fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state);
  85 #ifdef CONFIG_NFS_V4_1
  86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  88 #endif
  89 /* Prevent leaks of NFSv4 errors into userland */
  90 static int nfs4_map_errors(int err)
  91 {
  92         if (err >= -1000)
  93                 return err;
  94         switch (err) {
  95         case -NFS4ERR_RESOURCE:
  96         case -NFS4ERR_LAYOUTTRYLATER:
  97         case -NFS4ERR_RECALLCONFLICT:
  98                 return -EREMOTEIO;
  99         case -NFS4ERR_WRONGSEC:
 100                 return -EPERM;
 101         case -NFS4ERR_BADOWNER:
 102         case -NFS4ERR_BADNAME:
 103                 return -EINVAL;
 104         case -NFS4ERR_SHARE_DENIED:
 105                 return -EACCES;
 106         case -NFS4ERR_MINOR_VERS_MISMATCH:
 107                 return -EPROTONOSUPPORT;
 108         case -NFS4ERR_ACCESS:
 109                 return -EACCES;
 110         case -NFS4ERR_FILE_OPEN:
 111                 return -EBUSY;
 112         default:
 113                 dprintk("%s could not handle NFSv4 error %d\n",
 114                                 __func__, -err);
 115                 break;
 116         }
 117         return -EIO;
 118 }
 119
 120 /*
 121  * This is our standard bitmap for GETATTR requests.
 122  */
 123 const u32 nfs4_fattr_bitmap[3] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138 };
 139
 140 static const u32 nfs4_pnfs_open_bitmap[3] = {
 141         FATTR4_WORD0_TYPE
 142         | FATTR4_WORD0_CHANGE
 143         | FATTR4_WORD0_SIZE
 144         | FATTR4_WORD0_FSID
 145         | FATTR4_WORD0_FILEID,
 146         FATTR4_WORD1_MODE
 147         | FATTR4_WORD1_NUMLINKS
 148         | FATTR4_WORD1_OWNER
 149         | FATTR4_WORD1_OWNER_GROUP
 150         | FATTR4_WORD1_RAWDEV
 151         | FATTR4_WORD1_SPACE_USED
 152         | FATTR4_WORD1_TIME_ACCESS
 153         | FATTR4_WORD1_TIME_METADATA
 154         | FATTR4_WORD1_TIME_MODIFY,
 155         FATTR4_WORD2_MDSTHRESHOLD
 156 };
 157
 158 static const u32 nfs4_open_noattr_bitmap[3] = {
 159         FATTR4_WORD0_TYPE
 160         | FATTR4_WORD0_CHANGE
 161         | FATTR4_WORD0_FILEID,
 162 };
 163
 164 const u32 nfs4_statfs_bitmap[2] = {
 165         FATTR4_WORD0_FILES_AVAIL
 166         | FATTR4_WORD0_FILES_FREE
 167         | FATTR4_WORD0_FILES_TOTAL,
 168         FATTR4_WORD1_SPACE_AVAIL
 169         | FATTR4_WORD1_SPACE_FREE
 170         | FATTR4_WORD1_SPACE_TOTAL
 171 };
 172
 173 const u32 nfs4_pathconf_bitmap[2] = {
 174         FATTR4_WORD0_MAXLINK
 175         | FATTR4_WORD0_MAXNAME,
 176         0
 177 };
 178
 179 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 180                         | FATTR4_WORD0_MAXREAD
 181                         | FATTR4_WORD0_MAXWRITE
 182                         | FATTR4_WORD0_LEASE_TIME,
 183                         FATTR4_WORD1_TIME_DELTA
 184                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 185                         FATTR4_WORD2_LAYOUT_BLKSIZE
 186 };
 187
 188 const u32 nfs4_fs_locations_bitmap[2] = {
 189         FATTR4_WORD0_TYPE
 190         | FATTR4_WORD0_CHANGE
 191         | FATTR4_WORD0_SIZE
 192         | FATTR4_WORD0_FSID
 193         | FATTR4_WORD0_FILEID
 194         | FATTR4_WORD0_FS_LOCATIONS,
 195         FATTR4_WORD1_MODE
 196         | FATTR4_WORD1_NUMLINKS
 197         | FATTR4_WORD1_OWNER
 198         | FATTR4_WORD1_OWNER_GROUP
 199         | FATTR4_WORD1_RAWDEV
 200         | FATTR4_WORD1_SPACE_USED
 201         | FATTR4_WORD1_TIME_ACCESS
 202         | FATTR4_WORD1_TIME_METADATA
 203         | FATTR4_WORD1_TIME_MODIFY
 204         | FATTR4_WORD1_MOUNTED_ON_FILEID
 205 };
 206
 207 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 208                 struct nfs4_readdir_arg *readdir)
 209 {
 210         __be32 *start, *p;
 211
 212         if (cookie > 2) {
 213                 readdir->cookie = cookie;
 214                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 215                 return;
 216         }
 217
 218         readdir->cookie = 0;
 219         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 220         if (cookie == 2)
 221                 return;
 222
 223         /*
 224          * NFSv4 servers do not return entries for '.' and '..'
 225          * Therefore, we fake these entries here.  We let '.'
 226          * have cookie 0 and '..' have cookie 1.  Note that
 227          * when talking to the server, we always send cookie 0
 228          * instead of 1 or 2.
 229          */
 230         start = p = kmap_atomic(*readdir->pages);
 231
 232         if (cookie == 0) {
 233                 *p++ = xdr_one;                                  /* next */
 234                 *p++ = xdr_zero;                   /* cookie, first word */
 235                 *p++ = xdr_one;                   /* cookie, second word */
 236                 *p++ = xdr_one;                             /* entry len */
 237                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 238                 p++;
 239                 *p++ = xdr_one;                         /* bitmap length */
 240                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 241                 *p++ = htonl(8);              /* attribute buffer length */
 242                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 243         }
 244
 245         *p++ = xdr_one;                                  /* next */
 246         *p++ = xdr_zero;                   /* cookie, first word */
 247         *p++ = xdr_two;                   /* cookie, second word */
 248         *p++ = xdr_two;                             /* entry len */
 249         memcpy(p, "..\0\0", 4);                         /* entry */
 250         p++;
 251         *p++ = xdr_one;                         /* bitmap length */
 252         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 253         *p++ = htonl(8);              /* attribute buffer length */
 254         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 255
 256         readdir->pgbase = (char *)p - (char *)start;
 257         readdir->count -= readdir->pgbase;
 258         kunmap_atomic(start);
 259 }
 260
 261 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 262 {
 263         int res = 0;
 264
 265         might_sleep();
 266
 267         if (*timeout <= 0)
 268                 *timeout = NFS4_POLL_RETRY_MIN;
 269         if (*timeout > NFS4_POLL_RETRY_MAX)
 270                 *timeout = NFS4_POLL_RETRY_MAX;
 271         freezable_schedule_timeout_killable(*timeout);
 272         if (fatal_signal_pending(current))
 273                 res = -ERESTARTSYS;
 274         *timeout <<= 1;
 275         return res;
 276 }
 277
 278 /* This is the error handling routine for processes that are allowed
 279  * to sleep.
 280  */
 281 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 282 {
 283         struct nfs_client *clp = server->nfs_client;
 284         struct nfs4_state *state = exception->state;
 285         struct inode *inode = exception->inode;
 286         int ret = errorcode;
 287
 288         exception->retry = 0;
 289         switch(errorcode) {
 290                 case 0:
 291                         return 0;
 292                 case -NFS4ERR_OPENMODE:
 293                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 294                                 nfs4_inode_return_delegation(inode);
 295                                 exception->retry = 1;
 296                                 return 0;
 297                         }
 298                         if (state == NULL)
 299                                 break;
 300                         ret = nfs4_schedule_stateid_recovery(server, state);
 301                         if (ret < 0)
 302                                 break;
 303                         goto wait_on_recovery;
 304                 case -NFS4ERR_DELEG_REVOKED:
 305                 case -NFS4ERR_ADMIN_REVOKED:
 306                 case -NFS4ERR_BAD_STATEID:
 307                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 308                                 nfs_remove_bad_delegation(inode);
 309                                 exception->retry = 1;
 310                                 break;
 311                         }
 312                         if (state == NULL)
 313                                 break;
 314                         ret = nfs4_schedule_stateid_recovery(server, state);
 315                         if (ret < 0)
 316                                 break;
 317                         goto wait_on_recovery;
 318                 case -NFS4ERR_EXPIRED:
 319                         if (state != NULL) {
 320                                 ret = nfs4_schedule_stateid_recovery(server, state);
 321                                 if (ret < 0)
 322                                         break;
 323                         }
 324                 case -NFS4ERR_STALE_STATEID:
 325                 case -NFS4ERR_STALE_CLIENTID:
 326                         nfs4_schedule_lease_recovery(clp);
 327                         goto wait_on_recovery;
 328 #if defined(CONFIG_NFS_V4_1)
 329                 case -NFS4ERR_BADSESSION:
 330                 case -NFS4ERR_BADSLOT:
 331                 case -NFS4ERR_BAD_HIGH_SLOT:
 332                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 333                 case -NFS4ERR_DEADSESSION:
 334                 case -NFS4ERR_SEQ_FALSE_RETRY:
 335                 case -NFS4ERR_SEQ_MISORDERED:
 336                         dprintk("%s ERROR: %d Reset session\n", __func__,
 337                                 errorcode);
 338                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 339                         goto wait_on_recovery;
 340 #endif /* defined(CONFIG_NFS_V4_1) */
 341                 case -NFS4ERR_FILE_OPEN:
 342                         if (exception->timeout > HZ) {
 343                                 /* We have retried a decent amount, time to
 344                                  * fail
 345                                  */
 346                                 ret = -EBUSY;
 347                                 break;
 348                         }
 349                 case -NFS4ERR_GRACE:
 350                 case -NFS4ERR_DELAY:
 351                         ret = nfs4_delay(server->client, &exception->timeout);
 352                         if (ret != 0)
 353                                 break;
 354                 case -NFS4ERR_RETRY_UNCACHED_REP:
 355                 case -NFS4ERR_OLD_STATEID:
 356                         exception->retry = 1;
 357                         break;
 358                 case -NFS4ERR_BADOWNER:
 359                         /* The following works around a Linux server bug! */
 360                 case -NFS4ERR_BADNAME:
 361                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 362                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 363                                 exception->retry = 1;
 364                                 printk(KERN_WARNING "NFS: v4 server %s "
 365                                                 "does not accept raw "
 366                                                 "uid/gids. "
 367                                                 "Reenabling the idmapper.\n",
 368                                                 server->nfs_client->cl_hostname);
 369                         }
 370         }
 371         /* We failed to handle the error */
 372         return nfs4_map_errors(ret);
 373 wait_on_recovery:
 374         ret = nfs4_wait_clnt_recover(clp);
 375         if (ret == 0)
 376                 exception->retry = 1;
 377         return ret;
 378 }
 379
 380
 381 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 382 {
 383         spin_lock(&clp->cl_lock);
 384         if (time_before(clp->cl_last_renewal,timestamp))
 385                 clp->cl_last_renewal = timestamp;
 386         spin_unlock(&clp->cl_lock);
 387 }
 388
 389 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 390 {
 391         do_renew_lease(server->nfs_client, timestamp);
 392 }
 393
 394 #if defined(CONFIG_NFS_V4_1)
 395
 396 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 397 {
 398         struct nfs4_session *session;
 399         struct nfs4_slot_table *tbl;
 400         bool send_new_highest_used_slotid = false;
 401
 402         if (!res->sr_slot) {
 403                 /* just wake up the next guy waiting since
 404                  * we may have not consumed a slot after all */
 405                 dprintk("%s: No slot\n", __func__);
 406                 return;
 407         }
 408         tbl = res->sr_slot->table;
 409         session = tbl->session;
 410
 411         spin_lock(&tbl->slot_tbl_lock);
 412         /* Be nice to the server: try to ensure that the last transmitted
 413          * value for highest_user_slotid <= target_highest_slotid
 414          */
 415         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 416                 send_new_highest_used_slotid = true;
 417
 418         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 419                 send_new_highest_used_slotid = false;
 420                 goto out_unlock;
 421         }
 422         nfs4_free_slot(tbl, res->sr_slot);
 423
 424         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 425                 send_new_highest_used_slotid = false;
 426 out_unlock:
 427         spin_unlock(&tbl->slot_tbl_lock);
 428         res->sr_slot = NULL;
 429         if (send_new_highest_used_slotid)
 430                 nfs41_server_notify_highest_slotid_update(session->clp);
 431 }
 432
 433 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 434 {
 435         struct nfs4_session *session;
 436         struct nfs4_slot *slot;
 437         struct nfs_client *clp;
 438         bool interrupted = false;
 439         int ret = 1;
 440
 441         /* don't increment the sequence number if the task wasn't sent */
 442         if (!RPC_WAS_SENT(task))
 443                 goto out;
 444
 445         slot = res->sr_slot;
 446         session = slot->table->session;
 447
 448         if (slot->interrupted) {
 449                 slot->interrupted = 0;
 450                 interrupted = true;
 451         }
 452
 453         /* Check the SEQUENCE operation status */
 454         switch (res->sr_status) {
 455         case 0:
 456                 /* Update the slot's sequence and clientid lease timer */
 457                 ++slot->seq_nr;
 458                 clp = session->clp;
 459                 do_renew_lease(clp, res->sr_timestamp);
 460                 /* Check sequence flags */
 461                 if (res->sr_status_flags != 0)
 462                         nfs4_schedule_lease_recovery(clp);
 463                 nfs41_update_target_slotid(slot->table, slot, res);
 464                 break;
 465         case 1:
 466                 /*
 467                  * sr_status remains 1 if an RPC level error occurred.
 468                  * The server may or may not have processed the sequence
 469                  * operation..
 470                  * Mark the slot as having hosted an interrupted RPC call.
 471                  */
 472                 slot->interrupted = 1;
 473                 goto out;
 474         case -NFS4ERR_DELAY:
 475                 /* The server detected a resend of the RPC call and
 476                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 477                  * of RFC5661.
 478                  */
 479                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 480                         __func__,
 481                         slot->slot_nr,
 482                         slot->seq_nr);
 483                 goto out_retry;
 484         case -NFS4ERR_BADSLOT:
 485                 /*
 486                  * The slot id we used was probably retired. Try again
 487                  * using a different slot id.
 488                  */
 489                 goto retry_nowait;
 490         case -NFS4ERR_SEQ_MISORDERED:
 491                 /*
 492                  * Was the last operation on this sequence interrupted?
 493                  * If so, retry after bumping the sequence number.
 494                  */
 495                 if (interrupted) {
 496                         ++slot->seq_nr;
 497                         goto retry_nowait;
 498                 }
 499                 /*
 500                  * Could this slot have been previously retired?
 501                  * If so, then the server may be expecting seq_nr = 1!
 502                  */
 503                 if (slot->seq_nr != 1) {
 504                         slot->seq_nr = 1;
 505                         goto retry_nowait;
 506                 }
 507                 break;
 508         case -NFS4ERR_SEQ_FALSE_RETRY:
 509                 ++slot->seq_nr;
 510                 goto retry_nowait;
 511         default:
 512                 /* Just update the slot sequence no. */
 513                 ++slot->seq_nr;
 514         }
 515 out:
 516         /* The session may be reset by one of the error handlers. */
 517         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 518         nfs41_sequence_free_slot(res);
 519         return ret;
 520 retry_nowait:
 521         if (rpc_restart_call_prepare(task)) {
 522                 task->tk_status = 0;
 523                 ret = 0;
 524         }
 525         goto out;
 526 out_retry:
 527         if (!rpc_restart_call(task))
 528                 goto out;
 529         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 530         return 0;
 531 }
 532
 533 static int nfs4_sequence_done(struct rpc_task *task,
 534                                struct nfs4_sequence_res *res)
 535 {
 536         if (res->sr_slot == NULL)
 537                 return 1;
 538         return nfs41_sequence_done(task, res);
 539 }
 540
 541 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 542                 struct nfs4_sequence_res *res, int cache_reply)
 543 {
 544         args->sa_slot = NULL;
 545         args->sa_cache_this = 0;
 546         args->sa_privileged = 0;
 547         if (cache_reply)
 548                 args->sa_cache_this = 1;
 549         res->sr_slot = NULL;
 550 }
 551
 552 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 553 {
 554         args->sa_privileged = 1;
 555 }
 556
 557 int nfs41_setup_sequence(struct nfs4_session *session,
 558                                 struct nfs4_sequence_args *args,
 559                                 struct nfs4_sequence_res *res,
 560                                 struct rpc_task *task)
 561 {
 562         struct nfs4_slot *slot;
 563         struct nfs4_slot_table *tbl;
 564
 565         dprintk("--> %s\n", __func__);
 566         /* slot already allocated? */
 567         if (res->sr_slot != NULL)
 568                 goto out_success;
 569
 570         tbl = &session->fc_slot_table;
 571
 572         task->tk_timeout = 0;
 573
 574         spin_lock(&tbl->slot_tbl_lock);
 575         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 576             !args->sa_privileged) {
 577                 /* The state manager will wait until the slot table is empty */
 578                 dprintk("%s session is draining\n", __func__);
 579                 goto out_sleep;
 580         }
 581
 582         slot = nfs4_alloc_slot(tbl);
 583         if (IS_ERR(slot)) {
 584                 /* If out of memory, try again in 1/4 second */
 585                 if (slot == ERR_PTR(-ENOMEM))
 586                         task->tk_timeout = HZ >> 2;
 587                 dprintk("<-- %s: no free slots\n", __func__);
 588                 goto out_sleep;
 589         }
 590         spin_unlock(&tbl->slot_tbl_lock);
 591
 592         args->sa_slot = slot;
 593
 594         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 595                         slot->slot_nr, slot->seq_nr);
 596
 597         res->sr_slot = slot;
 598         res->sr_timestamp = jiffies;
 599         res->sr_status_flags = 0;
 600         /*
 601          * sr_status is only set in decode_sequence, and so will remain
 602          * set to 1 if an rpc level failure occurs.
 603          */
 604         res->sr_status = 1;
 605 out_success:
 606         rpc_call_start(task);
 607         return 0;
 608 out_sleep:
 609         /* Privileged tasks are queued with top priority */
 610         if (args->sa_privileged)
 611                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 612                                 NULL, RPC_PRIORITY_PRIVILEGED);
 613         else
 614                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 615         spin_unlock(&tbl->slot_tbl_lock);
 616         return -EAGAIN;
 617 }
 618 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 619
 620 int nfs4_setup_sequence(const struct nfs_server *server,
 621                         struct nfs4_sequence_args *args,
 622                         struct nfs4_sequence_res *res,
 623                         struct rpc_task *task)
 624 {
 625         struct nfs4_session *session = nfs4_get_session(server);
 626         int ret = 0;
 627
 628         if (session == NULL) {
 629                 rpc_call_start(task);
 630                 goto out;
 631         }
 632
 633         dprintk("--> %s clp %p session %p sr_slot %d\n",
 634                 __func__, session->clp, session, res->sr_slot ?
