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/sunrpc/bc_xprt.h>
  56 #include <linux/xattr.h>
  57 #include <linux/utsname.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65
  66 #define NFSDBG_FACILITY         NFSDBG_PROC
  67
  68 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  69 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  70
  71 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  72
  73 struct nfs4_opendata;
  74 static int _nfs4_proc_open(struct nfs4_opendata *data);
  75 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  76 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  77 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  78 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  79 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  80                             struct nfs_fattr *fattr, struct iattr *sattr,
  81                             struct nfs4_state *state);
  82 #ifdef CONFIG_NFS_V4_1
  83 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  84 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  85 #endif
  86 /* Prevent leaks of NFSv4 errors into userland */
  87 static int nfs4_map_errors(int err)
  88 {
  89         if (err >= -1000)
  90                 return err;
  91         switch (err) {
  92         case -NFS4ERR_RESOURCE:
  93                 return -EREMOTEIO;
  94         case -NFS4ERR_WRONGSEC:
  95                 return -EPERM;
  96         case -NFS4ERR_BADOWNER:
  97         case -NFS4ERR_BADNAME:
  98                 return -EINVAL;
  99         case -NFS4ERR_SHARE_DENIED:
 100                 return -EACCES;
 101         default:
 102                 dprintk("%s could not handle NFSv4 error %d\n",
 103                                 __func__, -err);
 104                 break;
 105         }
 106         return -EIO;
 107 }
 108
 109 /*
 110  * This is our standard bitmap for GETATTR requests.
 111  */
 112 const u32 nfs4_fattr_bitmap[2] = {
 113         FATTR4_WORD0_TYPE
 114         | FATTR4_WORD0_CHANGE
 115         | FATTR4_WORD0_SIZE
 116         | FATTR4_WORD0_FSID
 117         | FATTR4_WORD0_FILEID,
 118         FATTR4_WORD1_MODE
 119         | FATTR4_WORD1_NUMLINKS
 120         | FATTR4_WORD1_OWNER
 121         | FATTR4_WORD1_OWNER_GROUP
 122         | FATTR4_WORD1_RAWDEV
 123         | FATTR4_WORD1_SPACE_USED
 124         | FATTR4_WORD1_TIME_ACCESS
 125         | FATTR4_WORD1_TIME_METADATA
 126         | FATTR4_WORD1_TIME_MODIFY
 127 };
 128
 129 const u32 nfs4_statfs_bitmap[2] = {
 130         FATTR4_WORD0_FILES_AVAIL
 131         | FATTR4_WORD0_FILES_FREE
 132         | FATTR4_WORD0_FILES_TOTAL,
 133         FATTR4_WORD1_SPACE_AVAIL
 134         | FATTR4_WORD1_SPACE_FREE
 135         | FATTR4_WORD1_SPACE_TOTAL
 136 };
 137
 138 const u32 nfs4_pathconf_bitmap[2] = {
 139         FATTR4_WORD0_MAXLINK
 140         | FATTR4_WORD0_MAXNAME,
 141         0
 142 };
 143
 144 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 145                         | FATTR4_WORD0_MAXREAD
 146                         | FATTR4_WORD0_MAXWRITE
 147                         | FATTR4_WORD0_LEASE_TIME,
 148                         FATTR4_WORD1_TIME_DELTA
 149                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 150                         FATTR4_WORD2_LAYOUT_BLKSIZE
 151 };
 152
 153 const u32 nfs4_fs_locations_bitmap[2] = {
 154         FATTR4_WORD0_TYPE
 155         | FATTR4_WORD0_CHANGE
 156         | FATTR4_WORD0_SIZE
 157         | FATTR4_WORD0_FSID
 158         | FATTR4_WORD0_FILEID
 159         | FATTR4_WORD0_FS_LOCATIONS,
 160         FATTR4_WORD1_MODE
 161         | FATTR4_WORD1_NUMLINKS
 162         | FATTR4_WORD1_OWNER
 163         | FATTR4_WORD1_OWNER_GROUP
 164         | FATTR4_WORD1_RAWDEV
 165         | FATTR4_WORD1_SPACE_USED
 166         | FATTR4_WORD1_TIME_ACCESS
 167         | FATTR4_WORD1_TIME_METADATA
 168         | FATTR4_WORD1_TIME_MODIFY
 169         | FATTR4_WORD1_MOUNTED_ON_FILEID
 170 };
 171
 172 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 173                 struct nfs4_readdir_arg *readdir)
 174 {
 175         __be32 *start, *p;
 176
 177         BUG_ON(readdir->count < 80);
 178         if (cookie > 2) {
 179                 readdir->cookie = cookie;
 180                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 181                 return;
 182         }
 183
 184         readdir->cookie = 0;
 185         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 186         if (cookie == 2)
 187                 return;
 188
 189         /*
 190          * NFSv4 servers do not return entries for '.' and '..'
 191          * Therefore, we fake these entries here.  We let '.'
 192          * have cookie 0 and '..' have cookie 1.  Note that
 193          * when talking to the server, we always send cookie 0
 194          * instead of 1 or 2.
 195          */
 196         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 197
 198         if (cookie == 0) {
 199                 *p++ = xdr_one;                                  /* next */
 200                 *p++ = xdr_zero;                   /* cookie, first word */
 201                 *p++ = xdr_one;                   /* cookie, second word */
 202                 *p++ = xdr_one;                             /* entry len */
 203                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 204                 p++;
 205                 *p++ = xdr_one;                         /* bitmap length */
 206                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 207                 *p++ = htonl(8);              /* attribute buffer length */
 208                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 209         }
 210
 211         *p++ = xdr_one;                                  /* next */
 212         *p++ = xdr_zero;                   /* cookie, first word */
 213         *p++ = xdr_two;                   /* cookie, second word */
 214         *p++ = xdr_two;                             /* entry len */
 215         memcpy(p, "..\0\0", 4);                         /* entry */
 216         p++;
 217         *p++ = xdr_one;                         /* bitmap length */
 218         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 219         *p++ = htonl(8);              /* attribute buffer length */
 220         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 221
 222         readdir->pgbase = (char *)p - (char *)start;
 223         readdir->count -= readdir->pgbase;
 224         kunmap_atomic(start, KM_USER0);
 225 }
 226
 227 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 228 {
 229         int res;
 230
 231         might_sleep();
 232
 233         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 234                         nfs_wait_bit_killable, TASK_KILLABLE);
 235         return res;
 236 }
 237
 238 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 239 {
 240         int res = 0;
 241
 242         might_sleep();
 243
 244         if (*timeout <= 0)
 245                 *timeout = NFS4_POLL_RETRY_MIN;
 246         if (*timeout > NFS4_POLL_RETRY_MAX)
 247                 *timeout = NFS4_POLL_RETRY_MAX;
 248         schedule_timeout_killable(*timeout);
 249         if (fatal_signal_pending(current))
 250                 res = -ERESTARTSYS;
 251         *timeout <<= 1;
 252         return res;
 253 }
 254
 255 /* This is the error handling routine for processes that are allowed
 256  * to sleep.
 257  */
 258 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 259 {
 260         struct nfs_client *clp = server->nfs_client;
 261         struct nfs4_state *state = exception->state;
 262         struct inode *inode = exception->inode;
 263         int ret = errorcode;
 264
 265         exception->retry = 0;
 266         switch(errorcode) {
 267                 case 0:
 268                         return 0;
 269                 case -NFS4ERR_OPENMODE:
 270                         if (nfs_have_delegation(inode, FMODE_READ)) {
 271                                 nfs_inode_return_delegation(inode);
 272                                 exception->retry = 1;
 273                                 return 0;
 274                         }
 275                         if (state == NULL)
 276                                 break;
 277                         nfs4_schedule_stateid_recovery(server, state);
 278                         goto wait_on_recovery;
 279                 case -NFS4ERR_DELEG_REVOKED:
 280                 case -NFS4ERR_ADMIN_REVOKED:
 281                 case -NFS4ERR_BAD_STATEID:
 282                         if (state != NULL)
 283                                 nfs_remove_bad_delegation(state->inode);
 284                         if (state == NULL)
 285                                 break;
 286                         nfs4_schedule_stateid_recovery(server, state);
 287                         goto wait_on_recovery;
 288                 case -NFS4ERR_EXPIRED:
 289                         if (state != NULL)
 290                                 nfs4_schedule_stateid_recovery(server, state);
 291                 case -NFS4ERR_STALE_STATEID:
 292                 case -NFS4ERR_STALE_CLIENTID:
 293                         nfs4_schedule_lease_recovery(clp);
 294                         goto wait_on_recovery;
 295 #if defined(CONFIG_NFS_V4_1)
 296                 case -NFS4ERR_BADSESSION:
 297                 case -NFS4ERR_BADSLOT:
 298                 case -NFS4ERR_BAD_HIGH_SLOT:
 299                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 300                 case -NFS4ERR_DEADSESSION:
 301                 case -NFS4ERR_SEQ_FALSE_RETRY:
 302                 case -NFS4ERR_SEQ_MISORDERED:
 303                         dprintk("%s ERROR: %d Reset session\n", __func__,
 304                                 errorcode);
 305                         nfs4_schedule_session_recovery(clp->cl_session);
 306                         exception->retry = 1;
 307                         break;
 308 #endif /* defined(CONFIG_NFS_V4_1) */
 309                 case -NFS4ERR_FILE_OPEN:
 310                         if (exception->timeout > HZ) {
 311                                 /* We have retried a decent amount, time to
 312                                  * fail
 313                                  */
 314                                 ret = -EBUSY;
 315                                 break;
 316                         }
 317                 case -NFS4ERR_GRACE:
 318                 case -NFS4ERR_DELAY:
 319                 case -EKEYEXPIRED:
 320                         ret = nfs4_delay(server->client, &exception->timeout);
 321                         if (ret != 0)
 322                                 break;
 323                 case -NFS4ERR_RETRY_UNCACHED_REP:
 324                 case -NFS4ERR_OLD_STATEID:
 325                         exception->retry = 1;
 326                         break;
 327                 case -NFS4ERR_BADOWNER:
 328                         /* The following works around a Linux server bug! */
 329                 case -NFS4ERR_BADNAME:
 330                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 331                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 332                                 exception->retry = 1;
 333                                 printk(KERN_WARNING "NFS: v4 server %s "
 334                                                 "does not accept raw "
 335                                                 "uid/gids. "
 336                                                 "Reenabling the idmapper.\n",
 337                                                 server->nfs_client->cl_hostname);
 338                         }
 339         }
 340         /* We failed to handle the error */
 341         return nfs4_map_errors(ret);
 342 wait_on_recovery:
 343         ret = nfs4_wait_clnt_recover(clp);
 344         if (ret == 0)
 345                 exception->retry = 1;
 346         return ret;
 347 }
 348
 349
 350 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 351 {
 352         spin_lock(&clp->cl_lock);
 353         if (time_before(clp->cl_last_renewal,timestamp))
 354                 clp->cl_last_renewal = timestamp;
 355         spin_unlock(&clp->cl_lock);
 356 }
 357
 358 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 359 {
 360         do_renew_lease(server->nfs_client, timestamp);
 361 }
 362
 363 #if defined(CONFIG_NFS_V4_1)
 364
 365 /*
 366  * nfs4_free_slot - free a slot and efficiently update slot table.
 367  *
 368  * freeing a slot is trivially done by clearing its respective bit
 369  * in the bitmap.
 370  * If the freed slotid equals highest_used_slotid we want to update it
 371  * so that the server would be able to size down the slot table if needed,
 372  * otherwise we know that the highest_used_slotid is still in use.
 373  * When updating highest_used_slotid there may be "holes" in the bitmap
 374  * so we need to scan down from highest_used_slotid to 0 looking for the now
 375  * highest slotid in use.
 376  * If none found, highest_used_slotid is set to -1.
 377  *
 378  * Must be called while holding tbl->slot_tbl_lock
 379  */
 380 static void
 381 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 382 {
 383         int free_slotid = free_slot - tbl->slots;
 384         int slotid = free_slotid;
 385
 386         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 387         /* clear used bit in bitmap */
 388         __clear_bit(slotid, tbl->used_slots);
 389
 390         /* update highest_used_slotid when it is freed */
 391         if (slotid == tbl->highest_used_slotid) {
 392                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 393                 if (slotid < tbl->max_slots)
 394                         tbl->highest_used_slotid = slotid;
 395                 else
 396                         tbl->highest_used_slotid = -1;
 397         }
 398         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 399                 free_slotid, tbl->highest_used_slotid);
 400 }
 401
 402 /*
 403  * Signal state manager thread if session fore channel is drained
 404  */
 405 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 406 {
 407         struct rpc_task *task;
 408
 409         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 410                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 411                 if (task)
 412                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 413                 return;
 414         }
 415
 416         if (ses->fc_slot_table.highest_used_slotid != -1)
 417                 return;
 418
 419         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 420         complete(&ses->fc_slot_table.complete);
 421 }
 422
 423 /*
 424  * Signal state manager thread if session back channel is drained
 425  */
 426 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 427 {
 428         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 429             ses->bc_slot_table.highest_used_slotid != -1)
 430                 return;
 431         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 432         complete(&ses->bc_slot_table.complete);
 433 }
 434
 435 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 436 {
 437         struct nfs4_slot_table *tbl;
 438
 439         tbl = &res->sr_session->fc_slot_table;
 440         if (!res->sr_slot) {
 441                 /* just wake up the next guy waiting since
 442                  * we may have not consumed a slot after all */
 443                 dprintk("%s: No slot\n", __func__);
 444                 return;
 445         }
 446
 447         spin_lock(&tbl->slot_tbl_lock);
 448         nfs4_free_slot(tbl, res->sr_slot);
 449         nfs4_check_drain_fc_complete(res->sr_session);
 450         spin_unlock(&tbl->slot_tbl_lock);
 451         res->sr_slot = NULL;
 452 }
 453
 454 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 455 {
 456         unsigned long timestamp;
 457         struct nfs_client *clp;
 458
 459         /*
 460          * sr_status remains 1 if an RPC level error occurred. The server
 461          * may or may not have processed the sequence operation..
 462          * Proceed as if the server received and processed the sequence
 463          * operation.
 464          */
 465         if (res->sr_status == 1)
 466                 res->sr_status = NFS_OK;
 467
 468         /* don't increment the sequence number if the task wasn't sent */
 469         if (!RPC_WAS_SENT(task))
 470                 goto out;
 471
 472         /* Check the SEQUENCE operation status */
 473         switch (res->sr_status) {
 474         case 0:
 475                 /* Update the slot's sequence and clientid lease timer */
 476                 ++res->sr_slot->seq_nr;
 477                 timestamp = res->sr_renewal_time;
 478                 clp = res->sr_session->clp;
 479                 do_renew_lease(clp, timestamp);
 480                 /* Check sequence flags */
 481                 if (res->sr_status_flags != 0)
 482                         nfs4_schedule_lease_recovery(clp);
 483                 break;
 484         case -NFS4ERR_DELAY:
 485                 /* The server detected a resend of the RPC call and
 486                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 487                  * of RFC5661.
 488                  */
 489                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 490                         __func__,
 491                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 492                         res->sr_slot->seq_nr);
 493                 goto out_retry;
 494         default:
 495                 /* Just update the slot sequence no. */
 496                 ++res->sr_slot->seq_nr;
 497         }
 498 out:
 499         /* The session may be reset by one of the error handlers. */
 500         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 501         nfs41_sequence_free_slot(res);
 502         return 1;
 503 out_retry:
 504         if (!rpc_restart_call(task))
 505                 goto out;
 506         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 507         return 0;
 508 }
 509
 510 static int nfs4_sequence_done(struct rpc_task *task,
 511                                struct nfs4_sequence_res *res)
 512 {
 513         if (res->sr_session == NULL)
 514                 return 1;
 515         return nfs41_sequence_done(task, res);
 516 }
 517
 518 /*
 519  * nfs4_find_slot - efficiently look for a free slot
 520  *
 521  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 522  * If found, we mark the slot as used, update the highest_used_slotid,
 523  * and respectively set up the sequence operation args.
 524  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 525  *
 526  * Note: must be called with under the slot_tbl_lock.
 527  */
 528 static u8
 529 nfs4_find_slot(struct nfs4_slot_table *tbl)
 530 {
 531         int slotid;
 532         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 533         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 534
 535         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 536                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 537                 tbl->max_slots);
 538         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 539         if (slotid >= tbl->max_slots)
 540                 goto out;
 541         __set_bit(slotid, tbl->used_slots);
 542         if (slotid > tbl->highest_used_slotid)
 543                 tbl->highest_used_slotid = slotid;
 544         ret_id = slotid;
 545 out:
 546         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 547                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 548         return ret_id;
 549 }
 550
 551 int nfs41_setup_sequence(struct nfs4_session *session,
 552                                 struct nfs4_sequence_args *args,
 553                                 struct nfs4_sequence_res *res,
 554                                 int cache_reply,
 555                                 struct rpc_task *task)
 556 {
 557         struct nfs4_slot *slot;
 558         struct nfs4_slot_table *tbl;
 559         u8 slotid;
 560
 561         dprintk("--> %s\n", __func__);
 562         /* slot already allocated? */
 563         if (res->sr_slot != NULL)
 564                 return 0;
 565
 566         tbl = &session->fc_slot_table;
 567
 568         spin_lock(&tbl->slot_tbl_lock);
 569         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 570             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 571                 /*
 572                  * The state manager will wait until the slot table is empty.
 573                  * Schedule the reset thread
 574                  */
 575                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 576                 spin_unlock(&tbl->slot_tbl_lock);
 577                 dprintk("%s Schedule Session Reset\n", __func__);
 578                 return -EAGAIN;
 579         }
 580
 581         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 582             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 583                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 584                 spin_unlock(&tbl->slot_tbl_lock);
 585                 dprintk("%s enforce FIFO order\n", __func__);
 586                 return -EAGAIN;
 587         }
 588
 589         slotid = nfs4_find_slot(tbl);
 590         if (slotid == NFS4_MAX_SLOT_TABLE) {
 591                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 592                 spin_unlock(&tbl->slot_tbl_lock);
 593                 dprintk("<-- %s: no free slots\n", __func__);
 594                 return -EAGAIN;
 595         }
 596         spin_unlock(&tbl->slot_tbl_lock);
 597
 598         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 599         slot = tbl->slots + slotid;
 600         args->sa_session = session;
 601         args->sa_slotid = slotid;
 602         args->sa_cache_this = cache_reply;
 603
 604         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 605
 606         res->sr_session = session;
 607         res->sr_slot = slot;
 608         res->sr_renewal_time = jiffies;
 609         res->sr_status_flags = 0;
 610         /*
 611          * sr_status is only set in decode_sequence, and so will remain
 612          * set to 1 if an rpc level failure occurs.
 613          */
 614         res->sr_status = 1;
 615         return 0;
 616 }
 617 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 618
 619 int nfs4_setup_sequence(const struct nfs_server *server,
 620                         struct nfs4_sequence_args *args,
 621                         struct nfs4_sequence_res *res,
 622                         int cache_reply,
 623                         struct rpc_task *task)
 624 {
 625         struct nfs4_session *session = nfs4_get_session(server);
 626         int ret = 0;
 627
 628         if (session == NULL) {
 629                 args->sa_session = NULL;
 630                 res->sr_session = NULL;
 631                 goto out;
 632         }
 633
 634         dprintk("--> %s clp %p session %p sr_slot %td\n",
 635                 __func__, session->clp, session, res->sr_slot ?
