fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/sunrpc/bc_xprt.h>
  56 #include <linux/xattr.h>
  57 #include <linux/utsname.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65
  66 #define NFSDBG_FACILITY         NFSDBG_PROC
  67
  68 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  69 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  70
  71 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  72
  73 struct nfs4_opendata;
  74 static int _nfs4_proc_open(struct nfs4_opendata *data);
  75 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  76 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  77 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  78 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  79 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  80                             struct nfs_fattr *fattr, struct iattr *sattr,
  81                             struct nfs4_state *state);
  82 #ifdef CONFIG_NFS_V4_1
  83 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  84 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  85 #endif
  86 /* Prevent leaks of NFSv4 errors into userland */
  87 static int nfs4_map_errors(int err)
  88 {
  89         if (err >= -1000)
  90                 return err;
  91         switch (err) {
  92         case -NFS4ERR_RESOURCE:
  93                 return -EREMOTEIO;
  94         case -NFS4ERR_WRONGSEC:
  95                 return -EPERM;
  96         case -NFS4ERR_BADOWNER:
  97         case -NFS4ERR_BADNAME:
  98                 return -EINVAL;
  99         default:
 100                 dprintk("%s could not handle NFSv4 error %d\n",
 101                                 __func__, -err);
 102                 break;
 103         }
 104         return -EIO;
 105 }
 106
 107 /*
 108  * This is our standard bitmap for GETATTR requests.
 109  */
 110 const u32 nfs4_fattr_bitmap[2] = {
 111         FATTR4_WORD0_TYPE
 112         | FATTR4_WORD0_CHANGE
 113         | FATTR4_WORD0_SIZE
 114         | FATTR4_WORD0_FSID
 115         | FATTR4_WORD0_FILEID,
 116         FATTR4_WORD1_MODE
 117         | FATTR4_WORD1_NUMLINKS
 118         | FATTR4_WORD1_OWNER
 119         | FATTR4_WORD1_OWNER_GROUP
 120         | FATTR4_WORD1_RAWDEV
 121         | FATTR4_WORD1_SPACE_USED
 122         | FATTR4_WORD1_TIME_ACCESS
 123         | FATTR4_WORD1_TIME_METADATA
 124         | FATTR4_WORD1_TIME_MODIFY
 125 };
 126
 127 const u32 nfs4_statfs_bitmap[2] = {
 128         FATTR4_WORD0_FILES_AVAIL
 129         | FATTR4_WORD0_FILES_FREE
 130         | FATTR4_WORD0_FILES_TOTAL,
 131         FATTR4_WORD1_SPACE_AVAIL
 132         | FATTR4_WORD1_SPACE_FREE
 133         | FATTR4_WORD1_SPACE_TOTAL
 134 };
 135
 136 const u32 nfs4_pathconf_bitmap[2] = {
 137         FATTR4_WORD0_MAXLINK
 138         | FATTR4_WORD0_MAXNAME,
 139         0
 140 };
 141
 142 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 143                         | FATTR4_WORD0_MAXREAD
 144                         | FATTR4_WORD0_MAXWRITE
 145                         | FATTR4_WORD0_LEASE_TIME,
 146                         FATTR4_WORD1_TIME_DELTA
 147                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 148                         FATTR4_WORD2_LAYOUT_BLKSIZE
 149 };
 150
 151 const u32 nfs4_fs_locations_bitmap[2] = {
 152         FATTR4_WORD0_TYPE
 153         | FATTR4_WORD0_CHANGE
 154         | FATTR4_WORD0_SIZE
 155         | FATTR4_WORD0_FSID
 156         | FATTR4_WORD0_FILEID
 157         | FATTR4_WORD0_FS_LOCATIONS,
 158         FATTR4_WORD1_MODE
 159         | FATTR4_WORD1_NUMLINKS
 160         | FATTR4_WORD1_OWNER
 161         | FATTR4_WORD1_OWNER_GROUP
 162         | FATTR4_WORD1_RAWDEV
 163         | FATTR4_WORD1_SPACE_USED
 164         | FATTR4_WORD1_TIME_ACCESS
 165         | FATTR4_WORD1_TIME_METADATA
 166         | FATTR4_WORD1_TIME_MODIFY
 167         | FATTR4_WORD1_MOUNTED_ON_FILEID
 168 };
 169
 170 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 171                 struct nfs4_readdir_arg *readdir)
 172 {
 173         __be32 *start, *p;
 174
 175         BUG_ON(readdir->count < 80);
 176         if (cookie > 2) {
 177                 readdir->cookie = cookie;
 178                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 179                 return;
 180         }
 181
 182         readdir->cookie = 0;
 183         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 184         if (cookie == 2)
 185                 return;
 186
 187         /*
 188          * NFSv4 servers do not return entries for '.' and '..'
 189          * Therefore, we fake these entries here.  We let '.'
 190          * have cookie 0 and '..' have cookie 1.  Note that
 191          * when talking to the server, we always send cookie 0
 192          * instead of 1 or 2.
 193          */
 194         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 195
 196         if (cookie == 0) {
 197                 *p++ = xdr_one;                                  /* next */
 198                 *p++ = xdr_zero;                   /* cookie, first word */
 199                 *p++ = xdr_one;                   /* cookie, second word */
 200                 *p++ = xdr_one;                             /* entry len */
 201                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 202                 p++;
 203                 *p++ = xdr_one;                         /* bitmap length */
 204                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 205                 *p++ = htonl(8);              /* attribute buffer length */
 206                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 207         }
 208
 209         *p++ = xdr_one;                                  /* next */
 210         *p++ = xdr_zero;                   /* cookie, first word */
 211         *p++ = xdr_two;                   /* cookie, second word */
 212         *p++ = xdr_two;                             /* entry len */
 213         memcpy(p, "..\0\0", 4);                         /* entry */
 214         p++;
 215         *p++ = xdr_one;                         /* bitmap length */
 216         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 217         *p++ = htonl(8);              /* attribute buffer length */
 218         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 219
 220         readdir->pgbase = (char *)p - (char *)start;
 221         readdir->count -= readdir->pgbase;
 222         kunmap_atomic(start, KM_USER0);
 223 }
 224
 225 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 226 {
 227         int res;
 228
 229         might_sleep();
 230
 231         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 232                         nfs_wait_bit_killable, TASK_KILLABLE);
 233         return res;
 234 }
 235
 236 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 237 {
 238         int res = 0;
 239
 240         might_sleep();
 241
 242         if (*timeout <= 0)
 243                 *timeout = NFS4_POLL_RETRY_MIN;
 244         if (*timeout > NFS4_POLL_RETRY_MAX)
 245                 *timeout = NFS4_POLL_RETRY_MAX;
 246         schedule_timeout_killable(*timeout);
 247         if (fatal_signal_pending(current))
 248                 res = -ERESTARTSYS;
 249         *timeout <<= 1;
 250         return res;
 251 }
 252
 253 /* This is the error handling routine for processes that are allowed
 254  * to sleep.
 255  */
 256 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 257 {
 258         struct nfs_client *clp = server->nfs_client;
 259         struct nfs4_state *state = exception->state;
 260         int ret = errorcode;
 261
 262         exception->retry = 0;
 263         switch(errorcode) {
 264                 case 0:
 265                         return 0;
 266                 case -NFS4ERR_ADMIN_REVOKED:
 267                 case -NFS4ERR_BAD_STATEID:
 268                 case -NFS4ERR_OPENMODE:
 269                         if (state == NULL)
 270                                 break;
 271                         nfs4_schedule_stateid_recovery(server, state);
 272                         goto wait_on_recovery;
 273                 case -NFS4ERR_EXPIRED:
 274                         if (state != NULL)
 275                                 nfs4_schedule_stateid_recovery(server, state);
 276                 case -NFS4ERR_STALE_STATEID:
 277                 case -NFS4ERR_STALE_CLIENTID:
 278                         nfs4_schedule_lease_recovery(clp);
 279                         goto wait_on_recovery;
 280 #if defined(CONFIG_NFS_V4_1)
 281                 case -NFS4ERR_BADSESSION:
 282                 case -NFS4ERR_BADSLOT:
 283                 case -NFS4ERR_BAD_HIGH_SLOT:
 284                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 285                 case -NFS4ERR_DEADSESSION:
 286                 case -NFS4ERR_SEQ_FALSE_RETRY:
 287                 case -NFS4ERR_SEQ_MISORDERED:
 288                         dprintk("%s ERROR: %d Reset session\n", __func__,
 289                                 errorcode);
 290                         nfs4_schedule_session_recovery(clp->cl_session);
 291                         exception->retry = 1;
 292                         break;
 293 #endif /* defined(CONFIG_NFS_V4_1) */
 294                 case -NFS4ERR_FILE_OPEN:
 295                         if (exception->timeout > HZ) {
 296                                 /* We have retried a decent amount, time to
 297                                  * fail
 298                                  */
 299                                 ret = -EBUSY;
 300                                 break;
 301                         }
 302                 case -NFS4ERR_GRACE:
 303                 case -NFS4ERR_DELAY:
 304                 case -EKEYEXPIRED:
 305                         ret = nfs4_delay(server->client, &exception->timeout);
 306                         if (ret != 0)
 307                                 break;
 308                 case -NFS4ERR_RETRY_UNCACHED_REP:
 309                 case -NFS4ERR_OLD_STATEID:
 310                         exception->retry = 1;
 311                         break;
 312                 case -NFS4ERR_BADOWNER:
 313                         /* The following works around a Linux server bug! */
 314                 case -NFS4ERR_BADNAME:
 315                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 316                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 317                                 exception->retry = 1;
 318                                 printk(KERN_WARNING "NFS: v4 server %s "
 319                                                 "does not accept raw "
 320                                                 "uid/gids. "
 321                                                 "Reenabling the idmapper.\n",
 322                                                 server->nfs_client->cl_hostname);
 323                         }
 324         }
 325         /* We failed to handle the error */
 326         return nfs4_map_errors(ret);
 327 wait_on_recovery:
 328         ret = nfs4_wait_clnt_recover(clp);
 329         if (ret == 0)
 330                 exception->retry = 1;
 331         return ret;
 332 }
 333
 334
 335 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 336 {
 337         spin_lock(&clp->cl_lock);
 338         if (time_before(clp->cl_last_renewal,timestamp))
 339                 clp->cl_last_renewal = timestamp;
 340         spin_unlock(&clp->cl_lock);
 341 }
 342
 343 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 344 {
 345         do_renew_lease(server->nfs_client, timestamp);
 346 }
 347
 348 #if defined(CONFIG_NFS_V4_1)
 349
 350 /*
 351  * nfs4_free_slot - free a slot and efficiently update slot table.
 352  *
 353  * freeing a slot is trivially done by clearing its respective bit
 354  * in the bitmap.
 355  * If the freed slotid equals highest_used_slotid we want to update it
 356  * so that the server would be able to size down the slot table if needed,
 357  * otherwise we know that the highest_used_slotid is still in use.
 358  * When updating highest_used_slotid there may be "holes" in the bitmap
 359  * so we need to scan down from highest_used_slotid to 0 looking for the now
 360  * highest slotid in use.
 361  * If none found, highest_used_slotid is set to -1.
 362  *
 363  * Must be called while holding tbl->slot_tbl_lock
 364  */
 365 static void
 366 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 367 {
 368         int free_slotid = free_slot - tbl->slots;
 369         int slotid = free_slotid;
 370
 371         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 372         /* clear used bit in bitmap */
 373         __clear_bit(slotid, tbl->used_slots);
 374
 375         /* update highest_used_slotid when it is freed */
 376         if (slotid == tbl->highest_used_slotid) {
 377                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 378                 if (slotid < tbl->max_slots)
 379                         tbl->highest_used_slotid = slotid;
 380                 else
 381                         tbl->highest_used_slotid = -1;
 382         }
 383         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 384                 free_slotid, tbl->highest_used_slotid);
 385 }
 386
 387 /*
 388  * Signal state manager thread if session fore channel is drained
 389  */
 390 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 391 {
 392         struct rpc_task *task;
 393
 394         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 395                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 396                 if (task)
 397                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 398                 return;
 399         }
 400
 401         if (ses->fc_slot_table.highest_used_slotid != -1)
 402                 return;
 403
 404         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 405         complete(&ses->fc_slot_table.complete);
 406 }
 407
 408 /*
 409  * Signal state manager thread if session back channel is drained
 410  */
 411 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 412 {
 413         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 414             ses->bc_slot_table.highest_used_slotid != -1)
 415                 return;
 416         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 417         complete(&ses->bc_slot_table.complete);
 418 }
 419
 420 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 421 {
 422         struct nfs4_slot_table *tbl;
 423
 424         tbl = &res->sr_session->fc_slot_table;
 425         if (!res->sr_slot) {
 426                 /* just wake up the next guy waiting since
 427                  * we may have not consumed a slot after all */
 428                 dprintk("%s: No slot\n", __func__);
 429                 return;
 430         }
 431
 432         spin_lock(&tbl->slot_tbl_lock);
 433         nfs4_free_slot(tbl, res->sr_slot);
 434         nfs4_check_drain_fc_complete(res->sr_session);
 435         spin_unlock(&tbl->slot_tbl_lock);
 436         res->sr_slot = NULL;
 437 }
 438
 439 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 440 {
 441         unsigned long timestamp;
 442         struct nfs_client *clp;
 443
 444         /*
 445          * sr_status remains 1 if an RPC level error occurred. The server
 446          * may or may not have processed the sequence operation..
 447          * Proceed as if the server received and processed the sequence
 448          * operation.
 449          */
 450         if (res->sr_status == 1)
 451                 res->sr_status = NFS_OK;
 452
 453         /* don't increment the sequence number if the task wasn't sent */
 454         if (!RPC_WAS_SENT(task))
 455                 goto out;
 456
 457         /* Check the SEQUENCE operation status */
 458         switch (res->sr_status) {
 459         case 0:
 460                 /* Update the slot's sequence and clientid lease timer */
 461                 ++res->sr_slot->seq_nr;
 462                 timestamp = res->sr_renewal_time;
 463                 clp = res->sr_session->clp;
 464                 do_renew_lease(clp, timestamp);
 465                 /* Check sequence flags */
 466                 if (res->sr_status_flags != 0)
 467                         nfs4_schedule_lease_recovery(clp);
 468                 break;
 469         case -NFS4ERR_DELAY:
 470                 /* The server detected a resend of the RPC call and
 471                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 472                  * of RFC5661.
 473                  */
 474                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 475                         __func__,
 476                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 477                         res->sr_slot->seq_nr);
 478                 goto out_retry;
 479         default:
 480                 /* Just update the slot sequence no. */
 481                 ++res->sr_slot->seq_nr;
 482         }
 483 out:
 484         /* The session may be reset by one of the error handlers. */
 485         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 486         nfs41_sequence_free_slot(res);
 487         return 1;
 488 out_retry:
 489         if (!rpc_restart_call(task))
 490                 goto out;
 491         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 492         return 0;
 493 }
 494
 495 static int nfs4_sequence_done(struct rpc_task *task,
 496                                struct nfs4_sequence_res *res)
 497 {
 498         if (res->sr_session == NULL)
 499                 return 1;
 500         return nfs41_sequence_done(task, res);
 501 }
 502
 503 /*
 504  * nfs4_find_slot - efficiently look for a free slot
 505  *
 506  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 507  * If found, we mark the slot as used, update the highest_used_slotid,
 508  * and respectively set up the sequence operation args.
 509  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 510  *
 511  * Note: must be called with under the slot_tbl_lock.
 512  */
 513 static u8
 514 nfs4_find_slot(struct nfs4_slot_table *tbl)
 515 {
 516         int slotid;
 517         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 518         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 519
 520         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 521                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 522                 tbl->max_slots);
 523         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 524         if (slotid >= tbl->max_slots)
 525                 goto out;
 526         __set_bit(slotid, tbl->used_slots);
 527         if (slotid > tbl->highest_used_slotid)
 528                 tbl->highest_used_slotid = slotid;
 529         ret_id = slotid;
 530 out:
 531         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 532                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 533         return ret_id;
 534 }
 535
 536 int nfs41_setup_sequence(struct nfs4_session *session,
 537                                 struct nfs4_sequence_args *args,
 538                                 struct nfs4_sequence_res *res,
 539                                 int cache_reply,
 540                                 struct rpc_task *task)
 541 {
 542         struct nfs4_slot *slot;
 543         struct nfs4_slot_table *tbl;
 544         u8 slotid;
 545
 546         dprintk("--> %s\n", __func__);
 547         /* slot already allocated? */
 548         if (res->sr_slot != NULL)
 549                 return 0;
 550
 551         tbl = &session->fc_slot_table;
 552
 553         spin_lock(&tbl->slot_tbl_lock);
 554         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 555             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 556                 /*
 557                  * The state manager will wait until the slot table is empty.
 558                  * Schedule the reset thread
 559                  */
 560                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 561                 spin_unlock(&tbl->slot_tbl_lock);
 562                 dprintk("%s Schedule Session Reset\n", __func__);
 563                 return -EAGAIN;
 564         }
 565
 566         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 567             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 568                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 569                 spin_unlock(&tbl->slot_tbl_lock);
 570                 dprintk("%s enforce FIFO order\n", __func__);
 571                 return -EAGAIN;
 572         }
 573
 574         slotid = nfs4_find_slot(tbl);
 575         if (slotid == NFS4_MAX_SLOT_TABLE) {
 576                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 577                 spin_unlock(&tbl->slot_tbl_lock);
 578                 dprintk("<-- %s: no free slots\n", __func__);
 579                 return -EAGAIN;
 580         }
 581         spin_unlock(&tbl->slot_tbl_lock);
 582
 583         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 584         slot = tbl->slots + slotid;
 585         args->sa_session = session;
 586         args->sa_slotid = slotid;
 587         args->sa_cache_this = cache_reply;
 588
 589         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 590
 591         res->sr_session = session;
 592         res->sr_slot = slot;
 593         res->sr_renewal_time = jiffies;
 594         res->sr_status_flags = 0;
 595         /*
 596          * sr_status is only set in decode_sequence, and so will remain
 597          * set to 1 if an rpc level failure occurs.
 598          */
 599         res->sr_status = 1;
 600         return 0;
 601 }
 602 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 603
 604 int nfs4_setup_sequence(const struct nfs_server *server,
 605                         struct nfs4_sequence_args *args,
 606                         struct nfs4_sequence_res *res,
 607                         int cache_reply,
 608                         struct rpc_task *task)
 609 {
 610         struct nfs4_session *session = nfs4_get_session(server);
 611         int ret = 0;
 612
 613         if (session == NULL) {
 614                 args->sa_session = NULL;
 615                 res->sr_session = NULL;
 616                 goto out;
 617         }
 618
 619         dprintk("--> %s clp %p session %p sr_slot %td\n",
 620                 __func__, session->clp, session, res->sr_slot ?
