fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/sunrpc/gss_api.h>
  45 #include <linux/nfs.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/nfs_page.h>
  49 #include <linux/nfs_mount.h>
  50 #include <linux/namei.h>
  51 #include <linux/mount.h>
  52 #include <linux/module.h>
  53 #include <linux/sunrpc/bc_xprt.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "delegation.h"
  59 #include "internal.h"
  60 #include "iostat.h"
  61 #include "callback.h"
  62 #include "pnfs.h"
  63
  64 #define NFSDBG_FACILITY         NFSDBG_PROC
  65
  66 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  67 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  68
  69 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  70
  71 struct nfs4_opendata;
  72 static int _nfs4_proc_open(struct nfs4_opendata *data);
  73 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  74 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  75 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  76 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
  77                              const struct qstr *name, struct nfs_fh *fhandle,
  78                              struct nfs_fattr *fattr);
  79 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  80 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  81                             struct nfs_fattr *fattr, struct iattr *sattr,
  82                             struct nfs4_state *state);
  83
  84 /* Prevent leaks of NFSv4 errors into userland */
  85 static int nfs4_map_errors(int err)
  86 {
  87         if (err >= -1000)
  88                 return err;
  89         switch (err) {
  90         case -NFS4ERR_RESOURCE:
  91                 return -EREMOTEIO;
  92         case -NFS4ERR_WRONGSEC:
  93                 return -EPERM;
  94         case -NFS4ERR_BADOWNER:
  95         case -NFS4ERR_BADNAME:
  96                 return -EINVAL;
  97         default:
  98                 dprintk("%s could not handle NFSv4 error %d\n",
  99                                 __func__, -err);
 100                 break;
 101         }
 102         return -EIO;
 103 }
 104
 105 /*
 106  * This is our standard bitmap for GETATTR requests.
 107  */
 108 const u32 nfs4_fattr_bitmap[2] = {
 109         FATTR4_WORD0_TYPE
 110         | FATTR4_WORD0_CHANGE
 111         | FATTR4_WORD0_SIZE
 112         | FATTR4_WORD0_FSID
 113         | FATTR4_WORD0_FILEID,
 114         FATTR4_WORD1_MODE
 115         | FATTR4_WORD1_NUMLINKS
 116         | FATTR4_WORD1_OWNER
 117         | FATTR4_WORD1_OWNER_GROUP
 118         | FATTR4_WORD1_RAWDEV
 119         | FATTR4_WORD1_SPACE_USED
 120         | FATTR4_WORD1_TIME_ACCESS
 121         | FATTR4_WORD1_TIME_METADATA
 122         | FATTR4_WORD1_TIME_MODIFY
 123 };
 124
 125 const u32 nfs4_statfs_bitmap[2] = {
 126         FATTR4_WORD0_FILES_AVAIL
 127         | FATTR4_WORD0_FILES_FREE
 128         | FATTR4_WORD0_FILES_TOTAL,
 129         FATTR4_WORD1_SPACE_AVAIL
 130         | FATTR4_WORD1_SPACE_FREE
 131         | FATTR4_WORD1_SPACE_TOTAL
 132 };
 133
 134 const u32 nfs4_pathconf_bitmap[2] = {
 135         FATTR4_WORD0_MAXLINK
 136         | FATTR4_WORD0_MAXNAME,
 137         0
 138 };
 139
 140 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 141                         | FATTR4_WORD0_MAXREAD
 142                         | FATTR4_WORD0_MAXWRITE
 143                         | FATTR4_WORD0_LEASE_TIME,
 144                         FATTR4_WORD1_TIME_DELTA
 145                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 146 };
 147
 148 const u32 nfs4_fs_locations_bitmap[2] = {
 149         FATTR4_WORD0_TYPE
 150         | FATTR4_WORD0_CHANGE
 151         | FATTR4_WORD0_SIZE
 152         | FATTR4_WORD0_FSID
 153         | FATTR4_WORD0_FILEID
 154         | FATTR4_WORD0_FS_LOCATIONS,
 155         FATTR4_WORD1_MODE
 156         | FATTR4_WORD1_NUMLINKS
 157         | FATTR4_WORD1_OWNER
 158         | FATTR4_WORD1_OWNER_GROUP
 159         | FATTR4_WORD1_RAWDEV
 160         | FATTR4_WORD1_SPACE_USED
 161         | FATTR4_WORD1_TIME_ACCESS
 162         | FATTR4_WORD1_TIME_METADATA
 163         | FATTR4_WORD1_TIME_MODIFY
 164         | FATTR4_WORD1_MOUNTED_ON_FILEID
 165 };
 166
 167 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 168                 struct nfs4_readdir_arg *readdir)
 169 {
 170         __be32 *start, *p;
 171
 172         BUG_ON(readdir->count < 80);
 173         if (cookie > 2) {
 174                 readdir->cookie = cookie;
 175                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 176                 return;
 177         }
 178
 179         readdir->cookie = 0;
 180         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 181         if (cookie == 2)
 182                 return;
 183
 184         /*
 185          * NFSv4 servers do not return entries for '.' and '..'
 186          * Therefore, we fake these entries here.  We let '.'
 187          * have cookie 0 and '..' have cookie 1.  Note that
 188          * when talking to the server, we always send cookie 0
 189          * instead of 1 or 2.
