(inode);
3481         struct nfs4_link_arg arg = {
3482                 .fh     = NFS_FH(inode),
3483                 .dir_fh = NFS_FH(dir),
3484                 .name   = name,
3485                 .bitmask = server->attr_bitmask,
3486         };
3487         struct nfs4_link_res res = {
3488                 .server = server,
3489                 .label = NULL,
3490         };
3491         struct rpc_message msg = {
3492                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3493                 .rpc_argp = &arg,
3494                 .rpc_resp = &res,
3495         };
3496         int status = -ENOMEM;
3497
3498         res.fattr = nfs_alloc_fattr();
3499         if (res.fattr == NULL)
3500                 goto out;
3501
3502         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3503         if (IS_ERR(res.label)) {
3504                 status = PTR_ERR(res.label);
3505                 goto out;
3506         }
3507         arg.bitmask = nfs4_bitmask(server, res.label);
3508
3509         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3510         if (!status) {
3511                 update_changeattr(dir, &res.cinfo);
3512                 status = nfs_post_op_update_inode(inode, res.fattr);
3513                 if (!status)
3514                         nfs_setsecurity(inode, res.fattr, res.label);
3515         }
3516
3517
3518         nfs4_label_free(res.label);
3519
3520 out:
3521         nfs_free_fattr(res.fattr);
3522         return status;
3523 }
3524
3525 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3526 {
3527         struct nfs4_exception exception = { };
3528         int err;
3529         do {
3530                 err = nfs4_handle_exception(NFS_SERVER(inode),
3531                                 _nfs4_proc_link(inode, dir, name),
3532                                 &exception);
3533         } while (exception.retry);
3534         return err;
3535 }
3536
3537 struct nfs4_createdata {
3538         struct rpc_message msg;
3539         struct nfs4_create_arg arg;
3540         struct nfs4_create_res res;
3541         struct nfs_fh fh;
3542         struct nfs_fattr fattr;
3543         struct nfs4_label *label;
3544 };
3545
3546 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3547                 struct qstr *name, struct iattr *sattr, u32 ftype)
3548 {
3549         struct nfs4_createdata *data;
3550
3551         data = kzalloc(sizeof(*data), GFP_KERNEL);
3552         if (data != NULL) {
3553                 struct nfs_server *server = NFS_SERVER(dir);
3554
3555                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3556                 if (IS_ERR(data->label))
3557                         goto out_free;
3558
3559                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3560                 data->msg.rpc_argp = &data->arg;
3561                 data->msg.rpc_resp = &data->res;
3562                 data->arg.dir_fh = NFS_FH(dir);
3563                 data->arg.server = server;
3564                 data->arg.name = name;
3565                 data->arg.attrs = sattr;
3566                 data->arg.ftype = ftype;
3567                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3568                 data->res.server = server;
3569                 data->res.fh = &data->fh;
3570                 data->res.fattr = &data->fattr;
3571                 data->res.label = data->label;
3572                 nfs_fattr_init(data->res.fattr);
3573         }
3574         return data;
3575 out_free:
3576         kfree(data);
3577         return NULL;
3578 }
3579
3580 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3581 {
3582         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3583                                     &data->arg.seq_args, &data->res.seq_res, 1);
3584         if (status == 0) {
3585                 update_changeattr(dir, &data->res.dir_cinfo);
3586                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3587         }
3588         return status;
3589 }
3590
3591 static void nfs4_free_createdata(struct nfs4_createdata *data)
3592 {
3593         nfs4_label_free(data->label);
3594         kfree(data);
3595 }
3596
3597 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3598                 struct page *page, unsigned int len, struct iattr *sattr,
3599                 struct nfs4_label *label)
3600 {
3601         struct nfs4_createdata *data;
3602         int status = -ENAMETOOLONG;
3603
3604         if (len > NFS4_MAXPATHLEN)
3605                 goto out;
3606
3607         status = -ENOMEM;
3608         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3609         if (data == NULL)
3610                 goto out;
3611
3612         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3613         data->arg.u.symlink.pages = &page;
3614         data->arg.u.symlink.len = len;
3615         data->arg.label = label;
3616
3617         status = nfs4_do_create(dir, dentry, data);
3618
3619         nfs4_free_createdata(data);
3620 out:
3621         return status;
3622 }
3623
3624 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3625                 struct page *page, unsigned int len, struct iattr *sattr)
3626 {
3627         struct nfs4_exception exception = { };
3628         struct nfs4_label l, *label = NULL;
3629         int err;
3630
3631         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3632
3633         do {
3634                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3635                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3636                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3637                                 &exception);
3638         } while (exception.retry);
3639
3640         nfs4_label_release_security(label);
3641         return err;
3642 }
3643
3644 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3645                 struct iattr *sattr, struct nfs4_label *label)
3646 {
3647         struct nfs4_createdata *data;
3648         int status = -ENOMEM;
3649
3650         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3651         if (data == NULL)
3652                 goto out;
3653
3654         data->arg.label = label;
3655         status = nfs4_do_create(dir, dentry, data);
3656
3657         nfs4_free_createdata(data);
3658 out:
3659         return status;
3660 }
3661
3662 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3663                 struct iattr *sattr)
3664 {
3665         struct nfs4_exception exception = { };
3666         struct nfs4_label l, *label = NULL;
3667         int err;
3668
3669         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3670
3671         sattr->ia_mode &= ~current_umask();
3672         do {
3673                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3674                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3675                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3676                                 &exception);
3677         } while (exception.retry);
3678         nfs4_label_release_security(label);
3679
3680         return err;
3681 }
3682
3683 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3684                 u64 cookie, struct page **pages, unsigned int count, int plus)
3685 {
3686         struct inode            *dir = dentry->d_inode;
3687         struct nfs4_readdir_arg args = {
3688                 .fh = NFS_FH(dir),
3689                 .pages = pages,
3690                 .pgbase = 0,
3691                 .count = count,
3692                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3693                 .plus = plus,
3694         };
3695         struct nfs4_readdir_res res;
3696         struct rpc_message msg = {
3697                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3698                 .rpc_argp = &args,
3699                 .rpc_resp = &res,
3700                 .rpc_cred = cred,
3701         };
3702         int                     status;
3703
3704         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3705                         dentry->d_parent->d_name.name,
3706                         dentry->d_name.name,
3707                         (unsigned long long)cookie);
3708         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3709         res.pgbase = args.pgbase;
3710         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3711         if (status >= 0) {
3712                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3713                 status += args.pgbase;
3714         }
3715
3716         nfs_invalidate_atime(dir);
3717
3718         dprintk("%s: returns %d\n", __func__, status);
3719         return status;
3720 }
3721
3722 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3723                 u64 cookie, struct page **pages, unsigned int count, int plus)
3724 {
3725         struct nfs4_exception exception = { };
3726         int err;
3727         do {
3728                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3729                                 pages, count, plus);
3730                 trace_nfs4_readdir(dentry->d_inode, err);
3731                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3732                                 &exception);
3733         } while (exception.retry);
3734         return err;
3735 }
3736
3737 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3738                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3739 {
3740         struct nfs4_createdata *data;
3741         int mode = sattr->ia_mode;
3742         int status = -ENOMEM;
3743
3744         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3745         if (data == NULL)
3746                 goto out;
3747
3748         if (S_ISFIFO(mode))
3749                 data->arg.ftype = NF4FIFO;
3750         else if (S_ISBLK(mode)) {
3751                 data->arg.ftype = NF4BLK;
3752                 data->arg.u.device.specdata1 = MAJOR(rdev);
3753                 data->arg.u.device.specdata2 = MINOR(rdev);
3754         }
3755         else if (S_ISCHR(mode)) {
3756                 data->arg.ftype = NF4CHR;
3757                 data->arg.u.device.specdata1 = MAJOR(rdev);
3758                 data->arg.u.device.specdata2 = MINOR(rdev);
3759         } else if (!S_ISSOCK(mode)) {
3760                 status = -EINVAL;
3761                 goto out_free;
3762         }
3763
3764         data->arg.label = label;
3765         status = nfs4_do_create(dir, dentry, data);
3766 out_free:
3767         nfs4_free_createdata(data);
3768 out:
3769         return status;
3770 }
3771
3772 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3773                 struct iattr *sattr, dev_t rdev)
3774 {
3775         struct nfs4_exception exception = { };
3776         struct nfs4_label l, *label = NULL;
3777         int err;
3778
3779         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3780
3781         sattr->ia_mode &= ~current_umask();
3782         do {
3783                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3784                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3785                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3786                                 &exception);
3787         } while (exception.retry);
3788
3789         nfs4_label_release_security(label);
3790
3791         return err;
3792 }
3793
3794 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3795                  struct nfs_fsstat *fsstat)
3796 {
3797         struct nfs4_statfs_arg args = {
3798                 .fh = fhandle,
3799                 .bitmask = server->attr_bitmask,
3800         };
3801         struct nfs4_statfs_res res = {
3802                 .fsstat = fsstat,
3803         };
3804         struct rpc_message msg = {
3805                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3806                 .rpc_argp = &args,
3807                 .rpc_resp = &res,
3808         };
3809
3810         nfs_fattr_init(fsstat->fattr);
3811         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3812 }
3813
3814 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3815 {
3816         struct nfs4_exception exception = { };
3817         int err;
3818         do {
3819                 err = nfs4_handle_exception(server,
3820                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3821                                 &exception);
3822         } while (exception.retry);
3823         return err;
3824 }
3825
3826 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3827                 struct nfs_fsinfo *fsinfo)
3828 {
3829         struct nfs4_fsinfo_arg args = {
3830                 .fh = fhandle,
3831                 .bitmask = server->attr_bitmask,
3832         };
3833         struct nfs4_fsinfo_res res = {
3834                 .fsinfo = fsinfo,
3835         };
3836         struct rpc_message msg = {
3837                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3838                 .rpc_argp = &args,
3839                 .rpc_resp = &res,
3840         };
3841
3842         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3843 }
3844
3845 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3846 {
3847         struct nfs4_exception exception = { };
3848         unsigned long now = jiffies;
3849         int err;
3850
3851         do {
3852                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3853                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3854                 if (err == 0) {
3855                         struct nfs_client *clp = server->nfs_client;
3856
3857                         spin_lock(&clp->cl_lock);
3858                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3859                         clp->cl_last_renewal = now;
3860                         spin_unlock(&clp->cl_lock);
3861                         break;
3862                 }
3863                 err = nfs4_handle_exception(server, err, &exception);
3864         } while (exception.retry);
3865         return err;
3866 }
3867
3868 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3869 {
3870         int error;
3871
3872         nfs_fattr_init(fsinfo->fattr);
3873         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3874         if (error == 0) {
3875                 /* block layout checks this! */
3876                 server->pnfs_blksize = fsinfo->blksize;
3877                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3878         }
3879
3880         return error;
3881 }
3882
3883 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3884                 struct nfs_pathconf *pathconf)
3885 {
3886         struct nfs4_pathconf_arg args = {
3887                 .fh = fhandle,
3888                 .bitmask = server->attr_bitmask,
3889         };
3890         struct nfs4_pathconf_res res = {
3891                 .pathconf = pathconf,
3892         };
3893         struct rpc_message msg = {
3894                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3895                 .rpc_argp = &args,
3896                 .rpc_resp = &res,
3897         };
3898
3899         /* None of the pathconf attributes are mandatory to implement */
3900         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3901                 memset(pathconf, 0, sizeof(*pathconf));
3902                 return 0;
3903         }
3904
3905         nfs_fattr_init(pathconf->fattr);
3906         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3907 }
3908
3909 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3910                 struct nfs_pathconf *pathconf)
3911 {
3912         struct nfs4_exception exception = { };
3913         int err;
3914
3915         do {
3916                 err = nfs4_handle_exception(server,
3917                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3918                                 &exception);
3919         } while (exception.retry);
3920         return err;
3921 }
3922
3923 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3924                 const struct nfs_open_context *ctx,
3925                 const struct nfs_lock_context *l_ctx,
3926                 fmode_t fmode)
3927 {
3928         const struct nfs_lockowner *lockowner = NULL;
3929
3930         if (l_ctx != NULL)
3931                 lockowner = &l_ctx->lockowner;
3932         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3933 }
3934 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3935
3936 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3937                 const struct nfs_open_context *ctx,
3938                 const struct nfs_lock_context *l_ctx,
3939                 fmode_t fmode)
3940 {
3941         nfs4_stateid current_stateid;
3942
3943         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3944                 return false;
3945         return nfs4_stateid_match(stateid, &current_stateid);
3946 }
3947
3948 static bool nfs4_error_stateid_expired(int err)
3949 {
3950         switch (err) {
3951         case -NFS4ERR_DELEG_REVOKED:
3952         case -NFS4ERR_ADMIN_REVOKED:
3953         case -NFS4ERR_BAD_STATEID:
3954         case -NFS4ERR_STALE_STATEID:
3955         case -NFS4ERR_OLD_STATEID:
3956         case -NFS4ERR_OPENMODE:
3957         case -NFS4ERR_EXPIRED:
3958                 return true;
3959         }
3960         return false;
3961 }
3962
3963 void __nfs4_read_done_cb(struct nfs_read_data *data)
3964 {
3965         nfs_invalidate_atime(data->header->inode);
3966 }
3967
3968 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3969 {
3970         struct nfs_server *server = NFS_SERVER(data->header->inode);
3971
3972         trace_nfs4_read(data, task->tk_status);
3973         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3974                 rpc_restart_call_prepare(task);
3975                 return -EAGAIN;
3976         }
3977
3978         __nfs4_read_done_cb(data);
3979         if (task->tk_status > 0)
3980                 renew_lease(server, data->timestamp);
3981         return 0;
3982 }
3983
3984 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3985                 struct nfs_readargs *args)
3986 {
3987
3988         if (!nfs4_error_stateid_expired(task->tk_status) ||
3989                 nfs4_stateid_is_current(&args->stateid,
3990                                 args->context,
3991                                 args->lock_context,
3992                                 FMODE_READ))
3993                 return false;
3994         rpc_restart_call_prepare(task);
3995         return true;
3996 }
3997
3998 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3999 {
4000
4001         dprintk("--> %s\n", __func__);
4002
4003         if (!nfs4_sequence_done(task, &data->res.seq_res))
4004                 return -EAGAIN;
4005         if (nfs4_read_stateid_changed(task, &data->args))
4006                 return -EAGAIN;
4007         return data->read_done_cb ? data->read_done_cb(task, data) :
4008                                     nfs4_read_done_cb(task, data);
4009 }
4010
4011 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4012 {
4013         data->timestamp   = jiffies;
4014         data->read_done_cb = nfs4_read_done_cb;
4015         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4016         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4017 }
4018
4019 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4020 {
4021         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4022                         &data->args.seq_args,
4023                         &data->res.seq_res,
4024                         task))
4025                 return;
4026         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4027                         data->args.lock_context, FMODE_READ);
4028 }
4029
4030 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4031 {
4032         struct inode *inode = data->header->inode;
4033
4034         trace_nfs4_write(data, task->tk_status);
4035         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4036                 rpc_restart_call_prepare(task);
4037                 return -EAGAIN;
4038         }
4039         if (task->tk_status >= 0) {
4040                 renew_lease(NFS_SERVER(inode), data->timestamp);
4041                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4042         }
4043         return 0;
4044 }
4045
4046 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4047                 struct nfs_writeargs *args)
4048 {
4049
4050         if (!nfs4_error_stateid_expired(task->tk_status) ||
4051                 nfs4_stateid_is_current(&args->stateid,
4052                                 args->context,
4053                                 args->lock_context,
4054                                 FMODE_WRITE))
4055                 return false;
4056         rpc_restart_call_prepare(task);
4057         return true;
4058 }
4059
4060 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4061 {
4062         if (!nfs4_sequence_done(task, &data->res.seq_res))
4063                 return -EAGAIN;
4064         if (nfs4_write_stateid_changed(task, &data->args))
4065                 return -EAGAIN;
4066         return data->write_done_cb ? data->write_done_cb(task, data) :
4067                 nfs4_write_done_cb(task, data);
4068 }
4069
4070 static
4071 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4072 {
4073         const struct nfs_pgio_header *hdr = data->header;
4074
4075         /* Don't request attributes for pNFS or O_DIRECT writes */
4076         if (data->ds_clp != NULL || hdr->dreq != NULL)
4077                 return false;
4078         /* Otherwise, request attributes if and only if we don't hold
4079          * a delegation
4080          */
4081         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4082 }
4083
4084 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4085 {
4086         struct nfs_server *server = NFS_SERVER(data->header->inode);
4087
4088         if (!nfs4_write_need_cache_consistency_data(data)) {
4089                 data->args.bitmask = NULL;
4090                 data->res.fattr = NULL;
4091         } else
4092                 data->args.bitmask = server->cache_consistency_bitmask;
4093
4094         if (!data->write_done_cb)
4095                 data->write_done_cb = nfs4_write_done_cb;
4096         data->res.server = server;
4097         data->timestamp   = jiffies;
4098
4099         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4100         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4101 }
4102
4103 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4104 {
4105         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4106                         &data->args.seq_args,
4107                         &data->res.seq_res,
4108                         task))
4109                 return;
4110         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4111                         data->args.lock_context, FMODE_WRITE);
4112 }
4113
4114 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4115 {
4116         nfs4_setup_sequence(NFS_SERVER(data->inode),
4117                         &data->args.seq_args,
4118                         &data->res.seq_res,
4119                         task);
4120 }
4121
4122 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4123 {
4124         struct inode *inode = data->inode;
4125
4126         trace_nfs4_commit(data, task->tk_status);
4127         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4128                 rpc_restart_call_prepare(task);
4129                 return -EAGAIN;
4130         }
4131         return 0;
4132 }
4133
4134 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4135 {
4136         if (!nfs4_sequence_done(task, &data->res.seq_res))
4137                 return -EAGAIN;
4138         return data->commit_done_cb(task, data);
4139 }
4140
4141 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4142 {
4143         struct nfs_server *server = NFS_SERVER(data->inode);
4144
4145         if (data->commit_done_cb == NULL)
4146                 data->commit_done_cb = nfs4_commit_done_cb;
4147         data->res.server = server;
4148         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4149         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4150 }
4151
4152 struct nfs4_renewdata {
4153         struct nfs_client       *client;
4154         unsigned long           timestamp;
4155 };
4156
4157 /*
4158  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4159  * standalone procedure for queueing an asynchronous RENEW.
