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 *, long *);
  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         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_ACCESS:
 162                 return -EACCES;
 163         case -NFS4ERR_FILE_OPEN:
 164                 return -EBUSY;
 165         default:
 166                 dprintk("%s could not handle NFSv4 error %d\n",
 167                                 __func__, -err);
 168                 break;
 169         }
 170         return -EIO;
 171 }
 172
 173 /*
 174  * This is our standard bitmap for GETATTR requests.
 175  */
 176 const u32 nfs4_fattr_bitmap[3] = {
 177         FATTR4_WORD0_TYPE
 178         | FATTR4_WORD0_CHANGE
 179         | FATTR4_WORD0_SIZE
 180         | FATTR4_WORD0_FSID
 181         | FATTR4_WORD0_FILEID,
 182         FATTR4_WORD1_MODE
 183         | FATTR4_WORD1_NUMLINKS
 184         | FATTR4_WORD1_OWNER
 185         | FATTR4_WORD1_OWNER_GROUP
 186         | FATTR4_WORD1_RAWDEV
 187         | FATTR4_WORD1_SPACE_USED
 188         | FATTR4_WORD1_TIME_ACCESS
 189         | FATTR4_WORD1_TIME_METADATA
 190         | FATTR4_WORD1_TIME_MODIFY,
 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 192         FATTR4_WORD2_SECURITY_LABEL
 193 #endif
 194 };
 195
 196 static const u32 nfs4_pnfs_open_bitmap[3] = {
 197         FATTR4_WORD0_TYPE
 198         | FATTR4_WORD0_CHANGE
 199         | FATTR4_WORD0_SIZE
 200         | FATTR4_WORD0_FSID
 201         | FATTR4_WORD0_FILEID,
 202         FATTR4_WORD1_MODE
 203         | FATTR4_WORD1_NUMLINKS
 204         | FATTR4_WORD1_OWNER
 205         | FATTR4_WORD1_OWNER_GROUP
 206         | FATTR4_WORD1_RAWDEV
 207         | FATTR4_WORD1_SPACE_USED
 208         | FATTR4_WORD1_TIME_ACCESS
 209         | FATTR4_WORD1_TIME_METADATA
 210         | FATTR4_WORD1_TIME_MODIFY,
 211         FATTR4_WORD2_MDSTHRESHOLD
 212 };
 213
 214 static const u32 nfs4_open_noattr_bitmap[3] = {
 215         FATTR4_WORD0_TYPE
 216         | FATTR4_WORD0_CHANGE
 217         | FATTR4_WORD0_FILEID,
 218 };
 219
 220 const u32 nfs4_statfs_bitmap[3] = {
 221         FATTR4_WORD0_FILES_AVAIL
 222         | FATTR4_WORD0_FILES_FREE
 223         | FATTR4_WORD0_FILES_TOTAL,
 224         FATTR4_WORD1_SPACE_AVAIL
 225         | FATTR4_WORD1_SPACE_FREE
 226         | FATTR4_WORD1_SPACE_TOTAL
 227 };
 228
 229 const u32 nfs4_pathconf_bitmap[3] = {
 230         FATTR4_WORD0_MAXLINK
 231         | FATTR4_WORD0_MAXNAME,
 232         0
 233 };
 234
 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 236                         | FATTR4_WORD0_MAXREAD
 237                         | FATTR4_WORD0_MAXWRITE
 238                         | FATTR4_WORD0_LEASE_TIME,
 239                         FATTR4_WORD1_TIME_DELTA
 240                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 241                         FATTR4_WORD2_LAYOUT_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static long nfs4_update_delay(long *timeout)
 318 {
 319         long ret;
 320         if (!timeout)
 321                 return NFS4_POLL_RETRY_MAX;
 322         if (*timeout <= 0)
 323                 *timeout = NFS4_POLL_RETRY_MIN;
 324         if (*timeout > NFS4_POLL_RETRY_MAX)
 325                 *timeout = NFS4_POLL_RETRY_MAX;
 326         ret = *timeout;
 327         *timeout <<= 1;
 328         return ret;
 329 }
 330
 331 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 332 {
 333         int res = 0;
 334
 335         might_sleep();
 336
 337         freezable_schedule_timeout_killable_unsafe(
 338                 nfs4_update_delay(timeout));
 339         if (fatal_signal_pending(current))
 340                 res = -ERESTARTSYS;
 341         return res;
 342 }
 343
 344 /* This is the error handling routine for processes that are allowed
 345  * to sleep.
 346  */
 347 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 348 {
 349         struct nfs_client *clp = server->nfs_client;
 350         struct nfs4_state *state = exception->state;
 351         struct inode *inode = exception->inode;
 352         int ret = errorcode;
 353
 354         exception->retry = 0;
 355         switch(errorcode) {
 356                 case 0:
 357                         return 0;
 358                 case -NFS4ERR_OPENMODE:
 359                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 360                                 nfs4_inode_return_delegation(inode);
 361                                 exception->retry = 1;
 362                                 return 0;
 363                         }
 364                         if (state == NULL)
 365                                 break;
 366                         ret = nfs4_schedule_stateid_recovery(server, state);
 367                         if (ret < 0)
 368                                 break;
 369                         goto wait_on_recovery;
 370                 case -NFS4ERR_DELEG_REVOKED:
 371                 case -NFS4ERR_ADMIN_REVOKED:
 372                 case -NFS4ERR_BAD_STATEID:
 373                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 374                                 nfs_remove_bad_delegation(inode);
 375                                 exception->retry = 1;
 376                                 break;
 377                         }
 378                         if (state == NULL)
 379                                 break;
 380                         ret = nfs4_schedule_stateid_recovery(server, state);
 381                         if (ret < 0)
 382                                 break;
 383                         goto wait_on_recovery;
 384                 case -NFS4ERR_EXPIRED:
 385                         if (state != NULL) {
 386                                 ret = nfs4_schedule_stateid_recovery(server, state);
 387                                 if (ret < 0)
 388                                         break;
 389                         }
 390                 case -NFS4ERR_STALE_STATEID:
 391                 case -NFS4ERR_STALE_CLIENTID:
 392                         nfs4_schedule_lease_recovery(clp);
 393                         goto wait_on_recovery;
 394                 case -NFS4ERR_MOVED:
 395                         ret = nfs4_schedule_migration_recovery(server);
 396                         if (ret < 0)
 397                                 break;
 398                         goto wait_on_recovery;
 399                 case -NFS4ERR_LEASE_MOVED:
 400                         nfs4_schedule_lease_moved_recovery(clp);
 401                         goto wait_on_recovery;
 402 #if defined(CONFIG_NFS_V4_1)
 403                 case -NFS4ERR_BADSESSION:
 404                 case -NFS4ERR_BADSLOT:
 405                 case -NFS4ERR_BAD_HIGH_SLOT:
 406                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 407                 case -NFS4ERR_DEADSESSION:
 408                 case -NFS4ERR_SEQ_FALSE_RETRY:
 409                 case -NFS4ERR_SEQ_MISORDERED:
 410                         dprintk("%s ERROR: %d Reset session\n", __func__,
 411                                 errorcode);
 412                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 413                         goto wait_on_recovery;
 414 #endif /* defined(CONFIG_NFS_V4_1) */
 415                 case -NFS4ERR_FILE_OPEN:
 416                         if (exception->timeout > HZ) {
 417                                 /* We have retried a decent amount, time to
 418                                  * fail
 419                                  */
 420                                 ret = -EBUSY;
 421                                 break;
 422                         }
 423                 case -NFS4ERR_GRACE:
 424                 case -NFS4ERR_DELAY:
 425                         ret = nfs4_delay(server->client, &exception->timeout);
 426                         if (ret != 0)
 427                                 break;
 428                 case -NFS4ERR_RETRY_UNCACHED_REP:
 429                 case -NFS4ERR_OLD_STATEID:
 430                         exception->retry = 1;
 431                         break;
 432                 case -NFS4ERR_BADOWNER:
 433                         /* The following works around a Linux server bug! */
 434                 case -NFS4ERR_BADNAME:
 435                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 436                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 437                                 exception->retry = 1;
 438                                 printk(KERN_WARNING "NFS: v4 server %s "
 439                                                 "does not accept raw "
 440                                                 "uid/gids. "
 441                                                 "Reenabling the idmapper.\n",
 442                                                 server->nfs_client->cl_hostname);
 443                         }
 444         }
 445         /* We failed to handle the error */
 446         return nfs4_map_errors(ret);
 447 wait_on_recovery:
 448         ret = nfs4_wait_clnt_recover(clp);
 449         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 450                 return -EIO;
 451         if (ret == 0)
 452                 exception->retry = 1;
 453         return ret;
 454 }
 455
 456 /*
 457  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 458  * or 'false' otherwise.
 459  */
 460 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 461 {
 462         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 463
 464         if (flavor == RPC_AUTH_GSS_KRB5I ||
 465             flavor == RPC_AUTH_GSS_KRB5P)
 466                 return true;
 467
 468         return false;
 469 }
 470
 471 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 472 {
 473         spin_lock(&clp->cl_lock);
 474         if (time_before(clp->cl_last_renewal,timestamp))
 475                 clp->cl_last_renewal = timestamp;
 476         spin_unlock(&clp->cl_lock);
 477 }
 478
 479 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 480 {
 481         do_renew_lease(server->nfs_client, timestamp);
 482 }
 483
 484 struct nfs4_call_sync_data {
 485         const struct nfs_server *seq_server;
 486         struct nfs4_sequence_args *seq_args;
 487         struct nfs4_sequence_res *seq_res;
 488 };
 489
 490 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 491                                struct nfs4_sequence_res *res, int cache_reply)
 492 {
 493         args->sa_slot = NULL;
 494         args->sa_cache_this = cache_reply;
 495         args->sa_privileged = 0;
 496
 497         res->sr_slot = NULL;
 498 }
 499
 500 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 501 {
 502         args->sa_privileged = 1;
 503 }
 504
 505 static int nfs40_setup_sequence(const struct nfs_server *server,
 506                                 struct nfs4_sequence_args *args,
 507                                 struct nfs4_sequence_res *res,
 508                                 struct rpc_task *task)
 509 {
 510         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 511         struct nfs4_slot *slot;
 512
 513         /* slot already allocated? */
 514         if (res->sr_slot != NULL)
 515                 goto out_start;
 516
 517         spin_lock(&tbl->slot_tbl_lock);
 518         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 519                 goto out_sleep;
 520
 521         slot = nfs4_alloc_slot(tbl);
 522         if (IS_ERR(slot)) {
 523                 if (slot == ERR_PTR(-ENOMEM))
 524                         task->tk_timeout = HZ >> 2;
 525                 goto out_sleep;
 526         }
 527         spin_unlock(&tbl->slot_tbl_lock);
 528
 529         args->sa_slot = slot;
 530         res->sr_slot = slot;
 531
 532 out_start:
 533         rpc_call_start(task);
 534         return 0;
 535
 536 out_sleep:
 537         if (args->sa_privileged)
 538                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 539                                 NULL, RPC_PRIORITY_PRIVILEGED);
 540         else
 541                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 542         spin_unlock(&tbl->slot_tbl_lock);
 543         return -EAGAIN;
 544 }
 545
 546 static int nfs40_sequence_done(struct rpc_task *task,
 547                                struct nfs4_sequence_res *res)
 548 {
 549         struct nfs4_slot *slot = res->sr_slot;
 550         struct nfs4_slot_table *tbl;
 551
 552         if (slot == NULL)
 553                 goto out;
 554
 555         tbl = slot->table;
 556         spin_lock(&tbl->slot_tbl_lock);
 557         if (!nfs41_wake_and_assign_slot(tbl, slot))
 558                 nfs4_free_slot(tbl, slot);
 559         spin_unlock(&tbl->slot_tbl_lock);
 560
 561         res->sr_slot = NULL;
 562 out:
 563         return 1;
 564 }
 565
 566 #if defined(CONFIG_NFS_V4_1)
 567
 568 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 569 {
 570         struct nfs4_session *session;
 571         struct nfs4_slot_table *tbl;
 572         struct nfs4_slot *slot = res->sr_slot;
 573         bool send_new_highest_used_slotid = false;
 574
 575         tbl = slot->table;
 576         session = tbl->session;
 577
 578         spin_lock(&tbl->slot_tbl_lock);
 579         /* Be nice to the server: try to ensure that the last transmitted
 580          * value for highest_user_slotid <= target_highest_slotid
 581          */
 582         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 583                 send_new_highest_used_slotid = true;
 584
 585         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 586                 send_new_highest_used_slotid = false;
 587                 goto out_unlock;
 588         }
 589         nfs4_free_slot(tbl, slot);
 590
 591         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 592                 send_new_highest_used_slotid = false;
 593 out_unlock:
 594         spin_unlock(&tbl->slot_tbl_lock);
 595         res->sr_slot = NULL;
 596         if (send_new_highest_used_slotid)
 597                 nfs41_server_notify_highest_slotid_update(session->clp);
 598 }
 599
 600 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 601 {
 602         struct nfs4_session *session;
 603         struct nfs4_slot *slot = res->sr_slot;
 604         struct nfs_client *clp;
 605         bool interrupted = false;
 606         int ret = 1;
 607
 608         if (slot == NULL)
 609                 goto out_noaction;
 610         /* don't increment the sequence number if the task wasn't sent */
 611         if (!RPC_WAS_SENT(task))
 612                 goto out;
 613
 614         session = slot->table->session;
 615
 616         if (slot->interrupted) {
 617                 slot->interrupted = 0;
 618                 interrupted = true;
 619         }
 620
 621         trace_nfs4_sequence_done(session, res);
 622         /* Check the SEQUENCE operation status */
 623         switch (res->sr_status) {
 624         case 0:
 625                 /* Update the slot's sequence and clientid lease timer */
 626                 ++slot->seq_nr;
 627                 clp = session->clp;
 628                 do_renew_lease(clp, res->sr_timestamp);
 629                 /* Check sequence flags */
 630                 if (res->sr_status_flags != 0)
 631                         nfs4_schedule_lease_recovery(clp);
 632                 nfs41_update_target_slotid(slot->table, slot, res);
 633                 break;
 634         case 1:
 635                 /*
 636                  * sr_status remains 1 if an RPC level error occurred.
 637                  * The server may or may not have processed the sequence
 638                  * operation..
 639                  * Mark the slot as having hosted an interrupted RPC call.
 640                  */
 641                 slot->interrupted = 1;
 642                 goto out;
 643         case -NFS4ERR_DELAY:
 644                 /* The server detected a resend of the RPC call and
 645                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 646                  * of RFC5661.
 647                  */
 648                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 649                         __func__,
 650                         slot->slot_nr,
 651                         slot->seq_nr);
 652                 goto out_retry;
 653         case -NFS4ERR_BADSLOT:
 654                 /*
 655                  * The slot id we used was probably retired. Try again
 656                  * using a different slot id.
 657                  */
 658                 goto retry_nowait;
 659         case -NFS4ERR_SEQ_MISORDERED:
 660                 /*
 661                  * Was the last operation on this sequence interrupted?
 662                  * If so, retry after bumping the sequence number.
 663                  */
 664                 if (interrupted) {
 665                         ++slot->seq_nr;
 666                         goto retry_nowait;
 667                 }
 668                 /*
 669                  * Could this slot have been previously retired?
 670                  * If so, then the server may be expecting seq_nr = 1!
 671                  */
 672                 if (slot->seq_nr != 1) {
 673                         slot->seq_nr = 1;
 674                         goto retry_nowait;
 675                 }
 676                 break;
 677         case -NFS4ERR_SEQ_FALSE_RETRY:
 678                 ++slot->seq_nr;
 679                 goto retry_nowait;
 680         default:
 681                 /* Just update the slot sequence no. */
 682                 ++slot->seq_nr;
 683         }
 684 out:
 685         /* The session may be reset by one of the error handlers. */
 686         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 687         nfs41_sequence_free_slot(res);
 688 out_noaction:
 689         return ret;
 690 retry_nowait:
 691         if (rpc_restart_call_prepare(task)) {
 692                 task->tk_status = 0;
 693                 ret = 0;
 694         }
 695         goto out;
 696 out_retry:
 697         if (!rpc_restart_call(task))
 698                 goto out;
 699         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 700         return 0;
 701 }
 702 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 703
 704 static int nfs4_sequence_done(struct rpc_task *task,
 705                                struct nfs4_sequence_res *res)
 706 {
 707         if (res->sr_slot == NULL)
 708                 return 1;
 709         if (!res->sr_slot->table->session)
 710                 return nfs40_sequence_done(task, res);
 711         return nfs41_sequence_done(task, res);
 712 }
 713
 714 int nfs41_setup_sequence(struct nfs4_session *session,
 715                                 struct nfs4_sequence_args *args,
 716                                 struct nfs4_sequence_res *res,
 717                                 struct rpc_task *task)
 718 {
 719         struct nfs4_slot *slot;
 720         struct nfs4_slot_table *tbl;
 721
 722         dprintk("--> %s\n", __func__);
 723         /* slot already allocated? */
 724         if (res->sr_slot != NULL)
 725                 goto out_success;
 726
 727         tbl = &session->fc_slot_table;
 728
 729         task->tk_timeout = 0;
 730
 731         spin_lock(&tbl->slot_tbl_lock);
 732         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 733             !args->sa_privileged) {
 734                 /* The state manager will wait until the slot table is empty */
 735                 dprintk("%s session is draining\n", __func__);
 736                 goto out_sleep;
 737         }
 738
 739         slot = nfs4_alloc_slot(tbl);
 740         if (IS_ERR(slot)) {
 741                 /* If out of memory, try again in 1/4 second */
 742                 if (slot == ERR_PTR(-ENOMEM))
 743                         task->tk_timeout = HZ >> 2;
 744                 dprintk("<-- %s: no free slots\n", __func__);
 745                 goto out_sleep;
 746         }
 747         spin_unlock(&tbl->slot_tbl_lock);
 748
 749         args->sa_slot = slot;
 750
 751         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 752                         slot->slot_nr, slot->seq_nr);
 753
 754         res->sr_slot = slot;
 755         res->sr_timestamp = jiffies;
 756         res->sr_status_flags = 0;
 757         /*
 758          * sr_status is only set in decode_sequence, and so will remain
 759          * set to 1 if an rpc level failure occurs.
 760          */
 761         res->sr_status = 1;
 762         trace_nfs4_setup_sequence(session, args);
 763 out_success:
 764         rpc_call_start(task);
 765         return 0;
 766 out_sleep:
 767         /* Privileged tasks are queued with top priority */
 768         if (args->sa_privileged)
 769                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 770                                 NULL, RPC_PRIORITY_PRIVILEGED);
 771         else
 772                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 773         spin_unlock(&tbl->slot_tbl_lock);
 774         return -EAGAIN;
 775 }
 776 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 777
 778 static int nfs4_setup_sequence(const struct nfs_server *server,
 779                                struct nfs4_sequence_args *args,
 780                                struct nfs4_sequence_res *res,
 781                                struct rpc_task *task)
 782 {
 783         struct nfs4_session *session = nfs4_get_session(server);
 784         int ret = 0;
 785
 786         if (!session)
 787                 return nfs40_setup_sequence(server, args, res, task);
 788
 789         dprintk("--> %s clp %p session %p sr_slot %u\n",
 790                 __func__, session->clp, session, res->sr_slot ?
 791                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 792
 793         ret = nfs41_setup_sequence(session, args, res, task);
 794
 795         dprintk("<-- %s status=%d\n", __func__, ret);
 796         return ret;
 797 }
 798
 799 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 800 {
 801         struct nfs4_call_sync_data *data = calldata;
 802         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 803
 804         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 805
 806         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 807 }
 808
 809 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 810 {
 811         struct nfs4_call_sync_data *data = calldata;
 812
 813         nfs41_sequence_done(task, data->seq_res);
 814 }
 815
 816 static const struct rpc_call_ops nfs41_call_sync_ops = {
 817         .rpc_call_prepare = nfs41_call_sync_prepare,
 818         .rpc_call_done = nfs41_call_sync_done,
 819 };
 820
 821 #else   /* !CONFIG_NFS_V4_1 */
 822
 823 static int nfs4_setup_sequence(const struct nfs_server *server,
 824                                struct nfs4_sequence_args *args,
 825                                struct nfs4_sequence_res *res,
 826                                struct rpc_task *task)
 827 {
 828         return nfs40_setup_sequence(server, args, res, task);
 829 }
 830
 831 static int nfs4_sequence_done(struct rpc_task *task,
 832                                struct nfs4_sequence_res *res)
 833 {
 834         return nfs40_sequence_done(task, res);
 835 }
 836
 837 #endif  /* !CONFIG_NFS_V4_1 */
 838
 839 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 840 {
 841         struct nfs4_call_sync_data *data = calldata;
 842         nfs4_setup_sequence(data->seq_server,
 843                                 data->seq_args, data->seq_res, task);
 844 }
 845
 846 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 847 {
 848         struct nfs4_call_sync_data *data = calldata;
 849         nfs4_sequence_done(task, data->seq_res);
 850 }
 851
 852 static const struct rpc_call_ops nfs40_call_sync_ops = {
 853         .rpc_call_prepare = nfs40_call_sync_prepare,
 854         .rpc_call_done = nfs40_call_sync_done,
 855 };
 856
 857 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 858                                    struct nfs_server *server,
 859                                    struct rpc_message *msg,
 860                                    struct nfs4_sequence_args *args,
 861                                    struct nfs4_sequence_res *res)
 862 {
 863         int ret;
 864         struct rpc_task *task;
 865         struct nfs_client *clp = server->nfs_client;
 866         struct nfs4_call_sync_data data = {
 867                 .seq_server = server,
 868                 .seq_args = args,
 869                 .seq_res = res,
 870         };
 871         struct rpc_task_setup task_setup = {
 872                 .rpc_client = clnt,
 873                 .rpc_message = msg,
 874                 .callback_ops = clp->cl_mvops->call_sync_ops,
 875                 .callback_data = &data
 876         };
 877
 878         task = rpc_run_task(&task_setup);
 879         if (IS_ERR(task))
 880                 ret = PTR_ERR(task);
 881         else {
 882                 ret = task->tk_status;
 883                 rpc_put_task(task);
 884         }
 885         return ret;
 886 }
 887
 888 int nfs4_call_sync(struct rpc_clnt *clnt,
 889                    struct nfs_server *server,
 890                    struct rpc_message *msg,
 891                    struct nfs4_sequence_args *args,
 892                    struct nfs4_sequence_res *res,
 893                    int cache_reply)
 894 {
 895         nfs4_init_sequence(args, res, cache_reply);
 896         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 897 }
 898
 899 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 900 {
 901         struct nfs_inode *nfsi = NFS_I(dir);
 902
 903         spin_lock(&dir->i_lock);
 904         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 905         if (!cinfo->atomic || cinfo->before != dir->i_version)
 906                 nfs_force_lookup_revalidate(dir);
 907         dir->i_version = cinfo->after;
 908         nfs_fscache_invalidate(dir);
 909         spin_unlock(&dir->i_lock);
 910 }
 911
 912 struct nfs4_opendata {
 913         struct kref kref;
 914         struct nfs_openargs o_arg;
 915         struct nfs_openres o_res;
 916         struct nfs_open_confirmargs c_arg;
 917         struct nfs_open_confirmres c_res;
 918         struct nfs4_string owner_name;
 919         struct nfs4_string group_name;
 920         struct nfs_fattr f_attr;
 921         struct nfs4_label *f_label;
 922         struct dentry *dir;
 923         struct dentry *dentry;
 924         struct nfs4_state_owner *owner;
 925         struct nfs4_state *state;
 926         struct iattr attrs;
 927         unsigned long timestamp;
 928         unsigned int rpc_done : 1;
 929         unsigned int file_created : 1;
 930         unsigned int is_recover : 1;
 931         int rpc_status;
 932         int cancelled;
 933 };
 934
 935 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 936                 int err, struct nfs4_exception *exception)
 937 {
 938         if (err != -EINVAL)
 939                 return false;
 940         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 941                 return false;
 942         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 943         exception->retry = 1;
 944         return true;
 945 }
 946
 947 static enum open_claim_type4
 948 nfs4_map_atomic_open_claim(struct nfs_server *server,
 949                 enum open_claim_type4 claim)
 950 {
 951         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 952                 return claim;
 953         switch (claim) {
 954         default:
 955                 return claim;
 956         case NFS4_OPEN_CLAIM_FH:
 957                 return NFS4_OPEN_CLAIM_NULL;
 958         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 959                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 960         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 961                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 962         }
 963 }
 964
 965 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 966 {
 967         p->o_res.f_attr = &p->f_attr;
 968         p->o_res.f_label = p->f_label;
 969         p->o_res.seqid = p->o_arg.seqid;
 970         p->c_res.seqid = p->c_arg.seqid;
 971         p->o_res.server = p->o_arg.server;
 972         p->o_res.access_request = p->o_arg.access;
 973         nfs_fattr_init(&p->f_attr);
 974         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 975 }
 976
 977 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 978                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 979                 const struct iattr *attrs,
 980                 struct nfs4_label *label,
 981                 enum open_claim_type4 claim,
 982                 gfp_t gfp_mask)
 983 {
 984         struct dentry *parent = dget_parent(dentry);
 985         struct inode *dir = parent->d_inode;
 986         struct nfs_server *server = NFS_SERVER(dir);
 987         struct nfs4_opendata *p;
 988
 989         p = kzalloc(sizeof(*p), gfp_mask);
 990         if (p == NULL)
 991                 goto err;
 992
 993         p->f_label = nfs4_label_alloc(server, gfp_mask);
 994         if (IS_ERR(p->f_label))
 995                 goto err_free_p;
 996
 997         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 998         if (p->o_arg.seqid == NULL)
 999                 goto err_free_label;
1000         nfs_sb_active(dentry->d_sb);
1001         p->dentry = dget(dentry);
1002         p->dir = parent;
1003         p->owner = sp;
1004         atomic_inc(&sp->so_count);
1005         p->o_arg.open_flags = flags;
1006         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1007         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1008          * will return permission denied for all bits until close */
1009         if (!(flags & O_EXCL)) {
1010                 /* ask server to check for all possible rights as results
1011                  * are cached */
1012                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1013                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1014         }
1015         p->o_arg.clientid = server->nfs_client->cl_clientid;
1016         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1017         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1018         p->o_arg.name = &dentry->d_name;
1019         p->o_arg.server = server;
1020         p->o_arg.bitmask = nfs4_bitmask(server, label);
1021         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1022         p->o_arg.label = label;
1023         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1024         switch (p->o_arg.claim) {
1025         case NFS4_OPEN_CLAIM_NULL:
1026         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1027         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1028                 p->o_arg.fh = NFS_FH(dir);
1029                 break;
1030         case NFS4_OPEN_CLAIM_PREVIOUS:
1031         case NFS4_OPEN_CLAIM_FH:
1032         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1033         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1034                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1035         }
1036         if (attrs != NULL && attrs->ia_valid != 0) {
1037                 __u32 verf[2];
1038
1039                 p->o_arg.u.attrs = &p->attrs;
1040                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1041
1042                 verf[0] = jiffies;
1043                 verf[1] = current->pid;
1044                 memcpy(p->o_arg.u.verifier.data, verf,
1045                                 sizeof(p->o_arg.u.verifier.data));
1046         }
1047         p->c_arg.fh = &p->o_res.fh;
1048         p->c_arg.stateid = &p->o_res.stateid;
1049         p->c_arg.seqid = p->o_arg.seqid;
1050         nfs4_init_opendata_res(p);
1051         kref_init(&p->kref);
1052         return p;
1053
1054 err_free_label:
1055         nfs4_label_free(p->f_label);
1056 err_free_p:
1057         kfree(p);
1058 err:
1059         dput(parent);
1060         return NULL;
1061 }
1062
1063 static void nfs4_opendata_free(struct kref *kref)
1064 {
1065         struct nfs4_opendata *p = container_of(kref,
1066                         struct nfs4_opendata, kref);
1067         struct super_block *sb = p->dentry->d_sb;
1068
1069         nfs_free_seqid(p->o_arg.seqid);
1070         if (p->state != NULL)
1071                 nfs4_put_open_state(p->state);
1072         nfs4_put_state_owner(p->owner);
1073
1074         nfs4_label_free(p->f_label);
1075
1076         dput(p->dir);
1077         dput(p->dentry);
1078         nfs_sb_deactive(sb);
1079         nfs_fattr_free_names(&p->f_attr);
1080         kfree(p->f_attr.mdsthreshold);
1081         kfree(p);
1082 }
1083
1084 static void nfs4_opendata_put(struct nfs4_opendata *p)
1085 {
1086         if (p != NULL)
1087                 kref_put(&p->kref, nfs4_opendata_free);
1088 }
1089
1090 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1091 {
1092         int ret;
1093
1094         ret = rpc_wait_for_completion_task(task);
1095         return ret;
1096 }
1097
1098 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1099 {
1100         int ret = 0;
1101
1102         if (open_mode & (O_EXCL|O_TRUNC))
1103                 goto out;
1104         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1105                 case FMODE_READ:
1106                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1107                                 && state->n_rdonly != 0;
1108                         break;
1109                 case FMODE_WRITE:
1110                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1111                                 && state->n_wronly != 0;
1112                         break;
1113                 case FMODE_READ|FMODE_WRITE:
1114                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1115                                 && state->n_rdwr != 0;
1116         }
1117 out:
1118         return ret;
1119 }
1120
1121 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1122 {
1123         if (delegation == NULL)
1124                 return 0;
1125         if ((delegation->type & fmode) != fmode)
1126                 return 0;
1127         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1128                 return 0;
1129         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1130                 return 0;
1131         nfs_mark_delegation_referenced(delegation);
1132         return 1;
1133 }
1134
1135 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1136 {
1137         switch (fmode) {
1138                 case FMODE_WRITE:
1139                         state->n_wronly++;
1140                         break;
1141                 case FMODE_READ:
1142                         state->n_rdonly++;
1143                         break;
1144                 case FMODE_READ|FMODE_WRITE:
1145                         state->n_rdwr++;
1146         }
1147         nfs4_state_set_mode_locked(state, state->state | fmode);
1148 }
1149
1150 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1151 {
1152         struct nfs_client *clp = state->owner->so_server->nfs_client;
1153         bool need_recover = false;
1154
1155         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1156                 need_recover = true;
1157         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1158                 need_recover = true;
1159         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1160                 need_recover = true;
1161         if (need_recover)
1162                 nfs4_state_mark_reclaim_nograce(clp, state);
1163 }
1164
1165 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1166                 nfs4_stateid *stateid)
1167 {
1168         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1169                 return true;
1170         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1171                 nfs_test_and_clear_all_open_stateid(state);
1172                 return true;
1173         }
1174         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1175                 return true;
1176         return false;
1177 }
1178
1179 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1180                 nfs4_stateid *stateid, fmode_t fmode)
1181 {
1182         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1183         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1184         case FMODE_WRITE:
1185                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1186                 break;
1187         case FMODE_READ:
1188                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1189                 break;
1190         case 0:
1191                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1192                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1193                 clear_bit(NFS_OPEN_STATE, &state->flags);
1194         }
1195         if (stateid == NULL)
1196                 return;
1197         if (!nfs_need_update_open_stateid(state, stateid))
1198                 return;
1199         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1200                 nfs4_stateid_copy(&state->stateid, stateid);
1201         nfs4_stateid_copy(&state->open_stateid, stateid);
1202 }
1203
1204 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1205 {
1206         write_seqlock(&state->seqlock);
1207         nfs_clear_open_stateid_locked(state, stateid, fmode);
1208         write_sequnlock(&state->seqlock);
1209         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1210                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1211 }
1212
1213 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1214 {
1215         switch (fmode) {
1216                 case FMODE_READ:
1217                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1218                         break;
1219                 case FMODE_WRITE:
1220                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1221                         break;
1222                 case FMODE_READ|FMODE_WRITE:
1223                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1224         }
1225         if (!nfs_need_update_open_stateid(state, stateid))
1226                 return;
1227         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1228                 nfs4_stateid_copy(&state->stateid, stateid);
1229         nfs4_stateid_copy(&state->open_stateid, stateid);
1230 }
1231
1232 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1233 {
1234         /*
1235          * Protect the call to nfs4_state_set_mode_locked and
1236          * serialise the stateid update
1237          */
1238         write_seqlock(&state->seqlock);
1239         if (deleg_stateid != NULL) {
1240                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1241                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1242         }
1243         if (open_stateid != NULL)
1244                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1245         write_sequnlock(&state->seqlock);
1246         spin_lock(&state->owner->so_lock);
1247         update_open_stateflags(state, fmode);
1248         spin_unlock(&state->owner->so_lock);
1249 }
1250
1251 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1252 {
1253         struct nfs_inode *nfsi = NFS_I(state->inode);
1254         struct nfs_delegation *deleg_cur;
1255         int ret = 0;
1256
1257         fmode &= (FMODE_READ|FMODE_WRITE);
1258
1259         rcu_read_lock();
1260         deleg_cur = rcu_dereference(nfsi->delegation);
1261         if (deleg_cur == NULL)
1262                 goto no_delegation;
1263
1264         spin_lock(&deleg_cur->lock);
1265         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1266            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1267             (deleg_cur->type & fmode) != fmode)
1268                 goto no_delegation_unlock;
1269
1270         if (delegation == NULL)
1271                 delegation = &deleg_cur->stateid;
1272         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1273                 goto no_delegation_unlock;
1274
1275         nfs_mark_delegation_referenced(deleg_cur);
1276         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1277         ret = 1;
1278 no_delegation_unlock:
1279         spin_unlock(&deleg_cur->lock);
1280 no_delegation:
1281         rcu_read_unlock();
1282
1283         if (!ret && open_stateid != NULL) {
1284                 __update_open_stateid(state, open_stateid, NULL, fmode);
1285                 ret = 1;
1286         }
1287         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1288                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1289
1290         return ret;
1291 }
1292
1293
1294 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1295 {
1296         struct nfs_delegation *delegation;
1297
1298         rcu_read_lock();
1299         delegation = rcu_dereference(NFS_I(inode)->delegation);
1300         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1301                 rcu_read_unlock();
1302                 return;
1303         }
1304         rcu_read_unlock();
1305         nfs4_inode_return_delegation(inode);
1306 }
1307
1308 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1309 {
1310         struct nfs4_state *state = opendata->state;
1311         struct nfs_inode *nfsi = NFS_I(state->inode);
1312         struct nfs_delegation *delegation;
1313         int open_mode = opendata->o_arg.open_flags;
1314         fmode_t fmode = opendata->o_arg.fmode;
1315         nfs4_stateid stateid;
1316         int ret = -EAGAIN;
1317
1318         for (;;) {
1319                 spin_lock(&state->owner->so_lock);
1320                 if (can_open_cached(state, fmode, open_mode)) {
1321                         update_open_stateflags(state, fmode);
1322                         spin_unlock(&state->owner->so_lock);
1323                         goto out_return_state;
1324                 }
1325                 spin_unlock(&state->owner->so_lock);
1326                 rcu_read_lock();
1327                 delegation = rcu_dereference(nfsi->delegation);
1328                 if (!can_open_delegated(delegation, fmode)) {
1329                         rcu_read_unlock();
1330                         break;
1331                 }
1332                 /* Save the delegation */
1333                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1334                 rcu_read_unlock();
1335                 nfs_release_seqid(opendata->o_arg.seqid);
1336                 if (!opendata->is_recover) {
1337                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1338                         if (ret != 0)
1339                                 goto out;
1340                 }
1341                 ret = -EAGAIN;
1342
1343                 /* Try to update the stateid using the delegation */
1344                 if (update_open_stateid(state, NULL, &stateid, fmode))
1345                         goto out_return_state;
1346         }
1347 out:
1348         return ERR_PTR(ret);
1349 out_return_state:
1350         atomic_inc(&state->count);
1351         return state;
1352 }
1353
1354 static void
1355 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1356 {
1357         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1358         struct nfs_delegation *delegation;
1359         int delegation_flags = 0;
1360
1361         rcu_read_lock();
1362         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1363         if (delegation)
1364                 delegation_flags = delegation->flags;
1365         rcu_read_unlock();
1366         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1367                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1368                                    "returning a delegation for "
1369                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1370                                    clp->cl_hostname);
1371         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1372                 nfs_inode_set_delegation(state->inode,
1373                                          data->owner->so_cred,
1374                                          &data->o_res);
1375         else
1376                 nfs_inode_reclaim_delegation(state->inode,
1377                                              data->owner->so_cred,
1378                                              &data->o_res);
1379 }
1380
1381 /*
1382  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1383  * and update the nfs4_state.