 636                         res->sr_slot - session->fc_slot_table.slots : -1);
 637
 638         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 639                                    task);
 640 out:
 641         dprintk("<-- %s status=%d\n", __func__, ret);
 642         return ret;
 643 }
 644
 645 struct nfs41_call_sync_data {
 646         const struct nfs_server *seq_server;
 647         struct nfs4_sequence_args *seq_args;
 648         struct nfs4_sequence_res *seq_res;
 649         int cache_reply;
 650 };
 651
 652 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 653 {
 654         struct nfs41_call_sync_data *data = calldata;
 655
 656         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 657
 658         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 659                                 data->seq_res, data->cache_reply, task))
 660                 return;
 661         rpc_call_start(task);
 662 }
 663
 664 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 665 {
 666         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 667         nfs41_call_sync_prepare(task, calldata);
 668 }
 669
 670 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 671 {
 672         struct nfs41_call_sync_data *data = calldata;
 673
 674         nfs41_sequence_done(task, data->seq_res);
 675 }
 676
 677 struct rpc_call_ops nfs41_call_sync_ops = {
 678         .rpc_call_prepare = nfs41_call_sync_prepare,
 679         .rpc_call_done = nfs41_call_sync_done,
 680 };
 681
 682 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 683         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 684         .rpc_call_done = nfs41_call_sync_done,
 685 };
 686
 687 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 688                                    struct nfs_server *server,
 689                                    struct rpc_message *msg,
 690                                    struct nfs4_sequence_args *args,
 691                                    struct nfs4_sequence_res *res,
 692                                    int cache_reply,
 693                                    int privileged)
 694 {
 695         int ret;
 696         struct rpc_task *task;
 697         struct nfs41_call_sync_data data = {
 698                 .seq_server = server,
 699                 .seq_args = args,
 700                 .seq_res = res,
 701                 .cache_reply = cache_reply,
 702         };
 703         struct rpc_task_setup task_setup = {
 704                 .rpc_client = clnt,
 705                 .rpc_message = msg,
 706                 .callback_ops = &nfs41_call_sync_ops,
 707                 .callback_data = &data
 708         };
 709
 710         res->sr_slot = NULL;
 711         if (privileged)
 712                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 713         task = rpc_run_task(&task_setup);
 714         if (IS_ERR(task))
 715                 ret = PTR_ERR(task);
 716         else {
 717                 ret = task->tk_status;
 718                 rpc_put_task(task);
 719         }
 720         return ret;
 721 }
 722
 723 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 724                             struct nfs_server *server,
 725                             struct rpc_message *msg,
 726                             struct nfs4_sequence_args *args,
 727                             struct nfs4_sequence_res *res,
 728                             int cache_reply)
 729 {
 730         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 731 }
 732
 733 #else
 734 static int nfs4_sequence_done(struct rpc_task *task,
 735                                struct nfs4_sequence_res *res)
 736 {
 737         return 1;
 738 }
 739 #endif /* CONFIG_NFS_V4_1 */
 740
 741 int _nfs4_call_sync(struct rpc_clnt *clnt,
 742                     struct nfs_server *server,
 743                     struct rpc_message *msg,
 744                     struct nfs4_sequence_args *args,
 745                     struct nfs4_sequence_res *res,
 746                     int cache_reply)
 747 {
 748         args->sa_session = res->sr_session = NULL;
 749         return rpc_call_sync(clnt, msg, 0);
 750 }
 751
 752 static inline
 753 int nfs4_call_sync(struct rpc_clnt *clnt,
 754                    struct nfs_server *server,
 755                    struct rpc_message *msg,
 756                    struct nfs4_sequence_args *args,
 757                    struct nfs4_sequence_res *res,
 758                    int cache_reply)
 759 {
 760         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 761                                                 args, res, cache_reply);
 762 }
 763
 764 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 765 {
 766         struct nfs_inode *nfsi = NFS_I(dir);
 767
 768         spin_lock(&dir->i_lock);
 769         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 770         if (!cinfo->atomic || cinfo->before != dir->i_version)
 771                 nfs_force_lookup_revalidate(dir);
 772         dir->i_version = cinfo->after;
 773         spin_unlock(&dir->i_lock);
 774 }
 775
 776 struct nfs4_opendata {
 777         struct kref kref;
 778         struct nfs_openargs o_arg;
 779         struct nfs_openres o_res;
 780         struct nfs_open_confirmargs c_arg;
 781         struct nfs_open_confirmres c_res;
 782         struct nfs_fattr f_attr;
 783         struct nfs_fattr dir_attr;
 784         struct dentry *dir;
 785         struct dentry *dentry;
 786         struct nfs4_state_owner *owner;
 787         struct nfs4_state *state;
 788         struct iattr attrs;
 789         unsigned long timestamp;
 790         unsigned int rpc_done : 1;
 791         int rpc_status;
 792         int cancelled;
 793 };
 794
 795
 796 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 797 {
 798         p->o_res.f_attr = &p->f_attr;
 799         p->o_res.dir_attr = &p->dir_attr;
 800         p->o_res.seqid = p->o_arg.seqid;
 801         p->c_res.seqid = p->c_arg.seqid;
 802         p->o_res.server = p->o_arg.server;
 803         nfs_fattr_init(&p->f_attr);
 804         nfs_fattr_init(&p->dir_attr);
 805 }
 806
 807 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 808                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 809                 const struct iattr *attrs,
 810                 gfp_t gfp_mask)
 811 {
 812         struct dentry *parent = dget_parent(dentry);
 813         struct inode *dir = parent->d_inode;
 814         struct nfs_server *server = NFS_SERVER(dir);
 815         struct nfs4_opendata *p;
 816
 817         p = kzalloc(sizeof(*p), gfp_mask);
 818         if (p == NULL)
 819                 goto err;
 820         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 821         if (p->o_arg.seqid == NULL)
 822                 goto err_free;
 823         nfs_sb_active(dentry->d_sb);
 824         p->dentry = dget(dentry);
 825         p->dir = parent;
 826         p->owner = sp;
 827         atomic_inc(&sp->so_count);
 828         p->o_arg.fh = NFS_FH(dir);
 829         p->o_arg.open_flags = flags;
 830         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 831         p->o_arg.clientid = server->nfs_client->cl_clientid;
 832         p->o_arg.id = sp->so_owner_id.id;
 833         p->o_arg.name = &dentry->d_name;
 834         p->o_arg.server = server;
 835         p->o_arg.bitmask = server->attr_bitmask;
 836         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 837         if (flags & O_CREAT) {
 838                 u32 *s;
 839
 840                 p->o_arg.u.attrs = &p->attrs;
 841                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 842                 s = (u32 *) p->o_arg.u.verifier.data;
 843                 s[0] = jiffies;
 844                 s[1] = current->pid;
 845         }
 846         p->c_arg.fh = &p->o_res.fh;
 847         p->c_arg.stateid = &p->o_res.stateid;
 848         p->c_arg.seqid = p->o_arg.seqid;
 849         nfs4_init_opendata_res(p);
 850         kref_init(&p->kref);
 851         return p;
 852 err_free:
 853         kfree(p);
 854 err:
 855         dput(parent);
 856         return NULL;
 857 }
 858
 859 static void nfs4_opendata_free(struct kref *kref)
 860 {
 861         struct nfs4_opendata *p = container_of(kref,
 862                         struct nfs4_opendata, kref);
 863         struct super_block *sb = p->dentry->d_sb;
 864
 865         nfs_free_seqid(p->o_arg.seqid);
 866         if (p->state != NULL)
 867                 nfs4_put_open_state(p->state);
 868         nfs4_put_state_owner(p->owner);
 869         dput(p->dir);
 870         dput(p->dentry);
 871         nfs_sb_deactive(sb);
 872         kfree(p);
 873 }
 874
 875 static void nfs4_opendata_put(struct nfs4_opendata *p)
 876 {
 877         if (p != NULL)
 878                 kref_put(&p->kref, nfs4_opendata_free);
 879 }
 880
 881 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 882 {
 883         int ret;
 884
 885         ret = rpc_wait_for_completion_task(task);
 886         return ret;
 887 }
 888
 889 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 890 {
 891         int ret = 0;
 892
 893         if (open_mode & O_EXCL)
 894                 goto out;
 895         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 896                 case FMODE_READ:
 897                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 898                                 && state->n_rdonly != 0;
 899                         break;
 900                 case FMODE_WRITE:
 901                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 902                                 && state->n_wronly != 0;
 903                         break;
 904                 case FMODE_READ|FMODE_WRITE:
 905                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 906                                 && state->n_rdwr != 0;
 907         }
 908 out:
 909         return ret;
 910 }
 911
 912 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 913 {
 914         if (delegation == NULL)
 915                 return 0;
 916         if ((delegation->type & fmode) != fmode)
 917                 return 0;
 918         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 919                 return 0;
 920         nfs_mark_delegation_referenced(delegation);
 921         return 1;
 922 }
 923
 924 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 925 {
 926         switch (fmode) {
 927                 case FMODE_WRITE:
 928                         state->n_wronly++;
 929                         break;
 930                 case FMODE_READ:
 931                         state->n_rdonly++;
 932                         break;
 933                 case FMODE_READ|FMODE_WRITE:
 934                         state->n_rdwr++;
 935         }
 936         nfs4_state_set_mode_locked(state, state->state | fmode);
 937 }
 938
 939 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 940 {
 941         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 942                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 943         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 944         switch (fmode) {
 945                 case FMODE_READ:
 946                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 947                         break;
 948                 case FMODE_WRITE:
 949                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 950                         break;
 951                 case FMODE_READ|FMODE_WRITE:
 952                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 953         }
 954 }
 955
 956 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 957 {
 958         write_seqlock(&state->seqlock);
 959         nfs_set_open_stateid_locked(state, stateid, fmode);
 960         write_sequnlock(&state->seqlock);
 961 }
 962
 963 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 964 {
 965         /*
 966          * Protect the call to nfs4_state_set_mode_locked and
 967          * serialise the stateid update
 968          */
 969         write_seqlock(&state->seqlock);
 970         if (deleg_stateid != NULL) {
 971                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 972                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 973         }
 974         if (open_stateid != NULL)
 975                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 976         write_sequnlock(&state->seqlock);
 977         spin_lock(&state->owner->so_lock);
 978         update_open_stateflags(state, fmode);
 979         spin_unlock(&state->owner->so_lock);
 980 }
 981
 982 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 983 {
 984         struct nfs_inode *nfsi = NFS_I(state->inode);
 985         struct nfs_delegation *deleg_cur;
 986         int ret = 0;
 987
 988         fmode &= (FMODE_READ|FMODE_WRITE);
 989
 990         rcu_read_lock();
 991         deleg_cur = rcu_dereference(nfsi->delegation);
 992         if (deleg_cur == NULL)
 993                 goto no_delegation;
 994
 995         spin_lock(&deleg_cur->lock);
 996         if (nfsi->delegation != deleg_cur ||
 997             (deleg_cur->type & fmode) != fmode)
 998                 goto no_delegation_unlock;
 999
1000         if (delegation == NULL)
1001                 delegation = &deleg_cur->stateid;
1002         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
1003                 goto no_delegation_unlock;
1004
1005         nfs_mark_delegation_referenced(deleg_cur);
1006         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1007         ret = 1;
1008 no_delegation_unlock:
1009         spin_unlock(&deleg_cur->lock);
1010 no_delegation:
1011         rcu_read_unlock();
1012
1013         if (!ret && open_stateid != NULL) {
1014                 __update_open_stateid(state, open_stateid, NULL, fmode);
1015                 ret = 1;
1016         }
1017
1018         return ret;
1019 }
1020
1021
1022 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1023 {
1024         struct nfs_delegation *delegation;
1025
1026         rcu_read_lock();
1027         delegation = rcu_dereference(NFS_I(inode)->delegation);
1028         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1029                 rcu_read_unlock();
1030                 return;
1031         }
1032         rcu_read_unlock();
1033         nfs_inode_return_delegation(inode);
1034 }
1035
1036 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1037 {
1038         struct nfs4_state *state = opendata->state;
1039         struct nfs_inode *nfsi = NFS_I(state->inode);
1040         struct nfs_delegation *delegation;
1041         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1042         fmode_t fmode = opendata->o_arg.fmode;
1043         nfs4_stateid stateid;
1044         int ret = -EAGAIN;
1045
1046         for (;;) {
1047                 if (can_open_cached(state, fmode, open_mode)) {
1048                         spin_lock(&state->owner->so_lock);
1049                         if (can_open_cached(state, fmode, open_mode)) {
1050                                 update_open_stateflags(state, fmode);
1051                                 spin_unlock(&state->owner->so_lock);
1052                                 goto out_return_state;
1053                         }
1054                         spin_unlock(&state->owner->so_lock);
1055                 }
1056                 rcu_read_lock();
1057                 delegation = rcu_dereference(nfsi->delegation);
1058                 if (!can_open_delegated(delegation, fmode)) {
1059                         rcu_read_unlock();
1060                         break;
1061                 }
1062                 /* Save the delegation */
1063                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1064                 rcu_read_unlock();
1065                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1066                 if (ret != 0)
1067                         goto out;
1068                 ret = -EAGAIN;
1069
1070                 /* Try to update the stateid using the delegation */
1071                 if (update_open_stateid(state, NULL, &stateid, fmode))
1072                         goto out_return_state;
1073         }
1074 out:
1075         return ERR_PTR(ret);
1076 out_return_state:
1077         atomic_inc(&state->count);
1078         return state;
1079 }
1080
1081 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1082 {
1083         struct inode *inode;
1084         struct nfs4_state *state = NULL;
1085         struct nfs_delegation *delegation;
1086         int ret;
1087
1088         if (!data->rpc_done) {
1089                 state = nfs4_try_open_cached(data);
1090                 goto out;
1091         }
1092
1093         ret = -EAGAIN;
1094         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1095                 goto err;
1096         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1097         ret = PTR_ERR(inode);
1098         if (IS_ERR(inode))
1099                 goto err;
1100         ret = -ENOMEM;
1101         state = nfs4_get_open_state(inode, data->owner);
1102         if (state == NULL)
1103                 goto err_put_inode;
1104         if (data->o_res.delegation_type != 0) {
1105                 int delegation_flags = 0;
1106
1107                 rcu_read_lock();
1108                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1109                 if (delegation)
1110                         delegation_flags = delegation->flags;
1111                 rcu_read_unlock();
1112                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1113                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1114                                         "returning a delegation for "
1115                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1116                                         NFS_CLIENT(inode)->cl_server);
1117                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1118                         nfs_inode_set_delegation(state->inode,
1119                                         data->owner->so_cred,
1120                                         &data->o_res);
1121                 else
1122                         nfs_inode_reclaim_delegation(state->inode,
1123                                         data->owner->so_cred,
1124                                         &data->o_res);
1125         }
1126
1127         update_open_stateid(state, &data->o_res.stateid, NULL,
1128                         data->o_arg.fmode);
1129         iput(inode);
1130 out:
1131         return state;
1132 err_put_inode:
1133         iput(inode);
1134 err:
1135         return ERR_PTR(ret);
1136 }
1137
1138 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1139 {
1140         struct nfs_inode *nfsi = NFS_I(state->inode);
1141         struct nfs_open_context *ctx;
1142
1143         spin_lock(&state->inode->i_lock);
1144         list_for_each_entry(ctx, &nfsi->open_files, list) {
1145                 if (ctx->state != state)
1146                         continue;
1147                 get_nfs_open_context(ctx);
1148                 spin_unlock(&state->inode->i_lock);
1149                 return ctx;
1150         }
1151         spin_unlock(&state->inode->i_lock);
1152         return ERR_PTR(-ENOENT);
1153 }
1154
1155 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1156 {
1157         struct nfs4_opendata *opendata;
1158
1159         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1160         if (opendata == NULL)
1161                 return ERR_PTR(-ENOMEM);
1162         opendata->state = state;
1163         atomic_inc(&state->count);
1164         return opendata;
1165 }
1166
1167 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1168 {
1169         struct nfs4_state *newstate;
1170         int ret;
1171
1172         opendata->o_arg.open_flags = 0;
1173         opendata->o_arg.fmode = fmode;
1174         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1175         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1176         nfs4_init_opendata_res(opendata);
1177         ret = _nfs4_recover_proc_open(opendata);
1178         if (ret != 0)
1179                 return ret;
1180         newstate = nfs4_opendata_to_nfs4_state(opendata);
1181         if (IS_ERR(newstate))
1182                 return PTR_ERR(newstate);
1183         nfs4_close_state(newstate, fmode);
1184         *res = newstate;
1185         return 0;
1186 }
1187
1188 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1189 {
1190         struct nfs4_state *newstate;
1191         int ret;
1192
1193         /* memory barrier prior to reading state->n_* */
1194         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1195         smp_rmb();
1196         if (state->n_rdwr != 0) {
1197                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1198                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1199                 if (ret != 0)
1200                         return ret;
1201                 if (newstate != state)
1202                         return -ESTALE;
1203         }
1204         if (state->n_wronly != 0) {
1205                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1206                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1207                 if (ret != 0)
1208                         return ret;
1209                 if (newstate != state)
1210                         return -ESTALE;
1211         }
1212         if (state->n_rdonly != 0) {
1213                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1214                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1215                 if (ret != 0)
1216                         return ret;
1217                 if (newstate != state)
1218                         return -ESTALE;
1219         }
1220         /*
1221          * We may have performed cached opens for all three recoveries.
1222          * Check if we need to update the current stateid.
1223          */
1224         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1225             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1226                 write_seqlock(&state->seqlock);
1227                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1228                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1229                 write_sequnlock(&state->seqlock);
1230         }
1231         return 0;
1232 }
1233
1234 /*
1235  * OPEN_RECLAIM:
1236  *      reclaim state on the server after a reboot.
1237  */
1238 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1239 {
1240         struct nfs_delegation *delegation;
1241         struct nfs4_opendata *opendata;
1242         fmode_t delegation_type = 0;
1243         int status;
1244
1245         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1246         if (IS_ERR(opendata))
1247                 return PTR_ERR(opendata);
1248         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1249         opendata->o_arg.fh = NFS_FH(state->inode);
1250         rcu_read_lock();
1251         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1252         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1253                 delegation_type = delegation->type;
1254         rcu_read_unlock();
1255         opendata->o_arg.u.delegation_type = delegation_type;
1256         status = nfs4_open_recover(opendata, state);
1257         nfs4_opendata_put(opendata);
1258         return status;
1259 }
1260
1261 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1262 {
1263         struct nfs_server *server = NFS_SERVER(state->inode);
1264         struct nfs4_exception exception = { };
1265         int err;
1266         do {
1267                 err = _nfs4_do_open_reclaim(ctx, state);
1268                 if (err != -NFS4ERR_DELAY)
1269                         break;
1270                 nfs4_handle_exception(server, err, &exception);
1271         } while (exception.retry);
1272         return err;
1273 }
1274
1275 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1276 {
1277         struct nfs_open_context *ctx;
1278         int ret;
1279
1280         ctx = nfs4_state_find_open_context(state);
1281         if (IS_ERR(ctx))
1282                 return PTR_ERR(ctx);
1283         ret = nfs4_do_open_reclaim(ctx, state);
1284         put_nfs_open_context(ctx);
1285         return ret;
1286 }
1287
1288 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1289 {
1290         struct nfs4_opendata *opendata;
1291         int ret;
1292
1293         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1294         if (IS_ERR(opendata))
1295                 return PTR_ERR(opendata);
1296         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1297         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1298                         sizeof(opendata->o_arg.u.delegation.data));
1299         ret = nfs4_open_recover(opendata, state);
1300         nfs4_opendata_put(opendata);
1301         return ret;
1302 }
1303
1304 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1305 {
1306         struct nfs4_exception exception = { };
1307         struct nfs_server *server = NFS_SERVER(state->inode);
1308         int err;
1309         do {
1310                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1311                 switch (err) {
1312                         case 0:
1313                         case -ENOENT:
1314                         case -ESTALE:
1315                                 goto out;
1316                         case -NFS4ERR_BADSESSION:
1317                         case -NFS4ERR_BADSLOT:
1318                         case -NFS4ERR_BAD_HIGH_SLOT:
1319                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1320                         case -NFS4ERR_DEADSESSION:
1321                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1322                                 goto out;
1323                         case -NFS4ERR_STALE_CLIENTID:
1324                         case -NFS4ERR_STALE_STATEID:
1325                         case -NFS4ERR_EXPIRED:
1326                                 /* Don't recall a delegation if it was lost */
1327                                 nfs4_schedule_lease_recovery(server->nfs_client);
1328                                 goto out;
1329                         case -ERESTARTSYS:
1330                                 /*
1331                                  * The show must go on: exit, but mark the
1332                                  * stateid as needing recovery.
1333                                  */
1334                         case -NFS4ERR_DELEG_REVOKED:
1335                         case -NFS4ERR_ADMIN_REVOKED:
1336                         case -NFS4ERR_BAD_STATEID:
1337                                 nfs_inode_find_state_and_recover(state->inode,
1338                                                 stateid);
1339                                 nfs4_schedule_stateid_recovery(server, state);
1340                         case -EKEYEXPIRED:
1341                                 /*
1342                                  * User RPCSEC_GSS context has expired.
1343                                  * We cannot recover this stateid now, so
1344                                  * skip it and allow recovery thread to
1345                                  * proceed.
1346                                  */
1347                         case -ENOMEM:
1348                                 err = 0;
1349                                 goto out;
1350                 }
1351                 err = nfs4_handle_exception(server, err, &exception);
1352         } while (exception.retry);
1353 out:
1354         return err;
1355 }
1356
1357 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1358 {
1359         struct nfs4_opendata *data = calldata;
1360
1361         data->rpc_status = task->tk_status;
1362         if (data->rpc_status == 0) {
1363                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1364                                 sizeof(data->o_res.stateid.data));
1365                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1366                 renew_lease(data->o_res.server, data->timestamp);
1367                 data->rpc_done = 1;
1368         }
1369 }
1370
1371 static void nfs4_open_confirm_release(void *calldata)
1372 {
1373         struct nfs4_opendata *data = calldata;
1374         struct nfs4_state *state = NULL;
1375
1376         /* If this request hasn't been cancelled, do nothing */
1377         if (data->cancelled == 0)
1378                 goto out_free;
1379         /* In case of error, no cleanup! */
1380         if (!data->rpc_done)
1381                 goto out_free;
1382         state = nfs4_opendata_to_nfs4_state(data);
1383         if (!IS_ERR(state))
1384                 nfs4_close_state(state, data->o_arg.fmode);
1385 out_free:
1386         nfs4_opendata_put(data);
1387 }
1388
1389 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1390         .rpc_call_done = nfs4_open_confirm_done,
1391         .rpc_release = nfs4_open_confirm_release,
1392 };
1393
1394 /*
1395  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1396  */
1397 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1398 {
1399         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1400         struct rpc_task *task;
1401         struct  rpc_message msg = {
1402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1403                 .rpc_argp = &data->c_arg,
1404                 .rpc_resp = &data->c_res,
1405                 .rpc_cred = data->owner->so_cred,
1406         };
1407         struct rpc_task_setup task_setup_data = {
1408                 .rpc_client = server->client,
1409                 .rpc_message = &msg,
1410                 .callback_ops = &nfs4_open_confirm_ops,
1411                 .callback_data = data,
1412                 .workqueue = nfsiod_workqueue,
1413                 .flags = RPC_TASK_ASYNC,
1414         };
1415         int status;
1416
1417         kref_get(&data->kref);
1418         data->rpc_done = 0;
1419         data->rpc_status = 0;
1420         data->timestamp = jiffies;
1421         task = rpc_run_task(&task_setup_data);
1422         if (IS_ERR(task))
1423                 return PTR_ERR(task);
1424         status = nfs4_wait_for_completion_rpc_task(task);
1425         if (status != 0) {
1426                 data->cancelled = 1;
1427                 smp_wmb();
1428         } else
1429                 status = data->rpc_status;
1430         rpc_put_task(task);
1431         return status;
1432 }
1433
1434 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1435 {
1436         struct nfs4_opendata *data = calldata;
1437         struct nfs4_state_owner *sp = data->owner;
1438
1439         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1440                 return;
1441         /*
1442          * Check if we still need to send an OPEN call, or if we can use
1443          * a delegation instead.
1444          */
1445         if (data->state != NULL) {
1446                 struct nfs_delegation *delegation;
1447
1448                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1449                         goto out_no_action;
1450                 rcu_read_lock();
1451                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1452                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1453                     can_open_delegated(delegation, data->o_arg.fmode))
1454                         goto unlock_no_action;
1455                 rcu_read_unlock();
1456         }
1457         /* Update sequence id. */
1458         data->o_arg.id = sp->so_owner_id.id;
1459         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1460         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1461                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1462                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1463         }
1464         data->timestamp = jiffies;
1465         if (nfs4_setup_sequence(data->o_arg.server,
1466                                 &data->o_arg.seq_args,
1467                                 &data->o_res.seq_res, 1, task))
1468                 return;
1469         rpc_call_start(task);
1470         return;
1471 unlock_no_action:
1472         rcu_read_unlock();
1473 out_no_action:
1474         task->tk_action = NULL;
1475
1476 }
1477
1478 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1479 {
1480         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1481         nfs4_open_prepare(task, calldata);
1482 }
1483
1484 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1485 {
1486         struct nfs4_opendata *data = calldata;
1487
1488         data->rpc_status = task->tk_status;
1489
1490         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1491                 return;
1492
1493         if (task->tk_status == 0) {
1494                 switch (data->o_res.f_attr->mode & S_IFMT) {
1495                         case S_IFREG:
1496                                 break;
1497                         case S_IFLNK:
1498                                 data->rpc_status = -ELOOP;
1499                                 break;
1500                         case S_IFDIR:
1501                                 data->rpc_status = -EISDIR;
1502                                 break;
1503                         default:
1504                                 data->rpc_status = -ENOTDIR;
1505                 }
1506                 renew_lease(data->o_res.server, data->timestamp);
1507                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1508                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1509         }
1510         data->rpc_done = 1;
1511 }
1512
1513 static void nfs4_open_release(void *calldata)
1514 {
1515         struct nfs4_opendata *data = calldata;
1516         struct nfs4_state *state = NULL;
1517
1518         /* If this request hasn't been cancelled, do nothing */
1519         if (data->cancelled == 0)
1520                 goto out_free;
1521         /* In case of error, no cleanup! */
1522         if (data->rpc_status != 0 || !data->rpc_done)
1523                 goto out_free;
1524         /* In case we need an open_confirm, no cleanup! */
1525         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1526                 goto out_free;
1527         state = nfs4_opendata_to_nfs4_state(data);
1528         if (!IS_ERR(state))
1529                 nfs4_close_state(state, data->o_arg.fmode);
1530 out_free:
1531         nfs4_opendata_put(data);
1532 }
1533
1534 static const struct rpc_call_ops nfs4_open_ops = {
1535         .rpc_call_prepare = nfs4_open_prepare,
1536         .rpc_call_done = nfs4_open_done,
1537         .rpc_release = nfs4_open_release,
1538 };
1539
1540 static const struct rpc_call_ops nfs4_recover_open_ops = {
1541         .rpc_call_prepare = nfs4_recover_open_prepare,
1542         .rpc_call_done = nfs4_open_done,
1543         .rpc_release = nfs4_open_release,
1544 };
1545
1546 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1547 {
1548         struct inode *dir = data->dir->d_inode;
1549         struct nfs_server *server = NFS_SERVER(dir);
1550         struct nfs_openargs *o_arg = &data->o_arg;
1551         struct nfs_openres *o_res = &data->o_res;
1552         struct rpc_task *task;
1553         struct rpc_message msg = {
1554                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1555                 .rpc_argp = o_arg,
1556                 .rpc_resp = o_res,
1557                 .rpc_cred = data->owner->so_cred,
1558         };
1559         struct rpc_task_setup task_setup_data = {
1560                 .rpc_client = server->client,
1561                 .rpc_message = &msg,
1562                 .callback_ops = &nfs4_open_ops,
1563                 .callback_data = data,
1564                 .workqueue = nfsiod_workqueue,
1565                 .flags = RPC_TASK_ASYNC,
1566         };
1567         int status;
1568
1569         kref_get(&data->kref);
1570         data->rpc_done = 0;
1571         data->rpc_status = 0;
1572         data->cancelled = 0;
1573         if (isrecover)
1574                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1575         task = rpc_run_task(&task_setup_data);
1576         if (IS_ERR(task))
1577                 return PTR_ERR(task);
1578         status = nfs4_wait_for_completion_rpc_task(task);
1579         if (status != 0) {
1580                 data->cancelled = 1;
1581                 smp_wmb();
1582         } else
1583                 status = data->rpc_status;
1584         rpc_put_task(task);
1585
1586         return status;
1587 }
1588
1589 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1590 {
1591         struct inode *dir = data->dir->d_inode;
1592         struct nfs_openres *o_res = &data->o_res;
1593         int status;
1594
1595         status = nfs4_run_open_task(data, 1);
1596         if (status != 0 || !data->rpc_done)
1597                 return status;
1598
1599         nfs_refresh_inode(dir, o_res->dir_attr);
1600
1601         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1602                 status = _nfs4_proc_open_confirm(data);
1603                 if (status != 0)
1604                         return status;
1605         }
1606
1607         return status;
1608 }
1609
1610 /*
1611  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1612  */
1613 static int _nfs4_proc_open(struct nfs4_opendata *data)
1614 {
1615         struct inode *dir = data->dir->d_inode;
1616         struct nfs_server *server = NFS_SERVER(dir);
1617         struct nfs_openargs *o_arg = &data->o_arg;
1618         struct nfs_openres *o_res = &data->o_res;
1619         int status;
1620
1621         status = nfs4_run_open_task(data, 0);
1622         if (!data->rpc_done)
1623                 return status;
1624         if (status != 0) {
1625                 if (status == -NFS4ERR_BADNAME &&
1626                                 !(o_arg->open_flags & O_CREAT))
1627                         return -ENOENT;
1628                 return status;
1629         }
1630
1631         if (o_arg->open_flags & O_CREAT) {
1632                 update_changeattr(dir, &o_res->cinfo);
1633                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1634         } else
1635                 nfs_refresh_inode(dir, o_res->dir_attr);
1636         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1637                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1638         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1639                 status = _nfs4_proc_open_confirm(data);
1640                 if (status != 0)
1641                         return status;
1642         }
1643         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1644                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1645         return 0;
1646 }
1647
1648 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1649 {
1650         unsigned int loop;
1651         int ret;
1652
1653         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1654                 ret = nfs4_wait_clnt_recover(clp);
1655                 if (ret != 0)
1656                         break;
1657                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1658                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1659                         break;
1660                 nfs4_schedule_state_manager(clp);
1661                 ret = -EIO;
1662         }
1663         return ret;
1664 }
1665
1666 static int nfs4_recover_expired_lease(struct nfs_server *server)
1667 {
1668         return nfs4_client_recover_expired_lease(server->nfs_client);
1669 }
1670
1671 /*
1672  * OPEN_EXPIRED:
1673  *      reclaim state on the server after a network partition.
