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/namei.h>
  50 #include <linux/mount.h>
  51 #include <linux/module.h>
  52 #include <linux/sunrpc/bc_xprt.h>
  53 #include <linux/xattr.h>
  54 #include <linux/utsname.h>
  55
  56 #include "nfs4_fs.h"
  57 #include "delegation.h"
  58 #include "internal.h"
  59 #include "iostat.h"
  60 #include "callback.h"
  61 #include "pnfs.h"
  62
  63 #define NFSDBG_FACILITY         NFSDBG_PROC
  64
  65 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  66 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  67
  68 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  69
  70 struct nfs4_opendata;
  71 static int _nfs4_proc_open(struct nfs4_opendata *data);
  72 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  73 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  74 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  75 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
  76                              const struct qstr *name, struct nfs_fh *fhandle,
  77                              struct nfs_fattr *fattr);
  78 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  79 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  80                             struct nfs_fattr *fattr, struct iattr *sattr,
  81                             struct nfs4_state *state);
  82
  83 /* Prevent leaks of NFSv4 errors into userland */
  84 static int nfs4_map_errors(int err)
  85 {
  86         if (err >= -1000)
  87                 return err;
  88         switch (err) {
  89         case -NFS4ERR_RESOURCE:
  90                 return -EREMOTEIO;
  91         case -NFS4ERR_WRONGSEC:
  92                 return -EPERM;
  93         case -NFS4ERR_BADOWNER:
  94         case -NFS4ERR_BADNAME:
  95                 return -EINVAL;
  96         default:
  97                 dprintk("%s could not handle NFSv4 error %d\n",
  98                                 __func__, -err);
  99                 break;
 100         }
 101         return -EIO;
 102 }
 103
 104 /*
 105  * This is our standard bitmap for GETATTR requests.
 106  */
 107 const u32 nfs4_fattr_bitmap[2] = {
 108         FATTR4_WORD0_TYPE
 109         | FATTR4_WORD0_CHANGE
 110         | FATTR4_WORD0_SIZE
 111         | FATTR4_WORD0_FSID
 112         | FATTR4_WORD0_FILEID,
 113         FATTR4_WORD1_MODE
 114         | FATTR4_WORD1_NUMLINKS
 115         | FATTR4_WORD1_OWNER
 116         | FATTR4_WORD1_OWNER_GROUP
 117         | FATTR4_WORD1_RAWDEV
 118         | FATTR4_WORD1_SPACE_USED
 119         | FATTR4_WORD1_TIME_ACCESS
 120         | FATTR4_WORD1_TIME_METADATA
 121         | FATTR4_WORD1_TIME_MODIFY
 122 };
 123
 124 const u32 nfs4_statfs_bitmap[2] = {
 125         FATTR4_WORD0_FILES_AVAIL
 126         | FATTR4_WORD0_FILES_FREE
 127         | FATTR4_WORD0_FILES_TOTAL,
 128         FATTR4_WORD1_SPACE_AVAIL
 129         | FATTR4_WORD1_SPACE_FREE
 130         | FATTR4_WORD1_SPACE_TOTAL
 131 };
 132
 133 const u32 nfs4_pathconf_bitmap[2] = {
 134         FATTR4_WORD0_MAXLINK
 135         | FATTR4_WORD0_MAXNAME,
 136         0
 137 };
 138
 139 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 140                         | FATTR4_WORD0_MAXREAD
 141                         | FATTR4_WORD0_MAXWRITE
 142                         | FATTR4_WORD0_LEASE_TIME,
 143                         FATTR4_WORD1_TIME_DELTA
 144                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 145 };
 146
 147 const u32 nfs4_fs_locations_bitmap[2] = {
 148         FATTR4_WORD0_TYPE
 149         | FATTR4_WORD0_CHANGE
 150         | FATTR4_WORD0_SIZE
 151         | FATTR4_WORD0_FSID
 152         | FATTR4_WORD0_FILEID
 153         | FATTR4_WORD0_FS_LOCATIONS,
 154         FATTR4_WORD1_MODE
 155         | FATTR4_WORD1_NUMLINKS
 156         | FATTR4_WORD1_OWNER
 157         | FATTR4_WORD1_OWNER_GROUP
 158         | FATTR4_WORD1_RAWDEV
 159         | FATTR4_WORD1_SPACE_USED
 160         | FATTR4_WORD1_TIME_ACCESS
 161         | FATTR4_WORD1_TIME_METADATA
 162         | FATTR4_WORD1_TIME_MODIFY
 163         | FATTR4_WORD1_MOUNTED_ON_FILEID
 164 };
 165
 166 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 167                 struct nfs4_readdir_arg *readdir)
 168 {
 169         __be32 *start, *p;
 170
 171         BUG_ON(readdir->count < 80);
 172         if (cookie > 2) {
 173                 readdir->cookie = cookie;
 174                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 175                 return;
 176         }
 177
 178         readdir->cookie = 0;
 179         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 180         if (cookie == 2)
 181                 return;
 182
 183         /*
 184          * NFSv4 servers do not return entries for '.' and '..'
 185          * Therefore, we fake these entries here.  We let '.'
 186          * have cookie 0 and '..' have cookie 1.  Note that
 187          * when talking to the server, we always send cookie 0
 188          * instead of 1 or 2.
 189          */
 190         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 191
 192         if (cookie == 0) {
 193                 *p++ = xdr_one;                                  /* next */
 194                 *p++ = xdr_zero;                   /* cookie, first word */
 195                 *p++ = xdr_one;                   /* cookie, second word */
 196                 *p++ = xdr_one;                             /* entry len */
 197                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 198                 p++;
 199                 *p++ = xdr_one;                         /* bitmap length */
 200                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 201                 *p++ = htonl(8);              /* attribute buffer length */
 202                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 203         }
 204
 205         *p++ = xdr_one;                                  /* next */
 206         *p++ = xdr_zero;                   /* cookie, first word */
 207         *p++ = xdr_two;                   /* cookie, second word */
 208         *p++ = xdr_two;                             /* entry len */
 209         memcpy(p, "..\0\0", 4);                         /* entry */
 210         p++;
 211         *p++ = xdr_one;                         /* bitmap length */
 212         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 213         *p++ = htonl(8);              /* attribute buffer length */
 214         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 215
 216         readdir->pgbase = (char *)p - (char *)start;
 217         readdir->count -= readdir->pgbase;
 218         kunmap_atomic(start, KM_USER0);
 219 }
 220
 221 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 222 {
 223         int res;
 224
 225         might_sleep();
 226
 227         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 228                         nfs_wait_bit_killable, TASK_KILLABLE);
 229         return res;
 230 }
 231
 232 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 233 {
 234         int res = 0;
 235
 236         might_sleep();
 237
 238         if (*timeout <= 0)
 239                 *timeout = NFS4_POLL_RETRY_MIN;
 240         if (*timeout > NFS4_POLL_RETRY_MAX)
 241                 *timeout = NFS4_POLL_RETRY_MAX;
 242         schedule_timeout_killable(*timeout);
 243         if (fatal_signal_pending(current))
 244                 res = -ERESTARTSYS;
 245         *timeout <<= 1;
 246         return res;
 247 }
 248
 249 /* This is the error handling routine for processes that are allowed
 250  * to sleep.
 251  */
 252 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 253 {
 254         struct nfs_client *clp = server->nfs_client;
 255         struct nfs4_state *state = exception->state;
 256         int ret = errorcode;
 257
 258         exception->retry = 0;
 259         switch(errorcode) {
 260                 case 0:
 261                         return 0;
 262                 case -NFS4ERR_ADMIN_REVOKED:
 263                 case -NFS4ERR_BAD_STATEID:
 264                 case -NFS4ERR_OPENMODE:
 265                         if (state == NULL)
 266                                 break;
 267                         nfs4_schedule_stateid_recovery(server, state);
 268                         goto wait_on_recovery;
 269                 case -NFS4ERR_STALE_STATEID:
 270                 case -NFS4ERR_STALE_CLIENTID:
 271                 case -NFS4ERR_EXPIRED:
 272                         nfs4_schedule_lease_recovery(clp);
 273                         goto wait_on_recovery;
 274 #if defined(CONFIG_NFS_V4_1)
 275                 case -NFS4ERR_BADSESSION:
 276                 case -NFS4ERR_BADSLOT:
 277                 case -NFS4ERR_BAD_HIGH_SLOT:
 278                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 279                 case -NFS4ERR_DEADSESSION:
 280                 case -NFS4ERR_SEQ_FALSE_RETRY:
 281                 case -NFS4ERR_SEQ_MISORDERED:
 282                         dprintk("%s ERROR: %d Reset session\n", __func__,
 283                                 errorcode);
 284                         nfs4_schedule_session_recovery(clp->cl_session);
 285                         exception->retry = 1;
 286                         break;
 287 #endif /* defined(CONFIG_NFS_V4_1) */
 288                 case -NFS4ERR_FILE_OPEN:
 289                         if (exception->timeout > HZ) {
 290                                 /* We have retried a decent amount, time to
 291                                  * fail
 292                                  */
 293                                 ret = -EBUSY;
 294                                 break;
 295                         }
 296                 case -NFS4ERR_GRACE:
 297                 case -NFS4ERR_DELAY:
 298                 case -EKEYEXPIRED:
 299                         ret = nfs4_delay(server->client, &exception->timeout);
 300                         if (ret != 0)
 301                                 break;
 302                 case -NFS4ERR_OLD_STATEID:
 303                         exception->retry = 1;
 304                         break;
 305                 case -NFS4ERR_BADOWNER:
 306                         /* The following works around a Linux server bug! */
 307                 case -NFS4ERR_BADNAME:
 308                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 309                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 310                                 exception->retry = 1;
 311                                 printk(KERN_WARNING "NFS: v4 server %s "
 312                                                 "does not accept raw "
 313                                                 "uid/gids. "
 314                                                 "Reenabling the idmapper.\n",
 315                                                 server->nfs_client->cl_hostname);
 316                         }
 317         }
 318         /* We failed to handle the error */
 319         return nfs4_map_errors(ret);
 320 wait_on_recovery:
 321         ret = nfs4_wait_clnt_recover(clp);
 322         if (ret == 0)
 323                 exception->retry = 1;
 324         return ret;
 325 }
 326
 327
 328 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 329 {
 330         spin_lock(&clp->cl_lock);
 331         if (time_before(clp->cl_last_renewal,timestamp))
 332                 clp->cl_last_renewal = timestamp;
 333         spin_unlock(&clp->cl_lock);
 334 }
 335
 336 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 337 {
 338         do_renew_lease(server->nfs_client, timestamp);
 339 }
 340
 341 #if defined(CONFIG_NFS_V4_1)
 342
 343 /*
 344  * nfs4_free_slot - free a slot and efficiently update slot table.
 345  *
 346  * freeing a slot is trivially done by clearing its respective bit
 347  * in the bitmap.
 348  * If the freed slotid equals highest_used_slotid we want to update it
 349  * so that the server would be able to size down the slot table if needed,
 350  * otherwise we know that the highest_used_slotid is still in use.
 351  * When updating highest_used_slotid there may be "holes" in the bitmap
 352  * so we need to scan down from highest_used_slotid to 0 looking for the now
 353  * highest slotid in use.
 354  * If none found, highest_used_slotid is set to -1.
 355  *
 356  * Must be called while holding tbl->slot_tbl_lock
 357  */
 358 static void
 359 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 360 {
 361         int free_slotid = free_slot - tbl->slots;
 362         int slotid = free_slotid;
 363
 364         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 365         /* clear used bit in bitmap */
 366         __clear_bit(slotid, tbl->used_slots);
 367
 368         /* update highest_used_slotid when it is freed */
 369         if (slotid == tbl->highest_used_slotid) {
 370                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 371                 if (slotid < tbl->max_slots)
 372                         tbl->highest_used_slotid = slotid;
 373                 else
 374                         tbl->highest_used_slotid = -1;
 375         }
 376         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 377                 free_slotid, tbl->highest_used_slotid);
 378 }
 379
 380 /*
 381  * Signal state manager thread if session fore channel is drained
 382  */
 383 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 384 {
 385         struct rpc_task *task;
 386
 387         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 388                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 389                 if (task)
 390                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 391                 return;
 392         }
 393
 394         if (ses->fc_slot_table.highest_used_slotid != -1)
 395                 return;
 396
 397         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 398         complete(&ses->fc_slot_table.complete);
 399 }
 400
 401 /*
 402  * Signal state manager thread if session back channel is drained
 403  */
 404 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 405 {
 406         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 407             ses->bc_slot_table.highest_used_slotid != -1)
 408                 return;
 409         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 410         complete(&ses->bc_slot_table.complete);
 411 }
 412
 413 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 414 {
 415         struct nfs4_slot_table *tbl;
 416
 417         tbl = &res->sr_session->fc_slot_table;
 418         if (!res->sr_slot) {
 419                 /* just wake up the next guy waiting since
 420                  * we may have not consumed a slot after all */
 421                 dprintk("%s: No slot\n", __func__);
 422                 return;
 423         }
 424
 425         spin_lock(&tbl->slot_tbl_lock);
 426         nfs4_free_slot(tbl, res->sr_slot);
 427         nfs4_check_drain_fc_complete(res->sr_session);
 428         spin_unlock(&tbl->slot_tbl_lock);
 429         res->sr_slot = NULL;
 430 }
 431
 432 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 433 {
 434         unsigned long timestamp;
 435         struct nfs_client *clp;
 436
 437         /*
 438          * sr_status remains 1 if an RPC level error occurred. The server
 439          * may or may not have processed the sequence operation..
 440          * Proceed as if the server received and processed the sequence
 441          * operation.
 442          */
 443         if (res->sr_status == 1)
 444                 res->sr_status = NFS_OK;
 445
 446         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 447         if (!res->sr_slot)
 448                 goto out;
 449
 450         /* Check the SEQUENCE operation status */
 451         switch (res->sr_status) {
 452         case 0:
 453                 /* Update the slot's sequence and clientid lease timer */
 454                 ++res->sr_slot->seq_nr;
 455                 timestamp = res->sr_renewal_time;
 456                 clp = res->sr_session->clp;
 457                 do_renew_lease(clp, timestamp);
 458                 /* Check sequence flags */
 459                 if (res->sr_status_flags != 0)
 460                         nfs4_schedule_lease_recovery(clp);
 461                 break;
 462         case -NFS4ERR_DELAY:
 463                 /* The server detected a resend of the RPC call and
 464                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 465                  * of RFC5661.
 466                  */
 467                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 468                         __func__,
 469                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 470                         res->sr_slot->seq_nr);
 471                 goto out_retry;
 472         default:
 473                 /* Just update the slot sequence no. */
 474                 ++res->sr_slot->seq_nr;
 475         }
 476 out:
 477         /* The session may be reset by one of the error handlers. */
 478         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 479         nfs41_sequence_free_slot(res);
 480         return 1;
 481 out_retry:
 482         if (!rpc_restart_call(task))
 483                 goto out;
 484         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 485         return 0;
 486 }
 487
 488 static int nfs4_sequence_done(struct rpc_task *task,
 489                                struct nfs4_sequence_res *res)
 490 {
 491         if (res->sr_session == NULL)
 492                 return 1;
 493         return nfs41_sequence_done(task, res);
 494 }
 495
 496 /*
 497  * nfs4_find_slot - efficiently look for a free slot
 498  *
 499  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 500  * If found, we mark the slot as used, update the highest_used_slotid,
 501  * and respectively set up the sequence operation args.
 502  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 503  *
 504  * Note: must be called with under the slot_tbl_lock.
 505  */
 506 static u8
 507 nfs4_find_slot(struct nfs4_slot_table *tbl)
 508 {
 509         int slotid;
 510         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 511         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 512
 513         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 514                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 515                 tbl->max_slots);
 516         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 517         if (slotid >= tbl->max_slots)
 518                 goto out;
 519         __set_bit(slotid, tbl->used_slots);
 520         if (slotid > tbl->highest_used_slotid)
 521                 tbl->highest_used_slotid = slotid;
 522         ret_id = slotid;
 523 out:
 524         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 525                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 526         return ret_id;
 527 }
 528
 529 int nfs41_setup_sequence(struct nfs4_session *session,
 530                                 struct nfs4_sequence_args *args,
 531                                 struct nfs4_sequence_res *res,
 532                                 int cache_reply,
 533                                 struct rpc_task *task)
 534 {
 535         struct nfs4_slot *slot;
 536         struct nfs4_slot_table *tbl;
 537         u8 slotid;
 538
 539         dprintk("--> %s\n", __func__);
 540         /* slot already allocated? */
 541         if (res->sr_slot != NULL)
 542                 return 0;
 543
 544         tbl = &session->fc_slot_table;
 545
 546         spin_lock(&tbl->slot_tbl_lock);
 547         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 548             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 549                 /*
 550                  * The state manager will wait until the slot table is empty.
 551                  * Schedule the reset thread
 552                  */
 553                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 554                 spin_unlock(&tbl->slot_tbl_lock);
 555                 dprintk("%s Schedule Session Reset\n", __func__);
 556                 return -EAGAIN;
 557         }
 558
 559         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 560             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 561                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 562                 spin_unlock(&tbl->slot_tbl_lock);
 563                 dprintk("%s enforce FIFO order\n", __func__);
 564                 return -EAGAIN;
 565         }
 566
 567         slotid = nfs4_find_slot(tbl);
 568         if (slotid == NFS4_MAX_SLOT_TABLE) {
 569                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 570                 spin_unlock(&tbl->slot_tbl_lock);
 571                 dprintk("<-- %s: no free slots\n", __func__);
 572                 return -EAGAIN;
 573         }
 574         spin_unlock(&tbl->slot_tbl_lock);
 575
 576         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 577         slot = tbl->slots + slotid;
 578         args->sa_session = session;
 579         args->sa_slotid = slotid;
 580         args->sa_cache_this = cache_reply;
 581
 582         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 583
 584         res->sr_session = session;
 585         res->sr_slot = slot;
 586         res->sr_renewal_time = jiffies;
 587         res->sr_status_flags = 0;
 588         /*
 589          * sr_status is only set in decode_sequence, and so will remain
 590          * set to 1 if an rpc level failure occurs.
 591          */
 592         res->sr_status = 1;
 593         return 0;
 594 }
 595 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 596
 597 int nfs4_setup_sequence(const struct nfs_server *server,
 598                         struct nfs4_sequence_args *args,
 599                         struct nfs4_sequence_res *res,
 600                         int cache_reply,
 601                         struct rpc_task *task)
 602 {
 603         struct nfs4_session *session = nfs4_get_session(server);
 604         int ret = 0;
 605
 606         if (session == NULL) {
 607                 args->sa_session = NULL;
 608                 res->sr_session = NULL;
 609                 goto out;
 610         }
 611
 612         dprintk("--> %s clp %p session %p sr_slot %td\n",
 613                 __func__, session->clp, session, res->sr_slot ?
