fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/sunrpc/gss_api.h>
  45 #include <linux/nfs.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/nfs_page.h>
  49 #include <linux/nfs_mount.h>
  50 #include <linux/namei.h>
  51 #include <linux/mount.h>
  52 #include <linux/module.h>
  53 #include <linux/sunrpc/bc_xprt.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "delegation.h"
  59 #include "internal.h"
  60 #include "iostat.h"
  61 #include "callback.h"
  62 #include "pnfs.h"
  63
  64 #define NFSDBG_FACILITY         NFSDBG_PROC
  65
  66 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  67 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  68
  69 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  70
  71 struct nfs4_opendata;
  72 static int _nfs4_proc_open(struct nfs4_opendata *data);
  73 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  74 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  75 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  76 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
  77                              const struct qstr *name, struct nfs_fh *fhandle,
  78                              struct nfs_fattr *fattr);
  79 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  80 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  81                             struct nfs_fattr *fattr, struct iattr *sattr,
  82                             struct nfs4_state *state);
  83 #ifdef CONFIG_NFS_V4_1
  84 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  85 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  86 #endif
  87 /* Prevent leaks of NFSv4 errors into userland */
  88 static int nfs4_map_errors(int err)
  89 {
  90         if (err >= -1000)
  91                 return err;
  92         switch (err) {
  93         case -NFS4ERR_RESOURCE:
  94                 return -EREMOTEIO;
  95         case -NFS4ERR_WRONGSEC:
  96                 return -EPERM;
  97         case -NFS4ERR_BADOWNER:
  98         case -NFS4ERR_BADNAME:
  99                 return -EINVAL;
 100         default:
 101                 dprintk("%s could not handle NFSv4 error %d\n",
 102                                 __func__, -err);
 103                 break;
 104         }
 105         return -EIO;
 106 }
 107
 108 /*
 109  * This is our standard bitmap for GETATTR requests.
 110  */
 111 const u32 nfs4_fattr_bitmap[2] = {
 112         FATTR4_WORD0_TYPE
 113         | FATTR4_WORD0_CHANGE
 114         | FATTR4_WORD0_SIZE
 115         | FATTR4_WORD0_FSID
 116         | FATTR4_WORD0_FILEID,
 117         FATTR4_WORD1_MODE
 118         | FATTR4_WORD1_NUMLINKS
 119         | FATTR4_WORD1_OWNER
 120         | FATTR4_WORD1_OWNER_GROUP
 121         | FATTR4_WORD1_RAWDEV
 122         | FATTR4_WORD1_SPACE_USED
 123         | FATTR4_WORD1_TIME_ACCESS
 124         | FATTR4_WORD1_TIME_METADATA
 125         | FATTR4_WORD1_TIME_MODIFY
 126 };
 127
 128 const u32 nfs4_statfs_bitmap[2] = {
 129         FATTR4_WORD0_FILES_AVAIL
 130         | FATTR4_WORD0_FILES_FREE
 131         | FATTR4_WORD0_FILES_TOTAL,
 132         FATTR4_WORD1_SPACE_AVAIL
 133         | FATTR4_WORD1_SPACE_FREE
 134         | FATTR4_WORD1_SPACE_TOTAL
 135 };
 136
 137 const u32 nfs4_pathconf_bitmap[2] = {
 138         FATTR4_WORD0_MAXLINK
 139         | FATTR4_WORD0_MAXNAME,
 140         0
 141 };
 142
 143 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 144                         | FATTR4_WORD0_MAXREAD
 145                         | FATTR4_WORD0_MAXWRITE
 146                         | FATTR4_WORD0_LEASE_TIME,
 147                         FATTR4_WORD1_TIME_DELTA
 148                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 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 != nfsi->change_attr)
 756                 nfs_force_lookup_revalidate(dir);
 757         nfsi->change_attr = 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->type & fmode) != fmode)
 900                 return 0;
 901         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 902                 return 0;
 903         nfs_mark_delegation_referenced(delegation);
 904         return 1;
 905 }
 906
 907 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 908 {
 909         switch (fmode) {
 910                 case FMODE_WRITE:
 911                         state->n_wronly++;
 912                         break;
 913                 case FMODE_READ:
 914                         state->n_rdonly++;
 915                         break;
 916                 case FMODE_READ|FMODE_WRITE:
 917                         state->n_rdwr++;
 918         }
 919         nfs4_state_set_mode_locked(state, state->state | fmode);
 920 }
 921
 922 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 923 {
 924         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 925                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 926         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 927         switch (fmode) {
 928                 case FMODE_READ:
 929                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 930                         break;
 931                 case FMODE_WRITE:
 932                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 933                         break;
 934                 case FMODE_READ|FMODE_WRITE:
 935                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 936         }
 937 }
 938
 939 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 940 {
 941         write_seqlock(&state->seqlock);
 942         nfs_set_open_stateid_locked(state, stateid, fmode);
 943         write_sequnlock(&state->seqlock);
 944 }
 945
 946 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 947 {
 948         /*
 949          * Protect the call to nfs4_state_set_mode_locked and
 950          * serialise the stateid update
 951          */
 952         write_seqlock(&state->seqlock);
 953         if (deleg_stateid != NULL) {
 954                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 955                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 956         }
 957         if (open_stateid != NULL)
 958                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 959         write_sequnlock(&state->seqlock);
 960         spin_lock(&state->owner->so_lock);
 961         update_open_stateflags(state, fmode);
 962         spin_unlock(&state->owner->so_lock);
 963 }
 964
 965 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 966 {
 967         struct nfs_inode *nfsi = NFS_I(state->inode);
 968         struct nfs_delegation *deleg_cur;
 969         int ret = 0;
 970
 971         fmode &= (FMODE_READ|FMODE_WRITE);
 972
 973         rcu_read_lock();
 974         deleg_cur = rcu_dereference(nfsi->delegation);
 975         if (deleg_cur == NULL)
 976                 goto no_delegation;
 977
 978         spin_lock(&deleg_cur->lock);
 979         if (nfsi->delegation != deleg_cur ||
 980             (deleg_cur->type & fmode) != fmode)
 981                 goto no_delegation_unlock;
 982
 983         if (delegation == NULL)
 984                 delegation = &deleg_cur->stateid;
 985         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 986                 goto no_delegation_unlock;
 987
 988         nfs_mark_delegation_referenced(deleg_cur);
 989         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 990         ret = 1;
 991 no_delegation_unlock:
 992         spin_unlock(&deleg_cur->lock);
 993 no_delegation:
 994         rcu_read_unlock();
 995
 996         if (!ret && open_stateid != NULL) {
 997                 __update_open_stateid(state, open_stateid, NULL, fmode);
 998                 ret = 1;
 999         }
1000
1001         return ret;
1002 }
1003
1004
1005 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1006 {
1007         struct nfs_delegation *delegation;
1008
1009         rcu_read_lock();
1010         delegation = rcu_dereference(NFS_I(inode)->delegation);
1011         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1012                 rcu_read_unlock();
1013                 return;
1014         }
1015         rcu_read_unlock();
1016         nfs_inode_return_delegation(inode);
1017 }
1018
1019 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1020 {
1021         struct nfs4_state *state = opendata->state;
1022         struct nfs_inode *nfsi = NFS_I(state->inode);
1023         struct nfs_delegation *delegation;
1024         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1025         fmode_t fmode = opendata->o_arg.fmode;
1026         nfs4_stateid stateid;
1027         int ret = -EAGAIN;
1028
1029         for (;;) {
1030                 if (can_open_cached(state, fmode, open_mode)) {
1031                         spin_lock(&state->owner->so_lock);
1032                         if (can_open_cached(state, fmode, open_mode)) {
1033                                 update_open_stateflags(state, fmode);
1034                                 spin_unlock(&state->owner->so_lock);
1035                                 goto out_return_state;
1036                         }
1037                         spin_unlock(&state->owner->so_lock);
1038                 }
1039                 rcu_read_lock();
1040                 delegation = rcu_dereference(nfsi->delegation);
1041                 if (delegation == NULL ||
1042                     !can_open_delegated(delegation, fmode)) {
1043                         rcu_read_unlock();
1044                         break;
1045                 }
1046                 /* Save the delegation */
1047                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1048                 rcu_read_unlock();
1049                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1050                 if (ret != 0)
1051                         goto out;
1052                 ret = -EAGAIN;
1053
1054                 /* Try to update the stateid using the delegation */
1055                 if (update_open_stateid(state, NULL, &stateid, fmode))
1056                         goto out_return_state;
1057         }
1058 out:
1059         return ERR_PTR(ret);
1060 out_return_state:
1061         atomic_inc(&state->count);
1062         return state;
1063 }
1064
1065 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1066 {
1067         struct inode *inode;
1068         struct nfs4_state *state = NULL;
1069         struct nfs_delegation *delegation;
1070         int ret;
1071
1072         if (!data->rpc_done) {
1073                 state = nfs4_try_open_cached(data);
1074                 goto out;
1075         }
1076
1077         ret = -EAGAIN;
1078         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1079                 goto err;
1080         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1081         ret = PTR_ERR(inode);
1082         if (IS_ERR(inode))
1083                 goto err;
1084         ret = -ENOMEM;
1085         state = nfs4_get_open_state(inode, data->owner);
1086         if (state == NULL)
1087                 goto err_put_inode;
1088         if (data->o_res.delegation_type != 0) {
1089                 int delegation_flags = 0;
1090
1091                 rcu_read_lock();
1092                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1093                 if (delegation)
1094                         delegation_flags = delegation->flags;
1095                 rcu_read_unlock();
1096                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1097                         nfs_inode_set_delegation(state->inode,
1098                                         data->owner->so_cred,
1099                                         &data->o_res);
1100                 else
1101                         nfs_inode_reclaim_delegation(state->inode,
1102                                         data->owner->so_cred,
1103                                         &data->o_res);
1104         }
1105
1106         update_open_stateid(state, &data->o_res.stateid, NULL,
1107                         data->o_arg.fmode);
1108         iput(inode);
1109 out:
1110         return state;
1111 err_put_inode:
1112         iput(inode);
1113 err:
1114         return ERR_PTR(ret);
1115 }
1116
1117 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1118 {
1119         struct nfs_inode *nfsi = NFS_I(state->inode);
1120         struct nfs_open_context *ctx;
1121
1122         spin_lock(&state->inode->i_lock);
1123         list_for_each_entry(ctx, &nfsi->open_files, list) {
1124                 if (ctx->state != state)
1125                         continue;
1126                 get_nfs_open_context(ctx);
1127                 spin_unlock(&state->inode->i_lock);
1128                 return ctx;
1129         }
1130         spin_unlock(&state->inode->i_lock);
1131         return ERR_PTR(-ENOENT);
1132 }
1133
1134 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1135 {
1136         struct nfs4_opendata *opendata;
1137
1138         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1139         if (opendata == NULL)
1140                 return ERR_PTR(-ENOMEM);
1141         opendata->state = state;
1142         atomic_inc(&state->count);
1143         return opendata;
1144 }
1145
1146 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1147 {
1148         struct nfs4_state *newstate;
1149         int ret;
1150
1151         opendata->o_arg.open_flags = 0;
1152         opendata->o_arg.fmode = fmode;
1153         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1154         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1155         nfs4_init_opendata_res(opendata);
1156         ret = _nfs4_recover_proc_open(opendata);
1157         if (ret != 0)
1158                 return ret;
1159         newstate = nfs4_opendata_to_nfs4_state(opendata);
1160         if (IS_ERR(newstate))
1161                 return PTR_ERR(newstate);
1162         nfs4_close_state(newstate, fmode);
1163         *res = newstate;
1164         return 0;
1165 }
1166
1167 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1168 {
1169         struct nfs4_state *newstate;
1170         int ret;
1171
1172         /* memory barrier prior to reading state->n_* */
1173         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1174         smp_rmb();
1175         if (state->n_rdwr != 0) {
1176                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1177                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1178                 if (ret != 0)
1179                         return ret;
1180                 if (newstate != state)
1181                         return -ESTALE;
1182         }
1183         if (state->n_wronly != 0) {
1184                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1185                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1186                 if (ret != 0)
1187                         return ret;
1188                 if (newstate != state)
1189                         return -ESTALE;
1190         }
1191         if (state->n_rdonly != 0) {
1192                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1193                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1194                 if (ret != 0)
1195                         return ret;
1196                 if (newstate != state)
1197                         return -ESTALE;
1198         }
1199         /*
1200          * We may have performed cached opens for all three recoveries.
1201          * Check if we need to update the current stateid.
1202          */
1203         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1204             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1205                 write_seqlock(&state->seqlock);
1206                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1207                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1208                 write_sequnlock(&state->seqlock);
1209         }
1210         return 0;
1211 }
1212
1213 /*
1214  * OPEN_RECLAIM:
1215  *      reclaim state on the server after a reboot.
1216  */
1217 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1218 {
1219         struct nfs_delegation *delegation;
1220         struct nfs4_opendata *opendata;
1221         fmode_t delegation_type = 0;
1222         int status;
1223
1224         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1225         if (IS_ERR(opendata))
1226                 return PTR_ERR(opendata);
1227         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1228         opendata->o_arg.fh = NFS_FH(state->inode);
1229         rcu_read_lock();
1230         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1231         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1232                 delegation_type = delegation->type;
1233         rcu_read_unlock();
1234         opendata->o_arg.u.delegation_type = delegation_type;
1235         status = nfs4_open_recover(opendata, state);
1236         nfs4_opendata_put(opendata);
1237         return status;
1238 }
1239
1240 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1241 {
1242         struct nfs_server *server = NFS_SERVER(state->inode);
1243         struct nfs4_exception exception = { };
1244         int err;
1245         do {
1246                 err = _nfs4_do_open_reclaim(ctx, state);
1247                 if (err != -NFS4ERR_DELAY)
1248                         break;
1249                 nfs4_handle_exception(server, err, &exception);
1250         } while (exception.retry);
1251         return err;
1252 }
1253
1254 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1255 {
1256         struct nfs_open_context *ctx;
1257         int ret;
1258
1259         ctx = nfs4_state_find_open_context(state);
1260         if (IS_ERR(ctx))
1261                 return PTR_ERR(ctx);
1262         ret = nfs4_do_open_reclaim(ctx, state);
1263         put_nfs_open_context(ctx);
1264         return ret;
1265 }
1266
1267 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1268 {
1269         struct nfs4_opendata *opendata;
1270         int ret;
1271
1272         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1273         if (IS_ERR(opendata))
1274                 return PTR_ERR(opendata);
1275         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1276         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1277                         sizeof(opendata->o_arg.u.delegation.data));
1278         ret = nfs4_open_recover(opendata, state);
1279         nfs4_opendata_put(opendata);
1280         return ret;
1281 }
1282
1283 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1284 {
1285         struct nfs4_exception exception = { };
1286         struct nfs_server *server = NFS_SERVER(state->inode);
1287         int err;
1288         do {
1289                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1290                 switch (err) {
1291                         case 0:
1292                         case -ENOENT:
1293                         case -ESTALE:
1294                                 goto out;
1295                         case -NFS4ERR_BADSESSION:
1296                         case -NFS4ERR_BADSLOT:
1297                         case -NFS4ERR_BAD_HIGH_SLOT:
1298                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1299                         case -NFS4ERR_DEADSESSION:
1300                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1301                                 goto out;
1302                         case -NFS4ERR_STALE_CLIENTID:
1303                         case -NFS4ERR_STALE_STATEID:
1304                         case -NFS4ERR_EXPIRED:
1305                                 /* Don't recall a delegation if it was lost */
1306                                 nfs4_schedule_lease_recovery(server->nfs_client);
1307                                 goto out;
1308                         case -ERESTARTSYS:
1309                                 /*
1310                                  * The show must go on: exit, but mark the
1311                                  * stateid as needing recovery.
1312                                  */
1313                         case -NFS4ERR_ADMIN_REVOKED:
1314                         case -NFS4ERR_BAD_STATEID:
1315                                 nfs4_schedule_stateid_recovery(server, state);
1316                         case -EKEYEXPIRED:
1317                                 /*
1318                                  * User RPCSEC_GSS context has expired.
1319                                  * We cannot recover this stateid now, so
1320                                  * skip it and allow recovery thread to
1321                                  * proceed.
1322                                  */
1323                         case -ENOMEM:
1324                                 err = 0;
1325                                 goto out;
1326                 }
1327                 err = nfs4_handle_exception(server, err, &exception);
1328         } while (exception.retry);
1329 out:
1330         return err;
1331 }
1332
1333 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1334 {
1335         struct nfs4_opendata *data = calldata;
1336
1337         data->rpc_status = task->tk_status;
1338         if (data->rpc_status == 0) {
1339                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1340                                 sizeof(data->o_res.stateid.data));
1341                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1342                 renew_lease(data->o_res.server, data->timestamp);
1343                 data->rpc_done = 1;
1344         }
1345 }
1346
1347 static void nfs4_open_confirm_release(void *calldata)
1348 {
1349         struct nfs4_opendata *data = calldata;
1350         struct nfs4_state *state = NULL;
1351
1352         /* If this request hasn't been cancelled, do nothing */
1353         if (data->cancelled == 0)
1354                 goto out_free;
1355         /* In case of error, no cleanup! */
1356         if (!data->rpc_done)
1357                 goto out_free;
1358         state = nfs4_opendata_to_nfs4_state(data);
1359         if (!IS_ERR(state))
1360                 nfs4_close_state(state, data->o_arg.fmode);
1361 out_free:
1362         nfs4_opendata_put(data);
1363 }
1364
1365 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1366         .rpc_call_done = nfs4_open_confirm_done,
1367         .rpc_release = nfs4_open_confirm_release,
1368 };
1369
1370 /*
1371  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1372  */
1373 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1374 {
1375         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1376         struct rpc_task *task;
1377         struct  rpc_message msg = {
1378                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1379                 .rpc_argp = &data->c_arg,
1380                 .rpc_resp = &data->c_res,
1381                 .rpc_cred = data->owner->so_cred,
1382         };
1383         struct rpc_task_setup task_setup_data = {
1384                 .rpc_client = server->client,
1385                 .rpc_message = &msg,
1386                 .callback_ops = &nfs4_open_confirm_ops,
1387                 .callback_data = data,
1388                 .workqueue = nfsiod_workqueue,
1389                 .flags = RPC_TASK_ASYNC,
1390         };
1391         int status;
1392
1393         kref_get(&data->kref);
1394         data->rpc_done = 0;
1395         data->rpc_status = 0;
1396         data->timestamp = jiffies;
1397         task = rpc_run_task(&task_setup_data);
1398         if (IS_ERR(task))
1399                 return PTR_ERR(task);
1400         status = nfs4_wait_for_completion_rpc_task(task);
1401         if (status != 0) {
1402                 data->cancelled = 1;
1403                 smp_wmb();
1404         } else
1405                 status = data->rpc_status;
1406         rpc_put_task(task);
1407         return status;
1408 }
1409
1410 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1411 {
1412         struct nfs4_opendata *data = calldata;
1413         struct nfs4_state_owner *sp = data->owner;
1414
1415         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1416                 return;
1417         /*
1418          * Check if we still need to send an OPEN call, or if we can use
1419          * a delegation instead.
