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 *, nfs4_stateid *);
  86 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  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 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 389 {
 390         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 391         return true;
 392 }
 393
 394 /*
 395  * Signal state manager thread if session fore channel is drained
 396  */
 397 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 398 {
 399         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 400                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 401                                 nfs4_set_task_privileged, NULL);
 402                 return;
 403         }
 404
 405         if (ses->fc_slot_table.highest_used_slotid != -1)
 406                 return;
 407
 408         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 409         complete(&ses->fc_slot_table.complete);
 410 }
 411
 412 /*
 413  * Signal state manager thread if session back channel is drained
 414  */
 415 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 416 {
 417         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 418             ses->bc_slot_table.highest_used_slotid != -1)
 419                 return;
 420         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 421         complete(&ses->bc_slot_table.complete);
 422 }
 423
 424 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 425 {
 426         struct nfs4_slot_table *tbl;
 427
 428         tbl = &res->sr_session->fc_slot_table;
 429         if (!res->sr_slot) {
 430                 /* just wake up the next guy waiting since
 431                  * we may have not consumed a slot after all */
 432                 dprintk("%s: No slot\n", __func__);
 433                 return;
 434         }
 435
 436         spin_lock(&tbl->slot_tbl_lock);
 437         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 438         nfs4_check_drain_fc_complete(res->sr_session);
 439         spin_unlock(&tbl->slot_tbl_lock);
 440         res->sr_slot = NULL;
 441 }
 442
 443 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 444 {
 445         unsigned long timestamp;
 446         struct nfs_client *clp;
 447
 448         /*
 449          * sr_status remains 1 if an RPC level error occurred. The server
 450          * may or may not have processed the sequence operation..
 451          * Proceed as if the server received and processed the sequence
 452          * operation.
 453          */
 454         if (res->sr_status == 1)
 455                 res->sr_status = NFS_OK;
 456
 457         /* don't increment the sequence number if the task wasn't sent */
 458         if (!RPC_WAS_SENT(task))
 459                 goto out;
 460
 461         /* Check the SEQUENCE operation status */
 462         switch (res->sr_status) {
 463         case 0:
 464                 /* Update the slot's sequence and clientid lease timer */
 465                 ++res->sr_slot->seq_nr;
 466                 timestamp = res->sr_renewal_time;
 467                 clp = res->sr_session->clp;
 468                 do_renew_lease(clp, timestamp);
 469                 /* Check sequence flags */
 470                 if (res->sr_status_flags != 0)
 471                         nfs4_schedule_lease_recovery(clp);
 472                 break;
 473         case -NFS4ERR_DELAY:
 474                 /* The server detected a resend of the RPC call and
 475                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 476                  * of RFC5661.
 477                  */
 478                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 479                         __func__,
 480                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 481                         res->sr_slot->seq_nr);
 482                 goto out_retry;
 483         default:
 484                 /* Just update the slot sequence no. */
 485                 ++res->sr_slot->seq_nr;
 486         }
 487 out:
 488         /* The session may be reset by one of the error handlers. */
 489         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 490         nfs41_sequence_free_slot(res);
 491         return 1;
 492 out_retry:
 493         if (!rpc_restart_call(task))
 494                 goto out;
 495         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 496         return 0;
 497 }
 498
 499 static int nfs4_sequence_done(struct rpc_task *task,
 500                                struct nfs4_sequence_res *res)
 501 {
 502         if (res->sr_session == NULL)
 503                 return 1;
 504         return nfs41_sequence_done(task, res);
 505 }
 506
 507 /*
 508  * nfs4_find_slot - efficiently look for a free slot
 509  *
 510  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 511  * If found, we mark the slot as used, update the highest_used_slotid,
 512  * and respectively set up the sequence operation args.
 513  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 514  *
 515  * Note: must be called with under the slot_tbl_lock.
 516  */
 517 static u8
 518 nfs4_find_slot(struct nfs4_slot_table *tbl)
 519 {
 520         int slotid;
 521         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 522         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 523
 524         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 525                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 526                 tbl->max_slots);
 527         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 528         if (slotid >= tbl->max_slots)
 529                 goto out;
 530         __set_bit(slotid, tbl->used_slots);
 531         if (slotid > tbl->highest_used_slotid)
 532                 tbl->highest_used_slotid = slotid;
 533         ret_id = slotid;
 534 out:
 535         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 536                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 537         return ret_id;
 538 }
 539
 540 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 541                 struct nfs4_sequence_res *res, int cache_reply)
 542 {
 543         args->sa_session = NULL;
 544         args->sa_cache_this = 0;
 545         if (cache_reply)
 546                 args->sa_cache_this = 1;
 547         res->sr_session = NULL;
 548         res->sr_slot = NULL;
 549 }
 550
 551 int nfs41_setup_sequence(struct nfs4_session *session,
 552                                 struct nfs4_sequence_args *args,
 553                                 struct nfs4_sequence_res *res,
 554                                 struct rpc_task *task)
 555 {
 556         struct nfs4_slot *slot;
 557         struct nfs4_slot_table *tbl;
 558         u8 slotid;
 559
 560         dprintk("--> %s\n", __func__);
 561         /* slot already allocated? */
 562         if (res->sr_slot != NULL)
 563                 return 0;
 564
 565         tbl = &session->fc_slot_table;
 566
 567         spin_lock(&tbl->slot_tbl_lock);
 568         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 569             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 570                 /* The state manager will wait until the slot table is empty */
 571                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 572                 spin_unlock(&tbl->slot_tbl_lock);
 573                 dprintk("%s session is draining\n", __func__);
 574                 return -EAGAIN;
 575         }
 576
 577         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 578             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 579                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 580                 spin_unlock(&tbl->slot_tbl_lock);
 581                 dprintk("%s enforce FIFO order\n", __func__);
 582                 return -EAGAIN;
 583         }
 584
 585         slotid = nfs4_find_slot(tbl);
 586         if (slotid == NFS4_MAX_SLOT_TABLE) {
 587                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 588                 spin_unlock(&tbl->slot_tbl_lock);
 589                 dprintk("<-- %s: no free slots\n", __func__);
 590                 return -EAGAIN;
 591         }
 592         spin_unlock(&tbl->slot_tbl_lock);
 593
 594         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 595         slot = tbl->slots + slotid;
 596         args->sa_session = session;
 597         args->sa_slotid = slotid;
 598
 599         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 600
 601         res->sr_session = session;
 602         res->sr_slot = slot;
 603         res->sr_renewal_time = jiffies;
 604         res->sr_status_flags = 0;
 605         /*
 606          * sr_status is only set in decode_sequence, and so will remain
 607          * set to 1 if an rpc level failure occurs.
 608          */
 609         res->sr_status = 1;
 610         return 0;
 611 }
 612 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 613
 614 int nfs4_setup_sequence(const struct nfs_server *server,
 615                         struct nfs4_sequence_args *args,
 616                         struct nfs4_sequence_res *res,
 617                         struct rpc_task *task)
 618 {
 619         struct nfs4_session *session = nfs4_get_session(server);
 620         int ret = 0;
 621
 622         if (session == NULL)
 623                 goto out;
 624
 625         dprintk("--> %s clp %p session %p sr_slot %td\n",
 626                 __func__, session->clp, session, res->sr_slot ?
 627                         res->sr_slot - session->fc_slot_table.slots : -1);
 628
 629         ret = nfs41_setup_sequence(session, args, res, task);
 630 out:
 631         dprintk("<-- %s status=%d\n", __func__, ret);
 632         return ret;
 633 }
 634
 635 struct nfs41_call_sync_data {
 636         const struct nfs_server *seq_server;
 637         struct nfs4_sequence_args *seq_args;
 638         struct nfs4_sequence_res *seq_res;
 639 };
 640
 641 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 642 {
 643         struct nfs41_call_sync_data *data = calldata;
 644
 645         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 646
 647         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 648                                 data->seq_res, task))
 649                 return;
 650         rpc_call_start(task);
 651 }
 652
 653 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 654 {
 655         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 656         nfs41_call_sync_prepare(task, calldata);
 657 }
 658
 659 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 660 {
 661         struct nfs41_call_sync_data *data = calldata;
 662
 663         nfs41_sequence_done(task, data->seq_res);
 664 }
 665
 666 struct rpc_call_ops nfs41_call_sync_ops = {
 667         .rpc_call_prepare = nfs41_call_sync_prepare,
 668         .rpc_call_done = nfs41_call_sync_done,
 669 };
 670
 671 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 672         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 673         .rpc_call_done = nfs41_call_sync_done,
 674 };
 675
 676 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 677                                    struct nfs_server *server,
 678                                    struct rpc_message *msg,
 679                                    struct nfs4_sequence_args *args,
 680                                    struct nfs4_sequence_res *res,
 681                                    int privileged)
 682 {
 683         int ret;
 684         struct rpc_task *task;
 685         struct nfs41_call_sync_data data = {
 686                 .seq_server = server,
 687                 .seq_args = args,
 688                 .seq_res = res,
 689         };
 690         struct rpc_task_setup task_setup = {
 691                 .rpc_client = clnt,
 692                 .rpc_message = msg,
 693                 .callback_ops = &nfs41_call_sync_ops,
 694                 .callback_data = &data
 695         };
 696
 697         if (privileged)
 698                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 699         task = rpc_run_task(&task_setup);
 700         if (IS_ERR(task))
 701                 ret = PTR_ERR(task);
 702         else {
 703                 ret = task->tk_status;
 704                 rpc_put_task(task);
 705         }
 706         return ret;
 707 }
 708
 709 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 710                             struct nfs_server *server,
 711                             struct rpc_message *msg,
 712                             struct nfs4_sequence_args *args,
 713                             struct nfs4_sequence_res *res,
 714                             int cache_reply)
 715 {
 716         nfs41_init_sequence(args, res, cache_reply);
 717         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 718 }
 719
 720 #else
 721 static inline
 722 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 723                 struct nfs4_sequence_res *res, int cache_reply)
 724 {
 725 }
 726
 727 static int nfs4_sequence_done(struct rpc_task *task,
 728                                struct nfs4_sequence_res *res)
 729 {
 730         return 1;
 731 }
 732 #endif /* CONFIG_NFS_V4_1 */
 733
 734 int _nfs4_call_sync(struct rpc_clnt *clnt,
 735                     struct nfs_server *server,
 736                     struct rpc_message *msg,
 737                     struct nfs4_sequence_args *args,
 738                     struct nfs4_sequence_res *res,
 739                     int cache_reply)
 740 {
 741         nfs41_init_sequence(args, res, cache_reply);
 742         return rpc_call_sync(clnt, msg, 0);
 743 }
 744
 745 static inline
 746 int nfs4_call_sync(struct rpc_clnt *clnt,
 747                    struct nfs_server *server,
 748                    struct rpc_message *msg,
 749                    struct nfs4_sequence_args *args,
 750                    struct nfs4_sequence_res *res,
 751                    int cache_reply)
 752 {
 753         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 754                                                 args, res, cache_reply);
 755 }
 756
 757 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 758 {
 759         struct nfs_inode *nfsi = NFS_I(dir);
 760
 761         spin_lock(&dir->i_lock);
 762         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 763         if (!cinfo->atomic || cinfo->before != dir->i_version)
 764                 nfs_force_lookup_revalidate(dir);
 765         dir->i_version = cinfo->after;
 766         spin_unlock(&dir->i_lock);
 767 }
 768
 769 struct nfs4_opendata {
 770         struct kref kref;
 771         struct nfs_openargs o_arg;
 772         struct nfs_openres o_res;
 773         struct nfs_open_confirmargs c_arg;
 774         struct nfs_open_confirmres c_res;
 775         struct nfs4_string owner_name;
 776         struct nfs4_string group_name;
 777         struct nfs_fattr f_attr;
 778         struct nfs_fattr dir_attr;
 779         struct dentry *dir;
 780         struct dentry *dentry;
 781         struct nfs4_state_owner *owner;
 782         struct nfs4_state *state;
 783         struct iattr attrs;
 784         unsigned long timestamp;
 785         unsigned int rpc_done : 1;
 786         int rpc_status;
 787         int cancelled;
 788 };
 789
 790
 791 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 792 {
 793         p->o_res.f_attr = &p->f_attr;
 794         p->o_res.dir_attr = &p->dir_attr;
 795         p->o_res.seqid = p->o_arg.seqid;
 796         p->c_res.seqid = p->c_arg.seqid;
 797         p->o_res.server = p->o_arg.server;
 798         nfs_fattr_init(&p->f_attr);
 799         nfs_fattr_init(&p->dir_attr);
 800         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 801 }
 802
 803 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 804                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 805                 const struct iattr *attrs,
 806                 gfp_t gfp_mask)
 807 {
 808         struct dentry *parent = dget_parent(dentry);
 809         struct inode *dir = parent->d_inode;
 810         struct nfs_server *server = NFS_SERVER(dir);
 811         struct nfs4_opendata *p;
 812
 813         p = kzalloc(sizeof(*p), gfp_mask);
 814         if (p == NULL)
 815                 goto err;
 816         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 817         if (p->o_arg.seqid == NULL)
 818                 goto err_free;
 819         nfs_sb_active(dentry->d_sb);
 820         p->dentry = dget(dentry);
 821         p->dir = parent;
 822         p->owner = sp;
 823         atomic_inc(&sp->so_count);
 824         p->o_arg.fh = NFS_FH(dir);
 825         p->o_arg.open_flags = flags;
 826         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 827         p->o_arg.clientid = server->nfs_client->cl_clientid;
 828         p->o_arg.id = sp->so_seqid.owner_id;
 829         p->o_arg.name = &dentry->d_name;
 830         p->o_arg.server = server;
 831         p->o_arg.bitmask = server->attr_bitmask;
 832         p->o_arg.dir_bitmask = server->cache_consistency_bitmask;
 833         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 834         if (attrs != NULL && attrs->ia_valid != 0) {
 835                 u32 *s;
 836
 837                 p->o_arg.u.attrs = &p->attrs;
 838                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 839                 s = (u32 *) p->o_arg.u.verifier.data;
 840                 s[0] = jiffies;
 841                 s[1] = current->pid;
 842         }
 843         p->c_arg.fh = &p->o_res.fh;
 844         p->c_arg.stateid = &p->o_res.stateid;
 845         p->c_arg.seqid = p->o_arg.seqid;
 846         nfs4_init_opendata_res(p);
 847         kref_init(&p->kref);
 848         return p;
 849 err_free:
 850         kfree(p);
 851 err:
 852         dput(parent);
 853         return NULL;
 854 }
 855
 856 static void nfs4_opendata_free(struct kref *kref)
 857 {
 858         struct nfs4_opendata *p = container_of(kref,
 859                         struct nfs4_opendata, kref);
 860         struct super_block *sb = p->dentry->d_sb;
 861
 862         nfs_free_seqid(p->o_arg.seqid);
 863         if (p->state != NULL)
 864                 nfs4_put_open_state(p->state);
 865         nfs4_put_state_owner(p->owner);
 866         dput(p->dir);
 867         dput(p->dentry);
 868         nfs_sb_deactive(sb);
 869         nfs_fattr_free_names(&p->f_attr);
 870         kfree(p);
 871 }
 872
 873 static void nfs4_opendata_put(struct nfs4_opendata *p)
 874 {
 875         if (p != NULL)
 876                 kref_put(&p->kref, nfs4_opendata_free);
 877 }
 878
 879 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 880 {
 881         int ret;
 882
 883         ret = rpc_wait_for_completion_task(task);
 884         return ret;
 885 }
 886
 887 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 888 {
 889         int ret = 0;
 890
 891         if (open_mode & (O_EXCL|O_TRUNC))
 892                 goto out;
 893         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 894                 case FMODE_READ:
 895                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 896                                 && state->n_rdonly != 0;
 897                         break;
 898                 case FMODE_WRITE:
 899                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 900                                 && state->n_wronly != 0;
 901                         break;
 902                 case FMODE_READ|FMODE_WRITE:
 903                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 904                                 && state->n_rdwr != 0;
 905         }
 906 out:
 907         return ret;
 908 }
 909
 910 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 911 {
 912         if (delegation == NULL)
 913                 return 0;
 914         if ((delegation->type & fmode) != fmode)
 915                 return 0;
 916         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 917                 return 0;
 918         nfs_mark_delegation_referenced(delegation);
 919         return 1;
 920 }
 921
 922 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 923 {
 924         switch (fmode) {
 925                 case FMODE_WRITE:
 926                         state->n_wronly++;
 927                         break;
 928                 case FMODE_READ:
 929                         state->n_rdonly++;
 930                         break;
 931                 case FMODE_READ|FMODE_WRITE:
 932                         state->n_rdwr++;
 933         }
 934         nfs4_state_set_mode_locked(state, state->state | fmode);
 935 }
 936
 937 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 938 {
 939         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 940                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 941         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 942         switch (fmode) {
 943                 case FMODE_READ:
 944                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 945                         break;
 946                 case FMODE_WRITE:
 947                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 948                         break;
 949                 case FMODE_READ|FMODE_WRITE:
 950                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 951         }
 952 }
 953
 954 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 955 {
 956         write_seqlock(&state->seqlock);
 957         nfs_set_open_stateid_locked(state, stateid, fmode);
 958         write_sequnlock(&state->seqlock);
 959 }
 960
 961 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 962 {
 963         /*
 964          * Protect the call to nfs4_state_set_mode_locked and
 965          * serialise the stateid update
 966          */
 967         write_seqlock(&state->seqlock);
 968         if (deleg_stateid != NULL) {
 969                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 970                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 971         }
 972         if (open_stateid != NULL)
 973                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 974         write_sequnlock(&state->seqlock);
 975         spin_lock(&state->owner->so_lock);
 976         update_open_stateflags(state, fmode);
 977         spin_unlock(&state->owner->so_lock);
 978 }
 979
 980 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 981 {
 982         struct nfs_inode *nfsi = NFS_I(state->inode);
 983         struct nfs_delegation *deleg_cur;
 984         int ret = 0;
 985
 986         fmode &= (FMODE_READ|FMODE_WRITE);
 987
 988         rcu_read_lock();
 989         deleg_cur = rcu_dereference(nfsi->delegation);
 990         if (deleg_cur == NULL)
 991                 goto no_delegation;
 992
 993         spin_lock(&deleg_cur->lock);
 994         if (nfsi->delegation != deleg_cur ||
 995             (deleg_cur->type & fmode) != fmode)
 996                 goto no_delegation_unlock;
 997
 998         if (delegation == NULL)
 999                 delegation = &deleg_cur->stateid;
1000         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
1001                 goto no_delegation_unlock;
1002
1003         nfs_mark_delegation_referenced(deleg_cur);
1004         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1005         ret = 1;
1006 no_delegation_unlock:
1007         spin_unlock(&deleg_cur->lock);
1008 no_delegation:
1009         rcu_read_unlock();
1010
1011         if (!ret && open_stateid != NULL) {
1012                 __update_open_stateid(state, open_stateid, NULL, fmode);
1013                 ret = 1;
1014         }
1015
1016         return ret;
1017 }
1018
1019
1020 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1021 {
1022         struct nfs_delegation *delegation;
1023
1024         rcu_read_lock();
1025         delegation = rcu_dereference(NFS_I(inode)->delegation);
1026         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1027                 rcu_read_unlock();
1028                 return;
1029         }
1030         rcu_read_unlock();
1031         nfs_inode_return_delegation(inode);
1032 }
1033
1034 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1035 {
1036         struct nfs4_state *state = opendata->state;
1037         struct nfs_inode *nfsi = NFS_I(state->inode);
1038         struct nfs_delegation *delegation;
1039         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1040         fmode_t fmode = opendata->o_arg.fmode;
1041         nfs4_stateid stateid;
1042         int ret = -EAGAIN;
1043
1044         for (;;) {
1045                 if (can_open_cached(state, fmode, open_mode)) {
1046                         spin_lock(&state->owner->so_lock);
1047                         if (can_open_cached(state, fmode, open_mode)) {
1048                                 update_open_stateflags(state, fmode);
1049                                 spin_unlock(&state->owner->so_lock);
1050                                 goto out_return_state;
1051                         }
1052                         spin_unlock(&state->owner->so_lock);
1053                 }
1054                 rcu_read_lock();
1055                 delegation = rcu_dereference(nfsi->delegation);
1056                 if (!can_open_delegated(delegation, fmode)) {
1057                         rcu_read_unlock();
1058                         break;
1059                 }
1060                 /* Save the delegation */
1061                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1062                 rcu_read_unlock();
1063                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1064                 if (ret != 0)
1065                         goto out;
1066                 ret = -EAGAIN;
1067
1068                 /* Try to update the stateid using the delegation */
1069                 if (update_open_stateid(state, NULL, &stateid, fmode))
1070                         goto out_return_state;
1071         }
1072 out:
1073         return ERR_PTR(ret);
1074 out_return_state:
1075         atomic_inc(&state->count);
1076         return state;
1077 }
1078
1079 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1080 {
1081         struct inode *inode;
1082         struct nfs4_state *state = NULL;
1083         struct nfs_delegation *delegation;
1084         int ret;
1085
1086         if (!data->rpc_done) {
1087                 state = nfs4_try_open_cached(data);
1088                 goto out;
1089         }
1090
1091         ret = -EAGAIN;
1092         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1093                 goto err;
1094         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1095         ret = PTR_ERR(inode);
1096         if (IS_ERR(inode))
1097                 goto err;
1098         ret = -ENOMEM;
1099         state = nfs4_get_open_state(inode, data->owner);
1100         if (state == NULL)
1101                 goto err_put_inode;
1102         if (data->o_res.delegation_type != 0) {
1103                 int delegation_flags = 0;
1104
1105                 rcu_read_lock();
1106                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1107                 if (delegation)
1108                         delegation_flags = delegation->flags;
1109                 rcu_read_unlock();
1110                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1111                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1112                                         "returning a delegation for "
1113                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1114                                         NFS_CLIENT(inode)->cl_server);
1115                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1116                         nfs_inode_set_delegation(state->inode,
1117                                         data->owner->so_cred,
1118                                         &data->o_res);
1119                 else
1120                         nfs_inode_reclaim_delegation(state->inode,
1121                                         data->owner->so_cred,
1122                                         &data->o_res);
1123         }
1124
1125         update_open_stateid(state, &data->o_res.stateid, NULL,
1126                         data->o_arg.fmode);
1127         iput(inode);
1128 out:
1129         return state;
1130 err_put_inode:
1131         iput(inode);
1132 err:
1133         return ERR_PTR(ret);
1134 }
1135
1136 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1137 {
1138         struct nfs_inode *nfsi = NFS_I(state->inode);
1139         struct nfs_open_context *ctx;
1140
1141         spin_lock(&state->inode->i_lock);
1142         list_for_each_entry(ctx, &nfsi->open_files, list) {
1143                 if (ctx->state != state)
1144                         continue;
1145                 get_nfs_open_context(ctx);
1146                 spin_unlock(&state->inode->i_lock);
1147                 return ctx;
1148         }
1149         spin_unlock(&state->inode->i_lock);
1150         return ERR_PTR(-ENOENT);
1151 }
1152
1153 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1154 {
1155         struct nfs4_opendata *opendata;
1156
1157         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1158         if (opendata == NULL)
1159                 return ERR_PTR(-ENOMEM);
1160         opendata->state = state;
1161         atomic_inc(&state->count);
1162         return opendata;
1163 }
1164
1165 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1166 {
1167         struct nfs4_state *newstate;
1168         int ret;
1169
1170         opendata->o_arg.open_flags = 0;
1171         opendata->o_arg.fmode = fmode;
1172         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1173         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1174         nfs4_init_opendata_res(opendata);
1175         ret = _nfs4_recover_proc_open(opendata);
1176         if (ret != 0)
1177                 return ret;
1178         newstate = nfs4_opendata_to_nfs4_state(opendata);
1179         if (IS_ERR(newstate))
1180                 return PTR_ERR(newstate);
1181         nfs4_close_state(newstate, fmode);
1182         *res = newstate;
1183         return 0;
1184 }
1185
1186 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1187 {
1188         struct nfs4_state *newstate;
1189         int ret;
1190
1191         /* memory barrier prior to reading state->n_* */
1192         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1193         smp_rmb();
1194         if (state->n_rdwr != 0) {
1195                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1196                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1197                 if (ret != 0)
1198                         return ret;
1199                 if (newstate != state)
1200                         return -ESTALE;
1201         }
1202         if (state->n_wronly != 0) {
1203                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1204                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1205                 if (ret != 0)
1206                         return ret;
1207                 if (newstate != state)
1208                         return -ESTALE;
1209         }
1210         if (state->n_rdonly != 0) {
1211                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1212                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1213                 if (ret != 0)
1214                         return ret;
1215                 if (newstate != state)
1216                         return -ESTALE;
1217         }
1218         /*
1219          * We may have performed cached opens for all three recoveries.