 614                         res->sr_slot - session->fc_slot_table.slots : -1);
 615
 616         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 617                                    task);
 618 out:
 619         dprintk("<-- %s status=%d\n", __func__, ret);
 620         return ret;
 621 }
 622
 623 struct nfs41_call_sync_data {
 624         const struct nfs_server *seq_server;
 625         struct nfs4_sequence_args *seq_args;
 626         struct nfs4_sequence_res *seq_res;
 627         int cache_reply;
 628 };
 629
 630 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 631 {
 632         struct nfs41_call_sync_data *data = calldata;
 633
 634         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 635
 636         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 637                                 data->seq_res, data->cache_reply, task))
 638                 return;
 639         rpc_call_start(task);
 640 }
 641
 642 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 643 {
 644         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 645         nfs41_call_sync_prepare(task, calldata);
 646 }
 647
 648 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 649 {
 650         struct nfs41_call_sync_data *data = calldata;
 651
 652         nfs41_sequence_done(task, data->seq_res);
 653 }
 654
 655 struct rpc_call_ops nfs41_call_sync_ops = {
 656         .rpc_call_prepare = nfs41_call_sync_prepare,
 657         .rpc_call_done = nfs41_call_sync_done,
 658 };
 659
 660 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 661         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 662         .rpc_call_done = nfs41_call_sync_done,
 663 };
 664
 665 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 666                                    struct nfs_server *server,
 667                                    struct rpc_message *msg,
 668                                    struct nfs4_sequence_args *args,
 669                                    struct nfs4_sequence_res *res,
 670                                    int cache_reply,
 671                                    int privileged)
 672 {
 673         int ret;
 674         struct rpc_task *task;
 675         struct nfs41_call_sync_data data = {
 676                 .seq_server = server,
 677                 .seq_args = args,
 678                 .seq_res = res,
 679                 .cache_reply = cache_reply,
 680         };
 681         struct rpc_task_setup task_setup = {
 682                 .rpc_client = clnt,
 683                 .rpc_message = msg,
 684                 .callback_ops = &nfs41_call_sync_ops,
 685                 .callback_data = &data
 686         };
 687
 688         res->sr_slot = NULL;
 689         if (privileged)
 690                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 691         task = rpc_run_task(&task_setup);
 692         if (IS_ERR(task))
 693                 ret = PTR_ERR(task);
 694         else {
 695                 ret = task->tk_status;
 696                 rpc_put_task(task);
 697         }
 698         return ret;
 699 }
 700
 701 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 702                             struct nfs_server *server,
 703                             struct rpc_message *msg,
 704                             struct nfs4_sequence_args *args,
 705                             struct nfs4_sequence_res *res,
 706                             int cache_reply)
 707 {
 708         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 709 }
 710
 711 #else
 712 static int nfs4_sequence_done(struct rpc_task *task,
 713                                struct nfs4_sequence_res *res)
 714 {
 715         return 1;
 716 }
 717 #endif /* CONFIG_NFS_V4_1 */
 718
 719 int _nfs4_call_sync(struct rpc_clnt *clnt,
 720                     struct nfs_server *server,
 721                     struct rpc_message *msg,
 722                     struct nfs4_sequence_args *args,
 723                     struct nfs4_sequence_res *res,
 724                     int cache_reply)
 725 {
 726         args->sa_session = res->sr_session = NULL;
 727         return rpc_call_sync(clnt, msg, 0);
 728 }
 729
 730 static inline
 731 int nfs4_call_sync(struct rpc_clnt *clnt,
 732                    struct nfs_server *server,
 733                    struct rpc_message *msg,
 734                    struct nfs4_sequence_args *args,
 735                    struct nfs4_sequence_res *res,
 736                    int cache_reply)
 737 {
 738         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 739                                                 args, res, cache_reply);
 740 }
 741
 742 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 743 {
 744         struct nfs_inode *nfsi = NFS_I(dir);
 745
 746         spin_lock(&dir->i_lock);
 747         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 748         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 749                 nfs_force_lookup_revalidate(dir);
 750         nfsi->change_attr = cinfo->after;
 751         spin_unlock(&dir->i_lock);
 752 }
 753
 754 struct nfs4_opendata {
 755         struct kref kref;
 756         struct nfs_openargs o_arg;
 757         struct nfs_openres o_res;
 758         struct nfs_open_confirmargs c_arg;
 759         struct nfs_open_confirmres c_res;
 760         struct nfs_fattr f_attr;
 761         struct nfs_fattr dir_attr;
 762         struct path path;
 763         struct dentry *dir;
 764         struct nfs4_state_owner *owner;
 765         struct nfs4_state *state;
 766         struct iattr attrs;
 767         unsigned long timestamp;
 768         unsigned int rpc_done : 1;
 769         int rpc_status;
 770         int cancelled;
 771 };
 772
 773
 774 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 775 {
 776         p->o_res.f_attr = &p->f_attr;
 777         p->o_res.dir_attr = &p->dir_attr;
 778         p->o_res.seqid = p->o_arg.seqid;
 779         p->c_res.seqid = p->c_arg.seqid;
 780         p->o_res.server = p->o_arg.server;
 781         nfs_fattr_init(&p->f_attr);
 782         nfs_fattr_init(&p->dir_attr);
 783 }
 784
 785 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 786                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 787                 const struct iattr *attrs,
 788                 gfp_t gfp_mask)
 789 {
 790         struct dentry *parent = dget_parent(path->dentry);
 791         struct inode *dir = parent->d_inode;
 792         struct nfs_server *server = NFS_SERVER(dir);
 793         struct nfs4_opendata *p;
 794
 795         p = kzalloc(sizeof(*p), gfp_mask);
 796         if (p == NULL)
 797                 goto err;
 798         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 799         if (p->o_arg.seqid == NULL)
 800                 goto err_free;
 801         path_get(path);
 802         p->path = *path;
 803         p->dir = parent;
 804         p->owner = sp;
 805         atomic_inc(&sp->so_count);
 806         p->o_arg.fh = NFS_FH(dir);
 807         p->o_arg.open_flags = flags;
 808         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 809         p->o_arg.clientid = server->nfs_client->cl_clientid;
 810         p->o_arg.id = sp->so_owner_id.id;
 811         p->o_arg.name = &p->path.dentry->d_name;
 812         p->o_arg.server = server;
 813         p->o_arg.bitmask = server->attr_bitmask;
 814         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 815         if (flags & O_CREAT) {
 816                 u32 *s;
 817
 818                 p->o_arg.u.attrs = &p->attrs;
 819                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 820                 s = (u32 *) p->o_arg.u.verifier.data;
 821                 s[0] = jiffies;
 822                 s[1] = current->pid;
 823         }
 824         p->c_arg.fh = &p->o_res.fh;
 825         p->c_arg.stateid = &p->o_res.stateid;
 826         p->c_arg.seqid = p->o_arg.seqid;
 827         nfs4_init_opendata_res(p);
 828         kref_init(&p->kref);
 829         return p;
 830 err_free:
 831         kfree(p);
 832 err:
 833         dput(parent);
 834         return NULL;
 835 }
 836
 837 static void nfs4_opendata_free(struct kref *kref)
 838 {
 839         struct nfs4_opendata *p = container_of(kref,
 840                         struct nfs4_opendata, kref);
 841
 842         nfs_free_seqid(p->o_arg.seqid);
 843         if (p->state != NULL)
 844                 nfs4_put_open_state(p->state);
 845         nfs4_put_state_owner(p->owner);
 846         dput(p->dir);
 847         path_put(&p->path);
 848         kfree(p);
 849 }
 850
 851 static void nfs4_opendata_put(struct nfs4_opendata *p)
 852 {
 853         if (p != NULL)
 854                 kref_put(&p->kref, nfs4_opendata_free);
 855 }
 856
 857 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 858 {
 859         int ret;
 860
 861         ret = rpc_wait_for_completion_task(task);
 862         return ret;
 863 }
 864
 865 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 866 {
 867         int ret = 0;
 868
 869         if (open_mode & O_EXCL)
 870                 goto out;
 871         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 872                 case FMODE_READ:
 873                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 874                                 && state->n_rdonly != 0;
 875                         break;
 876                 case FMODE_WRITE:
 877                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 878                                 && state->n_wronly != 0;
 879                         break;
 880                 case FMODE_READ|FMODE_WRITE:
 881                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 882                                 && state->n_rdwr != 0;
 883         }
 884 out:
 885         return ret;
 886 }
 887
 888 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 889 {
 890         if ((delegation->type & fmode) != fmode)
 891                 return 0;
 892         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 893                 return 0;
 894         nfs_mark_delegation_referenced(delegation);
 895         return 1;
 896 }
 897
 898 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 899 {
 900         switch (fmode) {
 901                 case FMODE_WRITE:
 902                         state->n_wronly++;
 903                         break;
 904                 case FMODE_READ:
 905                         state->n_rdonly++;
 906                         break;
 907                 case FMODE_READ|FMODE_WRITE:
 908                         state->n_rdwr++;
 909         }
 910         nfs4_state_set_mode_locked(state, state->state | fmode);
 911 }
 912
 913 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 914 {
 915         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 916                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 917         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 918         switch (fmode) {
 919                 case FMODE_READ:
 920                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 921                         break;
 922                 case FMODE_WRITE:
 923                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 924                         break;
 925                 case FMODE_READ|FMODE_WRITE:
 926                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 927         }
 928 }
 929
 930 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 931 {
 932         write_seqlock(&state->seqlock);
 933         nfs_set_open_stateid_locked(state, stateid, fmode);
 934         write_sequnlock(&state->seqlock);
 935 }
 936
 937 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 938 {
 939         /*
 940          * Protect the call to nfs4_state_set_mode_locked and
 941          * serialise the stateid update
 942          */
 943         write_seqlock(&state->seqlock);
 944         if (deleg_stateid != NULL) {
 945                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 946                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 947         }
 948         if (open_stateid != NULL)
 949                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 950         write_sequnlock(&state->seqlock);
 951         spin_lock(&state->owner->so_lock);
 952         update_open_stateflags(state, fmode);
 953         spin_unlock(&state->owner->so_lock);
 954 }
 955
 956 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 957 {
 958         struct nfs_inode *nfsi = NFS_I(state->inode);
 959         struct nfs_delegation *deleg_cur;
 960         int ret = 0;
 961
 962         fmode &= (FMODE_READ|FMODE_WRITE);
 963
 964         rcu_read_lock();
 965         deleg_cur = rcu_dereference(nfsi->delegation);
 966         if (deleg_cur == NULL)
 967                 goto no_delegation;
 968
 969         spin_lock(&deleg_cur->lock);
 970         if (nfsi->delegation != deleg_cur ||
 971             (deleg_cur->type & fmode) != fmode)
 972                 goto no_delegation_unlock;
 973
 974         if (delegation == NULL)
 975                 delegation = &deleg_cur->stateid;
 976         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 977                 goto no_delegation_unlock;
 978
 979         nfs_mark_delegation_referenced(deleg_cur);
 980         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 981         ret = 1;
 982 no_delegation_unlock:
 983         spin_unlock(&deleg_cur->lock);
 984 no_delegation:
 985         rcu_read_unlock();
 986
 987         if (!ret && open_stateid != NULL) {
 988                 __update_open_stateid(state, open_stateid, NULL, fmode);
 989                 ret = 1;
 990         }
 991
 992         return ret;
 993 }
 994
 995
 996 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 997 {
 998         struct nfs_delegation *delegation;
 999
1000         rcu_read_lock();
1001         delegation = rcu_dereference(NFS_I(inode)->delegation);
1002         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1003                 rcu_read_unlock();
1004                 return;
1005         }
1006         rcu_read_unlock();
1007         nfs_inode_return_delegation(inode);
1008 }
1009
1010 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1011 {
1012         struct nfs4_state *state = opendata->state;
1013         struct nfs_inode *nfsi = NFS_I(state->inode);
1014         struct nfs_delegation *delegation;
1015         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1016         fmode_t fmode = opendata->o_arg.fmode;
1017         nfs4_stateid stateid;
1018         int ret = -EAGAIN;
1019
1020         for (;;) {
1021                 if (can_open_cached(state, fmode, open_mode)) {
1022                         spin_lock(&state->owner->so_lock);
1023                         if (can_open_cached(state, fmode, open_mode)) {
1024                                 update_open_stateflags(state, fmode);
1025                                 spin_unlock(&state->owner->so_lock);
1026                                 goto out_return_state;
1027                         }
1028                         spin_unlock(&state->owner->so_lock);
1029                 }
1030                 rcu_read_lock();
1031                 delegation = rcu_dereference(nfsi->delegation);
1032                 if (delegation == NULL ||
1033                     !can_open_delegated(delegation, fmode)) {
1034                         rcu_read_unlock();
1035                         break;
1036                 }
1037                 /* Save the delegation */
1038                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1039                 rcu_read_unlock();
1040                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1041                 if (ret != 0)
1042                         goto out;
1043                 ret = -EAGAIN;
1044
1045                 /* Try to update the stateid using the delegation */
1046                 if (update_open_stateid(state, NULL, &stateid, fmode))
1047                         goto out_return_state;
1048         }
1049 out:
1050         return ERR_PTR(ret);
1051 out_return_state:
1052         atomic_inc(&state->count);
1053         return state;
1054 }
1055
1056 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1057 {
1058         struct inode *inode;
1059         struct nfs4_state *state = NULL;
1060         struct nfs_delegation *delegation;
1061         int ret;
1062
1063         if (!data->rpc_done) {
1064                 state = nfs4_try_open_cached(data);
1065                 goto out;
1066         }
1067
1068         ret = -EAGAIN;
1069         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1070                 goto err;
1071         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1072         ret = PTR_ERR(inode);
1073         if (IS_ERR(inode))
1074                 goto err;
1075         ret = -ENOMEM;
1076         state = nfs4_get_open_state(inode, data->owner);
1077         if (state == NULL)
1078                 goto err_put_inode;
1079         if (data->o_res.delegation_type != 0) {
1080                 int delegation_flags = 0;
1081
1082                 rcu_read_lock();
1083                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1084                 if (delegation)
1085                         delegation_flags = delegation->flags;
1086                 rcu_read_unlock();
1087                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1088                         nfs_inode_set_delegation(state->inode,
1089                                         data->owner->so_cred,
1090                                         &data->o_res);
1091                 else
1092                         nfs_inode_reclaim_delegation(state->inode,
1093                                         data->owner->so_cred,
1094                                         &data->o_res);
1095         }
1096
1097         update_open_stateid(state, &data->o_res.stateid, NULL,
1098                         data->o_arg.fmode);
1099         iput(inode);
1100 out:
1101         return state;
1102 err_put_inode:
1103         iput(inode);
1104 err:
1105         return ERR_PTR(ret);
1106 }
1107
1108 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1109 {
1110         struct nfs_inode *nfsi = NFS_I(state->inode);
1111         struct nfs_open_context *ctx;
1112
1113         spin_lock(&state->inode->i_lock);
1114         list_for_each_entry(ctx, &nfsi->open_files, list) {
1115                 if (ctx->state != state)
1116                         continue;
1117                 get_nfs_open_context(ctx);
1118                 spin_unlock(&state->inode->i_lock);
1119                 return ctx;
1120         }
1121         spin_unlock(&state->inode->i_lock);
1122         return ERR_PTR(-ENOENT);
1123 }
1124
1125 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1126 {
1127         struct nfs4_opendata *opendata;
1128
1129         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1130         if (opendata == NULL)
1131                 return ERR_PTR(-ENOMEM);
1132         opendata->state = state;
1133         atomic_inc(&state->count);
1134         return opendata;
1135 }
1136
1137 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1138 {
1139         struct nfs4_state *newstate;
1140         int ret;
1141
1142         opendata->o_arg.open_flags = 0;
1143         opendata->o_arg.fmode = fmode;
1144         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1145         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1146         nfs4_init_opendata_res(opendata);
1147         ret = _nfs4_recover_proc_open(opendata);
1148         if (ret != 0)
1149                 return ret;
1150         newstate = nfs4_opendata_to_nfs4_state(opendata);
1151         if (IS_ERR(newstate))
1152                 return PTR_ERR(newstate);
1153         nfs4_close_state(&opendata->path, newstate, fmode);
1154         *res = newstate;
1155         return 0;
1156 }
1157
1158 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1159 {
1160         struct nfs4_state *newstate;
1161         int ret;
1162
1163         /* memory barrier prior to reading state->n_* */
1164         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1165         smp_rmb();
1166         if (state->n_rdwr != 0) {
1167                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1168                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1169                 if (ret != 0)
1170                         return ret;
1171                 if (newstate != state)
1172                         return -ESTALE;
1173         }
1174         if (state->n_wronly != 0) {
1175                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1176                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1177                 if (ret != 0)
1178                         return ret;
1179                 if (newstate != state)
1180                         return -ESTALE;
1181         }
1182         if (state->n_rdonly != 0) {
1183                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1184                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1185                 if (ret != 0)
1186                         return ret;
1187                 if (newstate != state)
1188                         return -ESTALE;
1189         }
1190         /*
1191          * We may have performed cached opens for all three recoveries.
1192          * Check if we need to update the current stateid.
1193          */
1194         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1195             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1196                 write_seqlock(&state->seqlock);
1197                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1198                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1199                 write_sequnlock(&state->seqlock);
1200         }
1201         return 0;
1202 }
1203
1204 /*
1205  * OPEN_RECLAIM:
1206  *      reclaim state on the server after a reboot.
1207  */
1208 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1209 {
1210         struct nfs_delegation *delegation;
1211         struct nfs4_opendata *opendata;
1212         fmode_t delegation_type = 0;
1213         int status;
1214
1215         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1216         if (IS_ERR(opendata))
1217                 return PTR_ERR(opendata);
1218         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1219         opendata->o_arg.fh = NFS_FH(state->inode);
1220         rcu_read_lock();
1221         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1222         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1223                 delegation_type = delegation->type;
1224         rcu_read_unlock();
1225         opendata->o_arg.u.delegation_type = delegation_type;
1226         status = nfs4_open_recover(opendata, state);
1227         nfs4_opendata_put(opendata);
1228         return status;
1229 }
1230
1231 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1232 {
1233         struct nfs_server *server = NFS_SERVER(state->inode);
1234         struct nfs4_exception exception = { };
1235         int err;
1236         do {
1237                 err = _nfs4_do_open_reclaim(ctx, state);
1238                 if (err != -NFS4ERR_DELAY)
1239                         break;
1240                 nfs4_handle_exception(server, err, &exception);
1241         } while (exception.retry);
1242         return err;
1243 }
1244
1245 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1246 {
1247         struct nfs_open_context *ctx;
1248         int ret;
1249
1250         ctx = nfs4_state_find_open_context(state);
1251         if (IS_ERR(ctx))
1252                 return PTR_ERR(ctx);
1253         ret = nfs4_do_open_reclaim(ctx, state);
1254         put_nfs_open_context(ctx);
1255         return ret;
1256 }
1257
1258 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1259 {
1260         struct nfs4_opendata *opendata;
1261         int ret;
1262
1263         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1264         if (IS_ERR(opendata))
1265                 return PTR_ERR(opendata);
1266         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1267         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1268                         sizeof(opendata->o_arg.u.delegation.data));
1269         ret = nfs4_open_recover(opendata, state);
1270         nfs4_opendata_put(opendata);
1271         return ret;
1272 }
1273
1274 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1275 {
1276         struct nfs4_exception exception = { };
1277         struct nfs_server *server = NFS_SERVER(state->inode);
1278         int err;
1279         do {
1280                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1281                 switch (err) {
1282                         case 0:
1283                         case -ENOENT:
1284                         case -ESTALE:
1285                                 goto out;
1286                         case -NFS4ERR_BADSESSION:
1287                         case -NFS4ERR_BADSLOT:
1288                         case -NFS4ERR_BAD_HIGH_SLOT:
1289                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1290                         case -NFS4ERR_DEADSESSION:
1291                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1292                                 goto out;
1293                         case -NFS4ERR_STALE_CLIENTID:
1294                         case -NFS4ERR_STALE_STATEID:
1295                         case -NFS4ERR_EXPIRED:
1296                                 /* Don't recall a delegation if it was lost */
1297                                 nfs4_schedule_lease_recovery(server->nfs_client);
1298                                 goto out;
1299                         case -ERESTARTSYS:
1300                                 /*
1301                                  * The show must go on: exit, but mark the
1302                                  * stateid as needing recovery.
1303                                  */
1304                         case -NFS4ERR_ADMIN_REVOKED:
1305                         case -NFS4ERR_BAD_STATEID:
1306                                 nfs4_schedule_stateid_recovery(server, state);
1307                         case -EKEYEXPIRED:
1308                                 /*
1309                                  * User RPCSEC_GSS context has expired.
1310                                  * We cannot recover this stateid now, so
1311                                  * skip it and allow recovery thread to
1312                                  * proceed.
1313                                  */
1314                         case -ENOMEM:
1315                                 err = 0;
1316                                 goto out;
1317                 }
1318                 err = nfs4_handle_exception(server, err, &exception);
1319         } while (exception.retry);
1320 out:
1321         return err;
1322 }
1323
1324 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1325 {
1326         struct nfs4_opendata *data = calldata;
1327
1328         data->rpc_status = task->tk_status;
1329         if (data->rpc_status == 0) {
1330                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1331                                 sizeof(data->o_res.stateid.data));
1332                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1333                 renew_lease(data->o_res.server, data->timestamp);
1334                 data->rpc_done = 1;
1335         }
1336 }
1337
1338 static void nfs4_open_confirm_release(void *calldata)
1339 {
1340         struct nfs4_opendata *data = calldata;
1341         struct nfs4_state *state = NULL;
1342
1343         /* If this request hasn't been cancelled, do nothing */
1344         if (data->cancelled == 0)
1345                 goto out_free;
1346         /* In case of error, no cleanup! */
1347         if (!data->rpc_done)
1348                 goto out_free;
1349         state = nfs4_opendata_to_nfs4_state(data);
1350         if (!IS_ERR(state))
1351                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1352 out_free:
1353         nfs4_opendata_put(data);
1354 }
1355
1356 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1357         .rpc_call_done = nfs4_open_confirm_done,
1358         .rpc_release = nfs4_open_confirm_release,
1359 };
1360
1361 /*
1362  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1363  */
1364 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1365 {
1366         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1367         struct rpc_task *task;
1368         struct  rpc_message msg = {
1369                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1370                 .rpc_argp = &data->c_arg,
1371                 .rpc_resp = &data->c_res,
1372                 .rpc_cred = data->owner->so_cred,
1373         };
1374         struct rpc_task_setup task_setup_data = {
1375                 .rpc_client = server->client,
1376                 .rpc_message = &msg,
1377                 .callback_ops = &nfs4_open_confirm_ops,
1378                 .callback_data = data,
1379                 .workqueue = nfsiod_workqueue,
1380                 .flags = RPC_TASK_ASYNC,
1381         };
1382         int status;
1383
1384         kref_get(&data->kref);
1385         data->rpc_done = 0;
1386         data->rpc_status = 0;
1387         data->timestamp = jiffies;
1388         task = rpc_run_task(&task_setup_data);
1389         if (IS_ERR(task))
1390                 return PTR_ERR(task);
1391         status = nfs4_wait_for_completion_rpc_task(task);
1392         if (status != 0) {
1393                 data->cancelled = 1;
1394                 smp_wmb();
1395         } else
1396                 status = data->rpc_status;
1397         rpc_put_task(task);
1398         return status;
1399 }
1400
1401 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1402 {
1403         struct nfs4_opendata *data = calldata;
1404         struct nfs4_state_owner *sp = data->owner;
1405
1406         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1407                 return;
1408         /*
1409          * Check if we still need to send an OPEN call, or if we can use
1410          * a delegation instead.
