Pileus Git - ~andy/linux/blob - fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/nfs_idmap.h>
  56 #include <linux/sunrpc/bc_xprt.h>
  57 #include <linux/xattr.h>
  58 #include <linux/utsname.h>
  59 #include <linux/freezer.h>
  60
  61 #include "nfs4_fs.h"
  62 #include "delegation.h"
  63 #include "internal.h"
  64 #include "iostat.h"
  65 #include "callback.h"
  66 #include "pnfs.h"
  67
  68 #define NFSDBG_FACILITY         NFSDBG_PROC
  69
  70 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  71 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  72
  73 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  74
  75 struct nfs4_opendata;
  76 static int _nfs4_proc_open(struct nfs4_opendata *data);
  77 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  78 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  79 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  80 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  81 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  82                             struct nfs_fattr *fattr, struct iattr *sattr,
  83                             struct nfs4_state *state);
  84 #ifdef CONFIG_NFS_V4_1
  85 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  86 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  87 #endif
  88 /* Prevent leaks of NFSv4 errors into userland */
  89 static int nfs4_map_errors(int err)
  90 {
  91         if (err >= -1000)
  92                 return err;
  93         switch (err) {
  94         case -NFS4ERR_RESOURCE:
  95                 return -EREMOTEIO;
  96         case -NFS4ERR_WRONGSEC:
  97                 return -EPERM;
  98         case -NFS4ERR_BADOWNER:
  99         case -NFS4ERR_BADNAME:
 100                 return -EINVAL;
 101         default:
 102                 dprintk("%s could not handle NFSv4 error %d\n",
 103                                 __func__, -err);
 104                 break;
 105         }
 106         return -EIO;
 107 }
 108
 109 /*
 110  * This is our standard bitmap for GETATTR requests.
 111  */
 112 const u32 nfs4_fattr_bitmap[2] = {
 113         FATTR4_WORD0_TYPE
 114         | FATTR4_WORD0_CHANGE
 115         | FATTR4_WORD0_SIZE
 116         | FATTR4_WORD0_FSID
 117         | FATTR4_WORD0_FILEID,
 118         FATTR4_WORD1_MODE
 119         | FATTR4_WORD1_NUMLINKS
 120         | FATTR4_WORD1_OWNER
 121         | FATTR4_WORD1_OWNER_GROUP
 122         | FATTR4_WORD1_RAWDEV
 123         | FATTR4_WORD1_SPACE_USED
 124         | FATTR4_WORD1_TIME_ACCESS
 125         | FATTR4_WORD1_TIME_METADATA
 126         | FATTR4_WORD1_TIME_MODIFY
 127 };
 128
 129 const u32 nfs4_statfs_bitmap[2] = {
 130         FATTR4_WORD0_FILES_AVAIL
 131         | FATTR4_WORD0_FILES_FREE
 132         | FATTR4_WORD0_FILES_TOTAL,
 133         FATTR4_WORD1_SPACE_AVAIL
 134         | FATTR4_WORD1_SPACE_FREE
 135         | FATTR4_WORD1_SPACE_TOTAL
 136 };
 137
 138 const u32 nfs4_pathconf_bitmap[2] = {
 139         FATTR4_WORD0_MAXLINK
 140         | FATTR4_WORD0_MAXNAME,
 141         0
 142 };
 143
 144 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 145                         | FATTR4_WORD0_MAXREAD
 146                         | FATTR4_WORD0_MAXWRITE
 147                         | FATTR4_WORD0_LEASE_TIME,
 148                         FATTR4_WORD1_TIME_DELTA
 149                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 150                         FATTR4_WORD2_LAYOUT_BLKSIZE
 151 };
 152
 153 const u32 nfs4_fs_locations_bitmap[2] = {
 154         FATTR4_WORD0_TYPE
 155         | FATTR4_WORD0_CHANGE
 156         | FATTR4_WORD0_SIZE
 157         | FATTR4_WORD0_FSID
 158         | FATTR4_WORD0_FILEID
 159         | FATTR4_WORD0_FS_LOCATIONS,
 160         FATTR4_WORD1_MODE
 161         | FATTR4_WORD1_NUMLINKS
 162         | FATTR4_WORD1_OWNER
 163         | FATTR4_WORD1_OWNER_GROUP
 164         | FATTR4_WORD1_RAWDEV
 165         | FATTR4_WORD1_SPACE_USED
 166         | FATTR4_WORD1_TIME_ACCESS
 167         | FATTR4_WORD1_TIME_METADATA
 168         | FATTR4_WORD1_TIME_MODIFY
 169         | FATTR4_WORD1_MOUNTED_ON_FILEID
 170 };
 171
 172 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 173                 struct nfs4_readdir_arg *readdir)
 174 {
 175         __be32 *start, *p;
 176
 177         BUG_ON(readdir->count < 80);
 178         if (cookie > 2) {
 179                 readdir->cookie = cookie;
 180                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 181                 return;
 182         }
 183
 184         readdir->cookie = 0;
 185         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 186         if (cookie == 2)
 187                 return;
 188
 189         /*
 190          * NFSv4 servers do not return entries for '.' and '..'
 191          * Therefore, we fake these entries here.  We let '.'
 192          * have cookie 0 and '..' have cookie 1.  Note that
 193          * when talking to the server, we always send cookie 0
 194          * instead of 1 or 2.
 195          */
 196         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 197
 198         if (cookie == 0) {
 199                 *p++ = xdr_one;                                  /* next */
 200                 *p++ = xdr_zero;                   /* cookie, first word */
 201                 *p++ = xdr_one;                   /* cookie, second word */
 202                 *p++ = xdr_one;                             /* entry len */
 203                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 204                 p++;
 205                 *p++ = xdr_one;                         /* bitmap length */
 206                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 207                 *p++ = htonl(8);              /* attribute buffer length */
 208                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 209         }
 210
 211         *p++ = xdr_one;                                  /* next */
 212         *p++ = xdr_zero;                   /* cookie, first word */
 213         *p++ = xdr_two;                   /* cookie, second word */
 214         *p++ = xdr_two;                             /* entry len */
 215         memcpy(p, "..\0\0", 4);                         /* entry */
 216         p++;
 217         *p++ = xdr_one;                         /* bitmap length */
 218         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 219         *p++ = htonl(8);              /* attribute buffer length */
 220         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 221
 222         readdir->pgbase = (char *)p - (char *)start;
 223         readdir->count -= readdir->pgbase;
 224         kunmap_atomic(start, KM_USER0);
 225 }
 226
 227 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 228 {
 229         int res;
 230
 231         might_sleep();
 232
 233         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 234                         nfs_wait_bit_killable, TASK_KILLABLE);
 235         return res;
 236 }
 237
 238 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 239 {
 240         int res = 0;
 241
 242         might_sleep();
 243
 244         if (*timeout <= 0)
 245                 *timeout = NFS4_POLL_RETRY_MIN;
 246         if (*timeout > NFS4_POLL_RETRY_MAX)
 247                 *timeout = NFS4_POLL_RETRY_MAX;
 248         freezable_schedule_timeout_killable(*timeout);
 249         if (fatal_signal_pending(current))
 250                 res = -ERESTARTSYS;
 251         *timeout <<= 1;
 252         return res;
 253 }
 254
 255 /* This is the error handling routine for processes that are allowed
 256  * to sleep.
 257  */
 258 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 259 {
 260         struct nfs_client *clp = server->nfs_client;
 261         struct nfs4_state *state = exception->state;
 262         int ret = errorcode;
 263
 264         exception->retry = 0;
 265         switch(errorcode) {
 266                 case 0:
 267                         return 0;
 268                 case -NFS4ERR_ADMIN_REVOKED:
 269                 case -NFS4ERR_BAD_STATEID:
 270                 case -NFS4ERR_OPENMODE:
 271                         if (state == NULL)
 272                                 break;
 273                         nfs4_schedule_stateid_recovery(server, state);
 274                         goto wait_on_recovery;
 275                 case -NFS4ERR_EXPIRED:
 276                         if (state != NULL)
 277                                 nfs4_schedule_stateid_recovery(server, state);
 278                 case -NFS4ERR_STALE_STATEID:
 279                 case -NFS4ERR_STALE_CLIENTID:
 280                         nfs4_schedule_lease_recovery(clp);
 281                         goto wait_on_recovery;
 282 #if defined(CONFIG_NFS_V4_1)
 283                 case -NFS4ERR_BADSESSION:
 284                 case -NFS4ERR_BADSLOT:
 285                 case -NFS4ERR_BAD_HIGH_SLOT:
 286                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 287                 case -NFS4ERR_DEADSESSION:
 288                 case -NFS4ERR_SEQ_FALSE_RETRY:
 289                 case -NFS4ERR_SEQ_MISORDERED:
 290                         dprintk("%s ERROR: %d Reset session\n", __func__,
 291                                 errorcode);
 292                         nfs4_schedule_session_recovery(clp->cl_session);
 293                         exception->retry = 1;
 294                         break;
 295 #endif /* defined(CONFIG_NFS_V4_1) */
 296                 case -NFS4ERR_FILE_OPEN:
 297                         if (exception->timeout > HZ) {
 298                                 /* We have retried a decent amount, time to
 299                                  * fail
 300                                  */
 301                                 ret = -EBUSY;
 302                                 break;
 303                         }
 304                 case -NFS4ERR_GRACE:
 305                 case -NFS4ERR_DELAY:
 306                 case -EKEYEXPIRED:
 307                         ret = nfs4_delay(server->client, &exception->timeout);
 308                         if (ret != 0)
 309                                 break;
 310                 case -NFS4ERR_RETRY_UNCACHED_REP:
 311                 case -NFS4ERR_OLD_STATEID:
 312                         exception->retry = 1;
 313                         break;
 314                 case -NFS4ERR_BADOWNER:
 315                         /* The following works around a Linux server bug! */
 316                 case -NFS4ERR_BADNAME:
 317                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 318                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 319                                 exception->retry = 1;
 320                                 printk(KERN_WARNING "NFS: v4 server %s "
 321                                                 "does not accept raw "
 322                                                 "uid/gids. "
 323                                                 "Reenabling the idmapper.\n",
 324                                                 server->nfs_client->cl_hostname);
 325                         }
 326         }
 327         /* We failed to handle the error */
 328         return nfs4_map_errors(ret);
 329 wait_on_recovery:
 330         ret = nfs4_wait_clnt_recover(clp);
 331         if (ret == 0)
 332                 exception->retry = 1;
 333         return ret;
 334 }
 335
 336
 337 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 338 {
 339         spin_lock(&clp->cl_lock);
 340         if (time_before(clp->cl_last_renewal,timestamp))
 341                 clp->cl_last_renewal = timestamp;
 342         spin_unlock(&clp->cl_lock);
 343 }
 344
 345 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 346 {
 347         do_renew_lease(server->nfs_client, timestamp);
 348 }
 349
 350 #if defined(CONFIG_NFS_V4_1)
 351
 352 /*
 353  * nfs4_free_slot - free a slot and efficiently update slot table.
 354  *
 355  * freeing a slot is trivially done by clearing its respective bit
 356  * in the bitmap.
 357  * If the freed slotid equals highest_used_slotid we want to update it
 358  * so that the server would be able to size down the slot table if needed,
 359  * otherwise we know that the highest_used_slotid is still in use.
 360  * When updating highest_used_slotid there may be "holes" in the bitmap
 361  * so we need to scan down from highest_used_slotid to 0 looking for the now
 362  * highest slotid in use.
 363  * If none found, highest_used_slotid is set to -1.
 364  *
 365  * Must be called while holding tbl->slot_tbl_lock
 366  */
 367 static void
 368 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 369 {
 370         int slotid = free_slotid;
 371
 372         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 373         /* clear used bit in bitmap */
 374         __clear_bit(slotid, tbl->used_slots);
 375
 376         /* update highest_used_slotid when it is freed */
 377         if (slotid == tbl->highest_used_slotid) {
 378                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 379                 if (slotid < tbl->max_slots)
 380                         tbl->highest_used_slotid = slotid;
 381                 else
 382                         tbl->highest_used_slotid = -1;
 383         }
 384         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 385                 free_slotid, tbl->highest_used_slotid);
 386 }
 387
 388 /*
 389  * Signal state manager thread if session fore channel is drained
 390  */
 391 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 392 {
 393         struct rpc_task *task;
 394
 395         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 396                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 397                 if (task)
 398                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 399                 return;
 400         }
 401
 402         if (ses->fc_slot_table.highest_used_slotid != -1)
 403                 return;
 404
 405         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 406         complete(&ses->fc_slot_table.complete);
 407 }
 408
 409 /*
 410  * Signal state manager thread if session back channel is drained
 411  */
 412 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 413 {
 414         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 415             ses->bc_slot_table.highest_used_slotid != -1)
 416                 return;
 417         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 418         complete(&ses->bc_slot_table.complete);
 419 }
 420
 421 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 422 {
 423         struct nfs4_slot_table *tbl;
 424
 425         tbl = &res->sr_session->fc_slot_table;
 426         if (!res->sr_slot) {
 427                 /* just wake up the next guy waiting since
 428                  * we may have not consumed a slot after all */
 429                 dprintk("%s: No slot\n", __func__);
 430                 return;
 431         }
 432
 433         spin_lock(&tbl->slot_tbl_lock);
 434         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 435         nfs4_check_drain_fc_complete(res->sr_session);
 436         spin_unlock(&tbl->slot_tbl_lock);
 437         res->sr_slot = NULL;
 438 }
 439
 440 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 441 {
 442         unsigned long timestamp;
 443         struct nfs_client *clp;
 444
 445         /*
 446          * sr_status remains 1 if an RPC level error occurred. The server
 447          * may or may not have processed the sequence operation..
 448          * Proceed as if the server received and processed the sequence
 449          * operation.
 450          */
 451         if (res->sr_status == 1)
 452                 res->sr_status = NFS_OK;
 453
 454         /* don't increment the sequence number if the task wasn't sent */
 455         if (!RPC_WAS_SENT(task))
 456                 goto out;
 457
 458         /* Check the SEQUENCE operation status */
 459         switch (res->sr_status) {
 460         case 0:
 461                 /* Update the slot's sequence and clientid lease timer */
 462                 ++res->sr_slot->seq_nr;
 463                 timestamp = res->sr_renewal_time;
 464                 clp = res->sr_session->clp;
 465                 do_renew_lease(clp, timestamp);
 466                 /* Check sequence flags */
 467                 if (res->sr_status_flags != 0)
 468                         nfs4_schedule_lease_recovery(clp);
 469                 break;
 470         case -NFS4ERR_DELAY:
 471                 /* The server detected a resend of the RPC call and
 472                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 473                  * of RFC5661.
 474                  */
 475                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 476                         __func__,
 477                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 478                         res->sr_slot->seq_nr);
 479                 goto out_retry;
 480         default:
 481                 /* Just update the slot sequence no. */
 482                 ++res->sr_slot->seq_nr;
 483         }
 484 out:
 485         /* The session may be reset by one of the error handlers. */
 486         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 487         nfs41_sequence_free_slot(res);
 488         return 1;
 489 out_retry:
 490         if (!rpc_restart_call(task))
 491                 goto out;
 492         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 493         return 0;
 494 }
 495
 496 static int nfs4_sequence_done(struct rpc_task *task,
 497                                struct nfs4_sequence_res *res)
 498 {
 499         if (res->sr_session == NULL)
 500                 return 1;
 501         return nfs41_sequence_done(task, res);
 502 }
 503
 504 /*
 505  * nfs4_find_slot - efficiently look for a free slot
 506  *
 507  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 508  * If found, we mark the slot as used, update the highest_used_slotid,
 509  * and respectively set up the sequence operation args.
 510  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 511  *
 512  * Note: must be called with under the slot_tbl_lock.
 513  */
 514 static u8
 515 nfs4_find_slot(struct nfs4_slot_table *tbl)
 516 {
 517         int slotid;
 518         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 519         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 520
 521         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 522                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 523                 tbl->max_slots);
 524         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 525         if (slotid >= tbl->max_slots)
 526                 goto out;
 527         __set_bit(slotid, tbl->used_slots);
 528         if (slotid > tbl->highest_used_slotid)
 529                 tbl->highest_used_slotid = slotid;
 530         ret_id = slotid;
 531 out:
 532         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 533                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 534         return ret_id;
 535 }
 536
 537 int nfs41_setup_sequence(struct nfs4_session *session,
 538                                 struct nfs4_sequence_args *args,
 539                                 struct nfs4_sequence_res *res,
 540                                 int cache_reply,
 541                                 struct rpc_task *task)
 542 {
 543         struct nfs4_slot *slot;
 544         struct nfs4_slot_table *tbl;
 545         u8 slotid;
 546
 547         dprintk("--> %s\n", __func__);
 548         /* slot already allocated? */
 549         if (res->sr_slot != NULL)
 550                 return 0;
 551
 552         tbl = &session->fc_slot_table;
 553
 554         spin_lock(&tbl->slot_tbl_lock);
 555         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 556             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 557                 /* The state manager will wait until the slot table is empty */
 558                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 559                 spin_unlock(&tbl->slot_tbl_lock);
 560                 dprintk("%s session is draining\n", __func__);
 561                 return -EAGAIN;
 562         }
 563
 564         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 565             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 566                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 567                 spin_unlock(&tbl->slot_tbl_lock);
 568                 dprintk("%s enforce FIFO order\n", __func__);
 569                 return -EAGAIN;
 570         }
 571
 572         slotid = nfs4_find_slot(tbl);
 573         if (slotid == NFS4_MAX_SLOT_TABLE) {
 574                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 575                 spin_unlock(&tbl->slot_tbl_lock);
 576                 dprintk("<-- %s: no free slots\n", __func__);
 577                 return -EAGAIN;
 578         }
 579         spin_unlock(&tbl->slot_tbl_lock);
 580
 581         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 582         slot = tbl->slots + slotid;
 583         args->sa_session = session;
 584         args->sa_slotid = slotid;
 585         args->sa_cache_this = cache_reply;
 586
 587         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 588
 589         res->sr_session = session;
 590         res->sr_slot = slot;
 591         res->sr_renewal_time = jiffies;
 592         res->sr_status_flags = 0;
 593         /*
 594          * sr_status is only set in decode_sequence, and so will remain
 595          * set to 1 if an rpc level failure occurs.
 596          */
 597         res->sr_status = 1;
 598         return 0;
 599 }
 600 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 601
 602 int nfs4_setup_sequence(const struct nfs_server *server,
 603                         struct nfs4_sequence_args *args,
 604                         struct nfs4_sequence_res *res,
 605                         int cache_reply,
 606                         struct rpc_task *task)
 607 {
 608         struct nfs4_session *session = nfs4_get_session(server);
 609         int ret = 0;
 610
 611         if (session == NULL) {
 612                 args->sa_session = NULL;
 613                 res->sr_session = NULL;
 614                 goto out;
 615         }
 616
 617         dprintk("--> %s clp %p session %p sr_slot %td\n",
 618                 __func__, session->clp, session, res->sr_slot ?
