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         int rpc_status;
 773         int cancelled;
 774 };
 775
 776 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 777                 int err, struct nfs4_exception *exception)
 778 {
 779         if (err != -EINVAL)
 780                 return false;
 781         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 782                 return false;
 783         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 784         exception->retry = 1;
 785         return true;
 786 }
 787
 788 static enum open_claim_type4
 789 nfs4_map_atomic_open_claim(struct nfs_server *server,
 790                 enum open_claim_type4 claim)
 791 {
 792         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 793                 return claim;
 794         switch (claim) {
 795         default:
 796                 return claim;
 797         case NFS4_OPEN_CLAIM_FH:
 798                 return NFS4_OPEN_CLAIM_NULL;
 799         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 800                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 801         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 802                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 803         }
 804 }
 805
 806 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 807 {
 808         p->o_res.f_attr = &p->f_attr;
 809         p->o_res.seqid = p->o_arg.seqid;
 810         p->c_res.seqid = p->c_arg.seqid;
 811         p->o_res.server = p->o_arg.server;
 812         p->o_res.access_request = p->o_arg.access;
 813         nfs_fattr_init(&p->f_attr);
 814         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 815 }
 816
 817 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 818                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 819                 const struct iattr *attrs,
 820                 enum open_claim_type4 claim,
 821                 gfp_t gfp_mask)
 822 {
 823         struct dentry *parent = dget_parent(dentry);
 824         struct inode *dir = parent->d_inode;
 825         struct nfs_server *server = NFS_SERVER(dir);
 826         struct nfs4_opendata *p;
 827
 828         p = kzalloc(sizeof(*p), gfp_mask);
 829         if (p == NULL)
 830                 goto err;
 831         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 832         if (p->o_arg.seqid == NULL)
 833                 goto err_free;
 834         nfs_sb_active(dentry->d_sb);
 835         p->dentry = dget(dentry);
 836         p->dir = parent;
 837         p->owner = sp;
 838         atomic_inc(&sp->so_count);
 839         p->o_arg.open_flags = flags;
 840         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 841         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 842          * will return permission denied for all bits until close */
 843         if (!(flags & O_EXCL)) {
 844                 /* ask server to check for all possible rights as results
 845                  * are cached */
 846                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 847                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 848         }
 849         p->o_arg.clientid = server->nfs_client->cl_clientid;
 850         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 851         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 852         p->o_arg.name = &dentry->d_name;
 853         p->o_arg.server = server;
 854         p->o_arg.bitmask = server->attr_bitmask;
 855         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 856         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
 857         switch (p->o_arg.claim) {
 858         case NFS4_OPEN_CLAIM_NULL:
 859         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 860         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 861                 p->o_arg.fh = NFS_FH(dir);
 862                 break;
 863         case NFS4_OPEN_CLAIM_PREVIOUS:
 864         case NFS4_OPEN_CLAIM_FH:
 865         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 866         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 867                 p->o_arg.fh = NFS_FH(dentry->d_inode);
 868         }
 869         if (attrs != NULL && attrs->ia_valid != 0) {
 870                 __be32 verf[2];
 871
 872                 p->o_arg.u.attrs = &p->attrs;
 873                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 874
 875                 verf[0] = jiffies;
 876                 verf[1] = current->pid;
 877                 memcpy(p->o_arg.u.verifier.data, verf,
 878                                 sizeof(p->o_arg.u.verifier.data));
 879         }
 880         p->c_arg.fh = &p->o_res.fh;
 881         p->c_arg.stateid = &p->o_res.stateid;
 882         p->c_arg.seqid = p->o_arg.seqid;
 883         nfs4_init_opendata_res(p);
 884         kref_init(&p->kref);
 885         return p;
 886 err_free:
 887         kfree(p);
 888 err:
 889         dput(parent);
 890         return NULL;
 891 }
 892
 893 static void nfs4_opendata_free(struct kref *kref)
 894 {
 895         struct nfs4_opendata *p = container_of(kref,
 896                         struct nfs4_opendata, kref);
 897         struct super_block *sb = p->dentry->d_sb;
 898
 899         nfs_free_seqid(p->o_arg.seqid);
 900         if (p->state != NULL)
 901                 nfs4_put_open_state(p->state);
 902         nfs4_put_state_owner(p->owner);
 903         dput(p->dir);
 904         dput(p->dentry);
 905         nfs_sb_deactive(sb);
 906         nfs_fattr_free_names(&p->f_attr);
 907         kfree(p);
 908 }
 909
 910 static void nfs4_opendata_put(struct nfs4_opendata *p)
 911 {
 912         if (p != NULL)
 913                 kref_put(&p->kref, nfs4_opendata_free);
 914 }
 915
 916 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 917 {
 918         int ret;
 919
 920         ret = rpc_wait_for_completion_task(task);
 921         return ret;
 922 }
 923
 924 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 925 {
 926         int ret = 0;
 927
 928         if (open_mode & (O_EXCL|O_TRUNC))
 929                 goto out;
 930         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 931                 case FMODE_READ:
 932                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 933                                 && state->n_rdonly != 0;
 934                         break;
 935                 case FMODE_WRITE:
 936                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 937                                 && state->n_wronly != 0;
 938                         break;
 939                 case FMODE_READ|FMODE_WRITE:
 940                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 941                                 && state->n_rdwr != 0;
 942         }
 943 out:
 944         return ret;
 945 }
 946
 947 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 948 {
 949         if (delegation == NULL)
 950                 return 0;
 951         if ((delegation->type & fmode) != fmode)
 952                 return 0;
 953         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 954                 return 0;
 955         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
 956                 return 0;
 957         nfs_mark_delegation_referenced(delegation);
 958         return 1;
 959 }
 960
 961 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 962 {
 963         switch (fmode) {
 964                 case FMODE_WRITE:
 965                         state->n_wronly++;
 966                         break;
 967                 case FMODE_READ:
 968                         state->n_rdonly++;
 969                         break;
 970                 case FMODE_READ|FMODE_WRITE:
 971                         state->n_rdwr++;
 972         }
 973         nfs4_state_set_mode_locked(state, state->state | fmode);
 974 }
 975
 976 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 977 {
 978         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 979                 nfs4_stateid_copy(&state->stateid, stateid);
 980         nfs4_stateid_copy(&state->open_stateid, stateid);
 981         switch (fmode) {
 982                 case FMODE_READ:
 983                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 984                         break;
 985                 case FMODE_WRITE:
 986                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 987                         break;
 988                 case FMODE_READ|FMODE_WRITE:
 989                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 990         }
 991 }
 992
 993 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 994 {
 995         write_seqlock(&state->seqlock);
 996         nfs_set_open_stateid_locked(state, stateid, fmode);
 997         write_sequnlock(&state->seqlock);
 998 }
 999
1000 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1001 {
1002         /*
1003          * Protect the call to nfs4_state_set_mode_locked and
1004          * serialise the stateid update
1005          */
1006         write_seqlock(&state->seqlock);
1007         if (deleg_stateid != NULL) {
1008                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1009                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1010         }
1011         if (open_stateid != NULL)
1012                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1013         write_sequnlock(&state->seqlock);
1014         spin_lock(&state->owner->so_lock);
1015         update_open_stateflags(state, fmode);
1016         spin_unlock(&state->owner->so_lock);
1017 }
1018
1019 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1020 {
1021         struct nfs_inode *nfsi = NFS_I(state->inode);
1022         struct nfs_delegation *deleg_cur;
1023         int ret = 0;
1024
1025         fmode &= (FMODE_READ|FMODE_WRITE);
1026
1027         rcu_read_lock();
1028         deleg_cur = rcu_dereference(nfsi->delegation);
1029         if (deleg_cur == NULL)
1030                 goto no_delegation;
1031
1032         spin_lock(&deleg_cur->lock);
1033         if (nfsi->delegation != deleg_cur ||
1034            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1035             (deleg_cur->type & fmode) != fmode)
1036                 goto no_delegation_unlock;
1037
1038         if (delegation == NULL)
1039                 delegation = &deleg_cur->stateid;
1040         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1041                 goto no_delegation_unlock;
1042
1043         nfs_mark_delegation_referenced(deleg_cur);
1044         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1045         ret = 1;
1046 no_delegation_unlock:
1047         spin_unlock(&deleg_cur->lock);
1048 no_delegation:
1049         rcu_read_unlock();
1050
1051         if (!ret && open_stateid != NULL) {
1052                 __update_open_stateid(state, open_stateid, NULL, fmode);
1053                 ret = 1;
1054         }
1055
1056         return ret;
1057 }
1058
1059
1060 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1061 {
1062         struct nfs_delegation *delegation;
1063
1064         rcu_read_lock();
1065         delegation = rcu_dereference(NFS_I(inode)->delegation);
1066         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1067                 rcu_read_unlock();
1068                 return;
1069         }
1070         rcu_read_unlock();
1071         nfs4_inode_return_delegation(inode);
1072 }
1073
1074 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1075 {
1076         struct nfs4_state *state = opendata->state;
1077         struct nfs_inode *nfsi = NFS_I(state->inode);
1078         struct nfs_delegation *delegation;
1079         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1080         fmode_t fmode = opendata->o_arg.fmode;
1081         nfs4_stateid stateid;
1082         int ret = -EAGAIN;
1083
1084         for (;;) {
1085                 if (can_open_cached(state, fmode, open_mode)) {
1086                         spin_lock(&state->owner->so_lock);
1087                         if (can_open_cached(state, fmode, open_mode)) {
1088                                 update_open_stateflags(state, fmode);
1089                                 spin_unlock(&state->owner->so_lock);
1090                                 goto out_return_state;
1091                         }
1092                         spin_unlock(&state->owner->so_lock);
1093                 }
1094                 rcu_read_lock();
1095                 delegation = rcu_dereference(nfsi->delegation);
1096                 if (!can_open_delegated(delegation, fmode)) {
1097                         rcu_read_unlock();
1098                         break;
1099                 }
1100                 /* Save the delegation */
1101                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1102                 rcu_read_unlock();
1103                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1104                 if (ret != 0)
1105                         goto out;
1106                 ret = -EAGAIN;
1107
1108                 /* Try to update the stateid using the delegation */
1109                 if (update_open_stateid(state, NULL, &stateid, fmode))
1110                         goto out_return_state;
1111         }
1112 out:
1113         return ERR_PTR(ret);
1114 out_return_state:
1115         atomic_inc(&state->count);
1116         return state;
1117 }
1118
1119 static void
1120 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1121 {
1122         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1123         struct nfs_delegation *delegation;
1124         int delegation_flags = 0;
1125
1126         rcu_read_lock();
1127         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1128         if (delegation)
1129                 delegation_flags = delegation->flags;
1130         rcu_read_unlock();
1131         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1132                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1133                                    "returning a delegation for "
1134                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1135                                    clp->cl_hostname);
1136         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1137                 nfs_inode_set_delegation(state->inode,
1138                                          data->owner->so_cred,
1139                                          &data->o_res);
1140         else
1141                 nfs_inode_reclaim_delegation(state->inode,
1142                                              data->owner->so_cred,
1143                                              &data->o_res);
1144 }
1145
1146 /*
1147  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1148  * and update the nfs4_state.
1149  */
1150 static struct nfs4_state *
1151 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1152 {
1153         struct inode *inode = data->state->inode;
1154         struct nfs4_state *state = data->state;
1155         int ret;
1156
1157         if (!data->rpc_done) {
1158                 ret = data->rpc_status;
1159                 goto err;
1160         }
1161
1162         ret = -ESTALE;
1163         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1164             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1165             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1166                 goto err;
1167
1168         ret = -ENOMEM;
1169         state = nfs4_get_open_state(inode, data->owner);
1170         if (state == NULL)
1171                 goto err;
1172
1173         ret = nfs_refresh_inode(inode, &data->f_attr);
1174         if (ret)
1175                 goto err;
1176
1177         if (data->o_res.delegation_type != 0)
1178                 nfs4_opendata_check_deleg(data, state);
1179         update_open_stateid(state, &data->o_res.stateid, NULL,
1180                             data->o_arg.fmode);
1181
1182         return state;
1183 err:
1184         return ERR_PTR(ret);
1185
1186 }
1187
1188 static struct nfs4_state *
1189 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1190 {
1191         struct inode *inode;
1192         struct nfs4_state *state = NULL;
1193         int ret;
1194
1195         if (!data->rpc_done) {
1196                 state = nfs4_try_open_cached(data);
1197                 goto out;
1198         }
1199
1200         ret = -EAGAIN;
1201         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1202                 goto err;
1203         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1204         ret = PTR_ERR(inode);
1205         if (IS_ERR(inode))
1206                 goto err;
1207         ret = -ENOMEM;
1208         state = nfs4_get_open_state(inode, data->owner);
1209         if (state == NULL)
1210                 goto err_put_inode;
1211         if (data->o_res.delegation_type != 0)
1212                 nfs4_opendata_check_deleg(data, state);
1213         update_open_stateid(state, &data->o_res.stateid, NULL,
1214                         data->o_arg.fmode);
1215         iput(inode);
1216 out:
1217         nfs_release_seqid(data->o_arg.seqid);
1218         return state;
1219 err_put_inode:
1220         iput(inode);
1221 err:
1222         return ERR_PTR(ret);
1223 }
1224
1225 static struct nfs4_state *
1226 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1227 {
1228         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1229                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1230         return _nfs4_opendata_to_nfs4_state(data);
1231 }
1232
1233 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1234 {
1235         struct nfs_inode *nfsi = NFS_I(state->inode);
1236         struct nfs_open_context *ctx;
1237
1238         spin_lock(&state->inode->i_lock);
1239         list_for_each_entry(ctx, &nfsi->open_files, list) {
1240                 if (ctx->state != state)
1241                         continue;
1242                 get_nfs_open_context(ctx);
1243                 spin_unlock(&state->inode->i_lock);
1244                 return ctx;
1245         }
1246         spin_unlock(&state->inode->i_lock);
1247         return ERR_PTR(-ENOENT);
1248 }
1249
1250 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1251                 struct nfs4_state *state, enum open_claim_type4 claim)
1252 {
1253         struct nfs4_opendata *opendata;
1254
1255         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1256                         NULL, claim, GFP_NOFS);
1257         if (opendata == NULL)
1258                 return ERR_PTR(-ENOMEM);
1259         opendata->state = state;
1260         atomic_inc(&state->count);
1261         return opendata;
1262 }
1263
1264 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1265 {
1266         struct nfs4_state *newstate;
1267         int ret;
1268
1269         opendata->o_arg.open_flags = 0;
1270         opendata->o_arg.fmode = fmode;
1271         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1272         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1273         nfs4_init_opendata_res(opendata);
1274         ret = _nfs4_recover_proc_open(opendata);
1275         if (ret != 0)
1276                 return ret;
1277         newstate = nfs4_opendata_to_nfs4_state(opendata);
1278         if (IS_ERR(newstate))
1279                 return PTR_ERR(newstate);
1280         nfs4_close_state(newstate, fmode);
1281         *res = newstate;
1282         return 0;
1283 }
1284
1285 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1286 {
1287         struct nfs4_state *newstate;
1288         int ret;
1289
1290         /* memory barrier prior to reading state->n_* */
1291         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1292         smp_rmb();
1293         if (state->n_rdwr != 0) {
1294                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1295                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1296                 if (ret != 0)
1297                         return ret;
1298                 if (newstate != state)
1299                         return -ESTALE;
1300         }
1301         if (state->n_wronly != 0) {
1302                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1303                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1304                 if (ret != 0)
1305                         return ret;
1306                 if (newstate != state)
1307                         return -ESTALE;
1308         }
1309         if (state->n_rdonly != 0) {
1310                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1311                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1312                 if (ret != 0)
1313                         return ret;
1314                 if (newstate != state)
1315                         return -ESTALE;
1316         }
1317         /*
1318          * We may have performed cached opens for all three recoveries.
1319          * Check if we need to update the current stateid.
1320          */
1321         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1322             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1323                 write_seqlock(&state->seqlock);
1324                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1325                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1326                 write_sequnlock(&state->seqlock);
1327         }
1328         return 0;
1329 }
1330
1331 /*
1332  * OPEN_RECLAIM:
1333  *      reclaim state on the server after a reboot.
1334  */
1335 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1336 {
1337         struct nfs_delegation *delegation;
1338         struct nfs4_opendata *opendata;
1339         fmode_t delegation_type = 0;
1340         int status;
1341
1342         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1343                         NFS4_OPEN_CLAIM_PREVIOUS);
1344         if (IS_ERR(opendata))
1345                 return PTR_ERR(opendata);
1346         rcu_read_lock();
1347         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1348         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1349                 delegation_type = delegation->type;
1350         rcu_read_unlock();
1351         opendata->o_arg.u.delegation_type = delegation_type;
1352         status = nfs4_open_recover(opendata, state);
1353         nfs4_opendata_put(opendata);
1354         return status;
1355 }
1356
1357 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1358 {
1359         struct nfs_server *server = NFS_SERVER(state->inode);
1360         struct nfs4_exception exception = { };
1361         int err;
1362         do {
1363                 err = _nfs4_do_open_reclaim(ctx, state);
1364                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1365                         continue;
1366                 if (err != -NFS4ERR_DELAY)
1367                         break;
1368                 nfs4_handle_exception(server, err, &exception);
1369         } while (exception.retry);
1370         return err;
1371 }
1372
1373 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1374 {
1375         struct nfs_open_context *ctx;
1376         int ret;
1377
1378         ctx = nfs4_state_find_open_context(state);
1379         if (IS_ERR(ctx))
1380                 return -EAGAIN;
1381         ret = nfs4_do_open_reclaim(ctx, state);
1382         put_nfs_open_context(ctx);
1383         return ret;
1384 }
1385
1386 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1387 {
1388         switch (err) {
1389                 default:
1390                         printk(KERN_ERR "NFS: %s: unhandled error "
1391                                         "%d.\n", __func__, err);
1392                 case 0:
1393                 case -ENOENT:
1394                 case -ESTALE:
1395                         break;
1396                 case -NFS4ERR_BADSESSION:
1397                 case -NFS4ERR_BADSLOT:
1398                 case -NFS4ERR_BAD_HIGH_SLOT:
1399                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1400                 case -NFS4ERR_DEADSESSION:
1401                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1402                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1403                         return -EAGAIN;
1404                 case -NFS4ERR_STALE_CLIENTID:
1405                 case -NFS4ERR_STALE_STATEID:
1406                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1407                 case -NFS4ERR_EXPIRED:
1408                         /* Don't recall a delegation if it was lost */
1409                         nfs4_schedule_lease_recovery(server->nfs_client);
1410                         return -EAGAIN;
1411                 case -NFS4ERR_DELEG_REVOKED:
1412                 case -NFS4ERR_ADMIN_REVOKED:
1413                 case -NFS4ERR_BAD_STATEID:
1414                 case -NFS4ERR_OPENMODE:
1415                         nfs_inode_find_state_and_recover(state->inode,
1416                                         stateid);
1417                         nfs4_schedule_stateid_recovery(server, state);
1418                         return 0;
1419                 case -NFS4ERR_DELAY:
1420                 case -NFS4ERR_GRACE:
1421                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1422                         ssleep(1);
1423                         return -EAGAIN;
1424                 case -ENOMEM:
1425                 case -NFS4ERR_DENIED:
1426                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1427                         return 0;
1428         }
1429         return err;
1430 }
1431
1432 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1433 {
1434         struct nfs_server *server = NFS_SERVER(state->inode);
1435         struct nfs4_opendata *opendata;
1436         int err;
1437
1438         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1439                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1440         if (IS_ERR(opendata))
1441                 return PTR_ERR(opendata);
1442         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1443         err = nfs4_open_recover(opendata, state);
1444         nfs4_opendata_put(opendata);
1445         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1446 }
1447
1448 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1449 {
1450         struct nfs4_opendata *data = calldata;
1451
1452         data->rpc_status = task->tk_status;
1453         if (data->rpc_status == 0) {
1454                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1455                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1456                 renew_lease(data->o_res.server, data->timestamp);
1457                 data->rpc_done = 1;
1458         }
1459 }
1460
1461 static void nfs4_open_confirm_release(void *calldata)
1462 {
1463         struct nfs4_opendata *data = calldata;
1464         struct nfs4_state *state = NULL;
1465
1466         /* If this request hasn't been cancelled, do nothing */
1467         if (data->cancelled == 0)
1468                 goto out_free;
1469         /* In case of error, no cleanup! */
1470         if (!data->rpc_done)
1471                 goto out_free;
1472         state = nfs4_opendata_to_nfs4_state(data);
1473         if (!IS_ERR(state))
1474                 nfs4_close_state(state, data->o_arg.fmode);
1475 out_free:
1476         nfs4_opendata_put(data);
1477 }
1478
1479 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1480         .rpc_call_done = nfs4_open_confirm_done,
1481         .rpc_release = nfs4_open_confirm_release,
1482 };
1483
1484 /*
1485  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1486  */
1487 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1488 {
1489         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1490         struct rpc_task *task;
1491         struct  rpc_message msg = {
1492                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1493                 .rpc_argp = &data->c_arg,
1494                 .rpc_resp = &data->c_res,
1495                 .rpc_cred = data->owner->so_cred,
1496         };
1497         struct rpc_task_setup task_setup_data = {
1498                 .rpc_client = server->client,
1499                 .rpc_message = &msg,
1500                 .callback_ops = &nfs4_open_confirm_ops,
1501                 .callback_data = data,
1502                 .workqueue = nfsiod_workqueue,
1503                 .flags = RPC_TASK_ASYNC,
1504         };
1505         int status;
1506
1507         kref_get(&data->kref);
1508         data->rpc_done = 0;
1509         data->rpc_status = 0;
1510         data->timestamp = jiffies;
1511         task = rpc_run_task(&task_setup_data);
1512         if (IS_ERR(task))
1513                 return PTR_ERR(task);
1514         status = nfs4_wait_for_completion_rpc_task(task);
1515         if (status != 0) {
1516                 data->cancelled = 1;
1517                 smp_wmb();
1518         } else
1519                 status = data->rpc_status;
1520         rpc_put_task(task);
1521         return status;
1522 }
1523
1524 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1525 {
1526         struct nfs4_opendata *data = calldata;
1527         struct nfs4_state_owner *sp = data->owner;
1528
1529         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1530                 goto out_wait;
1531         /*
1532          * Check if we still need to send an OPEN call, or if we can use
1533          * a delegation instead.
