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 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1383 {
1384         switch (err) {
1385                 default:
1386                         printk(KERN_ERR "NFS: %s: unhandled error "
1387                                         "%d.\n", __func__, err);
1388                 case 0:
1389                 case -ENOENT:
1390                 case -ESTALE:
1391                         break;
1392                 case -NFS4ERR_BADSESSION:
1393                 case -NFS4ERR_BADSLOT:
1394                 case -NFS4ERR_BAD_HIGH_SLOT:
1395                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1396                 case -NFS4ERR_DEADSESSION:
1397                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1398                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1399                         return -EAGAIN;
1400                 case -NFS4ERR_STALE_CLIENTID:
1401                 case -NFS4ERR_STALE_STATEID:
1402                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1403                 case -NFS4ERR_EXPIRED:
1404                         /* Don't recall a delegation if it was lost */
1405                         nfs4_schedule_lease_recovery(server->nfs_client);
1406                         return -EAGAIN;
1407                 case -NFS4ERR_DELEG_REVOKED:
1408                 case -NFS4ERR_ADMIN_REVOKED:
1409                 case -NFS4ERR_BAD_STATEID:
1410                 case -NFS4ERR_OPENMODE:
1411                         nfs_inode_find_state_and_recover(state->inode,
1412                                         stateid);
1413                         nfs4_schedule_stateid_recovery(server, state);
1414                         return 0;
1415                 case -NFS4ERR_DELAY:
1416                 case -NFS4ERR_GRACE:
1417                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1418                         ssleep(1);
1419                         return -EAGAIN;
1420                 case -ENOMEM:
1421                 case -NFS4ERR_DENIED:
1422                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1423                         return 0;
1424         }
1425         return err;
1426 }
1427
1428 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1429 {
1430         struct nfs_server *server = NFS_SERVER(state->inode);
1431         struct nfs4_opendata *opendata;
1432         int err;
1433
1434         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1435                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1436         if (IS_ERR(opendata))
1437                 return PTR_ERR(opendata);
1438         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1439         err = nfs4_open_recover(opendata, state);
1440         nfs4_opendata_put(opendata);
1441         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1442 }
1443
1444 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1445 {
1446         struct nfs4_opendata *data = calldata;
1447
1448         data->rpc_status = task->tk_status;
1449         if (data->rpc_status == 0) {
1450                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1451                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1452                 renew_lease(data->o_res.server, data->timestamp);
1453                 data->rpc_done = 1;
1454         }
1455 }
1456
1457 static void nfs4_open_confirm_release(void *calldata)
1458 {
1459         struct nfs4_opendata *data = calldata;
1460         struct nfs4_state *state = NULL;
1461
1462         /* If this request hasn't been cancelled, do nothing */
1463         if (data->cancelled == 0)
1464                 goto out_free;
1465         /* In case of error, no cleanup! */
1466         if (!data->rpc_done)
1467                 goto out_free;
1468         state = nfs4_opendata_to_nfs4_state(data);
1469         if (!IS_ERR(state))
1470                 nfs4_close_state(state, data->o_arg.fmode);
1471 out_free:
1472         nfs4_opendata_put(data);
1473 }
1474
1475 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1476         .rpc_call_done = nfs4_open_confirm_done,
1477         .rpc_release = nfs4_open_confirm_release,
1478 };
1479
1480 /*
1481  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1482  */
1483 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1484 {
1485         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1486         struct rpc_task *task;
1487         struct  rpc_message msg = {
1488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1489                 .rpc_argp = &data->c_arg,
1490                 .rpc_resp = &data->c_res,
1491                 .rpc_cred = data->owner->so_cred,
1492         };
1493         struct rpc_task_setup task_setup_data = {
1494                 .rpc_client = server->client,
1495                 .rpc_message = &msg,
1496                 .callback_ops = &nfs4_open_confirm_ops,
1497                 .callback_data = data,
1498                 .workqueue = nfsiod_workqueue,
1499                 .flags = RPC_TASK_ASYNC,
1500         };
1501         int status;
1502
1503         kref_get(&data->kref);
1504         data->rpc_done = 0;
1505         data->rpc_status = 0;
1506         data->timestamp = jiffies;
1507         task = rpc_run_task(&task_setup_data);
1508         if (IS_ERR(task))
1509                 return PTR_ERR(task);
1510         status = nfs4_wait_for_completion_rpc_task(task);
1511         if (status != 0) {
1512                 data->cancelled = 1;
1513                 smp_wmb();
1514         } else
1515                 status = data->rpc_status;
1516         rpc_put_task(task);
1517         return status;
1518 }
1519
1520 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1521 {
1522         struct nfs4_opendata *data = calldata;
1523         struct nfs4_state_owner *sp = data->owner;
1524
1525         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1526                 goto out_wait;
1527         /*
1528          * Check if we still need to send an OPEN call, or if we can use
1529          * a delegation instead.
1530          */
1531         if (data->state != NULL) {
1532                 struct nfs_delegation *delegation;
1533
1534                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1535                         goto out_no_action;
1536                 rcu_read_lock();
1537                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1538                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1539                     can_open_delegated(delegation, data->o_arg.fmode))
1540                         goto unlock_no_action;
1541                 rcu_read_unlock();
1542         }
1543         /* Update client id. */
1544         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1545         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1546                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1547                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1548                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1549         }
1550         data->timestamp = jiffies;
1551         if (nfs4_setup_sequence(data->o_arg.server,
1552                                 &data->o_arg.seq_args,
1553                                 &data->o_res.seq_res,
1554                                 task) != 0)
1555                 nfs_release_seqid(data->o_arg.seqid);
1556         return;
1557 unlock_no_action:
1558         rcu_read_unlock();
1559 out_no_action:
1560         task->tk_action = NULL;
1561 out_wait:
1562         nfs4_sequence_done(task, &data->o_res.seq_res);
1563 }
1564
1565 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1566 {
1567         struct nfs4_opendata *data = calldata;
1568
1569         data->rpc_status = task->tk_status;
1570
1571         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1572                 return;
1573
1574         if (task->tk_status == 0) {
1575                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1576                         switch (data->o_res.f_attr->mode & S_IFMT) {
1577                         case S_IFREG:
1578                                 break;
1579                         case S_IFLNK:
1580                                 data->rpc_status = -ELOOP;
1581                                 break;
1582                         case S_IFDIR:
1583                                 data->rpc_status = -EISDIR;
1584                                 break;
1585                         default:
1586                                 data->rpc_status = -ENOTDIR;
1587                         }
1588                 }
1589                 renew_lease(data->o_res.server, data->timestamp);
1590                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1591                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1592         }
1593         data->rpc_done = 1;
1594 }
1595
1596 static void nfs4_open_release(void *calldata)
1597 {
1598         struct nfs4_opendata *data = calldata;
1599         struct nfs4_state *state = NULL;
1600
1601         /* If this request hasn't been cancelled, do nothing */
1602         if (data->cancelled == 0)
1603                 goto out_free;
1604         /* In case of error, no cleanup! */
1605         if (data->rpc_status != 0 || !data->rpc_done)
1606                 goto out_free;
1607         /* In case we need an open_confirm, no cleanup! */
1608         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1609                 goto out_free;
1610         state = nfs4_opendata_to_nfs4_state(data);
1611         if (!IS_ERR(state))
1612                 nfs4_close_state(state, data->o_arg.fmode);
1613 out_free:
1614         nfs4_opendata_put(data);
1615 }
1616
1617 static const struct rpc_call_ops nfs4_open_ops = {
1618         .rpc_call_prepare = nfs4_open_prepare,
1619         .rpc_call_done = nfs4_open_done,
1620         .rpc_release = nfs4_open_release,
1621 };
1622
1623 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1624 {
1625         struct inode *dir = data->dir->d_inode;
1626         struct nfs_server *server = NFS_SERVER(dir);
1627         struct nfs_openargs *o_arg = &data->o_arg;
1628         struct nfs_openres *o_res = &data->o_res;
1629         struct rpc_task *task;
1630         struct rpc_message msg = {
1631                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1632                 .rpc_argp = o_arg,
1633                 .rpc_resp = o_res,
1634                 .rpc_cred = data->owner->so_cred,
1635         };
1636         struct rpc_task_setup task_setup_data = {
1637                 .rpc_client = server->client,
1638                 .rpc_message = &msg,
1639                 .callback_ops = &nfs4_open_ops,
1640                 .callback_data = data,
1641                 .workqueue = nfsiod_workqueue,
1642                 .flags = RPC_TASK_ASYNC,
1643         };
1644         int status;
1645
1646         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1647         kref_get(&data->kref);
1648         data->rpc_done = 0;
1649         data->rpc_status = 0;
1650         data->cancelled = 0;
1651         if (isrecover)
1652                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1653         task = rpc_run_task(&task_setup_data);
1654         if (IS_ERR(task))
1655                 return PTR_ERR(task);
1656         status = nfs4_wait_for_completion_rpc_task(task);
1657         if (status != 0) {
1658                 data->cancelled = 1;
1659                 smp_wmb();
1660         } else
1661                 status = data->rpc_status;
1662         rpc_put_task(task);
1663
1664         return status;
1665 }
1666
1667 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1668 {
1669         struct inode *dir = data->dir->d_inode;
1670         struct nfs_openres *o_res = &data->o_res;
1671         int status;
1672
1673         status = nfs4_run_open_task(data, 1);
1674         if (status != 0 || !data->rpc_done)
1675                 return status;
1676
1677         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1678
1679         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1680                 status = _nfs4_proc_open_confirm(data);
1681                 if (status != 0)
1682                         return status;
1683         }
1684
1685         return status;
1686 }
1687
1688 static int nfs4_opendata_access(struct rpc_cred *cred,
1689                                 struct nfs4_opendata *opendata,
1690                                 struct nfs4_state *state, fmode_t fmode,
1691                                 int openflags)
1692 {
1693         struct nfs_access_entry cache;
1694         u32 mask;
1695
1696         /* access call failed or for some reason the server doesn't
1697          * support any access modes -- defer access call until later */
1698         if (opendata->o_res.access_supported == 0)
1699                 return 0;
1700
1701         mask = 0;
1702         /* don't check MAY_WRITE - a newly created file may not have
1703          * write mode bits, but POSIX allows the creating process to write.
1704          * use openflags to check for exec, because fmode won't
1705          * always have FMODE_EXEC set when file open for exec. */
1706         if (openflags & __FMODE_EXEC) {
1707                 /* ONLY check for exec rights */
1708                 mask = MAY_EXEC;
1709         } else if (fmode & FMODE_READ)
1710                 mask = MAY_READ;
1711
1712         cache.cred = cred;
1713         cache.jiffies = jiffies;
1714         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1715         nfs_access_add_cache(state->inode, &cache);
1716
1717         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1718                 return 0;
1719
1720         /* even though OPEN succeeded, access is denied. Close the file */
1721         nfs4_close_state(state, fmode);
1722         return -EACCES;
1723 }
1724
1725 /*
1726  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1727  */
1728 static int _nfs4_proc_open(struct nfs4_opendata *data)
1729 {
1730         struct inode *dir = data->dir->d_inode;
1731         struct nfs_server *server = NFS_SERVER(dir);
1732         struct nfs_openargs *o_arg = &data->o_arg;
1733         struct nfs_openres *o_res = &data->o_res;
1734         int status;
1735
1736         status = nfs4_run_open_task(data, 0);
1737         if (!data->rpc_done)
1738                 return status;
1739         if (status != 0) {
1740                 if (status == -NFS4ERR_BADNAME &&
1741                                 !(o_arg->open_flags & O_CREAT))
1742                         return -ENOENT;
1743                 return status;
1744         }
1745
1746         nfs_fattr_map_and_free_names(server, &data->f_attr);
1747
1748         if (o_arg->open_flags & O_CREAT)
1749                 update_changeattr(dir, &o_res->cinfo);
1750         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1751                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1752         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1753                 status = _nfs4_proc_open_confirm(data);
1754                 if (status != 0)
1755                         return status;
1756         }
1757         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1758                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1759         return 0;
1760 }
1761
1762 static int nfs4_recover_expired_lease(struct nfs_server *server)
1763 {
1764         return nfs4_client_recover_expired_lease(server->nfs_client);
1765 }
1766
1767 /*
1768  * OPEN_EXPIRED:
1769  *      reclaim state on the server after a network partition.
1770  *      Assumes caller holds the appropriate lock
1771  */
1772 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1773 {
1774         struct nfs4_opendata *opendata;
1775         int ret;
1776
1777         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1778                         NFS4_OPEN_CLAIM_FH);
1779         if (IS_ERR(opendata))
1780                 return PTR_ERR(opendata);
1781         ret = nfs4_open_recover(opendata, state);
1782         if (ret == -ESTALE)
1783                 d_drop(ctx->dentry);
1784         nfs4_opendata_put(opendata);
1785         return ret;
1786 }
1787
1788 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1789 {
1790         struct nfs_server *server = NFS_SERVER(state->inode);
1791         struct nfs4_exception exception = { };
1792         int err;
1793
1794         do {
1795                 err = _nfs4_open_expired(ctx, state);
1796                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1797                         continue;
1798                 switch (err) {
1799                 default:
1800                         goto out;
1801                 case -NFS4ERR_GRACE:
1802                 case -NFS4ERR_DELAY:
1803                         nfs4_handle_exception(server, err, &exception);
1804                         err = 0;
1805                 }
1806         } while (exception.retry);
1807 out:
1808         return err;
1809 }
1810
1811 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1812 {
1813         struct nfs_open_context *ctx;
1814         int ret;
1815
1816         ctx = nfs4_state_find_open_context(state);
1817         if (IS_ERR(ctx))
1818                 return -EAGAIN;
1819         ret = nfs4_do_open_expired(ctx, state);
1820         put_nfs_open_context(ctx);
1821         return ret;
1822 }
1823
1824 #if defined(CONFIG_NFS_V4_1)
1825 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1826 {
1827         struct nfs_server *server = NFS_SERVER(state->inode);
1828         nfs4_stateid *stateid = &state->stateid;
1829         int status;
1830
1831         /* If a state reset has been done, test_stateid is unneeded */
1832         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1833                 return;
1834
1835         status = nfs41_test_stateid(server, stateid);
1836         if (status != NFS_OK) {
1837                 /* Free the stateid unless the server explicitly
1838                  * informs us the stateid is unrecognized. */
1839                 if (status != -NFS4ERR_BAD_STATEID)
1840                         nfs41_free_stateid(server, stateid);
1841                 nfs_remove_bad_delegation(state->inode);
1842
1843                 write_seqlock(&state->seqlock);
1844                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1845                 write_sequnlock(&state->seqlock);
1846                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1847         }
1848 }
1849
1850 /**
1851  * nfs41_check_open_stateid - possibly free an open stateid
1852  *
1853  * @state: NFSv4 state for an inode
1854  *
1855  * Returns NFS_OK if recovery for this stateid is now finished.
1856  * Otherwise a negative NFS4ERR value is returned.
1857  */
1858 static int nfs41_check_open_stateid(struct nfs4_state *state)
1859 {
1860         struct nfs_server *server = NFS_SERVER(state->inode);
1861         nfs4_stateid *stateid = &state->open_stateid;
1862         int status;
1863
1864         /* If a state reset has been done, test_stateid is unneeded */
1865         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1866             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1867             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1868                 return -NFS4ERR_BAD_STATEID;
1869
1870         status = nfs41_test_stateid(server, stateid);
1871         if (status != NFS_OK) {
1872                 /* Free the stateid unless the server explicitly
1873                  * informs us the stateid is unrecognized. */
1874                 if (status != -NFS4ERR_BAD_STATEID)
1875                         nfs41_free_stateid(server, stateid);
1876
1877                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1878                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1879                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1880         }
1881         return status;
1882 }
1883
1884 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1885 {
1886         int status;
1887
1888         nfs41_clear_delegation_stateid(state);
1889         status = nfs41_check_open_stateid(state);
1890         if (status != NFS_OK)
1891                 status = nfs4_open_expired(sp, state);
1892         return status;
1893 }
1894 #endif
1895
1896 /*
1897  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1898  * fields corresponding to attributes that were used to store the verifier.
1899  * Make sure we clobber those fields in the later setattr call
1900  */
1901 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1902 {
1903         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1904             !(sattr->ia_valid & ATTR_ATIME_SET))
1905                 sattr->ia_valid |= ATTR_ATIME;
1906
1907         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1908             !(sattr->ia_valid & ATTR_MTIME_SET))
1909                 sattr->ia_valid |= ATTR_MTIME;
1910 }
1911
1912 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1913                 fmode_t fmode,
1914                 int flags,
1915                 struct nfs4_state **res)
1916 {
1917         struct nfs4_state_owner *sp = opendata->owner;
1918         struct nfs_server *server = sp->so_server;
1919         struct nfs4_state *state;
1920         unsigned int seq;
1921         int ret;
1922
1923         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1924
1925         ret = _nfs4_proc_open(opendata);
1926         if (ret != 0)
1927                 goto out;
1928
1929         state = nfs4_opendata_to_nfs4_state(opendata);
1930         ret = PTR_ERR(state);
1931         if (IS_ERR(state))
1932                 goto out;
1933         if (server->caps & NFS_CAP_POSIX_LOCK)
1934                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1935
1936         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1937         if (ret != 0)
1938                 goto out;
1939
1940         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
1941                 nfs4_schedule_stateid_recovery(server, state);
1942         *res = state;
1943 out:
1944         return ret;
1945 }
1946
1947 /*
1948  * Returns a referenced nfs4_state
1949  */
1950 static int _nfs4_do_open(struct inode *dir,
1951                         struct dentry *dentry,
1952                         fmode_t fmode,
1953                         int flags,
1954                         struct iattr *sattr,
1955                         struct rpc_cred *cred,
1956                         struct nfs4_state **res,
1957                         struct nfs4_threshold **ctx_th)
1958 {
1959         struct nfs4_state_owner  *sp;
1960         struct nfs4_state     *state = NULL;
1961         struct nfs_server       *server = NFS_SERVER(dir);
1962         struct nfs4_opendata *opendata;
1963         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
1964         int status;
1965
1966         /* Protect against reboot recovery conflicts */
1967         status = -ENOMEM;
1968         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1969         if (sp == NULL) {
1970                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1971                 goto out_err;
1972         }
1973         status = nfs4_recover_expired_lease(server);
1974         if (status != 0)
1975                 goto err_put_state_owner;
1976         if (dentry->d_inode != NULL)
1977                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1978         status = -ENOMEM;
1979         if (dentry->d_inode)
1980                 claim = NFS4_OPEN_CLAIM_FH;
1981         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
1982                         claim, GFP_KERNEL);
1983         if (opendata == NULL)
1984                 goto err_put_state_owner;
1985
1986         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1987                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1988                 if (!opendata->f_attr.mdsthreshold)
1989                         goto err_opendata_put;
1990                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1991         }
1992         if (dentry->d_inode != NULL)
1993                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1994
1995         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
1996         if (status != 0)
1997                 goto err_opendata_put;
1998
1999         if (opendata->o_arg.open_flags & O_EXCL) {
2000                 nfs4_exclusive_attrset(opendata, sattr);
2001
2002                 nfs_fattr_init(opendata->o_res.f_attr);
2003                 status = nfs4_do_setattr(state->inode, cred,
2004                                 opendata->o_res.f_attr, sattr,
2005                                 state);
2006                 if (status == 0)
2007                         nfs_setattr_update_inode(state->inode, sattr);
2008                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2009         }
2010
2011         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2012                 *ctx_th = opendata->f_attr.mdsthreshold;
2013         else
2014                 kfree(opendata->f_attr.mdsthreshold);
2015         opendata->f_attr.mdsthreshold = NULL;
2016
2017         nfs4_opendata_put(opendata);
2018         nfs4_put_state_owner(sp);
2019         *res = state;
2020         return 0;
2021 err_opendata_put:
2022         kfree(opendata->f_attr.mdsthreshold);
2023         nfs4_opendata_put(opendata);
2024 err_put_state_owner:
2025         nfs4_put_state_owner(sp);
2026 out_err:
2027         *res = NULL;
2028         return status;
2029 }
2030
2031
2032 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2033                                         struct dentry *dentry,
2034                                         fmode_t fmode,
2035                                         int flags,
2036                                         struct iattr *sattr,
2037                                         struct rpc_cred *cred,
2038                                         struct nfs4_threshold **ctx_th)
2039 {
2040         struct nfs_server *server = NFS_SERVER(dir);
2041         struct nfs4_exception exception = { };
2042         struct nfs4_state *res;
2043         int status;
2044
2045         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2046         do {
2047                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2048                                        &res, ctx_th);
2049                 if (status == 0)
2050                         break;
2051                 /* NOTE: BAD_SEQID means the server and client disagree about the
2052                  * book-keeping w.r.t. state-changing operations
2053                  * (OPEN/CLOSE/LOCK/LOCKU...)
2054                  * It is actually a sign of a bug on the client or on the server.
