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/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/sunrpc/gss_api.h>
  45 #include <linux/nfs.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/nfs_page.h>
  49 #include <linux/nfs_mount.h>
  50 #include <linux/namei.h>
  51 #include <linux/mount.h>
  52 #include <linux/module.h>
  53 #include <linux/sunrpc/bc_xprt.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "delegation.h"
  59 #include "internal.h"
  60 #include "iostat.h"
  61 #include "callback.h"
  62 #include "pnfs.h"
  63
  64 #define NFSDBG_FACILITY         NFSDBG_PROC
  65
  66 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  67 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  68
  69 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  70
  71 struct nfs4_opendata;
  72 static int _nfs4_proc_open(struct nfs4_opendata *data);
  73 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  74 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  75 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  76 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
  77                              const struct qstr *name, struct nfs_fh *fhandle,
  78                              struct nfs_fattr *fattr);
  79 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  80 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  81                             struct nfs_fattr *fattr, struct iattr *sattr,
  82                             struct nfs4_state *state);
  83
  84 /* Prevent leaks of NFSv4 errors into userland */
  85 static int nfs4_map_errors(int err)
  86 {
  87         if (err >= -1000)
  88                 return err;
  89         switch (err) {
  90         case -NFS4ERR_RESOURCE:
  91                 return -EREMOTEIO;
  92         case -NFS4ERR_WRONGSEC:
  93                 return -EPERM;
  94         case -NFS4ERR_BADOWNER:
  95         case -NFS4ERR_BADNAME:
  96                 return -EINVAL;
  97         default:
  98                 dprintk("%s could not handle NFSv4 error %d\n",
  99                                 __func__, -err);
 100                 break;
 101         }
 102         return -EIO;
 103 }
 104
 105 /*
 106  * This is our standard bitmap for GETATTR requests.
 107  */
 108 const u32 nfs4_fattr_bitmap[2] = {
 109         FATTR4_WORD0_TYPE
 110         | FATTR4_WORD0_CHANGE
 111         | FATTR4_WORD0_SIZE
 112         | FATTR4_WORD0_FSID
 113         | FATTR4_WORD0_FILEID,
 114         FATTR4_WORD1_MODE
 115         | FATTR4_WORD1_NUMLINKS
 116         | FATTR4_WORD1_OWNER
 117         | FATTR4_WORD1_OWNER_GROUP
 118         | FATTR4_WORD1_RAWDEV
 119         | FATTR4_WORD1_SPACE_USED
 120         | FATTR4_WORD1_TIME_ACCESS
 121         | FATTR4_WORD1_TIME_METADATA
 122         | FATTR4_WORD1_TIME_MODIFY
 123 };
 124
 125 const u32 nfs4_statfs_bitmap[2] = {
 126         FATTR4_WORD0_FILES_AVAIL
 127         | FATTR4_WORD0_FILES_FREE
 128         | FATTR4_WORD0_FILES_TOTAL,
 129         FATTR4_WORD1_SPACE_AVAIL
 130         | FATTR4_WORD1_SPACE_FREE
 131         | FATTR4_WORD1_SPACE_TOTAL
 132 };
 133
 134 const u32 nfs4_pathconf_bitmap[2] = {
 135         FATTR4_WORD0_MAXLINK
 136         | FATTR4_WORD0_MAXNAME,
 137         0
 138 };
 139
 140 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 141                         | FATTR4_WORD0_MAXREAD
 142                         | FATTR4_WORD0_MAXWRITE
 143                         | FATTR4_WORD0_LEASE_TIME,
 144                         FATTR4_WORD1_TIME_DELTA
 145                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 146 };
 147
 148 const u32 nfs4_fs_locations_bitmap[2] = {
 149         FATTR4_WORD0_TYPE
 150         | FATTR4_WORD0_CHANGE
 151         | FATTR4_WORD0_SIZE
 152         | FATTR4_WORD0_FSID
 153         | FATTR4_WORD0_FILEID
 154         | FATTR4_WORD0_FS_LOCATIONS,
 155         FATTR4_WORD1_MODE
 156         | FATTR4_WORD1_NUMLINKS
 157         | FATTR4_WORD1_OWNER
 158         | FATTR4_WORD1_OWNER_GROUP
 159         | FATTR4_WORD1_RAWDEV
 160         | FATTR4_WORD1_SPACE_USED
 161         | FATTR4_WORD1_TIME_ACCESS
 162         | FATTR4_WORD1_TIME_METADATA
 163         | FATTR4_WORD1_TIME_MODIFY
 164         | FATTR4_WORD1_MOUNTED_ON_FILEID
 165 };
 166
 167 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 168                 struct nfs4_readdir_arg *readdir)
 169 {
 170         __be32 *start, *p;
 171
 172         BUG_ON(readdir->count < 80);
 173         if (cookie > 2) {
 174                 readdir->cookie = cookie;
 175                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 176                 return;
 177         }
 178
 179         readdir->cookie = 0;
 180         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 181         if (cookie == 2)
 182                 return;
 183
 184         /*
 185          * NFSv4 servers do not return entries for '.' and '..'
 186          * Therefore, we fake these entries here.  We let '.'
 187          * have cookie 0 and '..' have cookie 1.  Note that
 188          * when talking to the server, we always send cookie 0
 189          * instead of 1 or 2.
 190          */
 191         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 192
 193         if (cookie == 0) {
 194                 *p++ = xdr_one;                                  /* next */
 195                 *p++ = xdr_zero;                   /* cookie, first word */
 196                 *p++ = xdr_one;                   /* cookie, second word */
 197                 *p++ = xdr_one;                             /* entry len */
 198                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 199                 p++;
 200                 *p++ = xdr_one;                         /* bitmap length */
 201                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 202                 *p++ = htonl(8);              /* attribute buffer length */
 203                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 204         }
 205
 206         *p++ = xdr_one;                                  /* next */
 207         *p++ = xdr_zero;                   /* cookie, first word */
 208         *p++ = xdr_two;                   /* cookie, second word */
 209         *p++ = xdr_two;                             /* entry len */
 210         memcpy(p, "..\0\0", 4);                         /* entry */
 211         p++;
 212         *p++ = xdr_one;                         /* bitmap length */
 213         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 214         *p++ = htonl(8);              /* attribute buffer length */
 215         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 216
 217         readdir->pgbase = (char *)p - (char *)start;
 218         readdir->count -= readdir->pgbase;
 219         kunmap_atomic(start, KM_USER0);
 220 }
 221
 222 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 223 {
 224         int res;
 225
 226         might_sleep();
 227
 228         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 229                         nfs_wait_bit_killable, TASK_KILLABLE);
 230         return res;
 231 }
 232
 233 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 234 {
 235         int res = 0;
 236
 237         might_sleep();
 238
 239         if (*timeout <= 0)
 240                 *timeout = NFS4_POLL_RETRY_MIN;
 241         if (*timeout > NFS4_POLL_RETRY_MAX)
 242                 *timeout = NFS4_POLL_RETRY_MAX;
 243         schedule_timeout_killable(*timeout);
 244         if (fatal_signal_pending(current))
 245                 res = -ERESTARTSYS;
 246         *timeout <<= 1;
 247         return res;
 248 }
 249
 250 /* This is the error handling routine for processes that are allowed
 251  * to sleep.
 252  */
 253 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 254 {
 255         struct nfs_client *clp = server->nfs_client;
 256         struct nfs4_state *state = exception->state;
 257         int ret = errorcode;
 258
 259         exception->retry = 0;
 260         switch(errorcode) {
 261                 case 0:
 262                         return 0;
 263                 case -NFS4ERR_ADMIN_REVOKED:
 264                 case -NFS4ERR_BAD_STATEID:
 265                 case -NFS4ERR_OPENMODE:
 266                         if (state == NULL)
 267                                 break;
 268                         nfs4_schedule_stateid_recovery(server, state);
 269                         goto wait_on_recovery;
 270                 case -NFS4ERR_EXPIRED:
 271                         if (state != NULL)
 272                                 nfs4_schedule_stateid_recovery(server, state);
 273                 case -NFS4ERR_STALE_STATEID:
 274                 case -NFS4ERR_STALE_CLIENTID:
 275                         nfs4_schedule_lease_recovery(clp);
 276                         goto wait_on_recovery;
 277 #if defined(CONFIG_NFS_V4_1)
 278                 case -NFS4ERR_BADSESSION:
 279                 case -NFS4ERR_BADSLOT:
 280                 case -NFS4ERR_BAD_HIGH_SLOT:
 281                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 282                 case -NFS4ERR_DEADSESSION:
 283                 case -NFS4ERR_SEQ_FALSE_RETRY:
 284                 case -NFS4ERR_SEQ_MISORDERED:
 285                         dprintk("%s ERROR: %d Reset session\n", __func__,
 286                                 errorcode);
 287                         nfs4_schedule_session_recovery(clp->cl_session);
 288                         exception->retry = 1;
 289                         break;
 290 #endif /* defined(CONFIG_NFS_V4_1) */
 291                 case -NFS4ERR_FILE_OPEN:
 292                         if (exception->timeout > HZ) {
 293                                 /* We have retried a decent amount, time to
 294                                  * fail
 295                                  */
 296                                 ret = -EBUSY;
 297                                 break;
 298                         }
 299                 case -NFS4ERR_GRACE:
 300                 case -NFS4ERR_DELAY:
 301                 case -EKEYEXPIRED:
 302                         ret = nfs4_delay(server->client, &exception->timeout);
 303                         if (ret != 0)
 304                                 break;
 305                 case -NFS4ERR_RETRY_UNCACHED_REP:
 306                 case -NFS4ERR_OLD_STATEID:
 307                         exception->retry = 1;
 308                         break;
 309                 case -NFS4ERR_BADOWNER:
 310                         /* The following works around a Linux server bug! */
 311                 case -NFS4ERR_BADNAME:
 312                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 313                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 314                                 exception->retry = 1;
 315                                 printk(KERN_WARNING "NFS: v4 server %s "
 316                                                 "does not accept raw "
 317                                                 "uid/gids. "
 318                                                 "Reenabling the idmapper.\n",
 319                                                 server->nfs_client->cl_hostname);
 320                         }
 321         }
 322         /* We failed to handle the error */
 323         return nfs4_map_errors(ret);
 324 wait_on_recovery:
 325         ret = nfs4_wait_clnt_recover(clp);
 326         if (ret == 0)
 327                 exception->retry = 1;
 328         return ret;
 329 }
 330
 331
 332 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 333 {
 334         spin_lock(&clp->cl_lock);
 335         if (time_before(clp->cl_last_renewal,timestamp))
 336                 clp->cl_last_renewal = timestamp;
 337         spin_unlock(&clp->cl_lock);
 338 }
 339
 340 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 341 {
 342         do_renew_lease(server->nfs_client, timestamp);
 343 }
 344
 345 #if defined(CONFIG_NFS_V4_1)
 346
 347 /*
 348  * nfs4_free_slot - free a slot and efficiently update slot table.
 349  *
 350  * freeing a slot is trivially done by clearing its respective bit
 351  * in the bitmap.
 352  * If the freed slotid equals highest_used_slotid we want to update it
 353  * so that the server would be able to size down the slot table if needed,
 354  * otherwise we know that the highest_used_slotid is still in use.
 355  * When updating highest_used_slotid there may be "holes" in the bitmap
 356  * so we need to scan down from highest_used_slotid to 0 looking for the now
 357  * highest slotid in use.
 358  * If none found, highest_used_slotid is set to -1.
 359  *
 360  * Must be called while holding tbl->slot_tbl_lock
 361  */
 362 static void
 363 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 364 {
 365         int free_slotid = free_slot - tbl->slots;
 366         int slotid = free_slotid;
 367
 368         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 369         /* clear used bit in bitmap */
 370         __clear_bit(slotid, tbl->used_slots);
 371
 372         /* update highest_used_slotid when it is freed */
 373         if (slotid == tbl->highest_used_slotid) {
 374                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 375                 if (slotid < tbl->max_slots)
 376                         tbl->highest_used_slotid = slotid;
 377                 else
 378                         tbl->highest_used_slotid = -1;
 379         }
 380         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 381                 free_slotid, tbl->highest_used_slotid);
 382 }
 383
 384 /*
 385  * Signal state manager thread if session fore channel is drained
 386  */
 387 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 388 {
 389         struct rpc_task *task;
 390
 391         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 392                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 393                 if (task)
 394                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 395                 return;
 396         }
 397
 398         if (ses->fc_slot_table.highest_used_slotid != -1)
 399                 return;
 400
 401         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 402         complete(&ses->fc_slot_table.complete);
 403 }
 404
 405 /*
 406  * Signal state manager thread if session back channel is drained
 407  */
 408 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 409 {
 410         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 411             ses->bc_slot_table.highest_used_slotid != -1)
 412                 return;
 413         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 414         complete(&ses->bc_slot_table.complete);
 415 }
 416
 417 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 418 {
 419         struct nfs4_slot_table *tbl;
 420
 421         tbl = &res->sr_session->fc_slot_table;
 422         if (!res->sr_slot) {
 423                 /* just wake up the next guy waiting since
 424                  * we may have not consumed a slot after all */
 425                 dprintk("%s: No slot\n", __func__);
 426                 return;
 427         }
 428
 429         spin_lock(&tbl->slot_tbl_lock);
 430         nfs4_free_slot(tbl, res->sr_slot);
 431         nfs4_check_drain_fc_complete(res->sr_session);
 432         spin_unlock(&tbl->slot_tbl_lock);
 433         res->sr_slot = NULL;
 434 }
 435
 436 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 437 {
 438         unsigned long timestamp;
 439         struct nfs_client *clp;
 440
 441         /*
 442          * sr_status remains 1 if an RPC level error occurred. The server
 443          * may or may not have processed the sequence operation..
 444          * Proceed as if the server received and processed the sequence
 445          * operation.
 446          */
 447         if (res->sr_status == 1)
 448                 res->sr_status = NFS_OK;
 449
 450         /* don't increment the sequence number if the task wasn't sent */
 451         if (!RPC_WAS_SENT(task))
 452                 goto out;
 453
 454         /* Check the SEQUENCE operation status */
 455         switch (res->sr_status) {
 456         case 0:
 457                 /* Update the slot's sequence and clientid lease timer */
 458                 ++res->sr_slot->seq_nr;
 459                 timestamp = res->sr_renewal_time;
 460                 clp = res->sr_session->clp;
 461                 do_renew_lease(clp, timestamp);
 462                 /* Check sequence flags */
 463                 if (res->sr_status_flags != 0)
 464                         nfs4_schedule_lease_recovery(clp);
 465                 break;
 466         case -NFS4ERR_DELAY:
 467                 /* The server detected a resend of the RPC call and
 468                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 469                  * of RFC5661.
 470                  */
 471                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 472                         __func__,
 473                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 474                         res->sr_slot->seq_nr);
 475                 goto out_retry;
 476         default:
 477                 /* Just update the slot sequence no. */
 478                 ++res->sr_slot->seq_nr;
 479         }
 480 out:
 481         /* The session may be reset by one of the error handlers. */
 482         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 483         nfs41_sequence_free_slot(res);
 484         return 1;
 485 out_retry:
 486         if (!rpc_restart_call(task))
 487                 goto out;
 488         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 489         return 0;
 490 }
 491
 492 static int nfs4_sequence_done(struct rpc_task *task,
 493                                struct nfs4_sequence_res *res)
 494 {
 495         if (res->sr_session == NULL)
 496                 return 1;
 497         return nfs41_sequence_done(task, res);
 498 }
 499
 500 /*
 501  * nfs4_find_slot - efficiently look for a free slot
 502  *
 503  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 504  * If found, we mark the slot as used, update the highest_used_slotid,
 505  * and respectively set up the sequence operation args.
 506  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 507  *
 508  * Note: must be called with under the slot_tbl_lock.
 509  */
 510 static u8
 511 nfs4_find_slot(struct nfs4_slot_table *tbl)
 512 {
 513         int slotid;
 514         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 515         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 516
 517         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 518                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 519                 tbl->max_slots);
 520         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 521         if (slotid >= tbl->max_slots)
 522                 goto out;
 523         __set_bit(slotid, tbl->used_slots);
 524         if (slotid > tbl->highest_used_slotid)
 525                 tbl->highest_used_slotid = slotid;
 526         ret_id = slotid;
 527 out:
 528         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 529                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 530         return ret_id;
 531 }
 532
 533 int nfs41_setup_sequence(struct nfs4_session *session,
 534                                 struct nfs4_sequence_args *args,
 535                                 struct nfs4_sequence_res *res,
 536                                 int cache_reply,
 537                                 struct rpc_task *task)
 538 {
 539         struct nfs4_slot *slot;
 540         struct nfs4_slot_table *tbl;
 541         u8 slotid;
 542
 543         dprintk("--> %s\n", __func__);
 544         /* slot already allocated? */
 545         if (res->sr_slot != NULL)
 546                 return 0;
 547
 548         tbl = &session->fc_slot_table;
 549
 550         spin_lock(&tbl->slot_tbl_lock);
 551         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 552             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 553                 /*
 554                  * The state manager will wait until the slot table is empty.
 555                  * Schedule the reset thread
 556                  */
 557                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 558                 spin_unlock(&tbl->slot_tbl_lock);
 559                 dprintk("%s Schedule Session Reset\n", __func__);
 560                 return -EAGAIN;
 561         }
 562
 563         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 564             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 565                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 566                 spin_unlock(&tbl->slot_tbl_lock);
 567                 dprintk("%s enforce FIFO order\n", __func__);
 568                 return -EAGAIN;
 569         }
 570
 571         slotid = nfs4_find_slot(tbl);
 572         if (slotid == NFS4_MAX_SLOT_TABLE) {
 573                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 574                 spin_unlock(&tbl->slot_tbl_lock);
 575                 dprintk("<-- %s: no free slots\n", __func__);
 576                 return -EAGAIN;
 577         }
 578         spin_unlock(&tbl->slot_tbl_lock);
 579
 580         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 581         slot = tbl->slots + slotid;
 582         args->sa_session = session;
 583         args->sa_slotid = slotid;
 584         args->sa_cache_this = cache_reply;
 585
 586         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 587
 588         res->sr_session = session;
 589         res->sr_slot = slot;
 590         res->sr_renewal_time = jiffies;
 591         res->sr_status_flags = 0;
 592         /*
 593          * sr_status is only set in decode_sequence, and so will remain
 594          * set to 1 if an rpc level failure occurs.
 595          */
 596         res->sr_status = 1;
 597         return 0;
 598 }
 599 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 600
 601 int nfs4_setup_sequence(const struct nfs_server *server,
 602                         struct nfs4_sequence_args *args,
 603                         struct nfs4_sequence_res *res,
 604                         int cache_reply,
 605                         struct rpc_task *task)
 606 {
 607         struct nfs4_session *session = nfs4_get_session(server);
 608         int ret = 0;
 609
 610         if (session == NULL) {
 611                 args->sa_session = NULL;
 612                 res->sr_session = NULL;
 613                 goto out;
 614         }
 615
 616         dprintk("--> %s clp %p session %p sr_slot %td\n",
 617                 __func__, session->clp, session, res->sr_slot ?