1534          */
1535         if (data->state != NULL) {
1536                 struct nfs_delegation *delegation;
1537
1538                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1539                         goto out_no_action;
1540                 rcu_read_lock();
1541                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1542                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1543                     can_open_delegated(delegation, data->o_arg.fmode))
1544                         goto unlock_no_action;
1545                 rcu_read_unlock();
1546         }
1547         /* Update client id. */
1548         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1549         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1550                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1551                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1552                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1553         }
1554         data->timestamp = jiffies;
1555         if (nfs4_setup_sequence(data->o_arg.server,
1556                                 &data->o_arg.seq_args,
1557                                 &data->o_res.seq_res,
1558                                 task) != 0)
1559                 nfs_release_seqid(data->o_arg.seqid);
1560         return;
1561 unlock_no_action:
1562         rcu_read_unlock();
1563 out_no_action:
1564         task->tk_action = NULL;
1565 out_wait:
1566         nfs4_sequence_done(task, &data->o_res.seq_res);
1567 }
1568
1569 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1570 {
1571         struct nfs4_opendata *data = calldata;
1572
1573         data->rpc_status = task->tk_status;
1574
1575         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1576                 return;
1577
1578         if (task->tk_status == 0) {
1579                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1580                         switch (data->o_res.f_attr->mode & S_IFMT) {
1581                         case S_IFREG:
1582                                 break;
1583                         case S_IFLNK:
1584                                 data->rpc_status = -ELOOP;
1585                                 break;
1586                         case S_IFDIR:
1587                                 data->rpc_status = -EISDIR;
1588                                 break;
1589                         default:
1590                                 data->rpc_status = -ENOTDIR;
1591                         }
1592                 }
1593                 renew_lease(data->o_res.server, data->timestamp);
1594                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1595                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1596         }
1597         data->rpc_done = 1;
1598 }
1599
1600 static void nfs4_open_release(void *calldata)
1601 {
1602         struct nfs4_opendata *data = calldata;
1603         struct nfs4_state *state = NULL;
1604
1605         /* If this request hasn't been cancelled, do nothing */
1606         if (data->cancelled == 0)
1607                 goto out_free;
1608         /* In case of error, no cleanup! */
1609         if (data->rpc_status != 0 || !data->rpc_done)
1610                 goto out_free;
1611         /* In case we need an open_confirm, no cleanup! */
1612         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1613                 goto out_free;
1614         state = nfs4_opendata_to_nfs4_state(data);
1615         if (!IS_ERR(state))
1616                 nfs4_close_state(state, data->o_arg.fmode);
1617 out_free:
1618         nfs4_opendata_put(data);
1619 }
1620
1621 static const struct rpc_call_ops nfs4_open_ops = {
1622         .rpc_call_prepare = nfs4_open_prepare,
1623         .rpc_call_done = nfs4_open_done,
1624         .rpc_release = nfs4_open_release,
1625 };
1626
1627 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1628 {
1629         struct inode *dir = data->dir->d_inode;
1630         struct nfs_server *server = NFS_SERVER(dir);
1631         struct nfs_openargs *o_arg = &data->o_arg;
1632         struct nfs_openres *o_res = &data->o_res;
1633         struct rpc_task *task;
1634         struct rpc_message msg = {
1635                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1636                 .rpc_argp = o_arg,
1637                 .rpc_resp = o_res,
1638                 .rpc_cred = data->owner->so_cred,
1639         };
1640         struct rpc_task_setup task_setup_data = {
1641                 .rpc_client = server->client,
1642                 .rpc_message = &msg,
1643                 .callback_ops = &nfs4_open_ops,
1644                 .callback_data = data,
1645                 .workqueue = nfsiod_workqueue,
1646                 .flags = RPC_TASK_ASYNC,
1647         };
1648         int status;
1649
1650         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1651         kref_get(&data->kref);
1652         data->rpc_done = 0;
1653         data->rpc_status = 0;
1654         data->cancelled = 0;
1655         if (isrecover)
1656                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1657         task = rpc_run_task(&task_setup_data);
1658         if (IS_ERR(task))
1659                 return PTR_ERR(task);
1660         status = nfs4_wait_for_completion_rpc_task(task);
1661         if (status != 0) {
1662                 data->cancelled = 1;
1663                 smp_wmb();
1664         } else
1665                 status = data->rpc_status;
1666         rpc_put_task(task);
1667
1668         return status;
1669 }
1670
1671 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1672 {
1673         struct inode *dir = data->dir->d_inode;
1674         struct nfs_openres *o_res = &data->o_res;
1675         int status;
1676
1677         status = nfs4_run_open_task(data, 1);
1678         if (status != 0 || !data->rpc_done)
1679                 return status;
1680
1681         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1682
1683         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1684                 status = _nfs4_proc_open_confirm(data);
1685                 if (status != 0)
1686                         return status;
1687         }
1688
1689         return status;
1690 }
1691
1692 static int nfs4_opendata_access(struct rpc_cred *cred,
1693                                 struct nfs4_opendata *opendata,
1694                                 struct nfs4_state *state, fmode_t fmode,
1695                                 int openflags)
1696 {
1697         struct nfs_access_entry cache;
1698         u32 mask;
1699
1700         /* access call failed or for some reason the server doesn't
1701          * support any access modes -- defer access call until later */
1702         if (opendata->o_res.access_supported == 0)
1703                 return 0;
1704
1705         mask = 0;
1706         /* don't check MAY_WRITE - a newly created file may not have
1707          * write mode bits, but POSIX allows the creating process to write.
1708          * use openflags to check for exec, because fmode won't
1709          * always have FMODE_EXEC set when file open for exec. */
1710         if (openflags & __FMODE_EXEC) {
1711                 /* ONLY check for exec rights */
1712                 mask = MAY_EXEC;
1713         } else if (fmode & FMODE_READ)
1714                 mask = MAY_READ;
1715
1716         cache.cred = cred;
1717         cache.jiffies = jiffies;
1718         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1719         nfs_access_add_cache(state->inode, &cache);
1720
1721         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1722                 return 0;
1723
1724         /* even though OPEN succeeded, access is denied. Close the file */
1725         nfs4_close_state(state, fmode);
1726         return -EACCES;
1727 }
1728
1729 /*
1730  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1731  */
1732 static int _nfs4_proc_open(struct nfs4_opendata *data)
1733 {
1734         struct inode *dir = data->dir->d_inode;
1735         struct nfs_server *server = NFS_SERVER(dir);
1736         struct nfs_openargs *o_arg = &data->o_arg;
1737         struct nfs_openres *o_res = &data->o_res;
1738         int status;
1739
1740         status = nfs4_run_open_task(data, 0);
1741         if (!data->rpc_done)
1742                 return status;
1743         if (status != 0) {
1744                 if (status == -NFS4ERR_BADNAME &&
1745                                 !(o_arg->open_flags & O_CREAT))
1746                         return -ENOENT;
1747                 return status;
1748         }
1749
1750         nfs_fattr_map_and_free_names(server, &data->f_attr);
1751
1752         if (o_arg->open_flags & O_CREAT)
1753                 update_changeattr(dir, &o_res->cinfo);
1754         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1755                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1756         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1757                 status = _nfs4_proc_open_confirm(data);
1758                 if (status != 0)
1759                         return status;
1760         }
1761         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1762                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1763         return 0;
1764 }
1765
1766 static int nfs4_recover_expired_lease(struct nfs_server *server)
1767 {
1768         return nfs4_client_recover_expired_lease(server->nfs_client);
1769 }
1770
1771 /*
1772  * OPEN_EXPIRED:
1773  *      reclaim state on the server after a network partition.
1774  *      Assumes caller holds the appropriate lock
1775  */
1776 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1777 {
1778         struct nfs4_opendata *opendata;
1779         int ret;
1780
1781         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1782                         NFS4_OPEN_CLAIM_FH);
1783         if (IS_ERR(opendata))
1784                 return PTR_ERR(opendata);
1785         ret = nfs4_open_recover(opendata, state);
1786         if (ret == -ESTALE)
1787                 d_drop(ctx->dentry);
1788         nfs4_opendata_put(opendata);
1789         return ret;
1790 }
1791
1792 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1793 {
1794         struct nfs_server *server = NFS_SERVER(state->inode);
1795         struct nfs4_exception exception = { };
1796         int err;
1797
1798         do {
1799                 err = _nfs4_open_expired(ctx, state);
1800                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1801                         continue;
1802                 switch (err) {
1803                 default:
1804                         goto out;
1805                 case -NFS4ERR_GRACE:
1806                 case -NFS4ERR_DELAY:
1807                         nfs4_handle_exception(server, err, &exception);
1808                         err = 0;
1809                 }
1810         } while (exception.retry);
1811 out:
1812         return err;
1813 }
1814
1815 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1816 {
1817         struct nfs_open_context *ctx;
1818         int ret;
1819
1820         ctx = nfs4_state_find_open_context(state);
1821         if (IS_ERR(ctx))
1822                 return -EAGAIN;
1823         ret = nfs4_do_open_expired(ctx, state);
1824         put_nfs_open_context(ctx);
1825         return ret;
1826 }
1827
1828 #if defined(CONFIG_NFS_V4_1)
1829 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1830 {
1831         struct nfs_server *server = NFS_SERVER(state->inode);
1832         nfs4_stateid *stateid = &state->stateid;
1833         int status;
1834
1835         /* If a state reset has been done, test_stateid is unneeded */
1836         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1837                 return;
1838
1839         status = nfs41_test_stateid(server, stateid);
1840         if (status != NFS_OK) {
1841                 /* Free the stateid unless the server explicitly
1842                  * informs us the stateid is unrecognized. */
1843                 if (status != -NFS4ERR_BAD_STATEID)
1844                         nfs41_free_stateid(server, stateid);
1845                 nfs_remove_bad_delegation(state->inode);
1846
1847                 write_seqlock(&state->seqlock);
1848                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1849                 write_sequnlock(&state->seqlock);
1850                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1851         }
1852 }
1853
1854 /**
1855  * nfs41_check_open_stateid - possibly free an open stateid
1856  *
1857  * @state: NFSv4 state for an inode
1858  *
1859  * Returns NFS_OK if recovery for this stateid is now finished.
1860  * Otherwise a negative NFS4ERR value is returned.
1861  */
1862 static int nfs41_check_open_stateid(struct nfs4_state *state)
1863 {
1864         struct nfs_server *server = NFS_SERVER(state->inode);
1865         nfs4_stateid *stateid = &state->open_stateid;
1866         int status;
1867
1868         /* If a state reset has been done, test_stateid is unneeded */
1869         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1870             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1871             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1872                 return -NFS4ERR_BAD_STATEID;
1873
1874         status = nfs41_test_stateid(server, stateid);
1875         if (status != NFS_OK) {
1876                 /* Free the stateid unless the server explicitly
1877                  * informs us the stateid is unrecognized. */
1878                 if (status != -NFS4ERR_BAD_STATEID)
1879                         nfs41_free_stateid(server, stateid);
1880
1881                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1882                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1883                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1884         }
1885         return status;
1886 }
1887
1888 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1889 {
1890         int status;
1891
1892         nfs41_clear_delegation_stateid(state);
1893         status = nfs41_check_open_stateid(state);
1894         if (status != NFS_OK)
1895                 status = nfs4_open_expired(sp, state);
1896         return status;
1897 }
1898 #endif
1899
1900 /*
1901  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1902  * fields corresponding to attributes that were used to store the verifier.
1903  * Make sure we clobber those fields in the later setattr call
1904  */
1905 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1906 {
1907         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1908             !(sattr->ia_valid & ATTR_ATIME_SET))
1909                 sattr->ia_valid |= ATTR_ATIME;
1910
1911         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1912             !(sattr->ia_valid & ATTR_MTIME_SET))
1913                 sattr->ia_valid |= ATTR_MTIME;
1914 }
1915
1916 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1917                 fmode_t fmode,
1918                 int flags,
1919                 struct nfs4_state **res)
1920 {
1921         struct nfs4_state_owner *sp = opendata->owner;
1922         struct nfs_server *server = sp->so_server;
1923         struct nfs4_state *state;
1924         unsigned int seq;
1925         int ret;
1926
1927         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1928
1929         ret = _nfs4_proc_open(opendata);
1930         if (ret != 0)
1931                 goto out;
1932
1933         state = nfs4_opendata_to_nfs4_state(opendata);
1934         ret = PTR_ERR(state);
1935         if (IS_ERR(state))
1936                 goto out;
1937         if (server->caps & NFS_CAP_POSIX_LOCK)
1938                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1939
1940         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1941         if (ret != 0)
1942                 goto out;
1943
1944         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
1945                 nfs4_schedule_stateid_recovery(server, state);
1946         *res = state;
1947 out:
1948         return ret;
1949 }
1950
1951 /*
1952  * Returns a referenced nfs4_state
1953  */
1954 static int _nfs4_do_open(struct inode *dir,
1955                         struct dentry *dentry,
1956                         fmode_t fmode,
1957                         int flags,
1958                         struct iattr *sattr,
1959                         struct rpc_cred *cred,
1960                         struct nfs4_state **res,
1961                         struct nfs4_threshold **ctx_th)
1962 {
1963         struct nfs4_state_owner  *sp;
1964         struct nfs4_state     *state = NULL;
1965         struct nfs_server       *server = NFS_SERVER(dir);
1966         struct nfs4_opendata *opendata;
1967         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
1968         int status;
1969
1970         /* Protect against reboot recovery conflicts */
1971         status = -ENOMEM;
1972         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1973         if (sp == NULL) {
1974                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1975                 goto out_err;
1976         }
1977         status = nfs4_recover_expired_lease(server);
1978         if (status != 0)
1979                 goto err_put_state_owner;
1980         if (dentry->d_inode != NULL)
1981                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1982         status = -ENOMEM;
1983         if (dentry->d_inode)
1984                 claim = NFS4_OPEN_CLAIM_FH;
1985         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
1986                         claim, GFP_KERNEL);
1987         if (opendata == NULL)
1988                 goto err_put_state_owner;
1989
1990         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1991                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1992                 if (!opendata->f_attr.mdsthreshold)
1993                         goto err_opendata_put;
1994                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1995         }
1996         if (dentry->d_inode != NULL)
1997                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1998
1999         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
2000         if (status != 0)
2001                 goto err_opendata_put;
2002
2003         if (opendata->o_arg.open_flags & O_EXCL) {
2004                 nfs4_exclusive_attrset(opendata, sattr);
2005
2006                 nfs_fattr_init(opendata->o_res.f_attr);
2007                 status = nfs4_do_setattr(state->inode, cred,
2008                                 opendata->o_res.f_attr, sattr,
2009                                 state);
2010                 if (status == 0)
2011                         nfs_setattr_update_inode(state->inode, sattr);
2012                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2013         }
2014
2015         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2016                 *ctx_th = opendata->f_attr.mdsthreshold;
2017         else
2018                 kfree(opendata->f_attr.mdsthreshold);
2019         opendata->f_attr.mdsthreshold = NULL;
2020
2021         nfs4_opendata_put(opendata);
2022         nfs4_put_state_owner(sp);
2023         *res = state;
2024         return 0;
2025 err_opendata_put:
2026         kfree(opendata->f_attr.mdsthreshold);
2027         nfs4_opendata_put(opendata);
2028 err_put_state_owner:
2029         nfs4_put_state_owner(sp);
2030 out_err:
2031         *res = NULL;
2032         return status;
2033 }
2034
2035
2036 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2037                                         struct dentry *dentry,
2038                                         fmode_t fmode,
2039                                         int flags,
2040                                         struct iattr *sattr,
2041                                         struct rpc_cred *cred,
2042                                         struct nfs4_threshold **ctx_th)
2043 {
2044         struct nfs_server *server = NFS_SERVER(dir);
2045         struct nfs4_exception exception = { };
2046         struct nfs4_state *res;
2047         int status;
2048
2049         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2050         do {
2051                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2052                                        &res, ctx_th);
2053                 if (status == 0)
2054                         break;
2055                 /* NOTE: BAD_SEQID means the server and client disagree about the
2056                  * book-keeping w.r.t. state-changing operations
2057                  * (OPEN/CLOSE/LOCK/LOCKU...)
2058                  * It is actually a sign of a bug on the client or on the server.
2059                  *
2060                  * If we receive a BAD_SEQID error in the particular case of
2061                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2062                  * have unhashed the old state_owner for us, and that we can
2063                  * therefore safely retry using a new one. We should still warn
2064                  * the user though...
2065                  */
2066                 if (status == -NFS4ERR_BAD_SEQID) {
2067                         pr_warn_ratelimited("NFS: v4 server %s "
2068                                         " returned a bad sequence-id error!\n",
2069                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2070                         exception.retry = 1;
2071                         continue;
2072                 }
2073                 /*
2074                  * BAD_STATEID on OPEN means that the server cancelled our
2075                  * state before it received the OPEN_CONFIRM.
2076                  * Recover by retrying the request as per the discussion
2077                  * on Page 181 of RFC3530.
2078                  */
2079                 if (status == -NFS4ERR_BAD_STATEID) {
2080                         exception.retry = 1;
2081                         continue;
2082                 }
2083                 if (status == -EAGAIN) {
2084                         /* We must have found a delegation */
2085                         exception.retry = 1;
2086                         continue;
2087                 }
2088                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2089                         continue;
2090                 res = ERR_PTR(nfs4_handle_exception(server,
2091                                         status, &exception));
2092         } while (exception.retry);
2093         return res;
2094 }
2095
2096 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2097                             struct nfs_fattr *fattr, struct iattr *sattr,
2098                             struct nfs4_state *state)
2099 {
2100         struct nfs_server *server = NFS_SERVER(inode);
2101         struct nfs_setattrargs  arg = {
2102                 .fh             = NFS_FH(inode),
2103                 .iap            = sattr,
2104                 .server         = server,
2105                 .bitmask = server->attr_bitmask,
2106         };
2107         struct nfs_setattrres  res = {
2108                 .fattr          = fattr,
2109                 .server         = server,
2110         };
2111         struct rpc_message msg = {
2112                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2113                 .rpc_argp       = &arg,
2114                 .rpc_resp       = &res,
2115                 .rpc_cred       = cred,
2116         };
2117         unsigned long timestamp = jiffies;
2118         int status;
2119
2120         nfs_fattr_init(fattr);
2121
2122         if (state != NULL && nfs4_valid_open_stateid(state)) {
2123                 struct nfs_lockowner lockowner = {
2124                         .l_owner = current->files,
2125                         .l_pid = current->tgid,
2126                 };
2127                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2128                                 &lockowner);
2129         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2130                                 FMODE_WRITE)) {
2131                 /* Use that stateid */
2132         } else
2133                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2134
2135         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2136         if (status == 0 && state != NULL)
2137                 renew_lease(server, timestamp);
2138         return status;
2139 }
2140
2141 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2142                            struct nfs_fattr *fattr, struct iattr *sattr,
2143                            struct nfs4_state *state)
2144 {
2145         struct nfs_server *server = NFS_SERVER(inode);
2146         struct nfs4_exception exception = {
2147                 .state = state,
2148                 .inode = inode,
2149         };
2150         int err;
2151         do {
2152                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2153                 switch (err) {
2154                 case -NFS4ERR_OPENMODE:
2155                         if (state && !(state->state & FMODE_WRITE)) {
2156                                 err = -EBADF;
2157                                 if (sattr->ia_valid & ATTR_OPEN)
2158                                         err = -EACCES;
2159                                 goto out;
2160                         }
2161                 }
2162                 err = nfs4_handle_exception(server, err, &exception);
2163         } while (exception.retry);
2164 out:
2165         return err;
2166 }
2167
2168 struct nfs4_closedata {
2169         struct inode *inode;
2170         struct nfs4_state *state;
2171         struct nfs_closeargs arg;
2172         struct nfs_closeres res;
2173         struct nfs_fattr fattr;
2174         unsigned long timestamp;
2175         bool roc;
2176         u32 roc_barrier;
2177 };
2178
2179 static void nfs4_free_closedata(void *data)
2180 {
2181         struct nfs4_closedata *calldata = data;
2182         struct nfs4_state_owner *sp = calldata->state->owner;
2183         struct super_block *sb = calldata->state->inode->i_sb;
2184
2185         if (calldata->roc)
2186                 pnfs_roc_release(calldata->state->inode);
2187         nfs4_put_open_state(calldata->state);
2188         nfs_free_seqid(calldata->arg.seqid);
2189         nfs4_put_state_owner(sp);
2190         nfs_sb_deactive(sb);
2191         kfree(calldata);
2192 }
2193
2194 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2195                 fmode_t fmode)
2196 {
2197         spin_lock(&state->owner->so_lock);
2198         if (!(fmode & FMODE_READ))
2199                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2200         if (!(fmode & FMODE_WRITE))
2201                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2202         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2203         spin_unlock(&state->owner->so_lock);
2204 }
2205
2206 static void nfs4_close_done(struct rpc_task *task, void *data)
2207 {
2208         struct nfs4_closedata *calldata = data;
2209         struct nfs4_state *state = calldata->state;
2210         struct nfs_server *server = NFS_SERVER(calldata->inode);
2211
2212         dprintk("%s: begin!\n", __func__);
2213         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2214                 return;
2215         /* hmm. we are done with the inode, and in the process of freeing
2216          * the state_owner. we keep this around to process errors
2217          */
2218         switch (task->tk_status) {
2219                 case 0:
2220                         if (calldata->roc)
2221                                 pnfs_roc_set_barrier(state->inode,
2222                                                      calldata->roc_barrier);
2223                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2224                         renew_lease(server, calldata->timestamp);
2225                         nfs4_close_clear_stateid_flags(state,
2226                                         calldata->arg.fmode);
2227                         break;
2228                 case -NFS4ERR_STALE_STATEID:
2229                 case -NFS4ERR_OLD_STATEID:
2230                 case -NFS4ERR_BAD_STATEID:
2231                 case -NFS4ERR_EXPIRED:
2232                         if (calldata->arg.fmode == 0)
2233                                 break;
2234                 default:
2235                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2236                                 rpc_restart_call_prepare(task);
2237         }
2238         nfs_release_seqid(calldata->arg.seqid);
2239         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2240         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2241 }
2242
2243 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2244 {
2245         struct nfs4_closedata *calldata = data;
2246         struct nfs4_state *state = calldata->state;
2247         struct inode *inode = calldata->inode;
2248         int call_close = 0;
2249
2250         dprintk("%s: begin!\n", __func__);
2251         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2252                 goto out_wait;
2253
2254         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2255         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2256         spin_lock(&state->owner->so_lock);
2257         /* Calculate the change in open mode */
2258         if (state->n_rdwr == 0) {
2259                 if (state->n_rdonly == 0) {
2260                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2261                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2262                         calldata->arg.fmode &= ~FMODE_READ;
2263                 }
2264                 if (state->n_wronly == 0) {
2265                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2266                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2267                         calldata->arg.fmode &= ~FMODE_WRITE;
2268                 }
2269         }
2270         if (!nfs4_valid_open_stateid(state))
2271                 call_close = 0;
2272         spin_unlock(&state->owner->so_lock);
2273
2274         if (!call_close) {
2275                 /* Note: exit _without_ calling nfs4_close_done */
2276                 goto out_no_action;
2277         }
2278
2279         if (calldata->arg.fmode == 0) {
2280                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2281                 if (calldata->roc &&
2282                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2283                         nfs_release_seqid(calldata->arg.seqid);
2284                         goto out_wait;
2285                     }
2286         }
2287
2288         nfs_fattr_init(calldata->res.fattr);
2289         calldata->timestamp = jiffies;
2290         if (nfs4_setup_sequence(NFS_SERVER(inode),
2291                                 &calldata->arg.seq_args,
2292                                 &calldata->res.seq_res,
2293                                 task) != 0)
2294                 nfs_release_seqid(calldata->arg.seqid);
2295         dprintk("%s: done!\n", __func__);
2296         return;
2297 out_no_action:
2298         task->tk_action = NULL;
2299 out_wait:
2300         nfs4_sequence_done(task, &calldata->res.seq_res);
2301 }
2302
2303 static const struct rpc_call_ops nfs4_close_ops = {
2304         .rpc_call_prepare = nfs4_close_prepare,
2305         .rpc_call_done = nfs4_close_done,
2306         .rpc_release = nfs4_free_closedata,
2307 };
2308
2309 /*
2310  * It is possible for data to be read/written from a mem-mapped file
2311  * after the sys_close call (which hits the vfs layer as a flush).
