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/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/nfs_idmap.h>
  56 #include <linux/sunrpc/bc_xprt.h>
  57 #include <linux/xattr.h>
  58 #include <linux/utsname.h>
  59 #include <linux/freezer.h>
  60
  61 #include "nfs4_fs.h"
  62 #include "delegation.h"
  63 #include "internal.h"
  64 #include "iostat.h"
  65 #include "callback.h"
  66 #include "pnfs.h"
  67 #include "netns.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 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  75
  76 static unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
  77
  78 struct nfs4_opendata;
  79 static int _nfs4_proc_open(struct nfs4_opendata *data);
  80 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  81 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  82 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  83 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  84 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  85 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  86 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  87                             struct nfs_fattr *fattr, struct iattr *sattr,
  88                             struct nfs4_state *state);
  89 #ifdef CONFIG_NFS_V4_1
  90 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  92 #endif
  93 /* Prevent leaks of NFSv4 errors into userland */
  94 static int nfs4_map_errors(int err)
  95 {
  96         if (err >= -1000)
  97                 return err;
  98         switch (err) {
  99         case -NFS4ERR_RESOURCE:
 100                 return -EREMOTEIO;
 101         case -NFS4ERR_WRONGSEC:
 102                 return -EPERM;
 103         case -NFS4ERR_BADOWNER:
 104         case -NFS4ERR_BADNAME:
 105                 return -EINVAL;
 106         default:
 107                 dprintk("%s could not handle NFSv4 error %d\n",
 108                                 __func__, -err);
 109                 break;
 110         }
 111         return -EIO;
 112 }
 113
 114 /*
 115  * This is our standard bitmap for GETATTR requests.
 116  */
 117 const u32 nfs4_fattr_bitmap[2] = {
 118         FATTR4_WORD0_TYPE
 119         | FATTR4_WORD0_CHANGE
 120         | FATTR4_WORD0_SIZE
 121         | FATTR4_WORD0_FSID
 122         | FATTR4_WORD0_FILEID,
 123         FATTR4_WORD1_MODE
 124         | FATTR4_WORD1_NUMLINKS
 125         | FATTR4_WORD1_OWNER
 126         | FATTR4_WORD1_OWNER_GROUP
 127         | FATTR4_WORD1_RAWDEV
 128         | FATTR4_WORD1_SPACE_USED
 129         | FATTR4_WORD1_TIME_ACCESS
 130         | FATTR4_WORD1_TIME_METADATA
 131         | FATTR4_WORD1_TIME_MODIFY
 132 };
 133
 134 const u32 nfs4_statfs_bitmap[2] = {
 135         FATTR4_WORD0_FILES_AVAIL
 136         | FATTR4_WORD0_FILES_FREE
 137         | FATTR4_WORD0_FILES_TOTAL,
 138         FATTR4_WORD1_SPACE_AVAIL
 139         | FATTR4_WORD1_SPACE_FREE
 140         | FATTR4_WORD1_SPACE_TOTAL
 141 };
 142
 143 const u32 nfs4_pathconf_bitmap[2] = {
 144         FATTR4_WORD0_MAXLINK
 145         | FATTR4_WORD0_MAXNAME,
 146         0
 147 };
 148
 149 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 150                         | FATTR4_WORD0_MAXREAD
 151                         | FATTR4_WORD0_MAXWRITE
 152                         | FATTR4_WORD0_LEASE_TIME,
 153                         FATTR4_WORD1_TIME_DELTA
 154                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 155                         FATTR4_WORD2_LAYOUT_BLKSIZE
 156 };
 157
 158 const u32 nfs4_fs_locations_bitmap[2] = {
 159         FATTR4_WORD0_TYPE
 160         | FATTR4_WORD0_CHANGE
 161         | FATTR4_WORD0_SIZE
 162         | FATTR4_WORD0_FSID
 163         | FATTR4_WORD0_FILEID
 164         | FATTR4_WORD0_FS_LOCATIONS,
 165         FATTR4_WORD1_MODE
 166         | FATTR4_WORD1_NUMLINKS
 167         | FATTR4_WORD1_OWNER
 168         | FATTR4_WORD1_OWNER_GROUP
 169         | FATTR4_WORD1_RAWDEV
 170         | FATTR4_WORD1_SPACE_USED
 171         | FATTR4_WORD1_TIME_ACCESS
 172         | FATTR4_WORD1_TIME_METADATA
 173         | FATTR4_WORD1_TIME_MODIFY
 174         | FATTR4_WORD1_MOUNTED_ON_FILEID
 175 };
 176
 177 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 178                 struct nfs4_readdir_arg *readdir)
 179 {
 180         __be32 *start, *p;
 181
 182         BUG_ON(readdir->count < 80);
 183         if (cookie > 2) {
 184                 readdir->cookie = cookie;
 185                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 186                 return;
 187         }
 188
 189         readdir->cookie = 0;
 190         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 191         if (cookie == 2)
 192                 return;
 193
 194         /*
 195          * NFSv4 servers do not return entries for '.' and '..'
 196          * Therefore, we fake these entries here.  We let '.'
 197          * have cookie 0 and '..' have cookie 1.  Note that
 198          * when talking to the server, we always send cookie 0
 199          * instead of 1 or 2.
 200          */
 201         start = p = kmap_atomic(*readdir->pages);
 202
 203         if (cookie == 0) {
 204                 *p++ = xdr_one;                                  /* next */
 205                 *p++ = xdr_zero;                   /* cookie, first word */
 206                 *p++ = xdr_one;                   /* cookie, second word */
 207                 *p++ = xdr_one;                             /* entry len */
 208                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 209                 p++;
 210                 *p++ = xdr_one;                         /* bitmap length */
 211                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 212                 *p++ = htonl(8);              /* attribute buffer length */
 213                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 214         }
 215
 216         *p++ = xdr_one;                                  /* next */
 217         *p++ = xdr_zero;                   /* cookie, first word */
 218         *p++ = xdr_two;                   /* cookie, second word */
 219         *p++ = xdr_two;                             /* entry len */
 220         memcpy(p, "..\0\0", 4);                         /* entry */
 221         p++;
 222         *p++ = xdr_one;                         /* bitmap length */
 223         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 224         *p++ = htonl(8);              /* attribute buffer length */
 225         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 226
 227         readdir->pgbase = (char *)p - (char *)start;
 228         readdir->count -= readdir->pgbase;
 229         kunmap_atomic(start);
 230 }
 231
 232 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 233 {
 234         int res;
 235
 236         might_sleep();
 237
 238         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 239                         nfs_wait_bit_killable, TASK_KILLABLE);
 240         return res;
 241 }
 242
 243 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 244 {
 245         int res = 0;
 246
 247         might_sleep();
 248
 249         if (*timeout <= 0)
 250                 *timeout = NFS4_POLL_RETRY_MIN;
 251         if (*timeout > NFS4_POLL_RETRY_MAX)
 252                 *timeout = NFS4_POLL_RETRY_MAX;
 253         freezable_schedule_timeout_killable(*timeout);
 254         if (fatal_signal_pending(current))
 255                 res = -ERESTARTSYS;
 256         *timeout <<= 1;
 257         return res;
 258 }
 259
 260 /* This is the error handling routine for processes that are allowed
 261  * to sleep.
 262  */
 263 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 264 {
 265         struct nfs_client *clp = server->nfs_client;
 266         struct nfs4_state *state = exception->state;
 267         struct inode *inode = exception->inode;
 268         int ret = errorcode;
 269
 270         exception->retry = 0;
 271         switch(errorcode) {
 272                 case 0:
 273                         return 0;
 274                 case -NFS4ERR_OPENMODE:
 275                         if (inode && nfs_have_delegation(inode, FMODE_READ)) {
 276                                 nfs_inode_return_delegation(inode);
 277                                 exception->retry = 1;
 278                                 return 0;
 279                         }
 280                         if (state == NULL)
 281                                 break;
 282                         nfs4_schedule_stateid_recovery(server, state);
 283                         goto wait_on_recovery;
 284                 case -NFS4ERR_DELEG_REVOKED:
 285                 case -NFS4ERR_ADMIN_REVOKED:
 286                 case -NFS4ERR_BAD_STATEID:
 287                         if (state == NULL)
 288                                 break;
 289                         nfs_remove_bad_delegation(state->inode);
 290                         nfs4_schedule_stateid_recovery(server, state);
 291                         goto wait_on_recovery;
 292                 case -NFS4ERR_EXPIRED:
 293                         if (state != NULL)
 294                                 nfs4_schedule_stateid_recovery(server, state);
 295                 case -NFS4ERR_STALE_STATEID:
 296                 case -NFS4ERR_STALE_CLIENTID:
 297                         nfs4_schedule_lease_recovery(clp);
 298                         goto wait_on_recovery;
 299 #if defined(CONFIG_NFS_V4_1)
 300                 case -NFS4ERR_BADSESSION:
 301                 case -NFS4ERR_BADSLOT:
 302                 case -NFS4ERR_BAD_HIGH_SLOT:
 303                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 304                 case -NFS4ERR_DEADSESSION:
 305                 case -NFS4ERR_SEQ_FALSE_RETRY:
 306                 case -NFS4ERR_SEQ_MISORDERED:
 307                         dprintk("%s ERROR: %d Reset session\n", __func__,
 308                                 errorcode);
 309                         nfs4_schedule_session_recovery(clp->cl_session);
 310                         exception->retry = 1;
 311                         break;
 312 #endif /* defined(CONFIG_NFS_V4_1) */
 313                 case -NFS4ERR_FILE_OPEN:
 314                         if (exception->timeout > HZ) {
 315                                 /* We have retried a decent amount, time to
 316                                  * fail
 317                                  */
 318                                 ret = -EBUSY;
 319                                 break;
 320                         }
 321                 case -NFS4ERR_GRACE:
 322                 case -NFS4ERR_DELAY:
 323                 case -EKEYEXPIRED:
 324                         ret = nfs4_delay(server->client, &exception->timeout);
 325                         if (ret != 0)
 326                                 break;
 327                 case -NFS4ERR_RETRY_UNCACHED_REP:
 328                 case -NFS4ERR_OLD_STATEID:
 329                         exception->retry = 1;
 330                         break;
 331                 case -NFS4ERR_BADOWNER:
 332                         /* The following works around a Linux server bug! */
 333                 case -NFS4ERR_BADNAME:
 334                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 335                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 336                                 exception->retry = 1;
 337                                 printk(KERN_WARNING "NFS: v4 server %s "
 338                                                 "does not accept raw "
 339                                                 "uid/gids. "
 340                                                 "Reenabling the idmapper.\n",
 341                                                 server->nfs_client->cl_hostname);
 342                         }
 343         }
 344         /* We failed to handle the error */
 345         return nfs4_map_errors(ret);
 346 wait_on_recovery:
 347         ret = nfs4_wait_clnt_recover(clp);
 348         if (ret == 0)
 349                 exception->retry = 1;
 350         return ret;
 351 }
 352
 353
 354 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 355 {
 356         spin_lock(&clp->cl_lock);
 357         if (time_before(clp->cl_last_renewal,timestamp))
 358                 clp->cl_last_renewal = timestamp;
 359         spin_unlock(&clp->cl_lock);
 360 }
 361
 362 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 363 {
 364         do_renew_lease(server->nfs_client, timestamp);
 365 }
 366
 367 #if defined(CONFIG_NFS_V4_1)
 368
 369 /*
 370  * nfs4_free_slot - free a slot and efficiently update slot table.
 371  *
 372  * freeing a slot is trivially done by clearing its respective bit
 373  * in the bitmap.
 374  * If the freed slotid equals highest_used_slotid we want to update it
 375  * so that the server would be able to size down the slot table if needed,
 376  * otherwise we know that the highest_used_slotid is still in use.
 377  * When updating highest_used_slotid there may be "holes" in the bitmap
 378  * so we need to scan down from highest_used_slotid to 0 looking for the now
 379  * highest slotid in use.
 380  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 381  *
 382  * Must be called while holding tbl->slot_tbl_lock
 383  */
 384 static void
 385 nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
 386 {
 387         BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
 388         /* clear used bit in bitmap */
 389         __clear_bit(slotid, tbl->used_slots);
 390
 391         /* update highest_used_slotid when it is freed */
 392         if (slotid == tbl->highest_used_slotid) {
 393                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 394                 if (slotid < tbl->max_slots)
 395                         tbl->highest_used_slotid = slotid;
 396                 else
 397                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 398         }
 399         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 400                 slotid, tbl->highest_used_slotid);
 401 }
 402
 403 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 404 {
 405         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 406         return true;
 407 }
 408
 409 /*
 410  * Signal state manager thread if session fore channel is drained
 411  */
 412 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 413 {
 414         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 415                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 416                                 nfs4_set_task_privileged, NULL);
 417                 return;
 418         }
 419
 420         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 421                 return;
 422
 423         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 424         complete(&ses->fc_slot_table.complete);
 425 }
 426
 427 /*
 428  * Signal state manager thread if session back channel is drained
 429  */
 430 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 431 {
 432         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 433             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 434                 return;
 435         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 436         complete(&ses->bc_slot_table.complete);
 437 }
 438
 439 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 440 {
 441         struct nfs4_slot_table *tbl;
 442
 443         tbl = &res->sr_session->fc_slot_table;
 444         if (!res->sr_slot) {
 445                 /* just wake up the next guy waiting since
 446                  * we may have not consumed a slot after all */
 447                 dprintk("%s: No slot\n", __func__);
 448                 return;
 449         }
 450
 451         spin_lock(&tbl->slot_tbl_lock);
 452         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 453         nfs4_check_drain_fc_complete(res->sr_session);
 454         spin_unlock(&tbl->slot_tbl_lock);
 455         res->sr_slot = NULL;
 456 }
 457
 458 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 459 {
 460         unsigned long timestamp;
 461         struct nfs_client *clp;
 462
 463         /*
 464          * sr_status remains 1 if an RPC level error occurred. The server
 465          * may or may not have processed the sequence operation..
 466          * Proceed as if the server received and processed the sequence
 467          * operation.
 468          */
 469         if (res->sr_status == 1)
 470                 res->sr_status = NFS_OK;
 471
 472         /* don't increment the sequence number if the task wasn't sent */
 473         if (!RPC_WAS_SENT(task))
 474                 goto out;
 475
 476         /* Check the SEQUENCE operation status */
 477         switch (res->sr_status) {
 478         case 0:
 479                 /* Update the slot's sequence and clientid lease timer */
 480                 ++res->sr_slot->seq_nr;
 481                 timestamp = res->sr_renewal_time;
 482                 clp = res->sr_session->clp;
 483                 do_renew_lease(clp, timestamp);
 484                 /* Check sequence flags */
 485                 if (res->sr_status_flags != 0)
 486                         nfs4_schedule_lease_recovery(clp);
 487                 break;
 488         case -NFS4ERR_DELAY:
 489                 /* The server detected a resend of the RPC call and
 490                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 491                  * of RFC5661.
 492                  */
 493                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 494                         __func__,
 495                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 496                         res->sr_slot->seq_nr);
 497                 goto out_retry;
 498         default:
 499                 /* Just update the slot sequence no. */
 500                 ++res->sr_slot->seq_nr;
 501         }
 502 out:
 503         /* The session may be reset by one of the error handlers. */
 504         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 505         nfs41_sequence_free_slot(res);
 506         return 1;
 507 out_retry:
 508         if (!rpc_restart_call(task))
 509                 goto out;
 510         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 511         return 0;
 512 }
 513
 514 static int nfs4_sequence_done(struct rpc_task *task,
 515                                struct nfs4_sequence_res *res)
 516 {
 517         if (res->sr_session == NULL)
 518                 return 1;
 519         return nfs41_sequence_done(task, res);
 520 }
 521
 522 /*
 523  * nfs4_find_slot - efficiently look for a free slot
 524  *
 525  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 526  * If found, we mark the slot as used, update the highest_used_slotid,
 527  * and respectively set up the sequence operation args.
 528  * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
 529  *
 530  * Note: must be called with under the slot_tbl_lock.
 531  */
 532 static u32
 533 nfs4_find_slot(struct nfs4_slot_table *tbl)
 534 {
 535         u32 slotid;
 536         u32 ret_id = NFS4_NO_SLOT;
 537
 538         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 539                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 540                 tbl->max_slots);
 541         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 542         if (slotid >= tbl->max_slots)
 543                 goto out;
 544         __set_bit(slotid, tbl->used_slots);
 545         if (slotid > tbl->highest_used_slotid ||
 546                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 547                 tbl->highest_used_slotid = slotid;
 548         ret_id = slotid;
 549 out:
 550         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 551                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 552         return ret_id;
 553 }
 554
 555 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 556                 struct nfs4_sequence_res *res, int cache_reply)
 557 {
 558         args->sa_session = NULL;
 559         args->sa_cache_this = 0;
 560         if (cache_reply)
 561                 args->sa_cache_this = 1;
 562         res->sr_session = NULL;
 563         res->sr_slot = NULL;
 564 }
 565
 566 int nfs41_setup_sequence(struct nfs4_session *session,
 567                                 struct nfs4_sequence_args *args,
 568                                 struct nfs4_sequence_res *res,
 569                                 struct rpc_task *task)
 570 {
 571         struct nfs4_slot *slot;
 572         struct nfs4_slot_table *tbl;
 573         u32 slotid;
 574
 575         dprintk("--> %s\n", __func__);
 576         /* slot already allocated? */
 577         if (res->sr_slot != NULL)
 578                 return 0;
 579
 580         tbl = &session->fc_slot_table;
 581
 582         spin_lock(&tbl->slot_tbl_lock);
 583         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 584             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 585                 /* The state manager will wait until the slot table is empty */
 586                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 587                 spin_unlock(&tbl->slot_tbl_lock);
 588                 dprintk("%s session is draining\n", __func__);
 589                 return -EAGAIN;
 590         }
 591
 592         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 593             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 594                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 595                 spin_unlock(&tbl->slot_tbl_lock);
 596                 dprintk("%s enforce FIFO order\n", __func__);
 597                 return -EAGAIN;
 598         }
 599
 600         slotid = nfs4_find_slot(tbl);
 601         if (slotid == NFS4_NO_SLOT) {
 602                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 603                 spin_unlock(&tbl->slot_tbl_lock);
 604                 dprintk("<-- %s: no free slots\n", __func__);
 605                 return -EAGAIN;
 606         }
 607         spin_unlock(&tbl->slot_tbl_lock);
 608
 609         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 610         slot = tbl->slots + slotid;
 611         args->sa_session = session;
 612         args->sa_slotid = slotid;
 613
 614         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 615
 616         res->sr_session = session;
 617         res->sr_slot = slot;
 618         res->sr_renewal_time = jiffies;
 619         res->sr_status_flags = 0;
 620         /*
 621          * sr_status is only set in decode_sequence, and so will remain
 622          * set to 1 if an rpc level failure occurs.
 623          */
 624         res->sr_status = 1;
 625         return 0;
 626 }
 627 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 628
 629 int nfs4_setup_sequence(const struct nfs_server *server,
 630                         struct nfs4_sequence_args *args,
 631                         struct nfs4_sequence_res *res,
 632                         struct rpc_task *task)
 633 {
 634         struct nfs4_session *session = nfs4_get_session(server);
 635         int ret = 0;
 636
 637         if (session == NULL)
 638                 goto out;
 639
 640         dprintk("--> %s clp %p session %p sr_slot %td\n",
 641                 __func__, session->clp, session, res->sr_slot ?
