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/nfs_idmap.h>
  56 #include <linux/sunrpc/bc_xprt.h>
  57 #include <linux/xattr.h>
  58 #include <linux/utsname.h>
  59 #include <linux/freezer.h>
  60
  61 #include "nfs4_fs.h"
  62 #include "delegation.h"
  63 #include "internal.h"
  64 #include "iostat.h"
  65 #include "callback.h"
  66 #include "pnfs.h"
  67
  68 #define NFSDBG_FACILITY         NFSDBG_PROC
  69
  70 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  71 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  72
  73 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  74
  75 struct nfs4_opendata;
  76 static int _nfs4_proc_open(struct nfs4_opendata *data);
  77 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  78 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  79 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  80 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  81 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  82                             struct nfs_fattr *fattr, struct iattr *sattr,
  83                             struct nfs4_state *state);
  84 #ifdef CONFIG_NFS_V4_1
  85 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  86 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  87 #endif
  88 /* Prevent leaks of NFSv4 errors into userland */
  89 static int nfs4_map_errors(int err)
  90 {
  91         if (err >= -1000)
  92                 return err;
  93         switch (err) {
  94         case -NFS4ERR_RESOURCE:
  95                 return -EREMOTEIO;
  96         case -NFS4ERR_WRONGSEC:
  97                 return -EPERM;
  98         case -NFS4ERR_BADOWNER:
  99         case -NFS4ERR_BADNAME:
 100                 return -EINVAL;
 101         default:
 102                 dprintk("%s could not handle NFSv4 error %d\n",
 103                                 __func__, -err);
 104                 break;
 105         }
 106         return -EIO;
 107 }
 108
 109 /*
 110  * This is our standard bitmap for GETATTR requests.
 111  */
 112 const u32 nfs4_fattr_bitmap[2] = {
 113         FATTR4_WORD0_TYPE
 114         | FATTR4_WORD0_CHANGE
 115         | FATTR4_WORD0_SIZE
 116         | FATTR4_WORD0_FSID
 117         | FATTR4_WORD0_FILEID,
 118         FATTR4_WORD1_MODE
 119         | FATTR4_WORD1_NUMLINKS
 120         | FATTR4_WORD1_OWNER
 121         | FATTR4_WORD1_OWNER_GROUP
 122         | FATTR4_WORD1_RAWDEV
 123         | FATTR4_WORD1_SPACE_USED
 124         | FATTR4_WORD1_TIME_ACCESS
 125         | FATTR4_WORD1_TIME_METADATA
 126         | FATTR4_WORD1_TIME_MODIFY
 127 };
 128
 129 const u32 nfs4_statfs_bitmap[2] = {
 130         FATTR4_WORD0_FILES_AVAIL
 131         | FATTR4_WORD0_FILES_FREE
 132         | FATTR4_WORD0_FILES_TOTAL,
 133         FATTR4_WORD1_SPACE_AVAIL
 134         | FATTR4_WORD1_SPACE_FREE
 135         | FATTR4_WORD1_SPACE_TOTAL
 136 };
 137
 138 const u32 nfs4_pathconf_bitmap[2] = {
 139         FATTR4_WORD0_MAXLINK
 140         | FATTR4_WORD0_MAXNAME,
 141         0
 142 };
 143
 144 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 145                         | FATTR4_WORD0_MAXREAD
 146                         | FATTR4_WORD0_MAXWRITE
 147                         | FATTR4_WORD0_LEASE_TIME,
 148                         FATTR4_WORD1_TIME_DELTA
 149                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 150                         FATTR4_WORD2_LAYOUT_BLKSIZE
 151 };
 152
 153 const u32 nfs4_fs_locations_bitmap[2] = {
 154         FATTR4_WORD0_TYPE
 155         | FATTR4_WORD0_CHANGE
 156         | FATTR4_WORD0_SIZE
 157         | FATTR4_WORD0_FSID
 158         | FATTR4_WORD0_FILEID
 159         | FATTR4_WORD0_FS_LOCATIONS,
 160         FATTR4_WORD1_MODE
 161         | FATTR4_WORD1_NUMLINKS
 162         | FATTR4_WORD1_OWNER
 163         | FATTR4_WORD1_OWNER_GROUP
 164         | FATTR4_WORD1_RAWDEV
 165         | FATTR4_WORD1_SPACE_USED
 166         | FATTR4_WORD1_TIME_ACCESS
 167         | FATTR4_WORD1_TIME_METADATA
 168         | FATTR4_WORD1_TIME_MODIFY
 169         | FATTR4_WORD1_MOUNTED_ON_FILEID
 170 };
 171
 172 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 173                 struct nfs4_readdir_arg *readdir)
 174 {
 175         __be32 *start, *p;
 176
 177         BUG_ON(readdir->count < 80);
 178         if (cookie > 2) {
 179                 readdir->cookie = cookie;
 180                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 181                 return;
 182         }
 183
 184         readdir->cookie = 0;
 185         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 186         if (cookie == 2)
 187                 return;
 188
 189         /*
 190          * NFSv4 servers do not return entries for '.' and '..'
 191          * Therefore, we fake these entries here.  We let '.'
 192          * have cookie 0 and '..' have cookie 1.  Note that
 193          * when talking to the server, we always send cookie 0
 194          * instead of 1 or 2.
 195          */
 196         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 197
 198         if (cookie == 0) {
 199                 *p++ = xdr_one;                                  /* next */
 200                 *p++ = xdr_zero;                   /* cookie, first word */
 201                 *p++ = xdr_one;                   /* cookie, second word */
 202                 *p++ = xdr_one;                             /* entry len */
 203                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 204                 p++;
 205                 *p++ = xdr_one;                         /* bitmap length */
 206                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 207                 *p++ = htonl(8);              /* attribute buffer length */
 208                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 209         }
 210
 211         *p++ = xdr_one;                                  /* next */
 212         *p++ = xdr_zero;                   /* cookie, first word */
 213         *p++ = xdr_two;                   /* cookie, second word */
 214         *p++ = xdr_two;                             /* entry len */
 215         memcpy(p, "..\0\0", 4);                         /* entry */
 216         p++;
 217         *p++ = xdr_one;                         /* bitmap length */
 218         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 219         *p++ = htonl(8);              /* attribute buffer length */
 220         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 221
 222         readdir->pgbase = (char *)p - (char *)start;
 223         readdir->count -= readdir->pgbase;
 224         kunmap_atomic(start, KM_USER0);
 225 }
 226
 227 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 228 {
 229         int res;
 230
 231         might_sleep();
 232
 233         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 234                         nfs_wait_bit_killable, TASK_KILLABLE);
 235         return res;
 236 }
 237
 238 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 239 {
 240         int res = 0;
 241
 242         might_sleep();
 243
 244         if (*timeout <= 0)
 245                 *timeout = NFS4_POLL_RETRY_MIN;
 246         if (*timeout > NFS4_POLL_RETRY_MAX)
 247                 *timeout = NFS4_POLL_RETRY_MAX;
 248         freezable_schedule_timeout_killable(*timeout);
 249         if (fatal_signal_pending(current))
 250                 res = -ERESTARTSYS;
 251         *timeout <<= 1;
 252         return res;
 253 }
 254
 255 /* This is the error handling routine for processes that are allowed
 256  * to sleep.
 257  */
 258 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 259 {
 260         struct nfs_client *clp = server->nfs_client;
 261         struct nfs4_state *state = exception->state;
 262         int ret = errorcode;
 263
 264         exception->retry = 0;
 265         switch(errorcode) {
 266                 case 0:
 267                         return 0;
 268                 case -NFS4ERR_ADMIN_REVOKED:
 269                 case -NFS4ERR_BAD_STATEID:
 270                 case -NFS4ERR_OPENMODE:
 271                         if (state == NULL)
 272                                 break;
 273                         nfs4_schedule_stateid_recovery(server, state);
 274                         goto wait_on_recovery;
 275                 case -NFS4ERR_EXPIRED:
 276                         if (state != NULL)
 277                                 nfs4_schedule_stateid_recovery(server, state);
 278                 case -NFS4ERR_STALE_STATEID:
 279                 case -NFS4ERR_STALE_CLIENTID:
 280                         nfs4_schedule_lease_recovery(clp);
 281                         goto wait_on_recovery;
 282 #if defined(CONFIG_NFS_V4_1)
 283                 case -NFS4ERR_BADSESSION:
 284                 case -NFS4ERR_BADSLOT:
 285                 case -NFS4ERR_BAD_HIGH_SLOT:
 286                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 287                 case -NFS4ERR_DEADSESSION:
 288                 case -NFS4ERR_SEQ_FALSE_RETRY:
 289                 case -NFS4ERR_SEQ_MISORDERED:
 290                         dprintk("%s ERROR: %d Reset session\n", __func__,
 291                                 errorcode);
 292                         nfs4_schedule_session_recovery(clp->cl_session);
 293                         exception->retry = 1;
 294                         break;
 295 #endif /* defined(CONFIG_NFS_V4_1) */
 296                 case -NFS4ERR_FILE_OPEN:
 297                         if (exception->timeout > HZ) {
 298                                 /* We have retried a decent amount, time to
 299                                  * fail
 300                                  */
 301                                 ret = -EBUSY;
 302                                 break;
 303                         }
 304                 case -NFS4ERR_GRACE:
 305                 case -NFS4ERR_DELAY:
 306                 case -EKEYEXPIRED:
 307                         ret = nfs4_delay(server->client, &exception->timeout);
 308                         if (ret != 0)
 309                                 break;
 310                 case -NFS4ERR_RETRY_UNCACHED_REP:
 311                 case -NFS4ERR_OLD_STATEID:
 312                         exception->retry = 1;
 313                         break;
 314                 case -NFS4ERR_BADOWNER:
 315                         /* The following works around a Linux server bug! */
 316                 case -NFS4ERR_BADNAME:
 317                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 318                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 319                                 exception->retry = 1;
 320                                 printk(KERN_WARNING "NFS: v4 server %s "
 321                                                 "does not accept raw "
 322                                                 "uid/gids. "
 323                                                 "Reenabling the idmapper.\n",
 324                                                 server->nfs_client->cl_hostname);
 325                         }
 326         }
 327         /* We failed to handle the error */
 328         return nfs4_map_errors(ret);
 329 wait_on_recovery:
 330         ret = nfs4_wait_clnt_recover(clp);
 331         if (ret == 0)
 332                 exception->retry = 1;
 333         return ret;
 334 }
 335
 336
 337 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 338 {
 339         spin_lock(&clp->cl_lock);
 340         if (time_before(clp->cl_last_renewal,timestamp))
 341                 clp->cl_last_renewal = timestamp;
 342         spin_unlock(&clp->cl_lock);
 343 }
 344
 345 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 346 {
 347         do_renew_lease(server->nfs_client, timestamp);
 348 }
 349
 350 #if defined(CONFIG_NFS_V4_1)
 351
 352 /*
 353  * nfs4_free_slot - free a slot and efficiently update slot table.
 354  *
 355  * freeing a slot is trivially done by clearing its respective bit
 356  * in the bitmap.
 357  * If the freed slotid equals highest_used_slotid we want to update it
 358  * so that the server would be able to size down the slot table if needed,
 359  * otherwise we know that the highest_used_slotid is still in use.
 360  * When updating highest_used_slotid there may be "holes" in the bitmap
 361  * so we need to scan down from highest_used_slotid to 0 looking for the now
 362  * highest slotid in use.
 363  * If none found, highest_used_slotid is set to -1.
 364  *
 365  * Must be called while holding tbl->slot_tbl_lock
 366  */
 367 static void
 368 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 369 {
 370         int slotid = free_slotid;
 371
 372         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 373         /* clear used bit in bitmap */
 374         __clear_bit(slotid, tbl->used_slots);
 375
 376         /* update highest_used_slotid when it is freed */
 377         if (slotid == tbl->highest_used_slotid) {
 378                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 379                 if (slotid < tbl->max_slots)
 380                         tbl->highest_used_slotid = slotid;
 381                 else
 382                         tbl->highest_used_slotid = -1;
 383         }
 384         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 385                 free_slotid, tbl->highest_used_slotid);
 386 }
 387
 388 /*
 389  * Signal state manager thread if session fore channel is drained
 390  */
 391 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 392 {
 393         struct rpc_task *task;
 394
 395         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 396                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 397                 if (task)
 398                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 399                 return;
 400         }
 401
 402         if (ses->fc_slot_table.highest_used_slotid != -1)
 403                 return;
 404
 405         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 406         complete(&ses->fc_slot_table.complete);
 407 }
 408
 409 /*
 410  * Signal state manager thread if session back channel is drained
 411  */
 412 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 413 {
 414         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 415             ses->bc_slot_table.highest_used_slotid != -1)
 416                 return;
 417         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 418         complete(&ses->bc_slot_table.complete);
 419 }
 420
 421 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 422 {
 423         struct nfs4_slot_table *tbl;
 424
 425         tbl = &res->sr_session->fc_slot_table;
 426         if (!res->sr_slot) {
 427                 /* just wake up the next guy waiting since
 428                  * we may have not consumed a slot after all */
 429                 dprintk("%s: No slot\n", __func__);
 430                 return;
 431         }
 432
 433         spin_lock(&tbl->slot_tbl_lock);
 434         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 435         nfs4_check_drain_fc_complete(res->sr_session);
 436         spin_unlock(&tbl->slot_tbl_lock);
 437         res->sr_slot = NULL;
 438 }
 439
 440 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 441 {
 442         unsigned long timestamp;
 443         struct nfs_client *clp;
 444
 445         /*
 446          * sr_status remains 1 if an RPC level error occurred. The server
 447          * may or may not have processed the sequence operation..
 448          * Proceed as if the server received and processed the sequence
 449          * operation.
 450          */
 451         if (res->sr_status == 1)
 452                 res->sr_status = NFS_OK;
 453
 454         /* don't increment the sequence number if the task wasn't sent */
 455         if (!RPC_WAS_SENT(task))
 456                 goto out;
 457
 458         /* Check the SEQUENCE operation status */
 459         switch (res->sr_status) {
 460         case 0:
 461                 /* Update the slot's sequence and clientid lease timer */
 462                 ++res->sr_slot->seq_nr;
 463                 timestamp = res->sr_renewal_time;
 464                 clp = res->sr_session->clp;
 465                 do_renew_lease(clp, timestamp);
 466                 /* Check sequence flags */
 467                 if (res->sr_status_flags != 0)
 468                         nfs4_schedule_lease_recovery(clp);
 469                 break;
 470         case -NFS4ERR_DELAY:
 471                 /* The server detected a resend of the RPC call and
 472                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 473                  * of RFC5661.
 474                  */
 475                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 476                         __func__,
 477                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 478                         res->sr_slot->seq_nr);
 479                 goto out_retry;
 480         default:
 481                 /* Just update the slot sequence no. */
 482                 ++res->sr_slot->seq_nr;
 483         }
 484 out:
 485         /* The session may be reset by one of the error handlers. */
 486         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 487         nfs41_sequence_free_slot(res);
 488         return 1;
 489 out_retry:
 490         if (!rpc_restart_call(task))
 491                 goto out;
 492         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 493         return 0;
 494 }
 495
 496 static int nfs4_sequence_done(struct rpc_task *task,
 497                                struct nfs4_sequence_res *res)
 498 {
 499         if (res->sr_session == NULL)
 500                 return 1;
 501         return nfs41_sequence_done(task, res);
 502 }
 503
 504 /*
 505  * nfs4_find_slot - efficiently look for a free slot
 506  *
 507  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 508  * If found, we mark the slot as used, update the highest_used_slotid,
 509  * and respectively set up the sequence operation args.
 510  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 511  *
 512  * Note: must be called with under the slot_tbl_lock.
 513  */
 514 static u8
 515 nfs4_find_slot(struct nfs4_slot_table *tbl)
 516 {
 517         int slotid;
 518         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 519         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 520
 521         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 522                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 523                 tbl->max_slots);
 524         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 525         if (slotid >= tbl->max_slots)
 526                 goto out;
 527         __set_bit(slotid, tbl->used_slots);
 528         if (slotid > tbl->highest_used_slotid)
 529                 tbl->highest_used_slotid = slotid;
 530         ret_id = slotid;
 531 out:
 532         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 533                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 534         return ret_id;
 535 }
 536
 537 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 538                 struct nfs4_sequence_res *res, int cache_reply)
 539 {
 540         args->sa_session = NULL;
 541         args->sa_cache_this = 0;
 542         if (cache_reply)
 543                 args->sa_cache_this = 1;
 544         res->sr_session = NULL;
 545         res->sr_slot = NULL;
 546 }
 547
 548 int nfs41_setup_sequence(struct nfs4_session *session,
 549                                 struct nfs4_sequence_args *args,
 550                                 struct nfs4_sequence_res *res,
 551                                 struct rpc_task *task)
 552 {
 553         struct nfs4_slot *slot;
 554         struct nfs4_slot_table *tbl;
 555         u8 slotid;
 556
 557         dprintk("--> %s\n", __func__);
 558         /* slot already allocated? */
 559         if (res->sr_slot != NULL)
 560                 return 0;
 561
 562         tbl = &session->fc_slot_table;
 563
 564         spin_lock(&tbl->slot_tbl_lock);
 565         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 566             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 567                 /* The state manager will wait until the slot table is empty */
 568                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 569                 spin_unlock(&tbl->slot_tbl_lock);
 570                 dprintk("%s session is draining\n", __func__);
 571                 return -EAGAIN;
 572         }
 573
 574         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 575             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 576                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 577                 spin_unlock(&tbl->slot_tbl_lock);
 578                 dprintk("%s enforce FIFO order\n", __func__);
 579                 return -EAGAIN;
 580         }
 581
 582         slotid = nfs4_find_slot(tbl);
 583         if (slotid == NFS4_MAX_SLOT_TABLE) {
 584                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 585                 spin_unlock(&tbl->slot_tbl_lock);
 586                 dprintk("<-- %s: no free slots\n", __func__);
 587                 return -EAGAIN;
 588         }
 589         spin_unlock(&tbl->slot_tbl_lock);
 590
 591         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 592         slot = tbl->slots + slotid;
 593         args->sa_session = session;
 594         args->sa_slotid = slotid;
 595
 596         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 597
 598         res->sr_session = session;
 599         res->sr_slot = slot;
 600         res->sr_renewal_time = jiffies;
 601         res->sr_status_flags = 0;
 602         /*
 603          * sr_status is only set in decode_sequence, and so will remain
 604          * set to 1 if an rpc level failure occurs.