2312  * This means that we can't safely call nfsv4 close on a file until
2313  * the inode is cleared. This in turn means that we are not good
2314  * NFSv4 citizens - we do not indicate to the server to update the file's
2315  * share state even when we are done with one of the three share
2316  * stateid's in the inode.
2317  *
2318  * NOTE: Caller must be holding the sp->so_owner semaphore!
2319  */
2320 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2321 {
2322         struct nfs_server *server = NFS_SERVER(state->inode);
2323         struct nfs4_closedata *calldata;
2324         struct nfs4_state_owner *sp = state->owner;
2325         struct rpc_task *task;
2326         struct rpc_message msg = {
2327                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2328                 .rpc_cred = state->owner->so_cred,
2329         };
2330         struct rpc_task_setup task_setup_data = {
2331                 .rpc_client = server->client,
2332                 .rpc_message = &msg,
2333                 .callback_ops = &nfs4_close_ops,
2334                 .workqueue = nfsiod_workqueue,
2335                 .flags = RPC_TASK_ASYNC,
2336         };
2337         int status = -ENOMEM;
2338
2339         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2340         if (calldata == NULL)
2341                 goto out;
2342         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2343         calldata->inode = state->inode;
2344         calldata->state = state;
2345         calldata->arg.fh = NFS_FH(state->inode);
2346         calldata->arg.stateid = &state->open_stateid;
2347         /* Serialization for the sequence id */
2348         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2349         if (calldata->arg.seqid == NULL)
2350                 goto out_free_calldata;
2351         calldata->arg.fmode = 0;
2352         calldata->arg.bitmask = server->cache_consistency_bitmask;
2353         calldata->res.fattr = &calldata->fattr;
2354         calldata->res.seqid = calldata->arg.seqid;
2355         calldata->res.server = server;
2356         calldata->roc = pnfs_roc(state->inode);
2357         nfs_sb_active(calldata->inode->i_sb);
2358
2359         msg.rpc_argp = &calldata->arg;
2360         msg.rpc_resp = &calldata->res;
2361         task_setup_data.callback_data = calldata;
2362         task = rpc_run_task(&task_setup_data);
2363         if (IS_ERR(task))
2364                 return PTR_ERR(task);
2365         status = 0;
2366         if (wait)
2367                 status = rpc_wait_for_completion_task(task);
2368         rpc_put_task(task);
2369         return status;
2370 out_free_calldata:
2371         kfree(calldata);
2372 out:
2373         nfs4_put_open_state(state);
2374         nfs4_put_state_owner(sp);
2375         return status;
2376 }
2377
2378 static struct inode *
2379 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2380 {
2381         struct nfs4_state *state;
2382
2383         /* Protect against concurrent sillydeletes */
2384         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2385                              ctx->cred, &ctx->mdsthreshold);
2386         if (IS_ERR(state))
2387                 return ERR_CAST(state);
2388         ctx->state = state;
2389         return igrab(state->inode);
2390 }
2391
2392 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2393 {
2394         if (ctx->state == NULL)
2395                 return;
2396         if (is_sync)
2397                 nfs4_close_sync(ctx->state, ctx->mode);
2398         else
2399                 nfs4_close_state(ctx->state, ctx->mode);
2400 }
2401
2402 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2403 {
2404         struct nfs4_server_caps_arg args = {
2405                 .fhandle = fhandle,
2406         };
2407         struct nfs4_server_caps_res res = {};
2408         struct rpc_message msg = {
2409                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2410                 .rpc_argp = &args,
2411                 .rpc_resp = &res,
2412         };
2413         int status;
2414
2415         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2416         if (status == 0) {
2417                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2418                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2419                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2420                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2421                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2422                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2423                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2424                         server->caps |= NFS_CAP_ACLS;
2425                 if (res.has_links != 0)
2426                         server->caps |= NFS_CAP_HARDLINKS;
2427                 if (res.has_symlinks != 0)
2428                         server->caps |= NFS_CAP_SYMLINKS;
2429                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2430                         server->caps |= NFS_CAP_FILEID;
2431                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2432                         server->caps |= NFS_CAP_MODE;
2433                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2434                         server->caps |= NFS_CAP_NLINK;
2435                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2436                         server->caps |= NFS_CAP_OWNER;
2437                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2438                         server->caps |= NFS_CAP_OWNER_GROUP;
2439                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2440                         server->caps |= NFS_CAP_ATIME;
2441                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2442                         server->caps |= NFS_CAP_CTIME;
2443                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2444                         server->caps |= NFS_CAP_MTIME;
2445
2446                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2447                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2448                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2449                 server->acl_bitmask = res.acl_bitmask;
2450                 server->fh_expire_type = res.fh_expire_type;
2451         }
2452
2453         return status;
2454 }
2455
2456 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2457 {
2458         struct nfs4_exception exception = { };
2459         int err;
2460         do {
2461                 err = nfs4_handle_exception(server,
2462                                 _nfs4_server_capabilities(server, fhandle),
2463                                 &exception);
2464         } while (exception.retry);
2465         return err;
2466 }
2467
2468 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2469                 struct nfs_fsinfo *info)
2470 {
2471         struct nfs4_lookup_root_arg args = {
2472                 .bitmask = nfs4_fattr_bitmap,
2473         };
2474         struct nfs4_lookup_res res = {
2475                 .server = server,
2476                 .fattr = info->fattr,
2477                 .fh = fhandle,
2478         };
2479         struct rpc_message msg = {
2480                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2481                 .rpc_argp = &args,
2482                 .rpc_resp = &res,
2483         };
2484
2485         nfs_fattr_init(info->fattr);
2486         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2487 }
2488
2489 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2490                 struct nfs_fsinfo *info)
2491 {
2492         struct nfs4_exception exception = { };
2493         int err;
2494         do {
2495                 err = _nfs4_lookup_root(server, fhandle, info);
2496                 switch (err) {
2497                 case 0:
2498                 case -NFS4ERR_WRONGSEC:
2499                         goto out;
2500                 default:
2501                         err = nfs4_handle_exception(server, err, &exception);
2502                 }
2503         } while (exception.retry);
2504 out:
2505         return err;
2506 }
2507
2508 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2509                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2510 {
2511         struct rpc_auth *auth;
2512         int ret;
2513
2514         auth = rpcauth_create(flavor, server->client);
2515         if (IS_ERR(auth)) {
2516                 ret = -EIO;
2517                 goto out;
2518         }
2519         ret = nfs4_lookup_root(server, fhandle, info);
2520 out:
2521         return ret;
2522 }
2523
2524 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2525                               struct nfs_fsinfo *info)
2526 {
2527         int i, len, status = 0;
2528         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2529
2530         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2531         if (len < 0)
2532                 return len;
2533
2534         for (i = 0; i < len; i++) {
2535                 /* AUTH_UNIX is the default flavor if none was specified,
2536                  * thus has already been tried. */
2537                 if (flav_array[i] == RPC_AUTH_UNIX)
2538                         continue;
2539
2540                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2541                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2542                         continue;
2543                 break;
2544         }
2545         /*
2546          * -EACCESS could mean that the user doesn't have correct permissions
2547          * to access the mount.  It could also mean that we tried to mount
2548          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2549          * existing mount programs don't handle -EACCES very well so it should
2550          * be mapped to -EPERM instead.
2551          */
2552         if (status == -EACCES)
2553                 status = -EPERM;
2554         return status;
2555 }
2556
2557 /*
2558  * get the file handle for the "/" directory on the server
2559  */
2560 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2561                          struct nfs_fsinfo *info)
2562 {
2563         int minor_version = server->nfs_client->cl_minorversion;
2564         int status = nfs4_lookup_root(server, fhandle, info);
2565         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2566                 /*
2567                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2568                  * by nfs4_map_errors() as this function exits.
2569                  */
2570                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2571         if (status == 0)
2572                 status = nfs4_server_capabilities(server, fhandle);
2573         if (status == 0)
2574                 status = nfs4_do_fsinfo(server, fhandle, info);
2575         return nfs4_map_errors(status);
2576 }
2577
2578 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2579                               struct nfs_fsinfo *info)
2580 {
2581         int error;
2582         struct nfs_fattr *fattr = info->fattr;
2583
2584         error = nfs4_server_capabilities(server, mntfh);
2585         if (error < 0) {
2586                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2587                 return error;
2588         }
2589
2590         error = nfs4_proc_getattr(server, mntfh, fattr);
2591         if (error < 0) {
2592                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2593                 return error;
2594         }
2595
2596         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2597             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2598                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2599
2600         return error;
2601 }
2602
2603 /*
2604  * Get locations and (maybe) other attributes of a referral.
2605  * Note that we'll actually follow the referral later when
2606  * we detect fsid mismatch in inode revalidation
2607  */
2608 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2609                              const struct qstr *name, struct nfs_fattr *fattr,
2610                              struct nfs_fh *fhandle)
2611 {
2612         int status = -ENOMEM;
2613         struct page *page = NULL;
2614         struct nfs4_fs_locations *locations = NULL;
2615
2616         page = alloc_page(GFP_KERNEL);
2617         if (page == NULL)
2618                 goto out;
2619         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2620         if (locations == NULL)
2621                 goto out;
2622
2623         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2624         if (status != 0)
2625                 goto out;
2626         /* Make sure server returned a different fsid for the referral */
2627         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2628                 dprintk("%s: server did not return a different fsid for"
2629                         " a referral at %s\n", __func__, name->name);
2630                 status = -EIO;
2631                 goto out;
2632         }
2633         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2634         nfs_fixup_referral_attributes(&locations->fattr);
2635
2636         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2637         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2638         memset(fhandle, 0, sizeof(struct nfs_fh));
2639 out:
2640         if (page)
2641                 __free_page(page);
2642         kfree(locations);
2643         return status;
2644 }
2645
2646 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2647 {
2648         struct nfs4_getattr_arg args = {
2649                 .fh = fhandle,
2650                 .bitmask = server->attr_bitmask,
2651         };
2652         struct nfs4_getattr_res res = {
2653                 .fattr = fattr,
2654                 .server = server,
2655         };
2656         struct rpc_message msg = {
2657                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2658                 .rpc_argp = &args,
2659                 .rpc_resp = &res,
2660         };
2661
2662         nfs_fattr_init(fattr);
2663         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2664 }
2665
2666 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2667 {
2668         struct nfs4_exception exception = { };
2669         int err;
2670         do {
2671                 err = nfs4_handle_exception(server,
2672                                 _nfs4_proc_getattr(server, fhandle, fattr),
2673                                 &exception);
2674         } while (exception.retry);
2675         return err;
2676 }
2677
2678 /*
2679  * The file is not closed if it is opened due to the a request to change
2680  * the size of the file. The open call will not be needed once the
2681  * VFS layer lookup-intents are implemented.
2682  *
2683  * Close is called when the inode is destroyed.
2684  * If we haven't opened the file for O_WRONLY, we
2685  * need to in the size_change case to obtain a stateid.
2686  *
2687  * Got race?
2688  * Because OPEN is always done by name in nfsv4, it is
2689  * possible that we opened a different file by the same
2690  * name.  We can recognize this race condition, but we
2691  * can't do anything about it besides returning an error.
2692  *
2693  * This will be fixed with VFS changes (lookup-intent).
2694  */
2695 static int
2696 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2697                   struct iattr *sattr)
2698 {
2699         struct inode *inode = dentry->d_inode;
2700         struct rpc_cred *cred = NULL;
2701         struct nfs4_state *state = NULL;
2702         int status;
2703
2704         if (pnfs_ld_layoutret_on_setattr(inode))
2705                 pnfs_commit_and_return_layout(inode);
2706
2707         nfs_fattr_init(fattr);
2708
2709         /* Deal with open(O_TRUNC) */
2710         if (sattr->ia_valid & ATTR_OPEN)
2711                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2712
2713         /* Optimization: if the end result is no change, don't RPC */
2714         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2715                 return 0;
2716
2717         /* Search for an existing open(O_WRITE) file */
2718         if (sattr->ia_valid & ATTR_FILE) {
2719                 struct nfs_open_context *ctx;
2720
2721                 ctx = nfs_file_open_context(sattr->ia_file);
2722                 if (ctx) {
2723                         cred = ctx->cred;
2724                         state = ctx->state;
2725                 }
2726         }
2727
2728         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2729         if (status == 0)
2730                 nfs_setattr_update_inode(inode, sattr);
2731         return status;
2732 }
2733
2734 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2735                 const struct qstr *name, struct nfs_fh *fhandle,
2736                 struct nfs_fattr *fattr)
2737 {
2738         struct nfs_server *server = NFS_SERVER(dir);
2739         int                    status;
2740         struct nfs4_lookup_arg args = {
2741                 .bitmask = server->attr_bitmask,
2742                 .dir_fh = NFS_FH(dir),
2743                 .name = name,
2744         };
2745         struct nfs4_lookup_res res = {
2746                 .server = server,
2747                 .fattr = fattr,
2748                 .fh = fhandle,
2749         };
2750         struct rpc_message msg = {
2751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2752                 .rpc_argp = &args,
2753                 .rpc_resp = &res,
2754         };
2755
2756         nfs_fattr_init(fattr);
2757
2758         dprintk("NFS call  lookup %s\n", name->name);
2759         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2760         dprintk("NFS reply lookup: %d\n", status);
2761         return status;
2762 }
2763
2764 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2765 {
2766         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2767                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2768         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2769         fattr->nlink = 2;
2770 }
2771
2772 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2773                                    struct qstr *name, struct nfs_fh *fhandle,
2774                                    struct nfs_fattr *fattr)
2775 {
2776         struct nfs4_exception exception = { };
2777         struct rpc_clnt *client = *clnt;
2778         int err;
2779         do {
2780                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2781                 switch (err) {
2782                 case -NFS4ERR_BADNAME:
2783                         err = -ENOENT;
2784                         goto out;
2785                 case -NFS4ERR_MOVED:
2786                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2787                         goto out;
2788                 case -NFS4ERR_WRONGSEC:
2789                         err = -EPERM;
2790                         if (client != *clnt)
2791                                 goto out;
2792
2793                         client = nfs4_create_sec_client(client, dir, name);
2794                         if (IS_ERR(client))
2795                                 return PTR_ERR(client);
2796
2797                         exception.retry = 1;
2798                         break;
2799                 default:
2800                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2801                 }
2802         } while (exception.retry);
2803
2804 out:
2805         if (err == 0)
2806                 *clnt = client;
2807         else if (client != *clnt)
2808                 rpc_shutdown_client(client);
2809
2810         return err;
2811 }
2812
2813 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2814                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2815 {
2816         int status;
2817         struct rpc_clnt *client = NFS_CLIENT(dir);
2818
2819         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2820         if (client != NFS_CLIENT(dir)) {
2821                 rpc_shutdown_client(client);
2822                 nfs_fixup_secinfo_attributes(fattr);
2823         }
2824         return status;
2825 }
2826
2827 struct rpc_clnt *
2828 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2829                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2830 {
2831         int status;
2832         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2833
2834         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2835         if (status < 0) {
2836                 rpc_shutdown_client(client);
2837                 return ERR_PTR(status);
2838         }
2839         return client;
2840 }
2841
2842 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2843 {
2844         struct nfs_server *server = NFS_SERVER(inode);
2845         struct nfs4_accessargs args = {
2846                 .fh = NFS_FH(inode),
2847                 .bitmask = server->cache_consistency_bitmask,
2848         };
2849         struct nfs4_accessres res = {
2850                 .server = server,
2851         };
2852         struct rpc_message msg = {
2853                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2854                 .rpc_argp = &args,
2855                 .rpc_resp = &res,
2856                 .rpc_cred = entry->cred,
2857         };
2858         int mode = entry->mask;
2859         int status;
2860
2861         /*
2862          * Determine which access bits we want to ask for...
2863          */
2864         if (mode & MAY_READ)
2865                 args.access |= NFS4_ACCESS_READ;
2866         if (S_ISDIR(inode->i_mode)) {
2867                 if (mode & MAY_WRITE)
2868                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2869                 if (mode & MAY_EXEC)
2870                         args.access |= NFS4_ACCESS_LOOKUP;
2871         } else {
2872                 if (mode & MAY_WRITE)
2873                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2874                 if (mode & MAY_EXEC)
2875                         args.access |= NFS4_ACCESS_EXECUTE;
2876         }
2877
2878         res.fattr = nfs_alloc_fattr();
2879         if (res.fattr == NULL)
2880                 return -ENOMEM;
2881
2882         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2883         if (!status) {
2884                 nfs_access_set_mask(entry, res.access);
2885                 nfs_refresh_inode(inode, res.fattr);
2886         }
2887         nfs_free_fattr(res.fattr);
2888         return status;
2889 }
2890
2891 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2892 {
2893         struct nfs4_exception exception = { };
2894         int err;
2895         do {
2896                 err = nfs4_handle_exception(NFS_SERVER(inode),
2897                                 _nfs4_proc_access(inode, entry),
2898                                 &exception);
2899         } while (exception.retry);
2900         return err;
2901 }
2902
2903 /*
2904  * TODO: For the time being, we don't try to get any attributes
2905  * along with any of the zero-copy operations READ, READDIR,
2906  * READLINK, WRITE.
2907  *
2908  * In the case of the first three, we want to put the GETATTR
2909  * after the read-type operation -- this is because it is hard
2910  * to predict the length of a GETATTR response in v4, and thus
2911  * align the READ data correctly.  This means that the GETATTR
2912  * may end up partially falling into the page cache, and we should
2913  * shift it into the 'tail' of the xdr_buf before processing.
2914  * To do this efficiently, we need to know the total length
2915  * of data received, which doesn't seem to be available outside
2916  * of the RPC layer.
2917  *
2918  * In the case of WRITE, we also want to put the GETATTR after
2919  * the operation -- in this case because we want to make sure
2920  * we get the post-operation mtime and size.
2921  *
2922  * Both of these changes to the XDR layer would in fact be quite
2923  * minor, but I decided to leave them for a subsequent patch.
