fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/sunrpc/bc_xprt.h>
  56 #include <linux/xattr.h>
  57 #include <linux/utsname.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65
  66 #define NFSDBG_FACILITY         NFSDBG_PROC
  67
  68 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  69 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  70
  71 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  72
  73 struct nfs4_opendata;
  74 static int _nfs4_proc_open(struct nfs4_opendata *data);
  75 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  76 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  77 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  78 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  79 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  80                             struct nfs_fattr *fattr, struct iattr *sattr,
  81                             struct nfs4_state *state);
  82 #ifdef CONFIG_NFS_V4_1
  83 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  84 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  85 #endif
  86 /* Prevent leaks of NFSv4 errors into userland */
  87 static int nfs4_map_errors(int err)
  88 {
  89         if (err >= -1000)
  90                 return err;
  91         switch (err) {
  92         case -NFS4ERR_RESOURCE:
  93                 return -EREMOTEIO;
  94         case -NFS4ERR_WRONGSEC:
  95                 return -EPERM;
  96         case -NFS4ERR_BADOWNER:
  97         case -NFS4ERR_BADNAME:
  98                 return -EINVAL;
  99         default:
 100                 dprintk("%s could not handle NFSv4 error %d\n",
 101                                 __func__, -err);
 102                 break;
 103         }
 104         return -EIO;
 105 }
 106
 107 /*
 108  * This is our standard bitmap for GETATTR requests.
 109  */
 110 const u32 nfs4_fattr_bitmap[2] = {
 111         FATTR4_WORD0_TYPE
 112         | FATTR4_WORD0_CHANGE
 113         | FATTR4_WORD0_SIZE
 114         | FATTR4_WORD0_FSID
 115         | FATTR4_WORD0_FILEID,
 116         FATTR4_WORD1_MODE
 117         | FATTR4_WORD1_NUMLINKS
 118         | FATTR4_WORD1_OWNER
 119         | FATTR4_WORD1_OWNER_GROUP
 120         | FATTR4_WORD1_RAWDEV
 121         | FATTR4_WORD1_SPACE_USED
 122         | FATTR4_WORD1_TIME_ACCESS
 123         | FATTR4_WORD1_TIME_METADATA
 124         | FATTR4_WORD1_TIME_MODIFY
 125 };
 126
 127 const u32 nfs4_statfs_bitmap[2] = {
 128         FATTR4_WORD0_FILES_AVAIL
 129         | FATTR4_WORD0_FILES_FREE
 130         | FATTR4_WORD0_FILES_TOTAL,
 131         FATTR4_WORD1_SPACE_AVAIL
 132         | FATTR4_WORD1_SPACE_FREE
 133         | FATTR4_WORD1_SPACE_TOTAL
 134 };
 135
 136 const u32 nfs4_pathconf_bitmap[2] = {
 137         FATTR4_WORD0_MAXLINK
 138         | FATTR4_WORD0_MAXNAME,
 139         0
 140 };
 141
 142 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 143                         | FATTR4_WORD0_MAXREAD
 144                         | FATTR4_WORD0_MAXWRITE
 145                         | FATTR4_WORD0_LEASE_TIME,
 146                         FATTR4_WORD1_TIME_DELTA
 147                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 148                         FATTR4_WORD2_LAYOUT_BLKSIZE
 149 };
 150
 151 const u32 nfs4_fs_locations_bitmap[2] = {
 152         FATTR4_WORD0_TYPE
 153         | FATTR4_WORD0_CHANGE
 154         | FATTR4_WORD0_SIZE
 155         | FATTR4_WORD0_FSID
 156         | FATTR4_WORD0_FILEID
 157         | FATTR4_WORD0_FS_LOCATIONS,
 158         FATTR4_WORD1_MODE
 159         | FATTR4_WORD1_NUMLINKS
 160         | FATTR4_WORD1_OWNER
 161         | FATTR4_WORD1_OWNER_GROUP
 162         | FATTR4_WORD1_RAWDEV
 163         | FATTR4_WORD1_SPACE_USED
 164         | FATTR4_WORD1_TIME_ACCESS
 165         | FATTR4_WORD1_TIME_METADATA
 166         | FATTR4_WORD1_TIME_MODIFY
 167         | FATTR4_WORD1_MOUNTED_ON_FILEID
 168 };
 169
 170 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 171                 struct nfs4_readdir_arg *readdir)
 172 {
 173         __be32 *start, *p;
 174
 175         BUG_ON(readdir->count < 80);
 176         if (cookie > 2) {
 177                 readdir->cookie = cookie;
 178                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 179                 return;
 180         }
 181
 182         readdir->cookie = 0;
 183         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 184         if (cookie == 2)
 185                 return;
 186
 187         /*
 188          * NFSv4 servers do not return entries for '.' and '..'
 189          * Therefore, we fake these entries here.  We let '.'
 190          * have cookie 0 and '..' have cookie 1.  Note that
 191          * when talking to the server, we always send cookie 0
 192          * instead of 1 or 2.
 193          */
 194         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 195
 196         if (cookie == 0) {
 197                 *p++ = xdr_one;                                  /* next */
 198                 *p++ = xdr_zero;                   /* cookie, first word */
 199                 *p++ = xdr_one;                   /* cookie, second word */
 200                 *p++ = xdr_one;                             /* entry len */
 201                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 202                 p++;
 203                 *p++ = xdr_one;                         /* bitmap length */
 204                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 205                 *p++ = htonl(8);              /* attribute buffer length */
 206                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 207         }
 208
 209         *p++ = xdr_one;                                  /* next */
 210         *p++ = xdr_zero;                   /* cookie, first word */
 211         *p++ = xdr_two;                   /* cookie, second word */
 212         *p++ = xdr_two;                             /* entry len */
 213         memcpy(p, "..\0\0", 4);                         /* entry */
 214         p++;
 215         *p++ = xdr_one;                         /* bitmap length */
 216         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 217         *p++ = htonl(8);              /* attribute buffer length */
 218         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 219
 220         readdir->pgbase = (char *)p - (char *)start;
 221         readdir->count -= readdir->pgbase;
 222         kunmap_atomic(start, KM_USER0);
 223 }
 224
 225 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 226 {
 227         int res;
 228
 229         might_sleep();
 230
 231         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 232                         nfs_wait_bit_killable, TASK_KILLABLE);
 233         return res;
 234 }
 235
 236 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 237 {
 238         int res = 0;
 239
 240         might_sleep();
 241
 242         if (*timeout <= 0)
 243                 *timeout = NFS4_POLL_RETRY_MIN;
 244         if (*timeout > NFS4_POLL_RETRY_MAX)
 245                 *timeout = NFS4_POLL_RETRY_MAX;
 246         schedule_timeout_killable(*timeout);
 247         if (fatal_signal_pending(current))
 248                 res = -ERESTARTSYS;
 249         *timeout <<= 1;
 250         return res;
 251 }
 252
 253 /* This is the error handling routine for processes that are allowed
 254  * to sleep.
 255  */
 256 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 257 {
 258         struct nfs_client *clp = server->nfs_client;
 259         struct nfs4_state *state = exception->state;
 260         int ret = errorcode;
 261
 262         exception->retry = 0;
 263         switch(errorcode) {
 264                 case 0:
 265                         return 0;
 266                 case -NFS4ERR_DELEG_REVOKED:
 267                 case -NFS4ERR_ADMIN_REVOKED:
 268                 case -NFS4ERR_BAD_STATEID:
 269                         if (state != NULL)
 270                                 nfs_remove_bad_delegation(state->inode);
 271                 case -NFS4ERR_OPENMODE:
 272                         if (state == NULL)
 273                                 break;
 274                         nfs4_schedule_stateid_recovery(server, state);
 275                         goto wait_on_recovery;
 276                 case -NFS4ERR_EXPIRED:
 277                         if (state != NULL)
 278                                 nfs4_schedule_stateid_recovery(server, state);
 279                 case -NFS4ERR_STALE_STATEID:
 280                 case -NFS4ERR_STALE_CLIENTID:
 281                         nfs4_schedule_lease_recovery(clp);
 282                         goto wait_on_recovery;
 283 #if defined(CONFIG_NFS_V4_1)
 284                 case -NFS4ERR_BADSESSION:
 285                 case -NFS4ERR_BADSLOT:
 286                 case -NFS4ERR_BAD_HIGH_SLOT:
 287                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 288                 case -NFS4ERR_DEADSESSION:
 289                 case -NFS4ERR_SEQ_FALSE_RETRY:
 290                 case -NFS4ERR_SEQ_MISORDERED:
 291                         dprintk("%s ERROR: %d Reset session\n", __func__,
 292                                 errorcode);
 293                         nfs4_schedule_session_recovery(clp->cl_session);
 294                         exception->retry = 1;
 295                         break;
 296 #endif /* defined(CONFIG_NFS_V4_1) */
 297                 case -NFS4ERR_FILE_OPEN:
 298                         if (exception->timeout > HZ) {
 299                                 /* We have retried a decent amount, time to
 300                                  * fail
 301                                  */
 302                                 ret = -EBUSY;
 303                                 break;
 304                         }
 305                 case -NFS4ERR_GRACE:
 306                 case -NFS4ERR_DELAY:
 307                 case -EKEYEXPIRED:
 308                         ret = nfs4_delay(server->client, &exception->timeout);
 309                         if (ret != 0)
 310                                 break;
 311                 case -NFS4ERR_RETRY_UNCACHED_REP:
 312                 case -NFS4ERR_OLD_STATEID:
 313                         exception->retry = 1;
 314                         break;
 315                 case -NFS4ERR_BADOWNER:
 316                         /* The following works around a Linux server bug! */
 317                 case -NFS4ERR_BADNAME:
 318                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 319                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 320                                 exception->retry = 1;
 321                                 printk(KERN_WARNING "NFS: v4 server %s "
 322                                                 "does not accept raw "
 323                                                 "uid/gids. "
 324                                                 "Reenabling the idmapper.\n",
 325                                                 server->nfs_client->cl_hostname);
 326                         }
 327         }
 328         /* We failed to handle the error */
 329         return nfs4_map_errors(ret);
 330 wait_on_recovery:
 331         ret = nfs4_wait_clnt_recover(clp);
 332         if (ret == 0)
 333                 exception->retry = 1;
 334         return ret;
 335 }
 336
 337
 338 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 339 {
 340         spin_lock(&clp->cl_lock);
 341         if (time_before(clp->cl_last_renewal,timestamp))
 342                 clp->cl_last_renewal = timestamp;
 343         spin_unlock(&clp->cl_lock);
 344 }
 345
 346 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 347 {
 348         do_renew_lease(server->nfs_client, timestamp);
 349 }
 350
 351 #if defined(CONFIG_NFS_V4_1)
 352
 353 /*
 354  * nfs4_free_slot - free a slot and efficiently update slot table.
 355  *
 356  * freeing a slot is trivially done by clearing its respective bit
 357  * in the bitmap.
 358  * If the freed slotid equals highest_used_slotid we want to update it
 359  * so that the server would be able to size down the slot table if needed,
 360  * otherwise we know that the highest_used_slotid is still in use.
 361  * When updating highest_used_slotid there may be "holes" in the bitmap
 362  * so we need to scan down from highest_used_slotid to 0 looking for the now
 363  * highest slotid in use.
 364  * If none found, highest_used_slotid is set to -1.
 365  *
 366  * Must be called while holding tbl->slot_tbl_lock
 367  */
 368 static void
 369 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 370 {
 371         int free_slotid = free_slot - tbl->slots;
 372         int slotid = free_slotid;
 373
 374         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 375         /* clear used bit in bitmap */
 376         __clear_bit(slotid, tbl->used_slots);
 377
 378         /* update highest_used_slotid when it is freed */
 379         if (slotid == tbl->highest_used_slotid) {
 380                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 381                 if (slotid < tbl->max_slots)
 382                         tbl->highest_used_slotid = slotid;
 383                 else
 384                         tbl->highest_used_slotid = -1;
 385         }
 386         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 387                 free_slotid, tbl->highest_used_slotid);
 388 }
 389
 390 /*
 391  * Signal state manager thread if session fore channel is drained
 392  */
 393 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 394 {
 395         struct rpc_task *task;
 396
 397         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 398                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 399                 if (task)
 400                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 401                 return;
 402         }
 403
 404         if (ses->fc_slot_table.highest_used_slotid != -1)
 405                 return;
 406
 407         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 408         complete(&ses->fc_slot_table.complete);
 409 }
 410
 411 /*
 412  * Signal state manager thread if session back channel is drained
 413  */
 414 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 415 {
 416         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 417             ses->bc_slot_table.highest_used_slotid != -1)
 418                 return;
 419         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 420         complete(&ses->bc_slot_table.complete);
 421 }
 422
 423 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 424 {
 425         struct nfs4_slot_table *tbl;
 426
 427         tbl = &res->sr_session->fc_slot_table;
 428         if (!res->sr_slot) {
 429                 /* just wake up the next guy waiting since
 430                  * we may have not consumed a slot after all */
 431                 dprintk("%s: No slot\n", __func__);
 432                 return;
 433         }
 434
 435         spin_lock(&tbl->slot_tbl_lock);
 436         nfs4_free_slot(tbl, res->sr_slot);
 437         nfs4_check_drain_fc_complete(res->sr_session);
 438         spin_unlock(&tbl->slot_tbl_lock);
 439         res->sr_slot = NULL;
 440 }
 441
 442 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 443 {
 444         unsigned long timestamp;
 445         struct nfs_client *clp;
 446
 447         /*
 448          * sr_status remains 1 if an RPC level error occurred. The server
 449          * may or may not have processed the sequence operation..
 450          * Proceed as if the server received and processed the sequence
 451          * operation.
 452          */
 453         if (res->sr_status == 1)
 454                 res->sr_status = NFS_OK;
 455
 456         /* don't increment the sequence number if the task wasn't sent */
 457         if (!RPC_WAS_SENT(task))
 458                 goto out;
 459
 460         /* Check the SEQUENCE operation status */
 461         switch (res->sr_status) {
 462         case 0:
 463                 /* Update the slot's sequence and clientid lease timer */
 464                 ++res->sr_slot->seq_nr;
 465                 timestamp = res->sr_renewal_time;
 466                 clp = res->sr_session->clp;
 467                 do_renew_lease(clp, timestamp);
 468                 /* Check sequence flags */
 469                 if (res->sr_status_flags != 0)
 470                         nfs4_schedule_lease_recovery(clp);
 471                 break;
 472         case -NFS4ERR_DELAY:
 473                 /* The server detected a resend of the RPC call and
 474                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 475                  * of RFC5661.
 476                  */
 477                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 478                         __func__,
 479                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 480                         res->sr_slot->seq_nr);
 481                 goto out_retry;
 482         default:
 483                 /* Just update the slot sequence no. */
 484                 ++res->sr_slot->seq_nr;
 485         }
 486 out:
 487         /* The session may be reset by one of the error handlers. */
 488         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 489         nfs41_sequence_free_slot(res);
 490         return 1;
 491 out_retry:
 492         if (!rpc_restart_call(task))
 493                 goto out;
 494         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 495         return 0;
 496 }
 497
 498 static int nfs4_sequence_done(struct rpc_task *task,
 499                                struct nfs4_sequence_res *res)
 500 {
 501         if (res->sr_session == NULL)
 502                 return 1;
 503         return nfs41_sequence_done(task, res);
 504 }
 505
 506 /*
 507  * nfs4_find_slot - efficiently look for a free slot
 508  *
 509  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 510  * If found, we mark the slot as used, update the highest_used_slotid,
 511  * and respectively set up the sequence operation args.
 512  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 513  *
 514  * Note: must be called with under the slot_tbl_lock.
 515  */
 516 static u8
 517 nfs4_find_slot(struct nfs4_slot_table *tbl)
 518 {
 519         int slotid;
 520         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 521         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 522
 523         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 524                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 525                 tbl->max_slots);
 526         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 527         if (slotid >= tbl->max_slots)
 528                 goto out;
 529         __set_bit(slotid, tbl->used_slots);
 530         if (slotid > tbl->highest_used_slotid)
 531                 tbl->highest_used_slotid = slotid;
 532         ret_id = slotid;
 533 out:
 534         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 535                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 536         return ret_id;
 537 }
 538
 539 int nfs41_setup_sequence(struct nfs4_session *session,
 540                                 struct nfs4_sequence_args *args,
 541                                 struct nfs4_sequence_res *res,
 542                                 int cache_reply,
 543                                 struct rpc_task *task)
 544 {
 545         struct nfs4_slot *slot;
 546         struct nfs4_slot_table *tbl;
 547         u8 slotid;
 548
 549         dprintk("--> %s\n", __func__);
 550         /* slot already allocated? */
 551         if (res->sr_slot != NULL)
 552                 return 0;
 553
 554         tbl = &session->fc_slot_table;
 555
 556         spin_lock(&tbl->slot_tbl_lock);
 557         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 558             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 559                 /*
 560                  * The state manager will wait until the slot table is empty.
 561                  * Schedule the reset thread
 562                  */
 563                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 564                 spin_unlock(&tbl->slot_tbl_lock);
 565                 dprintk("%s Schedule Session Reset\n", __func__);
 566                 return -EAGAIN;
 567         }
 568
 569         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 570             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 571                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 572                 spin_unlock(&tbl->slot_tbl_lock);
 573                 dprintk("%s enforce FIFO order\n", __func__);
 574                 return -EAGAIN;
 575         }
 576
 577         slotid = nfs4_find_slot(tbl);
 578         if (slotid == NFS4_MAX_SLOT_TABLE) {
 579                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 580                 spin_unlock(&tbl->slot_tbl_lock);
 581                 dprintk("<-- %s: no free slots\n", __func__);
 582                 return -EAGAIN;
 583         }
 584         spin_unlock(&tbl->slot_tbl_lock);
 585
 586         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 587         slot = tbl->slots + slotid;
 588         args->sa_session = session;
 589         args->sa_slotid = slotid;
 590         args->sa_cache_this = cache_reply;
 591
 592         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 593
 594         res->sr_session = session;
 595         res->sr_slot = slot;
 596         res->sr_renewal_time = jiffies;
 597         res->sr_status_flags = 0;
 598         /*
 599          * sr_status is only set in decode_sequence, and so will remain
 600          * set to 1 if an rpc level failure occurs.
 601          */
 602         res->sr_status = 1;
 603         return 0;
 604 }
 605 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 606
 607 int nfs4_setup_sequence(const struct nfs_server *server,
 608                         struct nfs4_sequence_args *args,
 609                         struct nfs4_sequence_res *res,
 610                         int cache_reply,
 611                         struct rpc_task *task)
 612 {
 613         struct nfs4_session *session = nfs4_get_session(server);
 614         int ret = 0;
 615
 616         if (session == NULL) {
 617                 args->sa_session = NULL;
 618                 res->sr_session = NULL;
 619                 goto out;
 620         }
 621
 622         dprintk("--> %s clp %p session %p sr_slot %td\n",
 623                 __func__, session->clp, session, res->sr_slot ?