 618                         res->sr_slot - session->fc_slot_table.slots : -1);
 619
 620         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 621                                    task);
 622 out:
 623         dprintk("<-- %s status=%d\n", __func__, ret);
 624         return ret;
 625 }
 626
 627 struct nfs41_call_sync_data {
 628         const struct nfs_server *seq_server;
 629         struct nfs4_sequence_args *seq_args;
 630         struct nfs4_sequence_res *seq_res;
 631         int cache_reply;
 632 };
 633
 634 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 635 {
 636         struct nfs41_call_sync_data *data = calldata;
 637
 638         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 639
 640         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 641                                 data->seq_res, data->cache_reply, task))
 642                 return;
 643         rpc_call_start(task);
 644 }
 645
 646 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 647 {
 648         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 649         nfs41_call_sync_prepare(task, calldata);
 650 }
 651
 652 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 653 {
 654         struct nfs41_call_sync_data *data = calldata;
 655
 656         nfs41_sequence_done(task, data->seq_res);
 657 }
 658
 659 struct rpc_call_ops nfs41_call_sync_ops = {
 660         .rpc_call_prepare = nfs41_call_sync_prepare,
 661         .rpc_call_done = nfs41_call_sync_done,
 662 };
 663
 664 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 665         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 666         .rpc_call_done = nfs41_call_sync_done,
 667 };
 668
 669 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 670                                    struct nfs_server *server,
 671                                    struct rpc_message *msg,
 672                                    struct nfs4_sequence_args *args,
 673                                    struct nfs4_sequence_res *res,
 674                                    int cache_reply,
 675                                    int privileged)
 676 {
 677         int ret;
 678         struct rpc_task *task;
 679         struct nfs41_call_sync_data data = {
 680                 .seq_server = server,
 681                 .seq_args = args,
 682                 .seq_res = res,
 683                 .cache_reply = cache_reply,
 684         };
 685         struct rpc_task_setup task_setup = {
 686                 .rpc_client = clnt,
 687                 .rpc_message = msg,
 688                 .callback_ops = &nfs41_call_sync_ops,
 689                 .callback_data = &data
 690         };
 691
 692         res->sr_slot = NULL;
 693         if (privileged)
 694                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 695         task = rpc_run_task(&task_setup);
 696         if (IS_ERR(task))
 697                 ret = PTR_ERR(task);
 698         else {
 699                 ret = task->tk_status;
 700                 rpc_put_task(task);
 701         }
 702         return ret;
 703 }
 704
 705 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 706                             struct nfs_server *server,
 707                             struct rpc_message *msg,
 708                             struct nfs4_sequence_args *args,
 709                             struct nfs4_sequence_res *res,
 710                             int cache_reply)
 711 {
 712         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 713 }
 714
 715 #else
 716 static int nfs4_sequence_done(struct rpc_task *task,
 717                                struct nfs4_sequence_res *res)
 718 {
 719         return 1;
 720 }
 721 #endif /* CONFIG_NFS_V4_1 */
 722
 723 int _nfs4_call_sync(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         args->sa_session = res->sr_session = NULL;
 731         return rpc_call_sync(clnt, msg, 0);
 732 }
 733
 734 static inline
 735 int nfs4_call_sync(struct rpc_clnt *clnt,
 736                    struct nfs_server *server,
 737                    struct rpc_message *msg,
 738                    struct nfs4_sequence_args *args,
 739                    struct nfs4_sequence_res *res,
 740                    int cache_reply)
 741 {
 742         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 743                                                 args, res, cache_reply);
 744 }
 745
 746 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 747 {
 748         struct nfs_inode *nfsi = NFS_I(dir);
 749
 750         spin_lock(&dir->i_lock);
 751         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 752         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 753                 nfs_force_lookup_revalidate(dir);
 754         nfsi->change_attr = cinfo->after;
 755         spin_unlock(&dir->i_lock);
 756 }
 757
 758 struct nfs4_opendata {
 759         struct kref kref;
 760         struct nfs_openargs o_arg;
 761         struct nfs_openres o_res;
 762         struct nfs_open_confirmargs c_arg;
 763         struct nfs_open_confirmres c_res;
 764         struct nfs_fattr f_attr;
 765         struct nfs_fattr dir_attr;
 766         struct path path;
 767         struct dentry *dir;
 768         struct nfs4_state_owner *owner;
 769         struct nfs4_state *state;
 770         struct iattr attrs;
 771         unsigned long timestamp;
 772         unsigned int rpc_done : 1;
 773         int rpc_status;
 774         int cancelled;
 775 };
 776
 777
 778 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 779 {
 780         p->o_res.f_attr = &p->f_attr;
 781         p->o_res.dir_attr = &p->dir_attr;
 782         p->o_res.seqid = p->o_arg.seqid;
 783         p->c_res.seqid = p->c_arg.seqid;
 784         p->o_res.server = p->o_arg.server;
 785         nfs_fattr_init(&p->f_attr);
 786         nfs_fattr_init(&p->dir_attr);
 787 }
 788
 789 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 790                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 791                 const struct iattr *attrs,
 792                 gfp_t gfp_mask)
 793 {
 794         struct dentry *parent = dget_parent(path->dentry);
 795         struct inode *dir = parent->d_inode;
 796         struct nfs_server *server = NFS_SERVER(dir);
 797         struct nfs4_opendata *p;
 798
 799         p = kzalloc(sizeof(*p), gfp_mask);
 800         if (p == NULL)
 801                 goto err;
 802         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 803         if (p->o_arg.seqid == NULL)
 804                 goto err_free;
 805         path_get(path);
 806         p->path = *path;
 807         p->dir = parent;
 808         p->owner = sp;
 809         atomic_inc(&sp->so_count);
 810         p->o_arg.fh = NFS_FH(dir);
 811         p->o_arg.open_flags = flags;
 812         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 813         p->o_arg.clientid = server->nfs_client->cl_clientid;
 814         p->o_arg.id = sp->so_owner_id.id;
 815         p->o_arg.name = &p->path.dentry->d_name;
 816         p->o_arg.server = server;
 817         p->o_arg.bitmask = server->attr_bitmask;
 818         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 819         if (flags & O_CREAT) {
 820                 u32 *s;
 821
 822                 p->o_arg.u.attrs = &p->attrs;
 823                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 824                 s = (u32 *) p->o_arg.u.verifier.data;
 825                 s[0] = jiffies;
 826                 s[1] = current->pid;
 827         }
 828         p->c_arg.fh = &p->o_res.fh;
 829         p->c_arg.stateid = &p->o_res.stateid;
 830         p->c_arg.seqid = p->o_arg.seqid;
 831         nfs4_init_opendata_res(p);
 832         kref_init(&p->kref);
 833         return p;
 834 err_free:
 835         kfree(p);
 836 err:
 837         dput(parent);
 838         return NULL;
 839 }
 840
 841 static void nfs4_opendata_free(struct kref *kref)
 842 {
 843         struct nfs4_opendata *p = container_of(kref,
 844                         struct nfs4_opendata, kref);
 845
 846         nfs_free_seqid(p->o_arg.seqid);
 847         if (p->state != NULL)
 848                 nfs4_put_open_state(p->state);
 849         nfs4_put_state_owner(p->owner);
 850         dput(p->dir);
 851         path_put(&p->path);
 852         kfree(p);
 853 }
 854
 855 static void nfs4_opendata_put(struct nfs4_opendata *p)
 856 {
 857         if (p != NULL)
 858                 kref_put(&p->kref, nfs4_opendata_free);
 859 }
 860
 861 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 862 {
 863         int ret;
 864
 865         ret = rpc_wait_for_completion_task(task);
 866         return ret;
 867 }
 868
 869 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 870 {
 871         int ret = 0;
 872
 873         if (open_mode & O_EXCL)
 874                 goto out;
 875         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 876                 case FMODE_READ:
 877                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 878                                 && state->n_rdonly != 0;
 879                         break;
 880                 case FMODE_WRITE:
 881                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 882                                 && state->n_wronly != 0;
 883                         break;
 884                 case FMODE_READ|FMODE_WRITE:
 885                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 886                                 && state->n_rdwr != 0;
 887         }
 888 out:
 889         return ret;
 890 }
 891
 892 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 893 {
 894         if ((delegation->type & fmode) != fmode)
 895                 return 0;
 896         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 897                 return 0;
 898         nfs_mark_delegation_referenced(delegation);
 899         return 1;
 900 }
 901
 902 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 903 {
 904         switch (fmode) {
 905                 case FMODE_WRITE:
 906                         state->n_wronly++;
 907                         break;
 908                 case FMODE_READ:
 909                         state->n_rdonly++;
 910                         break;
 911                 case FMODE_READ|FMODE_WRITE:
 912                         state->n_rdwr++;
 913         }
 914         nfs4_state_set_mode_locked(state, state->state | fmode);
 915 }
 916
 917 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 918 {
 919         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 920                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 921         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 922         switch (fmode) {
 923                 case FMODE_READ:
 924                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 925                         break;
 926                 case FMODE_WRITE:
 927                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 928                         break;
 929                 case FMODE_READ|FMODE_WRITE:
 930                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 931         }
 932 }
 933
 934 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 935 {
 936         write_seqlock(&state->seqlock);
 937         nfs_set_open_stateid_locked(state, stateid, fmode);
 938         write_sequnlock(&state->seqlock);
 939 }
 940
 941 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 942 {
 943         /*
 944          * Protect the call to nfs4_state_set_mode_locked and
 945          * serialise the stateid update
 946          */
 947         write_seqlock(&state->seqlock);
 948         if (deleg_stateid != NULL) {
 949                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 950                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 951         }
 952         if (open_stateid != NULL)
 953                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 954         write_sequnlock(&state->seqlock);
 955         spin_lock(&state->owner->so_lock);
 956         update_open_stateflags(state, fmode);
 957         spin_unlock(&state->owner->so_lock);
 958 }
 959
 960 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 961 {
 962         struct nfs_inode *nfsi = NFS_I(state->inode);
 963         struct nfs_delegation *deleg_cur;
 964         int ret = 0;
 965
 966         fmode &= (FMODE_READ|FMODE_WRITE);
 967
 968         rcu_read_lock();
 969         deleg_cur = rcu_dereference(nfsi->delegation);
 970         if (deleg_cur == NULL)
 971                 goto no_delegation;
 972
 973         spin_lock(&deleg_cur->lock);
 974         if (nfsi->delegation != deleg_cur ||
 975             (deleg_cur->type & fmode) != fmode)
 976                 goto no_delegation_unlock;
 977
 978         if (delegation == NULL)
 979                 delegation = &deleg_cur->stateid;
 980         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 981                 goto no_delegation_unlock;
 982
 983         nfs_mark_delegation_referenced(deleg_cur);
 984         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 985         ret = 1;
 986 no_delegation_unlock:
 987         spin_unlock(&deleg_cur->lock);
 988 no_delegation:
 989         rcu_read_unlock();
 990
 991         if (!ret && open_stateid != NULL) {
 992                 __update_open_stateid(state, open_stateid, NULL, fmode);
 993                 ret = 1;
 994         }
 995
 996         return ret;
 997 }
 998
 999
1000 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1001 {
1002         struct nfs_delegation *delegation;
1003
1004         rcu_read_lock();
1005         delegation = rcu_dereference(NFS_I(inode)->delegation);
1006         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1007                 rcu_read_unlock();
1008                 return;
1009         }
1010         rcu_read_unlock();
1011         nfs_inode_return_delegation(inode);
1012 }
1013
1014 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1015 {
1016         struct nfs4_state *state = opendata->state;
1017         struct nfs_inode *nfsi = NFS_I(state->inode);
1018         struct nfs_delegation *delegation;
1019         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1020         fmode_t fmode = opendata->o_arg.fmode;
1021         nfs4_stateid stateid;
1022         int ret = -EAGAIN;
1023
1024         for (;;) {
1025                 if (can_open_cached(state, fmode, open_mode)) {
1026                         spin_lock(&state->owner->so_lock);
1027                         if (can_open_cached(state, fmode, open_mode)) {
1028                                 update_open_stateflags(state, fmode);
1029                                 spin_unlock(&state->owner->so_lock);
1030                                 goto out_return_state;
1031                         }
1032                         spin_unlock(&state->owner->so_lock);
1033                 }
1034                 rcu_read_lock();
1035                 delegation = rcu_dereference(nfsi->delegation);
1036                 if (delegation == NULL ||
1037                     !can_open_delegated(delegation, fmode)) {
1038                         rcu_read_unlock();
1039                         break;
1040                 }
1041                 /* Save the delegation */
1042                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1043                 rcu_read_unlock();
1044                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1045                 if (ret != 0)
1046                         goto out;
1047                 ret = -EAGAIN;
1048
1049                 /* Try to update the stateid using the delegation */
1050                 if (update_open_stateid(state, NULL, &stateid, fmode))
1051                         goto out_return_state;
1052         }
1053 out:
1054         return ERR_PTR(ret);
1055 out_return_state:
1056         atomic_inc(&state->count);
1057         return state;
1058 }
1059
1060 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1061 {
1062         struct inode *inode;
1063         struct nfs4_state *state = NULL;
1064         struct nfs_delegation *delegation;
1065         int ret;
1066
1067         if (!data->rpc_done) {
1068                 state = nfs4_try_open_cached(data);
1069                 goto out;
1070         }
1071
1072         ret = -EAGAIN;
1073         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1074                 goto err;
1075         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1076         ret = PTR_ERR(inode);
1077         if (IS_ERR(inode))
1078                 goto err;
1079         ret = -ENOMEM;
1080         state = nfs4_get_open_state(inode, data->owner);
1081         if (state == NULL)
1082                 goto err_put_inode;
1083         if (data->o_res.delegation_type != 0) {
1084                 int delegation_flags = 0;
1085
1086                 rcu_read_lock();
1087                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1088                 if (delegation)
1089                         delegation_flags = delegation->flags;
1090                 rcu_read_unlock();
1091                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1092                         nfs_inode_set_delegation(state->inode,
1093                                         data->owner->so_cred,
1094                                         &data->o_res);
1095                 else
1096                         nfs_inode_reclaim_delegation(state->inode,
1097                                         data->owner->so_cred,
1098                                         &data->o_res);
1099         }
1100
1101         update_open_stateid(state, &data->o_res.stateid, NULL,
1102                         data->o_arg.fmode);
1103         iput(inode);
1104 out:
1105         return state;
1106 err_put_inode:
1107         iput(inode);
1108 err:
1109         return ERR_PTR(ret);
1110 }
1111
1112 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1113 {
1114         struct nfs_inode *nfsi = NFS_I(state->inode);
1115         struct nfs_open_context *ctx;
1116
1117         spin_lock(&state->inode->i_lock);
1118         list_for_each_entry(ctx, &nfsi->open_files, list) {
1119                 if (ctx->state != state)
1120                         continue;
1121                 get_nfs_open_context(ctx);
1122                 spin_unlock(&state->inode->i_lock);
1123                 return ctx;
1124         }
1125         spin_unlock(&state->inode->i_lock);
1126         return ERR_PTR(-ENOENT);
1127 }
1128
1129 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1130 {
1131         struct nfs4_opendata *opendata;
1132
1133         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1134         if (opendata == NULL)
1135                 return ERR_PTR(-ENOMEM);
1136         opendata->state = state;
1137         atomic_inc(&state->count);
1138         return opendata;
1139 }
1140
1141 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1142 {
1143         struct nfs4_state *newstate;
1144         int ret;
1145
1146         opendata->o_arg.open_flags = 0;
1147         opendata->o_arg.fmode = fmode;
1148         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1149         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1150         nfs4_init_opendata_res(opendata);
1151         ret = _nfs4_recover_proc_open(opendata);
1152         if (ret != 0)
1153                 return ret;
1154         newstate = nfs4_opendata_to_nfs4_state(opendata);
1155         if (IS_ERR(newstate))
1156                 return PTR_ERR(newstate);
1157         nfs4_close_state(&opendata->path, newstate, fmode);
1158         *res = newstate;
1159         return 0;
1160 }
1161
1162 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1163 {
1164         struct nfs4_state *newstate;
1165         int ret;
1166
1167         /* memory barrier prior to reading state->n_* */
1168         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1169         smp_rmb();
1170         if (state->n_rdwr != 0) {
1171                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1172                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1173                 if (ret != 0)
1174                         return ret;
1175                 if (newstate != state)
1176                         return -ESTALE;
1177         }
1178         if (state->n_wronly != 0) {
1179                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1180                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1181                 if (ret != 0)
1182                         return ret;
1183                 if (newstate != state)
1184                         return -ESTALE;
1185         }
1186         if (state->n_rdonly != 0) {
1187                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1188                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1189                 if (ret != 0)
1190                         return ret;
1191                 if (newstate != state)
1192                         return -ESTALE;
1193         }
1194         /*
1195          * We may have performed cached opens for all three recoveries.
1196          * Check if we need to update the current stateid.
1197          */
1198         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1199             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1200                 write_seqlock(&state->seqlock);
1201                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1202                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1203                 write_sequnlock(&state->seqlock);
1204         }
1205         return 0;
1206 }
1207
1208 /*
1209  * OPEN_RECLAIM:
1210  *      reclaim state on the server after a reboot.
1211  */
1212 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1213 {
1214         struct nfs_delegation *delegation;
1215         struct nfs4_opendata *opendata;
1216         fmode_t delegation_type = 0;
1217         int status;
1218
1219         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1220         if (IS_ERR(opendata))
1221                 return PTR_ERR(opendata);
1222         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1223         opendata->o_arg.fh = NFS_FH(state->inode);
1224         rcu_read_lock();
1225         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1226         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1227                 delegation_type = delegation->type;
1228         rcu_read_unlock();
1229         opendata->o_arg.u.delegation_type = delegation_type;
1230         status = nfs4_open_recover(opendata, state);
1231         nfs4_opendata_put(opendata);
1232         return status;
1233 }
1234
1235 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1236 {
1237         struct nfs_server *server = NFS_SERVER(state->inode);
1238         struct nfs4_exception exception = { };
1239         int err;
1240         do {
1241                 err = _nfs4_do_open_reclaim(ctx, state);
1242                 if (err != -NFS4ERR_DELAY)
1243                         break;
1244                 nfs4_handle_exception(server, err, &exception);
1245         } while (exception.retry);
1246         return err;
1247 }
1248
1249 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1250 {
1251         struct nfs_open_context *ctx;
1252         int ret;
1253
1254         ctx = nfs4_state_find_open_context(state);
1255         if (IS_ERR(ctx))
1256                 return PTR_ERR(ctx);
1257         ret = nfs4_do_open_reclaim(ctx, state);
1258         put_nfs_open_context(ctx);
1259         return ret;
1260 }
1261
1262 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1263 {
1264         struct nfs4_opendata *opendata;
1265         int ret;
1266
1267         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1268         if (IS_ERR(opendata))
1269                 return PTR_ERR(opendata);
1270         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1271         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1272                         sizeof(opendata->o_arg.u.delegation.data));
1273         ret = nfs4_open_recover(opendata, state);
1274         nfs4_opendata_put(opendata);
1275         return ret;
1276 }
1277
1278 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1279 {
1280         struct nfs4_exception exception = { };
1281         struct nfs_server *server = NFS_SERVER(state->inode);
1282         int err;
1283         do {
1284                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1285                 switch (err) {
1286                         case 0:
1287                         case -ENOENT:
1288                         case -ESTALE:
1289                                 goto out;
1290                         case -NFS4ERR_BADSESSION:
1291                         case -NFS4ERR_BADSLOT:
1292                         case -NFS4ERR_BAD_HIGH_SLOT:
1293                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1294                         case -NFS4ERR_DEADSESSION:
1295                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1296                                 goto out;
1297                         case -NFS4ERR_STALE_CLIENTID:
1298                         case -NFS4ERR_STALE_STATEID:
1299                         case -NFS4ERR_EXPIRED:
1300                                 /* Don't recall a delegation if it was lost */
1301                                 nfs4_schedule_lease_recovery(server->nfs_client);
1302                                 goto out;
1303                         case -ERESTARTSYS:
1304                                 /*
1305                                  * The show must go on: exit, but mark the
1306                                  * stateid as needing recovery.
1307                                  */
1308                         case -NFS4ERR_ADMIN_REVOKED:
1309                         case -NFS4ERR_BAD_STATEID:
1310                                 nfs4_schedule_stateid_recovery(server, state);
1311                         case -EKEYEXPIRED:
1312                                 /*
1313                                  * User RPCSEC_GSS context has expired.
1314                                  * We cannot recover this stateid now, so
1315                                  * skip it and allow recovery thread to
1316                                  * proceed.
1317                                  */
1318                         case -ENOMEM:
1319                                 err = 0;
1320                                 goto out;
1321                 }
1322                 err = nfs4_handle_exception(server, err, &exception);
1323         } while (exception.retry);
1324 out:
1325         return err;
1326 }
1327
1328 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1329 {
1330         struct nfs4_opendata *data = calldata;
1331
1332         data->rpc_status = task->tk_status;
1333         if (data->rpc_status == 0) {
1334                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1335                                 sizeof(data->o_res.stateid.data));
1336                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1337                 renew_lease(data->o_res.server, data->timestamp);
1338                 data->rpc_done = 1;
1339         }
1340 }
1341
1342 static void nfs4_open_confirm_release(void *calldata)
1343 {
1344         struct nfs4_opendata *data = calldata;
1345         struct nfs4_state *state = NULL;
1346
1347         /* If this request hasn't been cancelled, do nothing */
1348         if (data->cancelled == 0)
1349                 goto out_free;
1350         /* In case of error, no cleanup! */
1351         if (!data->rpc_done)
1352                 goto out_free;
1353         state = nfs4_opendata_to_nfs4_state(data);
1354         if (!IS_ERR(state))
1355                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1356 out_free:
1357         nfs4_opendata_put(data);
1358 }
1359
1360 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1361         .rpc_call_done = nfs4_open_confirm_done,
1362         .rpc_release = nfs4_open_confirm_release,
1363 };
1364
1365 /*
1366  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1367  */
1368 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1369 {
1370         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1371         struct rpc_task *task;
1372         struct  rpc_message msg = {
1373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1374                 .rpc_argp = &data->c_arg,
1375                 .rpc_resp = &data->c_res,
1376                 .rpc_cred = data->owner->so_cred,
1377         };
1378         struct rpc_task_setup task_setup_data = {
1379                 .rpc_client = server->client,
1380                 .rpc_message = &msg,
1381                 .callback_ops = &nfs4_open_confirm_ops,
1382                 .callback_data = data,
1383                 .workqueue = nfsiod_workqueue,
1384                 .flags = RPC_TASK_ASYNC,
1385         };
1386         int status;
1387
1388         kref_get(&data->kref);
1389         data->rpc_done = 0;
1390         data->rpc_status = 0;
1391         data->timestamp = jiffies;
1392         task = rpc_run_task(&task_setup_data);
1393         if (IS_ERR(task))
1394                 return PTR_ERR(task);
1395         status = nfs4_wait_for_completion_rpc_task(task);
1396         if (status != 0) {
1397                 data->cancelled = 1;
1398                 smp_wmb();
1399         } else
1400                 status = data->rpc_status;
1401         rpc_put_task(task);
1402         return status;
1403 }
1404
1405 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1406 {
1407         struct nfs4_opendata *data = calldata;
1408         struct nfs4_state_owner *sp = data->owner;
1409
1410         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1411                 return;
1412         /*
1413          * Check if we still need to send an OPEN call, or if we can use
1414          * a delegation instead.