1674  *      Assumes caller holds the appropriate lock
1675  */
1676 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1677 {
1678         struct nfs4_opendata *opendata;
1679         int ret;
1680
1681         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1682         if (IS_ERR(opendata))
1683                 return PTR_ERR(opendata);
1684         ret = nfs4_open_recover(opendata, state);
1685         if (ret == -ESTALE)
1686                 d_drop(ctx->dentry);
1687         nfs4_opendata_put(opendata);
1688         return ret;
1689 }
1690
1691 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1692 {
1693         struct nfs_server *server = NFS_SERVER(state->inode);
1694         struct nfs4_exception exception = { };
1695         int err;
1696
1697         do {
1698                 err = _nfs4_open_expired(ctx, state);
1699                 switch (err) {
1700                 default:
1701                         goto out;
1702                 case -NFS4ERR_GRACE:
1703                 case -NFS4ERR_DELAY:
1704                         nfs4_handle_exception(server, err, &exception);
1705                         err = 0;
1706                 }
1707         } while (exception.retry);
1708 out:
1709         return err;
1710 }
1711
1712 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1713 {
1714         struct nfs_open_context *ctx;
1715         int ret;
1716
1717         ctx = nfs4_state_find_open_context(state);
1718         if (IS_ERR(ctx))
1719                 return PTR_ERR(ctx);
1720         ret = nfs4_do_open_expired(ctx, state);
1721         put_nfs_open_context(ctx);
1722         return ret;
1723 }
1724
1725 #if defined(CONFIG_NFS_V4_1)
1726 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1727 {
1728         int status;
1729         struct nfs_server *server = NFS_SERVER(state->inode);
1730
1731         status = nfs41_test_stateid(server, state);
1732         if (status == NFS_OK)
1733                 return 0;
1734         nfs41_free_stateid(server, state);
1735         return nfs4_open_expired(sp, state);
1736 }
1737 #endif
1738
1739 /*
1740  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1741  * fields corresponding to attributes that were used to store the verifier.
1742  * Make sure we clobber those fields in the later setattr call
1743  */
1744 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1745 {
1746         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1747             !(sattr->ia_valid & ATTR_ATIME_SET))
1748                 sattr->ia_valid |= ATTR_ATIME;
1749
1750         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1751             !(sattr->ia_valid & ATTR_MTIME_SET))
1752                 sattr->ia_valid |= ATTR_MTIME;
1753 }
1754
1755 /*
1756  * Returns a referenced nfs4_state
1757  */
1758 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1759 {
1760         struct nfs4_state_owner  *sp;
1761         struct nfs4_state     *state = NULL;
1762         struct nfs_server       *server = NFS_SERVER(dir);
1763         struct nfs4_opendata *opendata;
1764         int status;
1765
1766         /* Protect against reboot recovery conflicts */
1767         status = -ENOMEM;
1768         if (!(sp = nfs4_get_state_owner(server, cred))) {
1769                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1770                 goto out_err;
1771         }
1772         status = nfs4_recover_expired_lease(server);
1773         if (status != 0)
1774                 goto err_put_state_owner;
1775         if (dentry->d_inode != NULL)
1776                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1777         status = -ENOMEM;
1778         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1779         if (opendata == NULL)
1780                 goto err_put_state_owner;
1781
1782         if (dentry->d_inode != NULL)
1783                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1784
1785         status = _nfs4_proc_open(opendata);
1786         if (status != 0)
1787                 goto err_opendata_put;
1788
1789         state = nfs4_opendata_to_nfs4_state(opendata);
1790         status = PTR_ERR(state);
1791         if (IS_ERR(state))
1792                 goto err_opendata_put;
1793         if (server->caps & NFS_CAP_POSIX_LOCK)
1794                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1795
1796         if (opendata->o_arg.open_flags & O_EXCL) {
1797                 nfs4_exclusive_attrset(opendata, sattr);
1798
1799                 nfs_fattr_init(opendata->o_res.f_attr);
1800                 status = nfs4_do_setattr(state->inode, cred,
1801                                 opendata->o_res.f_attr, sattr,
1802                                 state);
1803                 if (status == 0)
1804                         nfs_setattr_update_inode(state->inode, sattr);
1805                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1806         }
1807         nfs_revalidate_inode(server, state->inode);
1808         nfs4_opendata_put(opendata);
1809         nfs4_put_state_owner(sp);
1810         *res = state;
1811         return 0;
1812 err_opendata_put:
1813         nfs4_opendata_put(opendata);
1814 err_put_state_owner:
1815         nfs4_put_state_owner(sp);
1816 out_err:
1817         *res = NULL;
1818         return status;
1819 }
1820
1821
1822 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1823 {
1824         struct nfs4_exception exception = { };
1825         struct nfs4_state *res;
1826         int status;
1827
1828         fmode &= FMODE_READ|FMODE_WRITE;
1829         do {
1830                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1831                 if (status == 0)
1832                         break;
1833                 /* NOTE: BAD_SEQID means the server and client disagree about the
1834                  * book-keeping w.r.t. state-changing operations
1835                  * (OPEN/CLOSE/LOCK/LOCKU...)
1836                  * It is actually a sign of a bug on the client or on the server.
1837                  *
1838                  * If we receive a BAD_SEQID error in the particular case of
1839                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1840                  * have unhashed the old state_owner for us, and that we can
1841                  * therefore safely retry using a new one. We should still warn
1842                  * the user though...
1843                  */
1844                 if (status == -NFS4ERR_BAD_SEQID) {
1845                         pr_warn_ratelimited("NFS: v4 server %s "
1846                                         " returned a bad sequence-id error!\n",
1847                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1848                         exception.retry = 1;
1849                         continue;
1850                 }
1851                 /*
1852                  * BAD_STATEID on OPEN means that the server cancelled our
1853                  * state before it received the OPEN_CONFIRM.
1854                  * Recover by retrying the request as per the discussion
1855                  * on Page 181 of RFC3530.
1856                  */
1857                 if (status == -NFS4ERR_BAD_STATEID) {
1858                         exception.retry = 1;
1859                         continue;
1860                 }
1861                 if (status == -EAGAIN) {
1862                         /* We must have found a delegation */
1863                         exception.retry = 1;
1864                         continue;
1865                 }
1866                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1867                                         status, &exception));
1868         } while (exception.retry);
1869         return res;
1870 }
1871
1872 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1873                             struct nfs_fattr *fattr, struct iattr *sattr,
1874                             struct nfs4_state *state)
1875 {
1876         struct nfs_server *server = NFS_SERVER(inode);
1877         struct nfs_setattrargs  arg = {
1878                 .fh             = NFS_FH(inode),
1879                 .iap            = sattr,
1880                 .server         = server,
1881                 .bitmask = server->attr_bitmask,
1882         };
1883         struct nfs_setattrres  res = {
1884                 .fattr          = fattr,
1885                 .server         = server,
1886         };
1887         struct rpc_message msg = {
1888                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1889                 .rpc_argp       = &arg,
1890                 .rpc_resp       = &res,
1891                 .rpc_cred       = cred,
1892         };
1893         unsigned long timestamp = jiffies;
1894         int status;
1895
1896         nfs_fattr_init(fattr);
1897
1898         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1899                 /* Use that stateid */
1900         } else if (state != NULL) {
1901                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1902         } else
1903                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1904
1905         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1906         if (status == 0 && state != NULL)
1907                 renew_lease(server, timestamp);
1908         return status;
1909 }
1910
1911 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1912                            struct nfs_fattr *fattr, struct iattr *sattr,
1913                            struct nfs4_state *state)
1914 {
1915         struct nfs_server *server = NFS_SERVER(inode);
1916         struct nfs4_exception exception = {
1917                 .state = state,
1918                 .inode = inode,
1919         };
1920         int err;
1921         do {
1922                 err = nfs4_handle_exception(server,
1923                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1924                                 &exception);
1925         } while (exception.retry);
1926         return err;
1927 }
1928
1929 struct nfs4_closedata {
1930         struct inode *inode;
1931         struct nfs4_state *state;
1932         struct nfs_closeargs arg;
1933         struct nfs_closeres res;
1934         struct nfs_fattr fattr;
1935         unsigned long timestamp;
1936         bool roc;
1937         u32 roc_barrier;
1938 };
1939
1940 static void nfs4_free_closedata(void *data)
1941 {
1942         struct nfs4_closedata *calldata = data;
1943         struct nfs4_state_owner *sp = calldata->state->owner;
1944         struct super_block *sb = calldata->state->inode->i_sb;
1945
1946         if (calldata->roc)
1947                 pnfs_roc_release(calldata->state->inode);
1948         nfs4_put_open_state(calldata->state);
1949         nfs_free_seqid(calldata->arg.seqid);
1950         nfs4_put_state_owner(sp);
1951         nfs_sb_deactive(sb);
1952         kfree(calldata);
1953 }
1954
1955 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1956                 fmode_t fmode)
1957 {
1958         spin_lock(&state->owner->so_lock);
1959         if (!(fmode & FMODE_READ))
1960                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1961         if (!(fmode & FMODE_WRITE))
1962                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1963         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1964         spin_unlock(&state->owner->so_lock);
1965 }
1966
1967 static void nfs4_close_done(struct rpc_task *task, void *data)
1968 {
1969         struct nfs4_closedata *calldata = data;
1970         struct nfs4_state *state = calldata->state;
1971         struct nfs_server *server = NFS_SERVER(calldata->inode);
1972
1973         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1974                 return;
1975         /* hmm. we are done with the inode, and in the process of freeing
1976          * the state_owner. we keep this around to process errors
1977          */
1978         switch (task->tk_status) {
1979                 case 0:
1980                         if (calldata->roc)
1981                                 pnfs_roc_set_barrier(state->inode,
1982                                                      calldata->roc_barrier);
1983                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1984                         renew_lease(server, calldata->timestamp);
1985                         nfs4_close_clear_stateid_flags(state,
1986                                         calldata->arg.fmode);
1987                         break;
1988                 case -NFS4ERR_STALE_STATEID:
1989                 case -NFS4ERR_OLD_STATEID:
1990                 case -NFS4ERR_BAD_STATEID:
1991                 case -NFS4ERR_EXPIRED:
1992                         if (calldata->arg.fmode == 0)
1993                                 break;
1994                 default:
1995                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1996                                 rpc_restart_call_prepare(task);
1997         }
1998         nfs_release_seqid(calldata->arg.seqid);
1999         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2000 }
2001
2002 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2003 {
2004         struct nfs4_closedata *calldata = data;
2005         struct nfs4_state *state = calldata->state;
2006         int call_close = 0;
2007
2008         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2009                 return;
2010
2011         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2012         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2013         spin_lock(&state->owner->so_lock);
2014         /* Calculate the change in open mode */
2015         if (state->n_rdwr == 0) {
2016                 if (state->n_rdonly == 0) {
2017                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2018                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2019                         calldata->arg.fmode &= ~FMODE_READ;
2020                 }
2021                 if (state->n_wronly == 0) {
2022                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2023                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2024                         calldata->arg.fmode &= ~FMODE_WRITE;
2025                 }
2026         }
2027         spin_unlock(&state->owner->so_lock);
2028
2029         if (!call_close) {
2030                 /* Note: exit _without_ calling nfs4_close_done */
2031                 task->tk_action = NULL;
2032                 return;
2033         }
2034
2035         if (calldata->arg.fmode == 0) {
2036                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2037                 if (calldata->roc &&
2038                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2039                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2040                                      task, NULL);
2041                         return;
2042                 }
2043         }
2044
2045         nfs_fattr_init(calldata->res.fattr);
2046         calldata->timestamp = jiffies;
2047         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2048                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2049                                 1, task))
2050                 return;
2051         rpc_call_start(task);
2052 }
2053
2054 static const struct rpc_call_ops nfs4_close_ops = {
2055         .rpc_call_prepare = nfs4_close_prepare,
2056         .rpc_call_done = nfs4_close_done,
2057         .rpc_release = nfs4_free_closedata,
2058 };
2059
2060 /*
2061  * It is possible for data to be read/written from a mem-mapped file
2062  * after the sys_close call (which hits the vfs layer as a flush).
2063  * This means that we can't safely call nfsv4 close on a file until
2064  * the inode is cleared. This in turn means that we are not good
2065  * NFSv4 citizens - we do not indicate to the server to update the file's
2066  * share state even when we are done with one of the three share
2067  * stateid's in the inode.
2068  *
2069  * NOTE: Caller must be holding the sp->so_owner semaphore!
2070  */
2071 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2072 {
2073         struct nfs_server *server = NFS_SERVER(state->inode);
2074         struct nfs4_closedata *calldata;
2075         struct nfs4_state_owner *sp = state->owner;
2076         struct rpc_task *task;
2077         struct rpc_message msg = {
2078                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2079                 .rpc_cred = state->owner->so_cred,
2080         };
2081         struct rpc_task_setup task_setup_data = {
2082                 .rpc_client = server->client,
2083                 .rpc_message = &msg,
2084                 .callback_ops = &nfs4_close_ops,
2085                 .workqueue = nfsiod_workqueue,
2086                 .flags = RPC_TASK_ASYNC,
2087         };
2088         int status = -ENOMEM;
2089
2090         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2091         if (calldata == NULL)
2092                 goto out;
2093         calldata->inode = state->inode;
2094         calldata->state = state;
2095         calldata->arg.fh = NFS_FH(state->inode);
2096         calldata->arg.stateid = &state->open_stateid;
2097         /* Serialization for the sequence id */
2098         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2099         if (calldata->arg.seqid == NULL)
2100                 goto out_free_calldata;
2101         calldata->arg.fmode = 0;
2102         calldata->arg.bitmask = server->cache_consistency_bitmask;
2103         calldata->res.fattr = &calldata->fattr;
2104         calldata->res.seqid = calldata->arg.seqid;
2105         calldata->res.server = server;
2106         calldata->roc = roc;
2107         nfs_sb_active(calldata->inode->i_sb);
2108
2109         msg.rpc_argp = &calldata->arg;
2110         msg.rpc_resp = &calldata->res;
2111         task_setup_data.callback_data = calldata;
2112         task = rpc_run_task(&task_setup_data);
2113         if (IS_ERR(task))
2114                 return PTR_ERR(task);
2115         status = 0;
2116         if (wait)
2117                 status = rpc_wait_for_completion_task(task);
2118         rpc_put_task(task);
2119         return status;
2120 out_free_calldata:
2121         kfree(calldata);
2122 out:
2123         if (roc)
2124                 pnfs_roc_release(state->inode);
2125         nfs4_put_open_state(state);
2126         nfs4_put_state_owner(sp);
2127         return status;
2128 }
2129
2130 static struct inode *
2131 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2132 {
2133         struct nfs4_state *state;
2134
2135         /* Protect against concurrent sillydeletes */
2136         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2137         if (IS_ERR(state))
2138                 return ERR_CAST(state);
2139         ctx->state = state;
2140         return igrab(state->inode);
2141 }
2142
2143 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2144 {
2145         if (ctx->state == NULL)
2146                 return;
2147         if (is_sync)
2148                 nfs4_close_sync(ctx->state, ctx->mode);
2149         else
2150                 nfs4_close_state(ctx->state, ctx->mode);
2151 }
2152
2153 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2154 {
2155         struct nfs4_server_caps_arg args = {
2156                 .fhandle = fhandle,
2157         };
2158         struct nfs4_server_caps_res res = {};
2159         struct rpc_message msg = {
2160                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2161                 .rpc_argp = &args,
2162                 .rpc_resp = &res,
2163         };
2164         int status;
2165
2166         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2167         if (status == 0) {
2168                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2169                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2170                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2171                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2172                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2173                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2174                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2175                         server->caps |= NFS_CAP_ACLS;
2176                 if (res.has_links != 0)
2177                         server->caps |= NFS_CAP_HARDLINKS;
2178                 if (res.has_symlinks != 0)
2179                         server->caps |= NFS_CAP_SYMLINKS;
2180                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2181                         server->caps |= NFS_CAP_FILEID;
2182                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2183                         server->caps |= NFS_CAP_MODE;
2184                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2185                         server->caps |= NFS_CAP_NLINK;
2186                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2187                         server->caps |= NFS_CAP_OWNER;
2188                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2189                         server->caps |= NFS_CAP_OWNER_GROUP;
2190                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2191                         server->caps |= NFS_CAP_ATIME;
2192                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2193                         server->caps |= NFS_CAP_CTIME;
2194                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2195                         server->caps |= NFS_CAP_MTIME;
2196
2197                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2198                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2199                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2200                 server->acl_bitmask = res.acl_bitmask;
2201         }
2202
2203         return status;
2204 }
2205
2206 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2207 {
2208         struct nfs4_exception exception = { };
2209         int err;
2210         do {
2211                 err = nfs4_handle_exception(server,
2212                                 _nfs4_server_capabilities(server, fhandle),
2213                                 &exception);
2214         } while (exception.retry);
2215         return err;
2216 }
2217
2218 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2219                 struct nfs_fsinfo *info)
2220 {
2221         struct nfs4_lookup_root_arg args = {
2222                 .bitmask = nfs4_fattr_bitmap,
2223         };
2224         struct nfs4_lookup_res res = {
2225                 .server = server,
2226                 .fattr = info->fattr,
2227                 .fh = fhandle,
2228         };
2229         struct rpc_message msg = {
2230                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2231                 .rpc_argp = &args,
2232                 .rpc_resp = &res,
2233         };
2234
2235         nfs_fattr_init(info->fattr);
2236         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2237 }
2238
2239 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2240                 struct nfs_fsinfo *info)
2241 {
2242         struct nfs4_exception exception = { };
2243         int err;
2244         do {
2245                 err = _nfs4_lookup_root(server, fhandle, info);
2246                 switch (err) {
2247                 case 0:
2248                 case -NFS4ERR_WRONGSEC:
2249                         goto out;
2250                 default:
2251                         err = nfs4_handle_exception(server, err, &exception);
2252                 }
2253         } while (exception.retry);
2254 out:
2255         return err;
2256 }
2257
2258 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2259                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2260 {
2261         struct rpc_auth *auth;
2262         int ret;
2263
2264         auth = rpcauth_create(flavor, server->client);
2265         if (!auth) {
2266                 ret = -EIO;
2267                 goto out;
2268         }
2269         ret = nfs4_lookup_root(server, fhandle, info);
2270 out:
2271         return ret;
2272 }
2273
2274 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2275                               struct nfs_fsinfo *info)
2276 {
2277         int i, len, status = 0;
2278         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2279
2280         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2281         flav_array[len] = RPC_AUTH_NULL;
2282         len += 1;
2283
2284         for (i = 0; i < len; i++) {
2285                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2286                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2287                         continue;
2288                 break;
2289         }
2290         /*
2291          * -EACCESS could mean that the user doesn't have correct permissions
2292          * to access the mount.  It could also mean that we tried to mount
2293          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2294          * existing mount programs don't handle -EACCES very well so it should
2295          * be mapped to -EPERM instead.
2296          */
2297         if (status == -EACCES)
2298                 status = -EPERM;
2299         return status;
2300 }
2301
2302 /*
2303  * get the file handle for the "/" directory on the server
2304  */
2305 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2306                               struct nfs_fsinfo *info)
2307 {
2308         int minor_version = server->nfs_client->cl_minorversion;
2309         int status = nfs4_lookup_root(server, fhandle, info);
2310         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2311                 /*
2312                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2313                  * by nfs4_map_errors() as this function exits.
2314                  */
2315                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2316         if (status == 0)
2317                 status = nfs4_server_capabilities(server, fhandle);
2318         if (status == 0)
2319                 status = nfs4_do_fsinfo(server, fhandle, info);
2320         return nfs4_map_errors(status);
2321 }
2322
2323 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2324 /*
2325  * Get locations and (maybe) other attributes of a referral.
2326  * Note that we'll actually follow the referral later when
2327  * we detect fsid mismatch in inode revalidation
2328  */
2329 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2330                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2331 {
2332         int status = -ENOMEM;
2333         struct page *page = NULL;
2334         struct nfs4_fs_locations *locations = NULL;
2335
2336         page = alloc_page(GFP_KERNEL);
2337         if (page == NULL)
2338                 goto out;
2339         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2340         if (locations == NULL)
2341                 goto out;
2342
2343         status = nfs4_proc_fs_locations(dir, name, locations, page);
2344         if (status != 0)
2345                 goto out;
2346         /* Make sure server returned a different fsid for the referral */
2347         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2348                 dprintk("%s: server did not return a different fsid for"
2349                         " a referral at %s\n", __func__, name->name);
2350                 status = -EIO;
2351                 goto out;
2352         }
2353         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2354         nfs_fixup_referral_attributes(&locations->fattr);
2355
2356         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2357         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2358         memset(fhandle, 0, sizeof(struct nfs_fh));
2359 out:
2360         if (page)
2361                 __free_page(page);
2362         kfree(locations);
2363         return status;
2364 }
2365
2366 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2367 {
2368         struct nfs4_getattr_arg args = {
2369                 .fh = fhandle,
2370                 .bitmask = server->attr_bitmask,
2371         };
2372         struct nfs4_getattr_res res = {
2373                 .fattr = fattr,
2374                 .server = server,
2375         };
2376         struct rpc_message msg = {
2377                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2378                 .rpc_argp = &args,
2379                 .rpc_resp = &res,
2380         };
2381
2382         nfs_fattr_init(fattr);
2383         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2384 }
2385
2386 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2387 {
2388         struct nfs4_exception exception = { };
2389         int err;
2390         do {
2391                 err = nfs4_handle_exception(server,
2392                                 _nfs4_proc_getattr(server, fhandle, fattr),
2393                                 &exception);
2394         } while (exception.retry);
2395         return err;
2396 }
2397
2398 /*
2399  * The file is not closed if it is opened due to the a request to change
2400  * the size of the file. The open call will not be needed once the
2401  * VFS layer lookup-intents are implemented.