 190          */
 191         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 192
 193         if (cookie == 0) {
 194                 *p++ = xdr_one;                                  /* next */
 195                 *p++ = xdr_zero;                   /* cookie, first word */
 196                 *p++ = xdr_one;                   /* cookie, second word */
 197                 *p++ = xdr_one;                             /* entry len */
 198                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 199                 p++;
 200                 *p++ = xdr_one;                         /* bitmap length */
 201                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 202                 *p++ = htonl(8);              /* attribute buffer length */
 203                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 204         }
 205
 206         *p++ = xdr_one;                                  /* next */
 207         *p++ = xdr_zero;                   /* cookie, first word */
 208         *p++ = xdr_two;                   /* cookie, second word */
 209         *p++ = xdr_two;                             /* entry len */
 210         memcpy(p, "..\0\0", 4);                         /* entry */
 211         p++;
 212         *p++ = xdr_one;                         /* bitmap length */
 213         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 214         *p++ = htonl(8);              /* attribute buffer length */
 215         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 216
 217         readdir->pgbase = (char *)p - (char *)start;
 218         readdir->count -= readdir->pgbase;
 219         kunmap_atomic(start, KM_USER0);
 220 }
 221
 222 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 223 {
 224         int res;
 225
 226         might_sleep();
 227
 228         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 229                         nfs_wait_bit_killable, TASK_KILLABLE);
 230         return res;
 231 }
 232
 233 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 234 {
 235         int res = 0;
 236
 237         might_sleep();
 238
 239         if (*timeout <= 0)
 240                 *timeout = NFS4_POLL_RETRY_MIN;
 241         if (*timeout > NFS4_POLL_RETRY_MAX)
 242                 *timeout = NFS4_POLL_RETRY_MAX;
 243         schedule_timeout_killable(*timeout);
 244         if (fatal_signal_pending(current))
 245                 res = -ERESTARTSYS;
 246         *timeout <<= 1;
 247         return res;
 248 }
 249
 250 /* This is the error handling routine for processes that are allowed
 251  * to sleep.
 252  */
 253 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 254 {
 255         struct nfs_client *clp = server->nfs_client;
 256         struct nfs4_state *state = exception->state;
 257         int ret = errorcode;
 258
 259         exception->retry = 0;
 260         switch(errorcode) {
 261                 case 0:
 262                         return 0;
 263                 case -NFS4ERR_DELEG_REVOKED:
 264                 case -NFS4ERR_ADMIN_REVOKED:
 265                 case -NFS4ERR_BAD_STATEID:
 266                         if (state != NULL)
 267                                 nfs_remove_bad_delegation(state->inode);
 268                 case -NFS4ERR_OPENMODE:
 269                         if (state == NULL)
 270                                 break;
 271                         nfs4_schedule_stateid_recovery(server, state);
 272                         goto wait_on_recovery;
 273                 case -NFS4ERR_EXPIRED:
 274                         if (state != NULL)
 275                                 nfs4_schedule_stateid_recovery(server, state);
 276                 case -NFS4ERR_STALE_STATEID:
 277                 case -NFS4ERR_STALE_CLIENTID:
 278                         nfs4_schedule_lease_recovery(clp);
 279                         goto wait_on_recovery;
 280 #if defined(CONFIG_NFS_V4_1)
 281                 case -NFS4ERR_BADSESSION:
 282                 case -NFS4ERR_BADSLOT:
 283                 case -NFS4ERR_BAD_HIGH_SLOT:
 284                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 285                 case -NFS4ERR_DEADSESSION:
 286                 case -NFS4ERR_SEQ_FALSE_RETRY:
 287                 case -NFS4ERR_SEQ_MISORDERED:
 288                         dprintk("%s ERROR: %d Reset session\n", __func__,
 289                                 errorcode);
 290                         nfs4_schedule_session_recovery(clp->cl_session);
 291                         exception->retry = 1;
 292                         break;
 293 #endif /* defined(CONFIG_NFS_V4_1) */
 294                 case -NFS4ERR_FILE_OPEN:
 295                         if (exception->timeout > HZ) {
 296                                 /* We have retried a decent amount, time to
 297                                  * fail
 298                                  */
 299                                 ret = -EBUSY;
 300                                 break;
 301                         }
 302                 case -NFS4ERR_GRACE:
 303                 case -NFS4ERR_DELAY:
 304                 case -EKEYEXPIRED:
 305                         ret = nfs4_delay(server->client, &exception->timeout);
 306                         if (ret != 0)
 307                                 break;
 308                 case -NFS4ERR_RETRY_UNCACHED_REP:
 309                 case -NFS4ERR_OLD_STATEID:
 310                         exception->retry = 1;
 311                         break;
 312                 case -NFS4ERR_BADOWNER:
 313                         /* The following works around a Linux server bug! */
 314                 case -NFS4ERR_BADNAME:
 315                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 316                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 317                                 exception->retry = 1;
 318                                 printk(KERN_WARNING "NFS: v4 server %s "
 319                                                 "does not accept raw "
 320                                                 "uid/gids. "
 321                                                 "Reenabling the idmapper.\n",
 322                                                 server->nfs_client->cl_hostname);
 323                         }
 324         }
 325         /* We failed to handle the error */
 326         return nfs4_map_errors(ret);
 327 wait_on_recovery:
 328         ret = nfs4_wait_clnt_recover(clp);
 329         if (ret == 0)
 330                 exception->retry = 1;
 331         return ret;
 332 }
 333
 334
 335 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 336 {
 337         spin_lock(&clp->cl_lock);
 338         if (time_before(clp->cl_last_renewal,timestamp))
 339                 clp->cl_last_renewal = timestamp;
 340         spin_unlock(&clp->cl_lock);
 341 }
 342
 343 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 344 {
 345         do_renew_lease(server->nfs_client, timestamp);
 346 }
 347
 348 #if defined(CONFIG_NFS_V4_1)
 349
 350 /*
 351  * nfs4_free_slot - free a slot and efficiently update slot table.