 619                         res->sr_slot - session->fc_slot_table.slots : -1);
 620
 621         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 622                                    task);
 623 out:
 624         dprintk("<-- %s status=%d\n", __func__, ret);
 625         return ret;
 626 }
 627
 628 struct nfs41_call_sync_data {
 629         const struct nfs_server *seq_server;
 630         struct nfs4_sequence_args *seq_args;
 631         struct nfs4_sequence_res *seq_res;
 632         int cache_reply;
 633 };
 634
 635 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 636 {
 637         struct nfs41_call_sync_data *data = calldata;
 638
 639         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 640
 641         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 642                                 data->seq_res, data->cache_reply, task))
 643                 return;
 644         rpc_call_start(task);
 645 }
 646
 647 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 648 {
 649         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 650         nfs41_call_sync_prepare(task, calldata);
 651 }
 652
 653 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 654 {
 655         struct nfs41_call_sync_data *data = calldata;
 656
 657         nfs41_sequence_done(task, data->seq_res);
 658 }
 659
 660 struct rpc_call_ops nfs41_call_sync_ops = {
 661         .rpc_call_prepare = nfs41_call_sync_prepare,
 662         .rpc_call_done = nfs41_call_sync_done,
 663 };
 664
 665 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 666         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 667         .rpc_call_done = nfs41_call_sync_done,
 668 };
 669
 670 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 671                                    struct nfs_server *server,
 672                                    struct rpc_message *msg,
 673                                    struct nfs4_sequence_args *args,
 674                                    struct nfs4_sequence_res *res,
 675                                    int cache_reply,
 676                                    int privileged)
 677 {
 678         int ret;
 679         struct rpc_task *task;
 680         struct nfs41_call_sync_data data = {
 681                 .seq_server = server,
 682                 .seq_args = args,
 683                 .seq_res = res,
 684                 .cache_reply = cache_reply,
 685         };
 686         struct rpc_task_setup task_setup = {
 687                 .rpc_client = clnt,
 688                 .rpc_message = msg,
 689                 .callback_ops = &nfs41_call_sync_ops,
 690                 .callback_data = &data
 691         };
 692
 693         res->sr_slot = NULL;
 694         if (privileged)
 695                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 696         task = rpc_run_task(&task_setup);
 697         if (IS_ERR(task))
 698                 ret = PTR_ERR(task);
 699         else {
 700                 ret = task->tk_status;
 701                 rpc_put_task(task);
 702         }
 703         return ret;
 704 }
 705
 706 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 707                             struct nfs_server *server,
 708                             struct rpc_message *msg,
 709                             struct nfs4_sequence_args *args,
 710                             struct nfs4_sequence_res *res,
 711                             int cache_reply)
 712 {
 713         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 714 }
 715
 716 #else
 717 static int nfs4_sequence_done(struct rpc_task *task,
 718                                struct nfs4_sequence_res *res)
 719 {
 720         return 1;
 721 }
 722 #endif /* CONFIG_NFS_V4_1 */
 723
 724 int _nfs4_call_sync(struct rpc_clnt *clnt,
 725                     struct nfs_server *server,
 726                     struct rpc_message *msg,
 727                     struct nfs4_sequence_args *args,
 728                     struct nfs4_sequence_res *res,
 729                     int cache_reply)
 730 {
 731         args->sa_session = res->sr_session = NULL;
 732         return rpc_call_sync(clnt, msg, 0);
 733 }
 734
 735 static inline
 736 int nfs4_call_sync(struct rpc_clnt *clnt,
 737                    struct nfs_server *server,
 738                    struct rpc_message *msg,
 739                    struct nfs4_sequence_args *args,
 740                    struct nfs4_sequence_res *res,
 741                    int cache_reply)
 742 {
 743         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 744                                                 args, res, cache_reply);
 745 }
 746
 747 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 748 {
 749         struct nfs_inode *nfsi = NFS_I(dir);
 750
 751         spin_lock(&dir->i_lock);
 752         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 753         if (!cinfo->atomic || cinfo->before != dir->i_version)
 754                 nfs_force_lookup_revalidate(dir);
 755         dir->i_version = cinfo->after;
 756         spin_unlock(&dir->i_lock);
 757 }
 758
 759 struct nfs4_opendata {
 760         struct kref kref;
 761         struct nfs_openargs o_arg;
 762         struct nfs_openres o_res;
 763         struct nfs_open_confirmargs c_arg;
 764         struct nfs_open_confirmres c_res;
 765         struct nfs4_string owner_name;
 766         struct nfs4_string group_name;
 767         struct nfs_fattr f_attr;
 768         struct nfs_fattr dir_attr;
 769         struct dentry *dir;
 770         struct dentry *dentry;
 771         struct nfs4_state_owner *owner;
 772         struct nfs4_state *state;
 773         struct iattr attrs;
 774         unsigned long timestamp;
 775         unsigned int rpc_done : 1;
 776         int rpc_status;
 777         int cancelled;
 778 };
 779
 780
 781 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 782 {
 783         p->o_res.f_attr = &p->f_attr;
 784         p->o_res.dir_attr = &p->dir_attr;
 785         p->o_res.seqid = p->o_arg.seqid;
 786         p->c_res.seqid = p->c_arg.seqid;
 787         p->o_res.server = p->o_arg.server;
 788         nfs_fattr_init(&p->f_attr);
 789         nfs_fattr_init(&p->dir_attr);
 790         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 791 }
 792
 793 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 794                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 795                 const struct iattr *attrs,
 796                 gfp_t gfp_mask)
 797 {
 798         struct dentry *parent = dget_parent(dentry);
 799         struct inode *dir = parent->d_inode;
 800         struct nfs_server *server = NFS_SERVER(dir);
 801         struct nfs4_opendata *p;
 802
 803         p = kzalloc(sizeof(*p), gfp_mask);
 804         if (p == NULL)
 805                 goto err;
 806         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 807         if (p->o_arg.seqid == NULL)
 808                 goto err_free;
 809         nfs_sb_active(dentry->d_sb);
 810         p->dentry = dget(dentry);
 811         p->dir = parent;
 812         p->owner = sp;
 813         atomic_inc(&sp->so_count);
 814         p->o_arg.fh = NFS_FH(dir);
 815         p->o_arg.open_flags = flags;
 816         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 817         p->o_arg.clientid = server->nfs_client->cl_clientid;
 818         p->o_arg.id = sp->so_owner_id;
 819         p->o_arg.name = &dentry->d_name;
 820         p->o_arg.server = server;
 821         p->o_arg.bitmask = server->attr_bitmask;
 822         p->o_arg.dir_bitmask = server->cache_consistency_bitmask;
 823         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 824         if (flags & O_CREAT) {
 825                 u32 *s;
 826
 827                 p->o_arg.u.attrs = &p->attrs;
 828                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 829                 s = (u32 *) p->o_arg.u.verifier.data;
 830                 s[0] = jiffies;
 831                 s[1] = current->pid;
 832         }
 833         p->c_arg.fh = &p->o_res.fh;
 834         p->c_arg.stateid = &p->o_res.stateid;
 835         p->c_arg.seqid = p->o_arg.seqid;
 836         nfs4_init_opendata_res(p);
 837         kref_init(&p->kref);
 838         return p;
 839 err_free:
 840         kfree(p);
 841 err:
 842         dput(parent);
 843         return NULL;
 844 }
 845
 846 static void nfs4_opendata_free(struct kref *kref)
 847 {
 848         struct nfs4_opendata *p = container_of(kref,
 849                         struct nfs4_opendata, kref);
 850         struct super_block *sb = p->dentry->d_sb;
 851
 852         nfs_free_seqid(p->o_arg.seqid);
 853         if (p->state != NULL)
 854                 nfs4_put_open_state(p->state);
 855         nfs4_put_state_owner(p->owner);
 856         dput(p->dir);
 857         dput(p->dentry);
 858         nfs_sb_deactive(sb);
 859         nfs_fattr_free_names(&p->f_attr);
 860         kfree(p);
 861 }
 862
 863 static void nfs4_opendata_put(struct nfs4_opendata *p)
 864 {
 865         if (p != NULL)
 866                 kref_put(&p->kref, nfs4_opendata_free);
 867 }
 868
 869 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 870 {
 871         int ret;
 872
 873         ret = rpc_wait_for_completion_task(task);
 874         return ret;
 875 }
 876
 877 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 878 {
 879         int ret = 0;
 880
 881         if (open_mode & O_EXCL)
 882                 goto out;
 883         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 884                 case FMODE_READ:
 885                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 886                                 && state->n_rdonly != 0;
 887                         break;
 888                 case FMODE_WRITE:
 889                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 890                                 && state->n_wronly != 0;
 891                         break;
 892                 case FMODE_READ|FMODE_WRITE:
 893                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 894                                 && state->n_rdwr != 0;
 895         }
 896 out:
 897         return ret;
 898 }
 899
 900 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 901 {
 902         if (delegation == NULL)
 903                 return 0;
 904         if ((delegation->type & fmode) != fmode)
 905                 return 0;
 906         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 907                 return 0;
 908         nfs_mark_delegation_referenced(delegation);
 909         return 1;
 910 }
 911
 912 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 913 {
 914         switch (fmode) {
 915                 case FMODE_WRITE:
 916                         state->n_wronly++;
 917                         break;
 918                 case FMODE_READ:
 919                         state->n_rdonly++;
 920                         break;
 921                 case FMODE_READ|FMODE_WRITE:
 922                         state->n_rdwr++;
 923         }
 924         nfs4_state_set_mode_locked(state, state->state | fmode);
 925 }
 926
 927 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 928 {
 929         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 930                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 931         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 932         switch (fmode) {
 933                 case FMODE_READ:
 934                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 935                         break;
 936                 case FMODE_WRITE:
 937                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 938                         break;
 939                 case FMODE_READ|FMODE_WRITE:
 940                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 941         }
 942 }
 943
 944 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 945 {
 946         write_seqlock(&state->seqlock);
 947         nfs_set_open_stateid_locked(state, stateid, fmode);
 948         write_sequnlock(&state->seqlock);
 949 }
 950
 951 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 952 {
 953         /*
 954          * Protect the call to nfs4_state_set_mode_locked and
 955          * serialise the stateid update
 956          */
 957         write_seqlock(&state->seqlock);
 958         if (deleg_stateid != NULL) {
 959                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 960                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 961         }
 962         if (open_stateid != NULL)
 963                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 964         write_sequnlock(&state->seqlock);
 965         spin_lock(&state->owner->so_lock);
 966         update_open_stateflags(state, fmode);
 967         spin_unlock(&state->owner->so_lock);
 968 }
 969
 970 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 971 {
 972         struct nfs_inode *nfsi = NFS_I(state->inode);
 973         struct nfs_delegation *deleg_cur;
 974         int ret = 0;
 975
 976         fmode &= (FMODE_READ|FMODE_WRITE);
 977
 978         rcu_read_lock();
 979         deleg_cur = rcu_dereference(nfsi->delegation);
 980         if (deleg_cur == NULL)
 981                 goto no_delegation;
 982
 983         spin_lock(&deleg_cur->lock);
 984         if (nfsi->delegation != deleg_cur ||
 985             (deleg_cur->type & fmode) != fmode)
 986                 goto no_delegation_unlock;
 987
 988         if (delegation == NULL)
 989                 delegation = &deleg_cur->stateid;
 990         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 991                 goto no_delegation_unlock;
 992
 993         nfs_mark_delegation_referenced(deleg_cur);
 994         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 995         ret = 1;
 996 no_delegation_unlock:
 997         spin_unlock(&deleg_cur->lock);
 998 no_delegation:
 999         rcu_read_unlock();
1000
1001         if (!ret && open_stateid != NULL) {
1002                 __update_open_stateid(state, open_stateid, NULL, fmode);
1003                 ret = 1;
1004         }
1005
1006         return ret;
1007 }
1008
1009
1010 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1011 {
1012         struct nfs_delegation *delegation;
1013
1014         rcu_read_lock();
1015         delegation = rcu_dereference(NFS_I(inode)->delegation);
1016         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1017                 rcu_read_unlock();
1018                 return;
1019         }
1020         rcu_read_unlock();
1021         nfs_inode_return_delegation(inode);
1022 }
1023
1024 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1025 {
1026         struct nfs4_state *state = opendata->state;
1027         struct nfs_inode *nfsi = NFS_I(state->inode);
1028         struct nfs_delegation *delegation;
1029         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1030         fmode_t fmode = opendata->o_arg.fmode;
1031         nfs4_stateid stateid;
1032         int ret = -EAGAIN;
1033
1034         for (;;) {
1035                 if (can_open_cached(state, fmode, open_mode)) {
1036                         spin_lock(&state->owner->so_lock);
1037                         if (can_open_cached(state, fmode, open_mode)) {
1038                                 update_open_stateflags(state, fmode);
1039                                 spin_unlock(&state->owner->so_lock);
1040                                 goto out_return_state;
1041                         }
1042                         spin_unlock(&state->owner->so_lock);
1043                 }
1044                 rcu_read_lock();
1045                 delegation = rcu_dereference(nfsi->delegation);
1046                 if (!can_open_delegated(delegation, fmode)) {
1047                         rcu_read_unlock();
1048                         break;
1049                 }
1050                 /* Save the delegation */
1051                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1052                 rcu_read_unlock();
1053                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1054                 if (ret != 0)
1055                         goto out;
1056                 ret = -EAGAIN;
1057
1058                 /* Try to update the stateid using the delegation */
1059                 if (update_open_stateid(state, NULL, &stateid, fmode))
1060                         goto out_return_state;
1061         }
1062 out:
1063         return ERR_PTR(ret);
1064 out_return_state:
1065         atomic_inc(&state->count);
1066         return state;
1067 }
1068
1069 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1070 {
1071         struct inode *inode;
1072         struct nfs4_state *state = NULL;
1073         struct nfs_delegation *delegation;
1074         int ret;
1075
1076         if (!data->rpc_done) {
1077                 state = nfs4_try_open_cached(data);
1078                 goto out;
1079         }
1080
1081         ret = -EAGAIN;
1082         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1083                 goto err;
1084         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1085         ret = PTR_ERR(inode);
1086         if (IS_ERR(inode))
1087                 goto err;
1088         ret = -ENOMEM;
1089         state = nfs4_get_open_state(inode, data->owner);
1090         if (state == NULL)
1091                 goto err_put_inode;
1092         if (data->o_res.delegation_type != 0) {
1093                 int delegation_flags = 0;
1094
1095                 rcu_read_lock();
1096                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1097                 if (delegation)
1098                         delegation_flags = delegation->flags;
1099                 rcu_read_unlock();
1100                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1101                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1102                                         "returning a delegation for "
1103                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1104                                         NFS_CLIENT(inode)->cl_server);
1105                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1106                         nfs_inode_set_delegation(state->inode,
1107                                         data->owner->so_cred,
1108                                         &data->o_res);
1109                 else
1110                         nfs_inode_reclaim_delegation(state->inode,
1111                                         data->owner->so_cred,
1112                                         &data->o_res);
1113         }
1114
1115         update_open_stateid(state, &data->o_res.stateid, NULL,
1116                         data->o_arg.fmode);
1117         iput(inode);
1118 out:
1119         return state;
1120 err_put_inode:
1121         iput(inode);
1122 err:
1123         return ERR_PTR(ret);
1124 }
1125
1126 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1127 {
1128         struct nfs_inode *nfsi = NFS_I(state->inode);
1129         struct nfs_open_context *ctx;
1130
1131         spin_lock(&state->inode->i_lock);
1132         list_for_each_entry(ctx, &nfsi->open_files, list) {
1133                 if (ctx->state != state)
1134                         continue;
1135                 get_nfs_open_context(ctx);
1136                 spin_unlock(&state->inode->i_lock);
1137                 return ctx;
1138         }
1139         spin_unlock(&state->inode->i_lock);
1140         return ERR_PTR(-ENOENT);
1141 }
1142
1143 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1144 {
1145         struct nfs4_opendata *opendata;
1146
1147         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1148         if (opendata == NULL)
1149                 return ERR_PTR(-ENOMEM);
1150         opendata->state = state;
1151         atomic_inc(&state->count);
1152         return opendata;
1153 }
1154
1155 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1156 {
1157         struct nfs4_state *newstate;
1158         int ret;
1159
1160         opendata->o_arg.open_flags = 0;
1161         opendata->o_arg.fmode = fmode;
1162         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1163         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1164         nfs4_init_opendata_res(opendata);
1165         ret = _nfs4_recover_proc_open(opendata);
1166         if (ret != 0)
1167                 return ret;
1168         newstate = nfs4_opendata_to_nfs4_state(opendata);
1169         if (IS_ERR(newstate))
1170                 return PTR_ERR(newstate);
1171         nfs4_close_state(newstate, fmode);
1172         *res = newstate;
1173         return 0;
1174 }
1175
1176 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1177 {
1178         struct nfs4_state *newstate;
1179         int ret;
1180
1181         /* memory barrier prior to reading state->n_* */
1182         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1183         smp_rmb();
1184         if (state->n_rdwr != 0) {
1185                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1186                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1187                 if (ret != 0)
1188                         return ret;
1189                 if (newstate != state)
1190                         return -ESTALE;
1191         }
1192         if (state->n_wronly != 0) {
1193                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1194                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1195                 if (ret != 0)
1196                         return ret;
1197                 if (newstate != state)
1198                         return -ESTALE;
1199         }
1200         if (state->n_rdonly != 0) {
1201                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1202                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1203                 if (ret != 0)
1204                         return ret;
1205                 if (newstate != state)
1206                         return -ESTALE;
1207         }
1208         /*
1209          * We may have performed cached opens for all three recoveries.
1210          * Check if we need to update the current stateid.
1211          */
1212         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1213             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1214                 write_seqlock(&state->seqlock);
1215                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1216                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1217                 write_sequnlock(&state->seqlock);
1218         }
1219         return 0;
1220 }
1221
1222 /*
1223  * OPEN_RECLAIM:
1224  *      reclaim state on the server after a reboot.
1225  */
1226 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1227 {
1228         struct nfs_delegation *delegation;
1229         struct nfs4_opendata *opendata;
1230         fmode_t delegation_type = 0;
1231         int status;
1232
1233         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1234         if (IS_ERR(opendata))
1235                 return PTR_ERR(opendata);
1236         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1237         opendata->o_arg.fh = NFS_FH(state->inode);
1238         rcu_read_lock();
1239         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1240         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1241                 delegation_type = delegation->type;
1242         rcu_read_unlock();
1243         opendata->o_arg.u.delegation_type = delegation_type;
1244         status = nfs4_open_recover(opendata, state);
1245         nfs4_opendata_put(opendata);
1246         return status;
1247 }
1248
1249 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1250 {
1251         struct nfs_server *server = NFS_SERVER(state->inode);
1252         struct nfs4_exception exception = { };
1253         int err;
1254         do {
1255                 err = _nfs4_do_open_reclaim(ctx, state);
1256                 if (err != -NFS4ERR_DELAY)
1257                         break;
1258                 nfs4_handle_exception(server, err, &exception);
1259         } while (exception.retry);
1260         return err;
1261 }
1262
1263 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1264 {
1265         struct nfs_open_context *ctx;
1266         int ret;
1267
1268         ctx = nfs4_state_find_open_context(state);
1269         if (IS_ERR(ctx))
1270                 return PTR_ERR(ctx);
1271         ret = nfs4_do_open_reclaim(ctx, state);
1272         put_nfs_open_context(ctx);
1273         return ret;
1274 }
1275
1276 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1277 {
1278         struct nfs4_opendata *opendata;
1279         int ret;
1280
1281         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1282         if (IS_ERR(opendata))
1283                 return PTR_ERR(opendata);
1284         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1285         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1286                         sizeof(opendata->o_arg.u.delegation.data));
1287         ret = nfs4_open_recover(opendata, state);
1288         nfs4_opendata_put(opendata);
1289         return ret;
1290 }
1291
1292 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1293 {
1294         struct nfs4_exception exception = { };
1295         struct nfs_server *server = NFS_SERVER(state->inode);
1296         int err;
1297         do {
1298                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1299                 switch (err) {
1300                         case 0:
1301                         case -ENOENT:
1302                         case -ESTALE:
1303                                 goto out;
1304                         case -NFS4ERR_BADSESSION:
1305                         case -NFS4ERR_BADSLOT:
1306                         case -NFS4ERR_BAD_HIGH_SLOT:
1307                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1308                         case -NFS4ERR_DEADSESSION:
1309                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1310                                 goto out;
1311                         case -NFS4ERR_STALE_CLIENTID:
1312                         case -NFS4ERR_STALE_STATEID:
1313                         case -NFS4ERR_EXPIRED:
1314                                 /* Don't recall a delegation if it was lost */
1315                                 nfs4_schedule_lease_recovery(server->nfs_client);
1316                                 goto out;
1317                         case -ERESTARTSYS:
1318                                 /*
1319                                  * The show must go on: exit, but mark the
1320                                  * stateid as needing recovery.
1321                                  */
1322                         case -NFS4ERR_ADMIN_REVOKED:
1323                         case -NFS4ERR_BAD_STATEID:
1324                                 nfs4_schedule_stateid_recovery(server, state);
1325                         case -EKEYEXPIRED:
1326                                 /*
1327                                  * User RPCSEC_GSS context has expired.
1328                                  * We cannot recover this stateid now, so
1329                                  * skip it and allow recovery thread to
1330                                  * proceed.
1331                                  */
1332                         case -ENOMEM:
1333                                 err = 0;
1334                                 goto out;
1335                 }
1336                 err = nfs4_handle_exception(server, err, &exception);
1337         } while (exception.retry);
1338 out:
1339         return err;
1340 }
1341
1342 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1343 {
1344         struct nfs4_opendata *data = calldata;
1345
1346         data->rpc_status = task->tk_status;
1347         if (data->rpc_status == 0) {
1348                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1349                                 sizeof(data->o_res.stateid.data));
1350                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1351                 renew_lease(data->o_res.server, data->timestamp);
1352                 data->rpc_done = 1;
1353         }
1354 }
1355
1356 static void nfs4_open_confirm_release(void *calldata)
1357 {
1358         struct nfs4_opendata *data = calldata;
1359         struct nfs4_state *state = NULL;
1360
1361         /* If this request hasn't been cancelled, do nothing */
1362         if (data->cancelled == 0)
1363                 goto out_free;
1364         /* In case of error, no cleanup! */
1365         if (!data->rpc_done)
1366                 goto out_free;
1367         state = nfs4_opendata_to_nfs4_state(data);
1368         if (!IS_ERR(state))
1369                 nfs4_close_state(state, data->o_arg.fmode);
1370 out_free:
1371         nfs4_opendata_put(data);
1372 }
1373
1374 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1375         .rpc_call_done = nfs4_open_confirm_done,
1376         .rpc_release = nfs4_open_confirm_release,
1377 };
1378
1379 /*
1380  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1381  */
1382 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1383 {
1384         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1385         struct rpc_task *task;
1386         struct  rpc_message msg = {
1387                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1388                 .rpc_argp = &data->c_arg,
1389                 .rpc_resp = &data->c_res,
1390                 .rpc_cred = data->owner->so_cred,
1391         };
1392         struct rpc_task_setup task_setup_data = {
1393                 .rpc_client = server->client,
1394                 .rpc_message = &msg,
1395                 .callback_ops = &nfs4_open_confirm_ops,
1396                 .callback_data = data,
1397                 .workqueue = nfsiod_workqueue,
1398                 .flags = RPC_TASK_ASYNC,
1399         };
1400         int status;
1401
1402         kref_get(&data->kref);
1403         data->rpc_done = 0;
1404         data->rpc_status = 0;
1405         data->timestamp = jiffies;
1406         task = rpc_run_task(&task_setup_data);
1407         if (IS_ERR(task))
1408                 return PTR_ERR(task);
1409         status = nfs4_wait_for_completion_rpc_task(task);
1410         if (status != 0) {
1411                 data->cancelled = 1;
1412                 smp_wmb();
1413         } else
1414                 status = data->rpc_status;
1415         rpc_put_task(task);
1416         return status;
1417 }
1418
1419 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1420 {
1421         struct nfs4_opendata *data = calldata;
1422         struct nfs4_state_owner *sp = data->owner;
1423
1424         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1425                 return;
1426         /*
1427          * Check if we still need to send an OPEN call, or if we can use
1428          * a delegation instead.
1429          */
1430         if (data->state != NULL) {
1431                 struct nfs_delegation *delegation;
1432
1433                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1434                         goto out_no_action;
1435                 rcu_read_lock();
1436                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1437                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1438                     can_open_delegated(delegation, data->o_arg.fmode))
1439                         goto unlock_no_action;
1440                 rcu_read_unlock();
1441         }
1442         /* Update sequence id. */
1443         data->o_arg.id = sp->so_owner_id;
1444         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1445         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1446                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1447                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1448         }
1449         data->timestamp = jiffies;
1450         if (nfs4_setup_sequence(data->o_arg.server,
1451                                 &data->o_arg.seq_args,
1452                                 &data->o_res.seq_res, 1, task))
1453                 return;
1454         rpc_call_start(task);
1455         return;
1456 unlock_no_action:
1457         rcu_read_unlock();
1458 out_no_action:
1459         task->tk_action = NULL;
1460
1461 }
1462
1463 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1464 {
1465         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1466         nfs4_open_prepare(task, calldata);
1467 }
1468
1469 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1470 {
1471         struct nfs4_opendata *data = calldata;
1472
1473         data->rpc_status = task->tk_status;
1474
1475         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1476                 return;
1477
1478         if (task->tk_status == 0) {
1479                 switch (data->o_res.f_attr->mode & S_IFMT) {
1480                         case S_IFREG:
1481                                 break;
1482                         case S_IFLNK:
1483                                 data->rpc_status = -ELOOP;
1484                                 break;
1485                         case S_IFDIR:
1486                                 data->rpc_status = -EISDIR;
1487                                 break;
1488                         default:
1489                                 data->rpc_status = -ENOTDIR;
1490                 }
1491                 renew_lease(data->o_res.server, data->timestamp);
1492                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1493                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1494         }
1495         data->rpc_done = 1;
1496 }
1497
1498 static void nfs4_open_release(void *calldata)
1499 {
1500         struct nfs4_opendata *data = calldata;
1501         struct nfs4_state *state = NULL;
1502
1503         /* If this request hasn't been cancelled, do nothing */
1504         if (data->cancelled == 0)
1505                 goto out_free;
1506         /* In case of error, no cleanup! */
1507         if (data->rpc_status != 0 || !data->rpc_done)
1508                 goto out_free;
1509         /* In case we need an open_confirm, no cleanup! */
1510         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1511                 goto out_free;
1512         state = nfs4_opendata_to_nfs4_state(data);
1513         if (!IS_ERR(state))
1514                 nfs4_close_state(state, data->o_arg.fmode);
1515 out_free:
1516         nfs4_opendata_put(data);
1517 }
1518
1519 static const struct rpc_call_ops nfs4_open_ops = {
1520         .rpc_call_prepare = nfs4_open_prepare,
1521         .rpc_call_done = nfs4_open_done,
1522         .rpc_release = nfs4_open_release,
1523 };
1524
1525 static const struct rpc_call_ops nfs4_recover_open_ops = {
1526         .rpc_call_prepare = nfs4_recover_open_prepare,
1527         .rpc_call_done = nfs4_open_done,
1528         .rpc_release = nfs4_open_release,
1529 };
1530
1531 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1532 {
1533         struct inode *dir = data->dir->d_inode;
1534         struct nfs_server *server = NFS_SERVER(dir);
1535         struct nfs_openargs *o_arg = &data->o_arg;
1536         struct nfs_openres *o_res = &data->o_res;
1537         struct rpc_task *task;
1538         struct rpc_message msg = {
1539                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1540                 .rpc_argp = o_arg,
1541                 .rpc_resp = o_res,
1542                 .rpc_cred = data->owner->so_cred,
1543         };
1544         struct rpc_task_setup task_setup_data = {
1545                 .rpc_client = server->client,
1546                 .rpc_message = &msg,
1547                 .callback_ops = &nfs4_open_ops,
1548                 .callback_data = data,
1549                 .workqueue = nfsiod_workqueue,
1550                 .flags = RPC_TASK_ASYNC,
1551         };
1552         int status;
1553
1554         kref_get(&data->kref);
1555         data->rpc_done = 0;
1556         data->rpc_status = 0;
1557         data->cancelled = 0;
1558         if (isrecover)
1559                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1560         task = rpc_run_task(&task_setup_data);
1561         if (IS_ERR(task))
1562                 return PTR_ERR(task);
1563         status = nfs4_wait_for_completion_rpc_task(task);
1564         if (status != 0) {
1565                 data->cancelled = 1;
1566                 smp_wmb();
1567         } else
1568                 status = data->rpc_status;
1569         rpc_put_task(task);
1570
1571         return status;
1572 }
1573
1574 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1575 {
1576         struct inode *dir = data->dir->d_inode;
1577         struct nfs_openres *o_res = &data->o_res;
1578         int status;
1579
1580         status = nfs4_run_open_task(data, 1);
1581         if (status != 0 || !data->rpc_done)
1582                 return status;
1583
1584         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1585
1586         nfs_refresh_inode(dir, o_res->dir_attr);
1587
1588         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1589                 status = _nfs4_proc_open_confirm(data);
1590                 if (status != 0)
1591                         return status;
1592         }
1593
1594         return status;
1595 }
1596
1597 /*
1598  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1599  */
1600 static int _nfs4_proc_open(struct nfs4_opendata *data)
1601 {
1602         struct inode *dir = data->dir->d_inode;
1603         struct nfs_server *server = NFS_SERVER(dir);
1604         struct nfs_openargs *o_arg = &data->o_arg;
1605         struct nfs_openres *o_res = &data->o_res;
1606         int status;
1607
1608         status = nfs4_run_open_task(data, 0);
1609         if (!data->rpc_done)
1610                 return status;
1611         if (status != 0) {
1612                 if (status == -NFS4ERR_BADNAME &&
1613                                 !(o_arg->open_flags & O_CREAT))
1614                         return -ENOENT;
1615                 return status;
1616         }
1617
1618         nfs_fattr_map_and_free_names(server, &data->f_attr);
1619
1620         if (o_arg->open_flags & O_CREAT) {
1621                 update_changeattr(dir, &o_res->cinfo);
1622                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1623         } else
1624                 nfs_refresh_inode(dir, o_res->dir_attr);
1625         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1626                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1627         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1628                 status = _nfs4_proc_open_confirm(data);
1629                 if (status != 0)
1630                         return status;
1631         }
1632         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1633                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1634         return 0;
1635 }
1636
1637 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1638 {
1639         unsigned int loop;
1640         int ret;
1641
1642         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1643                 ret = nfs4_wait_clnt_recover(clp);
1644                 if (ret != 0)
1645                         break;
1646                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1647                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1648                         break;
1649                 nfs4_schedule_state_manager(clp);
1650                 ret = -EIO;
1651         }
1652         return ret;
1653 }
1654
1655 static int nfs4_recover_expired_lease(struct nfs_server *server)
1656 {
1657         return nfs4_client_recover_expired_lease(server->nfs_client);
1658 }
1659
1660 /*
1661  * OPEN_EXPIRED:
1662  *      reclaim state on the server after a network partition.