2055                  *
2056                  * If we receive a BAD_SEQID error in the particular case of
2057                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2058                  * have unhashed the old state_owner for us, and that we can
2059                  * therefore safely retry using a new one. We should still warn
2060                  * the user though...
2061                  */
2062                 if (status == -NFS4ERR_BAD_SEQID) {
2063                         pr_warn_ratelimited("NFS: v4 server %s "
2064                                         " returned a bad sequence-id error!\n",
2065                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2066                         exception.retry = 1;
2067                         continue;
2068                 }
2069                 /*
2070                  * BAD_STATEID on OPEN means that the server cancelled our
2071                  * state before it received the OPEN_CONFIRM.
2072                  * Recover by retrying the request as per the discussion
2073                  * on Page 181 of RFC3530.
2074                  */
2075                 if (status == -NFS4ERR_BAD_STATEID) {
2076                         exception.retry = 1;
2077                         continue;
2078                 }
2079                 if (status == -EAGAIN) {
2080                         /* We must have found a delegation */
2081                         exception.retry = 1;
2082                         continue;
2083                 }
2084                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2085                         continue;
2086                 res = ERR_PTR(nfs4_handle_exception(server,
2087                                         status, &exception));
2088         } while (exception.retry);
2089         return res;
2090 }
2091
2092 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2093                             struct nfs_fattr *fattr, struct iattr *sattr,
2094                             struct nfs4_state *state)
2095 {
2096         struct nfs_server *server = NFS_SERVER(inode);
2097         struct nfs_setattrargs  arg = {
2098                 .fh             = NFS_FH(inode),
2099                 .iap            = sattr,
2100                 .server         = server,
2101                 .bitmask = server->attr_bitmask,
2102         };
2103         struct nfs_setattrres  res = {
2104                 .fattr          = fattr,
2105                 .server         = server,
2106         };
2107         struct rpc_message msg = {
2108                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2109                 .rpc_argp       = &arg,
2110                 .rpc_resp       = &res,
2111                 .rpc_cred       = cred,
2112         };
2113         unsigned long timestamp = jiffies;
2114         int status;
2115
2116         nfs_fattr_init(fattr);
2117
2118         if (state != NULL && nfs4_valid_open_stateid(state)) {
2119                 struct nfs_lockowner lockowner = {
2120                         .l_owner = current->files,
2121                         .l_pid = current->tgid,
2122                 };
2123                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2124                                 &lockowner);
2125         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2126                                 FMODE_WRITE)) {
2127                 /* Use that stateid */
2128         } else
2129                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2130
2131         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2132         if (status == 0 && state != NULL)
2133                 renew_lease(server, timestamp);
2134         return status;
2135 }
2136
2137 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2138                            struct nfs_fattr *fattr, struct iattr *sattr,
2139                            struct nfs4_state *state)
2140 {
2141         struct nfs_server *server = NFS_SERVER(inode);
2142         struct nfs4_exception exception = {
2143                 .state = state,
2144                 .inode = inode,
2145         };
2146         int err;
2147         do {
2148                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2149                 switch (err) {
2150                 case -NFS4ERR_OPENMODE:
2151                         if (state && !(state->state & FMODE_WRITE)) {
2152                                 err = -EBADF;
2153                                 if (sattr->ia_valid & ATTR_OPEN)
2154                                         err = -EACCES;
2155                                 goto out;
2156                         }
2157                 }
2158                 err = nfs4_handle_exception(server, err, &exception);
2159         } while (exception.retry);
2160 out:
2161         return err;
2162 }
2163
2164 struct nfs4_closedata {
2165         struct inode *inode;
2166         struct nfs4_state *state;
2167         struct nfs_closeargs arg;
2168         struct nfs_closeres res;
2169         struct nfs_fattr fattr;
2170         unsigned long timestamp;
2171         bool roc;
2172         u32 roc_barrier;
2173 };
2174
2175 static void nfs4_free_closedata(void *data)
2176 {
2177         struct nfs4_closedata *calldata = data;
2178         struct nfs4_state_owner *sp = calldata->state->owner;
2179         struct super_block *sb = calldata->state->inode->i_sb;
2180
2181         if (calldata->roc)
2182                 pnfs_roc_release(calldata->state->inode);
2183         nfs4_put_open_state(calldata->state);
2184         nfs_free_seqid(calldata->arg.seqid);
2185         nfs4_put_state_owner(sp);
2186         nfs_sb_deactive(sb);
2187         kfree(calldata);
2188 }
2189
2190 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2191                 fmode_t fmode)
2192 {
2193         spin_lock(&state->owner->so_lock);
2194         if (!(fmode & FMODE_READ))
2195                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2196         if (!(fmode & FMODE_WRITE))
2197                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2198         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2199         spin_unlock(&state->owner->so_lock);
2200 }
2201
2202 static void nfs4_close_done(struct rpc_task *task, void *data)
2203 {
2204         struct nfs4_closedata *calldata = data;
2205         struct nfs4_state *state = calldata->state;
2206         struct nfs_server *server = NFS_SERVER(calldata->inode);
2207
2208         dprintk("%s: begin!\n", __func__);
2209         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2210                 return;
2211         /* hmm. we are done with the inode, and in the process of freeing
2212          * the state_owner. we keep this around to process errors
2213          */
2214         switch (task->tk_status) {
2215                 case 0:
2216                         if (calldata->roc)
2217                                 pnfs_roc_set_barrier(state->inode,
2218                                                      calldata->roc_barrier);
2219                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2220                         renew_lease(server, calldata->timestamp);
2221                         nfs4_close_clear_stateid_flags(state,
2222                                         calldata->arg.fmode);
2223                         break;
2224                 case -NFS4ERR_STALE_STATEID:
2225                 case -NFS4ERR_OLD_STATEID:
2226                 case -NFS4ERR_BAD_STATEID:
2227                 case -NFS4ERR_EXPIRED:
2228                         if (calldata->arg.fmode == 0)
2229                                 break;
2230                 default:
2231                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2232                                 rpc_restart_call_prepare(task);
2233         }
2234         nfs_release_seqid(calldata->arg.seqid);
2235         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2236         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2237 }
2238
2239 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2240 {
2241         struct nfs4_closedata *calldata = data;
2242         struct nfs4_state *state = calldata->state;
2243         struct inode *inode = calldata->inode;
2244         int call_close = 0;
2245
2246         dprintk("%s: begin!\n", __func__);
2247         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2248                 goto out_wait;
2249
2250         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2251         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2252         spin_lock(&state->owner->so_lock);
2253         /* Calculate the change in open mode */
2254         if (state->n_rdwr == 0) {
2255                 if (state->n_rdonly == 0) {
2256                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2257                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2258                         calldata->arg.fmode &= ~FMODE_READ;
2259                 }
2260                 if (state->n_wronly == 0) {
2261                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2262                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2263                         calldata->arg.fmode &= ~FMODE_WRITE;
2264                 }
2265         }
2266         if (!nfs4_valid_open_stateid(state))
2267                 call_close = 0;
2268         spin_unlock(&state->owner->so_lock);
2269
2270         if (!call_close) {
2271                 /* Note: exit _without_ calling nfs4_close_done */
2272                 goto out_no_action;
2273         }
2274
2275         if (calldata->arg.fmode == 0) {
2276                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2277                 if (calldata->roc &&
2278                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2279                         goto out_wait;
2280         }
2281
2282         nfs_fattr_init(calldata->res.fattr);
2283         calldata->timestamp = jiffies;
2284         if (nfs4_setup_sequence(NFS_SERVER(inode),
2285                                 &calldata->arg.seq_args,
2286                                 &calldata->res.seq_res,
2287                                 task) != 0)
2288                 nfs_release_seqid(calldata->arg.seqid);
2289         dprintk("%s: done!\n", __func__);
2290         return;
2291 out_no_action:
2292         task->tk_action = NULL;
2293 out_wait:
2294         nfs4_sequence_done(task, &calldata->res.seq_res);
2295 }
2296
2297 static const struct rpc_call_ops nfs4_close_ops = {
2298         .rpc_call_prepare = nfs4_close_prepare,
2299         .rpc_call_done = nfs4_close_done,
2300         .rpc_release = nfs4_free_closedata,
2301 };
2302
2303 /*
2304  * It is possible for data to be read/written from a mem-mapped file
2305  * after the sys_close call (which hits the vfs layer as a flush).
2306  * This means that we can't safely call nfsv4 close on a file until
2307  * the inode is cleared. This in turn means that we are not good
2308  * NFSv4 citizens - we do not indicate to the server to update the file's
2309  * share state even when we are done with one of the three share
2310  * stateid's in the inode.
2311  *
2312  * NOTE: Caller must be holding the sp->so_owner semaphore!
2313  */
2314 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2315 {
2316         struct nfs_server *server = NFS_SERVER(state->inode);
2317         struct nfs4_closedata *calldata;
2318         struct nfs4_state_owner *sp = state->owner;
2319         struct rpc_task *task;
2320         struct rpc_message msg = {
2321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2322                 .rpc_cred = state->owner->so_cred,
2323         };
2324         struct rpc_task_setup task_setup_data = {
2325                 .rpc_client = server->client,
2326                 .rpc_message = &msg,
2327                 .callback_ops = &nfs4_close_ops,
2328                 .workqueue = nfsiod_workqueue,
2329                 .flags = RPC_TASK_ASYNC,
2330         };
2331         int status = -ENOMEM;
2332
2333         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2334         if (calldata == NULL)
2335                 goto out;
2336         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2337         calldata->inode = state->inode;
2338         calldata->state = state;
2339         calldata->arg.fh = NFS_FH(state->inode);
2340         calldata->arg.stateid = &state->open_stateid;
2341         /* Serialization for the sequence id */
2342         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2343         if (calldata->arg.seqid == NULL)
2344                 goto out_free_calldata;
2345         calldata->arg.fmode = 0;
2346         calldata->arg.bitmask = server->cache_consistency_bitmask;
2347         calldata->res.fattr = &calldata->fattr;
2348         calldata->res.seqid = calldata->arg.seqid;
2349         calldata->res.server = server;
2350         calldata->roc = pnfs_roc(state->inode);
2351         nfs_sb_active(calldata->inode->i_sb);
2352
2353         msg.rpc_argp = &calldata->arg;
2354         msg.rpc_resp = &calldata->res;
2355         task_setup_data.callback_data = calldata;
2356         task = rpc_run_task(&task_setup_data);
2357         if (IS_ERR(task))
2358                 return PTR_ERR(task);
2359         status = 0;
2360         if (wait)
2361                 status = rpc_wait_for_completion_task(task);
2362         rpc_put_task(task);
2363         return status;
2364 out_free_calldata:
2365         kfree(calldata);
2366 out:
2367         nfs4_put_open_state(state);
2368         nfs4_put_state_owner(sp);
2369         return status;
2370 }
2371
2372 static struct inode *
2373 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2374 {
2375         struct nfs4_state *state;
2376
2377         /* Protect against concurrent sillydeletes */
2378         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2379                              ctx->cred, &ctx->mdsthreshold);
2380         if (IS_ERR(state))
2381                 return ERR_CAST(state);
2382         ctx->state = state;
2383         return igrab(state->inode);
2384 }
2385
2386 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2387 {
2388         if (ctx->state == NULL)
2389                 return;
2390         if (is_sync)
2391                 nfs4_close_sync(ctx->state, ctx->mode);
2392         else
2393                 nfs4_close_state(ctx->state, ctx->mode);
2394 }
2395
2396 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2397 {
2398         struct nfs4_server_caps_arg args = {
2399                 .fhandle = fhandle,
2400         };
2401         struct nfs4_server_caps_res res = {};
2402         struct rpc_message msg = {
2403                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2404                 .rpc_argp = &args,
2405                 .rpc_resp = &res,
2406         };
2407         int status;
2408
2409         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2410         if (status == 0) {
2411                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2412                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2413                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2414                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2415                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2416                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2417                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2418                         server->caps |= NFS_CAP_ACLS;
2419                 if (res.has_links != 0)
2420                         server->caps |= NFS_CAP_HARDLINKS;
2421                 if (res.has_symlinks != 0)
2422                         server->caps |= NFS_CAP_SYMLINKS;
2423                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2424                         server->caps |= NFS_CAP_FILEID;
2425                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2426                         server->caps |= NFS_CAP_MODE;
2427                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2428                         server->caps |= NFS_CAP_NLINK;
2429                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2430                         server->caps |= NFS_CAP_OWNER;
2431                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2432                         server->caps |= NFS_CAP_OWNER_GROUP;
2433                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2434                         server->caps |= NFS_CAP_ATIME;
2435                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2436                         server->caps |= NFS_CAP_CTIME;
2437                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2438                         server->caps |= NFS_CAP_MTIME;
2439
2440                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2441                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2442                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2443                 server->acl_bitmask = res.acl_bitmask;
2444                 server->fh_expire_type = res.fh_expire_type;
2445         }
2446
2447         return status;
2448 }
2449
2450 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2451 {
2452         struct nfs4_exception exception = { };
2453         int err;
2454         do {
2455                 err = nfs4_handle_exception(server,
2456                                 _nfs4_server_capabilities(server, fhandle),
2457                                 &exception);
2458         } while (exception.retry);
2459         return err;
2460 }
2461
2462 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2463                 struct nfs_fsinfo *info)
2464 {
2465         struct nfs4_lookup_root_arg args = {
2466                 .bitmask = nfs4_fattr_bitmap,
2467         };
2468         struct nfs4_lookup_res res = {
2469                 .server = server,
2470                 .fattr = info->fattr,
2471                 .fh = fhandle,
2472         };
2473         struct rpc_message msg = {
2474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2475                 .rpc_argp = &args,
2476                 .rpc_resp = &res,
2477         };
2478
2479         nfs_fattr_init(info->fattr);
2480         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2481 }
2482
2483 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2484                 struct nfs_fsinfo *info)
2485 {
2486         struct nfs4_exception exception = { };
2487         int err;
2488         do {
2489                 err = _nfs4_lookup_root(server, fhandle, info);
2490                 switch (err) {
2491                 case 0:
2492                 case -NFS4ERR_WRONGSEC:
2493                         goto out;
2494                 default:
2495                         err = nfs4_handle_exception(server, err, &exception);
2496                 }
2497         } while (exception.retry);
2498 out:
2499         return err;
2500 }
2501
2502 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2503                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2504 {
2505         struct rpc_auth *auth;
2506         int ret;
2507
2508         auth = rpcauth_create(flavor, server->client);
2509         if (IS_ERR(auth)) {
2510                 ret = -EIO;
2511                 goto out;
2512         }
2513         ret = nfs4_lookup_root(server, fhandle, info);
2514 out:
2515         return ret;
2516 }
2517
2518 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2519                               struct nfs_fsinfo *info)
2520 {
2521         int i, len, status = 0;
2522         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2523
2524         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2525         if (len < 0)
2526                 return len;
2527
2528         for (i = 0; i < len; i++) {
2529                 /* AUTH_UNIX is the default flavor if none was specified,
2530                  * thus has already been tried. */
2531                 if (flav_array[i] == RPC_AUTH_UNIX)
2532                         continue;
2533
2534                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2535                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2536                         continue;
2537                 break;
2538         }
2539         /*
2540          * -EACCESS could mean that the user doesn't have correct permissions
2541          * to access the mount.  It could also mean that we tried to mount
2542          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2543          * existing mount programs don't handle -EACCES very well so it should
2544          * be mapped to -EPERM instead.
2545          */
2546         if (status == -EACCES)
2547                 status = -EPERM;
2548         return status;
2549 }
2550
2551 /*
2552  * get the file handle for the "/" directory on the server
2553  */
2554 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2555                          struct nfs_fsinfo *info)
2556 {
2557         int minor_version = server->nfs_client->cl_minorversion;
2558         int status = nfs4_lookup_root(server, fhandle, info);
2559         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2560                 /*
2561                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2562                  * by nfs4_map_errors() as this function exits.
2563                  */
2564                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2565         if (status == 0)
2566                 status = nfs4_server_capabilities(server, fhandle);
2567         if (status == 0)
2568                 status = nfs4_do_fsinfo(server, fhandle, info);
2569         return nfs4_map_errors(status);
2570 }
2571
2572 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2573                               struct nfs_fsinfo *info)
2574 {
2575         int error;
2576         struct nfs_fattr *fattr = info->fattr;
2577
2578         error = nfs4_server_capabilities(server, mntfh);
2579         if (error < 0) {
2580                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2581                 return error;
2582         }
2583
2584         error = nfs4_proc_getattr(server, mntfh, fattr);
2585         if (error < 0) {
2586                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2587                 return error;
2588         }
2589
2590         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2591             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2592                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2593
2594         return error;
2595 }
2596
2597 /*
2598  * Get locations and (maybe) other attributes of a referral.
2599  * Note that we'll actually follow the referral later when
2600  * we detect fsid mismatch in inode revalidation
2601  */
2602 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2603                              const struct qstr *name, struct nfs_fattr *fattr,
2604                              struct nfs_fh *fhandle)
2605 {
2606         int status = -ENOMEM;
2607         struct page *page = NULL;
2608         struct nfs4_fs_locations *locations = NULL;
2609
2610         page = alloc_page(GFP_KERNEL);
2611         if (page == NULL)
2612                 goto out;
2613         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2614         if (locations == NULL)
2615                 goto out;
2616
2617         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2618         if (status != 0)
2619                 goto out;
2620         /* Make sure server returned a different fsid for the referral */
2621         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2622                 dprintk("%s: server did not return a different fsid for"
2623                         " a referral at %s\n", __func__, name->name);
2624                 status = -EIO;
2625                 goto out;
2626         }
2627         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2628         nfs_fixup_referral_attributes(&locations->fattr);
2629
2630         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2631         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2632         memset(fhandle, 0, sizeof(struct nfs_fh));
2633 out:
2634         if (page)
2635                 __free_page(page);
2636         kfree(locations);
2637         return status;
2638 }
2639
2640 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2641 {
2642         struct nfs4_getattr_arg args = {
2643                 .fh = fhandle,
2644                 .bitmask = server->attr_bitmask,
2645         };
2646         struct nfs4_getattr_res res = {
2647                 .fattr = fattr,
2648                 .server = server,
2649         };
2650         struct rpc_message msg = {
2651                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2652                 .rpc_argp = &args,
2653                 .rpc_resp = &res,
2654         };
2655
2656         nfs_fattr_init(fattr);
2657         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2658 }
2659
2660 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2661 {
2662         struct nfs4_exception exception = { };
2663         int err;
2664         do {
2665                 err = nfs4_handle_exception(server,
2666                                 _nfs4_proc_getattr(server, fhandle, fattr),
2667                                 &exception);
2668         } while (exception.retry);
2669         return err;
2670 }
2671
2672 /*
2673  * The file is not closed if it is opened due to the a request to change
2674  * the size of the file. The open call will not be needed once the
2675  * VFS layer lookup-intents are implemented.
2676  *
2677  * Close is called when the inode is destroyed.
2678  * If we haven't opened the file for O_WRONLY, we
2679  * need to in the size_change case to obtain a stateid.
2680  *
2681  * Got race?
2682  * Because OPEN is always done by name in nfsv4, it is
2683  * possible that we opened a different file by the same
2684  * name.  We can recognize this race condition, but we
2685  * can't do anything about it besides returning an error.
2686  *
2687  * This will be fixed with VFS changes (lookup-intent).