 621                         res->sr_slot - session->fc_slot_table.slots : -1);
 622
 623         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 624                                    task);
 625 out:
 626         dprintk("<-- %s status=%d\n", __func__, ret);
 627         return ret;
 628 }
 629
 630 struct nfs41_call_sync_data {
 631         const struct nfs_server *seq_server;
 632         struct nfs4_sequence_args *seq_args;
 633         struct nfs4_sequence_res *seq_res;
 634         int cache_reply;
 635 };
 636
 637 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 638 {
 639         struct nfs41_call_sync_data *data = calldata;
 640
 641         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 642
 643         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 644                                 data->seq_res, data->cache_reply, task))
 645                 return;
 646         rpc_call_start(task);
 647 }
 648
 649 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 650 {
 651         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 652         nfs41_call_sync_prepare(task, calldata);
 653 }
 654
 655 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 656 {
 657         struct nfs41_call_sync_data *data = calldata;
 658
 659         nfs41_sequence_done(task, data->seq_res);
 660 }
 661
 662 struct rpc_call_ops nfs41_call_sync_ops = {
 663         .rpc_call_prepare = nfs41_call_sync_prepare,
 664         .rpc_call_done = nfs41_call_sync_done,
 665 };
 666
 667 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 668         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 669         .rpc_call_done = nfs41_call_sync_done,
 670 };
 671
 672 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 673                                    struct nfs_server *server,
 674                                    struct rpc_message *msg,
 675                                    struct nfs4_sequence_args *args,
 676                                    struct nfs4_sequence_res *res,
 677                                    int cache_reply,
 678                                    int privileged)
 679 {
 680         int ret;
 681         struct rpc_task *task;
 682         struct nfs41_call_sync_data data = {
 683                 .seq_server = server,
 684                 .seq_args = args,
 685                 .seq_res = res,
 686                 .cache_reply = cache_reply,
 687         };
 688         struct rpc_task_setup task_setup = {
 689                 .rpc_client = clnt,
 690                 .rpc_message = msg,
 691                 .callback_ops = &nfs41_call_sync_ops,
 692                 .callback_data = &data
 693         };
 694
 695         res->sr_slot = NULL;
 696         if (privileged)
 697                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 698         task = rpc_run_task(&task_setup);
 699         if (IS_ERR(task))
 700                 ret = PTR_ERR(task);
 701         else {
 702                 ret = task->tk_status;
 703                 rpc_put_task(task);
 704         }
 705         return ret;
 706 }
 707
 708 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 709                             struct nfs_server *server,
 710                             struct rpc_message *msg,
 711                             struct nfs4_sequence_args *args,
 712                             struct nfs4_sequence_res *res,
 713                             int cache_reply)
 714 {
 715         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 716 }
 717
 718 #else
 719 static int nfs4_sequence_done(struct rpc_task *task,
 720                                struct nfs4_sequence_res *res)
 721 {
 722         return 1;
 723 }
 724 #endif /* CONFIG_NFS_V4_1 */
 725
 726 int _nfs4_call_sync(struct rpc_clnt *clnt,
 727                     struct nfs_server *server,
 728                     struct rpc_message *msg,
 729                     struct nfs4_sequence_args *args,
 730                     struct nfs4_sequence_res *res,
 731                     int cache_reply)
 732 {
 733         args->sa_session = res->sr_session = NULL;
 734         return rpc_call_sync(clnt, msg, 0);
 735 }
 736
 737 static inline
 738 int nfs4_call_sync(struct rpc_clnt *clnt,
 739                    struct nfs_server *server,
 740                    struct rpc_message *msg,
 741                    struct nfs4_sequence_args *args,
 742                    struct nfs4_sequence_res *res,
 743                    int cache_reply)
 744 {
 745         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 746                                                 args, res, cache_reply);
 747 }
 748
 749 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 750 {
 751         struct nfs_inode *nfsi = NFS_I(dir);
 752
 753         spin_lock(&dir->i_lock);
 754         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 755         if (!cinfo->atomic || cinfo->before != dir->i_version)
 756                 nfs_force_lookup_revalidate(dir);
 757         dir->i_version = cinfo->after;
 758         spin_unlock(&dir->i_lock);
 759 }
 760
 761 struct nfs4_opendata {
 762         struct kref kref;
 763         struct nfs_openargs o_arg;
 764         struct nfs_openres o_res;
 765         struct nfs_open_confirmargs c_arg;
 766         struct nfs_open_confirmres c_res;
 767         struct nfs_fattr f_attr;
 768         struct nfs_fattr dir_attr;
 769         struct dentry *dir;
 770         struct dentry *dentry;
 771         struct nfs4_state_owner *owner;
 772         struct nfs4_state *state;
 773         struct iattr attrs;
 774         unsigned long timestamp;
 775         unsigned int rpc_done : 1;
 776         int rpc_status;
 777         int cancelled;
 778 };
 779
 780
 781 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 782 {
 783         p->o_res.f_attr = &p->f_attr;
 784         p->o_res.dir_attr = &p->dir_attr;
 785         p->o_res.seqid = p->o_arg.seqid;
 786         p->c_res.seqid = p->c_arg.seqid;
 787         p->o_res.server = p->o_arg.server;
 788         nfs_fattr_init(&p->f_attr);
 789         nfs_fattr_init(&p->dir_attr);
 790 }
 791
 792 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 793                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 794                 const struct iattr *attrs,
 795                 gfp_t gfp_mask)
 796 {
 797         struct dentry *parent = dget_parent(dentry);
 798         struct inode *dir = parent->d_inode;
 799         struct nfs_server *server = NFS_SERVER(dir);
 800         struct nfs4_opendata *p;
 801
 802         p = kzalloc(sizeof(*p), gfp_mask);
 803         if (p == NULL)
 804                 goto err;
 805         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 806         if (p->o_arg.seqid == NULL)
 807                 goto err_free;
 808         nfs_sb_active(dentry->d_sb);
 809         p->dentry = dget(dentry);
 810         p->dir = parent;
 811         p->owner = sp;
 812         atomic_inc(&sp->so_count);
 813         p->o_arg.fh = NFS_FH(dir);
 814         p->o_arg.open_flags = flags;
 815         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 816         p->o_arg.clientid = server->nfs_client->cl_clientid;
 817         p->o_arg.id = sp->so_owner_id.id;
 818         p->o_arg.name = &dentry->d_name;
 819         p->o_arg.server = server;
 820         p->o_arg.bitmask = server->attr_bitmask;
 821         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 822         if (flags & O_CREAT) {
 823                 u32 *s;
 824
 825                 p->o_arg.u.attrs = &p->attrs;
 826                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 827                 s = (u32 *) p->o_arg.u.verifier.data;
 828                 s[0] = jiffies;
 829                 s[1] = current->pid;
 830         }
 831         p->c_arg.fh = &p->o_res.fh;
 832         p->c_arg.stateid = &p->o_res.stateid;
 833         p->c_arg.seqid = p->o_arg.seqid;
 834         nfs4_init_opendata_res(p);
 835         kref_init(&p->kref);
 836         return p;
 837 err_free:
 838         kfree(p);
 839 err:
 840         dput(parent);
 841         return NULL;
 842 }
 843
 844 static void nfs4_opendata_free(struct kref *kref)
 845 {
 846         struct nfs4_opendata *p = container_of(kref,
 847                         struct nfs4_opendata, kref);
 848         struct super_block *sb = p->dentry->d_sb;
 849
 850         nfs_free_seqid(p->o_arg.seqid);
 851         if (p->state != NULL)
 852                 nfs4_put_open_state(p->state);
 853         nfs4_put_state_owner(p->owner);
 854         dput(p->dir);
 855         dput(p->dentry);
 856         nfs_sb_deactive(sb);
 857         kfree(p);
 858 }
 859
 860 static void nfs4_opendata_put(struct nfs4_opendata *p)
 861 {
 862         if (p != NULL)
 863                 kref_put(&p->kref, nfs4_opendata_free);
 864 }
 865
 866 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 867 {
 868         int ret;
 869
 870         ret = rpc_wait_for_completion_task(task);
 871         return ret;
 872 }
 873
 874 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 875 {
 876         int ret = 0;
 877
 878         if (open_mode & O_EXCL)
 879                 goto out;
 880         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 881                 case FMODE_READ:
 882                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 883                                 && state->n_rdonly != 0;
 884                         break;
 885                 case FMODE_WRITE:
 886                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 887                                 && state->n_wronly != 0;
 888                         break;
 889                 case FMODE_READ|FMODE_WRITE:
 890                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 891                                 && state->n_rdwr != 0;
 892         }
 893 out:
 894         return ret;
 895 }
 896
 897 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 898 {
 899         if (delegation == NULL)
 900                 return 0;
 901         if ((delegation->type & fmode) != fmode)
 902                 return 0;
 903         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 904                 return 0;
 905         nfs_mark_delegation_referenced(delegation);
 906         return 1;
 907 }
 908
 909 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 910 {
 911         switch (fmode) {
 912                 case FMODE_WRITE:
 913                         state->n_wronly++;
 914                         break;
 915                 case FMODE_READ:
 916                         state->n_rdonly++;
 917                         break;
 918                 case FMODE_READ|FMODE_WRITE:
 919                         state->n_rdwr++;
 920         }
 921         nfs4_state_set_mode_locked(state, state->state | fmode);
 922 }
 923
 924 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 925 {
 926         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 927                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 928         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 929         switch (fmode) {
 930                 case FMODE_READ:
 931                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 932                         break;
 933                 case FMODE_WRITE:
 934                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 935                         break;
 936                 case FMODE_READ|FMODE_WRITE:
 937                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 938         }
 939 }
 940
 941 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 942 {
 943         write_seqlock(&state->seqlock);
 944         nfs_set_open_stateid_locked(state, stateid, fmode);
 945         write_sequnlock(&state->seqlock);
 946 }
 947
 948 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 949 {
 950         /*
 951          * Protect the call to nfs4_state_set_mode_locked and
 952          * serialise the stateid update
 953          */
 954         write_seqlock(&state->seqlock);
 955         if (deleg_stateid != NULL) {
 956                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 957                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 958         }
 959         if (open_stateid != NULL)
 960                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 961         write_sequnlock(&state->seqlock);
 962         spin_lock(&state->owner->so_lock);
 963         update_open_stateflags(state, fmode);
 964         spin_unlock(&state->owner->so_lock);
 965 }
 966
 967 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 968 {
 969         struct nfs_inode *nfsi = NFS_I(state->inode);
 970         struct nfs_delegation *deleg_cur;
 971         int ret = 0;
 972
 973         fmode &= (FMODE_READ|FMODE_WRITE);
 974
 975         rcu_read_lock();
 976         deleg_cur = rcu_dereference(nfsi->delegation);
 977         if (deleg_cur == NULL)
 978                 goto no_delegation;
 979
 980         spin_lock(&deleg_cur->lock);
 981         if (nfsi->delegation != deleg_cur ||
 982             (deleg_cur->type & fmode) != fmode)
 983                 goto no_delegation_unlock;
 984
 985         if (delegation == NULL)
 986                 delegation = &deleg_cur->stateid;
 987         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 988                 goto no_delegation_unlock;
 989
 990         nfs_mark_delegation_referenced(deleg_cur);
 991         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 992         ret = 1;
 993 no_delegation_unlock:
 994         spin_unlock(&deleg_cur->lock);
 995 no_delegation:
 996         rcu_read_unlock();
 997
 998         if (!ret && open_stateid != NULL) {
 999                 __update_open_stateid(state, open_stateid, NULL, fmode);
1000                 ret = 1;
1001         }
1002
1003         return ret;
1004 }
1005
1006
1007 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1008 {
1009         struct nfs_delegation *delegation;
1010
1011         rcu_read_lock();
1012         delegation = rcu_dereference(NFS_I(inode)->delegation);
1013         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1014                 rcu_read_unlock();
1015                 return;
1016         }
1017         rcu_read_unlock();
1018         nfs_inode_return_delegation(inode);
1019 }
1020
1021 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1022 {
1023         struct nfs4_state *state = opendata->state;
1024         struct nfs_inode *nfsi = NFS_I(state->inode);
1025         struct nfs_delegation *delegation;
1026         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1027         fmode_t fmode = opendata->o_arg.fmode;
1028         nfs4_stateid stateid;
1029         int ret = -EAGAIN;
1030
1031         for (;;) {
1032                 if (can_open_cached(state, fmode, open_mode)) {
1033                         spin_lock(&state->owner->so_lock);
1034                         if (can_open_cached(state, fmode, open_mode)) {
1035                                 update_open_stateflags(state, fmode);
1036                                 spin_unlock(&state->owner->so_lock);
1037                                 goto out_return_state;
1038                         }
1039                         spin_unlock(&state->owner->so_lock);
1040                 }
1041                 rcu_read_lock();
1042                 delegation = rcu_dereference(nfsi->delegation);
1043                 if (!can_open_delegated(delegation, fmode)) {
1044                         rcu_read_unlock();
1045                         break;
1046                 }
1047                 /* Save the delegation */
1048                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1049                 rcu_read_unlock();
1050                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1051                 if (ret != 0)
1052                         goto out;
1053                 ret = -EAGAIN;
1054
1055                 /* Try to update the stateid using the delegation */
1056                 if (update_open_stateid(state, NULL, &stateid, fmode))
1057                         goto out_return_state;
1058         }
1059 out:
1060         return ERR_PTR(ret);
1061 out_return_state:
1062         atomic_inc(&state->count);
1063         return state;
1064 }
1065
1066 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1067 {
1068         struct inode *inode;
1069         struct nfs4_state *state = NULL;
1070         struct nfs_delegation *delegation;
1071         int ret;
1072
1073         if (!data->rpc_done) {
1074                 state = nfs4_try_open_cached(data);
1075                 goto out;
1076         }
1077
1078         ret = -EAGAIN;
1079         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1080                 goto err;
1081         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1082         ret = PTR_ERR(inode);
1083         if (IS_ERR(inode))
1084                 goto err;
1085         ret = -ENOMEM;
1086         state = nfs4_get_open_state(inode, data->owner);
1087         if (state == NULL)
1088                 goto err_put_inode;
1089         if (data->o_res.delegation_type != 0) {
1090                 int delegation_flags = 0;
1091
1092                 rcu_read_lock();
1093                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1094                 if (delegation)
1095                         delegation_flags = delegation->flags;
1096                 rcu_read_unlock();
1097                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1098                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1099                                         "returning a delegation for "
1100                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1101                                         NFS_CLIENT(inode)->cl_server);
1102                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1103                         nfs_inode_set_delegation(state->inode,
1104                                         data->owner->so_cred,
1105                                         &data->o_res);
1106                 else
1107                         nfs_inode_reclaim_delegation(state->inode,
1108                                         data->owner->so_cred,
1109                                         &data->o_res);
1110         }
1111
1112         update_open_stateid(state, &data->o_res.stateid, NULL,
1113                         data->o_arg.fmode);
1114         iput(inode);
1115 out:
1116         return state;
1117 err_put_inode:
1118         iput(inode);
1119 err:
1120         return ERR_PTR(ret);
1121 }
1122
1123 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1124 {
1125         struct nfs_inode *nfsi = NFS_I(state->inode);
1126         struct nfs_open_context *ctx;
1127
1128         spin_lock(&state->inode->i_lock);
1129         list_for_each_entry(ctx, &nfsi->open_files, list) {
1130                 if (ctx->state != state)
1131                         continue;
1132                 get_nfs_open_context(ctx);
1133                 spin_unlock(&state->inode->i_lock);
1134                 return ctx;
1135         }
1136         spin_unlock(&state->inode->i_lock);
1137         return ERR_PTR(-ENOENT);
1138 }
1139
1140 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1141 {
1142         struct nfs4_opendata *opendata;
1143
1144         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1145         if (opendata == NULL)
1146                 return ERR_PTR(-ENOMEM);
1147         opendata->state = state;
1148         atomic_inc(&state->count);
1149         return opendata;
1150 }
1151
1152 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1153 {
1154         struct nfs4_state *newstate;
1155         int ret;
1156
1157         opendata->o_arg.open_flags = 0;
1158         opendata->o_arg.fmode = fmode;
1159         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1160         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1161         nfs4_init_opendata_res(opendata);
1162         ret = _nfs4_recover_proc_open(opendata);
1163         if (ret != 0)
1164                 return ret;
1165         newstate = nfs4_opendata_to_nfs4_state(opendata);
1166         if (IS_ERR(newstate))
1167                 return PTR_ERR(newstate);
1168         nfs4_close_state(newstate, fmode);
1169         *res = newstate;
1170         return 0;
1171 }
1172
1173 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1174 {
1175         struct nfs4_state *newstate;
1176         int ret;
1177
1178         /* memory barrier prior to reading state->n_* */
1179         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1180         smp_rmb();
1181         if (state->n_rdwr != 0) {
1182                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1183                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1184                 if (ret != 0)
1185                         return ret;
1186                 if (newstate != state)
1187                         return -ESTALE;
1188         }
1189         if (state->n_wronly != 0) {
1190                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1191                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1192                 if (ret != 0)
1193                         return ret;
1194                 if (newstate != state)
1195                         return -ESTALE;
1196         }
1197         if (state->n_rdonly != 0) {
1198                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1199                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1200                 if (ret != 0)
1201                         return ret;
1202                 if (newstate != state)
1203                         return -ESTALE;
1204         }
1205         /*
1206          * We may have performed cached opens for all three recoveries.
1207          * Check if we need to update the current stateid.
1208          */
1209         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1210             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1211                 write_seqlock(&state->seqlock);
1212                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1213                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1214                 write_sequnlock(&state->seqlock);
1215         }
1216         return 0;
1217 }
1218
1219 /*
1220  * OPEN_RECLAIM:
1221  *      reclaim state on the server after a reboot.
1222  */
1223 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1224 {
1225         struct nfs_delegation *delegation;
1226         struct nfs4_opendata *opendata;
1227         fmode_t delegation_type = 0;
1228         int status;
1229
1230         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1231         if (IS_ERR(opendata))
1232                 return PTR_ERR(opendata);
1233         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1234         opendata->o_arg.fh = NFS_FH(state->inode);
1235         rcu_read_lock();
1236         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1237         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1238                 delegation_type = delegation->type;
1239         rcu_read_unlock();
1240         opendata->o_arg.u.delegation_type = delegation_type;
1241         status = nfs4_open_recover(opendata, state);
1242         nfs4_opendata_put(opendata);
1243         return status;
1244 }
1245
1246 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1247 {
1248         struct nfs_server *server = NFS_SERVER(state->inode);
1249         struct nfs4_exception exception = { };
1250         int err;
1251         do {
1252                 err = _nfs4_do_open_reclaim(ctx, state);
1253                 if (err != -NFS4ERR_DELAY)
1254                         break;
1255                 nfs4_handle_exception(server, err, &exception);
1256         } while (exception.retry);
1257         return err;
1258 }
1259
1260 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1261 {
1262         struct nfs_open_context *ctx;
1263         int ret;
1264
1265         ctx = nfs4_state_find_open_context(state);
1266         if (IS_ERR(ctx))
1267                 return PTR_ERR(ctx);
1268         ret = nfs4_do_open_reclaim(ctx, state);
1269         put_nfs_open_context(ctx);
1270         return ret;
1271 }
1272
1273 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1274 {
1275         struct nfs4_opendata *opendata;
1276         int ret;
1277
1278         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1279         if (IS_ERR(opendata))
1280                 return PTR_ERR(opendata);
1281         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1282         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1283                         sizeof(opendata->o_arg.u.delegation.data));
1284         ret = nfs4_open_recover(opendata, state);
1285         nfs4_opendata_put(opendata);
1286         return ret;
1287 }
1288
1289 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1290 {
1291         struct nfs4_exception exception = { };
1292         struct nfs_server *server = NFS_SERVER(state->inode);
1293         int err;
1294         do {
1295                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1296                 switch (err) {
1297                         case 0:
1298                         case -ENOENT:
1299                         case -ESTALE:
1300                                 goto out;
1301                         case -NFS4ERR_BADSESSION:
1302                         case -NFS4ERR_BADSLOT:
1303                         case -NFS4ERR_BAD_HIGH_SLOT:
1304                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1305                         case -NFS4ERR_DEADSESSION:
1306                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1307                                 goto out;
1308                         case -NFS4ERR_STALE_CLIENTID:
1309                         case -NFS4ERR_STALE_STATEID:
1310                         case -NFS4ERR_EXPIRED:
1311                                 /* Don't recall a delegation if it was lost */
1312                                 nfs4_schedule_lease_recovery(server->nfs_client);
1313                                 goto out;
1314                         case -ERESTARTSYS:
1315                                 /*
1316                                  * The show must go on: exit, but mark the
1317                                  * stateid as needing recovery.
1318                                  */
1319                         case -NFS4ERR_ADMIN_REVOKED:
1320                         case -NFS4ERR_BAD_STATEID:
1321                                 nfs4_schedule_stateid_recovery(server, state);
1322                         case -EKEYEXPIRED:
1323                                 /*
1324                                  * User RPCSEC_GSS context has expired.
1325                                  * We cannot recover this stateid now, so
1326                                  * skip it and allow recovery thread to
1327                                  * proceed.
1328                                  */
1329                         case -ENOMEM:
1330                                 err = 0;
1331                                 goto out;
1332                 }
1333                 err = nfs4_handle_exception(server, err, &exception);
1334         } while (exception.retry);
1335 out:
1336         return err;
1337 }
1338
1339 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1340 {
1341         struct nfs4_opendata *data = calldata;
1342
1343         data->rpc_status = task->tk_status;
1344         if (data->rpc_status == 0) {
1345                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1346                                 sizeof(data->o_res.stateid.data));
1347                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1348                 renew_lease(data->o_res.server, data->timestamp);
1349                 data->rpc_done = 1;
1350         }
1351 }
1352
1353 static void nfs4_open_confirm_release(void *calldata)
1354 {
1355         struct nfs4_opendata *data = calldata;
1356         struct nfs4_state *state = NULL;
1357
1358         /* If this request hasn't been cancelled, do nothing */
1359         if (data->cancelled == 0)
1360                 goto out_free;
1361         /* In case of error, no cleanup! */
1362         if (!data->rpc_done)
1363                 goto out_free;
1364         state = nfs4_opendata_to_nfs4_state(data);
1365         if (!IS_ERR(state))
1366                 nfs4_close_state(state, data->o_arg.fmode);
1367 out_free:
1368         nfs4_opendata_put(data);
1369 }
1370
1371 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1372         .rpc_call_done = nfs4_open_confirm_done,
1373         .rpc_release = nfs4_open_confirm_release,
1374 };
1375
1376 /*
1377  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1378  */
1379 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1380 {
1381         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1382         struct rpc_task *task;
1383         struct  rpc_message msg = {
1384                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1385                 .rpc_argp = &data->c_arg,
1386                 .rpc_resp = &data->c_res,
1387                 .rpc_cred = data->owner->so_cred,
1388         };
1389         struct rpc_task_setup task_setup_data = {
1390                 .rpc_client = server->client,
1391                 .rpc_message = &msg,
1392                 .callback_ops = &nfs4_open_confirm_ops,
1393                 .callback_data = data,
1394                 .workqueue = nfsiod_workqueue,
1395                 .flags = RPC_TASK_ASYNC,
1396         };
1397         int status;
1398
1399         kref_get(&data->kref);
1400         data->rpc_done = 0;
1401         data->rpc_status = 0;
1402         data->timestamp = jiffies;
1403         task = rpc_run_task(&task_setup_data);
1404         if (IS_ERR(task))
1405                 return PTR_ERR(task);
1406         status = nfs4_wait_for_completion_rpc_task(task);
1407         if (status != 0) {
1408                 data->cancelled = 1;
1409                 smp_wmb();
1410         } else
1411                 status = data->rpc_status;
1412         rpc_put_task(task);
1413         return status;
1414 }
1415
1416 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1417 {
1418         struct nfs4_opendata *data = calldata;
1419         struct nfs4_state_owner *sp = data->owner;
1420
1421         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1422                 return;
1423         /*
1424          * Check if we still need to send an OPEN call, or if we can use
1425          * a delegation instead.
1426          */
1427         if (data->state != NULL) {
1428                 struct nfs_delegation *delegation;
1429
1430                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1431                         goto out_no_action;
1432                 rcu_read_lock();
1433                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1434                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1435                     can_open_delegated(delegation, data->o_arg.fmode))
1436                         goto unlock_no_action;
1437                 rcu_read_unlock();
1438         }
1439         /* Update sequence id. */
1440         data->o_arg.id = sp->so_owner_id.id;
1441         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1442         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1443                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1444                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1445         }
1446         data->timestamp = jiffies;
1447         if (nfs4_setup_sequence(data->o_arg.server,
1448                                 &data->o_arg.seq_args,
1449                                 &data->o_res.seq_res, 1, task))
1450                 return;
1451         rpc_call_start(task);
1452         return;
1453 unlock_no_action:
1454         rcu_read_unlock();
1455 out_no_action:
1456         task->tk_action = NULL;
1457
1458 }
1459
1460 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1461 {
1462         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1463         nfs4_open_prepare(task, calldata);
1464 }
1465
1466 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1467 {
1468         struct nfs4_opendata *data = calldata;
1469
1470         data->rpc_status = task->tk_status;
1471
1472         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1473                 return;
1474
1475         if (task->tk_status == 0) {
1476                 switch (data->o_res.f_attr->mode & S_IFMT) {
1477                         case S_IFREG:
1478                                 break;
1479                         case S_IFLNK:
1480                                 data->rpc_status = -ELOOP;
1481                                 break;
1482                         case S_IFDIR:
1483                                 data->rpc_status = -EISDIR;
1484                                 break;
1485                         default:
1486                                 data->rpc_status = -ENOTDIR;
1487                 }
1488                 renew_lease(data->o_res.server, data->timestamp);
1489                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1490                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1491         }
1492         data->rpc_done = 1;
1493 }
1494
1495 static void nfs4_open_release(void *calldata)
1496 {
1497         struct nfs4_opendata *data = calldata;
1498         struct nfs4_state *state = NULL;
1499
1500         /* If this request hasn't been cancelled, do nothing */
1501         if (data->cancelled == 0)
1502                 goto out_free;
1503         /* In case of error, no cleanup! */
1504         if (data->rpc_status != 0 || !data->rpc_done)
1505                 goto out_free;
1506         /* In case we need an open_confirm, no cleanup! */
1507         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1508                 goto out_free;
1509         state = nfs4_opendata_to_nfs4_state(data);
1510         if (!IS_ERR(state))
1511                 nfs4_close_state(state, data->o_arg.fmode);
1512 out_free:
1513         nfs4_opendata_put(data);
1514 }
1515
1516 static const struct rpc_call_ops nfs4_open_ops = {
1517         .rpc_call_prepare = nfs4_open_prepare,
1518         .rpc_call_done = nfs4_open_done,
1519         .rpc_release = nfs4_open_release,
1520 };
1521
1522 static const struct rpc_call_ops nfs4_recover_open_ops = {
1523         .rpc_call_prepare = nfs4_recover_open_prepare,
1524         .rpc_call_done = nfs4_open_done,
1525         .rpc_release = nfs4_open_release,
1526 };
1527
1528 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1529 {
1530         struct inode *dir = data->dir->d_inode;
1531         struct nfs_server *server = NFS_SERVER(dir);
1532         struct nfs_openargs *o_arg = &data->o_arg;
1533         struct nfs_openres *o_res = &data->o_res;
1534         struct rpc_task *task;
1535         struct rpc_message msg = {
1536                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1537                 .rpc_argp = o_arg,
1538                 .rpc_resp = o_res,
1539                 .rpc_cred = data->owner->so_cred,
1540         };
1541         struct rpc_task_setup task_setup_data = {
1542                 .rpc_client = server->client,
1543                 .rpc_message = &msg,
1544                 .callback_ops = &nfs4_open_ops,
1545                 .callback_data = data,
1546                 .workqueue = nfsiod_workqueue,
1547                 .flags = RPC_TASK_ASYNC,
1548         };
1549         int status;
1550
1551         kref_get(&data->kref);
1552         data->rpc_done = 0;
1553         data->rpc_status = 0;
1554         data->cancelled = 0;
1555         if (isrecover)
1556                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1557         task = rpc_run_task(&task_setup_data);
1558         if (IS_ERR(task))
1559                 return PTR_ERR(task);
1560         status = nfs4_wait_for_completion_rpc_task(task);
1561         if (status != 0) {
1562                 data->cancelled = 1;
1563                 smp_wmb();
1564         } else
1565                 status = data->rpc_status;
1566         rpc_put_task(task);
1567
1568         return status;
1569 }
1570
1571 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1572 {
1573         struct inode *dir = data->dir->d_inode;
1574         struct nfs_openres *o_res = &data->o_res;
1575         int status;
1576
1577         status = nfs4_run_open_task(data, 1);
1578         if (status != 0 || !data->rpc_done)
1579                 return status;
1580
1581         nfs_refresh_inode(dir, o_res->dir_attr);
1582
1583         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1584                 status = _nfs4_proc_open_confirm(data);
1585                 if (status != 0)
1586                         return status;
1587         }
1588
1589         return status;
1590 }
1591
1592 /*
1593  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1594  */
1595 static int _nfs4_proc_open(struct nfs4_opendata *data)
1596 {
1597         struct inode *dir = data->dir->d_inode;
1598         struct nfs_server *server = NFS_SERVER(dir);
1599         struct nfs_openargs *o_arg = &data->o_arg;
1600         struct nfs_openres *o_res = &data->o_res;
1601         int status;
1602
1603         status = nfs4_run_open_task(data, 0);
1604         if (!data->rpc_done)
1605                 return status;
1606         if (status != 0) {
1607                 if (status == -NFS4ERR_BADNAME &&
1608                                 !(o_arg->open_flags & O_CREAT))
1609                         return -ENOENT;
1610                 return status;
1611         }
1612
1613         if (o_arg->open_flags & O_CREAT) {
1614                 update_changeattr(dir, &o_res->cinfo);
1615                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1616         } else
1617                 nfs_refresh_inode(dir, o_res->dir_attr);
1618         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1619                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1620         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1621                 status = _nfs4_proc_open_confirm(data);
1622                 if (status != 0)
1623                         return status;
1624         }
1625         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1626                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1627         return 0;
1628 }
1629
1630 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1631 {
1632         unsigned int loop;
1633         int ret;
1634
1635         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1636                 ret = nfs4_wait_clnt_recover(clp);
1637                 if (ret != 0)
1638                         break;
1639                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1640                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1641                         break;
1642                 nfs4_schedule_state_manager(clp);
1643                 ret = -EIO;
1644         }
1645         return ret;
1646 }
1647
1648 static int nfs4_recover_expired_lease(struct nfs_server *server)
1649 {
1650         return nfs4_client_recover_expired_lease(server->nfs_client);
1651 }
1652
1653 /*
1654  * OPEN_EXPIRED:
1655  *      reclaim state on the server after a network partition.