2402  *
2403  * Close is called when the inode is destroyed.
2404  * If we haven't opened the file for O_WRONLY, we
2405  * need to in the size_change case to obtain a stateid.
2406  *
2407  * Got race?
2408  * Because OPEN is always done by name in nfsv4, it is
2409  * possible that we opened a different file by the same
2410  * name.  We can recognize this race condition, but we
2411  * can't do anything about it besides returning an error.
2412  *
2413  * This will be fixed with VFS changes (lookup-intent).
2414  */
2415 static int
2416 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2417                   struct iattr *sattr)
2418 {
2419         struct inode *inode = dentry->d_inode;
2420         struct rpc_cred *cred = NULL;
2421         struct nfs4_state *state = NULL;
2422         int status;
2423
2424         if (pnfs_ld_layoutret_on_setattr(inode))
2425                 pnfs_return_layout(inode);
2426
2427         nfs_fattr_init(fattr);
2428
2429         /* Search for an existing open(O_WRITE) file */
2430         if (sattr->ia_valid & ATTR_FILE) {
2431                 struct nfs_open_context *ctx;
2432
2433                 ctx = nfs_file_open_context(sattr->ia_file);
2434                 if (ctx) {
2435                         cred = ctx->cred;
2436                         state = ctx->state;
2437                 }
2438         }
2439
2440         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2441         if (status == 0)
2442                 nfs_setattr_update_inode(inode, sattr);
2443         return status;
2444 }
2445
2446 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2447                 const struct qstr *name, struct nfs_fh *fhandle,
2448                 struct nfs_fattr *fattr)
2449 {
2450         struct nfs_server *server = NFS_SERVER(dir);
2451         int                    status;
2452         struct nfs4_lookup_arg args = {
2453                 .bitmask = server->attr_bitmask,
2454                 .dir_fh = NFS_FH(dir),
2455                 .name = name,
2456         };
2457         struct nfs4_lookup_res res = {
2458                 .server = server,
2459                 .fattr = fattr,
2460                 .fh = fhandle,
2461         };
2462         struct rpc_message msg = {
2463                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2464                 .rpc_argp = &args,
2465                 .rpc_resp = &res,
2466         };
2467
2468         nfs_fattr_init(fattr);
2469
2470         dprintk("NFS call  lookup %s\n", name->name);
2471         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2472         dprintk("NFS reply lookup: %d\n", status);
2473         return status;
2474 }
2475
2476 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2477 {
2478         memset(fh, 0, sizeof(struct nfs_fh));
2479         fattr->fsid.major = 1;
2480         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2481                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2482         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2483         fattr->nlink = 2;
2484 }
2485
2486 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2487                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2488 {
2489         struct nfs4_exception exception = { };
2490         int err;
2491         do {
2492                 int status;
2493
2494                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2495                 switch (status) {
2496                 case -NFS4ERR_BADNAME:
2497                         return -ENOENT;
2498                 case -NFS4ERR_MOVED:
2499                         return nfs4_get_referral(dir, name, fattr, fhandle);
2500                 case -NFS4ERR_WRONGSEC:
2501                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2502                 }
2503                 err = nfs4_handle_exception(NFS_SERVER(dir),
2504                                 status, &exception);
2505         } while (exception.retry);
2506         return err;
2507 }
2508
2509 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2510 {
2511         struct nfs_server *server = NFS_SERVER(inode);
2512         struct nfs4_accessargs args = {
2513                 .fh = NFS_FH(inode),
2514                 .bitmask = server->attr_bitmask,
2515         };
2516         struct nfs4_accessres res = {
2517                 .server = server,
2518         };
2519         struct rpc_message msg = {
2520                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2521                 .rpc_argp = &args,
2522                 .rpc_resp = &res,
2523                 .rpc_cred = entry->cred,
2524         };
2525         int mode = entry->mask;
2526         int status;
2527
2528         /*
2529          * Determine which access bits we want to ask for...
2530          */
2531         if (mode & MAY_READ)
2532                 args.access |= NFS4_ACCESS_READ;
2533         if (S_ISDIR(inode->i_mode)) {
2534                 if (mode & MAY_WRITE)
2535                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2536                 if (mode & MAY_EXEC)
2537                         args.access |= NFS4_ACCESS_LOOKUP;
2538         } else {
2539                 if (mode & MAY_WRITE)
2540                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2541                 if (mode & MAY_EXEC)
2542                         args.access |= NFS4_ACCESS_EXECUTE;
2543         }
2544
2545         res.fattr = nfs_alloc_fattr();
2546         if (res.fattr == NULL)
2547                 return -ENOMEM;
2548
2549         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2550         if (!status) {
2551                 entry->mask = 0;
2552                 if (res.access & NFS4_ACCESS_READ)
2553                         entry->mask |= MAY_READ;
2554                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2555                         entry->mask |= MAY_WRITE;
2556                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2557                         entry->mask |= MAY_EXEC;
2558                 nfs_refresh_inode(inode, res.fattr);
2559         }
2560         nfs_free_fattr(res.fattr);
2561         return status;
2562 }
2563
2564 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2565 {
2566         struct nfs4_exception exception = { };
2567         int err;
2568         do {
2569                 err = nfs4_handle_exception(NFS_SERVER(inode),
2570                                 _nfs4_proc_access(inode, entry),
2571                                 &exception);
2572         } while (exception.retry);
2573         return err;
2574 }
2575
2576 /*
2577  * TODO: For the time being, we don't try to get any attributes
2578  * along with any of the zero-copy operations READ, READDIR,
2579  * READLINK, WRITE.
2580  *
2581  * In the case of the first three, we want to put the GETATTR
2582  * after the read-type operation -- this is because it is hard
2583  * to predict the length of a GETATTR response in v4, and thus
2584  * align the READ data correctly.  This means that the GETATTR
2585  * may end up partially falling into the page cache, and we should
2586  * shift it into the 'tail' of the xdr_buf before processing.
2587  * To do this efficiently, we need to know the total length
2588  * of data received, which doesn't seem to be available outside
2589  * of the RPC layer.
2590  *
2591  * In the case of WRITE, we also want to put the GETATTR after
2592  * the operation -- in this case because we want to make sure
2593  * we get the post-operation mtime and size.  This means that
2594  * we can't use xdr_encode_pages() as written: we need a variant
2595  * of it which would leave room in the 'tail' iovec.
2596  *
2597  * Both of these changes to the XDR layer would in fact be quite
2598  * minor, but I decided to leave them for a subsequent patch.
2599  */
2600 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2601                 unsigned int pgbase, unsigned int pglen)
2602 {
2603         struct nfs4_readlink args = {
2604                 .fh       = NFS_FH(inode),
2605                 .pgbase   = pgbase,
2606                 .pglen    = pglen,
2607                 .pages    = &page,
2608         };
2609         struct nfs4_readlink_res res;
2610         struct rpc_message msg = {
2611                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2612                 .rpc_argp = &args,
2613                 .rpc_resp = &res,
2614         };
2615
2616         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2617 }
2618
2619 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2620                 unsigned int pgbase, unsigned int pglen)
2621 {
2622         struct nfs4_exception exception = { };
2623         int err;
2624         do {
2625                 err = nfs4_handle_exception(NFS_SERVER(inode),
2626                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2627                                 &exception);
2628         } while (exception.retry);
2629         return err;
2630 }
2631
2632 /*
2633  * Got race?
2634  * We will need to arrange for the VFS layer to provide an atomic open.
2635  * Until then, this create/open method is prone to inefficiency and race
2636  * conditions due to the lookup, create, and open VFS calls from sys_open()
2637  * placed on the wire.
2638  *
2639  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2640  * The file will be opened again in the subsequent VFS open call
2641  * (nfs4_proc_file_open).
2642  *
2643  * The open for read will just hang around to be used by any process that
2644  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2645  */
2646
2647 static int
2648 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2649                  int flags, struct nfs_open_context *ctx)
2650 {
2651         struct dentry *de = dentry;
2652         struct nfs4_state *state;
2653         struct rpc_cred *cred = NULL;
2654         fmode_t fmode = 0;
2655         int status = 0;
2656
2657         if (ctx != NULL) {
2658                 cred = ctx->cred;
2659                 de = ctx->dentry;
2660                 fmode = ctx->mode;
2661         }
2662         sattr->ia_mode &= ~current_umask();
2663         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2664         d_drop(dentry);
2665         if (IS_ERR(state)) {
2666                 status = PTR_ERR(state);
2667                 goto out;
2668         }
2669         d_add(dentry, igrab(state->inode));
2670         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2671         if (ctx != NULL)
2672                 ctx->state = state;
2673         else
2674                 nfs4_close_sync(state, fmode);
2675 out:
2676         return status;
2677 }
2678
2679 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2680 {
2681         struct nfs_server *server = NFS_SERVER(dir);
2682         struct nfs_removeargs args = {
2683                 .fh = NFS_FH(dir),
2684                 .name.len = name->len,
2685                 .name.name = name->name,
2686                 .bitmask = server->attr_bitmask,
2687         };
2688         struct nfs_removeres res = {
2689                 .server = server,
2690         };
2691         struct rpc_message msg = {
2692                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2693                 .rpc_argp = &args,
2694                 .rpc_resp = &res,
2695         };
2696         int status = -ENOMEM;
2697
2698         res.dir_attr = nfs_alloc_fattr();
2699         if (res.dir_attr == NULL)
2700                 goto out;
2701
2702         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2703         if (status == 0) {
2704                 update_changeattr(dir, &res.cinfo);
2705                 nfs_post_op_update_inode(dir, res.dir_attr);
2706         }
2707         nfs_free_fattr(res.dir_attr);
2708 out:
2709         return status;
2710 }
2711
2712 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2713 {
2714         struct nfs4_exception exception = { };
2715         int err;
2716         do {
2717                 err = nfs4_handle_exception(NFS_SERVER(dir),
2718                                 _nfs4_proc_remove(dir, name),
2719                                 &exception);
2720         } while (exception.retry);
2721         return err;
2722 }
2723
2724 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2725 {
2726         struct nfs_server *server = NFS_SERVER(dir);
2727         struct nfs_removeargs *args = msg->rpc_argp;
2728         struct nfs_removeres *res = msg->rpc_resp;
2729
2730         args->bitmask = server->cache_consistency_bitmask;
2731         res->server = server;
2732         res->seq_res.sr_slot = NULL;
2733         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2734 }
2735
2736 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2737 {
2738         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2739
2740         if (!nfs4_sequence_done(task, &res->seq_res))
2741                 return 0;
2742         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2743                 return 0;
2744         update_changeattr(dir, &res->cinfo);
2745         nfs_post_op_update_inode(dir, res->dir_attr);
2746         return 1;
2747 }
2748
2749 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2750 {
2751         struct nfs_server *server = NFS_SERVER(dir);
2752         struct nfs_renameargs *arg = msg->rpc_argp;
2753         struct nfs_renameres *res = msg->rpc_resp;
2754
2755         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2756         arg->bitmask = server->attr_bitmask;
2757         res->server = server;
2758 }
2759
2760 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2761                                  struct inode *new_dir)
2762 {
2763         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2764
2765         if (!nfs4_sequence_done(task, &res->seq_res))
2766                 return 0;
2767         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2768                 return 0;
2769
2770         update_changeattr(old_dir, &res->old_cinfo);
2771         nfs_post_op_update_inode(old_dir, res->old_fattr);
2772         update_changeattr(new_dir, &res->new_cinfo);
2773         nfs_post_op_update_inode(new_dir, res->new_fattr);
2774         return 1;
2775 }
2776
2777 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2778                 struct inode *new_dir, struct qstr *new_name)
2779 {
2780         struct nfs_server *server = NFS_SERVER(old_dir);
2781         struct nfs_renameargs arg = {
2782                 .old_dir = NFS_FH(old_dir),
2783                 .new_dir = NFS_FH(new_dir),
2784                 .old_name = old_name,
2785                 .new_name = new_name,
2786                 .bitmask = server->attr_bitmask,
2787         };
2788         struct nfs_renameres res = {
2789                 .server = server,
2790         };
2791         struct rpc_message msg = {
2792                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2793                 .rpc_argp = &arg,
2794                 .rpc_resp = &res,
2795         };
2796         int status = -ENOMEM;
2797
2798         res.old_fattr = nfs_alloc_fattr();
2799         res.new_fattr = nfs_alloc_fattr();
2800         if (res.old_fattr == NULL || res.new_fattr == NULL)
2801                 goto out;
2802
2803         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2804         if (!status) {
2805                 update_changeattr(old_dir, &res.old_cinfo);
2806                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2807                 update_changeattr(new_dir, &res.new_cinfo);
2808                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2809         }
2810 out:
2811         nfs_free_fattr(res.new_fattr);
2812         nfs_free_fattr(res.old_fattr);
2813         return status;
2814 }
2815
2816 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2817                 struct inode *new_dir, struct qstr *new_name)
2818 {
2819         struct nfs4_exception exception = { };
2820         int err;
2821         do {
2822                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2823                                 _nfs4_proc_rename(old_dir, old_name,
2824                                         new_dir, new_name),
2825                                 &exception);
2826         } while (exception.retry);
2827         return err;
2828 }
2829
2830 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2831 {
2832         struct nfs_server *server = NFS_SERVER(inode);
2833         struct nfs4_link_arg arg = {
2834                 .fh     = NFS_FH(inode),
2835                 .dir_fh = NFS_FH(dir),
2836                 .name   = name,
2837                 .bitmask = server->attr_bitmask,
2838         };
2839         struct nfs4_link_res res = {
2840                 .server = server,
2841         };
2842         struct rpc_message msg = {
2843                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2844                 .rpc_argp = &arg,
2845                 .rpc_resp = &res,
2846         };
2847         int status = -ENOMEM;
2848
2849         res.fattr = nfs_alloc_fattr();
2850         res.dir_attr = nfs_alloc_fattr();
2851         if (res.fattr == NULL || res.dir_attr == NULL)
2852                 goto out;
2853
2854         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2855         if (!status) {
2856                 update_changeattr(dir, &res.cinfo);
2857                 nfs_post_op_update_inode(dir, res.dir_attr);
2858                 nfs_post_op_update_inode(inode, res.fattr);
2859         }
2860 out:
2861         nfs_free_fattr(res.dir_attr);
2862         nfs_free_fattr(res.fattr);
2863         return status;
2864 }
2865
2866 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2867 {
2868         struct nfs4_exception exception = { };
2869         int err;
2870         do {
2871                 err = nfs4_handle_exception(NFS_SERVER(inode),
2872                                 _nfs4_proc_link(inode, dir, name),
2873                                 &exception);
2874         } while (exception.retry);
2875         return err;
2876 }
2877
2878 struct nfs4_createdata {
2879         struct rpc_message msg;
2880         struct nfs4_create_arg arg;
2881         struct nfs4_create_res res;
2882         struct nfs_fh fh;
2883         struct nfs_fattr fattr;
2884         struct nfs_fattr dir_fattr;
2885 };
2886
2887 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2888                 struct qstr *name, struct iattr *sattr, u32 ftype)
2889 {
2890         struct nfs4_createdata *data;
2891
2892         data = kzalloc(sizeof(*data), GFP_KERNEL);
2893         if (data != NULL) {
2894                 struct nfs_server *server = NFS_SERVER(dir);
2895
2896                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2897                 data->msg.rpc_argp = &data->arg;
2898                 data->msg.rpc_resp = &data->res;
2899                 data->arg.dir_fh = NFS_FH(dir);
2900                 data->arg.server = server;
2901                 data->arg.name = name;
2902                 data->arg.attrs = sattr;
2903                 data->arg.ftype = ftype;
2904                 data->arg.bitmask = server->attr_bitmask;
2905                 data->res.server = server;
2906                 data->res.fh = &data->fh;
2907                 data->res.fattr = &data->fattr;
2908                 data->res.dir_fattr = &data->dir_fattr;
2909                 nfs_fattr_init(data->res.fattr);
2910                 nfs_fattr_init(data->res.dir_fattr);
2911         }
2912         return data;
2913 }
2914
2915 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2916 {
2917         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2918                                     &data->arg.seq_args, &data->res.seq_res, 1);
2919         if (status == 0) {
2920                 update_changeattr(dir, &data->res.dir_cinfo);
2921                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2922                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2923         }
2924         return status;
2925 }
2926
2927 static void nfs4_free_createdata(struct nfs4_createdata *data)
2928 {
2929         kfree(data);
2930 }
2931
2932 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2933                 struct page *page, unsigned int len, struct iattr *sattr)
2934 {
2935         struct nfs4_createdata *data;
2936         int status = -ENAMETOOLONG;
2937
2938         if (len > NFS4_MAXPATHLEN)
2939                 goto out;
2940
2941         status = -ENOMEM;
2942         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2943         if (data == NULL)
2944                 goto out;
2945
2946         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2947         data->arg.u.symlink.pages = &page;
2948         data->arg.u.symlink.len = len;
2949
2950         status = nfs4_do_create(dir, dentry, data);
2951
2952         nfs4_free_createdata(data);
2953 out:
2954         return status;
2955 }
2956
2957 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2958                 struct page *page, unsigned int len, struct iattr *sattr)
2959 {
2960         struct nfs4_exception exception = { };
2961         int err;
2962         do {
2963                 err = nfs4_handle_exception(NFS_SERVER(dir),
2964                                 _nfs4_proc_symlink(dir, dentry, page,
2965                                                         len, sattr),
2966                                 &exception);
2967         } while (exception.retry);
2968         return err;
2969 }
2970
2971 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2972                 struct iattr *sattr)
2973 {
2974         struct nfs4_createdata *data;
2975         int status = -ENOMEM;
2976
2977         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2978         if (data == NULL)
2979                 goto out;
2980
2981         status = nfs4_do_create(dir, dentry, data);
2982
2983         nfs4_free_createdata(data);
2984 out:
2985         return status;
2986 }
2987
2988 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2989                 struct iattr *sattr)
2990 {
2991         struct nfs4_exception exception = { };
2992         int err;
2993
2994         sattr->ia_mode &= ~current_umask();
2995         do {
2996                 err = nfs4_handle_exception(NFS_SERVER(dir),
2997                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2998                                 &exception);
2999         } while (exception.retry);
3000         return err;
3001 }
3002
3003 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3004                 u64 cookie, struct page **pages, unsigned int count, int plus)
3005 {
3006         struct inode            *dir = dentry->d_inode;
3007         struct nfs4_readdir_arg args = {
3008                 .fh = NFS_FH(dir),
3009                 .pages = pages,
3010                 .pgbase = 0,
3011                 .count = count,
3012                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3013                 .plus = plus,
3014         };
3015         struct nfs4_readdir_res res;
3016         struct rpc_message msg = {
3017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3018                 .rpc_argp = &args,
3019                 .rpc_resp = &res,
3020                 .rpc_cred = cred,
3021         };
3022         int                     status;
3023
3024         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3025                         dentry->d_parent->d_name.name,
3026                         dentry->d_name.name,
3027                         (unsigned long long)cookie);
3028         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3029         res.pgbase = args.pgbase;
3030         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3031         if (status >= 0) {
3032                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3033                 status += args.pgbase;
3034         }
3035
3036         nfs_invalidate_atime(dir);
3037
3038         dprintk("%s: returns %d\n", __func__, status);
3039         return status;
3040 }
3041
3042 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3043                 u64 cookie, struct page **pages, unsigned int count, int plus)
3044 {
3045         struct nfs4_exception exception = { };
3046         int err;
3047         do {
3048                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3049                                 _nfs4_proc_readdir(dentry, cred, cookie,
3050                                         pages, count, plus),
3051                                 &exception);
3052         } while (exception.retry);
3053         return err;
3054 }
3055
3056 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3057                 struct iattr *sattr, dev_t rdev)
3058 {
3059         struct nfs4_createdata *data;
3060         int mode = sattr->ia_mode;
3061         int status = -ENOMEM;
3062
3063         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3064         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3065
3066         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3067         if (data == NULL)
3068                 goto out;
3069
3070         if (S_ISFIFO(mode))
3071                 data->arg.ftype = NF4FIFO;
3072         else if (S_ISBLK(mode)) {
3073                 data->arg.ftype = NF4BLK;
3074                 data->arg.u.device.specdata1 = MAJOR(rdev);
3075                 data->arg.u.device.specdata2 = MINOR(rdev);
3076         }
3077         else if (S_ISCHR(mode)) {
3078                 data->arg.ftype = NF4CHR;
3079                 data->arg.u.device.specdata1 = MAJOR(rdev);
3080                 data->arg.u.device.specdata2 = MINOR(rdev);
3081         }
3082
3083         status = nfs4_do_create(dir, dentry, data);
3084
3085         nfs4_free_createdata(data);
3086 out:
3087         return status;
3088 }
3089
3090 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3091                 struct iattr *sattr, dev_t rdev)
3092 {
3093         struct nfs4_exception exception = { };
3094         int err;
3095
3096         sattr->ia_mode &= ~current_umask();
3097         do {
3098                 err = nfs4_handle_exception(NFS_SERVER(dir),
3099                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3100                                 &exception);
3101         } while (exception.retry);
3102         return err;
3103 }
3104
3105 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3106                  struct nfs_fsstat *fsstat)
3107 {
3108         struct nfs4_statfs_arg args = {
3109                 .fh = fhandle,
3110                 .bitmask = server->attr_bitmask,
3111         };
3112         struct nfs4_statfs_res res = {
3113                 .fsstat = fsstat,
3114         };
3115         struct rpc_message msg = {
3116                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3117                 .rpc_argp = &args,
3118                 .rpc_resp = &res,
3119         };
3120
3121         nfs_fattr_init(fsstat->fattr);
3122         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3123 }
3124
3125 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3126 {
3127         struct nfs4_exception exception = { };
3128         int err;
3129         do {
3130                 err = nfs4_handle_exception(server,
3131                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3132                                 &exception);
3133         } while (exception.retry);
3134         return err;
3135 }
3136
3137 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3138                 struct nfs_fsinfo *fsinfo)
3139 {
3140         struct nfs4_fsinfo_arg args = {
3141                 .fh = fhandle,
3142                 .bitmask = server->attr_bitmask,
3143         };
3144         struct nfs4_fsinfo_res res = {
3145                 .fsinfo = fsinfo,
3146         };
3147         struct rpc_message msg = {
3148                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3149                 .rpc_argp = &args,
3150                 .rpc_resp = &res,
3151         };
3152
3153         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3154 }
3155
3156 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3157 {
3158         struct nfs4_exception exception = { };
3159         int err;
3160
3161         do {
3162                 err = nfs4_handle_exception(server,
3163                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3164                                 &exception);
3165         } while (exception.retry);
3166         return err;
3167 }
3168
3169 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3170 {
3171         nfs_fattr_init(fsinfo->fattr);
3172         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3173 }
3174
3175 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3176                 struct nfs_pathconf *pathconf)
3177 {
3178         struct nfs4_pathconf_arg args = {
3179                 .fh = fhandle,
3180                 .bitmask = server->attr_bitmask,
3181         };
3182         struct nfs4_pathconf_res res = {
3183                 .pathconf = pathconf,
3184         };
3185         struct rpc_message msg = {
3186                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3187                 .rpc_argp = &args,
3188                 .rpc_resp = &res,
3189         };
3190
3191         /* None of the pathconf attributes are mandatory to implement */
3192         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3193                 memset(pathconf, 0, sizeof(*pathconf));
3194                 return 0;
3195         }
3196
3197         nfs_fattr_init(pathconf->fattr);
3198         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3199 }
3200
3201 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3202                 struct nfs_pathconf *pathconf)
3203 {
3204         struct nfs4_exception exception = { };
3205         int err;
3206
3207         do {
3208                 err = nfs4_handle_exception(server,
3209                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3210                                 &exception);
3211         } while (exception.retry);
3212         return err;
3213 }
3214
3215 void __nfs4_read_done_cb(struct nfs_read_data *data)
3216 {
3217         nfs_invalidate_atime(data->inode);
3218 }
3219
3220 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3221 {
3222         struct nfs_server *server = NFS_SERVER(data->inode);
3223
3224         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3225                 rpc_restart_call_prepare(task);
3226                 return -EAGAIN;
3227         }
3228
3229         __nfs4_read_done_cb(data);
3230         if (task->tk_status > 0)
3231                 renew_lease(server, data->timestamp);
3232         return 0;
3233 }
3234
3235 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3236 {
3237
3238         dprintk("--> %s\n", __func__);
3239
3240         if (!nfs4_sequence_done(task, &data->res.seq_res))
3241                 return -EAGAIN;
3242
3243         return data->read_done_cb ? data->read_done_cb(task, data) :
3244                                     nfs4_read_done_cb(task, data);
3245 }
3246
3247 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3248 {
3249         data->timestamp   = jiffies;
3250         data->read_done_cb = nfs4_read_done_cb;
3251         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3252 }
3253
3254 /* Reset the the nfs_read_data to send the read to the MDS. */
3255 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3256 {
3257         dprintk("%s Reset task for i/o through\n", __func__);
3258         put_lseg(data->lseg);
3259         data->lseg = NULL;
3260         /* offsets will differ in the dense stripe case */
3261         data->args.offset = data->mds_offset;
3262         data->ds_clp = NULL;
3263         data->args.fh     = NFS_FH(data->inode);
3264         data->read_done_cb = nfs4_read_done_cb;
3265         task->tk_ops = data->mds_ops;
3266         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3267 }
3268 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3269
3270 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3271 {
3272         struct inode *inode = data->inode;
3273
3274         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3275                 rpc_restart_call_prepare(task);
3276                 return -EAGAIN;
3277         }
3278         if (task->tk_status >= 0) {
3279                 renew_lease(NFS_SERVER(inode), data->timestamp);
3280                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3281         }
3282         return 0;
3283 }
3284
3285 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3286 {
3287         if (!nfs4_sequence_done(task, &data->res.seq_res))
3288                 return -EAGAIN;
3289         return data->write_done_cb ? data->write_done_cb(task, data) :
3290                 nfs4_write_done_cb(task, data);
3291 }
3292
3293 /* Reset the the nfs_write_data to send the write to the MDS. */
3294 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3295 {
3296         dprintk("%s Reset task for i/o through\n", __func__);
3297         put_lseg(data->lseg);
3298         data->lseg          = NULL;
3299         data->ds_clp        = NULL;
3300         data->write_done_cb = nfs4_write_done_cb;
3301         data->args.fh       = NFS_FH(data->inode);
3302         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3303         data->args.offset   = data->mds_offset;
3304         data->res.fattr     = &data->fattr;
3305         task->tk_ops        = data->mds_ops;
3306         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3307 }
3308 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3309
3310 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3311 {
3312         struct nfs_server *server = NFS_SERVER(data->inode);
3313
3314         if (data->lseg) {
3315                 data->args.bitmask = NULL;
3316                 data->res.fattr = NULL;
3317         } else
3318                 data->args.bitmask = server->cache_consistency_bitmask;
3319         if (!data->write_done_cb)
3320                 data->write_done_cb = nfs4_write_done_cb;
3321         data->res.server = server;
3322         data->timestamp   = jiffies;
3323
3324         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3325 }
3326
3327 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3328 {
3329         struct inode *inode = data->inode;
3330
3331         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3332                 rpc_restart_call_prepare(task);
3333                 return -EAGAIN;
3334         }
3335         nfs_refresh_inode(inode, data->res.fattr);
3336         return 0;
3337 }
3338
3339 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3340 {
3341         if (!nfs4_sequence_done(task, &data->res.seq_res))
3342                 return -EAGAIN;
3343         return data->write_done_cb(task, data);
3344 }
3345
3346 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3347 {
3348         struct nfs_server *server = NFS_SERVER(data->inode);
3349
3350         if (data->lseg) {
3351                 data->args.bitmask = NULL;
3352                 data->res.fattr = NULL;
3353         } else
3354                 data->args.bitmask = server->cache_consistency_bitmask;
3355         if (!data->write_done_cb)
3356                 data->write_done_cb = nfs4_commit_done_cb;
3357         data->res.server = server;
3358         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3359 }
3360
3361 struct nfs4_renewdata {
3362         struct nfs_client       *client;
3363         unsigned long           timestamp;
3364 };
3365
3366 /*
3367  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3368  * standalone procedure for queueing an asynchronous RENEW.