 605          */
 606         res->sr_status = 1;
 607         return 0;
 608 }
 609 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 610
 611 int nfs4_setup_sequence(const struct nfs_server *server,
 612                         struct nfs4_sequence_args *args,
 613                         struct nfs4_sequence_res *res,
 614                         struct rpc_task *task)
 615 {
 616         struct nfs4_session *session = nfs4_get_session(server);
 617         int ret = 0;
 618
 619         if (session == NULL)
 620                 goto out;
 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, task);
 627 out:
 628         dprintk("<-- %s status=%d\n", __func__, ret);
 629         return ret;
 630 }
 631
 632 struct nfs41_call_sync_data {
 633         const struct nfs_server *seq_server;
 634         struct nfs4_sequence_args *seq_args;
 635         struct nfs4_sequence_res *seq_res;
 636 };
 637
 638 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 639 {
 640         struct nfs41_call_sync_data *data = calldata;
 641
 642         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 643
 644         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 645                                 data->seq_res, task))
 646                 return;
 647         rpc_call_start(task);
 648 }
 649
 650 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 651 {
 652         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 653         nfs41_call_sync_prepare(task, calldata);
 654 }
 655
 656 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 657 {
 658         struct nfs41_call_sync_data *data = calldata;
 659
 660         nfs41_sequence_done(task, data->seq_res);
 661 }
 662
 663 struct rpc_call_ops nfs41_call_sync_ops = {
 664         .rpc_call_prepare = nfs41_call_sync_prepare,
 665         .rpc_call_done = nfs41_call_sync_done,
 666 };
 667
 668 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 669         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 670         .rpc_call_done = nfs41_call_sync_done,
 671 };
 672
 673 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 674                                    struct nfs_server *server,
 675                                    struct rpc_message *msg,
 676                                    struct nfs4_sequence_args *args,
 677                                    struct nfs4_sequence_res *res,
 678                                    int privileged)
 679 {
 680         int ret;
 681         struct rpc_task *task;
 682         struct nfs41_call_sync_data data = {
 683                 .seq_server = server,
 684                 .seq_args = args,
 685                 .seq_res = res,
 686         };
 687         struct rpc_task_setup task_setup = {
 688                 .rpc_client = clnt,
 689                 .rpc_message = msg,
 690                 .callback_ops = &nfs41_call_sync_ops,
 691                 .callback_data = &data
 692         };
 693
 694         if (privileged)
 695                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 696         task = rpc_run_task(&task_setup);
 697         if (IS_ERR(task))
 698                 ret = PTR_ERR(task);
 699         else {
 700                 ret = task->tk_status;
 701                 rpc_put_task(task);
 702         }
 703         return ret;
 704 }
 705
 706 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 707                             struct nfs_server *server,
 708                             struct rpc_message *msg,
 709                             struct nfs4_sequence_args *args,
 710                             struct nfs4_sequence_res *res,
 711                             int cache_reply)
 712 {
 713         nfs41_init_sequence(args, res, cache_reply);
 714         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 715 }
 716
 717 #else
 718 static inline
 719 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 720                 struct nfs4_sequence_res *res, int cache_reply)
 721 {
 722 }
 723
 724 static int nfs4_sequence_done(struct rpc_task *task,
 725                                struct nfs4_sequence_res *res)
 726 {
 727         return 1;
 728 }
 729 #endif /* CONFIG_NFS_V4_1 */
 730
 731 int _nfs4_call_sync(struct rpc_clnt *clnt,
 732                     struct nfs_server *server,
 733                     struct rpc_message *msg,
 734                     struct nfs4_sequence_args *args,
 735                     struct nfs4_sequence_res *res,
 736                     int cache_reply)
 737 {
 738         nfs41_init_sequence(args, res, cache_reply);
 739         return rpc_call_sync(clnt, msg, 0);
 740 }
 741
 742 static inline
 743 int nfs4_call_sync(struct rpc_clnt *clnt,
 744                    struct nfs_server *server,
 745                    struct rpc_message *msg,
 746                    struct nfs4_sequence_args *args,
 747                    struct nfs4_sequence_res *res,
 748                    int cache_reply)
 749 {
 750         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 751                                                 args, res, cache_reply);
 752 }
 753
 754 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 755 {
 756         struct nfs_inode *nfsi = NFS_I(dir);
 757
 758         spin_lock(&dir->i_lock);
 759         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 760         if (!cinfo->atomic || cinfo->before != dir->i_version)
 761                 nfs_force_lookup_revalidate(dir);
 762         dir->i_version = cinfo->after;
 763         spin_unlock(&dir->i_lock);
 764 }
 765
 766 struct nfs4_opendata {
 767         struct kref kref;
 768         struct nfs_openargs o_arg;
 769         struct nfs_openres o_res;
 770         struct nfs_open_confirmargs c_arg;
 771         struct nfs_open_confirmres c_res;
 772         struct nfs4_string owner_name;
 773         struct nfs4_string group_name;
 774         struct nfs_fattr f_attr;
 775         struct nfs_fattr dir_attr;
 776         struct dentry *dir;
 777         struct dentry *dentry;
 778         struct nfs4_state_owner *owner;
 779         struct nfs4_state *state;
 780         struct iattr attrs;
 781         unsigned long timestamp;
 782         unsigned int rpc_done : 1;
 783         int rpc_status;
 784         int cancelled;
 785 };
 786
 787
 788 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 789 {
 790         p->o_res.f_attr = &p->f_attr;
 791         p->o_res.dir_attr = &p->dir_attr;
 792         p->o_res.seqid = p->o_arg.seqid;
 793         p->c_res.seqid = p->c_arg.seqid;
 794         p->o_res.server = p->o_arg.server;
 795         nfs_fattr_init(&p->f_attr);
 796         nfs_fattr_init(&p->dir_attr);
 797         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 798 }
 799
 800 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 801                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 802                 const struct iattr *attrs,
 803                 gfp_t gfp_mask)
 804 {
 805         struct dentry *parent = dget_parent(dentry);
 806         struct inode *dir = parent->d_inode;
 807         struct nfs_server *server = NFS_SERVER(dir);
 808         struct nfs4_opendata *p;
 809
 810         p = kzalloc(sizeof(*p), gfp_mask);
 811         if (p == NULL)
 812                 goto err;
 813         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 814         if (p->o_arg.seqid == NULL)
 815                 goto err_free;
 816         nfs_sb_active(dentry->d_sb);
 817         p->dentry = dget(dentry);
 818         p->dir = parent;
 819         p->owner = sp;
 820         atomic_inc(&sp->so_count);
 821         p->o_arg.fh = NFS_FH(dir);
 822         p->o_arg.open_flags = flags;
 823         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 824         p->o_arg.clientid = server->nfs_client->cl_clientid;
 825         p->o_arg.id = sp->so_owner_id;
 826         p->o_arg.name = &dentry->d_name;
 827         p->o_arg.server = server;
 828         p->o_arg.bitmask = server->attr_bitmask;
 829         p->o_arg.dir_bitmask = server->cache_consistency_bitmask;
 830         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 831         if (flags & O_CREAT) {
 832                 u32 *s;
 833
 834                 p->o_arg.u.attrs = &p->attrs;
 835                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 836                 s = (u32 *) p->o_arg.u.verifier.data;
 837                 s[0] = jiffies;
 838                 s[1] = current->pid;
 839         }
 840         p->c_arg.fh = &p->o_res.fh;
 841         p->c_arg.stateid = &p->o_res.stateid;
 842         p->c_arg.seqid = p->o_arg.seqid;
 843         nfs4_init_opendata_res(p);
 844         kref_init(&p->kref);
 845         return p;
 846 err_free:
 847         kfree(p);
 848 err:
 849         dput(parent);
 850         return NULL;
 851 }
 852
 853 static void nfs4_opendata_free(struct kref *kref)
 854 {
 855         struct nfs4_opendata *p = container_of(kref,
 856                         struct nfs4_opendata, kref);
 857         struct super_block *sb = p->dentry->d_sb;
 858
 859         nfs_free_seqid(p->o_arg.seqid);
 860         if (p->state != NULL)
 861                 nfs4_put_open_state(p->state);
 862         nfs4_put_state_owner(p->owner);
 863         dput(p->dir);
 864         dput(p->dentry);
 865         nfs_sb_deactive(sb);
 866         nfs_fattr_free_names(&p->f_attr);
 867         kfree(p);
 868 }
 869
 870 static void nfs4_opendata_put(struct nfs4_opendata *p)
 871 {
 872         if (p != NULL)
 873                 kref_put(&p->kref, nfs4_opendata_free);
 874 }
 875
 876 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 877 {
 878         int ret;
 879
 880         ret = rpc_wait_for_completion_task(task);
 881         return ret;
 882 }
 883
 884 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 885 {
 886         int ret = 0;
 887
 888         if (open_mode & O_EXCL)
 889                 goto out;
 890         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 891                 case FMODE_READ:
 892                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 893                                 && state->n_rdonly != 0;
 894                         break;
 895                 case FMODE_WRITE:
 896                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 897                                 && state->n_wronly != 0;
 898                         break;
 899                 case FMODE_READ|FMODE_WRITE:
 900                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 901                                 && state->n_rdwr != 0;
 902         }
 903 out:
 904         return ret;
 905 }
 906
 907 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 908 {
 909         if (delegation == NULL)
 910                 return 0;
 911         if ((delegation->type & fmode) != fmode)
 912                 return 0;
 913         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 914                 return 0;
 915         nfs_mark_delegation_referenced(delegation);
 916         return 1;
 917 }
 918
 919 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 920 {
 921         switch (fmode) {
 922                 case FMODE_WRITE:
 923                         state->n_wronly++;
 924                         break;
 925                 case FMODE_READ:
 926                         state->n_rdonly++;
 927                         break;
 928                 case FMODE_READ|FMODE_WRITE:
 929                         state->n_rdwr++;
 930         }
 931         nfs4_state_set_mode_locked(state, state->state | fmode);
 932 }
 933
 934 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 935 {
 936         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 937                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 938         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 939         switch (fmode) {
 940                 case FMODE_READ:
 941                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 942                         break;
 943                 case FMODE_WRITE:
 944                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 945                         break;
 946                 case FMODE_READ|FMODE_WRITE:
 947                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 948         }
 949 }
 950
 951 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 952 {
 953         write_seqlock(&state->seqlock);
 954         nfs_set_open_stateid_locked(state, stateid, fmode);
 955         write_sequnlock(&state->seqlock);
 956 }
 957
 958 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 959 {
 960         /*
 961          * Protect the call to nfs4_state_set_mode_locked and
 962          * serialise the stateid update
 963          */
 964         write_seqlock(&state->seqlock);
 965         if (deleg_stateid != NULL) {
 966                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 967                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 968         }
 969         if (open_stateid != NULL)
 970                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 971         write_sequnlock(&state->seqlock);
 972         spin_lock(&state->owner->so_lock);
 973         update_open_stateflags(state, fmode);
 974         spin_unlock(&state->owner->so_lock);
 975 }
 976
 977 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 978 {
 979         struct nfs_inode *nfsi = NFS_I(state->inode);
 980         struct nfs_delegation *deleg_cur;
 981         int ret = 0;
 982
 983         fmode &= (FMODE_READ|FMODE_WRITE);
 984
 985         rcu_read_lock();
 986         deleg_cur = rcu_dereference(nfsi->delegation);
 987         if (deleg_cur == NULL)
 988                 goto no_delegation;
 989
 990         spin_lock(&deleg_cur->lock);
 991         if (nfsi->delegation != deleg_cur ||
 992             (deleg_cur->type & fmode) != fmode)
 993                 goto no_delegation_unlock;
 994
 995         if (delegation == NULL)
 996                 delegation = &deleg_cur->stateid;
 997         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 998                 goto no_delegation_unlock;
 999
1000         nfs_mark_delegation_referenced(deleg_cur);
1001         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1002         ret = 1;
1003 no_delegation_unlock:
1004         spin_unlock(&deleg_cur->lock);
1005 no_delegation:
1006         rcu_read_unlock();
1007
1008         if (!ret && open_stateid != NULL) {
1009                 __update_open_stateid(state, open_stateid, NULL, fmode);
1010                 ret = 1;
1011         }
1012
1013         return ret;
1014 }
1015
1016
1017 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1018 {
1019         struct nfs_delegation *delegation;
1020
1021         rcu_read_lock();
1022         delegation = rcu_dereference(NFS_I(inode)->delegation);
1023         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1024                 rcu_read_unlock();
1025                 return;
1026         }
1027         rcu_read_unlock();
1028         nfs_inode_return_delegation(inode);
1029 }
1030
1031 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1032 {
1033         struct nfs4_state *state = opendata->state;
1034         struct nfs_inode *nfsi = NFS_I(state->inode);
1035         struct nfs_delegation *delegation;
1036         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1037         fmode_t fmode = opendata->o_arg.fmode;
1038         nfs4_stateid stateid;
1039         int ret = -EAGAIN;
1040
1041         for (;;) {
1042                 if (can_open_cached(state, fmode, open_mode)) {
1043                         spin_lock(&state->owner->so_lock);
1044                         if (can_open_cached(state, fmode, open_mode)) {
1045                                 update_open_stateflags(state, fmode);
1046                                 spin_unlock(&state->owner->so_lock);
1047                                 goto out_return_state;
1048                         }
1049                         spin_unlock(&state->owner->so_lock);
1050                 }
1051                 rcu_read_lock();
1052                 delegation = rcu_dereference(nfsi->delegation);
1053                 if (!can_open_delegated(delegation, fmode)) {
1054                         rcu_read_unlock();
1055                         break;
1056                 }
1057                 /* Save the delegation */
1058                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1059                 rcu_read_unlock();
1060                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1061                 if (ret != 0)
1062                         goto out;
1063                 ret = -EAGAIN;
1064
1065                 /* Try to update the stateid using the delegation */
1066                 if (update_open_stateid(state, NULL, &stateid, fmode))
1067                         goto out_return_state;
1068         }
1069 out:
1070         return ERR_PTR(ret);
1071 out_return_state:
1072         atomic_inc(&state->count);
1073         return state;
1074 }
1075
1076 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1077 {
1078         struct inode *inode;
1079         struct nfs4_state *state = NULL;
1080         struct nfs_delegation *delegation;
1081         int ret;
1082
1083         if (!data->rpc_done) {
1084                 state = nfs4_try_open_cached(data);
1085                 goto out;
1086         }
1087
1088         ret = -EAGAIN;
1089         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1090                 goto err;
1091         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1092         ret = PTR_ERR(inode);
1093         if (IS_ERR(inode))
1094                 goto err;
1095         ret = -ENOMEM;
1096         state = nfs4_get_open_state(inode, data->owner);
1097         if (state == NULL)
1098                 goto err_put_inode;
1099         if (data->o_res.delegation_type != 0) {
1100                 int delegation_flags = 0;
1101
1102                 rcu_read_lock();
1103                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1104                 if (delegation)
1105                         delegation_flags = delegation->flags;
1106                 rcu_read_unlock();
1107                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1108                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1109                                         "returning a delegation for "
1110                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1111                                         NFS_CLIENT(inode)->cl_server);
1112                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1113                         nfs_inode_set_delegation(state->inode,
1114                                         data->owner->so_cred,
1115                                         &data->o_res);
1116                 else
1117                         nfs_inode_reclaim_delegation(state->inode,
1118                                         data->owner->so_cred,
1119                                         &data->o_res);
1120         }
1121
1122         update_open_stateid(state, &data->o_res.stateid, NULL,
1123                         data->o_arg.fmode);
1124         iput(inode);
1125 out:
1126         return state;
1127 err_put_inode:
1128         iput(inode);
1129 err:
1130         return ERR_PTR(ret);
1131 }
1132
1133 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1134 {
1135         struct nfs_inode *nfsi = NFS_I(state->inode);
1136         struct nfs_open_context *ctx;
1137
1138         spin_lock(&state->inode->i_lock);
1139         list_for_each_entry(ctx, &nfsi->open_files, list) {
1140                 if (ctx->state != state)
1141                         continue;
1142                 get_nfs_open_context(ctx);
1143                 spin_unlock(&state->inode->i_lock);
1144                 return ctx;
1145         }
1146         spin_unlock(&state->inode->i_lock);
1147         return ERR_PTR(-ENOENT);
1148 }
1149
1150 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1151 {
1152         struct nfs4_opendata *opendata;
1153
1154         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1155         if (opendata == NULL)
1156                 return ERR_PTR(-ENOMEM);
1157         opendata->state = state;
1158         atomic_inc(&state->count);
1159         return opendata;
1160 }
1161
1162 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1163 {
1164         struct nfs4_state *newstate;
1165         int ret;
1166
1167         opendata->o_arg.open_flags = 0;
1168         opendata->o_arg.fmode = fmode;
1169         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1170         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1171         nfs4_init_opendata_res(opendata);
1172         ret = _nfs4_recover_proc_open(opendata);
1173         if (ret != 0)
1174                 return ret;
1175         newstate = nfs4_opendata_to_nfs4_state(opendata);
1176         if (IS_ERR(newstate))
1177                 return PTR_ERR(newstate);
1178         nfs4_close_state(newstate, fmode);
1179         *res = newstate;
1180         return 0;
1181 }
1182
1183 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1184 {
1185         struct nfs4_state *newstate;
1186         int ret;
1187
1188         /* memory barrier prior to reading state->n_* */
1189         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1190         smp_rmb();
1191         if (state->n_rdwr != 0) {
1192                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1193                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1194                 if (ret != 0)
1195                         return ret;
1196                 if (newstate != state)
1197                         return -ESTALE;
1198         }
1199         if (state->n_wronly != 0) {
1200                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1201                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1202                 if (ret != 0)
1203                         return ret;
1204                 if (newstate != state)
1205                         return -ESTALE;
1206         }
1207         if (state->n_rdonly != 0) {
1208                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1209                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1210                 if (ret != 0)
1211                         return ret;
1212                 if (newstate != state)
1213                         return -ESTALE;
1214         }
1215         /*
1216          * We may have performed cached opens for all three recoveries.
1217          * Check if we need to update the current stateid.
1218          */
1219         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1220             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1221                 write_seqlock(&state->seqlock);
1222                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1223                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1224                 write_sequnlock(&state->seqlock);
1225         }
1226         return 0;
1227 }
1228
1229 /*
1230  * OPEN_RECLAIM:
1231  *      reclaim state on the server after a reboot.
1232  */
1233 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1234 {
1235         struct nfs_delegation *delegation;
1236         struct nfs4_opendata *opendata;
1237         fmode_t delegation_type = 0;
1238         int status;
1239
1240         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1241         if (IS_ERR(opendata))
1242                 return PTR_ERR(opendata);
1243         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1244         opendata->o_arg.fh = NFS_FH(state->inode);
1245         rcu_read_lock();
1246         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1247         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1248                 delegation_type = delegation->type;
1249         rcu_read_unlock();
1250         opendata->o_arg.u.delegation_type = delegation_type;
1251         status = nfs4_open_recover(opendata, state);
1252         nfs4_opendata_put(opendata);
1253         return status;
1254 }
1255
1256 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1257 {
1258         struct nfs_server *server = NFS_SERVER(state->inode);
1259         struct nfs4_exception exception = { };
1260         int err;
1261         do {
1262                 err = _nfs4_do_open_reclaim(ctx, state);
1263                 if (err != -NFS4ERR_DELAY)
1264                         break;
1265                 nfs4_handle_exception(server, err, &exception);
1266         } while (exception.retry);
1267         return err;
1268 }
1269
1270 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1271 {
1272         struct nfs_open_context *ctx;
1273         int ret;
1274
1275         ctx = nfs4_state_find_open_context(state);
1276         if (IS_ERR(ctx))
1277                 return PTR_ERR(ctx);
1278         ret = nfs4_do_open_reclaim(ctx, state);
1279         put_nfs_open_context(ctx);
1280         return ret;
1281 }
1282
1283 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1284 {
1285         struct nfs4_opendata *opendata;
1286         int ret;
1287
1288         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1289         if (IS_ERR(opendata))
1290                 return PTR_ERR(opendata);
1291         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1292         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1293                         sizeof(opendata->o_arg.u.delegation.data));
1294         ret = nfs4_open_recover(opendata, state);
1295         nfs4_opendata_put(opendata);
1296         return ret;
1297 }
1298
1299 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1300 {
1301         struct nfs4_exception exception = { };
1302         struct nfs_server *server = NFS_SERVER(state->inode);
1303         int err;
1304         do {
1305                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1306                 switch (err) {
1307                         case 0:
1308                         case -ENOENT:
1309                         case -ESTALE:
1310                                 goto out;
1311                         case -NFS4ERR_BADSESSION:
1312                         case -NFS4ERR_BADSLOT:
1313                         case -NFS4ERR_BAD_HIGH_SLOT:
1314                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1315                         case -NFS4ERR_DEADSESSION:
1316                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1317                                 goto out;
1318                         case -NFS4ERR_STALE_CLIENTID:
1319                         case -NFS4ERR_STALE_STATEID:
1320                         case -NFS4ERR_EXPIRED:
1321                                 /* Don't recall a delegation if it was lost */
1322                                 nfs4_schedule_lease_recovery(server->nfs_client);
1323                                 goto out;
1324                         case -ERESTARTSYS:
1325                                 /*
1326                                  * The show must go on: exit, but mark the
1327                                  * stateid as needing recovery.
1328                                  */
1329                         case -NFS4ERR_ADMIN_REVOKED:
1330                         case -NFS4ERR_BAD_STATEID:
1331                                 nfs4_schedule_stateid_recovery(server, state);
1332                         case -EKEYEXPIRED:
1333                                 /*
1334                                  * User RPCSEC_GSS context has expired.
1335                                  * We cannot recover this stateid now, so
1336                                  * skip it and allow recovery thread to
1337                                  * proceed.
1338                                  */
1339                         case -ENOMEM:
1340                                 err = 0;
1341                                 goto out;
1342                 }
1343                 err = nfs4_handle_exception(server, err, &exception);
1344         } while (exception.retry);
1345 out:
1346         return err;
1347 }
1348
1349 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1350 {
1351         struct nfs4_opendata *data = calldata;
1352
1353         data->rpc_status = task->tk_status;
1354         if (data->rpc_status == 0) {
1355                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1356                                 sizeof(data->o_res.stateid.data));
1357                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1358                 renew_lease(data->o_res.server, data->timestamp);
1359                 data->rpc_done = 1;
1360         }
1361 }
1362
1363 static void nfs4_open_confirm_release(void *calldata)
1364 {
1365         struct nfs4_opendata *data = calldata;
1366         struct nfs4_state *state = NULL;
1367
1368         /* If this request hasn't been cancelled, do nothing */
1369         if (data->cancelled == 0)
1370                 goto out_free;
1371         /* In case of error, no cleanup! */
1372         if (!data->rpc_done)
1373                 goto out_free;
1374         state = nfs4_opendata_to_nfs4_state(data);
1375         if (!IS_ERR(state))
1376                 nfs4_close_state(state, data->o_arg.fmode);
1377 out_free:
1378         nfs4_opendata_put(data);
1379 }
1380
1381 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1382         .rpc_call_done = nfs4_open_confirm_done,
1383         .rpc_release = nfs4_open_confirm_release,
1384 };
1385
1386 /*
1387  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1388  */
1389 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1390 {
1391         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1392         struct rpc_task *task;
1393         struct  rpc_message msg = {
1394                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1395                 .rpc_argp = &data->c_arg,
1396                 .rpc_resp = &data->c_res,
1397                 .rpc_cred = data->owner->so_cred,
1398         };
1399         struct rpc_task_setup task_setup_data = {
1400                 .rpc_client = server->client,
1401                 .rpc_message = &msg,
1402                 .callback_ops = &nfs4_open_confirm_ops,
1403                 .callback_data = data,
1404                 .workqueue = nfsiod_workqueue,
1405                 .flags = RPC_TASK_ASYNC,
1406         };
1407         int status;
1408
1409         kref_get(&data->kref);
1410         data->rpc_done = 0;
1411         data->rpc_status = 0;
1412         data->timestamp = jiffies;
1413         task = rpc_run_task(&task_setup_data);
1414         if (IS_ERR(task))
1415                 return PTR_ERR(task);
1416         status = nfs4_wait_for_completion_rpc_task(task);
1417         if (status != 0) {
1418                 data->cancelled = 1;
1419                 smp_wmb();
1420         } else
1421                 status = data->rpc_status;
1422         rpc_put_task(task);
1423         return status;
1424 }
1425
1426 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1427 {
1428         struct nfs4_opendata *data = calldata;
1429         struct nfs4_state_owner *sp = data->owner;
1430
1431         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1432                 return;
1433         /*
1434          * Check if we still need to send an OPEN call, or if we can use
1435          * a delegation instead.
1436          */
1437         if (data->state != NULL) {
1438                 struct nfs_delegation *delegation;
1439
1440                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1441                         goto out_no_action;
1442                 rcu_read_lock();
1443                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1444                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1445                     can_open_delegated(delegation, data->o_arg.fmode))
1446                         goto unlock_no_action;
1447                 rcu_read_unlock();
1448         }
1449         /* Update sequence id. */
1450         data->o_arg.id = sp->so_owner_id;
1451         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1452         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1453                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1454                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1455         }
1456         data->timestamp = jiffies;
1457         if (nfs4_setup_sequence(data->o_arg.server,
1458                                 &data->o_arg.seq_args,
1459                                 &data->o_res.seq_res, task))
1460                 return;
1461         rpc_call_start(task);
1462         return;
1463 unlock_no_action:
1464         rcu_read_unlock();
1465 out_no_action:
1466         task->tk_action = NULL;
1467
1468 }
1469
1470 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1471 {
1472         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1473         nfs4_open_prepare(task, calldata);
1474 }
1475
1476 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1477 {
1478         struct nfs4_opendata *data = calldata;
1479
1480         data->rpc_status = task->tk_status;
1481
1482         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1483                 return;
1484
1485         if (task->tk_status == 0) {
1486                 switch (data->o_res.f_attr->mode & S_IFMT) {
1487                         case S_IFREG:
1488                                 break;
1489                         case S_IFLNK:
1490                                 data->rpc_status = -ELOOP;
1491                                 break;
1492                         case S_IFDIR:
1493                                 data->rpc_status = -EISDIR;
1494                                 break;
1495                         default:
1496                                 data->rpc_status = -ENOTDIR;
1497                 }
1498                 renew_lease(data->o_res.server, data->timestamp);
1499                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1500                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1501         }
1502         data->rpc_done = 1;
1503 }
1504
1505 static void nfs4_open_release(void *calldata)
1506 {
1507         struct nfs4_opendata *data = calldata;
1508         struct nfs4_state *state = NULL;
1509
1510         /* If this request hasn't been cancelled, do nothing */
1511         if (data->cancelled == 0)
1512                 goto out_free;
1513         /* In case of error, no cleanup! */
1514         if (data->rpc_status != 0 || !data->rpc_done)
1515                 goto out_free;
1516         /* In case we need an open_confirm, no cleanup! */
1517         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1518                 goto out_free;
1519         state = nfs4_opendata_to_nfs4_state(data);
1520         if (!IS_ERR(state))
1521                 nfs4_close_state(state, data->o_arg.fmode);
1522 out_free:
1523         nfs4_opendata_put(data);
1524 }
1525
1526 static const struct rpc_call_ops nfs4_open_ops = {
1527         .rpc_call_prepare = nfs4_open_prepare,
1528         .rpc_call_done = nfs4_open_done,
1529         .rpc_release = nfs4_open_release,
1530 };
1531
1532 static const struct rpc_call_ops nfs4_recover_open_ops = {
1533         .rpc_call_prepare = nfs4_recover_open_prepare,
1534         .rpc_call_done = nfs4_open_done,
1535         .rpc_release = nfs4_open_release,
1536 };
1537
1538 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1539 {
1540         struct inode *dir = data->dir->d_inode;
1541         struct nfs_server *server = NFS_SERVER(dir);
1542         struct nfs_openargs *o_arg = &data->o_arg;
1543         struct nfs_openres *o_res = &data->o_res;
1544         struct rpc_task *task;
1545         struct rpc_message msg = {
1546                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1547                 .rpc_argp = o_arg,
1548                 .rpc_resp = o_res,
1549                 .rpc_cred = data->owner->so_cred,
1550         };
1551         struct rpc_task_setup task_setup_data = {
1552                 .rpc_client = server->client,
1553                 .rpc_message = &msg,
1554                 .callback_ops = &nfs4_open_ops,
1555                 .callback_data = data,
1556                 .workqueue = nfsiod_workqueue,
1557                 .flags = RPC_TASK_ASYNC,
1558         };
1559         int status;
1560
1561         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1562         kref_get(&data->kref);
1563         data->rpc_done = 0;
1564         data->rpc_status = 0;
1565         data->cancelled = 0;
1566         if (isrecover)
1567                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1568         task = rpc_run_task(&task_setup_data);
1569         if (IS_ERR(task))
1570                 return PTR_ERR(task);
1571         status = nfs4_wait_for_completion_rpc_task(task);
1572         if (status != 0) {
1573                 data->cancelled = 1;
1574                 smp_wmb();
1575         } else
1576                 status = data->rpc_status;
1577         rpc_put_task(task);
1578
1579         return status;
1580 }
1581
1582 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1583 {
1584         struct inode *dir = data->dir->d_inode;
1585         struct nfs_openres *o_res = &data->o_res;
1586         int status;
1587
1588         status = nfs4_run_open_task(data, 1);
1589         if (status != 0 || !data->rpc_done)
1590                 return status;
1591
1592         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1593
1594         nfs_refresh_inode(dir, o_res->dir_attr);
1595
1596         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1597                 status = _nfs4_proc_open_confirm(data);
1598                 if (status != 0)
1599                         return status;
1600         }
1601
1602         return status;
1603 }
1604
1605 /*
1606  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1607  */
1608 static int _nfs4_proc_open(struct nfs4_opendata *data)
1609 {
1610         struct inode *dir = data->dir->d_inode;
1611         struct nfs_server *server = NFS_SERVER(dir);
1612         struct nfs_openargs *o_arg = &data->o_arg;
1613         struct nfs_openres *o_res = &data->o_res;
1614         int status;
1615
1616         status = nfs4_run_open_task(data, 0);
1617         if (!data->rpc_done)
1618                 return status;
1619         if (status != 0) {
1620                 if (status == -NFS4ERR_BADNAME &&
1621                                 !(o_arg->open_flags & O_CREAT))
1622                         return -ENOENT;
1623                 return status;
1624         }
1625
1626         nfs_fattr_map_and_free_names(server, &data->f_attr);
1627
1628         if (o_arg->open_flags & O_CREAT) {
1629                 update_changeattr(dir, &o_res->cinfo);
1630                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1631         } else
1632                 nfs_refresh_inode(dir, o_res->dir_attr);
1633         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1634                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1635         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1636                 status = _nfs4_proc_open_confirm(data);
1637                 if (status != 0)
1638                         return status;
1639         }
1640         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1641                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1642         return 0;
1643 }
1644
1645 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1646 {
1647         unsigned int loop;
1648         int ret;
1649
1650         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1651                 ret = nfs4_wait_clnt_recover(clp);
1652                 if (ret != 0)
1653                         break;
1654                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1655                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1656                         break;
1657                 nfs4_schedule_state_manager(clp);
1658                 ret = -EIO;
1659         }
1660         return ret;
1661 }
1662
1663 static int nfs4_recover_expired_lease(struct nfs_server *server)
1664 {
1665         return nfs4_client_recover_expired_lease(server->nfs_client);
1666 }
1667
1668 /*
1669  * OPEN_EXPIRED:
1670  *      reclaim state on the server after a network partition.