1420          */
1421         if (data->state != NULL) {
1422                 struct nfs_delegation *delegation;
1423
1424                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1425                         goto out_no_action;
1426                 rcu_read_lock();
1427                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1428                 if (delegation != NULL &&
1429                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1430                         rcu_read_unlock();
1431                         goto out_no_action;
1432                 }
1433                 rcu_read_unlock();
1434         }
1435         /* Update sequence id. */
1436         data->o_arg.id = sp->so_owner_id.id;
1437         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1438         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1439                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1440                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1441         }
1442         data->timestamp = jiffies;
1443         if (nfs4_setup_sequence(data->o_arg.server,
1444                                 &data->o_arg.seq_args,
1445                                 &data->o_res.seq_res, 1, task))
1446                 return;
1447         rpc_call_start(task);
1448         return;
1449 out_no_action:
1450         task->tk_action = NULL;
1451
1452 }
1453
1454 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1455 {
1456         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1457         nfs4_open_prepare(task, calldata);
1458 }
1459
1460 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1461 {
1462         struct nfs4_opendata *data = calldata;
1463
1464         data->rpc_status = task->tk_status;
1465
1466         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1467                 return;
1468
1469         if (task->tk_status == 0) {
1470                 switch (data->o_res.f_attr->mode & S_IFMT) {
1471                         case S_IFREG:
1472                                 break;
1473                         case S_IFLNK:
1474                                 data->rpc_status = -ELOOP;
1475                                 break;
1476                         case S_IFDIR:
1477                                 data->rpc_status = -EISDIR;
1478                                 break;
1479                         default:
1480                                 data->rpc_status = -ENOTDIR;
1481                 }
1482                 renew_lease(data->o_res.server, data->timestamp);
1483                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1484                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1485         }
1486         data->rpc_done = 1;
1487 }
1488
1489 static void nfs4_open_release(void *calldata)
1490 {
1491         struct nfs4_opendata *data = calldata;
1492         struct nfs4_state *state = NULL;
1493
1494         /* If this request hasn't been cancelled, do nothing */
1495         if (data->cancelled == 0)
1496                 goto out_free;
1497         /* In case of error, no cleanup! */
1498         if (data->rpc_status != 0 || !data->rpc_done)
1499                 goto out_free;
1500         /* In case we need an open_confirm, no cleanup! */
1501         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1502                 goto out_free;
1503         state = nfs4_opendata_to_nfs4_state(data);
1504         if (!IS_ERR(state))
1505                 nfs4_close_state(state, data->o_arg.fmode);
1506 out_free:
1507         nfs4_opendata_put(data);
1508 }
1509
1510 static const struct rpc_call_ops nfs4_open_ops = {
1511         .rpc_call_prepare = nfs4_open_prepare,
1512         .rpc_call_done = nfs4_open_done,
1513         .rpc_release = nfs4_open_release,
1514 };
1515
1516 static const struct rpc_call_ops nfs4_recover_open_ops = {
1517         .rpc_call_prepare = nfs4_recover_open_prepare,
1518         .rpc_call_done = nfs4_open_done,
1519         .rpc_release = nfs4_open_release,
1520 };
1521
1522 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1523 {
1524         struct inode *dir = data->dir->d_inode;
1525         struct nfs_server *server = NFS_SERVER(dir);
1526         struct nfs_openargs *o_arg = &data->o_arg;
1527         struct nfs_openres *o_res = &data->o_res;
1528         struct rpc_task *task;
1529         struct rpc_message msg = {
1530                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1531                 .rpc_argp = o_arg,
1532                 .rpc_resp = o_res,
1533                 .rpc_cred = data->owner->so_cred,
1534         };
1535         struct rpc_task_setup task_setup_data = {
1536                 .rpc_client = server->client,
1537                 .rpc_message = &msg,
1538                 .callback_ops = &nfs4_open_ops,
1539                 .callback_data = data,
1540                 .workqueue = nfsiod_workqueue,
1541                 .flags = RPC_TASK_ASYNC,
1542         };
1543         int status;
1544
1545         kref_get(&data->kref);
1546         data->rpc_done = 0;
1547         data->rpc_status = 0;
1548         data->cancelled = 0;
1549         if (isrecover)
1550                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1551         task = rpc_run_task(&task_setup_data);
1552         if (IS_ERR(task))
1553                 return PTR_ERR(task);
1554         status = nfs4_wait_for_completion_rpc_task(task);
1555         if (status != 0) {
1556                 data->cancelled = 1;
1557                 smp_wmb();
1558         } else
1559                 status = data->rpc_status;
1560         rpc_put_task(task);
1561
1562         return status;
1563 }
1564
1565 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1566 {
1567         struct inode *dir = data->dir->d_inode;
1568         struct nfs_openres *o_res = &data->o_res;
1569         int status;
1570
1571         status = nfs4_run_open_task(data, 1);
1572         if (status != 0 || !data->rpc_done)
1573                 return status;
1574
1575         nfs_refresh_inode(dir, o_res->dir_attr);
1576
1577         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1578                 status = _nfs4_proc_open_confirm(data);
1579                 if (status != 0)
1580                         return status;
1581         }
1582
1583         return status;
1584 }
1585
1586 /*
1587  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1588  */
1589 static int _nfs4_proc_open(struct nfs4_opendata *data)
1590 {
1591         struct inode *dir = data->dir->d_inode;
1592         struct nfs_server *server = NFS_SERVER(dir);
1593         struct nfs_openargs *o_arg = &data->o_arg;
1594         struct nfs_openres *o_res = &data->o_res;
1595         int status;
1596
1597         status = nfs4_run_open_task(data, 0);
1598         if (status != 0 || !data->rpc_done)
1599                 return status;
1600
1601         if (o_arg->open_flags & O_CREAT) {
1602                 update_changeattr(dir, &o_res->cinfo);
1603                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1604         } else
1605                 nfs_refresh_inode(dir, o_res->dir_attr);
1606         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1607                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1608         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1609                 status = _nfs4_proc_open_confirm(data);
1610                 if (status != 0)
1611                         return status;
1612         }
1613         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1614                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1615         return 0;
1616 }
1617
1618 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1619 {
1620         unsigned int loop;
1621         int ret;
1622
1623         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1624                 ret = nfs4_wait_clnt_recover(clp);
1625                 if (ret != 0)
1626                         break;
1627                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1628                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1629                         break;
1630                 nfs4_schedule_state_manager(clp);
1631                 ret = -EIO;
1632         }
1633         return ret;
1634 }
1635
1636 static int nfs4_recover_expired_lease(struct nfs_server *server)
1637 {
1638         return nfs4_client_recover_expired_lease(server->nfs_client);
1639 }
1640
1641 /*
1642  * OPEN_EXPIRED:
1643  *      reclaim state on the server after a network partition.
1644  *      Assumes caller holds the appropriate lock
1645  */
1646 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1647 {
1648         struct nfs4_opendata *opendata;
1649         int ret;
1650
1651         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1652         if (IS_ERR(opendata))
1653                 return PTR_ERR(opendata);
1654         ret = nfs4_open_recover(opendata, state);
1655         if (ret == -ESTALE)
1656                 d_drop(ctx->dentry);
1657         nfs4_opendata_put(opendata);
1658         return ret;
1659 }
1660
1661 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1662 {
1663         struct nfs_server *server = NFS_SERVER(state->inode);
1664         struct nfs4_exception exception = { };
1665         int err;
1666
1667         do {
1668                 err = _nfs4_open_expired(ctx, state);
1669                 switch (err) {
1670                 default:
1671                         goto out;
1672                 case -NFS4ERR_GRACE:
1673                 case -NFS4ERR_DELAY:
1674                         nfs4_handle_exception(server, err, &exception);
1675                         err = 0;
1676                 }
1677         } while (exception.retry);
1678 out:
1679         return err;
1680 }
1681
1682 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1683 {
1684         struct nfs_open_context *ctx;
1685         int ret;
1686
1687         ctx = nfs4_state_find_open_context(state);
1688         if (IS_ERR(ctx))
1689                 return PTR_ERR(ctx);
1690         ret = nfs4_do_open_expired(ctx, state);
1691         put_nfs_open_context(ctx);
1692         return ret;
1693 }
1694
1695 #if defined(CONFIG_NFS_V4_1)
1696 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1697 {
1698         int status;
1699         struct nfs_server *server = NFS_SERVER(state->inode);
1700
1701         status = nfs41_test_stateid(server, state);
1702         if (status == NFS_OK)
1703                 return 0;
1704         nfs41_free_stateid(server, state);
1705         return nfs4_open_expired(sp, state);
1706 }
1707 #endif
1708
1709 /*
1710  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1711  * fields corresponding to attributes that were used to store the verifier.
1712  * Make sure we clobber those fields in the later setattr call
1713  */
1714 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1715 {
1716         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1717             !(sattr->ia_valid & ATTR_ATIME_SET))
1718                 sattr->ia_valid |= ATTR_ATIME;
1719
1720         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1721             !(sattr->ia_valid & ATTR_MTIME_SET))
1722                 sattr->ia_valid |= ATTR_MTIME;
1723 }
1724
1725 /*
1726  * Returns a referenced nfs4_state
1727  */
1728 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)
1729 {
1730         struct nfs4_state_owner  *sp;
1731         struct nfs4_state     *state = NULL;
1732         struct nfs_server       *server = NFS_SERVER(dir);
1733         struct nfs4_opendata *opendata;
1734         int status;
1735
1736         /* Protect against reboot recovery conflicts */
1737         status = -ENOMEM;
1738         if (!(sp = nfs4_get_state_owner(server, cred))) {
1739                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1740                 goto out_err;
1741         }
1742         status = nfs4_recover_expired_lease(server);
1743         if (status != 0)
1744                 goto err_put_state_owner;
1745         if (dentry->d_inode != NULL)
1746                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1747         status = -ENOMEM;
1748         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1749         if (opendata == NULL)
1750                 goto err_put_state_owner;
1751
1752         if (dentry->d_inode != NULL)
1753                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1754
1755         status = _nfs4_proc_open(opendata);
1756         if (status != 0)
1757                 goto err_opendata_put;
1758
1759         state = nfs4_opendata_to_nfs4_state(opendata);
1760         status = PTR_ERR(state);
1761         if (IS_ERR(state))
1762                 goto err_opendata_put;
1763         if (server->caps & NFS_CAP_POSIX_LOCK)
1764                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1765
1766         if (opendata->o_arg.open_flags & O_EXCL) {
1767                 nfs4_exclusive_attrset(opendata, sattr);
1768
1769                 nfs_fattr_init(opendata->o_res.f_attr);
1770                 status = nfs4_do_setattr(state->inode, cred,
1771                                 opendata->o_res.f_attr, sattr,
1772                                 state);
1773                 if (status == 0)
1774                         nfs_setattr_update_inode(state->inode, sattr);
1775                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1776         }
1777         nfs4_opendata_put(opendata);
1778         nfs4_put_state_owner(sp);
1779         *res = state;
1780         return 0;
1781 err_opendata_put:
1782         nfs4_opendata_put(opendata);
1783 err_put_state_owner:
1784         nfs4_put_state_owner(sp);
1785 out_err:
1786         *res = NULL;
1787         return status;
1788 }
1789
1790
1791 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)
1792 {
1793         struct nfs4_exception exception = { };
1794         struct nfs4_state *res;
1795         int status;
1796
1797         do {
1798                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1799                 if (status == 0)
1800                         break;
1801                 /* NOTE: BAD_SEQID means the server and client disagree about the
1802                  * book-keeping w.r.t. state-changing operations
1803                  * (OPEN/CLOSE/LOCK/LOCKU...)
1804                  * It is actually a sign of a bug on the client or on the server.
1805                  *
1806                  * If we receive a BAD_SEQID error in the particular case of
1807                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1808                  * have unhashed the old state_owner for us, and that we can
1809                  * therefore safely retry using a new one. We should still warn
1810                  * the user though...
1811                  */
1812                 if (status == -NFS4ERR_BAD_SEQID) {
1813                         printk(KERN_WARNING "NFS: v4 server %s "
1814                                         " returned a bad sequence-id error!\n",
1815                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1816                         exception.retry = 1;
1817                         continue;
1818                 }
1819                 /*
1820                  * BAD_STATEID on OPEN means that the server cancelled our
1821                  * state before it received the OPEN_CONFIRM.
1822                  * Recover by retrying the request as per the discussion
1823                  * on Page 181 of RFC3530.
1824                  */
1825                 if (status == -NFS4ERR_BAD_STATEID) {
1826                         exception.retry = 1;
1827                         continue;
1828                 }
1829                 if (status == -EAGAIN) {
1830                         /* We must have found a delegation */
1831                         exception.retry = 1;
1832                         continue;
1833                 }
1834                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1835                                         status, &exception));
1836         } while (exception.retry);
1837         return res;
1838 }
1839
1840 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1841                             struct nfs_fattr *fattr, struct iattr *sattr,
1842                             struct nfs4_state *state)
1843 {
1844         struct nfs_server *server = NFS_SERVER(inode);
1845         struct nfs_setattrargs  arg = {
1846                 .fh             = NFS_FH(inode),
1847                 .iap            = sattr,
1848                 .server         = server,
1849                 .bitmask = server->attr_bitmask,
1850         };
1851         struct nfs_setattrres  res = {
1852                 .fattr          = fattr,
1853                 .server         = server,
1854         };
1855         struct rpc_message msg = {
1856                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1857                 .rpc_argp       = &arg,
1858                 .rpc_resp       = &res,
1859                 .rpc_cred       = cred,
1860         };
1861         unsigned long timestamp = jiffies;
1862         int status;
1863
1864         nfs_fattr_init(fattr);
1865
1866         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1867                 /* Use that stateid */
1868         } else if (state != NULL) {
1869                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1870         } else
1871                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1872
1873         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1874         if (status == 0 && state != NULL)
1875                 renew_lease(server, timestamp);
1876         return status;
1877 }
1878
1879 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1880                            struct nfs_fattr *fattr, struct iattr *sattr,
1881                            struct nfs4_state *state)
1882 {
1883         struct nfs_server *server = NFS_SERVER(inode);
1884         struct nfs4_exception exception = { };
1885         int err;
1886         do {
1887                 err = nfs4_handle_exception(server,
1888                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1889                                 &exception);
1890         } while (exception.retry);
1891         return err;
1892 }
1893
1894 struct nfs4_closedata {
1895         struct inode *inode;
1896         struct nfs4_state *state;
1897         struct nfs_closeargs arg;
1898         struct nfs_closeres res;
1899         struct nfs_fattr fattr;
1900         unsigned long timestamp;
1901         bool roc;
1902         u32 roc_barrier;
1903 };
1904
1905 static void nfs4_free_closedata(void *data)
1906 {
1907         struct nfs4_closedata *calldata = data;
1908         struct nfs4_state_owner *sp = calldata->state->owner;
1909         struct super_block *sb = calldata->state->inode->i_sb;
1910
1911         if (calldata->roc)
1912                 pnfs_roc_release(calldata->state->inode);
1913         nfs4_put_open_state(calldata->state);
1914         nfs_free_seqid(calldata->arg.seqid);
1915         nfs4_put_state_owner(sp);
1916         nfs_sb_deactive(sb);
1917         kfree(calldata);
1918 }
1919
1920 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1921                 fmode_t fmode)
1922 {
1923         spin_lock(&state->owner->so_lock);
1924         if (!(fmode & FMODE_READ))
1925                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1926         if (!(fmode & FMODE_WRITE))
1927                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1928         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1929         spin_unlock(&state->owner->so_lock);
1930 }
1931
1932 static void nfs4_close_done(struct rpc_task *task, void *data)
1933 {
1934         struct nfs4_closedata *calldata = data;
1935         struct nfs4_state *state = calldata->state;
1936         struct nfs_server *server = NFS_SERVER(calldata->inode);
1937
1938         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1939                 return;
1940         /* hmm. we are done with the inode, and in the process of freeing
1941          * the state_owner. we keep this around to process errors
1942          */
1943         switch (task->tk_status) {
1944                 case 0:
1945                         if (calldata->roc)
1946                                 pnfs_roc_set_barrier(state->inode,
1947                                                      calldata->roc_barrier);
1948                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1949                         renew_lease(server, calldata->timestamp);
1950                         nfs4_close_clear_stateid_flags(state,
1951                                         calldata->arg.fmode);
1952                         break;
1953                 case -NFS4ERR_STALE_STATEID:
1954                 case -NFS4ERR_OLD_STATEID:
1955                 case -NFS4ERR_BAD_STATEID:
1956                 case -NFS4ERR_EXPIRED:
1957                         if (calldata->arg.fmode == 0)
1958                                 break;
1959                 default:
1960                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1961                                 rpc_restart_call_prepare(task);
1962         }
1963         nfs_release_seqid(calldata->arg.seqid);
1964         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1965 }
1966
1967 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1968 {
1969         struct nfs4_closedata *calldata = data;
1970         struct nfs4_state *state = calldata->state;
1971         int call_close = 0;
1972
1973         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1974                 return;
1975
1976         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1977         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1978         spin_lock(&state->owner->so_lock);
1979         /* Calculate the change in open mode */
1980         if (state->n_rdwr == 0) {
1981                 if (state->n_rdonly == 0) {
1982                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1983                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1984                         calldata->arg.fmode &= ~FMODE_READ;
1985                 }
1986                 if (state->n_wronly == 0) {
1987                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1988                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1989                         calldata->arg.fmode &= ~FMODE_WRITE;
1990                 }
1991         }
1992         spin_unlock(&state->owner->so_lock);
1993
1994         if (!call_close) {
1995                 /* Note: exit _without_ calling nfs4_close_done */
1996                 task->tk_action = NULL;
1997                 return;
1998         }
1999
2000         if (calldata->arg.fmode == 0) {
2001                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2002                 if (calldata->roc &&
2003                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2004                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2005                                      task, NULL);
2006                         return;
2007                 }
2008         }
2009
2010         nfs_fattr_init(calldata->res.fattr);
2011         calldata->timestamp = jiffies;
2012         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2013                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2014                                 1, task))
2015                 return;
2016         rpc_call_start(task);
2017 }
2018
2019 static const struct rpc_call_ops nfs4_close_ops = {
2020         .rpc_call_prepare = nfs4_close_prepare,
2021         .rpc_call_done = nfs4_close_done,
2022         .rpc_release = nfs4_free_closedata,
2023 };
2024
2025 /*
2026  * It is possible for data to be read/written from a mem-mapped file
2027  * after the sys_close call (which hits the vfs layer as a flush).
2028  * This means that we can't safely call nfsv4 close on a file until
2029  * the inode is cleared. This in turn means that we are not good
2030  * NFSv4 citizens - we do not indicate to the server to update the file's
2031  * share state even when we are done with one of the three share
2032  * stateid's in the inode.
2033  *
2034  * NOTE: Caller must be holding the sp->so_owner semaphore!