3369  */
3370 static void nfs4_renew_release(void *calldata)
3371 {
3372         struct nfs4_renewdata *data = calldata;
3373         struct nfs_client *clp = data->client;
3374
3375         if (atomic_read(&clp->cl_count) > 1)
3376                 nfs4_schedule_state_renewal(clp);
3377         nfs_put_client(clp);
3378         kfree(data);
3379 }
3380
3381 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3382 {
3383         struct nfs4_renewdata *data = calldata;
3384         struct nfs_client *clp = data->client;
3385         unsigned long timestamp = data->timestamp;
3386
3387         if (task->tk_status < 0) {
3388                 /* Unless we're shutting down, schedule state recovery! */
3389                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3390                         return;
3391                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3392                         nfs4_schedule_lease_recovery(clp);
3393                         return;
3394                 }
3395                 nfs4_schedule_path_down_recovery(clp);
3396         }
3397         do_renew_lease(clp, timestamp);
3398 }
3399
3400 static const struct rpc_call_ops nfs4_renew_ops = {
3401         .rpc_call_done = nfs4_renew_done,
3402         .rpc_release = nfs4_renew_release,
3403 };
3404
3405 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3406 {
3407         struct rpc_message msg = {
3408                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3409                 .rpc_argp       = clp,
3410                 .rpc_cred       = cred,
3411         };
3412         struct nfs4_renewdata *data;
3413
3414         if (renew_flags == 0)
3415                 return 0;
3416         if (!atomic_inc_not_zero(&clp->cl_count))
3417                 return -EIO;
3418         data = kmalloc(sizeof(*data), GFP_NOFS);
3419         if (data == NULL)
3420                 return -ENOMEM;
3421         data->client = clp;
3422         data->timestamp = jiffies;
3423         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3424                         &nfs4_renew_ops, data);
3425 }
3426
3427 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3428 {
3429         struct rpc_message msg = {
3430                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3431                 .rpc_argp       = clp,
3432                 .rpc_cred       = cred,
3433         };
3434         unsigned long now = jiffies;
3435         int status;
3436
3437         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3438         if (status < 0)
3439                 return status;
3440         do_renew_lease(clp, now);
3441         return 0;
3442 }
3443
3444 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3445 {
3446         return (server->caps & NFS_CAP_ACLS)
3447                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3448                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3449 }
3450
3451 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3452  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3453  * the stack.
3454  */
3455 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3456
3457 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3458                 struct page **pages, unsigned int *pgbase)
3459 {
3460         struct page *newpage, **spages;
3461         int rc = 0;
3462         size_t len;
3463         spages = pages;
3464
3465         do {
3466                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3467                 newpage = alloc_page(GFP_KERNEL);
3468
3469                 if (newpage == NULL)
3470                         goto unwind;
3471                 memcpy(page_address(newpage), buf, len);
3472                 buf += len;
3473                 buflen -= len;
3474                 *pages++ = newpage;
3475                 rc++;
3476         } while (buflen != 0);
3477
3478         return rc;
3479
3480 unwind:
3481         for(; rc > 0; rc--)
3482                 __free_page(spages[rc-1]);
3483         return -ENOMEM;
3484 }
3485
3486 struct nfs4_cached_acl {
3487         int cached;
3488         size_t len;
3489         char data[0];
3490 };
3491
3492 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3493 {
3494         struct nfs_inode *nfsi = NFS_I(inode);
3495
3496         spin_lock(&inode->i_lock);
3497         kfree(nfsi->nfs4_acl);
3498         nfsi->nfs4_acl = acl;
3499         spin_unlock(&inode->i_lock);
3500 }
3501
3502 static void nfs4_zap_acl_attr(struct inode *inode)
3503 {
3504         nfs4_set_cached_acl(inode, NULL);
3505 }
3506
3507 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3508 {
3509         struct nfs_inode *nfsi = NFS_I(inode);
3510         struct nfs4_cached_acl *acl;
3511         int ret = -ENOENT;
3512
3513         spin_lock(&inode->i_lock);
3514         acl = nfsi->nfs4_acl;
3515         if (acl == NULL)
3516                 goto out;
3517         if (buf == NULL) /* user is just asking for length */
3518                 goto out_len;
3519         if (acl->cached == 0)
3520                 goto out;
3521         ret = -ERANGE; /* see getxattr(2) man page */
3522         if (acl->len > buflen)
3523                 goto out;
3524         memcpy(buf, acl->data, acl->len);
3525 out_len:
3526         ret = acl->len;
3527 out:
3528         spin_unlock(&inode->i_lock);
3529         return ret;
3530 }
3531
3532 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3533 {
3534         struct nfs4_cached_acl *acl;
3535
3536         if (pages && acl_len <= PAGE_SIZE) {
3537                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3538                 if (acl == NULL)
3539                         goto out;
3540                 acl->cached = 1;
3541                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3542         } else {
3543                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3544                 if (acl == NULL)
3545                         goto out;
3546                 acl->cached = 0;
3547         }
3548         acl->len = acl_len;
3549 out:
3550         nfs4_set_cached_acl(inode, acl);
3551 }
3552
3553 /*
3554  * The getxattr API returns the required buffer length when called with a
3555  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3556  * the required buf.  On a NULL buf, we send a page of data to the server
3557  * guessing that the ACL request can be serviced by a page. If so, we cache
3558  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3559  * the cache. If not so, we throw away the page, and cache the required
3560  * length. The next getxattr call will then produce another round trip to
3561  * the server, this time with the input buf of the required size.
3562  */
3563 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3564 {
3565         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3566         struct nfs_getaclargs args = {
3567                 .fh = NFS_FH(inode),
3568                 .acl_pages = pages,
3569                 .acl_len = buflen,
3570         };
3571         struct nfs_getaclres res = {
3572                 .acl_len = buflen,
3573         };
3574         struct rpc_message msg = {
3575                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3576                 .rpc_argp = &args,
3577                 .rpc_resp = &res,
3578         };
3579         int ret = -ENOMEM, npages, i, acl_len = 0;
3580
3581         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3582         /* As long as we're doing a round trip to the server anyway,
3583          * let's be prepared for a page of acl data. */
3584         if (npages == 0)
3585                 npages = 1;
3586
3587         /* Add an extra page to handle the bitmap returned */
3588         npages++;
3589
3590         for (i = 0; i < npages; i++) {
3591                 pages[i] = alloc_page(GFP_KERNEL);
3592                 if (!pages[i])
3593                         goto out_free;
3594         }
3595
3596         /* for decoding across pages */
3597         res.acl_scratch = alloc_page(GFP_KERNEL);
3598         if (!res.acl_scratch)
3599                 goto out_free;
3600
3601         args.acl_len = npages * PAGE_SIZE;
3602         args.acl_pgbase = 0;
3603
3604         /* Let decode_getfacl know not to fail if the ACL data is larger than
3605          * the page we send as a guess */
3606         if (buf == NULL)
3607                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3608
3609         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3610                 __func__, buf, buflen, npages, args.acl_len);
3611         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3612                              &msg, &args.seq_args, &res.seq_res, 0);
3613         if (ret)
3614                 goto out_free;
3615
3616         acl_len = res.acl_len - res.acl_data_offset;
3617         if (acl_len > args.acl_len)
3618                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3619         else
3620                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3621                                       acl_len);
3622         if (buf) {
3623                 ret = -ERANGE;
3624                 if (acl_len > buflen)
3625                         goto out_free;
3626                 _copy_from_pages(buf, pages, res.acl_data_offset,
3627                                 acl_len);
3628         }
3629         ret = acl_len;
3630 out_free:
3631         for (i = 0; i < npages; i++)
3632                 if (pages[i])
3633                         __free_page(pages[i]);
3634         if (res.acl_scratch)
3635                 __free_page(res.acl_scratch);
3636         return ret;
3637 }
3638
3639 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3640 {
3641         struct nfs4_exception exception = { };
3642         ssize_t ret;
3643         do {
3644                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3645                 if (ret >= 0)
3646                         break;
3647                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3648         } while (exception.retry);
3649         return ret;
3650 }
3651
3652 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3653 {
3654         struct nfs_server *server = NFS_SERVER(inode);
3655         int ret;
3656
3657         if (!nfs4_server_supports_acls(server))
3658                 return -EOPNOTSUPP;
3659         ret = nfs_revalidate_inode(server, inode);
3660         if (ret < 0)
3661                 return ret;
3662         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3663                 nfs_zap_acl_cache(inode);
3664         ret = nfs4_read_cached_acl(inode, buf, buflen);
3665         if (ret != -ENOENT)
3666                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3667                  * but no cached acl data, just the acl length */
3668                 return ret;
3669         return nfs4_get_acl_uncached(inode, buf, buflen);
3670 }
3671
3672 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3673 {
3674         struct nfs_server *server = NFS_SERVER(inode);
3675         struct page *pages[NFS4ACL_MAXPAGES];
3676         struct nfs_setaclargs arg = {
3677                 .fh             = NFS_FH(inode),
3678                 .acl_pages      = pages,
3679                 .acl_len        = buflen,
3680         };
3681         struct nfs_setaclres res;
3682         struct rpc_message msg = {
3683                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3684                 .rpc_argp       = &arg,
3685                 .rpc_resp       = &res,
3686         };
3687         int ret, i;
3688
3689         if (!nfs4_server_supports_acls(server))
3690                 return -EOPNOTSUPP;
3691         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3692         if (i < 0)
3693                 return i;
3694         nfs_inode_return_delegation(inode);
3695         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3696
3697         /*
3698          * Free each page after tx, so the only ref left is
3699          * held by the network stack
3700          */
3701         for (; i > 0; i--)
3702                 put_page(pages[i-1]);
3703
3704         /*
3705          * Acl update can result in inode attribute update.
3706          * so mark the attribute cache invalid.
3707          */
3708         spin_lock(&inode->i_lock);
3709         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3710         spin_unlock(&inode->i_lock);
3711         nfs_access_zap_cache(inode);
3712         nfs_zap_acl_cache(inode);
3713         return ret;
3714 }
3715
3716 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3717 {
3718         struct nfs4_exception exception = { };
3719         int err;
3720         do {
3721                 err = nfs4_handle_exception(NFS_SERVER(inode),
3722                                 __nfs4_proc_set_acl(inode, buf, buflen),
3723                                 &exception);
3724         } while (exception.retry);
3725         return err;
3726 }
3727
3728 static int
3729 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3730 {
3731         struct nfs_client *clp = server->nfs_client;
3732
3733         if (task->tk_status >= 0)
3734                 return 0;
3735         switch(task->tk_status) {
3736                 case -NFS4ERR_DELEG_REVOKED:
3737                 case -NFS4ERR_ADMIN_REVOKED:
3738                 case -NFS4ERR_BAD_STATEID:
3739                         if (state != NULL)
3740                                 nfs_remove_bad_delegation(state->inode);
3741                 case -NFS4ERR_OPENMODE:
3742                         if (state == NULL)
3743                                 break;
3744                         nfs4_schedule_stateid_recovery(server, state);
3745                         goto wait_on_recovery;
3746                 case -NFS4ERR_EXPIRED:
3747                         if (state != NULL)
3748                                 nfs4_schedule_stateid_recovery(server, state);
3749                 case -NFS4ERR_STALE_STATEID:
3750                 case -NFS4ERR_STALE_CLIENTID:
3751                         nfs4_schedule_lease_recovery(clp);
3752                         goto wait_on_recovery;
3753 #if defined(CONFIG_NFS_V4_1)
3754                 case -NFS4ERR_BADSESSION:
3755                 case -NFS4ERR_BADSLOT:
3756                 case -NFS4ERR_BAD_HIGH_SLOT:
3757                 case -NFS4ERR_DEADSESSION:
3758                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3759                 case -NFS4ERR_SEQ_FALSE_RETRY:
3760                 case -NFS4ERR_SEQ_MISORDERED:
3761                         dprintk("%s ERROR %d, Reset session\n", __func__,
3762                                 task->tk_status);
3763                         nfs4_schedule_session_recovery(clp->cl_session);
3764                         task->tk_status = 0;
3765                         return -EAGAIN;
3766 #endif /* CONFIG_NFS_V4_1 */
3767                 case -NFS4ERR_DELAY:
3768                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3769                 case -NFS4ERR_GRACE:
3770                 case -EKEYEXPIRED:
3771                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3772                         task->tk_status = 0;
3773                         return -EAGAIN;
3774                 case -NFS4ERR_RETRY_UNCACHED_REP:
3775                 case -NFS4ERR_OLD_STATEID:
3776                         task->tk_status = 0;
3777                         return -EAGAIN;
3778         }
3779         task->tk_status = nfs4_map_errors(task->tk_status);
3780         return 0;
3781 wait_on_recovery:
3782         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3783         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3784                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3785         task->tk_status = 0;
3786         return -EAGAIN;
3787 }
3788
3789 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3790                 unsigned short port, struct rpc_cred *cred,
3791                 struct nfs4_setclientid_res *res)
3792 {
3793         nfs4_verifier sc_verifier;
3794         struct nfs4_setclientid setclientid = {
3795                 .sc_verifier = &sc_verifier,
3796                 .sc_prog = program,
3797                 .sc_cb_ident = clp->cl_cb_ident,
3798         };
3799         struct rpc_message msg = {
3800                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3801                 .rpc_argp = &setclientid,
3802                 .rpc_resp = res,
3803                 .rpc_cred = cred,
3804         };
3805         __be32 *p;
3806         int loop = 0;
3807         int status;
3808
3809         p = (__be32*)sc_verifier.data;
3810         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3811         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3812
3813         for(;;) {
3814                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3815                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3816                                 clp->cl_ipaddr,
3817                                 rpc_peeraddr2str(clp->cl_rpcclient,
3818                                                         RPC_DISPLAY_ADDR),
3819                                 rpc_peeraddr2str(clp->cl_rpcclient,
3820                                                         RPC_DISPLAY_PROTO),
3821                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3822                                 clp->cl_id_uniquifier);
3823                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3824                                 sizeof(setclientid.sc_netid),
3825                                 rpc_peeraddr2str(clp->cl_rpcclient,
3826                                                         RPC_DISPLAY_NETID));
3827                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3828                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3829                                 clp->cl_ipaddr, port >> 8, port & 255);
3830
3831                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3832                 if (status != -NFS4ERR_CLID_INUSE)
3833                         break;
3834                 if (loop != 0) {
3835                         ++clp->cl_id_uniquifier;
3836                         break;
3837                 }
3838                 ++loop;
3839                 ssleep(clp->cl_lease_time / HZ + 1);
3840         }
3841         return status;
3842 }
3843
3844 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3845                 struct nfs4_setclientid_res *arg,
3846                 struct rpc_cred *cred)
3847 {
3848         struct nfs_fsinfo fsinfo;
3849         struct rpc_message msg = {
3850                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3851                 .rpc_argp = arg,
3852                 .rpc_resp = &fsinfo,
3853                 .rpc_cred = cred,
3854         };
3855         unsigned long now;
3856         int status;
3857
3858         now = jiffies;
3859         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3860         if (status == 0) {
3861                 spin_lock(&clp->cl_lock);
3862                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3863                 clp->cl_last_renewal = now;
3864                 spin_unlock(&clp->cl_lock);
3865         }
3866         return status;
3867 }
3868
3869 struct nfs4_delegreturndata {
3870         struct nfs4_delegreturnargs args;
3871         struct nfs4_delegreturnres res;
3872         struct nfs_fh fh;
3873         nfs4_stateid stateid;
3874         unsigned long timestamp;
3875         struct nfs_fattr fattr;
3876         int rpc_status;
3877 };
3878
3879 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3880 {
3881         struct nfs4_delegreturndata *data = calldata;
3882
3883         if (!nfs4_sequence_done(task, &data->res.seq_res))
3884                 return;
3885
3886         switch (task->tk_status) {
3887         case -NFS4ERR_STALE_STATEID:
3888         case -NFS4ERR_EXPIRED:
3889         case 0:
3890                 renew_lease(data->res.server, data->timestamp);
3891                 break;
3892         default:
3893                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3894                                 -EAGAIN) {
3895                         rpc_restart_call_prepare(task);
3896                         return;
3897                 }
3898         }
3899         data->rpc_status = task->tk_status;
3900 }
3901
3902 static void nfs4_delegreturn_release(void *calldata)
3903 {
3904         kfree(calldata);
3905 }
3906
3907 #if defined(CONFIG_NFS_V4_1)
3908 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3909 {
3910         struct nfs4_delegreturndata *d_data;
3911
3912         d_data = (struct nfs4_delegreturndata *)data;
3913
3914         if (nfs4_setup_sequence(d_data->res.server,
3915                                 &d_data->args.seq_args,
3916                                 &d_data->res.seq_res, 1, task))
3917                 return;
3918         rpc_call_start(task);
3919 }
3920 #endif /* CONFIG_NFS_V4_1 */
3921
3922 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3923 #if defined(CONFIG_NFS_V4_1)
3924         .rpc_call_prepare = nfs4_delegreturn_prepare,
3925 #endif /* CONFIG_NFS_V4_1 */
3926         .rpc_call_done = nfs4_delegreturn_done,
3927         .rpc_release = nfs4_delegreturn_release,
3928 };
3929
3930 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3931 {
3932         struct nfs4_delegreturndata *data;
3933         struct nfs_server *server = NFS_SERVER(inode);
3934         struct rpc_task *task;
3935         struct rpc_message msg = {
3936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3937                 .rpc_cred = cred,
3938         };
3939         struct rpc_task_setup task_setup_data = {
3940                 .rpc_client = server->client,
3941                 .rpc_message = &msg,
3942                 .callback_ops = &nfs4_delegreturn_ops,
3943                 .flags = RPC_TASK_ASYNC,
3944         };
3945         int status = 0;
3946
3947         data = kzalloc(sizeof(*data), GFP_NOFS);
3948         if (data == NULL)
3949                 return -ENOMEM;
3950         data->args.fhandle = &data->fh;
3951         data->args.stateid = &data->stateid;
3952         data->args.bitmask = server->attr_bitmask;
3953         nfs_copy_fh(&data->fh, NFS_FH(inode));
3954         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3955         data->res.fattr = &data->fattr;
3956         data->res.server = server;
3957         nfs_fattr_init(data->res.fattr);
3958         data->timestamp = jiffies;
3959         data->rpc_status = 0;
3960
3961         task_setup_data.callback_data = data;
3962         msg.rpc_argp = &data->args;
3963         msg.rpc_resp = &data->res;
3964         task = rpc_run_task(&task_setup_data);
3965         if (IS_ERR(task))
3966                 return PTR_ERR(task);
3967         if (!issync)
3968                 goto out;
3969         status = nfs4_wait_for_completion_rpc_task(task);
3970         if (status != 0)
3971                 goto out;
3972         status = data->rpc_status;
3973         if (status != 0)
3974                 goto out;
3975         nfs_refresh_inode(inode, &data->fattr);
3976 out:
3977         rpc_put_task(task);
3978         return status;
3979 }
3980
3981 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3982 {
3983         struct nfs_server *server = NFS_SERVER(inode);
3984         struct nfs4_exception exception = { };
3985         int err;
3986         do {
3987                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3988                 switch (err) {
3989                         case -NFS4ERR_STALE_STATEID:
3990                         case -NFS4ERR_EXPIRED:
3991                         case 0:
3992                                 return 0;
3993                 }
3994                 err = nfs4_handle_exception(server, err, &exception);
3995         } while (exception.retry);
3996         return err;
3997 }
3998
3999 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4000 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4001
4002 /*
4003  * sleep, with exponential backoff, and retry the LOCK operation.