2924  */
2925 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2926                 unsigned int pgbase, unsigned int pglen)
2927 {
2928         struct nfs4_readlink args = {
2929                 .fh       = NFS_FH(inode),
2930                 .pgbase   = pgbase,
2931                 .pglen    = pglen,
2932                 .pages    = &page,
2933         };
2934         struct nfs4_readlink_res res;
2935         struct rpc_message msg = {
2936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2937                 .rpc_argp = &args,
2938                 .rpc_resp = &res,
2939         };
2940
2941         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2942 }
2943
2944 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2945                 unsigned int pgbase, unsigned int pglen)
2946 {
2947         struct nfs4_exception exception = { };
2948         int err;
2949         do {
2950                 err = nfs4_handle_exception(NFS_SERVER(inode),
2951                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2952                                 &exception);
2953         } while (exception.retry);
2954         return err;
2955 }
2956
2957 /*
2958  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2959  */
2960 static int
2961 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2962                  int flags)
2963 {
2964         struct nfs_open_context *ctx;
2965         struct nfs4_state *state;
2966         int status = 0;
2967
2968         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2969         if (IS_ERR(ctx))
2970                 return PTR_ERR(ctx);
2971
2972         sattr->ia_mode &= ~current_umask();
2973         state = nfs4_do_open(dir, dentry, ctx->mode,
2974                         flags, sattr, ctx->cred,
2975                         &ctx->mdsthreshold);
2976         d_drop(dentry);
2977         if (IS_ERR(state)) {
2978                 status = PTR_ERR(state);
2979                 goto out;
2980         }
2981         d_add(dentry, igrab(state->inode));
2982         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2983         ctx->state = state;
2984 out:
2985         put_nfs_open_context(ctx);
2986         return status;
2987 }
2988
2989 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2990 {
2991         struct nfs_server *server = NFS_SERVER(dir);
2992         struct nfs_removeargs args = {
2993                 .fh = NFS_FH(dir),
2994                 .name = *name,
2995         };
2996         struct nfs_removeres res = {
2997                 .server = server,
2998         };
2999         struct rpc_message msg = {
3000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3001                 .rpc_argp = &args,
3002                 .rpc_resp = &res,
3003         };
3004         int status;
3005
3006         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3007         if (status == 0)
3008                 update_changeattr(dir, &res.cinfo);
3009         return status;
3010 }
3011
3012 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3013 {
3014         struct nfs4_exception exception = { };
3015         int err;
3016         do {
3017                 err = nfs4_handle_exception(NFS_SERVER(dir),
3018                                 _nfs4_proc_remove(dir, name),
3019                                 &exception);
3020         } while (exception.retry);
3021         return err;
3022 }
3023
3024 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3025 {
3026         struct nfs_server *server = NFS_SERVER(dir);
3027         struct nfs_removeargs *args = msg->rpc_argp;
3028         struct nfs_removeres *res = msg->rpc_resp;
3029
3030         res->server = server;
3031         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3032         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3033 }
3034
3035 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3036 {
3037         nfs4_setup_sequence(NFS_SERVER(data->dir),
3038                         &data->args.seq_args,
3039                         &data->res.seq_res,
3040                         task);
3041 }
3042
3043 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3044 {
3045         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3046
3047         if (!nfs4_sequence_done(task, &res->seq_res))
3048                 return 0;
3049         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3050                 return 0;
3051         update_changeattr(dir, &res->cinfo);
3052         return 1;
3053 }
3054
3055 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3056 {
3057         struct nfs_server *server = NFS_SERVER(dir);
3058         struct nfs_renameargs *arg = msg->rpc_argp;
3059         struct nfs_renameres *res = msg->rpc_resp;
3060
3061         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3062         res->server = server;
3063         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3064 }
3065
3066 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3067 {
3068         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3069                         &data->args.seq_args,
3070                         &data->res.seq_res,
3071                         task);
3072 }
3073
3074 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3075                                  struct inode *new_dir)
3076 {
3077         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3078
3079         if (!nfs4_sequence_done(task, &res->seq_res))
3080                 return 0;
3081         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3082                 return 0;
3083
3084         update_changeattr(old_dir, &res->old_cinfo);
3085         update_changeattr(new_dir, &res->new_cinfo);
3086         return 1;
3087 }
3088
3089 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3090                 struct inode *new_dir, struct qstr *new_name)
3091 {
3092         struct nfs_server *server = NFS_SERVER(old_dir);
3093         struct nfs_renameargs arg = {
3094                 .old_dir = NFS_FH(old_dir),
3095                 .new_dir = NFS_FH(new_dir),
3096                 .old_name = old_name,
3097                 .new_name = new_name,
3098         };
3099         struct nfs_renameres res = {
3100                 .server = server,
3101         };
3102         struct rpc_message msg = {
3103                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3104                 .rpc_argp = &arg,
3105                 .rpc_resp = &res,
3106         };
3107         int status = -ENOMEM;
3108
3109         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3110         if (!status) {
3111                 update_changeattr(old_dir, &res.old_cinfo);
3112                 update_changeattr(new_dir, &res.new_cinfo);
3113         }
3114         return status;
3115 }
3116
3117 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3118                 struct inode *new_dir, struct qstr *new_name)
3119 {
3120         struct nfs4_exception exception = { };
3121         int err;
3122         do {
3123                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3124                                 _nfs4_proc_rename(old_dir, old_name,
3125                                         new_dir, new_name),
3126                                 &exception);
3127         } while (exception.retry);
3128         return err;
3129 }
3130
3131 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3132 {
3133         struct nfs_server *server = NFS_SERVER(inode);
3134         struct nfs4_link_arg arg = {
3135                 .fh     = NFS_FH(inode),
3136                 .dir_fh = NFS_FH(dir),
3137                 .name   = name,
3138                 .bitmask = server->attr_bitmask,
3139         };
3140         struct nfs4_link_res res = {
3141                 .server = server,
3142         };
3143         struct rpc_message msg = {
3144                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3145                 .rpc_argp = &arg,
3146                 .rpc_resp = &res,
3147         };
3148         int status = -ENOMEM;
3149
3150         res.fattr = nfs_alloc_fattr();
3151         if (res.fattr == NULL)
3152                 goto out;
3153
3154         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3155         if (!status) {
3156                 update_changeattr(dir, &res.cinfo);
3157                 nfs_post_op_update_inode(inode, res.fattr);
3158         }
3159 out:
3160         nfs_free_fattr(res.fattr);
3161         return status;
3162 }
3163
3164 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3165 {
3166         struct nfs4_exception exception = { };
3167         int err;
3168         do {
3169                 err = nfs4_handle_exception(NFS_SERVER(inode),
3170                                 _nfs4_proc_link(inode, dir, name),
3171                                 &exception);
3172         } while (exception.retry);
3173         return err;
3174 }
3175
3176 struct nfs4_createdata {
3177         struct rpc_message msg;
3178         struct nfs4_create_arg arg;
3179         struct nfs4_create_res res;
3180         struct nfs_fh fh;
3181         struct nfs_fattr fattr;
3182 };
3183
3184 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3185                 struct qstr *name, struct iattr *sattr, u32 ftype)
3186 {
3187         struct nfs4_createdata *data;
3188
3189         data = kzalloc(sizeof(*data), GFP_KERNEL);
3190         if (data != NULL) {
3191                 struct nfs_server *server = NFS_SERVER(dir);
3192
3193                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3194                 data->msg.rpc_argp = &data->arg;
3195                 data->msg.rpc_resp = &data->res;
3196                 data->arg.dir_fh = NFS_FH(dir);
3197                 data->arg.server = server;
3198                 data->arg.name = name;
3199                 data->arg.attrs = sattr;
3200                 data->arg.ftype = ftype;
3201                 data->arg.bitmask = server->attr_bitmask;
3202                 data->res.server = server;
3203                 data->res.fh = &data->fh;
3204                 data->res.fattr = &data->fattr;
3205                 nfs_fattr_init(data->res.fattr);
3206         }
3207         return data;
3208 }
3209
3210 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3211 {
3212         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3213                                     &data->arg.seq_args, &data->res.seq_res, 1);
3214         if (status == 0) {
3215                 update_changeattr(dir, &data->res.dir_cinfo);
3216                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3217         }
3218         return status;
3219 }
3220
3221 static void nfs4_free_createdata(struct nfs4_createdata *data)
3222 {
3223         kfree(data);
3224 }
3225
3226 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3227                 struct page *page, unsigned int len, struct iattr *sattr)
3228 {
3229         struct nfs4_createdata *data;
3230         int status = -ENAMETOOLONG;
3231
3232         if (len > NFS4_MAXPATHLEN)
3233                 goto out;
3234
3235         status = -ENOMEM;
3236         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3237         if (data == NULL)
3238                 goto out;
3239
3240         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3241         data->arg.u.symlink.pages = &page;
3242         data->arg.u.symlink.len = len;
3243
3244         status = nfs4_do_create(dir, dentry, data);
3245
3246         nfs4_free_createdata(data);
3247 out:
3248         return status;
3249 }
3250
3251 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3252                 struct page *page, unsigned int len, struct iattr *sattr)
3253 {
3254         struct nfs4_exception exception = { };
3255         int err;
3256         do {
3257                 err = nfs4_handle_exception(NFS_SERVER(dir),
3258                                 _nfs4_proc_symlink(dir, dentry, page,
3259                                                         len, sattr),
3260                                 &exception);
3261         } while (exception.retry);
3262         return err;
3263 }
3264
3265 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3266                 struct iattr *sattr)
3267 {
3268         struct nfs4_createdata *data;
3269         int status = -ENOMEM;
3270
3271         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3272         if (data == NULL)
3273                 goto out;
3274
3275         status = nfs4_do_create(dir, dentry, data);
3276
3277         nfs4_free_createdata(data);
3278 out:
3279         return status;
3280 }
3281
3282 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3283                 struct iattr *sattr)
3284 {
3285         struct nfs4_exception exception = { };
3286         int err;
3287
3288         sattr->ia_mode &= ~current_umask();
3289         do {
3290                 err = nfs4_handle_exception(NFS_SERVER(dir),
3291                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3292                                 &exception);
3293         } while (exception.retry);
3294         return err;
3295 }
3296
3297 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3298                 u64 cookie, struct page **pages, unsigned int count, int plus)
3299 {
3300         struct inode            *dir = dentry->d_inode;
3301         struct nfs4_readdir_arg args = {
3302                 .fh = NFS_FH(dir),
3303                 .pages = pages,
3304                 .pgbase = 0,
3305                 .count = count,
3306                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3307                 .plus = plus,
3308         };
3309         struct nfs4_readdir_res res;
3310         struct rpc_message msg = {
3311                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3312                 .rpc_argp = &args,
3313                 .rpc_resp = &res,
3314                 .rpc_cred = cred,
3315         };
3316         int                     status;
3317
3318         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3319                         dentry->d_parent->d_name.name,
3320                         dentry->d_name.name,
3321                         (unsigned long long)cookie);
3322         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3323         res.pgbase = args.pgbase;
3324         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3325         if (status >= 0) {
3326                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3327                 status += args.pgbase;
3328         }
3329
3330         nfs_invalidate_atime(dir);
3331
3332         dprintk("%s: returns %d\n", __func__, status);
3333         return status;
3334 }
3335
3336 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3337                 u64 cookie, struct page **pages, unsigned int count, int plus)
3338 {
3339         struct nfs4_exception exception = { };
3340         int err;
3341         do {
3342                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3343                                 _nfs4_proc_readdir(dentry, cred, cookie,
3344                                         pages, count, plus),
3345                                 &exception);
3346         } while (exception.retry);
3347         return err;
3348 }
3349
3350 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3351                 struct iattr *sattr, dev_t rdev)
3352 {
3353         struct nfs4_createdata *data;
3354         int mode = sattr->ia_mode;
3355         int status = -ENOMEM;
3356
3357         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3358         if (data == NULL)
3359                 goto out;
3360
3361         if (S_ISFIFO(mode))
3362                 data->arg.ftype = NF4FIFO;
3363         else if (S_ISBLK(mode)) {
3364                 data->arg.ftype = NF4BLK;
3365                 data->arg.u.device.specdata1 = MAJOR(rdev);
3366                 data->arg.u.device.specdata2 = MINOR(rdev);
3367         }
3368         else if (S_ISCHR(mode)) {
3369                 data->arg.ftype = NF4CHR;
3370                 data->arg.u.device.specdata1 = MAJOR(rdev);
3371                 data->arg.u.device.specdata2 = MINOR(rdev);
3372         } else if (!S_ISSOCK(mode)) {
3373                 status = -EINVAL;
3374                 goto out_free;
3375         }
3376
3377         status = nfs4_do_create(dir, dentry, data);
3378 out_free:
3379         nfs4_free_createdata(data);
3380 out:
3381         return status;
3382 }
3383
3384 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3385                 struct iattr *sattr, dev_t rdev)
3386 {
3387         struct nfs4_exception exception = { };
3388         int err;
3389
3390         sattr->ia_mode &= ~current_umask();
3391         do {
3392                 err = nfs4_handle_exception(NFS_SERVER(dir),
3393                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3394                                 &exception);
3395         } while (exception.retry);
3396         return err;
3397 }
3398
3399 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3400                  struct nfs_fsstat *fsstat)
3401 {
3402         struct nfs4_statfs_arg args = {
3403                 .fh = fhandle,
3404                 .bitmask = server->attr_bitmask,
3405         };
3406         struct nfs4_statfs_res res = {
3407                 .fsstat = fsstat,
3408         };
3409         struct rpc_message msg = {
3410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3411                 .rpc_argp = &args,
3412                 .rpc_resp = &res,
3413         };
3414
3415         nfs_fattr_init(fsstat->fattr);
3416         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3417 }
3418
3419 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3420 {
3421         struct nfs4_exception exception = { };
3422         int err;
3423         do {
3424                 err = nfs4_handle_exception(server,
3425                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3426                                 &exception);
3427         } while (exception.retry);
3428         return err;
3429 }
3430
3431 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3432                 struct nfs_fsinfo *fsinfo)
3433 {
3434         struct nfs4_fsinfo_arg args = {
3435                 .fh = fhandle,
3436                 .bitmask = server->attr_bitmask,
3437         };
3438         struct nfs4_fsinfo_res res = {
3439                 .fsinfo = fsinfo,
3440         };
3441         struct rpc_message msg = {
3442                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3443                 .rpc_argp = &args,
3444                 .rpc_resp = &res,
3445         };
3446
3447         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3448 }
3449
3450 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3451 {
3452         struct nfs4_exception exception = { };
3453         int err;
3454
3455         do {
3456                 err = nfs4_handle_exception(server,
3457                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3458                                 &exception);
3459         } while (exception.retry);
3460         return err;
3461 }
3462
3463 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3464 {
3465         int error;
3466
3467         nfs_fattr_init(fsinfo->fattr);
3468         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3469         if (error == 0) {
3470                 /* block layout checks this! */
3471                 server->pnfs_blksize = fsinfo->blksize;
3472                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3473         }
3474
3475         return error;
3476 }
3477
3478 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3479                 struct nfs_pathconf *pathconf)
3480 {
3481         struct nfs4_pathconf_arg args = {
3482                 .fh = fhandle,
3483                 .bitmask = server->attr_bitmask,
3484         };
3485         struct nfs4_pathconf_res res = {
3486                 .pathconf = pathconf,
3487         };
3488         struct rpc_message msg = {
3489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3490                 .rpc_argp = &args,
3491                 .rpc_resp = &res,
3492         };
3493
3494         /* None of the pathconf attributes are mandatory to implement */
3495         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3496                 memset(pathconf, 0, sizeof(*pathconf));
3497                 return 0;
3498         }
3499
3500         nfs_fattr_init(pathconf->fattr);
3501         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3502 }
3503
3504 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3505                 struct nfs_pathconf *pathconf)
3506 {
3507         struct nfs4_exception exception = { };
3508         int err;
3509
3510         do {
3511                 err = nfs4_handle_exception(server,
3512                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3513                                 &exception);
3514         } while (exception.retry);
3515         return err;
3516 }
3517
3518 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3519                 const struct nfs_open_context *ctx,
3520                 const struct nfs_lock_context *l_ctx,
3521                 fmode_t fmode)
3522 {
3523         const struct nfs_lockowner *lockowner = NULL;
3524
3525         if (l_ctx != NULL)
3526                 lockowner = &l_ctx->lockowner;
3527         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3528 }
3529 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3530
3531 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3532                 const struct nfs_open_context *ctx,
3533                 const struct nfs_lock_context *l_ctx,
3534                 fmode_t fmode)
3535 {
3536         nfs4_stateid current_stateid;
3537
3538         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3539                 return false;
3540         return nfs4_stateid_match(stateid, &current_stateid);
3541 }
3542
3543 static bool nfs4_error_stateid_expired(int err)
3544 {
3545         switch (err) {
3546         case -NFS4ERR_DELEG_REVOKED:
3547         case -NFS4ERR_ADMIN_REVOKED:
3548         case -NFS4ERR_BAD_STATEID:
3549         case -NFS4ERR_STALE_STATEID:
3550         case -NFS4ERR_OLD_STATEID:
3551         case -NFS4ERR_OPENMODE:
3552         case -NFS4ERR_EXPIRED:
3553                 return true;
3554         }
3555         return false;
3556 }
3557
3558 void __nfs4_read_done_cb(struct nfs_read_data *data)
3559 {
3560         nfs_invalidate_atime(data->header->inode);
3561 }
3562
3563 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3564 {
3565         struct nfs_server *server = NFS_SERVER(data->header->inode);
3566
3567         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3568                 rpc_restart_call_prepare(task);
3569                 return -EAGAIN;
3570         }
3571
3572         __nfs4_read_done_cb(data);
3573         if (task->tk_status > 0)
3574                 renew_lease(server, data->timestamp);
3575         return 0;
3576 }
3577
3578 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3579                 struct nfs_readargs *args)
3580 {
3581
3582         if (!nfs4_error_stateid_expired(task->tk_status) ||
3583                 nfs4_stateid_is_current(&args->stateid,
3584                                 args->context,
3585                                 args->lock_context,
3586                                 FMODE_READ))
3587                 return false;
3588         rpc_restart_call_prepare(task);
3589         return true;
3590 }
3591
3592 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3593 {
3594
3595         dprintk("--> %s\n", __func__);
3596
3597         if (!nfs4_sequence_done(task, &data->res.seq_res))
3598                 return -EAGAIN;
3599         if (nfs4_read_stateid_changed(task, &data->args))
3600                 return -EAGAIN;
3601         return data->read_done_cb ? data->read_done_cb(task, data) :
3602                                     nfs4_read_done_cb(task, data);
3603 }
3604
3605 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3606 {
3607         data->timestamp   = jiffies;
3608         data->read_done_cb = nfs4_read_done_cb;
3609         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3610         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3611 }
3612
3613 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3614 {
3615         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3616                         &data->args.seq_args,
3617                         &data->res.seq_res,
3618                         task))
3619                 return;
3620         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3621                         data->args.lock_context, FMODE_READ);
3622 }
3623
3624 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3625 {
3626         struct inode *inode = data->header->inode;
3627
3628         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3629                 rpc_restart_call_prepare(task);
3630                 return -EAGAIN;
3631         }
3632         if (task->tk_status >= 0) {
3633                 renew_lease(NFS_SERVER(inode), data->timestamp);
3634                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3635         }
3636         return 0;
3637 }
3638
3639 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3640                 struct nfs_writeargs *args)
3641 {
3642
3643         if (!nfs4_error_stateid_expired(task->tk_status) ||
3644                 nfs4_stateid_is_current(&args->stateid,
3645                                 args->context,
3646                                 args->lock_context,
3647                                 FMODE_WRITE))
3648                 return false;
3649         rpc_restart_call_prepare(task);
3650         return true;
3651 }
3652
3653 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3654 {
3655         if (!nfs4_sequence_done(task, &data->res.seq_res))
3656                 return -EAGAIN;
3657         if (nfs4_write_stateid_changed(task, &data->args))
3658                 return -EAGAIN;
3659         return data->write_done_cb ? data->write_done_cb(task, data) :
3660                 nfs4_write_done_cb(task, data);
3661 }
3662
3663 static
3664 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3665 {
3666         const struct nfs_pgio_header *hdr = data->header;
3667
3668         /* Don't request attributes for pNFS or O_DIRECT writes */
3669         if (data->ds_clp != NULL || hdr->dreq != NULL)
3670                 return false;
3671         /* Otherwise, request attributes if and only if we don't hold
3672          * a delegation
3673          */
3674         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3675 }
3676
3677 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3678 {
3679         struct nfs_server *server = NFS_SERVER(data->header->inode);
3680
3681         if (!nfs4_write_need_cache_consistency_data(data)) {
3682                 data->args.bitmask = NULL;
3683                 data->res.fattr = NULL;
3684         } else
3685                 data->args.bitmask = server->cache_consistency_bitmask;
3686
3687         if (!data->write_done_cb)
3688                 data->write_done_cb = nfs4_write_done_cb;
3689         data->res.server = server;
3690         data->timestamp   = jiffies;
3691
3692         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3693         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3694 }
3695
3696 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3697 {
3698         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3699                         &data->args.seq_args,
3700                         &data->res.seq_res,
3701                         task))
3702                 return;
3703         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3704                         data->args.lock_context, FMODE_WRITE);
3705 }
3706
3707 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3708 {
3709         nfs4_setup_sequence(NFS_SERVER(data->inode),
3710                         &data->args.seq_args,
3711                         &data->res.seq_res,
3712                         task);
3713 }
3714
3715 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3716 {
3717         struct inode *inode = data->inode;
3718
3719         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3720                 rpc_restart_call_prepare(task);
3721                 return -EAGAIN;
3722         }
3723         return 0;
3724 }
3725
3726 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3727 {
3728         if (!nfs4_sequence_done(task, &data->res.seq_res))
3729                 return -EAGAIN;
3730         return data->commit_done_cb(task, data);
3731 }
3732
3733 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3734 {
3735         struct nfs_server *server = NFS_SERVER(data->inode);
3736
3737         if (data->commit_done_cb == NULL)
3738                 data->commit_done_cb = nfs4_commit_done_cb;
3739         data->res.server = server;
3740         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3741         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3742 }
3743
3744 struct nfs4_renewdata {
3745         struct nfs_client       *client;
3746         unsigned long           timestamp;
3747 };
3748
3749 /*
3750  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3751  * standalone procedure for queueing an asynchronous RENEW.
3752  */
3753 static void nfs4_renew_release(void *calldata)
3754 {
3755         struct nfs4_renewdata *data = calldata;
3756         struct nfs_client *clp = data->client;
3757
3758         if (atomic_read(&clp->cl_count) > 1)
3759                 nfs4_schedule_state_renewal(clp);
3760         nfs_put_client(clp);
3761         kfree(data);
3762 }
3763
3764 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3765 {
3766         struct nfs4_renewdata *data = calldata;
3767         struct nfs_client *clp = data->client;
3768         unsigned long timestamp = data->timestamp;
3769
3770         if (task->tk_status < 0) {
3771                 /* Unless we're shutting down, schedule state recovery! */
3772                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3773                         return;
3774                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3775                         nfs4_schedule_lease_recovery(clp);
3776                         return;
3777                 }
3778                 nfs4_schedule_path_down_recovery(clp);
3779         }
3780         do_renew_lease(clp, timestamp);
3781 }
3782
3783 static const struct rpc_call_ops nfs4_renew_ops = {
3784         .rpc_call_done = nfs4_renew_done,
3785         .rpc_release = nfs4_renew_release,
3786 };
3787
3788 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3789 {
3790         struct rpc_message msg = {
3791                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3792                 .rpc_argp       = clp,
3793                 .rpc_cred       = cred,
3794         };
3795         struct nfs4_renewdata *data;
3796
3797         if (renew_flags == 0)
3798                 return 0;
3799         if (!atomic_inc_not_zero(&clp->cl_count))
3800                 return -EIO;
3801         data = kmalloc(sizeof(*data), GFP_NOFS);
3802         if (data == NULL)
3803                 return -ENOMEM;
3804         data->client = clp;
3805         data->timestamp = jiffies;
3806         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
3807                         &nfs4_renew_ops, data);
3808 }
3809
3810 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3811 {
3812         struct rpc_message msg = {
3813                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3814                 .rpc_argp       = clp,
3815                 .rpc_cred       = cred,
3816         };
3817         unsigned long now = jiffies;
3818         int status;
3819
3820         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3821         if (status < 0)
3822                 return status;
3823         do_renew_lease(clp, now);
3824         return 0;
3825 }
3826
3827 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3828 {
3829         return (server->caps & NFS_CAP_ACLS)
3830                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3831                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3832 }
3833
3834 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3835  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3836  * the stack.
3837  */
3838 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3839
3840 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3841                 struct page **pages, unsigned int *pgbase)
3842 {
3843         struct page *newpage, **spages;
3844         int rc = 0;
3845         size_t len;
3846         spages = pages;
3847
3848         do {
3849                 len = min_t(size_t, PAGE_SIZE, buflen);
3850                 newpage = alloc_page(GFP_KERNEL);
3851
3852                 if (newpage == NULL)
3853                         goto unwind;
3854                 memcpy(page_address(newpage), buf, len);
3855                 buf += len;
3856                 buflen -= len;
3857                 *pages++ = newpage;
3858                 rc++;
3859         } while (buflen != 0);
3860
3861         return rc;
3862
3863 unwind:
3864         for(; rc > 0; rc--)
3865                 __free_page(spages[rc-1]);
3866         return -ENOMEM;
3867 }
3868
3869 struct nfs4_cached_acl {
3870         int cached;
3871         size_t len;
3872         char data[0];
3873 };
3874
3875 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3876 {
3877         struct nfs_inode *nfsi = NFS_I(inode);
3878
3879         spin_lock(&inode->i_lock);
3880         kfree(nfsi->nfs4_acl);
3881         nfsi->nfs4_acl = acl;
3882         spin_unlock(&inode->i_lock);
3883 }
3884
3885 static void nfs4_zap_acl_attr(struct inode *inode)
3886 {
3887         nfs4_set_cached_acl(inode, NULL);
3888 }
3889
3890 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3891 {
3892         struct nfs_inode *nfsi = NFS_I(inode);
3893         struct nfs4_cached_acl *acl;
3894         int ret = -ENOENT;
3895
3896         spin_lock(&inode->i_lock);
3897         acl = nfsi->nfs4_acl;
3898         if (acl == NULL)
3899                 goto out;
3900         if (buf == NULL) /* user is just asking for length */
3901                 goto out_len;
3902         if (acl->cached == 0)
3903                 goto out;
3904         ret = -ERANGE; /* see getxattr(2) man page */
3905         if (acl->len > buflen)
3906                 goto out;
3907         memcpy(buf, acl->data, acl->len);
3908 out_len:
3909         ret = acl->len;
3910 out:
3911         spin_unlock(&inode->i_lock);
3912         return ret;
3913 }
3914
3915 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3916 {
3917         struct nfs4_cached_acl *acl;
3918         size_t buflen = sizeof(*acl) + acl_len;
3919
3920         if (buflen <= PAGE_SIZE) {
3921                 acl = kmalloc(buflen, GFP_KERNEL);
3922                 if (acl == NULL)
3923                         goto out;
3924                 acl->cached = 1;
3925                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3926         } else {
3927                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3928                 if (acl == NULL)
3929                         goto out;
3930                 acl->cached = 0;
3931         }
3932         acl->len = acl_len;
3933 out:
3934         nfs4_set_cached_acl(inode, acl);
3935 }
3936
3937 /*
3938  * The getxattr API returns the required buffer length when called with a
3939  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3940  * the required buf.  On a NULL buf, we send a page of data to the server
3941  * guessing that the ACL request can be serviced by a page. If so, we cache
3942  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3943  * the cache. If not so, we throw away the page, and cache the required
3944  * length. The next getxattr call will then produce another round trip to
3945  * the server, this time with the input buf of the required size.