2688  */
2689 static int
2690 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2691                   struct iattr *sattr)
2692 {
2693         struct inode *inode = dentry->d_inode;
2694         struct rpc_cred *cred = NULL;
2695         struct nfs4_state *state = NULL;
2696         int status;
2697
2698         if (pnfs_ld_layoutret_on_setattr(inode))
2699                 pnfs_commit_and_return_layout(inode);
2700
2701         nfs_fattr_init(fattr);
2702
2703         /* Deal with open(O_TRUNC) */
2704         if (sattr->ia_valid & ATTR_OPEN)
2705                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2706
2707         /* Optimization: if the end result is no change, don't RPC */
2708         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2709                 return 0;
2710
2711         /* Search for an existing open(O_WRITE) file */
2712         if (sattr->ia_valid & ATTR_FILE) {
2713                 struct nfs_open_context *ctx;
2714
2715                 ctx = nfs_file_open_context(sattr->ia_file);
2716                 if (ctx) {
2717                         cred = ctx->cred;
2718                         state = ctx->state;
2719                 }
2720         }
2721
2722         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2723         if (status == 0)
2724                 nfs_setattr_update_inode(inode, sattr);
2725         return status;
2726 }
2727
2728 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2729                 const struct qstr *name, struct nfs_fh *fhandle,
2730                 struct nfs_fattr *fattr)
2731 {
2732         struct nfs_server *server = NFS_SERVER(dir);
2733         int                    status;
2734         struct nfs4_lookup_arg args = {
2735                 .bitmask = server->attr_bitmask,
2736                 .dir_fh = NFS_FH(dir),
2737                 .name = name,
2738         };
2739         struct nfs4_lookup_res res = {
2740                 .server = server,
2741                 .fattr = fattr,
2742                 .fh = fhandle,
2743         };
2744         struct rpc_message msg = {
2745                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2746                 .rpc_argp = &args,
2747                 .rpc_resp = &res,
2748         };
2749
2750         nfs_fattr_init(fattr);
2751
2752         dprintk("NFS call  lookup %s\n", name->name);
2753         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2754         dprintk("NFS reply lookup: %d\n", status);
2755         return status;
2756 }
2757
2758 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2759 {
2760         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2761                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2762         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2763         fattr->nlink = 2;
2764 }
2765
2766 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2767                                    struct qstr *name, struct nfs_fh *fhandle,
2768                                    struct nfs_fattr *fattr)
2769 {
2770         struct nfs4_exception exception = { };
2771         struct rpc_clnt *client = *clnt;
2772         int err;
2773         do {
2774                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2775                 switch (err) {
2776                 case -NFS4ERR_BADNAME:
2777                         err = -ENOENT;
2778                         goto out;
2779                 case -NFS4ERR_MOVED:
2780                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2781                         goto out;
2782                 case -NFS4ERR_WRONGSEC:
2783                         err = -EPERM;
2784                         if (client != *clnt)
2785                                 goto out;
2786
2787                         client = nfs4_create_sec_client(client, dir, name);
2788                         if (IS_ERR(client))
2789                                 return PTR_ERR(client);
2790
2791                         exception.retry = 1;
2792                         break;
2793                 default:
2794                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2795                 }
2796         } while (exception.retry);
2797
2798 out:
2799         if (err == 0)
2800                 *clnt = client;
2801         else if (client != *clnt)
2802                 rpc_shutdown_client(client);
2803
2804         return err;
2805 }
2806
2807 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2808                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2809 {
2810         int status;
2811         struct rpc_clnt *client = NFS_CLIENT(dir);
2812
2813         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2814         if (client != NFS_CLIENT(dir)) {
2815                 rpc_shutdown_client(client);
2816                 nfs_fixup_secinfo_attributes(fattr);
2817         }
2818         return status;
2819 }
2820
2821 struct rpc_clnt *
2822 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2823                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2824 {
2825         int status;
2826         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2827
2828         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2829         if (status < 0) {
2830                 rpc_shutdown_client(client);
2831                 return ERR_PTR(status);
2832         }
2833         return client;
2834 }
2835
2836 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2837 {
2838         struct nfs_server *server = NFS_SERVER(inode);
2839         struct nfs4_accessargs args = {
2840                 .fh = NFS_FH(inode),
2841                 .bitmask = server->cache_consistency_bitmask,
2842         };
2843         struct nfs4_accessres res = {
2844                 .server = server,
2845         };
2846         struct rpc_message msg = {
2847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2848                 .rpc_argp = &args,
2849                 .rpc_resp = &res,
2850                 .rpc_cred = entry->cred,
2851         };
2852         int mode = entry->mask;
2853         int status;
2854
2855         /*
2856          * Determine which access bits we want to ask for...
2857          */
2858         if (mode & MAY_READ)
2859                 args.access |= NFS4_ACCESS_READ;
2860         if (S_ISDIR(inode->i_mode)) {
2861                 if (mode & MAY_WRITE)
2862                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2863                 if (mode & MAY_EXEC)
2864                         args.access |= NFS4_ACCESS_LOOKUP;
2865         } else {
2866                 if (mode & MAY_WRITE)
2867                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2868                 if (mode & MAY_EXEC)
2869                         args.access |= NFS4_ACCESS_EXECUTE;
2870         }
2871
2872         res.fattr = nfs_alloc_fattr();
2873         if (res.fattr == NULL)
2874                 return -ENOMEM;
2875
2876         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2877         if (!status) {
2878                 nfs_access_set_mask(entry, res.access);
2879                 nfs_refresh_inode(inode, res.fattr);
2880         }
2881         nfs_free_fattr(res.fattr);
2882         return status;
2883 }
2884
2885 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2886 {
2887         struct nfs4_exception exception = { };
2888         int err;
2889         do {
2890                 err = nfs4_handle_exception(NFS_SERVER(inode),
2891                                 _nfs4_proc_access(inode, entry),
2892                                 &exception);
2893         } while (exception.retry);
2894         return err;
2895 }
2896
2897 /*
2898  * TODO: For the time being, we don't try to get any attributes
2899  * along with any of the zero-copy operations READ, READDIR,
2900  * READLINK, WRITE.
2901  *
2902  * In the case of the first three, we want to put the GETATTR
2903  * after the read-type operation -- this is because it is hard
2904  * to predict the length of a GETATTR response in v4, and thus
2905  * align the READ data correctly.  This means that the GETATTR
2906  * may end up partially falling into the page cache, and we should
2907  * shift it into the 'tail' of the xdr_buf before processing.
2908  * To do this efficiently, we need to know the total length
2909  * of data received, which doesn't seem to be available outside
2910  * of the RPC layer.
2911  *
2912  * In the case of WRITE, we also want to put the GETATTR after
2913  * the operation -- in this case because we want to make sure
2914  * we get the post-operation mtime and size.
2915  *
2916  * Both of these changes to the XDR layer would in fact be quite
2917  * minor, but I decided to leave them for a subsequent patch.
2918  */
2919 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2920                 unsigned int pgbase, unsigned int pglen)
2921 {
2922         struct nfs4_readlink args = {
2923                 .fh       = NFS_FH(inode),
2924                 .pgbase   = pgbase,
2925                 .pglen    = pglen,
2926                 .pages    = &page,
2927         };
2928         struct nfs4_readlink_res res;
2929         struct rpc_message msg = {
2930                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2931                 .rpc_argp = &args,
2932                 .rpc_resp = &res,
2933         };
2934
2935         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2936 }
2937
2938 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2939                 unsigned int pgbase, unsigned int pglen)
2940 {
2941         struct nfs4_exception exception = { };
2942         int err;
2943         do {
2944                 err = nfs4_handle_exception(NFS_SERVER(inode),
2945                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2946                                 &exception);
2947         } while (exception.retry);
2948         return err;
2949 }
2950
2951 /*
2952  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2953  */
2954 static int
2955 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2956                  int flags)
2957 {
2958         struct nfs_open_context *ctx;
2959         struct nfs4_state *state;
2960         int status = 0;
2961
2962         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2963         if (IS_ERR(ctx))
2964                 return PTR_ERR(ctx);
2965
2966         sattr->ia_mode &= ~current_umask();
2967         state = nfs4_do_open(dir, dentry, ctx->mode,
2968                         flags, sattr, ctx->cred,
2969                         &ctx->mdsthreshold);
2970         d_drop(dentry);
2971         if (IS_ERR(state)) {
2972                 status = PTR_ERR(state);
2973                 goto out;
2974         }
2975         d_add(dentry, igrab(state->inode));
2976         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2977         ctx->state = state;
2978 out:
2979         put_nfs_open_context(ctx);
2980         return status;
2981 }
2982
2983 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2984 {
2985         struct nfs_server *server = NFS_SERVER(dir);
2986         struct nfs_removeargs args = {
2987                 .fh = NFS_FH(dir),
2988                 .name = *name,
2989         };
2990         struct nfs_removeres res = {
2991                 .server = server,
2992         };
2993         struct rpc_message msg = {
2994                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2995                 .rpc_argp = &args,
2996                 .rpc_resp = &res,
2997         };
2998         int status;
2999
3000         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3001         if (status == 0)
3002                 update_changeattr(dir, &res.cinfo);
3003         return status;
3004 }
3005
3006 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3007 {
3008         struct nfs4_exception exception = { };
3009         int err;
3010         do {
3011                 err = nfs4_handle_exception(NFS_SERVER(dir),
3012                                 _nfs4_proc_remove(dir, name),
3013                                 &exception);
3014         } while (exception.retry);
3015         return err;
3016 }
3017
3018 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3019 {
3020         struct nfs_server *server = NFS_SERVER(dir);
3021         struct nfs_removeargs *args = msg->rpc_argp;
3022         struct nfs_removeres *res = msg->rpc_resp;
3023
3024         res->server = server;
3025         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3026         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3027 }
3028
3029 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3030 {
3031         nfs4_setup_sequence(NFS_SERVER(data->dir),
3032                         &data->args.seq_args,
3033                         &data->res.seq_res,
3034                         task);
3035 }
3036
3037 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3038 {
3039         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3040
3041         if (!nfs4_sequence_done(task, &res->seq_res))
3042                 return 0;
3043         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3044                 return 0;
3045         update_changeattr(dir, &res->cinfo);
3046         return 1;
3047 }
3048
3049 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3050 {
3051         struct nfs_server *server = NFS_SERVER(dir);
3052         struct nfs_renameargs *arg = msg->rpc_argp;
3053         struct nfs_renameres *res = msg->rpc_resp;
3054
3055         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3056         res->server = server;
3057         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3058 }
3059
3060 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3061 {
3062         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3063                         &data->args.seq_args,
3064                         &data->res.seq_res,
3065                         task);
3066 }
3067
3068 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3069                                  struct inode *new_dir)
3070 {
3071         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3072
3073         if (!nfs4_sequence_done(task, &res->seq_res))
3074                 return 0;
3075         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3076                 return 0;
3077
3078         update_changeattr(old_dir, &res->old_cinfo);
3079         update_changeattr(new_dir, &res->new_cinfo);
3080         return 1;
3081 }
3082
3083 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3084                 struct inode *new_dir, struct qstr *new_name)
3085 {
3086         struct nfs_server *server = NFS_SERVER(old_dir);
3087         struct nfs_renameargs arg = {
3088                 .old_dir = NFS_FH(old_dir),
3089                 .new_dir = NFS_FH(new_dir),
3090                 .old_name = old_name,
3091                 .new_name = new_name,
3092         };
3093         struct nfs_renameres res = {
3094                 .server = server,
3095         };
3096         struct rpc_message msg = {
3097                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3098                 .rpc_argp = &arg,
3099                 .rpc_resp = &res,
3100         };
3101         int status = -ENOMEM;
3102
3103         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3104         if (!status) {
3105                 update_changeattr(old_dir, &res.old_cinfo);
3106                 update_changeattr(new_dir, &res.new_cinfo);
3107         }
3108         return status;
3109 }
3110
3111 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3112                 struct inode *new_dir, struct qstr *new_name)
3113 {
3114         struct nfs4_exception exception = { };
3115         int err;
3116         do {
3117                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3118                                 _nfs4_proc_rename(old_dir, old_name,
3119                                         new_dir, new_name),
3120                                 &exception);
3121         } while (exception.retry);
3122         return err;
3123 }
3124
3125 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3126 {
3127         struct nfs_server *server = NFS_SERVER(inode);
3128         struct nfs4_link_arg arg = {
3129                 .fh     = NFS_FH(inode),
3130                 .dir_fh = NFS_FH(dir),
3131                 .name   = name,
3132                 .bitmask = server->attr_bitmask,
3133         };
3134         struct nfs4_link_res res = {
3135                 .server = server,
3136         };
3137         struct rpc_message msg = {
3138                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3139                 .rpc_argp = &arg,
3140                 .rpc_resp = &res,
3141         };
3142         int status = -ENOMEM;
3143
3144         res.fattr = nfs_alloc_fattr();
3145         if (res.fattr == NULL)
3146                 goto out;
3147
3148         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3149         if (!status) {
3150                 update_changeattr(dir, &res.cinfo);
3151                 nfs_post_op_update_inode(inode, res.fattr);
3152         }
3153 out:
3154         nfs_free_fattr(res.fattr);
3155         return status;
3156 }
3157
3158 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3159 {
3160         struct nfs4_exception exception = { };
3161         int err;
3162         do {
3163                 err = nfs4_handle_exception(NFS_SERVER(inode),
3164                                 _nfs4_proc_link(inode, dir, name),
3165                                 &exception);
3166         } while (exception.retry);
3167         return err;
3168 }
3169
3170 struct nfs4_createdata {
3171         struct rpc_message msg;
3172         struct nfs4_create_arg arg;
3173         struct nfs4_create_res res;
3174         struct nfs_fh fh;
3175         struct nfs_fattr fattr;
3176 };
3177
3178 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3179                 struct qstr *name, struct iattr *sattr, u32 ftype)
3180 {
3181         struct nfs4_createdata *data;
3182
3183         data = kzalloc(sizeof(*data), GFP_KERNEL);
3184         if (data != NULL) {
3185                 struct nfs_server *server = NFS_SERVER(dir);
3186
3187                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3188                 data->msg.rpc_argp = &data->arg;
3189                 data->msg.rpc_resp = &data->res;
3190                 data->arg.dir_fh = NFS_FH(dir);
3191                 data->arg.server = server;
3192                 data->arg.name = name;
3193                 data->arg.attrs = sattr;
3194                 data->arg.ftype = ftype;
3195                 data->arg.bitmask = server->attr_bitmask;
3196                 data->res.server = server;
3197                 data->res.fh = &data->fh;
3198                 data->res.fattr = &data->fattr;
3199                 nfs_fattr_init(data->res.fattr);
3200         }
3201         return data;
3202 }
3203
3204 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3205 {
3206         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3207                                     &data->arg.seq_args, &data->res.seq_res, 1);
3208         if (status == 0) {
3209                 update_changeattr(dir, &data->res.dir_cinfo);
3210                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3211         }
3212         return status;
3213 }
3214
3215 static void nfs4_free_createdata(struct nfs4_createdata *data)
3216 {
3217         kfree(data);
3218 }
3219
3220 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3221                 struct page *page, unsigned int len, struct iattr *sattr)
3222 {
3223         struct nfs4_createdata *data;
3224         int status = -ENAMETOOLONG;
3225
3226         if (len > NFS4_MAXPATHLEN)
3227                 goto out;
3228
3229         status = -ENOMEM;
3230         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3231         if (data == NULL)
3232                 goto out;
3233
3234         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3235         data->arg.u.symlink.pages = &page;
3236         data->arg.u.symlink.len = len;
3237
3238         status = nfs4_do_create(dir, dentry, data);
3239
3240         nfs4_free_createdata(data);
3241 out:
3242         return status;
3243 }
3244
3245 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3246                 struct page *page, unsigned int len, struct iattr *sattr)
3247 {
3248         struct nfs4_exception exception = { };
3249         int err;
3250         do {
3251                 err = nfs4_handle_exception(NFS_SERVER(dir),
3252                                 _nfs4_proc_symlink(dir, dentry, page,
3253                                                         len, sattr),
3254                                 &exception);
3255         } while (exception.retry);
3256         return err;
3257 }
3258
3259 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3260                 struct iattr *sattr)
3261 {
3262         struct nfs4_createdata *data;
3263         int status = -ENOMEM;
3264
3265         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3266         if (data == NULL)
3267                 goto out;
3268
3269         status = nfs4_do_create(dir, dentry, data);
3270
3271         nfs4_free_createdata(data);
3272 out:
3273         return status;
3274 }
3275
3276 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3277                 struct iattr *sattr)
3278 {
3279         struct nfs4_exception exception = { };
3280         int err;
3281
3282         sattr->ia_mode &= ~current_umask();
3283         do {
3284                 err = nfs4_handle_exception(NFS_SERVER(dir),
3285                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3286                                 &exception);
3287         } while (exception.retry);
3288         return err;
3289 }
3290
3291 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3292                 u64 cookie, struct page **pages, unsigned int count, int plus)
3293 {
3294         struct inode            *dir = dentry->d_inode;
3295         struct nfs4_readdir_arg args = {
3296                 .fh = NFS_FH(dir),
3297                 .pages = pages,
3298                 .pgbase = 0,
3299                 .count = count,
3300                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3301                 .plus = plus,
3302         };
3303         struct nfs4_readdir_res res;
3304         struct rpc_message msg = {
3305                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3306                 .rpc_argp = &args,
3307                 .rpc_resp = &res,
3308                 .rpc_cred = cred,
3309         };
3310         int                     status;
3311
3312         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3313                         dentry->d_parent->d_name.name,
3314                         dentry->d_name.name,
3315                         (unsigned long long)cookie);
3316         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3317         res.pgbase = args.pgbase;
3318         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3319         if (status >= 0) {
3320                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3321                 status += args.pgbase;
3322         }
3323
3324         nfs_invalidate_atime(dir);
3325
3326         dprintk("%s: returns %d\n", __func__, status);
3327         return status;
3328 }
3329
3330 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3331                 u64 cookie, struct page **pages, unsigned int count, int plus)
3332 {
3333         struct nfs4_exception exception = { };
3334         int err;
3335         do {
3336                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3337                                 _nfs4_proc_readdir(dentry, cred, cookie,
3338                                         pages, count, plus),
3339                                 &exception);
3340         } while (exception.retry);
3341         return err;
3342 }
3343
3344 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3345                 struct iattr *sattr, dev_t rdev)
3346 {
3347         struct nfs4_createdata *data;
3348         int mode = sattr->ia_mode;
3349         int status = -ENOMEM;
3350
3351         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3352         if (data == NULL)
3353                 goto out;
3354
3355         if (S_ISFIFO(mode))
3356                 data->arg.ftype = NF4FIFO;
3357         else if (S_ISBLK(mode)) {
3358                 data->arg.ftype = NF4BLK;
3359                 data->arg.u.device.specdata1 = MAJOR(rdev);
3360                 data->arg.u.device.specdata2 = MINOR(rdev);
3361         }
3362         else if (S_ISCHR(mode)) {
3363                 data->arg.ftype = NF4CHR;
3364                 data->arg.u.device.specdata1 = MAJOR(rdev);
3365                 data->arg.u.device.specdata2 = MINOR(rdev);
3366         } else if (!S_ISSOCK(mode)) {
3367                 status = -EINVAL;
3368                 goto out_free;
3369         }
3370
3371         status = nfs4_do_create(dir, dentry, data);
3372 out_free:
3373         nfs4_free_createdata(data);
3374 out:
3375         return status;
3376 }
3377