 642                         res->sr_slot - session->fc_slot_table.slots : -1);
 643
 644         ret = nfs41_setup_sequence(session, args, res, task);
 645 out:
 646         dprintk("<-- %s status=%d\n", __func__, ret);
 647         return ret;
 648 }
 649
 650 struct nfs41_call_sync_data {
 651         const struct nfs_server *seq_server;
 652         struct nfs4_sequence_args *seq_args;
 653         struct nfs4_sequence_res *seq_res;
 654 };
 655
 656 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 657 {
 658         struct nfs41_call_sync_data *data = calldata;
 659
 660         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 661
 662         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 663                                 data->seq_res, task))
 664                 return;
 665         rpc_call_start(task);
 666 }
 667
 668 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 669 {
 670         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 671         nfs41_call_sync_prepare(task, calldata);
 672 }
 673
 674 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 675 {
 676         struct nfs41_call_sync_data *data = calldata;
 677
 678         nfs41_sequence_done(task, data->seq_res);
 679 }
 680
 681 static const struct rpc_call_ops nfs41_call_sync_ops = {
 682         .rpc_call_prepare = nfs41_call_sync_prepare,
 683         .rpc_call_done = nfs41_call_sync_done,
 684 };
 685
 686 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 687         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 688         .rpc_call_done = nfs41_call_sync_done,
 689 };
 690
 691 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 692                                    struct nfs_server *server,
 693                                    struct rpc_message *msg,
 694                                    struct nfs4_sequence_args *args,
 695                                    struct nfs4_sequence_res *res,
 696                                    int privileged)
 697 {
 698         int ret;
 699         struct rpc_task *task;
 700         struct nfs41_call_sync_data data = {
 701                 .seq_server = server,
 702                 .seq_args = args,
 703                 .seq_res = res,
 704         };
 705         struct rpc_task_setup task_setup = {
 706                 .rpc_client = clnt,
 707                 .rpc_message = msg,
 708                 .callback_ops = &nfs41_call_sync_ops,
 709                 .callback_data = &data
 710         };
 711
 712         if (privileged)
 713                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 714         task = rpc_run_task(&task_setup);
 715         if (IS_ERR(task))
 716                 ret = PTR_ERR(task);
 717         else {
 718                 ret = task->tk_status;
 719                 rpc_put_task(task);
 720         }
 721         return ret;
 722 }
 723
 724 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 725                             struct nfs_server *server,
 726                             struct rpc_message *msg,
 727                             struct nfs4_sequence_args *args,
 728                             struct nfs4_sequence_res *res,
 729                             int cache_reply)
 730 {
 731         nfs41_init_sequence(args, res, cache_reply);
 732         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 733 }
 734
 735 #else
 736 static inline
 737 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 738                 struct nfs4_sequence_res *res, int cache_reply)
 739 {
 740 }
 741
 742 static int nfs4_sequence_done(struct rpc_task *task,
 743                                struct nfs4_sequence_res *res)
 744 {
 745         return 1;
 746 }
 747 #endif /* CONFIG_NFS_V4_1 */
 748
 749 int _nfs4_call_sync(struct rpc_clnt *clnt,
 750                     struct nfs_server *server,
 751                     struct rpc_message *msg,
 752                     struct nfs4_sequence_args *args,
 753                     struct nfs4_sequence_res *res,
 754                     int cache_reply)
 755 {
 756         nfs41_init_sequence(args, res, cache_reply);
 757         return rpc_call_sync(clnt, msg, 0);
 758 }
 759
 760 static inline
 761 int nfs4_call_sync(struct rpc_clnt *clnt,
 762                    struct nfs_server *server,
 763                    struct rpc_message *msg,
 764                    struct nfs4_sequence_args *args,
 765                    struct nfs4_sequence_res *res,
 766                    int cache_reply)
 767 {
 768         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 769                                                 args, res, cache_reply);
 770 }
 771
 772 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 773 {
 774         struct nfs_inode *nfsi = NFS_I(dir);
 775
 776         spin_lock(&dir->i_lock);
 777         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 778         if (!cinfo->atomic || cinfo->before != dir->i_version)
 779                 nfs_force_lookup_revalidate(dir);
 780         dir->i_version = cinfo->after;
 781         spin_unlock(&dir->i_lock);
 782 }
 783
 784 struct nfs4_opendata {
 785         struct kref kref;
 786         struct nfs_openargs o_arg;
 787         struct nfs_openres o_res;
 788         struct nfs_open_confirmargs c_arg;
 789         struct nfs_open_confirmres c_res;
 790         struct nfs4_string owner_name;
 791         struct nfs4_string group_name;
 792         struct nfs_fattr f_attr;
 793         struct dentry *dir;
 794         struct dentry *dentry;
 795         struct nfs4_state_owner *owner;
 796         struct nfs4_state *state;
 797         struct iattr attrs;
 798         unsigned long timestamp;
 799         unsigned int rpc_done : 1;
 800         int rpc_status;
 801         int cancelled;
 802 };
 803
 804
 805 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 806 {
 807         p->o_res.f_attr = &p->f_attr;
 808         p->o_res.seqid = p->o_arg.seqid;
 809         p->c_res.seqid = p->c_arg.seqid;
 810         p->o_res.server = p->o_arg.server;
 811         nfs_fattr_init(&p->f_attr);
 812         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 813 }
 814
 815 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 816                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 817                 const struct iattr *attrs,
 818                 gfp_t gfp_mask)
 819 {
 820         struct dentry *parent = dget_parent(dentry);
 821         struct inode *dir = parent->d_inode;
 822         struct nfs_server *server = NFS_SERVER(dir);
 823         struct nfs4_opendata *p;
 824
 825         p = kzalloc(sizeof(*p), gfp_mask);
 826         if (p == NULL)
 827                 goto err;
 828         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 829         if (p->o_arg.seqid == NULL)
 830                 goto err_free;
 831         nfs_sb_active(dentry->d_sb);
 832         p->dentry = dget(dentry);
 833         p->dir = parent;
 834         p->owner = sp;
 835         atomic_inc(&sp->so_count);
 836         p->o_arg.fh = NFS_FH(dir);
 837         p->o_arg.open_flags = flags;
 838         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 839         p->o_arg.clientid = server->nfs_client->cl_clientid;
 840         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 841         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 842         p->o_arg.name = &dentry->d_name;
 843         p->o_arg.server = server;
 844         p->o_arg.bitmask = server->attr_bitmask;
 845         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 846         if (attrs != NULL && attrs->ia_valid != 0) {
 847                 __be32 verf[2];
 848
 849                 p->o_arg.u.attrs = &p->attrs;
 850                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 851
 852                 verf[0] = jiffies;
 853                 verf[1] = current->pid;
 854                 memcpy(p->o_arg.u.verifier.data, verf,
 855                                 sizeof(p->o_arg.u.verifier.data));
 856         }
 857         p->c_arg.fh = &p->o_res.fh;
 858         p->c_arg.stateid = &p->o_res.stateid;
 859         p->c_arg.seqid = p->o_arg.seqid;
 860         nfs4_init_opendata_res(p);
 861         kref_init(&p->kref);
 862         return p;
 863 err_free:
 864         kfree(p);
 865 err:
 866         dput(parent);
 867         return NULL;
 868 }
 869
 870 static void nfs4_opendata_free(struct kref *kref)
 871 {
 872         struct nfs4_opendata *p = container_of(kref,
 873                         struct nfs4_opendata, kref);
 874         struct super_block *sb = p->dentry->d_sb;
 875
 876         nfs_free_seqid(p->o_arg.seqid);
 877         if (p->state != NULL)
 878                 nfs4_put_open_state(p->state);
 879         nfs4_put_state_owner(p->owner);
 880         dput(p->dir);
 881         dput(p->dentry);
 882         nfs_sb_deactive(sb);
 883         nfs_fattr_free_names(&p->f_attr);
 884         kfree(p);
 885 }
 886
 887 static void nfs4_opendata_put(struct nfs4_opendata *p)
 888 {
 889         if (p != NULL)
 890                 kref_put(&p->kref, nfs4_opendata_free);
 891 }
 892
 893 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 894 {
 895         int ret;
 896
 897         ret = rpc_wait_for_completion_task(task);
 898         return ret;
 899 }
 900
 901 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 902 {
 903         int ret = 0;
 904
 905         if (open_mode & (O_EXCL|O_TRUNC))
 906                 goto out;
 907         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 908                 case FMODE_READ:
 909                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 910                                 && state->n_rdonly != 0;
 911                         break;
 912                 case FMODE_WRITE:
 913                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 914                                 && state->n_wronly != 0;
 915                         break;
 916                 case FMODE_READ|FMODE_WRITE:
 917                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 918                                 && state->n_rdwr != 0;
 919         }
 920 out:
 921         return ret;
 922 }
 923
 924 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 925 {
 926         if (delegation == NULL)
 927                 return 0;
 928         if ((delegation->type & fmode) != fmode)
 929                 return 0;
 930         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 931                 return 0;
 932         nfs_mark_delegation_referenced(delegation);
 933         return 1;
 934 }
 935
 936 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 937 {
 938         switch (fmode) {
 939                 case FMODE_WRITE:
 940                         state->n_wronly++;
 941                         break;
 942                 case FMODE_READ:
 943                         state->n_rdonly++;
 944                         break;
 945                 case FMODE_READ|FMODE_WRITE:
 946                         state->n_rdwr++;
 947         }
 948         nfs4_state_set_mode_locked(state, state->state | fmode);
 949 }
 950
 951 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 952 {
 953         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 954                 nfs4_stateid_copy(&state->stateid, stateid);
 955         nfs4_stateid_copy(&state->open_stateid, stateid);
 956         switch (fmode) {
 957                 case FMODE_READ:
 958                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 959                         break;
 960                 case FMODE_WRITE:
 961                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 962                         break;
 963                 case FMODE_READ|FMODE_WRITE:
 964                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 965         }
 966 }
 967
 968 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 969 {
 970         write_seqlock(&state->seqlock);
 971         nfs_set_open_stateid_locked(state, stateid, fmode);
 972         write_sequnlock(&state->seqlock);
 973 }
 974
 975 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 976 {
 977         /*
 978          * Protect the call to nfs4_state_set_mode_locked and
 979          * serialise the stateid update
 980          */
 981         write_seqlock(&state->seqlock);
 982         if (deleg_stateid != NULL) {
 983                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 984                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 985         }
 986         if (open_stateid != NULL)
 987                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 988         write_sequnlock(&state->seqlock);
 989         spin_lock(&state->owner->so_lock);
 990         update_open_stateflags(state, fmode);
 991         spin_unlock(&state->owner->so_lock);
 992 }
 993
 994 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 995 {
 996         struct nfs_inode *nfsi = NFS_I(state->inode);
 997         struct nfs_delegation *deleg_cur;
 998         int ret = 0;
 999
1000         fmode &= (FMODE_READ|FMODE_WRITE);
1001
1002         rcu_read_lock();
1003         deleg_cur = rcu_dereference(nfsi->delegation);
1004         if (deleg_cur == NULL)
1005                 goto no_delegation;
1006
1007         spin_lock(&deleg_cur->lock);
1008         if (nfsi->delegation != deleg_cur ||
1009             (deleg_cur->type & fmode) != fmode)
1010                 goto no_delegation_unlock;
1011
1012         if (delegation == NULL)
1013                 delegation = &deleg_cur->stateid;
1014         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1015                 goto no_delegation_unlock;
1016
1017         nfs_mark_delegation_referenced(deleg_cur);
1018         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1019         ret = 1;
1020 no_delegation_unlock:
1021         spin_unlock(&deleg_cur->lock);
1022 no_delegation:
1023         rcu_read_unlock();
1024
1025         if (!ret && open_stateid != NULL) {
1026                 __update_open_stateid(state, open_stateid, NULL, fmode);
1027                 ret = 1;
1028         }
1029
1030         return ret;
1031 }
1032
1033
1034 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1035 {
1036         struct nfs_delegation *delegation;
1037
1038         rcu_read_lock();
1039         delegation = rcu_dereference(NFS_I(inode)->delegation);
1040         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1041                 rcu_read_unlock();
1042                 return;
1043         }
1044         rcu_read_unlock();
1045         nfs_inode_return_delegation(inode);
1046 }
1047
1048 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1049 {
1050         struct nfs4_state *state = opendata->state;
1051         struct nfs_inode *nfsi = NFS_I(state->inode);
1052         struct nfs_delegation *delegation;
1053         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1054         fmode_t fmode = opendata->o_arg.fmode;
1055         nfs4_stateid stateid;
1056         int ret = -EAGAIN;
1057
1058         for (;;) {
1059                 if (can_open_cached(state, fmode, open_mode)) {
1060                         spin_lock(&state->owner->so_lock);
1061                         if (can_open_cached(state, fmode, open_mode)) {
1062                                 update_open_stateflags(state, fmode);
1063                                 spin_unlock(&state->owner->so_lock);
1064                                 goto out_return_state;
1065                         }
1066                         spin_unlock(&state->owner->so_lock);
1067                 }
1068                 rcu_read_lock();
1069                 delegation = rcu_dereference(nfsi->delegation);
1070                 if (!can_open_delegated(delegation, fmode)) {
1071                         rcu_read_unlock();
1072                         break;
1073                 }
1074                 /* Save the delegation */
1075                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1076                 rcu_read_unlock();
1077                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1078                 if (ret != 0)
1079                         goto out;
1080                 ret = -EAGAIN;
1081
1082                 /* Try to update the stateid using the delegation */
1083                 if (update_open_stateid(state, NULL, &stateid, fmode))
1084                         goto out_return_state;
1085         }
1086 out:
1087         return ERR_PTR(ret);
1088 out_return_state:
1089         atomic_inc(&state->count);
1090         return state;
1091 }
1092
1093 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1094 {
1095         struct inode *inode;
1096         struct nfs4_state *state = NULL;
1097         struct nfs_delegation *delegation;
1098         int ret;
1099
1100         if (!data->rpc_done) {
1101                 state = nfs4_try_open_cached(data);
1102                 goto out;
1103         }
1104
1105         ret = -EAGAIN;
1106         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1107                 goto err;
1108         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1109         ret = PTR_ERR(inode);
1110         if (IS_ERR(inode))
1111                 goto err;
1112         ret = -ENOMEM;
1113         state = nfs4_get_open_state(inode, data->owner);
1114         if (state == NULL)
1115                 goto err_put_inode;
1116         if (data->o_res.delegation_type != 0) {
1117                 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1118                 int delegation_flags = 0;
1119
1120                 rcu_read_lock();
1121                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1122                 if (delegation)
1123                         delegation_flags = delegation->flags;
1124                 rcu_read_unlock();
1125                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1126                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1127                                         "returning a delegation for "
1128                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1129                                         clp->cl_hostname);
1130                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1131                         nfs_inode_set_delegation(state->inode,
1132                                         data->owner->so_cred,
1133                                         &data->o_res);
1134                 else
1135                         nfs_inode_reclaim_delegation(state->inode,
1136                                         data->owner->so_cred,
1137                                         &data->o_res);
1138         }
1139
1140         update_open_stateid(state, &data->o_res.stateid, NULL,
1141                         data->o_arg.fmode);
1142         iput(inode);
1143 out:
1144         return state;
1145 err_put_inode:
1146         iput(inode);
1147 err:
1148         return ERR_PTR(ret);
1149 }
1150
1151 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1152 {
1153         struct nfs_inode *nfsi = NFS_I(state->inode);
1154         struct nfs_open_context *ctx;
1155
1156         spin_lock(&state->inode->i_lock);
1157         list_for_each_entry(ctx, &nfsi->open_files, list) {
1158                 if (ctx->state != state)
1159                         continue;
1160                 get_nfs_open_context(ctx);
1161                 spin_unlock(&state->inode->i_lock);
1162                 return ctx;
1163         }
1164         spin_unlock(&state->inode->i_lock);
1165         return ERR_PTR(-ENOENT);
1166 }
1167
1168 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1169 {
1170         struct nfs4_opendata *opendata;
1171
1172         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1173         if (opendata == NULL)
1174                 return ERR_PTR(-ENOMEM);
1175         opendata->state = state;
1176         atomic_inc(&state->count);
1177         return opendata;
1178 }
1179
1180 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1181 {
1182         struct nfs4_state *newstate;
1183         int ret;
1184
1185         opendata->o_arg.open_flags = 0;
1186         opendata->o_arg.fmode = fmode;
1187         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1188         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1189         nfs4_init_opendata_res(opendata);
1190         ret = _nfs4_recover_proc_open(opendata);
1191         if (ret != 0)
1192                 return ret;
1193         newstate = nfs4_opendata_to_nfs4_state(opendata);
1194         if (IS_ERR(newstate))
1195                 return PTR_ERR(newstate);
1196         nfs4_close_state(newstate, fmode);
1197         *res = newstate;
1198         return 0;
1199 }
1200
1201 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1202 {
1203         struct nfs4_state *newstate;
1204         int ret;
1205
1206         /* memory barrier prior to reading state->n_* */
1207         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1208         smp_rmb();
1209         if (state->n_rdwr != 0) {
1210                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1211                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1212                 if (ret != 0)
1213                         return ret;
1214                 if (newstate != state)
1215                         return -ESTALE;
1216         }
1217         if (state->n_wronly != 0) {
1218                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1219                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1220                 if (ret != 0)
1221                         return ret;
1222                 if (newstate != state)
1223                         return -ESTALE;
1224         }
1225         if (state->n_rdonly != 0) {
1226                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1227                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1228                 if (ret != 0)
1229                         return ret;
1230                 if (newstate != state)
1231                         return -ESTALE;
1232         }
1233         /*
1234          * We may have performed cached opens for all three recoveries.
1235          * Check if we need to update the current stateid.
1236          */
1237         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1238             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1239                 write_seqlock(&state->seqlock);
1240                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1241                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1242                 write_sequnlock(&state->seqlock);
1243         }
1244         return 0;
1245 }
1246
1247 /*
1248  * OPEN_RECLAIM:
1249  *      reclaim state on the server after a reboot.
1250  */
1251 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1252 {
1253         struct nfs_delegation *delegation;
1254         struct nfs4_opendata *opendata;
1255         fmode_t delegation_type = 0;
1256         int status;
1257
1258         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1259         if (IS_ERR(opendata))
1260                 return PTR_ERR(opendata);
1261         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1262         opendata->o_arg.fh = NFS_FH(state->inode);
1263         rcu_read_lock();
1264         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1265         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1266                 delegation_type = delegation->type;
1267         rcu_read_unlock();
1268         opendata->o_arg.u.delegation_type = delegation_type;
1269         status = nfs4_open_recover(opendata, state);
1270         nfs4_opendata_put(opendata);
1271         return status;
1272 }
1273
1274 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1275 {
1276         struct nfs_server *server = NFS_SERVER(state->inode);
1277         struct nfs4_exception exception = { };
1278         int err;
1279         do {
1280                 err = _nfs4_do_open_reclaim(ctx, state);
1281                 if (err != -NFS4ERR_DELAY)
1282                         break;
1283                 nfs4_handle_exception(server, err, &exception);
1284         } while (exception.retry);
1285         return err;
1286 }
1287
1288 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1289 {
1290         struct nfs_open_context *ctx;
1291         int ret;
1292
1293         ctx = nfs4_state_find_open_context(state);
1294         if (IS_ERR(ctx))
1295                 return PTR_ERR(ctx);
1296         ret = nfs4_do_open_reclaim(ctx, state);
1297         put_nfs_open_context(ctx);
1298         return ret;
1299 }
1300
1301 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1302 {
1303         struct nfs4_opendata *opendata;
1304         int ret;
1305
1306         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1307         if (IS_ERR(opendata))
1308                 return PTR_ERR(opendata);
1309         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1310         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1311         ret = nfs4_open_recover(opendata, state);
1312         nfs4_opendata_put(opendata);
1313         return ret;
1314 }
1315
1316 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1317 {
1318         struct nfs4_exception exception = { };
1319         struct nfs_server *server = NFS_SERVER(state->inode);
1320         int err;
1321         do {
1322                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1323                 switch (err) {
1324                         case 0:
1325                         case -ENOENT:
1326                         case -ESTALE:
1327                                 goto out;
1328                         case -NFS4ERR_BADSESSION:
1329                         case -NFS4ERR_BADSLOT:
1330                         case -NFS4ERR_BAD_HIGH_SLOT:
1331                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1332                         case -NFS4ERR_DEADSESSION:
1333                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1334                                 goto out;
1335                         case -NFS4ERR_STALE_CLIENTID:
1336                         case -NFS4ERR_STALE_STATEID:
1337                         case -NFS4ERR_EXPIRED:
1338                                 /* Don't recall a delegation if it was lost */
1339                                 nfs4_schedule_lease_recovery(server->nfs_client);
1340                                 goto out;
1341                         case -ERESTARTSYS:
1342                                 /*
1343                                  * The show must go on: exit, but mark the
1344                                  * stateid as needing recovery.
1345                                  */
1346                         case -NFS4ERR_DELEG_REVOKED:
1347                         case -NFS4ERR_ADMIN_REVOKED:
1348                         case -NFS4ERR_BAD_STATEID:
1349                                 nfs_inode_find_state_and_recover(state->inode,
1350                                                 stateid);
1351                                 nfs4_schedule_stateid_recovery(server, state);
1352                         case -EKEYEXPIRED:
1353                                 /*
1354                                  * User RPCSEC_GSS context has expired.
1355                                  * We cannot recover this stateid now, so
1356                                  * skip it and allow recovery thread to
1357                                  * proceed.
1358                                  */
1359                         case -ENOMEM:
1360                                 err = 0;
1361                                 goto out;
1362                 }
1363                 err = nfs4_handle_exception(server, err, &exception);
1364         } while (exception.retry);
1365 out:
1366         return err;
1367 }
1368
1369 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1370 {
1371         struct nfs4_opendata *data = calldata;
1372
1373         data->rpc_status = task->tk_status;
1374         if (data->rpc_status == 0) {
1375                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1376                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1377                 renew_lease(data->o_res.server, data->timestamp);
1378                 data->rpc_done = 1;
1379         }
1380 }
1381
1382 static void nfs4_open_confirm_release(void *calldata)
1383 {
1384         struct nfs4_opendata *data = calldata;
1385         struct nfs4_state *state = NULL;
1386
1387         /* If this request hasn't been cancelled, do nothing */
1388         if (data->cancelled == 0)
1389                 goto out_free;
1390         /* In case of error, no cleanup! */
1391         if (!data->rpc_done)
1392                 goto out_free;
1393         state = nfs4_opendata_to_nfs4_state(data);
1394         if (!IS_ERR(state))
1395                 nfs4_close_state(state, data->o_arg.fmode);
1396 out_free:
1397         nfs4_opendata_put(data);
1398 }
1399
1400 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1401         .rpc_call_done = nfs4_open_confirm_done,
1402         .rpc_release = nfs4_open_confirm_release,
1403 };
1404
1405 /*
1406  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1407  */
1408 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1409 {
1410         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1411         struct rpc_task *task;
1412         struct  rpc_message msg = {
1413                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1414                 .rpc_argp = &data->c_arg,
1415                 .rpc_resp = &data->c_res,
1416                 .rpc_cred = data->owner->so_cred,
1417         };
1418         struct rpc_task_setup task_setup_data = {
1419                 .rpc_client = server->client,
1420                 .rpc_message = &msg,
1421                 .callback_ops = &nfs4_open_confirm_ops,
1422                 .callback_data = data,
1423                 .workqueue = nfsiod_workqueue,
1424                 .flags = RPC_TASK_ASYNC,
1425         };
1426         int status;
1427
1428         kref_get(&data->kref);
1429         data->rpc_done = 0;
1430         data->rpc_status = 0;
1431         data->timestamp = jiffies;
1432         task = rpc_run_task(&task_setup_data);
1433         if (IS_ERR(task))
1434                 return PTR_ERR(task);
1435         status = nfs4_wait_for_completion_rpc_task(task);
1436         if (status != 0) {
1437                 data->cancelled = 1;
1438                 smp_wmb();
1439         } else
1440                 status = data->rpc_status;
1441         rpc_put_task(task);
1442         return status;
1443 }
1444
1445 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1446 {
1447         struct nfs4_opendata *data = calldata;
1448         struct nfs4_state_owner *sp = data->owner;
1449
1450         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1451                 return;
1452         /*
1453          * Check if we still need to send an OPEN call, or if we can use
1454          * a delegation instead.
1455          */
1456         if (data->state != NULL) {
1457                 struct nfs_delegation *delegation;
1458
1459                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1460                         goto out_no_action;
1461                 rcu_read_lock();
1462                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1463                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1464                     can_open_delegated(delegation, data->o_arg.fmode))
1465                         goto unlock_no_action;
1466                 rcu_read_unlock();
1467         }
1468         /* Update client id. */
1469         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1470         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1471                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1472                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1473         }
1474         data->timestamp = jiffies;
1475         if (nfs4_setup_sequence(data->o_arg.server,
1476                                 &data->o_arg.seq_args,
1477                                 &data->o_res.seq_res, task))
1478                 return;
1479         rpc_call_start(task);
1480         return;
1481 unlock_no_action:
1482         rcu_read_unlock();
1483 out_no_action:
1484         task->tk_action = NULL;
1485
1486 }
1487
1488 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1489 {
1490         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1491         nfs4_open_prepare(task, calldata);
1492 }
1493
1494 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1495 {
1496         struct nfs4_opendata *data = calldata;
1497
1498         data->rpc_status = task->tk_status;
1499
1500         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1501                 return;
1502
1503         if (task->tk_status == 0) {
1504                 switch (data->o_res.f_attr->mode & S_IFMT) {
1505                         case S_IFREG:
1506                                 break;
1507                         case S_IFLNK:
1508                                 data->rpc_status = -ELOOP;
1509                                 break;
1510                         case S_IFDIR:
1511                                 data->rpc_status = -EISDIR;
1512                                 break;
1513                         default:
1514                                 data->rpc_status = -ENOTDIR;
1515                 }
1516                 renew_lease(data->o_res.server, data->timestamp);
1517                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1518                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1519         }
1520         data->rpc_done = 1;
1521 }
1522
1523 static void nfs4_open_release(void *calldata)
1524 {
1525         struct nfs4_opendata *data = calldata;
1526         struct nfs4_state *state = NULL;
1527
1528         /* If this request hasn't been cancelled, do nothing */
1529         if (data->cancelled == 0)
1530                 goto out_free;
1531         /* In case of error, no cleanup! */
1532         if (data->rpc_status != 0 || !data->rpc_done)
1533                 goto out_free;
1534         /* In case we need an open_confirm, no cleanup! */
1535         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1536                 goto out_free;
1537         state = nfs4_opendata_to_nfs4_state(data);
1538         if (!IS_ERR(state))
1539                 nfs4_close_state(state, data->o_arg.fmode);
1540 out_free:
1541         nfs4_opendata_put(data);
1542 }
1543
1544 static const struct rpc_call_ops nfs4_open_ops = {
1545         .rpc_call_prepare = nfs4_open_prepare,
1546         .rpc_call_done = nfs4_open_done,
1547         .rpc_release = nfs4_open_release,
1548 };
1549
1550 static const struct rpc_call_ops nfs4_recover_open_ops = {
1551         .rpc_call_prepare = nfs4_recover_open_prepare,
1552         .rpc_call_done = nfs4_open_done,
1553         .rpc_release = nfs4_open_release,
1554 };
1555
1556 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1557 {
1558         struct inode *dir = data->dir->d_inode;
1559         struct nfs_server *server = NFS_SERVER(dir);
1560         struct nfs_openargs *o_arg = &data->o_arg;
1561         struct nfs_openres *o_res = &data->o_res;
1562         struct rpc_task *task;
1563         struct rpc_message msg = {
1564                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1565                 .rpc_argp = o_arg,
1566                 .rpc_resp = o_res,
1567                 .rpc_cred = data->owner->so_cred,
1568         };
1569         struct rpc_task_setup task_setup_data = {
1570                 .rpc_client = server->client,
1571                 .rpc_message = &msg,
1572                 .callback_ops = &nfs4_open_ops,
1573                 .callback_data = data,
1574                 .workqueue = nfsiod_workqueue,
1575                 .flags = RPC_TASK_ASYNC,
1576         };
1577         int status;
1578
1579         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1580         kref_get(&data->kref);
1581         data->rpc_done = 0;
1582         data->rpc_status = 0;
1583         data->cancelled = 0;
1584         if (isrecover)
1585                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1586         task = rpc_run_task(&task_setup_data);
1587         if (IS_ERR(task))
1588                 return PTR_ERR(task);
1589         status = nfs4_wait_for_completion_rpc_task(task);
1590         if (status != 0) {
1591                 data->cancelled = 1;
1592                 smp_wmb();
1593         } else
1594                 status = data->rpc_status;
1595         rpc_put_task(task);
1596
1597         return status;
1598 }
1599
1600 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1601 {
1602         struct inode *dir = data->dir->d_inode;
1603         struct nfs_openres *o_res = &data->o_res;
1604         int status;
1605
1606         status = nfs4_run_open_task(data, 1);
1607         if (status != 0 || !data->rpc_done)
1608                 return status;
1609
1610         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1611
1612         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1613                 status = _nfs4_proc_open_confirm(data);
1614                 if (status != 0)
1615                         return status;
1616         }
1617
1618         return status;
1619 }
1620
1621 /*
1622  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1623  */
1624 static int _nfs4_proc_open(struct nfs4_opendata *data)
1625 {
1626         struct inode *dir = data->dir->d_inode;
1627         struct nfs_server *server = NFS_SERVER(dir);
1628         struct nfs_openargs *o_arg = &data->o_arg;
1629         struct nfs_openres *o_res = &data->o_res;
1630         int status;
1631
1632         status = nfs4_run_open_task(data, 0);
1633         if (!data->rpc_done)
1634                 return status;
1635         if (status != 0) {
1636                 if (status == -NFS4ERR_BADNAME &&
1637                                 !(o_arg->open_flags & O_CREAT))
1638                         return -ENOENT;
1639                 return status;
1640         }
1641
1642         nfs_fattr_map_and_free_names(server, &data->f_attr);
1643
1644         if (o_arg->open_flags & O_CREAT)
1645                 update_changeattr(dir, &o_res->cinfo);
1646         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1647                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1648         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1649                 status = _nfs4_proc_open_confirm(data);
1650                 if (status != 0)
1651                         return status;
1652         }
1653         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1654                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1655         return 0;
1656 }
1657
1658 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1659 {
1660         unsigned int loop;
1661         int ret;
1662
1663         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1664                 ret = nfs4_wait_clnt_recover(clp);
1665                 if (ret != 0)
1666                         break;
1667                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1668                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1669                         break;
1670                 nfs4_schedule_state_manager(clp);
1671                 ret = -EIO;
1672         }
1673         return ret;
1674 }
1675
1676 static int nfs4_recover_expired_lease(struct nfs_server *server)
1677 {
1678         return nfs4_client_recover_expired_lease(server->nfs_client);
1679 }
1680
1681 /*
1682  * OPEN_EXPIRED:
1683  *      reclaim state on the server after a network partition.