 635                         res->sr_slot->slot_nr : -1);
 636
 637         ret = nfs41_setup_sequence(session, args, res, task);
 638 out:
 639         dprintk("<-- %s status=%d\n", __func__, ret);
 640         return ret;
 641 }
 642
 643 struct nfs41_call_sync_data {
 644         const struct nfs_server *seq_server;
 645         struct nfs4_sequence_args *seq_args;
 646         struct nfs4_sequence_res *seq_res;
 647 };
 648
 649 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 650 {
 651         struct nfs41_call_sync_data *data = calldata;
 652         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 653
 654         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 655
 656         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 657 }
 658
 659 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 660 {
 661         struct nfs41_call_sync_data *data = calldata;
 662
 663         nfs41_sequence_done(task, data->seq_res);
 664 }
 665
 666 static const struct rpc_call_ops nfs41_call_sync_ops = {
 667         .rpc_call_prepare = nfs41_call_sync_prepare,
 668         .rpc_call_done = nfs41_call_sync_done,
 669 };
 670
 671 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 672                                    struct nfs_server *server,
 673                                    struct rpc_message *msg,
 674                                    struct nfs4_sequence_args *args,
 675                                    struct nfs4_sequence_res *res)
 676 {
 677         int ret;
 678         struct rpc_task *task;
 679         struct nfs41_call_sync_data data = {
 680                 .seq_server = server,
 681                 .seq_args = args,
 682                 .seq_res = res,
 683         };
 684         struct rpc_task_setup task_setup = {
 685                 .rpc_client = clnt,
 686                 .rpc_message = msg,
 687                 .callback_ops = &nfs41_call_sync_ops,
 688                 .callback_data = &data
 689         };
 690
 691         task = rpc_run_task(&task_setup);
 692         if (IS_ERR(task))
 693                 ret = PTR_ERR(task);
 694         else {
 695                 ret = task->tk_status;
 696                 rpc_put_task(task);
 697         }
 698         return ret;
 699 }
 700
 701 #else
 702 static
 703 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 704                 struct nfs4_sequence_res *res, int cache_reply)
 705 {
 706 }
 707
 708 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 709 {
 710 }
 711
 712
 713 static int nfs4_sequence_done(struct rpc_task *task,
 714                                struct nfs4_sequence_res *res)
 715 {
 716         return 1;
 717 }
 718 #endif /* CONFIG_NFS_V4_1 */
 719
 720 static
 721 int _nfs4_call_sync(struct rpc_clnt *clnt,
 722                     struct nfs_server *server,
 723                     struct rpc_message *msg,
 724                     struct nfs4_sequence_args *args,
 725                     struct nfs4_sequence_res *res)
 726 {
 727         return rpc_call_sync(clnt, msg, 0);
 728 }
 729
 730 static
 731 int nfs4_call_sync(struct rpc_clnt *clnt,
 732                    struct nfs_server *server,
 733                    struct rpc_message *msg,
 734                    struct nfs4_sequence_args *args,
 735                    struct nfs4_sequence_res *res,
 736                    int cache_reply)
 737 {
 738         nfs41_init_sequence(args, res, cache_reply);
 739         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 740                                                 args, res);
 741 }
 742
 743 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 744 {
 745         struct nfs_inode *nfsi = NFS_I(dir);
 746
 747         spin_lock(&dir->i_lock);
 748         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 749         if (!cinfo->atomic || cinfo->before != dir->i_version)
 750                 nfs_force_lookup_revalidate(dir);
 751         dir->i_version = cinfo->after;
 752         nfs_fscache_invalidate(dir);
 753         spin_unlock(&dir->i_lock);
 754 }
 755
 756 struct nfs4_opendata {
 757         struct kref kref;
 758         struct nfs_openargs o_arg;
 759         struct nfs_openres o_res;
 760         struct nfs_open_confirmargs c_arg;
 761         struct nfs_open_confirmres c_res;
 762         struct nfs4_string owner_name;
 763         struct nfs4_string group_name;
 764         struct nfs_fattr f_attr;
 765         struct dentry *dir;
 766         struct dentry *dentry;
 767         struct nfs4_state_owner *owner;
 768         struct nfs4_state *state;
 769         struct iattr attrs;
 770         unsigned long timestamp;
 771         unsigned int rpc_done : 1;
 772         unsigned int is_recover : 1;
 773         int rpc_status;
 774         int cancelled;
 775 };
 776
 777 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 778                 int err, struct nfs4_exception *exception)
 779 {
 780         if (err != -EINVAL)
 781                 return false;
 782         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 783                 return false;
 784         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 785         exception->retry = 1;
 786         return true;
 787 }
 788
 789 static enum open_claim_type4
 790 nfs4_map_atomic_open_claim(struct nfs_server *server,
 791                 enum open_claim_type4 claim)
 792 {
 793         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 794                 return claim;
 795         switch (claim) {
 796         default:
 797                 return claim;
 798         case NFS4_OPEN_CLAIM_FH:
 799                 return NFS4_OPEN_CLAIM_NULL;
 800         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 801                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 802         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 803                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 804         }
 805 }
 806
 807 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 808 {
 809         p->o_res.f_attr = &p->f_attr;
 810         p->o_res.seqid = p->o_arg.seqid;
 811         p->c_res.seqid = p->c_arg.seqid;
 812         p->o_res.server = p->o_arg.server;
 813         p->o_res.access_request = p->o_arg.access;
 814         nfs_fattr_init(&p->f_attr);
 815         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 816 }
 817
 818 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 819                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 820                 const struct iattr *attrs,
 821                 enum open_claim_type4 claim,
 822                 gfp_t gfp_mask)
 823 {
 824         struct dentry *parent = dget_parent(dentry);
 825         struct inode *dir = parent->d_inode;
 826         struct nfs_server *server = NFS_SERVER(dir);
 827         struct nfs4_opendata *p;
 828
 829         p = kzalloc(sizeof(*p), gfp_mask);
 830         if (p == NULL)
 831                 goto err;
 832         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 833         if (p->o_arg.seqid == NULL)
 834                 goto err_free;
 835         nfs_sb_active(dentry->d_sb);
 836         p->dentry = dget(dentry);
 837         p->dir = parent;
 838         p->owner = sp;
 839         atomic_inc(&sp->so_count);
 840         p->o_arg.open_flags = flags;
 841         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 842         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 843          * will return permission denied for all bits until close */
 844         if (!(flags & O_EXCL)) {
 845                 /* ask server to check for all possible rights as results
 846                  * are cached */
 847                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 848                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 849         }
 850         p->o_arg.clientid = server->nfs_client->cl_clientid;
 851         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 852         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 853         p->o_arg.name = &dentry->d_name;
 854         p->o_arg.server = server;
 855         p->o_arg.bitmask = server->attr_bitmask;
 856         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 857         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
 858         switch (p->o_arg.claim) {
 859         case NFS4_OPEN_CLAIM_NULL:
 860         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 861         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 862                 p->o_arg.fh = NFS_FH(dir);
 863                 break;
 864         case NFS4_OPEN_CLAIM_PREVIOUS:
 865         case NFS4_OPEN_CLAIM_FH:
 866         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 867         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 868                 p->o_arg.fh = NFS_FH(dentry->d_inode);
 869         }
 870         if (attrs != NULL && attrs->ia_valid != 0) {
 871                 __be32 verf[2];
 872
 873                 p->o_arg.u.attrs = &p->attrs;
 874                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 875
 876                 verf[0] = jiffies;
 877                 verf[1] = current->pid;
 878                 memcpy(p->o_arg.u.verifier.data, verf,
 879                                 sizeof(p->o_arg.u.verifier.data));
 880         }
 881         p->c_arg.fh = &p->o_res.fh;
 882         p->c_arg.stateid = &p->o_res.stateid;
 883         p->c_arg.seqid = p->o_arg.seqid;
 884         nfs4_init_opendata_res(p);
 885         kref_init(&p->kref);
 886         return p;
 887 err_free:
 888         kfree(p);
 889 err:
 890         dput(parent);
 891         return NULL;
 892 }
 893
 894 static void nfs4_opendata_free(struct kref *kref)
 895 {
 896         struct nfs4_opendata *p = container_of(kref,
 897                         struct nfs4_opendata, kref);
 898         struct super_block *sb = p->dentry->d_sb;
 899
 900         nfs_free_seqid(p->o_arg.seqid);
 901         if (p->state != NULL)
 902                 nfs4_put_open_state(p->state);
 903         nfs4_put_state_owner(p->owner);
 904         dput(p->dir);
 905         dput(p->dentry);
 906         nfs_sb_deactive(sb);
 907         nfs_fattr_free_names(&p->f_attr);
 908         kfree(p);
 909 }
 910
 911 static void nfs4_opendata_put(struct nfs4_opendata *p)
 912 {
 913         if (p != NULL)
 914                 kref_put(&p->kref, nfs4_opendata_free);
 915 }
 916
 917 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 918 {
 919         int ret;
 920
 921         ret = rpc_wait_for_completion_task(task);
 922         return ret;
 923 }
 924
 925 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 926 {
 927         int ret = 0;
 928
 929         if (open_mode & (O_EXCL|O_TRUNC))
 930                 goto out;
 931         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 932                 case FMODE_READ:
 933                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 934                                 && state->n_rdonly != 0;
 935                         break;
 936                 case FMODE_WRITE:
 937                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 938                                 && state->n_wronly != 0;
 939                         break;
 940                 case FMODE_READ|FMODE_WRITE:
 941                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 942                                 && state->n_rdwr != 0;
 943         }
 944 out:
 945         return ret;
 946 }
 947
 948 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 949 {
 950         if (delegation == NULL)
 951                 return 0;
 952         if ((delegation->type & fmode) != fmode)
 953                 return 0;
 954         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 955                 return 0;
 956         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
 957                 return 0;
 958         nfs_mark_delegation_referenced(delegation);
 959         return 1;
 960 }
 961
 962 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 963 {
 964         switch (fmode) {
 965                 case FMODE_WRITE:
 966                         state->n_wronly++;
 967                         break;
 968                 case FMODE_READ:
 969                         state->n_rdonly++;
 970                         break;
 971                 case FMODE_READ|FMODE_WRITE:
 972                         state->n_rdwr++;
 973         }
 974         nfs4_state_set_mode_locked(state, state->state | fmode);
 975 }
 976
 977 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 978 {
 979         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 980                 nfs4_stateid_copy(&state->stateid, stateid);
 981         nfs4_stateid_copy(&state->open_stateid, stateid);
 982         set_bit(NFS_OPEN_STATE, &state->flags);
 983         switch (fmode) {
 984                 case FMODE_READ:
 985                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 986                         break;
 987                 case FMODE_WRITE:
 988                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 989                         break;
 990                 case FMODE_READ|FMODE_WRITE:
 991                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 992         }
 993 }
 994
 995 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 996 {
 997         write_seqlock(&state->seqlock);
 998         nfs_set_open_stateid_locked(state, stateid, fmode);
 999         write_sequnlock(&state->seqlock);
1000 }
1001
1002 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1003 {
1004         /*
1005          * Protect the call to nfs4_state_set_mode_locked and
1006          * serialise the stateid update
1007          */
1008         write_seqlock(&state->seqlock);
1009         if (deleg_stateid != NULL) {
1010                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1011                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1012         }
1013         if (open_stateid != NULL)
1014                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1015         write_sequnlock(&state->seqlock);
1016         spin_lock(&state->owner->so_lock);
1017         update_open_stateflags(state, fmode);
1018         spin_unlock(&state->owner->so_lock);
1019 }
1020
1021 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1022 {
1023         struct nfs_inode *nfsi = NFS_I(state->inode);
1024         struct nfs_delegation *deleg_cur;
1025         int ret = 0;
1026
1027         fmode &= (FMODE_READ|FMODE_WRITE);
1028
1029         rcu_read_lock();
1030         deleg_cur = rcu_dereference(nfsi->delegation);
1031         if (deleg_cur == NULL)
1032                 goto no_delegation;
1033
1034         spin_lock(&deleg_cur->lock);
1035         if (nfsi->delegation != deleg_cur ||
1036            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1037             (deleg_cur->type & fmode) != fmode)
1038                 goto no_delegation_unlock;
1039
1040         if (delegation == NULL)
1041                 delegation = &deleg_cur->stateid;
1042         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1043                 goto no_delegation_unlock;
1044
1045         nfs_mark_delegation_referenced(deleg_cur);
1046         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1047         ret = 1;
1048 no_delegation_unlock:
1049         spin_unlock(&deleg_cur->lock);
1050 no_delegation:
1051         rcu_read_unlock();
1052
1053         if (!ret && open_stateid != NULL) {
1054                 __update_open_stateid(state, open_stateid, NULL, fmode);
1055                 ret = 1;
1056         }
1057
1058         return ret;
1059 }
1060
1061
1062 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1063 {
1064         struct nfs_delegation *delegation;
1065
1066         rcu_read_lock();
1067         delegation = rcu_dereference(NFS_I(inode)->delegation);
1068         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1069                 rcu_read_unlock();
1070                 return;
1071         }
1072         rcu_read_unlock();
1073         nfs4_inode_return_delegation(inode);
1074 }
1075
1076 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1077 {
1078         struct nfs4_state *state = opendata->state;
1079         struct nfs_inode *nfsi = NFS_I(state->inode);
1080         struct nfs_delegation *delegation;
1081         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1082         fmode_t fmode = opendata->o_arg.fmode;
1083         nfs4_stateid stateid;
1084         int ret = -EAGAIN;
1085
1086         for (;;) {
1087                 if (can_open_cached(state, fmode, open_mode)) {
1088                         spin_lock(&state->owner->so_lock);
1089                         if (can_open_cached(state, fmode, open_mode)) {
1090                                 update_open_stateflags(state, fmode);
1091                                 spin_unlock(&state->owner->so_lock);
1092                                 goto out_return_state;
1093                         }
1094                         spin_unlock(&state->owner->so_lock);
1095                 }
1096                 rcu_read_lock();
1097                 delegation = rcu_dereference(nfsi->delegation);
1098                 if (!can_open_delegated(delegation, fmode)) {
1099                         rcu_read_unlock();
1100                         break;
1101                 }
1102                 /* Save the delegation */
1103                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1104                 rcu_read_unlock();
1105                 nfs_release_seqid(opendata->o_arg.seqid);
1106                 if (!opendata->is_recover) {
1107                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1108                         if (ret != 0)
1109                                 goto out;
1110                 }
1111                 ret = -EAGAIN;
1112
1113                 /* Try to update the stateid using the delegation */
1114                 if (update_open_stateid(state, NULL, &stateid, fmode))
1115                         goto out_return_state;
1116         }
1117 out:
1118         return ERR_PTR(ret);
1119 out_return_state:
1120         atomic_inc(&state->count);
1121         return state;
1122 }
1123
1124 static void
1125 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1126 {
1127         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1128         struct nfs_delegation *delegation;
1129         int delegation_flags = 0;
1130
1131         rcu_read_lock();
1132         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1133         if (delegation)
1134                 delegation_flags = delegation->flags;
1135         rcu_read_unlock();
1136         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1137                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1138                                    "returning a delegation for "
1139                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1140                                    clp->cl_hostname);
1141         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1142                 nfs_inode_set_delegation(state->inode,
1143                                          data->owner->so_cred,
1144                                          &data->o_res);
1145         else
1146                 nfs_inode_reclaim_delegation(state->inode,
1147                                              data->owner->so_cred,
1148                                              &data->o_res);
1149 }
1150
1151 /*
1152  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1153  * and update the nfs4_state.
1154  */
1155 static struct nfs4_state *
1156 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1157 {
1158         struct inode *inode = data->state->inode;
1159         struct nfs4_state *state = data->state;
1160         int ret;
1161
1162         if (!data->rpc_done) {
1163                 ret = data->rpc_status;
1164                 goto err;
1165         }
1166
1167         ret = -ESTALE;
1168         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1169             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1170             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1171                 goto err;
1172
1173         ret = -ENOMEM;
1174         state = nfs4_get_open_state(inode, data->owner);
1175         if (state == NULL)
1176                 goto err;
1177
1178         ret = nfs_refresh_inode(inode, &data->f_attr);
1179         if (ret)
1180                 goto err;
1181
1182         if (data->o_res.delegation_type != 0)
1183                 nfs4_opendata_check_deleg(data, state);
1184         update_open_stateid(state, &data->o_res.stateid, NULL,
1185                             data->o_arg.fmode);
1186
1187         return state;
1188 err:
1189         return ERR_PTR(ret);
1190
1191 }
1192
1193 static struct nfs4_state *
1194 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1195 {
1196         struct inode *inode;
1197         struct nfs4_state *state = NULL;
1198         int ret;
1199
1200         if (!data->rpc_done) {
1201                 state = nfs4_try_open_cached(data);
1202                 goto out;
1203         }
1204
1205         ret = -EAGAIN;
1206         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1207                 goto err;
1208         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1209         ret = PTR_ERR(inode);
1210         if (IS_ERR(inode))
1211                 goto err;
1212         ret = -ENOMEM;
1213         state = nfs4_get_open_state(inode, data->owner);
1214         if (state == NULL)
1215                 goto err_put_inode;
1216         if (data->o_res.delegation_type != 0)
1217                 nfs4_opendata_check_deleg(data, state);
1218         update_open_stateid(state, &data->o_res.stateid, NULL,
1219                         data->o_arg.fmode);
1220         iput(inode);
1221 out:
1222         nfs_release_seqid(data->o_arg.seqid);
1223         return state;
1224 err_put_inode:
1225         iput(inode);
1226 err:
1227         return ERR_PTR(ret);
1228 }
1229
1230 static struct nfs4_state *
1231 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1232 {
1233         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1234                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1235         return _nfs4_opendata_to_nfs4_state(data);
1236 }
1237
1238 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1239 {
1240         struct nfs_inode *nfsi = NFS_I(state->inode);
1241         struct nfs_open_context *ctx;
1242
1243         spin_lock(&state->inode->i_lock);
1244         list_for_each_entry(ctx, &nfsi->open_files, list) {
1245                 if (ctx->state != state)
1246                         continue;
1247                 get_nfs_open_context(ctx);
1248                 spin_unlock(&state->inode->i_lock);
1249                 return ctx;
1250         }
1251         spin_unlock(&state->inode->i_lock);
1252         return ERR_PTR(-ENOENT);
1253 }
1254
1255 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1256                 struct nfs4_state *state, enum open_claim_type4 claim)
1257 {
1258         struct nfs4_opendata *opendata;
1259
1260         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1261                         NULL, claim, GFP_NOFS);
1262         if (opendata == NULL)
1263                 return ERR_PTR(-ENOMEM);
1264         opendata->state = state;
1265         atomic_inc(&state->count);
1266         return opendata;
1267 }
1268
1269 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1270 {
1271         struct nfs4_state *newstate;
1272         int ret;
1273
1274         opendata->o_arg.open_flags = 0;
1275         opendata->o_arg.fmode = fmode;
1276         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1277         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1278         nfs4_init_opendata_res(opendata);
1279         ret = _nfs4_recover_proc_open(opendata);
1280         if (ret != 0)
1281                 return ret;
1282         newstate = nfs4_opendata_to_nfs4_state(opendata);
1283         if (IS_ERR(newstate))
1284                 return PTR_ERR(newstate);
1285         nfs4_close_state(newstate, fmode);
1286         *res = newstate;
1287         return 0;
1288 }
1289
1290 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1291 {
1292         struct nfs4_state *newstate;
1293         int ret;
1294
1295         /* memory barrier prior to reading state->n_* */
1296         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1297         clear_bit(NFS_OPEN_STATE, &state->flags);
1298         smp_rmb();
1299         if (state->n_rdwr != 0) {
1300                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1301                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1302                 if (ret != 0)
1303                         return ret;
1304                 if (newstate != state)
1305                         return -ESTALE;
1306         }
1307         if (state->n_wronly != 0) {
1308                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1309                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1310                 if (ret != 0)
1311                         return ret;
1312                 if (newstate != state)
1313                         return -ESTALE;
1314         }
1315         if (state->n_rdonly != 0) {
1316                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1317                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1318                 if (ret != 0)
1319                         return ret;
1320                 if (newstate != state)
1321                         return -ESTALE;
1322         }
1323         /*
1324          * We may have performed cached opens for all three recoveries.
1325          * Check if we need to update the current stateid.
1326          */
1327         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1328             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1329                 write_seqlock(&state->seqlock);
1330                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1331                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1332                 write_sequnlock(&state->seqlock);
1333         }
1334         return 0;
1335 }
1336
1337 /*
1338  * OPEN_RECLAIM:
1339  *      reclaim state on the server after a reboot.
1340  */
1341 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1342 {
1343         struct nfs_delegation *delegation;
1344         struct nfs4_opendata *opendata;
1345         fmode_t delegation_type = 0;
1346         int status;
1347
1348         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1349                         NFS4_OPEN_CLAIM_PREVIOUS);
1350         if (IS_ERR(opendata))
1351                 return PTR_ERR(opendata);
1352         rcu_read_lock();
1353         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1354         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1355                 delegation_type = delegation->type;
1356         rcu_read_unlock();
1357         opendata->o_arg.u.delegation_type = delegation_type;
1358         status = nfs4_open_recover(opendata, state);
1359         nfs4_opendata_put(opendata);
1360         return status;
1361 }
1362
1363 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1364 {
1365         struct nfs_server *server = NFS_SERVER(state->inode);
1366         struct nfs4_exception exception = { };
1367         int err;
1368         do {
1369                 err = _nfs4_do_open_reclaim(ctx, state);
1370                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1371                         continue;
1372                 if (err != -NFS4ERR_DELAY)
1373                         break;
1374                 nfs4_handle_exception(server, err, &exception);
1375         } while (exception.retry);
1376         return err;
1377 }
1378
1379 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1380 {
1381         struct nfs_open_context *ctx;
1382         int ret;
1383
1384         ctx = nfs4_state_find_open_context(state);
1385         if (IS_ERR(ctx))
1386                 return -EAGAIN;
1387         ret = nfs4_do_open_reclaim(ctx, state);
1388         put_nfs_open_context(ctx);
1389         return ret;
1390 }
1391
1392 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1393 {
1394         switch (err) {
1395                 default:
1396                         printk(KERN_ERR "NFS: %s: unhandled error "
1397                                         "%d.\n", __func__, err);
1398                 case 0:
1399                 case -ENOENT:
1400                 case -ESTALE:
1401                         break;
1402                 case -NFS4ERR_BADSESSION:
1403                 case -NFS4ERR_BADSLOT:
1404                 case -NFS4ERR_BAD_HIGH_SLOT:
1405                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1406                 case -NFS4ERR_DEADSESSION:
1407                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1408                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1409                         return -EAGAIN;
1410                 case -NFS4ERR_STALE_CLIENTID:
1411                 case -NFS4ERR_STALE_STATEID:
1412                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1413                 case -NFS4ERR_EXPIRED:
1414                         /* Don't recall a delegation if it was lost */
1415                         nfs4_schedule_lease_recovery(server->nfs_client);
1416                         return -EAGAIN;
1417                 case -NFS4ERR_DELEG_REVOKED:
1418                 case -NFS4ERR_ADMIN_REVOKED:
1419                 case -NFS4ERR_BAD_STATEID:
1420                 case -NFS4ERR_OPENMODE:
1421                         nfs_inode_find_state_and_recover(state->inode,
1422                                         stateid);
1423                         nfs4_schedule_stateid_recovery(server, state);
1424                         return 0;
1425                 case -NFS4ERR_DELAY:
1426                 case -NFS4ERR_GRACE:
1427                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1428                         ssleep(1);
1429                         return -EAGAIN;
1430                 case -ENOMEM:
1431                 case -NFS4ERR_DENIED:
1432                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1433                         return 0;
1434         }
1435         return err;
1436 }
1437
1438 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1439 {
1440         struct nfs_server *server = NFS_SERVER(state->inode);
1441         struct nfs4_opendata *opendata;
1442         int err;
1443
1444         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1445                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1446         if (IS_ERR(opendata))
1447                 return PTR_ERR(opendata);
1448         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1449         err = nfs4_open_recover(opendata, state);
1450         nfs4_opendata_put(opendata);
1451         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1452 }
1453
1454 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1455 {
1456         struct nfs4_opendata *data = calldata;
1457
1458         data->rpc_status = task->tk_status;
1459         if (data->rpc_status == 0) {
1460                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1461                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1462                 renew_lease(data->o_res.server, data->timestamp);
1463                 data->rpc_done = 1;
1464         }
1465 }
1466
1467 static void nfs4_open_confirm_release(void *calldata)
1468 {
1469         struct nfs4_opendata *data = calldata;
1470         struct nfs4_state *state = NULL;
1471
1472         /* If this request hasn't been cancelled, do nothing */
1473         if (data->cancelled == 0)
1474                 goto out_free;
1475         /* In case of error, no cleanup! */
1476         if (!data->rpc_done)
1477                 goto out_free;
1478         state = nfs4_opendata_to_nfs4_state(data);
1479         if (!IS_ERR(state))
1480                 nfs4_close_state(state, data->o_arg.fmode);
1481 out_free:
1482         nfs4_opendata_put(data);
1483 }
1484
1485 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1486         .rpc_call_done = nfs4_open_confirm_done,
1487         .rpc_release = nfs4_open_confirm_release,
1488 };
1489
1490 /*
1491  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1492  */
1493 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1494 {
1495         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1496         struct rpc_task *task;
1497         struct  rpc_message msg = {
1498                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1499                 .rpc_argp = &data->c_arg,
1500                 .rpc_resp = &data->c_res,
1501                 .rpc_cred = data->owner->so_cred,
1502         };
1503         struct rpc_task_setup task_setup_data = {
1504                 .rpc_client = server->client,
1505                 .rpc_message = &msg,
1506                 .callback_ops = &nfs4_open_confirm_ops,
1507                 .callback_data = data,
1508                 .workqueue = nfsiod_workqueue,
1509                 .flags = RPC_TASK_ASYNC,
1510         };
1511         int status;
1512
1513         kref_get(&data->kref);
1514         data->rpc_done = 0;
1515         data->rpc_status = 0;
1516         data->timestamp = jiffies;
1517         task = rpc_run_task(&task_setup_data);
1518         if (IS_ERR(task))
1519                 return PTR_ERR(task);
1520         status = nfs4_wait_for_completion_rpc_task(task);
1521         if (status != 0) {
1522                 data->cancelled = 1;
1523                 smp_wmb();
1524         } else
1525                 status = data->rpc_status;
1526         rpc_put_task(task);
1527         return status;
1528 }
1529
1530 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1531 {
1532         struct nfs4_opendata *data = calldata;
1533         struct nfs4_state_owner *sp = data->owner;
1534         struct nfs_client *clp = sp->so_server->nfs_client;
1535
1536         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1537                 goto out_wait;
1538         /*
1539          * Check if we still need to send an OPEN call, or if we can use
1540          * a delegation instead.
1541          */
1542         if (data->state != NULL) {
1543                 struct nfs_delegation *delegation;
1544
1545                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1546                         goto out_no_action;
1547                 rcu_read_lock();
1548                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1549                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1550                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1551                     can_open_delegated(delegation, data->o_arg.fmode))
1552                         goto unlock_no_action;
1553                 rcu_read_unlock();
1554         }
1555         /* Update client id. */
1556         data->o_arg.clientid = clp->cl_clientid;
1557         switch (data->o_arg.claim) {
1558         case NFS4_OPEN_CLAIM_PREVIOUS:
1559         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1560         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1561                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1562         case NFS4_OPEN_CLAIM_FH:
1563                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1564                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1565         }
1566         data->timestamp = jiffies;
1567         if (nfs4_setup_sequence(data->o_arg.server,
1568                                 &data->o_arg.seq_args,
1569                                 &data->o_res.seq_res,
1570                                 task) != 0)
1571                 nfs_release_seqid(data->o_arg.seqid);
1572
1573         /* Set the create mode (note dependency on the session type) */
1574         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1575         if (data->o_arg.open_flags & O_EXCL) {
1576                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1577                 if (nfs4_has_persistent_session(clp))
1578                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1579                 else if (clp->cl_mvops->minor_version > 0)
1580                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1581         }
1582         return;
1583 unlock_no_action:
1584         rcu_read_unlock();
1585 out_no_action:
1586         task->tk_action = NULL;
1587 out_wait:
1588         nfs4_sequence_done(task, &data->o_res.seq_res);
1589 }
1590
1591 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1592 {
1593         struct nfs4_opendata *data = calldata;
1594
1595         data->rpc_status = task->tk_status;
1596
1597         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1598                 return;
1599
1600         if (task->tk_status == 0) {
1601                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1602                         switch (data->o_res.f_attr->mode & S_IFMT) {
1603                         case S_IFREG:
1604                                 break;
1605                         case S_IFLNK:
1606                                 data->rpc_status = -ELOOP;
1607                                 break;
1608                         case S_IFDIR:
1609                                 data->rpc_status = -EISDIR;
1610                                 break;
1611                         default:
1612                                 data->rpc_status = -ENOTDIR;
1613                         }
1614                 }
1615                 renew_lease(data->o_res.server, data->timestamp);
1616                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1617                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1618         }
1619         data->rpc_done = 1;
1620 }
1621
1622 static void nfs4_open_release(void *calldata)
1623 {
1624         struct nfs4_opendata *data = calldata;
1625         struct nfs4_state *state = NULL;
1626
1627         /* If this request hasn't been cancelled, do nothing */
1628         if (data->cancelled == 0)
1629                 goto out_free;
1630         /* In case of error, no cleanup! */
1631         if (data->rpc_status != 0 || !data->rpc_done)
1632                 goto out_free;
1633         /* In case we need an open_confirm, no cleanup! */
1634         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1635                 goto out_free;
1636         state = nfs4_opendata_to_nfs4_state(data);
1637         if (!IS_ERR(state))
1638                 nfs4_close_state(state, data->o_arg.fmode);
1639 out_free:
1640         nfs4_opendata_put(data);
1641 }
1642
1643 static const struct rpc_call_ops nfs4_open_ops = {
1644         .rpc_call_prepare = nfs4_open_prepare,
1645         .rpc_call_done = nfs4_open_done,
1646         .rpc_release = nfs4_open_release,
1647 };
1648
1649 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1650 {
1651         struct inode *dir = data->dir->d_inode;
1652         struct nfs_server *server = NFS_SERVER(dir);
1653         struct nfs_openargs *o_arg = &data->o_arg;
1654         struct nfs_openres *o_res = &data->o_res;
1655         struct rpc_task *task;
1656         struct rpc_message msg = {
1657                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1658                 .rpc_argp = o_arg,
1659                 .rpc_resp = o_res,
1660                 .rpc_cred = data->owner->so_cred,
1661         };
1662         struct rpc_task_setup task_setup_data = {
1663                 .rpc_client = server->client,
1664                 .rpc_message = &msg,
1665                 .callback_ops = &nfs4_open_ops,
1666                 .callback_data = data,
1667                 .workqueue = nfsiod_workqueue,
1668                 .flags = RPC_TASK_ASYNC,
1669         };
1670         int status;
1671
1672         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1673         kref_get(&data->kref);
1674         data->rpc_done = 0;
1675         data->rpc_status = 0;
1676         data->cancelled = 0;
1677         data->is_recover = 0;
1678         if (isrecover) {
1679                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1680                 data->is_recover = 1;
1681         }
1682         task = rpc_run_task(&task_setup_data);
1683         if (IS_ERR(task))
1684                 return PTR_ERR(task);
1685         status = nfs4_wait_for_completion_rpc_task(task);
1686         if (status != 0) {
1687                 data->cancelled = 1;
1688                 smp_wmb();
1689         } else
1690                 status = data->rpc_status;
1691         rpc_put_task(task);
1692
1693         return status;
1694 }
1695
1696 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1697 {
1698         struct inode *dir = data->dir->d_inode;
1699         struct nfs_openres *o_res = &data->o_res;
1700         int status;
1701
1702         status = nfs4_run_open_task(data, 1);
1703         if (status != 0 || !data->rpc_done)
1704                 return status;
1705
1706         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1707
1708         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1709                 status = _nfs4_proc_open_confirm(data);
1710                 if (status != 0)
1711                         return status;
1712         }
1713
1714         return status;
1715 }
1716
1717 static int nfs4_opendata_access(struct rpc_cred *cred,
1718                                 struct nfs4_opendata *opendata,
1719                                 struct nfs4_state *state, fmode_t fmode,
1720                                 int openflags)
1721 {
1722         struct nfs_access_entry cache;
1723         u32 mask;
1724
1725         /* access call failed or for some reason the server doesn't
1726          * support any access modes -- defer access call until later */
1727         if (opendata->o_res.access_supported == 0)
1728                 return 0;
1729
1730         mask = 0;
1731         /* don't check MAY_WRITE - a newly created file may not have
1732          * write mode bits, but POSIX allows the creating process to write.