1415          */
1416         if (data->state != NULL) {
1417                 struct nfs_delegation *delegation;
1418
1419                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1420                         goto out_no_action;
1421                 rcu_read_lock();
1422                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1423                 if (delegation != NULL &&
1424                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1425                         rcu_read_unlock();
1426                         goto out_no_action;
1427                 }
1428                 rcu_read_unlock();
1429         }
1430         /* Update sequence id. */
1431         data->o_arg.id = sp->so_owner_id.id;
1432         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1433         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1434                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1435                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1436         }
1437         data->timestamp = jiffies;
1438         if (nfs4_setup_sequence(data->o_arg.server,
1439                                 &data->o_arg.seq_args,
1440                                 &data->o_res.seq_res, 1, task))
1441                 return;
1442         rpc_call_start(task);
1443         return;
1444 out_no_action:
1445         task->tk_action = NULL;
1446
1447 }
1448
1449 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1450 {
1451         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1452         nfs4_open_prepare(task, calldata);
1453 }
1454
1455 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1456 {
1457         struct nfs4_opendata *data = calldata;
1458
1459         data->rpc_status = task->tk_status;
1460
1461         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1462                 return;
1463
1464         if (task->tk_status == 0) {
1465                 switch (data->o_res.f_attr->mode & S_IFMT) {
1466                         case S_IFREG:
1467                                 break;
1468                         case S_IFLNK:
1469                                 data->rpc_status = -ELOOP;
1470                                 break;
1471                         case S_IFDIR:
1472                                 data->rpc_status = -EISDIR;
1473                                 break;
1474                         default:
1475                                 data->rpc_status = -ENOTDIR;
1476                 }
1477                 renew_lease(data->o_res.server, data->timestamp);
1478                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1479                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1480         }
1481         data->rpc_done = 1;
1482 }
1483
1484 static void nfs4_open_release(void *calldata)
1485 {
1486         struct nfs4_opendata *data = calldata;
1487         struct nfs4_state *state = NULL;
1488
1489         /* If this request hasn't been cancelled, do nothing */
1490         if (data->cancelled == 0)
1491                 goto out_free;
1492         /* In case of error, no cleanup! */
1493         if (data->rpc_status != 0 || !data->rpc_done)
1494                 goto out_free;
1495         /* In case we need an open_confirm, no cleanup! */
1496         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1497                 goto out_free;
1498         state = nfs4_opendata_to_nfs4_state(data);
1499         if (!IS_ERR(state))
1500                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1501 out_free:
1502         nfs4_opendata_put(data);
1503 }
1504
1505 static const struct rpc_call_ops nfs4_open_ops = {
1506         .rpc_call_prepare = nfs4_open_prepare,
1507         .rpc_call_done = nfs4_open_done,
1508         .rpc_release = nfs4_open_release,
1509 };
1510
1511 static const struct rpc_call_ops nfs4_recover_open_ops = {
1512         .rpc_call_prepare = nfs4_recover_open_prepare,
1513         .rpc_call_done = nfs4_open_done,
1514         .rpc_release = nfs4_open_release,
1515 };
1516
1517 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1518 {
1519         struct inode *dir = data->dir->d_inode;
1520         struct nfs_server *server = NFS_SERVER(dir);
1521         struct nfs_openargs *o_arg = &data->o_arg;
1522         struct nfs_openres *o_res = &data->o_res;
1523         struct rpc_task *task;
1524         struct rpc_message msg = {
1525                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1526                 .rpc_argp = o_arg,
1527                 .rpc_resp = o_res,
1528                 .rpc_cred = data->owner->so_cred,
1529         };
1530         struct rpc_task_setup task_setup_data = {
1531                 .rpc_client = server->client,
1532                 .rpc_message = &msg,
1533                 .callback_ops = &nfs4_open_ops,
1534                 .callback_data = data,
1535                 .workqueue = nfsiod_workqueue,
1536                 .flags = RPC_TASK_ASYNC,
1537         };
1538         int status;
1539
1540         kref_get(&data->kref);
1541         data->rpc_done = 0;
1542         data->rpc_status = 0;
1543         data->cancelled = 0;
1544         if (isrecover)
1545                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1546         task = rpc_run_task(&task_setup_data);
1547         if (IS_ERR(task))
1548                 return PTR_ERR(task);
1549         status = nfs4_wait_for_completion_rpc_task(task);
1550         if (status != 0) {
1551                 data->cancelled = 1;
1552                 smp_wmb();
1553         } else
1554                 status = data->rpc_status;
1555         rpc_put_task(task);
1556
1557         return status;
1558 }
1559
1560 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1561 {
1562         struct inode *dir = data->dir->d_inode;
1563         struct nfs_openres *o_res = &data->o_res;
1564         int status;
1565
1566         status = nfs4_run_open_task(data, 1);
1567         if (status != 0 || !data->rpc_done)
1568                 return status;
1569
1570         nfs_refresh_inode(dir, o_res->dir_attr);
1571
1572         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1573                 status = _nfs4_proc_open_confirm(data);
1574                 if (status != 0)
1575                         return status;
1576         }
1577
1578         return status;
1579 }
1580
1581 /*
1582  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1583  */
1584 static int _nfs4_proc_open(struct nfs4_opendata *data)
1585 {
1586         struct inode *dir = data->dir->d_inode;
1587         struct nfs_server *server = NFS_SERVER(dir);
1588         struct nfs_openargs *o_arg = &data->o_arg;
1589         struct nfs_openres *o_res = &data->o_res;
1590         int status;
1591
1592         status = nfs4_run_open_task(data, 0);
1593         if (status != 0 || !data->rpc_done)
1594                 return status;
1595
1596         if (o_arg->open_flags & O_CREAT) {
1597                 update_changeattr(dir, &o_res->cinfo);
1598                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1599         } else
1600                 nfs_refresh_inode(dir, o_res->dir_attr);
1601         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1602                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1603         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1604                 status = _nfs4_proc_open_confirm(data);
1605                 if (status != 0)
1606                         return status;
1607         }
1608         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1609                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1610         return 0;
1611 }
1612
1613 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1614 {
1615         unsigned int loop;
1616         int ret;
1617
1618         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1619                 ret = nfs4_wait_clnt_recover(clp);
1620                 if (ret != 0)
1621                         break;
1622                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1623                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1624                         break;
1625                 nfs4_schedule_state_manager(clp);
1626                 ret = -EIO;
1627         }
1628         return ret;
1629 }
1630
1631 static int nfs4_recover_expired_lease(struct nfs_server *server)
1632 {
1633         return nfs4_client_recover_expired_lease(server->nfs_client);
1634 }
1635
1636 /*
1637  * OPEN_EXPIRED:
1638  *      reclaim state on the server after a network partition.
1639  *      Assumes caller holds the appropriate lock
1640  */
1641 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1642 {
1643         struct nfs4_opendata *opendata;
1644         int ret;
1645
1646         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1647         if (IS_ERR(opendata))
1648                 return PTR_ERR(opendata);
1649         ret = nfs4_open_recover(opendata, state);
1650         if (ret == -ESTALE)
1651                 d_drop(ctx->path.dentry);
1652         nfs4_opendata_put(opendata);
1653         return ret;
1654 }
1655
1656 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1657 {
1658         struct nfs_server *server = NFS_SERVER(state->inode);
1659         struct nfs4_exception exception = { };
1660         int err;
1661
1662         do {
1663                 err = _nfs4_open_expired(ctx, state);
1664                 switch (err) {
1665                 default:
1666                         goto out;
1667                 case -NFS4ERR_GRACE:
1668                 case -NFS4ERR_DELAY:
1669                         nfs4_handle_exception(server, err, &exception);
1670                         err = 0;
1671                 }
1672         } while (exception.retry);
1673 out:
1674         return err;
1675 }
1676
1677 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1678 {
1679         struct nfs_open_context *ctx;
1680         int ret;
1681
1682         ctx = nfs4_state_find_open_context(state);
1683         if (IS_ERR(ctx))
1684                 return PTR_ERR(ctx);
1685         ret = nfs4_do_open_expired(ctx, state);
1686         put_nfs_open_context(ctx);
1687         return ret;
1688 }
1689
1690 /*
1691  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1692  * fields corresponding to attributes that were used to store the verifier.
1693  * Make sure we clobber those fields in the later setattr call
1694  */
1695 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1696 {
1697         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1698             !(sattr->ia_valid & ATTR_ATIME_SET))
1699                 sattr->ia_valid |= ATTR_ATIME;
1700
1701         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1702             !(sattr->ia_valid & ATTR_MTIME_SET))
1703                 sattr->ia_valid |= ATTR_MTIME;
1704 }
1705
1706 /*
1707  * Returns a referenced nfs4_state
1708  */
1709 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1710 {
1711         struct nfs4_state_owner  *sp;
1712         struct nfs4_state     *state = NULL;
1713         struct nfs_server       *server = NFS_SERVER(dir);
1714         struct nfs4_opendata *opendata;
1715         int status;
1716
1717         /* Protect against reboot recovery conflicts */
1718         status = -ENOMEM;
1719         if (!(sp = nfs4_get_state_owner(server, cred))) {
1720                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1721                 goto out_err;
1722         }
1723         status = nfs4_recover_expired_lease(server);
1724         if (status != 0)
1725                 goto err_put_state_owner;
1726         if (path->dentry->d_inode != NULL)
1727                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1728         status = -ENOMEM;
1729         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1730         if (opendata == NULL)
1731                 goto err_put_state_owner;
1732
1733         if (path->dentry->d_inode != NULL)
1734                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1735
1736         status = _nfs4_proc_open(opendata);
1737         if (status != 0)
1738                 goto err_opendata_put;
1739
1740         state = nfs4_opendata_to_nfs4_state(opendata);
1741         status = PTR_ERR(state);
1742         if (IS_ERR(state))
1743                 goto err_opendata_put;
1744         if (server->caps & NFS_CAP_POSIX_LOCK)
1745                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1746
1747         if (opendata->o_arg.open_flags & O_EXCL) {
1748                 nfs4_exclusive_attrset(opendata, sattr);
1749
1750                 nfs_fattr_init(opendata->o_res.f_attr);
1751                 status = nfs4_do_setattr(state->inode, cred,
1752                                 opendata->o_res.f_attr, sattr,
1753                                 state);
1754                 if (status == 0)
1755                         nfs_setattr_update_inode(state->inode, sattr);
1756                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1757         }
1758         nfs4_opendata_put(opendata);
1759         nfs4_put_state_owner(sp);
1760         *res = state;
1761         return 0;
1762 err_opendata_put:
1763         nfs4_opendata_put(opendata);
1764 err_put_state_owner:
1765         nfs4_put_state_owner(sp);
1766 out_err:
1767         *res = NULL;
1768         return status;
1769 }
1770
1771
1772 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1773 {
1774         struct nfs4_exception exception = { };
1775         struct nfs4_state *res;
1776         int status;
1777
1778         do {
1779                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1780                 if (status == 0)
1781                         break;
1782                 /* NOTE: BAD_SEQID means the server and client disagree about the
1783                  * book-keeping w.r.t. state-changing operations
1784                  * (OPEN/CLOSE/LOCK/LOCKU...)
1785                  * It is actually a sign of a bug on the client or on the server.
1786                  *
1787                  * If we receive a BAD_SEQID error in the particular case of
1788                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1789                  * have unhashed the old state_owner for us, and that we can
1790                  * therefore safely retry using a new one. We should still warn
1791                  * the user though...
1792                  */
1793                 if (status == -NFS4ERR_BAD_SEQID) {
1794                         printk(KERN_WARNING "NFS: v4 server %s "
1795                                         " returned a bad sequence-id error!\n",
1796                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1797                         exception.retry = 1;
1798                         continue;
1799                 }
1800                 /*
1801                  * BAD_STATEID on OPEN means that the server cancelled our
1802                  * state before it received the OPEN_CONFIRM.
1803                  * Recover by retrying the request as per the discussion
1804                  * on Page 181 of RFC3530.
1805                  */
1806                 if (status == -NFS4ERR_BAD_STATEID) {
1807                         exception.retry = 1;
1808                         continue;
1809                 }
1810                 if (status == -EAGAIN) {
1811                         /* We must have found a delegation */
1812                         exception.retry = 1;
1813                         continue;
1814                 }
1815                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1816                                         status, &exception));
1817         } while (exception.retry);
1818         return res;
1819 }
1820
1821 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1822                             struct nfs_fattr *fattr, struct iattr *sattr,
1823                             struct nfs4_state *state)
1824 {
1825         struct nfs_server *server = NFS_SERVER(inode);
1826         struct nfs_setattrargs  arg = {
1827                 .fh             = NFS_FH(inode),
1828                 .iap            = sattr,
1829                 .server         = server,
1830                 .bitmask = server->attr_bitmask,
1831         };
1832         struct nfs_setattrres  res = {
1833                 .fattr          = fattr,
1834                 .server         = server,
1835         };
1836         struct rpc_message msg = {
1837                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1838                 .rpc_argp       = &arg,
1839                 .rpc_resp       = &res,
1840                 .rpc_cred       = cred,
1841         };
1842         unsigned long timestamp = jiffies;
1843         int status;
1844
1845         nfs_fattr_init(fattr);
1846
1847         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1848                 /* Use that stateid */
1849         } else if (state != NULL) {
1850                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1851         } else
1852                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1853
1854         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1855         if (status == 0 && state != NULL)
1856                 renew_lease(server, timestamp);
1857         return status;
1858 }
1859
1860 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1861                            struct nfs_fattr *fattr, struct iattr *sattr,
1862                            struct nfs4_state *state)
1863 {
1864         struct nfs_server *server = NFS_SERVER(inode);
1865         struct nfs4_exception exception = { };
1866         int err;
1867         do {
1868                 err = nfs4_handle_exception(server,
1869                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1870                                 &exception);
1871         } while (exception.retry);
1872         return err;
1873 }
1874
1875 struct nfs4_closedata {
1876         struct path path;
1877         struct inode *inode;
1878         struct nfs4_state *state;
1879         struct nfs_closeargs arg;
1880         struct nfs_closeres res;
1881         struct nfs_fattr fattr;
1882         unsigned long timestamp;
1883         bool roc;
1884         u32 roc_barrier;
1885 };
1886
1887 static void nfs4_free_closedata(void *data)
1888 {
1889         struct nfs4_closedata *calldata = data;
1890         struct nfs4_state_owner *sp = calldata->state->owner;
1891
1892         if (calldata->roc)
1893                 pnfs_roc_release(calldata->state->inode);
1894         nfs4_put_open_state(calldata->state);
1895         nfs_free_seqid(calldata->arg.seqid);
1896         nfs4_put_state_owner(sp);
1897         path_put(&calldata->path);
1898         kfree(calldata);
1899 }
1900
1901 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1902                 fmode_t fmode)
1903 {
1904         spin_lock(&state->owner->so_lock);
1905         if (!(fmode & FMODE_READ))
1906                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1907         if (!(fmode & FMODE_WRITE))
1908                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1909         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1910         spin_unlock(&state->owner->so_lock);
1911 }
1912
1913 static void nfs4_close_done(struct rpc_task *task, void *data)
1914 {
1915         struct nfs4_closedata *calldata = data;
1916         struct nfs4_state *state = calldata->state;
1917         struct nfs_server *server = NFS_SERVER(calldata->inode);
1918
1919         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1920                 return;
1921         /* hmm. we are done with the inode, and in the process of freeing
1922          * the state_owner. we keep this around to process errors
1923          */
1924         switch (task->tk_status) {
1925                 case 0:
1926                         if (calldata->roc)
1927                                 pnfs_roc_set_barrier(state->inode,
1928                                                      calldata->roc_barrier);
1929                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1930                         renew_lease(server, calldata->timestamp);
1931                         nfs4_close_clear_stateid_flags(state,
1932                                         calldata->arg.fmode);
1933                         break;
1934                 case -NFS4ERR_STALE_STATEID:
1935                 case -NFS4ERR_OLD_STATEID:
1936                 case -NFS4ERR_BAD_STATEID:
1937                 case -NFS4ERR_EXPIRED:
1938                         if (calldata->arg.fmode == 0)
1939                                 break;
1940                 default:
1941                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1942                                 rpc_restart_call_prepare(task);
1943         }
1944         nfs_release_seqid(calldata->arg.seqid);
1945         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1946 }
1947
1948 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1949 {
1950         struct nfs4_closedata *calldata = data;
1951         struct nfs4_state *state = calldata->state;
1952         int call_close = 0;
1953
1954         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1955                 return;
1956
1957         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1958         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1959         spin_lock(&state->owner->so_lock);
1960         /* Calculate the change in open mode */
1961         if (state->n_rdwr == 0) {
1962                 if (state->n_rdonly == 0) {
1963                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1964                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1965                         calldata->arg.fmode &= ~FMODE_READ;
1966                 }
1967                 if (state->n_wronly == 0) {
1968                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1969                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1970                         calldata->arg.fmode &= ~FMODE_WRITE;
1971                 }
1972         }
1973         spin_unlock(&state->owner->so_lock);
1974
1975         if (!call_close) {
1976                 /* Note: exit _without_ calling nfs4_close_done */
1977                 task->tk_action = NULL;
1978                 return;
1979         }
1980
1981         if (calldata->arg.fmode == 0) {
1982                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1983                 if (calldata->roc &&
1984                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1985                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1986                                      task, NULL);
1987                         return;
1988                 }
1989         }
1990
1991         nfs_fattr_init(calldata->res.fattr);
1992         calldata->timestamp = jiffies;
1993         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1994                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1995                                 1, task))
1996                 return;
1997         rpc_call_start(task);
1998 }
1999
2000 static const struct rpc_call_ops nfs4_close_ops = {
2001         .rpc_call_prepare = nfs4_close_prepare,
2002         .rpc_call_done = nfs4_close_done,
2003         .rpc_release = nfs4_free_closedata,
2004 };
2005
2006 /*
2007  * It is possible for data to be read/written from a mem-mapped file
2008  * after the sys_close call (which hits the vfs layer as a flush).
2009  * This means that we can't safely call nfsv4 close on a file until
2010  * the inode is cleared. This in turn means that we are not good
2011  * NFSv4 citizens - we do not indicate to the server to update the file's
2012  * share state even when we are done with one of the three share
2013  * stateid's in the inode.
2014  *
2015  * NOTE: Caller must be holding the sp->so_owner semaphore!
2016  */
2017 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2018 {
2019         struct nfs_server *server = NFS_SERVER(state->inode);
2020         struct nfs4_closedata *calldata;
2021         struct nfs4_state_owner *sp = state->owner;
2022         struct rpc_task *task;
2023         struct rpc_message msg = {
2024                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2025                 .rpc_cred = state->owner->so_cred,
2026         };
2027         struct rpc_task_setup task_setup_data = {
2028                 .rpc_client = server->client,
2029                 .rpc_message = &msg,
2030                 .callback_ops = &nfs4_close_ops,
2031                 .workqueue = nfsiod_workqueue,
2032                 .flags = RPC_TASK_ASYNC,
2033         };
2034         int status = -ENOMEM;
2035
2036         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2037         if (calldata == NULL)
2038                 goto out;
2039         calldata->inode = state->inode;
2040         calldata->state = state;
2041         calldata->arg.fh = NFS_FH(state->inode);
2042         calldata->arg.stateid = &state->open_stateid;
2043         /* Serialization for the sequence id */
2044         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2045         if (calldata->arg.seqid == NULL)
2046                 goto out_free_calldata;
2047         calldata->arg.fmode = 0;
2048         calldata->arg.bitmask = server->cache_consistency_bitmask;
2049         calldata->res.fattr = &calldata->fattr;
2050         calldata->res.seqid = calldata->arg.seqid;
2051         calldata->res.server = server;
2052         calldata->roc = roc;
2053         path_get(path);
2054         calldata->path = *path;
2055
2056         msg.rpc_argp = &calldata->arg;
2057         msg.rpc_resp = &calldata->res;
2058         task_setup_data.callback_data = calldata;
2059         task = rpc_run_task(&task_setup_data);
2060         if (IS_ERR(task))
2061                 return PTR_ERR(task);
2062         status = 0;
2063         if (wait)
2064                 status = rpc_wait_for_completion_task(task);
2065         rpc_put_task(task);
2066         return status;
2067 out_free_calldata:
2068         kfree(calldata);
2069 out:
2070         if (roc)
2071                 pnfs_roc_release(state->inode);
2072         nfs4_put_open_state(state);
2073         nfs4_put_state_owner(sp);
2074         return status;
2075 }
2076
2077 static struct inode *
2078 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2079 {
2080         struct nfs4_state *state;
2081
2082         /* Protect against concurrent sillydeletes */
2083         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2084         if (IS_ERR(state))
2085                 return ERR_CAST(state);
2086         ctx->state = state;
2087         return igrab(state->inode);
2088 }
2089
2090 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2091 {
2092         if (ctx->state == NULL)
2093                 return;
2094         if (is_sync)
2095                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2096         else
2097                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2098 }
2099
2100 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2101 {
2102         struct nfs4_server_caps_arg args = {
2103                 .fhandle = fhandle,
2104         };
2105         struct nfs4_server_caps_res res = {};
2106         struct rpc_message msg = {
2107                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2108                 .rpc_argp = &args,
2109                 .rpc_resp = &res,
2110         };
2111         int status;
2112
2113         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2114         if (status == 0) {
2115                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2116                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2117                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2118                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2119                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2120                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2121                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2122                         server->caps |= NFS_CAP_ACLS;
2123                 if (res.has_links != 0)
2124                         server->caps |= NFS_CAP_HARDLINKS;
2125                 if (res.has_symlinks != 0)
2126                         server->caps |= NFS_CAP_SYMLINKS;
2127                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2128                         server->caps |= NFS_CAP_FILEID;
2129                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2130                         server->caps |= NFS_CAP_MODE;
2131                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2132                         server->caps |= NFS_CAP_NLINK;
2133                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2134                         server->caps |= NFS_CAP_OWNER;
2135                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2136                         server->caps |= NFS_CAP_OWNER_GROUP;
2137                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2138                         server->caps |= NFS_CAP_ATIME;
2139                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2140                         server->caps |= NFS_CAP_CTIME;
2141                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2142                         server->caps |= NFS_CAP_MTIME;
2143
2144                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2145                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2146                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2147                 server->acl_bitmask = res.acl_bitmask;
2148         }
2149
2150         return status;
2151 }
2152
2153 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2154 {
2155         struct nfs4_exception exception = { };
2156         int err;
2157         do {
2158                 err = nfs4_handle_exception(server,
2159                                 _nfs4_server_capabilities(server, fhandle),
2160                                 &exception);
2161         } while (exception.retry);
2162         return err;
2163 }
2164
2165 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2166                 struct nfs_fsinfo *info)
2167 {
2168         struct nfs4_lookup_root_arg args = {
2169                 .bitmask = nfs4_fattr_bitmap,
2170         };
2171         struct nfs4_lookup_res res = {
2172                 .server = server,
2173                 .fattr = info->fattr,
2174                 .fh = fhandle,
2175         };
2176         struct rpc_message msg = {
2177                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2178                 .rpc_argp = &args,
2179                 .rpc_resp = &res,
2180         };
2181
2182         nfs_fattr_init(info->fattr);
2183         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2184 }
2185
2186 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2187                 struct nfs_fsinfo *info)
2188 {
2189         struct nfs4_exception exception = { };
2190         int err;
2191         do {
2192                 err = _nfs4_lookup_root(server, fhandle, info);
2193                 switch (err) {
2194                 case 0:
2195                 case -NFS4ERR_WRONGSEC:
2196                         break;
2197                 default:
2198                         err = nfs4_handle_exception(server, err, &exception);
2199                 }
2200         } while (exception.retry);
2201         return err;
2202 }
2203
2204 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2205                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2206 {
2207         struct rpc_auth *auth;
2208         int ret;
2209
2210         auth = rpcauth_create(flavor, server->client);
2211         if (!auth) {
2212                 ret = -EIO;
2213                 goto out;
2214         }
2215         ret = nfs4_lookup_root(server, fhandle, info);
2216 out:
2217         return ret;
2218 }
2219
2220 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2221                               struct nfs_fsinfo *info)
2222 {
2223         int i, len, status = 0;
2224         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2225
2226         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2227         flav_array[len] = RPC_AUTH_NULL;
2228         len += 1;
2229
2230         for (i = 0; i < len; i++) {
2231                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2232                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2233                         continue;
2234                 break;
2235         }
2236         /*
2237          * -EACCESS could mean that the user doesn't have correct permissions
2238          * to access the mount.  It could also mean that we tried to mount
2239          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2240          * existing mount programs don't handle -EACCES very well so it should
2241          * be mapped to -EPERM instead.
2242          */
2243         if (status == -EACCES)
2244                 status = -EPERM;
2245         return status;
2246 }
2247
2248 /*
2249  * get the file handle for the "/" directory on the server
2250  */
2251 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2252                               struct nfs_fsinfo *info)
2253 {
2254         int status = nfs4_lookup_root(server, fhandle, info);
2255         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2256                 /*
2257                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2258                  * by nfs4_map_errors() as this function exits.
2259                  */
2260                 status = nfs4_find_root_sec(server, fhandle, info);
2261         if (status == 0)
2262                 status = nfs4_server_capabilities(server, fhandle);
2263         if (status == 0)
2264                 status = nfs4_do_fsinfo(server, fhandle, info);
2265         return nfs4_map_errors(status);
2266 }
2267
2268 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2269 /*
2270  * Get locations and (maybe) other attributes of a referral.