1663  *      Assumes caller holds the appropriate lock
1664  */
1665 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1666 {
1667         struct nfs4_opendata *opendata;
1668         int ret;
1669
1670         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1671         if (IS_ERR(opendata))
1672                 return PTR_ERR(opendata);
1673         ret = nfs4_open_recover(opendata, state);
1674         if (ret == -ESTALE)
1675                 d_drop(ctx->dentry);
1676         nfs4_opendata_put(opendata);
1677         return ret;
1678 }
1679
1680 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1681 {
1682         struct nfs_server *server = NFS_SERVER(state->inode);
1683         struct nfs4_exception exception = { };
1684         int err;
1685
1686         do {
1687                 err = _nfs4_open_expired(ctx, state);
1688                 switch (err) {
1689                 default:
1690                         goto out;
1691                 case -NFS4ERR_GRACE:
1692                 case -NFS4ERR_DELAY:
1693                         nfs4_handle_exception(server, err, &exception);
1694                         err = 0;
1695                 }
1696         } while (exception.retry);
1697 out:
1698         return err;
1699 }
1700
1701 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1702 {
1703         struct nfs_open_context *ctx;
1704         int ret;
1705
1706         ctx = nfs4_state_find_open_context(state);
1707         if (IS_ERR(ctx))
1708                 return PTR_ERR(ctx);
1709         ret = nfs4_do_open_expired(ctx, state);
1710         put_nfs_open_context(ctx);
1711         return ret;
1712 }
1713
1714 #if defined(CONFIG_NFS_V4_1)
1715 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1716 {
1717         int status;
1718         struct nfs_server *server = NFS_SERVER(state->inode);
1719
1720         status = nfs41_test_stateid(server, state);
1721         if (status == NFS_OK)
1722                 return 0;
1723         nfs41_free_stateid(server, state);
1724         return nfs4_open_expired(sp, state);
1725 }
1726 #endif
1727
1728 /*
1729  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1730  * fields corresponding to attributes that were used to store the verifier.
1731  * Make sure we clobber those fields in the later setattr call
1732  */
1733 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1734 {
1735         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1736             !(sattr->ia_valid & ATTR_ATIME_SET))
1737                 sattr->ia_valid |= ATTR_ATIME;
1738
1739         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1740             !(sattr->ia_valid & ATTR_MTIME_SET))
1741                 sattr->ia_valid |= ATTR_MTIME;
1742 }
1743
1744 /*
1745  * Returns a referenced nfs4_state
1746  */
1747 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)
1748 {
1749         struct nfs4_state_owner  *sp;
1750         struct nfs4_state     *state = NULL;
1751         struct nfs_server       *server = NFS_SERVER(dir);
1752         struct nfs4_opendata *opendata;
1753         int status;
1754
1755         /* Protect against reboot recovery conflicts */
1756         status = -ENOMEM;
1757         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1758         if (sp == NULL) {
1759                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1760                 goto out_err;
1761         }
1762         status = nfs4_recover_expired_lease(server);
1763         if (status != 0)
1764                 goto err_put_state_owner;
1765         if (dentry->d_inode != NULL)
1766                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1767         status = -ENOMEM;
1768         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1769         if (opendata == NULL)
1770                 goto err_put_state_owner;
1771
1772         if (dentry->d_inode != NULL)
1773                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1774
1775         status = _nfs4_proc_open(opendata);
1776         if (status != 0)
1777                 goto err_opendata_put;
1778
1779         state = nfs4_opendata_to_nfs4_state(opendata);
1780         status = PTR_ERR(state);
1781         if (IS_ERR(state))
1782                 goto err_opendata_put;
1783         if (server->caps & NFS_CAP_POSIX_LOCK)
1784                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1785
1786         if (opendata->o_arg.open_flags & O_EXCL) {
1787                 nfs4_exclusive_attrset(opendata, sattr);
1788
1789                 nfs_fattr_init(opendata->o_res.f_attr);
1790                 status = nfs4_do_setattr(state->inode, cred,
1791                                 opendata->o_res.f_attr, sattr,
1792                                 state);
1793                 if (status == 0)
1794                         nfs_setattr_update_inode(state->inode, sattr);
1795                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1796         }
1797         nfs4_opendata_put(opendata);
1798         nfs4_put_state_owner(sp);
1799         *res = state;
1800         return 0;
1801 err_opendata_put:
1802         nfs4_opendata_put(opendata);
1803 err_put_state_owner:
1804         nfs4_put_state_owner(sp);
1805 out_err:
1806         *res = NULL;
1807         return status;
1808 }
1809
1810
1811 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)
1812 {
1813         struct nfs4_exception exception = { };
1814         struct nfs4_state *res;
1815         int status;
1816
1817         do {
1818                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1819                 if (status == 0)
1820                         break;
1821                 /* NOTE: BAD_SEQID means the server and client disagree about the
1822                  * book-keeping w.r.t. state-changing operations
1823                  * (OPEN/CLOSE/LOCK/LOCKU...)
1824                  * It is actually a sign of a bug on the client or on the server.
1825                  *
1826                  * If we receive a BAD_SEQID error in the particular case of
1827                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1828                  * have unhashed the old state_owner for us, and that we can
1829                  * therefore safely retry using a new one. We should still warn
1830                  * the user though...
1831                  */
1832                 if (status == -NFS4ERR_BAD_SEQID) {
1833                         printk(KERN_WARNING "NFS: v4 server %s "
1834                                         " returned a bad sequence-id error!\n",
1835                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1836                         exception.retry = 1;
1837                         continue;
1838                 }
1839                 /*
1840                  * BAD_STATEID on OPEN means that the server cancelled our
1841                  * state before it received the OPEN_CONFIRM.
1842                  * Recover by retrying the request as per the discussion
1843                  * on Page 181 of RFC3530.
1844                  */
1845                 if (status == -NFS4ERR_BAD_STATEID) {
1846                         exception.retry = 1;
1847                         continue;
1848                 }
1849                 if (status == -EAGAIN) {
1850                         /* We must have found a delegation */
1851                         exception.retry = 1;
1852                         continue;
1853                 }
1854                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1855                                         status, &exception));
1856         } while (exception.retry);
1857         return res;
1858 }
1859
1860 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1861                             struct nfs_fattr *fattr, struct iattr *sattr,
1862                             struct nfs4_state *state)
1863 {
1864         struct nfs_server *server = NFS_SERVER(inode);
1865         struct nfs_setattrargs  arg = {
1866                 .fh             = NFS_FH(inode),
1867                 .iap            = sattr,
1868                 .server         = server,
1869                 .bitmask = server->attr_bitmask,
1870         };
1871         struct nfs_setattrres  res = {
1872                 .fattr          = fattr,
1873                 .server         = server,
1874         };
1875         struct rpc_message msg = {
1876                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1877                 .rpc_argp       = &arg,
1878                 .rpc_resp       = &res,
1879                 .rpc_cred       = cred,
1880         };
1881         unsigned long timestamp = jiffies;
1882         int status;
1883
1884         nfs_fattr_init(fattr);
1885
1886         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1887                 /* Use that stateid */
1888         } else if (state != NULL) {
1889                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1890         } else
1891                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1892
1893         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1894         if (status == 0 && state != NULL)
1895                 renew_lease(server, timestamp);
1896         return status;
1897 }
1898
1899 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1900                            struct nfs_fattr *fattr, struct iattr *sattr,
1901                            struct nfs4_state *state)
1902 {
1903         struct nfs_server *server = NFS_SERVER(inode);
1904         struct nfs4_exception exception = { };
1905         int err;
1906         do {
1907                 err = nfs4_handle_exception(server,
1908                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1909                                 &exception);
1910         } while (exception.retry);
1911         return err;
1912 }
1913
1914 struct nfs4_closedata {
1915         struct inode *inode;
1916         struct nfs4_state *state;
1917         struct nfs_closeargs arg;
1918         struct nfs_closeres res;
1919         struct nfs_fattr fattr;
1920         unsigned long timestamp;
1921         bool roc;
1922         u32 roc_barrier;
1923 };
1924
1925 static void nfs4_free_closedata(void *data)
1926 {
1927         struct nfs4_closedata *calldata = data;
1928         struct nfs4_state_owner *sp = calldata->state->owner;
1929         struct super_block *sb = calldata->state->inode->i_sb;
1930
1931         if (calldata->roc)
1932                 pnfs_roc_release(calldata->state->inode);
1933         nfs4_put_open_state(calldata->state);
1934         nfs_free_seqid(calldata->arg.seqid);
1935         nfs4_put_state_owner(sp);
1936         nfs_sb_deactive(sb);
1937         kfree(calldata);
1938 }
1939
1940 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1941                 fmode_t fmode)
1942 {
1943         spin_lock(&state->owner->so_lock);
1944         if (!(fmode & FMODE_READ))
1945                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1946         if (!(fmode & FMODE_WRITE))
1947                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1948         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1949         spin_unlock(&state->owner->so_lock);
1950 }
1951
1952 static void nfs4_close_done(struct rpc_task *task, void *data)
1953 {
1954         struct nfs4_closedata *calldata = data;
1955         struct nfs4_state *state = calldata->state;
1956         struct nfs_server *server = NFS_SERVER(calldata->inode);
1957
1958         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1959                 return;
1960         /* hmm. we are done with the inode, and in the process of freeing
1961          * the state_owner. we keep this around to process errors
1962          */
1963         switch (task->tk_status) {
1964                 case 0:
1965                         if (calldata->roc)
1966                                 pnfs_roc_set_barrier(state->inode,
1967                                                      calldata->roc_barrier);
1968                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1969                         renew_lease(server, calldata->timestamp);
1970                         nfs4_close_clear_stateid_flags(state,
1971                                         calldata->arg.fmode);
1972                         break;
1973                 case -NFS4ERR_STALE_STATEID:
1974                 case -NFS4ERR_OLD_STATEID:
1975                 case -NFS4ERR_BAD_STATEID:
1976                 case -NFS4ERR_EXPIRED:
1977                         if (calldata->arg.fmode == 0)
1978                                 break;
1979                 default:
1980                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1981                                 rpc_restart_call_prepare(task);
1982         }
1983         nfs_release_seqid(calldata->arg.seqid);
1984         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1985 }
1986
1987 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1988 {
1989         struct nfs4_closedata *calldata = data;
1990         struct nfs4_state *state = calldata->state;
1991         int call_close = 0;
1992
1993         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1994                 return;
1995
1996         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1997         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1998         spin_lock(&state->owner->so_lock);
1999         /* Calculate the change in open mode */
2000         if (state->n_rdwr == 0) {
2001                 if (state->n_rdonly == 0) {
2002                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2003                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2004                         calldata->arg.fmode &= ~FMODE_READ;
2005                 }
2006                 if (state->n_wronly == 0) {
2007                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2008                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2009                         calldata->arg.fmode &= ~FMODE_WRITE;
2010                 }
2011         }
2012         spin_unlock(&state->owner->so_lock);
2013
2014         if (!call_close) {
2015                 /* Note: exit _without_ calling nfs4_close_done */
2016                 task->tk_action = NULL;
2017                 return;
2018         }
2019
2020         if (calldata->arg.fmode == 0) {
2021                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2022                 if (calldata->roc &&
2023                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2024                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2025                                      task, NULL);
2026                         return;
2027                 }
2028         }
2029
2030         nfs_fattr_init(calldata->res.fattr);
2031         calldata->timestamp = jiffies;
2032         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2033                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2034                                 1, task))
2035                 return;
2036         rpc_call_start(task);
2037 }
2038
2039 static const struct rpc_call_ops nfs4_close_ops = {
2040         .rpc_call_prepare = nfs4_close_prepare,
2041         .rpc_call_done = nfs4_close_done,
2042         .rpc_release = nfs4_free_closedata,
2043 };
2044
2045 /*
2046  * It is possible for data to be read/written from a mem-mapped file
2047  * after the sys_close call (which hits the vfs layer as a flush).
2048  * This means that we can't safely call nfsv4 close on a file until
2049  * the inode is cleared. This in turn means that we are not good
2050  * NFSv4 citizens - we do not indicate to the server to update the file's
2051  * share state even when we are done with one of the three share
2052  * stateid's in the inode.
2053  *
2054  * NOTE: Caller must be holding the sp->so_owner semaphore!
2055  */
2056 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2057 {
2058         struct nfs_server *server = NFS_SERVER(state->inode);
2059         struct nfs4_closedata *calldata;
2060         struct nfs4_state_owner *sp = state->owner;
2061         struct rpc_task *task;
2062         struct rpc_message msg = {
2063                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2064                 .rpc_cred = state->owner->so_cred,
2065         };
2066         struct rpc_task_setup task_setup_data = {
2067                 .rpc_client = server->client,
2068                 .rpc_message = &msg,
2069                 .callback_ops = &nfs4_close_ops,
2070                 .workqueue = nfsiod_workqueue,
2071                 .flags = RPC_TASK_ASYNC,
2072         };
2073         int status = -ENOMEM;
2074
2075         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2076         if (calldata == NULL)
2077                 goto out;
2078         calldata->inode = state->inode;
2079         calldata->state = state;
2080         calldata->arg.fh = NFS_FH(state->inode);
2081         calldata->arg.stateid = &state->open_stateid;
2082         /* Serialization for the sequence id */
2083         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2084         if (calldata->arg.seqid == NULL)
2085                 goto out_free_calldata;
2086         calldata->arg.fmode = 0;
2087         calldata->arg.bitmask = server->cache_consistency_bitmask;
2088         calldata->res.fattr = &calldata->fattr;
2089         calldata->res.seqid = calldata->arg.seqid;
2090         calldata->res.server = server;
2091         calldata->roc = roc;
2092         nfs_sb_active(calldata->inode->i_sb);
2093
2094         msg.rpc_argp = &calldata->arg;
2095         msg.rpc_resp = &calldata->res;
2096         task_setup_data.callback_data = calldata;
2097         task = rpc_run_task(&task_setup_data);
2098         if (IS_ERR(task))
2099                 return PTR_ERR(task);
2100         status = 0;
2101         if (wait)
2102                 status = rpc_wait_for_completion_task(task);
2103         rpc_put_task(task);
2104         return status;
2105 out_free_calldata:
2106         kfree(calldata);
2107 out:
2108         if (roc)
2109                 pnfs_roc_release(state->inode);
2110         nfs4_put_open_state(state);
2111         nfs4_put_state_owner(sp);
2112         return status;
2113 }
2114
2115 static struct inode *
2116 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2117 {
2118         struct nfs4_state *state;
2119
2120         /* Protect against concurrent sillydeletes */
2121         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2122         if (IS_ERR(state))
2123                 return ERR_CAST(state);
2124         ctx->state = state;
2125         return igrab(state->inode);
2126 }
2127
2128 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2129 {
2130         if (ctx->state == NULL)
2131                 return;
2132         if (is_sync)
2133                 nfs4_close_sync(ctx->state, ctx->mode);
2134         else
2135                 nfs4_close_state(ctx->state, ctx->mode);
2136 }
2137
2138 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2139 {
2140         struct nfs4_server_caps_arg args = {
2141                 .fhandle = fhandle,
2142         };
2143         struct nfs4_server_caps_res res = {};
2144         struct rpc_message msg = {
2145                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2146                 .rpc_argp = &args,
2147                 .rpc_resp = &res,
2148         };
2149         int status;
2150
2151         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2152         if (status == 0) {
2153                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2154                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2155                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2156                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2157                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2158                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2159                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2160                         server->caps |= NFS_CAP_ACLS;
2161                 if (res.has_links != 0)
2162                         server->caps |= NFS_CAP_HARDLINKS;
2163                 if (res.has_symlinks != 0)
2164                         server->caps |= NFS_CAP_SYMLINKS;
2165                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2166                         server->caps |= NFS_CAP_FILEID;
2167                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2168                         server->caps |= NFS_CAP_MODE;
2169                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2170                         server->caps |= NFS_CAP_NLINK;
2171                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2172                         server->caps |= NFS_CAP_OWNER;
2173                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2174                         server->caps |= NFS_CAP_OWNER_GROUP;
2175                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2176                         server->caps |= NFS_CAP_ATIME;
2177                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2178                         server->caps |= NFS_CAP_CTIME;
2179                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2180                         server->caps |= NFS_CAP_MTIME;
2181
2182                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2183                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2184                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2185                 server->acl_bitmask = res.acl_bitmask;
2186         }
2187
2188         return status;
2189 }
2190
2191 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2192 {
2193         struct nfs4_exception exception = { };
2194         int err;
2195         do {
2196                 err = nfs4_handle_exception(server,
2197                                 _nfs4_server_capabilities(server, fhandle),
2198                                 &exception);
2199         } while (exception.retry);
2200         return err;
2201 }
2202
2203 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2204                 struct nfs_fsinfo *info)
2205 {
2206         struct nfs4_lookup_root_arg args = {
2207                 .bitmask = nfs4_fattr_bitmap,
2208         };
2209         struct nfs4_lookup_res res = {
2210                 .server = server,
2211                 .fattr = info->fattr,
2212                 .fh = fhandle,
2213         };
2214         struct rpc_message msg = {
2215                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2216                 .rpc_argp = &args,
2217                 .rpc_resp = &res,
2218         };
2219
2220         nfs_fattr_init(info->fattr);
2221         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2222 }
2223
2224 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2225                 struct nfs_fsinfo *info)
2226 {
2227         struct nfs4_exception exception = { };
2228         int err;
2229         do {
2230                 err = _nfs4_lookup_root(server, fhandle, info);
2231                 switch (err) {
2232                 case 0:
2233                 case -NFS4ERR_WRONGSEC:
2234                         break;
2235                 default:
2236                         err = nfs4_handle_exception(server, err, &exception);
2237                 }
2238         } while (exception.retry);
2239         return err;
2240 }
2241
2242 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2243                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2244 {
2245         struct rpc_auth *auth;
2246         int ret;
2247
2248         auth = rpcauth_create(flavor, server->client);
2249         if (!auth) {
2250                 ret = -EIO;
2251                 goto out;
2252         }
2253         ret = nfs4_lookup_root(server, fhandle, info);
2254 out:
2255         return ret;
2256 }
2257
2258 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2259                               struct nfs_fsinfo *info)
2260 {
2261         int i, len, status = 0;
2262         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2263
2264         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2265         flav_array[len] = RPC_AUTH_NULL;
2266         len += 1;
2267
2268         for (i = 0; i < len; i++) {
2269                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2270                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2271                         continue;
2272                 break;
2273         }
2274         /*
2275          * -EACCESS could mean that the user doesn't have correct permissions
2276          * to access the mount.  It could also mean that we tried to mount
2277          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2278          * existing mount programs don't handle -EACCES very well so it should
2279          * be mapped to -EPERM instead.
2280          */
2281         if (status == -EACCES)
2282                 status = -EPERM;
2283         return status;
2284 }
2285
2286 /*
2287  * get the file handle for the "/" directory on the server
2288  */
2289 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2290                               struct nfs_fsinfo *info)
2291 {
2292         int minor_version = server->nfs_client->cl_minorversion;
2293         int status = nfs4_lookup_root(server, fhandle, info);
2294         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2295                 /*
2296                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2297                  * by nfs4_map_errors() as this function exits.
2298                  */
2299                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2300         if (status == 0)
2301                 status = nfs4_server_capabilities(server, fhandle);
2302         if (status == 0)
2303                 status = nfs4_do_fsinfo(server, fhandle, info);
2304         return nfs4_map_errors(status);
2305 }
2306
2307 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2308 /*
2309  * Get locations and (maybe) other attributes of a referral.
2310  * Note that we'll actually follow the referral later when
2311  * we detect fsid mismatch in inode revalidation
2312  */
2313 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2314                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2315 {
2316         int status = -ENOMEM;
2317         struct page *page = NULL;
2318         struct nfs4_fs_locations *locations = NULL;
2319
2320         page = alloc_page(GFP_KERNEL);
2321         if (page == NULL)
2322                 goto out;
2323         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2324         if (locations == NULL)
2325                 goto out;
2326
2327         status = nfs4_proc_fs_locations(dir, name, locations, page);
2328         if (status != 0)
2329                 goto out;
2330         /* Make sure server returned a different fsid for the referral */
2331         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2332                 dprintk("%s: server did not return a different fsid for"
2333                         " a referral at %s\n", __func__, name->name);
2334                 status = -EIO;
2335                 goto out;
2336         }
2337         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2338         nfs_fixup_referral_attributes(&locations->fattr);
2339
2340         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2341         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2342         memset(fhandle, 0, sizeof(struct nfs_fh));
2343 out:
2344         if (page)
2345                 __free_page(page);
2346         kfree(locations);
2347         return status;
2348 }
2349
2350 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2351 {
2352         struct nfs4_getattr_arg args = {
2353                 .fh = fhandle,
2354                 .bitmask = server->attr_bitmask,
2355         };
2356         struct nfs4_getattr_res res = {
2357                 .fattr = fattr,
2358                 .server = server,
2359         };
2360         struct rpc_message msg = {
2361                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2362                 .rpc_argp = &args,
2363                 .rpc_resp = &res,
2364         };
2365
2366         nfs_fattr_init(fattr);
2367         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2368 }
2369
2370 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2371 {
2372         struct nfs4_exception exception = { };
2373         int err;
2374         do {
2375                 err = nfs4_handle_exception(server,
2376                                 _nfs4_proc_getattr(server, fhandle, fattr),
2377                                 &exception);
2378         } while (exception.retry);
2379         return err;
2380 }
2381
2382 /*
2383  * The file is not closed if it is opened due to the a request to change
2384  * the size of the file. The open call will not be needed once the
2385  * VFS layer lookup-intents are implemented.