2035  */
2036 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2037 {
2038         struct nfs_server *server = NFS_SERVER(state->inode);
2039         struct nfs4_closedata *calldata;
2040         struct nfs4_state_owner *sp = state->owner;
2041         struct rpc_task *task;
2042         struct rpc_message msg = {
2043                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2044                 .rpc_cred = state->owner->so_cred,
2045         };
2046         struct rpc_task_setup task_setup_data = {
2047                 .rpc_client = server->client,
2048                 .rpc_message = &msg,
2049                 .callback_ops = &nfs4_close_ops,
2050                 .workqueue = nfsiod_workqueue,
2051                 .flags = RPC_TASK_ASYNC,
2052         };
2053         int status = -ENOMEM;
2054
2055         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2056         if (calldata == NULL)
2057                 goto out;
2058         calldata->inode = state->inode;
2059         calldata->state = state;
2060         calldata->arg.fh = NFS_FH(state->inode);
2061         calldata->arg.stateid = &state->open_stateid;
2062         /* Serialization for the sequence id */
2063         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2064         if (calldata->arg.seqid == NULL)
2065                 goto out_free_calldata;
2066         calldata->arg.fmode = 0;
2067         calldata->arg.bitmask = server->cache_consistency_bitmask;
2068         calldata->res.fattr = &calldata->fattr;
2069         calldata->res.seqid = calldata->arg.seqid;
2070         calldata->res.server = server;
2071         calldata->roc = roc;
2072         nfs_sb_active(calldata->inode->i_sb);
2073
2074         msg.rpc_argp = &calldata->arg;
2075         msg.rpc_resp = &calldata->res;
2076         task_setup_data.callback_data = calldata;
2077         task = rpc_run_task(&task_setup_data);
2078         if (IS_ERR(task))
2079                 return PTR_ERR(task);
2080         status = 0;
2081         if (wait)
2082                 status = rpc_wait_for_completion_task(task);
2083         rpc_put_task(task);
2084         return status;
2085 out_free_calldata:
2086         kfree(calldata);
2087 out:
2088         if (roc)
2089                 pnfs_roc_release(state->inode);
2090         nfs4_put_open_state(state);
2091         nfs4_put_state_owner(sp);
2092         return status;
2093 }
2094
2095 static struct inode *
2096 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2097 {
2098         struct nfs4_state *state;
2099
2100         /* Protect against concurrent sillydeletes */
2101         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2102         if (IS_ERR(state))
2103                 return ERR_CAST(state);
2104         ctx->state = state;
2105         return igrab(state->inode);
2106 }
2107
2108 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2109 {
2110         if (ctx->state == NULL)
2111                 return;
2112         if (is_sync)
2113                 nfs4_close_sync(ctx->state, ctx->mode);
2114         else
2115                 nfs4_close_state(ctx->state, ctx->mode);
2116 }
2117
2118 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2119 {
2120         struct nfs4_server_caps_arg args = {
2121                 .fhandle = fhandle,
2122         };
2123         struct nfs4_server_caps_res res = {};
2124         struct rpc_message msg = {
2125                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2126                 .rpc_argp = &args,
2127                 .rpc_resp = &res,
2128         };
2129         int status;
2130
2131         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2132         if (status == 0) {
2133                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2134                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2135                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2136                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2137                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2138                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2139                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2140                         server->caps |= NFS_CAP_ACLS;
2141                 if (res.has_links != 0)
2142                         server->caps |= NFS_CAP_HARDLINKS;
2143                 if (res.has_symlinks != 0)
2144                         server->caps |= NFS_CAP_SYMLINKS;
2145                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2146                         server->caps |= NFS_CAP_FILEID;
2147                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2148                         server->caps |= NFS_CAP_MODE;
2149                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2150                         server->caps |= NFS_CAP_NLINK;
2151                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2152                         server->caps |= NFS_CAP_OWNER;
2153                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2154                         server->caps |= NFS_CAP_OWNER_GROUP;
2155                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2156                         server->caps |= NFS_CAP_ATIME;
2157                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2158                         server->caps |= NFS_CAP_CTIME;
2159                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2160                         server->caps |= NFS_CAP_MTIME;
2161
2162                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2163                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2164                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2165                 server->acl_bitmask = res.acl_bitmask;
2166         }
2167
2168         return status;
2169 }
2170
2171 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2172 {
2173         struct nfs4_exception exception = { };
2174         int err;
2175         do {
2176                 err = nfs4_handle_exception(server,
2177                                 _nfs4_server_capabilities(server, fhandle),
2178                                 &exception);
2179         } while (exception.retry);
2180         return err;
2181 }
2182
2183 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2184                 struct nfs_fsinfo *info)
2185 {
2186         struct nfs4_lookup_root_arg args = {
2187                 .bitmask = nfs4_fattr_bitmap,
2188         };
2189         struct nfs4_lookup_res res = {
2190                 .server = server,
2191                 .fattr = info->fattr,
2192                 .fh = fhandle,
2193         };
2194         struct rpc_message msg = {
2195                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2196                 .rpc_argp = &args,
2197                 .rpc_resp = &res,
2198         };
2199
2200         nfs_fattr_init(info->fattr);
2201         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2202 }
2203
2204 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2205                 struct nfs_fsinfo *info)
2206 {
2207         struct nfs4_exception exception = { };
2208         int err;
2209         do {
2210                 err = _nfs4_lookup_root(server, fhandle, info);
2211                 switch (err) {
2212                 case 0:
2213                 case -NFS4ERR_WRONGSEC:
2214                         break;
2215                 default:
2216                         err = nfs4_handle_exception(server, err, &exception);
2217                 }
2218         } while (exception.retry);
2219         return err;
2220 }
2221
2222 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2223                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2224 {
2225         struct rpc_auth *auth;
2226         int ret;
2227
2228         auth = rpcauth_create(flavor, server->client);
2229         if (!auth) {
2230                 ret = -EIO;
2231                 goto out;
2232         }
2233         ret = nfs4_lookup_root(server, fhandle, info);
2234 out:
2235         return ret;
2236 }
2237
2238 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2239                               struct nfs_fsinfo *info)
2240 {
2241         int i, len, status = 0;
2242         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2243
2244         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2245         flav_array[len] = RPC_AUTH_NULL;
2246         len += 1;
2247
2248         for (i = 0; i < len; i++) {
2249                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2250                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2251                         continue;
2252                 break;
2253         }
2254         /*
2255          * -EACCESS could mean that the user doesn't have correct permissions
2256          * to access the mount.  It could also mean that we tried to mount
2257          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2258          * existing mount programs don't handle -EACCES very well so it should
2259          * be mapped to -EPERM instead.
2260          */
2261         if (status == -EACCES)
2262                 status = -EPERM;
2263         return status;
2264 }
2265
2266 /*
2267  * get the file handle for the "/" directory on the server
2268  */
2269 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2270                               struct nfs_fsinfo *info)
2271 {
2272         int minor_version = server->nfs_client->cl_minorversion;
2273         int status = nfs4_lookup_root(server, fhandle, info);
2274         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2275                 /*
2276                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2277                  * by nfs4_map_errors() as this function exits.
2278                  */
2279                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2280         if (status == 0)
2281                 status = nfs4_server_capabilities(server, fhandle);
2282         if (status == 0)
2283                 status = nfs4_do_fsinfo(server, fhandle, info);
2284         return nfs4_map_errors(status);
2285 }
2286
2287 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2288 /*
2289  * Get locations and (maybe) other attributes of a referral.
2290  * Note that we'll actually follow the referral later when
2291  * we detect fsid mismatch in inode revalidation
2292  */
2293 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2294                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2295 {
2296         int status = -ENOMEM;
2297         struct page *page = NULL;
2298         struct nfs4_fs_locations *locations = NULL;
2299
2300         page = alloc_page(GFP_KERNEL);
2301         if (page == NULL)
2302                 goto out;
2303         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2304         if (locations == NULL)
2305                 goto out;
2306
2307         status = nfs4_proc_fs_locations(dir, name, locations, page);
2308         if (status != 0)
2309                 goto out;
2310         /* Make sure server returned a different fsid for the referral */
2311         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2312                 dprintk("%s: server did not return a different fsid for"
2313                         " a referral at %s\n", __func__, name->name);
2314                 status = -EIO;
2315                 goto out;
2316         }
2317         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2318         nfs_fixup_referral_attributes(&locations->fattr);
2319
2320         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2321         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2322         memset(fhandle, 0, sizeof(struct nfs_fh));
2323 out:
2324         if (page)
2325                 __free_page(page);
2326         kfree(locations);
2327         return status;
2328 }
2329
2330 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2331 {
2332         struct nfs4_getattr_arg args = {
2333                 .fh = fhandle,
2334                 .bitmask = server->attr_bitmask,
2335         };
2336         struct nfs4_getattr_res res = {
2337                 .fattr = fattr,
2338                 .server = server,
2339         };
2340         struct rpc_message msg = {
2341                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2342                 .rpc_argp = &args,
2343                 .rpc_resp = &res,
2344         };
2345
2346         nfs_fattr_init(fattr);
2347         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2348 }
2349
2350 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2351 {
2352         struct nfs4_exception exception = { };
2353         int err;
2354         do {
2355                 err = nfs4_handle_exception(server,
2356                                 _nfs4_proc_getattr(server, fhandle, fattr),
2357                                 &exception);
2358         } while (exception.retry);
2359         return err;
2360 }
2361
2362 /*
2363  * The file is not closed if it is opened due to the a request to change
2364  * the size of the file. The open call will not be needed once the
2365  * VFS layer lookup-intents are implemented.
2366  *
2367  * Close is called when the inode is destroyed.
2368  * If we haven't opened the file for O_WRONLY, we
2369  * need to in the size_change case to obtain a stateid.
2370  *
2371  * Got race?
2372  * Because OPEN is always done by name in nfsv4, it is
2373  * possible that we opened a different file by the same
2374  * name.  We can recognize this race condition, but we
2375  * can't do anything about it besides returning an error.
2376  *
2377  * This will be fixed with VFS changes (lookup-intent).
2378  */
2379 static int
2380 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2381                   struct iattr *sattr)
2382 {
2383         struct inode *inode = dentry->d_inode;
2384         struct rpc_cred *cred = NULL;
2385         struct nfs4_state *state = NULL;
2386         int status;
2387
2388         if (pnfs_ld_layoutret_on_setattr(inode))
2389                 pnfs_return_layout(inode);
2390
2391         nfs_fattr_init(fattr);
2392
2393         /* Search for an existing open(O_WRITE) file */
2394         if (sattr->ia_valid & ATTR_FILE) {
2395                 struct nfs_open_context *ctx;
2396
2397                 ctx = nfs_file_open_context(sattr->ia_file);
2398                 if (ctx) {
2399                         cred = ctx->cred;
2400                         state = ctx->state;
2401                 }
2402         }
2403
2404         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2405         if (status == 0)
2406                 nfs_setattr_update_inode(inode, sattr);
2407         return status;
2408 }
2409
2410 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2411                 const struct nfs_fh *dirfh, const struct qstr *name,
2412                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2413 {
2414         int                    status;
2415         struct nfs4_lookup_arg args = {
2416                 .bitmask = server->attr_bitmask,
2417                 .dir_fh = dirfh,
2418                 .name = name,
2419         };
2420         struct nfs4_lookup_res res = {
2421                 .server = server,
2422                 .fattr = fattr,
2423                 .fh = fhandle,
2424         };
2425         struct rpc_message msg = {
2426                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2427                 .rpc_argp = &args,
2428                 .rpc_resp = &res,
2429         };
2430
2431         nfs_fattr_init(fattr);
2432
2433         dprintk("NFS call  lookupfh %s\n", name->name);
2434         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2435         dprintk("NFS reply lookupfh: %d\n", status);
2436         return status;
2437 }
2438
2439 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2440                               struct qstr *name, struct nfs_fh *fhandle,
2441                               struct nfs_fattr *fattr)
2442 {
2443         struct nfs4_exception exception = { };
2444         int err;
2445         do {
2446                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2447                 /* FIXME: !!!! */
2448                 if (err == -NFS4ERR_MOVED) {
2449                         err = -EREMOTE;
2450                         break;
2451                 }
2452                 err = nfs4_handle_exception(server, err, &exception);
2453         } while (exception.retry);
2454         return err;
2455 }
2456
2457 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2458                 const struct qstr *name, struct nfs_fh *fhandle,
2459                 struct nfs_fattr *fattr)
2460 {
2461         int status;
2462
2463         dprintk("NFS call  lookup %s\n", name->name);
2464         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2465         if (status == -NFS4ERR_MOVED)
2466                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2467         dprintk("NFS reply lookup: %d\n", status);
2468         return status;
2469 }
2470
2471 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2472 {
2473         memset(fh, 0, sizeof(struct nfs_fh));
2474         fattr->fsid.major = 1;
2475         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2476                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2477         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2478         fattr->nlink = 2;
2479 }
2480
2481 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2482                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2483 {
2484         struct nfs4_exception exception = { };
2485         int err;
2486         do {
2487                 err = nfs4_handle_exception(NFS_SERVER(dir),
2488                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2489                                 &exception);
2490                 if (err == -EPERM)
2491                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2492         } while (exception.retry);
2493         return err;
2494 }
2495
2496 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2497 {
2498         struct nfs_server *server = NFS_SERVER(inode);
2499         struct nfs4_accessargs args = {
2500                 .fh = NFS_FH(inode),
2501                 .bitmask = server->attr_bitmask,
2502         };
2503         struct nfs4_accessres res = {
2504                 .server = server,
2505         };
2506         struct rpc_message msg = {
2507                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2508                 .rpc_argp = &args,
2509                 .rpc_resp = &res,
2510                 .rpc_cred = entry->cred,
2511         };
2512         int mode = entry->mask;
2513         int status;
2514
2515         /*
2516          * Determine which access bits we want to ask for...
2517          */
2518         if (mode & MAY_READ)
2519                 args.access |= NFS4_ACCESS_READ;
2520         if (S_ISDIR(inode->i_mode)) {
2521                 if (mode & MAY_WRITE)
2522                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2523                 if (mode & MAY_EXEC)
2524                         args.access |= NFS4_ACCESS_LOOKUP;
2525         } else {
2526                 if (mode & MAY_WRITE)
2527                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2528                 if (mode & MAY_EXEC)
2529                         args.access |= NFS4_ACCESS_EXECUTE;
2530         }
2531
2532         res.fattr = nfs_alloc_fattr();
2533         if (res.fattr == NULL)
2534                 return -ENOMEM;
2535
2536         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2537         if (!status) {
2538                 entry->mask = 0;
2539                 if (res.access & NFS4_ACCESS_READ)
2540                         entry->mask |= MAY_READ;
2541                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2542                         entry->mask |= MAY_WRITE;
2543                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2544                         entry->mask |= MAY_EXEC;
2545                 nfs_refresh_inode(inode, res.fattr);
2546         }
2547         nfs_free_fattr(res.fattr);
2548         return status;
2549 }
2550
2551 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2552 {
2553         struct nfs4_exception exception = { };
2554         int err;
2555         do {
2556                 err = nfs4_handle_exception(NFS_SERVER(inode),
2557                                 _nfs4_proc_access(inode, entry),
2558                                 &exception);
2559         } while (exception.retry);
2560         return err;
2561 }
2562
2563 /*
2564  * TODO: For the time being, we don't try to get any attributes
2565  * along with any of the zero-copy operations READ, READDIR,
2566  * READLINK, WRITE.
2567  *
2568  * In the case of the first three, we want to put the GETATTR
2569  * after the read-type operation -- this is because it is hard
2570  * to predict the length of a GETATTR response in v4, and thus
2571  * align the READ data correctly.  This means that the GETATTR
2572  * may end up partially falling into the page cache, and we should
2573  * shift it into the 'tail' of the xdr_buf before processing.
2574  * To do this efficiently, we need to know the total length
2575  * of data received, which doesn't seem to be available outside
2576  * of the RPC layer.
2577  *
2578  * In the case of WRITE, we also want to put the GETATTR after
2579  * the operation -- in this case because we want to make sure
2580  * we get the post-operation mtime and size.  This means that
2581  * we can't use xdr_encode_pages() as written: we need a variant
2582  * of it which would leave room in the 'tail' iovec.
2583  *
2584  * Both of these changes to the XDR layer would in fact be quite
2585  * minor, but I decided to leave them for a subsequent patch.
2586  */
2587 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2588                 unsigned int pgbase, unsigned int pglen)
2589 {
2590         struct nfs4_readlink args = {
2591                 .fh       = NFS_FH(inode),
2592                 .pgbase   = pgbase,
2593                 .pglen    = pglen,
2594                 .pages    = &page,
2595         };
2596         struct nfs4_readlink_res res;
2597         struct rpc_message msg = {
2598                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2599                 .rpc_argp = &args,
2600                 .rpc_resp = &res,
2601         };
2602
2603         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2604 }
2605
2606 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2607                 unsigned int pgbase, unsigned int pglen)
2608 {
2609         struct nfs4_exception exception = { };
2610         int err;
2611         do {
2612                 err = nfs4_handle_exception(NFS_SERVER(inode),
2613                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2614                                 &exception);
2615         } while (exception.retry);
2616         return err;
2617 }
2618
2619 /*
2620  * Got race?
2621  * We will need to arrange for the VFS layer to provide an atomic open.
2622  * Until then, this create/open method is prone to inefficiency and race
2623  * conditions due to the lookup, create, and open VFS calls from sys_open()
2624  * placed on the wire.
2625  *
2626  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2627  * The file will be opened again in the subsequent VFS open call
2628  * (nfs4_proc_file_open).