 352  *
 353  * freeing a slot is trivially done by clearing its respective bit
 354  * in the bitmap.
 355  * If the freed slotid equals highest_used_slotid we want to update it
 356  * so that the server would be able to size down the slot table if needed,
 357  * otherwise we know that the highest_used_slotid is still in use.
 358  * When updating highest_used_slotid there may be "holes" in the bitmap
 359  * so we need to scan down from highest_used_slotid to 0 looking for the now
 360  * highest slotid in use.
 361  * If none found, highest_used_slotid is set to -1.
 362  *
 363  * Must be called while holding tbl->slot_tbl_lock
 364  */
 365 static void
 366 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 367 {
 368         int free_slotid = free_slot - tbl->slots;
 369         int slotid = free_slotid;
 370
 371         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 372         /* clear used bit in bitmap */
 373         __clear_bit(slotid, tbl->used_slots);
 374
 375         /* update highest_used_slotid when it is freed */
 376         if (slotid == tbl->highest_used_slotid) {
 377                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 378                 if (slotid < tbl->max_slots)
 379                         tbl->highest_used_slotid = slotid;
 380                 else
 381                         tbl->highest_used_slotid = -1;
 382         }
 383         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 384                 free_slotid, tbl->highest_used_slotid);
 385 }
 386
 387 /*
 388  * Signal state manager thread if session fore channel is drained
 389  */
 390 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 391 {
 392         struct rpc_task *task;
 393
 394         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 395                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 396                 if (task)
 397                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 398                 return;
 399         }
 400
 401         if (ses->fc_slot_table.highest_used_slotid != -1)
 402                 return;
 403
 404         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 405         complete(&ses->fc_slot_table.complete);
 406 }
 407
 408 /*
 409  * Signal state manager thread if session back channel is drained
 410  */
 411 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 412 {
 413         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 414             ses->bc_slot_table.highest_used_slotid != -1)
 415                 return;
 416         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 417         complete(&ses->bc_slot_table.complete);
 418 }
 419
 420 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 421 {
 422         struct nfs4_slot_table *tbl;
 423
 424         tbl = &res->sr_session->fc_slot_table;
 425         if (!res->sr_slot) {
 426                 /* just wake up the next guy waiting since
 427                  * we may have not consumed a slot after all */
 428                 dprintk("%s: No slot\n", __func__);
 429                 return;
 430         }
 431
 432         spin_lock(&tbl->slot_tbl_lock);
 433         nfs4_free_slot(tbl, res->sr_slot);
 434         nfs4_check_drain_fc_complete(res->sr_session);
 435         spin_unlock(&tbl->slot_tbl_lock);
 436         res->sr_slot = NULL;
 437 }
 438
 439 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 440 {
 441         unsigned long timestamp;
 442         struct nfs_client *clp;
 443
 444         /*
 445          * sr_status remains 1 if an RPC level error occurred. The server
 446          * may or may not have processed the sequence operation..
 447          * Proceed as if the server received and processed the sequence
 448          * operation.
 449          */
 450         if (res->sr_status == 1)
 451                 res->sr_status = NFS_OK;
 452
 453         /* don't increment the sequence number if the task wasn't sent */
 454         if (!RPC_WAS_SENT(task))
 455                 goto out;
 456
 457         /* Check the SEQUENCE operation status */
 458         switch (res->sr_status) {
 459         case 0:
 460                 /* Update the slot's sequence and clientid lease timer */
 461                 ++res->sr_slot->seq_nr;
 462                 timestamp = res->sr_renewal_time;
 463                 clp = res->sr_session->clp;
 464                 do_renew_lease(clp, timestamp);
 465                 /* Check sequence flags */
 466                 if (res->sr_status_flags != 0)
 467                         nfs4_schedule_lease_recovery(clp);
 468                 break;
 469         case -NFS4ERR_DELAY:
 470                 /* The server detected a resend of the RPC call and
 471                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 472                  * of RFC5661.
 473                  */
 474                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 475                         __func__,
 476                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 477                         res->sr_slot->seq_nr);
 478                 goto out_retry;
 479         default:
 480                 /* Just update the slot sequence no. */
 481                 ++res->sr_slot->seq_nr;
 482         }
 483 out:
 484         /* The session may be reset by one of the error handlers. */
 485         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 486         nfs41_sequence_free_slot(res);
 487         return 1;
 488 out_retry:
 489         if (!rpc_restart_call(task))
 490                 goto out;
 491         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 492         return 0;
 493 }
 494
 495 static int nfs4_sequence_done(struct rpc_task *task,
 496                                struct nfs4_sequence_res *res)
 497 {
 498         if (res->sr_session == NULL)
 499                 return 1;
 500         return nfs41_sequence_done(task, res);
 501 }
 502
 503 /*
 504  * nfs4_find_slot - efficiently look for a free slot
 505  *
 506  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 507  * If found, we mark the slot as used, update the highest_used_slotid,
 508  * and respectively set up the sequence operation args.
