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         default:
 111                 dprintk("%s could not handle NFSv4 error %d\n",
 112                                 __func__, -err);
 113                 break;
 114         }
 115         return -EIO;
 116 }
 117
 118 /*
 119  * This is our standard bitmap for GETATTR requests.
 120  */
 121 const u32 nfs4_fattr_bitmap[3] = {
 122         FATTR4_WORD0_TYPE
 123         | FATTR4_WORD0_CHANGE
 124         | FATTR4_WORD0_SIZE
 125         | FATTR4_WORD0_FSID
 126         | FATTR4_WORD0_FILEID,
 127         FATTR4_WORD1_MODE
 128         | FATTR4_WORD1_NUMLINKS
 129         | FATTR4_WORD1_OWNER
 130         | FATTR4_WORD1_OWNER_GROUP
 131         | FATTR4_WORD1_RAWDEV
 132         | FATTR4_WORD1_SPACE_USED
 133         | FATTR4_WORD1_TIME_ACCESS
 134         | FATTR4_WORD1_TIME_METADATA
 135         | FATTR4_WORD1_TIME_MODIFY
 136 };
 137
 138 static const u32 nfs4_pnfs_open_bitmap[3] = {
 139         FATTR4_WORD0_TYPE
 140         | FATTR4_WORD0_CHANGE
 141         | FATTR4_WORD0_SIZE
 142         | FATTR4_WORD0_FSID
 143         | FATTR4_WORD0_FILEID,
 144         FATTR4_WORD1_MODE
 145         | FATTR4_WORD1_NUMLINKS
 146         | FATTR4_WORD1_OWNER
 147         | FATTR4_WORD1_OWNER_GROUP
 148         | FATTR4_WORD1_RAWDEV
 149         | FATTR4_WORD1_SPACE_USED
 150         | FATTR4_WORD1_TIME_ACCESS
 151         | FATTR4_WORD1_TIME_METADATA
 152         | FATTR4_WORD1_TIME_MODIFY,
 153         FATTR4_WORD2_MDSTHRESHOLD
 154 };
 155
 156 static const u32 nfs4_open_noattr_bitmap[3] = {
 157         FATTR4_WORD0_TYPE
 158         | FATTR4_WORD0_CHANGE
 159         | FATTR4_WORD0_FILEID,
 160 };
 161
 162 const u32 nfs4_statfs_bitmap[2] = {
 163         FATTR4_WORD0_FILES_AVAIL
 164         | FATTR4_WORD0_FILES_FREE
 165         | FATTR4_WORD0_FILES_TOTAL,
 166         FATTR4_WORD1_SPACE_AVAIL
 167         | FATTR4_WORD1_SPACE_FREE
 168         | FATTR4_WORD1_SPACE_TOTAL
 169 };
 170
 171 const u32 nfs4_pathconf_bitmap[2] = {
 172         FATTR4_WORD0_MAXLINK
 173         | FATTR4_WORD0_MAXNAME,
 174         0
 175 };
 176
 177 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 178                         | FATTR4_WORD0_MAXREAD
 179                         | FATTR4_WORD0_MAXWRITE
 180                         | FATTR4_WORD0_LEASE_TIME,
 181                         FATTR4_WORD1_TIME_DELTA
 182                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 183                         FATTR4_WORD2_LAYOUT_BLKSIZE
 184 };
 185
 186 const u32 nfs4_fs_locations_bitmap[2] = {
 187         FATTR4_WORD0_TYPE
 188         | FATTR4_WORD0_CHANGE
 189         | FATTR4_WORD0_SIZE
 190         | FATTR4_WORD0_FSID
 191         | FATTR4_WORD0_FILEID
 192         | FATTR4_WORD0_FS_LOCATIONS,
 193         FATTR4_WORD1_MODE
 194         | FATTR4_WORD1_NUMLINKS
 195         | FATTR4_WORD1_OWNER
 196         | FATTR4_WORD1_OWNER_GROUP
 197         | FATTR4_WORD1_RAWDEV
 198         | FATTR4_WORD1_SPACE_USED
 199         | FATTR4_WORD1_TIME_ACCESS
 200         | FATTR4_WORD1_TIME_METADATA
 201         | FATTR4_WORD1_TIME_MODIFY
 202         | FATTR4_WORD1_MOUNTED_ON_FILEID
 203 };
 204
 205 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 206                 struct nfs4_readdir_arg *readdir)
 207 {
 208         __be32 *start, *p;
 209
 210         if (cookie > 2) {
 211                 readdir->cookie = cookie;
 212                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 213                 return;
 214         }
 215
 216         readdir->cookie = 0;
 217         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 218         if (cookie == 2)
 219                 return;
 220
 221         /*
 222          * NFSv4 servers do not return entries for '.' and '..'
 223          * Therefore, we fake these entries here.  We let '.'
 224          * have cookie 0 and '..' have cookie 1.  Note that
 225          * when talking to the server, we always send cookie 0
 226          * instead of 1 or 2.
 227          */
 228         start = p = kmap_atomic(*readdir->pages);
 229
 230         if (cookie == 0) {
 231                 *p++ = xdr_one;                                  /* next */
 232                 *p++ = xdr_zero;                   /* cookie, first word */
 233                 *p++ = xdr_one;                   /* cookie, second word */
 234                 *p++ = xdr_one;                             /* entry len */
 235                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 236                 p++;
 237                 *p++ = xdr_one;                         /* bitmap length */
 238                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 239                 *p++ = htonl(8);              /* attribute buffer length */
 240                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 241         }
 242
 243         *p++ = xdr_one;                                  /* next */
 244         *p++ = xdr_zero;                   /* cookie, first word */
 245         *p++ = xdr_two;                   /* cookie, second word */
 246         *p++ = xdr_two;                             /* entry len */
 247         memcpy(p, "..\0\0", 4);                         /* entry */
 248         p++;
 249         *p++ = xdr_one;                         /* bitmap length */
 250         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 251         *p++ = htonl(8);              /* attribute buffer length */
 252         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 253
 254         readdir->pgbase = (char *)p - (char *)start;
 255         readdir->count -= readdir->pgbase;
 256         kunmap_atomic(start);
 257 }
 258
 259 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 260 {
 261         int res = 0;
 262
 263         might_sleep();
 264
 265         if (*timeout <= 0)
 266                 *timeout = NFS4_POLL_RETRY_MIN;
 267         if (*timeout > NFS4_POLL_RETRY_MAX)
 268                 *timeout = NFS4_POLL_RETRY_MAX;
 269         freezable_schedule_timeout_killable(*timeout);
 270         if (fatal_signal_pending(current))
 271                 res = -ERESTARTSYS;
 272         *timeout <<= 1;
 273         return res;
 274 }
 275
 276 /* This is the error handling routine for processes that are allowed
 277  * to sleep.
 278  */
 279 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 280 {
 281         struct nfs_client *clp = server->nfs_client;
 282         struct nfs4_state *state = exception->state;
 283         struct inode *inode = exception->inode;
 284         int ret = errorcode;
 285
 286         exception->retry = 0;
 287         switch(errorcode) {
 288                 case 0:
 289                         return 0;
 290                 case -NFS4ERR_OPENMODE:
 291                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 292                                 nfs4_inode_return_delegation(inode);
 293                                 exception->retry = 1;
 294                                 return 0;
 295                         }
 296                         if (state == NULL)
 297                                 break;
 298                         ret = nfs4_schedule_stateid_recovery(server, state);
 299                         if (ret < 0)
 300                                 break;
 301                         goto wait_on_recovery;
 302                 case -NFS4ERR_DELEG_REVOKED:
 303                 case -NFS4ERR_ADMIN_REVOKED:
 304                 case -NFS4ERR_BAD_STATEID:
 305                         if (state == NULL)
 306                                 break;
 307                         nfs_remove_bad_delegation(state->inode);
 308                         ret = nfs4_schedule_stateid_recovery(server, state);
 309                         if (ret < 0)
 310                                 break;
 311                         goto wait_on_recovery;
 312                 case -NFS4ERR_EXPIRED:
 313                         if (state != NULL) {
 314                                 ret = nfs4_schedule_stateid_recovery(server, state);
 315                                 if (ret < 0)
 316                                         break;
 317                         }
 318                 case -NFS4ERR_STALE_STATEID:
 319                 case -NFS4ERR_STALE_CLIENTID:
 320                         nfs4_schedule_lease_recovery(clp);
 321                         goto wait_on_recovery;
 322 #if defined(CONFIG_NFS_V4_1)
 323                 case -NFS4ERR_BADSESSION:
 324                 case -NFS4ERR_BADSLOT:
 325                 case -NFS4ERR_BAD_HIGH_SLOT:
 326                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 327                 case -NFS4ERR_DEADSESSION:
 328                 case -NFS4ERR_SEQ_FALSE_RETRY:
 329                 case -NFS4ERR_SEQ_MISORDERED:
 330                         dprintk("%s ERROR: %d Reset session\n", __func__,
 331                                 errorcode);
 332                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 333                         goto wait_on_recovery;
 334 #endif /* defined(CONFIG_NFS_V4_1) */
 335                 case -NFS4ERR_FILE_OPEN:
 336                         if (exception->timeout > HZ) {
 337                                 /* We have retried a decent amount, time to
 338                                  * fail
 339                                  */
 340                                 ret = -EBUSY;
 341                                 break;
 342                         }
 343                 case -NFS4ERR_GRACE:
 344                 case -NFS4ERR_DELAY:
 345                         ret = nfs4_delay(server->client, &exception->timeout);
 346                         if (ret != 0)
 347                                 break;
 348                 case -NFS4ERR_RETRY_UNCACHED_REP:
 349                 case -NFS4ERR_OLD_STATEID:
 350                         exception->retry = 1;
 351                         break;
 352                 case -NFS4ERR_BADOWNER:
 353                         /* The following works around a Linux server bug! */
 354                 case -NFS4ERR_BADNAME:
 355                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 356                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 357                                 exception->retry = 1;
 358                                 printk(KERN_WARNING "NFS: v4 server %s "
 359                                                 "does not accept raw "
 360                                                 "uid/gids. "
 361                                                 "Reenabling the idmapper.\n",
 362                                                 server->nfs_client->cl_hostname);
 363                         }
 364         }
 365         /* We failed to handle the error */
 366         return nfs4_map_errors(ret);
 367 wait_on_recovery:
 368         ret = nfs4_wait_clnt_recover(clp);
 369         if (ret == 0)
 370                 exception->retry = 1;
 371         return ret;
 372 }
 373
 374
 375 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 376 {
 377         spin_lock(&clp->cl_lock);
 378         if (time_before(clp->cl_last_renewal,timestamp))
 379                 clp->cl_last_renewal = timestamp;
 380         spin_unlock(&clp->cl_lock);
 381 }
 382
 383 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 384 {
 385         do_renew_lease(server->nfs_client, timestamp);
 386 }
 387
 388 #if defined(CONFIG_NFS_V4_1)
 389
 390 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 391 {
 392         struct nfs4_session *session;
 393         struct nfs4_slot_table *tbl;
 394         bool send_new_highest_used_slotid = false;
 395
 396         if (!res->sr_slot) {
 397                 /* just wake up the next guy waiting since
 398                  * we may have not consumed a slot after all */
 399                 dprintk("%s: No slot\n", __func__);
 400                 return;
 401         }
 402         tbl = res->sr_slot->table;
 403         session = tbl->session;
 404
 405         spin_lock(&tbl->slot_tbl_lock);
 406         /* Be nice to the server: try to ensure that the last transmitted
 407          * value for highest_user_slotid <= target_highest_slotid
 408          */
 409         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 410                 send_new_highest_used_slotid = true;
 411
 412         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 413                 send_new_highest_used_slotid = false;
 414                 goto out_unlock;
 415         }
 416         nfs4_free_slot(tbl, res->sr_slot);
 417
 418         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 419                 send_new_highest_used_slotid = false;
 420 out_unlock:
 421         spin_unlock(&tbl->slot_tbl_lock);
 422         res->sr_slot = NULL;
 423         if (send_new_highest_used_slotid)
 424                 nfs41_server_notify_highest_slotid_update(session->clp);
 425 }
 426
 427 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 428 {
 429         struct nfs4_session *session;
 430         struct nfs4_slot *slot;
 431         struct nfs_client *clp;
 432         bool interrupted = false;
 433         int ret = 1;
 434
 435         /* don't increment the sequence number if the task wasn't sent */
 436         if (!RPC_WAS_SENT(task))
 437                 goto out;
 438
 439         slot = res->sr_slot;
 440         session = slot->table->session;
 441
 442         if (slot->interrupted) {
 443                 slot->interrupted = 0;
 444                 interrupted = true;
 445         }
 446
 447         /* Check the SEQUENCE operation status */
 448         switch (res->sr_status) {
 449         case 0:
 450                 /* Update the slot's sequence and clientid lease timer */
 451                 ++slot->seq_nr;
 452                 clp = session->clp;
 453                 do_renew_lease(clp, res->sr_timestamp);
 454                 /* Check sequence flags */
 455                 if (res->sr_status_flags != 0)
 456                         nfs4_schedule_lease_recovery(clp);
 457                 nfs41_update_target_slotid(slot->table, slot, res);
 458                 break;
 459         case 1:
 460                 /*
 461                  * sr_status remains 1 if an RPC level error occurred.
 462                  * The server may or may not have processed the sequence
 463                  * operation..
 464                  * Mark the slot as having hosted an interrupted RPC call.
 465                  */
 466                 slot->interrupted = 1;
 467                 goto out;
 468         case -NFS4ERR_DELAY:
 469                 /* The server detected a resend of the RPC call and
 470                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 471                  * of RFC5661.
 472                  */
 473                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 474                         __func__,
 475                         slot->slot_nr,
 476                         slot->seq_nr);
 477                 goto out_retry;
 478         case -NFS4ERR_BADSLOT:
 479                 /*
 480                  * The slot id we used was probably retired. Try again
 481                  * using a different slot id.
 482                  */
 483                 goto retry_nowait;
 484         case -NFS4ERR_SEQ_MISORDERED:
 485                 /*
 486                  * Was the last operation on this sequence interrupted?
 487                  * If so, retry after bumping the sequence number.
 488                  */
 489                 if (interrupted) {
 490                         ++slot->seq_nr;
 491                         goto retry_nowait;
 492                 }
 493                 /*
 494                  * Could this slot have been previously retired?
 495                  * If so, then the server may be expecting seq_nr = 1!
 496                  */
 497                 if (slot->seq_nr != 1) {
 498                         slot->seq_nr = 1;
 499                         goto retry_nowait;
 500                 }
 501                 break;
 502         case -NFS4ERR_SEQ_FALSE_RETRY:
 503                 ++slot->seq_nr;
 504                 goto retry_nowait;
 505         default:
 506                 /* Just update the slot sequence no. */
 507                 ++slot->seq_nr;
 508         }
 509 out:
 510         /* The session may be reset by one of the error handlers. */
 511         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 512         nfs41_sequence_free_slot(res);
 513         return ret;
 514 retry_nowait:
 515         if (rpc_restart_call_prepare(task)) {
 516                 task->tk_status = 0;
 517                 ret = 0;
 518         }
 519         goto out;
 520 out_retry:
 521         if (!rpc_restart_call(task))
 522                 goto out;
 523         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 524         return 0;
 525 }
 526
 527 static int nfs4_sequence_done(struct rpc_task *task,
 528                                struct nfs4_sequence_res *res)
 529 {
 530         if (res->sr_slot == NULL)
 531                 return 1;
 532         return nfs41_sequence_done(task, res);
 533 }
 534
 535 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 536                 struct nfs4_sequence_res *res, int cache_reply)
 537 {
 538         args->sa_slot = NULL;
 539         args->sa_cache_this = 0;
 540         args->sa_privileged = 0;
 541         if (cache_reply)
 542                 args->sa_cache_this = 1;
 543         res->sr_slot = NULL;
 544 }
 545
 546 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 547 {
 548         args->sa_privileged = 1;
 549 }
 550
 551 int nfs41_setup_sequence(struct nfs4_session *session,
 552                                 struct nfs4_sequence_args *args,
 553                                 struct nfs4_sequence_res *res,
 554                                 struct rpc_task *task)
 555 {
 556         struct nfs4_slot *slot;
 557         struct nfs4_slot_table *tbl;
 558
 559         dprintk("--> %s\n", __func__);
 560         /* slot already allocated? */
 561         if (res->sr_slot != NULL)
 562                 goto out_success;
 563
 564         tbl = &session->fc_slot_table;
 565
 566         task->tk_timeout = 0;
 567
 568         spin_lock(&tbl->slot_tbl_lock);
 569         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 570             !args->sa_privileged) {
 571                 /* The state manager will wait until the slot table is empty */
 572                 dprintk("%s session is draining\n", __func__);
 573                 goto out_sleep;
 574         }
 575
 576         slot = nfs4_alloc_slot(tbl);
 577         if (IS_ERR(slot)) {
 578                 /* If out of memory, try again in 1/4 second */
 579                 if (slot == ERR_PTR(-ENOMEM))
 580                         task->tk_timeout = HZ >> 2;
 581                 dprintk("<-- %s: no free slots\n", __func__);
 582                 goto out_sleep;
 583         }
 584         spin_unlock(&tbl->slot_tbl_lock);
 585
 586         args->sa_slot = slot;
 587
 588         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 589                         slot->slot_nr, slot->seq_nr);
 590
 591         res->sr_slot = slot;
 592         res->sr_timestamp = jiffies;
 593         res->sr_status_flags = 0;
 594         /*
 595          * sr_status is only set in decode_sequence, and so will remain
 596          * set to 1 if an rpc level failure occurs.
 597          */
 598         res->sr_status = 1;
 599 out_success:
 600         rpc_call_start(task);
 601         return 0;
 602 out_sleep:
 603         /* Privileged tasks are queued with top priority */
 604         if (args->sa_privileged)
 605                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 606                                 NULL, RPC_PRIORITY_PRIVILEGED);
 607         else
 608                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 609         spin_unlock(&tbl->slot_tbl_lock);
 610         return -EAGAIN;
 611 }
 612 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 613
 614 int nfs4_setup_sequence(const struct nfs_server *server,
 615                         struct nfs4_sequence_args *args,
 616                         struct nfs4_sequence_res *res,
 617                         struct rpc_task *task)
 618 {
 619         struct nfs4_session *session = nfs4_get_session(server);
 620         int ret = 0;
 621
 622         if (session == NULL) {
 623                 rpc_call_start(task);
 624                 goto out;
 625         }
 626
 627         dprintk("--> %s clp %p session %p sr_slot %d\n",
 628                 __func__, session->clp, session, res->sr_slot ?
 629                         res->sr_slot->slot_nr : -1);
 630
 631         ret = nfs41_setup_sequence(session, args, res, task);
 632 out:
 633         dprintk("<-- %s status=%d\n", __func__, ret);
 634         return ret;
 635 }
 636
 637 struct nfs41_call_sync_data {
 638         const struct nfs_server *seq_server;
 639         struct nfs4_sequence_args *seq_args;
 640         struct nfs4_sequence_res *seq_res;
 641 };
 642
 643 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 644 {
 645         struct nfs41_call_sync_data *data = calldata;
 646         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 647
 648         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 649
 650         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 651 }
 652
 653 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 654 {
 655         struct nfs41_call_sync_data *data = calldata;
 656
 657         nfs41_sequence_done(task, data->seq_res);
 658 }
 659
 660 static const struct rpc_call_ops nfs41_call_sync_ops = {
 661         .rpc_call_prepare = nfs41_call_sync_prepare,
 662         .rpc_call_done = nfs41_call_sync_done,
 663 };
 664
 665 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 666                                    struct nfs_server *server,
 667                                    struct rpc_message *msg,
 668                                    struct nfs4_sequence_args *args,
 669                                    struct nfs4_sequence_res *res)
 670 {
 671         int ret;
 672         struct rpc_task *task;
 673         struct nfs41_call_sync_data data = {
 674                 .seq_server = server,
 675                 .seq_args = args,
 676                 .seq_res = res,
 677         };
 678         struct rpc_task_setup task_setup = {
 679                 .rpc_client = clnt,
 680                 .rpc_message = msg,
 681                 .callback_ops = &nfs41_call_sync_ops,
 682                 .callback_data = &data
 683         };
 684
 685         task = rpc_run_task(&task_setup);
 686         if (IS_ERR(task))
 687                 ret = PTR_ERR(task);
 688         else {
 689                 ret = task->tk_status;
 690                 rpc_put_task(task);
 691         }
 692         return ret;
 693 }
 694
 695 #else
 696 static
 697 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 698                 struct nfs4_sequence_res *res, int cache_reply)
 699 {
 700 }
 701
 702 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 703 {
 704 }
 705
 706
 707 static int nfs4_sequence_done(struct rpc_task *task,
 708                                struct nfs4_sequence_res *res)
 709 {
 710         return 1;
 711 }
 712 #endif /* CONFIG_NFS_V4_1 */
 713
 714 static
 715 int _nfs4_call_sync(struct rpc_clnt *clnt,
 716                     struct nfs_server *server,
 717                     struct rpc_message *msg,
 718                     struct nfs4_sequence_args *args,
 719                     struct nfs4_sequence_res *res)
 720 {
 721         return rpc_call_sync(clnt, msg, 0);
 722 }
 723
 724 static
 725 int nfs4_call_sync(struct rpc_clnt *clnt,
 726                    struct nfs_server *server,
 727                    struct rpc_message *msg,
 728                    struct nfs4_sequence_args *args,
 729                    struct nfs4_sequence_res *res,
 730                    int cache_reply)
 731 {
 732         nfs41_init_sequence(args, res, cache_reply);
 733         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 734                                                 args, res);
 735 }
 736
 737 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 738 {
 739         struct nfs_inode *nfsi = NFS_I(dir);
 740
 741         spin_lock(&dir->i_lock);
 742         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 743         if (!cinfo->atomic || cinfo->before != dir->i_version)
 744                 nfs_force_lookup_revalidate(dir);
 745         dir->i_version = cinfo->after;
 746         nfs_fscache_invalidate(dir);
 747         spin_unlock(&dir->i_lock);
 748 }
 749
 750 struct nfs4_opendata {
 751         struct kref kref;
 752         struct nfs_openargs o_arg;
 753         struct nfs_openres o_res;
 754         struct nfs_open_confirmargs c_arg;
 755         struct nfs_open_confirmres c_res;
 756         struct nfs4_string owner_name;
 757         struct nfs4_string group_name;
 758         struct nfs_fattr f_attr;
 759         struct dentry *dir;
 760         struct dentry *dentry;
 761         struct nfs4_state_owner *owner;
 762         struct nfs4_state *state;
 763         struct iattr attrs;
 764         unsigned long timestamp;
 765         unsigned int rpc_done : 1;
 766         int rpc_status;
 767         int cancelled;
 768 };
 769
 770
 771 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 772 {
 773         p->o_res.f_attr = &p->f_attr;
 774         p->o_res.seqid = p->o_arg.seqid;
 775         p->c_res.seqid = p->c_arg.seqid;
 776         p->o_res.server = p->o_arg.server;
 777         p->o_res.access_request = p->o_arg.access;
 778         nfs_fattr_init(&p->f_attr);
 779         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 780 }
 781
 782 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 783                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 784                 const struct iattr *attrs,
 785                 gfp_t gfp_mask)
 786 {
 787         struct dentry *parent = dget_parent(dentry);
 788         struct inode *dir = parent->d_inode;
 789         struct nfs_server *server = NFS_SERVER(dir);
 790         struct nfs4_opendata *p;
 791
 792         p = kzalloc(sizeof(*p), gfp_mask);
 793         if (p == NULL)
 794                 goto err;
 795         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 796         if (p->o_arg.seqid == NULL)
 797                 goto err_free;
 798         nfs_sb_active(dentry->d_sb);
 799         p->dentry = dget(dentry);
 800         p->dir = parent;
 801         p->owner = sp;
 802         atomic_inc(&sp->so_count);
 803         p->o_arg.fh = NFS_FH(dir);
 804         p->o_arg.open_flags = flags;
 805         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 806         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 807          * will return permission denied for all bits until close */
 808         if (!(flags & O_EXCL)) {
 809                 /* ask server to check for all possible rights as results
 810                  * are cached */
 811                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 812                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 813         }
 814         p->o_arg.clientid = server->nfs_client->cl_clientid;
 815         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 816         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 817         p->o_arg.name = &dentry->d_name;
 818         p->o_arg.server = server;
 819         p->o_arg.bitmask = server->attr_bitmask;
 820         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 821         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 822         if (attrs != NULL && attrs->ia_valid != 0) {
 823                 __be32 verf[2];
 824
 825                 p->o_arg.u.attrs = &p->attrs;
 826                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 827
 828                 verf[0] = jiffies;
 829                 verf[1] = current->pid;
 830                 memcpy(p->o_arg.u.verifier.data, verf,
 831                                 sizeof(p->o_arg.u.verifier.data));
 832         }
 833         p->c_arg.fh = &p->o_res.fh;
 834         p->c_arg.stateid = &p->o_res.stateid;
 835         p->c_arg.seqid = p->o_arg.seqid;
 836         nfs4_init_opendata_res(p);
 837         kref_init(&p->kref);
 838         return p;
 839 err_free:
 840         kfree(p);
 841 err:
 842         dput(parent);
 843         return NULL;
 844 }
 845
 846 static void nfs4_opendata_free(struct kref *kref)
 847 {
 848         struct nfs4_opendata *p = container_of(kref,
 849                         struct nfs4_opendata, kref);
 850         struct super_block *sb = p->dentry->d_sb;
 851
 852         nfs_free_seqid(p->o_arg.seqid);
 853         if (p->state != NULL)
 854                 nfs4_put_open_state(p->state);
 855         nfs4_put_state_owner(p->owner);
 856         dput(p->dir);
 857         dput(p->dentry);
 858         nfs_sb_deactive(sb);
 859         nfs_fattr_free_names(&p->f_attr);
 860         kfree(p);
 861 }
 862
 863 static void nfs4_opendata_put(struct nfs4_opendata *p)
 864 {
 865         if (p != NULL)
 866                 kref_put(&p->kref, nfs4_opendata_free);
 867 }
 868
 869 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 870 {
 871         int ret;
 872
 873         ret = rpc_wait_for_completion_task(task);
 874         return ret;
 875 }
 876
 877 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 878 {
 879         int ret = 0;
 880
 881         if (open_mode & (O_EXCL|O_TRUNC))
 882                 goto out;
 883         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 884                 case FMODE_READ:
 885                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 886                                 && state->n_rdonly != 0;
 887                         break;
 888                 case FMODE_WRITE:
 889                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 890                                 && state->n_wronly != 0;
 891                         break;
 892                 case FMODE_READ|FMODE_WRITE:
 893                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 894                                 && state->n_rdwr != 0;
 895         }
 896 out:
 897         return ret;
 898 }
 899
 900 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 901 {
 902         if (delegation == NULL)
 903                 return 0;
 904         if ((delegation->type & fmode) != fmode)
 905                 return 0;
 906         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 907                 return 0;
 908         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
 909                 return 0;
 910         nfs_mark_delegation_referenced(delegation);
 911         return 1;
 912 }
 913
 914 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 915 {
 916         switch (fmode) {
 917                 case FMODE_WRITE:
 918                         state->n_wronly++;
 919                         break;
 920                 case FMODE_READ:
 921                         state->n_rdonly++;
 922                         break;
 923                 case FMODE_READ|FMODE_WRITE:
 924                         state->n_rdwr++;
 925         }
 926         nfs4_state_set_mode_locked(state, state->state | fmode);
 927 }
 928
 929 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 930 {
 931         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 932                 nfs4_stateid_copy(&state->stateid, stateid);
 933         nfs4_stateid_copy(&state->open_stateid, stateid);
 934         switch (fmode) {
 935                 case FMODE_READ:
 936                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 937                         break;
 938                 case FMODE_WRITE:
 939                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 940                         break;
 941                 case FMODE_READ|FMODE_WRITE:
 942                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 943         }
 944 }
 945
 946 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 947 {
 948         write_seqlock(&state->seqlock);
 949         nfs_set_open_stateid_locked(state, stateid, fmode);
 950         write_sequnlock(&state->seqlock);
 951 }
 952
 953 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 954 {
 955         /*
 956          * Protect the call to nfs4_state_set_mode_locked and
 957          * serialise the stateid update
 958          */
 959         write_seqlock(&state->seqlock);
 960         if (deleg_stateid != NULL) {
 961                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 962                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 963         }
 964         if (open_stateid != NULL)
 965                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 966         write_sequnlock(&state->seqlock);
 967         spin_lock(&state->owner->so_lock);
 968         update_open_stateflags(state, fmode);
 969         spin_unlock(&state->owner->so_lock);
 970 }
 971
 972 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 973 {
 974         struct nfs_inode *nfsi = NFS_I(state->inode);
 975         struct nfs_delegation *deleg_cur;
 976         int ret = 0;
 977
 978         fmode &= (FMODE_READ|FMODE_WRITE);
 979
 980         rcu_read_lock();
 981         deleg_cur = rcu_dereference(nfsi->delegation);
 982         if (deleg_cur == NULL)
 983                 goto no_delegation;
 984
 985         spin_lock(&deleg_cur->lock);
 986         if (nfsi->delegation != deleg_cur ||
 987            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
 988             (deleg_cur->type & fmode) != fmode)
 989                 goto no_delegation_unlock;
 990
 991         if (delegation == NULL)
 992                 delegation = &deleg_cur->stateid;
 993         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 994                 goto no_delegation_unlock;
 995
 996         nfs_mark_delegation_referenced(deleg_cur);
 997         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 998         ret = 1;
 999 no_delegation_unlock:
1000         spin_unlock(&deleg_cur->lock);
1001 no_delegation:
1002         rcu_read_unlock();
1003
1004         if (!ret && open_stateid != NULL) {
1005                 __update_open_stateid(state, open_stateid, NULL, fmode);
1006                 ret = 1;
1007         }
1008
1009         return ret;
1010 }
1011
1012
1013 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1014 {
1015         struct nfs_delegation *delegation;
1016
1017         rcu_read_lock();
1018         delegation = rcu_dereference(NFS_I(inode)->delegation);
1019         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1020                 rcu_read_unlock();
1021                 return;
1022         }
1023         rcu_read_unlock();
1024         nfs4_inode_return_delegation(inode);
1025 }
1026
1027 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1028 {
1029         struct nfs4_state *state = opendata->state;
1030         struct nfs_inode *nfsi = NFS_I(state->inode);
1031         struct nfs_delegation *delegation;
1032         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1033         fmode_t fmode = opendata->o_arg.fmode;
1034         nfs4_stateid stateid;
1035         int ret = -EAGAIN;
1036
1037         for (;;) {
1038                 if (can_open_cached(state, fmode, open_mode)) {
1039                         spin_lock(&state->owner->so_lock);
1040                         if (can_open_cached(state, fmode, open_mode)) {
1041                                 update_open_stateflags(state, fmode);
1042                                 spin_unlock(&state->owner->so_lock);
1043                                 goto out_return_state;
1044                         }
1045                         spin_unlock(&state->owner->so_lock);
1046                 }
1047                 rcu_read_lock();
1048                 delegation = rcu_dereference(nfsi->delegation);
1049                 if (!can_open_delegated(delegation, fmode)) {
1050                         rcu_read_unlock();
1051                         break;
1052                 }
1053                 /* Save the delegation */
1054                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1055                 rcu_read_unlock();
1056                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1057                 if (ret != 0)
1058                         goto out;
1059                 ret = -EAGAIN;
1060
1061                 /* Try to update the stateid using the delegation */
1062                 if (update_open_stateid(state, NULL, &stateid, fmode))
1063                         goto out_return_state;
1064         }
1065 out:
1066         return ERR_PTR(ret);
1067 out_return_state:
1068         atomic_inc(&state->count);
1069         return state;
1070 }
1071
1072 static void
1073 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1074 {
1075         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1076         struct nfs_delegation *delegation;
1077         int delegation_flags = 0;
1078
1079         rcu_read_lock();
1080         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1081         if (delegation)
1082                 delegation_flags = delegation->flags;
1083         rcu_read_unlock();
1084         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1085                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1086                                    "returning a delegation for "
1087                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1088                                    clp->cl_hostname);
1089         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1090                 nfs_inode_set_delegation(state->inode,
1091                                          data->owner->so_cred,
1092                                          &data->o_res);
1093         else
1094                 nfs_inode_reclaim_delegation(state->inode,
1095                                              data->owner->so_cred,
1096                                              &data->o_res);
1097 }
1098
1099 /*
1100  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1101  * and update the nfs4_state.