2629  *
2630  * The open for read will just hang around to be used by any process that
2631  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2632  */
2633
2634 static int
2635 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2636                  int flags, struct nfs_open_context *ctx)
2637 {
2638         struct dentry *de = dentry;
2639         struct nfs4_state *state;
2640         struct rpc_cred *cred = NULL;
2641         fmode_t fmode = 0;
2642         int status = 0;
2643
2644         if (ctx != NULL) {
2645                 cred = ctx->cred;
2646                 de = ctx->dentry;
2647                 fmode = ctx->mode;
2648         }
2649         sattr->ia_mode &= ~current_umask();
2650         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2651         d_drop(dentry);
2652         if (IS_ERR(state)) {
2653                 status = PTR_ERR(state);
2654                 goto out;
2655         }
2656         d_add(dentry, igrab(state->inode));
2657         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2658         if (ctx != NULL)
2659                 ctx->state = state;
2660         else
2661                 nfs4_close_sync(state, fmode);
2662 out:
2663         return status;
2664 }
2665
2666 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2667 {
2668         struct nfs_server *server = NFS_SERVER(dir);
2669         struct nfs_removeargs args = {
2670                 .fh = NFS_FH(dir),
2671                 .name.len = name->len,
2672                 .name.name = name->name,
2673                 .bitmask = server->attr_bitmask,
2674         };
2675         struct nfs_removeres res = {
2676                 .server = server,
2677         };
2678         struct rpc_message msg = {
2679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2680                 .rpc_argp = &args,
2681                 .rpc_resp = &res,
2682         };
2683         int status = -ENOMEM;
2684
2685         res.dir_attr = nfs_alloc_fattr();
2686         if (res.dir_attr == NULL)
2687                 goto out;
2688
2689         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2690         if (status == 0) {
2691                 update_changeattr(dir, &res.cinfo);
2692                 nfs_post_op_update_inode(dir, res.dir_attr);
2693         }
2694         nfs_free_fattr(res.dir_attr);
2695 out:
2696         return status;
2697 }
2698
2699 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2700 {
2701         struct nfs4_exception exception = { };
2702         int err;
2703         do {
2704                 err = nfs4_handle_exception(NFS_SERVER(dir),
2705                                 _nfs4_proc_remove(dir, name),
2706                                 &exception);
2707         } while (exception.retry);
2708         return err;
2709 }
2710
2711 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2712 {
2713         struct nfs_server *server = NFS_SERVER(dir);
2714         struct nfs_removeargs *args = msg->rpc_argp;
2715         struct nfs_removeres *res = msg->rpc_resp;
2716
2717         args->bitmask = server->cache_consistency_bitmask;
2718         res->server = server;
2719         res->seq_res.sr_slot = NULL;
2720         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2721 }
2722
2723 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2724 {
2725         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2726
2727         if (!nfs4_sequence_done(task, &res->seq_res))
2728                 return 0;
2729         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2730                 return 0;
2731         update_changeattr(dir, &res->cinfo);
2732         nfs_post_op_update_inode(dir, res->dir_attr);
2733         return 1;
2734 }
2735
2736 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2737 {
2738         struct nfs_server *server = NFS_SERVER(dir);
2739         struct nfs_renameargs *arg = msg->rpc_argp;
2740         struct nfs_renameres *res = msg->rpc_resp;
2741
2742         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2743         arg->bitmask = server->attr_bitmask;
2744         res->server = server;
2745 }
2746
2747 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2748                                  struct inode *new_dir)
2749 {
2750         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2751
2752         if (!nfs4_sequence_done(task, &res->seq_res))
2753                 return 0;
2754         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2755                 return 0;
2756
2757         update_changeattr(old_dir, &res->old_cinfo);
2758         nfs_post_op_update_inode(old_dir, res->old_fattr);
2759         update_changeattr(new_dir, &res->new_cinfo);
2760         nfs_post_op_update_inode(new_dir, res->new_fattr);
2761         return 1;
2762 }
2763
2764 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2765                 struct inode *new_dir, struct qstr *new_name)
2766 {
2767         struct nfs_server *server = NFS_SERVER(old_dir);
2768         struct nfs_renameargs arg = {
2769                 .old_dir = NFS_FH(old_dir),
2770                 .new_dir = NFS_FH(new_dir),
2771                 .old_name = old_name,
2772                 .new_name = new_name,
2773                 .bitmask = server->attr_bitmask,
2774         };
2775         struct nfs_renameres res = {
2776                 .server = server,
2777         };
2778         struct rpc_message msg = {
2779                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2780                 .rpc_argp = &arg,
2781                 .rpc_resp = &res,
2782         };
2783         int status = -ENOMEM;
2784
2785         res.old_fattr = nfs_alloc_fattr();
2786         res.new_fattr = nfs_alloc_fattr();
2787         if (res.old_fattr == NULL || res.new_fattr == NULL)
2788                 goto out;
2789
2790         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2791         if (!status) {
2792                 update_changeattr(old_dir, &res.old_cinfo);
2793                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2794                 update_changeattr(new_dir, &res.new_cinfo);
2795                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2796         }
2797 out:
2798         nfs_free_fattr(res.new_fattr);
2799         nfs_free_fattr(res.old_fattr);
2800         return status;
2801 }
2802
2803 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2804                 struct inode *new_dir, struct qstr *new_name)
2805 {
2806         struct nfs4_exception exception = { };
2807         int err;
2808         do {
2809                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2810                                 _nfs4_proc_rename(old_dir, old_name,
2811                                         new_dir, new_name),
2812                                 &exception);
2813         } while (exception.retry);
2814         return err;
2815 }
2816
2817 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2818 {
2819         struct nfs_server *server = NFS_SERVER(inode);
2820         struct nfs4_link_arg arg = {
2821                 .fh     = NFS_FH(inode),
2822                 .dir_fh = NFS_FH(dir),
2823                 .name   = name,
2824                 .bitmask = server->attr_bitmask,
2825         };
2826         struct nfs4_link_res res = {
2827                 .server = server,
2828         };
2829         struct rpc_message msg = {
2830                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2831                 .rpc_argp = &arg,
2832                 .rpc_resp = &res,
2833         };
2834         int status = -ENOMEM;
2835
2836         res.fattr = nfs_alloc_fattr();
2837         res.dir_attr = nfs_alloc_fattr();
2838         if (res.fattr == NULL || res.dir_attr == NULL)
2839                 goto out;
2840
2841         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2842         if (!status) {
2843                 update_changeattr(dir, &res.cinfo);
2844                 nfs_post_op_update_inode(dir, res.dir_attr);
2845                 nfs_post_op_update_inode(inode, res.fattr);
2846         }
2847 out:
2848         nfs_free_fattr(res.dir_attr);
2849         nfs_free_fattr(res.fattr);
2850         return status;
2851 }
2852
2853 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2854 {
2855         struct nfs4_exception exception = { };
2856         int err;
2857         do {
2858                 err = nfs4_handle_exception(NFS_SERVER(inode),
2859                                 _nfs4_proc_link(inode, dir, name),
2860                                 &exception);
2861         } while (exception.retry);
2862         return err;
2863 }
2864
2865 struct nfs4_createdata {
2866         struct rpc_message msg;
2867         struct nfs4_create_arg arg;
2868         struct nfs4_create_res res;
2869         struct nfs_fh fh;
2870         struct nfs_fattr fattr;
2871         struct nfs_fattr dir_fattr;
2872 };
2873
2874 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2875                 struct qstr *name, struct iattr *sattr, u32 ftype)
2876 {
2877         struct nfs4_createdata *data;
2878
2879         data = kzalloc(sizeof(*data), GFP_KERNEL);
2880         if (data != NULL) {
2881                 struct nfs_server *server = NFS_SERVER(dir);
2882
2883                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2884                 data->msg.rpc_argp = &data->arg;
2885                 data->msg.rpc_resp = &data->res;
2886                 data->arg.dir_fh = NFS_FH(dir);
2887                 data->arg.server = server;
2888                 data->arg.name = name;
2889                 data->arg.attrs = sattr;
2890                 data->arg.ftype = ftype;
2891                 data->arg.bitmask = server->attr_bitmask;
2892                 data->res.server = server;
2893                 data->res.fh = &data->fh;
2894                 data->res.fattr = &data->fattr;
2895                 data->res.dir_fattr = &data->dir_fattr;
2896                 nfs_fattr_init(data->res.fattr);
2897                 nfs_fattr_init(data->res.dir_fattr);
2898         }
2899         return data;
2900 }
2901
2902 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2903 {
2904         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2905                                     &data->arg.seq_args, &data->res.seq_res, 1);
2906         if (status == 0) {
2907                 update_changeattr(dir, &data->res.dir_cinfo);
2908                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2909                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2910         }
2911         return status;
2912 }
2913
2914 static void nfs4_free_createdata(struct nfs4_createdata *data)
2915 {
2916         kfree(data);
2917 }
2918
2919 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2920                 struct page *page, unsigned int len, struct iattr *sattr)
2921 {
2922         struct nfs4_createdata *data;
2923         int status = -ENAMETOOLONG;
2924
2925         if (len > NFS4_MAXPATHLEN)
2926                 goto out;
2927
2928         status = -ENOMEM;
2929         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2930         if (data == NULL)
2931                 goto out;
2932
2933         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2934         data->arg.u.symlink.pages = &page;
2935         data->arg.u.symlink.len = len;
2936
2937         status = nfs4_do_create(dir, dentry, data);
2938
2939         nfs4_free_createdata(data);
2940 out:
2941         return status;
2942 }
2943
2944 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2945                 struct page *page, unsigned int len, struct iattr *sattr)
2946 {
2947         struct nfs4_exception exception = { };
2948         int err;
2949         do {
2950                 err = nfs4_handle_exception(NFS_SERVER(dir),
2951                                 _nfs4_proc_symlink(dir, dentry, page,
2952                                                         len, sattr),
2953                                 &exception);
2954         } while (exception.retry);
2955         return err;
2956 }
2957
2958 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2959                 struct iattr *sattr)
2960 {
2961         struct nfs4_createdata *data;
2962         int status = -ENOMEM;
2963
2964         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2965         if (data == NULL)
2966                 goto out;
2967
2968         status = nfs4_do_create(dir, dentry, data);
2969
2970         nfs4_free_createdata(data);
2971 out:
2972         return status;
2973 }
2974
2975 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2976                 struct iattr *sattr)
2977 {
2978         struct nfs4_exception exception = { };
2979         int err;
2980
2981         sattr->ia_mode &= ~current_umask();
2982         do {
2983                 err = nfs4_handle_exception(NFS_SERVER(dir),
2984                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2985                                 &exception);
2986         } while (exception.retry);
2987         return err;
2988 }
2989
2990 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2991                 u64 cookie, struct page **pages, unsigned int count, int plus)
2992 {
2993         struct inode            *dir = dentry->d_inode;
2994         struct nfs4_readdir_arg args = {
2995                 .fh = NFS_FH(dir),
2996                 .pages = pages,
2997                 .pgbase = 0,
2998                 .count = count,
2999                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3000                 .plus = plus,
3001         };
3002         struct nfs4_readdir_res res;
3003         struct rpc_message msg = {
3004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3005                 .rpc_argp = &args,
3006                 .rpc_resp = &res,
3007                 .rpc_cred = cred,
3008         };
3009         int                     status;
3010
3011         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3012                         dentry->d_parent->d_name.name,
3013                         dentry->d_name.name,
3014                         (unsigned long long)cookie);
3015         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3016         res.pgbase = args.pgbase;
3017         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3018         if (status >= 0) {
3019                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3020                 status += args.pgbase;
3021         }
3022
3023         nfs_invalidate_atime(dir);
3024
3025         dprintk("%s: returns %d\n", __func__, status);
3026         return status;
3027 }
3028
3029 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3030                 u64 cookie, struct page **pages, unsigned int count, int plus)
3031 {
3032         struct nfs4_exception exception = { };
3033         int err;
3034         do {
3035                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3036                                 _nfs4_proc_readdir(dentry, cred, cookie,
3037                                         pages, count, plus),
3038                                 &exception);
3039         } while (exception.retry);
3040         return err;
3041 }
3042
3043 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3044                 struct iattr *sattr, dev_t rdev)
3045 {
3046         struct nfs4_createdata *data;
3047         int mode = sattr->ia_mode;
3048         int status = -ENOMEM;
3049
3050         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3051         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3052
3053         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3054         if (data == NULL)
3055                 goto out;
3056
3057         if (S_ISFIFO(mode))
3058                 data->arg.ftype = NF4FIFO;
3059         else if (S_ISBLK(mode)) {
3060                 data->arg.ftype = NF4BLK;
3061                 data->arg.u.device.specdata1 = MAJOR(rdev);
3062                 data->arg.u.device.specdata2 = MINOR(rdev);
3063         }
3064         else if (S_ISCHR(mode)) {
3065                 data->arg.ftype = NF4CHR;
3066                 data->arg.u.device.specdata1 = MAJOR(rdev);
3067                 data->arg.u.device.specdata2 = MINOR(rdev);
3068         }
3069
3070         status = nfs4_do_create(dir, dentry, data);
3071
3072         nfs4_free_createdata(data);
3073 out:
3074         return status;
3075 }
3076
3077 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3078                 struct iattr *sattr, dev_t rdev)
3079 {
3080         struct nfs4_exception exception = { };
3081         int err;
3082
3083         sattr->ia_mode &= ~current_umask();
3084         do {
3085                 err = nfs4_handle_exception(NFS_SERVER(dir),
3086                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3087                                 &exception);
3088         } while (exception.retry);
3089         return err;
3090 }
3091
3092 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3093                  struct nfs_fsstat *fsstat)
3094 {
3095         struct nfs4_statfs_arg args = {
3096                 .fh = fhandle,
3097                 .bitmask = server->attr_bitmask,
3098         };
3099         struct nfs4_statfs_res res = {
3100                 .fsstat = fsstat,
3101         };
3102         struct rpc_message msg = {
3103                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3104                 .rpc_argp = &args,
3105                 .rpc_resp = &res,
3106         };
3107
3108         nfs_fattr_init(fsstat->fattr);
3109         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3110 }
3111
3112 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3113 {
3114         struct nfs4_exception exception = { };
3115         int err;
3116         do {
3117                 err = nfs4_handle_exception(server,
3118                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3119                                 &exception);
3120         } while (exception.retry);
3121         return err;
3122 }
3123
3124 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3125                 struct nfs_fsinfo *fsinfo)
3126 {
3127         struct nfs4_fsinfo_arg args = {
3128                 .fh = fhandle,
3129                 .bitmask = server->attr_bitmask,
3130         };
3131         struct nfs4_fsinfo_res res = {
3132                 .fsinfo = fsinfo,
3133         };
3134         struct rpc_message msg = {
3135                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3136                 .rpc_argp = &args,
3137                 .rpc_resp = &res,
3138         };
3139
3140         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3141 }
3142
3143 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3144 {
3145         struct nfs4_exception exception = { };
3146         int err;
3147
3148         do {
3149                 err = nfs4_handle_exception(server,
3150                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3151                                 &exception);
3152         } while (exception.retry);
3153         return err;
3154 }
3155
3156 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3157 {
3158         nfs_fattr_init(fsinfo->fattr);
3159         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3160 }
3161
3162 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3163                 struct nfs_pathconf *pathconf)
3164 {
3165         struct nfs4_pathconf_arg args = {
3166                 .fh = fhandle,
3167                 .bitmask = server->attr_bitmask,
3168         };
3169         struct nfs4_pathconf_res res = {
3170                 .pathconf = pathconf,
3171         };
3172         struct rpc_message msg = {
3173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3174                 .rpc_argp = &args,
3175                 .rpc_resp = &res,
3176         };
3177
3178         /* None of the pathconf attributes are mandatory to implement */
3179         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3180                 memset(pathconf, 0, sizeof(*pathconf));
3181                 return 0;
3182         }
3183
3184         nfs_fattr_init(pathconf->fattr);
3185         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3186 }
3187
3188 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3189                 struct nfs_pathconf *pathconf)
3190 {
3191         struct nfs4_exception exception = { };
3192         int err;
3193
3194         do {
3195                 err = nfs4_handle_exception(server,
3196                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3197                                 &exception);
3198         } while (exception.retry);
3199         return err;
3200 }
3201
3202 void __nfs4_read_done_cb(struct nfs_read_data *data)
3203 {
3204         nfs_invalidate_atime(data->inode);
3205 }
3206
3207 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3208 {
3209         struct nfs_server *server = NFS_SERVER(data->inode);
3210
3211         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3212                 nfs_restart_rpc(task, server->nfs_client);
3213                 return -EAGAIN;
3214         }
3215
3216         __nfs4_read_done_cb(data);
3217         if (task->tk_status > 0)
3218                 renew_lease(server, data->timestamp);
3219         return 0;
3220 }
3221
3222 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3223 {
3224
3225         dprintk("--> %s\n", __func__);
3226
3227         if (!nfs4_sequence_done(task, &data->res.seq_res))
3228                 return -EAGAIN;
3229
3230         return data->read_done_cb ? data->read_done_cb(task, data) :
3231                                     nfs4_read_done_cb(task, data);
3232 }
3233
3234 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3235 {
3236         data->timestamp   = jiffies;
3237         data->read_done_cb = nfs4_read_done_cb;
3238         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3239 }
3240
3241 /* Reset the the nfs_read_data to send the read to the MDS. */
3242 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3243 {
3244         dprintk("%s Reset task for i/o through\n", __func__);
3245         put_lseg(data->lseg);
3246         data->lseg = NULL;
3247         /* offsets will differ in the dense stripe case */
3248         data->args.offset = data->mds_offset;
3249         data->ds_clp = NULL;
3250         data->args.fh     = NFS_FH(data->inode);
3251         data->read_done_cb = nfs4_read_done_cb;
3252         task->tk_ops = data->mds_ops;
3253         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3254 }
3255 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3256
3257 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3258 {
3259         struct inode *inode = data->inode;
3260
3261         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3262                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3263                 return -EAGAIN;
3264         }
3265         if (task->tk_status >= 0) {
3266                 renew_lease(NFS_SERVER(inode), data->timestamp);
3267                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3268         }
3269         return 0;
3270 }
3271
3272 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3273 {
3274         if (!nfs4_sequence_done(task, &data->res.seq_res))
3275                 return -EAGAIN;
3276         return data->write_done_cb ? data->write_done_cb(task, data) :
3277                 nfs4_write_done_cb(task, data);
3278 }
3279
3280 /* Reset the the nfs_write_data to send the write to the MDS. */
3281 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3282 {
3283         dprintk("%s Reset task for i/o through\n", __func__);
3284         put_lseg(data->lseg);
3285         data->lseg          = NULL;
3286         data->ds_clp        = NULL;
3287         data->write_done_cb = nfs4_write_done_cb;
3288         data->args.fh       = NFS_FH(data->inode);
3289         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3290         data->args.offset   = data->mds_offset;
3291         data->res.fattr     = &data->fattr;
3292         task->tk_ops        = data->mds_ops;
3293         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3294 }
3295 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3296
3297 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3298 {
3299         struct nfs_server *server = NFS_SERVER(data->inode);
3300
3301         if (data->lseg) {
3302                 data->args.bitmask = NULL;
3303                 data->res.fattr = NULL;
3304         } else
3305                 data->args.bitmask = server->cache_consistency_bitmask;
3306         if (!data->write_done_cb)
3307                 data->write_done_cb = nfs4_write_done_cb;
3308         data->res.server = server;
3309         data->timestamp   = jiffies;
3310
3311         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3312 }
3313
3314 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3315 {
3316         struct inode *inode = data->inode;
3317
3318         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3319                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3320                 return -EAGAIN;
3321         }
3322         nfs_refresh_inode(inode, data->res.fattr);
3323         return 0;
3324 }
3325
3326 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3327 {
3328         if (!nfs4_sequence_done(task, &data->res.seq_res))
3329                 return -EAGAIN;
3330         return data->write_done_cb(task, data);
3331 }
3332
3333 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3334 {
3335         struct nfs_server *server = NFS_SERVER(data->inode);
3336
3337         if (data->lseg) {
3338                 data->args.bitmask = NULL;
3339                 data->res.fattr = NULL;
3340         } else
3341                 data->args.bitmask = server->cache_consistency_bitmask;
3342         if (!data->write_done_cb)
3343                 data->write_done_cb = nfs4_commit_done_cb;
3344         data->res.server = server;
3345         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3346 }
3347
3348 struct nfs4_renewdata {
3349         struct nfs_client       *client;
3350         unsigned long           timestamp;
3351 };
3352
3353 /*
3354  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3355  * standalone procedure for queueing an asynchronous RENEW.
3356  */
3357 static void nfs4_renew_release(void *calldata)
3358 {
3359         struct nfs4_renewdata *data = calldata;
3360         struct nfs_client *clp = data->client;
3361
3362         if (atomic_read(&clp->cl_count) > 1)
3363                 nfs4_schedule_state_renewal(clp);
3364         nfs_put_client(clp);
3365         kfree(data);
3366 }
3367
3368 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3369 {
3370         struct nfs4_renewdata *data = calldata;
3371         struct nfs_client *clp = data->client;
3372         unsigned long timestamp = data->timestamp;
3373
3374         if (task->tk_status < 0) {
3375                 /* Unless we're shutting down, schedule state recovery! */
3376                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3377                         nfs4_schedule_lease_recovery(clp);
3378                 return;
3379         }
3380         do_renew_lease(clp, timestamp);
3381 }
3382
3383 static const struct rpc_call_ops nfs4_renew_ops = {
3384         .rpc_call_done = nfs4_renew_done,
3385         .rpc_release = nfs4_renew_release,
3386 };
3387
3388 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3389 {
3390         struct rpc_message msg = {
3391                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3392                 .rpc_argp       = clp,
3393                 .rpc_cred       = cred,
3394         };
3395         struct nfs4_renewdata *data;
3396
3397         if (!atomic_inc_not_zero(&clp->cl_count))
3398                 return -EIO;
3399         data = kmalloc(sizeof(*data), GFP_KERNEL);
3400         if (data == NULL)
3401                 return -ENOMEM;
3402         data->client = clp;
3403         data->timestamp = jiffies;
3404         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3405                         &nfs4_renew_ops, data);
3406 }
3407
3408 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3409 {
3410         struct rpc_message msg = {
3411                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3412                 .rpc_argp       = clp,
3413                 .rpc_cred       = cred,
3414         };
3415         unsigned long now = jiffies;
3416         int status;
3417
3418         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3419         if (status < 0)
3420                 return status;
3421         do_renew_lease(clp, now);
3422         return 0;
3423 }
3424
3425 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3426 {
3427         return (server->caps & NFS_CAP_ACLS)
3428                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3429                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3430 }
3431
3432 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3433  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3434  * the stack.
3435  */
3436 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3437
3438 static void buf_to_pages(const void *buf, size_t buflen,
3439                 struct page **pages, unsigned int *pgbase)
3440 {
3441         const void *p = buf;
3442
3443         *pgbase = offset_in_page(buf);
3444         p -= *pgbase;
3445         while (p < buf + buflen) {
3446                 *(pages++) = virt_to_page(p);
3447                 p += PAGE_CACHE_SIZE;
3448         }
3449 }
3450
3451 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3452                 struct page **pages, unsigned int *pgbase)
3453 {
3454         struct page *newpage, **spages;
3455         int rc = 0;
3456         size_t len;
3457         spages = pages;
3458
3459         do {
3460                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3461                 newpage = alloc_page(GFP_KERNEL);
3462
3463                 if (newpage == NULL)
3464                         goto unwind;
3465                 memcpy(page_address(newpage), buf, len);
3466                 buf += len;
3467                 buflen -= len;
3468                 *pages++ = newpage;
3469                 rc++;
3470         } while (buflen != 0);
3471
3472         return rc;
3473
3474 unwind:
3475         for(; rc > 0; rc--)
3476                 __free_page(spages[rc-1]);
3477         return -ENOMEM;
3478 }
3479
3480 struct nfs4_cached_acl {
3481         int cached;
3482         size_t len;
3483         char data[0];
3484 };
3485
3486 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3487 {
3488         struct nfs_inode *nfsi = NFS_I(inode);
3489
3490         spin_lock(&inode->i_lock);
3491         kfree(nfsi->nfs4_acl);
3492         nfsi->nfs4_acl = acl;
3493         spin_unlock(&inode->i_lock);
3494 }
3495
3496 static void nfs4_zap_acl_attr(struct inode *inode)
3497 {
3498         nfs4_set_cached_acl(inode, NULL);
3499 }
3500
3501 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3502 {
3503         struct nfs_inode *nfsi = NFS_I(inode);
3504         struct nfs4_cached_acl *acl;
3505         int ret = -ENOENT;
3506
3507         spin_lock(&inode->i_lock);
3508         acl = nfsi->nfs4_acl;
3509         if (acl == NULL)
3510                 goto out;
3511         if (buf == NULL) /* user is just asking for length */
3512                 goto out_len;
3513         if (acl->cached == 0)
3514                 goto out;
3515         ret = -ERANGE; /* see getxattr(2) man page */
3516         if (acl->len > buflen)
3517                 goto out;
3518         memcpy(buf, acl->data, acl->len);
3519 out_len:
3520         ret = acl->len;
3521 out:
3522         spin_unlock(&inode->i_lock);
3523         return ret;
3524 }
3525
3526 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3527 {
3528         struct nfs4_cached_acl *acl;
3529
3530         if (buf && acl_len <= PAGE_SIZE) {
3531                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3532                 if (acl == NULL)
3533                         goto out;
3534                 acl->cached = 1;
3535                 memcpy(acl->data, buf, acl_len);
3536         } else {
3537                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3538                 if (acl == NULL)
3539                         goto out;
3540                 acl->cached = 0;
3541         }
3542         acl->len = acl_len;
3543 out:
3544         nfs4_set_cached_acl(inode, acl);
3545 }
3546
3547 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3548 {
3549         struct page *pages[NFS4ACL_MAXPAGES];
3550         struct nfs_getaclargs args = {
3551                 .fh = NFS_FH(inode),
3552                 .acl_pages = pages,
3553                 .acl_len = buflen,
3554         };
3555         struct nfs_getaclres res = {
3556                 .acl_len = buflen,
3557         };
3558         void *resp_buf;
3559         struct rpc_message msg = {
3560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3561                 .rpc_argp = &args,
3562                 .rpc_resp = &res,
3563         };
3564         struct page *localpage = NULL;
3565         int ret;
3566
3567         if (buflen < PAGE_SIZE) {
3568                 /* As long as we're doing a round trip to the server anyway,
3569                  * let's be prepared for a page of acl data. */
3570                 localpage = alloc_page(GFP_KERNEL);
3571                 resp_buf = page_address(localpage);
3572                 if (localpage == NULL)
3573                         return -ENOMEM;
3574                 args.acl_pages[0] = localpage;
3575                 args.acl_pgbase = 0;
3576                 args.acl_len = PAGE_SIZE;
3577         } else {
3578                 resp_buf = buf;
3579                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3580         }
3581         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3582         if (ret)
3583                 goto out_free;
3584         if (res.acl_len > args.acl_len)
3585                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3586         else
3587                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3588         if (buf) {
3589                 ret = -ERANGE;
3590                 if (res.acl_len > buflen)
3591                         goto out_free;
3592                 if (localpage)
3593                         memcpy(buf, resp_buf, res.acl_len);
3594         }
3595         ret = res.acl_len;
3596 out_free:
3597         if (localpage)
3598                 __free_page(localpage);
3599         return ret;
3600 }
3601
3602 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3603 {
3604         struct nfs4_exception exception = { };
3605         ssize_t ret;
3606         do {
3607                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3608                 if (ret >= 0)
3609                         break;
3610                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3611         } while (exception.retry);
3612         return ret;
3613 }
3614
3615 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3616 {
3617         struct nfs_server *server = NFS_SERVER(inode);
3618         int ret;
3619
3620         if (!nfs4_server_supports_acls(server))
3621                 return -EOPNOTSUPP;
3622         ret = nfs_revalidate_inode(server, inode);
3623         if (ret < 0)
3624                 return ret;
3625         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3626                 nfs_zap_acl_cache(inode);
3627         ret = nfs4_read_cached_acl(inode, buf, buflen);
3628         if (ret != -ENOENT)
3629                 return ret;
3630         return nfs4_get_acl_uncached(inode, buf, buflen);
3631 }
3632
3633 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3634 {
3635         struct nfs_server *server = NFS_SERVER(inode);
3636         struct page *pages[NFS4ACL_MAXPAGES];
3637         struct nfs_setaclargs arg = {
3638                 .fh             = NFS_FH(inode),
3639                 .acl_pages      = pages,
3640                 .acl_len        = buflen,
3641         };
3642         struct nfs_setaclres res;
3643         struct rpc_message msg = {
3644                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3645                 .rpc_argp       = &arg,
3646                 .rpc_resp       = &res,
3647         };
3648         int ret, i;
3649
3650         if (!nfs4_server_supports_acls(server))
3651                 return -EOPNOTSUPP;
3652         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3653         if (i < 0)
3654                 return i;
3655         nfs_inode_return_delegation(inode);
3656         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3657
3658         /*
3659          * Free each page after tx, so the only ref left is
3660          * held by the network stack
3661          */
3662         for (; i > 0; i--)
3663                 put_page(pages[i-1]);
3664
3665         /*
3666          * Acl update can result in inode attribute update.