3378 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3379                 struct iattr *sattr, dev_t rdev)
3380 {
3381         struct nfs4_exception exception = { };
3382         int err;
3383
3384         sattr->ia_mode &= ~current_umask();
3385         do {
3386                 err = nfs4_handle_exception(NFS_SERVER(dir),
3387                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3388                                 &exception);
3389         } while (exception.retry);
3390         return err;
3391 }
3392
3393 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3394                  struct nfs_fsstat *fsstat)
3395 {
3396         struct nfs4_statfs_arg args = {
3397                 .fh = fhandle,
3398                 .bitmask = server->attr_bitmask,
3399         };
3400         struct nfs4_statfs_res res = {
3401                 .fsstat = fsstat,
3402         };
3403         struct rpc_message msg = {
3404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3405                 .rpc_argp = &args,
3406                 .rpc_resp = &res,
3407         };
3408
3409         nfs_fattr_init(fsstat->fattr);
3410         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3411 }
3412
3413 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3414 {
3415         struct nfs4_exception exception = { };
3416         int err;
3417         do {
3418                 err = nfs4_handle_exception(server,
3419                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3420                                 &exception);
3421         } while (exception.retry);
3422         return err;
3423 }
3424
3425 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3426                 struct nfs_fsinfo *fsinfo)
3427 {
3428         struct nfs4_fsinfo_arg args = {
3429                 .fh = fhandle,
3430                 .bitmask = server->attr_bitmask,
3431         };
3432         struct nfs4_fsinfo_res res = {
3433                 .fsinfo = fsinfo,
3434         };
3435         struct rpc_message msg = {
3436                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3437                 .rpc_argp = &args,
3438                 .rpc_resp = &res,
3439         };
3440
3441         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3442 }
3443
3444 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3445 {
3446         struct nfs4_exception exception = { };
3447         int err;
3448
3449         do {
3450                 err = nfs4_handle_exception(server,
3451                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3452                                 &exception);
3453         } while (exception.retry);
3454         return err;
3455 }
3456
3457 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3458 {
3459         int error;
3460
3461         nfs_fattr_init(fsinfo->fattr);
3462         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3463         if (error == 0) {
3464                 /* block layout checks this! */
3465                 server->pnfs_blksize = fsinfo->blksize;
3466                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3467         }
3468
3469         return error;
3470 }
3471
3472 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3473                 struct nfs_pathconf *pathconf)
3474 {
3475         struct nfs4_pathconf_arg args = {
3476                 .fh = fhandle,
3477                 .bitmask = server->attr_bitmask,
3478         };
3479         struct nfs4_pathconf_res res = {
3480                 .pathconf = pathconf,
3481         };
3482         struct rpc_message msg = {
3483                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3484                 .rpc_argp = &args,
3485                 .rpc_resp = &res,
3486         };
3487
3488         /* None of the pathconf attributes are mandatory to implement */
3489         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3490                 memset(pathconf, 0, sizeof(*pathconf));
3491                 return 0;
3492         }
3493
3494         nfs_fattr_init(pathconf->fattr);
3495         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3496 }
3497
3498 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3499                 struct nfs_pathconf *pathconf)
3500 {
3501         struct nfs4_exception exception = { };
3502         int err;
3503
3504         do {
3505                 err = nfs4_handle_exception(server,
3506                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3507                                 &exception);
3508         } while (exception.retry);
3509         return err;
3510 }
3511
3512 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3513                 const struct nfs_open_context *ctx,
3514                 const struct nfs_lock_context *l_ctx,
3515                 fmode_t fmode)
3516 {
3517         const struct nfs_lockowner *lockowner = NULL;
3518
3519         if (l_ctx != NULL)
3520                 lockowner = &l_ctx->lockowner;
3521         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3522 }
3523 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3524
3525 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3526                 const struct nfs_open_context *ctx,
3527                 const struct nfs_lock_context *l_ctx,
3528                 fmode_t fmode)
3529 {
3530         nfs4_stateid current_stateid;
3531
3532         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3533                 return false;
3534         return nfs4_stateid_match(stateid, &current_stateid);
3535 }
3536
3537 static bool nfs4_error_stateid_expired(int err)
3538 {
3539         switch (err) {
3540         case -NFS4ERR_DELEG_REVOKED:
3541         case -NFS4ERR_ADMIN_REVOKED:
3542         case -NFS4ERR_BAD_STATEID:
3543         case -NFS4ERR_STALE_STATEID:
3544         case -NFS4ERR_OLD_STATEID:
3545         case -NFS4ERR_OPENMODE:
3546         case -NFS4ERR_EXPIRED:
3547                 return true;
3548         }
3549         return false;
3550 }
3551
3552 void __nfs4_read_done_cb(struct nfs_read_data *data)
3553 {
3554         nfs_invalidate_atime(data->header->inode);
3555 }
3556
3557 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3558 {
3559         struct nfs_server *server = NFS_SERVER(data->header->inode);
3560
3561         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3562                 rpc_restart_call_prepare(task);
3563                 return -EAGAIN;
3564         }
3565
3566         __nfs4_read_done_cb(data);
3567         if (task->tk_status > 0)
3568                 renew_lease(server, data->timestamp);
3569         return 0;
3570 }
3571
3572 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3573                 struct nfs_readargs *args)
3574 {
3575
3576         if (!nfs4_error_stateid_expired(task->tk_status) ||
3577                 nfs4_stateid_is_current(&args->stateid,
3578                                 args->context,
3579                                 args->lock_context,
3580                                 FMODE_READ))
3581                 return false;
3582         rpc_restart_call_prepare(task);
3583         return true;
3584 }
3585
3586 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3587 {
3588
3589         dprintk("--> %s\n", __func__);
3590
3591         if (!nfs4_sequence_done(task, &data->res.seq_res))
3592                 return -EAGAIN;
3593         if (nfs4_read_stateid_changed(task, &data->args))
3594                 return -EAGAIN;
3595         return data->read_done_cb ? data->read_done_cb(task, data) :
3596                                     nfs4_read_done_cb(task, data);
3597 }
3598
3599 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3600 {
3601         data->timestamp   = jiffies;
3602         data->read_done_cb = nfs4_read_done_cb;
3603         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3604         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3605 }
3606
3607 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3608 {
3609         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3610                         &data->args.seq_args,
3611                         &data->res.seq_res,
3612                         task))
3613                 return;
3614         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3615                         data->args.lock_context, FMODE_READ);
3616 }
3617
3618 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3619 {
3620         struct inode *inode = data->header->inode;
3621
3622         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3623                 rpc_restart_call_prepare(task);
3624                 return -EAGAIN;
3625         }
3626         if (task->tk_status >= 0) {
3627                 renew_lease(NFS_SERVER(inode), data->timestamp);
3628                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3629         }
3630         return 0;
3631 }
3632
3633 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3634                 struct nfs_writeargs *args)
3635 {
3636
3637         if (!nfs4_error_stateid_expired(task->tk_status) ||
3638                 nfs4_stateid_is_current(&args->stateid,
3639                                 args->context,
3640                                 args->lock_context,
3641                                 FMODE_WRITE))
3642                 return false;
3643         rpc_restart_call_prepare(task);
3644         return true;
3645 }
3646
3647 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3648 {
3649         if (!nfs4_sequence_done(task, &data->res.seq_res))
3650                 return -EAGAIN;
3651         if (nfs4_write_stateid_changed(task, &data->args))
3652                 return -EAGAIN;
3653         return data->write_done_cb ? data->write_done_cb(task, data) :
3654                 nfs4_write_done_cb(task, data);
3655 }
3656
3657 static
3658 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3659 {
3660         const struct nfs_pgio_header *hdr = data->header;
3661
3662         /* Don't request attributes for pNFS or O_DIRECT writes */
3663         if (data->ds_clp != NULL || hdr->dreq != NULL)
3664                 return false;
3665         /* Otherwise, request attributes if and only if we don't hold
3666          * a delegation
3667          */
3668         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3669 }
3670
3671 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3672 {
3673         struct nfs_server *server = NFS_SERVER(data->header->inode);
3674
3675         if (!nfs4_write_need_cache_consistency_data(data)) {
3676                 data->args.bitmask = NULL;
3677                 data->res.fattr = NULL;
3678         } else
3679                 data->args.bitmask = server->cache_consistency_bitmask;
3680
3681         if (!data->write_done_cb)
3682                 data->write_done_cb = nfs4_write_done_cb;
3683         data->res.server = server;
3684         data->timestamp   = jiffies;
3685
3686         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3687         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3688 }
3689
3690 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3691 {
3692         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3693                         &data->args.seq_args,
3694                         &data->res.seq_res,
3695                         task))
3696                 return;
3697         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3698                         data->args.lock_context, FMODE_WRITE);
3699 }
3700
3701 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3702 {
3703         nfs4_setup_sequence(NFS_SERVER(data->inode),
3704                         &data->args.seq_args,
3705                         &data->res.seq_res,
3706                         task);
3707 }
3708
3709 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3710 {
3711         struct inode *inode = data->inode;
3712
3713         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3714                 rpc_restart_call_prepare(task);
3715                 return -EAGAIN;
3716         }
3717         return 0;
3718 }
3719
3720 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3721 {
3722         if (!nfs4_sequence_done(task, &data->res.seq_res))
3723                 return -EAGAIN;
3724         return data->commit_done_cb(task, data);
3725 }
3726
3727 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3728 {
3729         struct nfs_server *server = NFS_SERVER(data->inode);
3730
3731         if (data->commit_done_cb == NULL)
3732                 data->commit_done_cb = nfs4_commit_done_cb;
3733         data->res.server = server;
3734         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3735         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3736 }
3737
3738 struct nfs4_renewdata {
3739         struct nfs_client       *client;
3740         unsigned long           timestamp;
3741 };
3742
3743 /*
3744  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3745  * standalone procedure for queueing an asynchronous RENEW.
3746  */
3747 static void nfs4_renew_release(void *calldata)
3748 {
3749         struct nfs4_renewdata *data = calldata;
3750         struct nfs_client *clp = data->client;
3751
3752         if (atomic_read(&clp->cl_count) > 1)
3753                 nfs4_schedule_state_renewal(clp);
3754         nfs_put_client(clp);
3755         kfree(data);
3756 }
3757
3758 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3759 {
3760         struct nfs4_renewdata *data = calldata;
3761         struct nfs_client *clp = data->client;
3762         unsigned long timestamp = data->timestamp;
3763
3764         if (task->tk_status < 0) {
3765                 /* Unless we're shutting down, schedule state recovery! */
3766                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3767                         return;
3768                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3769                         nfs4_schedule_lease_recovery(clp);
3770                         return;
3771                 }
3772                 nfs4_schedule_path_down_recovery(clp);
3773         }
3774         do_renew_lease(clp, timestamp);
3775 }
3776
3777 static const struct rpc_call_ops nfs4_renew_ops = {
3778         .rpc_call_done = nfs4_renew_done,
3779         .rpc_release = nfs4_renew_release,
3780 };
3781
3782 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3783 {
3784         struct rpc_message msg = {
3785                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3786                 .rpc_argp       = clp,
3787                 .rpc_cred       = cred,
3788         };
3789         struct nfs4_renewdata *data;
3790
3791         if (renew_flags == 0)
3792                 return 0;
3793         if (!atomic_inc_not_zero(&clp->cl_count))
3794                 return -EIO;
3795         data = kmalloc(sizeof(*data), GFP_NOFS);
3796         if (data == NULL)
3797                 return -ENOMEM;
3798         data->client = clp;
3799         data->timestamp = jiffies;
3800         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3801                         &nfs4_renew_ops, data);
3802 }
3803
3804 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3805 {
3806         struct rpc_message msg = {
3807                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3808                 .rpc_argp       = clp,
3809                 .rpc_cred       = cred,
3810         };
3811         unsigned long now = jiffies;
3812         int status;
3813
3814         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3815         if (status < 0)
3816                 return status;
3817         do_renew_lease(clp, now);
3818         return 0;
3819 }
3820
3821 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3822 {
3823         return (server->caps & NFS_CAP_ACLS)
3824                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3825                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3826 }
3827
3828 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3829  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3830  * the stack.
3831  */
3832 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3833
3834 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3835                 struct page **pages, unsigned int *pgbase)
3836 {
3837         struct page *newpage, **spages;
3838         int rc = 0;
3839         size_t len;
3840         spages = pages;
3841
3842         do {
3843                 len = min_t(size_t, PAGE_SIZE, buflen);
3844                 newpage = alloc_page(GFP_KERNEL);
3845
3846                 if (newpage == NULL)
3847                         goto unwind;
3848                 memcpy(page_address(newpage), buf, len);
3849                 buf += len;
3850                 buflen -= len;
3851                 *pages++ = newpage;
3852                 rc++;
3853         } while (buflen != 0);
3854
3855         return rc;
3856
3857 unwind:
3858         for(; rc > 0; rc--)
3859                 __free_page(spages[rc-1]);
3860         return -ENOMEM;
3861 }
3862
3863 struct nfs4_cached_acl {
3864         int cached;
3865         size_t len;
3866         char data[0];
3867 };
3868
3869 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3870 {
3871         struct nfs_inode *nfsi = NFS_I(inode);
3872
3873         spin_lock(&inode->i_lock);
3874         kfree(nfsi->nfs4_acl);
3875         nfsi->nfs4_acl = acl;
3876         spin_unlock(&inode->i_lock);
3877 }
3878
3879 static void nfs4_zap_acl_attr(struct inode *inode)
3880 {
3881         nfs4_set_cached_acl(inode, NULL);
3882 }
3883
3884 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3885 {
3886         struct nfs_inode *nfsi = NFS_I(inode);
3887         struct nfs4_cached_acl *acl;
3888         int ret = -ENOENT;
3889
3890         spin_lock(&inode->i_lock);
3891         acl = nfsi->nfs4_acl;
3892         if (acl == NULL)
3893                 goto out;
3894         if (buf == NULL) /* user is just asking for length */
3895                 goto out_len;
3896         if (acl->cached == 0)
3897                 goto out;
3898         ret = -ERANGE; /* see getxattr(2) man page */
3899         if (acl->len > buflen)
3900                 goto out;
3901         memcpy(buf, acl->data, acl->len);
3902 out_len:
3903         ret = acl->len;
3904 out:
3905         spin_unlock(&inode->i_lock);
3906         return ret;
3907 }
3908
3909 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3910 {
3911         struct nfs4_cached_acl *acl;
3912         size_t buflen = sizeof(*acl) + acl_len;
3913
3914         if (buflen <= PAGE_SIZE) {
3915                 acl = kmalloc(buflen, GFP_KERNEL);
3916                 if (acl == NULL)
3917                         goto out;
3918                 acl->cached = 1;
3919                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3920         } else {
3921                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3922                 if (acl == NULL)
3923                         goto out;
3924                 acl->cached = 0;
3925         }
3926         acl->len = acl_len;
3927 out:
3928         nfs4_set_cached_acl(inode, acl);
3929 }
3930
3931 /*
3932  * The getxattr API returns the required buffer length when called with a
3933  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3934  * the required buf.  On a NULL buf, we send a page of data to the server
3935  * guessing that the ACL request can be serviced by a page. If so, we cache
3936  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3937  * the cache. If not so, we throw away the page, and cache the required
3938  * length. The next getxattr call will then produce another round trip to
3939  * the server, this time with the input buf of the required size.
3940  */
3941 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3942 {
3943         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3944         struct nfs_getaclargs args = {
3945                 .fh = NFS_FH(inode),
3946                 .acl_pages = pages,
3947                 .acl_len = buflen,
3948         };
3949         struct nfs_getaclres res = {
3950                 .acl_len = buflen,
3951         };
3952         struct rpc_message msg = {
3953                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3954                 .rpc_argp = &args,
3955                 .rpc_resp = &res,
3956         };
3957         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3958         int ret = -ENOMEM, i;
3959
3960         /* As long as we're doing a round trip to the server anyway,
3961          * let's be prepared for a page of acl data. */
3962         if (npages == 0)
3963                 npages = 1;
3964         if (npages > ARRAY_SIZE(pages))
3965                 return -ERANGE;
3966
3967         for (i = 0; i < npages; i++) {
3968                 pages[i] = alloc_page(GFP_KERNEL);
3969                 if (!pages[i])
3970                         goto out_free;
3971         }
3972
3973         /* for decoding across pages */
3974         res.acl_scratch = alloc_page(GFP_KERNEL);
3975         if (!res.acl_scratch)
3976                 goto out_free;
3977
3978         args.acl_len = npages * PAGE_SIZE;
3979         args.acl_pgbase = 0;
3980
3981         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3982                 __func__, buf, buflen, npages, args.acl_len);
3983         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3984                              &msg, &args.seq_args, &res.seq_res, 0);
3985         if (ret)
3986                 goto out_free;
3987
3988         /* Handle the case where the passed-in buffer is too short */
3989         if (res.acl_flags & NFS4_ACL_TRUNC) {
3990                 /* Did the user only issue a request for the acl length? */
3991                 if (buf == NULL)
3992                         goto out_ok;
3993                 ret = -ERANGE;
3994                 goto out_free;
3995         }
3996         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3997         if (buf) {
3998                 if (res.acl_len > buflen) {
3999                         ret = -ERANGE;
4000                         goto out_free;
4001                 }
4002                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4003         }
4004 out_ok:
4005         ret = res.acl_len;
4006 out_free:
4007         for (i = 0; i < npages; i++)
4008                 if (pages[i])
4009                         __free_page(pages[i]);
4010         if (res.acl_scratch)
4011                 __free_page(res.acl_scratch);
4012         return ret;
4013 }
4014
4015 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4016 {
4017         struct nfs4_exception exception = { };
4018         ssize_t ret;
4019         do {
4020                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4021                 if (ret >= 0)
4022                         break;
4023                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4024         } while (exception.retry);
4025         return ret;
4026 }
4027
4028 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4029 {
4030         struct nfs_server *server = NFS_SERVER(inode);
4031         int ret;
4032
4033         if (!nfs4_server_supports_acls(server))
4034                 return -EOPNOTSUPP;
4035         ret = nfs_revalidate_inode(server, inode);
4036         if (ret < 0)
4037                 return ret;
4038         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4039                 nfs_zap_acl_cache(inode);
4040         ret = nfs4_read_cached_acl(inode, buf, buflen);
4041         if (ret != -ENOENT)
4042                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4043                  * but no cached acl data, just the acl length */
4044                 return ret;
4045         return nfs4_get_acl_uncached(inode, buf, buflen);
4046 }
4047
4048 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4049 {
4050         struct nfs_server *server = NFS_SERVER(inode);
4051         struct page *pages[NFS4ACL_MAXPAGES];
4052         struct nfs_setaclargs arg = {
4053                 .fh             = NFS_FH(inode),
4054                 .acl_pages      = pages,
4055                 .acl_len        = buflen,
4056         };
4057         struct nfs_setaclres res;
4058         struct rpc_message msg = {
4059                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4060                 .rpc_argp       = &arg,
4061                 .rpc_resp       = &res,
4062         };
4063         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4064         int ret, i;
4065
4066         if (!nfs4_server_supports_acls(server))
4067                 return -EOPNOTSUPP;
4068         if (npages > ARRAY_SIZE(pages))
4069                 return -ERANGE;
4070         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4071         if (i < 0)
4072                 return i;
4073         nfs4_inode_return_delegation(inode);
4074         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4075
4076         /*
4077          * Free each page after tx, so the only ref left is
4078          * held by the network stack
4079          */
4080         for (; i > 0; i--)
4081                 put_page(pages[i-1]);
4082
4083         /*
4084          * Acl update can result in inode attribute update.
4085          * so mark the attribute cache invalid.