1102  */
1103 static struct nfs4_state *
1104 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1105 {
1106         struct inode *inode = data->state->inode;
1107         struct nfs4_state *state = data->state;
1108         int ret;
1109
1110         if (!data->rpc_done) {
1111                 ret = data->rpc_status;
1112                 goto err;
1113         }
1114
1115         ret = -ESTALE;
1116         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1117             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1118             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1119                 goto err;
1120
1121         ret = -ENOMEM;
1122         state = nfs4_get_open_state(inode, data->owner);
1123         if (state == NULL)
1124                 goto err;
1125
1126         ret = nfs_refresh_inode(inode, &data->f_attr);
1127         if (ret)
1128                 goto err;
1129
1130         if (data->o_res.delegation_type != 0)
1131                 nfs4_opendata_check_deleg(data, state);
1132         update_open_stateid(state, &data->o_res.stateid, NULL,
1133                             data->o_arg.fmode);
1134
1135         return state;
1136 err:
1137         return ERR_PTR(ret);
1138
1139 }
1140
1141 static struct nfs4_state *
1142 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1143 {
1144         struct inode *inode;
1145         struct nfs4_state *state = NULL;
1146         int ret;
1147
1148         if (!data->rpc_done) {
1149                 state = nfs4_try_open_cached(data);
1150                 goto out;
1151         }
1152
1153         ret = -EAGAIN;
1154         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1155                 goto err;
1156         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1157         ret = PTR_ERR(inode);
1158         if (IS_ERR(inode))
1159                 goto err;
1160         ret = -ENOMEM;
1161         state = nfs4_get_open_state(inode, data->owner);
1162         if (state == NULL)
1163                 goto err_put_inode;
1164         if (data->o_res.delegation_type != 0)
1165                 nfs4_opendata_check_deleg(data, state);
1166         update_open_stateid(state, &data->o_res.stateid, NULL,
1167                         data->o_arg.fmode);
1168         iput(inode);
1169 out:
1170         nfs_release_seqid(data->o_arg.seqid);
1171         return state;
1172 err_put_inode:
1173         iput(inode);
1174 err:
1175         return ERR_PTR(ret);
1176 }
1177
1178 static struct nfs4_state *
1179 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1180 {
1181         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1182                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1183         return _nfs4_opendata_to_nfs4_state(data);
1184 }
1185
1186 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1187 {
1188         struct nfs_inode *nfsi = NFS_I(state->inode);
1189         struct nfs_open_context *ctx;
1190
1191         spin_lock(&state->inode->i_lock);
1192         list_for_each_entry(ctx, &nfsi->open_files, list) {
1193                 if (ctx->state != state)
1194                         continue;
1195                 get_nfs_open_context(ctx);
1196                 spin_unlock(&state->inode->i_lock);
1197                 return ctx;
1198         }
1199         spin_unlock(&state->inode->i_lock);
1200         return ERR_PTR(-ENOENT);
1201 }
1202
1203 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1204 {
1205         struct nfs4_opendata *opendata;
1206
1207         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1208         if (opendata == NULL)
1209                 return ERR_PTR(-ENOMEM);
1210         opendata->state = state;
1211         atomic_inc(&state->count);
1212         return opendata;
1213 }
1214
1215 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1216 {
1217         struct nfs4_state *newstate;
1218         int ret;
1219
1220         opendata->o_arg.open_flags = 0;
1221         opendata->o_arg.fmode = fmode;
1222         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1223         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1224         nfs4_init_opendata_res(opendata);
1225         ret = _nfs4_recover_proc_open(opendata);
1226         if (ret != 0)
1227                 return ret;
1228         newstate = nfs4_opendata_to_nfs4_state(opendata);
1229         if (IS_ERR(newstate))
1230                 return PTR_ERR(newstate);
1231         nfs4_close_state(newstate, fmode);
1232         *res = newstate;
1233         return 0;
1234 }
1235
1236 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1237 {
1238         struct nfs4_state *newstate;
1239         int ret;
1240
1241         /* memory barrier prior to reading state->n_* */
1242         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1243         smp_rmb();
1244         if (state->n_rdwr != 0) {
1245                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1246                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1247                 if (ret != 0)
1248                         return ret;
1249                 if (newstate != state)
1250                         return -ESTALE;
1251         }
1252         if (state->n_wronly != 0) {
1253                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1254                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1255                 if (ret != 0)
1256                         return ret;
1257                 if (newstate != state)
1258                         return -ESTALE;
1259         }
1260         if (state->n_rdonly != 0) {
1261                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1262                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1263                 if (ret != 0)
1264                         return ret;
1265                 if (newstate != state)
1266                         return -ESTALE;
1267         }
1268         /*
1269          * We may have performed cached opens for all three recoveries.
1270          * Check if we need to update the current stateid.
1271          */
1272         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1273             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1274                 write_seqlock(&state->seqlock);
1275                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1276                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1277                 write_sequnlock(&state->seqlock);
1278         }
1279         return 0;
1280 }
1281
1282 /*
1283  * OPEN_RECLAIM:
1284  *      reclaim state on the server after a reboot.
1285  */
1286 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1287 {
1288         struct nfs_delegation *delegation;
1289         struct nfs4_opendata *opendata;
1290         fmode_t delegation_type = 0;
1291         int status;
1292
1293         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1294         if (IS_ERR(opendata))
1295                 return PTR_ERR(opendata);
1296         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1297         opendata->o_arg.fh = NFS_FH(state->inode);
1298         rcu_read_lock();
1299         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1300         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1301                 delegation_type = delegation->type;
1302         rcu_read_unlock();
1303         opendata->o_arg.u.delegation_type = delegation_type;
1304         status = nfs4_open_recover(opendata, state);
1305         nfs4_opendata_put(opendata);
1306         return status;
1307 }
1308
1309 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1310 {
1311         struct nfs_server *server = NFS_SERVER(state->inode);
1312         struct nfs4_exception exception = { };
1313         int err;
1314         do {
1315                 err = _nfs4_do_open_reclaim(ctx, state);
1316                 if (err != -NFS4ERR_DELAY)
1317                         break;
1318                 nfs4_handle_exception(server, err, &exception);
1319         } while (exception.retry);
1320         return err;
1321 }
1322
1323 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1324 {
1325         struct nfs_open_context *ctx;
1326         int ret;
1327
1328         ctx = nfs4_state_find_open_context(state);
1329         if (IS_ERR(ctx))
1330                 return PTR_ERR(ctx);
1331         ret = nfs4_do_open_reclaim(ctx, state);
1332         put_nfs_open_context(ctx);
1333         return ret;
1334 }
1335
1336 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1337 {
1338         struct nfs4_opendata *opendata;
1339         int ret;
1340
1341         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1342         if (IS_ERR(opendata))
1343                 return PTR_ERR(opendata);
1344         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1345         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1346         ret = nfs4_open_recover(opendata, state);
1347         nfs4_opendata_put(opendata);
1348         return ret;
1349 }
1350
1351 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1352 {
1353         struct nfs4_exception exception = { };
1354         struct nfs_server *server = NFS_SERVER(state->inode);
1355         int err;
1356         do {
1357                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1358                 switch (err) {
1359                         case 0:
1360                         case -ENOENT:
1361                         case -ESTALE:
1362                                 goto out;
1363                         case -NFS4ERR_BADSESSION:
1364                         case -NFS4ERR_BADSLOT:
1365                         case -NFS4ERR_BAD_HIGH_SLOT:
1366                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1367                         case -NFS4ERR_DEADSESSION:
1368                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1369                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1370                                 err = -EAGAIN;
1371                                 goto out;
1372                         case -NFS4ERR_STALE_CLIENTID:
1373                         case -NFS4ERR_STALE_STATEID:
1374                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1375                         case -NFS4ERR_EXPIRED:
1376                                 /* Don't recall a delegation if it was lost */
1377                                 nfs4_schedule_lease_recovery(server->nfs_client);
1378                                 err = -EAGAIN;
1379                                 goto out;
1380                         case -NFS4ERR_DELEG_REVOKED:
1381                         case -NFS4ERR_ADMIN_REVOKED:
1382                         case -NFS4ERR_BAD_STATEID:
1383                                 nfs_inode_find_state_and_recover(state->inode,
1384                                                 stateid);
1385                                 nfs4_schedule_stateid_recovery(server, state);
1386                         case -ENOMEM:
1387                                 err = 0;
1388                                 goto out;
1389                 }
1390                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1391                 err = nfs4_handle_exception(server, err, &exception);
1392         } while (exception.retry);
1393 out:
1394         return err;
1395 }
1396
1397 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1398 {
1399         struct nfs4_opendata *data = calldata;
1400
1401         data->rpc_status = task->tk_status;
1402         if (data->rpc_status == 0) {
1403                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1404                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1405                 renew_lease(data->o_res.server, data->timestamp);
1406                 data->rpc_done = 1;
1407         }
1408 }
1409
1410 static void nfs4_open_confirm_release(void *calldata)
1411 {
1412         struct nfs4_opendata *data = calldata;
1413         struct nfs4_state *state = NULL;
1414
1415         /* If this request hasn't been cancelled, do nothing */
1416         if (data->cancelled == 0)
1417                 goto out_free;
1418         /* In case of error, no cleanup! */
1419         if (!data->rpc_done)
1420                 goto out_free;
1421         state = nfs4_opendata_to_nfs4_state(data);
1422         if (!IS_ERR(state))
1423                 nfs4_close_state(state, data->o_arg.fmode);
1424 out_free:
1425         nfs4_opendata_put(data);
1426 }
1427
1428 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1429         .rpc_call_done = nfs4_open_confirm_done,
1430         .rpc_release = nfs4_open_confirm_release,
1431 };
1432
1433 /*
1434  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1435  */
1436 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1437 {
1438         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1439         struct rpc_task *task;
1440         struct  rpc_message msg = {
1441                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1442                 .rpc_argp = &data->c_arg,
1443                 .rpc_resp = &data->c_res,
1444                 .rpc_cred = data->owner->so_cred,
1445         };
1446         struct rpc_task_setup task_setup_data = {
1447                 .rpc_client = server->client,
1448                 .rpc_message = &msg,
1449                 .callback_ops = &nfs4_open_confirm_ops,
1450                 .callback_data = data,
1451                 .workqueue = nfsiod_workqueue,
1452                 .flags = RPC_TASK_ASYNC,
1453         };
1454         int status;
1455
1456         kref_get(&data->kref);
1457         data->rpc_done = 0;
1458         data->rpc_status = 0;
1459         data->timestamp = jiffies;
1460         task = rpc_run_task(&task_setup_data);
1461         if (IS_ERR(task))
1462                 return PTR_ERR(task);
1463         status = nfs4_wait_for_completion_rpc_task(task);
1464         if (status != 0) {
1465                 data->cancelled = 1;
1466                 smp_wmb();
1467         } else
1468                 status = data->rpc_status;
1469         rpc_put_task(task);
1470         return status;
1471 }
1472
1473 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1474 {
1475         struct nfs4_opendata *data = calldata;
1476         struct nfs4_state_owner *sp = data->owner;
1477
1478         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1479                 goto out_wait;
1480         /*
1481          * Check if we still need to send an OPEN call, or if we can use
1482          * a delegation instead.
1483          */
1484         if (data->state != NULL) {
1485                 struct nfs_delegation *delegation;
1486
1487                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1488                         goto out_no_action;
1489                 rcu_read_lock();
1490                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1491                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1492                     can_open_delegated(delegation, data->o_arg.fmode))
1493                         goto unlock_no_action;
1494                 rcu_read_unlock();
1495         }
1496         /* Update client id. */
1497         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1498         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1499                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1500                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1501                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1502         }
1503         data->timestamp = jiffies;
1504         if (nfs4_setup_sequence(data->o_arg.server,
1505                                 &data->o_arg.seq_args,
1506                                 &data->o_res.seq_res,
1507                                 task) != 0)
1508                 nfs_release_seqid(data->o_arg.seqid);
1509         return;
1510 unlock_no_action:
1511         rcu_read_unlock();
1512 out_no_action:
1513         task->tk_action = NULL;
1514 out_wait:
1515         nfs4_sequence_done(task, &data->o_res.seq_res);
1516 }
1517
1518 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1519 {
1520         struct nfs4_opendata *data = calldata;
1521
1522         data->rpc_status = task->tk_status;
1523
1524         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1525                 return;
1526
1527         if (task->tk_status == 0) {
1528                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1529                         switch (data->o_res.f_attr->mode & S_IFMT) {
1530                         case S_IFREG:
1531                                 break;
1532                         case S_IFLNK:
1533                                 data->rpc_status = -ELOOP;
1534                                 break;
1535                         case S_IFDIR:
1536                                 data->rpc_status = -EISDIR;
1537                                 break;
1538                         default:
1539                                 data->rpc_status = -ENOTDIR;
1540                         }
1541                 }
1542                 renew_lease(data->o_res.server, data->timestamp);
1543                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1544                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1545         }
1546         data->rpc_done = 1;
1547 }
1548
1549 static void nfs4_open_release(void *calldata)
1550 {
1551         struct nfs4_opendata *data = calldata;
1552         struct nfs4_state *state = NULL;
1553
1554         /* If this request hasn't been cancelled, do nothing */
1555         if (data->cancelled == 0)
1556                 goto out_free;
1557         /* In case of error, no cleanup! */
1558         if (data->rpc_status != 0 || !data->rpc_done)
1559                 goto out_free;
1560         /* In case we need an open_confirm, no cleanup! */
1561         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1562                 goto out_free;
1563         state = nfs4_opendata_to_nfs4_state(data);
1564         if (!IS_ERR(state))
1565                 nfs4_close_state(state, data->o_arg.fmode);
1566 out_free:
1567         nfs4_opendata_put(data);
1568 }
1569
1570 static const struct rpc_call_ops nfs4_open_ops = {
1571         .rpc_call_prepare = nfs4_open_prepare,
1572         .rpc_call_done = nfs4_open_done,
1573         .rpc_release = nfs4_open_release,
1574 };
1575
1576 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1577 {
1578         struct inode *dir = data->dir->d_inode;
1579         struct nfs_server *server = NFS_SERVER(dir);
1580         struct nfs_openargs *o_arg = &data->o_arg;
1581         struct nfs_openres *o_res = &data->o_res;
1582         struct rpc_task *task;
1583         struct rpc_message msg = {
1584                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1585                 .rpc_argp = o_arg,
1586                 .rpc_resp = o_res,
1587                 .rpc_cred = data->owner->so_cred,
1588         };
1589         struct rpc_task_setup task_setup_data = {
1590                 .rpc_client = server->client,
1591                 .rpc_message = &msg,
1592                 .callback_ops = &nfs4_open_ops,
1593                 .callback_data = data,
1594                 .workqueue = nfsiod_workqueue,
1595                 .flags = RPC_TASK_ASYNC,
1596         };
1597         int status;
1598
1599         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1600         kref_get(&data->kref);
1601         data->rpc_done = 0;
1602         data->rpc_status = 0;
1603         data->cancelled = 0;
1604         if (isrecover)
1605                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1606         task = rpc_run_task(&task_setup_data);
1607         if (IS_ERR(task))
1608                 return PTR_ERR(task);
1609         status = nfs4_wait_for_completion_rpc_task(task);
1610         if (status != 0) {
1611                 data->cancelled = 1;
1612                 smp_wmb();
1613         } else
1614                 status = data->rpc_status;
1615         rpc_put_task(task);
1616
1617         return status;
1618 }
1619
1620 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1621 {
1622         struct inode *dir = data->dir->d_inode;
1623         struct nfs_openres *o_res = &data->o_res;
1624         int status;
1625
1626         status = nfs4_run_open_task(data, 1);
1627         if (status != 0 || !data->rpc_done)
1628                 return status;
1629
1630         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1631
1632         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1633                 status = _nfs4_proc_open_confirm(data);
1634                 if (status != 0)
1635                         return status;
1636         }
1637
1638         return status;
1639 }
1640
1641 static int nfs4_opendata_access(struct rpc_cred *cred,
1642                                 struct nfs4_opendata *opendata,
1643                                 struct nfs4_state *state, fmode_t fmode,
1644                                 int openflags)
1645 {
1646         struct nfs_access_entry cache;
1647         u32 mask;
1648
1649         /* access call failed or for some reason the server doesn't
1650          * support any access modes -- defer access call until later */
1651         if (opendata->o_res.access_supported == 0)
1652                 return 0;
1653
1654         mask = 0;
1655         /* don't check MAY_WRITE - a newly created file may not have
1656          * write mode bits, but POSIX allows the creating process to write.
1657          * use openflags to check for exec, because fmode won't
1658          * always have FMODE_EXEC set when file open for exec. */
1659         if (openflags & __FMODE_EXEC) {
1660                 /* ONLY check for exec rights */
1661                 mask = MAY_EXEC;
1662         } else if (fmode & FMODE_READ)
1663                 mask = MAY_READ;
1664
1665         cache.cred = cred;
1666         cache.jiffies = jiffies;
1667         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1668         nfs_access_add_cache(state->inode, &cache);
1669
1670         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1671                 return 0;
1672
1673         /* even though OPEN succeeded, access is denied. Close the file */
1674         nfs4_close_state(state, fmode);
1675         return -EACCES;
1676 }
1677
1678 /*
1679  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1680  */
1681 static int _nfs4_proc_open(struct nfs4_opendata *data)
1682 {
1683         struct inode *dir = data->dir->d_inode;
1684         struct nfs_server *server = NFS_SERVER(dir);
1685         struct nfs_openargs *o_arg = &data->o_arg;
1686         struct nfs_openres *o_res = &data->o_res;
1687         int status;
1688
1689         status = nfs4_run_open_task(data, 0);
1690         if (!data->rpc_done)
1691                 return status;
1692         if (status != 0) {
1693                 if (status == -NFS4ERR_BADNAME &&
1694                                 !(o_arg->open_flags & O_CREAT))
1695                         return -ENOENT;
1696                 return status;
1697         }
1698
1699         nfs_fattr_map_and_free_names(server, &data->f_attr);
1700
1701         if (o_arg->open_flags & O_CREAT)
1702                 update_changeattr(dir, &o_res->cinfo);
1703         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1704                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1705         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1706                 status = _nfs4_proc_open_confirm(data);
1707                 if (status != 0)
1708                         return status;
1709         }
1710         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1711                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1712         return 0;
1713 }
1714
1715 static int nfs4_recover_expired_lease(struct nfs_server *server)
1716 {
1717         return nfs4_client_recover_expired_lease(server->nfs_client);
1718 }
1719
1720 /*
1721  * OPEN_EXPIRED:
1722  *      reclaim state on the server after a network partition.