3667          * so mark the attribute cache invalid.
3668          */
3669         spin_lock(&inode->i_lock);
3670         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3671         spin_unlock(&inode->i_lock);
3672         nfs_access_zap_cache(inode);
3673         nfs_zap_acl_cache(inode);
3674         return ret;
3675 }
3676
3677 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3678 {
3679         struct nfs4_exception exception = { };
3680         int err;
3681         do {
3682                 err = nfs4_handle_exception(NFS_SERVER(inode),
3683                                 __nfs4_proc_set_acl(inode, buf, buflen),
3684                                 &exception);
3685         } while (exception.retry);
3686         return err;
3687 }
3688
3689 static int
3690 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3691 {
3692         struct nfs_client *clp = server->nfs_client;
3693
3694         if (task->tk_status >= 0)
3695                 return 0;
3696         switch(task->tk_status) {
3697                 case -NFS4ERR_ADMIN_REVOKED:
3698                 case -NFS4ERR_BAD_STATEID:
3699                 case -NFS4ERR_OPENMODE:
3700                         if (state == NULL)
3701                                 break;
3702                         nfs4_schedule_stateid_recovery(server, state);
3703                         goto wait_on_recovery;
3704                 case -NFS4ERR_EXPIRED:
3705                         if (state != NULL)
3706                                 nfs4_schedule_stateid_recovery(server, state);
3707                 case -NFS4ERR_STALE_STATEID:
3708                 case -NFS4ERR_STALE_CLIENTID:
3709                         nfs4_schedule_lease_recovery(clp);
3710                         goto wait_on_recovery;
3711 #if defined(CONFIG_NFS_V4_1)
3712                 case -NFS4ERR_BADSESSION:
3713                 case -NFS4ERR_BADSLOT:
3714                 case -NFS4ERR_BAD_HIGH_SLOT:
3715                 case -NFS4ERR_DEADSESSION:
3716                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3717                 case -NFS4ERR_SEQ_FALSE_RETRY:
3718                 case -NFS4ERR_SEQ_MISORDERED:
3719                         dprintk("%s ERROR %d, Reset session\n", __func__,
3720                                 task->tk_status);
3721                         nfs4_schedule_session_recovery(clp->cl_session);
3722                         task->tk_status = 0;
3723                         return -EAGAIN;
3724 #endif /* CONFIG_NFS_V4_1 */
3725                 case -NFS4ERR_DELAY:
3726                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3727                 case -NFS4ERR_GRACE:
3728                 case -EKEYEXPIRED:
3729                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3730                         task->tk_status = 0;
3731                         return -EAGAIN;
3732                 case -NFS4ERR_RETRY_UNCACHED_REP:
3733                 case -NFS4ERR_OLD_STATEID:
3734                         task->tk_status = 0;
3735                         return -EAGAIN;
3736         }
3737         task->tk_status = nfs4_map_errors(task->tk_status);
3738         return 0;
3739 wait_on_recovery:
3740         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3741         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3742                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3743         task->tk_status = 0;
3744         return -EAGAIN;
3745 }
3746
3747 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3748                 unsigned short port, struct rpc_cred *cred,
3749                 struct nfs4_setclientid_res *res)
3750 {
3751         nfs4_verifier sc_verifier;
3752         struct nfs4_setclientid setclientid = {
3753                 .sc_verifier = &sc_verifier,
3754                 .sc_prog = program,
3755                 .sc_cb_ident = clp->cl_cb_ident,
3756         };
3757         struct rpc_message msg = {
3758                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3759                 .rpc_argp = &setclientid,
3760                 .rpc_resp = res,
3761                 .rpc_cred = cred,
3762         };
3763         __be32 *p;
3764         int loop = 0;
3765         int status;
3766
3767         p = (__be32*)sc_verifier.data;
3768         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3769         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3770
3771         for(;;) {
3772                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3773                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3774                                 clp->cl_ipaddr,
3775                                 rpc_peeraddr2str(clp->cl_rpcclient,
3776                                                         RPC_DISPLAY_ADDR),
3777                                 rpc_peeraddr2str(clp->cl_rpcclient,
3778                                                         RPC_DISPLAY_PROTO),
3779                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3780                                 clp->cl_id_uniquifier);
3781                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3782                                 sizeof(setclientid.sc_netid),
3783                                 rpc_peeraddr2str(clp->cl_rpcclient,
3784                                                         RPC_DISPLAY_NETID));
3785                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3786                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3787                                 clp->cl_ipaddr, port >> 8, port & 255);
3788
3789                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3790                 if (status != -NFS4ERR_CLID_INUSE)
3791                         break;
3792                 if (loop != 0) {
3793                         ++clp->cl_id_uniquifier;
3794                         break;
3795                 }
3796                 ++loop;
3797                 ssleep(clp->cl_lease_time / HZ + 1);
3798         }
3799         return status;
3800 }
3801
3802 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3803                 struct nfs4_setclientid_res *arg,
3804                 struct rpc_cred *cred)
3805 {
3806         struct nfs_fsinfo fsinfo;
3807         struct rpc_message msg = {
3808                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3809                 .rpc_argp = arg,
3810                 .rpc_resp = &fsinfo,
3811                 .rpc_cred = cred,
3812         };
3813         unsigned long now;
3814         int status;
3815
3816         now = jiffies;
3817         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3818         if (status == 0) {
3819                 spin_lock(&clp->cl_lock);
3820                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3821                 clp->cl_last_renewal = now;
3822                 spin_unlock(&clp->cl_lock);
3823         }
3824         return status;
3825 }
3826
3827 struct nfs4_delegreturndata {
3828         struct nfs4_delegreturnargs args;
3829         struct nfs4_delegreturnres res;
3830         struct nfs_fh fh;
3831         nfs4_stateid stateid;
3832         unsigned long timestamp;
3833         struct nfs_fattr fattr;
3834         int rpc_status;
3835 };
3836
3837 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3838 {
3839         struct nfs4_delegreturndata *data = calldata;
3840
3841         if (!nfs4_sequence_done(task, &data->res.seq_res))
3842                 return;
3843
3844         switch (task->tk_status) {
3845         case -NFS4ERR_STALE_STATEID:
3846         case -NFS4ERR_EXPIRED:
3847         case 0:
3848                 renew_lease(data->res.server, data->timestamp);
3849                 break;
3850         default:
3851                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3852                                 -EAGAIN) {
3853                         nfs_restart_rpc(task, data->res.server->nfs_client);
3854                         return;
3855                 }
3856         }
3857         data->rpc_status = task->tk_status;
3858 }
3859
3860 static void nfs4_delegreturn_release(void *calldata)
3861 {
3862         kfree(calldata);
3863 }
3864
3865 #if defined(CONFIG_NFS_V4_1)
3866 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3867 {
3868         struct nfs4_delegreturndata *d_data;
3869
3870         d_data = (struct nfs4_delegreturndata *)data;
3871
3872         if (nfs4_setup_sequence(d_data->res.server,
3873                                 &d_data->args.seq_args,
3874                                 &d_data->res.seq_res, 1, task))
3875                 return;
3876         rpc_call_start(task);
3877 }
3878 #endif /* CONFIG_NFS_V4_1 */
3879
3880 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3881 #if defined(CONFIG_NFS_V4_1)
3882         .rpc_call_prepare = nfs4_delegreturn_prepare,
3883 #endif /* CONFIG_NFS_V4_1 */
3884         .rpc_call_done = nfs4_delegreturn_done,
3885         .rpc_release = nfs4_delegreturn_release,
3886 };
3887
3888 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3889 {
3890         struct nfs4_delegreturndata *data;
3891         struct nfs_server *server = NFS_SERVER(inode);
3892         struct rpc_task *task;
3893         struct rpc_message msg = {
3894                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3895                 .rpc_cred = cred,
3896         };
3897         struct rpc_task_setup task_setup_data = {
3898                 .rpc_client = server->client,
3899                 .rpc_message = &msg,
3900                 .callback_ops = &nfs4_delegreturn_ops,
3901                 .flags = RPC_TASK_ASYNC,
3902         };
3903         int status = 0;
3904
3905         data = kzalloc(sizeof(*data), GFP_NOFS);
3906         if (data == NULL)
3907                 return -ENOMEM;
3908         data->args.fhandle = &data->fh;
3909         data->args.stateid = &data->stateid;
3910         data->args.bitmask = server->attr_bitmask;
3911         nfs_copy_fh(&data->fh, NFS_FH(inode));
3912         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3913         data->res.fattr = &data->fattr;
3914         data->res.server = server;
3915         nfs_fattr_init(data->res.fattr);
3916         data->timestamp = jiffies;
3917         data->rpc_status = 0;
3918
3919         task_setup_data.callback_data = data;
3920         msg.rpc_argp = &data->args;
3921         msg.rpc_resp = &data->res;
3922         task = rpc_run_task(&task_setup_data);
3923         if (IS_ERR(task))
3924                 return PTR_ERR(task);
3925         if (!issync)
3926                 goto out;
3927         status = nfs4_wait_for_completion_rpc_task(task);
3928         if (status != 0)
3929                 goto out;
3930         status = data->rpc_status;
3931         if (status != 0)
3932                 goto out;
3933         nfs_refresh_inode(inode, &data->fattr);
3934 out:
3935         rpc_put_task(task);
3936         return status;
3937 }
3938
3939 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3940 {
3941         struct nfs_server *server = NFS_SERVER(inode);
3942         struct nfs4_exception exception = { };
3943         int err;
3944         do {
3945                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3946                 switch (err) {
3947                         case -NFS4ERR_STALE_STATEID:
3948                         case -NFS4ERR_EXPIRED:
3949                         case 0:
3950                                 return 0;
3951                 }
3952                 err = nfs4_handle_exception(server, err, &exception);
3953         } while (exception.retry);
3954         return err;
3955 }
3956
3957 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3958 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3959
3960 /*
3961  * sleep, with exponential backoff, and retry the LOCK operation.
3962  */
3963 static unsigned long
3964 nfs4_set_lock_task_retry(unsigned long timeout)
3965 {
3966         schedule_timeout_killable(timeout);
3967         timeout <<= 1;
3968         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3969                 return NFS4_LOCK_MAXTIMEOUT;
3970         return timeout;
3971 }
3972
3973 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3974 {
3975         struct inode *inode = state->inode;
3976         struct nfs_server *server = NFS_SERVER(inode);
3977         struct nfs_client *clp = server->nfs_client;
3978         struct nfs_lockt_args arg = {
3979                 .fh = NFS_FH(inode),
3980                 .fl = request,
3981         };
3982         struct nfs_lockt_res res = {
3983                 .denied = request,
3984         };
3985         struct rpc_message msg = {
3986                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3987                 .rpc_argp       = &arg,
3988                 .rpc_resp       = &res,
3989                 .rpc_cred       = state->owner->so_cred,
3990         };
3991         struct nfs4_lock_state *lsp;
3992         int status;
3993
3994         arg.lock_owner.clientid = clp->cl_clientid;
3995         status = nfs4_set_lock_state(state, request);
3996         if (status != 0)
3997                 goto out;
3998         lsp = request->fl_u.nfs4_fl.owner;
3999         arg.lock_owner.id = lsp->ls_id.id;
4000         arg.lock_owner.s_dev = server->s_dev;
4001         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4002         switch (status) {
4003                 case 0:
4004                         request->fl_type = F_UNLCK;
4005                         break;
4006                 case -NFS4ERR_DENIED:
4007                         status = 0;
4008         }
4009         request->fl_ops->fl_release_private(request);
4010 out:
4011         return status;
4012 }
4013
4014 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4015 {
4016         struct nfs4_exception exception = { };
4017         int err;
4018
4019         do {
4020                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4021                                 _nfs4_proc_getlk(state, cmd, request),
4022                                 &exception);
4023         } while (exception.retry);
4024         return err;
4025 }
4026
4027 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4028 {
4029         int res = 0;
4030         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4031                 case FL_POSIX:
4032                         res = posix_lock_file_wait(file, fl);
4033                         break;
4034                 case FL_FLOCK:
4035                         res = flock_lock_file_wait(file, fl);
4036                         break;
4037                 default:
4038                         BUG();
4039         }
4040         return res;
4041 }
4042
4043 struct nfs4_unlockdata {
4044         struct nfs_locku_args arg;
4045         struct nfs_locku_res res;
4046         struct nfs4_lock_state *lsp;
4047         struct nfs_open_context *ctx;
4048         struct file_lock fl;
4049         const struct nfs_server *server;
4050         unsigned long timestamp;
4051 };
4052
4053 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4054                 struct nfs_open_context *ctx,
4055                 struct nfs4_lock_state *lsp,
4056                 struct nfs_seqid *seqid)
4057 {
4058         struct nfs4_unlockdata *p;
4059         struct inode *inode = lsp->ls_state->inode;
4060
4061         p = kzalloc(sizeof(*p), GFP_NOFS);
4062         if (p == NULL)
4063                 return NULL;
4064         p->arg.fh = NFS_FH(inode);
4065         p->arg.fl = &p->fl;
4066         p->arg.seqid = seqid;
4067         p->res.seqid = seqid;
4068         p->arg.stateid = &lsp->ls_stateid;
4069         p->lsp = lsp;
4070         atomic_inc(&lsp->ls_count);
4071         /* Ensure we don't close file until we're done freeing locks! */
4072         p->ctx = get_nfs_open_context(ctx);
4073         memcpy(&p->fl, fl, sizeof(p->fl));
4074         p->server = NFS_SERVER(inode);
4075         return p;
4076 }
4077
4078 static void nfs4_locku_release_calldata(void *data)
4079 {
4080         struct nfs4_unlockdata *calldata = data;
4081         nfs_free_seqid(calldata->arg.seqid);
4082         nfs4_put_lock_state(calldata->lsp);
4083         put_nfs_open_context(calldata->ctx);
4084         kfree(calldata);
4085 }
4086
4087 static void nfs4_locku_done(struct rpc_task *task, void *data)
4088 {
4089         struct nfs4_unlockdata *calldata = data;
4090
4091         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4092                 return;
4093         switch (task->tk_status) {
4094                 case 0:
4095                         memcpy(calldata->lsp->ls_stateid.data,
4096                                         calldata->res.stateid.data,
4097                                         sizeof(calldata->lsp->ls_stateid.data));
4098                         renew_lease(calldata->server, calldata->timestamp);
4099                         break;
4100                 case -NFS4ERR_BAD_STATEID:
4101                 case -NFS4ERR_OLD_STATEID:
4102                 case -NFS4ERR_STALE_STATEID:
4103                 case -NFS4ERR_EXPIRED:
4104                         break;
4105                 default:
4106                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4107                                 nfs_restart_rpc(task,
4108                                                  calldata->server->nfs_client);
4109         }
4110 }
4111
4112 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4113 {
4114         struct nfs4_unlockdata *calldata = data;
4115
4116         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4117                 return;
4118         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4119                 /* Note: exit _without_ running nfs4_locku_done */
4120                 task->tk_action = NULL;
4121                 return;
4122         }
4123         calldata->timestamp = jiffies;
4124         if (nfs4_setup_sequence(calldata->server,
4125                                 &calldata->arg.seq_args,
4126                                 &calldata->res.seq_res, 1, task))
4127                 return;
4128         rpc_call_start(task);
4129 }
4130
4131 static const struct rpc_call_ops nfs4_locku_ops = {
4132         .rpc_call_prepare = nfs4_locku_prepare,
4133         .rpc_call_done = nfs4_locku_done,
4134         .rpc_release = nfs4_locku_release_calldata,
4135 };
4136
4137 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4138                 struct nfs_open_context *ctx,
4139                 struct nfs4_lock_state *lsp,
4140                 struct nfs_seqid *seqid)
4141 {
4142         struct nfs4_unlockdata *data;
4143         struct rpc_message msg = {
4144                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4145                 .rpc_cred = ctx->cred,
4146         };
4147         struct rpc_task_setup task_setup_data = {
4148                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4149                 .rpc_message = &msg,
4150                 .callback_ops = &nfs4_locku_ops,
4151                 .workqueue = nfsiod_workqueue,
4152                 .flags = RPC_TASK_ASYNC,
4153         };
4154
4155         /* Ensure this is an unlock - when canceling a lock, the
4156          * canceled lock is passed in, and it won't be an unlock.