4086          */
4087         spin_lock(&inode->i_lock);
4088         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4089         spin_unlock(&inode->i_lock);
4090         nfs_access_zap_cache(inode);
4091         nfs_zap_acl_cache(inode);
4092         return ret;
4093 }
4094
4095 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4096 {
4097         struct nfs4_exception exception = { };
4098         int err;
4099         do {
4100                 err = nfs4_handle_exception(NFS_SERVER(inode),
4101                                 __nfs4_proc_set_acl(inode, buf, buflen),
4102                                 &exception);
4103         } while (exception.retry);
4104         return err;
4105 }
4106
4107 static int
4108 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4109 {
4110         struct nfs_client *clp = server->nfs_client;
4111
4112         if (task->tk_status >= 0)
4113                 return 0;
4114         switch(task->tk_status) {
4115                 case -NFS4ERR_DELEG_REVOKED:
4116                 case -NFS4ERR_ADMIN_REVOKED:
4117                 case -NFS4ERR_BAD_STATEID:
4118                         if (state == NULL)
4119                                 break;
4120                         nfs_remove_bad_delegation(state->inode);
4121                 case -NFS4ERR_OPENMODE:
4122                         if (state == NULL)
4123                                 break;
4124                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4125                                 goto stateid_invalid;
4126                         goto wait_on_recovery;
4127                 case -NFS4ERR_EXPIRED:
4128                         if (state != NULL) {
4129                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4130                                         goto stateid_invalid;
4131                         }
4132                 case -NFS4ERR_STALE_STATEID:
4133                 case -NFS4ERR_STALE_CLIENTID:
4134                         nfs4_schedule_lease_recovery(clp);
4135                         goto wait_on_recovery;
4136 #if defined(CONFIG_NFS_V4_1)
4137                 case -NFS4ERR_BADSESSION:
4138                 case -NFS4ERR_BADSLOT:
4139                 case -NFS4ERR_BAD_HIGH_SLOT:
4140                 case -NFS4ERR_DEADSESSION:
4141                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4142                 case -NFS4ERR_SEQ_FALSE_RETRY:
4143                 case -NFS4ERR_SEQ_MISORDERED:
4144                         dprintk("%s ERROR %d, Reset session\n", __func__,
4145                                 task->tk_status);
4146                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4147                         task->tk_status = 0;
4148                         return -EAGAIN;
4149 #endif /* CONFIG_NFS_V4_1 */
4150                 case -NFS4ERR_DELAY:
4151                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4152                 case -NFS4ERR_GRACE:
4153                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4154                         task->tk_status = 0;
4155                         return -EAGAIN;
4156                 case -NFS4ERR_RETRY_UNCACHED_REP:
4157                 case -NFS4ERR_OLD_STATEID:
4158                         task->tk_status = 0;
4159                         return -EAGAIN;
4160         }
4161         task->tk_status = nfs4_map_errors(task->tk_status);
4162         return 0;
4163 stateid_invalid:
4164         task->tk_status = -EIO;
4165         return 0;
4166 wait_on_recovery:
4167         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4168         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4169                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4170         task->tk_status = 0;
4171         return -EAGAIN;
4172 }
4173
4174 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4175                                     nfs4_verifier *bootverf)
4176 {
4177         __be32 verf[2];
4178
4179         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4180                 /* An impossible timestamp guarantees this value
4181                  * will never match a generated boot time. */
4182                 verf[0] = 0;
4183                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4184         } else {
4185                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4186                 verf[0] = (__be32)nn->boot_time.tv_sec;
4187                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4188         }
4189         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4190 }
4191
4192 static unsigned int
4193 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4194                                    char *buf, size_t len)
4195 {
4196         unsigned int result;
4197
4198         rcu_read_lock();
4199         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4200                                 clp->cl_ipaddr,
4201                                 rpc_peeraddr2str(clp->cl_rpcclient,
4202                                                         RPC_DISPLAY_ADDR),
4203                                 rpc_peeraddr2str(clp->cl_rpcclient,
4204                                                         RPC_DISPLAY_PROTO));
4205         rcu_read_unlock();
4206         return result;
4207 }
4208
4209 static unsigned int
4210 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4211                                 char *buf, size_t len)
4212 {
4213         char *nodename = clp->cl_rpcclient->cl_nodename;
4214
4215         if (nfs4_client_id_uniquifier[0] != '\0')
4216                 nodename = nfs4_client_id_uniquifier;
4217         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4218                                 clp->rpc_ops->version, clp->cl_minorversion,
4219                                 nodename);
4220 }
4221
4222 /**
4223  * nfs4_proc_setclientid - Negotiate client ID
4224  * @clp: state data structure
4225  * @program: RPC program for NFSv4 callback service
4226  * @port: IP port number for NFS4 callback service
4227  * @cred: RPC credential to use for this call
4228  * @res: where to place the result
4229  *
4230  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4231  */
4232 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4233                 unsigned short port, struct rpc_cred *cred,
4234                 struct nfs4_setclientid_res *res)
4235 {
4236         nfs4_verifier sc_verifier;
4237         struct nfs4_setclientid setclientid = {
4238                 .sc_verifier = &sc_verifier,
4239                 .sc_prog = program,
4240                 .sc_cb_ident = clp->cl_cb_ident,
4241         };
4242         struct rpc_message msg = {
4243                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4244                 .rpc_argp = &setclientid,
4245                 .rpc_resp = res,
4246                 .rpc_cred = cred,
4247         };
4248         int status;
4249
4250         /* nfs_client_id4 */
4251         nfs4_init_boot_verifier(clp, &sc_verifier);
4252         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4253                 setclientid.sc_name_len =
4254                                 nfs4_init_uniform_client_string(clp,
4255                                                 setclientid.sc_name,
4256                                                 sizeof(setclientid.sc_name));
4257         else
4258                 setclientid.sc_name_len =
4259                                 nfs4_init_nonuniform_client_string(clp,
4260                                                 setclientid.sc_name,
4261                                                 sizeof(setclientid.sc_name));
4262         /* cb_client4 */
4263         rcu_read_lock();
4264         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4265                                 sizeof(setclientid.sc_netid),
4266                                 rpc_peeraddr2str(clp->cl_rpcclient,
4267                                                         RPC_DISPLAY_NETID));
4268         rcu_read_unlock();
4269         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4270                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4271                                 clp->cl_ipaddr, port >> 8, port & 255);
4272
4273         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4274                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4275                 setclientid.sc_name_len, setclientid.sc_name);
4276         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4277         dprintk("NFS reply setclientid: %d\n", status);
4278         return status;
4279 }
4280
4281 /**
4282  * nfs4_proc_setclientid_confirm - Confirm client ID
4283  * @clp: state data structure
4284  * @res: result of a previous SETCLIENTID
4285  * @cred: RPC credential to use for this call
4286  *
4287  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4288  */
4289 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4290                 struct nfs4_setclientid_res *arg,
4291                 struct rpc_cred *cred)
4292 {
4293         struct nfs_fsinfo fsinfo;
4294         struct rpc_message msg = {
4295                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4296                 .rpc_argp = arg,
4297                 .rpc_resp = &fsinfo,
4298                 .rpc_cred = cred,
4299         };
4300         unsigned long now;
4301         int status;
4302
4303         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4304                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4305                 clp->cl_clientid);
4306         now = jiffies;
4307         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4308         if (status == 0) {
4309                 spin_lock(&clp->cl_lock);
4310                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4311                 clp->cl_last_renewal = now;
4312                 spin_unlock(&clp->cl_lock);
4313         }
4314         dprintk("NFS reply setclientid_confirm: %d\n", status);
4315         return status;
4316 }
4317
4318 struct nfs4_delegreturndata {
4319         struct nfs4_delegreturnargs args;
4320         struct nfs4_delegreturnres res;
4321         struct nfs_fh fh;
4322         nfs4_stateid stateid;
4323         unsigned long timestamp;
4324         struct nfs_fattr fattr;
4325         int rpc_status;
4326 };
4327
4328 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4329 {
4330         struct nfs4_delegreturndata *data = calldata;
4331
4332         if (!nfs4_sequence_done(task, &data->res.seq_res))
4333                 return;
4334
4335         switch (task->tk_status) {
4336         case -NFS4ERR_STALE_STATEID:
4337         case -NFS4ERR_EXPIRED:
4338         case 0:
4339                 renew_lease(data->res.server, data->timestamp);
4340                 break;
4341         default:
4342                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4343                                 -EAGAIN) {
4344                         rpc_restart_call_prepare(task);
4345                         return;
4346                 }
4347         }
4348         data->rpc_status = task->tk_status;
4349 }
4350
4351 static void nfs4_delegreturn_release(void *calldata)
4352 {
4353         kfree(calldata);
4354 }
4355
4356 #if defined(CONFIG_NFS_V4_1)
4357 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4358 {
4359         struct nfs4_delegreturndata *d_data;
4360
4361         d_data = (struct nfs4_delegreturndata *)data;
4362
4363         nfs4_setup_sequence(d_data->res.server,
4364                         &d_data->args.seq_args,
4365                         &d_data->res.seq_res,
4366                         task);
4367 }
4368 #endif /* CONFIG_NFS_V4_1 */
4369
4370 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4371 #if defined(CONFIG_NFS_V4_1)
4372         .rpc_call_prepare = nfs4_delegreturn_prepare,
4373 #endif /* CONFIG_NFS_V4_1 */
4374         .rpc_call_done = nfs4_delegreturn_done,
4375         .rpc_release = nfs4_delegreturn_release,
4376 };
4377
4378 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4379 {
4380         struct nfs4_delegreturndata *data;
4381         struct nfs_server *server = NFS_SERVER(inode);
4382         struct rpc_task *task;
4383         struct rpc_message msg = {
4384                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4385                 .rpc_cred = cred,
4386         };
4387         struct rpc_task_setup task_setup_data = {
4388                 .rpc_client = server->client,
4389                 .rpc_message = &msg,
4390                 .callback_ops = &nfs4_delegreturn_ops,
4391                 .flags = RPC_TASK_ASYNC,
4392         };
4393         int status = 0;
4394
4395         data = kzalloc(sizeof(*data), GFP_NOFS);
4396         if (data == NULL)
4397                 return -ENOMEM;
4398         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4399         data->args.fhandle = &data->fh;
4400         data->args.stateid = &data->stateid;
4401         data->args.bitmask = server->cache_consistency_bitmask;
4402         nfs_copy_fh(&data->fh, NFS_FH(inode));
4403         nfs4_stateid_copy(&data->stateid, stateid);
4404         data->res.fattr = &data->fattr;
4405         data->res.server = server;
4406         nfs_fattr_init(data->res.fattr);
4407         data->timestamp = jiffies;
4408         data->rpc_status = 0;
4409
4410         task_setup_data.callback_data = data;
4411         msg.rpc_argp = &data->args;
4412         msg.rpc_resp = &data->res;
4413         task = rpc_run_task(&task_setup_data);
4414         if (IS_ERR(task))
4415                 return PTR_ERR(task);
4416         if (!issync)
4417                 goto out;
4418         status = nfs4_wait_for_completion_rpc_task(task);
4419         if (status != 0)
4420                 goto out;
4421         status = data->rpc_status;
4422         if (status == 0)
4423                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4424         else
4425                 nfs_refresh_inode(inode, &data->fattr);
4426 out:
4427         rpc_put_task(task);
4428         return status;
4429 }
4430
4431 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4432 {
4433         struct nfs_server *server = NFS_SERVER(inode);
4434         struct nfs4_exception exception = { };
4435         int err;
4436         do {
4437                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4438                 switch (err) {
4439                         case -NFS4ERR_STALE_STATEID:
4440                         case -NFS4ERR_EXPIRED:
4441                         case 0:
4442                                 return 0;
4443                 }
4444                 err = nfs4_handle_exception(server, err, &exception);
4445         } while (exception.retry);
4446         return err;
4447 }
4448
4449 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4450 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4451
4452 /*
4453  * sleep, with exponential backoff, and retry the LOCK operation.
4454  */
4455 static unsigned long
4456 nfs4_set_lock_task_retry(unsigned long timeout)
4457 {
4458         freezable_schedule_timeout_killable(timeout);
4459         timeout <<= 1;
4460         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4461                 return NFS4_LOCK_MAXTIMEOUT;
4462         return timeout;
4463 }
4464
4465 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4466 {
4467         struct inode *inode = state->inode;
4468         struct nfs_server *server = NFS_SERVER(inode);
4469         struct nfs_client *clp = server->nfs_client;
4470         struct nfs_lockt_args arg = {
4471                 .fh = NFS_FH(inode),
4472                 .fl = request,
4473         };
4474         struct nfs_lockt_res res = {
4475                 .denied = request,
4476         };
4477         struct rpc_message msg = {
4478                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4479                 .rpc_argp       = &arg,
4480                 .rpc_resp       = &res,
4481                 .rpc_cred       = state->owner->so_cred,
4482         };
4483         struct nfs4_lock_state *lsp;
4484         int status;
4485
4486         arg.lock_owner.clientid = clp->cl_clientid;
4487         status = nfs4_set_lock_state(state, request);
4488         if (status != 0)
4489                 goto out;
4490         lsp = request->fl_u.nfs4_fl.owner;
4491         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4492         arg.lock_owner.s_dev = server->s_dev;
4493         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4494         switch (status) {
4495                 case 0:
4496                         request->fl_type = F_UNLCK;
4497                         break;
4498                 case -NFS4ERR_DENIED:
4499                         status = 0;
4500         }
4501         request->fl_ops->fl_release_private(request);
4502 out:
4503         return status;
4504 }
4505
4506 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4507 {
4508         struct nfs4_exception exception = { };
4509         int err;
4510
4511         do {
4512                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4513                                 _nfs4_proc_getlk(state, cmd, request),
4514                                 &exception);
4515         } while (exception.retry);
4516         return err;
4517 }
4518
4519 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4520 {
4521         int res = 0;
4522         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4523                 case FL_POSIX:
4524                         res = posix_lock_file_wait(file, fl);
4525                         break;
4526                 case FL_FLOCK:
4527                         res = flock_lock_file_wait(file, fl);
4528                         break;
4529                 default:
4530                         BUG();
4531         }
4532         return res;
4533 }
4534
4535 struct nfs4_unlockdata {
4536         struct nfs_locku_args arg;
4537         struct nfs_locku_res res;
4538         struct nfs4_lock_state *lsp;
4539         struct nfs_open_context *ctx;
4540         struct file_lock fl;
4541         const struct nfs_server *server;
4542         unsigned long timestamp;
4543 };
4544
4545 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4546                 struct nfs_open_context *ctx,
4547                 struct nfs4_lock_state *lsp,
4548                 struct nfs_seqid *seqid)
4549 {
4550         struct nfs4_unlockdata *p;
4551         struct inode *inode = lsp->ls_state->inode;
4552
4553         p = kzalloc(sizeof(*p), GFP_NOFS);
4554         if (p == NULL)
4555                 return NULL;
4556         p->arg.fh = NFS_FH(inode);
4557         p->arg.fl = &p->fl;
4558         p->arg.seqid = seqid;
4559         p->res.seqid = seqid;
4560         p->arg.stateid = &lsp->ls_stateid;
4561         p->lsp = lsp;
4562         atomic_inc(&lsp->ls_count);
4563         /* Ensure we don't close file until we're done freeing locks! */
4564         p->ctx = get_nfs_open_context(ctx);
4565         memcpy(&p->fl, fl, sizeof(p->fl));
4566         p->server = NFS_SERVER(inode);
4567         return p;
4568 }
4569
4570 static void nfs4_locku_release_calldata(void *data)
4571 {
4572         struct nfs4_unlockdata *calldata = data;
4573         nfs_free_seqid(calldata->arg.seqid);
4574         nfs4_put_lock_state(calldata->lsp);
4575         put_nfs_open_context(calldata->ctx);
4576         kfree(calldata);
4577 }
4578
4579 static void nfs4_locku_done(struct rpc_task *task, void *data)
4580 {
4581         struct nfs4_unlockdata *calldata = data;
4582
4583         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4584                 return;
4585         switch (task->tk_status) {
4586                 case 0:
4587                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4588                                         &calldata->res.stateid);
4589                         renew_lease(calldata->server, calldata->timestamp);
4590                         break;
4591                 case -NFS4ERR_BAD_STATEID:
4592                 case -NFS4ERR_OLD_STATEID:
4593                 case -NFS4ERR_STALE_STATEID:
4594                 case -NFS4ERR_EXPIRED:
4595                         break;
4596                 default:
4597                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4598                                 rpc_restart_call_prepare(task);
4599         }
4600         nfs_release_seqid(calldata->arg.seqid);
4601 }
4602
4603 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4604 {
4605         struct nfs4_unlockdata *calldata = data;
4606
4607         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4608                 goto out_wait;
4609         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4610                 /* Note: exit _without_ running nfs4_locku_done */
4611                 goto out_no_action;
4612         }
4613         calldata->timestamp = jiffies;
4614         if (nfs4_setup_sequence(calldata->server,
4615                                 &calldata->arg.seq_args,
4616                                 &calldata->res.seq_res,
4617                                 task) != 0)
4618                 nfs_release_seqid(calldata->arg.seqid);
4619         return;
4620 out_no_action:
4621         task->tk_action = NULL;
4622 out_wait:
4623         nfs4_sequence_done(task, &calldata->res.seq_res);
4624 }
4625
4626 static const struct rpc_call_ops nfs4_locku_ops = {
4627         .rpc_call_prepare = nfs4_locku_prepare,
4628         .rpc_call_done = nfs4_locku_done,
4629         .rpc_release = nfs4_locku_release_calldata,
4630 };
4631
4632 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4633                 struct nfs_open_context *ctx,
4634                 struct nfs4_lock_state *lsp,
4635                 struct nfs_seqid *seqid)
4636 {
4637         struct nfs4_unlockdata *data;
4638         struct rpc_message msg = {
4639                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4640                 .rpc_cred = ctx->cred,
4641         };
4642         struct rpc_task_setup task_setup_data = {
4643                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4644                 .rpc_message = &msg,
4645                 .callback_ops = &nfs4_locku_ops,
4646                 .workqueue = nfsiod_workqueue,
4647                 .flags = RPC_TASK_ASYNC,
4648         };
4649
4650         /* Ensure this is an unlock - when canceling a lock, the
4651          * canceled lock is passed in, and it won't be an unlock.
4652          */
4653         fl->fl_type = F_UNLCK;
4654
4655         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4656         if (data == NULL) {
4657                 nfs_free_seqid(seqid);
4658                 return ERR_PTR(-ENOMEM);
4659         }
4660
4661         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4662         msg.rpc_argp = &data->arg;
4663         msg.rpc_resp = &data->res;
4664         task_setup_data.callback_data = data;
4665         return rpc_run_task(&task_setup_data);
4666 }
4667
4668 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4669 {
4670         struct inode *inode = state->inode;
4671         struct nfs4_state_owner *sp = state->owner;
4672         struct nfs_inode *nfsi = NFS_I(inode);
4673         struct nfs_seqid *seqid;
4674         struct nfs4_lock_state *lsp;
4675         struct rpc_task *task;
4676         int status = 0;
4677         unsigned char fl_flags = request->fl_flags;
4678
4679         status = nfs4_set_lock_state(state, request);
4680         /* Unlock _before_ we do the RPC call */
4681         request->fl_flags |= FL_EXISTS;
4682         /* Exclude nfs_delegation_claim_locks() */
4683         mutex_lock(&sp->so_delegreturn_mutex);
4684         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4685         down_read(&nfsi->rwsem);
4686         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4687                 up_read(&nfsi->rwsem);
4688                 mutex_unlock(&sp->so_delegreturn_mutex);
4689                 goto out;
4690         }
4691         up_read(&nfsi->rwsem);
4692         mutex_unlock(&sp->so_delegreturn_mutex);
4693         if (status != 0)
4694                 goto out;
4695         /* Is this a delegated lock? */
4696         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4697                 goto out;
4698         lsp = request->fl_u.nfs4_fl.owner;
4699         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4700         status = -ENOMEM;
4701         if (seqid == NULL)
4702                 goto out;
4703         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4704         status = PTR_ERR(task);
4705         if (IS_ERR(task))
4706                 goto out;
4707         status = nfs4_wait_for_completion_rpc_task(task);
4708         rpc_put_task(task);
4709 out:
4710         request->fl_flags = fl_flags;
4711         return status;
4712 }
4713
4714 struct nfs4_lockdata {
4715         struct nfs_lock_args arg;
4716         struct nfs_lock_res res;
4717         struct nfs4_lock_state *lsp;
4718         struct nfs_open_context *ctx;
4719         struct file_lock fl;
4720         unsigned long timestamp;
4721         int rpc_status;
4722         int cancelled;
4723         struct nfs_server *server;
4724 };
4725
4726 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4727                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4728                 gfp_t gfp_mask)
4729 {
4730         struct nfs4_lockdata *p;
4731         struct inode *inode = lsp->ls_state->inode;
4732         struct nfs_server *server = NFS_SERVER(inode);
4733
4734         p = kzalloc(sizeof(*p), gfp_mask);
4735         if (p == NULL)
4736                 return NULL;
4737
4738         p->arg.fh = NFS_FH(inode);
4739         p->arg.fl = &p->fl;
4740         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4741         if (p->arg.open_seqid == NULL)
4742                 goto out_free;
4743         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4744         if (p->arg.lock_seqid == NULL)
4745                 goto out_free_seqid;
4746         p->arg.lock_stateid = &lsp->ls_stateid;
4747         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4748         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4749         p->arg.lock_owner.s_dev = server->s_dev;
4750         p->res.lock_seqid = p->arg.lock_seqid;
4751         p->lsp = lsp;
4752         p->server = server;
4753         atomic_inc(&lsp->ls_count);
4754         p->ctx = get_nfs_open_context(ctx);
4755         memcpy(&p->fl, fl, sizeof(p->fl));
4756         return p;
4757 out_free_seqid:
4758         nfs_free_seqid(p->arg.open_seqid);
4759 out_free:
4760         kfree(p);
4761         return NULL;
4762 }
4763
4764 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4765 {
4766         struct nfs4_lockdata *data = calldata;
4767         struct nfs4_state *state = data->lsp->ls_state;
4768
4769         dprintk("%s: begin!\n", __func__);
4770         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4771                 goto out_wait;
4772         /* Do we need to do an open_to_lock_owner? */
4773         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4774                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4775                         goto out_release_lock_seqid;
4776                 }
4777                 data->arg.open_stateid = &state->stateid;
4778                 data->arg.new_lock_owner = 1;
4779                 data->res.open_seqid = data->arg.open_seqid;
4780         } else
4781                 data->arg.new_lock_owner = 0;
4782         if (!nfs4_valid_open_stateid(state)) {
4783                 data->rpc_status = -EBADF;
4784                 task->tk_action = NULL;
4785                 goto out_release_open_seqid;
4786         }
4787         data->timestamp = jiffies;
4788         if (nfs4_setup_sequence(data->server,
4789                                 &data->arg.seq_args,
4790                                 &data->res.seq_res,
4791                                 task) == 0)
4792                 return;
4793 out_release_open_seqid:
4794         nfs_release_seqid(data->arg.open_seqid);
4795 out_release_lock_seqid:
4796         nfs_release_seqid(data->arg.lock_seqid);
4797 out_wait:
4798         nfs4_sequence_done(task, &data->res.seq_res);
4799         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4800 }
4801
4802 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4803 {
4804         struct nfs4_lockdata *data = calldata;
4805
4806         dprintk("%s: begin!\n", __func__);
4807
4808         if (!nfs4_sequence_done(task, &data->res.seq_res))
4809                 return;
4810
4811         data->rpc_status = task->tk_status;
4812         if (data->arg.new_lock_owner != 0) {
4813                 if (data->rpc_status == 0)
4814                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4815                 else
4816                         goto out;
4817         }
4818         if (data->rpc_status == 0) {
4819                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4820                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4821                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4822         }
4823 out:
4824         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4825 }
4826
4827 static void nfs4_lock_release(void *calldata)
4828 {
4829         struct nfs4_lockdata *data = calldata;
4830
4831         dprintk("%s: begin!\n", __func__);
4832         nfs_free_seqid(data->arg.open_seqid);
4833         if (data->cancelled != 0) {
4834                 struct rpc_task *task;
4835                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4836                                 data->arg.lock_seqid);
4837                 if (!IS_ERR(task))
4838                         rpc_put_task_async(task);
4839                 dprintk("%s: cancelling lock!\n", __func__);
4840         } else
4841                 nfs_free_seqid(data->arg.lock_seqid);
4842         nfs4_put_lock_state(data->lsp);
4843         put_nfs_open_context(data->ctx);
4844         kfree(data);
4845         dprintk("%s: done!\n", __func__);
4846 }
4847
4848 static const struct rpc_call_ops nfs4_lock_ops = {
4849         .rpc_call_prepare = nfs4_lock_prepare,
4850         .rpc_call_done = nfs4_lock_done,
4851         .rpc_release = nfs4_lock_release,
4852 };
4853
4854 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4855 {
4856         switch (error) {
4857         case -NFS4ERR_ADMIN_REVOKED:
4858         case -NFS4ERR_BAD_STATEID:
4859                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4860                 if (new_lock_owner != 0 ||
4861                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4862                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4863                 break;
4864         case -NFS4ERR_STALE_STATEID:
4865                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4866         case -NFS4ERR_EXPIRED:
4867                 nfs4_schedule_lease_recovery(server->nfs_client);
4868         };
4869 }
4870
4871 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4872 {
4873         struct nfs4_lockdata *data;
4874         struct rpc_task *task;
4875         struct rpc_message msg = {
4876                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4877                 .rpc_cred = state->owner->so_cred,
4878         };
4879         struct rpc_task_setup task_setup_data = {
4880                 .rpc_client = NFS_CLIENT(state->inode),
4881                 .rpc_message = &msg,
4882                 .callback_ops = &nfs4_lock_ops,
4883                 .workqueue = nfsiod_workqueue,
4884                 .flags = RPC_TASK_ASYNC,
4885         };
4886         int ret;
4887
4888         dprintk("%s: begin!\n", __func__);
4889         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4890                         fl->fl_u.nfs4_fl.owner,
4891                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4892         if (data == NULL)
4893                 return -ENOMEM;
4894         if (IS_SETLKW(cmd))
4895                 data->arg.block = 1;
4896         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4897         msg.rpc_argp = &data->arg;
4898         msg.rpc_resp = &data->res;
4899         task_setup_data.callback_data = data;
4900         if (recovery_type > NFS_LOCK_NEW) {
4901                 if (recovery_type == NFS_LOCK_RECLAIM)
4902                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4903                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4904         }
4905         task = rpc_run_task(&task_setup_data);
4906         if (IS_ERR(task))
4907                 return PTR_ERR(task);
4908         ret = nfs4_wait_for_completion_rpc_task(task);
4909         if (ret == 0) {
4910                 ret = data->rpc_status;
4911                 if (ret)
4912                         nfs4_handle_setlk_error(data->server, data->lsp,
4913                                         data->arg.new_lock_owner, ret);
4914         } else
4915                 data->cancelled = 1;
4916         rpc_put_task(task);
4917         dprintk("%s: done, ret = %d!\n", __func__, ret);
4918         return ret;
4919 }
4920
4921 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4922 {
4923         struct nfs_server *server = NFS_SERVER(state->inode);
4924         struct nfs4_exception exception = {
4925                 .inode = state->inode,
4926         };
4927         int err;
4928
4929         do {
4930                 /* Cache the lock if possible... */
4931                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4932                         return 0;
4933                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4934                 if (err != -NFS4ERR_DELAY)
4935                         break;
4936                 nfs4_handle_exception(server, err, &exception);
4937         } while (exception.retry);
4938         return err;
4939 }
4940
4941 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4942 {
4943         struct nfs_server *server = NFS_SERVER(state->inode);
4944         struct nfs4_exception exception = {
4945                 .inode = state->inode,
4946         };
4947         int err;
4948
4949         err = nfs4_set_lock_state(state, request);
4950         if (err != 0)
4951                 return err;
4952         do {
4953                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4954                         return 0;
4955                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4956                 switch (err) {
4957                 default:
4958                         goto out;
4959                 case -NFS4ERR_GRACE:
4960                 case -NFS4ERR_DELAY:
4961                         nfs4_handle_exception(server, err, &exception);
4962                         err = 0;
4963                 }
4964         } while (exception.retry);
4965 out:
4966         return err;
4967 }
4968
4969 #if defined(CONFIG_NFS_V4_1)
4970 /**
4971  * nfs41_check_expired_locks - possibly free a lock stateid
4972  *
4973  * @state: NFSv4 state for an inode
4974  *
4975  * Returns NFS_OK if recovery for this stateid is now finished.