1384  */
1385 static struct nfs4_state *
1386 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1387 {
1388         struct inode *inode = data->state->inode;
1389         struct nfs4_state *state = data->state;
1390         int ret;
1391
1392         if (!data->rpc_done) {
1393                 if (data->rpc_status) {
1394                         ret = data->rpc_status;
1395                         goto err;
1396                 }
1397                 /* cached opens have already been processed */
1398                 goto update;
1399         }
1400
1401         ret = nfs_refresh_inode(inode, &data->f_attr);
1402         if (ret)
1403                 goto err;
1404
1405         if (data->o_res.delegation_type != 0)
1406                 nfs4_opendata_check_deleg(data, state);
1407 update:
1408         update_open_stateid(state, &data->o_res.stateid, NULL,
1409                             data->o_arg.fmode);
1410         atomic_inc(&state->count);
1411
1412         return state;
1413 err:
1414         return ERR_PTR(ret);
1415
1416 }
1417
1418 static struct nfs4_state *
1419 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1420 {
1421         struct inode *inode;
1422         struct nfs4_state *state = NULL;
1423         int ret;
1424
1425         if (!data->rpc_done) {
1426                 state = nfs4_try_open_cached(data);
1427                 goto out;
1428         }
1429
1430         ret = -EAGAIN;
1431         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1432                 goto err;
1433         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1434         ret = PTR_ERR(inode);
1435         if (IS_ERR(inode))
1436                 goto err;
1437         ret = -ENOMEM;
1438         state = nfs4_get_open_state(inode, data->owner);
1439         if (state == NULL)
1440                 goto err_put_inode;
1441         if (data->o_res.delegation_type != 0)
1442                 nfs4_opendata_check_deleg(data, state);
1443         update_open_stateid(state, &data->o_res.stateid, NULL,
1444                         data->o_arg.fmode);
1445         iput(inode);
1446 out:
1447         nfs_release_seqid(data->o_arg.seqid);
1448         return state;
1449 err_put_inode:
1450         iput(inode);
1451 err:
1452         return ERR_PTR(ret);
1453 }
1454
1455 static struct nfs4_state *
1456 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1457 {
1458         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1459                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1460         return _nfs4_opendata_to_nfs4_state(data);
1461 }
1462
1463 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1464 {
1465         struct nfs_inode *nfsi = NFS_I(state->inode);
1466         struct nfs_open_context *ctx;
1467
1468         spin_lock(&state->inode->i_lock);
1469         list_for_each_entry(ctx, &nfsi->open_files, list) {
1470                 if (ctx->state != state)
1471                         continue;
1472                 get_nfs_open_context(ctx);
1473                 spin_unlock(&state->inode->i_lock);
1474                 return ctx;
1475         }
1476         spin_unlock(&state->inode->i_lock);
1477         return ERR_PTR(-ENOENT);
1478 }
1479
1480 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1481                 struct nfs4_state *state, enum open_claim_type4 claim)
1482 {
1483         struct nfs4_opendata *opendata;
1484
1485         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1486                         NULL, NULL, claim, GFP_NOFS);
1487         if (opendata == NULL)
1488                 return ERR_PTR(-ENOMEM);
1489         opendata->state = state;
1490         atomic_inc(&state->count);
1491         return opendata;
1492 }
1493
1494 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1495 {
1496         struct nfs4_state *newstate;
1497         int ret;
1498
1499         opendata->o_arg.open_flags = 0;
1500         opendata->o_arg.fmode = fmode;
1501         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1502         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1503         nfs4_init_opendata_res(opendata);
1504         ret = _nfs4_recover_proc_open(opendata);
1505         if (ret != 0)
1506                 return ret;
1507         newstate = nfs4_opendata_to_nfs4_state(opendata);
1508         if (IS_ERR(newstate))
1509                 return PTR_ERR(newstate);
1510         nfs4_close_state(newstate, fmode);
1511         *res = newstate;
1512         return 0;
1513 }
1514
1515 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1516 {
1517         struct nfs4_state *newstate;
1518         int ret;
1519
1520         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1521         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1522         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1523         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1524         /* memory barrier prior to reading state->n_* */
1525         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1526         clear_bit(NFS_OPEN_STATE, &state->flags);
1527         smp_rmb();
1528         if (state->n_rdwr != 0) {
1529                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1530                 if (ret != 0)
1531                         return ret;
1532                 if (newstate != state)
1533                         return -ESTALE;
1534         }
1535         if (state->n_wronly != 0) {
1536                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1537                 if (ret != 0)
1538                         return ret;
1539                 if (newstate != state)
1540                         return -ESTALE;
1541         }
1542         if (state->n_rdonly != 0) {
1543                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1544                 if (ret != 0)
1545                         return ret;
1546                 if (newstate != state)
1547                         return -ESTALE;
1548         }
1549         /*
1550          * We may have performed cached opens for all three recoveries.
1551          * Check if we need to update the current stateid.
1552          */
1553         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1554             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1555                 write_seqlock(&state->seqlock);
1556                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1557                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1558                 write_sequnlock(&state->seqlock);
1559         }
1560         return 0;
1561 }
1562
1563 /*
1564  * OPEN_RECLAIM:
1565  *      reclaim state on the server after a reboot.
1566  */
1567 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1568 {
1569         struct nfs_delegation *delegation;
1570         struct nfs4_opendata *opendata;
1571         fmode_t delegation_type = 0;
1572         int status;
1573
1574         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1575                         NFS4_OPEN_CLAIM_PREVIOUS);
1576         if (IS_ERR(opendata))
1577                 return PTR_ERR(opendata);
1578         rcu_read_lock();
1579         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1580         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1581                 delegation_type = delegation->type;
1582         rcu_read_unlock();
1583         opendata->o_arg.u.delegation_type = delegation_type;
1584         status = nfs4_open_recover(opendata, state);
1585         nfs4_opendata_put(opendata);
1586         return status;
1587 }
1588
1589 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1590 {
1591         struct nfs_server *server = NFS_SERVER(state->inode);
1592         struct nfs4_exception exception = { };
1593         int err;
1594         do {
1595                 err = _nfs4_do_open_reclaim(ctx, state);
1596                 trace_nfs4_open_reclaim(ctx, 0, err);
1597                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1598                         continue;
1599                 if (err != -NFS4ERR_DELAY)
1600                         break;
1601                 nfs4_handle_exception(server, err, &exception);
1602         } while (exception.retry);
1603         return err;
1604 }
1605
1606 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1607 {
1608         struct nfs_open_context *ctx;
1609         int ret;
1610
1611         ctx = nfs4_state_find_open_context(state);
1612         if (IS_ERR(ctx))
1613                 return -EAGAIN;
1614         ret = nfs4_do_open_reclaim(ctx, state);
1615         put_nfs_open_context(ctx);
1616         return ret;
1617 }
1618
1619 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1620 {
1621         switch (err) {
1622                 default:
1623                         printk(KERN_ERR "NFS: %s: unhandled error "
1624                                         "%d.\n", __func__, err);
1625                 case 0:
1626                 case -ENOENT:
1627                 case -ESTALE:
1628                         break;
1629                 case -NFS4ERR_BADSESSION:
1630                 case -NFS4ERR_BADSLOT:
1631                 case -NFS4ERR_BAD_HIGH_SLOT:
1632                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1633                 case -NFS4ERR_DEADSESSION:
1634                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1635                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1636                         return -EAGAIN;
1637                 case -NFS4ERR_STALE_CLIENTID:
1638                 case -NFS4ERR_STALE_STATEID:
1639                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1640                 case -NFS4ERR_EXPIRED:
1641                         /* Don't recall a delegation if it was lost */
1642                         nfs4_schedule_lease_recovery(server->nfs_client);
1643                         return -EAGAIN;
1644                 case -NFS4ERR_MOVED:
1645                         nfs4_schedule_migration_recovery(server);
1646                         return -EAGAIN;
1647                 case -NFS4ERR_LEASE_MOVED:
1648                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1649                         return -EAGAIN;
1650                 case -NFS4ERR_DELEG_REVOKED:
1651                 case -NFS4ERR_ADMIN_REVOKED:
1652                 case -NFS4ERR_BAD_STATEID:
1653                 case -NFS4ERR_OPENMODE:
1654                         nfs_inode_find_state_and_recover(state->inode,
1655                                         stateid);
1656                         nfs4_schedule_stateid_recovery(server, state);
1657                         return 0;
1658                 case -NFS4ERR_DELAY:
1659                 case -NFS4ERR_GRACE:
1660                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1661                         ssleep(1);
1662                         return -EAGAIN;
1663                 case -ENOMEM:
1664                 case -NFS4ERR_DENIED:
1665                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1666                         return 0;
1667         }
1668         return err;
1669 }
1670
1671 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1672 {
1673         struct nfs_server *server = NFS_SERVER(state->inode);
1674         struct nfs4_opendata *opendata;
1675         int err;
1676
1677         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1678                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1679         if (IS_ERR(opendata))
1680                 return PTR_ERR(opendata);
1681         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1682         err = nfs4_open_recover(opendata, state);
1683         nfs4_opendata_put(opendata);
1684         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1685 }
1686
1687 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1688 {
1689         struct nfs4_opendata *data = calldata;
1690
1691         nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1692                                 &data->c_res.seq_res, task);
1693 }
1694
1695 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1696 {
1697         struct nfs4_opendata *data = calldata;
1698
1699         nfs40_sequence_done(task, &data->c_res.seq_res);
1700
1701         data->rpc_status = task->tk_status;
1702         if (data->rpc_status == 0) {
1703                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1704                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1705                 renew_lease(data->o_res.server, data->timestamp);
1706                 data->rpc_done = 1;
1707         }
1708 }
1709
1710 static void nfs4_open_confirm_release(void *calldata)
1711 {
1712         struct nfs4_opendata *data = calldata;
1713         struct nfs4_state *state = NULL;
1714
1715         /* If this request hasn't been cancelled, do nothing */
1716         if (data->cancelled == 0)
1717                 goto out_free;
1718         /* In case of error, no cleanup! */
1719         if (!data->rpc_done)
1720                 goto out_free;
1721         state = nfs4_opendata_to_nfs4_state(data);
1722         if (!IS_ERR(state))
1723                 nfs4_close_state(state, data->o_arg.fmode);
1724 out_free:
1725         nfs4_opendata_put(data);
1726 }
1727
1728 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1729         .rpc_call_prepare = nfs4_open_confirm_prepare,
1730         .rpc_call_done = nfs4_open_confirm_done,
1731         .rpc_release = nfs4_open_confirm_release,
1732 };
1733
1734 /*
1735  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1736  */
1737 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1738 {
1739         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1740         struct rpc_task *task;
1741         struct  rpc_message msg = {
1742                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1743                 .rpc_argp = &data->c_arg,
1744                 .rpc_resp = &data->c_res,
1745                 .rpc_cred = data->owner->so_cred,
1746         };
1747         struct rpc_task_setup task_setup_data = {
1748                 .rpc_client = server->client,
1749                 .rpc_message = &msg,
1750                 .callback_ops = &nfs4_open_confirm_ops,
1751                 .callback_data = data,
1752                 .workqueue = nfsiod_workqueue,
1753                 .flags = RPC_TASK_ASYNC,
1754         };
1755         int status;
1756
1757         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1758         kref_get(&data->kref);
1759         data->rpc_done = 0;
1760         data->rpc_status = 0;
1761         data->timestamp = jiffies;
1762         task = rpc_run_task(&task_setup_data);
1763         if (IS_ERR(task))
1764                 return PTR_ERR(task);
1765         status = nfs4_wait_for_completion_rpc_task(task);
1766         if (status != 0) {
1767                 data->cancelled = 1;
1768                 smp_wmb();
1769         } else
1770                 status = data->rpc_status;
1771         rpc_put_task(task);
1772         return status;
1773 }
1774
1775 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1776 {
1777         struct nfs4_opendata *data = calldata;
1778         struct nfs4_state_owner *sp = data->owner;
1779         struct nfs_client *clp = sp->so_server->nfs_client;
1780
1781         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1782                 goto out_wait;
1783         /*
1784          * Check if we still need to send an OPEN call, or if we can use
1785          * a delegation instead.
1786          */
1787         if (data->state != NULL) {
1788                 struct nfs_delegation *delegation;
1789
1790                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1791                         goto out_no_action;
1792                 rcu_read_lock();
1793                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1794                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1795                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1796                     can_open_delegated(delegation, data->o_arg.fmode))
1797                         goto unlock_no_action;
1798                 rcu_read_unlock();
1799         }
1800         /* Update client id. */
1801         data->o_arg.clientid = clp->cl_clientid;
1802         switch (data->o_arg.claim) {
1803         case NFS4_OPEN_CLAIM_PREVIOUS:
1804         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1805         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1806                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1807         case NFS4_OPEN_CLAIM_FH:
1808                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1809                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1810         }
1811         data->timestamp = jiffies;
1812         if (nfs4_setup_sequence(data->o_arg.server,
1813                                 &data->o_arg.seq_args,
1814                                 &data->o_res.seq_res,
1815                                 task) != 0)
1816                 nfs_release_seqid(data->o_arg.seqid);
1817
1818         /* Set the create mode (note dependency on the session type) */
1819         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1820         if (data->o_arg.open_flags & O_EXCL) {
1821                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1822                 if (nfs4_has_persistent_session(clp))
1823                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1824                 else if (clp->cl_mvops->minor_version > 0)
1825                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1826         }
1827         return;
1828 unlock_no_action:
1829         rcu_read_unlock();
1830 out_no_action:
1831         task->tk_action = NULL;
1832 out_wait:
1833         nfs4_sequence_done(task, &data->o_res.seq_res);
1834 }
1835
1836 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1837 {
1838         struct nfs4_opendata *data = calldata;
1839
1840         data->rpc_status = task->tk_status;
1841
1842         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1843                 return;
1844
1845         if (task->tk_status == 0) {
1846                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1847                         switch (data->o_res.f_attr->mode & S_IFMT) {
1848                         case S_IFREG:
1849                                 break;
1850                         case S_IFLNK:
1851                                 data->rpc_status = -ELOOP;
1852                                 break;
1853                         case S_IFDIR:
1854                                 data->rpc_status = -EISDIR;
1855                                 break;
1856                         default:
1857                                 data->rpc_status = -ENOTDIR;
1858                         }
1859                 }
1860                 renew_lease(data->o_res.server, data->timestamp);
1861                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1862                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1863         }
1864         data->rpc_done = 1;
1865 }
1866
1867 static void nfs4_open_release(void *calldata)
1868 {
1869         struct nfs4_opendata *data = calldata;
1870         struct nfs4_state *state = NULL;
1871
1872         /* If this request hasn't been cancelled, do nothing */
1873         if (data->cancelled == 0)
1874                 goto out_free;
1875         /* In case of error, no cleanup! */
1876         if (data->rpc_status != 0 || !data->rpc_done)
1877                 goto out_free;
1878         /* In case we need an open_confirm, no cleanup! */
1879         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1880                 goto out_free;
1881         state = nfs4_opendata_to_nfs4_state(data);
1882         if (!IS_ERR(state))
1883                 nfs4_close_state(state, data->o_arg.fmode);
1884 out_free:
1885         nfs4_opendata_put(data);
1886 }
1887
1888 static const struct rpc_call_ops nfs4_open_ops = {
1889         .rpc_call_prepare = nfs4_open_prepare,
1890         .rpc_call_done = nfs4_open_done,
1891         .rpc_release = nfs4_open_release,
1892 };
1893
1894 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1895 {
1896         struct inode *dir = data->dir->d_inode;
1897         struct nfs_server *server = NFS_SERVER(dir);
1898         struct nfs_openargs *o_arg = &data->o_arg;
1899         struct nfs_openres *o_res = &data->o_res;
1900         struct rpc_task *task;
1901         struct rpc_message msg = {
1902                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1903                 .rpc_argp = o_arg,
1904                 .rpc_resp = o_res,
1905                 .rpc_cred = data->owner->so_cred,
1906         };
1907         struct rpc_task_setup task_setup_data = {
1908                 .rpc_client = server->client,
1909                 .rpc_message = &msg,
1910                 .callback_ops = &nfs4_open_ops,
1911                 .callback_data = data,
1912                 .workqueue = nfsiod_workqueue,
1913                 .flags = RPC_TASK_ASYNC,
1914         };
1915         int status;
1916
1917         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1918         kref_get(&data->kref);
1919         data->rpc_done = 0;
1920         data->rpc_status = 0;
1921         data->cancelled = 0;
1922         data->is_recover = 0;
1923         if (isrecover) {
1924                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1925                 data->is_recover = 1;
1926         }
1927         task = rpc_run_task(&task_setup_data);
1928         if (IS_ERR(task))
1929                 return PTR_ERR(task);
1930         status = nfs4_wait_for_completion_rpc_task(task);
1931         if (status != 0) {
1932                 data->cancelled = 1;
1933                 smp_wmb();
1934         } else
1935                 status = data->rpc_status;
1936         rpc_put_task(task);
1937
1938         return status;
1939 }
1940
1941 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1942 {
1943         struct inode *dir = data->dir->d_inode;
1944         struct nfs_openres *o_res = &data->o_res;
1945         int status;
1946
1947         status = nfs4_run_open_task(data, 1);
1948         if (status != 0 || !data->rpc_done)
1949                 return status;
1950
1951         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1952
1953         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1954                 status = _nfs4_proc_open_confirm(data);
1955                 if (status != 0)
1956                         return status;
1957         }
1958
1959         return status;
1960 }
1961
1962 /*
1963  * Additional permission checks in order to distinguish between an
1964  * open for read, and an open for execute. This works around the
1965  * fact that NFSv4 OPEN treats read and execute permissions as being
1966  * the same.
1967  * Note that in the non-execute case, we want to turn off permission
1968  * checking if we just created a new file (POSIX open() semantics).
1969  */
1970 static int nfs4_opendata_access(struct rpc_cred *cred,
1971                                 struct nfs4_opendata *opendata,
1972                                 struct nfs4_state *state, fmode_t fmode,
1973                                 int openflags)
1974 {
1975         struct nfs_access_entry cache;
1976         u32 mask;
1977
1978         /* access call failed or for some reason the server doesn't
1979          * support any access modes -- defer access call until later */
1980         if (opendata->o_res.access_supported == 0)
1981                 return 0;
1982
1983         mask = 0;
1984         /*
1985          * Use openflags to check for exec, because fmode won't
1986          * always have FMODE_EXEC set when file open for exec.
1987          */
1988         if (openflags & __FMODE_EXEC) {
1989                 /* ONLY check for exec rights */
1990                 mask = MAY_EXEC;
1991         } else if ((fmode & FMODE_READ) && !opendata->file_created)
1992                 mask = MAY_READ;
1993
1994         cache.cred = cred;
1995         cache.jiffies = jiffies;
1996         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1997         nfs_access_add_cache(state->inode, &cache);
1998
1999         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2000                 return 0;
2001
2002         /* even though OPEN succeeded, access is denied. Close the file */
2003         nfs4_close_state(state, fmode);
2004         return -EACCES;
2005 }
2006
2007 /*
2008  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2009  */
2010 static int _nfs4_proc_open(struct nfs4_opendata *data)
2011 {
2012         struct inode *dir = data->dir->d_inode;
2013         struct nfs_server *server = NFS_SERVER(dir);
2014         struct nfs_openargs *o_arg = &data->o_arg;
2015         struct nfs_openres *o_res = &data->o_res;
2016         int status;
2017
2018         status = nfs4_run_open_task(data, 0);
2019         if (!data->rpc_done)
2020                 return status;
2021         if (status != 0) {
2022                 if (status == -NFS4ERR_BADNAME &&
2023                                 !(o_arg->open_flags & O_CREAT))
2024                         return -ENOENT;
2025                 return status;
2026         }
2027
2028         nfs_fattr_map_and_free_names(server, &data->f_attr);
2029
2030         if (o_arg->open_flags & O_CREAT) {
2031                 update_changeattr(dir, &o_res->cinfo);
2032                 if (o_arg->open_flags & O_EXCL)
2033                         data->file_created = 1;
2034                 else if (o_res->cinfo.before != o_res->cinfo.after)
2035                         data->file_created = 1;
2036         }
2037         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2038                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2039         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2040                 status = _nfs4_proc_open_confirm(data);
2041                 if (status != 0)
2042                         return status;
2043         }
2044         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2045                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2046         return 0;
2047 }
2048
2049 static int nfs4_recover_expired_lease(struct nfs_server *server)
2050 {
2051         return nfs4_client_recover_expired_lease(server->nfs_client);
2052 }
2053
2054 /*
2055  * OPEN_EXPIRED:
2056  *      reclaim state on the server after a network partition.
2057  *      Assumes caller holds the appropriate lock
2058  */
2059 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2060 {
2061         struct nfs4_opendata *opendata;
2062         int ret;
2063
2064         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2065                         NFS4_OPEN_CLAIM_FH);
2066         if (IS_ERR(opendata))
2067                 return PTR_ERR(opendata);
2068         ret = nfs4_open_recover(opendata, state);
2069         if (ret == -ESTALE)
2070                 d_drop(ctx->dentry);
2071         nfs4_opendata_put(opendata);
2072         return ret;
2073 }
2074
2075 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2076 {
2077         struct nfs_server *server = NFS_SERVER(state->inode);
2078         struct nfs4_exception exception = { };
2079         int err;
2080
2081         do {
2082                 err = _nfs4_open_expired(ctx, state);
2083                 trace_nfs4_open_expired(ctx, 0, err);
2084                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2085                         continue;
2086                 switch (err) {
2087                 default:
2088                         goto out;
2089                 case -NFS4ERR_GRACE:
2090                 case -NFS4ERR_DELAY:
2091                         nfs4_handle_exception(server, err, &exception);
2092                         err = 0;
2093                 }
2094         } while (exception.retry);
2095 out:
2096         return err;
2097 }
2098
2099 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2100 {
2101         struct nfs_open_context *ctx;
2102         int ret;
2103
2104         ctx = nfs4_state_find_open_context(state);
2105         if (IS_ERR(ctx))
2106                 return -EAGAIN;
2107         ret = nfs4_do_open_expired(ctx, state);
2108         put_nfs_open_context(ctx);
2109         return ret;
2110 }
2111
2112 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2113 {
2114         nfs_remove_bad_delegation(state->inode);
2115         write_seqlock(&state->seqlock);
2116         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2117         write_sequnlock(&state->seqlock);
2118         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2119 }
2120
2121 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2122 {
2123         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2124                 nfs_finish_clear_delegation_stateid(state);
2125 }
2126
2127 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2128 {
2129         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2130         nfs40_clear_delegation_stateid(state);
2131         return nfs4_open_expired(sp, state);
2132 }
2133
2134 #if defined(CONFIG_NFS_V4_1)
2135 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2136 {
2137         struct nfs_server *server = NFS_SERVER(state->inode);
2138         nfs4_stateid *stateid = &state->stateid;
2139         struct nfs_delegation *delegation;
2140         struct rpc_cred *cred = NULL;
2141         int status = -NFS4ERR_BAD_STATEID;
2142
2143         /* If a state reset has been done, test_stateid is unneeded */
2144         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2145                 return;
2146
2147         /* Get the delegation credential for use by test/free_stateid */
2148         rcu_read_lock();
2149         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2150         if (delegation != NULL &&
2151             nfs4_stateid_match(&delegation->stateid, stateid)) {
2152                 cred = get_rpccred(delegation->cred);
2153                 rcu_read_unlock();
2154                 status = nfs41_test_stateid(server, stateid, cred);
2155                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2156         } else
2157                 rcu_read_unlock();
2158
2159         if (status != NFS_OK) {
2160                 /* Free the stateid unless the server explicitly
2161                  * informs us the stateid is unrecognized. */
2162                 if (status != -NFS4ERR_BAD_STATEID)
2163                         nfs41_free_stateid(server, stateid, cred);
2164                 nfs_remove_bad_delegation(state->inode);
2165
2166                 write_seqlock(&state->seqlock);
2167                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2168                 write_sequnlock(&state->seqlock);
2169                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2170         }
2171
2172         if (cred != NULL)
2173                 put_rpccred(cred);
2174 }
2175
2176 /**
2177  * nfs41_check_open_stateid - possibly free an open stateid
2178  *
2179  * @state: NFSv4 state for an inode
2180  *
2181  * Returns NFS_OK if recovery for this stateid is now finished.
2182  * Otherwise a negative NFS4ERR value is returned.
2183  */
2184 static int nfs41_check_open_stateid(struct nfs4_state *state)
2185 {
2186         struct nfs_server *server = NFS_SERVER(state->inode);
2187         nfs4_stateid *stateid = &state->open_stateid;
2188         struct rpc_cred *cred = state->owner->so_cred;
2189         int status;
2190
2191         /* If a state reset has been done, test_stateid is unneeded */
2192         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2193             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2194             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2195                 return -NFS4ERR_BAD_STATEID;
2196
2197         status = nfs41_test_stateid(server, stateid, cred);
2198         trace_nfs4_test_open_stateid(state, NULL, status);
2199         if (status != NFS_OK) {
2200                 /* Free the stateid unless the server explicitly
2201                  * informs us the stateid is unrecognized. */
2202                 if (status != -NFS4ERR_BAD_STATEID)
2203                         nfs41_free_stateid(server, stateid, cred);
2204
2205                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2206                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2207                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2208                 clear_bit(NFS_OPEN_STATE, &state->flags);
2209         }
2210         return status;
2211 }
2212
2213 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2214 {
2215         int status;
2216
2217         nfs41_clear_delegation_stateid(state);
2218         status = nfs41_check_open_stateid(state);
2219         if (status != NFS_OK)
2220                 status = nfs4_open_expired(sp, state);
2221         return status;
2222 }
2223 #endif
2224
2225 /*
2226  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2227  * fields corresponding to attributes that were used to store the verifier.