 624                         res->sr_slot - session->fc_slot_table.slots : -1);
 625
 626         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 627                                    task);
 628 out:
 629         dprintk("<-- %s status=%d\n", __func__, ret);
 630         return ret;
 631 }
 632
 633 struct nfs41_call_sync_data {
 634         const struct nfs_server *seq_server;
 635         struct nfs4_sequence_args *seq_args;
 636         struct nfs4_sequence_res *seq_res;
 637         int cache_reply;
 638 };
 639
 640 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 641 {
 642         struct nfs41_call_sync_data *data = calldata;
 643
 644         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 645
 646         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 647                                 data->seq_res, data->cache_reply, task))
 648                 return;
 649         rpc_call_start(task);
 650 }
 651
 652 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 653 {
 654         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 655         nfs41_call_sync_prepare(task, calldata);
 656 }
 657
 658 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 659 {
 660         struct nfs41_call_sync_data *data = calldata;
 661
 662         nfs41_sequence_done(task, data->seq_res);
 663 }
 664
 665 struct rpc_call_ops nfs41_call_sync_ops = {
 666         .rpc_call_prepare = nfs41_call_sync_prepare,
 667         .rpc_call_done = nfs41_call_sync_done,
 668 };
 669
 670 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 671         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 672         .rpc_call_done = nfs41_call_sync_done,
 673 };
 674
 675 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 676                                    struct nfs_server *server,
 677                                    struct rpc_message *msg,
 678                                    struct nfs4_sequence_args *args,
 679                                    struct nfs4_sequence_res *res,
 680                                    int cache_reply,
 681                                    int privileged)
 682 {
 683         int ret;
 684         struct rpc_task *task;
 685         struct nfs41_call_sync_data data = {
 686                 .seq_server = server,
 687                 .seq_args = args,
 688                 .seq_res = res,
 689                 .cache_reply = cache_reply,
 690         };
 691         struct rpc_task_setup task_setup = {
 692                 .rpc_client = clnt,
 693                 .rpc_message = msg,
 694                 .callback_ops = &nfs41_call_sync_ops,
 695                 .callback_data = &data
 696         };
 697
 698         res->sr_slot = NULL;
 699         if (privileged)
 700                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 701         task = rpc_run_task(&task_setup);
 702         if (IS_ERR(task))
 703                 ret = PTR_ERR(task);
 704         else {
 705                 ret = task->tk_status;
 706                 rpc_put_task(task);
 707         }
 708         return ret;
 709 }
 710
 711 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 712                             struct nfs_server *server,
 713                             struct rpc_message *msg,
 714                             struct nfs4_sequence_args *args,
 715                             struct nfs4_sequence_res *res,
 716                             int cache_reply)
 717 {
 718         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 719 }
 720
 721 #else
 722 static int nfs4_sequence_done(struct rpc_task *task,
 723                                struct nfs4_sequence_res *res)
 724 {
 725         return 1;
 726 }
 727 #endif /* CONFIG_NFS_V4_1 */
 728
 729 int _nfs4_call_sync(struct rpc_clnt *clnt,
 730                     struct nfs_server *server,
 731                     struct rpc_message *msg,
 732                     struct nfs4_sequence_args *args,
 733                     struct nfs4_sequence_res *res,
 734                     int cache_reply)
 735 {
 736         args->sa_session = res->sr_session = NULL;
 737         return rpc_call_sync(clnt, msg, 0);
 738 }
 739
 740 static inline
 741 int nfs4_call_sync(struct rpc_clnt *clnt,
 742                    struct nfs_server *server,
 743                    struct rpc_message *msg,
 744                    struct nfs4_sequence_args *args,
 745                    struct nfs4_sequence_res *res,
 746                    int cache_reply)
 747 {
 748         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 749                                                 args, res, cache_reply);
 750 }
 751
 752 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 753 {
 754         struct nfs_inode *nfsi = NFS_I(dir);
 755
 756         spin_lock(&dir->i_lock);
 757         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 758         if (!cinfo->atomic || cinfo->before != dir->i_version)
 759                 nfs_force_lookup_revalidate(dir);
 760         dir->i_version = cinfo->after;
 761         spin_unlock(&dir->i_lock);
 762 }
 763
 764 struct nfs4_opendata {
 765         struct kref kref;
 766         struct nfs_openargs o_arg;
 767         struct nfs_openres o_res;
 768         struct nfs_open_confirmargs c_arg;
 769         struct nfs_open_confirmres c_res;
 770         struct nfs_fattr f_attr;
 771         struct nfs_fattr dir_attr;
 772         struct dentry *dir;
 773         struct dentry *dentry;
 774         struct nfs4_state_owner *owner;
 775         struct nfs4_state *state;
 776         struct iattr attrs;
 777         unsigned long timestamp;
 778         unsigned int rpc_done : 1;
 779         int rpc_status;
 780         int cancelled;
 781 };
 782
 783
 784 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 785 {
 786         p->o_res.f_attr = &p->f_attr;
 787         p->o_res.dir_attr = &p->dir_attr;
 788         p->o_res.seqid = p->o_arg.seqid;
 789         p->c_res.seqid = p->c_arg.seqid;
 790         p->o_res.server = p->o_arg.server;
 791         nfs_fattr_init(&p->f_attr);
 792         nfs_fattr_init(&p->dir_attr);
 793 }
 794
 795 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 796                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 797                 const struct iattr *attrs,
 798                 gfp_t gfp_mask)
 799 {
 800         struct dentry *parent = dget_parent(dentry);
 801         struct inode *dir = parent->d_inode;
 802         struct nfs_server *server = NFS_SERVER(dir);
 803         struct nfs4_opendata *p;
 804
 805         p = kzalloc(sizeof(*p), gfp_mask);
 806         if (p == NULL)
 807                 goto err;
 808         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 809         if (p->o_arg.seqid == NULL)
 810                 goto err_free;
 811         nfs_sb_active(dentry->d_sb);
 812         p->dentry = dget(dentry);
 813         p->dir = parent;
 814         p->owner = sp;
 815         atomic_inc(&sp->so_count);
 816         p->o_arg.fh = NFS_FH(dir);
 817         p->o_arg.open_flags = flags;
 818         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 819         p->o_arg.clientid = server->nfs_client->cl_clientid;
 820         p->o_arg.id = sp->so_owner_id.id;
 821         p->o_arg.name = &dentry->d_name;
 822         p->o_arg.server = server;
 823         p->o_arg.bitmask = server->attr_bitmask;
 824         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 825         if (flags & O_CREAT) {
 826                 u32 *s;
 827
 828                 p->o_arg.u.attrs = &p->attrs;
 829                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 830                 s = (u32 *) p->o_arg.u.verifier.data;
 831                 s[0] = jiffies;
 832                 s[1] = current->pid;
 833         }
 834         p->c_arg.fh = &p->o_res.fh;
 835         p->c_arg.stateid = &p->o_res.stateid;
 836         p->c_arg.seqid = p->o_arg.seqid;
 837         nfs4_init_opendata_res(p);
 838         kref_init(&p->kref);
 839         return p;
 840 err_free:
 841         kfree(p);
 842 err:
 843         dput(parent);
 844         return NULL;
 845 }
 846
 847 static void nfs4_opendata_free(struct kref *kref)
 848 {
 849         struct nfs4_opendata *p = container_of(kref,
 850                         struct nfs4_opendata, kref);
 851         struct super_block *sb = p->dentry->d_sb;
 852
 853         nfs_free_seqid(p->o_arg.seqid);
 854         if (p->state != NULL)
 855                 nfs4_put_open_state(p->state);
 856         nfs4_put_state_owner(p->owner);
 857         dput(p->dir);
 858         dput(p->dentry);
 859         nfs_sb_deactive(sb);
 860         kfree(p);
 861 }
 862
 863 static void nfs4_opendata_put(struct nfs4_opendata *p)
 864 {
 865         if (p != NULL)
 866                 kref_put(&p->kref, nfs4_opendata_free);
 867 }
 868
 869 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 870 {
 871         int ret;
 872
 873         ret = rpc_wait_for_completion_task(task);
 874         return ret;
 875 }
 876
 877 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 878 {
 879         int ret = 0;
 880
 881         if (open_mode & O_EXCL)
 882                 goto out;
 883         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 884                 case FMODE_READ:
 885                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 886                                 && state->n_rdonly != 0;
 887                         break;
 888                 case FMODE_WRITE:
 889                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 890                                 && state->n_wronly != 0;
 891                         break;
 892                 case FMODE_READ|FMODE_WRITE:
 893                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 894                                 && state->n_rdwr != 0;
 895         }
 896 out:
 897         return ret;
 898 }
 899
 900 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 901 {
 902         if (delegation == NULL)
 903                 return 0;
 904         if ((delegation->type & fmode) != fmode)
 905                 return 0;
 906         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 907                 return 0;
 908         nfs_mark_delegation_referenced(delegation);
 909         return 1;
 910 }
 911
 912 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 913 {
 914         switch (fmode) {
 915                 case FMODE_WRITE:
 916                         state->n_wronly++;
 917                         break;
 918                 case FMODE_READ:
 919                         state->n_rdonly++;
 920                         break;
 921                 case FMODE_READ|FMODE_WRITE:
 922                         state->n_rdwr++;
 923         }
 924         nfs4_state_set_mode_locked(state, state->state | fmode);
 925 }
 926
 927 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 928 {
 929         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 930                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 931         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 932         switch (fmode) {
 933                 case FMODE_READ:
 934                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 935                         break;
 936                 case FMODE_WRITE:
 937                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 938                         break;
 939                 case FMODE_READ|FMODE_WRITE:
 940                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 941         }
 942 }
 943
 944 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 945 {
 946         write_seqlock(&state->seqlock);
 947         nfs_set_open_stateid_locked(state, stateid, fmode);
 948         write_sequnlock(&state->seqlock);
 949 }
 950
 951 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 952 {
 953         /*
 954          * Protect the call to nfs4_state_set_mode_locked and
 955          * serialise the stateid update
 956          */
 957         write_seqlock(&state->seqlock);
 958         if (deleg_stateid != NULL) {
 959                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 960                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 961         }
 962         if (open_stateid != NULL)
 963                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 964         write_sequnlock(&state->seqlock);
 965         spin_lock(&state->owner->so_lock);
 966         update_open_stateflags(state, fmode);
 967         spin_unlock(&state->owner->so_lock);
 968 }
 969
 970 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 971 {
 972         struct nfs_inode *nfsi = NFS_I(state->inode);
 973         struct nfs_delegation *deleg_cur;
 974         int ret = 0;
 975
 976         fmode &= (FMODE_READ|FMODE_WRITE);
 977
 978         rcu_read_lock();
 979         deleg_cur = rcu_dereference(nfsi->delegation);
 980         if (deleg_cur == NULL)
 981                 goto no_delegation;
 982
 983         spin_lock(&deleg_cur->lock);
 984         if (nfsi->delegation != deleg_cur ||
 985             (deleg_cur->type & fmode) != fmode)
 986                 goto no_delegation_unlock;
 987
 988         if (delegation == NULL)
 989                 delegation = &deleg_cur->stateid;
 990         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 991                 goto no_delegation_unlock;
 992
 993         nfs_mark_delegation_referenced(deleg_cur);
 994         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 995         ret = 1;
 996 no_delegation_unlock:
 997         spin_unlock(&deleg_cur->lock);
 998 no_delegation:
 999         rcu_read_unlock();
1000
1001         if (!ret && open_stateid != NULL) {
1002                 __update_open_stateid(state, open_stateid, NULL, fmode);
1003                 ret = 1;
1004         }
1005
1006         return ret;
1007 }
1008
1009
1010 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1011 {
1012         struct nfs_delegation *delegation;
1013
1014         rcu_read_lock();
1015         delegation = rcu_dereference(NFS_I(inode)->delegation);
1016         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1017                 rcu_read_unlock();
1018                 return;
1019         }
1020         rcu_read_unlock();
1021         nfs_inode_return_delegation(inode);
1022 }
1023
1024 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1025 {
1026         struct nfs4_state *state = opendata->state;
1027         struct nfs_inode *nfsi = NFS_I(state->inode);
1028         struct nfs_delegation *delegation;
1029         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1030         fmode_t fmode = opendata->o_arg.fmode;
1031         nfs4_stateid stateid;
1032         int ret = -EAGAIN;
1033
1034         for (;;) {
1035                 if (can_open_cached(state, fmode, open_mode)) {
1036                         spin_lock(&state->owner->so_lock);
1037                         if (can_open_cached(state, fmode, open_mode)) {
1038                                 update_open_stateflags(state, fmode);
1039                                 spin_unlock(&state->owner->so_lock);
1040                                 goto out_return_state;
1041                         }
1042                         spin_unlock(&state->owner->so_lock);
1043                 }
1044                 rcu_read_lock();
1045                 delegation = rcu_dereference(nfsi->delegation);
1046                 if (!can_open_delegated(delegation, fmode)) {
1047                         rcu_read_unlock();
1048                         break;
1049                 }
1050                 /* Save the delegation */
1051                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1052                 rcu_read_unlock();
1053                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1054                 if (ret != 0)
1055                         goto out;
1056                 ret = -EAGAIN;
1057
1058                 /* Try to update the stateid using the delegation */
1059                 if (update_open_stateid(state, NULL, &stateid, fmode))
1060                         goto out_return_state;
1061         }
1062 out:
1063         return ERR_PTR(ret);
1064 out_return_state:
1065         atomic_inc(&state->count);
1066         return state;
1067 }
1068
1069 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1070 {
1071         struct inode *inode;
1072         struct nfs4_state *state = NULL;
1073         struct nfs_delegation *delegation;
1074         int ret;
1075
1076         if (!data->rpc_done) {
1077                 state = nfs4_try_open_cached(data);
1078                 goto out;
1079         }
1080
1081         ret = -EAGAIN;
1082         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1083                 goto err;
1084         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1085         ret = PTR_ERR(inode);
1086         if (IS_ERR(inode))
1087                 goto err;
1088         ret = -ENOMEM;
1089         state = nfs4_get_open_state(inode, data->owner);
1090         if (state == NULL)
1091                 goto err_put_inode;
1092         if (data->o_res.delegation_type != 0) {
1093                 int delegation_flags = 0;
1094
1095                 rcu_read_lock();
1096                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1097                 if (delegation)
1098                         delegation_flags = delegation->flags;
1099                 rcu_read_unlock();
1100                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1101                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1102                                         "returning a delegation for "
1103                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1104                                         NFS_CLIENT(inode)->cl_server);
1105                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1106                         nfs_inode_set_delegation(state->inode,
1107                                         data->owner->so_cred,
1108                                         &data->o_res);
1109                 else
1110                         nfs_inode_reclaim_delegation(state->inode,
1111                                         data->owner->so_cred,
1112                                         &data->o_res);
1113         }
1114
1115         update_open_stateid(state, &data->o_res.stateid, NULL,
1116                         data->o_arg.fmode);
1117         iput(inode);
1118 out:
1119         return state;
1120 err_put_inode:
1121         iput(inode);
1122 err:
1123         return ERR_PTR(ret);
1124 }
1125
1126 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1127 {
1128         struct nfs_inode *nfsi = NFS_I(state->inode);
1129         struct nfs_open_context *ctx;
1130
1131         spin_lock(&state->inode->i_lock);
1132         list_for_each_entry(ctx, &nfsi->open_files, list) {
1133                 if (ctx->state != state)
1134                         continue;
1135                 get_nfs_open_context(ctx);
1136                 spin_unlock(&state->inode->i_lock);
1137                 return ctx;
1138         }
1139         spin_unlock(&state->inode->i_lock);
1140         return ERR_PTR(-ENOENT);
1141 }
1142
1143 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1144 {
1145         struct nfs4_opendata *opendata;
1146
1147         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1148         if (opendata == NULL)
1149                 return ERR_PTR(-ENOMEM);
1150         opendata->state = state;
1151         atomic_inc(&state->count);
1152         return opendata;
1153 }
1154
1155 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1156 {
1157         struct nfs4_state *newstate;
1158         int ret;
1159
1160         opendata->o_arg.open_flags = 0;
1161         opendata->o_arg.fmode = fmode;
1162         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1163         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1164         nfs4_init_opendata_res(opendata);
1165         ret = _nfs4_recover_proc_open(opendata);
1166         if (ret != 0)
1167                 return ret;
1168         newstate = nfs4_opendata_to_nfs4_state(opendata);
1169         if (IS_ERR(newstate))
1170                 return PTR_ERR(newstate);
1171         nfs4_close_state(newstate, fmode);
1172         *res = newstate;
1173         return 0;
1174 }
1175
1176 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1177 {
1178         struct nfs4_state *newstate;
1179         int ret;
1180
1181         /* memory barrier prior to reading state->n_* */
1182         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1183         smp_rmb();
1184         if (state->n_rdwr != 0) {
1185                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1186                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1187                 if (ret != 0)
1188                         return ret;
1189                 if (newstate != state)
1190                         return -ESTALE;
1191         }
1192         if (state->n_wronly != 0) {
1193                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1194                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1195                 if (ret != 0)
1196                         return ret;
1197                 if (newstate != state)
1198                         return -ESTALE;
1199         }
1200         if (state->n_rdonly != 0) {
1201                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1202                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1203                 if (ret != 0)
1204                         return ret;
1205                 if (newstate != state)
1206                         return -ESTALE;
1207         }
1208         /*
1209          * We may have performed cached opens for all three recoveries.
1210          * Check if we need to update the current stateid.
1211          */
1212         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1213             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1214                 write_seqlock(&state->seqlock);
1215                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1216                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1217                 write_sequnlock(&state->seqlock);
1218         }
1219         return 0;
1220 }
1221
1222 /*
1223  * OPEN_RECLAIM:
1224  *      reclaim state on the server after a reboot.
1225  */
1226 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1227 {
1228         struct nfs_delegation *delegation;
1229         struct nfs4_opendata *opendata;
1230         fmode_t delegation_type = 0;
1231         int status;
1232
1233         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1234         if (IS_ERR(opendata))
1235                 return PTR_ERR(opendata);
1236         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1237         opendata->o_arg.fh = NFS_FH(state->inode);
1238         rcu_read_lock();
1239         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1240         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1241                 delegation_type = delegation->type;
1242         rcu_read_unlock();
1243         opendata->o_arg.u.delegation_type = delegation_type;
1244         status = nfs4_open_recover(opendata, state);
1245         nfs4_opendata_put(opendata);
1246         return status;
1247 }
1248
1249 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1250 {
1251         struct nfs_server *server = NFS_SERVER(state->inode);
1252         struct nfs4_exception exception = { };
1253         int err;
1254         do {
1255                 err = _nfs4_do_open_reclaim(ctx, state);
1256                 if (err != -NFS4ERR_DELAY)
1257                         break;
1258                 nfs4_handle_exception(server, err, &exception);
1259         } while (exception.retry);
1260         return err;
1261 }
1262
1263 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1264 {
1265         struct nfs_open_context *ctx;
1266         int ret;
1267
1268         ctx = nfs4_state_find_open_context(state);
1269         if (IS_ERR(ctx))
1270                 return PTR_ERR(ctx);
1271         ret = nfs4_do_open_reclaim(ctx, state);
1272         put_nfs_open_context(ctx);
1273         return ret;
1274 }
1275
1276 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1277 {
1278         struct nfs4_opendata *opendata;
1279         int ret;
1280
1281         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1282         if (IS_ERR(opendata))
1283                 return PTR_ERR(opendata);
1284         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1285         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1286                         sizeof(opendata->o_arg.u.delegation.data));
1287         ret = nfs4_open_recover(opendata, state);
1288         nfs4_opendata_put(opendata);
1289         return ret;
1290 }
1291
1292 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1293 {
1294         struct nfs4_exception exception = { };
1295         struct nfs_server *server = NFS_SERVER(state->inode);
1296         int err;
1297         do {
1298                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1299                 switch (err) {
1300                         case 0:
1301                         case -ENOENT:
1302                         case -ESTALE:
1303                                 goto out;
1304                         case -NFS4ERR_BADSESSION:
1305                         case -NFS4ERR_BADSLOT:
1306                         case -NFS4ERR_BAD_HIGH_SLOT:
1307                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1308                         case -NFS4ERR_DEADSESSION:
1309                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1310                                 goto out;
1311                         case -NFS4ERR_STALE_CLIENTID:
1312                         case -NFS4ERR_STALE_STATEID:
1313                         case -NFS4ERR_EXPIRED:
1314                                 /* Don't recall a delegation if it was lost */
1315                                 nfs4_schedule_lease_recovery(server->nfs_client);
1316                                 goto out;
1317                         case -ERESTARTSYS:
1318                                 /*
1319                                  * The show must go on: exit, but mark the
1320                                  * stateid as needing recovery.
1321                                  */
1322                         case -NFS4ERR_DELEG_REVOKED:
1323                         case -NFS4ERR_ADMIN_REVOKED:
1324                         case -NFS4ERR_BAD_STATEID:
1325                                 nfs_inode_find_state_and_recover(state->inode,
1326                                                 stateid);
1327                                 nfs4_schedule_stateid_recovery(server, state);
1328                         case -EKEYEXPIRED:
1329                                 /*
1330                                  * User RPCSEC_GSS context has expired.
1331                                  * We cannot recover this stateid now, so
1332                                  * skip it and allow recovery thread to
1333                                  * proceed.
1334                                  */
1335                         case -ENOMEM:
1336                                 err = 0;
1337                                 goto out;
1338                 }
1339                 err = nfs4_handle_exception(server, err, &exception);
1340         } while (exception.retry);
1341 out:
1342         return err;
1343 }
1344
1345 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1346 {
1347         struct nfs4_opendata *data = calldata;
1348
1349         data->rpc_status = task->tk_status;
1350         if (data->rpc_status == 0) {
1351                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1352                                 sizeof(data->o_res.stateid.data));
1353                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1354                 renew_lease(data->o_res.server, data->timestamp);
1355                 data->rpc_done = 1;
1356         }
1357 }
1358
1359 static void nfs4_open_confirm_release(void *calldata)
1360 {
1361         struct nfs4_opendata *data = calldata;
1362         struct nfs4_state *state = NULL;
1363
1364         /* If this request hasn't been cancelled, do nothing */
1365         if (data->cancelled == 0)
1366                 goto out_free;
1367         /* In case of error, no cleanup! */
1368         if (!data->rpc_done)
1369                 goto out_free;
1370         state = nfs4_opendata_to_nfs4_state(data);
1371         if (!IS_ERR(state))
1372                 nfs4_close_state(state, data->o_arg.fmode);
1373 out_free:
1374         nfs4_opendata_put(data);
1375 }
1376
1377 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1378         .rpc_call_done = nfs4_open_confirm_done,
1379         .rpc_release = nfs4_open_confirm_release,
1380 };
1381
1382 /*
1383  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1384  */
1385 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1386 {
1387         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1388         struct rpc_task *task;
1389         struct  rpc_message msg = {
1390                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1391                 .rpc_argp = &data->c_arg,
1392                 .rpc_resp = &data->c_res,
1393                 .rpc_cred = data->owner->so_cred,
1394         };
1395         struct rpc_task_setup task_setup_data = {
1396                 .rpc_client = server->client,
1397                 .rpc_message = &msg,
1398                 .callback_ops = &nfs4_open_confirm_ops,
1399                 .callback_data = data,
1400                 .workqueue = nfsiod_workqueue,
1401                 .flags = RPC_TASK_ASYNC,
1402         };
1403         int status;
1404
1405         kref_get(&data->kref);
1406         data->rpc_done = 0;
1407         data->rpc_status = 0;
1408         data->timestamp = jiffies;
1409         task = rpc_run_task(&task_setup_data);
1410         if (IS_ERR(task))
1411                 return PTR_ERR(task);
1412         status = nfs4_wait_for_completion_rpc_task(task);
1413         if (status != 0) {
1414                 data->cancelled = 1;
1415                 smp_wmb();
1416         } else
1417                 status = data->rpc_status;
1418         rpc_put_task(task);
1419         return status;
1420 }
1421
1422 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1423 {
1424         struct nfs4_opendata *data = calldata;
1425         struct nfs4_state_owner *sp = data->owner;
1426
1427         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1428                 return;
1429         /*
1430          * Check if we still need to send an OPEN call, or if we can use
1431          * a delegation instead.
1432          */
1433         if (data->state != NULL) {
1434                 struct nfs_delegation *delegation;
1435
1436                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1437                         goto out_no_action;
1438                 rcu_read_lock();
1439                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1440                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1441                     can_open_delegated(delegation, data->o_arg.fmode))
1442                         goto unlock_no_action;
1443                 rcu_read_unlock();
1444         }
1445         /* Update sequence id. */
1446         data->o_arg.id = sp->so_owner_id.id;
1447         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1448         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1449                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1450                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1451         }
1452         data->timestamp = jiffies;
1453         if (nfs4_setup_sequence(data->o_arg.server,
1454                                 &data->o_arg.seq_args,
1455                                 &data->o_res.seq_res, 1, task))
1456                 return;
1457         rpc_call_start(task);
1458         return;
1459 unlock_no_action:
1460         rcu_read_unlock();
1461 out_no_action:
1462         task->tk_action = NULL;
1463
1464 }
1465
1466 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1467 {
1468         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1469         nfs4_open_prepare(task, calldata);
1470 }
1471
1472 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1473 {
1474         struct nfs4_opendata *data = calldata;
1475
1476         data->rpc_status = task->tk_status;
1477
1478         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1479                 return;
1480
1481         if (task->tk_status == 0) {
1482                 switch (data->o_res.f_attr->mode & S_IFMT) {
1483                         case S_IFREG:
1484                                 break;
1485                         case S_IFLNK:
1486                                 data->rpc_status = -ELOOP;
1487                                 break;
1488                         case S_IFDIR:
1489                                 data->rpc_status = -EISDIR;
1490                                 break;
1491                         default:
1492                                 data->rpc_status = -ENOTDIR;
1493                 }
1494                 renew_lease(data->o_res.server, data->timestamp);
1495                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1496                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1497         }
1498         data->rpc_done = 1;
1499 }
1500
1501 static void nfs4_open_release(void *calldata)
1502 {
1503         struct nfs4_opendata *data = calldata;
1504         struct nfs4_state *state = NULL;
1505
1506         /* If this request hasn't been cancelled, do nothing */
1507         if (data->cancelled == 0)
1508                 goto out_free;
1509         /* In case of error, no cleanup! */
1510         if (data->rpc_status != 0 || !data->rpc_done)
1511                 goto out_free;
1512         /* In case we need an open_confirm, no cleanup! */
1513         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1514                 goto out_free;
1515         state = nfs4_opendata_to_nfs4_state(data);
1516         if (!IS_ERR(state))
1517                 nfs4_close_state(state, data->o_arg.fmode);
1518 out_free:
1519         nfs4_opendata_put(data);
1520 }
1521
1522 static const struct rpc_call_ops nfs4_open_ops = {
1523         .rpc_call_prepare = nfs4_open_prepare,
1524         .rpc_call_done = nfs4_open_done,
1525         .rpc_release = nfs4_open_release,
1526 };
1527
1528 static const struct rpc_call_ops nfs4_recover_open_ops = {
1529         .rpc_call_prepare = nfs4_recover_open_prepare,
1530         .rpc_call_done = nfs4_open_done,
1531         .rpc_release = nfs4_open_release,
1532 };
1533
1534 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1535 {
1536         struct inode *dir = data->dir->d_inode;
1537         struct nfs_server *server = NFS_SERVER(dir);
1538         struct nfs_openargs *o_arg = &data->o_arg;
1539         struct nfs_openres *o_res = &data->o_res;
1540         struct rpc_task *task;
1541         struct rpc_message msg = {
1542                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1543                 .rpc_argp = o_arg,
1544                 .rpc_resp = o_res,
1545                 .rpc_cred = data->owner->so_cred,
1546         };
1547         struct rpc_task_setup task_setup_data = {
1548                 .rpc_client = server->client,
1549                 .rpc_message = &msg,
1550                 .callback_ops = &nfs4_open_ops,
1551                 .callback_data = data,
1552                 .workqueue = nfsiod_workqueue,
1553                 .flags = RPC_TASK_ASYNC,
1554         };
1555         int status;
1556
1557         kref_get(&data->kref);
1558         data->rpc_done = 0;
1559         data->rpc_status = 0;
1560         data->cancelled = 0;
1561         if (isrecover)
1562                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1563         task = rpc_run_task(&task_setup_data);
1564         if (IS_ERR(task))
1565                 return PTR_ERR(task);
1566         status = nfs4_wait_for_completion_rpc_task(task);
1567         if (status != 0) {
1568                 data->cancelled = 1;
1569                 smp_wmb();
1570         } else
1571                 status = data->rpc_status;
1572         rpc_put_task(task);
1573
1574         return status;
1575 }
1576
1577 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1578 {
1579         struct inode *dir = data->dir->d_inode;
1580         struct nfs_openres *o_res = &data->o_res;
1581         int status;
1582
1583         status = nfs4_run_open_task(data, 1);
1584         if (status != 0 || !data->rpc_done)
1585                 return status;
1586
1587         nfs_refresh_inode(dir, o_res->dir_attr);
1588
1589         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1590                 status = _nfs4_proc_open_confirm(data);
1591                 if (status != 0)
1592                         return status;
1593         }
1594
1595         return status;
1596 }
1597
1598 /*
1599  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1600  */
1601 static int _nfs4_proc_open(struct nfs4_opendata *data)
1602 {
1603         struct inode *dir = data->dir->d_inode;
1604         struct nfs_server *server = NFS_SERVER(dir);
1605         struct nfs_openargs *o_arg = &data->o_arg;
1606         struct nfs_openres *o_res = &data->o_res;
1607         int status;
1608
1609         status = nfs4_run_open_task(data, 0);
1610         if (!data->rpc_done)
1611                 return status;
1612         if (status != 0) {
1613                 if (status == -NFS4ERR_BADNAME &&
1614                                 !(o_arg->open_flags & O_CREAT))
1615                         return -ENOENT;
1616                 return status;
1617         }
1618
1619         if (o_arg->open_flags & O_CREAT) {
1620                 update_changeattr(dir, &o_res->cinfo);
1621                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1622         } else
1623                 nfs_refresh_inode(dir, o_res->dir_attr);
1624         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1625                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1626         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1627                 status = _nfs4_proc_open_confirm(data);
1628                 if (status != 0)
1629                         return status;
1630         }
1631         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1632                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1633         return 0;
1634 }
1635
1636 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1637 {
1638         unsigned int loop;
1639         int ret;
1640
1641         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1642                 ret = nfs4_wait_clnt_recover(clp);
1643                 if (ret != 0)
1644                         break;
1645                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1646                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1647                         break;
1648                 nfs4_schedule_state_manager(clp);
1649                 ret = -EIO;
1650         }
1651         return ret;
1652 }
1653
1654 static int nfs4_recover_expired_lease(struct nfs_server *server)
1655 {
1656         return nfs4_client_recover_expired_lease(server->nfs_client);
1657 }
1658
1659 /*
1660  * OPEN_EXPIRED:
1661  *      reclaim state on the server after a network partition.