1671  *      Assumes caller holds the appropriate lock
1672  */
1673 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1674 {
1675         struct nfs4_opendata *opendata;
1676         int ret;
1677
1678         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1679         if (IS_ERR(opendata))
1680                 return PTR_ERR(opendata);
1681         ret = nfs4_open_recover(opendata, state);
1682         if (ret == -ESTALE)
1683                 d_drop(ctx->dentry);
1684         nfs4_opendata_put(opendata);
1685         return ret;
1686 }
1687
1688 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1689 {
1690         struct nfs_server *server = NFS_SERVER(state->inode);
1691         struct nfs4_exception exception = { };
1692         int err;
1693
1694         do {
1695                 err = _nfs4_open_expired(ctx, state);
1696                 switch (err) {
1697                 default:
1698                         goto out;
1699                 case -NFS4ERR_GRACE:
1700                 case -NFS4ERR_DELAY:
1701                         nfs4_handle_exception(server, err, &exception);
1702                         err = 0;
1703                 }
1704         } while (exception.retry);
1705 out:
1706         return err;
1707 }
1708
1709 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1710 {
1711         struct nfs_open_context *ctx;
1712         int ret;
1713
1714         ctx = nfs4_state_find_open_context(state);
1715         if (IS_ERR(ctx))
1716                 return PTR_ERR(ctx);
1717         ret = nfs4_do_open_expired(ctx, state);
1718         put_nfs_open_context(ctx);
1719         return ret;
1720 }
1721
1722 #if defined(CONFIG_NFS_V4_1)
1723 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1724 {
1725         int status;
1726         struct nfs_server *server = NFS_SERVER(state->inode);
1727
1728         status = nfs41_test_stateid(server, state);
1729         if (status == NFS_OK)
1730                 return 0;
1731         nfs41_free_stateid(server, state);
1732         return nfs4_open_expired(sp, state);
1733 }
1734 #endif
1735
1736 /*
1737  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1738  * fields corresponding to attributes that were used to store the verifier.
1739  * Make sure we clobber those fields in the later setattr call
1740  */
1741 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1742 {
1743         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1744             !(sattr->ia_valid & ATTR_ATIME_SET))
1745                 sattr->ia_valid |= ATTR_ATIME;
1746
1747         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1748             !(sattr->ia_valid & ATTR_MTIME_SET))
1749                 sattr->ia_valid |= ATTR_MTIME;
1750 }
1751
1752 /*
1753  * Returns a referenced nfs4_state
1754  */
1755 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)
1756 {
1757         struct nfs4_state_owner  *sp;
1758         struct nfs4_state     *state = NULL;
1759         struct nfs_server       *server = NFS_SERVER(dir);
1760         struct nfs4_opendata *opendata;
1761         int status;
1762
1763         /* Protect against reboot recovery conflicts */
1764         status = -ENOMEM;
1765         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1766         if (sp == NULL) {
1767                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1768                 goto out_err;
1769         }
1770         status = nfs4_recover_expired_lease(server);
1771         if (status != 0)
1772                 goto err_put_state_owner;
1773         if (dentry->d_inode != NULL)
1774                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1775         status = -ENOMEM;
1776         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1777         if (opendata == NULL)
1778                 goto err_put_state_owner;
1779
1780         if (dentry->d_inode != NULL)
1781                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1782
1783         status = _nfs4_proc_open(opendata);
1784         if (status != 0)
1785                 goto err_opendata_put;
1786
1787         state = nfs4_opendata_to_nfs4_state(opendata);
1788         status = PTR_ERR(state);
1789         if (IS_ERR(state))
1790                 goto err_opendata_put;
1791         if (server->caps & NFS_CAP_POSIX_LOCK)
1792                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1793
1794         if (opendata->o_arg.open_flags & O_EXCL) {
1795                 nfs4_exclusive_attrset(opendata, sattr);
1796
1797                 nfs_fattr_init(opendata->o_res.f_attr);
1798                 status = nfs4_do_setattr(state->inode, cred,
1799                                 opendata->o_res.f_attr, sattr,
1800                                 state);
1801                 if (status == 0)
1802                         nfs_setattr_update_inode(state->inode, sattr);
1803                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1804         }
1805         nfs4_opendata_put(opendata);
1806         nfs4_put_state_owner(sp);
1807         *res = state;
1808         return 0;
1809 err_opendata_put:
1810         nfs4_opendata_put(opendata);
1811 err_put_state_owner:
1812         nfs4_put_state_owner(sp);
1813 out_err:
1814         *res = NULL;
1815         return status;
1816 }
1817
1818
1819 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)
1820 {
1821         struct nfs4_exception exception = { };
1822         struct nfs4_state *res;
1823         int status;
1824
1825         do {
1826                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1827                 if (status == 0)
1828                         break;
1829                 /* NOTE: BAD_SEQID means the server and client disagree about the
1830                  * book-keeping w.r.t. state-changing operations
1831                  * (OPEN/CLOSE/LOCK/LOCKU...)
1832                  * It is actually a sign of a bug on the client or on the server.
1833                  *
1834                  * If we receive a BAD_SEQID error in the particular case of
1835                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1836                  * have unhashed the old state_owner for us, and that we can
1837                  * therefore safely retry using a new one. We should still warn
1838                  * the user though...
1839                  */
1840                 if (status == -NFS4ERR_BAD_SEQID) {
1841                         printk(KERN_WARNING "NFS: v4 server %s "
1842                                         " returned a bad sequence-id error!\n",
1843                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1844                         exception.retry = 1;
1845                         continue;
1846                 }
1847                 /*
1848                  * BAD_STATEID on OPEN means that the server cancelled our
1849                  * state before it received the OPEN_CONFIRM.
1850                  * Recover by retrying the request as per the discussion
1851                  * on Page 181 of RFC3530.
1852                  */
1853                 if (status == -NFS4ERR_BAD_STATEID) {
1854                         exception.retry = 1;
1855                         continue;
1856                 }
1857                 if (status == -EAGAIN) {
1858                         /* We must have found a delegation */
1859                         exception.retry = 1;
1860                         continue;
1861                 }
1862                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1863                                         status, &exception));
1864         } while (exception.retry);
1865         return res;
1866 }
1867
1868 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1869                             struct nfs_fattr *fattr, struct iattr *sattr,
1870                             struct nfs4_state *state)
1871 {
1872         struct nfs_server *server = NFS_SERVER(inode);
1873         struct nfs_setattrargs  arg = {
1874                 .fh             = NFS_FH(inode),
1875                 .iap            = sattr,
1876                 .server         = server,
1877                 .bitmask = server->attr_bitmask,
1878         };
1879         struct nfs_setattrres  res = {
1880                 .fattr          = fattr,
1881                 .server         = server,
1882         };
1883         struct rpc_message msg = {
1884                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1885                 .rpc_argp       = &arg,
1886                 .rpc_resp       = &res,
1887                 .rpc_cred       = cred,
1888         };
1889         unsigned long timestamp = jiffies;
1890         int status;
1891
1892         nfs_fattr_init(fattr);
1893
1894         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1895                 /* Use that stateid */
1896         } else if (state != NULL) {
1897                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1898         } else
1899                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1900
1901         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1902         if (status == 0 && state != NULL)
1903                 renew_lease(server, timestamp);
1904         return status;
1905 }
1906
1907 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1908                            struct nfs_fattr *fattr, struct iattr *sattr,
1909                            struct nfs4_state *state)
1910 {
1911         struct nfs_server *server = NFS_SERVER(inode);
1912         struct nfs4_exception exception = { };
1913         int err;
1914         do {
1915                 err = nfs4_handle_exception(server,
1916                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1917                                 &exception);
1918         } while (exception.retry);
1919         return err;
1920 }
1921
1922 struct nfs4_closedata {
1923         struct inode *inode;
1924         struct nfs4_state *state;
1925         struct nfs_closeargs arg;
1926         struct nfs_closeres res;
1927         struct nfs_fattr fattr;
1928         unsigned long timestamp;
1929         bool roc;
1930         u32 roc_barrier;
1931 };
1932
1933 static void nfs4_free_closedata(void *data)
1934 {
1935         struct nfs4_closedata *calldata = data;
1936         struct nfs4_state_owner *sp = calldata->state->owner;
1937         struct super_block *sb = calldata->state->inode->i_sb;
1938
1939         if (calldata->roc)
1940                 pnfs_roc_release(calldata->state->inode);
1941         nfs4_put_open_state(calldata->state);
1942         nfs_free_seqid(calldata->arg.seqid);
1943         nfs4_put_state_owner(sp);
1944         nfs_sb_deactive(sb);
1945         kfree(calldata);
1946 }
1947
1948 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1949                 fmode_t fmode)
1950 {
1951         spin_lock(&state->owner->so_lock);
1952         if (!(fmode & FMODE_READ))
1953                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1954         if (!(fmode & FMODE_WRITE))
1955                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1956         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1957         spin_unlock(&state->owner->so_lock);
1958 }
1959
1960 static void nfs4_close_done(struct rpc_task *task, void *data)
1961 {
1962         struct nfs4_closedata *calldata = data;
1963         struct nfs4_state *state = calldata->state;
1964         struct nfs_server *server = NFS_SERVER(calldata->inode);
1965
1966         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1967                 return;
1968         /* hmm. we are done with the inode, and in the process of freeing
1969          * the state_owner. we keep this around to process errors
1970          */
1971         switch (task->tk_status) {
1972                 case 0:
1973                         if (calldata->roc)
1974                                 pnfs_roc_set_barrier(state->inode,
1975                                                      calldata->roc_barrier);
1976                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1977                         renew_lease(server, calldata->timestamp);
1978                         nfs4_close_clear_stateid_flags(state,
1979                                         calldata->arg.fmode);
1980                         break;
1981                 case -NFS4ERR_STALE_STATEID:
1982                 case -NFS4ERR_OLD_STATEID:
1983                 case -NFS4ERR_BAD_STATEID:
1984                 case -NFS4ERR_EXPIRED:
1985                         if (calldata->arg.fmode == 0)
1986                                 break;
1987                 default:
1988                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1989                                 rpc_restart_call_prepare(task);
1990         }
1991         nfs_release_seqid(calldata->arg.seqid);
1992         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1993 }
1994
1995 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1996 {
1997         struct nfs4_closedata *calldata = data;
1998         struct nfs4_state *state = calldata->state;
1999         int call_close = 0;
2000
2001         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2002                 return;
2003
2004         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2005         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2006         spin_lock(&state->owner->so_lock);
2007         /* Calculate the change in open mode */
2008         if (state->n_rdwr == 0) {
2009                 if (state->n_rdonly == 0) {
2010                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2011                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2012                         calldata->arg.fmode &= ~FMODE_READ;
2013                 }
2014                 if (state->n_wronly == 0) {
2015                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2016                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2017                         calldata->arg.fmode &= ~FMODE_WRITE;
2018                 }
2019         }
2020         spin_unlock(&state->owner->so_lock);
2021
2022         if (!call_close) {
2023                 /* Note: exit _without_ calling nfs4_close_done */
2024                 task->tk_action = NULL;
2025                 return;
2026         }
2027
2028         if (calldata->arg.fmode == 0) {
2029                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2030                 if (calldata->roc &&
2031                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2032                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2033                                      task, NULL);
2034                         return;
2035                 }
2036         }
2037
2038         nfs_fattr_init(calldata->res.fattr);
2039         calldata->timestamp = jiffies;
2040         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2041                                 &calldata->arg.seq_args,
2042                                 &calldata->res.seq_res,
2043                                 task))
2044                 return;
2045         rpc_call_start(task);
2046 }
2047
2048 static const struct rpc_call_ops nfs4_close_ops = {
2049         .rpc_call_prepare = nfs4_close_prepare,
2050         .rpc_call_done = nfs4_close_done,
2051         .rpc_release = nfs4_free_closedata,
2052 };
2053
2054 /*
2055  * It is possible for data to be read/written from a mem-mapped file
2056  * after the sys_close call (which hits the vfs layer as a flush).
2057  * This means that we can't safely call nfsv4 close on a file until
2058  * the inode is cleared. This in turn means that we are not good
2059  * NFSv4 citizens - we do not indicate to the server to update the file's
2060  * share state even when we are done with one of the three share
2061  * stateid's in the inode.
2062  *
2063  * NOTE: Caller must be holding the sp->so_owner semaphore!
2064  */
2065 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2066 {
2067         struct nfs_server *server = NFS_SERVER(state->inode);
2068         struct nfs4_closedata *calldata;
2069         struct nfs4_state_owner *sp = state->owner;
2070         struct rpc_task *task;
2071         struct rpc_message msg = {
2072                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2073                 .rpc_cred = state->owner->so_cred,
2074         };
2075         struct rpc_task_setup task_setup_data = {
2076                 .rpc_client = server->client,
2077                 .rpc_message = &msg,
2078                 .callback_ops = &nfs4_close_ops,
2079                 .workqueue = nfsiod_workqueue,
2080                 .flags = RPC_TASK_ASYNC,
2081         };
2082         int status = -ENOMEM;
2083
2084         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2085         if (calldata == NULL)
2086                 goto out;
2087         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2088         calldata->inode = state->inode;
2089         calldata->state = state;
2090         calldata->arg.fh = NFS_FH(state->inode);
2091         calldata->arg.stateid = &state->open_stateid;
2092         /* Serialization for the sequence id */
2093         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2094         if (calldata->arg.seqid == NULL)
2095                 goto out_free_calldata;
2096         calldata->arg.fmode = 0;
2097         calldata->arg.bitmask = server->cache_consistency_bitmask;
2098         calldata->res.fattr = &calldata->fattr;
2099         calldata->res.seqid = calldata->arg.seqid;
2100         calldata->res.server = server;
2101         calldata->roc = roc;
2102         nfs_sb_active(calldata->inode->i_sb);
2103
2104         msg.rpc_argp = &calldata->arg;
2105         msg.rpc_resp = &calldata->res;
2106         task_setup_data.callback_data = calldata;
2107         task = rpc_run_task(&task_setup_data);
2108         if (IS_ERR(task))
2109                 return PTR_ERR(task);
2110         status = 0;
2111         if (wait)
2112                 status = rpc_wait_for_completion_task(task);
2113         rpc_put_task(task);
2114         return status;
2115 out_free_calldata:
2116         kfree(calldata);
2117 out:
2118         if (roc)
2119                 pnfs_roc_release(state->inode);
2120         nfs4_put_open_state(state);
2121         nfs4_put_state_owner(sp);
2122         return status;
2123 }
2124
2125 static struct inode *
2126 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2127 {
2128         struct nfs4_state *state;
2129
2130         /* Protect against concurrent sillydeletes */
2131         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2132         if (IS_ERR(state))
2133                 return ERR_CAST(state);
2134         ctx->state = state;
2135         return igrab(state->inode);
2136 }
2137
2138 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2139 {
2140         if (ctx->state == NULL)
2141                 return;
2142         if (is_sync)
2143                 nfs4_close_sync(ctx->state, ctx->mode);
2144         else
2145                 nfs4_close_state(ctx->state, ctx->mode);
2146 }
2147
2148 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2149 {
2150         struct nfs4_server_caps_arg args = {
2151                 .fhandle = fhandle,
2152         };
2153         struct nfs4_server_caps_res res = {};
2154         struct rpc_message msg = {
2155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2156                 .rpc_argp = &args,
2157                 .rpc_resp = &res,
2158         };
2159         int status;
2160
2161         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2162         if (status == 0) {
2163                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2164                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2165                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2166                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2167                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2168                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2169                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2170                         server->caps |= NFS_CAP_ACLS;
2171                 if (res.has_links != 0)
2172                         server->caps |= NFS_CAP_HARDLINKS;
2173                 if (res.has_symlinks != 0)
2174                         server->caps |= NFS_CAP_SYMLINKS;
2175                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2176                         server->caps |= NFS_CAP_FILEID;
2177                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2178                         server->caps |= NFS_CAP_MODE;
2179                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2180                         server->caps |= NFS_CAP_NLINK;
2181                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2182                         server->caps |= NFS_CAP_OWNER;
2183                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2184                         server->caps |= NFS_CAP_OWNER_GROUP;
2185                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2186                         server->caps |= NFS_CAP_ATIME;
2187                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2188                         server->caps |= NFS_CAP_CTIME;
2189                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2190                         server->caps |= NFS_CAP_MTIME;
2191
2192                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2193                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2194                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2195                 server->acl_bitmask = res.acl_bitmask;
2196         }
2197
2198         return status;
2199 }
2200
2201 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2202 {
2203         struct nfs4_exception exception = { };
2204         int err;
2205         do {
2206                 err = nfs4_handle_exception(server,
2207                                 _nfs4_server_capabilities(server, fhandle),
2208                                 &exception);
2209         } while (exception.retry);
2210         return err;
2211 }
2212
2213 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2214                 struct nfs_fsinfo *info)
2215 {
2216         struct nfs4_lookup_root_arg args = {
2217                 .bitmask = nfs4_fattr_bitmap,
2218         };
2219         struct nfs4_lookup_res res = {
2220                 .server = server,
2221                 .fattr = info->fattr,
2222                 .fh = fhandle,
2223         };
2224         struct rpc_message msg = {
2225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2226                 .rpc_argp = &args,
2227                 .rpc_resp = &res,
2228         };
2229
2230         nfs_fattr_init(info->fattr);
2231         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2232 }
2233
2234 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2235                 struct nfs_fsinfo *info)
2236 {
2237         struct nfs4_exception exception = { };
2238         int err;
2239         do {
2240                 err = _nfs4_lookup_root(server, fhandle, info);
2241                 switch (err) {
2242                 case 0:
2243                 case -NFS4ERR_WRONGSEC:
2244                         break;
2245                 default:
2246                         err = nfs4_handle_exception(server, err, &exception);
2247                 }
2248         } while (exception.retry);
2249         return err;
2250 }
2251
2252 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2253                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2254 {
2255         struct rpc_auth *auth;
2256         int ret;
2257
2258         auth = rpcauth_create(flavor, server->client);
2259         if (!auth) {
2260                 ret = -EIO;
2261                 goto out;
2262         }
2263         ret = nfs4_lookup_root(server, fhandle, info);
2264 out:
2265         return ret;
2266 }
2267
2268 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2269                               struct nfs_fsinfo *info)
2270 {
2271         int i, len, status = 0;
2272         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2273
2274         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2275         flav_array[len] = RPC_AUTH_NULL;
2276         len += 1;
2277
2278         for (i = 0; i < len; i++) {
2279                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2280                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2281                         continue;
2282                 break;
2283         }
2284         /*
2285          * -EACCESS could mean that the user doesn't have correct permissions
2286          * to access the mount.  It could also mean that we tried to mount
2287          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2288          * existing mount programs don't handle -EACCES very well so it should
2289          * be mapped to -EPERM instead.
2290          */
2291         if (status == -EACCES)
2292                 status = -EPERM;
2293         return status;
2294 }
2295
2296 /*
2297  * get the file handle for the "/" directory on the server
2298  */
2299 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2300                               struct nfs_fsinfo *info)
2301 {
2302         int minor_version = server->nfs_client->cl_minorversion;
2303         int status = nfs4_lookup_root(server, fhandle, info);
2304         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2305                 /*
2306                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2307                  * by nfs4_map_errors() as this function exits.
2308                  */
2309                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2310         if (status == 0)
2311                 status = nfs4_server_capabilities(server, fhandle);
2312         if (status == 0)
2313                 status = nfs4_do_fsinfo(server, fhandle, info);
2314         return nfs4_map_errors(status);
2315 }
2316
2317 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2318 /*
2319  * Get locations and (maybe) other attributes of a referral.
2320  * Note that we'll actually follow the referral later when
2321  * we detect fsid mismatch in inode revalidation
2322  */
2323 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2324                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2325 {
2326         int status = -ENOMEM;
2327         struct page *page = NULL;
2328         struct nfs4_fs_locations *locations = NULL;
2329
2330         page = alloc_page(GFP_KERNEL);
2331         if (page == NULL)
2332                 goto out;
2333         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2334         if (locations == NULL)
2335                 goto out;
2336
2337         status = nfs4_proc_fs_locations(dir, name, locations, page);
2338         if (status != 0)
2339                 goto out;
2340         /* Make sure server returned a different fsid for the referral */
2341         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2342                 dprintk("%s: server did not return a different fsid for"
2343                         " a referral at %s\n", __func__, name->name);
2344                 status = -EIO;
2345                 goto out;
2346         }
2347         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2348         nfs_fixup_referral_attributes(&locations->fattr);
2349
2350         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2351         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2352         memset(fhandle, 0, sizeof(struct nfs_fh));
2353 out:
2354         if (page)
2355                 __free_page(page);
2356         kfree(locations);
2357         return status;
2358 }
2359
2360 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2361 {
2362         struct nfs4_getattr_arg args = {
2363                 .fh = fhandle,
2364                 .bitmask = server->attr_bitmask,
2365         };
2366         struct nfs4_getattr_res res = {
2367                 .fattr = fattr,
2368                 .server = server,
2369         };
2370         struct rpc_message msg = {
2371                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2372                 .rpc_argp = &args,
2373                 .rpc_resp = &res,
2374         };
2375
2376         nfs_fattr_init(fattr);
2377         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2378 }
2379
2380 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2381 {
2382         struct nfs4_exception exception = { };
2383         int err;
2384         do {
2385                 err = nfs4_handle_exception(server,
2386                                 _nfs4_proc_getattr(server, fhandle, fattr),
2387                                 &exception);
2388         } while (exception.retry);
2389         return err;
2390 }
2391
2392 /*
2393  * The file is not closed if it is opened due to the a request to change
2394  * the size of the file. The open call will not be needed once the
2395  * VFS layer lookup-intents are implemented.