4004  */
4005 static unsigned long
4006 nfs4_set_lock_task_retry(unsigned long timeout)
4007 {
4008         schedule_timeout_killable(timeout);
4009         timeout <<= 1;
4010         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4011                 return NFS4_LOCK_MAXTIMEOUT;
4012         return timeout;
4013 }
4014
4015 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4016 {
4017         struct inode *inode = state->inode;
4018         struct nfs_server *server = NFS_SERVER(inode);
4019         struct nfs_client *clp = server->nfs_client;
4020         struct nfs_lockt_args arg = {
4021                 .fh = NFS_FH(inode),
4022                 .fl = request,
4023         };
4024         struct nfs_lockt_res res = {
4025                 .denied = request,
4026         };
4027         struct rpc_message msg = {
4028                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4029                 .rpc_argp       = &arg,
4030                 .rpc_resp       = &res,
4031                 .rpc_cred       = state->owner->so_cred,
4032         };
4033         struct nfs4_lock_state *lsp;
4034         int status;
4035
4036         arg.lock_owner.clientid = clp->cl_clientid;
4037         status = nfs4_set_lock_state(state, request);
4038         if (status != 0)
4039                 goto out;
4040         lsp = request->fl_u.nfs4_fl.owner;
4041         arg.lock_owner.id = lsp->ls_id.id;
4042         arg.lock_owner.s_dev = server->s_dev;
4043         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4044         switch (status) {
4045                 case 0:
4046                         request->fl_type = F_UNLCK;
4047                         break;
4048                 case -NFS4ERR_DENIED:
4049                         status = 0;
4050         }
4051         request->fl_ops->fl_release_private(request);
4052 out:
4053         return status;
4054 }
4055
4056 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4057 {
4058         struct nfs4_exception exception = { };
4059         int err;
4060
4061         do {
4062                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4063                                 _nfs4_proc_getlk(state, cmd, request),
4064                                 &exception);
4065         } while (exception.retry);
4066         return err;
4067 }
4068
4069 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4070 {
4071         int res = 0;
4072         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4073                 case FL_POSIX:
4074                         res = posix_lock_file_wait(file, fl);
4075                         break;
4076                 case FL_FLOCK:
4077                         res = flock_lock_file_wait(file, fl);
4078                         break;
4079                 default:
4080                         BUG();
4081         }
4082         return res;
4083 }
4084
4085 struct nfs4_unlockdata {
4086         struct nfs_locku_args arg;
4087         struct nfs_locku_res res;
4088         struct nfs4_lock_state *lsp;
4089         struct nfs_open_context *ctx;
4090         struct file_lock fl;
4091         const struct nfs_server *server;
4092         unsigned long timestamp;
4093 };
4094
4095 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4096                 struct nfs_open_context *ctx,
4097                 struct nfs4_lock_state *lsp,
4098                 struct nfs_seqid *seqid)
4099 {
4100         struct nfs4_unlockdata *p;
4101         struct inode *inode = lsp->ls_state->inode;
4102
4103         p = kzalloc(sizeof(*p), GFP_NOFS);
4104         if (p == NULL)
4105                 return NULL;
4106         p->arg.fh = NFS_FH(inode);
4107         p->arg.fl = &p->fl;
4108         p->arg.seqid = seqid;
4109         p->res.seqid = seqid;
4110         p->arg.stateid = &lsp->ls_stateid;
4111         p->lsp = lsp;
4112         atomic_inc(&lsp->ls_count);
4113         /* Ensure we don't close file until we're done freeing locks! */
4114         p->ctx = get_nfs_open_context(ctx);
4115         memcpy(&p->fl, fl, sizeof(p->fl));
4116         p->server = NFS_SERVER(inode);
4117         return p;
4118 }
4119
4120 static void nfs4_locku_release_calldata(void *data)
4121 {
4122         struct nfs4_unlockdata *calldata = data;
4123         nfs_free_seqid(calldata->arg.seqid);
4124         nfs4_put_lock_state(calldata->lsp);
4125         put_nfs_open_context(calldata->ctx);
4126         kfree(calldata);
4127 }
4128
4129 static void nfs4_locku_done(struct rpc_task *task, void *data)
4130 {
4131         struct nfs4_unlockdata *calldata = data;
4132
4133         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4134                 return;
4135         switch (task->tk_status) {
4136                 case 0:
4137                         memcpy(calldata->lsp->ls_stateid.data,
4138                                         calldata->res.stateid.data,
4139                                         sizeof(calldata->lsp->ls_stateid.data));
4140                         renew_lease(calldata->server, calldata->timestamp);
4141                         break;
4142                 case -NFS4ERR_BAD_STATEID:
4143                 case -NFS4ERR_OLD_STATEID:
4144                 case -NFS4ERR_STALE_STATEID:
4145                 case -NFS4ERR_EXPIRED:
4146                         break;
4147                 default:
4148                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4149                                 rpc_restart_call_prepare(task);
4150         }
4151 }
4152
4153 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4154 {
4155         struct nfs4_unlockdata *calldata = data;
4156
4157         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4158                 return;
4159         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4160                 /* Note: exit _without_ running nfs4_locku_done */
4161                 task->tk_action = NULL;
4162                 return;
4163         }
4164         calldata->timestamp = jiffies;
4165         if (nfs4_setup_sequence(calldata->server,
4166                                 &calldata->arg.seq_args,
4167                                 &calldata->res.seq_res, 1, task))
4168                 return;
4169         rpc_call_start(task);
4170 }
4171
4172 static const struct rpc_call_ops nfs4_locku_ops = {
4173         .rpc_call_prepare = nfs4_locku_prepare,
4174         .rpc_call_done = nfs4_locku_done,
4175         .rpc_release = nfs4_locku_release_calldata,
4176 };
4177
4178 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4179                 struct nfs_open_context *ctx,
4180                 struct nfs4_lock_state *lsp,
4181                 struct nfs_seqid *seqid)
4182 {
4183         struct nfs4_unlockdata *data;
4184         struct rpc_message msg = {
4185                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4186                 .rpc_cred = ctx->cred,
4187         };
4188         struct rpc_task_setup task_setup_data = {
4189                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4190                 .rpc_message = &msg,
4191                 .callback_ops = &nfs4_locku_ops,
4192                 .workqueue = nfsiod_workqueue,
4193                 .flags = RPC_TASK_ASYNC,
4194         };
4195
4196         /* Ensure this is an unlock - when canceling a lock, the
4197          * canceled lock is passed in, and it won't be an unlock.
4198          */
4199         fl->fl_type = F_UNLCK;
4200
4201         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4202         if (data == NULL) {
4203                 nfs_free_seqid(seqid);
4204                 return ERR_PTR(-ENOMEM);
4205         }
4206
4207         msg.rpc_argp = &data->arg;
4208         msg.rpc_resp = &data->res;
4209         task_setup_data.callback_data = data;
4210         return rpc_run_task(&task_setup_data);
4211 }
4212
4213 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4214 {
4215         struct nfs_inode *nfsi = NFS_I(state->inode);
4216         struct nfs_seqid *seqid;
4217         struct nfs4_lock_state *lsp;
4218         struct rpc_task *task;
4219         int status = 0;
4220         unsigned char fl_flags = request->fl_flags;
4221
4222         status = nfs4_set_lock_state(state, request);
4223         /* Unlock _before_ we do the RPC call */
4224         request->fl_flags |= FL_EXISTS;
4225         down_read(&nfsi->rwsem);
4226         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4227                 up_read(&nfsi->rwsem);
4228                 goto out;
4229         }
4230         up_read(&nfsi->rwsem);
4231         if (status != 0)
4232                 goto out;
4233         /* Is this a delegated lock? */
4234         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4235                 goto out;
4236         lsp = request->fl_u.nfs4_fl.owner;
4237         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4238         status = -ENOMEM;
4239         if (seqid == NULL)
4240                 goto out;
4241         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4242         status = PTR_ERR(task);
4243         if (IS_ERR(task))
4244                 goto out;
4245         status = nfs4_wait_for_completion_rpc_task(task);
4246         rpc_put_task(task);
4247 out:
4248         request->fl_flags = fl_flags;
4249         return status;
4250 }
4251
4252 struct nfs4_lockdata {
4253         struct nfs_lock_args arg;
4254         struct nfs_lock_res res;
4255         struct nfs4_lock_state *lsp;
4256         struct nfs_open_context *ctx;
4257         struct file_lock fl;
4258         unsigned long timestamp;
4259         int rpc_status;
4260         int cancelled;
4261         struct nfs_server *server;
4262 };
4263
4264 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4265                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4266                 gfp_t gfp_mask)
4267 {
4268         struct nfs4_lockdata *p;
4269         struct inode *inode = lsp->ls_state->inode;
4270         struct nfs_server *server = NFS_SERVER(inode);
4271
4272         p = kzalloc(sizeof(*p), gfp_mask);
4273         if (p == NULL)
4274                 return NULL;
4275
4276         p->arg.fh = NFS_FH(inode);
4277         p->arg.fl = &p->fl;
4278         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4279         if (p->arg.open_seqid == NULL)
4280                 goto out_free;
4281         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4282         if (p->arg.lock_seqid == NULL)
4283                 goto out_free_seqid;
4284         p->arg.lock_stateid = &lsp->ls_stateid;
4285         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4286         p->arg.lock_owner.id = lsp->ls_id.id;
4287         p->arg.lock_owner.s_dev = server->s_dev;
4288         p->res.lock_seqid = p->arg.lock_seqid;
4289         p->lsp = lsp;
4290         p->server = server;
4291         atomic_inc(&lsp->ls_count);
4292         p->ctx = get_nfs_open_context(ctx);
4293         memcpy(&p->fl, fl, sizeof(p->fl));
4294         return p;
4295 out_free_seqid:
4296         nfs_free_seqid(p->arg.open_seqid);
4297 out_free:
4298         kfree(p);
4299         return NULL;
4300 }
4301
4302 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4303 {
4304         struct nfs4_lockdata *data = calldata;
4305         struct nfs4_state *state = data->lsp->ls_state;
4306
4307         dprintk("%s: begin!\n", __func__);
4308         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4309                 return;
4310         /* Do we need to do an open_to_lock_owner? */
4311         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4312                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4313                         return;
4314                 data->arg.open_stateid = &state->stateid;
4315                 data->arg.new_lock_owner = 1;
4316                 data->res.open_seqid = data->arg.open_seqid;
4317         } else
4318                 data->arg.new_lock_owner = 0;
4319         data->timestamp = jiffies;
4320         if (nfs4_setup_sequence(data->server,
4321                                 &data->arg.seq_args,
4322                                 &data->res.seq_res, 1, task))
4323                 return;
4324         rpc_call_start(task);
4325         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4326 }
4327
4328 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4329 {
4330         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4331         nfs4_lock_prepare(task, calldata);
4332 }
4333
4334 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4335 {
4336         struct nfs4_lockdata *data = calldata;
4337
4338         dprintk("%s: begin!\n", __func__);
4339
4340         if (!nfs4_sequence_done(task, &data->res.seq_res))
4341                 return;
4342
4343         data->rpc_status = task->tk_status;
4344         if (data->arg.new_lock_owner != 0) {
4345                 if (data->rpc_status == 0)
4346                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4347                 else
4348                         goto out;
4349         }
4350         if (data->rpc_status == 0) {
4351                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4352                                         sizeof(data->lsp->ls_stateid.data));
4353                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4354                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4355         }
4356 out:
4357         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4358 }
4359
4360 static void nfs4_lock_release(void *calldata)
4361 {
4362         struct nfs4_lockdata *data = calldata;
4363
4364         dprintk("%s: begin!\n", __func__);
4365         nfs_free_seqid(data->arg.open_seqid);
4366         if (data->cancelled != 0) {
4367                 struct rpc_task *task;
4368                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4369                                 data->arg.lock_seqid);
4370                 if (!IS_ERR(task))
4371                         rpc_put_task_async(task);
4372                 dprintk("%s: cancelling lock!\n", __func__);
4373         } else
4374                 nfs_free_seqid(data->arg.lock_seqid);
4375         nfs4_put_lock_state(data->lsp);
4376         put_nfs_open_context(data->ctx);
4377         kfree(data);
4378         dprintk("%s: done!\n", __func__);
4379 }
4380
4381 static const struct rpc_call_ops nfs4_lock_ops = {
4382         .rpc_call_prepare = nfs4_lock_prepare,
4383         .rpc_call_done = nfs4_lock_done,
4384         .rpc_release = nfs4_lock_release,
4385 };
4386
4387 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4388         .rpc_call_prepare = nfs4_recover_lock_prepare,
4389         .rpc_call_done = nfs4_lock_done,
4390         .rpc_release = nfs4_lock_release,
4391 };
4392
4393 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4394 {
4395         switch (error) {
4396         case -NFS4ERR_ADMIN_REVOKED:
4397         case -NFS4ERR_BAD_STATEID:
4398                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4399                 if (new_lock_owner != 0 ||
4400                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4401                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4402                 break;
4403         case -NFS4ERR_STALE_STATEID:
4404                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4405         case -NFS4ERR_EXPIRED:
4406                 nfs4_schedule_lease_recovery(server->nfs_client);
4407         };
4408 }
4409
4410 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4411 {
4412         struct nfs4_lockdata *data;
4413         struct rpc_task *task;
4414         struct rpc_message msg = {
4415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4416                 .rpc_cred = state->owner->so_cred,
4417         };
4418         struct rpc_task_setup task_setup_data = {
4419                 .rpc_client = NFS_CLIENT(state->inode),
4420                 .rpc_message = &msg,
4421                 .callback_ops = &nfs4_lock_ops,
4422                 .workqueue = nfsiod_workqueue,
4423                 .flags = RPC_TASK_ASYNC,
4424         };
4425         int ret;
4426
4427         dprintk("%s: begin!\n", __func__);
4428         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4429                         fl->fl_u.nfs4_fl.owner,
4430                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4431         if (data == NULL)
4432                 return -ENOMEM;
4433         if (IS_SETLKW(cmd))
4434                 data->arg.block = 1;
4435         if (recovery_type > NFS_LOCK_NEW) {
4436                 if (recovery_type == NFS_LOCK_RECLAIM)
4437                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4438                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4439         }
4440         msg.rpc_argp = &data->arg;
4441         msg.rpc_resp = &data->res;
4442         task_setup_data.callback_data = data;
4443         task = rpc_run_task(&task_setup_data);
4444         if (IS_ERR(task))
4445                 return PTR_ERR(task);
4446         ret = nfs4_wait_for_completion_rpc_task(task);
4447         if (ret == 0) {
4448                 ret = data->rpc_status;
4449                 if (ret)
4450                         nfs4_handle_setlk_error(data->server, data->lsp,
4451                                         data->arg.new_lock_owner, ret);
4452         } else
4453                 data->cancelled = 1;
4454         rpc_put_task(task);
4455         dprintk("%s: done, ret = %d!\n", __func__, ret);
4456         return ret;
4457 }
4458
4459 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4460 {
4461         struct nfs_server *server = NFS_SERVER(state->inode);
4462         struct nfs4_exception exception = {
4463                 .inode = state->inode,
4464         };
4465         int err;
4466
4467         do {
4468                 /* Cache the lock if possible... */
4469                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4470                         return 0;
4471                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4472                 if (err != -NFS4ERR_DELAY)
4473                         break;
4474                 nfs4_handle_exception(server, err, &exception);
4475         } while (exception.retry);
4476         return err;
4477 }
4478
4479 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4480 {
4481         struct nfs_server *server = NFS_SERVER(state->inode);
4482         struct nfs4_exception exception = {
4483                 .inode = state->inode,
4484         };
4485         int err;
4486
4487         err = nfs4_set_lock_state(state, request);
4488         if (err != 0)
4489                 return err;
4490         do {
4491                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4492                         return 0;
4493                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4494                 switch (err) {
4495                 default:
4496                         goto out;
4497                 case -NFS4ERR_GRACE:
4498                 case -NFS4ERR_DELAY:
4499                         nfs4_handle_exception(server, err, &exception);
4500                         err = 0;
4501                 }
4502         } while (exception.retry);
4503 out:
4504         return err;
4505 }
4506
4507 #if defined(CONFIG_NFS_V4_1)
4508 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4509 {
4510         int status;
4511         struct nfs_server *server = NFS_SERVER(state->inode);
4512
4513         status = nfs41_test_stateid(server, state);
4514         if (status == NFS_OK)
4515                 return 0;
4516         nfs41_free_stateid(server, state);
4517         return nfs4_lock_expired(state, request);
4518 }
4519 #endif
4520
4521 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4522 {
4523         struct nfs_inode *nfsi = NFS_I(state->inode);
4524         unsigned char fl_flags = request->fl_flags;
4525         int status = -ENOLCK;
4526
4527         if ((fl_flags & FL_POSIX) &&
4528                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4529                 goto out;
4530         /* Is this a delegated open? */
4531         status = nfs4_set_lock_state(state, request);
4532         if (status != 0)
4533                 goto out;
4534         request->fl_flags |= FL_ACCESS;
4535         status = do_vfs_lock(request->fl_file, request);
4536         if (status < 0)
4537                 goto out;
4538         down_read(&nfsi->rwsem);
4539         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4540                 /* Yes: cache locks! */
4541                 /* ...but avoid races with delegation recall... */
4542                 request->fl_flags = fl_flags & ~FL_SLEEP;
4543                 status = do_vfs_lock(request->fl_file, request);
4544                 goto out_unlock;
4545         }
4546         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4547         if (status != 0)
4548                 goto out_unlock;
4549         /* Note: we always want to sleep here! */
4550         request->fl_flags = fl_flags | FL_SLEEP;
4551         if (do_vfs_lock(request->fl_file, request) < 0)
4552                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4553 out_unlock:
4554         up_read(&nfsi->rwsem);
4555 out:
4556         request->fl_flags = fl_flags;
4557         return status;
4558 }
4559
4560 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4561 {
4562         struct nfs4_exception exception = {
4563                 .state = state,
4564                 .inode = state->inode,
4565         };
4566         int err;
4567
4568         do {
4569                 err = _nfs4_proc_setlk(state, cmd, request);
4570                 if (err == -NFS4ERR_DENIED)
4571                         err = -EAGAIN;
4572                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4573                                 err, &exception);
4574         } while (exception.retry);
4575         return err;
4576 }
4577
4578 static int
4579 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4580 {
4581         struct nfs_open_context *ctx;
4582         struct nfs4_state *state;
4583         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4584         int status;
4585
4586         /* verify open state */
4587         ctx = nfs_file_open_context(filp);
4588         state = ctx->state;
4589
4590         if (request->fl_start < 0 || request->fl_end < 0)
4591                 return -EINVAL;
4592
4593         if (IS_GETLK(cmd)) {
4594                 if (state != NULL)
4595                         return nfs4_proc_getlk(state, F_GETLK, request);
4596                 return 0;
4597         }
4598
4599         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4600                 return -EINVAL;
4601
4602         if (request->fl_type == F_UNLCK) {
4603                 if (state != NULL)
4604                         return nfs4_proc_unlck(state, cmd, request);
4605                 return 0;
4606         }
4607
4608         if (state == NULL)
4609                 return -ENOLCK;
4610         /*
4611          * Don't rely on the VFS having checked the file open mode,
4612          * since it won't do this for flock() locks.
4613          */
4614         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4615         case F_RDLCK:
4616                 if (!(filp->f_mode & FMODE_READ))
4617                         return -EBADF;
4618                 break;
4619         case F_WRLCK:
4620                 if (!(filp->f_mode & FMODE_WRITE))
4621                         return -EBADF;
4622         }
4623
4624         do {
4625                 status = nfs4_proc_setlk(state, cmd, request);
4626                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4627                         break;
4628                 timeout = nfs4_set_lock_task_retry(timeout);
4629                 status = -ERESTARTSYS;
4630                 if (signalled())
4631                         break;
4632         } while(status < 0);
4633         return status;
4634 }
4635
4636 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4637 {
4638         struct nfs_server *server = NFS_SERVER(state->inode);
4639         struct nfs4_exception exception = { };
4640         int err;
4641
4642         err = nfs4_set_lock_state(state, fl);
4643         if (err != 0)
4644                 goto out;
4645         do {
4646                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4647                 switch (err) {
4648                         default:
4649                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4650                                                 __func__, err);
4651                         case 0:
4652                         case -ESTALE:
4653                                 goto out;
4654                         case -NFS4ERR_EXPIRED:
4655                                 nfs4_schedule_stateid_recovery(server, state);
4656                         case -NFS4ERR_STALE_CLIENTID:
4657                         case -NFS4ERR_STALE_STATEID:
4658                                 nfs4_schedule_lease_recovery(server->nfs_client);
4659                                 goto out;
4660                         case -NFS4ERR_BADSESSION:
4661                         case -NFS4ERR_BADSLOT:
4662                         case -NFS4ERR_BAD_HIGH_SLOT:
4663                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4664                         case -NFS4ERR_DEADSESSION:
4665                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4666                                 goto out;
4667                         case -ERESTARTSYS:
4668                                 /*
4669                                  * The show must go on: exit, but mark the
4670                                  * stateid as needing recovery.
4671                                  */
4672                         case -NFS4ERR_DELEG_REVOKED:
4673                         case -NFS4ERR_ADMIN_REVOKED:
4674                         case -NFS4ERR_BAD_STATEID:
4675                         case -NFS4ERR_OPENMODE:
4676                                 nfs4_schedule_stateid_recovery(server, state);
4677                                 err = 0;
4678                                 goto out;
4679                         case -EKEYEXPIRED:
4680                                 /*
4681                                  * User RPCSEC_GSS context has expired.
4682                                  * We cannot recover this stateid now, so
4683                                  * skip it and allow recovery thread to
4684                                  * proceed.