1733          * use openflags to check for exec, because fmode won't
1734          * always have FMODE_EXEC set when file open for exec. */
1735         if (openflags & __FMODE_EXEC) {
1736                 /* ONLY check for exec rights */
1737                 mask = MAY_EXEC;
1738         } else if (fmode & FMODE_READ)
1739                 mask = MAY_READ;
1740
1741         cache.cred = cred;
1742         cache.jiffies = jiffies;
1743         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1744         nfs_access_add_cache(state->inode, &cache);
1745
1746         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1747                 return 0;
1748
1749         /* even though OPEN succeeded, access is denied. Close the file */
1750         nfs4_close_state(state, fmode);
1751         return -EACCES;
1752 }
1753
1754 /*
1755  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1756  */
1757 static int _nfs4_proc_open(struct nfs4_opendata *data)
1758 {
1759         struct inode *dir = data->dir->d_inode;
1760         struct nfs_server *server = NFS_SERVER(dir);
1761         struct nfs_openargs *o_arg = &data->o_arg;
1762         struct nfs_openres *o_res = &data->o_res;
1763         int status;
1764
1765         status = nfs4_run_open_task(data, 0);
1766         if (!data->rpc_done)
1767                 return status;
1768         if (status != 0) {
1769                 if (status == -NFS4ERR_BADNAME &&
1770                                 !(o_arg->open_flags & O_CREAT))
1771                         return -ENOENT;
1772                 return status;
1773         }
1774
1775         nfs_fattr_map_and_free_names(server, &data->f_attr);
1776
1777         if (o_arg->open_flags & O_CREAT)
1778                 update_changeattr(dir, &o_res->cinfo);
1779         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1780                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1781         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1782                 status = _nfs4_proc_open_confirm(data);
1783                 if (status != 0)
1784                         return status;
1785         }
1786         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1787                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1788         return 0;
1789 }
1790
1791 static int nfs4_recover_expired_lease(struct nfs_server *server)
1792 {
1793         return nfs4_client_recover_expired_lease(server->nfs_client);
1794 }
1795
1796 /*
1797  * OPEN_EXPIRED:
1798  *      reclaim state on the server after a network partition.
1799  *      Assumes caller holds the appropriate lock
1800  */
1801 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1802 {
1803         struct nfs4_opendata *opendata;
1804         int ret;
1805
1806         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1807                         NFS4_OPEN_CLAIM_FH);
1808         if (IS_ERR(opendata))
1809                 return PTR_ERR(opendata);
1810         ret = nfs4_open_recover(opendata, state);
1811         if (ret == -ESTALE)
1812                 d_drop(ctx->dentry);
1813         nfs4_opendata_put(opendata);
1814         return ret;
1815 }
1816
1817 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1818 {
1819         struct nfs_server *server = NFS_SERVER(state->inode);
1820         struct nfs4_exception exception = { };
1821         int err;
1822
1823         do {
1824                 err = _nfs4_open_expired(ctx, state);
1825                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1826                         continue;
1827                 switch (err) {
1828                 default:
1829                         goto out;
1830                 case -NFS4ERR_GRACE:
1831                 case -NFS4ERR_DELAY:
1832                         nfs4_handle_exception(server, err, &exception);
1833                         err = 0;
1834                 }
1835         } while (exception.retry);
1836 out:
1837         return err;
1838 }
1839
1840 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1841 {
1842         struct nfs_open_context *ctx;
1843         int ret;
1844
1845         ctx = nfs4_state_find_open_context(state);
1846         if (IS_ERR(ctx))
1847                 return -EAGAIN;
1848         ret = nfs4_do_open_expired(ctx, state);
1849         put_nfs_open_context(ctx);
1850         return ret;
1851 }
1852
1853 #if defined(CONFIG_NFS_V4_1)
1854 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1855 {
1856         struct nfs_server *server = NFS_SERVER(state->inode);
1857         nfs4_stateid *stateid = &state->stateid;
1858         int status;
1859
1860         /* If a state reset has been done, test_stateid is unneeded */
1861         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1862                 return;
1863
1864         status = nfs41_test_stateid(server, stateid);
1865         if (status != NFS_OK) {
1866                 /* Free the stateid unless the server explicitly
1867                  * informs us the stateid is unrecognized. */
1868                 if (status != -NFS4ERR_BAD_STATEID)
1869                         nfs41_free_stateid(server, stateid);
1870                 nfs_remove_bad_delegation(state->inode);
1871
1872                 write_seqlock(&state->seqlock);
1873                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1874                 write_sequnlock(&state->seqlock);
1875                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1876         }
1877 }
1878
1879 /**
1880  * nfs41_check_open_stateid - possibly free an open stateid
1881  *
1882  * @state: NFSv4 state for an inode
1883  *
1884  * Returns NFS_OK if recovery for this stateid is now finished.
1885  * Otherwise a negative NFS4ERR value is returned.
1886  */
1887 static int nfs41_check_open_stateid(struct nfs4_state *state)
1888 {
1889         struct nfs_server *server = NFS_SERVER(state->inode);
1890         nfs4_stateid *stateid = &state->open_stateid;
1891         int status;
1892
1893         /* If a state reset has been done, test_stateid is unneeded */
1894         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1895             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1896             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1897                 return -NFS4ERR_BAD_STATEID;
1898
1899         status = nfs41_test_stateid(server, stateid);
1900         if (status != NFS_OK) {
1901                 /* Free the stateid unless the server explicitly
1902                  * informs us the stateid is unrecognized. */
1903                 if (status != -NFS4ERR_BAD_STATEID)
1904                         nfs41_free_stateid(server, stateid);
1905
1906                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1907                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1908                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1909                 clear_bit(NFS_OPEN_STATE, &state->flags);
1910         }
1911         return status;
1912 }
1913
1914 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1915 {
1916         int status;
1917
1918         nfs41_clear_delegation_stateid(state);
1919         status = nfs41_check_open_stateid(state);
1920         if (status != NFS_OK)
1921                 status = nfs4_open_expired(sp, state);
1922         return status;
1923 }
1924 #endif
1925
1926 /*
1927  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1928  * fields corresponding to attributes that were used to store the verifier.
1929  * Make sure we clobber those fields in the later setattr call
1930  */
1931 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1932 {
1933         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1934             !(sattr->ia_valid & ATTR_ATIME_SET))
1935                 sattr->ia_valid |= ATTR_ATIME;
1936
1937         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1938             !(sattr->ia_valid & ATTR_MTIME_SET))
1939                 sattr->ia_valid |= ATTR_MTIME;
1940 }
1941
1942 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1943                 fmode_t fmode,
1944                 int flags,
1945                 struct nfs4_state **res)
1946 {
1947         struct nfs4_state_owner *sp = opendata->owner;
1948         struct nfs_server *server = sp->so_server;
1949         struct nfs4_state *state;
1950         unsigned int seq;
1951         int ret;
1952
1953         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1954
1955         ret = _nfs4_proc_open(opendata);
1956         if (ret != 0)
1957                 goto out;
1958
1959         state = nfs4_opendata_to_nfs4_state(opendata);
1960         ret = PTR_ERR(state);
1961         if (IS_ERR(state))
1962                 goto out;
1963         if (server->caps & NFS_CAP_POSIX_LOCK)
1964                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1965
1966         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1967         if (ret != 0)
1968                 goto out;
1969
1970         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
1971                 nfs4_schedule_stateid_recovery(server, state);
1972         *res = state;
1973 out:
1974         return ret;
1975 }
1976
1977 /*
1978  * Returns a referenced nfs4_state
1979  */
1980 static int _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_state **res,
1987                         struct nfs4_threshold **ctx_th)
1988 {
1989         struct nfs4_state_owner  *sp;
1990         struct nfs4_state     *state = NULL;
1991         struct nfs_server       *server = NFS_SERVER(dir);
1992         struct nfs4_opendata *opendata;
1993         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
1994         int status;
1995
1996         /* Protect against reboot recovery conflicts */
1997         status = -ENOMEM;
1998         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1999         if (sp == NULL) {
2000                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2001                 goto out_err;
2002         }
2003         status = nfs4_recover_expired_lease(server);
2004         if (status != 0)
2005                 goto err_put_state_owner;
2006         if (dentry->d_inode != NULL)
2007                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2008         status = -ENOMEM;
2009         if (dentry->d_inode)
2010                 claim = NFS4_OPEN_CLAIM_FH;
2011         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2012                         claim, GFP_KERNEL);
2013         if (opendata == NULL)
2014                 goto err_put_state_owner;
2015
2016         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2017                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2018                 if (!opendata->f_attr.mdsthreshold)
2019                         goto err_opendata_put;
2020                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2021         }
2022         if (dentry->d_inode != NULL)
2023                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2024
2025         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
2026         if (status != 0)
2027                 goto err_opendata_put;
2028
2029         if ((opendata->o_arg.open_flags & O_EXCL) &&
2030             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2031                 nfs4_exclusive_attrset(opendata, sattr);
2032
2033                 nfs_fattr_init(opendata->o_res.f_attr);
2034                 status = nfs4_do_setattr(state->inode, cred,
2035                                 opendata->o_res.f_attr, sattr,
2036                                 state);
2037                 if (status == 0)
2038                         nfs_setattr_update_inode(state->inode, sattr);
2039                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2040         }
2041
2042         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2043                 *ctx_th = opendata->f_attr.mdsthreshold;
2044         else
2045                 kfree(opendata->f_attr.mdsthreshold);
2046         opendata->f_attr.mdsthreshold = NULL;
2047
2048         nfs4_opendata_put(opendata);
2049         nfs4_put_state_owner(sp);
2050         *res = state;
2051         return 0;
2052 err_opendata_put:
2053         kfree(opendata->f_attr.mdsthreshold);
2054         nfs4_opendata_put(opendata);
2055 err_put_state_owner:
2056         nfs4_put_state_owner(sp);
2057 out_err:
2058         *res = NULL;
2059         return status;
2060 }
2061
2062
2063 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2064                                         struct dentry *dentry,
2065                                         fmode_t fmode,
2066                                         int flags,
2067                                         struct iattr *sattr,
2068                                         struct rpc_cred *cred,
2069                                         struct nfs4_threshold **ctx_th)
2070 {
2071         struct nfs_server *server = NFS_SERVER(dir);
2072         struct nfs4_exception exception = { };
2073         struct nfs4_state *res;
2074         int status;
2075
2076         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2077         do {
2078                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2079                                        &res, ctx_th);
2080                 if (status == 0)
2081                         break;
2082                 /* NOTE: BAD_SEQID means the server and client disagree about the
2083                  * book-keeping w.r.t. state-changing operations
2084                  * (OPEN/CLOSE/LOCK/LOCKU...)
2085                  * It is actually a sign of a bug on the client or on the server.
2086                  *
2087                  * If we receive a BAD_SEQID error in the particular case of
2088                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2089                  * have unhashed the old state_owner for us, and that we can
2090                  * therefore safely retry using a new one. We should still warn
2091                  * the user though...
2092                  */
2093                 if (status == -NFS4ERR_BAD_SEQID) {
2094                         pr_warn_ratelimited("NFS: v4 server %s "
2095                                         " returned a bad sequence-id error!\n",
2096                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2097                         exception.retry = 1;
2098                         continue;
2099                 }
2100                 /*
2101                  * BAD_STATEID on OPEN means that the server cancelled our
2102                  * state before it received the OPEN_CONFIRM.
2103                  * Recover by retrying the request as per the discussion
2104                  * on Page 181 of RFC3530.
2105                  */
2106                 if (status == -NFS4ERR_BAD_STATEID) {
2107                         exception.retry = 1;
2108                         continue;
2109                 }
2110                 if (status == -EAGAIN) {
2111                         /* We must have found a delegation */
2112                         exception.retry = 1;
2113                         continue;
2114                 }
2115                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2116                         continue;
2117                 res = ERR_PTR(nfs4_handle_exception(server,
2118                                         status, &exception));
2119         } while (exception.retry);
2120         return res;
2121 }
2122
2123 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2124                             struct nfs_fattr *fattr, struct iattr *sattr,
2125                             struct nfs4_state *state)
2126 {
2127         struct nfs_server *server = NFS_SERVER(inode);
2128         struct nfs_setattrargs  arg = {
2129                 .fh             = NFS_FH(inode),
2130                 .iap            = sattr,
2131                 .server         = server,
2132                 .bitmask = server->attr_bitmask,
2133         };
2134         struct nfs_setattrres  res = {
2135                 .fattr          = fattr,
2136                 .server         = server,
2137         };
2138         struct rpc_message msg = {
2139                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2140                 .rpc_argp       = &arg,
2141                 .rpc_resp       = &res,
2142                 .rpc_cred       = cred,
2143         };
2144         unsigned long timestamp = jiffies;
2145         fmode_t fmode;
2146         bool truncate;
2147         int status;
2148
2149         nfs_fattr_init(fattr);
2150
2151         /* Servers should only apply open mode checks for file size changes */
2152         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2153         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2154
2155         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2156                 /* Use that stateid */
2157         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2158                 struct nfs_lockowner lockowner = {
2159                         .l_owner = current->files,
2160                         .l_pid = current->tgid,
2161                 };
2162                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2163                                 &lockowner);
2164         } else
2165                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2166
2167         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2168         if (status == 0 && state != NULL)
2169                 renew_lease(server, timestamp);
2170         return status;
2171 }
2172
2173 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2174                            struct nfs_fattr *fattr, struct iattr *sattr,
2175                            struct nfs4_state *state)
2176 {
2177         struct nfs_server *server = NFS_SERVER(inode);
2178         struct nfs4_exception exception = {
2179                 .state = state,
2180                 .inode = inode,
2181         };
2182         int err;
2183         do {
2184                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2185                 switch (err) {
2186                 case -NFS4ERR_OPENMODE:
2187                         if (state && !(state->state & FMODE_WRITE)) {
2188                                 err = -EBADF;
2189                                 if (sattr->ia_valid & ATTR_OPEN)
2190                                         err = -EACCES;
2191                                 goto out;
2192                         }
2193                 }
2194                 err = nfs4_handle_exception(server, err, &exception);
2195         } while (exception.retry);
2196 out:
2197         return err;
2198 }
2199
2200 struct nfs4_closedata {
2201         struct inode *inode;
2202         struct nfs4_state *state;
2203         struct nfs_closeargs arg;
2204         struct nfs_closeres res;
2205         struct nfs_fattr fattr;
2206         unsigned long timestamp;
2207         bool roc;
2208         u32 roc_barrier;
2209 };
2210
2211 static void nfs4_free_closedata(void *data)
2212 {
2213         struct nfs4_closedata *calldata = data;
2214         struct nfs4_state_owner *sp = calldata->state->owner;
2215         struct super_block *sb = calldata->state->inode->i_sb;
2216
2217         if (calldata->roc)
2218                 pnfs_roc_release(calldata->state->inode);
2219         nfs4_put_open_state(calldata->state);
2220         nfs_free_seqid(calldata->arg.seqid);
2221         nfs4_put_state_owner(sp);
2222         nfs_sb_deactive(sb);
2223         kfree(calldata);
2224 }
2225
2226 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2227                 fmode_t fmode)
2228 {
2229         spin_lock(&state->owner->so_lock);
2230         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2231         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2232         case FMODE_WRITE:
2233                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2234                 break;
2235         case FMODE_READ:
2236                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2237                 break;
2238         case 0:
2239                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2240                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2241                 clear_bit(NFS_OPEN_STATE, &state->flags);
2242         }
2243         spin_unlock(&state->owner->so_lock);
2244 }
2245
2246 static void nfs4_close_done(struct rpc_task *task, void *data)
2247 {
2248         struct nfs4_closedata *calldata = data;
2249         struct nfs4_state *state = calldata->state;
2250         struct nfs_server *server = NFS_SERVER(calldata->inode);
2251
2252         dprintk("%s: begin!\n", __func__);
2253         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2254                 return;
2255         /* hmm. we are done with the inode, and in the process of freeing
2256          * the state_owner. we keep this around to process errors
2257          */
2258         switch (task->tk_status) {
2259                 case 0:
2260                         if (calldata->roc)
2261                                 pnfs_roc_set_barrier(state->inode,
2262                                                      calldata->roc_barrier);
2263                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2264                         renew_lease(server, calldata->timestamp);
2265                         nfs4_close_clear_stateid_flags(state,
2266                                         calldata->arg.fmode);
2267                         break;
2268                 case -NFS4ERR_STALE_STATEID:
2269                 case -NFS4ERR_OLD_STATEID:
2270                 case -NFS4ERR_BAD_STATEID:
2271                 case -NFS4ERR_EXPIRED:
2272                         if (calldata->arg.fmode == 0)
2273                                 break;
2274                 default:
2275                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2276                                 rpc_restart_call_prepare(task);
2277         }
2278         nfs_release_seqid(calldata->arg.seqid);
2279         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2280         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2281 }
2282
2283 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2284 {
2285         struct nfs4_closedata *calldata = data;
2286         struct nfs4_state *state = calldata->state;
2287         struct inode *inode = calldata->inode;
2288         int call_close = 0;
2289
2290         dprintk("%s: begin!\n", __func__);
2291         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2292                 goto out_wait;
2293
2294         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2295         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2296         spin_lock(&state->owner->so_lock);
2297         /* Calculate the change in open mode */
2298         if (state->n_rdwr == 0) {
2299                 if (state->n_rdonly == 0) {
2300                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2301                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2302                         calldata->arg.fmode &= ~FMODE_READ;
2303                 }
2304                 if (state->n_wronly == 0) {
2305                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2306                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2307                         calldata->arg.fmode &= ~FMODE_WRITE;
2308                 }
2309         }
2310         if (!nfs4_valid_open_stateid(state))
2311                 call_close = 0;
2312         spin_unlock(&state->owner->so_lock);
2313
2314         if (!call_close) {
2315                 /* Note: exit _without_ calling nfs4_close_done */
2316                 goto out_no_action;
2317         }
2318
2319         if (calldata->arg.fmode == 0) {
2320                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2321                 if (calldata->roc &&
2322                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2323                         nfs_release_seqid(calldata->arg.seqid);
2324                         goto out_wait;
2325                     }
2326         }
2327
2328         nfs_fattr_init(calldata->res.fattr);
2329         calldata->timestamp = jiffies;
2330         if (nfs4_setup_sequence(NFS_SERVER(inode),
2331                                 &calldata->arg.seq_args,
2332                                 &calldata->res.seq_res,
2333                                 task) != 0)
2334                 nfs_release_seqid(calldata->arg.seqid);
2335         dprintk("%s: done!\n", __func__);
2336         return;
2337 out_no_action:
2338         task->tk_action = NULL;
2339 out_wait:
2340         nfs4_sequence_done(task, &calldata->res.seq_res);
2341 }
2342
2343 static const struct rpc_call_ops nfs4_close_ops = {
2344         .rpc_call_prepare = nfs4_close_prepare,
2345         .rpc_call_done = nfs4_close_done,
2346         .rpc_release = nfs4_free_closedata,
2347 };
2348
2349 /*
2350  * It is possible for data to be read/written from a mem-mapped file
2351  * after the sys_close call (which hits the vfs layer as a flush).
2352  * This means that we can't safely call nfsv4 close on a file until
2353  * the inode is cleared. This in turn means that we are not good
2354  * NFSv4 citizens - we do not indicate to the server to update the file's
2355  * share state even when we are done with one of the three share
2356  * stateid's in the inode.
2357  *
2358  * NOTE: Caller must be holding the sp->so_owner semaphore!
2359  */
2360 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2361 {
2362         struct nfs_server *server = NFS_SERVER(state->inode);
2363         struct nfs4_closedata *calldata;
2364         struct nfs4_state_owner *sp = state->owner;
2365         struct rpc_task *task;
2366         struct rpc_message msg = {
2367                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2368                 .rpc_cred = state->owner->so_cred,
2369         };
2370         struct rpc_task_setup task_setup_data = {
2371                 .rpc_client = server->client,
2372                 .rpc_message = &msg,
2373                 .callback_ops = &nfs4_close_ops,
2374                 .workqueue = nfsiod_workqueue,
2375                 .flags = RPC_TASK_ASYNC,
2376         };
2377         int status = -ENOMEM;
2378
2379         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2380         if (calldata == NULL)
2381                 goto out;
2382         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2383         calldata->inode = state->inode;
2384         calldata->state = state;
2385         calldata->arg.fh = NFS_FH(state->inode);
2386         calldata->arg.stateid = &state->open_stateid;
2387         /* Serialization for the sequence id */
2388         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2389         if (calldata->arg.seqid == NULL)
2390                 goto out_free_calldata;
2391         calldata->arg.fmode = 0;
2392         calldata->arg.bitmask = server->cache_consistency_bitmask;
2393         calldata->res.fattr = &calldata->fattr;
2394         calldata->res.seqid = calldata->arg.seqid;
2395         calldata->res.server = server;
2396         calldata->roc = pnfs_roc(state->inode);
2397         nfs_sb_active(calldata->inode->i_sb);
2398
2399         msg.rpc_argp = &calldata->arg;
2400         msg.rpc_resp = &calldata->res;
2401         task_setup_data.callback_data = calldata;
2402         task = rpc_run_task(&task_setup_data);
2403         if (IS_ERR(task))
2404                 return PTR_ERR(task);
2405         status = 0;
2406         if (wait)
2407                 status = rpc_wait_for_completion_task(task);
2408         rpc_put_task(task);
2409         return status;
2410 out_free_calldata:
2411         kfree(calldata);
2412 out:
2413         nfs4_put_open_state(state);
2414         nfs4_put_state_owner(sp);
2415         return status;
2416 }
2417
2418 static struct inode *
2419 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2420 {
2421         struct nfs4_state *state;
2422
2423         /* Protect against concurrent sillydeletes */
2424         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2425                              ctx->cred, &ctx->mdsthreshold);
2426         if (IS_ERR(state))
2427                 return ERR_CAST(state);
2428         ctx->state = state;
2429         return igrab(state->inode);
2430 }
2431
2432 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2433 {
2434         if (ctx->state == NULL)
2435                 return;
2436         if (is_sync)
2437                 nfs4_close_sync(ctx->state, ctx->mode);
2438         else
2439                 nfs4_close_state(ctx->state, ctx->mode);
2440 }
2441
2442 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2443 {
2444         struct nfs4_server_caps_arg args = {
2445                 .fhandle = fhandle,
2446         };
2447         struct nfs4_server_caps_res res = {};
2448         struct rpc_message msg = {
2449                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2450                 .rpc_argp = &args,
2451                 .rpc_resp = &res,
2452         };
2453         int status;
2454
2455         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2456         if (status == 0) {
2457                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2458                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2459                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2460                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2461                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2462                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2463                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2464                         server->caps |= NFS_CAP_ACLS;
2465                 if (res.has_links != 0)
2466                         server->caps |= NFS_CAP_HARDLINKS;
2467                 if (res.has_symlinks != 0)
2468                         server->caps |= NFS_CAP_SYMLINKS;
2469                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2470                         server->caps |= NFS_CAP_FILEID;
2471                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2472                         server->caps |= NFS_CAP_MODE;
2473                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2474                         server->caps |= NFS_CAP_NLINK;
2475                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2476                         server->caps |= NFS_CAP_OWNER;
2477                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2478                         server->caps |= NFS_CAP_OWNER_GROUP;
2479                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2480                         server->caps |= NFS_CAP_ATIME;
2481                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2482                         server->caps |= NFS_CAP_CTIME;
2483                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2484                         server->caps |= NFS_CAP_MTIME;
2485
2486                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2487                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2488                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2489                 server->acl_bitmask = res.acl_bitmask;
2490                 server->fh_expire_type = res.fh_expire_type;
2491         }
2492
2493         return status;
2494 }
2495
2496 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2497 {
2498         struct nfs4_exception exception = { };
2499         int err;
2500         do {
2501                 err = nfs4_handle_exception(server,
2502                                 _nfs4_server_capabilities(server, fhandle),
2503                                 &exception);
2504         } while (exception.retry);
2505         return err;
2506 }
2507
2508 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2509                 struct nfs_fsinfo *info)
2510 {
2511         struct nfs4_lookup_root_arg args = {
2512                 .bitmask = nfs4_fattr_bitmap,
2513         };
2514         struct nfs4_lookup_res res = {
2515                 .server = server,
2516                 .fattr = info->fattr,
2517                 .fh = fhandle,
2518         };
2519         struct rpc_message msg = {
2520                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2521                 .rpc_argp = &args,
2522                 .rpc_resp = &res,
2523         };
2524
2525         nfs_fattr_init(info->fattr);
2526         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2527 }
2528
2529 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2530                 struct nfs_fsinfo *info)
2531 {
2532         struct nfs4_exception exception = { };
2533         int err;
2534         do {
2535                 err = _nfs4_lookup_root(server, fhandle, info);
2536                 switch (err) {
2537                 case 0:
2538                 case -NFS4ERR_WRONGSEC:
2539                         goto out;
2540                 default:
2541                         err = nfs4_handle_exception(server, err, &exception);
2542                 }
2543         } while (exception.retry);
2544 out:
2545         return err;
2546 }
2547
2548 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2549                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2550 {
2551         struct rpc_auth *auth;
2552         int ret;
2553
2554         auth = rpcauth_create(flavor, server->client);
2555         if (IS_ERR(auth)) {
2556                 ret = -EACCES;
2557                 goto out;
2558         }
2559         ret = nfs4_lookup_root(server, fhandle, info);
2560 out:
2561         return ret;
2562 }
2563
2564 /*
2565  * Retry pseudoroot lookup with various security flavors.  We do this when:
2566  *
2567  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2568  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2569  *
2570  * Returns zero on success, or a negative NFS4ERR value, or a
2571  * negative errno value.
2572  */
2573 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2574                               struct nfs_fsinfo *info)
2575 {
2576         /* Per 3530bis 15.33.5 */
2577         static const rpc_authflavor_t flav_array[] = {
2578                 RPC_AUTH_GSS_KRB5P,
2579                 RPC_AUTH_GSS_KRB5I,
2580                 RPC_AUTH_GSS_KRB5,
2581                 RPC_AUTH_UNIX,                  /* courtesy */
2582                 RPC_AUTH_NULL,
2583         };
2584         int status = -EPERM;
2585         size_t i;
2586
2587         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2588                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2589                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2590                         continue;
2591                 break;
2592         }
2593
2594         /*
2595          * -EACCESS could mean that the user doesn't have correct permissions
2596          * to access the mount.  It could also mean that we tried to mount
2597          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2598          * existing mount programs don't handle -EACCES very well so it should
2599          * be mapped to -EPERM instead.
2600          */
2601         if (status == -EACCES)
2602                 status = -EPERM;
2603         return status;
2604 }
2605
2606 static int nfs4_do_find_root_sec(struct nfs_server *server,
2607                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2608 {
2609         int mv = server->nfs_client->cl_minorversion;
2610         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2611 }
2612
2613 /**
2614  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2615  * @server: initialized nfs_server handle
2616  * @fhandle: we fill in the pseudo-fs root file handle
2617  * @info: we fill in an FSINFO struct
2618  *
2619  * Returns zero on success, or a negative errno.