1411          */
1412         if (data->state != NULL) {
1413                 struct nfs_delegation *delegation;
1414
1415                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1416                         goto out_no_action;
1417                 rcu_read_lock();
1418                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1419                 if (delegation != NULL &&
1420                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1421                         rcu_read_unlock();
1422                         goto out_no_action;
1423                 }
1424                 rcu_read_unlock();
1425         }
1426         /* Update sequence id. */
1427         data->o_arg.id = sp->so_owner_id.id;
1428         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1429         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1430                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1431                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1432         }
1433         data->timestamp = jiffies;
1434         if (nfs4_setup_sequence(data->o_arg.server,
1435                                 &data->o_arg.seq_args,
1436                                 &data->o_res.seq_res, 1, task))
1437                 return;
1438         rpc_call_start(task);
1439         return;
1440 out_no_action:
1441         task->tk_action = NULL;
1442
1443 }
1444
1445 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1446 {
1447         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1448         nfs4_open_prepare(task, calldata);
1449 }
1450
1451 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1452 {
1453         struct nfs4_opendata *data = calldata;
1454
1455         data->rpc_status = task->tk_status;
1456
1457         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1458                 return;
1459
1460         if (task->tk_status == 0) {
1461                 switch (data->o_res.f_attr->mode & S_IFMT) {
1462                         case S_IFREG:
1463                                 break;
1464                         case S_IFLNK:
1465                                 data->rpc_status = -ELOOP;
1466                                 break;
1467                         case S_IFDIR:
1468                                 data->rpc_status = -EISDIR;
1469                                 break;
1470                         default:
1471                                 data->rpc_status = -ENOTDIR;
1472                 }
1473                 renew_lease(data->o_res.server, data->timestamp);
1474                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1475                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1476         }
1477         data->rpc_done = 1;
1478 }
1479
1480 static void nfs4_open_release(void *calldata)
1481 {
1482         struct nfs4_opendata *data = calldata;
1483         struct nfs4_state *state = NULL;
1484
1485         /* If this request hasn't been cancelled, do nothing */
1486         if (data->cancelled == 0)
1487                 goto out_free;
1488         /* In case of error, no cleanup! */
1489         if (data->rpc_status != 0 || !data->rpc_done)
1490                 goto out_free;
1491         /* In case we need an open_confirm, no cleanup! */
1492         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1493                 goto out_free;
1494         state = nfs4_opendata_to_nfs4_state(data);
1495         if (!IS_ERR(state))
1496                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1497 out_free:
1498         nfs4_opendata_put(data);
1499 }
1500
1501 static const struct rpc_call_ops nfs4_open_ops = {
1502         .rpc_call_prepare = nfs4_open_prepare,
1503         .rpc_call_done = nfs4_open_done,
1504         .rpc_release = nfs4_open_release,
1505 };
1506
1507 static const struct rpc_call_ops nfs4_recover_open_ops = {
1508         .rpc_call_prepare = nfs4_recover_open_prepare,
1509         .rpc_call_done = nfs4_open_done,
1510         .rpc_release = nfs4_open_release,
1511 };
1512
1513 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1514 {
1515         struct inode *dir = data->dir->d_inode;
1516         struct nfs_server *server = NFS_SERVER(dir);
1517         struct nfs_openargs *o_arg = &data->o_arg;
1518         struct nfs_openres *o_res = &data->o_res;
1519         struct rpc_task *task;
1520         struct rpc_message msg = {
1521                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1522                 .rpc_argp = o_arg,
1523                 .rpc_resp = o_res,
1524                 .rpc_cred = data->owner->so_cred,
1525         };
1526         struct rpc_task_setup task_setup_data = {
1527                 .rpc_client = server->client,
1528                 .rpc_message = &msg,
1529                 .callback_ops = &nfs4_open_ops,
1530                 .callback_data = data,
1531                 .workqueue = nfsiod_workqueue,
1532                 .flags = RPC_TASK_ASYNC,
1533         };
1534         int status;
1535
1536         kref_get(&data->kref);
1537         data->rpc_done = 0;
1538         data->rpc_status = 0;
1539         data->cancelled = 0;
1540         if (isrecover)
1541                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1542         task = rpc_run_task(&task_setup_data);
1543         if (IS_ERR(task))
1544                 return PTR_ERR(task);
1545         status = nfs4_wait_for_completion_rpc_task(task);
1546         if (status != 0) {
1547                 data->cancelled = 1;
1548                 smp_wmb();
1549         } else
1550                 status = data->rpc_status;
1551         rpc_put_task(task);
1552
1553         return status;
1554 }
1555
1556 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1557 {
1558         struct inode *dir = data->dir->d_inode;
1559         struct nfs_openres *o_res = &data->o_res;
1560         int status;
1561
1562         status = nfs4_run_open_task(data, 1);
1563         if (status != 0 || !data->rpc_done)
1564                 return status;
1565
1566         nfs_refresh_inode(dir, o_res->dir_attr);
1567
1568         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1569                 status = _nfs4_proc_open_confirm(data);
1570                 if (status != 0)
1571                         return status;
1572         }
1573
1574         return status;
1575 }
1576
1577 /*
1578  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1579  */
1580 static int _nfs4_proc_open(struct nfs4_opendata *data)
1581 {
1582         struct inode *dir = data->dir->d_inode;
1583         struct nfs_server *server = NFS_SERVER(dir);
1584         struct nfs_openargs *o_arg = &data->o_arg;
1585         struct nfs_openres *o_res = &data->o_res;
1586         int status;
1587
1588         status = nfs4_run_open_task(data, 0);
1589         if (status != 0 || !data->rpc_done)
1590                 return status;
1591
1592         if (o_arg->open_flags & O_CREAT) {
1593                 update_changeattr(dir, &o_res->cinfo);
1594                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1595         } else
1596                 nfs_refresh_inode(dir, o_res->dir_attr);
1597         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1598                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1599         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1600                 status = _nfs4_proc_open_confirm(data);
1601                 if (status != 0)
1602                         return status;
1603         }
1604         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1605                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1606         return 0;
1607 }
1608
1609 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1610 {
1611         unsigned int loop;
1612         int ret;
1613
1614         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1615                 ret = nfs4_wait_clnt_recover(clp);
1616                 if (ret != 0)
1617                         break;
1618                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1619                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1620                         break;
1621                 nfs4_schedule_state_manager(clp);
1622                 ret = -EIO;
1623         }
1624         return ret;
1625 }
1626
1627 static int nfs4_recover_expired_lease(struct nfs_server *server)
1628 {
1629         return nfs4_client_recover_expired_lease(server->nfs_client);
1630 }
1631
1632 /*
1633  * OPEN_EXPIRED:
1634  *      reclaim state on the server after a network partition.
1635  *      Assumes caller holds the appropriate lock
1636  */
1637 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1638 {
1639         struct nfs4_opendata *opendata;
1640         int ret;
1641
1642         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1643         if (IS_ERR(opendata))
1644                 return PTR_ERR(opendata);
1645         ret = nfs4_open_recover(opendata, state);
1646         if (ret == -ESTALE)
1647                 d_drop(ctx->path.dentry);
1648         nfs4_opendata_put(opendata);
1649         return ret;
1650 }
1651
1652 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1653 {
1654         struct nfs_server *server = NFS_SERVER(state->inode);
1655         struct nfs4_exception exception = { };
1656         int err;
1657
1658         do {
1659                 err = _nfs4_open_expired(ctx, state);
1660                 switch (err) {
1661                 default:
1662                         goto out;
1663                 case -NFS4ERR_GRACE:
1664                 case -NFS4ERR_DELAY:
1665                         nfs4_handle_exception(server, err, &exception);
1666                         err = 0;
1667                 }
1668         } while (exception.retry);
1669 out:
1670         return err;
1671 }
1672
1673 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1674 {
1675         struct nfs_open_context *ctx;
1676         int ret;
1677
1678         ctx = nfs4_state_find_open_context(state);
1679         if (IS_ERR(ctx))
1680                 return PTR_ERR(ctx);
1681         ret = nfs4_do_open_expired(ctx, state);
1682         put_nfs_open_context(ctx);
1683         return ret;
1684 }
1685
1686 /*
1687  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1688  * fields corresponding to attributes that were used to store the verifier.
1689  * Make sure we clobber those fields in the later setattr call
1690  */
1691 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1692 {
1693         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1694             !(sattr->ia_valid & ATTR_ATIME_SET))
1695                 sattr->ia_valid |= ATTR_ATIME;
1696
1697         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1698             !(sattr->ia_valid & ATTR_MTIME_SET))
1699                 sattr->ia_valid |= ATTR_MTIME;
1700 }
1701
1702 /*
1703  * Returns a referenced nfs4_state
1704  */
1705 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)
1706 {
1707         struct nfs4_state_owner  *sp;
1708         struct nfs4_state     *state = NULL;
1709         struct nfs_server       *server = NFS_SERVER(dir);
1710         struct nfs4_opendata *opendata;
1711         int status;
1712
1713         /* Protect against reboot recovery conflicts */
1714         status = -ENOMEM;
1715         if (!(sp = nfs4_get_state_owner(server, cred))) {
1716                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1717                 goto out_err;
1718         }
1719         status = nfs4_recover_expired_lease(server);
1720         if (status != 0)
1721                 goto err_put_state_owner;
1722         if (path->dentry->d_inode != NULL)
1723                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1724         status = -ENOMEM;
1725         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1726         if (opendata == NULL)
1727                 goto err_put_state_owner;
1728
1729         if (path->dentry->d_inode != NULL)
1730                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1731
1732         status = _nfs4_proc_open(opendata);
1733         if (status != 0)
1734                 goto err_opendata_put;
1735
1736         state = nfs4_opendata_to_nfs4_state(opendata);
1737         status = PTR_ERR(state);
1738         if (IS_ERR(state))
1739                 goto err_opendata_put;
1740         if (server->caps & NFS_CAP_POSIX_LOCK)
1741                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1742
1743         if (opendata->o_arg.open_flags & O_EXCL) {
1744                 nfs4_exclusive_attrset(opendata, sattr);
1745
1746                 nfs_fattr_init(opendata->o_res.f_attr);
1747                 status = nfs4_do_setattr(state->inode, cred,
1748                                 opendata->o_res.f_attr, sattr,
1749                                 state);
1750                 if (status == 0)
1751                         nfs_setattr_update_inode(state->inode, sattr);
1752                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1753         }
1754         nfs4_opendata_put(opendata);
1755         nfs4_put_state_owner(sp);
1756         *res = state;
1757         return 0;
1758 err_opendata_put:
1759         nfs4_opendata_put(opendata);
1760 err_put_state_owner:
1761         nfs4_put_state_owner(sp);
1762 out_err:
1763         *res = NULL;
1764         return status;
1765 }
1766
1767
1768 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)
1769 {
1770         struct nfs4_exception exception = { };
1771         struct nfs4_state *res;
1772         int status;
1773
1774         do {
1775                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1776                 if (status == 0)
1777                         break;
1778                 /* NOTE: BAD_SEQID means the server and client disagree about the
1779                  * book-keeping w.r.t. state-changing operations
1780                  * (OPEN/CLOSE/LOCK/LOCKU...)
1781                  * It is actually a sign of a bug on the client or on the server.
1782                  *
1783                  * If we receive a BAD_SEQID error in the particular case of
1784                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1785                  * have unhashed the old state_owner for us, and that we can
1786                  * therefore safely retry using a new one. We should still warn
1787                  * the user though...
1788                  */
1789                 if (status == -NFS4ERR_BAD_SEQID) {
1790                         printk(KERN_WARNING "NFS: v4 server %s "
1791                                         " returned a bad sequence-id error!\n",
1792                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1793                         exception.retry = 1;
1794                         continue;
1795                 }
1796                 /*
1797                  * BAD_STATEID on OPEN means that the server cancelled our
1798                  * state before it received the OPEN_CONFIRM.
1799                  * Recover by retrying the request as per the discussion
1800                  * on Page 181 of RFC3530.
1801                  */
1802                 if (status == -NFS4ERR_BAD_STATEID) {
1803                         exception.retry = 1;
1804                         continue;
1805                 }
1806                 if (status == -EAGAIN) {
1807                         /* We must have found a delegation */
1808                         exception.retry = 1;
1809                         continue;
1810                 }
1811                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1812                                         status, &exception));
1813         } while (exception.retry);
1814         return res;
1815 }
1816
1817 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1818                             struct nfs_fattr *fattr, struct iattr *sattr,
1819                             struct nfs4_state *state)
1820 {
1821         struct nfs_server *server = NFS_SERVER(inode);
1822         struct nfs_setattrargs  arg = {
1823                 .fh             = NFS_FH(inode),
1824                 .iap            = sattr,
1825                 .server         = server,
1826                 .bitmask = server->attr_bitmask,
1827         };
1828         struct nfs_setattrres  res = {
1829                 .fattr          = fattr,
1830                 .server         = server,
1831         };
1832         struct rpc_message msg = {
1833                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1834                 .rpc_argp       = &arg,
1835                 .rpc_resp       = &res,
1836                 .rpc_cred       = cred,
1837         };
1838         unsigned long timestamp = jiffies;
1839         int status;
1840
1841         nfs_fattr_init(fattr);
1842
1843         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1844                 /* Use that stateid */
1845         } else if (state != NULL) {
1846                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1847         } else
1848                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1849
1850         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1851         if (status == 0 && state != NULL)
1852                 renew_lease(server, timestamp);
1853         return status;
1854 }
1855
1856 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1857                            struct nfs_fattr *fattr, struct iattr *sattr,
1858                            struct nfs4_state *state)
1859 {
1860         struct nfs_server *server = NFS_SERVER(inode);
1861         struct nfs4_exception exception = { };
1862         int err;
1863         do {
1864                 err = nfs4_handle_exception(server,
1865                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1866                                 &exception);
1867         } while (exception.retry);
1868         return err;
1869 }
1870
1871 struct nfs4_closedata {
1872         struct path path;
1873         struct inode *inode;
1874         struct nfs4_state *state;
1875         struct nfs_closeargs arg;
1876         struct nfs_closeres res;
1877         struct nfs_fattr fattr;
1878         unsigned long timestamp;
1879         bool roc;
1880         u32 roc_barrier;
1881 };
1882
1883 static void nfs4_free_closedata(void *data)
1884 {
1885         struct nfs4_closedata *calldata = data;
1886         struct nfs4_state_owner *sp = calldata->state->owner;
1887
1888         if (calldata->roc)
1889                 pnfs_roc_release(calldata->state->inode);
1890         nfs4_put_open_state(calldata->state);
1891         nfs_free_seqid(calldata->arg.seqid);
1892         nfs4_put_state_owner(sp);
1893         path_put(&calldata->path);
1894         kfree(calldata);
1895 }
1896
1897 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1898                 fmode_t fmode)
1899 {
1900         spin_lock(&state->owner->so_lock);
1901         if (!(fmode & FMODE_READ))
1902                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1903         if (!(fmode & FMODE_WRITE))
1904                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1905         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1906         spin_unlock(&state->owner->so_lock);
1907 }
1908
1909 static void nfs4_close_done(struct rpc_task *task, void *data)
1910 {
1911         struct nfs4_closedata *calldata = data;
1912         struct nfs4_state *state = calldata->state;
1913         struct nfs_server *server = NFS_SERVER(calldata->inode);
1914
1915         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1916                 return;
1917         /* hmm. we are done with the inode, and in the process of freeing
1918          * the state_owner. we keep this around to process errors
1919          */
1920         switch (task->tk_status) {
1921                 case 0:
1922                         if (calldata->roc)
1923                                 pnfs_roc_set_barrier(state->inode,
1924                                                      calldata->roc_barrier);
1925                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1926                         renew_lease(server, calldata->timestamp);
1927                         nfs4_close_clear_stateid_flags(state,
1928                                         calldata->arg.fmode);
1929                         break;
1930                 case -NFS4ERR_STALE_STATEID:
1931                 case -NFS4ERR_OLD_STATEID:
1932                 case -NFS4ERR_BAD_STATEID:
1933                 case -NFS4ERR_EXPIRED:
1934                         if (calldata->arg.fmode == 0)
1935                                 break;
1936                 default:
1937                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1938                                 rpc_restart_call_prepare(task);
1939         }
1940         nfs_release_seqid(calldata->arg.seqid);
1941         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1942 }
1943
1944 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1945 {
1946         struct nfs4_closedata *calldata = data;
1947         struct nfs4_state *state = calldata->state;
1948         int call_close = 0;
1949
1950         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1951                 return;
1952
1953         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1954         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1955         spin_lock(&state->owner->so_lock);
1956         /* Calculate the change in open mode */
1957         if (state->n_rdwr == 0) {
1958                 if (state->n_rdonly == 0) {
1959                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1960                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1961                         calldata->arg.fmode &= ~FMODE_READ;
1962                 }
1963                 if (state->n_wronly == 0) {
1964                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1965                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1966                         calldata->arg.fmode &= ~FMODE_WRITE;
1967                 }
1968         }
1969         spin_unlock(&state->owner->so_lock);
1970
1971         if (!call_close) {
1972                 /* Note: exit _without_ calling nfs4_close_done */
1973                 task->tk_action = NULL;
1974                 return;
1975         }
1976
1977         if (calldata->arg.fmode == 0) {
1978                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1979                 if (calldata->roc &&
1980                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1981                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1982                                      task, NULL);
1983                         return;
1984                 }
1985         }
1986
1987         nfs_fattr_init(calldata->res.fattr);
1988         calldata->timestamp = jiffies;
1989         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1990                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1991                                 1, task))
1992                 return;
1993         rpc_call_start(task);
1994 }
1995
1996 static const struct rpc_call_ops nfs4_close_ops = {
1997         .rpc_call_prepare = nfs4_close_prepare,
1998         .rpc_call_done = nfs4_close_done,
1999         .rpc_release = nfs4_free_closedata,
2000 };
2001
2002 /*
2003  * It is possible for data to be read/written from a mem-mapped file
2004  * after the sys_close call (which hits the vfs layer as a flush).
2005  * This means that we can't safely call nfsv4 close on a file until
2006  * the inode is cleared. This in turn means that we are not good
2007  * NFSv4 citizens - we do not indicate to the server to update the file's
2008  * share state even when we are done with one of the three share
2009  * stateid's in the inode.
2010  *
2011  * NOTE: Caller must be holding the sp->so_owner semaphore!
2012  */
2013 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2014 {
2015         struct nfs_server *server = NFS_SERVER(state->inode);
2016         struct nfs4_closedata *calldata;
2017         struct nfs4_state_owner *sp = state->owner;
2018         struct rpc_task *task;
2019         struct rpc_message msg = {
2020                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2021                 .rpc_cred = state->owner->so_cred,
2022         };
2023         struct rpc_task_setup task_setup_data = {
2024                 .rpc_client = server->client,
2025                 .rpc_message = &msg,
2026                 .callback_ops = &nfs4_close_ops,
2027                 .workqueue = nfsiod_workqueue,
2028                 .flags = RPC_TASK_ASYNC,
2029         };
2030         int status = -ENOMEM;
2031
2032         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2033         if (calldata == NULL)
2034                 goto out;
2035         calldata->inode = state->inode;
2036         calldata->state = state;
2037         calldata->arg.fh = NFS_FH(state->inode);
2038         calldata->arg.stateid = &state->open_stateid;
2039         /* Serialization for the sequence id */
2040         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2041         if (calldata->arg.seqid == NULL)
2042                 goto out_free_calldata;
2043         calldata->arg.fmode = 0;
2044         calldata->arg.bitmask = server->cache_consistency_bitmask;
2045         calldata->res.fattr = &calldata->fattr;
2046         calldata->res.seqid = calldata->arg.seqid;
2047         calldata->res.server = server;
2048         calldata->roc = roc;
2049         path_get(path);
2050         calldata->path = *path;
2051
2052         msg.rpc_argp = &calldata->arg;
2053         msg.rpc_resp = &calldata->res;
2054         task_setup_data.callback_data = calldata;
2055         task = rpc_run_task(&task_setup_data);
2056         if (IS_ERR(task))
2057                 return PTR_ERR(task);
2058         status = 0;
2059         if (wait)
2060                 status = rpc_wait_for_completion_task(task);
2061         rpc_put_task(task);
2062         return status;
2063 out_free_calldata:
2064         kfree(calldata);
2065 out:
2066         if (roc)
2067                 pnfs_roc_release(state->inode);
2068         nfs4_put_open_state(state);
2069         nfs4_put_state_owner(sp);
2070         return status;
2071 }
2072
2073 static struct inode *
2074 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2075 {
2076         struct nfs4_state *state;
2077
2078         /* Protect against concurrent sillydeletes */
2079         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2080         if (IS_ERR(state))
2081                 return ERR_CAST(state);
2082         ctx->state = state;
2083         return igrab(state->inode);
2084 }
2085
2086 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2087 {
2088         if (ctx->state == NULL)
2089                 return;
2090         if (is_sync)
2091                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2092         else
2093                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2094 }
2095
2096 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2097 {
2098         struct nfs4_server_caps_arg args = {
2099                 .fhandle = fhandle,
2100         };
2101         struct nfs4_server_caps_res res = {};
2102         struct rpc_message msg = {
2103                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2104                 .rpc_argp = &args,
2105                 .rpc_resp = &res,
2106         };
2107         int status;
2108
2109         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2110         if (status == 0) {
2111                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2112                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2113                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2114                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2115                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2116                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2117                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2118                         server->caps |= NFS_CAP_ACLS;
2119                 if (res.has_links != 0)
2120                         server->caps |= NFS_CAP_HARDLINKS;
2121                 if (res.has_symlinks != 0)
2122                         server->caps |= NFS_CAP_SYMLINKS;
2123                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2124                         server->caps |= NFS_CAP_FILEID;
2125                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2126                         server->caps |= NFS_CAP_MODE;
2127                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2128                         server->caps |= NFS_CAP_NLINK;
2129                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2130                         server->caps |= NFS_CAP_OWNER;
2131                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2132                         server->caps |= NFS_CAP_OWNER_GROUP;
2133                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2134                         server->caps |= NFS_CAP_ATIME;
2135                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2136                         server->caps |= NFS_CAP_CTIME;
2137                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2138                         server->caps |= NFS_CAP_MTIME;
2139
2140                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2141                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2142                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2143                 server->acl_bitmask = res.acl_bitmask;
2144         }
2145
2146         return status;
2147 }
2148
2149 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2150 {
2151         struct nfs4_exception exception = { };
2152         int err;
2153         do {
2154                 err = nfs4_handle_exception(server,
2155                                 _nfs4_server_capabilities(server, fhandle),
2156                                 &exception);
2157         } while (exception.retry);
2158         return err;
2159 }
2160
2161 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2162                 struct nfs_fsinfo *info)
2163 {
2164         struct nfs4_lookup_root_arg args = {
2165                 .bitmask = nfs4_fattr_bitmap,
2166         };
2167         struct nfs4_lookup_res res = {
2168                 .server = server,
2169                 .fattr = info->fattr,
2170                 .fh = fhandle,
2171         };
2172         struct rpc_message msg = {
2173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2174                 .rpc_argp = &args,
2175                 .rpc_resp = &res,
2176         };
2177
2178         nfs_fattr_init(info->fattr);
2179         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2180 }
2181
2182 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2183                 struct nfs_fsinfo *info)
2184 {
2185         struct nfs4_exception exception = { };
2186         int err;
2187         do {
2188                 err = nfs4_handle_exception(server,
2189                                 _nfs4_lookup_root(server, fhandle, info),
2190                                 &exception);
2191         } while (exception.retry);
2192         return err;
2193 }
2194
2195 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2196                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2197 {
2198         struct rpc_auth *auth;
2199         int ret;
2200
2201         auth = rpcauth_create(flavor, server->client);
2202         if (!auth) {
2203                 ret = -EIO;
2204                 goto out;
2205         }
2206         ret = nfs4_lookup_root(server, fhandle, info);
2207 out:
2208         return ret;
2209 }
2210
2211 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2212                               struct nfs_fsinfo *info)
2213 {
2214         int i, len, status = 0;
2215         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2216
2217         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2218         flav_array[len] = RPC_AUTH_NULL;
2219         len += 1;
2220
2221         for (i = 0; i < len; i++) {
2222                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2223                 if (status == -EPERM || status == -EACCES)
2224                         continue;
2225                 break;
2226         }
2227         return status;
2228 }
2229
2230 /*
2231  * get the file handle for the "/" directory on the server
2232  */
2233 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2234                               struct nfs_fsinfo *info)
2235 {
2236         int status = nfs4_lookup_root(server, fhandle, info);
2237         if (status == -EPERM)
2238                 status = nfs4_find_root_sec(server, fhandle, info);
2239         if (status == 0)
2240                 status = nfs4_server_capabilities(server, fhandle);
2241         if (status == 0)
2242                 status = nfs4_do_fsinfo(server, fhandle, info);
2243         return nfs4_map_errors(status);
2244 }
2245
2246 /*
2247  * Get locations and (maybe) other attributes of a referral.