1656  *      Assumes caller holds the appropriate lock
1657  */
1658 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1659 {
1660         struct nfs4_opendata *opendata;
1661         int ret;
1662
1663         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1664         if (IS_ERR(opendata))
1665                 return PTR_ERR(opendata);
1666         ret = nfs4_open_recover(opendata, state);
1667         if (ret == -ESTALE)
1668                 d_drop(ctx->dentry);
1669         nfs4_opendata_put(opendata);
1670         return ret;
1671 }
1672
1673 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1674 {
1675         struct nfs_server *server = NFS_SERVER(state->inode);
1676         struct nfs4_exception exception = { };
1677         int err;
1678
1679         do {
1680                 err = _nfs4_open_expired(ctx, state);
1681                 switch (err) {
1682                 default:
1683                         goto out;
1684                 case -NFS4ERR_GRACE:
1685                 case -NFS4ERR_DELAY:
1686                         nfs4_handle_exception(server, err, &exception);
1687                         err = 0;
1688                 }
1689         } while (exception.retry);
1690 out:
1691         return err;
1692 }
1693
1694 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1695 {
1696         struct nfs_open_context *ctx;
1697         int ret;
1698
1699         ctx = nfs4_state_find_open_context(state);
1700         if (IS_ERR(ctx))
1701                 return PTR_ERR(ctx);
1702         ret = nfs4_do_open_expired(ctx, state);
1703         put_nfs_open_context(ctx);
1704         return ret;
1705 }
1706
1707 #if defined(CONFIG_NFS_V4_1)
1708 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1709 {
1710         int status;
1711         struct nfs_server *server = NFS_SERVER(state->inode);
1712
1713         status = nfs41_test_stateid(server, state);
1714         if (status == NFS_OK)
1715                 return 0;
1716         nfs41_free_stateid(server, state);
1717         return nfs4_open_expired(sp, state);
1718 }
1719 #endif
1720
1721 /*
1722  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1723  * fields corresponding to attributes that were used to store the verifier.
1724  * Make sure we clobber those fields in the later setattr call
1725  */
1726 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1727 {
1728         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1729             !(sattr->ia_valid & ATTR_ATIME_SET))
1730                 sattr->ia_valid |= ATTR_ATIME;
1731
1732         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1733             !(sattr->ia_valid & ATTR_MTIME_SET))
1734                 sattr->ia_valid |= ATTR_MTIME;
1735 }
1736
1737 /*
1738  * Returns a referenced nfs4_state
1739  */
1740 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1741 {
1742         struct nfs4_state_owner  *sp;
1743         struct nfs4_state     *state = NULL;
1744         struct nfs_server       *server = NFS_SERVER(dir);
1745         struct nfs4_opendata *opendata;
1746         int status;
1747
1748         /* Protect against reboot recovery conflicts */
1749         status = -ENOMEM;
1750         if (!(sp = nfs4_get_state_owner(server, cred))) {
1751                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1752                 goto out_err;
1753         }
1754         status = nfs4_recover_expired_lease(server);
1755         if (status != 0)
1756                 goto err_put_state_owner;
1757         if (dentry->d_inode != NULL)
1758                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1759         status = -ENOMEM;
1760         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1761         if (opendata == NULL)
1762                 goto err_put_state_owner;
1763
1764         if (dentry->d_inode != NULL)
1765                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1766
1767         status = _nfs4_proc_open(opendata);
1768         if (status != 0)
1769                 goto err_opendata_put;
1770
1771         state = nfs4_opendata_to_nfs4_state(opendata);
1772         status = PTR_ERR(state);
1773         if (IS_ERR(state))
1774                 goto err_opendata_put;
1775         if (server->caps & NFS_CAP_POSIX_LOCK)
1776                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1777
1778         if (opendata->o_arg.open_flags & O_EXCL) {
1779                 nfs4_exclusive_attrset(opendata, sattr);
1780
1781                 nfs_fattr_init(opendata->o_res.f_attr);
1782                 status = nfs4_do_setattr(state->inode, cred,
1783                                 opendata->o_res.f_attr, sattr,
1784                                 state);
1785                 if (status == 0)
1786                         nfs_setattr_update_inode(state->inode, sattr);
1787                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1788         }
1789         nfs4_opendata_put(opendata);
1790         nfs4_put_state_owner(sp);
1791         *res = state;
1792         return 0;
1793 err_opendata_put:
1794         nfs4_opendata_put(opendata);
1795 err_put_state_owner:
1796         nfs4_put_state_owner(sp);
1797 out_err:
1798         *res = NULL;
1799         return status;
1800 }
1801
1802
1803 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1804 {
1805         struct nfs4_exception exception = { };
1806         struct nfs4_state *res;
1807         int status;
1808
1809         do {
1810                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1811                 if (status == 0)
1812                         break;
1813                 /* NOTE: BAD_SEQID means the server and client disagree about the
1814                  * book-keeping w.r.t. state-changing operations
1815                  * (OPEN/CLOSE/LOCK/LOCKU...)
1816                  * It is actually a sign of a bug on the client or on the server.
1817                  *
1818                  * If we receive a BAD_SEQID error in the particular case of
1819                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1820                  * have unhashed the old state_owner for us, and that we can
1821                  * therefore safely retry using a new one. We should still warn
1822                  * the user though...
1823                  */
1824                 if (status == -NFS4ERR_BAD_SEQID) {
1825                         printk(KERN_WARNING "NFS: v4 server %s "
1826                                         " returned a bad sequence-id error!\n",
1827                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1828                         exception.retry = 1;
1829                         continue;
1830                 }
1831                 /*
1832                  * BAD_STATEID on OPEN means that the server cancelled our
1833                  * state before it received the OPEN_CONFIRM.
1834                  * Recover by retrying the request as per the discussion
1835                  * on Page 181 of RFC3530.
1836                  */
1837                 if (status == -NFS4ERR_BAD_STATEID) {
1838                         exception.retry = 1;
1839                         continue;
1840                 }
1841                 if (status == -EAGAIN) {
1842                         /* We must have found a delegation */
1843                         exception.retry = 1;
1844                         continue;
1845                 }
1846                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1847                                         status, &exception));
1848         } while (exception.retry);
1849         return res;
1850 }
1851
1852 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1853                             struct nfs_fattr *fattr, struct iattr *sattr,
1854                             struct nfs4_state *state)
1855 {
1856         struct nfs_server *server = NFS_SERVER(inode);
1857         struct nfs_setattrargs  arg = {
1858                 .fh             = NFS_FH(inode),
1859                 .iap            = sattr,
1860                 .server         = server,
1861                 .bitmask = server->attr_bitmask,
1862         };
1863         struct nfs_setattrres  res = {
1864                 .fattr          = fattr,
1865                 .server         = server,
1866         };
1867         struct rpc_message msg = {
1868                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1869                 .rpc_argp       = &arg,
1870                 .rpc_resp       = &res,
1871                 .rpc_cred       = cred,
1872         };
1873         unsigned long timestamp = jiffies;
1874         int status;
1875
1876         nfs_fattr_init(fattr);
1877
1878         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1879                 /* Use that stateid */
1880         } else if (state != NULL) {
1881                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1882         } else
1883                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1884
1885         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1886         if (status == 0 && state != NULL)
1887                 renew_lease(server, timestamp);
1888         return status;
1889 }
1890
1891 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1892                            struct nfs_fattr *fattr, struct iattr *sattr,
1893                            struct nfs4_state *state)
1894 {
1895         struct nfs_server *server = NFS_SERVER(inode);
1896         struct nfs4_exception exception = { };
1897         int err;
1898         do {
1899                 err = nfs4_handle_exception(server,
1900                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1901                                 &exception);
1902         } while (exception.retry);
1903         return err;
1904 }
1905
1906 struct nfs4_closedata {
1907         struct inode *inode;
1908         struct nfs4_state *state;
1909         struct nfs_closeargs arg;
1910         struct nfs_closeres res;
1911         struct nfs_fattr fattr;
1912         unsigned long timestamp;
1913         bool roc;
1914         u32 roc_barrier;
1915 };
1916
1917 static void nfs4_free_closedata(void *data)
1918 {
1919         struct nfs4_closedata *calldata = data;
1920         struct nfs4_state_owner *sp = calldata->state->owner;
1921         struct super_block *sb = calldata->state->inode->i_sb;
1922
1923         if (calldata->roc)
1924                 pnfs_roc_release(calldata->state->inode);
1925         nfs4_put_open_state(calldata->state);
1926         nfs_free_seqid(calldata->arg.seqid);
1927         nfs4_put_state_owner(sp);
1928         nfs_sb_deactive(sb);
1929         kfree(calldata);
1930 }
1931
1932 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1933                 fmode_t fmode)
1934 {
1935         spin_lock(&state->owner->so_lock);
1936         if (!(fmode & FMODE_READ))
1937                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1938         if (!(fmode & FMODE_WRITE))
1939                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1940         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1941         spin_unlock(&state->owner->so_lock);
1942 }
1943
1944 static void nfs4_close_done(struct rpc_task *task, void *data)
1945 {
1946         struct nfs4_closedata *calldata = data;
1947         struct nfs4_state *state = calldata->state;
1948         struct nfs_server *server = NFS_SERVER(calldata->inode);
1949
1950         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1951                 return;
1952         /* hmm. we are done with the inode, and in the process of freeing
1953          * the state_owner. we keep this around to process errors
1954          */
1955         switch (task->tk_status) {
1956                 case 0:
1957                         if (calldata->roc)
1958                                 pnfs_roc_set_barrier(state->inode,
1959                                                      calldata->roc_barrier);
1960                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1961                         renew_lease(server, calldata->timestamp);
1962                         nfs4_close_clear_stateid_flags(state,
1963                                         calldata->arg.fmode);
1964                         break;
1965                 case -NFS4ERR_STALE_STATEID:
1966                 case -NFS4ERR_OLD_STATEID:
1967                 case -NFS4ERR_BAD_STATEID:
1968                 case -NFS4ERR_EXPIRED:
1969                         if (calldata->arg.fmode == 0)
1970                                 break;
1971                 default:
1972                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1973                                 rpc_restart_call_prepare(task);
1974         }
1975         nfs_release_seqid(calldata->arg.seqid);
1976         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1977 }
1978
1979 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1980 {
1981         struct nfs4_closedata *calldata = data;
1982         struct nfs4_state *state = calldata->state;
1983         int call_close = 0;
1984
1985         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1986                 return;
1987
1988         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1989         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1990         spin_lock(&state->owner->so_lock);
1991         /* Calculate the change in open mode */
1992         if (state->n_rdwr == 0) {
1993                 if (state->n_rdonly == 0) {
1994                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1995                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1996                         calldata->arg.fmode &= ~FMODE_READ;
1997                 }
1998                 if (state->n_wronly == 0) {
1999                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2000                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2001                         calldata->arg.fmode &= ~FMODE_WRITE;
2002                 }
2003         }
2004         spin_unlock(&state->owner->so_lock);
2005
2006         if (!call_close) {
2007                 /* Note: exit _without_ calling nfs4_close_done */
2008                 task->tk_action = NULL;
2009                 return;
2010         }
2011
2012         if (calldata->arg.fmode == 0) {
2013                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2014                 if (calldata->roc &&
2015                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2016                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2017                                      task, NULL);
2018                         return;
2019                 }
2020         }
2021
2022         nfs_fattr_init(calldata->res.fattr);
2023         calldata->timestamp = jiffies;
2024         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2025                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2026                                 1, task))
2027                 return;
2028         rpc_call_start(task);
2029 }
2030
2031 static const struct rpc_call_ops nfs4_close_ops = {
2032         .rpc_call_prepare = nfs4_close_prepare,
2033         .rpc_call_done = nfs4_close_done,
2034         .rpc_release = nfs4_free_closedata,
2035 };
2036
2037 /*
2038  * It is possible for data to be read/written from a mem-mapped file
2039  * after the sys_close call (which hits the vfs layer as a flush).
2040  * This means that we can't safely call nfsv4 close on a file until
2041  * the inode is cleared. This in turn means that we are not good
2042  * NFSv4 citizens - we do not indicate to the server to update the file's
2043  * share state even when we are done with one of the three share
2044  * stateid's in the inode.
2045  *
2046  * NOTE: Caller must be holding the sp->so_owner semaphore!
2047  */
2048 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2049 {
2050         struct nfs_server *server = NFS_SERVER(state->inode);
2051         struct nfs4_closedata *calldata;
2052         struct nfs4_state_owner *sp = state->owner;
2053         struct rpc_task *task;
2054         struct rpc_message msg = {
2055                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2056                 .rpc_cred = state->owner->so_cred,
2057         };
2058         struct rpc_task_setup task_setup_data = {
2059                 .rpc_client = server->client,
2060                 .rpc_message = &msg,
2061                 .callback_ops = &nfs4_close_ops,
2062                 .workqueue = nfsiod_workqueue,
2063                 .flags = RPC_TASK_ASYNC,
2064         };
2065         int status = -ENOMEM;
2066
2067         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2068         if (calldata == NULL)
2069                 goto out;
2070         calldata->inode = state->inode;
2071         calldata->state = state;
2072         calldata->arg.fh = NFS_FH(state->inode);
2073         calldata->arg.stateid = &state->open_stateid;
2074         /* Serialization for the sequence id */
2075         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2076         if (calldata->arg.seqid == NULL)
2077                 goto out_free_calldata;
2078         calldata->arg.fmode = 0;
2079         calldata->arg.bitmask = server->cache_consistency_bitmask;
2080         calldata->res.fattr = &calldata->fattr;
2081         calldata->res.seqid = calldata->arg.seqid;
2082         calldata->res.server = server;
2083         calldata->roc = roc;
2084         nfs_sb_active(calldata->inode->i_sb);
2085
2086         msg.rpc_argp = &calldata->arg;
2087         msg.rpc_resp = &calldata->res;
2088         task_setup_data.callback_data = calldata;
2089         task = rpc_run_task(&task_setup_data);
2090         if (IS_ERR(task))
2091                 return PTR_ERR(task);
2092         status = 0;
2093         if (wait)
2094                 status = rpc_wait_for_completion_task(task);
2095         rpc_put_task(task);
2096         return status;
2097 out_free_calldata:
2098         kfree(calldata);
2099 out:
2100         if (roc)
2101                 pnfs_roc_release(state->inode);
2102         nfs4_put_open_state(state);
2103         nfs4_put_state_owner(sp);
2104         return status;
2105 }
2106
2107 static struct inode *
2108 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2109 {
2110         struct nfs4_state *state;
2111
2112         /* Protect against concurrent sillydeletes */
2113         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2114         if (IS_ERR(state))
2115                 return ERR_CAST(state);
2116         ctx->state = state;
2117         return igrab(state->inode);
2118 }
2119
2120 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2121 {
2122         if (ctx->state == NULL)
2123                 return;
2124         if (is_sync)
2125                 nfs4_close_sync(ctx->state, ctx->mode);
2126         else
2127                 nfs4_close_state(ctx->state, ctx->mode);
2128 }
2129
2130 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2131 {
2132         struct nfs4_server_caps_arg args = {
2133                 .fhandle = fhandle,
2134         };
2135         struct nfs4_server_caps_res res = {};
2136         struct rpc_message msg = {
2137                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2138                 .rpc_argp = &args,
2139                 .rpc_resp = &res,
2140         };
2141         int status;
2142
2143         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2144         if (status == 0) {
2145                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2146                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2147                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2148                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2149                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2150                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2151                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2152                         server->caps |= NFS_CAP_ACLS;
2153                 if (res.has_links != 0)
2154                         server->caps |= NFS_CAP_HARDLINKS;
2155                 if (res.has_symlinks != 0)
2156                         server->caps |= NFS_CAP_SYMLINKS;
2157                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2158                         server->caps |= NFS_CAP_FILEID;
2159                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2160                         server->caps |= NFS_CAP_MODE;
2161                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2162                         server->caps |= NFS_CAP_NLINK;
2163                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2164                         server->caps |= NFS_CAP_OWNER;
2165                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2166                         server->caps |= NFS_CAP_OWNER_GROUP;
2167                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2168                         server->caps |= NFS_CAP_ATIME;
2169                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2170                         server->caps |= NFS_CAP_CTIME;
2171                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2172                         server->caps |= NFS_CAP_MTIME;
2173
2174                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2175                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2176                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2177                 server->acl_bitmask = res.acl_bitmask;
2178         }
2179
2180         return status;
2181 }
2182
2183 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2184 {
2185         struct nfs4_exception exception = { };
2186         int err;
2187         do {
2188                 err = nfs4_handle_exception(server,
2189                                 _nfs4_server_capabilities(server, fhandle),
2190                                 &exception);
2191         } while (exception.retry);
2192         return err;
2193 }
2194
2195 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2196                 struct nfs_fsinfo *info)
2197 {
2198         struct nfs4_lookup_root_arg args = {
2199                 .bitmask = nfs4_fattr_bitmap,
2200         };
2201         struct nfs4_lookup_res res = {
2202                 .server = server,
2203                 .fattr = info->fattr,
2204                 .fh = fhandle,
2205         };
2206         struct rpc_message msg = {
2207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2208                 .rpc_argp = &args,
2209                 .rpc_resp = &res,
2210         };
2211
2212         nfs_fattr_init(info->fattr);
2213         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2214 }
2215
2216 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2217                 struct nfs_fsinfo *info)
2218 {
2219         struct nfs4_exception exception = { };
2220         int err;
2221         do {
2222                 err = _nfs4_lookup_root(server, fhandle, info);
2223                 switch (err) {
2224                 case 0:
2225                 case -NFS4ERR_WRONGSEC:
2226                         break;
2227                 default:
2228                         err = nfs4_handle_exception(server, err, &exception);
2229                 }
2230         } while (exception.retry);
2231         return err;
2232 }
2233
2234 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2235                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2236 {
2237         struct rpc_auth *auth;
2238         int ret;
2239
2240         auth = rpcauth_create(flavor, server->client);
2241         if (!auth) {
2242                 ret = -EIO;
2243                 goto out;
2244         }
2245         ret = nfs4_lookup_root(server, fhandle, info);
2246 out:
2247         return ret;
2248 }
2249
2250 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2251                               struct nfs_fsinfo *info)
2252 {
2253         int i, len, status = 0;
2254         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2255
2256         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2257         flav_array[len] = RPC_AUTH_NULL;
2258         len += 1;
2259
2260         for (i = 0; i < len; i++) {
2261                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2262                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2263                         continue;
2264                 break;
2265         }
2266         /*
2267          * -EACCESS could mean that the user doesn't have correct permissions
2268          * to access the mount.  It could also mean that we tried to mount
2269          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2270          * existing mount programs don't handle -EACCES very well so it should
2271          * be mapped to -EPERM instead.
2272          */
2273         if (status == -EACCES)
2274                 status = -EPERM;
2275         return status;
2276 }
2277
2278 /*
2279  * get the file handle for the "/" directory on the server
2280  */
2281 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2282                               struct nfs_fsinfo *info)
2283 {
2284         int minor_version = server->nfs_client->cl_minorversion;
2285         int status = nfs4_lookup_root(server, fhandle, info);
2286         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2287                 /*
2288                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2289                  * by nfs4_map_errors() as this function exits.
2290                  */
2291                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2292         if (status == 0)
2293                 status = nfs4_server_capabilities(server, fhandle);
2294         if (status == 0)
2295                 status = nfs4_do_fsinfo(server, fhandle, info);
2296         return nfs4_map_errors(status);
2297 }
2298
2299 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2300 /*
2301  * Get locations and (maybe) other attributes of a referral.
2302  * Note that we'll actually follow the referral later when
2303  * we detect fsid mismatch in inode revalidation
2304  */
2305 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2306                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2307 {
2308         int status = -ENOMEM;
2309         struct page *page = NULL;
2310         struct nfs4_fs_locations *locations = NULL;
2311
2312         page = alloc_page(GFP_KERNEL);
2313         if (page == NULL)
2314                 goto out;
2315         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2316         if (locations == NULL)
2317                 goto out;
2318
2319         status = nfs4_proc_fs_locations(dir, name, locations, page);
2320         if (status != 0)
2321                 goto out;
2322         /* Make sure server returned a different fsid for the referral */
2323         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2324                 dprintk("%s: server did not return a different fsid for"
2325                         " a referral at %s\n", __func__, name->name);
2326                 status = -EIO;
2327                 goto out;
2328         }
2329         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2330         nfs_fixup_referral_attributes(&locations->fattr);
2331
2332         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2333         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2334         memset(fhandle, 0, sizeof(struct nfs_fh));
2335 out:
2336         if (page)
2337                 __free_page(page);
2338         kfree(locations);
2339         return status;
2340 }
2341
2342 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2343 {
2344         struct nfs4_getattr_arg args = {
2345                 .fh = fhandle,
2346                 .bitmask = server->attr_bitmask,
2347         };
2348         struct nfs4_getattr_res res = {
2349                 .fattr = fattr,
2350                 .server = server,
2351         };
2352         struct rpc_message msg = {
2353                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2354                 .rpc_argp = &args,
2355                 .rpc_resp = &res,
2356         };
2357
2358         nfs_fattr_init(fattr);
2359         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2360 }
2361
2362 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2363 {
2364         struct nfs4_exception exception = { };
2365         int err;
2366         do {
2367                 err = nfs4_handle_exception(server,
2368                                 _nfs4_proc_getattr(server, fhandle, fattr),
2369                                 &exception);
2370         } while (exception.retry);
2371         return err;
2372 }
2373
2374 /*
2375  * The file is not closed if it is opened due to the a request to change
2376  * the size of the file. The open call will not be needed once the
2377  * VFS layer lookup-intents are implemented.