2620  */
2621 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2622                          struct nfs_fsinfo *info)
2623 {
2624         int status;
2625
2626         status = nfs4_lookup_root(server, fhandle, info);
2627         if ((status == -NFS4ERR_WRONGSEC) &&
2628             !(server->flags & NFS_MOUNT_SECFLAVOUR))
2629                 status = nfs4_do_find_root_sec(server, fhandle, info);
2630
2631         if (status == 0)
2632                 status = nfs4_server_capabilities(server, fhandle);
2633         if (status == 0)
2634                 status = nfs4_do_fsinfo(server, fhandle, info);
2635
2636         return nfs4_map_errors(status);
2637 }
2638
2639 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2640                               struct nfs_fsinfo *info)
2641 {
2642         int error;
2643         struct nfs_fattr *fattr = info->fattr;
2644
2645         error = nfs4_server_capabilities(server, mntfh);
2646         if (error < 0) {
2647                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2648                 return error;
2649         }
2650
2651         error = nfs4_proc_getattr(server, mntfh, fattr);
2652         if (error < 0) {
2653                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2654                 return error;
2655         }
2656
2657         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2658             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2659                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2660
2661         return error;
2662 }
2663
2664 /*
2665  * Get locations and (maybe) other attributes of a referral.
2666  * Note that we'll actually follow the referral later when
2667  * we detect fsid mismatch in inode revalidation
2668  */
2669 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2670                              const struct qstr *name, struct nfs_fattr *fattr,
2671                              struct nfs_fh *fhandle)
2672 {
2673         int status = -ENOMEM;
2674         struct page *page = NULL;
2675         struct nfs4_fs_locations *locations = NULL;
2676
2677         page = alloc_page(GFP_KERNEL);
2678         if (page == NULL)
2679                 goto out;
2680         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2681         if (locations == NULL)
2682                 goto out;
2683
2684         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2685         if (status != 0)
2686                 goto out;
2687         /* Make sure server returned a different fsid for the referral */
2688         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2689                 dprintk("%s: server did not return a different fsid for"
2690                         " a referral at %s\n", __func__, name->name);
2691                 status = -EIO;
2692                 goto out;
2693         }
2694         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2695         nfs_fixup_referral_attributes(&locations->fattr);
2696
2697         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2698         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2699         memset(fhandle, 0, sizeof(struct nfs_fh));
2700 out:
2701         if (page)
2702                 __free_page(page);
2703         kfree(locations);
2704         return status;
2705 }
2706
2707 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2708 {
2709         struct nfs4_getattr_arg args = {
2710                 .fh = fhandle,
2711                 .bitmask = server->attr_bitmask,
2712         };
2713         struct nfs4_getattr_res res = {
2714                 .fattr = fattr,
2715                 .server = server,
2716         };
2717         struct rpc_message msg = {
2718                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2719                 .rpc_argp = &args,
2720                 .rpc_resp = &res,
2721         };
2722
2723         nfs_fattr_init(fattr);
2724         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2725 }
2726
2727 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2728 {
2729         struct nfs4_exception exception = { };
2730         int err;
2731         do {
2732                 err = nfs4_handle_exception(server,
2733                                 _nfs4_proc_getattr(server, fhandle, fattr),
2734                                 &exception);
2735         } while (exception.retry);
2736         return err;
2737 }
2738
2739 /*
2740  * The file is not closed if it is opened due to the a request to change
2741  * the size of the file. The open call will not be needed once the
2742  * VFS layer lookup-intents are implemented.
2743  *
2744  * Close is called when the inode is destroyed.
2745  * If we haven't opened the file for O_WRONLY, we
2746  * need to in the size_change case to obtain a stateid.
2747  *
2748  * Got race?
2749  * Because OPEN is always done by name in nfsv4, it is
2750  * possible that we opened a different file by the same
2751  * name.  We can recognize this race condition, but we
2752  * can't do anything about it besides returning an error.
2753  *
2754  * This will be fixed with VFS changes (lookup-intent).
2755  */
2756 static int
2757 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2758                   struct iattr *sattr)
2759 {
2760         struct inode *inode = dentry->d_inode;
2761         struct rpc_cred *cred = NULL;
2762         struct nfs4_state *state = NULL;
2763         int status;
2764
2765         if (pnfs_ld_layoutret_on_setattr(inode))
2766                 pnfs_commit_and_return_layout(inode);
2767
2768         nfs_fattr_init(fattr);
2769
2770         /* Deal with open(O_TRUNC) */
2771         if (sattr->ia_valid & ATTR_OPEN)
2772                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2773
2774         /* Optimization: if the end result is no change, don't RPC */
2775         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2776                 return 0;
2777
2778         /* Search for an existing open(O_WRITE) file */
2779         if (sattr->ia_valid & ATTR_FILE) {
2780                 struct nfs_open_context *ctx;
2781
2782                 ctx = nfs_file_open_context(sattr->ia_file);
2783                 if (ctx) {
2784                         cred = ctx->cred;
2785                         state = ctx->state;
2786                 }
2787         }
2788
2789         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2790         if (status == 0)
2791                 nfs_setattr_update_inode(inode, sattr);
2792         return status;
2793 }
2794
2795 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2796                 const struct qstr *name, struct nfs_fh *fhandle,
2797                 struct nfs_fattr *fattr)
2798 {
2799         struct nfs_server *server = NFS_SERVER(dir);
2800         int                    status;
2801         struct nfs4_lookup_arg args = {
2802                 .bitmask = server->attr_bitmask,
2803                 .dir_fh = NFS_FH(dir),
2804                 .name = name,
2805         };
2806         struct nfs4_lookup_res res = {
2807                 .server = server,
2808                 .fattr = fattr,
2809                 .fh = fhandle,
2810         };
2811         struct rpc_message msg = {
2812                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2813                 .rpc_argp = &args,
2814                 .rpc_resp = &res,
2815         };
2816
2817         nfs_fattr_init(fattr);
2818
2819         dprintk("NFS call  lookup %s\n", name->name);
2820         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2821         dprintk("NFS reply lookup: %d\n", status);
2822         return status;
2823 }
2824
2825 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2826 {
2827         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2828                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2829         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2830         fattr->nlink = 2;
2831 }
2832
2833 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2834                                    struct qstr *name, struct nfs_fh *fhandle,
2835                                    struct nfs_fattr *fattr)
2836 {
2837         struct nfs4_exception exception = { };
2838         struct rpc_clnt *client = *clnt;
2839         int err;
2840         do {
2841                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2842                 switch (err) {
2843                 case -NFS4ERR_BADNAME:
2844                         err = -ENOENT;
2845                         goto out;
2846                 case -NFS4ERR_MOVED:
2847                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2848                         goto out;
2849                 case -NFS4ERR_WRONGSEC:
2850                         err = -EPERM;
2851                         if (client != *clnt)
2852                                 goto out;
2853
2854                         client = nfs4_create_sec_client(client, dir, name);
2855                         if (IS_ERR(client))
2856                                 return PTR_ERR(client);
2857
2858                         exception.retry = 1;
2859                         break;
2860                 default:
2861                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2862                 }
2863         } while (exception.retry);
2864
2865 out:
2866         if (err == 0)
2867                 *clnt = client;
2868         else if (client != *clnt)
2869                 rpc_shutdown_client(client);
2870
2871         return err;
2872 }
2873
2874 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2875                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2876 {
2877         int status;
2878         struct rpc_clnt *client = NFS_CLIENT(dir);
2879
2880         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2881         if (client != NFS_CLIENT(dir)) {
2882                 rpc_shutdown_client(client);
2883                 nfs_fixup_secinfo_attributes(fattr);
2884         }
2885         return status;
2886 }
2887
2888 struct rpc_clnt *
2889 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2890                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2891 {
2892         int status;
2893         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2894
2895         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2896         if (status < 0) {
2897                 rpc_shutdown_client(client);
2898                 return ERR_PTR(status);
2899         }
2900         return client;
2901 }
2902
2903 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2904 {
2905         struct nfs_server *server = NFS_SERVER(inode);
2906         struct nfs4_accessargs args = {
2907                 .fh = NFS_FH(inode),
2908                 .bitmask = server->cache_consistency_bitmask,
2909         };
2910         struct nfs4_accessres res = {
2911                 .server = server,
2912         };
2913         struct rpc_message msg = {
2914                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2915                 .rpc_argp = &args,
2916                 .rpc_resp = &res,
2917                 .rpc_cred = entry->cred,
2918         };
2919         int mode = entry->mask;
2920         int status;
2921
2922         /*
2923          * Determine which access bits we want to ask for...
2924          */
2925         if (mode & MAY_READ)
2926                 args.access |= NFS4_ACCESS_READ;
2927         if (S_ISDIR(inode->i_mode)) {
2928                 if (mode & MAY_WRITE)
2929                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2930                 if (mode & MAY_EXEC)
2931                         args.access |= NFS4_ACCESS_LOOKUP;
2932         } else {
2933                 if (mode & MAY_WRITE)
2934                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2935                 if (mode & MAY_EXEC)
2936                         args.access |= NFS4_ACCESS_EXECUTE;
2937         }
2938
2939         res.fattr = nfs_alloc_fattr();
2940         if (res.fattr == NULL)
2941                 return -ENOMEM;
2942
2943         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2944         if (!status) {
2945                 nfs_access_set_mask(entry, res.access);
2946                 nfs_refresh_inode(inode, res.fattr);
2947         }
2948         nfs_free_fattr(res.fattr);
2949         return status;
2950 }
2951
2952 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2953 {
2954         struct nfs4_exception exception = { };
2955         int err;
2956         do {
2957                 err = nfs4_handle_exception(NFS_SERVER(inode),
2958                                 _nfs4_proc_access(inode, entry),
2959                                 &exception);
2960         } while (exception.retry);
2961         return err;
2962 }
2963
2964 /*
2965  * TODO: For the time being, we don't try to get any attributes
2966  * along with any of the zero-copy operations READ, READDIR,
2967  * READLINK, WRITE.
2968  *
2969  * In the case of the first three, we want to put the GETATTR
2970  * after the read-type operation -- this is because it is hard
2971  * to predict the length of a GETATTR response in v4, and thus
2972  * align the READ data correctly.  This means that the GETATTR
2973  * may end up partially falling into the page cache, and we should
2974  * shift it into the 'tail' of the xdr_buf before processing.
2975  * To do this efficiently, we need to know the total length
2976  * of data received, which doesn't seem to be available outside
2977  * of the RPC layer.
2978  *
2979  * In the case of WRITE, we also want to put the GETATTR after
2980  * the operation -- in this case because we want to make sure
2981  * we get the post-operation mtime and size.
2982  *
2983  * Both of these changes to the XDR layer would in fact be quite
2984  * minor, but I decided to leave them for a subsequent patch.
2985  */
2986 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2987                 unsigned int pgbase, unsigned int pglen)
2988 {
2989         struct nfs4_readlink args = {
2990                 .fh       = NFS_FH(inode),
2991                 .pgbase   = pgbase,
2992                 .pglen    = pglen,
2993                 .pages    = &page,
2994         };
2995         struct nfs4_readlink_res res;
2996         struct rpc_message msg = {
2997                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2998                 .rpc_argp = &args,
2999                 .rpc_resp = &res,
3000         };
3001
3002         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3003 }
3004
3005 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3006                 unsigned int pgbase, unsigned int pglen)
3007 {
3008         struct nfs4_exception exception = { };
3009         int err;
3010         do {
3011                 err = nfs4_handle_exception(NFS_SERVER(inode),
3012                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
3013                                 &exception);
3014         } while (exception.retry);
3015         return err;
3016 }
3017
3018 /*
3019  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3020  */
3021 static int
3022 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3023                  int flags)
3024 {
3025         struct nfs_open_context *ctx;
3026         struct nfs4_state *state;
3027         int status = 0;
3028
3029         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3030         if (IS_ERR(ctx))
3031                 return PTR_ERR(ctx);
3032
3033         sattr->ia_mode &= ~current_umask();
3034         state = nfs4_do_open(dir, dentry, ctx->mode,
3035                         flags, sattr, ctx->cred,
3036                         &ctx->mdsthreshold);
3037         d_drop(dentry);
3038         if (IS_ERR(state)) {
3039                 status = PTR_ERR(state);
3040                 goto out;
3041         }
3042         d_add(dentry, igrab(state->inode));
3043         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
3044         ctx->state = state;
3045 out:
3046         put_nfs_open_context(ctx);
3047         return status;
3048 }
3049
3050 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3051 {
3052         struct nfs_server *server = NFS_SERVER(dir);
3053         struct nfs_removeargs args = {
3054                 .fh = NFS_FH(dir),
3055                 .name = *name,
3056         };
3057         struct nfs_removeres res = {
3058                 .server = server,
3059         };
3060         struct rpc_message msg = {
3061                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3062                 .rpc_argp = &args,
3063                 .rpc_resp = &res,
3064         };
3065         int status;
3066
3067         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3068         if (status == 0)
3069                 update_changeattr(dir, &res.cinfo);
3070         return status;
3071 }
3072
3073 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3074 {
3075         struct nfs4_exception exception = { };
3076         int err;
3077         do {
3078                 err = nfs4_handle_exception(NFS_SERVER(dir),
3079                                 _nfs4_proc_remove(dir, name),
3080                                 &exception);
3081         } while (exception.retry);
3082         return err;
3083 }
3084
3085 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3086 {
3087         struct nfs_server *server = NFS_SERVER(dir);
3088         struct nfs_removeargs *args = msg->rpc_argp;
3089         struct nfs_removeres *res = msg->rpc_resp;
3090
3091         res->server = server;
3092         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3093         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3094 }
3095
3096 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3097 {
3098         nfs4_setup_sequence(NFS_SERVER(data->dir),
3099                         &data->args.seq_args,
3100                         &data->res.seq_res,
3101                         task);
3102 }
3103
3104 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3105 {
3106         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3107
3108         if (!nfs4_sequence_done(task, &res->seq_res))
3109                 return 0;
3110         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3111                 return 0;
3112         update_changeattr(dir, &res->cinfo);
3113         return 1;
3114 }
3115
3116 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3117 {
3118         struct nfs_server *server = NFS_SERVER(dir);
3119         struct nfs_renameargs *arg = msg->rpc_argp;
3120         struct nfs_renameres *res = msg->rpc_resp;
3121
3122         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3123         res->server = server;
3124         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3125 }
3126
3127 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3128 {
3129         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3130                         &data->args.seq_args,
3131                         &data->res.seq_res,
3132                         task);
3133 }
3134
3135 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3136                                  struct inode *new_dir)
3137 {
3138         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3139
3140         if (!nfs4_sequence_done(task, &res->seq_res))
3141                 return 0;
3142         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3143                 return 0;
3144
3145         update_changeattr(old_dir, &res->old_cinfo);
3146         update_changeattr(new_dir, &res->new_cinfo);
3147         return 1;
3148 }
3149
3150 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3151                 struct inode *new_dir, struct qstr *new_name)
3152 {
3153         struct nfs_server *server = NFS_SERVER(old_dir);
3154         struct nfs_renameargs arg = {
3155                 .old_dir = NFS_FH(old_dir),
3156                 .new_dir = NFS_FH(new_dir),
3157                 .old_name = old_name,
3158                 .new_name = new_name,
3159         };
3160         struct nfs_renameres res = {
3161                 .server = server,
3162         };
3163         struct rpc_message msg = {
3164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3165                 .rpc_argp = &arg,
3166                 .rpc_resp = &res,
3167         };
3168         int status = -ENOMEM;
3169
3170         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3171         if (!status) {
3172                 update_changeattr(old_dir, &res.old_cinfo);
3173                 update_changeattr(new_dir, &res.new_cinfo);
3174         }
3175         return status;
3176 }
3177
3178 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3179                 struct inode *new_dir, struct qstr *new_name)
3180 {
3181         struct nfs4_exception exception = { };
3182         int err;
3183         do {
3184                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3185                                 _nfs4_proc_rename(old_dir, old_name,
3186                                         new_dir, new_name),
3187                                 &exception);
3188         } while (exception.retry);
3189         return err;
3190 }
3191
3192 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3193 {
3194         struct nfs_server *server = NFS_SERVER(inode);
3195         struct nfs4_link_arg arg = {
3196                 .fh     = NFS_FH(inode),
3197                 .dir_fh = NFS_FH(dir),
3198                 .name   = name,
3199                 .bitmask = server->attr_bitmask,
3200         };
3201         struct nfs4_link_res res = {
3202                 .server = server,
3203         };
3204         struct rpc_message msg = {
3205                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3206                 .rpc_argp = &arg,
3207                 .rpc_resp = &res,
3208         };
3209         int status = -ENOMEM;
3210
3211         res.fattr = nfs_alloc_fattr();
3212         if (res.fattr == NULL)
3213                 goto out;
3214
3215         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3216         if (!status) {
3217                 update_changeattr(dir, &res.cinfo);
3218                 nfs_post_op_update_inode(inode, res.fattr);
3219         }
3220 out:
3221         nfs_free_fattr(res.fattr);
3222         return status;
3223 }
3224
3225 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3226 {
3227         struct nfs4_exception exception = { };
3228         int err;
3229         do {
3230                 err = nfs4_handle_exception(NFS_SERVER(inode),
3231                                 _nfs4_proc_link(inode, dir, name),
3232                                 &exception);
3233         } while (exception.retry);
3234         return err;
3235 }
3236
3237 struct nfs4_createdata {
3238         struct rpc_message msg;
3239         struct nfs4_create_arg arg;
3240         struct nfs4_create_res res;
3241         struct nfs_fh fh;
3242         struct nfs_fattr fattr;
3243 };
3244
3245 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3246                 struct qstr *name, struct iattr *sattr, u32 ftype)
3247 {
3248         struct nfs4_createdata *data;
3249
3250         data = kzalloc(sizeof(*data), GFP_KERNEL);
3251         if (data != NULL) {
3252                 struct nfs_server *server = NFS_SERVER(dir);
3253
3254                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3255                 data->msg.rpc_argp = &data->arg;
3256                 data->msg.rpc_resp = &data->res;
3257                 data->arg.dir_fh = NFS_FH(dir);
3258                 data->arg.server = server;
3259                 data->arg.name = name;
3260                 data->arg.attrs = sattr;
3261                 data->arg.ftype = ftype;
3262                 data->arg.bitmask = server->attr_bitmask;
3263                 data->res.server = server;
3264                 data->res.fh = &data->fh;
3265                 data->res.fattr = &data->fattr;
3266                 nfs_fattr_init(data->res.fattr);
3267         }
3268         return data;
3269 }
3270
3271 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3272 {
3273         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3274                                     &data->arg.seq_args, &data->res.seq_res, 1);
3275         if (status == 0) {
3276                 update_changeattr(dir, &data->res.dir_cinfo);
3277                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3278         }
3279         return status;
3280 }
3281
3282 static void nfs4_free_createdata(struct nfs4_createdata *data)
3283 {
3284         kfree(data);
3285 }
3286
3287 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3288                 struct page *page, unsigned int len, struct iattr *sattr)
3289 {
3290         struct nfs4_createdata *data;
3291         int status = -ENAMETOOLONG;
3292
3293         if (len > NFS4_MAXPATHLEN)
3294                 goto out;
3295
3296         status = -ENOMEM;
3297         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3298         if (data == NULL)
3299                 goto out;
3300
3301         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3302         data->arg.u.symlink.pages = &page;
3303         data->arg.u.symlink.len = len;
3304
3305         status = nfs4_do_create(dir, dentry, data);
3306
3307         nfs4_free_createdata(data);
3308 out:
3309         return status;
3310 }
3311
3312 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3313                 struct page *page, unsigned int len, struct iattr *sattr)
3314 {
3315         struct nfs4_exception exception = { };
3316         int err;
3317         do {
3318                 err = nfs4_handle_exception(NFS_SERVER(dir),
3319                                 _nfs4_proc_symlink(dir, dentry, page,
3320                                                         len, sattr),
3321                                 &exception);
3322         } while (exception.retry);
3323         return err;
3324 }
3325
3326 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3327                 struct iattr *sattr)
3328 {
3329         struct nfs4_createdata *data;
3330         int status = -ENOMEM;
3331
3332         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3333         if (data == NULL)
3334                 goto out;
3335
3336         status = nfs4_do_create(dir, dentry, data);
3337
3338         nfs4_free_createdata(data);
3339 out:
3340         return status;
3341 }
3342
3343 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3344                 struct iattr *sattr)
3345 {
3346         struct nfs4_exception exception = { };
3347         int err;
3348
3349         sattr->ia_mode &= ~current_umask();
3350         do {
3351                 err = nfs4_handle_exception(NFS_SERVER(dir),
3352                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3353                                 &exception);
3354         } while (exception.retry);
3355         return err;
3356 }
3357
3358 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3359                 u64 cookie, struct page **pages, unsigned int count, int plus)
3360 {
3361         struct inode            *dir = dentry->d_inode;
3362         struct nfs4_readdir_arg args = {
3363                 .fh = NFS_FH(dir),
3364                 .pages = pages,
3365                 .pgbase = 0,
3366                 .count = count,
3367                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3368                 .plus = plus,
3369         };
3370         struct nfs4_readdir_res res;
3371         struct rpc_message msg = {
3372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3373                 .rpc_argp = &args,
3374                 .rpc_resp = &res,
3375                 .rpc_cred = cred,
3376         };
3377         int                     status;
3378
3379         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3380                         dentry->d_parent->d_name.name,
3381                         dentry->d_name.name,
3382                         (unsigned long long)cookie);
3383         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3384         res.pgbase = args.pgbase;
3385         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3386         if (status >= 0) {
3387                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3388                 status += args.pgbase;
3389         }
3390
3391         nfs_invalidate_atime(dir);
3392
3393         dprintk("%s: returns %d\n", __func__, status);
3394         return status;
3395 }
3396
3397 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3398                 u64 cookie, struct page **pages, unsigned int count, int plus)
3399 {
3400         struct nfs4_exception exception = { };
3401         int err;
3402         do {
3403                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3404                                 _nfs4_proc_readdir(dentry, cred, cookie,
3405                                         pages, count, plus),
3406                                 &exception);
3407         } while (exception.retry);
3408         return err;
3409 }
3410
3411 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3412                 struct iattr *sattr, dev_t rdev)
3413 {
3414         struct nfs4_createdata *data;
3415         int mode = sattr->ia_mode;
3416         int status = -ENOMEM;
3417
3418         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3419         if (data == NULL)
3420                 goto out;
3421
3422         if (S_ISFIFO(mode))
3423                 data->arg.ftype = NF4FIFO;
3424         else if (S_ISBLK(mode)) {
3425                 data->arg.ftype = NF4BLK;
3426                 data->arg.u.device.specdata1 = MAJOR(rdev);
3427                 data->arg.u.device.specdata2 = MINOR(rdev);
3428         }
3429         else if (S_ISCHR(mode)) {
3430                 data->arg.ftype = NF4CHR;
3431                 data->arg.u.device.specdata1 = MAJOR(rdev);
3432                 data->arg.u.device.specdata2 = MINOR(rdev);
3433         } else if (!S_ISSOCK(mode)) {
3434                 status = -EINVAL;
3435                 goto out_free;
3436         }
3437
3438         status = nfs4_do_create(dir, dentry, data);
3439 out_free:
3440         nfs4_free_createdata(data);
3441 out:
3442         return status;
3443 }
3444
3445 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3446                 struct iattr *sattr, dev_t rdev)
3447 {
3448         struct nfs4_exception exception = { };
3449         int err;
3450
3451         sattr->ia_mode &= ~current_umask();
3452         do {
3453                 err = nfs4_handle_exception(NFS_SERVER(dir),
3454                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3455                                 &exception);
3456         } while (exception.retry);
3457         return err;
3458 }
3459
3460 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3461                  struct nfs_fsstat *fsstat)
3462 {
3463         struct nfs4_statfs_arg args = {
3464                 .fh = fhandle,
3465                 .bitmask = server->attr_bitmask,
3466         };
3467         struct nfs4_statfs_res res = {
3468                 .fsstat = fsstat,
3469         };
3470         struct rpc_message msg = {
3471                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3472                 .rpc_argp = &args,
3473                 .rpc_resp = &res,
3474         };
3475
3476         nfs_fattr_init(fsstat->fattr);
3477         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3478 }
3479
3480 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3481 {
3482         struct nfs4_exception exception = { };
3483         int err;
3484         do {
3485                 err = nfs4_handle_exception(server,
3486                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3487                                 &exception);
3488         } while (exception.retry);
3489         return err;
3490 }
3491
3492 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3493                 struct nfs_fsinfo *fsinfo)
3494 {
3495         struct nfs4_fsinfo_arg args = {
3496                 .fh = fhandle,
3497                 .bitmask = server->attr_bitmask,
3498         };
3499         struct nfs4_fsinfo_res res = {
3500                 .fsinfo = fsinfo,
3501         };
3502         struct rpc_message msg = {
3503                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3504                 .rpc_argp = &args,
3505                 .rpc_resp = &res,
3506         };
3507
3508         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3509 }
3510
3511 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3512 {
3513         struct nfs4_exception exception = { };
3514         unsigned long now = jiffies;
3515         int err;
3516
3517         do {
3518                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3519                 if (err == 0) {
3520                         struct nfs_client *clp = server->nfs_client;
3521
3522                         spin_lock(&clp->cl_lock);
3523                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3524                         clp->cl_last_renewal = now;
3525                         spin_unlock(&clp->cl_lock);
3526                         break;
3527                 }
3528                 err = nfs4_handle_exception(server, err, &exception);
3529         } while (exception.retry);
3530         return err;
3531 }
3532
3533 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3534 {
3535         int error;
3536
3537         nfs_fattr_init(fsinfo->fattr);
3538         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3539         if (error == 0) {
3540                 /* block layout checks this! */
3541                 server->pnfs_blksize = fsinfo->blksize;
3542                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3543         }
3544
3545         return error;
3546 }
3547
3548 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3549                 struct nfs_pathconf *pathconf)
3550 {
3551         struct nfs4_pathconf_arg args = {
3552                 .fh = fhandle,
3553                 .bitmask = server->attr_bitmask,
3554         };
3555         struct nfs4_pathconf_res res = {
3556                 .pathconf = pathconf,
3557         };
3558         struct rpc_message msg = {
3559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3560                 .rpc_argp = &args,
3561                 .rpc_resp = &res,
3562         };
3563
3564         /* None of the pathconf attributes are mandatory to implement */
3565         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3566                 memset(pathconf, 0, sizeof(*pathconf));
3567                 return 0;
3568         }
3569
3570         nfs_fattr_init(pathconf->fattr);
3571         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3572 }
3573
3574 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3575                 struct nfs_pathconf *pathconf)
3576 {
3577         struct nfs4_exception exception = { };
3578         int err;
3579
3580         do {
3581                 err = nfs4_handle_exception(server,
3582                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3583                                 &exception);
3584         } while (exception.retry);
3585         return err;
3586 }
3587
3588 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3589                 const struct nfs_open_context *ctx,
3590                 const struct nfs_lock_context *l_ctx,
3591                 fmode_t fmode)
3592 {
3593         const struct nfs_lockowner *lockowner = NULL;
3594
3595         if (l_ctx != NULL)
3596                 lockowner = &l_ctx->lockowner;
3597         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3598 }
3599 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3600
3601 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3602                 const struct nfs_open_context *ctx,
3603                 const struct nfs_lock_context *l_ctx,
3604                 fmode_t fmode)
3605 {
3606         nfs4_stateid current_stateid;
3607
3608         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3609                 return false;
3610         return nfs4_stateid_match(stateid, &current_stateid);
3611 }
3612
3613 static bool nfs4_error_stateid_expired(int err)
3614 {
3615         switch (err) {
3616         case -NFS4ERR_DELEG_REVOKED:
3617         case -NFS4ERR_ADMIN_REVOKED:
3618         case -NFS4ERR_BAD_STATEID:
3619         case -NFS4ERR_STALE_STATEID:
3620         case -NFS4ERR_OLD_STATEID:
3621         case -NFS4ERR_OPENMODE:
3622         case -NFS4ERR_EXPIRED:
3623                 return true;
3624         }
3625         return false;
3626 }
3627
3628 void __nfs4_read_done_cb(struct nfs_read_data *data)
3629 {
3630         nfs_invalidate_atime(data->header->inode);
3631 }
3632
3633 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3634 {
3635         struct nfs_server *server = NFS_SERVER(data->header->inode);
3636
3637         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3638                 rpc_restart_call_prepare(task);
3639                 return -EAGAIN;
3640         }
3641
3642         __nfs4_read_done_cb(data);
3643         if (task->tk_status > 0)
3644                 renew_lease(server, data->timestamp);
3645         return 0;
3646 }
3647
3648 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3649                 struct nfs_readargs *args)
3650 {
3651
3652         if (!nfs4_error_stateid_expired(task->tk_status) ||
3653                 nfs4_stateid_is_current(&args->stateid,
3654                                 args->context,
3655                                 args->lock_context,
3656                                 FMODE_READ))
3657                 return false;
3658         rpc_restart_call_prepare(task);
3659         return true;
3660 }
3661
3662 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3663 {
3664
3665         dprintk("--> %s\n", __func__);
3666
3667         if (!nfs4_sequence_done(task, &data->res.seq_res))
3668                 return -EAGAIN;
3669         if (nfs4_read_stateid_changed(task, &data->args))
3670                 return -EAGAIN;
3671         return data->read_done_cb ? data->read_done_cb(task, data) :
3672                                     nfs4_read_done_cb(task, data);
3673 }
3674
3675 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3676 {
3677         data->timestamp   = jiffies;
3678         data->read_done_cb = nfs4_read_done_cb;
3679         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3680         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3681 }
3682
3683 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3684 {
3685         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3686                         &data->args.seq_args,
3687                         &data->res.seq_res,
3688                         task))
3689                 return;
3690         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3691                         data->args.lock_context, FMODE_READ);
3692 }
3693
3694 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3695 {
3696         struct inode *inode = data->header->inode;
3697
3698         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3699                 rpc_restart_call_prepare(task);
3700                 return -EAGAIN;
3701         }
3702         if (task->tk_status >= 0) {
3703                 renew_lease(NFS_SERVER(inode), data->timestamp);
3704                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3705         }
3706         return 0;
3707 }
3708
3709 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3710                 struct nfs_writeargs *args)
3711 {
3712
3713         if (!nfs4_error_stateid_expired(task->tk_status) ||
3714                 nfs4_stateid_is_current(&args->stateid,
3715                                 args->context,
3716                                 args->lock_context,
3717                                 FMODE_WRITE))
3718                 return false;
3719         rpc_restart_call_prepare(task);
3720         return true;
3721 }
3722
3723 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3724 {
3725         if (!nfs4_sequence_done(task, &data->res.seq_res))
3726                 return -EAGAIN;
3727         if (nfs4_write_stateid_changed(task, &data->args))
3728                 return -EAGAIN;
3729         return data->write_done_cb ? data->write_done_cb(task, data) :
3730                 nfs4_write_done_cb(task, data);
3731 }
3732
3733 static
3734 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3735 {
3736         const struct nfs_pgio_header *hdr = data->header;
3737
3738         /* Don't request attributes for pNFS or O_DIRECT writes */
3739         if (data->ds_clp != NULL || hdr->dreq != NULL)
3740                 return false;
3741         /* Otherwise, request attributes if and only if we don't hold
3742          * a delegation
3743          */
3744         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3745 }
3746
3747 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3748 {
3749         struct nfs_server *server = NFS_SERVER(data->header->inode);
3750
3751         if (!nfs4_write_need_cache_consistency_data(data)) {
3752                 data->args.bitmask = NULL;
3753                 data->res.fattr = NULL;
3754         } else
3755                 data->args.bitmask = server->cache_consistency_bitmask;
3756
3757         if (!data->write_done_cb)
3758                 data->write_done_cb = nfs4_write_done_cb;
3759         data->res.server = server;
3760         data->timestamp   = jiffies;
3761
3762         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3763         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3764 }
3765
3766 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3767 {
3768         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3769                         &data->args.seq_args,
3770                         &data->res.seq_res,
3771                         task))
3772                 return;
3773         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3774                         data->args.lock_context, FMODE_WRITE);
3775 }
3776
3777 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3778 {
3779         nfs4_setup_sequence(NFS_SERVER(data->inode),
3780                         &data->args.seq_args,
3781                         &data->res.seq_res,
3782                         task);
3783 }
3784
3785 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3786 {
3787         struct inode *inode = data->inode;
3788
3789         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3790                 rpc_restart_call_prepare(task);
3791                 return -EAGAIN;
3792         }
3793         return 0;
3794 }
3795
3796 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3797 {
3798         if (!nfs4_sequence_done(task, &data->res.seq_res))
3799                 return -EAGAIN;
3800         return data->commit_done_cb(task, data);
3801 }
3802
3803 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3804 {
3805         struct nfs_server *server = NFS_SERVER(data->inode);
3806
3807         if (data->commit_done_cb == NULL)
3808                 data->commit_done_cb = nfs4_commit_done_cb;
3809         data->res.server = server;
3810         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3811         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3812 }
3813
3814 struct nfs4_renewdata {
3815         struct nfs_client       *client;
3816         unsigned long           timestamp;
3817 };
3818
3819 /*
3820  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3821  * standalone procedure for queueing an asynchronous RENEW.