4685                                  */
4686                                 err = 0;
4687                                 goto out;
4688                         case -ENOMEM:
4689                         case -NFS4ERR_DENIED:
4690                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4691                                 err = 0;
4692                                 goto out;
4693                         case -NFS4ERR_DELAY:
4694                                 break;
4695                 }
4696                 err = nfs4_handle_exception(server, err, &exception);
4697         } while (exception.retry);
4698 out:
4699         return err;
4700 }
4701
4702 static void nfs4_release_lockowner_release(void *calldata)
4703 {
4704         kfree(calldata);
4705 }
4706
4707 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4708         .rpc_release = nfs4_release_lockowner_release,
4709 };
4710
4711 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4712 {
4713         struct nfs_server *server = lsp->ls_state->owner->so_server;
4714         struct nfs_release_lockowner_args *args;
4715         struct rpc_message msg = {
4716                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4717         };
4718
4719         if (server->nfs_client->cl_mvops->minor_version != 0)
4720                 return;
4721         args = kmalloc(sizeof(*args), GFP_NOFS);
4722         if (!args)
4723                 return;
4724         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4725         args->lock_owner.id = lsp->ls_id.id;
4726         args->lock_owner.s_dev = server->s_dev;
4727         msg.rpc_argp = args;
4728         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4729 }
4730
4731 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4732
4733 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4734                                    const void *buf, size_t buflen,
4735                                    int flags, int type)
4736 {
4737         if (strcmp(key, "") != 0)
4738                 return -EINVAL;
4739
4740         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4741 }
4742
4743 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4744                                    void *buf, size_t buflen, int type)
4745 {
4746         if (strcmp(key, "") != 0)
4747                 return -EINVAL;
4748
4749         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4750 }
4751
4752 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4753                                        size_t list_len, const char *name,
4754                                        size_t name_len, int type)
4755 {
4756         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4757
4758         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4759                 return 0;
4760
4761         if (list && len <= list_len)
4762                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4763         return len;
4764 }
4765
4766 /*
4767  * nfs_fhget will use either the mounted_on_fileid or the fileid
4768  */
4769 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4770 {
4771         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4772                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4773               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4774               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4775                 return;
4776
4777         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4778                 NFS_ATTR_FATTR_NLINK;
4779         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4780         fattr->nlink = 2;
4781 }
4782
4783 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4784                 struct nfs4_fs_locations *fs_locations, struct page *page)
4785 {
4786         struct nfs_server *server = NFS_SERVER(dir);
4787         u32 bitmask[2] = {
4788                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4789         };
4790         struct nfs4_fs_locations_arg args = {
4791                 .dir_fh = NFS_FH(dir),
4792                 .name = name,
4793                 .page = page,
4794                 .bitmask = bitmask,
4795         };
4796         struct nfs4_fs_locations_res res = {
4797                 .fs_locations = fs_locations,
4798         };
4799         struct rpc_message msg = {
4800                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4801                 .rpc_argp = &args,
4802                 .rpc_resp = &res,
4803         };
4804         int status;
4805
4806         dprintk("%s: start\n", __func__);
4807
4808         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4809          * is not supported */
4810         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4811                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4812         else
4813                 bitmask[0] |= FATTR4_WORD0_FILEID;
4814
4815         nfs_fattr_init(&fs_locations->fattr);
4816         fs_locations->server = server;
4817         fs_locations->nlocations = 0;
4818         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4819         dprintk("%s: returned status = %d\n", __func__, status);
4820         return status;
4821 }
4822
4823 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4824 {
4825         int status;
4826         struct nfs4_secinfo_arg args = {
4827                 .dir_fh = NFS_FH(dir),
4828                 .name   = name,
4829         };
4830         struct nfs4_secinfo_res res = {
4831                 .flavors     = flavors,
4832         };
4833         struct rpc_message msg = {
4834                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4835                 .rpc_argp = &args,
4836                 .rpc_resp = &res,
4837         };
4838
4839         dprintk("NFS call  secinfo %s\n", name->name);
4840         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4841         dprintk("NFS reply  secinfo: %d\n", status);
4842         return status;
4843 }
4844
4845 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4846 {
4847         struct nfs4_exception exception = { };
4848         int err;
4849         do {
4850                 err = nfs4_handle_exception(NFS_SERVER(dir),
4851                                 _nfs4_proc_secinfo(dir, name, flavors),
4852                                 &exception);
4853         } while (exception.retry);
4854         return err;
4855 }
4856
4857 #ifdef CONFIG_NFS_V4_1
4858 /*
4859  * Check the exchange flags returned by the server for invalid flags, having
4860  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4861  * DS flags set.
4862  */
4863 static int nfs4_check_cl_exchange_flags(u32 flags)
4864 {
4865         if (flags & ~EXCHGID4_FLAG_MASK_R)
4866                 goto out_inval;
4867         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4868             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4869                 goto out_inval;
4870         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4871                 goto out_inval;
4872         return NFS_OK;
4873 out_inval:
4874         return -NFS4ERR_INVAL;
4875 }
4876
4877 static bool
4878 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4879 {
4880         if (a->server_scope_sz == b->server_scope_sz &&
4881             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4882                 return true;
4883
4884         return false;
4885 }
4886
4887 /*
4888  * nfs4_proc_exchange_id()
4889  *
4890  * Since the clientid has expired, all compounds using sessions
4891  * associated with the stale clientid will be returning
4892  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4893  * be in some phase of session reset.
4894  */
4895 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4896 {
4897         nfs4_verifier verifier;
4898         struct nfs41_exchange_id_args args = {
4899                 .client = clp,
4900                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4901         };
4902         struct nfs41_exchange_id_res res = {
4903                 .client = clp,
4904         };
4905         int status;
4906         struct rpc_message msg = {
4907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4908                 .rpc_argp = &args,
4909                 .rpc_resp = &res,
4910                 .rpc_cred = cred,
4911         };
4912         __be32 *p;
4913
4914         dprintk("--> %s\n", __func__);
4915         BUG_ON(clp == NULL);
4916
4917         p = (u32 *)verifier.data;
4918         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4919         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4920         args.verifier = &verifier;
4921
4922         args.id_len = scnprintf(args.id, sizeof(args.id),
4923                                 "%s/%s.%s/%u",
4924                                 clp->cl_ipaddr,
4925                                 init_utsname()->nodename,
4926                                 init_utsname()->domainname,
4927                                 clp->cl_rpcclient->cl_auth->au_flavor);
4928
4929         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4930         if (unlikely(!res.server_scope)) {
4931                 status = -ENOMEM;
4932                 goto out;
4933         }
4934
4935         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4936         if (!status)
4937                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4938
4939         if (!status) {
4940                 if (clp->server_scope &&
4941                     !nfs41_same_server_scope(clp->server_scope,
4942                                              res.server_scope)) {
4943                         dprintk("%s: server_scope mismatch detected\n",
4944                                 __func__);
4945                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4946                         kfree(clp->server_scope);
4947                         clp->server_scope = NULL;
4948                 }
4949
4950                 if (!clp->server_scope) {
4951                         clp->server_scope = res.server_scope;
4952                         goto out;
4953                 }
4954         }
4955         kfree(res.server_scope);
4956 out:
4957         dprintk("<-- %s status= %d\n", __func__, status);
4958         return status;
4959 }
4960
4961 struct nfs4_get_lease_time_data {
4962         struct nfs4_get_lease_time_args *args;
4963         struct nfs4_get_lease_time_res *res;
4964         struct nfs_client *clp;
4965 };
4966
4967 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4968                                         void *calldata)
4969 {
4970         int ret;
4971         struct nfs4_get_lease_time_data *data =
4972                         (struct nfs4_get_lease_time_data *)calldata;
4973
4974         dprintk("--> %s\n", __func__);
4975         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4976         /* just setup sequence, do not trigger session recovery
4977            since we're invoked within one */
4978         ret = nfs41_setup_sequence(data->clp->cl_session,
4979                                    &data->args->la_seq_args,
4980                                    &data->res->lr_seq_res, 0, task);
4981
4982         BUG_ON(ret == -EAGAIN);
4983         rpc_call_start(task);
4984         dprintk("<-- %s\n", __func__);
4985 }
4986
4987 /*
4988  * Called from nfs4_state_manager thread for session setup, so don't recover
4989  * from sequence operation or clientid errors.
4990  */
4991 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4992 {
4993         struct nfs4_get_lease_time_data *data =
4994                         (struct nfs4_get_lease_time_data *)calldata;
4995
4996         dprintk("--> %s\n", __func__);
4997         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4998                 return;
4999         switch (task->tk_status) {
5000         case -NFS4ERR_DELAY:
5001         case -NFS4ERR_GRACE:
5002                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5003                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5004                 task->tk_status = 0;
5005                 /* fall through */
5006         case -NFS4ERR_RETRY_UNCACHED_REP:
5007                 rpc_restart_call_prepare(task);
5008                 return;
5009         }
5010         dprintk("<-- %s\n", __func__);
5011 }
5012
5013 struct rpc_call_ops nfs4_get_lease_time_ops = {
5014         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5015         .rpc_call_done = nfs4_get_lease_time_done,
5016 };
5017
5018 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5019 {
5020         struct rpc_task *task;
5021         struct nfs4_get_lease_time_args args;
5022         struct nfs4_get_lease_time_res res = {
5023                 .lr_fsinfo = fsinfo,
5024         };
5025         struct nfs4_get_lease_time_data data = {
5026                 .args = &args,
5027                 .res = &res,
5028                 .clp = clp,
5029         };
5030         struct rpc_message msg = {
5031                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5032                 .rpc_argp = &args,
5033                 .rpc_resp = &res,
5034         };
5035         struct rpc_task_setup task_setup = {
5036                 .rpc_client = clp->cl_rpcclient,
5037                 .rpc_message = &msg,
5038                 .callback_ops = &nfs4_get_lease_time_ops,
5039                 .callback_data = &data,
5040                 .flags = RPC_TASK_TIMEOUT,
5041         };
5042         int status;
5043
5044         dprintk("--> %s\n", __func__);
5045         task = rpc_run_task(&task_setup);
5046
5047         if (IS_ERR(task))
5048                 status = PTR_ERR(task);
5049         else {
5050                 status = task->tk_status;
5051                 rpc_put_task(task);
5052         }
5053         dprintk("<-- %s return %d\n", __func__, status);
5054
5055         return status;
5056 }
5057
5058 /*
5059  * Reset a slot table
5060  */
5061 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5062                                  int ivalue)
5063 {
5064         struct nfs4_slot *new = NULL;
5065         int i;
5066         int ret = 0;
5067
5068         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5069                 max_reqs, tbl->max_slots);
5070
5071         /* Does the newly negotiated max_reqs match the existing slot table? */
5072         if (max_reqs != tbl->max_slots) {
5073                 ret = -ENOMEM;
5074                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5075                               GFP_NOFS);
5076                 if (!new)
5077                         goto out;
5078                 ret = 0;
5079                 kfree(tbl->slots);
5080         }
5081         spin_lock(&tbl->slot_tbl_lock);
5082         if (new) {
5083                 tbl->slots = new;
5084                 tbl->max_slots = max_reqs;
5085         }
5086         for (i = 0; i < tbl->max_slots; ++i)
5087                 tbl->slots[i].seq_nr = ivalue;
5088         spin_unlock(&tbl->slot_tbl_lock);
5089         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5090                 tbl, tbl->slots, tbl->max_slots);
5091 out:
5092         dprintk("<-- %s: return %d\n", __func__, ret);
5093         return ret;
5094 }
5095
5096 /*
5097  * Reset the forechannel and backchannel slot tables
5098  */
5099 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5100 {
5101         int status;
5102
5103         status = nfs4_reset_slot_table(&session->fc_slot_table,
5104                         session->fc_attrs.max_reqs, 1);
5105         if (status)
5106                 return status;
5107
5108         status = nfs4_reset_slot_table(&session->bc_slot_table,
5109                         session->bc_attrs.max_reqs, 0);
5110         return status;
5111 }
5112
5113 /* Destroy the slot table */
5114 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5115 {
5116         if (session->fc_slot_table.slots != NULL) {
5117                 kfree(session->fc_slot_table.slots);
5118                 session->fc_slot_table.slots = NULL;
5119         }
5120         if (session->bc_slot_table.slots != NULL) {
5121                 kfree(session->bc_slot_table.slots);
5122                 session->bc_slot_table.slots = NULL;
5123         }
5124         return;
5125 }
5126
5127 /*
5128  * Initialize slot table
5129  */
5130 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5131                 int max_slots, int ivalue)
5132 {
5133         struct nfs4_slot *slot;
5134         int ret = -ENOMEM;
5135
5136         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5137
5138         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5139
5140         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5141         if (!slot)
5142                 goto out;
5143         ret = 0;
5144
5145         spin_lock(&tbl->slot_tbl_lock);
5146         tbl->max_slots = max_slots;
5147         tbl->slots = slot;
5148         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5149         spin_unlock(&tbl->slot_tbl_lock);
5150         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5151                 tbl, tbl->slots, tbl->max_slots);
5152 out:
5153         dprintk("<-- %s: return %d\n", __func__, ret);
5154         return ret;
5155 }
5156
5157 /*
5158  * Initialize the forechannel and backchannel tables
5159  */
5160 static int nfs4_init_slot_tables(struct nfs4_session *session)
5161 {
5162         struct nfs4_slot_table *tbl;
5163         int status = 0;
5164
5165         tbl = &session->fc_slot_table;
5166         if (tbl->slots == NULL) {
5167                 status = nfs4_init_slot_table(tbl,
5168                                 session->fc_attrs.max_reqs, 1);
5169                 if (status)
5170                         return status;
5171         }
5172
5173         tbl = &session->bc_slot_table;
5174         if (tbl->slots == NULL) {
5175                 status = nfs4_init_slot_table(tbl,
5176                                 session->bc_attrs.max_reqs, 0);
5177                 if (status)
5178                         nfs4_destroy_slot_tables(session);
5179         }
5180
5181         return status;
5182 }
5183
5184 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5185 {
5186         struct nfs4_session *session;
5187         struct nfs4_slot_table *tbl;
5188
5189         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5190         if (!session)
5191                 return NULL;
5192
5193         tbl = &session->fc_slot_table;
5194         tbl->highest_used_slotid = -1;
5195         spin_lock_init(&tbl->slot_tbl_lock);
5196         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5197         init_completion(&tbl->complete);
5198
5199         tbl = &session->bc_slot_table;
5200         tbl->highest_used_slotid = -1;
5201         spin_lock_init(&tbl->slot_tbl_lock);
5202         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5203         init_completion(&tbl->complete);
5204
5205         session->session_state = 1<<NFS4_SESSION_INITING;
5206
5207         session->clp = clp;
5208         return session;
5209 }
5210
5211 void nfs4_destroy_session(struct nfs4_session *session)
5212 {
5213         nfs4_proc_destroy_session(session);
5214         dprintk("%s Destroy backchannel for xprt %p\n",
5215                 __func__, session->clp->cl_rpcclient->cl_xprt);
5216         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5217                                 NFS41_BC_MIN_CALLBACKS);
5218         nfs4_destroy_slot_tables(session);
5219         kfree(session);
5220 }
5221
5222 /*
5223  * Initialize the values to be used by the client in CREATE_SESSION
5224  * If nfs4_init_session set the fore channel request and response sizes,
5225  * use them.
5226  *
5227  * Set the back channel max_resp_sz_cached to zero to force the client to
5228  * always set csa_cachethis to FALSE because the current implementation
5229  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5230  */
5231 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5232 {
5233         struct nfs4_session *session = args->client->cl_session;
5234         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5235                      mxresp_sz = session->fc_attrs.max_resp_sz;
5236
5237         if (mxrqst_sz == 0)
5238                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5239         if (mxresp_sz == 0)
5240                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5241         /* Fore channel attributes */
5242         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5243         args->fc_attrs.max_resp_sz = mxresp_sz;
5244         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5245         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5246
5247         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5248                 "max_ops=%u max_reqs=%u\n",
5249                 __func__,
5250                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5251                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5252
5253         /* Back channel attributes */
5254         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5255         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5256         args->bc_attrs.max_resp_sz_cached = 0;
5257         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5258         args->bc_attrs.max_reqs = 1;
5259
5260         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5261                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5262                 __func__,
5263                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5264                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5265                 args->bc_attrs.max_reqs);
5266 }
5267
5268 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5269 {
5270         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5271         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5272
5273         if (rcvd->max_resp_sz > sent->max_resp_sz)
5274                 return -EINVAL;
5275         /*
5276          * Our requested max_ops is the minimum we need; we're not
5277          * prepared to break up compounds into smaller pieces than that.
5278          * So, no point even trying to continue if the server won't
5279          * cooperate:
5280          */
5281         if (rcvd->max_ops < sent->max_ops)
5282                 return -EINVAL;
5283         if (rcvd->max_reqs == 0)
5284                 return -EINVAL;
5285         return 0;
5286 }
5287
5288 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5289 {
5290         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5291         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5292
5293         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5294                 return -EINVAL;
5295         if (rcvd->max_resp_sz < sent->max_resp_sz)
5296                 return -EINVAL;
5297         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5298                 return -EINVAL;
5299         /* These would render the backchannel useless: */
5300         if (rcvd->max_ops  == 0)
5301                 return -EINVAL;
5302         if (rcvd->max_reqs == 0)
5303                 return -EINVAL;
5304         return 0;
5305 }
5306
5307 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5308                                      struct nfs4_session *session)
5309 {
5310         int ret;
5311
5312         ret = nfs4_verify_fore_channel_attrs(args, session);
5313         if (ret)
5314                 return ret;
5315         return nfs4_verify_back_channel_attrs(args, session);
5316 }
5317
5318 static int _nfs4_proc_create_session(struct nfs_client *clp)
5319 {
5320         struct nfs4_session *session = clp->cl_session;
5321         struct nfs41_create_session_args args = {
5322                 .client = clp,
5323                 .cb_program = NFS4_CALLBACK,
5324         };
5325         struct nfs41_create_session_res res = {
5326                 .client = clp,
5327         };
5328         struct rpc_message msg = {
5329                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5330                 .rpc_argp = &args,
5331                 .rpc_resp = &res,
5332         };
5333         int status;
5334
5335         nfs4_init_channel_attrs(&args);
5336         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5337
5338         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5339
5340         if (!status)
5341                 /* Verify the session's negotiated channel_attrs values */
5342                 status = nfs4_verify_channel_attrs(&args, session);
5343         if (!status) {
5344                 /* Increment the clientid slot sequence id */
5345                 clp->cl_seqid++;
5346         }
5347
5348         return status;
5349 }
5350
5351 /*
5352  * Issues a CREATE_SESSION operation to the server.
5353  * It is the responsibility of the caller to verify the session is
5354  * expired before calling this routine.
5355  */
5356 int nfs4_proc_create_session(struct nfs_client *clp)
5357 {
5358         int status;
5359         unsigned *ptr;
5360         struct nfs4_session *session = clp->cl_session;
5361
5362         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5363
5364         status = _nfs4_proc_create_session(clp);
5365         if (status)
5366                 goto out;
5367
5368         /* Init and reset the fore channel */
5369         status = nfs4_init_slot_tables(session);
5370         dprintk("slot table initialization returned %d\n", status);
5371         if (status)
5372                 goto out;
5373         status = nfs4_reset_slot_tables(session);
5374         dprintk("slot table reset returned %d\n", status);
5375         if (status)
5376                 goto out;
5377
5378         ptr = (unsigned *)&session->sess_id.data[0];
5379         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5380                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5381 out:
5382         dprintk("<-- %s\n", __func__);
5383         return status;
5384 }
5385
5386 /*
5387  * Issue the over-the-wire RPC DESTROY_SESSION.
5388  * The caller must serialize access to this routine.
5389  */
5390 int nfs4_proc_destroy_session(struct nfs4_session *session)
5391 {
5392         int status = 0;
5393         struct rpc_message msg;
5394
5395         dprintk("--> nfs4_proc_destroy_session\n");
5396
5397         /* session is still being setup */
5398         if (session->clp->cl_cons_state != NFS_CS_READY)
5399                 return status;
5400
5401         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5402         msg.rpc_argp = session;
5403         msg.rpc_resp = NULL;
5404         msg.rpc_cred = NULL;
5405         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5406
5407         if (status)
5408                 printk(KERN_WARNING
5409                         "Got error %d from the server on DESTROY_SESSION. "
5410                         "Session has been destroyed regardless...\n", status);
5411
5412         dprintk("<-- nfs4_proc_destroy_session\n");
5413         return status;
5414 }
5415
5416 int nfs4_init_session(struct nfs_server *server)
5417 {
5418         struct nfs_client *clp = server->nfs_client;
5419         struct nfs4_session *session;
5420         unsigned int rsize, wsize;
5421         int ret;
5422
5423         if (!nfs4_has_session(clp))
5424                 return 0;
5425
5426         session = clp->cl_session;
5427         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5428                 return 0;
5429
5430         rsize = server->rsize;
5431         if (rsize == 0)
5432                 rsize = NFS_MAX_FILE_IO_SIZE;
5433         wsize = server->wsize;
5434         if (wsize == 0)
5435                 wsize = NFS_MAX_FILE_IO_SIZE;
5436
5437         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5438         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5439
5440         ret = nfs4_recover_expired_lease(server);
5441         if (!ret)
5442                 ret = nfs4_check_client_ready(clp);
5443         return ret;
5444 }
5445
5446 int nfs4_init_ds_session(struct nfs_client *clp)
5447 {
5448         struct nfs4_session *session = clp->cl_session;
5449         int ret;
5450
5451         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5452                 return 0;
5453
5454         ret = nfs4_client_recover_expired_lease(clp);
5455         if (!ret)
5456                 /* Test for the DS role */
5457                 if (!is_ds_client(clp))
5458                         ret = -ENODEV;
5459         if (!ret)
5460                 ret = nfs4_check_client_ready(clp);
5461         return ret;
5462
5463 }
5464 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5465
5466
5467 /*
5468  * Renew the cl_session lease.
5469  */
5470 struct nfs4_sequence_data {
5471         struct nfs_client *clp;
5472         struct nfs4_sequence_args args;
5473         struct nfs4_sequence_res res;
5474 };
5475
5476 static void nfs41_sequence_release(void *data)
5477 {
5478         struct nfs4_sequence_data *calldata = data;
5479         struct nfs_client *clp = calldata->clp;
5480
5481         if (atomic_read(&clp->cl_count) > 1)
5482                 nfs4_schedule_state_renewal(clp);
5483         nfs_put_client(clp);
5484         kfree(calldata);
5485 }
5486
5487 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5488 {
5489         switch(task->tk_status) {
5490         case -NFS4ERR_DELAY:
5491                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5492                 return -EAGAIN;
5493         default:
5494                 nfs4_schedule_lease_recovery(clp);
5495         }
5496         return 0;
5497 }
5498
5499 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5500 {
5501         struct nfs4_sequence_data *calldata = data;
5502         struct nfs_client *clp = calldata->clp;
5503
5504         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5505                 return;
5506
5507         if (task->tk_status < 0) {
5508                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5509                 if (atomic_read(&clp->cl_count) == 1)
5510                         goto out;
5511
5512                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5513                         rpc_restart_call_prepare(task);
5514                         return;
5515                 }
5516         }
5517         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5518 out:
5519         dprintk("<-- %s\n", __func__);
5520 }
5521
5522 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5523 {
5524         struct nfs4_sequence_data *calldata = data;
5525         struct nfs_client *clp = calldata->clp;
5526         struct nfs4_sequence_args *args;
5527         struct nfs4_sequence_res *res;
5528
5529         args = task->tk_msg.rpc_argp;
5530         res = task->tk_msg.rpc_resp;
5531
5532         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5533                 return;
5534         rpc_call_start(task);
5535 }
5536
5537 static const struct rpc_call_ops nfs41_sequence_ops = {
5538         .rpc_call_done = nfs41_sequence_call_done,
5539         .rpc_call_prepare = nfs41_sequence_prepare,
5540         .rpc_release = nfs41_sequence_release,
5541 };
5542
5543 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5544 {
5545         struct nfs4_sequence_data *calldata;
5546         struct rpc_message msg = {
5547                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5548                 .rpc_cred = cred,
5549         };
5550         struct rpc_task_setup task_setup_data = {
5551                 .rpc_client = clp->cl_rpcclient,
5552                 .rpc_message = &msg,
5553                 .callback_ops = &nfs41_sequence_ops,
5554                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5555         };
5556
5557         if (!atomic_inc_not_zero(&clp->cl_count))
5558                 return ERR_PTR(-EIO);
5559         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5560         if (calldata == NULL) {
5561                 nfs_put_client(clp);
5562                 return ERR_PTR(-ENOMEM);
5563         }
5564         msg.rpc_argp = &calldata->args;
5565         msg.rpc_resp = &calldata->res;
5566         calldata->clp = clp;
5567         task_setup_data.callback_data = calldata;
5568
5569         return rpc_run_task(&task_setup_data);
5570 }
5571
5572 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5573 {
5574         struct rpc_task *task;
5575         int ret = 0;
5576
5577         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5578                 return 0;
5579         task = _nfs41_proc_sequence(clp, cred);
5580         if (IS_ERR(task))
5581                 ret = PTR_ERR(task);
5582         else
5583                 rpc_put_task_async(task);
5584         dprintk("<-- %s status=%d\n", __func__, ret);
5585         return ret;
5586 }
5587
5588 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5589 {
5590         struct rpc_task *task;
5591         int ret;
5592
5593         task = _nfs41_proc_sequence(clp, cred);
5594         if (IS_ERR(task)) {
5595                 ret = PTR_ERR(task);
5596                 goto out;
5597         }
5598         ret = rpc_wait_for_completion_task(task);
5599         if (!ret) {
5600                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5601
5602                 if (task->tk_status == 0)
5603                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5604                 ret = task->tk_status;
5605         }
5606         rpc_put_task(task);
5607 out:
5608         dprintk("<-- %s status=%d\n", __func__, ret);
5609         return ret;
5610 }
5611
5612 struct nfs4_reclaim_complete_data {
5613         struct nfs_client *clp;
5614         struct nfs41_reclaim_complete_args arg;
5615         struct nfs41_reclaim_complete_res res;
5616 };
5617
5618 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5619 {
5620         struct nfs4_reclaim_complete_data *calldata = data;
5621
5622         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5623         if (nfs41_setup_sequence(calldata->clp->cl_session,
5624                                 &calldata->arg.seq_args,
5625                                 &calldata->res.seq_res, 0, task))
5626                 return;
5627
5628         rpc_call_start(task);
5629 }
5630
5631 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5632 {
5633         switch(task->tk_status) {
5634         case 0:
5635         case -NFS4ERR_COMPLETE_ALREADY:
5636         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5637                 break;
5638         case -NFS4ERR_DELAY:
5639                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5640                 /* fall through */
5641         case -NFS4ERR_RETRY_UNCACHED_REP:
5642                 return -EAGAIN;
5643         default:
5644                 nfs4_schedule_lease_recovery(clp);
5645         }
5646         return 0;
5647 }
5648
5649 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5650 {
5651         struct nfs4_reclaim_complete_data *calldata = data;
5652         struct nfs_client *clp = calldata->clp;
5653         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5654
5655         dprintk("--> %s\n", __func__);
5656         if (!nfs41_sequence_done(task, res))
5657                 return;
5658
5659         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5660                 rpc_restart_call_prepare(task);
5661                 return;
5662         }
5663         dprintk("<-- %s\n", __func__);
5664 }
5665
5666 static void nfs4_free_reclaim_complete_data(void *data)
5667 {
5668         struct nfs4_reclaim_complete_data *calldata = data;
5669
5670         kfree(calldata);
5671 }
5672
5673 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5674         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5675         .rpc_call_done = nfs4_reclaim_complete_done,
5676         .rpc_release = nfs4_free_reclaim_complete_data,
5677 };
5678
5679 /*
5680  * Issue a global reclaim complete.