2378  *
2379  * Close is called when the inode is destroyed.
2380  * If we haven't opened the file for O_WRONLY, we
2381  * need to in the size_change case to obtain a stateid.
2382  *
2383  * Got race?
2384  * Because OPEN is always done by name in nfsv4, it is
2385  * possible that we opened a different file by the same
2386  * name.  We can recognize this race condition, but we
2387  * can't do anything about it besides returning an error.
2388  *
2389  * This will be fixed with VFS changes (lookup-intent).
2390  */
2391 static int
2392 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2393                   struct iattr *sattr)
2394 {
2395         struct inode *inode = dentry->d_inode;
2396         struct rpc_cred *cred = NULL;
2397         struct nfs4_state *state = NULL;
2398         int status;
2399
2400         if (pnfs_ld_layoutret_on_setattr(inode))
2401                 pnfs_return_layout(inode);
2402
2403         nfs_fattr_init(fattr);
2404
2405         /* Search for an existing open(O_WRITE) file */
2406         if (sattr->ia_valid & ATTR_FILE) {
2407                 struct nfs_open_context *ctx;
2408
2409                 ctx = nfs_file_open_context(sattr->ia_file);
2410                 if (ctx) {
2411                         cred = ctx->cred;
2412                         state = ctx->state;
2413                 }
2414         }
2415
2416         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2417         if (status == 0)
2418                 nfs_setattr_update_inode(inode, sattr);
2419         return status;
2420 }
2421
2422 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2423                 const struct qstr *name, struct nfs_fh *fhandle,
2424                 struct nfs_fattr *fattr)
2425 {
2426         struct nfs_server *server = NFS_SERVER(dir);
2427         int                    status;
2428         struct nfs4_lookup_arg args = {
2429                 .bitmask = server->attr_bitmask,
2430                 .dir_fh = NFS_FH(dir),
2431                 .name = name,
2432         };
2433         struct nfs4_lookup_res res = {
2434                 .server = server,
2435                 .fattr = fattr,
2436                 .fh = fhandle,
2437         };
2438         struct rpc_message msg = {
2439                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2440                 .rpc_argp = &args,
2441                 .rpc_resp = &res,
2442         };
2443
2444         nfs_fattr_init(fattr);
2445
2446         dprintk("NFS call  lookup %s\n", name->name);
2447         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2448         dprintk("NFS reply lookup: %d\n", status);
2449         return status;
2450 }
2451
2452 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2453 {
2454         memset(fh, 0, sizeof(struct nfs_fh));
2455         fattr->fsid.major = 1;
2456         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2457                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2458         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2459         fattr->nlink = 2;
2460 }
2461
2462 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2463                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2464 {
2465         struct nfs4_exception exception = { };
2466         int err;
2467         do {
2468                 int status;
2469
2470                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2471                 switch (status) {
2472                 case -NFS4ERR_BADNAME:
2473                         return -ENOENT;
2474                 case -NFS4ERR_MOVED:
2475                         return nfs4_get_referral(dir, name, fattr, fhandle);
2476                 case -NFS4ERR_WRONGSEC:
2477                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2478                 }
2479                 err = nfs4_handle_exception(NFS_SERVER(dir),
2480                                 status, &exception);
2481         } while (exception.retry);
2482         return err;
2483 }
2484
2485 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2486 {
2487         struct nfs_server *server = NFS_SERVER(inode);
2488         struct nfs4_accessargs args = {
2489                 .fh = NFS_FH(inode),
2490                 .bitmask = server->attr_bitmask,
2491         };
2492         struct nfs4_accessres res = {
2493                 .server = server,
2494         };
2495         struct rpc_message msg = {
2496                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2497                 .rpc_argp = &args,
2498                 .rpc_resp = &res,
2499                 .rpc_cred = entry->cred,
2500         };
2501         int mode = entry->mask;
2502         int status;
2503
2504         /*
2505          * Determine which access bits we want to ask for...
2506          */
2507         if (mode & MAY_READ)
2508                 args.access |= NFS4_ACCESS_READ;
2509         if (S_ISDIR(inode->i_mode)) {
2510                 if (mode & MAY_WRITE)
2511                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2512                 if (mode & MAY_EXEC)
2513                         args.access |= NFS4_ACCESS_LOOKUP;
2514         } else {
2515                 if (mode & MAY_WRITE)
2516                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2517                 if (mode & MAY_EXEC)
2518                         args.access |= NFS4_ACCESS_EXECUTE;
2519         }
2520
2521         res.fattr = nfs_alloc_fattr();
2522         if (res.fattr == NULL)
2523                 return -ENOMEM;
2524
2525         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2526         if (!status) {
2527                 entry->mask = 0;
2528                 if (res.access & NFS4_ACCESS_READ)
2529                         entry->mask |= MAY_READ;
2530                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2531                         entry->mask |= MAY_WRITE;
2532                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2533                         entry->mask |= MAY_EXEC;
2534                 nfs_refresh_inode(inode, res.fattr);
2535         }
2536         nfs_free_fattr(res.fattr);
2537         return status;
2538 }
2539
2540 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2541 {
2542         struct nfs4_exception exception = { };
2543         int err;
2544         do {
2545                 err = nfs4_handle_exception(NFS_SERVER(inode),
2546                                 _nfs4_proc_access(inode, entry),
2547                                 &exception);
2548         } while (exception.retry);
2549         return err;
2550 }
2551
2552 /*
2553  * TODO: For the time being, we don't try to get any attributes
2554  * along with any of the zero-copy operations READ, READDIR,
2555  * READLINK, WRITE.
2556  *
2557  * In the case of the first three, we want to put the GETATTR
2558  * after the read-type operation -- this is because it is hard
2559  * to predict the length of a GETATTR response in v4, and thus
2560  * align the READ data correctly.  This means that the GETATTR
2561  * may end up partially falling into the page cache, and we should
2562  * shift it into the 'tail' of the xdr_buf before processing.
2563  * To do this efficiently, we need to know the total length
2564  * of data received, which doesn't seem to be available outside
2565  * of the RPC layer.
2566  *
2567  * In the case of WRITE, we also want to put the GETATTR after
2568  * the operation -- in this case because we want to make sure
2569  * we get the post-operation mtime and size.  This means that
2570  * we can't use xdr_encode_pages() as written: we need a variant
2571  * of it which would leave room in the 'tail' iovec.
2572  *
2573  * Both of these changes to the XDR layer would in fact be quite
2574  * minor, but I decided to leave them for a subsequent patch.
2575  */
2576 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2577                 unsigned int pgbase, unsigned int pglen)
2578 {
2579         struct nfs4_readlink args = {
2580                 .fh       = NFS_FH(inode),
2581                 .pgbase   = pgbase,
2582                 .pglen    = pglen,
2583                 .pages    = &page,
2584         };
2585         struct nfs4_readlink_res res;
2586         struct rpc_message msg = {
2587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2588                 .rpc_argp = &args,
2589                 .rpc_resp = &res,
2590         };
2591
2592         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2593 }
2594
2595 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2596                 unsigned int pgbase, unsigned int pglen)
2597 {
2598         struct nfs4_exception exception = { };
2599         int err;
2600         do {
2601                 err = nfs4_handle_exception(NFS_SERVER(inode),
2602                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2603                                 &exception);
2604         } while (exception.retry);
2605         return err;
2606 }
2607
2608 /*
2609  * Got race?
2610  * We will need to arrange for the VFS layer to provide an atomic open.
2611  * Until then, this create/open method is prone to inefficiency and race
2612  * conditions due to the lookup, create, and open VFS calls from sys_open()
2613  * placed on the wire.
2614  *
2615  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2616  * The file will be opened again in the subsequent VFS open call
2617  * (nfs4_proc_file_open).
2618  *
2619  * The open for read will just hang around to be used by any process that
2620  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2621  */
2622
2623 static int
2624 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2625                  int flags, struct nfs_open_context *ctx)
2626 {
2627         struct dentry *de = dentry;
2628         struct nfs4_state *state;
2629         struct rpc_cred *cred = NULL;
2630         fmode_t fmode = 0;
2631         int status = 0;
2632
2633         if (ctx != NULL) {
2634                 cred = ctx->cred;
2635                 de = ctx->dentry;
2636                 fmode = ctx->mode;
2637         }
2638         sattr->ia_mode &= ~current_umask();
2639         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2640         d_drop(dentry);
2641         if (IS_ERR(state)) {
2642                 status = PTR_ERR(state);
2643                 goto out;
2644         }
2645         d_add(dentry, igrab(state->inode));
2646         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2647         if (ctx != NULL)
2648                 ctx->state = state;
2649         else
2650                 nfs4_close_sync(state, fmode);
2651 out:
2652         return status;
2653 }
2654
2655 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2656 {
2657         struct nfs_server *server = NFS_SERVER(dir);
2658         struct nfs_removeargs args = {
2659                 .fh = NFS_FH(dir),
2660                 .name.len = name->len,
2661                 .name.name = name->name,
2662                 .bitmask = server->attr_bitmask,
2663         };
2664         struct nfs_removeres res = {
2665                 .server = server,
2666         };
2667         struct rpc_message msg = {
2668                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2669                 .rpc_argp = &args,
2670                 .rpc_resp = &res,
2671         };
2672         int status = -ENOMEM;
2673
2674         res.dir_attr = nfs_alloc_fattr();
2675         if (res.dir_attr == NULL)
2676                 goto out;
2677
2678         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2679         if (status == 0) {
2680                 update_changeattr(dir, &res.cinfo);
2681                 nfs_post_op_update_inode(dir, res.dir_attr);
2682         }
2683         nfs_free_fattr(res.dir_attr);
2684 out:
2685         return status;
2686 }
2687
2688 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2689 {
2690         struct nfs4_exception exception = { };
2691         int err;
2692         do {
2693                 err = nfs4_handle_exception(NFS_SERVER(dir),
2694                                 _nfs4_proc_remove(dir, name),
2695                                 &exception);
2696         } while (exception.retry);
2697         return err;
2698 }
2699
2700 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2701 {
2702         struct nfs_server *server = NFS_SERVER(dir);
2703         struct nfs_removeargs *args = msg->rpc_argp;
2704         struct nfs_removeres *res = msg->rpc_resp;
2705
2706         args->bitmask = server->cache_consistency_bitmask;
2707         res->server = server;
2708         res->seq_res.sr_slot = NULL;
2709         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2710 }
2711
2712 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2713 {
2714         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2715
2716         if (!nfs4_sequence_done(task, &res->seq_res))
2717                 return 0;
2718         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2719                 return 0;
2720         update_changeattr(dir, &res->cinfo);
2721         nfs_post_op_update_inode(dir, res->dir_attr);
2722         return 1;
2723 }
2724
2725 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2726 {
2727         struct nfs_server *server = NFS_SERVER(dir);
2728         struct nfs_renameargs *arg = msg->rpc_argp;
2729         struct nfs_renameres *res = msg->rpc_resp;
2730
2731         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2732         arg->bitmask = server->attr_bitmask;
2733         res->server = server;
2734 }
2735
2736 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2737                                  struct inode *new_dir)
2738 {
2739         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2740
2741         if (!nfs4_sequence_done(task, &res->seq_res))
2742                 return 0;
2743         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2744                 return 0;
2745
2746         update_changeattr(old_dir, &res->old_cinfo);
2747         nfs_post_op_update_inode(old_dir, res->old_fattr);
2748         update_changeattr(new_dir, &res->new_cinfo);
2749         nfs_post_op_update_inode(new_dir, res->new_fattr);
2750         return 1;
2751 }
2752
2753 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2754                 struct inode *new_dir, struct qstr *new_name)
2755 {
2756         struct nfs_server *server = NFS_SERVER(old_dir);
2757         struct nfs_renameargs arg = {
2758                 .old_dir = NFS_FH(old_dir),
2759                 .new_dir = NFS_FH(new_dir),
2760                 .old_name = old_name,
2761                 .new_name = new_name,
2762                 .bitmask = server->attr_bitmask,
2763         };
2764         struct nfs_renameres res = {
2765                 .server = server,
2766         };
2767         struct rpc_message msg = {
2768                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2769                 .rpc_argp = &arg,
2770                 .rpc_resp = &res,
2771         };
2772         int status = -ENOMEM;
2773
2774         res.old_fattr = nfs_alloc_fattr();
2775         res.new_fattr = nfs_alloc_fattr();
2776         if (res.old_fattr == NULL || res.new_fattr == NULL)
2777                 goto out;
2778
2779         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2780         if (!status) {
2781                 update_changeattr(old_dir, &res.old_cinfo);
2782                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2783                 update_changeattr(new_dir, &res.new_cinfo);
2784                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2785         }
2786 out:
2787         nfs_free_fattr(res.new_fattr);
2788         nfs_free_fattr(res.old_fattr);
2789         return status;
2790 }
2791
2792 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2793                 struct inode *new_dir, struct qstr *new_name)
2794 {
2795         struct nfs4_exception exception = { };
2796         int err;
2797         do {
2798                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2799                                 _nfs4_proc_rename(old_dir, old_name,
2800                                         new_dir, new_name),
2801                                 &exception);
2802         } while (exception.retry);
2803         return err;
2804 }
2805
2806 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2807 {
2808         struct nfs_server *server = NFS_SERVER(inode);
2809         struct nfs4_link_arg arg = {
2810                 .fh     = NFS_FH(inode),
2811                 .dir_fh = NFS_FH(dir),
2812                 .name   = name,
2813                 .bitmask = server->attr_bitmask,
2814         };
2815         struct nfs4_link_res res = {
2816                 .server = server,
2817         };
2818         struct rpc_message msg = {
2819                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2820                 .rpc_argp = &arg,
2821                 .rpc_resp = &res,
2822         };
2823         int status = -ENOMEM;
2824
2825         res.fattr = nfs_alloc_fattr();
2826         res.dir_attr = nfs_alloc_fattr();
2827         if (res.fattr == NULL || res.dir_attr == NULL)
2828                 goto out;
2829
2830         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2831         if (!status) {
2832                 update_changeattr(dir, &res.cinfo);
2833                 nfs_post_op_update_inode(dir, res.dir_attr);
2834                 nfs_post_op_update_inode(inode, res.fattr);
2835         }
2836 out:
2837         nfs_free_fattr(res.dir_attr);
2838         nfs_free_fattr(res.fattr);
2839         return status;
2840 }
2841
2842 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2843 {
2844         struct nfs4_exception exception = { };
2845         int err;
2846         do {
2847                 err = nfs4_handle_exception(NFS_SERVER(inode),
2848                                 _nfs4_proc_link(inode, dir, name),
2849                                 &exception);
2850         } while (exception.retry);
2851         return err;
2852 }
2853
2854 struct nfs4_createdata {
2855         struct rpc_message msg;
2856         struct nfs4_create_arg arg;
2857         struct nfs4_create_res res;
2858         struct nfs_fh fh;
2859         struct nfs_fattr fattr;
2860         struct nfs_fattr dir_fattr;
2861 };
2862
2863 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2864                 struct qstr *name, struct iattr *sattr, u32 ftype)
2865 {
2866         struct nfs4_createdata *data;
2867
2868         data = kzalloc(sizeof(*data), GFP_KERNEL);
2869         if (data != NULL) {
2870                 struct nfs_server *server = NFS_SERVER(dir);
2871
2872                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2873                 data->msg.rpc_argp = &data->arg;
2874                 data->msg.rpc_resp = &data->res;
2875                 data->arg.dir_fh = NFS_FH(dir);
2876                 data->arg.server = server;
2877                 data->arg.name = name;
2878                 data->arg.attrs = sattr;
2879                 data->arg.ftype = ftype;
2880                 data->arg.bitmask = server->attr_bitmask;
2881                 data->res.server = server;
2882                 data->res.fh = &data->fh;
2883                 data->res.fattr = &data->fattr;
2884                 data->res.dir_fattr = &data->dir_fattr;
2885                 nfs_fattr_init(data->res.fattr);
2886                 nfs_fattr_init(data->res.dir_fattr);
2887         }
2888         return data;
2889 }
2890
2891 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2892 {
2893         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2894                                     &data->arg.seq_args, &data->res.seq_res, 1);
2895         if (status == 0) {
2896                 update_changeattr(dir, &data->res.dir_cinfo);
2897                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2898                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2899         }
2900         return status;
2901 }
2902
2903 static void nfs4_free_createdata(struct nfs4_createdata *data)
2904 {
2905         kfree(data);
2906 }
2907
2908 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2909                 struct page *page, unsigned int len, struct iattr *sattr)
2910 {
2911         struct nfs4_createdata *data;
2912         int status = -ENAMETOOLONG;
2913
2914         if (len > NFS4_MAXPATHLEN)
2915                 goto out;
2916
2917         status = -ENOMEM;
2918         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2919         if (data == NULL)
2920                 goto out;
2921
2922         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2923         data->arg.u.symlink.pages = &page;
2924         data->arg.u.symlink.len = len;
2925
2926         status = nfs4_do_create(dir, dentry, data);
2927
2928         nfs4_free_createdata(data);
2929 out:
2930         return status;
2931 }
2932
2933 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2934                 struct page *page, unsigned int len, struct iattr *sattr)
2935 {
2936         struct nfs4_exception exception = { };
2937         int err;
2938         do {
2939                 err = nfs4_handle_exception(NFS_SERVER(dir),
2940                                 _nfs4_proc_symlink(dir, dentry, page,
2941                                                         len, sattr),
2942                                 &exception);
2943         } while (exception.retry);
2944         return err;
2945 }
2946
2947 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2948                 struct iattr *sattr)
2949 {
2950         struct nfs4_createdata *data;
2951         int status = -ENOMEM;
2952
2953         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2954         if (data == NULL)
2955                 goto out;
2956
2957         status = nfs4_do_create(dir, dentry, data);
2958
2959         nfs4_free_createdata(data);
2960 out:
2961         return status;
2962 }
2963
2964 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2965                 struct iattr *sattr)
2966 {
2967         struct nfs4_exception exception = { };
2968         int err;
2969
2970         sattr->ia_mode &= ~current_umask();
2971         do {
2972                 err = nfs4_handle_exception(NFS_SERVER(dir),
2973                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2974                                 &exception);
2975         } while (exception.retry);
2976         return err;
2977 }
2978
2979 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2980                 u64 cookie, struct page **pages, unsigned int count, int plus)
2981 {
2982         struct inode            *dir = dentry->d_inode;
2983         struct nfs4_readdir_arg args = {
2984                 .fh = NFS_FH(dir),
2985                 .pages = pages,
2986                 .pgbase = 0,
2987                 .count = count,
2988                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2989                 .plus = plus,
2990         };
2991         struct nfs4_readdir_res res;
2992         struct rpc_message msg = {
2993                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2994                 .rpc_argp = &args,
2995                 .rpc_resp = &res,
2996                 .rpc_cred = cred,
2997         };
2998         int                     status;
2999
3000         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3001                         dentry->d_parent->d_name.name,
3002                         dentry->d_name.name,
3003                         (unsigned long long)cookie);
3004         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3005         res.pgbase = args.pgbase;
3006         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3007         if (status >= 0) {
3008                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3009                 status += args.pgbase;
3010         }
3011
3012         nfs_invalidate_atime(dir);
3013
3014         dprintk("%s: returns %d\n", __func__, status);
3015         return status;
3016 }
3017
3018 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3019                 u64 cookie, struct page **pages, unsigned int count, int plus)
3020 {
3021         struct nfs4_exception exception = { };
3022         int err;
3023         do {
3024                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3025                                 _nfs4_proc_readdir(dentry, cred, cookie,
3026                                         pages, count, plus),
3027                                 &exception);
3028         } while (exception.retry);
3029         return err;
3030 }
3031
3032 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3033                 struct iattr *sattr, dev_t rdev)
3034 {
3035         struct nfs4_createdata *data;
3036         int mode = sattr->ia_mode;
3037         int status = -ENOMEM;
3038
3039         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3040         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3041
3042         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3043         if (data == NULL)
3044                 goto out;
3045
3046         if (S_ISFIFO(mode))
3047                 data->arg.ftype = NF4FIFO;
3048         else if (S_ISBLK(mode)) {
3049                 data->arg.ftype = NF4BLK;
3050                 data->arg.u.device.specdata1 = MAJOR(rdev);
3051                 data->arg.u.device.specdata2 = MINOR(rdev);
3052         }
3053         else if (S_ISCHR(mode)) {
3054                 data->arg.ftype = NF4CHR;
3055                 data->arg.u.device.specdata1 = MAJOR(rdev);
3056                 data->arg.u.device.specdata2 = MINOR(rdev);
3057         }
3058
3059         status = nfs4_do_create(dir, dentry, data);
3060
3061         nfs4_free_createdata(data);
3062 out:
3063         return status;
3064 }
3065
3066 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3067                 struct iattr *sattr, dev_t rdev)
3068 {
3069         struct nfs4_exception exception = { };
3070         int err;
3071
3072         sattr->ia_mode &= ~current_umask();
3073         do {
3074                 err = nfs4_handle_exception(NFS_SERVER(dir),
3075                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3076                                 &exception);
3077         } while (exception.retry);
3078         return err;
3079 }
3080
3081 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3082                  struct nfs_fsstat *fsstat)
3083 {
3084         struct nfs4_statfs_arg args = {
3085                 .fh = fhandle,
3086                 .bitmask = server->attr_bitmask,
3087         };
3088         struct nfs4_statfs_res res = {
3089                 .fsstat = fsstat,
3090         };
3091         struct rpc_message msg = {
3092                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3093                 .rpc_argp = &args,
3094                 .rpc_resp = &res,
3095         };
3096
3097         nfs_fattr_init(fsstat->fattr);
3098         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3099 }
3100
3101 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3102 {
3103         struct nfs4_exception exception = { };
3104         int err;
3105         do {
3106                 err = nfs4_handle_exception(server,
3107                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3108                                 &exception);
3109         } while (exception.retry);
3110         return err;
3111 }
3112
3113 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3114                 struct nfs_fsinfo *fsinfo)
3115 {
3116         struct nfs4_fsinfo_arg args = {
3117                 .fh = fhandle,
3118                 .bitmask = server->attr_bitmask,
3119         };
3120         struct nfs4_fsinfo_res res = {
3121                 .fsinfo = fsinfo,
3122         };
3123         struct rpc_message msg = {
3124                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3125                 .rpc_argp = &args,
3126                 .rpc_resp = &res,
3127         };
3128
3129         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3130 }
3131
3132 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3133 {
3134         struct nfs4_exception exception = { };
3135         int err;
3136
3137         do {
3138                 err = nfs4_handle_exception(server,
3139                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3140                                 &exception);
3141         } while (exception.retry);
3142         return err;
3143 }
3144
3145 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3146 {
3147         nfs_fattr_init(fsinfo->fattr);
3148         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3149 }
3150
3151 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3152                 struct nfs_pathconf *pathconf)
3153 {
3154         struct nfs4_pathconf_arg args = {
3155                 .fh = fhandle,
3156                 .bitmask = server->attr_bitmask,
3157         };
3158         struct nfs4_pathconf_res res = {
3159                 .pathconf = pathconf,
3160         };
3161         struct rpc_message msg = {
3162                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3163                 .rpc_argp = &args,
3164                 .rpc_resp = &res,
3165         };
3166
3167         /* None of the pathconf attributes are mandatory to implement */
3168         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3169                 memset(pathconf, 0, sizeof(*pathconf));
3170                 return 0;
3171         }
3172
3173         nfs_fattr_init(pathconf->fattr);
3174         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3175 }
3176
3177 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3178                 struct nfs_pathconf *pathconf)
3179 {
3180         struct nfs4_exception exception = { };
3181         int err;
3182
3183         do {
3184                 err = nfs4_handle_exception(server,
3185                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3186                                 &exception);
3187         } while (exception.retry);
3188         return err;
3189 }
3190
3191 void __nfs4_read_done_cb(struct nfs_read_data *data)
3192 {
3193         nfs_invalidate_atime(data->inode);
3194 }
3195
3196 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3197 {
3198         struct nfs_server *server = NFS_SERVER(data->inode);
3199
3200         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3201                 rpc_restart_call_prepare(task);
3202                 return -EAGAIN;
3203         }
3204
3205         __nfs4_read_done_cb(data);
3206         if (task->tk_status > 0)
3207                 renew_lease(server, data->timestamp);
3208         return 0;
3209 }
3210
3211 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3212 {
3213
3214         dprintk("--> %s\n", __func__);
3215
3216         if (!nfs4_sequence_done(task, &data->res.seq_res))
3217                 return -EAGAIN;
3218
3219         return data->read_done_cb ? data->read_done_cb(task, data) :
3220                                     nfs4_read_done_cb(task, data);
3221 }
3222
3223 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3224 {
3225         data->timestamp   = jiffies;
3226         data->read_done_cb = nfs4_read_done_cb;
3227         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3228 }
3229
3230 /* Reset the the nfs_read_data to send the read to the MDS. */
3231 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3232 {
3233         dprintk("%s Reset task for i/o through\n", __func__);
3234         put_lseg(data->lseg);
3235         data->lseg = NULL;
3236         /* offsets will differ in the dense stripe case */
3237         data->args.offset = data->mds_offset;
3238         data->ds_clp = NULL;
3239         data->args.fh     = NFS_FH(data->inode);
3240         data->read_done_cb = nfs4_read_done_cb;
3241         task->tk_ops = data->mds_ops;
3242         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3243 }
3244 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3245
3246 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3247 {
3248         struct inode *inode = data->inode;
3249
3250         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3251                 rpc_restart_call_prepare(task);
3252                 return -EAGAIN;
3253         }
3254         if (task->tk_status >= 0) {
3255                 renew_lease(NFS_SERVER(inode), data->timestamp);
3256                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3257         }
3258         return 0;
3259 }
3260
3261 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3262 {
3263         if (!nfs4_sequence_done(task, &data->res.seq_res))
3264                 return -EAGAIN;
3265         return data->write_done_cb ? data->write_done_cb(task, data) :
3266                 nfs4_write_done_cb(task, data);
3267 }
3268
3269 /* Reset the the nfs_write_data to send the write to the MDS. */
3270 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3271 {
3272         dprintk("%s Reset task for i/o through\n", __func__);
3273         put_lseg(data->lseg);
3274         data->lseg          = NULL;
3275         data->ds_clp        = NULL;
3276         data->write_done_cb = nfs4_write_done_cb;
3277         data->args.fh       = NFS_FH(data->inode);
3278         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3279         data->args.offset   = data->mds_offset;
3280         data->res.fattr     = &data->fattr;
3281         task->tk_ops        = data->mds_ops;
3282         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3283 }
3284 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3285
3286 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3287 {
3288         struct nfs_server *server = NFS_SERVER(data->inode);
3289
3290         if (data->lseg) {
3291                 data->args.bitmask = NULL;
3292                 data->res.fattr = NULL;
3293         } else
3294                 data->args.bitmask = server->cache_consistency_bitmask;
3295         if (!data->write_done_cb)
3296                 data->write_done_cb = nfs4_write_done_cb;
3297         data->res.server = server;
3298         data->timestamp   = jiffies;
3299
3300         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3301 }
3302
3303 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3304 {
3305         struct inode *inode = data->inode;
3306
3307         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3308                 rpc_restart_call_prepare(task);
3309                 return -EAGAIN;
3310         }
3311         nfs_refresh_inode(inode, data->res.fattr);
3312         return 0;
3313 }
3314
3315 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3316 {
3317         if (!nfs4_sequence_done(task, &data->res.seq_res))
3318                 return -EAGAIN;
3319         return data->write_done_cb(task, data);
3320 }
3321
3322 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3323 {
3324         struct nfs_server *server = NFS_SERVER(data->inode);
3325
3326         if (data->lseg) {
3327                 data->args.bitmask = NULL;
3328                 data->res.fattr = NULL;
3329         } else
3330                 data->args.bitmask = server->cache_consistency_bitmask;
3331         if (!data->write_done_cb)
3332                 data->write_done_cb = nfs4_commit_done_cb;
3333         data->res.server = server;
3334         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3335 }
3336
3337 struct nfs4_renewdata {
3338         struct nfs_client       *client;
3339         unsigned long           timestamp;
3340 };
3341
3342 /*
3343  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3344  * standalone procedure for queueing an asynchronous RENEW.