3946  */
3947 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3948 {
3949         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3950         struct nfs_getaclargs args = {
3951                 .fh = NFS_FH(inode),
3952                 .acl_pages = pages,
3953                 .acl_len = buflen,
3954         };
3955         struct nfs_getaclres res = {
3956                 .acl_len = buflen,
3957         };
3958         struct rpc_message msg = {
3959                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3960                 .rpc_argp = &args,
3961                 .rpc_resp = &res,
3962         };
3963         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3964         int ret = -ENOMEM, i;
3965
3966         /* As long as we're doing a round trip to the server anyway,
3967          * let's be prepared for a page of acl data. */
3968         if (npages == 0)
3969                 npages = 1;
3970         if (npages > ARRAY_SIZE(pages))
3971                 return -ERANGE;
3972
3973         for (i = 0; i < npages; i++) {
3974                 pages[i] = alloc_page(GFP_KERNEL);
3975                 if (!pages[i])
3976                         goto out_free;
3977         }
3978
3979         /* for decoding across pages */
3980         res.acl_scratch = alloc_page(GFP_KERNEL);
3981         if (!res.acl_scratch)
3982                 goto out_free;
3983
3984         args.acl_len = npages * PAGE_SIZE;
3985         args.acl_pgbase = 0;
3986
3987         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3988                 __func__, buf, buflen, npages, args.acl_len);
3989         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3990                              &msg, &args.seq_args, &res.seq_res, 0);
3991         if (ret)
3992                 goto out_free;
3993
3994         /* Handle the case where the passed-in buffer is too short */
3995         if (res.acl_flags & NFS4_ACL_TRUNC) {
3996                 /* Did the user only issue a request for the acl length? */
3997                 if (buf == NULL)
3998                         goto out_ok;
3999                 ret = -ERANGE;
4000                 goto out_free;
4001         }
4002         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4003         if (buf) {
4004                 if (res.acl_len > buflen) {
4005                         ret = -ERANGE;
4006                         goto out_free;
4007                 }
4008                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4009         }
4010 out_ok:
4011         ret = res.acl_len;
4012 out_free:
4013         for (i = 0; i < npages; i++)
4014                 if (pages[i])
4015                         __free_page(pages[i]);
4016         if (res.acl_scratch)
4017                 __free_page(res.acl_scratch);
4018         return ret;
4019 }
4020
4021 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4022 {
4023         struct nfs4_exception exception = { };
4024         ssize_t ret;
4025         do {
4026                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4027                 if (ret >= 0)
4028                         break;
4029                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4030         } while (exception.retry);
4031         return ret;
4032 }
4033
4034 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4035 {
4036         struct nfs_server *server = NFS_SERVER(inode);
4037         int ret;
4038
4039         if (!nfs4_server_supports_acls(server))
4040                 return -EOPNOTSUPP;
4041         ret = nfs_revalidate_inode(server, inode);
4042         if (ret < 0)
4043                 return ret;
4044         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4045                 nfs_zap_acl_cache(inode);
4046         ret = nfs4_read_cached_acl(inode, buf, buflen);
4047         if (ret != -ENOENT)
4048                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4049                  * but no cached acl data, just the acl length */
4050                 return ret;
4051         return nfs4_get_acl_uncached(inode, buf, buflen);
4052 }
4053
4054 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4055 {
4056         struct nfs_server *server = NFS_SERVER(inode);
4057         struct page *pages[NFS4ACL_MAXPAGES];
4058         struct nfs_setaclargs arg = {
4059                 .fh             = NFS_FH(inode),
4060                 .acl_pages      = pages,
4061                 .acl_len        = buflen,
4062         };
4063         struct nfs_setaclres res;
4064         struct rpc_message msg = {
4065                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4066                 .rpc_argp       = &arg,
4067                 .rpc_resp       = &res,
4068         };
4069         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4070         int ret, i;
4071
4072         if (!nfs4_server_supports_acls(server))
4073                 return -EOPNOTSUPP;
4074         if (npages > ARRAY_SIZE(pages))
4075                 return -ERANGE;
4076         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4077         if (i < 0)
4078                 return i;
4079         nfs4_inode_return_delegation(inode);
4080         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4081
4082         /*
4083          * Free each page after tx, so the only ref left is
4084          * held by the network stack
4085          */
4086         for (; i > 0; i--)
4087                 put_page(pages[i-1]);
4088
4089         /*
4090          * Acl update can result in inode attribute update.
4091          * so mark the attribute cache invalid.
4092          */
4093         spin_lock(&inode->i_lock);
4094         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4095         spin_unlock(&inode->i_lock);
4096         nfs_access_zap_cache(inode);
4097         nfs_zap_acl_cache(inode);
4098         return ret;
4099 }
4100
4101 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4102 {
4103         struct nfs4_exception exception = { };
4104         int err;
4105         do {
4106                 err = nfs4_handle_exception(NFS_SERVER(inode),
4107                                 __nfs4_proc_set_acl(inode, buf, buflen),
4108                                 &exception);
4109         } while (exception.retry);
4110         return err;
4111 }
4112
4113 static int
4114 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4115 {
4116         struct nfs_client *clp = server->nfs_client;
4117
4118         if (task->tk_status >= 0)
4119                 return 0;
4120         switch(task->tk_status) {
4121                 case -NFS4ERR_DELEG_REVOKED:
4122                 case -NFS4ERR_ADMIN_REVOKED:
4123                 case -NFS4ERR_BAD_STATEID:
4124                         if (state == NULL)
4125                                 break;
4126                         nfs_remove_bad_delegation(state->inode);
4127                 case -NFS4ERR_OPENMODE:
4128                         if (state == NULL)
4129                                 break;
4130                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4131                                 goto stateid_invalid;
4132                         goto wait_on_recovery;
4133                 case -NFS4ERR_EXPIRED:
4134                         if (state != NULL) {
4135                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4136                                         goto stateid_invalid;
4137                         }
4138                 case -NFS4ERR_STALE_STATEID:
4139                 case -NFS4ERR_STALE_CLIENTID:
4140                         nfs4_schedule_lease_recovery(clp);
4141                         goto wait_on_recovery;
4142 #if defined(CONFIG_NFS_V4_1)
4143                 case -NFS4ERR_BADSESSION:
4144                 case -NFS4ERR_BADSLOT:
4145                 case -NFS4ERR_BAD_HIGH_SLOT:
4146                 case -NFS4ERR_DEADSESSION:
4147                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4148                 case -NFS4ERR_SEQ_FALSE_RETRY:
4149                 case -NFS4ERR_SEQ_MISORDERED:
4150                         dprintk("%s ERROR %d, Reset session\n", __func__,
4151                                 task->tk_status);
4152                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4153                         task->tk_status = 0;
4154                         return -EAGAIN;
4155 #endif /* CONFIG_NFS_V4_1 */
4156                 case -NFS4ERR_DELAY:
4157                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4158                 case -NFS4ERR_GRACE:
4159                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4160                         task->tk_status = 0;
4161                         return -EAGAIN;
4162                 case -NFS4ERR_RETRY_UNCACHED_REP:
4163                 case -NFS4ERR_OLD_STATEID:
4164                         task->tk_status = 0;
4165                         return -EAGAIN;
4166         }
4167         task->tk_status = nfs4_map_errors(task->tk_status);
4168         return 0;
4169 stateid_invalid:
4170         task->tk_status = -EIO;
4171         return 0;
4172 wait_on_recovery:
4173         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4174         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4175                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4176         task->tk_status = 0;
4177         return -EAGAIN;
4178 }
4179
4180 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4181                                     nfs4_verifier *bootverf)
4182 {
4183         __be32 verf[2];
4184
4185         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4186                 /* An impossible timestamp guarantees this value
4187                  * will never match a generated boot time. */
4188                 verf[0] = 0;
4189                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4190         } else {
4191                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4192                 verf[0] = (__be32)nn->boot_time.tv_sec;
4193                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4194         }
4195         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4196 }
4197
4198 static unsigned int
4199 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4200                                    char *buf, size_t len)
4201 {
4202         unsigned int result;
4203
4204         rcu_read_lock();
4205         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4206                                 clp->cl_ipaddr,
4207                                 rpc_peeraddr2str(clp->cl_rpcclient,
4208                                                         RPC_DISPLAY_ADDR),
4209                                 rpc_peeraddr2str(clp->cl_rpcclient,
4210                                                         RPC_DISPLAY_PROTO));
4211         rcu_read_unlock();
4212         return result;
4213 }
4214
4215 static unsigned int
4216 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4217                                 char *buf, size_t len)
4218 {
4219         char *nodename = clp->cl_rpcclient->cl_nodename;
4220
4221         if (nfs4_client_id_uniquifier[0] != '\0')
4222                 nodename = nfs4_client_id_uniquifier;
4223         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4224                                 clp->rpc_ops->version, clp->cl_minorversion,
4225                                 nodename);
4226 }
4227
4228 /**
4229  * nfs4_proc_setclientid - Negotiate client ID
4230  * @clp: state data structure
4231  * @program: RPC program for NFSv4 callback service
4232  * @port: IP port number for NFS4 callback service
4233  * @cred: RPC credential to use for this call
4234  * @res: where to place the result
4235  *
4236  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4237  */
4238 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4239                 unsigned short port, struct rpc_cred *cred,
4240                 struct nfs4_setclientid_res *res)
4241 {
4242         nfs4_verifier sc_verifier;
4243         struct nfs4_setclientid setclientid = {
4244                 .sc_verifier = &sc_verifier,
4245                 .sc_prog = program,
4246                 .sc_cb_ident = clp->cl_cb_ident,
4247         };
4248         struct rpc_message msg = {
4249                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4250                 .rpc_argp = &setclientid,
4251                 .rpc_resp = res,
4252                 .rpc_cred = cred,
4253         };
4254         int status;
4255
4256         /* nfs_client_id4 */
4257         nfs4_init_boot_verifier(clp, &sc_verifier);
4258         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4259                 setclientid.sc_name_len =
4260                                 nfs4_init_uniform_client_string(clp,
4261                                                 setclientid.sc_name,
4262                                                 sizeof(setclientid.sc_name));
4263         else
4264                 setclientid.sc_name_len =
4265                                 nfs4_init_nonuniform_client_string(clp,
4266                                                 setclientid.sc_name,
4267                                                 sizeof(setclientid.sc_name));
4268         /* cb_client4 */
4269         rcu_read_lock();
4270         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4271                                 sizeof(setclientid.sc_netid),
4272                                 rpc_peeraddr2str(clp->cl_rpcclient,
4273                                                         RPC_DISPLAY_NETID));
4274         rcu_read_unlock();
4275         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4276                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4277                                 clp->cl_ipaddr, port >> 8, port & 255);
4278
4279         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4280                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4281                 setclientid.sc_name_len, setclientid.sc_name);
4282         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4283         dprintk("NFS reply setclientid: %d\n", status);
4284         return status;
4285 }
4286
4287 /**
4288  * nfs4_proc_setclientid_confirm - Confirm client ID
4289  * @clp: state data structure
4290  * @res: result of a previous SETCLIENTID
4291  * @cred: RPC credential to use for this call
4292  *
4293  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4294  */
4295 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4296                 struct nfs4_setclientid_res *arg,
4297                 struct rpc_cred *cred)
4298 {
4299         struct nfs_fsinfo fsinfo;
4300         struct rpc_message msg = {
4301                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4302                 .rpc_argp = arg,
4303                 .rpc_resp = &fsinfo,
4304                 .rpc_cred = cred,
4305         };
4306         unsigned long now;
4307         int status;
4308
4309         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4310                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4311                 clp->cl_clientid);
4312         now = jiffies;
4313         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4314         if (status == 0) {
4315                 spin_lock(&clp->cl_lock);
4316                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4317                 clp->cl_last_renewal = now;
4318                 spin_unlock(&clp->cl_lock);
4319         }
4320         dprintk("NFS reply setclientid_confirm: %d\n", status);
4321         return status;
4322 }
4323
4324 struct nfs4_delegreturndata {
4325         struct nfs4_delegreturnargs args;
4326         struct nfs4_delegreturnres res;
4327         struct nfs_fh fh;
4328         nfs4_stateid stateid;
4329         unsigned long timestamp;
4330         struct nfs_fattr fattr;
4331         int rpc_status;
4332 };
4333
4334 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4335 {
4336         struct nfs4_delegreturndata *data = calldata;
4337
4338         if (!nfs4_sequence_done(task, &data->res.seq_res))
4339                 return;
4340
4341         switch (task->tk_status) {
4342         case -NFS4ERR_STALE_STATEID:
4343         case -NFS4ERR_EXPIRED:
4344         case 0:
4345                 renew_lease(data->res.server, data->timestamp);
4346                 break;
4347         default:
4348                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4349                                 -EAGAIN) {
4350                         rpc_restart_call_prepare(task);
4351                         return;
4352                 }
4353         }
4354         data->rpc_status = task->tk_status;
4355 }
4356
4357 static void nfs4_delegreturn_release(void *calldata)
4358 {
4359         kfree(calldata);
4360 }
4361
4362 #if defined(CONFIG_NFS_V4_1)
4363 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4364 {
4365         struct nfs4_delegreturndata *d_data;
4366
4367         d_data = (struct nfs4_delegreturndata *)data;
4368
4369         nfs4_setup_sequence(d_data->res.server,
4370                         &d_data->args.seq_args,
4371                         &d_data->res.seq_res,
4372                         task);
4373 }
4374 #endif /* CONFIG_NFS_V4_1 */
4375
4376 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4377 #if defined(CONFIG_NFS_V4_1)
4378         .rpc_call_prepare = nfs4_delegreturn_prepare,
4379 #endif /* CONFIG_NFS_V4_1 */
4380         .rpc_call_done = nfs4_delegreturn_done,
4381         .rpc_release = nfs4_delegreturn_release,
4382 };
4383
4384 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4385 {
4386         struct nfs4_delegreturndata *data;
4387         struct nfs_server *server = NFS_SERVER(inode);
4388         struct rpc_task *task;
4389         struct rpc_message msg = {
4390                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4391                 .rpc_cred = cred,
4392         };
4393         struct rpc_task_setup task_setup_data = {
4394                 .rpc_client = server->client,
4395                 .rpc_message = &msg,
4396                 .callback_ops = &nfs4_delegreturn_ops,
4397                 .flags = RPC_TASK_ASYNC,
4398         };
4399         int status = 0;
4400
4401         data = kzalloc(sizeof(*data), GFP_NOFS);
4402         if (data == NULL)
4403                 return -ENOMEM;
4404         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4405         data->args.fhandle = &data->fh;
4406         data->args.stateid = &data->stateid;
4407         data->args.bitmask = server->cache_consistency_bitmask;
4408         nfs_copy_fh(&data->fh, NFS_FH(inode));
4409         nfs4_stateid_copy(&data->stateid, stateid);
4410         data->res.fattr = &data->fattr;
4411         data->res.server = server;
4412         nfs_fattr_init(data->res.fattr);
4413         data->timestamp = jiffies;
4414         data->rpc_status = 0;
4415
4416         task_setup_data.callback_data = data;
4417         msg.rpc_argp = &data->args;
4418         msg.rpc_resp = &data->res;
4419         task = rpc_run_task(&task_setup_data);
4420         if (IS_ERR(task))
4421                 return PTR_ERR(task);
4422         if (!issync)
4423                 goto out;
4424         status = nfs4_wait_for_completion_rpc_task(task);
4425         if (status != 0)
4426                 goto out;
4427         status = data->rpc_status;
4428         if (status == 0)
4429                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4430         else
4431                 nfs_refresh_inode(inode, &data->fattr);
4432 out:
4433         rpc_put_task(task);
4434         return status;
4435 }
4436
4437 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4438 {
4439         struct nfs_server *server = NFS_SERVER(inode);
4440         struct nfs4_exception exception = { };
4441         int err;
4442         do {
4443                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4444                 switch (err) {
4445                         case -NFS4ERR_STALE_STATEID:
4446                         case -NFS4ERR_EXPIRED:
4447                         case 0:
4448                                 return 0;
4449                 }
4450                 err = nfs4_handle_exception(server, err, &exception);
4451         } while (exception.retry);
4452         return err;
4453 }
4454
4455 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4456 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4457
4458 /*
4459  * sleep, with exponential backoff, and retry the LOCK operation.
4460  */
4461 static unsigned long
4462 nfs4_set_lock_task_retry(unsigned long timeout)
4463 {
4464         freezable_schedule_timeout_killable(timeout);
4465         timeout <<= 1;
4466         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4467                 return NFS4_LOCK_MAXTIMEOUT;
4468         return timeout;
4469 }
4470
4471 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4472 {
4473         struct inode *inode = state->inode;
4474         struct nfs_server *server = NFS_SERVER(inode);
4475         struct nfs_client *clp = server->nfs_client;
4476         struct nfs_lockt_args arg = {
4477                 .fh = NFS_FH(inode),
4478                 .fl = request,
4479         };
4480         struct nfs_lockt_res res = {
4481                 .denied = request,
4482         };
4483         struct rpc_message msg = {
4484                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4485                 .rpc_argp       = &arg,
4486                 .rpc_resp       = &res,
4487                 .rpc_cred       = state->owner->so_cred,
4488         };
4489         struct nfs4_lock_state *lsp;
4490         int status;
4491
4492         arg.lock_owner.clientid = clp->cl_clientid;
4493         status = nfs4_set_lock_state(state, request);
4494         if (status != 0)
4495                 goto out;
4496         lsp = request->fl_u.nfs4_fl.owner;
4497         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4498         arg.lock_owner.s_dev = server->s_dev;
4499         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4500         switch (status) {
4501                 case 0:
4502                         request->fl_type = F_UNLCK;
4503                         break;
4504                 case -NFS4ERR_DENIED:
4505                         status = 0;
4506         }
4507         request->fl_ops->fl_release_private(request);
4508 out:
4509         return status;
4510 }
4511
4512 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4513 {
4514         struct nfs4_exception exception = { };
4515         int err;
4516
4517         do {
4518                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4519                                 _nfs4_proc_getlk(state, cmd, request),
4520                                 &exception);
4521         } while (exception.retry);
4522         return err;
4523 }
4524
4525 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4526 {
4527         int res = 0;
4528         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4529                 case FL_POSIX:
4530                         res = posix_lock_file_wait(file, fl);
4531                         break;
4532                 case FL_FLOCK:
4533                         res = flock_lock_file_wait(file, fl);
4534                         break;
4535                 default:
4536                         BUG();
4537         }
4538         return res;
4539 }
4540
4541 struct nfs4_unlockdata {
4542         struct nfs_locku_args arg;
4543         struct nfs_locku_res res;
4544         struct nfs4_lock_state *lsp;
4545         struct nfs_open_context *ctx;
4546         struct file_lock fl;
4547         const struct nfs_server *server;
4548         unsigned long timestamp;
4549 };
4550
4551 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4552                 struct nfs_open_context *ctx,
4553                 struct nfs4_lock_state *lsp,
4554                 struct nfs_seqid *seqid)
4555 {
4556         struct nfs4_unlockdata *p;
4557         struct inode *inode = lsp->ls_state->inode;
4558
4559         p = kzalloc(sizeof(*p), GFP_NOFS);
4560         if (p == NULL)
4561                 return NULL;
4562         p->arg.fh = NFS_FH(inode);
4563         p->arg.fl = &p->fl;
4564         p->arg.seqid = seqid;
4565         p->res.seqid = seqid;
4566         p->arg.stateid = &lsp->ls_stateid;
4567         p->lsp = lsp;
4568         atomic_inc(&lsp->ls_count);
4569         /* Ensure we don't close file until we're done freeing locks! */
4570         p->ctx = get_nfs_open_context(ctx);
4571         memcpy(&p->fl, fl, sizeof(p->fl));
4572         p->server = NFS_SERVER(inode);
4573         return p;
4574 }
4575
4576 static void nfs4_locku_release_calldata(void *data)
4577 {
4578         struct nfs4_unlockdata *calldata = data;
4579         nfs_free_seqid(calldata->arg.seqid);
4580         nfs4_put_lock_state(calldata->lsp);
4581         put_nfs_open_context(calldata->ctx);
4582         kfree(calldata);
4583 }
4584
4585 static void nfs4_locku_done(struct rpc_task *task, void *data)
4586 {
4587         struct nfs4_unlockdata *calldata = data;
4588
4589         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4590                 return;
4591         switch (task->tk_status) {
4592                 case 0:
4593                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4594                                         &calldata->res.stateid);
4595                         renew_lease(calldata->server, calldata->timestamp);
4596                         break;
4597                 case -NFS4ERR_BAD_STATEID:
4598                 case -NFS4ERR_OLD_STATEID:
4599                 case -NFS4ERR_STALE_STATEID:
4600                 case -NFS4ERR_EXPIRED:
4601                         break;
4602                 default:
4603                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4604                                 rpc_restart_call_prepare(task);
4605         }
4606         nfs_release_seqid(calldata->arg.seqid);
4607 }
4608
4609 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4610 {
4611         struct nfs4_unlockdata *calldata = data;
4612
4613         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4614                 goto out_wait;
4615         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4616                 /* Note: exit _without_ running nfs4_locku_done */
4617                 goto out_no_action;
4618         }
4619         calldata->timestamp = jiffies;
4620         if (nfs4_setup_sequence(calldata->server,
4621                                 &calldata->arg.seq_args,
4622                                 &calldata->res.seq_res,
4623                                 task) != 0)
4624                 nfs_release_seqid(calldata->arg.seqid);
4625         return;
4626 out_no_action:
4627         task->tk_action = NULL;
4628 out_wait:
4629         nfs4_sequence_done(task, &calldata->res.seq_res);
4630 }
4631
4632 static const struct rpc_call_ops nfs4_locku_ops = {
4633         .rpc_call_prepare = nfs4_locku_prepare,
4634         .rpc_call_done = nfs4_locku_done,
4635         .rpc_release = nfs4_locku_release_calldata,
4636 };
4637
4638 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4639                 struct nfs_open_context *ctx,
4640                 struct nfs4_lock_state *lsp,
4641                 struct nfs_seqid *seqid)
4642 {
4643         struct nfs4_unlockdata *data;
4644         struct rpc_message msg = {
4645                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4646                 .rpc_cred = ctx->cred,
4647         };
4648         struct rpc_task_setup task_setup_data = {
4649                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4650                 .rpc_message = &msg,
4651                 .callback_ops = &nfs4_locku_ops,
4652                 .workqueue = nfsiod_workqueue,
4653                 .flags = RPC_TASK_ASYNC,
4654         };
4655
4656         /* Ensure this is an unlock - when canceling a lock, the
4657          * canceled lock is passed in, and it won't be an unlock.
