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 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state);
  85 #ifdef CONFIG_NFS_V4_1
  86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  88 #endif
  89 /* Prevent leaks of NFSv4 errors into userland */
  90 static int nfs4_map_errors(int err)
  91 {
  92         if (err >= -1000)
  93                 return err;
  94         switch (err) {
  95         case -NFS4ERR_RESOURCE:
  96         case -NFS4ERR_LAYOUTTRYLATER:
  97         case -NFS4ERR_RECALLCONFLICT:
  98                 return -EREMOTEIO;
  99         case -NFS4ERR_WRONGSEC:
 100                 return -EPERM;
 101         case -NFS4ERR_BADOWNER:
 102         case -NFS4ERR_BADNAME:
 103                 return -EINVAL;
 104         case -NFS4ERR_SHARE_DENIED:
 105                 return -EACCES;
 106         case -NFS4ERR_MINOR_VERS_MISMATCH:
 107                 return -EPROTONOSUPPORT;
 108         case -NFS4ERR_ACCESS:
 109                 return -EACCES;
 110         case -NFS4ERR_FILE_OPEN:
 111                 return -EBUSY;
 112         default:
 113                 dprintk("%s could not handle NFSv4 error %d\n",
 114                                 __func__, -err);
 115                 break;
 116         }
 117         return -EIO;
 118 }
 119
 120 /*
 121  * This is our standard bitmap for GETATTR requests.
 122  */
 123 const u32 nfs4_fattr_bitmap[3] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138 };
 139
 140 static const u32 nfs4_pnfs_open_bitmap[3] = {
 141         FATTR4_WORD0_TYPE
 142         | FATTR4_WORD0_CHANGE
 143         | FATTR4_WORD0_SIZE
 144         | FATTR4_WORD0_FSID
 145         | FATTR4_WORD0_FILEID,
 146         FATTR4_WORD1_MODE
 147         | FATTR4_WORD1_NUMLINKS
 148         | FATTR4_WORD1_OWNER
 149         | FATTR4_WORD1_OWNER_GROUP
 150         | FATTR4_WORD1_RAWDEV
 151         | FATTR4_WORD1_SPACE_USED
 152         | FATTR4_WORD1_TIME_ACCESS
 153         | FATTR4_WORD1_TIME_METADATA
 154         | FATTR4_WORD1_TIME_MODIFY,
 155         FATTR4_WORD2_MDSTHRESHOLD
 156 };
 157
 158 static const u32 nfs4_open_noattr_bitmap[3] = {
 159         FATTR4_WORD0_TYPE
 160         | FATTR4_WORD0_CHANGE
 161         | FATTR4_WORD0_FILEID,
 162 };
 163
 164 const u32 nfs4_statfs_bitmap[2] = {
 165         FATTR4_WORD0_FILES_AVAIL
 166         | FATTR4_WORD0_FILES_FREE
 167         | FATTR4_WORD0_FILES_TOTAL,
 168         FATTR4_WORD1_SPACE_AVAIL
 169         | FATTR4_WORD1_SPACE_FREE
 170         | FATTR4_WORD1_SPACE_TOTAL
 171 };
 172
 173 const u32 nfs4_pathconf_bitmap[2] = {
 174         FATTR4_WORD0_MAXLINK
 175         | FATTR4_WORD0_MAXNAME,
 176         0
 177 };
 178
 179 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 180                         | FATTR4_WORD0_MAXREAD
 181                         | FATTR4_WORD0_MAXWRITE
 182                         | FATTR4_WORD0_LEASE_TIME,
 183                         FATTR4_WORD1_TIME_DELTA
 184                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 185                         FATTR4_WORD2_LAYOUT_BLKSIZE
 186 };
 187
 188 const u32 nfs4_fs_locations_bitmap[2] = {
 189         FATTR4_WORD0_TYPE
 190         | FATTR4_WORD0_CHANGE
 191         | FATTR4_WORD0_SIZE
 192         | FATTR4_WORD0_FSID
 193         | FATTR4_WORD0_FILEID
 194         | FATTR4_WORD0_FS_LOCATIONS,
 195         FATTR4_WORD1_MODE
 196         | FATTR4_WORD1_NUMLINKS
 197         | FATTR4_WORD1_OWNER
 198         | FATTR4_WORD1_OWNER_GROUP
 199         | FATTR4_WORD1_RAWDEV
 200         | FATTR4_WORD1_SPACE_USED
 201         | FATTR4_WORD1_TIME_ACCESS
 202         | FATTR4_WORD1_TIME_METADATA
 203         | FATTR4_WORD1_TIME_MODIFY
 204         | FATTR4_WORD1_MOUNTED_ON_FILEID
 205 };
 206
 207 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 208                 struct nfs4_readdir_arg *readdir)
 209 {
 210         __be32 *start, *p;
 211
 212         if (cookie > 2) {
 213                 readdir->cookie = cookie;
 214                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 215                 return;
 216         }
 217
 218         readdir->cookie = 0;
 219         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 220         if (cookie == 2)
 221                 return;
 222
 223         /*
 224          * NFSv4 servers do not return entries for '.' and '..'
 225          * Therefore, we fake these entries here.  We let '.'
 226          * have cookie 0 and '..' have cookie 1.  Note that
 227          * when talking to the server, we always send cookie 0
 228          * instead of 1 or 2.
 229          */
 230         start = p = kmap_atomic(*readdir->pages);
 231
 232         if (cookie == 0) {
 233                 *p++ = xdr_one;                                  /* next */
 234                 *p++ = xdr_zero;                   /* cookie, first word */
 235                 *p++ = xdr_one;                   /* cookie, second word */
 236                 *p++ = xdr_one;                             /* entry len */
 237                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 238                 p++;
 239                 *p++ = xdr_one;                         /* bitmap length */
 240                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 241                 *p++ = htonl(8);              /* attribute buffer length */
 242                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 243         }
 244
 245         *p++ = xdr_one;                                  /* next */
 246         *p++ = xdr_zero;                   /* cookie, first word */
 247         *p++ = xdr_two;                   /* cookie, second word */
 248         *p++ = xdr_two;                             /* entry len */
 249         memcpy(p, "..\0\0", 4);                         /* entry */
 250         p++;
 251         *p++ = xdr_one;                         /* bitmap length */
 252         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 253         *p++ = htonl(8);              /* attribute buffer length */
 254         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 255
 256         readdir->pgbase = (char *)p - (char *)start;
 257         readdir->count -= readdir->pgbase;
 258         kunmap_atomic(start);
 259 }
 260
 261 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 262 {
 263         int res = 0;
 264
 265         might_sleep();
 266
 267         if (*timeout <= 0)
 268                 *timeout = NFS4_POLL_RETRY_MIN;
 269         if (*timeout > NFS4_POLL_RETRY_MAX)
 270                 *timeout = NFS4_POLL_RETRY_MAX;
 271         freezable_schedule_timeout_killable(*timeout);
 272         if (fatal_signal_pending(current))
 273                 res = -ERESTARTSYS;
 274         *timeout <<= 1;
 275         return res;
 276 }
 277
 278 /* This is the error handling routine for processes that are allowed
 279  * to sleep.
 280  */
 281 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 282 {
 283         struct nfs_client *clp = server->nfs_client;
 284         struct nfs4_state *state = exception->state;
 285         struct inode *inode = exception->inode;
 286         int ret = errorcode;
 287
 288         exception->retry = 0;
 289         switch(errorcode) {
 290                 case 0:
 291                         return 0;
 292                 case -NFS4ERR_OPENMODE:
 293                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 294                                 nfs4_inode_return_delegation(inode);
 295                                 exception->retry = 1;
 296                                 return 0;
 297                         }
 298                         if (state == NULL)
 299                                 break;
 300                         ret = nfs4_schedule_stateid_recovery(server, state);
 301                         if (ret < 0)
 302                                 break;
 303                         goto wait_on_recovery;
 304                 case -NFS4ERR_DELEG_REVOKED:
 305                 case -NFS4ERR_ADMIN_REVOKED:
 306                 case -NFS4ERR_BAD_STATEID:
 307                         if (state == NULL)
 308                                 break;
 309                         nfs_remove_bad_delegation(state->inode);
 310                         ret = nfs4_schedule_stateid_recovery(server, state);
 311                         if (ret < 0)
 312                                 break;
 313                         goto wait_on_recovery;
 314                 case -NFS4ERR_EXPIRED:
 315                         if (state != NULL) {
 316                                 ret = nfs4_schedule_stateid_recovery(server, state);
 317                                 if (ret < 0)
 318                                         break;
 319                         }
 320                 case -NFS4ERR_STALE_STATEID:
 321                 case -NFS4ERR_STALE_CLIENTID:
 322                         nfs4_schedule_lease_recovery(clp);
 323                         goto wait_on_recovery;
 324 #if defined(CONFIG_NFS_V4_1)
 325                 case -NFS4ERR_BADSESSION:
 326                 case -NFS4ERR_BADSLOT:
 327                 case -NFS4ERR_BAD_HIGH_SLOT:
 328                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 329                 case -NFS4ERR_DEADSESSION:
 330                 case -NFS4ERR_SEQ_FALSE_RETRY:
 331                 case -NFS4ERR_SEQ_MISORDERED:
 332                         dprintk("%s ERROR: %d Reset session\n", __func__,
 333                                 errorcode);
 334                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 335                         goto wait_on_recovery;
 336 #endif /* defined(CONFIG_NFS_V4_1) */
 337                 case -NFS4ERR_FILE_OPEN:
 338                         if (exception->timeout > HZ) {
 339                                 /* We have retried a decent amount, time to
 340                                  * fail
 341                                  */
 342                                 ret = -EBUSY;
 343                                 break;
 344                         }
 345                 case -NFS4ERR_GRACE:
 346                 case -NFS4ERR_DELAY:
 347                         ret = nfs4_delay(server->client, &exception->timeout);
 348                         if (ret != 0)
 349                                 break;
 350                 case -NFS4ERR_RETRY_UNCACHED_REP:
 351                 case -NFS4ERR_OLD_STATEID:
 352                         exception->retry = 1;
 353                         break;
 354                 case -NFS4ERR_BADOWNER:
 355                         /* The following works around a Linux server bug! */
 356                 case -NFS4ERR_BADNAME:
 357                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 358                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 359                                 exception->retry = 1;
 360                                 printk(KERN_WARNING "NFS: v4 server %s "
 361                                                 "does not accept raw "
 362                                                 "uid/gids. "
 363                                                 "Reenabling the idmapper.\n",
 364                                                 server->nfs_client->cl_hostname);
 365                         }
 366         }
 367         /* We failed to handle the error */
 368         return nfs4_map_errors(ret);
 369 wait_on_recovery:
 370         ret = nfs4_wait_clnt_recover(clp);
 371         if (ret == 0)
 372                 exception->retry = 1;
 373         return ret;
 374 }
 375
 376
 377 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 378 {
 379         spin_lock(&clp->cl_lock);
 380         if (time_before(clp->cl_last_renewal,timestamp))
 381                 clp->cl_last_renewal = timestamp;
 382         spin_unlock(&clp->cl_lock);
 383 }
 384
 385 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 386 {
 387         do_renew_lease(server->nfs_client, timestamp);
 388 }
 389
 390 #if defined(CONFIG_NFS_V4_1)
 391
 392 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 393 {
 394         struct nfs4_session *session;
 395         struct nfs4_slot_table *tbl;
 396         bool send_new_highest_used_slotid = false;
 397
 398         if (!res->sr_slot) {
 399                 /* just wake up the next guy waiting since
 400                  * we may have not consumed a slot after all */
 401                 dprintk("%s: No slot\n", __func__);
 402                 return;
 403         }
 404         tbl = res->sr_slot->table;
 405         session = tbl->session;
 406
 407         spin_lock(&tbl->slot_tbl_lock);
 408         /* Be nice to the server: try to ensure that the last transmitted
 409          * value for highest_user_slotid <= target_highest_slotid
 410          */
 411         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 412                 send_new_highest_used_slotid = true;
 413
 414         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 415                 send_new_highest_used_slotid = false;
 416                 goto out_unlock;
 417         }
 418         nfs4_free_slot(tbl, res->sr_slot);
 419
 420         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 421                 send_new_highest_used_slotid = false;
 422 out_unlock:
 423         spin_unlock(&tbl->slot_tbl_lock);
 424         res->sr_slot = NULL;
 425         if (send_new_highest_used_slotid)
 426                 nfs41_server_notify_highest_slotid_update(session->clp);
 427 }
 428
 429 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 430 {
 431         struct nfs4_session *session;
 432         struct nfs4_slot *slot;
 433         struct nfs_client *clp;
 434         bool interrupted = false;
 435         int ret = 1;
 436
 437         /* don't increment the sequence number if the task wasn't sent */
 438         if (!RPC_WAS_SENT(task))
 439                 goto out;
 440
 441         slot = res->sr_slot;
 442         session = slot->table->session;
 443
 444         if (slot->interrupted) {
 445                 slot->interrupted = 0;
 446                 interrupted = true;
 447         }
 448
 449         /* Check the SEQUENCE operation status */
 450         switch (res->sr_status) {
 451         case 0:
 452                 /* Update the slot's sequence and clientid lease timer */
 453                 ++slot->seq_nr;
 454                 clp = session->clp;
 455                 do_renew_lease(clp, res->sr_timestamp);
 456                 /* Check sequence flags */
 457                 if (res->sr_status_flags != 0)
 458                         nfs4_schedule_lease_recovery(clp);
 459                 nfs41_update_target_slotid(slot->table, slot, res);
 460                 break;
 461         case 1:
 462                 /*
 463                  * sr_status remains 1 if an RPC level error occurred.
 464                  * The server may or may not have processed the sequence
 465                  * operation..
 466                  * Mark the slot as having hosted an interrupted RPC call.
 467                  */
 468                 slot->interrupted = 1;
 469                 goto out;
 470         case -NFS4ERR_DELAY:
 471                 /* The server detected a resend of the RPC call and
 472                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 473                  * of RFC5661.
 474                  */
 475                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 476                         __func__,
 477                         slot->slot_nr,
 478                         slot->seq_nr);
 479                 goto out_retry;
 480         case -NFS4ERR_BADSLOT:
 481                 /*
 482                  * The slot id we used was probably retired. Try again
 483                  * using a different slot id.
 484                  */
 485                 goto retry_nowait;
 486         case -NFS4ERR_SEQ_MISORDERED:
 487                 /*
 488                  * Was the last operation on this sequence interrupted?
 489                  * If so, retry after bumping the sequence number.
 490                  */
 491                 if (interrupted) {
 492                         ++slot->seq_nr;
 493                         goto retry_nowait;
 494                 }
 495                 /*
 496                  * Could this slot have been previously retired?
 497                  * If so, then the server may be expecting seq_nr = 1!
 498                  */
 499                 if (slot->seq_nr != 1) {
 500                         slot->seq_nr = 1;
 501                         goto retry_nowait;
 502                 }
 503                 break;
 504         case -NFS4ERR_SEQ_FALSE_RETRY:
 505                 ++slot->seq_nr;
 506                 goto retry_nowait;
 507         default:
 508                 /* Just update the slot sequence no. */
 509                 ++slot->seq_nr;
 510         }
 511 out:
 512         /* The session may be reset by one of the error handlers. */
 513         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 514         nfs41_sequence_free_slot(res);
 515         return ret;
 516 retry_nowait:
 517         if (rpc_restart_call_prepare(task)) {
 518                 task->tk_status = 0;
 519                 ret = 0;
 520         }
 521         goto out;
 522 out_retry:
 523         if (!rpc_restart_call(task))
 524                 goto out;
 525         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 526         return 0;
 527 }
 528
 529 static int nfs4_sequence_done(struct rpc_task *task,
 530                                struct nfs4_sequence_res *res)
 531 {
 532         if (res->sr_slot == NULL)
 533                 return 1;
 534         return nfs41_sequence_done(task, res);
 535 }
 536
 537 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 538                 struct nfs4_sequence_res *res, int cache_reply)
 539 {
 540         args->sa_slot = NULL;
 541         args->sa_cache_this = 0;
 542         args->sa_privileged = 0;
 543         if (cache_reply)
 544                 args->sa_cache_this = 1;
 545         res->sr_slot = NULL;
 546 }
 547
 548 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 549 {
 550         args->sa_privileged = 1;
 551 }
 552
 553 int nfs41_setup_sequence(struct nfs4_session *session,
 554                                 struct nfs4_sequence_args *args,
 555                                 struct nfs4_sequence_res *res,
 556                                 struct rpc_task *task)
 557 {
 558         struct nfs4_slot *slot;
 559         struct nfs4_slot_table *tbl;
 560
 561         dprintk("--> %s\n", __func__);
 562         /* slot already allocated? */
 563         if (res->sr_slot != NULL)
 564                 goto out_success;
 565
 566         tbl = &session->fc_slot_table;
 567
 568         task->tk_timeout = 0;
 569
 570         spin_lock(&tbl->slot_tbl_lock);
 571         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 572             !args->sa_privileged) {
 573                 /* The state manager will wait until the slot table is empty */
 574                 dprintk("%s session is draining\n", __func__);
 575                 goto out_sleep;
 576         }
 577
 578         slot = nfs4_alloc_slot(tbl);
 579         if (IS_ERR(slot)) {
 580                 /* If out of memory, try again in 1/4 second */
 581                 if (slot == ERR_PTR(-ENOMEM))
 582                         task->tk_timeout = HZ >> 2;
 583                 dprintk("<-- %s: no free slots\n", __func__);
 584                 goto out_sleep;
 585         }
 586         spin_unlock(&tbl->slot_tbl_lock);
 587
 588         args->sa_slot = slot;
 589
 590         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 591                         slot->slot_nr, slot->seq_nr);
 592
 593         res->sr_slot = slot;
 594         res->sr_timestamp = jiffies;
 595         res->sr_status_flags = 0;
 596         /*
 597          * sr_status is only set in decode_sequence, and so will remain
 598          * set to 1 if an rpc level failure occurs.
 599          */
 600         res->sr_status = 1;
 601 out_success:
 602         rpc_call_start(task);
 603         return 0;
 604 out_sleep:
 605         /* Privileged tasks are queued with top priority */
 606         if (args->sa_privileged)
 607                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 608                                 NULL, RPC_PRIORITY_PRIVILEGED);
 609         else
 610                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 611         spin_unlock(&tbl->slot_tbl_lock);
 612         return -EAGAIN;
 613 }
 614 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 615
 616 int nfs4_setup_sequence(const struct nfs_server *server,
 617                         struct nfs4_sequence_args *args,
 618                         struct nfs4_sequence_res *res,
 619                         struct rpc_task *task)
 620 {
 621         struct nfs4_session *session = nfs4_get_session(server);
 622         int ret = 0;
 623
 624         if (session == NULL) {
 625                 rpc_call_start(task);
 626                 goto out;
 627         }
 628
 629         dprintk("--> %s clp %p session %p sr_slot %d\n",
 630                 __func__, session->clp, session, res->sr_slot ?