1684  *      Assumes caller holds the appropriate lock
1685  */
1686 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1687 {
1688         struct nfs4_opendata *opendata;
1689         int ret;
1690
1691         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1692         if (IS_ERR(opendata))
1693                 return PTR_ERR(opendata);
1694         ret = nfs4_open_recover(opendata, state);
1695         if (ret == -ESTALE)
1696                 d_drop(ctx->dentry);
1697         nfs4_opendata_put(opendata);
1698         return ret;
1699 }
1700
1701 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1702 {
1703         struct nfs_server *server = NFS_SERVER(state->inode);
1704         struct nfs4_exception exception = { };
1705         int err;
1706
1707         do {
1708                 err = _nfs4_open_expired(ctx, state);
1709                 switch (err) {
1710                 default:
1711                         goto out;
1712                 case -NFS4ERR_GRACE:
1713                 case -NFS4ERR_DELAY:
1714                         nfs4_handle_exception(server, err, &exception);
1715                         err = 0;
1716                 }
1717         } while (exception.retry);
1718 out:
1719         return err;
1720 }
1721
1722 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1723 {
1724         struct nfs_open_context *ctx;
1725         int ret;
1726
1727         ctx = nfs4_state_find_open_context(state);
1728         if (IS_ERR(ctx))
1729                 return PTR_ERR(ctx);
1730         ret = nfs4_do_open_expired(ctx, state);
1731         put_nfs_open_context(ctx);
1732         return ret;
1733 }
1734
1735 #if defined(CONFIG_NFS_V4_1)
1736 static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1737 {
1738         int status = NFS_OK;
1739         struct nfs_server *server = NFS_SERVER(state->inode);
1740
1741         if (state->flags & flags) {
1742                 status = nfs41_test_stateid(server, stateid);
1743                 if (status != NFS_OK) {
1744                         nfs41_free_stateid(server, stateid);
1745                         state->flags &= ~flags;
1746                 }
1747         }
1748         return status;
1749 }
1750
1751 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1752 {
1753         int deleg_status, open_status;
1754         int deleg_flags = 1 << NFS_DELEGATED_STATE;
1755         int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1756
1757         deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1758         open_status = nfs41_check_expired_stateid(state,  &state->open_stateid, open_flags);
1759
1760         if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1761                 return NFS_OK;
1762         return nfs4_open_expired(sp, state);
1763 }
1764 #endif
1765
1766 /*
1767  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1768  * fields corresponding to attributes that were used to store the verifier.
1769  * Make sure we clobber those fields in the later setattr call
1770  */
1771 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1772 {
1773         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1774             !(sattr->ia_valid & ATTR_ATIME_SET))
1775                 sattr->ia_valid |= ATTR_ATIME;
1776
1777         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1778             !(sattr->ia_valid & ATTR_MTIME_SET))
1779                 sattr->ia_valid |= ATTR_MTIME;
1780 }
1781
1782 /*
1783  * Returns a referenced nfs4_state
1784  */
1785 static int _nfs4_do_open(struct inode *dir,
1786                         struct dentry *dentry,
1787                         fmode_t fmode,
1788                         int flags,
1789                         struct iattr *sattr,
1790                         struct rpc_cred *cred,
1791                         struct nfs4_state **res,
1792                         struct nfs4_threshold **ctx_th)
1793 {
1794         struct nfs4_state_owner  *sp;
1795         struct nfs4_state     *state = NULL;
1796         struct nfs_server       *server = NFS_SERVER(dir);
1797         struct nfs4_opendata *opendata;
1798         int status;
1799
1800         /* Protect against reboot recovery conflicts */
1801         status = -ENOMEM;
1802         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1803         if (sp == NULL) {
1804                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1805                 goto out_err;
1806         }
1807         status = nfs4_recover_expired_lease(server);
1808         if (status != 0)
1809                 goto err_put_state_owner;
1810         if (dentry->d_inode != NULL)
1811                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1812         status = -ENOMEM;
1813         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1814         if (opendata == NULL)
1815                 goto err_put_state_owner;
1816
1817         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1818                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1819                 if (!opendata->f_attr.mdsthreshold)
1820                         goto err_opendata_put;
1821         }
1822         if (dentry->d_inode != NULL)
1823                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1824
1825         status = _nfs4_proc_open(opendata);
1826         if (status != 0)
1827                 goto err_opendata_put;
1828
1829         state = nfs4_opendata_to_nfs4_state(opendata);
1830         status = PTR_ERR(state);
1831         if (IS_ERR(state))
1832                 goto err_opendata_put;
1833         if (server->caps & NFS_CAP_POSIX_LOCK)
1834                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1835
1836         if (opendata->o_arg.open_flags & O_EXCL) {
1837                 nfs4_exclusive_attrset(opendata, sattr);
1838
1839                 nfs_fattr_init(opendata->o_res.f_attr);
1840                 status = nfs4_do_setattr(state->inode, cred,
1841                                 opendata->o_res.f_attr, sattr,
1842                                 state);
1843                 if (status == 0)
1844                         nfs_setattr_update_inode(state->inode, sattr);
1845                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1846         }
1847
1848         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1849                 *ctx_th = opendata->f_attr.mdsthreshold;
1850         else
1851                 kfree(opendata->f_attr.mdsthreshold);
1852         opendata->f_attr.mdsthreshold = NULL;
1853
1854         nfs4_opendata_put(opendata);
1855         nfs4_put_state_owner(sp);
1856         *res = state;
1857         return 0;
1858 err_opendata_put:
1859         kfree(opendata->f_attr.mdsthreshold);
1860         nfs4_opendata_put(opendata);
1861 err_put_state_owner:
1862         nfs4_put_state_owner(sp);
1863 out_err:
1864         *res = NULL;
1865         return status;
1866 }
1867
1868
1869 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1870                                         struct dentry *dentry,
1871                                         fmode_t fmode,
1872                                         int flags,
1873                                         struct iattr *sattr,
1874                                         struct rpc_cred *cred,
1875                                         struct nfs4_threshold **ctx_th)
1876 {
1877         struct nfs4_exception exception = { };
1878         struct nfs4_state *res;
1879         int status;
1880
1881         do {
1882                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1883                                        &res, ctx_th);
1884                 if (status == 0)
1885                         break;
1886                 /* NOTE: BAD_SEQID means the server and client disagree about the
1887                  * book-keeping w.r.t. state-changing operations
1888                  * (OPEN/CLOSE/LOCK/LOCKU...)
1889                  * It is actually a sign of a bug on the client or on the server.
1890                  *
1891                  * If we receive a BAD_SEQID error in the particular case of
1892                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1893                  * have unhashed the old state_owner for us, and that we can
1894                  * therefore safely retry using a new one. We should still warn
1895                  * the user though...
1896                  */
1897                 if (status == -NFS4ERR_BAD_SEQID) {
1898                         pr_warn_ratelimited("NFS: v4 server %s "
1899                                         " returned a bad sequence-id error!\n",
1900                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1901                         exception.retry = 1;
1902                         continue;
1903                 }
1904                 /*
1905                  * BAD_STATEID on OPEN means that the server cancelled our
1906                  * state before it received the OPEN_CONFIRM.
1907                  * Recover by retrying the request as per the discussion
1908                  * on Page 181 of RFC3530.
1909                  */
1910                 if (status == -NFS4ERR_BAD_STATEID) {
1911                         exception.retry = 1;
1912                         continue;
1913                 }
1914                 if (status == -EAGAIN) {
1915                         /* We must have found a delegation */
1916                         exception.retry = 1;
1917                         continue;
1918                 }
1919                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1920                                         status, &exception));
1921         } while (exception.retry);
1922         return res;
1923 }
1924
1925 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1926                             struct nfs_fattr *fattr, struct iattr *sattr,
1927                             struct nfs4_state *state)
1928 {
1929         struct nfs_server *server = NFS_SERVER(inode);
1930         struct nfs_setattrargs  arg = {
1931                 .fh             = NFS_FH(inode),
1932                 .iap            = sattr,
1933                 .server         = server,
1934                 .bitmask = server->attr_bitmask,
1935         };
1936         struct nfs_setattrres  res = {
1937                 .fattr          = fattr,
1938                 .server         = server,
1939         };
1940         struct rpc_message msg = {
1941                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1942                 .rpc_argp       = &arg,
1943                 .rpc_resp       = &res,
1944                 .rpc_cred       = cred,
1945         };
1946         unsigned long timestamp = jiffies;
1947         int status;
1948
1949         nfs_fattr_init(fattr);
1950
1951         if (state != NULL) {
1952                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1953                                 current->files, current->tgid);
1954         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1955                                 FMODE_WRITE)) {
1956                 /* Use that stateid */
1957         } else
1958                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1959
1960         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1961         if (status == 0 && state != NULL)
1962                 renew_lease(server, timestamp);
1963         return status;
1964 }
1965
1966 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1967                            struct nfs_fattr *fattr, struct iattr *sattr,
1968                            struct nfs4_state *state)
1969 {
1970         struct nfs_server *server = NFS_SERVER(inode);
1971         struct nfs4_exception exception = {
1972                 .state = state,
1973                 .inode = inode,
1974         };
1975         int err;
1976         do {
1977                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
1978                 switch (err) {
1979                 case -NFS4ERR_OPENMODE:
1980                         if (state && !(state->state & FMODE_WRITE)) {
1981                                 err = -EBADF;
1982                                 if (sattr->ia_valid & ATTR_OPEN)
1983                                         err = -EACCES;
1984                                 goto out;
1985                         }
1986                 }
1987                 err = nfs4_handle_exception(server, err, &exception);
1988         } while (exception.retry);
1989 out:
1990         return err;
1991 }
1992
1993 struct nfs4_closedata {
1994         struct inode *inode;
1995         struct nfs4_state *state;
1996         struct nfs_closeargs arg;
1997         struct nfs_closeres res;
1998         struct nfs_fattr fattr;
1999         unsigned long timestamp;
2000         bool roc;
2001         u32 roc_barrier;
2002 };
2003
2004 static void nfs4_free_closedata(void *data)
2005 {
2006         struct nfs4_closedata *calldata = data;
2007         struct nfs4_state_owner *sp = calldata->state->owner;
2008         struct super_block *sb = calldata->state->inode->i_sb;
2009
2010         if (calldata->roc)
2011                 pnfs_roc_release(calldata->state->inode);
2012         nfs4_put_open_state(calldata->state);
2013         nfs_free_seqid(calldata->arg.seqid);
2014         nfs4_put_state_owner(sp);
2015         nfs_sb_deactive(sb);
2016         kfree(calldata);
2017 }
2018
2019 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2020                 fmode_t fmode)
2021 {
2022         spin_lock(&state->owner->so_lock);
2023         if (!(fmode & FMODE_READ))
2024                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2025         if (!(fmode & FMODE_WRITE))
2026                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2027         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2028         spin_unlock(&state->owner->so_lock);
2029 }
2030
2031 static void nfs4_close_done(struct rpc_task *task, void *data)
2032 {
2033         struct nfs4_closedata *calldata = data;
2034         struct nfs4_state *state = calldata->state;
2035         struct nfs_server *server = NFS_SERVER(calldata->inode);
2036
2037         dprintk("%s: begin!\n", __func__);
2038         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2039                 return;
2040         /* hmm. we are done with the inode, and in the process of freeing
2041          * the state_owner. we keep this around to process errors
2042          */
2043         switch (task->tk_status) {
2044                 case 0:
2045                         if (calldata->roc)
2046                                 pnfs_roc_set_barrier(state->inode,
2047                                                      calldata->roc_barrier);
2048                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2049                         renew_lease(server, calldata->timestamp);
2050                         nfs4_close_clear_stateid_flags(state,
2051                                         calldata->arg.fmode);
2052                         break;
2053                 case -NFS4ERR_STALE_STATEID:
2054                 case -NFS4ERR_OLD_STATEID:
2055                 case -NFS4ERR_BAD_STATEID:
2056                 case -NFS4ERR_EXPIRED:
2057                         if (calldata->arg.fmode == 0)
2058                                 break;
2059                 default:
2060                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2061                                 rpc_restart_call_prepare(task);
2062         }
2063         nfs_release_seqid(calldata->arg.seqid);
2064         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2065         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2066 }
2067
2068 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2069 {
2070         struct nfs4_closedata *calldata = data;
2071         struct nfs4_state *state = calldata->state;
2072         int call_close = 0;
2073
2074         dprintk("%s: begin!\n", __func__);
2075         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2076                 return;
2077
2078         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2079         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2080         spin_lock(&state->owner->so_lock);
2081         /* Calculate the change in open mode */
2082         if (state->n_rdwr == 0) {
2083                 if (state->n_rdonly == 0) {
2084                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2085                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2086                         calldata->arg.fmode &= ~FMODE_READ;
2087                 }
2088                 if (state->n_wronly == 0) {
2089                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2090                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2091                         calldata->arg.fmode &= ~FMODE_WRITE;
2092                 }
2093         }
2094         spin_unlock(&state->owner->so_lock);
2095
2096         if (!call_close) {
2097                 /* Note: exit _without_ calling nfs4_close_done */
2098                 task->tk_action = NULL;
2099                 goto out;
2100         }
2101
2102         if (calldata->arg.fmode == 0) {
2103                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2104                 if (calldata->roc &&
2105                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2106                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2107                                      task, NULL);
2108                         goto out;
2109                 }
2110         }
2111
2112         nfs_fattr_init(calldata->res.fattr);
2113         calldata->timestamp = jiffies;
2114         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2115                                 &calldata->arg.seq_args,
2116                                 &calldata->res.seq_res,
2117                                 task))
2118                 goto out;
2119         rpc_call_start(task);
2120 out:
2121         dprintk("%s: done!\n", __func__);
2122 }
2123
2124 static const struct rpc_call_ops nfs4_close_ops = {
2125         .rpc_call_prepare = nfs4_close_prepare,
2126         .rpc_call_done = nfs4_close_done,
2127         .rpc_release = nfs4_free_closedata,
2128 };
2129
2130 /*
2131  * It is possible for data to be read/written from a mem-mapped file
2132  * after the sys_close call (which hits the vfs layer as a flush).
2133  * This means that we can't safely call nfsv4 close on a file until
2134  * the inode is cleared. This in turn means that we are not good
2135  * NFSv4 citizens - we do not indicate to the server to update the file's
2136  * share state even when we are done with one of the three share
2137  * stateid's in the inode.
2138  *
2139  * NOTE: Caller must be holding the sp->so_owner semaphore!
2140  */
2141 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2142 {
2143         struct nfs_server *server = NFS_SERVER(state->inode);
2144         struct nfs4_closedata *calldata;
2145         struct nfs4_state_owner *sp = state->owner;
2146         struct rpc_task *task;
2147         struct rpc_message msg = {
2148                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2149                 .rpc_cred = state->owner->so_cred,
2150         };
2151         struct rpc_task_setup task_setup_data = {
2152                 .rpc_client = server->client,
2153                 .rpc_message = &msg,
2154                 .callback_ops = &nfs4_close_ops,
2155                 .workqueue = nfsiod_workqueue,
2156                 .flags = RPC_TASK_ASYNC,
2157         };
2158         int status = -ENOMEM;
2159
2160         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2161         if (calldata == NULL)
2162                 goto out;
2163         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2164         calldata->inode = state->inode;
2165         calldata->state = state;
2166         calldata->arg.fh = NFS_FH(state->inode);
2167         calldata->arg.stateid = &state->open_stateid;
2168         /* Serialization for the sequence id */
2169         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2170         if (calldata->arg.seqid == NULL)
2171                 goto out_free_calldata;
2172         calldata->arg.fmode = 0;
2173         calldata->arg.bitmask = server->cache_consistency_bitmask;
2174         calldata->res.fattr = &calldata->fattr;
2175         calldata->res.seqid = calldata->arg.seqid;
2176         calldata->res.server = server;
2177         calldata->roc = roc;
2178         nfs_sb_active(calldata->inode->i_sb);
2179
2180         msg.rpc_argp = &calldata->arg;
2181         msg.rpc_resp = &calldata->res;
2182         task_setup_data.callback_data = calldata;
2183         task = rpc_run_task(&task_setup_data);
2184         if (IS_ERR(task))
2185                 return PTR_ERR(task);
2186         status = 0;
2187         if (wait)
2188                 status = rpc_wait_for_completion_task(task);
2189         rpc_put_task(task);
2190         return status;
2191 out_free_calldata:
2192         kfree(calldata);
2193 out:
2194         if (roc)
2195                 pnfs_roc_release(state->inode);
2196         nfs4_put_open_state(state);
2197         nfs4_put_state_owner(sp);
2198         return status;
2199 }
2200
2201 static struct inode *
2202 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2203 {
2204         struct nfs4_state *state;
2205
2206         /* Protect against concurrent sillydeletes */
2207         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2208                              ctx->cred, &ctx->mdsthreshold);
2209         if (IS_ERR(state))
2210                 return ERR_CAST(state);
2211         ctx->state = state;
2212         return igrab(state->inode);
2213 }
2214
2215 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2216 {
2217         if (ctx->state == NULL)
2218                 return;
2219         if (is_sync)
2220                 nfs4_close_sync(ctx->state, ctx->mode);
2221         else
2222                 nfs4_close_state(ctx->state, ctx->mode);
2223 }
2224
2225 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2226 {
2227         struct nfs4_server_caps_arg args = {
2228                 .fhandle = fhandle,
2229         };
2230         struct nfs4_server_caps_res res = {};
2231         struct rpc_message msg = {
2232                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2233                 .rpc_argp = &args,
2234                 .rpc_resp = &res,
2235         };
2236         int status;
2237
2238         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2239         if (status == 0) {
2240                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2241                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2242                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2243                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2244                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2245                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2246                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2247                         server->caps |= NFS_CAP_ACLS;
2248                 if (res.has_links != 0)
2249                         server->caps |= NFS_CAP_HARDLINKS;
2250                 if (res.has_symlinks != 0)
2251                         server->caps |= NFS_CAP_SYMLINKS;
2252                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2253                         server->caps |= NFS_CAP_FILEID;
2254                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2255                         server->caps |= NFS_CAP_MODE;
2256                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2257                         server->caps |= NFS_CAP_NLINK;
2258                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2259                         server->caps |= NFS_CAP_OWNER;
2260                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2261                         server->caps |= NFS_CAP_OWNER_GROUP;
2262                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2263                         server->caps |= NFS_CAP_ATIME;
2264                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2265                         server->caps |= NFS_CAP_CTIME;
2266                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2267                         server->caps |= NFS_CAP_MTIME;
2268
2269                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2270                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2271                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2272                 server->acl_bitmask = res.acl_bitmask;
2273                 server->fh_expire_type = res.fh_expire_type;
2274         }
2275
2276         return status;
2277 }
2278
2279 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2280 {
2281         struct nfs4_exception exception = { };
2282         int err;
2283         do {
2284                 err = nfs4_handle_exception(server,
2285                                 _nfs4_server_capabilities(server, fhandle),
2286                                 &exception);
2287         } while (exception.retry);
2288         return err;
2289 }
2290
2291 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2292                 struct nfs_fsinfo *info)
2293 {
2294         struct nfs4_lookup_root_arg args = {
2295                 .bitmask = nfs4_fattr_bitmap,
2296         };
2297         struct nfs4_lookup_res res = {
2298                 .server = server,
2299                 .fattr = info->fattr,
2300                 .fh = fhandle,
2301         };
2302         struct rpc_message msg = {
2303                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2304                 .rpc_argp = &args,
2305                 .rpc_resp = &res,
2306         };
2307
2308         nfs_fattr_init(info->fattr);
2309         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2310 }
2311
2312 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2313                 struct nfs_fsinfo *info)
2314 {
2315         struct nfs4_exception exception = { };
2316         int err;
2317         do {
2318                 err = _nfs4_lookup_root(server, fhandle, info);
2319                 switch (err) {
2320                 case 0:
2321                 case -NFS4ERR_WRONGSEC:
2322                         goto out;
2323                 default:
2324                         err = nfs4_handle_exception(server, err, &exception);
2325                 }
2326         } while (exception.retry);
2327 out:
2328         return err;
2329 }
2330
2331 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2332                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2333 {
2334         struct rpc_auth *auth;
2335         int ret;
2336
2337         auth = rpcauth_create(flavor, server->client);
2338         if (!auth) {
2339                 ret = -EIO;
2340                 goto out;
2341         }
2342         ret = nfs4_lookup_root(server, fhandle, info);
2343 out:
2344         return ret;
2345 }
2346
2347 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2348                               struct nfs_fsinfo *info)
2349 {
2350         int i, len, status = 0;
2351         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2352
2353         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2354         flav_array[len] = RPC_AUTH_NULL;
2355         len += 1;
2356
2357         for (i = 0; i < len; i++) {
2358                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2359                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2360                         continue;
2361                 break;
2362         }
2363         /*
2364          * -EACCESS could mean that the user doesn't have correct permissions
2365          * to access the mount.  It could also mean that we tried to mount
2366          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2367          * existing mount programs don't handle -EACCES very well so it should
2368          * be mapped to -EPERM instead.
2369          */
2370         if (status == -EACCES)
2371                 status = -EPERM;
2372         return status;
2373 }
2374
2375 /*
2376  * get the file handle for the "/" directory on the server
2377  */
2378 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2379                          struct nfs_fsinfo *info)
2380 {
2381         int minor_version = server->nfs_client->cl_minorversion;
2382         int status = nfs4_lookup_root(server, fhandle, info);
2383         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2384                 /*
2385                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2386                  * by nfs4_map_errors() as this function exits.
2387                  */
2388                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2389         if (status == 0)
2390                 status = nfs4_server_capabilities(server, fhandle);
2391         if (status == 0)
2392                 status = nfs4_do_fsinfo(server, fhandle, info);
2393         return nfs4_map_errors(status);
2394 }
2395
2396 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2397                               struct nfs_fsinfo *info)
2398 {
2399         int error;
2400         struct nfs_fattr *fattr = info->fattr;
2401
2402         error = nfs4_server_capabilities(server, mntfh);
2403         if (error < 0) {
2404                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2405                 return error;
2406         }
2407
2408         error = nfs4_proc_getattr(server, mntfh, fattr);
2409         if (error < 0) {
2410                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2411                 return error;
2412         }
2413
2414         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2415             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2416                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2417
2418         return error;
2419 }
2420
2421 /*
2422  * Get locations and (maybe) other attributes of a referral.
2423  * Note that we'll actually follow the referral later when
2424  * we detect fsid mismatch in inode revalidation
2425  */
2426 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2427                              const struct qstr *name, struct nfs_fattr *fattr,
2428                              struct nfs_fh *fhandle)
2429 {
2430         int status = -ENOMEM;
2431         struct page *page = NULL;
2432         struct nfs4_fs_locations *locations = NULL;
2433
2434         page = alloc_page(GFP_KERNEL);
2435         if (page == NULL)
2436                 goto out;
2437         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2438         if (locations == NULL)
2439                 goto out;
2440
2441         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2442         if (status != 0)
2443                 goto out;
2444         /* Make sure server returned a different fsid for the referral */
2445         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2446                 dprintk("%s: server did not return a different fsid for"
2447                         " a referral at %s\n", __func__, name->name);
2448                 status = -EIO;
2449                 goto out;
2450         }
2451         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2452         nfs_fixup_referral_attributes(&locations->fattr);
2453
2454         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2455         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2456         memset(fhandle, 0, sizeof(struct nfs_fh));
2457 out:
2458         if (page)
2459                 __free_page(page);
2460         kfree(locations);
2461         return status;
2462 }
2463
2464 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2465 {
2466         struct nfs4_getattr_arg args = {
2467                 .fh = fhandle,
2468                 .bitmask = server->attr_bitmask,
2469         };
2470         struct nfs4_getattr_res res = {
2471                 .fattr = fattr,
2472                 .server = server,
2473         };
2474         struct rpc_message msg = {
2475                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2476                 .rpc_argp = &args,
2477                 .rpc_resp = &res,
2478         };
2479
2480         nfs_fattr_init(fattr);
2481         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2482 }
2483
2484 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2485 {
2486         struct nfs4_exception exception = { };
2487         int err;
2488         do {
2489                 err = nfs4_handle_exception(server,
2490                                 _nfs4_proc_getattr(server, fhandle, fattr),
2491                                 &exception);
2492         } while (exception.retry);
2493         return err;
2494 }
2495
2496 /*
2497  * The file is not closed if it is opened due to the a request to change
2498  * the size of the file. The open call will not be needed once the
2499  * VFS layer lookup-intents are implemented.