4157          */
4158         fl->fl_type = F_UNLCK;
4159
4160         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4161         if (data == NULL) {
4162                 nfs_free_seqid(seqid);
4163                 return ERR_PTR(-ENOMEM);
4164         }
4165
4166         msg.rpc_argp = &data->arg;
4167         msg.rpc_resp = &data->res;
4168         task_setup_data.callback_data = data;
4169         return rpc_run_task(&task_setup_data);
4170 }
4171
4172 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4173 {
4174         struct nfs_inode *nfsi = NFS_I(state->inode);
4175         struct nfs_seqid *seqid;
4176         struct nfs4_lock_state *lsp;
4177         struct rpc_task *task;
4178         int status = 0;
4179         unsigned char fl_flags = request->fl_flags;
4180
4181         status = nfs4_set_lock_state(state, request);
4182         /* Unlock _before_ we do the RPC call */
4183         request->fl_flags |= FL_EXISTS;
4184         down_read(&nfsi->rwsem);
4185         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4186                 up_read(&nfsi->rwsem);
4187                 goto out;
4188         }
4189         up_read(&nfsi->rwsem);
4190         if (status != 0)
4191                 goto out;
4192         /* Is this a delegated lock? */
4193         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4194                 goto out;
4195         lsp = request->fl_u.nfs4_fl.owner;
4196         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4197         status = -ENOMEM;
4198         if (seqid == NULL)
4199                 goto out;
4200         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4201         status = PTR_ERR(task);
4202         if (IS_ERR(task))
4203                 goto out;
4204         status = nfs4_wait_for_completion_rpc_task(task);
4205         rpc_put_task(task);
4206 out:
4207         request->fl_flags = fl_flags;
4208         return status;
4209 }
4210
4211 struct nfs4_lockdata {
4212         struct nfs_lock_args arg;
4213         struct nfs_lock_res res;
4214         struct nfs4_lock_state *lsp;
4215         struct nfs_open_context *ctx;
4216         struct file_lock fl;
4217         unsigned long timestamp;
4218         int rpc_status;
4219         int cancelled;
4220         struct nfs_server *server;
4221 };
4222
4223 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4224                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4225                 gfp_t gfp_mask)
4226 {
4227         struct nfs4_lockdata *p;
4228         struct inode *inode = lsp->ls_state->inode;
4229         struct nfs_server *server = NFS_SERVER(inode);
4230
4231         p = kzalloc(sizeof(*p), gfp_mask);
4232         if (p == NULL)
4233                 return NULL;
4234
4235         p->arg.fh = NFS_FH(inode);
4236         p->arg.fl = &p->fl;
4237         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4238         if (p->arg.open_seqid == NULL)
4239                 goto out_free;
4240         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4241         if (p->arg.lock_seqid == NULL)
4242                 goto out_free_seqid;
4243         p->arg.lock_stateid = &lsp->ls_stateid;
4244         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4245         p->arg.lock_owner.id = lsp->ls_id.id;
4246         p->arg.lock_owner.s_dev = server->s_dev;
4247         p->res.lock_seqid = p->arg.lock_seqid;
4248         p->lsp = lsp;
4249         p->server = server;
4250         atomic_inc(&lsp->ls_count);
4251         p->ctx = get_nfs_open_context(ctx);
4252         memcpy(&p->fl, fl, sizeof(p->fl));
4253         return p;
4254 out_free_seqid:
4255         nfs_free_seqid(p->arg.open_seqid);
4256 out_free:
4257         kfree(p);
4258         return NULL;
4259 }
4260
4261 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4262 {
4263         struct nfs4_lockdata *data = calldata;
4264         struct nfs4_state *state = data->lsp->ls_state;
4265
4266         dprintk("%s: begin!\n", __func__);
4267         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4268                 return;
4269         /* Do we need to do an open_to_lock_owner? */
4270         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4271                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4272                         return;
4273                 data->arg.open_stateid = &state->stateid;
4274                 data->arg.new_lock_owner = 1;
4275                 data->res.open_seqid = data->arg.open_seqid;
4276         } else
4277                 data->arg.new_lock_owner = 0;
4278         data->timestamp = jiffies;
4279         if (nfs4_setup_sequence(data->server,
4280                                 &data->arg.seq_args,
4281                                 &data->res.seq_res, 1, task))
4282                 return;
4283         rpc_call_start(task);
4284         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4285 }
4286
4287 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4288 {
4289         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4290         nfs4_lock_prepare(task, calldata);
4291 }
4292
4293 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4294 {
4295         struct nfs4_lockdata *data = calldata;
4296
4297         dprintk("%s: begin!\n", __func__);
4298
4299         if (!nfs4_sequence_done(task, &data->res.seq_res))
4300                 return;
4301
4302         data->rpc_status = task->tk_status;
4303         if (data->arg.new_lock_owner != 0) {
4304                 if (data->rpc_status == 0)
4305                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4306                 else
4307                         goto out;
4308         }
4309         if (data->rpc_status == 0) {
4310                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4311                                         sizeof(data->lsp->ls_stateid.data));
4312                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4313                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4314         }
4315 out:
4316         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4317 }
4318
4319 static void nfs4_lock_release(void *calldata)
4320 {
4321         struct nfs4_lockdata *data = calldata;
4322
4323         dprintk("%s: begin!\n", __func__);
4324         nfs_free_seqid(data->arg.open_seqid);
4325         if (data->cancelled != 0) {
4326                 struct rpc_task *task;
4327                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4328                                 data->arg.lock_seqid);
4329                 if (!IS_ERR(task))
4330                         rpc_put_task_async(task);
4331                 dprintk("%s: cancelling lock!\n", __func__);
4332         } else
4333                 nfs_free_seqid(data->arg.lock_seqid);
4334         nfs4_put_lock_state(data->lsp);
4335         put_nfs_open_context(data->ctx);
4336         kfree(data);
4337         dprintk("%s: done!\n", __func__);
4338 }
4339
4340 static const struct rpc_call_ops nfs4_lock_ops = {
4341         .rpc_call_prepare = nfs4_lock_prepare,
4342         .rpc_call_done = nfs4_lock_done,
4343         .rpc_release = nfs4_lock_release,
4344 };
4345
4346 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4347         .rpc_call_prepare = nfs4_recover_lock_prepare,
4348         .rpc_call_done = nfs4_lock_done,
4349         .rpc_release = nfs4_lock_release,
4350 };
4351
4352 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4353 {
4354         switch (error) {
4355         case -NFS4ERR_ADMIN_REVOKED:
4356         case -NFS4ERR_BAD_STATEID:
4357                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4358                 if (new_lock_owner != 0 ||
4359                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4360                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4361                 break;
4362         case -NFS4ERR_STALE_STATEID:
4363                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4364         case -NFS4ERR_EXPIRED:
4365                 nfs4_schedule_lease_recovery(server->nfs_client);
4366         };
4367 }
4368
4369 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4370 {
4371         struct nfs4_lockdata *data;
4372         struct rpc_task *task;
4373         struct rpc_message msg = {
4374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4375                 .rpc_cred = state->owner->so_cred,
4376         };
4377         struct rpc_task_setup task_setup_data = {
4378                 .rpc_client = NFS_CLIENT(state->inode),
4379                 .rpc_message = &msg,
4380                 .callback_ops = &nfs4_lock_ops,
4381                 .workqueue = nfsiod_workqueue,
4382                 .flags = RPC_TASK_ASYNC,
4383         };
4384         int ret;
4385
4386         dprintk("%s: begin!\n", __func__);
4387         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4388                         fl->fl_u.nfs4_fl.owner,
4389                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4390         if (data == NULL)
4391                 return -ENOMEM;
4392         if (IS_SETLKW(cmd))
4393                 data->arg.block = 1;
4394         if (recovery_type > NFS_LOCK_NEW) {
4395                 if (recovery_type == NFS_LOCK_RECLAIM)
4396                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4397                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4398         }
4399         msg.rpc_argp = &data->arg;
4400         msg.rpc_resp = &data->res;
4401         task_setup_data.callback_data = data;
4402         task = rpc_run_task(&task_setup_data);
4403         if (IS_ERR(task))
4404                 return PTR_ERR(task);
4405         ret = nfs4_wait_for_completion_rpc_task(task);
4406         if (ret == 0) {
4407                 ret = data->rpc_status;
4408                 if (ret)
4409                         nfs4_handle_setlk_error(data->server, data->lsp,
4410                                         data->arg.new_lock_owner, ret);
4411         } else
4412                 data->cancelled = 1;
4413         rpc_put_task(task);
4414         dprintk("%s: done, ret = %d!\n", __func__, ret);
4415         return ret;
4416 }
4417
4418 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4419 {
4420         struct nfs_server *server = NFS_SERVER(state->inode);
4421         struct nfs4_exception exception = { };
4422         int err;
4423
4424         do {
4425                 /* Cache the lock if possible... */
4426                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4427                         return 0;
4428                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4429                 if (err != -NFS4ERR_DELAY)
4430                         break;
4431                 nfs4_handle_exception(server, err, &exception);
4432         } while (exception.retry);
4433         return err;
4434 }
4435
4436 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4437 {
4438         struct nfs_server *server = NFS_SERVER(state->inode);
4439         struct nfs4_exception exception = { };
4440         int err;
4441
4442         err = nfs4_set_lock_state(state, request);
4443         if (err != 0)
4444                 return err;
4445         do {
4446                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4447                         return 0;
4448                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4449                 switch (err) {
4450                 default:
4451                         goto out;
4452                 case -NFS4ERR_GRACE:
4453                 case -NFS4ERR_DELAY:
4454                         nfs4_handle_exception(server, err, &exception);
4455                         err = 0;
4456                 }
4457         } while (exception.retry);
4458 out:
4459         return err;
4460 }
4461
4462 #if defined(CONFIG_NFS_V4_1)
4463 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4464 {
4465         int status;
4466         struct nfs_server *server = NFS_SERVER(state->inode);
4467
4468         status = nfs41_test_stateid(server, state);
4469         if (status == NFS_OK)
4470                 return 0;
4471         nfs41_free_stateid(server, state);
4472         return nfs4_lock_expired(state, request);
4473 }
4474 #endif
4475
4476 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4477 {
4478         struct nfs_inode *nfsi = NFS_I(state->inode);
4479         unsigned char fl_flags = request->fl_flags;
4480         int status = -ENOLCK;
4481
4482         if ((fl_flags & FL_POSIX) &&
4483                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4484                 goto out;
4485         /* Is this a delegated open? */
4486         status = nfs4_set_lock_state(state, request);
4487         if (status != 0)
4488                 goto out;
4489         request->fl_flags |= FL_ACCESS;
4490         status = do_vfs_lock(request->fl_file, request);
4491         if (status < 0)
4492                 goto out;
4493         down_read(&nfsi->rwsem);
4494         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4495                 /* Yes: cache locks! */
4496                 /* ...but avoid races with delegation recall... */
4497                 request->fl_flags = fl_flags & ~FL_SLEEP;
4498                 status = do_vfs_lock(request->fl_file, request);
4499                 goto out_unlock;
4500         }
4501         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4502         if (status != 0)
4503                 goto out_unlock;
4504         /* Note: we always want to sleep here! */
4505         request->fl_flags = fl_flags | FL_SLEEP;
4506         if (do_vfs_lock(request->fl_file, request) < 0)
4507                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4508 out_unlock:
4509         up_read(&nfsi->rwsem);
4510 out:
4511         request->fl_flags = fl_flags;
4512         return status;
4513 }
4514
4515 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4516 {
4517         struct nfs4_exception exception = { };
4518         int err;
4519
4520         do {
4521                 err = _nfs4_proc_setlk(state, cmd, request);
4522                 if (err == -NFS4ERR_DENIED)
4523                         err = -EAGAIN;
4524                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4525                                 err, &exception);
4526         } while (exception.retry);
4527         return err;
4528 }
4529
4530 static int
4531 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4532 {
4533         struct nfs_open_context *ctx;
4534         struct nfs4_state *state;
4535         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4536         int status;
4537
4538         /* verify open state */
4539         ctx = nfs_file_open_context(filp);
4540         state = ctx->state;
4541
4542         if (request->fl_start < 0 || request->fl_end < 0)
4543                 return -EINVAL;
4544
4545         if (IS_GETLK(cmd)) {
4546                 if (state != NULL)
4547                         return nfs4_proc_getlk(state, F_GETLK, request);
4548                 return 0;
4549         }
4550
4551         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4552                 return -EINVAL;
4553
4554         if (request->fl_type == F_UNLCK) {
4555                 if (state != NULL)
4556                         return nfs4_proc_unlck(state, cmd, request);
4557                 return 0;
4558         }
4559
4560         if (state == NULL)
4561                 return -ENOLCK;
4562         do {
4563                 status = nfs4_proc_setlk(state, cmd, request);
4564                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4565                         break;
4566                 timeout = nfs4_set_lock_task_retry(timeout);
4567                 status = -ERESTARTSYS;
4568                 if (signalled())
4569                         break;
4570         } while(status < 0);
4571         return status;
4572 }
4573
4574 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4575 {
4576         struct nfs_server *server = NFS_SERVER(state->inode);
4577         struct nfs4_exception exception = { };
4578         int err;
4579
4580         err = nfs4_set_lock_state(state, fl);
4581         if (err != 0)
4582                 goto out;
4583         do {
4584                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4585                 switch (err) {
4586                         default:
4587                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4588                                                 __func__, err);
4589                         case 0:
4590                         case -ESTALE:
4591                                 goto out;
4592                         case -NFS4ERR_EXPIRED:
4593                                 nfs4_schedule_stateid_recovery(server, state);
4594                         case -NFS4ERR_STALE_CLIENTID:
4595                         case -NFS4ERR_STALE_STATEID:
4596                                 nfs4_schedule_lease_recovery(server->nfs_client);
4597                                 goto out;
4598                         case -NFS4ERR_BADSESSION:
4599                         case -NFS4ERR_BADSLOT:
4600                         case -NFS4ERR_BAD_HIGH_SLOT:
4601                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4602                         case -NFS4ERR_DEADSESSION:
4603                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4604                                 goto out;
4605                         case -ERESTARTSYS:
4606                                 /*
4607                                  * The show must go on: exit, but mark the
4608                                  * stateid as needing recovery.
4609                                  */
4610                         case -NFS4ERR_ADMIN_REVOKED:
4611                         case -NFS4ERR_BAD_STATEID:
4612                         case -NFS4ERR_OPENMODE:
4613                                 nfs4_schedule_stateid_recovery(server, state);
4614                                 err = 0;
4615                                 goto out;
4616                         case -EKEYEXPIRED:
4617                                 /*
4618                                  * User RPCSEC_GSS context has expired.
4619                                  * We cannot recover this stateid now, so
4620                                  * skip it and allow recovery thread to
4621                                  * proceed.
4622                                  */
4623                                 err = 0;
4624                                 goto out;
4625                         case -ENOMEM:
4626                         case -NFS4ERR_DENIED:
4627                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4628                                 err = 0;
4629                                 goto out;
4630                         case -NFS4ERR_DELAY:
4631                                 break;
4632                 }
4633                 err = nfs4_handle_exception(server, err, &exception);
4634         } while (exception.retry);
4635 out:
4636         return err;
4637 }
4638
4639 static void nfs4_release_lockowner_release(void *calldata)
4640 {
4641         kfree(calldata);
4642 }
4643
4644 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4645         .rpc_release = nfs4_release_lockowner_release,
4646 };
4647
4648 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4649 {
4650         struct nfs_server *server = lsp->ls_state->owner->so_server;
4651         struct nfs_release_lockowner_args *args;
4652         struct rpc_message msg = {
4653                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4654         };
4655
4656         if (server->nfs_client->cl_mvops->minor_version != 0)
4657                 return;
4658         args = kmalloc(sizeof(*args), GFP_NOFS);
4659         if (!args)
4660                 return;
4661         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4662         args->lock_owner.id = lsp->ls_id.id;
4663         args->lock_owner.s_dev = server->s_dev;
4664         msg.rpc_argp = args;
4665         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4666 }
4667
4668 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4669
4670 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4671                                    const void *buf, size_t buflen,
4672                                    int flags, int type)
4673 {
4674         if (strcmp(key, "") != 0)
4675                 return -EINVAL;
4676
4677         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4678 }
4679
4680 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4681                                    void *buf, size_t buflen, int type)
4682 {
4683         if (strcmp(key, "") != 0)
4684                 return -EINVAL;
4685
4686         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4687 }
4688
4689 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4690                                        size_t list_len, const char *name,
4691                                        size_t name_len, int type)
4692 {
4693         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4694
4695         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4696                 return 0;
4697
4698         if (list && len <= list_len)
4699                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4700         return len;
4701 }
4702
4703 /*
4704  * nfs_fhget will use either the mounted_on_fileid or the fileid
4705  */
4706 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4707 {
4708         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4709                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4710               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4711               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4712                 return;
4713
4714         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4715                 NFS_ATTR_FATTR_NLINK;
4716         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4717         fattr->nlink = 2;
4718 }
4719
4720 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4721                 struct nfs4_fs_locations *fs_locations, struct page *page)
4722 {
4723         struct nfs_server *server = NFS_SERVER(dir);
4724         u32 bitmask[2] = {
4725                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4726         };
4727         struct nfs4_fs_locations_arg args = {
4728                 .dir_fh = NFS_FH(dir),
4729                 .name = name,
4730                 .page = page,
4731                 .bitmask = bitmask,
4732         };
4733         struct nfs4_fs_locations_res res = {
4734                 .fs_locations = fs_locations,
4735         };
4736         struct rpc_message msg = {
4737                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4738                 .rpc_argp = &args,
4739                 .rpc_resp = &res,
4740         };
4741         int status;
4742
4743         dprintk("%s: start\n", __func__);
4744
4745         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4746          * is not supported */
4747         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4748                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4749         else
4750                 bitmask[0] |= FATTR4_WORD0_FILEID;
4751
4752         nfs_fattr_init(&fs_locations->fattr);
4753         fs_locations->server = server;
4754         fs_locations->nlocations = 0;
4755         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4756         dprintk("%s: returned status = %d\n", __func__, status);
4757         return status;
4758 }
4759
4760 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4761 {
4762         int status;
4763         struct nfs4_secinfo_arg args = {
4764                 .dir_fh = NFS_FH(dir),
4765                 .name   = name,
4766         };
4767         struct nfs4_secinfo_res res = {
4768                 .flavors     = flavors,
4769         };
4770         struct rpc_message msg = {
4771                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4772                 .rpc_argp = &args,
4773                 .rpc_resp = &res,
4774         };
4775
4776         dprintk("NFS call  secinfo %s\n", name->name);
4777         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4778         dprintk("NFS reply  secinfo: %d\n", status);
4779         return status;
4780 }
4781
4782 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4783 {
4784         struct nfs4_exception exception = { };
4785         int err;
4786         do {
4787                 err = nfs4_handle_exception(NFS_SERVER(dir),
4788                                 _nfs4_proc_secinfo(dir, name, flavors),
4789                                 &exception);
4790         } while (exception.retry);
4791         return err;
4792 }
4793
4794 #ifdef CONFIG_NFS_V4_1
4795 /*
4796  * Check the exchange flags returned by the server for invalid flags, having
4797  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4798  * DS flags set.
4799  */
4800 static int nfs4_check_cl_exchange_flags(u32 flags)
4801 {
4802         if (flags & ~EXCHGID4_FLAG_MASK_R)
4803                 goto out_inval;
4804         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4805             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4806                 goto out_inval;
4807         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4808                 goto out_inval;
4809         return NFS_OK;
4810 out_inval:
4811         return -NFS4ERR_INVAL;
4812 }
4813
4814 static bool
4815 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4816 {
4817         if (a->server_scope_sz == b->server_scope_sz &&
4818             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4819                 return true;
4820
4821         return false;
4822 }
4823
4824 /*
4825  * nfs4_proc_exchange_id()
4826  *
4827  * Since the clientid has expired, all compounds using sessions
4828  * associated with the stale clientid will be returning
4829  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4830  * be in some phase of session reset.
4831  */
4832 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4833 {
4834         nfs4_verifier verifier;
4835         struct nfs41_exchange_id_args args = {
4836                 .client = clp,
4837                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4838         };
4839         struct nfs41_exchange_id_res res = {
4840                 .client = clp,
4841         };
4842         int status;
4843         struct rpc_message msg = {
4844                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4845                 .rpc_argp = &args,
4846                 .rpc_resp = &res,
4847                 .rpc_cred = cred,
4848         };
4849         __be32 *p;
4850
4851         dprintk("--> %s\n", __func__);
4852         BUG_ON(clp == NULL);
4853
4854         p = (u32 *)verifier.data;
4855         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4856         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4857         args.verifier = &verifier;
4858
4859         args.id_len = scnprintf(args.id, sizeof(args.id),
4860                                 "%s/%s.%s/%u",
4861                                 clp->cl_ipaddr,
4862                                 init_utsname()->nodename,
4863                                 init_utsname()->domainname,
4864                                 clp->cl_rpcclient->cl_auth->au_flavor);
4865
4866         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4867         if (unlikely(!res.server_scope))
4868                 return -ENOMEM;
4869
4870         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4871         if (!status)
4872                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4873
4874         if (!status) {
4875                 if (clp->server_scope &&
4876                     !nfs41_same_server_scope(clp->server_scope,
4877                                              res.server_scope)) {
4878                         dprintk("%s: server_scope mismatch detected\n",
4879                                 __func__);
4880                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4881                         kfree(clp->server_scope);
4882                         clp->server_scope = NULL;
4883                 }
4884
4885                 if (!clp->server_scope)
4886                         clp->server_scope = res.server_scope;
4887                 else
4888                         kfree(res.server_scope);
4889         }
4890
4891         dprintk("<-- %s status= %d\n", __func__, status);
4892         return status;
4893 }
4894
4895 struct nfs4_get_lease_time_data {
4896         struct nfs4_get_lease_time_args *args;
4897         struct nfs4_get_lease_time_res *res;
4898         struct nfs_client *clp;
4899 };
4900
4901 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4902                                         void *calldata)
4903 {
4904         int ret;
4905         struct nfs4_get_lease_time_data *data =
4906                         (struct nfs4_get_lease_time_data *)calldata;
4907
4908         dprintk("--> %s\n", __func__);
4909         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4910         /* just setup sequence, do not trigger session recovery
4911            since we're invoked within one */
4912         ret = nfs41_setup_sequence(data->clp->cl_session,
4913                                    &data->args->la_seq_args,
4914                                    &data->res->lr_seq_res, 0, task);
4915
4916         BUG_ON(ret == -EAGAIN);
4917         rpc_call_start(task);
4918         dprintk("<-- %s\n", __func__);
4919 }
4920
4921 /*
4922  * Called from nfs4_state_manager thread for session setup, so don't recover
4923  * from sequence operation or clientid errors.