4160  */
4161 static void nfs4_renew_release(void *calldata)
4162 {
4163         struct nfs4_renewdata *data = calldata;
4164         struct nfs_client *clp = data->client;
4165
4166         if (atomic_read(&clp->cl_count) > 1)
4167                 nfs4_schedule_state_renewal(clp);
4168         nfs_put_client(clp);
4169         kfree(data);
4170 }
4171
4172 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4173 {
4174         struct nfs4_renewdata *data = calldata;
4175         struct nfs_client *clp = data->client;
4176         unsigned long timestamp = data->timestamp;
4177
4178         trace_nfs4_renew_async(clp, task->tk_status);
4179         if (task->tk_status < 0) {
4180                 /* Unless we're shutting down, schedule state recovery! */
4181                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4182                         return;
4183                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4184                         nfs4_schedule_lease_recovery(clp);
4185                         return;
4186                 }
4187                 nfs4_schedule_path_down_recovery(clp);
4188         }
4189         do_renew_lease(clp, timestamp);
4190 }
4191
4192 static const struct rpc_call_ops nfs4_renew_ops = {
4193         .rpc_call_done = nfs4_renew_done,
4194         .rpc_release = nfs4_renew_release,
4195 };
4196
4197 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4198 {
4199         struct rpc_message msg = {
4200                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4201                 .rpc_argp       = clp,
4202                 .rpc_cred       = cred,
4203         };
4204         struct nfs4_renewdata *data;
4205
4206         if (renew_flags == 0)
4207                 return 0;
4208         if (!atomic_inc_not_zero(&clp->cl_count))
4209                 return -EIO;
4210         data = kmalloc(sizeof(*data), GFP_NOFS);
4211         if (data == NULL)
4212                 return -ENOMEM;
4213         data->client = clp;
4214         data->timestamp = jiffies;
4215         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4216                         &nfs4_renew_ops, data);
4217 }
4218
4219 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4220 {
4221         struct rpc_message msg = {
4222                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4223                 .rpc_argp       = clp,
4224                 .rpc_cred       = cred,
4225         };
4226         unsigned long now = jiffies;
4227         int status;
4228
4229         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4230         if (status < 0)
4231                 return status;
4232         do_renew_lease(clp, now);
4233         return 0;
4234 }
4235
4236 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4237 {
4238         return (server->caps & NFS_CAP_ACLS)
4239                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4240                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4241 }
4242
4243 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4244  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4245  * the stack.
4246  */
4247 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4248
4249 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4250                 struct page **pages, unsigned int *pgbase)
4251 {
4252         struct page *newpage, **spages;
4253         int rc = 0;
4254         size_t len;
4255         spages = pages;
4256
4257         do {
4258                 len = min_t(size_t, PAGE_SIZE, buflen);
4259                 newpage = alloc_page(GFP_KERNEL);
4260
4261                 if (newpage == NULL)
4262                         goto unwind;
4263                 memcpy(page_address(newpage), buf, len);
4264                 buf += len;
4265                 buflen -= len;
4266                 *pages++ = newpage;
4267                 rc++;
4268         } while (buflen != 0);
4269
4270         return rc;
4271
4272 unwind:
4273         for(; rc > 0; rc--)
4274                 __free_page(spages[rc-1]);
4275         return -ENOMEM;
4276 }
4277
4278 struct nfs4_cached_acl {
4279         int cached;
4280         size_t len;
4281         char data[0];
4282 };
4283
4284 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4285 {
4286         struct nfs_inode *nfsi = NFS_I(inode);
4287
4288         spin_lock(&inode->i_lock);
4289         kfree(nfsi->nfs4_acl);
4290         nfsi->nfs4_acl = acl;
4291         spin_unlock(&inode->i_lock);
4292 }
4293
4294 static void nfs4_zap_acl_attr(struct inode *inode)
4295 {
4296         nfs4_set_cached_acl(inode, NULL);
4297 }
4298
4299 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4300 {
4301         struct nfs_inode *nfsi = NFS_I(inode);
4302         struct nfs4_cached_acl *acl;
4303         int ret = -ENOENT;
4304
4305         spin_lock(&inode->i_lock);
4306         acl = nfsi->nfs4_acl;
4307         if (acl == NULL)
4308                 goto out;
4309         if (buf == NULL) /* user is just asking for length */
4310                 goto out_len;
4311         if (acl->cached == 0)
4312                 goto out;
4313         ret = -ERANGE; /* see getxattr(2) man page */
4314         if (acl->len > buflen)
4315                 goto out;
4316         memcpy(buf, acl->data, acl->len);
4317 out_len:
4318         ret = acl->len;
4319 out:
4320         spin_unlock(&inode->i_lock);
4321         return ret;
4322 }
4323
4324 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4325 {
4326         struct nfs4_cached_acl *acl;
4327         size_t buflen = sizeof(*acl) + acl_len;
4328
4329         if (buflen <= PAGE_SIZE) {
4330                 acl = kmalloc(buflen, GFP_KERNEL);
4331                 if (acl == NULL)
4332                         goto out;
4333                 acl->cached = 1;
4334                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4335         } else {
4336                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4337                 if (acl == NULL)
4338                         goto out;
4339                 acl->cached = 0;
4340         }
4341         acl->len = acl_len;
4342 out:
4343         nfs4_set_cached_acl(inode, acl);
4344 }
4345
4346 /*
4347  * The getxattr API returns the required buffer length when called with a
4348  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4349  * the required buf.  On a NULL buf, we send a page of data to the server
4350  * guessing that the ACL request can be serviced by a page. If so, we cache
4351  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4352  * the cache. If not so, we throw away the page, and cache the required
4353  * length. The next getxattr call will then produce another round trip to
4354  * the server, this time with the input buf of the required size.
4355  */
4356 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4357 {
4358         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4359         struct nfs_getaclargs args = {
4360                 .fh = NFS_FH(inode),
4361                 .acl_pages = pages,
4362                 .acl_len = buflen,
4363         };
4364         struct nfs_getaclres res = {
4365                 .acl_len = buflen,
4366         };
4367         struct rpc_message msg = {
4368                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4369                 .rpc_argp = &args,
4370                 .rpc_resp = &res,
4371         };
4372         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4373         int ret = -ENOMEM, i;
4374
4375         /* As long as we're doing a round trip to the server anyway,
4376          * let's be prepared for a page of acl data. */
4377         if (npages == 0)
4378                 npages = 1;
4379         if (npages > ARRAY_SIZE(pages))
4380                 return -ERANGE;
4381
4382         for (i = 0; i < npages; i++) {
4383                 pages[i] = alloc_page(GFP_KERNEL);
4384                 if (!pages[i])
4385                         goto out_free;
4386         }
4387
4388         /* for decoding across pages */
4389         res.acl_scratch = alloc_page(GFP_KERNEL);
4390         if (!res.acl_scratch)
4391                 goto out_free;
4392
4393         args.acl_len = npages * PAGE_SIZE;
4394         args.acl_pgbase = 0;
4395
4396         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4397                 __func__, buf, buflen, npages, args.acl_len);
4398         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4399                              &msg, &args.seq_args, &res.seq_res, 0);
4400         if (ret)
4401                 goto out_free;
4402
4403         /* Handle the case where the passed-in buffer is too short */
4404         if (res.acl_flags & NFS4_ACL_TRUNC) {
4405                 /* Did the user only issue a request for the acl length? */
4406                 if (buf == NULL)
4407                         goto out_ok;
4408                 ret = -ERANGE;
4409                 goto out_free;
4410         }
4411         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4412         if (buf) {
4413                 if (res.acl_len > buflen) {
4414                         ret = -ERANGE;
4415                         goto out_free;
4416                 }
4417                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4418         }
4419 out_ok:
4420         ret = res.acl_len;
4421 out_free:
4422         for (i = 0; i < npages; i++)
4423                 if (pages[i])
4424                         __free_page(pages[i]);
4425         if (res.acl_scratch)
4426                 __free_page(res.acl_scratch);
4427         return ret;
4428 }
4429
4430 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4431 {
4432         struct nfs4_exception exception = { };
4433         ssize_t ret;
4434         do {
4435                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4436                 trace_nfs4_get_acl(inode, ret);
4437                 if (ret >= 0)
4438                         break;
4439                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4440         } while (exception.retry);
4441         return ret;
4442 }
4443
4444 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4445 {
4446         struct nfs_server *server = NFS_SERVER(inode);
4447         int ret;
4448
4449         if (!nfs4_server_supports_acls(server))
4450                 return -EOPNOTSUPP;
4451         ret = nfs_revalidate_inode(server, inode);
4452         if (ret < 0)
4453                 return ret;
4454         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4455                 nfs_zap_acl_cache(inode);
4456         ret = nfs4_read_cached_acl(inode, buf, buflen);
4457         if (ret != -ENOENT)
4458                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4459                  * but no cached acl data, just the acl length */
4460                 return ret;
4461         return nfs4_get_acl_uncached(inode, buf, buflen);
4462 }
4463
4464 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4465 {
4466         struct nfs_server *server = NFS_SERVER(inode);
4467         struct page *pages[NFS4ACL_MAXPAGES];
4468         struct nfs_setaclargs arg = {
4469                 .fh             = NFS_FH(inode),
4470                 .acl_pages      = pages,
4471                 .acl_len        = buflen,
4472         };
4473         struct nfs_setaclres res;
4474         struct rpc_message msg = {
4475                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4476                 .rpc_argp       = &arg,
4477                 .rpc_resp       = &res,
4478         };
4479         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4480         int ret, i;
4481
4482         if (!nfs4_server_supports_acls(server))
4483                 return -EOPNOTSUPP;
4484         if (npages > ARRAY_SIZE(pages))
4485                 return -ERANGE;
4486         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4487         if (i < 0)
4488                 return i;
4489         nfs4_inode_return_delegation(inode);
4490         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4491
4492         /*
4493          * Free each page after tx, so the only ref left is
4494          * held by the network stack
4495          */
4496         for (; i > 0; i--)
4497                 put_page(pages[i-1]);
4498
4499         /*
4500          * Acl update can result in inode attribute update.
4501          * so mark the attribute cache invalid.