3822  */
3823 static void nfs4_renew_release(void *calldata)
3824 {
3825         struct nfs4_renewdata *data = calldata;
3826         struct nfs_client *clp = data->client;
3827
3828         if (atomic_read(&clp->cl_count) > 1)
3829                 nfs4_schedule_state_renewal(clp);
3830         nfs_put_client(clp);
3831         kfree(data);
3832 }
3833
3834 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3835 {
3836         struct nfs4_renewdata *data = calldata;
3837         struct nfs_client *clp = data->client;
3838         unsigned long timestamp = data->timestamp;
3839
3840         if (task->tk_status < 0) {
3841                 /* Unless we're shutting down, schedule state recovery! */
3842                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3843                         return;
3844                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3845                         nfs4_schedule_lease_recovery(clp);
3846                         return;
3847                 }
3848                 nfs4_schedule_path_down_recovery(clp);
3849         }
3850         do_renew_lease(clp, timestamp);
3851 }
3852
3853 static const struct rpc_call_ops nfs4_renew_ops = {
3854         .rpc_call_done = nfs4_renew_done,
3855         .rpc_release = nfs4_renew_release,
3856 };
3857
3858 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3859 {
3860         struct rpc_message msg = {
3861                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3862                 .rpc_argp       = clp,
3863                 .rpc_cred       = cred,
3864         };
3865         struct nfs4_renewdata *data;
3866
3867         if (renew_flags == 0)
3868                 return 0;
3869         if (!atomic_inc_not_zero(&clp->cl_count))
3870                 return -EIO;
3871         data = kmalloc(sizeof(*data), GFP_NOFS);
3872         if (data == NULL)
3873                 return -ENOMEM;
3874         data->client = clp;
3875         data->timestamp = jiffies;
3876         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
3877                         &nfs4_renew_ops, data);
3878 }
3879
3880 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3881 {
3882         struct rpc_message msg = {
3883                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3884                 .rpc_argp       = clp,
3885                 .rpc_cred       = cred,
3886         };
3887         unsigned long now = jiffies;
3888         int status;
3889
3890         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3891         if (status < 0)
3892                 return status;
3893         do_renew_lease(clp, now);
3894         return 0;
3895 }
3896
3897 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3898 {
3899         return (server->caps & NFS_CAP_ACLS)
3900                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3901                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3902 }
3903
3904 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3905  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3906  * the stack.
3907  */
3908 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3909
3910 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3911                 struct page **pages, unsigned int *pgbase)
3912 {
3913         struct page *newpage, **spages;
3914         int rc = 0;
3915         size_t len;
3916         spages = pages;
3917
3918         do {
3919                 len = min_t(size_t, PAGE_SIZE, buflen);
3920                 newpage = alloc_page(GFP_KERNEL);
3921
3922                 if (newpage == NULL)
3923                         goto unwind;
3924                 memcpy(page_address(newpage), buf, len);
3925                 buf += len;
3926                 buflen -= len;
3927                 *pages++ = newpage;
3928                 rc++;
3929         } while (buflen != 0);
3930
3931         return rc;
3932
3933 unwind:
3934         for(; rc > 0; rc--)
3935                 __free_page(spages[rc-1]);
3936         return -ENOMEM;
3937 }
3938
3939 struct nfs4_cached_acl {
3940         int cached;
3941         size_t len;
3942         char data[0];
3943 };
3944
3945 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3946 {
3947         struct nfs_inode *nfsi = NFS_I(inode);
3948
3949         spin_lock(&inode->i_lock);
3950         kfree(nfsi->nfs4_acl);
3951         nfsi->nfs4_acl = acl;
3952         spin_unlock(&inode->i_lock);
3953 }
3954
3955 static void nfs4_zap_acl_attr(struct inode *inode)
3956 {
3957         nfs4_set_cached_acl(inode, NULL);
3958 }
3959
3960 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3961 {
3962         struct nfs_inode *nfsi = NFS_I(inode);
3963         struct nfs4_cached_acl *acl;
3964         int ret = -ENOENT;
3965
3966         spin_lock(&inode->i_lock);
3967         acl = nfsi->nfs4_acl;
3968         if (acl == NULL)
3969                 goto out;
3970         if (buf == NULL) /* user is just asking for length */
3971                 goto out_len;
3972         if (acl->cached == 0)
3973                 goto out;
3974         ret = -ERANGE; /* see getxattr(2) man page */
3975         if (acl->len > buflen)
3976                 goto out;
3977         memcpy(buf, acl->data, acl->len);
3978 out_len:
3979         ret = acl->len;
3980 out:
3981         spin_unlock(&inode->i_lock);
3982         return ret;
3983 }
3984
3985 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3986 {
3987         struct nfs4_cached_acl *acl;
3988         size_t buflen = sizeof(*acl) + acl_len;
3989
3990         if (buflen <= PAGE_SIZE) {
3991                 acl = kmalloc(buflen, GFP_KERNEL);
3992                 if (acl == NULL)
3993                         goto out;
3994                 acl->cached = 1;
3995                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3996         } else {
3997                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3998                 if (acl == NULL)
3999                         goto out;
4000                 acl->cached = 0;
4001         }
4002         acl->len = acl_len;
4003 out:
4004         nfs4_set_cached_acl(inode, acl);
4005 }
4006
4007 /*
4008  * The getxattr API returns the required buffer length when called with a
4009  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4010  * the required buf.  On a NULL buf, we send a page of data to the server
4011  * guessing that the ACL request can be serviced by a page. If so, we cache
4012  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4013  * the cache. If not so, we throw away the page, and cache the required
4014  * length. The next getxattr call will then produce another round trip to
4015  * the server, this time with the input buf of the required size.
4016  */
4017 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4018 {
4019         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4020         struct nfs_getaclargs args = {
4021                 .fh = NFS_FH(inode),
4022                 .acl_pages = pages,
4023                 .acl_len = buflen,
4024         };
4025         struct nfs_getaclres res = {
4026                 .acl_len = buflen,
4027         };
4028         struct rpc_message msg = {
4029                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4030                 .rpc_argp = &args,
4031                 .rpc_resp = &res,
4032         };
4033         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4034         int ret = -ENOMEM, i;
4035
4036         /* As long as we're doing a round trip to the server anyway,
4037          * let's be prepared for a page of acl data. */
4038         if (npages == 0)
4039                 npages = 1;
4040         if (npages > ARRAY_SIZE(pages))
4041                 return -ERANGE;
4042
4043         for (i = 0; i < npages; i++) {
4044                 pages[i] = alloc_page(GFP_KERNEL);
4045                 if (!pages[i])
4046                         goto out_free;
4047         }
4048
4049         /* for decoding across pages */
4050         res.acl_scratch = alloc_page(GFP_KERNEL);
4051         if (!res.acl_scratch)
4052                 goto out_free;
4053
4054         args.acl_len = npages * PAGE_SIZE;
4055         args.acl_pgbase = 0;
4056
4057         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4058                 __func__, buf, buflen, npages, args.acl_len);
4059         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4060                              &msg, &args.seq_args, &res.seq_res, 0);
4061         if (ret)
4062                 goto out_free;
4063
4064         /* Handle the case where the passed-in buffer is too short */
4065         if (res.acl_flags & NFS4_ACL_TRUNC) {
4066                 /* Did the user only issue a request for the acl length? */
4067                 if (buf == NULL)
4068                         goto out_ok;
4069                 ret = -ERANGE;
4070                 goto out_free;
4071         }
4072         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4073         if (buf) {
4074                 if (res.acl_len > buflen) {
4075                         ret = -ERANGE;
4076                         goto out_free;
4077                 }
4078                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4079         }
4080 out_ok:
4081         ret = res.acl_len;
4082 out_free:
4083         for (i = 0; i < npages; i++)
4084                 if (pages[i])
4085                         __free_page(pages[i]);
4086         if (res.acl_scratch)
4087                 __free_page(res.acl_scratch);
4088         return ret;
4089 }
4090
4091 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4092 {
4093         struct nfs4_exception exception = { };
4094         ssize_t ret;
4095         do {
4096                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4097                 if (ret >= 0)
4098                         break;
4099                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4100         } while (exception.retry);
4101         return ret;
4102 }
4103
4104 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4105 {
4106         struct nfs_server *server = NFS_SERVER(inode);
4107         int ret;
4108
4109         if (!nfs4_server_supports_acls(server))
4110                 return -EOPNOTSUPP;
4111         ret = nfs_revalidate_inode(server, inode);
4112         if (ret < 0)
4113                 return ret;
4114         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4115                 nfs_zap_acl_cache(inode);
4116         ret = nfs4_read_cached_acl(inode, buf, buflen);
4117         if (ret != -ENOENT)
4118                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4119                  * but no cached acl data, just the acl length */
4120                 return ret;
4121         return nfs4_get_acl_uncached(inode, buf, buflen);
4122 }
4123
4124 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4125 {
4126         struct nfs_server *server = NFS_SERVER(inode);
4127         struct page *pages[NFS4ACL_MAXPAGES];
4128         struct nfs_setaclargs arg = {
4129                 .fh             = NFS_FH(inode),
4130                 .acl_pages      = pages,
4131                 .acl_len        = buflen,
4132         };
4133         struct nfs_setaclres res;
4134         struct rpc_message msg = {
4135                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4136                 .rpc_argp       = &arg,
4137                 .rpc_resp       = &res,
4138         };
4139         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4140         int ret, i;
4141
4142         if (!nfs4_server_supports_acls(server))
4143                 return -EOPNOTSUPP;
4144         if (npages > ARRAY_SIZE(pages))
4145                 return -ERANGE;
4146         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4147         if (i < 0)
4148                 return i;
4149         nfs4_inode_return_delegation(inode);
4150         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4151
4152         /*
4153          * Free each page after tx, so the only ref left is
4154          * held by the network stack
4155          */
4156         for (; i > 0; i--)
4157                 put_page(pages[i-1]);
4158
4159         /*
4160          * Acl update can result in inode attribute update.
4161          * so mark the attribute cache invalid.
4162          */
4163         spin_lock(&inode->i_lock);
4164         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4165         spin_unlock(&inode->i_lock);
4166         nfs_access_zap_cache(inode);
4167         nfs_zap_acl_cache(inode);
4168         return ret;
4169 }
4170
4171 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4172 {
4173         struct nfs4_exception exception = { };
4174         int err;
4175         do {
4176                 err = nfs4_handle_exception(NFS_SERVER(inode),
4177                                 __nfs4_proc_set_acl(inode, buf, buflen),
4178                                 &exception);
4179         } while (exception.retry);
4180         return err;
4181 }
4182
4183 static int
4184 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4185 {
4186         struct nfs_client *clp = server->nfs_client;
4187
4188         if (task->tk_status >= 0)
4189                 return 0;
4190         switch(task->tk_status) {
4191                 case -NFS4ERR_DELEG_REVOKED:
4192                 case -NFS4ERR_ADMIN_REVOKED:
4193                 case -NFS4ERR_BAD_STATEID:
4194                         if (state == NULL)
4195                                 break;
4196                         nfs_remove_bad_delegation(state->inode);
4197                 case -NFS4ERR_OPENMODE:
4198                         if (state == NULL)
4199                                 break;
4200                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4201                                 goto stateid_invalid;
4202                         goto wait_on_recovery;
4203                 case -NFS4ERR_EXPIRED:
4204                         if (state != NULL) {
4205                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4206                                         goto stateid_invalid;
4207                         }
4208                 case -NFS4ERR_STALE_STATEID:
4209                 case -NFS4ERR_STALE_CLIENTID:
4210                         nfs4_schedule_lease_recovery(clp);
4211                         goto wait_on_recovery;
4212 #if defined(CONFIG_NFS_V4_1)
4213                 case -NFS4ERR_BADSESSION:
4214                 case -NFS4ERR_BADSLOT:
4215                 case -NFS4ERR_BAD_HIGH_SLOT:
4216                 case -NFS4ERR_DEADSESSION:
4217                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4218                 case -NFS4ERR_SEQ_FALSE_RETRY:
4219                 case -NFS4ERR_SEQ_MISORDERED:
4220                         dprintk("%s ERROR %d, Reset session\n", __func__,
4221                                 task->tk_status);
4222                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4223                         task->tk_status = 0;
4224                         return -EAGAIN;
4225 #endif /* CONFIG_NFS_V4_1 */
4226                 case -NFS4ERR_DELAY:
4227                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4228                 case -NFS4ERR_GRACE:
4229                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4230                         task->tk_status = 0;
4231                         return -EAGAIN;
4232                 case -NFS4ERR_RETRY_UNCACHED_REP:
4233                 case -NFS4ERR_OLD_STATEID:
4234                         task->tk_status = 0;
4235                         return -EAGAIN;
4236         }
4237         task->tk_status = nfs4_map_errors(task->tk_status);
4238         return 0;
4239 stateid_invalid:
4240         task->tk_status = -EIO;
4241         return 0;
4242 wait_on_recovery:
4243         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4244         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4245                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4246         task->tk_status = 0;
4247         return -EAGAIN;
4248 }
4249
4250 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4251                                     nfs4_verifier *bootverf)
4252 {
4253         __be32 verf[2];
4254
4255         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4256                 /* An impossible timestamp guarantees this value
4257                  * will never match a generated boot time. */
4258                 verf[0] = 0;
4259                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4260         } else {
4261                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4262                 verf[0] = (__be32)nn->boot_time.tv_sec;
4263                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4264         }
4265         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4266 }
4267
4268 static unsigned int
4269 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4270                                    char *buf, size_t len)
4271 {
4272         unsigned int result;
4273
4274         rcu_read_lock();
4275         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4276                                 clp->cl_ipaddr,
4277                                 rpc_peeraddr2str(clp->cl_rpcclient,
4278                                                         RPC_DISPLAY_ADDR),
4279                                 rpc_peeraddr2str(clp->cl_rpcclient,
4280                                                         RPC_DISPLAY_PROTO));
4281         rcu_read_unlock();
4282         return result;
4283 }
4284
4285 static unsigned int
4286 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4287                                 char *buf, size_t len)
4288 {
4289         char *nodename = clp->cl_rpcclient->cl_nodename;
4290
4291         if (nfs4_client_id_uniquifier[0] != '\0')
4292                 nodename = nfs4_client_id_uniquifier;
4293         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4294                                 clp->rpc_ops->version, clp->cl_minorversion,
4295                                 nodename);
4296 }
4297
4298 /**
4299  * nfs4_proc_setclientid - Negotiate client ID
4300  * @clp: state data structure
4301  * @program: RPC program for NFSv4 callback service
4302  * @port: IP port number for NFS4 callback service
4303  * @cred: RPC credential to use for this call
4304  * @res: where to place the result
4305  *
4306  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4307  */
4308 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4309                 unsigned short port, struct rpc_cred *cred,
4310                 struct nfs4_setclientid_res *res)
4311 {
4312         nfs4_verifier sc_verifier;
4313         struct nfs4_setclientid setclientid = {
4314                 .sc_verifier = &sc_verifier,
4315                 .sc_prog = program,
4316                 .sc_cb_ident = clp->cl_cb_ident,
4317         };
4318         struct rpc_message msg = {
4319                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4320                 .rpc_argp = &setclientid,
4321                 .rpc_resp = res,
4322                 .rpc_cred = cred,
4323         };
4324         int status;
4325
4326         /* nfs_client_id4 */
4327         nfs4_init_boot_verifier(clp, &sc_verifier);
4328         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4329                 setclientid.sc_name_len =
4330                                 nfs4_init_uniform_client_string(clp,
4331                                                 setclientid.sc_name,
4332                                                 sizeof(setclientid.sc_name));
4333         else
4334                 setclientid.sc_name_len =
4335                                 nfs4_init_nonuniform_client_string(clp,
4336                                                 setclientid.sc_name,
4337                                                 sizeof(setclientid.sc_name));
4338         /* cb_client4 */
4339         rcu_read_lock();
4340         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4341                                 sizeof(setclientid.sc_netid),
4342                                 rpc_peeraddr2str(clp->cl_rpcclient,
4343                                                         RPC_DISPLAY_NETID));
4344         rcu_read_unlock();
4345         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4346                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4347                                 clp->cl_ipaddr, port >> 8, port & 255);
4348
4349         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4350                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4351                 setclientid.sc_name_len, setclientid.sc_name);
4352         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4353         dprintk("NFS reply setclientid: %d\n", status);
4354         return status;
4355 }
4356
4357 /**
4358  * nfs4_proc_setclientid_confirm - Confirm client ID
4359  * @clp: state data structure
4360  * @res: result of a previous SETCLIENTID
4361  * @cred: RPC credential to use for this call
4362  *
4363  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4364  */
4365 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4366                 struct nfs4_setclientid_res *arg,
4367                 struct rpc_cred *cred)
4368 {
4369         struct rpc_message msg = {
4370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4371                 .rpc_argp = arg,
4372                 .rpc_cred = cred,
4373         };
4374         int status;
4375
4376         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4377                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4378                 clp->cl_clientid);
4379         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4380         dprintk("NFS reply setclientid_confirm: %d\n", status);
4381         return status;
4382 }
4383
4384 struct nfs4_delegreturndata {
4385         struct nfs4_delegreturnargs args;
4386         struct nfs4_delegreturnres res;
4387         struct nfs_fh fh;
4388         nfs4_stateid stateid;
4389         unsigned long timestamp;
4390         struct nfs_fattr fattr;
4391         int rpc_status;
4392 };
4393
4394 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4395 {
4396         struct nfs4_delegreturndata *data = calldata;
4397
4398         if (!nfs4_sequence_done(task, &data->res.seq_res))
4399                 return;
4400
4401         switch (task->tk_status) {
4402         case -NFS4ERR_STALE_STATEID:
4403         case -NFS4ERR_EXPIRED:
4404         case 0:
4405                 renew_lease(data->res.server, data->timestamp);
4406                 break;
4407         default:
4408                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4409                                 -EAGAIN) {
4410                         rpc_restart_call_prepare(task);
4411                         return;
4412                 }
4413         }
4414         data->rpc_status = task->tk_status;
4415 }
4416
4417 static void nfs4_delegreturn_release(void *calldata)
4418 {
4419         kfree(calldata);
4420 }
4421
4422 #if defined(CONFIG_NFS_V4_1)
4423 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4424 {
4425         struct nfs4_delegreturndata *d_data;
4426
4427         d_data = (struct nfs4_delegreturndata *)data;
4428
4429         nfs4_setup_sequence(d_data->res.server,
4430                         &d_data->args.seq_args,
4431                         &d_data->res.seq_res,
4432                         task);
4433 }
4434 #endif /* CONFIG_NFS_V4_1 */
4435
4436 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4437 #if defined(CONFIG_NFS_V4_1)
4438         .rpc_call_prepare = nfs4_delegreturn_prepare,
4439 #endif /* CONFIG_NFS_V4_1 */
4440         .rpc_call_done = nfs4_delegreturn_done,
4441         .rpc_release = nfs4_delegreturn_release,
4442 };
4443
4444 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4445 {
4446         struct nfs4_delegreturndata *data;
4447         struct nfs_server *server = NFS_SERVER(inode);
4448         struct rpc_task *task;
4449         struct rpc_message msg = {
4450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4451                 .rpc_cred = cred,
4452         };
4453         struct rpc_task_setup task_setup_data = {
4454                 .rpc_client = server->client,
4455                 .rpc_message = &msg,
4456                 .callback_ops = &nfs4_delegreturn_ops,
4457                 .flags = RPC_TASK_ASYNC,
4458         };
4459         int status = 0;
4460
4461         data = kzalloc(sizeof(*data), GFP_NOFS);
4462         if (data == NULL)
4463                 return -ENOMEM;
4464         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4465         data->args.fhandle = &data->fh;
4466         data->args.stateid = &data->stateid;
4467         data->args.bitmask = server->cache_consistency_bitmask;
4468         nfs_copy_fh(&data->fh, NFS_FH(inode));
4469         nfs4_stateid_copy(&data->stateid, stateid);
4470         data->res.fattr = &data->fattr;
4471         data->res.server = server;
4472         nfs_fattr_init(data->res.fattr);
4473         data->timestamp = jiffies;
4474         data->rpc_status = 0;
4475
4476         task_setup_data.callback_data = data;
4477         msg.rpc_argp = &data->args;
4478         msg.rpc_resp = &data->res;
4479         task = rpc_run_task(&task_setup_data);
4480         if (IS_ERR(task))
4481                 return PTR_ERR(task);
4482         if (!issync)
4483                 goto out;
4484         status = nfs4_wait_for_completion_rpc_task(task);
4485         if (status != 0)
4486                 goto out;
4487         status = data->rpc_status;
4488         if (status == 0)
4489                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4490         else
4491                 nfs_refresh_inode(inode, &data->fattr);
4492 out:
4493         rpc_put_task(task);
4494         return status;
4495 }
4496
4497 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4498 {
4499         struct nfs_server *server = NFS_SERVER(inode);
4500         struct nfs4_exception exception = { };
4501         int err;
4502         do {
4503                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4504                 switch (err) {
4505                         case -NFS4ERR_STALE_STATEID:
4506                         case -NFS4ERR_EXPIRED:
4507                         case 0:
4508                                 return 0;
4509                 }
4510                 err = nfs4_handle_exception(server, err, &exception);
4511         } while (exception.retry);
4512         return err;
4513 }
4514
4515 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4516 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4517
4518 /*
4519  * sleep, with exponential backoff, and retry the LOCK operation.