2228  * Make sure we clobber those fields in the later setattr call
2229  */
2230 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2231 {
2232         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2233             !(sattr->ia_valid & ATTR_ATIME_SET))
2234                 sattr->ia_valid |= ATTR_ATIME;
2235
2236         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2237             !(sattr->ia_valid & ATTR_MTIME_SET))
2238                 sattr->ia_valid |= ATTR_MTIME;
2239 }
2240
2241 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2242                 fmode_t fmode,
2243                 int flags,
2244                 struct nfs_open_context *ctx)
2245 {
2246         struct nfs4_state_owner *sp = opendata->owner;
2247         struct nfs_server *server = sp->so_server;
2248         struct dentry *dentry;
2249         struct nfs4_state *state;
2250         unsigned int seq;
2251         int ret;
2252
2253         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2254
2255         ret = _nfs4_proc_open(opendata);
2256         if (ret != 0)
2257                 goto out;
2258
2259         state = nfs4_opendata_to_nfs4_state(opendata);
2260         ret = PTR_ERR(state);
2261         if (IS_ERR(state))
2262                 goto out;
2263         if (server->caps & NFS_CAP_POSIX_LOCK)
2264                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2265
2266         dentry = opendata->dentry;
2267         if (dentry->d_inode == NULL) {
2268                 /* FIXME: Is this d_drop() ever needed? */
2269                 d_drop(dentry);
2270                 dentry = d_add_unique(dentry, igrab(state->inode));
2271                 if (dentry == NULL) {
2272                         dentry = opendata->dentry;
2273                 } else if (dentry != ctx->dentry) {
2274                         dput(ctx->dentry);
2275                         ctx->dentry = dget(dentry);
2276                 }
2277                 nfs_set_verifier(dentry,
2278                                 nfs_save_change_attribute(opendata->dir->d_inode));
2279         }
2280
2281         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2282         if (ret != 0)
2283                 goto out;
2284
2285         ctx->state = state;
2286         if (dentry->d_inode == state->inode) {
2287                 nfs_inode_attach_open_context(ctx);
2288                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2289                         nfs4_schedule_stateid_recovery(server, state);
2290         }
2291 out:
2292         return ret;
2293 }
2294
2295 /*
2296  * Returns a referenced nfs4_state
2297  */
2298 static int _nfs4_do_open(struct inode *dir,
2299                         struct nfs_open_context *ctx,
2300                         int flags,
2301                         struct iattr *sattr,
2302                         struct nfs4_label *label,
2303                         int *opened)
2304 {
2305         struct nfs4_state_owner  *sp;
2306         struct nfs4_state     *state = NULL;
2307         struct nfs_server       *server = NFS_SERVER(dir);
2308         struct nfs4_opendata *opendata;
2309         struct dentry *dentry = ctx->dentry;
2310         struct rpc_cred *cred = ctx->cred;
2311         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2312         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2313         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2314         struct nfs4_label *olabel = NULL;
2315         int status;
2316
2317         /* Protect against reboot recovery conflicts */
2318         status = -ENOMEM;
2319         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2320         if (sp == NULL) {
2321                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2322                 goto out_err;
2323         }
2324         status = nfs4_recover_expired_lease(server);
2325         if (status != 0)
2326                 goto err_put_state_owner;
2327         if (dentry->d_inode != NULL)
2328                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2329         status = -ENOMEM;
2330         if (dentry->d_inode)
2331                 claim = NFS4_OPEN_CLAIM_FH;
2332         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2333                         label, claim, GFP_KERNEL);
2334         if (opendata == NULL)
2335                 goto err_put_state_owner;
2336
2337         if (label) {
2338                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2339                 if (IS_ERR(olabel)) {
2340                         status = PTR_ERR(olabel);
2341                         goto err_opendata_put;
2342                 }
2343         }
2344
2345         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2346                 if (!opendata->f_attr.mdsthreshold) {
2347                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2348                         if (!opendata->f_attr.mdsthreshold)
2349                                 goto err_free_label;
2350                 }
2351                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2352         }
2353         if (dentry->d_inode != NULL)
2354                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2355
2356         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2357         if (status != 0)
2358                 goto err_free_label;
2359         state = ctx->state;
2360
2361         if ((opendata->o_arg.open_flags & O_EXCL) &&
2362             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2363                 nfs4_exclusive_attrset(opendata, sattr);
2364
2365                 nfs_fattr_init(opendata->o_res.f_attr);
2366                 status = nfs4_do_setattr(state->inode, cred,
2367                                 opendata->o_res.f_attr, sattr,
2368                                 state, label, olabel);
2369                 if (status == 0) {
2370                         nfs_setattr_update_inode(state->inode, sattr);
2371                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2372                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2373                 }
2374         }
2375         if (opendata->file_created)
2376                 *opened |= FILE_CREATED;
2377
2378         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2379                 *ctx_th = opendata->f_attr.mdsthreshold;
2380                 opendata->f_attr.mdsthreshold = NULL;
2381         }
2382
2383         nfs4_label_free(olabel);
2384
2385         nfs4_opendata_put(opendata);
2386         nfs4_put_state_owner(sp);
2387         return 0;
2388 err_free_label:
2389         nfs4_label_free(olabel);
2390 err_opendata_put:
2391         nfs4_opendata_put(opendata);
2392 err_put_state_owner:
2393         nfs4_put_state_owner(sp);
2394 out_err:
2395         return status;
2396 }
2397
2398
2399 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2400                                         struct nfs_open_context *ctx,
2401                                         int flags,
2402                                         struct iattr *sattr,
2403                                         struct nfs4_label *label,
2404                                         int *opened)
2405 {
2406         struct nfs_server *server = NFS_SERVER(dir);
2407         struct nfs4_exception exception = { };
2408         struct nfs4_state *res;
2409         int status;
2410
2411         do {
2412                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2413                 res = ctx->state;
2414                 trace_nfs4_open_file(ctx, flags, status);
2415                 if (status == 0)
2416                         break;
2417                 /* NOTE: BAD_SEQID means the server and client disagree about the
2418                  * book-keeping w.r.t. state-changing operations
2419                  * (OPEN/CLOSE/LOCK/LOCKU...)
2420                  * It is actually a sign of a bug on the client or on the server.
2421                  *
2422                  * If we receive a BAD_SEQID error in the particular case of
2423                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2424                  * have unhashed the old state_owner for us, and that we can
2425                  * therefore safely retry using a new one. We should still warn
2426                  * the user though...
2427                  */
2428                 if (status == -NFS4ERR_BAD_SEQID) {
2429                         pr_warn_ratelimited("NFS: v4 server %s "
2430                                         " returned a bad sequence-id error!\n",
2431                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2432                         exception.retry = 1;
2433                         continue;
2434                 }
2435                 /*
2436                  * BAD_STATEID on OPEN means that the server cancelled our
2437                  * state before it received the OPEN_CONFIRM.
2438                  * Recover by retrying the request as per the discussion
2439                  * on Page 181 of RFC3530.
2440                  */
2441                 if (status == -NFS4ERR_BAD_STATEID) {
2442                         exception.retry = 1;
2443                         continue;
2444                 }
2445                 if (status == -EAGAIN) {
2446                         /* We must have found a delegation */
2447                         exception.retry = 1;
2448                         continue;
2449                 }
2450                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2451                         continue;
2452                 res = ERR_PTR(nfs4_handle_exception(server,
2453                                         status, &exception));
2454         } while (exception.retry);
2455         return res;
2456 }
2457
2458 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2459                             struct nfs_fattr *fattr, struct iattr *sattr,
2460                             struct nfs4_state *state, struct nfs4_label *ilabel,
2461                             struct nfs4_label *olabel)
2462 {
2463         struct nfs_server *server = NFS_SERVER(inode);
2464         struct nfs_setattrargs  arg = {
2465                 .fh             = NFS_FH(inode),
2466                 .iap            = sattr,
2467                 .server         = server,
2468                 .bitmask = server->attr_bitmask,
2469                 .label          = ilabel,
2470         };
2471         struct nfs_setattrres  res = {
2472                 .fattr          = fattr,
2473                 .label          = olabel,
2474                 .server         = server,
2475         };
2476         struct rpc_message msg = {
2477                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2478                 .rpc_argp       = &arg,
2479                 .rpc_resp       = &res,
2480                 .rpc_cred       = cred,
2481         };
2482         unsigned long timestamp = jiffies;
2483         fmode_t fmode;
2484         bool truncate;
2485         int status;
2486
2487         arg.bitmask = nfs4_bitmask(server, ilabel);
2488         if (ilabel)
2489                 arg.bitmask = nfs4_bitmask(server, olabel);
2490
2491         nfs_fattr_init(fattr);
2492
2493         /* Servers should only apply open mode checks for file size changes */
2494         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2495         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2496
2497         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2498                 /* Use that stateid */
2499         } else if (truncate && state != NULL) {
2500                 struct nfs_lockowner lockowner = {
2501                         .l_owner = current->files,
2502                         .l_pid = current->tgid,
2503                 };
2504                 if (!nfs4_valid_open_stateid(state))
2505                         return -EBADF;
2506                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2507                                 &lockowner) == -EIO)
2508                         return -EBADF;
2509         } else
2510                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2511
2512         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2513         if (status == 0 && state != NULL)
2514                 renew_lease(server, timestamp);
2515         return status;
2516 }
2517
2518 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2519                            struct nfs_fattr *fattr, struct iattr *sattr,
2520                            struct nfs4_state *state, struct nfs4_label *ilabel,
2521                            struct nfs4_label *olabel)
2522 {
2523         struct nfs_server *server = NFS_SERVER(inode);
2524         struct nfs4_exception exception = {
2525                 .state = state,
2526                 .inode = inode,
2527         };
2528         int err;
2529         do {
2530                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2531                 trace_nfs4_setattr(inode, err);
2532                 switch (err) {
2533                 case -NFS4ERR_OPENMODE:
2534                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2535                                 pr_warn_once("NFSv4: server %s is incorrectly "
2536                                                 "applying open mode checks to "
2537                                                 "a SETATTR that is not "
2538                                                 "changing file size.\n",
2539                                                 server->nfs_client->cl_hostname);
2540                         }
2541                         if (state && !(state->state & FMODE_WRITE)) {
2542                                 err = -EBADF;
2543                                 if (sattr->ia_valid & ATTR_OPEN)
2544                                         err = -EACCES;
2545                                 goto out;
2546                         }
2547                 }
2548                 err = nfs4_handle_exception(server, err, &exception);
2549         } while (exception.retry);
2550 out:
2551         return err;
2552 }
2553
2554 struct nfs4_closedata {
2555         struct inode *inode;
2556         struct nfs4_state *state;
2557         struct nfs_closeargs arg;
2558         struct nfs_closeres res;
2559         struct nfs_fattr fattr;
2560         unsigned long timestamp;
2561         bool roc;
2562         u32 roc_barrier;
2563 };
2564
2565 static void nfs4_free_closedata(void *data)
2566 {
2567         struct nfs4_closedata *calldata = data;
2568         struct nfs4_state_owner *sp = calldata->state->owner;
2569         struct super_block *sb = calldata->state->inode->i_sb;
2570
2571         if (calldata->roc)
2572                 pnfs_roc_release(calldata->state->inode);
2573         nfs4_put_open_state(calldata->state);
2574         nfs_free_seqid(calldata->arg.seqid);
2575         nfs4_put_state_owner(sp);
2576         nfs_sb_deactive(sb);
2577         kfree(calldata);
2578 }
2579
2580 static void nfs4_close_done(struct rpc_task *task, void *data)
2581 {
2582         struct nfs4_closedata *calldata = data;
2583         struct nfs4_state *state = calldata->state;
2584         struct nfs_server *server = NFS_SERVER(calldata->inode);
2585         nfs4_stateid *res_stateid = NULL;
2586
2587         dprintk("%s: begin!\n", __func__);
2588         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2589                 return;
2590         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2591         /* hmm. we are done with the inode, and in the process of freeing
2592          * the state_owner. we keep this around to process errors
2593          */
2594         switch (task->tk_status) {
2595                 case 0:
2596                         res_stateid = &calldata->res.stateid;
2597                         if (calldata->arg.fmode == 0 && calldata->roc)
2598                                 pnfs_roc_set_barrier(state->inode,
2599                                                      calldata->roc_barrier);
2600                         renew_lease(server, calldata->timestamp);
2601                         break;
2602                 case -NFS4ERR_ADMIN_REVOKED:
2603                 case -NFS4ERR_STALE_STATEID:
2604                 case -NFS4ERR_OLD_STATEID:
2605                 case -NFS4ERR_BAD_STATEID:
2606                 case -NFS4ERR_EXPIRED:
2607                         if (calldata->arg.fmode == 0)
2608                                 break;
2609                 default:
2610                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2611                                 rpc_restart_call_prepare(task);
2612                                 goto out_release;
2613                         }
2614         }
2615         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2616 out_release:
2617         nfs_release_seqid(calldata->arg.seqid);
2618         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2619         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2620 }
2621
2622 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2623 {
2624         struct nfs4_closedata *calldata = data;
2625         struct nfs4_state *state = calldata->state;
2626         struct inode *inode = calldata->inode;
2627         bool is_rdonly, is_wronly, is_rdwr;
2628         int call_close = 0;
2629
2630         dprintk("%s: begin!\n", __func__);
2631         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2632                 goto out_wait;
2633
2634         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2635         spin_lock(&state->owner->so_lock);
2636         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2637         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2638         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2639         /* Calculate the change in open mode */
2640         calldata->arg.fmode = 0;
2641         if (state->n_rdwr == 0) {
2642                 if (state->n_rdonly == 0)
2643                         call_close |= is_rdonly;
2644                 else if (is_rdonly)
2645                         calldata->arg.fmode |= FMODE_READ;
2646                 if (state->n_wronly == 0)
2647                         call_close |= is_wronly;
2648                 else if (is_wronly)
2649                         calldata->arg.fmode |= FMODE_WRITE;
2650         } else if (is_rdwr)
2651                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2652
2653         if (calldata->arg.fmode == 0)
2654                 call_close |= is_rdwr;
2655
2656         if (!nfs4_valid_open_stateid(state))
2657                 call_close = 0;
2658         spin_unlock(&state->owner->so_lock);
2659
2660         if (!call_close) {
2661                 /* Note: exit _without_ calling nfs4_close_done */
2662                 goto out_no_action;
2663         }
2664
2665         if (calldata->arg.fmode == 0) {
2666                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2667                 if (calldata->roc &&
2668                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2669                         nfs_release_seqid(calldata->arg.seqid);
2670                         goto out_wait;
2671                     }
2672         }
2673
2674         nfs_fattr_init(calldata->res.fattr);
2675         calldata->timestamp = jiffies;
2676         if (nfs4_setup_sequence(NFS_SERVER(inode),
2677                                 &calldata->arg.seq_args,
2678                                 &calldata->res.seq_res,
2679                                 task) != 0)
2680                 nfs_release_seqid(calldata->arg.seqid);
2681         dprintk("%s: done!\n", __func__);
2682         return;
2683 out_no_action:
2684         task->tk_action = NULL;
2685 out_wait:
2686         nfs4_sequence_done(task, &calldata->res.seq_res);
2687 }
2688
2689 static const struct rpc_call_ops nfs4_close_ops = {
2690         .rpc_call_prepare = nfs4_close_prepare,
2691         .rpc_call_done = nfs4_close_done,
2692         .rpc_release = nfs4_free_closedata,
2693 };
2694
2695 static bool nfs4_state_has_opener(struct nfs4_state *state)
2696 {
2697         /* first check existing openers */
2698         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2699             state->n_rdonly != 0)
2700                 return true;
2701
2702         if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2703             state->n_wronly != 0)
2704                 return true;
2705
2706         if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2707             state->n_rdwr != 0)
2708                 return true;
2709
2710         return false;
2711 }
2712
2713 static bool nfs4_roc(struct inode *inode)
2714 {
2715         struct nfs_inode *nfsi = NFS_I(inode);
2716         struct nfs_open_context *ctx;
2717         struct nfs4_state *state;
2718
2719         spin_lock(&inode->i_lock);
2720         list_for_each_entry(ctx, &nfsi->open_files, list) {
2721                 state = ctx->state;
2722                 if (state == NULL)
2723                         continue;
2724                 if (nfs4_state_has_opener(state)) {
2725                         spin_unlock(&inode->i_lock);
2726                         return false;
2727                 }
2728         }
2729         spin_unlock(&inode->i_lock);
2730
2731         if (nfs4_check_delegation(inode, FMODE_READ))
2732                 return false;
2733
2734         return pnfs_roc(inode);
2735 }
2736
2737 /*
2738  * It is possible for data to be read/written from a mem-mapped file
2739  * after the sys_close call (which hits the vfs layer as a flush).
2740  * This means that we can't safely call nfsv4 close on a file until
2741  * the inode is cleared. This in turn means that we are not good
2742  * NFSv4 citizens - we do not indicate to the server to update the file's
2743  * share state even when we are done with one of the three share
2744  * stateid's in the inode.
2745  *
2746  * NOTE: Caller must be holding the sp->so_owner semaphore!
2747  */
2748 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2749 {
2750         struct nfs_server *server = NFS_SERVER(state->inode);
2751         struct nfs4_closedata *calldata;
2752         struct nfs4_state_owner *sp = state->owner;
2753         struct rpc_task *task;
2754         struct rpc_message msg = {
2755                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2756                 .rpc_cred = state->owner->so_cred,
2757         };
2758         struct rpc_task_setup task_setup_data = {
2759                 .rpc_client = server->client,
2760                 .rpc_message = &msg,
2761                 .callback_ops = &nfs4_close_ops,
2762                 .workqueue = nfsiod_workqueue,
2763                 .flags = RPC_TASK_ASYNC,
2764         };
2765         int status = -ENOMEM;
2766
2767         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2768                 &task_setup_data.rpc_client, &msg);
2769
2770         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2771         if (calldata == NULL)
2772                 goto out;
2773         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2774         calldata->inode = state->inode;
2775         calldata->state = state;
2776         calldata->arg.fh = NFS_FH(state->inode);
2777         calldata->arg.stateid = &state->open_stateid;
2778         /* Serialization for the sequence id */
2779         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2780         if (calldata->arg.seqid == NULL)
2781                 goto out_free_calldata;
2782         calldata->arg.fmode = 0;
2783         calldata->arg.bitmask = server->cache_consistency_bitmask;
2784         calldata->res.fattr = &calldata->fattr;
2785         calldata->res.seqid = calldata->arg.seqid;
2786         calldata->res.server = server;
2787         calldata->roc = nfs4_roc(state->inode);
2788         nfs_sb_active(calldata->inode->i_sb);
2789
2790         msg.rpc_argp = &calldata->arg;
2791         msg.rpc_resp = &calldata->res;
2792         task_setup_data.callback_data = calldata;
2793         task = rpc_run_task(&task_setup_data);
2794         if (IS_ERR(task))
2795                 return PTR_ERR(task);
2796         status = 0;
2797         if (wait)
2798                 status = rpc_wait_for_completion_task(task);
2799         rpc_put_task(task);
2800         return status;
2801 out_free_calldata:
2802         kfree(calldata);
2803 out:
2804         nfs4_put_open_state(state);
2805         nfs4_put_state_owner(sp);
2806         return status;
2807 }
2808
2809 static struct inode *
2810 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2811                 int open_flags, struct iattr *attr, int *opened)
2812 {
2813         struct nfs4_state *state;
2814         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2815
2816         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2817
2818         /* Protect against concurrent sillydeletes */
2819         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2820
2821         nfs4_label_release_security(label);
2822
2823         if (IS_ERR(state))
2824                 return ERR_CAST(state);
2825         return state->inode;
2826 }
2827
2828 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2829 {
2830         if (ctx->state == NULL)
2831                 return;
2832         if (is_sync)
2833                 nfs4_close_sync(ctx->state, ctx->mode);
2834         else
2835                 nfs4_close_state(ctx->state, ctx->mode);
2836 }
2837
2838 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2839 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2840 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2841
2842 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2843 {
2844         struct nfs4_server_caps_arg args = {
2845                 .fhandle = fhandle,
2846         };
2847         struct nfs4_server_caps_res res = {};
2848         struct rpc_message msg = {
2849                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2850                 .rpc_argp = &args,
2851                 .rpc_resp = &res,
2852         };
2853         int status;
2854
2855         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2856         if (status == 0) {
2857                 /* Sanity check the server answers */
2858                 switch (server->nfs_client->cl_minorversion) {
2859                 case 0:
2860                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2861                         res.attr_bitmask[2] = 0;
2862                         break;
2863                 case 1:
2864                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2865                         break;
2866                 case 2:
2867                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2868                 }
2869                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2870                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2871                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2872                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2873                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2874                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2875                                 NFS_CAP_SECURITY_LABEL);
2876                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2877                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2878                         server->caps |= NFS_CAP_ACLS;
2879                 if (res.has_links != 0)
2880                         server->caps |= NFS_CAP_HARDLINKS;
2881                 if (res.has_symlinks != 0)
2882                         server->caps |= NFS_CAP_SYMLINKS;
2883                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2884                         server->caps |= NFS_CAP_FILEID;
2885                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2886                         server->caps |= NFS_CAP_MODE;
2887                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2888                         server->caps |= NFS_CAP_NLINK;
2889                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2890                         server->caps |= NFS_CAP_OWNER;
2891                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2892                         server->caps |= NFS_CAP_OWNER_GROUP;
2893                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2894                         server->caps |= NFS_CAP_ATIME;
2895                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2896                         server->caps |= NFS_CAP_CTIME;
2897                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2898                         server->caps |= NFS_CAP_MTIME;
2899 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2900                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2901                         server->caps |= NFS_CAP_SECURITY_LABEL;
2902 #endif
2903                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2904                                 sizeof(server->attr_bitmask));
2905                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2906
2907                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2908                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2909                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2910                 server->cache_consistency_bitmask[2] = 0;
2911                 server->acl_bitmask = res.acl_bitmask;
2912                 server->fh_expire_type = res.fh_expire_type;
2913         }
2914
2915         return status;
2916 }
2917
2918 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2919 {
2920         struct nfs4_exception exception = { };
2921         int err;
2922         do {
2923                 err = nfs4_handle_exception(server,
2924                                 _nfs4_server_capabilities(server, fhandle),
2925                                 &exception);
2926         } while (exception.retry);
2927         return err;
2928 }
2929
2930 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2931                 struct nfs_fsinfo *info)
2932 {
2933         u32 bitmask[3];
2934         struct nfs4_lookup_root_arg args = {
2935                 .bitmask = bitmask,
2936         };
2937         struct nfs4_lookup_res res = {
2938                 .server = server,
2939                 .fattr = info->fattr,
2940                 .fh = fhandle,
2941         };
2942         struct rpc_message msg = {
2943                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2944                 .rpc_argp = &args,
2945                 .rpc_resp = &res,
2946         };
2947
2948         bitmask[0] = nfs4_fattr_bitmap[0];
2949         bitmask[1] = nfs4_fattr_bitmap[1];
2950         /*
2951          * Process the label in the upcoming getfattr
2952          */
2953         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2954
2955         nfs_fattr_init(info->fattr);
2956         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2957 }
2958
2959 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2960                 struct nfs_fsinfo *info)
2961 {
2962         struct nfs4_exception exception = { };
2963         int err;
2964         do {
2965                 err = _nfs4_lookup_root(server, fhandle, info);
2966                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2967                 switch (err) {
2968                 case 0:
2969                 case -NFS4ERR_WRONGSEC:
2970                         goto out;
2971                 default:
2972                         err = nfs4_handle_exception(server, err, &exception);
2973                 }
2974         } while (exception.retry);
2975 out:
2976         return err;
2977 }
2978
2979 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2980                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2981 {
2982         struct rpc_auth_create_args auth_args = {
2983                 .pseudoflavor = flavor,
2984         };
2985         struct rpc_auth *auth;
2986         int ret;
2987
2988         auth = rpcauth_create(&auth_args, server->client);
2989         if (IS_ERR(auth)) {
2990                 ret = -EACCES;
2991                 goto out;
2992         }
2993         ret = nfs4_lookup_root(server, fhandle, info);
2994 out:
2995         return ret;
2996 }
2997
2998 /*
2999  * Retry pseudoroot lookup with various security flavors.  We do this when:
3000  *
3001  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3002  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3003  *
3004  * Returns zero on success, or a negative NFS4ERR value, or a
3005  * negative errno value.
3006  */
3007 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3008                               struct nfs_fsinfo *info)
3009 {
3010         /* Per 3530bis 15.33.5 */
3011         static const rpc_authflavor_t flav_array[] = {
3012                 RPC_AUTH_GSS_KRB5P,
3013                 RPC_AUTH_GSS_KRB5I,
3014                 RPC_AUTH_GSS_KRB5,
3015                 RPC_AUTH_UNIX,                  /* courtesy */
3016                 RPC_AUTH_NULL,
3017         };
3018         int status = -EPERM;
3019         size_t i;
3020
3021         if (server->auth_info.flavor_len > 0) {
3022                 /* try each flavor specified by user */
3023                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3024                         status = nfs4_lookup_root_sec(server, fhandle, info,
3025                                                 server->auth_info.flavors[i]);
3026                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3027                                 continue;
3028                         break;
3029                 }
3030         } else {
3031                 /* no flavors specified by user, try default list */
3032                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3033                         status = nfs4_lookup_root_sec(server, fhandle, info,
3034                                                       flav_array[i]);
3035                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3036                                 continue;
3037                         break;
3038                 }
3039         }
3040
3041         /*
3042          * -EACCESS could mean that the user doesn't have correct permissions
3043          * to access the mount.  It could also mean that we tried to mount
3044          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3045          * existing mount programs don't handle -EACCES very well so it should
3046          * be mapped to -EPERM instead.
3047          */
3048         if (status == -EACCES)
3049                 status = -EPERM;
3050         return status;
3051 }
3052
3053 static int nfs4_do_find_root_sec(struct nfs_server *server,
3054                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3055 {
3056         int mv = server->nfs_client->cl_minorversion;
3057         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3058 }
3059
3060 /**
3061  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3062  * @server: initialized nfs_server handle
3063  * @fhandle: we fill in the pseudo-fs root file handle
3064  * @info: we fill in an FSINFO struct
3065  * @auth_probe: probe the auth flavours
3066  *
3067  * Returns zero on success, or a negative errno.
3068  */
3069 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3070                          struct nfs_fsinfo *info,
3071                          bool auth_probe)
3072 {
3073         int status;
3074
3075         switch (auth_probe) {
3076         case false:
3077                 status = nfs4_lookup_root(server, fhandle, info);
3078                 if (status != -NFS4ERR_WRONGSEC)
3079                         break;
3080         default:
3081                 status = nfs4_do_find_root_sec(server, fhandle, info);
3082         }
3083
3084         if (status == 0)
3085                 status = nfs4_server_capabilities(server, fhandle);
3086         if (status == 0)
3087                 status = nfs4_do_fsinfo(server, fhandle, info);
3088
3089         return nfs4_map_errors(status);
3090 }
3091
3092 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3093                               struct nfs_fsinfo *info)
3094 {
3095         int error;
3096         struct nfs_fattr *fattr = info->fattr;
3097         struct nfs4_label *label = NULL;
3098
3099         error = nfs4_server_capabilities(server, mntfh);
3100         if (error < 0) {
3101                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3102                 return error;
3103         }
3104
3105         label = nfs4_label_alloc(server, GFP_KERNEL);
3106         if (IS_ERR(label))
3107                 return PTR_ERR(label);
3108
3109         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3110         if (error < 0) {
3111                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3112                 goto err_free_label;
3113         }
3114
3115         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3116             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3117                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3118
3119 err_free_label:
3120         nfs4_label_free(label);
3121
3122         return error;
3123 }
3124
3125 /*
3126  * Get locations and (maybe) other attributes of a referral.
3127  * Note that we'll actually follow the referral later when
3128  * we detect fsid mismatch in inode revalidation
3129  */
3130 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3131                              const struct qstr *name, struct nfs_fattr *fattr,
3132                              struct nfs_fh *fhandle)
3133 {
3134         int status = -ENOMEM;
3135         struct page *page = NULL;
3136         struct nfs4_fs_locations *locations = NULL;
3137
3138         page = alloc_page(GFP_KERNEL);
3139         if (page == NULL)
3140                 goto out;
3141         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3142         if (locations == NULL)
3143                 goto out;
3144
3145         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3146         if (status != 0)
3147                 goto out;
3148
3149         /*
3150          * If the fsid didn't change, this is a migration event, not a
3151          * referral.  Cause us to drop into the exception handler, which
3152          * will kick off migration recovery.
3153          */
3154         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3155                 dprintk("%s: server did not return a different fsid for"
3156                         " a referral at %s\n", __func__, name->name);
3157                 status = -NFS4ERR_MOVED;
3158                 goto out;
3159         }
3160         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3161         nfs_fixup_referral_attributes(&locations->fattr);
3162
3163         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3164         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3165         memset(fhandle, 0, sizeof(struct nfs_fh));
3166 out:
3167         if (page)
3168                 __free_page(page);
3169         kfree(locations);
3170         return status;
3171 }
3172
3173 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3174                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3175 {
3176         struct nfs4_getattr_arg args = {
3177                 .fh = fhandle,
3178                 .bitmask = server->attr_bitmask,
3179         };
3180         struct nfs4_getattr_res res = {
3181                 .fattr = fattr,
3182                 .label = label,
3183                 .server = server,
3184         };
3185         struct rpc_message msg = {
3186                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3187                 .rpc_argp = &args,
3188                 .rpc_resp = &res,
3189         };
3190
3191         args.bitmask = nfs4_bitmask(server, label);
3192
3193         nfs_fattr_init(fattr);
3194         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3195 }
3196
3197 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3198                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3199 {
3200         struct nfs4_exception exception = { };
3201         int err;
3202         do {
3203                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3204                 trace_nfs4_getattr(server, fhandle, fattr, err);
3205                 err = nfs4_handle_exception(server, err,
3206                                 &exception);
3207         } while (exception.retry);
3208         return err;
3209 }
3210
3211 /*
3212  * The file is not closed if it is opened due to the a request to change
3213  * the size of the file. The open call will not be needed once the
3214  * VFS layer lookup-intents are implemented.
3215  *
3216  * Close is called when the inode is destroyed.
3217  * If we haven't opened the file for O_WRONLY, we
3218  * need to in the size_change case to obtain a stateid.
3219  *
3220  * Got race?
3221  * Because OPEN is always done by name in nfsv4, it is
3222  * possible that we opened a different file by the same
3223  * name.  We can recognize this race condition, but we
3224  * can't do anything about it besides returning an error.
3225  *
3226  * This will be fixed with VFS changes (lookup-intent).