4976  * Otherwise a negative NFS4ERR value is returned.
4977  */
4978 static int nfs41_check_expired_locks(struct nfs4_state *state)
4979 {
4980         int status, ret = -NFS4ERR_BAD_STATEID;
4981         struct nfs4_lock_state *lsp;
4982         struct nfs_server *server = NFS_SERVER(state->inode);
4983
4984         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4985                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4986                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4987                         if (status != NFS_OK) {
4988                                 /* Free the stateid unless the server
4989                                  * informs us the stateid is unrecognized. */
4990                                 if (status != -NFS4ERR_BAD_STATEID)
4991                                         nfs41_free_stateid(server,
4992                                                         &lsp->ls_stateid);
4993                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4994                                 ret = status;
4995                         }
4996                 }
4997         };
4998
4999         return ret;
5000 }
5001
5002 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5003 {
5004         int status = NFS_OK;
5005
5006         if (test_bit(LK_STATE_IN_USE, &state->flags))
5007                 status = nfs41_check_expired_locks(state);
5008         if (status != NFS_OK)
5009                 status = nfs4_lock_expired(state, request);
5010         return status;
5011 }
5012 #endif
5013
5014 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5015 {
5016         struct nfs4_state_owner *sp = state->owner;
5017         struct nfs_inode *nfsi = NFS_I(state->inode);
5018         unsigned char fl_flags = request->fl_flags;
5019         unsigned int seq;
5020         int status = -ENOLCK;
5021
5022         if ((fl_flags & FL_POSIX) &&
5023                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5024                 goto out;
5025         /* Is this a delegated open? */
5026         status = nfs4_set_lock_state(state, request);
5027         if (status != 0)
5028                 goto out;
5029         request->fl_flags |= FL_ACCESS;
5030         status = do_vfs_lock(request->fl_file, request);
5031         if (status < 0)
5032                 goto out;
5033         down_read(&nfsi->rwsem);
5034         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5035                 /* Yes: cache locks! */
5036                 /* ...but avoid races with delegation recall... */
5037                 request->fl_flags = fl_flags & ~FL_SLEEP;
5038                 status = do_vfs_lock(request->fl_file, request);
5039                 goto out_unlock;
5040         }
5041         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5042         up_read(&nfsi->rwsem);
5043         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5044         if (status != 0)
5045                 goto out;
5046         down_read(&nfsi->rwsem);
5047         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5048                 status = -NFS4ERR_DELAY;
5049                 goto out_unlock;
5050         }
5051         /* Note: we always want to sleep here! */
5052         request->fl_flags = fl_flags | FL_SLEEP;
5053         if (do_vfs_lock(request->fl_file, request) < 0)
5054                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5055                         "manager!\n", __func__);
5056 out_unlock:
5057         up_read(&nfsi->rwsem);
5058 out:
5059         request->fl_flags = fl_flags;
5060         return status;
5061 }
5062
5063 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5064 {
5065         struct nfs4_exception exception = {
5066                 .state = state,
5067                 .inode = state->inode,
5068         };
5069         int err;
5070
5071         do {
5072                 err = _nfs4_proc_setlk(state, cmd, request);
5073                 if (err == -NFS4ERR_DENIED)
5074                         err = -EAGAIN;
5075                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5076                                 err, &exception);
5077         } while (exception.retry);
5078         return err;
5079 }
5080
5081 static int
5082 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5083 {
5084         struct nfs_open_context *ctx;
5085         struct nfs4_state *state;
5086         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5087         int status;
5088
5089         /* verify open state */
5090         ctx = nfs_file_open_context(filp);
5091         state = ctx->state;
5092
5093         if (request->fl_start < 0 || request->fl_end < 0)
5094                 return -EINVAL;
5095
5096         if (IS_GETLK(cmd)) {
5097                 if (state != NULL)
5098                         return nfs4_proc_getlk(state, F_GETLK, request);
5099                 return 0;
5100         }
5101
5102         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5103                 return -EINVAL;
5104
5105         if (request->fl_type == F_UNLCK) {
5106                 if (state != NULL)
5107                         return nfs4_proc_unlck(state, cmd, request);
5108                 return 0;
5109         }
5110
5111         if (state == NULL)
5112                 return -ENOLCK;
5113         /*
5114          * Don't rely on the VFS having checked the file open mode,
5115          * since it won't do this for flock() locks.
5116          */
5117         switch (request->fl_type) {
5118         case F_RDLCK:
5119                 if (!(filp->f_mode & FMODE_READ))
5120                         return -EBADF;
5121                 break;
5122         case F_WRLCK:
5123                 if (!(filp->f_mode & FMODE_WRITE))
5124                         return -EBADF;
5125         }
5126
5127         do {
5128                 status = nfs4_proc_setlk(state, cmd, request);
5129                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5130                         break;
5131                 timeout = nfs4_set_lock_task_retry(timeout);
5132                 status = -ERESTARTSYS;
5133                 if (signalled())
5134                         break;
5135         } while(status < 0);
5136         return status;
5137 }
5138
5139 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5140 {
5141         struct nfs_server *server = NFS_SERVER(state->inode);
5142         int err;
5143
5144         err = nfs4_set_lock_state(state, fl);
5145         if (err != 0)
5146                 return err;
5147         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5148         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5149 }
5150
5151 struct nfs_release_lockowner_data {
5152         struct nfs4_lock_state *lsp;
5153         struct nfs_server *server;
5154         struct nfs_release_lockowner_args args;
5155 };
5156
5157 static void nfs4_release_lockowner_release(void *calldata)
5158 {
5159         struct nfs_release_lockowner_data *data = calldata;
5160         nfs4_free_lock_state(data->server, data->lsp);
5161         kfree(calldata);
5162 }
5163
5164 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5165         .rpc_release = nfs4_release_lockowner_release,
5166 };
5167
5168 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5169 {
5170         struct nfs_server *server = lsp->ls_state->owner->so_server;
5171         struct nfs_release_lockowner_data *data;
5172         struct rpc_message msg = {
5173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5174         };
5175
5176         if (server->nfs_client->cl_mvops->minor_version != 0)
5177                 return -EINVAL;
5178         data = kmalloc(sizeof(*data), GFP_NOFS);
5179         if (!data)
5180                 return -ENOMEM;
5181         data->lsp = lsp;
5182         data->server = server;
5183         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5184         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5185         data->args.lock_owner.s_dev = server->s_dev;
5186         msg.rpc_argp = &data->args;
5187         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5188         return 0;
5189 }
5190
5191 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5192
5193 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5194                                    const void *buf, size_t buflen,
5195                                    int flags, int type)
5196 {
5197         if (strcmp(key, "") != 0)
5198                 return -EINVAL;
5199
5200         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5201 }
5202
5203 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5204                                    void *buf, size_t buflen, int type)
5205 {
5206         if (strcmp(key, "") != 0)
5207                 return -EINVAL;
5208
5209         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5210 }
5211
5212 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5213                                        size_t list_len, const char *name,
5214                                        size_t name_len, int type)
5215 {
5216         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5217
5218         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5219                 return 0;
5220
5221         if (list && len <= list_len)
5222                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5223         return len;
5224 }
5225
5226 /*
5227  * nfs_fhget will use either the mounted_on_fileid or the fileid
5228  */
5229 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5230 {
5231         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5232                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5233               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5234               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5235                 return;
5236
5237         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5238                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5239         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5240         fattr->nlink = 2;
5241 }
5242
5243 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5244                                    const struct qstr *name,
5245                                    struct nfs4_fs_locations *fs_locations,
5246                                    struct page *page)
5247 {
5248         struct nfs_server *server = NFS_SERVER(dir);
5249         u32 bitmask[2] = {
5250                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5251         };
5252         struct nfs4_fs_locations_arg args = {
5253                 .dir_fh = NFS_FH(dir),
5254                 .name = name,
5255                 .page = page,
5256                 .bitmask = bitmask,
5257         };
5258         struct nfs4_fs_locations_res res = {
5259                 .fs_locations = fs_locations,
5260         };
5261         struct rpc_message msg = {
5262                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5263                 .rpc_argp = &args,
5264                 .rpc_resp = &res,
5265         };
5266         int status;
5267
5268         dprintk("%s: start\n", __func__);
5269
5270         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5271          * is not supported */
5272         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5273                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5274         else
5275                 bitmask[0] |= FATTR4_WORD0_FILEID;
5276
5277         nfs_fattr_init(&fs_locations->fattr);
5278         fs_locations->server = server;
5279         fs_locations->nlocations = 0;
5280         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5281         dprintk("%s: returned status = %d\n", __func__, status);
5282         return status;
5283 }
5284
5285 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5286                            const struct qstr *name,
5287                            struct nfs4_fs_locations *fs_locations,
5288                            struct page *page)
5289 {
5290         struct nfs4_exception exception = { };
5291         int err;
5292         do {
5293                 err = nfs4_handle_exception(NFS_SERVER(dir),
5294                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5295                                 &exception);
5296         } while (exception.retry);
5297         return err;
5298 }
5299
5300 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5301 {
5302         int status;
5303         struct nfs4_secinfo_arg args = {
5304                 .dir_fh = NFS_FH(dir),
5305                 .name   = name,
5306         };
5307         struct nfs4_secinfo_res res = {
5308                 .flavors     = flavors,
5309         };
5310         struct rpc_message msg = {
5311                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5312                 .rpc_argp = &args,
5313                 .rpc_resp = &res,
5314         };
5315
5316         dprintk("NFS call  secinfo %s\n", name->name);
5317         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5318         dprintk("NFS reply  secinfo: %d\n", status);
5319         return status;
5320 }
5321
5322 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5323                       struct nfs4_secinfo_flavors *flavors)
5324 {
5325         struct nfs4_exception exception = { };
5326         int err;
5327         do {
5328                 err = nfs4_handle_exception(NFS_SERVER(dir),
5329                                 _nfs4_proc_secinfo(dir, name, flavors),
5330                                 &exception);
5331         } while (exception.retry);
5332         return err;
5333 }
5334
5335 #ifdef CONFIG_NFS_V4_1
5336 /*
5337  * Check the exchange flags returned by the server for invalid flags, having
5338  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5339  * DS flags set.
5340  */
5341 static int nfs4_check_cl_exchange_flags(u32 flags)
5342 {
5343         if (flags & ~EXCHGID4_FLAG_MASK_R)
5344                 goto out_inval;
5345         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5346             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5347                 goto out_inval;
5348         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5349                 goto out_inval;
5350         return NFS_OK;
5351 out_inval:
5352         return -NFS4ERR_INVAL;
5353 }
5354
5355 static bool
5356 nfs41_same_server_scope(struct nfs41_server_scope *a,
5357                         struct nfs41_server_scope *b)
5358 {
5359         if (a->server_scope_sz == b->server_scope_sz &&
5360             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5361                 return true;
5362
5363         return false;
5364 }
5365
5366 /*
5367  * nfs4_proc_bind_conn_to_session()
5368  *
5369  * The 4.1 client currently uses the same TCP connection for the
5370  * fore and backchannel.
5371  */
5372 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5373 {
5374         int status;
5375         struct nfs41_bind_conn_to_session_res res;
5376         struct rpc_message msg = {
5377                 .rpc_proc =
5378                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5379                 .rpc_argp = clp,
5380                 .rpc_resp = &res,
5381                 .rpc_cred = cred,
5382         };
5383
5384         dprintk("--> %s\n", __func__);
5385
5386         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5387         if (unlikely(res.session == NULL)) {
5388                 status = -ENOMEM;
5389                 goto out;
5390         }
5391
5392         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5393         if (status == 0) {
5394                 if (memcmp(res.session->sess_id.data,
5395                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5396                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5397                         status = -EIO;
5398                         goto out_session;
5399                 }
5400                 if (res.dir != NFS4_CDFS4_BOTH) {
5401                         dprintk("NFS: %s: Unexpected direction from server\n",
5402                                 __func__);
5403                         status = -EIO;
5404                         goto out_session;
5405                 }
5406                 if (res.use_conn_in_rdma_mode) {
5407                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5408                                 __func__);
5409                         status = -EIO;
5410                         goto out_session;
5411                 }
5412         }
5413 out_session:
5414         kfree(res.session);
5415 out:
5416         dprintk("<-- %s status= %d\n", __func__, status);
5417         return status;
5418 }
5419
5420 /*
5421  * nfs4_proc_exchange_id()
5422  *
5423  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5424  *
5425  * Since the clientid has expired, all compounds using sessions
5426  * associated with the stale clientid will be returning
5427  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5428  * be in some phase of session reset.
5429  */
5430 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5431 {
5432         nfs4_verifier verifier;
5433         struct nfs41_exchange_id_args args = {
5434                 .verifier = &verifier,
5435                 .client = clp,
5436                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5437         };
5438         struct nfs41_exchange_id_res res = {
5439                 0
5440         };
5441         int status;
5442         struct rpc_message msg = {
5443                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5444                 .rpc_argp = &args,
5445                 .rpc_resp = &res,
5446                 .rpc_cred = cred,
5447         };
5448
5449         nfs4_init_boot_verifier(clp, &verifier);
5450         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5451                                                         sizeof(args.id));
5452         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5453                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5454                 args.id_len, args.id);
5455
5456         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5457                                         GFP_NOFS);
5458         if (unlikely(res.server_owner == NULL)) {
5459                 status = -ENOMEM;
5460                 goto out;
5461         }
5462
5463         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5464                                         GFP_NOFS);
5465         if (unlikely(res.server_scope == NULL)) {
5466                 status = -ENOMEM;
5467                 goto out_server_owner;
5468         }
5469
5470         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5471         if (unlikely(res.impl_id == NULL)) {
5472                 status = -ENOMEM;
5473                 goto out_server_scope;
5474         }
5475
5476         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5477         if (status == 0)
5478                 status = nfs4_check_cl_exchange_flags(res.flags);
5479
5480         if (status == 0) {
5481                 clp->cl_clientid = res.clientid;
5482                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5483                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5484                         clp->cl_seqid = res.seqid;
5485
5486                 kfree(clp->cl_serverowner);
5487                 clp->cl_serverowner = res.server_owner;
5488                 res.server_owner = NULL;
5489
5490                 /* use the most recent implementation id */
5491                 kfree(clp->cl_implid);
5492                 clp->cl_implid = res.impl_id;
5493
5494                 if (clp->cl_serverscope != NULL &&
5495                     !nfs41_same_server_scope(clp->cl_serverscope,
5496                                              res.server_scope)) {
5497                         dprintk("%s: server_scope mismatch detected\n",
5498                                 __func__);
5499                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5500                         kfree(clp->cl_serverscope);
5501                         clp->cl_serverscope = NULL;
5502                 }
5503
5504                 if (clp->cl_serverscope == NULL) {
5505                         clp->cl_serverscope = res.server_scope;
5506                         goto out;
5507                 }
5508         } else
5509                 kfree(res.impl_id);
5510
5511 out_server_owner:
5512         kfree(res.server_owner);
5513 out_server_scope:
5514         kfree(res.server_scope);
5515 out:
5516         if (clp->cl_implid != NULL)
5517                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5518                         "domain: %s, name: %s, date: %llu,%u\n",
5519                         clp->cl_implid->domain, clp->cl_implid->name,
5520                         clp->cl_implid->date.seconds,
5521                         clp->cl_implid->date.nseconds);
5522         dprintk("NFS reply exchange_id: %d\n", status);
5523         return status;
5524 }
5525
5526 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5527                 struct rpc_cred *cred)
5528 {
5529         struct rpc_message msg = {
5530                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5531                 .rpc_argp = clp,
5532                 .rpc_cred = cred,
5533         };
5534         int status;
5535
5536         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5537         if (status)
5538                 dprintk("NFS: Got error %d from the server %s on "
5539                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5540         return status;
5541 }
5542
5543 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5544                 struct rpc_cred *cred)
5545 {
5546         unsigned int loop;
5547         int ret;
5548
5549         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5550                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5551                 switch (ret) {
5552                 case -NFS4ERR_DELAY:
5553                 case -NFS4ERR_CLIENTID_BUSY:
5554                         ssleep(1);
5555                         break;
5556                 default:
5557                         return ret;
5558                 }
5559         }
5560         return 0;
5561 }
5562
5563 int nfs4_destroy_clientid(struct nfs_client *clp)
5564 {
5565         struct rpc_cred *cred;
5566         int ret = 0;
5567
5568         if (clp->cl_mvops->minor_version < 1)
5569                 goto out;
5570         if (clp->cl_exchange_flags == 0)
5571                 goto out;
5572         if (clp->cl_preserve_clid)
5573                 goto out;
5574         cred = nfs4_get_exchange_id_cred(clp);
5575         ret = nfs4_proc_destroy_clientid(clp, cred);
5576         if (cred)
5577                 put_rpccred(cred);
5578         switch (ret) {
5579         case 0:
5580         case -NFS4ERR_STALE_CLIENTID:
5581                 clp->cl_exchange_flags = 0;
5582         }
5583 out:
5584         return ret;
5585 }
5586
5587 struct nfs4_get_lease_time_data {
5588         struct nfs4_get_lease_time_args *args;
5589         struct nfs4_get_lease_time_res *res;
5590         struct nfs_client *clp;
5591 };
5592
5593 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5594                                         void *calldata)
5595 {
5596         struct nfs4_get_lease_time_data *data =
5597                         (struct nfs4_get_lease_time_data *)calldata;
5598
5599         dprintk("--> %s\n", __func__);
5600         /* just setup sequence, do not trigger session recovery
5601            since we're invoked within one */
5602         nfs41_setup_sequence(data->clp->cl_session,
5603                         &data->args->la_seq_args,
5604                         &data->res->lr_seq_res,
5605                         task);
5606         dprintk("<-- %s\n", __func__);
5607 }
5608
5609 /*
5610  * Called from nfs4_state_manager thread for session setup, so don't recover
5611  * from sequence operation or clientid errors.