2396  *
2397  * Close is called when the inode is destroyed.
2398  * If we haven't opened the file for O_WRONLY, we
2399  * need to in the size_change case to obtain a stateid.
2400  *
2401  * Got race?
2402  * Because OPEN is always done by name in nfsv4, it is
2403  * possible that we opened a different file by the same
2404  * name.  We can recognize this race condition, but we
2405  * can't do anything about it besides returning an error.
2406  *
2407  * This will be fixed with VFS changes (lookup-intent).
2408  */
2409 static int
2410 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2411                   struct iattr *sattr)
2412 {
2413         struct inode *inode = dentry->d_inode;
2414         struct rpc_cred *cred = NULL;
2415         struct nfs4_state *state = NULL;
2416         int status;
2417
2418         if (pnfs_ld_layoutret_on_setattr(inode))
2419                 pnfs_return_layout(inode);
2420
2421         nfs_fattr_init(fattr);
2422
2423         /* Search for an existing open(O_WRITE) file */
2424         if (sattr->ia_valid & ATTR_FILE) {
2425                 struct nfs_open_context *ctx;
2426
2427                 ctx = nfs_file_open_context(sattr->ia_file);
2428                 if (ctx) {
2429                         cred = ctx->cred;
2430                         state = ctx->state;
2431                 }
2432         }
2433
2434         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2435         if (status == 0)
2436                 nfs_setattr_update_inode(inode, sattr);
2437         return status;
2438 }
2439
2440 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2441                 const struct qstr *name, struct nfs_fh *fhandle,
2442                 struct nfs_fattr *fattr)
2443 {
2444         struct nfs_server *server = NFS_SERVER(dir);
2445         int                    status;
2446         struct nfs4_lookup_arg args = {
2447                 .bitmask = server->attr_bitmask,
2448                 .dir_fh = NFS_FH(dir),
2449                 .name = name,
2450         };
2451         struct nfs4_lookup_res res = {
2452                 .server = server,
2453                 .fattr = fattr,
2454                 .fh = fhandle,
2455         };
2456         struct rpc_message msg = {
2457                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2458                 .rpc_argp = &args,
2459                 .rpc_resp = &res,
2460         };
2461
2462         nfs_fattr_init(fattr);
2463
2464         dprintk("NFS call  lookup %s\n", name->name);
2465         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2466         dprintk("NFS reply lookup: %d\n", status);
2467         return status;
2468 }
2469
2470 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2471 {
2472         memset(fh, 0, sizeof(struct nfs_fh));
2473         fattr->fsid.major = 1;
2474         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2475                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2476         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2477         fattr->nlink = 2;
2478 }
2479
2480 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2481                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2482 {
2483         struct nfs4_exception exception = { };
2484         int err;
2485         do {
2486                 int status;
2487
2488                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2489                 switch (status) {
2490                 case -NFS4ERR_BADNAME:
2491                         return -ENOENT;
2492                 case -NFS4ERR_MOVED:
2493                         return nfs4_get_referral(dir, name, fattr, fhandle);
2494                 case -NFS4ERR_WRONGSEC:
2495                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2496                 }
2497                 err = nfs4_handle_exception(NFS_SERVER(dir),
2498                                 status, &exception);
2499         } while (exception.retry);
2500         return err;
2501 }
2502
2503 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2504 {
2505         struct nfs_server *server = NFS_SERVER(inode);
2506         struct nfs4_accessargs args = {
2507                 .fh = NFS_FH(inode),
2508                 .bitmask = server->attr_bitmask,
2509         };
2510         struct nfs4_accessres res = {
2511                 .server = server,
2512         };
2513         struct rpc_message msg = {
2514                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2515                 .rpc_argp = &args,
2516                 .rpc_resp = &res,
2517                 .rpc_cred = entry->cred,
2518         };
2519         int mode = entry->mask;
2520         int status;
2521
2522         /*
2523          * Determine which access bits we want to ask for...
2524          */
2525         if (mode & MAY_READ)
2526                 args.access |= NFS4_ACCESS_READ;
2527         if (S_ISDIR(inode->i_mode)) {
2528                 if (mode & MAY_WRITE)
2529                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2530                 if (mode & MAY_EXEC)
2531                         args.access |= NFS4_ACCESS_LOOKUP;
2532         } else {
2533                 if (mode & MAY_WRITE)
2534                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2535                 if (mode & MAY_EXEC)
2536                         args.access |= NFS4_ACCESS_EXECUTE;
2537         }
2538
2539         res.fattr = nfs_alloc_fattr();
2540         if (res.fattr == NULL)
2541                 return -ENOMEM;
2542
2543         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2544         if (!status) {
2545                 entry->mask = 0;
2546                 if (res.access & NFS4_ACCESS_READ)
2547                         entry->mask |= MAY_READ;
2548                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2549                         entry->mask |= MAY_WRITE;
2550                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2551                         entry->mask |= MAY_EXEC;
2552                 nfs_refresh_inode(inode, res.fattr);
2553         }
2554         nfs_free_fattr(res.fattr);
2555         return status;
2556 }
2557
2558 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2559 {
2560         struct nfs4_exception exception = { };
2561         int err;
2562         do {
2563                 err = nfs4_handle_exception(NFS_SERVER(inode),
2564                                 _nfs4_proc_access(inode, entry),
2565                                 &exception);
2566         } while (exception.retry);
2567         return err;
2568 }
2569
2570 /*
2571  * TODO: For the time being, we don't try to get any attributes
2572  * along with any of the zero-copy operations READ, READDIR,
2573  * READLINK, WRITE.
2574  *
2575  * In the case of the first three, we want to put the GETATTR
2576  * after the read-type operation -- this is because it is hard
2577  * to predict the length of a GETATTR response in v4, and thus
2578  * align the READ data correctly.  This means that the GETATTR
2579  * may end up partially falling into the page cache, and we should
2580  * shift it into the 'tail' of the xdr_buf before processing.
2581  * To do this efficiently, we need to know the total length
2582  * of data received, which doesn't seem to be available outside
2583  * of the RPC layer.
2584  *
2585  * In the case of WRITE, we also want to put the GETATTR after
2586  * the operation -- in this case because we want to make sure
2587  * we get the post-operation mtime and size.  This means that
2588  * we can't use xdr_encode_pages() as written: we need a variant
2589  * of it which would leave room in the 'tail' iovec.
2590  *
2591  * Both of these changes to the XDR layer would in fact be quite
2592  * minor, but I decided to leave them for a subsequent patch.
2593  */
2594 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2595                 unsigned int pgbase, unsigned int pglen)
2596 {
2597         struct nfs4_readlink args = {
2598                 .fh       = NFS_FH(inode),
2599                 .pgbase   = pgbase,
2600                 .pglen    = pglen,
2601                 .pages    = &page,
2602         };
2603         struct nfs4_readlink_res res;
2604         struct rpc_message msg = {
2605                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2606                 .rpc_argp = &args,
2607                 .rpc_resp = &res,
2608         };
2609
2610         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2611 }
2612
2613 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2614                 unsigned int pgbase, unsigned int pglen)
2615 {
2616         struct nfs4_exception exception = { };
2617         int err;
2618         do {
2619                 err = nfs4_handle_exception(NFS_SERVER(inode),
2620                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2621                                 &exception);
2622         } while (exception.retry);
2623         return err;
2624 }
2625
2626 /*
2627  * Got race?
2628  * We will need to arrange for the VFS layer to provide an atomic open.
2629  * Until then, this create/open method is prone to inefficiency and race
2630  * conditions due to the lookup, create, and open VFS calls from sys_open()
2631  * placed on the wire.
2632  *
2633  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2634  * The file will be opened again in the subsequent VFS open call
2635  * (nfs4_proc_file_open).
2636  *
2637  * The open for read will just hang around to be used by any process that
2638  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2639  */
2640
2641 static int
2642 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2643                  int flags, struct nfs_open_context *ctx)
2644 {
2645         struct dentry *de = dentry;
2646         struct nfs4_state *state;
2647         struct rpc_cred *cred = NULL;
2648         fmode_t fmode = 0;
2649         int status = 0;
2650
2651         if (ctx != NULL) {
2652                 cred = ctx->cred;
2653                 de = ctx->dentry;
2654                 fmode = ctx->mode;
2655         }
2656         sattr->ia_mode &= ~current_umask();
2657         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2658         d_drop(dentry);
2659         if (IS_ERR(state)) {
2660                 status = PTR_ERR(state);
2661                 goto out;
2662         }
2663         d_add(dentry, igrab(state->inode));
2664         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2665         if (ctx != NULL)
2666                 ctx->state = state;
2667         else
2668                 nfs4_close_sync(state, fmode);
2669 out:
2670         return status;
2671 }
2672
2673 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2674 {
2675         struct nfs_server *server = NFS_SERVER(dir);
2676         struct nfs_removeargs args = {
2677                 .fh = NFS_FH(dir),
2678                 .name.len = name->len,
2679                 .name.name = name->name,
2680                 .bitmask = server->attr_bitmask,
2681         };
2682         struct nfs_removeres res = {
2683                 .server = server,
2684         };
2685         struct rpc_message msg = {
2686                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2687                 .rpc_argp = &args,
2688                 .rpc_resp = &res,
2689         };
2690         int status = -ENOMEM;
2691
2692         res.dir_attr = nfs_alloc_fattr();
2693         if (res.dir_attr == NULL)
2694                 goto out;
2695
2696         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2697         if (status == 0) {
2698                 update_changeattr(dir, &res.cinfo);
2699                 nfs_post_op_update_inode(dir, res.dir_attr);
2700         }
2701         nfs_free_fattr(res.dir_attr);
2702 out:
2703         return status;
2704 }
2705
2706 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2707 {
2708         struct nfs4_exception exception = { };
2709         int err;
2710         do {
2711                 err = nfs4_handle_exception(NFS_SERVER(dir),
2712                                 _nfs4_proc_remove(dir, name),
2713                                 &exception);
2714         } while (exception.retry);
2715         return err;
2716 }
2717
2718 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2719 {
2720         struct nfs_server *server = NFS_SERVER(dir);
2721         struct nfs_removeargs *args = msg->rpc_argp;
2722         struct nfs_removeres *res = msg->rpc_resp;
2723
2724         args->bitmask = server->cache_consistency_bitmask;
2725         res->server = server;
2726         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2727         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2728 }
2729
2730 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2731 {
2732         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2733
2734         if (!nfs4_sequence_done(task, &res->seq_res))
2735                 return 0;
2736         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2737                 return 0;
2738         update_changeattr(dir, &res->cinfo);
2739         nfs_post_op_update_inode(dir, res->dir_attr);
2740         return 1;
2741 }
2742
2743 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2744 {
2745         struct nfs_server *server = NFS_SERVER(dir);
2746         struct nfs_renameargs *arg = msg->rpc_argp;
2747         struct nfs_renameres *res = msg->rpc_resp;
2748
2749         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2750         arg->bitmask = server->attr_bitmask;
2751         res->server = server;
2752         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2753 }
2754
2755 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2756                                  struct inode *new_dir)
2757 {
2758         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2759
2760         if (!nfs4_sequence_done(task, &res->seq_res))
2761                 return 0;
2762         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2763                 return 0;
2764
2765         update_changeattr(old_dir, &res->old_cinfo);
2766         nfs_post_op_update_inode(old_dir, res->old_fattr);
2767         update_changeattr(new_dir, &res->new_cinfo);
2768         nfs_post_op_update_inode(new_dir, res->new_fattr);
2769         return 1;
2770 }
2771
2772 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2773                 struct inode *new_dir, struct qstr *new_name)
2774 {
2775         struct nfs_server *server = NFS_SERVER(old_dir);
2776         struct nfs_renameargs arg = {
2777                 .old_dir = NFS_FH(old_dir),
2778                 .new_dir = NFS_FH(new_dir),
2779                 .old_name = old_name,
2780                 .new_name = new_name,
2781                 .bitmask = server->attr_bitmask,
2782         };
2783         struct nfs_renameres res = {
2784                 .server = server,
2785         };
2786         struct rpc_message msg = {
2787                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2788                 .rpc_argp = &arg,
2789                 .rpc_resp = &res,
2790         };
2791         int status = -ENOMEM;
2792
2793         res.old_fattr = nfs_alloc_fattr();
2794         res.new_fattr = nfs_alloc_fattr();
2795         if (res.old_fattr == NULL || res.new_fattr == NULL)
2796                 goto out;
2797
2798         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2799         if (!status) {
2800                 update_changeattr(old_dir, &res.old_cinfo);
2801                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2802                 update_changeattr(new_dir, &res.new_cinfo);
2803                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2804         }
2805 out:
2806         nfs_free_fattr(res.new_fattr);
2807         nfs_free_fattr(res.old_fattr);
2808         return status;
2809 }
2810
2811 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2812                 struct inode *new_dir, struct qstr *new_name)
2813 {
2814         struct nfs4_exception exception = { };
2815         int err;
2816         do {
2817                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2818                                 _nfs4_proc_rename(old_dir, old_name,
2819                                         new_dir, new_name),
2820                                 &exception);
2821         } while (exception.retry);
2822         return err;
2823 }
2824
2825 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2826 {
2827         struct nfs_server *server = NFS_SERVER(inode);
2828         struct nfs4_link_arg arg = {
2829                 .fh     = NFS_FH(inode),
2830                 .dir_fh = NFS_FH(dir),
2831                 .name   = name,
2832                 .bitmask = server->attr_bitmask,
2833         };
2834         struct nfs4_link_res res = {
2835                 .server = server,
2836         };
2837         struct rpc_message msg = {
2838                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2839                 .rpc_argp = &arg,
2840                 .rpc_resp = &res,
2841         };
2842         int status = -ENOMEM;
2843
2844         res.fattr = nfs_alloc_fattr();
2845         res.dir_attr = nfs_alloc_fattr();
2846         if (res.fattr == NULL || res.dir_attr == NULL)
2847                 goto out;
2848
2849         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2850         if (!status) {
2851                 update_changeattr(dir, &res.cinfo);
2852                 nfs_post_op_update_inode(dir, res.dir_attr);
2853                 nfs_post_op_update_inode(inode, res.fattr);
2854         }
2855 out:
2856         nfs_free_fattr(res.dir_attr);
2857         nfs_free_fattr(res.fattr);
2858         return status;
2859 }
2860
2861 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2862 {
2863         struct nfs4_exception exception = { };
2864         int err;
2865         do {
2866                 err = nfs4_handle_exception(NFS_SERVER(inode),
2867                                 _nfs4_proc_link(inode, dir, name),
2868                                 &exception);
2869         } while (exception.retry);
2870         return err;
2871 }
2872
2873 struct nfs4_createdata {
2874         struct rpc_message msg;
2875         struct nfs4_create_arg arg;
2876         struct nfs4_create_res res;
2877         struct nfs_fh fh;
2878         struct nfs_fattr fattr;
2879         struct nfs_fattr dir_fattr;
2880 };
2881
2882 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2883                 struct qstr *name, struct iattr *sattr, u32 ftype)
2884 {
2885         struct nfs4_createdata *data;
2886
2887         data = kzalloc(sizeof(*data), GFP_KERNEL);
2888         if (data != NULL) {
2889                 struct nfs_server *server = NFS_SERVER(dir);
2890
2891                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2892                 data->msg.rpc_argp = &data->arg;
2893                 data->msg.rpc_resp = &data->res;
2894                 data->arg.dir_fh = NFS_FH(dir);
2895                 data->arg.server = server;
2896                 data->arg.name = name;
2897                 data->arg.attrs = sattr;
2898                 data->arg.ftype = ftype;
2899                 data->arg.bitmask = server->attr_bitmask;
2900                 data->res.server = server;
2901                 data->res.fh = &data->fh;
2902                 data->res.fattr = &data->fattr;
2903                 data->res.dir_fattr = &data->dir_fattr;
2904                 nfs_fattr_init(data->res.fattr);
2905                 nfs_fattr_init(data->res.dir_fattr);
2906         }
2907         return data;
2908 }
2909
2910 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2911 {
2912         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2913                                     &data->arg.seq_args, &data->res.seq_res, 1);
2914         if (status == 0) {
2915                 update_changeattr(dir, &data->res.dir_cinfo);
2916                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2917                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2918         }
2919         return status;
2920 }
2921
2922 static void nfs4_free_createdata(struct nfs4_createdata *data)
2923 {
2924         kfree(data);
2925 }
2926
2927 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2928                 struct page *page, unsigned int len, struct iattr *sattr)
2929 {
2930         struct nfs4_createdata *data;
2931         int status = -ENAMETOOLONG;
2932
2933         if (len > NFS4_MAXPATHLEN)
2934                 goto out;
2935
2936         status = -ENOMEM;
2937         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2938         if (data == NULL)
2939                 goto out;
2940
2941         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2942         data->arg.u.symlink.pages = &page;
2943         data->arg.u.symlink.len = len;
2944
2945         status = nfs4_do_create(dir, dentry, data);
2946
2947         nfs4_free_createdata(data);
2948 out:
2949         return status;
2950 }
2951
2952 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2953                 struct page *page, unsigned int len, struct iattr *sattr)
2954 {
2955         struct nfs4_exception exception = { };
2956         int err;
2957         do {
2958                 err = nfs4_handle_exception(NFS_SERVER(dir),
2959                                 _nfs4_proc_symlink(dir, dentry, page,
2960                                                         len, sattr),
2961                                 &exception);
2962         } while (exception.retry);
2963         return err;
2964 }
2965
2966 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2967                 struct iattr *sattr)
2968 {
2969         struct nfs4_createdata *data;
2970         int status = -ENOMEM;
2971
2972         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2973         if (data == NULL)
2974                 goto out;
2975
2976         status = nfs4_do_create(dir, dentry, data);
2977
2978         nfs4_free_createdata(data);
2979 out:
2980         return status;
2981 }
2982
2983 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2984                 struct iattr *sattr)
2985 {
2986         struct nfs4_exception exception = { };
2987         int err;
2988
2989         sattr->ia_mode &= ~current_umask();
2990         do {
2991                 err = nfs4_handle_exception(NFS_SERVER(dir),
2992                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2993                                 &exception);
2994         } while (exception.retry);
2995         return err;
2996 }
2997
2998 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2999                 u64 cookie, struct page **pages, unsigned int count, int plus)
3000 {
3001         struct inode            *dir = dentry->d_inode;
3002         struct nfs4_readdir_arg args = {
3003                 .fh = NFS_FH(dir),
3004                 .pages = pages,
3005                 .pgbase = 0,
3006                 .count = count,
3007                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3008                 .plus = plus,
3009         };
3010         struct nfs4_readdir_res res;
3011         struct rpc_message msg = {
3012                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3013                 .rpc_argp = &args,
3014                 .rpc_resp = &res,
3015                 .rpc_cred = cred,
3016         };
3017         int                     status;
3018
3019         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3020                         dentry->d_parent->d_name.name,
3021                         dentry->d_name.name,
3022                         (unsigned long long)cookie);
3023         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3024         res.pgbase = args.pgbase;
3025         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3026         if (status >= 0) {
3027                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3028                 status += args.pgbase;
3029         }
3030
3031         nfs_invalidate_atime(dir);
3032
3033         dprintk("%s: returns %d\n", __func__, status);
3034         return status;
3035 }
3036
3037 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3038                 u64 cookie, struct page **pages, unsigned int count, int plus)
3039 {
3040         struct nfs4_exception exception = { };
3041         int err;
3042         do {
3043                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3044                                 _nfs4_proc_readdir(dentry, cred, cookie,
3045                                         pages, count, plus),
3046                                 &exception);
3047         } while (exception.retry);
3048         return err;
3049 }
3050
3051 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3052                 struct iattr *sattr, dev_t rdev)
3053 {
3054         struct nfs4_createdata *data;
3055         int mode = sattr->ia_mode;
3056         int status = -ENOMEM;
3057
3058         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3059         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3060
3061         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3062         if (data == NULL)
3063                 goto out;
3064
3065         if (S_ISFIFO(mode))
3066                 data->arg.ftype = NF4FIFO;
3067         else if (S_ISBLK(mode)) {
3068                 data->arg.ftype = NF4BLK;
3069                 data->arg.u.device.specdata1 = MAJOR(rdev);
3070                 data->arg.u.device.specdata2 = MINOR(rdev);
3071         }
3072         else if (S_ISCHR(mode)) {
3073                 data->arg.ftype = NF4CHR;
3074                 data->arg.u.device.specdata1 = MAJOR(rdev);
3075                 data->arg.u.device.specdata2 = MINOR(rdev);
3076         }
3077
3078         status = nfs4_do_create(dir, dentry, data);
3079
3080         nfs4_free_createdata(data);
3081 out:
3082         return status;
3083 }
3084
3085 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3086                 struct iattr *sattr, dev_t rdev)
3087 {
3088         struct nfs4_exception exception = { };
3089         int err;
3090
3091         sattr->ia_mode &= ~current_umask();
3092         do {
3093                 err = nfs4_handle_exception(NFS_SERVER(dir),
3094                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3095                                 &exception);
3096         } while (exception.retry);
3097         return err;
3098 }
3099
3100 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3101                  struct nfs_fsstat *fsstat)
3102 {
3103         struct nfs4_statfs_arg args = {
3104                 .fh = fhandle,
3105                 .bitmask = server->attr_bitmask,
3106         };
3107         struct nfs4_statfs_res res = {
3108                 .fsstat = fsstat,
3109         };
3110         struct rpc_message msg = {
3111                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3112                 .rpc_argp = &args,
3113                 .rpc_resp = &res,
3114         };
3115
3116         nfs_fattr_init(fsstat->fattr);
3117         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3118 }
3119
3120 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3121 {
3122         struct nfs4_exception exception = { };
3123         int err;
3124         do {
3125                 err = nfs4_handle_exception(server,
3126                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3127                                 &exception);
3128         } while (exception.retry);
3129         return err;
3130 }
3131
3132 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3133                 struct nfs_fsinfo *fsinfo)
3134 {
3135         struct nfs4_fsinfo_arg args = {
3136                 .fh = fhandle,
3137                 .bitmask = server->attr_bitmask,
3138         };
3139         struct nfs4_fsinfo_res res = {
3140                 .fsinfo = fsinfo,
3141         };
3142         struct rpc_message msg = {
3143                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3144                 .rpc_argp = &args,
3145                 .rpc_resp = &res,
3146         };
3147
3148         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3149 }
3150
3151 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3152 {
3153         struct nfs4_exception exception = { };
3154         int err;
3155
3156         do {
3157                 err = nfs4_handle_exception(server,
3158                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3159                                 &exception);
3160         } while (exception.retry);
3161         return err;
3162 }
3163
3164 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3165 {
3166         nfs_fattr_init(fsinfo->fattr);
3167         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3168 }
3169
3170 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3171                 struct nfs_pathconf *pathconf)
3172 {
3173         struct nfs4_pathconf_arg args = {
3174                 .fh = fhandle,
3175                 .bitmask = server->attr_bitmask,
3176         };
3177         struct nfs4_pathconf_res res = {
3178                 .pathconf = pathconf,
3179         };
3180         struct rpc_message msg = {
3181                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3182                 .rpc_argp = &args,
3183                 .rpc_resp = &res,
3184         };
3185
3186         /* None of the pathconf attributes are mandatory to implement */
3187         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3188                 memset(pathconf, 0, sizeof(*pathconf));
3189                 return 0;
3190         }
3191
3192         nfs_fattr_init(pathconf->fattr);
3193         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3194 }
3195
3196 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3197                 struct nfs_pathconf *pathconf)
3198 {
3199         struct nfs4_exception exception = { };
3200         int err;
3201
3202         do {
3203                 err = nfs4_handle_exception(server,
3204                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3205                                 &exception);
3206         } while (exception.retry);
3207         return err;
3208 }
3209
3210 void __nfs4_read_done_cb(struct nfs_read_data *data)
3211 {
3212         nfs_invalidate_atime(data->inode);
3213 }
3214
3215 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3216 {
3217         struct nfs_server *server = NFS_SERVER(data->inode);
3218
3219         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3220                 rpc_restart_call_prepare(task);
3221                 return -EAGAIN;
3222         }
3223
3224         __nfs4_read_done_cb(data);
3225         if (task->tk_status > 0)
3226                 renew_lease(server, data->timestamp);
3227         return 0;
3228 }
3229
3230 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3231 {
3232
3233         dprintk("--> %s\n", __func__);
3234
3235         if (!nfs4_sequence_done(task, &data->res.seq_res))
3236                 return -EAGAIN;
3237
3238         return data->read_done_cb ? data->read_done_cb(task, data) :
3239                                     nfs4_read_done_cb(task, data);
3240 }
3241
3242 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3243 {
3244         data->timestamp   = jiffies;
3245         data->read_done_cb = nfs4_read_done_cb;
3246         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3247         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3248 }
3249
3250 /* Reset the the nfs_read_data to send the read to the MDS. */
3251 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3252 {
3253         dprintk("%s Reset task for i/o through\n", __func__);
3254         put_lseg(data->lseg);
3255         data->lseg = NULL;
3256         /* offsets will differ in the dense stripe case */
3257         data->args.offset = data->mds_offset;
3258         data->ds_clp = NULL;
3259         data->args.fh     = NFS_FH(data->inode);
3260         data->read_done_cb = nfs4_read_done_cb;
3261         task->tk_ops = data->mds_ops;
3262         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3263 }
3264 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3265
3266 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3267 {
3268         struct inode *inode = data->inode;
3269
3270         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3271                 rpc_restart_call_prepare(task);
3272                 return -EAGAIN;
3273         }
3274         if (task->tk_status >= 0) {
3275                 renew_lease(NFS_SERVER(inode), data->timestamp);
3276                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3277         }
3278         return 0;
3279 }
3280
3281 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3282 {
3283         if (!nfs4_sequence_done(task, &data->res.seq_res))
3284                 return -EAGAIN;
3285         return data->write_done_cb ? data->write_done_cb(task, data) :
3286                 nfs4_write_done_cb(task, data);
3287 }
3288
3289 /* Reset the the nfs_write_data to send the write to the MDS. */
3290 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3291 {
3292         dprintk("%s Reset task for i/o through\n", __func__);
3293         put_lseg(data->lseg);
3294         data->lseg          = NULL;
3295         data->ds_clp        = NULL;
3296         data->write_done_cb = nfs4_write_done_cb;
3297         data->args.fh       = NFS_FH(data->inode);
3298         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3299         data->args.offset   = data->mds_offset;
3300         data->res.fattr     = &data->fattr;
3301         task->tk_ops        = data->mds_ops;
3302         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3303 }
3304 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3305
3306 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3307 {
3308         struct nfs_server *server = NFS_SERVER(data->inode);
3309
3310         if (data->lseg) {
3311                 data->args.bitmask = NULL;
3312                 data->res.fattr = NULL;
3313         } else
3314                 data->args.bitmask = server->cache_consistency_bitmask;
3315         if (!data->write_done_cb)
3316                 data->write_done_cb = nfs4_write_done_cb;
3317         data->res.server = server;
3318         data->timestamp   = jiffies;
3319
3320         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3321         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3322 }
3323
3324 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3325 {
3326         struct inode *inode = data->inode;
3327
3328         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3329                 rpc_restart_call_prepare(task);
3330                 return -EAGAIN;
3331         }
3332         nfs_refresh_inode(inode, data->res.fattr);
3333         return 0;
3334 }
3335
3336 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3337 {
3338         if (!nfs4_sequence_done(task, &data->res.seq_res))
3339                 return -EAGAIN;
3340         return data->write_done_cb(task, data);
3341 }
3342
3343 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3344 {
3345         struct nfs_server *server = NFS_SERVER(data->inode);
3346
3347         if (data->lseg) {
3348                 data->args.bitmask = NULL;
3349                 data->res.fattr = NULL;
3350         } else
3351                 data->args.bitmask = server->cache_consistency_bitmask;
3352         if (!data->write_done_cb)
3353                 data->write_done_cb = nfs4_commit_done_cb;
3354         data->res.server = server;
3355         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3356         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3357 }
3358
3359 struct nfs4_renewdata {
3360         struct nfs_client       *client;
3361         unsigned long           timestamp;
3362 };
3363
3364 /*
3365  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3366  * standalone procedure for queueing an asynchronous RENEW.