3227  */
3228 static int
3229 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3230                   struct iattr *sattr)
3231 {
3232         struct inode *inode = dentry->d_inode;
3233         struct rpc_cred *cred = NULL;
3234         struct nfs4_state *state = NULL;
3235         struct nfs4_label *label = NULL;
3236         int status;
3237
3238         if (pnfs_ld_layoutret_on_setattr(inode) &&
3239             sattr->ia_valid & ATTR_SIZE &&
3240             sattr->ia_size < i_size_read(inode))
3241                 pnfs_commit_and_return_layout(inode);
3242
3243         nfs_fattr_init(fattr);
3244
3245         /* Deal with open(O_TRUNC) */
3246         if (sattr->ia_valid & ATTR_OPEN)
3247                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3248
3249         /* Optimization: if the end result is no change, don't RPC */
3250         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3251                 return 0;
3252
3253         /* Search for an existing open(O_WRITE) file */
3254         if (sattr->ia_valid & ATTR_FILE) {
3255                 struct nfs_open_context *ctx;
3256
3257                 ctx = nfs_file_open_context(sattr->ia_file);
3258                 if (ctx) {
3259                         cred = ctx->cred;
3260                         state = ctx->state;
3261                 }
3262         }
3263
3264         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3265         if (IS_ERR(label))
3266                 return PTR_ERR(label);
3267
3268         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3269         if (status == 0) {
3270                 nfs_setattr_update_inode(inode, sattr);
3271                 nfs_setsecurity(inode, fattr, label);
3272         }
3273         nfs4_label_free(label);
3274         return status;
3275 }
3276
3277 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3278                 const struct qstr *name, struct nfs_fh *fhandle,
3279                 struct nfs_fattr *fattr, struct nfs4_label *label)
3280 {
3281         struct nfs_server *server = NFS_SERVER(dir);
3282         int                    status;
3283         struct nfs4_lookup_arg args = {
3284                 .bitmask = server->attr_bitmask,
3285                 .dir_fh = NFS_FH(dir),
3286                 .name = name,
3287         };
3288         struct nfs4_lookup_res res = {
3289                 .server = server,
3290                 .fattr = fattr,
3291                 .label = label,
3292                 .fh = fhandle,
3293         };
3294         struct rpc_message msg = {
3295                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3296                 .rpc_argp = &args,
3297                 .rpc_resp = &res,
3298         };
3299
3300         args.bitmask = nfs4_bitmask(server, label);
3301
3302         nfs_fattr_init(fattr);
3303
3304         dprintk("NFS call  lookup %s\n", name->name);
3305         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3306         dprintk("NFS reply lookup: %d\n", status);
3307         return status;
3308 }
3309
3310 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3311 {
3312         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3313                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3314         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3315         fattr->nlink = 2;
3316 }
3317
3318 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3319                                    struct qstr *name, struct nfs_fh *fhandle,
3320                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3321 {
3322         struct nfs4_exception exception = { };
3323         struct rpc_clnt *client = *clnt;
3324         int err;
3325         do {
3326                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3327                 trace_nfs4_lookup(dir, name, err);
3328                 switch (err) {
3329                 case -NFS4ERR_BADNAME:
3330                         err = -ENOENT;
3331                         goto out;
3332                 case -NFS4ERR_MOVED:
3333                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3334                         goto out;
3335                 case -NFS4ERR_WRONGSEC:
3336                         err = -EPERM;
3337                         if (client != *clnt)
3338                                 goto out;
3339                         client = nfs4_negotiate_security(client, dir, name);
3340                         if (IS_ERR(client))
3341                                 return PTR_ERR(client);
3342
3343                         exception.retry = 1;
3344                         break;
3345                 default:
3346                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3347                 }
3348         } while (exception.retry);
3349
3350 out:
3351         if (err == 0)
3352                 *clnt = client;
3353         else if (client != *clnt)
3354                 rpc_shutdown_client(client);
3355
3356         return err;
3357 }
3358
3359 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3360                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3361                             struct nfs4_label *label)
3362 {
3363         int status;
3364         struct rpc_clnt *client = NFS_CLIENT(dir);
3365
3366         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3367         if (client != NFS_CLIENT(dir)) {
3368                 rpc_shutdown_client(client);
3369                 nfs_fixup_secinfo_attributes(fattr);
3370         }
3371         return status;
3372 }
3373
3374 struct rpc_clnt *
3375 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3376                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3377 {
3378         struct rpc_clnt *client = NFS_CLIENT(dir);
3379         int status;
3380
3381         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3382         if (status < 0)
3383                 return ERR_PTR(status);
3384         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3385 }
3386
3387 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3388 {
3389         struct nfs_server *server = NFS_SERVER(inode);
3390         struct nfs4_accessargs args = {
3391                 .fh = NFS_FH(inode),
3392                 .bitmask = server->cache_consistency_bitmask,
3393         };
3394         struct nfs4_accessres res = {
3395                 .server = server,
3396         };
3397         struct rpc_message msg = {
3398                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3399                 .rpc_argp = &args,
3400                 .rpc_resp = &res,
3401                 .rpc_cred = entry->cred,
3402         };
3403         int mode = entry->mask;
3404         int status = 0;
3405
3406         /*
3407          * Determine which access bits we want to ask for...
3408          */
3409         if (mode & MAY_READ)
3410                 args.access |= NFS4_ACCESS_READ;
3411         if (S_ISDIR(inode->i_mode)) {
3412                 if (mode & MAY_WRITE)
3413                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3414                 if (mode & MAY_EXEC)
3415                         args.access |= NFS4_ACCESS_LOOKUP;
3416         } else {
3417                 if (mode & MAY_WRITE)
3418                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3419                 if (mode & MAY_EXEC)
3420                         args.access |= NFS4_ACCESS_EXECUTE;
3421         }
3422
3423         res.fattr = nfs_alloc_fattr();
3424         if (res.fattr == NULL)
3425                 return -ENOMEM;
3426
3427         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3428         if (!status) {
3429                 nfs_access_set_mask(entry, res.access);
3430                 nfs_refresh_inode(inode, res.fattr);
3431         }
3432         nfs_free_fattr(res.fattr);
3433         return status;
3434 }
3435
3436 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3437 {
3438         struct nfs4_exception exception = { };
3439         int err;
3440         do {
3441                 err = _nfs4_proc_access(inode, entry);
3442                 trace_nfs4_access(inode, err);
3443                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3444                                 &exception);
3445         } while (exception.retry);
3446         return err;
3447 }
3448
3449 /*
3450  * TODO: For the time being, we don't try to get any attributes
3451  * along with any of the zero-copy operations READ, READDIR,
3452  * READLINK, WRITE.
3453  *
3454  * In the case of the first three, we want to put the GETATTR
3455  * after the read-type operation -- this is because it is hard
3456  * to predict the length of a GETATTR response in v4, and thus
3457  * align the READ data correctly.  This means that the GETATTR
3458  * may end up partially falling into the page cache, and we should
3459  * shift it into the 'tail' of the xdr_buf before processing.
3460  * To do this efficiently, we need to know the total length
3461  * of data received, which doesn't seem to be available outside
3462  * of the RPC layer.
3463  *
3464  * In the case of WRITE, we also want to put the GETATTR after
3465  * the operation -- in this case because we want to make sure
3466  * we get the post-operation mtime and size.
3467  *
3468  * Both of these changes to the XDR layer would in fact be quite
3469  * minor, but I decided to leave them for a subsequent patch.
3470  */
3471 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3472                 unsigned int pgbase, unsigned int pglen)
3473 {
3474         struct nfs4_readlink args = {
3475                 .fh       = NFS_FH(inode),
3476                 .pgbase   = pgbase,
3477                 .pglen    = pglen,
3478                 .pages    = &page,
3479         };
3480         struct nfs4_readlink_res res;
3481         struct rpc_message msg = {
3482                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3483                 .rpc_argp = &args,
3484                 .rpc_resp = &res,
3485         };
3486
3487         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3488 }
3489
3490 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3491                 unsigned int pgbase, unsigned int pglen)
3492 {
3493         struct nfs4_exception exception = { };
3494         int err;
3495         do {
3496                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3497                 trace_nfs4_readlink(inode, err);
3498                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3499                                 &exception);
3500         } while (exception.retry);
3501         return err;
3502 }
3503
3504 /*
3505  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3506  */
3507 static int
3508 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3509                  int flags)
3510 {
3511         struct nfs4_label l, *ilabel = NULL;
3512         struct nfs_open_context *ctx;
3513         struct nfs4_state *state;
3514         int opened = 0;
3515         int status = 0;
3516
3517         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3518         if (IS_ERR(ctx))
3519                 return PTR_ERR(ctx);
3520
3521         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3522
3523         sattr->ia_mode &= ~current_umask();
3524         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3525         if (IS_ERR(state)) {
3526                 status = PTR_ERR(state);
3527                 goto out;
3528         }
3529 out:
3530         nfs4_label_release_security(ilabel);
3531         put_nfs_open_context(ctx);
3532         return status;
3533 }
3534
3535 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3536 {
3537         struct nfs_server *server = NFS_SERVER(dir);
3538         struct nfs_removeargs args = {
3539                 .fh = NFS_FH(dir),
3540                 .name = *name,
3541         };
3542         struct nfs_removeres res = {
3543                 .server = server,
3544         };
3545         struct rpc_message msg = {
3546                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3547                 .rpc_argp = &args,
3548                 .rpc_resp = &res,
3549         };
3550         int status;
3551
3552         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3553         if (status == 0)
3554                 update_changeattr(dir, &res.cinfo);
3555         return status;
3556 }
3557
3558 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3559 {
3560         struct nfs4_exception exception = { };
3561         int err;
3562         do {
3563                 err = _nfs4_proc_remove(dir, name);
3564                 trace_nfs4_remove(dir, name, err);
3565                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3566                                 &exception);
3567         } while (exception.retry);
3568         return err;
3569 }
3570
3571 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3572 {
3573         struct nfs_server *server = NFS_SERVER(dir);
3574         struct nfs_removeargs *args = msg->rpc_argp;
3575         struct nfs_removeres *res = msg->rpc_resp;
3576
3577         res->server = server;
3578         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3579         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3580
3581         nfs_fattr_init(res->dir_attr);
3582 }
3583
3584 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3585 {
3586         nfs4_setup_sequence(NFS_SERVER(data->dir),
3587                         &data->args.seq_args,
3588                         &data->res.seq_res,
3589                         task);
3590 }
3591
3592 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3593 {
3594         struct nfs_unlinkdata *data = task->tk_calldata;
3595         struct nfs_removeres *res = &data->res;
3596
3597         if (!nfs4_sequence_done(task, &res->seq_res))
3598                 return 0;
3599         if (nfs4_async_handle_error(task, res->server, NULL,
3600                                     &data->timeout) == -EAGAIN)
3601                 return 0;
3602         update_changeattr(dir, &res->cinfo);
3603         return 1;
3604 }
3605
3606 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3607 {
3608         struct nfs_server *server = NFS_SERVER(dir);
3609         struct nfs_renameargs *arg = msg->rpc_argp;
3610         struct nfs_renameres *res = msg->rpc_resp;
3611
3612         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3613         res->server = server;
3614         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3615 }
3616
3617 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3618 {
3619         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3620                         &data->args.seq_args,
3621                         &data->res.seq_res,
3622                         task);
3623 }
3624
3625 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3626                                  struct inode *new_dir)
3627 {
3628         struct nfs_renamedata *data = task->tk_calldata;
3629         struct nfs_renameres *res = &data->res;
3630
3631         if (!nfs4_sequence_done(task, &res->seq_res))
3632                 return 0;
3633         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3634                 return 0;
3635
3636         update_changeattr(old_dir, &res->old_cinfo);
3637         update_changeattr(new_dir, &res->new_cinfo);
3638         return 1;
3639 }
3640
3641 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3642 {
3643         struct nfs_server *server = NFS_SERVER(inode);
3644         struct nfs4_link_arg arg = {
3645                 .fh     = NFS_FH(inode),
3646                 .dir_fh = NFS_FH(dir),
3647                 .name   = name,
3648                 .bitmask = server->attr_bitmask,
3649         };
3650         struct nfs4_link_res res = {
3651                 .server = server,
3652                 .label = NULL,
3653         };
3654         struct rpc_message msg = {
3655                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3656                 .rpc_argp = &arg,
3657                 .rpc_resp = &res,
3658         };
3659         int status = -ENOMEM;
3660
3661         res.fattr = nfs_alloc_fattr();
3662         if (res.fattr == NULL)
3663                 goto out;
3664
3665         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3666         if (IS_ERR(res.label)) {
3667                 status = PTR_ERR(res.label);
3668                 goto out;
3669         }
3670         arg.bitmask = nfs4_bitmask(server, res.label);
3671
3672         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3673         if (!status) {
3674                 update_changeattr(dir, &res.cinfo);
3675                 status = nfs_post_op_update_inode(inode, res.fattr);
3676                 if (!status)
3677                         nfs_setsecurity(inode, res.fattr, res.label);
3678         }
3679
3680
3681         nfs4_label_free(res.label);
3682
3683 out:
3684         nfs_free_fattr(res.fattr);
3685         return status;
3686 }
3687
3688 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3689 {
3690         struct nfs4_exception exception = { };
3691         int err;
3692         do {
3693                 err = nfs4_handle_exception(NFS_SERVER(inode),
3694                                 _nfs4_proc_link(inode, dir, name),
3695                                 &exception);
3696         } while (exception.retry);
3697         return err;
3698 }
3699
3700 struct nfs4_createdata {
3701         struct rpc_message msg;
3702         struct nfs4_create_arg arg;
3703         struct nfs4_create_res res;
3704         struct nfs_fh fh;
3705         struct nfs_fattr fattr;
3706         struct nfs4_label *label;
3707 };
3708
3709 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3710                 struct qstr *name, struct iattr *sattr, u32 ftype)
3711 {
3712         struct nfs4_createdata *data;
3713
3714         data = kzalloc(sizeof(*data), GFP_KERNEL);
3715         if (data != NULL) {
3716                 struct nfs_server *server = NFS_SERVER(dir);
3717
3718                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3719                 if (IS_ERR(data->label))
3720                         goto out_free;
3721
3722                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3723                 data->msg.rpc_argp = &data->arg;
3724                 data->msg.rpc_resp = &data->res;
3725                 data->arg.dir_fh = NFS_FH(dir);
3726                 data->arg.server = server;
3727                 data->arg.name = name;
3728                 data->arg.attrs = sattr;
3729                 data->arg.ftype = ftype;
3730                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3731                 data->res.server = server;
3732                 data->res.fh = &data->fh;
3733                 data->res.fattr = &data->fattr;
3734                 data->res.label = data->label;
3735                 nfs_fattr_init(data->res.fattr);
3736         }
3737         return data;
3738 out_free:
3739         kfree(data);
3740         return NULL;
3741 }
3742
3743 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3744 {
3745         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3746                                     &data->arg.seq_args, &data->res.seq_res, 1);
3747         if (status == 0) {
3748                 update_changeattr(dir, &data->res.dir_cinfo);
3749                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3750         }
3751         return status;
3752 }
3753
3754 static void nfs4_free_createdata(struct nfs4_createdata *data)
3755 {
3756         nfs4_label_free(data->label);
3757         kfree(data);
3758 }
3759
3760 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3761                 struct page *page, unsigned int len, struct iattr *sattr,
3762                 struct nfs4_label *label)
3763 {
3764         struct nfs4_createdata *data;
3765         int status = -ENAMETOOLONG;
3766
3767         if (len > NFS4_MAXPATHLEN)
3768                 goto out;
3769
3770         status = -ENOMEM;
3771         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3772         if (data == NULL)
3773                 goto out;
3774
3775         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3776         data->arg.u.symlink.pages = &page;
3777         data->arg.u.symlink.len = len;
3778         data->arg.label = label;
3779
3780         status = nfs4_do_create(dir, dentry, data);
3781
3782         nfs4_free_createdata(data);
3783 out:
3784         return status;
3785 }
3786
3787 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3788                 struct page *page, unsigned int len, struct iattr *sattr)
3789 {
3790         struct nfs4_exception exception = { };
3791         struct nfs4_label l, *label = NULL;
3792         int err;
3793
3794         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3795
3796         do {
3797                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3798                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3799                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3800                                 &exception);
3801         } while (exception.retry);
3802
3803         nfs4_label_release_security(label);
3804         return err;
3805 }
3806
3807 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3808                 struct iattr *sattr, struct nfs4_label *label)
3809 {
3810         struct nfs4_createdata *data;
3811         int status = -ENOMEM;
3812
3813         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3814         if (data == NULL)
3815                 goto out;
3816
3817         data->arg.label = label;
3818         status = nfs4_do_create(dir, dentry, data);
3819
3820         nfs4_free_createdata(data);
3821 out:
3822         return status;
3823 }
3824
3825 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3826                 struct iattr *sattr)
3827 {
3828         struct nfs4_exception exception = { };
3829         struct nfs4_label l, *label = NULL;
3830         int err;
3831
3832         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3833
3834         sattr->ia_mode &= ~current_umask();
3835         do {
3836                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3837                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3838                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3839                                 &exception);
3840         } while (exception.retry);
3841         nfs4_label_release_security(label);
3842
3843         return err;
3844 }
3845
3846 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3847                 u64 cookie, struct page **pages, unsigned int count, int plus)
3848 {
3849         struct inode            *dir = dentry->d_inode;
3850         struct nfs4_readdir_arg args = {
3851                 .fh = NFS_FH(dir),
3852                 .pages = pages,
3853                 .pgbase = 0,
3854                 .count = count,
3855                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3856                 .plus = plus,
3857         };
3858         struct nfs4_readdir_res res;
3859         struct rpc_message msg = {
3860                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3861                 .rpc_argp = &args,
3862                 .rpc_resp = &res,
3863                 .rpc_cred = cred,
3864         };
3865         int                     status;
3866
3867         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3868                         dentry,
3869                         (unsigned long long)cookie);
3870         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3871         res.pgbase = args.pgbase;
3872         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3873         if (status >= 0) {
3874                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3875                 status += args.pgbase;
3876         }
3877
3878         nfs_invalidate_atime(dir);
3879
3880         dprintk("%s: returns %d\n", __func__, status);
3881         return status;
3882 }
3883
3884 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3885                 u64 cookie, struct page **pages, unsigned int count, int plus)
3886 {
3887         struct nfs4_exception exception = { };
3888         int err;
3889         do {
3890                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3891                                 pages, count, plus);
3892                 trace_nfs4_readdir(dentry->d_inode, err);
3893                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3894                                 &exception);
3895         } while (exception.retry);
3896         return err;
3897 }
3898
3899 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3900                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3901 {
3902         struct nfs4_createdata *data;
3903         int mode = sattr->ia_mode;
3904         int status = -ENOMEM;
3905
3906         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3907         if (data == NULL)
3908                 goto out;
3909
3910         if (S_ISFIFO(mode))
3911                 data->arg.ftype = NF4FIFO;
3912         else if (S_ISBLK(mode)) {
3913                 data->arg.ftype = NF4BLK;
3914                 data->arg.u.device.specdata1 = MAJOR(rdev);
3915                 data->arg.u.device.specdata2 = MINOR(rdev);
3916         }
3917         else if (S_ISCHR(mode)) {
3918                 data->arg.ftype = NF4CHR;
3919                 data->arg.u.device.specdata1 = MAJOR(rdev);
3920                 data->arg.u.device.specdata2 = MINOR(rdev);
3921         } else if (!S_ISSOCK(mode)) {
3922                 status = -EINVAL;
3923                 goto out_free;
3924         }
3925
3926         data->arg.label = label;
3927         status = nfs4_do_create(dir, dentry, data);
3928 out_free:
3929         nfs4_free_createdata(data);
3930 out:
3931         return status;
3932 }
3933
3934 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3935                 struct iattr *sattr, dev_t rdev)
3936 {
3937         struct nfs4_exception exception = { };
3938         struct nfs4_label l, *label = NULL;
3939         int err;
3940
3941         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3942
3943         sattr->ia_mode &= ~current_umask();
3944         do {
3945                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3946                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3947                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3948                                 &exception);
3949         } while (exception.retry);
3950
3951         nfs4_label_release_security(label);
3952
3953         return err;
3954 }
3955
3956 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3957                  struct nfs_fsstat *fsstat)
3958 {
3959         struct nfs4_statfs_arg args = {
3960                 .fh = fhandle,
3961                 .bitmask = server->attr_bitmask,
3962         };
3963         struct nfs4_statfs_res res = {
3964                 .fsstat = fsstat,
3965         };
3966         struct rpc_message msg = {
3967                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3968                 .rpc_argp = &args,
3969                 .rpc_resp = &res,
3970         };
3971
3972         nfs_fattr_init(fsstat->fattr);
3973         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3974 }
3975
3976 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3977 {
3978         struct nfs4_exception exception = { };
3979         int err;
3980         do {
3981                 err = nfs4_handle_exception(server,
3982                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3983                                 &exception);
3984         } while (exception.retry);
3985         return err;
3986 }
3987
3988 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3989                 struct nfs_fsinfo *fsinfo)
3990 {
3991         struct nfs4_fsinfo_arg args = {
3992                 .fh = fhandle,
3993                 .bitmask = server->attr_bitmask,
3994         };
3995         struct nfs4_fsinfo_res res = {
3996                 .fsinfo = fsinfo,
3997         };
3998         struct rpc_message msg = {
3999                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4000                 .rpc_argp = &args,
4001                 .rpc_resp = &res,
4002         };
4003
4004         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4005 }
4006
4007 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4008 {
4009         struct nfs4_exception exception = { };
4010         unsigned long now = jiffies;
4011         int err;
4012
4013         do {
4014                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4015                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4016                 if (err == 0) {
4017                         struct nfs_client *clp = server->nfs_client;
4018
4019                         spin_lock(&clp->cl_lock);
4020                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4021                         clp->cl_last_renewal = now;
4022                         spin_unlock(&clp->cl_lock);
4023                         break;
4024                 }
4025                 err = nfs4_handle_exception(server, err, &exception);
4026         } while (exception.retry);
4027         return err;
4028 }
4029
4030 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4031 {
4032         int error;
4033
4034         nfs_fattr_init(fsinfo->fattr);
4035         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4036         if (error == 0) {
4037                 /* block layout checks this! */
4038                 server->pnfs_blksize = fsinfo->blksize;
4039                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4040         }
4041
4042         return error;
4043 }
4044
4045 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4046                 struct nfs_pathconf *pathconf)
4047 {
4048         struct nfs4_pathconf_arg args = {
4049                 .fh = fhandle,
4050                 .bitmask = server->attr_bitmask,
4051         };
4052         struct nfs4_pathconf_res res = {
4053                 .pathconf = pathconf,
4054         };
4055         struct rpc_message msg = {
4056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4057                 .rpc_argp = &args,
4058                 .rpc_resp = &res,
4059         };
4060
4061         /* None of the pathconf attributes are mandatory to implement */
4062         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4063                 memset(pathconf, 0, sizeof(*pathconf));
4064                 return 0;
4065         }
4066
4067         nfs_fattr_init(pathconf->fattr);
4068         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4069 }
4070
4071 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4072                 struct nfs_pathconf *pathconf)
4073 {
4074         struct nfs4_exception exception = { };
4075         int err;
4076
4077         do {
4078                 err = nfs4_handle_exception(server,
4079                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4080                                 &exception);
4081         } while (exception.retry);
4082         return err;
4083 }
4084
4085 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4086                 const struct nfs_open_context *ctx,
4087                 const struct nfs_lock_context *l_ctx,
4088                 fmode_t fmode)
4089 {
4090         const struct nfs_lockowner *lockowner = NULL;
4091
4092         if (l_ctx != NULL)
4093                 lockowner = &l_ctx->lockowner;
4094         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4095 }
4096 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4097
4098 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4099                 const struct nfs_open_context *ctx,
4100                 const struct nfs_lock_context *l_ctx,
4101                 fmode_t fmode)
4102 {
4103         nfs4_stateid current_stateid;
4104
4105         /* If the current stateid represents a lost lock, then exit */
4106         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4107                 return true;
4108         return nfs4_stateid_match(stateid, &current_stateid);
4109 }
4110
4111 static bool nfs4_error_stateid_expired(int err)
4112 {
4113         switch (err) {
4114         case -NFS4ERR_DELEG_REVOKED:
4115         case -NFS4ERR_ADMIN_REVOKED:
4116         case -NFS4ERR_BAD_STATEID:
4117         case -NFS4ERR_STALE_STATEID:
4118         case -NFS4ERR_OLD_STATEID:
4119         case -NFS4ERR_OPENMODE:
4120         case -NFS4ERR_EXPIRED:
4121                 return true;
4122         }
4123         return false;
4124 }
4125
4126 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4127 {
4128         nfs_invalidate_atime(hdr->inode);
4129 }
4130
4131 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4132 {
4133         struct nfs_server *server = NFS_SERVER(hdr->inode);
4134
4135         trace_nfs4_read(hdr, task->tk_status);
4136         if (nfs4_async_handle_error(task, server,
4137                                     hdr->args.context->state,
4138                                     NULL) == -EAGAIN) {
4139                 rpc_restart_call_prepare(task);
4140                 return -EAGAIN;
4141         }
4142
4143         __nfs4_read_done_cb(hdr);
4144         if (task->tk_status > 0)
4145                 renew_lease(server, hdr->timestamp);
4146         return 0;
4147 }
4148
4149 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4150                 struct nfs_pgio_args *args)
4151 {
4152
4153         if (!nfs4_error_stateid_expired(task->tk_status) ||
4154                 nfs4_stateid_is_current(&args->stateid,
4155                                 args->context,
4156                                 args->lock_context,
4157                                 FMODE_READ))
4158                 return false;
4159         rpc_restart_call_prepare(task);
4160         return true;
4161 }
4162
4163 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4164 {
4165
4166         dprintk("--> %s\n", __func__);
4167
4168         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4169                 return -EAGAIN;
4170         if (nfs4_read_stateid_changed(task, &hdr->args))
4171                 return -EAGAIN;
4172         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4173                                     nfs4_read_done_cb(task, hdr);
4174 }
4175
4176 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4177                                  struct rpc_message *msg)
4178 {
4179         hdr->timestamp   = jiffies;
4180         hdr->pgio_done_cb = nfs4_read_done_cb;
4181         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4182         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4183 }
4184
4185 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4186                                       struct nfs_pgio_header *hdr)
4187 {
4188         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4189                         &hdr->args.seq_args,
4190                         &hdr->res.seq_res,
4191                         task))
4192                 return 0;
4193         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4194                                 hdr->args.lock_context,
4195                                 hdr->rw_ops->rw_mode) == -EIO)
4196                 return -EIO;
4197         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4198                 return -EIO;
4199         return 0;
4200 }
4201
4202 static int nfs4_write_done_cb(struct rpc_task *task,
4203                               struct nfs_pgio_header *hdr)
4204 {
4205         struct inode *inode = hdr->inode;
4206
4207         trace_nfs4_write(hdr, task->tk_status);
4208         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4209                                     hdr->args.context->state,
4210                                     NULL) == -EAGAIN) {
4211                 rpc_restart_call_prepare(task);
4212                 return -EAGAIN;
4213         }
4214         if (task->tk_status >= 0) {
4215                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4216                 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4217         }
4218         return 0;
4219 }
4220
4221 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4222                 struct nfs_pgio_args *args)
4223 {
4224
4225         if (!nfs4_error_stateid_expired(task->tk_status) ||
4226                 nfs4_stateid_is_current(&args->stateid,
4227                                 args->context,
4228                                 args->lock_context,
4229                                 FMODE_WRITE))
4230                 return false;
4231         rpc_restart_call_prepare(task);
4232         return true;
4233 }
4234
4235 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4236 {
4237         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4238                 return -EAGAIN;
4239         if (nfs4_write_stateid_changed(task, &hdr->args))
4240                 return -EAGAIN;
4241         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4242                 nfs4_write_done_cb(task, hdr);
4243 }
4244
4245 static
4246 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4247 {
4248         /* Don't request attributes for pNFS or O_DIRECT writes */
4249         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4250                 return false;
4251         /* Otherwise, request attributes if and only if we don't hold
4252          * a delegation
4253          */
4254         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4255 }
4256
4257 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4258                                   struct rpc_message *msg)
4259 {
4260         struct nfs_server *server = NFS_SERVER(hdr->inode);
4261
4262         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4263                 hdr->args.bitmask = NULL;
4264                 hdr->res.fattr = NULL;
4265         } else
4266                 hdr->args.bitmask = server->cache_consistency_bitmask;
4267
4268         if (!hdr->pgio_done_cb)
4269                 hdr->pgio_done_cb = nfs4_write_done_cb;
4270         hdr->res.server = server;
4271         hdr->timestamp   = jiffies;
4272
4273         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4274         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4275 }
4276
4277 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4278 {
4279         nfs4_setup_sequence(NFS_SERVER(data->inode),
4280                         &data->args.seq_args,
4281                         &data->res.seq_res,
4282                         task);
4283 }
4284
4285 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4286 {
4287         struct inode *inode = data->inode;
4288
4289         trace_nfs4_commit(data, task->tk_status);
4290         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4291                                     NULL, NULL) == -EAGAIN) {
4292                 rpc_restart_call_prepare(task);
4293                 return -EAGAIN;
4294         }
4295         return 0;
4296 }
4297
4298 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4299 {
4300         if (!nfs4_sequence_done(task, &data->res.seq_res))
4301                 return -EAGAIN;
4302         return data->commit_done_cb(task, data);
4303 }
4304
4305 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4306 {
4307         struct nfs_server *server = NFS_SERVER(data->inode);
4308
4309         if (data->commit_done_cb == NULL)
4310                 data->commit_done_cb = nfs4_commit_done_cb;
4311         data->res.server = server;
4312         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4313         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4314 }
4315
4316 struct nfs4_renewdata {
4317         struct nfs_client       *client;
4318         unsigned long           timestamp;
4319 };
4320
4321 /*
4322  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4323  * standalone procedure for queueing an asynchronous RENEW.
4324  */
4325 static void nfs4_renew_release(void *calldata)
4326 {
4327         struct nfs4_renewdata *data = calldata;
4328         struct nfs_client *clp = data->client;
4329
4330         if (atomic_read(&clp->cl_count) > 1)
4331                 nfs4_schedule_state_renewal(clp);
4332         nfs_put_client(clp);
4333         kfree(data);
4334 }
4335
4336 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4337 {
4338         struct nfs4_renewdata *data = calldata;
4339         struct nfs_client *clp = data->client;
4340         unsigned long timestamp = data->timestamp;
4341
4342         trace_nfs4_renew_async(clp, task->tk_status);
4343         switch (task->tk_status) {
4344         case 0:
4345                 break;
4346         case -NFS4ERR_LEASE_MOVED:
4347                 nfs4_schedule_lease_moved_recovery(clp);
4348                 break;
4349         default:
4350                 /* Unless we're shutting down, schedule state recovery! */
4351                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4352                         return;
4353                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4354                         nfs4_schedule_lease_recovery(clp);
4355                         return;
4356                 }
4357                 nfs4_schedule_path_down_recovery(clp);
4358         }
4359         do_renew_lease(clp, timestamp);
4360 }
4361
4362 static const struct rpc_call_ops nfs4_renew_ops = {
4363         .rpc_call_done = nfs4_renew_done,
4364         .rpc_release = nfs4_renew_release,
4365 };
4366
4367 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4368 {
4369         struct rpc_message msg = {
4370                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4371                 .rpc_argp       = clp,
4372                 .rpc_cred       = cred,
4373         };
4374         struct nfs4_renewdata *data;
4375
4376         if (renew_flags == 0)
4377                 return 0;
4378         if (!atomic_inc_not_zero(&clp->cl_count))
4379                 return -EIO;
4380         data = kmalloc(sizeof(*data), GFP_NOFS);
4381         if (data == NULL)
4382                 return -ENOMEM;
4383         data->client = clp;
4384         data->timestamp = jiffies;
4385         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4386                         &nfs4_renew_ops, data);
4387 }
4388
4389 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4390 {
4391         struct rpc_message msg = {
4392                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4393                 .rpc_argp       = clp,
4394                 .rpc_cred       = cred,
4395         };
4396         unsigned long now = jiffies;
4397         int status;
4398
4399         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4400         if (status < 0)
4401                 return status;
4402         do_renew_lease(clp, now);
4403         return 0;
4404 }
4405
4406 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4407 {
4408         return server->caps & NFS_CAP_ACLS;
4409 }
4410
4411 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4412  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4413  * the stack.