4502          */
4503         spin_lock(&inode->i_lock);
4504         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4505         spin_unlock(&inode->i_lock);
4506         nfs_access_zap_cache(inode);
4507         nfs_zap_acl_cache(inode);
4508         return ret;
4509 }
4510
4511 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4512 {
4513         struct nfs4_exception exception = { };
4514         int err;
4515         do {
4516                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4517                 trace_nfs4_set_acl(inode, err);
4518                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4519                                 &exception);
4520         } while (exception.retry);
4521         return err;
4522 }
4523
4524 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4525 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4526                                         size_t buflen)
4527 {
4528         struct nfs_server *server = NFS_SERVER(inode);
4529         struct nfs_fattr fattr;
4530         struct nfs4_label label = {0, 0, buflen, buf};
4531
4532         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4533         struct nfs4_getattr_arg args = {
4534                 .fh             = NFS_FH(inode),
4535                 .bitmask        = bitmask,
4536         };
4537         struct nfs4_getattr_res res = {
4538                 .fattr          = &fattr,
4539                 .label          = &label,
4540                 .server         = server,
4541         };
4542         struct rpc_message msg = {
4543                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4544                 .rpc_argp       = &args,
4545                 .rpc_resp       = &res,
4546         };
4547         int ret;
4548
4549         nfs_fattr_init(&fattr);
4550
4551         ret = rpc_call_sync(server->client, &msg, 0);
4552         if (ret)
4553                 return ret;
4554         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4555                 return -ENOENT;
4556         if (buflen < label.len)
4557                 return -ERANGE;
4558         return 0;
4559 }
4560
4561 static int nfs4_get_security_label(struct inode *inode, void *buf,
4562                                         size_t buflen)
4563 {
4564         struct nfs4_exception exception = { };
4565         int err;
4566
4567         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4568                 return -EOPNOTSUPP;
4569
4570         do {
4571                 err = _nfs4_get_security_label(inode, buf, buflen);
4572                 trace_nfs4_get_security_label(inode, err);
4573                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4574                                 &exception);
4575         } while (exception.retry);
4576         return err;
4577 }
4578
4579 static int _nfs4_do_set_security_label(struct inode *inode,
4580                 struct nfs4_label *ilabel,
4581                 struct nfs_fattr *fattr,
4582                 struct nfs4_label *olabel)
4583 {
4584
4585         struct iattr sattr = {0};
4586         struct nfs_server *server = NFS_SERVER(inode);
4587         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4588         struct nfs_setattrargs args = {
4589                 .fh             = NFS_FH(inode),
4590                 .iap            = &sattr,
4591                 .server         = server,
4592                 .bitmask        = bitmask,
4593                 .label          = ilabel,
4594         };
4595         struct nfs_setattrres res = {
4596                 .fattr          = fattr,
4597                 .label          = olabel,
4598                 .server         = server,
4599         };
4600         struct rpc_message msg = {
4601                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4602                 .rpc_argp       = &args,
4603                 .rpc_resp       = &res,
4604         };
4605         int status;
4606
4607         nfs4_stateid_copy(&args.stateid, &zero_stateid);
4608
4609         status = rpc_call_sync(server->client, &msg, 0);
4610         if (status)
4611                 dprintk("%s failed: %d\n", __func__, status);
4612
4613         return status;
4614 }
4615
4616 static int nfs4_do_set_security_label(struct inode *inode,
4617                 struct nfs4_label *ilabel,
4618                 struct nfs_fattr *fattr,
4619                 struct nfs4_label *olabel)
4620 {
4621         struct nfs4_exception exception = { };
4622         int err;
4623
4624         do {
4625                 err = _nfs4_do_set_security_label(inode, ilabel,
4626                                 fattr, olabel);
4627                 trace_nfs4_set_security_label(inode, err);
4628                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4629                                 &exception);
4630         } while (exception.retry);
4631         return err;
4632 }
4633
4634 static int
4635 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4636 {
4637         struct nfs4_label ilabel, *olabel = NULL;
4638         struct nfs_fattr fattr;
4639         struct rpc_cred *cred;
4640         struct inode *inode = dentry->d_inode;
4641         int status;
4642
4643         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4644                 return -EOPNOTSUPP;
4645
4646         nfs_fattr_init(&fattr);
4647
4648         ilabel.pi = 0;
4649         ilabel.lfs = 0;
4650         ilabel.label = (char *)buf;
4651         ilabel.len = buflen;
4652
4653         cred = rpc_lookup_cred();
4654         if (IS_ERR(cred))
4655                 return PTR_ERR(cred);
4656
4657         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4658         if (IS_ERR(olabel)) {
4659                 status = -PTR_ERR(olabel);
4660                 goto out;
4661         }
4662
4663         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4664         if (status == 0)
4665                 nfs_setsecurity(inode, &fattr, olabel);
4666
4667         nfs4_label_free(olabel);
4668 out:
4669         put_rpccred(cred);
4670         return status;
4671 }
4672 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4673
4674
4675 static int
4676 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4677 {
4678         struct nfs_client *clp = server->nfs_client;
4679
4680         if (task->tk_status >= 0)
4681                 return 0;
4682         switch(task->tk_status) {
4683                 case -NFS4ERR_DELEG_REVOKED:
4684                 case -NFS4ERR_ADMIN_REVOKED:
4685                 case -NFS4ERR_BAD_STATEID:
4686                         if (state == NULL)
4687                                 break;
4688                         nfs_remove_bad_delegation(state->inode);
4689                 case -NFS4ERR_OPENMODE:
4690                         if (state == NULL)
4691                                 break;
4692                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4693                                 goto stateid_invalid;
4694                         goto wait_on_recovery;
4695                 case -NFS4ERR_EXPIRED:
4696                         if (state != NULL) {
4697                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4698                                         goto stateid_invalid;
4699                         }
4700                 case -NFS4ERR_STALE_STATEID:
4701                 case -NFS4ERR_STALE_CLIENTID:
4702                         nfs4_schedule_lease_recovery(clp);
4703                         goto wait_on_recovery;
4704 #if defined(CONFIG_NFS_V4_1)
4705                 case -NFS4ERR_BADSESSION:
4706                 case -NFS4ERR_BADSLOT:
4707                 case -NFS4ERR_BAD_HIGH_SLOT:
4708                 case -NFS4ERR_DEADSESSION:
4709                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4710                 case -NFS4ERR_SEQ_FALSE_RETRY:
4711                 case -NFS4ERR_SEQ_MISORDERED:
4712                         dprintk("%s ERROR %d, Reset session\n", __func__,
4713                                 task->tk_status);
4714                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4715                         task->tk_status = 0;
4716                         return -EAGAIN;
4717 #endif /* CONFIG_NFS_V4_1 */
4718                 case -NFS4ERR_DELAY:
4719                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4720                 case -NFS4ERR_GRACE:
4721                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4722                         task->tk_status = 0;
4723                         return -EAGAIN;
4724                 case -NFS4ERR_RETRY_UNCACHED_REP:
4725                 case -NFS4ERR_OLD_STATEID:
4726                         task->tk_status = 0;
4727                         return -EAGAIN;
4728         }
4729         task->tk_status = nfs4_map_errors(task->tk_status);
4730         return 0;
4731 stateid_invalid:
4732         task->tk_status = -EIO;
4733         return 0;
4734 wait_on_recovery:
4735         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4736         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4737                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4738         task->tk_status = 0;
4739         return -EAGAIN;
4740 }
4741
4742 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4743                                     nfs4_verifier *bootverf)
4744 {
4745         __be32 verf[2];
4746
4747         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4748                 /* An impossible timestamp guarantees this value
4749                  * will never match a generated boot time. */
4750                 verf[0] = 0;
4751                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4752         } else {
4753                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4754                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4755                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4756         }
4757         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4758 }
4759
4760 static unsigned int
4761 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4762                                    char *buf, size_t len)
4763 {
4764         unsigned int result;
4765
4766         rcu_read_lock();
4767         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4768                                 clp->cl_ipaddr,
4769                                 rpc_peeraddr2str(clp->cl_rpcclient,
4770                                                         RPC_DISPLAY_ADDR),
4771                                 rpc_peeraddr2str(clp->cl_rpcclient,
4772                                                         RPC_DISPLAY_PROTO));
4773         rcu_read_unlock();
4774         return result;
4775 }
4776
4777 static unsigned int
4778 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4779                                 char *buf, size_t len)
4780 {
4781         const char *nodename = clp->cl_rpcclient->cl_nodename;
4782
4783         if (nfs4_client_id_uniquifier[0] != '\0')
4784                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4785                                 clp->rpc_ops->version,
4786                                 clp->cl_minorversion,
4787                                 nfs4_client_id_uniquifier,
4788                                 nodename);
4789         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4790                                 clp->rpc_ops->version, clp->cl_minorversion,
4791                                 nodename);
4792 }
4793
4794 /**
4795  * nfs4_proc_setclientid - Negotiate client ID
4796  * @clp: state data structure
4797  * @program: RPC program for NFSv4 callback service
4798  * @port: IP port number for NFS4 callback service
4799  * @cred: RPC credential to use for this call
4800  * @res: where to place the result
4801  *
4802  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4803  */
4804 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4805                 unsigned short port, struct rpc_cred *cred,
4806                 struct nfs4_setclientid_res *res)
4807 {
4808         nfs4_verifier sc_verifier;
4809         struct nfs4_setclientid setclientid = {
4810                 .sc_verifier = &sc_verifier,
4811                 .sc_prog = program,
4812                 .sc_cb_ident = clp->cl_cb_ident,
4813         };
4814         struct rpc_message msg = {
4815                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4816                 .rpc_argp = &setclientid,
4817                 .rpc_resp = res,
4818                 .rpc_cred = cred,
4819         };
4820         int status;
4821
4822         /* nfs_client_id4 */
4823         nfs4_init_boot_verifier(clp, &sc_verifier);
4824         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4825                 setclientid.sc_name_len =
4826                                 nfs4_init_uniform_client_string(clp,
4827                                                 setclientid.sc_name,
4828                                                 sizeof(setclientid.sc_name));
4829         else
4830                 setclientid.sc_name_len =
4831                                 nfs4_init_nonuniform_client_string(clp,
4832                                                 setclientid.sc_name,
4833                                                 sizeof(setclientid.sc_name));
4834         /* cb_client4 */
4835         rcu_read_lock();
4836         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4837                                 sizeof(setclientid.sc_netid), "%s",
4838                                 rpc_peeraddr2str(clp->cl_rpcclient,
4839                                                         RPC_DISPLAY_NETID));
4840         rcu_read_unlock();
4841         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4842                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4843                                 clp->cl_ipaddr, port >> 8, port & 255);
4844
4845         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4846                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4847                 setclientid.sc_name_len, setclientid.sc_name);
4848         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4849         trace_nfs4_setclientid(clp, status);
4850         dprintk("NFS reply setclientid: %d\n", status);
4851         return status;
4852 }
4853
4854 /**
4855  * nfs4_proc_setclientid_confirm - Confirm client ID
4856  * @clp: state data structure
4857  * @res: result of a previous SETCLIENTID
4858  * @cred: RPC credential to use for this call
4859  *
4860  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4861  */
4862 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4863                 struct nfs4_setclientid_res *arg,
4864                 struct rpc_cred *cred)
4865 {
4866         struct rpc_message msg = {
4867                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4868                 .rpc_argp = arg,
4869                 .rpc_cred = cred,
4870         };
4871         int status;
4872
4873         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4874                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4875                 clp->cl_clientid);
4876         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4877         trace_nfs4_setclientid_confirm(clp, status);
4878         dprintk("NFS reply setclientid_confirm: %d\n", status);
4879         return status;
4880 }
4881
4882 struct nfs4_delegreturndata {
4883         struct nfs4_delegreturnargs args;
4884         struct nfs4_delegreturnres res;
4885         struct nfs_fh fh;
4886         nfs4_stateid stateid;
4887         unsigned long timestamp;
4888         struct nfs_fattr fattr;
4889         int rpc_status;
4890 };
4891
4892 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4893 {
4894         struct nfs4_delegreturndata *data = calldata;
4895
4896         if (!nfs4_sequence_done(task, &data->res.seq_res))
4897                 return;
4898
4899         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4900         switch (task->tk_status) {
4901         case -NFS4ERR_STALE_STATEID:
4902         case -NFS4ERR_EXPIRED:
4903         case 0:
4904                 renew_lease(data->res.server, data->timestamp);
4905                 break;
4906         default:
4907                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4908                                 -EAGAIN) {
4909                         rpc_restart_call_prepare(task);
4910                         return;
4911                 }
4912         }
4913         data->rpc_status = task->tk_status;
4914 }
4915
4916 static void nfs4_delegreturn_release(void *calldata)
4917 {
4918         kfree(calldata);
4919 }
4920
4921 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4922 {
4923         struct nfs4_delegreturndata *d_data;
4924
4925         d_data = (struct nfs4_delegreturndata *)data;
4926
4927         nfs4_setup_sequence(d_data->res.server,
4928                         &d_data->args.seq_args,
4929                         &d_data->res.seq_res,
4930                         task);
4931 }
4932
4933 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4934         .rpc_call_prepare = nfs4_delegreturn_prepare,
4935         .rpc_call_done = nfs4_delegreturn_done,
4936         .rpc_release = nfs4_delegreturn_release,
4937 };
4938
4939 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4940 {
4941         struct nfs4_delegreturndata *data;
4942         struct nfs_server *server = NFS_SERVER(inode);
4943         struct rpc_task *task;
4944         struct rpc_message msg = {
4945                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4946                 .rpc_cred = cred,
4947         };
4948         struct rpc_task_setup task_setup_data = {
4949                 .rpc_client = server->client,
4950                 .rpc_message = &msg,
4951                 .callback_ops = &nfs4_delegreturn_ops,
4952                 .flags = RPC_TASK_ASYNC,
4953         };
4954         int status = 0;
4955
4956         data = kzalloc(sizeof(*data), GFP_NOFS);
4957         if (data == NULL)
4958                 return -ENOMEM;
4959         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4960         data->args.fhandle = &data->fh;
4961         data->args.stateid = &data->stateid;
4962         data->args.bitmask = server->cache_consistency_bitmask;
4963         nfs_copy_fh(&data->fh, NFS_FH(inode));
4964         nfs4_stateid_copy(&data->stateid, stateid);
4965         data->res.fattr = &data->fattr;
4966         data->res.server = server;
4967         nfs_fattr_init(data->res.fattr);
4968         data->timestamp = jiffies;
4969         data->rpc_status = 0;
4970
4971         task_setup_data.callback_data = data;
4972         msg.rpc_argp = &data->args;
4973         msg.rpc_resp = &data->res;
4974         task = rpc_run_task(&task_setup_data);
4975         if (IS_ERR(task))
4976                 return PTR_ERR(task);
4977         if (!issync)
4978                 goto out;
4979         status = nfs4_wait_for_completion_rpc_task(task);
4980         if (status != 0)
4981                 goto out;
4982         status = data->rpc_status;
4983         if (status == 0)
4984                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4985         else
4986                 nfs_refresh_inode(inode, &data->fattr);
4987 out:
4988         rpc_put_task(task);
4989         return status;
4990 }
4991
4992 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4993 {
4994         struct nfs_server *server = NFS_SERVER(inode);
4995         struct nfs4_exception exception = { };
4996         int err;
4997         do {
4998                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4999                 trace_nfs4_delegreturn(inode, err);
5000                 switch (err) {
5001                         case -NFS4ERR_STALE_STATEID:
5002                         case -NFS4ERR_EXPIRED:
5003                         case 0:
5004                                 return 0;
5005                 }
5006                 err = nfs4_handle_exception(server, err, &exception);
5007         } while (exception.retry);
5008         return err;
5009 }
5010
5011 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5012 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5013
5014 /*
5015  * sleep, with exponential backoff, and retry the LOCK operation.
5016  */
5017 static unsigned long
5018 nfs4_set_lock_task_retry(unsigned long timeout)
5019 {
5020         freezable_schedule_timeout_killable_unsafe(timeout);
5021         timeout <<= 1;
5022         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5023                 return NFS4_LOCK_MAXTIMEOUT;
5024         return timeout;
5025 }
5026
5027 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5028 {
5029         struct inode *inode = state->inode;
5030         struct nfs_server *server = NFS_SERVER(inode);
5031         struct nfs_client *clp = server->nfs_client;
5032         struct nfs_lockt_args arg = {
5033                 .fh = NFS_FH(inode),
5034                 .fl = request,
5035         };
5036         struct nfs_lockt_res res = {
5037                 .denied = request,
5038         };
5039         struct rpc_message msg = {
5040                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5041                 .rpc_argp       = &arg,
5042                 .rpc_resp       = &res,
5043                 .rpc_cred       = state->owner->so_cred,
5044         };
5045         struct nfs4_lock_state *lsp;
5046         int status;
5047
5048         arg.lock_owner.clientid = clp->cl_clientid;
5049         status = nfs4_set_lock_state(state, request);
5050         if (status != 0)
5051                 goto out;
5052         lsp = request->fl_u.nfs4_fl.owner;
5053         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5054         arg.lock_owner.s_dev = server->s_dev;
5055         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5056         switch (status) {
5057                 case 0:
5058                         request->fl_type = F_UNLCK;
5059                         break;
5060                 case -NFS4ERR_DENIED:
5061                         status = 0;
5062         }
5063         request->fl_ops->fl_release_private(request);
5064 out:
5065         return status;
5066 }
5067
5068 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5069 {
5070         struct nfs4_exception exception = { };
5071         int err;
5072
5073         do {
5074                 err = _nfs4_proc_getlk(state, cmd, request);
5075                 trace_nfs4_get_lock(request, state, cmd, err);
5076                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5077                                 &exception);
5078         } while (exception.retry);
5079         return err;
5080 }
5081
5082 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5083 {
5084         int res = 0;
5085         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5086                 case FL_POSIX:
5087                         res = posix_lock_file_wait(file, fl);
5088                         break;
5089                 case FL_FLOCK:
5090                         res = flock_lock_file_wait(file, fl);
5091                         break;
5092                 default:
5093                         BUG();
5094         }
5095         return res;
5096 }
5097
5098 struct nfs4_unlockdata {
5099         struct nfs_locku_args arg;
5100         struct nfs_locku_res res;
5101         struct nfs4_lock_state *lsp;
5102         struct nfs_open_context *ctx;
5103         struct file_lock fl;
5104         const struct nfs_server *server;
5105         unsigned long timestamp;
5106 };
5107
5108 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5109                 struct nfs_open_context *ctx,
5110                 struct nfs4_lock_state *lsp,
5111                 struct nfs_seqid *seqid)
5112 {
5113         struct nfs4_unlockdata *p;
5114         struct inode *inode = lsp->ls_state->inode;
5115
5116         p = kzalloc(sizeof(*p), GFP_NOFS);
5117         if (p == NULL)
5118                 return NULL;
5119         p->arg.fh = NFS_FH(inode);
5120         p->arg.fl = &p->fl;
5121         p->arg.seqid = seqid;
5122         p->res.seqid = seqid;
5123         p->arg.stateid = &lsp->ls_stateid;
5124         p->lsp = lsp;
5125         atomic_inc(&lsp->ls_count);
5126         /* Ensure we don't close file until we're done freeing locks! */
5127         p->ctx = get_nfs_open_context(ctx);
5128         memcpy(&p->fl, fl, sizeof(p->fl));
5129         p->server = NFS_SERVER(inode);
5130         return p;
5131 }
5132
5133 static void nfs4_locku_release_calldata(void *data)
5134 {
5135         struct nfs4_unlockdata *calldata = data;
5136         nfs_free_seqid(calldata->arg.seqid);
5137         nfs4_put_lock_state(calldata->lsp);
5138         put_nfs_open_context(calldata->ctx);
5139         kfree(calldata);
5140 }
5141
5142 static void nfs4_locku_done(struct rpc_task *task, void *data)
5143 {
5144         struct nfs4_unlockdata *calldata = data;
5145
5146         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5147                 return;
5148         switch (task->tk_status) {
5149                 case 0:
5150                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5151                                         &calldata->res.stateid);
5152                         renew_lease(calldata->server, calldata->timestamp);
5153                         break;
5154                 case -NFS4ERR_BAD_STATEID:
5155                 case -NFS4ERR_OLD_STATEID:
5156                 case -NFS4ERR_STALE_STATEID:
5157                 case -NFS4ERR_EXPIRED:
5158                         break;
5159                 default:
5160                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5161                                 rpc_restart_call_prepare(task);
5162         }
5163         nfs_release_seqid(calldata->arg.seqid);
5164 }
5165
5166 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5167 {
5168         struct nfs4_unlockdata *calldata = data;
5169
5170         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5171                 goto out_wait;
5172         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5173                 /* Note: exit _without_ running nfs4_locku_done */
5174                 goto out_no_action;
5175         }
5176         calldata->timestamp = jiffies;
5177         if (nfs4_setup_sequence(calldata->server,
5178                                 &calldata->arg.seq_args,
5179                                 &calldata->res.seq_res,
5180                                 task) != 0)
5181                 nfs_release_seqid(calldata->arg.seqid);
5182         return;
5183 out_no_action:
5184         task->tk_action = NULL;
5185 out_wait:
5186         nfs4_sequence_done(task, &calldata->res.seq_res);
5187 }
5188
5189 static const struct rpc_call_ops nfs4_locku_ops = {
5190         .rpc_call_prepare = nfs4_locku_prepare,
5191         .rpc_call_done = nfs4_locku_done,
5192         .rpc_release = nfs4_locku_release_calldata,
5193 };
5194
5195 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5196                 struct nfs_open_context *ctx,
5197                 struct nfs4_lock_state *lsp,
5198                 struct nfs_seqid *seqid)
5199 {
5200         struct nfs4_unlockdata *data;
5201         struct rpc_message msg = {
5202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5203                 .rpc_cred = ctx->cred,
5204         };
5205         struct rpc_task_setup task_setup_data = {
5206                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5207                 .rpc_message = &msg,
5208                 .callback_ops = &nfs4_locku_ops,
5209                 .workqueue = nfsiod_workqueue,
5210                 .flags = RPC_TASK_ASYNC,
5211         };
5212
5213         /* Ensure this is an unlock - when canceling a lock, the
5214          * canceled lock is passed in, and it won't be an unlock.