2248  * Note that we'll actually follow the referral later when
2249  * we detect fsid mismatch in inode revalidation
2250  */
2251 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2252 {
2253         int status = -ENOMEM;
2254         struct page *page = NULL;
2255         struct nfs4_fs_locations *locations = NULL;
2256
2257         page = alloc_page(GFP_KERNEL);
2258         if (page == NULL)
2259                 goto out;
2260         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2261         if (locations == NULL)
2262                 goto out;
2263
2264         status = nfs4_proc_fs_locations(dir, name, locations, page);
2265         if (status != 0)
2266                 goto out;
2267         /* Make sure server returned a different fsid for the referral */
2268         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2269                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2270                 status = -EIO;
2271                 goto out;
2272         }
2273
2274         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2275         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2276         if (!fattr->mode)
2277                 fattr->mode = S_IFDIR;
2278         memset(fhandle, 0, sizeof(struct nfs_fh));
2279 out:
2280         if (page)
2281                 __free_page(page);
2282         kfree(locations);
2283         return status;
2284 }
2285
2286 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2287 {
2288         struct nfs4_getattr_arg args = {
2289                 .fh = fhandle,
2290                 .bitmask = server->attr_bitmask,
2291         };
2292         struct nfs4_getattr_res res = {
2293                 .fattr = fattr,
2294                 .server = server,
2295         };
2296         struct rpc_message msg = {
2297                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2298                 .rpc_argp = &args,
2299                 .rpc_resp = &res,
2300         };
2301
2302         nfs_fattr_init(fattr);
2303         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2304 }
2305
2306 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2307 {
2308         struct nfs4_exception exception = { };
2309         int err;
2310         do {
2311                 err = nfs4_handle_exception(server,
2312                                 _nfs4_proc_getattr(server, fhandle, fattr),
2313                                 &exception);
2314         } while (exception.retry);
2315         return err;
2316 }
2317
2318 /*
2319  * The file is not closed if it is opened due to the a request to change
2320  * the size of the file. The open call will not be needed once the
2321  * VFS layer lookup-intents are implemented.
2322  *
2323  * Close is called when the inode is destroyed.
2324  * If we haven't opened the file for O_WRONLY, we
2325  * need to in the size_change case to obtain a stateid.
2326  *
2327  * Got race?
2328  * Because OPEN is always done by name in nfsv4, it is
2329  * possible that we opened a different file by the same
2330  * name.  We can recognize this race condition, but we
2331  * can't do anything about it besides returning an error.
2332  *
2333  * This will be fixed with VFS changes (lookup-intent).
2334  */
2335 static int
2336 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2337                   struct iattr *sattr)
2338 {
2339         struct inode *inode = dentry->d_inode;
2340         struct rpc_cred *cred = NULL;
2341         struct nfs4_state *state = NULL;
2342         int status;
2343
2344         nfs_fattr_init(fattr);
2345
2346         /* Search for an existing open(O_WRITE) file */
2347         if (sattr->ia_valid & ATTR_FILE) {
2348                 struct nfs_open_context *ctx;
2349
2350                 ctx = nfs_file_open_context(sattr->ia_file);
2351                 if (ctx) {
2352                         cred = ctx->cred;
2353                         state = ctx->state;
2354                 }
2355         }
2356
2357         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2358         if (status == 0)
2359                 nfs_setattr_update_inode(inode, sattr);
2360         return status;
2361 }
2362
2363 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2364                 const struct nfs_fh *dirfh, const struct qstr *name,
2365                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2366 {
2367         int                    status;
2368         struct nfs4_lookup_arg args = {
2369                 .bitmask = server->attr_bitmask,
2370                 .dir_fh = dirfh,
2371                 .name = name,
2372         };
2373         struct nfs4_lookup_res res = {
2374                 .server = server,
2375                 .fattr = fattr,
2376                 .fh = fhandle,
2377         };
2378         struct rpc_message msg = {
2379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2380                 .rpc_argp = &args,
2381                 .rpc_resp = &res,
2382         };
2383
2384         nfs_fattr_init(fattr);
2385
2386         dprintk("NFS call  lookupfh %s\n", name->name);
2387         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2388         dprintk("NFS reply lookupfh: %d\n", status);
2389         return status;
2390 }
2391
2392 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2393                               struct qstr *name, struct nfs_fh *fhandle,
2394                               struct nfs_fattr *fattr)
2395 {
2396         struct nfs4_exception exception = { };
2397         int err;
2398         do {
2399                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2400                 /* FIXME: !!!! */
2401                 if (err == -NFS4ERR_MOVED) {
2402                         err = -EREMOTE;
2403                         break;
2404                 }
2405                 err = nfs4_handle_exception(server, err, &exception);
2406         } while (exception.retry);
2407         return err;
2408 }
2409
2410 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2411                 const struct qstr *name, struct nfs_fh *fhandle,
2412                 struct nfs_fattr *fattr)
2413 {
2414         int status;
2415
2416         dprintk("NFS call  lookup %s\n", name->name);
2417         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2418         if (status == -NFS4ERR_MOVED)
2419                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2420         dprintk("NFS reply lookup: %d\n", status);
2421         return status;
2422 }
2423
2424 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2425 {
2426         memset(fh, 0, sizeof(struct nfs_fh));
2427         fattr->fsid.major = 1;
2428         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2429                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2430         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2431         fattr->nlink = 2;
2432 }
2433
2434 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2435                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2436 {
2437         struct nfs4_exception exception = { };
2438         int err;
2439         do {
2440                 err = nfs4_handle_exception(NFS_SERVER(dir),
2441                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2442                                 &exception);
2443                 if (err == -EPERM)
2444                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2445         } while (exception.retry);
2446         return err;
2447 }
2448
2449 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2450 {
2451         struct nfs_server *server = NFS_SERVER(inode);
2452         struct nfs4_accessargs args = {
2453                 .fh = NFS_FH(inode),
2454                 .bitmask = server->attr_bitmask,
2455         };
2456         struct nfs4_accessres res = {
2457                 .server = server,
2458         };
2459         struct rpc_message msg = {
2460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2461                 .rpc_argp = &args,
2462                 .rpc_resp = &res,
2463                 .rpc_cred = entry->cred,
2464         };
2465         int mode = entry->mask;
2466         int status;
2467
2468         /*
2469          * Determine which access bits we want to ask for...
2470          */
2471         if (mode & MAY_READ)
2472                 args.access |= NFS4_ACCESS_READ;
2473         if (S_ISDIR(inode->i_mode)) {
2474                 if (mode & MAY_WRITE)
2475                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2476                 if (mode & MAY_EXEC)
2477                         args.access |= NFS4_ACCESS_LOOKUP;
2478         } else {
2479                 if (mode & MAY_WRITE)
2480                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2481                 if (mode & MAY_EXEC)
2482                         args.access |= NFS4_ACCESS_EXECUTE;
2483         }
2484
2485         res.fattr = nfs_alloc_fattr();
2486         if (res.fattr == NULL)
2487                 return -ENOMEM;
2488
2489         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2490         if (!status) {
2491                 entry->mask = 0;
2492                 if (res.access & NFS4_ACCESS_READ)
2493                         entry->mask |= MAY_READ;
2494                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2495                         entry->mask |= MAY_WRITE;
2496                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2497                         entry->mask |= MAY_EXEC;
2498                 nfs_refresh_inode(inode, res.fattr);
2499         }
2500         nfs_free_fattr(res.fattr);
2501         return status;
2502 }
2503
2504 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2505 {
2506         struct nfs4_exception exception = { };
2507         int err;
2508         do {
2509                 err = nfs4_handle_exception(NFS_SERVER(inode),
2510                                 _nfs4_proc_access(inode, entry),
2511                                 &exception);
2512         } while (exception.retry);
2513         return err;
2514 }
2515
2516 /*
2517  * TODO: For the time being, we don't try to get any attributes
2518  * along with any of the zero-copy operations READ, READDIR,
2519  * READLINK, WRITE.
2520  *
2521  * In the case of the first three, we want to put the GETATTR
2522  * after the read-type operation -- this is because it is hard
2523  * to predict the length of a GETATTR response in v4, and thus
2524  * align the READ data correctly.  This means that the GETATTR
2525  * may end up partially falling into the page cache, and we should
2526  * shift it into the 'tail' of the xdr_buf before processing.
2527  * To do this efficiently, we need to know the total length
2528  * of data received, which doesn't seem to be available outside
2529  * of the RPC layer.
2530  *
2531  * In the case of WRITE, we also want to put the GETATTR after
2532  * the operation -- in this case because we want to make sure
2533  * we get the post-operation mtime and size.  This means that
2534  * we can't use xdr_encode_pages() as written: we need a variant
2535  * of it which would leave room in the 'tail' iovec.
2536  *
2537  * Both of these changes to the XDR layer would in fact be quite
2538  * minor, but I decided to leave them for a subsequent patch.
2539  */
2540 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2541                 unsigned int pgbase, unsigned int pglen)
2542 {
2543         struct nfs4_readlink args = {
2544                 .fh       = NFS_FH(inode),
2545                 .pgbase   = pgbase,
2546                 .pglen    = pglen,
2547                 .pages    = &page,
2548         };
2549         struct nfs4_readlink_res res;
2550         struct rpc_message msg = {
2551                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2552                 .rpc_argp = &args,
2553                 .rpc_resp = &res,
2554         };
2555
2556         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2557 }
2558
2559 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2560                 unsigned int pgbase, unsigned int pglen)
2561 {
2562         struct nfs4_exception exception = { };
2563         int err;
2564         do {
2565                 err = nfs4_handle_exception(NFS_SERVER(inode),
2566                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2567                                 &exception);
2568         } while (exception.retry);
2569         return err;
2570 }
2571
2572 /*
2573  * Got race?
2574  * We will need to arrange for the VFS layer to provide an atomic open.
2575  * Until then, this create/open method is prone to inefficiency and race
2576  * conditions due to the lookup, create, and open VFS calls from sys_open()
2577  * placed on the wire.
2578  *
2579  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2580  * The file will be opened again in the subsequent VFS open call
2581  * (nfs4_proc_file_open).
2582  *
2583  * The open for read will just hang around to be used by any process that
2584  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2585  */
2586
2587 static int
2588 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2589                  int flags, struct nfs_open_context *ctx)
2590 {
2591         struct path my_path = {
2592                 .dentry = dentry,
2593         };
2594         struct path *path = &my_path;
2595         struct nfs4_state *state;
2596         struct rpc_cred *cred = NULL;
2597         fmode_t fmode = 0;
2598         int status = 0;
2599
2600         if (ctx != NULL) {
2601                 cred = ctx->cred;
2602                 path = &ctx->path;
2603                 fmode = ctx->mode;
2604         }
2605         sattr->ia_mode &= ~current_umask();
2606         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2607         d_drop(dentry);
2608         if (IS_ERR(state)) {
2609                 status = PTR_ERR(state);
2610                 goto out;
2611         }
2612         d_add(dentry, igrab(state->inode));
2613         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2614         if (ctx != NULL)
2615                 ctx->state = state;
2616         else
2617                 nfs4_close_sync(path, state, fmode);
2618 out:
2619         return status;
2620 }
2621
2622 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2623 {
2624         struct nfs_server *server = NFS_SERVER(dir);
2625         struct nfs_removeargs args = {
2626                 .fh = NFS_FH(dir),
2627                 .name.len = name->len,
2628                 .name.name = name->name,
2629                 .bitmask = server->attr_bitmask,
2630         };
2631         struct nfs_removeres res = {
2632                 .server = server,
2633         };
2634         struct rpc_message msg = {
2635                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2636                 .rpc_argp = &args,
2637                 .rpc_resp = &res,
2638         };
2639         int status = -ENOMEM;
2640
2641         res.dir_attr = nfs_alloc_fattr();
2642         if (res.dir_attr == NULL)
2643                 goto out;
2644
2645         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2646         if (status == 0) {
2647                 update_changeattr(dir, &res.cinfo);
2648                 nfs_post_op_update_inode(dir, res.dir_attr);
2649         }
2650         nfs_free_fattr(res.dir_attr);
2651 out:
2652         return status;
2653 }
2654
2655 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2656 {
2657         struct nfs4_exception exception = { };
2658         int err;
2659         do {
2660                 err = nfs4_handle_exception(NFS_SERVER(dir),
2661                                 _nfs4_proc_remove(dir, name),
2662                                 &exception);
2663         } while (exception.retry);
2664         return err;
2665 }
2666
2667 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2668 {
2669         struct nfs_server *server = NFS_SERVER(dir);
2670         struct nfs_removeargs *args = msg->rpc_argp;
2671         struct nfs_removeres *res = msg->rpc_resp;
2672
2673         args->bitmask = server->cache_consistency_bitmask;
2674         res->server = server;
2675         res->seq_res.sr_slot = NULL;
2676         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2677 }
2678
2679 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2680 {
2681         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2682
2683         if (!nfs4_sequence_done(task, &res->seq_res))
2684                 return 0;
2685         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2686                 return 0;
2687         update_changeattr(dir, &res->cinfo);
2688         nfs_post_op_update_inode(dir, res->dir_attr);
2689         return 1;
2690 }
2691
2692 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2693 {
2694         struct nfs_server *server = NFS_SERVER(dir);
2695         struct nfs_renameargs *arg = msg->rpc_argp;
2696         struct nfs_renameres *res = msg->rpc_resp;
2697
2698         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2699         arg->bitmask = server->attr_bitmask;
2700         res->server = server;
2701 }
2702
2703 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2704                                  struct inode *new_dir)
2705 {
2706         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2707
2708         if (!nfs4_sequence_done(task, &res->seq_res))
2709                 return 0;
2710         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2711                 return 0;
2712
2713         update_changeattr(old_dir, &res->old_cinfo);
2714         nfs_post_op_update_inode(old_dir, res->old_fattr);
2715         update_changeattr(new_dir, &res->new_cinfo);
2716         nfs_post_op_update_inode(new_dir, res->new_fattr);
2717         return 1;
2718 }
2719
2720 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2721                 struct inode *new_dir, struct qstr *new_name)
2722 {
2723         struct nfs_server *server = NFS_SERVER(old_dir);
2724         struct nfs_renameargs arg = {
2725                 .old_dir = NFS_FH(old_dir),
2726                 .new_dir = NFS_FH(new_dir),
2727                 .old_name = old_name,
2728                 .new_name = new_name,
2729                 .bitmask = server->attr_bitmask,
2730         };
2731         struct nfs_renameres res = {
2732                 .server = server,
2733         };
2734         struct rpc_message msg = {
2735                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2736                 .rpc_argp = &arg,
2737                 .rpc_resp = &res,
2738         };
2739         int status = -ENOMEM;
2740
2741         res.old_fattr = nfs_alloc_fattr();
2742         res.new_fattr = nfs_alloc_fattr();
2743         if (res.old_fattr == NULL || res.new_fattr == NULL)
2744                 goto out;
2745
2746         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2747         if (!status) {
2748                 update_changeattr(old_dir, &res.old_cinfo);
2749                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2750                 update_changeattr(new_dir, &res.new_cinfo);
2751                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2752         }
2753 out:
2754         nfs_free_fattr(res.new_fattr);
2755         nfs_free_fattr(res.old_fattr);
2756         return status;
2757 }
2758
2759 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2760                 struct inode *new_dir, struct qstr *new_name)
2761 {
2762         struct nfs4_exception exception = { };
2763         int err;
2764         do {
2765                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2766                                 _nfs4_proc_rename(old_dir, old_name,
2767                                         new_dir, new_name),
2768                                 &exception);
2769         } while (exception.retry);
2770         return err;
2771 }
2772
2773 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2774 {
2775         struct nfs_server *server = NFS_SERVER(inode);
2776         struct nfs4_link_arg arg = {
2777                 .fh     = NFS_FH(inode),
2778                 .dir_fh = NFS_FH(dir),
2779                 .name   = name,
2780                 .bitmask = server->attr_bitmask,
2781         };
2782         struct nfs4_link_res res = {
2783                 .server = server,
2784         };
2785         struct rpc_message msg = {
2786                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2787                 .rpc_argp = &arg,
2788                 .rpc_resp = &res,
2789         };
2790         int status = -ENOMEM;
2791
2792         res.fattr = nfs_alloc_fattr();
2793         res.dir_attr = nfs_alloc_fattr();
2794         if (res.fattr == NULL || res.dir_attr == NULL)
2795                 goto out;
2796
2797         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2798         if (!status) {
2799                 update_changeattr(dir, &res.cinfo);
2800                 nfs_post_op_update_inode(dir, res.dir_attr);
2801                 nfs_post_op_update_inode(inode, res.fattr);
2802         }
2803 out:
2804         nfs_free_fattr(res.dir_attr);
2805         nfs_free_fattr(res.fattr);
2806         return status;
2807 }
2808
2809 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2810 {
2811         struct nfs4_exception exception = { };
2812         int err;
2813         do {
2814                 err = nfs4_handle_exception(NFS_SERVER(inode),
2815                                 _nfs4_proc_link(inode, dir, name),
2816                                 &exception);
2817         } while (exception.retry);
2818         return err;
2819 }
2820
2821 struct nfs4_createdata {
2822         struct rpc_message msg;
2823         struct nfs4_create_arg arg;
2824         struct nfs4_create_res res;
2825         struct nfs_fh fh;
2826         struct nfs_fattr fattr;
2827         struct nfs_fattr dir_fattr;
2828 };
2829
2830 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2831                 struct qstr *name, struct iattr *sattr, u32 ftype)
2832 {
2833         struct nfs4_createdata *data;
2834
2835         data = kzalloc(sizeof(*data), GFP_KERNEL);
2836         if (data != NULL) {
2837                 struct nfs_server *server = NFS_SERVER(dir);
2838
2839                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2840                 data->msg.rpc_argp = &data->arg;
2841                 data->msg.rpc_resp = &data->res;
2842                 data->arg.dir_fh = NFS_FH(dir);
2843                 data->arg.server = server;
2844                 data->arg.name = name;
2845                 data->arg.attrs = sattr;
2846                 data->arg.ftype = ftype;
2847                 data->arg.bitmask = server->attr_bitmask;
2848                 data->res.server = server;
2849                 data->res.fh = &data->fh;
2850                 data->res.fattr = &data->fattr;
2851                 data->res.dir_fattr = &data->dir_fattr;
2852                 nfs_fattr_init(data->res.fattr);
2853                 nfs_fattr_init(data->res.dir_fattr);
2854         }
2855         return data;
2856 }
2857
2858 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2859 {
2860         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2861                                     &data->arg.seq_args, &data->res.seq_res, 1);
2862         if (status == 0) {
2863                 update_changeattr(dir, &data->res.dir_cinfo);
2864                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2865                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2866         }
2867         return status;
2868 }
2869
2870 static void nfs4_free_createdata(struct nfs4_createdata *data)
2871 {
2872         kfree(data);
2873 }
2874
2875 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2876                 struct page *page, unsigned int len, struct iattr *sattr)
2877 {
2878         struct nfs4_createdata *data;
2879         int status = -ENAMETOOLONG;
2880
2881         if (len > NFS4_MAXPATHLEN)
2882                 goto out;
2883
2884         status = -ENOMEM;
2885         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2886         if (data == NULL)
2887                 goto out;
2888
2889         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2890         data->arg.u.symlink.pages = &page;
2891         data->arg.u.symlink.len = len;
2892
2893         status = nfs4_do_create(dir, dentry, data);
2894
2895         nfs4_free_createdata(data);
2896 out:
2897         return status;
2898 }
2899
2900 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2901                 struct page *page, unsigned int len, struct iattr *sattr)
2902 {
2903         struct nfs4_exception exception = { };
2904         int err;
2905         do {
2906                 err = nfs4_handle_exception(NFS_SERVER(dir),
2907                                 _nfs4_proc_symlink(dir, dentry, page,
2908                                                         len, sattr),
2909                                 &exception);
2910         } while (exception.retry);
2911         return err;
2912 }
2913
2914 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2915                 struct iattr *sattr)
2916 {
2917         struct nfs4_createdata *data;
2918         int status = -ENOMEM;
2919
2920         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2921         if (data == NULL)
2922                 goto out;
2923
2924         status = nfs4_do_create(dir, dentry, data);
2925
2926         nfs4_free_createdata(data);
2927 out:
2928         return status;
2929 }
2930
2931 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2932                 struct iattr *sattr)
2933 {
2934         struct nfs4_exception exception = { };
2935         int err;
2936
2937         sattr->ia_mode &= ~current_umask();
2938         do {
2939                 err = nfs4_handle_exception(NFS_SERVER(dir),
2940                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2941                                 &exception);
2942         } while (exception.retry);
2943         return err;
2944 }
2945
2946 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2947                 u64 cookie, struct page **pages, unsigned int count, int plus)
2948 {
2949         struct inode            *dir = dentry->d_inode;
2950         struct nfs4_readdir_arg args = {
2951                 .fh = NFS_FH(dir),
2952                 .pages = pages,
2953                 .pgbase = 0,
2954                 .count = count,
2955                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2956                 .plus = plus,
2957         };
2958         struct nfs4_readdir_res res;
2959         struct rpc_message msg = {
2960                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2961                 .rpc_argp = &args,
2962                 .rpc_resp = &res,
2963                 .rpc_cred = cred,
2964         };
2965         int                     status;
2966
2967         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2968                         dentry->d_parent->d_name.name,
2969                         dentry->d_name.name,
2970                         (unsigned long long)cookie);
2971         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2972         res.pgbase = args.pgbase;
2973         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
2974         if (status >= 0) {
2975                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2976                 status += args.pgbase;
2977         }
2978
2979         nfs_invalidate_atime(dir);
2980
2981         dprintk("%s: returns %d\n", __func__, status);
2982         return status;
2983 }
2984
2985 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2986                 u64 cookie, struct page **pages, unsigned int count, int plus)
2987 {
2988         struct nfs4_exception exception = { };
2989         int err;
2990         do {
2991                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2992                                 _nfs4_proc_readdir(dentry, cred, cookie,
2993                                         pages, count, plus),
2994                                 &exception);
2995         } while (exception.retry);
2996         return err;
2997 }
2998
2999 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3000                 struct iattr *sattr, dev_t rdev)
3001 {
3002         struct nfs4_createdata *data;
3003         int mode = sattr->ia_mode;
3004         int status = -ENOMEM;
3005
3006         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3007         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3008
3009         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3010         if (data == NULL)
3011                 goto out;
3012
3013         if (S_ISFIFO(mode))
3014                 data->arg.ftype = NF4FIFO;
3015         else if (S_ISBLK(mode)) {
3016                 data->arg.ftype = NF4BLK;
3017                 data->arg.u.device.specdata1 = MAJOR(rdev);
3018                 data->arg.u.device.specdata2 = MINOR(rdev);
3019         }
3020         else if (S_ISCHR(mode)) {
3021                 data->arg.ftype = NF4CHR;
3022                 data->arg.u.device.specdata1 = MAJOR(rdev);
3023                 data->arg.u.device.specdata2 = MINOR(rdev);
3024         }
3025
3026         status = nfs4_do_create(dir, dentry, data);
3027
3028         nfs4_free_createdata(data);
3029 out:
3030         return status;
3031 }
3032
3033 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3034                 struct iattr *sattr, dev_t rdev)
3035 {
3036         struct nfs4_exception exception = { };
3037         int err;
3038
3039         sattr->ia_mode &= ~current_umask();
3040         do {
3041                 err = nfs4_handle_exception(NFS_SERVER(dir),
3042                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3043                                 &exception);
3044         } while (exception.retry);
3045         return err;
3046 }
3047
3048 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3049                  struct nfs_fsstat *fsstat)
3050 {
3051         struct nfs4_statfs_arg args = {
3052                 .fh = fhandle,
3053                 .bitmask = server->attr_bitmask,
3054         };
3055         struct nfs4_statfs_res res = {
3056                 .fsstat = fsstat,
3057         };
3058         struct rpc_message msg = {
3059                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3060                 .rpc_argp = &args,
3061                 .rpc_resp = &res,
3062         };
3063
3064         nfs_fattr_init(fsstat->fattr);
3065         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3066 }
3067
3068 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3069 {
3070         struct nfs4_exception exception = { };
3071         int err;
3072         do {
3073                 err = nfs4_handle_exception(server,
3074                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3075                                 &exception);
3076         } while (exception.retry);
3077         return err;
3078 }
3079
3080 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3081                 struct nfs_fsinfo *fsinfo)