2500  *
2501  * Close is called when the inode is destroyed.
2502  * If we haven't opened the file for O_WRONLY, we
2503  * need to in the size_change case to obtain a stateid.
2504  *
2505  * Got race?
2506  * Because OPEN is always done by name in nfsv4, it is
2507  * possible that we opened a different file by the same
2508  * name.  We can recognize this race condition, but we
2509  * can't do anything about it besides returning an error.
2510  *
2511  * This will be fixed with VFS changes (lookup-intent).
2512  */
2513 static int
2514 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2515                   struct iattr *sattr)
2516 {
2517         struct inode *inode = dentry->d_inode;
2518         struct rpc_cred *cred = NULL;
2519         struct nfs4_state *state = NULL;
2520         int status;
2521
2522         if (pnfs_ld_layoutret_on_setattr(inode))
2523                 pnfs_return_layout(inode);
2524
2525         nfs_fattr_init(fattr);
2526
2527         /* Search for an existing open(O_WRITE) file */
2528         if (sattr->ia_valid & ATTR_FILE) {
2529                 struct nfs_open_context *ctx;
2530
2531                 ctx = nfs_file_open_context(sattr->ia_file);
2532                 if (ctx) {
2533                         cred = ctx->cred;
2534                         state = ctx->state;
2535                 }
2536         }
2537
2538         /* Deal with open(O_TRUNC) */
2539         if (sattr->ia_valid & ATTR_OPEN)
2540                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2541
2542         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2543         if (status == 0)
2544                 nfs_setattr_update_inode(inode, sattr);
2545         return status;
2546 }
2547
2548 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2549                 const struct qstr *name, struct nfs_fh *fhandle,
2550                 struct nfs_fattr *fattr)
2551 {
2552         struct nfs_server *server = NFS_SERVER(dir);
2553         int                    status;
2554         struct nfs4_lookup_arg args = {
2555                 .bitmask = server->attr_bitmask,
2556                 .dir_fh = NFS_FH(dir),
2557                 .name = name,
2558         };
2559         struct nfs4_lookup_res res = {
2560                 .server = server,
2561                 .fattr = fattr,
2562                 .fh = fhandle,
2563         };
2564         struct rpc_message msg = {
2565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2566                 .rpc_argp = &args,
2567                 .rpc_resp = &res,
2568         };
2569
2570         nfs_fattr_init(fattr);
2571
2572         dprintk("NFS call  lookup %s\n", name->name);
2573         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2574         dprintk("NFS reply lookup: %d\n", status);
2575         return status;
2576 }
2577
2578 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2579 {
2580         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2581                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2582         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2583         fattr->nlink = 2;
2584 }
2585
2586 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2587                                    struct qstr *name, struct nfs_fh *fhandle,
2588                                    struct nfs_fattr *fattr)
2589 {
2590         struct nfs4_exception exception = { };
2591         struct rpc_clnt *client = *clnt;
2592         int err;
2593         do {
2594                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2595                 switch (err) {
2596                 case -NFS4ERR_BADNAME:
2597                         err = -ENOENT;
2598                         goto out;
2599                 case -NFS4ERR_MOVED:
2600                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2601                         goto out;
2602                 case -NFS4ERR_WRONGSEC:
2603                         err = -EPERM;
2604                         if (client != *clnt)
2605                                 goto out;
2606
2607                         client = nfs4_create_sec_client(client, dir, name);
2608                         if (IS_ERR(client))
2609                                 return PTR_ERR(client);
2610
2611                         exception.retry = 1;
2612                         break;
2613                 default:
2614                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2615                 }
2616         } while (exception.retry);
2617
2618 out:
2619         if (err == 0)
2620                 *clnt = client;
2621         else if (client != *clnt)
2622                 rpc_shutdown_client(client);
2623
2624         return err;
2625 }
2626
2627 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2628                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2629 {
2630         int status;
2631         struct rpc_clnt *client = NFS_CLIENT(dir);
2632
2633         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2634         if (client != NFS_CLIENT(dir)) {
2635                 rpc_shutdown_client(client);
2636                 nfs_fixup_secinfo_attributes(fattr);
2637         }
2638         return status;
2639 }
2640
2641 struct rpc_clnt *
2642 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2643                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2644 {
2645         int status;
2646         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2647
2648         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2649         if (status < 0) {
2650                 rpc_shutdown_client(client);
2651                 return ERR_PTR(status);
2652         }
2653         return client;
2654 }
2655
2656 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2657 {
2658         struct nfs_server *server = NFS_SERVER(inode);
2659         struct nfs4_accessargs args = {
2660                 .fh = NFS_FH(inode),
2661                 .bitmask = server->cache_consistency_bitmask,
2662         };
2663         struct nfs4_accessres res = {
2664                 .server = server,
2665         };
2666         struct rpc_message msg = {
2667                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2668                 .rpc_argp = &args,
2669                 .rpc_resp = &res,
2670                 .rpc_cred = entry->cred,
2671         };
2672         int mode = entry->mask;
2673         int status;
2674
2675         /*
2676          * Determine which access bits we want to ask for...
2677          */
2678         if (mode & MAY_READ)
2679                 args.access |= NFS4_ACCESS_READ;
2680         if (S_ISDIR(inode->i_mode)) {
2681                 if (mode & MAY_WRITE)
2682                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2683                 if (mode & MAY_EXEC)
2684                         args.access |= NFS4_ACCESS_LOOKUP;
2685         } else {
2686                 if (mode & MAY_WRITE)
2687                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2688                 if (mode & MAY_EXEC)
2689                         args.access |= NFS4_ACCESS_EXECUTE;
2690         }
2691
2692         res.fattr = nfs_alloc_fattr();
2693         if (res.fattr == NULL)
2694                 return -ENOMEM;
2695
2696         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2697         if (!status) {
2698                 entry->mask = 0;
2699                 if (res.access & NFS4_ACCESS_READ)
2700                         entry->mask |= MAY_READ;
2701                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2702                         entry->mask |= MAY_WRITE;
2703                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2704                         entry->mask |= MAY_EXEC;
2705                 nfs_refresh_inode(inode, res.fattr);
2706         }
2707         nfs_free_fattr(res.fattr);
2708         return status;
2709 }
2710
2711 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2712 {
2713         struct nfs4_exception exception = { };
2714         int err;
2715         do {
2716                 err = nfs4_handle_exception(NFS_SERVER(inode),
2717                                 _nfs4_proc_access(inode, entry),
2718                                 &exception);
2719         } while (exception.retry);
2720         return err;
2721 }
2722
2723 /*
2724  * TODO: For the time being, we don't try to get any attributes
2725  * along with any of the zero-copy operations READ, READDIR,
2726  * READLINK, WRITE.
2727  *
2728  * In the case of the first three, we want to put the GETATTR
2729  * after the read-type operation -- this is because it is hard
2730  * to predict the length of a GETATTR response in v4, and thus
2731  * align the READ data correctly.  This means that the GETATTR
2732  * may end up partially falling into the page cache, and we should
2733  * shift it into the 'tail' of the xdr_buf before processing.
2734  * To do this efficiently, we need to know the total length
2735  * of data received, which doesn't seem to be available outside
2736  * of the RPC layer.
2737  *
2738  * In the case of WRITE, we also want to put the GETATTR after
2739  * the operation -- in this case because we want to make sure
2740  * we get the post-operation mtime and size.  This means that
2741  * we can't use xdr_encode_pages() as written: we need a variant
2742  * of it which would leave room in the 'tail' iovec.
2743  *
2744  * Both of these changes to the XDR layer would in fact be quite
2745  * minor, but I decided to leave them for a subsequent patch.
2746  */
2747 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2748                 unsigned int pgbase, unsigned int pglen)
2749 {
2750         struct nfs4_readlink args = {
2751                 .fh       = NFS_FH(inode),
2752                 .pgbase   = pgbase,
2753                 .pglen    = pglen,
2754                 .pages    = &page,
2755         };
2756         struct nfs4_readlink_res res;
2757         struct rpc_message msg = {
2758                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2759                 .rpc_argp = &args,
2760                 .rpc_resp = &res,
2761         };
2762
2763         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2764 }
2765
2766 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2767                 unsigned int pgbase, unsigned int pglen)
2768 {
2769         struct nfs4_exception exception = { };
2770         int err;
2771         do {
2772                 err = nfs4_handle_exception(NFS_SERVER(inode),
2773                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2774                                 &exception);
2775         } while (exception.retry);
2776         return err;
2777 }
2778
2779 /*
2780  * Got race?
2781  * We will need to arrange for the VFS layer to provide an atomic open.
2782  * Until then, this create/open method is prone to inefficiency and race
2783  * conditions due to the lookup, create, and open VFS calls from sys_open()
2784  * placed on the wire.
2785  *
2786  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2787  * The file will be opened again in the subsequent VFS open call
2788  * (nfs4_proc_file_open).
2789  *
2790  * The open for read will just hang around to be used by any process that
2791  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2792  */
2793
2794 static int
2795 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2796                  int flags, struct nfs_open_context *ctx)
2797 {
2798         struct dentry *de = dentry;
2799         struct nfs4_state *state;
2800         struct rpc_cred *cred = NULL;
2801         fmode_t fmode = 0;
2802         int status = 0;
2803
2804         if (ctx != NULL) {
2805                 cred = ctx->cred;
2806                 de = ctx->dentry;
2807                 fmode = ctx->mode;
2808         }
2809         sattr->ia_mode &= ~current_umask();
2810         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred, NULL);
2811         d_drop(dentry);
2812         if (IS_ERR(state)) {
2813                 status = PTR_ERR(state);
2814                 goto out;
2815         }
2816         d_add(dentry, igrab(state->inode));
2817         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2818         if (ctx != NULL)
2819                 ctx->state = state;
2820         else
2821                 nfs4_close_sync(state, fmode);
2822 out:
2823         return status;
2824 }
2825
2826 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2827 {
2828         struct nfs_server *server = NFS_SERVER(dir);
2829         struct nfs_removeargs args = {
2830                 .fh = NFS_FH(dir),
2831                 .name.len = name->len,
2832                 .name.name = name->name,
2833         };
2834         struct nfs_removeres res = {
2835                 .server = server,
2836         };
2837         struct rpc_message msg = {
2838                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2839                 .rpc_argp = &args,
2840                 .rpc_resp = &res,
2841         };
2842         int status;
2843
2844         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2845         if (status == 0)
2846                 update_changeattr(dir, &res.cinfo);
2847         return status;
2848 }
2849
2850 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2851 {
2852         struct nfs4_exception exception = { };
2853         int err;
2854         do {
2855                 err = nfs4_handle_exception(NFS_SERVER(dir),
2856                                 _nfs4_proc_remove(dir, name),
2857                                 &exception);
2858         } while (exception.retry);
2859         return err;
2860 }
2861
2862 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2863 {
2864         struct nfs_server *server = NFS_SERVER(dir);
2865         struct nfs_removeargs *args = msg->rpc_argp;
2866         struct nfs_removeres *res = msg->rpc_resp;
2867
2868         res->server = server;
2869         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2870         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2871 }
2872
2873 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2874 {
2875         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2876                                 &data->args.seq_args,
2877                                 &data->res.seq_res,
2878                                 task))
2879                 return;
2880         rpc_call_start(task);
2881 }
2882
2883 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2884 {
2885         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2886
2887         if (!nfs4_sequence_done(task, &res->seq_res))
2888                 return 0;
2889         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2890                 return 0;
2891         update_changeattr(dir, &res->cinfo);
2892         return 1;
2893 }
2894
2895 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2896 {
2897         struct nfs_server *server = NFS_SERVER(dir);
2898         struct nfs_renameargs *arg = msg->rpc_argp;
2899         struct nfs_renameres *res = msg->rpc_resp;
2900
2901         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2902         res->server = server;
2903         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2904 }
2905
2906 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2907 {
2908         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2909                                 &data->args.seq_args,
2910                                 &data->res.seq_res,
2911                                 task))
2912                 return;
2913         rpc_call_start(task);
2914 }
2915
2916 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2917                                  struct inode *new_dir)
2918 {
2919         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2920
2921         if (!nfs4_sequence_done(task, &res->seq_res))
2922                 return 0;
2923         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2924                 return 0;
2925
2926         update_changeattr(old_dir, &res->old_cinfo);
2927         update_changeattr(new_dir, &res->new_cinfo);
2928         return 1;
2929 }
2930
2931 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2932                 struct inode *new_dir, struct qstr *new_name)
2933 {
2934         struct nfs_server *server = NFS_SERVER(old_dir);
2935         struct nfs_renameargs arg = {
2936                 .old_dir = NFS_FH(old_dir),
2937                 .new_dir = NFS_FH(new_dir),
2938                 .old_name = old_name,
2939                 .new_name = new_name,
2940         };
2941         struct nfs_renameres res = {
2942                 .server = server,
2943         };
2944         struct rpc_message msg = {
2945                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2946                 .rpc_argp = &arg,
2947                 .rpc_resp = &res,
2948         };
2949         int status = -ENOMEM;
2950
2951         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2952         if (!status) {
2953                 update_changeattr(old_dir, &res.old_cinfo);
2954                 update_changeattr(new_dir, &res.new_cinfo);
2955         }
2956         return status;
2957 }
2958
2959 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2960                 struct inode *new_dir, struct qstr *new_name)
2961 {
2962         struct nfs4_exception exception = { };
2963         int err;
2964         do {
2965                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2966                                 _nfs4_proc_rename(old_dir, old_name,
2967                                         new_dir, new_name),
2968                                 &exception);
2969         } while (exception.retry);
2970         return err;
2971 }
2972
2973 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2974 {
2975         struct nfs_server *server = NFS_SERVER(inode);
2976         struct nfs4_link_arg arg = {
2977                 .fh     = NFS_FH(inode),
2978                 .dir_fh = NFS_FH(dir),
2979                 .name   = name,
2980                 .bitmask = server->attr_bitmask,
2981         };
2982         struct nfs4_link_res res = {
2983                 .server = server,
2984         };
2985         struct rpc_message msg = {
2986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2987                 .rpc_argp = &arg,
2988                 .rpc_resp = &res,
2989         };
2990         int status = -ENOMEM;
2991
2992         res.fattr = nfs_alloc_fattr();
2993         if (res.fattr == NULL)
2994                 goto out;
2995
2996         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2997         if (!status) {
2998                 update_changeattr(dir, &res.cinfo);
2999                 nfs_post_op_update_inode(inode, res.fattr);
3000         }
3001 out:
3002         nfs_free_fattr(res.fattr);
3003         return status;
3004 }
3005
3006 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3007 {
3008         struct nfs4_exception exception = { };
3009         int err;
3010         do {
3011                 err = nfs4_handle_exception(NFS_SERVER(inode),
3012                                 _nfs4_proc_link(inode, dir, name),
3013                                 &exception);
3014         } while (exception.retry);
3015         return err;
3016 }
3017
3018 struct nfs4_createdata {
3019         struct rpc_message msg;
3020         struct nfs4_create_arg arg;
3021         struct nfs4_create_res res;
3022         struct nfs_fh fh;
3023         struct nfs_fattr fattr;
3024 };
3025
3026 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3027                 struct qstr *name, struct iattr *sattr, u32 ftype)
3028 {
3029         struct nfs4_createdata *data;
3030
3031         data = kzalloc(sizeof(*data), GFP_KERNEL);
3032         if (data != NULL) {
3033                 struct nfs_server *server = NFS_SERVER(dir);
3034
3035                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3036                 data->msg.rpc_argp = &data->arg;
3037                 data->msg.rpc_resp = &data->res;
3038                 data->arg.dir_fh = NFS_FH(dir);
3039                 data->arg.server = server;
3040                 data->arg.name = name;
3041                 data->arg.attrs = sattr;
3042                 data->arg.ftype = ftype;
3043                 data->arg.bitmask = server->attr_bitmask;
3044                 data->res.server = server;
3045                 data->res.fh = &data->fh;
3046                 data->res.fattr = &data->fattr;
3047                 nfs_fattr_init(data->res.fattr);
3048         }
3049         return data;
3050 }
3051
3052 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3053 {
3054         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3055                                     &data->arg.seq_args, &data->res.seq_res, 1);
3056         if (status == 0) {
3057                 update_changeattr(dir, &data->res.dir_cinfo);
3058                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3059         }
3060         return status;
3061 }
3062
3063 static void nfs4_free_createdata(struct nfs4_createdata *data)
3064 {
3065         kfree(data);
3066 }
3067
3068 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3069                 struct page *page, unsigned int len, struct iattr *sattr)
3070 {
3071         struct nfs4_createdata *data;
3072         int status = -ENAMETOOLONG;
3073
3074         if (len > NFS4_MAXPATHLEN)
3075                 goto out;
3076
3077         status = -ENOMEM;
3078         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3079         if (data == NULL)
3080                 goto out;
3081
3082         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3083         data->arg.u.symlink.pages = &page;
3084         data->arg.u.symlink.len = len;
3085
3086         status = nfs4_do_create(dir, dentry, data);
3087
3088         nfs4_free_createdata(data);
3089 out:
3090         return status;
3091 }
3092
3093 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3094                 struct page *page, unsigned int len, struct iattr *sattr)
3095 {
3096         struct nfs4_exception exception = { };
3097         int err;
3098         do {
3099                 err = nfs4_handle_exception(NFS_SERVER(dir),
3100                                 _nfs4_proc_symlink(dir, dentry, page,
3101                                                         len, sattr),
3102                                 &exception);
3103         } while (exception.retry);
3104         return err;
3105 }
3106
3107 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3108                 struct iattr *sattr)
3109 {
3110         struct nfs4_createdata *data;
3111         int status = -ENOMEM;
3112
3113         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3114         if (data == NULL)
3115                 goto out;
3116
3117         status = nfs4_do_create(dir, dentry, data);
3118
3119         nfs4_free_createdata(data);
3120 out:
3121         return status;
3122 }
3123
3124 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3125                 struct iattr *sattr)
3126 {
3127         struct nfs4_exception exception = { };
3128         int err;
3129
3130         sattr->ia_mode &= ~current_umask();
3131         do {
3132                 err = nfs4_handle_exception(NFS_SERVER(dir),
3133                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3134                                 &exception);
3135         } while (exception.retry);
3136         return err;
3137 }
3138
3139 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3140                 u64 cookie, struct page **pages, unsigned int count, int plus)
3141 {
3142         struct inode            *dir = dentry->d_inode;
3143         struct nfs4_readdir_arg args = {
3144                 .fh = NFS_FH(dir),
3145                 .pages = pages,
3146                 .pgbase = 0,
3147                 .count = count,
3148                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3149                 .plus = plus,
3150         };
3151         struct nfs4_readdir_res res;
3152         struct rpc_message msg = {
3153                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3154                 .rpc_argp = &args,
3155                 .rpc_resp = &res,
3156                 .rpc_cred = cred,
3157         };
3158         int                     status;
3159
3160         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3161                         dentry->d_parent->d_name.name,
3162                         dentry->d_name.name,
3163                         (unsigned long long)cookie);
3164         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3165         res.pgbase = args.pgbase;
3166         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3167         if (status >= 0) {
3168                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3169                 status += args.pgbase;
3170         }
3171
3172         nfs_invalidate_atime(dir);
3173
3174         dprintk("%s: returns %d\n", __func__, status);
3175         return status;
3176 }
3177
3178 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3179                 u64 cookie, struct page **pages, unsigned int count, int plus)
3180 {
3181         struct nfs4_exception exception = { };
3182         int err;
3183         do {
3184                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3185                                 _nfs4_proc_readdir(dentry, cred, cookie,
3186                                         pages, count, plus),
3187                                 &exception);
3188         } while (exception.retry);
3189         return err;
3190 }
3191
3192 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3193                 struct iattr *sattr, dev_t rdev)
3194 {
3195         struct nfs4_createdata *data;
3196         int mode = sattr->ia_mode;
3197         int status = -ENOMEM;
3198
3199         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3200         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3201
3202         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3203         if (data == NULL)
3204                 goto out;
3205
3206         if (S_ISFIFO(mode))
3207                 data->arg.ftype = NF4FIFO;
3208         else if (S_ISBLK(mode)) {
3209                 data->arg.ftype = NF4BLK;
3210                 data->arg.u.device.specdata1 = MAJOR(rdev);
3211                 data->arg.u.device.specdata2 = MINOR(rdev);
3212         }
3213         else if (S_ISCHR(mode)) {
3214                 data->arg.ftype = NF4CHR;
3215                 data->arg.u.device.specdata1 = MAJOR(rdev);
3216                 data->arg.u.device.specdata2 = MINOR(rdev);
3217         }
3218
3219         status = nfs4_do_create(dir, dentry, data);
3220
3221         nfs4_free_createdata(data);
3222 out:
3223         return status;
3224 }
3225
3226 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3227                 struct iattr *sattr, dev_t rdev)
3228 {
3229         struct nfs4_exception exception = { };
3230         int err;
3231
3232         sattr->ia_mode &= ~current_umask();
3233         do {
3234                 err = nfs4_handle_exception(NFS_SERVER(dir),
3235                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3236                                 &exception);
3237         } while (exception.retry);
3238         return err;
3239 }
3240
3241 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3242                  struct nfs_fsstat *fsstat)
3243 {
3244         struct nfs4_statfs_arg args = {
3245                 .fh = fhandle,
3246                 .bitmask = server->attr_bitmask,
3247         };
3248         struct nfs4_statfs_res res = {
3249                 .fsstat = fsstat,
3250         };
3251         struct rpc_message msg = {
3252                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3253                 .rpc_argp = &args,
3254                 .rpc_resp = &res,
3255         };
3256
3257         nfs_fattr_init(fsstat->fattr);
3258         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3259 }
3260
3261 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3262 {
3263         struct nfs4_exception exception = { };
3264         int err;
3265         do {
3266                 err = nfs4_handle_exception(server,
3267                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3268                                 &exception);
3269         } while (exception.retry);
3270         return err;
3271 }
3272
3273 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3274                 struct nfs_fsinfo *fsinfo)
3275 {
3276         struct nfs4_fsinfo_arg args = {
3277                 .fh = fhandle,
3278                 .bitmask = server->attr_bitmask,
3279         };
3280         struct nfs4_fsinfo_res res = {
3281                 .fsinfo = fsinfo,
3282         };
3283         struct rpc_message msg = {
3284                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3285                 .rpc_argp = &args,
3286                 .rpc_resp = &res,
3287         };
3288
3289         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3290 }
3291
3292 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3293 {
3294         struct nfs4_exception exception = { };
3295         int err;
3296
3297         do {
3298                 err = nfs4_handle_exception(server,
3299                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3300                                 &exception);
3301         } while (exception.retry);
3302         return err;
3303 }
3304
3305 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3306 {
3307         nfs_fattr_init(fsinfo->fattr);
3308         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3309 }
3310
3311 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3312                 struct nfs_pathconf *pathconf)
3313 {
3314         struct nfs4_pathconf_arg args = {
3315                 .fh = fhandle,
3316                 .bitmask = server->attr_bitmask,
3317         };
3318         struct nfs4_pathconf_res res = {
3319                 .pathconf = pathconf,
3320         };
3321         struct rpc_message msg = {
3322                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3323                 .rpc_argp = &args,
3324                 .rpc_resp = &res,
3325         };
3326
3327         /* None of the pathconf attributes are mandatory to implement */
3328         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3329                 memset(pathconf, 0, sizeof(*pathconf));
3330                 return 0;
3331         }
3332
3333         nfs_fattr_init(pathconf->fattr);
3334         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3335 }
3336
3337 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3338                 struct nfs_pathconf *pathconf)
3339 {
3340         struct nfs4_exception exception = { };
3341         int err;
3342
3343         do {
3344                 err = nfs4_handle_exception(server,
3345                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3346                                 &exception);
3347         } while (exception.retry);
3348         return err;
3349 }
3350
3351 void __nfs4_read_done_cb(struct nfs_read_data *data)
3352 {
3353         nfs_invalidate_atime(data->header->inode);
3354 }
3355
3356 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3357 {
3358         struct nfs_server *server = NFS_SERVER(data->header->inode);
3359
3360         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3361                 rpc_restart_call_prepare(task);
3362                 return -EAGAIN;
3363         }
3364
3365         __nfs4_read_done_cb(data);
3366         if (task->tk_status > 0)
3367                 renew_lease(server, data->timestamp);
3368         return 0;
3369 }
3370
3371 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3372 {
3373
3374         dprintk("--> %s\n", __func__);
3375
3376         if (!nfs4_sequence_done(task, &data->res.seq_res))
3377                 return -EAGAIN;
3378
3379         return data->read_done_cb ? data->read_done_cb(task, data) :
3380                                     nfs4_read_done_cb(task, data);
3381 }
3382
3383 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3384 {
3385         data->timestamp   = jiffies;
3386         data->read_done_cb = nfs4_read_done_cb;
3387         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3388         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3389 }
3390
3391 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3392 {
3393         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3394                                 &data->args.seq_args,
3395                                 &data->res.seq_res,
3396                                 task))
3397                 return;
3398         rpc_call_start(task);
3399 }
3400
3401 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3402 {
3403         struct inode *inode = data->header->inode;
3404
3405         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3406                 rpc_restart_call_prepare(task);
3407                 return -EAGAIN;
3408         }
3409         if (task->tk_status >= 0) {
3410                 renew_lease(NFS_SERVER(inode), data->timestamp);
3411                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3412         }
3413         return 0;
3414 }
3415
3416 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3417 {
3418         if (!nfs4_sequence_done(task, &data->res.seq_res))
3419                 return -EAGAIN;
3420         return data->write_done_cb ? data->write_done_cb(task, data) :
3421                 nfs4_write_done_cb(task, data);
3422 }
3423
3424 static
3425 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3426 {
3427         const struct nfs_pgio_header *hdr = data->header;
3428
3429         /* Don't request attributes for pNFS or O_DIRECT writes */
3430         if (data->ds_clp != NULL || hdr->dreq != NULL)
3431                 return false;
3432         /* Otherwise, request attributes if and only if we don't hold
3433          * a delegation
3434          */
3435         return nfs_have_delegation(hdr->inode, FMODE_READ) == 0;
3436 }
3437
3438 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3439 {
3440         struct nfs_server *server = NFS_SERVER(data->header->inode);
3441
3442         if (!nfs4_write_need_cache_consistency_data(data)) {
3443                 data->args.bitmask = NULL;
3444                 data->res.fattr = NULL;
3445         } else
3446                 data->args.bitmask = server->cache_consistency_bitmask;
3447
3448         if (!data->write_done_cb)
3449                 data->write_done_cb = nfs4_write_done_cb;
3450         data->res.server = server;
3451         data->timestamp   = jiffies;
3452
3453         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3454         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3455 }
3456
3457 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3458 {
3459         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3460                                 &data->args.seq_args,
3461                                 &data->res.seq_res,
3462                                 task))
3463                 return;
3464         rpc_call_start(task);
3465 }
3466
3467 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3468 {
3469         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3470                                 &data->args.seq_args,
3471                                 &data->res.seq_res,
3472                                 task))
3473                 return;
3474         rpc_call_start(task);
3475 }
3476
3477 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3478 {
3479         struct inode *inode = data->inode;
3480
3481         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3482                 rpc_restart_call_prepare(task);
3483                 return -EAGAIN;
3484         }
3485         return 0;
3486 }
3487
3488 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3489 {
3490         if (!nfs4_sequence_done(task, &data->res.seq_res))
3491                 return -EAGAIN;
3492         return data->commit_done_cb(task, data);
3493 }
3494
3495 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3496 {
3497         struct nfs_server *server = NFS_SERVER(data->inode);
3498
3499         if (data->commit_done_cb == NULL)
3500                 data->commit_done_cb = nfs4_commit_done_cb;
3501         data->res.server = server;
3502         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3503         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3504 }
3505
3506 struct nfs4_renewdata {
3507         struct nfs_client       *client;
3508         unsigned long           timestamp;
3509 };
3510
3511 /*
3512  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3513  * standalone procedure for queueing an asynchronous RENEW.