4414  */
4415 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4416
4417 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4418                 struct page **pages, unsigned int *pgbase)
4419 {
4420         struct page *newpage, **spages;
4421         int rc = 0;
4422         size_t len;
4423         spages = pages;
4424
4425         do {
4426                 len = min_t(size_t, PAGE_SIZE, buflen);
4427                 newpage = alloc_page(GFP_KERNEL);
4428
4429                 if (newpage == NULL)
4430                         goto unwind;
4431                 memcpy(page_address(newpage), buf, len);
4432                 buf += len;
4433                 buflen -= len;
4434                 *pages++ = newpage;
4435                 rc++;
4436         } while (buflen != 0);
4437
4438         return rc;
4439
4440 unwind:
4441         for(; rc > 0; rc--)
4442                 __free_page(spages[rc-1]);
4443         return -ENOMEM;
4444 }
4445
4446 struct nfs4_cached_acl {
4447         int cached;
4448         size_t len;
4449         char data[0];
4450 };
4451
4452 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4453 {
4454         struct nfs_inode *nfsi = NFS_I(inode);
4455
4456         spin_lock(&inode->i_lock);
4457         kfree(nfsi->nfs4_acl);
4458         nfsi->nfs4_acl = acl;
4459         spin_unlock(&inode->i_lock);
4460 }
4461
4462 static void nfs4_zap_acl_attr(struct inode *inode)
4463 {
4464         nfs4_set_cached_acl(inode, NULL);
4465 }
4466
4467 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4468 {
4469         struct nfs_inode *nfsi = NFS_I(inode);
4470         struct nfs4_cached_acl *acl;
4471         int ret = -ENOENT;
4472
4473         spin_lock(&inode->i_lock);
4474         acl = nfsi->nfs4_acl;
4475         if (acl == NULL)
4476                 goto out;
4477         if (buf == NULL) /* user is just asking for length */
4478                 goto out_len;
4479         if (acl->cached == 0)
4480                 goto out;
4481         ret = -ERANGE; /* see getxattr(2) man page */
4482         if (acl->len > buflen)
4483                 goto out;
4484         memcpy(buf, acl->data, acl->len);
4485 out_len:
4486         ret = acl->len;
4487 out:
4488         spin_unlock(&inode->i_lock);
4489         return ret;
4490 }
4491
4492 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4493 {
4494         struct nfs4_cached_acl *acl;
4495         size_t buflen = sizeof(*acl) + acl_len;
4496
4497         if (buflen <= PAGE_SIZE) {
4498                 acl = kmalloc(buflen, GFP_KERNEL);
4499                 if (acl == NULL)
4500                         goto out;
4501                 acl->cached = 1;
4502                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4503         } else {
4504                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4505                 if (acl == NULL)
4506                         goto out;
4507                 acl->cached = 0;
4508         }
4509         acl->len = acl_len;
4510 out:
4511         nfs4_set_cached_acl(inode, acl);
4512 }
4513
4514 /*
4515  * The getxattr API returns the required buffer length when called with a
4516  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4517  * the required buf.  On a NULL buf, we send a page of data to the server
4518  * guessing that the ACL request can be serviced by a page. If so, we cache
4519  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4520  * the cache. If not so, we throw away the page, and cache the required
4521  * length. The next getxattr call will then produce another round trip to
4522  * the server, this time with the input buf of the required size.
4523  */
4524 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4525 {
4526         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4527         struct nfs_getaclargs args = {
4528                 .fh = NFS_FH(inode),
4529                 .acl_pages = pages,
4530                 .acl_len = buflen,
4531         };
4532         struct nfs_getaclres res = {
4533                 .acl_len = buflen,
4534         };
4535         struct rpc_message msg = {
4536                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4537                 .rpc_argp = &args,
4538                 .rpc_resp = &res,
4539         };
4540         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4541         int ret = -ENOMEM, i;
4542
4543         /* As long as we're doing a round trip to the server anyway,
4544          * let's be prepared for a page of acl data. */
4545         if (npages == 0)
4546                 npages = 1;
4547         if (npages > ARRAY_SIZE(pages))
4548                 return -ERANGE;
4549
4550         for (i = 0; i < npages; i++) {
4551                 pages[i] = alloc_page(GFP_KERNEL);
4552                 if (!pages[i])
4553                         goto out_free;
4554         }
4555
4556         /* for decoding across pages */
4557         res.acl_scratch = alloc_page(GFP_KERNEL);
4558         if (!res.acl_scratch)
4559                 goto out_free;
4560
4561         args.acl_len = npages * PAGE_SIZE;
4562         args.acl_pgbase = 0;
4563
4564         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4565                 __func__, buf, buflen, npages, args.acl_len);
4566         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4567                              &msg, &args.seq_args, &res.seq_res, 0);
4568         if (ret)
4569                 goto out_free;
4570
4571         /* Handle the case where the passed-in buffer is too short */
4572         if (res.acl_flags & NFS4_ACL_TRUNC) {
4573                 /* Did the user only issue a request for the acl length? */
4574                 if (buf == NULL)
4575                         goto out_ok;
4576                 ret = -ERANGE;
4577                 goto out_free;
4578         }
4579         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4580         if (buf) {
4581                 if (res.acl_len > buflen) {
4582                         ret = -ERANGE;
4583                         goto out_free;
4584                 }
4585                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4586         }
4587 out_ok:
4588         ret = res.acl_len;
4589 out_free:
4590         for (i = 0; i < npages; i++)
4591                 if (pages[i])
4592                         __free_page(pages[i]);
4593         if (res.acl_scratch)
4594                 __free_page(res.acl_scratch);
4595         return ret;
4596 }
4597
4598 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4599 {
4600         struct nfs4_exception exception = { };
4601         ssize_t ret;
4602         do {
4603                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4604                 trace_nfs4_get_acl(inode, ret);
4605                 if (ret >= 0)
4606                         break;
4607                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4608         } while (exception.retry);
4609         return ret;
4610 }
4611
4612 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4613 {
4614         struct nfs_server *server = NFS_SERVER(inode);
4615         int ret;
4616
4617         if (!nfs4_server_supports_acls(server))
4618                 return -EOPNOTSUPP;
4619         ret = nfs_revalidate_inode(server, inode);
4620         if (ret < 0)
4621                 return ret;
4622         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4623                 nfs_zap_acl_cache(inode);
4624         ret = nfs4_read_cached_acl(inode, buf, buflen);
4625         if (ret != -ENOENT)
4626                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4627                  * but no cached acl data, just the acl length */
4628                 return ret;
4629         return nfs4_get_acl_uncached(inode, buf, buflen);
4630 }
4631
4632 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4633 {
4634         struct nfs_server *server = NFS_SERVER(inode);
4635         struct page *pages[NFS4ACL_MAXPAGES];
4636         struct nfs_setaclargs arg = {
4637                 .fh             = NFS_FH(inode),
4638                 .acl_pages      = pages,
4639                 .acl_len        = buflen,
4640         };
4641         struct nfs_setaclres res;
4642         struct rpc_message msg = {
4643                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4644                 .rpc_argp       = &arg,
4645                 .rpc_resp       = &res,
4646         };
4647         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4648         int ret, i;
4649
4650         if (!nfs4_server_supports_acls(server))
4651                 return -EOPNOTSUPP;
4652         if (npages > ARRAY_SIZE(pages))
4653                 return -ERANGE;
4654         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4655         if (i < 0)
4656                 return i;
4657         nfs4_inode_return_delegation(inode);
4658         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4659
4660         /*
4661          * Free each page after tx, so the only ref left is
4662          * held by the network stack
4663          */
4664         for (; i > 0; i--)
4665                 put_page(pages[i-1]);
4666
4667         /*
4668          * Acl update can result in inode attribute update.
4669          * so mark the attribute cache invalid.
4670          */
4671         spin_lock(&inode->i_lock);
4672         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4673         spin_unlock(&inode->i_lock);
4674         nfs_access_zap_cache(inode);
4675         nfs_zap_acl_cache(inode);
4676         return ret;
4677 }
4678
4679 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4680 {
4681         struct nfs4_exception exception = { };
4682         int err;
4683         do {
4684                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4685                 trace_nfs4_set_acl(inode, err);
4686                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4687                                 &exception);
4688         } while (exception.retry);
4689         return err;
4690 }
4691
4692 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4693 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4694                                         size_t buflen)
4695 {
4696         struct nfs_server *server = NFS_SERVER(inode);
4697         struct nfs_fattr fattr;
4698         struct nfs4_label label = {0, 0, buflen, buf};
4699
4700         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4701         struct nfs4_getattr_arg arg = {
4702                 .fh             = NFS_FH(inode),
4703                 .bitmask        = bitmask,
4704         };
4705         struct nfs4_getattr_res res = {
4706                 .fattr          = &fattr,
4707                 .label          = &label,
4708                 .server         = server,
4709         };
4710         struct rpc_message msg = {
4711                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4712                 .rpc_argp       = &arg,
4713                 .rpc_resp       = &res,
4714         };
4715         int ret;
4716
4717         nfs_fattr_init(&fattr);
4718
4719         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4720         if (ret)
4721                 return ret;
4722         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4723                 return -ENOENT;
4724         if (buflen < label.len)
4725                 return -ERANGE;
4726         return 0;
4727 }
4728
4729 static int nfs4_get_security_label(struct inode *inode, void *buf,
4730                                         size_t buflen)
4731 {
4732         struct nfs4_exception exception = { };
4733         int err;
4734
4735         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4736                 return -EOPNOTSUPP;
4737
4738         do {
4739                 err = _nfs4_get_security_label(inode, buf, buflen);
4740                 trace_nfs4_get_security_label(inode, err);
4741                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4742                                 &exception);
4743         } while (exception.retry);
4744         return err;
4745 }
4746
4747 static int _nfs4_do_set_security_label(struct inode *inode,
4748                 struct nfs4_label *ilabel,
4749                 struct nfs_fattr *fattr,
4750                 struct nfs4_label *olabel)
4751 {
4752
4753         struct iattr sattr = {0};
4754         struct nfs_server *server = NFS_SERVER(inode);
4755         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4756         struct nfs_setattrargs arg = {
4757                 .fh             = NFS_FH(inode),
4758                 .iap            = &sattr,
4759                 .server         = server,
4760                 .bitmask        = bitmask,
4761                 .label          = ilabel,
4762         };
4763         struct nfs_setattrres res = {
4764                 .fattr          = fattr,
4765                 .label          = olabel,
4766                 .server         = server,
4767         };
4768         struct rpc_message msg = {
4769                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4770                 .rpc_argp       = &arg,
4771                 .rpc_resp       = &res,
4772         };
4773         int status;
4774
4775         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4776
4777         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4778         if (status)
4779                 dprintk("%s failed: %d\n", __func__, status);
4780
4781         return status;
4782 }
4783
4784 static int nfs4_do_set_security_label(struct inode *inode,
4785                 struct nfs4_label *ilabel,
4786                 struct nfs_fattr *fattr,
4787                 struct nfs4_label *olabel)
4788 {
4789         struct nfs4_exception exception = { };
4790         int err;
4791
4792         do {
4793                 err = _nfs4_do_set_security_label(inode, ilabel,
4794                                 fattr, olabel);
4795                 trace_nfs4_set_security_label(inode, err);
4796                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4797                                 &exception);
4798         } while (exception.retry);
4799         return err;
4800 }
4801
4802 static int
4803 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4804 {
4805         struct nfs4_label ilabel, *olabel = NULL;
4806         struct nfs_fattr fattr;
4807         struct rpc_cred *cred;
4808         struct inode *inode = dentry->d_inode;
4809         int status;
4810
4811         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4812                 return -EOPNOTSUPP;
4813
4814         nfs_fattr_init(&fattr);
4815
4816         ilabel.pi = 0;
4817         ilabel.lfs = 0;
4818         ilabel.label = (char *)buf;
4819         ilabel.len = buflen;
4820
4821         cred = rpc_lookup_cred();
4822         if (IS_ERR(cred))
4823                 return PTR_ERR(cred);
4824
4825         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4826         if (IS_ERR(olabel)) {
4827                 status = -PTR_ERR(olabel);
4828                 goto out;
4829         }
4830
4831         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4832         if (status == 0)
4833                 nfs_setsecurity(inode, &fattr, olabel);
4834
4835         nfs4_label_free(olabel);
4836 out:
4837         put_rpccred(cred);
4838         return status;
4839 }
4840 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4841
4842
4843 static int
4844 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4845                         struct nfs4_state *state, long *timeout)
4846 {
4847         struct nfs_client *clp = server->nfs_client;
4848
4849         if (task->tk_status >= 0)
4850                 return 0;
4851         switch(task->tk_status) {
4852                 case -NFS4ERR_DELEG_REVOKED:
4853                 case -NFS4ERR_ADMIN_REVOKED:
4854                 case -NFS4ERR_BAD_STATEID:
4855                         if (state == NULL)
4856                                 break;
4857                         nfs_remove_bad_delegation(state->inode);
4858                 case -NFS4ERR_OPENMODE:
4859                         if (state == NULL)
4860                                 break;
4861                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4862                                 goto recovery_failed;
4863                         goto wait_on_recovery;
4864                 case -NFS4ERR_EXPIRED:
4865                         if (state != NULL) {
4866                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4867                                         goto recovery_failed;
4868                         }
4869                 case -NFS4ERR_STALE_STATEID:
4870                 case -NFS4ERR_STALE_CLIENTID:
4871                         nfs4_schedule_lease_recovery(clp);
4872                         goto wait_on_recovery;
4873                 case -NFS4ERR_MOVED:
4874                         if (nfs4_schedule_migration_recovery(server) < 0)
4875                                 goto recovery_failed;
4876                         goto wait_on_recovery;
4877                 case -NFS4ERR_LEASE_MOVED:
4878                         nfs4_schedule_lease_moved_recovery(clp);
4879                         goto wait_on_recovery;
4880 #if defined(CONFIG_NFS_V4_1)
4881                 case -NFS4ERR_BADSESSION:
4882                 case -NFS4ERR_BADSLOT:
4883                 case -NFS4ERR_BAD_HIGH_SLOT:
4884                 case -NFS4ERR_DEADSESSION:
4885                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4886                 case -NFS4ERR_SEQ_FALSE_RETRY:
4887                 case -NFS4ERR_SEQ_MISORDERED:
4888                         dprintk("%s ERROR %d, Reset session\n", __func__,
4889                                 task->tk_status);
4890                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4891                         goto wait_on_recovery;
4892 #endif /* CONFIG_NFS_V4_1 */
4893                 case -NFS4ERR_DELAY:
4894                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4895                         rpc_delay(task, nfs4_update_delay(timeout));
4896                         goto restart_call;
4897                 case -NFS4ERR_GRACE:
4898                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4899                 case -NFS4ERR_RETRY_UNCACHED_REP:
4900                 case -NFS4ERR_OLD_STATEID:
4901                         goto restart_call;
4902         }
4903         task->tk_status = nfs4_map_errors(task->tk_status);
4904         return 0;
4905 recovery_failed:
4906         task->tk_status = -EIO;
4907         return 0;
4908 wait_on_recovery:
4909         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4910         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4911                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4912         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4913                 goto recovery_failed;
4914 restart_call:
4915         task->tk_status = 0;
4916         return -EAGAIN;
4917 }
4918
4919 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4920                                     nfs4_verifier *bootverf)
4921 {
4922         __be32 verf[2];
4923
4924         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4925                 /* An impossible timestamp guarantees this value
4926                  * will never match a generated boot time. */
4927                 verf[0] = 0;
4928                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4929         } else {
4930                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4931                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4932                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4933         }
4934         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4935 }
4936
4937 static unsigned int
4938 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4939                                    char *buf, size_t len)
4940 {
4941         unsigned int result;
4942
4943         rcu_read_lock();
4944         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4945                                 clp->cl_ipaddr,
4946                                 rpc_peeraddr2str(clp->cl_rpcclient,
4947                                                         RPC_DISPLAY_ADDR),
4948                                 rpc_peeraddr2str(clp->cl_rpcclient,
4949                                                         RPC_DISPLAY_PROTO));
4950         rcu_read_unlock();
4951         return result;
4952 }
4953
4954 static unsigned int
4955 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4956                                 char *buf, size_t len)
4957 {
4958         const char *nodename = clp->cl_rpcclient->cl_nodename;
4959
4960         if (nfs4_client_id_uniquifier[0] != '\0')
4961                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4962                                 clp->rpc_ops->version,
4963                                 clp->cl_minorversion,
4964                                 nfs4_client_id_uniquifier,
4965                                 nodename);
4966         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4967                                 clp->rpc_ops->version, clp->cl_minorversion,
4968                                 nodename);
4969 }
4970
4971 /*
4972  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4973  * services.  Advertise one based on the address family of the
4974  * clientaddr.
4975  */
4976 static unsigned int
4977 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4978 {
4979         if (strchr(clp->cl_ipaddr, ':') != NULL)
4980                 return scnprintf(buf, len, "tcp6");
4981         else
4982                 return scnprintf(buf, len, "tcp");
4983 }
4984
4985 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4986 {
4987         struct nfs4_setclientid *sc = calldata;
4988
4989         if (task->tk_status == 0)
4990                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4991 }
4992
4993 static const struct rpc_call_ops nfs4_setclientid_ops = {
4994         .rpc_call_done = nfs4_setclientid_done,
4995 };
4996
4997 /**
4998  * nfs4_proc_setclientid - Negotiate client ID
4999  * @clp: state data structure
5000  * @program: RPC program for NFSv4 callback service
5001  * @port: IP port number for NFS4 callback service
5002  * @cred: RPC credential to use for this call
5003  * @res: where to place the result
5004  *
5005  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5006  */
5007 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5008                 unsigned short port, struct rpc_cred *cred,
5009                 struct nfs4_setclientid_res *res)
5010 {
5011         nfs4_verifier sc_verifier;
5012         struct nfs4_setclientid setclientid = {
5013                 .sc_verifier = &sc_verifier,
5014                 .sc_prog = program,
5015                 .sc_cb_ident = clp->cl_cb_ident,
5016         };
5017         struct rpc_message msg = {
5018                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5019                 .rpc_argp = &setclientid,
5020                 .rpc_resp = res,
5021                 .rpc_cred = cred,
5022         };
5023         struct rpc_task *task;
5024         struct rpc_task_setup task_setup_data = {
5025                 .rpc_client = clp->cl_rpcclient,
5026                 .rpc_message = &msg,
5027                 .callback_ops = &nfs4_setclientid_ops,
5028                 .callback_data = &setclientid,
5029                 .flags = RPC_TASK_TIMEOUT,
5030         };
5031         int status;
5032
5033         /* nfs_client_id4 */
5034         nfs4_init_boot_verifier(clp, &sc_verifier);
5035         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5036                 setclientid.sc_name_len =
5037                                 nfs4_init_uniform_client_string(clp,
5038                                                 setclientid.sc_name,
5039                                                 sizeof(setclientid.sc_name));
5040         else
5041                 setclientid.sc_name_len =
5042                                 nfs4_init_nonuniform_client_string(clp,
5043                                                 setclientid.sc_name,
5044                                                 sizeof(setclientid.sc_name));
5045         /* cb_client4 */
5046         setclientid.sc_netid_len =
5047                                 nfs4_init_callback_netid(clp,
5048                                                 setclientid.sc_netid,
5049                                                 sizeof(setclientid.sc_netid));
5050         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5051                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5052                                 clp->cl_ipaddr, port >> 8, port & 255);
5053
5054         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5055                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5056                 setclientid.sc_name_len, setclientid.sc_name);
5057         task = rpc_run_task(&task_setup_data);
5058         if (IS_ERR(task)) {
5059                 status = PTR_ERR(task);
5060                 goto out;
5061         }
5062         status = task->tk_status;
5063         if (setclientid.sc_cred) {
5064                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5065                 put_rpccred(setclientid.sc_cred);
5066         }
5067         rpc_put_task(task);
5068 out:
5069         trace_nfs4_setclientid(clp, status);
5070         dprintk("NFS reply setclientid: %d\n", status);
5071         return status;
5072 }
5073
5074 /**
5075  * nfs4_proc_setclientid_confirm - Confirm client ID
5076  * @clp: state data structure
5077  * @res: result of a previous SETCLIENTID
5078  * @cred: RPC credential to use for this call
5079  *
5080  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5081  */
5082 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5083                 struct nfs4_setclientid_res *arg,
5084                 struct rpc_cred *cred)
5085 {
5086         struct rpc_message msg = {
5087                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5088                 .rpc_argp = arg,
5089                 .rpc_cred = cred,
5090         };
5091         int status;
5092
5093         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5094                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5095                 clp->cl_clientid);
5096         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5097         trace_nfs4_setclientid_confirm(clp, status);
5098         dprintk("NFS reply setclientid_confirm: %d\n", status);
5099         return status;
5100 }
5101
5102 struct nfs4_delegreturndata {
5103         struct nfs4_delegreturnargs args;
5104         struct nfs4_delegreturnres res;
5105         struct nfs_fh fh;
5106         nfs4_stateid stateid;
5107         unsigned long timestamp;
5108         struct nfs_fattr fattr;
5109         int rpc_status;
5110         struct inode *inode;
5111         bool roc;
5112         u32 roc_barrier;
5113 };
5114
5115 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5116 {
5117         struct nfs4_delegreturndata *data = calldata;
5118
5119         if (!nfs4_sequence_done(task, &data->res.seq_res))
5120                 return;
5121
5122         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5123         switch (task->tk_status) {
5124         case 0:
5125                 renew_lease(data->res.server, data->timestamp);
5126         case -NFS4ERR_ADMIN_REVOKED:
5127         case -NFS4ERR_DELEG_REVOKED:
5128         case -NFS4ERR_BAD_STATEID:
5129         case -NFS4ERR_OLD_STATEID:
5130         case -NFS4ERR_STALE_STATEID:
5131         case -NFS4ERR_EXPIRED:
5132                 task->tk_status = 0;
5133                 if (data->roc)
5134                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5135                 break;
5136         default:
5137                 if (nfs4_async_handle_error(task, data->res.server,
5138                                             NULL, NULL) == -EAGAIN) {
5139                         rpc_restart_call_prepare(task);
5140                         return;
5141                 }
5142         }
5143         data->rpc_status = task->tk_status;
5144 }
5145
5146 static void nfs4_delegreturn_release(void *calldata)
5147 {
5148         struct nfs4_delegreturndata *data = calldata;
5149
5150         if (data->roc)
5151                 pnfs_roc_release(data->inode);
5152         kfree(calldata);
5153 }
5154
5155 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5156 {
5157         struct nfs4_delegreturndata *d_data;
5158
5159         d_data = (struct nfs4_delegreturndata *)data;
5160
5161         if (d_data->roc &&
5162             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5163                 return;
5164
5165         nfs4_setup_sequence(d_data->res.server,
5166                         &d_data->args.seq_args,
5167                         &d_data->res.seq_res,
5168                         task);
5169 }
5170
5171 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5172         .rpc_call_prepare = nfs4_delegreturn_prepare,
5173         .rpc_call_done = nfs4_delegreturn_done,
5174         .rpc_release = nfs4_delegreturn_release,
5175 };
5176
5177 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5178 {
5179         struct nfs4_delegreturndata *data;
5180         struct nfs_server *server = NFS_SERVER(inode);
5181         struct rpc_task *task;
5182         struct rpc_message msg = {
5183                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5184                 .rpc_cred = cred,
5185         };
5186         struct rpc_task_setup task_setup_data = {
5187                 .rpc_client = server->client,
5188                 .rpc_message = &msg,
5189                 .callback_ops = &nfs4_delegreturn_ops,
5190                 .flags = RPC_TASK_ASYNC,
5191         };
5192         int status = 0;
5193
5194         data = kzalloc(sizeof(*data), GFP_NOFS);
5195         if (data == NULL)
5196                 return -ENOMEM;
5197         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5198         data->args.fhandle = &data->fh;
5199         data->args.stateid = &data->stateid;
5200         data->args.bitmask = server->cache_consistency_bitmask;
5201         nfs_copy_fh(&data->fh, NFS_FH(inode));
5202         nfs4_stateid_copy(&data->stateid, stateid);
5203         data->res.fattr = &data->fattr;
5204         data->res.server = server;
5205         nfs_fattr_init(data->res.fattr);
5206         data->timestamp = jiffies;
5207         data->rpc_status = 0;
5208         data->inode = inode;
5209         data->roc = list_empty(&NFS_I(inode)->open_files) ?
5210                     pnfs_roc(inode) : false;
5211
5212         task_setup_data.callback_data = data;
5213         msg.rpc_argp = &data->args;
5214         msg.rpc_resp = &data->res;
5215         task = rpc_run_task(&task_setup_data);
5216         if (IS_ERR(task))
5217                 return PTR_ERR(task);
5218         if (!issync)
5219                 goto out;
5220         status = nfs4_wait_for_completion_rpc_task(task);
5221         if (status != 0)
5222                 goto out;
5223         status = data->rpc_status;
5224         if (status == 0)
5225                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5226         else
5227                 nfs_refresh_inode(inode, &data->fattr);
5228 out:
5229         rpc_put_task(task);
5230         return status;
5231 }
5232
5233 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5234 {
5235         struct nfs_server *server = NFS_SERVER(inode);
5236         struct nfs4_exception exception = { };
5237         int err;
5238         do {
5239                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5240                 trace_nfs4_delegreturn(inode, err);
5241                 switch (err) {
5242                         case -NFS4ERR_STALE_STATEID:
5243                         case -NFS4ERR_EXPIRED:
5244                         case 0:
5245                                 return 0;
5246                 }
5247                 err = nfs4_handle_exception(server, err, &exception);
5248         } while (exception.retry);
5249         return err;
5250 }
5251
5252 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5253 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5254
5255 /*
5256  * sleep, with exponential backoff, and retry the LOCK operation.
5257  */
5258 static unsigned long
5259 nfs4_set_lock_task_retry(unsigned long timeout)
5260 {
5261         freezable_schedule_timeout_killable_unsafe(timeout);
5262         timeout <<= 1;
5263         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5264                 return NFS4_LOCK_MAXTIMEOUT;
5265         return timeout;
5266 }
5267
5268 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5269 {
5270         struct inode *inode = state->inode;
5271         struct nfs_server *server = NFS_SERVER(inode);
5272         struct nfs_client *clp = server->nfs_client;
5273         struct nfs_lockt_args arg = {
5274                 .fh = NFS_FH(inode),
5275                 .fl = request,
5276         };
5277         struct nfs_lockt_res res = {
5278                 .denied = request,
5279         };
5280         struct rpc_message msg = {
5281                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5282                 .rpc_argp       = &arg,
5283                 .rpc_resp       = &res,
5284                 .rpc_cred       = state->owner->so_cred,
5285         };
5286         struct nfs4_lock_state *lsp;
5287         int status;
5288
5289         arg.lock_owner.clientid = clp->cl_clientid;
5290         status = nfs4_set_lock_state(state, request);
5291         if (status != 0)
5292                 goto out;
5293         lsp = request->fl_u.nfs4_fl.owner;
5294         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5295         arg.lock_owner.s_dev = server->s_dev;
5296         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5297         switch (status) {
5298                 case 0:
5299                         request->fl_type = F_UNLCK;
5300                         break;
5301                 case -NFS4ERR_DENIED:
5302                         status = 0;
5303         }
5304         request->fl_ops->fl_release_private(request);
5305         request->fl_ops = NULL;
5306 out:
5307         return status;
5308 }
5309
5310 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5311 {
5312         struct nfs4_exception exception = { };
5313         int err;
5314
5315         do {
5316                 err = _nfs4_proc_getlk(state, cmd, request);
5317                 trace_nfs4_get_lock(request, state, cmd, err);
5318                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5319                                 &exception);
5320         } while (exception.retry);
5321         return err;
5322 }
5323
5324 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5325 {
5326         int res = 0;
5327         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5328                 case FL_POSIX:
5329                         res = posix_lock_file_wait(file, fl);
5330                         break;
5331                 case FL_FLOCK:
5332                         res = flock_lock_file_wait(file, fl);
5333                         break;
5334                 default:
5335                         BUG();
5336         }
5337         return res;
5338 }
5339
5340 struct nfs4_unlockdata {
5341         struct nfs_locku_args arg;
5342         struct nfs_locku_res res;
5343         struct nfs4_lock_state *lsp;
5344         struct nfs_open_context *ctx;
5345         struct file_lock fl;
5346         const struct nfs_server *server;
5347         unsigned long timestamp;
5348 };
5349
5350 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5351                 struct nfs_open_context *ctx,
5352                 struct nfs4_lock_state *lsp,
5353                 struct nfs_seqid *seqid)
5354 {
5355         struct nfs4_unlockdata *p;
5356         struct inode *inode = lsp->ls_state->inode;
5357
5358         p = kzalloc(sizeof(*p), GFP_NOFS);
5359         if (p == NULL)
5360                 return NULL;
5361         p->arg.fh = NFS_FH(inode);
5362         p->arg.fl = &p->fl;
5363         p->arg.seqid = seqid;
5364         p->res.seqid = seqid;
5365         p->arg.stateid = &lsp->ls_stateid;
5366         p->lsp = lsp;
5367         atomic_inc(&lsp->ls_count);
5368         /* Ensure we don't close file until we're done freeing locks! */
5369         p->ctx = get_nfs_open_context(ctx);
5370         memcpy(&p->fl, fl, sizeof(p->fl));
5371         p->server = NFS_SERVER(inode);
5372         return p;
5373 }
5374
5375 static void nfs4_locku_release_calldata(void *data)
5376 {
5377         struct nfs4_unlockdata *calldata = data;
5378         nfs_free_seqid(calldata->arg.seqid);
5379         nfs4_put_lock_state(calldata->lsp);
5380         put_nfs_open_context(calldata->ctx);
5381         kfree(calldata);
5382 }
5383
5384 static void nfs4_locku_done(struct rpc_task *task, void *data)
5385 {
5386         struct nfs4_unlockdata *calldata = data;
5387
5388         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5389                 return;
5390         switch (task->tk_status) {
5391                 case 0:
5392                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5393                                         &calldata->res.stateid);
5394                         renew_lease(calldata->server, calldata->timestamp);
5395                         break;
5396                 case -NFS4ERR_BAD_STATEID:
5397                 case -NFS4ERR_OLD_STATEID:
5398                 case -NFS4ERR_STALE_STATEID:
5399                 case -NFS4ERR_EXPIRED:
5400                         break;
5401                 default:
5402                         if (nfs4_async_handle_error(task, calldata->server,
5403                                                     NULL, NULL) == -EAGAIN)
5404                                 rpc_restart_call_prepare(task);
5405         }
5406         nfs_release_seqid(calldata->arg.seqid);
5407 }
5408
5409 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5410 {
5411         struct nfs4_unlockdata *calldata = data;
5412
5413         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5414                 goto out_wait;
5415         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5416                 /* Note: exit _without_ running nfs4_locku_done */
5417                 goto out_no_action;
5418         }
5419         calldata->timestamp = jiffies;
5420         if (nfs4_setup_sequence(calldata->server,
5421                                 &calldata->arg.seq_args,
5422                                 &calldata->res.seq_res,
5423                                 task) != 0)
5424                 nfs_release_seqid(calldata->arg.seqid);
5425         return;
5426 out_no_action:
5427         task->tk_action = NULL;
5428 out_wait:
5429         nfs4_sequence_done(task, &calldata->res.seq_res);
5430 }
5431
5432 static const struct rpc_call_ops nfs4_locku_ops = {
5433         .rpc_call_prepare = nfs4_locku_prepare,
5434         .rpc_call_done = nfs4_locku_done,
5435         .rpc_release = nfs4_locku_release_calldata,
5436 };
5437
5438 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5439                 struct nfs_open_context *ctx,
5440                 struct nfs4_lock_state *lsp,
5441                 struct nfs_seqid *seqid)
5442 {
5443         struct nfs4_unlockdata *data;
5444         struct rpc_message msg = {
5445                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5446                 .rpc_cred = ctx->cred,
5447         };
5448         struct rpc_task_setup task_setup_data = {
5449                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5450                 .rpc_message = &msg,
5451                 .callback_ops = &nfs4_locku_ops,
5452                 .workqueue = nfsiod_workqueue,
5453                 .flags = RPC_TASK_ASYNC,
5454         };
5455
5456         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5457                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5458
5459         /* Ensure this is an unlock - when canceling a lock, the
5460          * canceled lock is passed in, and it won't be an unlock.