1220          * Check if we need to update the current stateid.
1221          */
1222         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1223             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1224                 write_seqlock(&state->seqlock);
1225                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1226                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1227                 write_sequnlock(&state->seqlock);
1228         }
1229         return 0;
1230 }
1231
1232 /*
1233  * OPEN_RECLAIM:
1234  *      reclaim state on the server after a reboot.
1235  */
1236 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1237 {
1238         struct nfs_delegation *delegation;
1239         struct nfs4_opendata *opendata;
1240         fmode_t delegation_type = 0;
1241         int status;
1242
1243         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1244         if (IS_ERR(opendata))
1245                 return PTR_ERR(opendata);
1246         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1247         opendata->o_arg.fh = NFS_FH(state->inode);
1248         rcu_read_lock();
1249         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1250         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1251                 delegation_type = delegation->type;
1252         rcu_read_unlock();
1253         opendata->o_arg.u.delegation_type = delegation_type;
1254         status = nfs4_open_recover(opendata, state);
1255         nfs4_opendata_put(opendata);
1256         return status;
1257 }
1258
1259 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1260 {
1261         struct nfs_server *server = NFS_SERVER(state->inode);
1262         struct nfs4_exception exception = { };
1263         int err;
1264         do {
1265                 err = _nfs4_do_open_reclaim(ctx, state);
1266                 if (err != -NFS4ERR_DELAY)
1267                         break;
1268                 nfs4_handle_exception(server, err, &exception);
1269         } while (exception.retry);
1270         return err;
1271 }
1272
1273 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1274 {
1275         struct nfs_open_context *ctx;
1276         int ret;
1277
1278         ctx = nfs4_state_find_open_context(state);
1279         if (IS_ERR(ctx))
1280                 return PTR_ERR(ctx);
1281         ret = nfs4_do_open_reclaim(ctx, state);
1282         put_nfs_open_context(ctx);
1283         return ret;
1284 }
1285
1286 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1287 {
1288         struct nfs4_opendata *opendata;
1289         int ret;
1290
1291         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1292         if (IS_ERR(opendata))
1293                 return PTR_ERR(opendata);
1294         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1295         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1296                         sizeof(opendata->o_arg.u.delegation.data));
1297         ret = nfs4_open_recover(opendata, state);
1298         nfs4_opendata_put(opendata);
1299         return ret;
1300 }
1301
1302 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1303 {
1304         struct nfs4_exception exception = { };
1305         struct nfs_server *server = NFS_SERVER(state->inode);
1306         int err;
1307         do {
1308                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1309                 switch (err) {
1310                         case 0:
1311                         case -ENOENT:
1312                         case -ESTALE:
1313                                 goto out;
1314                         case -NFS4ERR_BADSESSION:
1315                         case -NFS4ERR_BADSLOT:
1316                         case -NFS4ERR_BAD_HIGH_SLOT:
1317                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1318                         case -NFS4ERR_DEADSESSION:
1319                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1320                                 goto out;
1321                         case -NFS4ERR_STALE_CLIENTID:
1322                         case -NFS4ERR_STALE_STATEID:
1323                         case -NFS4ERR_EXPIRED:
1324                                 /* Don't recall a delegation if it was lost */
1325                                 nfs4_schedule_lease_recovery(server->nfs_client);
1326                                 goto out;
1327                         case -ERESTARTSYS:
1328                                 /*
1329                                  * The show must go on: exit, but mark the
1330                                  * stateid as needing recovery.
1331                                  */
1332                         case -NFS4ERR_ADMIN_REVOKED:
1333                         case -NFS4ERR_BAD_STATEID:
1334                                 nfs4_schedule_stateid_recovery(server, state);
1335                         case -EKEYEXPIRED:
1336                                 /*
1337                                  * User RPCSEC_GSS context has expired.
1338                                  * We cannot recover this stateid now, so
1339                                  * skip it and allow recovery thread to
1340                                  * proceed.
1341                                  */
1342                         case -ENOMEM:
1343                                 err = 0;
1344                                 goto out;
1345                 }
1346                 err = nfs4_handle_exception(server, err, &exception);
1347         } while (exception.retry);
1348 out:
1349         return err;
1350 }
1351
1352 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1353 {
1354         struct nfs4_opendata *data = calldata;
1355
1356         data->rpc_status = task->tk_status;
1357         if (data->rpc_status == 0) {
1358                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1359                                 sizeof(data->o_res.stateid.data));
1360                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1361                 renew_lease(data->o_res.server, data->timestamp);
1362                 data->rpc_done = 1;
1363         }
1364 }
1365
1366 static void nfs4_open_confirm_release(void *calldata)
1367 {
1368         struct nfs4_opendata *data = calldata;
1369         struct nfs4_state *state = NULL;
1370
1371         /* If this request hasn't been cancelled, do nothing */
1372         if (data->cancelled == 0)
1373                 goto out_free;
1374         /* In case of error, no cleanup! */
1375         if (!data->rpc_done)
1376                 goto out_free;
1377         state = nfs4_opendata_to_nfs4_state(data);
1378         if (!IS_ERR(state))
1379                 nfs4_close_state(state, data->o_arg.fmode);
1380 out_free:
1381         nfs4_opendata_put(data);
1382 }
1383
1384 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1385         .rpc_call_done = nfs4_open_confirm_done,
1386         .rpc_release = nfs4_open_confirm_release,
1387 };
1388
1389 /*
1390  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1391  */
1392 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1393 {
1394         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1395         struct rpc_task *task;
1396         struct  rpc_message msg = {
1397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1398                 .rpc_argp = &data->c_arg,
1399                 .rpc_resp = &data->c_res,
1400                 .rpc_cred = data->owner->so_cred,
1401         };
1402         struct rpc_task_setup task_setup_data = {
1403                 .rpc_client = server->client,
1404                 .rpc_message = &msg,
1405                 .callback_ops = &nfs4_open_confirm_ops,
1406                 .callback_data = data,
1407                 .workqueue = nfsiod_workqueue,
1408                 .flags = RPC_TASK_ASYNC,
1409         };
1410         int status;
1411
1412         kref_get(&data->kref);
1413         data->rpc_done = 0;
1414         data->rpc_status = 0;
1415         data->timestamp = jiffies;
1416         task = rpc_run_task(&task_setup_data);
1417         if (IS_ERR(task))
1418                 return PTR_ERR(task);
1419         status = nfs4_wait_for_completion_rpc_task(task);
1420         if (status != 0) {
1421                 data->cancelled = 1;
1422                 smp_wmb();
1423         } else
1424                 status = data->rpc_status;
1425         rpc_put_task(task);
1426         return status;
1427 }
1428
1429 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1430 {
1431         struct nfs4_opendata *data = calldata;
1432         struct nfs4_state_owner *sp = data->owner;
1433
1434         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1435                 return;
1436         /*
1437          * Check if we still need to send an OPEN call, or if we can use
1438          * a delegation instead.
1439          */
1440         if (data->state != NULL) {
1441                 struct nfs_delegation *delegation;
1442
1443                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1444                         goto out_no_action;
1445                 rcu_read_lock();
1446                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1447                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1448                     can_open_delegated(delegation, data->o_arg.fmode))
1449                         goto unlock_no_action;
1450                 rcu_read_unlock();
1451         }
1452         /* Update sequence id. */
1453         data->o_arg.id = sp->so_seqid.owner_id;
1454         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1455         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1456                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1457                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1458         }
1459         data->timestamp = jiffies;
1460         if (nfs4_setup_sequence(data->o_arg.server,
1461                                 &data->o_arg.seq_args,
1462                                 &data->o_res.seq_res, task))
1463                 return;
1464         rpc_call_start(task);
1465         return;
1466 unlock_no_action:
1467         rcu_read_unlock();
1468 out_no_action:
1469         task->tk_action = NULL;
1470
1471 }
1472
1473 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1474 {
1475         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1476         nfs4_open_prepare(task, calldata);
1477 }
1478
1479 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1480 {
1481         struct nfs4_opendata *data = calldata;
1482
1483         data->rpc_status = task->tk_status;
1484
1485         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1486                 return;
1487
1488         if (task->tk_status == 0) {
1489                 switch (data->o_res.f_attr->mode & S_IFMT) {
1490                         case S_IFREG:
1491                                 break;
1492                         case S_IFLNK:
1493                                 data->rpc_status = -ELOOP;
1494                                 break;
1495                         case S_IFDIR:
1496                                 data->rpc_status = -EISDIR;
1497                                 break;
1498                         default:
1499                                 data->rpc_status = -ENOTDIR;
1500                 }
1501                 renew_lease(data->o_res.server, data->timestamp);
1502                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1503                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1504         }
1505         data->rpc_done = 1;
1506 }
1507
1508 static void nfs4_open_release(void *calldata)
1509 {
1510         struct nfs4_opendata *data = calldata;
1511         struct nfs4_state *state = NULL;
1512
1513         /* If this request hasn't been cancelled, do nothing */
1514         if (data->cancelled == 0)
1515                 goto out_free;
1516         /* In case of error, no cleanup! */
1517         if (data->rpc_status != 0 || !data->rpc_done)
1518                 goto out_free;
1519         /* In case we need an open_confirm, no cleanup! */
1520         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1521                 goto out_free;
1522         state = nfs4_opendata_to_nfs4_state(data);
1523         if (!IS_ERR(state))
1524                 nfs4_close_state(state, data->o_arg.fmode);
1525 out_free:
1526         nfs4_opendata_put(data);
1527 }
1528
1529 static const struct rpc_call_ops nfs4_open_ops = {
1530         .rpc_call_prepare = nfs4_open_prepare,
1531         .rpc_call_done = nfs4_open_done,
1532         .rpc_release = nfs4_open_release,
1533 };
1534
1535 static const struct rpc_call_ops nfs4_recover_open_ops = {
1536         .rpc_call_prepare = nfs4_recover_open_prepare,
1537         .rpc_call_done = nfs4_open_done,
1538         .rpc_release = nfs4_open_release,
1539 };
1540
1541 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1542 {
1543         struct inode *dir = data->dir->d_inode;
1544         struct nfs_server *server = NFS_SERVER(dir);
1545         struct nfs_openargs *o_arg = &data->o_arg;
1546         struct nfs_openres *o_res = &data->o_res;
1547         struct rpc_task *task;
1548         struct rpc_message msg = {
1549                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1550                 .rpc_argp = o_arg,
1551                 .rpc_resp = o_res,
1552                 .rpc_cred = data->owner->so_cred,
1553         };
1554         struct rpc_task_setup task_setup_data = {
1555                 .rpc_client = server->client,
1556                 .rpc_message = &msg,
1557                 .callback_ops = &nfs4_open_ops,
1558                 .callback_data = data,
1559                 .workqueue = nfsiod_workqueue,
1560                 .flags = RPC_TASK_ASYNC,
1561         };
1562         int status;
1563
1564         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1565         kref_get(&data->kref);
1566         data->rpc_done = 0;
1567         data->rpc_status = 0;
1568         data->cancelled = 0;
1569         if (isrecover)
1570                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1571         task = rpc_run_task(&task_setup_data);
1572         if (IS_ERR(task))
1573                 return PTR_ERR(task);
1574         status = nfs4_wait_for_completion_rpc_task(task);
1575         if (status != 0) {
1576                 data->cancelled = 1;
1577                 smp_wmb();
1578         } else
1579                 status = data->rpc_status;
1580         rpc_put_task(task);
1581
1582         return status;
1583 }
1584
1585 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1586 {
1587         struct inode *dir = data->dir->d_inode;
1588         struct nfs_openres *o_res = &data->o_res;
1589         int status;
1590
1591         status = nfs4_run_open_task(data, 1);
1592         if (status != 0 || !data->rpc_done)
1593                 return status;
1594
1595         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1596
1597         nfs_refresh_inode(dir, o_res->dir_attr);
1598
1599         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1600                 status = _nfs4_proc_open_confirm(data);
1601                 if (status != 0)
1602                         return status;
1603         }
1604
1605         return status;
1606 }
1607
1608 /*
1609  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1610  */
1611 static int _nfs4_proc_open(struct nfs4_opendata *data)
1612 {
1613         struct inode *dir = data->dir->d_inode;
1614         struct nfs_server *server = NFS_SERVER(dir);
1615         struct nfs_openargs *o_arg = &data->o_arg;
1616         struct nfs_openres *o_res = &data->o_res;
1617         int status;
1618
1619         status = nfs4_run_open_task(data, 0);
1620         if (!data->rpc_done)
1621                 return status;
1622         if (status != 0) {
1623                 if (status == -NFS4ERR_BADNAME &&
1624                                 !(o_arg->open_flags & O_CREAT))
1625                         return -ENOENT;
1626                 return status;
1627         }
1628
1629         nfs_fattr_map_and_free_names(server, &data->f_attr);
1630
1631         if (o_arg->open_flags & O_CREAT) {
1632                 update_changeattr(dir, &o_res->cinfo);
1633                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1634         } else
1635                 nfs_refresh_inode(dir, o_res->dir_attr);
1636         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1637                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1638         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1639                 status = _nfs4_proc_open_confirm(data);
1640                 if (status != 0)
1641                         return status;
1642         }
1643         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1644                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1645         return 0;
1646 }
1647
1648 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1649 {
1650         unsigned int loop;
1651         int ret;
1652
1653         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1654                 ret = nfs4_wait_clnt_recover(clp);
1655                 if (ret != 0)
1656                         break;
1657                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1658                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1659                         break;
1660                 nfs4_schedule_state_manager(clp);
1661                 ret = -EIO;
1662         }
1663         return ret;
1664 }
1665
1666 static int nfs4_recover_expired_lease(struct nfs_server *server)
1667 {
1668         return nfs4_client_recover_expired_lease(server->nfs_client);
1669 }
1670
1671 /*
1672  * OPEN_EXPIRED:
1673  *      reclaim state on the server after a network partition.
1674  *      Assumes caller holds the appropriate lock
1675  */
1676 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1677 {
1678         struct nfs4_opendata *opendata;
1679         int ret;
1680
1681         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1682         if (IS_ERR(opendata))
1683                 return PTR_ERR(opendata);
1684         ret = nfs4_open_recover(opendata, state);
1685         if (ret == -ESTALE)
1686                 d_drop(ctx->dentry);
1687         nfs4_opendata_put(opendata);
1688         return ret;
1689 }
1690
1691 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1692 {
1693         struct nfs_server *server = NFS_SERVER(state->inode);
1694         struct nfs4_exception exception = { };
1695         int err;
1696
1697         do {
1698                 err = _nfs4_open_expired(ctx, state);
1699                 switch (err) {
1700                 default:
1701                         goto out;
1702                 case -NFS4ERR_GRACE:
1703                 case -NFS4ERR_DELAY:
1704                         nfs4_handle_exception(server, err, &exception);
1705                         err = 0;
1706                 }
1707         } while (exception.retry);
1708 out:
1709         return err;
1710 }
1711
1712 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1713 {
1714         struct nfs_open_context *ctx;
1715         int ret;
1716
1717         ctx = nfs4_state_find_open_context(state);
1718         if (IS_ERR(ctx))
1719                 return PTR_ERR(ctx);
1720         ret = nfs4_do_open_expired(ctx, state);
1721         put_nfs_open_context(ctx);
1722         return ret;
1723 }
1724
1725 #if defined(CONFIG_NFS_V4_1)
1726 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1727 {
1728         int status;
1729         struct nfs_server *server = NFS_SERVER(state->inode);
1730
1731         status = nfs41_test_stateid(server, &state->stateid);
1732         if (status == NFS_OK)
1733                 return 0;
1734         nfs41_free_stateid(server, &state->stateid);
1735         return nfs4_open_expired(sp, state);
1736 }
1737 #endif
1738
1739 /*
1740  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1741  * fields corresponding to attributes that were used to store the verifier.
1742  * Make sure we clobber those fields in the later setattr call
1743  */
1744 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1745 {
1746         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1747             !(sattr->ia_valid & ATTR_ATIME_SET))
1748                 sattr->ia_valid |= ATTR_ATIME;
1749
1750         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1751             !(sattr->ia_valid & ATTR_MTIME_SET))
1752                 sattr->ia_valid |= ATTR_MTIME;
1753 }
1754
1755 /*
1756  * Returns a referenced nfs4_state
1757  */
1758 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)
1759 {
1760         struct nfs4_state_owner  *sp;
1761         struct nfs4_state     *state = NULL;
1762         struct nfs_server       *server = NFS_SERVER(dir);
1763         struct nfs4_opendata *opendata;
1764         int status;
1765
1766         /* Protect against reboot recovery conflicts */
1767         status = -ENOMEM;
1768         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1769         if (sp == NULL) {
1770                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1771                 goto out_err;
1772         }
1773         status = nfs4_recover_expired_lease(server);
1774         if (status != 0)
1775                 goto err_put_state_owner;
1776         if (dentry->d_inode != NULL)
1777                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1778         status = -ENOMEM;
1779         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1780         if (opendata == NULL)
1781                 goto err_put_state_owner;
1782
1783         if (dentry->d_inode != NULL)
1784                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1785
1786         status = _nfs4_proc_open(opendata);
1787         if (status != 0)
1788                 goto err_opendata_put;
1789
1790         state = nfs4_opendata_to_nfs4_state(opendata);
1791         status = PTR_ERR(state);
1792         if (IS_ERR(state))
1793                 goto err_opendata_put;
1794         if (server->caps & NFS_CAP_POSIX_LOCK)
1795                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1796
1797         if (opendata->o_arg.open_flags & O_EXCL) {
1798                 nfs4_exclusive_attrset(opendata, sattr);
1799
1800                 nfs_fattr_init(opendata->o_res.f_attr);
1801                 status = nfs4_do_setattr(state->inode, cred,
1802                                 opendata->o_res.f_attr, sattr,
1803                                 state);
1804                 if (status == 0)
1805                         nfs_setattr_update_inode(state->inode, sattr);
1806                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1807         }
1808         nfs4_opendata_put(opendata);
1809         nfs4_put_state_owner(sp);
1810         *res = state;
1811         return 0;
1812 err_opendata_put:
1813         nfs4_opendata_put(opendata);
1814 err_put_state_owner:
1815         nfs4_put_state_owner(sp);
1816 out_err:
1817         *res = NULL;
1818         return status;
1819 }
1820
1821
1822 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)
1823 {
1824         struct nfs4_exception exception = { };
1825         struct nfs4_state *res;
1826         int status;
1827
1828         do {
1829                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1830                 if (status == 0)
1831                         break;
1832                 /* NOTE: BAD_SEQID means the server and client disagree about the
1833                  * book-keeping w.r.t. state-changing operations
1834                  * (OPEN/CLOSE/LOCK/LOCKU...)
1835                  * It is actually a sign of a bug on the client or on the server.
1836                  *
1837                  * If we receive a BAD_SEQID error in the particular case of
1838                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1839                  * have unhashed the old state_owner for us, and that we can
1840                  * therefore safely retry using a new one. We should still warn
1841                  * the user though...
1842                  */
1843                 if (status == -NFS4ERR_BAD_SEQID) {
1844                         printk(KERN_WARNING "NFS: v4 server %s "
1845                                         " returned a bad sequence-id error!\n",
1846                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1847                         exception.retry = 1;
1848                         continue;
1849                 }
1850                 /*
1851                  * BAD_STATEID on OPEN means that the server cancelled our
1852                  * state before it received the OPEN_CONFIRM.
1853                  * Recover by retrying the request as per the discussion
1854                  * on Page 181 of RFC3530.