3367  */
3368 static void nfs4_renew_release(void *calldata)
3369 {
3370         struct nfs4_renewdata *data = calldata;
3371         struct nfs_client *clp = data->client;
3372
3373         if (atomic_read(&clp->cl_count) > 1)
3374                 nfs4_schedule_state_renewal(clp);
3375         nfs_put_client(clp);
3376         kfree(data);
3377 }
3378
3379 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3380 {
3381         struct nfs4_renewdata *data = calldata;
3382         struct nfs_client *clp = data->client;
3383         unsigned long timestamp = data->timestamp;
3384
3385         if (task->tk_status < 0) {
3386                 /* Unless we're shutting down, schedule state recovery! */
3387                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3388                         return;
3389                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3390                         nfs4_schedule_lease_recovery(clp);
3391                         return;
3392                 }
3393                 nfs4_schedule_path_down_recovery(clp);
3394         }
3395         do_renew_lease(clp, timestamp);
3396 }
3397
3398 static const struct rpc_call_ops nfs4_renew_ops = {
3399         .rpc_call_done = nfs4_renew_done,
3400         .rpc_release = nfs4_renew_release,
3401 };
3402
3403 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3404 {
3405         struct rpc_message msg = {
3406                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3407                 .rpc_argp       = clp,
3408                 .rpc_cred       = cred,
3409         };
3410         struct nfs4_renewdata *data;
3411
3412         if (renew_flags == 0)
3413                 return 0;
3414         if (!atomic_inc_not_zero(&clp->cl_count))
3415                 return -EIO;
3416         data = kmalloc(sizeof(*data), GFP_NOFS);
3417         if (data == NULL)
3418                 return -ENOMEM;
3419         data->client = clp;
3420         data->timestamp = jiffies;
3421         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3422                         &nfs4_renew_ops, data);
3423 }
3424
3425 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3426 {
3427         struct rpc_message msg = {
3428                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3429                 .rpc_argp       = clp,
3430                 .rpc_cred       = cred,
3431         };
3432         unsigned long now = jiffies;
3433         int status;
3434
3435         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3436         if (status < 0)
3437                 return status;
3438         do_renew_lease(clp, now);
3439         return 0;
3440 }
3441
3442 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3443 {
3444         return (server->caps & NFS_CAP_ACLS)
3445                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3446                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3447 }
3448
3449 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3450  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3451  * the stack.
3452  */
3453 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3454
3455 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3456                 struct page **pages, unsigned int *pgbase)
3457 {
3458         struct page *newpage, **spages;
3459         int rc = 0;
3460         size_t len;
3461         spages = pages;
3462
3463         do {
3464                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3465                 newpage = alloc_page(GFP_KERNEL);
3466
3467                 if (newpage == NULL)
3468                         goto unwind;
3469                 memcpy(page_address(newpage), buf, len);
3470                 buf += len;
3471                 buflen -= len;
3472                 *pages++ = newpage;
3473                 rc++;
3474         } while (buflen != 0);
3475
3476         return rc;
3477
3478 unwind:
3479         for(; rc > 0; rc--)
3480                 __free_page(spages[rc-1]);
3481         return -ENOMEM;
3482 }
3483
3484 struct nfs4_cached_acl {
3485         int cached;
3486         size_t len;
3487         char data[0];
3488 };
3489
3490 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3491 {
3492         struct nfs_inode *nfsi = NFS_I(inode);
3493
3494         spin_lock(&inode->i_lock);
3495         kfree(nfsi->nfs4_acl);
3496         nfsi->nfs4_acl = acl;
3497         spin_unlock(&inode->i_lock);
3498 }
3499
3500 static void nfs4_zap_acl_attr(struct inode *inode)
3501 {
3502         nfs4_set_cached_acl(inode, NULL);
3503 }
3504
3505 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3506 {
3507         struct nfs_inode *nfsi = NFS_I(inode);
3508         struct nfs4_cached_acl *acl;
3509         int ret = -ENOENT;
3510
3511         spin_lock(&inode->i_lock);
3512         acl = nfsi->nfs4_acl;
3513         if (acl == NULL)
3514                 goto out;
3515         if (buf == NULL) /* user is just asking for length */
3516                 goto out_len;
3517         if (acl->cached == 0)
3518                 goto out;
3519         ret = -ERANGE; /* see getxattr(2) man page */
3520         if (acl->len > buflen)
3521                 goto out;
3522         memcpy(buf, acl->data, acl->len);
3523 out_len:
3524         ret = acl->len;
3525 out:
3526         spin_unlock(&inode->i_lock);
3527         return ret;
3528 }
3529
3530 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3531 {
3532         struct nfs4_cached_acl *acl;
3533
3534         if (buf && acl_len <= PAGE_SIZE) {
3535                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3536                 if (acl == NULL)
3537                         goto out;
3538                 acl->cached = 1;
3539                 memcpy(acl->data, buf, acl_len);
3540         } else {
3541                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3542                 if (acl == NULL)
3543                         goto out;
3544                 acl->cached = 0;
3545         }
3546         acl->len = acl_len;
3547 out:
3548         nfs4_set_cached_acl(inode, acl);
3549 }
3550
3551 /*
3552  * The getxattr API returns the required buffer length when called with a
3553  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3554  * the required buf.  On a NULL buf, we send a page of data to the server
3555  * guessing that the ACL request can be serviced by a page. If so, we cache
3556  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3557  * the cache. If not so, we throw away the page, and cache the required
3558  * length. The next getxattr call will then produce another round trip to
3559  * the server, this time with the input buf of the required size.
3560  */
3561 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3562 {
3563         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3564         struct nfs_getaclargs args = {
3565                 .fh = NFS_FH(inode),
3566                 .acl_pages = pages,
3567                 .acl_len = buflen,
3568         };
3569         struct nfs_getaclres res = {
3570                 .acl_len = buflen,
3571         };
3572         void *resp_buf;
3573         struct rpc_message msg = {
3574                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3575                 .rpc_argp = &args,
3576                 .rpc_resp = &res,
3577         };
3578         int ret = -ENOMEM, npages, i, acl_len = 0;
3579
3580         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3581         /* As long as we're doing a round trip to the server anyway,
3582          * let's be prepared for a page of acl data. */
3583         if (npages == 0)
3584                 npages = 1;
3585
3586         for (i = 0; i < npages; i++) {
3587                 pages[i] = alloc_page(GFP_KERNEL);
3588                 if (!pages[i])
3589                         goto out_free;
3590         }
3591         if (npages > 1) {
3592                 /* for decoding across pages */
3593                 args.acl_scratch = alloc_page(GFP_KERNEL);
3594                 if (!args.acl_scratch)
3595                         goto out_free;
3596         }
3597         args.acl_len = npages * PAGE_SIZE;
3598         args.acl_pgbase = 0;
3599         /* Let decode_getfacl know not to fail if the ACL data is larger than
3600          * the page we send as a guess */
3601         if (buf == NULL)
3602                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3603         resp_buf = page_address(pages[0]);
3604
3605         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3606                 __func__, buf, buflen, npages, args.acl_len);
3607         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3608                              &msg, &args.seq_args, &res.seq_res, 0);
3609         if (ret)
3610                 goto out_free;
3611
3612         acl_len = res.acl_len - res.acl_data_offset;
3613         if (acl_len > args.acl_len)
3614                 nfs4_write_cached_acl(inode, NULL, acl_len);
3615         else
3616                 nfs4_write_cached_acl(inode, resp_buf + res.acl_data_offset,
3617                                       acl_len);
3618         if (buf) {
3619                 ret = -ERANGE;
3620                 if (acl_len > buflen)
3621                         goto out_free;
3622                 _copy_from_pages(buf, pages, res.acl_data_offset,
3623                                 res.acl_len);
3624         }
3625         ret = acl_len;
3626 out_free:
3627         for (i = 0; i < npages; i++)
3628                 if (pages[i])
3629                         __free_page(pages[i]);
3630         if (args.acl_scratch)
3631                 __free_page(args.acl_scratch);
3632         return ret;
3633 }
3634
3635 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3636 {
3637         struct nfs4_exception exception = { };
3638         ssize_t ret;
3639         do {
3640                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3641                 if (ret >= 0)
3642                         break;
3643                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3644         } while (exception.retry);
3645         return ret;
3646 }
3647
3648 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3649 {
3650         struct nfs_server *server = NFS_SERVER(inode);
3651         int ret;
3652
3653         if (!nfs4_server_supports_acls(server))
3654                 return -EOPNOTSUPP;
3655         ret = nfs_revalidate_inode(server, inode);
3656         if (ret < 0)
3657                 return ret;
3658         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3659                 nfs_zap_acl_cache(inode);
3660         ret = nfs4_read_cached_acl(inode, buf, buflen);
3661         if (ret != -ENOENT)
3662                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3663                  * but no cached acl data, just the acl length */
3664                 return ret;
3665         return nfs4_get_acl_uncached(inode, buf, buflen);
3666 }
3667
3668 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3669 {
3670         struct nfs_server *server = NFS_SERVER(inode);
3671         struct page *pages[NFS4ACL_MAXPAGES];
3672         struct nfs_setaclargs arg = {
3673                 .fh             = NFS_FH(inode),
3674                 .acl_pages      = pages,
3675                 .acl_len        = buflen,
3676         };
3677         struct nfs_setaclres res;
3678         struct rpc_message msg = {
3679                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3680                 .rpc_argp       = &arg,
3681                 .rpc_resp       = &res,
3682         };
3683         int ret, i;
3684
3685         if (!nfs4_server_supports_acls(server))
3686                 return -EOPNOTSUPP;
3687         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3688         if (i < 0)
3689                 return i;
3690         nfs_inode_return_delegation(inode);
3691         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3692
3693         /*
3694          * Free each page after tx, so the only ref left is
3695          * held by the network stack
3696          */
3697         for (; i > 0; i--)
3698                 put_page(pages[i-1]);
3699
3700         /*
3701          * Acl update can result in inode attribute update.
3702          * so mark the attribute cache invalid.
3703          */
3704         spin_lock(&inode->i_lock);
3705         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3706         spin_unlock(&inode->i_lock);
3707         nfs_access_zap_cache(inode);
3708         nfs_zap_acl_cache(inode);
3709         return ret;
3710 }
3711
3712 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3713 {
3714         struct nfs4_exception exception = { };
3715         int err;
3716         do {
3717                 err = nfs4_handle_exception(NFS_SERVER(inode),
3718                                 __nfs4_proc_set_acl(inode, buf, buflen),
3719                                 &exception);
3720         } while (exception.retry);
3721         return err;
3722 }
3723
3724 static int
3725 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3726 {
3727         struct nfs_client *clp = server->nfs_client;
3728
3729         if (task->tk_status >= 0)
3730                 return 0;
3731         switch(task->tk_status) {
3732                 case -NFS4ERR_ADMIN_REVOKED:
3733                 case -NFS4ERR_BAD_STATEID:
3734                 case -NFS4ERR_OPENMODE:
3735                         if (state == NULL)
3736                                 break;
3737                         nfs4_schedule_stateid_recovery(server, state);
3738                         goto wait_on_recovery;
3739                 case -NFS4ERR_EXPIRED:
3740                         if (state != NULL)
3741                                 nfs4_schedule_stateid_recovery(server, state);
3742                 case -NFS4ERR_STALE_STATEID:
3743                 case -NFS4ERR_STALE_CLIENTID:
3744                         nfs4_schedule_lease_recovery(clp);
3745                         goto wait_on_recovery;
3746 #if defined(CONFIG_NFS_V4_1)
3747                 case -NFS4ERR_BADSESSION:
3748                 case -NFS4ERR_BADSLOT:
3749                 case -NFS4ERR_BAD_HIGH_SLOT:
3750                 case -NFS4ERR_DEADSESSION:
3751                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3752                 case -NFS4ERR_SEQ_FALSE_RETRY:
3753                 case -NFS4ERR_SEQ_MISORDERED:
3754                         dprintk("%s ERROR %d, Reset session\n", __func__,
3755                                 task->tk_status);
3756                         nfs4_schedule_session_recovery(clp->cl_session);
3757                         task->tk_status = 0;
3758                         return -EAGAIN;
3759 #endif /* CONFIG_NFS_V4_1 */
3760                 case -NFS4ERR_DELAY:
3761                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3762                 case -NFS4ERR_GRACE:
3763                 case -EKEYEXPIRED:
3764                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3765                         task->tk_status = 0;
3766                         return -EAGAIN;
3767                 case -NFS4ERR_RETRY_UNCACHED_REP:
3768                 case -NFS4ERR_OLD_STATEID:
3769                         task->tk_status = 0;
3770                         return -EAGAIN;
3771         }
3772         task->tk_status = nfs4_map_errors(task->tk_status);
3773         return 0;
3774 wait_on_recovery:
3775         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3776         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3777                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3778         task->tk_status = 0;
3779         return -EAGAIN;
3780 }
3781
3782 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3783                 unsigned short port, struct rpc_cred *cred,
3784                 struct nfs4_setclientid_res *res)
3785 {
3786         nfs4_verifier sc_verifier;
3787         struct nfs4_setclientid setclientid = {
3788                 .sc_verifier = &sc_verifier,
3789                 .sc_prog = program,
3790                 .sc_cb_ident = clp->cl_cb_ident,
3791         };
3792         struct rpc_message msg = {
3793                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3794                 .rpc_argp = &setclientid,
3795                 .rpc_resp = res,
3796                 .rpc_cred = cred,
3797         };
3798         __be32 *p;
3799         int loop = 0;
3800         int status;
3801
3802         p = (__be32*)sc_verifier.data;
3803         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3804         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3805
3806         for(;;) {
3807                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3808                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3809                                 clp->cl_ipaddr,
3810                                 rpc_peeraddr2str(clp->cl_rpcclient,
3811                                                         RPC_DISPLAY_ADDR),
3812                                 rpc_peeraddr2str(clp->cl_rpcclient,
3813                                                         RPC_DISPLAY_PROTO),
3814                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3815                                 clp->cl_id_uniquifier);
3816                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3817                                 sizeof(setclientid.sc_netid),
3818                                 rpc_peeraddr2str(clp->cl_rpcclient,
3819                                                         RPC_DISPLAY_NETID));
3820                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3821                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3822                                 clp->cl_ipaddr, port >> 8, port & 255);
3823
3824                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3825                 if (status != -NFS4ERR_CLID_INUSE)
3826                         break;
3827                 if (loop != 0) {
3828                         ++clp->cl_id_uniquifier;
3829                         break;
3830                 }
3831                 ++loop;
3832                 ssleep(clp->cl_lease_time / HZ + 1);
3833         }
3834         return status;
3835 }
3836
3837 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3838                 struct nfs4_setclientid_res *arg,
3839                 struct rpc_cred *cred)
3840 {
3841         struct nfs_fsinfo fsinfo;
3842         struct rpc_message msg = {
3843                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3844                 .rpc_argp = arg,
3845                 .rpc_resp = &fsinfo,
3846                 .rpc_cred = cred,
3847         };
3848         unsigned long now;
3849         int status;
3850
3851         now = jiffies;
3852         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3853         if (status == 0) {
3854                 spin_lock(&clp->cl_lock);
3855                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3856                 clp->cl_last_renewal = now;
3857                 spin_unlock(&clp->cl_lock);
3858         }
3859         return status;
3860 }
3861
3862 struct nfs4_delegreturndata {
3863         struct nfs4_delegreturnargs args;
3864         struct nfs4_delegreturnres res;
3865         struct nfs_fh fh;
3866         nfs4_stateid stateid;
3867         unsigned long timestamp;
3868         struct nfs_fattr fattr;
3869         int rpc_status;
3870 };
3871
3872 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3873 {
3874         struct nfs4_delegreturndata *data = calldata;
3875
3876         if (!nfs4_sequence_done(task, &data->res.seq_res))
3877                 return;
3878
3879         switch (task->tk_status) {
3880         case -NFS4ERR_STALE_STATEID:
3881         case -NFS4ERR_EXPIRED:
3882         case 0:
3883                 renew_lease(data->res.server, data->timestamp);
3884                 break;
3885         default:
3886                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3887                                 -EAGAIN) {
3888                         rpc_restart_call_prepare(task);
3889                         return;
3890                 }
3891         }
3892         data->rpc_status = task->tk_status;
3893 }
3894
3895 static void nfs4_delegreturn_release(void *calldata)
3896 {
3897         kfree(calldata);
3898 }
3899
3900 #if defined(CONFIG_NFS_V4_1)
3901 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3902 {
3903         struct nfs4_delegreturndata *d_data;
3904
3905         d_data = (struct nfs4_delegreturndata *)data;
3906
3907         if (nfs4_setup_sequence(d_data->res.server,
3908                                 &d_data->args.seq_args,
3909                                 &d_data->res.seq_res, task))
3910                 return;
3911         rpc_call_start(task);
3912 }
3913 #endif /* CONFIG_NFS_V4_1 */
3914
3915 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3916 #if defined(CONFIG_NFS_V4_1)
3917         .rpc_call_prepare = nfs4_delegreturn_prepare,
3918 #endif /* CONFIG_NFS_V4_1 */
3919         .rpc_call_done = nfs4_delegreturn_done,
3920         .rpc_release = nfs4_delegreturn_release,
3921 };
3922
3923 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3924 {
3925         struct nfs4_delegreturndata *data;
3926         struct nfs_server *server = NFS_SERVER(inode);
3927         struct rpc_task *task;
3928         struct rpc_message msg = {
3929                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3930                 .rpc_cred = cred,
3931         };
3932         struct rpc_task_setup task_setup_data = {
3933                 .rpc_client = server->client,
3934                 .rpc_message = &msg,
3935                 .callback_ops = &nfs4_delegreturn_ops,
3936                 .flags = RPC_TASK_ASYNC,
3937         };
3938         int status = 0;
3939
3940         data = kzalloc(sizeof(*data), GFP_NOFS);
3941         if (data == NULL)
3942                 return -ENOMEM;
3943         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3944         data->args.fhandle = &data->fh;
3945         data->args.stateid = &data->stateid;
3946         data->args.bitmask = server->attr_bitmask;
3947         nfs_copy_fh(&data->fh, NFS_FH(inode));
3948         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3949         data->res.fattr = &data->fattr;
3950         data->res.server = server;
3951         nfs_fattr_init(data->res.fattr);
3952         data->timestamp = jiffies;
3953         data->rpc_status = 0;
3954
3955         task_setup_data.callback_data = data;
3956         msg.rpc_argp = &data->args;
3957         msg.rpc_resp = &data->res;
3958         task = rpc_run_task(&task_setup_data);
3959         if (IS_ERR(task))
3960                 return PTR_ERR(task);
3961         if (!issync)
3962                 goto out;
3963         status = nfs4_wait_for_completion_rpc_task(task);
3964         if (status != 0)
3965                 goto out;
3966         status = data->rpc_status;
3967         if (status != 0)
3968                 goto out;
3969         nfs_refresh_inode(inode, &data->fattr);
3970 out:
3971         rpc_put_task(task);
3972         return status;
3973 }
3974
3975 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3976 {
3977         struct nfs_server *server = NFS_SERVER(inode);
3978         struct nfs4_exception exception = { };
3979         int err;
3980         do {
3981                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3982                 switch (err) {
3983                         case -NFS4ERR_STALE_STATEID:
3984                         case -NFS4ERR_EXPIRED:
3985                         case 0:
3986                                 return 0;
3987                 }
3988                 err = nfs4_handle_exception(server, err, &exception);
3989         } while (exception.retry);
3990         return err;
3991 }
3992
3993 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3994 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3995
3996 /*
3997  * sleep, with exponential backoff, and retry the LOCK operation.