2271  * Note that we'll actually follow the referral later when
2272  * we detect fsid mismatch in inode revalidation
2273  */
2274 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2275                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2276 {
2277         int status = -ENOMEM;
2278         struct page *page = NULL;
2279         struct nfs4_fs_locations *locations = NULL;
2280
2281         page = alloc_page(GFP_KERNEL);
2282         if (page == NULL)
2283                 goto out;
2284         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2285         if (locations == NULL)
2286                 goto out;
2287
2288         status = nfs4_proc_fs_locations(dir, name, locations, page);
2289         if (status != 0)
2290                 goto out;
2291         /* Make sure server returned a different fsid for the referral */
2292         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2293                 dprintk("%s: server did not return a different fsid for"
2294                         " a referral at %s\n", __func__, name->name);
2295                 status = -EIO;
2296                 goto out;
2297         }
2298         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2299         nfs_fixup_referral_attributes(&locations->fattr);
2300
2301         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2302         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2303         memset(fhandle, 0, sizeof(struct nfs_fh));
2304 out:
2305         if (page)
2306                 __free_page(page);
2307         kfree(locations);
2308         return status;
2309 }
2310
2311 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2312 {
2313         struct nfs4_getattr_arg args = {
2314                 .fh = fhandle,
2315                 .bitmask = server->attr_bitmask,
2316         };
2317         struct nfs4_getattr_res res = {
2318                 .fattr = fattr,
2319                 .server = server,
2320         };
2321         struct rpc_message msg = {
2322                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2323                 .rpc_argp = &args,
2324                 .rpc_resp = &res,
2325         };
2326
2327         nfs_fattr_init(fattr);
2328         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2329 }
2330
2331 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2332 {
2333         struct nfs4_exception exception = { };
2334         int err;
2335         do {
2336                 err = nfs4_handle_exception(server,
2337                                 _nfs4_proc_getattr(server, fhandle, fattr),
2338                                 &exception);
2339         } while (exception.retry);
2340         return err;
2341 }
2342
2343 /*
2344  * The file is not closed if it is opened due to the a request to change
2345  * the size of the file. The open call will not be needed once the
2346  * VFS layer lookup-intents are implemented.
2347  *
2348  * Close is called when the inode is destroyed.
2349  * If we haven't opened the file for O_WRONLY, we
2350  * need to in the size_change case to obtain a stateid.
2351  *
2352  * Got race?
2353  * Because OPEN is always done by name in nfsv4, it is
2354  * possible that we opened a different file by the same
2355  * name.  We can recognize this race condition, but we
2356  * can't do anything about it besides returning an error.
2357  *
2358  * This will be fixed with VFS changes (lookup-intent).
2359  */
2360 static int
2361 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2362                   struct iattr *sattr)
2363 {
2364         struct inode *inode = dentry->d_inode;
2365         struct rpc_cred *cred = NULL;
2366         struct nfs4_state *state = NULL;
2367         int status;
2368
2369         if (pnfs_ld_layoutret_on_setattr(inode))
2370                 pnfs_return_layout(inode);
2371
2372         nfs_fattr_init(fattr);
2373
2374         /* Search for an existing open(O_WRITE) file */
2375         if (sattr->ia_valid & ATTR_FILE) {
2376                 struct nfs_open_context *ctx;
2377
2378                 ctx = nfs_file_open_context(sattr->ia_file);
2379                 if (ctx) {
2380                         cred = ctx->cred;
2381                         state = ctx->state;
2382                 }
2383         }
2384
2385         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2386         if (status == 0)
2387                 nfs_setattr_update_inode(inode, sattr);
2388         return status;
2389 }
2390
2391 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2392                 const struct nfs_fh *dirfh, const struct qstr *name,
2393                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2394 {
2395         int                    status;
2396         struct nfs4_lookup_arg args = {
2397                 .bitmask = server->attr_bitmask,
2398                 .dir_fh = dirfh,
2399                 .name = name,
2400         };
2401         struct nfs4_lookup_res res = {
2402                 .server = server,
2403                 .fattr = fattr,
2404                 .fh = fhandle,
2405         };
2406         struct rpc_message msg = {
2407                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2408                 .rpc_argp = &args,
2409                 .rpc_resp = &res,
2410         };
2411
2412         nfs_fattr_init(fattr);
2413
2414         dprintk("NFS call  lookupfh %s\n", name->name);
2415         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2416         dprintk("NFS reply lookupfh: %d\n", status);
2417         return status;
2418 }
2419
2420 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2421                               struct qstr *name, struct nfs_fh *fhandle,
2422                               struct nfs_fattr *fattr)
2423 {
2424         struct nfs4_exception exception = { };
2425         int err;
2426         do {
2427                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2428                 /* FIXME: !!!! */
2429                 if (err == -NFS4ERR_MOVED) {
2430                         err = -EREMOTE;
2431                         break;
2432                 }
2433                 err = nfs4_handle_exception(server, err, &exception);
2434         } while (exception.retry);
2435         return err;
2436 }
2437
2438 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2439                 const struct qstr *name, struct nfs_fh *fhandle,
2440                 struct nfs_fattr *fattr)
2441 {
2442         int status;
2443
2444         dprintk("NFS call  lookup %s\n", name->name);
2445         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2446         if (status == -NFS4ERR_MOVED)
2447                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2448         dprintk("NFS reply lookup: %d\n", status);
2449         return status;
2450 }
2451
2452 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2453 {
2454         memset(fh, 0, sizeof(struct nfs_fh));
2455         fattr->fsid.major = 1;
2456         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2457                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2458         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2459         fattr->nlink = 2;
2460 }
2461
2462 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2463                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2464 {
2465         struct nfs4_exception exception = { };
2466         int err;
2467         do {
2468                 err = nfs4_handle_exception(NFS_SERVER(dir),
2469                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2470                                 &exception);
2471                 if (err == -EPERM)
2472                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2473         } while (exception.retry);
2474         return err;
2475 }
2476
2477 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2478 {
2479         struct nfs_server *server = NFS_SERVER(inode);
2480         struct nfs4_accessargs args = {
2481                 .fh = NFS_FH(inode),
2482                 .bitmask = server->attr_bitmask,
2483         };
2484         struct nfs4_accessres res = {
2485                 .server = server,
2486         };
2487         struct rpc_message msg = {
2488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2489                 .rpc_argp = &args,
2490                 .rpc_resp = &res,
2491                 .rpc_cred = entry->cred,
2492         };
2493         int mode = entry->mask;
2494         int status;
2495
2496         /*
2497          * Determine which access bits we want to ask for...
2498          */
2499         if (mode & MAY_READ)
2500                 args.access |= NFS4_ACCESS_READ;
2501         if (S_ISDIR(inode->i_mode)) {
2502                 if (mode & MAY_WRITE)
2503                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2504                 if (mode & MAY_EXEC)
2505                         args.access |= NFS4_ACCESS_LOOKUP;
2506         } else {
2507                 if (mode & MAY_WRITE)
2508                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2509                 if (mode & MAY_EXEC)
2510                         args.access |= NFS4_ACCESS_EXECUTE;
2511         }
2512
2513         res.fattr = nfs_alloc_fattr();
2514         if (res.fattr == NULL)
2515                 return -ENOMEM;
2516
2517         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2518         if (!status) {
2519                 entry->mask = 0;
2520                 if (res.access & NFS4_ACCESS_READ)
2521                         entry->mask |= MAY_READ;
2522                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2523                         entry->mask |= MAY_WRITE;
2524                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2525                         entry->mask |= MAY_EXEC;
2526                 nfs_refresh_inode(inode, res.fattr);
2527         }
2528         nfs_free_fattr(res.fattr);
2529         return status;
2530 }
2531
2532 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2533 {
2534         struct nfs4_exception exception = { };
2535         int err;
2536         do {
2537                 err = nfs4_handle_exception(NFS_SERVER(inode),
2538                                 _nfs4_proc_access(inode, entry),
2539                                 &exception);
2540         } while (exception.retry);
2541         return err;
2542 }
2543
2544 /*
2545  * TODO: For the time being, we don't try to get any attributes
2546  * along with any of the zero-copy operations READ, READDIR,
2547  * READLINK, WRITE.
2548  *
2549  * In the case of the first three, we want to put the GETATTR
2550  * after the read-type operation -- this is because it is hard
2551  * to predict the length of a GETATTR response in v4, and thus
2552  * align the READ data correctly.  This means that the GETATTR
2553  * may end up partially falling into the page cache, and we should
2554  * shift it into the 'tail' of the xdr_buf before processing.
2555  * To do this efficiently, we need to know the total length
2556  * of data received, which doesn't seem to be available outside
2557  * of the RPC layer.
2558  *
2559  * In the case of WRITE, we also want to put the GETATTR after
2560  * the operation -- in this case because we want to make sure
2561  * we get the post-operation mtime and size.  This means that
2562  * we can't use xdr_encode_pages() as written: we need a variant
2563  * of it which would leave room in the 'tail' iovec.
2564  *
2565  * Both of these changes to the XDR layer would in fact be quite
2566  * minor, but I decided to leave them for a subsequent patch.
2567  */
2568 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2569                 unsigned int pgbase, unsigned int pglen)
2570 {
2571         struct nfs4_readlink args = {
2572                 .fh       = NFS_FH(inode),
2573                 .pgbase   = pgbase,
2574                 .pglen    = pglen,
2575                 .pages    = &page,
2576         };
2577         struct nfs4_readlink_res res;
2578         struct rpc_message msg = {
2579                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2580                 .rpc_argp = &args,
2581                 .rpc_resp = &res,
2582         };
2583
2584         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2585 }
2586
2587 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2588                 unsigned int pgbase, unsigned int pglen)
2589 {
2590         struct nfs4_exception exception = { };
2591         int err;
2592         do {
2593                 err = nfs4_handle_exception(NFS_SERVER(inode),
2594                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2595                                 &exception);
2596         } while (exception.retry);
2597         return err;
2598 }
2599
2600 /*
2601  * Got race?
2602  * We will need to arrange for the VFS layer to provide an atomic open.
2603  * Until then, this create/open method is prone to inefficiency and race
2604  * conditions due to the lookup, create, and open VFS calls from sys_open()
2605  * placed on the wire.
2606  *
2607  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2608  * The file will be opened again in the subsequent VFS open call
2609  * (nfs4_proc_file_open).
2610  *
2611  * The open for read will just hang around to be used by any process that
2612  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2613  */
2614
2615 static int
2616 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2617                  int flags, struct nfs_open_context *ctx)
2618 {
2619         struct path my_path = {
2620                 .dentry = dentry,
2621         };
2622         struct path *path = &my_path;
2623         struct nfs4_state *state;
2624         struct rpc_cred *cred = NULL;
2625         fmode_t fmode = 0;
2626         int status = 0;
2627
2628         if (ctx != NULL) {
2629                 cred = ctx->cred;
2630                 path = &ctx->path;
2631                 fmode = ctx->mode;
2632         }
2633         sattr->ia_mode &= ~current_umask();
2634         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2635         d_drop(dentry);
2636         if (IS_ERR(state)) {
2637                 status = PTR_ERR(state);
2638                 goto out;
2639         }
2640         d_add(dentry, igrab(state->inode));
2641         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2642         if (ctx != NULL)
2643                 ctx->state = state;
2644         else
2645                 nfs4_close_sync(path, state, fmode);
2646 out:
2647         return status;
2648 }
2649
2650 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2651 {
2652         struct nfs_server *server = NFS_SERVER(dir);
2653         struct nfs_removeargs args = {
2654                 .fh = NFS_FH(dir),
2655                 .name.len = name->len,
2656                 .name.name = name->name,
2657                 .bitmask = server->attr_bitmask,
2658         };
2659         struct nfs_removeres res = {
2660                 .server = server,
2661         };
2662         struct rpc_message msg = {
2663                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2664                 .rpc_argp = &args,
2665                 .rpc_resp = &res,
2666         };
2667         int status = -ENOMEM;
2668
2669         res.dir_attr = nfs_alloc_fattr();
2670         if (res.dir_attr == NULL)
2671                 goto out;
2672
2673         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2674         if (status == 0) {
2675                 update_changeattr(dir, &res.cinfo);
2676                 nfs_post_op_update_inode(dir, res.dir_attr);
2677         }
2678         nfs_free_fattr(res.dir_attr);
2679 out:
2680         return status;
2681 }
2682
2683 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2684 {
2685         struct nfs4_exception exception = { };
2686         int err;
2687         do {
2688                 err = nfs4_handle_exception(NFS_SERVER(dir),
2689                                 _nfs4_proc_remove(dir, name),
2690                                 &exception);
2691         } while (exception.retry);
2692         return err;
2693 }
2694
2695 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2696 {
2697         struct nfs_server *server = NFS_SERVER(dir);
2698         struct nfs_removeargs *args = msg->rpc_argp;
2699         struct nfs_removeres *res = msg->rpc_resp;
2700
2701         args->bitmask = server->cache_consistency_bitmask;
2702         res->server = server;
2703         res->seq_res.sr_slot = NULL;
2704         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2705 }
2706
2707 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2708 {
2709         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2710
2711         if (!nfs4_sequence_done(task, &res->seq_res))
2712                 return 0;
2713         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2714                 return 0;
2715         update_changeattr(dir, &res->cinfo);
2716         nfs_post_op_update_inode(dir, res->dir_attr);
2717         return 1;
2718 }
2719
2720 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2721 {
2722         struct nfs_server *server = NFS_SERVER(dir);
2723         struct nfs_renameargs *arg = msg->rpc_argp;
2724         struct nfs_renameres *res = msg->rpc_resp;
2725
2726         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2727         arg->bitmask = server->attr_bitmask;
2728         res->server = server;
2729 }
2730
2731 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2732                                  struct inode *new_dir)
2733 {
2734         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2735
2736         if (!nfs4_sequence_done(task, &res->seq_res))
2737                 return 0;
2738         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2739                 return 0;
2740
2741         update_changeattr(old_dir, &res->old_cinfo);
2742         nfs_post_op_update_inode(old_dir, res->old_fattr);
2743         update_changeattr(new_dir, &res->new_cinfo);
2744         nfs_post_op_update_inode(new_dir, res->new_fattr);
2745         return 1;
2746 }
2747
2748 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2749                 struct inode *new_dir, struct qstr *new_name)
2750 {
2751         struct nfs_server *server = NFS_SERVER(old_dir);
2752         struct nfs_renameargs arg = {
2753                 .old_dir = NFS_FH(old_dir),
2754                 .new_dir = NFS_FH(new_dir),
2755                 .old_name = old_name,
2756                 .new_name = new_name,
2757                 .bitmask = server->attr_bitmask,
2758         };
2759         struct nfs_renameres res = {
2760                 .server = server,
2761         };
2762         struct rpc_message msg = {
2763                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2764                 .rpc_argp = &arg,
2765                 .rpc_resp = &res,
2766         };
2767         int status = -ENOMEM;
2768
2769         res.old_fattr = nfs_alloc_fattr();
2770         res.new_fattr = nfs_alloc_fattr();
2771         if (res.old_fattr == NULL || res.new_fattr == NULL)
2772                 goto out;
2773
2774         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2775         if (!status) {
2776                 update_changeattr(old_dir, &res.old_cinfo);
2777                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2778                 update_changeattr(new_dir, &res.new_cinfo);
2779                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2780         }
2781 out:
2782         nfs_free_fattr(res.new_fattr);
2783         nfs_free_fattr(res.old_fattr);
2784         return status;
2785 }
2786
2787 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2788                 struct inode *new_dir, struct qstr *new_name)
2789 {
2790         struct nfs4_exception exception = { };
2791         int err;
2792         do {
2793                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2794                                 _nfs4_proc_rename(old_dir, old_name,
2795                                         new_dir, new_name),
2796                                 &exception);
2797         } while (exception.retry);
2798         return err;
2799 }
2800
2801 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2802 {
2803         struct nfs_server *server = NFS_SERVER(inode);
2804         struct nfs4_link_arg arg = {
2805                 .fh     = NFS_FH(inode),
2806                 .dir_fh = NFS_FH(dir),
2807                 .name   = name,
2808                 .bitmask = server->attr_bitmask,
2809         };
2810         struct nfs4_link_res res = {
2811                 .server = server,
2812         };
2813         struct rpc_message msg = {
2814                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2815                 .rpc_argp = &arg,
2816                 .rpc_resp = &res,
2817         };
2818         int status = -ENOMEM;
2819
2820         res.fattr = nfs_alloc_fattr();
2821         res.dir_attr = nfs_alloc_fattr();
2822         if (res.fattr == NULL || res.dir_attr == NULL)
2823                 goto out;
2824
2825         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2826         if (!status) {
2827                 update_changeattr(dir, &res.cinfo);
2828                 nfs_post_op_update_inode(dir, res.dir_attr);
2829                 nfs_post_op_update_inode(inode, res.fattr);
2830         }
2831 out:
2832         nfs_free_fattr(res.dir_attr);
2833         nfs_free_fattr(res.fattr);
2834         return status;
2835 }
2836
2837 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2838 {
2839         struct nfs4_exception exception = { };
2840         int err;
2841         do {
2842                 err = nfs4_handle_exception(NFS_SERVER(inode),
2843                                 _nfs4_proc_link(inode, dir, name),
2844                                 &exception);
2845         } while (exception.retry);
2846         return err;
2847 }
2848
2849 struct nfs4_createdata {
2850         struct rpc_message msg;
2851         struct nfs4_create_arg arg;
2852         struct nfs4_create_res res;
2853         struct nfs_fh fh;
2854         struct nfs_fattr fattr;
2855         struct nfs_fattr dir_fattr;
2856 };
2857
2858 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2859                 struct qstr *name, struct iattr *sattr, u32 ftype)
2860 {
2861         struct nfs4_createdata *data;
2862
2863         data = kzalloc(sizeof(*data), GFP_KERNEL);
2864         if (data != NULL) {
2865                 struct nfs_server *server = NFS_SERVER(dir);
2866
2867                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2868                 data->msg.rpc_argp = &data->arg;
2869                 data->msg.rpc_resp = &data->res;
2870                 data->arg.dir_fh = NFS_FH(dir);
2871                 data->arg.server = server;
2872                 data->arg.name = name;
2873                 data->arg.attrs = sattr;
2874                 data->arg.ftype = ftype;
2875                 data->arg.bitmask = server->attr_bitmask;
2876                 data->res.server = server;
2877                 data->res.fh = &data->fh;
2878                 data->res.fattr = &data->fattr;
2879                 data->res.dir_fattr = &data->dir_fattr;
2880                 nfs_fattr_init(data->res.fattr);
2881                 nfs_fattr_init(data->res.dir_fattr);
2882         }
2883         return data;
2884 }
2885
2886 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2887 {
2888         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2889                                     &data->arg.seq_args, &data->res.seq_res, 1);
2890         if (status == 0) {
2891                 update_changeattr(dir, &data->res.dir_cinfo);
2892                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2893                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2894         }
2895         return status;
2896 }
2897
2898 static void nfs4_free_createdata(struct nfs4_createdata *data)
2899 {
2900         kfree(data);
2901 }
2902
2903 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2904                 struct page *page, unsigned int len, struct iattr *sattr)
2905 {
2906         struct nfs4_createdata *data;
2907         int status = -ENAMETOOLONG;
2908
2909         if (len > NFS4_MAXPATHLEN)
2910                 goto out;
2911
2912         status = -ENOMEM;
2913         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2914         if (data == NULL)
2915                 goto out;
2916
2917         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2918         data->arg.u.symlink.pages = &page;
2919         data->arg.u.symlink.len = len;
2920
2921         status = nfs4_do_create(dir, dentry, data);
2922
2923         nfs4_free_createdata(data);
2924 out:
2925         return status;
2926 }
2927
2928 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2929                 struct page *page, unsigned int len, struct iattr *sattr)
2930 {
2931         struct nfs4_exception exception = { };
2932         int err;
2933         do {
2934                 err = nfs4_handle_exception(NFS_SERVER(dir),
2935                                 _nfs4_proc_symlink(dir, dentry, page,
2936                                                         len, sattr),
2937                                 &exception);
2938         } while (exception.retry);
2939         return err;
2940 }
2941
2942 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2943                 struct iattr *sattr)
2944 {
2945         struct nfs4_createdata *data;
2946         int status = -ENOMEM;
2947
2948         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2949         if (data == NULL)
2950                 goto out;
2951
2952         status = nfs4_do_create(dir, dentry, data);
2953
2954         nfs4_free_createdata(data);
2955 out:
2956         return status;
2957 }
2958
2959 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2960                 struct iattr *sattr)
2961 {
2962         struct nfs4_exception exception = { };
2963         int err;
2964
2965         sattr->ia_mode &= ~current_umask();
2966         do {
2967                 err = nfs4_handle_exception(NFS_SERVER(dir),
2968                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2969                                 &exception);
2970         } while (exception.retry);
2971         return err;
2972 }
2973
2974 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2975                 u64 cookie, struct page **pages, unsigned int count, int plus)
2976 {
2977         struct inode            *dir = dentry->d_inode;
2978         struct nfs4_readdir_arg args = {
2979                 .fh = NFS_FH(dir),
2980                 .pages = pages,
2981                 .pgbase = 0,
2982                 .count = count,
2983                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2984                 .plus = plus,
2985         };
2986         struct nfs4_readdir_res res;
2987         struct rpc_message msg = {
2988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2989                 .rpc_argp = &args,
2990                 .rpc_resp = &res,
2991                 .rpc_cred = cred,
2992         };
2993         int                     status;
2994
2995         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2996                         dentry->d_parent->d_name.name,
2997                         dentry->d_name.name,
2998                         (unsigned long long)cookie);
2999         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3000         res.pgbase = args.pgbase;
3001         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3002         if (status >= 0) {
3003                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3004                 status += args.pgbase;
3005         }
3006
3007         nfs_invalidate_atime(dir);
3008
3009         dprintk("%s: returns %d\n", __func__, status);
3010         return status;
3011 }
3012
3013 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3014                 u64 cookie, struct page **pages, unsigned int count, int plus)
3015 {
3016         struct nfs4_exception exception = { };
3017         int err;
3018         do {
3019                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3020                                 _nfs4_proc_readdir(dentry, cred, cookie,
3021                                         pages, count, plus),
3022                                 &exception);
3023         } while (exception.retry);
3024         return err;
3025 }
3026
3027 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3028                 struct iattr *sattr, dev_t rdev)
3029 {
3030         struct nfs4_createdata *data;
3031         int mode = sattr->ia_mode;
3032         int status = -ENOMEM;
3033
3034         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3035         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3036
3037         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3038         if (data == NULL)
3039                 goto out;
3040
3041         if (S_ISFIFO(mode))
3042                 data->arg.ftype = NF4FIFO;
3043         else if (S_ISBLK(mode)) {
3044                 data->arg.ftype = NF4BLK;
3045                 data->arg.u.device.specdata1 = MAJOR(rdev);
3046                 data->arg.u.device.specdata2 = MINOR(rdev);
3047         }
3048         else if (S_ISCHR(mode)) {
3049                 data->arg.ftype = NF4CHR;
3050                 data->arg.u.device.specdata1 = MAJOR(rdev);
3051                 data->arg.u.device.specdata2 = MINOR(rdev);
3052         }
3053
3054         status = nfs4_do_create(dir, dentry, data);
3055
3056         nfs4_free_createdata(data);
3057 out:
3058         return status;
3059 }
3060
3061 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3062                 struct iattr *sattr, dev_t rdev)
3063 {
3064         struct nfs4_exception exception = { };
3065         int err;
3066
3067         sattr->ia_mode &= ~current_umask();
3068         do {
3069                 err = nfs4_handle_exception(NFS_SERVER(dir),
3070                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3071                                 &exception);
3072         } while (exception.retry);
3073         return err;
3074 }
3075
3076 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3077                  struct nfs_fsstat *fsstat)
3078 {
3079         struct nfs4_statfs_arg args = {
3080                 .fh = fhandle,
3081                 .bitmask = server->attr_bitmask,
3082         };
3083         struct nfs4_statfs_res res = {
3084                 .fsstat = fsstat,
3085         };
3086         struct rpc_message msg = {
3087                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3088                 .rpc_argp = &args,
3089                 .rpc_resp = &res,
3090         };
3091
3092         nfs_fattr_init(fsstat->fattr);
3093         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3094 }
3095
3096 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3097 {
3098         struct nfs4_exception exception = { };
3099         int err;
3100         do {