1723  *      Assumes caller holds the appropriate lock
1724  */
1725 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1726 {
1727         struct nfs4_opendata *opendata;
1728         int ret;
1729
1730         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1731         if (IS_ERR(opendata))
1732                 return PTR_ERR(opendata);
1733         ret = nfs4_open_recover(opendata, state);
1734         if (ret == -ESTALE)
1735                 d_drop(ctx->dentry);
1736         nfs4_opendata_put(opendata);
1737         return ret;
1738 }
1739
1740 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1741 {
1742         struct nfs_server *server = NFS_SERVER(state->inode);
1743         struct nfs4_exception exception = { };
1744         int err;
1745
1746         do {
1747                 err = _nfs4_open_expired(ctx, state);
1748                 switch (err) {
1749                 default:
1750                         goto out;
1751                 case -NFS4ERR_GRACE:
1752                 case -NFS4ERR_DELAY:
1753                         nfs4_handle_exception(server, err, &exception);
1754                         err = 0;
1755                 }
1756         } while (exception.retry);
1757 out:
1758         return err;
1759 }
1760
1761 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1762 {
1763         struct nfs_open_context *ctx;
1764         int ret;
1765
1766         ctx = nfs4_state_find_open_context(state);
1767         if (IS_ERR(ctx))
1768                 return PTR_ERR(ctx);
1769         ret = nfs4_do_open_expired(ctx, state);
1770         put_nfs_open_context(ctx);
1771         return ret;
1772 }
1773
1774 #if defined(CONFIG_NFS_V4_1)
1775 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1776 {
1777         struct nfs_server *server = NFS_SERVER(state->inode);
1778         nfs4_stateid *stateid = &state->stateid;
1779         int status;
1780
1781         /* If a state reset has been done, test_stateid is unneeded */
1782         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1783                 return;
1784
1785         status = nfs41_test_stateid(server, stateid);
1786         if (status != NFS_OK) {
1787                 /* Free the stateid unless the server explicitly
1788                  * informs us the stateid is unrecognized. */
1789                 if (status != -NFS4ERR_BAD_STATEID)
1790                         nfs41_free_stateid(server, stateid);
1791                 nfs_remove_bad_delegation(state->inode);
1792
1793                 write_seqlock(&state->seqlock);
1794                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1795                 write_sequnlock(&state->seqlock);
1796                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1797         }
1798 }
1799
1800 /**
1801  * nfs41_check_open_stateid - possibly free an open stateid
1802  *
1803  * @state: NFSv4 state for an inode
1804  *
1805  * Returns NFS_OK if recovery for this stateid is now finished.
1806  * Otherwise a negative NFS4ERR value is returned.
1807  */
1808 static int nfs41_check_open_stateid(struct nfs4_state *state)
1809 {
1810         struct nfs_server *server = NFS_SERVER(state->inode);
1811         nfs4_stateid *stateid = &state->open_stateid;
1812         int status;
1813
1814         /* If a state reset has been done, test_stateid is unneeded */
1815         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1816             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1817             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1818                 return -NFS4ERR_BAD_STATEID;
1819
1820         status = nfs41_test_stateid(server, stateid);
1821         if (status != NFS_OK) {
1822                 /* Free the stateid unless the server explicitly
1823                  * informs us the stateid is unrecognized. */
1824                 if (status != -NFS4ERR_BAD_STATEID)
1825                         nfs41_free_stateid(server, stateid);
1826
1827                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1828                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1829                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1830         }
1831         return status;
1832 }
1833
1834 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1835 {
1836         int status;
1837
1838         nfs41_clear_delegation_stateid(state);
1839         status = nfs41_check_open_stateid(state);
1840         if (status != NFS_OK)
1841                 status = nfs4_open_expired(sp, state);
1842         return status;
1843 }
1844 #endif
1845
1846 /*
1847  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1848  * fields corresponding to attributes that were used to store the verifier.
1849  * Make sure we clobber those fields in the later setattr call
1850  */
1851 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1852 {
1853         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1854             !(sattr->ia_valid & ATTR_ATIME_SET))
1855                 sattr->ia_valid |= ATTR_ATIME;
1856
1857         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1858             !(sattr->ia_valid & ATTR_MTIME_SET))
1859                 sattr->ia_valid |= ATTR_MTIME;
1860 }
1861
1862 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1863                 fmode_t fmode,
1864                 int flags,
1865                 struct nfs4_state **res)
1866 {
1867         struct nfs4_state_owner *sp = opendata->owner;
1868         struct nfs_server *server = sp->so_server;
1869         struct nfs4_state *state;
1870         unsigned int seq;
1871         int ret;
1872
1873         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1874
1875         ret = _nfs4_proc_open(opendata);
1876         if (ret != 0)
1877                 goto out;
1878
1879         state = nfs4_opendata_to_nfs4_state(opendata);
1880         ret = PTR_ERR(state);
1881         if (IS_ERR(state))
1882                 goto out;
1883         if (server->caps & NFS_CAP_POSIX_LOCK)
1884                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1885
1886         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1887         if (ret != 0)
1888                 goto out;
1889
1890         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
1891                 nfs4_schedule_stateid_recovery(server, state);
1892                 nfs4_wait_clnt_recover(server->nfs_client);
1893         }
1894         *res = state;
1895 out:
1896         return ret;
1897 }
1898
1899 /*
1900  * Returns a referenced nfs4_state
1901  */
1902 static int _nfs4_do_open(struct inode *dir,
1903                         struct dentry *dentry,
1904                         fmode_t fmode,
1905                         int flags,
1906                         struct iattr *sattr,
1907                         struct rpc_cred *cred,
1908                         struct nfs4_state **res,
1909                         struct nfs4_threshold **ctx_th)
1910 {
1911         struct nfs4_state_owner  *sp;
1912         struct nfs4_state     *state = NULL;
1913         struct nfs_server       *server = NFS_SERVER(dir);
1914         struct nfs4_opendata *opendata;
1915         int status;
1916
1917         /* Protect against reboot recovery conflicts */
1918         status = -ENOMEM;
1919         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1920         if (sp == NULL) {
1921                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1922                 goto out_err;
1923         }
1924         status = nfs4_recover_expired_lease(server);
1925         if (status != 0)
1926                 goto err_put_state_owner;
1927         if (dentry->d_inode != NULL)
1928                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1929         status = -ENOMEM;
1930         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1931         if (opendata == NULL)
1932                 goto err_put_state_owner;
1933
1934         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1935                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1936                 if (!opendata->f_attr.mdsthreshold)
1937                         goto err_opendata_put;
1938                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1939         }
1940         if (dentry->d_inode != NULL)
1941                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1942
1943         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
1944         if (status != 0)
1945                 goto err_opendata_put;
1946
1947         if (opendata->o_arg.open_flags & O_EXCL) {
1948                 nfs4_exclusive_attrset(opendata, sattr);
1949
1950                 nfs_fattr_init(opendata->o_res.f_attr);
1951                 status = nfs4_do_setattr(state->inode, cred,
1952                                 opendata->o_res.f_attr, sattr,
1953                                 state);
1954                 if (status == 0)
1955                         nfs_setattr_update_inode(state->inode, sattr);
1956                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1957         }
1958
1959         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1960                 *ctx_th = opendata->f_attr.mdsthreshold;
1961         else
1962                 kfree(opendata->f_attr.mdsthreshold);
1963         opendata->f_attr.mdsthreshold = NULL;
1964
1965         nfs4_opendata_put(opendata);
1966         nfs4_put_state_owner(sp);
1967         *res = state;
1968         return 0;
1969 err_opendata_put:
1970         kfree(opendata->f_attr.mdsthreshold);
1971         nfs4_opendata_put(opendata);
1972 err_put_state_owner:
1973         nfs4_put_state_owner(sp);
1974 out_err:
1975         *res = NULL;
1976         return status;
1977 }
1978
1979
1980 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1981                                         struct dentry *dentry,
1982                                         fmode_t fmode,
1983                                         int flags,
1984                                         struct iattr *sattr,
1985                                         struct rpc_cred *cred,
1986                                         struct nfs4_threshold **ctx_th)
1987 {
1988         struct nfs4_exception exception = { };
1989         struct nfs4_state *res;
1990         int status;
1991
1992         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1993         do {
1994                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1995                                        &res, ctx_th);
1996                 if (status == 0)
1997                         break;
1998                 /* NOTE: BAD_SEQID means the server and client disagree about the
1999                  * book-keeping w.r.t. state-changing operations
2000                  * (OPEN/CLOSE/LOCK/LOCKU...)
2001                  * It is actually a sign of a bug on the client or on the server.
2002                  *
2003                  * If we receive a BAD_SEQID error in the particular case of
2004                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2005                  * have unhashed the old state_owner for us, and that we can
2006                  * therefore safely retry using a new one. We should still warn
2007                  * the user though...
2008                  */
2009                 if (status == -NFS4ERR_BAD_SEQID) {
2010                         pr_warn_ratelimited("NFS: v4 server %s "
2011                                         " returned a bad sequence-id error!\n",
2012                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2013                         exception.retry = 1;
2014                         continue;
2015                 }
2016                 /*
2017                  * BAD_STATEID on OPEN means that the server cancelled our
2018                  * state before it received the OPEN_CONFIRM.
2019                  * Recover by retrying the request as per the discussion
2020                  * on Page 181 of RFC3530.
2021                  */
2022                 if (status == -NFS4ERR_BAD_STATEID) {
2023                         exception.retry = 1;
2024                         continue;
2025                 }
2026                 if (status == -EAGAIN) {
2027                         /* We must have found a delegation */
2028                         exception.retry = 1;
2029                         continue;
2030                 }
2031                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
2032                                         status, &exception));
2033         } while (exception.retry);
2034         return res;
2035 }
2036
2037 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2038                             struct nfs_fattr *fattr, struct iattr *sattr,
2039                             struct nfs4_state *state)
2040 {
2041         struct nfs_server *server = NFS_SERVER(inode);
2042         struct nfs_setattrargs  arg = {
2043                 .fh             = NFS_FH(inode),
2044                 .iap            = sattr,
2045                 .server         = server,
2046                 .bitmask = server->attr_bitmask,
2047         };
2048         struct nfs_setattrres  res = {
2049                 .fattr          = fattr,
2050                 .server         = server,
2051         };
2052         struct rpc_message msg = {
2053                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2054                 .rpc_argp       = &arg,
2055                 .rpc_resp       = &res,
2056                 .rpc_cred       = cred,
2057         };
2058         unsigned long timestamp = jiffies;
2059         int status;
2060
2061         nfs_fattr_init(fattr);
2062
2063         if (state != NULL && nfs4_valid_open_stateid(state)) {
2064                 struct nfs_lockowner lockowner = {
2065                         .l_owner = current->files,
2066                         .l_pid = current->tgid,
2067                 };
2068                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2069                                 &lockowner);
2070         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2071                                 FMODE_WRITE)) {
2072                 /* Use that stateid */
2073         } else
2074                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2075
2076         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2077         if (status == 0 && state != NULL)
2078                 renew_lease(server, timestamp);
2079         return status;
2080 }
2081
2082 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2083                            struct nfs_fattr *fattr, struct iattr *sattr,
2084                            struct nfs4_state *state)
2085 {
2086         struct nfs_server *server = NFS_SERVER(inode);
2087         struct nfs4_exception exception = {
2088                 .state = state,
2089                 .inode = inode,
2090         };
2091         int err;
2092         do {
2093                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2094                 switch (err) {
2095                 case -NFS4ERR_OPENMODE:
2096                         if (state && !(state->state & FMODE_WRITE)) {
2097                                 err = -EBADF;
2098                                 if (sattr->ia_valid & ATTR_OPEN)
2099                                         err = -EACCES;
2100                                 goto out;
2101                         }
2102                 }
2103                 err = nfs4_handle_exception(server, err, &exception);
2104         } while (exception.retry);
2105 out:
2106         return err;
2107 }
2108
2109 struct nfs4_closedata {
2110         struct inode *inode;
2111         struct nfs4_state *state;
2112         struct nfs_closeargs arg;
2113         struct nfs_closeres res;
2114         struct nfs_fattr fattr;
2115         unsigned long timestamp;
2116         bool roc;
2117         u32 roc_barrier;
2118 };
2119
2120 static void nfs4_free_closedata(void *data)
2121 {
2122         struct nfs4_closedata *calldata = data;
2123         struct nfs4_state_owner *sp = calldata->state->owner;
2124         struct super_block *sb = calldata->state->inode->i_sb;
2125
2126         if (calldata->roc)
2127                 pnfs_roc_release(calldata->state->inode);
2128         nfs4_put_open_state(calldata->state);
2129         nfs_free_seqid(calldata->arg.seqid);
2130         nfs4_put_state_owner(sp);
2131         nfs_sb_deactive(sb);
2132         kfree(calldata);
2133 }
2134
2135 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2136                 fmode_t fmode)
2137 {
2138         spin_lock(&state->owner->so_lock);
2139         if (!(fmode & FMODE_READ))
2140                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2141         if (!(fmode & FMODE_WRITE))
2142                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2143         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2144         spin_unlock(&state->owner->so_lock);
2145 }
2146
2147 static void nfs4_close_done(struct rpc_task *task, void *data)
2148 {
2149         struct nfs4_closedata *calldata = data;
2150         struct nfs4_state *state = calldata->state;
2151         struct nfs_server *server = NFS_SERVER(calldata->inode);
2152
2153         dprintk("%s: begin!\n", __func__);
2154         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2155                 return;
2156         /* hmm. we are done with the inode, and in the process of freeing
2157          * the state_owner. we keep this around to process errors
2158          */
2159         switch (task->tk_status) {
2160                 case 0:
2161                         if (calldata->roc)
2162                                 pnfs_roc_set_barrier(state->inode,
2163                                                      calldata->roc_barrier);
2164                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2165                         renew_lease(server, calldata->timestamp);
2166                         nfs4_close_clear_stateid_flags(state,
2167                                         calldata->arg.fmode);
2168                         break;
2169                 case -NFS4ERR_STALE_STATEID:
2170                 case -NFS4ERR_OLD_STATEID:
2171                 case -NFS4ERR_BAD_STATEID:
2172                 case -NFS4ERR_EXPIRED:
2173                         if (calldata->arg.fmode == 0)
2174                                 break;
2175                 default:
2176                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2177                                 rpc_restart_call_prepare(task);
2178         }
2179         nfs_release_seqid(calldata->arg.seqid);
2180         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2181         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2182 }
2183
2184 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2185 {
2186         struct nfs4_closedata *calldata = data;
2187         struct nfs4_state *state = calldata->state;
2188         struct inode *inode = calldata->inode;
2189         int call_close = 0;
2190
2191         dprintk("%s: begin!\n", __func__);
2192         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2193                 goto out_wait;
2194
2195         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2196         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2197         spin_lock(&state->owner->so_lock);
2198         /* Calculate the change in open mode */
2199         if (state->n_rdwr == 0) {
2200                 if (state->n_rdonly == 0) {
2201                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2202                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2203                         calldata->arg.fmode &= ~FMODE_READ;
2204                 }
2205                 if (state->n_wronly == 0) {
2206                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2207                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2208                         calldata->arg.fmode &= ~FMODE_WRITE;
2209                 }
2210         }
2211         if (!nfs4_valid_open_stateid(state))
2212                 call_close = 0;
2213         spin_unlock(&state->owner->so_lock);
2214
2215         if (!call_close) {
2216                 /* Note: exit _without_ calling nfs4_close_done */
2217                 goto out_no_action;
2218         }
2219
2220         if (calldata->arg.fmode == 0) {
2221                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2222                 if (calldata->roc &&
2223                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2224                         goto out_wait;
2225         }
2226
2227         nfs_fattr_init(calldata->res.fattr);
2228         calldata->timestamp = jiffies;
2229         if (nfs4_setup_sequence(NFS_SERVER(inode),
2230                                 &calldata->arg.seq_args,
2231                                 &calldata->res.seq_res,
2232                                 task) != 0)
2233                 nfs_release_seqid(calldata->arg.seqid);
2234         dprintk("%s: done!\n", __func__);
2235         return;
2236 out_no_action:
2237         task->tk_action = NULL;
2238 out_wait:
2239         nfs4_sequence_done(task, &calldata->res.seq_res);
2240 }
2241
2242 static const struct rpc_call_ops nfs4_close_ops = {
2243         .rpc_call_prepare = nfs4_close_prepare,
2244         .rpc_call_done = nfs4_close_done,
2245         .rpc_release = nfs4_free_closedata,
2246 };
2247
2248 /*
2249  * It is possible for data to be read/written from a mem-mapped file
2250  * after the sys_close call (which hits the vfs layer as a flush).
2251  * This means that we can't safely call nfsv4 close on a file until
2252  * the inode is cleared. This in turn means that we are not good
2253  * NFSv4 citizens - we do not indicate to the server to update the file's
2254  * share state even when we are done with one of the three share
2255  * stateid's in the inode.
2256  *
2257  * NOTE: Caller must be holding the sp->so_owner semaphore!
2258  */
2259 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2260 {
2261         struct nfs_server *server = NFS_SERVER(state->inode);
2262         struct nfs4_closedata *calldata;
2263         struct nfs4_state_owner *sp = state->owner;
2264         struct rpc_task *task;
2265         struct rpc_message msg = {
2266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2267                 .rpc_cred = state->owner->so_cred,
2268         };
2269         struct rpc_task_setup task_setup_data = {
2270                 .rpc_client = server->client,
2271                 .rpc_message = &msg,
2272                 .callback_ops = &nfs4_close_ops,
2273                 .workqueue = nfsiod_workqueue,
2274                 .flags = RPC_TASK_ASYNC,
2275         };
2276         int status = -ENOMEM;
2277
2278         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2279         if (calldata == NULL)
2280                 goto out;
2281         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2282         calldata->inode = state->inode;
2283         calldata->state = state;
2284         calldata->arg.fh = NFS_FH(state->inode);
2285         calldata->arg.stateid = &state->open_stateid;
2286         /* Serialization for the sequence id */
2287         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2288         if (calldata->arg.seqid == NULL)
2289                 goto out_free_calldata;
2290         calldata->arg.fmode = 0;
2291         calldata->arg.bitmask = server->cache_consistency_bitmask;
2292         calldata->res.fattr = &calldata->fattr;
2293         calldata->res.seqid = calldata->arg.seqid;
2294         calldata->res.server = server;
2295         calldata->roc = pnfs_roc(state->inode);
2296         nfs_sb_active(calldata->inode->i_sb);
2297
2298         msg.rpc_argp = &calldata->arg;
2299         msg.rpc_resp = &calldata->res;
2300         task_setup_data.callback_data = calldata;
2301         task = rpc_run_task(&task_setup_data);
2302         if (IS_ERR(task))
2303                 return PTR_ERR(task);
2304         status = 0;
2305         if (wait)
2306                 status = rpc_wait_for_completion_task(task);
2307         rpc_put_task(task);
2308         return status;
2309 out_free_calldata:
2310         kfree(calldata);
2311 out:
2312         nfs4_put_open_state(state);
2313         nfs4_put_state_owner(sp);
2314         return status;
2315 }
2316
2317 static struct inode *
2318 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2319 {
2320         struct nfs4_state *state;
2321
2322         /* Protect against concurrent sillydeletes */
2323         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2324                              ctx->cred, &ctx->mdsthreshold);
2325         if (IS_ERR(state))
2326                 return ERR_CAST(state);
2327         ctx->state = state;
2328         return igrab(state->inode);
2329 }
2330
2331 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2332 {
2333         if (ctx->state == NULL)
2334                 return;
2335         if (is_sync)
2336                 nfs4_close_sync(ctx->state, ctx->mode);
2337         else
2338                 nfs4_close_state(ctx->state, ctx->mode);
2339 }
2340
2341 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2342 {
2343         struct nfs4_server_caps_arg args = {
2344                 .fhandle = fhandle,
2345         };
2346         struct nfs4_server_caps_res res = {};
2347         struct rpc_message msg = {
2348                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2349                 .rpc_argp = &args,
2350                 .rpc_resp = &res,
2351         };
2352         int status;
2353
2354         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2355         if (status == 0) {
2356                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2357                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2358                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2359                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2360                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2361                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2362                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2363                         server->caps |= NFS_CAP_ACLS;
2364                 if (res.has_links != 0)
2365                         server->caps |= NFS_CAP_HARDLINKS;
2366                 if (res.has_symlinks != 0)
2367                         server->caps |= NFS_CAP_SYMLINKS;
2368                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2369                         server->caps |= NFS_CAP_FILEID;
2370                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2371                         server->caps |= NFS_CAP_MODE;
2372                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2373                         server->caps |= NFS_CAP_NLINK;
2374                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2375                         server->caps |= NFS_CAP_OWNER;
2376                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2377                         server->caps |= NFS_CAP_OWNER_GROUP;
2378                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2379                         server->caps |= NFS_CAP_ATIME;
2380                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2381                         server->caps |= NFS_CAP_CTIME;
2382                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2383                         server->caps |= NFS_CAP_MTIME;
2384
2385                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2386                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2387                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2388                 server->acl_bitmask = res.acl_bitmask;
2389                 server->fh_expire_type = res.fh_expire_type;
2390         }
2391
2392         return status;
2393 }
2394
2395 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2396 {
2397         struct nfs4_exception exception = { };
2398         int err;
2399         do {
2400                 err = nfs4_handle_exception(server,
2401                                 _nfs4_server_capabilities(server, fhandle),
2402                                 &exception);
2403         } while (exception.retry);
2404         return err;
2405 }
2406
2407 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2408                 struct nfs_fsinfo *info)
2409 {
2410         struct nfs4_lookup_root_arg args = {
2411                 .bitmask = nfs4_fattr_bitmap,
2412         };
2413         struct nfs4_lookup_res res = {
2414                 .server = server,
2415                 .fattr = info->fattr,
2416                 .fh = fhandle,
2417         };
2418         struct rpc_message msg = {
2419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2420                 .rpc_argp = &args,
2421                 .rpc_resp = &res,
2422         };
2423
2424         nfs_fattr_init(info->fattr);
2425         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2426 }
2427
2428 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2429                 struct nfs_fsinfo *info)
2430 {
2431         struct nfs4_exception exception = { };
2432         int err;
2433         do {
2434                 err = _nfs4_lookup_root(server, fhandle, info);
2435                 switch (err) {
2436                 case 0:
2437                 case -NFS4ERR_WRONGSEC:
2438                         goto out;
2439                 default:
2440                         err = nfs4_handle_exception(server, err, &exception);
2441                 }
2442         } while (exception.retry);
2443 out:
2444         return err;
2445 }
2446
2447 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2448                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2449 {
2450         struct rpc_auth *auth;
2451         int ret;
2452
2453         auth = rpcauth_create(flavor, server->client);
2454         if (IS_ERR(auth)) {
2455                 ret = -EIO;
2456                 goto out;
2457         }
2458         ret = nfs4_lookup_root(server, fhandle, info);
2459 out:
2460         return ret;
2461 }
2462
2463 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2464                               struct nfs_fsinfo *info)
2465 {
2466         int i, len, status = 0;
2467         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2468
2469         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2470         if (len < 0)
2471                 return len;
2472
2473         for (i = 0; i < len; i++) {
2474                 /* AUTH_UNIX is the default flavor if none was specified,
2475                  * thus has already been tried. */
2476                 if (flav_array[i] == RPC_AUTH_UNIX)
2477                         continue;
2478
2479                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2480                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2481                         continue;
2482                 break;
2483         }
2484         /*
2485          * -EACCESS could mean that the user doesn't have correct permissions
2486          * to access the mount.  It could also mean that we tried to mount
2487          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2488          * existing mount programs don't handle -EACCES very well so it should
2489          * be mapped to -EPERM instead.
2490          */
2491         if (status == -EACCES)
2492                 status = -EPERM;
2493         return status;
2494 }
2495
2496 /*
2497  * get the file handle for the "/" directory on the server
2498  */
2499 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2500                          struct nfs_fsinfo *info)
2501 {
2502         int minor_version = server->nfs_client->cl_minorversion;
2503         int status = nfs4_lookup_root(server, fhandle, info);
2504         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2505                 /*
2506                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2507                  * by nfs4_map_errors() as this function exits.
2508                  */
2509                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2510         if (status == 0)
2511                 status = nfs4_server_capabilities(server, fhandle);
2512         if (status == 0)
2513                 status = nfs4_do_fsinfo(server, fhandle, info);
2514         return nfs4_map_errors(status);
2515 }
2516
2517 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2518                               struct nfs_fsinfo *info)
2519 {
2520         int error;
2521         struct nfs_fattr *fattr = info->fattr;
2522
2523         error = nfs4_server_capabilities(server, mntfh);
2524         if (error < 0) {
2525                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2526                 return error;
2527         }
2528
2529         error = nfs4_proc_getattr(server, mntfh, fattr);
2530         if (error < 0) {
2531                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2532                 return error;
2533         }
2534
2535         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2536             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2537                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2538
2539         return error;
2540 }
2541
2542 /*
2543  * Get locations and (maybe) other attributes of a referral.
2544  * Note that we'll actually follow the referral later when
2545  * we detect fsid mismatch in inode revalidation
2546  */
2547 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2548                              const struct qstr *name, struct nfs_fattr *fattr,
2549                              struct nfs_fh *fhandle)
2550 {
2551         int status = -ENOMEM;
2552         struct page *page = NULL;
2553         struct nfs4_fs_locations *locations = NULL;
2554
2555         page = alloc_page(GFP_KERNEL);
2556         if (page == NULL)
2557                 goto out;
2558         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2559         if (locations == NULL)
2560                 goto out;
2561
2562         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2563         if (status != 0)
2564                 goto out;
2565         /* Make sure server returned a different fsid for the referral */
2566         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2567                 dprintk("%s: server did not return a different fsid for"
2568                         " a referral at %s\n", __func__, name->name);
2569                 status = -EIO;
2570                 goto out;
2571         }
2572         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2573         nfs_fixup_referral_attributes(&locations->fattr);
2574
2575         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2576         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2577         memset(fhandle, 0, sizeof(struct nfs_fh));
2578 out:
2579         if (page)
2580                 __free_page(page);
2581         kfree(locations);
2582         return status;
2583 }
2584
2585 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2586 {
2587         struct nfs4_getattr_arg args = {
2588                 .fh = fhandle,
2589                 .bitmask = server->attr_bitmask,
2590         };
2591         struct nfs4_getattr_res res = {
2592                 .fattr = fattr,
2593                 .server = server,
2594         };
2595         struct rpc_message msg = {
2596                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2597                 .rpc_argp = &args,
2598                 .rpc_resp = &res,
2599         };
2600
2601         nfs_fattr_init(fattr);
2602         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2603 }
2604
2605 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2606 {
2607         struct nfs4_exception exception = { };
2608         int err;
2609         do {
2610                 err = nfs4_handle_exception(server,
2611                                 _nfs4_proc_getattr(server, fhandle, fattr),
2612                                 &exception);
2613         } while (exception.retry);
2614         return err;
2615 }
2616
2617 /*
2618  * The file is not closed if it is opened due to the a request to change
2619  * the size of the file. The open call will not be needed once the
2620  * VFS layer lookup-intents are implemented.