 631                         res->sr_slot->slot_nr : -1);
 632
 633         ret = nfs41_setup_sequence(session, args, res, task);
 634 out:
 635         dprintk("<-- %s status=%d\n", __func__, ret);
 636         return ret;
 637 }
 638
 639 struct nfs41_call_sync_data {
 640         const struct nfs_server *seq_server;
 641         struct nfs4_sequence_args *seq_args;
 642         struct nfs4_sequence_res *seq_res;
 643 };
 644
 645 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 646 {
 647         struct nfs41_call_sync_data *data = calldata;
 648         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 649
 650         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 651
 652         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 653 }
 654
 655 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 656 {
 657         struct nfs41_call_sync_data *data = calldata;
 658
 659         nfs41_sequence_done(task, data->seq_res);
 660 }
 661
 662 static const struct rpc_call_ops nfs41_call_sync_ops = {
 663         .rpc_call_prepare = nfs41_call_sync_prepare,
 664         .rpc_call_done = nfs41_call_sync_done,
 665 };
 666
 667 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 668                                    struct nfs_server *server,
 669                                    struct rpc_message *msg,
 670                                    struct nfs4_sequence_args *args,
 671                                    struct nfs4_sequence_res *res)
 672 {
 673         int ret;
 674         struct rpc_task *task;
 675         struct nfs41_call_sync_data data = {
 676                 .seq_server = server,
 677                 .seq_args = args,
 678                 .seq_res = res,
 679         };
 680         struct rpc_task_setup task_setup = {
 681                 .rpc_client = clnt,
 682                 .rpc_message = msg,
 683                 .callback_ops = &nfs41_call_sync_ops,
 684                 .callback_data = &data
 685         };
 686
 687         task = rpc_run_task(&task_setup);
 688         if (IS_ERR(task))
 689                 ret = PTR_ERR(task);
 690         else {
 691                 ret = task->tk_status;
 692                 rpc_put_task(task);
 693         }
 694         return ret;
 695 }
 696
 697 #else
 698 static
 699 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 700                 struct nfs4_sequence_res *res, int cache_reply)
 701 {
 702 }
 703
 704 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 705 {
 706 }
 707
 708
 709 static int nfs4_sequence_done(struct rpc_task *task,
 710                                struct nfs4_sequence_res *res)
 711 {
 712         return 1;
 713 }
 714 #endif /* CONFIG_NFS_V4_1 */
 715
 716 static
 717 int _nfs4_call_sync(struct rpc_clnt *clnt,
 718                     struct nfs_server *server,
 719                     struct rpc_message *msg,
 720                     struct nfs4_sequence_args *args,
 721                     struct nfs4_sequence_res *res)
 722 {
 723         return rpc_call_sync(clnt, msg, 0);
 724 }
 725
 726 static
 727 int nfs4_call_sync(struct rpc_clnt *clnt,
 728                    struct nfs_server *server,
 729                    struct rpc_message *msg,
 730                    struct nfs4_sequence_args *args,
 731                    struct nfs4_sequence_res *res,
 732                    int cache_reply)
 733 {
 734         nfs41_init_sequence(args, res, cache_reply);
 735         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 736                                                 args, res);
 737 }
 738
 739 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 740 {
 741         struct nfs_inode *nfsi = NFS_I(dir);
 742
 743         spin_lock(&dir->i_lock);
 744         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 745         if (!cinfo->atomic || cinfo->before != dir->i_version)
 746                 nfs_force_lookup_revalidate(dir);
 747         dir->i_version = cinfo->after;
 748         nfs_fscache_invalidate(dir);
 749         spin_unlock(&dir->i_lock);
 750 }
 751
 752 struct nfs4_opendata {
 753         struct kref kref;
 754         struct nfs_openargs o_arg;
 755         struct nfs_openres o_res;
 756         struct nfs_open_confirmargs c_arg;
 757         struct nfs_open_confirmres c_res;
 758         struct nfs4_string owner_name;
 759         struct nfs4_string group_name;
 760         struct nfs_fattr f_attr;
 761         struct dentry *dir;
 762         struct dentry *dentry;
 763         struct nfs4_state_owner *owner;
 764         struct nfs4_state *state;
 765         struct iattr attrs;
 766         unsigned long timestamp;
 767         unsigned int rpc_done : 1;
 768         int rpc_status;
 769         int cancelled;
 770 };
 771
 772 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 773                 int err, struct nfs4_exception *exception)
 774 {
 775         if (err != -EINVAL)
 776                 return false;
 777         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 778                 return false;
 779         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 780         exception->retry = 1;
 781         return true;
 782 }
 783
 784 static enum open_claim_type4
 785 nfs4_map_atomic_open_claim(struct nfs_server *server,
 786                 enum open_claim_type4 claim)
 787 {
 788         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 789                 return claim;
 790         switch (claim) {
 791         default:
 792                 return claim;
 793         case NFS4_OPEN_CLAIM_FH:
 794                 return NFS4_OPEN_CLAIM_NULL;
 795         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 796                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 797         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 798                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 799         }
 800 }
 801
 802 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 803 {
 804         p->o_res.f_attr = &p->f_attr;
 805         p->o_res.seqid = p->o_arg.seqid;
 806         p->c_res.seqid = p->c_arg.seqid;
 807         p->o_res.server = p->o_arg.server;
 808         p->o_res.access_request = p->o_arg.access;
 809         nfs_fattr_init(&p->f_attr);
 810         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 811 }
 812
 813 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 814                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 815                 const struct iattr *attrs,
 816                 enum open_claim_type4 claim,
 817                 gfp_t gfp_mask)
 818 {
 819         struct dentry *parent = dget_parent(dentry);
 820         struct inode *dir = parent->d_inode;
 821         struct nfs_server *server = NFS_SERVER(dir);
 822         struct nfs4_opendata *p;
 823
 824         p = kzalloc(sizeof(*p), gfp_mask);
 825         if (p == NULL)
 826                 goto err;
 827         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 828         if (p->o_arg.seqid == NULL)
 829                 goto err_free;
 830         nfs_sb_active(dentry->d_sb);
 831         p->dentry = dget(dentry);
 832         p->dir = parent;
 833         p->owner = sp;
 834         atomic_inc(&sp->so_count);
 835         p->o_arg.open_flags = flags;
 836         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 837         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 838          * will return permission denied for all bits until close */
 839         if (!(flags & O_EXCL)) {
 840                 /* ask server to check for all possible rights as results
 841                  * are cached */
 842                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 843                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 844         }
 845         p->o_arg.clientid = server->nfs_client->cl_clientid;
 846         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 847         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 848         p->o_arg.name = &dentry->d_name;
 849         p->o_arg.server = server;
 850         p->o_arg.bitmask = server->attr_bitmask;
 851         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 852         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
 853         switch (p->o_arg.claim) {
 854         case NFS4_OPEN_CLAIM_NULL:
 855         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 856         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 857                 p->o_arg.fh = NFS_FH(dir);
 858                 break;
 859         case NFS4_OPEN_CLAIM_PREVIOUS:
 860         case NFS4_OPEN_CLAIM_FH:
 861         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 862         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 863                 p->o_arg.fh = NFS_FH(dentry->d_inode);
 864         }
 865         if (attrs != NULL && attrs->ia_valid != 0) {
 866                 __be32 verf[2];
 867
 868                 p->o_arg.u.attrs = &p->attrs;
 869                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 870
 871                 verf[0] = jiffies;
 872                 verf[1] = current->pid;
 873                 memcpy(p->o_arg.u.verifier.data, verf,
 874                                 sizeof(p->o_arg.u.verifier.data));
 875         }
 876         p->c_arg.fh = &p->o_res.fh;
 877         p->c_arg.stateid = &p->o_res.stateid;
 878         p->c_arg.seqid = p->o_arg.seqid;
 879         nfs4_init_opendata_res(p);
 880         kref_init(&p->kref);
 881         return p;
 882 err_free:
 883         kfree(p);
 884 err:
 885         dput(parent);
 886         return NULL;
 887 }
 888
 889 static void nfs4_opendata_free(struct kref *kref)
 890 {
 891         struct nfs4_opendata *p = container_of(kref,
 892                         struct nfs4_opendata, kref);
 893         struct super_block *sb = p->dentry->d_sb;
 894
 895         nfs_free_seqid(p->o_arg.seqid);
 896         if (p->state != NULL)
 897                 nfs4_put_open_state(p->state);
 898         nfs4_put_state_owner(p->owner);
 899         dput(p->dir);
 900         dput(p->dentry);
 901         nfs_sb_deactive(sb);
 902         nfs_fattr_free_names(&p->f_attr);
 903         kfree(p);
 904 }
 905
 906 static void nfs4_opendata_put(struct nfs4_opendata *p)
 907 {
 908         if (p != NULL)
 909                 kref_put(&p->kref, nfs4_opendata_free);
 910 }
 911
 912 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 913 {
 914         int ret;
 915
 916         ret = rpc_wait_for_completion_task(task);
 917         return ret;
 918 }
 919
 920 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 921 {
 922         int ret = 0;
 923
 924         if (open_mode & (O_EXCL|O_TRUNC))
 925                 goto out;
 926         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 927                 case FMODE_READ:
 928                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 929                                 && state->n_rdonly != 0;
 930                         break;
 931                 case FMODE_WRITE:
 932                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 933                                 && state->n_wronly != 0;
 934                         break;
 935                 case FMODE_READ|FMODE_WRITE:
 936                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 937                                 && state->n_rdwr != 0;
 938         }
 939 out:
 940         return ret;
 941 }
 942
 943 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 944 {
 945         if (delegation == NULL)
 946                 return 0;
 947         if ((delegation->type & fmode) != fmode)
 948                 return 0;
 949         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 950                 return 0;
 951         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
 952                 return 0;
 953         nfs_mark_delegation_referenced(delegation);
 954         return 1;
 955 }
 956
 957 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 958 {
 959         switch (fmode) {
 960                 case FMODE_WRITE:
 961                         state->n_wronly++;
 962                         break;
 963                 case FMODE_READ:
 964                         state->n_rdonly++;
 965                         break;
 966                 case FMODE_READ|FMODE_WRITE:
 967                         state->n_rdwr++;
 968         }
 969         nfs4_state_set_mode_locked(state, state->state | fmode);
 970 }
 971
 972 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 973 {
 974         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 975                 nfs4_stateid_copy(&state->stateid, stateid);
 976         nfs4_stateid_copy(&state->open_stateid, stateid);
 977         switch (fmode) {
 978                 case FMODE_READ:
 979                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 980                         break;
 981                 case FMODE_WRITE:
 982                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 983                         break;
 984                 case FMODE_READ|FMODE_WRITE:
 985                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 986         }
 987 }
 988
 989 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 990 {
 991         write_seqlock(&state->seqlock);
 992         nfs_set_open_stateid_locked(state, stateid, fmode);
 993         write_sequnlock(&state->seqlock);
 994 }
 995
 996 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 997 {
 998         /*
 999          * Protect the call to nfs4_state_set_mode_locked and
1000          * serialise the stateid update
1001          */
1002         write_seqlock(&state->seqlock);
1003         if (deleg_stateid != NULL) {
1004                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1005                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1006         }
1007         if (open_stateid != NULL)
1008                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1009         write_sequnlock(&state->seqlock);
1010         spin_lock(&state->owner->so_lock);
1011         update_open_stateflags(state, fmode);
1012         spin_unlock(&state->owner->so_lock);
1013 }
1014
1015 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1016 {
1017         struct nfs_inode *nfsi = NFS_I(state->inode);
1018         struct nfs_delegation *deleg_cur;
1019         int ret = 0;
1020
1021         fmode &= (FMODE_READ|FMODE_WRITE);
1022
1023         rcu_read_lock();
1024         deleg_cur = rcu_dereference(nfsi->delegation);
1025         if (deleg_cur == NULL)
1026                 goto no_delegation;
1027
1028         spin_lock(&deleg_cur->lock);
1029         if (nfsi->delegation != deleg_cur ||
1030            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1031             (deleg_cur->type & fmode) != fmode)
1032                 goto no_delegation_unlock;
1033
1034         if (delegation == NULL)
1035                 delegation = &deleg_cur->stateid;
1036         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1037                 goto no_delegation_unlock;
1038
1039         nfs_mark_delegation_referenced(deleg_cur);
1040         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1041         ret = 1;
1042 no_delegation_unlock:
1043         spin_unlock(&deleg_cur->lock);
1044 no_delegation:
1045         rcu_read_unlock();
1046
1047         if (!ret && open_stateid != NULL) {
1048                 __update_open_stateid(state, open_stateid, NULL, fmode);
1049                 ret = 1;
1050         }
1051
1052         return ret;
1053 }
1054
1055
1056 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1057 {
1058         struct nfs_delegation *delegation;
1059
1060         rcu_read_lock();
1061         delegation = rcu_dereference(NFS_I(inode)->delegation);
1062         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1063                 rcu_read_unlock();
1064                 return;
1065         }
1066         rcu_read_unlock();
1067         nfs4_inode_return_delegation(inode);
1068 }
1069
1070 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1071 {
1072         struct nfs4_state *state = opendata->state;
1073         struct nfs_inode *nfsi = NFS_I(state->inode);
1074         struct nfs_delegation *delegation;
1075         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1076         fmode_t fmode = opendata->o_arg.fmode;
1077         nfs4_stateid stateid;
1078         int ret = -EAGAIN;
1079
1080         for (;;) {
1081                 if (can_open_cached(state, fmode, open_mode)) {
1082                         spin_lock(&state->owner->so_lock);
1083                         if (can_open_cached(state, fmode, open_mode)) {
1084                                 update_open_stateflags(state, fmode);
1085                                 spin_unlock(&state->owner->so_lock);
1086                                 goto out_return_state;
1087                         }
1088                         spin_unlock(&state->owner->so_lock);
1089                 }
1090                 rcu_read_lock();
1091                 delegation = rcu_dereference(nfsi->delegation);
1092                 if (!can_open_delegated(delegation, fmode)) {
1093                         rcu_read_unlock();
1094                         break;
1095                 }
1096                 /* Save the delegation */
1097                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1098                 rcu_read_unlock();
1099                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1100                 if (ret != 0)
1101                         goto out;
1102                 ret = -EAGAIN;
1103
1104                 /* Try to update the stateid using the delegation */
1105                 if (update_open_stateid(state, NULL, &stateid, fmode))
1106                         goto out_return_state;
1107         }
1108 out:
1109         return ERR_PTR(ret);
1110 out_return_state:
1111         atomic_inc(&state->count);
1112         return state;
1113 }
1114
1115 static void
1116 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1117 {
1118         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1119         struct nfs_delegation *delegation;
1120         int delegation_flags = 0;
1121
1122         rcu_read_lock();
1123         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1124         if (delegation)
1125                 delegation_flags = delegation->flags;
1126         rcu_read_unlock();
1127         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1128                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1129                                    "returning a delegation for "
1130                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1131                                    clp->cl_hostname);
1132         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1133                 nfs_inode_set_delegation(state->inode,
1134                                          data->owner->so_cred,
1135                                          &data->o_res);
1136         else
1137                 nfs_inode_reclaim_delegation(state->inode,
1138                                              data->owner->so_cred,
1139                                              &data->o_res);
1140 }
1141
1142 /*
1143  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1144  * and update the nfs4_state.
1145  */
1146 static struct nfs4_state *
1147 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1148 {
1149         struct inode *inode = data->state->inode;
1150         struct nfs4_state *state = data->state;
1151         int ret;
1152
1153         if (!data->rpc_done) {
1154                 ret = data->rpc_status;
1155                 goto err;
1156         }
1157
1158         ret = -ESTALE;
1159         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1160             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1161             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1162                 goto err;
1163
1164         ret = -ENOMEM;
1165         state = nfs4_get_open_state(inode, data->owner);
1166         if (state == NULL)
1167                 goto err;
1168
1169         ret = nfs_refresh_inode(inode, &data->f_attr);
1170         if (ret)
1171                 goto err;
1172
1173         if (data->o_res.delegation_type != 0)
1174                 nfs4_opendata_check_deleg(data, state);
1175         update_open_stateid(state, &data->o_res.stateid, NULL,
1176                             data->o_arg.fmode);
1177
1178         return state;
1179 err:
1180         return ERR_PTR(ret);
1181
1182 }
1183
1184 static struct nfs4_state *
1185 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1186 {
1187         struct inode *inode;
1188         struct nfs4_state *state = NULL;
1189         int ret;
1190
1191         if (!data->rpc_done) {
1192                 state = nfs4_try_open_cached(data);
1193                 goto out;
1194         }
1195
1196         ret = -EAGAIN;
1197         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1198                 goto err;
1199         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1200         ret = PTR_ERR(inode);
1201         if (IS_ERR(inode))
1202                 goto err;
1203         ret = -ENOMEM;
1204         state = nfs4_get_open_state(inode, data->owner);
1205         if (state == NULL)
1206                 goto err_put_inode;
1207         if (data->o_res.delegation_type != 0)
1208                 nfs4_opendata_check_deleg(data, state);
1209         update_open_stateid(state, &data->o_res.stateid, NULL,
1210                         data->o_arg.fmode);
1211         iput(inode);
1212 out:
1213         nfs_release_seqid(data->o_arg.seqid);
1214         return state;
1215 err_put_inode:
1216         iput(inode);
1217 err:
1218         return ERR_PTR(ret);
1219 }
1220
1221 static struct nfs4_state *
1222 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1223 {
1224         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1225                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1226         return _nfs4_opendata_to_nfs4_state(data);
1227 }
1228
1229 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1230 {
1231         struct nfs_inode *nfsi = NFS_I(state->inode);
1232         struct nfs_open_context *ctx;
1233
1234         spin_lock(&state->inode->i_lock);
1235         list_for_each_entry(ctx, &nfsi->open_files, list) {
1236                 if (ctx->state != state)
1237                         continue;
1238                 get_nfs_open_context(ctx);
1239                 spin_unlock(&state->inode->i_lock);
1240                 return ctx;
1241         }
1242         spin_unlock(&state->inode->i_lock);
1243         return ERR_PTR(-ENOENT);
1244 }
1245
1246 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1247                 struct nfs4_state *state, enum open_claim_type4 claim)
1248 {
1249         struct nfs4_opendata *opendata;
1250
1251         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1252                         NULL, claim, GFP_NOFS);
1253         if (opendata == NULL)
1254                 return ERR_PTR(-ENOMEM);
1255         opendata->state = state;
1256         atomic_inc(&state->count);
1257         return opendata;
1258 }
1259
1260 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1261 {
1262         struct nfs4_state *newstate;
1263         int ret;
1264
1265         opendata->o_arg.open_flags = 0;
1266         opendata->o_arg.fmode = fmode;
1267         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1268         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1269         nfs4_init_opendata_res(opendata);
1270         ret = _nfs4_recover_proc_open(opendata);
1271         if (ret != 0)
1272                 return ret;
1273         newstate = nfs4_opendata_to_nfs4_state(opendata);
1274         if (IS_ERR(newstate))
1275                 return PTR_ERR(newstate);
1276         nfs4_close_state(newstate, fmode);
1277         *res = newstate;
1278         return 0;
1279 }
1280
1281 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1282 {
1283         struct nfs4_state *newstate;
1284         int ret;
1285
1286         /* memory barrier prior to reading state->n_* */
1287         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1288         smp_rmb();
1289         if (state->n_rdwr != 0) {
1290                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1291                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1292                 if (ret != 0)
1293                         return ret;
1294                 if (newstate != state)
1295                         return -ESTALE;
1296         }
1297         if (state->n_wronly != 0) {
1298                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1299                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1300                 if (ret != 0)
1301                         return ret;
1302                 if (newstate != state)
1303                         return -ESTALE;
1304         }
1305         if (state->n_rdonly != 0) {
1306                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1307                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1308                 if (ret != 0)
1309                         return ret;
1310                 if (newstate != state)
1311                         return -ESTALE;
1312         }
1313         /*
1314          * We may have performed cached opens for all three recoveries.
1315          * Check if we need to update the current stateid.
1316          */
1317         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1318             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1319                 write_seqlock(&state->seqlock);
1320                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1321                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1322                 write_sequnlock(&state->seqlock);
1323         }
1324         return 0;
1325 }
1326
1327 /*
1328  * OPEN_RECLAIM:
1329  *      reclaim state on the server after a reboot.
1330  */
1331 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1332 {
1333         struct nfs_delegation *delegation;
1334         struct nfs4_opendata *opendata;
1335         fmode_t delegation_type = 0;
1336         int status;
1337
1338         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1339                         NFS4_OPEN_CLAIM_PREVIOUS);
1340         if (IS_ERR(opendata))
1341                 return PTR_ERR(opendata);
1342         rcu_read_lock();
1343         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1344         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1345                 delegation_type = delegation->type;
1346         rcu_read_unlock();
1347         opendata->o_arg.u.delegation_type = delegation_type;
1348         status = nfs4_open_recover(opendata, state);
1349         nfs4_opendata_put(opendata);
1350         return status;
1351 }
1352
1353 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1354 {
1355         struct nfs_server *server = NFS_SERVER(state->inode);
1356         struct nfs4_exception exception = { };
1357         int err;
1358         do {
1359                 err = _nfs4_do_open_reclaim(ctx, state);
1360                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1361                         continue;
1362                 if (err != -NFS4ERR_DELAY)
1363                         break;
1364                 nfs4_handle_exception(server, err, &exception);
1365         } while (exception.retry);
1366         return err;
1367 }
1368
1369 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1370 {
1371         struct nfs_open_context *ctx;
1372         int ret;
1373
1374         ctx = nfs4_state_find_open_context(state);
1375         if (IS_ERR(ctx))
1376                 return -EAGAIN;
1377         ret = nfs4_do_open_reclaim(ctx, state);
1378         put_nfs_open_context(ctx);
1379         return ret;
1380 }
1381
1382 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1383 {
1384         struct nfs_server *server = NFS_SERVER(state->inode);
1385         struct nfs4_opendata *opendata;
1386         int err;
1387
1388         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1389                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1390         if (IS_ERR(opendata))
1391                 return PTR_ERR(opendata);
1392         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1393         err = nfs4_open_recover(opendata, state);
1394         nfs4_opendata_put(opendata);
1395         switch (err) {
1396                 default:
1397                         printk(KERN_ERR "NFS: %s: unhandled error "
1398                                         "%d.\n", __func__, err);
1399                 case 0:
1400                 case -ENOENT:
1401                 case -ESTALE:
1402                         break;
1403                 case -NFS4ERR_BADSESSION:
1404                 case -NFS4ERR_BADSLOT:
1405                 case -NFS4ERR_BAD_HIGH_SLOT:
1406                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1407                 case -NFS4ERR_DEADSESSION:
1408                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1409                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1410                         return -EAGAIN;
1411                 case -NFS4ERR_STALE_CLIENTID:
1412                 case -NFS4ERR_STALE_STATEID:
1413                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1414                 case -NFS4ERR_EXPIRED:
1415                         /* Don't recall a delegation if it was lost */
1416                         nfs4_schedule_lease_recovery(server->nfs_client);
1417                         return -EAGAIN;
1418                 case -NFS4ERR_DELEG_REVOKED:
1419                 case -NFS4ERR_ADMIN_REVOKED:
1420                 case -NFS4ERR_BAD_STATEID:
1421                         nfs_inode_find_state_and_recover(state->inode,
1422                                         stateid);
1423                         nfs4_schedule_stateid_recovery(server, state);
1424                 case -ENOMEM:
1425                         return 0;
1426                 case -NFS4ERR_DELAY:
1427                 case -NFS4ERR_GRACE:
1428                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1429                         ssleep(1);
1430                         return -EAGAIN;
1431         }
1432         return err;
1433 }
1434
1435 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1436 {
1437         struct nfs4_opendata *data = calldata;
1438
1439         data->rpc_status = task->tk_status;
1440         if (data->rpc_status == 0) {
1441                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1442                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1443                 renew_lease(data->o_res.server, data->timestamp);
1444                 data->rpc_done = 1;
1445         }
1446 }
1447
1448 static void nfs4_open_confirm_release(void *calldata)
1449 {
1450         struct nfs4_opendata *data = calldata;
1451         struct nfs4_state *state = NULL;
1452
1453         /* If this request hasn't been cancelled, do nothing */
1454         if (data->cancelled == 0)
1455                 goto out_free;
1456         /* In case of error, no cleanup! */
1457         if (!data->rpc_done)
1458                 goto out_free;
1459         state = nfs4_opendata_to_nfs4_state(data);
1460         if (!IS_ERR(state))
1461                 nfs4_close_state(state, data->o_arg.fmode);
1462 out_free:
1463         nfs4_opendata_put(data);
1464 }
1465
1466 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1467         .rpc_call_done = nfs4_open_confirm_done,
1468         .rpc_release = nfs4_open_confirm_release,
1469 };
1470
1471 /*
1472  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1473  */
1474 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1475 {
1476         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1477         struct rpc_task *task;
1478         struct  rpc_message msg = {
1479                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1480                 .rpc_argp = &data->c_arg,
1481                 .rpc_resp = &data->c_res,
1482                 .rpc_cred = data->owner->so_cred,
1483         };
1484         struct rpc_task_setup task_setup_data = {
1485                 .rpc_client = server->client,
1486                 .rpc_message = &msg,
1487                 .callback_ops = &nfs4_open_confirm_ops,
1488                 .callback_data = data,
1489                 .workqueue = nfsiod_workqueue,
1490                 .flags = RPC_TASK_ASYNC,
1491         };
1492         int status;
1493
1494         kref_get(&data->kref);
1495         data->rpc_done = 0;
1496         data->rpc_status = 0;
1497         data->timestamp = jiffies;
1498         task = rpc_run_task(&task_setup_data);
1499         if (IS_ERR(task))
1500                 return PTR_ERR(task);
1501         status = nfs4_wait_for_completion_rpc_task(task);
1502         if (status != 0) {
1503                 data->cancelled = 1;
1504                 smp_wmb();
1505         } else
1506                 status = data->rpc_status;
1507         rpc_put_task(task);
1508         return status;
1509 }
1510
1511 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1512 {
1513         struct nfs4_opendata *data = calldata;
1514         struct nfs4_state_owner *sp = data->owner;
1515
1516         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1517                 goto out_wait;
1518         /*
1519          * Check if we still need to send an OPEN call, or if we can use
1520          * a delegation instead.
1521          */
1522         if (data->state != NULL) {
1523                 struct nfs_delegation *delegation;
1524
1525                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1526                         goto out_no_action;
1527                 rcu_read_lock();
1528                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1529                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1530                     can_open_delegated(delegation, data->o_arg.fmode))
1531                         goto unlock_no_action;
1532                 rcu_read_unlock();
1533         }
1534         /* Update client id. */
1535         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1536         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1537                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1538                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1539                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1540         }
1541         data->timestamp = jiffies;
1542         if (nfs4_setup_sequence(data->o_arg.server,
1543                                 &data->o_arg.seq_args,
1544                                 &data->o_res.seq_res,
1545                                 task) != 0)
1546                 nfs_release_seqid(data->o_arg.seqid);
1547         return;
1548 unlock_no_action:
1549         rcu_read_unlock();
1550 out_no_action:
1551         task->tk_action = NULL;
1552 out_wait:
1553         nfs4_sequence_done(task, &data->o_res.seq_res);
1554 }
1555
1556 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1557 {
1558         struct nfs4_opendata *data = calldata;
1559
1560         data->rpc_status = task->tk_status;
1561
1562         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1563                 return;
1564
1565         if (task->tk_status == 0) {
1566                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1567                         switch (data->o_res.f_attr->mode & S_IFMT) {
1568                         case S_IFREG:
1569                                 break;
1570                         case S_IFLNK:
1571                                 data->rpc_status = -ELOOP;
1572                                 break;
1573                         case S_IFDIR:
1574                                 data->rpc_status = -EISDIR;
1575                                 break;
1576                         default:
1577                                 data->rpc_status = -ENOTDIR;
1578                         }
1579                 }
1580                 renew_lease(data->o_res.server, data->timestamp);
1581                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1582                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1583         }
1584         data->rpc_done = 1;
1585 }
1586
1587 static void nfs4_open_release(void *calldata)
1588 {
1589         struct nfs4_opendata *data = calldata;
1590         struct nfs4_state *state = NULL;
1591
1592         /* If this request hasn't been cancelled, do nothing */
1593         if (data->cancelled == 0)
1594                 goto out_free;
1595         /* In case of error, no cleanup! */
1596         if (data->rpc_status != 0 || !data->rpc_done)
1597                 goto out_free;
1598         /* In case we need an open_confirm, no cleanup! */
1599         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1600                 goto out_free;
1601         state = nfs4_opendata_to_nfs4_state(data);
1602         if (!IS_ERR(state))
1603                 nfs4_close_state(state, data->o_arg.fmode);
1604 out_free:
1605         nfs4_opendata_put(data);
1606 }
1607
1608 static const struct rpc_call_ops nfs4_open_ops = {
1609         .rpc_call_prepare = nfs4_open_prepare,
1610         .rpc_call_done = nfs4_open_done,
1611         .rpc_release = nfs4_open_release,
1612 };
1613
1614 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1615 {
1616         struct inode *dir = data->dir->d_inode;
1617         struct nfs_server *server = NFS_SERVER(dir);
1618         struct nfs_openargs *o_arg = &data->o_arg;
1619         struct nfs_openres *o_res = &data->o_res;
1620         struct rpc_task *task;
1621         struct rpc_message msg = {
1622                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1623                 .rpc_argp = o_arg,
1624                 .rpc_resp = o_res,
1625                 .rpc_cred = data->owner->so_cred,
1626         };
1627         struct rpc_task_setup task_setup_data = {
1628                 .rpc_client = server->client,
1629                 .rpc_message = &msg,
1630                 .callback_ops = &nfs4_open_ops,
1631                 .callback_data = data,
1632                 .workqueue = nfsiod_workqueue,
1633                 .flags = RPC_TASK_ASYNC,
1634         };
1635         int status;
1636
1637         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1638         kref_get(&data->kref);
1639         data->rpc_done = 0;
1640         data->rpc_status = 0;
1641         data->cancelled = 0;
1642         if (isrecover)
1643                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1644         task = rpc_run_task(&task_setup_data);
1645         if (IS_ERR(task))
1646                 return PTR_ERR(task);
1647         status = nfs4_wait_for_completion_rpc_task(task);
1648         if (status != 0) {
1649                 data->cancelled = 1;
1650                 smp_wmb();
1651         } else
1652                 status = data->rpc_status;
1653         rpc_put_task(task);
1654
1655         return status;
1656 }
1657
1658 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1659 {
1660         struct inode *dir = data->dir->d_inode;
1661         struct nfs_openres *o_res = &data->o_res;
1662         int status;
1663
1664         status = nfs4_run_open_task(data, 1);
1665         if (status != 0 || !data->rpc_done)
1666                 return status;
1667
1668         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1669
1670         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1671                 status = _nfs4_proc_open_confirm(data);
1672                 if (status != 0)
1673                         return status;
1674         }
1675
1676         return status;
1677 }
1678
1679 static int nfs4_opendata_access(struct rpc_cred *cred,
1680                                 struct nfs4_opendata *opendata,
1681                                 struct nfs4_state *state, fmode_t fmode,
1682                                 int openflags)
1683 {
1684         struct nfs_access_entry cache;
1685         u32 mask;
1686
1687         /* access call failed or for some reason the server doesn't
1688          * support any access modes -- defer access call until later */
1689         if (opendata->o_res.access_supported == 0)
1690                 return 0;
1691
1692         mask = 0;
1693         /* don't check MAY_WRITE - a newly created file may not have
1694          * write mode bits, but POSIX allows the creating process to write.
1695          * use openflags to check for exec, because fmode won't
1696          * always have FMODE_EXEC set when file open for exec. */
1697         if (openflags & __FMODE_EXEC) {
1698                 /* ONLY check for exec rights */
1699                 mask = MAY_EXEC;
1700         } else if (fmode & FMODE_READ)
1701                 mask = MAY_READ;
1702
1703         cache.cred = cred;
1704         cache.jiffies = jiffies;
1705         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1706         nfs_access_add_cache(state->inode, &cache);
1707
1708         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1709                 return 0;
1710
1711         /* even though OPEN succeeded, access is denied. Close the file */
1712         nfs4_close_state(state, fmode);
1713         return -EACCES;
1714 }
1715
1716 /*
1717  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1718  */
1719 static int _nfs4_proc_open(struct nfs4_opendata *data)
1720 {
1721         struct inode *dir = data->dir->d_inode;
1722         struct nfs_server *server = NFS_SERVER(dir);
1723         struct nfs_openargs *o_arg = &data->o_arg;
1724         struct nfs_openres *o_res = &data->o_res;
1725         int status;
1726
1727         status = nfs4_run_open_task(data, 0);
1728         if (!data->rpc_done)
1729                 return status;
1730         if (status != 0) {
1731                 if (status == -NFS4ERR_BADNAME &&
1732                                 !(o_arg->open_flags & O_CREAT))
1733                         return -ENOENT;
1734                 return status;
1735         }
1736
1737         nfs_fattr_map_and_free_names(server, &data->f_attr);
1738
1739         if (o_arg->open_flags & O_CREAT)
1740                 update_changeattr(dir, &o_res->cinfo);
1741         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1742                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1743         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1744                 status = _nfs4_proc_open_confirm(data);
1745                 if (status != 0)
1746                         return status;
1747         }
1748         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1749                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1750         return 0;
1751 }
1752
1753 static int nfs4_recover_expired_lease(struct nfs_server *server)
1754 {
1755         return nfs4_client_recover_expired_lease(server->nfs_client);
1756 }
1757
1758 /*
1759  * OPEN_EXPIRED:
1760  *      reclaim state on the server after a network partition.