1855                  */
1856                 if (status == -NFS4ERR_BAD_STATEID) {
1857                         exception.retry = 1;
1858                         continue;
1859                 }
1860                 if (status == -EAGAIN) {
1861                         /* We must have found a delegation */
1862                         exception.retry = 1;
1863                         continue;
1864                 }
1865                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1866                                         status, &exception));
1867         } while (exception.retry);
1868         return res;
1869 }
1870
1871 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1872                             struct nfs_fattr *fattr, struct iattr *sattr,
1873                             struct nfs4_state *state)
1874 {
1875         struct nfs_server *server = NFS_SERVER(inode);
1876         struct nfs_setattrargs  arg = {
1877                 .fh             = NFS_FH(inode),
1878                 .iap            = sattr,
1879                 .server         = server,
1880                 .bitmask = server->attr_bitmask,
1881         };
1882         struct nfs_setattrres  res = {
1883                 .fattr          = fattr,
1884                 .server         = server,
1885         };
1886         struct rpc_message msg = {
1887                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1888                 .rpc_argp       = &arg,
1889                 .rpc_resp       = &res,
1890                 .rpc_cred       = cred,
1891         };
1892         unsigned long timestamp = jiffies;
1893         int status;
1894
1895         nfs_fattr_init(fattr);
1896
1897         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1898                 /* Use that stateid */
1899         } else if (state != NULL) {
1900                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1901         } else
1902                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1903
1904         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1905         if (status == 0 && state != NULL)
1906                 renew_lease(server, timestamp);
1907         return status;
1908 }
1909
1910 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1911                            struct nfs_fattr *fattr, struct iattr *sattr,
1912                            struct nfs4_state *state)
1913 {
1914         struct nfs_server *server = NFS_SERVER(inode);
1915         struct nfs4_exception exception = { };
1916         int err;
1917         do {
1918                 err = nfs4_handle_exception(server,
1919                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1920                                 &exception);
1921         } while (exception.retry);
1922         return err;
1923 }
1924
1925 struct nfs4_closedata {
1926         struct inode *inode;
1927         struct nfs4_state *state;
1928         struct nfs_closeargs arg;
1929         struct nfs_closeres res;
1930         struct nfs_fattr fattr;
1931         unsigned long timestamp;
1932         bool roc;
1933         u32 roc_barrier;
1934 };
1935
1936 static void nfs4_free_closedata(void *data)
1937 {
1938         struct nfs4_closedata *calldata = data;
1939         struct nfs4_state_owner *sp = calldata->state->owner;
1940         struct super_block *sb = calldata->state->inode->i_sb;
1941
1942         if (calldata->roc)
1943                 pnfs_roc_release(calldata->state->inode);
1944         nfs4_put_open_state(calldata->state);
1945         nfs_free_seqid(calldata->arg.seqid);
1946         nfs4_put_state_owner(sp);
1947         nfs_sb_deactive(sb);
1948         kfree(calldata);
1949 }
1950
1951 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1952                 fmode_t fmode)
1953 {
1954         spin_lock(&state->owner->so_lock);
1955         if (!(fmode & FMODE_READ))
1956                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1957         if (!(fmode & FMODE_WRITE))
1958                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1959         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1960         spin_unlock(&state->owner->so_lock);
1961 }
1962
1963 static void nfs4_close_done(struct rpc_task *task, void *data)
1964 {
1965         struct nfs4_closedata *calldata = data;
1966         struct nfs4_state *state = calldata->state;
1967         struct nfs_server *server = NFS_SERVER(calldata->inode);
1968
1969         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1970                 return;
1971         /* hmm. we are done with the inode, and in the process of freeing
1972          * the state_owner. we keep this around to process errors
1973          */
1974         switch (task->tk_status) {
1975                 case 0:
1976                         if (calldata->roc)
1977                                 pnfs_roc_set_barrier(state->inode,
1978                                                      calldata->roc_barrier);
1979                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1980                         renew_lease(server, calldata->timestamp);
1981                         nfs4_close_clear_stateid_flags(state,
1982                                         calldata->arg.fmode);
1983                         break;
1984                 case -NFS4ERR_STALE_STATEID:
1985                 case -NFS4ERR_OLD_STATEID:
1986                 case -NFS4ERR_BAD_STATEID:
1987                 case -NFS4ERR_EXPIRED:
1988                         if (calldata->arg.fmode == 0)
1989                                 break;
1990                 default:
1991                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1992                                 rpc_restart_call_prepare(task);
1993         }
1994         nfs_release_seqid(calldata->arg.seqid);
1995         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1996 }
1997
1998 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1999 {
2000         struct nfs4_closedata *calldata = data;
2001         struct nfs4_state *state = calldata->state;
2002         int call_close = 0;
2003
2004         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2005                 return;
2006
2007         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2008         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2009         spin_lock(&state->owner->so_lock);
2010         /* Calculate the change in open mode */
2011         if (state->n_rdwr == 0) {
2012                 if (state->n_rdonly == 0) {
2013                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2014                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2015                         calldata->arg.fmode &= ~FMODE_READ;
2016                 }
2017                 if (state->n_wronly == 0) {
2018                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2019                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2020                         calldata->arg.fmode &= ~FMODE_WRITE;
2021                 }
2022         }
2023         spin_unlock(&state->owner->so_lock);
2024
2025         if (!call_close) {
2026                 /* Note: exit _without_ calling nfs4_close_done */
2027                 task->tk_action = NULL;
2028                 return;
2029         }
2030
2031         if (calldata->arg.fmode == 0) {
2032                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2033                 if (calldata->roc &&
2034                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2035                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2036                                      task, NULL);
2037                         return;
2038                 }
2039         }
2040
2041         nfs_fattr_init(calldata->res.fattr);
2042         calldata->timestamp = jiffies;
2043         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2044                                 &calldata->arg.seq_args,
2045                                 &calldata->res.seq_res,
2046                                 task))
2047                 return;
2048         rpc_call_start(task);
2049 }
2050
2051 static const struct rpc_call_ops nfs4_close_ops = {
2052         .rpc_call_prepare = nfs4_close_prepare,
2053         .rpc_call_done = nfs4_close_done,
2054         .rpc_release = nfs4_free_closedata,
2055 };
2056
2057 /*
2058  * It is possible for data to be read/written from a mem-mapped file
2059  * after the sys_close call (which hits the vfs layer as a flush).
2060  * This means that we can't safely call nfsv4 close on a file until
2061  * the inode is cleared. This in turn means that we are not good
2062  * NFSv4 citizens - we do not indicate to the server to update the file's
2063  * share state even when we are done with one of the three share
2064  * stateid's in the inode.
2065  *
2066  * NOTE: Caller must be holding the sp->so_owner semaphore!
2067  */
2068 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2069 {
2070         struct nfs_server *server = NFS_SERVER(state->inode);
2071         struct nfs4_closedata *calldata;
2072         struct nfs4_state_owner *sp = state->owner;
2073         struct rpc_task *task;
2074         struct rpc_message msg = {
2075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2076                 .rpc_cred = state->owner->so_cred,
2077         };
2078         struct rpc_task_setup task_setup_data = {
2079                 .rpc_client = server->client,
2080                 .rpc_message = &msg,
2081                 .callback_ops = &nfs4_close_ops,
2082                 .workqueue = nfsiod_workqueue,
2083                 .flags = RPC_TASK_ASYNC,
2084         };
2085         int status = -ENOMEM;
2086
2087         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2088         if (calldata == NULL)
2089                 goto out;
2090         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2091         calldata->inode = state->inode;
2092         calldata->state = state;
2093         calldata->arg.fh = NFS_FH(state->inode);
2094         calldata->arg.stateid = &state->open_stateid;
2095         /* Serialization for the sequence id */
2096         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2097         if (calldata->arg.seqid == NULL)
2098                 goto out_free_calldata;
2099         calldata->arg.fmode = 0;
2100         calldata->arg.bitmask = server->cache_consistency_bitmask;
2101         calldata->res.fattr = &calldata->fattr;
2102         calldata->res.seqid = calldata->arg.seqid;
2103         calldata->res.server = server;
2104         calldata->roc = roc;
2105         nfs_sb_active(calldata->inode->i_sb);
2106
2107         msg.rpc_argp = &calldata->arg;
2108         msg.rpc_resp = &calldata->res;
2109         task_setup_data.callback_data = calldata;
2110         task = rpc_run_task(&task_setup_data);
2111         if (IS_ERR(task))
2112                 return PTR_ERR(task);
2113         status = 0;
2114         if (wait)
2115                 status = rpc_wait_for_completion_task(task);
2116         rpc_put_task(task);
2117         return status;
2118 out_free_calldata:
2119         kfree(calldata);
2120 out:
2121         if (roc)
2122                 pnfs_roc_release(state->inode);
2123         nfs4_put_open_state(state);
2124         nfs4_put_state_owner(sp);
2125         return status;
2126 }
2127
2128 static struct inode *
2129 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2130 {
2131         struct nfs4_state *state;
2132
2133         /* Protect against concurrent sillydeletes */
2134         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2135         if (IS_ERR(state))
2136                 return ERR_CAST(state);
2137         ctx->state = state;
2138         return igrab(state->inode);
2139 }
2140
2141 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2142 {
2143         if (ctx->state == NULL)
2144                 return;
2145         if (is_sync)
2146                 nfs4_close_sync(ctx->state, ctx->mode);
2147         else
2148                 nfs4_close_state(ctx->state, ctx->mode);
2149 }
2150
2151 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2152 {
2153         struct nfs4_server_caps_arg args = {
2154                 .fhandle = fhandle,
2155         };
2156         struct nfs4_server_caps_res res = {};
2157         struct rpc_message msg = {
2158                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2159                 .rpc_argp = &args,
2160                 .rpc_resp = &res,
2161         };
2162         int status;
2163
2164         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2165         if (status == 0) {
2166                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2167                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2168                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2169                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2170                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2171                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2172                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2173                         server->caps |= NFS_CAP_ACLS;
2174                 if (res.has_links != 0)
2175                         server->caps |= NFS_CAP_HARDLINKS;
2176                 if (res.has_symlinks != 0)
2177                         server->caps |= NFS_CAP_SYMLINKS;
2178                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2179                         server->caps |= NFS_CAP_FILEID;
2180                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2181                         server->caps |= NFS_CAP_MODE;
2182                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2183                         server->caps |= NFS_CAP_NLINK;
2184                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2185                         server->caps |= NFS_CAP_OWNER;
2186                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2187                         server->caps |= NFS_CAP_OWNER_GROUP;
2188                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2189                         server->caps |= NFS_CAP_ATIME;
2190                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2191                         server->caps |= NFS_CAP_CTIME;
2192                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2193                         server->caps |= NFS_CAP_MTIME;
2194
2195                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2196                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2197                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2198                 server->acl_bitmask = res.acl_bitmask;
2199         }
2200
2201         return status;
2202 }
2203
2204 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2205 {
2206         struct nfs4_exception exception = { };
2207         int err;
2208         do {
2209                 err = nfs4_handle_exception(server,
2210                                 _nfs4_server_capabilities(server, fhandle),
2211                                 &exception);
2212         } while (exception.retry);
2213         return err;
2214 }
2215
2216 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2217                 struct nfs_fsinfo *info)
2218 {
2219         struct nfs4_lookup_root_arg args = {
2220                 .bitmask = nfs4_fattr_bitmap,
2221         };
2222         struct nfs4_lookup_res res = {
2223                 .server = server,
2224                 .fattr = info->fattr,
2225                 .fh = fhandle,
2226         };
2227         struct rpc_message msg = {
2228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2229                 .rpc_argp = &args,
2230                 .rpc_resp = &res,
2231         };
2232
2233         nfs_fattr_init(info->fattr);
2234         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2235 }
2236
2237 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2238                 struct nfs_fsinfo *info)
2239 {
2240         struct nfs4_exception exception = { };
2241         int err;
2242         do {
2243                 err = _nfs4_lookup_root(server, fhandle, info);
2244                 switch (err) {
2245                 case 0:
2246                 case -NFS4ERR_WRONGSEC:
2247                         break;
2248                 default:
2249                         err = nfs4_handle_exception(server, err, &exception);
2250                 }
2251         } while (exception.retry);
2252         return err;
2253 }
2254
2255 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2256                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2257 {
2258         struct rpc_auth *auth;
2259         int ret;
2260
2261         auth = rpcauth_create(flavor, server->client);
2262         if (!auth) {
2263                 ret = -EIO;
2264                 goto out;
2265         }
2266         ret = nfs4_lookup_root(server, fhandle, info);
2267 out:
2268         return ret;
2269 }
2270
2271 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2272                               struct nfs_fsinfo *info)
2273 {
2274         int i, len, status = 0;
2275         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2276
2277         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2278         flav_array[len] = RPC_AUTH_NULL;
2279         len += 1;
2280
2281         for (i = 0; i < len; i++) {
2282                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2283                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2284                         continue;
2285                 break;
2286         }
2287         /*
2288          * -EACCESS could mean that the user doesn't have correct permissions
2289          * to access the mount.  It could also mean that we tried to mount
2290          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2291          * existing mount programs don't handle -EACCES very well so it should
2292          * be mapped to -EPERM instead.
2293          */
2294         if (status == -EACCES)
2295                 status = -EPERM;
2296         return status;
2297 }
2298
2299 /*
2300  * get the file handle for the "/" directory on the server
2301  */
2302 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2303                               struct nfs_fsinfo *info)
2304 {
2305         int minor_version = server->nfs_client->cl_minorversion;
2306         int status = nfs4_lookup_root(server, fhandle, info);
2307         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2308                 /*
2309                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2310                  * by nfs4_map_errors() as this function exits.
2311                  */
2312                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2313         if (status == 0)
2314                 status = nfs4_server_capabilities(server, fhandle);
2315         if (status == 0)
2316                 status = nfs4_do_fsinfo(server, fhandle, info);
2317         return nfs4_map_errors(status);
2318 }
2319
2320 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2321 /*
2322  * Get locations and (maybe) other attributes of a referral.
2323  * Note that we'll actually follow the referral later when
2324  * we detect fsid mismatch in inode revalidation
2325  */
2326 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2327                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2328 {
2329         int status = -ENOMEM;
2330         struct page *page = NULL;
2331         struct nfs4_fs_locations *locations = NULL;
2332
2333         page = alloc_page(GFP_KERNEL);
2334         if (page == NULL)
2335                 goto out;
2336         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2337         if (locations == NULL)
2338                 goto out;
2339
2340         status = nfs4_proc_fs_locations(dir, name, locations, page);
2341         if (status != 0)
2342                 goto out;
2343         /* Make sure server returned a different fsid for the referral */
2344         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2345                 dprintk("%s: server did not return a different fsid for"
2346                         " a referral at %s\n", __func__, name->name);
2347                 status = -EIO;
2348                 goto out;
2349         }
2350         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2351         nfs_fixup_referral_attributes(&locations->fattr);
2352
2353         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2354         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2355         memset(fhandle, 0, sizeof(struct nfs_fh));
2356 out:
2357         if (page)
2358                 __free_page(page);
2359         kfree(locations);
2360         return status;
2361 }
2362
2363 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2364 {
2365         struct nfs4_getattr_arg args = {
2366                 .fh = fhandle,
2367                 .bitmask = server->attr_bitmask,
2368         };
2369         struct nfs4_getattr_res res = {
2370                 .fattr = fattr,
2371                 .server = server,
2372         };
2373         struct rpc_message msg = {
2374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2375                 .rpc_argp = &args,
2376                 .rpc_resp = &res,
2377         };
2378
2379         nfs_fattr_init(fattr);
2380         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2381 }
2382
2383 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2384 {
2385         struct nfs4_exception exception = { };
2386         int err;
2387         do {
2388                 err = nfs4_handle_exception(server,
2389                                 _nfs4_proc_getattr(server, fhandle, fattr),
2390                                 &exception);
2391         } while (exception.retry);
2392         return err;
2393 }
2394
2395 /*
2396  * The file is not closed if it is opened due to the a request to change
2397  * the size of the file. The open call will not be needed once the
2398  * VFS layer lookup-intents are implemented.
2399  *
2400  * Close is called when the inode is destroyed.
2401  * If we haven't opened the file for O_WRONLY, we
2402  * need to in the size_change case to obtain a stateid.
2403  *
2404  * Got race?
2405  * Because OPEN is always done by name in nfsv4, it is
2406  * possible that we opened a different file by the same
2407  * name.  We can recognize this race condition, but we
2408  * can't do anything about it besides returning an error.
2409  *
2410  * This will be fixed with VFS changes (lookup-intent).
2411  */
2412 static int
2413 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2414                   struct iattr *sattr)
2415 {
2416         struct inode *inode = dentry->d_inode;
2417         struct rpc_cred *cred = NULL;
2418         struct nfs4_state *state = NULL;
2419         int status;
2420
2421         if (pnfs_ld_layoutret_on_setattr(inode))
2422                 pnfs_return_layout(inode);
2423
2424         nfs_fattr_init(fattr);
2425
2426         /* Search for an existing open(O_WRITE) file */
2427         if (sattr->ia_valid & ATTR_FILE) {
2428                 struct nfs_open_context *ctx;
2429
2430                 ctx = nfs_file_open_context(sattr->ia_file);
2431                 if (ctx) {
2432                         cred = ctx->cred;
2433                         state = ctx->state;
2434                 }
2435         }
2436
2437         /* Deal with open(O_TRUNC) */
2438         if (sattr->ia_valid & ATTR_OPEN)
2439                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2440
2441         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2442         if (status == 0)
2443                 nfs_setattr_update_inode(inode, sattr);
2444         return status;
2445 }
2446
2447 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2448                 const struct qstr *name, struct nfs_fh *fhandle,
2449                 struct nfs_fattr *fattr)
2450 {
2451         struct nfs_server *server = NFS_SERVER(dir);
2452         int                    status;
2453         struct nfs4_lookup_arg args = {
2454                 .bitmask = server->attr_bitmask,
2455                 .dir_fh = NFS_FH(dir),
2456                 .name = name,
2457         };
2458         struct nfs4_lookup_res res = {
2459                 .server = server,
2460                 .fattr = fattr,
2461                 .fh = fhandle,
2462         };
2463         struct rpc_message msg = {
2464                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2465                 .rpc_argp = &args,
2466                 .rpc_resp = &res,
2467         };
2468
2469         nfs_fattr_init(fattr);
2470
2471         dprintk("NFS call  lookup %s\n", name->name);
2472         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2473         dprintk("NFS reply lookup: %d\n", status);
2474         return status;
2475 }
2476
2477 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2478 {
2479         memset(fh, 0, sizeof(struct nfs_fh));
2480         fattr->fsid.major = 1;
2481         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2482                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2483         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2484         fattr->nlink = 2;
2485 }
2486
2487 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2488                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2489 {
2490         struct nfs4_exception exception = { };
2491         int err;
2492         do {
2493                 int status;
2494
2495                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2496                 switch (status) {
2497                 case -NFS4ERR_BADNAME:
2498                         return -ENOENT;
2499                 case -NFS4ERR_MOVED:
2500                         return nfs4_get_referral(dir, name, fattr, fhandle);
2501                 case -NFS4ERR_WRONGSEC:
2502                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2503                 }
2504                 err = nfs4_handle_exception(NFS_SERVER(dir),
2505                                 status, &exception);
2506         } while (exception.retry);
2507         return err;
2508 }
2509
2510 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2511 {
2512         struct nfs_server *server = NFS_SERVER(inode);
2513         struct nfs4_accessargs args = {
2514                 .fh = NFS_FH(inode),
2515                 .bitmask = server->cache_consistency_bitmask,
2516         };
2517         struct nfs4_accessres res = {
2518                 .server = server,
2519         };
2520         struct rpc_message msg = {
2521                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2522                 .rpc_argp = &args,
2523                 .rpc_resp = &res,
2524                 .rpc_cred = entry->cred,
2525         };
2526         int mode = entry->mask;
2527         int status;
2528
2529         /*
2530          * Determine which access bits we want to ask for...
2531          */
2532         if (mode & MAY_READ)
2533                 args.access |= NFS4_ACCESS_READ;
2534         if (S_ISDIR(inode->i_mode)) {
2535                 if (mode & MAY_WRITE)
2536                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2537                 if (mode & MAY_EXEC)
2538                         args.access |= NFS4_ACCESS_LOOKUP;
2539         } else {
2540                 if (mode & MAY_WRITE)
2541                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2542                 if (mode & MAY_EXEC)
2543                         args.access |= NFS4_ACCESS_EXECUTE;
2544         }
2545
2546         res.fattr = nfs_alloc_fattr();
2547         if (res.fattr == NULL)
2548                 return -ENOMEM;
2549
2550         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2551         if (!status) {
2552                 entry->mask = 0;
2553                 if (res.access & NFS4_ACCESS_READ)
2554                         entry->mask |= MAY_READ;
2555                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2556                         entry->mask |= MAY_WRITE;
2557                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2558                         entry->mask |= MAY_EXEC;
2559                 nfs_refresh_inode(inode, res.fattr);
2560         }
2561         nfs_free_fattr(res.fattr);
2562         return status;
2563 }
2564
2565 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2566 {
2567         struct nfs4_exception exception = { };
2568         int err;
2569         do {
2570                 err = nfs4_handle_exception(NFS_SERVER(inode),
2571                                 _nfs4_proc_access(inode, entry),
2572                                 &exception);
2573         } while (exception.retry);
2574         return err;
2575 }
2576
2577 /*
2578  * TODO: For the time being, we don't try to get any attributes
2579  * along with any of the zero-copy operations READ, READDIR,
2580  * READLINK, WRITE.
2581  *
2582  * In the case of the first three, we want to put the GETATTR
2583  * after the read-type operation -- this is because it is hard
2584  * to predict the length of a GETATTR response in v4, and thus
2585  * align the READ data correctly.  This means that the GETATTR
2586  * may end up partially falling into the page cache, and we should
2587  * shift it into the 'tail' of the xdr_buf before processing.
2588  * To do this efficiently, we need to know the total length
2589  * of data received, which doesn't seem to be available outside
2590  * of the RPC layer.
2591  *
2592  * In the case of WRITE, we also want to put the GETATTR after
2593  * the operation -- in this case because we want to make sure
2594  * we get the post-operation mtime and size.  This means that
2595  * we can't use xdr_encode_pages() as written: we need a variant
2596  * of it which would leave room in the 'tail' iovec.
2597  *
2598  * Both of these changes to the XDR layer would in fact be quite
2599  * minor, but I decided to leave them for a subsequent patch.