1662  *      Assumes caller holds the appropriate lock
1663  */
1664 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1665 {
1666         struct nfs4_opendata *opendata;
1667         int ret;
1668
1669         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1670         if (IS_ERR(opendata))
1671                 return PTR_ERR(opendata);
1672         ret = nfs4_open_recover(opendata, state);
1673         if (ret == -ESTALE)
1674                 d_drop(ctx->dentry);
1675         nfs4_opendata_put(opendata);
1676         return ret;
1677 }
1678
1679 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1680 {
1681         struct nfs_server *server = NFS_SERVER(state->inode);
1682         struct nfs4_exception exception = { };
1683         int err;
1684
1685         do {
1686                 err = _nfs4_open_expired(ctx, state);
1687                 switch (err) {
1688                 default:
1689                         goto out;
1690                 case -NFS4ERR_GRACE:
1691                 case -NFS4ERR_DELAY:
1692                         nfs4_handle_exception(server, err, &exception);
1693                         err = 0;
1694                 }
1695         } while (exception.retry);
1696 out:
1697         return err;
1698 }
1699
1700 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1701 {
1702         struct nfs_open_context *ctx;
1703         int ret;
1704
1705         ctx = nfs4_state_find_open_context(state);
1706         if (IS_ERR(ctx))
1707                 return PTR_ERR(ctx);
1708         ret = nfs4_do_open_expired(ctx, state);
1709         put_nfs_open_context(ctx);
1710         return ret;
1711 }
1712
1713 #if defined(CONFIG_NFS_V4_1)
1714 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1715 {
1716         int status;
1717         struct nfs_server *server = NFS_SERVER(state->inode);
1718
1719         status = nfs41_test_stateid(server, state);
1720         if (status == NFS_OK)
1721                 return 0;
1722         nfs41_free_stateid(server, state);
1723         return nfs4_open_expired(sp, state);
1724 }
1725 #endif
1726
1727 /*
1728  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1729  * fields corresponding to attributes that were used to store the verifier.
1730  * Make sure we clobber those fields in the later setattr call
1731  */
1732 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1733 {
1734         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1735             !(sattr->ia_valid & ATTR_ATIME_SET))
1736                 sattr->ia_valid |= ATTR_ATIME;
1737
1738         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1739             !(sattr->ia_valid & ATTR_MTIME_SET))
1740                 sattr->ia_valid |= ATTR_MTIME;
1741 }
1742
1743 /*
1744  * Returns a referenced nfs4_state
1745  */
1746 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)
1747 {
1748         struct nfs4_state_owner  *sp;
1749         struct nfs4_state     *state = NULL;
1750         struct nfs_server       *server = NFS_SERVER(dir);
1751         struct nfs4_opendata *opendata;
1752         int status;
1753
1754         /* Protect against reboot recovery conflicts */
1755         status = -ENOMEM;
1756         if (!(sp = nfs4_get_state_owner(server, cred))) {
1757                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1758                 goto out_err;
1759         }
1760         status = nfs4_recover_expired_lease(server);
1761         if (status != 0)
1762                 goto err_put_state_owner;
1763         if (dentry->d_inode != NULL)
1764                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1765         status = -ENOMEM;
1766         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1767         if (opendata == NULL)
1768                 goto err_put_state_owner;
1769
1770         if (dentry->d_inode != NULL)
1771                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1772
1773         status = _nfs4_proc_open(opendata);
1774         if (status != 0)
1775                 goto err_opendata_put;
1776
1777         state = nfs4_opendata_to_nfs4_state(opendata);
1778         status = PTR_ERR(state);
1779         if (IS_ERR(state))
1780                 goto err_opendata_put;
1781         if (server->caps & NFS_CAP_POSIX_LOCK)
1782                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1783
1784         if (opendata->o_arg.open_flags & O_EXCL) {
1785                 nfs4_exclusive_attrset(opendata, sattr);
1786
1787                 nfs_fattr_init(opendata->o_res.f_attr);
1788                 status = nfs4_do_setattr(state->inode, cred,
1789                                 opendata->o_res.f_attr, sattr,
1790                                 state);
1791                 if (status == 0)
1792                         nfs_setattr_update_inode(state->inode, sattr);
1793                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1794         }
1795         nfs4_opendata_put(opendata);
1796         nfs4_put_state_owner(sp);
1797         *res = state;
1798         return 0;
1799 err_opendata_put:
1800         nfs4_opendata_put(opendata);
1801 err_put_state_owner:
1802         nfs4_put_state_owner(sp);
1803 out_err:
1804         *res = NULL;
1805         return status;
1806 }
1807
1808
1809 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)
1810 {
1811         struct nfs4_exception exception = { };
1812         struct nfs4_state *res;
1813         int status;
1814
1815         do {
1816                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1817                 if (status == 0)
1818                         break;
1819                 /* NOTE: BAD_SEQID means the server and client disagree about the
1820                  * book-keeping w.r.t. state-changing operations
1821                  * (OPEN/CLOSE/LOCK/LOCKU...)
1822                  * It is actually a sign of a bug on the client or on the server.
1823                  *
1824                  * If we receive a BAD_SEQID error in the particular case of
1825                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1826                  * have unhashed the old state_owner for us, and that we can
1827                  * therefore safely retry using a new one. We should still warn
1828                  * the user though...
1829                  */
1830                 if (status == -NFS4ERR_BAD_SEQID) {
1831                         printk(KERN_WARNING "NFS: v4 server %s "
1832                                         " returned a bad sequence-id error!\n",
1833                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1834                         exception.retry = 1;
1835                         continue;
1836                 }
1837                 /*
1838                  * BAD_STATEID on OPEN means that the server cancelled our
1839                  * state before it received the OPEN_CONFIRM.
1840                  * Recover by retrying the request as per the discussion
1841                  * on Page 181 of RFC3530.
1842                  */
1843                 if (status == -NFS4ERR_BAD_STATEID) {
1844                         exception.retry = 1;
1845                         continue;
1846                 }
1847                 if (status == -EAGAIN) {
1848                         /* We must have found a delegation */
1849                         exception.retry = 1;
1850                         continue;
1851                 }
1852                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1853                                         status, &exception));
1854         } while (exception.retry);
1855         return res;
1856 }
1857
1858 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1859                             struct nfs_fattr *fattr, struct iattr *sattr,
1860                             struct nfs4_state *state)
1861 {
1862         struct nfs_server *server = NFS_SERVER(inode);
1863         struct nfs_setattrargs  arg = {
1864                 .fh             = NFS_FH(inode),
1865                 .iap            = sattr,
1866                 .server         = server,
1867                 .bitmask = server->attr_bitmask,
1868         };
1869         struct nfs_setattrres  res = {
1870                 .fattr          = fattr,
1871                 .server         = server,
1872         };
1873         struct rpc_message msg = {
1874                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1875                 .rpc_argp       = &arg,
1876                 .rpc_resp       = &res,
1877                 .rpc_cred       = cred,
1878         };
1879         unsigned long timestamp = jiffies;
1880         int status;
1881
1882         nfs_fattr_init(fattr);
1883
1884         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1885                 /* Use that stateid */
1886         } else if (state != NULL) {
1887                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1888         } else
1889                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1890
1891         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1892         if (status == 0 && state != NULL)
1893                 renew_lease(server, timestamp);
1894         return status;
1895 }
1896
1897 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1898                            struct nfs_fattr *fattr, struct iattr *sattr,
1899                            struct nfs4_state *state)
1900 {
1901         struct nfs_server *server = NFS_SERVER(inode);
1902         struct nfs4_exception exception = {
1903                 .state = state,
1904         };
1905         int err;
1906         do {
1907                 err = nfs4_handle_exception(server,
1908                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1909                                 &exception);
1910         } while (exception.retry);
1911         return err;
1912 }
1913
1914 struct nfs4_closedata {
1915         struct inode *inode;
1916         struct nfs4_state *state;
1917         struct nfs_closeargs arg;
1918         struct nfs_closeres res;
1919         struct nfs_fattr fattr;
1920         unsigned long timestamp;
1921         bool roc;
1922         u32 roc_barrier;
1923 };
1924
1925 static void nfs4_free_closedata(void *data)
1926 {
1927         struct nfs4_closedata *calldata = data;
1928         struct nfs4_state_owner *sp = calldata->state->owner;
1929         struct super_block *sb = calldata->state->inode->i_sb;
1930
1931         if (calldata->roc)
1932                 pnfs_roc_release(calldata->state->inode);
1933         nfs4_put_open_state(calldata->state);
1934         nfs_free_seqid(calldata->arg.seqid);
1935         nfs4_put_state_owner(sp);
1936         nfs_sb_deactive(sb);
1937         kfree(calldata);
1938 }
1939
1940 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1941                 fmode_t fmode)
1942 {
1943         spin_lock(&state->owner->so_lock);
1944         if (!(fmode & FMODE_READ))
1945                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1946         if (!(fmode & FMODE_WRITE))
1947                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1948         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1949         spin_unlock(&state->owner->so_lock);
1950 }
1951
1952 static void nfs4_close_done(struct rpc_task *task, void *data)
1953 {
1954         struct nfs4_closedata *calldata = data;
1955         struct nfs4_state *state = calldata->state;
1956         struct nfs_server *server = NFS_SERVER(calldata->inode);
1957
1958         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1959                 return;
1960         /* hmm. we are done with the inode, and in the process of freeing
1961          * the state_owner. we keep this around to process errors
1962          */
1963         switch (task->tk_status) {
1964                 case 0:
1965                         if (calldata->roc)
1966                                 pnfs_roc_set_barrier(state->inode,
1967                                                      calldata->roc_barrier);
1968                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1969                         renew_lease(server, calldata->timestamp);
1970                         nfs4_close_clear_stateid_flags(state,
1971                                         calldata->arg.fmode);
1972                         break;
1973                 case -NFS4ERR_STALE_STATEID:
1974                 case -NFS4ERR_OLD_STATEID:
1975                 case -NFS4ERR_BAD_STATEID:
1976                 case -NFS4ERR_EXPIRED:
1977                         if (calldata->arg.fmode == 0)
1978                                 break;
1979                 default:
1980                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1981                                 rpc_restart_call_prepare(task);
1982         }
1983         nfs_release_seqid(calldata->arg.seqid);
1984         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1985 }
1986
1987 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1988 {
1989         struct nfs4_closedata *calldata = data;
1990         struct nfs4_state *state = calldata->state;
1991         int call_close = 0;
1992
1993         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1994                 return;
1995
1996         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1997         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1998         spin_lock(&state->owner->so_lock);
1999         /* Calculate the change in open mode */
2000         if (state->n_rdwr == 0) {
2001                 if (state->n_rdonly == 0) {
2002                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2003                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2004                         calldata->arg.fmode &= ~FMODE_READ;
2005                 }
2006                 if (state->n_wronly == 0) {
2007                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2008                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2009                         calldata->arg.fmode &= ~FMODE_WRITE;
2010                 }
2011         }
2012         spin_unlock(&state->owner->so_lock);
2013
2014         if (!call_close) {
2015                 /* Note: exit _without_ calling nfs4_close_done */
2016                 task->tk_action = NULL;
2017                 return;
2018         }
2019
2020         if (calldata->arg.fmode == 0) {
2021                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2022                 if (calldata->roc &&
2023                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2024                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2025                                      task, NULL);
2026                         return;
2027                 }
2028         }
2029
2030         nfs_fattr_init(calldata->res.fattr);
2031         calldata->timestamp = jiffies;
2032         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2033                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2034                                 1, task))
2035                 return;
2036         rpc_call_start(task);
2037 }
2038
2039 static const struct rpc_call_ops nfs4_close_ops = {
2040         .rpc_call_prepare = nfs4_close_prepare,
2041         .rpc_call_done = nfs4_close_done,
2042         .rpc_release = nfs4_free_closedata,
2043 };
2044
2045 /*
2046  * It is possible for data to be read/written from a mem-mapped file
2047  * after the sys_close call (which hits the vfs layer as a flush).
2048  * This means that we can't safely call nfsv4 close on a file until
2049  * the inode is cleared. This in turn means that we are not good
2050  * NFSv4 citizens - we do not indicate to the server to update the file's
2051  * share state even when we are done with one of the three share
2052  * stateid's in the inode.
2053  *
2054  * NOTE: Caller must be holding the sp->so_owner semaphore!
2055  */
2056 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2057 {
2058         struct nfs_server *server = NFS_SERVER(state->inode);
2059         struct nfs4_closedata *calldata;
2060         struct nfs4_state_owner *sp = state->owner;
2061         struct rpc_task *task;
2062         struct rpc_message msg = {
2063                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2064                 .rpc_cred = state->owner->so_cred,
2065         };
2066         struct rpc_task_setup task_setup_data = {
2067                 .rpc_client = server->client,
2068                 .rpc_message = &msg,
2069                 .callback_ops = &nfs4_close_ops,
2070                 .workqueue = nfsiod_workqueue,
2071                 .flags = RPC_TASK_ASYNC,
2072         };
2073         int status = -ENOMEM;
2074
2075         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2076         if (calldata == NULL)
2077                 goto out;
2078         calldata->inode = state->inode;
2079         calldata->state = state;
2080         calldata->arg.fh = NFS_FH(state->inode);
2081         calldata->arg.stateid = &state->open_stateid;
2082         /* Serialization for the sequence id */
2083         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2084         if (calldata->arg.seqid == NULL)
2085                 goto out_free_calldata;
2086         calldata->arg.fmode = 0;
2087         calldata->arg.bitmask = server->cache_consistency_bitmask;
2088         calldata->res.fattr = &calldata->fattr;
2089         calldata->res.seqid = calldata->arg.seqid;
2090         calldata->res.server = server;
2091         calldata->roc = roc;
2092         nfs_sb_active(calldata->inode->i_sb);
2093
2094         msg.rpc_argp = &calldata->arg;
2095         msg.rpc_resp = &calldata->res;
2096         task_setup_data.callback_data = calldata;
2097         task = rpc_run_task(&task_setup_data);
2098         if (IS_ERR(task))
2099                 return PTR_ERR(task);
2100         status = 0;
2101         if (wait)
2102                 status = rpc_wait_for_completion_task(task);
2103         rpc_put_task(task);
2104         return status;
2105 out_free_calldata:
2106         kfree(calldata);
2107 out:
2108         if (roc)
2109                 pnfs_roc_release(state->inode);
2110         nfs4_put_open_state(state);
2111         nfs4_put_state_owner(sp);
2112         return status;
2113 }
2114
2115 static struct inode *
2116 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2117 {
2118         struct nfs4_state *state;
2119
2120         /* Protect against concurrent sillydeletes */
2121         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2122         if (IS_ERR(state))
2123                 return ERR_CAST(state);
2124         ctx->state = state;
2125         return igrab(state->inode);
2126 }
2127
2128 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2129 {
2130         if (ctx->state == NULL)
2131                 return;
2132         if (is_sync)
2133                 nfs4_close_sync(ctx->state, ctx->mode);
2134         else
2135                 nfs4_close_state(ctx->state, ctx->mode);
2136 }
2137
2138 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2139 {
2140         struct nfs4_server_caps_arg args = {
2141                 .fhandle = fhandle,
2142         };
2143         struct nfs4_server_caps_res res = {};
2144         struct rpc_message msg = {
2145                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2146                 .rpc_argp = &args,
2147                 .rpc_resp = &res,
2148         };
2149         int status;
2150
2151         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2152         if (status == 0) {
2153                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2154                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2155                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2156                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2157                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2158                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2159                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2160                         server->caps |= NFS_CAP_ACLS;
2161                 if (res.has_links != 0)
2162                         server->caps |= NFS_CAP_HARDLINKS;
2163                 if (res.has_symlinks != 0)
2164                         server->caps |= NFS_CAP_SYMLINKS;
2165                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2166                         server->caps |= NFS_CAP_FILEID;
2167                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2168                         server->caps |= NFS_CAP_MODE;
2169                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2170                         server->caps |= NFS_CAP_NLINK;
2171                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2172                         server->caps |= NFS_CAP_OWNER;
2173                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2174                         server->caps |= NFS_CAP_OWNER_GROUP;
2175                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2176                         server->caps |= NFS_CAP_ATIME;
2177                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2178                         server->caps |= NFS_CAP_CTIME;
2179                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2180                         server->caps |= NFS_CAP_MTIME;
2181
2182                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2183                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2184                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2185                 server->acl_bitmask = res.acl_bitmask;
2186         }
2187
2188         return status;
2189 }
2190
2191 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2192 {
2193         struct nfs4_exception exception = { };
2194         int err;
2195         do {
2196                 err = nfs4_handle_exception(server,
2197                                 _nfs4_server_capabilities(server, fhandle),
2198                                 &exception);
2199         } while (exception.retry);
2200         return err;
2201 }
2202
2203 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2204                 struct nfs_fsinfo *info)
2205 {
2206         struct nfs4_lookup_root_arg args = {
2207                 .bitmask = nfs4_fattr_bitmap,
2208         };
2209         struct nfs4_lookup_res res = {
2210                 .server = server,
2211                 .fattr = info->fattr,
2212                 .fh = fhandle,
2213         };
2214         struct rpc_message msg = {
2215                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2216                 .rpc_argp = &args,
2217                 .rpc_resp = &res,
2218         };
2219
2220         nfs_fattr_init(info->fattr);
2221         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2222 }
2223
2224 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2225                 struct nfs_fsinfo *info)
2226 {
2227         struct nfs4_exception exception = { };
2228         int err;
2229         do {
2230                 err = _nfs4_lookup_root(server, fhandle, info);
2231                 switch (err) {
2232                 case 0:
2233                 case -NFS4ERR_WRONGSEC:
2234                         break;
2235                 default:
2236                         err = nfs4_handle_exception(server, err, &exception);
2237                 }
2238         } while (exception.retry);
2239         return err;
2240 }
2241
2242 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2243                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2244 {
2245         struct rpc_auth *auth;
2246         int ret;
2247
2248         auth = rpcauth_create(flavor, server->client);
2249         if (!auth) {
2250                 ret = -EIO;
2251                 goto out;
2252         }
2253         ret = nfs4_lookup_root(server, fhandle, info);
2254 out:
2255         return ret;
2256 }
2257
2258 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2259                               struct nfs_fsinfo *info)
2260 {
2261         int i, len, status = 0;
2262         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2263
2264         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2265         flav_array[len] = RPC_AUTH_NULL;
2266         len += 1;
2267
2268         for (i = 0; i < len; i++) {
2269                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2270                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2271                         continue;
2272                 break;
2273         }
2274         /*
2275          * -EACCESS could mean that the user doesn't have correct permissions
2276          * to access the mount.  It could also mean that we tried to mount
2277          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2278          * existing mount programs don't handle -EACCES very well so it should
2279          * be mapped to -EPERM instead.
2280          */
2281         if (status == -EACCES)
2282                 status = -EPERM;
2283         return status;
2284 }
2285
2286 /*
2287  * get the file handle for the "/" directory on the server
2288  */
2289 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2290                               struct nfs_fsinfo *info)
2291 {
2292         int minor_version = server->nfs_client->cl_minorversion;
2293         int status = nfs4_lookup_root(server, fhandle, info);
2294         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2295                 /*
2296                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2297                  * by nfs4_map_errors() as this function exits.
2298                  */
2299                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2300         if (status == 0)
2301                 status = nfs4_server_capabilities(server, fhandle);
2302         if (status == 0)
2303                 status = nfs4_do_fsinfo(server, fhandle, info);
2304         return nfs4_map_errors(status);
2305 }
2306
2307 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2308 /*
2309  * Get locations and (maybe) other attributes of a referral.
2310  * Note that we'll actually follow the referral later when
2311  * we detect fsid mismatch in inode revalidation
2312  */
2313 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2314                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2315 {
2316         int status = -ENOMEM;
2317         struct page *page = NULL;
2318         struct nfs4_fs_locations *locations = NULL;
2319
2320         page = alloc_page(GFP_KERNEL);
2321         if (page == NULL)
2322                 goto out;
2323         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2324         if (locations == NULL)
2325                 goto out;
2326
2327         status = nfs4_proc_fs_locations(dir, name, locations, page);
2328         if (status != 0)
2329                 goto out;
2330         /* Make sure server returned a different fsid for the referral */
2331         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2332                 dprintk("%s: server did not return a different fsid for"
2333                         " a referral at %s\n", __func__, name->name);
2334                 status = -EIO;
2335                 goto out;
2336         }
2337         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2338         nfs_fixup_referral_attributes(&locations->fattr);
2339
2340         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2341         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2342         memset(fhandle, 0, sizeof(struct nfs_fh));
2343 out:
2344         if (page)
2345                 __free_page(page);
2346         kfree(locations);
2347         return status;
2348 }
2349
2350 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2351 {
2352         struct nfs4_getattr_arg args = {
2353                 .fh = fhandle,
2354                 .bitmask = server->attr_bitmask,
2355         };
2356         struct nfs4_getattr_res res = {
2357                 .fattr = fattr,
2358                 .server = server,
2359         };
2360         struct rpc_message msg = {
2361                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2362                 .rpc_argp = &args,
2363                 .rpc_resp = &res,
2364         };
2365
2366         nfs_fattr_init(fattr);
2367         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2368 }
2369
2370 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2371 {
2372         struct nfs4_exception exception = { };
2373         int err;
2374         do {
2375                 err = nfs4_handle_exception(server,
2376                                 _nfs4_proc_getattr(server, fhandle, fattr),
2377                                 &exception);
2378         } while (exception.retry);
2379         return err;
2380 }
2381
2382 /*
2383  * The file is not closed if it is opened due to the a request to change
2384  * the size of the file. The open call will not be needed once the
2385  * VFS layer lookup-intents are implemented.