5461          */
5462         fl->fl_type = F_UNLCK;
5463
5464         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5465         if (data == NULL) {
5466                 nfs_free_seqid(seqid);
5467                 return ERR_PTR(-ENOMEM);
5468         }
5469
5470         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5471         msg.rpc_argp = &data->arg;
5472         msg.rpc_resp = &data->res;
5473         task_setup_data.callback_data = data;
5474         return rpc_run_task(&task_setup_data);
5475 }
5476
5477 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5478 {
5479         struct inode *inode = state->inode;
5480         struct nfs4_state_owner *sp = state->owner;
5481         struct nfs_inode *nfsi = NFS_I(inode);
5482         struct nfs_seqid *seqid;
5483         struct nfs4_lock_state *lsp;
5484         struct rpc_task *task;
5485         int status = 0;
5486         unsigned char fl_flags = request->fl_flags;
5487
5488         status = nfs4_set_lock_state(state, request);
5489         /* Unlock _before_ we do the RPC call */
5490         request->fl_flags |= FL_EXISTS;
5491         /* Exclude nfs_delegation_claim_locks() */
5492         mutex_lock(&sp->so_delegreturn_mutex);
5493         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5494         down_read(&nfsi->rwsem);
5495         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5496                 up_read(&nfsi->rwsem);
5497                 mutex_unlock(&sp->so_delegreturn_mutex);
5498                 goto out;
5499         }
5500         up_read(&nfsi->rwsem);
5501         mutex_unlock(&sp->so_delegreturn_mutex);
5502         if (status != 0)
5503                 goto out;
5504         /* Is this a delegated lock? */
5505         lsp = request->fl_u.nfs4_fl.owner;
5506         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5507                 goto out;
5508         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5509         status = -ENOMEM;
5510         if (seqid == NULL)
5511                 goto out;
5512         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5513         status = PTR_ERR(task);
5514         if (IS_ERR(task))
5515                 goto out;
5516         status = nfs4_wait_for_completion_rpc_task(task);
5517         rpc_put_task(task);
5518 out:
5519         request->fl_flags = fl_flags;
5520         trace_nfs4_unlock(request, state, F_SETLK, status);
5521         return status;
5522 }
5523
5524 struct nfs4_lockdata {
5525         struct nfs_lock_args arg;
5526         struct nfs_lock_res res;
5527         struct nfs4_lock_state *lsp;
5528         struct nfs_open_context *ctx;
5529         struct file_lock fl;
5530         unsigned long timestamp;
5531         int rpc_status;
5532         int cancelled;
5533         struct nfs_server *server;
5534 };
5535
5536 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5537                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5538                 gfp_t gfp_mask)
5539 {
5540         struct nfs4_lockdata *p;
5541         struct inode *inode = lsp->ls_state->inode;
5542         struct nfs_server *server = NFS_SERVER(inode);
5543
5544         p = kzalloc(sizeof(*p), gfp_mask);
5545         if (p == NULL)
5546                 return NULL;
5547
5548         p->arg.fh = NFS_FH(inode);
5549         p->arg.fl = &p->fl;
5550         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5551         if (p->arg.open_seqid == NULL)
5552                 goto out_free;
5553         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5554         if (p->arg.lock_seqid == NULL)
5555                 goto out_free_seqid;
5556         p->arg.lock_stateid = &lsp->ls_stateid;
5557         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5558         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5559         p->arg.lock_owner.s_dev = server->s_dev;
5560         p->res.lock_seqid = p->arg.lock_seqid;
5561         p->lsp = lsp;
5562         p->server = server;
5563         atomic_inc(&lsp->ls_count);
5564         p->ctx = get_nfs_open_context(ctx);
5565         memcpy(&p->fl, fl, sizeof(p->fl));
5566         return p;
5567 out_free_seqid:
5568         nfs_free_seqid(p->arg.open_seqid);
5569 out_free:
5570         kfree(p);
5571         return NULL;
5572 }
5573
5574 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5575 {
5576         struct nfs4_lockdata *data = calldata;
5577         struct nfs4_state *state = data->lsp->ls_state;
5578
5579         dprintk("%s: begin!\n", __func__);
5580         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5581                 goto out_wait;
5582         /* Do we need to do an open_to_lock_owner? */
5583         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5584                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5585                         goto out_release_lock_seqid;
5586                 }
5587                 data->arg.open_stateid = &state->open_stateid;
5588                 data->arg.new_lock_owner = 1;
5589                 data->res.open_seqid = data->arg.open_seqid;
5590         } else
5591                 data->arg.new_lock_owner = 0;
5592         if (!nfs4_valid_open_stateid(state)) {
5593                 data->rpc_status = -EBADF;
5594                 task->tk_action = NULL;
5595                 goto out_release_open_seqid;
5596         }
5597         data->timestamp = jiffies;
5598         if (nfs4_setup_sequence(data->server,
5599                                 &data->arg.seq_args,
5600                                 &data->res.seq_res,
5601                                 task) == 0)
5602                 return;
5603 out_release_open_seqid:
5604         nfs_release_seqid(data->arg.open_seqid);
5605 out_release_lock_seqid:
5606         nfs_release_seqid(data->arg.lock_seqid);
5607 out_wait:
5608         nfs4_sequence_done(task, &data->res.seq_res);
5609         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5610 }
5611
5612 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5613 {
5614         struct nfs4_lockdata *data = calldata;
5615
5616         dprintk("%s: begin!\n", __func__);
5617
5618         if (!nfs4_sequence_done(task, &data->res.seq_res))
5619                 return;
5620
5621         data->rpc_status = task->tk_status;
5622         if (data->arg.new_lock_owner != 0) {
5623                 if (data->rpc_status == 0)
5624                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5625                 else
5626                         goto out;
5627         }
5628         if (data->rpc_status == 0) {
5629                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5630                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5631                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5632         }
5633 out:
5634         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5635 }
5636
5637 static void nfs4_lock_release(void *calldata)
5638 {
5639         struct nfs4_lockdata *data = calldata;
5640
5641         dprintk("%s: begin!\n", __func__);
5642         nfs_free_seqid(data->arg.open_seqid);
5643         if (data->cancelled != 0) {
5644                 struct rpc_task *task;
5645                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5646                                 data->arg.lock_seqid);
5647                 if (!IS_ERR(task))
5648                         rpc_put_task_async(task);
5649                 dprintk("%s: cancelling lock!\n", __func__);
5650         } else
5651                 nfs_free_seqid(data->arg.lock_seqid);
5652         nfs4_put_lock_state(data->lsp);
5653         put_nfs_open_context(data->ctx);
5654         kfree(data);
5655         dprintk("%s: done!\n", __func__);
5656 }
5657
5658 static const struct rpc_call_ops nfs4_lock_ops = {
5659         .rpc_call_prepare = nfs4_lock_prepare,
5660         .rpc_call_done = nfs4_lock_done,
5661         .rpc_release = nfs4_lock_release,
5662 };
5663
5664 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5665 {
5666         switch (error) {
5667         case -NFS4ERR_ADMIN_REVOKED:
5668         case -NFS4ERR_BAD_STATEID:
5669                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5670                 if (new_lock_owner != 0 ||
5671                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5672                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5673                 break;
5674         case -NFS4ERR_STALE_STATEID:
5675                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5676         case -NFS4ERR_EXPIRED:
5677                 nfs4_schedule_lease_recovery(server->nfs_client);
5678         };
5679 }
5680
5681 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5682 {
5683         struct nfs4_lockdata *data;
5684         struct rpc_task *task;
5685         struct rpc_message msg = {
5686                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5687                 .rpc_cred = state->owner->so_cred,
5688         };
5689         struct rpc_task_setup task_setup_data = {
5690                 .rpc_client = NFS_CLIENT(state->inode),
5691                 .rpc_message = &msg,
5692                 .callback_ops = &nfs4_lock_ops,
5693                 .workqueue = nfsiod_workqueue,
5694                 .flags = RPC_TASK_ASYNC,
5695         };
5696         int ret;
5697
5698         dprintk("%s: begin!\n", __func__);
5699         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5700                         fl->fl_u.nfs4_fl.owner,
5701                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5702         if (data == NULL)
5703                 return -ENOMEM;
5704         if (IS_SETLKW(cmd))
5705                 data->arg.block = 1;
5706         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5707         msg.rpc_argp = &data->arg;
5708         msg.rpc_resp = &data->res;
5709         task_setup_data.callback_data = data;
5710         if (recovery_type > NFS_LOCK_NEW) {
5711                 if (recovery_type == NFS_LOCK_RECLAIM)
5712                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5713                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5714         }
5715         task = rpc_run_task(&task_setup_data);
5716         if (IS_ERR(task))
5717                 return PTR_ERR(task);
5718         ret = nfs4_wait_for_completion_rpc_task(task);
5719         if (ret == 0) {
5720                 ret = data->rpc_status;
5721                 if (ret)
5722                         nfs4_handle_setlk_error(data->server, data->lsp,
5723                                         data->arg.new_lock_owner, ret);
5724         } else
5725                 data->cancelled = 1;
5726         rpc_put_task(task);
5727         dprintk("%s: done, ret = %d!\n", __func__, ret);
5728         return ret;
5729 }
5730
5731 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5732 {
5733         struct nfs_server *server = NFS_SERVER(state->inode);
5734         struct nfs4_exception exception = {
5735                 .inode = state->inode,
5736         };
5737         int err;
5738
5739         do {
5740                 /* Cache the lock if possible... */
5741                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5742                         return 0;
5743                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5744                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5745                 if (err != -NFS4ERR_DELAY)
5746                         break;
5747                 nfs4_handle_exception(server, err, &exception);
5748         } while (exception.retry);
5749         return err;
5750 }
5751
5752 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5753 {
5754         struct nfs_server *server = NFS_SERVER(state->inode);
5755         struct nfs4_exception exception = {
5756                 .inode = state->inode,
5757         };
5758         int err;
5759
5760         err = nfs4_set_lock_state(state, request);
5761         if (err != 0)
5762                 return err;
5763         if (!recover_lost_locks) {
5764                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5765                 return 0;
5766         }
5767         do {
5768                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5769                         return 0;
5770                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5771                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5772                 switch (err) {
5773                 default:
5774                         goto out;
5775                 case -NFS4ERR_GRACE:
5776                 case -NFS4ERR_DELAY:
5777                         nfs4_handle_exception(server, err, &exception);
5778                         err = 0;
5779                 }
5780         } while (exception.retry);
5781 out:
5782         return err;
5783 }
5784
5785 #if defined(CONFIG_NFS_V4_1)
5786 /**
5787  * nfs41_check_expired_locks - possibly free a lock stateid
5788  *
5789  * @state: NFSv4 state for an inode
5790  *
5791  * Returns NFS_OK if recovery for this stateid is now finished.
5792  * Otherwise a negative NFS4ERR value is returned.
5793  */
5794 static int nfs41_check_expired_locks(struct nfs4_state *state)
5795 {
5796         int status, ret = -NFS4ERR_BAD_STATEID;
5797         struct nfs4_lock_state *lsp;
5798         struct nfs_server *server = NFS_SERVER(state->inode);
5799
5800         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5801                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5802                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5803
5804                         status = nfs41_test_stateid(server,
5805                                         &lsp->ls_stateid,
5806                                         cred);
5807                         trace_nfs4_test_lock_stateid(state, lsp, status);
5808                         if (status != NFS_OK) {
5809                                 /* Free the stateid unless the server
5810                                  * informs us the stateid is unrecognized. */
5811                                 if (status != -NFS4ERR_BAD_STATEID)
5812                                         nfs41_free_stateid(server,
5813                                                         &lsp->ls_stateid,
5814                                                         cred);
5815                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5816                                 ret = status;
5817                         }
5818                 }
5819         };
5820
5821         return ret;
5822 }
5823
5824 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5825 {
5826         int status = NFS_OK;
5827
5828         if (test_bit(LK_STATE_IN_USE, &state->flags))
5829                 status = nfs41_check_expired_locks(state);
5830         if (status != NFS_OK)
5831                 status = nfs4_lock_expired(state, request);
5832         return status;
5833 }
5834 #endif
5835
5836 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5837 {
5838         struct nfs4_state_owner *sp = state->owner;
5839         struct nfs_inode *nfsi = NFS_I(state->inode);
5840         unsigned char fl_flags = request->fl_flags;
5841         unsigned int seq;
5842         int status = -ENOLCK;
5843
5844         if ((fl_flags & FL_POSIX) &&
5845                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5846                 goto out;
5847         /* Is this a delegated open? */
5848         status = nfs4_set_lock_state(state, request);
5849         if (status != 0)
5850                 goto out;
5851         request->fl_flags |= FL_ACCESS;
5852         status = do_vfs_lock(request->fl_file, request);
5853         if (status < 0)
5854                 goto out;
5855         down_read(&nfsi->rwsem);
5856         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5857                 /* Yes: cache locks! */
5858                 /* ...but avoid races with delegation recall... */
5859                 request->fl_flags = fl_flags & ~FL_SLEEP;
5860                 status = do_vfs_lock(request->fl_file, request);
5861                 goto out_unlock;
5862         }
5863         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5864         up_read(&nfsi->rwsem);
5865         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5866         if (status != 0)
5867                 goto out;
5868         down_read(&nfsi->rwsem);
5869         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5870                 status = -NFS4ERR_DELAY;
5871                 goto out_unlock;
5872         }
5873         /* Note: we always want to sleep here! */
5874         request->fl_flags = fl_flags | FL_SLEEP;
5875         if (do_vfs_lock(request->fl_file, request) < 0)
5876                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5877                         "manager!\n", __func__);
5878 out_unlock:
5879         up_read(&nfsi->rwsem);
5880 out:
5881         request->fl_flags = fl_flags;
5882         return status;
5883 }
5884
5885 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5886 {
5887         struct nfs4_exception exception = {
5888                 .state = state,
5889                 .inode = state->inode,
5890         };
5891         int err;
5892
5893         do {
5894                 err = _nfs4_proc_setlk(state, cmd, request);
5895                 trace_nfs4_set_lock(request, state, cmd, err);
5896                 if (err == -NFS4ERR_DENIED)
5897                         err = -EAGAIN;
5898                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5899                                 err, &exception);
5900         } while (exception.retry);
5901         return err;
5902 }
5903
5904 static int
5905 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5906 {
5907         struct nfs_open_context *ctx;
5908         struct nfs4_state *state;
5909         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5910         int status;
5911
5912         /* verify open state */
5913         ctx = nfs_file_open_context(filp);
5914         state = ctx->state;
5915
5916         if (request->fl_start < 0 || request->fl_end < 0)
5917                 return -EINVAL;
5918
5919         if (IS_GETLK(cmd)) {
5920                 if (state != NULL)
5921                         return nfs4_proc_getlk(state, F_GETLK, request);
5922                 return 0;
5923         }
5924
5925         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5926                 return -EINVAL;
5927
5928         if (request->fl_type == F_UNLCK) {
5929                 if (state != NULL)
5930                         return nfs4_proc_unlck(state, cmd, request);
5931                 return 0;
5932         }
5933
5934         if (state == NULL)
5935                 return -ENOLCK;
5936         /*
5937          * Don't rely on the VFS having checked the file open mode,
5938          * since it won't do this for flock() locks.
5939          */
5940         switch (request->fl_type) {
5941         case F_RDLCK:
5942                 if (!(filp->f_mode & FMODE_READ))
5943                         return -EBADF;
5944                 break;
5945         case F_WRLCK:
5946                 if (!(filp->f_mode & FMODE_WRITE))
5947                         return -EBADF;
5948         }
5949
5950         do {
5951                 status = nfs4_proc_setlk(state, cmd, request);
5952                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5953                         break;
5954                 timeout = nfs4_set_lock_task_retry(timeout);
5955                 status = -ERESTARTSYS;
5956                 if (signalled())
5957                         break;
5958         } while(status < 0);
5959         return status;
5960 }
5961
5962 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5963 {
5964         struct nfs_server *server = NFS_SERVER(state->inode);
5965         int err;
5966
5967         err = nfs4_set_lock_state(state, fl);
5968         if (err != 0)
5969                 return err;
5970         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5971         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5972 }
5973
5974 struct nfs_release_lockowner_data {
5975         struct nfs4_lock_state *lsp;
5976         struct nfs_server *server;
5977         struct nfs_release_lockowner_args args;
5978         struct nfs_release_lockowner_res res;
5979         unsigned long timestamp;
5980 };
5981
5982 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5983 {
5984         struct nfs_release_lockowner_data *data = calldata;
5985         struct nfs_server *server = data->server;
5986         nfs40_setup_sequence(server, &data->args.seq_args,
5987                                 &data->res.seq_res, task);
5988         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5989         data->timestamp = jiffies;
5990 }
5991
5992 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5993 {
5994         struct nfs_release_lockowner_data *data = calldata;
5995         struct nfs_server *server = data->server;
5996
5997         nfs40_sequence_done(task, &data->res.seq_res);
5998
5999         switch (task->tk_status) {
6000         case 0:
6001                 renew_lease(server, data->timestamp);
6002                 break;
6003         case -NFS4ERR_STALE_CLIENTID:
6004         case -NFS4ERR_EXPIRED:
6005                 nfs4_schedule_lease_recovery(server->nfs_client);
6006                 break;
6007         case -NFS4ERR_LEASE_MOVED:
6008         case -NFS4ERR_DELAY:
6009                 if (nfs4_async_handle_error(task, server,
6010                                             NULL, NULL) == -EAGAIN)
6011                         rpc_restart_call_prepare(task);
6012         }
6013 }
6014
6015 static void nfs4_release_lockowner_release(void *calldata)
6016 {
6017         struct nfs_release_lockowner_data *data = calldata;
6018         nfs4_free_lock_state(data->server, data->lsp);
6019         kfree(calldata);
6020 }
6021
6022 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6023         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6024         .rpc_call_done = nfs4_release_lockowner_done,
6025         .rpc_release = nfs4_release_lockowner_release,
6026 };
6027
6028 static void
6029 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6030 {
6031         struct nfs_release_lockowner_data *data;
6032         struct rpc_message msg = {
6033                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6034         };
6035
6036         if (server->nfs_client->cl_mvops->minor_version != 0)
6037                 return;
6038
6039         data = kmalloc(sizeof(*data), GFP_NOFS);
6040         if (!data)
6041                 return;
6042         data->lsp = lsp;
6043         data->server = server;
6044         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6045         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6046         data->args.lock_owner.s_dev = server->s_dev;
6047
6048         msg.rpc_argp = &data->args;
6049         msg.rpc_resp = &data->res;
6050         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6051         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6052 }
6053
6054 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6055
6056 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6057                                    const void *buf, size_t buflen,
6058                                    int flags, int type)
6059 {
6060         if (strcmp(key, "") != 0)
6061                 return -EINVAL;
6062
6063         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6064 }
6065
6066 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6067                                    void *buf, size_t buflen, int type)
6068 {
6069         if (strcmp(key, "") != 0)
6070                 return -EINVAL;
6071
6072         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6073 }
6074
6075 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6076                                        size_t list_len, const char *name,
6077                                        size_t name_len, int type)
6078 {
6079         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6080
6081         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6082                 return 0;
6083
6084         if (list && len <= list_len)
6085                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6086         return len;
6087 }
6088
6089 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6090 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6091 {
6092         return server->caps & NFS_CAP_SECURITY_LABEL;
6093 }
6094
6095 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6096                                    const void *buf, size_t buflen,
6097                                    int flags, int type)
6098 {
6099         if (security_ismaclabel(key))
6100                 return nfs4_set_security_label(dentry, buf, buflen);
6101
6102         return -EOPNOTSUPP;
6103 }
6104
6105 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6106                                    void *buf, size_t buflen, int type)
6107 {
6108         if (security_ismaclabel(key))
6109                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6110         return -EOPNOTSUPP;
6111 }
6112
6113 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6114                                        size_t list_len, const char *name,
6115                                        size_t name_len, int type)
6116 {
6117         size_t len = 0;
6118
6119         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6120                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6121                 if (list && len <= list_len)
6122                         security_inode_listsecurity(dentry->d_inode, list, len);
6123         }
6124         return len;
6125 }
6126
6127 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6128         .prefix = XATTR_SECURITY_PREFIX,
6129         .list   = nfs4_xattr_list_nfs4_label,
6130         .get    = nfs4_xattr_get_nfs4_label,
6131         .set    = nfs4_xattr_set_nfs4_label,
6132 };
6133 #endif
6134
6135
6136 /*
6137  * nfs_fhget will use either the mounted_on_fileid or the fileid
6138  */
6139 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6140 {
6141         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6142                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6143               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6144               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6145                 return;
6146
6147         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6148                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6149         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6150         fattr->nlink = 2;
6151 }
6152
6153 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6154                                    const struct qstr *name,
6155                                    struct nfs4_fs_locations *fs_locations,
6156                                    struct page *page)
6157 {
6158         struct nfs_server *server = NFS_SERVER(dir);
6159         u32 bitmask[3] = {
6160                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6161         };
6162         struct nfs4_fs_locations_arg args = {
6163                 .dir_fh = NFS_FH(dir),
6164                 .name = name,
6165                 .page = page,
6166                 .bitmask = bitmask,
6167         };
6168         struct nfs4_fs_locations_res res = {
6169                 .fs_locations = fs_locations,
6170         };
6171         struct rpc_message msg = {
6172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6173                 .rpc_argp = &args,
6174                 .rpc_resp = &res,
6175         };
6176         int status;
6177
6178         dprintk("%s: start\n", __func__);
6179
6180         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6181          * is not supported */
6182         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6183                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6184         else
6185                 bitmask[0] |= FATTR4_WORD0_FILEID;
6186
6187         nfs_fattr_init(&fs_locations->fattr);
6188         fs_locations->server = server;
6189         fs_locations->nlocations = 0;
6190         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6191         dprintk("%s: returned status = %d\n", __func__, status);
6192         return status;
6193 }
6194
6195 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6196                            const struct qstr *name,
6197                            struct nfs4_fs_locations *fs_locations,
6198                            struct page *page)
6199 {
6200         struct nfs4_exception exception = { };
6201         int err;
6202         do {
6203                 err = _nfs4_proc_fs_locations(client, dir, name,
6204                                 fs_locations, page);
6205                 trace_nfs4_get_fs_locations(dir, name, err);
6206                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6207                                 &exception);
6208         } while (exception.retry);
6209         return err;
6210 }
6211
6212 /*
6213  * This operation also signals the server that this client is
6214  * performing migration recovery.  The server can stop returning
6215  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6216  * appended to this compound to identify the client ID which is
6217  * performing recovery.
6218  */
6219 static int _nfs40_proc_get_locations(struct inode *inode,
6220                                      struct nfs4_fs_locations *locations,
6221                                      struct page *page, struct rpc_cred *cred)
6222 {
6223         struct nfs_server *server = NFS_SERVER(inode);
6224         struct rpc_clnt *clnt = server->client;
6225         u32 bitmask[2] = {
6226                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6227         };
6228         struct nfs4_fs_locations_arg args = {
6229                 .clientid       = server->nfs_client->cl_clientid,
6230                 .fh             = NFS_FH(inode),
6231                 .page           = page,
6232                 .bitmask        = bitmask,
6233                 .migration      = 1,            /* skip LOOKUP */
6234                 .renew          = 1,            /* append RENEW */
6235         };
6236         struct nfs4_fs_locations_res res = {
6237                 .fs_locations   = locations,
6238                 .migration      = 1,
6239                 .renew          = 1,
6240         };
6241         struct rpc_message msg = {
6242                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6243                 .rpc_argp       = &args,
6244                 .rpc_resp       = &res,
6245                 .rpc_cred       = cred,
6246         };
6247         unsigned long now = jiffies;
6248         int status;
6249
6250         nfs_fattr_init(&locations->fattr);
6251         locations->server = server;
6252         locations->nlocations = 0;
6253
6254         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6255         nfs4_set_sequence_privileged(&args.seq_args);
6256         status = nfs4_call_sync_sequence(clnt, server, &msg,
6257                                         &args.seq_args, &res.seq_res);
6258         if (status)
6259                 return status;
6260
6261         renew_lease(server, now);
6262         return 0;
6263 }
6264
6265 #ifdef CONFIG_NFS_V4_1
6266
6267 /*
6268  * This operation also signals the server that this client is
6269  * performing migration recovery.  The server can stop asserting
6270  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6271  * performing this operation is identified in the SEQUENCE
6272  * operation in this compound.
6273  *
6274  * When the client supports GETATTR(fs_locations_info), it can
6275  * be plumbed in here.
6276  */
6277 static int _nfs41_proc_get_locations(struct inode *inode,
6278                                      struct nfs4_fs_locations *locations,
6279                                      struct page *page, struct rpc_cred *cred)
6280 {
6281         struct nfs_server *server = NFS_SERVER(inode);
6282         struct rpc_clnt *clnt = server->client;
6283         u32 bitmask[2] = {
6284                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6285         };
6286         struct nfs4_fs_locations_arg args = {
6287                 .fh             = NFS_FH(inode),
6288                 .page           = page,
6289                 .bitmask        = bitmask,
6290                 .migration      = 1,            /* skip LOOKUP */
6291         };
6292         struct nfs4_fs_locations_res res = {
6293                 .fs_locations   = locations,
6294                 .migration      = 1,
6295         };
6296         struct rpc_message msg = {
6297                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6298                 .rpc_argp       = &args,
6299                 .rpc_resp       = &res,
6300                 .rpc_cred       = cred,
6301         };
6302         int status;
6303
6304         nfs_fattr_init(&locations->fattr);
6305         locations->server = server;
6306         locations->nlocations = 0;
6307
6308         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6309         nfs4_set_sequence_privileged(&args.seq_args);
6310         status = nfs4_call_sync_sequence(clnt, server, &msg,
6311                                         &args.seq_args, &res.seq_res);
6312         if (status == NFS4_OK &&
6313             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6314                 status = -NFS4ERR_LEASE_MOVED;
6315         return status;
6316 }
6317
6318 #endif  /* CONFIG_NFS_V4_1 */
6319
6320 /**
6321  * nfs4_proc_get_locations - discover locations for a migrated FSID
6322  * @inode: inode on FSID that is migrating
6323  * @locations: result of query
6324  * @page: buffer
6325  * @cred: credential to use for this operation
6326  *
6327  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6328  * operation failed, or a negative errno if a local error occurred.
6329  *
6330  * On success, "locations" is filled in, but if the server has
6331  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6332  * asserted.
6333  *
6334  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6335  * from this client that require migration recovery.
6336  */
6337 int nfs4_proc_get_locations(struct inode *inode,
6338                             struct nfs4_fs_locations *locations,
6339                             struct page *page, struct rpc_cred *cred)
6340 {
6341         struct nfs_server *server = NFS_SERVER(inode);
6342         struct nfs_client *clp = server->nfs_client;
6343         const struct nfs4_mig_recovery_ops *ops =
6344                                         clp->cl_mvops->mig_recovery_ops;
6345         struct nfs4_exception exception = { };
6346         int status;
6347
6348         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6349                 (unsigned long long)server->fsid.major,
6350                 (unsigned long long)server->fsid.minor,
6351                 clp->cl_hostname);
6352         nfs_display_fhandle(NFS_FH(inode), __func__);
6353
6354         do {
6355                 status = ops->get_locations(inode, locations, page, cred);
6356                 if (status != -NFS4ERR_DELAY)
6357                         break;
6358                 nfs4_handle_exception(server, status, &exception);
6359         } while (exception.retry);
6360         return status;
6361 }
6362
6363 /*
6364  * This operation also signals the server that this client is
6365  * performing "lease moved" recovery.  The server can stop
6366  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6367  * is appended to this compound to identify the client ID which is
6368  * performing recovery.
6369  */
6370 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6371 {
6372         struct nfs_server *server = NFS_SERVER(inode);
6373         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6374         struct rpc_clnt *clnt = server->client;
6375         struct nfs4_fsid_present_arg args = {
6376                 .fh             = NFS_FH(inode),
6377                 .clientid       = clp->cl_clientid,
6378                 .renew          = 1,            /* append RENEW */
6379         };
6380         struct nfs4_fsid_present_res res = {
6381                 .renew          = 1,
6382         };
6383         struct rpc_message msg = {
6384                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6385                 .rpc_argp       = &args,
6386                 .rpc_resp       = &res,
6387                 .rpc_cred       = cred,
6388         };
6389         unsigned long now = jiffies;
6390         int status;
6391
6392         res.fh = nfs_alloc_fhandle();
6393         if (res.fh == NULL)
6394                 return -ENOMEM;
6395
6396         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6397         nfs4_set_sequence_privileged(&args.seq_args);
6398         status = nfs4_call_sync_sequence(clnt, server, &msg,
6399                                                 &args.seq_args, &res.seq_res);
6400         nfs_free_fhandle(res.fh);
6401         if (status)
6402                 return status;
6403
6404         do_renew_lease(clp, now);
6405         return 0;
6406 }
6407
6408 #ifdef CONFIG_NFS_V4_1
6409
6410 /*
6411  * This operation also signals the server that this client is
6412  * performing "lease moved" recovery.  The server can stop asserting
6413  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6414  * this operation is identified in the SEQUENCE operation in this
6415  * compound.
6416  */
6417 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6418 {
6419         struct nfs_server *server = NFS_SERVER(inode);
6420         struct rpc_clnt *clnt = server->client;
6421         struct nfs4_fsid_present_arg args = {
6422                 .fh             = NFS_FH(inode),
6423         };
6424         struct nfs4_fsid_present_res res = {
6425         };
6426         struct rpc_message msg = {
6427                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6428                 .rpc_argp       = &args,
6429                 .rpc_resp       = &res,
6430                 .rpc_cred       = cred,
6431         };
6432         int status;
6433
6434         res.fh = nfs_alloc_fhandle();
6435         if (res.fh == NULL)
6436                 return -ENOMEM;
6437
6438         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6439         nfs4_set_sequence_privileged(&args.seq_args);
6440         status = nfs4_call_sync_sequence(clnt, server, &msg,
6441                                                 &args.seq_args, &res.seq_res);
6442         nfs_free_fhandle(res.fh);
6443         if (status == NFS4_OK &&
6444             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6445                 status = -NFS4ERR_LEASE_MOVED;
6446         return status;
6447 }
6448
6449 #endif  /* CONFIG_NFS_V4_1 */
6450
6451 /**
6452  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6453  * @inode: inode on FSID to check
6454  * @cred: credential to use for this operation
6455  *
6456  * Server indicates whether the FSID is present, moved, or not
6457  * recognized.  This operation is necessary to clear a LEASE_MOVED
6458  * condition for this client ID.
6459  *
6460  * Returns NFS4_OK if the FSID is present on this server,
6461  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6462  *  NFS4ERR code if some error occurred on the server, or a
6463  *  negative errno if a local failure occurred.