5215          */
5216         fl->fl_type = F_UNLCK;
5217
5218         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5219         if (data == NULL) {
5220                 nfs_free_seqid(seqid);
5221                 return ERR_PTR(-ENOMEM);
5222         }
5223
5224         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5225         msg.rpc_argp = &data->arg;
5226         msg.rpc_resp = &data->res;
5227         task_setup_data.callback_data = data;
5228         return rpc_run_task(&task_setup_data);
5229 }
5230
5231 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5232 {
5233         struct inode *inode = state->inode;
5234         struct nfs4_state_owner *sp = state->owner;
5235         struct nfs_inode *nfsi = NFS_I(inode);
5236         struct nfs_seqid *seqid;
5237         struct nfs4_lock_state *lsp;
5238         struct rpc_task *task;
5239         int status = 0;
5240         unsigned char fl_flags = request->fl_flags;
5241
5242         status = nfs4_set_lock_state(state, request);
5243         /* Unlock _before_ we do the RPC call */
5244         request->fl_flags |= FL_EXISTS;
5245         /* Exclude nfs_delegation_claim_locks() */
5246         mutex_lock(&sp->so_delegreturn_mutex);
5247         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5248         down_read(&nfsi->rwsem);
5249         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5250                 up_read(&nfsi->rwsem);
5251                 mutex_unlock(&sp->so_delegreturn_mutex);
5252                 goto out;
5253         }
5254         up_read(&nfsi->rwsem);
5255         mutex_unlock(&sp->so_delegreturn_mutex);
5256         if (status != 0)
5257                 goto out;
5258         /* Is this a delegated lock? */
5259         lsp = request->fl_u.nfs4_fl.owner;
5260         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5261                 goto out;
5262         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5263         status = -ENOMEM;
5264         if (seqid == NULL)
5265                 goto out;
5266         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5267         status = PTR_ERR(task);
5268         if (IS_ERR(task))
5269                 goto out;
5270         status = nfs4_wait_for_completion_rpc_task(task);
5271         rpc_put_task(task);
5272 out:
5273         request->fl_flags = fl_flags;
5274         trace_nfs4_unlock(request, state, F_SETLK, status);
5275         return status;
5276 }
5277
5278 struct nfs4_lockdata {
5279         struct nfs_lock_args arg;
5280         struct nfs_lock_res res;
5281         struct nfs4_lock_state *lsp;
5282         struct nfs_open_context *ctx;
5283         struct file_lock fl;
5284         unsigned long timestamp;
5285         int rpc_status;
5286         int cancelled;
5287         struct nfs_server *server;
5288 };
5289
5290 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5291                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5292                 gfp_t gfp_mask)
5293 {
5294         struct nfs4_lockdata *p;
5295         struct inode *inode = lsp->ls_state->inode;
5296         struct nfs_server *server = NFS_SERVER(inode);
5297
5298         p = kzalloc(sizeof(*p), gfp_mask);
5299         if (p == NULL)
5300                 return NULL;
5301
5302         p->arg.fh = NFS_FH(inode);
5303         p->arg.fl = &p->fl;
5304         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5305         if (p->arg.open_seqid == NULL)
5306                 goto out_free;
5307         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5308         if (p->arg.lock_seqid == NULL)
5309                 goto out_free_seqid;
5310         p->arg.lock_stateid = &lsp->ls_stateid;
5311         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5312         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5313         p->arg.lock_owner.s_dev = server->s_dev;
5314         p->res.lock_seqid = p->arg.lock_seqid;
5315         p->lsp = lsp;
5316         p->server = server;
5317         atomic_inc(&lsp->ls_count);
5318         p->ctx = get_nfs_open_context(ctx);
5319         memcpy(&p->fl, fl, sizeof(p->fl));
5320         return p;
5321 out_free_seqid:
5322         nfs_free_seqid(p->arg.open_seqid);
5323 out_free:
5324         kfree(p);
5325         return NULL;
5326 }
5327
5328 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5329 {
5330         struct nfs4_lockdata *data = calldata;
5331         struct nfs4_state *state = data->lsp->ls_state;
5332
5333         dprintk("%s: begin!\n", __func__);
5334         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5335                 goto out_wait;
5336         /* Do we need to do an open_to_lock_owner? */
5337         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5338                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5339                         goto out_release_lock_seqid;
5340                 }
5341                 data->arg.open_stateid = &state->open_stateid;
5342                 data->arg.new_lock_owner = 1;
5343                 data->res.open_seqid = data->arg.open_seqid;
5344         } else
5345                 data->arg.new_lock_owner = 0;
5346         if (!nfs4_valid_open_stateid(state)) {
5347                 data->rpc_status = -EBADF;
5348                 task->tk_action = NULL;
5349                 goto out_release_open_seqid;
5350         }
5351         data->timestamp = jiffies;
5352         if (nfs4_setup_sequence(data->server,
5353                                 &data->arg.seq_args,
5354                                 &data->res.seq_res,
5355                                 task) == 0)
5356                 return;
5357 out_release_open_seqid:
5358         nfs_release_seqid(data->arg.open_seqid);
5359 out_release_lock_seqid:
5360         nfs_release_seqid(data->arg.lock_seqid);
5361 out_wait:
5362         nfs4_sequence_done(task, &data->res.seq_res);
5363         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5364 }
5365
5366 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5367 {
5368         struct nfs4_lockdata *data = calldata;
5369
5370         dprintk("%s: begin!\n", __func__);
5371
5372         if (!nfs4_sequence_done(task, &data->res.seq_res))
5373                 return;
5374
5375         data->rpc_status = task->tk_status;
5376         if (data->arg.new_lock_owner != 0) {
5377                 if (data->rpc_status == 0)
5378                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5379                 else
5380                         goto out;
5381         }
5382         if (data->rpc_status == 0) {
5383                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5384                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5385                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5386         }
5387 out:
5388         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5389 }
5390
5391 static void nfs4_lock_release(void *calldata)
5392 {
5393         struct nfs4_lockdata *data = calldata;
5394
5395         dprintk("%s: begin!\n", __func__);
5396         nfs_free_seqid(data->arg.open_seqid);
5397         if (data->cancelled != 0) {
5398                 struct rpc_task *task;
5399                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5400                                 data->arg.lock_seqid);
5401                 if (!IS_ERR(task))
5402                         rpc_put_task_async(task);
5403                 dprintk("%s: cancelling lock!\n", __func__);
5404         } else
5405                 nfs_free_seqid(data->arg.lock_seqid);
5406         nfs4_put_lock_state(data->lsp);
5407         put_nfs_open_context(data->ctx);
5408         kfree(data);
5409         dprintk("%s: done!\n", __func__);
5410 }
5411
5412 static const struct rpc_call_ops nfs4_lock_ops = {
5413         .rpc_call_prepare = nfs4_lock_prepare,
5414         .rpc_call_done = nfs4_lock_done,
5415         .rpc_release = nfs4_lock_release,
5416 };
5417
5418 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5419 {
5420         switch (error) {
5421         case -NFS4ERR_ADMIN_REVOKED:
5422         case -NFS4ERR_BAD_STATEID:
5423                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5424                 if (new_lock_owner != 0 ||
5425                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5426                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5427                 break;
5428         case -NFS4ERR_STALE_STATEID:
5429                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5430         case -NFS4ERR_EXPIRED:
5431                 nfs4_schedule_lease_recovery(server->nfs_client);
5432         };
5433 }
5434
5435 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5436 {
5437         struct nfs4_lockdata *data;
5438         struct rpc_task *task;
5439         struct rpc_message msg = {
5440                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5441                 .rpc_cred = state->owner->so_cred,
5442         };
5443         struct rpc_task_setup task_setup_data = {
5444                 .rpc_client = NFS_CLIENT(state->inode),
5445                 .rpc_message = &msg,
5446                 .callback_ops = &nfs4_lock_ops,
5447                 .workqueue = nfsiod_workqueue,
5448                 .flags = RPC_TASK_ASYNC,
5449         };
5450         int ret;
5451
5452         dprintk("%s: begin!\n", __func__);
5453         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5454                         fl->fl_u.nfs4_fl.owner,
5455                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5456         if (data == NULL)
5457                 return -ENOMEM;
5458         if (IS_SETLKW(cmd))
5459                 data->arg.block = 1;
5460         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5461         msg.rpc_argp = &data->arg;
5462         msg.rpc_resp = &data->res;
5463         task_setup_data.callback_data = data;
5464         if (recovery_type > NFS_LOCK_NEW) {
5465                 if (recovery_type == NFS_LOCK_RECLAIM)
5466                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5467                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5468         }
5469         task = rpc_run_task(&task_setup_data);
5470         if (IS_ERR(task))
5471                 return PTR_ERR(task);
5472         ret = nfs4_wait_for_completion_rpc_task(task);
5473         if (ret == 0) {
5474                 ret = data->rpc_status;
5475                 if (ret)
5476                         nfs4_handle_setlk_error(data->server, data->lsp,
5477                                         data->arg.new_lock_owner, ret);
5478         } else
5479                 data->cancelled = 1;
5480         rpc_put_task(task);
5481         dprintk("%s: done, ret = %d!\n", __func__, ret);
5482         return ret;
5483 }
5484
5485 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5486 {
5487         struct nfs_server *server = NFS_SERVER(state->inode);
5488         struct nfs4_exception exception = {
5489                 .inode = state->inode,
5490         };
5491         int err;
5492
5493         do {
5494                 /* Cache the lock if possible... */
5495                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5496                         return 0;
5497                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5498                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5499                 if (err != -NFS4ERR_DELAY)
5500                         break;
5501                 nfs4_handle_exception(server, err, &exception);
5502         } while (exception.retry);
5503         return err;
5504 }
5505
5506 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5507 {
5508         struct nfs_server *server = NFS_SERVER(state->inode);
5509         struct nfs4_exception exception = {
5510                 .inode = state->inode,
5511         };
5512         int err;
5513
5514         err = nfs4_set_lock_state(state, request);
5515         if (err != 0)
5516                 return err;
5517         do {
5518                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5519                         return 0;
5520                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5521                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5522                 switch (err) {
5523                 default:
5524                         goto out;
5525                 case -NFS4ERR_GRACE:
5526                 case -NFS4ERR_DELAY:
5527                         nfs4_handle_exception(server, err, &exception);
5528                         err = 0;
5529                 }
5530         } while (exception.retry);
5531 out:
5532         return err;
5533 }
5534
5535 #if defined(CONFIG_NFS_V4_1)
5536 /**
5537  * nfs41_check_expired_locks - possibly free a lock stateid
5538  *
5539  * @state: NFSv4 state for an inode
5540  *
5541  * Returns NFS_OK if recovery for this stateid is now finished.
5542  * Otherwise a negative NFS4ERR value is returned.
5543  */
5544 static int nfs41_check_expired_locks(struct nfs4_state *state)
5545 {
5546         int status, ret = -NFS4ERR_BAD_STATEID;
5547         struct nfs4_lock_state *lsp;
5548         struct nfs_server *server = NFS_SERVER(state->inode);
5549
5550         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5551                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5552                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5553
5554                         status = nfs41_test_stateid(server,
5555                                         &lsp->ls_stateid,
5556                                         cred);
5557                         trace_nfs4_test_lock_stateid(state, lsp, status);
5558                         if (status != NFS_OK) {
5559                                 /* Free the stateid unless the server
5560                                  * informs us the stateid is unrecognized. */
5561                                 if (status != -NFS4ERR_BAD_STATEID)
5562                                         nfs41_free_stateid(server,
5563                                                         &lsp->ls_stateid,
5564                                                         cred);
5565                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5566                                 ret = status;
5567                         }
5568                 }
5569         };
5570
5571         return ret;
5572 }
5573
5574 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5575 {
5576         int status = NFS_OK;
5577
5578         if (test_bit(LK_STATE_IN_USE, &state->flags))
5579                 status = nfs41_check_expired_locks(state);
5580         if (status != NFS_OK)
5581                 status = nfs4_lock_expired(state, request);
5582         return status;
5583 }
5584 #endif
5585
5586 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5587 {
5588         struct nfs4_state_owner *sp = state->owner;
5589         struct nfs_inode *nfsi = NFS_I(state->inode);
5590         unsigned char fl_flags = request->fl_flags;
5591         unsigned int seq;
5592         int status = -ENOLCK;
5593
5594         if ((fl_flags & FL_POSIX) &&
5595                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5596                 goto out;
5597         /* Is this a delegated open? */
5598         status = nfs4_set_lock_state(state, request);
5599         if (status != 0)
5600                 goto out;
5601         request->fl_flags |= FL_ACCESS;
5602         status = do_vfs_lock(request->fl_file, request);
5603         if (status < 0)
5604                 goto out;
5605         down_read(&nfsi->rwsem);
5606         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5607                 /* Yes: cache locks! */
5608                 /* ...but avoid races with delegation recall... */
5609                 request->fl_flags = fl_flags & ~FL_SLEEP;
5610                 status = do_vfs_lock(request->fl_file, request);
5611                 goto out_unlock;
5612         }
5613         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5614         up_read(&nfsi->rwsem);
5615         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5616         if (status != 0)
5617                 goto out;
5618         down_read(&nfsi->rwsem);
5619         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5620                 status = -NFS4ERR_DELAY;
5621                 goto out_unlock;
5622         }
5623         /* Note: we always want to sleep here! */
5624         request->fl_flags = fl_flags | FL_SLEEP;
5625         if (do_vfs_lock(request->fl_file, request) < 0)
5626                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5627                         "manager!\n", __func__);
5628 out_unlock:
5629         up_read(&nfsi->rwsem);
5630 out:
5631         request->fl_flags = fl_flags;
5632         return status;
5633 }
5634
5635 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5636 {
5637         struct nfs4_exception exception = {
5638                 .state = state,
5639                 .inode = state->inode,
5640         };
5641         int err;
5642
5643         do {
5644                 err = _nfs4_proc_setlk(state, cmd, request);
5645                 trace_nfs4_set_lock(request, state, cmd, err);
5646                 if (err == -NFS4ERR_DENIED)
5647                         err = -EAGAIN;
5648                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5649                                 err, &exception);
5650         } while (exception.retry);
5651         return err;
5652 }
5653
5654 static int
5655 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5656 {
5657         struct nfs_open_context *ctx;
5658         struct nfs4_state *state;
5659         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5660         int status;
5661
5662         /* verify open state */
5663         ctx = nfs_file_open_context(filp);
5664         state = ctx->state;
5665
5666         if (request->fl_start < 0 || request->fl_end < 0)
5667                 return -EINVAL;
5668
5669         if (IS_GETLK(cmd)) {
5670                 if (state != NULL)
5671                         return nfs4_proc_getlk(state, F_GETLK, request);
5672                 return 0;
5673         }
5674
5675         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5676                 return -EINVAL;
5677
5678         if (request->fl_type == F_UNLCK) {
5679                 if (state != NULL)
5680                         return nfs4_proc_unlck(state, cmd, request);
5681                 return 0;
5682         }
5683
5684         if (state == NULL)
5685                 return -ENOLCK;
5686         /*
5687          * Don't rely on the VFS having checked the file open mode,
5688          * since it won't do this for flock() locks.