3345  */
3346 static void nfs4_renew_release(void *calldata)
3347 {
3348         struct nfs4_renewdata *data = calldata;
3349         struct nfs_client *clp = data->client;
3350
3351         if (atomic_read(&clp->cl_count) > 1)
3352                 nfs4_schedule_state_renewal(clp);
3353         nfs_put_client(clp);
3354         kfree(data);
3355 }
3356
3357 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3358 {
3359         struct nfs4_renewdata *data = calldata;
3360         struct nfs_client *clp = data->client;
3361         unsigned long timestamp = data->timestamp;
3362
3363         if (task->tk_status < 0) {
3364                 /* Unless we're shutting down, schedule state recovery! */
3365                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3366                         return;
3367                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3368                         nfs4_schedule_lease_recovery(clp);
3369                         return;
3370                 }
3371                 nfs4_schedule_path_down_recovery(clp);
3372         }
3373         do_renew_lease(clp, timestamp);
3374 }
3375
3376 static const struct rpc_call_ops nfs4_renew_ops = {
3377         .rpc_call_done = nfs4_renew_done,
3378         .rpc_release = nfs4_renew_release,
3379 };
3380
3381 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3382 {
3383         struct rpc_message msg = {
3384                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3385                 .rpc_argp       = clp,
3386                 .rpc_cred       = cred,
3387         };
3388         struct nfs4_renewdata *data;
3389
3390         if (renew_flags == 0)
3391                 return 0;
3392         if (!atomic_inc_not_zero(&clp->cl_count))
3393                 return -EIO;
3394         data = kmalloc(sizeof(*data), GFP_NOFS);
3395         if (data == NULL)
3396                 return -ENOMEM;
3397         data->client = clp;
3398         data->timestamp = jiffies;
3399         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3400                         &nfs4_renew_ops, data);
3401 }
3402
3403 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3404 {
3405         struct rpc_message msg = {
3406                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3407                 .rpc_argp       = clp,
3408                 .rpc_cred       = cred,
3409         };
3410         unsigned long now = jiffies;
3411         int status;
3412
3413         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3414         if (status < 0)
3415                 return status;
3416         do_renew_lease(clp, now);
3417         return 0;
3418 }
3419
3420 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3421 {
3422         return (server->caps & NFS_CAP_ACLS)
3423                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3424                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3425 }
3426
3427 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3428  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3429  * the stack.
3430  */
3431 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3432
3433 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3434                 struct page **pages, unsigned int *pgbase)
3435 {
3436         struct page *newpage, **spages;
3437         int rc = 0;
3438         size_t len;
3439         spages = pages;
3440
3441         do {
3442                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3443                 newpage = alloc_page(GFP_KERNEL);
3444
3445                 if (newpage == NULL)
3446                         goto unwind;
3447                 memcpy(page_address(newpage), buf, len);
3448                 buf += len;
3449                 buflen -= len;
3450                 *pages++ = newpage;
3451                 rc++;
3452         } while (buflen != 0);
3453
3454         return rc;
3455
3456 unwind:
3457         for(; rc > 0; rc--)
3458                 __free_page(spages[rc-1]);
3459         return -ENOMEM;
3460 }
3461
3462 struct nfs4_cached_acl {
3463         int cached;
3464         size_t len;
3465         char data[0];
3466 };
3467
3468 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3469 {
3470         struct nfs_inode *nfsi = NFS_I(inode);
3471
3472         spin_lock(&inode->i_lock);
3473         kfree(nfsi->nfs4_acl);
3474         nfsi->nfs4_acl = acl;
3475         spin_unlock(&inode->i_lock);
3476 }
3477
3478 static void nfs4_zap_acl_attr(struct inode *inode)
3479 {
3480         nfs4_set_cached_acl(inode, NULL);
3481 }
3482
3483 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3484 {
3485         struct nfs_inode *nfsi = NFS_I(inode);
3486         struct nfs4_cached_acl *acl;
3487         int ret = -ENOENT;
3488
3489         spin_lock(&inode->i_lock);
3490         acl = nfsi->nfs4_acl;
3491         if (acl == NULL)
3492                 goto out;
3493         if (buf == NULL) /* user is just asking for length */
3494                 goto out_len;
3495         if (acl->cached == 0)
3496                 goto out;
3497         ret = -ERANGE; /* see getxattr(2) man page */
3498         if (acl->len > buflen)
3499                 goto out;
3500         memcpy(buf, acl->data, acl->len);
3501 out_len:
3502         ret = acl->len;
3503 out:
3504         spin_unlock(&inode->i_lock);
3505         return ret;
3506 }
3507
3508 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3509 {
3510         struct nfs4_cached_acl *acl;
3511
3512         if (buf && acl_len <= PAGE_SIZE) {
3513                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3514                 if (acl == NULL)
3515                         goto out;
3516                 acl->cached = 1;
3517                 memcpy(acl->data, buf, acl_len);
3518         } else {
3519                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3520                 if (acl == NULL)
3521                         goto out;
3522                 acl->cached = 0;
3523         }
3524         acl->len = acl_len;
3525 out:
3526         nfs4_set_cached_acl(inode, acl);
3527 }
3528
3529 /*
3530  * The getxattr API returns the required buffer length when called with a
3531  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3532  * the required buf.  On a NULL buf, we send a page of data to the server
3533  * guessing that the ACL request can be serviced by a page. If so, we cache
3534  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3535  * the cache. If not so, we throw away the page, and cache the required
3536  * length. The next getxattr call will then produce another round trip to
3537  * the server, this time with the input buf of the required size.
3538  */
3539 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3540 {
3541         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3542         struct nfs_getaclargs args = {
3543                 .fh = NFS_FH(inode),
3544                 .acl_pages = pages,
3545                 .acl_len = buflen,
3546         };
3547         struct nfs_getaclres res = {
3548                 .acl_len = buflen,
3549         };
3550         void *resp_buf;
3551         struct rpc_message msg = {
3552                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3553                 .rpc_argp = &args,
3554                 .rpc_resp = &res,
3555         };
3556         int ret = -ENOMEM, npages, i, acl_len = 0;
3557
3558         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3559         /* As long as we're doing a round trip to the server anyway,
3560          * let's be prepared for a page of acl data. */
3561         if (npages == 0)
3562                 npages = 1;
3563
3564         for (i = 0; i < npages; i++) {
3565                 pages[i] = alloc_page(GFP_KERNEL);
3566                 if (!pages[i])
3567                         goto out_free;
3568         }
3569         if (npages > 1) {
3570                 /* for decoding across pages */
3571                 res.acl_scratch = alloc_page(GFP_KERNEL);
3572                 if (!res.acl_scratch)
3573                         goto out_free;
3574         }
3575         args.acl_len = npages * PAGE_SIZE;
3576         args.acl_pgbase = 0;
3577         /* Let decode_getfacl know not to fail if the ACL data is larger than
3578          * the page we send as a guess */
3579         if (buf == NULL)
3580                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3581         resp_buf = page_address(pages[0]);
3582
3583         dprintk("%s  buf %p buflen %ld npages %d args.acl_len %ld\n",
3584                 __func__, buf, buflen, npages, args.acl_len);
3585         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3586                              &msg, &args.seq_args, &res.seq_res, 0);
3587         if (ret)
3588                 goto out_free;
3589
3590         acl_len = res.acl_len - res.acl_data_offset;
3591         if (acl_len > args.acl_len)
3592                 nfs4_write_cached_acl(inode, NULL, acl_len);
3593         else
3594                 nfs4_write_cached_acl(inode, resp_buf + res.acl_data_offset,
3595                                       acl_len);
3596         if (buf) {
3597                 ret = -ERANGE;
3598                 if (acl_len > buflen)
3599                         goto out_free;
3600                 _copy_from_pages(buf, pages, res.acl_data_offset,
3601                                 res.acl_len);
3602         }
3603         ret = acl_len;
3604 out_free:
3605         for (i = 0; i < npages; i++)
3606                 if (pages[i])
3607                         __free_page(pages[i]);
3608         if (res.acl_scratch)
3609                 __free_page(res.acl_scratch);
3610         return ret;
3611 }
3612
3613 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3614 {
3615         struct nfs4_exception exception = { };
3616         ssize_t ret;
3617         do {
3618                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3619                 if (ret >= 0)
3620                         break;
3621                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3622         } while (exception.retry);
3623         return ret;
3624 }
3625
3626 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3627 {
3628         struct nfs_server *server = NFS_SERVER(inode);
3629         int ret;
3630
3631         if (!nfs4_server_supports_acls(server))
3632                 return -EOPNOTSUPP;
3633         ret = nfs_revalidate_inode(server, inode);
3634         if (ret < 0)
3635                 return ret;
3636         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3637                 nfs_zap_acl_cache(inode);
3638         ret = nfs4_read_cached_acl(inode, buf, buflen);
3639         if (ret != -ENOENT)
3640                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3641                  * but no cached acl data, just the acl length */
3642                 return ret;
3643         return nfs4_get_acl_uncached(inode, buf, buflen);
3644 }
3645
3646 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3647 {
3648         struct nfs_server *server = NFS_SERVER(inode);
3649         struct page *pages[NFS4ACL_MAXPAGES];
3650         struct nfs_setaclargs arg = {
3651                 .fh             = NFS_FH(inode),
3652                 .acl_pages      = pages,
3653                 .acl_len        = buflen,
3654         };
3655         struct nfs_setaclres res;
3656         struct rpc_message msg = {
3657                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3658                 .rpc_argp       = &arg,
3659                 .rpc_resp       = &res,
3660         };
3661         int ret, i;
3662
3663         if (!nfs4_server_supports_acls(server))
3664                 return -EOPNOTSUPP;
3665         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3666         if (i < 0)
3667                 return i;
3668         nfs_inode_return_delegation(inode);
3669         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3670
3671         /*
3672          * Free each page after tx, so the only ref left is
3673          * held by the network stack
3674          */
3675         for (; i > 0; i--)
3676                 put_page(pages[i-1]);
3677
3678         /*
3679          * Acl update can result in inode attribute update.
3680          * so mark the attribute cache invalid.
3681          */
3682         spin_lock(&inode->i_lock);
3683         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3684         spin_unlock(&inode->i_lock);
3685         nfs_access_zap_cache(inode);
3686         nfs_zap_acl_cache(inode);
3687         return ret;
3688 }
3689
3690 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3691 {
3692         struct nfs4_exception exception = { };
3693         int err;
3694         do {
3695                 err = nfs4_handle_exception(NFS_SERVER(inode),
3696                                 __nfs4_proc_set_acl(inode, buf, buflen),
3697                                 &exception);
3698         } while (exception.retry);
3699         return err;
3700 }
3701
3702 static int
3703 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3704 {
3705         struct nfs_client *clp = server->nfs_client;
3706
3707         if (task->tk_status >= 0)
3708                 return 0;
3709         switch(task->tk_status) {
3710                 case -NFS4ERR_ADMIN_REVOKED:
3711                 case -NFS4ERR_BAD_STATEID:
3712                 case -NFS4ERR_OPENMODE:
3713                         if (state == NULL)
3714                                 break;
3715                         nfs4_schedule_stateid_recovery(server, state);
3716                         goto wait_on_recovery;
3717                 case -NFS4ERR_EXPIRED:
3718                         if (state != NULL)
3719                                 nfs4_schedule_stateid_recovery(server, state);
3720                 case -NFS4ERR_STALE_STATEID:
3721                 case -NFS4ERR_STALE_CLIENTID:
3722                         nfs4_schedule_lease_recovery(clp);
3723                         goto wait_on_recovery;
3724 #if defined(CONFIG_NFS_V4_1)
3725                 case -NFS4ERR_BADSESSION:
3726                 case -NFS4ERR_BADSLOT:
3727                 case -NFS4ERR_BAD_HIGH_SLOT:
3728                 case -NFS4ERR_DEADSESSION:
3729                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3730                 case -NFS4ERR_SEQ_FALSE_RETRY:
3731                 case -NFS4ERR_SEQ_MISORDERED:
3732                         dprintk("%s ERROR %d, Reset session\n", __func__,
3733                                 task->tk_status);
3734                         nfs4_schedule_session_recovery(clp->cl_session);
3735                         task->tk_status = 0;
3736                         return -EAGAIN;
3737 #endif /* CONFIG_NFS_V4_1 */
3738                 case -NFS4ERR_DELAY:
3739                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3740                 case -NFS4ERR_GRACE:
3741                 case -EKEYEXPIRED:
3742                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3743                         task->tk_status = 0;
3744                         return -EAGAIN;
3745                 case -NFS4ERR_RETRY_UNCACHED_REP:
3746                 case -NFS4ERR_OLD_STATEID:
3747                         task->tk_status = 0;
3748                         return -EAGAIN;
3749         }
3750         task->tk_status = nfs4_map_errors(task->tk_status);
3751         return 0;
3752 wait_on_recovery:
3753         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3754         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3755                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3756         task->tk_status = 0;
3757         return -EAGAIN;
3758 }
3759
3760 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3761                 unsigned short port, struct rpc_cred *cred,
3762                 struct nfs4_setclientid_res *res)
3763 {
3764         nfs4_verifier sc_verifier;
3765         struct nfs4_setclientid setclientid = {
3766                 .sc_verifier = &sc_verifier,
3767                 .sc_prog = program,
3768                 .sc_cb_ident = clp->cl_cb_ident,
3769         };
3770         struct rpc_message msg = {
3771                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3772                 .rpc_argp = &setclientid,
3773                 .rpc_resp = res,
3774                 .rpc_cred = cred,
3775         };
3776         __be32 *p;
3777         int loop = 0;
3778         int status;
3779
3780         p = (__be32*)sc_verifier.data;
3781         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3782         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3783
3784         for(;;) {
3785                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3786                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3787                                 clp->cl_ipaddr,
3788                                 rpc_peeraddr2str(clp->cl_rpcclient,
3789                                                         RPC_DISPLAY_ADDR),
3790                                 rpc_peeraddr2str(clp->cl_rpcclient,
3791                                                         RPC_DISPLAY_PROTO),
3792                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3793                                 clp->cl_id_uniquifier);
3794                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3795                                 sizeof(setclientid.sc_netid),
3796                                 rpc_peeraddr2str(clp->cl_rpcclient,
3797                                                         RPC_DISPLAY_NETID));
3798                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3799                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3800                                 clp->cl_ipaddr, port >> 8, port & 255);
3801
3802                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3803                 if (status != -NFS4ERR_CLID_INUSE)
3804                         break;
3805                 if (loop != 0) {
3806                         ++clp->cl_id_uniquifier;
3807                         break;
3808                 }
3809                 ++loop;
3810                 ssleep(clp->cl_lease_time / HZ + 1);
3811         }
3812         return status;
3813 }
3814
3815 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3816                 struct nfs4_setclientid_res *arg,
3817                 struct rpc_cred *cred)
3818 {
3819         struct nfs_fsinfo fsinfo;
3820         struct rpc_message msg = {
3821                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3822                 .rpc_argp = arg,
3823                 .rpc_resp = &fsinfo,
3824                 .rpc_cred = cred,
3825         };
3826         unsigned long now;
3827         int status;
3828
3829         now = jiffies;
3830         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3831         if (status == 0) {
3832                 spin_lock(&clp->cl_lock);
3833                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3834                 clp->cl_last_renewal = now;
3835                 spin_unlock(&clp->cl_lock);
3836         }
3837         return status;
3838 }
3839
3840 struct nfs4_delegreturndata {
3841         struct nfs4_delegreturnargs args;
3842         struct nfs4_delegreturnres res;
3843         struct nfs_fh fh;
3844         nfs4_stateid stateid;
3845         unsigned long timestamp;
3846         struct nfs_fattr fattr;
3847         int rpc_status;
3848 };
3849
3850 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3851 {
3852         struct nfs4_delegreturndata *data = calldata;
3853
3854         if (!nfs4_sequence_done(task, &data->res.seq_res))
3855                 return;
3856
3857         switch (task->tk_status) {
3858         case -NFS4ERR_STALE_STATEID:
3859         case -NFS4ERR_EXPIRED:
3860         case 0:
3861                 renew_lease(data->res.server, data->timestamp);
3862                 break;
3863         default:
3864                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3865                                 -EAGAIN) {
3866                         rpc_restart_call_prepare(task);
3867                         return;
3868                 }
3869         }
3870         data->rpc_status = task->tk_status;
3871 }
3872
3873 static void nfs4_delegreturn_release(void *calldata)
3874 {
3875         kfree(calldata);
3876 }
3877
3878 #if defined(CONFIG_NFS_V4_1)
3879 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3880 {
3881         struct nfs4_delegreturndata *d_data;
3882
3883         d_data = (struct nfs4_delegreturndata *)data;
3884
3885         if (nfs4_setup_sequence(d_data->res.server,
3886                                 &d_data->args.seq_args,
3887                                 &d_data->res.seq_res, 1, task))
3888                 return;
3889         rpc_call_start(task);
3890 }
3891 #endif /* CONFIG_NFS_V4_1 */
3892
3893 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3894 #if defined(CONFIG_NFS_V4_1)
3895         .rpc_call_prepare = nfs4_delegreturn_prepare,
3896 #endif /* CONFIG_NFS_V4_1 */
3897         .rpc_call_done = nfs4_delegreturn_done,
3898         .rpc_release = nfs4_delegreturn_release,
3899 };
3900
3901 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3902 {
3903         struct nfs4_delegreturndata *data;
3904         struct nfs_server *server = NFS_SERVER(inode);
3905         struct rpc_task *task;
3906         struct rpc_message msg = {
3907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3908                 .rpc_cred = cred,
3909         };
3910         struct rpc_task_setup task_setup_data = {
3911                 .rpc_client = server->client,
3912                 .rpc_message = &msg,
3913                 .callback_ops = &nfs4_delegreturn_ops,
3914                 .flags = RPC_TASK_ASYNC,
3915         };
3916         int status = 0;
3917
3918         data = kzalloc(sizeof(*data), GFP_NOFS);
3919         if (data == NULL)
3920                 return -ENOMEM;
3921         data->args.fhandle = &data->fh;
3922         data->args.stateid = &data->stateid;
3923         data->args.bitmask = server->attr_bitmask;
3924         nfs_copy_fh(&data->fh, NFS_FH(inode));
3925         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3926         data->res.fattr = &data->fattr;
3927         data->res.server = server;
3928         nfs_fattr_init(data->res.fattr);
3929         data->timestamp = jiffies;
3930         data->rpc_status = 0;
3931
3932         task_setup_data.callback_data = data;
3933         msg.rpc_argp = &data->args;
3934         msg.rpc_resp = &data->res;
3935         task = rpc_run_task(&task_setup_data);
3936         if (IS_ERR(task))
3937                 return PTR_ERR(task);
3938         if (!issync)
3939                 goto out;
3940         status = nfs4_wait_for_completion_rpc_task(task);
3941         if (status != 0)
3942                 goto out;
3943         status = data->rpc_status;
3944         if (status != 0)
3945                 goto out;
3946         nfs_refresh_inode(inode, &data->fattr);
3947 out:
3948         rpc_put_task(task);
3949         return status;
3950 }
3951
3952 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3953 {
3954         struct nfs_server *server = NFS_SERVER(inode);
3955         struct nfs4_exception exception = { };
3956         int err;
3957         do {
3958                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3959                 switch (err) {
3960                         case -NFS4ERR_STALE_STATEID:
3961                         case -NFS4ERR_EXPIRED:
3962                         case 0:
3963                                 return 0;
3964                 }
3965                 err = nfs4_handle_exception(server, err, &exception);
3966         } while (exception.retry);
3967         return err;
3968 }
3969
3970 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3971 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3972
3973 /*
3974  * sleep, with exponential backoff, and retry the LOCK operation.