2386  *
2387  * Close is called when the inode is destroyed.
2388  * If we haven't opened the file for O_WRONLY, we
2389  * need to in the size_change case to obtain a stateid.
2390  *
2391  * Got race?
2392  * Because OPEN is always done by name in nfsv4, it is
2393  * possible that we opened a different file by the same
2394  * name.  We can recognize this race condition, but we
2395  * can't do anything about it besides returning an error.
2396  *
2397  * This will be fixed with VFS changes (lookup-intent).
2398  */
2399 static int
2400 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2401                   struct iattr *sattr)
2402 {
2403         struct inode *inode = dentry->d_inode;
2404         struct rpc_cred *cred = NULL;
2405         struct nfs4_state *state = NULL;
2406         int status;
2407
2408         if (pnfs_ld_layoutret_on_setattr(inode))
2409                 pnfs_return_layout(inode);
2410
2411         nfs_fattr_init(fattr);
2412
2413         /* Search for an existing open(O_WRITE) file */
2414         if (sattr->ia_valid & ATTR_FILE) {
2415                 struct nfs_open_context *ctx;
2416
2417                 ctx = nfs_file_open_context(sattr->ia_file);
2418                 if (ctx) {
2419                         cred = ctx->cred;
2420                         state = ctx->state;
2421                 }
2422         }
2423
2424         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2425         if (status == 0)
2426                 nfs_setattr_update_inode(inode, sattr);
2427         return status;
2428 }
2429
2430 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2431                 const struct qstr *name, struct nfs_fh *fhandle,
2432                 struct nfs_fattr *fattr)
2433 {
2434         struct nfs_server *server = NFS_SERVER(dir);
2435         int                    status;
2436         struct nfs4_lookup_arg args = {
2437                 .bitmask = server->attr_bitmask,
2438                 .dir_fh = NFS_FH(dir),
2439                 .name = name,
2440         };
2441         struct nfs4_lookup_res res = {
2442                 .server = server,
2443                 .fattr = fattr,
2444                 .fh = fhandle,
2445         };
2446         struct rpc_message msg = {
2447                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2448                 .rpc_argp = &args,
2449                 .rpc_resp = &res,
2450         };
2451
2452         nfs_fattr_init(fattr);
2453
2454         dprintk("NFS call  lookup %s\n", name->name);
2455         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2456         dprintk("NFS reply lookup: %d\n", status);
2457         return status;
2458 }
2459
2460 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2461 {
2462         memset(fh, 0, sizeof(struct nfs_fh));
2463         fattr->fsid.major = 1;
2464         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2465                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2466         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2467         fattr->nlink = 2;
2468 }
2469
2470 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2471                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2472 {
2473         struct nfs4_exception exception = { };
2474         int err;
2475         do {
2476                 int status;
2477
2478                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2479                 switch (status) {
2480                 case -NFS4ERR_BADNAME:
2481                         return -ENOENT;
2482                 case -NFS4ERR_MOVED:
2483                         return nfs4_get_referral(dir, name, fattr, fhandle);
2484                 case -NFS4ERR_WRONGSEC:
2485                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2486                 }
2487                 err = nfs4_handle_exception(NFS_SERVER(dir),
2488                                 status, &exception);
2489         } while (exception.retry);
2490         return err;
2491 }
2492
2493 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2494 {
2495         struct nfs_server *server = NFS_SERVER(inode);
2496         struct nfs4_accessargs args = {
2497                 .fh = NFS_FH(inode),
2498                 .bitmask = server->attr_bitmask,
2499         };
2500         struct nfs4_accessres res = {
2501                 .server = server,
2502         };
2503         struct rpc_message msg = {
2504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2505                 .rpc_argp = &args,
2506                 .rpc_resp = &res,
2507                 .rpc_cred = entry->cred,
2508         };
2509         int mode = entry->mask;
2510         int status;
2511
2512         /*
2513          * Determine which access bits we want to ask for...
2514          */
2515         if (mode & MAY_READ)
2516                 args.access |= NFS4_ACCESS_READ;
2517         if (S_ISDIR(inode->i_mode)) {
2518                 if (mode & MAY_WRITE)
2519                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2520                 if (mode & MAY_EXEC)
2521                         args.access |= NFS4_ACCESS_LOOKUP;
2522         } else {
2523                 if (mode & MAY_WRITE)
2524                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2525                 if (mode & MAY_EXEC)
2526                         args.access |= NFS4_ACCESS_EXECUTE;
2527         }
2528
2529         res.fattr = nfs_alloc_fattr();
2530         if (res.fattr == NULL)
2531                 return -ENOMEM;
2532
2533         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2534         if (!status) {
2535                 entry->mask = 0;
2536                 if (res.access & NFS4_ACCESS_READ)
2537                         entry->mask |= MAY_READ;
2538                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2539                         entry->mask |= MAY_WRITE;
2540                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2541                         entry->mask |= MAY_EXEC;
2542                 nfs_refresh_inode(inode, res.fattr);
2543         }
2544         nfs_free_fattr(res.fattr);
2545         return status;
2546 }
2547
2548 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2549 {
2550         struct nfs4_exception exception = { };
2551         int err;
2552         do {
2553                 err = nfs4_handle_exception(NFS_SERVER(inode),
2554                                 _nfs4_proc_access(inode, entry),
2555                                 &exception);
2556         } while (exception.retry);
2557         return err;
2558 }
2559
2560 /*
2561  * TODO: For the time being, we don't try to get any attributes
2562  * along with any of the zero-copy operations READ, READDIR,
2563  * READLINK, WRITE.
2564  *
2565  * In the case of the first three, we want to put the GETATTR
2566  * after the read-type operation -- this is because it is hard
2567  * to predict the length of a GETATTR response in v4, and thus
2568  * align the READ data correctly.  This means that the GETATTR
2569  * may end up partially falling into the page cache, and we should
2570  * shift it into the 'tail' of the xdr_buf before processing.
2571  * To do this efficiently, we need to know the total length
2572  * of data received, which doesn't seem to be available outside
2573  * of the RPC layer.
2574  *
2575  * In the case of WRITE, we also want to put the GETATTR after
2576  * the operation -- in this case because we want to make sure
2577  * we get the post-operation mtime and size.  This means that
2578  * we can't use xdr_encode_pages() as written: we need a variant
2579  * of it which would leave room in the 'tail' iovec.
2580  *
2581  * Both of these changes to the XDR layer would in fact be quite
2582  * minor, but I decided to leave them for a subsequent patch.
2583  */
2584 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2585                 unsigned int pgbase, unsigned int pglen)
2586 {
2587         struct nfs4_readlink args = {
2588                 .fh       = NFS_FH(inode),
2589                 .pgbase   = pgbase,
2590                 .pglen    = pglen,
2591                 .pages    = &page,
2592         };
2593         struct nfs4_readlink_res res;
2594         struct rpc_message msg = {
2595                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2596                 .rpc_argp = &args,
2597                 .rpc_resp = &res,
2598         };
2599
2600         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2601 }
2602
2603 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2604                 unsigned int pgbase, unsigned int pglen)
2605 {
2606         struct nfs4_exception exception = { };
2607         int err;
2608         do {
2609                 err = nfs4_handle_exception(NFS_SERVER(inode),
2610                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2611                                 &exception);
2612         } while (exception.retry);
2613         return err;
2614 }
2615
2616 /*
2617  * Got race?
2618  * We will need to arrange for the VFS layer to provide an atomic open.
2619  * Until then, this create/open method is prone to inefficiency and race
2620  * conditions due to the lookup, create, and open VFS calls from sys_open()
2621  * placed on the wire.
2622  *
2623  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2624  * The file will be opened again in the subsequent VFS open call
2625  * (nfs4_proc_file_open).
2626  *
2627  * The open for read will just hang around to be used by any process that
2628  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2629  */
2630
2631 static int
2632 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2633                  int flags, struct nfs_open_context *ctx)
2634 {
2635         struct dentry *de = dentry;
2636         struct nfs4_state *state;
2637         struct rpc_cred *cred = NULL;
2638         fmode_t fmode = 0;
2639         int status = 0;
2640
2641         if (ctx != NULL) {
2642                 cred = ctx->cred;
2643                 de = ctx->dentry;
2644                 fmode = ctx->mode;
2645         }
2646         sattr->ia_mode &= ~current_umask();
2647         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2648         d_drop(dentry);
2649         if (IS_ERR(state)) {
2650                 status = PTR_ERR(state);
2651                 goto out;
2652         }
2653         d_add(dentry, igrab(state->inode));
2654         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2655         if (ctx != NULL)
2656                 ctx->state = state;
2657         else
2658                 nfs4_close_sync(state, fmode);
2659 out:
2660         return status;
2661 }
2662
2663 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2664 {
2665         struct nfs_server *server = NFS_SERVER(dir);
2666         struct nfs_removeargs args = {
2667                 .fh = NFS_FH(dir),
2668                 .name.len = name->len,
2669                 .name.name = name->name,
2670                 .bitmask = server->attr_bitmask,
2671         };
2672         struct nfs_removeres res = {
2673                 .server = server,
2674         };
2675         struct rpc_message msg = {
2676                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2677                 .rpc_argp = &args,
2678                 .rpc_resp = &res,
2679         };
2680         int status = -ENOMEM;
2681
2682         res.dir_attr = nfs_alloc_fattr();
2683         if (res.dir_attr == NULL)
2684                 goto out;
2685
2686         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2687         if (status == 0) {
2688                 update_changeattr(dir, &res.cinfo);
2689                 nfs_post_op_update_inode(dir, res.dir_attr);
2690         }
2691         nfs_free_fattr(res.dir_attr);
2692 out:
2693         return status;
2694 }
2695
2696 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2697 {
2698         struct nfs4_exception exception = { };
2699         int err;
2700         do {
2701                 err = nfs4_handle_exception(NFS_SERVER(dir),
2702                                 _nfs4_proc_remove(dir, name),
2703                                 &exception);
2704         } while (exception.retry);
2705         return err;
2706 }
2707
2708 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2709 {
2710         struct nfs_server *server = NFS_SERVER(dir);
2711         struct nfs_removeargs *args = msg->rpc_argp;
2712         struct nfs_removeres *res = msg->rpc_resp;
2713
2714         args->bitmask = server->cache_consistency_bitmask;
2715         res->server = server;
2716         res->seq_res.sr_slot = NULL;
2717         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2718 }
2719
2720 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2721 {
2722         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2723
2724         if (!nfs4_sequence_done(task, &res->seq_res))
2725                 return 0;
2726         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2727                 return 0;
2728         update_changeattr(dir, &res->cinfo);
2729         nfs_post_op_update_inode(dir, res->dir_attr);
2730         return 1;
2731 }
2732
2733 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2734 {
2735         struct nfs_server *server = NFS_SERVER(dir);
2736         struct nfs_renameargs *arg = msg->rpc_argp;
2737         struct nfs_renameres *res = msg->rpc_resp;
2738
2739         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2740         arg->bitmask = server->attr_bitmask;
2741         res->server = server;
2742 }
2743
2744 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2745                                  struct inode *new_dir)
2746 {
2747         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2748
2749         if (!nfs4_sequence_done(task, &res->seq_res))
2750                 return 0;
2751         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2752                 return 0;
2753
2754         update_changeattr(old_dir, &res->old_cinfo);
2755         nfs_post_op_update_inode(old_dir, res->old_fattr);
2756         update_changeattr(new_dir, &res->new_cinfo);
2757         nfs_post_op_update_inode(new_dir, res->new_fattr);
2758         return 1;
2759 }
2760
2761 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2762                 struct inode *new_dir, struct qstr *new_name)
2763 {
2764         struct nfs_server *server = NFS_SERVER(old_dir);
2765         struct nfs_renameargs arg = {
2766                 .old_dir = NFS_FH(old_dir),
2767                 .new_dir = NFS_FH(new_dir),
2768                 .old_name = old_name,
2769                 .new_name = new_name,
2770                 .bitmask = server->attr_bitmask,
2771         };
2772         struct nfs_renameres res = {
2773                 .server = server,
2774         };
2775         struct rpc_message msg = {
2776                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2777                 .rpc_argp = &arg,
2778                 .rpc_resp = &res,
2779         };
2780         int status = -ENOMEM;
2781
2782         res.old_fattr = nfs_alloc_fattr();
2783         res.new_fattr = nfs_alloc_fattr();
2784         if (res.old_fattr == NULL || res.new_fattr == NULL)
2785                 goto out;
2786
2787         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2788         if (!status) {
2789                 update_changeattr(old_dir, &res.old_cinfo);
2790                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2791                 update_changeattr(new_dir, &res.new_cinfo);
2792                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2793         }
2794 out:
2795         nfs_free_fattr(res.new_fattr);
2796         nfs_free_fattr(res.old_fattr);
2797         return status;
2798 }
2799
2800 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2801                 struct inode *new_dir, struct qstr *new_name)
2802 {
2803         struct nfs4_exception exception = { };
2804         int err;
2805         do {
2806                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2807                                 _nfs4_proc_rename(old_dir, old_name,
2808                                         new_dir, new_name),
2809                                 &exception);
2810         } while (exception.retry);
2811         return err;
2812 }
2813
2814 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2815 {
2816         struct nfs_server *server = NFS_SERVER(inode);
2817         struct nfs4_link_arg arg = {
2818                 .fh     = NFS_FH(inode),
2819                 .dir_fh = NFS_FH(dir),
2820                 .name   = name,
2821                 .bitmask = server->attr_bitmask,
2822         };
2823         struct nfs4_link_res res = {
2824                 .server = server,
2825         };
2826         struct rpc_message msg = {
2827                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2828                 .rpc_argp = &arg,
2829                 .rpc_resp = &res,
2830         };
2831         int status = -ENOMEM;
2832
2833         res.fattr = nfs_alloc_fattr();
2834         res.dir_attr = nfs_alloc_fattr();
2835         if (res.fattr == NULL || res.dir_attr == NULL)
2836                 goto out;
2837
2838         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2839         if (!status) {
2840                 update_changeattr(dir, &res.cinfo);
2841                 nfs_post_op_update_inode(dir, res.dir_attr);
2842                 nfs_post_op_update_inode(inode, res.fattr);
2843         }
2844 out:
2845         nfs_free_fattr(res.dir_attr);
2846         nfs_free_fattr(res.fattr);
2847         return status;
2848 }
2849
2850 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2851 {
2852         struct nfs4_exception exception = { };
2853         int err;
2854         do {
2855                 err = nfs4_handle_exception(NFS_SERVER(inode),
2856                                 _nfs4_proc_link(inode, dir, name),
2857                                 &exception);
2858         } while (exception.retry);
2859         return err;
2860 }
2861
2862 struct nfs4_createdata {
2863         struct rpc_message msg;
2864         struct nfs4_create_arg arg;
2865         struct nfs4_create_res res;
2866         struct nfs_fh fh;
2867         struct nfs_fattr fattr;
2868         struct nfs_fattr dir_fattr;
2869 };
2870
2871 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2872                 struct qstr *name, struct iattr *sattr, u32 ftype)
2873 {
2874         struct nfs4_createdata *data;
2875
2876         data = kzalloc(sizeof(*data), GFP_KERNEL);
2877         if (data != NULL) {
2878                 struct nfs_server *server = NFS_SERVER(dir);
2879
2880                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2881                 data->msg.rpc_argp = &data->arg;
2882                 data->msg.rpc_resp = &data->res;
2883                 data->arg.dir_fh = NFS_FH(dir);
2884                 data->arg.server = server;
2885                 data->arg.name = name;
2886                 data->arg.attrs = sattr;
2887                 data->arg.ftype = ftype;
2888                 data->arg.bitmask = server->attr_bitmask;
2889                 data->res.server = server;
2890                 data->res.fh = &data->fh;
2891                 data->res.fattr = &data->fattr;
2892                 data->res.dir_fattr = &data->dir_fattr;
2893                 nfs_fattr_init(data->res.fattr);
2894                 nfs_fattr_init(data->res.dir_fattr);
2895         }
2896         return data;
2897 }
2898
2899 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2900 {
2901         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2902                                     &data->arg.seq_args, &data->res.seq_res, 1);
2903         if (status == 0) {
2904                 update_changeattr(dir, &data->res.dir_cinfo);
2905                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2906                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2907         }
2908         return status;
2909 }
2910
2911 static void nfs4_free_createdata(struct nfs4_createdata *data)
2912 {
2913         kfree(data);
2914 }
2915
2916 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2917                 struct page *page, unsigned int len, struct iattr *sattr)
2918 {
2919         struct nfs4_createdata *data;
2920         int status = -ENAMETOOLONG;
2921
2922         if (len > NFS4_MAXPATHLEN)
2923                 goto out;
2924
2925         status = -ENOMEM;
2926         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2927         if (data == NULL)
2928                 goto out;
2929
2930         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2931         data->arg.u.symlink.pages = &page;
2932         data->arg.u.symlink.len = len;
2933
2934         status = nfs4_do_create(dir, dentry, data);
2935
2936         nfs4_free_createdata(data);
2937 out:
2938         return status;
2939 }
2940
2941 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2942                 struct page *page, unsigned int len, struct iattr *sattr)
2943 {
2944         struct nfs4_exception exception = { };
2945         int err;
2946         do {
2947                 err = nfs4_handle_exception(NFS_SERVER(dir),
2948                                 _nfs4_proc_symlink(dir, dentry, page,
2949                                                         len, sattr),
2950                                 &exception);
2951         } while (exception.retry);
2952         return err;
2953 }
2954
2955 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2956                 struct iattr *sattr)
2957 {
2958         struct nfs4_createdata *data;
2959         int status = -ENOMEM;
2960
2961         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2962         if (data == NULL)
2963                 goto out;
2964
2965         status = nfs4_do_create(dir, dentry, data);
2966
2967         nfs4_free_createdata(data);
2968 out:
2969         return status;
2970 }
2971
2972 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2973                 struct iattr *sattr)
2974 {
2975         struct nfs4_exception exception = { };
2976         int err;
2977
2978         sattr->ia_mode &= ~current_umask();
2979         do {
2980                 err = nfs4_handle_exception(NFS_SERVER(dir),
2981                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2982                                 &exception);
2983         } while (exception.retry);
2984         return err;
2985 }
2986
2987 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2988                 u64 cookie, struct page **pages, unsigned int count, int plus)
2989 {
2990         struct inode            *dir = dentry->d_inode;
2991         struct nfs4_readdir_arg args = {
2992                 .fh = NFS_FH(dir),
2993                 .pages = pages,
2994                 .pgbase = 0,
2995                 .count = count,
2996                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2997                 .plus = plus,
2998         };
2999         struct nfs4_readdir_res res;
3000         struct rpc_message msg = {
3001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3002                 .rpc_argp = &args,
3003                 .rpc_resp = &res,
3004                 .rpc_cred = cred,
3005         };
3006         int                     status;
3007
3008         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3009                         dentry->d_parent->d_name.name,
3010                         dentry->d_name.name,
3011                         (unsigned long long)cookie);
3012         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3013         res.pgbase = args.pgbase;
3014         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3015         if (status >= 0) {
3016                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3017                 status += args.pgbase;
3018         }
3019
3020         nfs_invalidate_atime(dir);
3021
3022         dprintk("%s: returns %d\n", __func__, status);
3023         return status;
3024 }
3025
3026 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3027                 u64 cookie, struct page **pages, unsigned int count, int plus)
3028 {
3029         struct nfs4_exception exception = { };
3030         int err;
3031         do {
3032                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3033                                 _nfs4_proc_readdir(dentry, cred, cookie,
3034                                         pages, count, plus),
3035                                 &exception);
3036         } while (exception.retry);
3037         return err;
3038 }
3039
3040 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3041                 struct iattr *sattr, dev_t rdev)
3042 {
3043         struct nfs4_createdata *data;
3044         int mode = sattr->ia_mode;
3045         int status = -ENOMEM;
3046
3047         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3048         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3049
3050         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3051         if (data == NULL)
3052                 goto out;
3053
3054         if (S_ISFIFO(mode))
3055                 data->arg.ftype = NF4FIFO;
3056         else if (S_ISBLK(mode)) {
3057                 data->arg.ftype = NF4BLK;
3058                 data->arg.u.device.specdata1 = MAJOR(rdev);
3059                 data->arg.u.device.specdata2 = MINOR(rdev);
3060         }
3061         else if (S_ISCHR(mode)) {
3062                 data->arg.ftype = NF4CHR;
3063                 data->arg.u.device.specdata1 = MAJOR(rdev);
3064                 data->arg.u.device.specdata2 = MINOR(rdev);
3065         }
3066
3067         status = nfs4_do_create(dir, dentry, data);
3068
3069         nfs4_free_createdata(data);
3070 out:
3071         return status;
3072 }
3073
3074 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3075                 struct iattr *sattr, dev_t rdev)
3076 {
3077         struct nfs4_exception exception = { };
3078         int err;
3079
3080         sattr->ia_mode &= ~current_umask();
3081         do {
3082                 err = nfs4_handle_exception(NFS_SERVER(dir),
3083                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3084                                 &exception);
3085         } while (exception.retry);
3086         return err;
3087 }
3088
3089 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3090                  struct nfs_fsstat *fsstat)
3091 {
3092         struct nfs4_statfs_arg args = {
3093                 .fh = fhandle,
3094                 .bitmask = server->attr_bitmask,
3095         };
3096         struct nfs4_statfs_res res = {
3097                 .fsstat = fsstat,
3098         };
3099         struct rpc_message msg = {
3100                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3101                 .rpc_argp = &args,
3102                 .rpc_resp = &res,
3103         };
3104
3105         nfs_fattr_init(fsstat->fattr);
3106         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3107 }
3108
3109 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3110 {
3111         struct nfs4_exception exception = { };
3112         int err;
3113         do {
3114                 err = nfs4_handle_exception(server,
3115                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3116                                 &exception);
3117         } while (exception.retry);
3118         return err;
3119 }
3120
3121 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3122                 struct nfs_fsinfo *fsinfo)
3123 {
3124         struct nfs4_fsinfo_arg args = {
3125                 .fh = fhandle,
3126                 .bitmask = server->attr_bitmask,
3127         };
3128         struct nfs4_fsinfo_res res = {
3129                 .fsinfo = fsinfo,
3130         };
3131         struct rpc_message msg = {
3132                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3133                 .rpc_argp = &args,
3134                 .rpc_resp = &res,
3135         };
3136
3137         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3138 }
3139
3140 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3141 {
3142         struct nfs4_exception exception = { };
3143         int err;
3144
3145         do {
3146                 err = nfs4_handle_exception(server,
3147                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3148                                 &exception);
3149         } while (exception.retry);
3150         return err;
3151 }
3152
3153 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3154 {
3155         nfs_fattr_init(fsinfo->fattr);
3156         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3157 }
3158
3159 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3160                 struct nfs_pathconf *pathconf)
3161 {
3162         struct nfs4_pathconf_arg args = {
3163                 .fh = fhandle,
3164                 .bitmask = server->attr_bitmask,
3165         };
3166         struct nfs4_pathconf_res res = {
3167                 .pathconf = pathconf,
3168         };
3169         struct rpc_message msg = {
3170                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3171                 .rpc_argp = &args,
3172                 .rpc_resp = &res,
3173         };
3174
3175         /* None of the pathconf attributes are mandatory to implement */
3176         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3177                 memset(pathconf, 0, sizeof(*pathconf));
3178                 return 0;
3179         }
3180
3181         nfs_fattr_init(pathconf->fattr);
3182         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3183 }
3184
3185 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3186                 struct nfs_pathconf *pathconf)
3187 {
3188         struct nfs4_exception exception = { };
3189         int err;
3190
3191         do {
3192                 err = nfs4_handle_exception(server,
3193                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3194                                 &exception);
3195         } while (exception.retry);
3196         return err;
3197 }
3198
3199 void __nfs4_read_done_cb(struct nfs_read_data *data)
3200 {
3201         nfs_invalidate_atime(data->inode);
3202 }
3203
3204 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3205 {
3206         struct nfs_server *server = NFS_SERVER(data->inode);
3207
3208         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3209                 rpc_restart_call_prepare(task);
3210                 return -EAGAIN;
3211         }
3212
3213         __nfs4_read_done_cb(data);
3214         if (task->tk_status > 0)
3215                 renew_lease(server, data->timestamp);
3216         return 0;
3217 }
3218
3219 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3220 {
3221
3222         dprintk("--> %s\n", __func__);
3223
3224         if (!nfs4_sequence_done(task, &data->res.seq_res))
3225                 return -EAGAIN;
3226
3227         return data->read_done_cb ? data->read_done_cb(task, data) :
3228                                     nfs4_read_done_cb(task, data);
3229 }
3230
3231 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3232 {
3233         data->timestamp   = jiffies;
3234         data->read_done_cb = nfs4_read_done_cb;
3235         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3236 }
3237
3238 /* Reset the the nfs_read_data to send the read to the MDS. */
3239 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3240 {
3241         dprintk("%s Reset task for i/o through\n", __func__);
3242         put_lseg(data->lseg);
3243         data->lseg = NULL;
3244         /* offsets will differ in the dense stripe case */
3245         data->args.offset = data->mds_offset;
3246         data->ds_clp = NULL;
3247         data->args.fh     = NFS_FH(data->inode);
3248         data->read_done_cb = nfs4_read_done_cb;
3249         task->tk_ops = data->mds_ops;
3250         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3251 }
3252 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3253
3254 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3255 {
3256         struct inode *inode = data->inode;
3257
3258         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3259                 rpc_restart_call_prepare(task);
3260                 return -EAGAIN;
3261         }
3262         if (task->tk_status >= 0) {
3263                 renew_lease(NFS_SERVER(inode), data->timestamp);
3264                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3265         }
3266         return 0;
3267 }
3268
3269 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3270 {
3271         if (!nfs4_sequence_done(task, &data->res.seq_res))
3272                 return -EAGAIN;
3273         return data->write_done_cb ? data->write_done_cb(task, data) :
3274                 nfs4_write_done_cb(task, data);
3275 }
3276
3277 /* Reset the the nfs_write_data to send the write to the MDS. */
3278 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3279 {
3280         dprintk("%s Reset task for i/o through\n", __func__);
3281         put_lseg(data->lseg);
3282         data->lseg          = NULL;
3283         data->ds_clp        = NULL;
3284         data->write_done_cb = nfs4_write_done_cb;
3285         data->args.fh       = NFS_FH(data->inode);
3286         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3287         data->args.offset   = data->mds_offset;
3288         data->res.fattr     = &data->fattr;
3289         task->tk_ops        = data->mds_ops;
3290         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3291 }
3292 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3293
3294 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3295 {
3296         struct nfs_server *server = NFS_SERVER(data->inode);
3297
3298         if (data->lseg) {
3299                 data->args.bitmask = NULL;
3300                 data->res.fattr = NULL;
3301         } else
3302                 data->args.bitmask = server->cache_consistency_bitmask;
3303         if (!data->write_done_cb)
3304                 data->write_done_cb = nfs4_write_done_cb;
3305         data->res.server = server;
3306         data->timestamp   = jiffies;
3307
3308         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3309 }
3310
3311 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3312 {
3313         struct inode *inode = data->inode;
3314
3315         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3316                 rpc_restart_call_prepare(task);
3317                 return -EAGAIN;
3318         }
3319         nfs_refresh_inode(inode, data->res.fattr);
3320         return 0;
3321 }
3322
3323 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3324 {
3325         if (!nfs4_sequence_done(task, &data->res.seq_res))
3326                 return -EAGAIN;
3327         return data->write_done_cb(task, data);
3328 }
3329
3330 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3331 {
3332         struct nfs_server *server = NFS_SERVER(data->inode);
3333
3334         if (data->lseg) {
3335                 data->args.bitmask = NULL;
3336                 data->res.fattr = NULL;
3337         } else
3338                 data->args.bitmask = server->cache_consistency_bitmask;
3339         if (!data->write_done_cb)
3340                 data->write_done_cb = nfs4_commit_done_cb;
3341         data->res.server = server;
3342         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3343 }
3344
3345 struct nfs4_renewdata {
3346         struct nfs_client       *client;
3347         unsigned long           timestamp;
3348 };
3349
3350 /*
3351  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3352  * standalone procedure for queueing an asynchronous RENEW.