3514  */
3515 static void nfs4_renew_release(void *calldata)
3516 {
3517         struct nfs4_renewdata *data = calldata;
3518         struct nfs_client *clp = data->client;
3519
3520         if (atomic_read(&clp->cl_count) > 1)
3521                 nfs4_schedule_state_renewal(clp);
3522         nfs_put_client(clp);
3523         kfree(data);
3524 }
3525
3526 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3527 {
3528         struct nfs4_renewdata *data = calldata;
3529         struct nfs_client *clp = data->client;
3530         unsigned long timestamp = data->timestamp;
3531
3532         if (task->tk_status < 0) {
3533                 /* Unless we're shutting down, schedule state recovery! */
3534                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3535                         return;
3536                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3537                         nfs4_schedule_lease_recovery(clp);
3538                         return;
3539                 }
3540                 nfs4_schedule_path_down_recovery(clp);
3541         }
3542         do_renew_lease(clp, timestamp);
3543 }
3544
3545 static const struct rpc_call_ops nfs4_renew_ops = {
3546         .rpc_call_done = nfs4_renew_done,
3547         .rpc_release = nfs4_renew_release,
3548 };
3549
3550 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3551 {
3552         struct rpc_message msg = {
3553                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3554                 .rpc_argp       = clp,
3555                 .rpc_cred       = cred,
3556         };
3557         struct nfs4_renewdata *data;
3558
3559         if (renew_flags == 0)
3560                 return 0;
3561         if (!atomic_inc_not_zero(&clp->cl_count))
3562                 return -EIO;
3563         data = kmalloc(sizeof(*data), GFP_NOFS);
3564         if (data == NULL)
3565                 return -ENOMEM;
3566         data->client = clp;
3567         data->timestamp = jiffies;
3568         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3569                         &nfs4_renew_ops, data);
3570 }
3571
3572 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3573 {
3574         struct rpc_message msg = {
3575                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3576                 .rpc_argp       = clp,
3577                 .rpc_cred       = cred,
3578         };
3579         unsigned long now = jiffies;
3580         int status;
3581
3582         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3583         if (status < 0)
3584                 return status;
3585         do_renew_lease(clp, now);
3586         return 0;
3587 }
3588
3589 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3590 {
3591         return (server->caps & NFS_CAP_ACLS)
3592                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3593                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3594 }
3595
3596 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3597  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3598  * the stack.
3599  */
3600 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3601
3602 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3603                 struct page **pages, unsigned int *pgbase)
3604 {
3605         struct page *newpage, **spages;
3606         int rc = 0;
3607         size_t len;
3608         spages = pages;
3609
3610         do {
3611                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3612                 newpage = alloc_page(GFP_KERNEL);
3613
3614                 if (newpage == NULL)
3615                         goto unwind;
3616                 memcpy(page_address(newpage), buf, len);
3617                 buf += len;
3618                 buflen -= len;
3619                 *pages++ = newpage;
3620                 rc++;
3621         } while (buflen != 0);
3622
3623         return rc;
3624
3625 unwind:
3626         for(; rc > 0; rc--)
3627                 __free_page(spages[rc-1]);
3628         return -ENOMEM;
3629 }
3630
3631 struct nfs4_cached_acl {
3632         int cached;
3633         size_t len;
3634         char data[0];
3635 };
3636
3637 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3638 {
3639         struct nfs_inode *nfsi = NFS_I(inode);
3640
3641         spin_lock(&inode->i_lock);
3642         kfree(nfsi->nfs4_acl);
3643         nfsi->nfs4_acl = acl;
3644         spin_unlock(&inode->i_lock);
3645 }
3646
3647 static void nfs4_zap_acl_attr(struct inode *inode)
3648 {
3649         nfs4_set_cached_acl(inode, NULL);
3650 }
3651
3652 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3653 {
3654         struct nfs_inode *nfsi = NFS_I(inode);
3655         struct nfs4_cached_acl *acl;
3656         int ret = -ENOENT;
3657
3658         spin_lock(&inode->i_lock);
3659         acl = nfsi->nfs4_acl;
3660         if (acl == NULL)
3661                 goto out;
3662         if (buf == NULL) /* user is just asking for length */
3663                 goto out_len;
3664         if (acl->cached == 0)
3665                 goto out;
3666         ret = -ERANGE; /* see getxattr(2) man page */
3667         if (acl->len > buflen)
3668                 goto out;
3669         memcpy(buf, acl->data, acl->len);
3670 out_len:
3671         ret = acl->len;
3672 out:
3673         spin_unlock(&inode->i_lock);
3674         return ret;
3675 }
3676
3677 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3678 {
3679         struct nfs4_cached_acl *acl;
3680
3681         if (pages && acl_len <= PAGE_SIZE) {
3682                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3683                 if (acl == NULL)
3684                         goto out;
3685                 acl->cached = 1;
3686                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3687         } else {
3688                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3689                 if (acl == NULL)
3690                         goto out;
3691                 acl->cached = 0;
3692         }
3693         acl->len = acl_len;
3694 out:
3695         nfs4_set_cached_acl(inode, acl);
3696 }
3697
3698 /*
3699  * The getxattr API returns the required buffer length when called with a
3700  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3701  * the required buf.  On a NULL buf, we send a page of data to the server
3702  * guessing that the ACL request can be serviced by a page. If so, we cache
3703  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3704  * the cache. If not so, we throw away the page, and cache the required
3705  * length. The next getxattr call will then produce another round trip to
3706  * the server, this time with the input buf of the required size.
3707  */
3708 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3709 {
3710         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3711         struct nfs_getaclargs args = {
3712                 .fh = NFS_FH(inode),
3713                 .acl_pages = pages,
3714                 .acl_len = buflen,
3715         };
3716         struct nfs_getaclres res = {
3717                 .acl_len = buflen,
3718         };
3719         struct rpc_message msg = {
3720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3721                 .rpc_argp = &args,
3722                 .rpc_resp = &res,
3723         };
3724         int ret = -ENOMEM, npages, i, acl_len = 0;
3725
3726         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3727         /* As long as we're doing a round trip to the server anyway,
3728          * let's be prepared for a page of acl data. */
3729         if (npages == 0)
3730                 npages = 1;
3731
3732         /* Add an extra page to handle the bitmap returned */
3733         npages++;
3734
3735         for (i = 0; i < npages; i++) {
3736                 pages[i] = alloc_page(GFP_KERNEL);
3737                 if (!pages[i])
3738                         goto out_free;
3739         }
3740
3741         /* for decoding across pages */
3742         res.acl_scratch = alloc_page(GFP_KERNEL);
3743         if (!res.acl_scratch)
3744                 goto out_free;
3745
3746         args.acl_len = npages * PAGE_SIZE;
3747         args.acl_pgbase = 0;
3748
3749         /* Let decode_getfacl know not to fail if the ACL data is larger than
3750          * the page we send as a guess */
3751         if (buf == NULL)
3752                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3753
3754         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3755                 __func__, buf, buflen, npages, args.acl_len);
3756         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3757                              &msg, &args.seq_args, &res.seq_res, 0);
3758         if (ret)
3759                 goto out_free;
3760
3761         acl_len = res.acl_len - res.acl_data_offset;
3762         if (acl_len > args.acl_len)
3763                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3764         else
3765                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3766                                       acl_len);
3767         if (buf) {
3768                 ret = -ERANGE;
3769                 if (acl_len > buflen)
3770                         goto out_free;
3771                 _copy_from_pages(buf, pages, res.acl_data_offset,
3772                                 acl_len);
3773         }
3774         ret = acl_len;
3775 out_free:
3776         for (i = 0; i < npages; i++)
3777                 if (pages[i])
3778                         __free_page(pages[i]);
3779         if (res.acl_scratch)
3780                 __free_page(res.acl_scratch);
3781         return ret;
3782 }
3783
3784 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3785 {
3786         struct nfs4_exception exception = { };
3787         ssize_t ret;
3788         do {
3789                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3790                 if (ret >= 0)
3791                         break;
3792                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3793         } while (exception.retry);
3794         return ret;
3795 }
3796
3797 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3798 {
3799         struct nfs_server *server = NFS_SERVER(inode);
3800         int ret;
3801
3802         if (!nfs4_server_supports_acls(server))
3803                 return -EOPNOTSUPP;
3804         ret = nfs_revalidate_inode(server, inode);
3805         if (ret < 0)
3806                 return ret;
3807         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3808                 nfs_zap_acl_cache(inode);
3809         ret = nfs4_read_cached_acl(inode, buf, buflen);
3810         if (ret != -ENOENT)
3811                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3812                  * but no cached acl data, just the acl length */
3813                 return ret;
3814         return nfs4_get_acl_uncached(inode, buf, buflen);
3815 }
3816
3817 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3818 {
3819         struct nfs_server *server = NFS_SERVER(inode);
3820         struct page *pages[NFS4ACL_MAXPAGES];
3821         struct nfs_setaclargs arg = {
3822                 .fh             = NFS_FH(inode),
3823                 .acl_pages      = pages,
3824                 .acl_len        = buflen,
3825         };
3826         struct nfs_setaclres res;
3827         struct rpc_message msg = {
3828                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3829                 .rpc_argp       = &arg,
3830                 .rpc_resp       = &res,
3831         };
3832         int ret, i;
3833
3834         if (!nfs4_server_supports_acls(server))
3835                 return -EOPNOTSUPP;
3836         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3837         if (i < 0)
3838                 return i;
3839         nfs_inode_return_delegation(inode);
3840         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3841
3842         /*
3843          * Free each page after tx, so the only ref left is
3844          * held by the network stack
3845          */
3846         for (; i > 0; i--)
3847                 put_page(pages[i-1]);
3848
3849         /*
3850          * Acl update can result in inode attribute update.
3851          * so mark the attribute cache invalid.
3852          */
3853         spin_lock(&inode->i_lock);
3854         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3855         spin_unlock(&inode->i_lock);
3856         nfs_access_zap_cache(inode);
3857         nfs_zap_acl_cache(inode);
3858         return ret;
3859 }
3860
3861 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3862 {
3863         struct nfs4_exception exception = { };
3864         int err;
3865         do {
3866                 err = nfs4_handle_exception(NFS_SERVER(inode),
3867                                 __nfs4_proc_set_acl(inode, buf, buflen),
3868                                 &exception);
3869         } while (exception.retry);
3870         return err;
3871 }
3872
3873 static int
3874 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3875 {
3876         struct nfs_client *clp = server->nfs_client;
3877
3878         if (task->tk_status >= 0)
3879                 return 0;
3880         switch(task->tk_status) {
3881                 case -NFS4ERR_DELEG_REVOKED:
3882                 case -NFS4ERR_ADMIN_REVOKED:
3883                 case -NFS4ERR_BAD_STATEID:
3884                         if (state == NULL)
3885                                 break;
3886                         nfs_remove_bad_delegation(state->inode);
3887                 case -NFS4ERR_OPENMODE:
3888                         if (state == NULL)
3889                                 break;
3890                         nfs4_schedule_stateid_recovery(server, state);
3891                         goto wait_on_recovery;
3892                 case -NFS4ERR_EXPIRED:
3893                         if (state != NULL)
3894                                 nfs4_schedule_stateid_recovery(server, state);
3895                 case -NFS4ERR_STALE_STATEID:
3896                 case -NFS4ERR_STALE_CLIENTID:
3897                         nfs4_schedule_lease_recovery(clp);
3898                         goto wait_on_recovery;
3899 #if defined(CONFIG_NFS_V4_1)
3900                 case -NFS4ERR_BADSESSION:
3901                 case -NFS4ERR_BADSLOT:
3902                 case -NFS4ERR_BAD_HIGH_SLOT:
3903                 case -NFS4ERR_DEADSESSION:
3904                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3905                 case -NFS4ERR_SEQ_FALSE_RETRY:
3906                 case -NFS4ERR_SEQ_MISORDERED:
3907                         dprintk("%s ERROR %d, Reset session\n", __func__,
3908                                 task->tk_status);
3909                         nfs4_schedule_session_recovery(clp->cl_session);
3910                         task->tk_status = 0;
3911                         return -EAGAIN;
3912 #endif /* CONFIG_NFS_V4_1 */
3913                 case -NFS4ERR_DELAY:
3914                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3915                 case -NFS4ERR_GRACE:
3916                 case -EKEYEXPIRED:
3917                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3918                         task->tk_status = 0;
3919                         return -EAGAIN;
3920                 case -NFS4ERR_RETRY_UNCACHED_REP:
3921                 case -NFS4ERR_OLD_STATEID:
3922                         task->tk_status = 0;
3923                         return -EAGAIN;
3924         }
3925         task->tk_status = nfs4_map_errors(task->tk_status);
3926         return 0;
3927 wait_on_recovery:
3928         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3929         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3930                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3931         task->tk_status = 0;
3932         return -EAGAIN;
3933 }
3934
3935 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3936                                     nfs4_verifier *bootverf)
3937 {
3938         __be32 verf[2];
3939
3940         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3941                 /* An impossible timestamp guarantees this value
3942                  * will never match a generated boot time. */
3943                 verf[0] = 0;
3944                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3945         } else {
3946                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3947                 verf[0] = (__be32)nn->boot_time.tv_sec;
3948                 verf[1] = (__be32)nn->boot_time.tv_nsec;
3949         }
3950         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3951 }
3952
3953 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3954                 unsigned short port, struct rpc_cred *cred,
3955                 struct nfs4_setclientid_res *res)
3956 {
3957         nfs4_verifier sc_verifier;
3958         struct nfs4_setclientid setclientid = {
3959                 .sc_verifier = &sc_verifier,
3960                 .sc_prog = program,
3961                 .sc_cb_ident = clp->cl_cb_ident,
3962         };
3963         struct rpc_message msg = {
3964                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3965                 .rpc_argp = &setclientid,
3966                 .rpc_resp = res,
3967                 .rpc_cred = cred,
3968         };
3969         int loop = 0;
3970         int status;
3971
3972         nfs4_init_boot_verifier(clp, &sc_verifier);
3973
3974         for(;;) {
3975                 rcu_read_lock();
3976                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3977                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3978                                 clp->cl_ipaddr,
3979                                 rpc_peeraddr2str(clp->cl_rpcclient,
3980                                                         RPC_DISPLAY_ADDR),
3981                                 rpc_peeraddr2str(clp->cl_rpcclient,
3982                                                         RPC_DISPLAY_PROTO),
3983                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3984                                 clp->cl_id_uniquifier);
3985                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3986                                 sizeof(setclientid.sc_netid),
3987                                 rpc_peeraddr2str(clp->cl_rpcclient,
3988                                                         RPC_DISPLAY_NETID));
3989                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3990                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3991                                 clp->cl_ipaddr, port >> 8, port & 255);
3992                 rcu_read_unlock();
3993
3994                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3995                 if (status != -NFS4ERR_CLID_INUSE)
3996                         break;
3997                 if (loop != 0) {
3998                         ++clp->cl_id_uniquifier;
3999                         break;
4000                 }
4001                 ++loop;
4002                 ssleep(clp->cl_lease_time / HZ + 1);
4003         }
4004         return status;
4005 }
4006
4007 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4008                 struct nfs4_setclientid_res *arg,
4009                 struct rpc_cred *cred)
4010 {
4011         struct nfs_fsinfo fsinfo;
4012         struct rpc_message msg = {
4013                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4014                 .rpc_argp = arg,
4015                 .rpc_resp = &fsinfo,
4016                 .rpc_cred = cred,
4017         };
4018         unsigned long now;
4019         int status;
4020
4021         now = jiffies;
4022         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4023         if (status == 0) {
4024                 spin_lock(&clp->cl_lock);
4025                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4026                 clp->cl_last_renewal = now;
4027                 spin_unlock(&clp->cl_lock);
4028         }
4029         return status;
4030 }
4031
4032 struct nfs4_delegreturndata {
4033         struct nfs4_delegreturnargs args;
4034         struct nfs4_delegreturnres res;
4035         struct nfs_fh fh;
4036         nfs4_stateid stateid;
4037         unsigned long timestamp;
4038         struct nfs_fattr fattr;
4039         int rpc_status;
4040 };
4041
4042 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4043 {
4044         struct nfs4_delegreturndata *data = calldata;
4045
4046         if (!nfs4_sequence_done(task, &data->res.seq_res))
4047                 return;
4048
4049         switch (task->tk_status) {
4050         case -NFS4ERR_STALE_STATEID:
4051         case -NFS4ERR_EXPIRED:
4052         case 0:
4053                 renew_lease(data->res.server, data->timestamp);
4054                 break;
4055         default:
4056                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4057                                 -EAGAIN) {
4058                         rpc_restart_call_prepare(task);
4059                         return;
4060                 }
4061         }
4062         data->rpc_status = task->tk_status;
4063 }
4064
4065 static void nfs4_delegreturn_release(void *calldata)
4066 {
4067         kfree(calldata);
4068 }
4069
4070 #if defined(CONFIG_NFS_V4_1)
4071 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4072 {
4073         struct nfs4_delegreturndata *d_data;
4074
4075         d_data = (struct nfs4_delegreturndata *)data;
4076
4077         if (nfs4_setup_sequence(d_data->res.server,
4078                                 &d_data->args.seq_args,
4079                                 &d_data->res.seq_res, task))
4080                 return;
4081         rpc_call_start(task);
4082 }
4083 #endif /* CONFIG_NFS_V4_1 */
4084
4085 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4086 #if defined(CONFIG_NFS_V4_1)
4087         .rpc_call_prepare = nfs4_delegreturn_prepare,
4088 #endif /* CONFIG_NFS_V4_1 */
4089         .rpc_call_done = nfs4_delegreturn_done,
4090         .rpc_release = nfs4_delegreturn_release,
4091 };
4092
4093 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4094 {
4095         struct nfs4_delegreturndata *data;
4096         struct nfs_server *server = NFS_SERVER(inode);
4097         struct rpc_task *task;
4098         struct rpc_message msg = {
4099                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4100                 .rpc_cred = cred,
4101         };
4102         struct rpc_task_setup task_setup_data = {
4103                 .rpc_client = server->client,
4104                 .rpc_message = &msg,
4105                 .callback_ops = &nfs4_delegreturn_ops,
4106                 .flags = RPC_TASK_ASYNC,
4107         };
4108         int status = 0;
4109
4110         data = kzalloc(sizeof(*data), GFP_NOFS);
4111         if (data == NULL)
4112                 return -ENOMEM;
4113         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4114         data->args.fhandle = &data->fh;
4115         data->args.stateid = &data->stateid;
4116         data->args.bitmask = server->cache_consistency_bitmask;
4117         nfs_copy_fh(&data->fh, NFS_FH(inode));
4118         nfs4_stateid_copy(&data->stateid, stateid);
4119         data->res.fattr = &data->fattr;
4120         data->res.server = server;
4121         nfs_fattr_init(data->res.fattr);
4122         data->timestamp = jiffies;
4123         data->rpc_status = 0;
4124
4125         task_setup_data.callback_data = data;
4126         msg.rpc_argp = &data->args;
4127         msg.rpc_resp = &data->res;
4128         task = rpc_run_task(&task_setup_data);
4129         if (IS_ERR(task))
4130                 return PTR_ERR(task);
4131         if (!issync)
4132                 goto out;
4133         status = nfs4_wait_for_completion_rpc_task(task);
4134         if (status != 0)
4135                 goto out;
4136         status = data->rpc_status;
4137         if (status == 0)
4138                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4139         else
4140                 nfs_refresh_inode(inode, &data->fattr);
4141 out:
4142         rpc_put_task(task);
4143         return status;
4144 }
4145
4146 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4147 {
4148         struct nfs_server *server = NFS_SERVER(inode);
4149         struct nfs4_exception exception = { };
4150         int err;
4151         do {
4152                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4153                 switch (err) {
4154                         case -NFS4ERR_STALE_STATEID:
4155                         case -NFS4ERR_EXPIRED:
4156                         case 0:
4157                                 return 0;
4158                 }
4159                 err = nfs4_handle_exception(server, err, &exception);
4160         } while (exception.retry);
4161         return err;
4162 }
4163
4164 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4165 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4166
4167 /*
4168  * sleep, with exponential backoff, and retry the LOCK operation.