3975  */
3976 static unsigned long
3977 nfs4_set_lock_task_retry(unsigned long timeout)
3978 {
3979         schedule_timeout_killable(timeout);
3980         timeout <<= 1;
3981         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3982                 return NFS4_LOCK_MAXTIMEOUT;
3983         return timeout;
3984 }
3985
3986 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3987 {
3988         struct inode *inode = state->inode;
3989         struct nfs_server *server = NFS_SERVER(inode);
3990         struct nfs_client *clp = server->nfs_client;
3991         struct nfs_lockt_args arg = {
3992                 .fh = NFS_FH(inode),
3993                 .fl = request,
3994         };
3995         struct nfs_lockt_res res = {
3996                 .denied = request,
3997         };
3998         struct rpc_message msg = {
3999                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4000                 .rpc_argp       = &arg,
4001                 .rpc_resp       = &res,
4002                 .rpc_cred       = state->owner->so_cred,
4003         };
4004         struct nfs4_lock_state *lsp;
4005         int status;
4006
4007         arg.lock_owner.clientid = clp->cl_clientid;
4008         status = nfs4_set_lock_state(state, request);
4009         if (status != 0)
4010                 goto out;
4011         lsp = request->fl_u.nfs4_fl.owner;
4012         arg.lock_owner.id = lsp->ls_id.id;
4013         arg.lock_owner.s_dev = server->s_dev;
4014         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4015         switch (status) {
4016                 case 0:
4017                         request->fl_type = F_UNLCK;
4018                         break;
4019                 case -NFS4ERR_DENIED:
4020                         status = 0;
4021         }
4022         request->fl_ops->fl_release_private(request);
4023 out:
4024         return status;
4025 }
4026
4027 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4028 {
4029         struct nfs4_exception exception = { };
4030         int err;
4031
4032         do {
4033                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4034                                 _nfs4_proc_getlk(state, cmd, request),
4035                                 &exception);
4036         } while (exception.retry);
4037         return err;
4038 }
4039
4040 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4041 {
4042         int res = 0;
4043         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4044                 case FL_POSIX:
4045                         res = posix_lock_file_wait(file, fl);
4046                         break;
4047                 case FL_FLOCK:
4048                         res = flock_lock_file_wait(file, fl);
4049                         break;
4050                 default:
4051                         BUG();
4052         }
4053         return res;
4054 }
4055
4056 struct nfs4_unlockdata {
4057         struct nfs_locku_args arg;
4058         struct nfs_locku_res res;
4059         struct nfs4_lock_state *lsp;
4060         struct nfs_open_context *ctx;
4061         struct file_lock fl;
4062         const struct nfs_server *server;
4063         unsigned long timestamp;
4064 };
4065
4066 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4067                 struct nfs_open_context *ctx,
4068                 struct nfs4_lock_state *lsp,
4069                 struct nfs_seqid *seqid)
4070 {
4071         struct nfs4_unlockdata *p;
4072         struct inode *inode = lsp->ls_state->inode;
4073
4074         p = kzalloc(sizeof(*p), GFP_NOFS);
4075         if (p == NULL)
4076                 return NULL;
4077         p->arg.fh = NFS_FH(inode);
4078         p->arg.fl = &p->fl;
4079         p->arg.seqid = seqid;
4080         p->res.seqid = seqid;
4081         p->arg.stateid = &lsp->ls_stateid;
4082         p->lsp = lsp;
4083         atomic_inc(&lsp->ls_count);
4084         /* Ensure we don't close file until we're done freeing locks! */
4085         p->ctx = get_nfs_open_context(ctx);
4086         memcpy(&p->fl, fl, sizeof(p->fl));
4087         p->server = NFS_SERVER(inode);
4088         return p;
4089 }
4090
4091 static void nfs4_locku_release_calldata(void *data)
4092 {
4093         struct nfs4_unlockdata *calldata = data;
4094         nfs_free_seqid(calldata->arg.seqid);
4095         nfs4_put_lock_state(calldata->lsp);
4096         put_nfs_open_context(calldata->ctx);
4097         kfree(calldata);
4098 }
4099
4100 static void nfs4_locku_done(struct rpc_task *task, void *data)
4101 {
4102         struct nfs4_unlockdata *calldata = data;
4103
4104         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4105                 return;
4106         switch (task->tk_status) {
4107                 case 0:
4108                         memcpy(calldata->lsp->ls_stateid.data,
4109                                         calldata->res.stateid.data,
4110                                         sizeof(calldata->lsp->ls_stateid.data));
4111                         renew_lease(calldata->server, calldata->timestamp);
4112                         break;
4113                 case -NFS4ERR_BAD_STATEID:
4114                 case -NFS4ERR_OLD_STATEID:
4115                 case -NFS4ERR_STALE_STATEID:
4116                 case -NFS4ERR_EXPIRED:
4117                         break;
4118                 default:
4119                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4120                                 rpc_restart_call_prepare(task);
4121         }
4122 }
4123
4124 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4125 {
4126         struct nfs4_unlockdata *calldata = data;
4127
4128         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4129                 return;
4130         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4131                 /* Note: exit _without_ running nfs4_locku_done */
4132                 task->tk_action = NULL;
4133                 return;
4134         }
4135         calldata->timestamp = jiffies;
4136         if (nfs4_setup_sequence(calldata->server,
4137                                 &calldata->arg.seq_args,
4138                                 &calldata->res.seq_res, 1, task))
4139                 return;
4140         rpc_call_start(task);
4141 }
4142
4143 static const struct rpc_call_ops nfs4_locku_ops = {
4144         .rpc_call_prepare = nfs4_locku_prepare,
4145         .rpc_call_done = nfs4_locku_done,
4146         .rpc_release = nfs4_locku_release_calldata,
4147 };
4148
4149 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4150                 struct nfs_open_context *ctx,
4151                 struct nfs4_lock_state *lsp,
4152                 struct nfs_seqid *seqid)
4153 {
4154         struct nfs4_unlockdata *data;
4155         struct rpc_message msg = {
4156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4157                 .rpc_cred = ctx->cred,
4158         };
4159         struct rpc_task_setup task_setup_data = {
4160                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4161                 .rpc_message = &msg,
4162                 .callback_ops = &nfs4_locku_ops,
4163                 .workqueue = nfsiod_workqueue,
4164                 .flags = RPC_TASK_ASYNC,
4165         };
4166
4167         /* Ensure this is an unlock - when canceling a lock, the
4168          * canceled lock is passed in, and it won't be an unlock.
4169          */
4170         fl->fl_type = F_UNLCK;
4171
4172         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4173         if (data == NULL) {
4174                 nfs_free_seqid(seqid);
4175                 return ERR_PTR(-ENOMEM);
4176         }
4177
4178         msg.rpc_argp = &data->arg;
4179         msg.rpc_resp = &data->res;
4180         task_setup_data.callback_data = data;
4181         return rpc_run_task(&task_setup_data);
4182 }
4183
4184 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4185 {
4186         struct nfs_inode *nfsi = NFS_I(state->inode);
4187         struct nfs_seqid *seqid;
4188         struct nfs4_lock_state *lsp;
4189         struct rpc_task *task;
4190         int status = 0;
4191         unsigned char fl_flags = request->fl_flags;
4192
4193         status = nfs4_set_lock_state(state, request);
4194         /* Unlock _before_ we do the RPC call */
4195         request->fl_flags |= FL_EXISTS;
4196         down_read(&nfsi->rwsem);
4197         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4198                 up_read(&nfsi->rwsem);
4199                 goto out;
4200         }
4201         up_read(&nfsi->rwsem);
4202         if (status != 0)
4203                 goto out;
4204         /* Is this a delegated lock? */
4205         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4206                 goto out;
4207         lsp = request->fl_u.nfs4_fl.owner;
4208         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4209         status = -ENOMEM;
4210         if (seqid == NULL)
4211                 goto out;
4212         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4213         status = PTR_ERR(task);
4214         if (IS_ERR(task))
4215                 goto out;
4216         status = nfs4_wait_for_completion_rpc_task(task);
4217         rpc_put_task(task);
4218 out:
4219         request->fl_flags = fl_flags;
4220         return status;
4221 }
4222
4223 struct nfs4_lockdata {
4224         struct nfs_lock_args arg;
4225         struct nfs_lock_res res;
4226         struct nfs4_lock_state *lsp;
4227         struct nfs_open_context *ctx;
4228         struct file_lock fl;
4229         unsigned long timestamp;
4230         int rpc_status;
4231         int cancelled;
4232         struct nfs_server *server;
4233 };
4234
4235 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4236                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4237                 gfp_t gfp_mask)
4238 {
4239         struct nfs4_lockdata *p;
4240         struct inode *inode = lsp->ls_state->inode;
4241         struct nfs_server *server = NFS_SERVER(inode);
4242
4243         p = kzalloc(sizeof(*p), gfp_mask);
4244         if (p == NULL)
4245                 return NULL;
4246
4247         p->arg.fh = NFS_FH(inode);
4248         p->arg.fl = &p->fl;
4249         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4250         if (p->arg.open_seqid == NULL)
4251                 goto out_free;
4252         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4253         if (p->arg.lock_seqid == NULL)
4254                 goto out_free_seqid;
4255         p->arg.lock_stateid = &lsp->ls_stateid;
4256         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4257         p->arg.lock_owner.id = lsp->ls_id.id;
4258         p->arg.lock_owner.s_dev = server->s_dev;
4259         p->res.lock_seqid = p->arg.lock_seqid;
4260         p->lsp = lsp;
4261         p->server = server;
4262         atomic_inc(&lsp->ls_count);
4263         p->ctx = get_nfs_open_context(ctx);
4264         memcpy(&p->fl, fl, sizeof(p->fl));
4265         return p;
4266 out_free_seqid:
4267         nfs_free_seqid(p->arg.open_seqid);
4268 out_free:
4269         kfree(p);
4270         return NULL;
4271 }
4272
4273 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4274 {
4275         struct nfs4_lockdata *data = calldata;
4276         struct nfs4_state *state = data->lsp->ls_state;
4277
4278         dprintk("%s: begin!\n", __func__);
4279         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4280                 return;
4281         /* Do we need to do an open_to_lock_owner? */
4282         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4283                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4284                         return;
4285                 data->arg.open_stateid = &state->stateid;
4286                 data->arg.new_lock_owner = 1;
4287                 data->res.open_seqid = data->arg.open_seqid;
4288         } else
4289                 data->arg.new_lock_owner = 0;
4290         data->timestamp = jiffies;
4291         if (nfs4_setup_sequence(data->server,
4292                                 &data->arg.seq_args,
4293                                 &data->res.seq_res, 1, task))
4294                 return;
4295         rpc_call_start(task);
4296         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4297 }
4298
4299 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4300 {
4301         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4302         nfs4_lock_prepare(task, calldata);
4303 }
4304
4305 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4306 {
4307         struct nfs4_lockdata *data = calldata;
4308
4309         dprintk("%s: begin!\n", __func__);
4310
4311         if (!nfs4_sequence_done(task, &data->res.seq_res))
4312                 return;
4313
4314         data->rpc_status = task->tk_status;
4315         if (data->arg.new_lock_owner != 0) {
4316                 if (data->rpc_status == 0)
4317                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4318                 else
4319                         goto out;
4320         }
4321         if (data->rpc_status == 0) {
4322                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4323                                         sizeof(data->lsp->ls_stateid.data));
4324                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4325                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4326         }
4327 out:
4328         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4329 }
4330
4331 static void nfs4_lock_release(void *calldata)
4332 {
4333         struct nfs4_lockdata *data = calldata;
4334
4335         dprintk("%s: begin!\n", __func__);
4336         nfs_free_seqid(data->arg.open_seqid);
4337         if (data->cancelled != 0) {
4338                 struct rpc_task *task;
4339                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4340                                 data->arg.lock_seqid);
4341                 if (!IS_ERR(task))
4342                         rpc_put_task_async(task);
4343                 dprintk("%s: cancelling lock!\n", __func__);
4344         } else
4345                 nfs_free_seqid(data->arg.lock_seqid);
4346         nfs4_put_lock_state(data->lsp);
4347         put_nfs_open_context(data->ctx);
4348         kfree(data);
4349         dprintk("%s: done!\n", __func__);
4350 }
4351
4352 static const struct rpc_call_ops nfs4_lock_ops = {
4353         .rpc_call_prepare = nfs4_lock_prepare,
4354         .rpc_call_done = nfs4_lock_done,
4355         .rpc_release = nfs4_lock_release,
4356 };
4357
4358 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4359         .rpc_call_prepare = nfs4_recover_lock_prepare,
4360         .rpc_call_done = nfs4_lock_done,
4361         .rpc_release = nfs4_lock_release,
4362 };
4363
4364 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4365 {
4366         switch (error) {
4367         case -NFS4ERR_ADMIN_REVOKED:
4368         case -NFS4ERR_BAD_STATEID:
4369                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4370                 if (new_lock_owner != 0 ||
4371                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4372                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4373                 break;
4374         case -NFS4ERR_STALE_STATEID:
4375                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4376         case -NFS4ERR_EXPIRED:
4377                 nfs4_schedule_lease_recovery(server->nfs_client);
4378         };
4379 }
4380
4381 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4382 {
4383         struct nfs4_lockdata *data;
4384         struct rpc_task *task;
4385         struct rpc_message msg = {
4386                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4387                 .rpc_cred = state->owner->so_cred,
4388         };
4389         struct rpc_task_setup task_setup_data = {
4390                 .rpc_client = NFS_CLIENT(state->inode),
4391                 .rpc_message = &msg,
4392                 .callback_ops = &nfs4_lock_ops,
4393                 .workqueue = nfsiod_workqueue,
4394                 .flags = RPC_TASK_ASYNC,
4395         };
4396         int ret;
4397
4398         dprintk("%s: begin!\n", __func__);
4399         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4400                         fl->fl_u.nfs4_fl.owner,
4401                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4402         if (data == NULL)
4403                 return -ENOMEM;
4404         if (IS_SETLKW(cmd))
4405                 data->arg.block = 1;
4406         if (recovery_type > NFS_LOCK_NEW) {
4407                 if (recovery_type == NFS_LOCK_RECLAIM)
4408                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4409                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4410         }
4411         msg.rpc_argp = &data->arg;
4412         msg.rpc_resp = &data->res;
4413         task_setup_data.callback_data = data;
4414         task = rpc_run_task(&task_setup_data);
4415         if (IS_ERR(task))
4416                 return PTR_ERR(task);
4417         ret = nfs4_wait_for_completion_rpc_task(task);
4418         if (ret == 0) {
4419                 ret = data->rpc_status;
4420                 if (ret)
4421                         nfs4_handle_setlk_error(data->server, data->lsp,
4422                                         data->arg.new_lock_owner, ret);
4423         } else
4424                 data->cancelled = 1;
4425         rpc_put_task(task);
4426         dprintk("%s: done, ret = %d!\n", __func__, ret);
4427         return ret;
4428 }
4429
4430 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4431 {
4432         struct nfs_server *server = NFS_SERVER(state->inode);
4433         struct nfs4_exception exception = { };
4434         int err;
4435
4436         do {
4437                 /* Cache the lock if possible... */
4438                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4439                         return 0;
4440                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4441                 if (err != -NFS4ERR_DELAY)
4442                         break;
4443                 nfs4_handle_exception(server, err, &exception);
4444         } while (exception.retry);
4445         return err;
4446 }
4447
4448 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4449 {
4450         struct nfs_server *server = NFS_SERVER(state->inode);
4451         struct nfs4_exception exception = { };
4452         int err;
4453
4454         err = nfs4_set_lock_state(state, request);
4455         if (err != 0)
4456                 return err;
4457         do {
4458                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4459                         return 0;
4460                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4461                 switch (err) {
4462                 default:
4463                         goto out;
4464                 case -NFS4ERR_GRACE:
4465                 case -NFS4ERR_DELAY:
4466                         nfs4_handle_exception(server, err, &exception);
4467                         err = 0;
4468                 }
4469         } while (exception.retry);
4470 out:
4471         return err;
4472 }
4473
4474 #if defined(CONFIG_NFS_V4_1)
4475 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4476 {
4477         int status;
4478         struct nfs_server *server = NFS_SERVER(state->inode);
4479
4480         status = nfs41_test_stateid(server, state);
4481         if (status == NFS_OK)
4482                 return 0;
4483         nfs41_free_stateid(server, state);
4484         return nfs4_lock_expired(state, request);
4485 }
4486 #endif
4487
4488 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4489 {
4490         struct nfs_inode *nfsi = NFS_I(state->inode);
4491         unsigned char fl_flags = request->fl_flags;
4492         int status = -ENOLCK;
4493
4494         if ((fl_flags & FL_POSIX) &&
4495                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4496                 goto out;
4497         /* Is this a delegated open? */
4498         status = nfs4_set_lock_state(state, request);
4499         if (status != 0)
4500                 goto out;
4501         request->fl_flags |= FL_ACCESS;
4502         status = do_vfs_lock(request->fl_file, request);
4503         if (status < 0)
4504                 goto out;
4505         down_read(&nfsi->rwsem);
4506         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4507                 /* Yes: cache locks! */
4508                 /* ...but avoid races with delegation recall... */
4509                 request->fl_flags = fl_flags & ~FL_SLEEP;
4510                 status = do_vfs_lock(request->fl_file, request);
4511                 goto out_unlock;
4512         }
4513         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4514         if (status != 0)
4515                 goto out_unlock;
4516         /* Note: we always want to sleep here! */
4517         request->fl_flags = fl_flags | FL_SLEEP;
4518         if (do_vfs_lock(request->fl_file, request) < 0)
4519                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4520 out_unlock:
4521         up_read(&nfsi->rwsem);
4522 out:
4523         request->fl_flags = fl_flags;
4524         return status;
4525 }
4526
4527 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4528 {
4529         struct nfs4_exception exception = { };
4530         int err;
4531
4532         do {
4533                 err = _nfs4_proc_setlk(state, cmd, request);
4534                 if (err == -NFS4ERR_DENIED)
4535                         err = -EAGAIN;
4536                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4537                                 err, &exception);
4538         } while (exception.retry);
4539         return err;
4540 }
4541
4542 static int
4543 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4544 {
4545         struct nfs_open_context *ctx;
4546         struct nfs4_state *state;
4547         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4548         int status;
4549
4550         /* verify open state */
4551         ctx = nfs_file_open_context(filp);
4552         state = ctx->state;
4553
4554         if (request->fl_start < 0 || request->fl_end < 0)
4555                 return -EINVAL;
4556
4557         if (IS_GETLK(cmd)) {
4558                 if (state != NULL)
4559                         return nfs4_proc_getlk(state, F_GETLK, request);
4560                 return 0;
4561         }
4562
4563         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4564                 return -EINVAL;
4565
4566         if (request->fl_type == F_UNLCK) {
4567                 if (state != NULL)
4568                         return nfs4_proc_unlck(state, cmd, request);
4569                 return 0;
4570         }
4571
4572         if (state == NULL)
4573                 return -ENOLCK;
4574         do {
4575                 status = nfs4_proc_setlk(state, cmd, request);
4576                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4577                         break;
4578                 timeout = nfs4_set_lock_task_retry(timeout);
4579                 status = -ERESTARTSYS;
4580                 if (signalled())
4581                         break;
4582         } while(status < 0);
4583         return status;
4584 }
4585
4586 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4587 {
4588         struct nfs_server *server = NFS_SERVER(state->inode);
4589         struct nfs4_exception exception = { };
4590         int err;
4591
4592         err = nfs4_set_lock_state(state, fl);
4593         if (err != 0)
4594                 goto out;
4595         do {
4596                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4597                 switch (err) {
4598                         default:
4599                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4600                                                 __func__, err);
4601                         case 0:
4602                         case -ESTALE:
4603                                 goto out;
4604                         case -NFS4ERR_EXPIRED:
4605                                 nfs4_schedule_stateid_recovery(server, state);
4606                         case -NFS4ERR_STALE_CLIENTID:
4607                         case -NFS4ERR_STALE_STATEID:
4608                                 nfs4_schedule_lease_recovery(server->nfs_client);
4609                                 goto out;
4610                         case -NFS4ERR_BADSESSION:
4611                         case -NFS4ERR_BADSLOT:
4612                         case -NFS4ERR_BAD_HIGH_SLOT:
4613                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4614                         case -NFS4ERR_DEADSESSION:
4615                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4616                                 goto out;
4617                         case -ERESTARTSYS:
4618                                 /*
4619                                  * The show must go on: exit, but mark the
4620                                  * stateid as needing recovery.
4621                                  */
4622                         case -NFS4ERR_ADMIN_REVOKED:
4623                         case -NFS4ERR_BAD_STATEID:
4624                         case -NFS4ERR_OPENMODE:
4625                                 nfs4_schedule_stateid_recovery(server, state);
4626                                 err = 0;
4627                                 goto out;
4628                         case -EKEYEXPIRED:
4629                                 /*
4630                                  * User RPCSEC_GSS context has expired.
4631                                  * We cannot recover this stateid now, so
4632                                  * skip it and allow recovery thread to
4633                                  * proceed.
4634                                  */
4635                                 err = 0;
4636                                 goto out;
4637                         case -ENOMEM:
4638                         case -NFS4ERR_DENIED:
4639                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4640                                 err = 0;
4641                                 goto out;
4642                         case -NFS4ERR_DELAY:
4643                                 break;
4644                 }
4645                 err = nfs4_handle_exception(server, err, &exception);
4646         } while (exception.retry);
4647 out:
4648         return err;
4649 }
4650
4651 static void nfs4_release_lockowner_release(void *calldata)
4652 {
4653         kfree(calldata);
4654 }
4655
4656 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4657         .rpc_release = nfs4_release_lockowner_release,
4658 };
4659
4660 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4661 {
4662         struct nfs_server *server = lsp->ls_state->owner->so_server;
4663         struct nfs_release_lockowner_args *args;
4664         struct rpc_message msg = {
4665                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4666         };
4667
4668         if (server->nfs_client->cl_mvops->minor_version != 0)
4669                 return;
4670         args = kmalloc(sizeof(*args), GFP_NOFS);
4671         if (!args)
4672                 return;
4673         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4674         args->lock_owner.id = lsp->ls_id.id;
4675         args->lock_owner.s_dev = server->s_dev;
4676         msg.rpc_argp = args;
4677         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4678 }
4679
4680 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4681
4682 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4683                                    const void *buf, size_t buflen,
4684                                    int flags, int type)
4685 {
4686         if (strcmp(key, "") != 0)
4687                 return -EINVAL;
4688
4689         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4690 }
4691
4692 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4693                                    void *buf, size_t buflen, int type)
4694 {
4695         if (strcmp(key, "") != 0)
4696                 return -EINVAL;
4697
4698         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4699 }
4700
4701 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4702                                        size_t list_len, const char *name,
4703                                        size_t name_len, int type)
4704 {
4705         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4706
4707         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4708                 return 0;
4709
4710         if (list && len <= list_len)
4711                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4712         return len;
4713 }
4714
4715 /*
4716  * nfs_fhget will use either the mounted_on_fileid or the fileid
4717  */
4718 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4719 {
4720         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4721                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4722               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4723               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4724                 return;
4725
4726         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4727                 NFS_ATTR_FATTR_NLINK;
4728         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4729         fattr->nlink = 2;
4730 }
4731
4732 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4733                 struct nfs4_fs_locations *fs_locations, struct page *page)
4734 {
4735         struct nfs_server *server = NFS_SERVER(dir);
4736         u32 bitmask[2] = {
4737                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4738         };
4739         struct nfs4_fs_locations_arg args = {
4740                 .dir_fh = NFS_FH(dir),
4741                 .name = name,
4742                 .page = page,
4743                 .bitmask = bitmask,
4744         };
4745         struct nfs4_fs_locations_res res = {
4746                 .fs_locations = fs_locations,
4747         };
4748         struct rpc_message msg = {
4749                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4750                 .rpc_argp = &args,
4751                 .rpc_resp = &res,
4752         };
4753         int status;
4754
4755         dprintk("%s: start\n", __func__);
4756
4757         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4758          * is not supported */
4759         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4760                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4761         else
4762                 bitmask[0] |= FATTR4_WORD0_FILEID;
4763
4764         nfs_fattr_init(&fs_locations->fattr);
4765         fs_locations->server = server;
4766         fs_locations->nlocations = 0;
4767         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4768         dprintk("%s: returned status = %d\n", __func__, status);
4769         return status;
4770 }
4771
4772 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4773 {
4774         int status;
4775         struct nfs4_secinfo_arg args = {
4776                 .dir_fh = NFS_FH(dir),
4777                 .name   = name,
4778         };
4779         struct nfs4_secinfo_res res = {
4780                 .flavors     = flavors,
4781         };
4782         struct rpc_message msg = {
4783                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4784                 .rpc_argp = &args,
4785                 .rpc_resp = &res,
4786         };
4787
4788         dprintk("NFS call  secinfo %s\n", name->name);
4789         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4790         dprintk("NFS reply  secinfo: %d\n", status);
4791         return status;
4792 }
4793
4794 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4795 {
4796         struct nfs4_exception exception = { };
4797         int err;
4798         do {
4799                 err = nfs4_handle_exception(NFS_SERVER(dir),
4800                                 _nfs4_proc_secinfo(dir, name, flavors),
4801                                 &exception);
4802         } while (exception.retry);
4803         return err;
4804 }
4805
4806 #ifdef CONFIG_NFS_V4_1
4807 /*
4808  * Check the exchange flags returned by the server for invalid flags, having
4809  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4810  * DS flags set.