4924  */
4925 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4926 {
4927         struct nfs4_get_lease_time_data *data =
4928                         (struct nfs4_get_lease_time_data *)calldata;
4929
4930         dprintk("--> %s\n", __func__);
4931         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4932                 return;
4933         switch (task->tk_status) {
4934         case -NFS4ERR_DELAY:
4935         case -NFS4ERR_GRACE:
4936                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4937                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4938                 task->tk_status = 0;
4939                 /* fall through */
4940         case -NFS4ERR_RETRY_UNCACHED_REP:
4941                 nfs_restart_rpc(task, data->clp);
4942                 return;
4943         }
4944         dprintk("<-- %s\n", __func__);
4945 }
4946
4947 struct rpc_call_ops nfs4_get_lease_time_ops = {
4948         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4949         .rpc_call_done = nfs4_get_lease_time_done,
4950 };
4951
4952 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4953 {
4954         struct rpc_task *task;
4955         struct nfs4_get_lease_time_args args;
4956         struct nfs4_get_lease_time_res res = {
4957                 .lr_fsinfo = fsinfo,
4958         };
4959         struct nfs4_get_lease_time_data data = {
4960                 .args = &args,
4961                 .res = &res,
4962                 .clp = clp,
4963         };
4964         struct rpc_message msg = {
4965                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4966                 .rpc_argp = &args,
4967                 .rpc_resp = &res,
4968         };
4969         struct rpc_task_setup task_setup = {
4970                 .rpc_client = clp->cl_rpcclient,
4971                 .rpc_message = &msg,
4972                 .callback_ops = &nfs4_get_lease_time_ops,
4973                 .callback_data = &data,
4974                 .flags = RPC_TASK_TIMEOUT,
4975         };
4976         int status;
4977
4978         dprintk("--> %s\n", __func__);
4979         task = rpc_run_task(&task_setup);
4980
4981         if (IS_ERR(task))
4982                 status = PTR_ERR(task);
4983         else {
4984                 status = task->tk_status;
4985                 rpc_put_task(task);
4986         }
4987         dprintk("<-- %s return %d\n", __func__, status);
4988
4989         return status;
4990 }
4991
4992 /*
4993  * Reset a slot table
4994  */
4995 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4996                                  int ivalue)
4997 {
4998         struct nfs4_slot *new = NULL;
4999         int i;
5000         int ret = 0;
5001
5002         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5003                 max_reqs, tbl->max_slots);
5004
5005         /* Does the newly negotiated max_reqs match the existing slot table? */
5006         if (max_reqs != tbl->max_slots) {
5007                 ret = -ENOMEM;
5008                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5009                               GFP_NOFS);
5010                 if (!new)
5011                         goto out;
5012                 ret = 0;
5013                 kfree(tbl->slots);
5014         }
5015         spin_lock(&tbl->slot_tbl_lock);
5016         if (new) {
5017                 tbl->slots = new;
5018                 tbl->max_slots = max_reqs;
5019         }
5020         for (i = 0; i < tbl->max_slots; ++i)
5021                 tbl->slots[i].seq_nr = ivalue;
5022         spin_unlock(&tbl->slot_tbl_lock);
5023         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5024                 tbl, tbl->slots, tbl->max_slots);
5025 out:
5026         dprintk("<-- %s: return %d\n", __func__, ret);
5027         return ret;
5028 }
5029
5030 /*
5031  * Reset the forechannel and backchannel slot tables
5032  */
5033 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5034 {
5035         int status;
5036
5037         status = nfs4_reset_slot_table(&session->fc_slot_table,
5038                         session->fc_attrs.max_reqs, 1);
5039         if (status)
5040                 return status;
5041
5042         status = nfs4_reset_slot_table(&session->bc_slot_table,
5043                         session->bc_attrs.max_reqs, 0);
5044         return status;
5045 }
5046
5047 /* Destroy the slot table */
5048 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5049 {
5050         if (session->fc_slot_table.slots != NULL) {
5051                 kfree(session->fc_slot_table.slots);
5052                 session->fc_slot_table.slots = NULL;
5053         }
5054         if (session->bc_slot_table.slots != NULL) {
5055                 kfree(session->bc_slot_table.slots);
5056                 session->bc_slot_table.slots = NULL;
5057         }
5058         return;
5059 }
5060
5061 /*
5062  * Initialize slot table
5063  */
5064 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5065                 int max_slots, int ivalue)
5066 {
5067         struct nfs4_slot *slot;
5068         int ret = -ENOMEM;
5069
5070         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5071
5072         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5073
5074         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5075         if (!slot)
5076                 goto out;
5077         ret = 0;
5078
5079         spin_lock(&tbl->slot_tbl_lock);
5080         tbl->max_slots = max_slots;
5081         tbl->slots = slot;
5082         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5083         spin_unlock(&tbl->slot_tbl_lock);
5084         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5085                 tbl, tbl->slots, tbl->max_slots);
5086 out:
5087         dprintk("<-- %s: return %d\n", __func__, ret);
5088         return ret;
5089 }
5090
5091 /*
5092  * Initialize the forechannel and backchannel tables
5093  */
5094 static int nfs4_init_slot_tables(struct nfs4_session *session)
5095 {
5096         struct nfs4_slot_table *tbl;
5097         int status = 0;
5098
5099         tbl = &session->fc_slot_table;
5100         if (tbl->slots == NULL) {
5101                 status = nfs4_init_slot_table(tbl,
5102                                 session->fc_attrs.max_reqs, 1);
5103                 if (status)
5104                         return status;
5105         }
5106
5107         tbl = &session->bc_slot_table;
5108         if (tbl->slots == NULL) {
5109                 status = nfs4_init_slot_table(tbl,
5110                                 session->bc_attrs.max_reqs, 0);
5111                 if (status)
5112                         nfs4_destroy_slot_tables(session);
5113         }
5114
5115         return status;
5116 }
5117
5118 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5119 {
5120         struct nfs4_session *session;
5121         struct nfs4_slot_table *tbl;
5122
5123         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5124         if (!session)
5125                 return NULL;
5126
5127         tbl = &session->fc_slot_table;
5128         tbl->highest_used_slotid = -1;
5129         spin_lock_init(&tbl->slot_tbl_lock);
5130         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5131         init_completion(&tbl->complete);
5132
5133         tbl = &session->bc_slot_table;
5134         tbl->highest_used_slotid = -1;
5135         spin_lock_init(&tbl->slot_tbl_lock);
5136         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5137         init_completion(&tbl->complete);
5138
5139         session->session_state = 1<<NFS4_SESSION_INITING;
5140
5141         session->clp = clp;
5142         return session;
5143 }
5144
5145 void nfs4_destroy_session(struct nfs4_session *session)
5146 {
5147         nfs4_proc_destroy_session(session);
5148         dprintk("%s Destroy backchannel for xprt %p\n",
5149                 __func__, session->clp->cl_rpcclient->cl_xprt);
5150         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5151                                 NFS41_BC_MIN_CALLBACKS);
5152         nfs4_destroy_slot_tables(session);
5153         kfree(session);
5154 }
5155
5156 /*
5157  * Initialize the values to be used by the client in CREATE_SESSION
5158  * If nfs4_init_session set the fore channel request and response sizes,
5159  * use them.
5160  *
5161  * Set the back channel max_resp_sz_cached to zero to force the client to
5162  * always set csa_cachethis to FALSE because the current implementation
5163  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5164  */
5165 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5166 {
5167         struct nfs4_session *session = args->client->cl_session;
5168         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5169                      mxresp_sz = session->fc_attrs.max_resp_sz;
5170
5171         if (mxrqst_sz == 0)
5172                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5173         if (mxresp_sz == 0)
5174                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5175         /* Fore channel attributes */
5176         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5177         args->fc_attrs.max_resp_sz = mxresp_sz;
5178         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5179         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5180
5181         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5182                 "max_ops=%u max_reqs=%u\n",
5183                 __func__,
5184                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5185                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5186
5187         /* Back channel attributes */
5188         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5189         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5190         args->bc_attrs.max_resp_sz_cached = 0;
5191         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5192         args->bc_attrs.max_reqs = 1;
5193
5194         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5195                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5196                 __func__,
5197                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5198                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5199                 args->bc_attrs.max_reqs);
5200 }
5201
5202 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5203 {
5204         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5205         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5206
5207         if (rcvd->max_resp_sz > sent->max_resp_sz)
5208                 return -EINVAL;
5209         /*
5210          * Our requested max_ops is the minimum we need; we're not
5211          * prepared to break up compounds into smaller pieces than that.
5212          * So, no point even trying to continue if the server won't
5213          * cooperate:
5214          */
5215         if (rcvd->max_ops < sent->max_ops)
5216                 return -EINVAL;
5217         if (rcvd->max_reqs == 0)
5218                 return -EINVAL;
5219         return 0;
5220 }
5221
5222 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5223 {
5224         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5225         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5226
5227         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5228                 return -EINVAL;
5229         if (rcvd->max_resp_sz < sent->max_resp_sz)
5230                 return -EINVAL;
5231         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5232                 return -EINVAL;
5233         /* These would render the backchannel useless: */
5234         if (rcvd->max_ops  == 0)
5235                 return -EINVAL;
5236         if (rcvd->max_reqs == 0)
5237                 return -EINVAL;
5238         return 0;
5239 }
5240
5241 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5242                                      struct nfs4_session *session)
5243 {
5244         int ret;
5245
5246         ret = nfs4_verify_fore_channel_attrs(args, session);
5247         if (ret)
5248                 return ret;
5249         return nfs4_verify_back_channel_attrs(args, session);
5250 }
5251
5252 static int _nfs4_proc_create_session(struct nfs_client *clp)
5253 {
5254         struct nfs4_session *session = clp->cl_session;
5255         struct nfs41_create_session_args args = {
5256                 .client = clp,
5257                 .cb_program = NFS4_CALLBACK,
5258         };
5259         struct nfs41_create_session_res res = {
5260                 .client = clp,
5261         };
5262         struct rpc_message msg = {
5263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5264                 .rpc_argp = &args,
5265                 .rpc_resp = &res,
5266         };
5267         int status;
5268
5269         nfs4_init_channel_attrs(&args);
5270         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5271
5272         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5273
5274         if (!status)
5275                 /* Verify the session's negotiated channel_attrs values */
5276                 status = nfs4_verify_channel_attrs(&args, session);
5277         if (!status) {
5278                 /* Increment the clientid slot sequence id */
5279                 clp->cl_seqid++;
5280         }
5281
5282         return status;
5283 }
5284
5285 /*
5286  * Issues a CREATE_SESSION operation to the server.
5287  * It is the responsibility of the caller to verify the session is
5288  * expired before calling this routine.
5289  */
5290 int nfs4_proc_create_session(struct nfs_client *clp)
5291 {
5292         int status;
5293         unsigned *ptr;
5294         struct nfs4_session *session = clp->cl_session;
5295
5296         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5297
5298         status = _nfs4_proc_create_session(clp);
5299         if (status)
5300                 goto out;
5301
5302         /* Init and reset the fore channel */
5303         status = nfs4_init_slot_tables(session);
5304         dprintk("slot table initialization returned %d\n", status);
5305         if (status)
5306                 goto out;
5307         status = nfs4_reset_slot_tables(session);
5308         dprintk("slot table reset returned %d\n", status);
5309         if (status)
5310                 goto out;
5311
5312         ptr = (unsigned *)&session->sess_id.data[0];
5313         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5314                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5315 out:
5316         dprintk("<-- %s\n", __func__);
5317         return status;
5318 }
5319
5320 /*
5321  * Issue the over-the-wire RPC DESTROY_SESSION.
5322  * The caller must serialize access to this routine.
5323  */
5324 int nfs4_proc_destroy_session(struct nfs4_session *session)
5325 {
5326         int status = 0;
5327         struct rpc_message msg;
5328
5329         dprintk("--> nfs4_proc_destroy_session\n");
5330
5331         /* session is still being setup */
5332         if (session->clp->cl_cons_state != NFS_CS_READY)
5333                 return status;
5334
5335         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5336         msg.rpc_argp = session;
5337         msg.rpc_resp = NULL;
5338         msg.rpc_cred = NULL;
5339         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5340
5341         if (status)
5342                 printk(KERN_WARNING
5343                         "Got error %d from the server on DESTROY_SESSION. "
5344                         "Session has been destroyed regardless...\n", status);
5345
5346         dprintk("<-- nfs4_proc_destroy_session\n");
5347         return status;
5348 }
5349
5350 int nfs4_init_session(struct nfs_server *server)
5351 {
5352         struct nfs_client *clp = server->nfs_client;
5353         struct nfs4_session *session;
5354         unsigned int rsize, wsize;
5355         int ret;
5356
5357         if (!nfs4_has_session(clp))
5358                 return 0;
5359
5360         session = clp->cl_session;
5361         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5362                 return 0;
5363
5364         rsize = server->rsize;
5365         if (rsize == 0)
5366                 rsize = NFS_MAX_FILE_IO_SIZE;
5367         wsize = server->wsize;
5368         if (wsize == 0)
5369                 wsize = NFS_MAX_FILE_IO_SIZE;
5370
5371         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5372         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5373
5374         ret = nfs4_recover_expired_lease(server);
5375         if (!ret)
5376                 ret = nfs4_check_client_ready(clp);
5377         return ret;
5378 }
5379
5380 int nfs4_init_ds_session(struct nfs_client *clp)
5381 {
5382         struct nfs4_session *session = clp->cl_session;
5383         int ret;
5384
5385         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5386                 return 0;
5387
5388         ret = nfs4_client_recover_expired_lease(clp);
5389         if (!ret)
5390                 /* Test for the DS role */
5391                 if (!is_ds_client(clp))
5392                         ret = -ENODEV;
5393         if (!ret)
5394                 ret = nfs4_check_client_ready(clp);
5395         return ret;
5396
5397 }
5398 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5399
5400
5401 /*
5402  * Renew the cl_session lease.
5403  */
5404 struct nfs4_sequence_data {
5405         struct nfs_client *clp;
5406         struct nfs4_sequence_args args;
5407         struct nfs4_sequence_res res;
5408 };
5409
5410 static void nfs41_sequence_release(void *data)
5411 {
5412         struct nfs4_sequence_data *calldata = data;
5413         struct nfs_client *clp = calldata->clp;
5414
5415         if (atomic_read(&clp->cl_count) > 1)
5416                 nfs4_schedule_state_renewal(clp);
5417         nfs_put_client(clp);
5418         kfree(calldata);
5419 }
5420
5421 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5422 {
5423         switch(task->tk_status) {
5424         case -NFS4ERR_DELAY:
5425                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5426                 return -EAGAIN;
5427         default:
5428                 nfs4_schedule_lease_recovery(clp);
5429         }
5430         return 0;
5431 }
5432
5433 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5434 {
5435         struct nfs4_sequence_data *calldata = data;
5436         struct nfs_client *clp = calldata->clp;
5437
5438         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5439                 return;
5440
5441         if (task->tk_status < 0) {
5442                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5443                 if (atomic_read(&clp->cl_count) == 1)
5444                         goto out;
5445
5446                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5447                         rpc_restart_call_prepare(task);
5448                         return;
5449                 }
5450         }
5451         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5452 out:
5453         dprintk("<-- %s\n", __func__);
5454 }
5455
5456 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5457 {
5458         struct nfs4_sequence_data *calldata = data;
5459         struct nfs_client *clp = calldata->clp;
5460         struct nfs4_sequence_args *args;
5461         struct nfs4_sequence_res *res;
5462
5463         args = task->tk_msg.rpc_argp;
5464         res = task->tk_msg.rpc_resp;
5465
5466         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5467                 return;
5468         rpc_call_start(task);
5469 }
5470
5471 static const struct rpc_call_ops nfs41_sequence_ops = {
5472         .rpc_call_done = nfs41_sequence_call_done,
5473         .rpc_call_prepare = nfs41_sequence_prepare,
5474         .rpc_release = nfs41_sequence_release,
5475 };
5476
5477 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5478 {
5479         struct nfs4_sequence_data *calldata;
5480         struct rpc_message msg = {
5481                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5482                 .rpc_cred = cred,
5483         };
5484         struct rpc_task_setup task_setup_data = {
5485                 .rpc_client = clp->cl_rpcclient,
5486                 .rpc_message = &msg,
5487                 .callback_ops = &nfs41_sequence_ops,
5488                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5489         };
5490
5491         if (!atomic_inc_not_zero(&clp->cl_count))
5492                 return ERR_PTR(-EIO);
5493         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5494         if (calldata == NULL) {
5495                 nfs_put_client(clp);
5496                 return ERR_PTR(-ENOMEM);
5497         }
5498         msg.rpc_argp = &calldata->args;
5499         msg.rpc_resp = &calldata->res;
5500         calldata->clp = clp;
5501         task_setup_data.callback_data = calldata;
5502
5503         return rpc_run_task(&task_setup_data);
5504 }
5505
5506 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5507 {
5508         struct rpc_task *task;
5509         int ret = 0;
5510
5511         task = _nfs41_proc_sequence(clp, cred);
5512         if (IS_ERR(task))
5513                 ret = PTR_ERR(task);
5514         else
5515                 rpc_put_task_async(task);
5516         dprintk("<-- %s status=%d\n", __func__, ret);
5517         return ret;
5518 }
5519
5520 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5521 {
5522         struct rpc_task *task;
5523         int ret;
5524
5525         task = _nfs41_proc_sequence(clp, cred);
5526         if (IS_ERR(task)) {
5527                 ret = PTR_ERR(task);
5528                 goto out;
5529         }
5530         ret = rpc_wait_for_completion_task(task);
5531         if (!ret) {
5532                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5533
5534                 if (task->tk_status == 0)
5535                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5536                 ret = task->tk_status;
5537         }
5538         rpc_put_task(task);
5539 out:
5540         dprintk("<-- %s status=%d\n", __func__, ret);
5541         return ret;
5542 }
5543
5544 struct nfs4_reclaim_complete_data {
5545         struct nfs_client *clp;
5546         struct nfs41_reclaim_complete_args arg;
5547         struct nfs41_reclaim_complete_res res;
5548 };
5549
5550 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5551 {
5552         struct nfs4_reclaim_complete_data *calldata = data;
5553
5554         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5555         if (nfs41_setup_sequence(calldata->clp->cl_session,
5556                                 &calldata->arg.seq_args,
5557                                 &calldata->res.seq_res, 0, task))
5558                 return;
5559
5560         rpc_call_start(task);
5561 }
5562
5563 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5564 {
5565         switch(task->tk_status) {
5566         case 0:
5567         case -NFS4ERR_COMPLETE_ALREADY:
5568         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5569                 break;
5570         case -NFS4ERR_DELAY:
5571                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5572                 /* fall through */
5573         case -NFS4ERR_RETRY_UNCACHED_REP:
5574                 return -EAGAIN;
5575         default:
5576                 nfs4_schedule_lease_recovery(clp);
5577         }
5578         return 0;
5579 }
5580
5581 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5582 {
5583         struct nfs4_reclaim_complete_data *calldata = data;
5584         struct nfs_client *clp = calldata->clp;
5585         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5586
5587         dprintk("--> %s\n", __func__);
5588         if (!nfs41_sequence_done(task, res))
5589                 return;
5590
5591         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5592                 rpc_restart_call_prepare(task);
5593                 return;
5594         }
5595         dprintk("<-- %s\n", __func__);
5596 }
5597
5598 static void nfs4_free_reclaim_complete_data(void *data)
5599 {
5600         struct nfs4_reclaim_complete_data *calldata = data;
5601
5602         kfree(calldata);
5603 }
5604
5605 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5606         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5607         .rpc_call_done = nfs4_reclaim_complete_done,
5608         .rpc_release = nfs4_free_reclaim_complete_data,
5609 };
5610
5611 /*
5612  * Issue a global reclaim complete.