2386  *
2387  * Close is called when the inode is destroyed.
2388  * If we haven't opened the file for O_WRONLY, we
2389  * need to in the size_change case to obtain a stateid.
2390  *
2391  * Got race?
2392  * Because OPEN is always done by name in nfsv4, it is
2393  * possible that we opened a different file by the same
2394  * name.  We can recognize this race condition, but we
2395  * can't do anything about it besides returning an error.
2396  *
2397  * This will be fixed with VFS changes (lookup-intent).
2398  */
2399 static int
2400 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2401                   struct iattr *sattr)
2402 {
2403         struct inode *inode = dentry->d_inode;
2404         struct rpc_cred *cred = NULL;
2405         struct nfs4_state *state = NULL;
2406         int status;
2407
2408         if (pnfs_ld_layoutret_on_setattr(inode))
2409                 pnfs_return_layout(inode);
2410
2411         nfs_fattr_init(fattr);
2412
2413         /* Search for an existing open(O_WRITE) file */
2414         if (sattr->ia_valid & ATTR_FILE) {
2415                 struct nfs_open_context *ctx;
2416
2417                 ctx = nfs_file_open_context(sattr->ia_file);
2418                 if (ctx) {
2419                         cred = ctx->cred;
2420                         state = ctx->state;
2421                 }
2422         }
2423
2424         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2425         if (status == 0)
2426                 nfs_setattr_update_inode(inode, sattr);
2427         return status;
2428 }
2429
2430 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2431                 const struct qstr *name, struct nfs_fh *fhandle,
2432                 struct nfs_fattr *fattr)
2433 {
2434         struct nfs_server *server = NFS_SERVER(dir);
2435         int                    status;
2436         struct nfs4_lookup_arg args = {
2437                 .bitmask = server->attr_bitmask,
2438                 .dir_fh = NFS_FH(dir),
2439                 .name = name,
2440         };
2441         struct nfs4_lookup_res res = {
2442                 .server = server,
2443                 .fattr = fattr,
2444                 .fh = fhandle,
2445         };
2446         struct rpc_message msg = {
2447                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2448                 .rpc_argp = &args,
2449                 .rpc_resp = &res,
2450         };
2451
2452         nfs_fattr_init(fattr);
2453
2454         dprintk("NFS call  lookup %s\n", name->name);
2455         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2456         dprintk("NFS reply lookup: %d\n", status);
2457         return status;
2458 }
2459
2460 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2461 {
2462         memset(fh, 0, sizeof(struct nfs_fh));
2463         fattr->fsid.major = 1;
2464         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2465                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2466         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2467         fattr->nlink = 2;
2468 }
2469
2470 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2471                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2472 {
2473         struct nfs4_exception exception = { };
2474         int err;
2475         do {
2476                 int status;
2477
2478                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2479                 switch (status) {
2480                 case -NFS4ERR_BADNAME:
2481                         return -ENOENT;
2482                 case -NFS4ERR_MOVED:
2483                         return nfs4_get_referral(dir, name, fattr, fhandle);
2484                 case -NFS4ERR_WRONGSEC:
2485                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2486                 }
2487                 err = nfs4_handle_exception(NFS_SERVER(dir),
2488                                 status, &exception);
2489         } while (exception.retry);
2490         return err;
2491 }
2492
2493 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2494 {
2495         struct nfs_server *server = NFS_SERVER(inode);
2496         struct nfs4_accessargs args = {
2497                 .fh = NFS_FH(inode),
2498                 .bitmask = server->attr_bitmask,
2499         };
2500         struct nfs4_accessres res = {
2501                 .server = server,
2502         };
2503         struct rpc_message msg = {
2504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2505                 .rpc_argp = &args,
2506                 .rpc_resp = &res,
2507                 .rpc_cred = entry->cred,
2508         };
2509         int mode = entry->mask;
2510         int status;
2511
2512         /*
2513          * Determine which access bits we want to ask for...
2514          */
2515         if (mode & MAY_READ)
2516                 args.access |= NFS4_ACCESS_READ;
2517         if (S_ISDIR(inode->i_mode)) {
2518                 if (mode & MAY_WRITE)
2519                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2520                 if (mode & MAY_EXEC)
2521                         args.access |= NFS4_ACCESS_LOOKUP;
2522         } else {
2523                 if (mode & MAY_WRITE)
2524                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2525                 if (mode & MAY_EXEC)
2526                         args.access |= NFS4_ACCESS_EXECUTE;
2527         }
2528
2529         res.fattr = nfs_alloc_fattr();
2530         if (res.fattr == NULL)
2531                 return -ENOMEM;
2532
2533         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2534         if (!status) {
2535                 entry->mask = 0;
2536                 if (res.access & NFS4_ACCESS_READ)
2537                         entry->mask |= MAY_READ;
2538                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2539                         entry->mask |= MAY_WRITE;
2540                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2541                         entry->mask |= MAY_EXEC;
2542                 nfs_refresh_inode(inode, res.fattr);
2543         }
2544         nfs_free_fattr(res.fattr);
2545         return status;
2546 }
2547
2548 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2549 {
2550         struct nfs4_exception exception = { };
2551         int err;
2552         do {
2553                 err = nfs4_handle_exception(NFS_SERVER(inode),
2554                                 _nfs4_proc_access(inode, entry),
2555                                 &exception);
2556         } while (exception.retry);
2557         return err;
2558 }
2559
2560 /*
2561  * TODO: For the time being, we don't try to get any attributes
2562  * along with any of the zero-copy operations READ, READDIR,
2563  * READLINK, WRITE.
2564  *
2565  * In the case of the first three, we want to put the GETATTR
2566  * after the read-type operation -- this is because it is hard
2567  * to predict the length of a GETATTR response in v4, and thus
2568  * align the READ data correctly.  This means that the GETATTR
2569  * may end up partially falling into the page cache, and we should
2570  * shift it into the 'tail' of the xdr_buf before processing.
2571  * To do this efficiently, we need to know the total length
2572  * of data received, which doesn't seem to be available outside
2573  * of the RPC layer.
2574  *
2575  * In the case of WRITE, we also want to put the GETATTR after
2576  * the operation -- in this case because we want to make sure
2577  * we get the post-operation mtime and size.  This means that
2578  * we can't use xdr_encode_pages() as written: we need a variant
2579  * of it which would leave room in the 'tail' iovec.
2580  *
2581  * Both of these changes to the XDR layer would in fact be quite
2582  * minor, but I decided to leave them for a subsequent patch.
2583  */
2584 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2585                 unsigned int pgbase, unsigned int pglen)
2586 {
2587         struct nfs4_readlink args = {
2588                 .fh       = NFS_FH(inode),
2589                 .pgbase   = pgbase,
2590                 .pglen    = pglen,
2591                 .pages    = &page,
2592         };
2593         struct nfs4_readlink_res res;
2594         struct rpc_message msg = {
2595                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2596                 .rpc_argp = &args,
2597                 .rpc_resp = &res,
2598         };
2599
2600         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2601 }
2602
2603 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2604                 unsigned int pgbase, unsigned int pglen)
2605 {
2606         struct nfs4_exception exception = { };
2607         int err;
2608         do {
2609                 err = nfs4_handle_exception(NFS_SERVER(inode),
2610                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2611                                 &exception);
2612         } while (exception.retry);
2613         return err;
2614 }
2615
2616 /*
2617  * Got race?
2618  * We will need to arrange for the VFS layer to provide an atomic open.
2619  * Until then, this create/open method is prone to inefficiency and race
2620  * conditions due to the lookup, create, and open VFS calls from sys_open()
2621  * placed on the wire.
2622  *
2623  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2624  * The file will be opened again in the subsequent VFS open call
2625  * (nfs4_proc_file_open).
2626  *
2627  * The open for read will just hang around to be used by any process that
2628  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2629  */
2630
2631 static int
2632 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2633                  int flags, struct nfs_open_context *ctx)
2634 {
2635         struct dentry *de = dentry;
2636         struct nfs4_state *state;
2637         struct rpc_cred *cred = NULL;
2638         fmode_t fmode = 0;
2639         int status = 0;
2640
2641         if (ctx != NULL) {
2642                 cred = ctx->cred;
2643                 de = ctx->dentry;
2644                 fmode = ctx->mode;
2645         }
2646         sattr->ia_mode &= ~current_umask();
2647         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2648         d_drop(dentry);
2649         if (IS_ERR(state)) {
2650                 status = PTR_ERR(state);
2651                 goto out;
2652         }
2653         d_add(dentry, igrab(state->inode));
2654         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2655         if (ctx != NULL)
2656                 ctx->state = state;
2657         else
2658                 nfs4_close_sync(state, fmode);
2659 out:
2660         return status;
2661 }
2662
2663 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2664 {
2665         struct nfs_server *server = NFS_SERVER(dir);
2666         struct nfs_removeargs args = {
2667                 .fh = NFS_FH(dir),
2668                 .name.len = name->len,
2669                 .name.name = name->name,
2670                 .bitmask = server->attr_bitmask,
2671         };
2672         struct nfs_removeres res = {
2673                 .server = server,
2674         };
2675         struct rpc_message msg = {
2676                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2677                 .rpc_argp = &args,
2678                 .rpc_resp = &res,
2679         };
2680         int status = -ENOMEM;
2681
2682         res.dir_attr = nfs_alloc_fattr();
2683         if (res.dir_attr == NULL)
2684                 goto out;
2685
2686         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2687         if (status == 0) {
2688                 update_changeattr(dir, &res.cinfo);
2689                 nfs_post_op_update_inode(dir, res.dir_attr);
2690         }
2691         nfs_free_fattr(res.dir_attr);
2692 out:
2693         return status;
2694 }
2695
2696 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2697 {
2698         struct nfs4_exception exception = { };
2699         int err;
2700         do {
2701                 err = nfs4_handle_exception(NFS_SERVER(dir),
2702                                 _nfs4_proc_remove(dir, name),
2703                                 &exception);
2704         } while (exception.retry);
2705         return err;
2706 }
2707
2708 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2709 {
2710         struct nfs_server *server = NFS_SERVER(dir);
2711         struct nfs_removeargs *args = msg->rpc_argp;
2712         struct nfs_removeres *res = msg->rpc_resp;
2713
2714         args->bitmask = server->cache_consistency_bitmask;
2715         res->server = server;
2716         res->seq_res.sr_slot = NULL;
2717         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2718 }
2719
2720 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2721 {
2722         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2723
2724         if (!nfs4_sequence_done(task, &res->seq_res))
2725                 return 0;
2726         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2727                 return 0;
2728         update_changeattr(dir, &res->cinfo);
2729         nfs_post_op_update_inode(dir, res->dir_attr);
2730         return 1;
2731 }
2732
2733 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2734 {
2735         struct nfs_server *server = NFS_SERVER(dir);
2736         struct nfs_renameargs *arg = msg->rpc_argp;
2737         struct nfs_renameres *res = msg->rpc_resp;
2738
2739         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2740         arg->bitmask = server->attr_bitmask;
2741         res->server = server;
2742 }
2743
2744 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2745                                  struct inode *new_dir)
2746 {
2747         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2748
2749         if (!nfs4_sequence_done(task, &res->seq_res))
2750                 return 0;
2751         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2752                 return 0;
2753
2754         update_changeattr(old_dir, &res->old_cinfo);
2755         nfs_post_op_update_inode(old_dir, res->old_fattr);
2756         update_changeattr(new_dir, &res->new_cinfo);
2757         nfs_post_op_update_inode(new_dir, res->new_fattr);
2758         return 1;
2759 }
2760
2761 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2762                 struct inode *new_dir, struct qstr *new_name)
2763 {
2764         struct nfs_server *server = NFS_SERVER(old_dir);
2765         struct nfs_renameargs arg = {
2766                 .old_dir = NFS_FH(old_dir),
2767                 .new_dir = NFS_FH(new_dir),
2768                 .old_name = old_name,
2769                 .new_name = new_name,
2770                 .bitmask = server->attr_bitmask,
2771         };
2772         struct nfs_renameres res = {
2773                 .server = server,
2774         };
2775         struct rpc_message msg = {
2776                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2777                 .rpc_argp = &arg,
2778                 .rpc_resp = &res,
2779         };
2780         int status = -ENOMEM;
2781
2782         res.old_fattr = nfs_alloc_fattr();
2783         res.new_fattr = nfs_alloc_fattr();
2784         if (res.old_fattr == NULL || res.new_fattr == NULL)
2785                 goto out;
2786
2787         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2788         if (!status) {
2789                 update_changeattr(old_dir, &res.old_cinfo);
2790                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2791                 update_changeattr(new_dir, &res.new_cinfo);
2792                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2793         }
2794 out:
2795         nfs_free_fattr(res.new_fattr);
2796         nfs_free_fattr(res.old_fattr);
2797         return status;
2798 }
2799
2800 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2801                 struct inode *new_dir, struct qstr *new_name)
2802 {
2803         struct nfs4_exception exception = { };
2804         int err;
2805         do {
2806                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2807                                 _nfs4_proc_rename(old_dir, old_name,
2808                                         new_dir, new_name),
2809                                 &exception);
2810         } while (exception.retry);
2811         return err;
2812 }
2813
2814 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2815 {
2816         struct nfs_server *server = NFS_SERVER(inode);
2817         struct nfs4_link_arg arg = {
2818                 .fh     = NFS_FH(inode),
2819                 .dir_fh = NFS_FH(dir),
2820                 .name   = name,
2821                 .bitmask = server->attr_bitmask,
2822         };
2823         struct nfs4_link_res res = {
2824                 .server = server,
2825         };
2826         struct rpc_message msg = {
2827                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2828                 .rpc_argp = &arg,
2829                 .rpc_resp = &res,
2830         };
2831         int status = -ENOMEM;
2832
2833         res.fattr = nfs_alloc_fattr();
2834         res.dir_attr = nfs_alloc_fattr();
2835         if (res.fattr == NULL || res.dir_attr == NULL)
2836                 goto out;
2837
2838         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2839         if (!status) {
2840                 update_changeattr(dir, &res.cinfo);
2841                 nfs_post_op_update_inode(dir, res.dir_attr);
2842                 nfs_post_op_update_inode(inode, res.fattr);
2843         }
2844 out:
2845         nfs_free_fattr(res.dir_attr);
2846         nfs_free_fattr(res.fattr);
2847         return status;
2848 }
2849
2850 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2851 {
2852         struct nfs4_exception exception = { };
2853         int err;
2854         do {
2855                 err = nfs4_handle_exception(NFS_SERVER(inode),
2856                                 _nfs4_proc_link(inode, dir, name),
2857                                 &exception);
2858         } while (exception.retry);
2859         return err;
2860 }
2861
2862 struct nfs4_createdata {
2863         struct rpc_message msg;
2864         struct nfs4_create_arg arg;
2865         struct nfs4_create_res res;
2866         struct nfs_fh fh;
2867         struct nfs_fattr fattr;
2868         struct nfs_fattr dir_fattr;
2869 };
2870
2871 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2872                 struct qstr *name, struct iattr *sattr, u32 ftype)
2873 {
2874         struct nfs4_createdata *data;
2875
2876         data = kzalloc(sizeof(*data), GFP_KERNEL);
2877         if (data != NULL) {
2878                 struct nfs_server *server = NFS_SERVER(dir);
2879
2880                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2881                 data->msg.rpc_argp = &data->arg;
2882                 data->msg.rpc_resp = &data->res;
2883                 data->arg.dir_fh = NFS_FH(dir);
2884                 data->arg.server = server;
2885                 data->arg.name = name;
2886                 data->arg.attrs = sattr;
2887                 data->arg.ftype = ftype;
2888                 data->arg.bitmask = server->attr_bitmask;
2889                 data->res.server = server;
2890                 data->res.fh = &data->fh;
2891                 data->res.fattr = &data->fattr;
2892                 data->res.dir_fattr = &data->dir_fattr;
2893                 nfs_fattr_init(data->res.fattr);
2894                 nfs_fattr_init(data->res.dir_fattr);
2895         }
2896         return data;
2897 }
2898
2899 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2900 {
2901         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2902                                     &data->arg.seq_args, &data->res.seq_res, 1);
2903         if (status == 0) {
2904                 update_changeattr(dir, &data->res.dir_cinfo);
2905                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2906                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2907         }
2908         return status;
2909 }
2910
2911 static void nfs4_free_createdata(struct nfs4_createdata *data)
2912 {
2913         kfree(data);
2914 }
2915
2916 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2917                 struct page *page, unsigned int len, struct iattr *sattr)
2918 {
2919         struct nfs4_createdata *data;
2920         int status = -ENAMETOOLONG;
2921
2922         if (len > NFS4_MAXPATHLEN)
2923                 goto out;
2924
2925         status = -ENOMEM;
2926         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2927         if (data == NULL)
2928                 goto out;
2929
2930         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2931         data->arg.u.symlink.pages = &page;
2932         data->arg.u.symlink.len = len;
2933
2934         status = nfs4_do_create(dir, dentry, data);
2935
2936         nfs4_free_createdata(data);
2937 out:
2938         return status;
2939 }
2940
2941 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2942                 struct page *page, unsigned int len, struct iattr *sattr)
2943 {
2944         struct nfs4_exception exception = { };
2945         int err;
2946         do {
2947                 err = nfs4_handle_exception(NFS_SERVER(dir),
2948                                 _nfs4_proc_symlink(dir, dentry, page,
2949                                                         len, sattr),
2950                                 &exception);
2951         } while (exception.retry);
2952         return err;
2953 }
2954
2955 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2956                 struct iattr *sattr)
2957 {
2958         struct nfs4_createdata *data;
2959         int status = -ENOMEM;
2960
2961         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2962         if (data == NULL)
2963                 goto out;
2964
2965         status = nfs4_do_create(dir, dentry, data);
2966
2967         nfs4_free_createdata(data);
2968 out:
2969         return status;
2970 }
2971
2972 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2973                 struct iattr *sattr)
2974 {
2975         struct nfs4_exception exception = { };
2976         int err;
2977
2978         sattr->ia_mode &= ~current_umask();
2979         do {
2980                 err = nfs4_handle_exception(NFS_SERVER(dir),
2981                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2982                                 &exception);
2983         } while (exception.retry);
2984         return err;
2985 }
2986
2987 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2988                 u64 cookie, struct page **pages, unsigned int count, int plus)
2989 {
2990         struct inode            *dir = dentry->d_inode;
2991         struct nfs4_readdir_arg args = {
2992                 .fh = NFS_FH(dir),
2993                 .pages = pages,
2994                 .pgbase = 0,
2995                 .count = count,
2996                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2997                 .plus = plus,
2998         };
2999         struct nfs4_readdir_res res;
3000         struct rpc_message msg = {
3001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3002                 .rpc_argp = &args,
3003                 .rpc_resp = &res,
3004                 .rpc_cred = cred,
3005         };
3006         int                     status;
3007
3008         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3009                         dentry->d_parent->d_name.name,
3010                         dentry->d_name.name,
3011                         (unsigned long long)cookie);
3012         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3013         res.pgbase = args.pgbase;
3014         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3015         if (status >= 0) {
3016                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3017                 status += args.pgbase;
3018         }
3019
3020         nfs_invalidate_atime(dir);
3021
3022         dprintk("%s: returns %d\n", __func__, status);
3023         return status;
3024 }
3025
3026 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3027                 u64 cookie, struct page **pages, unsigned int count, int plus)
3028 {
3029         struct nfs4_exception exception = { };
3030         int err;
3031         do {
3032                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3033                                 _nfs4_proc_readdir(dentry, cred, cookie,
3034                                         pages, count, plus),
3035                                 &exception);
3036         } while (exception.retry);
3037         return err;
3038 }
3039
3040 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3041                 struct iattr *sattr, dev_t rdev)
3042 {
3043         struct nfs4_createdata *data;
3044         int mode = sattr->ia_mode;
3045         int status = -ENOMEM;
3046
3047         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3048         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3049
3050         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3051         if (data == NULL)
3052                 goto out;
3053
3054         if (S_ISFIFO(mode))
3055                 data->arg.ftype = NF4FIFO;
3056         else if (S_ISBLK(mode)) {
3057                 data->arg.ftype = NF4BLK;
3058                 data->arg.u.device.specdata1 = MAJOR(rdev);
3059                 data->arg.u.device.specdata2 = MINOR(rdev);
3060         }
3061         else if (S_ISCHR(mode)) {
3062                 data->arg.ftype = NF4CHR;
3063                 data->arg.u.device.specdata1 = MAJOR(rdev);
3064                 data->arg.u.device.specdata2 = MINOR(rdev);
3065         }
3066
3067         status = nfs4_do_create(dir, dentry, data);
3068
3069         nfs4_free_createdata(data);
3070 out:
3071         return status;
3072 }
3073
3074 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3075                 struct iattr *sattr, dev_t rdev)
3076 {
3077         struct nfs4_exception exception = { };
3078         int err;
3079
3080         sattr->ia_mode &= ~current_umask();
3081         do {
3082                 err = nfs4_handle_exception(NFS_SERVER(dir),
3083                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3084                                 &exception);
3085         } while (exception.retry);
3086         return err;
3087 }
3088
3089 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3090                  struct nfs_fsstat *fsstat)
3091 {
3092         struct nfs4_statfs_arg args = {
3093                 .fh = fhandle,
3094                 .bitmask = server->attr_bitmask,
3095         };
3096         struct nfs4_statfs_res res = {
3097                 .fsstat = fsstat,
3098         };
3099         struct rpc_message msg = {
3100                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3101                 .rpc_argp = &args,
3102                 .rpc_resp = &res,
3103         };
3104
3105         nfs_fattr_init(fsstat->fattr);
3106         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3107 }
3108
3109 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3110 {
3111         struct nfs4_exception exception = { };
3112         int err;
3113         do {
3114                 err = nfs4_handle_exception(server,
3115                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3116                                 &exception);
3117         } while (exception.retry);
3118         return err;
3119 }
3120
3121 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3122                 struct nfs_fsinfo *fsinfo)
3123 {
3124         struct nfs4_fsinfo_arg args = {
3125                 .fh = fhandle,
3126                 .bitmask = server->attr_bitmask,
3127         };
3128         struct nfs4_fsinfo_res res = {
3129                 .fsinfo = fsinfo,
3130         };
3131         struct rpc_message msg = {
3132                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3133                 .rpc_argp = &args,
3134                 .rpc_resp = &res,
3135         };
3136
3137         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3138 }
3139
3140 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3141 {
3142         struct nfs4_exception exception = { };
3143         int err;
3144
3145         do {
3146                 err = nfs4_handle_exception(server,
3147                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3148                                 &exception);
3149         } while (exception.retry);
3150         return err;
3151 }
3152
3153 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3154 {
3155         nfs_fattr_init(fsinfo->fattr);
3156         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3157 }
3158
3159 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3160                 struct nfs_pathconf *pathconf)
3161 {
3162         struct nfs4_pathconf_arg args = {
3163                 .fh = fhandle,
3164                 .bitmask = server->attr_bitmask,
3165         };
3166         struct nfs4_pathconf_res res = {
3167                 .pathconf = pathconf,
3168         };
3169         struct rpc_message msg = {
3170                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3171                 .rpc_argp = &args,
3172                 .rpc_resp = &res,
3173         };
3174
3175         /* None of the pathconf attributes are mandatory to implement */
3176         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3177                 memset(pathconf, 0, sizeof(*pathconf));
3178                 return 0;
3179         }
3180
3181         nfs_fattr_init(pathconf->fattr);
3182         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3183 }
3184
3185 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3186                 struct nfs_pathconf *pathconf)
3187 {
3188         struct nfs4_exception exception = { };
3189         int err;
3190
3191         do {
3192                 err = nfs4_handle_exception(server,
3193                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3194                                 &exception);
3195         } while (exception.retry);
3196         return err;
3197 }
3198
3199 void __nfs4_read_done_cb(struct nfs_read_data *data)
3200 {
3201         nfs_invalidate_atime(data->inode);
3202 }
3203
3204 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3205 {
3206         struct nfs_server *server = NFS_SERVER(data->inode);
3207
3208         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3209                 rpc_restart_call_prepare(task);
3210                 return -EAGAIN;
3211         }
3212
3213         __nfs4_read_done_cb(data);
3214         if (task->tk_status > 0)
3215                 renew_lease(server, data->timestamp);
3216         return 0;
3217 }
3218
3219 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3220 {
3221
3222         dprintk("--> %s\n", __func__);
3223
3224         if (!nfs4_sequence_done(task, &data->res.seq_res))
3225                 return -EAGAIN;
3226
3227         return data->read_done_cb ? data->read_done_cb(task, data) :
3228                                     nfs4_read_done_cb(task, data);
3229 }
3230
3231 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3232 {
3233         data->timestamp   = jiffies;
3234         data->read_done_cb = nfs4_read_done_cb;
3235         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3236 }
3237
3238 /* Reset the the nfs_read_data to send the read to the MDS. */
3239 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3240 {
3241         dprintk("%s Reset task for i/o through\n", __func__);
3242         put_lseg(data->lseg);
3243         data->lseg = NULL;
3244         /* offsets will differ in the dense stripe case */
3245         data->args.offset = data->mds_offset;
3246         data->ds_clp = NULL;
3247         data->args.fh     = NFS_FH(data->inode);
3248         data->read_done_cb = nfs4_read_done_cb;
3249         task->tk_ops = data->mds_ops;
3250         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3251 }
3252 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3253
3254 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3255 {
3256         struct inode *inode = data->inode;
3257
3258         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3259                 rpc_restart_call_prepare(task);
3260                 return -EAGAIN;
3261         }
3262         if (task->tk_status >= 0) {
3263                 renew_lease(NFS_SERVER(inode), data->timestamp);
3264                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3265         }
3266         return 0;
3267 }
3268
3269 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3270 {
3271         if (!nfs4_sequence_done(task, &data->res.seq_res))
3272                 return -EAGAIN;
3273         return data->write_done_cb ? data->write_done_cb(task, data) :
3274                 nfs4_write_done_cb(task, data);
3275 }
3276
3277 /* Reset the the nfs_write_data to send the write to the MDS. */
3278 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3279 {
3280         dprintk("%s Reset task for i/o through\n", __func__);
3281         put_lseg(data->lseg);
3282         data->lseg          = NULL;
3283         data->ds_clp        = NULL;
3284         data->write_done_cb = nfs4_write_done_cb;
3285         data->args.fh       = NFS_FH(data->inode);
3286         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3287         data->args.offset   = data->mds_offset;
3288         data->res.fattr     = &data->fattr;
3289         task->tk_ops        = data->mds_ops;
3290         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3291 }
3292 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3293
3294 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3295 {
3296         struct nfs_server *server = NFS_SERVER(data->inode);
3297
3298         if (data->lseg) {
3299                 data->args.bitmask = NULL;
3300                 data->res.fattr = NULL;
3301         } else
3302                 data->args.bitmask = server->cache_consistency_bitmask;
3303         if (!data->write_done_cb)
3304                 data->write_done_cb = nfs4_write_done_cb;
3305         data->res.server = server;
3306         data->timestamp   = jiffies;
3307
3308         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3309 }
3310
3311 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3312 {
3313         struct inode *inode = data->inode;
3314
3315         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3316                 rpc_restart_call_prepare(task);
3317                 return -EAGAIN;
3318         }
3319         nfs_refresh_inode(inode, data->res.fattr);
3320         return 0;
3321 }
3322
3323 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3324 {
3325         if (!nfs4_sequence_done(task, &data->res.seq_res))
3326                 return -EAGAIN;
3327         return data->write_done_cb(task, data);
3328 }
3329
3330 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3331 {
3332         struct nfs_server *server = NFS_SERVER(data->inode);
3333
3334         if (data->lseg) {
3335                 data->args.bitmask = NULL;
3336                 data->res.fattr = NULL;
3337         } else
3338                 data->args.bitmask = server->cache_consistency_bitmask;
3339         if (!data->write_done_cb)
3340                 data->write_done_cb = nfs4_commit_done_cb;
3341         data->res.server = server;
3342         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3343 }
3344
3345 struct nfs4_renewdata {
3346         struct nfs_client       *client;
3347         unsigned long           timestamp;
3348 };
3349
3350 /*
3351  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3352  * standalone procedure for queueing an asynchronous RENEW.