3101                 err = nfs4_handle_exception(server,
3102                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3103                                 &exception);
3104         } while (exception.retry);
3105         return err;
3106 }
3107
3108 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3109                 struct nfs_fsinfo *fsinfo)
3110 {
3111         struct nfs4_fsinfo_arg args = {
3112                 .fh = fhandle,
3113                 .bitmask = server->attr_bitmask,
3114         };
3115         struct nfs4_fsinfo_res res = {
3116                 .fsinfo = fsinfo,
3117         };
3118         struct rpc_message msg = {
3119                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3120                 .rpc_argp = &args,
3121                 .rpc_resp = &res,
3122         };
3123
3124         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3125 }
3126
3127 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3128 {
3129         struct nfs4_exception exception = { };
3130         int err;
3131
3132         do {
3133                 err = nfs4_handle_exception(server,
3134                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3135                                 &exception);
3136         } while (exception.retry);
3137         return err;
3138 }
3139
3140 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3141 {
3142         nfs_fattr_init(fsinfo->fattr);
3143         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3144 }
3145
3146 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3147                 struct nfs_pathconf *pathconf)
3148 {
3149         struct nfs4_pathconf_arg args = {
3150                 .fh = fhandle,
3151                 .bitmask = server->attr_bitmask,
3152         };
3153         struct nfs4_pathconf_res res = {
3154                 .pathconf = pathconf,
3155         };
3156         struct rpc_message msg = {
3157                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3158                 .rpc_argp = &args,
3159                 .rpc_resp = &res,
3160         };
3161
3162         /* None of the pathconf attributes are mandatory to implement */
3163         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3164                 memset(pathconf, 0, sizeof(*pathconf));
3165                 return 0;
3166         }
3167
3168         nfs_fattr_init(pathconf->fattr);
3169         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3170 }
3171
3172 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3173                 struct nfs_pathconf *pathconf)
3174 {
3175         struct nfs4_exception exception = { };
3176         int err;
3177
3178         do {
3179                 err = nfs4_handle_exception(server,
3180                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3181                                 &exception);
3182         } while (exception.retry);
3183         return err;
3184 }
3185
3186 void __nfs4_read_done_cb(struct nfs_read_data *data)
3187 {
3188         nfs_invalidate_atime(data->inode);
3189 }
3190
3191 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3192 {
3193         struct nfs_server *server = NFS_SERVER(data->inode);
3194
3195         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3196                 nfs_restart_rpc(task, server->nfs_client);
3197                 return -EAGAIN;
3198         }
3199
3200         __nfs4_read_done_cb(data);
3201         if (task->tk_status > 0)
3202                 renew_lease(server, data->timestamp);
3203         return 0;
3204 }
3205
3206 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3207 {
3208
3209         dprintk("--> %s\n", __func__);
3210
3211         if (!nfs4_sequence_done(task, &data->res.seq_res))
3212                 return -EAGAIN;
3213
3214         return data->read_done_cb ? data->read_done_cb(task, data) :
3215                                     nfs4_read_done_cb(task, data);
3216 }
3217
3218 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3219 {
3220         data->timestamp   = jiffies;
3221         data->read_done_cb = nfs4_read_done_cb;
3222         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3223 }
3224
3225 /* Reset the the nfs_read_data to send the read to the MDS. */
3226 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3227 {
3228         dprintk("%s Reset task for i/o through\n", __func__);
3229         put_lseg(data->lseg);
3230         data->lseg = NULL;
3231         /* offsets will differ in the dense stripe case */
3232         data->args.offset = data->mds_offset;
3233         data->ds_clp = NULL;
3234         data->args.fh     = NFS_FH(data->inode);
3235         data->read_done_cb = nfs4_read_done_cb;
3236         task->tk_ops = data->mds_ops;
3237         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3238 }
3239 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3240
3241 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3242 {
3243         struct inode *inode = data->inode;
3244
3245         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3246                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3247                 return -EAGAIN;
3248         }
3249         if (task->tk_status >= 0) {
3250                 renew_lease(NFS_SERVER(inode), data->timestamp);
3251                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3252         }
3253         return 0;
3254 }
3255
3256 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3257 {
3258         if (!nfs4_sequence_done(task, &data->res.seq_res))
3259                 return -EAGAIN;
3260         return data->write_done_cb ? data->write_done_cb(task, data) :
3261                 nfs4_write_done_cb(task, data);
3262 }
3263
3264 /* Reset the the nfs_write_data to send the write to the MDS. */
3265 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3266 {
3267         dprintk("%s Reset task for i/o through\n", __func__);
3268         put_lseg(data->lseg);
3269         data->lseg          = NULL;
3270         data->ds_clp        = NULL;
3271         data->write_done_cb = nfs4_write_done_cb;
3272         data->args.fh       = NFS_FH(data->inode);
3273         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3274         data->args.offset   = data->mds_offset;
3275         data->res.fattr     = &data->fattr;
3276         task->tk_ops        = data->mds_ops;
3277         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3278 }
3279 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3280
3281 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3282 {
3283         struct nfs_server *server = NFS_SERVER(data->inode);
3284
3285         if (data->lseg) {
3286                 data->args.bitmask = NULL;
3287                 data->res.fattr = NULL;
3288         } else
3289                 data->args.bitmask = server->cache_consistency_bitmask;
3290         if (!data->write_done_cb)
3291                 data->write_done_cb = nfs4_write_done_cb;
3292         data->res.server = server;
3293         data->timestamp   = jiffies;
3294
3295         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3296 }
3297
3298 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3299 {
3300         struct inode *inode = data->inode;
3301
3302         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3303                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3304                 return -EAGAIN;
3305         }
3306         nfs_refresh_inode(inode, data->res.fattr);
3307         return 0;
3308 }
3309
3310 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3311 {
3312         if (!nfs4_sequence_done(task, &data->res.seq_res))
3313                 return -EAGAIN;
3314         return data->write_done_cb(task, data);
3315 }
3316
3317 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3318 {
3319         struct nfs_server *server = NFS_SERVER(data->inode);
3320
3321         if (data->lseg) {
3322                 data->args.bitmask = NULL;
3323                 data->res.fattr = NULL;
3324         } else
3325                 data->args.bitmask = server->cache_consistency_bitmask;
3326         if (!data->write_done_cb)
3327                 data->write_done_cb = nfs4_commit_done_cb;
3328         data->res.server = server;
3329         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3330 }
3331
3332 struct nfs4_renewdata {
3333         struct nfs_client       *client;
3334         unsigned long           timestamp;
3335 };
3336
3337 /*
3338  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3339  * standalone procedure for queueing an asynchronous RENEW.
3340  */
3341 static void nfs4_renew_release(void *calldata)
3342 {
3343         struct nfs4_renewdata *data = calldata;
3344         struct nfs_client *clp = data->client;
3345
3346         if (atomic_read(&clp->cl_count) > 1)
3347                 nfs4_schedule_state_renewal(clp);
3348         nfs_put_client(clp);
3349         kfree(data);
3350 }
3351
3352 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3353 {
3354         struct nfs4_renewdata *data = calldata;
3355         struct nfs_client *clp = data->client;
3356         unsigned long timestamp = data->timestamp;
3357
3358         if (task->tk_status < 0) {
3359                 /* Unless we're shutting down, schedule state recovery! */
3360                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3361                         nfs4_schedule_lease_recovery(clp);
3362                 return;
3363         }
3364         do_renew_lease(clp, timestamp);
3365 }
3366
3367 static const struct rpc_call_ops nfs4_renew_ops = {
3368         .rpc_call_done = nfs4_renew_done,
3369         .rpc_release = nfs4_renew_release,
3370 };
3371
3372 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3373 {
3374         struct rpc_message msg = {
3375                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3376                 .rpc_argp       = clp,
3377                 .rpc_cred       = cred,
3378         };
3379         struct nfs4_renewdata *data;
3380
3381         if (!atomic_inc_not_zero(&clp->cl_count))
3382                 return -EIO;
3383         data = kmalloc(sizeof(*data), GFP_KERNEL);
3384         if (data == NULL)
3385                 return -ENOMEM;
3386         data->client = clp;
3387         data->timestamp = jiffies;
3388         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3389                         &nfs4_renew_ops, data);
3390 }
3391
3392 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3393 {
3394         struct rpc_message msg = {
3395                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3396                 .rpc_argp       = clp,
3397                 .rpc_cred       = cred,
3398         };
3399         unsigned long now = jiffies;
3400         int status;
3401
3402         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3403         if (status < 0)
3404                 return status;
3405         do_renew_lease(clp, now);
3406         return 0;
3407 }
3408
3409 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3410 {
3411         return (server->caps & NFS_CAP_ACLS)
3412                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3413                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3414 }
3415
3416 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3417  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3418  * the stack.
3419  */
3420 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3421
3422 static void buf_to_pages(const void *buf, size_t buflen,
3423                 struct page **pages, unsigned int *pgbase)
3424 {
3425         const void *p = buf;
3426
3427         *pgbase = offset_in_page(buf);
3428         p -= *pgbase;
3429         while (p < buf + buflen) {
3430                 *(pages++) = virt_to_page(p);
3431                 p += PAGE_CACHE_SIZE;
3432         }
3433 }
3434
3435 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3436                 struct page **pages, unsigned int *pgbase)
3437 {
3438         struct page *newpage, **spages;
3439         int rc = 0;
3440         size_t len;
3441         spages = pages;
3442
3443         do {
3444                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3445                 newpage = alloc_page(GFP_KERNEL);
3446
3447                 if (newpage == NULL)
3448                         goto unwind;
3449                 memcpy(page_address(newpage), buf, len);
3450                 buf += len;
3451                 buflen -= len;
3452                 *pages++ = newpage;
3453                 rc++;
3454         } while (buflen != 0);
3455
3456         return rc;
3457
3458 unwind:
3459         for(; rc > 0; rc--)
3460                 __free_page(spages[rc-1]);
3461         return -ENOMEM;
3462 }
3463
3464 struct nfs4_cached_acl {
3465         int cached;
3466         size_t len;
3467         char data[0];
3468 };
3469
3470 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3471 {
3472         struct nfs_inode *nfsi = NFS_I(inode);
3473
3474         spin_lock(&inode->i_lock);
3475         kfree(nfsi->nfs4_acl);
3476         nfsi->nfs4_acl = acl;
3477         spin_unlock(&inode->i_lock);
3478 }
3479
3480 static void nfs4_zap_acl_attr(struct inode *inode)
3481 {
3482         nfs4_set_cached_acl(inode, NULL);
3483 }
3484
3485 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3486 {
3487         struct nfs_inode *nfsi = NFS_I(inode);
3488         struct nfs4_cached_acl *acl;
3489         int ret = -ENOENT;
3490
3491         spin_lock(&inode->i_lock);
3492         acl = nfsi->nfs4_acl;
3493         if (acl == NULL)
3494                 goto out;
3495         if (buf == NULL) /* user is just asking for length */
3496                 goto out_len;
3497         if (acl->cached == 0)
3498                 goto out;
3499         ret = -ERANGE; /* see getxattr(2) man page */
3500         if (acl->len > buflen)
3501                 goto out;
3502         memcpy(buf, acl->data, acl->len);
3503 out_len:
3504         ret = acl->len;
3505 out:
3506         spin_unlock(&inode->i_lock);
3507         return ret;
3508 }
3509
3510 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3511 {
3512         struct nfs4_cached_acl *acl;
3513
3514         if (buf && acl_len <= PAGE_SIZE) {
3515                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3516                 if (acl == NULL)
3517                         goto out;
3518                 acl->cached = 1;
3519                 memcpy(acl->data, buf, acl_len);
3520         } else {
3521                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3522                 if (acl == NULL)
3523                         goto out;
3524                 acl->cached = 0;
3525         }
3526         acl->len = acl_len;
3527 out:
3528         nfs4_set_cached_acl(inode, acl);
3529 }
3530
3531 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3532 {
3533         struct page *pages[NFS4ACL_MAXPAGES];
3534         struct nfs_getaclargs args = {
3535                 .fh = NFS_FH(inode),
3536                 .acl_pages = pages,
3537                 .acl_len = buflen,
3538         };
3539         struct nfs_getaclres res = {
3540                 .acl_len = buflen,
3541         };
3542         void *resp_buf;
3543         struct rpc_message msg = {
3544                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3545                 .rpc_argp = &args,
3546                 .rpc_resp = &res,
3547         };
3548         struct page *localpage = NULL;
3549         int ret;
3550
3551         if (buflen < PAGE_SIZE) {
3552                 /* As long as we're doing a round trip to the server anyway,
3553                  * let's be prepared for a page of acl data. */
3554                 localpage = alloc_page(GFP_KERNEL);
3555                 resp_buf = page_address(localpage);
3556                 if (localpage == NULL)
3557                         return -ENOMEM;
3558                 args.acl_pages[0] = localpage;
3559                 args.acl_pgbase = 0;
3560                 args.acl_len = PAGE_SIZE;
3561         } else {
3562                 resp_buf = buf;
3563                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3564         }
3565         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3566         if (ret)
3567                 goto out_free;
3568         if (res.acl_len > args.acl_len)
3569                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3570         else
3571                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3572         if (buf) {
3573                 ret = -ERANGE;
3574                 if (res.acl_len > buflen)
3575                         goto out_free;
3576                 if (localpage)
3577                         memcpy(buf, resp_buf, res.acl_len);
3578         }
3579         ret = res.acl_len;
3580 out_free:
3581         if (localpage)
3582                 __free_page(localpage);
3583         return ret;
3584 }
3585
3586 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3587 {
3588         struct nfs4_exception exception = { };
3589         ssize_t ret;
3590         do {
3591                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3592                 if (ret >= 0)
3593                         break;
3594                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3595         } while (exception.retry);
3596         return ret;
3597 }
3598
3599 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3600 {
3601         struct nfs_server *server = NFS_SERVER(inode);
3602         int ret;
3603
3604         if (!nfs4_server_supports_acls(server))
3605                 return -EOPNOTSUPP;
3606         ret = nfs_revalidate_inode(server, inode);
3607         if (ret < 0)
3608                 return ret;
3609         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3610                 nfs_zap_acl_cache(inode);
3611         ret = nfs4_read_cached_acl(inode, buf, buflen);
3612         if (ret != -ENOENT)
3613                 return ret;
3614         return nfs4_get_acl_uncached(inode, buf, buflen);
3615 }
3616
3617 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3618 {
3619         struct nfs_server *server = NFS_SERVER(inode);
3620         struct page *pages[NFS4ACL_MAXPAGES];
3621         struct nfs_setaclargs arg = {
3622                 .fh             = NFS_FH(inode),
3623                 .acl_pages      = pages,
3624                 .acl_len        = buflen,
3625         };
3626         struct nfs_setaclres res;
3627         struct rpc_message msg = {
3628                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3629                 .rpc_argp       = &arg,
3630                 .rpc_resp       = &res,
3631         };
3632         int ret, i;
3633
3634         if (!nfs4_server_supports_acls(server))
3635                 return -EOPNOTSUPP;
3636         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3637         if (i < 0)
3638                 return i;
3639         nfs_inode_return_delegation(inode);
3640         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3641
3642         /*
3643          * Free each page after tx, so the only ref left is
3644          * held by the network stack
3645          */
3646         for (; i > 0; i--)
3647                 put_page(pages[i-1]);
3648
3649         /*
3650          * Acl update can result in inode attribute update.
3651          * so mark the attribute cache invalid.
3652          */
3653         spin_lock(&inode->i_lock);
3654         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3655         spin_unlock(&inode->i_lock);
3656         nfs_access_zap_cache(inode);
3657         nfs_zap_acl_cache(inode);
3658         return ret;
3659 }
3660
3661 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3662 {
3663         struct nfs4_exception exception = { };
3664         int err;
3665         do {
3666                 err = nfs4_handle_exception(NFS_SERVER(inode),
3667                                 __nfs4_proc_set_acl(inode, buf, buflen),
3668                                 &exception);
3669         } while (exception.retry);
3670         return err;
3671 }
3672
3673 static int
3674 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3675 {
3676         struct nfs_client *clp = server->nfs_client;
3677
3678         if (task->tk_status >= 0)
3679                 return 0;
3680         switch(task->tk_status) {
3681                 case -NFS4ERR_ADMIN_REVOKED:
3682                 case -NFS4ERR_BAD_STATEID:
3683                 case -NFS4ERR_OPENMODE:
3684                         if (state == NULL)
3685                                 break;
3686                         nfs4_schedule_stateid_recovery(server, state);
3687                         goto wait_on_recovery;
3688                 case -NFS4ERR_EXPIRED:
3689                         if (state != NULL)
3690                                 nfs4_schedule_stateid_recovery(server, state);
3691                 case -NFS4ERR_STALE_STATEID:
3692                 case -NFS4ERR_STALE_CLIENTID:
3693                         nfs4_schedule_lease_recovery(clp);
3694                         goto wait_on_recovery;
3695 #if defined(CONFIG_NFS_V4_1)
3696                 case -NFS4ERR_BADSESSION:
3697                 case -NFS4ERR_BADSLOT:
3698                 case -NFS4ERR_BAD_HIGH_SLOT:
3699                 case -NFS4ERR_DEADSESSION:
3700                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3701                 case -NFS4ERR_SEQ_FALSE_RETRY:
3702                 case -NFS4ERR_SEQ_MISORDERED:
3703                         dprintk("%s ERROR %d, Reset session\n", __func__,
3704                                 task->tk_status);
3705                         nfs4_schedule_session_recovery(clp->cl_session);
3706                         task->tk_status = 0;
3707                         return -EAGAIN;
3708 #endif /* CONFIG_NFS_V4_1 */
3709                 case -NFS4ERR_DELAY:
3710                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3711                 case -NFS4ERR_GRACE:
3712                 case -EKEYEXPIRED:
3713                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3714                         task->tk_status = 0;
3715                         return -EAGAIN;
3716                 case -NFS4ERR_RETRY_UNCACHED_REP:
3717                 case -NFS4ERR_OLD_STATEID:
3718                         task->tk_status = 0;
3719                         return -EAGAIN;
3720         }
3721         task->tk_status = nfs4_map_errors(task->tk_status);
3722         return 0;
3723 wait_on_recovery:
3724         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3725         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3726                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3727         task->tk_status = 0;
3728         return -EAGAIN;
3729 }
3730
3731 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3732                 unsigned short port, struct rpc_cred *cred,
3733                 struct nfs4_setclientid_res *res)
3734 {
3735         nfs4_verifier sc_verifier;
3736         struct nfs4_setclientid setclientid = {
3737                 .sc_verifier = &sc_verifier,
3738                 .sc_prog = program,
3739                 .sc_cb_ident = clp->cl_cb_ident,
3740         };
3741         struct rpc_message msg = {
3742                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3743                 .rpc_argp = &setclientid,
3744                 .rpc_resp = res,
3745                 .rpc_cred = cred,
3746         };
3747         __be32 *p;
3748         int loop = 0;
3749         int status;
3750
3751         p = (__be32*)sc_verifier.data;
3752         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3753         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3754
3755         for(;;) {
3756                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3757                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3758                                 clp->cl_ipaddr,
3759                                 rpc_peeraddr2str(clp->cl_rpcclient,
3760                                                         RPC_DISPLAY_ADDR),
3761                                 rpc_peeraddr2str(clp->cl_rpcclient,
3762                                                         RPC_DISPLAY_PROTO),
3763                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3764                                 clp->cl_id_uniquifier);
3765                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3766                                 sizeof(setclientid.sc_netid),
3767                                 rpc_peeraddr2str(clp->cl_rpcclient,
3768                                                         RPC_DISPLAY_NETID));
3769                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3770                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3771                                 clp->cl_ipaddr, port >> 8, port & 255);
3772
3773                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3774                 if (status != -NFS4ERR_CLID_INUSE)
3775                         break;
3776                 if (loop != 0) {
3777                         ++clp->cl_id_uniquifier;
3778                         break;
3779                 }
3780                 ++loop;
3781                 ssleep(clp->cl_lease_time / HZ + 1);
3782         }
3783         return status;
3784 }
3785
3786 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3787                 struct nfs4_setclientid_res *arg,
3788                 struct rpc_cred *cred)
3789 {
3790         struct nfs_fsinfo fsinfo;
3791         struct rpc_message msg = {
3792                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3793                 .rpc_argp = arg,
3794                 .rpc_resp = &fsinfo,
3795                 .rpc_cred = cred,
3796         };
3797         unsigned long now;
3798         int status;
3799
3800         now = jiffies;
3801         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3802         if (status == 0) {
3803                 spin_lock(&clp->cl_lock);
3804                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3805                 clp->cl_last_renewal = now;
3806                 spin_unlock(&clp->cl_lock);
3807         }
3808         return status;
3809 }
3810
3811 struct nfs4_delegreturndata {
3812         struct nfs4_delegreturnargs args;
3813         struct nfs4_delegreturnres res;
3814         struct nfs_fh fh;
3815         nfs4_stateid stateid;
3816         unsigned long timestamp;
3817         struct nfs_fattr fattr;
3818         int rpc_status;
3819 };
3820
3821 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3822 {
3823         struct nfs4_delegreturndata *data = calldata;
3824
3825         if (!nfs4_sequence_done(task, &data->res.seq_res))
3826                 return;
3827
3828         switch (task->tk_status) {
3829         case -NFS4ERR_STALE_STATEID:
3830         case -NFS4ERR_EXPIRED:
3831         case 0:
3832                 renew_lease(data->res.server, data->timestamp);
3833                 break;
3834         default:
3835                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3836                                 -EAGAIN) {
3837                         nfs_restart_rpc(task, data->res.server->nfs_client);
3838                         return;
3839                 }
3840         }
3841         data->rpc_status = task->tk_status;
3842 }
3843
3844 static void nfs4_delegreturn_release(void *calldata)
3845 {
3846         kfree(calldata);
3847 }
3848
3849 #if defined(CONFIG_NFS_V4_1)
3850 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3851 {
3852         struct nfs4_delegreturndata *d_data;
3853
3854         d_data = (struct nfs4_delegreturndata *)data;
3855
3856         if (nfs4_setup_sequence(d_data->res.server,
3857                                 &d_data->args.seq_args,
3858                                 &d_data->res.seq_res, 1, task))
3859                 return;
3860         rpc_call_start(task);
3861 }
3862 #endif /* CONFIG_NFS_V4_1 */
3863
3864 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3865 #if defined(CONFIG_NFS_V4_1)
3866         .rpc_call_prepare = nfs4_delegreturn_prepare,
3867 #endif /* CONFIG_NFS_V4_1 */
3868         .rpc_call_done = nfs4_delegreturn_done,
3869         .rpc_release = nfs4_delegreturn_release,
3870 };
3871
3872 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3873 {
3874         struct nfs4_delegreturndata *data;
3875         struct nfs_server *server = NFS_SERVER(inode);
3876         struct rpc_task *task;
3877         struct rpc_message msg = {
3878                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3879                 .rpc_cred = cred,
3880         };
3881         struct rpc_task_setup task_setup_data = {
3882                 .rpc_client = server->client,
3883                 .rpc_message = &msg,
3884                 .callback_ops = &nfs4_delegreturn_ops,
3885                 .flags = RPC_TASK_ASYNC,
3886         };
3887         int status = 0;
3888
3889         data = kzalloc(sizeof(*data), GFP_NOFS);
3890         if (data == NULL)
3891                 return -ENOMEM;
3892         data->args.fhandle = &data->fh;
3893         data->args.stateid = &data->stateid;
3894         data->args.bitmask = server->attr_bitmask;
3895         nfs_copy_fh(&data->fh, NFS_FH(inode));
3896         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3897         data->res.fattr = &data->fattr;
3898         data->res.server = server;
3899         nfs_fattr_init(data->res.fattr);
3900         data->timestamp = jiffies;
3901         data->rpc_status = 0;
3902
3903         task_setup_data.callback_data = data;
3904         msg.rpc_argp = &data->args;
3905         msg.rpc_resp = &data->res;
3906         task = rpc_run_task(&task_setup_data);
3907         if (IS_ERR(task))
3908                 return PTR_ERR(task);
3909         if (!issync)
3910                 goto out;
3911         status = nfs4_wait_for_completion_rpc_task(task);
3912         if (status != 0)
3913                 goto out;
3914         status = data->rpc_status;
3915         if (status != 0)
3916                 goto out;
3917         nfs_refresh_inode(inode, &data->fattr);
3918 out:
3919         rpc_put_task(task);
3920         return status;
3921 }
3922
3923 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3924 {
3925         struct nfs_server *server = NFS_SERVER(inode);
3926         struct nfs4_exception exception = { };
3927         int err;
3928         do {
3929                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3930                 switch (err) {
3931                         case -NFS4ERR_STALE_STATEID:
3932                         case -NFS4ERR_EXPIRED:
3933                         case 0:
3934                                 return 0;
3935                 }
3936                 err = nfs4_handle_exception(server, err, &exception);
3937         } while (exception.retry);
3938         return err;
3939 }
3940
3941 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3942 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3943
3944 /*
3945  * sleep, with exponential backoff, and retry the LOCK operation.