4658          */
4659         fl->fl_type = F_UNLCK;
4660
4661         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4662         if (data == NULL) {
4663                 nfs_free_seqid(seqid);
4664                 return ERR_PTR(-ENOMEM);
4665         }
4666
4667         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4668         msg.rpc_argp = &data->arg;
4669         msg.rpc_resp = &data->res;
4670         task_setup_data.callback_data = data;
4671         return rpc_run_task(&task_setup_data);
4672 }
4673
4674 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4675 {
4676         struct inode *inode = state->inode;
4677         struct nfs4_state_owner *sp = state->owner;
4678         struct nfs_inode *nfsi = NFS_I(inode);
4679         struct nfs_seqid *seqid;
4680         struct nfs4_lock_state *lsp;
4681         struct rpc_task *task;
4682         int status = 0;
4683         unsigned char fl_flags = request->fl_flags;
4684
4685         status = nfs4_set_lock_state(state, request);
4686         /* Unlock _before_ we do the RPC call */
4687         request->fl_flags |= FL_EXISTS;
4688         /* Exclude nfs_delegation_claim_locks() */
4689         mutex_lock(&sp->so_delegreturn_mutex);
4690         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4691         down_read(&nfsi->rwsem);
4692         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4693                 up_read(&nfsi->rwsem);
4694                 mutex_unlock(&sp->so_delegreturn_mutex);
4695                 goto out;
4696         }
4697         up_read(&nfsi->rwsem);
4698         mutex_unlock(&sp->so_delegreturn_mutex);
4699         if (status != 0)
4700                 goto out;
4701         /* Is this a delegated lock? */
4702         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4703                 goto out;
4704         lsp = request->fl_u.nfs4_fl.owner;
4705         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4706         status = -ENOMEM;
4707         if (seqid == NULL)
4708                 goto out;
4709         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4710         status = PTR_ERR(task);
4711         if (IS_ERR(task))
4712                 goto out;
4713         status = nfs4_wait_for_completion_rpc_task(task);
4714         rpc_put_task(task);
4715 out:
4716         request->fl_flags = fl_flags;
4717         return status;
4718 }
4719
4720 struct nfs4_lockdata {
4721         struct nfs_lock_args arg;
4722         struct nfs_lock_res res;
4723         struct nfs4_lock_state *lsp;
4724         struct nfs_open_context *ctx;
4725         struct file_lock fl;
4726         unsigned long timestamp;
4727         int rpc_status;
4728         int cancelled;
4729         struct nfs_server *server;
4730 };
4731
4732 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4733                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4734                 gfp_t gfp_mask)
4735 {
4736         struct nfs4_lockdata *p;
4737         struct inode *inode = lsp->ls_state->inode;
4738         struct nfs_server *server = NFS_SERVER(inode);
4739
4740         p = kzalloc(sizeof(*p), gfp_mask);
4741         if (p == NULL)
4742                 return NULL;
4743
4744         p->arg.fh = NFS_FH(inode);
4745         p->arg.fl = &p->fl;
4746         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4747         if (p->arg.open_seqid == NULL)
4748                 goto out_free;
4749         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4750         if (p->arg.lock_seqid == NULL)
4751                 goto out_free_seqid;
4752         p->arg.lock_stateid = &lsp->ls_stateid;
4753         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4754         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4755         p->arg.lock_owner.s_dev = server->s_dev;
4756         p->res.lock_seqid = p->arg.lock_seqid;
4757         p->lsp = lsp;
4758         p->server = server;
4759         atomic_inc(&lsp->ls_count);
4760         p->ctx = get_nfs_open_context(ctx);
4761         memcpy(&p->fl, fl, sizeof(p->fl));
4762         return p;
4763 out_free_seqid:
4764         nfs_free_seqid(p->arg.open_seqid);
4765 out_free:
4766         kfree(p);
4767         return NULL;
4768 }
4769
4770 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4771 {
4772         struct nfs4_lockdata *data = calldata;
4773         struct nfs4_state *state = data->lsp->ls_state;
4774
4775         dprintk("%s: begin!\n", __func__);
4776         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4777                 goto out_wait;
4778         /* Do we need to do an open_to_lock_owner? */
4779         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4780                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4781                         goto out_release_lock_seqid;
4782                 }
4783                 data->arg.open_stateid = &state->stateid;
4784                 data->arg.new_lock_owner = 1;
4785                 data->res.open_seqid = data->arg.open_seqid;
4786         } else
4787                 data->arg.new_lock_owner = 0;
4788         if (!nfs4_valid_open_stateid(state)) {
4789                 data->rpc_status = -EBADF;
4790                 task->tk_action = NULL;
4791                 goto out_release_open_seqid;
4792         }
4793         data->timestamp = jiffies;
4794         if (nfs4_setup_sequence(data->server,
4795                                 &data->arg.seq_args,
4796                                 &data->res.seq_res,
4797                                 task) == 0)
4798                 return;
4799 out_release_open_seqid:
4800         nfs_release_seqid(data->arg.open_seqid);
4801 out_release_lock_seqid:
4802         nfs_release_seqid(data->arg.lock_seqid);
4803 out_wait:
4804         nfs4_sequence_done(task, &data->res.seq_res);
4805         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4806 }
4807
4808 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4809 {
4810         struct nfs4_lockdata *data = calldata;
4811
4812         dprintk("%s: begin!\n", __func__);
4813
4814         if (!nfs4_sequence_done(task, &data->res.seq_res))
4815                 return;
4816
4817         data->rpc_status = task->tk_status;
4818         if (data->arg.new_lock_owner != 0) {
4819                 if (data->rpc_status == 0)
4820                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4821                 else
4822                         goto out;
4823         }
4824         if (data->rpc_status == 0) {
4825                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4826                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4827                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4828         }
4829 out:
4830         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4831 }
4832
4833 static void nfs4_lock_release(void *calldata)
4834 {
4835         struct nfs4_lockdata *data = calldata;
4836
4837         dprintk("%s: begin!\n", __func__);
4838         nfs_free_seqid(data->arg.open_seqid);
4839         if (data->cancelled != 0) {
4840                 struct rpc_task *task;
4841                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4842                                 data->arg.lock_seqid);
4843                 if (!IS_ERR(task))
4844                         rpc_put_task_async(task);
4845                 dprintk("%s: cancelling lock!\n", __func__);
4846         } else
4847                 nfs_free_seqid(data->arg.lock_seqid);
4848         nfs4_put_lock_state(data->lsp);
4849         put_nfs_open_context(data->ctx);
4850         kfree(data);
4851         dprintk("%s: done!\n", __func__);
4852 }
4853
4854 static const struct rpc_call_ops nfs4_lock_ops = {
4855         .rpc_call_prepare = nfs4_lock_prepare,
4856         .rpc_call_done = nfs4_lock_done,
4857         .rpc_release = nfs4_lock_release,
4858 };
4859
4860 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4861 {
4862         switch (error) {
4863         case -NFS4ERR_ADMIN_REVOKED:
4864         case -NFS4ERR_BAD_STATEID:
4865                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4866                 if (new_lock_owner != 0 ||
4867                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4868                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4869                 break;
4870         case -NFS4ERR_STALE_STATEID:
4871                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4872         case -NFS4ERR_EXPIRED:
4873                 nfs4_schedule_lease_recovery(server->nfs_client);
4874         };
4875 }
4876
4877 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4878 {
4879         struct nfs4_lockdata *data;
4880         struct rpc_task *task;
4881         struct rpc_message msg = {
4882                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4883                 .rpc_cred = state->owner->so_cred,
4884         };
4885         struct rpc_task_setup task_setup_data = {
4886                 .rpc_client = NFS_CLIENT(state->inode),
4887                 .rpc_message = &msg,
4888                 .callback_ops = &nfs4_lock_ops,
4889                 .workqueue = nfsiod_workqueue,
4890                 .flags = RPC_TASK_ASYNC,
4891         };
4892         int ret;
4893
4894         dprintk("%s: begin!\n", __func__);
4895         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4896                         fl->fl_u.nfs4_fl.owner,
4897                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4898         if (data == NULL)
4899                 return -ENOMEM;
4900         if (IS_SETLKW(cmd))
4901                 data->arg.block = 1;
4902         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4903         msg.rpc_argp = &data->arg;
4904         msg.rpc_resp = &data->res;
4905         task_setup_data.callback_data = data;
4906         if (recovery_type > NFS_LOCK_NEW) {
4907                 if (recovery_type == NFS_LOCK_RECLAIM)
4908                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4909                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4910         }
4911         task = rpc_run_task(&task_setup_data);
4912         if (IS_ERR(task))
4913                 return PTR_ERR(task);
4914         ret = nfs4_wait_for_completion_rpc_task(task);
4915         if (ret == 0) {
4916                 ret = data->rpc_status;
4917                 if (ret)
4918                         nfs4_handle_setlk_error(data->server, data->lsp,
4919                                         data->arg.new_lock_owner, ret);
4920         } else
4921                 data->cancelled = 1;
4922         rpc_put_task(task);
4923         dprintk("%s: done, ret = %d!\n", __func__, ret);
4924         return ret;
4925 }
4926
4927 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4928 {
4929         struct nfs_server *server = NFS_SERVER(state->inode);
4930         struct nfs4_exception exception = {
4931                 .inode = state->inode,
4932         };
4933         int err;
4934
4935         do {
4936                 /* Cache the lock if possible... */
4937                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4938                         return 0;
4939                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4940                 if (err != -NFS4ERR_DELAY)
4941                         break;
4942                 nfs4_handle_exception(server, err, &exception);
4943         } while (exception.retry);
4944         return err;
4945 }
4946
4947 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4948 {
4949         struct nfs_server *server = NFS_SERVER(state->inode);
4950         struct nfs4_exception exception = {
4951                 .inode = state->inode,
4952         };
4953         int err;
4954
4955         err = nfs4_set_lock_state(state, request);
4956         if (err != 0)
4957                 return err;
4958         do {
4959                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4960                         return 0;
4961                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4962                 switch (err) {
4963                 default:
4964                         goto out;
4965                 case -NFS4ERR_GRACE:
4966                 case -NFS4ERR_DELAY:
4967                         nfs4_handle_exception(server, err, &exception);
4968                         err = 0;
4969                 }
4970         } while (exception.retry);
4971 out:
4972         return err;
4973 }
4974
4975 #if defined(CONFIG_NFS_V4_1)
4976 /**
4977  * nfs41_check_expired_locks - possibly free a lock stateid
4978  *
4979  * @state: NFSv4 state for an inode
4980  *
4981  * Returns NFS_OK if recovery for this stateid is now finished.
4982  * Otherwise a negative NFS4ERR value is returned.
4983  */
4984 static int nfs41_check_expired_locks(struct nfs4_state *state)
4985 {
4986         int status, ret = -NFS4ERR_BAD_STATEID;
4987         struct nfs4_lock_state *lsp;
4988         struct nfs_server *server = NFS_SERVER(state->inode);
4989
4990         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4991                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4992                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4993                         if (status != NFS_OK) {
4994                                 /* Free the stateid unless the server
4995                                  * informs us the stateid is unrecognized. */
4996                                 if (status != -NFS4ERR_BAD_STATEID)
4997                                         nfs41_free_stateid(server,
4998                                                         &lsp->ls_stateid);
4999                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5000                                 ret = status;
5001                         }
5002                 }
5003         };
5004
5005         return ret;
5006 }
5007
5008 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5009 {
5010         int status = NFS_OK;
5011
5012         if (test_bit(LK_STATE_IN_USE, &state->flags))
5013                 status = nfs41_check_expired_locks(state);
5014         if (status != NFS_OK)
5015                 status = nfs4_lock_expired(state, request);
5016         return status;
5017 }
5018 #endif
5019
5020 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5021 {
5022         struct nfs4_state_owner *sp = state->owner;
5023         struct nfs_inode *nfsi = NFS_I(state->inode);
5024         unsigned char fl_flags = request->fl_flags;
5025         unsigned int seq;
5026         int status = -ENOLCK;
5027
5028         if ((fl_flags & FL_POSIX) &&
5029                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5030                 goto out;
5031         /* Is this a delegated open? */
5032         status = nfs4_set_lock_state(state, request);
5033         if (status != 0)
5034                 goto out;
5035         request->fl_flags |= FL_ACCESS;
5036         status = do_vfs_lock(request->fl_file, request);
5037         if (status < 0)
5038                 goto out;
5039         down_read(&nfsi->rwsem);
5040         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5041                 /* Yes: cache locks! */
5042                 /* ...but avoid races with delegation recall... */
5043                 request->fl_flags = fl_flags & ~FL_SLEEP;
5044                 status = do_vfs_lock(request->fl_file, request);
5045                 goto out_unlock;
5046         }
5047         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5048         up_read(&nfsi->rwsem);
5049         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5050         if (status != 0)
5051                 goto out;
5052         down_read(&nfsi->rwsem);
5053         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5054                 status = -NFS4ERR_DELAY;
5055                 goto out_unlock;
5056         }
5057         /* Note: we always want to sleep here! */
5058         request->fl_flags = fl_flags | FL_SLEEP;
5059         if (do_vfs_lock(request->fl_file, request) < 0)
5060                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5061                         "manager!\n", __func__);
5062 out_unlock:
5063         up_read(&nfsi->rwsem);
5064 out:
5065         request->fl_flags = fl_flags;
5066         return status;
5067 }
5068
5069 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5070 {
5071         struct nfs4_exception exception = {
5072                 .state = state,
5073                 .inode = state->inode,
5074         };
5075         int err;
5076
5077         do {
5078                 err = _nfs4_proc_setlk(state, cmd, request);
5079                 if (err == -NFS4ERR_DENIED)
5080                         err = -EAGAIN;
5081                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5082                                 err, &exception);
5083         } while (exception.retry);
5084         return err;
5085 }
5086
5087 static int
5088 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5089 {
5090         struct nfs_open_context *ctx;
5091         struct nfs4_state *state;
5092         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5093         int status;
5094
5095         /* verify open state */
5096         ctx = nfs_file_open_context(filp);
5097         state = ctx->state;
5098
5099         if (request->fl_start < 0 || request->fl_end < 0)
5100                 return -EINVAL;
5101
5102         if (IS_GETLK(cmd)) {
5103                 if (state != NULL)
5104                         return nfs4_proc_getlk(state, F_GETLK, request);
5105                 return 0;
5106         }
5107
5108         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5109                 return -EINVAL;
5110
5111         if (request->fl_type == F_UNLCK) {
5112                 if (state != NULL)
5113                         return nfs4_proc_unlck(state, cmd, request);
5114                 return 0;
5115         }
5116
5117         if (state == NULL)
5118                 return -ENOLCK;
5119         /*
5120          * Don't rely on the VFS having checked the file open mode,
5121          * since it won't do this for flock() locks.
5122          */
5123         switch (request->fl_type) {
5124         case F_RDLCK:
5125                 if (!(filp->f_mode & FMODE_READ))
5126                         return -EBADF;
5127                 break;
5128         case F_WRLCK:
5129                 if (!(filp->f_mode & FMODE_WRITE))
5130                         return -EBADF;
5131         }
5132
5133         do {
5134                 status = nfs4_proc_setlk(state, cmd, request);
5135                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5136                         break;
5137                 timeout = nfs4_set_lock_task_retry(timeout);
5138                 status = -ERESTARTSYS;
5139                 if (signalled())
5140                         break;
5141         } while(status < 0);
5142         return status;
5143 }
5144
5145 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5146 {
5147         struct nfs_server *server = NFS_SERVER(state->inode);
5148         int err;
5149
5150         err = nfs4_set_lock_state(state, fl);
5151         if (err != 0)
5152                 return err;
5153         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5154         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5155 }
5156
5157 struct nfs_release_lockowner_data {
5158         struct nfs4_lock_state *lsp;
5159         struct nfs_server *server;
5160         struct nfs_release_lockowner_args args;
5161 };
5162
5163 static void nfs4_release_lockowner_release(void *calldata)
5164 {
5165         struct nfs_release_lockowner_data *data = calldata;
5166         nfs4_free_lock_state(data->server, data->lsp);
5167         kfree(calldata);
5168 }
5169
5170 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5171         .rpc_release = nfs4_release_lockowner_release,
5172 };
5173
5174 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5175 {
5176         struct nfs_server *server = lsp->ls_state->owner->so_server;
5177         struct nfs_release_lockowner_data *data;
5178         struct rpc_message msg = {
5179                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5180         };
5181
5182         if (server->nfs_client->cl_mvops->minor_version != 0)
5183                 return -EINVAL;
5184         data = kmalloc(sizeof(*data), GFP_NOFS);
5185         if (!data)
5186                 return -ENOMEM;
5187         data->lsp = lsp;
5188         data->server = server;
5189         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5190         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5191         data->args.lock_owner.s_dev = server->s_dev;
5192         msg.rpc_argp = &data->args;
5193         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5194         return 0;
5195 }
5196
5197 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5198
5199 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5200                                    const void *buf, size_t buflen,
5201                                    int flags, int type)
5202 {
5203         if (strcmp(key, "") != 0)
5204                 return -EINVAL;
5205
5206         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5207 }
5208
5209 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5210                                    void *buf, size_t buflen, int type)
5211 {
5212         if (strcmp(key, "") != 0)
5213                 return -EINVAL;
5214
5215         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5216 }
5217
5218 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5219                                        size_t list_len, const char *name,
5220                                        size_t name_len, int type)
5221 {
5222         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5223
5224         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5225                 return 0;
5226
5227         if (list && len <= list_len)
5228                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5229         return len;
5230 }
5231
5232 /*
5233  * nfs_fhget will use either the mounted_on_fileid or the fileid
5234  */
5235 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5236 {
5237         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5238                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5239               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5240               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5241                 return;
5242
5243         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5244                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5245         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5246         fattr->nlink = 2;
5247 }
5248
5249 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5250                                    const struct qstr *name,
5251                                    struct nfs4_fs_locations *fs_locations,
5252                                    struct page *page)
5253 {
5254         struct nfs_server *server = NFS_SERVER(dir);
5255         u32 bitmask[2] = {
5256                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5257         };
5258         struct nfs4_fs_locations_arg args = {
5259                 .dir_fh = NFS_FH(dir),
5260                 .name = name,
5261                 .page = page,
5262                 .bitmask = bitmask,
5263         };
5264         struct nfs4_fs_locations_res res = {
5265                 .fs_locations = fs_locations,
5266         };
5267         struct rpc_message msg = {
5268                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5269                 .rpc_argp = &args,
5270                 .rpc_resp = &res,
5271         };
5272         int status;
5273
5274         dprintk("%s: start\n", __func__);
5275
5276         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5277          * is not supported */
5278         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5279                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5280         else
5281                 bitmask[0] |= FATTR4_WORD0_FILEID;
5282
5283         nfs_fattr_init(&fs_locations->fattr);
5284         fs_locations->server = server;
5285         fs_locations->nlocations = 0;
5286         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5287         dprintk("%s: returned status = %d\n", __func__, status);
5288         return status;
5289 }
5290
5291 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5292                            const struct qstr *name,
5293                            struct nfs4_fs_locations *fs_locations,
5294                            struct page *page)
5295 {
5296         struct nfs4_exception exception = { };
5297         int err;
5298         do {
5299                 err = nfs4_handle_exception(NFS_SERVER(dir),
5300                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5301                                 &exception);
5302         } while (exception.retry);
5303         return err;
5304 }
5305
5306 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5307 {
5308         int status;
5309         struct nfs4_secinfo_arg args = {
5310                 .dir_fh = NFS_FH(dir),
5311                 .name   = name,
5312         };
5313         struct nfs4_secinfo_res res = {
5314                 .flavors     = flavors,
5315         };
5316         struct rpc_message msg = {
5317                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5318                 .rpc_argp = &args,
5319                 .rpc_resp = &res,
5320         };
5321
5322         dprintk("NFS call  secinfo %s\n", name->name);
5323         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5324         dprintk("NFS reply  secinfo: %d\n", status);
5325         return status;
5326 }
5327
5328 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5329                       struct nfs4_secinfo_flavors *flavors)
5330 {
5331         struct nfs4_exception exception = { };
5332         int err;
5333         do {
5334                 err = nfs4_handle_exception(NFS_SERVER(dir),
5335                                 _nfs4_proc_secinfo(dir, name, flavors),
5336                                 &exception);
5337         } while (exception.retry);
5338         return err;
5339 }
5340
5341 #ifdef CONFIG_NFS_V4_1
5342 /*
5343  * Check the exchange flags returned by the server for invalid flags, having
5344  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5345  * DS flags set.
5346  */
5347 static int nfs4_check_cl_exchange_flags(u32 flags)
5348 {
5349         if (flags & ~EXCHGID4_FLAG_MASK_R)
5350                 goto out_inval;
5351         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5352             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5353                 goto out_inval;
5354         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5355                 goto out_inval;
5356         return NFS_OK;
5357 out_inval:
5358         return -NFS4ERR_INVAL;
5359 }
5360
5361 static bool
5362 nfs41_same_server_scope(struct nfs41_server_scope *a,
5363                         struct nfs41_server_scope *b)
5364 {
5365         if (a->server_scope_sz == b->server_scope_sz &&
5366             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5367                 return true;
5368
5369         return false;
5370 }
5371
5372 /*
5373  * nfs4_proc_bind_conn_to_session()
5374  *
5375  * The 4.1 client currently uses the same TCP connection for the
5376  * fore and backchannel.
5377  */
5378 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5379 {
5380         int status;
5381         struct nfs41_bind_conn_to_session_res res;
5382         struct rpc_message msg = {
5383                 .rpc_proc =
5384                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5385                 .rpc_argp = clp,
5386                 .rpc_resp = &res,
5387                 .rpc_cred = cred,
5388         };
5389
5390         dprintk("--> %s\n", __func__);
5391
5392         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5393         if (unlikely(res.session == NULL)) {
5394                 status = -ENOMEM;
5395                 goto out;
5396         }
5397
5398         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5399         if (status == 0) {
5400                 if (memcmp(res.session->sess_id.data,
5401                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5402                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5403                         status = -EIO;
5404                         goto out_session;
5405                 }
5406                 if (res.dir != NFS4_CDFS4_BOTH) {
5407                         dprintk("NFS: %s: Unexpected direction from server\n",
5408                                 __func__);
5409                         status = -EIO;
5410                         goto out_session;
5411                 }
5412                 if (res.use_conn_in_rdma_mode) {
5413                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5414                                 __func__);
5415                         status = -EIO;
5416                         goto out_session;
5417                 }
5418         }
5419 out_session:
5420         kfree(res.session);
5421 out:
5422         dprintk("<-- %s status= %d\n", __func__, status);
5423         return status;
5424 }
5425
5426 /*
5427  * nfs4_proc_exchange_id()
5428  *
5429  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5430  *
5431  * Since the clientid has expired, all compounds using sessions
5432  * associated with the stale clientid will be returning
5433  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5434  * be in some phase of session reset.