2600  */
2601 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2602                 unsigned int pgbase, unsigned int pglen)
2603 {
2604         struct nfs4_readlink args = {
2605                 .fh       = NFS_FH(inode),
2606                 .pgbase   = pgbase,
2607                 .pglen    = pglen,
2608                 .pages    = &page,
2609         };
2610         struct nfs4_readlink_res res;
2611         struct rpc_message msg = {
2612                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2613                 .rpc_argp = &args,
2614                 .rpc_resp = &res,
2615         };
2616
2617         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2618 }
2619
2620 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2621                 unsigned int pgbase, unsigned int pglen)
2622 {
2623         struct nfs4_exception exception = { };
2624         int err;
2625         do {
2626                 err = nfs4_handle_exception(NFS_SERVER(inode),
2627                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2628                                 &exception);
2629         } while (exception.retry);
2630         return err;
2631 }
2632
2633 /*
2634  * Got race?
2635  * We will need to arrange for the VFS layer to provide an atomic open.
2636  * Until then, this create/open method is prone to inefficiency and race
2637  * conditions due to the lookup, create, and open VFS calls from sys_open()
2638  * placed on the wire.
2639  *
2640  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2641  * The file will be opened again in the subsequent VFS open call
2642  * (nfs4_proc_file_open).
2643  *
2644  * The open for read will just hang around to be used by any process that
2645  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2646  */
2647
2648 static int
2649 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2650                  int flags, struct nfs_open_context *ctx)
2651 {
2652         struct dentry *de = dentry;
2653         struct nfs4_state *state;
2654         struct rpc_cred *cred = NULL;
2655         fmode_t fmode = 0;
2656         int status = 0;
2657
2658         if (ctx != NULL) {
2659                 cred = ctx->cred;
2660                 de = ctx->dentry;
2661                 fmode = ctx->mode;
2662         }
2663         sattr->ia_mode &= ~current_umask();
2664         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2665         d_drop(dentry);
2666         if (IS_ERR(state)) {
2667                 status = PTR_ERR(state);
2668                 goto out;
2669         }
2670         d_add(dentry, igrab(state->inode));
2671         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2672         if (ctx != NULL)
2673                 ctx->state = state;
2674         else
2675                 nfs4_close_sync(state, fmode);
2676 out:
2677         return status;
2678 }
2679
2680 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2681 {
2682         struct nfs_server *server = NFS_SERVER(dir);
2683         struct nfs_removeargs args = {
2684                 .fh = NFS_FH(dir),
2685                 .name.len = name->len,
2686                 .name.name = name->name,
2687                 .bitmask = server->attr_bitmask,
2688         };
2689         struct nfs_removeres res = {
2690                 .server = server,
2691         };
2692         struct rpc_message msg = {
2693                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2694                 .rpc_argp = &args,
2695                 .rpc_resp = &res,
2696         };
2697         int status = -ENOMEM;
2698
2699         res.dir_attr = nfs_alloc_fattr();
2700         if (res.dir_attr == NULL)
2701                 goto out;
2702
2703         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2704         if (status == 0) {
2705                 update_changeattr(dir, &res.cinfo);
2706                 nfs_post_op_update_inode(dir, res.dir_attr);
2707         }
2708         nfs_free_fattr(res.dir_attr);
2709 out:
2710         return status;
2711 }
2712
2713 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2714 {
2715         struct nfs4_exception exception = { };
2716         int err;
2717         do {
2718                 err = nfs4_handle_exception(NFS_SERVER(dir),
2719                                 _nfs4_proc_remove(dir, name),
2720                                 &exception);
2721         } while (exception.retry);
2722         return err;
2723 }
2724
2725 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2726 {
2727         struct nfs_server *server = NFS_SERVER(dir);
2728         struct nfs_removeargs *args = msg->rpc_argp;
2729         struct nfs_removeres *res = msg->rpc_resp;
2730
2731         args->bitmask = server->cache_consistency_bitmask;
2732         res->server = server;
2733         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2734         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2735 }
2736
2737 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2738 {
2739         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2740
2741         if (!nfs4_sequence_done(task, &res->seq_res))
2742                 return 0;
2743         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2744                 return 0;
2745         update_changeattr(dir, &res->cinfo);
2746         nfs_post_op_update_inode(dir, res->dir_attr);
2747         return 1;
2748 }
2749
2750 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2751 {
2752         struct nfs_server *server = NFS_SERVER(dir);
2753         struct nfs_renameargs *arg = msg->rpc_argp;
2754         struct nfs_renameres *res = msg->rpc_resp;
2755
2756         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2757         arg->bitmask = server->attr_bitmask;
2758         res->server = server;
2759         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2760 }
2761
2762 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2763                                  struct inode *new_dir)
2764 {
2765         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2766
2767         if (!nfs4_sequence_done(task, &res->seq_res))
2768                 return 0;
2769         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2770                 return 0;
2771
2772         update_changeattr(old_dir, &res->old_cinfo);
2773         nfs_post_op_update_inode(old_dir, res->old_fattr);
2774         update_changeattr(new_dir, &res->new_cinfo);
2775         nfs_post_op_update_inode(new_dir, res->new_fattr);
2776         return 1;
2777 }
2778
2779 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2780                 struct inode *new_dir, struct qstr *new_name)
2781 {
2782         struct nfs_server *server = NFS_SERVER(old_dir);
2783         struct nfs_renameargs arg = {
2784                 .old_dir = NFS_FH(old_dir),
2785                 .new_dir = NFS_FH(new_dir),
2786                 .old_name = old_name,
2787                 .new_name = new_name,
2788                 .bitmask = server->attr_bitmask,
2789         };
2790         struct nfs_renameres res = {
2791                 .server = server,
2792         };
2793         struct rpc_message msg = {
2794                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2795                 .rpc_argp = &arg,
2796                 .rpc_resp = &res,
2797         };
2798         int status = -ENOMEM;
2799
2800         res.old_fattr = nfs_alloc_fattr();
2801         res.new_fattr = nfs_alloc_fattr();
2802         if (res.old_fattr == NULL || res.new_fattr == NULL)
2803                 goto out;
2804
2805         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2806         if (!status) {
2807                 update_changeattr(old_dir, &res.old_cinfo);
2808                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2809                 update_changeattr(new_dir, &res.new_cinfo);
2810                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2811         }
2812 out:
2813         nfs_free_fattr(res.new_fattr);
2814         nfs_free_fattr(res.old_fattr);
2815         return status;
2816 }
2817
2818 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2819                 struct inode *new_dir, struct qstr *new_name)
2820 {
2821         struct nfs4_exception exception = { };
2822         int err;
2823         do {
2824                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2825                                 _nfs4_proc_rename(old_dir, old_name,
2826                                         new_dir, new_name),
2827                                 &exception);
2828         } while (exception.retry);
2829         return err;
2830 }
2831
2832 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2833 {
2834         struct nfs_server *server = NFS_SERVER(inode);
2835         struct nfs4_link_arg arg = {
2836                 .fh     = NFS_FH(inode),
2837                 .dir_fh = NFS_FH(dir),
2838                 .name   = name,
2839                 .bitmask = server->attr_bitmask,
2840         };
2841         struct nfs4_link_res res = {
2842                 .server = server,
2843         };
2844         struct rpc_message msg = {
2845                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2846                 .rpc_argp = &arg,
2847                 .rpc_resp = &res,
2848         };
2849         int status = -ENOMEM;
2850
2851         res.fattr = nfs_alloc_fattr();
2852         res.dir_attr = nfs_alloc_fattr();
2853         if (res.fattr == NULL || res.dir_attr == NULL)
2854                 goto out;
2855
2856         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2857         if (!status) {
2858                 update_changeattr(dir, &res.cinfo);
2859                 nfs_post_op_update_inode(dir, res.dir_attr);
2860                 nfs_post_op_update_inode(inode, res.fattr);
2861         }
2862 out:
2863         nfs_free_fattr(res.dir_attr);
2864         nfs_free_fattr(res.fattr);
2865         return status;
2866 }
2867
2868 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2869 {
2870         struct nfs4_exception exception = { };
2871         int err;
2872         do {
2873                 err = nfs4_handle_exception(NFS_SERVER(inode),
2874                                 _nfs4_proc_link(inode, dir, name),
2875                                 &exception);
2876         } while (exception.retry);
2877         return err;
2878 }
2879
2880 struct nfs4_createdata {
2881         struct rpc_message msg;
2882         struct nfs4_create_arg arg;
2883         struct nfs4_create_res res;
2884         struct nfs_fh fh;
2885         struct nfs_fattr fattr;
2886         struct nfs_fattr dir_fattr;
2887 };
2888
2889 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2890                 struct qstr *name, struct iattr *sattr, u32 ftype)
2891 {
2892         struct nfs4_createdata *data;
2893
2894         data = kzalloc(sizeof(*data), GFP_KERNEL);
2895         if (data != NULL) {
2896                 struct nfs_server *server = NFS_SERVER(dir);
2897
2898                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2899                 data->msg.rpc_argp = &data->arg;
2900                 data->msg.rpc_resp = &data->res;
2901                 data->arg.dir_fh = NFS_FH(dir);
2902                 data->arg.server = server;
2903                 data->arg.name = name;
2904                 data->arg.attrs = sattr;
2905                 data->arg.ftype = ftype;
2906                 data->arg.bitmask = server->attr_bitmask;
2907                 data->res.server = server;
2908                 data->res.fh = &data->fh;
2909                 data->res.fattr = &data->fattr;
2910                 data->res.dir_fattr = &data->dir_fattr;
2911                 nfs_fattr_init(data->res.fattr);
2912                 nfs_fattr_init(data->res.dir_fattr);
2913         }
2914         return data;
2915 }
2916
2917 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2918 {
2919         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2920                                     &data->arg.seq_args, &data->res.seq_res, 1);
2921         if (status == 0) {
2922                 update_changeattr(dir, &data->res.dir_cinfo);
2923                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2924                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2925         }
2926         return status;
2927 }
2928
2929 static void nfs4_free_createdata(struct nfs4_createdata *data)
2930 {
2931         kfree(data);
2932 }
2933
2934 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2935                 struct page *page, unsigned int len, struct iattr *sattr)
2936 {
2937         struct nfs4_createdata *data;
2938         int status = -ENAMETOOLONG;
2939
2940         if (len > NFS4_MAXPATHLEN)
2941                 goto out;
2942
2943         status = -ENOMEM;
2944         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2945         if (data == NULL)
2946                 goto out;
2947
2948         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2949         data->arg.u.symlink.pages = &page;
2950         data->arg.u.symlink.len = len;
2951
2952         status = nfs4_do_create(dir, dentry, data);
2953
2954         nfs4_free_createdata(data);
2955 out:
2956         return status;
2957 }
2958
2959 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2960                 struct page *page, unsigned int len, struct iattr *sattr)
2961 {
2962         struct nfs4_exception exception = { };
2963         int err;
2964         do {
2965                 err = nfs4_handle_exception(NFS_SERVER(dir),
2966                                 _nfs4_proc_symlink(dir, dentry, page,
2967                                                         len, sattr),
2968                                 &exception);
2969         } while (exception.retry);
2970         return err;
2971 }
2972
2973 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2974                 struct iattr *sattr)
2975 {
2976         struct nfs4_createdata *data;
2977         int status = -ENOMEM;
2978
2979         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2980         if (data == NULL)
2981                 goto out;
2982
2983         status = nfs4_do_create(dir, dentry, data);
2984
2985         nfs4_free_createdata(data);
2986 out:
2987         return status;
2988 }
2989
2990 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2991                 struct iattr *sattr)
2992 {
2993         struct nfs4_exception exception = { };
2994         int err;
2995
2996         sattr->ia_mode &= ~current_umask();
2997         do {
2998                 err = nfs4_handle_exception(NFS_SERVER(dir),
2999                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3000                                 &exception);
3001         } while (exception.retry);
3002         return err;
3003 }
3004
3005 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3006                 u64 cookie, struct page **pages, unsigned int count, int plus)
3007 {
3008         struct inode            *dir = dentry->d_inode;
3009         struct nfs4_readdir_arg args = {
3010                 .fh = NFS_FH(dir),
3011                 .pages = pages,
3012                 .pgbase = 0,
3013                 .count = count,
3014                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3015                 .plus = plus,
3016         };
3017         struct nfs4_readdir_res res;
3018         struct rpc_message msg = {
3019                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3020                 .rpc_argp = &args,
3021                 .rpc_resp = &res,
3022                 .rpc_cred = cred,
3023         };
3024         int                     status;
3025
3026         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3027                         dentry->d_parent->d_name.name,
3028                         dentry->d_name.name,
3029                         (unsigned long long)cookie);
3030         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3031         res.pgbase = args.pgbase;
3032         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3033         if (status >= 0) {
3034                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3035                 status += args.pgbase;
3036         }
3037
3038         nfs_invalidate_atime(dir);
3039
3040         dprintk("%s: returns %d\n", __func__, status);
3041         return status;
3042 }
3043
3044 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3045                 u64 cookie, struct page **pages, unsigned int count, int plus)
3046 {
3047         struct nfs4_exception exception = { };
3048         int err;
3049         do {
3050                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3051                                 _nfs4_proc_readdir(dentry, cred, cookie,
3052                                         pages, count, plus),
3053                                 &exception);
3054         } while (exception.retry);
3055         return err;
3056 }
3057
3058 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3059                 struct iattr *sattr, dev_t rdev)
3060 {
3061         struct nfs4_createdata *data;
3062         int mode = sattr->ia_mode;
3063         int status = -ENOMEM;
3064
3065         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3066         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3067
3068         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3069         if (data == NULL)
3070                 goto out;
3071
3072         if (S_ISFIFO(mode))
3073                 data->arg.ftype = NF4FIFO;
3074         else if (S_ISBLK(mode)) {
3075                 data->arg.ftype = NF4BLK;
3076                 data->arg.u.device.specdata1 = MAJOR(rdev);
3077                 data->arg.u.device.specdata2 = MINOR(rdev);
3078         }
3079         else if (S_ISCHR(mode)) {
3080                 data->arg.ftype = NF4CHR;
3081                 data->arg.u.device.specdata1 = MAJOR(rdev);
3082                 data->arg.u.device.specdata2 = MINOR(rdev);
3083         }
3084
3085         status = nfs4_do_create(dir, dentry, data);
3086
3087         nfs4_free_createdata(data);
3088 out:
3089         return status;
3090 }
3091
3092 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3093                 struct iattr *sattr, dev_t rdev)
3094 {
3095         struct nfs4_exception exception = { };
3096         int err;
3097
3098         sattr->ia_mode &= ~current_umask();
3099         do {
3100                 err = nfs4_handle_exception(NFS_SERVER(dir),
3101                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3102                                 &exception);
3103         } while (exception.retry);
3104         return err;
3105 }
3106
3107 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3108                  struct nfs_fsstat *fsstat)
3109 {
3110         struct nfs4_statfs_arg args = {
3111                 .fh = fhandle,
3112                 .bitmask = server->attr_bitmask,
3113         };
3114         struct nfs4_statfs_res res = {
3115                 .fsstat = fsstat,
3116         };
3117         struct rpc_message msg = {
3118                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3119                 .rpc_argp = &args,
3120                 .rpc_resp = &res,
3121         };
3122
3123         nfs_fattr_init(fsstat->fattr);
3124         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3125 }
3126
3127 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3128 {
3129         struct nfs4_exception exception = { };
3130         int err;
3131         do {
3132                 err = nfs4_handle_exception(server,
3133                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3134                                 &exception);
3135         } while (exception.retry);
3136         return err;
3137 }
3138
3139 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3140                 struct nfs_fsinfo *fsinfo)
3141 {
3142         struct nfs4_fsinfo_arg args = {
3143                 .fh = fhandle,
3144                 .bitmask = server->attr_bitmask,
3145         };
3146         struct nfs4_fsinfo_res res = {
3147                 .fsinfo = fsinfo,
3148         };
3149         struct rpc_message msg = {
3150                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3151                 .rpc_argp = &args,
3152                 .rpc_resp = &res,
3153         };
3154
3155         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3156 }
3157
3158 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3159 {
3160         struct nfs4_exception exception = { };
3161         int err;
3162
3163         do {
3164                 err = nfs4_handle_exception(server,
3165                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3166                                 &exception);
3167         } while (exception.retry);
3168         return err;
3169 }
3170
3171 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3172 {
3173         nfs_fattr_init(fsinfo->fattr);
3174         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3175 }
3176
3177 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3178                 struct nfs_pathconf *pathconf)
3179 {
3180         struct nfs4_pathconf_arg args = {
3181                 .fh = fhandle,
3182                 .bitmask = server->attr_bitmask,
3183         };
3184         struct nfs4_pathconf_res res = {
3185                 .pathconf = pathconf,
3186         };
3187         struct rpc_message msg = {
3188                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3189                 .rpc_argp = &args,
3190                 .rpc_resp = &res,
3191         };
3192
3193         /* None of the pathconf attributes are mandatory to implement */
3194         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3195                 memset(pathconf, 0, sizeof(*pathconf));
3196                 return 0;
3197         }
3198
3199         nfs_fattr_init(pathconf->fattr);
3200         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3201 }
3202
3203 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3204                 struct nfs_pathconf *pathconf)
3205 {
3206         struct nfs4_exception exception = { };
3207         int err;
3208
3209         do {
3210                 err = nfs4_handle_exception(server,
3211                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3212                                 &exception);
3213         } while (exception.retry);
3214         return err;
3215 }
3216
3217 void __nfs4_read_done_cb(struct nfs_read_data *data)
3218 {
3219         nfs_invalidate_atime(data->inode);
3220 }
3221
3222 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3223 {
3224         struct nfs_server *server = NFS_SERVER(data->inode);
3225
3226         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3227                 rpc_restart_call_prepare(task);
3228                 return -EAGAIN;
3229         }
3230
3231         __nfs4_read_done_cb(data);
3232         if (task->tk_status > 0)
3233                 renew_lease(server, data->timestamp);
3234         return 0;
3235 }
3236
3237 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3238 {
3239
3240         dprintk("--> %s\n", __func__);
3241
3242         if (!nfs4_sequence_done(task, &data->res.seq_res))
3243                 return -EAGAIN;
3244
3245         return data->read_done_cb ? data->read_done_cb(task, data) :
3246                                     nfs4_read_done_cb(task, data);
3247 }
3248
3249 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3250 {
3251         data->timestamp   = jiffies;
3252         data->read_done_cb = nfs4_read_done_cb;
3253         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3254         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3255 }
3256
3257 /* Reset the the nfs_read_data to send the read to the MDS. */
3258 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3259 {
3260         dprintk("%s Reset task for i/o through\n", __func__);
3261         put_lseg(data->lseg);
3262         data->lseg = NULL;
3263         /* offsets will differ in the dense stripe case */
3264         data->args.offset = data->mds_offset;
3265         data->ds_clp = NULL;
3266         data->args.fh     = NFS_FH(data->inode);
3267         data->read_done_cb = nfs4_read_done_cb;
3268         task->tk_ops = data->mds_ops;
3269         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3270 }
3271 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3272
3273 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3274 {
3275         struct inode *inode = data->inode;
3276
3277         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3278                 rpc_restart_call_prepare(task);
3279                 return -EAGAIN;
3280         }
3281         if (task->tk_status >= 0) {
3282                 renew_lease(NFS_SERVER(inode), data->timestamp);
3283                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3284         }
3285         return 0;
3286 }
3287
3288 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3289 {
3290         if (!nfs4_sequence_done(task, &data->res.seq_res))
3291                 return -EAGAIN;
3292         return data->write_done_cb ? data->write_done_cb(task, data) :
3293                 nfs4_write_done_cb(task, data);
3294 }
3295
3296 /* Reset the the nfs_write_data to send the write to the MDS. */
3297 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3298 {
3299         dprintk("%s Reset task for i/o through\n", __func__);
3300         put_lseg(data->lseg);
3301         data->lseg          = NULL;
3302         data->ds_clp        = NULL;
3303         data->write_done_cb = nfs4_write_done_cb;
3304         data->args.fh       = NFS_FH(data->inode);
3305         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3306         data->args.offset   = data->mds_offset;
3307         data->res.fattr     = &data->fattr;
3308         task->tk_ops        = data->mds_ops;
3309         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3310 }
3311 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3312
3313 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3314 {
3315         struct nfs_server *server = NFS_SERVER(data->inode);
3316
3317         if (data->lseg) {
3318                 data->args.bitmask = NULL;
3319                 data->res.fattr = NULL;
3320         } else
3321                 data->args.bitmask = server->cache_consistency_bitmask;
3322         if (!data->write_done_cb)
3323                 data->write_done_cb = nfs4_write_done_cb;
3324         data->res.server = server;
3325         data->timestamp   = jiffies;
3326
3327         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3328         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3329 }
3330
3331 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3332 {
3333         struct inode *inode = data->inode;
3334
3335         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3336                 rpc_restart_call_prepare(task);
3337                 return -EAGAIN;
3338         }
3339         nfs_refresh_inode(inode, data->res.fattr);
3340         return 0;
3341 }
3342
3343 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3344 {
3345         if (!nfs4_sequence_done(task, &data->res.seq_res))
3346                 return -EAGAIN;
3347         return data->write_done_cb(task, data);
3348 }
3349
3350 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3351 {
3352         struct nfs_server *server = NFS_SERVER(data->inode);
3353
3354         if (data->lseg) {
3355                 data->args.bitmask = NULL;
3356                 data->res.fattr = NULL;
3357         } else
3358                 data->args.bitmask = server->cache_consistency_bitmask;
3359         if (!data->write_done_cb)
3360                 data->write_done_cb = nfs4_commit_done_cb;
3361         data->res.server = server;
3362         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3363         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3364 }
3365
3366 struct nfs4_renewdata {
3367         struct nfs_client       *client;
3368         unsigned long           timestamp;
3369 };
3370
3371 /*
3372  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3373  * standalone procedure for queueing an asynchronous RENEW.