3353  */
3354 static void nfs4_renew_release(void *calldata)
3355 {
3356         struct nfs4_renewdata *data = calldata;
3357         struct nfs_client *clp = data->client;
3358
3359         if (atomic_read(&clp->cl_count) > 1)
3360                 nfs4_schedule_state_renewal(clp);
3361         nfs_put_client(clp);
3362         kfree(data);
3363 }
3364
3365 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3366 {
3367         struct nfs4_renewdata *data = calldata;
3368         struct nfs_client *clp = data->client;
3369         unsigned long timestamp = data->timestamp;
3370
3371         if (task->tk_status < 0) {
3372                 /* Unless we're shutting down, schedule state recovery! */
3373                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3374                         return;
3375                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3376                         nfs4_schedule_lease_recovery(clp);
3377                         return;
3378                 }
3379                 nfs4_schedule_path_down_recovery(clp);
3380         }
3381         do_renew_lease(clp, timestamp);
3382 }
3383
3384 static const struct rpc_call_ops nfs4_renew_ops = {
3385         .rpc_call_done = nfs4_renew_done,
3386         .rpc_release = nfs4_renew_release,
3387 };
3388
3389 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3390 {
3391         struct rpc_message msg = {
3392                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3393                 .rpc_argp       = clp,
3394                 .rpc_cred       = cred,
3395         };
3396         struct nfs4_renewdata *data;
3397
3398         if (renew_flags == 0)
3399                 return 0;
3400         if (!atomic_inc_not_zero(&clp->cl_count))
3401                 return -EIO;
3402         data = kmalloc(sizeof(*data), GFP_NOFS);
3403         if (data == NULL)
3404                 return -ENOMEM;
3405         data->client = clp;
3406         data->timestamp = jiffies;
3407         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3408                         &nfs4_renew_ops, data);
3409 }
3410
3411 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3412 {
3413         struct rpc_message msg = {
3414                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3415                 .rpc_argp       = clp,
3416                 .rpc_cred       = cred,
3417         };
3418         unsigned long now = jiffies;
3419         int status;
3420
3421         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3422         if (status < 0)
3423                 return status;
3424         do_renew_lease(clp, now);
3425         return 0;
3426 }
3427
3428 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3429 {
3430         return (server->caps & NFS_CAP_ACLS)
3431                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3432                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3433 }
3434
3435 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3436  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3437  * the stack.
3438  */
3439 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3440
3441 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3442                 struct page **pages, unsigned int *pgbase)
3443 {
3444         struct page *newpage, **spages;
3445         int rc = 0;
3446         size_t len;
3447         spages = pages;
3448
3449         do {
3450                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3451                 newpage = alloc_page(GFP_KERNEL);
3452
3453                 if (newpage == NULL)
3454                         goto unwind;
3455                 memcpy(page_address(newpage), buf, len);
3456                 buf += len;
3457                 buflen -= len;
3458                 *pages++ = newpage;
3459                 rc++;
3460         } while (buflen != 0);
3461
3462         return rc;
3463
3464 unwind:
3465         for(; rc > 0; rc--)
3466                 __free_page(spages[rc-1]);
3467         return -ENOMEM;
3468 }
3469
3470 struct nfs4_cached_acl {
3471         int cached;
3472         size_t len;
3473         char data[0];
3474 };
3475
3476 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3477 {
3478         struct nfs_inode *nfsi = NFS_I(inode);
3479
3480         spin_lock(&inode->i_lock);
3481         kfree(nfsi->nfs4_acl);
3482         nfsi->nfs4_acl = acl;
3483         spin_unlock(&inode->i_lock);
3484 }
3485
3486 static void nfs4_zap_acl_attr(struct inode *inode)
3487 {
3488         nfs4_set_cached_acl(inode, NULL);
3489 }
3490
3491 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3492 {
3493         struct nfs_inode *nfsi = NFS_I(inode);
3494         struct nfs4_cached_acl *acl;
3495         int ret = -ENOENT;
3496
3497         spin_lock(&inode->i_lock);
3498         acl = nfsi->nfs4_acl;
3499         if (acl == NULL)
3500                 goto out;
3501         if (buf == NULL) /* user is just asking for length */
3502                 goto out_len;
3503         if (acl->cached == 0)
3504                 goto out;
3505         ret = -ERANGE; /* see getxattr(2) man page */
3506         if (acl->len > buflen)
3507                 goto out;
3508         memcpy(buf, acl->data, acl->len);
3509 out_len:
3510         ret = acl->len;
3511 out:
3512         spin_unlock(&inode->i_lock);
3513         return ret;
3514 }
3515
3516 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3517 {
3518         struct nfs4_cached_acl *acl;
3519
3520         if (buf && acl_len <= PAGE_SIZE) {
3521                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3522                 if (acl == NULL)
3523                         goto out;
3524                 acl->cached = 1;
3525                 memcpy(acl->data, buf, acl_len);
3526         } else {
3527                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3528                 if (acl == NULL)
3529                         goto out;
3530                 acl->cached = 0;
3531         }
3532         acl->len = acl_len;
3533 out:
3534         nfs4_set_cached_acl(inode, acl);
3535 }
3536
3537 /*
3538  * The getxattr API returns the required buffer length when called with a
3539  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3540  * the required buf.  On a NULL buf, we send a page of data to the server
3541  * guessing that the ACL request can be serviced by a page. If so, we cache
3542  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3543  * the cache. If not so, we throw away the page, and cache the required
3544  * length. The next getxattr call will then produce another round trip to
3545  * the server, this time with the input buf of the required size.
3546  */
3547 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3548 {
3549         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3550         struct nfs_getaclargs args = {
3551                 .fh = NFS_FH(inode),
3552                 .acl_pages = pages,
3553                 .acl_len = buflen,
3554         };
3555         struct nfs_getaclres res = {
3556                 .acl_len = buflen,
3557         };
3558         void *resp_buf;
3559         struct rpc_message msg = {
3560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3561                 .rpc_argp = &args,
3562                 .rpc_resp = &res,
3563         };
3564         int ret = -ENOMEM, npages, i, acl_len = 0;
3565
3566         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3567         /* As long as we're doing a round trip to the server anyway,
3568          * let's be prepared for a page of acl data. */
3569         if (npages == 0)
3570                 npages = 1;
3571
3572         for (i = 0; i < npages; i++) {
3573                 pages[i] = alloc_page(GFP_KERNEL);
3574                 if (!pages[i])
3575                         goto out_free;
3576         }
3577         if (npages > 1) {
3578                 /* for decoding across pages */
3579                 args.acl_scratch = alloc_page(GFP_KERNEL);
3580                 if (!args.acl_scratch)
3581                         goto out_free;
3582         }
3583         args.acl_len = npages * PAGE_SIZE;
3584         args.acl_pgbase = 0;
3585         /* Let decode_getfacl know not to fail if the ACL data is larger than
3586          * the page we send as a guess */
3587         if (buf == NULL)
3588                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3589         resp_buf = page_address(pages[0]);
3590
3591         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3592                 __func__, buf, buflen, npages, args.acl_len);
3593         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3594                              &msg, &args.seq_args, &res.seq_res, 0);
3595         if (ret)
3596                 goto out_free;
3597
3598         acl_len = res.acl_len - res.acl_data_offset;
3599         if (acl_len > args.acl_len)
3600                 nfs4_write_cached_acl(inode, NULL, acl_len);
3601         else
3602                 nfs4_write_cached_acl(inode, resp_buf + res.acl_data_offset,
3603                                       acl_len);
3604         if (buf) {
3605                 ret = -ERANGE;
3606                 if (acl_len > buflen)
3607                         goto out_free;
3608                 _copy_from_pages(buf, pages, res.acl_data_offset,
3609                                 res.acl_len);
3610         }
3611         ret = acl_len;
3612 out_free:
3613         for (i = 0; i < npages; i++)
3614                 if (pages[i])
3615                         __free_page(pages[i]);
3616         if (args.acl_scratch)
3617                 __free_page(args.acl_scratch);
3618         return ret;
3619 }
3620
3621 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3622 {
3623         struct nfs4_exception exception = { };
3624         ssize_t ret;
3625         do {
3626                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3627                 if (ret >= 0)
3628                         break;
3629                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3630         } while (exception.retry);
3631         return ret;
3632 }
3633
3634 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3635 {
3636         struct nfs_server *server = NFS_SERVER(inode);
3637         int ret;
3638
3639         if (!nfs4_server_supports_acls(server))
3640                 return -EOPNOTSUPP;
3641         ret = nfs_revalidate_inode(server, inode);
3642         if (ret < 0)
3643                 return ret;
3644         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3645                 nfs_zap_acl_cache(inode);
3646         ret = nfs4_read_cached_acl(inode, buf, buflen);
3647         if (ret != -ENOENT)
3648                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3649                  * but no cached acl data, just the acl length */
3650                 return ret;
3651         return nfs4_get_acl_uncached(inode, buf, buflen);
3652 }
3653
3654 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3655 {
3656         struct nfs_server *server = NFS_SERVER(inode);
3657         struct page *pages[NFS4ACL_MAXPAGES];
3658         struct nfs_setaclargs arg = {
3659                 .fh             = NFS_FH(inode),
3660                 .acl_pages      = pages,
3661                 .acl_len        = buflen,
3662         };
3663         struct nfs_setaclres res;
3664         struct rpc_message msg = {
3665                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3666                 .rpc_argp       = &arg,
3667                 .rpc_resp       = &res,
3668         };
3669         int ret, i;
3670
3671         if (!nfs4_server_supports_acls(server))
3672                 return -EOPNOTSUPP;
3673         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3674         if (i < 0)
3675                 return i;
3676         nfs_inode_return_delegation(inode);
3677         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3678
3679         /*
3680          * Free each page after tx, so the only ref left is
3681          * held by the network stack
3682          */
3683         for (; i > 0; i--)
3684                 put_page(pages[i-1]);
3685
3686         /*
3687          * Acl update can result in inode attribute update.
3688          * so mark the attribute cache invalid.
3689          */
3690         spin_lock(&inode->i_lock);
3691         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3692         spin_unlock(&inode->i_lock);
3693         nfs_access_zap_cache(inode);
3694         nfs_zap_acl_cache(inode);
3695         return ret;
3696 }
3697
3698 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3699 {
3700         struct nfs4_exception exception = { };
3701         int err;
3702         do {
3703                 err = nfs4_handle_exception(NFS_SERVER(inode),
3704                                 __nfs4_proc_set_acl(inode, buf, buflen),
3705                                 &exception);
3706         } while (exception.retry);
3707         return err;
3708 }
3709
3710 static int
3711 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3712 {
3713         struct nfs_client *clp = server->nfs_client;
3714
3715         if (task->tk_status >= 0)
3716                 return 0;
3717         switch(task->tk_status) {
3718                 case -NFS4ERR_ADMIN_REVOKED:
3719                 case -NFS4ERR_BAD_STATEID:
3720                 case -NFS4ERR_OPENMODE:
3721                         if (state == NULL)
3722                                 break;
3723                         nfs4_schedule_stateid_recovery(server, state);
3724                         goto wait_on_recovery;
3725                 case -NFS4ERR_EXPIRED:
3726                         if (state != NULL)
3727                                 nfs4_schedule_stateid_recovery(server, state);
3728                 case -NFS4ERR_STALE_STATEID:
3729                 case -NFS4ERR_STALE_CLIENTID:
3730                         nfs4_schedule_lease_recovery(clp);
3731                         goto wait_on_recovery;
3732 #if defined(CONFIG_NFS_V4_1)
3733                 case -NFS4ERR_BADSESSION:
3734                 case -NFS4ERR_BADSLOT:
3735                 case -NFS4ERR_BAD_HIGH_SLOT:
3736                 case -NFS4ERR_DEADSESSION:
3737                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3738                 case -NFS4ERR_SEQ_FALSE_RETRY:
3739                 case -NFS4ERR_SEQ_MISORDERED:
3740                         dprintk("%s ERROR %d, Reset session\n", __func__,
3741                                 task->tk_status);
3742                         nfs4_schedule_session_recovery(clp->cl_session);
3743                         task->tk_status = 0;
3744                         return -EAGAIN;
3745 #endif /* CONFIG_NFS_V4_1 */
3746                 case -NFS4ERR_DELAY:
3747                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3748                 case -NFS4ERR_GRACE:
3749                 case -EKEYEXPIRED:
3750                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3751                         task->tk_status = 0;
3752                         return -EAGAIN;
3753                 case -NFS4ERR_RETRY_UNCACHED_REP:
3754                 case -NFS4ERR_OLD_STATEID:
3755                         task->tk_status = 0;
3756                         return -EAGAIN;
3757         }
3758         task->tk_status = nfs4_map_errors(task->tk_status);
3759         return 0;
3760 wait_on_recovery:
3761         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3762         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3763                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3764         task->tk_status = 0;
3765         return -EAGAIN;
3766 }
3767
3768 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3769                 unsigned short port, struct rpc_cred *cred,
3770                 struct nfs4_setclientid_res *res)
3771 {
3772         nfs4_verifier sc_verifier;
3773         struct nfs4_setclientid setclientid = {
3774                 .sc_verifier = &sc_verifier,
3775                 .sc_prog = program,
3776                 .sc_cb_ident = clp->cl_cb_ident,
3777         };
3778         struct rpc_message msg = {
3779                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3780                 .rpc_argp = &setclientid,
3781                 .rpc_resp = res,
3782                 .rpc_cred = cred,
3783         };
3784         __be32 *p;
3785         int loop = 0;
3786         int status;
3787
3788         p = (__be32*)sc_verifier.data;
3789         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3790         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3791
3792         for(;;) {
3793                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3794                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3795                                 clp->cl_ipaddr,
3796                                 rpc_peeraddr2str(clp->cl_rpcclient,
3797                                                         RPC_DISPLAY_ADDR),
3798                                 rpc_peeraddr2str(clp->cl_rpcclient,
3799                                                         RPC_DISPLAY_PROTO),
3800                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3801                                 clp->cl_id_uniquifier);
3802                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3803                                 sizeof(setclientid.sc_netid),
3804                                 rpc_peeraddr2str(clp->cl_rpcclient,
3805                                                         RPC_DISPLAY_NETID));
3806                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3807                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3808                                 clp->cl_ipaddr, port >> 8, port & 255);
3809
3810                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3811                 if (status != -NFS4ERR_CLID_INUSE)
3812                         break;
3813                 if (loop != 0) {
3814                         ++clp->cl_id_uniquifier;
3815                         break;
3816                 }
3817                 ++loop;
3818                 ssleep(clp->cl_lease_time / HZ + 1);
3819         }
3820         return status;
3821 }
3822
3823 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3824                 struct nfs4_setclientid_res *arg,
3825                 struct rpc_cred *cred)
3826 {
3827         struct nfs_fsinfo fsinfo;
3828         struct rpc_message msg = {
3829                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3830                 .rpc_argp = arg,
3831                 .rpc_resp = &fsinfo,
3832                 .rpc_cred = cred,
3833         };
3834         unsigned long now;
3835         int status;
3836
3837         now = jiffies;
3838         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3839         if (status == 0) {
3840                 spin_lock(&clp->cl_lock);
3841                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3842                 clp->cl_last_renewal = now;
3843                 spin_unlock(&clp->cl_lock);
3844         }
3845         return status;
3846 }
3847
3848 struct nfs4_delegreturndata {
3849         struct nfs4_delegreturnargs args;
3850         struct nfs4_delegreturnres res;
3851         struct nfs_fh fh;
3852         nfs4_stateid stateid;
3853         unsigned long timestamp;
3854         struct nfs_fattr fattr;
3855         int rpc_status;
3856 };
3857
3858 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3859 {
3860         struct nfs4_delegreturndata *data = calldata;
3861
3862         if (!nfs4_sequence_done(task, &data->res.seq_res))
3863                 return;
3864
3865         switch (task->tk_status) {
3866         case -NFS4ERR_STALE_STATEID:
3867         case -NFS4ERR_EXPIRED:
3868         case 0:
3869                 renew_lease(data->res.server, data->timestamp);
3870                 break;
3871         default:
3872                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3873                                 -EAGAIN) {
3874                         rpc_restart_call_prepare(task);
3875                         return;
3876                 }
3877         }
3878         data->rpc_status = task->tk_status;
3879 }
3880
3881 static void nfs4_delegreturn_release(void *calldata)
3882 {
3883         kfree(calldata);
3884 }
3885
3886 #if defined(CONFIG_NFS_V4_1)
3887 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3888 {
3889         struct nfs4_delegreturndata *d_data;
3890
3891         d_data = (struct nfs4_delegreturndata *)data;
3892
3893         if (nfs4_setup_sequence(d_data->res.server,
3894                                 &d_data->args.seq_args,
3895                                 &d_data->res.seq_res, 1, task))
3896                 return;
3897         rpc_call_start(task);
3898 }
3899 #endif /* CONFIG_NFS_V4_1 */
3900
3901 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3902 #if defined(CONFIG_NFS_V4_1)
3903         .rpc_call_prepare = nfs4_delegreturn_prepare,
3904 #endif /* CONFIG_NFS_V4_1 */
3905         .rpc_call_done = nfs4_delegreturn_done,
3906         .rpc_release = nfs4_delegreturn_release,
3907 };
3908
3909 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3910 {
3911         struct nfs4_delegreturndata *data;
3912         struct nfs_server *server = NFS_SERVER(inode);
3913         struct rpc_task *task;
3914         struct rpc_message msg = {
3915                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3916                 .rpc_cred = cred,
3917         };
3918         struct rpc_task_setup task_setup_data = {
3919                 .rpc_client = server->client,
3920                 .rpc_message = &msg,
3921                 .callback_ops = &nfs4_delegreturn_ops,
3922                 .flags = RPC_TASK_ASYNC,
3923         };
3924         int status = 0;
3925
3926         data = kzalloc(sizeof(*data), GFP_NOFS);
3927         if (data == NULL)
3928                 return -ENOMEM;
3929         data->args.fhandle = &data->fh;
3930         data->args.stateid = &data->stateid;
3931         data->args.bitmask = server->attr_bitmask;
3932         nfs_copy_fh(&data->fh, NFS_FH(inode));
3933         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3934         data->res.fattr = &data->fattr;
3935         data->res.server = server;
3936         nfs_fattr_init(data->res.fattr);
3937         data->timestamp = jiffies;
3938         data->rpc_status = 0;
3939
3940         task_setup_data.callback_data = data;
3941         msg.rpc_argp = &data->args;
3942         msg.rpc_resp = &data->res;
3943         task = rpc_run_task(&task_setup_data);
3944         if (IS_ERR(task))
3945                 return PTR_ERR(task);
3946         if (!issync)
3947                 goto out;
3948         status = nfs4_wait_for_completion_rpc_task(task);
3949         if (status != 0)
3950                 goto out;
3951         status = data->rpc_status;
3952         if (status != 0)
3953                 goto out;
3954         nfs_refresh_inode(inode, &data->fattr);
3955 out:
3956         rpc_put_task(task);
3957         return status;
3958 }
3959
3960 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3961 {
3962         struct nfs_server *server = NFS_SERVER(inode);
3963         struct nfs4_exception exception = { };
3964         int err;
3965         do {
3966                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3967                 switch (err) {
3968                         case -NFS4ERR_STALE_STATEID:
3969                         case -NFS4ERR_EXPIRED:
3970                         case 0:
3971                                 return 0;
3972                 }
3973                 err = nfs4_handle_exception(server, err, &exception);
3974         } while (exception.retry);
3975         return err;
3976 }
3977
3978 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3979 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3980
3981 /*
3982  * sleep, with exponential backoff, and retry the LOCK operation.