2621  *
2622  * Close is called when the inode is destroyed.
2623  * If we haven't opened the file for O_WRONLY, we
2624  * need to in the size_change case to obtain a stateid.
2625  *
2626  * Got race?
2627  * Because OPEN is always done by name in nfsv4, it is
2628  * possible that we opened a different file by the same
2629  * name.  We can recognize this race condition, but we
2630  * can't do anything about it besides returning an error.
2631  *
2632  * This will be fixed with VFS changes (lookup-intent).
2633  */
2634 static int
2635 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2636                   struct iattr *sattr)
2637 {
2638         struct inode *inode = dentry->d_inode;
2639         struct rpc_cred *cred = NULL;
2640         struct nfs4_state *state = NULL;
2641         int status;
2642
2643         if (pnfs_ld_layoutret_on_setattr(inode))
2644                 pnfs_commit_and_return_layout(inode);
2645
2646         nfs_fattr_init(fattr);
2647
2648         /* Deal with open(O_TRUNC) */
2649         if (sattr->ia_valid & ATTR_OPEN)
2650                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2651
2652         /* Optimization: if the end result is no change, don't RPC */
2653         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2654                 return 0;
2655
2656         /* Search for an existing open(O_WRITE) file */
2657         if (sattr->ia_valid & ATTR_FILE) {
2658                 struct nfs_open_context *ctx;
2659
2660                 ctx = nfs_file_open_context(sattr->ia_file);
2661                 if (ctx) {
2662                         cred = ctx->cred;
2663                         state = ctx->state;
2664                 }
2665         }
2666
2667         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2668         if (status == 0)
2669                 nfs_setattr_update_inode(inode, sattr);
2670         return status;
2671 }
2672
2673 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2674                 const struct qstr *name, struct nfs_fh *fhandle,
2675                 struct nfs_fattr *fattr)
2676 {
2677         struct nfs_server *server = NFS_SERVER(dir);
2678         int                    status;
2679         struct nfs4_lookup_arg args = {
2680                 .bitmask = server->attr_bitmask,
2681                 .dir_fh = NFS_FH(dir),
2682                 .name = name,
2683         };
2684         struct nfs4_lookup_res res = {
2685                 .server = server,
2686                 .fattr = fattr,
2687                 .fh = fhandle,
2688         };
2689         struct rpc_message msg = {
2690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2691                 .rpc_argp = &args,
2692                 .rpc_resp = &res,
2693         };
2694
2695         nfs_fattr_init(fattr);
2696
2697         dprintk("NFS call  lookup %s\n", name->name);
2698         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2699         dprintk("NFS reply lookup: %d\n", status);
2700         return status;
2701 }
2702
2703 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2704 {
2705         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2706                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2707         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2708         fattr->nlink = 2;
2709 }
2710
2711 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2712                                    struct qstr *name, struct nfs_fh *fhandle,
2713                                    struct nfs_fattr *fattr)
2714 {
2715         struct nfs4_exception exception = { };
2716         struct rpc_clnt *client = *clnt;
2717         int err;
2718         do {
2719                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2720                 switch (err) {
2721                 case -NFS4ERR_BADNAME:
2722                         err = -ENOENT;
2723                         goto out;
2724                 case -NFS4ERR_MOVED:
2725                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2726                         goto out;
2727                 case -NFS4ERR_WRONGSEC:
2728                         err = -EPERM;
2729                         if (client != *clnt)
2730                                 goto out;
2731
2732                         client = nfs4_create_sec_client(client, dir, name);
2733                         if (IS_ERR(client))
2734                                 return PTR_ERR(client);
2735
2736                         exception.retry = 1;
2737                         break;
2738                 default:
2739                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2740                 }
2741         } while (exception.retry);
2742
2743 out:
2744         if (err == 0)
2745                 *clnt = client;
2746         else if (client != *clnt)
2747                 rpc_shutdown_client(client);
2748
2749         return err;
2750 }
2751
2752 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2753                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2754 {
2755         int status;
2756         struct rpc_clnt *client = NFS_CLIENT(dir);
2757
2758         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2759         if (client != NFS_CLIENT(dir)) {
2760                 rpc_shutdown_client(client);
2761                 nfs_fixup_secinfo_attributes(fattr);
2762         }
2763         return status;
2764 }
2765
2766 struct rpc_clnt *
2767 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2768                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2769 {
2770         int status;
2771         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2772
2773         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2774         if (status < 0) {
2775                 rpc_shutdown_client(client);
2776                 return ERR_PTR(status);
2777         }
2778         return client;
2779 }
2780
2781 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2782 {
2783         struct nfs_server *server = NFS_SERVER(inode);
2784         struct nfs4_accessargs args = {
2785                 .fh = NFS_FH(inode),
2786                 .bitmask = server->cache_consistency_bitmask,
2787         };
2788         struct nfs4_accessres res = {
2789                 .server = server,
2790         };
2791         struct rpc_message msg = {
2792                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2793                 .rpc_argp = &args,
2794                 .rpc_resp = &res,
2795                 .rpc_cred = entry->cred,
2796         };
2797         int mode = entry->mask;
2798         int status;
2799
2800         /*
2801          * Determine which access bits we want to ask for...
2802          */
2803         if (mode & MAY_READ)
2804                 args.access |= NFS4_ACCESS_READ;
2805         if (S_ISDIR(inode->i_mode)) {
2806                 if (mode & MAY_WRITE)
2807                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2808                 if (mode & MAY_EXEC)
2809                         args.access |= NFS4_ACCESS_LOOKUP;
2810         } else {
2811                 if (mode & MAY_WRITE)
2812                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2813                 if (mode & MAY_EXEC)
2814                         args.access |= NFS4_ACCESS_EXECUTE;
2815         }
2816
2817         res.fattr = nfs_alloc_fattr();
2818         if (res.fattr == NULL)
2819                 return -ENOMEM;
2820
2821         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2822         if (!status) {
2823                 nfs_access_set_mask(entry, res.access);
2824                 nfs_refresh_inode(inode, res.fattr);
2825         }
2826         nfs_free_fattr(res.fattr);
2827         return status;
2828 }
2829
2830 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2831 {
2832         struct nfs4_exception exception = { };
2833         int err;
2834         do {
2835                 err = nfs4_handle_exception(NFS_SERVER(inode),
2836                                 _nfs4_proc_access(inode, entry),
2837                                 &exception);
2838         } while (exception.retry);
2839         return err;
2840 }
2841
2842 /*
2843  * TODO: For the time being, we don't try to get any attributes
2844  * along with any of the zero-copy operations READ, READDIR,
2845  * READLINK, WRITE.
2846  *
2847  * In the case of the first three, we want to put the GETATTR
2848  * after the read-type operation -- this is because it is hard
2849  * to predict the length of a GETATTR response in v4, and thus
2850  * align the READ data correctly.  This means that the GETATTR
2851  * may end up partially falling into the page cache, and we should
2852  * shift it into the 'tail' of the xdr_buf before processing.
2853  * To do this efficiently, we need to know the total length
2854  * of data received, which doesn't seem to be available outside
2855  * of the RPC layer.
2856  *
2857  * In the case of WRITE, we also want to put the GETATTR after
2858  * the operation -- in this case because we want to make sure
2859  * we get the post-operation mtime and size.
2860  *
2861  * Both of these changes to the XDR layer would in fact be quite
2862  * minor, but I decided to leave them for a subsequent patch.
2863  */
2864 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2865                 unsigned int pgbase, unsigned int pglen)
2866 {
2867         struct nfs4_readlink args = {
2868                 .fh       = NFS_FH(inode),
2869                 .pgbase   = pgbase,
2870                 .pglen    = pglen,
2871                 .pages    = &page,
2872         };
2873         struct nfs4_readlink_res res;
2874         struct rpc_message msg = {
2875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2876                 .rpc_argp = &args,
2877                 .rpc_resp = &res,
2878         };
2879
2880         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2881 }
2882
2883 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2884                 unsigned int pgbase, unsigned int pglen)
2885 {
2886         struct nfs4_exception exception = { };
2887         int err;
2888         do {
2889                 err = nfs4_handle_exception(NFS_SERVER(inode),
2890                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2891                                 &exception);
2892         } while (exception.retry);
2893         return err;
2894 }
2895
2896 /*
2897  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2898  */
2899 static int
2900 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2901                  int flags)
2902 {
2903         struct nfs_open_context *ctx;
2904         struct nfs4_state *state;
2905         int status = 0;
2906
2907         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2908         if (IS_ERR(ctx))
2909                 return PTR_ERR(ctx);
2910
2911         sattr->ia_mode &= ~current_umask();
2912         state = nfs4_do_open(dir, dentry, ctx->mode,
2913                         flags, sattr, ctx->cred,
2914                         &ctx->mdsthreshold);
2915         d_drop(dentry);
2916         if (IS_ERR(state)) {
2917                 status = PTR_ERR(state);
2918                 goto out;
2919         }
2920         d_add(dentry, igrab(state->inode));
2921         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2922         ctx->state = state;
2923 out:
2924         put_nfs_open_context(ctx);
2925         return status;
2926 }
2927
2928 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2929 {
2930         struct nfs_server *server = NFS_SERVER(dir);
2931         struct nfs_removeargs args = {
2932                 .fh = NFS_FH(dir),
2933                 .name = *name,
2934         };
2935         struct nfs_removeres res = {
2936                 .server = server,
2937         };
2938         struct rpc_message msg = {
2939                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2940                 .rpc_argp = &args,
2941                 .rpc_resp = &res,
2942         };
2943         int status;
2944
2945         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2946         if (status == 0)
2947                 update_changeattr(dir, &res.cinfo);
2948         return status;
2949 }
2950
2951 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2952 {
2953         struct nfs4_exception exception = { };
2954         int err;
2955         do {
2956                 err = nfs4_handle_exception(NFS_SERVER(dir),
2957                                 _nfs4_proc_remove(dir, name),
2958                                 &exception);
2959         } while (exception.retry);
2960         return err;
2961 }
2962
2963 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2964 {
2965         struct nfs_server *server = NFS_SERVER(dir);
2966         struct nfs_removeargs *args = msg->rpc_argp;
2967         struct nfs_removeres *res = msg->rpc_resp;
2968
2969         res->server = server;
2970         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2971         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2972 }
2973
2974 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2975 {
2976         nfs4_setup_sequence(NFS_SERVER(data->dir),
2977                         &data->args.seq_args,
2978                         &data->res.seq_res,
2979                         task);
2980 }
2981
2982 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2983 {
2984         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2985
2986         if (!nfs4_sequence_done(task, &res->seq_res))
2987                 return 0;
2988         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2989                 return 0;
2990         update_changeattr(dir, &res->cinfo);
2991         return 1;
2992 }
2993
2994 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2995 {
2996         struct nfs_server *server = NFS_SERVER(dir);
2997         struct nfs_renameargs *arg = msg->rpc_argp;
2998         struct nfs_renameres *res = msg->rpc_resp;
2999
3000         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3001         res->server = server;
3002         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3003 }
3004
3005 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3006 {
3007         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3008                         &data->args.seq_args,
3009                         &data->res.seq_res,
3010                         task);
3011 }
3012
3013 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3014                                  struct inode *new_dir)
3015 {
3016         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3017
3018         if (!nfs4_sequence_done(task, &res->seq_res))
3019                 return 0;
3020         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3021                 return 0;
3022
3023         update_changeattr(old_dir, &res->old_cinfo);
3024         update_changeattr(new_dir, &res->new_cinfo);
3025         return 1;
3026 }
3027
3028 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3029                 struct inode *new_dir, struct qstr *new_name)
3030 {
3031         struct nfs_server *server = NFS_SERVER(old_dir);
3032         struct nfs_renameargs arg = {
3033                 .old_dir = NFS_FH(old_dir),
3034                 .new_dir = NFS_FH(new_dir),
3035                 .old_name = old_name,
3036                 .new_name = new_name,
3037         };
3038         struct nfs_renameres res = {
3039                 .server = server,
3040         };
3041         struct rpc_message msg = {
3042                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3043                 .rpc_argp = &arg,
3044                 .rpc_resp = &res,
3045         };
3046         int status = -ENOMEM;
3047
3048         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3049         if (!status) {
3050                 update_changeattr(old_dir, &res.old_cinfo);
3051                 update_changeattr(new_dir, &res.new_cinfo);
3052         }
3053         return status;
3054 }
3055
3056 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3057                 struct inode *new_dir, struct qstr *new_name)
3058 {
3059         struct nfs4_exception exception = { };
3060         int err;
3061         do {
3062                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3063                                 _nfs4_proc_rename(old_dir, old_name,
3064                                         new_dir, new_name),
3065                                 &exception);
3066         } while (exception.retry);
3067         return err;
3068 }
3069
3070 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3071 {
3072         struct nfs_server *server = NFS_SERVER(inode);
3073         struct nfs4_link_arg arg = {
3074                 .fh     = NFS_FH(inode),
3075                 .dir_fh = NFS_FH(dir),
3076                 .name   = name,
3077                 .bitmask = server->attr_bitmask,
3078         };
3079         struct nfs4_link_res res = {
3080                 .server = server,
3081         };
3082         struct rpc_message msg = {
3083                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3084                 .rpc_argp = &arg,
3085                 .rpc_resp = &res,
3086         };
3087         int status = -ENOMEM;
3088
3089         res.fattr = nfs_alloc_fattr();
3090         if (res.fattr == NULL)
3091                 goto out;
3092
3093         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3094         if (!status) {
3095                 update_changeattr(dir, &res.cinfo);
3096                 nfs_post_op_update_inode(inode, res.fattr);
3097         }
3098 out:
3099         nfs_free_fattr(res.fattr);
3100         return status;
3101 }
3102
3103 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3104 {
3105         struct nfs4_exception exception = { };
3106         int err;
3107         do {
3108                 err = nfs4_handle_exception(NFS_SERVER(inode),
3109                                 _nfs4_proc_link(inode, dir, name),
3110                                 &exception);
3111         } while (exception.retry);
3112         return err;
3113 }
3114
3115 struct nfs4_createdata {
3116         struct rpc_message msg;
3117         struct nfs4_create_arg arg;
3118         struct nfs4_create_res res;
3119         struct nfs_fh fh;
3120         struct nfs_fattr fattr;
3121 };
3122
3123 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3124                 struct qstr *name, struct iattr *sattr, u32 ftype)
3125 {
3126         struct nfs4_createdata *data;
3127
3128         data = kzalloc(sizeof(*data), GFP_KERNEL);
3129         if (data != NULL) {
3130                 struct nfs_server *server = NFS_SERVER(dir);
3131
3132                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3133                 data->msg.rpc_argp = &data->arg;
3134                 data->msg.rpc_resp = &data->res;
3135                 data->arg.dir_fh = NFS_FH(dir);
3136                 data->arg.server = server;
3137                 data->arg.name = name;
3138                 data->arg.attrs = sattr;
3139                 data->arg.ftype = ftype;
3140                 data->arg.bitmask = server->attr_bitmask;
3141                 data->res.server = server;
3142                 data->res.fh = &data->fh;
3143                 data->res.fattr = &data->fattr;
3144                 nfs_fattr_init(data->res.fattr);
3145         }
3146         return data;
3147 }
3148
3149 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3150 {
3151         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3152                                     &data->arg.seq_args, &data->res.seq_res, 1);
3153         if (status == 0) {
3154                 update_changeattr(dir, &data->res.dir_cinfo);
3155                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3156         }
3157         return status;
3158 }
3159
3160 static void nfs4_free_createdata(struct nfs4_createdata *data)
3161 {
3162         kfree(data);
3163 }
3164
3165 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3166                 struct page *page, unsigned int len, struct iattr *sattr)
3167 {
3168         struct nfs4_createdata *data;
3169         int status = -ENAMETOOLONG;
3170
3171         if (len > NFS4_MAXPATHLEN)
3172                 goto out;
3173
3174         status = -ENOMEM;
3175         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3176         if (data == NULL)
3177                 goto out;
3178
3179         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3180         data->arg.u.symlink.pages = &page;
3181         data->arg.u.symlink.len = len;
3182
3183         status = nfs4_do_create(dir, dentry, data);
3184
3185         nfs4_free_createdata(data);
3186 out:
3187         return status;
3188 }
3189
3190 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3191                 struct page *page, unsigned int len, struct iattr *sattr)
3192 {
3193         struct nfs4_exception exception = { };
3194         int err;
3195         do {
3196                 err = nfs4_handle_exception(NFS_SERVER(dir),
3197                                 _nfs4_proc_symlink(dir, dentry, page,
3198                                                         len, sattr),
3199                                 &exception);
3200         } while (exception.retry);
3201         return err;
3202 }
3203
3204 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3205                 struct iattr *sattr)
3206 {
3207         struct nfs4_createdata *data;
3208         int status = -ENOMEM;
3209
3210         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3211         if (data == NULL)
3212                 goto out;
3213
3214         status = nfs4_do_create(dir, dentry, data);
3215
3216         nfs4_free_createdata(data);
3217 out:
3218         return status;
3219 }
3220
3221 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3222                 struct iattr *sattr)
3223 {
3224         struct nfs4_exception exception = { };
3225         int err;
3226
3227         sattr->ia_mode &= ~current_umask();
3228         do {
3229                 err = nfs4_handle_exception(NFS_SERVER(dir),
3230                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3231                                 &exception);
3232         } while (exception.retry);
3233         return err;
3234 }
3235
3236 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3237                 u64 cookie, struct page **pages, unsigned int count, int plus)
3238 {
3239         struct inode            *dir = dentry->d_inode;
3240         struct nfs4_readdir_arg args = {
3241                 .fh = NFS_FH(dir),
3242                 .pages = pages,
3243                 .pgbase = 0,
3244                 .count = count,
3245                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3246                 .plus = plus,
3247         };
3248         struct nfs4_readdir_res res;
3249         struct rpc_message msg = {
3250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3251                 .rpc_argp = &args,
3252                 .rpc_resp = &res,
3253                 .rpc_cred = cred,
3254         };
3255         int                     status;
3256
3257         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3258                         dentry->d_parent->d_name.name,
3259                         dentry->d_name.name,
3260                         (unsigned long long)cookie);
3261         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3262         res.pgbase = args.pgbase;
3263         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3264         if (status >= 0) {
3265                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3266                 status += args.pgbase;
3267         }
3268
3269         nfs_invalidate_atime(dir);
3270
3271         dprintk("%s: returns %d\n", __func__, status);
3272         return status;
3273 }
3274
3275 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3276                 u64 cookie, struct page **pages, unsigned int count, int plus)
3277 {
3278         struct nfs4_exception exception = { };
3279         int err;
3280         do {
3281                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3282                                 _nfs4_proc_readdir(dentry, cred, cookie,
3283                                         pages, count, plus),
3284                                 &exception);
3285         } while (exception.retry);
3286         return err;
3287 }
3288
3289 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3290                 struct iattr *sattr, dev_t rdev)
3291 {
3292         struct nfs4_createdata *data;
3293         int mode = sattr->ia_mode;
3294         int status = -ENOMEM;
3295
3296         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3297         if (data == NULL)
3298                 goto out;
3299
3300         if (S_ISFIFO(mode))
3301                 data->arg.ftype = NF4FIFO;
3302         else if (S_ISBLK(mode)) {
3303                 data->arg.ftype = NF4BLK;
3304                 data->arg.u.device.specdata1 = MAJOR(rdev);
3305                 data->arg.u.device.specdata2 = MINOR(rdev);
3306         }
3307         else if (S_ISCHR(mode)) {
3308                 data->arg.ftype = NF4CHR;
3309                 data->arg.u.device.specdata1 = MAJOR(rdev);
3310                 data->arg.u.device.specdata2 = MINOR(rdev);
3311         } else if (!S_ISSOCK(mode)) {
3312                 status = -EINVAL;
3313                 goto out_free;
3314         }
3315
3316         status = nfs4_do_create(dir, dentry, data);
3317 out_free:
3318         nfs4_free_createdata(data);
3319 out:
3320         return status;
3321 }
3322
3323 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3324                 struct iattr *sattr, dev_t rdev)
3325 {
3326         struct nfs4_exception exception = { };
3327         int err;
3328
3329         sattr->ia_mode &= ~current_umask();
3330         do {
3331                 err = nfs4_handle_exception(NFS_SERVER(dir),
3332                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3333                                 &exception);
3334         } while (exception.retry);
3335         return err;
3336 }
3337
3338 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3339                  struct nfs_fsstat *fsstat)
3340 {
3341         struct nfs4_statfs_arg args = {
3342                 .fh = fhandle,
3343                 .bitmask = server->attr_bitmask,
3344         };
3345         struct nfs4_statfs_res res = {
3346                 .fsstat = fsstat,
3347         };
3348         struct rpc_message msg = {
3349                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3350                 .rpc_argp = &args,
3351                 .rpc_resp = &res,
3352         };
3353
3354         nfs_fattr_init(fsstat->fattr);
3355         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3356 }
3357
3358 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3359 {
3360         struct nfs4_exception exception = { };
3361         int err;
3362         do {
3363                 err = nfs4_handle_exception(server,
3364                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3365                                 &exception);
3366         } while (exception.retry);
3367         return err;
3368 }
3369
3370 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3371                 struct nfs_fsinfo *fsinfo)
3372 {
3373         struct nfs4_fsinfo_arg args = {
3374                 .fh = fhandle,
3375                 .bitmask = server->attr_bitmask,
3376         };
3377         struct nfs4_fsinfo_res res = {
3378                 .fsinfo = fsinfo,
3379         };
3380         struct rpc_message msg = {
3381                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3382                 .rpc_argp = &args,
3383                 .rpc_resp = &res,
3384         };
3385
3386         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3387 }
3388
3389 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3390 {
3391         struct nfs4_exception exception = { };
3392         int err;
3393
3394         do {
3395                 err = nfs4_handle_exception(server,
3396                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3397                                 &exception);
3398         } while (exception.retry);
3399         return err;
3400 }
3401
3402 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3403 {
3404         int error;
3405
3406         nfs_fattr_init(fsinfo->fattr);
3407         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3408         if (error == 0) {
3409                 /* block layout checks this! */
3410                 server->pnfs_blksize = fsinfo->blksize;
3411                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3412         }
3413
3414         return error;
3415 }
3416
3417 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3418                 struct nfs_pathconf *pathconf)
3419 {
3420         struct nfs4_pathconf_arg args = {
3421                 .fh = fhandle,
3422                 .bitmask = server->attr_bitmask,
3423         };
3424         struct nfs4_pathconf_res res = {
3425                 .pathconf = pathconf,
3426         };
3427         struct rpc_message msg = {
3428                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3429                 .rpc_argp = &args,
3430                 .rpc_resp = &res,
3431         };
3432
3433         /* None of the pathconf attributes are mandatory to implement */
3434         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3435                 memset(pathconf, 0, sizeof(*pathconf));
3436                 return 0;
3437         }
3438
3439         nfs_fattr_init(pathconf->fattr);
3440         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3441 }
3442
3443 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3444                 struct nfs_pathconf *pathconf)
3445 {
3446         struct nfs4_exception exception = { };
3447         int err;
3448
3449         do {
3450                 err = nfs4_handle_exception(server,
3451                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3452                                 &exception);
3453         } while (exception.retry);
3454         return err;
3455 }
3456
3457 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3458                 const struct nfs_open_context *ctx,
3459                 const struct nfs_lock_context *l_ctx,
3460                 fmode_t fmode)
3461 {
3462         const struct nfs_lockowner *lockowner = NULL;
3463
3464         if (l_ctx != NULL)
3465                 lockowner = &l_ctx->lockowner;
3466         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3467 }
3468 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3469
3470 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3471                 const struct nfs_open_context *ctx,
3472                 const struct nfs_lock_context *l_ctx,
3473                 fmode_t fmode)
3474 {
3475         nfs4_stateid current_stateid;
3476
3477         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3478                 return false;
3479         return nfs4_stateid_match(stateid, &current_stateid);
3480 }
3481
3482 static bool nfs4_error_stateid_expired(int err)
3483 {
3484         switch (err) {
3485         case -NFS4ERR_DELEG_REVOKED:
3486         case -NFS4ERR_ADMIN_REVOKED:
3487         case -NFS4ERR_BAD_STATEID:
3488         case -NFS4ERR_STALE_STATEID:
3489         case -NFS4ERR_OLD_STATEID:
3490         case -NFS4ERR_OPENMODE:
3491         case -NFS4ERR_EXPIRED:
3492                 return true;
3493         }
3494         return false;
3495 }
3496
3497 void __nfs4_read_done_cb(struct nfs_read_data *data)
3498 {
3499         nfs_invalidate_atime(data->header->inode);
3500 }
3501
3502 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3503 {
3504         struct nfs_server *server = NFS_SERVER(data->header->inode);
3505
3506         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3507                 rpc_restart_call_prepare(task);
3508                 return -EAGAIN;
3509         }
3510
3511         __nfs4_read_done_cb(data);
3512         if (task->tk_status > 0)
3513                 renew_lease(server, data->timestamp);
3514         return 0;
3515 }
3516
3517 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3518                 struct nfs_readargs *args)
3519 {
3520
3521         if (!nfs4_error_stateid_expired(task->tk_status) ||
3522                 nfs4_stateid_is_current(&args->stateid,
3523                                 args->context,
3524                                 args->lock_context,
3525                                 FMODE_READ))
3526                 return false;
3527         rpc_restart_call_prepare(task);
3528         return true;
3529 }
3530
3531 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3532 {
3533
3534         dprintk("--> %s\n", __func__);
3535
3536         if (!nfs4_sequence_done(task, &data->res.seq_res))
3537                 return -EAGAIN;
3538         if (nfs4_read_stateid_changed(task, &data->args))
3539                 return -EAGAIN;
3540         return data->read_done_cb ? data->read_done_cb(task, data) :
3541                                     nfs4_read_done_cb(task, data);
3542 }
3543
3544 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3545 {
3546         data->timestamp   = jiffies;
3547         data->read_done_cb = nfs4_read_done_cb;
3548         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3549         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3550 }
3551
3552 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3553 {
3554         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3555                         &data->args.seq_args,
3556                         &data->res.seq_res,
3557                         task))
3558                 return;
3559         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3560                         data->args.lock_context, FMODE_READ);
3561 }
3562
3563 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3564 {
3565         struct inode *inode = data->header->inode;
3566
3567         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3568                 rpc_restart_call_prepare(task);
3569                 return -EAGAIN;
3570         }
3571         if (task->tk_status >= 0) {
3572                 renew_lease(NFS_SERVER(inode), data->timestamp);
3573                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3574         }
3575         return 0;
3576 }
3577
3578 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3579                 struct nfs_writeargs *args)
3580 {
3581
3582         if (!nfs4_error_stateid_expired(task->tk_status) ||
3583                 nfs4_stateid_is_current(&args->stateid,
3584                                 args->context,
3585                                 args->lock_context,
3586                                 FMODE_WRITE))
3587                 return false;
3588         rpc_restart_call_prepare(task);
3589         return true;
3590 }
3591
3592 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3593 {
3594         if (!nfs4_sequence_done(task, &data->res.seq_res))
3595                 return -EAGAIN;
3596         if (nfs4_write_stateid_changed(task, &data->args))
3597                 return -EAGAIN;
3598         return data->write_done_cb ? data->write_done_cb(task, data) :
3599                 nfs4_write_done_cb(task, data);
3600 }
3601
3602 static
3603 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3604 {
3605         const struct nfs_pgio_header *hdr = data->header;
3606
3607         /* Don't request attributes for pNFS or O_DIRECT writes */
3608         if (data->ds_clp != NULL || hdr->dreq != NULL)
3609                 return false;
3610         /* Otherwise, request attributes if and only if we don't hold
3611          * a delegation
3612          */
3613         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3614 }
3615
3616 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3617 {
3618         struct nfs_server *server = NFS_SERVER(data->header->inode);
3619
3620         if (!nfs4_write_need_cache_consistency_data(data)) {
3621                 data->args.bitmask = NULL;
3622                 data->res.fattr = NULL;
3623         } else
3624                 data->args.bitmask = server->cache_consistency_bitmask;
3625
3626         if (!data->write_done_cb)
3627                 data->write_done_cb = nfs4_write_done_cb;
3628         data->res.server = server;
3629         data->timestamp   = jiffies;
3630
3631         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3632         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3633 }
3634
3635 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3636 {
3637         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3638                         &data->args.seq_args,
3639                         &data->res.seq_res,
3640                         task))
3641                 return;
3642         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3643                         data->args.lock_context, FMODE_WRITE);
3644 }
3645
3646 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3647 {
3648         nfs4_setup_sequence(NFS_SERVER(data->inode),
3649                         &data->args.seq_args,
3650                         &data->res.seq_res,
3651                         task);
3652 }
3653
3654 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3655 {
3656         struct inode *inode = data->inode;
3657
3658         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3659                 rpc_restart_call_prepare(task);
3660                 return -EAGAIN;
3661         }
3662         return 0;
3663 }
3664
3665 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3666 {
3667         if (!nfs4_sequence_done(task, &data->res.seq_res))
3668                 return -EAGAIN;
3669         return data->commit_done_cb(task, data);
3670 }
3671
3672 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3673 {
3674         struct nfs_server *server = NFS_SERVER(data->inode);
3675
3676         if (data->commit_done_cb == NULL)
3677                 data->commit_done_cb = nfs4_commit_done_cb;
3678         data->res.server = server;
3679         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3680         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3681 }
3682
3683 struct nfs4_renewdata {
3684         struct nfs_client       *client;
3685         unsigned long           timestamp;
3686 };
3687
3688 /*
3689  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3690  * standalone procedure for queueing an asynchronous RENEW.