6464  */
6465 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6466 {
6467         struct nfs_server *server = NFS_SERVER(inode);
6468         struct nfs_client *clp = server->nfs_client;
6469         const struct nfs4_mig_recovery_ops *ops =
6470                                         clp->cl_mvops->mig_recovery_ops;
6471         struct nfs4_exception exception = { };
6472         int status;
6473
6474         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6475                 (unsigned long long)server->fsid.major,
6476                 (unsigned long long)server->fsid.minor,
6477                 clp->cl_hostname);
6478         nfs_display_fhandle(NFS_FH(inode), __func__);
6479
6480         do {
6481                 status = ops->fsid_present(inode, cred);
6482                 if (status != -NFS4ERR_DELAY)
6483                         break;
6484                 nfs4_handle_exception(server, status, &exception);
6485         } while (exception.retry);
6486         return status;
6487 }
6488
6489 /**
6490  * If 'use_integrity' is true and the state managment nfs_client
6491  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6492  * and the machine credential as per RFC3530bis and RFC5661 Security
6493  * Considerations sections. Otherwise, just use the user cred with the
6494  * filesystem's rpc_client.
6495  */
6496 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6497 {
6498         int status;
6499         struct nfs4_secinfo_arg args = {
6500                 .dir_fh = NFS_FH(dir),
6501                 .name   = name,
6502         };
6503         struct nfs4_secinfo_res res = {
6504                 .flavors     = flavors,
6505         };
6506         struct rpc_message msg = {
6507                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6508                 .rpc_argp = &args,
6509                 .rpc_resp = &res,
6510         };
6511         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6512         struct rpc_cred *cred = NULL;
6513
6514         if (use_integrity) {
6515                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6516                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6517                 msg.rpc_cred = cred;
6518         }
6519
6520         dprintk("NFS call  secinfo %s\n", name->name);
6521
6522         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6523                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6524
6525         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6526                                 &res.seq_res, 0);
6527         dprintk("NFS reply  secinfo: %d\n", status);
6528
6529         if (cred)
6530                 put_rpccred(cred);
6531
6532         return status;
6533 }
6534
6535 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6536                       struct nfs4_secinfo_flavors *flavors)
6537 {
6538         struct nfs4_exception exception = { };
6539         int err;
6540         do {
6541                 err = -NFS4ERR_WRONGSEC;
6542
6543                 /* try to use integrity protection with machine cred */
6544                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6545                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6546
6547                 /*
6548                  * if unable to use integrity protection, or SECINFO with
6549                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6550                  * disallowed by spec, but exists in deployed servers) use
6551                  * the current filesystem's rpc_client and the user cred.
6552                  */
6553                 if (err == -NFS4ERR_WRONGSEC)
6554                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6555
6556                 trace_nfs4_secinfo(dir, name, err);
6557                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6558                                 &exception);
6559         } while (exception.retry);
6560         return err;
6561 }
6562
6563 #ifdef CONFIG_NFS_V4_1
6564 /*
6565  * Check the exchange flags returned by the server for invalid flags, having
6566  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6567  * DS flags set.
6568  */
6569 static int nfs4_check_cl_exchange_flags(u32 flags)
6570 {
6571         if (flags & ~EXCHGID4_FLAG_MASK_R)
6572                 goto out_inval;
6573         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6574             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6575                 goto out_inval;
6576         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6577                 goto out_inval;
6578         return NFS_OK;
6579 out_inval:
6580         return -NFS4ERR_INVAL;
6581 }
6582
6583 static bool
6584 nfs41_same_server_scope(struct nfs41_server_scope *a,
6585                         struct nfs41_server_scope *b)
6586 {
6587         if (a->server_scope_sz == b->server_scope_sz &&
6588             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6589                 return true;
6590
6591         return false;
6592 }
6593
6594 /*
6595  * nfs4_proc_bind_conn_to_session()
6596  *
6597  * The 4.1 client currently uses the same TCP connection for the
6598  * fore and backchannel.
6599  */
6600 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6601 {
6602         int status;
6603         struct nfs41_bind_conn_to_session_res res;
6604         struct rpc_message msg = {
6605                 .rpc_proc =
6606                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6607                 .rpc_argp = clp,
6608                 .rpc_resp = &res,
6609                 .rpc_cred = cred,
6610         };
6611
6612         dprintk("--> %s\n", __func__);
6613
6614         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6615         if (unlikely(res.session == NULL)) {
6616                 status = -ENOMEM;
6617                 goto out;
6618         }
6619
6620         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6621         trace_nfs4_bind_conn_to_session(clp, status);
6622         if (status == 0) {
6623                 if (memcmp(res.session->sess_id.data,
6624                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6625                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6626                         status = -EIO;
6627                         goto out_session;
6628                 }
6629                 if (res.dir != NFS4_CDFS4_BOTH) {
6630                         dprintk("NFS: %s: Unexpected direction from server\n",
6631                                 __func__);
6632                         status = -EIO;
6633                         goto out_session;
6634                 }
6635                 if (res.use_conn_in_rdma_mode) {
6636                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6637                                 __func__);
6638                         status = -EIO;
6639                         goto out_session;
6640                 }
6641         }
6642 out_session:
6643         kfree(res.session);
6644 out:
6645         dprintk("<-- %s status= %d\n", __func__, status);
6646         return status;
6647 }
6648
6649 /*
6650  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6651  * and operations we'd like to see to enable certain features in the allow map
6652  */
6653 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6654         .how = SP4_MACH_CRED,
6655         .enforce.u.words = {
6656                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6657                       1 << (OP_EXCHANGE_ID - 32) |
6658                       1 << (OP_CREATE_SESSION - 32) |
6659                       1 << (OP_DESTROY_SESSION - 32) |
6660                       1 << (OP_DESTROY_CLIENTID - 32)
6661         },
6662         .allow.u.words = {
6663                 [0] = 1 << (OP_CLOSE) |
6664                       1 << (OP_LOCKU) |
6665                       1 << (OP_COMMIT),
6666                 [1] = 1 << (OP_SECINFO - 32) |
6667                       1 << (OP_SECINFO_NO_NAME - 32) |
6668                       1 << (OP_TEST_STATEID - 32) |
6669                       1 << (OP_FREE_STATEID - 32) |
6670                       1 << (OP_WRITE - 32)
6671         }
6672 };
6673
6674 /*
6675  * Select the state protection mode for client `clp' given the server results
6676  * from exchange_id in `sp'.
6677  *
6678  * Returns 0 on success, negative errno otherwise.
6679  */
6680 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6681                                  struct nfs41_state_protection *sp)
6682 {
6683         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6684                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6685                       1 << (OP_EXCHANGE_ID - 32) |
6686                       1 << (OP_CREATE_SESSION - 32) |
6687                       1 << (OP_DESTROY_SESSION - 32) |
6688                       1 << (OP_DESTROY_CLIENTID - 32)
6689         };
6690         unsigned int i;
6691
6692         if (sp->how == SP4_MACH_CRED) {
6693                 /* Print state protect result */
6694                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6695                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6696                         if (test_bit(i, sp->enforce.u.longs))
6697                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6698                         if (test_bit(i, sp->allow.u.longs))
6699                                 dfprintk(MOUNT, "  allow op %d\n", i);
6700                 }
6701
6702                 /* make sure nothing is on enforce list that isn't supported */
6703                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6704                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6705                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6706                                 return -EINVAL;
6707                         }
6708                 }
6709
6710                 /*
6711                  * Minimal mode - state operations are allowed to use machine
6712                  * credential.  Note this already happens by default, so the
6713                  * client doesn't have to do anything more than the negotiation.
6714                  *
6715                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6716                  *       we're already using the machine cred for exchange_id
6717                  *       and will never use a different cred.
6718                  */
6719                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6720                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6721                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6722                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6723                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6724                         dfprintk(MOUNT, "  minimal mode enabled\n");
6725                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6726                 } else {
6727                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6728                         return -EINVAL;
6729                 }
6730
6731                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6732                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6733                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6734                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6735                 }
6736
6737                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6738                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6739                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6740                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6741                 }
6742
6743                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6744                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6745                         dfprintk(MOUNT, "  stateid mode enabled\n");
6746                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6747                 }
6748
6749                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6750                         dfprintk(MOUNT, "  write mode enabled\n");
6751                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6752                 }
6753
6754                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6755                         dfprintk(MOUNT, "  commit mode enabled\n");
6756                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6757                 }
6758         }
6759
6760         return 0;
6761 }
6762
6763 /*
6764  * _nfs4_proc_exchange_id()
6765  *
6766  * Wrapper for EXCHANGE_ID operation.
6767  */
6768 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6769         u32 sp4_how)
6770 {
6771         nfs4_verifier verifier;
6772         struct nfs41_exchange_id_args args = {
6773                 .verifier = &verifier,
6774                 .client = clp,
6775 #ifdef CONFIG_NFS_V4_1_MIGRATION
6776                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6777                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6778                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6779 #else
6780                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6781                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6782 #endif
6783         };
6784         struct nfs41_exchange_id_res res = {
6785                 0
6786         };
6787         int status;
6788         struct rpc_message msg = {
6789                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6790                 .rpc_argp = &args,
6791                 .rpc_resp = &res,
6792                 .rpc_cred = cred,
6793         };
6794
6795         nfs4_init_boot_verifier(clp, &verifier);
6796         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6797                                                         sizeof(args.id));
6798         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6799                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6800                 args.id_len, args.id);
6801
6802         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6803                                         GFP_NOFS);
6804         if (unlikely(res.server_owner == NULL)) {
6805                 status = -ENOMEM;
6806                 goto out;
6807         }
6808
6809         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6810                                         GFP_NOFS);
6811         if (unlikely(res.server_scope == NULL)) {
6812                 status = -ENOMEM;
6813                 goto out_server_owner;
6814         }
6815
6816         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6817         if (unlikely(res.impl_id == NULL)) {
6818                 status = -ENOMEM;
6819                 goto out_server_scope;
6820         }
6821
6822         switch (sp4_how) {
6823         case SP4_NONE:
6824                 args.state_protect.how = SP4_NONE;
6825                 break;
6826
6827         case SP4_MACH_CRED:
6828                 args.state_protect = nfs4_sp4_mach_cred_request;
6829                 break;
6830
6831         default:
6832                 /* unsupported! */
6833                 WARN_ON_ONCE(1);
6834                 status = -EINVAL;
6835                 goto out_server_scope;
6836         }
6837
6838         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6839         trace_nfs4_exchange_id(clp, status);
6840         if (status == 0)
6841                 status = nfs4_check_cl_exchange_flags(res.flags);
6842
6843         if (status == 0)
6844                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6845
6846         if (status == 0) {
6847                 clp->cl_clientid = res.clientid;
6848                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6849                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6850                         clp->cl_seqid = res.seqid;
6851
6852                 kfree(clp->cl_serverowner);
6853                 clp->cl_serverowner = res.server_owner;
6854                 res.server_owner = NULL;
6855
6856                 /* use the most recent implementation id */
6857                 kfree(clp->cl_implid);
6858                 clp->cl_implid = res.impl_id;
6859
6860                 if (clp->cl_serverscope != NULL &&
6861                     !nfs41_same_server_scope(clp->cl_serverscope,
6862                                              res.server_scope)) {
6863                         dprintk("%s: server_scope mismatch detected\n",
6864                                 __func__);
6865                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6866                         kfree(clp->cl_serverscope);
6867                         clp->cl_serverscope = NULL;
6868                 }
6869
6870                 if (clp->cl_serverscope == NULL) {
6871                         clp->cl_serverscope = res.server_scope;
6872                         goto out;
6873                 }
6874         } else
6875                 kfree(res.impl_id);
6876
6877 out_server_owner:
6878         kfree(res.server_owner);
6879 out_server_scope:
6880         kfree(res.server_scope);
6881 out:
6882         if (clp->cl_implid != NULL)
6883                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6884                         "domain: %s, name: %s, date: %llu,%u\n",
6885                         clp->cl_implid->domain, clp->cl_implid->name,
6886                         clp->cl_implid->date.seconds,
6887                         clp->cl_implid->date.nseconds);
6888         dprintk("NFS reply exchange_id: %d\n", status);
6889         return status;
6890 }
6891
6892 /*
6893  * nfs4_proc_exchange_id()
6894  *
6895  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6896  *
6897  * Since the clientid has expired, all compounds using sessions
6898  * associated with the stale clientid will be returning
6899  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6900  * be in some phase of session reset.
6901  *
6902  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6903  */
6904 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6905 {
6906         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6907         int status;
6908
6909         /* try SP4_MACH_CRED if krb5i/p */
6910         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6911             authflavor == RPC_AUTH_GSS_KRB5P) {
6912                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6913                 if (!status)
6914                         return 0;
6915         }
6916
6917         /* try SP4_NONE */
6918         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6919 }
6920
6921 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6922                 struct rpc_cred *cred)
6923 {
6924         struct rpc_message msg = {
6925                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6926                 .rpc_argp = clp,
6927                 .rpc_cred = cred,
6928         };
6929         int status;
6930
6931         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6932         trace_nfs4_destroy_clientid(clp, status);
6933         if (status)
6934                 dprintk("NFS: Got error %d from the server %s on "
6935                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6936         return status;
6937 }
6938
6939 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6940                 struct rpc_cred *cred)
6941 {
6942         unsigned int loop;
6943         int ret;
6944
6945         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6946                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6947                 switch (ret) {
6948                 case -NFS4ERR_DELAY:
6949                 case -NFS4ERR_CLIENTID_BUSY:
6950                         ssleep(1);
6951                         break;
6952                 default:
6953                         return ret;
6954                 }
6955         }
6956         return 0;
6957 }
6958
6959 int nfs4_destroy_clientid(struct nfs_client *clp)
6960 {
6961         struct rpc_cred *cred;
6962         int ret = 0;
6963
6964         if (clp->cl_mvops->minor_version < 1)
6965                 goto out;
6966         if (clp->cl_exchange_flags == 0)
6967                 goto out;
6968         if (clp->cl_preserve_clid)
6969                 goto out;
6970         cred = nfs4_get_clid_cred(clp);
6971         ret = nfs4_proc_destroy_clientid(clp, cred);
6972         if (cred)
6973                 put_rpccred(cred);
6974         switch (ret) {
6975         case 0:
6976         case -NFS4ERR_STALE_CLIENTID:
6977                 clp->cl_exchange_flags = 0;
6978         }
6979 out:
6980         return ret;
6981 }
6982
6983 struct nfs4_get_lease_time_data {
6984         struct nfs4_get_lease_time_args *args;
6985         struct nfs4_get_lease_time_res *res;
6986         struct nfs_client *clp;
6987 };
6988
6989 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6990                                         void *calldata)
6991 {
6992         struct nfs4_get_lease_time_data *data =
6993                         (struct nfs4_get_lease_time_data *)calldata;
6994
6995         dprintk("--> %s\n", __func__);
6996         /* just setup sequence, do not trigger session recovery
6997            since we're invoked within one */
6998         nfs41_setup_sequence(data->clp->cl_session,
6999                         &data->args->la_seq_args,
7000                         &data->res->lr_seq_res,
7001                         task);
7002         dprintk("<-- %s\n", __func__);
7003 }
7004
7005 /*
7006  * Called from nfs4_state_manager thread for session setup, so don't recover
7007  * from sequence operation or clientid errors.
7008  */
7009 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7010 {
7011         struct nfs4_get_lease_time_data *data =
7012                         (struct nfs4_get_lease_time_data *)calldata;
7013
7014         dprintk("--> %s\n", __func__);
7015         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7016                 return;
7017         switch (task->tk_status) {
7018         case -NFS4ERR_DELAY:
7019         case -NFS4ERR_GRACE:
7020                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7021                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7022                 task->tk_status = 0;
7023                 /* fall through */
7024         case -NFS4ERR_RETRY_UNCACHED_REP:
7025                 rpc_restart_call_prepare(task);
7026                 return;
7027         }
7028         dprintk("<-- %s\n", __func__);
7029 }
7030
7031 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7032         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7033         .rpc_call_done = nfs4_get_lease_time_done,
7034 };
7035
7036 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7037 {
7038         struct rpc_task *task;
7039         struct nfs4_get_lease_time_args args;
7040         struct nfs4_get_lease_time_res res = {
7041                 .lr_fsinfo = fsinfo,
7042         };
7043         struct nfs4_get_lease_time_data data = {
7044                 .args = &args,
7045                 .res = &res,
7046                 .clp = clp,
7047         };
7048         struct rpc_message msg = {
7049                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7050                 .rpc_argp = &args,
7051                 .rpc_resp = &res,
7052         };
7053         struct rpc_task_setup task_setup = {
7054                 .rpc_client = clp->cl_rpcclient,
7055                 .rpc_message = &msg,
7056                 .callback_ops = &nfs4_get_lease_time_ops,
7057                 .callback_data = &data,
7058                 .flags = RPC_TASK_TIMEOUT,
7059         };
7060         int status;
7061
7062         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7063         nfs4_set_sequence_privileged(&args.la_seq_args);
7064         dprintk("--> %s\n", __func__);
7065         task = rpc_run_task(&task_setup);
7066
7067         if (IS_ERR(task))
7068                 status = PTR_ERR(task);
7069         else {
7070                 status = task->tk_status;
7071                 rpc_put_task(task);
7072         }
7073         dprintk("<-- %s return %d\n", __func__, status);
7074
7075         return status;
7076 }
7077
7078 /*
7079  * Initialize the values to be used by the client in CREATE_SESSION
7080  * If nfs4_init_session set the fore channel request and response sizes,
7081  * use them.
7082  *
7083  * Set the back channel max_resp_sz_cached to zero to force the client to
7084  * always set csa_cachethis to FALSE because the current implementation
7085  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7086  */
7087 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7088 {
7089         unsigned int max_rqst_sz, max_resp_sz;
7090
7091         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7092         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7093
7094         /* Fore channel attributes */
7095         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7096         args->fc_attrs.max_resp_sz = max_resp_sz;
7097         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7098         args->fc_attrs.max_reqs = max_session_slots;
7099
7100         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7101                 "max_ops=%u max_reqs=%u\n",
7102                 __func__,
7103                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7104                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7105
7106         /* Back channel attributes */
7107         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7108         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7109         args->bc_attrs.max_resp_sz_cached = 0;
7110         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7111         args->bc_attrs.max_reqs = 1;
7112
7113         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7114                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7115                 __func__,
7116                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7117                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7118                 args->bc_attrs.max_reqs);
7119 }
7120
7121 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7122 {
7123         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7124         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7125
7126         if (rcvd->max_resp_sz > sent->max_resp_sz)
7127                 return -EINVAL;
7128         /*
7129          * Our requested max_ops is the minimum we need; we're not
7130          * prepared to break up compounds into smaller pieces than that.
7131          * So, no point even trying to continue if the server won't
7132          * cooperate:
7133          */
7134         if (rcvd->max_ops < sent->max_ops)
7135                 return -EINVAL;
7136         if (rcvd->max_reqs == 0)
7137                 return -EINVAL;
7138         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7139                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7140         return 0;
7141 }
7142
7143 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7144 {
7145         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7146         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7147
7148         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7149                 return -EINVAL;
7150         if (rcvd->max_resp_sz < sent->max_resp_sz)
7151                 return -EINVAL;
7152         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7153                 return -EINVAL;
7154         /* These would render the backchannel useless: */
7155         if (rcvd->max_ops != sent->max_ops)
7156                 return -EINVAL;
7157         if (rcvd->max_reqs != sent->max_reqs)
7158                 return -EINVAL;
7159         return 0;
7160 }
7161
7162 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7163                                      struct nfs4_session *session)
7164 {
7165         int ret;
7166
7167         ret = nfs4_verify_fore_channel_attrs(args, session);
7168         if (ret)
7169                 return ret;
7170         return nfs4_verify_back_channel_attrs(args, session);
7171 }
7172
7173 static int _nfs4_proc_create_session(struct nfs_client *clp,
7174                 struct rpc_cred *cred)
7175 {
7176         struct nfs4_session *session = clp->cl_session;
7177         struct nfs41_create_session_args args = {
7178                 .client = clp,
7179                 .cb_program = NFS4_CALLBACK,
7180         };
7181         struct nfs41_create_session_res res = {
7182                 .client = clp,
7183         };
7184         struct rpc_message msg = {
7185                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7186                 .rpc_argp = &args,
7187                 .rpc_resp = &res,
7188                 .rpc_cred = cred,
7189         };
7190         int status;
7191
7192         nfs4_init_channel_attrs(&args);
7193         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7194
7195         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7196         trace_nfs4_create_session(clp, status);
7197
7198         if (!status) {
7199                 /* Verify the session's negotiated channel_attrs values */
7200                 status = nfs4_verify_channel_attrs(&args, session);
7201                 /* Increment the clientid slot sequence id */
7202                 clp->cl_seqid++;
7203         }
7204
7205         return status;
7206 }
7207
7208 /*
7209  * Issues a CREATE_SESSION operation to the server.
7210  * It is the responsibility of the caller to verify the session is
7211  * expired before calling this routine.
7212  */
7213 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7214 {
7215         int status;
7216         unsigned *ptr;
7217         struct nfs4_session *session = clp->cl_session;
7218
7219         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7220
7221         status = _nfs4_proc_create_session(clp, cred);
7222         if (status)
7223                 goto out;
7224
7225         /* Init or reset the session slot tables */
7226         status = nfs4_setup_session_slot_tables(session);
7227         dprintk("slot table setup returned %d\n", status);
7228         if (status)
7229                 goto out;
7230
7231         ptr = (unsigned *)&session->sess_id.data[0];
7232         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7233                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7234 out:
7235         dprintk("<-- %s\n", __func__);
7236         return status;
7237 }
7238
7239 /*
7240  * Issue the over-the-wire RPC DESTROY_SESSION.
7241  * The caller must serialize access to this routine.
7242  */
7243 int nfs4_proc_destroy_session(struct nfs4_session *session,
7244                 struct rpc_cred *cred)
7245 {
7246         struct rpc_message msg = {
7247                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7248                 .rpc_argp = session,
7249                 .rpc_cred = cred,
7250         };
7251         int status = 0;
7252
7253         dprintk("--> nfs4_proc_destroy_session\n");
7254
7255         /* session is still being setup */
7256         if (session->clp->cl_cons_state != NFS_CS_READY)
7257                 return status;
7258
7259         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7260         trace_nfs4_destroy_session(session->clp, status);
7261
7262         if (status)
7263                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7264                         "Session has been destroyed regardless...\n", status);
7265
7266         dprintk("<-- nfs4_proc_destroy_session\n");
7267         return status;
7268 }
7269
7270 /*
7271  * Renew the cl_session lease.
7272  */
7273 struct nfs4_sequence_data {
7274         struct nfs_client *clp;
7275         struct nfs4_sequence_args args;
7276         struct nfs4_sequence_res res;
7277 };
7278
7279 static void nfs41_sequence_release(void *data)
7280 {
7281         struct nfs4_sequence_data *calldata = data;
7282         struct nfs_client *clp = calldata->clp;
7283
7284         if (atomic_read(&clp->cl_count) > 1)
7285                 nfs4_schedule_state_renewal(clp);
7286         nfs_put_client(clp);
7287         kfree(calldata);
7288 }
7289
7290 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7291 {
7292         switch(task->tk_status) {
7293         case -NFS4ERR_DELAY:
7294                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7295                 return -EAGAIN;
7296         default:
7297                 nfs4_schedule_lease_recovery(clp);
7298         }
7299         return 0;
7300 }
7301
7302 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7303 {
7304         struct nfs4_sequence_data *calldata = data;
7305         struct nfs_client *clp = calldata->clp;
7306
7307         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7308                 return;
7309
7310         trace_nfs4_sequence(clp, task->tk_status);
7311         if (task->tk_status < 0) {
7312                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7313                 if (atomic_read(&clp->cl_count) == 1)
7314                         goto out;
7315
7316                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7317                         rpc_restart_call_prepare(task);
7318                         return;
7319                 }
7320         }
7321         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7322 out:
7323         dprintk("<-- %s\n", __func__);
7324 }
7325
7326 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7327 {
7328         struct nfs4_sequence_data *calldata = data;
7329         struct nfs_client *clp = calldata->clp;
7330         struct nfs4_sequence_args *args;
7331         struct nfs4_sequence_res *res;
7332
7333         args = task->tk_msg.rpc_argp;
7334         res = task->tk_msg.rpc_resp;
7335
7336         nfs41_setup_sequence(clp->cl_session, args, res, task);
7337 }
7338
7339 static const struct rpc_call_ops nfs41_sequence_ops = {
7340         .rpc_call_done = nfs41_sequence_call_done,
7341         .rpc_call_prepare = nfs41_sequence_prepare,
7342         .rpc_release = nfs41_sequence_release,
7343 };
7344
7345 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7346                 struct rpc_cred *cred,
7347                 bool is_privileged)
7348 {
7349         struct nfs4_sequence_data *calldata;
7350         struct rpc_message msg = {
7351                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7352                 .rpc_cred = cred,
7353         };
7354         struct rpc_task_setup task_setup_data = {
7355                 .rpc_client = clp->cl_rpcclient,
7356                 .rpc_message = &msg,
7357                 .callback_ops = &nfs41_sequence_ops,
7358                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7359         };
7360
7361         if (!atomic_inc_not_zero(&clp->cl_count))
7362                 return ERR_PTR(-EIO);
7363         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7364         if (calldata == NULL) {
7365                 nfs_put_client(clp);
7366                 return ERR_PTR(-ENOMEM);
7367         }
7368         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7369         if (is_privileged)
7370                 nfs4_set_sequence_privileged(&calldata->args);
7371         msg.rpc_argp = &calldata->args;
7372         msg.rpc_resp = &calldata->res;
7373         calldata->clp = clp;
7374         task_setup_data.callback_data = calldata;
7375
7376         return rpc_run_task(&task_setup_data);
7377 }
7378
7379 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7380 {
7381         struct rpc_task *task;
7382         int ret = 0;
7383
7384         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7385                 return -EAGAIN;
7386         task = _nfs41_proc_sequence(clp, cred, false);
7387         if (IS_ERR(task))
7388                 ret = PTR_ERR(task);
7389         else
7390                 rpc_put_task_async(task);
7391         dprintk("<-- %s status=%d\n", __func__, ret);
7392         return ret;
7393 }
7394
7395 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7396 {
7397         struct rpc_task *task;
7398         int ret;
7399
7400         task = _nfs41_proc_sequence(clp, cred, true);
7401         if (IS_ERR(task)) {
7402                 ret = PTR_ERR(task);
7403                 goto out;
7404         }
7405         ret = rpc_wait_for_completion_task(task);
7406         if (!ret) {
7407                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7408
7409                 if (task->tk_status == 0)
7410                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7411                 ret = task->tk_status;
7412         }
7413         rpc_put_task(task);
7414 out:
7415         dprintk("<-- %s status=%d\n", __func__, ret);
7416         return ret;
7417 }
7418
7419 struct nfs4_reclaim_complete_data {
7420         struct nfs_client *clp;
7421         struct nfs41_reclaim_complete_args arg;
7422         struct nfs41_reclaim_complete_res res;
7423 };
7424
7425 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7426 {
7427         struct nfs4_reclaim_complete_data *calldata = data;
7428
7429         nfs41_setup_sequence(calldata->clp->cl_session,
7430                         &calldata->arg.seq_args,
7431                         &calldata->res.seq_res,
7432                         task);
7433 }
7434
7435 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7436 {
7437         switch(task->tk_status) {
7438         case 0:
7439         case -NFS4ERR_COMPLETE_ALREADY:
7440         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7441                 break;
7442         case -NFS4ERR_DELAY:
7443                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7444                 /* fall through */
7445         case -NFS4ERR_RETRY_UNCACHED_REP:
7446                 return -EAGAIN;
7447         default:
7448                 nfs4_schedule_lease_recovery(clp);
7449         }
7450         return 0;
7451 }
7452
7453 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7454 {
7455         struct nfs4_reclaim_complete_data *calldata = data;
7456         struct nfs_client *clp = calldata->clp;
7457         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7458
7459         dprintk("--> %s\n", __func__);
7460         if (!nfs41_sequence_done(task, res))
7461                 return;
7462
7463         trace_nfs4_reclaim_complete(clp, task->tk_status);
7464         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7465                 rpc_restart_call_prepare(task);
7466                 return;
7467         }
7468         dprintk("<-- %s\n", __func__);
7469 }
7470
7471 static void nfs4_free_reclaim_complete_data(void *data)
7472 {
7473         struct nfs4_reclaim_complete_data *calldata = data;
7474
7475         kfree(calldata);
7476 }
7477
7478 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7479         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7480         .rpc_call_done = nfs4_reclaim_complete_done,
7481         .rpc_release = nfs4_free_reclaim_complete_data,
7482 };
7483
7484 /*
7485  * Issue a global reclaim complete.
7486  */
7487 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7488                 struct rpc_cred *cred)
7489 {
7490         struct nfs4_reclaim_complete_data *calldata;
7491         struct rpc_task *task;
7492         struct rpc_message msg = {
7493                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7494                 .rpc_cred = cred,
7495         };
7496         struct rpc_task_setup task_setup_data = {
7497                 .rpc_client = clp->cl_rpcclient,
7498                 .rpc_message = &msg,
7499                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7500                 .flags = RPC_TASK_ASYNC,
7501         };
7502         int status = -ENOMEM;
7503
7504         dprintk("--> %s\n", __func__);
7505         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7506         if (calldata == NULL)
7507                 goto out;
7508         calldata->clp = clp;
7509         calldata->arg.one_fs = 0;
7510
7511         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7512         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7513         msg.rpc_argp = &calldata->arg;
7514         msg.rpc_resp = &calldata->res;
7515         task_setup_data.callback_data = calldata;
7516         task = rpc_run_task(&task_setup_data);
7517         if (IS_ERR(task)) {
7518                 status = PTR_ERR(task);
7519                 goto out;
7520         }
7521         status = nfs4_wait_for_completion_rpc_task(task);
7522         if (status == 0)
7523                 status = task->tk_status;
7524         rpc_put_task(task);
7525         return 0;
7526 out:
7527         dprintk("<-- %s status=%d\n", __func__, status);
7528         return status;
7529 }
7530
7531 static void
7532 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7533 {
7534         struct nfs4_layoutget *lgp = calldata;
7535         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7536         struct nfs4_session *session = nfs4_get_session(server);
7537
7538         dprintk("--> %s\n", __func__);
7539         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7540          * right now covering the LAYOUTGET we are about to send.
7541          * However, that is not so catastrophic, and there seems
7542          * to be no way to prevent it completely.
7543          */
7544         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7545                                 &lgp->res.seq_res, task))
7546                 return;
7547         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7548                                           NFS_I(lgp->args.inode)->layout,
7549                                           lgp->args.ctx->state)) {
7550                 rpc_exit(task, NFS4_OK);
7551         }
7552 }
7553
7554 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7555 {
7556         struct nfs4_layoutget *lgp = calldata;
7557         struct inode *inode = lgp->args.inode;
7558         struct nfs_server *server = NFS_SERVER(inode);
7559         struct pnfs_layout_hdr *lo;
7560         struct nfs4_state *state = NULL;
7561         unsigned long timeo, now, giveup;
7562
7563         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7564
7565         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7566                 goto out;
7567
7568         switch (task->tk_status) {
7569         case 0:
7570                 goto out;
7571         /*
7572          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7573          * (or clients) writing to the same RAID stripe
7574          */
7575         case -NFS4ERR_LAYOUTTRYLATER:
7576         /*
7577          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7578          * existing layout before getting a new one).
7579          */
7580         case -NFS4ERR_RECALLCONFLICT:
7581                 timeo = rpc_get_timeout(task->tk_client);
7582                 giveup = lgp->args.timestamp + timeo;
7583                 now = jiffies;
7584                 if (time_after(giveup, now)) {
7585                         unsigned long delay;
7586
7587                         /* Delay for:
7588                          * - Not less then NFS4_POLL_RETRY_MIN.