3353  */
3354 static void nfs4_renew_release(void *calldata)
3355 {
3356         struct nfs4_renewdata *data = calldata;
3357         struct nfs_client *clp = data->client;
3358
3359         if (atomic_read(&clp->cl_count) > 1)
3360                 nfs4_schedule_state_renewal(clp);
3361         nfs_put_client(clp);
3362         kfree(data);
3363 }
3364
3365 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3366 {
3367         struct nfs4_renewdata *data = calldata;
3368         struct nfs_client *clp = data->client;
3369         unsigned long timestamp = data->timestamp;
3370
3371         if (task->tk_status < 0) {
3372                 /* Unless we're shutting down, schedule state recovery! */
3373                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3374                         return;
3375                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3376                         nfs4_schedule_lease_recovery(clp);
3377                         return;
3378                 }
3379                 nfs4_schedule_path_down_recovery(clp);
3380         }
3381         do_renew_lease(clp, timestamp);
3382 }
3383
3384 static const struct rpc_call_ops nfs4_renew_ops = {
3385         .rpc_call_done = nfs4_renew_done,
3386         .rpc_release = nfs4_renew_release,
3387 };
3388
3389 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3390 {
3391         struct rpc_message msg = {
3392                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3393                 .rpc_argp       = clp,
3394                 .rpc_cred       = cred,
3395         };
3396         struct nfs4_renewdata *data;
3397
3398         if (renew_flags == 0)
3399                 return 0;
3400         if (!atomic_inc_not_zero(&clp->cl_count))
3401                 return -EIO;
3402         data = kmalloc(sizeof(*data), GFP_NOFS);
3403         if (data == NULL)
3404                 return -ENOMEM;
3405         data->client = clp;
3406         data->timestamp = jiffies;
3407         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3408                         &nfs4_renew_ops, data);
3409 }
3410
3411 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3412 {
3413         struct rpc_message msg = {
3414                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3415                 .rpc_argp       = clp,
3416                 .rpc_cred       = cred,
3417         };
3418         unsigned long now = jiffies;
3419         int status;
3420
3421         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3422         if (status < 0)
3423                 return status;
3424         do_renew_lease(clp, now);
3425         return 0;
3426 }
3427
3428 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3429 {
3430         return (server->caps & NFS_CAP_ACLS)
3431                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3432                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3433 }
3434
3435 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3436  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3437  * the stack.
3438  */
3439 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3440
3441 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3442                 struct page **pages, unsigned int *pgbase)
3443 {
3444         struct page *newpage, **spages;
3445         int rc = 0;
3446         size_t len;
3447         spages = pages;
3448
3449         do {
3450                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3451                 newpage = alloc_page(GFP_KERNEL);
3452
3453                 if (newpage == NULL)
3454                         goto unwind;
3455                 memcpy(page_address(newpage), buf, len);
3456                 buf += len;
3457                 buflen -= len;
3458                 *pages++ = newpage;
3459                 rc++;
3460         } while (buflen != 0);
3461
3462         return rc;
3463
3464 unwind:
3465         for(; rc > 0; rc--)
3466                 __free_page(spages[rc-1]);
3467         return -ENOMEM;
3468 }
3469
3470 struct nfs4_cached_acl {
3471         int cached;
3472         size_t len;
3473         char data[0];
3474 };
3475
3476 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3477 {
3478         struct nfs_inode *nfsi = NFS_I(inode);
3479
3480         spin_lock(&inode->i_lock);
3481         kfree(nfsi->nfs4_acl);
3482         nfsi->nfs4_acl = acl;
3483         spin_unlock(&inode->i_lock);
3484 }
3485
3486 static void nfs4_zap_acl_attr(struct inode *inode)
3487 {
3488         nfs4_set_cached_acl(inode, NULL);
3489 }
3490
3491 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3492 {
3493         struct nfs_inode *nfsi = NFS_I(inode);
3494         struct nfs4_cached_acl *acl;
3495         int ret = -ENOENT;
3496
3497         spin_lock(&inode->i_lock);
3498         acl = nfsi->nfs4_acl;
3499         if (acl == NULL)
3500                 goto out;
3501         if (buf == NULL) /* user is just asking for length */
3502                 goto out_len;
3503         if (acl->cached == 0)
3504                 goto out;
3505         ret = -ERANGE; /* see getxattr(2) man page */
3506         if (acl->len > buflen)
3507                 goto out;
3508         memcpy(buf, acl->data, acl->len);
3509 out_len:
3510         ret = acl->len;
3511 out:
3512         spin_unlock(&inode->i_lock);
3513         return ret;
3514 }
3515
3516 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3517 {
3518         struct nfs4_cached_acl *acl;
3519
3520         if (buf && acl_len <= PAGE_SIZE) {
3521                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3522                 if (acl == NULL)
3523                         goto out;
3524                 acl->cached = 1;
3525                 memcpy(acl->data, buf, acl_len);
3526         } else {
3527                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3528                 if (acl == NULL)
3529                         goto out;
3530                 acl->cached = 0;
3531         }
3532         acl->len = acl_len;
3533 out:
3534         nfs4_set_cached_acl(inode, acl);
3535 }
3536
3537 /*
3538  * The getxattr API returns the required buffer length when called with a
3539  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3540  * the required buf.  On a NULL buf, we send a page of data to the server
3541  * guessing that the ACL request can be serviced by a page. If so, we cache
3542  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3543  * the cache. If not so, we throw away the page, and cache the required
3544  * length. The next getxattr call will then produce another round trip to
3545  * the server, this time with the input buf of the required size.
3546  */
3547 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3548 {
3549         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
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         int ret = -ENOMEM, npages, i, acl_len = 0;
3565
3566         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3567         /* As long as we're doing a round trip to the server anyway,
3568          * let's be prepared for a page of acl data. */
3569         if (npages == 0)
3570                 npages = 1;
3571
3572         for (i = 0; i < npages; i++) {
3573                 pages[i] = alloc_page(GFP_KERNEL);
3574                 if (!pages[i])
3575                         goto out_free;
3576         }
3577         if (npages > 1) {
3578                 /* for decoding across pages */
3579                 res.acl_scratch = alloc_page(GFP_KERNEL);
3580                 if (!res.acl_scratch)
3581                         goto out_free;
3582         }
3583         args.acl_len = npages * PAGE_SIZE;
3584         args.acl_pgbase = 0;
3585         /* Let decode_getfacl know not to fail if the ACL data is larger than
3586          * the page we send as a guess */
3587         if (buf == NULL)
3588                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3589         resp_buf = page_address(pages[0]);
3590
3591         dprintk("%s  buf %p buflen %ld npages %d args.acl_len %ld\n",
3592                 __func__, buf, buflen, npages, args.acl_len);
3593         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3594                              &msg, &args.seq_args, &res.seq_res, 0);
3595         if (ret)
3596                 goto out_free;
3597
3598         acl_len = res.acl_len - res.acl_data_offset;
3599         if (acl_len > args.acl_len)
3600                 nfs4_write_cached_acl(inode, NULL, acl_len);
3601         else
3602                 nfs4_write_cached_acl(inode, resp_buf + res.acl_data_offset,
3603                                       acl_len);
3604         if (buf) {
3605                 ret = -ERANGE;
3606                 if (acl_len > buflen)
3607                         goto out_free;
3608                 _copy_from_pages(buf, pages, res.acl_data_offset,
3609                                 res.acl_len);
3610         }
3611         ret = acl_len;
3612 out_free:
3613         for (i = 0; i < npages; i++)
3614                 if (pages[i])
3615                         __free_page(pages[i]);
3616         if (res.acl_scratch)
3617                 __free_page(res.acl_scratch);
3618         return ret;
3619 }
3620
3621 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3622 {
3623         struct nfs4_exception exception = { };
3624         ssize_t ret;
3625         do {
3626                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3627                 if (ret >= 0)
3628                         break;
3629                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3630         } while (exception.retry);
3631         return ret;
3632 }
3633
3634 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3635 {
3636         struct nfs_server *server = NFS_SERVER(inode);
3637         int ret;
3638
3639         if (!nfs4_server_supports_acls(server))
3640                 return -EOPNOTSUPP;
3641         ret = nfs_revalidate_inode(server, inode);
3642         if (ret < 0)
3643                 return ret;
3644         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3645                 nfs_zap_acl_cache(inode);
3646         ret = nfs4_read_cached_acl(inode, buf, buflen);
3647         if (ret != -ENOENT)
3648                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3649                  * but no cached acl data, just the acl length */
3650                 return ret;
3651         return nfs4_get_acl_uncached(inode, buf, buflen);
3652 }
3653
3654 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3655 {
3656         struct nfs_server *server = NFS_SERVER(inode);
3657         struct page *pages[NFS4ACL_MAXPAGES];
3658         struct nfs_setaclargs arg = {
3659                 .fh             = NFS_FH(inode),
3660                 .acl_pages      = pages,
3661                 .acl_len        = buflen,
3662         };
3663         struct nfs_setaclres res;
3664         struct rpc_message msg = {
3665                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3666                 .rpc_argp       = &arg,
3667                 .rpc_resp       = &res,
3668         };
3669         int ret, i;
3670
3671         if (!nfs4_server_supports_acls(server))
3672                 return -EOPNOTSUPP;
3673         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3674         if (i < 0)
3675                 return i;
3676         nfs_inode_return_delegation(inode);
3677         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3678
3679         /*
3680          * Free each page after tx, so the only ref left is
3681          * held by the network stack
3682          */
3683         for (; i > 0; i--)
3684                 put_page(pages[i-1]);
3685
3686         /*
3687          * Acl update can result in inode attribute update.
3688          * so mark the attribute cache invalid.
3689          */
3690         spin_lock(&inode->i_lock);
3691         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3692         spin_unlock(&inode->i_lock);
3693         nfs_access_zap_cache(inode);
3694         nfs_zap_acl_cache(inode);
3695         return ret;
3696 }
3697
3698 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3699 {
3700         struct nfs4_exception exception = { };
3701         int err;
3702         do {
3703                 err = nfs4_handle_exception(NFS_SERVER(inode),
3704                                 __nfs4_proc_set_acl(inode, buf, buflen),
3705                                 &exception);
3706         } while (exception.retry);
3707         return err;
3708 }
3709
3710 static int
3711 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3712 {
3713         struct nfs_client *clp = server->nfs_client;
3714
3715         if (task->tk_status >= 0)
3716                 return 0;
3717         switch(task->tk_status) {
3718                 case -NFS4ERR_DELEG_REVOKED:
3719                 case -NFS4ERR_ADMIN_REVOKED:
3720                 case -NFS4ERR_BAD_STATEID:
3721                         if (state != NULL)
3722                                 nfs_remove_bad_delegation(state->inode);
3723                 case -NFS4ERR_OPENMODE:
3724                         if (state == NULL)
3725                                 break;
3726                         nfs4_schedule_stateid_recovery(server, state);
3727                         goto wait_on_recovery;
3728                 case -NFS4ERR_EXPIRED:
3729                         if (state != NULL)
3730                                 nfs4_schedule_stateid_recovery(server, state);
3731                 case -NFS4ERR_STALE_STATEID:
3732                 case -NFS4ERR_STALE_CLIENTID:
3733                         nfs4_schedule_lease_recovery(clp);
3734                         goto wait_on_recovery;
3735 #if defined(CONFIG_NFS_V4_1)
3736                 case -NFS4ERR_BADSESSION:
3737                 case -NFS4ERR_BADSLOT:
3738                 case -NFS4ERR_BAD_HIGH_SLOT:
3739                 case -NFS4ERR_DEADSESSION:
3740                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3741                 case -NFS4ERR_SEQ_FALSE_RETRY:
3742                 case -NFS4ERR_SEQ_MISORDERED:
3743                         dprintk("%s ERROR %d, Reset session\n", __func__,
3744                                 task->tk_status);
3745                         nfs4_schedule_session_recovery(clp->cl_session);
3746                         task->tk_status = 0;
3747                         return -EAGAIN;
3748 #endif /* CONFIG_NFS_V4_1 */
3749                 case -NFS4ERR_DELAY:
3750                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3751                 case -NFS4ERR_GRACE:
3752                 case -EKEYEXPIRED:
3753                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3754                         task->tk_status = 0;
3755                         return -EAGAIN;
3756                 case -NFS4ERR_RETRY_UNCACHED_REP:
3757                 case -NFS4ERR_OLD_STATEID:
3758                         task->tk_status = 0;
3759                         return -EAGAIN;
3760         }
3761         task->tk_status = nfs4_map_errors(task->tk_status);
3762         return 0;
3763 wait_on_recovery:
3764         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3765         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3766                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3767         task->tk_status = 0;
3768         return -EAGAIN;
3769 }
3770
3771 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3772                 unsigned short port, struct rpc_cred *cred,
3773                 struct nfs4_setclientid_res *res)
3774 {
3775         nfs4_verifier sc_verifier;
3776         struct nfs4_setclientid setclientid = {
3777                 .sc_verifier = &sc_verifier,
3778                 .sc_prog = program,
3779                 .sc_cb_ident = clp->cl_cb_ident,
3780         };
3781         struct rpc_message msg = {
3782                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3783                 .rpc_argp = &setclientid,
3784                 .rpc_resp = res,
3785                 .rpc_cred = cred,
3786         };
3787         __be32 *p;
3788         int loop = 0;
3789         int status;
3790
3791         p = (__be32*)sc_verifier.data;
3792         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3793         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3794
3795         for(;;) {
3796                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3797                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3798                                 clp->cl_ipaddr,
3799                                 rpc_peeraddr2str(clp->cl_rpcclient,
3800                                                         RPC_DISPLAY_ADDR),
3801                                 rpc_peeraddr2str(clp->cl_rpcclient,
3802                                                         RPC_DISPLAY_PROTO),
3803                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3804                                 clp->cl_id_uniquifier);
3805                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3806                                 sizeof(setclientid.sc_netid),
3807                                 rpc_peeraddr2str(clp->cl_rpcclient,
3808                                                         RPC_DISPLAY_NETID));
3809                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3810                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3811                                 clp->cl_ipaddr, port >> 8, port & 255);
3812
3813                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3814                 if (status != -NFS4ERR_CLID_INUSE)
3815                         break;
3816                 if (loop != 0) {
3817                         ++clp->cl_id_uniquifier;
3818                         break;
3819                 }
3820                 ++loop;
3821                 ssleep(clp->cl_lease_time / HZ + 1);
3822         }
3823         return status;
3824 }
3825
3826 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3827                 struct nfs4_setclientid_res *arg,
3828                 struct rpc_cred *cred)
3829 {
3830         struct nfs_fsinfo fsinfo;
3831         struct rpc_message msg = {
3832                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3833                 .rpc_argp = arg,
3834                 .rpc_resp = &fsinfo,
3835                 .rpc_cred = cred,
3836         };
3837         unsigned long now;
3838         int status;
3839
3840         now = jiffies;
3841         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3842         if (status == 0) {
3843                 spin_lock(&clp->cl_lock);
3844                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3845                 clp->cl_last_renewal = now;
3846                 spin_unlock(&clp->cl_lock);
3847         }
3848         return status;
3849 }
3850
3851 struct nfs4_delegreturndata {
3852         struct nfs4_delegreturnargs args;
3853         struct nfs4_delegreturnres res;
3854         struct nfs_fh fh;
3855         nfs4_stateid stateid;
3856         unsigned long timestamp;
3857         struct nfs_fattr fattr;
3858         int rpc_status;
3859 };
3860
3861 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3862 {
3863         struct nfs4_delegreturndata *data = calldata;
3864
3865         if (!nfs4_sequence_done(task, &data->res.seq_res))
3866                 return;
3867
3868         switch (task->tk_status) {
3869         case -NFS4ERR_STALE_STATEID:
3870         case -NFS4ERR_EXPIRED:
3871         case 0:
3872                 renew_lease(data->res.server, data->timestamp);
3873                 break;
3874         default:
3875                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3876                                 -EAGAIN) {
3877                         rpc_restart_call_prepare(task);
3878                         return;
3879                 }
3880         }
3881         data->rpc_status = task->tk_status;
3882 }
3883
3884 static void nfs4_delegreturn_release(void *calldata)
3885 {
3886         kfree(calldata);
3887 }
3888
3889 #if defined(CONFIG_NFS_V4_1)
3890 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3891 {
3892         struct nfs4_delegreturndata *d_data;
3893
3894         d_data = (struct nfs4_delegreturndata *)data;
3895
3896         if (nfs4_setup_sequence(d_data->res.server,
3897                                 &d_data->args.seq_args,
3898                                 &d_data->res.seq_res, 1, task))
3899                 return;
3900         rpc_call_start(task);
3901 }
3902 #endif /* CONFIG_NFS_V4_1 */
3903
3904 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3905 #if defined(CONFIG_NFS_V4_1)
3906         .rpc_call_prepare = nfs4_delegreturn_prepare,
3907 #endif /* CONFIG_NFS_V4_1 */
3908         .rpc_call_done = nfs4_delegreturn_done,
3909         .rpc_release = nfs4_delegreturn_release,
3910 };
3911
3912 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3913 {
3914         struct nfs4_delegreturndata *data;
3915         struct nfs_server *server = NFS_SERVER(inode);
3916         struct rpc_task *task;
3917         struct rpc_message msg = {
3918                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3919                 .rpc_cred = cred,
3920         };
3921         struct rpc_task_setup task_setup_data = {
3922                 .rpc_client = server->client,
3923                 .rpc_message = &msg,
3924                 .callback_ops = &nfs4_delegreturn_ops,
3925                 .flags = RPC_TASK_ASYNC,
3926         };
3927         int status = 0;
3928
3929         data = kzalloc(sizeof(*data), GFP_NOFS);
3930         if (data == NULL)
3931                 return -ENOMEM;
3932         data->args.fhandle = &data->fh;
3933         data->args.stateid = &data->stateid;
3934         data->args.bitmask = server->attr_bitmask;
3935         nfs_copy_fh(&data->fh, NFS_FH(inode));
3936         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3937         data->res.fattr = &data->fattr;
3938         data->res.server = server;
3939         nfs_fattr_init(data->res.fattr);
3940         data->timestamp = jiffies;
3941         data->rpc_status = 0;
3942
3943         task_setup_data.callback_data = data;
3944         msg.rpc_argp = &data->args;
3945         msg.rpc_resp = &data->res;
3946         task = rpc_run_task(&task_setup_data);
3947         if (IS_ERR(task))
3948                 return PTR_ERR(task);
3949         if (!issync)
3950                 goto out;
3951         status = nfs4_wait_for_completion_rpc_task(task);
3952         if (status != 0)
3953                 goto out;
3954         status = data->rpc_status;
3955         if (status != 0)
3956                 goto out;
3957         nfs_refresh_inode(inode, &data->fattr);
3958 out:
3959         rpc_put_task(task);
3960         return status;
3961 }
3962
3963 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3964 {
3965         struct nfs_server *server = NFS_SERVER(inode);
3966         struct nfs4_exception exception = { };
3967         int err;
3968         do {
3969                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3970                 switch (err) {
3971                         case -NFS4ERR_STALE_STATEID:
3972                         case -NFS4ERR_EXPIRED:
3973                         case 0:
3974                                 return 0;
3975                 }
3976                 err = nfs4_handle_exception(server, err, &exception);
3977         } while (exception.retry);
3978         return err;
3979 }
3980
3981 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3982 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3983
3984 /*
3985  * sleep, with exponential backoff, and retry the LOCK operation.