3691  */
3692 static void nfs4_renew_release(void *calldata)
3693 {
3694         struct nfs4_renewdata *data = calldata;
3695         struct nfs_client *clp = data->client;
3696
3697         if (atomic_read(&clp->cl_count) > 1)
3698                 nfs4_schedule_state_renewal(clp);
3699         nfs_put_client(clp);
3700         kfree(data);
3701 }
3702
3703 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3704 {
3705         struct nfs4_renewdata *data = calldata;
3706         struct nfs_client *clp = data->client;
3707         unsigned long timestamp = data->timestamp;
3708
3709         if (task->tk_status < 0) {
3710                 /* Unless we're shutting down, schedule state recovery! */
3711                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3712                         return;
3713                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3714                         nfs4_schedule_lease_recovery(clp);
3715                         return;
3716                 }
3717                 nfs4_schedule_path_down_recovery(clp);
3718         }
3719         do_renew_lease(clp, timestamp);
3720 }
3721
3722 static const struct rpc_call_ops nfs4_renew_ops = {
3723         .rpc_call_done = nfs4_renew_done,
3724         .rpc_release = nfs4_renew_release,
3725 };
3726
3727 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3728 {
3729         struct rpc_message msg = {
3730                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3731                 .rpc_argp       = clp,
3732                 .rpc_cred       = cred,
3733         };
3734         struct nfs4_renewdata *data;
3735
3736         if (renew_flags == 0)
3737                 return 0;
3738         if (!atomic_inc_not_zero(&clp->cl_count))
3739                 return -EIO;
3740         data = kmalloc(sizeof(*data), GFP_NOFS);
3741         if (data == NULL)
3742                 return -ENOMEM;
3743         data->client = clp;
3744         data->timestamp = jiffies;
3745         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3746                         &nfs4_renew_ops, data);
3747 }
3748
3749 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3750 {
3751         struct rpc_message msg = {
3752                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3753                 .rpc_argp       = clp,
3754                 .rpc_cred       = cred,
3755         };
3756         unsigned long now = jiffies;
3757         int status;
3758
3759         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3760         if (status < 0)
3761                 return status;
3762         do_renew_lease(clp, now);
3763         return 0;
3764 }
3765
3766 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3767 {
3768         return (server->caps & NFS_CAP_ACLS)
3769                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3770                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3771 }
3772
3773 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3774  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3775  * the stack.
3776  */
3777 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3778
3779 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3780                 struct page **pages, unsigned int *pgbase)
3781 {
3782         struct page *newpage, **spages;
3783         int rc = 0;
3784         size_t len;
3785         spages = pages;
3786
3787         do {
3788                 len = min_t(size_t, PAGE_SIZE, buflen);
3789                 newpage = alloc_page(GFP_KERNEL);
3790
3791                 if (newpage == NULL)
3792                         goto unwind;
3793                 memcpy(page_address(newpage), buf, len);
3794                 buf += len;
3795                 buflen -= len;
3796                 *pages++ = newpage;
3797                 rc++;
3798         } while (buflen != 0);
3799
3800         return rc;
3801
3802 unwind:
3803         for(; rc > 0; rc--)
3804                 __free_page(spages[rc-1]);
3805         return -ENOMEM;
3806 }
3807
3808 struct nfs4_cached_acl {
3809         int cached;
3810         size_t len;
3811         char data[0];
3812 };
3813
3814 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3815 {
3816         struct nfs_inode *nfsi = NFS_I(inode);
3817
3818         spin_lock(&inode->i_lock);
3819         kfree(nfsi->nfs4_acl);
3820         nfsi->nfs4_acl = acl;
3821         spin_unlock(&inode->i_lock);
3822 }
3823
3824 static void nfs4_zap_acl_attr(struct inode *inode)
3825 {
3826         nfs4_set_cached_acl(inode, NULL);
3827 }
3828
3829 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3830 {
3831         struct nfs_inode *nfsi = NFS_I(inode);
3832         struct nfs4_cached_acl *acl;
3833         int ret = -ENOENT;
3834
3835         spin_lock(&inode->i_lock);
3836         acl = nfsi->nfs4_acl;
3837         if (acl == NULL)
3838                 goto out;
3839         if (buf == NULL) /* user is just asking for length */
3840                 goto out_len;
3841         if (acl->cached == 0)
3842                 goto out;
3843         ret = -ERANGE; /* see getxattr(2) man page */
3844         if (acl->len > buflen)
3845                 goto out;
3846         memcpy(buf, acl->data, acl->len);
3847 out_len:
3848         ret = acl->len;
3849 out:
3850         spin_unlock(&inode->i_lock);
3851         return ret;
3852 }
3853
3854 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3855 {
3856         struct nfs4_cached_acl *acl;
3857         size_t buflen = sizeof(*acl) + acl_len;
3858
3859         if (buflen <= PAGE_SIZE) {
3860                 acl = kmalloc(buflen, GFP_KERNEL);
3861                 if (acl == NULL)
3862                         goto out;
3863                 acl->cached = 1;
3864                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3865         } else {
3866                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3867                 if (acl == NULL)
3868                         goto out;
3869                 acl->cached = 0;
3870         }
3871         acl->len = acl_len;
3872 out:
3873         nfs4_set_cached_acl(inode, acl);
3874 }
3875
3876 /*
3877  * The getxattr API returns the required buffer length when called with a
3878  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3879  * the required buf.  On a NULL buf, we send a page of data to the server
3880  * guessing that the ACL request can be serviced by a page. If so, we cache
3881  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3882  * the cache. If not so, we throw away the page, and cache the required
3883  * length. The next getxattr call will then produce another round trip to
3884  * the server, this time with the input buf of the required size.
3885  */
3886 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3887 {
3888         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3889         struct nfs_getaclargs args = {
3890                 .fh = NFS_FH(inode),
3891                 .acl_pages = pages,
3892                 .acl_len = buflen,
3893         };
3894         struct nfs_getaclres res = {
3895                 .acl_len = buflen,
3896         };
3897         struct rpc_message msg = {
3898                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3899                 .rpc_argp = &args,
3900                 .rpc_resp = &res,
3901         };
3902         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3903         int ret = -ENOMEM, i;
3904
3905         /* As long as we're doing a round trip to the server anyway,
3906          * let's be prepared for a page of acl data. */
3907         if (npages == 0)
3908                 npages = 1;
3909         if (npages > ARRAY_SIZE(pages))
3910                 return -ERANGE;
3911
3912         for (i = 0; i < npages; i++) {
3913                 pages[i] = alloc_page(GFP_KERNEL);
3914                 if (!pages[i])
3915                         goto out_free;
3916         }
3917
3918         /* for decoding across pages */
3919         res.acl_scratch = alloc_page(GFP_KERNEL);
3920         if (!res.acl_scratch)
3921                 goto out_free;
3922
3923         args.acl_len = npages * PAGE_SIZE;
3924         args.acl_pgbase = 0;
3925
3926         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3927                 __func__, buf, buflen, npages, args.acl_len);
3928         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3929                              &msg, &args.seq_args, &res.seq_res, 0);
3930         if (ret)
3931                 goto out_free;
3932
3933         /* Handle the case where the passed-in buffer is too short */
3934         if (res.acl_flags & NFS4_ACL_TRUNC) {
3935                 /* Did the user only issue a request for the acl length? */
3936                 if (buf == NULL)
3937                         goto out_ok;
3938                 ret = -ERANGE;
3939                 goto out_free;
3940         }
3941         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3942         if (buf) {
3943                 if (res.acl_len > buflen) {
3944                         ret = -ERANGE;
3945                         goto out_free;
3946                 }
3947                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3948         }
3949 out_ok:
3950         ret = res.acl_len;
3951 out_free:
3952         for (i = 0; i < npages; i++)
3953                 if (pages[i])
3954                         __free_page(pages[i]);
3955         if (res.acl_scratch)
3956                 __free_page(res.acl_scratch);
3957         return ret;
3958 }
3959
3960 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3961 {
3962         struct nfs4_exception exception = { };
3963         ssize_t ret;
3964         do {
3965                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3966                 if (ret >= 0)
3967                         break;
3968                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3969         } while (exception.retry);
3970         return ret;
3971 }
3972
3973 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3974 {
3975         struct nfs_server *server = NFS_SERVER(inode);
3976         int ret;
3977
3978         if (!nfs4_server_supports_acls(server))
3979                 return -EOPNOTSUPP;
3980         ret = nfs_revalidate_inode(server, inode);
3981         if (ret < 0)
3982                 return ret;
3983         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3984                 nfs_zap_acl_cache(inode);
3985         ret = nfs4_read_cached_acl(inode, buf, buflen);
3986         if (ret != -ENOENT)
3987                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3988                  * but no cached acl data, just the acl length */
3989                 return ret;
3990         return nfs4_get_acl_uncached(inode, buf, buflen);
3991 }
3992
3993 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3994 {
3995         struct nfs_server *server = NFS_SERVER(inode);
3996         struct page *pages[NFS4ACL_MAXPAGES];
3997         struct nfs_setaclargs arg = {
3998                 .fh             = NFS_FH(inode),
3999                 .acl_pages      = pages,
4000                 .acl_len        = buflen,
4001         };
4002         struct nfs_setaclres res;
4003         struct rpc_message msg = {
4004                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4005                 .rpc_argp       = &arg,
4006                 .rpc_resp       = &res,
4007         };
4008         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4009         int ret, i;
4010
4011         if (!nfs4_server_supports_acls(server))
4012                 return -EOPNOTSUPP;
4013         if (npages > ARRAY_SIZE(pages))
4014                 return -ERANGE;
4015         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4016         if (i < 0)
4017                 return i;
4018         nfs4_inode_return_delegation(inode);
4019         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4020
4021         /*
4022          * Free each page after tx, so the only ref left is
4023          * held by the network stack
4024          */
4025         for (; i > 0; i--)
4026                 put_page(pages[i-1]);
4027
4028         /*
4029          * Acl update can result in inode attribute update.
4030          * so mark the attribute cache invalid.
4031          */
4032         spin_lock(&inode->i_lock);
4033         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4034         spin_unlock(&inode->i_lock);
4035         nfs_access_zap_cache(inode);
4036         nfs_zap_acl_cache(inode);
4037         return ret;
4038 }
4039
4040 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4041 {
4042         struct nfs4_exception exception = { };
4043         int err;
4044         do {
4045                 err = nfs4_handle_exception(NFS_SERVER(inode),
4046                                 __nfs4_proc_set_acl(inode, buf, buflen),
4047                                 &exception);
4048         } while (exception.retry);
4049         return err;
4050 }
4051
4052 static int
4053 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4054 {
4055         struct nfs_client *clp = server->nfs_client;
4056
4057         if (task->tk_status >= 0)
4058                 return 0;
4059         switch(task->tk_status) {
4060                 case -NFS4ERR_DELEG_REVOKED:
4061                 case -NFS4ERR_ADMIN_REVOKED:
4062                 case -NFS4ERR_BAD_STATEID:
4063                         if (state == NULL)
4064                                 break;
4065                         nfs_remove_bad_delegation(state->inode);
4066                 case -NFS4ERR_OPENMODE:
4067                         if (state == NULL)
4068                                 break;
4069                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4070                                 goto stateid_invalid;
4071                         goto wait_on_recovery;
4072                 case -NFS4ERR_EXPIRED:
4073                         if (state != NULL) {
4074                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4075                                         goto stateid_invalid;
4076                         }
4077                 case -NFS4ERR_STALE_STATEID:
4078                 case -NFS4ERR_STALE_CLIENTID:
4079                         nfs4_schedule_lease_recovery(clp);
4080                         goto wait_on_recovery;
4081 #if defined(CONFIG_NFS_V4_1)
4082                 case -NFS4ERR_BADSESSION:
4083                 case -NFS4ERR_BADSLOT:
4084                 case -NFS4ERR_BAD_HIGH_SLOT:
4085                 case -NFS4ERR_DEADSESSION:
4086                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4087                 case -NFS4ERR_SEQ_FALSE_RETRY:
4088                 case -NFS4ERR_SEQ_MISORDERED:
4089                         dprintk("%s ERROR %d, Reset session\n", __func__,
4090                                 task->tk_status);
4091                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4092                         task->tk_status = 0;
4093                         return -EAGAIN;
4094 #endif /* CONFIG_NFS_V4_1 */
4095                 case -NFS4ERR_DELAY:
4096                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4097                 case -NFS4ERR_GRACE:
4098                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4099                         task->tk_status = 0;
4100                         return -EAGAIN;
4101                 case -NFS4ERR_RETRY_UNCACHED_REP:
4102                 case -NFS4ERR_OLD_STATEID:
4103                         task->tk_status = 0;
4104                         return -EAGAIN;
4105         }
4106         task->tk_status = nfs4_map_errors(task->tk_status);
4107         return 0;
4108 stateid_invalid:
4109         task->tk_status = -EIO;
4110         return 0;
4111 wait_on_recovery:
4112         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4113         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4114                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4115         task->tk_status = 0;
4116         return -EAGAIN;
4117 }
4118
4119 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4120                                     nfs4_verifier *bootverf)
4121 {
4122         __be32 verf[2];
4123
4124         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4125                 /* An impossible timestamp guarantees this value
4126                  * will never match a generated boot time. */
4127                 verf[0] = 0;
4128                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4129         } else {
4130                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4131                 verf[0] = (__be32)nn->boot_time.tv_sec;
4132                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4133         }
4134         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4135 }
4136
4137 static unsigned int
4138 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4139                                    char *buf, size_t len)
4140 {
4141         unsigned int result;
4142
4143         rcu_read_lock();
4144         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4145                                 clp->cl_ipaddr,
4146                                 rpc_peeraddr2str(clp->cl_rpcclient,
4147                                                         RPC_DISPLAY_ADDR),
4148                                 rpc_peeraddr2str(clp->cl_rpcclient,
4149                                                         RPC_DISPLAY_PROTO));
4150         rcu_read_unlock();
4151         return result;
4152 }
4153
4154 static unsigned int
4155 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4156                                 char *buf, size_t len)
4157 {
4158         char *nodename = clp->cl_rpcclient->cl_nodename;
4159
4160         if (nfs4_client_id_uniquifier[0] != '\0')
4161                 nodename = nfs4_client_id_uniquifier;
4162         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4163                                 clp->rpc_ops->version, clp->cl_minorversion,
4164                                 nodename);
4165 }
4166
4167 /**
4168  * nfs4_proc_setclientid - Negotiate client ID
4169  * @clp: state data structure
4170  * @program: RPC program for NFSv4 callback service
4171  * @port: IP port number for NFS4 callback service
4172  * @cred: RPC credential to use for this call
4173  * @res: where to place the result
4174  *
4175  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4176  */
4177 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4178                 unsigned short port, struct rpc_cred *cred,
4179                 struct nfs4_setclientid_res *res)
4180 {
4181         nfs4_verifier sc_verifier;
4182         struct nfs4_setclientid setclientid = {
4183                 .sc_verifier = &sc_verifier,
4184                 .sc_prog = program,
4185                 .sc_cb_ident = clp->cl_cb_ident,
4186         };
4187         struct rpc_message msg = {
4188                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4189                 .rpc_argp = &setclientid,
4190                 .rpc_resp = res,
4191                 .rpc_cred = cred,
4192         };
4193         int status;
4194
4195         /* nfs_client_id4 */
4196         nfs4_init_boot_verifier(clp, &sc_verifier);
4197         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4198                 setclientid.sc_name_len =
4199                                 nfs4_init_uniform_client_string(clp,
4200                                                 setclientid.sc_name,
4201                                                 sizeof(setclientid.sc_name));
4202         else
4203                 setclientid.sc_name_len =
4204                                 nfs4_init_nonuniform_client_string(clp,
4205                                                 setclientid.sc_name,
4206                                                 sizeof(setclientid.sc_name));
4207         /* cb_client4 */
4208         rcu_read_lock();
4209         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4210                                 sizeof(setclientid.sc_netid),
4211                                 rpc_peeraddr2str(clp->cl_rpcclient,
4212                                                         RPC_DISPLAY_NETID));
4213         rcu_read_unlock();
4214         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4215                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4216                                 clp->cl_ipaddr, port >> 8, port & 255);
4217
4218         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4219                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4220                 setclientid.sc_name_len, setclientid.sc_name);
4221         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4222         dprintk("NFS reply setclientid: %d\n", status);
4223         return status;
4224 }
4225
4226 /**
4227  * nfs4_proc_setclientid_confirm - Confirm client ID
4228  * @clp: state data structure
4229  * @res: result of a previous SETCLIENTID
4230  * @cred: RPC credential to use for this call
4231  *
4232  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4233  */
4234 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4235                 struct nfs4_setclientid_res *arg,
4236                 struct rpc_cred *cred)
4237 {
4238         struct nfs_fsinfo fsinfo;
4239         struct rpc_message msg = {
4240                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4241                 .rpc_argp = arg,
4242                 .rpc_resp = &fsinfo,
4243                 .rpc_cred = cred,
4244         };
4245         unsigned long now;
4246         int status;
4247
4248         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4249                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4250                 clp->cl_clientid);
4251         now = jiffies;
4252         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4253         if (status == 0) {
4254                 spin_lock(&clp->cl_lock);
4255                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4256                 clp->cl_last_renewal = now;
4257                 spin_unlock(&clp->cl_lock);
4258         }
4259         dprintk("NFS reply setclientid_confirm: %d\n", status);
4260         return status;
4261 }
4262
4263 struct nfs4_delegreturndata {
4264         struct nfs4_delegreturnargs args;
4265         struct nfs4_delegreturnres res;
4266         struct nfs_fh fh;
4267         nfs4_stateid stateid;
4268         unsigned long timestamp;
4269         struct nfs_fattr fattr;
4270         int rpc_status;
4271 };
4272
4273 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4274 {
4275         struct nfs4_delegreturndata *data = calldata;
4276
4277         if (!nfs4_sequence_done(task, &data->res.seq_res))
4278                 return;
4279
4280         switch (task->tk_status) {
4281         case -NFS4ERR_STALE_STATEID:
4282         case -NFS4ERR_EXPIRED:
4283         case 0:
4284                 renew_lease(data->res.server, data->timestamp);
4285                 break;
4286         default:
4287                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4288                                 -EAGAIN) {
4289                         rpc_restart_call_prepare(task);
4290                         return;
4291                 }
4292         }
4293         data->rpc_status = task->tk_status;
4294 }
4295
4296 static void nfs4_delegreturn_release(void *calldata)
4297 {
4298         kfree(calldata);
4299 }
4300
4301 #if defined(CONFIG_NFS_V4_1)
4302 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4303 {
4304         struct nfs4_delegreturndata *d_data;
4305
4306         d_data = (struct nfs4_delegreturndata *)data;
4307
4308         nfs4_setup_sequence(d_data->res.server,
4309                         &d_data->args.seq_args,
4310                         &d_data->res.seq_res,
4311                         task);
4312 }
4313 #endif /* CONFIG_NFS_V4_1 */
4314
4315 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4316 #if defined(CONFIG_NFS_V4_1)
4317         .rpc_call_prepare = nfs4_delegreturn_prepare,
4318 #endif /* CONFIG_NFS_V4_1 */
4319         .rpc_call_done = nfs4_delegreturn_done,
4320         .rpc_release = nfs4_delegreturn_release,
4321 };
4322
4323 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4324 {
4325         struct nfs4_delegreturndata *data;
4326         struct nfs_server *server = NFS_SERVER(inode);
4327         struct rpc_task *task;
4328         struct rpc_message msg = {
4329                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4330                 .rpc_cred = cred,
4331         };
4332         struct rpc_task_setup task_setup_data = {
4333                 .rpc_client = server->client,
4334                 .rpc_message = &msg,
4335                 .callback_ops = &nfs4_delegreturn_ops,
4336                 .flags = RPC_TASK_ASYNC,
4337         };
4338         int status = 0;
4339
4340         data = kzalloc(sizeof(*data), GFP_NOFS);
4341         if (data == NULL)
4342                 return -ENOMEM;
4343         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4344         data->args.fhandle = &data->fh;
4345         data->args.stateid = &data->stateid;
4346         data->args.bitmask = server->cache_consistency_bitmask;
4347         nfs_copy_fh(&data->fh, NFS_FH(inode));
4348         nfs4_stateid_copy(&data->stateid, stateid);
4349         data->res.fattr = &data->fattr;
4350         data->res.server = server;
4351         nfs_fattr_init(data->res.fattr);
4352         data->timestamp = jiffies;
4353         data->rpc_status = 0;
4354
4355         task_setup_data.callback_data = data;
4356         msg.rpc_argp = &data->args;
4357         msg.rpc_resp = &data->res;
4358         task = rpc_run_task(&task_setup_data);
4359         if (IS_ERR(task))
4360                 return PTR_ERR(task);
4361         if (!issync)
4362                 goto out;
4363         status = nfs4_wait_for_completion_rpc_task(task);
4364         if (status != 0)
4365                 goto out;
4366         status = data->rpc_status;
4367         if (status == 0)
4368                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4369         else
4370                 nfs_refresh_inode(inode, &data->fattr);
4371 out:
4372         rpc_put_task(task);
4373         return status;
4374 }
4375
4376 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4377 {
4378         struct nfs_server *server = NFS_SERVER(inode);
4379         struct nfs4_exception exception = { };
4380         int err;
4381         do {
4382                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4383                 switch (err) {
4384                         case -NFS4ERR_STALE_STATEID:
4385                         case -NFS4ERR_EXPIRED:
4386                         case 0:
4387                                 return 0;
4388                 }
4389                 err = nfs4_handle_exception(server, err, &exception);
4390         } while (exception.retry);
4391         return err;
4392 }
4393
4394 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4395 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4396
4397 /*
4398  * sleep, with exponential backoff, and retry the LOCK operation.