5612  */
5613 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5614 {
5615         struct nfs4_get_lease_time_data *data =
5616                         (struct nfs4_get_lease_time_data *)calldata;
5617
5618         dprintk("--> %s\n", __func__);
5619         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5620                 return;
5621         switch (task->tk_status) {
5622         case -NFS4ERR_DELAY:
5623         case -NFS4ERR_GRACE:
5624                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5625                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5626                 task->tk_status = 0;
5627                 /* fall through */
5628         case -NFS4ERR_RETRY_UNCACHED_REP:
5629                 rpc_restart_call_prepare(task);
5630                 return;
5631         }
5632         dprintk("<-- %s\n", __func__);
5633 }
5634
5635 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5636         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5637         .rpc_call_done = nfs4_get_lease_time_done,
5638 };
5639
5640 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5641 {
5642         struct rpc_task *task;
5643         struct nfs4_get_lease_time_args args;
5644         struct nfs4_get_lease_time_res res = {
5645                 .lr_fsinfo = fsinfo,
5646         };
5647         struct nfs4_get_lease_time_data data = {
5648                 .args = &args,
5649                 .res = &res,
5650                 .clp = clp,
5651         };
5652         struct rpc_message msg = {
5653                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5654                 .rpc_argp = &args,
5655                 .rpc_resp = &res,
5656         };
5657         struct rpc_task_setup task_setup = {
5658                 .rpc_client = clp->cl_rpcclient,
5659                 .rpc_message = &msg,
5660                 .callback_ops = &nfs4_get_lease_time_ops,
5661                 .callback_data = &data,
5662                 .flags = RPC_TASK_TIMEOUT,
5663         };
5664         int status;
5665
5666         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5667         nfs4_set_sequence_privileged(&args.la_seq_args);
5668         dprintk("--> %s\n", __func__);
5669         task = rpc_run_task(&task_setup);
5670
5671         if (IS_ERR(task))
5672                 status = PTR_ERR(task);
5673         else {
5674                 status = task->tk_status;
5675                 rpc_put_task(task);
5676         }
5677         dprintk("<-- %s return %d\n", __func__, status);
5678
5679         return status;
5680 }
5681
5682 /*
5683  * Initialize the values to be used by the client in CREATE_SESSION
5684  * If nfs4_init_session set the fore channel request and response sizes,
5685  * use them.
5686  *
5687  * Set the back channel max_resp_sz_cached to zero to force the client to
5688  * always set csa_cachethis to FALSE because the current implementation
5689  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5690  */
5691 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5692 {
5693         struct nfs4_session *session = args->client->cl_session;
5694         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5695                      mxresp_sz = session->fc_target_max_resp_sz;
5696
5697         if (mxrqst_sz == 0)
5698                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5699         if (mxresp_sz == 0)
5700                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5701         /* Fore channel attributes */
5702         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5703         args->fc_attrs.max_resp_sz = mxresp_sz;
5704         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5705         args->fc_attrs.max_reqs = max_session_slots;
5706
5707         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5708                 "max_ops=%u max_reqs=%u\n",
5709                 __func__,
5710                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5711                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5712
5713         /* Back channel attributes */
5714         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5715         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5716         args->bc_attrs.max_resp_sz_cached = 0;
5717         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5718         args->bc_attrs.max_reqs = 1;
5719
5720         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5721                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5722                 __func__,
5723                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5724                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5725                 args->bc_attrs.max_reqs);
5726 }
5727
5728 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5729 {
5730         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5731         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5732
5733         if (rcvd->max_resp_sz > sent->max_resp_sz)
5734                 return -EINVAL;
5735         /*
5736          * Our requested max_ops is the minimum we need; we're not
5737          * prepared to break up compounds into smaller pieces than that.
5738          * So, no point even trying to continue if the server won't
5739          * cooperate:
5740          */
5741         if (rcvd->max_ops < sent->max_ops)
5742                 return -EINVAL;
5743         if (rcvd->max_reqs == 0)
5744                 return -EINVAL;
5745         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5746                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5747         return 0;
5748 }
5749
5750 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5751 {
5752         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5753         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5754
5755         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5756                 return -EINVAL;
5757         if (rcvd->max_resp_sz < sent->max_resp_sz)
5758                 return -EINVAL;
5759         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5760                 return -EINVAL;
5761         /* These would render the backchannel useless: */
5762         if (rcvd->max_ops != sent->max_ops)
5763                 return -EINVAL;
5764         if (rcvd->max_reqs != sent->max_reqs)
5765                 return -EINVAL;
5766         return 0;
5767 }
5768
5769 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5770                                      struct nfs4_session *session)
5771 {
5772         int ret;
5773
5774         ret = nfs4_verify_fore_channel_attrs(args, session);
5775         if (ret)
5776                 return ret;
5777         return nfs4_verify_back_channel_attrs(args, session);
5778 }
5779
5780 static int _nfs4_proc_create_session(struct nfs_client *clp,
5781                 struct rpc_cred *cred)
5782 {
5783         struct nfs4_session *session = clp->cl_session;
5784         struct nfs41_create_session_args args = {
5785                 .client = clp,
5786                 .cb_program = NFS4_CALLBACK,
5787         };
5788         struct nfs41_create_session_res res = {
5789                 .client = clp,
5790         };
5791         struct rpc_message msg = {
5792                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5793                 .rpc_argp = &args,
5794                 .rpc_resp = &res,
5795                 .rpc_cred = cred,
5796         };
5797         int status;
5798
5799         nfs4_init_channel_attrs(&args);
5800         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5801
5802         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5803
5804         if (!status) {
5805                 /* Verify the session's negotiated channel_attrs values */
5806                 status = nfs4_verify_channel_attrs(&args, session);
5807                 /* Increment the clientid slot sequence id */
5808                 clp->cl_seqid++;
5809         }
5810
5811         return status;
5812 }
5813
5814 /*
5815  * Issues a CREATE_SESSION operation to the server.
5816  * It is the responsibility of the caller to verify the session is
5817  * expired before calling this routine.
5818  */
5819 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5820 {
5821         int status;
5822         unsigned *ptr;
5823         struct nfs4_session *session = clp->cl_session;
5824
5825         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5826
5827         status = _nfs4_proc_create_session(clp, cred);
5828         if (status)
5829                 goto out;
5830
5831         /* Init or reset the session slot tables */
5832         status = nfs4_setup_session_slot_tables(session);
5833         dprintk("slot table setup returned %d\n", status);
5834         if (status)
5835                 goto out;
5836
5837         ptr = (unsigned *)&session->sess_id.data[0];
5838         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5839                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5840 out:
5841         dprintk("<-- %s\n", __func__);
5842         return status;
5843 }
5844
5845 /*
5846  * Issue the over-the-wire RPC DESTROY_SESSION.
5847  * The caller must serialize access to this routine.
5848  */
5849 int nfs4_proc_destroy_session(struct nfs4_session *session,
5850                 struct rpc_cred *cred)
5851 {
5852         struct rpc_message msg = {
5853                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5854                 .rpc_argp = session,
5855                 .rpc_cred = cred,
5856         };
5857         int status = 0;
5858
5859         dprintk("--> nfs4_proc_destroy_session\n");
5860
5861         /* session is still being setup */
5862         if (session->clp->cl_cons_state != NFS_CS_READY)
5863                 return status;
5864
5865         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5866
5867         if (status)
5868                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5869                         "Session has been destroyed regardless...\n", status);
5870
5871         dprintk("<-- nfs4_proc_destroy_session\n");
5872         return status;
5873 }
5874
5875 /*
5876  * Renew the cl_session lease.
5877  */
5878 struct nfs4_sequence_data {
5879         struct nfs_client *clp;
5880         struct nfs4_sequence_args args;
5881         struct nfs4_sequence_res res;
5882 };
5883
5884 static void nfs41_sequence_release(void *data)
5885 {
5886         struct nfs4_sequence_data *calldata = data;
5887         struct nfs_client *clp = calldata->clp;
5888
5889         if (atomic_read(&clp->cl_count) > 1)
5890                 nfs4_schedule_state_renewal(clp);
5891         nfs_put_client(clp);
5892         kfree(calldata);
5893 }
5894
5895 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5896 {
5897         switch(task->tk_status) {
5898         case -NFS4ERR_DELAY:
5899                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5900                 return -EAGAIN;
5901         default:
5902                 nfs4_schedule_lease_recovery(clp);
5903         }
5904         return 0;
5905 }
5906
5907 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5908 {
5909         struct nfs4_sequence_data *calldata = data;
5910         struct nfs_client *clp = calldata->clp;
5911
5912         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5913                 return;
5914
5915         if (task->tk_status < 0) {
5916                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5917                 if (atomic_read(&clp->cl_count) == 1)
5918                         goto out;
5919
5920                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5921                         rpc_restart_call_prepare(task);
5922                         return;
5923                 }
5924         }
5925         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5926 out:
5927         dprintk("<-- %s\n", __func__);
5928 }
5929
5930 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5931 {
5932         struct nfs4_sequence_data *calldata = data;
5933         struct nfs_client *clp = calldata->clp;
5934         struct nfs4_sequence_args *args;
5935         struct nfs4_sequence_res *res;
5936
5937         args = task->tk_msg.rpc_argp;
5938         res = task->tk_msg.rpc_resp;
5939
5940         nfs41_setup_sequence(clp->cl_session, args, res, task);
5941 }
5942
5943 static const struct rpc_call_ops nfs41_sequence_ops = {
5944         .rpc_call_done = nfs41_sequence_call_done,
5945         .rpc_call_prepare = nfs41_sequence_prepare,
5946         .rpc_release = nfs41_sequence_release,
5947 };
5948
5949 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5950                 struct rpc_cred *cred,
5951                 bool is_privileged)
5952 {
5953         struct nfs4_sequence_data *calldata;
5954         struct rpc_message msg = {
5955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5956                 .rpc_cred = cred,
5957         };
5958         struct rpc_task_setup task_setup_data = {
5959                 .rpc_client = clp->cl_rpcclient,
5960                 .rpc_message = &msg,
5961                 .callback_ops = &nfs41_sequence_ops,
5962                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5963         };
5964
5965         if (!atomic_inc_not_zero(&clp->cl_count))
5966                 return ERR_PTR(-EIO);
5967         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5968         if (calldata == NULL) {
5969                 nfs_put_client(clp);
5970                 return ERR_PTR(-ENOMEM);
5971         }
5972         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5973         if (is_privileged)
5974                 nfs4_set_sequence_privileged(&calldata->args);
5975         msg.rpc_argp = &calldata->args;
5976         msg.rpc_resp = &calldata->res;
5977         calldata->clp = clp;
5978         task_setup_data.callback_data = calldata;
5979
5980         return rpc_run_task(&task_setup_data);
5981 }
5982
5983 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5984 {
5985         struct rpc_task *task;
5986         int ret = 0;
5987
5988         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5989                 return 0;
5990         task = _nfs41_proc_sequence(clp, cred, false);
5991         if (IS_ERR(task))
5992                 ret = PTR_ERR(task);
5993         else
5994                 rpc_put_task_async(task);
5995         dprintk("<-- %s status=%d\n", __func__, ret);
5996         return ret;
5997 }
5998
5999 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6000 {
6001         struct rpc_task *task;
6002         int ret;
6003
6004         task = _nfs41_proc_sequence(clp, cred, true);
6005         if (IS_ERR(task)) {
6006                 ret = PTR_ERR(task);
6007                 goto out;
6008         }
6009         ret = rpc_wait_for_completion_task(task);
6010         if (!ret) {
6011                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6012
6013                 if (task->tk_status == 0)
6014                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6015                 ret = task->tk_status;
6016         }
6017         rpc_put_task(task);
6018 out:
6019         dprintk("<-- %s status=%d\n", __func__, ret);
6020         return ret;
6021 }
6022
6023 struct nfs4_reclaim_complete_data {
6024         struct nfs_client *clp;
6025         struct nfs41_reclaim_complete_args arg;
6026         struct nfs41_reclaim_complete_res res;
6027 };
6028
6029 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6030 {
6031         struct nfs4_reclaim_complete_data *calldata = data;
6032
6033         nfs41_setup_sequence(calldata->clp->cl_session,
6034                         &calldata->arg.seq_args,
6035                         &calldata->res.seq_res,
6036                         task);
6037 }
6038
6039 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6040 {
6041         switch(task->tk_status) {
6042         case 0:
6043         case -NFS4ERR_COMPLETE_ALREADY:
6044         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6045                 break;
6046         case -NFS4ERR_DELAY:
6047                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6048                 /* fall through */
6049         case -NFS4ERR_RETRY_UNCACHED_REP:
6050                 return -EAGAIN;
6051         default:
6052                 nfs4_schedule_lease_recovery(clp);
6053         }
6054         return 0;
6055 }
6056
6057 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6058 {
6059         struct nfs4_reclaim_complete_data *calldata = data;
6060         struct nfs_client *clp = calldata->clp;
6061         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6062
6063         dprintk("--> %s\n", __func__);
6064         if (!nfs41_sequence_done(task, res))
6065                 return;
6066
6067         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6068                 rpc_restart_call_prepare(task);
6069                 return;
6070         }
6071         dprintk("<-- %s\n", __func__);
6072 }
6073
6074 static void nfs4_free_reclaim_complete_data(void *data)
6075 {
6076         struct nfs4_reclaim_complete_data *calldata = data;
6077
6078         kfree(calldata);
6079 }
6080
6081 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6082         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6083         .rpc_call_done = nfs4_reclaim_complete_done,
6084         .rpc_release = nfs4_free_reclaim_complete_data,
6085 };
6086
6087 /*
6088  * Issue a global reclaim complete.
6089  */
6090 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6091 {
6092         struct nfs4_reclaim_complete_data *calldata;
6093         struct rpc_task *task;
6094         struct rpc_message msg = {
6095                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6096         };
6097         struct rpc_task_setup task_setup_data = {
6098                 .rpc_client = clp->cl_rpcclient,
6099                 .rpc_message = &msg,
6100                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6101                 .flags = RPC_TASK_ASYNC,
6102         };
6103         int status = -ENOMEM;
6104
6105         dprintk("--> %s\n", __func__);
6106         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6107         if (calldata == NULL)
6108                 goto out;
6109         calldata->clp = clp;
6110         calldata->arg.one_fs = 0;
6111
6112         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6113         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6114         msg.rpc_argp = &calldata->arg;
6115         msg.rpc_resp = &calldata->res;
6116         task_setup_data.callback_data = calldata;
6117         task = rpc_run_task(&task_setup_data);
6118         if (IS_ERR(task)) {
6119                 status = PTR_ERR(task);
6120                 goto out;
6121         }
6122         status = nfs4_wait_for_completion_rpc_task(task);
6123         if (status == 0)
6124                 status = task->tk_status;
6125         rpc_put_task(task);
6126         return 0;
6127 out:
6128         dprintk("<-- %s status=%d\n", __func__, status);
6129         return status;
6130 }
6131
6132 static void
6133 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6134 {
6135         struct nfs4_layoutget *lgp = calldata;
6136         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6137         struct nfs4_session *session = nfs4_get_session(server);
6138
6139         dprintk("--> %s\n", __func__);
6140         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6141          * right now covering the LAYOUTGET we are about to send.
6142          * However, that is not so catastrophic, and there seems
6143          * to be no way to prevent it completely.
6144          */
6145         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6146                                 &lgp->res.seq_res, task))
6147                 return;
6148         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6149                                           NFS_I(lgp->args.inode)->layout,
6150                                           lgp->args.ctx->state)) {
6151                 rpc_exit(task, NFS4_OK);
6152         }
6153 }
6154
6155 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6156 {
6157         struct nfs4_layoutget *lgp = calldata;
6158         struct inode *inode = lgp->args.inode;
6159         struct nfs_server *server = NFS_SERVER(inode);
6160         struct pnfs_layout_hdr *lo;
6161         struct nfs4_state *state = NULL;
6162         unsigned long timeo, giveup;
6163
6164         dprintk("--> %s\n", __func__);
6165
6166         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6167                 goto out;
6168
6169         switch (task->tk_status) {
6170         case 0:
6171                 goto out;
6172         case -NFS4ERR_LAYOUTTRYLATER:
6173         case -NFS4ERR_RECALLCONFLICT:
6174                 timeo = rpc_get_timeout(task->tk_client);
6175                 giveup = lgp->args.timestamp + timeo;
6176                 if (time_after(giveup, jiffies))
6177                         task->tk_status = -NFS4ERR_DELAY;
6178                 break;
6179         case -NFS4ERR_EXPIRED:
6180         case -NFS4ERR_BAD_STATEID:
6181                 spin_lock(&inode->i_lock);
6182                 lo = NFS_I(inode)->layout;
6183                 if (!lo || list_empty(&lo->plh_segs)) {
6184                         spin_unlock(&inode->i_lock);
6185                         /* If the open stateid was bad, then recover it. */
6186                         state = lgp->args.ctx->state;
6187                 } else {
6188                         LIST_HEAD(head);
6189
6190                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6191                         spin_unlock(&inode->i_lock);
6192                         /* Mark the bad layout state as invalid, then
6193                          * retry using the open stateid. */
6194                         pnfs_free_lseg_list(&head);
6195                 }
6196         }
6197         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6198                 rpc_restart_call_prepare(task);
6199 out:
6200         dprintk("<-- %s\n", __func__);
6201 }
6202
6203 static size_t max_response_pages(struct nfs_server *server)
6204 {
6205         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6206         return nfs_page_array_len(0, max_resp_sz);
6207 }
6208
6209 static void nfs4_free_pages(struct page **pages, size_t size)
6210 {
6211         int i;
6212
6213         if (!pages)
6214                 return;
6215
6216         for (i = 0; i < size; i++) {
6217                 if (!pages[i])
6218                         break;
6219                 __free_page(pages[i]);
6220         }
6221         kfree(pages);
6222 }
6223
6224 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6225 {
6226         struct page **pages;
6227         int i;
6228
6229         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6230         if (!pages) {
6231                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6232                 return NULL;
6233         }
6234
6235         for (i = 0; i < size; i++) {
6236                 pages[i] = alloc_page(gfp_flags);
6237                 if (!pages[i]) {
6238                         dprintk("%s: failed to allocate page\n", __func__);
6239                         nfs4_free_pages(pages, size);
6240                         return NULL;
6241                 }
6242         }
6243
6244         return pages;
6245 }
6246
6247 static void nfs4_layoutget_release(void *calldata)
6248 {
6249         struct nfs4_layoutget *lgp = calldata;
6250         struct inode *inode = lgp->args.inode;
6251         struct nfs_server *server = NFS_SERVER(inode);
6252         size_t max_pages = max_response_pages(server);
6253
6254         dprintk("--> %s\n", __func__);
6255         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6256         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6257         put_nfs_open_context(lgp->args.ctx);
6258         kfree(calldata);
6259         dprintk("<-- %s\n", __func__);
6260 }
6261
6262 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6263         .rpc_call_prepare = nfs4_layoutget_prepare,
6264         .rpc_call_done = nfs4_layoutget_done,
6265         .rpc_release = nfs4_layoutget_release,
6266 };
6267
6268 struct pnfs_layout_segment *
6269 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6270 {
6271         struct inode *inode = lgp->args.inode;
6272         struct nfs_server *server = NFS_SERVER(inode);
6273         size_t max_pages = max_response_pages(server);
6274         struct rpc_task *task;
6275         struct rpc_message msg = {
6276                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6277                 .rpc_argp = &lgp->args,
6278                 .rpc_resp = &lgp->res,
6279         };
6280         struct rpc_task_setup task_setup_data = {
6281                 .rpc_client = server->client,
6282                 .rpc_message = &msg,
6283                 .callback_ops = &nfs4_layoutget_call_ops,
6284                 .callback_data = lgp,
6285                 .flags = RPC_TASK_ASYNC,
6286         };
6287         struct pnfs_layout_segment *lseg = NULL;
6288         int status = 0;
6289
6290         dprintk("--> %s\n", __func__);
6291
6292         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6293         if (!lgp->args.layout.pages) {
6294                 nfs4_layoutget_release(lgp);
6295                 return ERR_PTR(-ENOMEM);
6296         }
6297         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6298         lgp->args.timestamp = jiffies;
6299
6300         lgp->res.layoutp = &lgp->args.layout;
6301         lgp->res.seq_res.sr_slot = NULL;
6302         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6303
6304         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6305         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6306
6307         task = rpc_run_task(&task_setup_data);
6308         if (IS_ERR(task))
6309                 return ERR_CAST(task);
6310         status = nfs4_wait_for_completion_rpc_task(task);
6311         if (status == 0)
6312                 status = task->tk_status;
6313         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6314         if (status == 0 && lgp->res.layoutp->len)
6315                 lseg = pnfs_layout_process(lgp);
6316         rpc_put_task(task);
6317         dprintk("<-- %s status=%d\n", __func__, status);
6318         if (status)
6319                 return ERR_PTR(status);
6320         return lseg;
6321 }
6322
6323 static void
6324 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6325 {
6326         struct nfs4_layoutreturn *lrp = calldata;
6327
6328         dprintk("--> %s\n", __func__);
6329         nfs41_setup_sequence(lrp->clp->cl_session,
6330                         &lrp->args.seq_args,
6331                         &lrp->res.seq_res,
6332                         task);
6333 }
6334
6335 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6336 {
6337         struct nfs4_layoutreturn *lrp = calldata;
6338         struct nfs_server *server;
6339
6340         dprintk("--> %s\n", __func__);
6341
6342         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6343                 return;
6344
6345         server = NFS_SERVER(lrp->args.inode);
6346         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6347                 rpc_restart_call_prepare(task);
6348                 return;
6349         }
6350         dprintk("<-- %s\n", __func__);
6351 }
6352
6353 static void nfs4_layoutreturn_release(void *calldata)
6354 {
6355         struct nfs4_layoutreturn *lrp = calldata;
6356         struct pnfs_layout_hdr *lo = lrp->args.layout;
6357
6358         dprintk("--> %s\n", __func__);
6359         spin_lock(&lo->plh_inode->i_lock);
6360         if (lrp->res.lrs_present)
6361                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6362         lo->plh_block_lgets--;
6363         spin_unlock(&lo->plh_inode->i_lock);
6364         pnfs_put_layout_hdr(lrp->args.layout);
6365         kfree(calldata);
6366         dprintk("<-- %s\n", __func__);
6367 }
6368
6369 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6370         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6371         .rpc_call_done = nfs4_layoutreturn_done,
6372         .rpc_release = nfs4_layoutreturn_release,
6373 };
6374
6375 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6376 {
6377         struct rpc_task *task;
6378         struct rpc_message msg = {
6379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6380                 .rpc_argp = &lrp->args,
6381                 .rpc_resp = &lrp->res,
6382         };
6383         struct rpc_task_setup task_setup_data = {
6384                 .rpc_client = lrp->clp->cl_rpcclient,
6385                 .rpc_message = &msg,
6386                 .callback_ops = &nfs4_layoutreturn_call_ops,
6387                 .callback_data = lrp,
6388         };
6389         int status;
6390
6391         dprintk("--> %s\n", __func__);
6392         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6393         task = rpc_run_task(&task_setup_data);
6394         if (IS_ERR(task))
6395                 return PTR_ERR(task);
6396         status = task->tk_status;
6397         dprintk("<-- %s status=%d\n", __func__, status);
6398         rpc_put_task(task);
6399         return status;
6400 }
6401
6402 /*
6403  * Retrieve the list of Data Server devices from the MDS.