 509  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 510  *
 511  * Note: must be called with under the slot_tbl_lock.
 512  */
 513 static u8
 514 nfs4_find_slot(struct nfs4_slot_table *tbl)
 515 {
 516         int slotid;
 517         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 518         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 519
 520         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 521                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 522                 tbl->max_slots);
 523         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 524         if (slotid >= tbl->max_slots)
 525                 goto out;
 526         __set_bit(slotid, tbl->used_slots);
 527         if (slotid > tbl->highest_used_slotid)
 528                 tbl->highest_used_slotid = slotid;
 529         ret_id = slotid;
 530 out:
 531         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 532                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 533         return ret_id;
 534 }
 535
 536 int nfs41_setup_sequence(struct nfs4_session *session,
 537                                 struct nfs4_sequence_args *args,
 538                                 struct nfs4_sequence_res *res,
 539                                 int cache_reply,
 540                                 struct rpc_task *task)
 541 {
 542         struct nfs4_slot *slot;
 543         struct nfs4_slot_table *tbl;
 544         u8 slotid;
 545
 546         dprintk("--> %s\n", __func__);
 547         /* slot already allocated? */
 548         if (res->sr_slot != NULL)
 549                 return 0;
 550
 551         tbl = &session->fc_slot_table;
 552
 553         spin_lock(&tbl->slot_tbl_lock);
 554         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 555             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 556                 /*
 557                  * The state manager will wait until the slot table is empty.
 558                  * Schedule the reset thread
 559                  */
 560                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 561                 spin_unlock(&tbl->slot_tbl_lock);
 562                 dprintk("%s Schedule Session Reset\n", __func__);
 563                 return -EAGAIN;
 564         }
 565
 566         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 567             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 568                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 569                 spin_unlock(&tbl->slot_tbl_lock);
 570                 dprintk("%s enforce FIFO order\n", __func__);
 571                 return -EAGAIN;
 572         }
 573
 574         slotid = nfs4_find_slot(tbl);
 575         if (slotid == NFS4_MAX_SLOT_TABLE) {
 576                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 577                 spin_unlock(&tbl->slot_tbl_lock);
 578                 dprintk("<-- %s: no free slots\n", __func__);
 579                 return -EAGAIN;
 580         }
 581         spin_unlock(&tbl->slot_tbl_lock);
 582
 583         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 584         slot = tbl->slots + slotid;
 585         args->sa_session = session;
 586         args->sa_slotid = slotid;
 587         args->sa_cache_this = cache_reply;
 588
 589         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 590
 591         res->sr_session = session;
 592         res->sr_slot = slot;
 593         res->sr_renewal_time = jiffies;
 594         res->sr_status_flags = 0;
 595         /*
 596          * sr_status is only set in decode_sequence, and so will remain
 597          * set to 1 if an rpc level failure occurs.
 598          */
 599         res->sr_status = 1;
 600         return 0;
 601 }
 602 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 603
 604 int nfs4_setup_sequence(const struct nfs_server *server,
 605                         struct nfs4_sequence_args *args,
 606                         struct nfs4_sequence_res *res,
 607                         int cache_reply,
 608                         struct rpc_task *task)
 609 {
 610         struct nfs4_session *session = nfs4_get_session(server);
 611         int ret = 0;
 612
 613         if (session == NULL) {
 614                 args->sa_session = NULL;
 615                 res->sr_session = NULL;
 616                 goto out;
 617         }
 618
 619         dprintk("--> %s clp %p session %p sr_slot %td\n",
 620                 __func__, session->clp, session, res->sr_slot ?