4811  */
4812 static int nfs4_check_cl_exchange_flags(u32 flags)
4813 {
4814         if (flags & ~EXCHGID4_FLAG_MASK_R)
4815                 goto out_inval;
4816         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4817             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4818                 goto out_inval;
4819         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4820                 goto out_inval;
4821         return NFS_OK;
4822 out_inval:
4823         return -NFS4ERR_INVAL;
4824 }
4825
4826 static bool
4827 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4828 {
4829         if (a->server_scope_sz == b->server_scope_sz &&
4830             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4831                 return true;
4832
4833         return false;
4834 }
4835
4836 /*
4837  * nfs4_proc_exchange_id()
4838  *
4839  * Since the clientid has expired, all compounds using sessions
4840  * associated with the stale clientid will be returning
4841  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4842  * be in some phase of session reset.
4843  */
4844 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4845 {
4846         nfs4_verifier verifier;
4847         struct nfs41_exchange_id_args args = {
4848                 .client = clp,
4849                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4850         };
4851         struct nfs41_exchange_id_res res = {
4852                 .client = clp,
4853         };
4854         int status;
4855         struct rpc_message msg = {
4856                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4857                 .rpc_argp = &args,
4858                 .rpc_resp = &res,
4859                 .rpc_cred = cred,
4860         };
4861         __be32 *p;
4862
4863         dprintk("--> %s\n", __func__);
4864         BUG_ON(clp == NULL);
4865
4866         p = (u32 *)verifier.data;
4867         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4868         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4869         args.verifier = &verifier;
4870
4871         args.id_len = scnprintf(args.id, sizeof(args.id),
4872                                 "%s/%s.%s/%u",
4873                                 clp->cl_ipaddr,
4874                                 init_utsname()->nodename,
4875                                 init_utsname()->domainname,
4876                                 clp->cl_rpcclient->cl_auth->au_flavor);
4877
4878         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4879         if (unlikely(!res.server_scope)) {
4880                 status = -ENOMEM;
4881                 goto out;
4882         }
4883
4884         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4885         if (!status)
4886                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4887
4888         if (!status) {
4889                 if (clp->server_scope &&
4890                     !nfs41_same_server_scope(clp->server_scope,
4891                                              res.server_scope)) {
4892                         dprintk("%s: server_scope mismatch detected\n",
4893                                 __func__);
4894                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4895                         kfree(clp->server_scope);
4896                         clp->server_scope = NULL;
4897                 }
4898
4899                 if (!clp->server_scope) {
4900                         clp->server_scope = res.server_scope;
4901                         goto out;
4902                 }
4903         }
4904         kfree(res.server_scope);
4905 out:
4906         dprintk("<-- %s status= %d\n", __func__, status);
4907         return status;
4908 }
4909
4910 struct nfs4_get_lease_time_data {
4911         struct nfs4_get_lease_time_args *args;
4912         struct nfs4_get_lease_time_res *res;
4913         struct nfs_client *clp;
4914 };
4915
4916 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4917                                         void *calldata)
4918 {
4919         int ret;
4920         struct nfs4_get_lease_time_data *data =
4921                         (struct nfs4_get_lease_time_data *)calldata;
4922
4923         dprintk("--> %s\n", __func__);
4924         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4925         /* just setup sequence, do not trigger session recovery
4926            since we're invoked within one */
4927         ret = nfs41_setup_sequence(data->clp->cl_session,
4928                                    &data->args->la_seq_args,
4929                                    &data->res->lr_seq_res, 0, task);
4930
4931         BUG_ON(ret == -EAGAIN);
4932         rpc_call_start(task);
4933         dprintk("<-- %s\n", __func__);
4934 }
4935
4936 /*
4937  * Called from nfs4_state_manager thread for session setup, so don't recover
4938  * from sequence operation or clientid errors.
4939  */
4940 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4941 {
4942         struct nfs4_get_lease_time_data *data =
4943                         (struct nfs4_get_lease_time_data *)calldata;
4944
4945         dprintk("--> %s\n", __func__);
4946         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4947                 return;
4948         switch (task->tk_status) {
4949         case -NFS4ERR_DELAY:
4950         case -NFS4ERR_GRACE:
4951                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4952                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4953                 task->tk_status = 0;
4954                 /* fall through */
4955         case -NFS4ERR_RETRY_UNCACHED_REP:
4956                 rpc_restart_call_prepare(task);
4957                 return;
4958         }
4959         dprintk("<-- %s\n", __func__);
4960 }
4961
4962 struct rpc_call_ops nfs4_get_lease_time_ops = {
4963         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4964         .rpc_call_done = nfs4_get_lease_time_done,
4965 };
4966
4967 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4968 {
4969         struct rpc_task *task;
4970         struct nfs4_get_lease_time_args args;
4971         struct nfs4_get_lease_time_res res = {
4972                 .lr_fsinfo = fsinfo,
4973         };
4974         struct nfs4_get_lease_time_data data = {
4975                 .args = &args,
4976                 .res = &res,
4977                 .clp = clp,
4978         };
4979         struct rpc_message msg = {
4980                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4981                 .rpc_argp = &args,
4982                 .rpc_resp = &res,
4983         };
4984         struct rpc_task_setup task_setup = {
4985                 .rpc_client = clp->cl_rpcclient,
4986                 .rpc_message = &msg,
4987                 .callback_ops = &nfs4_get_lease_time_ops,
4988                 .callback_data = &data,
4989                 .flags = RPC_TASK_TIMEOUT,
4990         };
4991         int status;
4992
4993         dprintk("--> %s\n", __func__);
4994         task = rpc_run_task(&task_setup);
4995
4996         if (IS_ERR(task))
4997                 status = PTR_ERR(task);
4998         else {
4999                 status = task->tk_status;
5000                 rpc_put_task(task);
5001         }
5002         dprintk("<-- %s return %d\n", __func__, status);
5003
5004         return status;
5005 }
5006
5007 /*
5008  * Reset a slot table
5009  */
5010 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5011                                  int ivalue)
5012 {
5013         struct nfs4_slot *new = NULL;
5014         int i;
5015         int ret = 0;
5016
5017         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5018                 max_reqs, tbl->max_slots);
5019
5020         /* Does the newly negotiated max_reqs match the existing slot table? */
5021         if (max_reqs != tbl->max_slots) {
5022                 ret = -ENOMEM;
5023                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5024                               GFP_NOFS);
5025                 if (!new)
5026                         goto out;
5027                 ret = 0;
5028                 kfree(tbl->slots);
5029         }
5030         spin_lock(&tbl->slot_tbl_lock);
5031         if (new) {
5032                 tbl->slots = new;
5033                 tbl->max_slots = max_reqs;
5034         }
5035         for (i = 0; i < tbl->max_slots; ++i)
5036                 tbl->slots[i].seq_nr = ivalue;
5037         spin_unlock(&tbl->slot_tbl_lock);
5038         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5039                 tbl, tbl->slots, tbl->max_slots);
5040 out:
5041         dprintk("<-- %s: return %d\n", __func__, ret);
5042         return ret;
5043 }
5044
5045 /*
5046  * Reset the forechannel and backchannel slot tables
5047  */
5048 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5049 {
5050         int status;
5051
5052         status = nfs4_reset_slot_table(&session->fc_slot_table,
5053                         session->fc_attrs.max_reqs, 1);
5054         if (status)
5055                 return status;
5056
5057         status = nfs4_reset_slot_table(&session->bc_slot_table,
5058                         session->bc_attrs.max_reqs, 0);
5059         return status;
5060 }
5061
5062 /* Destroy the slot table */
5063 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5064 {
5065         if (session->fc_slot_table.slots != NULL) {
5066                 kfree(session->fc_slot_table.slots);
5067                 session->fc_slot_table.slots = NULL;
5068         }
5069         if (session->bc_slot_table.slots != NULL) {
5070                 kfree(session->bc_slot_table.slots);
5071                 session->bc_slot_table.slots = NULL;
5072         }
5073         return;
5074 }
5075
5076 /*
5077  * Initialize slot table
5078  */
5079 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5080                 int max_slots, int ivalue)
5081 {
5082         struct nfs4_slot *slot;
5083         int ret = -ENOMEM;
5084
5085         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5086
5087         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5088
5089         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5090         if (!slot)
5091                 goto out;
5092         ret = 0;
5093
5094         spin_lock(&tbl->slot_tbl_lock);
5095         tbl->max_slots = max_slots;
5096         tbl->slots = slot;
5097         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5098         spin_unlock(&tbl->slot_tbl_lock);
5099         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5100                 tbl, tbl->slots, tbl->max_slots);
5101 out:
5102         dprintk("<-- %s: return %d\n", __func__, ret);
5103         return ret;
5104 }
5105
5106 /*
5107  * Initialize the forechannel and backchannel tables
5108  */
5109 static int nfs4_init_slot_tables(struct nfs4_session *session)
5110 {
5111         struct nfs4_slot_table *tbl;
5112         int status = 0;
5113
5114         tbl = &session->fc_slot_table;
5115         if (tbl->slots == NULL) {
5116                 status = nfs4_init_slot_table(tbl,
5117                                 session->fc_attrs.max_reqs, 1);
5118                 if (status)
5119                         return status;
5120         }
5121
5122         tbl = &session->bc_slot_table;
5123         if (tbl->slots == NULL) {
5124                 status = nfs4_init_slot_table(tbl,
5125                                 session->bc_attrs.max_reqs, 0);
5126                 if (status)
5127                         nfs4_destroy_slot_tables(session);
5128         }
5129
5130         return status;
5131 }
5132
5133 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5134 {
5135         struct nfs4_session *session;
5136         struct nfs4_slot_table *tbl;
5137
5138         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5139         if (!session)
5140                 return NULL;
5141
5142         tbl = &session->fc_slot_table;
5143         tbl->highest_used_slotid = -1;
5144         spin_lock_init(&tbl->slot_tbl_lock);
5145         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5146         init_completion(&tbl->complete);
5147
5148         tbl = &session->bc_slot_table;
5149         tbl->highest_used_slotid = -1;
5150         spin_lock_init(&tbl->slot_tbl_lock);
5151         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5152         init_completion(&tbl->complete);
5153
5154         session->session_state = 1<<NFS4_SESSION_INITING;
5155
5156         session->clp = clp;
5157         return session;
5158 }
5159
5160 void nfs4_destroy_session(struct nfs4_session *session)
5161 {
5162         nfs4_proc_destroy_session(session);
5163         dprintk("%s Destroy backchannel for xprt %p\n",
5164                 __func__, session->clp->cl_rpcclient->cl_xprt);
5165         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5166                                 NFS41_BC_MIN_CALLBACKS);
5167         nfs4_destroy_slot_tables(session);
5168         kfree(session);
5169 }
5170
5171 /*
5172  * Initialize the values to be used by the client in CREATE_SESSION
5173  * If nfs4_init_session set the fore channel request and response sizes,
5174  * use them.
5175  *
5176  * Set the back channel max_resp_sz_cached to zero to force the client to
5177  * always set csa_cachethis to FALSE because the current implementation
5178  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5179  */
5180 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5181 {
5182         struct nfs4_session *session = args->client->cl_session;
5183         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5184                      mxresp_sz = session->fc_attrs.max_resp_sz;
5185
5186         if (mxrqst_sz == 0)
5187                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5188         if (mxresp_sz == 0)
5189                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5190         /* Fore channel attributes */
5191         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5192         args->fc_attrs.max_resp_sz = mxresp_sz;
5193         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5194         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5195
5196         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5197                 "max_ops=%u max_reqs=%u\n",
5198                 __func__,
5199                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5200                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5201
5202         /* Back channel attributes */
5203         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5204         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5205         args->bc_attrs.max_resp_sz_cached = 0;
5206         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5207         args->bc_attrs.max_reqs = 1;
5208
5209         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5210                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5211                 __func__,
5212                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5213                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5214                 args->bc_attrs.max_reqs);
5215 }
5216
5217 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5218 {
5219         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5220         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5221
5222         if (rcvd->max_resp_sz > sent->max_resp_sz)
5223                 return -EINVAL;
5224         /*
5225          * Our requested max_ops is the minimum we need; we're not
5226          * prepared to break up compounds into smaller pieces than that.
5227          * So, no point even trying to continue if the server won't
5228          * cooperate:
5229          */
5230         if (rcvd->max_ops < sent->max_ops)
5231                 return -EINVAL;
5232         if (rcvd->max_reqs == 0)
5233                 return -EINVAL;
5234         return 0;
5235 }
5236
5237 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5238 {
5239         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5240         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5241
5242         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5243                 return -EINVAL;
5244         if (rcvd->max_resp_sz < sent->max_resp_sz)
5245                 return -EINVAL;
5246         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5247                 return -EINVAL;
5248         /* These would render the backchannel useless: */
5249         if (rcvd->max_ops  == 0)
5250                 return -EINVAL;
5251         if (rcvd->max_reqs == 0)
5252                 return -EINVAL;
5253         return 0;
5254 }
5255
5256 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5257                                      struct nfs4_session *session)
5258 {
5259         int ret;
5260
5261         ret = nfs4_verify_fore_channel_attrs(args, session);
5262         if (ret)
5263                 return ret;
5264         return nfs4_verify_back_channel_attrs(args, session);
5265 }
5266
5267 static int _nfs4_proc_create_session(struct nfs_client *clp)
5268 {
5269         struct nfs4_session *session = clp->cl_session;
5270         struct nfs41_create_session_args args = {
5271                 .client = clp,
5272                 .cb_program = NFS4_CALLBACK,
5273         };
5274         struct nfs41_create_session_res res = {
5275                 .client = clp,
5276         };
5277         struct rpc_message msg = {
5278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5279                 .rpc_argp = &args,
5280                 .rpc_resp = &res,
5281         };
5282         int status;
5283
5284         nfs4_init_channel_attrs(&args);
5285         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5286
5287         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5288
5289         if (!status)
5290                 /* Verify the session's negotiated channel_attrs values */
5291                 status = nfs4_verify_channel_attrs(&args, session);
5292         if (!status) {
5293                 /* Increment the clientid slot sequence id */
5294                 clp->cl_seqid++;
5295         }
5296
5297         return status;
5298 }
5299
5300 /*
5301  * Issues a CREATE_SESSION operation to the server.
5302  * It is the responsibility of the caller to verify the session is
5303  * expired before calling this routine.
5304  */
5305 int nfs4_proc_create_session(struct nfs_client *clp)
5306 {
5307         int status;
5308         unsigned *ptr;
5309         struct nfs4_session *session = clp->cl_session;
5310
5311         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5312
5313         status = _nfs4_proc_create_session(clp);
5314         if (status)
5315                 goto out;
5316
5317         /* Init and reset the fore channel */
5318         status = nfs4_init_slot_tables(session);
5319         dprintk("slot table initialization returned %d\n", status);
5320         if (status)
5321                 goto out;
5322         status = nfs4_reset_slot_tables(session);
5323         dprintk("slot table reset returned %d\n", status);
5324         if (status)
5325                 goto out;
5326
5327         ptr = (unsigned *)&session->sess_id.data[0];
5328         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5329                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5330 out:
5331         dprintk("<-- %s\n", __func__);
5332         return status;
5333 }
5334
5335 /*
5336  * Issue the over-the-wire RPC DESTROY_SESSION.
5337  * The caller must serialize access to this routine.
5338  */
5339 int nfs4_proc_destroy_session(struct nfs4_session *session)
5340 {
5341         int status = 0;
5342         struct rpc_message msg;
5343
5344         dprintk("--> nfs4_proc_destroy_session\n");
5345
5346         /* session is still being setup */
5347         if (session->clp->cl_cons_state != NFS_CS_READY)
5348                 return status;
5349
5350         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5351         msg.rpc_argp = session;
5352         msg.rpc_resp = NULL;
5353         msg.rpc_cred = NULL;
5354         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5355
5356         if (status)
5357                 printk(KERN_WARNING
5358                         "Got error %d from the server on DESTROY_SESSION. "
5359                         "Session has been destroyed regardless...\n", status);
5360
5361         dprintk("<-- nfs4_proc_destroy_session\n");
5362         return status;
5363 }
5364
5365 int nfs4_init_session(struct nfs_server *server)
5366 {
5367         struct nfs_client *clp = server->nfs_client;
5368         struct nfs4_session *session;
5369         unsigned int rsize, wsize;
5370         int ret;
5371
5372         if (!nfs4_has_session(clp))
5373                 return 0;
5374
5375         session = clp->cl_session;
5376         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5377                 return 0;
5378
5379         rsize = server->rsize;
5380         if (rsize == 0)
5381                 rsize = NFS_MAX_FILE_IO_SIZE;
5382         wsize = server->wsize;
5383         if (wsize == 0)
5384                 wsize = NFS_MAX_FILE_IO_SIZE;
5385
5386         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5387         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5388
5389         ret = nfs4_recover_expired_lease(server);
5390         if (!ret)
5391                 ret = nfs4_check_client_ready(clp);
5392         return ret;
5393 }
5394
5395 int nfs4_init_ds_session(struct nfs_client *clp)
5396 {
5397         struct nfs4_session *session = clp->cl_session;
5398         int ret;
5399
5400         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5401                 return 0;
5402
5403         ret = nfs4_client_recover_expired_lease(clp);
5404         if (!ret)
5405                 /* Test for the DS role */
5406                 if (!is_ds_client(clp))
5407                         ret = -ENODEV;
5408         if (!ret)
5409                 ret = nfs4_check_client_ready(clp);
5410         return ret;
5411
5412 }
5413 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5414
5415
5416 /*
5417  * Renew the cl_session lease.
5418  */
5419 struct nfs4_sequence_data {
5420         struct nfs_client *clp;
5421         struct nfs4_sequence_args args;
5422         struct nfs4_sequence_res res;
5423 };
5424
5425 static void nfs41_sequence_release(void *data)
5426 {
5427         struct nfs4_sequence_data *calldata = data;
5428         struct nfs_client *clp = calldata->clp;
5429
5430         if (atomic_read(&clp->cl_count) > 1)
5431                 nfs4_schedule_state_renewal(clp);
5432         nfs_put_client(clp);
5433         kfree(calldata);
5434 }
5435
5436 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5437 {
5438         switch(task->tk_status) {
5439         case -NFS4ERR_DELAY:
5440                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5441                 return -EAGAIN;
5442         default:
5443                 nfs4_schedule_lease_recovery(clp);
5444         }
5445         return 0;
5446 }
5447
5448 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5449 {
5450         struct nfs4_sequence_data *calldata = data;
5451         struct nfs_client *clp = calldata->clp;
5452
5453         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5454                 return;
5455
5456         if (task->tk_status < 0) {
5457                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5458                 if (atomic_read(&clp->cl_count) == 1)
5459                         goto out;
5460
5461                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5462                         rpc_restart_call_prepare(task);
5463                         return;
5464                 }
5465         }
5466         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5467 out:
5468         dprintk("<-- %s\n", __func__);
5469 }
5470
5471 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5472 {
5473         struct nfs4_sequence_data *calldata = data;
5474         struct nfs_client *clp = calldata->clp;
5475         struct nfs4_sequence_args *args;
5476         struct nfs4_sequence_res *res;
5477
5478         args = task->tk_msg.rpc_argp;
5479         res = task->tk_msg.rpc_resp;
5480
5481         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5482                 return;
5483         rpc_call_start(task);
5484 }
5485
5486 static const struct rpc_call_ops nfs41_sequence_ops = {
5487         .rpc_call_done = nfs41_sequence_call_done,
5488         .rpc_call_prepare = nfs41_sequence_prepare,
5489         .rpc_release = nfs41_sequence_release,
5490 };
5491
5492 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5493 {
5494         struct nfs4_sequence_data *calldata;
5495         struct rpc_message msg = {
5496                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5497                 .rpc_cred = cred,
5498         };
5499         struct rpc_task_setup task_setup_data = {
5500                 .rpc_client = clp->cl_rpcclient,
5501                 .rpc_message = &msg,
5502                 .callback_ops = &nfs41_sequence_ops,
5503                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5504         };
5505
5506         if (!atomic_inc_not_zero(&clp->cl_count))
5507                 return ERR_PTR(-EIO);
5508         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5509         if (calldata == NULL) {
5510                 nfs_put_client(clp);
5511                 return ERR_PTR(-ENOMEM);
5512         }
5513         msg.rpc_argp = &calldata->args;
5514         msg.rpc_resp = &calldata->res;
5515         calldata->clp = clp;
5516         task_setup_data.callback_data = calldata;
5517
5518         return rpc_run_task(&task_setup_data);
5519 }
5520
5521 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5522 {
5523         struct rpc_task *task;
5524         int ret = 0;
5525
5526         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5527                 return 0;
5528         task = _nfs41_proc_sequence(clp, cred);
5529         if (IS_ERR(task))
5530                 ret = PTR_ERR(task);
5531         else
5532                 rpc_put_task_async(task);
5533         dprintk("<-- %s status=%d\n", __func__, ret);
5534         return ret;
5535 }
5536
5537 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5538 {
5539         struct rpc_task *task;
5540         int ret;
5541
5542         task = _nfs41_proc_sequence(clp, cred);
5543         if (IS_ERR(task)) {
5544                 ret = PTR_ERR(task);
5545                 goto out;
5546         }
5547         ret = rpc_wait_for_completion_task(task);
5548         if (!ret) {
5549                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5550
5551                 if (task->tk_status == 0)
5552                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5553                 ret = task->tk_status;
5554         }
5555         rpc_put_task(task);
5556 out:
5557         dprintk("<-- %s status=%d\n", __func__, ret);
5558         return ret;
5559 }
5560
5561 struct nfs4_reclaim_complete_data {
5562         struct nfs_client *clp;
5563         struct nfs41_reclaim_complete_args arg;
5564         struct nfs41_reclaim_complete_res res;
5565 };
5566
5567 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5568 {
5569         struct nfs4_reclaim_complete_data *calldata = data;
5570
5571         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5572         if (nfs41_setup_sequence(calldata->clp->cl_session,
5573                                 &calldata->arg.seq_args,
5574                                 &calldata->res.seq_res, 0, task))
5575                 return;
5576
5577         rpc_call_start(task);
5578 }
5579
5580 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5581 {
5582         switch(task->tk_status) {
5583         case 0:
5584         case -NFS4ERR_COMPLETE_ALREADY:
5585         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5586                 break;
5587         case -NFS4ERR_DELAY:
5588                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5589                 /* fall through */
5590         case -NFS4ERR_RETRY_UNCACHED_REP:
5591                 return -EAGAIN;
5592         default:
5593                 nfs4_schedule_lease_recovery(clp);
5594         }
5595         return 0;
5596 }
5597
5598 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5599 {
5600         struct nfs4_reclaim_complete_data *calldata = data;
5601         struct nfs_client *clp = calldata->clp;
5602         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5603
5604         dprintk("--> %s\n", __func__);
5605         if (!nfs41_sequence_done(task, res))
5606                 return;
5607
5608         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5609                 rpc_restart_call_prepare(task);
5610                 return;
5611         }
5612         dprintk("<-- %s\n", __func__);
5613 }
5614
5615 static void nfs4_free_reclaim_complete_data(void *data)
5616 {
5617         struct nfs4_reclaim_complete_data *calldata = data;
5618
5619         kfree(calldata);
5620 }
5621
5622 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5623         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5624         .rpc_call_done = nfs4_reclaim_complete_done,
5625         .rpc_release = nfs4_free_reclaim_complete_data,
5626 };
5627
5628 /*
5629  * Issue a global reclaim complete.