4169  */
4170 static unsigned long
4171 nfs4_set_lock_task_retry(unsigned long timeout)
4172 {
4173         freezable_schedule_timeout_killable(timeout);
4174         timeout <<= 1;
4175         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4176                 return NFS4_LOCK_MAXTIMEOUT;
4177         return timeout;
4178 }
4179
4180 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4181 {
4182         struct inode *inode = state->inode;
4183         struct nfs_server *server = NFS_SERVER(inode);
4184         struct nfs_client *clp = server->nfs_client;
4185         struct nfs_lockt_args arg = {
4186                 .fh = NFS_FH(inode),
4187                 .fl = request,
4188         };
4189         struct nfs_lockt_res res = {
4190                 .denied = request,
4191         };
4192         struct rpc_message msg = {
4193                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4194                 .rpc_argp       = &arg,
4195                 .rpc_resp       = &res,
4196                 .rpc_cred       = state->owner->so_cred,
4197         };
4198         struct nfs4_lock_state *lsp;
4199         int status;
4200
4201         arg.lock_owner.clientid = clp->cl_clientid;
4202         status = nfs4_set_lock_state(state, request);
4203         if (status != 0)
4204                 goto out;
4205         lsp = request->fl_u.nfs4_fl.owner;
4206         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4207         arg.lock_owner.s_dev = server->s_dev;
4208         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4209         switch (status) {
4210                 case 0:
4211                         request->fl_type = F_UNLCK;
4212                         break;
4213                 case -NFS4ERR_DENIED:
4214                         status = 0;
4215         }
4216         request->fl_ops->fl_release_private(request);
4217 out:
4218         return status;
4219 }
4220
4221 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4222 {
4223         struct nfs4_exception exception = { };
4224         int err;
4225
4226         do {
4227                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4228                                 _nfs4_proc_getlk(state, cmd, request),
4229                                 &exception);
4230         } while (exception.retry);
4231         return err;
4232 }
4233
4234 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4235 {
4236         int res = 0;
4237         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4238                 case FL_POSIX:
4239                         res = posix_lock_file_wait(file, fl);
4240                         break;
4241                 case FL_FLOCK:
4242                         res = flock_lock_file_wait(file, fl);
4243                         break;
4244                 default:
4245                         BUG();
4246         }
4247         return res;
4248 }
4249
4250 struct nfs4_unlockdata {
4251         struct nfs_locku_args arg;
4252         struct nfs_locku_res res;
4253         struct nfs4_lock_state *lsp;
4254         struct nfs_open_context *ctx;
4255         struct file_lock fl;
4256         const struct nfs_server *server;
4257         unsigned long timestamp;
4258 };
4259
4260 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4261                 struct nfs_open_context *ctx,
4262                 struct nfs4_lock_state *lsp,
4263                 struct nfs_seqid *seqid)
4264 {
4265         struct nfs4_unlockdata *p;
4266         struct inode *inode = lsp->ls_state->inode;
4267
4268         p = kzalloc(sizeof(*p), GFP_NOFS);
4269         if (p == NULL)
4270                 return NULL;
4271         p->arg.fh = NFS_FH(inode);
4272         p->arg.fl = &p->fl;
4273         p->arg.seqid = seqid;
4274         p->res.seqid = seqid;
4275         p->arg.stateid = &lsp->ls_stateid;
4276         p->lsp = lsp;
4277         atomic_inc(&lsp->ls_count);
4278         /* Ensure we don't close file until we're done freeing locks! */
4279         p->ctx = get_nfs_open_context(ctx);
4280         memcpy(&p->fl, fl, sizeof(p->fl));
4281         p->server = NFS_SERVER(inode);
4282         return p;
4283 }
4284
4285 static void nfs4_locku_release_calldata(void *data)
4286 {
4287         struct nfs4_unlockdata *calldata = data;
4288         nfs_free_seqid(calldata->arg.seqid);
4289         nfs4_put_lock_state(calldata->lsp);
4290         put_nfs_open_context(calldata->ctx);
4291         kfree(calldata);
4292 }
4293
4294 static void nfs4_locku_done(struct rpc_task *task, void *data)
4295 {
4296         struct nfs4_unlockdata *calldata = data;
4297
4298         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4299                 return;
4300         switch (task->tk_status) {
4301                 case 0:
4302                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4303                                         &calldata->res.stateid);
4304                         renew_lease(calldata->server, calldata->timestamp);
4305                         break;
4306                 case -NFS4ERR_BAD_STATEID:
4307                 case -NFS4ERR_OLD_STATEID:
4308                 case -NFS4ERR_STALE_STATEID:
4309                 case -NFS4ERR_EXPIRED:
4310                         break;
4311                 default:
4312                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4313                                 rpc_restart_call_prepare(task);
4314         }
4315 }
4316
4317 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4318 {
4319         struct nfs4_unlockdata *calldata = data;
4320
4321         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4322                 return;
4323         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4324                 /* Note: exit _without_ running nfs4_locku_done */
4325                 task->tk_action = NULL;
4326                 return;
4327         }
4328         calldata->timestamp = jiffies;
4329         if (nfs4_setup_sequence(calldata->server,
4330                                 &calldata->arg.seq_args,
4331                                 &calldata->res.seq_res, task))
4332                 return;
4333         rpc_call_start(task);
4334 }
4335
4336 static const struct rpc_call_ops nfs4_locku_ops = {
4337         .rpc_call_prepare = nfs4_locku_prepare,
4338         .rpc_call_done = nfs4_locku_done,
4339         .rpc_release = nfs4_locku_release_calldata,
4340 };
4341
4342 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4343                 struct nfs_open_context *ctx,
4344                 struct nfs4_lock_state *lsp,
4345                 struct nfs_seqid *seqid)
4346 {
4347         struct nfs4_unlockdata *data;
4348         struct rpc_message msg = {
4349                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4350                 .rpc_cred = ctx->cred,
4351         };
4352         struct rpc_task_setup task_setup_data = {
4353                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4354                 .rpc_message = &msg,
4355                 .callback_ops = &nfs4_locku_ops,
4356                 .workqueue = nfsiod_workqueue,
4357                 .flags = RPC_TASK_ASYNC,
4358         };
4359
4360         /* Ensure this is an unlock - when canceling a lock, the
4361          * canceled lock is passed in, and it won't be an unlock.
4362          */
4363         fl->fl_type = F_UNLCK;
4364
4365         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4366         if (data == NULL) {
4367                 nfs_free_seqid(seqid);
4368                 return ERR_PTR(-ENOMEM);
4369         }
4370
4371         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4372         msg.rpc_argp = &data->arg;
4373         msg.rpc_resp = &data->res;
4374         task_setup_data.callback_data = data;
4375         return rpc_run_task(&task_setup_data);
4376 }
4377
4378 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4379 {
4380         struct nfs_inode *nfsi = NFS_I(state->inode);
4381         struct nfs_seqid *seqid;
4382         struct nfs4_lock_state *lsp;
4383         struct rpc_task *task;
4384         int status = 0;
4385         unsigned char fl_flags = request->fl_flags;
4386
4387         status = nfs4_set_lock_state(state, request);
4388         /* Unlock _before_ we do the RPC call */
4389         request->fl_flags |= FL_EXISTS;
4390         down_read(&nfsi->rwsem);
4391         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4392                 up_read(&nfsi->rwsem);
4393                 goto out;
4394         }
4395         up_read(&nfsi->rwsem);
4396         if (status != 0)
4397                 goto out;
4398         /* Is this a delegated lock? */
4399         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4400                 goto out;
4401         lsp = request->fl_u.nfs4_fl.owner;
4402         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4403         status = -ENOMEM;
4404         if (seqid == NULL)
4405                 goto out;
4406         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4407         status = PTR_ERR(task);
4408         if (IS_ERR(task))
4409                 goto out;
4410         status = nfs4_wait_for_completion_rpc_task(task);
4411         rpc_put_task(task);
4412 out:
4413         request->fl_flags = fl_flags;
4414         return status;
4415 }
4416
4417 struct nfs4_lockdata {
4418         struct nfs_lock_args arg;
4419         struct nfs_lock_res res;
4420         struct nfs4_lock_state *lsp;
4421         struct nfs_open_context *ctx;
4422         struct file_lock fl;
4423         unsigned long timestamp;
4424         int rpc_status;
4425         int cancelled;
4426         struct nfs_server *server;
4427 };
4428
4429 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4430                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4431                 gfp_t gfp_mask)
4432 {
4433         struct nfs4_lockdata *p;
4434         struct inode *inode = lsp->ls_state->inode;
4435         struct nfs_server *server = NFS_SERVER(inode);
4436
4437         p = kzalloc(sizeof(*p), gfp_mask);
4438         if (p == NULL)
4439                 return NULL;
4440
4441         p->arg.fh = NFS_FH(inode);
4442         p->arg.fl = &p->fl;
4443         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4444         if (p->arg.open_seqid == NULL)
4445                 goto out_free;
4446         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4447         if (p->arg.lock_seqid == NULL)
4448                 goto out_free_seqid;
4449         p->arg.lock_stateid = &lsp->ls_stateid;
4450         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4451         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4452         p->arg.lock_owner.s_dev = server->s_dev;
4453         p->res.lock_seqid = p->arg.lock_seqid;
4454         p->lsp = lsp;
4455         p->server = server;
4456         atomic_inc(&lsp->ls_count);
4457         p->ctx = get_nfs_open_context(ctx);
4458         memcpy(&p->fl, fl, sizeof(p->fl));
4459         return p;
4460 out_free_seqid:
4461         nfs_free_seqid(p->arg.open_seqid);
4462 out_free:
4463         kfree(p);
4464         return NULL;
4465 }
4466
4467 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4468 {
4469         struct nfs4_lockdata *data = calldata;
4470         struct nfs4_state *state = data->lsp->ls_state;
4471
4472         dprintk("%s: begin!\n", __func__);
4473         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4474                 return;
4475         /* Do we need to do an open_to_lock_owner? */
4476         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4477                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4478                         return;
4479                 data->arg.open_stateid = &state->stateid;
4480                 data->arg.new_lock_owner = 1;
4481                 data->res.open_seqid = data->arg.open_seqid;
4482         } else
4483                 data->arg.new_lock_owner = 0;
4484         data->timestamp = jiffies;
4485         if (nfs4_setup_sequence(data->server,
4486                                 &data->arg.seq_args,
4487                                 &data->res.seq_res, task))
4488                 return;
4489         rpc_call_start(task);
4490         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4491 }
4492
4493 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4494 {
4495         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4496         nfs4_lock_prepare(task, calldata);
4497 }
4498
4499 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4500 {
4501         struct nfs4_lockdata *data = calldata;
4502
4503         dprintk("%s: begin!\n", __func__);
4504
4505         if (!nfs4_sequence_done(task, &data->res.seq_res))
4506                 return;
4507
4508         data->rpc_status = task->tk_status;
4509         if (data->arg.new_lock_owner != 0) {
4510                 if (data->rpc_status == 0)
4511                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4512                 else
4513                         goto out;
4514         }
4515         if (data->rpc_status == 0) {
4516                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4517                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4518                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4519         }
4520 out:
4521         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4522 }
4523
4524 static void nfs4_lock_release(void *calldata)
4525 {
4526         struct nfs4_lockdata *data = calldata;
4527
4528         dprintk("%s: begin!\n", __func__);
4529         nfs_free_seqid(data->arg.open_seqid);
4530         if (data->cancelled != 0) {
4531                 struct rpc_task *task;
4532                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4533                                 data->arg.lock_seqid);
4534                 if (!IS_ERR(task))
4535                         rpc_put_task_async(task);
4536                 dprintk("%s: cancelling lock!\n", __func__);
4537         } else
4538                 nfs_free_seqid(data->arg.lock_seqid);
4539         nfs4_put_lock_state(data->lsp);
4540         put_nfs_open_context(data->ctx);
4541         kfree(data);
4542         dprintk("%s: done!\n", __func__);
4543 }
4544
4545 static const struct rpc_call_ops nfs4_lock_ops = {
4546         .rpc_call_prepare = nfs4_lock_prepare,
4547         .rpc_call_done = nfs4_lock_done,
4548         .rpc_release = nfs4_lock_release,
4549 };
4550
4551 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4552         .rpc_call_prepare = nfs4_recover_lock_prepare,
4553         .rpc_call_done = nfs4_lock_done,
4554         .rpc_release = nfs4_lock_release,
4555 };
4556
4557 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4558 {
4559         switch (error) {
4560         case -NFS4ERR_ADMIN_REVOKED:
4561         case -NFS4ERR_BAD_STATEID:
4562                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4563                 if (new_lock_owner != 0 ||
4564                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4565                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4566                 break;
4567         case -NFS4ERR_STALE_STATEID:
4568                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4569         case -NFS4ERR_EXPIRED:
4570                 nfs4_schedule_lease_recovery(server->nfs_client);
4571         };
4572 }
4573
4574 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4575 {
4576         struct nfs4_lockdata *data;
4577         struct rpc_task *task;
4578         struct rpc_message msg = {
4579                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4580                 .rpc_cred = state->owner->so_cred,
4581         };
4582         struct rpc_task_setup task_setup_data = {
4583                 .rpc_client = NFS_CLIENT(state->inode),
4584                 .rpc_message = &msg,
4585                 .callback_ops = &nfs4_lock_ops,
4586                 .workqueue = nfsiod_workqueue,
4587                 .flags = RPC_TASK_ASYNC,
4588         };
4589         int ret;
4590
4591         dprintk("%s: begin!\n", __func__);
4592         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4593                         fl->fl_u.nfs4_fl.owner,
4594                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4595         if (data == NULL)
4596                 return -ENOMEM;
4597         if (IS_SETLKW(cmd))
4598                 data->arg.block = 1;
4599         if (recovery_type > NFS_LOCK_NEW) {
4600                 if (recovery_type == NFS_LOCK_RECLAIM)
4601                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4602                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4603         }
4604         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4605         msg.rpc_argp = &data->arg;
4606         msg.rpc_resp = &data->res;
4607         task_setup_data.callback_data = data;
4608         task = rpc_run_task(&task_setup_data);
4609         if (IS_ERR(task))
4610                 return PTR_ERR(task);
4611         ret = nfs4_wait_for_completion_rpc_task(task);
4612         if (ret == 0) {
4613                 ret = data->rpc_status;
4614                 if (ret)
4615                         nfs4_handle_setlk_error(data->server, data->lsp,
4616                                         data->arg.new_lock_owner, ret);
4617         } else
4618                 data->cancelled = 1;
4619         rpc_put_task(task);
4620         dprintk("%s: done, ret = %d!\n", __func__, ret);
4621         return ret;
4622 }
4623
4624 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4625 {
4626         struct nfs_server *server = NFS_SERVER(state->inode);
4627         struct nfs4_exception exception = {
4628                 .inode = state->inode,
4629         };
4630         int err;
4631
4632         do {
4633                 /* Cache the lock if possible... */
4634                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4635                         return 0;
4636                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4637                 if (err != -NFS4ERR_DELAY)
4638                         break;
4639                 nfs4_handle_exception(server, err, &exception);
4640         } while (exception.retry);
4641         return err;
4642 }
4643
4644 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4645 {
4646         struct nfs_server *server = NFS_SERVER(state->inode);
4647         struct nfs4_exception exception = {
4648                 .inode = state->inode,
4649         };
4650         int err;
4651
4652         err = nfs4_set_lock_state(state, request);
4653         if (err != 0)
4654                 return err;
4655         do {
4656                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4657                         return 0;
4658                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4659                 switch (err) {
4660                 default:
4661                         goto out;
4662                 case -NFS4ERR_GRACE:
4663                 case -NFS4ERR_DELAY:
4664                         nfs4_handle_exception(server, err, &exception);
4665                         err = 0;
4666                 }
4667         } while (exception.retry);
4668 out:
4669         return err;
4670 }
4671
4672 #if defined(CONFIG_NFS_V4_1)
4673 static int nfs41_check_expired_locks(struct nfs4_state *state)
4674 {
4675         int status, ret = NFS_OK;
4676         struct nfs4_lock_state *lsp;
4677         struct nfs_server *server = NFS_SERVER(state->inode);
4678
4679         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4680                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4681                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4682                         if (status != NFS_OK) {
4683                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4684                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4685                                 ret = status;
4686                         }
4687                 }
4688         };
4689
4690         return ret;
4691 }
4692
4693 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4694 {
4695         int status = NFS_OK;
4696
4697         if (test_bit(LK_STATE_IN_USE, &state->flags))
4698                 status = nfs41_check_expired_locks(state);
4699         if (status == NFS_OK)
4700                 return status;
4701         return nfs4_lock_expired(state, request);
4702 }
4703 #endif
4704
4705 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4706 {
4707         struct nfs_inode *nfsi = NFS_I(state->inode);
4708         unsigned char fl_flags = request->fl_flags;
4709         int status = -ENOLCK;
4710
4711         if ((fl_flags & FL_POSIX) &&
4712                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4713                 goto out;
4714         /* Is this a delegated open? */
4715         status = nfs4_set_lock_state(state, request);
4716         if (status != 0)
4717                 goto out;
4718         request->fl_flags |= FL_ACCESS;
4719         status = do_vfs_lock(request->fl_file, request);
4720         if (status < 0)
4721                 goto out;
4722         down_read(&nfsi->rwsem);
4723         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4724                 /* Yes: cache locks! */
4725                 /* ...but avoid races with delegation recall... */
4726                 request->fl_flags = fl_flags & ~FL_SLEEP;
4727                 status = do_vfs_lock(request->fl_file, request);
4728                 goto out_unlock;
4729         }
4730         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4731         if (status != 0)
4732                 goto out_unlock;
4733         /* Note: we always want to sleep here! */
4734         request->fl_flags = fl_flags | FL_SLEEP;
4735         if (do_vfs_lock(request->fl_file, request) < 0)
4736                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4737                         "manager!\n", __func__);
4738 out_unlock:
4739         up_read(&nfsi->rwsem);
4740 out:
4741         request->fl_flags = fl_flags;
4742         return status;
4743 }
4744
4745 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4746 {
4747         struct nfs4_exception exception = {
4748                 .state = state,
4749                 .inode = state->inode,
4750         };
4751         int err;
4752
4753         do {
4754                 err = _nfs4_proc_setlk(state, cmd, request);
4755                 if (err == -NFS4ERR_DENIED)
4756                         err = -EAGAIN;
4757                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4758                                 err, &exception);
4759         } while (exception.retry);
4760         return err;
4761 }
4762
4763 static int
4764 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4765 {
4766         struct nfs_open_context *ctx;
4767         struct nfs4_state *state;
4768         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4769         int status;
4770
4771         /* verify open state */
4772         ctx = nfs_file_open_context(filp);
4773         state = ctx->state;
4774
4775         if (request->fl_start < 0 || request->fl_end < 0)
4776                 return -EINVAL;
4777
4778         if (IS_GETLK(cmd)) {
4779                 if (state != NULL)
4780                         return nfs4_proc_getlk(state, F_GETLK, request);
4781                 return 0;
4782         }
4783
4784         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4785                 return -EINVAL;
4786
4787         if (request->fl_type == F_UNLCK) {
4788                 if (state != NULL)
4789                         return nfs4_proc_unlck(state, cmd, request);
4790                 return 0;
4791         }
4792
4793         if (state == NULL)
4794                 return -ENOLCK;
4795         /*
4796          * Don't rely on the VFS having checked the file open mode,
4797          * since it won't do this for flock() locks.
4798          */
4799         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4800         case F_RDLCK:
4801                 if (!(filp->f_mode & FMODE_READ))
4802                         return -EBADF;
4803                 break;
4804         case F_WRLCK:
4805                 if (!(filp->f_mode & FMODE_WRITE))
4806                         return -EBADF;
4807         }
4808
4809         do {
4810                 status = nfs4_proc_setlk(state, cmd, request);
4811                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4812                         break;
4813                 timeout = nfs4_set_lock_task_retry(timeout);
4814                 status = -ERESTARTSYS;
4815                 if (signalled())
4816                         break;
4817         } while(status < 0);
4818         return status;
4819 }
4820
4821 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4822 {
4823         struct nfs_server *server = NFS_SERVER(state->inode);
4824         struct nfs4_exception exception = { };
4825         int err;
4826
4827         err = nfs4_set_lock_state(state, fl);
4828         if (err != 0)
4829                 goto out;
4830         do {
4831                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4832                 switch (err) {
4833                         default:
4834                                 printk(KERN_ERR "NFS: %s: unhandled error "
4835                                         "%d.\n", __func__, err);
4836                         case 0:
4837                         case -ESTALE:
4838                                 goto out;
4839                         case -NFS4ERR_EXPIRED:
4840                                 nfs4_schedule_stateid_recovery(server, state);
4841                         case -NFS4ERR_STALE_CLIENTID:
4842                         case -NFS4ERR_STALE_STATEID:
4843                                 nfs4_schedule_lease_recovery(server->nfs_client);
4844                                 goto out;
4845                         case -NFS4ERR_BADSESSION:
4846                         case -NFS4ERR_BADSLOT:
4847                         case -NFS4ERR_BAD_HIGH_SLOT:
4848                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4849                         case -NFS4ERR_DEADSESSION:
4850                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4851                                 goto out;
4852                         case -ERESTARTSYS:
4853                                 /*
4854                                  * The show must go on: exit, but mark the
4855                                  * stateid as needing recovery.
4856                                  */
4857                         case -NFS4ERR_DELEG_REVOKED:
4858                         case -NFS4ERR_ADMIN_REVOKED:
4859                         case -NFS4ERR_BAD_STATEID:
4860                         case -NFS4ERR_OPENMODE:
4861                                 nfs4_schedule_stateid_recovery(server, state);
4862                                 err = 0;
4863                                 goto out;
4864                         case -EKEYEXPIRED:
4865                                 /*
4866                                  * User RPCSEC_GSS context has expired.
4867                                  * We cannot recover this stateid now, so
4868                                  * skip it and allow recovery thread to
4869                                  * proceed.
4870                                  */
4871                                 err = 0;
4872                                 goto out;
4873                         case -ENOMEM:
4874                         case -NFS4ERR_DENIED:
4875                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4876                                 err = 0;
4877                                 goto out;
4878                         case -NFS4ERR_DELAY:
4879                                 break;
4880                 }
4881                 err = nfs4_handle_exception(server, err, &exception);
4882         } while (exception.retry);
4883 out:
4884         return err;
4885 }
4886
4887 struct nfs_release_lockowner_data {
4888         struct nfs4_lock_state *lsp;
4889         struct nfs_server *server;
4890         struct nfs_release_lockowner_args args;
4891 };
4892
4893 static void nfs4_release_lockowner_release(void *calldata)
4894 {
4895         struct nfs_release_lockowner_data *data = calldata;
4896         nfs4_free_lock_state(data->server, data->lsp);
4897         kfree(calldata);
4898 }
4899
4900 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4901         .rpc_release = nfs4_release_lockowner_release,
4902 };
4903
4904 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4905 {
4906         struct nfs_server *server = lsp->ls_state->owner->so_server;
4907         struct nfs_release_lockowner_data *data;
4908         struct rpc_message msg = {
4909                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4910         };
4911
4912         if (server->nfs_client->cl_mvops->minor_version != 0)
4913                 return -EINVAL;
4914         data = kmalloc(sizeof(*data), GFP_NOFS);
4915         if (!data)
4916                 return -ENOMEM;
4917         data->lsp = lsp;
4918         data->server = server;
4919         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4920         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4921         data->args.lock_owner.s_dev = server->s_dev;
4922         msg.rpc_argp = &data->args;
4923         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4924         return 0;
4925 }
4926
4927 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4928
4929 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4930                                    const void *buf, size_t buflen,
4931                                    int flags, int type)
4932 {
4933         if (strcmp(key, "") != 0)
4934                 return -EINVAL;
4935
4936         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4937 }
4938
4939 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4940                                    void *buf, size_t buflen, int type)
4941 {
4942         if (strcmp(key, "") != 0)
4943                 return -EINVAL;
4944
4945         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4946 }
4947
4948 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4949                                        size_t list_len, const char *name,
4950                                        size_t name_len, int type)
4951 {
4952         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4953
4954         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4955                 return 0;
4956
4957         if (list && len <= list_len)
4958                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4959         return len;
4960 }
4961
4962 /*
4963  * nfs_fhget will use either the mounted_on_fileid or the fileid
4964  */
4965 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4966 {
4967         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4968                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4969               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4970               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4971                 return;
4972
4973         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4974                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4975         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4976         fattr->nlink = 2;
4977 }
4978
4979 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4980                                    const struct qstr *name,
4981                                    struct nfs4_fs_locations *fs_locations,
4982                                    struct page *page)
4983 {
4984         struct nfs_server *server = NFS_SERVER(dir);
4985         u32 bitmask[2] = {
4986                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4987         };
4988         struct nfs4_fs_locations_arg args = {
4989                 .dir_fh = NFS_FH(dir),
4990                 .name = name,
4991                 .page = page,
4992                 .bitmask = bitmask,
4993         };
4994         struct nfs4_fs_locations_res res = {
4995                 .fs_locations = fs_locations,
4996         };
4997         struct rpc_message msg = {
4998                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4999                 .rpc_argp = &args,
5000                 .rpc_resp = &res,
5001         };
5002         int status;
5003
5004         dprintk("%s: start\n", __func__);
5005
5006         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5007          * is not supported */
5008         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5009                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5010         else
5011                 bitmask[0] |= FATTR4_WORD0_FILEID;
5012
5013         nfs_fattr_init(&fs_locations->fattr);
5014         fs_locations->server = server;
5015         fs_locations->nlocations = 0;
5016         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5017         dprintk("%s: returned status = %d\n", __func__, status);
5018         return status;
5019 }
5020
5021 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5022                            const struct qstr *name,
5023                            struct nfs4_fs_locations *fs_locations,
5024                            struct page *page)
5025 {
5026         struct nfs4_exception exception = { };
5027         int err;
5028         do {
5029                 err = nfs4_handle_exception(NFS_SERVER(dir),
5030                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5031                                 &exception);
5032         } while (exception.retry);
5033         return err;
5034 }
5035
5036 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5037 {
5038         int status;
5039         struct nfs4_secinfo_arg args = {
5040                 .dir_fh = NFS_FH(dir),
5041                 .name   = name,
5042         };
5043         struct nfs4_secinfo_res res = {
5044                 .flavors     = flavors,
5045         };
5046         struct rpc_message msg = {
5047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5048                 .rpc_argp = &args,
5049                 .rpc_resp = &res,
5050         };
5051
5052         dprintk("NFS call  secinfo %s\n", name->name);
5053         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5054         dprintk("NFS reply  secinfo: %d\n", status);
5055         return status;
5056 }
5057
5058 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5059                       struct nfs4_secinfo_flavors *flavors)
5060 {
5061         struct nfs4_exception exception = { };
5062         int err;
5063         do {
5064                 err = nfs4_handle_exception(NFS_SERVER(dir),
5065                                 _nfs4_proc_secinfo(dir, name, flavors),
5066                                 &exception);
5067         } while (exception.retry);
5068         return err;
5069 }
5070
5071 #ifdef CONFIG_NFS_V4_1
5072 /*
5073  * Check the exchange flags returned by the server for invalid flags, having
5074  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5075  * DS flags set.