 621                         res->sr_slot - session->fc_slot_table.slots : -1);
 622
 623         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 624                                    task);
 625 out:
 626         dprintk("<-- %s status=%d\n", __func__, ret);
 627         return ret;
 628 }
 629
 630 struct nfs41_call_sync_data {
 631         const struct nfs_server *seq_server;
 632         struct nfs4_sequence_args *seq_args;
 633         struct nfs4_sequence_res *seq_res;
 634         int cache_reply;
 635 };
 636
 637 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 638 {
 639         struct nfs41_call_sync_data *data = calldata;
 640
 641         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 642
 643         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 644                                 data->seq_res, data->cache_reply, task))
 645                 return;
 646         rpc_call_start(task);
 647 }
 648
 649 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 650 {
 651         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 652         nfs41_call_sync_prepare(task, calldata);
 653 }
 654
 655 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 656 {
 657         struct nfs41_call_sync_data *data = calldata;
 658
 659         nfs41_sequence_done(task, data->seq_res);
 660 }
 661
 662 struct rpc_call_ops nfs41_call_sync_ops = {
 663         .rpc_call_prepare = nfs41_call_sync_prepare,
 664         .rpc_call_done = nfs41_call_sync_done,
 665 };
 666
 667 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 668         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 669         .rpc_call_done = nfs41_call_sync_done,
 670 };
 671
 672 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 673                                    struct nfs_server *server,
 674                                    struct rpc_message *msg,
 675                                    struct nfs4_sequence_args *args,
 676                                    struct nfs4_sequence_res *res,
 677                                    int cache_reply,
 678                                    int privileged)
 679 {
 680         int ret;
 681         struct rpc_task *task;
 682         struct nfs41_call_sync_data data = {
 683                 .seq_server = server,
 684                 .seq_args = args,
 685                 .seq_res = res,
 686                 .cache_reply = cache_reply,
 687         };
 688         struct rpc_task_setup task_setup = {
 689                 .rpc_client = clnt,
 690                 .rpc_message = msg,
 691                 .callback_ops = &nfs41_call_sync_ops,
 692                 .callback_data = &data
 693         };
 694
 695         res->sr_slot = NULL;
 696         if (privileged)
 697                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 698         task = rpc_run_task(&task_setup);
 699         if (IS_ERR(task))
 700                 ret = PTR_ERR(task);
 701         else {
 702                 ret = task->tk_status;
 703                 rpc_put_task(task);
 704         }
 705         return ret;
 706 }
 707
 708 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 709                             struct nfs_server *server,
 710                             struct rpc_message *msg,
 711                             struct nfs4_sequence_args *args,
 712                             struct nfs4_sequence_res *res,
 713                             int cache_reply)
 714 {
 715         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 716 }
 717
 718 #else
 719 static int nfs4_sequence_done(struct rpc_task *task,
 720                                struct nfs4_sequence_res *res)
 721 {
 722         return 1;
 723 }
 724 #endif /* CONFIG_NFS_V4_1 */
 725
 726 int _nfs4_call_sync(struct rpc_clnt *clnt,
 727                     struct nfs_server *server,
 728                     struct rpc_message *msg,
 729                     struct nfs4_sequence_args *args,
 730                     struct nfs4_sequence_res *res,
 731                     int cache_reply)
 732 {
 733         args->sa_session = res->sr_session = NULL;
 734         return rpc_call_sync(clnt, msg, 0);
 735 }
 736
 737 static inline
 738 int nfs4_call_sync(struct rpc_clnt *clnt,
 739                    struct nfs_server *server,
 740                    struct rpc_message *msg,
 741                    struct nfs4_sequence_args *args,
 742                    struct nfs4_sequence_res *res,
 743                    int cache_reply)
 744 {
 745         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 746                                                 args, res, cache_reply);
 747 }
 748
 749 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 750 {
 751         struct nfs_inode *nfsi = NFS_I(dir);
 752
 753         spin_lock(&dir->i_lock);
 754         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 755         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 756                 nfs_force_lookup_revalidate(dir);
 757         nfsi->change_attr = cinfo->after;
 758         spin_unlock(&dir->i_lock);
 759 }
 760
 761 struct nfs4_opendata {
 762         struct kref kref;
 763         struct nfs_openargs o_arg;
 764         struct nfs_openres o_res;
 765         struct nfs_open_confirmargs c_arg;
 766         struct nfs_open_confirmres c_res;
 767         struct nfs_fattr f_attr;
 768         struct nfs_fattr dir_attr;
 769         struct path path;
 770         struct dentry *dir;
 771         struct nfs4_state_owner *owner;
 772         struct nfs4_state *state;
 773         struct iattr attrs;
 774         unsigned long timestamp;
 775         unsigned int rpc_done : 1;
 776         int rpc_status;
 777         int cancelled;
 778 };
 779
 780
 781 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 782 {
 783         p->o_res.f_attr = &p->f_attr;
 784         p->o_res.dir_attr = &p->dir_attr;
 785         p->o_res.seqid = p->o_arg.seqid;
 786         p->c_res.seqid = p->c_arg.seqid;
 787         p->o_res.server = p->o_arg.server;
 788         nfs_fattr_init(&p->f_attr);
 789         nfs_fattr_init(&p->dir_attr);
 790 }
 791
 792 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 793                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 794                 const struct iattr *attrs,
 795                 gfp_t gfp_mask)
 796 {
 797         struct dentry *parent = dget_parent(path->dentry);
 798         struct inode *dir = parent->d_inode;
 799         struct nfs_server *server = NFS_SERVER(dir);
 800         struct nfs4_opendata *p;
 801
 802         p = kzalloc(sizeof(*p), gfp_mask);
 803         if (p == NULL)
 804                 goto err;
 805         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 806         if (p->o_arg.seqid == NULL)
 807                 goto err_free;
 808         path_get(path);
 809         p->path = *path;
 810         p->dir = parent;
 811         p->owner = sp;
 812         atomic_inc(&sp->so_count);
 813         p->o_arg.fh = NFS_FH(dir);
 814         p->o_arg.open_flags = flags;
 815         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 816         p->o_arg.clientid = server->nfs_client->cl_clientid;