4520  */
4521 static unsigned long
4522 nfs4_set_lock_task_retry(unsigned long timeout)
4523 {
4524         freezable_schedule_timeout_killable(timeout);
4525         timeout <<= 1;
4526         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4527                 return NFS4_LOCK_MAXTIMEOUT;
4528         return timeout;
4529 }
4530
4531 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4532 {
4533         struct inode *inode = state->inode;
4534         struct nfs_server *server = NFS_SERVER(inode);
4535         struct nfs_client *clp = server->nfs_client;
4536         struct nfs_lockt_args arg = {
4537                 .fh = NFS_FH(inode),
4538                 .fl = request,
4539         };
4540         struct nfs_lockt_res res = {
4541                 .denied = request,
4542         };
4543         struct rpc_message msg = {
4544                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4545                 .rpc_argp       = &arg,
4546                 .rpc_resp       = &res,
4547                 .rpc_cred       = state->owner->so_cred,
4548         };
4549         struct nfs4_lock_state *lsp;
4550         int status;
4551
4552         arg.lock_owner.clientid = clp->cl_clientid;
4553         status = nfs4_set_lock_state(state, request);
4554         if (status != 0)
4555                 goto out;
4556         lsp = request->fl_u.nfs4_fl.owner;
4557         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4558         arg.lock_owner.s_dev = server->s_dev;
4559         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4560         switch (status) {
4561                 case 0:
4562                         request->fl_type = F_UNLCK;
4563                         break;
4564                 case -NFS4ERR_DENIED:
4565                         status = 0;
4566         }
4567         request->fl_ops->fl_release_private(request);
4568 out:
4569         return status;
4570 }
4571
4572 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4573 {
4574         struct nfs4_exception exception = { };
4575         int err;
4576
4577         do {
4578                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4579                                 _nfs4_proc_getlk(state, cmd, request),
4580                                 &exception);
4581         } while (exception.retry);
4582         return err;
4583 }
4584
4585 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4586 {
4587         int res = 0;
4588         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4589                 case FL_POSIX:
4590                         res = posix_lock_file_wait(file, fl);
4591                         break;
4592                 case FL_FLOCK:
4593                         res = flock_lock_file_wait(file, fl);
4594                         break;
4595                 default:
4596                         BUG();
4597         }
4598         return res;
4599 }
4600
4601 struct nfs4_unlockdata {
4602         struct nfs_locku_args arg;
4603         struct nfs_locku_res res;
4604         struct nfs4_lock_state *lsp;
4605         struct nfs_open_context *ctx;
4606         struct file_lock fl;
4607         const struct nfs_server *server;
4608         unsigned long timestamp;
4609 };
4610
4611 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4612                 struct nfs_open_context *ctx,
4613                 struct nfs4_lock_state *lsp,
4614                 struct nfs_seqid *seqid)
4615 {
4616         struct nfs4_unlockdata *p;
4617         struct inode *inode = lsp->ls_state->inode;
4618
4619         p = kzalloc(sizeof(*p), GFP_NOFS);
4620         if (p == NULL)
4621                 return NULL;
4622         p->arg.fh = NFS_FH(inode);
4623         p->arg.fl = &p->fl;
4624         p->arg.seqid = seqid;
4625         p->res.seqid = seqid;
4626         p->arg.stateid = &lsp->ls_stateid;
4627         p->lsp = lsp;
4628         atomic_inc(&lsp->ls_count);
4629         /* Ensure we don't close file until we're done freeing locks! */
4630         p->ctx = get_nfs_open_context(ctx);
4631         memcpy(&p->fl, fl, sizeof(p->fl));
4632         p->server = NFS_SERVER(inode);
4633         return p;
4634 }
4635
4636 static void nfs4_locku_release_calldata(void *data)
4637 {
4638         struct nfs4_unlockdata *calldata = data;
4639         nfs_free_seqid(calldata->arg.seqid);
4640         nfs4_put_lock_state(calldata->lsp);
4641         put_nfs_open_context(calldata->ctx);
4642         kfree(calldata);
4643 }
4644
4645 static void nfs4_locku_done(struct rpc_task *task, void *data)
4646 {
4647         struct nfs4_unlockdata *calldata = data;
4648
4649         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4650                 return;
4651         switch (task->tk_status) {
4652                 case 0:
4653                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4654                                         &calldata->res.stateid);
4655                         renew_lease(calldata->server, calldata->timestamp);
4656                         break;
4657                 case -NFS4ERR_BAD_STATEID:
4658                 case -NFS4ERR_OLD_STATEID:
4659                 case -NFS4ERR_STALE_STATEID:
4660                 case -NFS4ERR_EXPIRED:
4661                         break;
4662                 default:
4663                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4664                                 rpc_restart_call_prepare(task);
4665         }
4666         nfs_release_seqid(calldata->arg.seqid);
4667 }
4668
4669 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4670 {
4671         struct nfs4_unlockdata *calldata = data;
4672
4673         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4674                 goto out_wait;
4675         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4676                 /* Note: exit _without_ running nfs4_locku_done */
4677                 goto out_no_action;
4678         }
4679         calldata->timestamp = jiffies;
4680         if (nfs4_setup_sequence(calldata->server,
4681                                 &calldata->arg.seq_args,
4682                                 &calldata->res.seq_res,
4683                                 task) != 0)
4684                 nfs_release_seqid(calldata->arg.seqid);
4685         return;
4686 out_no_action:
4687         task->tk_action = NULL;
4688 out_wait:
4689         nfs4_sequence_done(task, &calldata->res.seq_res);
4690 }
4691
4692 static const struct rpc_call_ops nfs4_locku_ops = {
4693         .rpc_call_prepare = nfs4_locku_prepare,
4694         .rpc_call_done = nfs4_locku_done,
4695         .rpc_release = nfs4_locku_release_calldata,
4696 };
4697
4698 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4699                 struct nfs_open_context *ctx,
4700                 struct nfs4_lock_state *lsp,
4701                 struct nfs_seqid *seqid)
4702 {
4703         struct nfs4_unlockdata *data;
4704         struct rpc_message msg = {
4705                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4706                 .rpc_cred = ctx->cred,
4707         };
4708         struct rpc_task_setup task_setup_data = {
4709                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4710                 .rpc_message = &msg,
4711                 .callback_ops = &nfs4_locku_ops,
4712                 .workqueue = nfsiod_workqueue,
4713                 .flags = RPC_TASK_ASYNC,
4714         };
4715
4716         /* Ensure this is an unlock - when canceling a lock, the
4717          * canceled lock is passed in, and it won't be an unlock.
4718          */
4719         fl->fl_type = F_UNLCK;
4720
4721         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4722         if (data == NULL) {
4723                 nfs_free_seqid(seqid);
4724                 return ERR_PTR(-ENOMEM);
4725         }
4726
4727         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4728         msg.rpc_argp = &data->arg;
4729         msg.rpc_resp = &data->res;
4730         task_setup_data.callback_data = data;
4731         return rpc_run_task(&task_setup_data);
4732 }
4733
4734 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4735 {
4736         struct inode *inode = state->inode;
4737         struct nfs4_state_owner *sp = state->owner;
4738         struct nfs_inode *nfsi = NFS_I(inode);
4739         struct nfs_seqid *seqid;
4740         struct nfs4_lock_state *lsp;
4741         struct rpc_task *task;
4742         int status = 0;
4743         unsigned char fl_flags = request->fl_flags;
4744
4745         status = nfs4_set_lock_state(state, request);
4746         /* Unlock _before_ we do the RPC call */
4747         request->fl_flags |= FL_EXISTS;
4748         /* Exclude nfs_delegation_claim_locks() */
4749         mutex_lock(&sp->so_delegreturn_mutex);
4750         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4751         down_read(&nfsi->rwsem);
4752         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4753                 up_read(&nfsi->rwsem);
4754                 mutex_unlock(&sp->so_delegreturn_mutex);
4755                 goto out;
4756         }
4757         up_read(&nfsi->rwsem);
4758         mutex_unlock(&sp->so_delegreturn_mutex);
4759         if (status != 0)
4760                 goto out;
4761         /* Is this a delegated lock? */
4762         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4763                 goto out;
4764         lsp = request->fl_u.nfs4_fl.owner;
4765         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4766         status = -ENOMEM;
4767         if (seqid == NULL)
4768                 goto out;
4769         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4770         status = PTR_ERR(task);
4771         if (IS_ERR(task))
4772                 goto out;
4773         status = nfs4_wait_for_completion_rpc_task(task);
4774         rpc_put_task(task);
4775 out:
4776         request->fl_flags = fl_flags;
4777         return status;
4778 }
4779
4780 struct nfs4_lockdata {
4781         struct nfs_lock_args arg;
4782         struct nfs_lock_res res;
4783         struct nfs4_lock_state *lsp;
4784         struct nfs_open_context *ctx;
4785         struct file_lock fl;
4786         unsigned long timestamp;
4787         int rpc_status;
4788         int cancelled;
4789         struct nfs_server *server;
4790 };
4791
4792 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4793                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4794                 gfp_t gfp_mask)
4795 {
4796         struct nfs4_lockdata *p;
4797         struct inode *inode = lsp->ls_state->inode;
4798         struct nfs_server *server = NFS_SERVER(inode);
4799
4800         p = kzalloc(sizeof(*p), gfp_mask);
4801         if (p == NULL)
4802                 return NULL;
4803
4804         p->arg.fh = NFS_FH(inode);
4805         p->arg.fl = &p->fl;
4806         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4807         if (p->arg.open_seqid == NULL)
4808                 goto out_free;
4809         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4810         if (p->arg.lock_seqid == NULL)
4811                 goto out_free_seqid;
4812         p->arg.lock_stateid = &lsp->ls_stateid;
4813         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4814         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4815         p->arg.lock_owner.s_dev = server->s_dev;
4816         p->res.lock_seqid = p->arg.lock_seqid;
4817         p->lsp = lsp;
4818         p->server = server;
4819         atomic_inc(&lsp->ls_count);
4820         p->ctx = get_nfs_open_context(ctx);
4821         memcpy(&p->fl, fl, sizeof(p->fl));
4822         return p;
4823 out_free_seqid:
4824         nfs_free_seqid(p->arg.open_seqid);
4825 out_free:
4826         kfree(p);
4827         return NULL;
4828 }
4829
4830 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4831 {
4832         struct nfs4_lockdata *data = calldata;
4833         struct nfs4_state *state = data->lsp->ls_state;
4834
4835         dprintk("%s: begin!\n", __func__);
4836         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4837                 goto out_wait;
4838         /* Do we need to do an open_to_lock_owner? */
4839         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4840                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4841                         goto out_release_lock_seqid;
4842                 }
4843                 data->arg.open_stateid = &state->open_stateid;
4844                 data->arg.new_lock_owner = 1;
4845                 data->res.open_seqid = data->arg.open_seqid;
4846         } else
4847                 data->arg.new_lock_owner = 0;
4848         if (!nfs4_valid_open_stateid(state)) {
4849                 data->rpc_status = -EBADF;
4850                 task->tk_action = NULL;
4851                 goto out_release_open_seqid;
4852         }
4853         data->timestamp = jiffies;
4854         if (nfs4_setup_sequence(data->server,
4855                                 &data->arg.seq_args,
4856                                 &data->res.seq_res,
4857                                 task) == 0)
4858                 return;
4859 out_release_open_seqid:
4860         nfs_release_seqid(data->arg.open_seqid);
4861 out_release_lock_seqid:
4862         nfs_release_seqid(data->arg.lock_seqid);
4863 out_wait:
4864         nfs4_sequence_done(task, &data->res.seq_res);
4865         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4866 }
4867
4868 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4869 {
4870         struct nfs4_lockdata *data = calldata;
4871
4872         dprintk("%s: begin!\n", __func__);
4873
4874         if (!nfs4_sequence_done(task, &data->res.seq_res))
4875                 return;
4876
4877         data->rpc_status = task->tk_status;
4878         if (data->arg.new_lock_owner != 0) {
4879                 if (data->rpc_status == 0)
4880                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4881                 else
4882                         goto out;
4883         }
4884         if (data->rpc_status == 0) {
4885                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4886                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4887                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4888         }
4889 out:
4890         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4891 }
4892
4893 static void nfs4_lock_release(void *calldata)
4894 {
4895         struct nfs4_lockdata *data = calldata;
4896
4897         dprintk("%s: begin!\n", __func__);
4898         nfs_free_seqid(data->arg.open_seqid);
4899         if (data->cancelled != 0) {
4900                 struct rpc_task *task;
4901                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4902                                 data->arg.lock_seqid);
4903                 if (!IS_ERR(task))
4904                         rpc_put_task_async(task);
4905                 dprintk("%s: cancelling lock!\n", __func__);
4906         } else
4907                 nfs_free_seqid(data->arg.lock_seqid);
4908         nfs4_put_lock_state(data->lsp);
4909         put_nfs_open_context(data->ctx);
4910         kfree(data);
4911         dprintk("%s: done!\n", __func__);
4912 }
4913
4914 static const struct rpc_call_ops nfs4_lock_ops = {
4915         .rpc_call_prepare = nfs4_lock_prepare,
4916         .rpc_call_done = nfs4_lock_done,
4917         .rpc_release = nfs4_lock_release,
4918 };
4919
4920 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4921 {
4922         switch (error) {
4923         case -NFS4ERR_ADMIN_REVOKED:
4924         case -NFS4ERR_BAD_STATEID:
4925                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4926                 if (new_lock_owner != 0 ||
4927                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4928                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4929                 break;
4930         case -NFS4ERR_STALE_STATEID:
4931                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4932         case -NFS4ERR_EXPIRED:
4933                 nfs4_schedule_lease_recovery(server->nfs_client);
4934         };
4935 }
4936
4937 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4938 {
4939         struct nfs4_lockdata *data;
4940         struct rpc_task *task;
4941         struct rpc_message msg = {
4942                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4943                 .rpc_cred = state->owner->so_cred,
4944         };
4945         struct rpc_task_setup task_setup_data = {
4946                 .rpc_client = NFS_CLIENT(state->inode),
4947                 .rpc_message = &msg,
4948                 .callback_ops = &nfs4_lock_ops,
4949                 .workqueue = nfsiod_workqueue,
4950                 .flags = RPC_TASK_ASYNC,
4951         };
4952         int ret;
4953
4954         dprintk("%s: begin!\n", __func__);
4955         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4956                         fl->fl_u.nfs4_fl.owner,
4957                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4958         if (data == NULL)
4959                 return -ENOMEM;
4960         if (IS_SETLKW(cmd))
4961                 data->arg.block = 1;
4962         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4963         msg.rpc_argp = &data->arg;
4964         msg.rpc_resp = &data->res;
4965         task_setup_data.callback_data = data;
4966         if (recovery_type > NFS_LOCK_NEW) {
4967                 if (recovery_type == NFS_LOCK_RECLAIM)
4968                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4969                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4970         }
4971         task = rpc_run_task(&task_setup_data);
4972         if (IS_ERR(task))
4973                 return PTR_ERR(task);
4974         ret = nfs4_wait_for_completion_rpc_task(task);
4975         if (ret == 0) {
4976                 ret = data->rpc_status;
4977                 if (ret)
4978                         nfs4_handle_setlk_error(data->server, data->lsp,
4979                                         data->arg.new_lock_owner, ret);
4980         } else
4981                 data->cancelled = 1;
4982         rpc_put_task(task);
4983         dprintk("%s: done, ret = %d!\n", __func__, ret);
4984         return ret;
4985 }
4986
4987 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4988 {
4989         struct nfs_server *server = NFS_SERVER(state->inode);
4990         struct nfs4_exception exception = {
4991                 .inode = state->inode,
4992         };
4993         int err;
4994
4995         do {
4996                 /* Cache the lock if possible... */
4997                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4998                         return 0;
4999                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5000                 if (err != -NFS4ERR_DELAY)
5001                         break;
5002                 nfs4_handle_exception(server, err, &exception);
5003         } while (exception.retry);
5004         return err;
5005 }
5006
5007 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5008 {
5009         struct nfs_server *server = NFS_SERVER(state->inode);
5010         struct nfs4_exception exception = {
5011                 .inode = state->inode,
5012         };
5013         int err;
5014
5015         err = nfs4_set_lock_state(state, request);
5016         if (err != 0)
5017                 return err;
5018         do {
5019                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5020                         return 0;
5021                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5022                 switch (err) {
5023                 default:
5024                         goto out;
5025                 case -NFS4ERR_GRACE:
5026                 case -NFS4ERR_DELAY:
5027                         nfs4_handle_exception(server, err, &exception);
5028                         err = 0;
5029                 }
5030         } while (exception.retry);
5031 out:
5032         return err;
5033 }
5034
5035 #if defined(CONFIG_NFS_V4_1)
5036 /**
5037  * nfs41_check_expired_locks - possibly free a lock stateid
5038  *
5039  * @state: NFSv4 state for an inode
5040  *
5041  * Returns NFS_OK if recovery for this stateid is now finished.
5042  * Otherwise a negative NFS4ERR value is returned.
5043  */
5044 static int nfs41_check_expired_locks(struct nfs4_state *state)
5045 {
5046         int status, ret = -NFS4ERR_BAD_STATEID;
5047         struct nfs4_lock_state *lsp;
5048         struct nfs_server *server = NFS_SERVER(state->inode);
5049
5050         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5051                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5052                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
5053                         if (status != NFS_OK) {
5054                                 /* Free the stateid unless the server
5055                                  * informs us the stateid is unrecognized. */
5056                                 if (status != -NFS4ERR_BAD_STATEID)
5057                                         nfs41_free_stateid(server,
5058                                                         &lsp->ls_stateid);
5059                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5060                                 ret = status;
5061                         }
5062                 }
5063         };
5064
5065         return ret;
5066 }
5067
5068 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5069 {
5070         int status = NFS_OK;
5071
5072         if (test_bit(LK_STATE_IN_USE, &state->flags))
5073                 status = nfs41_check_expired_locks(state);
5074         if (status != NFS_OK)
5075                 status = nfs4_lock_expired(state, request);
5076         return status;
5077 }
5078 #endif
5079
5080 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5081 {
5082         struct nfs4_state_owner *sp = state->owner;
5083         struct nfs_inode *nfsi = NFS_I(state->inode);
5084         unsigned char fl_flags = request->fl_flags;
5085         unsigned int seq;
5086         int status = -ENOLCK;
5087
5088         if ((fl_flags & FL_POSIX) &&
5089                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5090                 goto out;
5091         /* Is this a delegated open? */
5092         status = nfs4_set_lock_state(state, request);
5093         if (status != 0)
5094                 goto out;
5095         request->fl_flags |= FL_ACCESS;
5096         status = do_vfs_lock(request->fl_file, request);
5097         if (status < 0)
5098                 goto out;
5099         down_read(&nfsi->rwsem);
5100         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5101                 /* Yes: cache locks! */
5102                 /* ...but avoid races with delegation recall... */
5103                 request->fl_flags = fl_flags & ~FL_SLEEP;
5104                 status = do_vfs_lock(request->fl_file, request);
5105                 goto out_unlock;
5106         }
5107         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5108         up_read(&nfsi->rwsem);
5109         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5110         if (status != 0)
5111                 goto out;
5112         down_read(&nfsi->rwsem);
5113         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5114                 status = -NFS4ERR_DELAY;
5115                 goto out_unlock;
5116         }
5117         /* Note: we always want to sleep here! */
5118         request->fl_flags = fl_flags | FL_SLEEP;
5119         if (do_vfs_lock(request->fl_file, request) < 0)
5120                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5121                         "manager!\n", __func__);
5122 out_unlock:
5123         up_read(&nfsi->rwsem);
5124 out:
5125         request->fl_flags = fl_flags;
5126         return status;
5127 }
5128
5129 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5130 {
5131         struct nfs4_exception exception = {
5132                 .state = state,
5133                 .inode = state->inode,
5134         };
5135         int err;
5136
5137         do {
5138                 err = _nfs4_proc_setlk(state, cmd, request);
5139                 if (err == -NFS4ERR_DENIED)
5140                         err = -EAGAIN;
5141                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5142                                 err, &exception);
5143         } while (exception.retry);
5144         return err;
5145 }
5146
5147 static int
5148 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5149 {
5150         struct nfs_open_context *ctx;
5151         struct nfs4_state *state;
5152         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5153         int status;
5154
5155         /* verify open state */
5156         ctx = nfs_file_open_context(filp);
5157         state = ctx->state;
5158
5159         if (request->fl_start < 0 || request->fl_end < 0)
5160                 return -EINVAL;
5161
5162         if (IS_GETLK(cmd)) {
5163                 if (state != NULL)
5164                         return nfs4_proc_getlk(state, F_GETLK, request);
5165                 return 0;
5166         }
5167
5168         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5169                 return -EINVAL;
5170
5171         if (request->fl_type == F_UNLCK) {
5172                 if (state != NULL)
5173                         return nfs4_proc_unlck(state, cmd, request);
5174                 return 0;
5175         }
5176
5177         if (state == NULL)
5178                 return -ENOLCK;
5179         /*
5180          * Don't rely on the VFS having checked the file open mode,
5181          * since it won't do this for flock() locks.
5182          */
5183         switch (request->fl_type) {
5184         case F_RDLCK:
5185                 if (!(filp->f_mode & FMODE_READ))
5186                         return -EBADF;
5187                 break;
5188         case F_WRLCK:
5189                 if (!(filp->f_mode & FMODE_WRITE))
5190                         return -EBADF;
5191         }
5192
5193         do {
5194                 status = nfs4_proc_setlk(state, cmd, request);
5195                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5196                         break;
5197                 timeout = nfs4_set_lock_task_retry(timeout);
5198                 status = -ERESTARTSYS;
5199                 if (signalled())
5200                         break;
5201         } while(status < 0);
5202         return status;
5203 }
5204
5205 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5206 {
5207         struct nfs_server *server = NFS_SERVER(state->inode);
5208         int err;
5209
5210         err = nfs4_set_lock_state(state, fl);
5211         if (err != 0)
5212                 return err;
5213         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5214         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5215 }
5216
5217 struct nfs_release_lockowner_data {
5218         struct nfs4_lock_state *lsp;
5219         struct nfs_server *server;
5220         struct nfs_release_lockowner_args args;
5221 };
5222
5223 static void nfs4_release_lockowner_release(void *calldata)
5224 {
5225         struct nfs_release_lockowner_data *data = calldata;
5226         nfs4_free_lock_state(data->server, data->lsp);
5227         kfree(calldata);
5228 }
5229
5230 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5231         .rpc_release = nfs4_release_lockowner_release,
5232 };
5233
5234 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5235 {
5236         struct nfs_server *server = lsp->ls_state->owner->so_server;
5237         struct nfs_release_lockowner_data *data;
5238         struct rpc_message msg = {
5239                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5240         };
5241
5242         if (server->nfs_client->cl_mvops->minor_version != 0)
5243                 return -EINVAL;
5244         data = kmalloc(sizeof(*data), GFP_NOFS);
5245         if (!data)
5246                 return -ENOMEM;
5247         data->lsp = lsp;
5248         data->server = server;
5249         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5250         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5251         data->args.lock_owner.s_dev = server->s_dev;
5252         msg.rpc_argp = &data->args;
5253         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5254         return 0;
5255 }
5256
5257 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5258
5259 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5260                                    const void *buf, size_t buflen,
5261                                    int flags, int type)
5262 {
5263         if (strcmp(key, "") != 0)
5264                 return -EINVAL;
5265
5266         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5267 }
5268
5269 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5270                                    void *buf, size_t buflen, int type)
5271 {
5272         if (strcmp(key, "") != 0)
5273                 return -EINVAL;
5274
5275         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5276 }
5277
5278 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5279                                        size_t list_len, const char *name,
5280                                        size_t name_len, int type)
5281 {
5282         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5283
5284         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5285                 return 0;
5286
5287         if (list && len <= list_len)
5288                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5289         return len;
5290 }
5291
5292 /*
5293  * nfs_fhget will use either the mounted_on_fileid or the fileid
5294  */
5295 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5296 {
5297         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5298                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5299               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5300               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5301                 return;
5302
5303         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5304                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5305         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5306         fattr->nlink = 2;
5307 }
5308
5309 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5310                                    const struct qstr *name,
5311                                    struct nfs4_fs_locations *fs_locations,
5312                                    struct page *page)
5313 {
5314         struct nfs_server *server = NFS_SERVER(dir);
5315         u32 bitmask[2] = {
5316                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5317         };
5318         struct nfs4_fs_locations_arg args = {
5319                 .dir_fh = NFS_FH(dir),
5320                 .name = name,
5321                 .page = page,
5322                 .bitmask = bitmask,
5323         };
5324         struct nfs4_fs_locations_res res = {
5325                 .fs_locations = fs_locations,
5326         };
5327         struct rpc_message msg = {
5328                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5329                 .rpc_argp = &args,
5330                 .rpc_resp = &res,
5331         };
5332         int status;
5333
5334         dprintk("%s: start\n", __func__);
5335
5336         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5337          * is not supported */
5338         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5339                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5340         else
5341                 bitmask[0] |= FATTR4_WORD0_FILEID;
5342
5343         nfs_fattr_init(&fs_locations->fattr);
5344         fs_locations->server = server;
5345         fs_locations->nlocations = 0;
5346         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5347         dprintk("%s: returned status = %d\n", __func__, status);
5348         return status;
5349 }
5350
5351 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5352                            const struct qstr *name,
5353                            struct nfs4_fs_locations *fs_locations,
5354                            struct page *page)
5355 {
5356         struct nfs4_exception exception = { };
5357         int err;
5358         do {
5359                 err = nfs4_handle_exception(NFS_SERVER(dir),
5360                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5361                                 &exception);
5362         } while (exception.retry);
5363         return err;
5364 }
5365
5366 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5367 {
5368         int status;
5369         struct nfs4_secinfo_arg args = {
5370                 .dir_fh = NFS_FH(dir),
5371                 .name   = name,
5372         };
5373         struct nfs4_secinfo_res res = {
5374                 .flavors     = flavors,
5375         };
5376         struct rpc_message msg = {
5377                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5378                 .rpc_argp = &args,
5379                 .rpc_resp = &res,
5380         };
5381
5382         dprintk("NFS call  secinfo %s\n", name->name);
5383         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5384         dprintk("NFS reply  secinfo: %d\n", status);
5385         return status;
5386 }
5387
5388 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5389                       struct nfs4_secinfo_flavors *flavors)
5390 {
5391         struct nfs4_exception exception = { };
5392         int err;
5393         do {
5394                 err = nfs4_handle_exception(NFS_SERVER(dir),
5395                                 _nfs4_proc_secinfo(dir, name, flavors),
5396                                 &exception);
5397         } while (exception.retry);
5398         return err;
5399 }
5400
5401 #ifdef CONFIG_NFS_V4_1
5402 /*
5403  * Check the exchange flags returned by the server for invalid flags, having
5404  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5405  * DS flags set.