4399  */
4400 static unsigned long
4401 nfs4_set_lock_task_retry(unsigned long timeout)
4402 {
4403         freezable_schedule_timeout_killable(timeout);
4404         timeout <<= 1;
4405         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4406                 return NFS4_LOCK_MAXTIMEOUT;
4407         return timeout;
4408 }
4409
4410 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4411 {
4412         struct inode *inode = state->inode;
4413         struct nfs_server *server = NFS_SERVER(inode);
4414         struct nfs_client *clp = server->nfs_client;
4415         struct nfs_lockt_args arg = {
4416                 .fh = NFS_FH(inode),
4417                 .fl = request,
4418         };
4419         struct nfs_lockt_res res = {
4420                 .denied = request,
4421         };
4422         struct rpc_message msg = {
4423                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4424                 .rpc_argp       = &arg,
4425                 .rpc_resp       = &res,
4426                 .rpc_cred       = state->owner->so_cred,
4427         };
4428         struct nfs4_lock_state *lsp;
4429         int status;
4430
4431         arg.lock_owner.clientid = clp->cl_clientid;
4432         status = nfs4_set_lock_state(state, request);
4433         if (status != 0)
4434                 goto out;
4435         lsp = request->fl_u.nfs4_fl.owner;
4436         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4437         arg.lock_owner.s_dev = server->s_dev;
4438         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4439         switch (status) {
4440                 case 0:
4441                         request->fl_type = F_UNLCK;
4442                         break;
4443                 case -NFS4ERR_DENIED:
4444                         status = 0;
4445         }
4446         request->fl_ops->fl_release_private(request);
4447 out:
4448         return status;
4449 }
4450
4451 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4452 {
4453         struct nfs4_exception exception = { };
4454         int err;
4455
4456         do {
4457                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4458                                 _nfs4_proc_getlk(state, cmd, request),
4459                                 &exception);
4460         } while (exception.retry);
4461         return err;
4462 }
4463
4464 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4465 {
4466         int res = 0;
4467         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4468                 case FL_POSIX:
4469                         res = posix_lock_file_wait(file, fl);
4470                         break;
4471                 case FL_FLOCK:
4472                         res = flock_lock_file_wait(file, fl);
4473                         break;
4474                 default:
4475                         BUG();
4476         }
4477         return res;
4478 }
4479
4480 struct nfs4_unlockdata {
4481         struct nfs_locku_args arg;
4482         struct nfs_locku_res res;
4483         struct nfs4_lock_state *lsp;
4484         struct nfs_open_context *ctx;
4485         struct file_lock fl;
4486         const struct nfs_server *server;
4487         unsigned long timestamp;
4488 };
4489
4490 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4491                 struct nfs_open_context *ctx,
4492                 struct nfs4_lock_state *lsp,
4493                 struct nfs_seqid *seqid)
4494 {
4495         struct nfs4_unlockdata *p;
4496         struct inode *inode = lsp->ls_state->inode;
4497
4498         p = kzalloc(sizeof(*p), GFP_NOFS);
4499         if (p == NULL)
4500                 return NULL;
4501         p->arg.fh = NFS_FH(inode);
4502         p->arg.fl = &p->fl;
4503         p->arg.seqid = seqid;
4504         p->res.seqid = seqid;
4505         p->arg.stateid = &lsp->ls_stateid;
4506         p->lsp = lsp;
4507         atomic_inc(&lsp->ls_count);
4508         /* Ensure we don't close file until we're done freeing locks! */
4509         p->ctx = get_nfs_open_context(ctx);
4510         memcpy(&p->fl, fl, sizeof(p->fl));
4511         p->server = NFS_SERVER(inode);
4512         return p;
4513 }
4514
4515 static void nfs4_locku_release_calldata(void *data)
4516 {
4517         struct nfs4_unlockdata *calldata = data;
4518         nfs_free_seqid(calldata->arg.seqid);
4519         nfs4_put_lock_state(calldata->lsp);
4520         put_nfs_open_context(calldata->ctx);
4521         kfree(calldata);
4522 }
4523
4524 static void nfs4_locku_done(struct rpc_task *task, void *data)
4525 {
4526         struct nfs4_unlockdata *calldata = data;
4527
4528         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4529                 return;
4530         switch (task->tk_status) {
4531                 case 0:
4532                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4533                                         &calldata->res.stateid);
4534                         renew_lease(calldata->server, calldata->timestamp);
4535                         break;
4536                 case -NFS4ERR_BAD_STATEID:
4537                 case -NFS4ERR_OLD_STATEID:
4538                 case -NFS4ERR_STALE_STATEID:
4539                 case -NFS4ERR_EXPIRED:
4540                         break;
4541                 default:
4542                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4543                                 rpc_restart_call_prepare(task);
4544         }
4545         nfs_release_seqid(calldata->arg.seqid);
4546 }
4547
4548 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4549 {
4550         struct nfs4_unlockdata *calldata = data;
4551
4552         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4553                 goto out_wait;
4554         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4555                 /* Note: exit _without_ running nfs4_locku_done */
4556                 goto out_no_action;
4557         }
4558         calldata->timestamp = jiffies;
4559         if (nfs4_setup_sequence(calldata->server,
4560                                 &calldata->arg.seq_args,
4561                                 &calldata->res.seq_res,
4562                                 task) != 0)
4563                 nfs_release_seqid(calldata->arg.seqid);
4564         return;
4565 out_no_action:
4566         task->tk_action = NULL;
4567 out_wait:
4568         nfs4_sequence_done(task, &calldata->res.seq_res);
4569 }
4570
4571 static const struct rpc_call_ops nfs4_locku_ops = {
4572         .rpc_call_prepare = nfs4_locku_prepare,
4573         .rpc_call_done = nfs4_locku_done,
4574         .rpc_release = nfs4_locku_release_calldata,
4575 };
4576
4577 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4578                 struct nfs_open_context *ctx,
4579                 struct nfs4_lock_state *lsp,
4580                 struct nfs_seqid *seqid)
4581 {
4582         struct nfs4_unlockdata *data;
4583         struct rpc_message msg = {
4584                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4585                 .rpc_cred = ctx->cred,
4586         };
4587         struct rpc_task_setup task_setup_data = {
4588                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4589                 .rpc_message = &msg,
4590                 .callback_ops = &nfs4_locku_ops,
4591                 .workqueue = nfsiod_workqueue,
4592                 .flags = RPC_TASK_ASYNC,
4593         };
4594
4595         /* Ensure this is an unlock - when canceling a lock, the
4596          * canceled lock is passed in, and it won't be an unlock.
4597          */
4598         fl->fl_type = F_UNLCK;
4599
4600         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4601         if (data == NULL) {
4602                 nfs_free_seqid(seqid);
4603                 return ERR_PTR(-ENOMEM);
4604         }
4605
4606         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4607         msg.rpc_argp = &data->arg;
4608         msg.rpc_resp = &data->res;
4609         task_setup_data.callback_data = data;
4610         return rpc_run_task(&task_setup_data);
4611 }
4612
4613 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4614 {
4615         struct inode *inode = state->inode;
4616         struct nfs4_state_owner *sp = state->owner;
4617         struct nfs_inode *nfsi = NFS_I(inode);
4618         struct nfs_seqid *seqid;
4619         struct nfs4_lock_state *lsp;
4620         struct rpc_task *task;
4621         int status = 0;
4622         unsigned char fl_flags = request->fl_flags;
4623
4624         status = nfs4_set_lock_state(state, request);
4625         /* Unlock _before_ we do the RPC call */
4626         request->fl_flags |= FL_EXISTS;
4627         /* Exclude nfs_delegation_claim_locks() */
4628         mutex_lock(&sp->so_delegreturn_mutex);
4629         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4630         down_read(&nfsi->rwsem);
4631         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4632                 up_read(&nfsi->rwsem);
4633                 mutex_unlock(&sp->so_delegreturn_mutex);
4634                 goto out;
4635         }
4636         up_read(&nfsi->rwsem);
4637         mutex_unlock(&sp->so_delegreturn_mutex);
4638         if (status != 0)
4639                 goto out;
4640         /* Is this a delegated lock? */
4641         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4642                 goto out;
4643         lsp = request->fl_u.nfs4_fl.owner;
4644         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4645         status = -ENOMEM;
4646         if (seqid == NULL)
4647                 goto out;
4648         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4649         status = PTR_ERR(task);
4650         if (IS_ERR(task))
4651                 goto out;
4652         status = nfs4_wait_for_completion_rpc_task(task);
4653         rpc_put_task(task);
4654 out:
4655         request->fl_flags = fl_flags;
4656         return status;
4657 }
4658
4659 struct nfs4_lockdata {
4660         struct nfs_lock_args arg;
4661         struct nfs_lock_res res;
4662         struct nfs4_lock_state *lsp;
4663         struct nfs_open_context *ctx;
4664         struct file_lock fl;
4665         unsigned long timestamp;
4666         int rpc_status;
4667         int cancelled;
4668         struct nfs_server *server;
4669 };
4670
4671 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4672                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4673                 gfp_t gfp_mask)
4674 {
4675         struct nfs4_lockdata *p;
4676         struct inode *inode = lsp->ls_state->inode;
4677         struct nfs_server *server = NFS_SERVER(inode);
4678
4679         p = kzalloc(sizeof(*p), gfp_mask);
4680         if (p == NULL)
4681                 return NULL;
4682
4683         p->arg.fh = NFS_FH(inode);
4684         p->arg.fl = &p->fl;
4685         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4686         if (p->arg.open_seqid == NULL)
4687                 goto out_free;
4688         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4689         if (p->arg.lock_seqid == NULL)
4690                 goto out_free_seqid;
4691         p->arg.lock_stateid = &lsp->ls_stateid;
4692         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4693         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4694         p->arg.lock_owner.s_dev = server->s_dev;
4695         p->res.lock_seqid = p->arg.lock_seqid;
4696         p->lsp = lsp;
4697         p->server = server;
4698         atomic_inc(&lsp->ls_count);
4699         p->ctx = get_nfs_open_context(ctx);
4700         memcpy(&p->fl, fl, sizeof(p->fl));
4701         return p;
4702 out_free_seqid:
4703         nfs_free_seqid(p->arg.open_seqid);
4704 out_free:
4705         kfree(p);
4706         return NULL;
4707 }
4708
4709 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4710 {
4711         struct nfs4_lockdata *data = calldata;
4712         struct nfs4_state *state = data->lsp->ls_state;
4713
4714         dprintk("%s: begin!\n", __func__);
4715         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4716                 goto out_wait;
4717         /* Do we need to do an open_to_lock_owner? */
4718         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4719                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4720                         goto out_release_lock_seqid;
4721                 }
4722                 data->arg.open_stateid = &state->stateid;
4723                 data->arg.new_lock_owner = 1;
4724                 data->res.open_seqid = data->arg.open_seqid;
4725         } else
4726                 data->arg.new_lock_owner = 0;
4727         if (!nfs4_valid_open_stateid(state)) {
4728                 data->rpc_status = -EBADF;
4729                 task->tk_action = NULL;
4730                 goto out_release_open_seqid;
4731         }
4732         data->timestamp = jiffies;
4733         if (nfs4_setup_sequence(data->server,
4734                                 &data->arg.seq_args,
4735                                 &data->res.seq_res,
4736                                 task) == 0)
4737                 return;
4738 out_release_open_seqid:
4739         nfs_release_seqid(data->arg.open_seqid);
4740 out_release_lock_seqid:
4741         nfs_release_seqid(data->arg.lock_seqid);
4742 out_wait:
4743         nfs4_sequence_done(task, &data->res.seq_res);
4744         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4745 }
4746
4747 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4748 {
4749         struct nfs4_lockdata *data = calldata;
4750
4751         dprintk("%s: begin!\n", __func__);
4752
4753         if (!nfs4_sequence_done(task, &data->res.seq_res))
4754                 return;
4755
4756         data->rpc_status = task->tk_status;
4757         if (data->arg.new_lock_owner != 0) {
4758                 if (data->rpc_status == 0)
4759                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4760                 else
4761                         goto out;
4762         }
4763         if (data->rpc_status == 0) {
4764                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4765                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4766                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4767         }
4768 out:
4769         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4770 }
4771
4772 static void nfs4_lock_release(void *calldata)
4773 {
4774         struct nfs4_lockdata *data = calldata;
4775
4776         dprintk("%s: begin!\n", __func__);
4777         nfs_free_seqid(data->arg.open_seqid);
4778         if (data->cancelled != 0) {
4779                 struct rpc_task *task;
4780                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4781                                 data->arg.lock_seqid);
4782                 if (!IS_ERR(task))
4783                         rpc_put_task_async(task);
4784                 dprintk("%s: cancelling lock!\n", __func__);
4785         } else
4786                 nfs_free_seqid(data->arg.lock_seqid);
4787         nfs4_put_lock_state(data->lsp);
4788         put_nfs_open_context(data->ctx);
4789         kfree(data);
4790         dprintk("%s: done!\n", __func__);
4791 }
4792
4793 static const struct rpc_call_ops nfs4_lock_ops = {
4794         .rpc_call_prepare = nfs4_lock_prepare,
4795         .rpc_call_done = nfs4_lock_done,
4796         .rpc_release = nfs4_lock_release,
4797 };
4798
4799 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4800 {
4801         switch (error) {
4802         case -NFS4ERR_ADMIN_REVOKED:
4803         case -NFS4ERR_BAD_STATEID:
4804                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4805                 if (new_lock_owner != 0 ||
4806                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4807                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4808                 break;
4809         case -NFS4ERR_STALE_STATEID:
4810                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4811         case -NFS4ERR_EXPIRED:
4812                 nfs4_schedule_lease_recovery(server->nfs_client);
4813         };
4814 }
4815
4816 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4817 {
4818         struct nfs4_lockdata *data;
4819         struct rpc_task *task;
4820         struct rpc_message msg = {
4821                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4822                 .rpc_cred = state->owner->so_cred,
4823         };
4824         struct rpc_task_setup task_setup_data = {
4825                 .rpc_client = NFS_CLIENT(state->inode),
4826                 .rpc_message = &msg,
4827                 .callback_ops = &nfs4_lock_ops,
4828                 .workqueue = nfsiod_workqueue,
4829                 .flags = RPC_TASK_ASYNC,
4830         };
4831         int ret;
4832
4833         dprintk("%s: begin!\n", __func__);
4834         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4835                         fl->fl_u.nfs4_fl.owner,
4836                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4837         if (data == NULL)
4838                 return -ENOMEM;
4839         if (IS_SETLKW(cmd))
4840                 data->arg.block = 1;
4841         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4842         msg.rpc_argp = &data->arg;
4843         msg.rpc_resp = &data->res;
4844         task_setup_data.callback_data = data;
4845         if (recovery_type > NFS_LOCK_NEW) {
4846                 if (recovery_type == NFS_LOCK_RECLAIM)
4847                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4848                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4849         }
4850         task = rpc_run_task(&task_setup_data);
4851         if (IS_ERR(task))
4852                 return PTR_ERR(task);
4853         ret = nfs4_wait_for_completion_rpc_task(task);
4854         if (ret == 0) {
4855                 ret = data->rpc_status;
4856                 if (ret)
4857                         nfs4_handle_setlk_error(data->server, data->lsp,
4858                                         data->arg.new_lock_owner, ret);
4859         } else
4860                 data->cancelled = 1;
4861         rpc_put_task(task);
4862         dprintk("%s: done, ret = %d!\n", __func__, ret);
4863         return ret;
4864 }
4865
4866 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4867 {
4868         struct nfs_server *server = NFS_SERVER(state->inode);
4869         struct nfs4_exception exception = {
4870                 .inode = state->inode,
4871         };
4872         int err;
4873
4874         do {
4875                 /* Cache the lock if possible... */
4876                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4877                         return 0;
4878                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4879                 if (err != -NFS4ERR_DELAY)
4880                         break;
4881                 nfs4_handle_exception(server, err, &exception);
4882         } while (exception.retry);
4883         return err;
4884 }
4885
4886 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4887 {
4888         struct nfs_server *server = NFS_SERVER(state->inode);
4889         struct nfs4_exception exception = {
4890                 .inode = state->inode,
4891         };
4892         int err;
4893
4894         err = nfs4_set_lock_state(state, request);
4895         if (err != 0)
4896                 return err;
4897         do {
4898                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4899                         return 0;
4900                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4901                 switch (err) {
4902                 default:
4903                         goto out;
4904                 case -NFS4ERR_GRACE:
4905                 case -NFS4ERR_DELAY:
4906                         nfs4_handle_exception(server, err, &exception);
4907                         err = 0;
4908                 }
4909         } while (exception.retry);
4910 out:
4911         return err;
4912 }
4913
4914 #if defined(CONFIG_NFS_V4_1)
4915 /**
4916  * nfs41_check_expired_locks - possibly free a lock stateid
4917  *
4918  * @state: NFSv4 state for an inode
4919  *
4920  * Returns NFS_OK if recovery for this stateid is now finished.
4921  * Otherwise a negative NFS4ERR value is returned.
4922  */
4923 static int nfs41_check_expired_locks(struct nfs4_state *state)
4924 {
4925         int status, ret = -NFS4ERR_BAD_STATEID;
4926         struct nfs4_lock_state *lsp;
4927         struct nfs_server *server = NFS_SERVER(state->inode);
4928
4929         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4930                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4931                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4932                         if (status != NFS_OK) {
4933                                 /* Free the stateid unless the server
4934                                  * informs us the stateid is unrecognized. */
4935                                 if (status != -NFS4ERR_BAD_STATEID)
4936                                         nfs41_free_stateid(server,
4937                                                         &lsp->ls_stateid);
4938                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4939                                 ret = status;
4940                         }
4941                 }
4942         };
4943
4944         return ret;
4945 }
4946
4947 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4948 {
4949         int status = NFS_OK;
4950
4951         if (test_bit(LK_STATE_IN_USE, &state->flags))
4952                 status = nfs41_check_expired_locks(state);
4953         if (status != NFS_OK)
4954                 status = nfs4_lock_expired(state, request);
4955         return status;
4956 }
4957 #endif
4958
4959 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4960 {
4961         struct nfs4_state_owner *sp = state->owner;
4962         struct nfs_inode *nfsi = NFS_I(state->inode);
4963         unsigned char fl_flags = request->fl_flags;
4964         unsigned int seq;
4965         int status = -ENOLCK;
4966
4967         if ((fl_flags & FL_POSIX) &&
4968                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4969                 goto out;
4970         /* Is this a delegated open? */
4971         status = nfs4_set_lock_state(state, request);
4972         if (status != 0)
4973                 goto out;
4974         request->fl_flags |= FL_ACCESS;
4975         status = do_vfs_lock(request->fl_file, request);
4976         if (status < 0)
4977                 goto out;
4978         down_read(&nfsi->rwsem);
4979         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4980                 /* Yes: cache locks! */
4981                 /* ...but avoid races with delegation recall... */
4982                 request->fl_flags = fl_flags & ~FL_SLEEP;
4983                 status = do_vfs_lock(request->fl_file, request);
4984                 goto out_unlock;
4985         }
4986         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
4987         up_read(&nfsi->rwsem);
4988         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4989         if (status != 0)
4990                 goto out;
4991         down_read(&nfsi->rwsem);
4992         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
4993                 status = -NFS4ERR_DELAY;
4994                 goto out_unlock;
4995         }
4996         /* Note: we always want to sleep here! */
4997         request->fl_flags = fl_flags | FL_SLEEP;
4998         if (do_vfs_lock(request->fl_file, request) < 0)
4999                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5000                         "manager!\n", __func__);
5001 out_unlock:
5002         up_read(&nfsi->rwsem);
5003 out:
5004         request->fl_flags = fl_flags;
5005         return status;
5006 }
5007
5008 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5009 {
5010         struct nfs4_exception exception = {
5011                 .state = state,
5012                 .inode = state->inode,
5013         };
5014         int err;
5015
5016         do {
5017                 err = _nfs4_proc_setlk(state, cmd, request);
5018                 if (err == -NFS4ERR_DENIED)
5019                         err = -EAGAIN;
5020                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5021                                 err, &exception);
5022         } while (exception.retry);
5023         return err;
5024 }
5025
5026 static int
5027 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5028 {
5029         struct nfs_open_context *ctx;
5030         struct nfs4_state *state;
5031         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5032         int status;
5033
5034         /* verify open state */
5035         ctx = nfs_file_open_context(filp);
5036         state = ctx->state;
5037
5038         if (request->fl_start < 0 || request->fl_end < 0)
5039                 return -EINVAL;
5040
5041         if (IS_GETLK(cmd)) {
5042                 if (state != NULL)
5043                         return nfs4_proc_getlk(state, F_GETLK, request);
5044                 return 0;
5045         }
5046
5047         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5048                 return -EINVAL;
5049
5050         if (request->fl_type == F_UNLCK) {
5051                 if (state != NULL)
5052                         return nfs4_proc_unlck(state, cmd, request);
5053                 return 0;
5054         }
5055
5056         if (state == NULL)
5057                 return -ENOLCK;
5058         /*
5059          * Don't rely on the VFS having checked the file open mode,
5060          * since it won't do this for flock() locks.
5061          */
5062         switch (request->fl_type) {
5063         case F_RDLCK:
5064                 if (!(filp->f_mode & FMODE_READ))
5065                         return -EBADF;
5066                 break;
5067         case F_WRLCK:
5068                 if (!(filp->f_mode & FMODE_WRITE))
5069                         return -EBADF;
5070         }
5071
5072         do {
5073                 status = nfs4_proc_setlk(state, cmd, request);
5074                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5075                         break;
5076                 timeout = nfs4_set_lock_task_retry(timeout);
5077                 status = -ERESTARTSYS;
5078                 if (signalled())
5079                         break;
5080         } while(status < 0);
5081         return status;
5082 }
5083
5084 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
5085 {
5086         struct nfs_server *server = NFS_SERVER(state->inode);
5087         struct nfs4_exception exception = { };
5088         int err;
5089
5090         err = nfs4_set_lock_state(state, fl);
5091         if (err != 0)
5092                 goto out;
5093         do {
5094                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5095                 switch (err) {
5096                         default:
5097                                 printk(KERN_ERR "NFS: %s: unhandled error "
5098                                         "%d.\n", __func__, err);
5099                         case 0:
5100                         case -ESTALE:
5101                                 goto out;
5102                         case -NFS4ERR_STALE_CLIENTID:
5103                         case -NFS4ERR_STALE_STATEID:
5104                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5105                         case -NFS4ERR_EXPIRED:
5106                                 nfs4_schedule_lease_recovery(server->nfs_client);
5107                                 err = -EAGAIN;
5108                                 goto out;
5109                         case -NFS4ERR_BADSESSION:
5110                         case -NFS4ERR_BADSLOT:
5111                         case -NFS4ERR_BAD_HIGH_SLOT:
5112                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5113                         case -NFS4ERR_DEADSESSION:
5114                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5115                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5116                                 err = -EAGAIN;
5117                                 goto out;
5118                         case -NFS4ERR_DELEG_REVOKED:
5119                         case -NFS4ERR_ADMIN_REVOKED:
5120                         case -NFS4ERR_BAD_STATEID:
5121                         case -NFS4ERR_OPENMODE:
5122                                 nfs4_schedule_stateid_recovery(server, state);
5123                                 err = 0;
5124                                 goto out;
5125                         case -ENOMEM:
5126                         case -NFS4ERR_DENIED:
5127                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5128                                 err = 0;
5129                                 goto out;
5130                 }
5131                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5132                 err = nfs4_handle_exception(server, err, &exception);
5133         } while (exception.retry);
5134 out:
5135         return err;
5136 }
5137
5138 struct nfs_release_lockowner_data {
5139         struct nfs4_lock_state *lsp;
5140         struct nfs_server *server;
5141         struct nfs_release_lockowner_args args;
5142 };
5143
5144 static void nfs4_release_lockowner_release(void *calldata)
5145 {
5146         struct nfs_release_lockowner_data *data = calldata;
5147         nfs4_free_lock_state(data->server, data->lsp);
5148         kfree(calldata);
5149 }
5150
5151 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5152         .rpc_release = nfs4_release_lockowner_release,
5153 };
5154
5155 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5156 {
5157         struct nfs_server *server = lsp->ls_state->owner->so_server;
5158         struct nfs_release_lockowner_data *data;
5159         struct rpc_message msg = {
5160                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5161         };
5162
5163         if (server->nfs_client->cl_mvops->minor_version != 0)
5164                 return -EINVAL;
5165         data = kmalloc(sizeof(*data), GFP_NOFS);
5166         if (!data)
5167                 return -ENOMEM;
5168         data->lsp = lsp;
5169         data->server = server;
5170         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5171         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5172         data->args.lock_owner.s_dev = server->s_dev;
5173         msg.rpc_argp = &data->args;
5174         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5175         return 0;
5176 }
5177
5178 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5179
5180 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5181                                    const void *buf, size_t buflen,
5182                                    int flags, int type)
5183 {
5184         if (strcmp(key, "") != 0)
5185                 return -EINVAL;
5186
5187         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5188 }
5189
5190 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5191                                    void *buf, size_t buflen, int type)
5192 {
5193         if (strcmp(key, "") != 0)
5194                 return -EINVAL;
5195
5196         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5197 }
5198
5199 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5200                                        size_t list_len, const char *name,
5201                                        size_t name_len, int type)
5202 {
5203         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5204
5205         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5206                 return 0;
5207
5208         if (list && len <= list_len)
5209                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5210         return len;
5211 }
5212
5213 /*
5214  * nfs_fhget will use either the mounted_on_fileid or the fileid
5215  */
5216 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5217 {
5218         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5219                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5220               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5221               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5222                 return;
5223
5224         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5225                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5226         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5227         fattr->nlink = 2;
5228 }
5229
5230 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5231                                    const struct qstr *name,
5232                                    struct nfs4_fs_locations *fs_locations,
5233                                    struct page *page)
5234 {
5235         struct nfs_server *server = NFS_SERVER(dir);
5236         u32 bitmask[2] = {
5237                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5238         };
5239         struct nfs4_fs_locations_arg args = {
5240                 .dir_fh = NFS_FH(dir),
5241                 .name = name,
5242                 .page = page,
5243                 .bitmask = bitmask,
5244         };
5245         struct nfs4_fs_locations_res res = {
5246                 .fs_locations = fs_locations,
5247         };
5248         struct rpc_message msg = {
5249                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5250                 .rpc_argp = &args,
5251                 .rpc_resp = &res,
5252         };
5253         int status;
5254
5255         dprintk("%s: start\n", __func__);
5256
5257         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5258          * is not supported */
5259         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5260                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5261         else
5262                 bitmask[0] |= FATTR4_WORD0_FILEID;
5263
5264         nfs_fattr_init(&fs_locations->fattr);
5265         fs_locations->server = server;
5266         fs_locations->nlocations = 0;
5267         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5268         dprintk("%s: returned status = %d\n", __func__, status);
5269         return status;
5270 }
5271
5272 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5273                            const struct qstr *name,
5274                            struct nfs4_fs_locations *fs_locations,
5275                            struct page *page)
5276 {
5277         struct nfs4_exception exception = { };
5278         int err;
5279         do {
5280                 err = nfs4_handle_exception(NFS_SERVER(dir),
5281                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5282                                 &exception);
5283         } while (exception.retry);
5284         return err;
5285 }
5286
5287 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5288 {
5289         int status;
5290         struct nfs4_secinfo_arg args = {
5291                 .dir_fh = NFS_FH(dir),
5292                 .name   = name,
5293         };
5294         struct nfs4_secinfo_res res = {
5295                 .flavors     = flavors,
5296         };
5297         struct rpc_message msg = {
5298                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5299                 .rpc_argp = &args,
5300                 .rpc_resp = &res,
5301         };
5302
5303         dprintk("NFS call  secinfo %s\n", name->name);
5304         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5305         dprintk("NFS reply  secinfo: %d\n", status);
5306         return status;
5307 }
5308
5309 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5310                       struct nfs4_secinfo_flavors *flavors)
5311 {
5312         struct nfs4_exception exception = { };
5313         int err;
5314         do {
5315                 err = nfs4_handle_exception(NFS_SERVER(dir),
5316                                 _nfs4_proc_secinfo(dir, name, flavors),
5317                                 &exception);
5318         } while (exception.retry);
5319         return err;
5320 }
5321
5322 #ifdef CONFIG_NFS_V4_1
5323 /*
5324  * Check the exchange flags returned by the server for invalid flags, having
5325  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5326  * DS flags set.