3374  */
3375 static void nfs4_renew_release(void *calldata)
3376 {
3377         struct nfs4_renewdata *data = calldata;
3378         struct nfs_client *clp = data->client;
3379
3380         if (atomic_read(&clp->cl_count) > 1)
3381                 nfs4_schedule_state_renewal(clp);
3382         nfs_put_client(clp);
3383         kfree(data);
3384 }
3385
3386 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3387 {
3388         struct nfs4_renewdata *data = calldata;
3389         struct nfs_client *clp = data->client;
3390         unsigned long timestamp = data->timestamp;
3391
3392         if (task->tk_status < 0) {
3393                 /* Unless we're shutting down, schedule state recovery! */
3394                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3395                         return;
3396                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3397                         nfs4_schedule_lease_recovery(clp);
3398                         return;
3399                 }
3400                 nfs4_schedule_path_down_recovery(clp);
3401         }
3402         do_renew_lease(clp, timestamp);
3403 }
3404
3405 static const struct rpc_call_ops nfs4_renew_ops = {
3406         .rpc_call_done = nfs4_renew_done,
3407         .rpc_release = nfs4_renew_release,
3408 };
3409
3410 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3411 {
3412         struct rpc_message msg = {
3413                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3414                 .rpc_argp       = clp,
3415                 .rpc_cred       = cred,
3416         };
3417         struct nfs4_renewdata *data;
3418
3419         if (renew_flags == 0)
3420                 return 0;
3421         if (!atomic_inc_not_zero(&clp->cl_count))
3422                 return -EIO;
3423         data = kmalloc(sizeof(*data), GFP_NOFS);
3424         if (data == NULL)
3425                 return -ENOMEM;
3426         data->client = clp;
3427         data->timestamp = jiffies;
3428         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3429                         &nfs4_renew_ops, data);
3430 }
3431
3432 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3433 {
3434         struct rpc_message msg = {
3435                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3436                 .rpc_argp       = clp,
3437                 .rpc_cred       = cred,
3438         };
3439         unsigned long now = jiffies;
3440         int status;
3441
3442         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3443         if (status < 0)
3444                 return status;
3445         do_renew_lease(clp, now);
3446         return 0;
3447 }
3448
3449 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3450 {
3451         return (server->caps & NFS_CAP_ACLS)
3452                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3453                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3454 }
3455
3456 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3457  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3458  * the stack.
3459  */
3460 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3461
3462 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3463                 struct page **pages, unsigned int *pgbase)
3464 {
3465         struct page *newpage, **spages;
3466         int rc = 0;
3467         size_t len;
3468         spages = pages;
3469
3470         do {
3471                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3472                 newpage = alloc_page(GFP_KERNEL);
3473
3474                 if (newpage == NULL)
3475                         goto unwind;
3476                 memcpy(page_address(newpage), buf, len);
3477                 buf += len;
3478                 buflen -= len;
3479                 *pages++ = newpage;
3480                 rc++;
3481         } while (buflen != 0);
3482
3483         return rc;
3484
3485 unwind:
3486         for(; rc > 0; rc--)
3487                 __free_page(spages[rc-1]);
3488         return -ENOMEM;
3489 }
3490
3491 struct nfs4_cached_acl {
3492         int cached;
3493         size_t len;
3494         char data[0];
3495 };
3496
3497 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3498 {
3499         struct nfs_inode *nfsi = NFS_I(inode);
3500
3501         spin_lock(&inode->i_lock);
3502         kfree(nfsi->nfs4_acl);
3503         nfsi->nfs4_acl = acl;
3504         spin_unlock(&inode->i_lock);
3505 }
3506
3507 static void nfs4_zap_acl_attr(struct inode *inode)
3508 {
3509         nfs4_set_cached_acl(inode, NULL);
3510 }
3511
3512 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3513 {
3514         struct nfs_inode *nfsi = NFS_I(inode);
3515         struct nfs4_cached_acl *acl;
3516         int ret = -ENOENT;
3517
3518         spin_lock(&inode->i_lock);
3519         acl = nfsi->nfs4_acl;
3520         if (acl == NULL)
3521                 goto out;
3522         if (buf == NULL) /* user is just asking for length */
3523                 goto out_len;
3524         if (acl->cached == 0)
3525                 goto out;
3526         ret = -ERANGE; /* see getxattr(2) man page */
3527         if (acl->len > buflen)
3528                 goto out;
3529         memcpy(buf, acl->data, acl->len);
3530 out_len:
3531         ret = acl->len;
3532 out:
3533         spin_unlock(&inode->i_lock);
3534         return ret;
3535 }
3536
3537 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3538 {
3539         struct nfs4_cached_acl *acl;
3540
3541         if (buf && acl_len <= PAGE_SIZE) {
3542                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3543                 if (acl == NULL)
3544                         goto out;
3545                 acl->cached = 1;
3546                 memcpy(acl->data, buf, acl_len);
3547         } else {
3548                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3549                 if (acl == NULL)
3550                         goto out;
3551                 acl->cached = 0;
3552         }
3553         acl->len = acl_len;
3554 out:
3555         nfs4_set_cached_acl(inode, acl);
3556 }
3557
3558 /*
3559  * The getxattr API returns the required buffer length when called with a
3560  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3561  * the required buf.  On a NULL buf, we send a page of data to the server
3562  * guessing that the ACL request can be serviced by a page. If so, we cache
3563  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3564  * the cache. If not so, we throw away the page, and cache the required
3565  * length. The next getxattr call will then produce another round trip to
3566  * the server, this time with the input buf of the required size.
3567  */
3568 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3569 {
3570         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3571         struct nfs_getaclargs args = {
3572                 .fh = NFS_FH(inode),
3573                 .acl_pages = pages,
3574                 .acl_len = buflen,
3575         };
3576         struct nfs_getaclres res = {
3577                 .acl_len = buflen,
3578         };
3579         void *resp_buf;
3580         struct rpc_message msg = {
3581                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3582                 .rpc_argp = &args,
3583                 .rpc_resp = &res,
3584         };
3585         int ret = -ENOMEM, npages, i, acl_len = 0;
3586
3587         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3588         /* As long as we're doing a round trip to the server anyway,
3589          * let's be prepared for a page of acl data. */
3590         if (npages == 0)
3591                 npages = 1;
3592
3593         for (i = 0; i < npages; i++) {
3594                 pages[i] = alloc_page(GFP_KERNEL);
3595                 if (!pages[i])
3596                         goto out_free;
3597         }
3598         if (npages > 1) {
3599                 /* for decoding across pages */
3600                 args.acl_scratch = alloc_page(GFP_KERNEL);
3601                 if (!args.acl_scratch)
3602                         goto out_free;
3603         }
3604         args.acl_len = npages * PAGE_SIZE;
3605         args.acl_pgbase = 0;
3606         /* Let decode_getfacl know not to fail if the ACL data is larger than
3607          * the page we send as a guess */
3608         if (buf == NULL)
3609                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3610         resp_buf = page_address(pages[0]);
3611
3612         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3613                 __func__, buf, buflen, npages, args.acl_len);
3614         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3615                              &msg, &args.seq_args, &res.seq_res, 0);
3616         if (ret)
3617                 goto out_free;
3618
3619         acl_len = res.acl_len - res.acl_data_offset;
3620         if (acl_len > args.acl_len)
3621                 nfs4_write_cached_acl(inode, NULL, acl_len);
3622         else
3623                 nfs4_write_cached_acl(inode, resp_buf + res.acl_data_offset,
3624                                       acl_len);
3625         if (buf) {
3626                 ret = -ERANGE;
3627                 if (acl_len > buflen)
3628                         goto out_free;
3629                 _copy_from_pages(buf, pages, res.acl_data_offset,
3630                                 res.acl_len);
3631         }
3632         ret = acl_len;
3633 out_free:
3634         for (i = 0; i < npages; i++)
3635                 if (pages[i])
3636                         __free_page(pages[i]);
3637         if (args.acl_scratch)
3638                 __free_page(args.acl_scratch);
3639         return ret;
3640 }
3641
3642 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3643 {
3644         struct nfs4_exception exception = { };
3645         ssize_t ret;
3646         do {
3647                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3648                 if (ret >= 0)
3649                         break;
3650                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3651         } while (exception.retry);
3652         return ret;
3653 }
3654
3655 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3656 {
3657         struct nfs_server *server = NFS_SERVER(inode);
3658         int ret;
3659
3660         if (!nfs4_server_supports_acls(server))
3661                 return -EOPNOTSUPP;
3662         ret = nfs_revalidate_inode(server, inode);
3663         if (ret < 0)
3664                 return ret;
3665         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3666                 nfs_zap_acl_cache(inode);
3667         ret = nfs4_read_cached_acl(inode, buf, buflen);
3668         if (ret != -ENOENT)
3669                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3670                  * but no cached acl data, just the acl length */
3671                 return ret;
3672         return nfs4_get_acl_uncached(inode, buf, buflen);
3673 }
3674
3675 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3676 {
3677         struct nfs_server *server = NFS_SERVER(inode);
3678         struct page *pages[NFS4ACL_MAXPAGES];
3679         struct nfs_setaclargs arg = {
3680                 .fh             = NFS_FH(inode),
3681                 .acl_pages      = pages,
3682                 .acl_len        = buflen,
3683         };
3684         struct nfs_setaclres res;
3685         struct rpc_message msg = {
3686                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3687                 .rpc_argp       = &arg,
3688                 .rpc_resp       = &res,
3689         };
3690         int ret, i;
3691
3692         if (!nfs4_server_supports_acls(server))
3693                 return -EOPNOTSUPP;
3694         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3695         if (i < 0)
3696                 return i;
3697         nfs_inode_return_delegation(inode);
3698         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3699
3700         /*
3701          * Free each page after tx, so the only ref left is
3702          * held by the network stack
3703          */
3704         for (; i > 0; i--)
3705                 put_page(pages[i-1]);
3706
3707         /*
3708          * Acl update can result in inode attribute update.
3709          * so mark the attribute cache invalid.
3710          */
3711         spin_lock(&inode->i_lock);
3712         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3713         spin_unlock(&inode->i_lock);
3714         nfs_access_zap_cache(inode);
3715         nfs_zap_acl_cache(inode);
3716         return ret;
3717 }
3718
3719 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3720 {
3721         struct nfs4_exception exception = { };
3722         int err;
3723         do {
3724                 err = nfs4_handle_exception(NFS_SERVER(inode),
3725                                 __nfs4_proc_set_acl(inode, buf, buflen),
3726                                 &exception);
3727         } while (exception.retry);
3728         return err;
3729 }
3730
3731 static int
3732 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3733 {
3734         struct nfs_client *clp = server->nfs_client;
3735
3736         if (task->tk_status >= 0)
3737                 return 0;
3738         switch(task->tk_status) {
3739                 case -NFS4ERR_ADMIN_REVOKED:
3740                 case -NFS4ERR_BAD_STATEID:
3741                 case -NFS4ERR_OPENMODE:
3742                         if (state == NULL)
3743                                 break;
3744                         nfs4_schedule_stateid_recovery(server, state);
3745                         goto wait_on_recovery;
3746                 case -NFS4ERR_EXPIRED:
3747                         if (state != NULL)
3748                                 nfs4_schedule_stateid_recovery(server, state);
3749                 case -NFS4ERR_STALE_STATEID:
3750                 case -NFS4ERR_STALE_CLIENTID:
3751                         nfs4_schedule_lease_recovery(clp);
3752                         goto wait_on_recovery;
3753 #if defined(CONFIG_NFS_V4_1)
3754                 case -NFS4ERR_BADSESSION:
3755                 case -NFS4ERR_BADSLOT:
3756                 case -NFS4ERR_BAD_HIGH_SLOT:
3757                 case -NFS4ERR_DEADSESSION:
3758                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3759                 case -NFS4ERR_SEQ_FALSE_RETRY:
3760                 case -NFS4ERR_SEQ_MISORDERED:
3761                         dprintk("%s ERROR %d, Reset session\n", __func__,
3762                                 task->tk_status);
3763                         nfs4_schedule_session_recovery(clp->cl_session);
3764                         task->tk_status = 0;
3765                         return -EAGAIN;
3766 #endif /* CONFIG_NFS_V4_1 */
3767                 case -NFS4ERR_DELAY:
3768                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3769                 case -NFS4ERR_GRACE:
3770                 case -EKEYEXPIRED:
3771                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3772                         task->tk_status = 0;
3773                         return -EAGAIN;
3774                 case -NFS4ERR_RETRY_UNCACHED_REP:
3775                 case -NFS4ERR_OLD_STATEID:
3776                         task->tk_status = 0;
3777                         return -EAGAIN;
3778         }
3779         task->tk_status = nfs4_map_errors(task->tk_status);
3780         return 0;
3781 wait_on_recovery:
3782         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3783         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3784                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3785         task->tk_status = 0;
3786         return -EAGAIN;
3787 }
3788
3789 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3790                 unsigned short port, struct rpc_cred *cred,
3791                 struct nfs4_setclientid_res *res)
3792 {
3793         nfs4_verifier sc_verifier;
3794         struct nfs4_setclientid setclientid = {
3795                 .sc_verifier = &sc_verifier,
3796                 .sc_prog = program,
3797                 .sc_cb_ident = clp->cl_cb_ident,
3798         };
3799         struct rpc_message msg = {
3800                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3801                 .rpc_argp = &setclientid,
3802                 .rpc_resp = res,
3803                 .rpc_cred = cred,
3804         };
3805         __be32 *p;
3806         int loop = 0;
3807         int status;
3808
3809         p = (__be32*)sc_verifier.data;
3810         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3811         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3812
3813         for(;;) {
3814                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3815                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3816                                 clp->cl_ipaddr,
3817                                 rpc_peeraddr2str(clp->cl_rpcclient,
3818                                                         RPC_DISPLAY_ADDR),
3819                                 rpc_peeraddr2str(clp->cl_rpcclient,
3820                                                         RPC_DISPLAY_PROTO),
3821                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3822                                 clp->cl_id_uniquifier);
3823                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3824                                 sizeof(setclientid.sc_netid),
3825                                 rpc_peeraddr2str(clp->cl_rpcclient,
3826                                                         RPC_DISPLAY_NETID));
3827                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3828                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3829                                 clp->cl_ipaddr, port >> 8, port & 255);
3830
3831                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3832                 if (status != -NFS4ERR_CLID_INUSE)
3833                         break;
3834                 if (loop != 0) {
3835                         ++clp->cl_id_uniquifier;
3836                         break;
3837                 }
3838                 ++loop;
3839                 ssleep(clp->cl_lease_time / HZ + 1);
3840         }
3841         return status;
3842 }
3843
3844 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3845                 struct nfs4_setclientid_res *arg,
3846                 struct rpc_cred *cred)
3847 {
3848         struct nfs_fsinfo fsinfo;
3849         struct rpc_message msg = {
3850                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3851                 .rpc_argp = arg,
3852                 .rpc_resp = &fsinfo,
3853                 .rpc_cred = cred,
3854         };
3855         unsigned long now;
3856         int status;
3857
3858         now = jiffies;
3859         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3860         if (status == 0) {
3861                 spin_lock(&clp->cl_lock);
3862                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3863                 clp->cl_last_renewal = now;
3864                 spin_unlock(&clp->cl_lock);
3865         }
3866         return status;
3867 }
3868
3869 struct nfs4_delegreturndata {
3870         struct nfs4_delegreturnargs args;
3871         struct nfs4_delegreturnres res;
3872         struct nfs_fh fh;
3873         nfs4_stateid stateid;
3874         unsigned long timestamp;
3875         struct nfs_fattr fattr;
3876         int rpc_status;
3877 };
3878
3879 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3880 {
3881         struct nfs4_delegreturndata *data = calldata;
3882
3883         if (!nfs4_sequence_done(task, &data->res.seq_res))
3884                 return;
3885
3886         switch (task->tk_status) {
3887         case -NFS4ERR_STALE_STATEID:
3888         case -NFS4ERR_EXPIRED:
3889         case 0:
3890                 renew_lease(data->res.server, data->timestamp);
3891                 break;
3892         default:
3893                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3894                                 -EAGAIN) {
3895                         rpc_restart_call_prepare(task);
3896                         return;
3897                 }
3898         }
3899         data->rpc_status = task->tk_status;
3900 }
3901
3902 static void nfs4_delegreturn_release(void *calldata)
3903 {
3904         kfree(calldata);
3905 }
3906
3907 #if defined(CONFIG_NFS_V4_1)
3908 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3909 {
3910         struct nfs4_delegreturndata *d_data;
3911
3912         d_data = (struct nfs4_delegreturndata *)data;
3913
3914         if (nfs4_setup_sequence(d_data->res.server,
3915                                 &d_data->args.seq_args,
3916                                 &d_data->res.seq_res, task))
3917                 return;
3918         rpc_call_start(task);
3919 }
3920 #endif /* CONFIG_NFS_V4_1 */
3921
3922 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3923 #if defined(CONFIG_NFS_V4_1)
3924         .rpc_call_prepare = nfs4_delegreturn_prepare,
3925 #endif /* CONFIG_NFS_V4_1 */
3926         .rpc_call_done = nfs4_delegreturn_done,
3927         .rpc_release = nfs4_delegreturn_release,
3928 };
3929
3930 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3931 {
3932         struct nfs4_delegreturndata *data;
3933         struct nfs_server *server = NFS_SERVER(inode);
3934         struct rpc_task *task;
3935         struct rpc_message msg = {
3936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3937                 .rpc_cred = cred,
3938         };
3939         struct rpc_task_setup task_setup_data = {
3940                 .rpc_client = server->client,
3941                 .rpc_message = &msg,
3942                 .callback_ops = &nfs4_delegreturn_ops,
3943                 .flags = RPC_TASK_ASYNC,
3944         };
3945         int status = 0;
3946
3947         data = kzalloc(sizeof(*data), GFP_NOFS);
3948         if (data == NULL)
3949                 return -ENOMEM;
3950         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3951         data->args.fhandle = &data->fh;
3952         data->args.stateid = &data->stateid;
3953         data->args.bitmask = server->attr_bitmask;
3954         nfs_copy_fh(&data->fh, NFS_FH(inode));
3955         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3956         data->res.fattr = &data->fattr;
3957         data->res.server = server;
3958         nfs_fattr_init(data->res.fattr);
3959         data->timestamp = jiffies;
3960         data->rpc_status = 0;
3961
3962         task_setup_data.callback_data = data;
3963         msg.rpc_argp = &data->args;
3964         msg.rpc_resp = &data->res;
3965         task = rpc_run_task(&task_setup_data);
3966         if (IS_ERR(task))
3967                 return PTR_ERR(task);
3968         if (!issync)
3969                 goto out;
3970         status = nfs4_wait_for_completion_rpc_task(task);
3971         if (status != 0)
3972                 goto out;
3973         status = data->rpc_status;
3974         if (status != 0)
3975                 goto out;
3976         nfs_refresh_inode(inode, &data->fattr);
3977 out:
3978         rpc_put_task(task);
3979         return status;
3980 }
3981
3982 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3983 {
3984         struct nfs_server *server = NFS_SERVER(inode);
3985         struct nfs4_exception exception = { };
3986         int err;
3987         do {
3988                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3989                 switch (err) {
3990                         case -NFS4ERR_STALE_STATEID:
3991                         case -NFS4ERR_EXPIRED:
3992                         case 0:
3993                                 return 0;
3994                 }
3995                 err = nfs4_handle_exception(server, err, &exception);
3996         } while (exception.retry);
3997         return err;
3998 }
3999
4000 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4001 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4002
4003 /*
4004  * sleep, with exponential backoff, and retry the LOCK operation.
4005  */
4006 static unsigned long
4007 nfs4_set_lock_task_retry(unsigned long timeout)
4008 {
4009         freezable_schedule_timeout_killable(timeout);
4010         timeout <<= 1;
4011         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4012                 return NFS4_LOCK_MAXTIMEOUT;
4013         return timeout;
4014 }
4015
4016 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4017 {
4018         struct inode *inode = state->inode;
4019         struct nfs_server *server = NFS_SERVER(inode);
4020         struct nfs_client *clp = server->nfs_client;
4021         struct nfs_lockt_args arg = {
4022                 .fh = NFS_FH(inode),
4023                 .fl = request,
4024         };
4025         struct nfs_lockt_res res = {
4026                 .denied = request,
4027         };
4028         struct rpc_message msg = {
4029                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4030                 .rpc_argp       = &arg,
4031                 .rpc_resp       = &res,
4032                 .rpc_cred       = state->owner->so_cred,
4033         };
4034         struct nfs4_lock_state *lsp;
4035         int status;
4036
4037         arg.lock_owner.clientid = clp->cl_clientid;
4038         status = nfs4_set_lock_state(state, request);
4039         if (status != 0)
4040                 goto out;
4041         lsp = request->fl_u.nfs4_fl.owner;
4042         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4043         arg.lock_owner.s_dev = server->s_dev;
4044         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4045         switch (status) {
4046                 case 0:
4047                         request->fl_type = F_UNLCK;
4048                         break;
4049                 case -NFS4ERR_DENIED:
4050                         status = 0;
4051         }
4052         request->fl_ops->fl_release_private(request);
4053 out:
4054         return status;
4055 }
4056
4057 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4058 {
4059         struct nfs4_exception exception = { };
4060         int err;
4061
4062         do {
4063                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4064                                 _nfs4_proc_getlk(state, cmd, request),
4065                                 &exception);
4066         } while (exception.retry);
4067         return err;
4068 }
4069
4070 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4071 {
4072         int res = 0;
4073         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4074                 case FL_POSIX:
4075                         res = posix_lock_file_wait(file, fl);
4076                         break;
4077                 case FL_FLOCK:
4078                         res = flock_lock_file_wait(file, fl);
4079                         break;
4080                 default:
4081                         BUG();
4082         }
4083         return res;
4084 }
4085
4086 struct nfs4_unlockdata {
4087         struct nfs_locku_args arg;
4088         struct nfs_locku_res res;
4089         struct nfs4_lock_state *lsp;
4090         struct nfs_open_context *ctx;
4091         struct file_lock fl;
4092         const struct nfs_server *server;
4093         unsigned long timestamp;
4094 };
4095
4096 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4097                 struct nfs_open_context *ctx,
4098                 struct nfs4_lock_state *lsp,
4099                 struct nfs_seqid *seqid)
4100 {
4101         struct nfs4_unlockdata *p;
4102         struct inode *inode = lsp->ls_state->inode;
4103
4104         p = kzalloc(sizeof(*p), GFP_NOFS);
4105         if (p == NULL)
4106                 return NULL;
4107         p->arg.fh = NFS_FH(inode);
4108         p->arg.fl = &p->fl;
4109         p->arg.seqid = seqid;
4110         p->res.seqid = seqid;
4111         p->arg.stateid = &lsp->ls_stateid;
4112         p->lsp = lsp;
4113         atomic_inc(&lsp->ls_count);
4114         /* Ensure we don't close file until we're done freeing locks! */
4115         p->ctx = get_nfs_open_context(ctx);
4116         memcpy(&p->fl, fl, sizeof(p->fl));
4117         p->server = NFS_SERVER(inode);
4118         return p;
4119 }
4120
4121 static void nfs4_locku_release_calldata(void *data)
4122 {
4123         struct nfs4_unlockdata *calldata = data;
4124         nfs_free_seqid(calldata->arg.seqid);
4125         nfs4_put_lock_state(calldata->lsp);
4126         put_nfs_open_context(calldata->ctx);
4127         kfree(calldata);
4128 }
4129
4130 static void nfs4_locku_done(struct rpc_task *task, void *data)
4131 {
4132         struct nfs4_unlockdata *calldata = data;
4133
4134         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4135                 return;
4136         switch (task->tk_status) {
4137                 case 0:
4138                         memcpy(calldata->lsp->ls_stateid.data,
4139                                         calldata->res.stateid.data,
4140                                         sizeof(calldata->lsp->ls_stateid.data));
4141                         renew_lease(calldata->server, calldata->timestamp);
4142                         break;
4143                 case -NFS4ERR_BAD_STATEID:
4144                 case -NFS4ERR_OLD_STATEID:
4145                 case -NFS4ERR_STALE_STATEID:
4146                 case -NFS4ERR_EXPIRED:
4147                         break;
4148                 default:
4149                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4150                                 rpc_restart_call_prepare(task);
4151         }
4152 }
4153
4154 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4155 {
4156         struct nfs4_unlockdata *calldata = data;
4157
4158         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4159                 return;
4160         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4161                 /* Note: exit _without_ running nfs4_locku_done */
4162                 task->tk_action = NULL;
4163                 return;
4164         }
4165         calldata->timestamp = jiffies;
4166         if (nfs4_setup_sequence(calldata->server,
4167                                 &calldata->arg.seq_args,
4168                                 &calldata->res.seq_res, task))
4169                 return;
4170         rpc_call_start(task);
4171 }
4172
4173 static const struct rpc_call_ops nfs4_locku_ops = {
4174         .rpc_call_prepare = nfs4_locku_prepare,
4175         .rpc_call_done = nfs4_locku_done,
4176         .rpc_release = nfs4_locku_release_calldata,
4177 };
4178
4179 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4180                 struct nfs_open_context *ctx,
4181                 struct nfs4_lock_state *lsp,
4182                 struct nfs_seqid *seqid)
4183 {
4184         struct nfs4_unlockdata *data;
4185         struct rpc_message msg = {
4186                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4187                 .rpc_cred = ctx->cred,
4188         };
4189         struct rpc_task_setup task_setup_data = {
4190                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4191                 .rpc_message = &msg,
4192                 .callback_ops = &nfs4_locku_ops,
4193                 .workqueue = nfsiod_workqueue,
4194                 .flags = RPC_TASK_ASYNC,
4195         };
4196
4197         /* Ensure this is an unlock - when canceling a lock, the
4198          * canceled lock is passed in, and it won't be an unlock.