5406  */
5407 static int nfs4_check_cl_exchange_flags(u32 flags)
5408 {
5409         if (flags & ~EXCHGID4_FLAG_MASK_R)
5410                 goto out_inval;
5411         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5412             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5413                 goto out_inval;
5414         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5415                 goto out_inval;
5416         return NFS_OK;
5417 out_inval:
5418         return -NFS4ERR_INVAL;
5419 }
5420
5421 static bool
5422 nfs41_same_server_scope(struct nfs41_server_scope *a,
5423                         struct nfs41_server_scope *b)
5424 {
5425         if (a->server_scope_sz == b->server_scope_sz &&
5426             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5427                 return true;
5428
5429         return false;
5430 }
5431
5432 /*
5433  * nfs4_proc_bind_conn_to_session()
5434  *
5435  * The 4.1 client currently uses the same TCP connection for the
5436  * fore and backchannel.
5437  */
5438 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5439 {
5440         int status;
5441         struct nfs41_bind_conn_to_session_res res;
5442         struct rpc_message msg = {
5443                 .rpc_proc =
5444                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5445                 .rpc_argp = clp,
5446                 .rpc_resp = &res,
5447                 .rpc_cred = cred,
5448         };
5449
5450         dprintk("--> %s\n", __func__);
5451
5452         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5453         if (unlikely(res.session == NULL)) {
5454                 status = -ENOMEM;
5455                 goto out;
5456         }
5457
5458         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5459         if (status == 0) {
5460                 if (memcmp(res.session->sess_id.data,
5461                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5462                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5463                         status = -EIO;
5464                         goto out_session;
5465                 }
5466                 if (res.dir != NFS4_CDFS4_BOTH) {
5467                         dprintk("NFS: %s: Unexpected direction from server\n",
5468                                 __func__);
5469                         status = -EIO;
5470                         goto out_session;
5471                 }
5472                 if (res.use_conn_in_rdma_mode) {
5473                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5474                                 __func__);
5475                         status = -EIO;
5476                         goto out_session;
5477                 }
5478         }
5479 out_session:
5480         kfree(res.session);
5481 out:
5482         dprintk("<-- %s status= %d\n", __func__, status);
5483         return status;
5484 }
5485
5486 /*
5487  * nfs4_proc_exchange_id()
5488  *
5489  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5490  *
5491  * Since the clientid has expired, all compounds using sessions
5492  * associated with the stale clientid will be returning
5493  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5494  * be in some phase of session reset.
5495  */
5496 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5497 {
5498         nfs4_verifier verifier;
5499         struct nfs41_exchange_id_args args = {
5500                 .verifier = &verifier,
5501                 .client = clp,
5502                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5503         };
5504         struct nfs41_exchange_id_res res = {
5505                 0
5506         };
5507         int status;
5508         struct rpc_message msg = {
5509                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5510                 .rpc_argp = &args,
5511                 .rpc_resp = &res,
5512                 .rpc_cred = cred,
5513         };
5514
5515         nfs4_init_boot_verifier(clp, &verifier);
5516         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5517                                                         sizeof(args.id));
5518         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5519                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5520                 args.id_len, args.id);
5521
5522         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5523                                         GFP_NOFS);
5524         if (unlikely(res.server_owner == NULL)) {
5525                 status = -ENOMEM;
5526                 goto out;
5527         }
5528
5529         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5530                                         GFP_NOFS);
5531         if (unlikely(res.server_scope == NULL)) {
5532                 status = -ENOMEM;
5533                 goto out_server_owner;
5534         }
5535
5536         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5537         if (unlikely(res.impl_id == NULL)) {
5538                 status = -ENOMEM;
5539                 goto out_server_scope;
5540         }
5541
5542         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5543         if (status == 0)
5544                 status = nfs4_check_cl_exchange_flags(res.flags);
5545
5546         if (status == 0) {
5547                 clp->cl_clientid = res.clientid;
5548                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5549                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5550                         clp->cl_seqid = res.seqid;
5551
5552                 kfree(clp->cl_serverowner);
5553                 clp->cl_serverowner = res.server_owner;
5554                 res.server_owner = NULL;
5555
5556                 /* use the most recent implementation id */
5557                 kfree(clp->cl_implid);
5558                 clp->cl_implid = res.impl_id;
5559
5560                 if (clp->cl_serverscope != NULL &&
5561                     !nfs41_same_server_scope(clp->cl_serverscope,
5562                                              res.server_scope)) {
5563                         dprintk("%s: server_scope mismatch detected\n",
5564                                 __func__);
5565                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5566                         kfree(clp->cl_serverscope);
5567                         clp->cl_serverscope = NULL;
5568                 }
5569
5570                 if (clp->cl_serverscope == NULL) {
5571                         clp->cl_serverscope = res.server_scope;
5572                         goto out;
5573                 }
5574         } else
5575                 kfree(res.impl_id);
5576
5577 out_server_owner:
5578         kfree(res.server_owner);
5579 out_server_scope:
5580         kfree(res.server_scope);
5581 out:
5582         if (clp->cl_implid != NULL)
5583                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5584                         "domain: %s, name: %s, date: %llu,%u\n",
5585                         clp->cl_implid->domain, clp->cl_implid->name,
5586                         clp->cl_implid->date.seconds,
5587                         clp->cl_implid->date.nseconds);
5588         dprintk("NFS reply exchange_id: %d\n", status);
5589         return status;
5590 }
5591
5592 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5593                 struct rpc_cred *cred)
5594 {
5595         struct rpc_message msg = {
5596                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5597                 .rpc_argp = clp,
5598                 .rpc_cred = cred,
5599         };
5600         int status;
5601
5602         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5603         if (status)
5604                 dprintk("NFS: Got error %d from the server %s on "
5605                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5606         return status;
5607 }
5608
5609 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5610                 struct rpc_cred *cred)
5611 {
5612         unsigned int loop;
5613         int ret;
5614
5615         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5616                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5617                 switch (ret) {
5618                 case -NFS4ERR_DELAY:
5619                 case -NFS4ERR_CLIENTID_BUSY:
5620                         ssleep(1);
5621                         break;
5622                 default:
5623                         return ret;
5624                 }
5625         }
5626         return 0;
5627 }
5628
5629 int nfs4_destroy_clientid(struct nfs_client *clp)
5630 {
5631         struct rpc_cred *cred;
5632         int ret = 0;
5633
5634         if (clp->cl_mvops->minor_version < 1)
5635                 goto out;
5636         if (clp->cl_exchange_flags == 0)
5637                 goto out;
5638         if (clp->cl_preserve_clid)
5639                 goto out;
5640         cred = nfs4_get_exchange_id_cred(clp);
5641         ret = nfs4_proc_destroy_clientid(clp, cred);
5642         if (cred)
5643                 put_rpccred(cred);
5644         switch (ret) {
5645         case 0:
5646         case -NFS4ERR_STALE_CLIENTID:
5647                 clp->cl_exchange_flags = 0;
5648         }
5649 out:
5650         return ret;
5651 }
5652
5653 struct nfs4_get_lease_time_data {
5654         struct nfs4_get_lease_time_args *args;
5655         struct nfs4_get_lease_time_res *res;
5656         struct nfs_client *clp;
5657 };
5658
5659 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5660                                         void *calldata)
5661 {
5662         struct nfs4_get_lease_time_data *data =
5663                         (struct nfs4_get_lease_time_data *)calldata;
5664
5665         dprintk("--> %s\n", __func__);
5666         /* just setup sequence, do not trigger session recovery
5667            since we're invoked within one */
5668         nfs41_setup_sequence(data->clp->cl_session,
5669                         &data->args->la_seq_args,
5670                         &data->res->lr_seq_res,
5671                         task);
5672         dprintk("<-- %s\n", __func__);
5673 }
5674
5675 /*
5676  * Called from nfs4_state_manager thread for session setup, so don't recover
5677  * from sequence operation or clientid errors.
5678  */
5679 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5680 {
5681         struct nfs4_get_lease_time_data *data =
5682                         (struct nfs4_get_lease_time_data *)calldata;
5683
5684         dprintk("--> %s\n", __func__);
5685         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5686                 return;
5687         switch (task->tk_status) {
5688         case -NFS4ERR_DELAY:
5689         case -NFS4ERR_GRACE:
5690                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5691                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5692                 task->tk_status = 0;
5693                 /* fall through */
5694         case -NFS4ERR_RETRY_UNCACHED_REP:
5695                 rpc_restart_call_prepare(task);
5696                 return;
5697         }
5698         dprintk("<-- %s\n", __func__);
5699 }
5700
5701 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5702         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5703         .rpc_call_done = nfs4_get_lease_time_done,
5704 };
5705
5706 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5707 {
5708         struct rpc_task *task;
5709         struct nfs4_get_lease_time_args args;
5710         struct nfs4_get_lease_time_res res = {
5711                 .lr_fsinfo = fsinfo,
5712         };
5713         struct nfs4_get_lease_time_data data = {
5714                 .args = &args,
5715                 .res = &res,
5716                 .clp = clp,
5717         };
5718         struct rpc_message msg = {
5719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5720                 .rpc_argp = &args,
5721                 .rpc_resp = &res,
5722         };
5723         struct rpc_task_setup task_setup = {
5724                 .rpc_client = clp->cl_rpcclient,
5725                 .rpc_message = &msg,
5726                 .callback_ops = &nfs4_get_lease_time_ops,
5727                 .callback_data = &data,
5728                 .flags = RPC_TASK_TIMEOUT,
5729         };
5730         int status;
5731
5732         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5733         nfs4_set_sequence_privileged(&args.la_seq_args);
5734         dprintk("--> %s\n", __func__);
5735         task = rpc_run_task(&task_setup);
5736
5737         if (IS_ERR(task))
5738                 status = PTR_ERR(task);
5739         else {
5740                 status = task->tk_status;
5741                 rpc_put_task(task);
5742         }
5743         dprintk("<-- %s return %d\n", __func__, status);
5744
5745         return status;
5746 }
5747
5748 /*
5749  * Initialize the values to be used by the client in CREATE_SESSION
5750  * If nfs4_init_session set the fore channel request and response sizes,
5751  * use them.
5752  *
5753  * Set the back channel max_resp_sz_cached to zero to force the client to
5754  * always set csa_cachethis to FALSE because the current implementation
5755  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5756  */
5757 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5758 {
5759         struct nfs4_session *session = args->client->cl_session;
5760         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5761                      mxresp_sz = session->fc_target_max_resp_sz;
5762
5763         if (mxrqst_sz == 0)
5764                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5765         if (mxresp_sz == 0)
5766                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5767         /* Fore channel attributes */
5768         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5769         args->fc_attrs.max_resp_sz = mxresp_sz;
5770         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5771         args->fc_attrs.max_reqs = max_session_slots;
5772
5773         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5774                 "max_ops=%u max_reqs=%u\n",
5775                 __func__,
5776                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5777                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5778
5779         /* Back channel attributes */
5780         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5781         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5782         args->bc_attrs.max_resp_sz_cached = 0;
5783         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5784         args->bc_attrs.max_reqs = 1;
5785
5786         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5787                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5788                 __func__,
5789                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5790                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5791                 args->bc_attrs.max_reqs);
5792 }
5793
5794 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5795 {
5796         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5797         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5798
5799         if (rcvd->max_resp_sz > sent->max_resp_sz)
5800                 return -EINVAL;
5801         /*
5802          * Our requested max_ops is the minimum we need; we're not
5803          * prepared to break up compounds into smaller pieces than that.
5804          * So, no point even trying to continue if the server won't
5805          * cooperate:
5806          */
5807         if (rcvd->max_ops < sent->max_ops)
5808                 return -EINVAL;
5809         if (rcvd->max_reqs == 0)
5810                 return -EINVAL;
5811         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5812                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5813         return 0;
5814 }
5815
5816 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5817 {
5818         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5819         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5820
5821         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5822                 return -EINVAL;
5823         if (rcvd->max_resp_sz < sent->max_resp_sz)
5824                 return -EINVAL;
5825         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5826                 return -EINVAL;
5827         /* These would render the backchannel useless: */
5828         if (rcvd->max_ops != sent->max_ops)
5829                 return -EINVAL;
5830         if (rcvd->max_reqs != sent->max_reqs)
5831                 return -EINVAL;
5832         return 0;
5833 }
5834
5835 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5836                                      struct nfs4_session *session)
5837 {
5838         int ret;
5839
5840         ret = nfs4_verify_fore_channel_attrs(args, session);
5841         if (ret)
5842                 return ret;
5843         return nfs4_verify_back_channel_attrs(args, session);
5844 }
5845
5846 static int _nfs4_proc_create_session(struct nfs_client *clp,
5847                 struct rpc_cred *cred)
5848 {
5849         struct nfs4_session *session = clp->cl_session;
5850         struct nfs41_create_session_args args = {
5851                 .client = clp,
5852                 .cb_program = NFS4_CALLBACK,
5853         };
5854         struct nfs41_create_session_res res = {
5855                 .client = clp,
5856         };
5857         struct rpc_message msg = {
5858                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5859                 .rpc_argp = &args,
5860                 .rpc_resp = &res,
5861                 .rpc_cred = cred,
5862         };
5863         int status;
5864
5865         nfs4_init_channel_attrs(&args);
5866         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5867
5868         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5869
5870         if (!status) {
5871                 /* Verify the session's negotiated channel_attrs values */
5872                 status = nfs4_verify_channel_attrs(&args, session);
5873                 /* Increment the clientid slot sequence id */
5874                 clp->cl_seqid++;
5875         }
5876
5877         return status;
5878 }
5879
5880 /*
5881  * Issues a CREATE_SESSION operation to the server.
5882  * It is the responsibility of the caller to verify the session is
5883  * expired before calling this routine.
5884  */
5885 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5886 {
5887         int status;
5888         unsigned *ptr;
5889         struct nfs4_session *session = clp->cl_session;
5890
5891         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5892
5893         status = _nfs4_proc_create_session(clp, cred);
5894         if (status)
5895                 goto out;
5896
5897         /* Init or reset the session slot tables */
5898         status = nfs4_setup_session_slot_tables(session);
5899         dprintk("slot table setup returned %d\n", status);
5900         if (status)
5901                 goto out;
5902
5903         ptr = (unsigned *)&session->sess_id.data[0];
5904         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5905                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5906 out:
5907         dprintk("<-- %s\n", __func__);
5908         return status;
5909 }
5910
5911 /*
5912  * Issue the over-the-wire RPC DESTROY_SESSION.
5913  * The caller must serialize access to this routine.
5914  */
5915 int nfs4_proc_destroy_session(struct nfs4_session *session,
5916                 struct rpc_cred *cred)
5917 {
5918         struct rpc_message msg = {
5919                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5920                 .rpc_argp = session,
5921                 .rpc_cred = cred,
5922         };
5923         int status = 0;
5924
5925         dprintk("--> nfs4_proc_destroy_session\n");
5926
5927         /* session is still being setup */
5928         if (session->clp->cl_cons_state != NFS_CS_READY)
5929                 return status;
5930
5931         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5932
5933         if (status)
5934                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5935                         "Session has been destroyed regardless...\n", status);
5936
5937         dprintk("<-- nfs4_proc_destroy_session\n");
5938         return status;
5939 }
5940
5941 /*
5942  * Renew the cl_session lease.
5943  */
5944 struct nfs4_sequence_data {
5945         struct nfs_client *clp;
5946         struct nfs4_sequence_args args;
5947         struct nfs4_sequence_res res;
5948 };
5949
5950 static void nfs41_sequence_release(void *data)
5951 {
5952         struct nfs4_sequence_data *calldata = data;
5953         struct nfs_client *clp = calldata->clp;
5954
5955         if (atomic_read(&clp->cl_count) > 1)
5956                 nfs4_schedule_state_renewal(clp);
5957         nfs_put_client(clp);
5958         kfree(calldata);
5959 }
5960
5961 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5962 {
5963         switch(task->tk_status) {
5964         case -NFS4ERR_DELAY:
5965                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5966                 return -EAGAIN;
5967         default:
5968                 nfs4_schedule_lease_recovery(clp);
5969         }
5970         return 0;
5971 }
5972
5973 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5974 {
5975         struct nfs4_sequence_data *calldata = data;
5976         struct nfs_client *clp = calldata->clp;
5977
5978         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5979                 return;
5980
5981         if (task->tk_status < 0) {
5982                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5983                 if (atomic_read(&clp->cl_count) == 1)
5984                         goto out;
5985
5986                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5987                         rpc_restart_call_prepare(task);
5988                         return;
5989                 }
5990         }
5991         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5992 out:
5993         dprintk("<-- %s\n", __func__);
5994 }
5995
5996 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5997 {
5998         struct nfs4_sequence_data *calldata = data;
5999         struct nfs_client *clp = calldata->clp;
6000         struct nfs4_sequence_args *args;
6001         struct nfs4_sequence_res *res;
6002
6003         args = task->tk_msg.rpc_argp;
6004         res = task->tk_msg.rpc_resp;
6005
6006         nfs41_setup_sequence(clp->cl_session, args, res, task);
6007 }
6008
6009 static const struct rpc_call_ops nfs41_sequence_ops = {
6010         .rpc_call_done = nfs41_sequence_call_done,
6011         .rpc_call_prepare = nfs41_sequence_prepare,
6012         .rpc_release = nfs41_sequence_release,
6013 };
6014
6015 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6016                 struct rpc_cred *cred,
6017                 bool is_privileged)
6018 {
6019         struct nfs4_sequence_data *calldata;
6020         struct rpc_message msg = {
6021                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6022                 .rpc_cred = cred,
6023         };
6024         struct rpc_task_setup task_setup_data = {
6025                 .rpc_client = clp->cl_rpcclient,
6026                 .rpc_message = &msg,
6027                 .callback_ops = &nfs41_sequence_ops,
6028                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6029         };
6030
6031         if (!atomic_inc_not_zero(&clp->cl_count))
6032                 return ERR_PTR(-EIO);
6033         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6034         if (calldata == NULL) {
6035                 nfs_put_client(clp);
6036                 return ERR_PTR(-ENOMEM);
6037         }
6038         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6039         if (is_privileged)
6040                 nfs4_set_sequence_privileged(&calldata->args);
6041         msg.rpc_argp = &calldata->args;
6042         msg.rpc_resp = &calldata->res;
6043         calldata->clp = clp;
6044         task_setup_data.callback_data = calldata;
6045
6046         return rpc_run_task(&task_setup_data);
6047 }
6048
6049 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6050 {
6051         struct rpc_task *task;
6052         int ret = 0;
6053
6054         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6055                 return 0;
6056         task = _nfs41_proc_sequence(clp, cred, false);
6057         if (IS_ERR(task))
6058                 ret = PTR_ERR(task);
6059         else
6060                 rpc_put_task_async(task);
6061         dprintk("<-- %s status=%d\n", __func__, ret);
6062         return ret;
6063 }
6064
6065 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6066 {
6067         struct rpc_task *task;
6068         int ret;
6069
6070         task = _nfs41_proc_sequence(clp, cred, true);
6071         if (IS_ERR(task)) {
6072                 ret = PTR_ERR(task);
6073                 goto out;
6074         }
6075         ret = rpc_wait_for_completion_task(task);
6076         if (!ret) {
6077                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6078
6079                 if (task->tk_status == 0)
6080                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6081                 ret = task->tk_status;
6082         }
6083         rpc_put_task(task);
6084 out:
6085         dprintk("<-- %s status=%d\n", __func__, ret);
6086         return ret;
6087 }
6088
6089 struct nfs4_reclaim_complete_data {
6090         struct nfs_client *clp;
6091         struct nfs41_reclaim_complete_args arg;
6092         struct nfs41_reclaim_complete_res res;
6093 };
6094
6095 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6096 {
6097         struct nfs4_reclaim_complete_data *calldata = data;
6098
6099         nfs41_setup_sequence(calldata->clp->cl_session,
6100                         &calldata->arg.seq_args,
6101                         &calldata->res.seq_res,
6102                         task);
6103 }
6104
6105 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6106 {
6107         switch(task->tk_status) {
6108         case 0:
6109         case -NFS4ERR_COMPLETE_ALREADY:
6110         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6111                 break;
6112         case -NFS4ERR_DELAY:
6113                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6114                 /* fall through */
6115         case -NFS4ERR_RETRY_UNCACHED_REP:
6116                 return -EAGAIN;
6117         default:
6118                 nfs4_schedule_lease_recovery(clp);
6119         }
6120         return 0;
6121 }
6122
6123 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6124 {
6125         struct nfs4_reclaim_complete_data *calldata = data;
6126         struct nfs_client *clp = calldata->clp;
6127         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6128
6129         dprintk("--> %s\n", __func__);
6130         if (!nfs41_sequence_done(task, res))
6131                 return;
6132
6133         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6134                 rpc_restart_call_prepare(task);
6135                 return;
6136         }
6137         dprintk("<-- %s\n", __func__);
6138 }
6139
6140 static void nfs4_free_reclaim_complete_data(void *data)
6141 {
6142         struct nfs4_reclaim_complete_data *calldata = data;
6143
6144         kfree(calldata);
6145 }
6146
6147 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6148         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6149         .rpc_call_done = nfs4_reclaim_complete_done,
6150         .rpc_release = nfs4_free_reclaim_complete_data,
6151 };
6152
6153 /*
6154  * Issue a global reclaim complete.
6155  */
6156 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6157 {
6158         struct nfs4_reclaim_complete_data *calldata;
6159         struct rpc_task *task;
6160         struct rpc_message msg = {
6161                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6162         };
6163         struct rpc_task_setup task_setup_data = {
6164                 .rpc_client = clp->cl_rpcclient,
6165                 .rpc_message = &msg,
6166                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6167                 .flags = RPC_TASK_ASYNC,
6168         };
6169         int status = -ENOMEM;
6170
6171         dprintk("--> %s\n", __func__);
6172         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6173         if (calldata == NULL)
6174                 goto out;
6175         calldata->clp = clp;
6176         calldata->arg.one_fs = 0;
6177
6178         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6179         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6180         msg.rpc_argp = &calldata->arg;
6181         msg.rpc_resp = &calldata->res;
6182         task_setup_data.callback_data = calldata;
6183         task = rpc_run_task(&task_setup_data);
6184         if (IS_ERR(task)) {
6185                 status = PTR_ERR(task);
6186                 goto out;
6187         }
6188         status = nfs4_wait_for_completion_rpc_task(task);
6189         if (status == 0)
6190                 status = task->tk_status;
6191         rpc_put_task(task);
6192         return 0;
6193 out:
6194         dprintk("<-- %s status=%d\n", __func__, status);
6195         return status;
6196 }
6197
6198 static void
6199 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6200 {
6201         struct nfs4_layoutget *lgp = calldata;
6202         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6203         struct nfs4_session *session = nfs4_get_session(server);
6204
6205         dprintk("--> %s\n", __func__);
6206         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6207          * right now covering the LAYOUTGET we are about to send.
6208          * However, that is not so catastrophic, and there seems
6209          * to be no way to prevent it completely.