5689          */
5690         switch (request->fl_type) {
5691         case F_RDLCK:
5692                 if (!(filp->f_mode & FMODE_READ))
5693                         return -EBADF;
5694                 break;
5695         case F_WRLCK:
5696                 if (!(filp->f_mode & FMODE_WRITE))
5697                         return -EBADF;
5698         }
5699
5700         do {
5701                 status = nfs4_proc_setlk(state, cmd, request);
5702                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5703                         break;
5704                 timeout = nfs4_set_lock_task_retry(timeout);
5705                 status = -ERESTARTSYS;
5706                 if (signalled())
5707                         break;
5708         } while(status < 0);
5709         return status;
5710 }
5711
5712 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5713 {
5714         struct nfs_server *server = NFS_SERVER(state->inode);
5715         int err;
5716
5717         err = nfs4_set_lock_state(state, fl);
5718         if (err != 0)
5719                 return err;
5720         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5721         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5722 }
5723
5724 struct nfs_release_lockowner_data {
5725         struct nfs4_lock_state *lsp;
5726         struct nfs_server *server;
5727         struct nfs_release_lockowner_args args;
5728         struct nfs4_sequence_args seq_args;
5729         struct nfs4_sequence_res seq_res;
5730 };
5731
5732 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5733 {
5734         struct nfs_release_lockowner_data *data = calldata;
5735         nfs40_setup_sequence(data->server,
5736                                 &data->seq_args, &data->seq_res, task);
5737 }
5738
5739 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5740 {
5741         struct nfs_release_lockowner_data *data = calldata;
5742         nfs40_sequence_done(task, &data->seq_res);
5743 }
5744
5745 static void nfs4_release_lockowner_release(void *calldata)
5746 {
5747         struct nfs_release_lockowner_data *data = calldata;
5748         nfs4_free_lock_state(data->server, data->lsp);
5749         kfree(calldata);
5750 }
5751
5752 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5753         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5754         .rpc_call_done = nfs4_release_lockowner_done,
5755         .rpc_release = nfs4_release_lockowner_release,
5756 };
5757
5758 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5759 {
5760         struct nfs_release_lockowner_data *data;
5761         struct rpc_message msg = {
5762                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5763         };
5764
5765         if (server->nfs_client->cl_mvops->minor_version != 0)
5766                 return -EINVAL;
5767
5768         data = kmalloc(sizeof(*data), GFP_NOFS);
5769         if (!data)
5770                 return -ENOMEM;
5771         nfs4_init_sequence(&data->seq_args, &data->seq_res, 0);
5772         data->lsp = lsp;
5773         data->server = server;
5774         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5775         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5776         data->args.lock_owner.s_dev = server->s_dev;
5777
5778         msg.rpc_argp = &data->args;
5779         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5780         return 0;
5781 }
5782
5783 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5784
5785 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5786                                    const void *buf, size_t buflen,
5787                                    int flags, int type)
5788 {
5789         if (strcmp(key, "") != 0)
5790                 return -EINVAL;
5791
5792         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5793 }
5794
5795 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5796                                    void *buf, size_t buflen, int type)
5797 {
5798         if (strcmp(key, "") != 0)
5799                 return -EINVAL;
5800
5801         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5802 }
5803
5804 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5805                                        size_t list_len, const char *name,
5806                                        size_t name_len, int type)
5807 {
5808         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5809
5810         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5811                 return 0;
5812
5813         if (list && len <= list_len)
5814                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5815         return len;
5816 }
5817
5818 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5819 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5820 {
5821         return server->caps & NFS_CAP_SECURITY_LABEL;
5822 }
5823
5824 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5825                                    const void *buf, size_t buflen,
5826                                    int flags, int type)
5827 {
5828         if (security_ismaclabel(key))
5829                 return nfs4_set_security_label(dentry, buf, buflen);
5830
5831         return -EOPNOTSUPP;
5832 }
5833
5834 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5835                                    void *buf, size_t buflen, int type)
5836 {
5837         if (security_ismaclabel(key))
5838                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5839         return -EOPNOTSUPP;
5840 }
5841
5842 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5843                                        size_t list_len, const char *name,
5844                                        size_t name_len, int type)
5845 {
5846         size_t len = 0;
5847
5848         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5849                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5850                 if (list && len <= list_len)
5851                         security_inode_listsecurity(dentry->d_inode, list, len);
5852         }
5853         return len;
5854 }
5855
5856 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5857         .prefix = XATTR_SECURITY_PREFIX,
5858         .list   = nfs4_xattr_list_nfs4_label,
5859         .get    = nfs4_xattr_get_nfs4_label,
5860         .set    = nfs4_xattr_set_nfs4_label,
5861 };
5862 #endif
5863
5864
5865 /*
5866  * nfs_fhget will use either the mounted_on_fileid or the fileid
5867  */
5868 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5869 {
5870         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5871                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5872               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5873               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5874                 return;
5875
5876         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5877                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5878         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5879         fattr->nlink = 2;
5880 }
5881
5882 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5883                                    const struct qstr *name,
5884                                    struct nfs4_fs_locations *fs_locations,
5885                                    struct page *page)
5886 {
5887         struct nfs_server *server = NFS_SERVER(dir);
5888         u32 bitmask[3] = {
5889                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5890         };
5891         struct nfs4_fs_locations_arg args = {
5892                 .dir_fh = NFS_FH(dir),
5893                 .name = name,
5894                 .page = page,
5895                 .bitmask = bitmask,
5896         };
5897         struct nfs4_fs_locations_res res = {
5898                 .fs_locations = fs_locations,
5899         };
5900         struct rpc_message msg = {
5901                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5902                 .rpc_argp = &args,
5903                 .rpc_resp = &res,
5904         };
5905         int status;
5906
5907         dprintk("%s: start\n", __func__);
5908
5909         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5910          * is not supported */
5911         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5912                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5913         else
5914                 bitmask[0] |= FATTR4_WORD0_FILEID;
5915
5916         nfs_fattr_init(&fs_locations->fattr);
5917         fs_locations->server = server;
5918         fs_locations->nlocations = 0;
5919         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5920         dprintk("%s: returned status = %d\n", __func__, status);
5921         return status;
5922 }
5923
5924 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5925                            const struct qstr *name,
5926                            struct nfs4_fs_locations *fs_locations,
5927                            struct page *page)
5928 {
5929         struct nfs4_exception exception = { };
5930         int err;
5931         do {
5932                 err = _nfs4_proc_fs_locations(client, dir, name,
5933                                 fs_locations, page);
5934                 trace_nfs4_get_fs_locations(dir, name, err);
5935                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5936                                 &exception);
5937         } while (exception.retry);
5938         return err;
5939 }
5940
5941 /**
5942  * If 'use_integrity' is true and the state managment nfs_client
5943  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
5944  * and the machine credential as per RFC3530bis and RFC5661 Security
5945  * Considerations sections. Otherwise, just use the user cred with the
5946  * filesystem's rpc_client.
5947  */
5948 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
5949 {
5950         int status;
5951         struct nfs4_secinfo_arg args = {
5952                 .dir_fh = NFS_FH(dir),
5953                 .name   = name,
5954         };
5955         struct nfs4_secinfo_res res = {
5956                 .flavors     = flavors,
5957         };
5958         struct rpc_message msg = {
5959                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5960                 .rpc_argp = &args,
5961                 .rpc_resp = &res,
5962         };
5963         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
5964
5965         if (use_integrity) {
5966                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
5967                 msg.rpc_cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
5968         }
5969
5970         dprintk("NFS call  secinfo %s\n", name->name);
5971         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
5972                                 &res.seq_res, 0);
5973         dprintk("NFS reply  secinfo: %d\n", status);
5974
5975         if (msg.rpc_cred)
5976                 put_rpccred(msg.rpc_cred);
5977
5978         return status;
5979 }
5980
5981 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5982                       struct nfs4_secinfo_flavors *flavors)
5983 {
5984         struct nfs4_exception exception = { };
5985         int err;
5986         do {
5987                 err = -NFS4ERR_WRONGSEC;
5988
5989                 /* try to use integrity protection with machine cred */
5990                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
5991                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
5992
5993                 /*
5994                  * if unable to use integrity protection, or SECINFO with
5995                  * integrity protection returns NFS4ERR_WRONGSEC (which is
5996                  * disallowed by spec, but exists in deployed servers) use
5997                  * the current filesystem's rpc_client and the user cred.
5998                  */
5999                 if (err == -NFS4ERR_WRONGSEC)
6000                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6001
6002                 trace_nfs4_secinfo(dir, name, err);
6003                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6004                                 &exception);
6005         } while (exception.retry);
6006         return err;
6007 }
6008
6009 #ifdef CONFIG_NFS_V4_1
6010 /*
6011  * Check the exchange flags returned by the server for invalid flags, having
6012  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6013  * DS flags set.
6014  */
6015 static int nfs4_check_cl_exchange_flags(u32 flags)
6016 {
6017         if (flags & ~EXCHGID4_FLAG_MASK_R)
6018                 goto out_inval;
6019         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6020             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6021                 goto out_inval;
6022         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6023                 goto out_inval;
6024         return NFS_OK;
6025 out_inval:
6026         return -NFS4ERR_INVAL;
6027 }
6028
6029 static bool
6030 nfs41_same_server_scope(struct nfs41_server_scope *a,
6031                         struct nfs41_server_scope *b)
6032 {
6033         if (a->server_scope_sz == b->server_scope_sz &&
6034             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6035                 return true;
6036
6037         return false;
6038 }
6039
6040 /*
6041  * nfs4_proc_bind_conn_to_session()
6042  *
6043  * The 4.1 client currently uses the same TCP connection for the
6044  * fore and backchannel.
6045  */
6046 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6047 {
6048         int status;
6049         struct nfs41_bind_conn_to_session_res res;
6050         struct rpc_message msg = {
6051                 .rpc_proc =
6052                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6053                 .rpc_argp = clp,
6054                 .rpc_resp = &res,
6055                 .rpc_cred = cred,
6056         };
6057
6058         dprintk("--> %s\n", __func__);
6059
6060         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6061         if (unlikely(res.session == NULL)) {
6062                 status = -ENOMEM;
6063                 goto out;
6064         }
6065
6066         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6067         trace_nfs4_bind_conn_to_session(clp, status);
6068         if (status == 0) {
6069                 if (memcmp(res.session->sess_id.data,
6070                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6071                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6072                         status = -EIO;
6073                         goto out_session;
6074                 }
6075                 if (res.dir != NFS4_CDFS4_BOTH) {
6076                         dprintk("NFS: %s: Unexpected direction from server\n",
6077                                 __func__);
6078                         status = -EIO;
6079                         goto out_session;
6080                 }
6081                 if (res.use_conn_in_rdma_mode) {
6082                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6083                                 __func__);
6084                         status = -EIO;
6085                         goto out_session;
6086                 }
6087         }
6088 out_session:
6089         kfree(res.session);
6090 out:
6091         dprintk("<-- %s status= %d\n", __func__, status);
6092         return status;
6093 }
6094
6095 /*
6096  * nfs4_proc_exchange_id()
6097  *
6098  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6099  *
6100  * Since the clientid has expired, all compounds using sessions
6101  * associated with the stale clientid will be returning
6102  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6103  * be in some phase of session reset.
6104  */
6105 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6106 {
6107         nfs4_verifier verifier;
6108         struct nfs41_exchange_id_args args = {
6109                 .verifier = &verifier,
6110                 .client = clp,
6111                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6112                         EXCHGID4_FLAG_BIND_PRINC_STATEID,
6113         };
6114         struct nfs41_exchange_id_res res = {
6115                 0
6116         };
6117         int status;
6118         struct rpc_message msg = {
6119                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6120                 .rpc_argp = &args,
6121                 .rpc_resp = &res,
6122                 .rpc_cred = cred,
6123         };
6124
6125         nfs4_init_boot_verifier(clp, &verifier);
6126         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6127                                                         sizeof(args.id));
6128         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6129                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6130                 args.id_len, args.id);
6131
6132         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6133                                         GFP_NOFS);
6134         if (unlikely(res.server_owner == NULL)) {
6135                 status = -ENOMEM;
6136                 goto out;
6137         }
6138
6139         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6140                                         GFP_NOFS);
6141         if (unlikely(res.server_scope == NULL)) {
6142                 status = -ENOMEM;
6143                 goto out_server_owner;
6144         }
6145
6146         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6147         if (unlikely(res.impl_id == NULL)) {
6148                 status = -ENOMEM;
6149                 goto out_server_scope;
6150         }
6151
6152         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6153         trace_nfs4_exchange_id(clp, status);
6154         if (status == 0)
6155                 status = nfs4_check_cl_exchange_flags(res.flags);
6156
6157         if (status == 0) {
6158                 clp->cl_clientid = res.clientid;
6159                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6160                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6161                         clp->cl_seqid = res.seqid;
6162
6163                 kfree(clp->cl_serverowner);
6164                 clp->cl_serverowner = res.server_owner;
6165                 res.server_owner = NULL;
6166
6167                 /* use the most recent implementation id */
6168                 kfree(clp->cl_implid);
6169                 clp->cl_implid = res.impl_id;
6170
6171                 if (clp->cl_serverscope != NULL &&
6172                     !nfs41_same_server_scope(clp->cl_serverscope,
6173                                              res.server_scope)) {
6174                         dprintk("%s: server_scope mismatch detected\n",
6175                                 __func__);
6176                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6177                         kfree(clp->cl_serverscope);
6178                         clp->cl_serverscope = NULL;
6179                 }
6180
6181                 if (clp->cl_serverscope == NULL) {
6182                         clp->cl_serverscope = res.server_scope;
6183                         goto out;
6184                 }
6185         } else
6186                 kfree(res.impl_id);
6187
6188 out_server_owner:
6189         kfree(res.server_owner);
6190 out_server_scope:
6191         kfree(res.server_scope);
6192 out:
6193         if (clp->cl_implid != NULL)
6194                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6195                         "domain: %s, name: %s, date: %llu,%u\n",
6196                         clp->cl_implid->domain, clp->cl_implid->name,
6197                         clp->cl_implid->date.seconds,
6198                         clp->cl_implid->date.nseconds);
6199         dprintk("NFS reply exchange_id: %d\n", status);
6200         return status;
6201 }
6202
6203 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6204                 struct rpc_cred *cred)
6205 {
6206         struct rpc_message msg = {
6207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6208                 .rpc_argp = clp,
6209                 .rpc_cred = cred,
6210         };
6211         int status;
6212
6213         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6214         trace_nfs4_destroy_clientid(clp, status);
6215         if (status)
6216                 dprintk("NFS: Got error %d from the server %s on "
6217                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6218         return status;
6219 }
6220
6221 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6222                 struct rpc_cred *cred)
6223 {
6224         unsigned int loop;
6225         int ret;
6226
6227         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6228                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6229                 switch (ret) {
6230                 case -NFS4ERR_DELAY:
6231                 case -NFS4ERR_CLIENTID_BUSY:
6232                         ssleep(1);
6233                         break;
6234                 default:
6235                         return ret;
6236                 }
6237         }
6238         return 0;
6239 }
6240
6241 int nfs4_destroy_clientid(struct nfs_client *clp)
6242 {
6243         struct rpc_cred *cred;
6244         int ret = 0;
6245
6246         if (clp->cl_mvops->minor_version < 1)
6247                 goto out;
6248         if (clp->cl_exchange_flags == 0)
6249                 goto out;
6250         if (clp->cl_preserve_clid)
6251                 goto out;
6252         cred = nfs4_get_clid_cred(clp);
6253         ret = nfs4_proc_destroy_clientid(clp, cred);
6254         if (cred)
6255                 put_rpccred(cred);
6256         switch (ret) {
6257         case 0:
6258         case -NFS4ERR_STALE_CLIENTID:
6259                 clp->cl_exchange_flags = 0;
6260         }
6261 out:
6262         return ret;
6263 }
6264
6265 struct nfs4_get_lease_time_data {
6266         struct nfs4_get_lease_time_args *args;
6267         struct nfs4_get_lease_time_res *res;
6268         struct nfs_client *clp;
6269 };
6270
6271 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6272                                         void *calldata)
6273 {
6274         struct nfs4_get_lease_time_data *data =
6275                         (struct nfs4_get_lease_time_data *)calldata;
6276
6277         dprintk("--> %s\n", __func__);
6278         /* just setup sequence, do not trigger session recovery
6279            since we're invoked within one */
6280         nfs41_setup_sequence(data->clp->cl_session,
6281                         &data->args->la_seq_args,
6282                         &data->res->lr_seq_res,
6283                         task);
6284         dprintk("<-- %s\n", __func__);
6285 }
6286
6287 /*
6288  * Called from nfs4_state_manager thread for session setup, so don't recover
6289  * from sequence operation or clientid errors.