3998  */
3999 static unsigned long
4000 nfs4_set_lock_task_retry(unsigned long timeout)
4001 {
4002         freezable_schedule_timeout_killable(timeout);
4003         timeout <<= 1;
4004         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4005                 return NFS4_LOCK_MAXTIMEOUT;
4006         return timeout;
4007 }
4008
4009 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4010 {
4011         struct inode *inode = state->inode;
4012         struct nfs_server *server = NFS_SERVER(inode);
4013         struct nfs_client *clp = server->nfs_client;
4014         struct nfs_lockt_args arg = {
4015                 .fh = NFS_FH(inode),
4016                 .fl = request,
4017         };
4018         struct nfs_lockt_res res = {
4019                 .denied = request,
4020         };
4021         struct rpc_message msg = {
4022                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4023                 .rpc_argp       = &arg,
4024                 .rpc_resp       = &res,
4025                 .rpc_cred       = state->owner->so_cred,
4026         };
4027         struct nfs4_lock_state *lsp;
4028         int status;
4029
4030         arg.lock_owner.clientid = clp->cl_clientid;
4031         status = nfs4_set_lock_state(state, request);
4032         if (status != 0)
4033                 goto out;
4034         lsp = request->fl_u.nfs4_fl.owner;
4035         arg.lock_owner.id = lsp->ls_id;
4036         arg.lock_owner.s_dev = server->s_dev;
4037         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4038         switch (status) {
4039                 case 0:
4040                         request->fl_type = F_UNLCK;
4041                         break;
4042                 case -NFS4ERR_DENIED:
4043                         status = 0;
4044         }
4045         request->fl_ops->fl_release_private(request);
4046 out:
4047         return status;
4048 }
4049
4050 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4051 {
4052         struct nfs4_exception exception = { };
4053         int err;
4054
4055         do {
4056                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4057                                 _nfs4_proc_getlk(state, cmd, request),
4058                                 &exception);
4059         } while (exception.retry);
4060         return err;
4061 }
4062
4063 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4064 {
4065         int res = 0;
4066         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4067                 case FL_POSIX:
4068                         res = posix_lock_file_wait(file, fl);
4069                         break;
4070                 case FL_FLOCK:
4071                         res = flock_lock_file_wait(file, fl);
4072                         break;
4073                 default:
4074                         BUG();
4075         }
4076         return res;
4077 }
4078
4079 struct nfs4_unlockdata {
4080         struct nfs_locku_args arg;
4081         struct nfs_locku_res res;
4082         struct nfs4_lock_state *lsp;
4083         struct nfs_open_context *ctx;
4084         struct file_lock fl;
4085         const struct nfs_server *server;
4086         unsigned long timestamp;
4087 };
4088
4089 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4090                 struct nfs_open_context *ctx,
4091                 struct nfs4_lock_state *lsp,
4092                 struct nfs_seqid *seqid)
4093 {
4094         struct nfs4_unlockdata *p;
4095         struct inode *inode = lsp->ls_state->inode;
4096
4097         p = kzalloc(sizeof(*p), GFP_NOFS);
4098         if (p == NULL)
4099                 return NULL;
4100         p->arg.fh = NFS_FH(inode);
4101         p->arg.fl = &p->fl;
4102         p->arg.seqid = seqid;
4103         p->res.seqid = seqid;
4104         p->arg.stateid = &lsp->ls_stateid;
4105         p->lsp = lsp;
4106         atomic_inc(&lsp->ls_count);
4107         /* Ensure we don't close file until we're done freeing locks! */
4108         p->ctx = get_nfs_open_context(ctx);
4109         memcpy(&p->fl, fl, sizeof(p->fl));
4110         p->server = NFS_SERVER(inode);
4111         return p;
4112 }
4113
4114 static void nfs4_locku_release_calldata(void *data)
4115 {
4116         struct nfs4_unlockdata *calldata = data;
4117         nfs_free_seqid(calldata->arg.seqid);
4118         nfs4_put_lock_state(calldata->lsp);
4119         put_nfs_open_context(calldata->ctx);
4120         kfree(calldata);
4121 }
4122
4123 static void nfs4_locku_done(struct rpc_task *task, void *data)
4124 {
4125         struct nfs4_unlockdata *calldata = data;
4126
4127         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4128                 return;
4129         switch (task->tk_status) {
4130                 case 0:
4131                         memcpy(calldata->lsp->ls_stateid.data,
4132                                         calldata->res.stateid.data,
4133                                         sizeof(calldata->lsp->ls_stateid.data));
4134                         renew_lease(calldata->server, calldata->timestamp);
4135                         break;
4136                 case -NFS4ERR_BAD_STATEID:
4137                 case -NFS4ERR_OLD_STATEID:
4138                 case -NFS4ERR_STALE_STATEID:
4139                 case -NFS4ERR_EXPIRED:
4140                         break;
4141                 default:
4142                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4143                                 rpc_restart_call_prepare(task);
4144         }
4145 }
4146
4147 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4148 {
4149         struct nfs4_unlockdata *calldata = data;
4150
4151         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4152                 return;
4153         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4154                 /* Note: exit _without_ running nfs4_locku_done */
4155                 task->tk_action = NULL;
4156                 return;
4157         }
4158         calldata->timestamp = jiffies;
4159         if (nfs4_setup_sequence(calldata->server,
4160                                 &calldata->arg.seq_args,
4161                                 &calldata->res.seq_res, task))
4162                 return;
4163         rpc_call_start(task);
4164 }
4165
4166 static const struct rpc_call_ops nfs4_locku_ops = {
4167         .rpc_call_prepare = nfs4_locku_prepare,
4168         .rpc_call_done = nfs4_locku_done,
4169         .rpc_release = nfs4_locku_release_calldata,
4170 };
4171
4172 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4173                 struct nfs_open_context *ctx,
4174                 struct nfs4_lock_state *lsp,
4175                 struct nfs_seqid *seqid)
4176 {
4177         struct nfs4_unlockdata *data;
4178         struct rpc_message msg = {
4179                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4180                 .rpc_cred = ctx->cred,
4181         };
4182         struct rpc_task_setup task_setup_data = {
4183                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4184                 .rpc_message = &msg,
4185                 .callback_ops = &nfs4_locku_ops,
4186                 .workqueue = nfsiod_workqueue,
4187                 .flags = RPC_TASK_ASYNC,
4188         };
4189
4190         /* Ensure this is an unlock - when canceling a lock, the
4191          * canceled lock is passed in, and it won't be an unlock.
4192          */
4193         fl->fl_type = F_UNLCK;
4194
4195         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4196         if (data == NULL) {
4197                 nfs_free_seqid(seqid);
4198                 return ERR_PTR(-ENOMEM);
4199         }
4200
4201         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4202         msg.rpc_argp = &data->arg;
4203         msg.rpc_resp = &data->res;
4204         task_setup_data.callback_data = data;
4205         return rpc_run_task(&task_setup_data);
4206 }
4207
4208 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4209 {
4210         struct nfs_inode *nfsi = NFS_I(state->inode);
4211         struct nfs_seqid *seqid;
4212         struct nfs4_lock_state *lsp;
4213         struct rpc_task *task;
4214         int status = 0;
4215         unsigned char fl_flags = request->fl_flags;
4216
4217         status = nfs4_set_lock_state(state, request);
4218         /* Unlock _before_ we do the RPC call */
4219         request->fl_flags |= FL_EXISTS;
4220         down_read(&nfsi->rwsem);
4221         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4222                 up_read(&nfsi->rwsem);
4223                 goto out;
4224         }
4225         up_read(&nfsi->rwsem);
4226         if (status != 0)
4227                 goto out;
4228         /* Is this a delegated lock? */
4229         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4230                 goto out;
4231         lsp = request->fl_u.nfs4_fl.owner;
4232         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4233         status = -ENOMEM;
4234         if (seqid == NULL)
4235                 goto out;
4236         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4237         status = PTR_ERR(task);
4238         if (IS_ERR(task))
4239                 goto out;
4240         status = nfs4_wait_for_completion_rpc_task(task);
4241         rpc_put_task(task);
4242 out:
4243         request->fl_flags = fl_flags;
4244         return status;
4245 }
4246
4247 struct nfs4_lockdata {
4248         struct nfs_lock_args arg;
4249         struct nfs_lock_res res;
4250         struct nfs4_lock_state *lsp;
4251         struct nfs_open_context *ctx;
4252         struct file_lock fl;
4253         unsigned long timestamp;
4254         int rpc_status;
4255         int cancelled;
4256         struct nfs_server *server;
4257 };
4258
4259 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4260                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4261                 gfp_t gfp_mask)
4262 {
4263         struct nfs4_lockdata *p;
4264         struct inode *inode = lsp->ls_state->inode;
4265         struct nfs_server *server = NFS_SERVER(inode);
4266
4267         p = kzalloc(sizeof(*p), gfp_mask);
4268         if (p == NULL)
4269                 return NULL;
4270
4271         p->arg.fh = NFS_FH(inode);
4272         p->arg.fl = &p->fl;
4273         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4274         if (p->arg.open_seqid == NULL)
4275                 goto out_free;
4276         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4277         if (p->arg.lock_seqid == NULL)
4278                 goto out_free_seqid;
4279         p->arg.lock_stateid = &lsp->ls_stateid;
4280         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4281         p->arg.lock_owner.id = lsp->ls_id;
4282         p->arg.lock_owner.s_dev = server->s_dev;
4283         p->res.lock_seqid = p->arg.lock_seqid;
4284         p->lsp = lsp;
4285         p->server = server;
4286         atomic_inc(&lsp->ls_count);
4287         p->ctx = get_nfs_open_context(ctx);
4288         memcpy(&p->fl, fl, sizeof(p->fl));
4289         return p;
4290 out_free_seqid:
4291         nfs_free_seqid(p->arg.open_seqid);
4292 out_free:
4293         kfree(p);
4294         return NULL;
4295 }
4296
4297 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4298 {
4299         struct nfs4_lockdata *data = calldata;
4300         struct nfs4_state *state = data->lsp->ls_state;
4301
4302         dprintk("%s: begin!\n", __func__);
4303         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4304                 return;
4305         /* Do we need to do an open_to_lock_owner? */
4306         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4307                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4308                         return;
4309                 data->arg.open_stateid = &state->stateid;
4310                 data->arg.new_lock_owner = 1;
4311                 data->res.open_seqid = data->arg.open_seqid;
4312         } else
4313                 data->arg.new_lock_owner = 0;
4314         data->timestamp = jiffies;
4315         if (nfs4_setup_sequence(data->server,
4316                                 &data->arg.seq_args,
4317                                 &data->res.seq_res, task))
4318                 return;
4319         rpc_call_start(task);
4320         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4321 }
4322
4323 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4324 {
4325         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4326         nfs4_lock_prepare(task, calldata);
4327 }
4328
4329 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4330 {
4331         struct nfs4_lockdata *data = calldata;
4332
4333         dprintk("%s: begin!\n", __func__);
4334
4335         if (!nfs4_sequence_done(task, &data->res.seq_res))
4336                 return;
4337
4338         data->rpc_status = task->tk_status;
4339         if (data->arg.new_lock_owner != 0) {
4340                 if (data->rpc_status == 0)
4341                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4342                 else
4343                         goto out;
4344         }
4345         if (data->rpc_status == 0) {
4346                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4347                                         sizeof(data->lsp->ls_stateid.data));
4348                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4349                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4350         }
4351 out:
4352         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4353 }
4354
4355 static void nfs4_lock_release(void *calldata)
4356 {
4357         struct nfs4_lockdata *data = calldata;
4358
4359         dprintk("%s: begin!\n", __func__);
4360         nfs_free_seqid(data->arg.open_seqid);
4361         if (data->cancelled != 0) {
4362                 struct rpc_task *task;
4363                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4364                                 data->arg.lock_seqid);
4365                 if (!IS_ERR(task))
4366                         rpc_put_task_async(task);
4367                 dprintk("%s: cancelling lock!\n", __func__);
4368         } else
4369                 nfs_free_seqid(data->arg.lock_seqid);
4370         nfs4_put_lock_state(data->lsp);
4371         put_nfs_open_context(data->ctx);
4372         kfree(data);
4373         dprintk("%s: done!\n", __func__);
4374 }
4375
4376 static const struct rpc_call_ops nfs4_lock_ops = {
4377         .rpc_call_prepare = nfs4_lock_prepare,
4378         .rpc_call_done = nfs4_lock_done,
4379         .rpc_release = nfs4_lock_release,
4380 };
4381
4382 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4383         .rpc_call_prepare = nfs4_recover_lock_prepare,
4384         .rpc_call_done = nfs4_lock_done,
4385         .rpc_release = nfs4_lock_release,
4386 };
4387
4388 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4389 {
4390         switch (error) {
4391         case -NFS4ERR_ADMIN_REVOKED:
4392         case -NFS4ERR_BAD_STATEID:
4393                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4394                 if (new_lock_owner != 0 ||
4395                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4396                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4397                 break;
4398         case -NFS4ERR_STALE_STATEID:
4399                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4400         case -NFS4ERR_EXPIRED:
4401                 nfs4_schedule_lease_recovery(server->nfs_client);
4402         };
4403 }
4404
4405 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4406 {
4407         struct nfs4_lockdata *data;
4408         struct rpc_task *task;
4409         struct rpc_message msg = {
4410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4411                 .rpc_cred = state->owner->so_cred,
4412         };
4413         struct rpc_task_setup task_setup_data = {
4414                 .rpc_client = NFS_CLIENT(state->inode),
4415                 .rpc_message = &msg,
4416                 .callback_ops = &nfs4_lock_ops,
4417                 .workqueue = nfsiod_workqueue,
4418                 .flags = RPC_TASK_ASYNC,
4419         };
4420         int ret;
4421
4422         dprintk("%s: begin!\n", __func__);
4423         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4424                         fl->fl_u.nfs4_fl.owner,
4425                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4426         if (data == NULL)
4427                 return -ENOMEM;
4428         if (IS_SETLKW(cmd))
4429                 data->arg.block = 1;
4430         if (recovery_type > NFS_LOCK_NEW) {
4431                 if (recovery_type == NFS_LOCK_RECLAIM)
4432                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4433                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4434         }
4435         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4436         msg.rpc_argp = &data->arg;
4437         msg.rpc_resp = &data->res;
4438         task_setup_data.callback_data = data;
4439         task = rpc_run_task(&task_setup_data);
4440         if (IS_ERR(task))
4441                 return PTR_ERR(task);
4442         ret = nfs4_wait_for_completion_rpc_task(task);
4443         if (ret == 0) {
4444                 ret = data->rpc_status;
4445                 if (ret)
4446                         nfs4_handle_setlk_error(data->server, data->lsp,
4447                                         data->arg.new_lock_owner, ret);
4448         } else
4449                 data->cancelled = 1;
4450         rpc_put_task(task);
4451         dprintk("%s: done, ret = %d!\n", __func__, ret);
4452         return ret;
4453 }
4454
4455 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4456 {
4457         struct nfs_server *server = NFS_SERVER(state->inode);
4458         struct nfs4_exception exception = { };
4459         int err;
4460
4461         do {
4462                 /* Cache the lock if possible... */
4463                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4464                         return 0;
4465                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4466                 if (err != -NFS4ERR_DELAY)
4467                         break;
4468                 nfs4_handle_exception(server, err, &exception);
4469         } while (exception.retry);
4470         return err;
4471 }
4472
4473 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4474 {
4475         struct nfs_server *server = NFS_SERVER(state->inode);
4476         struct nfs4_exception exception = { };
4477         int err;
4478
4479         err = nfs4_set_lock_state(state, request);
4480         if (err != 0)
4481                 return err;
4482         do {
4483                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4484                         return 0;
4485                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4486                 switch (err) {
4487                 default:
4488                         goto out;
4489                 case -NFS4ERR_GRACE:
4490                 case -NFS4ERR_DELAY:
4491                         nfs4_handle_exception(server, err, &exception);
4492                         err = 0;
4493                 }
4494         } while (exception.retry);
4495 out:
4496         return err;
4497 }
4498
4499 #if defined(CONFIG_NFS_V4_1)
4500 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4501 {
4502         int status;
4503         struct nfs_server *server = NFS_SERVER(state->inode);
4504
4505         status = nfs41_test_stateid(server, state);
4506         if (status == NFS_OK)
4507                 return 0;
4508         nfs41_free_stateid(server, state);
4509         return nfs4_lock_expired(state, request);
4510 }
4511 #endif
4512
4513 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4514 {
4515         struct nfs_inode *nfsi = NFS_I(state->inode);
4516         unsigned char fl_flags = request->fl_flags;
4517         int status = -ENOLCK;
4518
4519         if ((fl_flags & FL_POSIX) &&
4520                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4521                 goto out;
4522         /* Is this a delegated open? */
4523         status = nfs4_set_lock_state(state, request);
4524         if (status != 0)
4525                 goto out;
4526         request->fl_flags |= FL_ACCESS;
4527         status = do_vfs_lock(request->fl_file, request);
4528         if (status < 0)
4529                 goto out;
4530         down_read(&nfsi->rwsem);
4531         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4532                 /* Yes: cache locks! */
4533                 /* ...but avoid races with delegation recall... */
4534                 request->fl_flags = fl_flags & ~FL_SLEEP;
4535                 status = do_vfs_lock(request->fl_file, request);
4536                 goto out_unlock;
4537         }
4538         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4539         if (status != 0)
4540                 goto out_unlock;
4541         /* Note: we always want to sleep here! */
4542         request->fl_flags = fl_flags | FL_SLEEP;
4543         if (do_vfs_lock(request->fl_file, request) < 0)
4544                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4545 out_unlock:
4546         up_read(&nfsi->rwsem);
4547 out:
4548         request->fl_flags = fl_flags;
4549         return status;
4550 }
4551
4552 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4553 {
4554         struct nfs4_exception exception = { };
4555         int err;
4556
4557         do {
4558                 err = _nfs4_proc_setlk(state, cmd, request);
4559                 if (err == -NFS4ERR_DENIED)
4560                         err = -EAGAIN;
4561                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4562                                 err, &exception);
4563         } while (exception.retry);
4564         return err;
4565 }
4566
4567 static int
4568 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4569 {
4570         struct nfs_open_context *ctx;
4571         struct nfs4_state *state;
4572         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4573         int status;
4574
4575         /* verify open state */
4576         ctx = nfs_file_open_context(filp);
4577         state = ctx->state;
4578
4579         if (request->fl_start < 0 || request->fl_end < 0)
4580                 return -EINVAL;
4581
4582         if (IS_GETLK(cmd)) {
4583                 if (state != NULL)
4584                         return nfs4_proc_getlk(state, F_GETLK, request);
4585                 return 0;
4586         }
4587
4588         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4589                 return -EINVAL;
4590
4591         if (request->fl_type == F_UNLCK) {
4592                 if (state != NULL)
4593                         return nfs4_proc_unlck(state, cmd, request);
4594                 return 0;
4595         }
4596
4597         if (state == NULL)
4598                 return -ENOLCK;
4599         do {
4600                 status = nfs4_proc_setlk(state, cmd, request);
4601                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4602                         break;
4603                 timeout = nfs4_set_lock_task_retry(timeout);
4604                 status = -ERESTARTSYS;
4605                 if (signalled())
4606                         break;
4607         } while(status < 0);
4608         return status;
4609 }
4610
4611 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4612 {
4613         struct nfs_server *server = NFS_SERVER(state->inode);
4614         struct nfs4_exception exception = { };
4615         int err;
4616
4617         err = nfs4_set_lock_state(state, fl);
4618         if (err != 0)
4619                 goto out;
4620         do {
4621                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4622                 switch (err) {
4623                         default:
4624                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4625                                                 __func__, err);
4626                         case 0:
4627                         case -ESTALE:
4628                                 goto out;
4629                         case -NFS4ERR_EXPIRED:
4630                                 nfs4_schedule_stateid_recovery(server, state);
4631                         case -NFS4ERR_STALE_CLIENTID:
4632                         case -NFS4ERR_STALE_STATEID:
4633                                 nfs4_schedule_lease_recovery(server->nfs_client);
4634                                 goto out;
4635                         case -NFS4ERR_BADSESSION:
4636                         case -NFS4ERR_BADSLOT:
4637                         case -NFS4ERR_BAD_HIGH_SLOT:
4638                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4639                         case -NFS4ERR_DEADSESSION:
4640                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4641                                 goto out;
4642                         case -ERESTARTSYS:
4643                                 /*
4644                                  * The show must go on: exit, but mark the
4645                                  * stateid as needing recovery.
4646                                  */
4647                         case -NFS4ERR_ADMIN_REVOKED:
4648                         case -NFS4ERR_BAD_STATEID:
4649                         case -NFS4ERR_OPENMODE:
4650                                 nfs4_schedule_stateid_recovery(server, state);
4651                                 err = 0;
4652                                 goto out;
4653                         case -EKEYEXPIRED:
4654                                 /*
4655                                  * User RPCSEC_GSS context has expired.
4656                                  * We cannot recover this stateid now, so
4657                                  * skip it and allow recovery thread to
4658                                  * proceed.