1761  *      Assumes caller holds the appropriate lock
1762  */
1763 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1764 {
1765         struct nfs4_opendata *opendata;
1766         int ret;
1767
1768         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1769                         NFS4_OPEN_CLAIM_FH);
1770         if (IS_ERR(opendata))
1771                 return PTR_ERR(opendata);
1772         ret = nfs4_open_recover(opendata, state);
1773         if (ret == -ESTALE)
1774                 d_drop(ctx->dentry);
1775         nfs4_opendata_put(opendata);
1776         return ret;
1777 }
1778
1779 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1780 {
1781         struct nfs_server *server = NFS_SERVER(state->inode);
1782         struct nfs4_exception exception = { };
1783         int err;
1784
1785         do {
1786                 err = _nfs4_open_expired(ctx, state);
1787                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1788                         continue;
1789                 switch (err) {
1790                 default:
1791                         goto out;
1792                 case -NFS4ERR_GRACE:
1793                 case -NFS4ERR_DELAY:
1794                         nfs4_handle_exception(server, err, &exception);
1795                         err = 0;
1796                 }
1797         } while (exception.retry);
1798 out:
1799         return err;
1800 }
1801
1802 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1803 {
1804         struct nfs_open_context *ctx;
1805         int ret;
1806
1807         ctx = nfs4_state_find_open_context(state);
1808         if (IS_ERR(ctx))
1809                 return -EAGAIN;
1810         ret = nfs4_do_open_expired(ctx, state);
1811         put_nfs_open_context(ctx);
1812         return ret;
1813 }
1814
1815 #if defined(CONFIG_NFS_V4_1)
1816 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1817 {
1818         struct nfs_server *server = NFS_SERVER(state->inode);
1819         nfs4_stateid *stateid = &state->stateid;
1820         int status;
1821
1822         /* If a state reset has been done, test_stateid is unneeded */
1823         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1824                 return;
1825
1826         status = nfs41_test_stateid(server, stateid);
1827         if (status != NFS_OK) {
1828                 /* Free the stateid unless the server explicitly
1829                  * informs us the stateid is unrecognized. */
1830                 if (status != -NFS4ERR_BAD_STATEID)
1831                         nfs41_free_stateid(server, stateid);
1832                 nfs_remove_bad_delegation(state->inode);
1833
1834                 write_seqlock(&state->seqlock);
1835                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1836                 write_sequnlock(&state->seqlock);
1837                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1838         }
1839 }
1840
1841 /**
1842  * nfs41_check_open_stateid - possibly free an open stateid
1843  *
1844  * @state: NFSv4 state for an inode
1845  *
1846  * Returns NFS_OK if recovery for this stateid is now finished.
1847  * Otherwise a negative NFS4ERR value is returned.
1848  */
1849 static int nfs41_check_open_stateid(struct nfs4_state *state)
1850 {
1851         struct nfs_server *server = NFS_SERVER(state->inode);
1852         nfs4_stateid *stateid = &state->open_stateid;
1853         int status;
1854
1855         /* If a state reset has been done, test_stateid is unneeded */
1856         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1857             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1858             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1859                 return -NFS4ERR_BAD_STATEID;
1860
1861         status = nfs41_test_stateid(server, stateid);
1862         if (status != NFS_OK) {
1863                 /* Free the stateid unless the server explicitly
1864                  * informs us the stateid is unrecognized. */
1865                 if (status != -NFS4ERR_BAD_STATEID)
1866                         nfs41_free_stateid(server, stateid);
1867
1868                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1869                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1870                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1871         }
1872         return status;
1873 }
1874
1875 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1876 {
1877         int status;
1878
1879         nfs41_clear_delegation_stateid(state);
1880         status = nfs41_check_open_stateid(state);
1881         if (status != NFS_OK)
1882                 status = nfs4_open_expired(sp, state);
1883         return status;
1884 }
1885 #endif
1886
1887 /*
1888  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1889  * fields corresponding to attributes that were used to store the verifier.
1890  * Make sure we clobber those fields in the later setattr call
1891  */
1892 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1893 {
1894         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1895             !(sattr->ia_valid & ATTR_ATIME_SET))
1896                 sattr->ia_valid |= ATTR_ATIME;
1897
1898         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1899             !(sattr->ia_valid & ATTR_MTIME_SET))
1900                 sattr->ia_valid |= ATTR_MTIME;
1901 }
1902
1903 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1904                 fmode_t fmode,
1905                 int flags,
1906                 struct nfs4_state **res)
1907 {
1908         struct nfs4_state_owner *sp = opendata->owner;
1909         struct nfs_server *server = sp->so_server;
1910         struct nfs4_state *state;
1911         unsigned int seq;
1912         int ret;
1913
1914         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1915
1916         ret = _nfs4_proc_open(opendata);
1917         if (ret != 0)
1918                 goto out;
1919
1920         state = nfs4_opendata_to_nfs4_state(opendata);
1921         ret = PTR_ERR(state);
1922         if (IS_ERR(state))
1923                 goto out;
1924         if (server->caps & NFS_CAP_POSIX_LOCK)
1925                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1926
1927         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1928         if (ret != 0)
1929                 goto out;
1930
1931         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
1932                 nfs4_schedule_stateid_recovery(server, state);
1933         *res = state;
1934 out:
1935         return ret;
1936 }
1937
1938 /*
1939  * Returns a referenced nfs4_state
1940  */
1941 static int _nfs4_do_open(struct inode *dir,
1942                         struct dentry *dentry,
1943                         fmode_t fmode,
1944                         int flags,
1945                         struct iattr *sattr,
1946                         struct rpc_cred *cred,
1947                         struct nfs4_state **res,
1948                         struct nfs4_threshold **ctx_th)
1949 {
1950         struct nfs4_state_owner  *sp;
1951         struct nfs4_state     *state = NULL;
1952         struct nfs_server       *server = NFS_SERVER(dir);
1953         struct nfs4_opendata *opendata;
1954         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
1955         int status;
1956
1957         /* Protect against reboot recovery conflicts */
1958         status = -ENOMEM;
1959         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1960         if (sp == NULL) {
1961                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1962                 goto out_err;
1963         }
1964         status = nfs4_recover_expired_lease(server);
1965         if (status != 0)
1966                 goto err_put_state_owner;
1967         if (dentry->d_inode != NULL)
1968                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1969         status = -ENOMEM;
1970         if (dentry->d_inode)
1971                 claim = NFS4_OPEN_CLAIM_FH;
1972         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
1973                         claim, GFP_KERNEL);
1974         if (opendata == NULL)
1975                 goto err_put_state_owner;
1976
1977         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1978                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1979                 if (!opendata->f_attr.mdsthreshold)
1980                         goto err_opendata_put;
1981                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1982         }
1983         if (dentry->d_inode != NULL)
1984                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1985
1986         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
1987         if (status != 0)
1988                 goto err_opendata_put;
1989
1990         if (opendata->o_arg.open_flags & O_EXCL) {
1991                 nfs4_exclusive_attrset(opendata, sattr);
1992
1993                 nfs_fattr_init(opendata->o_res.f_attr);
1994                 status = nfs4_do_setattr(state->inode, cred,
1995                                 opendata->o_res.f_attr, sattr,
1996                                 state);
1997                 if (status == 0)
1998                         nfs_setattr_update_inode(state->inode, sattr);
1999                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2000         }
2001
2002         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2003                 *ctx_th = opendata->f_attr.mdsthreshold;
2004         else
2005                 kfree(opendata->f_attr.mdsthreshold);
2006         opendata->f_attr.mdsthreshold = NULL;
2007
2008         nfs4_opendata_put(opendata);
2009         nfs4_put_state_owner(sp);
2010         *res = state;
2011         return 0;
2012 err_opendata_put:
2013         kfree(opendata->f_attr.mdsthreshold);
2014         nfs4_opendata_put(opendata);
2015 err_put_state_owner:
2016         nfs4_put_state_owner(sp);
2017 out_err:
2018         *res = NULL;
2019         return status;
2020 }
2021
2022
2023 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2024                                         struct dentry *dentry,
2025                                         fmode_t fmode,
2026                                         int flags,
2027                                         struct iattr *sattr,
2028                                         struct rpc_cred *cred,
2029                                         struct nfs4_threshold **ctx_th)
2030 {
2031         struct nfs_server *server = NFS_SERVER(dir);
2032         struct nfs4_exception exception = { };
2033         struct nfs4_state *res;
2034         int status;
2035
2036         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2037         do {
2038                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2039                                        &res, ctx_th);
2040                 if (status == 0)
2041                         break;
2042                 /* NOTE: BAD_SEQID means the server and client disagree about the
2043                  * book-keeping w.r.t. state-changing operations
2044                  * (OPEN/CLOSE/LOCK/LOCKU...)
2045                  * It is actually a sign of a bug on the client or on the server.
2046                  *
2047                  * If we receive a BAD_SEQID error in the particular case of
2048                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2049                  * have unhashed the old state_owner for us, and that we can
2050                  * therefore safely retry using a new one. We should still warn
2051                  * the user though...
2052                  */
2053                 if (status == -NFS4ERR_BAD_SEQID) {
2054                         pr_warn_ratelimited("NFS: v4 server %s "
2055                                         " returned a bad sequence-id error!\n",
2056                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2057                         exception.retry = 1;
2058                         continue;
2059                 }
2060                 /*
2061                  * BAD_STATEID on OPEN means that the server cancelled our
2062                  * state before it received the OPEN_CONFIRM.
2063                  * Recover by retrying the request as per the discussion
2064                  * on Page 181 of RFC3530.
2065                  */
2066                 if (status == -NFS4ERR_BAD_STATEID) {
2067                         exception.retry = 1;
2068                         continue;
2069                 }
2070                 if (status == -EAGAIN) {
2071                         /* We must have found a delegation */
2072                         exception.retry = 1;
2073                         continue;
2074                 }
2075                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2076                         continue;
2077                 res = ERR_PTR(nfs4_handle_exception(server,
2078                                         status, &exception));
2079         } while (exception.retry);
2080         return res;
2081 }
2082
2083 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2084                             struct nfs_fattr *fattr, struct iattr *sattr,
2085                             struct nfs4_state *state)
2086 {
2087         struct nfs_server *server = NFS_SERVER(inode);
2088         struct nfs_setattrargs  arg = {
2089                 .fh             = NFS_FH(inode),
2090                 .iap            = sattr,
2091                 .server         = server,
2092                 .bitmask = server->attr_bitmask,
2093         };
2094         struct nfs_setattrres  res = {
2095                 .fattr          = fattr,
2096                 .server         = server,
2097         };
2098         struct rpc_message msg = {
2099                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2100                 .rpc_argp       = &arg,
2101                 .rpc_resp       = &res,
2102                 .rpc_cred       = cred,
2103         };
2104         unsigned long timestamp = jiffies;
2105         int status;
2106
2107         nfs_fattr_init(fattr);
2108
2109         if (state != NULL && nfs4_valid_open_stateid(state)) {
2110                 struct nfs_lockowner lockowner = {
2111                         .l_owner = current->files,
2112                         .l_pid = current->tgid,
2113                 };
2114                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2115                                 &lockowner);
2116         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2117                                 FMODE_WRITE)) {
2118                 /* Use that stateid */
2119         } else
2120                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2121
2122         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2123         if (status == 0 && state != NULL)
2124                 renew_lease(server, timestamp);
2125         return status;
2126 }
2127
2128 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2129                            struct nfs_fattr *fattr, struct iattr *sattr,
2130                            struct nfs4_state *state)
2131 {
2132         struct nfs_server *server = NFS_SERVER(inode);
2133         struct nfs4_exception exception = {
2134                 .state = state,
2135                 .inode = inode,
2136         };
2137         int err;
2138         do {
2139                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2140                 switch (err) {
2141                 case -NFS4ERR_OPENMODE:
2142                         if (state && !(state->state & FMODE_WRITE)) {
2143                                 err = -EBADF;
2144                                 if (sattr->ia_valid & ATTR_OPEN)
2145                                         err = -EACCES;
2146                                 goto out;
2147                         }
2148                 }
2149                 err = nfs4_handle_exception(server, err, &exception);
2150         } while (exception.retry);
2151 out:
2152         return err;
2153 }
2154
2155 struct nfs4_closedata {
2156         struct inode *inode;
2157         struct nfs4_state *state;
2158         struct nfs_closeargs arg;
2159         struct nfs_closeres res;
2160         struct nfs_fattr fattr;
2161         unsigned long timestamp;
2162         bool roc;
2163         u32 roc_barrier;
2164 };
2165
2166 static void nfs4_free_closedata(void *data)
2167 {
2168         struct nfs4_closedata *calldata = data;
2169         struct nfs4_state_owner *sp = calldata->state->owner;
2170         struct super_block *sb = calldata->state->inode->i_sb;
2171
2172         if (calldata->roc)
2173                 pnfs_roc_release(calldata->state->inode);
2174         nfs4_put_open_state(calldata->state);
2175         nfs_free_seqid(calldata->arg.seqid);
2176         nfs4_put_state_owner(sp);
2177         nfs_sb_deactive(sb);
2178         kfree(calldata);
2179 }
2180
2181 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2182                 fmode_t fmode)
2183 {
2184         spin_lock(&state->owner->so_lock);
2185         if (!(fmode & FMODE_READ))
2186                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2187         if (!(fmode & FMODE_WRITE))
2188                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2189         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2190         spin_unlock(&state->owner->so_lock);
2191 }
2192
2193 static void nfs4_close_done(struct rpc_task *task, void *data)
2194 {
2195         struct nfs4_closedata *calldata = data;
2196         struct nfs4_state *state = calldata->state;
2197         struct nfs_server *server = NFS_SERVER(calldata->inode);
2198
2199         dprintk("%s: begin!\n", __func__);
2200         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2201                 return;
2202         /* hmm. we are done with the inode, and in the process of freeing
2203          * the state_owner. we keep this around to process errors
2204          */
2205         switch (task->tk_status) {
2206                 case 0:
2207                         if (calldata->roc)
2208                                 pnfs_roc_set_barrier(state->inode,
2209                                                      calldata->roc_barrier);
2210                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2211                         renew_lease(server, calldata->timestamp);
2212                         nfs4_close_clear_stateid_flags(state,
2213                                         calldata->arg.fmode);
2214                         break;
2215                 case -NFS4ERR_STALE_STATEID:
2216                 case -NFS4ERR_OLD_STATEID:
2217                 case -NFS4ERR_BAD_STATEID:
2218                 case -NFS4ERR_EXPIRED:
2219                         if (calldata->arg.fmode == 0)
2220                                 break;
2221                 default:
2222                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2223                                 rpc_restart_call_prepare(task);
2224         }
2225         nfs_release_seqid(calldata->arg.seqid);
2226         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2227         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2228 }
2229
2230 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2231 {
2232         struct nfs4_closedata *calldata = data;
2233         struct nfs4_state *state = calldata->state;
2234         struct inode *inode = calldata->inode;
2235         int call_close = 0;
2236
2237         dprintk("%s: begin!\n", __func__);
2238         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2239                 goto out_wait;
2240
2241         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2242         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2243         spin_lock(&state->owner->so_lock);
2244         /* Calculate the change in open mode */
2245         if (state->n_rdwr == 0) {
2246                 if (state->n_rdonly == 0) {
2247                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2248                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2249                         calldata->arg.fmode &= ~FMODE_READ;
2250                 }
2251                 if (state->n_wronly == 0) {
2252                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2253                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2254                         calldata->arg.fmode &= ~FMODE_WRITE;
2255                 }
2256         }
2257         if (!nfs4_valid_open_stateid(state))
2258                 call_close = 0;
2259         spin_unlock(&state->owner->so_lock);
2260
2261         if (!call_close) {
2262                 /* Note: exit _without_ calling nfs4_close_done */
2263                 goto out_no_action;
2264         }
2265
2266         if (calldata->arg.fmode == 0) {
2267                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2268                 if (calldata->roc &&
2269                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2270                         goto out_wait;
2271         }
2272
2273         nfs_fattr_init(calldata->res.fattr);
2274         calldata->timestamp = jiffies;
2275         if (nfs4_setup_sequence(NFS_SERVER(inode),
2276                                 &calldata->arg.seq_args,
2277                                 &calldata->res.seq_res,
2278                                 task) != 0)
2279                 nfs_release_seqid(calldata->arg.seqid);
2280         dprintk("%s: done!\n", __func__);
2281         return;
2282 out_no_action:
2283         task->tk_action = NULL;
2284 out_wait:
2285         nfs4_sequence_done(task, &calldata->res.seq_res);
2286 }
2287
2288 static const struct rpc_call_ops nfs4_close_ops = {
2289         .rpc_call_prepare = nfs4_close_prepare,
2290         .rpc_call_done = nfs4_close_done,
2291         .rpc_release = nfs4_free_closedata,
2292 };
2293
2294 /*
2295  * It is possible for data to be read/written from a mem-mapped file
2296  * after the sys_close call (which hits the vfs layer as a flush).
2297  * This means that we can't safely call nfsv4 close on a file until
2298  * the inode is cleared. This in turn means that we are not good
2299  * NFSv4 citizens - we do not indicate to the server to update the file's
2300  * share state even when we are done with one of the three share
2301  * stateid's in the inode.
2302  *
2303  * NOTE: Caller must be holding the sp->so_owner semaphore!
2304  */
2305 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2306 {
2307         struct nfs_server *server = NFS_SERVER(state->inode);
2308         struct nfs4_closedata *calldata;
2309         struct nfs4_state_owner *sp = state->owner;
2310         struct rpc_task *task;
2311         struct rpc_message msg = {
2312                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2313                 .rpc_cred = state->owner->so_cred,
2314         };
2315         struct rpc_task_setup task_setup_data = {
2316                 .rpc_client = server->client,
2317                 .rpc_message = &msg,
2318                 .callback_ops = &nfs4_close_ops,
2319                 .workqueue = nfsiod_workqueue,
2320                 .flags = RPC_TASK_ASYNC,
2321         };
2322         int status = -ENOMEM;
2323
2324         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2325         if (calldata == NULL)
2326                 goto out;
2327         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2328         calldata->inode = state->inode;
2329         calldata->state = state;
2330         calldata->arg.fh = NFS_FH(state->inode);
2331         calldata->arg.stateid = &state->open_stateid;
2332         /* Serialization for the sequence id */
2333         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2334         if (calldata->arg.seqid == NULL)
2335                 goto out_free_calldata;
2336         calldata->arg.fmode = 0;
2337         calldata->arg.bitmask = server->cache_consistency_bitmask;
2338         calldata->res.fattr = &calldata->fattr;
2339         calldata->res.seqid = calldata->arg.seqid;
2340         calldata->res.server = server;
2341         calldata->roc = pnfs_roc(state->inode);
2342         nfs_sb_active(calldata->inode->i_sb);
2343
2344         msg.rpc_argp = &calldata->arg;
2345         msg.rpc_resp = &calldata->res;
2346         task_setup_data.callback_data = calldata;
2347         task = rpc_run_task(&task_setup_data);
2348         if (IS_ERR(task))
2349                 return PTR_ERR(task);
2350         status = 0;
2351         if (wait)
2352                 status = rpc_wait_for_completion_task(task);
2353         rpc_put_task(task);
2354         return status;
2355 out_free_calldata:
2356         kfree(calldata);
2357 out:
2358         nfs4_put_open_state(state);
2359         nfs4_put_state_owner(sp);
2360         return status;
2361 }
2362
2363 static struct inode *
2364 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2365 {
2366         struct nfs4_state *state;
2367
2368         /* Protect against concurrent sillydeletes */
2369         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2370                              ctx->cred, &ctx->mdsthreshold);
2371         if (IS_ERR(state))
2372                 return ERR_CAST(state);
2373         ctx->state = state;
2374         return igrab(state->inode);
2375 }
2376
2377 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2378 {
2379         if (ctx->state == NULL)
2380                 return;
2381         if (is_sync)
2382                 nfs4_close_sync(ctx->state, ctx->mode);
2383         else
2384                 nfs4_close_state(ctx->state, ctx->mode);
2385 }
2386
2387 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2388 {
2389         struct nfs4_server_caps_arg args = {
2390                 .fhandle = fhandle,
2391         };
2392         struct nfs4_server_caps_res res = {};
2393         struct rpc_message msg = {
2394                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2395                 .rpc_argp = &args,
2396                 .rpc_resp = &res,
2397         };
2398         int status;
2399
2400         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2401         if (status == 0) {
2402                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2403                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2404                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2405                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2406                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2407                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2408                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2409                         server->caps |= NFS_CAP_ACLS;
2410                 if (res.has_links != 0)
2411                         server->caps |= NFS_CAP_HARDLINKS;
2412                 if (res.has_symlinks != 0)
2413                         server->caps |= NFS_CAP_SYMLINKS;
2414                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2415                         server->caps |= NFS_CAP_FILEID;
2416                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2417                         server->caps |= NFS_CAP_MODE;
2418                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2419                         server->caps |= NFS_CAP_NLINK;
2420                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2421                         server->caps |= NFS_CAP_OWNER;
2422                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2423                         server->caps |= NFS_CAP_OWNER_GROUP;
2424                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2425                         server->caps |= NFS_CAP_ATIME;
2426                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2427                         server->caps |= NFS_CAP_CTIME;
2428                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2429                         server->caps |= NFS_CAP_MTIME;
2430
2431                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2432                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2433                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2434                 server->acl_bitmask = res.acl_bitmask;
2435                 server->fh_expire_type = res.fh_expire_type;
2436         }
2437
2438         return status;
2439 }
2440
2441 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2442 {
2443         struct nfs4_exception exception = { };
2444         int err;
2445         do {
2446                 err = nfs4_handle_exception(server,
2447                                 _nfs4_server_capabilities(server, fhandle),
2448                                 &exception);
2449         } while (exception.retry);
2450         return err;
2451 }
2452
2453 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2454                 struct nfs_fsinfo *info)
2455 {
2456         struct nfs4_lookup_root_arg args = {
2457                 .bitmask = nfs4_fattr_bitmap,
2458         };
2459         struct nfs4_lookup_res res = {
2460                 .server = server,
2461                 .fattr = info->fattr,
2462                 .fh = fhandle,
2463         };
2464         struct rpc_message msg = {
2465                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2466                 .rpc_argp = &args,
2467                 .rpc_resp = &res,
2468         };
2469
2470         nfs_fattr_init(info->fattr);
2471         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2472 }
2473
2474 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2475                 struct nfs_fsinfo *info)
2476 {
2477         struct nfs4_exception exception = { };
2478         int err;
2479         do {
2480                 err = _nfs4_lookup_root(server, fhandle, info);
2481                 switch (err) {
2482                 case 0:
2483                 case -NFS4ERR_WRONGSEC:
2484                         goto out;
2485                 default:
2486                         err = nfs4_handle_exception(server, err, &exception);
2487                 }
2488         } while (exception.retry);
2489 out:
2490         return err;
2491 }
2492
2493 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2494                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2495 {
2496         struct rpc_auth *auth;
2497         int ret;
2498
2499         auth = rpcauth_create(flavor, server->client);
2500         if (IS_ERR(auth)) {
2501                 ret = -EIO;
2502                 goto out;
2503         }
2504         ret = nfs4_lookup_root(server, fhandle, info);
2505 out:
2506         return ret;
2507 }
2508
2509 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2510                               struct nfs_fsinfo *info)
2511 {
2512         int i, len, status = 0;
2513         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2514
2515         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2516         if (len < 0)
2517                 return len;
2518
2519         for (i = 0; i < len; i++) {
2520                 /* AUTH_UNIX is the default flavor if none was specified,
2521                  * thus has already been tried. */
2522                 if (flav_array[i] == RPC_AUTH_UNIX)
2523                         continue;
2524
2525                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2526                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2527                         continue;
2528                 break;
2529         }
2530         /*
2531          * -EACCESS could mean that the user doesn't have correct permissions
2532          * to access the mount.  It could also mean that we tried to mount
2533          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2534          * existing mount programs don't handle -EACCES very well so it should
2535          * be mapped to -EPERM instead.
2536          */
2537         if (status == -EACCES)
2538                 status = -EPERM;
2539         return status;
2540 }
2541
2542 /*
2543  * get the file handle for the "/" directory on the server
2544  */
2545 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2546                          struct nfs_fsinfo *info)
2547 {
2548         int minor_version = server->nfs_client->cl_minorversion;
2549         int status = nfs4_lookup_root(server, fhandle, info);
2550         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2551                 /*
2552                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2553                  * by nfs4_map_errors() as this function exits.
2554                  */
2555                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2556         if (status == 0)
2557                 status = nfs4_server_capabilities(server, fhandle);
2558         if (status == 0)
2559                 status = nfs4_do_fsinfo(server, fhandle, info);
2560         return nfs4_map_errors(status);
2561 }
2562
2563 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2564                               struct nfs_fsinfo *info)
2565 {
2566         int error;
2567         struct nfs_fattr *fattr = info->fattr;
2568
2569         error = nfs4_server_capabilities(server, mntfh);
2570         if (error < 0) {
2571                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2572                 return error;
2573         }
2574
2575         error = nfs4_proc_getattr(server, mntfh, fattr);
2576         if (error < 0) {
2577                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2578                 return error;
2579         }
2580
2581         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2582             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2583                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2584
2585         return error;
2586 }
2587
2588 /*
2589  * Get locations and (maybe) other attributes of a referral.