3986  */
3987 static unsigned long
3988 nfs4_set_lock_task_retry(unsigned long timeout)
3989 {
3990         schedule_timeout_killable(timeout);
3991         timeout <<= 1;
3992         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3993                 return NFS4_LOCK_MAXTIMEOUT;
3994         return timeout;
3995 }
3996
3997 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3998 {
3999         struct inode *inode = state->inode;
4000         struct nfs_server *server = NFS_SERVER(inode);
4001         struct nfs_client *clp = server->nfs_client;
4002         struct nfs_lockt_args arg = {
4003                 .fh = NFS_FH(inode),
4004                 .fl = request,
4005         };
4006         struct nfs_lockt_res res = {
4007                 .denied = request,
4008         };
4009         struct rpc_message msg = {
4010                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4011                 .rpc_argp       = &arg,
4012                 .rpc_resp       = &res,
4013                 .rpc_cred       = state->owner->so_cred,
4014         };
4015         struct nfs4_lock_state *lsp;
4016         int status;
4017
4018         arg.lock_owner.clientid = clp->cl_clientid;
4019         status = nfs4_set_lock_state(state, request);
4020         if (status != 0)
4021                 goto out;
4022         lsp = request->fl_u.nfs4_fl.owner;
4023         arg.lock_owner.id = lsp->ls_id.id;
4024         arg.lock_owner.s_dev = server->s_dev;
4025         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4026         switch (status) {
4027                 case 0:
4028                         request->fl_type = F_UNLCK;
4029                         break;
4030                 case -NFS4ERR_DENIED:
4031                         status = 0;
4032         }
4033         request->fl_ops->fl_release_private(request);
4034 out:
4035         return status;
4036 }
4037
4038 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4039 {
4040         struct nfs4_exception exception = { };
4041         int err;
4042
4043         do {
4044                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4045                                 _nfs4_proc_getlk(state, cmd, request),
4046                                 &exception);
4047         } while (exception.retry);
4048         return err;
4049 }
4050
4051 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4052 {
4053         int res = 0;
4054         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4055                 case FL_POSIX:
4056                         res = posix_lock_file_wait(file, fl);
4057                         break;
4058                 case FL_FLOCK:
4059                         res = flock_lock_file_wait(file, fl);
4060                         break;
4061                 default:
4062                         BUG();
4063         }
4064         return res;
4065 }
4066
4067 struct nfs4_unlockdata {
4068         struct nfs_locku_args arg;
4069         struct nfs_locku_res res;
4070         struct nfs4_lock_state *lsp;
4071         struct nfs_open_context *ctx;
4072         struct file_lock fl;
4073         const struct nfs_server *server;
4074         unsigned long timestamp;
4075 };
4076
4077 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4078                 struct nfs_open_context *ctx,
4079                 struct nfs4_lock_state *lsp,
4080                 struct nfs_seqid *seqid)
4081 {
4082         struct nfs4_unlockdata *p;
4083         struct inode *inode = lsp->ls_state->inode;
4084
4085         p = kzalloc(sizeof(*p), GFP_NOFS);
4086         if (p == NULL)
4087                 return NULL;
4088         p->arg.fh = NFS_FH(inode);
4089         p->arg.fl = &p->fl;
4090         p->arg.seqid = seqid;
4091         p->res.seqid = seqid;
4092         p->arg.stateid = &lsp->ls_stateid;
4093         p->lsp = lsp;
4094         atomic_inc(&lsp->ls_count);
4095         /* Ensure we don't close file until we're done freeing locks! */
4096         p->ctx = get_nfs_open_context(ctx);
4097         memcpy(&p->fl, fl, sizeof(p->fl));
4098         p->server = NFS_SERVER(inode);
4099         return p;
4100 }
4101
4102 static void nfs4_locku_release_calldata(void *data)
4103 {
4104         struct nfs4_unlockdata *calldata = data;
4105         nfs_free_seqid(calldata->arg.seqid);
4106         nfs4_put_lock_state(calldata->lsp);
4107         put_nfs_open_context(calldata->ctx);
4108         kfree(calldata);
4109 }
4110
4111 static void nfs4_locku_done(struct rpc_task *task, void *data)
4112 {
4113         struct nfs4_unlockdata *calldata = data;
4114
4115         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4116                 return;
4117         switch (task->tk_status) {
4118                 case 0:
4119                         memcpy(calldata->lsp->ls_stateid.data,
4120                                         calldata->res.stateid.data,
4121                                         sizeof(calldata->lsp->ls_stateid.data));
4122                         renew_lease(calldata->server, calldata->timestamp);
4123                         break;
4124                 case -NFS4ERR_BAD_STATEID:
4125                 case -NFS4ERR_OLD_STATEID:
4126                 case -NFS4ERR_STALE_STATEID:
4127                 case -NFS4ERR_EXPIRED:
4128                         break;
4129                 default:
4130                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4131                                 rpc_restart_call_prepare(task);
4132         }
4133 }
4134
4135 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4136 {
4137         struct nfs4_unlockdata *calldata = data;
4138
4139         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4140                 return;
4141         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4142                 /* Note: exit _without_ running nfs4_locku_done */
4143                 task->tk_action = NULL;
4144                 return;
4145         }
4146         calldata->timestamp = jiffies;
4147         if (nfs4_setup_sequence(calldata->server,
4148                                 &calldata->arg.seq_args,
4149                                 &calldata->res.seq_res, 1, task))
4150                 return;
4151         rpc_call_start(task);
4152 }
4153
4154 static const struct rpc_call_ops nfs4_locku_ops = {
4155         .rpc_call_prepare = nfs4_locku_prepare,
4156         .rpc_call_done = nfs4_locku_done,
4157         .rpc_release = nfs4_locku_release_calldata,
4158 };
4159
4160 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4161                 struct nfs_open_context *ctx,
4162                 struct nfs4_lock_state *lsp,
4163                 struct nfs_seqid *seqid)
4164 {
4165         struct nfs4_unlockdata *data;
4166         struct rpc_message msg = {
4167                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4168                 .rpc_cred = ctx->cred,
4169         };
4170         struct rpc_task_setup task_setup_data = {
4171                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4172                 .rpc_message = &msg,
4173                 .callback_ops = &nfs4_locku_ops,
4174                 .workqueue = nfsiod_workqueue,
4175                 .flags = RPC_TASK_ASYNC,
4176         };
4177
4178         /* Ensure this is an unlock - when canceling a lock, the
4179          * canceled lock is passed in, and it won't be an unlock.
4180          */
4181         fl->fl_type = F_UNLCK;
4182
4183         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4184         if (data == NULL) {
4185                 nfs_free_seqid(seqid);
4186                 return ERR_PTR(-ENOMEM);
4187         }
4188
4189         msg.rpc_argp = &data->arg;
4190         msg.rpc_resp = &data->res;
4191         task_setup_data.callback_data = data;
4192         return rpc_run_task(&task_setup_data);
4193 }
4194
4195 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4196 {
4197         struct nfs_inode *nfsi = NFS_I(state->inode);
4198         struct nfs_seqid *seqid;
4199         struct nfs4_lock_state *lsp;
4200         struct rpc_task *task;
4201         int status = 0;
4202         unsigned char fl_flags = request->fl_flags;
4203
4204         status = nfs4_set_lock_state(state, request);
4205         /* Unlock _before_ we do the RPC call */
4206         request->fl_flags |= FL_EXISTS;
4207         down_read(&nfsi->rwsem);
4208         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4209                 up_read(&nfsi->rwsem);
4210                 goto out;
4211         }
4212         up_read(&nfsi->rwsem);
4213         if (status != 0)
4214                 goto out;
4215         /* Is this a delegated lock? */
4216         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4217                 goto out;
4218         lsp = request->fl_u.nfs4_fl.owner;
4219         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4220         status = -ENOMEM;
4221         if (seqid == NULL)
4222                 goto out;
4223         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4224         status = PTR_ERR(task);
4225         if (IS_ERR(task))
4226                 goto out;
4227         status = nfs4_wait_for_completion_rpc_task(task);
4228         rpc_put_task(task);
4229 out:
4230         request->fl_flags = fl_flags;
4231         return status;
4232 }
4233
4234 struct nfs4_lockdata {
4235         struct nfs_lock_args arg;
4236         struct nfs_lock_res res;
4237         struct nfs4_lock_state *lsp;
4238         struct nfs_open_context *ctx;
4239         struct file_lock fl;
4240         unsigned long timestamp;
4241         int rpc_status;
4242         int cancelled;
4243         struct nfs_server *server;
4244 };
4245
4246 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4247                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4248                 gfp_t gfp_mask)
4249 {
4250         struct nfs4_lockdata *p;
4251         struct inode *inode = lsp->ls_state->inode;
4252         struct nfs_server *server = NFS_SERVER(inode);
4253
4254         p = kzalloc(sizeof(*p), gfp_mask);
4255         if (p == NULL)
4256                 return NULL;
4257
4258         p->arg.fh = NFS_FH(inode);
4259         p->arg.fl = &p->fl;
4260         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4261         if (p->arg.open_seqid == NULL)
4262                 goto out_free;
4263         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4264         if (p->arg.lock_seqid == NULL)
4265                 goto out_free_seqid;
4266         p->arg.lock_stateid = &lsp->ls_stateid;
4267         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4268         p->arg.lock_owner.id = lsp->ls_id.id;
4269         p->arg.lock_owner.s_dev = server->s_dev;
4270         p->res.lock_seqid = p->arg.lock_seqid;
4271         p->lsp = lsp;
4272         p->server = server;
4273         atomic_inc(&lsp->ls_count);
4274         p->ctx = get_nfs_open_context(ctx);
4275         memcpy(&p->fl, fl, sizeof(p->fl));
4276         return p;
4277 out_free_seqid:
4278         nfs_free_seqid(p->arg.open_seqid);
4279 out_free:
4280         kfree(p);
4281         return NULL;
4282 }
4283
4284 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4285 {
4286         struct nfs4_lockdata *data = calldata;
4287         struct nfs4_state *state = data->lsp->ls_state;
4288
4289         dprintk("%s: begin!\n", __func__);
4290         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4291                 return;
4292         /* Do we need to do an open_to_lock_owner? */
4293         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4294                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4295                         return;
4296                 data->arg.open_stateid = &state->stateid;
4297                 data->arg.new_lock_owner = 1;
4298                 data->res.open_seqid = data->arg.open_seqid;
4299         } else
4300                 data->arg.new_lock_owner = 0;
4301         data->timestamp = jiffies;
4302         if (nfs4_setup_sequence(data->server,
4303                                 &data->arg.seq_args,
4304                                 &data->res.seq_res, 1, task))
4305                 return;
4306         rpc_call_start(task);
4307         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4308 }
4309
4310 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4311 {
4312         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4313         nfs4_lock_prepare(task, calldata);
4314 }
4315
4316 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4317 {
4318         struct nfs4_lockdata *data = calldata;
4319
4320         dprintk("%s: begin!\n", __func__);
4321
4322         if (!nfs4_sequence_done(task, &data->res.seq_res))
4323                 return;
4324
4325         data->rpc_status = task->tk_status;
4326         if (data->arg.new_lock_owner != 0) {
4327                 if (data->rpc_status == 0)
4328                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4329                 else
4330                         goto out;
4331         }
4332         if (data->rpc_status == 0) {
4333                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4334                                         sizeof(data->lsp->ls_stateid.data));
4335                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4336                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4337         }
4338 out:
4339         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4340 }
4341
4342 static void nfs4_lock_release(void *calldata)
4343 {
4344         struct nfs4_lockdata *data = calldata;
4345
4346         dprintk("%s: begin!\n", __func__);
4347         nfs_free_seqid(data->arg.open_seqid);
4348         if (data->cancelled != 0) {
4349                 struct rpc_task *task;
4350                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4351                                 data->arg.lock_seqid);
4352                 if (!IS_ERR(task))
4353                         rpc_put_task_async(task);
4354                 dprintk("%s: cancelling lock!\n", __func__);
4355         } else
4356                 nfs_free_seqid(data->arg.lock_seqid);
4357         nfs4_put_lock_state(data->lsp);
4358         put_nfs_open_context(data->ctx);
4359         kfree(data);
4360         dprintk("%s: done!\n", __func__);
4361 }
4362
4363 static const struct rpc_call_ops nfs4_lock_ops = {
4364         .rpc_call_prepare = nfs4_lock_prepare,
4365         .rpc_call_done = nfs4_lock_done,
4366         .rpc_release = nfs4_lock_release,
4367 };
4368
4369 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4370         .rpc_call_prepare = nfs4_recover_lock_prepare,
4371         .rpc_call_done = nfs4_lock_done,
4372         .rpc_release = nfs4_lock_release,
4373 };
4374
4375 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4376 {
4377         switch (error) {
4378         case -NFS4ERR_ADMIN_REVOKED:
4379         case -NFS4ERR_BAD_STATEID:
4380                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4381                 if (new_lock_owner != 0 ||
4382                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4383                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4384                 break;
4385         case -NFS4ERR_STALE_STATEID:
4386                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4387         case -NFS4ERR_EXPIRED:
4388                 nfs4_schedule_lease_recovery(server->nfs_client);
4389         };
4390 }
4391
4392 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4393 {
4394         struct nfs4_lockdata *data;
4395         struct rpc_task *task;
4396         struct rpc_message msg = {
4397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4398                 .rpc_cred = state->owner->so_cred,
4399         };
4400         struct rpc_task_setup task_setup_data = {
4401                 .rpc_client = NFS_CLIENT(state->inode),
4402                 .rpc_message = &msg,
4403                 .callback_ops = &nfs4_lock_ops,
4404                 .workqueue = nfsiod_workqueue,
4405                 .flags = RPC_TASK_ASYNC,
4406         };
4407         int ret;
4408
4409         dprintk("%s: begin!\n", __func__);
4410         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4411                         fl->fl_u.nfs4_fl.owner,
4412                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4413         if (data == NULL)
4414                 return -ENOMEM;
4415         if (IS_SETLKW(cmd))
4416                 data->arg.block = 1;
4417         if (recovery_type > NFS_LOCK_NEW) {
4418                 if (recovery_type == NFS_LOCK_RECLAIM)
4419                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4420                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4421         }
4422         msg.rpc_argp = &data->arg;
4423         msg.rpc_resp = &data->res;
4424         task_setup_data.callback_data = data;
4425         task = rpc_run_task(&task_setup_data);
4426         if (IS_ERR(task))
4427                 return PTR_ERR(task);
4428         ret = nfs4_wait_for_completion_rpc_task(task);
4429         if (ret == 0) {
4430                 ret = data->rpc_status;
4431                 if (ret)
4432                         nfs4_handle_setlk_error(data->server, data->lsp,
4433                                         data->arg.new_lock_owner, ret);
4434         } else
4435                 data->cancelled = 1;
4436         rpc_put_task(task);
4437         dprintk("%s: done, ret = %d!\n", __func__, ret);
4438         return ret;
4439 }
4440
4441 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4442 {
4443         struct nfs_server *server = NFS_SERVER(state->inode);
4444         struct nfs4_exception exception = { };
4445         int err;
4446
4447         do {
4448                 /* Cache the lock if possible... */
4449                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4450                         return 0;
4451                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4452                 if (err != -NFS4ERR_DELAY)
4453                         break;
4454                 nfs4_handle_exception(server, err, &exception);
4455         } while (exception.retry);
4456         return err;
4457 }
4458
4459 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4460 {
4461         struct nfs_server *server = NFS_SERVER(state->inode);
4462         struct nfs4_exception exception = { };
4463         int err;
4464
4465         err = nfs4_set_lock_state(state, request);
4466         if (err != 0)
4467                 return err;
4468         do {
4469                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4470                         return 0;
4471                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4472                 switch (err) {
4473                 default:
4474                         goto out;
4475                 case -NFS4ERR_GRACE:
4476                 case -NFS4ERR_DELAY:
4477                         nfs4_handle_exception(server, err, &exception);
4478                         err = 0;
4479                 }
4480         } while (exception.retry);
4481 out:
4482         return err;
4483 }
4484
4485 #if defined(CONFIG_NFS_V4_1)
4486 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4487 {
4488         int status;
4489         struct nfs_server *server = NFS_SERVER(state->inode);
4490
4491         status = nfs41_test_stateid(server, state);
4492         if (status == NFS_OK)
4493                 return 0;
4494         nfs41_free_stateid(server, state);
4495         return nfs4_lock_expired(state, request);
4496 }
4497 #endif
4498
4499 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4500 {
4501         struct nfs_inode *nfsi = NFS_I(state->inode);
4502         unsigned char fl_flags = request->fl_flags;
4503         int status = -ENOLCK;
4504
4505         if ((fl_flags & FL_POSIX) &&
4506                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4507                 goto out;
4508         /* Is this a delegated open? */
4509         status = nfs4_set_lock_state(state, request);
4510         if (status != 0)
4511                 goto out;
4512         request->fl_flags |= FL_ACCESS;
4513         status = do_vfs_lock(request->fl_file, request);
4514         if (status < 0)
4515                 goto out;
4516         down_read(&nfsi->rwsem);
4517         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4518                 /* Yes: cache locks! */
4519                 /* ...but avoid races with delegation recall... */
4520                 request->fl_flags = fl_flags & ~FL_SLEEP;
4521                 status = do_vfs_lock(request->fl_file, request);
4522                 goto out_unlock;
4523         }
4524         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4525         if (status != 0)
4526                 goto out_unlock;
4527         /* Note: we always want to sleep here! */
4528         request->fl_flags = fl_flags | FL_SLEEP;
4529         if (do_vfs_lock(request->fl_file, request) < 0)
4530                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4531 out_unlock:
4532         up_read(&nfsi->rwsem);
4533 out:
4534         request->fl_flags = fl_flags;
4535         return status;
4536 }
4537
4538 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4539 {
4540         struct nfs4_exception exception = {
4541                 .state = state,
4542         };
4543         int err;
4544
4545         do {
4546                 err = _nfs4_proc_setlk(state, cmd, request);
4547                 if (err == -NFS4ERR_DENIED)
4548                         err = -EAGAIN;
4549                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4550                                 err, &exception);
4551         } while (exception.retry);
4552         return err;
4553 }
4554
4555 static int
4556 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4557 {
4558         struct nfs_open_context *ctx;
4559         struct nfs4_state *state;
4560         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4561         int status;
4562
4563         /* verify open state */
4564         ctx = nfs_file_open_context(filp);
4565         state = ctx->state;
4566
4567         if (request->fl_start < 0 || request->fl_end < 0)
4568                 return -EINVAL;
4569
4570         if (IS_GETLK(cmd)) {
4571                 if (state != NULL)
4572                         return nfs4_proc_getlk(state, F_GETLK, request);
4573                 return 0;
4574         }
4575
4576         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4577                 return -EINVAL;
4578
4579         if (request->fl_type == F_UNLCK) {
4580                 if (state != NULL)
4581                         return nfs4_proc_unlck(state, cmd, request);
4582                 return 0;
4583         }
4584
4585         if (state == NULL)
4586                 return -ENOLCK;
4587         do {
4588                 status = nfs4_proc_setlk(state, cmd, request);
4589                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4590                         break;
4591                 timeout = nfs4_set_lock_task_retry(timeout);
4592                 status = -ERESTARTSYS;
4593                 if (signalled())
4594                         break;
4595         } while(status < 0);
4596         return status;
4597 }
4598
4599 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4600 {
4601         struct nfs_server *server = NFS_SERVER(state->inode);
4602         struct nfs4_exception exception = { };
4603         int err;
4604
4605         err = nfs4_set_lock_state(state, fl);
4606         if (err != 0)
4607                 goto out;
4608         do {
4609                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4610                 switch (err) {
4611                         default:
4612                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4613                                                 __func__, err);
4614                         case 0:
4615                         case -ESTALE:
4616                                 goto out;
4617                         case -NFS4ERR_EXPIRED:
4618                                 nfs4_schedule_stateid_recovery(server, state);
4619                         case -NFS4ERR_STALE_CLIENTID:
4620                         case -NFS4ERR_STALE_STATEID:
4621                                 nfs4_schedule_lease_recovery(server->nfs_client);
4622                                 goto out;
4623                         case -NFS4ERR_BADSESSION:
4624                         case -NFS4ERR_BADSLOT:
4625                         case -NFS4ERR_BAD_HIGH_SLOT:
4626                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4627                         case -NFS4ERR_DEADSESSION:
4628                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4629                                 goto out;
4630                         case -ERESTARTSYS:
4631                                 /*
4632                                  * The show must go on: exit, but mark the
4633                                  * stateid as needing recovery.
4634                                  */
4635                         case -NFS4ERR_DELEG_REVOKED:
4636                         case -NFS4ERR_ADMIN_REVOKED:
4637                         case -NFS4ERR_BAD_STATEID:
4638                         case -NFS4ERR_OPENMODE:
4639                                 nfs4_schedule_stateid_recovery(server, state);
4640                                 err = 0;
4641                                 goto out;
4642                         case -EKEYEXPIRED:
4643                                 /*
4644                                  * User RPCSEC_GSS context has expired.
4645                                  * We cannot recover this stateid now, so
4646                                  * skip it and allow recovery thread to
4647                                  * proceed.
4648                                  */
4649                                 err = 0;
4650                                 goto out;
4651                         case -ENOMEM:
4652                         case -NFS4ERR_DENIED:
4653                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4654                                 err = 0;
4655                                 goto out;
4656                         case -NFS4ERR_DELAY:
4657                                 break;
4658                 }
4659                 err = nfs4_handle_exception(server, err, &exception);
4660         } while (exception.retry);
4661 out:
4662         return err;
4663 }
4664
4665 static void nfs4_release_lockowner_release(void *calldata)
4666 {
4667         kfree(calldata);
4668 }
4669
4670 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4671         .rpc_release = nfs4_release_lockowner_release,
4672 };
4673
4674 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4675 {
4676         struct nfs_server *server = lsp->ls_state->owner->so_server;
4677         struct nfs_release_lockowner_args *args;
4678         struct rpc_message msg = {
4679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4680         };
4681
4682         if (server->nfs_client->cl_mvops->minor_version != 0)
4683                 return;
4684         args = kmalloc(sizeof(*args), GFP_NOFS);
4685         if (!args)
4686                 return;
4687         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4688         args->lock_owner.id = lsp->ls_id.id;
4689         args->lock_owner.s_dev = server->s_dev;
4690         msg.rpc_argp = args;
4691         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4692 }
4693
4694 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4695
4696 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4697                                    const void *buf, size_t buflen,
4698                                    int flags, int type)
4699 {
4700         if (strcmp(key, "") != 0)
4701                 return -EINVAL;
4702
4703         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4704 }
4705
4706 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4707                                    void *buf, size_t buflen, int type)
4708 {
4709         if (strcmp(key, "") != 0)
4710                 return -EINVAL;
4711
4712         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4713 }
4714
4715 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4716                                        size_t list_len, const char *name,
4717                                        size_t name_len, int type)
4718 {
4719         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4720
4721         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4722                 return 0;
4723
4724         if (list && len <= list_len)
4725                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4726         return len;
4727 }
4728
4729 /*
4730  * nfs_fhget will use either the mounted_on_fileid or the fileid
4731  */
4732 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4733 {
4734         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4735                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4736               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4737               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4738                 return;
4739
4740         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4741                 NFS_ATTR_FATTR_NLINK;
4742         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4743         fattr->nlink = 2;
4744 }
4745
4746 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4747                 struct nfs4_fs_locations *fs_locations, struct page *page)
4748 {
4749         struct nfs_server *server = NFS_SERVER(dir);
4750         u32 bitmask[2] = {
4751                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4752         };
4753         struct nfs4_fs_locations_arg args = {
4754                 .dir_fh = NFS_FH(dir),
4755                 .name = name,
4756                 .page = page,
4757                 .bitmask = bitmask,
4758         };
4759         struct nfs4_fs_locations_res res = {
4760                 .fs_locations = fs_locations,
4761         };
4762         struct rpc_message msg = {
4763                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4764                 .rpc_argp = &args,
4765                 .rpc_resp = &res,
4766         };
4767         int status;
4768
4769         dprintk("%s: start\n", __func__);
4770
4771         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4772          * is not supported */
4773         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4774                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4775         else
4776                 bitmask[0] |= FATTR4_WORD0_FILEID;
4777
4778         nfs_fattr_init(&fs_locations->fattr);
4779         fs_locations->server = server;
4780         fs_locations->nlocations = 0;
4781         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4782         dprintk("%s: returned status = %d\n", __func__, status);
4783         return status;
4784 }
4785
4786 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4787 {
4788         int status;
4789         struct nfs4_secinfo_arg args = {
4790                 .dir_fh = NFS_FH(dir),
4791                 .name   = name,
4792         };
4793         struct nfs4_secinfo_res res = {
4794                 .flavors     = flavors,
4795         };
4796         struct rpc_message msg = {
4797                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4798                 .rpc_argp = &args,
4799                 .rpc_resp = &res,
4800         };
4801
4802         dprintk("NFS call  secinfo %s\n", name->name);
4803         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4804         dprintk("NFS reply  secinfo: %d\n", status);
4805         return status;
4806 }
4807
4808 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4809 {
4810         struct nfs4_exception exception = { };
4811         int err;
4812         do {
4813                 err = nfs4_handle_exception(NFS_SERVER(dir),
4814                                 _nfs4_proc_secinfo(dir, name, flavors),
4815                                 &exception);
4816         } while (exception.retry);
4817         return err;
4818 }
4819
4820 #ifdef CONFIG_NFS_V4_1
4821 /*
4822  * Check the exchange flags returned by the server for invalid flags, having
4823  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4824  * DS flags set.