5076  */
5077 static int nfs4_check_cl_exchange_flags(u32 flags)
5078 {
5079         if (flags & ~EXCHGID4_FLAG_MASK_R)
5080                 goto out_inval;
5081         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5082             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5083                 goto out_inval;
5084         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5085                 goto out_inval;
5086         return NFS_OK;
5087 out_inval:
5088         return -NFS4ERR_INVAL;
5089 }
5090
5091 static bool
5092 nfs41_same_server_scope(struct nfs41_server_scope *a,
5093                         struct nfs41_server_scope *b)
5094 {
5095         if (a->server_scope_sz == b->server_scope_sz &&
5096             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5097                 return true;
5098
5099         return false;
5100 }
5101
5102 /*
5103  * nfs4_proc_bind_conn_to_session()
5104  *
5105  * The 4.1 client currently uses the same TCP connection for the
5106  * fore and backchannel.
5107  */
5108 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp)
5109 {
5110         int status;
5111         struct nfs41_bind_conn_to_session_res res;
5112         struct rpc_message msg = {
5113                 .rpc_proc =
5114                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5115                 .rpc_argp = clp,
5116                 .rpc_resp = &res,
5117         };
5118
5119         dprintk("--> %s\n", __func__);
5120         BUG_ON(clp == NULL);
5121
5122         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5123         if (unlikely(res.session == NULL)) {
5124                 status = -ENOMEM;
5125                 goto out;
5126         }
5127
5128         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5129         if (status == 0) {
5130                 if (memcmp(res.session->sess_id.data,
5131                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5132                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5133                         status = -EIO;
5134                         goto out_session;
5135                 }
5136                 if (res.dir != NFS4_CDFS4_BOTH) {
5137                         dprintk("NFS: %s: Unexpected direction from server\n",
5138                                 __func__);
5139                         status = -EIO;
5140                         goto out_session;
5141                 }
5142                 if (res.use_conn_in_rdma_mode) {
5143                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5144                                 __func__);
5145                         status = -EIO;
5146                         goto out_session;
5147                 }
5148         }
5149 out_session:
5150         kfree(res.session);
5151 out:
5152         dprintk("<-- %s status= %d\n", __func__, status);
5153         return status;
5154 }
5155
5156 /*
5157  * nfs4_proc_exchange_id()
5158  *
5159  * Since the clientid has expired, all compounds using sessions
5160  * associated with the stale clientid will be returning
5161  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5162  * be in some phase of session reset.
5163  */
5164 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5165 {
5166         nfs4_verifier verifier;
5167         struct nfs41_exchange_id_args args = {
5168                 .verifier = &verifier,
5169                 .client = clp,
5170                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5171         };
5172         struct nfs41_exchange_id_res res = {
5173                 .client = clp,
5174         };
5175         int status;
5176         struct rpc_message msg = {
5177                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5178                 .rpc_argp = &args,
5179                 .rpc_resp = &res,
5180                 .rpc_cred = cred,
5181         };
5182
5183         dprintk("--> %s\n", __func__);
5184         BUG_ON(clp == NULL);
5185
5186         nfs4_init_boot_verifier(clp, &verifier);
5187
5188         args.id_len = scnprintf(args.id, sizeof(args.id),
5189                                 "%s/%s/%u",
5190                                 clp->cl_ipaddr,
5191                                 clp->cl_rpcclient->cl_nodename,
5192                                 clp->cl_rpcclient->cl_auth->au_flavor);
5193
5194         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5195                                         GFP_KERNEL);
5196         if (unlikely(res.server_owner == NULL)) {
5197                 status = -ENOMEM;
5198                 goto out;
5199         }
5200
5201         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5202                                         GFP_KERNEL);
5203         if (unlikely(res.server_scope == NULL)) {
5204                 status = -ENOMEM;
5205                 goto out_server_owner;
5206         }
5207
5208         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
5209         if (unlikely(res.impl_id == NULL)) {
5210                 status = -ENOMEM;
5211                 goto out_server_scope;
5212         }
5213
5214         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5215         if (status == 0)
5216                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
5217
5218         if (status == 0) {
5219                 kfree(clp->cl_serverowner);
5220                 clp->cl_serverowner = res.server_owner;
5221                 res.server_owner = NULL;
5222         }
5223
5224         if (status == 0) {
5225                 /* use the most recent implementation id */
5226                 kfree(clp->cl_implid);
5227                 clp->cl_implid = res.impl_id;
5228         } else
5229                 kfree(res.impl_id);
5230
5231         if (status == 0) {
5232                 if (clp->cl_serverscope != NULL &&
5233                     !nfs41_same_server_scope(clp->cl_serverscope,
5234                                              res.server_scope)) {
5235                         dprintk("%s: server_scope mismatch detected\n",
5236                                 __func__);
5237                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5238                         kfree(clp->cl_serverscope);
5239                         clp->cl_serverscope = NULL;
5240                 }
5241
5242                 if (clp->cl_serverscope == NULL) {
5243                         clp->cl_serverscope = res.server_scope;
5244                         goto out;
5245                 }
5246         }
5247
5248 out_server_owner:
5249         kfree(res.server_owner);
5250 out_server_scope:
5251         kfree(res.server_scope);
5252 out:
5253         if (clp->cl_implid != NULL)
5254                 dprintk("%s: Server Implementation ID: "
5255                         "domain: %s, name: %s, date: %llu,%u\n",
5256                         __func__, clp->cl_implid->domain, clp->cl_implid->name,
5257                         clp->cl_implid->date.seconds,
5258                         clp->cl_implid->date.nseconds);
5259         dprintk("<-- %s status= %d\n", __func__, status);
5260         return status;
5261 }
5262
5263 struct nfs4_get_lease_time_data {
5264         struct nfs4_get_lease_time_args *args;
5265         struct nfs4_get_lease_time_res *res;
5266         struct nfs_client *clp;
5267 };
5268
5269 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5270                                         void *calldata)
5271 {
5272         int ret;
5273         struct nfs4_get_lease_time_data *data =
5274                         (struct nfs4_get_lease_time_data *)calldata;
5275
5276         dprintk("--> %s\n", __func__);
5277         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5278         /* just setup sequence, do not trigger session recovery
5279            since we're invoked within one */
5280         ret = nfs41_setup_sequence(data->clp->cl_session,
5281                                    &data->args->la_seq_args,
5282                                    &data->res->lr_seq_res, task);
5283
5284         BUG_ON(ret == -EAGAIN);
5285         rpc_call_start(task);
5286         dprintk("<-- %s\n", __func__);
5287 }
5288
5289 /*
5290  * Called from nfs4_state_manager thread for session setup, so don't recover
5291  * from sequence operation or clientid errors.
5292  */
5293 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5294 {
5295         struct nfs4_get_lease_time_data *data =
5296                         (struct nfs4_get_lease_time_data *)calldata;
5297
5298         dprintk("--> %s\n", __func__);
5299         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5300                 return;
5301         switch (task->tk_status) {
5302         case -NFS4ERR_DELAY:
5303         case -NFS4ERR_GRACE:
5304                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5305                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5306                 task->tk_status = 0;
5307                 /* fall through */
5308         case -NFS4ERR_RETRY_UNCACHED_REP:
5309                 rpc_restart_call_prepare(task);
5310                 return;
5311         }
5312         dprintk("<-- %s\n", __func__);
5313 }
5314
5315 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5316         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5317         .rpc_call_done = nfs4_get_lease_time_done,
5318 };
5319
5320 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5321 {
5322         struct rpc_task *task;
5323         struct nfs4_get_lease_time_args args;
5324         struct nfs4_get_lease_time_res res = {
5325                 .lr_fsinfo = fsinfo,
5326         };
5327         struct nfs4_get_lease_time_data data = {
5328                 .args = &args,
5329                 .res = &res,
5330                 .clp = clp,
5331         };
5332         struct rpc_message msg = {
5333                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5334                 .rpc_argp = &args,
5335                 .rpc_resp = &res,
5336         };
5337         struct rpc_task_setup task_setup = {
5338                 .rpc_client = clp->cl_rpcclient,
5339                 .rpc_message = &msg,
5340                 .callback_ops = &nfs4_get_lease_time_ops,
5341                 .callback_data = &data,
5342                 .flags = RPC_TASK_TIMEOUT,
5343         };
5344         int status;
5345
5346         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5347         dprintk("--> %s\n", __func__);
5348         task = rpc_run_task(&task_setup);
5349
5350         if (IS_ERR(task))
5351                 status = PTR_ERR(task);
5352         else {
5353                 status = task->tk_status;
5354                 rpc_put_task(task);
5355         }
5356         dprintk("<-- %s return %d\n", __func__, status);
5357
5358         return status;
5359 }
5360
5361 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5362 {
5363         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5364 }
5365
5366 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5367                 struct nfs4_slot *new,
5368                 u32 max_slots,
5369                 u32 ivalue)
5370 {
5371         struct nfs4_slot *old = NULL;
5372         u32 i;
5373
5374         spin_lock(&tbl->slot_tbl_lock);
5375         if (new) {
5376                 old = tbl->slots;
5377                 tbl->slots = new;
5378                 tbl->max_slots = max_slots;
5379         }
5380         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5381         for (i = 0; i < tbl->max_slots; i++)
5382                 tbl->slots[i].seq_nr = ivalue;
5383         spin_unlock(&tbl->slot_tbl_lock);
5384         kfree(old);
5385 }
5386
5387 /*
5388  * (re)Initialise a slot table
5389  */
5390 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5391                                  u32 ivalue)
5392 {
5393         struct nfs4_slot *new = NULL;
5394         int ret = -ENOMEM;
5395
5396         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5397                 max_reqs, tbl->max_slots);
5398
5399         /* Does the newly negotiated max_reqs match the existing slot table? */
5400         if (max_reqs != tbl->max_slots) {
5401                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5402                 if (!new)
5403                         goto out;
5404         }
5405         ret = 0;
5406
5407         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5408         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5409                 tbl, tbl->slots, tbl->max_slots);
5410 out:
5411         dprintk("<-- %s: return %d\n", __func__, ret);
5412         return ret;
5413 }
5414
5415 /* Destroy the slot table */
5416 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5417 {
5418         if (session->fc_slot_table.slots != NULL) {
5419                 kfree(session->fc_slot_table.slots);
5420                 session->fc_slot_table.slots = NULL;
5421         }
5422         if (session->bc_slot_table.slots != NULL) {
5423                 kfree(session->bc_slot_table.slots);
5424                 session->bc_slot_table.slots = NULL;
5425         }
5426         return;
5427 }
5428
5429 /*
5430  * Initialize or reset the forechannel and backchannel tables
5431  */
5432 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5433 {
5434         struct nfs4_slot_table *tbl;
5435         int status;
5436
5437         dprintk("--> %s\n", __func__);
5438         /* Fore channel */
5439         tbl = &ses->fc_slot_table;
5440         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5441         if (status) /* -ENOMEM */
5442                 return status;
5443         /* Back channel */
5444         tbl = &ses->bc_slot_table;
5445         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5446         if (status && tbl->slots == NULL)
5447                 /* Fore and back channel share a connection so get
5448                  * both slot tables or neither */
5449                 nfs4_destroy_slot_tables(ses);
5450         return status;
5451 }
5452
5453 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5454 {
5455         struct nfs4_session *session;
5456         struct nfs4_slot_table *tbl;
5457
5458         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5459         if (!session)
5460                 return NULL;
5461
5462         tbl = &session->fc_slot_table;
5463         tbl->highest_used_slotid = NFS4_NO_SLOT;
5464         spin_lock_init(&tbl->slot_tbl_lock);
5465         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5466         init_completion(&tbl->complete);
5467
5468         tbl = &session->bc_slot_table;
5469         tbl->highest_used_slotid = NFS4_NO_SLOT;
5470         spin_lock_init(&tbl->slot_tbl_lock);
5471         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5472         init_completion(&tbl->complete);
5473
5474         session->session_state = 1<<NFS4_SESSION_INITING;
5475
5476         session->clp = clp;
5477         return session;
5478 }
5479
5480 void nfs4_destroy_session(struct nfs4_session *session)
5481 {
5482         struct rpc_xprt *xprt;
5483
5484         nfs4_proc_destroy_session(session);
5485
5486         rcu_read_lock();
5487         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5488         rcu_read_unlock();
5489         dprintk("%s Destroy backchannel for xprt %p\n",
5490                 __func__, xprt);
5491         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5492         nfs4_destroy_slot_tables(session);
5493         kfree(session);
5494 }
5495
5496 /*
5497  * Initialize the values to be used by the client in CREATE_SESSION
5498  * If nfs4_init_session set the fore channel request and response sizes,
5499  * use them.
5500  *
5501  * Set the back channel max_resp_sz_cached to zero to force the client to
5502  * always set csa_cachethis to FALSE because the current implementation
5503  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5504  */
5505 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5506 {
5507         struct nfs4_session *session = args->client->cl_session;
5508         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5509                      mxresp_sz = session->fc_attrs.max_resp_sz;
5510
5511         if (mxrqst_sz == 0)
5512                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5513         if (mxresp_sz == 0)
5514                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5515         /* Fore channel attributes */
5516         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5517         args->fc_attrs.max_resp_sz = mxresp_sz;
5518         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5519         args->fc_attrs.max_reqs = max_session_slots;
5520
5521         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5522                 "max_ops=%u max_reqs=%u\n",
5523                 __func__,
5524                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5525                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5526
5527         /* Back channel attributes */
5528         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5529         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5530         args->bc_attrs.max_resp_sz_cached = 0;
5531         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5532         args->bc_attrs.max_reqs = 1;
5533
5534         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5535                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5536                 __func__,
5537                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5538                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5539                 args->bc_attrs.max_reqs);
5540 }
5541
5542 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5543 {
5544         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5545         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5546
5547         if (rcvd->max_resp_sz > sent->max_resp_sz)
5548                 return -EINVAL;
5549         /*
5550          * Our requested max_ops is the minimum we need; we're not
5551          * prepared to break up compounds into smaller pieces than that.
5552          * So, no point even trying to continue if the server won't
5553          * cooperate:
5554          */
5555         if (rcvd->max_ops < sent->max_ops)
5556                 return -EINVAL;
5557         if (rcvd->max_reqs == 0)
5558                 return -EINVAL;
5559         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5560                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5561         return 0;
5562 }
5563
5564 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5565 {
5566         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5567         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5568
5569         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5570                 return -EINVAL;
5571         if (rcvd->max_resp_sz < sent->max_resp_sz)
5572                 return -EINVAL;
5573         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5574                 return -EINVAL;
5575         /* These would render the backchannel useless: */
5576         if (rcvd->max_ops != sent->max_ops)
5577                 return -EINVAL;
5578         if (rcvd->max_reqs != sent->max_reqs)
5579                 return -EINVAL;
5580         return 0;
5581 }
5582
5583 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5584                                      struct nfs4_session *session)
5585 {
5586         int ret;
5587
5588         ret = nfs4_verify_fore_channel_attrs(args, session);
5589         if (ret)
5590                 return ret;
5591         return nfs4_verify_back_channel_attrs(args, session);
5592 }
5593
5594 static int _nfs4_proc_create_session(struct nfs_client *clp)
5595 {
5596         struct nfs4_session *session = clp->cl_session;
5597         struct nfs41_create_session_args args = {
5598                 .client = clp,
5599                 .cb_program = NFS4_CALLBACK,
5600         };
5601         struct nfs41_create_session_res res = {
5602                 .client = clp,
5603         };
5604         struct rpc_message msg = {
5605                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5606                 .rpc_argp = &args,
5607                 .rpc_resp = &res,
5608         };
5609         int status;
5610
5611         nfs4_init_channel_attrs(&args);
5612         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5613
5614         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5615
5616         if (!status)
5617                 /* Verify the session's negotiated channel_attrs values */
5618                 status = nfs4_verify_channel_attrs(&args, session);
5619         if (!status) {
5620                 /* Increment the clientid slot sequence id */
5621                 clp->cl_seqid++;
5622         }
5623
5624         return status;
5625 }
5626
5627 /*
5628  * Issues a CREATE_SESSION operation to the server.
5629  * It is the responsibility of the caller to verify the session is
5630  * expired before calling this routine.
5631  */
5632 int nfs4_proc_create_session(struct nfs_client *clp)
5633 {
5634         int status;
5635         unsigned *ptr;
5636         struct nfs4_session *session = clp->cl_session;
5637
5638         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5639
5640         status = _nfs4_proc_create_session(clp);
5641         if (status)
5642                 goto out;
5643
5644         /* Init or reset the session slot tables */
5645         status = nfs4_setup_session_slot_tables(session);
5646         dprintk("slot table setup returned %d\n", status);
5647         if (status)
5648                 goto out;
5649
5650         ptr = (unsigned *)&session->sess_id.data[0];
5651         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5652                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5653 out:
5654         dprintk("<-- %s\n", __func__);
5655         return status;
5656 }
5657
5658 /*
5659  * Issue the over-the-wire RPC DESTROY_SESSION.
5660  * The caller must serialize access to this routine.
5661  */
5662 int nfs4_proc_destroy_session(struct nfs4_session *session)
5663 {
5664         int status = 0;
5665         struct rpc_message msg;
5666
5667         dprintk("--> nfs4_proc_destroy_session\n");
5668
5669         /* session is still being setup */
5670         if (session->clp->cl_cons_state != NFS_CS_READY)
5671                 return status;
5672
5673         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5674         msg.rpc_argp = session;
5675         msg.rpc_resp = NULL;
5676         msg.rpc_cred = NULL;
5677         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5678
5679         if (status)
5680                 printk(KERN_WARNING
5681                         "NFS: Got error %d from the server on DESTROY_SESSION. "
5682                         "Session has been destroyed regardless...\n", status);
5683
5684         dprintk("<-- nfs4_proc_destroy_session\n");
5685         return status;
5686 }
5687
5688 /*
5689  * With sessions, the client is not marked ready until after a
5690  * successful EXCHANGE_ID and CREATE_SESSION.
5691  *
5692  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5693  * other versions of NFS can be tried.
5694  */
5695 static int nfs41_check_session_ready(struct nfs_client *clp)
5696 {
5697         int ret;
5698
5699         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
5700                 ret = nfs4_client_recover_expired_lease(clp);
5701                 if (ret)
5702                         return ret;
5703         }
5704         if (clp->cl_cons_state < NFS_CS_READY)
5705                 return -EPROTONOSUPPORT;
5706         smp_rmb();
5707         return 0;
5708 }
5709
5710 int nfs4_init_session(struct nfs_server *server)
5711 {
5712         struct nfs_client *clp = server->nfs_client;
5713         struct nfs4_session *session;
5714         unsigned int rsize, wsize;
5715
5716         if (!nfs4_has_session(clp))
5717                 return 0;
5718
5719         session = clp->cl_session;
5720         spin_lock(&clp->cl_lock);
5721         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5722
5723                 rsize = server->rsize;
5724                 if (rsize == 0)
5725                         rsize = NFS_MAX_FILE_IO_SIZE;
5726                 wsize = server->wsize;
5727                 if (wsize == 0)
5728                         wsize = NFS_MAX_FILE_IO_SIZE;
5729
5730                 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5731                 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5732         }
5733         spin_unlock(&clp->cl_lock);
5734
5735         return nfs41_check_session_ready(clp);
5736 }
5737
5738 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
5739 {
5740         struct nfs4_session *session = clp->cl_session;
5741         int ret;
5742
5743         spin_lock(&clp->cl_lock);
5744         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5745                 /*
5746                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
5747                  * DS lease to be equal to the MDS lease.
5748                  */
5749                 clp->cl_lease_time = lease_time;
5750                 clp->cl_last_renewal = jiffies;
5751         }
5752         spin_unlock(&clp->cl_lock);
5753
5754         ret = nfs41_check_session_ready(clp);
5755         if (ret)
5756                 return ret;
5757         /* Test for the DS role */
5758         if (!is_ds_client(clp))
5759                 return -ENODEV;
5760         return 0;
5761 }
5762 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5763
5764
5765 /*
5766  * Renew the cl_session lease.
5767  */
5768 struct nfs4_sequence_data {
5769         struct nfs_client *clp;
5770         struct nfs4_sequence_args args;
5771         struct nfs4_sequence_res res;
5772 };
5773
5774 static void nfs41_sequence_release(void *data)
5775 {
5776         struct nfs4_sequence_data *calldata = data;
5777         struct nfs_client *clp = calldata->clp;
5778
5779         if (atomic_read(&clp->cl_count) > 1)
5780                 nfs4_schedule_state_renewal(clp);
5781         nfs_put_client(clp);
5782         kfree(calldata);
5783 }
5784
5785 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5786 {
5787         switch(task->tk_status) {
5788         case -NFS4ERR_DELAY:
5789                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5790                 return -EAGAIN;
5791         default:
5792                 nfs4_schedule_lease_recovery(clp);
5793         }
5794         return 0;
5795 }
5796
5797 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5798 {
5799         struct nfs4_sequence_data *calldata = data;
5800         struct nfs_client *clp = calldata->clp;
5801
5802         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5803                 return;
5804
5805         if (task->tk_status < 0) {
5806                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5807                 if (atomic_read(&clp->cl_count) == 1)
5808                         goto out;
5809
5810                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5811                         rpc_restart_call_prepare(task);
5812                         return;
5813                 }
5814         }
5815         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5816 out:
5817         dprintk("<-- %s\n", __func__);
5818 }
5819
5820 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5821 {
5822         struct nfs4_sequence_data *calldata = data;
5823         struct nfs_client *clp = calldata->clp;
5824         struct nfs4_sequence_args *args;
5825         struct nfs4_sequence_res *res;
5826
5827         args = task->tk_msg.rpc_argp;
5828         res = task->tk_msg.rpc_resp;
5829
5830         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5831                 return;
5832         rpc_call_start(task);
5833 }
5834
5835 static const struct rpc_call_ops nfs41_sequence_ops = {
5836         .rpc_call_done = nfs41_sequence_call_done,
5837         .rpc_call_prepare = nfs41_sequence_prepare,
5838         .rpc_release = nfs41_sequence_release,
5839 };
5840
5841 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5842 {
5843         struct nfs4_sequence_data *calldata;
5844         struct rpc_message msg = {
5845                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5846                 .rpc_cred = cred,
5847         };
5848         struct rpc_task_setup task_setup_data = {
5849                 .rpc_client = clp->cl_rpcclient,
5850                 .rpc_message = &msg,
5851                 .callback_ops = &nfs41_sequence_ops,
5852                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5853         };
5854
5855         if (!atomic_inc_not_zero(&clp->cl_count))
5856                 return ERR_PTR(-EIO);
5857         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5858         if (calldata == NULL) {
5859                 nfs_put_client(clp);
5860                 return ERR_PTR(-ENOMEM);
5861         }
5862         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5863         msg.rpc_argp = &calldata->args;
5864         msg.rpc_resp = &calldata->res;
5865         calldata->clp = clp;
5866         task_setup_data.callback_data = calldata;
5867
5868         return rpc_run_task(&task_setup_data);
5869 }
5870
5871 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5872 {
5873         struct rpc_task *task;
5874         int ret = 0;
5875
5876         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5877                 return 0;
5878         task = _nfs41_proc_sequence(clp, cred);
5879         if (IS_ERR(task))
5880                 ret = PTR_ERR(task);
5881         else
5882                 rpc_put_task_async(task);
5883         dprintk("<-- %s status=%d\n", __func__, ret);
5884         return ret;
5885 }
5886
5887 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5888 {
5889         struct rpc_task *task;
5890         int ret;
5891
5892         task = _nfs41_proc_sequence(clp, cred);
5893         if (IS_ERR(task)) {
5894                 ret = PTR_ERR(task);
5895                 goto out;
5896         }
5897         ret = rpc_wait_for_completion_task(task);
5898         if (!ret) {
5899                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5900
5901                 if (task->tk_status == 0)
5902                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5903                 ret = task->tk_status;
5904         }
5905         rpc_put_task(task);
5906 out:
5907         dprintk("<-- %s status=%d\n", __func__, ret);
5908         return ret;
5909 }
5910
5911 struct nfs4_reclaim_complete_data {
5912         struct nfs_client *clp;
5913         struct nfs41_reclaim_complete_args arg;
5914         struct nfs41_reclaim_complete_res res;
5915 };
5916
5917 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5918 {
5919         struct nfs4_reclaim_complete_data *calldata = data;
5920
5921         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5922         if (nfs41_setup_sequence(calldata->clp->cl_session,
5923                                 &calldata->arg.seq_args,
5924                                 &calldata->res.seq_res, task))
5925                 return;
5926
5927         rpc_call_start(task);
5928 }
5929
5930 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5931 {
5932         switch(task->tk_status) {
5933         case 0:
5934         case -NFS4ERR_COMPLETE_ALREADY:
5935         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5936                 break;
5937         case -NFS4ERR_DELAY:
5938                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5939                 /* fall through */
5940         case -NFS4ERR_RETRY_UNCACHED_REP:
5941                 return -EAGAIN;
5942         default:
5943                 nfs4_schedule_lease_recovery(clp);
5944         }
5945         return 0;
5946 }
5947
5948 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5949 {
5950         struct nfs4_reclaim_complete_data *calldata = data;
5951         struct nfs_client *clp = calldata->clp;
5952         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5953
5954         dprintk("--> %s\n", __func__);
5955         if (!nfs41_sequence_done(task, res))
5956                 return;
5957
5958         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5959                 rpc_restart_call_prepare(task);
5960                 return;
5961         }
5962         dprintk("<-- %s\n", __func__);
5963 }
5964
5965 static void nfs4_free_reclaim_complete_data(void *data)
5966 {
5967         struct nfs4_reclaim_complete_data *calldata = data;
5968
5969         kfree(calldata);
5970 }
5971
5972 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5973         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5974         .rpc_call_done = nfs4_reclaim_complete_done,
5975         .rpc_release = nfs4_free_reclaim_complete_data,
5976 };
5977
5978 /*
5979  * Issue a global reclaim complete.