2590  * Note that we'll actually follow the referral later when
2591  * we detect fsid mismatch in inode revalidation
2592  */
2593 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2594                              const struct qstr *name, struct nfs_fattr *fattr,
2595                              struct nfs_fh *fhandle)
2596 {
2597         int status = -ENOMEM;
2598         struct page *page = NULL;
2599         struct nfs4_fs_locations *locations = NULL;
2600
2601         page = alloc_page(GFP_KERNEL);
2602         if (page == NULL)
2603                 goto out;
2604         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2605         if (locations == NULL)
2606                 goto out;
2607
2608         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2609         if (status != 0)
2610                 goto out;
2611         /* Make sure server returned a different fsid for the referral */
2612         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2613                 dprintk("%s: server did not return a different fsid for"
2614                         " a referral at %s\n", __func__, name->name);
2615                 status = -EIO;
2616                 goto out;
2617         }
2618         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2619         nfs_fixup_referral_attributes(&locations->fattr);
2620
2621         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2622         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2623         memset(fhandle, 0, sizeof(struct nfs_fh));
2624 out:
2625         if (page)
2626                 __free_page(page);
2627         kfree(locations);
2628         return status;
2629 }
2630
2631 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2632 {
2633         struct nfs4_getattr_arg args = {
2634                 .fh = fhandle,
2635                 .bitmask = server->attr_bitmask,
2636         };
2637         struct nfs4_getattr_res res = {
2638                 .fattr = fattr,
2639                 .server = server,
2640         };
2641         struct rpc_message msg = {
2642                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2643                 .rpc_argp = &args,
2644                 .rpc_resp = &res,
2645         };
2646
2647         nfs_fattr_init(fattr);
2648         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2649 }
2650
2651 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2652 {
2653         struct nfs4_exception exception = { };
2654         int err;
2655         do {
2656                 err = nfs4_handle_exception(server,
2657                                 _nfs4_proc_getattr(server, fhandle, fattr),
2658                                 &exception);
2659         } while (exception.retry);
2660         return err;
2661 }
2662
2663 /*
2664  * The file is not closed if it is opened due to the a request to change
2665  * the size of the file. The open call will not be needed once the
2666  * VFS layer lookup-intents are implemented.
2667  *
2668  * Close is called when the inode is destroyed.
2669  * If we haven't opened the file for O_WRONLY, we
2670  * need to in the size_change case to obtain a stateid.
2671  *
2672  * Got race?
2673  * Because OPEN is always done by name in nfsv4, it is
2674  * possible that we opened a different file by the same
2675  * name.  We can recognize this race condition, but we
2676  * can't do anything about it besides returning an error.
2677  *
2678  * This will be fixed with VFS changes (lookup-intent).
2679  */
2680 static int
2681 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2682                   struct iattr *sattr)
2683 {
2684         struct inode *inode = dentry->d_inode;
2685         struct rpc_cred *cred = NULL;
2686         struct nfs4_state *state = NULL;
2687         int status;
2688
2689         if (pnfs_ld_layoutret_on_setattr(inode))
2690                 pnfs_commit_and_return_layout(inode);
2691
2692         nfs_fattr_init(fattr);
2693
2694         /* Deal with open(O_TRUNC) */
2695         if (sattr->ia_valid & ATTR_OPEN)
2696                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2697
2698         /* Optimization: if the end result is no change, don't RPC */
2699         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2700                 return 0;
2701
2702         /* Search for an existing open(O_WRITE) file */
2703         if (sattr->ia_valid & ATTR_FILE) {
2704                 struct nfs_open_context *ctx;
2705
2706                 ctx = nfs_file_open_context(sattr->ia_file);
2707                 if (ctx) {
2708                         cred = ctx->cred;
2709                         state = ctx->state;
2710                 }
2711         }
2712
2713         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2714         if (status == 0)
2715                 nfs_setattr_update_inode(inode, sattr);
2716         return status;
2717 }
2718
2719 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2720                 const struct qstr *name, struct nfs_fh *fhandle,
2721                 struct nfs_fattr *fattr)
2722 {
2723         struct nfs_server *server = NFS_SERVER(dir);
2724         int                    status;
2725         struct nfs4_lookup_arg args = {
2726                 .bitmask = server->attr_bitmask,
2727                 .dir_fh = NFS_FH(dir),
2728                 .name = name,
2729         };
2730         struct nfs4_lookup_res res = {
2731                 .server = server,
2732                 .fattr = fattr,
2733                 .fh = fhandle,
2734         };
2735         struct rpc_message msg = {
2736                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2737                 .rpc_argp = &args,
2738                 .rpc_resp = &res,
2739         };
2740
2741         nfs_fattr_init(fattr);
2742
2743         dprintk("NFS call  lookup %s\n", name->name);
2744         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2745         dprintk("NFS reply lookup: %d\n", status);
2746         return status;
2747 }
2748
2749 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2750 {
2751         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2752                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2753         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2754         fattr->nlink = 2;
2755 }
2756
2757 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2758                                    struct qstr *name, struct nfs_fh *fhandle,
2759                                    struct nfs_fattr *fattr)
2760 {
2761         struct nfs4_exception exception = { };
2762         struct rpc_clnt *client = *clnt;
2763         int err;
2764         do {
2765                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2766                 switch (err) {
2767                 case -NFS4ERR_BADNAME:
2768                         err = -ENOENT;
2769                         goto out;
2770                 case -NFS4ERR_MOVED:
2771                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2772                         goto out;
2773                 case -NFS4ERR_WRONGSEC:
2774                         err = -EPERM;
2775                         if (client != *clnt)
2776                                 goto out;
2777
2778                         client = nfs4_create_sec_client(client, dir, name);
2779                         if (IS_ERR(client))
2780                                 return PTR_ERR(client);
2781
2782                         exception.retry = 1;
2783                         break;
2784                 default:
2785                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2786                 }
2787         } while (exception.retry);
2788
2789 out:
2790         if (err == 0)
2791                 *clnt = client;
2792         else if (client != *clnt)
2793                 rpc_shutdown_client(client);
2794
2795         return err;
2796 }
2797
2798 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2799                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2800 {
2801         int status;
2802         struct rpc_clnt *client = NFS_CLIENT(dir);
2803
2804         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2805         if (client != NFS_CLIENT(dir)) {
2806                 rpc_shutdown_client(client);
2807                 nfs_fixup_secinfo_attributes(fattr);
2808         }
2809         return status;
2810 }
2811
2812 struct rpc_clnt *
2813 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2814                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2815 {
2816         int status;
2817         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2818
2819         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2820         if (status < 0) {
2821                 rpc_shutdown_client(client);
2822                 return ERR_PTR(status);
2823         }
2824         return client;
2825 }
2826
2827 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2828 {
2829         struct nfs_server *server = NFS_SERVER(inode);
2830         struct nfs4_accessargs args = {
2831                 .fh = NFS_FH(inode),
2832                 .bitmask = server->cache_consistency_bitmask,
2833         };
2834         struct nfs4_accessres res = {
2835                 .server = server,
2836         };
2837         struct rpc_message msg = {
2838                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2839                 .rpc_argp = &args,
2840                 .rpc_resp = &res,
2841                 .rpc_cred = entry->cred,
2842         };
2843         int mode = entry->mask;
2844         int status;
2845
2846         /*
2847          * Determine which access bits we want to ask for...
2848          */
2849         if (mode & MAY_READ)
2850                 args.access |= NFS4_ACCESS_READ;
2851         if (S_ISDIR(inode->i_mode)) {
2852                 if (mode & MAY_WRITE)
2853                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2854                 if (mode & MAY_EXEC)
2855                         args.access |= NFS4_ACCESS_LOOKUP;
2856         } else {
2857                 if (mode & MAY_WRITE)
2858                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2859                 if (mode & MAY_EXEC)
2860                         args.access |= NFS4_ACCESS_EXECUTE;
2861         }
2862
2863         res.fattr = nfs_alloc_fattr();
2864         if (res.fattr == NULL)
2865                 return -ENOMEM;
2866
2867         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2868         if (!status) {
2869                 nfs_access_set_mask(entry, res.access);
2870                 nfs_refresh_inode(inode, res.fattr);
2871         }
2872         nfs_free_fattr(res.fattr);
2873         return status;
2874 }
2875
2876 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2877 {
2878         struct nfs4_exception exception = { };
2879         int err;
2880         do {
2881                 err = nfs4_handle_exception(NFS_SERVER(inode),
2882                                 _nfs4_proc_access(inode, entry),
2883                                 &exception);
2884         } while (exception.retry);
2885         return err;
2886 }
2887
2888 /*
2889  * TODO: For the time being, we don't try to get any attributes
2890  * along with any of the zero-copy operations READ, READDIR,
2891  * READLINK, WRITE.
2892  *
2893  * In the case of the first three, we want to put the GETATTR
2894  * after the read-type operation -- this is because it is hard
2895  * to predict the length of a GETATTR response in v4, and thus
2896  * align the READ data correctly.  This means that the GETATTR
2897  * may end up partially falling into the page cache, and we should
2898  * shift it into the 'tail' of the xdr_buf before processing.
2899  * To do this efficiently, we need to know the total length
2900  * of data received, which doesn't seem to be available outside
2901  * of the RPC layer.
2902  *
2903  * In the case of WRITE, we also want to put the GETATTR after
2904  * the operation -- in this case because we want to make sure
2905  * we get the post-operation mtime and size.
2906  *
2907  * Both of these changes to the XDR layer would in fact be quite
2908  * minor, but I decided to leave them for a subsequent patch.
2909  */
2910 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2911                 unsigned int pgbase, unsigned int pglen)
2912 {
2913         struct nfs4_readlink args = {
2914                 .fh       = NFS_FH(inode),
2915                 .pgbase   = pgbase,
2916                 .pglen    = pglen,
2917                 .pages    = &page,
2918         };
2919         struct nfs4_readlink_res res;
2920         struct rpc_message msg = {
2921                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2922                 .rpc_argp = &args,
2923                 .rpc_resp = &res,
2924         };
2925
2926         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2927 }
2928
2929 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2930                 unsigned int pgbase, unsigned int pglen)
2931 {
2932         struct nfs4_exception exception = { };
2933         int err;
2934         do {
2935                 err = nfs4_handle_exception(NFS_SERVER(inode),
2936                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2937                                 &exception);
2938         } while (exception.retry);
2939         return err;
2940 }
2941
2942 /*
2943  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2944  */
2945 static int
2946 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2947                  int flags)
2948 {
2949         struct nfs_open_context *ctx;
2950         struct nfs4_state *state;
2951         int status = 0;
2952
2953         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2954         if (IS_ERR(ctx))
2955                 return PTR_ERR(ctx);
2956
2957         sattr->ia_mode &= ~current_umask();
2958         state = nfs4_do_open(dir, dentry, ctx->mode,
2959                         flags, sattr, ctx->cred,
2960                         &ctx->mdsthreshold);
2961         d_drop(dentry);
2962         if (IS_ERR(state)) {
2963                 status = PTR_ERR(state);
2964                 goto out;
2965         }
2966         d_add(dentry, igrab(state->inode));
2967         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2968         ctx->state = state;
2969 out:
2970         put_nfs_open_context(ctx);
2971         return status;
2972 }
2973
2974 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2975 {
2976         struct nfs_server *server = NFS_SERVER(dir);
2977         struct nfs_removeargs args = {
2978                 .fh = NFS_FH(dir),
2979                 .name = *name,
2980         };
2981         struct nfs_removeres res = {
2982                 .server = server,
2983         };
2984         struct rpc_message msg = {
2985                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2986                 .rpc_argp = &args,
2987                 .rpc_resp = &res,
2988         };
2989         int status;
2990
2991         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2992         if (status == 0)
2993                 update_changeattr(dir, &res.cinfo);
2994         return status;
2995 }
2996
2997 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2998 {
2999         struct nfs4_exception exception = { };
3000         int err;
3001         do {
3002                 err = nfs4_handle_exception(NFS_SERVER(dir),
3003                                 _nfs4_proc_remove(dir, name),
3004                                 &exception);
3005         } while (exception.retry);
3006         return err;
3007 }
3008
3009 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3010 {
3011         struct nfs_server *server = NFS_SERVER(dir);
3012         struct nfs_removeargs *args = msg->rpc_argp;
3013         struct nfs_removeres *res = msg->rpc_resp;
3014
3015         res->server = server;
3016         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3017         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3018 }
3019
3020 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3021 {
3022         nfs4_setup_sequence(NFS_SERVER(data->dir),
3023                         &data->args.seq_args,
3024                         &data->res.seq_res,
3025                         task);
3026 }
3027
3028 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3029 {
3030         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3031
3032         if (!nfs4_sequence_done(task, &res->seq_res))
3033                 return 0;
3034         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3035                 return 0;
3036         update_changeattr(dir, &res->cinfo);
3037         return 1;
3038 }
3039
3040 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3041 {
3042         struct nfs_server *server = NFS_SERVER(dir);
3043         struct nfs_renameargs *arg = msg->rpc_argp;
3044         struct nfs_renameres *res = msg->rpc_resp;
3045
3046         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3047         res->server = server;
3048         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3049 }
3050
3051 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3052 {
3053         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3054                         &data->args.seq_args,
3055                         &data->res.seq_res,
3056                         task);
3057 }
3058
3059 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3060                                  struct inode *new_dir)
3061 {
3062         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3063
3064         if (!nfs4_sequence_done(task, &res->seq_res))
3065                 return 0;
3066         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3067                 return 0;
3068
3069         update_changeattr(old_dir, &res->old_cinfo);
3070         update_changeattr(new_dir, &res->new_cinfo);
3071         return 1;
3072 }
3073
3074 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3075                 struct inode *new_dir, struct qstr *new_name)
3076 {
3077         struct nfs_server *server = NFS_SERVER(old_dir);
3078         struct nfs_renameargs arg = {
3079                 .old_dir = NFS_FH(old_dir),
3080                 .new_dir = NFS_FH(new_dir),
3081                 .old_name = old_name,
3082                 .new_name = new_name,
3083         };
3084         struct nfs_renameres res = {
3085                 .server = server,
3086         };
3087         struct rpc_message msg = {
3088                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3089                 .rpc_argp = &arg,
3090                 .rpc_resp = &res,
3091         };
3092         int status = -ENOMEM;
3093
3094         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3095         if (!status) {
3096                 update_changeattr(old_dir, &res.old_cinfo);
3097                 update_changeattr(new_dir, &res.new_cinfo);
3098         }
3099         return status;
3100 }
3101
3102 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3103                 struct inode *new_dir, struct qstr *new_name)
3104 {
3105         struct nfs4_exception exception = { };
3106         int err;
3107         do {
3108                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3109                                 _nfs4_proc_rename(old_dir, old_name,
3110                                         new_dir, new_name),
3111                                 &exception);
3112         } while (exception.retry);
3113         return err;
3114 }
3115
3116 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3117 {
3118         struct nfs_server *server = NFS_SERVER(inode);
3119         struct nfs4_link_arg arg = {
3120                 .fh     = NFS_FH(inode),
3121                 .dir_fh = NFS_FH(dir),
3122                 .name   = name,
3123                 .bitmask = server->attr_bitmask,
3124         };
3125         struct nfs4_link_res res = {
3126                 .server = server,
3127         };
3128         struct rpc_message msg = {
3129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3130                 .rpc_argp = &arg,
3131                 .rpc_resp = &res,
3132         };
3133         int status = -ENOMEM;
3134
3135         res.fattr = nfs_alloc_fattr();
3136         if (res.fattr == NULL)
3137                 goto out;
3138
3139         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3140         if (!status) {
3141                 update_changeattr(dir, &res.cinfo);
3142                 nfs_post_op_update_inode(inode, res.fattr);
3143         }
3144 out:
3145         nfs_free_fattr(res.fattr);
3146         return status;
3147 }
3148
3149 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3150 {
3151         struct nfs4_exception exception = { };
3152         int err;
3153         do {
3154                 err = nfs4_handle_exception(NFS_SERVER(inode),
3155                                 _nfs4_proc_link(inode, dir, name),
3156                                 &exception);
3157         } while (exception.retry);
3158         return err;
3159 }
3160
3161 struct nfs4_createdata {
3162         struct rpc_message msg;
3163         struct nfs4_create_arg arg;
3164         struct nfs4_create_res res;
3165         struct nfs_fh fh;
3166         struct nfs_fattr fattr;
3167 };
3168
3169 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3170                 struct qstr *name, struct iattr *sattr, u32 ftype)
3171 {
3172         struct nfs4_createdata *data;
3173
3174         data = kzalloc(sizeof(*data), GFP_KERNEL);
3175         if (data != NULL) {
3176                 struct nfs_server *server = NFS_SERVER(dir);
3177
3178                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3179                 data->msg.rpc_argp = &data->arg;
3180                 data->msg.rpc_resp = &data->res;
3181                 data->arg.dir_fh = NFS_FH(dir);
3182                 data->arg.server = server;
3183                 data->arg.name = name;
3184                 data->arg.attrs = sattr;
3185                 data->arg.ftype = ftype;
3186                 data->arg.bitmask = server->attr_bitmask;
3187                 data->res.server = server;
3188                 data->res.fh = &data->fh;
3189                 data->res.fattr = &data->fattr;
3190                 nfs_fattr_init(data->res.fattr);
3191         }
3192         return data;
3193 }
3194
3195 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3196 {
3197         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3198                                     &data->arg.seq_args, &data->res.seq_res, 1);
3199         if (status == 0) {
3200                 update_changeattr(dir, &data->res.dir_cinfo);
3201                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3202         }
3203         return status;
3204 }
3205
3206 static void nfs4_free_createdata(struct nfs4_createdata *data)
3207 {
3208         kfree(data);
3209 }
3210
3211 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3212                 struct page *page, unsigned int len, struct iattr *sattr)
3213 {
3214         struct nfs4_createdata *data;
3215         int status = -ENAMETOOLONG;
3216
3217         if (len > NFS4_MAXPATHLEN)
3218                 goto out;
3219
3220         status = -ENOMEM;
3221         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3222         if (data == NULL)
3223                 goto out;
3224
3225         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3226         data->arg.u.symlink.pages = &page;
3227         data->arg.u.symlink.len = len;
3228
3229         status = nfs4_do_create(dir, dentry, data);
3230
3231         nfs4_free_createdata(data);
3232 out:
3233         return status;
3234 }
3235
3236 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3237                 struct page *page, unsigned int len, struct iattr *sattr)
3238 {
3239         struct nfs4_exception exception = { };
3240         int err;
3241         do {
3242                 err = nfs4_handle_exception(NFS_SERVER(dir),
3243                                 _nfs4_proc_symlink(dir, dentry, page,
3244                                                         len, sattr),
3245                                 &exception);
3246         } while (exception.retry);
3247         return err;
3248 }
3249
3250 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3251                 struct iattr *sattr)
3252 {
3253         struct nfs4_createdata *data;
3254         int status = -ENOMEM;
3255
3256         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3257         if (data == NULL)
3258                 goto out;
3259
3260         status = nfs4_do_create(dir, dentry, data);
3261
3262         nfs4_free_createdata(data);
3263 out:
3264         return status;
3265 }
3266
3267 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3268                 struct iattr *sattr)
3269 {
3270         struct nfs4_exception exception = { };
3271         int err;
3272
3273         sattr->ia_mode &= ~current_umask();
3274         do {
3275                 err = nfs4_handle_exception(NFS_SERVER(dir),
3276                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3277                                 &exception);
3278         } while (exception.retry);
3279         return err;
3280 }
3281
3282 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3283                 u64 cookie, struct page **pages, unsigned int count, int plus)
3284 {
3285         struct inode            *dir = dentry->d_inode;
3286         struct nfs4_readdir_arg args = {
3287                 .fh = NFS_FH(dir),
3288                 .pages = pages,
3289                 .pgbase = 0,
3290                 .count = count,
3291                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3292                 .plus = plus,
3293         };
3294         struct nfs4_readdir_res res;
3295         struct rpc_message msg = {
3296                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3297                 .rpc_argp = &args,
3298                 .rpc_resp = &res,
3299                 .rpc_cred = cred,
3300         };
3301         int                     status;
3302
3303         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3304                         dentry->d_parent->d_name.name,
3305                         dentry->d_name.name,
3306                         (unsigned long long)cookie);
3307         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3308         res.pgbase = args.pgbase;
3309         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3310         if (status >= 0) {
3311                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3312                 status += args.pgbase;
3313         }
3314
3315         nfs_invalidate_atime(dir);
3316
3317         dprintk("%s: returns %d\n", __func__, status);
3318         return status;
3319 }
3320
3321 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3322                 u64 cookie, struct page **pages, unsigned int count, int plus)
3323 {
3324         struct nfs4_exception exception = { };
3325         int err;
3326         do {
3327                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3328                                 _nfs4_proc_readdir(dentry, cred, cookie,
3329                                         pages, count, plus),
3330                                 &exception);
3331         } while (exception.retry);
3332         return err;
3333 }
3334
3335 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3336                 struct iattr *sattr, dev_t rdev)
3337 {
3338         struct nfs4_createdata *data;
3339         int mode = sattr->ia_mode;
3340         int status = -ENOMEM;
3341
3342         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3343         if (data == NULL)
3344                 goto out;
3345
3346         if (S_ISFIFO(mode))
3347                 data->arg.ftype = NF4FIFO;
3348         else if (S_ISBLK(mode)) {
3349                 data->arg.ftype = NF4BLK;
3350                 data->arg.u.device.specdata1 = MAJOR(rdev);
3351                 data->arg.u.device.specdata2 = MINOR(rdev);
3352         }
3353         else if (S_ISCHR(mode)) {
3354                 data->arg.ftype = NF4CHR;
3355                 data->arg.u.device.specdata1 = MAJOR(rdev);
3356                 data->arg.u.device.specdata2 = MINOR(rdev);
3357         } else if (!S_ISSOCK(mode)) {
3358                 status = -EINVAL;
3359                 goto out_free;
3360         }
3361
3362         status = nfs4_do_create(dir, dentry, data);
3363 out_free:
3364         nfs4_free_createdata(data);
3365 out:
3366         return status;
3367 }
3368
3369 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3370                 struct iattr *sattr, dev_t rdev)
3371 {
3372         struct nfs4_exception exception = { };
3373         int err;
3374
3375         sattr->ia_mode &= ~current_umask();
3376         do {
3377                 err = nfs4_handle_exception(NFS_SERVER(dir),
3378                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3379                                 &exception);
3380         } while (exception.retry);
3381         return err;
3382 }
3383
3384 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3385                  struct nfs_fsstat *fsstat)
3386 {
3387         struct nfs4_statfs_arg args = {
3388                 .fh = fhandle,
3389                 .bitmask = server->attr_bitmask,
3390         };
3391         struct nfs4_statfs_res res = {
3392                 .fsstat = fsstat,
3393         };
3394         struct rpc_message msg = {
3395                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3396                 .rpc_argp = &args,
3397                 .rpc_resp = &res,
3398         };
3399
3400         nfs_fattr_init(fsstat->fattr);
3401         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3402 }
3403
3404 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3405 {
3406         struct nfs4_exception exception = { };
3407         int err;
3408         do {
3409                 err = nfs4_handle_exception(server,
3410                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3411                                 &exception);
3412         } while (exception.retry);
3413         return err;
3414 }
3415
3416 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3417                 struct nfs_fsinfo *fsinfo)
3418 {
3419         struct nfs4_fsinfo_arg args = {
3420                 .fh = fhandle,
3421                 .bitmask = server->attr_bitmask,
3422         };
3423         struct nfs4_fsinfo_res res = {
3424                 .fsinfo = fsinfo,
3425         };
3426         struct rpc_message msg = {
3427                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3428                 .rpc_argp = &args,
3429                 .rpc_resp = &res,
3430         };
3431
3432         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3433 }
3434
3435 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3436 {
3437         struct nfs4_exception exception = { };
3438         int err;
3439
3440         do {
3441                 err = nfs4_handle_exception(server,
3442                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3443                                 &exception);
3444         } while (exception.retry);
3445         return err;
3446 }
3447
3448 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3449 {
3450         int error;
3451
3452         nfs_fattr_init(fsinfo->fattr);
3453         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3454         if (error == 0) {
3455                 /* block layout checks this! */
3456                 server->pnfs_blksize = fsinfo->blksize;
3457                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3458         }
3459
3460         return error;
3461 }
3462
3463 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3464                 struct nfs_pathconf *pathconf)
3465 {
3466         struct nfs4_pathconf_arg args = {
3467                 .fh = fhandle,
3468                 .bitmask = server->attr_bitmask,
3469         };
3470         struct nfs4_pathconf_res res = {
3471                 .pathconf = pathconf,
3472         };
3473         struct rpc_message msg = {
3474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3475                 .rpc_argp = &args,
3476                 .rpc_resp = &res,
3477         };
3478
3479         /* None of the pathconf attributes are mandatory to implement */
3480         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3481                 memset(pathconf, 0, sizeof(*pathconf));
3482                 return 0;
3483         }
3484
3485         nfs_fattr_init(pathconf->fattr);
3486         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3487 }
3488
3489 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3490                 struct nfs_pathconf *pathconf)
3491 {
3492         struct nfs4_exception exception = { };
3493         int err;
3494
3495         do {
3496                 err = nfs4_handle_exception(server,
3497                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3498                                 &exception);
3499         } while (exception.retry);
3500         return err;
3501 }
3502
3503 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3504                 const struct nfs_open_context *ctx,
3505                 const struct nfs_lock_context *l_ctx,
3506                 fmode_t fmode)
3507 {
3508         const struct nfs_lockowner *lockowner = NULL;
3509
3510         if (l_ctx != NULL)
3511                 lockowner = &l_ctx->lockowner;
3512         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3513 }
3514 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3515
3516 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3517                 const struct nfs_open_context *ctx,
3518                 const struct nfs_lock_context *l_ctx,
3519                 fmode_t fmode)
3520 {
3521         nfs4_stateid current_stateid;
3522
3523         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3524                 return false;
3525         return nfs4_stateid_match(stateid, &current_stateid);
3526 }
3527
3528 static bool nfs4_error_stateid_expired(int err)
3529 {
3530         switch (err) {
3531         case -NFS4ERR_DELEG_REVOKED:
3532         case -NFS4ERR_ADMIN_REVOKED:
3533         case -NFS4ERR_BAD_STATEID:
3534         case -NFS4ERR_STALE_STATEID:
3535         case -NFS4ERR_OLD_STATEID:
3536         case -NFS4ERR_OPENMODE:
3537         case -NFS4ERR_EXPIRED:
3538                 return true;
3539         }
3540         return false;
3541 }
3542
3543 void __nfs4_read_done_cb(struct nfs_read_data *data)
3544 {
3545         nfs_invalidate_atime(data->header->inode);
3546 }
3547
3548 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3549 {
3550         struct nfs_server *server = NFS_SERVER(data->header->inode);
3551
3552         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3553                 rpc_restart_call_prepare(task);
3554                 return -EAGAIN;
3555         }
3556
3557         __nfs4_read_done_cb(data);
3558         if (task->tk_status > 0)
3559                 renew_lease(server, data->timestamp);
3560         return 0;
3561 }
3562
3563 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3564                 struct nfs_readargs *args)
3565 {
3566
3567         if (!nfs4_error_stateid_expired(task->tk_status) ||
3568                 nfs4_stateid_is_current(&args->stateid,
3569                                 args->context,
3570                                 args->lock_context,
3571                                 FMODE_READ))
3572                 return false;
3573         rpc_restart_call_prepare(task);
3574         return true;
3575 }
3576
3577 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3578 {
3579
3580         dprintk("--> %s\n", __func__);
3581
3582         if (!nfs4_sequence_done(task, &data->res.seq_res))
3583                 return -EAGAIN;
3584         if (nfs4_read_stateid_changed(task, &data->args))
3585                 return -EAGAIN;
3586         return data->read_done_cb ? data->read_done_cb(task, data) :
3587                                     nfs4_read_done_cb(task, data);
3588 }
3589
3590 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3591 {
3592         data->timestamp   = jiffies;
3593         data->read_done_cb = nfs4_read_done_cb;
3594         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3595         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3596 }
3597
3598 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3599 {
3600         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3601                         &data->args.seq_args,
3602                         &data->res.seq_res,
3603                         task))
3604                 return;
3605         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3606                         data->args.lock_context, FMODE_READ);
3607 }
3608
3609 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3610 {
3611         struct inode *inode = data->header->inode;
3612
3613         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3614                 rpc_restart_call_prepare(task);
3615                 return -EAGAIN;
3616         }
3617         if (task->tk_status >= 0) {
3618                 renew_lease(NFS_SERVER(inode), data->timestamp);
3619                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3620         }
3621         return 0;
3622 }
3623
3624 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3625                 struct nfs_writeargs *args)
3626 {
3627
3628         if (!nfs4_error_stateid_expired(task->tk_status) ||
3629                 nfs4_stateid_is_current(&args->stateid,
3630                                 args->context,
3631                                 args->lock_context,
3632                                 FMODE_WRITE))
3633                 return false;
3634         rpc_restart_call_prepare(task);
3635         return true;
3636 }
3637
3638 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3639 {
3640         if (!nfs4_sequence_done(task, &data->res.seq_res))
3641                 return -EAGAIN;
3642         if (nfs4_write_stateid_changed(task, &data->args))
3643                 return -EAGAIN;
3644         return data->write_done_cb ? data->write_done_cb(task, data) :
3645                 nfs4_write_done_cb(task, data);
3646 }
3647
3648 static
3649 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3650 {
3651         const struct nfs_pgio_header *hdr = data->header;
3652
3653         /* Don't request attributes for pNFS or O_DIRECT writes */
3654         if (data->ds_clp != NULL || hdr->dreq != NULL)
3655                 return false;
3656         /* Otherwise, request attributes if and only if we don't hold
3657          * a delegation
3658          */
3659         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3660 }
3661
3662 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3663 {
3664         struct nfs_server *server = NFS_SERVER(data->header->inode);
3665
3666         if (!nfs4_write_need_cache_consistency_data(data)) {
3667                 data->args.bitmask = NULL;
3668                 data->res.fattr = NULL;
3669         } else
3670                 data->args.bitmask = server->cache_consistency_bitmask;
3671
3672         if (!data->write_done_cb)
3673                 data->write_done_cb = nfs4_write_done_cb;
3674         data->res.server = server;
3675         data->timestamp   = jiffies;
3676
3677         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3678         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3679 }
3680
3681 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3682 {
3683         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3684                         &data->args.seq_args,
3685                         &data->res.seq_res,
3686                         task))
3687                 return;
3688         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3689                         data->args.lock_context, FMODE_WRITE);
3690 }
3691
3692 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3693 {
3694         nfs4_setup_sequence(NFS_SERVER(data->inode),
3695                         &data->args.seq_args,
3696                         &data->res.seq_res,
3697                         task);
3698 }
3699
3700 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3701 {
3702         struct inode *inode = data->inode;
3703
3704         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3705                 rpc_restart_call_prepare(task);
3706                 return -EAGAIN;
3707         }
3708         return 0;
3709 }
3710
3711 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3712 {
3713         if (!nfs4_sequence_done(task, &data->res.seq_res))
3714                 return -EAGAIN;
3715         return data->commit_done_cb(task, data);
3716 }
3717
3718 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3719 {
3720         struct nfs_server *server = NFS_SERVER(data->inode);
3721
3722         if (data->commit_done_cb == NULL)
3723                 data->commit_done_cb = nfs4_commit_done_cb;
3724         data->res.server = server;
3725         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3726         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3727 }
3728
3729 struct nfs4_renewdata {
3730         struct nfs_client       *client;
3731         unsigned long           timestamp;
3732 };
3733
3734 /*
3735  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3736  * standalone procedure for queueing an asynchronous RENEW.