4825  */
4826 static int nfs4_check_cl_exchange_flags(u32 flags)
4827 {
4828         if (flags & ~EXCHGID4_FLAG_MASK_R)
4829                 goto out_inval;
4830         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4831             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4832                 goto out_inval;
4833         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4834                 goto out_inval;
4835         return NFS_OK;
4836 out_inval:
4837         return -NFS4ERR_INVAL;
4838 }
4839
4840 static bool
4841 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4842 {
4843         if (a->server_scope_sz == b->server_scope_sz &&
4844             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4845                 return true;
4846
4847         return false;
4848 }
4849
4850 /*
4851  * nfs4_proc_exchange_id()
4852  *
4853  * Since the clientid has expired, all compounds using sessions
4854  * associated with the stale clientid will be returning
4855  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4856  * be in some phase of session reset.
4857  */
4858 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4859 {
4860         nfs4_verifier verifier;
4861         struct nfs41_exchange_id_args args = {
4862                 .client = clp,
4863                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4864         };
4865         struct nfs41_exchange_id_res res = {
4866                 .client = clp,
4867         };
4868         int status;
4869         struct rpc_message msg = {
4870                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4871                 .rpc_argp = &args,
4872                 .rpc_resp = &res,
4873                 .rpc_cred = cred,
4874         };
4875         __be32 *p;
4876
4877         dprintk("--> %s\n", __func__);
4878         BUG_ON(clp == NULL);
4879
4880         p = (u32 *)verifier.data;
4881         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4882         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4883         args.verifier = &verifier;
4884
4885         args.id_len = scnprintf(args.id, sizeof(args.id),
4886                                 "%s/%s.%s/%u",
4887                                 clp->cl_ipaddr,
4888                                 init_utsname()->nodename,
4889                                 init_utsname()->domainname,
4890                                 clp->cl_rpcclient->cl_auth->au_flavor);
4891
4892         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4893         if (unlikely(!res.server_scope)) {
4894                 status = -ENOMEM;
4895                 goto out;
4896         }
4897
4898         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4899         if (!status)
4900                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4901
4902         if (!status) {
4903                 if (clp->server_scope &&
4904                     !nfs41_same_server_scope(clp->server_scope,
4905                                              res.server_scope)) {
4906                         dprintk("%s: server_scope mismatch detected\n",
4907                                 __func__);
4908                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4909                         kfree(clp->server_scope);
4910                         clp->server_scope = NULL;
4911                 }
4912
4913                 if (!clp->server_scope) {
4914                         clp->server_scope = res.server_scope;
4915                         goto out;
4916                 }
4917         }
4918         kfree(res.server_scope);
4919 out:
4920         dprintk("<-- %s status= %d\n", __func__, status);
4921         return status;
4922 }
4923
4924 struct nfs4_get_lease_time_data {
4925         struct nfs4_get_lease_time_args *args;
4926         struct nfs4_get_lease_time_res *res;
4927         struct nfs_client *clp;
4928 };
4929
4930 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4931                                         void *calldata)
4932 {
4933         int ret;
4934         struct nfs4_get_lease_time_data *data =
4935                         (struct nfs4_get_lease_time_data *)calldata;
4936
4937         dprintk("--> %s\n", __func__);
4938         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4939         /* just setup sequence, do not trigger session recovery
4940            since we're invoked within one */
4941         ret = nfs41_setup_sequence(data->clp->cl_session,
4942                                    &data->args->la_seq_args,
4943                                    &data->res->lr_seq_res, 0, task);
4944
4945         BUG_ON(ret == -EAGAIN);
4946         rpc_call_start(task);
4947         dprintk("<-- %s\n", __func__);
4948 }
4949
4950 /*
4951  * Called from nfs4_state_manager thread for session setup, so don't recover
4952  * from sequence operation or clientid errors.
4953  */
4954 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4955 {
4956         struct nfs4_get_lease_time_data *data =
4957                         (struct nfs4_get_lease_time_data *)calldata;
4958
4959         dprintk("--> %s\n", __func__);
4960         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4961                 return;
4962         switch (task->tk_status) {
4963         case -NFS4ERR_DELAY:
4964         case -NFS4ERR_GRACE:
4965                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4966                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4967                 task->tk_status = 0;
4968                 /* fall through */
4969         case -NFS4ERR_RETRY_UNCACHED_REP:
4970                 rpc_restart_call_prepare(task);
4971                 return;
4972         }
4973         dprintk("<-- %s\n", __func__);
4974 }
4975
4976 struct rpc_call_ops nfs4_get_lease_time_ops = {
4977         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4978         .rpc_call_done = nfs4_get_lease_time_done,
4979 };
4980
4981 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4982 {
4983         struct rpc_task *task;
4984         struct nfs4_get_lease_time_args args;
4985         struct nfs4_get_lease_time_res res = {
4986                 .lr_fsinfo = fsinfo,
4987         };
4988         struct nfs4_get_lease_time_data data = {
4989                 .args = &args,
4990                 .res = &res,
4991                 .clp = clp,
4992         };
4993         struct rpc_message msg = {
4994                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4995                 .rpc_argp = &args,
4996                 .rpc_resp = &res,
4997         };
4998         struct rpc_task_setup task_setup = {
4999                 .rpc_client = clp->cl_rpcclient,
5000                 .rpc_message = &msg,
5001                 .callback_ops = &nfs4_get_lease_time_ops,
5002                 .callback_data = &data,
5003                 .flags = RPC_TASK_TIMEOUT,
5004         };
5005         int status;
5006
5007         dprintk("--> %s\n", __func__);
5008         task = rpc_run_task(&task_setup);
5009
5010         if (IS_ERR(task))
5011                 status = PTR_ERR(task);
5012         else {
5013                 status = task->tk_status;
5014                 rpc_put_task(task);
5015         }
5016         dprintk("<-- %s return %d\n", __func__, status);
5017
5018         return status;
5019 }
5020
5021 /*
5022  * Reset a slot table
5023  */
5024 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5025                                  int ivalue)
5026 {
5027         struct nfs4_slot *new = NULL;
5028         int i;
5029         int ret = 0;
5030
5031         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5032                 max_reqs, tbl->max_slots);
5033
5034         /* Does the newly negotiated max_reqs match the existing slot table? */
5035         if (max_reqs != tbl->max_slots) {
5036                 ret = -ENOMEM;
5037                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5038                               GFP_NOFS);
5039                 if (!new)
5040                         goto out;
5041                 ret = 0;
5042                 kfree(tbl->slots);
5043         }
5044         spin_lock(&tbl->slot_tbl_lock);
5045         if (new) {
5046                 tbl->slots = new;
5047                 tbl->max_slots = max_reqs;
5048         }
5049         for (i = 0; i < tbl->max_slots; ++i)
5050                 tbl->slots[i].seq_nr = ivalue;
5051         spin_unlock(&tbl->slot_tbl_lock);
5052         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5053                 tbl, tbl->slots, tbl->max_slots);
5054 out:
5055         dprintk("<-- %s: return %d\n", __func__, ret);
5056         return ret;
5057 }
5058
5059 /*
5060  * Reset the forechannel and backchannel slot tables
5061  */
5062 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5063 {
5064         int status;
5065
5066         status = nfs4_reset_slot_table(&session->fc_slot_table,
5067                         session->fc_attrs.max_reqs, 1);
5068         if (status)
5069                 return status;
5070
5071         status = nfs4_reset_slot_table(&session->bc_slot_table,
5072                         session->bc_attrs.max_reqs, 0);
5073         return status;
5074 }
5075
5076 /* Destroy the slot table */
5077 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5078 {
5079         if (session->fc_slot_table.slots != NULL) {
5080                 kfree(session->fc_slot_table.slots);
5081                 session->fc_slot_table.slots = NULL;
5082         }
5083         if (session->bc_slot_table.slots != NULL) {
5084                 kfree(session->bc_slot_table.slots);
5085                 session->bc_slot_table.slots = NULL;
5086         }
5087         return;
5088 }
5089
5090 /*
5091  * Initialize slot table
5092  */
5093 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5094                 int max_slots, int ivalue)
5095 {
5096         struct nfs4_slot *slot;
5097         int ret = -ENOMEM;
5098
5099         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5100
5101         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5102
5103         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5104         if (!slot)
5105                 goto out;
5106         ret = 0;
5107
5108         spin_lock(&tbl->slot_tbl_lock);
5109         tbl->max_slots = max_slots;
5110         tbl->slots = slot;
5111         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5112         spin_unlock(&tbl->slot_tbl_lock);
5113         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5114                 tbl, tbl->slots, tbl->max_slots);
5115 out:
5116         dprintk("<-- %s: return %d\n", __func__, ret);
5117         return ret;
5118 }
5119
5120 /*
5121  * Initialize the forechannel and backchannel tables
5122  */
5123 static int nfs4_init_slot_tables(struct nfs4_session *session)
5124 {
5125         struct nfs4_slot_table *tbl;
5126         int status = 0;
5127
5128         tbl = &session->fc_slot_table;
5129         if (tbl->slots == NULL) {
5130                 status = nfs4_init_slot_table(tbl,
5131                                 session->fc_attrs.max_reqs, 1);
5132                 if (status)
5133                         return status;
5134         }
5135
5136         tbl = &session->bc_slot_table;
5137         if (tbl->slots == NULL) {
5138                 status = nfs4_init_slot_table(tbl,
5139                                 session->bc_attrs.max_reqs, 0);
5140                 if (status)
5141                         nfs4_destroy_slot_tables(session);
5142         }
5143
5144         return status;
5145 }
5146
5147 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5148 {
5149         struct nfs4_session *session;
5150         struct nfs4_slot_table *tbl;
5151
5152         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5153         if (!session)
5154                 return NULL;
5155
5156         tbl = &session->fc_slot_table;
5157         tbl->highest_used_slotid = -1;
5158         spin_lock_init(&tbl->slot_tbl_lock);
5159         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5160         init_completion(&tbl->complete);
5161
5162         tbl = &session->bc_slot_table;
5163         tbl->highest_used_slotid = -1;
5164         spin_lock_init(&tbl->slot_tbl_lock);
5165         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5166         init_completion(&tbl->complete);
5167
5168         session->session_state = 1<<NFS4_SESSION_INITING;
5169
5170         session->clp = clp;
5171         return session;
5172 }
5173
5174 void nfs4_destroy_session(struct nfs4_session *session)
5175 {
5176         nfs4_proc_destroy_session(session);
5177         dprintk("%s Destroy backchannel for xprt %p\n",
5178                 __func__, session->clp->cl_rpcclient->cl_xprt);
5179         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5180                                 NFS41_BC_MIN_CALLBACKS);
5181         nfs4_destroy_slot_tables(session);
5182         kfree(session);
5183 }
5184
5185 /*
5186  * Initialize the values to be used by the client in CREATE_SESSION
5187  * If nfs4_init_session set the fore channel request and response sizes,
5188  * use them.
5189  *
5190  * Set the back channel max_resp_sz_cached to zero to force the client to
5191  * always set csa_cachethis to FALSE because the current implementation
5192  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5193  */
5194 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5195 {
5196         struct nfs4_session *session = args->client->cl_session;
5197         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5198                      mxresp_sz = session->fc_attrs.max_resp_sz;
5199
5200         if (mxrqst_sz == 0)
5201                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5202         if (mxresp_sz == 0)
5203                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5204         /* Fore channel attributes */
5205         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5206         args->fc_attrs.max_resp_sz = mxresp_sz;
5207         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5208         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5209
5210         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5211                 "max_ops=%u max_reqs=%u\n",
5212                 __func__,
5213                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5214                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5215
5216         /* Back channel attributes */
5217         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5218         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5219         args->bc_attrs.max_resp_sz_cached = 0;
5220         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5221         args->bc_attrs.max_reqs = 1;
5222
5223         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5224                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5225                 __func__,
5226                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5227                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5228                 args->bc_attrs.max_reqs);
5229 }
5230
5231 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5232 {
5233         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5234         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5235
5236         if (rcvd->max_resp_sz > sent->max_resp_sz)
5237                 return -EINVAL;
5238         /*
5239          * Our requested max_ops is the minimum we need; we're not
5240          * prepared to break up compounds into smaller pieces than that.
5241          * So, no point even trying to continue if the server won't
5242          * cooperate:
5243          */
5244         if (rcvd->max_ops < sent->max_ops)
5245                 return -EINVAL;
5246         if (rcvd->max_reqs == 0)
5247                 return -EINVAL;
5248         return 0;
5249 }
5250
5251 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5252 {
5253         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5254         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5255
5256         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5257                 return -EINVAL;
5258         if (rcvd->max_resp_sz < sent->max_resp_sz)
5259                 return -EINVAL;
5260         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5261                 return -EINVAL;
5262         /* These would render the backchannel useless: */
5263         if (rcvd->max_ops  == 0)
5264                 return -EINVAL;
5265         if (rcvd->max_reqs == 0)
5266                 return -EINVAL;
5267         return 0;
5268 }
5269
5270 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5271                                      struct nfs4_session *session)
5272 {
5273         int ret;
5274
5275         ret = nfs4_verify_fore_channel_attrs(args, session);
5276         if (ret)
5277                 return ret;
5278         return nfs4_verify_back_channel_attrs(args, session);
5279 }
5280
5281 static int _nfs4_proc_create_session(struct nfs_client *clp)
5282 {
5283         struct nfs4_session *session = clp->cl_session;
5284         struct nfs41_create_session_args args = {
5285                 .client = clp,
5286                 .cb_program = NFS4_CALLBACK,
5287         };
5288         struct nfs41_create_session_res res = {
5289                 .client = clp,
5290         };
5291         struct rpc_message msg = {
5292                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5293                 .rpc_argp = &args,
5294                 .rpc_resp = &res,
5295         };
5296         int status;
5297
5298         nfs4_init_channel_attrs(&args);
5299         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5300
5301         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5302
5303         if (!status)
5304                 /* Verify the session's negotiated channel_attrs values */
5305                 status = nfs4_verify_channel_attrs(&args, session);
5306         if (!status) {
5307                 /* Increment the clientid slot sequence id */
5308                 clp->cl_seqid++;
5309         }
5310
5311         return status;
5312 }
5313
5314 /*
5315  * Issues a CREATE_SESSION operation to the server.
5316  * It is the responsibility of the caller to verify the session is
5317  * expired before calling this routine.
5318  */
5319 int nfs4_proc_create_session(struct nfs_client *clp)
5320 {
5321         int status;
5322         unsigned *ptr;
5323         struct nfs4_session *session = clp->cl_session;
5324
5325         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5326
5327         status = _nfs4_proc_create_session(clp);
5328         if (status)
5329                 goto out;
5330
5331         /* Init and reset the fore channel */
5332         status = nfs4_init_slot_tables(session);
5333         dprintk("slot table initialization returned %d\n", status);
5334         if (status)
5335                 goto out;
5336         status = nfs4_reset_slot_tables(session);
5337         dprintk("slot table reset returned %d\n", status);
5338         if (status)
5339                 goto out;
5340
5341         ptr = (unsigned *)&session->sess_id.data[0];
5342         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5343                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5344 out:
5345         dprintk("<-- %s\n", __func__);
5346         return status;
5347 }
5348
5349 /*
5350  * Issue the over-the-wire RPC DESTROY_SESSION.
5351  * The caller must serialize access to this routine.
5352  */
5353 int nfs4_proc_destroy_session(struct nfs4_session *session)
5354 {
5355         int status = 0;
5356         struct rpc_message msg;
5357
5358         dprintk("--> nfs4_proc_destroy_session\n");
5359
5360         /* session is still being setup */
5361         if (session->clp->cl_cons_state != NFS_CS_READY)
5362                 return status;
5363
5364         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5365         msg.rpc_argp = session;
5366         msg.rpc_resp = NULL;
5367         msg.rpc_cred = NULL;
5368         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5369
5370         if (status)
5371                 printk(KERN_WARNING
5372                         "Got error %d from the server on DESTROY_SESSION. "
5373                         "Session has been destroyed regardless...\n", status);
5374
5375         dprintk("<-- nfs4_proc_destroy_session\n");
5376         return status;
5377 }
5378
5379 int nfs4_init_session(struct nfs_server *server)
5380 {
5381         struct nfs_client *clp = server->nfs_client;
5382         struct nfs4_session *session;
5383         unsigned int rsize, wsize;
5384         int ret;
5385
5386         if (!nfs4_has_session(clp))
5387                 return 0;
5388
5389         session = clp->cl_session;
5390         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5391                 return 0;
5392
5393         rsize = server->rsize;
5394         if (rsize == 0)
5395                 rsize = NFS_MAX_FILE_IO_SIZE;
5396         wsize = server->wsize;
5397         if (wsize == 0)
5398                 wsize = NFS_MAX_FILE_IO_SIZE;
5399
5400         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5401         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5402
5403         ret = nfs4_recover_expired_lease(server);
5404         if (!ret)
5405                 ret = nfs4_check_client_ready(clp);
5406         return ret;
5407 }
5408
5409 int nfs4_init_ds_session(struct nfs_client *clp)
5410 {
5411         struct nfs4_session *session = clp->cl_session;
5412         int ret;
5413
5414         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5415                 return 0;
5416
5417         ret = nfs4_client_recover_expired_lease(clp);
5418         if (!ret)
5419                 /* Test for the DS role */
5420                 if (!is_ds_client(clp))
5421                         ret = -ENODEV;
5422         if (!ret)
5423                 ret = nfs4_check_client_ready(clp);
5424         return ret;
5425
5426 }
5427 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5428
5429
5430 /*
5431  * Renew the cl_session lease.
5432  */
5433 struct nfs4_sequence_data {
5434         struct nfs_client *clp;
5435         struct nfs4_sequence_args args;
5436         struct nfs4_sequence_res res;
5437 };
5438
5439 static void nfs41_sequence_release(void *data)
5440 {
5441         struct nfs4_sequence_data *calldata = data;
5442         struct nfs_client *clp = calldata->clp;
5443
5444         if (atomic_read(&clp->cl_count) > 1)
5445                 nfs4_schedule_state_renewal(clp);
5446         nfs_put_client(clp);
5447         kfree(calldata);
5448 }
5449
5450 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5451 {
5452         switch(task->tk_status) {
5453         case -NFS4ERR_DELAY:
5454                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5455                 return -EAGAIN;
5456         default:
5457                 nfs4_schedule_lease_recovery(clp);
5458         }
5459         return 0;
5460 }
5461
5462 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5463 {
5464         struct nfs4_sequence_data *calldata = data;
5465         struct nfs_client *clp = calldata->clp;
5466
5467         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5468                 return;
5469
5470         if (task->tk_status < 0) {
5471                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5472                 if (atomic_read(&clp->cl_count) == 1)
5473                         goto out;
5474
5475                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5476                         rpc_restart_call_prepare(task);
5477                         return;
5478                 }
5479         }
5480         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5481 out:
5482         dprintk("<-- %s\n", __func__);
5483 }
5484
5485 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5486 {
5487         struct nfs4_sequence_data *calldata = data;
5488         struct nfs_client *clp = calldata->clp;
5489         struct nfs4_sequence_args *args;
5490         struct nfs4_sequence_res *res;
5491
5492         args = task->tk_msg.rpc_argp;
5493         res = task->tk_msg.rpc_resp;
5494
5495         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5496                 return;
5497         rpc_call_start(task);
5498 }
5499
5500 static const struct rpc_call_ops nfs41_sequence_ops = {
5501         .rpc_call_done = nfs41_sequence_call_done,
5502         .rpc_call_prepare = nfs41_sequence_prepare,
5503         .rpc_release = nfs41_sequence_release,
5504 };
5505
5506 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5507 {
5508         struct nfs4_sequence_data *calldata;
5509         struct rpc_message msg = {
5510                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5511                 .rpc_cred = cred,
5512         };
5513         struct rpc_task_setup task_setup_data = {
5514                 .rpc_client = clp->cl_rpcclient,
5515                 .rpc_message = &msg,
5516                 .callback_ops = &nfs41_sequence_ops,
5517                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5518         };
5519
5520         if (!atomic_inc_not_zero(&clp->cl_count))
5521                 return ERR_PTR(-EIO);
5522         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5523         if (calldata == NULL) {
5524                 nfs_put_client(clp);
5525                 return ERR_PTR(-ENOMEM);
5526         }
5527         msg.rpc_argp = &calldata->args;
5528         msg.rpc_resp = &calldata->res;
5529         calldata->clp = clp;
5530         task_setup_data.callback_data = calldata;
5531
5532         return rpc_run_task(&task_setup_data);
5533 }
5534
5535 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5536 {
5537         struct rpc_task *task;
5538         int ret = 0;
5539
5540         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5541                 return 0;
5542         task = _nfs41_proc_sequence(clp, cred);
5543         if (IS_ERR(task))
5544                 ret = PTR_ERR(task);
5545         else
5546                 rpc_put_task_async(task);
5547         dprintk("<-- %s status=%d\n", __func__, ret);
5548         return ret;
5549 }
5550
5551 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5552 {
5553         struct rpc_task *task;
5554         int ret;
5555
5556         task = _nfs41_proc_sequence(clp, cred);
5557         if (IS_ERR(task)) {
5558                 ret = PTR_ERR(task);
5559                 goto out;
5560         }
5561         ret = rpc_wait_for_completion_task(task);
5562         if (!ret) {
5563                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5564
5565                 if (task->tk_status == 0)
5566                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5567                 ret = task->tk_status;
5568         }
5569         rpc_put_task(task);
5570 out:
5571         dprintk("<-- %s status=%d\n", __func__, ret);
5572         return ret;
5573 }
5574
5575 struct nfs4_reclaim_complete_data {
5576         struct nfs_client *clp;
5577         struct nfs41_reclaim_complete_args arg;
5578         struct nfs41_reclaim_complete_res res;
5579 };
5580
5581 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5582 {
5583         struct nfs4_reclaim_complete_data *calldata = data;
5584
5585         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5586         if (nfs41_setup_sequence(calldata->clp->cl_session,
5587                                 &calldata->arg.seq_args,
5588                                 &calldata->res.seq_res, 0, task))
5589                 return;
5590
5591         rpc_call_start(task);
5592 }
5593
5594 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5595 {
5596         switch(task->tk_status) {
5597         case 0:
5598         case -NFS4ERR_COMPLETE_ALREADY:
5599         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5600                 break;
5601         case -NFS4ERR_DELAY:
5602                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5603                 /* fall through */
5604         case -NFS4ERR_RETRY_UNCACHED_REP:
5605                 return -EAGAIN;
5606         default:
5607                 nfs4_schedule_lease_recovery(clp);
5608         }
5609         return 0;
5610 }
5611
5612 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5613 {
5614         struct nfs4_reclaim_complete_data *calldata = data;
5615         struct nfs_client *clp = calldata->clp;
5616         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5617
5618         dprintk("--> %s\n", __func__);
5619         if (!nfs41_sequence_done(task, res))
5620                 return;
5621
5622         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5623                 rpc_restart_call_prepare(task);
5624                 return;
5625         }
5626         dprintk("<-- %s\n", __func__);
5627 }
5628
5629 static void nfs4_free_reclaim_complete_data(void *data)
5630 {
5631         struct nfs4_reclaim_complete_data *calldata = data;
5632
5633         kfree(calldata);
5634 }
5635
5636 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5637         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5638         .rpc_call_done = nfs4_reclaim_complete_done,
5639         .rpc_release = nfs4_free_reclaim_complete_data,
5640 };
5641
5642 /*
5643  * Issue a global reclaim complete.