3983  */
3984 static unsigned long
3985 nfs4_set_lock_task_retry(unsigned long timeout)
3986 {
3987         freezable_schedule_timeout_killable(timeout);
3988         timeout <<= 1;
3989         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3990                 return NFS4_LOCK_MAXTIMEOUT;
3991         return timeout;
3992 }
3993
3994 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3995 {
3996         struct inode *inode = state->inode;
3997         struct nfs_server *server = NFS_SERVER(inode);
3998         struct nfs_client *clp = server->nfs_client;
3999         struct nfs_lockt_args arg = {
4000                 .fh = NFS_FH(inode),
4001                 .fl = request,
4002         };
4003         struct nfs_lockt_res res = {
4004                 .denied = request,
4005         };
4006         struct rpc_message msg = {
4007                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4008                 .rpc_argp       = &arg,
4009                 .rpc_resp       = &res,
4010                 .rpc_cred       = state->owner->so_cred,
4011         };
4012         struct nfs4_lock_state *lsp;
4013         int status;
4014
4015         arg.lock_owner.clientid = clp->cl_clientid;
4016         status = nfs4_set_lock_state(state, request);
4017         if (status != 0)
4018                 goto out;
4019         lsp = request->fl_u.nfs4_fl.owner;
4020         arg.lock_owner.id = lsp->ls_id.id;
4021         arg.lock_owner.s_dev = server->s_dev;
4022         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4023         switch (status) {
4024                 case 0:
4025                         request->fl_type = F_UNLCK;
4026                         break;
4027                 case -NFS4ERR_DENIED:
4028                         status = 0;
4029         }
4030         request->fl_ops->fl_release_private(request);
4031 out:
4032         return status;
4033 }
4034
4035 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4036 {
4037         struct nfs4_exception exception = { };
4038         int err;
4039
4040         do {
4041                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4042                                 _nfs4_proc_getlk(state, cmd, request),
4043                                 &exception);
4044         } while (exception.retry);
4045         return err;
4046 }
4047
4048 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4049 {
4050         int res = 0;
4051         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4052                 case FL_POSIX:
4053                         res = posix_lock_file_wait(file, fl);
4054                         break;
4055                 case FL_FLOCK:
4056                         res = flock_lock_file_wait(file, fl);
4057                         break;
4058                 default:
4059                         BUG();
4060         }
4061         return res;
4062 }
4063
4064 struct nfs4_unlockdata {
4065         struct nfs_locku_args arg;
4066         struct nfs_locku_res res;
4067         struct nfs4_lock_state *lsp;
4068         struct nfs_open_context *ctx;
4069         struct file_lock fl;
4070         const struct nfs_server *server;
4071         unsigned long timestamp;
4072 };
4073
4074 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4075                 struct nfs_open_context *ctx,
4076                 struct nfs4_lock_state *lsp,
4077                 struct nfs_seqid *seqid)
4078 {
4079         struct nfs4_unlockdata *p;
4080         struct inode *inode = lsp->ls_state->inode;
4081
4082         p = kzalloc(sizeof(*p), GFP_NOFS);
4083         if (p == NULL)
4084                 return NULL;
4085         p->arg.fh = NFS_FH(inode);
4086         p->arg.fl = &p->fl;
4087         p->arg.seqid = seqid;
4088         p->res.seqid = seqid;
4089         p->arg.stateid = &lsp->ls_stateid;
4090         p->lsp = lsp;
4091         atomic_inc(&lsp->ls_count);
4092         /* Ensure we don't close file until we're done freeing locks! */
4093         p->ctx = get_nfs_open_context(ctx);
4094         memcpy(&p->fl, fl, sizeof(p->fl));
4095         p->server = NFS_SERVER(inode);
4096         return p;
4097 }
4098
4099 static void nfs4_locku_release_calldata(void *data)
4100 {
4101         struct nfs4_unlockdata *calldata = data;
4102         nfs_free_seqid(calldata->arg.seqid);
4103         nfs4_put_lock_state(calldata->lsp);
4104         put_nfs_open_context(calldata->ctx);
4105         kfree(calldata);
4106 }
4107
4108 static void nfs4_locku_done(struct rpc_task *task, void *data)
4109 {
4110         struct nfs4_unlockdata *calldata = data;
4111
4112         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4113                 return;
4114         switch (task->tk_status) {
4115                 case 0:
4116                         memcpy(calldata->lsp->ls_stateid.data,
4117                                         calldata->res.stateid.data,
4118                                         sizeof(calldata->lsp->ls_stateid.data));
4119                         renew_lease(calldata->server, calldata->timestamp);
4120                         break;
4121                 case -NFS4ERR_BAD_STATEID:
4122                 case -NFS4ERR_OLD_STATEID:
4123                 case -NFS4ERR_STALE_STATEID:
4124                 case -NFS4ERR_EXPIRED:
4125                         break;
4126                 default:
4127                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4128                                 rpc_restart_call_prepare(task);
4129         }
4130 }
4131
4132 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4133 {
4134         struct nfs4_unlockdata *calldata = data;
4135
4136         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4137                 return;
4138         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4139                 /* Note: exit _without_ running nfs4_locku_done */
4140                 task->tk_action = NULL;
4141                 return;
4142         }
4143         calldata->timestamp = jiffies;
4144         if (nfs4_setup_sequence(calldata->server,
4145                                 &calldata->arg.seq_args,
4146                                 &calldata->res.seq_res, 1, task))
4147                 return;
4148         rpc_call_start(task);
4149 }
4150
4151 static const struct rpc_call_ops nfs4_locku_ops = {
4152         .rpc_call_prepare = nfs4_locku_prepare,
4153         .rpc_call_done = nfs4_locku_done,
4154         .rpc_release = nfs4_locku_release_calldata,
4155 };
4156
4157 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4158                 struct nfs_open_context *ctx,
4159                 struct nfs4_lock_state *lsp,
4160                 struct nfs_seqid *seqid)
4161 {
4162         struct nfs4_unlockdata *data;
4163         struct rpc_message msg = {
4164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4165                 .rpc_cred = ctx->cred,
4166         };
4167         struct rpc_task_setup task_setup_data = {
4168                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4169                 .rpc_message = &msg,
4170                 .callback_ops = &nfs4_locku_ops,
4171                 .workqueue = nfsiod_workqueue,
4172                 .flags = RPC_TASK_ASYNC,
4173         };
4174
4175         /* Ensure this is an unlock - when canceling a lock, the
4176          * canceled lock is passed in, and it won't be an unlock.
4177          */
4178         fl->fl_type = F_UNLCK;
4179
4180         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4181         if (data == NULL) {
4182                 nfs_free_seqid(seqid);
4183                 return ERR_PTR(-ENOMEM);
4184         }
4185
4186         msg.rpc_argp = &data->arg;
4187         msg.rpc_resp = &data->res;
4188         task_setup_data.callback_data = data;
4189         return rpc_run_task(&task_setup_data);
4190 }
4191
4192 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4193 {
4194         struct nfs_inode *nfsi = NFS_I(state->inode);
4195         struct nfs_seqid *seqid;
4196         struct nfs4_lock_state *lsp;
4197         struct rpc_task *task;
4198         int status = 0;
4199         unsigned char fl_flags = request->fl_flags;
4200
4201         status = nfs4_set_lock_state(state, request);
4202         /* Unlock _before_ we do the RPC call */
4203         request->fl_flags |= FL_EXISTS;
4204         down_read(&nfsi->rwsem);
4205         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4206                 up_read(&nfsi->rwsem);
4207                 goto out;
4208         }
4209         up_read(&nfsi->rwsem);
4210         if (status != 0)
4211                 goto out;
4212         /* Is this a delegated lock? */
4213         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4214                 goto out;
4215         lsp = request->fl_u.nfs4_fl.owner;
4216         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4217         status = -ENOMEM;
4218         if (seqid == NULL)
4219                 goto out;
4220         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4221         status = PTR_ERR(task);
4222         if (IS_ERR(task))
4223                 goto out;
4224         status = nfs4_wait_for_completion_rpc_task(task);
4225         rpc_put_task(task);
4226 out:
4227         request->fl_flags = fl_flags;
4228         return status;
4229 }
4230
4231 struct nfs4_lockdata {
4232         struct nfs_lock_args arg;
4233         struct nfs_lock_res res;
4234         struct nfs4_lock_state *lsp;
4235         struct nfs_open_context *ctx;
4236         struct file_lock fl;
4237         unsigned long timestamp;
4238         int rpc_status;
4239         int cancelled;
4240         struct nfs_server *server;
4241 };
4242
4243 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4244                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4245                 gfp_t gfp_mask)
4246 {
4247         struct nfs4_lockdata *p;
4248         struct inode *inode = lsp->ls_state->inode;
4249         struct nfs_server *server = NFS_SERVER(inode);
4250
4251         p = kzalloc(sizeof(*p), gfp_mask);
4252         if (p == NULL)
4253                 return NULL;
4254
4255         p->arg.fh = NFS_FH(inode);
4256         p->arg.fl = &p->fl;
4257         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4258         if (p->arg.open_seqid == NULL)
4259                 goto out_free;
4260         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4261         if (p->arg.lock_seqid == NULL)
4262                 goto out_free_seqid;
4263         p->arg.lock_stateid = &lsp->ls_stateid;
4264         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4265         p->arg.lock_owner.id = lsp->ls_id.id;
4266         p->arg.lock_owner.s_dev = server->s_dev;
4267         p->res.lock_seqid = p->arg.lock_seqid;
4268         p->lsp = lsp;
4269         p->server = server;
4270         atomic_inc(&lsp->ls_count);
4271         p->ctx = get_nfs_open_context(ctx);
4272         memcpy(&p->fl, fl, sizeof(p->fl));
4273         return p;
4274 out_free_seqid:
4275         nfs_free_seqid(p->arg.open_seqid);
4276 out_free:
4277         kfree(p);
4278         return NULL;
4279 }
4280
4281 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4282 {
4283         struct nfs4_lockdata *data = calldata;
4284         struct nfs4_state *state = data->lsp->ls_state;
4285
4286         dprintk("%s: begin!\n", __func__);
4287         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4288                 return;
4289         /* Do we need to do an open_to_lock_owner? */
4290         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4291                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4292                         return;
4293                 data->arg.open_stateid = &state->stateid;
4294                 data->arg.new_lock_owner = 1;
4295                 data->res.open_seqid = data->arg.open_seqid;
4296         } else
4297                 data->arg.new_lock_owner = 0;
4298         data->timestamp = jiffies;
4299         if (nfs4_setup_sequence(data->server,
4300                                 &data->arg.seq_args,
4301                                 &data->res.seq_res, 1, task))
4302                 return;
4303         rpc_call_start(task);
4304         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4305 }
4306
4307 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4308 {
4309         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4310         nfs4_lock_prepare(task, calldata);
4311 }
4312
4313 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4314 {
4315         struct nfs4_lockdata *data = calldata;
4316
4317         dprintk("%s: begin!\n", __func__);
4318
4319         if (!nfs4_sequence_done(task, &data->res.seq_res))
4320                 return;
4321
4322         data->rpc_status = task->tk_status;
4323         if (data->arg.new_lock_owner != 0) {
4324                 if (data->rpc_status == 0)
4325                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4326                 else
4327                         goto out;
4328         }
4329         if (data->rpc_status == 0) {
4330                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4331                                         sizeof(data->lsp->ls_stateid.data));
4332                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4333                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4334         }
4335 out:
4336         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4337 }
4338
4339 static void nfs4_lock_release(void *calldata)
4340 {
4341         struct nfs4_lockdata *data = calldata;
4342
4343         dprintk("%s: begin!\n", __func__);
4344         nfs_free_seqid(data->arg.open_seqid);
4345         if (data->cancelled != 0) {
4346                 struct rpc_task *task;
4347                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4348                                 data->arg.lock_seqid);
4349                 if (!IS_ERR(task))
4350                         rpc_put_task_async(task);
4351                 dprintk("%s: cancelling lock!\n", __func__);
4352         } else
4353                 nfs_free_seqid(data->arg.lock_seqid);
4354         nfs4_put_lock_state(data->lsp);
4355         put_nfs_open_context(data->ctx);
4356         kfree(data);
4357         dprintk("%s: done!\n", __func__);
4358 }
4359
4360 static const struct rpc_call_ops nfs4_lock_ops = {
4361         .rpc_call_prepare = nfs4_lock_prepare,
4362         .rpc_call_done = nfs4_lock_done,
4363         .rpc_release = nfs4_lock_release,
4364 };
4365
4366 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4367         .rpc_call_prepare = nfs4_recover_lock_prepare,
4368         .rpc_call_done = nfs4_lock_done,
4369         .rpc_release = nfs4_lock_release,
4370 };
4371
4372 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4373 {
4374         switch (error) {
4375         case -NFS4ERR_ADMIN_REVOKED:
4376         case -NFS4ERR_BAD_STATEID:
4377                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4378                 if (new_lock_owner != 0 ||
4379                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4380                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4381                 break;
4382         case -NFS4ERR_STALE_STATEID:
4383                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4384         case -NFS4ERR_EXPIRED:
4385                 nfs4_schedule_lease_recovery(server->nfs_client);
4386         };
4387 }
4388
4389 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4390 {
4391         struct nfs4_lockdata *data;
4392         struct rpc_task *task;
4393         struct rpc_message msg = {
4394                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4395                 .rpc_cred = state->owner->so_cred,
4396         };
4397         struct rpc_task_setup task_setup_data = {
4398                 .rpc_client = NFS_CLIENT(state->inode),
4399                 .rpc_message = &msg,
4400                 .callback_ops = &nfs4_lock_ops,
4401                 .workqueue = nfsiod_workqueue,
4402                 .flags = RPC_TASK_ASYNC,
4403         };
4404         int ret;
4405
4406         dprintk("%s: begin!\n", __func__);
4407         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4408                         fl->fl_u.nfs4_fl.owner,
4409                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4410         if (data == NULL)
4411                 return -ENOMEM;
4412         if (IS_SETLKW(cmd))
4413                 data->arg.block = 1;
4414         if (recovery_type > NFS_LOCK_NEW) {
4415                 if (recovery_type == NFS_LOCK_RECLAIM)
4416                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4417                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4418         }
4419         msg.rpc_argp = &data->arg;
4420         msg.rpc_resp = &data->res;
4421         task_setup_data.callback_data = data;
4422         task = rpc_run_task(&task_setup_data);
4423         if (IS_ERR(task))
4424                 return PTR_ERR(task);
4425         ret = nfs4_wait_for_completion_rpc_task(task);
4426         if (ret == 0) {
4427                 ret = data->rpc_status;
4428                 if (ret)
4429                         nfs4_handle_setlk_error(data->server, data->lsp,
4430                                         data->arg.new_lock_owner, ret);
4431         } else
4432                 data->cancelled = 1;
4433         rpc_put_task(task);
4434         dprintk("%s: done, ret = %d!\n", __func__, ret);
4435         return ret;
4436 }
4437
4438 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4439 {
4440         struct nfs_server *server = NFS_SERVER(state->inode);
4441         struct nfs4_exception exception = { };
4442         int err;
4443
4444         do {
4445                 /* Cache the lock if possible... */
4446                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4447                         return 0;
4448                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4449                 if (err != -NFS4ERR_DELAY)
4450                         break;
4451                 nfs4_handle_exception(server, err, &exception);
4452         } while (exception.retry);
4453         return err;
4454 }
4455
4456 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4457 {
4458         struct nfs_server *server = NFS_SERVER(state->inode);
4459         struct nfs4_exception exception = { };
4460         int err;
4461
4462         err = nfs4_set_lock_state(state, request);
4463         if (err != 0)
4464                 return err;
4465         do {
4466                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4467                         return 0;
4468                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4469                 switch (err) {
4470                 default:
4471                         goto out;
4472                 case -NFS4ERR_GRACE:
4473                 case -NFS4ERR_DELAY:
4474                         nfs4_handle_exception(server, err, &exception);
4475                         err = 0;
4476                 }
4477         } while (exception.retry);
4478 out:
4479         return err;
4480 }
4481
4482 #if defined(CONFIG_NFS_V4_1)
4483 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4484 {
4485         int status;
4486         struct nfs_server *server = NFS_SERVER(state->inode);
4487
4488         status = nfs41_test_stateid(server, state);
4489         if (status == NFS_OK)
4490                 return 0;
4491         nfs41_free_stateid(server, state);
4492         return nfs4_lock_expired(state, request);
4493 }
4494 #endif
4495
4496 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4497 {
4498         struct nfs_inode *nfsi = NFS_I(state->inode);
4499         unsigned char fl_flags = request->fl_flags;
4500         int status = -ENOLCK;
4501
4502         if ((fl_flags & FL_POSIX) &&
4503                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4504                 goto out;
4505         /* Is this a delegated open? */
4506         status = nfs4_set_lock_state(state, request);
4507         if (status != 0)
4508                 goto out;
4509         request->fl_flags |= FL_ACCESS;
4510         status = do_vfs_lock(request->fl_file, request);
4511         if (status < 0)
4512                 goto out;
4513         down_read(&nfsi->rwsem);
4514         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4515                 /* Yes: cache locks! */
4516                 /* ...but avoid races with delegation recall... */
4517                 request->fl_flags = fl_flags & ~FL_SLEEP;
4518                 status = do_vfs_lock(request->fl_file, request);
4519                 goto out_unlock;
4520         }
4521         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4522         if (status != 0)
4523                 goto out_unlock;
4524         /* Note: we always want to sleep here! */
4525         request->fl_flags = fl_flags | FL_SLEEP;
4526         if (do_vfs_lock(request->fl_file, request) < 0)
4527                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4528 out_unlock:
4529         up_read(&nfsi->rwsem);
4530 out:
4531         request->fl_flags = fl_flags;
4532         return status;
4533 }
4534
4535 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4536 {
4537         struct nfs4_exception exception = { };
4538         int err;
4539
4540         do {
4541                 err = _nfs4_proc_setlk(state, cmd, request);
4542                 if (err == -NFS4ERR_DENIED)
4543                         err = -EAGAIN;
4544                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4545                                 err, &exception);
4546         } while (exception.retry);
4547         return err;
4548 }
4549
4550 static int
4551 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4552 {
4553         struct nfs_open_context *ctx;
4554         struct nfs4_state *state;
4555         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4556         int status;
4557
4558         /* verify open state */
4559         ctx = nfs_file_open_context(filp);
4560         state = ctx->state;
4561
4562         if (request->fl_start < 0 || request->fl_end < 0)
4563                 return -EINVAL;
4564
4565         if (IS_GETLK(cmd)) {
4566                 if (state != NULL)
4567                         return nfs4_proc_getlk(state, F_GETLK, request);
4568                 return 0;
4569         }
4570
4571         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4572                 return -EINVAL;
4573
4574         if (request->fl_type == F_UNLCK) {
4575                 if (state != NULL)
4576                         return nfs4_proc_unlck(state, cmd, request);
4577                 return 0;
4578         }
4579
4580         if (state == NULL)
4581                 return -ENOLCK;
4582         do {
4583                 status = nfs4_proc_setlk(state, cmd, request);
4584                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4585                         break;
4586                 timeout = nfs4_set_lock_task_retry(timeout);
4587                 status = -ERESTARTSYS;
4588                 if (signalled())
4589                         break;
4590         } while(status < 0);
4591         return status;
4592 }
4593
4594 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4595 {
4596         struct nfs_server *server = NFS_SERVER(state->inode);
4597         struct nfs4_exception exception = { };
4598         int err;
4599
4600         err = nfs4_set_lock_state(state, fl);
4601         if (err != 0)
4602                 goto out;
4603         do {
4604                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4605                 switch (err) {
4606                         default:
4607                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4608                                                 __func__, err);
4609                         case 0:
4610                         case -ESTALE:
4611                                 goto out;
4612                         case -NFS4ERR_EXPIRED:
4613                                 nfs4_schedule_stateid_recovery(server, state);
4614                         case -NFS4ERR_STALE_CLIENTID:
4615                         case -NFS4ERR_STALE_STATEID:
4616                                 nfs4_schedule_lease_recovery(server->nfs_client);
4617                                 goto out;
4618                         case -NFS4ERR_BADSESSION:
4619                         case -NFS4ERR_BADSLOT:
4620                         case -NFS4ERR_BAD_HIGH_SLOT:
4621                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4622                         case -NFS4ERR_DEADSESSION:
4623                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4624                                 goto out;
4625                         case -ERESTARTSYS:
4626                                 /*
4627                                  * The show must go on: exit, but mark the
4628                                  * stateid as needing recovery.
4629                                  */
4630                         case -NFS4ERR_ADMIN_REVOKED:
4631                         case -NFS4ERR_BAD_STATEID:
4632                         case -NFS4ERR_OPENMODE:
4633                                 nfs4_schedule_stateid_recovery(server, state);
4634                                 err = 0;
4635                                 goto out;
4636                         case -EKEYEXPIRED:
4637                                 /*
4638                                  * User RPCSEC_GSS context has expired.
4639                                  * We cannot recover this stateid now, so
4640                                  * skip it and allow recovery thread to
4641                                  * proceed.