3737  */
3738 static void nfs4_renew_release(void *calldata)
3739 {
3740         struct nfs4_renewdata *data = calldata;
3741         struct nfs_client *clp = data->client;
3742
3743         if (atomic_read(&clp->cl_count) > 1)
3744                 nfs4_schedule_state_renewal(clp);
3745         nfs_put_client(clp);
3746         kfree(data);
3747 }
3748
3749 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3750 {
3751         struct nfs4_renewdata *data = calldata;
3752         struct nfs_client *clp = data->client;
3753         unsigned long timestamp = data->timestamp;
3754
3755         if (task->tk_status < 0) {
3756                 /* Unless we're shutting down, schedule state recovery! */
3757                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3758                         return;
3759                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3760                         nfs4_schedule_lease_recovery(clp);
3761                         return;
3762                 }
3763                 nfs4_schedule_path_down_recovery(clp);
3764         }
3765         do_renew_lease(clp, timestamp);
3766 }
3767
3768 static const struct rpc_call_ops nfs4_renew_ops = {
3769         .rpc_call_done = nfs4_renew_done,
3770         .rpc_release = nfs4_renew_release,
3771 };
3772
3773 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3774 {
3775         struct rpc_message msg = {
3776                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3777                 .rpc_argp       = clp,
3778                 .rpc_cred       = cred,
3779         };
3780         struct nfs4_renewdata *data;
3781
3782         if (renew_flags == 0)
3783                 return 0;
3784         if (!atomic_inc_not_zero(&clp->cl_count))
3785                 return -EIO;
3786         data = kmalloc(sizeof(*data), GFP_NOFS);
3787         if (data == NULL)
3788                 return -ENOMEM;
3789         data->client = clp;
3790         data->timestamp = jiffies;
3791         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3792                         &nfs4_renew_ops, data);
3793 }
3794
3795 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3796 {
3797         struct rpc_message msg = {
3798                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3799                 .rpc_argp       = clp,
3800                 .rpc_cred       = cred,
3801         };
3802         unsigned long now = jiffies;
3803         int status;
3804
3805         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3806         if (status < 0)
3807                 return status;
3808         do_renew_lease(clp, now);
3809         return 0;
3810 }
3811
3812 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3813 {
3814         return (server->caps & NFS_CAP_ACLS)
3815                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3816                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3817 }
3818
3819 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3820  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3821  * the stack.
3822  */
3823 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3824
3825 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3826                 struct page **pages, unsigned int *pgbase)
3827 {
3828         struct page *newpage, **spages;
3829         int rc = 0;
3830         size_t len;
3831         spages = pages;
3832
3833         do {
3834                 len = min_t(size_t, PAGE_SIZE, buflen);
3835                 newpage = alloc_page(GFP_KERNEL);
3836
3837                 if (newpage == NULL)
3838                         goto unwind;
3839                 memcpy(page_address(newpage), buf, len);
3840                 buf += len;
3841                 buflen -= len;
3842                 *pages++ = newpage;
3843                 rc++;
3844         } while (buflen != 0);
3845
3846         return rc;
3847
3848 unwind:
3849         for(; rc > 0; rc--)
3850                 __free_page(spages[rc-1]);
3851         return -ENOMEM;
3852 }
3853
3854 struct nfs4_cached_acl {
3855         int cached;
3856         size_t len;
3857         char data[0];
3858 };
3859
3860 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3861 {
3862         struct nfs_inode *nfsi = NFS_I(inode);
3863
3864         spin_lock(&inode->i_lock);
3865         kfree(nfsi->nfs4_acl);
3866         nfsi->nfs4_acl = acl;
3867         spin_unlock(&inode->i_lock);
3868 }
3869
3870 static void nfs4_zap_acl_attr(struct inode *inode)
3871 {
3872         nfs4_set_cached_acl(inode, NULL);
3873 }
3874
3875 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3876 {
3877         struct nfs_inode *nfsi = NFS_I(inode);
3878         struct nfs4_cached_acl *acl;
3879         int ret = -ENOENT;
3880
3881         spin_lock(&inode->i_lock);
3882         acl = nfsi->nfs4_acl;
3883         if (acl == NULL)
3884                 goto out;
3885         if (buf == NULL) /* user is just asking for length */
3886                 goto out_len;
3887         if (acl->cached == 0)
3888                 goto out;
3889         ret = -ERANGE; /* see getxattr(2) man page */
3890         if (acl->len > buflen)
3891                 goto out;
3892         memcpy(buf, acl->data, acl->len);
3893 out_len:
3894         ret = acl->len;
3895 out:
3896         spin_unlock(&inode->i_lock);
3897         return ret;
3898 }
3899
3900 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3901 {
3902         struct nfs4_cached_acl *acl;
3903         size_t buflen = sizeof(*acl) + acl_len;
3904
3905         if (buflen <= PAGE_SIZE) {
3906                 acl = kmalloc(buflen, GFP_KERNEL);
3907                 if (acl == NULL)
3908                         goto out;
3909                 acl->cached = 1;
3910                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3911         } else {
3912                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3913                 if (acl == NULL)
3914                         goto out;
3915                 acl->cached = 0;
3916         }
3917         acl->len = acl_len;
3918 out:
3919         nfs4_set_cached_acl(inode, acl);
3920 }
3921
3922 /*
3923  * The getxattr API returns the required buffer length when called with a
3924  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3925  * the required buf.  On a NULL buf, we send a page of data to the server
3926  * guessing that the ACL request can be serviced by a page. If so, we cache
3927  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3928  * the cache. If not so, we throw away the page, and cache the required
3929  * length. The next getxattr call will then produce another round trip to
3930  * the server, this time with the input buf of the required size.
3931  */
3932 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3933 {
3934         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3935         struct nfs_getaclargs args = {
3936                 .fh = NFS_FH(inode),
3937                 .acl_pages = pages,
3938                 .acl_len = buflen,
3939         };
3940         struct nfs_getaclres res = {
3941                 .acl_len = buflen,
3942         };
3943         struct rpc_message msg = {
3944                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3945                 .rpc_argp = &args,
3946                 .rpc_resp = &res,
3947         };
3948         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3949         int ret = -ENOMEM, i;
3950
3951         /* As long as we're doing a round trip to the server anyway,
3952          * let's be prepared for a page of acl data. */
3953         if (npages == 0)
3954                 npages = 1;
3955         if (npages > ARRAY_SIZE(pages))
3956                 return -ERANGE;
3957
3958         for (i = 0; i < npages; i++) {
3959                 pages[i] = alloc_page(GFP_KERNEL);
3960                 if (!pages[i])
3961                         goto out_free;
3962         }
3963
3964         /* for decoding across pages */
3965         res.acl_scratch = alloc_page(GFP_KERNEL);
3966         if (!res.acl_scratch)
3967                 goto out_free;
3968
3969         args.acl_len = npages * PAGE_SIZE;
3970         args.acl_pgbase = 0;
3971
3972         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3973                 __func__, buf, buflen, npages, args.acl_len);
3974         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3975                              &msg, &args.seq_args, &res.seq_res, 0);
3976         if (ret)
3977                 goto out_free;
3978
3979         /* Handle the case where the passed-in buffer is too short */
3980         if (res.acl_flags & NFS4_ACL_TRUNC) {
3981                 /* Did the user only issue a request for the acl length? */
3982                 if (buf == NULL)
3983                         goto out_ok;
3984                 ret = -ERANGE;
3985                 goto out_free;
3986         }
3987         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3988         if (buf) {
3989                 if (res.acl_len > buflen) {
3990                         ret = -ERANGE;
3991                         goto out_free;
3992                 }
3993                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3994         }
3995 out_ok:
3996         ret = res.acl_len;
3997 out_free:
3998         for (i = 0; i < npages; i++)
3999                 if (pages[i])
4000                         __free_page(pages[i]);
4001         if (res.acl_scratch)
4002                 __free_page(res.acl_scratch);
4003         return ret;
4004 }
4005
4006 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4007 {
4008         struct nfs4_exception exception = { };
4009         ssize_t ret;
4010         do {
4011                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4012                 if (ret >= 0)
4013                         break;
4014                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4015         } while (exception.retry);
4016         return ret;
4017 }
4018
4019 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4020 {
4021         struct nfs_server *server = NFS_SERVER(inode);
4022         int ret;
4023
4024         if (!nfs4_server_supports_acls(server))
4025                 return -EOPNOTSUPP;
4026         ret = nfs_revalidate_inode(server, inode);
4027         if (ret < 0)
4028                 return ret;
4029         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4030                 nfs_zap_acl_cache(inode);
4031         ret = nfs4_read_cached_acl(inode, buf, buflen);
4032         if (ret != -ENOENT)
4033                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4034                  * but no cached acl data, just the acl length */
4035                 return ret;
4036         return nfs4_get_acl_uncached(inode, buf, buflen);
4037 }
4038
4039 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4040 {
4041         struct nfs_server *server = NFS_SERVER(inode);
4042         struct page *pages[NFS4ACL_MAXPAGES];
4043         struct nfs_setaclargs arg = {
4044                 .fh             = NFS_FH(inode),
4045                 .acl_pages      = pages,
4046                 .acl_len        = buflen,
4047         };
4048         struct nfs_setaclres res;
4049         struct rpc_message msg = {
4050                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4051                 .rpc_argp       = &arg,
4052                 .rpc_resp       = &res,
4053         };
4054         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4055         int ret, i;
4056
4057         if (!nfs4_server_supports_acls(server))
4058                 return -EOPNOTSUPP;
4059         if (npages > ARRAY_SIZE(pages))
4060                 return -ERANGE;
4061         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4062         if (i < 0)
4063                 return i;
4064         nfs4_inode_return_delegation(inode);
4065         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4066
4067         /*
4068          * Free each page after tx, so the only ref left is
4069          * held by the network stack
4070          */
4071         for (; i > 0; i--)
4072                 put_page(pages[i-1]);
4073
4074         /*
4075          * Acl update can result in inode attribute update.
4076          * so mark the attribute cache invalid.
4077          */
4078         spin_lock(&inode->i_lock);
4079         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4080         spin_unlock(&inode->i_lock);
4081         nfs_access_zap_cache(inode);
4082         nfs_zap_acl_cache(inode);
4083         return ret;
4084 }
4085
4086 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4087 {
4088         struct nfs4_exception exception = { };
4089         int err;
4090         do {
4091                 err = nfs4_handle_exception(NFS_SERVER(inode),
4092                                 __nfs4_proc_set_acl(inode, buf, buflen),
4093                                 &exception);
4094         } while (exception.retry);
4095         return err;
4096 }
4097
4098 static int
4099 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4100 {
4101         struct nfs_client *clp = server->nfs_client;
4102
4103         if (task->tk_status >= 0)
4104                 return 0;
4105         switch(task->tk_status) {
4106                 case -NFS4ERR_DELEG_REVOKED:
4107                 case -NFS4ERR_ADMIN_REVOKED:
4108                 case -NFS4ERR_BAD_STATEID:
4109                         if (state == NULL)
4110                                 break;
4111                         nfs_remove_bad_delegation(state->inode);
4112                 case -NFS4ERR_OPENMODE:
4113                         if (state == NULL)
4114                                 break;
4115                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4116                                 goto stateid_invalid;
4117                         goto wait_on_recovery;
4118                 case -NFS4ERR_EXPIRED:
4119                         if (state != NULL) {
4120                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4121                                         goto stateid_invalid;
4122                         }
4123                 case -NFS4ERR_STALE_STATEID:
4124                 case -NFS4ERR_STALE_CLIENTID:
4125                         nfs4_schedule_lease_recovery(clp);
4126                         goto wait_on_recovery;
4127 #if defined(CONFIG_NFS_V4_1)
4128                 case -NFS4ERR_BADSESSION:
4129                 case -NFS4ERR_BADSLOT:
4130                 case -NFS4ERR_BAD_HIGH_SLOT:
4131                 case -NFS4ERR_DEADSESSION:
4132                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4133                 case -NFS4ERR_SEQ_FALSE_RETRY:
4134                 case -NFS4ERR_SEQ_MISORDERED:
4135                         dprintk("%s ERROR %d, Reset session\n", __func__,
4136                                 task->tk_status);
4137                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4138                         task->tk_status = 0;
4139                         return -EAGAIN;
4140 #endif /* CONFIG_NFS_V4_1 */
4141                 case -NFS4ERR_DELAY:
4142                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4143                 case -NFS4ERR_GRACE:
4144                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4145                         task->tk_status = 0;
4146                         return -EAGAIN;
4147                 case -NFS4ERR_RETRY_UNCACHED_REP:
4148                 case -NFS4ERR_OLD_STATEID:
4149                         task->tk_status = 0;
4150                         return -EAGAIN;
4151         }
4152         task->tk_status = nfs4_map_errors(task->tk_status);
4153         return 0;
4154 stateid_invalid:
4155         task->tk_status = -EIO;
4156         return 0;
4157 wait_on_recovery:
4158         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4159         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4160                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4161         task->tk_status = 0;
4162         return -EAGAIN;
4163 }
4164
4165 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4166                                     nfs4_verifier *bootverf)
4167 {
4168         __be32 verf[2];
4169
4170         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4171                 /* An impossible timestamp guarantees this value
4172                  * will never match a generated boot time. */
4173                 verf[0] = 0;
4174                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4175         } else {
4176                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4177                 verf[0] = (__be32)nn->boot_time.tv_sec;
4178                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4179         }
4180         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4181 }
4182
4183 static unsigned int
4184 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4185                                    char *buf, size_t len)
4186 {
4187         unsigned int result;
4188
4189         rcu_read_lock();
4190         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4191                                 clp->cl_ipaddr,
4192                                 rpc_peeraddr2str(clp->cl_rpcclient,
4193                                                         RPC_DISPLAY_ADDR),
4194                                 rpc_peeraddr2str(clp->cl_rpcclient,
4195                                                         RPC_DISPLAY_PROTO));
4196         rcu_read_unlock();
4197         return result;
4198 }
4199
4200 static unsigned int
4201 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4202                                 char *buf, size_t len)
4203 {
4204         char *nodename = clp->cl_rpcclient->cl_nodename;
4205
4206         if (nfs4_client_id_uniquifier[0] != '\0')
4207                 nodename = nfs4_client_id_uniquifier;
4208         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4209                                 clp->rpc_ops->version, clp->cl_minorversion,
4210                                 nodename);
4211 }
4212
4213 /**
4214  * nfs4_proc_setclientid - Negotiate client ID
4215  * @clp: state data structure
4216  * @program: RPC program for NFSv4 callback service
4217  * @port: IP port number for NFS4 callback service
4218  * @cred: RPC credential to use for this call
4219  * @res: where to place the result
4220  *
4221  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4222  */
4223 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4224                 unsigned short port, struct rpc_cred *cred,
4225                 struct nfs4_setclientid_res *res)
4226 {
4227         nfs4_verifier sc_verifier;
4228         struct nfs4_setclientid setclientid = {
4229                 .sc_verifier = &sc_verifier,
4230                 .sc_prog = program,
4231                 .sc_cb_ident = clp->cl_cb_ident,
4232         };
4233         struct rpc_message msg = {
4234                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4235                 .rpc_argp = &setclientid,
4236                 .rpc_resp = res,
4237                 .rpc_cred = cred,
4238         };
4239         int status;
4240
4241         /* nfs_client_id4 */
4242         nfs4_init_boot_verifier(clp, &sc_verifier);
4243         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4244                 setclientid.sc_name_len =
4245                                 nfs4_init_uniform_client_string(clp,
4246                                                 setclientid.sc_name,
4247                                                 sizeof(setclientid.sc_name));
4248         else
4249                 setclientid.sc_name_len =
4250                                 nfs4_init_nonuniform_client_string(clp,
4251                                                 setclientid.sc_name,
4252                                                 sizeof(setclientid.sc_name));
4253         /* cb_client4 */
4254         rcu_read_lock();
4255         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4256                                 sizeof(setclientid.sc_netid),
4257                                 rpc_peeraddr2str(clp->cl_rpcclient,
4258                                                         RPC_DISPLAY_NETID));
4259         rcu_read_unlock();
4260         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4261                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4262                                 clp->cl_ipaddr, port >> 8, port & 255);
4263
4264         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4265                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4266                 setclientid.sc_name_len, setclientid.sc_name);
4267         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4268         dprintk("NFS reply setclientid: %d\n", status);
4269         return status;
4270 }
4271
4272 /**
4273  * nfs4_proc_setclientid_confirm - Confirm client ID
4274  * @clp: state data structure
4275  * @res: result of a previous SETCLIENTID
4276  * @cred: RPC credential to use for this call
4277  *
4278  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4279  */
4280 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4281                 struct nfs4_setclientid_res *arg,
4282                 struct rpc_cred *cred)
4283 {
4284         struct nfs_fsinfo fsinfo;
4285         struct rpc_message msg = {
4286                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4287                 .rpc_argp = arg,
4288                 .rpc_resp = &fsinfo,
4289                 .rpc_cred = cred,
4290         };
4291         unsigned long now;
4292         int status;
4293
4294         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4295                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4296                 clp->cl_clientid);
4297         now = jiffies;
4298         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4299         if (status == 0) {
4300                 spin_lock(&clp->cl_lock);
4301                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4302                 clp->cl_last_renewal = now;
4303                 spin_unlock(&clp->cl_lock);
4304         }
4305         dprintk("NFS reply setclientid_confirm: %d\n", status);
4306         return status;
4307 }
4308
4309 struct nfs4_delegreturndata {
4310         struct nfs4_delegreturnargs args;
4311         struct nfs4_delegreturnres res;
4312         struct nfs_fh fh;
4313         nfs4_stateid stateid;
4314         unsigned long timestamp;
4315         struct nfs_fattr fattr;
4316         int rpc_status;
4317 };
4318
4319 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4320 {
4321         struct nfs4_delegreturndata *data = calldata;
4322
4323         if (!nfs4_sequence_done(task, &data->res.seq_res))
4324                 return;
4325
4326         switch (task->tk_status) {
4327         case -NFS4ERR_STALE_STATEID:
4328         case -NFS4ERR_EXPIRED:
4329         case 0:
4330                 renew_lease(data->res.server, data->timestamp);
4331                 break;
4332         default:
4333                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4334                                 -EAGAIN) {
4335                         rpc_restart_call_prepare(task);
4336                         return;
4337                 }
4338         }
4339         data->rpc_status = task->tk_status;
4340 }
4341
4342 static void nfs4_delegreturn_release(void *calldata)
4343 {
4344         kfree(calldata);
4345 }
4346
4347 #if defined(CONFIG_NFS_V4_1)
4348 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4349 {
4350         struct nfs4_delegreturndata *d_data;
4351
4352         d_data = (struct nfs4_delegreturndata *)data;
4353
4354         nfs4_setup_sequence(d_data->res.server,
4355                         &d_data->args.seq_args,
4356                         &d_data->res.seq_res,
4357                         task);
4358 }
4359 #endif /* CONFIG_NFS_V4_1 */
4360
4361 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4362 #if defined(CONFIG_NFS_V4_1)
4363         .rpc_call_prepare = nfs4_delegreturn_prepare,
4364 #endif /* CONFIG_NFS_V4_1 */
4365         .rpc_call_done = nfs4_delegreturn_done,
4366         .rpc_release = nfs4_delegreturn_release,
4367 };
4368
4369 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4370 {
4371         struct nfs4_delegreturndata *data;
4372         struct nfs_server *server = NFS_SERVER(inode);
4373         struct rpc_task *task;
4374         struct rpc_message msg = {
4375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4376                 .rpc_cred = cred,
4377         };
4378         struct rpc_task_setup task_setup_data = {
4379                 .rpc_client = server->client,
4380                 .rpc_message = &msg,
4381                 .callback_ops = &nfs4_delegreturn_ops,
4382                 .flags = RPC_TASK_ASYNC,
4383         };
4384         int status = 0;
4385
4386         data = kzalloc(sizeof(*data), GFP_NOFS);
4387         if (data == NULL)
4388                 return -ENOMEM;
4389         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4390         data->args.fhandle = &data->fh;
4391         data->args.stateid = &data->stateid;
4392         data->args.bitmask = server->cache_consistency_bitmask;
4393         nfs_copy_fh(&data->fh, NFS_FH(inode));
4394         nfs4_stateid_copy(&data->stateid, stateid);
4395         data->res.fattr = &data->fattr;
4396         data->res.server = server;
4397         nfs_fattr_init(data->res.fattr);
4398         data->timestamp = jiffies;
4399         data->rpc_status = 0;
4400
4401         task_setup_data.callback_data = data;
4402         msg.rpc_argp = &data->args;
4403         msg.rpc_resp = &data->res;
4404         task = rpc_run_task(&task_setup_data);
4405         if (IS_ERR(task))
4406                 return PTR_ERR(task);
4407         if (!issync)
4408                 goto out;
4409         status = nfs4_wait_for_completion_rpc_task(task);
4410         if (status != 0)
4411                 goto out;
4412         status = data->rpc_status;
4413         if (status == 0)
4414                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4415         else
4416                 nfs_refresh_inode(inode, &data->fattr);
4417 out:
4418         rpc_put_task(task);
4419         return status;
4420 }
4421
4422 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4423 {
4424         struct nfs_server *server = NFS_SERVER(inode);
4425         struct nfs4_exception exception = { };
4426         int err;
4427         do {
4428                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4429                 switch (err) {
4430                         case -NFS4ERR_STALE_STATEID:
4431                         case -NFS4ERR_EXPIRED:
4432                         case 0:
4433                                 return 0;
4434                 }
4435                 err = nfs4_handle_exception(server, err, &exception);
4436         } while (exception.retry);
4437         return err;
4438 }
4439
4440 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4441 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4442
4443 /*
4444  * sleep, with exponential backoff, and retry the LOCK operation.