5327  */
5328 static int nfs4_check_cl_exchange_flags(u32 flags)
5329 {
5330         if (flags & ~EXCHGID4_FLAG_MASK_R)
5331                 goto out_inval;
5332         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5333             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5334                 goto out_inval;
5335         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5336                 goto out_inval;
5337         return NFS_OK;
5338 out_inval:
5339         return -NFS4ERR_INVAL;
5340 }
5341
5342 static bool
5343 nfs41_same_server_scope(struct nfs41_server_scope *a,
5344                         struct nfs41_server_scope *b)
5345 {
5346         if (a->server_scope_sz == b->server_scope_sz &&
5347             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5348                 return true;
5349
5350         return false;
5351 }
5352
5353 /*
5354  * nfs4_proc_bind_conn_to_session()
5355  *
5356  * The 4.1 client currently uses the same TCP connection for the
5357  * fore and backchannel.
5358  */
5359 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5360 {
5361         int status;
5362         struct nfs41_bind_conn_to_session_res res;
5363         struct rpc_message msg = {
5364                 .rpc_proc =
5365                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5366                 .rpc_argp = clp,
5367                 .rpc_resp = &res,
5368                 .rpc_cred = cred,
5369         };
5370
5371         dprintk("--> %s\n", __func__);
5372
5373         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5374         if (unlikely(res.session == NULL)) {
5375                 status = -ENOMEM;
5376                 goto out;
5377         }
5378
5379         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5380         if (status == 0) {
5381                 if (memcmp(res.session->sess_id.data,
5382                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5383                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5384                         status = -EIO;
5385                         goto out_session;
5386                 }
5387                 if (res.dir != NFS4_CDFS4_BOTH) {
5388                         dprintk("NFS: %s: Unexpected direction from server\n",
5389                                 __func__);
5390                         status = -EIO;
5391                         goto out_session;
5392                 }
5393                 if (res.use_conn_in_rdma_mode) {
5394                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5395                                 __func__);
5396                         status = -EIO;
5397                         goto out_session;
5398                 }
5399         }
5400 out_session:
5401         kfree(res.session);
5402 out:
5403         dprintk("<-- %s status= %d\n", __func__, status);
5404         return status;
5405 }
5406
5407 /*
5408  * nfs4_proc_exchange_id()
5409  *
5410  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5411  *
5412  * Since the clientid has expired, all compounds using sessions
5413  * associated with the stale clientid will be returning
5414  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5415  * be in some phase of session reset.
5416  */
5417 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5418 {
5419         nfs4_verifier verifier;
5420         struct nfs41_exchange_id_args args = {
5421                 .verifier = &verifier,
5422                 .client = clp,
5423                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5424         };
5425         struct nfs41_exchange_id_res res = {
5426                 0
5427         };
5428         int status;
5429         struct rpc_message msg = {
5430                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5431                 .rpc_argp = &args,
5432                 .rpc_resp = &res,
5433                 .rpc_cred = cred,
5434         };
5435
5436         nfs4_init_boot_verifier(clp, &verifier);
5437         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5438                                                         sizeof(args.id));
5439         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5440                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5441                 args.id_len, args.id);
5442
5443         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5444                                         GFP_NOFS);
5445         if (unlikely(res.server_owner == NULL)) {
5446                 status = -ENOMEM;
5447                 goto out;
5448         }
5449
5450         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5451                                         GFP_NOFS);
5452         if (unlikely(res.server_scope == NULL)) {
5453                 status = -ENOMEM;
5454                 goto out_server_owner;
5455         }
5456
5457         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5458         if (unlikely(res.impl_id == NULL)) {
5459                 status = -ENOMEM;
5460                 goto out_server_scope;
5461         }
5462
5463         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5464         if (status == 0)
5465                 status = nfs4_check_cl_exchange_flags(res.flags);
5466
5467         if (status == 0) {
5468                 clp->cl_clientid = res.clientid;
5469                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5470                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5471                         clp->cl_seqid = res.seqid;
5472
5473                 kfree(clp->cl_serverowner);
5474                 clp->cl_serverowner = res.server_owner;
5475                 res.server_owner = NULL;
5476
5477                 /* use the most recent implementation id */
5478                 kfree(clp->cl_implid);
5479                 clp->cl_implid = res.impl_id;
5480
5481                 if (clp->cl_serverscope != NULL &&
5482                     !nfs41_same_server_scope(clp->cl_serverscope,
5483                                              res.server_scope)) {
5484                         dprintk("%s: server_scope mismatch detected\n",
5485                                 __func__);
5486                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5487                         kfree(clp->cl_serverscope);
5488                         clp->cl_serverscope = NULL;
5489                 }
5490
5491                 if (clp->cl_serverscope == NULL) {
5492                         clp->cl_serverscope = res.server_scope;
5493                         goto out;
5494                 }
5495         } else
5496                 kfree(res.impl_id);
5497
5498 out_server_owner:
5499         kfree(res.server_owner);
5500 out_server_scope:
5501         kfree(res.server_scope);
5502 out:
5503         if (clp->cl_implid != NULL)
5504                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5505                         "domain: %s, name: %s, date: %llu,%u\n",
5506                         clp->cl_implid->domain, clp->cl_implid->name,
5507                         clp->cl_implid->date.seconds,
5508                         clp->cl_implid->date.nseconds);
5509         dprintk("NFS reply exchange_id: %d\n", status);
5510         return status;
5511 }
5512
5513 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5514                 struct rpc_cred *cred)
5515 {
5516         struct rpc_message msg = {
5517                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5518                 .rpc_argp = clp,
5519                 .rpc_cred = cred,
5520         };
5521         int status;
5522
5523         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5524         if (status)
5525                 dprintk("NFS: Got error %d from the server %s on "
5526                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5527         return status;
5528 }
5529
5530 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5531                 struct rpc_cred *cred)
5532 {
5533         unsigned int loop;
5534         int ret;
5535
5536         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5537                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5538                 switch (ret) {
5539                 case -NFS4ERR_DELAY:
5540                 case -NFS4ERR_CLIENTID_BUSY:
5541                         ssleep(1);
5542                         break;
5543                 default:
5544                         return ret;
5545                 }
5546         }
5547         return 0;
5548 }
5549
5550 int nfs4_destroy_clientid(struct nfs_client *clp)
5551 {
5552         struct rpc_cred *cred;
5553         int ret = 0;
5554
5555         if (clp->cl_mvops->minor_version < 1)
5556                 goto out;
5557         if (clp->cl_exchange_flags == 0)
5558                 goto out;
5559         if (clp->cl_preserve_clid)
5560                 goto out;
5561         cred = nfs4_get_exchange_id_cred(clp);
5562         ret = nfs4_proc_destroy_clientid(clp, cred);
5563         if (cred)
5564                 put_rpccred(cred);
5565         switch (ret) {
5566         case 0:
5567         case -NFS4ERR_STALE_CLIENTID:
5568                 clp->cl_exchange_flags = 0;
5569         }
5570 out:
5571         return ret;
5572 }
5573
5574 struct nfs4_get_lease_time_data {
5575         struct nfs4_get_lease_time_args *args;
5576         struct nfs4_get_lease_time_res *res;
5577         struct nfs_client *clp;
5578 };
5579
5580 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5581                                         void *calldata)
5582 {
5583         struct nfs4_get_lease_time_data *data =
5584                         (struct nfs4_get_lease_time_data *)calldata;
5585
5586         dprintk("--> %s\n", __func__);
5587         /* just setup sequence, do not trigger session recovery
5588            since we're invoked within one */
5589         nfs41_setup_sequence(data->clp->cl_session,
5590                         &data->args->la_seq_args,
5591                         &data->res->lr_seq_res,
5592                         task);
5593         dprintk("<-- %s\n", __func__);
5594 }
5595
5596 /*
5597  * Called from nfs4_state_manager thread for session setup, so don't recover
5598  * from sequence operation or clientid errors.
5599  */
5600 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5601 {
5602         struct nfs4_get_lease_time_data *data =
5603                         (struct nfs4_get_lease_time_data *)calldata;
5604
5605         dprintk("--> %s\n", __func__);
5606         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5607                 return;
5608         switch (task->tk_status) {
5609         case -NFS4ERR_DELAY:
5610         case -NFS4ERR_GRACE:
5611                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5612                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5613                 task->tk_status = 0;
5614                 /* fall through */
5615         case -NFS4ERR_RETRY_UNCACHED_REP:
5616                 rpc_restart_call_prepare(task);
5617                 return;
5618         }
5619         dprintk("<-- %s\n", __func__);
5620 }
5621
5622 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5623         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5624         .rpc_call_done = nfs4_get_lease_time_done,
5625 };
5626
5627 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5628 {
5629         struct rpc_task *task;
5630         struct nfs4_get_lease_time_args args;
5631         struct nfs4_get_lease_time_res res = {
5632                 .lr_fsinfo = fsinfo,
5633         };
5634         struct nfs4_get_lease_time_data data = {
5635                 .args = &args,
5636                 .res = &res,
5637                 .clp = clp,
5638         };
5639         struct rpc_message msg = {
5640                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5641                 .rpc_argp = &args,
5642                 .rpc_resp = &res,
5643         };
5644         struct rpc_task_setup task_setup = {
5645                 .rpc_client = clp->cl_rpcclient,
5646                 .rpc_message = &msg,
5647                 .callback_ops = &nfs4_get_lease_time_ops,
5648                 .callback_data = &data,
5649                 .flags = RPC_TASK_TIMEOUT,
5650         };
5651         int status;
5652
5653         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5654         nfs4_set_sequence_privileged(&args.la_seq_args);
5655         dprintk("--> %s\n", __func__);
5656         task = rpc_run_task(&task_setup);
5657
5658         if (IS_ERR(task))
5659                 status = PTR_ERR(task);
5660         else {
5661                 status = task->tk_status;
5662                 rpc_put_task(task);
5663         }
5664         dprintk("<-- %s return %d\n", __func__, status);
5665
5666         return status;
5667 }
5668
5669 /*
5670  * Initialize the values to be used by the client in CREATE_SESSION
5671  * If nfs4_init_session set the fore channel request and response sizes,
5672  * use them.
5673  *
5674  * Set the back channel max_resp_sz_cached to zero to force the client to
5675  * always set csa_cachethis to FALSE because the current implementation
5676  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5677  */
5678 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5679 {
5680         struct nfs4_session *session = args->client->cl_session;
5681         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5682                      mxresp_sz = session->fc_target_max_resp_sz;
5683
5684         if (mxrqst_sz == 0)
5685                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5686         if (mxresp_sz == 0)
5687                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5688         /* Fore channel attributes */
5689         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5690         args->fc_attrs.max_resp_sz = mxresp_sz;
5691         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5692         args->fc_attrs.max_reqs = max_session_slots;
5693
5694         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5695                 "max_ops=%u max_reqs=%u\n",
5696                 __func__,
5697                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5698                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5699
5700         /* Back channel attributes */
5701         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5702         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5703         args->bc_attrs.max_resp_sz_cached = 0;
5704         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5705         args->bc_attrs.max_reqs = 1;
5706
5707         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5708                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5709                 __func__,
5710                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5711                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5712                 args->bc_attrs.max_reqs);
5713 }
5714
5715 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5716 {
5717         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5718         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5719
5720         if (rcvd->max_resp_sz > sent->max_resp_sz)
5721                 return -EINVAL;
5722         /*
5723          * Our requested max_ops is the minimum we need; we're not
5724          * prepared to break up compounds into smaller pieces than that.
5725          * So, no point even trying to continue if the server won't
5726          * cooperate:
5727          */
5728         if (rcvd->max_ops < sent->max_ops)
5729                 return -EINVAL;
5730         if (rcvd->max_reqs == 0)
5731                 return -EINVAL;
5732         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5733                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5734         return 0;
5735 }
5736
5737 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5738 {
5739         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5740         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5741
5742         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5743                 return -EINVAL;
5744         if (rcvd->max_resp_sz < sent->max_resp_sz)
5745                 return -EINVAL;
5746         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5747                 return -EINVAL;
5748         /* These would render the backchannel useless: */
5749         if (rcvd->max_ops != sent->max_ops)
5750                 return -EINVAL;
5751         if (rcvd->max_reqs != sent->max_reqs)
5752                 return -EINVAL;
5753         return 0;
5754 }
5755
5756 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5757                                      struct nfs4_session *session)
5758 {
5759         int ret;
5760
5761         ret = nfs4_verify_fore_channel_attrs(args, session);
5762         if (ret)
5763                 return ret;
5764         return nfs4_verify_back_channel_attrs(args, session);
5765 }
5766
5767 static int _nfs4_proc_create_session(struct nfs_client *clp,
5768                 struct rpc_cred *cred)
5769 {
5770         struct nfs4_session *session = clp->cl_session;
5771         struct nfs41_create_session_args args = {
5772                 .client = clp,
5773                 .cb_program = NFS4_CALLBACK,
5774         };
5775         struct nfs41_create_session_res res = {
5776                 .client = clp,
5777         };
5778         struct rpc_message msg = {
5779                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5780                 .rpc_argp = &args,
5781                 .rpc_resp = &res,
5782                 .rpc_cred = cred,
5783         };
5784         int status;
5785
5786         nfs4_init_channel_attrs(&args);
5787         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5788
5789         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5790
5791         if (!status) {
5792                 /* Verify the session's negotiated channel_attrs values */
5793                 status = nfs4_verify_channel_attrs(&args, session);
5794                 /* Increment the clientid slot sequence id */
5795                 clp->cl_seqid++;
5796         }
5797
5798         return status;
5799 }
5800
5801 /*
5802  * Issues a CREATE_SESSION operation to the server.
5803  * It is the responsibility of the caller to verify the session is
5804  * expired before calling this routine.
5805  */
5806 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5807 {
5808         int status;
5809         unsigned *ptr;
5810         struct nfs4_session *session = clp->cl_session;
5811
5812         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5813
5814         status = _nfs4_proc_create_session(clp, cred);
5815         if (status)
5816                 goto out;
5817
5818         /* Init or reset the session slot tables */
5819         status = nfs4_setup_session_slot_tables(session);
5820         dprintk("slot table setup returned %d\n", status);
5821         if (status)
5822                 goto out;
5823
5824         ptr = (unsigned *)&session->sess_id.data[0];
5825         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5826                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5827 out:
5828         dprintk("<-- %s\n", __func__);
5829         return status;
5830 }
5831
5832 /*
5833  * Issue the over-the-wire RPC DESTROY_SESSION.
5834  * The caller must serialize access to this routine.
5835  */
5836 int nfs4_proc_destroy_session(struct nfs4_session *session,
5837                 struct rpc_cred *cred)
5838 {
5839         struct rpc_message msg = {
5840                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5841                 .rpc_argp = session,
5842                 .rpc_cred = cred,
5843         };
5844         int status = 0;
5845
5846         dprintk("--> nfs4_proc_destroy_session\n");
5847
5848         /* session is still being setup */
5849         if (session->clp->cl_cons_state != NFS_CS_READY)
5850                 return status;
5851
5852         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5853
5854         if (status)
5855                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5856                         "Session has been destroyed regardless...\n", status);
5857
5858         dprintk("<-- nfs4_proc_destroy_session\n");
5859         return status;
5860 }
5861
5862 /*
5863  * Renew the cl_session lease.
5864  */
5865 struct nfs4_sequence_data {
5866         struct nfs_client *clp;
5867         struct nfs4_sequence_args args;
5868         struct nfs4_sequence_res res;
5869 };
5870
5871 static void nfs41_sequence_release(void *data)
5872 {
5873         struct nfs4_sequence_data *calldata = data;
5874         struct nfs_client *clp = calldata->clp;
5875
5876         if (atomic_read(&clp->cl_count) > 1)
5877                 nfs4_schedule_state_renewal(clp);
5878         nfs_put_client(clp);
5879         kfree(calldata);
5880 }
5881
5882 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5883 {
5884         switch(task->tk_status) {
5885         case -NFS4ERR_DELAY:
5886                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5887                 return -EAGAIN;
5888         default:
5889                 nfs4_schedule_lease_recovery(clp);
5890         }
5891         return 0;
5892 }
5893
5894 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5895 {
5896         struct nfs4_sequence_data *calldata = data;
5897         struct nfs_client *clp = calldata->clp;
5898
5899         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5900                 return;
5901
5902         if (task->tk_status < 0) {
5903                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5904                 if (atomic_read(&clp->cl_count) == 1)
5905                         goto out;
5906
5907                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5908                         rpc_restart_call_prepare(task);
5909                         return;
5910                 }
5911         }
5912         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5913 out:
5914         dprintk("<-- %s\n", __func__);
5915 }
5916
5917 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5918 {
5919         struct nfs4_sequence_data *calldata = data;
5920         struct nfs_client *clp = calldata->clp;
5921         struct nfs4_sequence_args *args;
5922         struct nfs4_sequence_res *res;
5923
5924         args = task->tk_msg.rpc_argp;
5925         res = task->tk_msg.rpc_resp;
5926
5927         nfs41_setup_sequence(clp->cl_session, args, res, task);
5928 }
5929
5930 static const struct rpc_call_ops nfs41_sequence_ops = {
5931         .rpc_call_done = nfs41_sequence_call_done,
5932         .rpc_call_prepare = nfs41_sequence_prepare,
5933         .rpc_release = nfs41_sequence_release,
5934 };
5935
5936 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5937                 struct rpc_cred *cred,
5938                 bool is_privileged)
5939 {
5940         struct nfs4_sequence_data *calldata;
5941         struct rpc_message msg = {
5942                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5943                 .rpc_cred = cred,
5944         };
5945         struct rpc_task_setup task_setup_data = {
5946                 .rpc_client = clp->cl_rpcclient,
5947                 .rpc_message = &msg,
5948                 .callback_ops = &nfs41_sequence_ops,
5949                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5950         };
5951
5952         if (!atomic_inc_not_zero(&clp->cl_count))
5953                 return ERR_PTR(-EIO);
5954         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5955         if (calldata == NULL) {
5956                 nfs_put_client(clp);
5957                 return ERR_PTR(-ENOMEM);
5958         }
5959         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5960         if (is_privileged)
5961                 nfs4_set_sequence_privileged(&calldata->args);
5962         msg.rpc_argp = &calldata->args;
5963         msg.rpc_resp = &calldata->res;
5964         calldata->clp = clp;
5965         task_setup_data.callback_data = calldata;
5966
5967         return rpc_run_task(&task_setup_data);
5968 }
5969
5970 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5971 {
5972         struct rpc_task *task;
5973         int ret = 0;
5974
5975         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5976                 return 0;
5977         task = _nfs41_proc_sequence(clp, cred, false);
5978         if (IS_ERR(task))
5979                 ret = PTR_ERR(task);
5980         else
5981                 rpc_put_task_async(task);
5982         dprintk("<-- %s status=%d\n", __func__, ret);
5983         return ret;
5984 }
5985
5986 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5987 {
5988         struct rpc_task *task;
5989         int ret;
5990
5991         task = _nfs41_proc_sequence(clp, cred, true);
5992         if (IS_ERR(task)) {
5993                 ret = PTR_ERR(task);
5994                 goto out;
5995         }
5996         ret = rpc_wait_for_completion_task(task);
5997         if (!ret) {
5998                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5999
6000                 if (task->tk_status == 0)
6001                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6002                 ret = task->tk_status;
6003         }
6004         rpc_put_task(task);
6005 out:
6006         dprintk("<-- %s status=%d\n", __func__, ret);
6007         return ret;
6008 }
6009
6010 struct nfs4_reclaim_complete_data {
6011         struct nfs_client *clp;
6012         struct nfs41_reclaim_complete_args arg;
6013         struct nfs41_reclaim_complete_res res;
6014 };
6015
6016 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6017 {
6018         struct nfs4_reclaim_complete_data *calldata = data;
6019
6020         nfs41_setup_sequence(calldata->clp->cl_session,
6021                         &calldata->arg.seq_args,
6022                         &calldata->res.seq_res,
6023                         task);
6024 }
6025
6026 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6027 {
6028         switch(task->tk_status) {
6029         case 0:
6030         case -NFS4ERR_COMPLETE_ALREADY:
6031         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6032                 break;
6033         case -NFS4ERR_DELAY:
6034                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6035                 /* fall through */
6036         case -NFS4ERR_RETRY_UNCACHED_REP:
6037                 return -EAGAIN;
6038         default:
6039                 nfs4_schedule_lease_recovery(clp);
6040         }
6041         return 0;
6042 }
6043
6044 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6045 {
6046         struct nfs4_reclaim_complete_data *calldata = data;
6047         struct nfs_client *clp = calldata->clp;
6048         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6049
6050         dprintk("--> %s\n", __func__);
6051         if (!nfs41_sequence_done(task, res))
6052                 return;
6053
6054         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6055                 rpc_restart_call_prepare(task);
6056                 return;
6057         }
6058         dprintk("<-- %s\n", __func__);
6059 }
6060
6061 static void nfs4_free_reclaim_complete_data(void *data)
6062 {
6063         struct nfs4_reclaim_complete_data *calldata = data;
6064
6065         kfree(calldata);
6066 }
6067
6068 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6069         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6070         .rpc_call_done = nfs4_reclaim_complete_done,
6071         .rpc_release = nfs4_free_reclaim_complete_data,
6072 };
6073
6074 /*
6075  * Issue a global reclaim complete.
6076  */
6077 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6078 {
6079         struct nfs4_reclaim_complete_data *calldata;
6080         struct rpc_task *task;
6081         struct rpc_message msg = {
6082                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6083         };
6084         struct rpc_task_setup task_setup_data = {
6085                 .rpc_client = clp->cl_rpcclient,
6086                 .rpc_message = &msg,
6087                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6088                 .flags = RPC_TASK_ASYNC,
6089         };
6090         int status = -ENOMEM;
6091
6092         dprintk("--> %s\n", __func__);
6093         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6094         if (calldata == NULL)
6095                 goto out;
6096         calldata->clp = clp;
6097         calldata->arg.one_fs = 0;
6098
6099         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6100         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6101         msg.rpc_argp = &calldata->arg;
6102         msg.rpc_resp = &calldata->res;
6103         task_setup_data.callback_data = calldata;
6104         task = rpc_run_task(&task_setup_data);
6105         if (IS_ERR(task)) {
6106                 status = PTR_ERR(task);
6107                 goto out;
6108         }
6109         status = nfs4_wait_for_completion_rpc_task(task);
6110         if (status == 0)
6111                 status = task->tk_status;
6112         rpc_put_task(task);
6113         return 0;
6114 out:
6115         dprintk("<-- %s status=%d\n", __func__, status);
6116         return status;
6117 }
6118
6119 static void
6120 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6121 {
6122         struct nfs4_layoutget *lgp = calldata;
6123         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6124         struct nfs4_session *session = nfs4_get_session(server);
6125
6126         dprintk("--> %s\n", __func__);
6127         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6128          * right now covering the LAYOUTGET we are about to send.
6129          * However, that is not so catastrophic, and there seems
6130          * to be no way to prevent it completely.