3946  */
3947 static unsigned long
3948 nfs4_set_lock_task_retry(unsigned long timeout)
3949 {
3950         schedule_timeout_killable(timeout);
3951         timeout <<= 1;
3952         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3953                 return NFS4_LOCK_MAXTIMEOUT;
3954         return timeout;
3955 }
3956
3957 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3958 {
3959         struct inode *inode = state->inode;
3960         struct nfs_server *server = NFS_SERVER(inode);
3961         struct nfs_client *clp = server->nfs_client;
3962         struct nfs_lockt_args arg = {
3963                 .fh = NFS_FH(inode),
3964                 .fl = request,
3965         };
3966         struct nfs_lockt_res res = {
3967                 .denied = request,
3968         };
3969         struct rpc_message msg = {
3970                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3971                 .rpc_argp       = &arg,
3972                 .rpc_resp       = &res,
3973                 .rpc_cred       = state->owner->so_cred,
3974         };
3975         struct nfs4_lock_state *lsp;
3976         int status;
3977
3978         arg.lock_owner.clientid = clp->cl_clientid;
3979         status = nfs4_set_lock_state(state, request);
3980         if (status != 0)
3981                 goto out;
3982         lsp = request->fl_u.nfs4_fl.owner;
3983         arg.lock_owner.id = lsp->ls_id.id;
3984         arg.lock_owner.s_dev = server->s_dev;
3985         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3986         switch (status) {
3987                 case 0:
3988                         request->fl_type = F_UNLCK;
3989                         break;
3990                 case -NFS4ERR_DENIED:
3991                         status = 0;
3992         }
3993         request->fl_ops->fl_release_private(request);
3994 out:
3995         return status;
3996 }
3997
3998 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3999 {
4000         struct nfs4_exception exception = { };
4001         int err;
4002
4003         do {
4004                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4005                                 _nfs4_proc_getlk(state, cmd, request),
4006                                 &exception);
4007         } while (exception.retry);
4008         return err;
4009 }
4010
4011 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4012 {
4013         int res = 0;
4014         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4015                 case FL_POSIX:
4016                         res = posix_lock_file_wait(file, fl);
4017                         break;
4018                 case FL_FLOCK:
4019                         res = flock_lock_file_wait(file, fl);
4020                         break;
4021                 default:
4022                         BUG();
4023         }
4024         return res;
4025 }
4026
4027 struct nfs4_unlockdata {
4028         struct nfs_locku_args arg;
4029         struct nfs_locku_res res;
4030         struct nfs4_lock_state *lsp;
4031         struct nfs_open_context *ctx;
4032         struct file_lock fl;
4033         const struct nfs_server *server;
4034         unsigned long timestamp;
4035 };
4036
4037 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4038                 struct nfs_open_context *ctx,
4039                 struct nfs4_lock_state *lsp,
4040                 struct nfs_seqid *seqid)
4041 {
4042         struct nfs4_unlockdata *p;
4043         struct inode *inode = lsp->ls_state->inode;
4044
4045         p = kzalloc(sizeof(*p), GFP_NOFS);
4046         if (p == NULL)
4047                 return NULL;
4048         p->arg.fh = NFS_FH(inode);
4049         p->arg.fl = &p->fl;
4050         p->arg.seqid = seqid;
4051         p->res.seqid = seqid;
4052         p->arg.stateid = &lsp->ls_stateid;
4053         p->lsp = lsp;
4054         atomic_inc(&lsp->ls_count);
4055         /* Ensure we don't close file until we're done freeing locks! */
4056         p->ctx = get_nfs_open_context(ctx);
4057         memcpy(&p->fl, fl, sizeof(p->fl));
4058         p->server = NFS_SERVER(inode);
4059         return p;
4060 }
4061
4062 static void nfs4_locku_release_calldata(void *data)
4063 {
4064         struct nfs4_unlockdata *calldata = data;
4065         nfs_free_seqid(calldata->arg.seqid);
4066         nfs4_put_lock_state(calldata->lsp);
4067         put_nfs_open_context(calldata->ctx);
4068         kfree(calldata);
4069 }
4070
4071 static void nfs4_locku_done(struct rpc_task *task, void *data)
4072 {
4073         struct nfs4_unlockdata *calldata = data;
4074
4075         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4076                 return;
4077         switch (task->tk_status) {
4078                 case 0:
4079                         memcpy(calldata->lsp->ls_stateid.data,
4080                                         calldata->res.stateid.data,
4081                                         sizeof(calldata->lsp->ls_stateid.data));
4082                         renew_lease(calldata->server, calldata->timestamp);
4083                         break;
4084                 case -NFS4ERR_BAD_STATEID:
4085                 case -NFS4ERR_OLD_STATEID:
4086                 case -NFS4ERR_STALE_STATEID:
4087                 case -NFS4ERR_EXPIRED:
4088                         break;
4089                 default:
4090                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4091                                 nfs_restart_rpc(task,
4092                                                  calldata->server->nfs_client);
4093         }
4094 }
4095
4096 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4097 {
4098         struct nfs4_unlockdata *calldata = data;
4099
4100         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4101                 return;
4102         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4103                 /* Note: exit _without_ running nfs4_locku_done */
4104                 task->tk_action = NULL;
4105                 return;
4106         }
4107         calldata->timestamp = jiffies;
4108         if (nfs4_setup_sequence(calldata->server,
4109                                 &calldata->arg.seq_args,
4110                                 &calldata->res.seq_res, 1, task))
4111                 return;
4112         rpc_call_start(task);
4113 }
4114
4115 static const struct rpc_call_ops nfs4_locku_ops = {
4116         .rpc_call_prepare = nfs4_locku_prepare,
4117         .rpc_call_done = nfs4_locku_done,
4118         .rpc_release = nfs4_locku_release_calldata,
4119 };
4120
4121 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4122                 struct nfs_open_context *ctx,
4123                 struct nfs4_lock_state *lsp,
4124                 struct nfs_seqid *seqid)
4125 {
4126         struct nfs4_unlockdata *data;
4127         struct rpc_message msg = {
4128                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4129                 .rpc_cred = ctx->cred,
4130         };
4131         struct rpc_task_setup task_setup_data = {
4132                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4133                 .rpc_message = &msg,
4134                 .callback_ops = &nfs4_locku_ops,
4135                 .workqueue = nfsiod_workqueue,
4136                 .flags = RPC_TASK_ASYNC,
4137         };
4138
4139         /* Ensure this is an unlock - when canceling a lock, the
4140          * canceled lock is passed in, and it won't be an unlock.
4141          */
4142         fl->fl_type = F_UNLCK;
4143
4144         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4145         if (data == NULL) {
4146                 nfs_free_seqid(seqid);
4147                 return ERR_PTR(-ENOMEM);
4148         }
4149
4150         msg.rpc_argp = &data->arg;
4151         msg.rpc_resp = &data->res;
4152         task_setup_data.callback_data = data;
4153         return rpc_run_task(&task_setup_data);
4154 }
4155
4156 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4157 {
4158         struct nfs_inode *nfsi = NFS_I(state->inode);
4159         struct nfs_seqid *seqid;
4160         struct nfs4_lock_state *lsp;
4161         struct rpc_task *task;
4162         int status = 0;
4163         unsigned char fl_flags = request->fl_flags;
4164
4165         status = nfs4_set_lock_state(state, request);
4166         /* Unlock _before_ we do the RPC call */
4167         request->fl_flags |= FL_EXISTS;
4168         down_read(&nfsi->rwsem);
4169         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4170                 up_read(&nfsi->rwsem);
4171                 goto out;
4172         }
4173         up_read(&nfsi->rwsem);
4174         if (status != 0)
4175                 goto out;
4176         /* Is this a delegated lock? */
4177         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4178                 goto out;
4179         lsp = request->fl_u.nfs4_fl.owner;
4180         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4181         status = -ENOMEM;
4182         if (seqid == NULL)
4183                 goto out;
4184         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4185         status = PTR_ERR(task);
4186         if (IS_ERR(task))
4187                 goto out;
4188         status = nfs4_wait_for_completion_rpc_task(task);
4189         rpc_put_task(task);
4190 out:
4191         request->fl_flags = fl_flags;
4192         return status;
4193 }
4194
4195 struct nfs4_lockdata {
4196         struct nfs_lock_args arg;
4197         struct nfs_lock_res res;
4198         struct nfs4_lock_state *lsp;
4199         struct nfs_open_context *ctx;
4200         struct file_lock fl;
4201         unsigned long timestamp;
4202         int rpc_status;
4203         int cancelled;
4204         struct nfs_server *server;
4205 };
4206
4207 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4208                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4209                 gfp_t gfp_mask)
4210 {
4211         struct nfs4_lockdata *p;
4212         struct inode *inode = lsp->ls_state->inode;
4213         struct nfs_server *server = NFS_SERVER(inode);
4214
4215         p = kzalloc(sizeof(*p), gfp_mask);
4216         if (p == NULL)
4217                 return NULL;
4218
4219         p->arg.fh = NFS_FH(inode);
4220         p->arg.fl = &p->fl;
4221         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4222         if (p->arg.open_seqid == NULL)
4223                 goto out_free;
4224         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4225         if (p->arg.lock_seqid == NULL)
4226                 goto out_free_seqid;
4227         p->arg.lock_stateid = &lsp->ls_stateid;
4228         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4229         p->arg.lock_owner.id = lsp->ls_id.id;
4230         p->arg.lock_owner.s_dev = server->s_dev;
4231         p->res.lock_seqid = p->arg.lock_seqid;
4232         p->lsp = lsp;
4233         p->server = server;
4234         atomic_inc(&lsp->ls_count);
4235         p->ctx = get_nfs_open_context(ctx);
4236         memcpy(&p->fl, fl, sizeof(p->fl));
4237         return p;
4238 out_free_seqid:
4239         nfs_free_seqid(p->arg.open_seqid);
4240 out_free:
4241         kfree(p);
4242         return NULL;
4243 }
4244
4245 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4246 {
4247         struct nfs4_lockdata *data = calldata;
4248         struct nfs4_state *state = data->lsp->ls_state;
4249
4250         dprintk("%s: begin!\n", __func__);
4251         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4252                 return;
4253         /* Do we need to do an open_to_lock_owner? */
4254         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4255                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4256                         return;
4257                 data->arg.open_stateid = &state->stateid;
4258                 data->arg.new_lock_owner = 1;
4259                 data->res.open_seqid = data->arg.open_seqid;
4260         } else
4261                 data->arg.new_lock_owner = 0;
4262         data->timestamp = jiffies;
4263         if (nfs4_setup_sequence(data->server,
4264                                 &data->arg.seq_args,
4265                                 &data->res.seq_res, 1, task))
4266                 return;
4267         rpc_call_start(task);
4268         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4269 }
4270
4271 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4272 {
4273         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4274         nfs4_lock_prepare(task, calldata);
4275 }
4276
4277 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4278 {
4279         struct nfs4_lockdata *data = calldata;
4280
4281         dprintk("%s: begin!\n", __func__);
4282
4283         if (!nfs4_sequence_done(task, &data->res.seq_res))
4284                 return;
4285
4286         data->rpc_status = task->tk_status;
4287         if (data->arg.new_lock_owner != 0) {
4288                 if (data->rpc_status == 0)
4289                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4290                 else
4291                         goto out;
4292         }
4293         if (data->rpc_status == 0) {
4294                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4295                                         sizeof(data->lsp->ls_stateid.data));
4296                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4297                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4298         }
4299 out:
4300         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4301 }
4302
4303 static void nfs4_lock_release(void *calldata)
4304 {
4305         struct nfs4_lockdata *data = calldata;
4306
4307         dprintk("%s: begin!\n", __func__);
4308         nfs_free_seqid(data->arg.open_seqid);
4309         if (data->cancelled != 0) {
4310                 struct rpc_task *task;
4311                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4312                                 data->arg.lock_seqid);
4313                 if (!IS_ERR(task))
4314                         rpc_put_task_async(task);
4315                 dprintk("%s: cancelling lock!\n", __func__);
4316         } else
4317                 nfs_free_seqid(data->arg.lock_seqid);
4318         nfs4_put_lock_state(data->lsp);
4319         put_nfs_open_context(data->ctx);
4320         kfree(data);
4321         dprintk("%s: done!\n", __func__);
4322 }
4323
4324 static const struct rpc_call_ops nfs4_lock_ops = {
4325         .rpc_call_prepare = nfs4_lock_prepare,
4326         .rpc_call_done = nfs4_lock_done,
4327         .rpc_release = nfs4_lock_release,
4328 };
4329
4330 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4331         .rpc_call_prepare = nfs4_recover_lock_prepare,
4332         .rpc_call_done = nfs4_lock_done,
4333         .rpc_release = nfs4_lock_release,
4334 };
4335
4336 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4337 {
4338         switch (error) {
4339         case -NFS4ERR_ADMIN_REVOKED:
4340         case -NFS4ERR_BAD_STATEID:
4341                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4342                 if (new_lock_owner != 0 ||
4343                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4344                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4345                 break;
4346         case -NFS4ERR_STALE_STATEID:
4347                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4348         case -NFS4ERR_EXPIRED:
4349                 nfs4_schedule_lease_recovery(server->nfs_client);
4350         };
4351 }
4352
4353 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4354 {
4355         struct nfs4_lockdata *data;
4356         struct rpc_task *task;
4357         struct rpc_message msg = {
4358                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4359                 .rpc_cred = state->owner->so_cred,
4360         };
4361         struct rpc_task_setup task_setup_data = {
4362                 .rpc_client = NFS_CLIENT(state->inode),
4363                 .rpc_message = &msg,
4364                 .callback_ops = &nfs4_lock_ops,
4365                 .workqueue = nfsiod_workqueue,
4366                 .flags = RPC_TASK_ASYNC,
4367         };
4368         int ret;
4369
4370         dprintk("%s: begin!\n", __func__);
4371         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4372                         fl->fl_u.nfs4_fl.owner,
4373                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4374         if (data == NULL)
4375                 return -ENOMEM;
4376         if (IS_SETLKW(cmd))
4377                 data->arg.block = 1;
4378         if (recovery_type > NFS_LOCK_NEW) {
4379                 if (recovery_type == NFS_LOCK_RECLAIM)
4380                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4381                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4382         }
4383         msg.rpc_argp = &data->arg;
4384         msg.rpc_resp = &data->res;
4385         task_setup_data.callback_data = data;
4386         task = rpc_run_task(&task_setup_data);
4387         if (IS_ERR(task))
4388                 return PTR_ERR(task);
4389         ret = nfs4_wait_for_completion_rpc_task(task);
4390         if (ret == 0) {
4391                 ret = data->rpc_status;
4392                 if (ret)
4393                         nfs4_handle_setlk_error(data->server, data->lsp,
4394                                         data->arg.new_lock_owner, ret);
4395         } else
4396                 data->cancelled = 1;
4397         rpc_put_task(task);
4398         dprintk("%s: done, ret = %d!\n", __func__, ret);
4399         return ret;
4400 }
4401
4402 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4403 {
4404         struct nfs_server *server = NFS_SERVER(state->inode);
4405         struct nfs4_exception exception = { };
4406         int err;
4407
4408         do {
4409                 /* Cache the lock if possible... */
4410                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4411                         return 0;
4412                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4413                 if (err != -NFS4ERR_DELAY)
4414                         break;
4415                 nfs4_handle_exception(server, err, &exception);
4416         } while (exception.retry);
4417         return err;
4418 }
4419
4420 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4421 {
4422         struct nfs_server *server = NFS_SERVER(state->inode);
4423         struct nfs4_exception exception = { };
4424         int err;
4425
4426         err = nfs4_set_lock_state(state, request);
4427         if (err != 0)
4428                 return err;
4429         do {
4430                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4431                         return 0;
4432                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4433                 switch (err) {
4434                 default:
4435                         goto out;
4436                 case -NFS4ERR_GRACE:
4437                 case -NFS4ERR_DELAY:
4438                         nfs4_handle_exception(server, err, &exception);
4439                         err = 0;
4440                 }
4441         } while (exception.retry);
4442 out:
4443         return err;
4444 }
4445
4446 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4447 {
4448         struct nfs_inode *nfsi = NFS_I(state->inode);
4449         unsigned char fl_flags = request->fl_flags;
4450         int status = -ENOLCK;
4451
4452         if ((fl_flags & FL_POSIX) &&
4453                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4454                 goto out;
4455         /* Is this a delegated open? */
4456         status = nfs4_set_lock_state(state, request);
4457         if (status != 0)
4458                 goto out;
4459         request->fl_flags |= FL_ACCESS;
4460         status = do_vfs_lock(request->fl_file, request);
4461         if (status < 0)
4462                 goto out;
4463         down_read(&nfsi->rwsem);
4464         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4465                 /* Yes: cache locks! */
4466                 /* ...but avoid races with delegation recall... */
4467                 request->fl_flags = fl_flags & ~FL_SLEEP;
4468                 status = do_vfs_lock(request->fl_file, request);
4469                 goto out_unlock;
4470         }
4471         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4472         if (status != 0)
4473                 goto out_unlock;
4474         /* Note: we always want to sleep here! */
4475         request->fl_flags = fl_flags | FL_SLEEP;
4476         if (do_vfs_lock(request->fl_file, request) < 0)
4477                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4478 out_unlock:
4479         up_read(&nfsi->rwsem);
4480 out:
4481         request->fl_flags = fl_flags;
4482         return status;
4483 }
4484
4485 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4486 {
4487         struct nfs4_exception exception = { };
4488         int err;
4489
4490         do {
4491                 err = _nfs4_proc_setlk(state, cmd, request);
4492                 if (err == -NFS4ERR_DENIED)
4493                         err = -EAGAIN;
4494                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4495                                 err, &exception);
4496         } while (exception.retry);
4497         return err;
4498 }
4499
4500 static int
4501 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4502 {
4503         struct nfs_open_context *ctx;
4504         struct nfs4_state *state;
4505         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4506         int status;
4507
4508         /* verify open state */
4509         ctx = nfs_file_open_context(filp);
4510         state = ctx->state;
4511
4512         if (request->fl_start < 0 || request->fl_end < 0)
4513                 return -EINVAL;
4514
4515         if (IS_GETLK(cmd)) {
4516                 if (state != NULL)
4517                         return nfs4_proc_getlk(state, F_GETLK, request);
4518                 return 0;
4519         }
4520
4521         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4522                 return -EINVAL;
4523
4524         if (request->fl_type == F_UNLCK) {
4525                 if (state != NULL)
4526                         return nfs4_proc_unlck(state, cmd, request);
4527                 return 0;
4528         }
4529
4530         if (state == NULL)
4531                 return -ENOLCK;
4532         do {
4533                 status = nfs4_proc_setlk(state, cmd, request);
4534                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4535                         break;
4536                 timeout = nfs4_set_lock_task_retry(timeout);
4537                 status = -ERESTARTSYS;
4538                 if (signalled())
4539                         break;
4540         } while(status < 0);
4541         return status;
4542 }
4543
4544 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4545 {
4546         struct nfs_server *server = NFS_SERVER(state->inode);
4547         struct nfs4_exception exception = { };
4548         int err;
4549
4550         err = nfs4_set_lock_state(state, fl);
4551         if (err != 0)
4552                 goto out;
4553         do {
4554                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4555                 switch (err) {
4556                         default:
4557                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4558                                                 __func__, err);
4559                         case 0:
4560                         case -ESTALE:
4561                                 goto out;
4562                         case -NFS4ERR_EXPIRED:
4563                                 nfs4_schedule_stateid_recovery(server, state);
4564                         case -NFS4ERR_STALE_CLIENTID:
4565                         case -NFS4ERR_STALE_STATEID:
4566                                 nfs4_schedule_lease_recovery(server->nfs_client);
4567                                 goto out;
4568                         case -NFS4ERR_BADSESSION:
4569                         case -NFS4ERR_BADSLOT:
4570                         case -NFS4ERR_BAD_HIGH_SLOT:
4571                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4572                         case -NFS4ERR_DEADSESSION:
4573                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4574                                 goto out;
4575                         case -ERESTARTSYS:
4576                                 /*
4577                                  * The show must go on: exit, but mark the
4578                                  * stateid as needing recovery.