 817         p->o_arg.id = sp->so_owner_id.id;
 818         p->o_arg.name = &p->path.dentry->d_name;
 819         p->o_arg.server = server;
 820         p->o_arg.bitmask = server->attr_bitmask;
 821         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 822         if (flags & O_CREAT) {
 823                 u32 *s;
 824
 825                 p->o_arg.u.attrs = &p->attrs;
 826                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 827                 s = (u32 *) p->o_arg.u.verifier.data;
 828                 s[0] = jiffies;
 829                 s[1] = current->pid;
 830         }
 831         p->c_arg.fh = &p->o_res.fh;
 832         p->c_arg.stateid = &p->o_res.stateid;
 833         p->c_arg.seqid = p->o_arg.seqid;
 834         nfs4_init_opendata_res(p);
 835         kref_init(&p->kref);
 836         return p;
 837 err_free:
 838         kfree(p);
 839 err:
 840         dput(parent);
 841         return NULL;
 842 }
 843
 844 static void nfs4_opendata_free(struct kref *kref)
 845 {
 846         struct nfs4_opendata *p = container_of(kref,
 847                         struct nfs4_opendata, kref);
 848
 849         nfs_free_seqid(p->o_arg.seqid);
 850         if (p->state != NULL)
 851                 nfs4_put_open_state(p->state);
 852         nfs4_put_state_owner(p->owner);
 853         dput(p->dir);
 854         path_put(&p->path);
 855         kfree(p);
 856 }
 857
 858 static void nfs4_opendata_put(struct nfs4_opendata *p)
 859 {
 860         if (p != NULL)
 861                 kref_put(&p->kref, nfs4_opendata_free);
 862 }
 863
 864 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 865 {
 866         int ret;
 867
 868         ret = rpc_wait_for_completion_task(task);
 869         return ret;
 870 }
 871
 872 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 873 {
 874         int ret = 0;
 875
 876         if (open_mode & O_EXCL)
 877                 goto out;
 878         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 879                 case FMODE_READ:
 880                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 881                                 && state->n_rdonly != 0;
 882                         break;
 883                 case FMODE_WRITE:
 884                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 885                                 && state->n_wronly != 0;
 886                         break;
 887                 case FMODE_READ|FMODE_WRITE:
 888                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 889                                 && state->n_rdwr != 0;
 890         }
 891 out:
 892         return ret;
 893 }
 894
 895 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 896 {
 897         if ((delegation->type & fmode) != fmode)
 898                 return 0;
 899         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 900                 return 0;
 901         nfs_mark_delegation_referenced(delegation);
 902         return 1;
 903 }
 904
 905 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 906 {
 907         switch (fmode) {
 908                 case FMODE_WRITE:
 909                         state->n_wronly++;
 910                         break;
 911                 case FMODE_READ:
 912                         state->n_rdonly++;
 913                         break;
 914                 case FMODE_READ|FMODE_WRITE:
 915                         state->n_rdwr++;
 916         }
 917         nfs4_state_set_mode_locked(state, state->state | fmode);
 918 }
 919
 920 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 921 {
 922         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 923                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 924         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 925         switch (fmode) {
 926                 case FMODE_READ:
 927                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 928                         break;
 929                 case FMODE_WRITE:
 930                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 931                         break;
 932                 case FMODE_READ|FMODE_WRITE:
 933                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 934         }
 935 }
 936
 937 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 938 {
 939         write_seqlock(&state->seqlock);
 940         nfs_set_open_stateid_locked(state, stateid, fmode);
 941         write_sequnlock(&state->seqlock);
 942 }
 943
 944 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 945 {
 946         /*
 947          * Protect the call to nfs4_state_set_mode_locked and
 948          * serialise the stateid update
 949          */
 950         write_seqlock(&state->seqlock);
 951         if (deleg_stateid != NULL) {
 952                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 953                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 954         }
 955         if (open_stateid != NULL)
 956                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 957         write_sequnlock(&state->seqlock);
 958         spin_lock(&state->owner->so_lock);
 959         update_open_stateflags(state, fmode);
 960         spin_unlock(&state->owner->so_lock);
 961 }
 962
 963 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 964 {
 965         struct nfs_inode *nfsi = NFS_I(state->inode);
 966         struct nfs_delegation *deleg_cur;
 967         int ret = 0;
 968
 969         fmode &= (FMODE_READ|FMODE_WRITE);
 970
 971         rcu_read_lock();
 972         deleg_cur = rcu_dereference(nfsi->delegation);
 973         if (deleg_cur == NULL)
 974                 goto no_delegation;
 975
 976         spin_lock(&deleg_cur->lock);
 977         if (nfsi->delegation != deleg_cur ||
 978             (deleg_cur->type & fmode) != fmode)
 979                 goto no_delegation_unlock;
 980
 981         if (delegation == NULL)
 982                 delegation = &deleg_cur->stateid;
 983         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 984                 goto no_delegation_unlock;
 985
 986         nfs_mark_delegation_referenced(deleg_cur);
 987         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 988         ret = 1;
 989 no_delegation_unlock:
 990         spin_unlock(&deleg_cur->lock);
 991 no_delegation:
 992         rcu_read_unlock();
 993
 994         if (!ret && open_stateid != NULL) {
 995                 __update_open_stateid(state, open_stateid, NULL, fmode);
 996                 ret = 1;
 997         }
 998
 999         return ret;
1000 }
1001
1002
1003 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1004 {
1005         struct nfs_delegation *delegation;
1006
1007         rcu_read_lock();
1008         delegation = rcu_dereference(NFS_I(inode)->delegation);
1009         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1010                 rcu_read_unlock();
1011                 return;
1012         }
1013         rcu_read_unlock();
1014         nfs_inode_return_delegation(inode);
1015 }
1016
1017 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1018 {
1019         struct nfs4_state *state = opendata->state;