4445  */
4446 static unsigned long
4447 nfs4_set_lock_task_retry(unsigned long timeout)
4448 {
4449         freezable_schedule_timeout_killable(timeout);
4450         timeout <<= 1;
4451         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4452                 return NFS4_LOCK_MAXTIMEOUT;
4453         return timeout;
4454 }
4455
4456 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4457 {
4458         struct inode *inode = state->inode;
4459         struct nfs_server *server = NFS_SERVER(inode);
4460         struct nfs_client *clp = server->nfs_client;
4461         struct nfs_lockt_args arg = {
4462                 .fh = NFS_FH(inode),
4463                 .fl = request,
4464         };
4465         struct nfs_lockt_res res = {
4466                 .denied = request,
4467         };
4468         struct rpc_message msg = {
4469                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4470                 .rpc_argp       = &arg,
4471                 .rpc_resp       = &res,
4472                 .rpc_cred       = state->owner->so_cred,
4473         };
4474         struct nfs4_lock_state *lsp;
4475         int status;
4476
4477         arg.lock_owner.clientid = clp->cl_clientid;
4478         status = nfs4_set_lock_state(state, request);
4479         if (status != 0)
4480                 goto out;
4481         lsp = request->fl_u.nfs4_fl.owner;
4482         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4483         arg.lock_owner.s_dev = server->s_dev;
4484         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4485         switch (status) {
4486                 case 0:
4487                         request->fl_type = F_UNLCK;
4488                         break;
4489                 case -NFS4ERR_DENIED:
4490                         status = 0;
4491         }
4492         request->fl_ops->fl_release_private(request);
4493 out:
4494         return status;
4495 }
4496
4497 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4498 {
4499         struct nfs4_exception exception = { };
4500         int err;
4501
4502         do {
4503                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4504                                 _nfs4_proc_getlk(state, cmd, request),
4505                                 &exception);
4506         } while (exception.retry);
4507         return err;
4508 }
4509
4510 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4511 {
4512         int res = 0;
4513         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4514                 case FL_POSIX:
4515                         res = posix_lock_file_wait(file, fl);
4516                         break;
4517                 case FL_FLOCK:
4518                         res = flock_lock_file_wait(file, fl);
4519                         break;
4520                 default:
4521                         BUG();
4522         }
4523         return res;
4524 }
4525
4526 struct nfs4_unlockdata {
4527         struct nfs_locku_args arg;
4528         struct nfs_locku_res res;
4529         struct nfs4_lock_state *lsp;
4530         struct nfs_open_context *ctx;
4531         struct file_lock fl;
4532         const struct nfs_server *server;
4533         unsigned long timestamp;
4534 };
4535
4536 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4537                 struct nfs_open_context *ctx,
4538                 struct nfs4_lock_state *lsp,
4539                 struct nfs_seqid *seqid)
4540 {
4541         struct nfs4_unlockdata *p;
4542         struct inode *inode = lsp->ls_state->inode;
4543
4544         p = kzalloc(sizeof(*p), GFP_NOFS);
4545         if (p == NULL)
4546                 return NULL;
4547         p->arg.fh = NFS_FH(inode);
4548         p->arg.fl = &p->fl;
4549         p->arg.seqid = seqid;
4550         p->res.seqid = seqid;
4551         p->arg.stateid = &lsp->ls_stateid;
4552         p->lsp = lsp;
4553         atomic_inc(&lsp->ls_count);
4554         /* Ensure we don't close file until we're done freeing locks! */
4555         p->ctx = get_nfs_open_context(ctx);
4556         memcpy(&p->fl, fl, sizeof(p->fl));
4557         p->server = NFS_SERVER(inode);
4558         return p;
4559 }
4560
4561 static void nfs4_locku_release_calldata(void *data)
4562 {
4563         struct nfs4_unlockdata *calldata = data;
4564         nfs_free_seqid(calldata->arg.seqid);
4565         nfs4_put_lock_state(calldata->lsp);
4566         put_nfs_open_context(calldata->ctx);
4567         kfree(calldata);
4568 }
4569
4570 static void nfs4_locku_done(struct rpc_task *task, void *data)
4571 {
4572         struct nfs4_unlockdata *calldata = data;
4573
4574         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4575                 return;
4576         switch (task->tk_status) {
4577                 case 0:
4578                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4579                                         &calldata->res.stateid);
4580                         renew_lease(calldata->server, calldata->timestamp);
4581                         break;
4582                 case -NFS4ERR_BAD_STATEID:
4583                 case -NFS4ERR_OLD_STATEID:
4584                 case -NFS4ERR_STALE_STATEID:
4585                 case -NFS4ERR_EXPIRED:
4586                         break;
4587                 default:
4588                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4589                                 rpc_restart_call_prepare(task);
4590         }
4591         nfs_release_seqid(calldata->arg.seqid);
4592 }
4593
4594 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4595 {
4596         struct nfs4_unlockdata *calldata = data;
4597
4598         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4599                 goto out_wait;
4600         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4601                 /* Note: exit _without_ running nfs4_locku_done */
4602                 goto out_no_action;
4603         }
4604         calldata->timestamp = jiffies;
4605         if (nfs4_setup_sequence(calldata->server,
4606                                 &calldata->arg.seq_args,
4607                                 &calldata->res.seq_res,
4608                                 task) != 0)
4609                 nfs_release_seqid(calldata->arg.seqid);
4610         return;
4611 out_no_action:
4612         task->tk_action = NULL;
4613 out_wait:
4614         nfs4_sequence_done(task, &calldata->res.seq_res);
4615 }
4616
4617 static const struct rpc_call_ops nfs4_locku_ops = {
4618         .rpc_call_prepare = nfs4_locku_prepare,
4619         .rpc_call_done = nfs4_locku_done,
4620         .rpc_release = nfs4_locku_release_calldata,
4621 };
4622
4623 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4624                 struct nfs_open_context *ctx,
4625                 struct nfs4_lock_state *lsp,
4626                 struct nfs_seqid *seqid)
4627 {
4628         struct nfs4_unlockdata *data;
4629         struct rpc_message msg = {
4630                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4631                 .rpc_cred = ctx->cred,
4632         };
4633         struct rpc_task_setup task_setup_data = {
4634                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4635                 .rpc_message = &msg,
4636                 .callback_ops = &nfs4_locku_ops,
4637                 .workqueue = nfsiod_workqueue,
4638                 .flags = RPC_TASK_ASYNC,
4639         };
4640
4641         /* Ensure this is an unlock - when canceling a lock, the
4642          * canceled lock is passed in, and it won't be an unlock.
4643          */
4644         fl->fl_type = F_UNLCK;
4645
4646         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4647         if (data == NULL) {
4648                 nfs_free_seqid(seqid);
4649                 return ERR_PTR(-ENOMEM);
4650         }
4651
4652         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4653         msg.rpc_argp = &data->arg;
4654         msg.rpc_resp = &data->res;
4655         task_setup_data.callback_data = data;
4656         return rpc_run_task(&task_setup_data);
4657 }
4658
4659 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4660 {
4661         struct inode *inode = state->inode;
4662         struct nfs4_state_owner *sp = state->owner;
4663         struct nfs_inode *nfsi = NFS_I(inode);
4664         struct nfs_seqid *seqid;
4665         struct nfs4_lock_state *lsp;
4666         struct rpc_task *task;
4667         int status = 0;
4668         unsigned char fl_flags = request->fl_flags;
4669
4670         status = nfs4_set_lock_state(state, request);
4671         /* Unlock _before_ we do the RPC call */
4672         request->fl_flags |= FL_EXISTS;
4673         /* Exclude nfs_delegation_claim_locks() */
4674         mutex_lock(&sp->so_delegreturn_mutex);
4675         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4676         down_read(&nfsi->rwsem);
4677         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4678                 up_read(&nfsi->rwsem);
4679                 mutex_unlock(&sp->so_delegreturn_mutex);
4680                 goto out;
4681         }
4682         up_read(&nfsi->rwsem);
4683         mutex_unlock(&sp->so_delegreturn_mutex);
4684         if (status != 0)
4685                 goto out;
4686         /* Is this a delegated lock? */
4687         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4688                 goto out;
4689         lsp = request->fl_u.nfs4_fl.owner;
4690         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4691         status = -ENOMEM;
4692         if (seqid == NULL)
4693                 goto out;
4694         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4695         status = PTR_ERR(task);
4696         if (IS_ERR(task))
4697                 goto out;
4698         status = nfs4_wait_for_completion_rpc_task(task);
4699         rpc_put_task(task);
4700 out:
4701         request->fl_flags = fl_flags;
4702         return status;
4703 }
4704
4705 struct nfs4_lockdata {
4706         struct nfs_lock_args arg;
4707         struct nfs_lock_res res;
4708         struct nfs4_lock_state *lsp;
4709         struct nfs_open_context *ctx;
4710         struct file_lock fl;
4711         unsigned long timestamp;
4712         int rpc_status;
4713         int cancelled;
4714         struct nfs_server *server;
4715 };
4716
4717 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4718                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4719                 gfp_t gfp_mask)
4720 {
4721         struct nfs4_lockdata *p;
4722         struct inode *inode = lsp->ls_state->inode;
4723         struct nfs_server *server = NFS_SERVER(inode);
4724
4725         p = kzalloc(sizeof(*p), gfp_mask);
4726         if (p == NULL)
4727                 return NULL;
4728
4729         p->arg.fh = NFS_FH(inode);
4730         p->arg.fl = &p->fl;
4731         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4732         if (p->arg.open_seqid == NULL)
4733                 goto out_free;
4734         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4735         if (p->arg.lock_seqid == NULL)
4736                 goto out_free_seqid;
4737         p->arg.lock_stateid = &lsp->ls_stateid;
4738         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4739         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4740         p->arg.lock_owner.s_dev = server->s_dev;
4741         p->res.lock_seqid = p->arg.lock_seqid;
4742         p->lsp = lsp;
4743         p->server = server;
4744         atomic_inc(&lsp->ls_count);
4745         p->ctx = get_nfs_open_context(ctx);
4746         memcpy(&p->fl, fl, sizeof(p->fl));
4747         return p;
4748 out_free_seqid:
4749         nfs_free_seqid(p->arg.open_seqid);
4750 out_free:
4751         kfree(p);
4752         return NULL;
4753 }
4754
4755 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4756 {
4757         struct nfs4_lockdata *data = calldata;
4758         struct nfs4_state *state = data->lsp->ls_state;
4759
4760         dprintk("%s: begin!\n", __func__);
4761         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4762                 goto out_wait;
4763         /* Do we need to do an open_to_lock_owner? */
4764         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4765                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4766                         goto out_release_lock_seqid;
4767                 }
4768                 data->arg.open_stateid = &state->stateid;
4769                 data->arg.new_lock_owner = 1;
4770                 data->res.open_seqid = data->arg.open_seqid;
4771         } else
4772                 data->arg.new_lock_owner = 0;
4773         if (!nfs4_valid_open_stateid(state)) {
4774                 data->rpc_status = -EBADF;
4775                 task->tk_action = NULL;
4776                 goto out_release_open_seqid;
4777         }
4778         data->timestamp = jiffies;
4779         if (nfs4_setup_sequence(data->server,
4780                                 &data->arg.seq_args,
4781                                 &data->res.seq_res,
4782                                 task) == 0)
4783                 return;
4784 out_release_open_seqid:
4785         nfs_release_seqid(data->arg.open_seqid);
4786 out_release_lock_seqid:
4787         nfs_release_seqid(data->arg.lock_seqid);
4788 out_wait:
4789         nfs4_sequence_done(task, &data->res.seq_res);
4790         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4791 }
4792
4793 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4794 {
4795         struct nfs4_lockdata *data = calldata;
4796
4797         dprintk("%s: begin!\n", __func__);
4798
4799         if (!nfs4_sequence_done(task, &data->res.seq_res))
4800                 return;
4801
4802         data->rpc_status = task->tk_status;
4803         if (data->arg.new_lock_owner != 0) {
4804                 if (data->rpc_status == 0)
4805                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4806                 else
4807                         goto out;
4808         }
4809         if (data->rpc_status == 0) {
4810                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4811                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4812                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4813         }
4814 out:
4815         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4816 }
4817
4818 static void nfs4_lock_release(void *calldata)
4819 {
4820         struct nfs4_lockdata *data = calldata;
4821
4822         dprintk("%s: begin!\n", __func__);
4823         nfs_free_seqid(data->arg.open_seqid);
4824         if (data->cancelled != 0) {
4825                 struct rpc_task *task;
4826                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4827                                 data->arg.lock_seqid);
4828                 if (!IS_ERR(task))
4829                         rpc_put_task_async(task);
4830                 dprintk("%s: cancelling lock!\n", __func__);
4831         } else
4832                 nfs_free_seqid(data->arg.lock_seqid);
4833         nfs4_put_lock_state(data->lsp);
4834         put_nfs_open_context(data->ctx);
4835         kfree(data);
4836         dprintk("%s: done!\n", __func__);
4837 }
4838
4839 static const struct rpc_call_ops nfs4_lock_ops = {
4840         .rpc_call_prepare = nfs4_lock_prepare,
4841         .rpc_call_done = nfs4_lock_done,
4842         .rpc_release = nfs4_lock_release,
4843 };
4844
4845 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4846 {
4847         switch (error) {
4848         case -NFS4ERR_ADMIN_REVOKED:
4849         case -NFS4ERR_BAD_STATEID:
4850                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4851                 if (new_lock_owner != 0 ||
4852                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4853                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4854                 break;
4855         case -NFS4ERR_STALE_STATEID:
4856                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4857         case -NFS4ERR_EXPIRED:
4858                 nfs4_schedule_lease_recovery(server->nfs_client);
4859         };
4860 }
4861
4862 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4863 {
4864         struct nfs4_lockdata *data;
4865         struct rpc_task *task;
4866         struct rpc_message msg = {
4867                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4868                 .rpc_cred = state->owner->so_cred,
4869         };
4870         struct rpc_task_setup task_setup_data = {
4871                 .rpc_client = NFS_CLIENT(state->inode),
4872                 .rpc_message = &msg,
4873                 .callback_ops = &nfs4_lock_ops,
4874                 .workqueue = nfsiod_workqueue,
4875                 .flags = RPC_TASK_ASYNC,
4876         };
4877         int ret;
4878
4879         dprintk("%s: begin!\n", __func__);
4880         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4881                         fl->fl_u.nfs4_fl.owner,
4882                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4883         if (data == NULL)
4884                 return -ENOMEM;
4885         if (IS_SETLKW(cmd))
4886                 data->arg.block = 1;
4887         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4888         msg.rpc_argp = &data->arg;
4889         msg.rpc_resp = &data->res;
4890         task_setup_data.callback_data = data;
4891         if (recovery_type > NFS_LOCK_NEW) {
4892                 if (recovery_type == NFS_LOCK_RECLAIM)
4893                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4894                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4895         }
4896         task = rpc_run_task(&task_setup_data);
4897         if (IS_ERR(task))
4898                 return PTR_ERR(task);
4899         ret = nfs4_wait_for_completion_rpc_task(task);
4900         if (ret == 0) {
4901                 ret = data->rpc_status;
4902                 if (ret)
4903                         nfs4_handle_setlk_error(data->server, data->lsp,
4904                                         data->arg.new_lock_owner, ret);
4905         } else
4906                 data->cancelled = 1;
4907         rpc_put_task(task);
4908         dprintk("%s: done, ret = %d!\n", __func__, ret);
4909         return ret;
4910 }
4911
4912 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4913 {
4914         struct nfs_server *server = NFS_SERVER(state->inode);
4915         struct nfs4_exception exception = {
4916                 .inode = state->inode,
4917         };
4918         int err;
4919
4920         do {
4921                 /* Cache the lock if possible... */
4922                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4923                         return 0;
4924                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4925                 if (err != -NFS4ERR_DELAY)
4926                         break;
4927                 nfs4_handle_exception(server, err, &exception);
4928         } while (exception.retry);
4929         return err;
4930 }
4931
4932 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4933 {
4934         struct nfs_server *server = NFS_SERVER(state->inode);
4935         struct nfs4_exception exception = {
4936                 .inode = state->inode,
4937         };
4938         int err;
4939
4940         err = nfs4_set_lock_state(state, request);
4941         if (err != 0)
4942                 return err;
4943         do {
4944                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4945                         return 0;
4946                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4947                 switch (err) {
4948                 default:
4949                         goto out;
4950                 case -NFS4ERR_GRACE:
4951                 case -NFS4ERR_DELAY:
4952                         nfs4_handle_exception(server, err, &exception);
4953                         err = 0;
4954                 }
4955         } while (exception.retry);
4956 out:
4957         return err;
4958 }
4959
4960 #if defined(CONFIG_NFS_V4_1)
4961 /**
4962  * nfs41_check_expired_locks - possibly free a lock stateid
4963  *
4964  * @state: NFSv4 state for an inode
4965  *
4966  * Returns NFS_OK if recovery for this stateid is now finished.
4967  * Otherwise a negative NFS4ERR value is returned.
4968  */
4969 static int nfs41_check_expired_locks(struct nfs4_state *state)
4970 {
4971         int status, ret = -NFS4ERR_BAD_STATEID;
4972         struct nfs4_lock_state *lsp;
4973         struct nfs_server *server = NFS_SERVER(state->inode);
4974
4975         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4976                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4977                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4978                         if (status != NFS_OK) {
4979                                 /* Free the stateid unless the server
4980                                  * informs us the stateid is unrecognized. */
4981                                 if (status != -NFS4ERR_BAD_STATEID)
4982                                         nfs41_free_stateid(server,
4983                                                         &lsp->ls_stateid);
4984                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4985                                 ret = status;
4986                         }
4987                 }
4988         };
4989
4990         return ret;
4991 }
4992
4993 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4994 {
4995         int status = NFS_OK;
4996
4997         if (test_bit(LK_STATE_IN_USE, &state->flags))
4998                 status = nfs41_check_expired_locks(state);
4999         if (status != NFS_OK)
5000                 status = nfs4_lock_expired(state, request);
5001         return status;
5002 }
5003 #endif
5004
5005 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5006 {
5007         struct nfs4_state_owner *sp = state->owner;
5008         struct nfs_inode *nfsi = NFS_I(state->inode);
5009         unsigned char fl_flags = request->fl_flags;
5010         unsigned int seq;
5011         int status = -ENOLCK;
5012
5013         if ((fl_flags & FL_POSIX) &&
5014                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5015                 goto out;
5016         /* Is this a delegated open? */
5017         status = nfs4_set_lock_state(state, request);
5018         if (status != 0)
5019                 goto out;
5020         request->fl_flags |= FL_ACCESS;
5021         status = do_vfs_lock(request->fl_file, request);
5022         if (status < 0)
5023                 goto out;
5024         down_read(&nfsi->rwsem);
5025         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5026                 /* Yes: cache locks! */
5027                 /* ...but avoid races with delegation recall... */
5028                 request->fl_flags = fl_flags & ~FL_SLEEP;
5029                 status = do_vfs_lock(request->fl_file, request);
5030                 goto out_unlock;
5031         }
5032         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5033         up_read(&nfsi->rwsem);
5034         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5035         if (status != 0)
5036                 goto out;
5037         down_read(&nfsi->rwsem);
5038         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5039                 status = -NFS4ERR_DELAY;
5040                 goto out_unlock;
5041         }
5042         /* Note: we always want to sleep here! */
5043         request->fl_flags = fl_flags | FL_SLEEP;
5044         if (do_vfs_lock(request->fl_file, request) < 0)
5045                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5046                         "manager!\n", __func__);
5047 out_unlock:
5048         up_read(&nfsi->rwsem);
5049 out:
5050         request->fl_flags = fl_flags;
5051         return status;
5052 }
5053
5054 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5055 {
5056         struct nfs4_exception exception = {
5057                 .state = state,
5058                 .inode = state->inode,
5059         };
5060         int err;
5061
5062         do {
5063                 err = _nfs4_proc_setlk(state, cmd, request);
5064                 if (err == -NFS4ERR_DENIED)
5065                         err = -EAGAIN;
5066                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5067                                 err, &exception);
5068         } while (exception.retry);
5069         return err;
5070 }
5071
5072 static int
5073 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5074 {
5075         struct nfs_open_context *ctx;
5076         struct nfs4_state *state;
5077         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5078         int status;
5079
5080         /* verify open state */
5081         ctx = nfs_file_open_context(filp);
5082         state = ctx->state;
5083
5084         if (request->fl_start < 0 || request->fl_end < 0)
5085                 return -EINVAL;
5086
5087         if (IS_GETLK(cmd)) {
5088                 if (state != NULL)
5089                         return nfs4_proc_getlk(state, F_GETLK, request);
5090                 return 0;
5091         }
5092
5093         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5094                 return -EINVAL;
5095
5096         if (request->fl_type == F_UNLCK) {
5097                 if (state != NULL)
5098                         return nfs4_proc_unlck(state, cmd, request);
5099                 return 0;
5100         }
5101
5102         if (state == NULL)
5103                 return -ENOLCK;
5104         /*
5105          * Don't rely on the VFS having checked the file open mode,
5106          * since it won't do this for flock() locks.
5107          */
5108         switch (request->fl_type) {
5109         case F_RDLCK:
5110                 if (!(filp->f_mode & FMODE_READ))
5111                         return -EBADF;
5112                 break;
5113         case F_WRLCK:
5114                 if (!(filp->f_mode & FMODE_WRITE))
5115                         return -EBADF;
5116         }
5117
5118         do {
5119                 status = nfs4_proc_setlk(state, cmd, request);
5120                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5121                         break;
5122                 timeout = nfs4_set_lock_task_retry(timeout);
5123                 status = -ERESTARTSYS;
5124                 if (signalled())
5125                         break;
5126         } while(status < 0);
5127         return status;
5128 }
5129
5130 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
5131 {
5132         struct nfs_server *server = NFS_SERVER(state->inode);
5133         int err;
5134
5135         err = nfs4_set_lock_state(state, fl);
5136         if (err != 0)
5137                 goto out;
5138         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5139         switch (err) {
5140                 default:
5141                         printk(KERN_ERR "NFS: %s: unhandled error "
5142                                 "%d.\n", __func__, err);
5143                 case 0:
5144                 case -ESTALE:
5145                         goto out;
5146                 case -NFS4ERR_STALE_CLIENTID:
5147                 case -NFS4ERR_STALE_STATEID:
5148                         set_bit(NFS_DELEGATED_STATE, &state->flags);
5149                 case -NFS4ERR_EXPIRED:
5150                         nfs4_schedule_lease_recovery(server->nfs_client);
5151                         return -EAGAIN;
5152                 case -NFS4ERR_BADSESSION:
5153                 case -NFS4ERR_BADSLOT:
5154                 case -NFS4ERR_BAD_HIGH_SLOT:
5155                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5156                 case -NFS4ERR_DEADSESSION:
5157                         set_bit(NFS_DELEGATED_STATE, &state->flags);
5158                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5159                         return -EAGAIN;
5160                 case -NFS4ERR_DELEG_REVOKED:
5161                 case -NFS4ERR_ADMIN_REVOKED:
5162                 case -NFS4ERR_BAD_STATEID:
5163                 case -NFS4ERR_OPENMODE:
5164                         nfs4_schedule_stateid_recovery(server, state);
5165                         return 0;
5166                 case -NFS4ERR_DELAY:
5167                 case -NFS4ERR_GRACE:
5168                         set_bit(NFS_DELEGATED_STATE, &state->flags);
5169                         ssleep(1);
5170                         return -EAGAIN;
5171                 case -ENOMEM:
5172                 case -NFS4ERR_DENIED:
5173                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5174                         return 0;
5175         }
5176 out:
5177         return err;
5178 }
5179
5180 struct nfs_release_lockowner_data {
5181         struct nfs4_lock_state *lsp;
5182         struct nfs_server *server;
5183         struct nfs_release_lockowner_args args;
5184 };
5185
5186 static void nfs4_release_lockowner_release(void *calldata)
5187 {
5188         struct nfs_release_lockowner_data *data = calldata;
5189         nfs4_free_lock_state(data->server, data->lsp);
5190         kfree(calldata);
5191 }
5192
5193 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5194         .rpc_release = nfs4_release_lockowner_release,
5195 };
5196
5197 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5198 {
5199         struct nfs_server *server = lsp->ls_state->owner->so_server;
5200         struct nfs_release_lockowner_data *data;
5201         struct rpc_message msg = {
5202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5203         };
5204
5205         if (server->nfs_client->cl_mvops->minor_version != 0)
5206                 return -EINVAL;
5207         data = kmalloc(sizeof(*data), GFP_NOFS);
5208         if (!data)
5209                 return -ENOMEM;
5210         data->lsp = lsp;
5211         data->server = server;
5212         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5213         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5214         data->args.lock_owner.s_dev = server->s_dev;
5215         msg.rpc_argp = &data->args;
5216         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5217         return 0;
5218 }
5219
5220 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5221
5222 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5223                                    const void *buf, size_t buflen,
5224                                    int flags, int type)
5225 {
5226         if (strcmp(key, "") != 0)
5227                 return -EINVAL;
5228
5229         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5230 }
5231
5232 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5233                                    void *buf, size_t buflen, int type)
5234 {
5235         if (strcmp(key, "") != 0)
5236                 return -EINVAL;
5237
5238         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5239 }
5240
5241 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5242                                        size_t list_len, const char *name,
5243                                        size_t name_len, int type)
5244 {
5245         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5246
5247         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5248                 return 0;
5249
5250         if (list && len <= list_len)
5251                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5252         return len;
5253 }
5254
5255 /*
5256  * nfs_fhget will use either the mounted_on_fileid or the fileid
5257  */
5258 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5259 {
5260         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5261                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5262               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5263               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5264                 return;
5265
5266         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5267                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5268         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5269         fattr->nlink = 2;
5270 }
5271
5272 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5273                                    const struct qstr *name,
5274                                    struct nfs4_fs_locations *fs_locations,
5275                                    struct page *page)
5276 {
5277         struct nfs_server *server = NFS_SERVER(dir);
5278         u32 bitmask[2] = {
5279                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5280         };
5281         struct nfs4_fs_locations_arg args = {
5282                 .dir_fh = NFS_FH(dir),
5283                 .name = name,
5284                 .page = page,
5285                 .bitmask = bitmask,
5286         };
5287         struct nfs4_fs_locations_res res = {
5288                 .fs_locations = fs_locations,
5289         };
5290         struct rpc_message msg = {
5291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5292                 .rpc_argp = &args,
5293                 .rpc_resp = &res,
5294         };
5295         int status;
5296
5297         dprintk("%s: start\n", __func__);
5298
5299         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5300          * is not supported */
5301         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5302                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5303         else
5304                 bitmask[0] |= FATTR4_WORD0_FILEID;
5305
5306         nfs_fattr_init(&fs_locations->fattr);
5307         fs_locations->server = server;
5308         fs_locations->nlocations = 0;
5309         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5310         dprintk("%s: returned status = %d\n", __func__, status);
5311         return status;
5312 }
5313
5314 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5315                            const struct qstr *name,
5316                            struct nfs4_fs_locations *fs_locations,
5317                            struct page *page)
5318 {
5319         struct nfs4_exception exception = { };
5320         int err;
5321         do {
5322                 err = nfs4_handle_exception(NFS_SERVER(dir),
5323                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5324                                 &exception);
5325         } while (exception.retry);
5326         return err;
5327 }
5328
5329 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5330 {
5331         int status;
5332         struct nfs4_secinfo_arg args = {
5333                 .dir_fh = NFS_FH(dir),
5334                 .name   = name,
5335         };
5336         struct nfs4_secinfo_res res = {
5337                 .flavors     = flavors,
5338         };
5339         struct rpc_message msg = {
5340                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5341                 .rpc_argp = &args,
5342                 .rpc_resp = &res,
5343         };
5344
5345         dprintk("NFS call  secinfo %s\n", name->name);
5346         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5347         dprintk("NFS reply  secinfo: %d\n", status);
5348         return status;
5349 }
5350
5351 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5352                       struct nfs4_secinfo_flavors *flavors)
5353 {
5354         struct nfs4_exception exception = { };
5355         int err;
5356         do {
5357                 err = nfs4_handle_exception(NFS_SERVER(dir),
5358                                 _nfs4_proc_secinfo(dir, name, flavors),
5359                                 &exception);
5360         } while (exception.retry);
5361         return err;
5362 }
5363
5364 #ifdef CONFIG_NFS_V4_1
5365 /*
5366  * Check the exchange flags returned by the server for invalid flags, having
5367  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5368  * DS flags set.