6404  */
6405 static int _nfs4_getdevicelist(struct nfs_server *server,
6406                                     const struct nfs_fh *fh,
6407                                     struct pnfs_devicelist *devlist)
6408 {
6409         struct nfs4_getdevicelist_args args = {
6410                 .fh = fh,
6411                 .layoutclass = server->pnfs_curr_ld->id,
6412         };
6413         struct nfs4_getdevicelist_res res = {
6414                 .devlist = devlist,
6415         };
6416         struct rpc_message msg = {
6417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6418                 .rpc_argp = &args,
6419                 .rpc_resp = &res,
6420         };
6421         int status;
6422
6423         dprintk("--> %s\n", __func__);
6424         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6425                                 &res.seq_res, 0);
6426         dprintk("<-- %s status=%d\n", __func__, status);
6427         return status;
6428 }
6429
6430 int nfs4_proc_getdevicelist(struct nfs_server *server,
6431                             const struct nfs_fh *fh,
6432                             struct pnfs_devicelist *devlist)
6433 {
6434         struct nfs4_exception exception = { };
6435         int err;
6436
6437         do {
6438                 err = nfs4_handle_exception(server,
6439                                 _nfs4_getdevicelist(server, fh, devlist),
6440                                 &exception);
6441         } while (exception.retry);
6442
6443         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6444                 err, devlist->num_devs);
6445
6446         return err;
6447 }
6448 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6449
6450 static int
6451 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6452 {
6453         struct nfs4_getdeviceinfo_args args = {
6454                 .pdev = pdev,
6455         };
6456         struct nfs4_getdeviceinfo_res res = {
6457                 .pdev = pdev,
6458         };
6459         struct rpc_message msg = {
6460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6461                 .rpc_argp = &args,
6462                 .rpc_resp = &res,
6463         };
6464         int status;
6465
6466         dprintk("--> %s\n", __func__);
6467         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6468         dprintk("<-- %s status=%d\n", __func__, status);
6469
6470         return status;
6471 }
6472
6473 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6474 {
6475         struct nfs4_exception exception = { };
6476         int err;
6477
6478         do {
6479                 err = nfs4_handle_exception(server,
6480                                         _nfs4_proc_getdeviceinfo(server, pdev),
6481                                         &exception);
6482         } while (exception.retry);
6483         return err;
6484 }
6485 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6486
6487 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6488 {
6489         struct nfs4_layoutcommit_data *data = calldata;
6490         struct nfs_server *server = NFS_SERVER(data->args.inode);
6491         struct nfs4_session *session = nfs4_get_session(server);
6492
6493         nfs41_setup_sequence(session,
6494                         &data->args.seq_args,
6495                         &data->res.seq_res,
6496                         task);
6497 }
6498
6499 static void
6500 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6501 {
6502         struct nfs4_layoutcommit_data *data = calldata;
6503         struct nfs_server *server = NFS_SERVER(data->args.inode);
6504
6505         if (!nfs41_sequence_done(task, &data->res.seq_res))
6506                 return;
6507
6508         switch (task->tk_status) { /* Just ignore these failures */
6509         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6510         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6511         case -NFS4ERR_BADLAYOUT:     /* no layout */
6512         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6513                 task->tk_status = 0;
6514                 break;
6515         case 0:
6516                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6517                                                    data->res.fattr);
6518                 break;
6519         default:
6520                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6521                         rpc_restart_call_prepare(task);
6522                         return;
6523                 }
6524         }
6525 }
6526
6527 static void nfs4_layoutcommit_release(void *calldata)
6528 {
6529         struct nfs4_layoutcommit_data *data = calldata;
6530
6531         pnfs_cleanup_layoutcommit(data);
6532         put_rpccred(data->cred);
6533         kfree(data);
6534 }
6535
6536 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6537         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6538         .rpc_call_done = nfs4_layoutcommit_done,
6539         .rpc_release = nfs4_layoutcommit_release,
6540 };
6541
6542 int
6543 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6544 {
6545         struct rpc_message msg = {
6546                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6547                 .rpc_argp = &data->args,
6548                 .rpc_resp = &data->res,
6549                 .rpc_cred = data->cred,
6550         };
6551         struct rpc_task_setup task_setup_data = {
6552                 .task = &data->task,
6553                 .rpc_client = NFS_CLIENT(data->args.inode),
6554                 .rpc_message = &msg,
6555                 .callback_ops = &nfs4_layoutcommit_ops,
6556                 .callback_data = data,
6557                 .flags = RPC_TASK_ASYNC,
6558         };
6559         struct rpc_task *task;
6560         int status = 0;
6561
6562         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6563                 "lbw: %llu inode %lu\n",
6564                 data->task.tk_pid, sync,
6565                 data->args.lastbytewritten,
6566                 data->args.inode->i_ino);
6567
6568         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6569         task = rpc_run_task(&task_setup_data);
6570         if (IS_ERR(task))
6571                 return PTR_ERR(task);
6572         if (sync == false)
6573                 goto out;
6574         status = nfs4_wait_for_completion_rpc_task(task);
6575         if (status != 0)
6576                 goto out;
6577         status = task->tk_status;
6578 out:
6579         dprintk("%s: status %d\n", __func__, status);
6580         rpc_put_task(task);
6581         return status;
6582 }
6583
6584 static int
6585 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6586                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6587 {
6588         struct nfs41_secinfo_no_name_args args = {
6589                 .style = SECINFO_STYLE_CURRENT_FH,
6590         };
6591         struct nfs4_secinfo_res res = {
6592                 .flavors = flavors,
6593         };
6594         struct rpc_message msg = {
6595                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6596                 .rpc_argp = &args,
6597                 .rpc_resp = &res,
6598         };
6599         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6600 }
6601
6602 static int
6603 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6604                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6605 {
6606         struct nfs4_exception exception = { };
6607         int err;
6608         do {
6609                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6610                 switch (err) {
6611                 case 0:
6612                 case -NFS4ERR_WRONGSEC:
6613                 case -NFS4ERR_NOTSUPP:
6614                         goto out;
6615                 default:
6616                         err = nfs4_handle_exception(server, err, &exception);
6617                 }
6618         } while (exception.retry);
6619 out:
6620         return err;
6621 }
6622
6623 static int
6624 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6625                     struct nfs_fsinfo *info)
6626 {
6627         int err;
6628         struct page *page;
6629         rpc_authflavor_t flavor;
6630         struct nfs4_secinfo_flavors *flavors;
6631
6632         page = alloc_page(GFP_KERNEL);
6633         if (!page) {
6634                 err = -ENOMEM;
6635                 goto out;
6636         }
6637
6638         flavors = page_address(page);
6639         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6640
6641         /*
6642          * Fall back on "guess and check" method if
6643          * the server doesn't support SECINFO_NO_NAME
6644          */
6645         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6646                 err = nfs4_find_root_sec(server, fhandle, info);
6647                 goto out_freepage;
6648         }
6649         if (err)
6650                 goto out_freepage;
6651
6652         flavor = nfs_find_best_sec(flavors);
6653         if (err == 0)
6654                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6655
6656 out_freepage:
6657         put_page(page);
6658         if (err == -EACCES)
6659                 return -EPERM;
6660 out:
6661         return err;
6662 }
6663
6664 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6665 {
6666         int status;
6667         struct nfs41_test_stateid_args args = {
6668                 .stateid = stateid,
6669         };
6670         struct nfs41_test_stateid_res res;
6671         struct rpc_message msg = {
6672                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6673                 .rpc_argp = &args,
6674                 .rpc_resp = &res,
6675         };
6676
6677         dprintk("NFS call  test_stateid %p\n", stateid);
6678         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6679         nfs4_set_sequence_privileged(&args.seq_args);
6680         status = nfs4_call_sync_sequence(server->client, server, &msg,
6681                         &args.seq_args, &res.seq_res);
6682         if (status != NFS_OK) {
6683                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6684                 return status;
6685         }
6686         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6687         return -res.status;
6688 }
6689
6690 /**
6691  * nfs41_test_stateid - perform a TEST_STATEID operation
6692  *
6693  * @server: server / transport on which to perform the operation
6694  * @stateid: state ID to test
6695  *
6696  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6697  * Otherwise a negative NFS4ERR value is returned if the operation
6698  * failed or the state ID is not currently valid.
6699  */
6700 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6701 {
6702         struct nfs4_exception exception = { };
6703         int err;
6704         do {
6705                 err = _nfs41_test_stateid(server, stateid);
6706                 if (err != -NFS4ERR_DELAY)
6707                         break;
6708                 nfs4_handle_exception(server, err, &exception);
6709         } while (exception.retry);
6710         return err;
6711 }
6712
6713 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6714 {
6715         struct nfs41_free_stateid_args args = {
6716                 .stateid = stateid,
6717         };
6718         struct nfs41_free_stateid_res res;
6719         struct rpc_message msg = {
6720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6721                 .rpc_argp = &args,
6722                 .rpc_resp = &res,
6723         };
6724         int status;
6725
6726         dprintk("NFS call  free_stateid %p\n", stateid);
6727         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6728         nfs4_set_sequence_privileged(&args.seq_args);
6729         status = nfs4_call_sync_sequence(server->client, server, &msg,
6730                         &args.seq_args, &res.seq_res);
6731         dprintk("NFS reply free_stateid: %d\n", status);
6732         return status;
6733 }
6734
6735 /**
6736  * nfs41_free_stateid - perform a FREE_STATEID operation
6737  *
6738  * @server: server / transport on which to perform the operation
6739  * @stateid: state ID to release
6740  *
6741  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6742  * negative NFS4ERR value is returned.
6743  */
6744 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6745 {
6746         struct nfs4_exception exception = { };
6747         int err;
6748         do {
6749                 err = _nfs4_free_stateid(server, stateid);
6750                 if (err != -NFS4ERR_DELAY)
6751                         break;
6752                 nfs4_handle_exception(server, err, &exception);
6753         } while (exception.retry);
6754         return err;
6755 }
6756
6757 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6758                 const nfs4_stateid *s2)
6759 {
6760         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6761                 return false;
6762
6763         if (s1->seqid == s2->seqid)
6764                 return true;
6765         if (s1->seqid == 0 || s2->seqid == 0)
6766                 return true;
6767
6768         return false;
6769 }
6770
6771 #endif /* CONFIG_NFS_V4_1 */
6772
6773 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6774                 const nfs4_stateid *s2)
6775 {
6776         return nfs4_stateid_match(s1, s2);
6777 }
6778
6779
6780 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6781         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6782         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6783         .recover_open   = nfs4_open_reclaim,
6784         .recover_lock   = nfs4_lock_reclaim,
6785         .establish_clid = nfs4_init_clientid,
6786         .get_clid_cred  = nfs4_get_setclientid_cred,
6787         .detect_trunking = nfs40_discover_server_trunking,
6788 };
6789
6790 #if defined(CONFIG_NFS_V4_1)
6791 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6792         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6793         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6794         .recover_open   = nfs4_open_reclaim,
6795         .recover_lock   = nfs4_lock_reclaim,
6796         .establish_clid = nfs41_init_clientid,
6797         .get_clid_cred  = nfs4_get_exchange_id_cred,
6798         .reclaim_complete = nfs41_proc_reclaim_complete,
6799         .detect_trunking = nfs41_discover_server_trunking,
6800 };
6801 #endif /* CONFIG_NFS_V4_1 */
6802
6803 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6804         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6805         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6806         .recover_open   = nfs4_open_expired,
6807         .recover_lock   = nfs4_lock_expired,
6808         .establish_clid = nfs4_init_clientid,
6809         .get_clid_cred  = nfs4_get_setclientid_cred,
6810 };
6811
6812 #if defined(CONFIG_NFS_V4_1)
6813 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6814         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6815         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6816         .recover_open   = nfs41_open_expired,
6817         .recover_lock   = nfs41_lock_expired,
6818         .establish_clid = nfs41_init_clientid,
6819         .get_clid_cred  = nfs4_get_exchange_id_cred,
6820 };
6821 #endif /* CONFIG_NFS_V4_1 */
6822
6823 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6824         .sched_state_renewal = nfs4_proc_async_renew,
6825         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6826         .renew_lease = nfs4_proc_renew,
6827 };
6828
6829 #if defined(CONFIG_NFS_V4_1)
6830 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6831         .sched_state_renewal = nfs41_proc_async_sequence,
6832         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6833         .renew_lease = nfs4_proc_sequence,
6834 };
6835 #endif
6836
6837 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6838         .minor_version = 0,
6839         .init_caps = NFS_CAP_READDIRPLUS
6840                 | NFS_CAP_ATOMIC_OPEN
6841                 | NFS_CAP_CHANGE_ATTR
6842                 | NFS_CAP_POSIX_LOCK,
6843         .call_sync = _nfs4_call_sync,
6844         .match_stateid = nfs4_match_stateid,
6845         .find_root_sec = nfs4_find_root_sec,
6846         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6847         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6848         .state_renewal_ops = &nfs40_state_renewal_ops,
6849 };
6850
6851 #if defined(CONFIG_NFS_V4_1)
6852 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6853         .minor_version = 1,
6854         .init_caps = NFS_CAP_READDIRPLUS
6855                 | NFS_CAP_ATOMIC_OPEN
6856                 | NFS_CAP_CHANGE_ATTR
6857                 | NFS_CAP_POSIX_LOCK
6858                 | NFS_CAP_STATEID_NFSV41
6859                 | NFS_CAP_ATOMIC_OPEN_V1,
6860         .call_sync = nfs4_call_sync_sequence,
6861         .match_stateid = nfs41_match_stateid,
6862         .find_root_sec = nfs41_find_root_sec,
6863         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6864         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6865         .state_renewal_ops = &nfs41_state_renewal_ops,
6866 };
6867 #endif
6868
6869 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6870         [0] = &nfs_v4_0_minor_ops,
6871 #if defined(CONFIG_NFS_V4_1)
6872         [1] = &nfs_v4_1_minor_ops,
6873 #endif
6874 };
6875
6876 const struct inode_operations nfs4_dir_inode_operations = {
6877         .create         = nfs_create,
6878         .lookup         = nfs_lookup,
6879         .atomic_open    = nfs_atomic_open,
6880         .link           = nfs_link,
6881         .unlink         = nfs_unlink,
6882         .symlink        = nfs_symlink,
6883         .mkdir          = nfs_mkdir,
6884         .rmdir          = nfs_rmdir,
6885         .mknod          = nfs_mknod,
6886         .rename         = nfs_rename,
6887         .permission     = nfs_permission,
6888         .getattr        = nfs_getattr,
6889         .setattr        = nfs_setattr,
6890         .getxattr       = generic_getxattr,
6891         .setxattr       = generic_setxattr,
6892         .listxattr      = generic_listxattr,
6893         .removexattr    = generic_removexattr,
6894 };
6895
6896 static const struct inode_operations nfs4_file_inode_operations = {
6897         .permission     = nfs_permission,
6898         .getattr        = nfs_getattr,
6899         .setattr        = nfs_setattr,
6900         .getxattr       = generic_getxattr,
6901         .setxattr       = generic_setxattr,
6902         .listxattr      = generic_listxattr,
6903         .removexattr    = generic_removexattr,
6904 };
6905
6906 const struct nfs_rpc_ops nfs_v4_clientops = {
6907         .version        = 4,                    /* protocol version */
6908         .dentry_ops     = &nfs4_dentry_operations,
6909         .dir_inode_ops  = &nfs4_dir_inode_operations,
6910         .file_inode_ops = &nfs4_file_inode_operations,
6911         .file_ops       = &nfs4_file_operations,
6912         .getroot        = nfs4_proc_get_root,
6913         .submount       = nfs4_submount,
6914         .try_mount      = nfs4_try_mount,
6915         .getattr        = nfs4_proc_getattr,
6916         .setattr        = nfs4_proc_setattr,
6917         .lookup         = nfs4_proc_lookup,
6918         .access         = nfs4_proc_access,
6919         .readlink       = nfs4_proc_readlink,
6920         .create         = nfs4_proc_create,
6921         .remove         = nfs4_proc_remove,
6922         .unlink_setup   = nfs4_proc_unlink_setup,
6923         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6924         .unlink_done    = nfs4_proc_unlink_done,
6925         .rename         = nfs4_proc_rename,
6926         .rename_setup   = nfs4_proc_rename_setup,
6927         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6928         .rename_done    = nfs4_proc_rename_done,
6929         .link           = nfs4_proc_link,
6930         .symlink        = nfs4_proc_symlink,
6931         .mkdir          = nfs4_proc_mkdir,
6932         .rmdir          = nfs4_proc_remove,
6933         .readdir        = nfs4_proc_readdir,
6934         .mknod          = nfs4_proc_mknod,
6935         .statfs         = nfs4_proc_statfs,
6936         .fsinfo         = nfs4_proc_fsinfo,
6937         .pathconf       = nfs4_proc_pathconf,
6938         .set_capabilities = nfs4_server_capabilities,
6939         .decode_dirent  = nfs4_decode_dirent,
6940         .read_setup     = nfs4_proc_read_setup,
6941         .read_pageio_init = pnfs_pageio_init_read,
6942         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6943         .read_done      = nfs4_read_done,
6944         .write_setup    = nfs4_proc_write_setup,
6945         .write_pageio_init = pnfs_pageio_init_write,
6946         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6947         .write_done     = nfs4_write_done,
6948         .commit_setup   = nfs4_proc_commit_setup,
6949         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6950         .commit_done    = nfs4_commit_done,
6951         .lock           = nfs4_proc_lock,
6952         .clear_acl_cache = nfs4_zap_acl_attr,
6953         .close_context  = nfs4_close_context,
6954         .open_context   = nfs4_atomic_open,
6955         .have_delegation = nfs4_have_delegation,
6956         .return_delegation = nfs4_inode_return_delegation,
6957         .alloc_client   = nfs4_alloc_client,
6958         .init_client    = nfs4_init_client,
6959         .free_client    = nfs4_free_client,
6960         .create_server  = nfs4_create_server,
6961         .clone_server   = nfs_clone_server,
6962 };
6963
6964 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6965         .prefix = XATTR_NAME_NFSV4_ACL,
6966         .list   = nfs4_xattr_list_nfs4_acl,
6967         .get    = nfs4_xattr_get_nfs4_acl,
6968         .set    = nfs4_xattr_set_nfs4_acl,
6969 };
6970
6971 const struct xattr_handler *nfs4_xattr_handlers[] = {
6972         &nfs4_xattr_nfs4_acl_handler,
6973         NULL
6974 };
6975
6976 /*
6977  * Local variables:
6978  *  c-basic-offset: 8
6979  * End:
6980  */