3082 {
3083         struct nfs4_fsinfo_arg args = {
3084                 .fh = fhandle,
3085                 .bitmask = server->attr_bitmask,
3086         };
3087         struct nfs4_fsinfo_res res = {
3088                 .fsinfo = fsinfo,
3089         };
3090         struct rpc_message msg = {
3091                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3092                 .rpc_argp = &args,
3093                 .rpc_resp = &res,
3094         };
3095
3096         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3097 }
3098
3099 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3100 {
3101         struct nfs4_exception exception = { };
3102         int err;
3103
3104         do {
3105                 err = nfs4_handle_exception(server,
3106                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3107                                 &exception);
3108         } while (exception.retry);
3109         return err;
3110 }
3111
3112 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3113 {
3114         nfs_fattr_init(fsinfo->fattr);
3115         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3116 }
3117
3118 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3119                 struct nfs_pathconf *pathconf)
3120 {
3121         struct nfs4_pathconf_arg args = {
3122                 .fh = fhandle,
3123                 .bitmask = server->attr_bitmask,
3124         };
3125         struct nfs4_pathconf_res res = {
3126                 .pathconf = pathconf,
3127         };
3128         struct rpc_message msg = {
3129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3130                 .rpc_argp = &args,
3131                 .rpc_resp = &res,
3132         };
3133
3134         /* None of the pathconf attributes are mandatory to implement */
3135         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3136                 memset(pathconf, 0, sizeof(*pathconf));
3137                 return 0;
3138         }
3139
3140         nfs_fattr_init(pathconf->fattr);
3141         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3142 }
3143
3144 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3145                 struct nfs_pathconf *pathconf)
3146 {
3147         struct nfs4_exception exception = { };
3148         int err;
3149
3150         do {
3151                 err = nfs4_handle_exception(server,
3152                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3153                                 &exception);
3154         } while (exception.retry);
3155         return err;
3156 }
3157
3158 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3159 {
3160         struct nfs_server *server = NFS_SERVER(data->inode);
3161
3162         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3163                 nfs_restart_rpc(task, server->nfs_client);
3164                 return -EAGAIN;
3165         }
3166
3167         nfs_invalidate_atime(data->inode);
3168         if (task->tk_status > 0)
3169                 renew_lease(server, data->timestamp);
3170         return 0;
3171 }
3172
3173 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3174 {
3175
3176         dprintk("--> %s\n", __func__);
3177
3178         if (!nfs4_sequence_done(task, &data->res.seq_res))
3179                 return -EAGAIN;
3180
3181         return data->read_done_cb(task, data);
3182 }
3183
3184 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3185 {
3186         data->timestamp   = jiffies;
3187         data->read_done_cb = nfs4_read_done_cb;
3188         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3189 }
3190
3191 /* Reset the the nfs_read_data to send the read to the MDS. */
3192 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3193 {
3194         dprintk("%s Reset task for i/o through\n", __func__);
3195         put_lseg(data->lseg);
3196         data->lseg = NULL;
3197         /* offsets will differ in the dense stripe case */
3198         data->args.offset = data->mds_offset;
3199         data->ds_clp = NULL;
3200         data->args.fh     = NFS_FH(data->inode);
3201         data->read_done_cb = nfs4_read_done_cb;
3202         task->tk_ops = data->mds_ops;
3203         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3204 }
3205 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3206
3207 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3208 {
3209         struct inode *inode = data->inode;
3210
3211         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3212                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3213                 return -EAGAIN;
3214         }
3215         if (task->tk_status >= 0) {
3216                 renew_lease(NFS_SERVER(inode), data->timestamp);
3217                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3218         }
3219         return 0;
3220 }
3221
3222 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3223 {
3224         if (!nfs4_sequence_done(task, &data->res.seq_res))
3225                 return -EAGAIN;
3226         return data->write_done_cb(task, data);
3227 }
3228
3229 /* Reset the the nfs_write_data to send the write to the MDS. */
3230 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3231 {
3232         dprintk("%s Reset task for i/o through\n", __func__);
3233         put_lseg(data->lseg);
3234         data->lseg          = NULL;
3235         data->ds_clp        = NULL;
3236         data->write_done_cb = nfs4_write_done_cb;
3237         data->args.fh       = NFS_FH(data->inode);
3238         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3239         data->args.offset   = data->mds_offset;
3240         data->res.fattr     = &data->fattr;
3241         task->tk_ops        = data->mds_ops;
3242         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3243 }
3244 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3245
3246 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3247 {
3248         struct nfs_server *server = NFS_SERVER(data->inode);
3249
3250         if (data->lseg) {
3251                 data->args.bitmask = NULL;
3252                 data->res.fattr = NULL;
3253         } else
3254                 data->args.bitmask = server->cache_consistency_bitmask;
3255         if (!data->write_done_cb)
3256                 data->write_done_cb = nfs4_write_done_cb;
3257         data->res.server = server;
3258         data->timestamp   = jiffies;
3259
3260         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3261 }
3262
3263 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3264 {
3265         struct inode *inode = data->inode;
3266
3267         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3268                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3269                 return -EAGAIN;
3270         }
3271         nfs_refresh_inode(inode, data->res.fattr);
3272         return 0;
3273 }
3274
3275 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3276 {
3277         if (!nfs4_sequence_done(task, &data->res.seq_res))
3278                 return -EAGAIN;
3279         return data->write_done_cb(task, data);
3280 }
3281
3282 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3283 {
3284         struct nfs_server *server = NFS_SERVER(data->inode);
3285
3286         if (data->lseg) {
3287                 data->args.bitmask = NULL;
3288                 data->res.fattr = NULL;
3289         } else
3290                 data->args.bitmask = server->cache_consistency_bitmask;
3291         if (!data->write_done_cb)
3292                 data->write_done_cb = nfs4_commit_done_cb;
3293         data->res.server = server;
3294         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3295 }
3296
3297 struct nfs4_renewdata {
3298         struct nfs_client       *client;
3299         unsigned long           timestamp;
3300 };
3301
3302 /*
3303  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3304  * standalone procedure for queueing an asynchronous RENEW.
3305  */
3306 static void nfs4_renew_release(void *calldata)
3307 {
3308         struct nfs4_renewdata *data = calldata;
3309         struct nfs_client *clp = data->client;
3310
3311         if (atomic_read(&clp->cl_count) > 1)
3312                 nfs4_schedule_state_renewal(clp);
3313         nfs_put_client(clp);
3314         kfree(data);
3315 }
3316
3317 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3318 {
3319         struct nfs4_renewdata *data = calldata;
3320         struct nfs_client *clp = data->client;
3321         unsigned long timestamp = data->timestamp;
3322
3323         if (task->tk_status < 0) {
3324                 /* Unless we're shutting down, schedule state recovery! */
3325                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3326                         nfs4_schedule_lease_recovery(clp);
3327                 return;
3328         }
3329         do_renew_lease(clp, timestamp);
3330 }
3331
3332 static const struct rpc_call_ops nfs4_renew_ops = {
3333         .rpc_call_done = nfs4_renew_done,
3334         .rpc_release = nfs4_renew_release,
3335 };
3336
3337 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3338 {
3339         struct rpc_message msg = {
3340                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3341                 .rpc_argp       = clp,
3342                 .rpc_cred       = cred,
3343         };
3344         struct nfs4_renewdata *data;
3345
3346         if (!atomic_inc_not_zero(&clp->cl_count))
3347                 return -EIO;
3348         data = kmalloc(sizeof(*data), GFP_KERNEL);
3349         if (data == NULL)
3350                 return -ENOMEM;
3351         data->client = clp;
3352         data->timestamp = jiffies;
3353         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3354                         &nfs4_renew_ops, data);
3355 }
3356
3357 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3358 {
3359         struct rpc_message msg = {
3360                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3361                 .rpc_argp       = clp,
3362                 .rpc_cred       = cred,
3363         };
3364         unsigned long now = jiffies;
3365         int status;
3366
3367         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3368         if (status < 0)
3369                 return status;
3370         do_renew_lease(clp, now);
3371         return 0;
3372 }
3373
3374 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3375 {
3376         return (server->caps & NFS_CAP_ACLS)
3377                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3378                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3379 }
3380
3381 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3382  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3383  * the stack.
3384  */
3385 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3386
3387 static void buf_to_pages(const void *buf, size_t buflen,
3388                 struct page **pages, unsigned int *pgbase)
3389 {
3390         const void *p = buf;
3391
3392         *pgbase = offset_in_page(buf);
3393         p -= *pgbase;
3394         while (p < buf + buflen) {
3395                 *(pages++) = virt_to_page(p);
3396                 p += PAGE_CACHE_SIZE;
3397         }
3398 }
3399
3400 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3401                 struct page **pages, unsigned int *pgbase)
3402 {
3403         struct page *newpage, **spages;
3404         int rc = 0;
3405         size_t len;
3406         spages = pages;
3407
3408         do {
3409                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3410                 newpage = alloc_page(GFP_KERNEL);
3411
3412                 if (newpage == NULL)
3413                         goto unwind;
3414                 memcpy(page_address(newpage), buf, len);
3415                 buf += len;
3416                 buflen -= len;
3417                 *pages++ = newpage;
3418                 rc++;
3419         } while (buflen != 0);
3420
3421         return rc;
3422
3423 unwind:
3424         for(; rc > 0; rc--)
3425                 __free_page(spages[rc-1]);
3426         return -ENOMEM;
3427 }
3428
3429 struct nfs4_cached_acl {
3430         int cached;
3431         size_t len;
3432         char data[0];
3433 };
3434
3435 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3436 {
3437         struct nfs_inode *nfsi = NFS_I(inode);
3438
3439         spin_lock(&inode->i_lock);
3440         kfree(nfsi->nfs4_acl);
3441         nfsi->nfs4_acl = acl;
3442         spin_unlock(&inode->i_lock);
3443 }
3444
3445 static void nfs4_zap_acl_attr(struct inode *inode)
3446 {
3447         nfs4_set_cached_acl(inode, NULL);
3448 }
3449
3450 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3451 {
3452         struct nfs_inode *nfsi = NFS_I(inode);
3453         struct nfs4_cached_acl *acl;
3454         int ret = -ENOENT;
3455
3456         spin_lock(&inode->i_lock);
3457         acl = nfsi->nfs4_acl;
3458         if (acl == NULL)
3459                 goto out;
3460         if (buf == NULL) /* user is just asking for length */
3461                 goto out_len;
3462         if (acl->cached == 0)
3463                 goto out;
3464         ret = -ERANGE; /* see getxattr(2) man page */
3465         if (acl->len > buflen)
3466                 goto out;
3467         memcpy(buf, acl->data, acl->len);
3468 out_len:
3469         ret = acl->len;
3470 out:
3471         spin_unlock(&inode->i_lock);
3472         return ret;
3473 }
3474
3475 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3476 {
3477         struct nfs4_cached_acl *acl;
3478
3479         if (buf && acl_len <= PAGE_SIZE) {
3480                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3481                 if (acl == NULL)
3482                         goto out;
3483                 acl->cached = 1;
3484                 memcpy(acl->data, buf, acl_len);
3485         } else {
3486                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3487                 if (acl == NULL)
3488                         goto out;
3489                 acl->cached = 0;
3490         }
3491         acl->len = acl_len;
3492 out:
3493         nfs4_set_cached_acl(inode, acl);
3494 }
3495
3496 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3497 {
3498         struct page *pages[NFS4ACL_MAXPAGES];
3499         struct nfs_getaclargs args = {
3500                 .fh = NFS_FH(inode),
3501                 .acl_pages = pages,
3502                 .acl_len = buflen,
3503         };
3504         struct nfs_getaclres res = {
3505                 .acl_len = buflen,
3506         };
3507         void *resp_buf;
3508         struct rpc_message msg = {
3509                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3510                 .rpc_argp = &args,
3511                 .rpc_resp = &res,
3512         };
3513         struct page *localpage = NULL;
3514         int ret;
3515
3516         if (buflen < PAGE_SIZE) {
3517                 /* As long as we're doing a round trip to the server anyway,
3518                  * let's be prepared for a page of acl data. */
3519                 localpage = alloc_page(GFP_KERNEL);
3520                 resp_buf = page_address(localpage);
3521                 if (localpage == NULL)
3522                         return -ENOMEM;
3523                 args.acl_pages[0] = localpage;
3524                 args.acl_pgbase = 0;
3525                 args.acl_len = PAGE_SIZE;
3526         } else {
3527                 resp_buf = buf;
3528                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3529         }
3530         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3531         if (ret)
3532                 goto out_free;
3533         if (res.acl_len > args.acl_len)
3534                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3535         else
3536                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3537         if (buf) {
3538                 ret = -ERANGE;
3539                 if (res.acl_len > buflen)
3540                         goto out_free;
3541                 if (localpage)
3542                         memcpy(buf, resp_buf, res.acl_len);
3543         }
3544         ret = res.acl_len;
3545 out_free:
3546         if (localpage)
3547                 __free_page(localpage);
3548         return ret;
3549 }
3550
3551 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3552 {
3553         struct nfs4_exception exception = { };
3554         ssize_t ret;
3555         do {
3556                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3557                 if (ret >= 0)
3558                         break;
3559                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3560         } while (exception.retry);
3561         return ret;
3562 }
3563
3564 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3565 {
3566         struct nfs_server *server = NFS_SERVER(inode);
3567         int ret;
3568
3569         if (!nfs4_server_supports_acls(server))
3570                 return -EOPNOTSUPP;
3571         ret = nfs_revalidate_inode(server, inode);
3572         if (ret < 0)
3573                 return ret;
3574         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3575                 nfs_zap_acl_cache(inode);
3576         ret = nfs4_read_cached_acl(inode, buf, buflen);
3577         if (ret != -ENOENT)
3578                 return ret;
3579         return nfs4_get_acl_uncached(inode, buf, buflen);
3580 }
3581
3582 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3583 {
3584         struct nfs_server *server = NFS_SERVER(inode);
3585         struct page *pages[NFS4ACL_MAXPAGES];
3586         struct nfs_setaclargs arg = {
3587                 .fh             = NFS_FH(inode),
3588                 .acl_pages      = pages,
3589                 .acl_len        = buflen,
3590         };
3591         struct nfs_setaclres res;
3592         struct rpc_message msg = {
3593                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3594                 .rpc_argp       = &arg,
3595                 .rpc_resp       = &res,
3596         };
3597         int ret, i;
3598
3599         if (!nfs4_server_supports_acls(server))
3600                 return -EOPNOTSUPP;
3601         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3602         if (i < 0)
3603                 return i;
3604         nfs_inode_return_delegation(inode);
3605         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3606
3607         /*
3608          * Free each page after tx, so the only ref left is
3609          * held by the network stack
3610          */
3611         for (; i > 0; i--)
3612                 put_page(pages[i-1]);
3613
3614         /*
3615          * Acl update can result in inode attribute update.
3616          * so mark the attribute cache invalid.
3617          */
3618         spin_lock(&inode->i_lock);
3619         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3620         spin_unlock(&inode->i_lock);
3621         nfs_access_zap_cache(inode);
3622         nfs_zap_acl_cache(inode);
3623         return ret;
3624 }
3625
3626 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3627 {
3628         struct nfs4_exception exception = { };
3629         int err;
3630         do {
3631                 err = nfs4_handle_exception(NFS_SERVER(inode),
3632                                 __nfs4_proc_set_acl(inode, buf, buflen),
3633                                 &exception);
3634         } while (exception.retry);
3635         return err;
3636 }
3637
3638 static int
3639 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3640 {
3641         struct nfs_client *clp = server->nfs_client;
3642
3643         if (task->tk_status >= 0)
3644                 return 0;
3645         switch(task->tk_status) {
3646                 case -NFS4ERR_ADMIN_REVOKED:
3647                 case -NFS4ERR_BAD_STATEID:
3648                 case -NFS4ERR_OPENMODE:
3649                         if (state == NULL)
3650                                 break;
3651                         nfs4_schedule_stateid_recovery(server, state);
3652                         goto wait_on_recovery;
3653                 case -NFS4ERR_STALE_STATEID:
3654                 case -NFS4ERR_STALE_CLIENTID:
3655                 case -NFS4ERR_EXPIRED:
3656                         nfs4_schedule_lease_recovery(clp);
3657                         goto wait_on_recovery;
3658 #if defined(CONFIG_NFS_V4_1)
3659                 case -NFS4ERR_BADSESSION:
3660                 case -NFS4ERR_BADSLOT:
3661                 case -NFS4ERR_BAD_HIGH_SLOT:
3662                 case -NFS4ERR_DEADSESSION:
3663                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3664                 case -NFS4ERR_SEQ_FALSE_RETRY:
3665                 case -NFS4ERR_SEQ_MISORDERED:
3666                         dprintk("%s ERROR %d, Reset session\n", __func__,
3667                                 task->tk_status);
3668                         nfs4_schedule_session_recovery(clp->cl_session);
3669                         task->tk_status = 0;
3670                         return -EAGAIN;
3671 #endif /* CONFIG_NFS_V4_1 */
3672                 case -NFS4ERR_DELAY:
3673                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3674                 case -NFS4ERR_GRACE:
3675                 case -EKEYEXPIRED:
3676                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3677                         task->tk_status = 0;
3678                         return -EAGAIN;
3679                 case -NFS4ERR_OLD_STATEID:
3680                         task->tk_status = 0;
3681                         return -EAGAIN;
3682         }
3683         task->tk_status = nfs4_map_errors(task->tk_status);
3684         return 0;
3685 wait_on_recovery:
3686         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3687         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3688                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3689         task->tk_status = 0;
3690         return -EAGAIN;
3691 }
3692
3693 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3694                 unsigned short port, struct rpc_cred *cred,
3695                 struct nfs4_setclientid_res *res)
3696 {
3697         nfs4_verifier sc_verifier;
3698         struct nfs4_setclientid setclientid = {
3699                 .sc_verifier = &sc_verifier,
3700                 .sc_prog = program,
3701                 .sc_cb_ident = clp->cl_cb_ident,
3702         };
3703         struct rpc_message msg = {
3704                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3705                 .rpc_argp = &setclientid,
3706                 .rpc_resp = res,
3707                 .rpc_cred = cred,
3708         };
3709         __be32 *p;
3710         int loop = 0;
3711         int status;
3712
3713         p = (__be32*)sc_verifier.data;
3714         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3715         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3716
3717         for(;;) {
3718                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3719                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3720                                 clp->cl_ipaddr,
3721                                 rpc_peeraddr2str(clp->cl_rpcclient,
3722                                                         RPC_DISPLAY_ADDR),
3723                                 rpc_peeraddr2str(clp->cl_rpcclient,
3724                                                         RPC_DISPLAY_PROTO),
3725                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3726                                 clp->cl_id_uniquifier);
3727                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3728                                 sizeof(setclientid.sc_netid),
3729                                 rpc_peeraddr2str(clp->cl_rpcclient,
3730                                                         RPC_DISPLAY_NETID));
3731                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3732                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3733                                 clp->cl_ipaddr, port >> 8, port & 255);
3734
3735                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3736                 if (status != -NFS4ERR_CLID_INUSE)
3737                         break;
3738                 if (signalled())
3739                         break;
3740                 if (loop++ & 1)
3741                         ssleep(clp->cl_lease_time / HZ + 1);
3742                 else
3743                         if (++clp->cl_id_uniquifier == 0)
3744                                 break;
3745         }
3746         return status;
3747 }
3748
3749 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3750                 struct nfs4_setclientid_res *arg,
3751                 struct rpc_cred *cred)
3752 {
3753         struct nfs_fsinfo fsinfo;
3754         struct rpc_message msg = {
3755                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3756                 .rpc_argp = arg,
3757                 .rpc_resp = &fsinfo,
3758                 .rpc_cred = cred,
3759         };
3760         unsigned long now;
3761         int status;
3762
3763         now = jiffies;
3764         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3765         if (status == 0) {
3766                 spin_lock(&clp->cl_lock);
3767                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3768                 clp->cl_last_renewal = now;
3769                 spin_unlock(&clp->cl_lock);
3770         }
3771         return status;
3772 }
3773
3774 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3775                 struct nfs4_setclientid_res *arg,
3776                 struct rpc_cred *cred)
3777 {
3778         long timeout = 0;
3779         int err;
3780         do {
3781                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3782                 switch (err) {
3783                         case 0:
3784                                 return err;
3785                         case -NFS4ERR_RESOURCE:
3786                                 /* The IBM lawyers misread another document! */
3787                         case -NFS4ERR_DELAY:
3788                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3789                 }
3790         } while (err == 0);
3791         return err;
3792 }
3793
3794 struct nfs4_delegreturndata {
3795         struct nfs4_delegreturnargs args;
3796         struct nfs4_delegreturnres res;
3797         struct nfs_fh fh;
3798         nfs4_stateid stateid;
3799         unsigned long timestamp;
3800         struct nfs_fattr fattr;
3801         int rpc_status;
3802 };
3803
3804 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3805 {
3806         struct nfs4_delegreturndata *data = calldata;
3807
3808         if (!nfs4_sequence_done(task, &data->res.seq_res))
3809                 return;
3810
3811         switch (task->tk_status) {
3812         case -NFS4ERR_STALE_STATEID:
3813         case -NFS4ERR_EXPIRED:
3814         case 0:
3815                 renew_lease(data->res.server, data->timestamp);
3816                 break;
3817         default:
3818                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3819                                 -EAGAIN) {
3820                         nfs_restart_rpc(task, data->res.server->nfs_client);
3821                         return;
3822                 }
3823         }
3824         data->rpc_status = task->tk_status;
3825 }
3826
3827 static void nfs4_delegreturn_release(void *calldata)
3828 {
3829         kfree(calldata);
3830 }
3831
3832 #if defined(CONFIG_NFS_V4_1)
3833 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3834 {
3835         struct nfs4_delegreturndata *d_data;
3836
3837         d_data = (struct nfs4_delegreturndata *)data;
3838
3839         if (nfs4_setup_sequence(d_data->res.server,
3840                                 &d_data->args.seq_args,
3841                                 &d_data->res.seq_res, 1, task))
3842                 return;
3843         rpc_call_start(task);
3844 }
3845 #endif /* CONFIG_NFS_V4_1 */
3846
3847 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3848 #if defined(CONFIG_NFS_V4_1)
3849         .rpc_call_prepare = nfs4_delegreturn_prepare,
3850 #endif /* CONFIG_NFS_V4_1 */
3851         .rpc_call_done = nfs4_delegreturn_done,
3852         .rpc_release = nfs4_delegreturn_release,
3853 };
3854
3855 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3856 {
3857         struct nfs4_delegreturndata *data;
3858         struct nfs_server *server = NFS_SERVER(inode);
3859         struct rpc_task *task;
3860         struct rpc_message msg = {
3861                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3862                 .rpc_cred = cred,
3863         };
3864         struct rpc_task_setup task_setup_data = {
3865                 .rpc_client = server->client,
3866                 .rpc_message = &msg,
3867                 .callback_ops = &nfs4_delegreturn_ops,
3868                 .flags = RPC_TASK_ASYNC,
3869         };
3870         int status = 0;
3871
3872         data = kzalloc(sizeof(*data), GFP_NOFS);
3873         if (data == NULL)
3874                 return -ENOMEM;
3875         data->args.fhandle = &data->fh;
3876         data->args.stateid = &data->stateid;
3877         data->args.bitmask = server->attr_bitmask;
3878         nfs_copy_fh(&data->fh, NFS_FH(inode));
3879         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3880         data->res.fattr = &data->fattr;
3881         data->res.server = server;
3882         nfs_fattr_init(data->res.fattr);
3883         data->timestamp = jiffies;
3884         data->rpc_status = 0;
3885
3886         task_setup_data.callback_data = data;
3887         msg.rpc_argp = &data->args;
3888         msg.rpc_resp = &data->res;
3889         task = rpc_run_task(&task_setup_data);
3890         if (IS_ERR(task))
3891                 return PTR_ERR(task);
3892         if (!issync)
3893                 goto out;
3894         status = nfs4_wait_for_completion_rpc_task(task);
3895         if (status != 0)
3896                 goto out;
3897         status = data->rpc_status;
3898         if (status != 0)
3899                 goto out;
3900         nfs_refresh_inode(inode, &data->fattr);
3901 out:
3902         rpc_put_task(task);
3903         return status;
3904 }
3905
3906 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3907 {
3908         struct nfs_server *server = NFS_SERVER(inode);
3909         struct nfs4_exception exception = { };
3910         int err;
3911         do {
3912                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3913                 switch (err) {
3914                         case -NFS4ERR_STALE_STATEID:
3915                         case -NFS4ERR_EXPIRED:
3916                         case 0:
3917                                 return 0;
3918                 }
3919                 err = nfs4_handle_exception(server, err, &exception);
3920         } while (exception.retry);
3921         return err;
3922 }
3923
3924 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3925 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3926
3927 /*
3928  * sleep, with exponential backoff, and retry the LOCK operation.