4199          */
4200         fl->fl_type = F_UNLCK;
4201
4202         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4203         if (data == NULL) {
4204                 nfs_free_seqid(seqid);
4205                 return ERR_PTR(-ENOMEM);
4206         }
4207
4208         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4209         msg.rpc_argp = &data->arg;
4210         msg.rpc_resp = &data->res;
4211         task_setup_data.callback_data = data;
4212         return rpc_run_task(&task_setup_data);
4213 }
4214
4215 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4216 {
4217         struct nfs_inode *nfsi = NFS_I(state->inode);
4218         struct nfs_seqid *seqid;
4219         struct nfs4_lock_state *lsp;
4220         struct rpc_task *task;
4221         int status = 0;
4222         unsigned char fl_flags = request->fl_flags;
4223
4224         status = nfs4_set_lock_state(state, request);
4225         /* Unlock _before_ we do the RPC call */
4226         request->fl_flags |= FL_EXISTS;
4227         down_read(&nfsi->rwsem);
4228         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4229                 up_read(&nfsi->rwsem);
4230                 goto out;
4231         }
4232         up_read(&nfsi->rwsem);
4233         if (status != 0)
4234                 goto out;
4235         /* Is this a delegated lock? */
4236         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4237                 goto out;
4238         lsp = request->fl_u.nfs4_fl.owner;
4239         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4240         status = -ENOMEM;
4241         if (seqid == NULL)
4242                 goto out;
4243         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4244         status = PTR_ERR(task);
4245         if (IS_ERR(task))
4246                 goto out;
4247         status = nfs4_wait_for_completion_rpc_task(task);
4248         rpc_put_task(task);
4249 out:
4250         request->fl_flags = fl_flags;
4251         return status;
4252 }
4253
4254 struct nfs4_lockdata {
4255         struct nfs_lock_args arg;
4256         struct nfs_lock_res res;
4257         struct nfs4_lock_state *lsp;
4258         struct nfs_open_context *ctx;
4259         struct file_lock fl;
4260         unsigned long timestamp;
4261         int rpc_status;
4262         int cancelled;
4263         struct nfs_server *server;
4264 };
4265
4266 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4267                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4268                 gfp_t gfp_mask)
4269 {
4270         struct nfs4_lockdata *p;
4271         struct inode *inode = lsp->ls_state->inode;
4272         struct nfs_server *server = NFS_SERVER(inode);
4273
4274         p = kzalloc(sizeof(*p), gfp_mask);
4275         if (p == NULL)
4276                 return NULL;
4277
4278         p->arg.fh = NFS_FH(inode);
4279         p->arg.fl = &p->fl;
4280         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4281         if (p->arg.open_seqid == NULL)
4282                 goto out_free;
4283         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4284         if (p->arg.lock_seqid == NULL)
4285                 goto out_free_seqid;
4286         p->arg.lock_stateid = &lsp->ls_stateid;
4287         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4288         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4289         p->arg.lock_owner.s_dev = server->s_dev;
4290         p->res.lock_seqid = p->arg.lock_seqid;
4291         p->lsp = lsp;
4292         p->server = server;
4293         atomic_inc(&lsp->ls_count);
4294         p->ctx = get_nfs_open_context(ctx);
4295         memcpy(&p->fl, fl, sizeof(p->fl));
4296         return p;
4297 out_free_seqid:
4298         nfs_free_seqid(p->arg.open_seqid);
4299 out_free:
4300         kfree(p);
4301         return NULL;
4302 }
4303
4304 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4305 {
4306         struct nfs4_lockdata *data = calldata;
4307         struct nfs4_state *state = data->lsp->ls_state;
4308
4309         dprintk("%s: begin!\n", __func__);
4310         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4311                 return;
4312         /* Do we need to do an open_to_lock_owner? */
4313         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4314                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4315                         return;
4316                 data->arg.open_stateid = &state->stateid;
4317                 data->arg.new_lock_owner = 1;
4318                 data->res.open_seqid = data->arg.open_seqid;
4319         } else
4320                 data->arg.new_lock_owner = 0;
4321         data->timestamp = jiffies;
4322         if (nfs4_setup_sequence(data->server,
4323                                 &data->arg.seq_args,
4324                                 &data->res.seq_res, task))
4325                 return;
4326         rpc_call_start(task);
4327         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4328 }
4329
4330 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4331 {
4332         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4333         nfs4_lock_prepare(task, calldata);
4334 }
4335
4336 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4337 {
4338         struct nfs4_lockdata *data = calldata;
4339
4340         dprintk("%s: begin!\n", __func__);
4341
4342         if (!nfs4_sequence_done(task, &data->res.seq_res))
4343                 return;
4344
4345         data->rpc_status = task->tk_status;
4346         if (data->arg.new_lock_owner != 0) {
4347                 if (data->rpc_status == 0)
4348                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4349                 else
4350                         goto out;
4351         }
4352         if (data->rpc_status == 0) {
4353                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4354                                         sizeof(data->lsp->ls_stateid.data));
4355                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4356                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4357         }
4358 out:
4359         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4360 }
4361
4362 static void nfs4_lock_release(void *calldata)
4363 {
4364         struct nfs4_lockdata *data = calldata;
4365
4366         dprintk("%s: begin!\n", __func__);
4367         nfs_free_seqid(data->arg.open_seqid);
4368         if (data->cancelled != 0) {
4369                 struct rpc_task *task;
4370                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4371                                 data->arg.lock_seqid);
4372                 if (!IS_ERR(task))
4373                         rpc_put_task_async(task);
4374                 dprintk("%s: cancelling lock!\n", __func__);
4375         } else
4376                 nfs_free_seqid(data->arg.lock_seqid);
4377         nfs4_put_lock_state(data->lsp);
4378         put_nfs_open_context(data->ctx);
4379         kfree(data);
4380         dprintk("%s: done!\n", __func__);
4381 }
4382
4383 static const struct rpc_call_ops nfs4_lock_ops = {
4384         .rpc_call_prepare = nfs4_lock_prepare,
4385         .rpc_call_done = nfs4_lock_done,
4386         .rpc_release = nfs4_lock_release,
4387 };
4388
4389 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4390         .rpc_call_prepare = nfs4_recover_lock_prepare,
4391         .rpc_call_done = nfs4_lock_done,
4392         .rpc_release = nfs4_lock_release,
4393 };
4394
4395 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4396 {
4397         switch (error) {
4398         case -NFS4ERR_ADMIN_REVOKED:
4399         case -NFS4ERR_BAD_STATEID:
4400                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4401                 if (new_lock_owner != 0 ||
4402                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4403                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4404                 break;
4405         case -NFS4ERR_STALE_STATEID:
4406                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4407         case -NFS4ERR_EXPIRED:
4408                 nfs4_schedule_lease_recovery(server->nfs_client);
4409         };
4410 }
4411
4412 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4413 {
4414         struct nfs4_lockdata *data;
4415         struct rpc_task *task;
4416         struct rpc_message msg = {
4417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4418                 .rpc_cred = state->owner->so_cred,
4419         };
4420         struct rpc_task_setup task_setup_data = {
4421                 .rpc_client = NFS_CLIENT(state->inode),
4422                 .rpc_message = &msg,
4423                 .callback_ops = &nfs4_lock_ops,
4424                 .workqueue = nfsiod_workqueue,
4425                 .flags = RPC_TASK_ASYNC,
4426         };
4427         int ret;
4428
4429         dprintk("%s: begin!\n", __func__);
4430         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4431                         fl->fl_u.nfs4_fl.owner,
4432                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4433         if (data == NULL)
4434                 return -ENOMEM;
4435         if (IS_SETLKW(cmd))
4436                 data->arg.block = 1;
4437         if (recovery_type > NFS_LOCK_NEW) {
4438                 if (recovery_type == NFS_LOCK_RECLAIM)
4439                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4440                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4441         }
4442         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4443         msg.rpc_argp = &data->arg;
4444         msg.rpc_resp = &data->res;
4445         task_setup_data.callback_data = data;
4446         task = rpc_run_task(&task_setup_data);
4447         if (IS_ERR(task))
4448                 return PTR_ERR(task);
4449         ret = nfs4_wait_for_completion_rpc_task(task);
4450         if (ret == 0) {
4451                 ret = data->rpc_status;
4452                 if (ret)
4453                         nfs4_handle_setlk_error(data->server, data->lsp,
4454                                         data->arg.new_lock_owner, ret);
4455         } else
4456                 data->cancelled = 1;
4457         rpc_put_task(task);
4458         dprintk("%s: done, ret = %d!\n", __func__, ret);
4459         return ret;
4460 }
4461
4462 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4463 {
4464         struct nfs_server *server = NFS_SERVER(state->inode);
4465         struct nfs4_exception exception = { };
4466         int err;
4467
4468         do {
4469                 /* Cache the lock if possible... */
4470                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4471                         return 0;
4472                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4473                 if (err != -NFS4ERR_DELAY)
4474                         break;
4475                 nfs4_handle_exception(server, err, &exception);
4476         } while (exception.retry);
4477         return err;
4478 }
4479
4480 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4481 {
4482         struct nfs_server *server = NFS_SERVER(state->inode);
4483         struct nfs4_exception exception = { };
4484         int err;
4485
4486         err = nfs4_set_lock_state(state, request);
4487         if (err != 0)
4488                 return err;
4489         do {
4490                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4491                         return 0;
4492                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4493                 switch (err) {
4494                 default:
4495                         goto out;
4496                 case -NFS4ERR_GRACE:
4497                 case -NFS4ERR_DELAY:
4498                         nfs4_handle_exception(server, err, &exception);
4499                         err = 0;
4500                 }
4501         } while (exception.retry);
4502 out:
4503         return err;
4504 }
4505
4506 #if defined(CONFIG_NFS_V4_1)
4507 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4508 {
4509         int status;
4510         struct nfs_server *server = NFS_SERVER(state->inode);
4511
4512         status = nfs41_test_stateid(server, &state->stateid);
4513         if (status == NFS_OK)
4514                 return 0;
4515         nfs41_free_stateid(server, &state->stateid);
4516         return nfs4_lock_expired(state, request);
4517 }
4518 #endif
4519
4520 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4521 {
4522         struct nfs_inode *nfsi = NFS_I(state->inode);
4523         unsigned char fl_flags = request->fl_flags;
4524         int status = -ENOLCK;
4525
4526         if ((fl_flags & FL_POSIX) &&
4527                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4528                 goto out;
4529         /* Is this a delegated open? */
4530         status = nfs4_set_lock_state(state, request);
4531         if (status != 0)
4532                 goto out;
4533         request->fl_flags |= FL_ACCESS;
4534         status = do_vfs_lock(request->fl_file, request);
4535         if (status < 0)
4536                 goto out;
4537         down_read(&nfsi->rwsem);
4538         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4539                 /* Yes: cache locks! */
4540                 /* ...but avoid races with delegation recall... */
4541                 request->fl_flags = fl_flags & ~FL_SLEEP;
4542                 status = do_vfs_lock(request->fl_file, request);
4543                 goto out_unlock;
4544         }
4545         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4546         if (status != 0)
4547                 goto out_unlock;
4548         /* Note: we always want to sleep here! */
4549         request->fl_flags = fl_flags | FL_SLEEP;
4550         if (do_vfs_lock(request->fl_file, request) < 0)
4551                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4552 out_unlock:
4553         up_read(&nfsi->rwsem);
4554 out:
4555         request->fl_flags = fl_flags;
4556         return status;
4557 }
4558
4559 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4560 {
4561         struct nfs4_exception exception = { };
4562         int err;
4563
4564         do {
4565                 err = _nfs4_proc_setlk(state, cmd, request);
4566                 if (err == -NFS4ERR_DENIED)
4567                         err = -EAGAIN;
4568                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4569                                 err, &exception);
4570         } while (exception.retry);
4571         return err;
4572 }
4573
4574 static int
4575 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4576 {
4577         struct nfs_open_context *ctx;
4578         struct nfs4_state *state;
4579         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4580         int status;
4581
4582         /* verify open state */
4583         ctx = nfs_file_open_context(filp);
4584         state = ctx->state;
4585
4586         if (request->fl_start < 0 || request->fl_end < 0)
4587                 return -EINVAL;
4588
4589         if (IS_GETLK(cmd)) {
4590                 if (state != NULL)
4591                         return nfs4_proc_getlk(state, F_GETLK, request);
4592                 return 0;
4593         }
4594
4595         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4596                 return -EINVAL;
4597
4598         if (request->fl_type == F_UNLCK) {
4599                 if (state != NULL)
4600                         return nfs4_proc_unlck(state, cmd, request);
4601                 return 0;
4602         }
4603
4604         if (state == NULL)
4605                 return -ENOLCK;
4606         do {
4607                 status = nfs4_proc_setlk(state, cmd, request);
4608                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4609                         break;
4610                 timeout = nfs4_set_lock_task_retry(timeout);
4611                 status = -ERESTARTSYS;
4612                 if (signalled())
4613                         break;
4614         } while(status < 0);
4615         return status;
4616 }
4617
4618 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4619 {
4620         struct nfs_server *server = NFS_SERVER(state->inode);
4621         struct nfs4_exception exception = { };
4622         int err;
4623
4624         err = nfs4_set_lock_state(state, fl);
4625         if (err != 0)
4626                 goto out;
4627         do {
4628                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4629                 switch (err) {
4630                         default:
4631                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4632                                                 __func__, err);
4633                         case 0:
4634                         case -ESTALE:
4635                                 goto out;
4636                         case -NFS4ERR_EXPIRED:
4637                                 nfs4_schedule_stateid_recovery(server, state);
4638                         case -NFS4ERR_STALE_CLIENTID:
4639                         case -NFS4ERR_STALE_STATEID:
4640                                 nfs4_schedule_lease_recovery(server->nfs_client);
4641                                 goto out;
4642                         case -NFS4ERR_BADSESSION:
4643                         case -NFS4ERR_BADSLOT:
4644                         case -NFS4ERR_BAD_HIGH_SLOT:
4645                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4646                         case -NFS4ERR_DEADSESSION:
4647                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4648                                 goto out;
4649                         case -ERESTARTSYS:
4650                                 /*
4651                                  * The show must go on: exit, but mark the
4652                                  * stateid as needing recovery.
4653                                  */
4654                         case -NFS4ERR_ADMIN_REVOKED:
4655                         case -NFS4ERR_BAD_STATEID:
4656                         case -NFS4ERR_OPENMODE:
4657                                 nfs4_schedule_stateid_recovery(server, state);
4658                                 err = 0;
4659                                 goto out;
4660                         case -EKEYEXPIRED:
4661                                 /*
4662                                  * User RPCSEC_GSS context has expired.
4663                                  * We cannot recover this stateid now, so
4664                                  * skip it and allow recovery thread to
4665                                  * proceed.
4666                                  */
4667                                 err = 0;
4668                                 goto out;
4669                         case -ENOMEM:
4670                         case -NFS4ERR_DENIED:
4671                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4672                                 err = 0;
4673                                 goto out;
4674                         case -NFS4ERR_DELAY:
4675                                 break;
4676                 }
4677                 err = nfs4_handle_exception(server, err, &exception);
4678         } while (exception.retry);
4679 out:
4680         return err;
4681 }
4682
4683 static void nfs4_release_lockowner_release(void *calldata)
4684 {
4685         kfree(calldata);
4686 }
4687
4688 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4689         .rpc_release = nfs4_release_lockowner_release,
4690 };
4691
4692 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4693 {
4694         struct nfs_server *server = lsp->ls_state->owner->so_server;
4695         struct nfs_release_lockowner_args *args;
4696         struct rpc_message msg = {
4697                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4698         };
4699
4700         if (server->nfs_client->cl_mvops->minor_version != 0)
4701                 return;
4702         args = kmalloc(sizeof(*args), GFP_NOFS);
4703         if (!args)
4704                 return;
4705         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4706         args->lock_owner.id = lsp->ls_seqid.owner_id;
4707         args->lock_owner.s_dev = server->s_dev;
4708         msg.rpc_argp = args;
4709         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4710 }
4711
4712 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4713
4714 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4715                                    const void *buf, size_t buflen,
4716                                    int flags, int type)
4717 {
4718         if (strcmp(key, "") != 0)
4719                 return -EINVAL;
4720
4721         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4722 }
4723
4724 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4725                                    void *buf, size_t buflen, int type)
4726 {
4727         if (strcmp(key, "") != 0)
4728                 return -EINVAL;
4729
4730         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4731 }
4732
4733 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4734                                        size_t list_len, const char *name,
4735                                        size_t name_len, int type)
4736 {
4737         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4738
4739         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4740                 return 0;
4741
4742         if (list && len <= list_len)
4743                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4744         return len;
4745 }
4746
4747 /*
4748  * nfs_fhget will use either the mounted_on_fileid or the fileid
4749  */
4750 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4751 {
4752         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4753                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4754               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4755               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4756                 return;
4757
4758         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4759                 NFS_ATTR_FATTR_NLINK;
4760         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4761         fattr->nlink = 2;
4762 }
4763
4764 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4765                 struct nfs4_fs_locations *fs_locations, struct page *page)
4766 {
4767         struct nfs_server *server = NFS_SERVER(dir);
4768         u32 bitmask[2] = {
4769                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4770         };
4771         struct nfs4_fs_locations_arg args = {
4772                 .dir_fh = NFS_FH(dir),
4773                 .name = name,
4774                 .page = page,
4775                 .bitmask = bitmask,
4776         };
4777         struct nfs4_fs_locations_res res = {
4778                 .fs_locations = fs_locations,
4779         };
4780         struct rpc_message msg = {
4781                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4782                 .rpc_argp = &args,
4783                 .rpc_resp = &res,
4784         };
4785         int status;
4786
4787         dprintk("%s: start\n", __func__);
4788
4789         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4790          * is not supported */
4791         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4792                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4793         else
4794                 bitmask[0] |= FATTR4_WORD0_FILEID;
4795
4796         nfs_fattr_init(&fs_locations->fattr);
4797         fs_locations->server = server;
4798         fs_locations->nlocations = 0;
4799         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4800         dprintk("%s: returned status = %d\n", __func__, status);
4801         return status;
4802 }
4803
4804 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4805 {
4806         int status;
4807         struct nfs4_secinfo_arg args = {
4808                 .dir_fh = NFS_FH(dir),
4809                 .name   = name,
4810         };
4811         struct nfs4_secinfo_res res = {
4812                 .flavors     = flavors,
4813         };
4814         struct rpc_message msg = {
4815                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4816                 .rpc_argp = &args,
4817                 .rpc_resp = &res,
4818         };
4819
4820         dprintk("NFS call  secinfo %s\n", name->name);
4821         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4822         dprintk("NFS reply  secinfo: %d\n", status);
4823         return status;
4824 }
4825
4826 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4827 {
4828         struct nfs4_exception exception = { };
4829         int err;
4830         do {
4831                 err = nfs4_handle_exception(NFS_SERVER(dir),
4832                                 _nfs4_proc_secinfo(dir, name, flavors),
4833                                 &exception);
4834         } while (exception.retry);
4835         return err;
4836 }
4837
4838 #ifdef CONFIG_NFS_V4_1
4839 /*
4840  * Check the exchange flags returned by the server for invalid flags, having
4841  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4842  * DS flags set.