6290  */
6291 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6292 {
6293         struct nfs4_get_lease_time_data *data =
6294                         (struct nfs4_get_lease_time_data *)calldata;
6295
6296         dprintk("--> %s\n", __func__);
6297         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6298                 return;
6299         switch (task->tk_status) {
6300         case -NFS4ERR_DELAY:
6301         case -NFS4ERR_GRACE:
6302                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6303                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6304                 task->tk_status = 0;
6305                 /* fall through */
6306         case -NFS4ERR_RETRY_UNCACHED_REP:
6307                 rpc_restart_call_prepare(task);
6308                 return;
6309         }
6310         dprintk("<-- %s\n", __func__);
6311 }
6312
6313 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6314         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6315         .rpc_call_done = nfs4_get_lease_time_done,
6316 };
6317
6318 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6319 {
6320         struct rpc_task *task;
6321         struct nfs4_get_lease_time_args args;
6322         struct nfs4_get_lease_time_res res = {
6323                 .lr_fsinfo = fsinfo,
6324         };
6325         struct nfs4_get_lease_time_data data = {
6326                 .args = &args,
6327                 .res = &res,
6328                 .clp = clp,
6329         };
6330         struct rpc_message msg = {
6331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6332                 .rpc_argp = &args,
6333                 .rpc_resp = &res,
6334         };
6335         struct rpc_task_setup task_setup = {
6336                 .rpc_client = clp->cl_rpcclient,
6337                 .rpc_message = &msg,
6338                 .callback_ops = &nfs4_get_lease_time_ops,
6339                 .callback_data = &data,
6340                 .flags = RPC_TASK_TIMEOUT,
6341         };
6342         int status;
6343
6344         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6345         nfs4_set_sequence_privileged(&args.la_seq_args);
6346         dprintk("--> %s\n", __func__);
6347         task = rpc_run_task(&task_setup);
6348
6349         if (IS_ERR(task))
6350                 status = PTR_ERR(task);
6351         else {
6352                 status = task->tk_status;
6353                 rpc_put_task(task);
6354         }
6355         dprintk("<-- %s return %d\n", __func__, status);
6356
6357         return status;
6358 }
6359
6360 /*
6361  * Initialize the values to be used by the client in CREATE_SESSION
6362  * If nfs4_init_session set the fore channel request and response sizes,
6363  * use them.
6364  *
6365  * Set the back channel max_resp_sz_cached to zero to force the client to
6366  * always set csa_cachethis to FALSE because the current implementation
6367  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6368  */
6369 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6370 {
6371         unsigned int max_rqst_sz, max_resp_sz;
6372
6373         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6374         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6375
6376         /* Fore channel attributes */
6377         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6378         args->fc_attrs.max_resp_sz = max_resp_sz;
6379         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6380         args->fc_attrs.max_reqs = max_session_slots;
6381
6382         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6383                 "max_ops=%u max_reqs=%u\n",
6384                 __func__,
6385                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6386                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6387
6388         /* Back channel attributes */
6389         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6390         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6391         args->bc_attrs.max_resp_sz_cached = 0;
6392         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6393         args->bc_attrs.max_reqs = 1;
6394
6395         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6396                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6397                 __func__,
6398                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6399                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6400                 args->bc_attrs.max_reqs);
6401 }
6402
6403 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6404 {
6405         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6406         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6407
6408         if (rcvd->max_resp_sz > sent->max_resp_sz)
6409                 return -EINVAL;
6410         /*
6411          * Our requested max_ops is the minimum we need; we're not
6412          * prepared to break up compounds into smaller pieces than that.
6413          * So, no point even trying to continue if the server won't
6414          * cooperate:
6415          */
6416         if (rcvd->max_ops < sent->max_ops)
6417                 return -EINVAL;
6418         if (rcvd->max_reqs == 0)
6419                 return -EINVAL;
6420         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6421                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6422         return 0;
6423 }
6424
6425 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6426 {
6427         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6428         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6429
6430         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6431                 return -EINVAL;
6432         if (rcvd->max_resp_sz < sent->max_resp_sz)
6433                 return -EINVAL;
6434         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6435                 return -EINVAL;
6436         /* These would render the backchannel useless: */
6437         if (rcvd->max_ops != sent->max_ops)
6438                 return -EINVAL;
6439         if (rcvd->max_reqs != sent->max_reqs)
6440                 return -EINVAL;
6441         return 0;
6442 }
6443
6444 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6445                                      struct nfs4_session *session)
6446 {
6447         int ret;
6448
6449         ret = nfs4_verify_fore_channel_attrs(args, session);
6450         if (ret)
6451                 return ret;
6452         return nfs4_verify_back_channel_attrs(args, session);
6453 }
6454
6455 static int _nfs4_proc_create_session(struct nfs_client *clp,
6456                 struct rpc_cred *cred)
6457 {
6458         struct nfs4_session *session = clp->cl_session;
6459         struct nfs41_create_session_args args = {
6460                 .client = clp,
6461                 .cb_program = NFS4_CALLBACK,
6462         };
6463         struct nfs41_create_session_res res = {
6464                 .client = clp,
6465         };
6466         struct rpc_message msg = {
6467                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6468                 .rpc_argp = &args,
6469                 .rpc_resp = &res,
6470                 .rpc_cred = cred,
6471         };
6472         int status;
6473
6474         nfs4_init_channel_attrs(&args);
6475         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6476
6477         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6478         trace_nfs4_create_session(clp, status);
6479
6480         if (!status) {
6481                 /* Verify the session's negotiated channel_attrs values */
6482                 status = nfs4_verify_channel_attrs(&args, session);
6483                 /* Increment the clientid slot sequence id */
6484                 clp->cl_seqid++;
6485         }
6486
6487         return status;
6488 }
6489
6490 /*
6491  * Issues a CREATE_SESSION operation to the server.
6492  * It is the responsibility of the caller to verify the session is
6493  * expired before calling this routine.
6494  */
6495 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6496 {
6497         int status;
6498         unsigned *ptr;
6499         struct nfs4_session *session = clp->cl_session;
6500
6501         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6502
6503         status = _nfs4_proc_create_session(clp, cred);
6504         if (status)
6505                 goto out;
6506
6507         /* Init or reset the session slot tables */
6508         status = nfs4_setup_session_slot_tables(session);
6509         dprintk("slot table setup returned %d\n", status);
6510         if (status)
6511                 goto out;
6512
6513         ptr = (unsigned *)&session->sess_id.data[0];
6514         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6515                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6516 out:
6517         dprintk("<-- %s\n", __func__);
6518         return status;
6519 }
6520
6521 /*
6522  * Issue the over-the-wire RPC DESTROY_SESSION.
6523  * The caller must serialize access to this routine.
6524  */
6525 int nfs4_proc_destroy_session(struct nfs4_session *session,
6526                 struct rpc_cred *cred)
6527 {
6528         struct rpc_message msg = {
6529                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6530                 .rpc_argp = session,
6531                 .rpc_cred = cred,
6532         };
6533         int status = 0;
6534
6535         dprintk("--> nfs4_proc_destroy_session\n");
6536
6537         /* session is still being setup */
6538         if (session->clp->cl_cons_state != NFS_CS_READY)
6539                 return status;
6540
6541         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6542         trace_nfs4_destroy_session(session->clp, status);
6543
6544         if (status)
6545                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6546                         "Session has been destroyed regardless...\n", status);
6547
6548         dprintk("<-- nfs4_proc_destroy_session\n");
6549         return status;
6550 }
6551
6552 /*
6553  * Renew the cl_session lease.
6554  */
6555 struct nfs4_sequence_data {
6556         struct nfs_client *clp;
6557         struct nfs4_sequence_args args;
6558         struct nfs4_sequence_res res;
6559 };
6560
6561 static void nfs41_sequence_release(void *data)
6562 {
6563         struct nfs4_sequence_data *calldata = data;
6564         struct nfs_client *clp = calldata->clp;
6565
6566         if (atomic_read(&clp->cl_count) > 1)
6567                 nfs4_schedule_state_renewal(clp);
6568         nfs_put_client(clp);
6569         kfree(calldata);
6570 }
6571
6572 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6573 {
6574         switch(task->tk_status) {
6575         case -NFS4ERR_DELAY:
6576                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6577                 return -EAGAIN;
6578         default:
6579                 nfs4_schedule_lease_recovery(clp);
6580         }
6581         return 0;
6582 }
6583
6584 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6585 {
6586         struct nfs4_sequence_data *calldata = data;
6587         struct nfs_client *clp = calldata->clp;
6588
6589         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6590                 return;
6591
6592         trace_nfs4_sequence(clp, task->tk_status);
6593         if (task->tk_status < 0) {
6594                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6595                 if (atomic_read(&clp->cl_count) == 1)
6596                         goto out;
6597
6598                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6599                         rpc_restart_call_prepare(task);
6600                         return;
6601                 }
6602         }
6603         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6604 out:
6605         dprintk("<-- %s\n", __func__);
6606 }
6607
6608 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6609 {
6610         struct nfs4_sequence_data *calldata = data;
6611         struct nfs_client *clp = calldata->clp;
6612         struct nfs4_sequence_args *args;
6613         struct nfs4_sequence_res *res;
6614
6615         args = task->tk_msg.rpc_argp;
6616         res = task->tk_msg.rpc_resp;
6617
6618         nfs41_setup_sequence(clp->cl_session, args, res, task);
6619 }
6620
6621 static const struct rpc_call_ops nfs41_sequence_ops = {
6622         .rpc_call_done = nfs41_sequence_call_done,
6623         .rpc_call_prepare = nfs41_sequence_prepare,
6624         .rpc_release = nfs41_sequence_release,
6625 };
6626
6627 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6628                 struct rpc_cred *cred,
6629                 bool is_privileged)
6630 {
6631         struct nfs4_sequence_data *calldata;
6632         struct rpc_message msg = {
6633                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6634                 .rpc_cred = cred,
6635         };
6636         struct rpc_task_setup task_setup_data = {
6637                 .rpc_client = clp->cl_rpcclient,
6638                 .rpc_message = &msg,
6639                 .callback_ops = &nfs41_sequence_ops,
6640                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6641         };
6642
6643         if (!atomic_inc_not_zero(&clp->cl_count))
6644                 return ERR_PTR(-EIO);
6645         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6646         if (calldata == NULL) {
6647                 nfs_put_client(clp);
6648                 return ERR_PTR(-ENOMEM);
6649         }
6650         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
6651         if (is_privileged)
6652                 nfs4_set_sequence_privileged(&calldata->args);
6653         msg.rpc_argp = &calldata->args;
6654         msg.rpc_resp = &calldata->res;
6655         calldata->clp = clp;
6656         task_setup_data.callback_data = calldata;
6657
6658         return rpc_run_task(&task_setup_data);
6659 }
6660
6661 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6662 {
6663         struct rpc_task *task;
6664         int ret = 0;
6665
6666         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6667                 return 0;
6668         task = _nfs41_proc_sequence(clp, cred, false);
6669         if (IS_ERR(task))
6670                 ret = PTR_ERR(task);
6671         else
6672                 rpc_put_task_async(task);
6673         dprintk("<-- %s status=%d\n", __func__, ret);
6674         return ret;
6675 }
6676
6677 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6678 {
6679         struct rpc_task *task;
6680         int ret;
6681
6682         task = _nfs41_proc_sequence(clp, cred, true);
6683         if (IS_ERR(task)) {
6684                 ret = PTR_ERR(task);
6685                 goto out;
6686         }
6687         ret = rpc_wait_for_completion_task(task);
6688         if (!ret) {
6689                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6690
6691                 if (task->tk_status == 0)
6692                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6693                 ret = task->tk_status;
6694         }
6695         rpc_put_task(task);
6696 out:
6697         dprintk("<-- %s status=%d\n", __func__, ret);
6698         return ret;
6699 }
6700
6701 struct nfs4_reclaim_complete_data {
6702         struct nfs_client *clp;
6703         struct nfs41_reclaim_complete_args arg;
6704         struct nfs41_reclaim_complete_res res;
6705 };
6706
6707 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6708 {
6709         struct nfs4_reclaim_complete_data *calldata = data;
6710
6711         nfs41_setup_sequence(calldata->clp->cl_session,
6712                         &calldata->arg.seq_args,
6713                         &calldata->res.seq_res,
6714                         task);
6715 }
6716
6717 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6718 {
6719         switch(task->tk_status) {
6720         case 0:
6721         case -NFS4ERR_COMPLETE_ALREADY:
6722         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6723                 break;
6724         case -NFS4ERR_DELAY:
6725                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6726                 /* fall through */
6727         case -NFS4ERR_RETRY_UNCACHED_REP:
6728                 return -EAGAIN;
6729         default:
6730                 nfs4_schedule_lease_recovery(clp);
6731         }
6732         return 0;
6733 }
6734
6735 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6736 {
6737         struct nfs4_reclaim_complete_data *calldata = data;
6738         struct nfs_client *clp = calldata->clp;
6739         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6740
6741         dprintk("--> %s\n", __func__);
6742         if (!nfs41_sequence_done(task, res))
6743                 return;
6744
6745         trace_nfs4_reclaim_complete(clp, task->tk_status);
6746         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6747                 rpc_restart_call_prepare(task);
6748                 return;
6749         }
6750         dprintk("<-- %s\n", __func__);
6751 }
6752
6753 static void nfs4_free_reclaim_complete_data(void *data)
6754 {
6755         struct nfs4_reclaim_complete_data *calldata = data;
6756
6757         kfree(calldata);
6758 }
6759
6760 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6761         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6762         .rpc_call_done = nfs4_reclaim_complete_done,
6763         .rpc_release = nfs4_free_reclaim_complete_data,
6764 };
6765
6766 /*
6767  * Issue a global reclaim complete.