5644  */
5645 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5646 {
5647         struct nfs4_reclaim_complete_data *calldata;
5648         struct rpc_task *task;
5649         struct rpc_message msg = {
5650                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5651         };
5652         struct rpc_task_setup task_setup_data = {
5653                 .rpc_client = clp->cl_rpcclient,
5654                 .rpc_message = &msg,
5655                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5656                 .flags = RPC_TASK_ASYNC,
5657         };
5658         int status = -ENOMEM;
5659
5660         dprintk("--> %s\n", __func__);
5661         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5662         if (calldata == NULL)
5663                 goto out;
5664         calldata->clp = clp;
5665         calldata->arg.one_fs = 0;
5666
5667         msg.rpc_argp = &calldata->arg;
5668         msg.rpc_resp = &calldata->res;
5669         task_setup_data.callback_data = calldata;
5670         task = rpc_run_task(&task_setup_data);
5671         if (IS_ERR(task)) {
5672                 status = PTR_ERR(task);
5673                 goto out;
5674         }
5675         status = nfs4_wait_for_completion_rpc_task(task);
5676         if (status == 0)
5677                 status = task->tk_status;
5678         rpc_put_task(task);
5679         return 0;
5680 out:
5681         dprintk("<-- %s status=%d\n", __func__, status);
5682         return status;
5683 }
5684
5685 static void
5686 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5687 {
5688         struct nfs4_layoutget *lgp = calldata;
5689         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5690
5691         dprintk("--> %s\n", __func__);
5692         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5693          * right now covering the LAYOUTGET we are about to send.
5694          * However, that is not so catastrophic, and there seems
5695          * to be no way to prevent it completely.
5696          */
5697         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5698                                 &lgp->res.seq_res, 0, task))
5699                 return;
5700         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5701                                           NFS_I(lgp->args.inode)->layout,
5702                                           lgp->args.ctx->state)) {
5703                 rpc_exit(task, NFS4_OK);
5704                 return;
5705         }
5706         rpc_call_start(task);
5707 }
5708
5709 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5710 {
5711         struct nfs4_layoutget *lgp = calldata;
5712         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5713
5714         dprintk("--> %s\n", __func__);
5715
5716         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5717                 return;
5718
5719         switch (task->tk_status) {
5720         case 0:
5721                 break;
5722         case -NFS4ERR_LAYOUTTRYLATER:
5723         case -NFS4ERR_RECALLCONFLICT:
5724                 task->tk_status = -NFS4ERR_DELAY;
5725                 /* Fall through */
5726         default:
5727                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5728                         rpc_restart_call_prepare(task);
5729                         return;
5730                 }
5731         }
5732         dprintk("<-- %s\n", __func__);
5733 }
5734
5735 static void nfs4_layoutget_release(void *calldata)
5736 {
5737         struct nfs4_layoutget *lgp = calldata;
5738
5739         dprintk("--> %s\n", __func__);
5740         put_nfs_open_context(lgp->args.ctx);
5741         kfree(calldata);
5742         dprintk("<-- %s\n", __func__);
5743 }
5744
5745 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5746         .rpc_call_prepare = nfs4_layoutget_prepare,
5747         .rpc_call_done = nfs4_layoutget_done,
5748         .rpc_release = nfs4_layoutget_release,
5749 };
5750
5751 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5752 {
5753         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5754         struct rpc_task *task;
5755         struct rpc_message msg = {
5756                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5757                 .rpc_argp = &lgp->args,
5758                 .rpc_resp = &lgp->res,
5759         };
5760         struct rpc_task_setup task_setup_data = {
5761                 .rpc_client = server->client,
5762                 .rpc_message = &msg,
5763                 .callback_ops = &nfs4_layoutget_call_ops,
5764                 .callback_data = lgp,
5765                 .flags = RPC_TASK_ASYNC,
5766         };
5767         int status = 0;
5768
5769         dprintk("--> %s\n", __func__);
5770
5771         lgp->res.layoutp = &lgp->args.layout;
5772         lgp->res.seq_res.sr_slot = NULL;
5773         task = rpc_run_task(&task_setup_data);
5774         if (IS_ERR(task))
5775                 return PTR_ERR(task);
5776         status = nfs4_wait_for_completion_rpc_task(task);
5777         if (status == 0)
5778                 status = task->tk_status;
5779         if (status == 0)
5780                 status = pnfs_layout_process(lgp);
5781         rpc_put_task(task);
5782         dprintk("<-- %s status=%d\n", __func__, status);
5783         return status;
5784 }
5785
5786 static void
5787 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5788 {
5789         struct nfs4_layoutreturn *lrp = calldata;
5790
5791         dprintk("--> %s\n", __func__);
5792         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5793                                 &lrp->res.seq_res, 0, task))
5794                 return;
5795         rpc_call_start(task);
5796 }
5797
5798 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5799 {
5800         struct nfs4_layoutreturn *lrp = calldata;
5801         struct nfs_server *server;
5802         struct pnfs_layout_hdr *lo = lrp->args.layout;
5803
5804         dprintk("--> %s\n", __func__);
5805
5806         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5807                 return;
5808
5809         server = NFS_SERVER(lrp->args.inode);
5810         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5811                 rpc_restart_call_prepare(task);
5812                 return;
5813         }
5814         spin_lock(&lo->plh_inode->i_lock);
5815         if (task->tk_status == 0) {
5816                 if (lrp->res.lrs_present) {
5817                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5818                 } else
5819                         BUG_ON(!list_empty(&lo->plh_segs));
5820         }
5821         lo->plh_block_lgets--;
5822         spin_unlock(&lo->plh_inode->i_lock);
5823         dprintk("<-- %s\n", __func__);
5824 }
5825
5826 static void nfs4_layoutreturn_release(void *calldata)
5827 {
5828         struct nfs4_layoutreturn *lrp = calldata;
5829
5830         dprintk("--> %s\n", __func__);
5831         put_layout_hdr(lrp->args.layout);
5832         kfree(calldata);
5833         dprintk("<-- %s\n", __func__);
5834 }
5835
5836 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5837         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5838         .rpc_call_done = nfs4_layoutreturn_done,
5839         .rpc_release = nfs4_layoutreturn_release,
5840 };
5841
5842 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5843 {
5844         struct rpc_task *task;
5845         struct rpc_message msg = {
5846                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5847                 .rpc_argp = &lrp->args,
5848                 .rpc_resp = &lrp->res,
5849         };
5850         struct rpc_task_setup task_setup_data = {
5851                 .rpc_client = lrp->clp->cl_rpcclient,
5852                 .rpc_message = &msg,
5853                 .callback_ops = &nfs4_layoutreturn_call_ops,
5854                 .callback_data = lrp,
5855         };
5856         int status;
5857
5858         dprintk("--> %s\n", __func__);
5859         task = rpc_run_task(&task_setup_data);
5860         if (IS_ERR(task))
5861                 return PTR_ERR(task);
5862         status = task->tk_status;
5863         dprintk("<-- %s status=%d\n", __func__, status);
5864         rpc_put_task(task);
5865         return status;
5866 }
5867
5868 /*
5869  * Retrieve the list of Data Server devices from the MDS.
5870  */
5871 static int _nfs4_getdevicelist(struct nfs_server *server,
5872                                     const struct nfs_fh *fh,
5873                                     struct pnfs_devicelist *devlist)
5874 {
5875         struct nfs4_getdevicelist_args args = {
5876                 .fh = fh,
5877                 .layoutclass = server->pnfs_curr_ld->id,
5878         };
5879         struct nfs4_getdevicelist_res res = {
5880                 .devlist = devlist,
5881         };
5882         struct rpc_message msg = {
5883                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5884                 .rpc_argp = &args,
5885                 .rpc_resp = &res,
5886         };
5887         int status;
5888
5889         dprintk("--> %s\n", __func__);
5890         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5891                                 &res.seq_res, 0);
5892         dprintk("<-- %s status=%d\n", __func__, status);
5893         return status;
5894 }
5895
5896 int nfs4_proc_getdevicelist(struct nfs_server *server,
5897                             const struct nfs_fh *fh,
5898                             struct pnfs_devicelist *devlist)
5899 {
5900         struct nfs4_exception exception = { };
5901         int err;
5902
5903         do {
5904                 err = nfs4_handle_exception(server,
5905                                 _nfs4_getdevicelist(server, fh, devlist),
5906                                 &exception);
5907         } while (exception.retry);
5908
5909         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5910                 err, devlist->num_devs);
5911
5912         return err;
5913 }
5914 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5915
5916 static int
5917 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5918 {
5919         struct nfs4_getdeviceinfo_args args = {
5920                 .pdev = pdev,
5921         };
5922         struct nfs4_getdeviceinfo_res res = {
5923                 .pdev = pdev,
5924         };
5925         struct rpc_message msg = {
5926                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5927                 .rpc_argp = &args,
5928                 .rpc_resp = &res,
5929         };
5930         int status;
5931
5932         dprintk("--> %s\n", __func__);
5933         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5934         dprintk("<-- %s status=%d\n", __func__, status);
5935
5936         return status;
5937 }
5938
5939 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5940 {
5941         struct nfs4_exception exception = { };
5942         int err;
5943
5944         do {
5945                 err = nfs4_handle_exception(server,
5946                                         _nfs4_proc_getdeviceinfo(server, pdev),
5947                                         &exception);
5948         } while (exception.retry);
5949         return err;
5950 }
5951 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5952
5953 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5954 {
5955         struct nfs4_layoutcommit_data *data = calldata;
5956         struct nfs_server *server = NFS_SERVER(data->args.inode);
5957
5958         if (nfs4_setup_sequence(server, &data->args.seq_args,
5959                                 &data->res.seq_res, 1, task))
5960                 return;
5961         rpc_call_start(task);
5962 }
5963
5964 static void
5965 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5966 {
5967         struct nfs4_layoutcommit_data *data = calldata;
5968         struct nfs_server *server = NFS_SERVER(data->args.inode);
5969
5970         if (!nfs4_sequence_done(task, &data->res.seq_res))
5971                 return;
5972
5973         switch (task->tk_status) { /* Just ignore these failures */
5974         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5975         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5976         case NFS4ERR_BADLAYOUT:     /* no layout */
5977         case NFS4ERR_GRACE:         /* loca_recalim always false */
5978                 task->tk_status = 0;
5979         }
5980
5981         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5982                 rpc_restart_call_prepare(task);
5983                 return;
5984         }
5985
5986         if (task->tk_status == 0)
5987                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5988                                                    data->res.fattr);
5989 }
5990
5991 static void nfs4_layoutcommit_release(void *calldata)
5992 {
5993         struct nfs4_layoutcommit_data *data = calldata;
5994         struct pnfs_layout_segment *lseg, *tmp;
5995         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
5996
5997         pnfs_cleanup_layoutcommit(data);
5998         /* Matched by references in pnfs_set_layoutcommit */
5999         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6000                 list_del_init(&lseg->pls_lc_list);
6001                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6002                                        &lseg->pls_flags))
6003                         put_lseg(lseg);
6004         }
6005
6006         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6007         smp_mb__after_clear_bit();
6008         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6009
6010         put_rpccred(data->cred);
6011         kfree(data);
6012 }
6013
6014 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6015         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6016         .rpc_call_done = nfs4_layoutcommit_done,
6017         .rpc_release = nfs4_layoutcommit_release,
6018 };
6019
6020 int
6021 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6022 {
6023         struct rpc_message msg = {
6024                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6025                 .rpc_argp = &data->args,
6026                 .rpc_resp = &data->res,
6027                 .rpc_cred = data->cred,
6028         };
6029         struct rpc_task_setup task_setup_data = {
6030                 .task = &data->task,
6031                 .rpc_client = NFS_CLIENT(data->args.inode),
6032                 .rpc_message = &msg,
6033                 .callback_ops = &nfs4_layoutcommit_ops,
6034                 .callback_data = data,
6035                 .flags = RPC_TASK_ASYNC,
6036         };
6037         struct rpc_task *task;
6038         int status = 0;
6039
6040         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6041                 "lbw: %llu inode %lu\n",
6042                 data->task.tk_pid, sync,
6043                 data->args.lastbytewritten,
6044                 data->args.inode->i_ino);
6045
6046         task = rpc_run_task(&task_setup_data);
6047         if (IS_ERR(task))
6048                 return PTR_ERR(task);
6049         if (sync == false)
6050                 goto out;
6051         status = nfs4_wait_for_completion_rpc_task(task);
6052         if (status != 0)
6053                 goto out;
6054         status = task->tk_status;
6055 out:
6056         dprintk("%s: status %d\n", __func__, status);
6057         rpc_put_task(task);
6058         return status;
6059 }
6060
6061 static int
6062 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6063                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6064 {
6065         struct nfs41_secinfo_no_name_args args = {
6066                 .style = SECINFO_STYLE_CURRENT_FH,
6067         };
6068         struct nfs4_secinfo_res res = {
6069                 .flavors = flavors,
6070         };
6071         struct rpc_message msg = {
6072                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6073                 .rpc_argp = &args,
6074                 .rpc_resp = &res,
6075         };
6076         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6077 }
6078
6079 static int
6080 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6081                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6082 {
6083         struct nfs4_exception exception = { };
6084         int err;
6085         do {
6086                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6087                 switch (err) {
6088                 case 0:
6089                 case -NFS4ERR_WRONGSEC:
6090                 case -NFS4ERR_NOTSUPP:
6091                         break;
6092                 default:
6093                         err = nfs4_handle_exception(server, err, &exception);
6094                 }
6095         } while (exception.retry);
6096         return err;
6097 }
6098
6099 static int
6100 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6101                     struct nfs_fsinfo *info)
6102 {
6103         int err;
6104         struct page *page;
6105         rpc_authflavor_t flavor;
6106         struct nfs4_secinfo_flavors *flavors;
6107
6108         page = alloc_page(GFP_KERNEL);
6109         if (!page) {
6110                 err = -ENOMEM;
6111                 goto out;
6112         }
6113
6114         flavors = page_address(page);
6115         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6116
6117         /*
6118          * Fall back on "guess and check" method if
6119          * the server doesn't support SECINFO_NO_NAME
6120          */
6121         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6122                 err = nfs4_find_root_sec(server, fhandle, info);
6123                 goto out_freepage;
6124         }
6125         if (err)
6126                 goto out_freepage;
6127
6128         flavor = nfs_find_best_sec(flavors);
6129         if (err == 0)
6130                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6131
6132 out_freepage:
6133         put_page(page);
6134         if (err == -EACCES)
6135                 return -EPERM;
6136 out:
6137         return err;
6138 }
6139 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6140 {
6141         int status;
6142         struct nfs41_test_stateid_args args = {
6143                 .stateid = &state->stateid,
6144         };
6145         struct nfs41_test_stateid_res res;
6146         struct rpc_message msg = {
6147                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6148                 .rpc_argp = &args,
6149                 .rpc_resp = &res,
6150         };
6151         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6152         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6153         return status;
6154 }
6155
6156 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6157 {
6158         struct nfs4_exception exception = { };
6159         int err;
6160         do {
6161                 err = nfs4_handle_exception(server,
6162                                 _nfs41_test_stateid(server, state),
6163                                 &exception);
6164         } while (exception.retry);
6165         return err;
6166 }
6167
6168 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6169 {
6170         int status;
6171         struct nfs41_free_stateid_args args = {
6172                 .stateid = &state->stateid,
6173         };
6174         struct nfs41_free_stateid_res res;
6175         struct rpc_message msg = {
6176                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6177                 .rpc_argp = &args,
6178                 .rpc_resp = &res,
6179         };
6180
6181         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6182         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6183         return status;
6184 }
6185
6186 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6187 {
6188         struct nfs4_exception exception = { };
6189         int err;
6190         do {
6191                 err = nfs4_handle_exception(server,
6192                                 _nfs4_free_stateid(server, state),
6193                                 &exception);
6194         } while (exception.retry);
6195         return err;
6196 }
6197 #endif /* CONFIG_NFS_V4_1 */
6198
6199 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6200         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6201         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6202         .recover_open   = nfs4_open_reclaim,
6203         .recover_lock   = nfs4_lock_reclaim,
6204         .establish_clid = nfs4_init_clientid,
6205         .get_clid_cred  = nfs4_get_setclientid_cred,
6206 };
6207
6208 #if defined(CONFIG_NFS_V4_1)
6209 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6210         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6211         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6212         .recover_open   = nfs4_open_reclaim,
6213         .recover_lock   = nfs4_lock_reclaim,
6214         .establish_clid = nfs41_init_clientid,
6215         .get_clid_cred  = nfs4_get_exchange_id_cred,
6216         .reclaim_complete = nfs41_proc_reclaim_complete,
6217 };
6218 #endif /* CONFIG_NFS_V4_1 */
6219
6220 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6221         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6222         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6223         .recover_open   = nfs4_open_expired,
6224         .recover_lock   = nfs4_lock_expired,
6225         .establish_clid = nfs4_init_clientid,
6226         .get_clid_cred  = nfs4_get_setclientid_cred,
6227 };
6228
6229 #if defined(CONFIG_NFS_V4_1)
6230 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6231         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6232         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6233         .recover_open   = nfs41_open_expired,
6234         .recover_lock   = nfs41_lock_expired,
6235         .establish_clid = nfs41_init_clientid,
6236         .get_clid_cred  = nfs4_get_exchange_id_cred,
6237 };
6238 #endif /* CONFIG_NFS_V4_1 */
6239
6240 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6241         .sched_state_renewal = nfs4_proc_async_renew,
6242         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6243         .renew_lease = nfs4_proc_renew,
6244 };
6245
6246 #if defined(CONFIG_NFS_V4_1)
6247 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6248         .sched_state_renewal = nfs41_proc_async_sequence,
6249         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6250         .renew_lease = nfs4_proc_sequence,
6251 };
6252 #endif
6253
6254 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6255         .minor_version = 0,
6256         .call_sync = _nfs4_call_sync,
6257         .validate_stateid = nfs4_validate_delegation_stateid,
6258         .find_root_sec = nfs4_find_root_sec,
6259         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6260         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6261         .state_renewal_ops = &nfs40_state_renewal_ops,
6262 };
6263
6264 #if defined(CONFIG_NFS_V4_1)
6265 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6266         .minor_version = 1,
6267         .call_sync = _nfs4_call_sync_session,
6268         .validate_stateid = nfs41_validate_delegation_stateid,
6269         .find_root_sec = nfs41_find_root_sec,
6270         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6271         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6272         .state_renewal_ops = &nfs41_state_renewal_ops,
6273 };
6274 #endif
6275
6276 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6277         [0] = &nfs_v4_0_minor_ops,
6278 #if defined(CONFIG_NFS_V4_1)
6279         [1] = &nfs_v4_1_minor_ops,
6280 #endif
6281 };
6282
6283 static const struct inode_operations nfs4_file_inode_operations = {
6284         .permission     = nfs_permission,
6285         .getattr        = nfs_getattr,
6286         .setattr        = nfs_setattr,
6287         .getxattr       = generic_getxattr,
6288         .setxattr       = generic_setxattr,
6289         .listxattr      = generic_listxattr,
6290         .removexattr    = generic_removexattr,
6291 };
6292
6293 const struct nfs_rpc_ops nfs_v4_clientops = {
6294         .version        = 4,                    /* protocol version */
6295         .dentry_ops     = &nfs4_dentry_operations,
6296         .dir_inode_ops  = &nfs4_dir_inode_operations,
6297         .file_inode_ops = &nfs4_file_inode_operations,
6298         .file_ops       = &nfs4_file_operations,
6299         .getroot        = nfs4_proc_get_root,
6300         .getattr        = nfs4_proc_getattr,
6301         .setattr        = nfs4_proc_setattr,
6302         .lookup         = nfs4_proc_lookup,
6303         .access         = nfs4_proc_access,
6304         .readlink       = nfs4_proc_readlink,
6305         .create         = nfs4_proc_create,
6306         .remove         = nfs4_proc_remove,
6307         .unlink_setup   = nfs4_proc_unlink_setup,
6308         .unlink_done    = nfs4_proc_unlink_done,
6309         .rename         = nfs4_proc_rename,
6310         .rename_setup   = nfs4_proc_rename_setup,
6311         .rename_done    = nfs4_proc_rename_done,
6312         .link           = nfs4_proc_link,
6313         .symlink        = nfs4_proc_symlink,
6314         .mkdir          = nfs4_proc_mkdir,
6315         .rmdir          = nfs4_proc_remove,
6316         .readdir        = nfs4_proc_readdir,
6317         .mknod          = nfs4_proc_mknod,
6318         .statfs         = nfs4_proc_statfs,
6319         .fsinfo         = nfs4_proc_fsinfo,
6320         .pathconf       = nfs4_proc_pathconf,
6321         .set_capabilities = nfs4_server_capabilities,
6322         .decode_dirent  = nfs4_decode_dirent,
6323         .read_setup     = nfs4_proc_read_setup,
6324         .read_done      = nfs4_read_done,
6325         .write_setup    = nfs4_proc_write_setup,
6326         .write_done     = nfs4_write_done,
6327         .commit_setup   = nfs4_proc_commit_setup,
6328         .commit_done    = nfs4_commit_done,
6329         .lock           = nfs4_proc_lock,
6330         .clear_acl_cache = nfs4_zap_acl_attr,
6331         .close_context  = nfs4_close_context,
6332         .open_context   = nfs4_atomic_open,
6333         .init_client    = nfs4_init_client,
6334         .secinfo        = nfs4_proc_secinfo,
6335 };
6336
6337 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6338         .prefix = XATTR_NAME_NFSV4_ACL,
6339         .list   = nfs4_xattr_list_nfs4_acl,
6340         .get    = nfs4_xattr_get_nfs4_acl,
6341         .set    = nfs4_xattr_set_nfs4_acl,
6342 };
6343
6344 const struct xattr_handler *nfs4_xattr_handlers[] = {
6345         &nfs4_xattr_nfs4_acl_handler,
6346         NULL
6347 };
6348
6349 /*
6350  * Local variables:
6351  *  c-basic-offset: 8
6352  * End:
6353  */