4843  */
4844 static int nfs4_check_cl_exchange_flags(u32 flags)
4845 {
4846         if (flags & ~EXCHGID4_FLAG_MASK_R)
4847                 goto out_inval;
4848         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4849             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4850                 goto out_inval;
4851         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4852                 goto out_inval;
4853         return NFS_OK;
4854 out_inval:
4855         return -NFS4ERR_INVAL;
4856 }
4857
4858 static bool
4859 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4860 {
4861         if (a->server_scope_sz == b->server_scope_sz &&
4862             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4863                 return true;
4864
4865         return false;
4866 }
4867
4868 /*
4869  * nfs4_proc_exchange_id()
4870  *
4871  * Since the clientid has expired, all compounds using sessions
4872  * associated with the stale clientid will be returning
4873  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4874  * be in some phase of session reset.
4875  */
4876 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4877 {
4878         nfs4_verifier verifier;
4879         struct nfs41_exchange_id_args args = {
4880                 .client = clp,
4881                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4882         };
4883         struct nfs41_exchange_id_res res = {
4884                 .client = clp,
4885         };
4886         int status;
4887         struct rpc_message msg = {
4888                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4889                 .rpc_argp = &args,
4890                 .rpc_resp = &res,
4891                 .rpc_cred = cred,
4892         };
4893         __be32 *p;
4894
4895         dprintk("--> %s\n", __func__);
4896         BUG_ON(clp == NULL);
4897
4898         p = (u32 *)verifier.data;
4899         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4900         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4901         args.verifier = &verifier;
4902
4903         args.id_len = scnprintf(args.id, sizeof(args.id),
4904                                 "%s/%s.%s/%u",
4905                                 clp->cl_ipaddr,
4906                                 init_utsname()->nodename,
4907                                 init_utsname()->domainname,
4908                                 clp->cl_rpcclient->cl_auth->au_flavor);
4909
4910         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4911         if (unlikely(!res.server_scope))
4912                 return -ENOMEM;
4913
4914         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4915         if (!status)
4916                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4917
4918         if (!status) {
4919                 if (clp->server_scope &&
4920                     !nfs41_same_server_scope(clp->server_scope,
4921                                              res.server_scope)) {
4922                         dprintk("%s: server_scope mismatch detected\n",
4923                                 __func__);
4924                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4925                         kfree(clp->server_scope);
4926                         clp->server_scope = NULL;
4927                 }
4928
4929                 if (!clp->server_scope)
4930                         clp->server_scope = res.server_scope;
4931                 else
4932                         kfree(res.server_scope);
4933         }
4934
4935         dprintk("<-- %s status= %d\n", __func__, status);
4936         return status;
4937 }
4938
4939 struct nfs4_get_lease_time_data {
4940         struct nfs4_get_lease_time_args *args;
4941         struct nfs4_get_lease_time_res *res;
4942         struct nfs_client *clp;
4943 };
4944
4945 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4946                                         void *calldata)
4947 {
4948         int ret;
4949         struct nfs4_get_lease_time_data *data =
4950                         (struct nfs4_get_lease_time_data *)calldata;
4951
4952         dprintk("--> %s\n", __func__);
4953         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4954         /* just setup sequence, do not trigger session recovery
4955            since we're invoked within one */
4956         ret = nfs41_setup_sequence(data->clp->cl_session,
4957                                    &data->args->la_seq_args,
4958                                    &data->res->lr_seq_res, task);
4959
4960         BUG_ON(ret == -EAGAIN);
4961         rpc_call_start(task);
4962         dprintk("<-- %s\n", __func__);
4963 }
4964
4965 /*
4966  * Called from nfs4_state_manager thread for session setup, so don't recover
4967  * from sequence operation or clientid errors.
4968  */
4969 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4970 {
4971         struct nfs4_get_lease_time_data *data =
4972                         (struct nfs4_get_lease_time_data *)calldata;
4973
4974         dprintk("--> %s\n", __func__);
4975         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4976                 return;
4977         switch (task->tk_status) {
4978         case -NFS4ERR_DELAY:
4979         case -NFS4ERR_GRACE:
4980                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4981                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4982                 task->tk_status = 0;
4983                 /* fall through */
4984         case -NFS4ERR_RETRY_UNCACHED_REP:
4985                 rpc_restart_call_prepare(task);
4986                 return;
4987         }
4988         dprintk("<-- %s\n", __func__);
4989 }
4990
4991 struct rpc_call_ops nfs4_get_lease_time_ops = {
4992         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4993         .rpc_call_done = nfs4_get_lease_time_done,
4994 };
4995
4996 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4997 {
4998         struct rpc_task *task;
4999         struct nfs4_get_lease_time_args args;
5000         struct nfs4_get_lease_time_res res = {
5001                 .lr_fsinfo = fsinfo,
5002         };
5003         struct nfs4_get_lease_time_data data = {
5004                 .args = &args,
5005                 .res = &res,
5006                 .clp = clp,
5007         };
5008         struct rpc_message msg = {
5009                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5010                 .rpc_argp = &args,
5011                 .rpc_resp = &res,
5012         };
5013         struct rpc_task_setup task_setup = {
5014                 .rpc_client = clp->cl_rpcclient,
5015                 .rpc_message = &msg,
5016                 .callback_ops = &nfs4_get_lease_time_ops,
5017                 .callback_data = &data,
5018                 .flags = RPC_TASK_TIMEOUT,
5019         };
5020         int status;
5021
5022         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5023         dprintk("--> %s\n", __func__);
5024         task = rpc_run_task(&task_setup);
5025
5026         if (IS_ERR(task))
5027                 status = PTR_ERR(task);
5028         else {
5029                 status = task->tk_status;
5030                 rpc_put_task(task);
5031         }
5032         dprintk("<-- %s return %d\n", __func__, status);
5033
5034         return status;
5035 }
5036
5037 /*
5038  * Reset a slot table
5039  */
5040 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5041                                  int ivalue)
5042 {
5043         struct nfs4_slot *new = NULL;
5044         int i;
5045         int ret = 0;
5046
5047         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5048                 max_reqs, tbl->max_slots);
5049
5050         /* Does the newly negotiated max_reqs match the existing slot table? */
5051         if (max_reqs != tbl->max_slots) {
5052                 ret = -ENOMEM;
5053                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5054                               GFP_NOFS);
5055                 if (!new)
5056                         goto out;
5057                 ret = 0;
5058                 kfree(tbl->slots);
5059         }
5060         spin_lock(&tbl->slot_tbl_lock);
5061         if (new) {
5062                 tbl->slots = new;
5063                 tbl->max_slots = max_reqs;
5064         }
5065         for (i = 0; i < tbl->max_slots; ++i)
5066                 tbl->slots[i].seq_nr = ivalue;
5067         spin_unlock(&tbl->slot_tbl_lock);
5068         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5069                 tbl, tbl->slots, tbl->max_slots);
5070 out:
5071         dprintk("<-- %s: return %d\n", __func__, ret);
5072         return ret;
5073 }
5074
5075 /* Destroy the slot table */
5076 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5077 {
5078         if (session->fc_slot_table.slots != NULL) {
5079                 kfree(session->fc_slot_table.slots);
5080                 session->fc_slot_table.slots = NULL;
5081         }
5082         if (session->bc_slot_table.slots != NULL) {
5083                 kfree(session->bc_slot_table.slots);
5084                 session->bc_slot_table.slots = NULL;
5085         }
5086         return;
5087 }
5088
5089 /*
5090  * Initialize slot table
5091  */
5092 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5093                 int max_slots, int ivalue)
5094 {
5095         struct nfs4_slot *slot;
5096         int ret = -ENOMEM;
5097
5098         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5099
5100         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5101
5102         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5103         if (!slot)
5104                 goto out;
5105         ret = 0;
5106
5107         spin_lock(&tbl->slot_tbl_lock);
5108         tbl->max_slots = max_slots;
5109         tbl->slots = slot;
5110         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5111         spin_unlock(&tbl->slot_tbl_lock);
5112         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5113                 tbl, tbl->slots, tbl->max_slots);
5114 out:
5115         dprintk("<-- %s: return %d\n", __func__, ret);
5116         return ret;
5117 }
5118
5119 /*
5120  * Initialize or reset the forechannel and backchannel tables
5121  */
5122 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5123 {
5124         struct nfs4_slot_table *tbl;
5125         int status;
5126
5127         dprintk("--> %s\n", __func__);
5128         /* Fore channel */
5129         tbl = &ses->fc_slot_table;
5130         if (tbl->slots == NULL) {
5131                 status = nfs4_init_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5132                 if (status) /* -ENOMEM */
5133                         return status;
5134         } else {
5135                 status = nfs4_reset_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5136                 if (status)
5137                         return status;
5138         }
5139         /* Back channel */
5140         tbl = &ses->bc_slot_table;
5141         if (tbl->slots == NULL) {
5142                 status = nfs4_init_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5143                 if (status)
5144                         /* Fore and back channel share a connection so get
5145                          * both slot tables or neither */
5146                         nfs4_destroy_slot_tables(ses);
5147         } else
5148                 status = nfs4_reset_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5149         return status;
5150 }
5151
5152 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5153 {
5154         struct nfs4_session *session;
5155         struct nfs4_slot_table *tbl;
5156
5157         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5158         if (!session)
5159                 return NULL;
5160
5161         tbl = &session->fc_slot_table;
5162         tbl->highest_used_slotid = -1;
5163         spin_lock_init(&tbl->slot_tbl_lock);
5164         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5165         init_completion(&tbl->complete);
5166
5167         tbl = &session->bc_slot_table;
5168         tbl->highest_used_slotid = -1;
5169         spin_lock_init(&tbl->slot_tbl_lock);
5170         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5171         init_completion(&tbl->complete);
5172
5173         session->session_state = 1<<NFS4_SESSION_INITING;
5174
5175         session->clp = clp;
5176         return session;
5177 }
5178
5179 void nfs4_destroy_session(struct nfs4_session *session)
5180 {
5181         nfs4_proc_destroy_session(session);
5182         dprintk("%s Destroy backchannel for xprt %p\n",
5183                 __func__, session->clp->cl_rpcclient->cl_xprt);
5184         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5185                                 NFS41_BC_MIN_CALLBACKS);
5186         nfs4_destroy_slot_tables(session);
5187         kfree(session);
5188 }
5189
5190 /*
5191  * Initialize the values to be used by the client in CREATE_SESSION
5192  * If nfs4_init_session set the fore channel request and response sizes,
5193  * use them.
5194  *
5195  * Set the back channel max_resp_sz_cached to zero to force the client to
5196  * always set csa_cachethis to FALSE because the current implementation
5197  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5198  */
5199 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5200 {
5201         struct nfs4_session *session = args->client->cl_session;
5202         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5203                      mxresp_sz = session->fc_attrs.max_resp_sz;
5204
5205         if (mxrqst_sz == 0)
5206                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5207         if (mxresp_sz == 0)
5208                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5209         /* Fore channel attributes */
5210         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5211         args->fc_attrs.max_resp_sz = mxresp_sz;
5212         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5213         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5214
5215         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5216                 "max_ops=%u max_reqs=%u\n",
5217                 __func__,
5218                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5219                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5220
5221         /* Back channel attributes */
5222         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5223         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5224         args->bc_attrs.max_resp_sz_cached = 0;
5225         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5226         args->bc_attrs.max_reqs = 1;
5227
5228         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5229                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5230                 __func__,
5231                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5232                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5233                 args->bc_attrs.max_reqs);
5234 }
5235
5236 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5237 {
5238         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5239         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5240
5241         if (rcvd->max_resp_sz > sent->max_resp_sz)
5242                 return -EINVAL;
5243         /*
5244          * Our requested max_ops is the minimum we need; we're not
5245          * prepared to break up compounds into smaller pieces than that.
5246          * So, no point even trying to continue if the server won't
5247          * cooperate:
5248          */
5249         if (rcvd->max_ops < sent->max_ops)
5250                 return -EINVAL;
5251         if (rcvd->max_reqs == 0)
5252                 return -EINVAL;
5253         return 0;
5254 }
5255
5256 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5257 {
5258         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5259         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5260
5261         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5262                 return -EINVAL;
5263         if (rcvd->max_resp_sz < sent->max_resp_sz)
5264                 return -EINVAL;
5265         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5266                 return -EINVAL;
5267         /* These would render the backchannel useless: */
5268         if (rcvd->max_ops  == 0)
5269                 return -EINVAL;
5270         if (rcvd->max_reqs == 0)
5271                 return -EINVAL;
5272         return 0;
5273 }
5274
5275 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5276                                      struct nfs4_session *session)
5277 {
5278         int ret;
5279
5280         ret = nfs4_verify_fore_channel_attrs(args, session);
5281         if (ret)
5282                 return ret;
5283         return nfs4_verify_back_channel_attrs(args, session);
5284 }
5285
5286 static int _nfs4_proc_create_session(struct nfs_client *clp)
5287 {
5288         struct nfs4_session *session = clp->cl_session;
5289         struct nfs41_create_session_args args = {
5290                 .client = clp,
5291                 .cb_program = NFS4_CALLBACK,
5292         };
5293         struct nfs41_create_session_res res = {
5294                 .client = clp,
5295         };
5296         struct rpc_message msg = {
5297                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5298                 .rpc_argp = &args,
5299                 .rpc_resp = &res,
5300         };
5301         int status;
5302
5303         nfs4_init_channel_attrs(&args);
5304         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5305
5306         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5307
5308         if (!status)
5309                 /* Verify the session's negotiated channel_attrs values */
5310                 status = nfs4_verify_channel_attrs(&args, session);
5311         if (!status) {
5312                 /* Increment the clientid slot sequence id */
5313                 clp->cl_seqid++;
5314         }
5315
5316         return status;
5317 }
5318
5319 /*
5320  * Issues a CREATE_SESSION operation to the server.
5321  * It is the responsibility of the caller to verify the session is
5322  * expired before calling this routine.
5323  */
5324 int nfs4_proc_create_session(struct nfs_client *clp)
5325 {
5326         int status;
5327         unsigned *ptr;
5328         struct nfs4_session *session = clp->cl_session;
5329
5330         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5331
5332         status = _nfs4_proc_create_session(clp);
5333         if (status)
5334                 goto out;
5335
5336         /* Init or reset the session slot tables */
5337         status = nfs4_setup_session_slot_tables(session);
5338         dprintk("slot table setup returned %d\n", status);
5339         if (status)
5340                 goto out;
5341
5342         ptr = (unsigned *)&session->sess_id.data[0];
5343         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5344                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5345 out:
5346         dprintk("<-- %s\n", __func__);
5347         return status;
5348 }
5349
5350 /*
5351  * Issue the over-the-wire RPC DESTROY_SESSION.
5352  * The caller must serialize access to this routine.
5353  */
5354 int nfs4_proc_destroy_session(struct nfs4_session *session)
5355 {
5356         int status = 0;
5357         struct rpc_message msg;
5358
5359         dprintk("--> nfs4_proc_destroy_session\n");
5360
5361         /* session is still being setup */
5362         if (session->clp->cl_cons_state != NFS_CS_READY)
5363                 return status;
5364
5365         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5366         msg.rpc_argp = session;
5367         msg.rpc_resp = NULL;
5368         msg.rpc_cred = NULL;
5369         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5370
5371         if (status)
5372                 printk(KERN_WARNING
5373                         "Got error %d from the server on DESTROY_SESSION. "
5374                         "Session has been destroyed regardless...\n", status);
5375
5376         dprintk("<-- nfs4_proc_destroy_session\n");
5377         return status;
5378 }
5379
5380 int nfs4_init_session(struct nfs_server *server)
5381 {
5382         struct nfs_client *clp = server->nfs_client;
5383         struct nfs4_session *session;
5384         unsigned int rsize, wsize;
5385         int ret;
5386
5387         if (!nfs4_has_session(clp))
5388                 return 0;
5389
5390         session = clp->cl_session;
5391         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5392                 return 0;
5393
5394         rsize = server->rsize;
5395         if (rsize == 0)
5396                 rsize = NFS_MAX_FILE_IO_SIZE;
5397         wsize = server->wsize;
5398         if (wsize == 0)
5399                 wsize = NFS_MAX_FILE_IO_SIZE;
5400
5401         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5402         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5403
5404         ret = nfs4_recover_expired_lease(server);
5405         if (!ret)
5406                 ret = nfs4_check_client_ready(clp);
5407         return ret;
5408 }
5409
5410 int nfs4_init_ds_session(struct nfs_client *clp)
5411 {
5412         struct nfs4_session *session = clp->cl_session;
5413         int ret;
5414
5415         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5416                 return 0;
5417
5418         ret = nfs4_client_recover_expired_lease(clp);
5419         if (!ret)
5420                 /* Test for the DS role */
5421                 if (!is_ds_client(clp))
5422                         ret = -ENODEV;
5423         if (!ret)
5424                 ret = nfs4_check_client_ready(clp);
5425         return ret;
5426
5427 }
5428 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5429
5430
5431 /*
5432  * Renew the cl_session lease.
5433  */
5434 struct nfs4_sequence_data {
5435         struct nfs_client *clp;
5436         struct nfs4_sequence_args args;
5437         struct nfs4_sequence_res res;
5438 };
5439
5440 static void nfs41_sequence_release(void *data)
5441 {
5442         struct nfs4_sequence_data *calldata = data;
5443         struct nfs_client *clp = calldata->clp;
5444
5445         if (atomic_read(&clp->cl_count) > 1)
5446                 nfs4_schedule_state_renewal(clp);
5447         nfs_put_client(clp);
5448         kfree(calldata);
5449 }
5450
5451 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5452 {
5453         switch(task->tk_status) {
5454         case -NFS4ERR_DELAY:
5455                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5456                 return -EAGAIN;
5457         default:
5458                 nfs4_schedule_lease_recovery(clp);
5459         }
5460         return 0;
5461 }
5462
5463 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5464 {
5465         struct nfs4_sequence_data *calldata = data;
5466         struct nfs_client *clp = calldata->clp;
5467
5468         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5469                 return;
5470
5471         if (task->tk_status < 0) {
5472                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5473                 if (atomic_read(&clp->cl_count) == 1)
5474                         goto out;
5475
5476                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5477                         rpc_restart_call_prepare(task);
5478                         return;
5479                 }
5480         }
5481         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5482 out:
5483         dprintk("<-- %s\n", __func__);
5484 }
5485
5486 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5487 {
5488         struct nfs4_sequence_data *calldata = data;
5489         struct nfs_client *clp = calldata->clp;
5490         struct nfs4_sequence_args *args;
5491         struct nfs4_sequence_res *res;
5492
5493         args = task->tk_msg.rpc_argp;
5494         res = task->tk_msg.rpc_resp;
5495
5496         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5497                 return;
5498         rpc_call_start(task);
5499 }
5500
5501 static const struct rpc_call_ops nfs41_sequence_ops = {
5502         .rpc_call_done = nfs41_sequence_call_done,
5503         .rpc_call_prepare = nfs41_sequence_prepare,
5504         .rpc_release = nfs41_sequence_release,
5505 };
5506
5507 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5508 {
5509         struct nfs4_sequence_data *calldata;
5510         struct rpc_message msg = {
5511                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5512                 .rpc_cred = cred,
5513         };
5514         struct rpc_task_setup task_setup_data = {
5515                 .rpc_client = clp->cl_rpcclient,
5516                 .rpc_message = &msg,
5517                 .callback_ops = &nfs41_sequence_ops,
5518                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5519         };
5520
5521         if (!atomic_inc_not_zero(&clp->cl_count))
5522                 return ERR_PTR(-EIO);
5523         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5524         if (calldata == NULL) {
5525                 nfs_put_client(clp);
5526                 return ERR_PTR(-ENOMEM);
5527         }
5528         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5529         msg.rpc_argp = &calldata->args;
5530         msg.rpc_resp = &calldata->res;
5531         calldata->clp = clp;
5532         task_setup_data.callback_data = calldata;
5533
5534         return rpc_run_task(&task_setup_data);
5535 }
5536
5537 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5538 {
5539         struct rpc_task *task;
5540         int ret = 0;
5541
5542         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5543                 return 0;
5544         task = _nfs41_proc_sequence(clp, cred);
5545         if (IS_ERR(task))
5546                 ret = PTR_ERR(task);
5547         else
5548                 rpc_put_task_async(task);
5549         dprintk("<-- %s status=%d\n", __func__, ret);
5550         return ret;
5551 }
5552
5553 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5554 {
5555         struct rpc_task *task;
5556         int ret;
5557
5558         task = _nfs41_proc_sequence(clp, cred);
5559         if (IS_ERR(task)) {
5560                 ret = PTR_ERR(task);
5561                 goto out;
5562         }
5563         ret = rpc_wait_for_completion_task(task);
5564         if (!ret) {
5565                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5566
5567                 if (task->tk_status == 0)
5568                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5569                 ret = task->tk_status;
5570         }
5571         rpc_put_task(task);
5572 out:
5573         dprintk("<-- %s status=%d\n", __func__, ret);
5574         return ret;
5575 }
5576
5577 struct nfs4_reclaim_complete_data {
5578         struct nfs_client *clp;
5579         struct nfs41_reclaim_complete_args arg;
5580         struct nfs41_reclaim_complete_res res;
5581 };
5582
5583 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5584 {
5585         struct nfs4_reclaim_complete_data *calldata = data;
5586
5587         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5588         if (nfs41_setup_sequence(calldata->clp->cl_session,
5589                                 &calldata->arg.seq_args,
5590                                 &calldata->res.seq_res, task))
5591                 return;
5592
5593         rpc_call_start(task);
5594 }
5595
5596 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5597 {
5598         switch(task->tk_status) {
5599         case 0:
5600         case -NFS4ERR_COMPLETE_ALREADY:
5601         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5602                 break;
5603         case -NFS4ERR_DELAY:
5604                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5605                 /* fall through */
5606         case -NFS4ERR_RETRY_UNCACHED_REP:
5607                 return -EAGAIN;
5608         default:
5609                 nfs4_schedule_lease_recovery(clp);
5610         }
5611         return 0;
5612 }
5613
5614 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5615 {
5616         struct nfs4_reclaim_complete_data *calldata = data;
5617         struct nfs_client *clp = calldata->clp;
5618         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5619
5620         dprintk("--> %s\n", __func__);
5621         if (!nfs41_sequence_done(task, res))
5622                 return;
5623
5624         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5625                 rpc_restart_call_prepare(task);
5626                 return;
5627         }
5628         dprintk("<-- %s\n", __func__);
5629 }
5630
5631 static void nfs4_free_reclaim_complete_data(void *data)
5632 {
5633         struct nfs4_reclaim_complete_data *calldata = data;
5634
5635         kfree(calldata);
5636 }
5637
5638 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5639         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5640         .rpc_call_done = nfs4_reclaim_complete_done,
5641         .rpc_release = nfs4_free_reclaim_complete_data,
5642 };
5643
5644 /*
5645  * Issue a global reclaim complete.