3929  */
3930 static unsigned long
3931 nfs4_set_lock_task_retry(unsigned long timeout)
3932 {
3933         schedule_timeout_killable(timeout);
3934         timeout <<= 1;
3935         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3936                 return NFS4_LOCK_MAXTIMEOUT;
3937         return timeout;
3938 }
3939
3940 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3941 {
3942         struct inode *inode = state->inode;
3943         struct nfs_server *server = NFS_SERVER(inode);
3944         struct nfs_client *clp = server->nfs_client;
3945         struct nfs_lockt_args arg = {
3946                 .fh = NFS_FH(inode),
3947                 .fl = request,
3948         };
3949         struct nfs_lockt_res res = {
3950                 .denied = request,
3951         };
3952         struct rpc_message msg = {
3953                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3954                 .rpc_argp       = &arg,
3955                 .rpc_resp       = &res,
3956                 .rpc_cred       = state->owner->so_cred,
3957         };
3958         struct nfs4_lock_state *lsp;
3959         int status;
3960
3961         arg.lock_owner.clientid = clp->cl_clientid;
3962         status = nfs4_set_lock_state(state, request);
3963         if (status != 0)
3964                 goto out;
3965         lsp = request->fl_u.nfs4_fl.owner;
3966         arg.lock_owner.id = lsp->ls_id.id;
3967         arg.lock_owner.s_dev = server->s_dev;
3968         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3969         switch (status) {
3970                 case 0:
3971                         request->fl_type = F_UNLCK;
3972                         break;
3973                 case -NFS4ERR_DENIED:
3974                         status = 0;
3975         }
3976         request->fl_ops->fl_release_private(request);
3977 out:
3978         return status;
3979 }
3980
3981 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3982 {
3983         struct nfs4_exception exception = { };
3984         int err;
3985
3986         do {
3987                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3988                                 _nfs4_proc_getlk(state, cmd, request),
3989                                 &exception);
3990         } while (exception.retry);
3991         return err;
3992 }
3993
3994 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3995 {
3996         int res = 0;
3997         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3998                 case FL_POSIX:
3999                         res = posix_lock_file_wait(file, fl);
4000                         break;
4001                 case FL_FLOCK:
4002                         res = flock_lock_file_wait(file, fl);
4003                         break;
4004                 default:
4005                         BUG();
4006         }
4007         return res;
4008 }
4009
4010 struct nfs4_unlockdata {
4011         struct nfs_locku_args arg;
4012         struct nfs_locku_res res;
4013         struct nfs4_lock_state *lsp;
4014         struct nfs_open_context *ctx;
4015         struct file_lock fl;
4016         const struct nfs_server *server;
4017         unsigned long timestamp;
4018 };
4019
4020 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4021                 struct nfs_open_context *ctx,
4022                 struct nfs4_lock_state *lsp,
4023                 struct nfs_seqid *seqid)
4024 {
4025         struct nfs4_unlockdata *p;
4026         struct inode *inode = lsp->ls_state->inode;
4027
4028         p = kzalloc(sizeof(*p), GFP_NOFS);
4029         if (p == NULL)
4030                 return NULL;
4031         p->arg.fh = NFS_FH(inode);
4032         p->arg.fl = &p->fl;
4033         p->arg.seqid = seqid;
4034         p->res.seqid = seqid;
4035         p->arg.stateid = &lsp->ls_stateid;
4036         p->lsp = lsp;
4037         atomic_inc(&lsp->ls_count);
4038         /* Ensure we don't close file until we're done freeing locks! */
4039         p->ctx = get_nfs_open_context(ctx);
4040         memcpy(&p->fl, fl, sizeof(p->fl));
4041         p->server = NFS_SERVER(inode);
4042         return p;
4043 }
4044
4045 static void nfs4_locku_release_calldata(void *data)
4046 {
4047         struct nfs4_unlockdata *calldata = data;
4048         nfs_free_seqid(calldata->arg.seqid);
4049         nfs4_put_lock_state(calldata->lsp);
4050         put_nfs_open_context(calldata->ctx);
4051         kfree(calldata);
4052 }
4053
4054 static void nfs4_locku_done(struct rpc_task *task, void *data)
4055 {
4056         struct nfs4_unlockdata *calldata = data;
4057
4058         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4059                 return;
4060         switch (task->tk_status) {
4061                 case 0:
4062                         memcpy(calldata->lsp->ls_stateid.data,
4063                                         calldata->res.stateid.data,
4064                                         sizeof(calldata->lsp->ls_stateid.data));
4065                         renew_lease(calldata->server, calldata->timestamp);
4066                         break;
4067                 case -NFS4ERR_BAD_STATEID:
4068                 case -NFS4ERR_OLD_STATEID:
4069                 case -NFS4ERR_STALE_STATEID:
4070                 case -NFS4ERR_EXPIRED:
4071                         break;
4072                 default:
4073                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4074                                 nfs_restart_rpc(task,
4075                                                  calldata->server->nfs_client);
4076         }
4077 }
4078
4079 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4080 {
4081         struct nfs4_unlockdata *calldata = data;
4082
4083         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4084                 return;
4085         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4086                 /* Note: exit _without_ running nfs4_locku_done */
4087                 task->tk_action = NULL;
4088                 return;
4089         }
4090         calldata->timestamp = jiffies;
4091         if (nfs4_setup_sequence(calldata->server,
4092                                 &calldata->arg.seq_args,
4093                                 &calldata->res.seq_res, 1, task))
4094                 return;
4095         rpc_call_start(task);
4096 }
4097
4098 static const struct rpc_call_ops nfs4_locku_ops = {
4099         .rpc_call_prepare = nfs4_locku_prepare,
4100         .rpc_call_done = nfs4_locku_done,
4101         .rpc_release = nfs4_locku_release_calldata,
4102 };
4103
4104 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4105                 struct nfs_open_context *ctx,
4106                 struct nfs4_lock_state *lsp,
4107                 struct nfs_seqid *seqid)
4108 {
4109         struct nfs4_unlockdata *data;
4110         struct rpc_message msg = {
4111                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4112                 .rpc_cred = ctx->cred,
4113         };
4114         struct rpc_task_setup task_setup_data = {
4115                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4116                 .rpc_message = &msg,
4117                 .callback_ops = &nfs4_locku_ops,
4118                 .workqueue = nfsiod_workqueue,
4119                 .flags = RPC_TASK_ASYNC,
4120         };
4121
4122         /* Ensure this is an unlock - when canceling a lock, the
4123          * canceled lock is passed in, and it won't be an unlock.
4124          */
4125         fl->fl_type = F_UNLCK;
4126
4127         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4128         if (data == NULL) {
4129                 nfs_free_seqid(seqid);
4130                 return ERR_PTR(-ENOMEM);
4131         }
4132
4133         msg.rpc_argp = &data->arg;
4134         msg.rpc_resp = &data->res;
4135         task_setup_data.callback_data = data;
4136         return rpc_run_task(&task_setup_data);
4137 }
4138
4139 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4140 {
4141         struct nfs_inode *nfsi = NFS_I(state->inode);
4142         struct nfs_seqid *seqid;
4143         struct nfs4_lock_state *lsp;
4144         struct rpc_task *task;
4145         int status = 0;
4146         unsigned char fl_flags = request->fl_flags;
4147
4148         status = nfs4_set_lock_state(state, request);
4149         /* Unlock _before_ we do the RPC call */
4150         request->fl_flags |= FL_EXISTS;
4151         down_read(&nfsi->rwsem);
4152         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4153                 up_read(&nfsi->rwsem);
4154                 goto out;
4155         }
4156         up_read(&nfsi->rwsem);
4157         if (status != 0)
4158                 goto out;
4159         /* Is this a delegated lock? */
4160         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4161                 goto out;
4162         lsp = request->fl_u.nfs4_fl.owner;
4163         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4164         status = -ENOMEM;
4165         if (seqid == NULL)
4166                 goto out;
4167         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4168         status = PTR_ERR(task);
4169         if (IS_ERR(task))
4170                 goto out;
4171         status = nfs4_wait_for_completion_rpc_task(task);
4172         rpc_put_task(task);
4173 out:
4174         request->fl_flags = fl_flags;
4175         return status;
4176 }
4177
4178 struct nfs4_lockdata {
4179         struct nfs_lock_args arg;
4180         struct nfs_lock_res res;
4181         struct nfs4_lock_state *lsp;
4182         struct nfs_open_context *ctx;
4183         struct file_lock fl;
4184         unsigned long timestamp;
4185         int rpc_status;
4186         int cancelled;
4187         struct nfs_server *server;
4188 };
4189
4190 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4191                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4192                 gfp_t gfp_mask)
4193 {
4194         struct nfs4_lockdata *p;
4195         struct inode *inode = lsp->ls_state->inode;
4196         struct nfs_server *server = NFS_SERVER(inode);
4197
4198         p = kzalloc(sizeof(*p), gfp_mask);
4199         if (p == NULL)
4200                 return NULL;
4201
4202         p->arg.fh = NFS_FH(inode);
4203         p->arg.fl = &p->fl;
4204         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4205         if (p->arg.open_seqid == NULL)
4206                 goto out_free;
4207         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4208         if (p->arg.lock_seqid == NULL)
4209                 goto out_free_seqid;
4210         p->arg.lock_stateid = &lsp->ls_stateid;
4211         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4212         p->arg.lock_owner.id = lsp->ls_id.id;
4213         p->arg.lock_owner.s_dev = server->s_dev;
4214         p->res.lock_seqid = p->arg.lock_seqid;
4215         p->lsp = lsp;
4216         p->server = server;
4217         atomic_inc(&lsp->ls_count);
4218         p->ctx = get_nfs_open_context(ctx);
4219         memcpy(&p->fl, fl, sizeof(p->fl));
4220         return p;
4221 out_free_seqid:
4222         nfs_free_seqid(p->arg.open_seqid);
4223 out_free:
4224         kfree(p);
4225         return NULL;
4226 }
4227
4228 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4229 {
4230         struct nfs4_lockdata *data = calldata;
4231         struct nfs4_state *state = data->lsp->ls_state;
4232
4233         dprintk("%s: begin!\n", __func__);
4234         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4235                 return;
4236         /* Do we need to do an open_to_lock_owner? */
4237         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4238                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4239                         return;
4240                 data->arg.open_stateid = &state->stateid;
4241                 data->arg.new_lock_owner = 1;
4242                 data->res.open_seqid = data->arg.open_seqid;
4243         } else
4244                 data->arg.new_lock_owner = 0;
4245         data->timestamp = jiffies;
4246         if (nfs4_setup_sequence(data->server,
4247                                 &data->arg.seq_args,
4248                                 &data->res.seq_res, 1, task))
4249                 return;
4250         rpc_call_start(task);
4251         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4252 }
4253
4254 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4255 {
4256         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4257         nfs4_lock_prepare(task, calldata);
4258 }
4259
4260 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4261 {
4262         struct nfs4_lockdata *data = calldata;
4263
4264         dprintk("%s: begin!\n", __func__);
4265
4266         if (!nfs4_sequence_done(task, &data->res.seq_res))
4267                 return;
4268
4269         data->rpc_status = task->tk_status;
4270         if (data->arg.new_lock_owner != 0) {
4271                 if (data->rpc_status == 0)
4272                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4273                 else
4274                         goto out;
4275         }
4276         if (data->rpc_status == 0) {
4277                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4278                                         sizeof(data->lsp->ls_stateid.data));
4279                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4280                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4281         }
4282 out:
4283         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4284 }
4285
4286 static void nfs4_lock_release(void *calldata)
4287 {
4288         struct nfs4_lockdata *data = calldata;
4289
4290         dprintk("%s: begin!\n", __func__);
4291         nfs_free_seqid(data->arg.open_seqid);
4292         if (data->cancelled != 0) {
4293                 struct rpc_task *task;
4294                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4295                                 data->arg.lock_seqid);
4296                 if (!IS_ERR(task))
4297                         rpc_put_task_async(task);
4298                 dprintk("%s: cancelling lock!\n", __func__);
4299         } else
4300                 nfs_free_seqid(data->arg.lock_seqid);
4301         nfs4_put_lock_state(data->lsp);
4302         put_nfs_open_context(data->ctx);
4303         kfree(data);
4304         dprintk("%s: done!\n", __func__);
4305 }
4306
4307 static const struct rpc_call_ops nfs4_lock_ops = {
4308         .rpc_call_prepare = nfs4_lock_prepare,
4309         .rpc_call_done = nfs4_lock_done,
4310         .rpc_release = nfs4_lock_release,
4311 };
4312
4313 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4314         .rpc_call_prepare = nfs4_recover_lock_prepare,
4315         .rpc_call_done = nfs4_lock_done,
4316         .rpc_release = nfs4_lock_release,
4317 };
4318
4319 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4320 {
4321         switch (error) {
4322         case -NFS4ERR_ADMIN_REVOKED:
4323         case -NFS4ERR_BAD_STATEID:
4324                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4325                 if (new_lock_owner != 0 ||
4326                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4327                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4328                 break;
4329         case -NFS4ERR_STALE_STATEID:
4330                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4331         case -NFS4ERR_EXPIRED:
4332                 nfs4_schedule_lease_recovery(server->nfs_client);
4333         };
4334 }
4335
4336 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4337 {
4338         struct nfs4_lockdata *data;
4339         struct rpc_task *task;
4340         struct rpc_message msg = {
4341                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4342                 .rpc_cred = state->owner->so_cred,
4343         };
4344         struct rpc_task_setup task_setup_data = {
4345                 .rpc_client = NFS_CLIENT(state->inode),
4346                 .rpc_message = &msg,
4347                 .callback_ops = &nfs4_lock_ops,
4348                 .workqueue = nfsiod_workqueue,
4349                 .flags = RPC_TASK_ASYNC,
4350         };
4351         int ret;
4352
4353         dprintk("%s: begin!\n", __func__);
4354         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4355                         fl->fl_u.nfs4_fl.owner,
4356                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4357         if (data == NULL)
4358                 return -ENOMEM;
4359         if (IS_SETLKW(cmd))
4360                 data->arg.block = 1;
4361         if (recovery_type > NFS_LOCK_NEW) {
4362                 if (recovery_type == NFS_LOCK_RECLAIM)
4363                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4364                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4365         }
4366         msg.rpc_argp = &data->arg;
4367         msg.rpc_resp = &data->res;
4368         task_setup_data.callback_data = data;
4369         task = rpc_run_task(&task_setup_data);
4370         if (IS_ERR(task))
4371                 return PTR_ERR(task);
4372         ret = nfs4_wait_for_completion_rpc_task(task);
4373         if (ret == 0) {
4374                 ret = data->rpc_status;
4375                 if (ret)
4376                         nfs4_handle_setlk_error(data->server, data->lsp,
4377                                         data->arg.new_lock_owner, ret);
4378         } else
4379                 data->cancelled = 1;
4380         rpc_put_task(task);
4381         dprintk("%s: done, ret = %d!\n", __func__, ret);
4382         return ret;
4383 }
4384
4385 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4386 {
4387         struct nfs_server *server = NFS_SERVER(state->inode);
4388         struct nfs4_exception exception = { };
4389         int err;
4390
4391         do {
4392                 /* Cache the lock if possible... */
4393                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4394                         return 0;
4395                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4396                 if (err != -NFS4ERR_DELAY)
4397                         break;
4398                 nfs4_handle_exception(server, err, &exception);
4399         } while (exception.retry);
4400         return err;
4401 }
4402
4403 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4404 {
4405         struct nfs_server *server = NFS_SERVER(state->inode);
4406         struct nfs4_exception exception = { };
4407         int err;
4408
4409         err = nfs4_set_lock_state(state, request);
4410         if (err != 0)
4411                 return err;
4412         do {
4413                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4414                         return 0;
4415                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4416                 switch (err) {
4417                 default:
4418                         goto out;
4419                 case -NFS4ERR_GRACE:
4420                 case -NFS4ERR_DELAY:
4421                         nfs4_handle_exception(server, err, &exception);
4422                         err = 0;
4423                 }
4424         } while (exception.retry);
4425 out:
4426         return err;
4427 }
4428
4429 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4430 {
4431         struct nfs_inode *nfsi = NFS_I(state->inode);
4432         unsigned char fl_flags = request->fl_flags;
4433         int status = -ENOLCK;
4434
4435         if ((fl_flags & FL_POSIX) &&
4436                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4437                 goto out;
4438         /* Is this a delegated open? */
4439         status = nfs4_set_lock_state(state, request);
4440         if (status != 0)
4441                 goto out;
4442         request->fl_flags |= FL_ACCESS;
4443         status = do_vfs_lock(request->fl_file, request);
4444         if (status < 0)
4445                 goto out;
4446         down_read(&nfsi->rwsem);
4447         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4448                 /* Yes: cache locks! */
4449                 /* ...but avoid races with delegation recall... */
4450                 request->fl_flags = fl_flags & ~FL_SLEEP;
4451                 status = do_vfs_lock(request->fl_file, request);
4452                 goto out_unlock;
4453         }
4454         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4455         if (status != 0)
4456                 goto out_unlock;
4457         /* Note: we always want to sleep here! */
4458         request->fl_flags = fl_flags | FL_SLEEP;
4459         if (do_vfs_lock(request->fl_file, request) < 0)
4460                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4461 out_unlock:
4462         up_read(&nfsi->rwsem);
4463 out:
4464         request->fl_flags = fl_flags;
4465         return status;
4466 }
4467
4468 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4469 {
4470         struct nfs4_exception exception = { };
4471         int err;
4472
4473         do {
4474                 err = _nfs4_proc_setlk(state, cmd, request);
4475                 if (err == -NFS4ERR_DENIED)
4476                         err = -EAGAIN;
4477                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4478                                 err, &exception);
4479         } while (exception.retry);
4480         return err;
4481 }
4482
4483 static int
4484 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4485 {
4486         struct nfs_open_context *ctx;
4487         struct nfs4_state *state;
4488         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4489         int status;
4490
4491         /* verify open state */
4492         ctx = nfs_file_open_context(filp);
4493         state = ctx->state;
4494
4495         if (request->fl_start < 0 || request->fl_end < 0)
4496                 return -EINVAL;
4497
4498         if (IS_GETLK(cmd)) {
4499                 if (state != NULL)
4500                         return nfs4_proc_getlk(state, F_GETLK, request);
4501                 return 0;
4502         }
4503
4504         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4505                 return -EINVAL;
4506
4507         if (request->fl_type == F_UNLCK) {
4508                 if (state != NULL)
4509                         return nfs4_proc_unlck(state, cmd, request);
4510                 return 0;
4511         }
4512
4513         if (state == NULL)
4514                 return -ENOLCK;
4515         do {
4516                 status = nfs4_proc_setlk(state, cmd, request);
4517                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4518                         break;
4519                 timeout = nfs4_set_lock_task_retry(timeout);
4520                 status = -ERESTARTSYS;
4521                 if (signalled())
4522                         break;
4523         } while(status < 0);
4524         return status;
4525 }
4526
4527 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4528 {
4529         struct nfs_server *server = NFS_SERVER(state->inode);
4530         struct nfs4_exception exception = { };
4531         int err;
4532
4533         err = nfs4_set_lock_state(state, fl);
4534         if (err != 0)
4535                 goto out;
4536         do {
4537                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4538                 switch (err) {
4539                         default:
4540                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4541                                                 __func__, err);
4542                         case 0:
4543                         case -ESTALE:
4544                                 goto out;
4545                         case -NFS4ERR_EXPIRED:
4546                         case -NFS4ERR_STALE_CLIENTID:
4547                         case -NFS4ERR_STALE_STATEID:
4548                                 nfs4_schedule_lease_recovery(server->nfs_client);
4549                                 goto out;
4550                         case -NFS4ERR_BADSESSION:
4551                         case -NFS4ERR_BADSLOT:
4552                         case -NFS4ERR_BAD_HIGH_SLOT:
4553                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4554                         case -NFS4ERR_DEADSESSION:
4555                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4556                                 goto out;
4557                         case -ERESTARTSYS:
4558                                 /*
4559                                  * The show must go on: exit, but mark the
4560                                  * stateid as needing recovery.