4659                                  */
4660                                 err = 0;
4661                                 goto out;
4662                         case -ENOMEM:
4663                         case -NFS4ERR_DENIED:
4664                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4665                                 err = 0;
4666                                 goto out;
4667                         case -NFS4ERR_DELAY:
4668                                 break;
4669                 }
4670                 err = nfs4_handle_exception(server, err, &exception);
4671         } while (exception.retry);
4672 out:
4673         return err;
4674 }
4675
4676 static void nfs4_release_lockowner_release(void *calldata)
4677 {
4678         kfree(calldata);
4679 }
4680
4681 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4682         .rpc_release = nfs4_release_lockowner_release,
4683 };
4684
4685 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4686 {
4687         struct nfs_server *server = lsp->ls_state->owner->so_server;
4688         struct nfs_release_lockowner_args *args;
4689         struct rpc_message msg = {
4690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4691         };
4692
4693         if (server->nfs_client->cl_mvops->minor_version != 0)
4694                 return;
4695         args = kmalloc(sizeof(*args), GFP_NOFS);
4696         if (!args)
4697                 return;
4698         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4699         args->lock_owner.id = lsp->ls_id;
4700         args->lock_owner.s_dev = server->s_dev;
4701         msg.rpc_argp = args;
4702         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4703 }
4704
4705 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4706
4707 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4708                                    const void *buf, size_t buflen,
4709                                    int flags, int type)
4710 {
4711         if (strcmp(key, "") != 0)
4712                 return -EINVAL;
4713
4714         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4715 }
4716
4717 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4718                                    void *buf, size_t buflen, int type)
4719 {
4720         if (strcmp(key, "") != 0)
4721                 return -EINVAL;
4722
4723         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4724 }
4725
4726 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4727                                        size_t list_len, const char *name,
4728                                        size_t name_len, int type)
4729 {
4730         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4731
4732         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4733                 return 0;
4734
4735         if (list && len <= list_len)
4736                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4737         return len;
4738 }
4739
4740 /*
4741  * nfs_fhget will use either the mounted_on_fileid or the fileid
4742  */
4743 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4744 {
4745         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4746                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4747               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4748               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4749                 return;
4750
4751         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4752                 NFS_ATTR_FATTR_NLINK;
4753         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4754         fattr->nlink = 2;
4755 }
4756
4757 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4758                 struct nfs4_fs_locations *fs_locations, struct page *page)
4759 {
4760         struct nfs_server *server = NFS_SERVER(dir);
4761         u32 bitmask[2] = {
4762                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4763         };
4764         struct nfs4_fs_locations_arg args = {
4765                 .dir_fh = NFS_FH(dir),
4766                 .name = name,
4767                 .page = page,
4768                 .bitmask = bitmask,
4769         };
4770         struct nfs4_fs_locations_res res = {
4771                 .fs_locations = fs_locations,
4772         };
4773         struct rpc_message msg = {
4774                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4775                 .rpc_argp = &args,
4776                 .rpc_resp = &res,
4777         };
4778         int status;
4779
4780         dprintk("%s: start\n", __func__);
4781
4782         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4783          * is not supported */
4784         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4785                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4786         else
4787                 bitmask[0] |= FATTR4_WORD0_FILEID;
4788
4789         nfs_fattr_init(&fs_locations->fattr);
4790         fs_locations->server = server;
4791         fs_locations->nlocations = 0;
4792         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4793         dprintk("%s: returned status = %d\n", __func__, status);
4794         return status;
4795 }
4796
4797 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4798 {
4799         int status;
4800         struct nfs4_secinfo_arg args = {
4801                 .dir_fh = NFS_FH(dir),
4802                 .name   = name,
4803         };
4804         struct nfs4_secinfo_res res = {
4805                 .flavors     = flavors,
4806         };
4807         struct rpc_message msg = {
4808                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4809                 .rpc_argp = &args,
4810                 .rpc_resp = &res,
4811         };
4812
4813         dprintk("NFS call  secinfo %s\n", name->name);
4814         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4815         dprintk("NFS reply  secinfo: %d\n", status);
4816         return status;
4817 }
4818
4819 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4820 {
4821         struct nfs4_exception exception = { };
4822         int err;
4823         do {
4824                 err = nfs4_handle_exception(NFS_SERVER(dir),
4825                                 _nfs4_proc_secinfo(dir, name, flavors),
4826                                 &exception);
4827         } while (exception.retry);
4828         return err;
4829 }
4830
4831 #ifdef CONFIG_NFS_V4_1
4832 /*
4833  * Check the exchange flags returned by the server for invalid flags, having
4834  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4835  * DS flags set.
4836  */
4837 static int nfs4_check_cl_exchange_flags(u32 flags)
4838 {
4839         if (flags & ~EXCHGID4_FLAG_MASK_R)
4840                 goto out_inval;
4841         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4842             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4843                 goto out_inval;
4844         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4845                 goto out_inval;
4846         return NFS_OK;
4847 out_inval:
4848         return -NFS4ERR_INVAL;
4849 }
4850
4851 static bool
4852 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4853 {
4854         if (a->server_scope_sz == b->server_scope_sz &&
4855             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4856                 return true;
4857
4858         return false;
4859 }
4860
4861 /*
4862  * nfs4_proc_exchange_id()
4863  *
4864  * Since the clientid has expired, all compounds using sessions
4865  * associated with the stale clientid will be returning
4866  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4867  * be in some phase of session reset.
4868  */
4869 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4870 {
4871         nfs4_verifier verifier;
4872         struct nfs41_exchange_id_args args = {
4873                 .client = clp,
4874                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4875         };
4876         struct nfs41_exchange_id_res res = {
4877                 .client = clp,
4878         };
4879         int status;
4880         struct rpc_message msg = {
4881                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4882                 .rpc_argp = &args,
4883                 .rpc_resp = &res,
4884                 .rpc_cred = cred,
4885         };
4886         __be32 *p;
4887
4888         dprintk("--> %s\n", __func__);
4889         BUG_ON(clp == NULL);
4890
4891         p = (u32 *)verifier.data;
4892         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4893         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4894         args.verifier = &verifier;
4895
4896         args.id_len = scnprintf(args.id, sizeof(args.id),
4897                                 "%s/%s.%s/%u",
4898                                 clp->cl_ipaddr,
4899                                 init_utsname()->nodename,
4900                                 init_utsname()->domainname,
4901                                 clp->cl_rpcclient->cl_auth->au_flavor);
4902
4903         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4904         if (unlikely(!res.server_scope))
4905                 return -ENOMEM;
4906
4907         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4908         if (!status)
4909                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4910
4911         if (!status) {
4912                 if (clp->server_scope &&
4913                     !nfs41_same_server_scope(clp->server_scope,
4914                                              res.server_scope)) {
4915                         dprintk("%s: server_scope mismatch detected\n",
4916                                 __func__);
4917                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4918                         kfree(clp->server_scope);
4919                         clp->server_scope = NULL;
4920                 }
4921
4922                 if (!clp->server_scope)
4923                         clp->server_scope = res.server_scope;
4924                 else
4925                         kfree(res.server_scope);
4926         }
4927
4928         dprintk("<-- %s status= %d\n", __func__, status);
4929         return status;
4930 }
4931
4932 struct nfs4_get_lease_time_data {
4933         struct nfs4_get_lease_time_args *args;
4934         struct nfs4_get_lease_time_res *res;
4935         struct nfs_client *clp;
4936 };
4937
4938 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4939                                         void *calldata)
4940 {
4941         int ret;
4942         struct nfs4_get_lease_time_data *data =
4943                         (struct nfs4_get_lease_time_data *)calldata;
4944
4945         dprintk("--> %s\n", __func__);
4946         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4947         /* just setup sequence, do not trigger session recovery
4948            since we're invoked within one */
4949         ret = nfs41_setup_sequence(data->clp->cl_session,
4950                                    &data->args->la_seq_args,
4951                                    &data->res->lr_seq_res, task);
4952
4953         BUG_ON(ret == -EAGAIN);
4954         rpc_call_start(task);
4955         dprintk("<-- %s\n", __func__);
4956 }
4957
4958 /*
4959  * Called from nfs4_state_manager thread for session setup, so don't recover
4960  * from sequence operation or clientid errors.
4961  */
4962 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4963 {
4964         struct nfs4_get_lease_time_data *data =
4965                         (struct nfs4_get_lease_time_data *)calldata;
4966
4967         dprintk("--> %s\n", __func__);
4968         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4969                 return;
4970         switch (task->tk_status) {
4971         case -NFS4ERR_DELAY:
4972         case -NFS4ERR_GRACE:
4973                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4974                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4975                 task->tk_status = 0;
4976                 /* fall through */
4977         case -NFS4ERR_RETRY_UNCACHED_REP:
4978                 rpc_restart_call_prepare(task);
4979                 return;
4980         }
4981         dprintk("<-- %s\n", __func__);
4982 }
4983
4984 struct rpc_call_ops nfs4_get_lease_time_ops = {
4985         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4986         .rpc_call_done = nfs4_get_lease_time_done,
4987 };
4988
4989 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4990 {
4991         struct rpc_task *task;
4992         struct nfs4_get_lease_time_args args;
4993         struct nfs4_get_lease_time_res res = {
4994                 .lr_fsinfo = fsinfo,
4995         };
4996         struct nfs4_get_lease_time_data data = {
4997                 .args = &args,
4998                 .res = &res,
4999                 .clp = clp,
5000         };
5001         struct rpc_message msg = {
5002                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5003                 .rpc_argp = &args,
5004                 .rpc_resp = &res,
5005         };
5006         struct rpc_task_setup task_setup = {
5007                 .rpc_client = clp->cl_rpcclient,
5008                 .rpc_message = &msg,
5009                 .callback_ops = &nfs4_get_lease_time_ops,
5010                 .callback_data = &data,
5011                 .flags = RPC_TASK_TIMEOUT,
5012         };
5013         int status;
5014
5015         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5016         dprintk("--> %s\n", __func__);
5017         task = rpc_run_task(&task_setup);
5018
5019         if (IS_ERR(task))
5020                 status = PTR_ERR(task);
5021         else {
5022                 status = task->tk_status;
5023                 rpc_put_task(task);
5024         }
5025         dprintk("<-- %s return %d\n", __func__, status);
5026
5027         return status;
5028 }
5029
5030 /*
5031  * Reset a slot table
5032  */
5033 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5034                                  int ivalue)
5035 {
5036         struct nfs4_slot *new = NULL;
5037         int i;
5038         int ret = 0;
5039
5040         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5041                 max_reqs, tbl->max_slots);
5042
5043         /* Does the newly negotiated max_reqs match the existing slot table? */
5044         if (max_reqs != tbl->max_slots) {
5045                 ret = -ENOMEM;
5046                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5047                               GFP_NOFS);
5048                 if (!new)
5049                         goto out;
5050                 ret = 0;
5051                 kfree(tbl->slots);
5052         }
5053         spin_lock(&tbl->slot_tbl_lock);
5054         if (new) {
5055                 tbl->slots = new;
5056                 tbl->max_slots = max_reqs;
5057         }
5058         for (i = 0; i < tbl->max_slots; ++i)
5059                 tbl->slots[i].seq_nr = ivalue;
5060         spin_unlock(&tbl->slot_tbl_lock);
5061         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5062                 tbl, tbl->slots, tbl->max_slots);
5063 out:
5064         dprintk("<-- %s: return %d\n", __func__, ret);
5065         return ret;
5066 }
5067
5068 /* Destroy the slot table */
5069 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5070 {
5071         if (session->fc_slot_table.slots != NULL) {
5072                 kfree(session->fc_slot_table.slots);
5073                 session->fc_slot_table.slots = NULL;
5074         }
5075         if (session->bc_slot_table.slots != NULL) {
5076                 kfree(session->bc_slot_table.slots);
5077                 session->bc_slot_table.slots = NULL;
5078         }
5079         return;
5080 }
5081
5082 /*
5083  * Initialize slot table
5084  */
5085 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5086                 int max_slots, int ivalue)
5087 {
5088         struct nfs4_slot *slot;
5089         int ret = -ENOMEM;
5090
5091         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5092
5093         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5094
5095         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5096         if (!slot)
5097                 goto out;
5098         ret = 0;
5099
5100         spin_lock(&tbl->slot_tbl_lock);
5101         tbl->max_slots = max_slots;
5102         tbl->slots = slot;
5103         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5104         spin_unlock(&tbl->slot_tbl_lock);
5105         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5106                 tbl, tbl->slots, tbl->max_slots);
5107 out:
5108         dprintk("<-- %s: return %d\n", __func__, ret);
5109         return ret;
5110 }
5111
5112 /*
5113  * Initialize or reset the forechannel and backchannel tables
5114  */
5115 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5116 {
5117         struct nfs4_slot_table *tbl;
5118         int status;
5119
5120         dprintk("--> %s\n", __func__);
5121         /* Fore channel */
5122         tbl = &ses->fc_slot_table;
5123         if (tbl->slots == NULL) {
5124                 status = nfs4_init_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5125                 if (status) /* -ENOMEM */
5126                         return status;
5127         } else {
5128                 status = nfs4_reset_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5129                 if (status)
5130                         return status;
5131         }
5132         /* Back channel */
5133         tbl = &ses->bc_slot_table;
5134         if (tbl->slots == NULL) {
5135                 status = nfs4_init_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5136                 if (status)
5137                         /* Fore and back channel share a connection so get
5138                          * both slot tables or neither */
5139                         nfs4_destroy_slot_tables(ses);
5140         } else
5141                 status = nfs4_reset_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5142         return status;
5143 }
5144
5145 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5146 {
5147         struct nfs4_session *session;
5148         struct nfs4_slot_table *tbl;
5149
5150         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5151         if (!session)
5152                 return NULL;
5153
5154         tbl = &session->fc_slot_table;
5155         tbl->highest_used_slotid = -1;
5156         spin_lock_init(&tbl->slot_tbl_lock);
5157         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5158         init_completion(&tbl->complete);
5159
5160         tbl = &session->bc_slot_table;
5161         tbl->highest_used_slotid = -1;
5162         spin_lock_init(&tbl->slot_tbl_lock);
5163         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5164         init_completion(&tbl->complete);
5165
5166         session->session_state = 1<<NFS4_SESSION_INITING;
5167
5168         session->clp = clp;
5169         return session;
5170 }
5171
5172 void nfs4_destroy_session(struct nfs4_session *session)
5173 {
5174         nfs4_proc_destroy_session(session);
5175         dprintk("%s Destroy backchannel for xprt %p\n",
5176                 __func__, session->clp->cl_rpcclient->cl_xprt);
5177         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5178                                 NFS41_BC_MIN_CALLBACKS);
5179         nfs4_destroy_slot_tables(session);
5180         kfree(session);
5181 }
5182
5183 /*
5184  * Initialize the values to be used by the client in CREATE_SESSION
5185  * If nfs4_init_session set the fore channel request and response sizes,
5186  * use them.
5187  *
5188  * Set the back channel max_resp_sz_cached to zero to force the client to
5189  * always set csa_cachethis to FALSE because the current implementation
5190  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5191  */
5192 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5193 {
5194         struct nfs4_session *session = args->client->cl_session;
5195         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5196                      mxresp_sz = session->fc_attrs.max_resp_sz;
5197
5198         if (mxrqst_sz == 0)
5199                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5200         if (mxresp_sz == 0)
5201                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5202         /* Fore channel attributes */
5203         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5204         args->fc_attrs.max_resp_sz = mxresp_sz;
5205         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5206         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5207
5208         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5209                 "max_ops=%u max_reqs=%u\n",
5210                 __func__,
5211                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5212                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5213
5214         /* Back channel attributes */
5215         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5216         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5217         args->bc_attrs.max_resp_sz_cached = 0;
5218         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5219         args->bc_attrs.max_reqs = 1;
5220
5221         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5222                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5223                 __func__,
5224                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5225                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5226                 args->bc_attrs.max_reqs);
5227 }
5228
5229 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5230 {
5231         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5232         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5233
5234         if (rcvd->max_resp_sz > sent->max_resp_sz)
5235                 return -EINVAL;
5236         /*
5237          * Our requested max_ops is the minimum we need; we're not
5238          * prepared to break up compounds into smaller pieces than that.
5239          * So, no point even trying to continue if the server won't
5240          * cooperate:
5241          */
5242         if (rcvd->max_ops < sent->max_ops)
5243                 return -EINVAL;
5244         if (rcvd->max_reqs == 0)
5245                 return -EINVAL;
5246         return 0;
5247 }
5248
5249 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5250 {
5251         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5252         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5253
5254         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5255                 return -EINVAL;
5256         if (rcvd->max_resp_sz < sent->max_resp_sz)
5257                 return -EINVAL;
5258         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5259                 return -EINVAL;
5260         /* These would render the backchannel useless: */
5261         if (rcvd->max_ops  == 0)
5262                 return -EINVAL;
5263         if (rcvd->max_reqs == 0)
5264                 return -EINVAL;
5265         return 0;
5266 }
5267
5268 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5269                                      struct nfs4_session *session)
5270 {
5271         int ret;
5272
5273         ret = nfs4_verify_fore_channel_attrs(args, session);
5274         if (ret)
5275                 return ret;
5276         return nfs4_verify_back_channel_attrs(args, session);
5277 }
5278
5279 static int _nfs4_proc_create_session(struct nfs_client *clp)
5280 {
5281         struct nfs4_session *session = clp->cl_session;
5282         struct nfs41_create_session_args args = {
5283                 .client = clp,
5284                 .cb_program = NFS4_CALLBACK,
5285         };
5286         struct nfs41_create_session_res res = {
5287                 .client = clp,
5288         };
5289         struct rpc_message msg = {
5290                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5291                 .rpc_argp = &args,
5292                 .rpc_resp = &res,
5293         };
5294         int status;
5295
5296         nfs4_init_channel_attrs(&args);
5297         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5298
5299         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5300
5301         if (!status)
5302                 /* Verify the session's negotiated channel_attrs values */
5303                 status = nfs4_verify_channel_attrs(&args, session);
5304         if (!status) {
5305                 /* Increment the clientid slot sequence id */
5306                 clp->cl_seqid++;
5307         }
5308
5309         return status;
5310 }
5311
5312 /*
5313  * Issues a CREATE_SESSION operation to the server.
5314  * It is the responsibility of the caller to verify the session is
5315  * expired before calling this routine.
5316  */
5317 int nfs4_proc_create_session(struct nfs_client *clp)
5318 {
5319         int status;
5320         unsigned *ptr;
5321         struct nfs4_session *session = clp->cl_session;
5322
5323         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5324
5325         status = _nfs4_proc_create_session(clp);
5326         if (status)
5327                 goto out;
5328
5329         /* Init or reset the session slot tables */
5330         status = nfs4_setup_session_slot_tables(session);
5331         dprintk("slot table setup returned %d\n", status);
5332         if (status)
5333                 goto out;
5334
5335         ptr = (unsigned *)&session->sess_id.data[0];
5336         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5337                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5338 out:
5339         dprintk("<-- %s\n", __func__);
5340         return status;
5341 }
5342
5343 /*
5344  * Issue the over-the-wire RPC DESTROY_SESSION.
5345  * The caller must serialize access to this routine.
5346  */
5347 int nfs4_proc_destroy_session(struct nfs4_session *session)
5348 {
5349         int status = 0;
5350         struct rpc_message msg;
5351
5352         dprintk("--> nfs4_proc_destroy_session\n");
5353
5354         /* session is still being setup */
5355         if (session->clp->cl_cons_state != NFS_CS_READY)
5356                 return status;
5357
5358         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5359         msg.rpc_argp = session;
5360         msg.rpc_resp = NULL;
5361         msg.rpc_cred = NULL;
5362         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5363
5364         if (status)
5365                 printk(KERN_WARNING
5366                         "Got error %d from the server on DESTROY_SESSION. "
5367                         "Session has been destroyed regardless...\n", status);
5368
5369         dprintk("<-- nfs4_proc_destroy_session\n");
5370         return status;
5371 }
5372
5373 int nfs4_init_session(struct nfs_server *server)
5374 {
5375         struct nfs_client *clp = server->nfs_client;
5376         struct nfs4_session *session;
5377         unsigned int rsize, wsize;
5378         int ret;
5379
5380         if (!nfs4_has_session(clp))
5381                 return 0;
5382
5383         session = clp->cl_session;
5384         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5385                 return 0;
5386
5387         rsize = server->rsize;
5388         if (rsize == 0)
5389                 rsize = NFS_MAX_FILE_IO_SIZE;
5390         wsize = server->wsize;
5391         if (wsize == 0)
5392                 wsize = NFS_MAX_FILE_IO_SIZE;
5393
5394         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5395         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5396
5397         ret = nfs4_recover_expired_lease(server);
5398         if (!ret)
5399                 ret = nfs4_check_client_ready(clp);
5400         return ret;
5401 }
5402
5403 int nfs4_init_ds_session(struct nfs_client *clp)
5404 {
5405         struct nfs4_session *session = clp->cl_session;
5406         int ret;
5407
5408         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5409                 return 0;
5410
5411         ret = nfs4_client_recover_expired_lease(clp);
5412         if (!ret)
5413                 /* Test for the DS role */
5414                 if (!is_ds_client(clp))
5415                         ret = -ENODEV;
5416         if (!ret)
5417                 ret = nfs4_check_client_ready(clp);
5418         return ret;
5419
5420 }
5421 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5422
5423
5424 /*
5425  * Renew the cl_session lease.
5426  */
5427 struct nfs4_sequence_data {
5428         struct nfs_client *clp;
5429         struct nfs4_sequence_args args;
5430         struct nfs4_sequence_res res;
5431 };
5432
5433 static void nfs41_sequence_release(void *data)
5434 {
5435         struct nfs4_sequence_data *calldata = data;
5436         struct nfs_client *clp = calldata->clp;
5437
5438         if (atomic_read(&clp->cl_count) > 1)
5439                 nfs4_schedule_state_renewal(clp);
5440         nfs_put_client(clp);
5441         kfree(calldata);
5442 }
5443
5444 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5445 {
5446         switch(task->tk_status) {
5447         case -NFS4ERR_DELAY:
5448                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5449                 return -EAGAIN;
5450         default:
5451                 nfs4_schedule_lease_recovery(clp);
5452         }
5453         return 0;
5454 }
5455
5456 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5457 {
5458         struct nfs4_sequence_data *calldata = data;
5459         struct nfs_client *clp = calldata->clp;
5460
5461         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5462                 return;
5463
5464         if (task->tk_status < 0) {
5465                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5466                 if (atomic_read(&clp->cl_count) == 1)
5467                         goto out;
5468
5469                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5470                         rpc_restart_call_prepare(task);
5471                         return;
5472                 }
5473         }
5474         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5475 out:
5476         dprintk("<-- %s\n", __func__);
5477 }
5478
5479 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5480 {
5481         struct nfs4_sequence_data *calldata = data;
5482         struct nfs_client *clp = calldata->clp;
5483         struct nfs4_sequence_args *args;
5484         struct nfs4_sequence_res *res;
5485
5486         args = task->tk_msg.rpc_argp;
5487         res = task->tk_msg.rpc_resp;
5488
5489         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5490                 return;
5491         rpc_call_start(task);
5492 }
5493
5494 static const struct rpc_call_ops nfs41_sequence_ops = {
5495         .rpc_call_done = nfs41_sequence_call_done,
5496         .rpc_call_prepare = nfs41_sequence_prepare,
5497         .rpc_release = nfs41_sequence_release,
5498 };
5499
5500 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5501 {
5502         struct nfs4_sequence_data *calldata;
5503         struct rpc_message msg = {
5504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5505                 .rpc_cred = cred,
5506         };
5507         struct rpc_task_setup task_setup_data = {
5508                 .rpc_client = clp->cl_rpcclient,
5509                 .rpc_message = &msg,
5510                 .callback_ops = &nfs41_sequence_ops,
5511                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5512         };
5513
5514         if (!atomic_inc_not_zero(&clp->cl_count))
5515                 return ERR_PTR(-EIO);
5516         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5517         if (calldata == NULL) {
5518                 nfs_put_client(clp);
5519                 return ERR_PTR(-ENOMEM);
5520         }
5521         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5522         msg.rpc_argp = &calldata->args;
5523         msg.rpc_resp = &calldata->res;
5524         calldata->clp = clp;
5525         task_setup_data.callback_data = calldata;
5526
5527         return rpc_run_task(&task_setup_data);
5528 }
5529
5530 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5531 {
5532         struct rpc_task *task;
5533         int ret = 0;
5534
5535         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5536                 return 0;
5537         task = _nfs41_proc_sequence(clp, cred);
5538         if (IS_ERR(task))
5539                 ret = PTR_ERR(task);
5540         else
5541                 rpc_put_task_async(task);
5542         dprintk("<-- %s status=%d\n", __func__, ret);
5543         return ret;
5544 }
5545
5546 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5547 {
5548         struct rpc_task *task;
5549         int ret;
5550
5551         task = _nfs41_proc_sequence(clp, cred);
5552         if (IS_ERR(task)) {
5553                 ret = PTR_ERR(task);
5554                 goto out;
5555         }
5556         ret = rpc_wait_for_completion_task(task);
5557         if (!ret) {
5558                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5559
5560                 if (task->tk_status == 0)
5561                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5562                 ret = task->tk_status;
5563         }
5564         rpc_put_task(task);
5565 out:
5566         dprintk("<-- %s status=%d\n", __func__, ret);
5567         return ret;
5568 }
5569
5570 struct nfs4_reclaim_complete_data {
5571         struct nfs_client *clp;
5572         struct nfs41_reclaim_complete_args arg;
5573         struct nfs41_reclaim_complete_res res;
5574 };
5575
5576 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5577 {
5578         struct nfs4_reclaim_complete_data *calldata = data;
5579
5580         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5581         if (nfs41_setup_sequence(calldata->clp->cl_session,
5582                                 &calldata->arg.seq_args,
5583                                 &calldata->res.seq_res, task))
5584                 return;
5585
5586         rpc_call_start(task);
5587 }
5588
5589 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5590 {
5591         switch(task->tk_status) {
5592         case 0:
5593         case -NFS4ERR_COMPLETE_ALREADY:
5594         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5595                 break;
5596         case -NFS4ERR_DELAY:
5597                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5598                 /* fall through */
5599         case -NFS4ERR_RETRY_UNCACHED_REP:
5600                 return -EAGAIN;
5601         default:
5602                 nfs4_schedule_lease_recovery(clp);
5603         }
5604         return 0;
5605 }
5606
5607 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5608 {
5609         struct nfs4_reclaim_complete_data *calldata = data;
5610         struct nfs_client *clp = calldata->clp;
5611         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5612
5613         dprintk("--> %s\n", __func__);
5614         if (!nfs41_sequence_done(task, res))
5615                 return;
5616
5617         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5618                 rpc_restart_call_prepare(task);
5619                 return;
5620         }
5621         dprintk("<-- %s\n", __func__);
5622 }
5623
5624 static void nfs4_free_reclaim_complete_data(void *data)
5625 {
5626         struct nfs4_reclaim_complete_data *calldata = data;
5627
5628         kfree(calldata);
5629 }
5630
5631 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5632         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5633         .rpc_call_done = nfs4_reclaim_complete_done,
5634         .rpc_release = nfs4_free_reclaim_complete_data,
5635 };
5636
5637 /*
5638  * Issue a global reclaim complete.