6210          */
6211         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6212                                 &lgp->res.seq_res, task))
6213                 return;
6214         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6215                                           NFS_I(lgp->args.inode)->layout,
6216                                           lgp->args.ctx->state)) {
6217                 rpc_exit(task, NFS4_OK);
6218         }
6219 }
6220
6221 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6222 {
6223         struct nfs4_layoutget *lgp = calldata;
6224         struct inode *inode = lgp->args.inode;
6225         struct nfs_server *server = NFS_SERVER(inode);
6226         struct pnfs_layout_hdr *lo;
6227         struct nfs4_state *state = NULL;
6228         unsigned long timeo, giveup;
6229
6230         dprintk("--> %s\n", __func__);
6231
6232         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6233                 goto out;
6234
6235         switch (task->tk_status) {
6236         case 0:
6237                 goto out;
6238         case -NFS4ERR_LAYOUTTRYLATER:
6239         case -NFS4ERR_RECALLCONFLICT:
6240                 timeo = rpc_get_timeout(task->tk_client);
6241                 giveup = lgp->args.timestamp + timeo;
6242                 if (time_after(giveup, jiffies))
6243                         task->tk_status = -NFS4ERR_DELAY;
6244                 break;
6245         case -NFS4ERR_EXPIRED:
6246         case -NFS4ERR_BAD_STATEID:
6247                 spin_lock(&inode->i_lock);
6248                 lo = NFS_I(inode)->layout;
6249                 if (!lo || list_empty(&lo->plh_segs)) {
6250                         spin_unlock(&inode->i_lock);
6251                         /* If the open stateid was bad, then recover it. */
6252                         state = lgp->args.ctx->state;
6253                 } else {
6254                         LIST_HEAD(head);
6255
6256                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6257                         spin_unlock(&inode->i_lock);
6258                         /* Mark the bad layout state as invalid, then
6259                          * retry using the open stateid. */
6260                         pnfs_free_lseg_list(&head);
6261                 }
6262         }
6263         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6264                 rpc_restart_call_prepare(task);
6265 out:
6266         dprintk("<-- %s\n", __func__);
6267 }
6268
6269 static size_t max_response_pages(struct nfs_server *server)
6270 {
6271         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6272         return nfs_page_array_len(0, max_resp_sz);
6273 }
6274
6275 static void nfs4_free_pages(struct page **pages, size_t size)
6276 {
6277         int i;
6278
6279         if (!pages)
6280                 return;
6281
6282         for (i = 0; i < size; i++) {
6283                 if (!pages[i])
6284                         break;
6285                 __free_page(pages[i]);
6286         }
6287         kfree(pages);
6288 }
6289
6290 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6291 {
6292         struct page **pages;
6293         int i;
6294
6295         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6296         if (!pages) {
6297                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6298                 return NULL;
6299         }
6300
6301         for (i = 0; i < size; i++) {
6302                 pages[i] = alloc_page(gfp_flags);
6303                 if (!pages[i]) {
6304                         dprintk("%s: failed to allocate page\n", __func__);
6305                         nfs4_free_pages(pages, size);
6306                         return NULL;
6307                 }
6308         }
6309
6310         return pages;
6311 }
6312
6313 static void nfs4_layoutget_release(void *calldata)
6314 {
6315         struct nfs4_layoutget *lgp = calldata;
6316         struct inode *inode = lgp->args.inode;
6317         struct nfs_server *server = NFS_SERVER(inode);
6318         size_t max_pages = max_response_pages(server);
6319
6320         dprintk("--> %s\n", __func__);
6321         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6322         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6323         put_nfs_open_context(lgp->args.ctx);
6324         kfree(calldata);
6325         dprintk("<-- %s\n", __func__);
6326 }
6327
6328 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6329         .rpc_call_prepare = nfs4_layoutget_prepare,
6330         .rpc_call_done = nfs4_layoutget_done,
6331         .rpc_release = nfs4_layoutget_release,
6332 };
6333
6334 struct pnfs_layout_segment *
6335 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6336 {
6337         struct inode *inode = lgp->args.inode;
6338         struct nfs_server *server = NFS_SERVER(inode);
6339         size_t max_pages = max_response_pages(server);
6340         struct rpc_task *task;
6341         struct rpc_message msg = {
6342                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6343                 .rpc_argp = &lgp->args,
6344                 .rpc_resp = &lgp->res,
6345         };
6346         struct rpc_task_setup task_setup_data = {
6347                 .rpc_client = server->client,
6348                 .rpc_message = &msg,
6349                 .callback_ops = &nfs4_layoutget_call_ops,
6350                 .callback_data = lgp,
6351                 .flags = RPC_TASK_ASYNC,
6352         };
6353         struct pnfs_layout_segment *lseg = NULL;
6354         int status = 0;
6355
6356         dprintk("--> %s\n", __func__);
6357
6358         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6359         if (!lgp->args.layout.pages) {
6360                 nfs4_layoutget_release(lgp);
6361                 return ERR_PTR(-ENOMEM);
6362         }
6363         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6364         lgp->args.timestamp = jiffies;
6365
6366         lgp->res.layoutp = &lgp->args.layout;
6367         lgp->res.seq_res.sr_slot = NULL;
6368         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6369
6370         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6371         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6372
6373         task = rpc_run_task(&task_setup_data);
6374         if (IS_ERR(task))
6375                 return ERR_CAST(task);
6376         status = nfs4_wait_for_completion_rpc_task(task);
6377         if (status == 0)
6378                 status = task->tk_status;
6379         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6380         if (status == 0 && lgp->res.layoutp->len)
6381                 lseg = pnfs_layout_process(lgp);
6382         rpc_put_task(task);
6383         dprintk("<-- %s status=%d\n", __func__, status);
6384         if (status)
6385                 return ERR_PTR(status);
6386         return lseg;
6387 }
6388
6389 static void
6390 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6391 {
6392         struct nfs4_layoutreturn *lrp = calldata;
6393
6394         dprintk("--> %s\n", __func__);
6395         nfs41_setup_sequence(lrp->clp->cl_session,
6396                         &lrp->args.seq_args,
6397                         &lrp->res.seq_res,
6398                         task);
6399 }
6400
6401 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6402 {
6403         struct nfs4_layoutreturn *lrp = calldata;
6404         struct nfs_server *server;
6405
6406         dprintk("--> %s\n", __func__);
6407
6408         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6409                 return;
6410
6411         server = NFS_SERVER(lrp->args.inode);
6412         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6413                 rpc_restart_call_prepare(task);
6414                 return;
6415         }
6416         dprintk("<-- %s\n", __func__);
6417 }
6418
6419 static void nfs4_layoutreturn_release(void *calldata)
6420 {
6421         struct nfs4_layoutreturn *lrp = calldata;
6422         struct pnfs_layout_hdr *lo = lrp->args.layout;
6423
6424         dprintk("--> %s\n", __func__);
6425         spin_lock(&lo->plh_inode->i_lock);
6426         if (lrp->res.lrs_present)
6427                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6428         lo->plh_block_lgets--;
6429         spin_unlock(&lo->plh_inode->i_lock);
6430         pnfs_put_layout_hdr(lrp->args.layout);
6431         kfree(calldata);
6432         dprintk("<-- %s\n", __func__);
6433 }
6434
6435 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6436         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6437         .rpc_call_done = nfs4_layoutreturn_done,
6438         .rpc_release = nfs4_layoutreturn_release,
6439 };
6440
6441 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6442 {
6443         struct rpc_task *task;
6444         struct rpc_message msg = {
6445                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6446                 .rpc_argp = &lrp->args,
6447                 .rpc_resp = &lrp->res,
6448         };
6449         struct rpc_task_setup task_setup_data = {
6450                 .rpc_client = lrp->clp->cl_rpcclient,
6451                 .rpc_message = &msg,
6452                 .callback_ops = &nfs4_layoutreturn_call_ops,
6453                 .callback_data = lrp,
6454         };
6455         int status;
6456
6457         dprintk("--> %s\n", __func__);
6458         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6459         task = rpc_run_task(&task_setup_data);
6460         if (IS_ERR(task))
6461                 return PTR_ERR(task);
6462         status = task->tk_status;
6463         dprintk("<-- %s status=%d\n", __func__, status);
6464         rpc_put_task(task);
6465         return status;
6466 }
6467
6468 /*
6469  * Retrieve the list of Data Server devices from the MDS.
6470  */
6471 static int _nfs4_getdevicelist(struct nfs_server *server,
6472                                     const struct nfs_fh *fh,
6473                                     struct pnfs_devicelist *devlist)
6474 {
6475         struct nfs4_getdevicelist_args args = {
6476                 .fh = fh,
6477                 .layoutclass = server->pnfs_curr_ld->id,
6478         };
6479         struct nfs4_getdevicelist_res res = {
6480                 .devlist = devlist,
6481         };
6482         struct rpc_message msg = {
6483                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6484                 .rpc_argp = &args,
6485                 .rpc_resp = &res,
6486         };
6487         int status;
6488
6489         dprintk("--> %s\n", __func__);
6490         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6491                                 &res.seq_res, 0);
6492         dprintk("<-- %s status=%d\n", __func__, status);
6493         return status;
6494 }
6495
6496 int nfs4_proc_getdevicelist(struct nfs_server *server,
6497                             const struct nfs_fh *fh,
6498                             struct pnfs_devicelist *devlist)
6499 {
6500         struct nfs4_exception exception = { };
6501         int err;
6502
6503         do {
6504                 err = nfs4_handle_exception(server,
6505                                 _nfs4_getdevicelist(server, fh, devlist),
6506                                 &exception);
6507         } while (exception.retry);
6508
6509         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6510                 err, devlist->num_devs);
6511
6512         return err;
6513 }
6514 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6515
6516 static int
6517 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6518 {
6519         struct nfs4_getdeviceinfo_args args = {
6520                 .pdev = pdev,
6521         };
6522         struct nfs4_getdeviceinfo_res res = {
6523                 .pdev = pdev,
6524         };
6525         struct rpc_message msg = {
6526                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6527                 .rpc_argp = &args,
6528                 .rpc_resp = &res,
6529         };
6530         int status;
6531
6532         dprintk("--> %s\n", __func__);
6533         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6534         dprintk("<-- %s status=%d\n", __func__, status);
6535
6536         return status;
6537 }
6538
6539 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6540 {
6541         struct nfs4_exception exception = { };
6542         int err;
6543
6544         do {
6545                 err = nfs4_handle_exception(server,
6546                                         _nfs4_proc_getdeviceinfo(server, pdev),
6547                                         &exception);
6548         } while (exception.retry);
6549         return err;
6550 }
6551 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6552
6553 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6554 {
6555         struct nfs4_layoutcommit_data *data = calldata;
6556         struct nfs_server *server = NFS_SERVER(data->args.inode);
6557         struct nfs4_session *session = nfs4_get_session(server);
6558
6559         nfs41_setup_sequence(session,
6560                         &data->args.seq_args,
6561                         &data->res.seq_res,
6562                         task);
6563 }
6564
6565 static void
6566 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6567 {
6568         struct nfs4_layoutcommit_data *data = calldata;
6569         struct nfs_server *server = NFS_SERVER(data->args.inode);
6570
6571         if (!nfs41_sequence_done(task, &data->res.seq_res))
6572                 return;
6573
6574         switch (task->tk_status) { /* Just ignore these failures */
6575         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6576         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6577         case -NFS4ERR_BADLAYOUT:     /* no layout */
6578         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6579                 task->tk_status = 0;
6580                 break;
6581         case 0:
6582                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6583                                                    data->res.fattr);
6584                 break;
6585         default:
6586                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6587                         rpc_restart_call_prepare(task);
6588                         return;
6589                 }
6590         }
6591 }
6592
6593 static void nfs4_layoutcommit_release(void *calldata)
6594 {
6595         struct nfs4_layoutcommit_data *data = calldata;
6596
6597         pnfs_cleanup_layoutcommit(data);
6598         put_rpccred(data->cred);
6599         kfree(data);
6600 }
6601
6602 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6603         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6604         .rpc_call_done = nfs4_layoutcommit_done,
6605         .rpc_release = nfs4_layoutcommit_release,
6606 };
6607
6608 int
6609 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6610 {
6611         struct rpc_message msg = {
6612                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6613                 .rpc_argp = &data->args,
6614                 .rpc_resp = &data->res,
6615                 .rpc_cred = data->cred,
6616         };
6617         struct rpc_task_setup task_setup_data = {
6618                 .task = &data->task,
6619                 .rpc_client = NFS_CLIENT(data->args.inode),
6620                 .rpc_message = &msg,
6621                 .callback_ops = &nfs4_layoutcommit_ops,
6622                 .callback_data = data,
6623                 .flags = RPC_TASK_ASYNC,
6624         };
6625         struct rpc_task *task;
6626         int status = 0;
6627
6628         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6629                 "lbw: %llu inode %lu\n",
6630                 data->task.tk_pid, sync,
6631                 data->args.lastbytewritten,
6632                 data->args.inode->i_ino);
6633
6634         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6635         task = rpc_run_task(&task_setup_data);
6636         if (IS_ERR(task))
6637                 return PTR_ERR(task);
6638         if (sync == false)
6639                 goto out;
6640         status = nfs4_wait_for_completion_rpc_task(task);
6641         if (status != 0)
6642                 goto out;
6643         status = task->tk_status;
6644 out:
6645         dprintk("%s: status %d\n", __func__, status);
6646         rpc_put_task(task);
6647         return status;
6648 }
6649
6650 static int
6651 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6652                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6653 {
6654         struct nfs41_secinfo_no_name_args args = {
6655                 .style = SECINFO_STYLE_CURRENT_FH,
6656         };
6657         struct nfs4_secinfo_res res = {
6658                 .flavors = flavors,
6659         };
6660         struct rpc_message msg = {
6661                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6662                 .rpc_argp = &args,
6663                 .rpc_resp = &res,
6664         };
6665         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6666 }
6667
6668 static int
6669 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6670                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6671 {
6672         struct nfs4_exception exception = { };
6673         int err;
6674         do {
6675                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6676                 switch (err) {
6677                 case 0:
6678                 case -NFS4ERR_WRONGSEC:
6679                 case -NFS4ERR_NOTSUPP:
6680                         goto out;
6681                 default:
6682                         err = nfs4_handle_exception(server, err, &exception);
6683                 }
6684         } while (exception.retry);
6685 out:
6686         return err;
6687 }
6688
6689 static int
6690 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6691                     struct nfs_fsinfo *info)
6692 {
6693         int err;
6694         struct page *page;
6695         rpc_authflavor_t flavor;
6696         struct nfs4_secinfo_flavors *flavors;
6697
6698         page = alloc_page(GFP_KERNEL);
6699         if (!page) {
6700                 err = -ENOMEM;
6701                 goto out;
6702         }
6703
6704         flavors = page_address(page);
6705         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6706
6707         /*
6708          * Fall back on "guess and check" method if
6709          * the server doesn't support SECINFO_NO_NAME
6710          */
6711         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6712                 err = nfs4_find_root_sec(server, fhandle, info);
6713                 goto out_freepage;
6714         }
6715         if (err)
6716                 goto out_freepage;
6717
6718         flavor = nfs_find_best_sec(flavors);
6719         if (err == 0)
6720                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6721
6722 out_freepage:
6723         put_page(page);
6724         if (err == -EACCES)
6725                 return -EPERM;
6726 out:
6727         return err;
6728 }
6729
6730 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6731 {
6732         int status;
6733         struct nfs41_test_stateid_args args = {
6734                 .stateid = stateid,
6735         };
6736         struct nfs41_test_stateid_res res;
6737         struct rpc_message msg = {
6738                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6739                 .rpc_argp = &args,
6740                 .rpc_resp = &res,
6741         };
6742
6743         dprintk("NFS call  test_stateid %p\n", stateid);
6744         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6745         nfs4_set_sequence_privileged(&args.seq_args);
6746         status = nfs4_call_sync_sequence(server->client, server, &msg,
6747                         &args.seq_args, &res.seq_res);
6748         if (status != NFS_OK) {
6749                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6750                 return status;
6751         }
6752         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6753         return -res.status;
6754 }
6755
6756 /**
6757  * nfs41_test_stateid - perform a TEST_STATEID operation
6758  *
6759  * @server: server / transport on which to perform the operation
6760  * @stateid: state ID to test
6761  *
6762  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6763  * Otherwise a negative NFS4ERR value is returned if the operation
6764  * failed or the state ID is not currently valid.
6765  */
6766 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6767 {
6768         struct nfs4_exception exception = { };
6769         int err;
6770         do {
6771                 err = _nfs41_test_stateid(server, stateid);
6772                 if (err != -NFS4ERR_DELAY)
6773                         break;
6774                 nfs4_handle_exception(server, err, &exception);
6775         } while (exception.retry);
6776         return err;
6777 }
6778
6779 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6780 {
6781         struct nfs41_free_stateid_args args = {
6782                 .stateid = stateid,
6783         };
6784         struct nfs41_free_stateid_res res;
6785         struct rpc_message msg = {
6786                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6787                 .rpc_argp = &args,
6788                 .rpc_resp = &res,
6789         };
6790         int status;
6791
6792         dprintk("NFS call  free_stateid %p\n", stateid);
6793         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6794         nfs4_set_sequence_privileged(&args.seq_args);
6795         status = nfs4_call_sync_sequence(server->client, server, &msg,
6796                         &args.seq_args, &res.seq_res);
6797         dprintk("NFS reply free_stateid: %d\n", status);
6798         return status;
6799 }
6800
6801 /**
6802  * nfs41_free_stateid - perform a FREE_STATEID operation
6803  *
6804  * @server: server / transport on which to perform the operation
6805  * @stateid: state ID to release
6806  *
6807  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6808  * negative NFS4ERR value is returned.
6809  */
6810 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6811 {
6812         struct nfs4_exception exception = { };
6813         int err;
6814         do {
6815                 err = _nfs4_free_stateid(server, stateid);
6816                 if (err != -NFS4ERR_DELAY)
6817                         break;
6818                 nfs4_handle_exception(server, err, &exception);
6819         } while (exception.retry);
6820         return err;
6821 }
6822
6823 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6824                 const nfs4_stateid *s2)
6825 {
6826         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6827                 return false;
6828
6829         if (s1->seqid == s2->seqid)
6830                 return true;
6831         if (s1->seqid == 0 || s2->seqid == 0)
6832                 return true;
6833
6834         return false;
6835 }
6836
6837 #endif /* CONFIG_NFS_V4_1 */
6838
6839 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6840                 const nfs4_stateid *s2)
6841 {
6842         return nfs4_stateid_match(s1, s2);
6843 }
6844
6845
6846 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6847         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6848         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6849         .recover_open   = nfs4_open_reclaim,
6850         .recover_lock   = nfs4_lock_reclaim,
6851         .establish_clid = nfs4_init_clientid,
6852         .get_clid_cred  = nfs4_get_setclientid_cred,
6853         .detect_trunking = nfs40_discover_server_trunking,
6854 };
6855
6856 #if defined(CONFIG_NFS_V4_1)
6857 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6858         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6859         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6860         .recover_open   = nfs4_open_reclaim,
6861         .recover_lock   = nfs4_lock_reclaim,
6862         .establish_clid = nfs41_init_clientid,
6863         .get_clid_cred  = nfs4_get_exchange_id_cred,
6864         .reclaim_complete = nfs41_proc_reclaim_complete,
6865         .detect_trunking = nfs41_discover_server_trunking,
6866 };
6867 #endif /* CONFIG_NFS_V4_1 */
6868
6869 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6870         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6871         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6872         .recover_open   = nfs4_open_expired,
6873         .recover_lock   = nfs4_lock_expired,
6874         .establish_clid = nfs4_init_clientid,
6875         .get_clid_cred  = nfs4_get_setclientid_cred,
6876 };
6877
6878 #if defined(CONFIG_NFS_V4_1)
6879 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6880         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6881         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6882         .recover_open   = nfs41_open_expired,
6883         .recover_lock   = nfs41_lock_expired,
6884         .establish_clid = nfs41_init_clientid,
6885         .get_clid_cred  = nfs4_get_exchange_id_cred,
6886 };
6887 #endif /* CONFIG_NFS_V4_1 */
6888
6889 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6890         .sched_state_renewal = nfs4_proc_async_renew,
6891         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6892         .renew_lease = nfs4_proc_renew,
6893 };
6894
6895 #if defined(CONFIG_NFS_V4_1)
6896 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6897         .sched_state_renewal = nfs41_proc_async_sequence,
6898         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6899         .renew_lease = nfs4_proc_sequence,
6900 };
6901 #endif
6902
6903 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6904         .minor_version = 0,
6905         .init_caps = NFS_CAP_READDIRPLUS
6906                 | NFS_CAP_ATOMIC_OPEN
6907                 | NFS_CAP_CHANGE_ATTR
6908                 | NFS_CAP_POSIX_LOCK,
6909         .call_sync = _nfs4_call_sync,
6910         .match_stateid = nfs4_match_stateid,
6911         .find_root_sec = nfs4_find_root_sec,
6912         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6913         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6914         .state_renewal_ops = &nfs40_state_renewal_ops,
6915 };
6916
6917 #if defined(CONFIG_NFS_V4_1)
6918 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6919         .minor_version = 1,
6920         .init_caps = NFS_CAP_READDIRPLUS
6921                 | NFS_CAP_ATOMIC_OPEN
6922                 | NFS_CAP_CHANGE_ATTR
6923                 | NFS_CAP_POSIX_LOCK
6924                 | NFS_CAP_STATEID_NFSV41
6925                 | NFS_CAP_ATOMIC_OPEN_V1,
6926         .call_sync = nfs4_call_sync_sequence,
6927         .match_stateid = nfs41_match_stateid,
6928         .find_root_sec = nfs41_find_root_sec,
6929         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6930         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6931         .state_renewal_ops = &nfs41_state_renewal_ops,
6932 };
6933 #endif
6934
6935 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6936         [0] = &nfs_v4_0_minor_ops,
6937 #if defined(CONFIG_NFS_V4_1)
6938         [1] = &nfs_v4_1_minor_ops,
6939 #endif
6940 };
6941
6942 const struct inode_operations nfs4_dir_inode_operations = {
6943         .create         = nfs_create,
6944         .lookup         = nfs_lookup,
6945         .atomic_open    = nfs_atomic_open,
6946         .link           = nfs_link,
6947         .unlink         = nfs_unlink,
6948         .symlink        = nfs_symlink,
6949         .mkdir          = nfs_mkdir,
6950         .rmdir          = nfs_rmdir,
6951         .mknod          = nfs_mknod,
6952         .rename         = nfs_rename,
6953         .permission     = nfs_permission,
6954         .getattr        = nfs_getattr,
6955         .setattr        = nfs_setattr,
6956         .getxattr       = generic_getxattr,
6957         .setxattr       = generic_setxattr,
6958         .listxattr      = generic_listxattr,
6959         .removexattr    = generic_removexattr,
6960 };
6961
6962 static const struct inode_operations nfs4_file_inode_operations = {
6963         .permission     = nfs_permission,
6964         .getattr        = nfs_getattr,
6965         .setattr        = nfs_setattr,
6966         .getxattr       = generic_getxattr,
6967         .setxattr       = generic_setxattr,
6968         .listxattr      = generic_listxattr,
6969         .removexattr    = generic_removexattr,
6970 };
6971
6972 const struct nfs_rpc_ops nfs_v4_clientops = {
6973         .version        = 4,                    /* protocol version */
6974         .dentry_ops     = &nfs4_dentry_operations,
6975         .dir_inode_ops  = &nfs4_dir_inode_operations,
6976         .file_inode_ops = &nfs4_file_inode_operations,
6977         .file_ops       = &nfs4_file_operations,
6978         .getroot        = nfs4_proc_get_root,
6979         .submount       = nfs4_submount,
6980         .try_mount      = nfs4_try_mount,
6981         .getattr        = nfs4_proc_getattr,
6982         .setattr        = nfs4_proc_setattr,
6983         .lookup         = nfs4_proc_lookup,
6984         .access         = nfs4_proc_access,
6985         .readlink       = nfs4_proc_readlink,
6986         .create         = nfs4_proc_create,
6987         .remove         = nfs4_proc_remove,
6988         .unlink_setup   = nfs4_proc_unlink_setup,
6989         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6990         .unlink_done    = nfs4_proc_unlink_done,
6991         .rename         = nfs4_proc_rename,
6992         .rename_setup   = nfs4_proc_rename_setup,
6993         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6994         .rename_done    = nfs4_proc_rename_done,
6995         .link           = nfs4_proc_link,
6996         .symlink        = nfs4_proc_symlink,
6997         .mkdir          = nfs4_proc_mkdir,
6998         .rmdir          = nfs4_proc_remove,
6999         .readdir        = nfs4_proc_readdir,
7000         .mknod          = nfs4_proc_mknod,
7001         .statfs         = nfs4_proc_statfs,
7002         .fsinfo         = nfs4_proc_fsinfo,
7003         .pathconf       = nfs4_proc_pathconf,
7004         .set_capabilities = nfs4_server_capabilities,
7005         .decode_dirent  = nfs4_decode_dirent,
7006         .read_setup     = nfs4_proc_read_setup,
7007         .read_pageio_init = pnfs_pageio_init_read,
7008         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7009         .read_done      = nfs4_read_done,
7010         .write_setup    = nfs4_proc_write_setup,
7011         .write_pageio_init = pnfs_pageio_init_write,
7012         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7013         .write_done     = nfs4_write_done,
7014         .commit_setup   = nfs4_proc_commit_setup,
7015         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7016         .commit_done    = nfs4_commit_done,
7017         .lock           = nfs4_proc_lock,
7018         .clear_acl_cache = nfs4_zap_acl_attr,
7019         .close_context  = nfs4_close_context,
7020         .open_context   = nfs4_atomic_open,
7021         .have_delegation = nfs4_have_delegation,
7022         .return_delegation = nfs4_inode_return_delegation,
7023         .alloc_client   = nfs4_alloc_client,
7024         .init_client    = nfs4_init_client,
7025         .free_client    = nfs4_free_client,
7026         .create_server  = nfs4_create_server,
7027         .clone_server   = nfs_clone_server,
7028 };
7029
7030 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7031         .prefix = XATTR_NAME_NFSV4_ACL,
7032         .list   = nfs4_xattr_list_nfs4_acl,
7033         .get    = nfs4_xattr_get_nfs4_acl,
7034         .set    = nfs4_xattr_set_nfs4_acl,
7035 };
7036
7037 const struct xattr_handler *nfs4_xattr_handlers[] = {
7038         &nfs4_xattr_nfs4_acl_handler,
7039         NULL
7040 };
7041
7042 /*
7043  * Local variables:
7044  *  c-basic-offset: 8
7045  * End:
7046  */