5369  */
5370 static int nfs4_check_cl_exchange_flags(u32 flags)
5371 {
5372         if (flags & ~EXCHGID4_FLAG_MASK_R)
5373                 goto out_inval;
5374         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5375             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5376                 goto out_inval;
5377         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5378                 goto out_inval;
5379         return NFS_OK;
5380 out_inval:
5381         return -NFS4ERR_INVAL;
5382 }
5383
5384 static bool
5385 nfs41_same_server_scope(struct nfs41_server_scope *a,
5386                         struct nfs41_server_scope *b)
5387 {
5388         if (a->server_scope_sz == b->server_scope_sz &&
5389             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5390                 return true;
5391
5392         return false;
5393 }
5394
5395 /*
5396  * nfs4_proc_bind_conn_to_session()
5397  *
5398  * The 4.1 client currently uses the same TCP connection for the
5399  * fore and backchannel.
5400  */
5401 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5402 {
5403         int status;
5404         struct nfs41_bind_conn_to_session_res res;
5405         struct rpc_message msg = {
5406                 .rpc_proc =
5407                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5408                 .rpc_argp = clp,
5409                 .rpc_resp = &res,
5410                 .rpc_cred = cred,
5411         };
5412
5413         dprintk("--> %s\n", __func__);
5414
5415         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5416         if (unlikely(res.session == NULL)) {
5417                 status = -ENOMEM;
5418                 goto out;
5419         }
5420
5421         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5422         if (status == 0) {
5423                 if (memcmp(res.session->sess_id.data,
5424                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5425                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5426                         status = -EIO;
5427                         goto out_session;
5428                 }
5429                 if (res.dir != NFS4_CDFS4_BOTH) {
5430                         dprintk("NFS: %s: Unexpected direction from server\n",
5431                                 __func__);
5432                         status = -EIO;
5433                         goto out_session;
5434                 }
5435                 if (res.use_conn_in_rdma_mode) {
5436                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5437                                 __func__);
5438                         status = -EIO;
5439                         goto out_session;
5440                 }
5441         }
5442 out_session:
5443         kfree(res.session);
5444 out:
5445         dprintk("<-- %s status= %d\n", __func__, status);
5446         return status;
5447 }
5448
5449 /*
5450  * nfs4_proc_exchange_id()
5451  *
5452  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5453  *
5454  * Since the clientid has expired, all compounds using sessions
5455  * associated with the stale clientid will be returning
5456  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5457  * be in some phase of session reset.
5458  */
5459 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5460 {
5461         nfs4_verifier verifier;
5462         struct nfs41_exchange_id_args args = {
5463                 .verifier = &verifier,
5464                 .client = clp,
5465                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5466         };
5467         struct nfs41_exchange_id_res res = {
5468                 0
5469         };
5470         int status;
5471         struct rpc_message msg = {
5472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5473                 .rpc_argp = &args,
5474                 .rpc_resp = &res,
5475                 .rpc_cred = cred,
5476         };
5477
5478         nfs4_init_boot_verifier(clp, &verifier);
5479         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5480                                                         sizeof(args.id));
5481         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5482                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5483                 args.id_len, args.id);
5484
5485         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5486                                         GFP_NOFS);
5487         if (unlikely(res.server_owner == NULL)) {
5488                 status = -ENOMEM;
5489                 goto out;
5490         }
5491
5492         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5493                                         GFP_NOFS);
5494         if (unlikely(res.server_scope == NULL)) {
5495                 status = -ENOMEM;
5496                 goto out_server_owner;
5497         }
5498
5499         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5500         if (unlikely(res.impl_id == NULL)) {
5501                 status = -ENOMEM;
5502                 goto out_server_scope;
5503         }
5504
5505         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5506         if (status == 0)
5507                 status = nfs4_check_cl_exchange_flags(res.flags);
5508
5509         if (status == 0) {
5510                 clp->cl_clientid = res.clientid;
5511                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5512                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5513                         clp->cl_seqid = res.seqid;
5514
5515                 kfree(clp->cl_serverowner);
5516                 clp->cl_serverowner = res.server_owner;
5517                 res.server_owner = NULL;
5518
5519                 /* use the most recent implementation id */
5520                 kfree(clp->cl_implid);
5521                 clp->cl_implid = res.impl_id;
5522
5523                 if (clp->cl_serverscope != NULL &&
5524                     !nfs41_same_server_scope(clp->cl_serverscope,
5525                                              res.server_scope)) {
5526                         dprintk("%s: server_scope mismatch detected\n",
5527                                 __func__);
5528                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5529                         kfree(clp->cl_serverscope);
5530                         clp->cl_serverscope = NULL;
5531                 }
5532
5533                 if (clp->cl_serverscope == NULL) {
5534                         clp->cl_serverscope = res.server_scope;
5535                         goto out;
5536                 }
5537         } else
5538                 kfree(res.impl_id);
5539
5540 out_server_owner:
5541         kfree(res.server_owner);
5542 out_server_scope:
5543         kfree(res.server_scope);
5544 out:
5545         if (clp->cl_implid != NULL)
5546                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5547                         "domain: %s, name: %s, date: %llu,%u\n",
5548                         clp->cl_implid->domain, clp->cl_implid->name,
5549                         clp->cl_implid->date.seconds,
5550                         clp->cl_implid->date.nseconds);
5551         dprintk("NFS reply exchange_id: %d\n", status);
5552         return status;
5553 }
5554
5555 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5556                 struct rpc_cred *cred)
5557 {
5558         struct rpc_message msg = {
5559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5560                 .rpc_argp = clp,
5561                 .rpc_cred = cred,
5562         };
5563         int status;
5564
5565         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5566         if (status)
5567                 dprintk("NFS: Got error %d from the server %s on "
5568                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5569         return status;
5570 }
5571
5572 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5573                 struct rpc_cred *cred)
5574 {
5575         unsigned int loop;
5576         int ret;
5577
5578         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5579                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5580                 switch (ret) {
5581                 case -NFS4ERR_DELAY:
5582                 case -NFS4ERR_CLIENTID_BUSY:
5583                         ssleep(1);
5584                         break;
5585                 default:
5586                         return ret;
5587                 }
5588         }
5589         return 0;
5590 }
5591
5592 int nfs4_destroy_clientid(struct nfs_client *clp)
5593 {
5594         struct rpc_cred *cred;
5595         int ret = 0;
5596
5597         if (clp->cl_mvops->minor_version < 1)
5598                 goto out;
5599         if (clp->cl_exchange_flags == 0)
5600                 goto out;
5601         if (clp->cl_preserve_clid)
5602                 goto out;
5603         cred = nfs4_get_exchange_id_cred(clp);
5604         ret = nfs4_proc_destroy_clientid(clp, cred);
5605         if (cred)
5606                 put_rpccred(cred);
5607         switch (ret) {
5608         case 0:
5609         case -NFS4ERR_STALE_CLIENTID:
5610                 clp->cl_exchange_flags = 0;
5611         }
5612 out:
5613         return ret;
5614 }
5615
5616 struct nfs4_get_lease_time_data {
5617         struct nfs4_get_lease_time_args *args;
5618         struct nfs4_get_lease_time_res *res;
5619         struct nfs_client *clp;
5620 };
5621
5622 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5623                                         void *calldata)
5624 {
5625         struct nfs4_get_lease_time_data *data =
5626                         (struct nfs4_get_lease_time_data *)calldata;
5627
5628         dprintk("--> %s\n", __func__);
5629         /* just setup sequence, do not trigger session recovery
5630            since we're invoked within one */
5631         nfs41_setup_sequence(data->clp->cl_session,
5632                         &data->args->la_seq_args,
5633                         &data->res->lr_seq_res,
5634                         task);
5635         dprintk("<-- %s\n", __func__);
5636 }
5637
5638 /*
5639  * Called from nfs4_state_manager thread for session setup, so don't recover
5640  * from sequence operation or clientid errors.
5641  */
5642 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5643 {
5644         struct nfs4_get_lease_time_data *data =
5645                         (struct nfs4_get_lease_time_data *)calldata;
5646
5647         dprintk("--> %s\n", __func__);
5648         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5649                 return;
5650         switch (task->tk_status) {
5651         case -NFS4ERR_DELAY:
5652         case -NFS4ERR_GRACE:
5653                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5654                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5655                 task->tk_status = 0;
5656                 /* fall through */
5657         case -NFS4ERR_RETRY_UNCACHED_REP:
5658                 rpc_restart_call_prepare(task);
5659                 return;
5660         }
5661         dprintk("<-- %s\n", __func__);
5662 }
5663
5664 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5665         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5666         .rpc_call_done = nfs4_get_lease_time_done,
5667 };
5668
5669 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5670 {
5671         struct rpc_task *task;
5672         struct nfs4_get_lease_time_args args;
5673         struct nfs4_get_lease_time_res res = {
5674                 .lr_fsinfo = fsinfo,
5675         };
5676         struct nfs4_get_lease_time_data data = {
5677                 .args = &args,
5678                 .res = &res,
5679                 .clp = clp,
5680         };
5681         struct rpc_message msg = {
5682                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5683                 .rpc_argp = &args,
5684                 .rpc_resp = &res,
5685         };
5686         struct rpc_task_setup task_setup = {
5687                 .rpc_client = clp->cl_rpcclient,
5688                 .rpc_message = &msg,
5689                 .callback_ops = &nfs4_get_lease_time_ops,
5690                 .callback_data = &data,
5691                 .flags = RPC_TASK_TIMEOUT,
5692         };
5693         int status;
5694
5695         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5696         nfs4_set_sequence_privileged(&args.la_seq_args);
5697         dprintk("--> %s\n", __func__);
5698         task = rpc_run_task(&task_setup);
5699
5700         if (IS_ERR(task))
5701                 status = PTR_ERR(task);
5702         else {
5703                 status = task->tk_status;
5704                 rpc_put_task(task);
5705         }
5706         dprintk("<-- %s return %d\n", __func__, status);
5707
5708         return status;
5709 }
5710
5711 /*
5712  * Initialize the values to be used by the client in CREATE_SESSION
5713  * If nfs4_init_session set the fore channel request and response sizes,
5714  * use them.
5715  *
5716  * Set the back channel max_resp_sz_cached to zero to force the client to
5717  * always set csa_cachethis to FALSE because the current implementation
5718  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5719  */
5720 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5721 {
5722         struct nfs4_session *session = args->client->cl_session;
5723         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5724                      mxresp_sz = session->fc_target_max_resp_sz;
5725
5726         if (mxrqst_sz == 0)
5727                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5728         if (mxresp_sz == 0)
5729                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5730         /* Fore channel attributes */
5731         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5732         args->fc_attrs.max_resp_sz = mxresp_sz;
5733         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5734         args->fc_attrs.max_reqs = max_session_slots;
5735
5736         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5737                 "max_ops=%u max_reqs=%u\n",
5738                 __func__,
5739                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5740                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5741
5742         /* Back channel attributes */
5743         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5744         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5745         args->bc_attrs.max_resp_sz_cached = 0;
5746         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5747         args->bc_attrs.max_reqs = 1;
5748
5749         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5750                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5751                 __func__,
5752                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5753                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5754                 args->bc_attrs.max_reqs);
5755 }
5756
5757 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5758 {
5759         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5760         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5761
5762         if (rcvd->max_resp_sz > sent->max_resp_sz)
5763                 return -EINVAL;
5764         /*
5765          * Our requested max_ops is the minimum we need; we're not
5766          * prepared to break up compounds into smaller pieces than that.
5767          * So, no point even trying to continue if the server won't
5768          * cooperate:
5769          */
5770         if (rcvd->max_ops < sent->max_ops)
5771                 return -EINVAL;
5772         if (rcvd->max_reqs == 0)
5773                 return -EINVAL;
5774         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5775                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5776         return 0;
5777 }
5778
5779 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5780 {
5781         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5782         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5783
5784         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5785                 return -EINVAL;
5786         if (rcvd->max_resp_sz < sent->max_resp_sz)
5787                 return -EINVAL;
5788         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5789                 return -EINVAL;
5790         /* These would render the backchannel useless: */
5791         if (rcvd->max_ops != sent->max_ops)
5792                 return -EINVAL;
5793         if (rcvd->max_reqs != sent->max_reqs)
5794                 return -EINVAL;
5795         return 0;
5796 }
5797
5798 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5799                                      struct nfs4_session *session)
5800 {
5801         int ret;
5802
5803         ret = nfs4_verify_fore_channel_attrs(args, session);
5804         if (ret)
5805                 return ret;
5806         return nfs4_verify_back_channel_attrs(args, session);
5807 }
5808
5809 static int _nfs4_proc_create_session(struct nfs_client *clp,
5810                 struct rpc_cred *cred)
5811 {
5812         struct nfs4_session *session = clp->cl_session;
5813         struct nfs41_create_session_args args = {
5814                 .client = clp,
5815                 .cb_program = NFS4_CALLBACK,
5816         };
5817         struct nfs41_create_session_res res = {
5818                 .client = clp,
5819         };
5820         struct rpc_message msg = {
5821                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5822                 .rpc_argp = &args,
5823                 .rpc_resp = &res,
5824                 .rpc_cred = cred,
5825         };
5826         int status;
5827
5828         nfs4_init_channel_attrs(&args);
5829         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5830
5831         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5832
5833         if (!status) {
5834                 /* Verify the session's negotiated channel_attrs values */
5835                 status = nfs4_verify_channel_attrs(&args, session);
5836                 /* Increment the clientid slot sequence id */
5837                 clp->cl_seqid++;
5838         }
5839
5840         return status;
5841 }
5842
5843 /*
5844  * Issues a CREATE_SESSION operation to the server.
5845  * It is the responsibility of the caller to verify the session is
5846  * expired before calling this routine.
5847  */
5848 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5849 {
5850         int status;
5851         unsigned *ptr;
5852         struct nfs4_session *session = clp->cl_session;
5853
5854         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5855
5856         status = _nfs4_proc_create_session(clp, cred);
5857         if (status)
5858                 goto out;
5859
5860         /* Init or reset the session slot tables */
5861         status = nfs4_setup_session_slot_tables(session);
5862         dprintk("slot table setup returned %d\n", status);
5863         if (status)
5864                 goto out;
5865
5866         ptr = (unsigned *)&session->sess_id.data[0];
5867         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5868                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5869 out:
5870         dprintk("<-- %s\n", __func__);
5871         return status;
5872 }
5873
5874 /*
5875  * Issue the over-the-wire RPC DESTROY_SESSION.
5876  * The caller must serialize access to this routine.
5877  */
5878 int nfs4_proc_destroy_session(struct nfs4_session *session,
5879                 struct rpc_cred *cred)
5880 {
5881         struct rpc_message msg = {
5882                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5883                 .rpc_argp = session,
5884                 .rpc_cred = cred,
5885         };
5886         int status = 0;
5887
5888         dprintk("--> nfs4_proc_destroy_session\n");
5889
5890         /* session is still being setup */
5891         if (session->clp->cl_cons_state != NFS_CS_READY)
5892                 return status;
5893
5894         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5895
5896         if (status)
5897                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5898                         "Session has been destroyed regardless...\n", status);
5899
5900         dprintk("<-- nfs4_proc_destroy_session\n");
5901         return status;
5902 }
5903
5904 /*
5905  * Renew the cl_session lease.
5906  */
5907 struct nfs4_sequence_data {
5908         struct nfs_client *clp;
5909         struct nfs4_sequence_args args;
5910         struct nfs4_sequence_res res;
5911 };
5912
5913 static void nfs41_sequence_release(void *data)
5914 {
5915         struct nfs4_sequence_data *calldata = data;
5916         struct nfs_client *clp = calldata->clp;
5917
5918         if (atomic_read(&clp->cl_count) > 1)
5919                 nfs4_schedule_state_renewal(clp);
5920         nfs_put_client(clp);
5921         kfree(calldata);
5922 }
5923
5924 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5925 {
5926         switch(task->tk_status) {
5927         case -NFS4ERR_DELAY:
5928                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5929                 return -EAGAIN;
5930         default:
5931                 nfs4_schedule_lease_recovery(clp);
5932         }
5933         return 0;
5934 }
5935
5936 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5937 {
5938         struct nfs4_sequence_data *calldata = data;
5939         struct nfs_client *clp = calldata->clp;
5940
5941         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5942                 return;
5943
5944         if (task->tk_status < 0) {
5945                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5946                 if (atomic_read(&clp->cl_count) == 1)
5947                         goto out;
5948
5949                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5950                         rpc_restart_call_prepare(task);
5951                         return;
5952                 }
5953         }
5954         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5955 out:
5956         dprintk("<-- %s\n", __func__);
5957 }
5958
5959 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5960 {
5961         struct nfs4_sequence_data *calldata = data;
5962         struct nfs_client *clp = calldata->clp;
5963         struct nfs4_sequence_args *args;
5964         struct nfs4_sequence_res *res;
5965
5966         args = task->tk_msg.rpc_argp;
5967         res = task->tk_msg.rpc_resp;
5968
5969         nfs41_setup_sequence(clp->cl_session, args, res, task);
5970 }
5971
5972 static const struct rpc_call_ops nfs41_sequence_ops = {
5973         .rpc_call_done = nfs41_sequence_call_done,
5974         .rpc_call_prepare = nfs41_sequence_prepare,
5975         .rpc_release = nfs41_sequence_release,
5976 };
5977
5978 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5979                 struct rpc_cred *cred,
5980                 bool is_privileged)
5981 {
5982         struct nfs4_sequence_data *calldata;
5983         struct rpc_message msg = {
5984                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5985                 .rpc_cred = cred,
5986         };
5987         struct rpc_task_setup task_setup_data = {
5988                 .rpc_client = clp->cl_rpcclient,
5989                 .rpc_message = &msg,
5990                 .callback_ops = &nfs41_sequence_ops,
5991                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5992         };
5993
5994         if (!atomic_inc_not_zero(&clp->cl_count))
5995                 return ERR_PTR(-EIO);
5996         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5997         if (calldata == NULL) {
5998                 nfs_put_client(clp);
5999                 return ERR_PTR(-ENOMEM);
6000         }
6001         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6002         if (is_privileged)
6003                 nfs4_set_sequence_privileged(&calldata->args);
6004         msg.rpc_argp = &calldata->args;
6005         msg.rpc_resp = &calldata->res;
6006         calldata->clp = clp;
6007         task_setup_data.callback_data = calldata;
6008
6009         return rpc_run_task(&task_setup_data);
6010 }
6011
6012 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6013 {
6014         struct rpc_task *task;
6015         int ret = 0;
6016
6017         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6018                 return 0;
6019         task = _nfs41_proc_sequence(clp, cred, false);
6020         if (IS_ERR(task))
6021                 ret = PTR_ERR(task);
6022         else
6023                 rpc_put_task_async(task);
6024         dprintk("<-- %s status=%d\n", __func__, ret);
6025         return ret;
6026 }
6027
6028 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6029 {
6030         struct rpc_task *task;
6031         int ret;
6032
6033         task = _nfs41_proc_sequence(clp, cred, true);
6034         if (IS_ERR(task)) {
6035                 ret = PTR_ERR(task);
6036                 goto out;
6037         }
6038         ret = rpc_wait_for_completion_task(task);
6039         if (!ret) {
6040                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6041
6042                 if (task->tk_status == 0)
6043                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6044                 ret = task->tk_status;
6045         }
6046         rpc_put_task(task);
6047 out:
6048         dprintk("<-- %s status=%d\n", __func__, ret);
6049         return ret;
6050 }
6051
6052 struct nfs4_reclaim_complete_data {
6053         struct nfs_client *clp;
6054         struct nfs41_reclaim_complete_args arg;
6055         struct nfs41_reclaim_complete_res res;
6056 };
6057
6058 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6059 {
6060         struct nfs4_reclaim_complete_data *calldata = data;
6061
6062         nfs41_setup_sequence(calldata->clp->cl_session,
6063                         &calldata->arg.seq_args,
6064                         &calldata->res.seq_res,
6065                         task);
6066 }
6067
6068 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6069 {
6070         switch(task->tk_status) {
6071         case 0:
6072         case -NFS4ERR_COMPLETE_ALREADY:
6073         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6074                 break;
6075         case -NFS4ERR_DELAY:
6076                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6077                 /* fall through */
6078         case -NFS4ERR_RETRY_UNCACHED_REP:
6079                 return -EAGAIN;
6080         default:
6081                 nfs4_schedule_lease_recovery(clp);
6082         }
6083         return 0;
6084 }
6085
6086 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6087 {
6088         struct nfs4_reclaim_complete_data *calldata = data;
6089         struct nfs_client *clp = calldata->clp;
6090         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6091
6092         dprintk("--> %s\n", __func__);
6093         if (!nfs41_sequence_done(task, res))
6094                 return;
6095
6096         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6097                 rpc_restart_call_prepare(task);
6098                 return;
6099         }
6100         dprintk("<-- %s\n", __func__);
6101 }
6102
6103 static void nfs4_free_reclaim_complete_data(void *data)
6104 {
6105         struct nfs4_reclaim_complete_data *calldata = data;
6106
6107         kfree(calldata);
6108 }
6109
6110 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6111         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6112         .rpc_call_done = nfs4_reclaim_complete_done,
6113         .rpc_release = nfs4_free_reclaim_complete_data,
6114 };
6115
6116 /*
6117  * Issue a global reclaim complete.
6118  */
6119 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6120 {
6121         struct nfs4_reclaim_complete_data *calldata;
6122         struct rpc_task *task;
6123         struct rpc_message msg = {
6124                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6125         };
6126         struct rpc_task_setup task_setup_data = {
6127                 .rpc_client = clp->cl_rpcclient,
6128                 .rpc_message = &msg,
6129                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6130                 .flags = RPC_TASK_ASYNC,
6131         };
6132         int status = -ENOMEM;
6133
6134         dprintk("--> %s\n", __func__);
6135         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6136         if (calldata == NULL)
6137                 goto out;
6138         calldata->clp = clp;
6139         calldata->arg.one_fs = 0;
6140
6141         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6142         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6143         msg.rpc_argp = &calldata->arg;
6144         msg.rpc_resp = &calldata->res;
6145         task_setup_data.callback_data = calldata;
6146         task = rpc_run_task(&task_setup_data);
6147         if (IS_ERR(task)) {
6148                 status = PTR_ERR(task);
6149                 goto out;
6150         }
6151         status = nfs4_wait_for_completion_rpc_task(task);
6152         if (status == 0)
6153                 status = task->tk_status;
6154         rpc_put_task(task);
6155         return 0;
6156 out:
6157         dprintk("<-- %s status=%d\n", __func__, status);
6158         return status;
6159 }
6160
6161 static void
6162 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6163 {
6164         struct nfs4_layoutget *lgp = calldata;
6165         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6166         struct nfs4_session *session = nfs4_get_session(server);
6167
6168         dprintk("--> %s\n", __func__);
6169         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6170          * right now covering the LAYOUTGET we are about to send.
6171          * However, that is not so catastrophic, and there seems
6172          * to be no way to prevent it completely.