5980  */
5981 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5982 {
5983         struct nfs4_reclaim_complete_data *calldata;
5984         struct rpc_task *task;
5985         struct rpc_message msg = {
5986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5987         };
5988         struct rpc_task_setup task_setup_data = {
5989                 .rpc_client = clp->cl_rpcclient,
5990                 .rpc_message = &msg,
5991                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5992                 .flags = RPC_TASK_ASYNC,
5993         };
5994         int status = -ENOMEM;
5995
5996         dprintk("--> %s\n", __func__);
5997         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5998         if (calldata == NULL)
5999                 goto out;
6000         calldata->clp = clp;
6001         calldata->arg.one_fs = 0;
6002
6003         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6004         msg.rpc_argp = &calldata->arg;
6005         msg.rpc_resp = &calldata->res;
6006         task_setup_data.callback_data = calldata;
6007         task = rpc_run_task(&task_setup_data);
6008         if (IS_ERR(task)) {
6009                 status = PTR_ERR(task);
6010                 goto out;
6011         }
6012         status = nfs4_wait_for_completion_rpc_task(task);
6013         if (status == 0)
6014                 status = task->tk_status;
6015         rpc_put_task(task);
6016         return 0;
6017 out:
6018         dprintk("<-- %s status=%d\n", __func__, status);
6019         return status;
6020 }
6021
6022 static void
6023 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6024 {
6025         struct nfs4_layoutget *lgp = calldata;
6026         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6027
6028         dprintk("--> %s\n", __func__);
6029         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6030          * right now covering the LAYOUTGET we are about to send.
6031          * However, that is not so catastrophic, and there seems
6032          * to be no way to prevent it completely.
6033          */
6034         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6035                                 &lgp->res.seq_res, task))
6036                 return;
6037         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6038                                           NFS_I(lgp->args.inode)->layout,
6039                                           lgp->args.ctx->state)) {
6040                 rpc_exit(task, NFS4_OK);
6041                 return;
6042         }
6043         rpc_call_start(task);
6044 }
6045
6046 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6047 {
6048         struct nfs4_layoutget *lgp = calldata;
6049         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6050
6051         dprintk("--> %s\n", __func__);
6052
6053         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6054                 return;
6055
6056         switch (task->tk_status) {
6057         case 0:
6058                 break;
6059         case -NFS4ERR_LAYOUTTRYLATER:
6060         case -NFS4ERR_RECALLCONFLICT:
6061                 task->tk_status = -NFS4ERR_DELAY;
6062                 /* Fall through */
6063         default:
6064                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6065                         rpc_restart_call_prepare(task);
6066                         return;
6067                 }
6068         }
6069         dprintk("<-- %s\n", __func__);
6070 }
6071
6072 static void nfs4_layoutget_release(void *calldata)
6073 {
6074         struct nfs4_layoutget *lgp = calldata;
6075
6076         dprintk("--> %s\n", __func__);
6077         put_nfs_open_context(lgp->args.ctx);
6078         kfree(calldata);
6079         dprintk("<-- %s\n", __func__);
6080 }
6081
6082 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6083         .rpc_call_prepare = nfs4_layoutget_prepare,
6084         .rpc_call_done = nfs4_layoutget_done,
6085         .rpc_release = nfs4_layoutget_release,
6086 };
6087
6088 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
6089 {
6090         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6091         struct rpc_task *task;
6092         struct rpc_message msg = {
6093                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6094                 .rpc_argp = &lgp->args,
6095                 .rpc_resp = &lgp->res,
6096         };
6097         struct rpc_task_setup task_setup_data = {
6098                 .rpc_client = server->client,
6099                 .rpc_message = &msg,
6100                 .callback_ops = &nfs4_layoutget_call_ops,
6101                 .callback_data = lgp,
6102                 .flags = RPC_TASK_ASYNC,
6103         };
6104         int status = 0;
6105
6106         dprintk("--> %s\n", __func__);
6107
6108         lgp->res.layoutp = &lgp->args.layout;
6109         lgp->res.seq_res.sr_slot = NULL;
6110         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6111         task = rpc_run_task(&task_setup_data);
6112         if (IS_ERR(task))
6113                 return PTR_ERR(task);
6114         status = nfs4_wait_for_completion_rpc_task(task);
6115         if (status == 0)
6116                 status = task->tk_status;
6117         if (status == 0)
6118                 status = pnfs_layout_process(lgp);
6119         rpc_put_task(task);
6120         dprintk("<-- %s status=%d\n", __func__, status);
6121         return status;
6122 }
6123
6124 static void
6125 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6126 {
6127         struct nfs4_layoutreturn *lrp = calldata;
6128
6129         dprintk("--> %s\n", __func__);
6130         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6131                                 &lrp->res.seq_res, task))
6132                 return;
6133         rpc_call_start(task);
6134 }
6135
6136 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6137 {
6138         struct nfs4_layoutreturn *lrp = calldata;
6139         struct nfs_server *server;
6140         struct pnfs_layout_hdr *lo = lrp->args.layout;
6141
6142         dprintk("--> %s\n", __func__);
6143
6144         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6145                 return;
6146
6147         server = NFS_SERVER(lrp->args.inode);
6148         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6149                 rpc_restart_call_prepare(task);
6150                 return;
6151         }
6152         spin_lock(&lo->plh_inode->i_lock);
6153         if (task->tk_status == 0) {
6154                 if (lrp->res.lrs_present) {
6155                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6156                 } else
6157                         BUG_ON(!list_empty(&lo->plh_segs));
6158         }
6159         lo->plh_block_lgets--;
6160         spin_unlock(&lo->plh_inode->i_lock);
6161         dprintk("<-- %s\n", __func__);
6162 }
6163
6164 static void nfs4_layoutreturn_release(void *calldata)
6165 {
6166         struct nfs4_layoutreturn *lrp = calldata;
6167
6168         dprintk("--> %s\n", __func__);
6169         put_layout_hdr(lrp->args.layout);
6170         kfree(calldata);
6171         dprintk("<-- %s\n", __func__);
6172 }
6173
6174 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6175         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6176         .rpc_call_done = nfs4_layoutreturn_done,
6177         .rpc_release = nfs4_layoutreturn_release,
6178 };
6179
6180 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6181 {
6182         struct rpc_task *task;
6183         struct rpc_message msg = {
6184                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6185                 .rpc_argp = &lrp->args,
6186                 .rpc_resp = &lrp->res,
6187         };
6188         struct rpc_task_setup task_setup_data = {
6189                 .rpc_client = lrp->clp->cl_rpcclient,
6190                 .rpc_message = &msg,
6191                 .callback_ops = &nfs4_layoutreturn_call_ops,
6192                 .callback_data = lrp,
6193         };
6194         int status;
6195
6196         dprintk("--> %s\n", __func__);
6197         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6198         task = rpc_run_task(&task_setup_data);
6199         if (IS_ERR(task))
6200                 return PTR_ERR(task);
6201         status = task->tk_status;
6202         dprintk("<-- %s status=%d\n", __func__, status);
6203         rpc_put_task(task);
6204         return status;
6205 }
6206
6207 /*
6208  * Retrieve the list of Data Server devices from the MDS.
6209  */
6210 static int _nfs4_getdevicelist(struct nfs_server *server,
6211                                     const struct nfs_fh *fh,
6212                                     struct pnfs_devicelist *devlist)
6213 {
6214         struct nfs4_getdevicelist_args args = {
6215                 .fh = fh,
6216                 .layoutclass = server->pnfs_curr_ld->id,
6217         };
6218         struct nfs4_getdevicelist_res res = {
6219                 .devlist = devlist,
6220         };
6221         struct rpc_message msg = {
6222                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6223                 .rpc_argp = &args,
6224                 .rpc_resp = &res,
6225         };
6226         int status;
6227
6228         dprintk("--> %s\n", __func__);
6229         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6230                                 &res.seq_res, 0);
6231         dprintk("<-- %s status=%d\n", __func__, status);
6232         return status;
6233 }
6234
6235 int nfs4_proc_getdevicelist(struct nfs_server *server,
6236                             const struct nfs_fh *fh,
6237                             struct pnfs_devicelist *devlist)
6238 {
6239         struct nfs4_exception exception = { };
6240         int err;
6241
6242         do {
6243                 err = nfs4_handle_exception(server,
6244                                 _nfs4_getdevicelist(server, fh, devlist),
6245                                 &exception);
6246         } while (exception.retry);
6247
6248         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6249                 err, devlist->num_devs);
6250
6251         return err;
6252 }
6253 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6254
6255 static int
6256 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6257 {
6258         struct nfs4_getdeviceinfo_args args = {
6259                 .pdev = pdev,
6260         };
6261         struct nfs4_getdeviceinfo_res res = {
6262                 .pdev = pdev,
6263         };
6264         struct rpc_message msg = {
6265                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6266                 .rpc_argp = &args,
6267                 .rpc_resp = &res,
6268         };
6269         int status;
6270
6271         dprintk("--> %s\n", __func__);
6272         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6273         dprintk("<-- %s status=%d\n", __func__, status);
6274
6275         return status;
6276 }
6277
6278 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6279 {
6280         struct nfs4_exception exception = { };
6281         int err;
6282
6283         do {
6284                 err = nfs4_handle_exception(server,
6285                                         _nfs4_proc_getdeviceinfo(server, pdev),
6286                                         &exception);
6287         } while (exception.retry);
6288         return err;
6289 }
6290 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6291
6292 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6293 {
6294         struct nfs4_layoutcommit_data *data = calldata;
6295         struct nfs_server *server = NFS_SERVER(data->args.inode);
6296
6297         if (nfs4_setup_sequence(server, &data->args.seq_args,
6298                                 &data->res.seq_res, task))
6299                 return;
6300         rpc_call_start(task);
6301 }
6302
6303 static void
6304 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6305 {
6306         struct nfs4_layoutcommit_data *data = calldata;
6307         struct nfs_server *server = NFS_SERVER(data->args.inode);
6308
6309         if (!nfs4_sequence_done(task, &data->res.seq_res))
6310                 return;
6311
6312         switch (task->tk_status) { /* Just ignore these failures */
6313         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6314         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6315         case -NFS4ERR_BADLAYOUT:     /* no layout */
6316         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6317                 task->tk_status = 0;
6318                 break;
6319         case 0:
6320                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6321                                                    data->res.fattr);
6322                 break;
6323         default:
6324                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6325                         rpc_restart_call_prepare(task);
6326                         return;
6327                 }
6328         }
6329 }
6330
6331 static void nfs4_layoutcommit_release(void *calldata)
6332 {
6333         struct nfs4_layoutcommit_data *data = calldata;
6334         struct pnfs_layout_segment *lseg, *tmp;
6335         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6336
6337         pnfs_cleanup_layoutcommit(data);
6338         /* Matched by references in pnfs_set_layoutcommit */
6339         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6340                 list_del_init(&lseg->pls_lc_list);
6341                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6342                                        &lseg->pls_flags))
6343                         put_lseg(lseg);
6344         }
6345
6346         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6347         smp_mb__after_clear_bit();
6348         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6349
6350         put_rpccred(data->cred);
6351         kfree(data);
6352 }
6353
6354 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6355         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6356         .rpc_call_done = nfs4_layoutcommit_done,
6357         .rpc_release = nfs4_layoutcommit_release,
6358 };
6359
6360 int
6361 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6362 {
6363         struct rpc_message msg = {
6364                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6365                 .rpc_argp = &data->args,
6366                 .rpc_resp = &data->res,
6367                 .rpc_cred = data->cred,
6368         };
6369         struct rpc_task_setup task_setup_data = {
6370                 .task = &data->task,
6371                 .rpc_client = NFS_CLIENT(data->args.inode),
6372                 .rpc_message = &msg,
6373                 .callback_ops = &nfs4_layoutcommit_ops,
6374                 .callback_data = data,
6375                 .flags = RPC_TASK_ASYNC,
6376         };
6377         struct rpc_task *task;
6378         int status = 0;
6379
6380         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6381                 "lbw: %llu inode %lu\n",
6382                 data->task.tk_pid, sync,
6383                 data->args.lastbytewritten,
6384                 data->args.inode->i_ino);
6385
6386         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6387         task = rpc_run_task(&task_setup_data);
6388         if (IS_ERR(task))
6389                 return PTR_ERR(task);
6390         if (sync == false)
6391                 goto out;
6392         status = nfs4_wait_for_completion_rpc_task(task);
6393         if (status != 0)
6394                 goto out;
6395         status = task->tk_status;
6396 out:
6397         dprintk("%s: status %d\n", __func__, status);
6398         rpc_put_task(task);
6399         return status;
6400 }
6401
6402 static int
6403 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6404                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6405 {
6406         struct nfs41_secinfo_no_name_args args = {
6407                 .style = SECINFO_STYLE_CURRENT_FH,
6408         };
6409         struct nfs4_secinfo_res res = {
6410                 .flavors = flavors,
6411         };
6412         struct rpc_message msg = {
6413                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6414                 .rpc_argp = &args,
6415                 .rpc_resp = &res,
6416         };
6417         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6418 }
6419
6420 static int
6421 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6422                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6423 {
6424         struct nfs4_exception exception = { };
6425         int err;
6426         do {
6427                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6428                 switch (err) {
6429                 case 0:
6430                 case -NFS4ERR_WRONGSEC:
6431                 case -NFS4ERR_NOTSUPP:
6432                         goto out;
6433                 default:
6434                         err = nfs4_handle_exception(server, err, &exception);
6435                 }
6436         } while (exception.retry);
6437 out:
6438         return err;
6439 }
6440
6441 static int
6442 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6443                     struct nfs_fsinfo *info)
6444 {
6445         int err;
6446         struct page *page;
6447         rpc_authflavor_t flavor;
6448         struct nfs4_secinfo_flavors *flavors;
6449
6450         page = alloc_page(GFP_KERNEL);
6451         if (!page) {
6452                 err = -ENOMEM;
6453                 goto out;
6454         }
6455
6456         flavors = page_address(page);
6457         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6458
6459         /*
6460          * Fall back on "guess and check" method if
6461          * the server doesn't support SECINFO_NO_NAME
6462          */
6463         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6464                 err = nfs4_find_root_sec(server, fhandle, info);
6465                 goto out_freepage;
6466         }
6467         if (err)
6468                 goto out_freepage;
6469
6470         flavor = nfs_find_best_sec(flavors);
6471         if (err == 0)
6472                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6473
6474 out_freepage:
6475         put_page(page);
6476         if (err == -EACCES)
6477                 return -EPERM;
6478 out:
6479         return err;
6480 }
6481
6482 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6483 {
6484         int status;
6485         struct nfs41_test_stateid_args args = {
6486                 .stateid = stateid,
6487         };
6488         struct nfs41_test_stateid_res res;
6489         struct rpc_message msg = {
6490                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6491                 .rpc_argp = &args,
6492                 .rpc_resp = &res,
6493         };
6494
6495         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6496         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6497
6498         if (status == NFS_OK)
6499                 return res.status;
6500         return status;
6501 }
6502
6503 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6504 {
6505         struct nfs4_exception exception = { };
6506         int err;
6507         do {
6508                 err = nfs4_handle_exception(server,
6509                                 _nfs41_test_stateid(server, stateid),
6510                                 &exception);
6511         } while (exception.retry);
6512         return err;
6513 }
6514
6515 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6516 {
6517         struct nfs41_free_stateid_args args = {
6518                 .stateid = stateid,
6519         };
6520         struct nfs41_free_stateid_res res;
6521         struct rpc_message msg = {
6522                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6523                 .rpc_argp = &args,
6524                 .rpc_resp = &res,
6525         };
6526
6527         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6528         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6529 }
6530
6531 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6532 {
6533         struct nfs4_exception exception = { };
6534         int err;
6535         do {
6536                 err = nfs4_handle_exception(server,
6537                                 _nfs4_free_stateid(server, stateid),
6538                                 &exception);
6539         } while (exception.retry);
6540         return err;
6541 }
6542
6543 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6544                 const nfs4_stateid *s2)
6545 {
6546         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6547                 return false;
6548
6549         if (s1->seqid == s2->seqid)
6550                 return true;
6551         if (s1->seqid == 0 || s2->seqid == 0)
6552                 return true;
6553
6554         return false;
6555 }
6556
6557 #endif /* CONFIG_NFS_V4_1 */
6558
6559 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6560                 const nfs4_stateid *s2)
6561 {
6562         return nfs4_stateid_match(s1, s2);
6563 }
6564
6565
6566 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6567         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6568         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6569         .recover_open   = nfs4_open_reclaim,
6570         .recover_lock   = nfs4_lock_reclaim,
6571         .establish_clid = nfs4_init_clientid,
6572         .get_clid_cred  = nfs4_get_setclientid_cred,
6573 };
6574
6575 #if defined(CONFIG_NFS_V4_1)
6576 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6577         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6578         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6579         .recover_open   = nfs4_open_reclaim,
6580         .recover_lock   = nfs4_lock_reclaim,
6581         .establish_clid = nfs41_init_clientid,
6582         .get_clid_cred  = nfs4_get_exchange_id_cred,
6583         .reclaim_complete = nfs41_proc_reclaim_complete,
6584 };
6585 #endif /* CONFIG_NFS_V4_1 */
6586
6587 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6588         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6589         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6590         .recover_open   = nfs4_open_expired,
6591         .recover_lock   = nfs4_lock_expired,
6592         .establish_clid = nfs4_init_clientid,
6593         .get_clid_cred  = nfs4_get_setclientid_cred,
6594 };
6595
6596 #if defined(CONFIG_NFS_V4_1)
6597 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6598         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6599         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6600         .recover_open   = nfs41_open_expired,
6601         .recover_lock   = nfs41_lock_expired,
6602         .establish_clid = nfs41_init_clientid,
6603         .get_clid_cred  = nfs4_get_exchange_id_cred,
6604 };
6605 #endif /* CONFIG_NFS_V4_1 */
6606
6607 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6608         .sched_state_renewal = nfs4_proc_async_renew,
6609         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6610         .renew_lease = nfs4_proc_renew,
6611 };
6612
6613 #if defined(CONFIG_NFS_V4_1)
6614 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6615         .sched_state_renewal = nfs41_proc_async_sequence,
6616         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6617         .renew_lease = nfs4_proc_sequence,
6618 };
6619 #endif
6620
6621 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6622         .minor_version = 0,
6623         .call_sync = _nfs4_call_sync,
6624         .match_stateid = nfs4_match_stateid,
6625         .find_root_sec = nfs4_find_root_sec,
6626         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6627         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6628         .state_renewal_ops = &nfs40_state_renewal_ops,
6629 };
6630
6631 #if defined(CONFIG_NFS_V4_1)
6632 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6633         .minor_version = 1,
6634         .call_sync = _nfs4_call_sync_session,
6635         .match_stateid = nfs41_match_stateid,
6636         .find_root_sec = nfs41_find_root_sec,
6637         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6638         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6639         .state_renewal_ops = &nfs41_state_renewal_ops,
6640 };
6641 #endif
6642
6643 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6644         [0] = &nfs_v4_0_minor_ops,
6645 #if defined(CONFIG_NFS_V4_1)
6646         [1] = &nfs_v4_1_minor_ops,
6647 #endif
6648 };
6649
6650 static const struct inode_operations nfs4_file_inode_operations = {
6651         .permission     = nfs_permission,
6652         .getattr        = nfs_getattr,
6653         .setattr        = nfs_setattr,
6654         .getxattr       = generic_getxattr,
6655         .setxattr       = generic_setxattr,
6656         .listxattr      = generic_listxattr,
6657         .removexattr    = generic_removexattr,
6658 };
6659
6660 const struct nfs_rpc_ops nfs_v4_clientops = {
6661         .version        = 4,                    /* protocol version */
6662         .dentry_ops     = &nfs4_dentry_operations,
6663         .dir_inode_ops  = &nfs4_dir_inode_operations,
6664         .file_inode_ops = &nfs4_file_inode_operations,
6665         .file_ops       = &nfs4_file_operations,
6666         .getroot        = nfs4_proc_get_root,
6667         .submount       = nfs4_submount,
6668         .getattr        = nfs4_proc_getattr,
6669         .setattr        = nfs4_proc_setattr,
6670         .lookup         = nfs4_proc_lookup,
6671         .access         = nfs4_proc_access,
6672         .readlink       = nfs4_proc_readlink,
6673         .create         = nfs4_proc_create,
6674         .remove         = nfs4_proc_remove,
6675         .unlink_setup   = nfs4_proc_unlink_setup,
6676         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6677         .unlink_done    = nfs4_proc_unlink_done,
6678         .rename         = nfs4_proc_rename,
6679         .rename_setup   = nfs4_proc_rename_setup,
6680         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6681         .rename_done    = nfs4_proc_rename_done,
6682         .link           = nfs4_proc_link,
6683         .symlink        = nfs4_proc_symlink,
6684         .mkdir          = nfs4_proc_mkdir,
6685         .rmdir          = nfs4_proc_remove,
6686         .readdir        = nfs4_proc_readdir,
6687         .mknod          = nfs4_proc_mknod,
6688         .statfs         = nfs4_proc_statfs,
6689         .fsinfo         = nfs4_proc_fsinfo,
6690         .pathconf       = nfs4_proc_pathconf,
6691         .set_capabilities = nfs4_server_capabilities,
6692         .decode_dirent  = nfs4_decode_dirent,
6693         .read_setup     = nfs4_proc_read_setup,
6694         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6695         .read_done      = nfs4_read_done,
6696         .write_setup    = nfs4_proc_write_setup,
6697         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6698         .write_done     = nfs4_write_done,
6699         .commit_setup   = nfs4_proc_commit_setup,
6700         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6701         .commit_done    = nfs4_commit_done,
6702         .lock           = nfs4_proc_lock,
6703         .clear_acl_cache = nfs4_zap_acl_attr,
6704         .close_context  = nfs4_close_context,
6705         .open_context   = nfs4_atomic_open,
6706         .init_client    = nfs4_init_client,
6707 };
6708
6709 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6710         .prefix = XATTR_NAME_NFSV4_ACL,
6711         .list   = nfs4_xattr_list_nfs4_acl,
6712         .get    = nfs4_xattr_get_nfs4_acl,
6713         .set    = nfs4_xattr_set_nfs4_acl,
6714 };
6715
6716 const struct xattr_handler *nfs4_xattr_handlers[] = {
6717         &nfs4_xattr_nfs4_acl_handler,
6718         NULL
6719 };
6720
6721 module_param(max_session_slots, ushort, 0644);
6722 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6723                 "requests the client will negotiate");
6724
6725 /*
6726  * Local variables:
6727  *  c-basic-offset: 8
6728  * End:
6729  */