6131          */
6132         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6133                                 &lgp->res.seq_res, task))
6134                 return;
6135         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6136                                           NFS_I(lgp->args.inode)->layout,
6137                                           lgp->args.ctx->state)) {
6138                 rpc_exit(task, NFS4_OK);
6139         }
6140 }
6141
6142 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6143 {
6144         struct nfs4_layoutget *lgp = calldata;
6145         struct inode *inode = lgp->args.inode;
6146         struct nfs_server *server = NFS_SERVER(inode);
6147         struct pnfs_layout_hdr *lo;
6148         struct nfs4_state *state = NULL;
6149         unsigned long timeo, giveup;
6150
6151         dprintk("--> %s\n", __func__);
6152
6153         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6154                 goto out;
6155
6156         switch (task->tk_status) {
6157         case 0:
6158                 goto out;
6159         case -NFS4ERR_LAYOUTTRYLATER:
6160         case -NFS4ERR_RECALLCONFLICT:
6161                 timeo = rpc_get_timeout(task->tk_client);
6162                 giveup = lgp->args.timestamp + timeo;
6163                 if (time_after(giveup, jiffies))
6164                         task->tk_status = -NFS4ERR_DELAY;
6165                 break;
6166         case -NFS4ERR_EXPIRED:
6167         case -NFS4ERR_BAD_STATEID:
6168                 spin_lock(&inode->i_lock);
6169                 lo = NFS_I(inode)->layout;
6170                 if (!lo || list_empty(&lo->plh_segs)) {
6171                         spin_unlock(&inode->i_lock);
6172                         /* If the open stateid was bad, then recover it. */
6173                         state = lgp->args.ctx->state;
6174                 } else {
6175                         LIST_HEAD(head);
6176
6177                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6178                         spin_unlock(&inode->i_lock);
6179                         /* Mark the bad layout state as invalid, then
6180                          * retry using the open stateid. */
6181                         pnfs_free_lseg_list(&head);
6182                 }
6183         }
6184         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6185                 rpc_restart_call_prepare(task);
6186 out:
6187         dprintk("<-- %s\n", __func__);
6188 }
6189
6190 static size_t max_response_pages(struct nfs_server *server)
6191 {
6192         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6193         return nfs_page_array_len(0, max_resp_sz);
6194 }
6195
6196 static void nfs4_free_pages(struct page **pages, size_t size)
6197 {
6198         int i;
6199
6200         if (!pages)
6201                 return;
6202
6203         for (i = 0; i < size; i++) {
6204                 if (!pages[i])
6205                         break;
6206                 __free_page(pages[i]);
6207         }
6208         kfree(pages);
6209 }
6210
6211 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6212 {
6213         struct page **pages;
6214         int i;
6215
6216         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6217         if (!pages) {
6218                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6219                 return NULL;
6220         }
6221
6222         for (i = 0; i < size; i++) {
6223                 pages[i] = alloc_page(gfp_flags);
6224                 if (!pages[i]) {
6225                         dprintk("%s: failed to allocate page\n", __func__);
6226                         nfs4_free_pages(pages, size);
6227                         return NULL;
6228                 }
6229         }
6230
6231         return pages;
6232 }
6233
6234 static void nfs4_layoutget_release(void *calldata)
6235 {
6236         struct nfs4_layoutget *lgp = calldata;
6237         struct inode *inode = lgp->args.inode;
6238         struct nfs_server *server = NFS_SERVER(inode);
6239         size_t max_pages = max_response_pages(server);
6240
6241         dprintk("--> %s\n", __func__);
6242         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6243         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6244         put_nfs_open_context(lgp->args.ctx);
6245         kfree(calldata);
6246         dprintk("<-- %s\n", __func__);
6247 }
6248
6249 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6250         .rpc_call_prepare = nfs4_layoutget_prepare,
6251         .rpc_call_done = nfs4_layoutget_done,
6252         .rpc_release = nfs4_layoutget_release,
6253 };
6254
6255 struct pnfs_layout_segment *
6256 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6257 {
6258         struct inode *inode = lgp->args.inode;
6259         struct nfs_server *server = NFS_SERVER(inode);
6260         size_t max_pages = max_response_pages(server);
6261         struct rpc_task *task;
6262         struct rpc_message msg = {
6263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6264                 .rpc_argp = &lgp->args,
6265                 .rpc_resp = &lgp->res,
6266         };
6267         struct rpc_task_setup task_setup_data = {
6268                 .rpc_client = server->client,
6269                 .rpc_message = &msg,
6270                 .callback_ops = &nfs4_layoutget_call_ops,
6271                 .callback_data = lgp,
6272                 .flags = RPC_TASK_ASYNC,
6273         };
6274         struct pnfs_layout_segment *lseg = NULL;
6275         int status = 0;
6276
6277         dprintk("--> %s\n", __func__);
6278
6279         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6280         if (!lgp->args.layout.pages) {
6281                 nfs4_layoutget_release(lgp);
6282                 return ERR_PTR(-ENOMEM);
6283         }
6284         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6285         lgp->args.timestamp = jiffies;
6286
6287         lgp->res.layoutp = &lgp->args.layout;
6288         lgp->res.seq_res.sr_slot = NULL;
6289         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6290
6291         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6292         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6293
6294         task = rpc_run_task(&task_setup_data);
6295         if (IS_ERR(task))
6296                 return ERR_CAST(task);
6297         status = nfs4_wait_for_completion_rpc_task(task);
6298         if (status == 0)
6299                 status = task->tk_status;
6300         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6301         if (status == 0 && lgp->res.layoutp->len)
6302                 lseg = pnfs_layout_process(lgp);
6303         rpc_put_task(task);
6304         dprintk("<-- %s status=%d\n", __func__, status);
6305         if (status)
6306                 return ERR_PTR(status);
6307         return lseg;
6308 }
6309
6310 static void
6311 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6312 {
6313         struct nfs4_layoutreturn *lrp = calldata;
6314
6315         dprintk("--> %s\n", __func__);
6316         nfs41_setup_sequence(lrp->clp->cl_session,
6317                         &lrp->args.seq_args,
6318                         &lrp->res.seq_res,
6319                         task);
6320 }
6321
6322 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6323 {
6324         struct nfs4_layoutreturn *lrp = calldata;
6325         struct nfs_server *server;
6326
6327         dprintk("--> %s\n", __func__);
6328
6329         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6330                 return;
6331
6332         server = NFS_SERVER(lrp->args.inode);
6333         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6334                 rpc_restart_call_prepare(task);
6335                 return;
6336         }
6337         dprintk("<-- %s\n", __func__);
6338 }
6339
6340 static void nfs4_layoutreturn_release(void *calldata)
6341 {
6342         struct nfs4_layoutreturn *lrp = calldata;
6343         struct pnfs_layout_hdr *lo = lrp->args.layout;
6344
6345         dprintk("--> %s\n", __func__);
6346         spin_lock(&lo->plh_inode->i_lock);
6347         if (lrp->res.lrs_present)
6348                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6349         lo->plh_block_lgets--;
6350         spin_unlock(&lo->plh_inode->i_lock);
6351         pnfs_put_layout_hdr(lrp->args.layout);
6352         kfree(calldata);
6353         dprintk("<-- %s\n", __func__);
6354 }
6355
6356 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6357         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6358         .rpc_call_done = nfs4_layoutreturn_done,
6359         .rpc_release = nfs4_layoutreturn_release,
6360 };
6361
6362 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6363 {
6364         struct rpc_task *task;
6365         struct rpc_message msg = {
6366                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6367                 .rpc_argp = &lrp->args,
6368                 .rpc_resp = &lrp->res,
6369         };
6370         struct rpc_task_setup task_setup_data = {
6371                 .rpc_client = lrp->clp->cl_rpcclient,
6372                 .rpc_message = &msg,
6373                 .callback_ops = &nfs4_layoutreturn_call_ops,
6374                 .callback_data = lrp,
6375         };
6376         int status;
6377
6378         dprintk("--> %s\n", __func__);
6379         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6380         task = rpc_run_task(&task_setup_data);
6381         if (IS_ERR(task))
6382                 return PTR_ERR(task);
6383         status = task->tk_status;
6384         dprintk("<-- %s status=%d\n", __func__, status);
6385         rpc_put_task(task);
6386         return status;
6387 }
6388
6389 /*
6390  * Retrieve the list of Data Server devices from the MDS.
6391  */
6392 static int _nfs4_getdevicelist(struct nfs_server *server,
6393                                     const struct nfs_fh *fh,
6394                                     struct pnfs_devicelist *devlist)
6395 {
6396         struct nfs4_getdevicelist_args args = {
6397                 .fh = fh,
6398                 .layoutclass = server->pnfs_curr_ld->id,
6399         };
6400         struct nfs4_getdevicelist_res res = {
6401                 .devlist = devlist,
6402         };
6403         struct rpc_message msg = {
6404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6405                 .rpc_argp = &args,
6406                 .rpc_resp = &res,
6407         };
6408         int status;
6409
6410         dprintk("--> %s\n", __func__);
6411         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6412                                 &res.seq_res, 0);
6413         dprintk("<-- %s status=%d\n", __func__, status);
6414         return status;
6415 }
6416
6417 int nfs4_proc_getdevicelist(struct nfs_server *server,
6418                             const struct nfs_fh *fh,
6419                             struct pnfs_devicelist *devlist)
6420 {
6421         struct nfs4_exception exception = { };
6422         int err;
6423
6424         do {
6425                 err = nfs4_handle_exception(server,
6426                                 _nfs4_getdevicelist(server, fh, devlist),
6427                                 &exception);
6428         } while (exception.retry);
6429
6430         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6431                 err, devlist->num_devs);
6432
6433         return err;
6434 }
6435 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6436
6437 static int
6438 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6439 {
6440         struct nfs4_getdeviceinfo_args args = {
6441                 .pdev = pdev,
6442         };
6443         struct nfs4_getdeviceinfo_res res = {
6444                 .pdev = pdev,
6445         };
6446         struct rpc_message msg = {
6447                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6448                 .rpc_argp = &args,
6449                 .rpc_resp = &res,
6450         };
6451         int status;
6452
6453         dprintk("--> %s\n", __func__);
6454         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6455         dprintk("<-- %s status=%d\n", __func__, status);
6456
6457         return status;
6458 }
6459
6460 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6461 {
6462         struct nfs4_exception exception = { };
6463         int err;
6464
6465         do {
6466                 err = nfs4_handle_exception(server,
6467                                         _nfs4_proc_getdeviceinfo(server, pdev),
6468                                         &exception);
6469         } while (exception.retry);
6470         return err;
6471 }
6472 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6473
6474 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6475 {
6476         struct nfs4_layoutcommit_data *data = calldata;
6477         struct nfs_server *server = NFS_SERVER(data->args.inode);
6478         struct nfs4_session *session = nfs4_get_session(server);
6479
6480         nfs41_setup_sequence(session,
6481                         &data->args.seq_args,
6482                         &data->res.seq_res,
6483                         task);
6484 }
6485
6486 static void
6487 nfs4_layoutcommit_done(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
6492         if (!nfs41_sequence_done(task, &data->res.seq_res))
6493                 return;
6494
6495         switch (task->tk_status) { /* Just ignore these failures */
6496         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6497         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6498         case -NFS4ERR_BADLAYOUT:     /* no layout */
6499         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6500                 task->tk_status = 0;
6501                 break;
6502         case 0:
6503                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6504                                                    data->res.fattr);
6505                 break;
6506         default:
6507                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6508                         rpc_restart_call_prepare(task);
6509                         return;
6510                 }
6511         }
6512 }
6513
6514 static void nfs4_layoutcommit_release(void *calldata)
6515 {
6516         struct nfs4_layoutcommit_data *data = calldata;
6517
6518         pnfs_cleanup_layoutcommit(data);
6519         put_rpccred(data->cred);
6520         kfree(data);
6521 }
6522
6523 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6524         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6525         .rpc_call_done = nfs4_layoutcommit_done,
6526         .rpc_release = nfs4_layoutcommit_release,
6527 };
6528
6529 int
6530 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6531 {
6532         struct rpc_message msg = {
6533                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6534                 .rpc_argp = &data->args,
6535                 .rpc_resp = &data->res,
6536                 .rpc_cred = data->cred,
6537         };
6538         struct rpc_task_setup task_setup_data = {
6539                 .task = &data->task,
6540                 .rpc_client = NFS_CLIENT(data->args.inode),
6541                 .rpc_message = &msg,
6542                 .callback_ops = &nfs4_layoutcommit_ops,
6543                 .callback_data = data,
6544                 .flags = RPC_TASK_ASYNC,
6545         };
6546         struct rpc_task *task;
6547         int status = 0;
6548
6549         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6550                 "lbw: %llu inode %lu\n",
6551                 data->task.tk_pid, sync,
6552                 data->args.lastbytewritten,
6553                 data->args.inode->i_ino);
6554
6555         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6556         task = rpc_run_task(&task_setup_data);
6557         if (IS_ERR(task))
6558                 return PTR_ERR(task);
6559         if (sync == false)
6560                 goto out;
6561         status = nfs4_wait_for_completion_rpc_task(task);
6562         if (status != 0)
6563                 goto out;
6564         status = task->tk_status;
6565 out:
6566         dprintk("%s: status %d\n", __func__, status);
6567         rpc_put_task(task);
6568         return status;
6569 }
6570
6571 static int
6572 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6573                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6574 {
6575         struct nfs41_secinfo_no_name_args args = {
6576                 .style = SECINFO_STYLE_CURRENT_FH,
6577         };
6578         struct nfs4_secinfo_res res = {
6579                 .flavors = flavors,
6580         };
6581         struct rpc_message msg = {
6582                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6583                 .rpc_argp = &args,
6584                 .rpc_resp = &res,
6585         };
6586         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6587 }
6588
6589 static int
6590 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6591                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6592 {
6593         struct nfs4_exception exception = { };
6594         int err;
6595         do {
6596                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6597                 switch (err) {
6598                 case 0:
6599                 case -NFS4ERR_WRONGSEC:
6600                 case -NFS4ERR_NOTSUPP:
6601                         goto out;
6602                 default:
6603                         err = nfs4_handle_exception(server, err, &exception);
6604                 }
6605         } while (exception.retry);
6606 out:
6607         return err;
6608 }
6609
6610 static int
6611 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6612                     struct nfs_fsinfo *info)
6613 {
6614         int err;
6615         struct page *page;
6616         rpc_authflavor_t flavor;
6617         struct nfs4_secinfo_flavors *flavors;
6618
6619         page = alloc_page(GFP_KERNEL);
6620         if (!page) {
6621                 err = -ENOMEM;
6622                 goto out;
6623         }
6624
6625         flavors = page_address(page);
6626         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6627
6628         /*
6629          * Fall back on "guess and check" method if
6630          * the server doesn't support SECINFO_NO_NAME
6631          */
6632         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6633                 err = nfs4_find_root_sec(server, fhandle, info);
6634                 goto out_freepage;
6635         }
6636         if (err)
6637                 goto out_freepage;
6638
6639         flavor = nfs_find_best_sec(flavors);
6640         if (err == 0)
6641                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6642
6643 out_freepage:
6644         put_page(page);
6645         if (err == -EACCES)
6646                 return -EPERM;
6647 out:
6648         return err;
6649 }
6650
6651 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6652 {
6653         int status;
6654         struct nfs41_test_stateid_args args = {
6655                 .stateid = stateid,
6656         };
6657         struct nfs41_test_stateid_res res;
6658         struct rpc_message msg = {
6659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6660                 .rpc_argp = &args,
6661                 .rpc_resp = &res,
6662         };
6663
6664         dprintk("NFS call  test_stateid %p\n", stateid);
6665         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6666         nfs4_set_sequence_privileged(&args.seq_args);
6667         status = nfs4_call_sync_sequence(server->client, server, &msg,
6668                         &args.seq_args, &res.seq_res);
6669         if (status != NFS_OK) {
6670                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6671                 return status;
6672         }
6673         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6674         return -res.status;
6675 }
6676
6677 /**
6678  * nfs41_test_stateid - perform a TEST_STATEID operation
6679  *
6680  * @server: server / transport on which to perform the operation
6681  * @stateid: state ID to test
6682  *
6683  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6684  * Otherwise a negative NFS4ERR value is returned if the operation
6685  * failed or the state ID is not currently valid.
6686  */
6687 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6688 {
6689         struct nfs4_exception exception = { };
6690         int err;
6691         do {
6692                 err = _nfs41_test_stateid(server, stateid);
6693                 if (err != -NFS4ERR_DELAY)
6694                         break;
6695                 nfs4_handle_exception(server, err, &exception);
6696         } while (exception.retry);
6697         return err;
6698 }
6699
6700 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6701 {
6702         struct nfs41_free_stateid_args args = {
6703                 .stateid = stateid,
6704         };
6705         struct nfs41_free_stateid_res res;
6706         struct rpc_message msg = {
6707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6708                 .rpc_argp = &args,
6709                 .rpc_resp = &res,
6710         };
6711         int status;
6712
6713         dprintk("NFS call  free_stateid %p\n", stateid);
6714         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6715         nfs4_set_sequence_privileged(&args.seq_args);
6716         status = nfs4_call_sync_sequence(server->client, server, &msg,
6717                         &args.seq_args, &res.seq_res);
6718         dprintk("NFS reply free_stateid: %d\n", status);
6719         return status;
6720 }
6721
6722 /**
6723  * nfs41_free_stateid - perform a FREE_STATEID operation
6724  *
6725  * @server: server / transport on which to perform the operation
6726  * @stateid: state ID to release
6727  *
6728  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6729  * negative NFS4ERR value is returned.
6730  */
6731 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6732 {
6733         struct nfs4_exception exception = { };
6734         int err;
6735         do {
6736                 err = _nfs4_free_stateid(server, stateid);
6737                 if (err != -NFS4ERR_DELAY)
6738                         break;
6739                 nfs4_handle_exception(server, err, &exception);
6740         } while (exception.retry);
6741         return err;
6742 }
6743
6744 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6745                 const nfs4_stateid *s2)
6746 {
6747         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6748                 return false;
6749
6750         if (s1->seqid == s2->seqid)
6751                 return true;
6752         if (s1->seqid == 0 || s2->seqid == 0)
6753                 return true;
6754
6755         return false;
6756 }
6757
6758 #endif /* CONFIG_NFS_V4_1 */
6759
6760 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6761                 const nfs4_stateid *s2)
6762 {
6763         return nfs4_stateid_match(s1, s2);
6764 }
6765
6766
6767 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6768         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6769         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6770         .recover_open   = nfs4_open_reclaim,
6771         .recover_lock   = nfs4_lock_reclaim,
6772         .establish_clid = nfs4_init_clientid,
6773         .get_clid_cred  = nfs4_get_setclientid_cred,
6774         .detect_trunking = nfs40_discover_server_trunking,
6775 };
6776
6777 #if defined(CONFIG_NFS_V4_1)
6778 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6779         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6780         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6781         .recover_open   = nfs4_open_reclaim,
6782         .recover_lock   = nfs4_lock_reclaim,
6783         .establish_clid = nfs41_init_clientid,
6784         .get_clid_cred  = nfs4_get_exchange_id_cred,
6785         .reclaim_complete = nfs41_proc_reclaim_complete,
6786         .detect_trunking = nfs41_discover_server_trunking,
6787 };
6788 #endif /* CONFIG_NFS_V4_1 */
6789
6790 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6791         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6792         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6793         .recover_open   = nfs4_open_expired,
6794         .recover_lock   = nfs4_lock_expired,
6795         .establish_clid = nfs4_init_clientid,
6796         .get_clid_cred  = nfs4_get_setclientid_cred,
6797 };
6798
6799 #if defined(CONFIG_NFS_V4_1)
6800 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6801         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6802         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6803         .recover_open   = nfs41_open_expired,
6804         .recover_lock   = nfs41_lock_expired,
6805         .establish_clid = nfs41_init_clientid,
6806         .get_clid_cred  = nfs4_get_exchange_id_cred,
6807 };
6808 #endif /* CONFIG_NFS_V4_1 */
6809
6810 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6811         .sched_state_renewal = nfs4_proc_async_renew,
6812         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6813         .renew_lease = nfs4_proc_renew,
6814 };
6815
6816 #if defined(CONFIG_NFS_V4_1)
6817 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6818         .sched_state_renewal = nfs41_proc_async_sequence,
6819         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6820         .renew_lease = nfs4_proc_sequence,
6821 };
6822 #endif
6823
6824 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6825         .minor_version = 0,
6826         .init_caps = NFS_CAP_READDIRPLUS
6827                 | NFS_CAP_ATOMIC_OPEN
6828                 | NFS_CAP_CHANGE_ATTR
6829                 | NFS_CAP_POSIX_LOCK,
6830         .call_sync = _nfs4_call_sync,
6831         .match_stateid = nfs4_match_stateid,
6832         .find_root_sec = nfs4_find_root_sec,
6833         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6834         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6835         .state_renewal_ops = &nfs40_state_renewal_ops,
6836 };
6837
6838 #if defined(CONFIG_NFS_V4_1)
6839 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6840         .minor_version = 1,
6841         .init_caps = NFS_CAP_READDIRPLUS
6842                 | NFS_CAP_ATOMIC_OPEN
6843                 | NFS_CAP_CHANGE_ATTR
6844                 | NFS_CAP_POSIX_LOCK,
6845         .call_sync = nfs4_call_sync_sequence,
6846         .match_stateid = nfs41_match_stateid,
6847         .find_root_sec = nfs41_find_root_sec,
6848         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6849         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6850         .state_renewal_ops = &nfs41_state_renewal_ops,
6851 };
6852 #endif
6853
6854 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6855         [0] = &nfs_v4_0_minor_ops,
6856 #if defined(CONFIG_NFS_V4_1)
6857         [1] = &nfs_v4_1_minor_ops,
6858 #endif
6859 };
6860
6861 const struct inode_operations nfs4_dir_inode_operations = {
6862         .create         = nfs_create,
6863         .lookup         = nfs_lookup,
6864         .atomic_open    = nfs_atomic_open,
6865         .link           = nfs_link,
6866         .unlink         = nfs_unlink,
6867         .symlink        = nfs_symlink,
6868         .mkdir          = nfs_mkdir,
6869         .rmdir          = nfs_rmdir,
6870         .mknod          = nfs_mknod,
6871         .rename         = nfs_rename,
6872         .permission     = nfs_permission,
6873         .getattr        = nfs_getattr,
6874         .setattr        = nfs_setattr,
6875         .getxattr       = generic_getxattr,
6876         .setxattr       = generic_setxattr,
6877         .listxattr      = generic_listxattr,
6878         .removexattr    = generic_removexattr,
6879 };
6880
6881 static const struct inode_operations nfs4_file_inode_operations = {
6882         .permission     = nfs_permission,
6883         .getattr        = nfs_getattr,
6884         .setattr        = nfs_setattr,
6885         .getxattr       = generic_getxattr,
6886         .setxattr       = generic_setxattr,
6887         .listxattr      = generic_listxattr,
6888         .removexattr    = generic_removexattr,
6889 };
6890
6891 const struct nfs_rpc_ops nfs_v4_clientops = {
6892         .version        = 4,                    /* protocol version */
6893         .dentry_ops     = &nfs4_dentry_operations,
6894         .dir_inode_ops  = &nfs4_dir_inode_operations,
6895         .file_inode_ops = &nfs4_file_inode_operations,
6896         .file_ops       = &nfs4_file_operations,
6897         .getroot        = nfs4_proc_get_root,
6898         .submount       = nfs4_submount,
6899         .try_mount      = nfs4_try_mount,
6900         .getattr        = nfs4_proc_getattr,
6901         .setattr        = nfs4_proc_setattr,
6902         .lookup         = nfs4_proc_lookup,
6903         .access         = nfs4_proc_access,
6904         .readlink       = nfs4_proc_readlink,
6905         .create         = nfs4_proc_create,
6906         .remove         = nfs4_proc_remove,
6907         .unlink_setup   = nfs4_proc_unlink_setup,
6908         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6909         .unlink_done    = nfs4_proc_unlink_done,
6910         .rename         = nfs4_proc_rename,
6911         .rename_setup   = nfs4_proc_rename_setup,
6912         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6913         .rename_done    = nfs4_proc_rename_done,
6914         .link           = nfs4_proc_link,
6915         .symlink        = nfs4_proc_symlink,
6916         .mkdir          = nfs4_proc_mkdir,
6917         .rmdir          = nfs4_proc_remove,
6918         .readdir        = nfs4_proc_readdir,
6919         .mknod          = nfs4_proc_mknod,
6920         .statfs         = nfs4_proc_statfs,
6921         .fsinfo         = nfs4_proc_fsinfo,
6922         .pathconf       = nfs4_proc_pathconf,
6923         .set_capabilities = nfs4_server_capabilities,
6924         .decode_dirent  = nfs4_decode_dirent,
6925         .read_setup     = nfs4_proc_read_setup,
6926         .read_pageio_init = pnfs_pageio_init_read,
6927         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6928         .read_done      = nfs4_read_done,
6929         .write_setup    = nfs4_proc_write_setup,
6930         .write_pageio_init = pnfs_pageio_init_write,
6931         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6932         .write_done     = nfs4_write_done,
6933         .commit_setup   = nfs4_proc_commit_setup,
6934         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6935         .commit_done    = nfs4_commit_done,
6936         .lock           = nfs4_proc_lock,
6937         .clear_acl_cache = nfs4_zap_acl_attr,
6938         .close_context  = nfs4_close_context,
6939         .open_context   = nfs4_atomic_open,
6940         .have_delegation = nfs4_have_delegation,
6941         .return_delegation = nfs4_inode_return_delegation,
6942         .alloc_client   = nfs4_alloc_client,
6943         .init_client    = nfs4_init_client,
6944         .free_client    = nfs4_free_client,
6945         .create_server  = nfs4_create_server,
6946         .clone_server   = nfs_clone_server,
6947 };
6948
6949 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6950         .prefix = XATTR_NAME_NFSV4_ACL,
6951         .list   = nfs4_xattr_list_nfs4_acl,
6952         .get    = nfs4_xattr_get_nfs4_acl,
6953         .set    = nfs4_xattr_set_nfs4_acl,
6954 };
6955
6956 const struct xattr_handler *nfs4_xattr_handlers[] = {
6957         &nfs4_xattr_nfs4_acl_handler,
6958         NULL
6959 };
6960
6961 /*
6962  * Local variables:
6963  *  c-basic-offset: 8
6964  * End:
6965  */