5630  */
5631 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5632 {
5633         struct nfs4_reclaim_complete_data *calldata;
5634         struct rpc_task *task;
5635         struct rpc_message msg = {
5636                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5637         };
5638         struct rpc_task_setup task_setup_data = {
5639                 .rpc_client = clp->cl_rpcclient,
5640                 .rpc_message = &msg,
5641                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5642                 .flags = RPC_TASK_ASYNC,
5643         };
5644         int status = -ENOMEM;
5645
5646         dprintk("--> %s\n", __func__);
5647         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5648         if (calldata == NULL)
5649                 goto out;
5650         calldata->clp = clp;
5651         calldata->arg.one_fs = 0;
5652
5653         msg.rpc_argp = &calldata->arg;
5654         msg.rpc_resp = &calldata->res;
5655         task_setup_data.callback_data = calldata;
5656         task = rpc_run_task(&task_setup_data);
5657         if (IS_ERR(task)) {
5658                 status = PTR_ERR(task);
5659                 goto out;
5660         }
5661         status = nfs4_wait_for_completion_rpc_task(task);
5662         if (status == 0)
5663                 status = task->tk_status;
5664         rpc_put_task(task);
5665         return 0;
5666 out:
5667         dprintk("<-- %s status=%d\n", __func__, status);
5668         return status;
5669 }
5670
5671 static void
5672 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5673 {
5674         struct nfs4_layoutget *lgp = calldata;
5675         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5676
5677         dprintk("--> %s\n", __func__);
5678         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5679          * right now covering the LAYOUTGET we are about to send.
5680          * However, that is not so catastrophic, and there seems
5681          * to be no way to prevent it completely.
5682          */
5683         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5684                                 &lgp->res.seq_res, 0, task))
5685                 return;
5686         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5687                                           NFS_I(lgp->args.inode)->layout,
5688                                           lgp->args.ctx->state)) {
5689                 rpc_exit(task, NFS4_OK);
5690                 return;
5691         }
5692         rpc_call_start(task);
5693 }
5694
5695 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5696 {
5697         struct nfs4_layoutget *lgp = calldata;
5698         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5699
5700         dprintk("--> %s\n", __func__);
5701
5702         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5703                 return;
5704
5705         switch (task->tk_status) {
5706         case 0:
5707                 break;
5708         case -NFS4ERR_LAYOUTTRYLATER:
5709         case -NFS4ERR_RECALLCONFLICT:
5710                 task->tk_status = -NFS4ERR_DELAY;
5711                 /* Fall through */
5712         default:
5713                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5714                         rpc_restart_call_prepare(task);
5715                         return;
5716                 }
5717         }
5718         dprintk("<-- %s\n", __func__);
5719 }
5720
5721 static void nfs4_layoutget_release(void *calldata)
5722 {
5723         struct nfs4_layoutget *lgp = calldata;
5724
5725         dprintk("--> %s\n", __func__);
5726         put_nfs_open_context(lgp->args.ctx);
5727         kfree(calldata);
5728         dprintk("<-- %s\n", __func__);
5729 }
5730
5731 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5732         .rpc_call_prepare = nfs4_layoutget_prepare,
5733         .rpc_call_done = nfs4_layoutget_done,
5734         .rpc_release = nfs4_layoutget_release,
5735 };
5736
5737 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5738 {
5739         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5740         struct rpc_task *task;
5741         struct rpc_message msg = {
5742                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5743                 .rpc_argp = &lgp->args,
5744                 .rpc_resp = &lgp->res,
5745         };
5746         struct rpc_task_setup task_setup_data = {
5747                 .rpc_client = server->client,
5748                 .rpc_message = &msg,
5749                 .callback_ops = &nfs4_layoutget_call_ops,
5750                 .callback_data = lgp,
5751                 .flags = RPC_TASK_ASYNC,
5752         };
5753         int status = 0;
5754
5755         dprintk("--> %s\n", __func__);
5756
5757         lgp->res.layoutp = &lgp->args.layout;
5758         lgp->res.seq_res.sr_slot = NULL;
5759         task = rpc_run_task(&task_setup_data);
5760         if (IS_ERR(task))
5761                 return PTR_ERR(task);
5762         status = nfs4_wait_for_completion_rpc_task(task);
5763         if (status == 0)
5764                 status = task->tk_status;
5765         if (status == 0)
5766                 status = pnfs_layout_process(lgp);
5767         rpc_put_task(task);
5768         dprintk("<-- %s status=%d\n", __func__, status);
5769         return status;
5770 }
5771
5772 static void
5773 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5774 {
5775         struct nfs4_layoutreturn *lrp = calldata;
5776
5777         dprintk("--> %s\n", __func__);
5778         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5779                                 &lrp->res.seq_res, 0, task))
5780                 return;
5781         rpc_call_start(task);
5782 }
5783
5784 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5785 {
5786         struct nfs4_layoutreturn *lrp = calldata;
5787         struct nfs_server *server;
5788         struct pnfs_layout_hdr *lo = lrp->args.layout;
5789
5790         dprintk("--> %s\n", __func__);
5791
5792         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5793                 return;
5794
5795         server = NFS_SERVER(lrp->args.inode);
5796         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5797                 rpc_restart_call_prepare(task);
5798                 return;
5799         }
5800         spin_lock(&lo->plh_inode->i_lock);
5801         if (task->tk_status == 0) {
5802                 if (lrp->res.lrs_present) {
5803                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5804                 } else
5805                         BUG_ON(!list_empty(&lo->plh_segs));
5806         }
5807         lo->plh_block_lgets--;
5808         spin_unlock(&lo->plh_inode->i_lock);
5809         dprintk("<-- %s\n", __func__);
5810 }
5811
5812 static void nfs4_layoutreturn_release(void *calldata)
5813 {
5814         struct nfs4_layoutreturn *lrp = calldata;
5815
5816         dprintk("--> %s\n", __func__);
5817         put_layout_hdr(lrp->args.layout);
5818         kfree(calldata);
5819         dprintk("<-- %s\n", __func__);
5820 }
5821
5822 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5823         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5824         .rpc_call_done = nfs4_layoutreturn_done,
5825         .rpc_release = nfs4_layoutreturn_release,
5826 };
5827
5828 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5829 {
5830         struct rpc_task *task;
5831         struct rpc_message msg = {
5832                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5833                 .rpc_argp = &lrp->args,
5834                 .rpc_resp = &lrp->res,
5835         };
5836         struct rpc_task_setup task_setup_data = {
5837                 .rpc_client = lrp->clp->cl_rpcclient,
5838                 .rpc_message = &msg,
5839                 .callback_ops = &nfs4_layoutreturn_call_ops,
5840                 .callback_data = lrp,
5841         };
5842         int status;
5843
5844         dprintk("--> %s\n", __func__);
5845         task = rpc_run_task(&task_setup_data);
5846         if (IS_ERR(task))
5847                 return PTR_ERR(task);
5848         status = task->tk_status;
5849         dprintk("<-- %s status=%d\n", __func__, status);
5850         rpc_put_task(task);
5851         return status;
5852 }
5853
5854 /*
5855  * Retrieve the list of Data Server devices from the MDS.
5856  */
5857 static int _nfs4_getdevicelist(struct nfs_server *server,
5858                                     const struct nfs_fh *fh,
5859                                     struct pnfs_devicelist *devlist)
5860 {
5861         struct nfs4_getdevicelist_args args = {
5862                 .fh = fh,
5863                 .layoutclass = server->pnfs_curr_ld->id,
5864         };
5865         struct nfs4_getdevicelist_res res = {
5866                 .devlist = devlist,
5867         };
5868         struct rpc_message msg = {
5869                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5870                 .rpc_argp = &args,
5871                 .rpc_resp = &res,
5872         };
5873         int status;
5874
5875         dprintk("--> %s\n", __func__);
5876         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5877                                 &res.seq_res, 0);
5878         dprintk("<-- %s status=%d\n", __func__, status);
5879         return status;
5880 }
5881
5882 int nfs4_proc_getdevicelist(struct nfs_server *server,
5883                             const struct nfs_fh *fh,
5884                             struct pnfs_devicelist *devlist)
5885 {
5886         struct nfs4_exception exception = { };
5887         int err;
5888
5889         do {
5890                 err = nfs4_handle_exception(server,
5891                                 _nfs4_getdevicelist(server, fh, devlist),
5892                                 &exception);
5893         } while (exception.retry);
5894
5895         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5896                 err, devlist->num_devs);
5897
5898         return err;
5899 }
5900 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5901
5902 static int
5903 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5904 {
5905         struct nfs4_getdeviceinfo_args args = {
5906                 .pdev = pdev,
5907         };
5908         struct nfs4_getdeviceinfo_res res = {
5909                 .pdev = pdev,
5910         };
5911         struct rpc_message msg = {
5912                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5913                 .rpc_argp = &args,
5914                 .rpc_resp = &res,
5915         };
5916         int status;
5917
5918         dprintk("--> %s\n", __func__);
5919         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5920         dprintk("<-- %s status=%d\n", __func__, status);
5921
5922         return status;
5923 }
5924
5925 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5926 {
5927         struct nfs4_exception exception = { };
5928         int err;
5929
5930         do {
5931                 err = nfs4_handle_exception(server,
5932                                         _nfs4_proc_getdeviceinfo(server, pdev),
5933                                         &exception);
5934         } while (exception.retry);
5935         return err;
5936 }
5937 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5938
5939 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5940 {
5941         struct nfs4_layoutcommit_data *data = calldata;
5942         struct nfs_server *server = NFS_SERVER(data->args.inode);
5943
5944         if (nfs4_setup_sequence(server, &data->args.seq_args,
5945                                 &data->res.seq_res, 1, task))
5946                 return;
5947         rpc_call_start(task);
5948 }
5949
5950 static void
5951 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5952 {
5953         struct nfs4_layoutcommit_data *data = calldata;
5954         struct nfs_server *server = NFS_SERVER(data->args.inode);
5955
5956         if (!nfs4_sequence_done(task, &data->res.seq_res))
5957                 return;
5958
5959         switch (task->tk_status) { /* Just ignore these failures */
5960         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5961         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5962         case NFS4ERR_BADLAYOUT:     /* no layout */
5963         case NFS4ERR_GRACE:         /* loca_recalim always false */
5964                 task->tk_status = 0;
5965         }
5966
5967         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5968                 rpc_restart_call_prepare(task);
5969                 return;
5970         }
5971
5972         if (task->tk_status == 0)
5973                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5974                                                    data->res.fattr);
5975 }
5976
5977 static void nfs4_layoutcommit_release(void *calldata)
5978 {
5979         struct nfs4_layoutcommit_data *data = calldata;
5980         struct pnfs_layout_segment *lseg, *tmp;
5981         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
5982
5983         pnfs_cleanup_layoutcommit(data);
5984         /* Matched by references in pnfs_set_layoutcommit */
5985         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5986                 list_del_init(&lseg->pls_lc_list);
5987                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
5988                                        &lseg->pls_flags))
5989                         put_lseg(lseg);
5990         }
5991
5992         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
5993         smp_mb__after_clear_bit();
5994         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
5995
5996         put_rpccred(data->cred);
5997         kfree(data);
5998 }
5999
6000 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6001         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6002         .rpc_call_done = nfs4_layoutcommit_done,
6003         .rpc_release = nfs4_layoutcommit_release,
6004 };
6005
6006 int
6007 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6008 {
6009         struct rpc_message msg = {
6010                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6011                 .rpc_argp = &data->args,
6012                 .rpc_resp = &data->res,
6013                 .rpc_cred = data->cred,
6014         };
6015         struct rpc_task_setup task_setup_data = {
6016                 .task = &data->task,
6017                 .rpc_client = NFS_CLIENT(data->args.inode),
6018                 .rpc_message = &msg,
6019                 .callback_ops = &nfs4_layoutcommit_ops,
6020                 .callback_data = data,
6021                 .flags = RPC_TASK_ASYNC,
6022         };
6023         struct rpc_task *task;
6024         int status = 0;
6025
6026         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6027                 "lbw: %llu inode %lu\n",
6028                 data->task.tk_pid, sync,
6029                 data->args.lastbytewritten,
6030                 data->args.inode->i_ino);
6031
6032         task = rpc_run_task(&task_setup_data);
6033         if (IS_ERR(task))
6034                 return PTR_ERR(task);
6035         if (sync == false)
6036                 goto out;
6037         status = nfs4_wait_for_completion_rpc_task(task);
6038         if (status != 0)
6039                 goto out;
6040         status = task->tk_status;
6041 out:
6042         dprintk("%s: status %d\n", __func__, status);
6043         rpc_put_task(task);
6044         return status;
6045 }
6046
6047 static int
6048 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6049                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6050 {
6051         struct nfs41_secinfo_no_name_args args = {
6052                 .style = SECINFO_STYLE_CURRENT_FH,
6053         };
6054         struct nfs4_secinfo_res res = {
6055                 .flavors = flavors,
6056         };
6057         struct rpc_message msg = {
6058                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6059                 .rpc_argp = &args,
6060                 .rpc_resp = &res,
6061         };
6062         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6063 }
6064
6065 static int
6066 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6067                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6068 {
6069         struct nfs4_exception exception = { };
6070         int err;
6071         do {
6072                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6073                 switch (err) {
6074                 case 0:
6075                 case -NFS4ERR_WRONGSEC:
6076                 case -NFS4ERR_NOTSUPP:
6077                         break;
6078                 default:
6079                         err = nfs4_handle_exception(server, err, &exception);
6080                 }
6081         } while (exception.retry);
6082         return err;
6083 }
6084
6085 static int
6086 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6087                     struct nfs_fsinfo *info)
6088 {
6089         int err;
6090         struct page *page;
6091         rpc_authflavor_t flavor;
6092         struct nfs4_secinfo_flavors *flavors;
6093
6094         page = alloc_page(GFP_KERNEL);
6095         if (!page) {
6096                 err = -ENOMEM;
6097                 goto out;
6098         }
6099
6100         flavors = page_address(page);
6101         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6102
6103         /*
6104          * Fall back on "guess and check" method if
6105          * the server doesn't support SECINFO_NO_NAME
6106          */
6107         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6108                 err = nfs4_find_root_sec(server, fhandle, info);
6109                 goto out_freepage;
6110         }
6111         if (err)
6112                 goto out_freepage;
6113
6114         flavor = nfs_find_best_sec(flavors);
6115         if (err == 0)
6116                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6117
6118 out_freepage:
6119         put_page(page);
6120         if (err == -EACCES)
6121                 return -EPERM;
6122 out:
6123         return err;
6124 }
6125 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6126 {
6127         int status;
6128         struct nfs41_test_stateid_args args = {
6129                 .stateid = &state->stateid,
6130         };
6131         struct nfs41_test_stateid_res res;
6132         struct rpc_message msg = {
6133                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6134                 .rpc_argp = &args,
6135                 .rpc_resp = &res,
6136         };
6137         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6138         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6139         return status;
6140 }
6141
6142 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6143 {
6144         struct nfs4_exception exception = { };
6145         int err;
6146         do {
6147                 err = nfs4_handle_exception(server,
6148                                 _nfs41_test_stateid(server, state),
6149                                 &exception);
6150         } while (exception.retry);
6151         return err;
6152 }
6153
6154 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6155 {
6156         int status;
6157         struct nfs41_free_stateid_args args = {
6158                 .stateid = &state->stateid,
6159         };
6160         struct nfs41_free_stateid_res res;
6161         struct rpc_message msg = {
6162                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6163                 .rpc_argp = &args,
6164                 .rpc_resp = &res,
6165         };
6166
6167         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6168         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6169         return status;
6170 }
6171
6172 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6173 {
6174         struct nfs4_exception exception = { };
6175         int err;
6176         do {
6177                 err = nfs4_handle_exception(server,
6178                                 _nfs4_free_stateid(server, state),
6179                                 &exception);
6180         } while (exception.retry);
6181         return err;
6182 }
6183 #endif /* CONFIG_NFS_V4_1 */
6184
6185 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6186         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6187         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6188         .recover_open   = nfs4_open_reclaim,
6189         .recover_lock   = nfs4_lock_reclaim,
6190         .establish_clid = nfs4_init_clientid,
6191         .get_clid_cred  = nfs4_get_setclientid_cred,
6192 };
6193
6194 #if defined(CONFIG_NFS_V4_1)
6195 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6196         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6197         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6198         .recover_open   = nfs4_open_reclaim,
6199         .recover_lock   = nfs4_lock_reclaim,
6200         .establish_clid = nfs41_init_clientid,
6201         .get_clid_cred  = nfs4_get_exchange_id_cred,
6202         .reclaim_complete = nfs41_proc_reclaim_complete,
6203 };
6204 #endif /* CONFIG_NFS_V4_1 */
6205
6206 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6207         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6208         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6209         .recover_open   = nfs4_open_expired,
6210         .recover_lock   = nfs4_lock_expired,
6211         .establish_clid = nfs4_init_clientid,
6212         .get_clid_cred  = nfs4_get_setclientid_cred,
6213 };
6214
6215 #if defined(CONFIG_NFS_V4_1)
6216 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6217         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6218         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6219         .recover_open   = nfs41_open_expired,
6220         .recover_lock   = nfs41_lock_expired,
6221         .establish_clid = nfs41_init_clientid,
6222         .get_clid_cred  = nfs4_get_exchange_id_cred,
6223 };
6224 #endif /* CONFIG_NFS_V4_1 */
6225
6226 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6227         .sched_state_renewal = nfs4_proc_async_renew,
6228         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6229         .renew_lease = nfs4_proc_renew,
6230 };
6231
6232 #if defined(CONFIG_NFS_V4_1)
6233 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6234         .sched_state_renewal = nfs41_proc_async_sequence,
6235         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6236         .renew_lease = nfs4_proc_sequence,
6237 };
6238 #endif
6239
6240 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6241         .minor_version = 0,
6242         .call_sync = _nfs4_call_sync,
6243         .validate_stateid = nfs4_validate_delegation_stateid,
6244         .find_root_sec = nfs4_find_root_sec,
6245         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6246         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6247         .state_renewal_ops = &nfs40_state_renewal_ops,
6248 };
6249
6250 #if defined(CONFIG_NFS_V4_1)
6251 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6252         .minor_version = 1,
6253         .call_sync = _nfs4_call_sync_session,
6254         .validate_stateid = nfs41_validate_delegation_stateid,
6255         .find_root_sec = nfs41_find_root_sec,
6256         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6257         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6258         .state_renewal_ops = &nfs41_state_renewal_ops,
6259 };
6260 #endif
6261
6262 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6263         [0] = &nfs_v4_0_minor_ops,
6264 #if defined(CONFIG_NFS_V4_1)
6265         [1] = &nfs_v4_1_minor_ops,
6266 #endif
6267 };
6268
6269 static const struct inode_operations nfs4_file_inode_operations = {
6270         .permission     = nfs_permission,
6271         .getattr        = nfs_getattr,
6272         .setattr        = nfs_setattr,
6273         .getxattr       = generic_getxattr,
6274         .setxattr       = generic_setxattr,
6275         .listxattr      = generic_listxattr,
6276         .removexattr    = generic_removexattr,
6277 };
6278
6279 const struct nfs_rpc_ops nfs_v4_clientops = {
6280         .version        = 4,                    /* protocol version */
6281         .dentry_ops     = &nfs4_dentry_operations,
6282         .dir_inode_ops  = &nfs4_dir_inode_operations,
6283         .file_inode_ops = &nfs4_file_inode_operations,
6284         .file_ops       = &nfs4_file_operations,
6285         .getroot        = nfs4_proc_get_root,
6286         .getattr        = nfs4_proc_getattr,
6287         .setattr        = nfs4_proc_setattr,
6288         .lookup         = nfs4_proc_lookup,
6289         .access         = nfs4_proc_access,
6290         .readlink       = nfs4_proc_readlink,
6291         .create         = nfs4_proc_create,
6292         .remove         = nfs4_proc_remove,
6293         .unlink_setup   = nfs4_proc_unlink_setup,
6294         .unlink_done    = nfs4_proc_unlink_done,
6295         .rename         = nfs4_proc_rename,
6296         .rename_setup   = nfs4_proc_rename_setup,
6297         .rename_done    = nfs4_proc_rename_done,
6298         .link           = nfs4_proc_link,
6299         .symlink        = nfs4_proc_symlink,
6300         .mkdir          = nfs4_proc_mkdir,
6301         .rmdir          = nfs4_proc_remove,
6302         .readdir        = nfs4_proc_readdir,
6303         .mknod          = nfs4_proc_mknod,
6304         .statfs         = nfs4_proc_statfs,
6305         .fsinfo         = nfs4_proc_fsinfo,
6306         .pathconf       = nfs4_proc_pathconf,
6307         .set_capabilities = nfs4_server_capabilities,
6308         .decode_dirent  = nfs4_decode_dirent,
6309         .read_setup     = nfs4_proc_read_setup,
6310         .read_done      = nfs4_read_done,
6311         .write_setup    = nfs4_proc_write_setup,
6312         .write_done     = nfs4_write_done,
6313         .commit_setup   = nfs4_proc_commit_setup,
6314         .commit_done    = nfs4_commit_done,
6315         .lock           = nfs4_proc_lock,
6316         .clear_acl_cache = nfs4_zap_acl_attr,
6317         .close_context  = nfs4_close_context,
6318         .open_context   = nfs4_atomic_open,
6319         .init_client    = nfs4_init_client,
6320         .secinfo        = nfs4_proc_secinfo,
6321 };
6322
6323 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6324         .prefix = XATTR_NAME_NFSV4_ACL,
6325         .list   = nfs4_xattr_list_nfs4_acl,
6326         .get    = nfs4_xattr_get_nfs4_acl,
6327         .set    = nfs4_xattr_set_nfs4_acl,
6328 };
6329
6330 const struct xattr_handler *nfs4_xattr_handlers[] = {
6331         &nfs4_xattr_nfs4_acl_handler,
6332         NULL
6333 };
6334
6335 /*
6336  * Local variables:
6337  *  c-basic-offset: 8
6338  * End:
6339  */