1020         struct nfs_inode *nfsi = NFS_I(state->inode);
1021         struct nfs_delegation *delegation;
1022         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1023         fmode_t fmode = opendata->o_arg.fmode;
1024         nfs4_stateid stateid;
1025         int ret = -EAGAIN;
1026
1027         for (;;) {
1028                 if (can_open_cached(state, fmode, open_mode)) {
1029                         spin_lock(&state->owner->so_lock);
1030                         if (can_open_cached(state, fmode, open_mode)) {
1031                                 update_open_stateflags(state, fmode);
1032                                 spin_unlock(&state->owner->so_lock);
1033                                 goto out_return_state;
1034                         }
1035                         spin_unlock(&state->owner->so_lock);
1036                 }
1037                 rcu_read_lock();
1038                 delegation = rcu_dereference(nfsi->delegation);
1039                 if (delegation == NULL ||
1040                     !can_open_delegated(delegation, fmode)) {
1041                         rcu_read_unlock();
1042                         break;
1043                 }
1044                 /* Save the delegation */
1045                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1046                 rcu_read_unlock();
1047                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1048                 if (ret != 0)
1049                         goto out;
1050                 ret = -EAGAIN;
1051
1052                 /* Try to update the stateid using the delegation */
1053                 if (update_open_stateid(state, NULL, &stateid, fmode))
1054                         goto out_return_state;
1055         }
1056 out:
1057         return ERR_PTR(ret);
1058 out_return_state:
1059         atomic_inc(&state->count);
1060         return state;
1061 }
1062
1063 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1064 {
1065         struct inode *inode;
1066         struct nfs4_state *state = NULL;
1067         struct nfs_delegation *delegation;
1068         int ret;
1069
1070         if (!data->rpc_done) {
1071                 state = nfs4_try_open_cached(data);
1072                 goto out;
1073         }
1074
1075         ret = -EAGAIN;
1076         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1077                 goto err;
1078         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1079         ret = PTR_ERR(inode);
1080         if (IS_ERR(inode))
1081                 goto err;
1082         ret = -ENOMEM;
1083         state = nfs4_get_open_state(inode, data->owner);
1084         if (state == NULL)
1085                 goto err_put_inode;
1086         if (data->o_res.delegation_type != 0) {
1087                 int delegation_flags = 0;
1088
1089                 rcu_read_lock();
1090                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1091                 if (delegation)
1092                         delegation_flags = delegation->flags;
1093                 rcu_read_unlock();
1094                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1095                         nfs_inode_set_delegation(state->inode,
1096                                         data->owner->so_cred,
1097                                         &data->o_res);
1098                 else
1099                         nfs_inode_reclaim_delegation(state->inode,
1100                                         data->owner->so_cred,
1101                                         &data->o_res);
1102         }
1103
1104         update_open_stateid(state, &data->o_res.stateid, NULL,
1105                         data->o_arg.fmode);
1106         iput(inode);
1107 out:
1108         return state;
1109 err_put_inode:
1110         iput(inode);
1111 err:
1112         return ERR_PTR(ret);
1113 }
1114
1115 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1116 {
1117         struct nfs_inode *nfsi = NFS_I(state->inode);
1118         struct nfs_open_context *ctx;
1119
1120         spin_lock(&state->inode->i_lock);
1121         list_for_each_entry(ctx, &nfsi->open_files, list) {
1122                 if (ctx->state != state)
1123                         continue;
1124                 get_nfs_open_context(ctx);
1125                 spin_unlock(&state->inode->i_lock);
1126                 return ctx;
1127         }
1128         spin_unlock(&state->inode->i_lock);
1129         return ERR_PTR(-ENOENT);
1130 }
1131
1132 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1133 {
1134         struct nfs4_opendata *opendata;
1135
1136         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1137         if (opendata == NULL)
1138                 return ERR_PTR(-ENOMEM);
1139         opendata->state = state;
1140         atomic_inc(&state->count);
1141         return opendata;
1142 }
1143
1144 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1145 {
1146         struct nfs4_state *newstate;
1147         int ret;
1148
1149         opendata->o_arg.open_flags = 0;
1150         opendata->o_arg.fmode = fmode;
1151         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1152         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1153         nfs4_init_opendata_res(opendata);
1154         ret = _nfs4_recover_proc_open(opendata);
1155         if (ret != 0)
1156                 return ret;
1157         newstate = nfs4_opendata_to_nfs4_state(opendata);
1158         if (IS_ERR(newstate))
1159                 return PTR_ERR(newstate);
1160         nfs4_close_state(&opendata->path, newstate, fmode);
1161         *res = newstate;
1162         return 0;
1163 }
1164
1165 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1166 {
1167         struct nfs4_state *newstate;
1168         int ret;
1169
1170         /* memory barrier prior to reading state->n_* */
1171         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1172         smp_rmb();
1173         if (state->n_rdwr != 0) {
1174                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1175                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1176                 if (ret != 0)
1177                         return ret;
1178                 if (newstate != state)
1179                         return -ESTALE;
1180         }
1181         if (state->n_wronly != 0) {
1182                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1183                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1184                 if (ret != 0)
1185                         return ret;
1186                 if (newstate != state)
1187                         return -ESTALE;
1188         }
1189         if (state->n_rdonly != 0) {
1190                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1191                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1192                 if (ret != 0)
1193                         return ret;
1194                 if (newstate != state)
1195                         return -ESTALE;
1196         }
1197         /*
1198          * We may have performed cached opens for all three recoveries.
1199          * Check if we need to update the current stateid.