4579                                  */
4580                         case -NFS4ERR_ADMIN_REVOKED:
4581                         case -NFS4ERR_BAD_STATEID:
4582                         case -NFS4ERR_OPENMODE:
4583                                 nfs4_schedule_stateid_recovery(server, state);
4584                                 err = 0;
4585                                 goto out;
4586                         case -EKEYEXPIRED:
4587                                 /*
4588                                  * User RPCSEC_GSS context has expired.
4589                                  * We cannot recover this stateid now, so
4590                                  * skip it and allow recovery thread to
4591                                  * proceed.
4592                                  */
4593                                 err = 0;
4594                                 goto out;
4595                         case -ENOMEM:
4596                         case -NFS4ERR_DENIED:
4597                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4598                                 err = 0;
4599                                 goto out;
4600                         case -NFS4ERR_DELAY:
4601                                 break;
4602                 }
4603                 err = nfs4_handle_exception(server, err, &exception);
4604         } while (exception.retry);
4605 out:
4606         return err;
4607 }
4608
4609 static void nfs4_release_lockowner_release(void *calldata)
4610 {
4611         kfree(calldata);
4612 }
4613
4614 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4615         .rpc_release = nfs4_release_lockowner_release,
4616 };
4617
4618 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4619 {
4620         struct nfs_server *server = lsp->ls_state->owner->so_server;
4621         struct nfs_release_lockowner_args *args;
4622         struct rpc_message msg = {
4623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4624         };
4625
4626         if (server->nfs_client->cl_mvops->minor_version != 0)
4627                 return;
4628         args = kmalloc(sizeof(*args), GFP_NOFS);
4629         if (!args)
4630                 return;
4631         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4632         args->lock_owner.id = lsp->ls_id.id;
4633         args->lock_owner.s_dev = server->s_dev;
4634         msg.rpc_argp = args;
4635         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4636 }
4637
4638 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4639
4640 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4641                                    const void *buf, size_t buflen,
4642                                    int flags, int type)
4643 {
4644         if (strcmp(key, "") != 0)
4645                 return -EINVAL;
4646
4647         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4648 }
4649
4650 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4651                                    void *buf, size_t buflen, int type)
4652 {
4653         if (strcmp(key, "") != 0)
4654                 return -EINVAL;
4655
4656         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4657 }
4658
4659 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4660                                        size_t list_len, const char *name,
4661                                        size_t name_len, int type)
4662 {
4663         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4664
4665         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4666                 return 0;
4667
4668         if (list && len <= list_len)
4669                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4670         return len;
4671 }
4672
4673 /*
4674  * nfs_fhget will use either the mounted_on_fileid or the fileid
4675  */
4676 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4677 {
4678         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4679                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4680               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4681               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4682                 return;
4683
4684         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4685                 NFS_ATTR_FATTR_NLINK;
4686         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4687         fattr->nlink = 2;
4688 }
4689
4690 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4691                 struct nfs4_fs_locations *fs_locations, struct page *page)
4692 {
4693         struct nfs_server *server = NFS_SERVER(dir);
4694         u32 bitmask[2] = {
4695                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4696         };
4697         struct nfs4_fs_locations_arg args = {
4698                 .dir_fh = NFS_FH(dir),
4699                 .name = name,
4700                 .page = page,
4701                 .bitmask = bitmask,
4702         };
4703         struct nfs4_fs_locations_res res = {
4704                 .fs_locations = fs_locations,
4705         };
4706         struct rpc_message msg = {
4707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4708                 .rpc_argp = &args,
4709                 .rpc_resp = &res,
4710         };
4711         int status;
4712
4713         dprintk("%s: start\n", __func__);
4714
4715         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4716          * is not supported */
4717         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4718                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4719         else
4720                 bitmask[0] |= FATTR4_WORD0_FILEID;
4721
4722         nfs_fattr_init(&fs_locations->fattr);
4723         fs_locations->server = server;
4724         fs_locations->nlocations = 0;
4725         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4726         dprintk("%s: returned status = %d\n", __func__, status);
4727         return status;
4728 }
4729
4730 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4731 {
4732         int status;
4733         struct nfs4_secinfo_arg args = {
4734                 .dir_fh = NFS_FH(dir),
4735                 .name   = name,
4736         };
4737         struct nfs4_secinfo_res res = {
4738                 .flavors     = flavors,
4739         };
4740         struct rpc_message msg = {
4741                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4742                 .rpc_argp = &args,
4743                 .rpc_resp = &res,
4744         };
4745
4746         dprintk("NFS call  secinfo %s\n", name->name);
4747         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4748         dprintk("NFS reply  secinfo: %d\n", status);
4749         return status;
4750 }
4751
4752 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4753 {
4754         struct nfs4_exception exception = { };
4755         int err;
4756         do {
4757                 err = nfs4_handle_exception(NFS_SERVER(dir),
4758                                 _nfs4_proc_secinfo(dir, name, flavors),
4759                                 &exception);
4760         } while (exception.retry);
4761         return err;
4762 }
4763
4764 #ifdef CONFIG_NFS_V4_1
4765 /*
4766  * Check the exchange flags returned by the server for invalid flags, having
4767  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4768  * DS flags set.
4769  */
4770 static int nfs4_check_cl_exchange_flags(u32 flags)
4771 {
4772         if (flags & ~EXCHGID4_FLAG_MASK_R)
4773                 goto out_inval;
4774         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4775             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4776                 goto out_inval;
4777         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4778                 goto out_inval;
4779         return NFS_OK;
4780 out_inval:
4781         return -NFS4ERR_INVAL;
4782 }
4783
4784 /*
4785  * nfs4_proc_exchange_id()
4786  *
4787  * Since the clientid has expired, all compounds using sessions
4788  * associated with the stale clientid will be returning
4789  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4790  * be in some phase of session reset.
4791  */
4792 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4793 {
4794         nfs4_verifier verifier;
4795         struct nfs41_exchange_id_args args = {
4796                 .client = clp,
4797                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4798         };
4799         struct nfs41_exchange_id_res res = {
4800                 .client = clp,
4801         };
4802         int status;
4803         struct rpc_message msg = {
4804                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4805                 .rpc_argp = &args,
4806                 .rpc_resp = &res,
4807                 .rpc_cred = cred,
4808         };
4809         __be32 *p;
4810
4811         dprintk("--> %s\n", __func__);
4812         BUG_ON(clp == NULL);
4813
4814         p = (u32 *)verifier.data;
4815         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4816         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4817         args.verifier = &verifier;
4818
4819         args.id_len = scnprintf(args.id, sizeof(args.id),
4820                                 "%s/%s.%s/%u",
4821                                 clp->cl_ipaddr,
4822                                 init_utsname()->nodename,
4823                                 init_utsname()->domainname,
4824                                 clp->cl_rpcclient->cl_auth->au_flavor);
4825
4826         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4827         if (!status)
4828                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4829         dprintk("<-- %s status= %d\n", __func__, status);
4830         return status;
4831 }
4832
4833 struct nfs4_get_lease_time_data {
4834         struct nfs4_get_lease_time_args *args;
4835         struct nfs4_get_lease_time_res *res;
4836         struct nfs_client *clp;
4837 };
4838
4839 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4840                                         void *calldata)
4841 {
4842         int ret;
4843         struct nfs4_get_lease_time_data *data =
4844                         (struct nfs4_get_lease_time_data *)calldata;
4845
4846         dprintk("--> %s\n", __func__);
4847         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4848         /* just setup sequence, do not trigger session recovery
4849            since we're invoked within one */
4850         ret = nfs41_setup_sequence(data->clp->cl_session,
4851                                    &data->args->la_seq_args,
4852                                    &data->res->lr_seq_res, 0, task);
4853
4854         BUG_ON(ret == -EAGAIN);
4855         rpc_call_start(task);
4856         dprintk("<-- %s\n", __func__);
4857 }
4858
4859 /*
4860  * Called from nfs4_state_manager thread for session setup, so don't recover
4861  * from sequence operation or clientid errors.
4862  */
4863 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4864 {
4865         struct nfs4_get_lease_time_data *data =
4866                         (struct nfs4_get_lease_time_data *)calldata;
4867
4868         dprintk("--> %s\n", __func__);
4869         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4870                 return;
4871         switch (task->tk_status) {
4872         case -NFS4ERR_DELAY:
4873         case -NFS4ERR_GRACE:
4874                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4875                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4876                 task->tk_status = 0;
4877                 /* fall through */
4878         case -NFS4ERR_RETRY_UNCACHED_REP:
4879                 nfs_restart_rpc(task, data->clp);
4880                 return;
4881         }
4882         dprintk("<-- %s\n", __func__);
4883 }
4884
4885 struct rpc_call_ops nfs4_get_lease_time_ops = {
4886         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4887         .rpc_call_done = nfs4_get_lease_time_done,
4888 };
4889
4890 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4891 {
4892         struct rpc_task *task;
4893         struct nfs4_get_lease_time_args args;
4894         struct nfs4_get_lease_time_res res = {
4895                 .lr_fsinfo = fsinfo,
4896         };
4897         struct nfs4_get_lease_time_data data = {
4898                 .args = &args,
4899                 .res = &res,
4900                 .clp = clp,
4901         };
4902         struct rpc_message msg = {
4903                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4904                 .rpc_argp = &args,
4905                 .rpc_resp = &res,
4906         };
4907         struct rpc_task_setup task_setup = {
4908                 .rpc_client = clp->cl_rpcclient,
4909                 .rpc_message = &msg,
4910                 .callback_ops = &nfs4_get_lease_time_ops,
4911                 .callback_data = &data,
4912                 .flags = RPC_TASK_TIMEOUT,
4913         };
4914         int status;
4915
4916         dprintk("--> %s\n", __func__);
4917         task = rpc_run_task(&task_setup);
4918
4919         if (IS_ERR(task))
4920                 status = PTR_ERR(task);
4921         else {
4922                 status = task->tk_status;
4923                 rpc_put_task(task);
4924         }
4925         dprintk("<-- %s return %d\n", __func__, status);
4926
4927         return status;
4928 }
4929
4930 /*
4931  * Reset a slot table
4932  */
4933 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4934                                  int ivalue)
4935 {
4936         struct nfs4_slot *new = NULL;
4937         int i;
4938         int ret = 0;
4939
4940         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4941                 max_reqs, tbl->max_slots);
4942
4943         /* Does the newly negotiated max_reqs match the existing slot table? */
4944         if (max_reqs != tbl->max_slots) {
4945                 ret = -ENOMEM;
4946                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4947                               GFP_NOFS);
4948                 if (!new)
4949                         goto out;
4950                 ret = 0;
4951                 kfree(tbl->slots);
4952         }
4953         spin_lock(&tbl->slot_tbl_lock);
4954         if (new) {
4955                 tbl->slots = new;
4956                 tbl->max_slots = max_reqs;
4957         }
4958         for (i = 0; i < tbl->max_slots; ++i)
4959                 tbl->slots[i].seq_nr = ivalue;
4960         spin_unlock(&tbl->slot_tbl_lock);
4961         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4962                 tbl, tbl->slots, tbl->max_slots);
4963 out:
4964         dprintk("<-- %s: return %d\n", __func__, ret);
4965         return ret;
4966 }
4967
4968 /*
4969  * Reset the forechannel and backchannel slot tables
4970  */
4971 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4972 {
4973         int status;
4974
4975         status = nfs4_reset_slot_table(&session->fc_slot_table,
4976                         session->fc_attrs.max_reqs, 1);
4977         if (status)
4978                 return status;
4979
4980         status = nfs4_reset_slot_table(&session->bc_slot_table,
4981                         session->bc_attrs.max_reqs, 0);
4982         return status;
4983 }
4984
4985 /* Destroy the slot table */
4986 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4987 {
4988         if (session->fc_slot_table.slots != NULL) {
4989                 kfree(session->fc_slot_table.slots);
4990                 session->fc_slot_table.slots = NULL;
4991         }
4992         if (session->bc_slot_table.slots != NULL) {
4993                 kfree(session->bc_slot_table.slots);
4994                 session->bc_slot_table.slots = NULL;
4995         }
4996         return;
4997 }
4998
4999 /*
5000  * Initialize slot table
5001  */
5002 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5003                 int max_slots, int ivalue)
5004 {
5005         struct nfs4_slot *slot;
5006         int ret = -ENOMEM;
5007
5008         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5009
5010         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5011
5012         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5013         if (!slot)
5014                 goto out;
5015         ret = 0;
5016
5017         spin_lock(&tbl->slot_tbl_lock);
5018         tbl->max_slots = max_slots;
5019         tbl->slots = slot;
5020         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5021         spin_unlock(&tbl->slot_tbl_lock);
5022         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5023                 tbl, tbl->slots, tbl->max_slots);
5024 out:
5025         dprintk("<-- %s: return %d\n", __func__, ret);
5026         return ret;
5027 }
5028
5029 /*
5030  * Initialize the forechannel and backchannel tables
5031  */
5032 static int nfs4_init_slot_tables(struct nfs4_session *session)
5033 {
5034         struct nfs4_slot_table *tbl;
5035         int status = 0;
5036
5037         tbl = &session->fc_slot_table;
5038         if (tbl->slots == NULL) {
5039                 status = nfs4_init_slot_table(tbl,
5040                                 session->fc_attrs.max_reqs, 1);
5041                 if (status)
5042                         return status;
5043         }
5044
5045         tbl = &session->bc_slot_table;
5046         if (tbl->slots == NULL) {
5047                 status = nfs4_init_slot_table(tbl,
5048                                 session->bc_attrs.max_reqs, 0);
5049                 if (status)
5050                         nfs4_destroy_slot_tables(session);
5051         }
5052
5053         return status;
5054 }
5055
5056 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5057 {
5058         struct nfs4_session *session;
5059         struct nfs4_slot_table *tbl;
5060
5061         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5062         if (!session)
5063                 return NULL;
5064
5065         tbl = &session->fc_slot_table;
5066         tbl->highest_used_slotid = -1;
5067         spin_lock_init(&tbl->slot_tbl_lock);
5068         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5069         init_completion(&tbl->complete);
5070
5071         tbl = &session->bc_slot_table;
5072         tbl->highest_used_slotid = -1;
5073         spin_lock_init(&tbl->slot_tbl_lock);
5074         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5075         init_completion(&tbl->complete);
5076
5077         session->session_state = 1<<NFS4_SESSION_INITING;
5078
5079         session->clp = clp;
5080         return session;
5081 }
5082
5083 void nfs4_destroy_session(struct nfs4_session *session)
5084 {
5085         nfs4_proc_destroy_session(session);
5086         dprintk("%s Destroy backchannel for xprt %p\n",
5087                 __func__, session->clp->cl_rpcclient->cl_xprt);
5088         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5089                                 NFS41_BC_MIN_CALLBACKS);
5090         nfs4_destroy_slot_tables(session);
5091         kfree(session);
5092 }
5093
5094 /*
5095  * Initialize the values to be used by the client in CREATE_SESSION
5096  * If nfs4_init_session set the fore channel request and response sizes,
5097  * use them.
5098  *
5099  * Set the back channel max_resp_sz_cached to zero to force the client to
5100  * always set csa_cachethis to FALSE because the current implementation
5101  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5102  */
5103 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5104 {
5105         struct nfs4_session *session = args->client->cl_session;
5106         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5107                      mxresp_sz = session->fc_attrs.max_resp_sz;
5108
5109         if (mxrqst_sz == 0)
5110                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5111         if (mxresp_sz == 0)
5112                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5113         /* Fore channel attributes */
5114         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5115         args->fc_attrs.max_resp_sz = mxresp_sz;
5116         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5117         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5118
5119         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5120                 "max_ops=%u max_reqs=%u\n",
5121                 __func__,
5122                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5123                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5124
5125         /* Back channel attributes */
5126         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5127         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5128         args->bc_attrs.max_resp_sz_cached = 0;
5129         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5130         args->bc_attrs.max_reqs = 1;
5131
5132         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5133                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5134                 __func__,
5135                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5136                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5137                 args->bc_attrs.max_reqs);
5138 }
5139
5140 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5141 {
5142         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5143         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5144
5145         if (rcvd->max_resp_sz > sent->max_resp_sz)
5146                 return -EINVAL;
5147         /*
5148          * Our requested max_ops is the minimum we need; we're not
5149          * prepared to break up compounds into smaller pieces than that.
5150          * So, no point even trying to continue if the server won't
5151          * cooperate:
5152          */
5153         if (rcvd->max_ops < sent->max_ops)
5154                 return -EINVAL;
5155         if (rcvd->max_reqs == 0)
5156                 return -EINVAL;
5157         return 0;
5158 }
5159
5160 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5161 {
5162         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5163         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5164
5165         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5166                 return -EINVAL;
5167         if (rcvd->max_resp_sz < sent->max_resp_sz)
5168                 return -EINVAL;
5169         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5170                 return -EINVAL;
5171         /* These would render the backchannel useless: */
5172         if (rcvd->max_ops  == 0)
5173                 return -EINVAL;
5174         if (rcvd->max_reqs == 0)
5175                 return -EINVAL;
5176         return 0;
5177 }
5178
5179 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5180                                      struct nfs4_session *session)
5181 {
5182         int ret;
5183
5184         ret = nfs4_verify_fore_channel_attrs(args, session);
5185         if (ret)
5186                 return ret;
5187         return nfs4_verify_back_channel_attrs(args, session);
5188 }
5189
5190 static int _nfs4_proc_create_session(struct nfs_client *clp)
5191 {
5192         struct nfs4_session *session = clp->cl_session;
5193         struct nfs41_create_session_args args = {
5194                 .client = clp,
5195                 .cb_program = NFS4_CALLBACK,
5196         };
5197         struct nfs41_create_session_res res = {
5198                 .client = clp,
5199         };
5200         struct rpc_message msg = {
5201                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5202                 .rpc_argp = &args,
5203                 .rpc_resp = &res,
5204         };
5205         int status;
5206
5207         nfs4_init_channel_attrs(&args);
5208         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5209
5210         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5211
5212         if (!status)
5213                 /* Verify the session's negotiated channel_attrs values */
5214                 status = nfs4_verify_channel_attrs(&args, session);
5215         if (!status) {
5216                 /* Increment the clientid slot sequence id */
5217                 clp->cl_seqid++;
5218         }
5219
5220         return status;
5221 }
5222
5223 /*
5224  * Issues a CREATE_SESSION operation to the server.
5225  * It is the responsibility of the caller to verify the session is
5226  * expired before calling this routine.
5227  */
5228 int nfs4_proc_create_session(struct nfs_client *clp)
5229 {
5230         int status;
5231         unsigned *ptr;
5232         struct nfs4_session *session = clp->cl_session;
5233
5234         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5235
5236         status = _nfs4_proc_create_session(clp);
5237         if (status)
5238                 goto out;
5239
5240         /* Init and reset the fore channel */
5241         status = nfs4_init_slot_tables(session);
5242         dprintk("slot table initialization returned %d\n", status);
5243         if (status)
5244                 goto out;
5245         status = nfs4_reset_slot_tables(session);
5246         dprintk("slot table reset returned %d\n", status);
5247         if (status)
5248                 goto out;
5249
5250         ptr = (unsigned *)&session->sess_id.data[0];
5251         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5252                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5253 out:
5254         dprintk("<-- %s\n", __func__);
5255         return status;
5256 }
5257
5258 /*
5259  * Issue the over-the-wire RPC DESTROY_SESSION.
5260  * The caller must serialize access to this routine.
5261  */
5262 int nfs4_proc_destroy_session(struct nfs4_session *session)
5263 {
5264         int status = 0;
5265         struct rpc_message msg;
5266
5267         dprintk("--> nfs4_proc_destroy_session\n");
5268
5269         /* session is still being setup */
5270         if (session->clp->cl_cons_state != NFS_CS_READY)
5271                 return status;
5272
5273         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5274         msg.rpc_argp = session;
5275         msg.rpc_resp = NULL;
5276         msg.rpc_cred = NULL;
5277         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5278
5279         if (status)
5280                 printk(KERN_WARNING
5281                         "Got error %d from the server on DESTROY_SESSION. "
5282                         "Session has been destroyed regardless...\n", status);
5283
5284         dprintk("<-- nfs4_proc_destroy_session\n");
5285         return status;
5286 }
5287
5288 int nfs4_init_session(struct nfs_server *server)
5289 {
5290         struct nfs_client *clp = server->nfs_client;
5291         struct nfs4_session *session;
5292         unsigned int rsize, wsize;
5293         int ret;
5294
5295         if (!nfs4_has_session(clp))
5296                 return 0;
5297
5298         session = clp->cl_session;
5299         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5300                 return 0;
5301
5302         rsize = server->rsize;
5303         if (rsize == 0)
5304                 rsize = NFS_MAX_FILE_IO_SIZE;
5305         wsize = server->wsize;
5306         if (wsize == 0)
5307                 wsize = NFS_MAX_FILE_IO_SIZE;
5308
5309         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5310         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5311
5312         ret = nfs4_recover_expired_lease(server);
5313         if (!ret)
5314                 ret = nfs4_check_client_ready(clp);
5315         return ret;
5316 }
5317
5318 int nfs4_init_ds_session(struct nfs_client *clp)
5319 {
5320         struct nfs4_session *session = clp->cl_session;
5321         int ret;
5322
5323         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5324                 return 0;
5325
5326         ret = nfs4_client_recover_expired_lease(clp);
5327         if (!ret)
5328                 /* Test for the DS role */
5329                 if (!is_ds_client(clp))
5330                         ret = -ENODEV;
5331         if (!ret)
5332                 ret = nfs4_check_client_ready(clp);
5333         return ret;
5334
5335 }
5336 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5337
5338
5339 /*
5340  * Renew the cl_session lease.