6768  */
6769 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
6770                 struct rpc_cred *cred)
6771 {
6772         struct nfs4_reclaim_complete_data *calldata;
6773         struct rpc_task *task;
6774         struct rpc_message msg = {
6775                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6776                 .rpc_cred = cred,
6777         };
6778         struct rpc_task_setup task_setup_data = {
6779                 .rpc_client = clp->cl_rpcclient,
6780                 .rpc_message = &msg,
6781                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6782                 .flags = RPC_TASK_ASYNC,
6783         };
6784         int status = -ENOMEM;
6785
6786         dprintk("--> %s\n", __func__);
6787         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6788         if (calldata == NULL)
6789                 goto out;
6790         calldata->clp = clp;
6791         calldata->arg.one_fs = 0;
6792
6793         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6794         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6795         msg.rpc_argp = &calldata->arg;
6796         msg.rpc_resp = &calldata->res;
6797         task_setup_data.callback_data = calldata;
6798         task = rpc_run_task(&task_setup_data);
6799         if (IS_ERR(task)) {
6800                 status = PTR_ERR(task);
6801                 goto out;
6802         }
6803         status = nfs4_wait_for_completion_rpc_task(task);
6804         if (status == 0)
6805                 status = task->tk_status;
6806         rpc_put_task(task);
6807         return 0;
6808 out:
6809         dprintk("<-- %s status=%d\n", __func__, status);
6810         return status;
6811 }
6812
6813 static void
6814 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6815 {
6816         struct nfs4_layoutget *lgp = calldata;
6817         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6818         struct nfs4_session *session = nfs4_get_session(server);
6819
6820         dprintk("--> %s\n", __func__);
6821         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6822          * right now covering the LAYOUTGET we are about to send.
6823          * However, that is not so catastrophic, and there seems
6824          * to be no way to prevent it completely.
6825          */
6826         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6827                                 &lgp->res.seq_res, task))
6828                 return;
6829         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6830                                           NFS_I(lgp->args.inode)->layout,
6831                                           lgp->args.ctx->state)) {
6832                 rpc_exit(task, NFS4_OK);
6833         }
6834 }
6835
6836 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6837 {
6838         struct nfs4_layoutget *lgp = calldata;
6839         struct inode *inode = lgp->args.inode;
6840         struct nfs_server *server = NFS_SERVER(inode);
6841         struct pnfs_layout_hdr *lo;
6842         struct nfs4_state *state = NULL;
6843         unsigned long timeo, giveup;
6844
6845         dprintk("--> %s\n", __func__);
6846
6847         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6848                 goto out;
6849
6850         switch (task->tk_status) {
6851         case 0:
6852                 goto out;
6853         case -NFS4ERR_LAYOUTTRYLATER:
6854         case -NFS4ERR_RECALLCONFLICT:
6855                 timeo = rpc_get_timeout(task->tk_client);
6856                 giveup = lgp->args.timestamp + timeo;
6857                 if (time_after(giveup, jiffies))
6858                         task->tk_status = -NFS4ERR_DELAY;
6859                 break;
6860         case -NFS4ERR_EXPIRED:
6861         case -NFS4ERR_BAD_STATEID:
6862                 spin_lock(&inode->i_lock);
6863                 lo = NFS_I(inode)->layout;
6864                 if (!lo || list_empty(&lo->plh_segs)) {
6865                         spin_unlock(&inode->i_lock);
6866                         /* If the open stateid was bad, then recover it. */
6867                         state = lgp->args.ctx->state;
6868                 } else {
6869                         LIST_HEAD(head);
6870
6871                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6872                         spin_unlock(&inode->i_lock);
6873                         /* Mark the bad layout state as invalid, then
6874                          * retry using the open stateid. */
6875                         pnfs_free_lseg_list(&head);
6876                 }
6877         }
6878         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6879                 rpc_restart_call_prepare(task);
6880 out:
6881         dprintk("<-- %s\n", __func__);
6882 }
6883
6884 static size_t max_response_pages(struct nfs_server *server)
6885 {
6886         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6887         return nfs_page_array_len(0, max_resp_sz);
6888 }
6889
6890 static void nfs4_free_pages(struct page **pages, size_t size)
6891 {
6892         int i;
6893
6894         if (!pages)
6895                 return;
6896
6897         for (i = 0; i < size; i++) {
6898                 if (!pages[i])
6899                         break;
6900                 __free_page(pages[i]);
6901         }
6902         kfree(pages);
6903 }
6904
6905 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6906 {
6907         struct page **pages;
6908         int i;
6909
6910         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6911         if (!pages) {
6912                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6913                 return NULL;
6914         }
6915
6916         for (i = 0; i < size; i++) {
6917                 pages[i] = alloc_page(gfp_flags);
6918                 if (!pages[i]) {
6919                         dprintk("%s: failed to allocate page\n", __func__);
6920                         nfs4_free_pages(pages, size);
6921                         return NULL;
6922                 }
6923         }
6924
6925         return pages;
6926 }
6927
6928 static void nfs4_layoutget_release(void *calldata)
6929 {
6930         struct nfs4_layoutget *lgp = calldata;
6931         struct inode *inode = lgp->args.inode;
6932         struct nfs_server *server = NFS_SERVER(inode);
6933         size_t max_pages = max_response_pages(server);
6934
6935         dprintk("--> %s\n", __func__);
6936         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6937         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6938         put_nfs_open_context(lgp->args.ctx);
6939         kfree(calldata);
6940         dprintk("<-- %s\n", __func__);
6941 }
6942
6943 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6944         .rpc_call_prepare = nfs4_layoutget_prepare,
6945         .rpc_call_done = nfs4_layoutget_done,
6946         .rpc_release = nfs4_layoutget_release,
6947 };
6948
6949 struct pnfs_layout_segment *
6950 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6951 {
6952         struct inode *inode = lgp->args.inode;
6953         struct nfs_server *server = NFS_SERVER(inode);
6954         size_t max_pages = max_response_pages(server);
6955         struct rpc_task *task;
6956         struct rpc_message msg = {
6957                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6958                 .rpc_argp = &lgp->args,
6959                 .rpc_resp = &lgp->res,
6960                 .rpc_cred = lgp->cred,
6961         };
6962         struct rpc_task_setup task_setup_data = {
6963                 .rpc_client = server->client,
6964                 .rpc_message = &msg,
6965                 .callback_ops = &nfs4_layoutget_call_ops,
6966                 .callback_data = lgp,
6967                 .flags = RPC_TASK_ASYNC,
6968         };
6969         struct pnfs_layout_segment *lseg = NULL;
6970         int status = 0;
6971
6972         dprintk("--> %s\n", __func__);
6973
6974         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6975         if (!lgp->args.layout.pages) {
6976                 nfs4_layoutget_release(lgp);
6977                 return ERR_PTR(-ENOMEM);
6978         }
6979         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6980         lgp->args.timestamp = jiffies;
6981
6982         lgp->res.layoutp = &lgp->args.layout;
6983         lgp->res.seq_res.sr_slot = NULL;
6984         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6985
6986         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6987         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6988
6989         task = rpc_run_task(&task_setup_data);
6990         if (IS_ERR(task))
6991                 return ERR_CAST(task);
6992         status = nfs4_wait_for_completion_rpc_task(task);
6993         if (status == 0)
6994                 status = task->tk_status;
6995         trace_nfs4_layoutget(lgp->args.ctx,
6996                         &lgp->args.range,
6997                         &lgp->res.range,
6998                         status);
6999         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7000         if (status == 0 && lgp->res.layoutp->len)
7001                 lseg = pnfs_layout_process(lgp);
7002         rpc_put_task(task);
7003         dprintk("<-- %s status=%d\n", __func__, status);
7004         if (status)
7005                 return ERR_PTR(status);
7006         return lseg;
7007 }
7008
7009 static void
7010 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7011 {
7012         struct nfs4_layoutreturn *lrp = calldata;
7013
7014         dprintk("--> %s\n", __func__);
7015         nfs41_setup_sequence(lrp->clp->cl_session,
7016                         &lrp->args.seq_args,
7017                         &lrp->res.seq_res,
7018                         task);
7019 }
7020
7021 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7022 {
7023         struct nfs4_layoutreturn *lrp = calldata;
7024         struct nfs_server *server;
7025
7026         dprintk("--> %s\n", __func__);
7027
7028         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7029                 return;
7030
7031         server = NFS_SERVER(lrp->args.inode);
7032         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7033                 rpc_restart_call_prepare(task);
7034                 return;
7035         }
7036         dprintk("<-- %s\n", __func__);
7037 }
7038
7039 static void nfs4_layoutreturn_release(void *calldata)
7040 {
7041         struct nfs4_layoutreturn *lrp = calldata;
7042         struct pnfs_layout_hdr *lo = lrp->args.layout;
7043
7044         dprintk("--> %s\n", __func__);
7045         spin_lock(&lo->plh_inode->i_lock);
7046         if (lrp->res.lrs_present)
7047                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7048         lo->plh_block_lgets--;
7049         spin_unlock(&lo->plh_inode->i_lock);
7050         pnfs_put_layout_hdr(lrp->args.layout);
7051         kfree(calldata);
7052         dprintk("<-- %s\n", __func__);
7053 }
7054
7055 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7056         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7057         .rpc_call_done = nfs4_layoutreturn_done,
7058         .rpc_release = nfs4_layoutreturn_release,
7059 };
7060
7061 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7062 {
7063         struct rpc_task *task;
7064         struct rpc_message msg = {
7065                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7066                 .rpc_argp = &lrp->args,
7067                 .rpc_resp = &lrp->res,
7068                 .rpc_cred = lrp->cred,
7069         };
7070         struct rpc_task_setup task_setup_data = {
7071                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7072                 .rpc_message = &msg,
7073                 .callback_ops = &nfs4_layoutreturn_call_ops,
7074                 .callback_data = lrp,
7075         };
7076         int status;
7077
7078         dprintk("--> %s\n", __func__);
7079         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7080         task = rpc_run_task(&task_setup_data);
7081         if (IS_ERR(task))
7082                 return PTR_ERR(task);
7083         status = task->tk_status;
7084         trace_nfs4_layoutreturn(lrp->args.inode, status);
7085         dprintk("<-- %s status=%d\n", __func__, status);
7086         rpc_put_task(task);
7087         return status;
7088 }
7089
7090 /*
7091  * Retrieve the list of Data Server devices from the MDS.
7092  */
7093 static int _nfs4_getdevicelist(struct nfs_server *server,
7094                                     const struct nfs_fh *fh,
7095                                     struct pnfs_devicelist *devlist)
7096 {
7097         struct nfs4_getdevicelist_args args = {
7098                 .fh = fh,
7099                 .layoutclass = server->pnfs_curr_ld->id,
7100         };
7101         struct nfs4_getdevicelist_res res = {
7102                 .devlist = devlist,
7103         };
7104         struct rpc_message msg = {
7105                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7106                 .rpc_argp = &args,
7107                 .rpc_resp = &res,
7108         };
7109         int status;
7110
7111         dprintk("--> %s\n", __func__);
7112         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7113                                 &res.seq_res, 0);
7114         dprintk("<-- %s status=%d\n", __func__, status);
7115         return status;
7116 }
7117
7118 int nfs4_proc_getdevicelist(struct nfs_server *server,
7119                             const struct nfs_fh *fh,
7120                             struct pnfs_devicelist *devlist)
7121 {
7122         struct nfs4_exception exception = { };
7123         int err;
7124
7125         do {
7126                 err = nfs4_handle_exception(server,
7127                                 _nfs4_getdevicelist(server, fh, devlist),
7128                                 &exception);
7129         } while (exception.retry);
7130
7131         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7132                 err, devlist->num_devs);
7133
7134         return err;
7135 }
7136 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7137
7138 static int
7139 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7140                 struct pnfs_device *pdev,
7141                 struct rpc_cred *cred)
7142 {
7143         struct nfs4_getdeviceinfo_args args = {
7144                 .pdev = pdev,
7145         };
7146         struct nfs4_getdeviceinfo_res res = {
7147                 .pdev = pdev,
7148         };
7149         struct rpc_message msg = {
7150                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7151                 .rpc_argp = &args,
7152                 .rpc_resp = &res,
7153                 .rpc_cred = cred,
7154         };
7155         int status;
7156
7157         dprintk("--> %s\n", __func__);
7158         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7159         dprintk("<-- %s status=%d\n", __func__, status);
7160
7161         return status;
7162 }
7163
7164 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7165                 struct pnfs_device *pdev,
7166                 struct rpc_cred *cred)
7167 {
7168         struct nfs4_exception exception = { };
7169         int err;
7170
7171         do {
7172                 err = nfs4_handle_exception(server,
7173                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7174                                         &exception);
7175         } while (exception.retry);
7176         return err;
7177 }
7178 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7179
7180 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7181 {
7182         struct nfs4_layoutcommit_data *data = calldata;
7183         struct nfs_server *server = NFS_SERVER(data->args.inode);
7184         struct nfs4_session *session = nfs4_get_session(server);
7185
7186         nfs41_setup_sequence(session,
7187                         &data->args.seq_args,
7188                         &data->res.seq_res,
7189                         task);
7190 }
7191
7192 static void
7193 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7194 {
7195         struct nfs4_layoutcommit_data *data = calldata;
7196         struct nfs_server *server = NFS_SERVER(data->args.inode);
7197
7198         if (!nfs41_sequence_done(task, &data->res.seq_res))
7199                 return;
7200
7201         switch (task->tk_status) { /* Just ignore these failures */
7202         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7203         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7204         case -NFS4ERR_BADLAYOUT:     /* no layout */
7205         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7206                 task->tk_status = 0;
7207                 break;
7208         case 0:
7209                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7210                                                    data->res.fattr);
7211                 break;
7212         default:
7213                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7214                         rpc_restart_call_prepare(task);
7215                         return;
7216                 }
7217         }
7218 }
7219
7220 static void nfs4_layoutcommit_release(void *calldata)
7221 {
7222         struct nfs4_layoutcommit_data *data = calldata;
7223
7224         pnfs_cleanup_layoutcommit(data);
7225         put_rpccred(data->cred);
7226         kfree(data);
7227 }
7228
7229 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7230         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7231         .rpc_call_done = nfs4_layoutcommit_done,
7232         .rpc_release = nfs4_layoutcommit_release,
7233 };
7234
7235 int
7236 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7237 {
7238         struct rpc_message msg = {
7239                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7240                 .rpc_argp = &data->args,
7241                 .rpc_resp = &data->res,
7242                 .rpc_cred = data->cred,
7243         };
7244         struct rpc_task_setup task_setup_data = {
7245                 .task = &data->task,
7246                 .rpc_client = NFS_CLIENT(data->args.inode),
7247                 .rpc_message = &msg,
7248                 .callback_ops = &nfs4_layoutcommit_ops,
7249                 .callback_data = data,
7250                 .flags = RPC_TASK_ASYNC,
7251         };
7252         struct rpc_task *task;
7253         int status = 0;
7254
7255         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7256                 "lbw: %llu inode %lu\n",
7257                 data->task.tk_pid, sync,
7258                 data->args.lastbytewritten,
7259                 data->args.inode->i_ino);
7260
7261         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7262         task = rpc_run_task(&task_setup_data);
7263         if (IS_ERR(task))
7264                 return PTR_ERR(task);
7265         if (sync == false)
7266                 goto out;
7267         status = nfs4_wait_for_completion_rpc_task(task);
7268         if (status != 0)
7269                 goto out;
7270         status = task->tk_status;
7271         trace_nfs4_layoutcommit(data->args.inode, status);
7272 out:
7273         dprintk("%s: status %d\n", __func__, status);
7274         rpc_put_task(task);
7275         return status;
7276 }
7277
7278 /**
7279  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7280  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7281  */
7282 static int
7283 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7284                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7285 {
7286         struct nfs41_secinfo_no_name_args args = {
7287                 .style = SECINFO_STYLE_CURRENT_FH,
7288         };
7289         struct nfs4_secinfo_res res = {
7290                 .flavors = flavors,
7291         };
7292         struct rpc_message msg = {
7293                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7294                 .rpc_argp = &args,
7295                 .rpc_resp = &res,
7296         };
7297         return nfs4_call_sync(server->nfs_client->cl_rpcclient, server, &msg,
7298                                 &args.seq_args, &res.seq_res, 0);
7299 }
7300
7301 static int
7302 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7303                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7304 {
7305         struct nfs4_exception exception = { };
7306         int err;
7307         do {
7308                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7309                 switch (err) {
7310                 case 0:
7311                 case -NFS4ERR_WRONGSEC:
7312                 case -NFS4ERR_NOTSUPP:
7313                         goto out;
7314                 default:
7315                         err = nfs4_handle_exception(server, err, &exception);
7316                 }
7317         } while (exception.retry);
7318 out:
7319         return err;
7320 }
7321
7322 static int
7323 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7324                     struct nfs_fsinfo *info)
7325 {
7326         int err;
7327         struct page *page;
7328         rpc_authflavor_t flavor;
7329         struct nfs4_secinfo_flavors *flavors;
7330
7331         page = alloc_page(GFP_KERNEL);
7332         if (!page) {
7333                 err = -ENOMEM;
7334                 goto out;
7335         }
7336
7337         flavors = page_address(page);
7338         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7339
7340         /*
7341          * Fall back on "guess and check" method if
7342          * the server doesn't support SECINFO_NO_NAME
7343          */
7344         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7345                 err = nfs4_find_root_sec(server, fhandle, info);
7346                 goto out_freepage;
7347         }
7348         if (err)
7349                 goto out_freepage;
7350
7351         flavor = nfs_find_best_sec(flavors);
7352         if (err == 0)
7353                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
7354
7355 out_freepage:
7356         put_page(page);
7357         if (err == -EACCES)
7358                 return -EPERM;
7359 out:
7360         return err;
7361 }
7362
7363 static int _nfs41_test_stateid(struct nfs_server *server,
7364                 nfs4_stateid *stateid,
7365                 struct rpc_cred *cred)
7366 {
7367         int status;
7368         struct nfs41_test_stateid_args args = {
7369                 .stateid = stateid,
7370         };
7371         struct nfs41_test_stateid_res res;
7372         struct rpc_message msg = {
7373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7374                 .rpc_argp = &args,
7375                 .rpc_resp = &res,
7376                 .rpc_cred = cred,
7377         };
7378
7379         dprintk("NFS call  test_stateid %p\n", stateid);
7380         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
7381         nfs4_set_sequence_privileged(&args.seq_args);
7382         status = nfs4_call_sync_sequence(server->client, server, &msg,
7383                         &args.seq_args, &res.seq_res);
7384         if (status != NFS_OK) {
7385                 dprintk("NFS reply test_stateid: failed, %d\n", status);
7386                 return status;
7387         }
7388         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7389         return -res.status;
7390 }
7391
7392 /**
7393  * nfs41_test_stateid - perform a TEST_STATEID operation
7394  *
7395  * @server: server / transport on which to perform the operation
7396  * @stateid: state ID to test
7397  * @cred: credential
7398  *
7399  * Returns NFS_OK if the server recognizes that "stateid" is valid.