4561                                  */
4562                         case -NFS4ERR_ADMIN_REVOKED:
4563                         case -NFS4ERR_BAD_STATEID:
4564                         case -NFS4ERR_OPENMODE:
4565                                 nfs4_schedule_stateid_recovery(server, state);
4566                                 err = 0;
4567                                 goto out;
4568                         case -EKEYEXPIRED:
4569                                 /*
4570                                  * User RPCSEC_GSS context has expired.
4571                                  * We cannot recover this stateid now, so
4572                                  * skip it and allow recovery thread to
4573                                  * proceed.
4574                                  */
4575                                 err = 0;
4576                                 goto out;
4577                         case -ENOMEM:
4578                         case -NFS4ERR_DENIED:
4579                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4580                                 err = 0;
4581                                 goto out;
4582                         case -NFS4ERR_DELAY:
4583                                 break;
4584                 }
4585                 err = nfs4_handle_exception(server, err, &exception);
4586         } while (exception.retry);
4587 out:
4588         return err;
4589 }
4590
4591 static void nfs4_release_lockowner_release(void *calldata)
4592 {
4593         kfree(calldata);
4594 }
4595
4596 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4597         .rpc_release = nfs4_release_lockowner_release,
4598 };
4599
4600 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4601 {
4602         struct nfs_server *server = lsp->ls_state->owner->so_server;
4603         struct nfs_release_lockowner_args *args;
4604         struct rpc_message msg = {
4605                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4606         };
4607
4608         if (server->nfs_client->cl_mvops->minor_version != 0)
4609                 return;
4610         args = kmalloc(sizeof(*args), GFP_NOFS);
4611         if (!args)
4612                 return;
4613         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4614         args->lock_owner.id = lsp->ls_id.id;
4615         args->lock_owner.s_dev = server->s_dev;
4616         msg.rpc_argp = args;
4617         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4618 }
4619
4620 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4621
4622 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4623                                    const void *buf, size_t buflen,
4624                                    int flags, int type)
4625 {
4626         if (strcmp(key, "") != 0)
4627                 return -EINVAL;
4628
4629         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4630 }
4631
4632 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4633                                    void *buf, size_t buflen, int type)
4634 {
4635         if (strcmp(key, "") != 0)
4636                 return -EINVAL;
4637
4638         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4639 }
4640
4641 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4642                                        size_t list_len, const char *name,
4643                                        size_t name_len, int type)
4644 {
4645         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4646
4647         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4648                 return 0;
4649
4650         if (list && len <= list_len)
4651                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4652         return len;
4653 }
4654
4655 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4656 {
4657         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4658                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4659                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4660                 return;
4661
4662         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4663                 NFS_ATTR_FATTR_NLINK;
4664         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4665         fattr->nlink = 2;
4666 }
4667
4668 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4669                 struct nfs4_fs_locations *fs_locations, struct page *page)
4670 {
4671         struct nfs_server *server = NFS_SERVER(dir);
4672         u32 bitmask[2] = {
4673                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4674                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4675         };
4676         struct nfs4_fs_locations_arg args = {
4677                 .dir_fh = NFS_FH(dir),
4678                 .name = name,
4679                 .page = page,
4680                 .bitmask = bitmask,
4681         };
4682         struct nfs4_fs_locations_res res = {
4683                 .fs_locations = fs_locations,
4684         };
4685         struct rpc_message msg = {
4686                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4687                 .rpc_argp = &args,
4688                 .rpc_resp = &res,
4689         };
4690         int status;
4691
4692         dprintk("%s: start\n", __func__);
4693         nfs_fattr_init(&fs_locations->fattr);
4694         fs_locations->server = server;
4695         fs_locations->nlocations = 0;
4696         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4697         nfs_fixup_referral_attributes(&fs_locations->fattr);
4698         dprintk("%s: returned status = %d\n", __func__, status);
4699         return status;
4700 }
4701
4702 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4703 {
4704         int status;
4705         struct nfs4_secinfo_arg args = {
4706                 .dir_fh = NFS_FH(dir),
4707                 .name   = name,
4708         };
4709         struct nfs4_secinfo_res res = {
4710                 .flavors     = flavors,
4711         };
4712         struct rpc_message msg = {
4713                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4714                 .rpc_argp = &args,
4715                 .rpc_resp = &res,
4716         };
4717
4718         dprintk("NFS call  secinfo %s\n", name->name);
4719         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4720         dprintk("NFS reply  secinfo: %d\n", status);
4721         return status;
4722 }
4723
4724 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4725 {
4726         struct nfs4_exception exception = { };
4727         int err;
4728         do {
4729                 err = nfs4_handle_exception(NFS_SERVER(dir),
4730                                 _nfs4_proc_secinfo(dir, name, flavors),
4731                                 &exception);
4732         } while (exception.retry);
4733         return err;
4734 }
4735
4736 #ifdef CONFIG_NFS_V4_1
4737 /*
4738  * Check the exchange flags returned by the server for invalid flags, having
4739  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4740  * DS flags set.
4741  */
4742 static int nfs4_check_cl_exchange_flags(u32 flags)
4743 {
4744         if (flags & ~EXCHGID4_FLAG_MASK_R)
4745                 goto out_inval;
4746         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4747             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4748                 goto out_inval;
4749         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4750                 goto out_inval;
4751         return NFS_OK;
4752 out_inval:
4753         return -NFS4ERR_INVAL;
4754 }
4755
4756 /*
4757  * nfs4_proc_exchange_id()
4758  *
4759  * Since the clientid has expired, all compounds using sessions
4760  * associated with the stale clientid will be returning
4761  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4762  * be in some phase of session reset.
4763  */
4764 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4765 {
4766         nfs4_verifier verifier;
4767         struct nfs41_exchange_id_args args = {
4768                 .client = clp,
4769                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4770         };
4771         struct nfs41_exchange_id_res res = {
4772                 .client = clp,
4773         };
4774         int status;
4775         struct rpc_message msg = {
4776                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4777                 .rpc_argp = &args,
4778                 .rpc_resp = &res,
4779                 .rpc_cred = cred,
4780         };
4781         __be32 *p;
4782
4783         dprintk("--> %s\n", __func__);
4784         BUG_ON(clp == NULL);
4785
4786         p = (u32 *)verifier.data;
4787         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4788         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4789         args.verifier = &verifier;
4790
4791         args.id_len = scnprintf(args.id, sizeof(args.id),
4792                                 "%s/%s.%s/%u",
4793                                 clp->cl_ipaddr,
4794                                 init_utsname()->nodename,
4795                                 init_utsname()->domainname,
4796                                 clp->cl_rpcclient->cl_auth->au_flavor);
4797
4798         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4799         if (!status)
4800                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4801         dprintk("<-- %s status= %d\n", __func__, status);
4802         return status;
4803 }
4804
4805 struct nfs4_get_lease_time_data {
4806         struct nfs4_get_lease_time_args *args;
4807         struct nfs4_get_lease_time_res *res;
4808         struct nfs_client *clp;
4809 };
4810
4811 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4812                                         void *calldata)
4813 {
4814         int ret;
4815         struct nfs4_get_lease_time_data *data =
4816                         (struct nfs4_get_lease_time_data *)calldata;
4817
4818         dprintk("--> %s\n", __func__);
4819         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4820         /* just setup sequence, do not trigger session recovery
4821            since we're invoked within one */
4822         ret = nfs41_setup_sequence(data->clp->cl_session,
4823                                    &data->args->la_seq_args,
4824                                    &data->res->lr_seq_res, 0, task);
4825
4826         BUG_ON(ret == -EAGAIN);
4827         rpc_call_start(task);
4828         dprintk("<-- %s\n", __func__);
4829 }
4830
4831 /*
4832  * Called from nfs4_state_manager thread for session setup, so don't recover
4833  * from sequence operation or clientid errors.
4834  */
4835 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4836 {
4837         struct nfs4_get_lease_time_data *data =
4838                         (struct nfs4_get_lease_time_data *)calldata;
4839
4840         dprintk("--> %s\n", __func__);
4841         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4842                 return;
4843         switch (task->tk_status) {
4844         case -NFS4ERR_DELAY:
4845         case -NFS4ERR_GRACE:
4846                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4847                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4848                 task->tk_status = 0;
4849                 nfs_restart_rpc(task, data->clp);
4850                 return;
4851         }
4852         dprintk("<-- %s\n", __func__);
4853 }
4854
4855 struct rpc_call_ops nfs4_get_lease_time_ops = {
4856         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4857         .rpc_call_done = nfs4_get_lease_time_done,
4858 };
4859
4860 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4861 {
4862         struct rpc_task *task;
4863         struct nfs4_get_lease_time_args args;
4864         struct nfs4_get_lease_time_res res = {
4865                 .lr_fsinfo = fsinfo,
4866         };
4867         struct nfs4_get_lease_time_data data = {
4868                 .args = &args,
4869                 .res = &res,
4870                 .clp = clp,
4871         };
4872         struct rpc_message msg = {
4873                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4874                 .rpc_argp = &args,
4875                 .rpc_resp = &res,
4876         };
4877         struct rpc_task_setup task_setup = {
4878                 .rpc_client = clp->cl_rpcclient,
4879                 .rpc_message = &msg,
4880                 .callback_ops = &nfs4_get_lease_time_ops,
4881                 .callback_data = &data
4882         };
4883         int status;
4884
4885         dprintk("--> %s\n", __func__);
4886         task = rpc_run_task(&task_setup);
4887
4888         if (IS_ERR(task))
4889                 status = PTR_ERR(task);
4890         else {
4891                 status = task->tk_status;
4892                 rpc_put_task(task);
4893         }
4894         dprintk("<-- %s return %d\n", __func__, status);
4895
4896         return status;
4897 }
4898
4899 /*
4900  * Reset a slot table
4901  */
4902 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4903                                  int ivalue)
4904 {
4905         struct nfs4_slot *new = NULL;
4906         int i;
4907         int ret = 0;
4908
4909         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4910                 max_reqs, tbl->max_slots);
4911
4912         /* Does the newly negotiated max_reqs match the existing slot table? */
4913         if (max_reqs != tbl->max_slots) {
4914                 ret = -ENOMEM;
4915                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4916                               GFP_NOFS);
4917                 if (!new)
4918                         goto out;
4919                 ret = 0;
4920                 kfree(tbl->slots);
4921         }
4922         spin_lock(&tbl->slot_tbl_lock);
4923         if (new) {
4924                 tbl->slots = new;
4925                 tbl->max_slots = max_reqs;
4926         }
4927         for (i = 0; i < tbl->max_slots; ++i)
4928                 tbl->slots[i].seq_nr = ivalue;
4929         spin_unlock(&tbl->slot_tbl_lock);
4930         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4931                 tbl, tbl->slots, tbl->max_slots);
4932 out:
4933         dprintk("<-- %s: return %d\n", __func__, ret);
4934         return ret;
4935 }
4936
4937 /*
4938  * Reset the forechannel and backchannel slot tables
4939  */
4940 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4941 {
4942         int status;
4943
4944         status = nfs4_reset_slot_table(&session->fc_slot_table,
4945                         session->fc_attrs.max_reqs, 1);
4946         if (status)
4947                 return status;
4948
4949         status = nfs4_reset_slot_table(&session->bc_slot_table,
4950                         session->bc_attrs.max_reqs, 0);
4951         return status;
4952 }
4953
4954 /* Destroy the slot table */
4955 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4956 {
4957         if (session->fc_slot_table.slots != NULL) {
4958                 kfree(session->fc_slot_table.slots);
4959                 session->fc_slot_table.slots = NULL;
4960         }
4961         if (session->bc_slot_table.slots != NULL) {
4962                 kfree(session->bc_slot_table.slots);
4963                 session->bc_slot_table.slots = NULL;
4964         }
4965         return;
4966 }
4967
4968 /*
4969  * Initialize slot table
4970  */
4971 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4972                 int max_slots, int ivalue)
4973 {
4974         struct nfs4_slot *slot;
4975         int ret = -ENOMEM;
4976
4977         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4978
4979         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4980
4981         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4982         if (!slot)
4983                 goto out;
4984         ret = 0;
4985
4986         spin_lock(&tbl->slot_tbl_lock);
4987         tbl->max_slots = max_slots;
4988         tbl->slots = slot;
4989         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4990         spin_unlock(&tbl->slot_tbl_lock);
4991         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4992                 tbl, tbl->slots, tbl->max_slots);
4993 out:
4994         dprintk("<-- %s: return %d\n", __func__, ret);
4995         return ret;
4996 }
4997
4998 /*
4999  * Initialize the forechannel and backchannel tables
5000  */
5001 static int nfs4_init_slot_tables(struct nfs4_session *session)
5002 {
5003         struct nfs4_slot_table *tbl;
5004         int status = 0;
5005
5006         tbl = &session->fc_slot_table;
5007         if (tbl->slots == NULL) {
5008                 status = nfs4_init_slot_table(tbl,
5009                                 session->fc_attrs.max_reqs, 1);
5010                 if (status)
5011                         return status;
5012         }
5013
5014         tbl = &session->bc_slot_table;
5015         if (tbl->slots == NULL) {
5016                 status = nfs4_init_slot_table(tbl,
5017                                 session->bc_attrs.max_reqs, 0);
5018                 if (status)
5019                         nfs4_destroy_slot_tables(session);
5020         }
5021
5022         return status;
5023 }
5024
5025 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5026 {
5027         struct nfs4_session *session;
5028         struct nfs4_slot_table *tbl;
5029
5030         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5031         if (!session)
5032                 return NULL;
5033
5034         tbl = &session->fc_slot_table;
5035         tbl->highest_used_slotid = -1;
5036         spin_lock_init(&tbl->slot_tbl_lock);
5037         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5038         init_completion(&tbl->complete);
5039
5040         tbl = &session->bc_slot_table;
5041         tbl->highest_used_slotid = -1;
5042         spin_lock_init(&tbl->slot_tbl_lock);
5043         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5044         init_completion(&tbl->complete);
5045
5046         session->session_state = 1<<NFS4_SESSION_INITING;
5047
5048         session->clp = clp;
5049         return session;
5050 }
5051
5052 void nfs4_destroy_session(struct nfs4_session *session)
5053 {
5054         nfs4_proc_destroy_session(session);
5055         dprintk("%s Destroy backchannel for xprt %p\n",
5056                 __func__, session->clp->cl_rpcclient->cl_xprt);
5057         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5058                                 NFS41_BC_MIN_CALLBACKS);
5059         nfs4_destroy_slot_tables(session);
5060         kfree(session);
5061 }
5062
5063 /*
5064  * Initialize the values to be used by the client in CREATE_SESSION
5065  * If nfs4_init_session set the fore channel request and response sizes,
5066  * use them.
5067  *
5068  * Set the back channel max_resp_sz_cached to zero to force the client to
5069  * always set csa_cachethis to FALSE because the current implementation
5070  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5071  */
5072 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5073 {
5074         struct nfs4_session *session = args->client->cl_session;
5075         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5076                      mxresp_sz = session->fc_attrs.max_resp_sz;
5077
5078         if (mxrqst_sz == 0)
5079                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5080         if (mxresp_sz == 0)
5081                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5082         /* Fore channel attributes */
5083         args->fc_attrs.headerpadsz = 0;
5084         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5085         args->fc_attrs.max_resp_sz = mxresp_sz;
5086         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5087         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5088
5089         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5090                 "max_ops=%u max_reqs=%u\n",
5091                 __func__,
5092                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5093                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5094
5095         /* Back channel attributes */
5096         args->bc_attrs.headerpadsz = 0;
5097         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5098         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5099         args->bc_attrs.max_resp_sz_cached = 0;
5100         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5101         args->bc_attrs.max_reqs = 1;
5102
5103         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5104                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5105                 __func__,
5106                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5107                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5108                 args->bc_attrs.max_reqs);
5109 }
5110
5111 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5112 {
5113         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5114         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5115
5116         if (rcvd->headerpadsz > sent->headerpadsz)
5117                 return -EINVAL;
5118         if (rcvd->max_resp_sz > sent->max_resp_sz)
5119                 return -EINVAL;
5120         /*
5121          * Our requested max_ops is the minimum we need; we're not
5122          * prepared to break up compounds into smaller pieces than that.
5123          * So, no point even trying to continue if the server won't
5124          * cooperate:
5125          */
5126         if (rcvd->max_ops < sent->max_ops)
5127                 return -EINVAL;
5128         if (rcvd->max_reqs == 0)
5129                 return -EINVAL;
5130         return 0;
5131 }
5132
5133 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5134 {
5135         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5136         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5137
5138         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5139                 return -EINVAL;
5140         if (rcvd->max_resp_sz < sent->max_resp_sz)
5141                 return -EINVAL;
5142         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5143                 return -EINVAL;
5144         /* These would render the backchannel useless: */
5145         if (rcvd->max_ops  == 0)
5146                 return -EINVAL;
5147         if (rcvd->max_reqs == 0)
5148                 return -EINVAL;
5149         return 0;
5150 }
5151
5152 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5153                                      struct nfs4_session *session)
5154 {
5155         int ret;
5156
5157         ret = nfs4_verify_fore_channel_attrs(args, session);
5158         if (ret)
5159                 return ret;
5160         return nfs4_verify_back_channel_attrs(args, session);
5161 }
5162
5163 static int _nfs4_proc_create_session(struct nfs_client *clp)
5164 {
5165         struct nfs4_session *session = clp->cl_session;
5166         struct nfs41_create_session_args args = {
5167                 .client = clp,
5168                 .cb_program = NFS4_CALLBACK,
5169         };
5170         struct nfs41_create_session_res res = {
5171                 .client = clp,
5172         };
5173         struct rpc_message msg = {
5174                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5175                 .rpc_argp = &args,
5176                 .rpc_resp = &res,
5177         };
5178         int status;
5179
5180         nfs4_init_channel_attrs(&args);
5181         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5182
5183         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5184
5185         if (!status)
5186                 /* Verify the session's negotiated channel_attrs values */
5187                 status = nfs4_verify_channel_attrs(&args, session);
5188         if (!status) {
5189                 /* Increment the clientid slot sequence id */
5190                 clp->cl_seqid++;
5191         }
5192
5193         return status;
5194 }
5195
5196 /*
5197  * Issues a CREATE_SESSION operation to the server.
5198  * It is the responsibility of the caller to verify the session is
5199  * expired before calling this routine.
5200  */
5201 int nfs4_proc_create_session(struct nfs_client *clp)
5202 {
5203         int status;
5204         unsigned *ptr;
5205         struct nfs4_session *session = clp->cl_session;
5206         long timeout = 0;
5207         int err;
5208
5209         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5210
5211         do {
5212                 status = _nfs4_proc_create_session(clp);
5213                 if (status == -NFS4ERR_DELAY) {
5214                         err = nfs4_delay(clp->cl_rpcclient, &timeout);
5215                         if (err)
5216                                 status = err;
5217                 }
5218         } while (status == -NFS4ERR_DELAY);
5219
5220         if (status)
5221                 goto out;
5222
5223         /* Init and reset the fore channel */
5224         status = nfs4_init_slot_tables(session);
5225         dprintk("slot table initialization returned %d\n", status);
5226         if (status)
5227                 goto out;
5228         status = nfs4_reset_slot_tables(session);
5229         dprintk("slot table reset returned %d\n", status);
5230         if (status)
5231                 goto out;
5232
5233         ptr = (unsigned *)&session->sess_id.data[0];
5234         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5235                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5236 out:
5237         dprintk("<-- %s\n", __func__);
5238         return status;
5239 }
5240
5241 /*
5242  * Issue the over-the-wire RPC DESTROY_SESSION.
5243  * The caller must serialize access to this routine.