5435  */
5436 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5437 {
5438         nfs4_verifier verifier;
5439         struct nfs41_exchange_id_args args = {
5440                 .verifier = &verifier,
5441                 .client = clp,
5442                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5443         };
5444         struct nfs41_exchange_id_res res = {
5445                 0
5446         };
5447         int status;
5448         struct rpc_message msg = {
5449                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5450                 .rpc_argp = &args,
5451                 .rpc_resp = &res,
5452                 .rpc_cred = cred,
5453         };
5454
5455         nfs4_init_boot_verifier(clp, &verifier);
5456         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5457                                                         sizeof(args.id));
5458         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5459                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5460                 args.id_len, args.id);
5461
5462         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5463                                         GFP_NOFS);
5464         if (unlikely(res.server_owner == NULL)) {
5465                 status = -ENOMEM;
5466                 goto out;
5467         }
5468
5469         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5470                                         GFP_NOFS);
5471         if (unlikely(res.server_scope == NULL)) {
5472                 status = -ENOMEM;
5473                 goto out_server_owner;
5474         }
5475
5476         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5477         if (unlikely(res.impl_id == NULL)) {
5478                 status = -ENOMEM;
5479                 goto out_server_scope;
5480         }
5481
5482         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5483         if (status == 0)
5484                 status = nfs4_check_cl_exchange_flags(res.flags);
5485
5486         if (status == 0) {
5487                 clp->cl_clientid = res.clientid;
5488                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5489                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5490                         clp->cl_seqid = res.seqid;
5491
5492                 kfree(clp->cl_serverowner);
5493                 clp->cl_serverowner = res.server_owner;
5494                 res.server_owner = NULL;
5495
5496                 /* use the most recent implementation id */
5497                 kfree(clp->cl_implid);
5498                 clp->cl_implid = res.impl_id;
5499
5500                 if (clp->cl_serverscope != NULL &&
5501                     !nfs41_same_server_scope(clp->cl_serverscope,
5502                                              res.server_scope)) {
5503                         dprintk("%s: server_scope mismatch detected\n",
5504                                 __func__);
5505                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5506                         kfree(clp->cl_serverscope);
5507                         clp->cl_serverscope = NULL;
5508                 }
5509
5510                 if (clp->cl_serverscope == NULL) {
5511                         clp->cl_serverscope = res.server_scope;
5512                         goto out;
5513                 }
5514         } else
5515                 kfree(res.impl_id);
5516
5517 out_server_owner:
5518         kfree(res.server_owner);
5519 out_server_scope:
5520         kfree(res.server_scope);
5521 out:
5522         if (clp->cl_implid != NULL)
5523                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5524                         "domain: %s, name: %s, date: %llu,%u\n",
5525                         clp->cl_implid->domain, clp->cl_implid->name,
5526                         clp->cl_implid->date.seconds,
5527                         clp->cl_implid->date.nseconds);
5528         dprintk("NFS reply exchange_id: %d\n", status);
5529         return status;
5530 }
5531
5532 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5533                 struct rpc_cred *cred)
5534 {
5535         struct rpc_message msg = {
5536                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5537                 .rpc_argp = clp,
5538                 .rpc_cred = cred,
5539         };
5540         int status;
5541
5542         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5543         if (status)
5544                 dprintk("NFS: Got error %d from the server %s on "
5545                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5546         return status;
5547 }
5548
5549 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5550                 struct rpc_cred *cred)
5551 {
5552         unsigned int loop;
5553         int ret;
5554
5555         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5556                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5557                 switch (ret) {
5558                 case -NFS4ERR_DELAY:
5559                 case -NFS4ERR_CLIENTID_BUSY:
5560                         ssleep(1);
5561                         break;
5562                 default:
5563                         return ret;
5564                 }
5565         }
5566         return 0;
5567 }
5568
5569 int nfs4_destroy_clientid(struct nfs_client *clp)
5570 {
5571         struct rpc_cred *cred;
5572         int ret = 0;
5573
5574         if (clp->cl_mvops->minor_version < 1)
5575                 goto out;
5576         if (clp->cl_exchange_flags == 0)
5577                 goto out;
5578         if (clp->cl_preserve_clid)
5579                 goto out;
5580         cred = nfs4_get_exchange_id_cred(clp);
5581         ret = nfs4_proc_destroy_clientid(clp, cred);
5582         if (cred)
5583                 put_rpccred(cred);
5584         switch (ret) {
5585         case 0:
5586         case -NFS4ERR_STALE_CLIENTID:
5587                 clp->cl_exchange_flags = 0;
5588         }
5589 out:
5590         return ret;
5591 }
5592
5593 struct nfs4_get_lease_time_data {
5594         struct nfs4_get_lease_time_args *args;
5595         struct nfs4_get_lease_time_res *res;
5596         struct nfs_client *clp;
5597 };
5598
5599 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5600                                         void *calldata)
5601 {
5602         struct nfs4_get_lease_time_data *data =
5603                         (struct nfs4_get_lease_time_data *)calldata;
5604
5605         dprintk("--> %s\n", __func__);
5606         /* just setup sequence, do not trigger session recovery
5607            since we're invoked within one */
5608         nfs41_setup_sequence(data->clp->cl_session,
5609                         &data->args->la_seq_args,
5610                         &data->res->lr_seq_res,
5611                         task);
5612         dprintk("<-- %s\n", __func__);
5613 }
5614
5615 /*
5616  * Called from nfs4_state_manager thread for session setup, so don't recover
5617  * from sequence operation or clientid errors.
5618  */
5619 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5620 {
5621         struct nfs4_get_lease_time_data *data =
5622                         (struct nfs4_get_lease_time_data *)calldata;
5623
5624         dprintk("--> %s\n", __func__);
5625         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5626                 return;
5627         switch (task->tk_status) {
5628         case -NFS4ERR_DELAY:
5629         case -NFS4ERR_GRACE:
5630                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5631                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5632                 task->tk_status = 0;
5633                 /* fall through */
5634         case -NFS4ERR_RETRY_UNCACHED_REP:
5635                 rpc_restart_call_prepare(task);
5636                 return;
5637         }
5638         dprintk("<-- %s\n", __func__);
5639 }
5640
5641 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5642         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5643         .rpc_call_done = nfs4_get_lease_time_done,
5644 };
5645
5646 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5647 {
5648         struct rpc_task *task;
5649         struct nfs4_get_lease_time_args args;
5650         struct nfs4_get_lease_time_res res = {
5651                 .lr_fsinfo = fsinfo,
5652         };
5653         struct nfs4_get_lease_time_data data = {
5654                 .args = &args,
5655                 .res = &res,
5656                 .clp = clp,
5657         };
5658         struct rpc_message msg = {
5659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5660                 .rpc_argp = &args,
5661                 .rpc_resp = &res,
5662         };
5663         struct rpc_task_setup task_setup = {
5664                 .rpc_client = clp->cl_rpcclient,
5665                 .rpc_message = &msg,
5666                 .callback_ops = &nfs4_get_lease_time_ops,
5667                 .callback_data = &data,
5668                 .flags = RPC_TASK_TIMEOUT,
5669         };
5670         int status;
5671
5672         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5673         nfs4_set_sequence_privileged(&args.la_seq_args);
5674         dprintk("--> %s\n", __func__);
5675         task = rpc_run_task(&task_setup);
5676
5677         if (IS_ERR(task))
5678                 status = PTR_ERR(task);
5679         else {
5680                 status = task->tk_status;
5681                 rpc_put_task(task);
5682         }
5683         dprintk("<-- %s return %d\n", __func__, status);
5684
5685         return status;
5686 }
5687
5688 /*
5689  * Initialize the values to be used by the client in CREATE_SESSION
5690  * If nfs4_init_session set the fore channel request and response sizes,
5691  * use them.
5692  *
5693  * Set the back channel max_resp_sz_cached to zero to force the client to
5694  * always set csa_cachethis to FALSE because the current implementation
5695  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5696  */
5697 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5698 {
5699         struct nfs4_session *session = args->client->cl_session;
5700         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5701                      mxresp_sz = session->fc_target_max_resp_sz;
5702
5703         if (mxrqst_sz == 0)
5704                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5705         if (mxresp_sz == 0)
5706                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5707         /* Fore channel attributes */
5708         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5709         args->fc_attrs.max_resp_sz = mxresp_sz;
5710         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5711         args->fc_attrs.max_reqs = max_session_slots;
5712
5713         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5714                 "max_ops=%u max_reqs=%u\n",
5715                 __func__,
5716                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5717                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5718
5719         /* Back channel attributes */
5720         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5721         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5722         args->bc_attrs.max_resp_sz_cached = 0;
5723         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5724         args->bc_attrs.max_reqs = 1;
5725
5726         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5727                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5728                 __func__,
5729                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5730                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5731                 args->bc_attrs.max_reqs);
5732 }
5733
5734 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5735 {
5736         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5737         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5738
5739         if (rcvd->max_resp_sz > sent->max_resp_sz)
5740                 return -EINVAL;
5741         /*
5742          * Our requested max_ops is the minimum we need; we're not
5743          * prepared to break up compounds into smaller pieces than that.
5744          * So, no point even trying to continue if the server won't
5745          * cooperate:
5746          */
5747         if (rcvd->max_ops < sent->max_ops)
5748                 return -EINVAL;
5749         if (rcvd->max_reqs == 0)
5750                 return -EINVAL;
5751         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5752                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5753         return 0;
5754 }
5755
5756 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5757 {
5758         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5759         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5760
5761         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5762                 return -EINVAL;
5763         if (rcvd->max_resp_sz < sent->max_resp_sz)
5764                 return -EINVAL;
5765         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5766                 return -EINVAL;
5767         /* These would render the backchannel useless: */
5768         if (rcvd->max_ops != sent->max_ops)
5769                 return -EINVAL;
5770         if (rcvd->max_reqs != sent->max_reqs)
5771                 return -EINVAL;
5772         return 0;
5773 }
5774
5775 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5776                                      struct nfs4_session *session)
5777 {
5778         int ret;
5779
5780         ret = nfs4_verify_fore_channel_attrs(args, session);
5781         if (ret)
5782                 return ret;
5783         return nfs4_verify_back_channel_attrs(args, session);
5784 }
5785
5786 static int _nfs4_proc_create_session(struct nfs_client *clp,
5787                 struct rpc_cred *cred)
5788 {
5789         struct nfs4_session *session = clp->cl_session;
5790         struct nfs41_create_session_args args = {
5791                 .client = clp,
5792                 .cb_program = NFS4_CALLBACK,
5793         };
5794         struct nfs41_create_session_res res = {
5795                 .client = clp,
5796         };
5797         struct rpc_message msg = {
5798                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5799                 .rpc_argp = &args,
5800                 .rpc_resp = &res,
5801                 .rpc_cred = cred,
5802         };
5803         int status;
5804
5805         nfs4_init_channel_attrs(&args);
5806         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5807
5808         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5809
5810         if (!status) {
5811                 /* Verify the session's negotiated channel_attrs values */
5812                 status = nfs4_verify_channel_attrs(&args, session);
5813                 /* Increment the clientid slot sequence id */
5814                 clp->cl_seqid++;
5815         }
5816
5817         return status;
5818 }
5819
5820 /*
5821  * Issues a CREATE_SESSION operation to the server.
5822  * It is the responsibility of the caller to verify the session is
5823  * expired before calling this routine.
5824  */
5825 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5826 {
5827         int status;
5828         unsigned *ptr;
5829         struct nfs4_session *session = clp->cl_session;
5830
5831         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5832
5833         status = _nfs4_proc_create_session(clp, cred);
5834         if (status)
5835                 goto out;
5836
5837         /* Init or reset the session slot tables */
5838         status = nfs4_setup_session_slot_tables(session);
5839         dprintk("slot table setup returned %d\n", status);
5840         if (status)
5841                 goto out;
5842
5843         ptr = (unsigned *)&session->sess_id.data[0];
5844         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5845                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5846 out:
5847         dprintk("<-- %s\n", __func__);
5848         return status;
5849 }
5850
5851 /*
5852  * Issue the over-the-wire RPC DESTROY_SESSION.
5853  * The caller must serialize access to this routine.
5854  */
5855 int nfs4_proc_destroy_session(struct nfs4_session *session,
5856                 struct rpc_cred *cred)
5857 {
5858         struct rpc_message msg = {
5859                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5860                 .rpc_argp = session,
5861                 .rpc_cred = cred,
5862         };
5863         int status = 0;
5864
5865         dprintk("--> nfs4_proc_destroy_session\n");
5866
5867         /* session is still being setup */
5868         if (session->clp->cl_cons_state != NFS_CS_READY)
5869                 return status;
5870
5871         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5872
5873         if (status)
5874                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5875                         "Session has been destroyed regardless...\n", status);
5876
5877         dprintk("<-- nfs4_proc_destroy_session\n");
5878         return status;
5879 }
5880
5881 /*
5882  * Renew the cl_session lease.
5883  */
5884 struct nfs4_sequence_data {
5885         struct nfs_client *clp;
5886         struct nfs4_sequence_args args;
5887         struct nfs4_sequence_res res;
5888 };
5889
5890 static void nfs41_sequence_release(void *data)
5891 {
5892         struct nfs4_sequence_data *calldata = data;
5893         struct nfs_client *clp = calldata->clp;
5894
5895         if (atomic_read(&clp->cl_count) > 1)
5896                 nfs4_schedule_state_renewal(clp);
5897         nfs_put_client(clp);
5898         kfree(calldata);
5899 }
5900
5901 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5902 {
5903         switch(task->tk_status) {
5904         case -NFS4ERR_DELAY:
5905                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5906                 return -EAGAIN;
5907         default:
5908                 nfs4_schedule_lease_recovery(clp);
5909         }
5910         return 0;
5911 }
5912
5913 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5914 {
5915         struct nfs4_sequence_data *calldata = data;
5916         struct nfs_client *clp = calldata->clp;
5917
5918         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5919                 return;
5920
5921         if (task->tk_status < 0) {
5922                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5923                 if (atomic_read(&clp->cl_count) == 1)
5924                         goto out;
5925
5926                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5927                         rpc_restart_call_prepare(task);
5928                         return;
5929                 }
5930         }
5931         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5932 out:
5933         dprintk("<-- %s\n", __func__);
5934 }
5935
5936 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5937 {
5938         struct nfs4_sequence_data *calldata = data;
5939         struct nfs_client *clp = calldata->clp;
5940         struct nfs4_sequence_args *args;
5941         struct nfs4_sequence_res *res;
5942
5943         args = task->tk_msg.rpc_argp;
5944         res = task->tk_msg.rpc_resp;
5945
5946         nfs41_setup_sequence(clp->cl_session, args, res, task);
5947 }
5948
5949 static const struct rpc_call_ops nfs41_sequence_ops = {
5950         .rpc_call_done = nfs41_sequence_call_done,
5951         .rpc_call_prepare = nfs41_sequence_prepare,
5952         .rpc_release = nfs41_sequence_release,
5953 };
5954
5955 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5956                 struct rpc_cred *cred,
5957                 bool is_privileged)
5958 {
5959         struct nfs4_sequence_data *calldata;
5960         struct rpc_message msg = {
5961                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5962                 .rpc_cred = cred,
5963         };
5964         struct rpc_task_setup task_setup_data = {
5965                 .rpc_client = clp->cl_rpcclient,
5966                 .rpc_message = &msg,
5967                 .callback_ops = &nfs41_sequence_ops,
5968                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
5969         };
5970
5971         if (!atomic_inc_not_zero(&clp->cl_count))
5972                 return ERR_PTR(-EIO);
5973         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5974         if (calldata == NULL) {
5975                 nfs_put_client(clp);
5976                 return ERR_PTR(-ENOMEM);
5977         }
5978         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5979         if (is_privileged)
5980                 nfs4_set_sequence_privileged(&calldata->args);
5981         msg.rpc_argp = &calldata->args;
5982         msg.rpc_resp = &calldata->res;
5983         calldata->clp = clp;
5984         task_setup_data.callback_data = calldata;
5985
5986         return rpc_run_task(&task_setup_data);
5987 }
5988
5989 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5990 {
5991         struct rpc_task *task;
5992         int ret = 0;
5993
5994         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5995                 return 0;
5996         task = _nfs41_proc_sequence(clp, cred, false);
5997         if (IS_ERR(task))
5998                 ret = PTR_ERR(task);
5999         else
6000                 rpc_put_task_async(task);
6001         dprintk("<-- %s status=%d\n", __func__, ret);
6002         return ret;
6003 }
6004
6005 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6006 {
6007         struct rpc_task *task;
6008         int ret;
6009
6010         task = _nfs41_proc_sequence(clp, cred, true);
6011         if (IS_ERR(task)) {
6012                 ret = PTR_ERR(task);
6013                 goto out;
6014         }
6015         ret = rpc_wait_for_completion_task(task);
6016         if (!ret) {
6017                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6018
6019                 if (task->tk_status == 0)
6020                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6021                 ret = task->tk_status;
6022         }
6023         rpc_put_task(task);
6024 out:
6025         dprintk("<-- %s status=%d\n", __func__, ret);
6026         return ret;
6027 }
6028
6029 struct nfs4_reclaim_complete_data {
6030         struct nfs_client *clp;
6031         struct nfs41_reclaim_complete_args arg;
6032         struct nfs41_reclaim_complete_res res;
6033 };
6034
6035 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6036 {
6037         struct nfs4_reclaim_complete_data *calldata = data;
6038
6039         nfs41_setup_sequence(calldata->clp->cl_session,
6040                         &calldata->arg.seq_args,
6041                         &calldata->res.seq_res,
6042                         task);
6043 }
6044
6045 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6046 {
6047         switch(task->tk_status) {
6048         case 0:
6049         case -NFS4ERR_COMPLETE_ALREADY:
6050         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6051                 break;
6052         case -NFS4ERR_DELAY:
6053                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6054                 /* fall through */
6055         case -NFS4ERR_RETRY_UNCACHED_REP:
6056                 return -EAGAIN;
6057         default:
6058                 nfs4_schedule_lease_recovery(clp);
6059         }
6060         return 0;
6061 }
6062
6063 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6064 {
6065         struct nfs4_reclaim_complete_data *calldata = data;
6066         struct nfs_client *clp = calldata->clp;
6067         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6068
6069         dprintk("--> %s\n", __func__);
6070         if (!nfs41_sequence_done(task, res))
6071                 return;
6072
6073         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6074                 rpc_restart_call_prepare(task);
6075                 return;
6076         }
6077         dprintk("<-- %s\n", __func__);
6078 }
6079
6080 static void nfs4_free_reclaim_complete_data(void *data)
6081 {
6082         struct nfs4_reclaim_complete_data *calldata = data;
6083
6084         kfree(calldata);
6085 }
6086
6087 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6088         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6089         .rpc_call_done = nfs4_reclaim_complete_done,
6090         .rpc_release = nfs4_free_reclaim_complete_data,
6091 };
6092
6093 /*
6094  * Issue a global reclaim complete.
6095  */
6096 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6097 {
6098         struct nfs4_reclaim_complete_data *calldata;
6099         struct rpc_task *task;
6100         struct rpc_message msg = {
6101                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6102         };
6103         struct rpc_task_setup task_setup_data = {
6104                 .rpc_client = clp->cl_rpcclient,
6105                 .rpc_message = &msg,
6106                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6107                 .flags = RPC_TASK_ASYNC,
6108         };
6109         int status = -ENOMEM;
6110
6111         dprintk("--> %s\n", __func__);
6112         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6113         if (calldata == NULL)
6114                 goto out;
6115         calldata->clp = clp;
6116         calldata->arg.one_fs = 0;
6117
6118         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6119         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6120         msg.rpc_argp = &calldata->arg;
6121         msg.rpc_resp = &calldata->res;
6122         task_setup_data.callback_data = calldata;
6123         task = rpc_run_task(&task_setup_data);
6124         if (IS_ERR(task)) {
6125                 status = PTR_ERR(task);
6126                 goto out;
6127         }
6128         status = nfs4_wait_for_completion_rpc_task(task);
6129         if (status == 0)
6130                 status = task->tk_status;
6131         rpc_put_task(task);
6132         return 0;
6133 out:
6134         dprintk("<-- %s status=%d\n", __func__, status);
6135         return status;
6136 }
6137
6138 static void
6139 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6140 {
6141         struct nfs4_layoutget *lgp = calldata;
6142         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6143         struct nfs4_session *session = nfs4_get_session(server);
6144
6145         dprintk("--> %s\n", __func__);
6146         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6147          * right now covering the LAYOUTGET we are about to send.
6148          * However, that is not so catastrophic, and there seems
6149          * to be no way to prevent it completely.