5681  */
5682 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5683 {
5684         struct nfs4_reclaim_complete_data *calldata;
5685         struct rpc_task *task;
5686         struct rpc_message msg = {
5687                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5688         };
5689         struct rpc_task_setup task_setup_data = {
5690                 .rpc_client = clp->cl_rpcclient,
5691                 .rpc_message = &msg,
5692                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5693                 .flags = RPC_TASK_ASYNC,
5694         };
5695         int status = -ENOMEM;
5696
5697         dprintk("--> %s\n", __func__);
5698         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5699         if (calldata == NULL)
5700                 goto out;
5701         calldata->clp = clp;
5702         calldata->arg.one_fs = 0;
5703
5704         msg.rpc_argp = &calldata->arg;
5705         msg.rpc_resp = &calldata->res;
5706         task_setup_data.callback_data = calldata;
5707         task = rpc_run_task(&task_setup_data);
5708         if (IS_ERR(task)) {
5709                 status = PTR_ERR(task);
5710                 goto out;
5711         }
5712         status = nfs4_wait_for_completion_rpc_task(task);
5713         if (status == 0)
5714                 status = task->tk_status;
5715         rpc_put_task(task);
5716         return 0;
5717 out:
5718         dprintk("<-- %s status=%d\n", __func__, status);
5719         return status;
5720 }
5721
5722 static void
5723 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5724 {
5725         struct nfs4_layoutget *lgp = calldata;
5726         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5727
5728         dprintk("--> %s\n", __func__);
5729         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5730          * right now covering the LAYOUTGET we are about to send.
5731          * However, that is not so catastrophic, and there seems
5732          * to be no way to prevent it completely.
5733          */
5734         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5735                                 &lgp->res.seq_res, 0, task))
5736                 return;
5737         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5738                                           NFS_I(lgp->args.inode)->layout,
5739                                           lgp->args.ctx->state)) {
5740                 rpc_exit(task, NFS4_OK);
5741                 return;
5742         }
5743         rpc_call_start(task);
5744 }
5745
5746 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5747 {
5748         struct nfs4_layoutget *lgp = calldata;
5749         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5750
5751         dprintk("--> %s\n", __func__);
5752
5753         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5754                 return;
5755
5756         switch (task->tk_status) {
5757         case 0:
5758                 break;
5759         case -NFS4ERR_LAYOUTTRYLATER:
5760         case -NFS4ERR_RECALLCONFLICT:
5761                 task->tk_status = -NFS4ERR_DELAY;
5762                 /* Fall through */
5763         default:
5764                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5765                         rpc_restart_call_prepare(task);
5766                         return;
5767                 }
5768         }
5769         dprintk("<-- %s\n", __func__);
5770 }
5771
5772 static void nfs4_layoutget_release(void *calldata)
5773 {
5774         struct nfs4_layoutget *lgp = calldata;
5775
5776         dprintk("--> %s\n", __func__);
5777         put_nfs_open_context(lgp->args.ctx);
5778         kfree(calldata);
5779         dprintk("<-- %s\n", __func__);
5780 }
5781
5782 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5783         .rpc_call_prepare = nfs4_layoutget_prepare,
5784         .rpc_call_done = nfs4_layoutget_done,
5785         .rpc_release = nfs4_layoutget_release,
5786 };
5787
5788 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5789 {
5790         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5791         struct rpc_task *task;
5792         struct rpc_message msg = {
5793                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5794                 .rpc_argp = &lgp->args,
5795                 .rpc_resp = &lgp->res,
5796         };
5797         struct rpc_task_setup task_setup_data = {
5798                 .rpc_client = server->client,
5799                 .rpc_message = &msg,
5800                 .callback_ops = &nfs4_layoutget_call_ops,
5801                 .callback_data = lgp,
5802                 .flags = RPC_TASK_ASYNC,
5803         };
5804         int status = 0;
5805
5806         dprintk("--> %s\n", __func__);
5807
5808         lgp->res.layoutp = &lgp->args.layout;
5809         lgp->res.seq_res.sr_slot = NULL;
5810         task = rpc_run_task(&task_setup_data);
5811         if (IS_ERR(task))
5812                 return PTR_ERR(task);
5813         status = nfs4_wait_for_completion_rpc_task(task);
5814         if (status == 0)
5815                 status = task->tk_status;
5816         if (status == 0)
5817                 status = pnfs_layout_process(lgp);
5818         rpc_put_task(task);
5819         dprintk("<-- %s status=%d\n", __func__, status);
5820         return status;
5821 }
5822
5823 static void
5824 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5825 {
5826         struct nfs4_layoutreturn *lrp = calldata;
5827
5828         dprintk("--> %s\n", __func__);
5829         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5830                                 &lrp->res.seq_res, 0, task))
5831                 return;
5832         rpc_call_start(task);
5833 }
5834
5835 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5836 {
5837         struct nfs4_layoutreturn *lrp = calldata;
5838         struct nfs_server *server;
5839         struct pnfs_layout_hdr *lo = lrp->args.layout;
5840
5841         dprintk("--> %s\n", __func__);
5842
5843         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5844                 return;
5845
5846         server = NFS_SERVER(lrp->args.inode);
5847         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5848                 rpc_restart_call_prepare(task);
5849                 return;
5850         }
5851         spin_lock(&lo->plh_inode->i_lock);
5852         if (task->tk_status == 0) {
5853                 if (lrp->res.lrs_present) {
5854                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5855                 } else
5856                         BUG_ON(!list_empty(&lo->plh_segs));
5857         }
5858         lo->plh_block_lgets--;
5859         spin_unlock(&lo->plh_inode->i_lock);
5860         dprintk("<-- %s\n", __func__);
5861 }
5862
5863 static void nfs4_layoutreturn_release(void *calldata)
5864 {
5865         struct nfs4_layoutreturn *lrp = calldata;
5866
5867         dprintk("--> %s\n", __func__);
5868         put_layout_hdr(lrp->args.layout);
5869         kfree(calldata);
5870         dprintk("<-- %s\n", __func__);
5871 }
5872
5873 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5874         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5875         .rpc_call_done = nfs4_layoutreturn_done,
5876         .rpc_release = nfs4_layoutreturn_release,
5877 };
5878
5879 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5880 {
5881         struct rpc_task *task;
5882         struct rpc_message msg = {
5883                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5884                 .rpc_argp = &lrp->args,
5885                 .rpc_resp = &lrp->res,
5886         };
5887         struct rpc_task_setup task_setup_data = {
5888                 .rpc_client = lrp->clp->cl_rpcclient,
5889                 .rpc_message = &msg,
5890                 .callback_ops = &nfs4_layoutreturn_call_ops,
5891                 .callback_data = lrp,
5892         };
5893         int status;
5894
5895         dprintk("--> %s\n", __func__);
5896         task = rpc_run_task(&task_setup_data);
5897         if (IS_ERR(task))
5898                 return PTR_ERR(task);
5899         status = task->tk_status;
5900         dprintk("<-- %s status=%d\n", __func__, status);
5901         rpc_put_task(task);
5902         return status;
5903 }
5904
5905 /*
5906  * Retrieve the list of Data Server devices from the MDS.
5907  */
5908 static int _nfs4_getdevicelist(struct nfs_server *server,
5909                                     const struct nfs_fh *fh,
5910                                     struct pnfs_devicelist *devlist)
5911 {
5912         struct nfs4_getdevicelist_args args = {
5913                 .fh = fh,
5914                 .layoutclass = server->pnfs_curr_ld->id,
5915         };
5916         struct nfs4_getdevicelist_res res = {
5917                 .devlist = devlist,
5918         };
5919         struct rpc_message msg = {
5920                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5921                 .rpc_argp = &args,
5922                 .rpc_resp = &res,
5923         };
5924         int status;
5925
5926         dprintk("--> %s\n", __func__);
5927         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5928                                 &res.seq_res, 0);
5929         dprintk("<-- %s status=%d\n", __func__, status);
5930         return status;
5931 }
5932
5933 int nfs4_proc_getdevicelist(struct nfs_server *server,
5934                             const struct nfs_fh *fh,
5935                             struct pnfs_devicelist *devlist)
5936 {
5937         struct nfs4_exception exception = { };
5938         int err;
5939
5940         do {
5941                 err = nfs4_handle_exception(server,
5942                                 _nfs4_getdevicelist(server, fh, devlist),
5943                                 &exception);
5944         } while (exception.retry);
5945
5946         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5947                 err, devlist->num_devs);
5948
5949         return err;
5950 }
5951 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5952
5953 static int
5954 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5955 {
5956         struct nfs4_getdeviceinfo_args args = {
5957                 .pdev = pdev,
5958         };
5959         struct nfs4_getdeviceinfo_res res = {
5960                 .pdev = pdev,
5961         };
5962         struct rpc_message msg = {
5963                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5964                 .rpc_argp = &args,
5965                 .rpc_resp = &res,
5966         };
5967         int status;
5968
5969         dprintk("--> %s\n", __func__);
5970         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5971         dprintk("<-- %s status=%d\n", __func__, status);
5972
5973         return status;
5974 }
5975
5976 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5977 {
5978         struct nfs4_exception exception = { };
5979         int err;
5980
5981         do {
5982                 err = nfs4_handle_exception(server,
5983                                         _nfs4_proc_getdeviceinfo(server, pdev),
5984                                         &exception);
5985         } while (exception.retry);
5986         return err;
5987 }
5988 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5989
5990 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5991 {
5992         struct nfs4_layoutcommit_data *data = calldata;
5993         struct nfs_server *server = NFS_SERVER(data->args.inode);
5994
5995         if (nfs4_setup_sequence(server, &data->args.seq_args,
5996                                 &data->res.seq_res, 1, task))
5997                 return;
5998         rpc_call_start(task);
5999 }
6000
6001 static void
6002 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6003 {
6004         struct nfs4_layoutcommit_data *data = calldata;
6005         struct nfs_server *server = NFS_SERVER(data->args.inode);
6006
6007         if (!nfs4_sequence_done(task, &data->res.seq_res))
6008                 return;
6009
6010         switch (task->tk_status) { /* Just ignore these failures */
6011         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6012         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6013         case -NFS4ERR_BADLAYOUT:     /* no layout */
6014         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6015                 task->tk_status = 0;
6016                 break;
6017         case 0:
6018                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6019                                                    data->res.fattr);
6020                 break;
6021         default:
6022                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6023                         rpc_restart_call_prepare(task);
6024                         return;
6025                 }
6026         }
6027 }
6028
6029 static void nfs4_layoutcommit_release(void *calldata)
6030 {
6031         struct nfs4_layoutcommit_data *data = calldata;
6032         struct pnfs_layout_segment *lseg, *tmp;
6033         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6034
6035         pnfs_cleanup_layoutcommit(data);
6036         /* Matched by references in pnfs_set_layoutcommit */
6037         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6038                 list_del_init(&lseg->pls_lc_list);
6039                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6040                                        &lseg->pls_flags))
6041                         put_lseg(lseg);
6042         }
6043
6044         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6045         smp_mb__after_clear_bit();
6046         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6047
6048         put_rpccred(data->cred);
6049         kfree(data);
6050 }
6051
6052 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6053         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6054         .rpc_call_done = nfs4_layoutcommit_done,
6055         .rpc_release = nfs4_layoutcommit_release,
6056 };
6057
6058 int
6059 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6060 {
6061         struct rpc_message msg = {
6062                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6063                 .rpc_argp = &data->args,
6064                 .rpc_resp = &data->res,
6065                 .rpc_cred = data->cred,
6066         };
6067         struct rpc_task_setup task_setup_data = {
6068                 .task = &data->task,
6069                 .rpc_client = NFS_CLIENT(data->args.inode),
6070                 .rpc_message = &msg,
6071                 .callback_ops = &nfs4_layoutcommit_ops,
6072                 .callback_data = data,
6073                 .flags = RPC_TASK_ASYNC,
6074         };
6075         struct rpc_task *task;
6076         int status = 0;
6077
6078         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6079                 "lbw: %llu inode %lu\n",
6080                 data->task.tk_pid, sync,
6081                 data->args.lastbytewritten,
6082                 data->args.inode->i_ino);
6083
6084         task = rpc_run_task(&task_setup_data);
6085         if (IS_ERR(task))
6086                 return PTR_ERR(task);
6087         if (sync == false)
6088                 goto out;
6089         status = nfs4_wait_for_completion_rpc_task(task);
6090         if (status != 0)
6091                 goto out;
6092         status = task->tk_status;
6093 out:
6094         dprintk("%s: status %d\n", __func__, status);
6095         rpc_put_task(task);
6096         return status;
6097 }
6098
6099 static int
6100 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6101                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6102 {
6103         struct nfs41_secinfo_no_name_args args = {
6104                 .style = SECINFO_STYLE_CURRENT_FH,
6105         };
6106         struct nfs4_secinfo_res res = {
6107                 .flavors = flavors,
6108         };
6109         struct rpc_message msg = {
6110                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6111                 .rpc_argp = &args,
6112                 .rpc_resp = &res,
6113         };
6114         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6115 }
6116
6117 static int
6118 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6119                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6120 {
6121         struct nfs4_exception exception = { };
6122         int err;
6123         do {
6124                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6125                 switch (err) {
6126                 case 0:
6127                 case -NFS4ERR_WRONGSEC:
6128                 case -NFS4ERR_NOTSUPP:
6129                         goto out;
6130                 default:
6131                         err = nfs4_handle_exception(server, err, &exception);
6132                 }
6133         } while (exception.retry);
6134 out:
6135         return err;
6136 }
6137
6138 static int
6139 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6140                     struct nfs_fsinfo *info)
6141 {
6142         int err;
6143         struct page *page;
6144         rpc_authflavor_t flavor;
6145         struct nfs4_secinfo_flavors *flavors;
6146
6147         page = alloc_page(GFP_KERNEL);
6148         if (!page) {
6149                 err = -ENOMEM;
6150                 goto out;
6151         }
6152
6153         flavors = page_address(page);
6154         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6155
6156         /*
6157          * Fall back on "guess and check" method if
6158          * the server doesn't support SECINFO_NO_NAME
6159          */
6160         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6161                 err = nfs4_find_root_sec(server, fhandle, info);
6162                 goto out_freepage;
6163         }
6164         if (err)
6165                 goto out_freepage;
6166
6167         flavor = nfs_find_best_sec(flavors);
6168         if (err == 0)
6169                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6170
6171 out_freepage:
6172         put_page(page);
6173         if (err == -EACCES)
6174                 return -EPERM;
6175 out:
6176         return err;
6177 }
6178 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6179 {
6180         int status;
6181         struct nfs41_test_stateid_args args = {
6182                 .stateid = &state->stateid,
6183         };
6184         struct nfs41_test_stateid_res res;
6185         struct rpc_message msg = {
6186                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6187                 .rpc_argp = &args,
6188                 .rpc_resp = &res,
6189         };
6190         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6191         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6192         return status;
6193 }
6194
6195 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6196 {
6197         struct nfs4_exception exception = { };
6198         int err;
6199         do {
6200                 err = nfs4_handle_exception(server,
6201                                 _nfs41_test_stateid(server, state),
6202                                 &exception);
6203         } while (exception.retry);
6204         return err;
6205 }
6206
6207 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6208 {
6209         int status;
6210         struct nfs41_free_stateid_args args = {
6211                 .stateid = &state->stateid,
6212         };
6213         struct nfs41_free_stateid_res res;
6214         struct rpc_message msg = {
6215                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6216                 .rpc_argp = &args,
6217                 .rpc_resp = &res,
6218         };
6219
6220         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6221         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6222         return status;
6223 }
6224
6225 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6226 {
6227         struct nfs4_exception exception = { };
6228         int err;
6229         do {
6230                 err = nfs4_handle_exception(server,
6231                                 _nfs4_free_stateid(server, state),
6232                                 &exception);
6233         } while (exception.retry);
6234         return err;
6235 }
6236 #endif /* CONFIG_NFS_V4_1 */
6237
6238 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6239         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6240         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6241         .recover_open   = nfs4_open_reclaim,
6242         .recover_lock   = nfs4_lock_reclaim,
6243         .establish_clid = nfs4_init_clientid,
6244         .get_clid_cred  = nfs4_get_setclientid_cred,
6245 };
6246
6247 #if defined(CONFIG_NFS_V4_1)
6248 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6249         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6250         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6251         .recover_open   = nfs4_open_reclaim,
6252         .recover_lock   = nfs4_lock_reclaim,
6253         .establish_clid = nfs41_init_clientid,
6254         .get_clid_cred  = nfs4_get_exchange_id_cred,
6255         .reclaim_complete = nfs41_proc_reclaim_complete,
6256 };
6257 #endif /* CONFIG_NFS_V4_1 */
6258
6259 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6260         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6261         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6262         .recover_open   = nfs4_open_expired,
6263         .recover_lock   = nfs4_lock_expired,
6264         .establish_clid = nfs4_init_clientid,
6265         .get_clid_cred  = nfs4_get_setclientid_cred,
6266 };
6267
6268 #if defined(CONFIG_NFS_V4_1)
6269 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6270         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6271         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6272         .recover_open   = nfs41_open_expired,
6273         .recover_lock   = nfs41_lock_expired,
6274         .establish_clid = nfs41_init_clientid,
6275         .get_clid_cred  = nfs4_get_exchange_id_cred,
6276 };
6277 #endif /* CONFIG_NFS_V4_1 */
6278
6279 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6280         .sched_state_renewal = nfs4_proc_async_renew,
6281         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6282         .renew_lease = nfs4_proc_renew,
6283 };
6284
6285 #if defined(CONFIG_NFS_V4_1)
6286 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6287         .sched_state_renewal = nfs41_proc_async_sequence,
6288         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6289         .renew_lease = nfs4_proc_sequence,
6290 };
6291 #endif
6292
6293 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6294         .minor_version = 0,
6295         .call_sync = _nfs4_call_sync,
6296         .validate_stateid = nfs4_validate_delegation_stateid,
6297         .find_root_sec = nfs4_find_root_sec,
6298         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6299         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6300         .state_renewal_ops = &nfs40_state_renewal_ops,
6301 };
6302
6303 #if defined(CONFIG_NFS_V4_1)
6304 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6305         .minor_version = 1,
6306         .call_sync = _nfs4_call_sync_session,
6307         .validate_stateid = nfs41_validate_delegation_stateid,
6308         .find_root_sec = nfs41_find_root_sec,
6309         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6310         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6311         .state_renewal_ops = &nfs41_state_renewal_ops,
6312 };
6313 #endif
6314
6315 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6316         [0] = &nfs_v4_0_minor_ops,
6317 #if defined(CONFIG_NFS_V4_1)
6318         [1] = &nfs_v4_1_minor_ops,
6319 #endif
6320 };
6321
6322 static const struct inode_operations nfs4_file_inode_operations = {
6323         .permission     = nfs_permission,
6324         .getattr        = nfs_getattr,
6325         .setattr        = nfs_setattr,
6326         .getxattr       = generic_getxattr,
6327         .setxattr       = generic_setxattr,
6328         .listxattr      = generic_listxattr,
6329         .removexattr    = generic_removexattr,
6330 };
6331
6332 const struct nfs_rpc_ops nfs_v4_clientops = {
6333         .version        = 4,                    /* protocol version */
6334         .dentry_ops     = &nfs4_dentry_operations,
6335         .dir_inode_ops  = &nfs4_dir_inode_operations,
6336         .file_inode_ops = &nfs4_file_inode_operations,
6337         .file_ops       = &nfs4_file_operations,
6338         .getroot        = nfs4_proc_get_root,
6339         .getattr        = nfs4_proc_getattr,
6340         .setattr        = nfs4_proc_setattr,
6341         .lookup         = nfs4_proc_lookup,
6342         .access         = nfs4_proc_access,
6343         .readlink       = nfs4_proc_readlink,
6344         .create         = nfs4_proc_create,
6345         .remove         = nfs4_proc_remove,
6346         .unlink_setup   = nfs4_proc_unlink_setup,
6347         .unlink_done    = nfs4_proc_unlink_done,
6348         .rename         = nfs4_proc_rename,
6349         .rename_setup   = nfs4_proc_rename_setup,
6350         .rename_done    = nfs4_proc_rename_done,
6351         .link           = nfs4_proc_link,
6352         .symlink        = nfs4_proc_symlink,
6353         .mkdir          = nfs4_proc_mkdir,
6354         .rmdir          = nfs4_proc_remove,
6355         .readdir        = nfs4_proc_readdir,
6356         .mknod          = nfs4_proc_mknod,
6357         .statfs         = nfs4_proc_statfs,
6358         .fsinfo         = nfs4_proc_fsinfo,
6359         .pathconf       = nfs4_proc_pathconf,
6360         .set_capabilities = nfs4_server_capabilities,
6361         .decode_dirent  = nfs4_decode_dirent,
6362         .read_setup     = nfs4_proc_read_setup,
6363         .read_done      = nfs4_read_done,
6364         .write_setup    = nfs4_proc_write_setup,
6365         .write_done     = nfs4_write_done,
6366         .commit_setup   = nfs4_proc_commit_setup,
6367         .commit_done    = nfs4_commit_done,
6368         .lock           = nfs4_proc_lock,
6369         .clear_acl_cache = nfs4_zap_acl_attr,
6370         .close_context  = nfs4_close_context,
6371         .open_context   = nfs4_atomic_open,
6372         .init_client    = nfs4_init_client,
6373         .secinfo        = nfs4_proc_secinfo,
6374 };
6375
6376 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6377         .prefix = XATTR_NAME_NFSV4_ACL,
6378         .list   = nfs4_xattr_list_nfs4_acl,
6379         .get    = nfs4_xattr_get_nfs4_acl,
6380         .set    = nfs4_xattr_set_nfs4_acl,
6381 };
6382
6383 const struct xattr_handler *nfs4_xattr_handlers[] = {
6384         &nfs4_xattr_nfs4_acl_handler,
6385         NULL
6386 };
6387
6388 /*
6389  * Local variables:
6390  *  c-basic-offset: 8
6391  * End:
6392  */