6173          */
6174         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6175                                 &lgp->res.seq_res, task))
6176                 return;
6177         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6178                                           NFS_I(lgp->args.inode)->layout,
6179                                           lgp->args.ctx->state)) {
6180                 rpc_exit(task, NFS4_OK);
6181         }
6182 }
6183
6184 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6185 {
6186         struct nfs4_layoutget *lgp = calldata;
6187         struct inode *inode = lgp->args.inode;
6188         struct nfs_server *server = NFS_SERVER(inode);
6189         struct pnfs_layout_hdr *lo;
6190         struct nfs4_state *state = NULL;
6191         unsigned long timeo, giveup;
6192
6193         dprintk("--> %s\n", __func__);
6194
6195         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6196                 goto out;
6197
6198         switch (task->tk_status) {
6199         case 0:
6200                 goto out;
6201         case -NFS4ERR_LAYOUTTRYLATER:
6202         case -NFS4ERR_RECALLCONFLICT:
6203                 timeo = rpc_get_timeout(task->tk_client);
6204                 giveup = lgp->args.timestamp + timeo;
6205                 if (time_after(giveup, jiffies))
6206                         task->tk_status = -NFS4ERR_DELAY;
6207                 break;
6208         case -NFS4ERR_EXPIRED:
6209         case -NFS4ERR_BAD_STATEID:
6210                 spin_lock(&inode->i_lock);
6211                 lo = NFS_I(inode)->layout;
6212                 if (!lo || list_empty(&lo->plh_segs)) {
6213                         spin_unlock(&inode->i_lock);
6214                         /* If the open stateid was bad, then recover it. */
6215                         state = lgp->args.ctx->state;
6216                 } else {
6217                         LIST_HEAD(head);
6218
6219                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6220                         spin_unlock(&inode->i_lock);
6221                         /* Mark the bad layout state as invalid, then
6222                          * retry using the open stateid. */
6223                         pnfs_free_lseg_list(&head);
6224                 }
6225         }
6226         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6227                 rpc_restart_call_prepare(task);
6228 out:
6229         dprintk("<-- %s\n", __func__);
6230 }
6231
6232 static size_t max_response_pages(struct nfs_server *server)
6233 {
6234         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6235         return nfs_page_array_len(0, max_resp_sz);
6236 }
6237
6238 static void nfs4_free_pages(struct page **pages, size_t size)
6239 {
6240         int i;
6241
6242         if (!pages)
6243                 return;
6244
6245         for (i = 0; i < size; i++) {
6246                 if (!pages[i])
6247                         break;
6248                 __free_page(pages[i]);
6249         }
6250         kfree(pages);
6251 }
6252
6253 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6254 {
6255         struct page **pages;
6256         int i;
6257
6258         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6259         if (!pages) {
6260                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6261                 return NULL;
6262         }
6263
6264         for (i = 0; i < size; i++) {
6265                 pages[i] = alloc_page(gfp_flags);
6266                 if (!pages[i]) {
6267                         dprintk("%s: failed to allocate page\n", __func__);
6268                         nfs4_free_pages(pages, size);
6269                         return NULL;
6270                 }
6271         }
6272
6273         return pages;
6274 }
6275
6276 static void nfs4_layoutget_release(void *calldata)
6277 {
6278         struct nfs4_layoutget *lgp = calldata;
6279         struct inode *inode = lgp->args.inode;
6280         struct nfs_server *server = NFS_SERVER(inode);
6281         size_t max_pages = max_response_pages(server);
6282
6283         dprintk("--> %s\n", __func__);
6284         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6285         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6286         put_nfs_open_context(lgp->args.ctx);
6287         kfree(calldata);
6288         dprintk("<-- %s\n", __func__);
6289 }
6290
6291 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6292         .rpc_call_prepare = nfs4_layoutget_prepare,
6293         .rpc_call_done = nfs4_layoutget_done,
6294         .rpc_release = nfs4_layoutget_release,
6295 };
6296
6297 struct pnfs_layout_segment *
6298 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6299 {
6300         struct inode *inode = lgp->args.inode;
6301         struct nfs_server *server = NFS_SERVER(inode);
6302         size_t max_pages = max_response_pages(server);
6303         struct rpc_task *task;
6304         struct rpc_message msg = {
6305                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6306                 .rpc_argp = &lgp->args,
6307                 .rpc_resp = &lgp->res,
6308         };
6309         struct rpc_task_setup task_setup_data = {
6310                 .rpc_client = server->client,
6311                 .rpc_message = &msg,
6312                 .callback_ops = &nfs4_layoutget_call_ops,
6313                 .callback_data = lgp,
6314                 .flags = RPC_TASK_ASYNC,
6315         };
6316         struct pnfs_layout_segment *lseg = NULL;
6317         int status = 0;
6318
6319         dprintk("--> %s\n", __func__);
6320
6321         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6322         if (!lgp->args.layout.pages) {
6323                 nfs4_layoutget_release(lgp);
6324                 return ERR_PTR(-ENOMEM);
6325         }
6326         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6327         lgp->args.timestamp = jiffies;
6328
6329         lgp->res.layoutp = &lgp->args.layout;
6330         lgp->res.seq_res.sr_slot = NULL;
6331         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6332
6333         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6334         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6335
6336         task = rpc_run_task(&task_setup_data);
6337         if (IS_ERR(task))
6338                 return ERR_CAST(task);
6339         status = nfs4_wait_for_completion_rpc_task(task);
6340         if (status == 0)
6341                 status = task->tk_status;
6342         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6343         if (status == 0 && lgp->res.layoutp->len)
6344                 lseg = pnfs_layout_process(lgp);
6345         rpc_put_task(task);
6346         dprintk("<-- %s status=%d\n", __func__, status);
6347         if (status)
6348                 return ERR_PTR(status);
6349         return lseg;
6350 }
6351
6352 static void
6353 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6354 {
6355         struct nfs4_layoutreturn *lrp = calldata;
6356
6357         dprintk("--> %s\n", __func__);
6358         nfs41_setup_sequence(lrp->clp->cl_session,
6359                         &lrp->args.seq_args,
6360                         &lrp->res.seq_res,
6361                         task);
6362 }
6363
6364 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6365 {
6366         struct nfs4_layoutreturn *lrp = calldata;
6367         struct nfs_server *server;
6368
6369         dprintk("--> %s\n", __func__);
6370
6371         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6372                 return;
6373
6374         server = NFS_SERVER(lrp->args.inode);
6375         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6376                 rpc_restart_call_prepare(task);
6377                 return;
6378         }
6379         dprintk("<-- %s\n", __func__);
6380 }
6381
6382 static void nfs4_layoutreturn_release(void *calldata)
6383 {
6384         struct nfs4_layoutreturn *lrp = calldata;
6385         struct pnfs_layout_hdr *lo = lrp->args.layout;
6386
6387         dprintk("--> %s\n", __func__);
6388         spin_lock(&lo->plh_inode->i_lock);
6389         if (lrp->res.lrs_present)
6390                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6391         lo->plh_block_lgets--;
6392         spin_unlock(&lo->plh_inode->i_lock);
6393         pnfs_put_layout_hdr(lrp->args.layout);
6394         kfree(calldata);
6395         dprintk("<-- %s\n", __func__);
6396 }
6397
6398 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6399         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6400         .rpc_call_done = nfs4_layoutreturn_done,
6401         .rpc_release = nfs4_layoutreturn_release,
6402 };
6403
6404 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6405 {
6406         struct rpc_task *task;
6407         struct rpc_message msg = {
6408                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6409                 .rpc_argp = &lrp->args,
6410                 .rpc_resp = &lrp->res,
6411         };
6412         struct rpc_task_setup task_setup_data = {
6413                 .rpc_client = lrp->clp->cl_rpcclient,
6414                 .rpc_message = &msg,
6415                 .callback_ops = &nfs4_layoutreturn_call_ops,
6416                 .callback_data = lrp,
6417         };
6418         int status;
6419
6420         dprintk("--> %s\n", __func__);
6421         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6422         task = rpc_run_task(&task_setup_data);
6423         if (IS_ERR(task))
6424                 return PTR_ERR(task);
6425         status = task->tk_status;
6426         dprintk("<-- %s status=%d\n", __func__, status);
6427         rpc_put_task(task);
6428         return status;
6429 }
6430
6431 /*
6432  * Retrieve the list of Data Server devices from the MDS.
6433  */
6434 static int _nfs4_getdevicelist(struct nfs_server *server,
6435                                     const struct nfs_fh *fh,
6436                                     struct pnfs_devicelist *devlist)
6437 {
6438         struct nfs4_getdevicelist_args args = {
6439                 .fh = fh,
6440                 .layoutclass = server->pnfs_curr_ld->id,
6441         };
6442         struct nfs4_getdevicelist_res res = {
6443                 .devlist = devlist,
6444         };
6445         struct rpc_message msg = {
6446                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6447                 .rpc_argp = &args,
6448                 .rpc_resp = &res,
6449         };
6450         int status;
6451
6452         dprintk("--> %s\n", __func__);
6453         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6454                                 &res.seq_res, 0);
6455         dprintk("<-- %s status=%d\n", __func__, status);
6456         return status;
6457 }
6458
6459 int nfs4_proc_getdevicelist(struct nfs_server *server,
6460                             const struct nfs_fh *fh,
6461                             struct pnfs_devicelist *devlist)
6462 {
6463         struct nfs4_exception exception = { };
6464         int err;
6465
6466         do {
6467                 err = nfs4_handle_exception(server,
6468                                 _nfs4_getdevicelist(server, fh, devlist),
6469                                 &exception);
6470         } while (exception.retry);
6471
6472         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6473                 err, devlist->num_devs);
6474
6475         return err;
6476 }
6477 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6478
6479 static int
6480 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6481 {
6482         struct nfs4_getdeviceinfo_args args = {
6483                 .pdev = pdev,
6484         };
6485         struct nfs4_getdeviceinfo_res res = {
6486                 .pdev = pdev,
6487         };
6488         struct rpc_message msg = {
6489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6490                 .rpc_argp = &args,
6491                 .rpc_resp = &res,
6492         };
6493         int status;
6494
6495         dprintk("--> %s\n", __func__);
6496         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6497         dprintk("<-- %s status=%d\n", __func__, status);
6498
6499         return status;
6500 }
6501
6502 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6503 {
6504         struct nfs4_exception exception = { };
6505         int err;
6506
6507         do {
6508                 err = nfs4_handle_exception(server,
6509                                         _nfs4_proc_getdeviceinfo(server, pdev),
6510                                         &exception);
6511         } while (exception.retry);
6512         return err;
6513 }
6514 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6515
6516 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6517 {
6518         struct nfs4_layoutcommit_data *data = calldata;
6519         struct nfs_server *server = NFS_SERVER(data->args.inode);
6520         struct nfs4_session *session = nfs4_get_session(server);
6521
6522         nfs41_setup_sequence(session,
6523                         &data->args.seq_args,
6524                         &data->res.seq_res,
6525                         task);
6526 }
6527
6528 static void
6529 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6530 {
6531         struct nfs4_layoutcommit_data *data = calldata;
6532         struct nfs_server *server = NFS_SERVER(data->args.inode);
6533
6534         if (!nfs41_sequence_done(task, &data->res.seq_res))
6535                 return;
6536
6537         switch (task->tk_status) { /* Just ignore these failures */
6538         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6539         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6540         case -NFS4ERR_BADLAYOUT:     /* no layout */
6541         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6542                 task->tk_status = 0;
6543                 break;
6544         case 0:
6545                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6546                                                    data->res.fattr);
6547                 break;
6548         default:
6549                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6550                         rpc_restart_call_prepare(task);
6551                         return;
6552                 }
6553         }
6554 }
6555
6556 static void nfs4_layoutcommit_release(void *calldata)
6557 {
6558         struct nfs4_layoutcommit_data *data = calldata;
6559
6560         pnfs_cleanup_layoutcommit(data);
6561         put_rpccred(data->cred);
6562         kfree(data);
6563 }
6564
6565 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6566         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6567         .rpc_call_done = nfs4_layoutcommit_done,
6568         .rpc_release = nfs4_layoutcommit_release,
6569 };
6570
6571 int
6572 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6573 {
6574         struct rpc_message msg = {
6575                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6576                 .rpc_argp = &data->args,
6577                 .rpc_resp = &data->res,
6578                 .rpc_cred = data->cred,
6579         };
6580         struct rpc_task_setup task_setup_data = {
6581                 .task = &data->task,
6582                 .rpc_client = NFS_CLIENT(data->args.inode),
6583                 .rpc_message = &msg,
6584                 .callback_ops = &nfs4_layoutcommit_ops,
6585                 .callback_data = data,
6586                 .flags = RPC_TASK_ASYNC,
6587         };
6588         struct rpc_task *task;
6589         int status = 0;
6590
6591         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6592                 "lbw: %llu inode %lu\n",
6593                 data->task.tk_pid, sync,
6594                 data->args.lastbytewritten,
6595                 data->args.inode->i_ino);
6596
6597         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6598         task = rpc_run_task(&task_setup_data);
6599         if (IS_ERR(task))
6600                 return PTR_ERR(task);
6601         if (sync == false)
6602                 goto out;
6603         status = nfs4_wait_for_completion_rpc_task(task);
6604         if (status != 0)
6605                 goto out;
6606         status = task->tk_status;
6607 out:
6608         dprintk("%s: status %d\n", __func__, status);
6609         rpc_put_task(task);
6610         return status;
6611 }
6612
6613 static int
6614 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6615                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6616 {
6617         struct nfs41_secinfo_no_name_args args = {
6618                 .style = SECINFO_STYLE_CURRENT_FH,
6619         };
6620         struct nfs4_secinfo_res res = {
6621                 .flavors = flavors,
6622         };
6623         struct rpc_message msg = {
6624                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6625                 .rpc_argp = &args,
6626                 .rpc_resp = &res,
6627         };
6628         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6629 }
6630
6631 static int
6632 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6633                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6634 {
6635         struct nfs4_exception exception = { };
6636         int err;
6637         do {
6638                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6639                 switch (err) {
6640                 case 0:
6641                 case -NFS4ERR_WRONGSEC:
6642                 case -NFS4ERR_NOTSUPP:
6643                         goto out;
6644                 default:
6645                         err = nfs4_handle_exception(server, err, &exception);
6646                 }
6647         } while (exception.retry);
6648 out:
6649         return err;
6650 }
6651
6652 static int
6653 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6654                     struct nfs_fsinfo *info)
6655 {
6656         int err;
6657         struct page *page;
6658         rpc_authflavor_t flavor;
6659         struct nfs4_secinfo_flavors *flavors;
6660
6661         page = alloc_page(GFP_KERNEL);
6662         if (!page) {
6663                 err = -ENOMEM;
6664                 goto out;
6665         }
6666
6667         flavors = page_address(page);
6668         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6669
6670         /*
6671          * Fall back on "guess and check" method if
6672          * the server doesn't support SECINFO_NO_NAME
6673          */
6674         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6675                 err = nfs4_find_root_sec(server, fhandle, info);
6676                 goto out_freepage;
6677         }
6678         if (err)
6679                 goto out_freepage;
6680
6681         flavor = nfs_find_best_sec(flavors);
6682         if (err == 0)
6683                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6684
6685 out_freepage:
6686         put_page(page);
6687         if (err == -EACCES)
6688                 return -EPERM;
6689 out:
6690         return err;
6691 }
6692
6693 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6694 {
6695         int status;
6696         struct nfs41_test_stateid_args args = {
6697                 .stateid = stateid,
6698         };
6699         struct nfs41_test_stateid_res res;
6700         struct rpc_message msg = {
6701                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6702                 .rpc_argp = &args,
6703                 .rpc_resp = &res,
6704         };
6705
6706         dprintk("NFS call  test_stateid %p\n", stateid);
6707         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6708         nfs4_set_sequence_privileged(&args.seq_args);
6709         status = nfs4_call_sync_sequence(server->client, server, &msg,
6710                         &args.seq_args, &res.seq_res);
6711         if (status != NFS_OK) {
6712                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6713                 return status;
6714         }
6715         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6716         return -res.status;
6717 }
6718
6719 /**
6720  * nfs41_test_stateid - perform a TEST_STATEID operation
6721  *
6722  * @server: server / transport on which to perform the operation
6723  * @stateid: state ID to test
6724  *
6725  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6726  * Otherwise a negative NFS4ERR value is returned if the operation
6727  * failed or the state ID is not currently valid.
6728  */
6729 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6730 {
6731         struct nfs4_exception exception = { };
6732         int err;
6733         do {
6734                 err = _nfs41_test_stateid(server, stateid);
6735                 if (err != -NFS4ERR_DELAY)
6736                         break;
6737                 nfs4_handle_exception(server, err, &exception);
6738         } while (exception.retry);
6739         return err;
6740 }
6741
6742 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6743 {
6744         struct nfs41_free_stateid_args args = {
6745                 .stateid = stateid,
6746         };
6747         struct nfs41_free_stateid_res res;
6748         struct rpc_message msg = {
6749                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6750                 .rpc_argp = &args,
6751                 .rpc_resp = &res,
6752         };
6753         int status;
6754
6755         dprintk("NFS call  free_stateid %p\n", stateid);
6756         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6757         nfs4_set_sequence_privileged(&args.seq_args);
6758         status = nfs4_call_sync_sequence(server->client, server, &msg,
6759                         &args.seq_args, &res.seq_res);
6760         dprintk("NFS reply free_stateid: %d\n", status);
6761         return status;
6762 }
6763
6764 /**
6765  * nfs41_free_stateid - perform a FREE_STATEID operation
6766  *
6767  * @server: server / transport on which to perform the operation
6768  * @stateid: state ID to release
6769  *
6770  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6771  * negative NFS4ERR value is returned.
6772  */
6773 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6774 {
6775         struct nfs4_exception exception = { };
6776         int err;
6777         do {
6778                 err = _nfs4_free_stateid(server, stateid);
6779                 if (err != -NFS4ERR_DELAY)
6780                         break;
6781                 nfs4_handle_exception(server, err, &exception);
6782         } while (exception.retry);
6783         return err;
6784 }
6785
6786 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6787                 const nfs4_stateid *s2)
6788 {
6789         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6790                 return false;
6791
6792         if (s1->seqid == s2->seqid)
6793                 return true;
6794         if (s1->seqid == 0 || s2->seqid == 0)
6795                 return true;
6796
6797         return false;
6798 }
6799
6800 #endif /* CONFIG_NFS_V4_1 */
6801
6802 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6803                 const nfs4_stateid *s2)
6804 {
6805         return nfs4_stateid_match(s1, s2);
6806 }
6807
6808
6809 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6810         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6811         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6812         .recover_open   = nfs4_open_reclaim,
6813         .recover_lock   = nfs4_lock_reclaim,
6814         .establish_clid = nfs4_init_clientid,
6815         .get_clid_cred  = nfs4_get_setclientid_cred,
6816         .detect_trunking = nfs40_discover_server_trunking,
6817 };
6818
6819 #if defined(CONFIG_NFS_V4_1)
6820 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6821         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6822         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6823         .recover_open   = nfs4_open_reclaim,
6824         .recover_lock   = nfs4_lock_reclaim,
6825         .establish_clid = nfs41_init_clientid,
6826         .get_clid_cred  = nfs4_get_exchange_id_cred,
6827         .reclaim_complete = nfs41_proc_reclaim_complete,
6828         .detect_trunking = nfs41_discover_server_trunking,
6829 };
6830 #endif /* CONFIG_NFS_V4_1 */
6831
6832 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6833         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6834         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6835         .recover_open   = nfs4_open_expired,
6836         .recover_lock   = nfs4_lock_expired,
6837         .establish_clid = nfs4_init_clientid,
6838         .get_clid_cred  = nfs4_get_setclientid_cred,
6839 };
6840
6841 #if defined(CONFIG_NFS_V4_1)
6842 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6843         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6844         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6845         .recover_open   = nfs41_open_expired,
6846         .recover_lock   = nfs41_lock_expired,
6847         .establish_clid = nfs41_init_clientid,
6848         .get_clid_cred  = nfs4_get_exchange_id_cred,
6849 };
6850 #endif /* CONFIG_NFS_V4_1 */
6851
6852 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6853         .sched_state_renewal = nfs4_proc_async_renew,
6854         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6855         .renew_lease = nfs4_proc_renew,
6856 };
6857
6858 #if defined(CONFIG_NFS_V4_1)
6859 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6860         .sched_state_renewal = nfs41_proc_async_sequence,
6861         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6862         .renew_lease = nfs4_proc_sequence,
6863 };
6864 #endif
6865
6866 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6867         .minor_version = 0,
6868         .init_caps = NFS_CAP_READDIRPLUS
6869                 | NFS_CAP_ATOMIC_OPEN
6870                 | NFS_CAP_CHANGE_ATTR
6871                 | NFS_CAP_POSIX_LOCK,
6872         .call_sync = _nfs4_call_sync,
6873         .match_stateid = nfs4_match_stateid,
6874         .find_root_sec = nfs4_find_root_sec,
6875         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6876         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6877         .state_renewal_ops = &nfs40_state_renewal_ops,
6878 };
6879
6880 #if defined(CONFIG_NFS_V4_1)
6881 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6882         .minor_version = 1,
6883         .init_caps = NFS_CAP_READDIRPLUS
6884                 | NFS_CAP_ATOMIC_OPEN
6885                 | NFS_CAP_CHANGE_ATTR
6886                 | NFS_CAP_POSIX_LOCK
6887                 | NFS_CAP_STATEID_NFSV41
6888                 | NFS_CAP_ATOMIC_OPEN_V1,
6889         .call_sync = nfs4_call_sync_sequence,
6890         .match_stateid = nfs41_match_stateid,
6891         .find_root_sec = nfs41_find_root_sec,
6892         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6893         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6894         .state_renewal_ops = &nfs41_state_renewal_ops,
6895 };
6896 #endif
6897
6898 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6899         [0] = &nfs_v4_0_minor_ops,
6900 #if defined(CONFIG_NFS_V4_1)
6901         [1] = &nfs_v4_1_minor_ops,
6902 #endif
6903 };
6904
6905 const struct inode_operations nfs4_dir_inode_operations = {
6906         .create         = nfs_create,
6907         .lookup         = nfs_lookup,
6908         .atomic_open    = nfs_atomic_open,
6909         .link           = nfs_link,
6910         .unlink         = nfs_unlink,
6911         .symlink        = nfs_symlink,
6912         .mkdir          = nfs_mkdir,
6913         .rmdir          = nfs_rmdir,
6914         .mknod          = nfs_mknod,
6915         .rename         = nfs_rename,
6916         .permission     = nfs_permission,
6917         .getattr        = nfs_getattr,
6918         .setattr        = nfs_setattr,
6919         .getxattr       = generic_getxattr,
6920         .setxattr       = generic_setxattr,
6921         .listxattr      = generic_listxattr,
6922         .removexattr    = generic_removexattr,
6923 };
6924
6925 static const struct inode_operations nfs4_file_inode_operations = {
6926         .permission     = nfs_permission,
6927         .getattr        = nfs_getattr,
6928         .setattr        = nfs_setattr,
6929         .getxattr       = generic_getxattr,
6930         .setxattr       = generic_setxattr,
6931         .listxattr      = generic_listxattr,
6932         .removexattr    = generic_removexattr,
6933 };
6934
6935 const struct nfs_rpc_ops nfs_v4_clientops = {
6936         .version        = 4,                    /* protocol version */
6937         .dentry_ops     = &nfs4_dentry_operations,
6938         .dir_inode_ops  = &nfs4_dir_inode_operations,
6939         .file_inode_ops = &nfs4_file_inode_operations,
6940         .file_ops       = &nfs4_file_operations,
6941         .getroot        = nfs4_proc_get_root,
6942         .submount       = nfs4_submount,
6943         .try_mount      = nfs4_try_mount,
6944         .getattr        = nfs4_proc_getattr,
6945         .setattr        = nfs4_proc_setattr,
6946         .lookup         = nfs4_proc_lookup,
6947         .access         = nfs4_proc_access,
6948         .readlink       = nfs4_proc_readlink,
6949         .create         = nfs4_proc_create,
6950         .remove         = nfs4_proc_remove,
6951         .unlink_setup   = nfs4_proc_unlink_setup,
6952         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6953         .unlink_done    = nfs4_proc_unlink_done,
6954         .rename         = nfs4_proc_rename,
6955         .rename_setup   = nfs4_proc_rename_setup,
6956         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6957         .rename_done    = nfs4_proc_rename_done,
6958         .link           = nfs4_proc_link,
6959         .symlink        = nfs4_proc_symlink,
6960         .mkdir          = nfs4_proc_mkdir,
6961         .rmdir          = nfs4_proc_remove,
6962         .readdir        = nfs4_proc_readdir,
6963         .mknod          = nfs4_proc_mknod,
6964         .statfs         = nfs4_proc_statfs,
6965         .fsinfo         = nfs4_proc_fsinfo,
6966         .pathconf       = nfs4_proc_pathconf,
6967         .set_capabilities = nfs4_server_capabilities,
6968         .decode_dirent  = nfs4_decode_dirent,
6969         .read_setup     = nfs4_proc_read_setup,
6970         .read_pageio_init = pnfs_pageio_init_read,
6971         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6972         .read_done      = nfs4_read_done,
6973         .write_setup    = nfs4_proc_write_setup,
6974         .write_pageio_init = pnfs_pageio_init_write,
6975         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6976         .write_done     = nfs4_write_done,
6977         .commit_setup   = nfs4_proc_commit_setup,
6978         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6979         .commit_done    = nfs4_commit_done,
6980         .lock           = nfs4_proc_lock,
6981         .clear_acl_cache = nfs4_zap_acl_attr,
6982         .close_context  = nfs4_close_context,
6983         .open_context   = nfs4_atomic_open,
6984         .have_delegation = nfs4_have_delegation,
6985         .return_delegation = nfs4_inode_return_delegation,
6986         .alloc_client   = nfs4_alloc_client,
6987         .init_client    = nfs4_init_client,
6988         .free_client    = nfs4_free_client,
6989         .create_server  = nfs4_create_server,
6990         .clone_server   = nfs_clone_server,
6991 };
6992
6993 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6994         .prefix = XATTR_NAME_NFSV4_ACL,
6995         .list   = nfs4_xattr_list_nfs4_acl,
6996         .get    = nfs4_xattr_get_nfs4_acl,
6997         .set    = nfs4_xattr_set_nfs4_acl,
6998 };
6999
7000 const struct xattr_handler *nfs4_xattr_handlers[] = {
7001         &nfs4_xattr_nfs4_acl_handler,
7002         NULL
7003 };
7004
7005 /*
7006  * Local variables:
7007  *  c-basic-offset: 8
7008  * End:
7009  */