7589                          * - One last time a jiffie before we give up
7590                          * - exponential backoff (time_now minus start_attempt)
7591                          */
7592                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7593                                     min((giveup - now - 1),
7594                                         now - lgp->args.timestamp));
7595
7596                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7597                                 __func__, delay);
7598                         rpc_delay(task, delay);
7599                         task->tk_status = 0;
7600                         rpc_restart_call_prepare(task);
7601                         goto out; /* Do not call nfs4_async_handle_error() */
7602                 }
7603                 break;
7604         case -NFS4ERR_EXPIRED:
7605         case -NFS4ERR_BAD_STATEID:
7606                 spin_lock(&inode->i_lock);
7607                 lo = NFS_I(inode)->layout;
7608                 if (!lo || list_empty(&lo->plh_segs)) {
7609                         spin_unlock(&inode->i_lock);
7610                         /* If the open stateid was bad, then recover it. */
7611                         state = lgp->args.ctx->state;
7612                 } else {
7613                         LIST_HEAD(head);
7614
7615                         /*
7616                          * Mark the bad layout state as invalid, then retry
7617                          * with the current stateid.
7618                          */
7619                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7620                         spin_unlock(&inode->i_lock);
7621                         pnfs_free_lseg_list(&head);
7622
7623                         task->tk_status = 0;
7624                         rpc_restart_call_prepare(task);
7625                 }
7626         }
7627         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7628                 rpc_restart_call_prepare(task);
7629 out:
7630         dprintk("<-- %s\n", __func__);
7631 }
7632
7633 static size_t max_response_pages(struct nfs_server *server)
7634 {
7635         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7636         return nfs_page_array_len(0, max_resp_sz);
7637 }
7638
7639 static void nfs4_free_pages(struct page **pages, size_t size)
7640 {
7641         int i;
7642
7643         if (!pages)
7644                 return;
7645
7646         for (i = 0; i < size; i++) {
7647                 if (!pages[i])
7648                         break;
7649                 __free_page(pages[i]);
7650         }
7651         kfree(pages);
7652 }
7653
7654 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7655 {
7656         struct page **pages;
7657         int i;
7658
7659         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7660         if (!pages) {
7661                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7662                 return NULL;
7663         }
7664
7665         for (i = 0; i < size; i++) {
7666                 pages[i] = alloc_page(gfp_flags);
7667                 if (!pages[i]) {
7668                         dprintk("%s: failed to allocate page\n", __func__);
7669                         nfs4_free_pages(pages, size);
7670                         return NULL;
7671                 }
7672         }
7673
7674         return pages;
7675 }
7676
7677 static void nfs4_layoutget_release(void *calldata)
7678 {
7679         struct nfs4_layoutget *lgp = calldata;
7680         struct inode *inode = lgp->args.inode;
7681         struct nfs_server *server = NFS_SERVER(inode);
7682         size_t max_pages = max_response_pages(server);
7683
7684         dprintk("--> %s\n", __func__);
7685         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7686         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7687         put_nfs_open_context(lgp->args.ctx);
7688         kfree(calldata);
7689         dprintk("<-- %s\n", __func__);
7690 }
7691
7692 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7693         .rpc_call_prepare = nfs4_layoutget_prepare,
7694         .rpc_call_done = nfs4_layoutget_done,
7695         .rpc_release = nfs4_layoutget_release,
7696 };
7697
7698 struct pnfs_layout_segment *
7699 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7700 {
7701         struct inode *inode = lgp->args.inode;
7702         struct nfs_server *server = NFS_SERVER(inode);
7703         size_t max_pages = max_response_pages(server);
7704         struct rpc_task *task;
7705         struct rpc_message msg = {
7706                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7707                 .rpc_argp = &lgp->args,
7708                 .rpc_resp = &lgp->res,
7709                 .rpc_cred = lgp->cred,
7710         };
7711         struct rpc_task_setup task_setup_data = {
7712                 .rpc_client = server->client,
7713                 .rpc_message = &msg,
7714                 .callback_ops = &nfs4_layoutget_call_ops,
7715                 .callback_data = lgp,
7716                 .flags = RPC_TASK_ASYNC,
7717         };
7718         struct pnfs_layout_segment *lseg = NULL;
7719         int status = 0;
7720
7721         dprintk("--> %s\n", __func__);
7722
7723         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7724         if (!lgp->args.layout.pages) {
7725                 nfs4_layoutget_release(lgp);
7726                 return ERR_PTR(-ENOMEM);
7727         }
7728         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7729         lgp->args.timestamp = jiffies;
7730
7731         lgp->res.layoutp = &lgp->args.layout;
7732         lgp->res.seq_res.sr_slot = NULL;
7733         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7734
7735         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7736         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7737
7738         task = rpc_run_task(&task_setup_data);
7739         if (IS_ERR(task))
7740                 return ERR_CAST(task);
7741         status = nfs4_wait_for_completion_rpc_task(task);
7742         if (status == 0)
7743                 status = task->tk_status;
7744         trace_nfs4_layoutget(lgp->args.ctx,
7745                         &lgp->args.range,
7746                         &lgp->res.range,
7747                         status);
7748         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7749         if (status == 0 && lgp->res.layoutp->len)
7750                 lseg = pnfs_layout_process(lgp);
7751         rpc_put_task(task);
7752         dprintk("<-- %s status=%d\n", __func__, status);
7753         if (status)
7754                 return ERR_PTR(status);
7755         return lseg;
7756 }
7757
7758 static void
7759 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7760 {
7761         struct nfs4_layoutreturn *lrp = calldata;
7762
7763         dprintk("--> %s\n", __func__);
7764         nfs41_setup_sequence(lrp->clp->cl_session,
7765                         &lrp->args.seq_args,
7766                         &lrp->res.seq_res,
7767                         task);
7768 }
7769
7770 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7771 {
7772         struct nfs4_layoutreturn *lrp = calldata;
7773         struct nfs_server *server;
7774
7775         dprintk("--> %s\n", __func__);
7776
7777         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7778                 return;
7779
7780         server = NFS_SERVER(lrp->args.inode);
7781         switch (task->tk_status) {
7782         default:
7783                 task->tk_status = 0;
7784         case 0:
7785                 break;
7786         case -NFS4ERR_DELAY:
7787                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7788                         break;
7789                 rpc_restart_call_prepare(task);
7790                 return;
7791         }
7792         dprintk("<-- %s\n", __func__);
7793 }
7794
7795 static void nfs4_layoutreturn_release(void *calldata)
7796 {
7797         struct nfs4_layoutreturn *lrp = calldata;
7798         struct pnfs_layout_hdr *lo = lrp->args.layout;
7799
7800         dprintk("--> %s\n", __func__);
7801         spin_lock(&lo->plh_inode->i_lock);
7802         if (lrp->res.lrs_present)
7803                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7804         lo->plh_block_lgets--;
7805         spin_unlock(&lo->plh_inode->i_lock);
7806         pnfs_put_layout_hdr(lrp->args.layout);
7807         kfree(calldata);
7808         dprintk("<-- %s\n", __func__);
7809 }
7810
7811 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7812         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7813         .rpc_call_done = nfs4_layoutreturn_done,
7814         .rpc_release = nfs4_layoutreturn_release,
7815 };
7816
7817 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7818 {
7819         struct rpc_task *task;
7820         struct rpc_message msg = {
7821                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7822                 .rpc_argp = &lrp->args,
7823                 .rpc_resp = &lrp->res,
7824                 .rpc_cred = lrp->cred,
7825         };
7826         struct rpc_task_setup task_setup_data = {
7827                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7828                 .rpc_message = &msg,
7829                 .callback_ops = &nfs4_layoutreturn_call_ops,
7830                 .callback_data = lrp,
7831         };
7832         int status;
7833
7834         dprintk("--> %s\n", __func__);
7835         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7836         task = rpc_run_task(&task_setup_data);
7837         if (IS_ERR(task))
7838                 return PTR_ERR(task);
7839         status = task->tk_status;
7840         trace_nfs4_layoutreturn(lrp->args.inode, status);
7841         dprintk("<-- %s status=%d\n", __func__, status);
7842         rpc_put_task(task);
7843         return status;
7844 }
7845
7846 static int
7847 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7848                 struct pnfs_device *pdev,
7849                 struct rpc_cred *cred)
7850 {
7851         struct nfs4_getdeviceinfo_args args = {
7852                 .pdev = pdev,
7853         };
7854         struct nfs4_getdeviceinfo_res res = {
7855                 .pdev = pdev,
7856         };
7857         struct rpc_message msg = {
7858                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7859                 .rpc_argp = &args,
7860                 .rpc_resp = &res,
7861                 .rpc_cred = cred,
7862         };
7863         int status;
7864
7865         dprintk("--> %s\n", __func__);
7866         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7867         dprintk("<-- %s status=%d\n", __func__, status);
7868
7869         return status;
7870 }
7871
7872 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7873                 struct pnfs_device *pdev,
7874                 struct rpc_cred *cred)
7875 {
7876         struct nfs4_exception exception = { };
7877         int err;
7878
7879         do {
7880                 err = nfs4_handle_exception(server,
7881                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7882                                         &exception);
7883         } while (exception.retry);
7884         return err;
7885 }
7886 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7887
7888 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7889 {
7890         struct nfs4_layoutcommit_data *data = calldata;
7891         struct nfs_server *server = NFS_SERVER(data->args.inode);
7892         struct nfs4_session *session = nfs4_get_session(server);
7893
7894         nfs41_setup_sequence(session,
7895                         &data->args.seq_args,
7896                         &data->res.seq_res,
7897                         task);
7898 }
7899
7900 static void
7901 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7902 {
7903         struct nfs4_layoutcommit_data *data = calldata;
7904         struct nfs_server *server = NFS_SERVER(data->args.inode);
7905
7906         if (!nfs41_sequence_done(task, &data->res.seq_res))
7907                 return;
7908
7909         switch (task->tk_status) { /* Just ignore these failures */
7910         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7911         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7912         case -NFS4ERR_BADLAYOUT:     /* no layout */
7913         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7914                 task->tk_status = 0;
7915         case 0:
7916                 break;
7917         default:
7918                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7919                         rpc_restart_call_prepare(task);
7920                         return;
7921                 }
7922         }
7923 }
7924
7925 static void nfs4_layoutcommit_release(void *calldata)
7926 {
7927         struct nfs4_layoutcommit_data *data = calldata;
7928
7929         pnfs_cleanup_layoutcommit(data);
7930         nfs_post_op_update_inode_force_wcc(data->args.inode,
7931                                            data->res.fattr);
7932         put_rpccred(data->cred);
7933         kfree(data);
7934 }
7935
7936 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7937         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7938         .rpc_call_done = nfs4_layoutcommit_done,
7939         .rpc_release = nfs4_layoutcommit_release,
7940 };
7941
7942 int
7943 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7944 {
7945         struct rpc_message msg = {
7946                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7947                 .rpc_argp = &data->args,
7948                 .rpc_resp = &data->res,
7949                 .rpc_cred = data->cred,
7950         };
7951         struct rpc_task_setup task_setup_data = {
7952                 .task = &data->task,
7953                 .rpc_client = NFS_CLIENT(data->args.inode),
7954                 .rpc_message = &msg,
7955                 .callback_ops = &nfs4_layoutcommit_ops,
7956                 .callback_data = data,
7957                 .flags = RPC_TASK_ASYNC,
7958         };
7959         struct rpc_task *task;
7960         int status = 0;
7961
7962         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7963                 "lbw: %llu inode %lu\n",
7964                 data->task.tk_pid, sync,
7965                 data->args.lastbytewritten,
7966                 data->args.inode->i_ino);
7967
7968         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7969         task = rpc_run_task(&task_setup_data);
7970         if (IS_ERR(task))
7971                 return PTR_ERR(task);
7972         if (sync == false)
7973                 goto out;
7974         status = nfs4_wait_for_completion_rpc_task(task);
7975         if (status != 0)
7976                 goto out;
7977         status = task->tk_status;
7978         trace_nfs4_layoutcommit(data->args.inode, status);
7979 out:
7980         dprintk("%s: status %d\n", __func__, status);
7981         rpc_put_task(task);
7982         return status;
7983 }
7984
7985 /**
7986  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7987  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7988  */
7989 static int
7990 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7991                     struct nfs_fsinfo *info,
7992                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7993 {
7994         struct nfs41_secinfo_no_name_args args = {
7995                 .style = SECINFO_STYLE_CURRENT_FH,
7996         };
7997         struct nfs4_secinfo_res res = {
7998                 .flavors = flavors,
7999         };
8000         struct rpc_message msg = {
8001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8002                 .rpc_argp = &args,
8003                 .rpc_resp = &res,
8004         };
8005         struct rpc_clnt *clnt = server->client;
8006         struct rpc_cred *cred = NULL;
8007         int status;
8008
8009         if (use_integrity) {
8010                 clnt = server->nfs_client->cl_rpcclient;
8011                 cred = nfs4_get_clid_cred(server->nfs_client);
8012                 msg.rpc_cred = cred;
8013         }
8014
8015         dprintk("--> %s\n", __func__);
8016         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8017                                 &res.seq_res, 0);
8018         dprintk("<-- %s status=%d\n", __func__, status);
8019
8020         if (cred)
8021                 put_rpccred(cred);
8022
8023         return status;
8024 }
8025
8026 static int
8027 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8028                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8029 {
8030         struct nfs4_exception exception = { };
8031         int err;
8032         do {
8033                 /* first try using integrity protection */
8034                 err = -NFS4ERR_WRONGSEC;
8035
8036                 /* try to use integrity protection with machine cred */
8037                 if (_nfs4_is_integrity_protected(server->nfs_client))
8038                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8039                                                           flavors, true);
8040
8041                 /*
8042                  * if unable to use integrity protection, or SECINFO with
8043                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8044                  * disallowed by spec, but exists in deployed servers) use
8045                  * the current filesystem's rpc_client and the user cred.
8046                  */
8047                 if (err == -NFS4ERR_WRONGSEC)
8048                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8049                                                           flavors, false);
8050
8051                 switch (err) {
8052                 case 0:
8053                 case -NFS4ERR_WRONGSEC:
8054                 case -ENOTSUPP:
8055                         goto out;
8056                 default:
8057                         err = nfs4_handle_exception(server, err, &exception);
8058                 }
8059         } while (exception.retry);
8060 out:
8061         return err;
8062 }
8063
8064 static int
8065 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8066                     struct nfs_fsinfo *info)
8067 {
8068         int err;
8069         struct page *page;
8070         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8071         struct nfs4_secinfo_flavors *flavors;
8072         struct nfs4_secinfo4 *secinfo;
8073         int i;
8074
8075         page = alloc_page(GFP_KERNEL);
8076         if (!page) {
8077                 err = -ENOMEM;
8078                 goto out;
8079         }
8080
8081         flavors = page_address(page);
8082         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8083
8084         /*
8085          * Fall back on "guess and check" method if
8086          * the server doesn't support SECINFO_NO_NAME
8087          */
8088         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8089                 err = nfs4_find_root_sec(server, fhandle, info);
8090                 goto out_freepage;
8091         }
8092         if (err)
8093                 goto out_freepage;
8094
8095         for (i = 0; i < flavors->num_flavors; i++) {
8096                 secinfo = &flavors->flavors[i];
8097
8098                 switch (secinfo->flavor) {
8099                 case RPC_AUTH_NULL:
8100                 case RPC_AUTH_UNIX:
8101                 case RPC_AUTH_GSS:
8102                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8103                                         &secinfo->flavor_info);
8104                         break;
8105                 default:
8106                         flavor = RPC_AUTH_MAXFLAVOR;
8107                         break;
8108                 }
8109
8110                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8111                         flavor = RPC_AUTH_MAXFLAVOR;
8112
8113                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8114                         err = nfs4_lookup_root_sec(server, fhandle,
8115                                                    info, flavor);
8116                         if (!err)
8117                                 break;
8118                 }
8119         }
8120
8121         if (flavor == RPC_AUTH_MAXFLAVOR)
8122                 err = -EPERM;
8123
8124 out_freepage:
8125         put_page(page);
8126         if (err == -EACCES)
8127                 return -EPERM;
8128 out:
8129         return err;
8130 }
8131
8132 static int _nfs41_test_stateid(struct nfs_server *server,
8133                 nfs4_stateid *stateid,
8134                 struct rpc_cred *cred)
8135 {
8136         int status;
8137         struct nfs41_test_stateid_args args = {
8138                 .stateid = stateid,
8139         };
8140         struct nfs41_test_stateid_res res;
8141         struct rpc_message msg = {
8142                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8143                 .rpc_argp = &args,
8144                 .rpc_resp = &res,
8145                 .rpc_cred = cred,
8146         };
8147         struct rpc_clnt *rpc_client = server->client;
8148
8149         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8150                 &rpc_client, &msg);
8151
8152         dprintk("NFS call  test_stateid %p\n", stateid);
8153         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8154         nfs4_set_sequence_privileged(&args.seq_args);
8155         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8156                         &args.seq_args, &res.seq_res);
8157         if (status != NFS_OK) {
8158                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8159                 return status;
8160         }
8161         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8162         return -res.status;
8163 }
8164
8165 /**
8166  * nfs41_test_stateid - perform a TEST_STATEID operation
8167  *
8168  * @server: server / transport on which to perform the operation
8169  * @stateid: state ID to test
8170  * @cred: credential
8171  *
8172  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8173  * Otherwise a negative NFS4ERR value is returned if the operation
8174  * failed or the state ID is not currently valid.
8175  */
8176 static int nfs41_test_stateid(struct nfs_server *server,
8177                 nfs4_stateid *stateid,
8178                 struct rpc_cred *cred)
8179 {
8180         struct nfs4_exception exception = { };
8181         int err;
8182         do {
8183                 err = _nfs41_test_stateid(server, stateid, cred);
8184                 if (err != -NFS4ERR_DELAY)
8185                         break;
8186                 nfs4_handle_exception(server, err, &exception);
8187         } while (exception.retry);
8188         return err;
8189 }
8190
8191 struct nfs_free_stateid_data {
8192         struct nfs_server *server;
8193         struct nfs41_free_stateid_args args;
8194         struct nfs41_free_stateid_res res;
8195 };
8196
8197 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8198 {
8199         struct nfs_free_stateid_data *data = calldata;
8200         nfs41_setup_sequence(nfs4_get_session(data->server),
8201                         &data->args.seq_args,
8202                         &data->res.seq_res,
8203                         task);
8204 }
8205
8206 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8207 {
8208         struct nfs_free_stateid_data *data = calldata;
8209
8210         nfs41_sequence_done(task, &data->res.seq_res);
8211
8212         switch (task->tk_status) {
8213         case -NFS4ERR_DELAY:
8214                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8215                         rpc_restart_call_prepare(task);
8216         }
8217 }
8218
8219 static void nfs41_free_stateid_release(void *calldata)
8220 {
8221         kfree(calldata);
8222 }
8223
8224 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8225         .rpc_call_prepare = nfs41_free_stateid_prepare,
8226         .rpc_call_done = nfs41_free_stateid_done,
8227         .rpc_release = nfs41_free_stateid_release,
8228 };
8229
8230 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8231                 nfs4_stateid *stateid,
8232                 struct rpc_cred *cred,
8233                 bool privileged)
8234 {
8235         struct rpc_message msg = {
8236                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8237                 .rpc_cred = cred,
8238         };
8239         struct rpc_task_setup task_setup = {
8240                 .rpc_client = server->client,
8241                 .rpc_message = &msg,
8242                 .callback_ops = &nfs41_free_stateid_ops,
8243                 .flags = RPC_TASK_ASYNC,
8244         };
8245         struct nfs_free_stateid_data *data;
8246
8247         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8248                 &task_setup.rpc_client, &msg);
8249
8250         dprintk("NFS call  free_stateid %p\n", stateid);
8251         data = kmalloc(sizeof(*data), GFP_NOFS);
8252         if (!data)
8253                 return ERR_PTR(-ENOMEM);
8254         data->server = server;
8255         nfs4_stateid_copy(&data->args.stateid, stateid);
8256
8257         task_setup.callback_data = data;
8258
8259         msg.rpc_argp = &data->args;
8260         msg.rpc_resp = &data->res;
8261         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8262         if (privileged)
8263                 nfs4_set_sequence_privileged(&data->args.seq_args);
8264
8265         return rpc_run_task(&task_setup);
8266 }
8267
8268 /**
8269  * nfs41_free_stateid - perform a FREE_STATEID operation
8270  *
8271  * @server: server / transport on which to perform the operation
8272  * @stateid: state ID to release
8273  * @cred: credential
8274  *
8275  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8276  * negative NFS4ERR value is returned.
8277  */
8278 static int nfs41_free_stateid(struct nfs_server *server,
8279                 nfs4_stateid *stateid,
8280                 struct rpc_cred *cred)
8281 {
8282         struct rpc_task *task;
8283         int ret;
8284
8285         task = _nfs41_free_stateid(server, stateid, cred, true);
8286         if (IS_ERR(task))
8287                 return PTR_ERR(task);
8288         ret = rpc_wait_for_completion_task(task);
8289         if (!ret)
8290                 ret = task->tk_status;
8291         rpc_put_task(task);
8292         return ret;
8293 }
8294
8295 static void
8296 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8297 {
8298         struct rpc_task *task;
8299         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8300
8301         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8302         nfs4_free_lock_state(server, lsp);
8303         if (IS_ERR(task))
8304                 return;
8305         rpc_put_task(task);
8306 }
8307
8308 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8309                 const nfs4_stateid *s2)
8310 {
8311         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8312                 return false;
8313
8314         if (s1->seqid == s2->seqid)
8315                 return true;
8316         if (s1->seqid == 0 || s2->seqid == 0)
8317                 return true;
8318
8319         return false;
8320 }
8321
8322 #endif /* CONFIG_NFS_V4_1 */
8323
8324 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8325                 const nfs4_stateid *s2)
8326 {
8327         return nfs4_stateid_match(s1, s2);
8328 }
8329
8330
8331 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8332         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8333         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8334         .recover_open   = nfs4_open_reclaim,
8335         .recover_lock   = nfs4_lock_reclaim,
8336         .establish_clid = nfs4_init_clientid,
8337         .detect_trunking = nfs40_discover_server_trunking,
8338 };
8339
8340 #if defined(CONFIG_NFS_V4_1)
8341 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8342         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8343         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8344         .recover_open   = nfs4_open_reclaim,
8345         .recover_lock   = nfs4_lock_reclaim,
8346         .establish_clid = nfs41_init_clientid,
8347         .reclaim_complete = nfs41_proc_reclaim_complete,
8348         .detect_trunking = nfs41_discover_server_trunking,
8349 };
8350 #endif /* CONFIG_NFS_V4_1 */
8351
8352 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8353         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8354         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8355         .recover_open   = nfs40_open_expired,
8356         .recover_lock   = nfs4_lock_expired,
8357         .establish_clid = nfs4_init_clientid,
8358 };
8359
8360 #if defined(CONFIG_NFS_V4_1)
8361 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8362         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8363         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8364         .recover_open   = nfs41_open_expired,
8365         .recover_lock   = nfs41_lock_expired,
8366         .establish_clid = nfs41_init_clientid,
8367 };
8368 #endif /* CONFIG_NFS_V4_1 */
8369
8370 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8371         .sched_state_renewal = nfs4_proc_async_renew,
8372         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8373         .renew_lease = nfs4_proc_renew,
8374 };
8375
8376 #if defined(CONFIG_NFS_V4_1)
8377 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8378         .sched_state_renewal = nfs41_proc_async_sequence,
8379         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8380         .renew_lease = nfs4_proc_sequence,
8381 };
8382 #endif
8383
8384 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8385         .get_locations = _nfs40_proc_get_locations,
8386         .fsid_present = _nfs40_proc_fsid_present,
8387 };
8388
8389 #if defined(CONFIG_NFS_V4_1)
8390 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8391         .get_locations = _nfs41_proc_get_locations,
8392         .fsid_present = _nfs41_proc_fsid_present,
8393 };
8394 #endif  /* CONFIG_NFS_V4_1 */
8395
8396 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8397         .minor_version = 0,
8398         .init_caps = NFS_CAP_READDIRPLUS
8399                 | NFS_CAP_ATOMIC_OPEN
8400                 | NFS_CAP_CHANGE_ATTR
8401                 | NFS_CAP_POSIX_LOCK,
8402         .init_client = nfs40_init_client,
8403         .shutdown_client = nfs40_shutdown_client,
8404         .match_stateid = nfs4_match_stateid,
8405         .find_root_sec = nfs4_find_root_sec,
8406         .free_lock_state = nfs4_release_lockowner,
8407         .call_sync_ops = &nfs40_call_sync_ops,
8408         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8409         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8410         .state_renewal_ops = &nfs40_state_renewal_ops,
8411         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8412 };
8413
8414 #if defined(CONFIG_NFS_V4_1)
8415 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8416         .minor_version = 1,
8417         .init_caps = NFS_CAP_READDIRPLUS
8418                 | NFS_CAP_ATOMIC_OPEN
8419                 | NFS_CAP_CHANGE_ATTR
8420                 | NFS_CAP_POSIX_LOCK
8421                 | NFS_CAP_STATEID_NFSV41
8422                 | NFS_CAP_ATOMIC_OPEN_V1,
8423         .init_client = nfs41_init_client,
8424         .shutdown_client = nfs41_shutdown_client,
8425         .match_stateid = nfs41_match_stateid,
8426         .find_root_sec = nfs41_find_root_sec,
8427         .free_lock_state = nfs41_free_lock_state,
8428         .call_sync_ops = &nfs41_call_sync_ops,
8429         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8430         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8431         .state_renewal_ops = &nfs41_state_renewal_ops,
8432         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8433 };
8434 #endif
8435
8436 #if defined(CONFIG_NFS_V4_2)
8437 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8438         .minor_version = 2,
8439         .init_caps = NFS_CAP_READDIRPLUS
8440                 | NFS_CAP_ATOMIC_OPEN
8441                 | NFS_CAP_CHANGE_ATTR
8442                 | NFS_CAP_POSIX_LOCK
8443                 | NFS_CAP_STATEID_NFSV41
8444                 | NFS_CAP_ATOMIC_OPEN_V1
8445                 | NFS_CAP_SEEK,
8446         .init_client = nfs41_init_client,
8447         .shutdown_client = nfs41_shutdown_client,
8448         .match_stateid = nfs41_match_stateid,
8449         .find_root_sec = nfs41_find_root_sec,
8450         .free_lock_state = nfs41_free_lock_state,
8451         .call_sync_ops = &nfs41_call_sync_ops,
8452         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8453         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8454         .state_renewal_ops = &nfs41_state_renewal_ops,
8455 };
8456 #endif
8457
8458 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8459         [0] = &nfs_v4_0_minor_ops,
8460 #if defined(CONFIG_NFS_V4_1)
8461         [1] = &nfs_v4_1_minor_ops,
8462 #endif
8463 #if defined(CONFIG_NFS_V4_2)
8464         [2] = &nfs_v4_2_minor_ops,
8465 #endif
8466 };
8467
8468 static const struct inode_operations nfs4_dir_inode_operations = {
8469         .create         = nfs_create,
8470         .lookup         = nfs_lookup,
8471         .atomic_open    = nfs_atomic_open,
8472         .link           = nfs_link,
8473         .unlink         = nfs_unlink,
8474         .symlink        = nfs_symlink,
8475         .mkdir          = nfs_mkdir,
8476         .rmdir          = nfs_rmdir,
8477         .mknod          = nfs_mknod,
8478         .rename         = nfs_rename,
8479         .permission     = nfs_permission,
8480         .getattr        = nfs_getattr,
8481         .setattr        = nfs_setattr,
8482         .getxattr       = generic_getxattr,
8483         .setxattr       = generic_setxattr,
8484         .listxattr      = generic_listxattr,
8485         .removexattr    = generic_removexattr,
8486 };
8487
8488 static const struct inode_operations nfs4_file_inode_operations = {
8489         .permission     = nfs_permission,
8490         .getattr        = nfs_getattr,
8491         .setattr        = nfs_setattr,
8492         .getxattr       = generic_getxattr,
8493         .setxattr       = generic_setxattr,
8494         .listxattr      = generic_listxattr,
8495         .removexattr    = generic_removexattr,
8496 };
8497
8498 const struct nfs_rpc_ops nfs_v4_clientops = {
8499         .version        = 4,                    /* protocol version */
8500         .dentry_ops     = &nfs4_dentry_operations,
8501         .dir_inode_ops  = &nfs4_dir_inode_operations,
8502         .file_inode_ops = &nfs4_file_inode_operations,
8503         .file_ops       = &nfs4_file_operations,
8504         .getroot        = nfs4_proc_get_root,
8505         .submount       = nfs4_submount,
8506         .try_mount      = nfs4_try_mount,
8507         .getattr        = nfs4_proc_getattr,
8508         .setattr        = nfs4_proc_setattr,
8509         .lookup         = nfs4_proc_lookup,
8510         .access         = nfs4_proc_access,
8511         .readlink       = nfs4_proc_readlink,
8512         .create         = nfs4_proc_create,
8513         .remove         = nfs4_proc_remove,
8514         .unlink_setup   = nfs4_proc_unlink_setup,
8515         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8516         .unlink_done    = nfs4_proc_unlink_done,
8517         .rename_setup   = nfs4_proc_rename_setup,
8518         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8519         .rename_done    = nfs4_proc_rename_done,
8520         .link           = nfs4_proc_link,
8521         .symlink        = nfs4_proc_symlink,
8522         .mkdir          = nfs4_proc_mkdir,
8523         .rmdir          = nfs4_proc_remove,
8524         .readdir        = nfs4_proc_readdir,
8525         .mknod          = nfs4_proc_mknod,
8526         .statfs         = nfs4_proc_statfs,
8527         .fsinfo         = nfs4_proc_fsinfo,
8528         .pathconf       = nfs4_proc_pathconf,
8529         .set_capabilities = nfs4_server_capabilities,
8530         .decode_dirent  = nfs4_decode_dirent,
8531         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8532         .read_setup     = nfs4_proc_read_setup,
8533         .read_done      = nfs4_read_done,
8534         .write_setup    = nfs4_proc_write_setup,
8535         .write_done     = nfs4_write_done,
8536         .commit_setup   = nfs4_proc_commit_setup,
8537         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8538         .commit_done    = nfs4_commit_done,
8539         .lock           = nfs4_proc_lock,
8540         .clear_acl_cache = nfs4_zap_acl_attr,
8541         .close_context  = nfs4_close_context,
8542         .open_context   = nfs4_atomic_open,
8543         .have_delegation = nfs4_have_delegation,
8544         .return_delegation = nfs4_inode_return_delegation,
8545         .alloc_client   = nfs4_alloc_client,
8546         .init_client    = nfs4_init_client,
8547         .free_client    = nfs4_free_client,
8548         .create_server  = nfs4_create_server,
8549         .clone_server   = nfs_clone_server,
8550 };
8551
8552 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8553         .prefix = XATTR_NAME_NFSV4_ACL,
8554         .list   = nfs4_xattr_list_nfs4_acl,
8555         .get    = nfs4_xattr_get_nfs4_acl,
8556         .set    = nfs4_xattr_set_nfs4_acl,
8557 };
8558
8559 const struct xattr_handler *nfs4_xattr_handlers[] = {
8560         &nfs4_xattr_nfs4_acl_handler,
8561 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8562         &nfs4_xattr_nfs4_label_handler,
8563 #endif
8564         NULL
8565 };
8566
8567 /*
8568  * Local variables:
8569  *  c-basic-offset: 8
8570  * End:
8571  */