7400  * Otherwise a negative NFS4ERR value is returned if the operation
7401  * failed or the state ID is not currently valid.
7402  */
7403 static int nfs41_test_stateid(struct nfs_server *server,
7404                 nfs4_stateid *stateid,
7405                 struct rpc_cred *cred)
7406 {
7407         struct nfs4_exception exception = { };
7408         int err;
7409         do {
7410                 err = _nfs41_test_stateid(server, stateid, cred);
7411                 if (err != -NFS4ERR_DELAY)
7412                         break;
7413                 nfs4_handle_exception(server, err, &exception);
7414         } while (exception.retry);
7415         return err;
7416 }
7417
7418 struct nfs_free_stateid_data {
7419         struct nfs_server *server;
7420         struct nfs41_free_stateid_args args;
7421         struct nfs41_free_stateid_res res;
7422 };
7423
7424 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
7425 {
7426         struct nfs_free_stateid_data *data = calldata;
7427         nfs41_setup_sequence(nfs4_get_session(data->server),
7428                         &data->args.seq_args,
7429                         &data->res.seq_res,
7430                         task);
7431 }
7432
7433 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
7434 {
7435         struct nfs_free_stateid_data *data = calldata;
7436
7437         nfs41_sequence_done(task, &data->res.seq_res);
7438
7439         switch (task->tk_status) {
7440         case -NFS4ERR_DELAY:
7441                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
7442                         rpc_restart_call_prepare(task);
7443         }
7444 }
7445
7446 static void nfs41_free_stateid_release(void *calldata)
7447 {
7448         kfree(calldata);
7449 }
7450
7451 static const struct rpc_call_ops nfs41_free_stateid_ops = {
7452         .rpc_call_prepare = nfs41_free_stateid_prepare,
7453         .rpc_call_done = nfs41_free_stateid_done,
7454         .rpc_release = nfs41_free_stateid_release,
7455 };
7456
7457 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
7458                 nfs4_stateid *stateid,
7459                 struct rpc_cred *cred,
7460                 bool privileged)
7461 {
7462         struct rpc_message msg = {
7463                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7464                 .rpc_cred = cred,
7465         };
7466         struct rpc_task_setup task_setup = {
7467                 .rpc_client = server->client,
7468                 .rpc_message = &msg,
7469                 .callback_ops = &nfs41_free_stateid_ops,
7470                 .flags = RPC_TASK_ASYNC,
7471         };
7472         struct nfs_free_stateid_data *data;
7473
7474         dprintk("NFS call  free_stateid %p\n", stateid);
7475         data = kmalloc(sizeof(*data), GFP_NOFS);
7476         if (!data)
7477                 return ERR_PTR(-ENOMEM);
7478         data->server = server;
7479         nfs4_stateid_copy(&data->args.stateid, stateid);
7480
7481         task_setup.callback_data = data;
7482
7483         msg.rpc_argp = &data->args;
7484         msg.rpc_resp = &data->res;
7485         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
7486         if (privileged)
7487                 nfs4_set_sequence_privileged(&data->args.seq_args);
7488
7489         return rpc_run_task(&task_setup);
7490 }
7491
7492 /**
7493  * nfs41_free_stateid - perform a FREE_STATEID operation
7494  *
7495  * @server: server / transport on which to perform the operation
7496  * @stateid: state ID to release
7497  * @cred: credential
7498  *
7499  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7500  * negative NFS4ERR value is returned.
7501  */
7502 static int nfs41_free_stateid(struct nfs_server *server,
7503                 nfs4_stateid *stateid,
7504                 struct rpc_cred *cred)
7505 {
7506         struct rpc_task *task;
7507         int ret;
7508
7509         task = _nfs41_free_stateid(server, stateid, cred, true);
7510         if (IS_ERR(task))
7511                 return PTR_ERR(task);
7512         ret = rpc_wait_for_completion_task(task);
7513         if (!ret)
7514                 ret = task->tk_status;
7515         rpc_put_task(task);
7516         return ret;
7517 }
7518
7519 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
7520 {
7521         struct rpc_task *task;
7522         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
7523
7524         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
7525         nfs4_free_lock_state(server, lsp);
7526         if (IS_ERR(task))
7527                 return PTR_ERR(task);
7528         rpc_put_task(task);
7529         return 0;
7530 }
7531
7532 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7533                 const nfs4_stateid *s2)
7534 {
7535         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7536                 return false;
7537
7538         if (s1->seqid == s2->seqid)
7539                 return true;
7540         if (s1->seqid == 0 || s2->seqid == 0)
7541                 return true;
7542
7543         return false;
7544 }
7545
7546 #endif /* CONFIG_NFS_V4_1 */
7547
7548 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7549                 const nfs4_stateid *s2)
7550 {
7551         return nfs4_stateid_match(s1, s2);
7552 }
7553
7554
7555 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7556         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7557         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7558         .recover_open   = nfs4_open_reclaim,
7559         .recover_lock   = nfs4_lock_reclaim,
7560         .establish_clid = nfs4_init_clientid,
7561         .detect_trunking = nfs40_discover_server_trunking,
7562 };
7563
7564 #if defined(CONFIG_NFS_V4_1)
7565 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7566         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7567         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7568         .recover_open   = nfs4_open_reclaim,
7569         .recover_lock   = nfs4_lock_reclaim,
7570         .establish_clid = nfs41_init_clientid,
7571         .reclaim_complete = nfs41_proc_reclaim_complete,
7572         .detect_trunking = nfs41_discover_server_trunking,
7573 };
7574 #endif /* CONFIG_NFS_V4_1 */
7575
7576 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7577         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7578         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7579         .recover_open   = nfs4_open_expired,
7580         .recover_lock   = nfs4_lock_expired,
7581         .establish_clid = nfs4_init_clientid,
7582 };
7583
7584 #if defined(CONFIG_NFS_V4_1)
7585 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7586         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7587         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7588         .recover_open   = nfs41_open_expired,
7589         .recover_lock   = nfs41_lock_expired,
7590         .establish_clid = nfs41_init_clientid,
7591 };
7592 #endif /* CONFIG_NFS_V4_1 */
7593
7594 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7595         .sched_state_renewal = nfs4_proc_async_renew,
7596         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7597         .renew_lease = nfs4_proc_renew,
7598 };
7599
7600 #if defined(CONFIG_NFS_V4_1)
7601 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7602         .sched_state_renewal = nfs41_proc_async_sequence,
7603         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7604         .renew_lease = nfs4_proc_sequence,
7605 };
7606 #endif
7607
7608 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7609         .minor_version = 0,
7610         .init_caps = NFS_CAP_READDIRPLUS
7611                 | NFS_CAP_ATOMIC_OPEN
7612                 | NFS_CAP_CHANGE_ATTR
7613                 | NFS_CAP_POSIX_LOCK,
7614         .init_client = nfs40_init_client,
7615         .shutdown_client = nfs40_shutdown_client,
7616         .match_stateid = nfs4_match_stateid,
7617         .find_root_sec = nfs4_find_root_sec,
7618         .free_lock_state = nfs4_release_lockowner,
7619         .call_sync_ops = &nfs40_call_sync_ops,
7620         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7621         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7622         .state_renewal_ops = &nfs40_state_renewal_ops,
7623 };
7624
7625 #if defined(CONFIG_NFS_V4_1)
7626 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7627         .minor_version = 1,
7628         .init_caps = NFS_CAP_READDIRPLUS
7629                 | NFS_CAP_ATOMIC_OPEN
7630                 | NFS_CAP_CHANGE_ATTR
7631                 | NFS_CAP_POSIX_LOCK
7632                 | NFS_CAP_STATEID_NFSV41
7633                 | NFS_CAP_ATOMIC_OPEN_V1,
7634         .init_client = nfs41_init_client,
7635         .shutdown_client = nfs41_shutdown_client,
7636         .match_stateid = nfs41_match_stateid,
7637         .find_root_sec = nfs41_find_root_sec,
7638         .free_lock_state = nfs41_free_lock_state,
7639         .call_sync_ops = &nfs41_call_sync_ops,
7640         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7641         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7642         .state_renewal_ops = &nfs41_state_renewal_ops,
7643 };
7644 #endif
7645
7646 #if defined(CONFIG_NFS_V4_2)
7647 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
7648         .minor_version = 2,
7649         .init_caps = NFS_CAP_READDIRPLUS
7650                 | NFS_CAP_ATOMIC_OPEN
7651                 | NFS_CAP_CHANGE_ATTR
7652                 | NFS_CAP_POSIX_LOCK
7653                 | NFS_CAP_STATEID_NFSV41
7654                 | NFS_CAP_ATOMIC_OPEN_V1,
7655         .init_client = nfs41_init_client,
7656         .shutdown_client = nfs41_shutdown_client,
7657         .match_stateid = nfs41_match_stateid,
7658         .find_root_sec = nfs41_find_root_sec,
7659         .free_lock_state = nfs41_free_lock_state,
7660         .call_sync_ops = &nfs41_call_sync_ops,
7661         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7662         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7663         .state_renewal_ops = &nfs41_state_renewal_ops,
7664 };
7665 #endif
7666
7667 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7668         [0] = &nfs_v4_0_minor_ops,
7669 #if defined(CONFIG_NFS_V4_1)
7670         [1] = &nfs_v4_1_minor_ops,
7671 #endif
7672 #if defined(CONFIG_NFS_V4_2)
7673         [2] = &nfs_v4_2_minor_ops,
7674 #endif
7675 };
7676
7677 static const struct inode_operations nfs4_dir_inode_operations = {
7678         .create         = nfs_create,
7679         .lookup         = nfs_lookup,
7680         .atomic_open    = nfs_atomic_open,
7681         .link           = nfs_link,
7682         .unlink         = nfs_unlink,
7683         .symlink        = nfs_symlink,
7684         .mkdir          = nfs_mkdir,
7685         .rmdir          = nfs_rmdir,
7686         .mknod          = nfs_mknod,
7687         .rename         = nfs_rename,
7688         .permission     = nfs_permission,
7689         .getattr        = nfs_getattr,
7690         .setattr        = nfs_setattr,
7691         .getxattr       = generic_getxattr,
7692         .setxattr       = generic_setxattr,
7693         .listxattr      = generic_listxattr,
7694         .removexattr    = generic_removexattr,
7695 };
7696
7697 static const struct inode_operations nfs4_file_inode_operations = {
7698         .permission     = nfs_permission,
7699         .getattr        = nfs_getattr,
7700         .setattr        = nfs_setattr,
7701         .getxattr       = generic_getxattr,
7702         .setxattr       = generic_setxattr,
7703         .listxattr      = generic_listxattr,
7704         .removexattr    = generic_removexattr,
7705 };
7706
7707 const struct nfs_rpc_ops nfs_v4_clientops = {
7708         .version        = 4,                    /* protocol version */
7709         .dentry_ops     = &nfs4_dentry_operations,
7710         .dir_inode_ops  = &nfs4_dir_inode_operations,
7711         .file_inode_ops = &nfs4_file_inode_operations,
7712         .file_ops       = &nfs4_file_operations,
7713         .getroot        = nfs4_proc_get_root,
7714         .submount       = nfs4_submount,
7715         .try_mount      = nfs4_try_mount,
7716         .getattr        = nfs4_proc_getattr,
7717         .setattr        = nfs4_proc_setattr,
7718         .lookup         = nfs4_proc_lookup,
7719         .access         = nfs4_proc_access,
7720         .readlink       = nfs4_proc_readlink,
7721         .create         = nfs4_proc_create,
7722         .remove         = nfs4_proc_remove,
7723         .unlink_setup   = nfs4_proc_unlink_setup,
7724         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7725         .unlink_done    = nfs4_proc_unlink_done,
7726         .rename         = nfs4_proc_rename,
7727         .rename_setup   = nfs4_proc_rename_setup,
7728         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7729         .rename_done    = nfs4_proc_rename_done,
7730         .link           = nfs4_proc_link,
7731         .symlink        = nfs4_proc_symlink,
7732         .mkdir          = nfs4_proc_mkdir,
7733         .rmdir          = nfs4_proc_remove,
7734         .readdir        = nfs4_proc_readdir,
7735         .mknod          = nfs4_proc_mknod,
7736         .statfs         = nfs4_proc_statfs,
7737         .fsinfo         = nfs4_proc_fsinfo,
7738         .pathconf       = nfs4_proc_pathconf,
7739         .set_capabilities = nfs4_server_capabilities,
7740         .decode_dirent  = nfs4_decode_dirent,
7741         .read_setup     = nfs4_proc_read_setup,
7742         .read_pageio_init = pnfs_pageio_init_read,
7743         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7744         .read_done      = nfs4_read_done,
7745         .write_setup    = nfs4_proc_write_setup,
7746         .write_pageio_init = pnfs_pageio_init_write,
7747         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7748         .write_done     = nfs4_write_done,
7749         .commit_setup   = nfs4_proc_commit_setup,
7750         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7751         .commit_done    = nfs4_commit_done,
7752         .lock           = nfs4_proc_lock,
7753         .clear_acl_cache = nfs4_zap_acl_attr,
7754         .close_context  = nfs4_close_context,
7755         .open_context   = nfs4_atomic_open,
7756         .have_delegation = nfs4_have_delegation,
7757         .return_delegation = nfs4_inode_return_delegation,
7758         .alloc_client   = nfs4_alloc_client,
7759         .init_client    = nfs4_init_client,
7760         .free_client    = nfs4_free_client,
7761         .create_server  = nfs4_create_server,
7762         .clone_server   = nfs_clone_server,
7763 };
7764
7765 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7766         .prefix = XATTR_NAME_NFSV4_ACL,
7767         .list   = nfs4_xattr_list_nfs4_acl,
7768         .get    = nfs4_xattr_get_nfs4_acl,
7769         .set    = nfs4_xattr_set_nfs4_acl,
7770 };
7771
7772 const struct xattr_handler *nfs4_xattr_handlers[] = {
7773         &nfs4_xattr_nfs4_acl_handler,
7774 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7775         &nfs4_xattr_nfs4_label_handler,
7776 #endif
7777         NULL
7778 };
7779
7780 /*
7781  * Local variables:
7782  *  c-basic-offset: 8
7783  * End:
7784  */