5639  */
5640 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5641 {
5642         struct nfs4_reclaim_complete_data *calldata;
5643         struct rpc_task *task;
5644         struct rpc_message msg = {
5645                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5646         };
5647         struct rpc_task_setup task_setup_data = {
5648                 .rpc_client = clp->cl_rpcclient,
5649                 .rpc_message = &msg,
5650                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5651                 .flags = RPC_TASK_ASYNC,
5652         };
5653         int status = -ENOMEM;
5654
5655         dprintk("--> %s\n", __func__);
5656         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5657         if (calldata == NULL)
5658                 goto out;
5659         calldata->clp = clp;
5660         calldata->arg.one_fs = 0;
5661
5662         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5663         msg.rpc_argp = &calldata->arg;
5664         msg.rpc_resp = &calldata->res;
5665         task_setup_data.callback_data = calldata;
5666         task = rpc_run_task(&task_setup_data);
5667         if (IS_ERR(task)) {
5668                 status = PTR_ERR(task);
5669                 goto out;
5670         }
5671         status = nfs4_wait_for_completion_rpc_task(task);
5672         if (status == 0)
5673                 status = task->tk_status;
5674         rpc_put_task(task);
5675         return 0;
5676 out:
5677         dprintk("<-- %s status=%d\n", __func__, status);
5678         return status;
5679 }
5680
5681 static void
5682 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5683 {
5684         struct nfs4_layoutget *lgp = calldata;
5685         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5686
5687         dprintk("--> %s\n", __func__);
5688         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5689          * right now covering the LAYOUTGET we are about to send.
5690          * However, that is not so catastrophic, and there seems
5691          * to be no way to prevent it completely.
5692          */
5693         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5694                                 &lgp->res.seq_res, task))
5695                 return;
5696         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5697                                           NFS_I(lgp->args.inode)->layout,
5698                                           lgp->args.ctx->state)) {
5699                 rpc_exit(task, NFS4_OK);
5700                 return;
5701         }
5702         rpc_call_start(task);
5703 }
5704
5705 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5706 {
5707         struct nfs4_layoutget *lgp = calldata;
5708         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5709
5710         dprintk("--> %s\n", __func__);
5711
5712         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5713                 return;
5714
5715         switch (task->tk_status) {
5716         case 0:
5717                 break;
5718         case -NFS4ERR_LAYOUTTRYLATER:
5719         case -NFS4ERR_RECALLCONFLICT:
5720                 task->tk_status = -NFS4ERR_DELAY;
5721                 /* Fall through */
5722         default:
5723                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5724                         rpc_restart_call_prepare(task);
5725                         return;
5726                 }
5727         }
5728         dprintk("<-- %s\n", __func__);
5729 }
5730
5731 static void nfs4_layoutget_release(void *calldata)
5732 {
5733         struct nfs4_layoutget *lgp = calldata;
5734
5735         dprintk("--> %s\n", __func__);
5736         put_nfs_open_context(lgp->args.ctx);
5737         kfree(calldata);
5738         dprintk("<-- %s\n", __func__);
5739 }
5740
5741 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5742         .rpc_call_prepare = nfs4_layoutget_prepare,
5743         .rpc_call_done = nfs4_layoutget_done,
5744         .rpc_release = nfs4_layoutget_release,
5745 };
5746
5747 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5748 {
5749         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5750         struct rpc_task *task;
5751         struct rpc_message msg = {
5752                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5753                 .rpc_argp = &lgp->args,
5754                 .rpc_resp = &lgp->res,
5755         };
5756         struct rpc_task_setup task_setup_data = {
5757                 .rpc_client = server->client,
5758                 .rpc_message = &msg,
5759                 .callback_ops = &nfs4_layoutget_call_ops,
5760                 .callback_data = lgp,
5761                 .flags = RPC_TASK_ASYNC,
5762         };
5763         int status = 0;
5764
5765         dprintk("--> %s\n", __func__);
5766
5767         lgp->res.layoutp = &lgp->args.layout;
5768         lgp->res.seq_res.sr_slot = NULL;
5769         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
5770         task = rpc_run_task(&task_setup_data);
5771         if (IS_ERR(task))
5772                 return PTR_ERR(task);
5773         status = nfs4_wait_for_completion_rpc_task(task);
5774         if (status == 0)
5775                 status = task->tk_status;
5776         if (status == 0)
5777                 status = pnfs_layout_process(lgp);
5778         rpc_put_task(task);
5779         dprintk("<-- %s status=%d\n", __func__, status);
5780         return status;
5781 }
5782
5783 static void
5784 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5785 {
5786         struct nfs4_layoutreturn *lrp = calldata;
5787
5788         dprintk("--> %s\n", __func__);
5789         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5790                                 &lrp->res.seq_res, task))
5791                 return;
5792         rpc_call_start(task);
5793 }
5794
5795 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5796 {
5797         struct nfs4_layoutreturn *lrp = calldata;
5798         struct nfs_server *server;
5799         struct pnfs_layout_hdr *lo = lrp->args.layout;
5800
5801         dprintk("--> %s\n", __func__);
5802
5803         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5804                 return;
5805
5806         server = NFS_SERVER(lrp->args.inode);
5807         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5808                 rpc_restart_call_prepare(task);
5809                 return;
5810         }
5811         spin_lock(&lo->plh_inode->i_lock);
5812         if (task->tk_status == 0) {
5813                 if (lrp->res.lrs_present) {
5814                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5815                 } else
5816                         BUG_ON(!list_empty(&lo->plh_segs));
5817         }
5818         lo->plh_block_lgets--;
5819         spin_unlock(&lo->plh_inode->i_lock);
5820         dprintk("<-- %s\n", __func__);
5821 }
5822
5823 static void nfs4_layoutreturn_release(void *calldata)
5824 {
5825         struct nfs4_layoutreturn *lrp = calldata;
5826
5827         dprintk("--> %s\n", __func__);
5828         put_layout_hdr(lrp->args.layout);
5829         kfree(calldata);
5830         dprintk("<-- %s\n", __func__);
5831 }
5832
5833 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5834         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5835         .rpc_call_done = nfs4_layoutreturn_done,
5836         .rpc_release = nfs4_layoutreturn_release,
5837 };
5838
5839 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5840 {
5841         struct rpc_task *task;
5842         struct rpc_message msg = {
5843                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5844                 .rpc_argp = &lrp->args,
5845                 .rpc_resp = &lrp->res,
5846         };
5847         struct rpc_task_setup task_setup_data = {
5848                 .rpc_client = lrp->clp->cl_rpcclient,
5849                 .rpc_message = &msg,
5850                 .callback_ops = &nfs4_layoutreturn_call_ops,
5851                 .callback_data = lrp,
5852         };
5853         int status;
5854
5855         dprintk("--> %s\n", __func__);
5856         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
5857         task = rpc_run_task(&task_setup_data);
5858         if (IS_ERR(task))
5859                 return PTR_ERR(task);
5860         status = task->tk_status;
5861         dprintk("<-- %s status=%d\n", __func__, status);
5862         rpc_put_task(task);
5863         return status;
5864 }
5865
5866 /*
5867  * Retrieve the list of Data Server devices from the MDS.
5868  */
5869 static int _nfs4_getdevicelist(struct nfs_server *server,
5870                                     const struct nfs_fh *fh,
5871                                     struct pnfs_devicelist *devlist)
5872 {
5873         struct nfs4_getdevicelist_args args = {
5874                 .fh = fh,
5875                 .layoutclass = server->pnfs_curr_ld->id,
5876         };
5877         struct nfs4_getdevicelist_res res = {
5878                 .devlist = devlist,
5879         };
5880         struct rpc_message msg = {
5881                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5882                 .rpc_argp = &args,
5883                 .rpc_resp = &res,
5884         };
5885         int status;
5886
5887         dprintk("--> %s\n", __func__);
5888         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5889                                 &res.seq_res, 0);
5890         dprintk("<-- %s status=%d\n", __func__, status);
5891         return status;
5892 }
5893
5894 int nfs4_proc_getdevicelist(struct nfs_server *server,
5895                             const struct nfs_fh *fh,
5896                             struct pnfs_devicelist *devlist)
5897 {
5898         struct nfs4_exception exception = { };
5899         int err;
5900
5901         do {
5902                 err = nfs4_handle_exception(server,
5903                                 _nfs4_getdevicelist(server, fh, devlist),
5904                                 &exception);
5905         } while (exception.retry);
5906
5907         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5908                 err, devlist->num_devs);
5909
5910         return err;
5911 }
5912 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5913
5914 static int
5915 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5916 {
5917         struct nfs4_getdeviceinfo_args args = {
5918                 .pdev = pdev,
5919         };
5920         struct nfs4_getdeviceinfo_res res = {
5921                 .pdev = pdev,
5922         };
5923         struct rpc_message msg = {
5924                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5925                 .rpc_argp = &args,
5926                 .rpc_resp = &res,
5927         };
5928         int status;
5929
5930         dprintk("--> %s\n", __func__);
5931         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5932         dprintk("<-- %s status=%d\n", __func__, status);
5933
5934         return status;
5935 }
5936
5937 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5938 {
5939         struct nfs4_exception exception = { };
5940         int err;
5941
5942         do {
5943                 err = nfs4_handle_exception(server,
5944                                         _nfs4_proc_getdeviceinfo(server, pdev),
5945                                         &exception);
5946         } while (exception.retry);
5947         return err;
5948 }
5949 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5950
5951 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5952 {
5953         struct nfs4_layoutcommit_data *data = calldata;
5954         struct nfs_server *server = NFS_SERVER(data->args.inode);
5955
5956         if (nfs4_setup_sequence(server, &data->args.seq_args,
5957                                 &data->res.seq_res, task))
5958                 return;
5959         rpc_call_start(task);
5960 }
5961
5962 static void
5963 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5964 {
5965         struct nfs4_layoutcommit_data *data = calldata;
5966         struct nfs_server *server = NFS_SERVER(data->args.inode);
5967
5968         if (!nfs4_sequence_done(task, &data->res.seq_res))
5969                 return;
5970
5971         switch (task->tk_status) { /* Just ignore these failures */
5972         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5973         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5974         case NFS4ERR_BADLAYOUT:     /* no layout */
5975         case NFS4ERR_GRACE:         /* loca_recalim always false */
5976                 task->tk_status = 0;
5977         }
5978
5979         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5980                 rpc_restart_call_prepare(task);
5981                 return;
5982         }
5983
5984         if (task->tk_status == 0)
5985                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5986                                                    data->res.fattr);
5987 }
5988
5989 static void nfs4_layoutcommit_release(void *calldata)
5990 {
5991         struct nfs4_layoutcommit_data *data = calldata;
5992         struct pnfs_layout_segment *lseg, *tmp;
5993         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
5994
5995         pnfs_cleanup_layoutcommit(data);
5996         /* Matched by references in pnfs_set_layoutcommit */
5997         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5998                 list_del_init(&lseg->pls_lc_list);
5999                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6000                                        &lseg->pls_flags))
6001                         put_lseg(lseg);
6002         }
6003
6004         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6005         smp_mb__after_clear_bit();
6006         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6007
6008         put_rpccred(data->cred);
6009         kfree(data);
6010 }
6011
6012 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6013         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6014         .rpc_call_done = nfs4_layoutcommit_done,
6015         .rpc_release = nfs4_layoutcommit_release,
6016 };
6017
6018 int
6019 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6020 {
6021         struct rpc_message msg = {
6022                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6023                 .rpc_argp = &data->args,
6024                 .rpc_resp = &data->res,
6025                 .rpc_cred = data->cred,
6026         };
6027         struct rpc_task_setup task_setup_data = {
6028                 .task = &data->task,
6029                 .rpc_client = NFS_CLIENT(data->args.inode),
6030                 .rpc_message = &msg,
6031                 .callback_ops = &nfs4_layoutcommit_ops,
6032                 .callback_data = data,
6033                 .flags = RPC_TASK_ASYNC,
6034         };
6035         struct rpc_task *task;
6036         int status = 0;
6037
6038         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6039                 "lbw: %llu inode %lu\n",
6040                 data->task.tk_pid, sync,
6041                 data->args.lastbytewritten,
6042                 data->args.inode->i_ino);
6043
6044         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6045         task = rpc_run_task(&task_setup_data);
6046         if (IS_ERR(task))
6047                 return PTR_ERR(task);
6048         if (sync == false)
6049                 goto out;
6050         status = nfs4_wait_for_completion_rpc_task(task);
6051         if (status != 0)
6052                 goto out;
6053         status = task->tk_status;
6054 out:
6055         dprintk("%s: status %d\n", __func__, status);
6056         rpc_put_task(task);
6057         return status;
6058 }
6059
6060 static int
6061 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6062                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6063 {
6064         struct nfs41_secinfo_no_name_args args = {
6065                 .style = SECINFO_STYLE_CURRENT_FH,
6066         };
6067         struct nfs4_secinfo_res res = {
6068                 .flavors = flavors,
6069         };
6070         struct rpc_message msg = {
6071                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6072                 .rpc_argp = &args,
6073                 .rpc_resp = &res,
6074         };
6075         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6076 }
6077
6078 static int
6079 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6080                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6081 {
6082         struct nfs4_exception exception = { };
6083         int err;
6084         do {
6085                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6086                 switch (err) {
6087                 case 0:
6088                 case -NFS4ERR_WRONGSEC:
6089                 case -NFS4ERR_NOTSUPP:
6090                         break;
6091                 default:
6092                         err = nfs4_handle_exception(server, err, &exception);
6093                 }
6094         } while (exception.retry);
6095         return err;
6096 }
6097
6098 static int
6099 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6100                     struct nfs_fsinfo *info)
6101 {
6102         int err;
6103         struct page *page;
6104         rpc_authflavor_t flavor;
6105         struct nfs4_secinfo_flavors *flavors;
6106
6107         page = alloc_page(GFP_KERNEL);
6108         if (!page) {
6109                 err = -ENOMEM;
6110                 goto out;
6111         }
6112
6113         flavors = page_address(page);
6114         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6115
6116         /*
6117          * Fall back on "guess and check" method if
6118          * the server doesn't support SECINFO_NO_NAME
6119          */
6120         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6121                 err = nfs4_find_root_sec(server, fhandle, info);
6122                 goto out_freepage;
6123         }
6124         if (err)
6125                 goto out_freepage;
6126
6127         flavor = nfs_find_best_sec(flavors);
6128         if (err == 0)
6129                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6130
6131 out_freepage:
6132         put_page(page);
6133         if (err == -EACCES)
6134                 return -EPERM;
6135 out:
6136         return err;
6137 }
6138 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6139 {
6140         struct nfs41_test_stateid_args args = {
6141                 .stateid = &state->stateid,
6142         };
6143         struct nfs41_test_stateid_res res;
6144         struct rpc_message msg = {
6145                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6146                 .rpc_argp = &args,
6147                 .rpc_resp = &res,
6148         };
6149         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6150         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6151 }
6152
6153 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6154 {
6155         struct nfs4_exception exception = { };
6156         int err;
6157         do {
6158                 err = nfs4_handle_exception(server,
6159                                 _nfs41_test_stateid(server, state),
6160                                 &exception);
6161         } while (exception.retry);
6162         return err;
6163 }
6164
6165 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6166 {
6167         struct nfs41_free_stateid_args args = {
6168                 .stateid = &state->stateid,
6169         };
6170         struct nfs41_free_stateid_res res;
6171         struct rpc_message msg = {
6172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6173                 .rpc_argp = &args,
6174                 .rpc_resp = &res,
6175         };
6176
6177         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6178         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6179 }
6180
6181 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6182 {
6183         struct nfs4_exception exception = { };
6184         int err;
6185         do {
6186                 err = nfs4_handle_exception(server,
6187                                 _nfs4_free_stateid(server, state),
6188                                 &exception);
6189         } while (exception.retry);
6190         return err;
6191 }
6192 #endif /* CONFIG_NFS_V4_1 */
6193
6194 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6195         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6196         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6197         .recover_open   = nfs4_open_reclaim,
6198         .recover_lock   = nfs4_lock_reclaim,
6199         .establish_clid = nfs4_init_clientid,
6200         .get_clid_cred  = nfs4_get_setclientid_cred,
6201 };
6202
6203 #if defined(CONFIG_NFS_V4_1)
6204 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6205         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6206         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6207         .recover_open   = nfs4_open_reclaim,
6208         .recover_lock   = nfs4_lock_reclaim,
6209         .establish_clid = nfs41_init_clientid,
6210         .get_clid_cred  = nfs4_get_exchange_id_cred,
6211         .reclaim_complete = nfs41_proc_reclaim_complete,
6212 };
6213 #endif /* CONFIG_NFS_V4_1 */
6214
6215 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6216         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6217         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6218         .recover_open   = nfs4_open_expired,
6219         .recover_lock   = nfs4_lock_expired,
6220         .establish_clid = nfs4_init_clientid,
6221         .get_clid_cred  = nfs4_get_setclientid_cred,
6222 };
6223
6224 #if defined(CONFIG_NFS_V4_1)
6225 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6226         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6227         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6228         .recover_open   = nfs41_open_expired,
6229         .recover_lock   = nfs41_lock_expired,
6230         .establish_clid = nfs41_init_clientid,
6231         .get_clid_cred  = nfs4_get_exchange_id_cred,
6232 };
6233 #endif /* CONFIG_NFS_V4_1 */
6234
6235 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6236         .sched_state_renewal = nfs4_proc_async_renew,
6237         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6238         .renew_lease = nfs4_proc_renew,
6239 };
6240
6241 #if defined(CONFIG_NFS_V4_1)
6242 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6243         .sched_state_renewal = nfs41_proc_async_sequence,
6244         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6245         .renew_lease = nfs4_proc_sequence,
6246 };
6247 #endif
6248
6249 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6250         .minor_version = 0,
6251         .call_sync = _nfs4_call_sync,
6252         .validate_stateid = nfs4_validate_delegation_stateid,
6253         .find_root_sec = nfs4_find_root_sec,
6254         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6255         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6256         .state_renewal_ops = &nfs40_state_renewal_ops,
6257 };
6258
6259 #if defined(CONFIG_NFS_V4_1)
6260 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6261         .minor_version = 1,
6262         .call_sync = _nfs4_call_sync_session,
6263         .validate_stateid = nfs41_validate_delegation_stateid,
6264         .find_root_sec = nfs41_find_root_sec,
6265         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6266         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6267         .state_renewal_ops = &nfs41_state_renewal_ops,
6268 };
6269 #endif
6270
6271 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6272         [0] = &nfs_v4_0_minor_ops,
6273 #if defined(CONFIG_NFS_V4_1)
6274         [1] = &nfs_v4_1_minor_ops,
6275 #endif
6276 };
6277
6278 static const struct inode_operations nfs4_file_inode_operations = {
6279         .permission     = nfs_permission,
6280         .getattr        = nfs_getattr,
6281         .setattr        = nfs_setattr,
6282         .getxattr       = generic_getxattr,
6283         .setxattr       = generic_setxattr,
6284         .listxattr      = generic_listxattr,
6285         .removexattr    = generic_removexattr,
6286 };
6287
6288 const struct nfs_rpc_ops nfs_v4_clientops = {
6289         .version        = 4,                    /* protocol version */
6290         .dentry_ops     = &nfs4_dentry_operations,
6291         .dir_inode_ops  = &nfs4_dir_inode_operations,
6292         .file_inode_ops = &nfs4_file_inode_operations,
6293         .file_ops       = &nfs4_file_operations,
6294         .getroot        = nfs4_proc_get_root,
6295         .getattr        = nfs4_proc_getattr,
6296         .setattr        = nfs4_proc_setattr,
6297         .lookup         = nfs4_proc_lookup,
6298         .access         = nfs4_proc_access,
6299         .readlink       = nfs4_proc_readlink,
6300         .create         = nfs4_proc_create,
6301         .remove         = nfs4_proc_remove,
6302         .unlink_setup   = nfs4_proc_unlink_setup,
6303         .unlink_done    = nfs4_proc_unlink_done,
6304         .rename         = nfs4_proc_rename,
6305         .rename_setup   = nfs4_proc_rename_setup,
6306         .rename_done    = nfs4_proc_rename_done,
6307         .link           = nfs4_proc_link,
6308         .symlink        = nfs4_proc_symlink,
6309         .mkdir          = nfs4_proc_mkdir,
6310         .rmdir          = nfs4_proc_remove,
6311         .readdir        = nfs4_proc_readdir,
6312         .mknod          = nfs4_proc_mknod,
6313         .statfs         = nfs4_proc_statfs,
6314         .fsinfo         = nfs4_proc_fsinfo,
6315         .pathconf       = nfs4_proc_pathconf,
6316         .set_capabilities = nfs4_server_capabilities,
6317         .decode_dirent  = nfs4_decode_dirent,
6318         .read_setup     = nfs4_proc_read_setup,
6319         .read_done      = nfs4_read_done,
6320         .write_setup    = nfs4_proc_write_setup,
6321         .write_done     = nfs4_write_done,
6322         .commit_setup   = nfs4_proc_commit_setup,
6323         .commit_done    = nfs4_commit_done,
6324         .lock           = nfs4_proc_lock,
6325         .clear_acl_cache = nfs4_zap_acl_attr,
6326         .close_context  = nfs4_close_context,
6327         .open_context   = nfs4_atomic_open,
6328         .init_client    = nfs4_init_client,
6329         .secinfo        = nfs4_proc_secinfo,
6330 };
6331
6332 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6333         .prefix = XATTR_NAME_NFSV4_ACL,
6334         .list   = nfs4_xattr_list_nfs4_acl,
6335         .get    = nfs4_xattr_get_nfs4_acl,
6336         .set    = nfs4_xattr_set_nfs4_acl,
6337 };
6338
6339 const struct xattr_handler *nfs4_xattr_handlers[] = {
6340         &nfs4_xattr_nfs4_acl_handler,
6341         NULL
6342 };
6343
6344 /*
6345  * Local variables:
6346  *  c-basic-offset: 8
6347  * End:
6348  */