5646  */
5647 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5648 {
5649         struct nfs4_reclaim_complete_data *calldata;
5650         struct rpc_task *task;
5651         struct rpc_message msg = {
5652                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5653         };
5654         struct rpc_task_setup task_setup_data = {
5655                 .rpc_client = clp->cl_rpcclient,
5656                 .rpc_message = &msg,
5657                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5658                 .flags = RPC_TASK_ASYNC,
5659         };
5660         int status = -ENOMEM;
5661
5662         dprintk("--> %s\n", __func__);
5663         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5664         if (calldata == NULL)
5665                 goto out;
5666         calldata->clp = clp;
5667         calldata->arg.one_fs = 0;
5668
5669         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5670         msg.rpc_argp = &calldata->arg;
5671         msg.rpc_resp = &calldata->res;
5672         task_setup_data.callback_data = calldata;
5673         task = rpc_run_task(&task_setup_data);
5674         if (IS_ERR(task)) {
5675                 status = PTR_ERR(task);
5676                 goto out;
5677         }
5678         status = nfs4_wait_for_completion_rpc_task(task);
5679         if (status == 0)
5680                 status = task->tk_status;
5681         rpc_put_task(task);
5682         return 0;
5683 out:
5684         dprintk("<-- %s status=%d\n", __func__, status);
5685         return status;
5686 }
5687
5688 static void
5689 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5690 {
5691         struct nfs4_layoutget *lgp = calldata;
5692         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5693
5694         dprintk("--> %s\n", __func__);
5695         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5696          * right now covering the LAYOUTGET we are about to send.
5697          * However, that is not so catastrophic, and there seems
5698          * to be no way to prevent it completely.
5699          */
5700         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5701                                 &lgp->res.seq_res, task))
5702                 return;
5703         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5704                                           NFS_I(lgp->args.inode)->layout,
5705                                           lgp->args.ctx->state)) {
5706                 rpc_exit(task, NFS4_OK);
5707                 return;
5708         }
5709         rpc_call_start(task);
5710 }
5711
5712 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5713 {
5714         struct nfs4_layoutget *lgp = calldata;
5715         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5716
5717         dprintk("--> %s\n", __func__);
5718
5719         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5720                 return;
5721
5722         switch (task->tk_status) {
5723         case 0:
5724                 break;
5725         case -NFS4ERR_LAYOUTTRYLATER:
5726         case -NFS4ERR_RECALLCONFLICT:
5727                 task->tk_status = -NFS4ERR_DELAY;
5728                 /* Fall through */
5729         default:
5730                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5731                         rpc_restart_call_prepare(task);
5732                         return;
5733                 }
5734         }
5735         dprintk("<-- %s\n", __func__);
5736 }
5737
5738 static void nfs4_layoutget_release(void *calldata)
5739 {
5740         struct nfs4_layoutget *lgp = calldata;
5741
5742         dprintk("--> %s\n", __func__);
5743         put_nfs_open_context(lgp->args.ctx);
5744         kfree(calldata);
5745         dprintk("<-- %s\n", __func__);
5746 }
5747
5748 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5749         .rpc_call_prepare = nfs4_layoutget_prepare,
5750         .rpc_call_done = nfs4_layoutget_done,
5751         .rpc_release = nfs4_layoutget_release,
5752 };
5753
5754 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5755 {
5756         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5757         struct rpc_task *task;
5758         struct rpc_message msg = {
5759                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5760                 .rpc_argp = &lgp->args,
5761                 .rpc_resp = &lgp->res,
5762         };
5763         struct rpc_task_setup task_setup_data = {
5764                 .rpc_client = server->client,
5765                 .rpc_message = &msg,
5766                 .callback_ops = &nfs4_layoutget_call_ops,
5767                 .callback_data = lgp,
5768                 .flags = RPC_TASK_ASYNC,
5769         };
5770         int status = 0;
5771
5772         dprintk("--> %s\n", __func__);
5773
5774         lgp->res.layoutp = &lgp->args.layout;
5775         lgp->res.seq_res.sr_slot = NULL;
5776         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
5777         task = rpc_run_task(&task_setup_data);
5778         if (IS_ERR(task))
5779                 return PTR_ERR(task);
5780         status = nfs4_wait_for_completion_rpc_task(task);
5781         if (status == 0)
5782                 status = task->tk_status;
5783         if (status == 0)
5784                 status = pnfs_layout_process(lgp);
5785         rpc_put_task(task);
5786         dprintk("<-- %s status=%d\n", __func__, status);
5787         return status;
5788 }
5789
5790 static void
5791 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5792 {
5793         struct nfs4_layoutreturn *lrp = calldata;
5794
5795         dprintk("--> %s\n", __func__);
5796         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5797                                 &lrp->res.seq_res, task))
5798                 return;
5799         rpc_call_start(task);
5800 }
5801
5802 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5803 {
5804         struct nfs4_layoutreturn *lrp = calldata;
5805         struct nfs_server *server;
5806         struct pnfs_layout_hdr *lo = lrp->args.layout;
5807
5808         dprintk("--> %s\n", __func__);
5809
5810         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5811                 return;
5812
5813         server = NFS_SERVER(lrp->args.inode);
5814         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5815                 rpc_restart_call_prepare(task);
5816                 return;
5817         }
5818         spin_lock(&lo->plh_inode->i_lock);
5819         if (task->tk_status == 0) {
5820                 if (lrp->res.lrs_present) {
5821                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5822                 } else
5823                         BUG_ON(!list_empty(&lo->plh_segs));
5824         }
5825         lo->plh_block_lgets--;
5826         spin_unlock(&lo->plh_inode->i_lock);
5827         dprintk("<-- %s\n", __func__);
5828 }
5829
5830 static void nfs4_layoutreturn_release(void *calldata)
5831 {
5832         struct nfs4_layoutreturn *lrp = calldata;
5833
5834         dprintk("--> %s\n", __func__);
5835         put_layout_hdr(lrp->args.layout);
5836         kfree(calldata);
5837         dprintk("<-- %s\n", __func__);
5838 }
5839
5840 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5841         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5842         .rpc_call_done = nfs4_layoutreturn_done,
5843         .rpc_release = nfs4_layoutreturn_release,
5844 };
5845
5846 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5847 {
5848         struct rpc_task *task;
5849         struct rpc_message msg = {
5850                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5851                 .rpc_argp = &lrp->args,
5852                 .rpc_resp = &lrp->res,
5853         };
5854         struct rpc_task_setup task_setup_data = {
5855                 .rpc_client = lrp->clp->cl_rpcclient,
5856                 .rpc_message = &msg,
5857                 .callback_ops = &nfs4_layoutreturn_call_ops,
5858                 .callback_data = lrp,
5859         };
5860         int status;
5861
5862         dprintk("--> %s\n", __func__);
5863         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
5864         task = rpc_run_task(&task_setup_data);
5865         if (IS_ERR(task))
5866                 return PTR_ERR(task);
5867         status = task->tk_status;
5868         dprintk("<-- %s status=%d\n", __func__, status);
5869         rpc_put_task(task);
5870         return status;
5871 }
5872
5873 /*
5874  * Retrieve the list of Data Server devices from the MDS.
5875  */
5876 static int _nfs4_getdevicelist(struct nfs_server *server,
5877                                     const struct nfs_fh *fh,
5878                                     struct pnfs_devicelist *devlist)
5879 {
5880         struct nfs4_getdevicelist_args args = {
5881                 .fh = fh,
5882                 .layoutclass = server->pnfs_curr_ld->id,
5883         };
5884         struct nfs4_getdevicelist_res res = {
5885                 .devlist = devlist,
5886         };
5887         struct rpc_message msg = {
5888                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5889                 .rpc_argp = &args,
5890                 .rpc_resp = &res,
5891         };
5892         int status;
5893
5894         dprintk("--> %s\n", __func__);
5895         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5896                                 &res.seq_res, 0);
5897         dprintk("<-- %s status=%d\n", __func__, status);
5898         return status;
5899 }
5900
5901 int nfs4_proc_getdevicelist(struct nfs_server *server,
5902                             const struct nfs_fh *fh,
5903                             struct pnfs_devicelist *devlist)
5904 {
5905         struct nfs4_exception exception = { };
5906         int err;
5907
5908         do {
5909                 err = nfs4_handle_exception(server,
5910                                 _nfs4_getdevicelist(server, fh, devlist),
5911                                 &exception);
5912         } while (exception.retry);
5913
5914         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5915                 err, devlist->num_devs);
5916
5917         return err;
5918 }
5919 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5920
5921 static int
5922 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5923 {
5924         struct nfs4_getdeviceinfo_args args = {
5925                 .pdev = pdev,
5926         };
5927         struct nfs4_getdeviceinfo_res res = {
5928                 .pdev = pdev,
5929         };
5930         struct rpc_message msg = {
5931                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5932                 .rpc_argp = &args,
5933                 .rpc_resp = &res,
5934         };
5935         int status;
5936
5937         dprintk("--> %s\n", __func__);
5938         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5939         dprintk("<-- %s status=%d\n", __func__, status);
5940
5941         return status;
5942 }
5943
5944 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5945 {
5946         struct nfs4_exception exception = { };
5947         int err;
5948
5949         do {
5950                 err = nfs4_handle_exception(server,
5951                                         _nfs4_proc_getdeviceinfo(server, pdev),
5952                                         &exception);
5953         } while (exception.retry);
5954         return err;
5955 }
5956 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5957
5958 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5959 {
5960         struct nfs4_layoutcommit_data *data = calldata;
5961         struct nfs_server *server = NFS_SERVER(data->args.inode);
5962
5963         if (nfs4_setup_sequence(server, &data->args.seq_args,
5964                                 &data->res.seq_res, task))
5965                 return;
5966         rpc_call_start(task);
5967 }
5968
5969 static void
5970 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5971 {
5972         struct nfs4_layoutcommit_data *data = calldata;
5973         struct nfs_server *server = NFS_SERVER(data->args.inode);
5974
5975         if (!nfs4_sequence_done(task, &data->res.seq_res))
5976                 return;
5977
5978         switch (task->tk_status) { /* Just ignore these failures */
5979         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5980         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5981         case NFS4ERR_BADLAYOUT:     /* no layout */
5982         case NFS4ERR_GRACE:         /* loca_recalim always false */
5983                 task->tk_status = 0;
5984         }
5985
5986         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5987                 rpc_restart_call_prepare(task);
5988                 return;
5989         }
5990
5991         if (task->tk_status == 0)
5992                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5993                                                    data->res.fattr);
5994 }
5995
5996 static void nfs4_layoutcommit_release(void *calldata)
5997 {
5998         struct nfs4_layoutcommit_data *data = calldata;
5999         struct pnfs_layout_segment *lseg, *tmp;
6000         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6001
6002         pnfs_cleanup_layoutcommit(data);
6003         /* Matched by references in pnfs_set_layoutcommit */
6004         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6005                 list_del_init(&lseg->pls_lc_list);
6006                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6007                                        &lseg->pls_flags))
6008                         put_lseg(lseg);
6009         }
6010
6011         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6012         smp_mb__after_clear_bit();
6013         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6014
6015         put_rpccred(data->cred);
6016         kfree(data);
6017 }
6018
6019 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6020         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6021         .rpc_call_done = nfs4_layoutcommit_done,
6022         .rpc_release = nfs4_layoutcommit_release,
6023 };
6024
6025 int
6026 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6027 {
6028         struct rpc_message msg = {
6029                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6030                 .rpc_argp = &data->args,
6031                 .rpc_resp = &data->res,
6032                 .rpc_cred = data->cred,
6033         };
6034         struct rpc_task_setup task_setup_data = {
6035                 .task = &data->task,
6036                 .rpc_client = NFS_CLIENT(data->args.inode),
6037                 .rpc_message = &msg,
6038                 .callback_ops = &nfs4_layoutcommit_ops,
6039                 .callback_data = data,
6040                 .flags = RPC_TASK_ASYNC,
6041         };
6042         struct rpc_task *task;
6043         int status = 0;
6044
6045         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6046                 "lbw: %llu inode %lu\n",
6047                 data->task.tk_pid, sync,
6048                 data->args.lastbytewritten,
6049                 data->args.inode->i_ino);
6050
6051         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6052         task = rpc_run_task(&task_setup_data);
6053         if (IS_ERR(task))
6054                 return PTR_ERR(task);
6055         if (sync == false)
6056                 goto out;
6057         status = nfs4_wait_for_completion_rpc_task(task);
6058         if (status != 0)
6059                 goto out;
6060         status = task->tk_status;
6061 out:
6062         dprintk("%s: status %d\n", __func__, status);
6063         rpc_put_task(task);
6064         return status;
6065 }
6066
6067 static int
6068 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6069                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6070 {
6071         struct nfs41_secinfo_no_name_args args = {
6072                 .style = SECINFO_STYLE_CURRENT_FH,
6073         };
6074         struct nfs4_secinfo_res res = {
6075                 .flavors = flavors,
6076         };
6077         struct rpc_message msg = {
6078                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6079                 .rpc_argp = &args,
6080                 .rpc_resp = &res,
6081         };
6082         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6083 }
6084
6085 static int
6086 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6087                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6088 {
6089         struct nfs4_exception exception = { };
6090         int err;
6091         do {
6092                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6093                 switch (err) {
6094                 case 0:
6095                 case -NFS4ERR_WRONGSEC:
6096                 case -NFS4ERR_NOTSUPP:
6097                         break;
6098                 default:
6099                         err = nfs4_handle_exception(server, err, &exception);
6100                 }
6101         } while (exception.retry);
6102         return err;
6103 }
6104
6105 static int
6106 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6107                     struct nfs_fsinfo *info)
6108 {
6109         int err;
6110         struct page *page;
6111         rpc_authflavor_t flavor;
6112         struct nfs4_secinfo_flavors *flavors;
6113
6114         page = alloc_page(GFP_KERNEL);
6115         if (!page) {
6116                 err = -ENOMEM;
6117                 goto out;
6118         }
6119
6120         flavors = page_address(page);
6121         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6122
6123         /*
6124          * Fall back on "guess and check" method if
6125          * the server doesn't support SECINFO_NO_NAME
6126          */
6127         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6128                 err = nfs4_find_root_sec(server, fhandle, info);
6129                 goto out_freepage;
6130         }
6131         if (err)
6132                 goto out_freepage;
6133
6134         flavor = nfs_find_best_sec(flavors);
6135         if (err == 0)
6136                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6137
6138 out_freepage:
6139         put_page(page);
6140         if (err == -EACCES)
6141                 return -EPERM;
6142 out:
6143         return err;
6144 }
6145
6146 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6147 {
6148         int status;
6149         struct nfs41_test_stateid_args args = {
6150                 .stateid = stateid,
6151         };
6152         struct nfs41_test_stateid_res res;
6153         struct rpc_message msg = {
6154                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6155                 .rpc_argp = &args,
6156                 .rpc_resp = &res,
6157         };
6158
6159         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6160         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6161
6162         if (status == NFS_OK)
6163                 return res.status;
6164         return status;
6165 }
6166
6167 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6168 {
6169         struct nfs4_exception exception = { };
6170         int err;
6171         do {
6172                 err = nfs4_handle_exception(server,
6173                                 _nfs41_test_stateid(server, stateid),
6174                                 &exception);
6175         } while (exception.retry);
6176         return err;
6177 }
6178
6179 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6180 {
6181         struct nfs41_free_stateid_args args = {
6182                 .stateid = stateid,
6183         };
6184         struct nfs41_free_stateid_res res;
6185         struct rpc_message msg = {
6186                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6187                 .rpc_argp = &args,
6188                 .rpc_resp = &res,
6189         };
6190
6191         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6192         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6193 }
6194
6195 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6196 {
6197         struct nfs4_exception exception = { };
6198         int err;
6199         do {
6200                 err = nfs4_handle_exception(server,
6201                                 _nfs4_free_stateid(server, stateid),
6202                                 &exception);
6203         } while (exception.retry);
6204         return err;
6205 }
6206 #endif /* CONFIG_NFS_V4_1 */
6207
6208 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6209         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6210         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6211         .recover_open   = nfs4_open_reclaim,
6212         .recover_lock   = nfs4_lock_reclaim,
6213         .establish_clid = nfs4_init_clientid,
6214         .get_clid_cred  = nfs4_get_setclientid_cred,
6215 };
6216
6217 #if defined(CONFIG_NFS_V4_1)
6218 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6219         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6220         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6221         .recover_open   = nfs4_open_reclaim,
6222         .recover_lock   = nfs4_lock_reclaim,
6223         .establish_clid = nfs41_init_clientid,
6224         .get_clid_cred  = nfs4_get_exchange_id_cred,
6225         .reclaim_complete = nfs41_proc_reclaim_complete,
6226 };
6227 #endif /* CONFIG_NFS_V4_1 */
6228
6229 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6230         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6231         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6232         .recover_open   = nfs4_open_expired,
6233         .recover_lock   = nfs4_lock_expired,
6234         .establish_clid = nfs4_init_clientid,
6235         .get_clid_cred  = nfs4_get_setclientid_cred,
6236 };
6237
6238 #if defined(CONFIG_NFS_V4_1)
6239 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6240         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6241         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6242         .recover_open   = nfs41_open_expired,
6243         .recover_lock   = nfs41_lock_expired,
6244         .establish_clid = nfs41_init_clientid,
6245         .get_clid_cred  = nfs4_get_exchange_id_cred,
6246 };
6247 #endif /* CONFIG_NFS_V4_1 */
6248
6249 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6250         .sched_state_renewal = nfs4_proc_async_renew,
6251         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6252         .renew_lease = nfs4_proc_renew,
6253 };
6254
6255 #if defined(CONFIG_NFS_V4_1)
6256 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6257         .sched_state_renewal = nfs41_proc_async_sequence,
6258         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6259         .renew_lease = nfs4_proc_sequence,
6260 };
6261 #endif
6262
6263 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6264         .minor_version = 0,
6265         .call_sync = _nfs4_call_sync,
6266         .validate_stateid = nfs4_validate_delegation_stateid,
6267         .find_root_sec = nfs4_find_root_sec,
6268         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6269         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6270         .state_renewal_ops = &nfs40_state_renewal_ops,
6271 };
6272
6273 #if defined(CONFIG_NFS_V4_1)
6274 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6275         .minor_version = 1,
6276         .call_sync = _nfs4_call_sync_session,
6277         .validate_stateid = nfs41_validate_delegation_stateid,
6278         .find_root_sec = nfs41_find_root_sec,
6279         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6280         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6281         .state_renewal_ops = &nfs41_state_renewal_ops,
6282 };
6283 #endif
6284
6285 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6286         [0] = &nfs_v4_0_minor_ops,
6287 #if defined(CONFIG_NFS_V4_1)
6288         [1] = &nfs_v4_1_minor_ops,
6289 #endif
6290 };
6291
6292 static const struct inode_operations nfs4_file_inode_operations = {
6293         .permission     = nfs_permission,
6294         .getattr        = nfs_getattr,
6295         .setattr        = nfs_setattr,
6296         .getxattr       = generic_getxattr,
6297         .setxattr       = generic_setxattr,
6298         .listxattr      = generic_listxattr,
6299         .removexattr    = generic_removexattr,
6300 };
6301
6302 const struct nfs_rpc_ops nfs_v4_clientops = {
6303         .version        = 4,                    /* protocol version */
6304         .dentry_ops     = &nfs4_dentry_operations,
6305         .dir_inode_ops  = &nfs4_dir_inode_operations,
6306         .file_inode_ops = &nfs4_file_inode_operations,
6307         .file_ops       = &nfs4_file_operations,
6308         .getroot        = nfs4_proc_get_root,
6309         .getattr        = nfs4_proc_getattr,
6310         .setattr        = nfs4_proc_setattr,
6311         .lookup         = nfs4_proc_lookup,
6312         .access         = nfs4_proc_access,
6313         .readlink       = nfs4_proc_readlink,
6314         .create         = nfs4_proc_create,
6315         .remove         = nfs4_proc_remove,
6316         .unlink_setup   = nfs4_proc_unlink_setup,
6317         .unlink_done    = nfs4_proc_unlink_done,
6318         .rename         = nfs4_proc_rename,
6319         .rename_setup   = nfs4_proc_rename_setup,
6320         .rename_done    = nfs4_proc_rename_done,
6321         .link           = nfs4_proc_link,
6322         .symlink        = nfs4_proc_symlink,
6323         .mkdir          = nfs4_proc_mkdir,
6324         .rmdir          = nfs4_proc_remove,
6325         .readdir        = nfs4_proc_readdir,
6326         .mknod          = nfs4_proc_mknod,
6327         .statfs         = nfs4_proc_statfs,
6328         .fsinfo         = nfs4_proc_fsinfo,
6329         .pathconf       = nfs4_proc_pathconf,
6330         .set_capabilities = nfs4_server_capabilities,
6331         .decode_dirent  = nfs4_decode_dirent,
6332         .read_setup     = nfs4_proc_read_setup,
6333         .read_done      = nfs4_read_done,
6334         .write_setup    = nfs4_proc_write_setup,
6335         .write_done     = nfs4_write_done,
6336         .commit_setup   = nfs4_proc_commit_setup,
6337         .commit_done    = nfs4_commit_done,
6338         .lock           = nfs4_proc_lock,
6339         .clear_acl_cache = nfs4_zap_acl_attr,
6340         .close_context  = nfs4_close_context,
6341         .open_context   = nfs4_atomic_open,
6342         .init_client    = nfs4_init_client,
6343         .secinfo        = nfs4_proc_secinfo,
6344 };
6345
6346 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6347         .prefix = XATTR_NAME_NFSV4_ACL,
6348         .list   = nfs4_xattr_list_nfs4_acl,
6349         .get    = nfs4_xattr_get_nfs4_acl,
6350         .set    = nfs4_xattr_set_nfs4_acl,
6351 };
6352
6353 const struct xattr_handler *nfs4_xattr_handlers[] = {
6354         &nfs4_xattr_nfs4_acl_handler,
6355         NULL
6356 };
6357
6358 /*
6359  * Local variables:
6360  *  c-basic-offset: 8
6361  * End:
6362  */