6150          */
6151         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6152                                 &lgp->res.seq_res, task))
6153                 return;
6154         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6155                                           NFS_I(lgp->args.inode)->layout,
6156                                           lgp->args.ctx->state)) {
6157                 rpc_exit(task, NFS4_OK);
6158         }
6159 }
6160
6161 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6162 {
6163         struct nfs4_layoutget *lgp = calldata;
6164         struct inode *inode = lgp->args.inode;
6165         struct nfs_server *server = NFS_SERVER(inode);
6166         struct pnfs_layout_hdr *lo;
6167         struct nfs4_state *state = NULL;
6168         unsigned long timeo, giveup;
6169
6170         dprintk("--> %s\n", __func__);
6171
6172         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6173                 goto out;
6174
6175         switch (task->tk_status) {
6176         case 0:
6177                 goto out;
6178         case -NFS4ERR_LAYOUTTRYLATER:
6179         case -NFS4ERR_RECALLCONFLICT:
6180                 timeo = rpc_get_timeout(task->tk_client);
6181                 giveup = lgp->args.timestamp + timeo;
6182                 if (time_after(giveup, jiffies))
6183                         task->tk_status = -NFS4ERR_DELAY;
6184                 break;
6185         case -NFS4ERR_EXPIRED:
6186         case -NFS4ERR_BAD_STATEID:
6187                 spin_lock(&inode->i_lock);
6188                 lo = NFS_I(inode)->layout;
6189                 if (!lo || list_empty(&lo->plh_segs)) {
6190                         spin_unlock(&inode->i_lock);
6191                         /* If the open stateid was bad, then recover it. */
6192                         state = lgp->args.ctx->state;
6193                 } else {
6194                         LIST_HEAD(head);
6195
6196                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6197                         spin_unlock(&inode->i_lock);
6198                         /* Mark the bad layout state as invalid, then
6199                          * retry using the open stateid. */
6200                         pnfs_free_lseg_list(&head);
6201                 }
6202         }
6203         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6204                 rpc_restart_call_prepare(task);
6205 out:
6206         dprintk("<-- %s\n", __func__);
6207 }
6208
6209 static size_t max_response_pages(struct nfs_server *server)
6210 {
6211         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6212         return nfs_page_array_len(0, max_resp_sz);
6213 }
6214
6215 static void nfs4_free_pages(struct page **pages, size_t size)
6216 {
6217         int i;
6218
6219         if (!pages)
6220                 return;
6221
6222         for (i = 0; i < size; i++) {
6223                 if (!pages[i])
6224                         break;
6225                 __free_page(pages[i]);
6226         }
6227         kfree(pages);
6228 }
6229
6230 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6231 {
6232         struct page **pages;
6233         int i;
6234
6235         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6236         if (!pages) {
6237                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6238                 return NULL;
6239         }
6240
6241         for (i = 0; i < size; i++) {
6242                 pages[i] = alloc_page(gfp_flags);
6243                 if (!pages[i]) {
6244                         dprintk("%s: failed to allocate page\n", __func__);
6245                         nfs4_free_pages(pages, size);
6246                         return NULL;
6247                 }
6248         }
6249
6250         return pages;
6251 }
6252
6253 static void nfs4_layoutget_release(void *calldata)
6254 {
6255         struct nfs4_layoutget *lgp = calldata;
6256         struct inode *inode = lgp->args.inode;
6257         struct nfs_server *server = NFS_SERVER(inode);
6258         size_t max_pages = max_response_pages(server);
6259
6260         dprintk("--> %s\n", __func__);
6261         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6262         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6263         put_nfs_open_context(lgp->args.ctx);
6264         kfree(calldata);
6265         dprintk("<-- %s\n", __func__);
6266 }
6267
6268 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6269         .rpc_call_prepare = nfs4_layoutget_prepare,
6270         .rpc_call_done = nfs4_layoutget_done,
6271         .rpc_release = nfs4_layoutget_release,
6272 };
6273
6274 struct pnfs_layout_segment *
6275 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6276 {
6277         struct inode *inode = lgp->args.inode;
6278         struct nfs_server *server = NFS_SERVER(inode);
6279         size_t max_pages = max_response_pages(server);
6280         struct rpc_task *task;
6281         struct rpc_message msg = {
6282                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6283                 .rpc_argp = &lgp->args,
6284                 .rpc_resp = &lgp->res,
6285         };
6286         struct rpc_task_setup task_setup_data = {
6287                 .rpc_client = server->client,
6288                 .rpc_message = &msg,
6289                 .callback_ops = &nfs4_layoutget_call_ops,
6290                 .callback_data = lgp,
6291                 .flags = RPC_TASK_ASYNC,
6292         };
6293         struct pnfs_layout_segment *lseg = NULL;
6294         int status = 0;
6295
6296         dprintk("--> %s\n", __func__);
6297
6298         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6299         if (!lgp->args.layout.pages) {
6300                 nfs4_layoutget_release(lgp);
6301                 return ERR_PTR(-ENOMEM);
6302         }
6303         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6304         lgp->args.timestamp = jiffies;
6305
6306         lgp->res.layoutp = &lgp->args.layout;
6307         lgp->res.seq_res.sr_slot = NULL;
6308         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6309
6310         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6311         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6312
6313         task = rpc_run_task(&task_setup_data);
6314         if (IS_ERR(task))
6315                 return ERR_CAST(task);
6316         status = nfs4_wait_for_completion_rpc_task(task);
6317         if (status == 0)
6318                 status = task->tk_status;
6319         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6320         if (status == 0 && lgp->res.layoutp->len)
6321                 lseg = pnfs_layout_process(lgp);
6322         rpc_put_task(task);
6323         dprintk("<-- %s status=%d\n", __func__, status);
6324         if (status)
6325                 return ERR_PTR(status);
6326         return lseg;
6327 }
6328
6329 static void
6330 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6331 {
6332         struct nfs4_layoutreturn *lrp = calldata;
6333
6334         dprintk("--> %s\n", __func__);
6335         nfs41_setup_sequence(lrp->clp->cl_session,
6336                         &lrp->args.seq_args,
6337                         &lrp->res.seq_res,
6338                         task);
6339 }
6340
6341 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6342 {
6343         struct nfs4_layoutreturn *lrp = calldata;
6344         struct nfs_server *server;
6345
6346         dprintk("--> %s\n", __func__);
6347
6348         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6349                 return;
6350
6351         server = NFS_SERVER(lrp->args.inode);
6352         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6353                 rpc_restart_call_prepare(task);
6354                 return;
6355         }
6356         dprintk("<-- %s\n", __func__);
6357 }
6358
6359 static void nfs4_layoutreturn_release(void *calldata)
6360 {
6361         struct nfs4_layoutreturn *lrp = calldata;
6362         struct pnfs_layout_hdr *lo = lrp->args.layout;
6363
6364         dprintk("--> %s\n", __func__);
6365         spin_lock(&lo->plh_inode->i_lock);
6366         if (lrp->res.lrs_present)
6367                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6368         lo->plh_block_lgets--;
6369         spin_unlock(&lo->plh_inode->i_lock);
6370         pnfs_put_layout_hdr(lrp->args.layout);
6371         kfree(calldata);
6372         dprintk("<-- %s\n", __func__);
6373 }
6374
6375 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6376         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6377         .rpc_call_done = nfs4_layoutreturn_done,
6378         .rpc_release = nfs4_layoutreturn_release,
6379 };
6380
6381 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6382 {
6383         struct rpc_task *task;
6384         struct rpc_message msg = {
6385                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6386                 .rpc_argp = &lrp->args,
6387                 .rpc_resp = &lrp->res,
6388         };
6389         struct rpc_task_setup task_setup_data = {
6390                 .rpc_client = lrp->clp->cl_rpcclient,
6391                 .rpc_message = &msg,
6392                 .callback_ops = &nfs4_layoutreturn_call_ops,
6393                 .callback_data = lrp,
6394         };
6395         int status;
6396
6397         dprintk("--> %s\n", __func__);
6398         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6399         task = rpc_run_task(&task_setup_data);
6400         if (IS_ERR(task))
6401                 return PTR_ERR(task);
6402         status = task->tk_status;
6403         dprintk("<-- %s status=%d\n", __func__, status);
6404         rpc_put_task(task);
6405         return status;
6406 }
6407
6408 /*
6409  * Retrieve the list of Data Server devices from the MDS.
6410  */
6411 static int _nfs4_getdevicelist(struct nfs_server *server,
6412                                     const struct nfs_fh *fh,
6413                                     struct pnfs_devicelist *devlist)
6414 {
6415         struct nfs4_getdevicelist_args args = {
6416                 .fh = fh,
6417                 .layoutclass = server->pnfs_curr_ld->id,
6418         };
6419         struct nfs4_getdevicelist_res res = {
6420                 .devlist = devlist,
6421         };
6422         struct rpc_message msg = {
6423                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6424                 .rpc_argp = &args,
6425                 .rpc_resp = &res,
6426         };
6427         int status;
6428
6429         dprintk("--> %s\n", __func__);
6430         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6431                                 &res.seq_res, 0);
6432         dprintk("<-- %s status=%d\n", __func__, status);
6433         return status;
6434 }
6435
6436 int nfs4_proc_getdevicelist(struct nfs_server *server,
6437                             const struct nfs_fh *fh,
6438                             struct pnfs_devicelist *devlist)
6439 {
6440         struct nfs4_exception exception = { };
6441         int err;
6442
6443         do {
6444                 err = nfs4_handle_exception(server,
6445                                 _nfs4_getdevicelist(server, fh, devlist),
6446                                 &exception);
6447         } while (exception.retry);
6448
6449         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6450                 err, devlist->num_devs);
6451
6452         return err;
6453 }
6454 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6455
6456 static int
6457 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6458 {
6459         struct nfs4_getdeviceinfo_args args = {
6460                 .pdev = pdev,
6461         };
6462         struct nfs4_getdeviceinfo_res res = {
6463                 .pdev = pdev,
6464         };
6465         struct rpc_message msg = {
6466                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6467                 .rpc_argp = &args,
6468                 .rpc_resp = &res,
6469         };
6470         int status;
6471
6472         dprintk("--> %s\n", __func__);
6473         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6474         dprintk("<-- %s status=%d\n", __func__, status);
6475
6476         return status;
6477 }
6478
6479 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6480 {
6481         struct nfs4_exception exception = { };
6482         int err;
6483
6484         do {
6485                 err = nfs4_handle_exception(server,
6486                                         _nfs4_proc_getdeviceinfo(server, pdev),
6487                                         &exception);
6488         } while (exception.retry);
6489         return err;
6490 }
6491 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6492
6493 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6494 {
6495         struct nfs4_layoutcommit_data *data = calldata;
6496         struct nfs_server *server = NFS_SERVER(data->args.inode);
6497         struct nfs4_session *session = nfs4_get_session(server);
6498
6499         nfs41_setup_sequence(session,
6500                         &data->args.seq_args,
6501                         &data->res.seq_res,
6502                         task);
6503 }
6504
6505 static void
6506 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6507 {
6508         struct nfs4_layoutcommit_data *data = calldata;
6509         struct nfs_server *server = NFS_SERVER(data->args.inode);
6510
6511         if (!nfs41_sequence_done(task, &data->res.seq_res))
6512                 return;
6513
6514         switch (task->tk_status) { /* Just ignore these failures */
6515         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6516         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6517         case -NFS4ERR_BADLAYOUT:     /* no layout */
6518         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6519                 task->tk_status = 0;
6520                 break;
6521         case 0:
6522                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6523                                                    data->res.fattr);
6524                 break;
6525         default:
6526                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6527                         rpc_restart_call_prepare(task);
6528                         return;
6529                 }
6530         }
6531 }
6532
6533 static void nfs4_layoutcommit_release(void *calldata)
6534 {
6535         struct nfs4_layoutcommit_data *data = calldata;
6536
6537         pnfs_cleanup_layoutcommit(data);
6538         put_rpccred(data->cred);
6539         kfree(data);
6540 }
6541
6542 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6543         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6544         .rpc_call_done = nfs4_layoutcommit_done,
6545         .rpc_release = nfs4_layoutcommit_release,
6546 };
6547
6548 int
6549 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6550 {
6551         struct rpc_message msg = {
6552                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6553                 .rpc_argp = &data->args,
6554                 .rpc_resp = &data->res,
6555                 .rpc_cred = data->cred,
6556         };
6557         struct rpc_task_setup task_setup_data = {
6558                 .task = &data->task,
6559                 .rpc_client = NFS_CLIENT(data->args.inode),
6560                 .rpc_message = &msg,
6561                 .callback_ops = &nfs4_layoutcommit_ops,
6562                 .callback_data = data,
6563                 .flags = RPC_TASK_ASYNC,
6564         };
6565         struct rpc_task *task;
6566         int status = 0;
6567
6568         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6569                 "lbw: %llu inode %lu\n",
6570                 data->task.tk_pid, sync,
6571                 data->args.lastbytewritten,
6572                 data->args.inode->i_ino);
6573
6574         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6575         task = rpc_run_task(&task_setup_data);
6576         if (IS_ERR(task))
6577                 return PTR_ERR(task);
6578         if (sync == false)
6579                 goto out;
6580         status = nfs4_wait_for_completion_rpc_task(task);
6581         if (status != 0)
6582                 goto out;
6583         status = task->tk_status;
6584 out:
6585         dprintk("%s: status %d\n", __func__, status);
6586         rpc_put_task(task);
6587         return status;
6588 }
6589
6590 static int
6591 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6592                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6593 {
6594         struct nfs41_secinfo_no_name_args args = {
6595                 .style = SECINFO_STYLE_CURRENT_FH,
6596         };
6597         struct nfs4_secinfo_res res = {
6598                 .flavors = flavors,
6599         };
6600         struct rpc_message msg = {
6601                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6602                 .rpc_argp = &args,
6603                 .rpc_resp = &res,
6604         };
6605         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6606 }
6607
6608 static int
6609 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6610                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6611 {
6612         struct nfs4_exception exception = { };
6613         int err;
6614         do {
6615                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6616                 switch (err) {
6617                 case 0:
6618                 case -NFS4ERR_WRONGSEC:
6619                 case -NFS4ERR_NOTSUPP:
6620                         goto out;
6621                 default:
6622                         err = nfs4_handle_exception(server, err, &exception);
6623                 }
6624         } while (exception.retry);
6625 out:
6626         return err;
6627 }
6628
6629 static int
6630 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6631                     struct nfs_fsinfo *info)
6632 {
6633         int err;
6634         struct page *page;
6635         rpc_authflavor_t flavor;
6636         struct nfs4_secinfo_flavors *flavors;
6637
6638         page = alloc_page(GFP_KERNEL);
6639         if (!page) {
6640                 err = -ENOMEM;
6641                 goto out;
6642         }
6643
6644         flavors = page_address(page);
6645         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6646
6647         /*
6648          * Fall back on "guess and check" method if
6649          * the server doesn't support SECINFO_NO_NAME
6650          */
6651         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6652                 err = nfs4_find_root_sec(server, fhandle, info);
6653                 goto out_freepage;
6654         }
6655         if (err)
6656                 goto out_freepage;
6657
6658         flavor = nfs_find_best_sec(flavors);
6659         if (err == 0)
6660                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6661
6662 out_freepage:
6663         put_page(page);
6664         if (err == -EACCES)
6665                 return -EPERM;
6666 out:
6667         return err;
6668 }
6669
6670 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6671 {
6672         int status;
6673         struct nfs41_test_stateid_args args = {
6674                 .stateid = stateid,
6675         };
6676         struct nfs41_test_stateid_res res;
6677         struct rpc_message msg = {
6678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6679                 .rpc_argp = &args,
6680                 .rpc_resp = &res,
6681         };
6682
6683         dprintk("NFS call  test_stateid %p\n", stateid);
6684         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6685         nfs4_set_sequence_privileged(&args.seq_args);
6686         status = nfs4_call_sync_sequence(server->client, server, &msg,
6687                         &args.seq_args, &res.seq_res);
6688         if (status != NFS_OK) {
6689                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6690                 return status;
6691         }
6692         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6693         return -res.status;
6694 }
6695
6696 /**
6697  * nfs41_test_stateid - perform a TEST_STATEID operation
6698  *
6699  * @server: server / transport on which to perform the operation
6700  * @stateid: state ID to test
6701  *
6702  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6703  * Otherwise a negative NFS4ERR value is returned if the operation
6704  * failed or the state ID is not currently valid.
6705  */
6706 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6707 {
6708         struct nfs4_exception exception = { };
6709         int err;
6710         do {
6711                 err = _nfs41_test_stateid(server, stateid);
6712                 if (err != -NFS4ERR_DELAY)
6713                         break;
6714                 nfs4_handle_exception(server, err, &exception);
6715         } while (exception.retry);
6716         return err;
6717 }
6718
6719 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6720 {
6721         struct nfs41_free_stateid_args args = {
6722                 .stateid = stateid,
6723         };
6724         struct nfs41_free_stateid_res res;
6725         struct rpc_message msg = {
6726                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6727                 .rpc_argp = &args,
6728                 .rpc_resp = &res,
6729         };
6730         int status;
6731
6732         dprintk("NFS call  free_stateid %p\n", stateid);
6733         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6734         nfs4_set_sequence_privileged(&args.seq_args);
6735         status = nfs4_call_sync_sequence(server->client, server, &msg,
6736                         &args.seq_args, &res.seq_res);
6737         dprintk("NFS reply free_stateid: %d\n", status);
6738         return status;
6739 }
6740
6741 /**
6742  * nfs41_free_stateid - perform a FREE_STATEID operation
6743  *
6744  * @server: server / transport on which to perform the operation
6745  * @stateid: state ID to release
6746  *
6747  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6748  * negative NFS4ERR value is returned.
6749  */
6750 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6751 {
6752         struct nfs4_exception exception = { };
6753         int err;
6754         do {
6755                 err = _nfs4_free_stateid(server, stateid);
6756                 if (err != -NFS4ERR_DELAY)
6757                         break;
6758                 nfs4_handle_exception(server, err, &exception);
6759         } while (exception.retry);
6760         return err;
6761 }
6762
6763 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6764                 const nfs4_stateid *s2)
6765 {
6766         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6767                 return false;
6768
6769         if (s1->seqid == s2->seqid)
6770                 return true;
6771         if (s1->seqid == 0 || s2->seqid == 0)
6772                 return true;
6773
6774         return false;
6775 }
6776
6777 #endif /* CONFIG_NFS_V4_1 */
6778
6779 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6780                 const nfs4_stateid *s2)
6781 {
6782         return nfs4_stateid_match(s1, s2);
6783 }
6784
6785
6786 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6787         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6788         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6789         .recover_open   = nfs4_open_reclaim,
6790         .recover_lock   = nfs4_lock_reclaim,
6791         .establish_clid = nfs4_init_clientid,
6792         .get_clid_cred  = nfs4_get_setclientid_cred,
6793         .detect_trunking = nfs40_discover_server_trunking,
6794 };
6795
6796 #if defined(CONFIG_NFS_V4_1)
6797 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6798         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6799         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6800         .recover_open   = nfs4_open_reclaim,
6801         .recover_lock   = nfs4_lock_reclaim,
6802         .establish_clid = nfs41_init_clientid,
6803         .get_clid_cred  = nfs4_get_exchange_id_cred,
6804         .reclaim_complete = nfs41_proc_reclaim_complete,
6805         .detect_trunking = nfs41_discover_server_trunking,
6806 };
6807 #endif /* CONFIG_NFS_V4_1 */
6808
6809 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6810         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6811         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6812         .recover_open   = nfs4_open_expired,
6813         .recover_lock   = nfs4_lock_expired,
6814         .establish_clid = nfs4_init_clientid,
6815         .get_clid_cred  = nfs4_get_setclientid_cred,
6816 };
6817
6818 #if defined(CONFIG_NFS_V4_1)
6819 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6820         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6821         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6822         .recover_open   = nfs41_open_expired,
6823         .recover_lock   = nfs41_lock_expired,
6824         .establish_clid = nfs41_init_clientid,
6825         .get_clid_cred  = nfs4_get_exchange_id_cred,
6826 };
6827 #endif /* CONFIG_NFS_V4_1 */
6828
6829 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6830         .sched_state_renewal = nfs4_proc_async_renew,
6831         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6832         .renew_lease = nfs4_proc_renew,
6833 };
6834
6835 #if defined(CONFIG_NFS_V4_1)
6836 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6837         .sched_state_renewal = nfs41_proc_async_sequence,
6838         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6839         .renew_lease = nfs4_proc_sequence,
6840 };
6841 #endif
6842
6843 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6844         .minor_version = 0,
6845         .init_caps = NFS_CAP_READDIRPLUS
6846                 | NFS_CAP_ATOMIC_OPEN
6847                 | NFS_CAP_CHANGE_ATTR
6848                 | NFS_CAP_POSIX_LOCK,
6849         .call_sync = _nfs4_call_sync,
6850         .match_stateid = nfs4_match_stateid,
6851         .find_root_sec = nfs4_find_root_sec,
6852         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6853         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6854         .state_renewal_ops = &nfs40_state_renewal_ops,
6855 };
6856
6857 #if defined(CONFIG_NFS_V4_1)
6858 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6859         .minor_version = 1,
6860         .init_caps = NFS_CAP_READDIRPLUS
6861                 | NFS_CAP_ATOMIC_OPEN
6862                 | NFS_CAP_CHANGE_ATTR
6863                 | NFS_CAP_POSIX_LOCK
6864                 | NFS_CAP_STATEID_NFSV41
6865                 | NFS_CAP_ATOMIC_OPEN_V1,
6866         .call_sync = nfs4_call_sync_sequence,
6867         .match_stateid = nfs41_match_stateid,
6868         .find_root_sec = nfs41_find_root_sec,
6869         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6870         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6871         .state_renewal_ops = &nfs41_state_renewal_ops,
6872 };
6873 #endif
6874
6875 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6876         [0] = &nfs_v4_0_minor_ops,
6877 #if defined(CONFIG_NFS_V4_1)
6878         [1] = &nfs_v4_1_minor_ops,
6879 #endif
6880 };
6881
6882 const struct inode_operations nfs4_dir_inode_operations = {
6883         .create         = nfs_create,
6884         .lookup         = nfs_lookup,
6885         .atomic_open    = nfs_atomic_open,
6886         .link           = nfs_link,
6887         .unlink         = nfs_unlink,
6888         .symlink        = nfs_symlink,
6889         .mkdir          = nfs_mkdir,
6890         .rmdir          = nfs_rmdir,
6891         .mknod          = nfs_mknod,
6892         .rename         = nfs_rename,
6893         .permission     = nfs_permission,
6894         .getattr        = nfs_getattr,
6895         .setattr        = nfs_setattr,
6896         .getxattr       = generic_getxattr,
6897         .setxattr       = generic_setxattr,
6898         .listxattr      = generic_listxattr,
6899         .removexattr    = generic_removexattr,
6900 };
6901
6902 static const struct inode_operations nfs4_file_inode_operations = {
6903         .permission     = nfs_permission,
6904         .getattr        = nfs_getattr,
6905         .setattr        = nfs_setattr,
6906         .getxattr       = generic_getxattr,
6907         .setxattr       = generic_setxattr,
6908         .listxattr      = generic_listxattr,
6909         .removexattr    = generic_removexattr,
6910 };
6911
6912 const struct nfs_rpc_ops nfs_v4_clientops = {
6913         .version        = 4,                    /* protocol version */
6914         .dentry_ops     = &nfs4_dentry_operations,
6915         .dir_inode_ops  = &nfs4_dir_inode_operations,
6916         .file_inode_ops = &nfs4_file_inode_operations,
6917         .file_ops       = &nfs4_file_operations,
6918         .getroot        = nfs4_proc_get_root,
6919         .submount       = nfs4_submount,
6920         .try_mount      = nfs4_try_mount,
6921         .getattr        = nfs4_proc_getattr,
6922         .setattr        = nfs4_proc_setattr,
6923         .lookup         = nfs4_proc_lookup,
6924         .access         = nfs4_proc_access,
6925         .readlink       = nfs4_proc_readlink,
6926         .create         = nfs4_proc_create,
6927         .remove         = nfs4_proc_remove,
6928         .unlink_setup   = nfs4_proc_unlink_setup,
6929         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6930         .unlink_done    = nfs4_proc_unlink_done,
6931         .rename         = nfs4_proc_rename,
6932         .rename_setup   = nfs4_proc_rename_setup,
6933         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6934         .rename_done    = nfs4_proc_rename_done,
6935         .link           = nfs4_proc_link,
6936         .symlink        = nfs4_proc_symlink,
6937         .mkdir          = nfs4_proc_mkdir,
6938         .rmdir          = nfs4_proc_remove,
6939         .readdir        = nfs4_proc_readdir,
6940         .mknod          = nfs4_proc_mknod,
6941         .statfs         = nfs4_proc_statfs,
6942         .fsinfo         = nfs4_proc_fsinfo,
6943         .pathconf       = nfs4_proc_pathconf,
6944         .set_capabilities = nfs4_server_capabilities,
6945         .decode_dirent  = nfs4_decode_dirent,
6946         .read_setup     = nfs4_proc_read_setup,
6947         .read_pageio_init = pnfs_pageio_init_read,
6948         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6949         .read_done      = nfs4_read_done,
6950         .write_setup    = nfs4_proc_write_setup,
6951         .write_pageio_init = pnfs_pageio_init_write,
6952         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6953         .write_done     = nfs4_write_done,
6954         .commit_setup   = nfs4_proc_commit_setup,
6955         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6956         .commit_done    = nfs4_commit_done,
6957         .lock           = nfs4_proc_lock,
6958         .clear_acl_cache = nfs4_zap_acl_attr,
6959         .close_context  = nfs4_close_context,
6960         .open_context   = nfs4_atomic_open,
6961         .have_delegation = nfs4_have_delegation,
6962         .return_delegation = nfs4_inode_return_delegation,
6963         .alloc_client   = nfs4_alloc_client,
6964         .init_client    = nfs4_init_client,
6965         .free_client    = nfs4_free_client,
6966         .create_server  = nfs4_create_server,
6967         .clone_server   = nfs_clone_server,
6968 };
6969
6970 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6971         .prefix = XATTR_NAME_NFSV4_ACL,
6972         .list   = nfs4_xattr_list_nfs4_acl,
6973         .get    = nfs4_xattr_get_nfs4_acl,
6974         .set    = nfs4_xattr_set_nfs4_acl,
6975 };
6976
6977 const struct xattr_handler *nfs4_xattr_handlers[] = {
6978         &nfs4_xattr_nfs4_acl_handler,
6979         NULL
6980 };
6981
6982 /*
6983  * Local variables:
6984  *  c-basic-offset: 8
6985  * End:
6986  */