5613  */
5614 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5615 {
5616         struct nfs4_reclaim_complete_data *calldata;
5617         struct rpc_task *task;
5618         struct rpc_message msg = {
5619                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5620         };
5621         struct rpc_task_setup task_setup_data = {
5622                 .rpc_client = clp->cl_rpcclient,
5623                 .rpc_message = &msg,
5624                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5625                 .flags = RPC_TASK_ASYNC,
5626         };
5627         int status = -ENOMEM;
5628
5629         dprintk("--> %s\n", __func__);
5630         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5631         if (calldata == NULL)
5632                 goto out;
5633         calldata->clp = clp;
5634         calldata->arg.one_fs = 0;
5635
5636         msg.rpc_argp = &calldata->arg;
5637         msg.rpc_resp = &calldata->res;
5638         task_setup_data.callback_data = calldata;
5639         task = rpc_run_task(&task_setup_data);
5640         if (IS_ERR(task)) {
5641                 status = PTR_ERR(task);
5642                 goto out;
5643         }
5644         status = nfs4_wait_for_completion_rpc_task(task);
5645         if (status == 0)
5646                 status = task->tk_status;
5647         rpc_put_task(task);
5648         return 0;
5649 out:
5650         dprintk("<-- %s status=%d\n", __func__, status);
5651         return status;
5652 }
5653
5654 static void
5655 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5656 {
5657         struct nfs4_layoutget *lgp = calldata;
5658         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5659
5660         dprintk("--> %s\n", __func__);
5661         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5662          * right now covering the LAYOUTGET we are about to send.
5663          * However, that is not so catastrophic, and there seems
5664          * to be no way to prevent it completely.
5665          */
5666         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5667                                 &lgp->res.seq_res, 0, task))
5668                 return;
5669         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5670                                           NFS_I(lgp->args.inode)->layout,
5671                                           lgp->args.ctx->state)) {
5672                 rpc_exit(task, NFS4_OK);
5673                 return;
5674         }
5675         rpc_call_start(task);
5676 }
5677
5678 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5679 {
5680         struct nfs4_layoutget *lgp = calldata;
5681         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5682
5683         dprintk("--> %s\n", __func__);
5684
5685         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5686                 return;
5687
5688         switch (task->tk_status) {
5689         case 0:
5690                 break;
5691         case -NFS4ERR_LAYOUTTRYLATER:
5692         case -NFS4ERR_RECALLCONFLICT:
5693                 task->tk_status = -NFS4ERR_DELAY;
5694                 /* Fall through */
5695         default:
5696                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5697                         rpc_restart_call_prepare(task);
5698                         return;
5699                 }
5700         }
5701         dprintk("<-- %s\n", __func__);
5702 }
5703
5704 static void nfs4_layoutget_release(void *calldata)
5705 {
5706         struct nfs4_layoutget *lgp = calldata;
5707
5708         dprintk("--> %s\n", __func__);
5709         put_nfs_open_context(lgp->args.ctx);
5710         kfree(calldata);
5711         dprintk("<-- %s\n", __func__);
5712 }
5713
5714 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5715         .rpc_call_prepare = nfs4_layoutget_prepare,
5716         .rpc_call_done = nfs4_layoutget_done,
5717         .rpc_release = nfs4_layoutget_release,
5718 };
5719
5720 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5721 {
5722         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5723         struct rpc_task *task;
5724         struct rpc_message msg = {
5725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5726                 .rpc_argp = &lgp->args,
5727                 .rpc_resp = &lgp->res,
5728         };
5729         struct rpc_task_setup task_setup_data = {
5730                 .rpc_client = server->client,
5731                 .rpc_message = &msg,
5732                 .callback_ops = &nfs4_layoutget_call_ops,
5733                 .callback_data = lgp,
5734                 .flags = RPC_TASK_ASYNC,
5735         };
5736         int status = 0;
5737
5738         dprintk("--> %s\n", __func__);
5739
5740         lgp->res.layoutp = &lgp->args.layout;
5741         lgp->res.seq_res.sr_slot = NULL;
5742         task = rpc_run_task(&task_setup_data);
5743         if (IS_ERR(task))
5744                 return PTR_ERR(task);
5745         status = nfs4_wait_for_completion_rpc_task(task);
5746         if (status == 0)
5747                 status = task->tk_status;
5748         if (status == 0)
5749                 status = pnfs_layout_process(lgp);
5750         rpc_put_task(task);
5751         dprintk("<-- %s status=%d\n", __func__, status);
5752         return status;
5753 }
5754
5755 static void
5756 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5757 {
5758         struct nfs4_layoutreturn *lrp = calldata;
5759
5760         dprintk("--> %s\n", __func__);
5761         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5762                                 &lrp->res.seq_res, 0, task))
5763                 return;
5764         rpc_call_start(task);
5765 }
5766
5767 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5768 {
5769         struct nfs4_layoutreturn *lrp = calldata;
5770         struct nfs_server *server;
5771         struct pnfs_layout_hdr *lo = lrp->args.layout;
5772
5773         dprintk("--> %s\n", __func__);
5774
5775         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5776                 return;
5777
5778         server = NFS_SERVER(lrp->args.inode);
5779         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5780                 nfs_restart_rpc(task, lrp->clp);
5781                 return;
5782         }
5783         spin_lock(&lo->plh_inode->i_lock);
5784         if (task->tk_status == 0) {
5785                 if (lrp->res.lrs_present) {
5786                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5787                 } else
5788                         BUG_ON(!list_empty(&lo->plh_segs));
5789         }
5790         lo->plh_block_lgets--;
5791         spin_unlock(&lo->plh_inode->i_lock);
5792         dprintk("<-- %s\n", __func__);
5793 }
5794
5795 static void nfs4_layoutreturn_release(void *calldata)
5796 {
5797         struct nfs4_layoutreturn *lrp = calldata;
5798
5799         dprintk("--> %s\n", __func__);
5800         put_layout_hdr(lrp->args.layout);
5801         kfree(calldata);
5802         dprintk("<-- %s\n", __func__);
5803 }
5804
5805 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5806         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5807         .rpc_call_done = nfs4_layoutreturn_done,
5808         .rpc_release = nfs4_layoutreturn_release,
5809 };
5810
5811 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5812 {
5813         struct rpc_task *task;
5814         struct rpc_message msg = {
5815                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5816                 .rpc_argp = &lrp->args,
5817                 .rpc_resp = &lrp->res,
5818         };
5819         struct rpc_task_setup task_setup_data = {
5820                 .rpc_client = lrp->clp->cl_rpcclient,
5821                 .rpc_message = &msg,
5822                 .callback_ops = &nfs4_layoutreturn_call_ops,
5823                 .callback_data = lrp,
5824         };
5825         int status;
5826
5827         dprintk("--> %s\n", __func__);
5828         task = rpc_run_task(&task_setup_data);
5829         if (IS_ERR(task))
5830                 return PTR_ERR(task);
5831         status = task->tk_status;
5832         dprintk("<-- %s status=%d\n", __func__, status);
5833         rpc_put_task(task);
5834         return status;
5835 }
5836
5837 static int
5838 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5839 {
5840         struct nfs4_getdeviceinfo_args args = {
5841                 .pdev = pdev,
5842         };
5843         struct nfs4_getdeviceinfo_res res = {
5844                 .pdev = pdev,
5845         };
5846         struct rpc_message msg = {
5847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5848                 .rpc_argp = &args,
5849                 .rpc_resp = &res,
5850         };
5851         int status;
5852
5853         dprintk("--> %s\n", __func__);
5854         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5855         dprintk("<-- %s status=%d\n", __func__, status);
5856
5857         return status;
5858 }
5859
5860 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5861 {
5862         struct nfs4_exception exception = { };
5863         int err;
5864
5865         do {
5866                 err = nfs4_handle_exception(server,
5867                                         _nfs4_proc_getdeviceinfo(server, pdev),
5868                                         &exception);
5869         } while (exception.retry);
5870         return err;
5871 }
5872 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5873
5874 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5875 {
5876         struct nfs4_layoutcommit_data *data = calldata;
5877         struct nfs_server *server = NFS_SERVER(data->args.inode);
5878
5879         if (nfs4_setup_sequence(server, &data->args.seq_args,
5880                                 &data->res.seq_res, 1, task))
5881                 return;
5882         rpc_call_start(task);
5883 }
5884
5885 static void
5886 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5887 {
5888         struct nfs4_layoutcommit_data *data = calldata;
5889         struct nfs_server *server = NFS_SERVER(data->args.inode);
5890
5891         if (!nfs4_sequence_done(task, &data->res.seq_res))
5892                 return;
5893
5894         switch (task->tk_status) { /* Just ignore these failures */
5895         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5896         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5897         case NFS4ERR_BADLAYOUT:     /* no layout */
5898         case NFS4ERR_GRACE:         /* loca_recalim always false */
5899                 task->tk_status = 0;
5900         }
5901
5902         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5903                 nfs_restart_rpc(task, server->nfs_client);
5904                 return;
5905         }
5906
5907         if (task->tk_status == 0)
5908                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5909                                                    data->res.fattr);
5910 }
5911
5912 static void nfs4_layoutcommit_release(void *calldata)
5913 {
5914         struct nfs4_layoutcommit_data *data = calldata;
5915
5916         /* Matched by references in pnfs_set_layoutcommit */
5917         put_lseg(data->lseg);
5918         put_rpccred(data->cred);
5919         kfree(data);
5920 }
5921
5922 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5923         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5924         .rpc_call_done = nfs4_layoutcommit_done,
5925         .rpc_release = nfs4_layoutcommit_release,
5926 };
5927
5928 int
5929 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5930 {
5931         struct rpc_message msg = {
5932                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5933                 .rpc_argp = &data->args,
5934                 .rpc_resp = &data->res,
5935                 .rpc_cred = data->cred,
5936         };
5937         struct rpc_task_setup task_setup_data = {
5938                 .task = &data->task,
5939                 .rpc_client = NFS_CLIENT(data->args.inode),
5940                 .rpc_message = &msg,
5941                 .callback_ops = &nfs4_layoutcommit_ops,
5942                 .callback_data = data,
5943                 .flags = RPC_TASK_ASYNC,
5944         };
5945         struct rpc_task *task;
5946         int status = 0;
5947
5948         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5949                 "lbw: %llu inode %lu\n",
5950                 data->task.tk_pid, sync,
5951                 data->args.lastbytewritten,
5952                 data->args.inode->i_ino);
5953
5954         task = rpc_run_task(&task_setup_data);
5955         if (IS_ERR(task))
5956                 return PTR_ERR(task);
5957         if (sync == false)
5958                 goto out;
5959         status = nfs4_wait_for_completion_rpc_task(task);
5960         if (status != 0)
5961                 goto out;
5962         status = task->tk_status;
5963 out:
5964         dprintk("%s: status %d\n", __func__, status);
5965         rpc_put_task(task);
5966         return status;
5967 }
5968
5969 static int
5970 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
5971                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
5972 {
5973         struct nfs41_secinfo_no_name_args args = {
5974                 .style = SECINFO_STYLE_CURRENT_FH,
5975         };
5976         struct nfs4_secinfo_res res = {
5977                 .flavors = flavors,
5978         };
5979         struct rpc_message msg = {
5980                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
5981                 .rpc_argp = &args,
5982                 .rpc_resp = &res,
5983         };
5984         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5985 }
5986
5987 static int
5988 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
5989                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
5990 {
5991         struct nfs4_exception exception = { };
5992         int err;
5993         do {
5994                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
5995                 switch (err) {
5996                 case 0:
5997                 case -NFS4ERR_WRONGSEC:
5998                 case -NFS4ERR_NOTSUPP:
5999                         break;
6000                 default:
6001                         err = nfs4_handle_exception(server, err, &exception);
6002                 }
6003         } while (exception.retry);
6004         return err;
6005 }
6006
6007 static int
6008 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6009                     struct nfs_fsinfo *info)
6010 {
6011         int err;
6012         struct page *page;
6013         rpc_authflavor_t flavor;
6014         struct nfs4_secinfo_flavors *flavors;
6015
6016         page = alloc_page(GFP_KERNEL);
6017         if (!page) {
6018                 err = -ENOMEM;
6019                 goto out;
6020         }
6021
6022         flavors = page_address(page);
6023         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6024
6025         /*
6026          * Fall back on "guess and check" method if
6027          * the server doesn't support SECINFO_NO_NAME
6028          */
6029         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6030                 err = nfs4_find_root_sec(server, fhandle, info);
6031                 goto out_freepage;
6032         }
6033         if (err)
6034                 goto out_freepage;
6035
6036         flavor = nfs_find_best_sec(flavors);
6037         if (err == 0)
6038                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6039
6040 out_freepage:
6041         put_page(page);
6042         if (err == -EACCES)
6043                 return -EPERM;
6044 out:
6045         return err;
6046 }
6047 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6048 {
6049         int status;
6050         struct nfs41_test_stateid_args args = {
6051                 .stateid = &state->stateid,
6052         };
6053         struct nfs41_test_stateid_res res;
6054         struct rpc_message msg = {
6055                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6056                 .rpc_argp = &args,
6057                 .rpc_resp = &res,
6058         };
6059         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6060         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6061         return status;
6062 }
6063
6064 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6065 {
6066         struct nfs4_exception exception = { };
6067         int err;
6068         do {
6069                 err = nfs4_handle_exception(server,
6070                                 _nfs41_test_stateid(server, state),
6071                                 &exception);
6072         } while (exception.retry);
6073         return err;
6074 }
6075
6076 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6077 {
6078         int status;
6079         struct nfs41_free_stateid_args args = {
6080                 .stateid = &state->stateid,
6081         };
6082         struct nfs41_free_stateid_res res;
6083         struct rpc_message msg = {
6084                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6085                 .rpc_argp = &args,
6086                 .rpc_resp = &res,
6087         };
6088
6089         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6090         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6091         return status;
6092 }
6093
6094 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6095 {
6096         struct nfs4_exception exception = { };
6097         int err;
6098         do {
6099                 err = nfs4_handle_exception(server,
6100                                 _nfs4_free_stateid(server, state),
6101                                 &exception);
6102         } while (exception.retry);
6103         return err;
6104 }
6105 #endif /* CONFIG_NFS_V4_1 */
6106
6107 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6108         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6109         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6110         .recover_open   = nfs4_open_reclaim,
6111         .recover_lock   = nfs4_lock_reclaim,
6112         .establish_clid = nfs4_init_clientid,
6113         .get_clid_cred  = nfs4_get_setclientid_cred,
6114 };
6115
6116 #if defined(CONFIG_NFS_V4_1)
6117 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6118         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6119         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6120         .recover_open   = nfs4_open_reclaim,
6121         .recover_lock   = nfs4_lock_reclaim,
6122         .establish_clid = nfs41_init_clientid,
6123         .get_clid_cred  = nfs4_get_exchange_id_cred,
6124         .reclaim_complete = nfs41_proc_reclaim_complete,
6125 };
6126 #endif /* CONFIG_NFS_V4_1 */
6127
6128 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6129         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6130         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6131         .recover_open   = nfs4_open_expired,
6132         .recover_lock   = nfs4_lock_expired,
6133         .establish_clid = nfs4_init_clientid,
6134         .get_clid_cred  = nfs4_get_setclientid_cred,
6135 };
6136
6137 #if defined(CONFIG_NFS_V4_1)
6138 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6139         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6140         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6141         .recover_open   = nfs41_open_expired,
6142         .recover_lock   = nfs41_lock_expired,
6143         .establish_clid = nfs41_init_clientid,
6144         .get_clid_cred  = nfs4_get_exchange_id_cred,
6145 };
6146 #endif /* CONFIG_NFS_V4_1 */
6147
6148 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6149         .sched_state_renewal = nfs4_proc_async_renew,
6150         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6151         .renew_lease = nfs4_proc_renew,
6152 };
6153
6154 #if defined(CONFIG_NFS_V4_1)
6155 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6156         .sched_state_renewal = nfs41_proc_async_sequence,
6157         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6158         .renew_lease = nfs4_proc_sequence,
6159 };
6160 #endif
6161
6162 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6163         .minor_version = 0,
6164         .call_sync = _nfs4_call_sync,
6165         .validate_stateid = nfs4_validate_delegation_stateid,
6166         .find_root_sec = nfs4_find_root_sec,
6167         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6168         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6169         .state_renewal_ops = &nfs40_state_renewal_ops,
6170 };
6171
6172 #if defined(CONFIG_NFS_V4_1)
6173 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6174         .minor_version = 1,
6175         .call_sync = _nfs4_call_sync_session,
6176         .validate_stateid = nfs41_validate_delegation_stateid,
6177         .find_root_sec = nfs41_find_root_sec,
6178         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6179         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6180         .state_renewal_ops = &nfs41_state_renewal_ops,
6181 };
6182 #endif
6183
6184 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6185         [0] = &nfs_v4_0_minor_ops,
6186 #if defined(CONFIG_NFS_V4_1)
6187         [1] = &nfs_v4_1_minor_ops,
6188 #endif
6189 };
6190
6191 static const struct inode_operations nfs4_file_inode_operations = {
6192         .permission     = nfs_permission,
6193         .getattr        = nfs_getattr,
6194         .setattr        = nfs_setattr,
6195         .getxattr       = generic_getxattr,
6196         .setxattr       = generic_setxattr,
6197         .listxattr      = generic_listxattr,
6198         .removexattr    = generic_removexattr,
6199 };
6200
6201 const struct nfs_rpc_ops nfs_v4_clientops = {
6202         .version        = 4,                    /* protocol version */
6203         .dentry_ops     = &nfs4_dentry_operations,
6204         .dir_inode_ops  = &nfs4_dir_inode_operations,
6205         .file_inode_ops = &nfs4_file_inode_operations,
6206         .getroot        = nfs4_proc_get_root,
6207         .getattr        = nfs4_proc_getattr,
6208         .setattr        = nfs4_proc_setattr,
6209         .lookupfh       = nfs4_proc_lookupfh,
6210         .lookup         = nfs4_proc_lookup,
6211         .access         = nfs4_proc_access,
6212         .readlink       = nfs4_proc_readlink,
6213         .create         = nfs4_proc_create,
6214         .remove         = nfs4_proc_remove,
6215         .unlink_setup   = nfs4_proc_unlink_setup,
6216         .unlink_done    = nfs4_proc_unlink_done,
6217         .rename         = nfs4_proc_rename,
6218         .rename_setup   = nfs4_proc_rename_setup,
6219         .rename_done    = nfs4_proc_rename_done,
6220         .link           = nfs4_proc_link,
6221         .symlink        = nfs4_proc_symlink,
6222         .mkdir          = nfs4_proc_mkdir,
6223         .rmdir          = nfs4_proc_remove,
6224         .readdir        = nfs4_proc_readdir,
6225         .mknod          = nfs4_proc_mknod,
6226         .statfs         = nfs4_proc_statfs,
6227         .fsinfo         = nfs4_proc_fsinfo,
6228         .pathconf       = nfs4_proc_pathconf,
6229         .set_capabilities = nfs4_server_capabilities,
6230         .decode_dirent  = nfs4_decode_dirent,
6231         .read_setup     = nfs4_proc_read_setup,
6232         .read_done      = nfs4_read_done,
6233         .write_setup    = nfs4_proc_write_setup,
6234         .write_done     = nfs4_write_done,
6235         .commit_setup   = nfs4_proc_commit_setup,
6236         .commit_done    = nfs4_commit_done,
6237         .lock           = nfs4_proc_lock,
6238         .clear_acl_cache = nfs4_zap_acl_attr,
6239         .close_context  = nfs4_close_context,
6240         .open_context   = nfs4_atomic_open,
6241         .init_client    = nfs4_init_client,
6242         .secinfo        = nfs4_proc_secinfo,
6243 };
6244
6245 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6246         .prefix = XATTR_NAME_NFSV4_ACL,
6247         .list   = nfs4_xattr_list_nfs4_acl,
6248         .get    = nfs4_xattr_get_nfs4_acl,
6249         .set    = nfs4_xattr_set_nfs4_acl,
6250 };
6251
6252 const struct xattr_handler *nfs4_xattr_handlers[] = {
6253         &nfs4_xattr_nfs4_acl_handler,
6254         NULL
6255 };
6256
6257 /*
6258  * Local variables:
6259  *  c-basic-offset: 8
6260  * End:
6261  */