4642                                  */
4643                                 err = 0;
4644                                 goto out;
4645                         case -ENOMEM:
4646                         case -NFS4ERR_DENIED:
4647                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4648                                 err = 0;
4649                                 goto out;
4650                         case -NFS4ERR_DELAY:
4651                                 break;
4652                 }
4653                 err = nfs4_handle_exception(server, err, &exception);
4654         } while (exception.retry);
4655 out:
4656         return err;
4657 }
4658
4659 static void nfs4_release_lockowner_release(void *calldata)
4660 {
4661         kfree(calldata);
4662 }
4663
4664 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4665         .rpc_release = nfs4_release_lockowner_release,
4666 };
4667
4668 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4669 {
4670         struct nfs_server *server = lsp->ls_state->owner->so_server;
4671         struct nfs_release_lockowner_args *args;
4672         struct rpc_message msg = {
4673                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4674         };
4675
4676         if (server->nfs_client->cl_mvops->minor_version != 0)
4677                 return;
4678         args = kmalloc(sizeof(*args), GFP_NOFS);
4679         if (!args)
4680                 return;
4681         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4682         args->lock_owner.id = lsp->ls_id.id;
4683         args->lock_owner.s_dev = server->s_dev;
4684         msg.rpc_argp = args;
4685         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4686 }
4687
4688 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4689
4690 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4691                                    const void *buf, size_t buflen,
4692                                    int flags, int type)
4693 {
4694         if (strcmp(key, "") != 0)
4695                 return -EINVAL;
4696
4697         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4698 }
4699
4700 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4701                                    void *buf, size_t buflen, int type)
4702 {
4703         if (strcmp(key, "") != 0)
4704                 return -EINVAL;
4705
4706         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4707 }
4708
4709 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4710                                        size_t list_len, const char *name,
4711                                        size_t name_len, int type)
4712 {
4713         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4714
4715         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4716                 return 0;
4717
4718         if (list && len <= list_len)
4719                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4720         return len;
4721 }
4722
4723 /*
4724  * nfs_fhget will use either the mounted_on_fileid or the fileid
4725  */
4726 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4727 {
4728         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4729                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4730               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4731               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4732                 return;
4733
4734         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4735                 NFS_ATTR_FATTR_NLINK;
4736         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4737         fattr->nlink = 2;
4738 }
4739
4740 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4741                 struct nfs4_fs_locations *fs_locations, struct page *page)
4742 {
4743         struct nfs_server *server = NFS_SERVER(dir);
4744         u32 bitmask[2] = {
4745                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4746         };
4747         struct nfs4_fs_locations_arg args = {
4748                 .dir_fh = NFS_FH(dir),
4749                 .name = name,
4750                 .page = page,
4751                 .bitmask = bitmask,
4752         };
4753         struct nfs4_fs_locations_res res = {
4754                 .fs_locations = fs_locations,
4755         };
4756         struct rpc_message msg = {
4757                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4758                 .rpc_argp = &args,
4759                 .rpc_resp = &res,
4760         };
4761         int status;
4762
4763         dprintk("%s: start\n", __func__);
4764
4765         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4766          * is not supported */
4767         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4768                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4769         else
4770                 bitmask[0] |= FATTR4_WORD0_FILEID;
4771
4772         nfs_fattr_init(&fs_locations->fattr);
4773         fs_locations->server = server;
4774         fs_locations->nlocations = 0;
4775         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4776         dprintk("%s: returned status = %d\n", __func__, status);
4777         return status;
4778 }
4779
4780 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4781 {
4782         int status;
4783         struct nfs4_secinfo_arg args = {
4784                 .dir_fh = NFS_FH(dir),
4785                 .name   = name,
4786         };
4787         struct nfs4_secinfo_res res = {
4788                 .flavors     = flavors,
4789         };
4790         struct rpc_message msg = {
4791                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4792                 .rpc_argp = &args,
4793                 .rpc_resp = &res,
4794         };
4795
4796         dprintk("NFS call  secinfo %s\n", name->name);
4797         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4798         dprintk("NFS reply  secinfo: %d\n", status);
4799         return status;
4800 }
4801
4802 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4803 {
4804         struct nfs4_exception exception = { };
4805         int err;
4806         do {
4807                 err = nfs4_handle_exception(NFS_SERVER(dir),
4808                                 _nfs4_proc_secinfo(dir, name, flavors),
4809                                 &exception);
4810         } while (exception.retry);
4811         return err;
4812 }
4813
4814 #ifdef CONFIG_NFS_V4_1
4815 /*
4816  * Check the exchange flags returned by the server for invalid flags, having
4817  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4818  * DS flags set.
4819  */
4820 static int nfs4_check_cl_exchange_flags(u32 flags)
4821 {
4822         if (flags & ~EXCHGID4_FLAG_MASK_R)
4823                 goto out_inval;
4824         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4825             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4826                 goto out_inval;
4827         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4828                 goto out_inval;
4829         return NFS_OK;
4830 out_inval:
4831         return -NFS4ERR_INVAL;
4832 }
4833
4834 static bool
4835 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4836 {
4837         if (a->server_scope_sz == b->server_scope_sz &&
4838             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4839                 return true;
4840
4841         return false;
4842 }
4843
4844 /*
4845  * nfs4_proc_exchange_id()
4846  *
4847  * Since the clientid has expired, all compounds using sessions
4848  * associated with the stale clientid will be returning
4849  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4850  * be in some phase of session reset.
4851  */
4852 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4853 {
4854         nfs4_verifier verifier;
4855         struct nfs41_exchange_id_args args = {
4856                 .client = clp,
4857                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4858         };
4859         struct nfs41_exchange_id_res res = {
4860                 .client = clp,
4861         };
4862         int status;
4863         struct rpc_message msg = {
4864                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4865                 .rpc_argp = &args,
4866                 .rpc_resp = &res,
4867                 .rpc_cred = cred,
4868         };
4869         __be32 *p;
4870
4871         dprintk("--> %s\n", __func__);
4872         BUG_ON(clp == NULL);
4873
4874         p = (u32 *)verifier.data;
4875         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4876         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4877         args.verifier = &verifier;
4878
4879         args.id_len = scnprintf(args.id, sizeof(args.id),
4880                                 "%s/%s.%s/%u",
4881                                 clp->cl_ipaddr,
4882                                 init_utsname()->nodename,
4883                                 init_utsname()->domainname,
4884                                 clp->cl_rpcclient->cl_auth->au_flavor);
4885
4886         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4887         if (unlikely(!res.server_scope))
4888                 return -ENOMEM;
4889
4890         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4891         if (!status)
4892                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4893
4894         if (!status) {
4895                 if (clp->server_scope &&
4896                     !nfs41_same_server_scope(clp->server_scope,
4897                                              res.server_scope)) {
4898                         dprintk("%s: server_scope mismatch detected\n",
4899                                 __func__);
4900                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4901                         kfree(clp->server_scope);
4902                         clp->server_scope = NULL;
4903                 }
4904
4905                 if (!clp->server_scope)
4906                         clp->server_scope = res.server_scope;
4907                 else
4908                         kfree(res.server_scope);
4909         }
4910
4911         dprintk("<-- %s status= %d\n", __func__, status);
4912         return status;
4913 }
4914
4915 struct nfs4_get_lease_time_data {
4916         struct nfs4_get_lease_time_args *args;
4917         struct nfs4_get_lease_time_res *res;
4918         struct nfs_client *clp;
4919 };
4920
4921 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4922                                         void *calldata)
4923 {
4924         int ret;
4925         struct nfs4_get_lease_time_data *data =
4926                         (struct nfs4_get_lease_time_data *)calldata;
4927
4928         dprintk("--> %s\n", __func__);
4929         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4930         /* just setup sequence, do not trigger session recovery
4931            since we're invoked within one */
4932         ret = nfs41_setup_sequence(data->clp->cl_session,
4933                                    &data->args->la_seq_args,
4934                                    &data->res->lr_seq_res, 0, task);
4935
4936         BUG_ON(ret == -EAGAIN);
4937         rpc_call_start(task);
4938         dprintk("<-- %s\n", __func__);
4939 }
4940
4941 /*
4942  * Called from nfs4_state_manager thread for session setup, so don't recover
4943  * from sequence operation or clientid errors.
4944  */
4945 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4946 {
4947         struct nfs4_get_lease_time_data *data =
4948                         (struct nfs4_get_lease_time_data *)calldata;
4949
4950         dprintk("--> %s\n", __func__);
4951         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4952                 return;
4953         switch (task->tk_status) {
4954         case -NFS4ERR_DELAY:
4955         case -NFS4ERR_GRACE:
4956                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4957                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4958                 task->tk_status = 0;
4959                 /* fall through */
4960         case -NFS4ERR_RETRY_UNCACHED_REP:
4961                 rpc_restart_call_prepare(task);
4962                 return;
4963         }
4964         dprintk("<-- %s\n", __func__);
4965 }
4966
4967 struct rpc_call_ops nfs4_get_lease_time_ops = {
4968         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4969         .rpc_call_done = nfs4_get_lease_time_done,
4970 };
4971
4972 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4973 {
4974         struct rpc_task *task;
4975         struct nfs4_get_lease_time_args args;
4976         struct nfs4_get_lease_time_res res = {
4977                 .lr_fsinfo = fsinfo,
4978         };
4979         struct nfs4_get_lease_time_data data = {
4980                 .args = &args,
4981                 .res = &res,
4982                 .clp = clp,
4983         };
4984         struct rpc_message msg = {
4985                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4986                 .rpc_argp = &args,
4987                 .rpc_resp = &res,
4988         };
4989         struct rpc_task_setup task_setup = {
4990                 .rpc_client = clp->cl_rpcclient,
4991                 .rpc_message = &msg,
4992                 .callback_ops = &nfs4_get_lease_time_ops,
4993                 .callback_data = &data,
4994                 .flags = RPC_TASK_TIMEOUT,
4995         };
4996         int status;
4997
4998         dprintk("--> %s\n", __func__);
4999         task = rpc_run_task(&task_setup);
5000
5001         if (IS_ERR(task))
5002                 status = PTR_ERR(task);
5003         else {
5004                 status = task->tk_status;
5005                 rpc_put_task(task);
5006         }
5007         dprintk("<-- %s return %d\n", __func__, status);
5008
5009         return status;
5010 }
5011
5012 /*
5013  * Reset a slot table
5014  */
5015 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5016                                  int ivalue)
5017 {
5018         struct nfs4_slot *new = NULL;
5019         int i;
5020         int ret = 0;
5021
5022         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5023                 max_reqs, tbl->max_slots);
5024
5025         /* Does the newly negotiated max_reqs match the existing slot table? */
5026         if (max_reqs != tbl->max_slots) {
5027                 ret = -ENOMEM;
5028                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5029                               GFP_NOFS);
5030                 if (!new)
5031                         goto out;
5032                 ret = 0;
5033                 kfree(tbl->slots);
5034         }
5035         spin_lock(&tbl->slot_tbl_lock);
5036         if (new) {
5037                 tbl->slots = new;
5038                 tbl->max_slots = max_reqs;
5039         }
5040         for (i = 0; i < tbl->max_slots; ++i)
5041                 tbl->slots[i].seq_nr = ivalue;
5042         spin_unlock(&tbl->slot_tbl_lock);
5043         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5044                 tbl, tbl->slots, tbl->max_slots);
5045 out:
5046         dprintk("<-- %s: return %d\n", __func__, ret);
5047         return ret;
5048 }
5049
5050 /* Destroy the slot table */
5051 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5052 {
5053         if (session->fc_slot_table.slots != NULL) {
5054                 kfree(session->fc_slot_table.slots);
5055                 session->fc_slot_table.slots = NULL;
5056         }
5057         if (session->bc_slot_table.slots != NULL) {
5058                 kfree(session->bc_slot_table.slots);
5059                 session->bc_slot_table.slots = NULL;
5060         }
5061         return;
5062 }
5063
5064 /*
5065  * Initialize slot table
5066  */
5067 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5068                 int max_slots, int ivalue)
5069 {
5070         struct nfs4_slot *slot;
5071         int ret = -ENOMEM;
5072
5073         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5074
5075         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5076
5077         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5078         if (!slot)
5079                 goto out;
5080         ret = 0;
5081
5082         spin_lock(&tbl->slot_tbl_lock);
5083         tbl->max_slots = max_slots;
5084         tbl->slots = slot;
5085         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5086         spin_unlock(&tbl->slot_tbl_lock);
5087         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5088                 tbl, tbl->slots, tbl->max_slots);
5089 out:
5090         dprintk("<-- %s: return %d\n", __func__, ret);
5091         return ret;
5092 }
5093
5094 /*
5095  * Initialize or reset the forechannel and backchannel tables
5096  */
5097 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5098 {
5099         struct nfs4_slot_table *tbl;
5100         int status;
5101
5102         dprintk("--> %s\n", __func__);
5103         /* Fore channel */
5104         tbl = &ses->fc_slot_table;
5105         if (tbl->slots == NULL) {
5106                 status = nfs4_init_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5107                 if (status) /* -ENOMEM */
5108                         return status;
5109         } else {
5110                 status = nfs4_reset_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5111                 if (status)
5112                         return status;
5113         }
5114         /* Back channel */
5115         tbl = &ses->bc_slot_table;
5116         if (tbl->slots == NULL) {
5117                 status = nfs4_init_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5118                 if (status)
5119                         /* Fore and back channel share a connection so get
5120                          * both slot tables or neither */
5121                         nfs4_destroy_slot_tables(ses);
5122         } else
5123                 status = nfs4_reset_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5124         return status;
5125 }
5126
5127 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5128 {
5129         struct nfs4_session *session;
5130         struct nfs4_slot_table *tbl;
5131
5132         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5133         if (!session)
5134                 return NULL;
5135
5136         tbl = &session->fc_slot_table;
5137         tbl->highest_used_slotid = -1;
5138         spin_lock_init(&tbl->slot_tbl_lock);
5139         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5140         init_completion(&tbl->complete);
5141
5142         tbl = &session->bc_slot_table;
5143         tbl->highest_used_slotid = -1;
5144         spin_lock_init(&tbl->slot_tbl_lock);
5145         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5146         init_completion(&tbl->complete);
5147
5148         session->session_state = 1<<NFS4_SESSION_INITING;
5149
5150         session->clp = clp;
5151         return session;
5152 }
5153
5154 void nfs4_destroy_session(struct nfs4_session *session)
5155 {
5156         nfs4_proc_destroy_session(session);
5157         dprintk("%s Destroy backchannel for xprt %p\n",
5158                 __func__, session->clp->cl_rpcclient->cl_xprt);
5159         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5160                                 NFS41_BC_MIN_CALLBACKS);
5161         nfs4_destroy_slot_tables(session);
5162         kfree(session);
5163 }
5164
5165 /*
5166  * Initialize the values to be used by the client in CREATE_SESSION
5167  * If nfs4_init_session set the fore channel request and response sizes,
5168  * use them.
5169  *
5170  * Set the back channel max_resp_sz_cached to zero to force the client to
5171  * always set csa_cachethis to FALSE because the current implementation
5172  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5173  */
5174 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5175 {
5176         struct nfs4_session *session = args->client->cl_session;
5177         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5178                      mxresp_sz = session->fc_attrs.max_resp_sz;
5179
5180         if (mxrqst_sz == 0)
5181                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5182         if (mxresp_sz == 0)
5183                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5184         /* Fore channel attributes */
5185         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5186         args->fc_attrs.max_resp_sz = mxresp_sz;
5187         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5188         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5189
5190         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5191                 "max_ops=%u max_reqs=%u\n",
5192                 __func__,
5193                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5194                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5195
5196         /* Back channel attributes */
5197         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5198         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5199         args->bc_attrs.max_resp_sz_cached = 0;
5200         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5201         args->bc_attrs.max_reqs = 1;
5202
5203         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5204                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5205                 __func__,
5206                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5207                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5208                 args->bc_attrs.max_reqs);
5209 }
5210
5211 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5212 {
5213         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5214         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5215
5216         if (rcvd->max_resp_sz > sent->max_resp_sz)
5217                 return -EINVAL;
5218         /*
5219          * Our requested max_ops is the minimum we need; we're not
5220          * prepared to break up compounds into smaller pieces than that.
5221          * So, no point even trying to continue if the server won't
5222          * cooperate:
5223          */
5224         if (rcvd->max_ops < sent->max_ops)
5225                 return -EINVAL;
5226         if (rcvd->max_reqs == 0)
5227                 return -EINVAL;
5228         return 0;
5229 }
5230
5231 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5232 {
5233         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5234         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5235
5236         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5237                 return -EINVAL;
5238         if (rcvd->max_resp_sz < sent->max_resp_sz)
5239                 return -EINVAL;
5240         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5241                 return -EINVAL;
5242         /* These would render the backchannel useless: */
5243         if (rcvd->max_ops  == 0)
5244                 return -EINVAL;
5245         if (rcvd->max_reqs == 0)
5246                 return -EINVAL;
5247         return 0;
5248 }
5249
5250 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5251                                      struct nfs4_session *session)
5252 {
5253         int ret;
5254
5255         ret = nfs4_verify_fore_channel_attrs(args, session);
5256         if (ret)
5257                 return ret;
5258         return nfs4_verify_back_channel_attrs(args, session);
5259 }
5260
5261 static int _nfs4_proc_create_session(struct nfs_client *clp)
5262 {
5263         struct nfs4_session *session = clp->cl_session;
5264         struct nfs41_create_session_args args = {
5265                 .client = clp,
5266                 .cb_program = NFS4_CALLBACK,
5267         };
5268         struct nfs41_create_session_res res = {
5269                 .client = clp,
5270         };
5271         struct rpc_message msg = {
5272                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5273                 .rpc_argp = &args,
5274                 .rpc_resp = &res,
5275         };
5276         int status;
5277
5278         nfs4_init_channel_attrs(&args);
5279         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5280
5281         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5282
5283         if (!status)
5284                 /* Verify the session's negotiated channel_attrs values */
5285                 status = nfs4_verify_channel_attrs(&args, session);
5286         if (!status) {
5287                 /* Increment the clientid slot sequence id */
5288                 clp->cl_seqid++;
5289         }
5290
5291         return status;
5292 }
5293
5294 /*
5295  * Issues a CREATE_SESSION operation to the server.
5296  * It is the responsibility of the caller to verify the session is
5297  * expired before calling this routine.
5298  */
5299 int nfs4_proc_create_session(struct nfs_client *clp)
5300 {
5301         int status;
5302         unsigned *ptr;
5303         struct nfs4_session *session = clp->cl_session;
5304
5305         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5306
5307         status = _nfs4_proc_create_session(clp);
5308         if (status)
5309                 goto out;
5310
5311         /* Init or reset the session slot tables */
5312         status = nfs4_setup_session_slot_tables(session);
5313         dprintk("slot table setup returned %d\n", status);
5314         if (status)
5315                 goto out;
5316
5317         ptr = (unsigned *)&session->sess_id.data[0];
5318         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5319                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5320 out:
5321         dprintk("<-- %s\n", __func__);
5322         return status;
5323 }
5324
5325 /*
5326  * Issue the over-the-wire RPC DESTROY_SESSION.
5327  * The caller must serialize access to this routine.
5328  */
5329 int nfs4_proc_destroy_session(struct nfs4_session *session)
5330 {
5331         int status = 0;
5332         struct rpc_message msg;
5333
5334         dprintk("--> nfs4_proc_destroy_session\n");
5335
5336         /* session is still being setup */
5337         if (session->clp->cl_cons_state != NFS_CS_READY)
5338                 return status;
5339
5340         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5341         msg.rpc_argp = session;
5342         msg.rpc_resp = NULL;
5343         msg.rpc_cred = NULL;
5344         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5345
5346         if (status)
5347                 printk(KERN_WARNING
5348                         "Got error %d from the server on DESTROY_SESSION. "
5349                         "Session has been destroyed regardless...\n", status);
5350
5351         dprintk("<-- nfs4_proc_destroy_session\n");
5352         return status;
5353 }
5354
5355 int nfs4_init_session(struct nfs_server *server)
5356 {
5357         struct nfs_client *clp = server->nfs_client;
5358         struct nfs4_session *session;
5359         unsigned int rsize, wsize;
5360         int ret;
5361
5362         if (!nfs4_has_session(clp))
5363                 return 0;
5364
5365         session = clp->cl_session;
5366         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5367                 return 0;
5368
5369         rsize = server->rsize;
5370         if (rsize == 0)
5371                 rsize = NFS_MAX_FILE_IO_SIZE;
5372         wsize = server->wsize;
5373         if (wsize == 0)
5374                 wsize = NFS_MAX_FILE_IO_SIZE;
5375
5376         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5377         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5378
5379         ret = nfs4_recover_expired_lease(server);
5380         if (!ret)
5381                 ret = nfs4_check_client_ready(clp);
5382         return ret;
5383 }
5384
5385 int nfs4_init_ds_session(struct nfs_client *clp)
5386 {
5387         struct nfs4_session *session = clp->cl_session;
5388         int ret;
5389
5390         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5391                 return 0;
5392
5393         ret = nfs4_client_recover_expired_lease(clp);
5394         if (!ret)
5395                 /* Test for the DS role */
5396                 if (!is_ds_client(clp))
5397                         ret = -ENODEV;
5398         if (!ret)
5399                 ret = nfs4_check_client_ready(clp);
5400         return ret;
5401
5402 }
5403 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5404
5405
5406 /*
5407  * Renew the cl_session lease.
5408  */
5409 struct nfs4_sequence_data {
5410         struct nfs_client *clp;
5411         struct nfs4_sequence_args args;
5412         struct nfs4_sequence_res res;
5413 };
5414
5415 static void nfs41_sequence_release(void *data)
5416 {
5417         struct nfs4_sequence_data *calldata = data;
5418         struct nfs_client *clp = calldata->clp;
5419
5420         if (atomic_read(&clp->cl_count) > 1)
5421                 nfs4_schedule_state_renewal(clp);
5422         nfs_put_client(clp);
5423         kfree(calldata);
5424 }
5425
5426 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5427 {
5428         switch(task->tk_status) {
5429         case -NFS4ERR_DELAY:
5430                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5431                 return -EAGAIN;
5432         default:
5433                 nfs4_schedule_lease_recovery(clp);
5434         }
5435         return 0;
5436 }
5437
5438 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5439 {
5440         struct nfs4_sequence_data *calldata = data;
5441         struct nfs_client *clp = calldata->clp;
5442
5443         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5444                 return;
5445
5446         if (task->tk_status < 0) {
5447                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5448                 if (atomic_read(&clp->cl_count) == 1)
5449                         goto out;
5450
5451                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5452                         rpc_restart_call_prepare(task);
5453                         return;
5454                 }
5455         }
5456         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5457 out:
5458         dprintk("<-- %s\n", __func__);
5459 }
5460
5461 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5462 {
5463         struct nfs4_sequence_data *calldata = data;
5464         struct nfs_client *clp = calldata->clp;
5465         struct nfs4_sequence_args *args;
5466         struct nfs4_sequence_res *res;
5467
5468         args = task->tk_msg.rpc_argp;
5469         res = task->tk_msg.rpc_resp;
5470
5471         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5472                 return;
5473         rpc_call_start(task);
5474 }
5475
5476 static const struct rpc_call_ops nfs41_sequence_ops = {
5477         .rpc_call_done = nfs41_sequence_call_done,
5478         .rpc_call_prepare = nfs41_sequence_prepare,
5479         .rpc_release = nfs41_sequence_release,
5480 };
5481
5482 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5483 {
5484         struct nfs4_sequence_data *calldata;
5485         struct rpc_message msg = {
5486                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5487                 .rpc_cred = cred,
5488         };
5489         struct rpc_task_setup task_setup_data = {
5490                 .rpc_client = clp->cl_rpcclient,
5491                 .rpc_message = &msg,
5492                 .callback_ops = &nfs41_sequence_ops,
5493                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5494         };
5495
5496         if (!atomic_inc_not_zero(&clp->cl_count))
5497                 return ERR_PTR(-EIO);
5498         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5499         if (calldata == NULL) {
5500                 nfs_put_client(clp);
5501                 return ERR_PTR(-ENOMEM);
5502         }
5503         msg.rpc_argp = &calldata->args;
5504         msg.rpc_resp = &calldata->res;
5505         calldata->clp = clp;
5506         task_setup_data.callback_data = calldata;
5507
5508         return rpc_run_task(&task_setup_data);
5509 }
5510
5511 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5512 {
5513         struct rpc_task *task;
5514         int ret = 0;
5515
5516         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5517                 return 0;
5518         task = _nfs41_proc_sequence(clp, cred);
5519         if (IS_ERR(task))
5520                 ret = PTR_ERR(task);
5521         else
5522                 rpc_put_task_async(task);
5523         dprintk("<-- %s status=%d\n", __func__, ret);
5524         return ret;
5525 }
5526
5527 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5528 {
5529         struct rpc_task *task;
5530         int ret;
5531
5532         task = _nfs41_proc_sequence(clp, cred);
5533         if (IS_ERR(task)) {
5534                 ret = PTR_ERR(task);
5535                 goto out;
5536         }
5537         ret = rpc_wait_for_completion_task(task);
5538         if (!ret) {
5539                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5540
5541                 if (task->tk_status == 0)
5542                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5543                 ret = task->tk_status;
5544         }
5545         rpc_put_task(task);
5546 out:
5547         dprintk("<-- %s status=%d\n", __func__, ret);
5548         return ret;
5549 }
5550
5551 struct nfs4_reclaim_complete_data {
5552         struct nfs_client *clp;
5553         struct nfs41_reclaim_complete_args arg;
5554         struct nfs41_reclaim_complete_res res;
5555 };
5556
5557 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5558 {
5559         struct nfs4_reclaim_complete_data *calldata = data;
5560
5561         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5562         if (nfs41_setup_sequence(calldata->clp->cl_session,
5563                                 &calldata->arg.seq_args,
5564                                 &calldata->res.seq_res, 0, task))
5565                 return;
5566
5567         rpc_call_start(task);
5568 }
5569
5570 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5571 {
5572         switch(task->tk_status) {
5573         case 0:
5574         case -NFS4ERR_COMPLETE_ALREADY:
5575         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5576                 break;
5577         case -NFS4ERR_DELAY:
5578                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5579                 /* fall through */
5580         case -NFS4ERR_RETRY_UNCACHED_REP:
5581                 return -EAGAIN;
5582         default:
5583                 nfs4_schedule_lease_recovery(clp);
5584         }
5585         return 0;
5586 }
5587
5588 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5589 {
5590         struct nfs4_reclaim_complete_data *calldata = data;
5591         struct nfs_client *clp = calldata->clp;
5592         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5593
5594         dprintk("--> %s\n", __func__);
5595         if (!nfs41_sequence_done(task, res))
5596                 return;
5597
5598         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5599                 rpc_restart_call_prepare(task);
5600                 return;
5601         }
5602         dprintk("<-- %s\n", __func__);
5603 }
5604
5605 static void nfs4_free_reclaim_complete_data(void *data)
5606 {
5607         struct nfs4_reclaim_complete_data *calldata = data;
5608
5609         kfree(calldata);
5610 }
5611
5612 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5613         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5614         .rpc_call_done = nfs4_reclaim_complete_done,
5615         .rpc_release = nfs4_free_reclaim_complete_data,
5616 };
5617
5618 /*
5619  * Issue a global reclaim complete.