5244  */
5245 int nfs4_proc_destroy_session(struct nfs4_session *session)
5246 {
5247         int status = 0;
5248         struct rpc_message msg;
5249
5250         dprintk("--> nfs4_proc_destroy_session\n");
5251
5252         /* session is still being setup */
5253         if (session->clp->cl_cons_state != NFS_CS_READY)
5254                 return status;
5255
5256         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5257         msg.rpc_argp = session;
5258         msg.rpc_resp = NULL;
5259         msg.rpc_cred = NULL;
5260         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5261
5262         if (status)
5263                 printk(KERN_WARNING
5264                         "Got error %d from the server on DESTROY_SESSION. "
5265                         "Session has been destroyed regardless...\n", status);
5266
5267         dprintk("<-- nfs4_proc_destroy_session\n");
5268         return status;
5269 }
5270
5271 int nfs4_init_session(struct nfs_server *server)
5272 {
5273         struct nfs_client *clp = server->nfs_client;
5274         struct nfs4_session *session;
5275         unsigned int rsize, wsize;
5276         int ret;
5277
5278         if (!nfs4_has_session(clp))
5279                 return 0;
5280
5281         session = clp->cl_session;
5282         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5283                 return 0;
5284
5285         rsize = server->rsize;
5286         if (rsize == 0)
5287                 rsize = NFS_MAX_FILE_IO_SIZE;
5288         wsize = server->wsize;
5289         if (wsize == 0)
5290                 wsize = NFS_MAX_FILE_IO_SIZE;
5291
5292         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5293         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5294
5295         ret = nfs4_recover_expired_lease(server);
5296         if (!ret)
5297                 ret = nfs4_check_client_ready(clp);
5298         return ret;
5299 }
5300
5301 int nfs4_init_ds_session(struct nfs_client *clp)
5302 {
5303         struct nfs4_session *session = clp->cl_session;
5304         int ret;
5305
5306         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5307                 return 0;
5308
5309         ret = nfs4_client_recover_expired_lease(clp);
5310         if (!ret)
5311                 /* Test for the DS role */
5312                 if (!is_ds_client(clp))
5313                         ret = -ENODEV;
5314         if (!ret)
5315                 ret = nfs4_check_client_ready(clp);
5316         return ret;
5317
5318 }
5319 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5320
5321
5322 /*
5323  * Renew the cl_session lease.
5324  */
5325 struct nfs4_sequence_data {
5326         struct nfs_client *clp;
5327         struct nfs4_sequence_args args;
5328         struct nfs4_sequence_res res;
5329 };
5330
5331 static void nfs41_sequence_release(void *data)
5332 {
5333         struct nfs4_sequence_data *calldata = data;
5334         struct nfs_client *clp = calldata->clp;
5335
5336         if (atomic_read(&clp->cl_count) > 1)
5337                 nfs4_schedule_state_renewal(clp);
5338         nfs_put_client(clp);
5339         kfree(calldata);
5340 }
5341
5342 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5343 {
5344         switch(task->tk_status) {
5345         case -NFS4ERR_DELAY:
5346                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5347                 return -EAGAIN;
5348         default:
5349                 nfs4_schedule_lease_recovery(clp);
5350         }
5351         return 0;
5352 }
5353
5354 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5355 {
5356         struct nfs4_sequence_data *calldata = data;
5357         struct nfs_client *clp = calldata->clp;
5358
5359         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5360                 return;
5361
5362         if (task->tk_status < 0) {
5363                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5364                 if (atomic_read(&clp->cl_count) == 1)
5365                         goto out;
5366
5367                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5368                         rpc_restart_call_prepare(task);
5369                         return;
5370                 }
5371         }
5372         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5373 out:
5374         dprintk("<-- %s\n", __func__);
5375 }
5376
5377 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5378 {
5379         struct nfs4_sequence_data *calldata = data;
5380         struct nfs_client *clp = calldata->clp;
5381         struct nfs4_sequence_args *args;
5382         struct nfs4_sequence_res *res;
5383
5384         args = task->tk_msg.rpc_argp;
5385         res = task->tk_msg.rpc_resp;
5386
5387         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5388                 return;
5389         rpc_call_start(task);
5390 }
5391
5392 static const struct rpc_call_ops nfs41_sequence_ops = {
5393         .rpc_call_done = nfs41_sequence_call_done,
5394         .rpc_call_prepare = nfs41_sequence_prepare,
5395         .rpc_release = nfs41_sequence_release,
5396 };
5397
5398 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5399 {
5400         struct nfs4_sequence_data *calldata;
5401         struct rpc_message msg = {
5402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5403                 .rpc_cred = cred,
5404         };
5405         struct rpc_task_setup task_setup_data = {
5406                 .rpc_client = clp->cl_rpcclient,
5407                 .rpc_message = &msg,
5408                 .callback_ops = &nfs41_sequence_ops,
5409                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5410         };
5411
5412         if (!atomic_inc_not_zero(&clp->cl_count))
5413                 return ERR_PTR(-EIO);
5414         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5415         if (calldata == NULL) {
5416                 nfs_put_client(clp);
5417                 return ERR_PTR(-ENOMEM);
5418         }
5419         msg.rpc_argp = &calldata->args;
5420         msg.rpc_resp = &calldata->res;
5421         calldata->clp = clp;
5422         task_setup_data.callback_data = calldata;
5423
5424         return rpc_run_task(&task_setup_data);
5425 }
5426
5427 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5428 {
5429         struct rpc_task *task;
5430         int ret = 0;
5431
5432         task = _nfs41_proc_sequence(clp, cred);
5433         if (IS_ERR(task))
5434                 ret = PTR_ERR(task);
5435         else
5436                 rpc_put_task_async(task);
5437         dprintk("<-- %s status=%d\n", __func__, ret);
5438         return ret;
5439 }
5440
5441 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5442 {
5443         struct rpc_task *task;
5444         int ret;
5445
5446         task = _nfs41_proc_sequence(clp, cred);
5447         if (IS_ERR(task)) {
5448                 ret = PTR_ERR(task);
5449                 goto out;
5450         }
5451         ret = rpc_wait_for_completion_task(task);
5452         if (!ret) {
5453                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5454
5455                 if (task->tk_status == 0)
5456                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5457                 ret = task->tk_status;
5458         }
5459         rpc_put_task(task);
5460 out:
5461         dprintk("<-- %s status=%d\n", __func__, ret);
5462         return ret;
5463 }
5464
5465 struct nfs4_reclaim_complete_data {
5466         struct nfs_client *clp;
5467         struct nfs41_reclaim_complete_args arg;
5468         struct nfs41_reclaim_complete_res res;
5469 };
5470
5471 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5472 {
5473         struct nfs4_reclaim_complete_data *calldata = data;
5474
5475         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5476         if (nfs41_setup_sequence(calldata->clp->cl_session,
5477                                 &calldata->arg.seq_args,
5478                                 &calldata->res.seq_res, 0, task))
5479                 return;
5480
5481         rpc_call_start(task);
5482 }
5483
5484 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5485 {
5486         switch(task->tk_status) {
5487         case 0:
5488         case -NFS4ERR_COMPLETE_ALREADY:
5489         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5490                 break;
5491         case -NFS4ERR_DELAY:
5492                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5493                 return -EAGAIN;
5494         default:
5495                 nfs4_schedule_lease_recovery(clp);
5496         }
5497         return 0;
5498 }
5499
5500 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5501 {
5502         struct nfs4_reclaim_complete_data *calldata = data;
5503         struct nfs_client *clp = calldata->clp;
5504         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5505
5506         dprintk("--> %s\n", __func__);
5507         if (!nfs41_sequence_done(task, res))
5508                 return;
5509
5510         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5511                 rpc_restart_call_prepare(task);
5512                 return;
5513         }
5514         dprintk("<-- %s\n", __func__);
5515 }
5516
5517 static void nfs4_free_reclaim_complete_data(void *data)
5518 {
5519         struct nfs4_reclaim_complete_data *calldata = data;
5520
5521         kfree(calldata);
5522 }
5523
5524 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5525         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5526         .rpc_call_done = nfs4_reclaim_complete_done,
5527         .rpc_release = nfs4_free_reclaim_complete_data,
5528 };
5529
5530 /*
5531  * Issue a global reclaim complete.
5532  */
5533 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5534 {
5535         struct nfs4_reclaim_complete_data *calldata;
5536         struct rpc_task *task;
5537         struct rpc_message msg = {
5538                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5539         };
5540         struct rpc_task_setup task_setup_data = {
5541                 .rpc_client = clp->cl_rpcclient,
5542                 .rpc_message = &msg,
5543                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5544                 .flags = RPC_TASK_ASYNC,
5545         };
5546         int status = -ENOMEM;
5547
5548         dprintk("--> %s\n", __func__);
5549         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5550         if (calldata == NULL)
5551                 goto out;
5552         calldata->clp = clp;
5553         calldata->arg.one_fs = 0;
5554
5555         msg.rpc_argp = &calldata->arg;
5556         msg.rpc_resp = &calldata->res;
5557         task_setup_data.callback_data = calldata;
5558         task = rpc_run_task(&task_setup_data);
5559         if (IS_ERR(task)) {
5560                 status = PTR_ERR(task);
5561                 goto out;
5562         }
5563         status = nfs4_wait_for_completion_rpc_task(task);
5564         if (status == 0)
5565                 status = task->tk_status;
5566         rpc_put_task(task);
5567         return 0;
5568 out:
5569         dprintk("<-- %s status=%d\n", __func__, status);
5570         return status;
5571 }
5572
5573 static void
5574 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5575 {
5576         struct nfs4_layoutget *lgp = calldata;
5577         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5578
5579         dprintk("--> %s\n", __func__);
5580         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5581          * right now covering the LAYOUTGET we are about to send.
5582          * However, that is not so catastrophic, and there seems
5583          * to be no way to prevent it completely.
5584          */
5585         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5586                                 &lgp->res.seq_res, 0, task))
5587                 return;
5588         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5589                                           NFS_I(lgp->args.inode)->layout,
5590                                           lgp->args.ctx->state)) {
5591                 rpc_exit(task, NFS4_OK);
5592                 return;
5593         }
5594         rpc_call_start(task);
5595 }
5596
5597 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5598 {
5599         struct nfs4_layoutget *lgp = calldata;
5600         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5601
5602         dprintk("--> %s\n", __func__);
5603
5604         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5605                 return;
5606
5607         switch (task->tk_status) {
5608         case 0:
5609                 break;
5610         case -NFS4ERR_LAYOUTTRYLATER:
5611         case -NFS4ERR_RECALLCONFLICT:
5612                 task->tk_status = -NFS4ERR_DELAY;
5613                 /* Fall through */
5614         default:
5615                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5616                         rpc_restart_call_prepare(task);
5617                         return;
5618                 }
5619         }
5620         dprintk("<-- %s\n", __func__);
5621 }
5622
5623 static void nfs4_layoutget_release(void *calldata)
5624 {
5625         struct nfs4_layoutget *lgp = calldata;
5626
5627         dprintk("--> %s\n", __func__);
5628         put_nfs_open_context(lgp->args.ctx);
5629         kfree(calldata);
5630         dprintk("<-- %s\n", __func__);
5631 }
5632
5633 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5634         .rpc_call_prepare = nfs4_layoutget_prepare,
5635         .rpc_call_done = nfs4_layoutget_done,
5636         .rpc_release = nfs4_layoutget_release,
5637 };
5638
5639 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5640 {
5641         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5642         struct rpc_task *task;
5643         struct rpc_message msg = {
5644                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5645                 .rpc_argp = &lgp->args,
5646                 .rpc_resp = &lgp->res,
5647         };
5648         struct rpc_task_setup task_setup_data = {
5649                 .rpc_client = server->client,
5650                 .rpc_message = &msg,
5651                 .callback_ops = &nfs4_layoutget_call_ops,
5652                 .callback_data = lgp,
5653                 .flags = RPC_TASK_ASYNC,
5654         };
5655         int status = 0;
5656
5657         dprintk("--> %s\n", __func__);
5658
5659         lgp->res.layoutp = &lgp->args.layout;
5660         lgp->res.seq_res.sr_slot = NULL;
5661         task = rpc_run_task(&task_setup_data);
5662         if (IS_ERR(task))
5663                 return PTR_ERR(task);
5664         status = nfs4_wait_for_completion_rpc_task(task);
5665         if (status == 0)
5666                 status = task->tk_status;
5667         if (status == 0)
5668                 status = pnfs_layout_process(lgp);
5669         rpc_put_task(task);
5670         dprintk("<-- %s status=%d\n", __func__, status);
5671         return status;
5672 }
5673
5674 static int
5675 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5676 {
5677         struct nfs4_getdeviceinfo_args args = {
5678                 .pdev = pdev,
5679         };
5680         struct nfs4_getdeviceinfo_res res = {
5681                 .pdev = pdev,
5682         };
5683         struct rpc_message msg = {
5684                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5685                 .rpc_argp = &args,
5686                 .rpc_resp = &res,
5687         };
5688         int status;
5689
5690         dprintk("--> %s\n", __func__);
5691         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5692         dprintk("<-- %s status=%d\n", __func__, status);
5693
5694         return status;
5695 }
5696
5697 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5698 {
5699         struct nfs4_exception exception = { };
5700         int err;
5701
5702         do {
5703                 err = nfs4_handle_exception(server,
5704                                         _nfs4_proc_getdeviceinfo(server, pdev),
5705                                         &exception);
5706         } while (exception.retry);
5707         return err;
5708 }
5709 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5710
5711 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5712 {
5713         struct nfs4_layoutcommit_data *data = calldata;
5714         struct nfs_server *server = NFS_SERVER(data->args.inode);
5715
5716         if (nfs4_setup_sequence(server, &data->args.seq_args,
5717                                 &data->res.seq_res, 1, task))
5718                 return;
5719         rpc_call_start(task);
5720 }
5721
5722 static void
5723 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5724 {
5725         struct nfs4_layoutcommit_data *data = calldata;
5726         struct nfs_server *server = NFS_SERVER(data->args.inode);
5727
5728         if (!nfs4_sequence_done(task, &data->res.seq_res))
5729                 return;
5730
5731         switch (task->tk_status) { /* Just ignore these failures */
5732         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5733         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5734         case NFS4ERR_BADLAYOUT:     /* no layout */
5735         case NFS4ERR_GRACE:         /* loca_recalim always false */
5736                 task->tk_status = 0;
5737         }
5738
5739         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5740                 nfs_restart_rpc(task, server->nfs_client);
5741                 return;
5742         }
5743
5744         if (task->tk_status == 0)
5745                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5746                                                    data->res.fattr);
5747 }
5748
5749 static void nfs4_layoutcommit_release(void *calldata)
5750 {
5751         struct nfs4_layoutcommit_data *data = calldata;
5752
5753         /* Matched by references in pnfs_set_layoutcommit */
5754         put_lseg(data->lseg);
5755         put_rpccred(data->cred);
5756         kfree(data);
5757 }
5758
5759 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5760         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5761         .rpc_call_done = nfs4_layoutcommit_done,
5762         .rpc_release = nfs4_layoutcommit_release,
5763 };
5764
5765 int
5766 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5767 {
5768         struct rpc_message msg = {
5769                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5770                 .rpc_argp = &data->args,
5771                 .rpc_resp = &data->res,
5772                 .rpc_cred = data->cred,
5773         };
5774         struct rpc_task_setup task_setup_data = {
5775                 .task = &data->task,
5776                 .rpc_client = NFS_CLIENT(data->args.inode),
5777                 .rpc_message = &msg,
5778                 .callback_ops = &nfs4_layoutcommit_ops,
5779                 .callback_data = data,
5780                 .flags = RPC_TASK_ASYNC,
5781         };
5782         struct rpc_task *task;
5783         int status = 0;
5784
5785         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5786                 "lbw: %llu inode %lu\n",
5787                 data->task.tk_pid, sync,
5788                 data->args.lastbytewritten,
5789                 data->args.inode->i_ino);
5790
5791         task = rpc_run_task(&task_setup_data);
5792         if (IS_ERR(task))
5793                 return PTR_ERR(task);
5794         if (sync == false)
5795                 goto out;
5796         status = nfs4_wait_for_completion_rpc_task(task);
5797         if (status != 0)
5798                 goto out;
5799         status = task->tk_status;
5800 out:
5801         dprintk("%s: status %d\n", __func__, status);
5802         rpc_put_task(task);
5803         return status;
5804 }
5805 #endif /* CONFIG_NFS_V4_1 */
5806
5807 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5808         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5809         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5810         .recover_open   = nfs4_open_reclaim,
5811         .recover_lock   = nfs4_lock_reclaim,
5812         .establish_clid = nfs4_init_clientid,
5813         .get_clid_cred  = nfs4_get_setclientid_cred,
5814 };
5815
5816 #if defined(CONFIG_NFS_V4_1)
5817 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5818         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5819         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5820         .recover_open   = nfs4_open_reclaim,
5821         .recover_lock   = nfs4_lock_reclaim,
5822         .establish_clid = nfs41_init_clientid,
5823         .get_clid_cred  = nfs4_get_exchange_id_cred,
5824         .reclaim_complete = nfs41_proc_reclaim_complete,
5825 };
5826 #endif /* CONFIG_NFS_V4_1 */
5827
5828 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5829         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5830         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5831         .recover_open   = nfs4_open_expired,
5832         .recover_lock   = nfs4_lock_expired,
5833         .establish_clid = nfs4_init_clientid,
5834         .get_clid_cred  = nfs4_get_setclientid_cred,
5835 };
5836
5837 #if defined(CONFIG_NFS_V4_1)
5838 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5839         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5840         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5841         .recover_open   = nfs4_open_expired,
5842         .recover_lock   = nfs4_lock_expired,
5843         .establish_clid = nfs41_init_clientid,
5844         .get_clid_cred  = nfs4_get_exchange_id_cred,
5845 };
5846 #endif /* CONFIG_NFS_V4_1 */
5847
5848 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5849         .sched_state_renewal = nfs4_proc_async_renew,
5850         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5851         .renew_lease = nfs4_proc_renew,
5852 };
5853
5854 #if defined(CONFIG_NFS_V4_1)
5855 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5856         .sched_state_renewal = nfs41_proc_async_sequence,
5857         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5858         .renew_lease = nfs4_proc_sequence,
5859 };
5860 #endif
5861
5862 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5863         .minor_version = 0,
5864         .call_sync = _nfs4_call_sync,
5865         .validate_stateid = nfs4_validate_delegation_stateid,
5866         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5867         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5868         .state_renewal_ops = &nfs40_state_renewal_ops,
5869 };
5870
5871 #if defined(CONFIG_NFS_V4_1)
5872 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5873         .minor_version = 1,
5874         .call_sync = _nfs4_call_sync_session,
5875         .validate_stateid = nfs41_validate_delegation_stateid,
5876         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5877         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5878         .state_renewal_ops = &nfs41_state_renewal_ops,
5879 };
5880 #endif
5881
5882 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5883         [0] = &nfs_v4_0_minor_ops,
5884 #if defined(CONFIG_NFS_V4_1)
5885         [1] = &nfs_v4_1_minor_ops,
5886 #endif
5887 };
5888
5889 static const struct inode_operations nfs4_file_inode_operations = {
5890         .permission     = nfs_permission,
5891         .getattr        = nfs_getattr,
5892         .setattr        = nfs_setattr,
5893         .getxattr       = generic_getxattr,
5894         .setxattr       = generic_setxattr,
5895         .listxattr      = generic_listxattr,
5896         .removexattr    = generic_removexattr,
5897 };
5898
5899 const struct nfs_rpc_ops nfs_v4_clientops = {
5900         .version        = 4,                    /* protocol version */
5901         .dentry_ops     = &nfs4_dentry_operations,
5902         .dir_inode_ops  = &nfs4_dir_inode_operations,
5903         .file_inode_ops = &nfs4_file_inode_operations,
5904         .getroot        = nfs4_proc_get_root,
5905         .getattr        = nfs4_proc_getattr,
5906         .setattr        = nfs4_proc_setattr,
5907         .lookupfh       = nfs4_proc_lookupfh,
5908         .lookup         = nfs4_proc_lookup,
5909         .access         = nfs4_proc_access,
5910         .readlink       = nfs4_proc_readlink,
5911         .create         = nfs4_proc_create,
5912         .remove         = nfs4_proc_remove,
5913         .unlink_setup   = nfs4_proc_unlink_setup,
5914         .unlink_done    = nfs4_proc_unlink_done,
5915         .rename         = nfs4_proc_rename,
5916         .rename_setup   = nfs4_proc_rename_setup,
5917         .rename_done    = nfs4_proc_rename_done,
5918         .link           = nfs4_proc_link,
5919         .symlink        = nfs4_proc_symlink,
5920         .mkdir          = nfs4_proc_mkdir,
5921         .rmdir          = nfs4_proc_remove,
5922         .readdir        = nfs4_proc_readdir,
5923         .mknod          = nfs4_proc_mknod,
5924         .statfs         = nfs4_proc_statfs,
5925         .fsinfo         = nfs4_proc_fsinfo,
5926         .pathconf       = nfs4_proc_pathconf,
5927         .set_capabilities = nfs4_server_capabilities,
5928         .decode_dirent  = nfs4_decode_dirent,
5929         .read_setup     = nfs4_proc_read_setup,
5930         .read_done      = nfs4_read_done,
5931         .write_setup    = nfs4_proc_write_setup,
5932         .write_done     = nfs4_write_done,
5933         .commit_setup   = nfs4_proc_commit_setup,
5934         .commit_done    = nfs4_commit_done,
5935         .lock           = nfs4_proc_lock,
5936         .clear_acl_cache = nfs4_zap_acl_attr,
5937         .close_context  = nfs4_close_context,
5938         .open_context   = nfs4_atomic_open,
5939         .init_client    = nfs4_init_client,
5940         .secinfo        = nfs4_proc_secinfo,
5941 };
5942
5943 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
5944         .prefix = XATTR_NAME_NFSV4_ACL,
5945         .list   = nfs4_xattr_list_nfs4_acl,
5946         .get    = nfs4_xattr_get_nfs4_acl,
5947         .set    = nfs4_xattr_set_nfs4_acl,
5948 };
5949
5950 const struct xattr_handler *nfs4_xattr_handlers[] = {
5951         &nfs4_xattr_nfs4_acl_handler,
5952         NULL
5953 };
5954
5955 /*
5956  * Local variables:
5957  *  c-basic-offset: 8
5958  * End:
5959  */