5341  */
5342 struct nfs4_sequence_data {
5343         struct nfs_client *clp;
5344         struct nfs4_sequence_args args;
5345         struct nfs4_sequence_res res;
5346 };
5347
5348 static void nfs41_sequence_release(void *data)
5349 {
5350         struct nfs4_sequence_data *calldata = data;
5351         struct nfs_client *clp = calldata->clp;
5352
5353         if (atomic_read(&clp->cl_count) > 1)
5354                 nfs4_schedule_state_renewal(clp);
5355         nfs_put_client(clp);
5356         kfree(calldata);
5357 }
5358
5359 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5360 {
5361         switch(task->tk_status) {
5362         case -NFS4ERR_DELAY:
5363                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5364                 return -EAGAIN;
5365         default:
5366                 nfs4_schedule_lease_recovery(clp);
5367         }
5368         return 0;
5369 }
5370
5371 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5372 {
5373         struct nfs4_sequence_data *calldata = data;
5374         struct nfs_client *clp = calldata->clp;
5375
5376         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5377                 return;
5378
5379         if (task->tk_status < 0) {
5380                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5381                 if (atomic_read(&clp->cl_count) == 1)
5382                         goto out;
5383
5384                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5385                         rpc_restart_call_prepare(task);
5386                         return;
5387                 }
5388         }
5389         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5390 out:
5391         dprintk("<-- %s\n", __func__);
5392 }
5393
5394 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5395 {
5396         struct nfs4_sequence_data *calldata = data;
5397         struct nfs_client *clp = calldata->clp;
5398         struct nfs4_sequence_args *args;
5399         struct nfs4_sequence_res *res;
5400
5401         args = task->tk_msg.rpc_argp;
5402         res = task->tk_msg.rpc_resp;
5403
5404         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5405                 return;
5406         rpc_call_start(task);
5407 }
5408
5409 static const struct rpc_call_ops nfs41_sequence_ops = {
5410         .rpc_call_done = nfs41_sequence_call_done,
5411         .rpc_call_prepare = nfs41_sequence_prepare,
5412         .rpc_release = nfs41_sequence_release,
5413 };
5414
5415 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5416 {
5417         struct nfs4_sequence_data *calldata;
5418         struct rpc_message msg = {
5419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5420                 .rpc_cred = cred,
5421         };
5422         struct rpc_task_setup task_setup_data = {
5423                 .rpc_client = clp->cl_rpcclient,
5424                 .rpc_message = &msg,
5425                 .callback_ops = &nfs41_sequence_ops,
5426                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5427         };
5428
5429         if (!atomic_inc_not_zero(&clp->cl_count))
5430                 return ERR_PTR(-EIO);
5431         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5432         if (calldata == NULL) {
5433                 nfs_put_client(clp);
5434                 return ERR_PTR(-ENOMEM);
5435         }
5436         msg.rpc_argp = &calldata->args;
5437         msg.rpc_resp = &calldata->res;
5438         calldata->clp = clp;
5439         task_setup_data.callback_data = calldata;
5440
5441         return rpc_run_task(&task_setup_data);
5442 }
5443
5444 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5445 {
5446         struct rpc_task *task;
5447         int ret = 0;
5448
5449         task = _nfs41_proc_sequence(clp, cred);
5450         if (IS_ERR(task))
5451                 ret = PTR_ERR(task);
5452         else
5453                 rpc_put_task_async(task);
5454         dprintk("<-- %s status=%d\n", __func__, ret);
5455         return ret;
5456 }
5457
5458 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5459 {
5460         struct rpc_task *task;
5461         int ret;
5462
5463         task = _nfs41_proc_sequence(clp, cred);
5464         if (IS_ERR(task)) {
5465                 ret = PTR_ERR(task);
5466                 goto out;
5467         }
5468         ret = rpc_wait_for_completion_task(task);
5469         if (!ret) {
5470                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5471
5472                 if (task->tk_status == 0)
5473                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5474                 ret = task->tk_status;
5475         }
5476         rpc_put_task(task);
5477 out:
5478         dprintk("<-- %s status=%d\n", __func__, ret);
5479         return ret;
5480 }
5481
5482 struct nfs4_reclaim_complete_data {
5483         struct nfs_client *clp;
5484         struct nfs41_reclaim_complete_args arg;
5485         struct nfs41_reclaim_complete_res res;
5486 };
5487
5488 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5489 {
5490         struct nfs4_reclaim_complete_data *calldata = data;
5491
5492         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5493         if (nfs41_setup_sequence(calldata->clp->cl_session,
5494                                 &calldata->arg.seq_args,
5495                                 &calldata->res.seq_res, 0, task))
5496                 return;
5497
5498         rpc_call_start(task);
5499 }
5500
5501 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5502 {
5503         switch(task->tk_status) {
5504         case 0:
5505         case -NFS4ERR_COMPLETE_ALREADY:
5506         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5507                 break;
5508         case -NFS4ERR_DELAY:
5509                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5510                 /* fall through */
5511         case -NFS4ERR_RETRY_UNCACHED_REP:
5512                 return -EAGAIN;
5513         default:
5514                 nfs4_schedule_lease_recovery(clp);
5515         }
5516         return 0;
5517 }
5518
5519 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5520 {
5521         struct nfs4_reclaim_complete_data *calldata = data;
5522         struct nfs_client *clp = calldata->clp;
5523         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5524
5525         dprintk("--> %s\n", __func__);
5526         if (!nfs41_sequence_done(task, res))
5527                 return;
5528
5529         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5530                 rpc_restart_call_prepare(task);
5531                 return;
5532         }
5533         dprintk("<-- %s\n", __func__);
5534 }
5535
5536 static void nfs4_free_reclaim_complete_data(void *data)
5537 {
5538         struct nfs4_reclaim_complete_data *calldata = data;
5539
5540         kfree(calldata);
5541 }
5542
5543 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5544         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5545         .rpc_call_done = nfs4_reclaim_complete_done,
5546         .rpc_release = nfs4_free_reclaim_complete_data,
5547 };
5548
5549 /*
5550  * Issue a global reclaim complete.
5551  */
5552 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5553 {
5554         struct nfs4_reclaim_complete_data *calldata;
5555         struct rpc_task *task;
5556         struct rpc_message msg = {
5557                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5558         };
5559         struct rpc_task_setup task_setup_data = {
5560                 .rpc_client = clp->cl_rpcclient,
5561                 .rpc_message = &msg,
5562                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5563                 .flags = RPC_TASK_ASYNC,
5564         };
5565         int status = -ENOMEM;
5566
5567         dprintk("--> %s\n", __func__);
5568         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5569         if (calldata == NULL)
5570                 goto out;
5571         calldata->clp = clp;
5572         calldata->arg.one_fs = 0;
5573
5574         msg.rpc_argp = &calldata->arg;
5575         msg.rpc_resp = &calldata->res;
5576         task_setup_data.callback_data = calldata;
5577         task = rpc_run_task(&task_setup_data);
5578         if (IS_ERR(task)) {
5579                 status = PTR_ERR(task);
5580                 goto out;
5581         }
5582         status = nfs4_wait_for_completion_rpc_task(task);
5583         if (status == 0)
5584                 status = task->tk_status;
5585         rpc_put_task(task);
5586         return 0;
5587 out:
5588         dprintk("<-- %s status=%d\n", __func__, status);
5589         return status;
5590 }
5591
5592 static void
5593 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5594 {
5595         struct nfs4_layoutget *lgp = calldata;
5596         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5597
5598         dprintk("--> %s\n", __func__);
5599         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5600          * right now covering the LAYOUTGET we are about to send.
5601          * However, that is not so catastrophic, and there seems
5602          * to be no way to prevent it completely.
5603          */
5604         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5605                                 &lgp->res.seq_res, 0, task))
5606                 return;
5607         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5608                                           NFS_I(lgp->args.inode)->layout,
5609                                           lgp->args.ctx->state)) {
5610                 rpc_exit(task, NFS4_OK);
5611                 return;
5612         }
5613         rpc_call_start(task);
5614 }
5615
5616 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5617 {
5618         struct nfs4_layoutget *lgp = calldata;
5619         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5620
5621         dprintk("--> %s\n", __func__);
5622
5623         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5624                 return;
5625
5626         switch (task->tk_status) {
5627         case 0:
5628                 break;
5629         case -NFS4ERR_LAYOUTTRYLATER:
5630         case -NFS4ERR_RECALLCONFLICT:
5631                 task->tk_status = -NFS4ERR_DELAY;
5632                 /* Fall through */
5633         default:
5634                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5635                         rpc_restart_call_prepare(task);
5636                         return;
5637                 }
5638         }
5639         dprintk("<-- %s\n", __func__);
5640 }
5641
5642 static void nfs4_layoutget_release(void *calldata)
5643 {
5644         struct nfs4_layoutget *lgp = calldata;
5645
5646         dprintk("--> %s\n", __func__);
5647         put_nfs_open_context(lgp->args.ctx);
5648         kfree(calldata);
5649         dprintk("<-- %s\n", __func__);
5650 }
5651
5652 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5653         .rpc_call_prepare = nfs4_layoutget_prepare,
5654         .rpc_call_done = nfs4_layoutget_done,
5655         .rpc_release = nfs4_layoutget_release,
5656 };
5657
5658 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5659 {
5660         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5661         struct rpc_task *task;
5662         struct rpc_message msg = {
5663                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5664                 .rpc_argp = &lgp->args,
5665                 .rpc_resp = &lgp->res,
5666         };
5667         struct rpc_task_setup task_setup_data = {
5668                 .rpc_client = server->client,
5669                 .rpc_message = &msg,
5670                 .callback_ops = &nfs4_layoutget_call_ops,
5671                 .callback_data = lgp,
5672                 .flags = RPC_TASK_ASYNC,
5673         };
5674         int status = 0;
5675
5676         dprintk("--> %s\n", __func__);
5677
5678         lgp->res.layoutp = &lgp->args.layout;
5679         lgp->res.seq_res.sr_slot = NULL;
5680         task = rpc_run_task(&task_setup_data);
5681         if (IS_ERR(task))
5682                 return PTR_ERR(task);
5683         status = nfs4_wait_for_completion_rpc_task(task);
5684         if (status == 0)
5685                 status = task->tk_status;
5686         if (status == 0)
5687                 status = pnfs_layout_process(lgp);
5688         rpc_put_task(task);
5689         dprintk("<-- %s status=%d\n", __func__, status);
5690         return status;
5691 }
5692
5693 static void
5694 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5695 {
5696         struct nfs4_layoutreturn *lrp = calldata;
5697
5698         dprintk("--> %s\n", __func__);
5699         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5700                                 &lrp->res.seq_res, 0, task))
5701                 return;
5702         rpc_call_start(task);
5703 }
5704
5705 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5706 {
5707         struct nfs4_layoutreturn *lrp = calldata;
5708         struct nfs_server *server;
5709         struct pnfs_layout_hdr *lo = NFS_I(lrp->args.inode)->layout;
5710
5711         dprintk("--> %s\n", __func__);
5712
5713         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5714                 return;
5715
5716         server = NFS_SERVER(lrp->args.inode);
5717         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5718                 nfs_restart_rpc(task, lrp->clp);
5719                 return;
5720         }
5721         spin_lock(&lo->plh_inode->i_lock);
5722         if (task->tk_status == 0) {
5723                 if (lrp->res.lrs_present) {
5724                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5725                 } else
5726                         BUG_ON(!list_empty(&lo->plh_segs));
5727         }
5728         lo->plh_block_lgets--;
5729         spin_unlock(&lo->plh_inode->i_lock);
5730         dprintk("<-- %s\n", __func__);
5731 }
5732
5733 static void nfs4_layoutreturn_release(void *calldata)
5734 {
5735         struct nfs4_layoutreturn *lrp = calldata;
5736
5737         dprintk("--> %s\n", __func__);
5738         put_layout_hdr(NFS_I(lrp->args.inode)->layout);
5739         kfree(calldata);
5740         dprintk("<-- %s\n", __func__);
5741 }
5742
5743 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5744         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5745         .rpc_call_done = nfs4_layoutreturn_done,
5746         .rpc_release = nfs4_layoutreturn_release,
5747 };
5748
5749 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5750 {
5751         struct rpc_task *task;
5752         struct rpc_message msg = {
5753                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5754                 .rpc_argp = &lrp->args,
5755                 .rpc_resp = &lrp->res,
5756         };
5757         struct rpc_task_setup task_setup_data = {
5758                 .rpc_client = lrp->clp->cl_rpcclient,
5759                 .rpc_message = &msg,
5760                 .callback_ops = &nfs4_layoutreturn_call_ops,
5761                 .callback_data = lrp,
5762         };
5763         int status;
5764
5765         dprintk("--> %s\n", __func__);
5766         task = rpc_run_task(&task_setup_data);
5767         if (IS_ERR(task))
5768                 return PTR_ERR(task);
5769         status = task->tk_status;
5770         dprintk("<-- %s status=%d\n", __func__, status);
5771         rpc_put_task(task);
5772         return status;
5773 }
5774
5775 static int
5776 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5777 {
5778         struct nfs4_getdeviceinfo_args args = {
5779                 .pdev = pdev,
5780         };
5781         struct nfs4_getdeviceinfo_res res = {
5782                 .pdev = pdev,
5783         };
5784         struct rpc_message msg = {
5785                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5786                 .rpc_argp = &args,
5787                 .rpc_resp = &res,
5788         };
5789         int status;
5790
5791         dprintk("--> %s\n", __func__);
5792         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5793         dprintk("<-- %s status=%d\n", __func__, status);
5794
5795         return status;
5796 }
5797
5798 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5799 {
5800         struct nfs4_exception exception = { };
5801         int err;
5802
5803         do {
5804                 err = nfs4_handle_exception(server,
5805                                         _nfs4_proc_getdeviceinfo(server, pdev),
5806                                         &exception);
5807         } while (exception.retry);
5808         return err;
5809 }
5810 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5811
5812 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5813 {
5814         struct nfs4_layoutcommit_data *data = calldata;
5815         struct nfs_server *server = NFS_SERVER(data->args.inode);
5816
5817         if (nfs4_setup_sequence(server, &data->args.seq_args,
5818                                 &data->res.seq_res, 1, task))
5819                 return;
5820         rpc_call_start(task);
5821 }
5822
5823 static void
5824 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5825 {
5826         struct nfs4_layoutcommit_data *data = calldata;
5827         struct nfs_server *server = NFS_SERVER(data->args.inode);
5828
5829         if (!nfs4_sequence_done(task, &data->res.seq_res))
5830                 return;
5831
5832         switch (task->tk_status) { /* Just ignore these failures */
5833         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5834         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5835         case NFS4ERR_BADLAYOUT:     /* no layout */
5836         case NFS4ERR_GRACE:         /* loca_recalim always false */
5837                 task->tk_status = 0;
5838         }
5839
5840         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5841                 nfs_restart_rpc(task, server->nfs_client);
5842                 return;
5843         }
5844
5845         if (task->tk_status == 0)
5846                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5847                                                    data->res.fattr);
5848 }
5849
5850 static void nfs4_layoutcommit_release(void *calldata)
5851 {
5852         struct nfs4_layoutcommit_data *data = calldata;
5853
5854         /* Matched by references in pnfs_set_layoutcommit */
5855         put_lseg(data->lseg);
5856         put_rpccred(data->cred);
5857         kfree(data);
5858 }
5859
5860 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5861         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5862         .rpc_call_done = nfs4_layoutcommit_done,
5863         .rpc_release = nfs4_layoutcommit_release,
5864 };
5865
5866 int
5867 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5868 {
5869         struct rpc_message msg = {
5870                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5871                 .rpc_argp = &data->args,
5872                 .rpc_resp = &data->res,
5873                 .rpc_cred = data->cred,
5874         };
5875         struct rpc_task_setup task_setup_data = {
5876                 .task = &data->task,
5877                 .rpc_client = NFS_CLIENT(data->args.inode),
5878                 .rpc_message = &msg,
5879                 .callback_ops = &nfs4_layoutcommit_ops,
5880                 .callback_data = data,
5881                 .flags = RPC_TASK_ASYNC,
5882         };
5883         struct rpc_task *task;
5884         int status = 0;
5885
5886         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5887                 "lbw: %llu inode %lu\n",
5888                 data->task.tk_pid, sync,
5889                 data->args.lastbytewritten,
5890                 data->args.inode->i_ino);
5891
5892         task = rpc_run_task(&task_setup_data);
5893         if (IS_ERR(task))
5894                 return PTR_ERR(task);
5895         if (sync == false)
5896                 goto out;
5897         status = nfs4_wait_for_completion_rpc_task(task);
5898         if (status != 0)
5899                 goto out;
5900         status = task->tk_status;
5901 out:
5902         dprintk("%s: status %d\n", __func__, status);
5903         rpc_put_task(task);
5904         return status;
5905 }
5906 #endif /* CONFIG_NFS_V4_1 */
5907
5908 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5909         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5910         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5911         .recover_open   = nfs4_open_reclaim,
5912         .recover_lock   = nfs4_lock_reclaim,
5913         .establish_clid = nfs4_init_clientid,
5914         .get_clid_cred  = nfs4_get_setclientid_cred,
5915 };
5916
5917 #if defined(CONFIG_NFS_V4_1)
5918 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5919         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5920         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5921         .recover_open   = nfs4_open_reclaim,
5922         .recover_lock   = nfs4_lock_reclaim,
5923         .establish_clid = nfs41_init_clientid,
5924         .get_clid_cred  = nfs4_get_exchange_id_cred,
5925         .reclaim_complete = nfs41_proc_reclaim_complete,
5926 };
5927 #endif /* CONFIG_NFS_V4_1 */
5928
5929 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5930         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5931         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5932         .recover_open   = nfs4_open_expired,
5933         .recover_lock   = nfs4_lock_expired,
5934         .establish_clid = nfs4_init_clientid,
5935         .get_clid_cred  = nfs4_get_setclientid_cred,
5936 };
5937
5938 #if defined(CONFIG_NFS_V4_1)
5939 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5940         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5941         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5942         .recover_open   = nfs4_open_expired,
5943         .recover_lock   = nfs4_lock_expired,
5944         .establish_clid = nfs41_init_clientid,
5945         .get_clid_cred  = nfs4_get_exchange_id_cred,
5946 };
5947 #endif /* CONFIG_NFS_V4_1 */
5948
5949 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5950         .sched_state_renewal = nfs4_proc_async_renew,
5951         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5952         .renew_lease = nfs4_proc_renew,
5953 };
5954
5955 #if defined(CONFIG_NFS_V4_1)
5956 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5957         .sched_state_renewal = nfs41_proc_async_sequence,
5958         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5959         .renew_lease = nfs4_proc_sequence,
5960 };
5961 #endif
5962
5963 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5964         .minor_version = 0,
5965         .call_sync = _nfs4_call_sync,
5966         .validate_stateid = nfs4_validate_delegation_stateid,
5967         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5968         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5969         .state_renewal_ops = &nfs40_state_renewal_ops,
5970 };
5971
5972 #if defined(CONFIG_NFS_V4_1)
5973 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5974         .minor_version = 1,
5975         .call_sync = _nfs4_call_sync_session,
5976         .validate_stateid = nfs41_validate_delegation_stateid,
5977         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5978         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5979         .state_renewal_ops = &nfs41_state_renewal_ops,
5980 };
5981 #endif
5982
5983 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5984         [0] = &nfs_v4_0_minor_ops,
5985 #if defined(CONFIG_NFS_V4_1)
5986         [1] = &nfs_v4_1_minor_ops,
5987 #endif
5988 };
5989
5990 static const struct inode_operations nfs4_file_inode_operations = {
5991         .permission     = nfs_permission,
5992         .getattr        = nfs_getattr,
5993         .setattr        = nfs_setattr,
5994         .getxattr       = generic_getxattr,
5995         .setxattr       = generic_setxattr,
5996         .listxattr      = generic_listxattr,
5997         .removexattr    = generic_removexattr,
5998 };
5999
6000 const struct nfs_rpc_ops nfs_v4_clientops = {
6001         .version        = 4,                    /* protocol version */
6002         .dentry_ops     = &nfs4_dentry_operations,
6003         .dir_inode_ops  = &nfs4_dir_inode_operations,
6004         .file_inode_ops = &nfs4_file_inode_operations,
6005         .getroot        = nfs4_proc_get_root,
6006         .getattr        = nfs4_proc_getattr,
6007         .setattr        = nfs4_proc_setattr,
6008         .lookupfh       = nfs4_proc_lookupfh,
6009         .lookup         = nfs4_proc_lookup,
6010         .access         = nfs4_proc_access,
6011         .readlink       = nfs4_proc_readlink,
6012         .create         = nfs4_proc_create,
6013         .remove         = nfs4_proc_remove,
6014         .unlink_setup   = nfs4_proc_unlink_setup,
6015         .unlink_done    = nfs4_proc_unlink_done,
6016         .rename         = nfs4_proc_rename,
6017         .rename_setup   = nfs4_proc_rename_setup,
6018         .rename_done    = nfs4_proc_rename_done,
6019         .link           = nfs4_proc_link,
6020         .symlink        = nfs4_proc_symlink,
6021         .mkdir          = nfs4_proc_mkdir,
6022         .rmdir          = nfs4_proc_remove,
6023         .readdir        = nfs4_proc_readdir,
6024         .mknod          = nfs4_proc_mknod,
6025         .statfs         = nfs4_proc_statfs,
6026         .fsinfo         = nfs4_proc_fsinfo,
6027         .pathconf       = nfs4_proc_pathconf,
6028         .set_capabilities = nfs4_server_capabilities,
6029         .decode_dirent  = nfs4_decode_dirent,
6030         .read_setup     = nfs4_proc_read_setup,
6031         .read_done      = nfs4_read_done,
6032         .write_setup    = nfs4_proc_write_setup,
6033         .write_done     = nfs4_write_done,
6034         .commit_setup   = nfs4_proc_commit_setup,
6035         .commit_done    = nfs4_commit_done,
6036         .lock           = nfs4_proc_lock,
6037         .clear_acl_cache = nfs4_zap_acl_attr,
6038         .close_context  = nfs4_close_context,
6039         .open_context   = nfs4_atomic_open,
6040         .init_client    = nfs4_init_client,
6041         .secinfo        = nfs4_proc_secinfo,
6042 };
6043
6044 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6045         .prefix = XATTR_NAME_NFSV4_ACL,
6046         .list   = nfs4_xattr_list_nfs4_acl,
6047         .get    = nfs4_xattr_get_nfs4_acl,
6048         .set    = nfs4_xattr_set_nfs4_acl,
6049 };
6050
6051 const struct xattr_handler *nfs4_xattr_handlers[] = {
6052         &nfs4_xattr_nfs4_acl_handler,
6053         NULL
6054 };
6055
6056 /*
6057  * Local variables:
6058  *  c-basic-offset: 8
6059  * End:
6060  */