5620  */
5621 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5622 {
5623         struct nfs4_reclaim_complete_data *calldata;
5624         struct rpc_task *task;
5625         struct rpc_message msg = {
5626                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5627         };
5628         struct rpc_task_setup task_setup_data = {
5629                 .rpc_client = clp->cl_rpcclient,
5630                 .rpc_message = &msg,
5631                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5632                 .flags = RPC_TASK_ASYNC,
5633         };
5634         int status = -ENOMEM;
5635
5636         dprintk("--> %s\n", __func__);
5637         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5638         if (calldata == NULL)
5639                 goto out;
5640         calldata->clp = clp;
5641         calldata->arg.one_fs = 0;
5642
5643         msg.rpc_argp = &calldata->arg;
5644         msg.rpc_resp = &calldata->res;
5645         task_setup_data.callback_data = calldata;
5646         task = rpc_run_task(&task_setup_data);
5647         if (IS_ERR(task)) {
5648                 status = PTR_ERR(task);
5649                 goto out;
5650         }
5651         status = nfs4_wait_for_completion_rpc_task(task);
5652         if (status == 0)
5653                 status = task->tk_status;
5654         rpc_put_task(task);
5655         return 0;
5656 out:
5657         dprintk("<-- %s status=%d\n", __func__, status);
5658         return status;
5659 }
5660
5661 static void
5662 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5663 {
5664         struct nfs4_layoutget *lgp = calldata;
5665         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5666
5667         dprintk("--> %s\n", __func__);
5668         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5669          * right now covering the LAYOUTGET we are about to send.
5670          * However, that is not so catastrophic, and there seems
5671          * to be no way to prevent it completely.
5672          */
5673         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5674                                 &lgp->res.seq_res, 0, task))
5675                 return;
5676         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5677                                           NFS_I(lgp->args.inode)->layout,
5678                                           lgp->args.ctx->state)) {
5679                 rpc_exit(task, NFS4_OK);
5680                 return;
5681         }
5682         rpc_call_start(task);
5683 }
5684
5685 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5686 {
5687         struct nfs4_layoutget *lgp = calldata;
5688         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5689
5690         dprintk("--> %s\n", __func__);
5691
5692         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5693                 return;
5694
5695         switch (task->tk_status) {
5696         case 0:
5697                 break;
5698         case -NFS4ERR_LAYOUTTRYLATER:
5699         case -NFS4ERR_RECALLCONFLICT:
5700                 task->tk_status = -NFS4ERR_DELAY;
5701                 /* Fall through */
5702         default:
5703                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5704                         rpc_restart_call_prepare(task);
5705                         return;
5706                 }
5707         }
5708         dprintk("<-- %s\n", __func__);
5709 }
5710
5711 static void nfs4_layoutget_release(void *calldata)
5712 {
5713         struct nfs4_layoutget *lgp = calldata;
5714
5715         dprintk("--> %s\n", __func__);
5716         put_nfs_open_context(lgp->args.ctx);
5717         kfree(calldata);
5718         dprintk("<-- %s\n", __func__);
5719 }
5720
5721 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5722         .rpc_call_prepare = nfs4_layoutget_prepare,
5723         .rpc_call_done = nfs4_layoutget_done,
5724         .rpc_release = nfs4_layoutget_release,
5725 };
5726
5727 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5728 {
5729         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5730         struct rpc_task *task;
5731         struct rpc_message msg = {
5732                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5733                 .rpc_argp = &lgp->args,
5734                 .rpc_resp = &lgp->res,
5735         };
5736         struct rpc_task_setup task_setup_data = {
5737                 .rpc_client = server->client,
5738                 .rpc_message = &msg,
5739                 .callback_ops = &nfs4_layoutget_call_ops,
5740                 .callback_data = lgp,
5741                 .flags = RPC_TASK_ASYNC,
5742         };
5743         int status = 0;
5744
5745         dprintk("--> %s\n", __func__);
5746
5747         lgp->res.layoutp = &lgp->args.layout;
5748         lgp->res.seq_res.sr_slot = NULL;
5749         task = rpc_run_task(&task_setup_data);
5750         if (IS_ERR(task))
5751                 return PTR_ERR(task);
5752         status = nfs4_wait_for_completion_rpc_task(task);
5753         if (status == 0)
5754                 status = task->tk_status;
5755         if (status == 0)
5756                 status = pnfs_layout_process(lgp);
5757         rpc_put_task(task);
5758         dprintk("<-- %s status=%d\n", __func__, status);
5759         return status;
5760 }
5761
5762 static void
5763 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5764 {
5765         struct nfs4_layoutreturn *lrp = calldata;
5766
5767         dprintk("--> %s\n", __func__);
5768         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5769                                 &lrp->res.seq_res, 0, task))
5770                 return;
5771         rpc_call_start(task);
5772 }
5773
5774 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5775 {
5776         struct nfs4_layoutreturn *lrp = calldata;
5777         struct nfs_server *server;
5778         struct pnfs_layout_hdr *lo = lrp->args.layout;
5779
5780         dprintk("--> %s\n", __func__);
5781
5782         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5783                 return;
5784
5785         server = NFS_SERVER(lrp->args.inode);
5786         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5787                 rpc_restart_call_prepare(task);
5788                 return;
5789         }
5790         spin_lock(&lo->plh_inode->i_lock);
5791         if (task->tk_status == 0) {
5792                 if (lrp->res.lrs_present) {
5793                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5794                 } else
5795                         BUG_ON(!list_empty(&lo->plh_segs));
5796         }
5797         lo->plh_block_lgets--;
5798         spin_unlock(&lo->plh_inode->i_lock);
5799         dprintk("<-- %s\n", __func__);
5800 }
5801
5802 static void nfs4_layoutreturn_release(void *calldata)
5803 {
5804         struct nfs4_layoutreturn *lrp = calldata;
5805
5806         dprintk("--> %s\n", __func__);
5807         put_layout_hdr(lrp->args.layout);
5808         kfree(calldata);
5809         dprintk("<-- %s\n", __func__);
5810 }
5811
5812 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5813         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5814         .rpc_call_done = nfs4_layoutreturn_done,
5815         .rpc_release = nfs4_layoutreturn_release,
5816 };
5817
5818 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5819 {
5820         struct rpc_task *task;
5821         struct rpc_message msg = {
5822                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5823                 .rpc_argp = &lrp->args,
5824                 .rpc_resp = &lrp->res,
5825         };
5826         struct rpc_task_setup task_setup_data = {
5827                 .rpc_client = lrp->clp->cl_rpcclient,
5828                 .rpc_message = &msg,
5829                 .callback_ops = &nfs4_layoutreturn_call_ops,
5830                 .callback_data = lrp,
5831         };
5832         int status;
5833
5834         dprintk("--> %s\n", __func__);
5835         task = rpc_run_task(&task_setup_data);
5836         if (IS_ERR(task))
5837                 return PTR_ERR(task);
5838         status = task->tk_status;
5839         dprintk("<-- %s status=%d\n", __func__, status);
5840         rpc_put_task(task);
5841         return status;
5842 }
5843
5844 /*
5845  * Retrieve the list of Data Server devices from the MDS.
5846  */
5847 static int _nfs4_getdevicelist(struct nfs_server *server,
5848                                     const struct nfs_fh *fh,
5849                                     struct pnfs_devicelist *devlist)
5850 {
5851         struct nfs4_getdevicelist_args args = {
5852                 .fh = fh,
5853                 .layoutclass = server->pnfs_curr_ld->id,
5854         };
5855         struct nfs4_getdevicelist_res res = {
5856                 .devlist = devlist,
5857         };
5858         struct rpc_message msg = {
5859                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5860                 .rpc_argp = &args,
5861                 .rpc_resp = &res,
5862         };
5863         int status;
5864
5865         dprintk("--> %s\n", __func__);
5866         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5867                                 &res.seq_res, 0);
5868         dprintk("<-- %s status=%d\n", __func__, status);
5869         return status;
5870 }
5871
5872 int nfs4_proc_getdevicelist(struct nfs_server *server,
5873                             const struct nfs_fh *fh,
5874                             struct pnfs_devicelist *devlist)
5875 {
5876         struct nfs4_exception exception = { };
5877         int err;
5878
5879         do {
5880                 err = nfs4_handle_exception(server,
5881                                 _nfs4_getdevicelist(server, fh, devlist),
5882                                 &exception);
5883         } while (exception.retry);
5884
5885         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5886                 err, devlist->num_devs);
5887
5888         return err;
5889 }
5890 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5891
5892 static int
5893 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5894 {
5895         struct nfs4_getdeviceinfo_args args = {
5896                 .pdev = pdev,
5897         };
5898         struct nfs4_getdeviceinfo_res res = {
5899                 .pdev = pdev,
5900         };
5901         struct rpc_message msg = {
5902                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5903                 .rpc_argp = &args,
5904                 .rpc_resp = &res,
5905         };
5906         int status;
5907
5908         dprintk("--> %s\n", __func__);
5909         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5910         dprintk("<-- %s status=%d\n", __func__, status);
5911
5912         return status;
5913 }
5914
5915 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5916 {
5917         struct nfs4_exception exception = { };
5918         int err;
5919
5920         do {
5921                 err = nfs4_handle_exception(server,
5922                                         _nfs4_proc_getdeviceinfo(server, pdev),
5923                                         &exception);
5924         } while (exception.retry);
5925         return err;
5926 }
5927 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5928
5929 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5930 {
5931         struct nfs4_layoutcommit_data *data = calldata;
5932         struct nfs_server *server = NFS_SERVER(data->args.inode);
5933
5934         if (nfs4_setup_sequence(server, &data->args.seq_args,
5935                                 &data->res.seq_res, 1, task))
5936                 return;
5937         rpc_call_start(task);
5938 }
5939
5940 static void
5941 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5942 {
5943         struct nfs4_layoutcommit_data *data = calldata;
5944         struct nfs_server *server = NFS_SERVER(data->args.inode);
5945
5946         if (!nfs4_sequence_done(task, &data->res.seq_res))
5947                 return;
5948
5949         switch (task->tk_status) { /* Just ignore these failures */
5950         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5951         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5952         case NFS4ERR_BADLAYOUT:     /* no layout */
5953         case NFS4ERR_GRACE:         /* loca_recalim always false */
5954                 task->tk_status = 0;
5955         }
5956
5957         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5958                 rpc_restart_call_prepare(task);
5959                 return;
5960         }
5961
5962         if (task->tk_status == 0)
5963                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5964                                                    data->res.fattr);
5965 }
5966
5967 static void nfs4_layoutcommit_release(void *calldata)
5968 {
5969         struct nfs4_layoutcommit_data *data = calldata;
5970         struct pnfs_layout_segment *lseg, *tmp;
5971         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
5972
5973         pnfs_cleanup_layoutcommit(data);
5974         /* Matched by references in pnfs_set_layoutcommit */
5975         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5976                 list_del_init(&lseg->pls_lc_list);
5977                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
5978                                        &lseg->pls_flags))
5979                         put_lseg(lseg);
5980         }
5981
5982         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
5983         smp_mb__after_clear_bit();
5984         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
5985
5986         put_rpccred(data->cred);
5987         kfree(data);
5988 }
5989
5990 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5991         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5992         .rpc_call_done = nfs4_layoutcommit_done,
5993         .rpc_release = nfs4_layoutcommit_release,
5994 };
5995
5996 int
5997 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5998 {
5999         struct rpc_message msg = {
6000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6001                 .rpc_argp = &data->args,
6002                 .rpc_resp = &data->res,
6003                 .rpc_cred = data->cred,
6004         };
6005         struct rpc_task_setup task_setup_data = {
6006                 .task = &data->task,
6007                 .rpc_client = NFS_CLIENT(data->args.inode),
6008                 .rpc_message = &msg,
6009                 .callback_ops = &nfs4_layoutcommit_ops,
6010                 .callback_data = data,
6011                 .flags = RPC_TASK_ASYNC,
6012         };
6013         struct rpc_task *task;
6014         int status = 0;
6015
6016         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6017                 "lbw: %llu inode %lu\n",
6018                 data->task.tk_pid, sync,
6019                 data->args.lastbytewritten,
6020                 data->args.inode->i_ino);
6021
6022         task = rpc_run_task(&task_setup_data);
6023         if (IS_ERR(task))
6024                 return PTR_ERR(task);
6025         if (sync == false)
6026                 goto out;
6027         status = nfs4_wait_for_completion_rpc_task(task);
6028         if (status != 0)
6029                 goto out;
6030         status = task->tk_status;
6031 out:
6032         dprintk("%s: status %d\n", __func__, status);
6033         rpc_put_task(task);
6034         return status;
6035 }
6036
6037 static int
6038 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6039                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6040 {
6041         struct nfs41_secinfo_no_name_args args = {
6042                 .style = SECINFO_STYLE_CURRENT_FH,
6043         };
6044         struct nfs4_secinfo_res res = {
6045                 .flavors = flavors,
6046         };
6047         struct rpc_message msg = {
6048                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6049                 .rpc_argp = &args,
6050                 .rpc_resp = &res,
6051         };
6052         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6053 }
6054
6055 static int
6056 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6057                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6058 {
6059         struct nfs4_exception exception = { };
6060         int err;
6061         do {
6062                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6063                 switch (err) {
6064                 case 0:
6065                 case -NFS4ERR_WRONGSEC:
6066                 case -NFS4ERR_NOTSUPP:
6067                         break;
6068                 default:
6069                         err = nfs4_handle_exception(server, err, &exception);
6070                 }
6071         } while (exception.retry);
6072         return err;
6073 }
6074
6075 static int
6076 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6077                     struct nfs_fsinfo *info)
6078 {
6079         int err;
6080         struct page *page;
6081         rpc_authflavor_t flavor;
6082         struct nfs4_secinfo_flavors *flavors;
6083
6084         page = alloc_page(GFP_KERNEL);
6085         if (!page) {
6086                 err = -ENOMEM;
6087                 goto out;
6088         }
6089
6090         flavors = page_address(page);
6091         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6092
6093         /*
6094          * Fall back on "guess and check" method if
6095          * the server doesn't support SECINFO_NO_NAME
6096          */
6097         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6098                 err = nfs4_find_root_sec(server, fhandle, info);
6099                 goto out_freepage;
6100         }
6101         if (err)
6102                 goto out_freepage;
6103
6104         flavor = nfs_find_best_sec(flavors);
6105         if (err == 0)
6106                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6107
6108 out_freepage:
6109         put_page(page);
6110         if (err == -EACCES)
6111                 return -EPERM;
6112 out:
6113         return err;
6114 }
6115 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6116 {
6117         int status;
6118         struct nfs41_test_stateid_args args = {
6119                 .stateid = &state->stateid,
6120         };
6121         struct nfs41_test_stateid_res res;
6122         struct rpc_message msg = {
6123                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6124                 .rpc_argp = &args,
6125                 .rpc_resp = &res,
6126         };
6127         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6128         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6129         return status;
6130 }
6131
6132 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6133 {
6134         struct nfs4_exception exception = { };
6135         int err;
6136         do {
6137                 err = nfs4_handle_exception(server,
6138                                 _nfs41_test_stateid(server, state),
6139                                 &exception);
6140         } while (exception.retry);
6141         return err;
6142 }
6143
6144 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6145 {
6146         int status;
6147         struct nfs41_free_stateid_args args = {
6148                 .stateid = &state->stateid,
6149         };
6150         struct nfs41_free_stateid_res res;
6151         struct rpc_message msg = {
6152                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6153                 .rpc_argp = &args,
6154                 .rpc_resp = &res,
6155         };
6156
6157         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6158         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6159         return status;
6160 }
6161
6162 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6163 {
6164         struct nfs4_exception exception = { };
6165         int err;
6166         do {
6167                 err = nfs4_handle_exception(server,
6168                                 _nfs4_free_stateid(server, state),
6169                                 &exception);
6170         } while (exception.retry);
6171         return err;
6172 }
6173 #endif /* CONFIG_NFS_V4_1 */
6174
6175 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6176         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6177         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6178         .recover_open   = nfs4_open_reclaim,
6179         .recover_lock   = nfs4_lock_reclaim,
6180         .establish_clid = nfs4_init_clientid,
6181         .get_clid_cred  = nfs4_get_setclientid_cred,
6182 };
6183
6184 #if defined(CONFIG_NFS_V4_1)
6185 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6186         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6187         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6188         .recover_open   = nfs4_open_reclaim,
6189         .recover_lock   = nfs4_lock_reclaim,
6190         .establish_clid = nfs41_init_clientid,
6191         .get_clid_cred  = nfs4_get_exchange_id_cred,
6192         .reclaim_complete = nfs41_proc_reclaim_complete,
6193 };
6194 #endif /* CONFIG_NFS_V4_1 */
6195
6196 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6197         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6198         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6199         .recover_open   = nfs4_open_expired,
6200         .recover_lock   = nfs4_lock_expired,
6201         .establish_clid = nfs4_init_clientid,
6202         .get_clid_cred  = nfs4_get_setclientid_cred,
6203 };
6204
6205 #if defined(CONFIG_NFS_V4_1)
6206 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6207         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6208         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6209         .recover_open   = nfs41_open_expired,
6210         .recover_lock   = nfs41_lock_expired,
6211         .establish_clid = nfs41_init_clientid,
6212         .get_clid_cred  = nfs4_get_exchange_id_cred,
6213 };
6214 #endif /* CONFIG_NFS_V4_1 */
6215
6216 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6217         .sched_state_renewal = nfs4_proc_async_renew,
6218         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6219         .renew_lease = nfs4_proc_renew,
6220 };
6221
6222 #if defined(CONFIG_NFS_V4_1)
6223 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6224         .sched_state_renewal = nfs41_proc_async_sequence,
6225         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6226         .renew_lease = nfs4_proc_sequence,
6227 };
6228 #endif
6229
6230 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6231         .minor_version = 0,
6232         .call_sync = _nfs4_call_sync,
6233         .validate_stateid = nfs4_validate_delegation_stateid,
6234         .find_root_sec = nfs4_find_root_sec,
6235         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6236         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6237         .state_renewal_ops = &nfs40_state_renewal_ops,
6238 };
6239
6240 #if defined(CONFIG_NFS_V4_1)
6241 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6242         .minor_version = 1,
6243         .call_sync = _nfs4_call_sync_session,
6244         .validate_stateid = nfs41_validate_delegation_stateid,
6245         .find_root_sec = nfs41_find_root_sec,
6246         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6247         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6248         .state_renewal_ops = &nfs41_state_renewal_ops,
6249 };
6250 #endif
6251
6252 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6253         [0] = &nfs_v4_0_minor_ops,
6254 #if defined(CONFIG_NFS_V4_1)
6255         [1] = &nfs_v4_1_minor_ops,
6256 #endif
6257 };
6258
6259 static const struct inode_operations nfs4_file_inode_operations = {
6260         .permission     = nfs_permission,
6261         .getattr        = nfs_getattr,
6262         .setattr        = nfs_setattr,
6263         .getxattr       = generic_getxattr,
6264         .setxattr       = generic_setxattr,
6265         .listxattr      = generic_listxattr,
6266         .removexattr    = generic_removexattr,
6267 };
6268
6269 const struct nfs_rpc_ops nfs_v4_clientops = {
6270         .version        = 4,                    /* protocol version */
6271         .dentry_ops     = &nfs4_dentry_operations,
6272         .dir_inode_ops  = &nfs4_dir_inode_operations,
6273         .file_inode_ops = &nfs4_file_inode_operations,
6274         .file_ops       = &nfs4_file_operations,
6275         .getroot        = nfs4_proc_get_root,
6276         .getattr        = nfs4_proc_getattr,
6277         .setattr        = nfs4_proc_setattr,
6278         .lookup         = nfs4_proc_lookup,
6279         .access         = nfs4_proc_access,
6280         .readlink       = nfs4_proc_readlink,
6281         .create         = nfs4_proc_create,
6282         .remove         = nfs4_proc_remove,
6283         .unlink_setup   = nfs4_proc_unlink_setup,
6284         .unlink_done    = nfs4_proc_unlink_done,
6285         .rename         = nfs4_proc_rename,
6286         .rename_setup   = nfs4_proc_rename_setup,
6287         .rename_done    = nfs4_proc_rename_done,
6288         .link           = nfs4_proc_link,
6289         .symlink        = nfs4_proc_symlink,
6290         .mkdir          = nfs4_proc_mkdir,
6291         .rmdir          = nfs4_proc_remove,
6292         .readdir        = nfs4_proc_readdir,
6293         .mknod          = nfs4_proc_mknod,
6294         .statfs         = nfs4_proc_statfs,
6295         .fsinfo         = nfs4_proc_fsinfo,
6296         .pathconf       = nfs4_proc_pathconf,
6297         .set_capabilities = nfs4_server_capabilities,
6298         .decode_dirent  = nfs4_decode_dirent,
6299         .read_setup     = nfs4_proc_read_setup,
6300         .read_done      = nfs4_read_done,
6301         .write_setup    = nfs4_proc_write_setup,
6302         .write_done     = nfs4_write_done,
6303         .commit_setup   = nfs4_proc_commit_setup,
6304         .commit_done    = nfs4_commit_done,
6305         .lock           = nfs4_proc_lock,
6306         .clear_acl_cache = nfs4_zap_acl_attr,
6307         .close_context  = nfs4_close_context,
6308         .open_context   = nfs4_atomic_open,
6309         .init_client    = nfs4_init_client,
6310         .secinfo        = nfs4_proc_secinfo,
6311 };
6312
6313 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6314         .prefix = XATTR_NAME_NFSV4_ACL,
6315         .list   = nfs4_xattr_list_nfs4_acl,
6316         .get    = nfs4_xattr_get_nfs4_acl,
6317         .set    = nfs4_xattr_set_nfs4_acl,
6318 };
6319
6320 const struct xattr_handler *nfs4_xattr_handlers[] = {
6321         &nfs4_xattr_nfs4_acl_handler,
6322         NULL
6323 };
6324
6325 /*
6326  * Local variables:
6327  *  c-basic-offset: 8
6328  * End:
6329  */