1200          */
1201         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1202             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1203                 write_seqlock(&state->seqlock);
1204                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1205                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1206                 write_sequnlock(&state->seqlock);
1207         }
1208         return 0;
1209 }
1210
1211 /*
1212  * OPEN_RECLAIM:
1213  *      reclaim state on the server after a reboot.
1214  */
1215 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1216 {
1217         struct nfs_delegation *delegation;
1218         struct nfs4_opendata *opendata;
1219         fmode_t delegation_type = 0;
1220         int status;
1221
1222         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1223         if (IS_ERR(opendata))
1224                 return PTR_ERR(opendata);
1225         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1226         opendata->o_arg.fh = NFS_FH(state->inode);
1227         rcu_read_lock();
1228         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1229         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1230                 delegation_type = delegation->type;
1231         rcu_read_unlock();
1232         opendata->o_arg.u.delegation_type = delegation_type;
1233         status = nfs4_open_recover(opendata, state);
1234         nfs4_opendata_put(opendata);
1235         return status;
1236 }
1237
1238 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1239 {
1240         struct nfs_server *server = NFS_SERVER(state->inode);
1241         struct nfs4_exception exception = { };
1242         int err;
1243         do {
1244                 err = _nfs4_do_open_reclaim(ctx, state);
1245                 if (err != -NFS4ERR_DELAY)
1246                         break;
1247                 nfs4_handle_exception(server, err, &exception);
1248         } while (exception.retry);
1249         return err;
1250 }
1251
1252 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1253 {
1254         struct nfs_open_context *ctx;
1255         int ret;
1256
1257         ctx = nfs4_state_find_open_context(state);
1258         if (IS_ERR(ctx))
1259                 return PTR_ERR(ctx);
1260         ret = nfs4_do_open_reclaim(ctx, state);
1261         put_nfs_open_context(ctx);
1262         return ret;
1263 }
1264
1265 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1266 {
1267         struct nfs4_opendata *opendata;
1268         int ret;
1269
1270         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1271         if (IS_ERR(opendata))
1272                 return PTR_ERR(opendata);
1273         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1274         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1275                         sizeof(opendata->o_arg.u.delegation.data));
1276         ret = nfs4_open_recover(opendata, state);
1277         nfs4_opendata_put(opendata);
1278         return ret;
1279 }
1280
1281 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1282 {
1283         struct nfs4_exception exception = { };
1284         struct nfs_server *server = NFS_SERVER(state->inode);
1285         int err;
1286         do {
1287                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1288                 switch (err) {
1289                         case 0:
1290                         case -ENOENT:
1291                         case -ESTALE:
1292                                 goto out;
1293                         case -NFS4ERR_BADSESSION:
1294                         case -NFS4ERR_BADSLOT:
1295                         case -NFS4ERR_BAD_HIGH_SLOT:
1296                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1297                         case -NFS4ERR_DEADSESSION:
1298                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1299                                 goto out;
1300                         case -NFS4ERR_STALE_CLIENTID:
1301                         case -NFS4ERR_STALE_STATEID:
1302                         case -NFS4ERR_EXPIRED:
1303                                 /* Don't recall a delegation if it was lost */
1304                                 nfs4_schedule_lease_recovery(server->nfs_client);
1305                                 goto out;
1306                         case -ERESTARTSYS:
1307                                 /*
1308                                  * The show must go on: exit, but mark the
1309                                  * stateid as needing recovery.
1310                                  */
1311                         case -NFS4ERR_DELEG_REVOKED:
1312                         case -NFS4ERR_ADMIN_REVOKED:
1313                         case -NFS4ERR_BAD_STATEID:
1314                                 nfs_inode_find_state_and_recover(state->inode,
1315                                                 stateid);
1316                                 nfs4_schedule_stateid_recovery(server, state);
1317                         case -EKEYEXPIRED:
1318                                 /*
1319                                  * User RPCSEC_GSS context has expired.
1320                                  * We cannot recover this stateid now, so
1321                                  * skip it and allow recovery thread to
1322                                  * proceed.
1323                                  */
1324                         case -ENOMEM:
1325                                 err = 0;
1326                                 goto out;
1327                 }
1328                 err = nfs4_handle_exception(server, err, &exception);
1329         } while (exception.retry);
1330 out:
1331         return err;
1332 }
1333
1334 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1335 {
1336         struct nfs4_opendata *data = calldata;
1337
1338         data->rpc_status = task->tk_status;
1339         if (data->rpc_status == 0) {
1340                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1341                                 sizeof(data->o_res.stateid.data));
1342                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1343                 renew_lease(data->o_res.server, data->timestamp);
1344                 data->rpc_done = 1;
1345         }
1346 }
1347
1348 static void nfs4_open_confirm_release(void *calldata)
1349 {
1350         struct nfs4_opendata *data = calldata;
1351         struct nfs4_state *state = NULL;
1352
1353         /* If this request hasn't been cancelled, do nothing */
1354         if (data->cancelled == 0)
1355                 goto out_free;
1356         /* In case of error, no cleanup! */
1357         if (!data->rpc_done)
1358                 goto out_free;
1359         state = nfs4_opendata_to_nfs4_state(data);
1360         if (!IS_ERR(state))
1361                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1362 out_free:
1363         nfs4_opendata_put(data);
1364 }
1365
1366 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1367         .rpc_call_done = nfs4_open_confirm_done,
1368         .rpc_release = nfs4_open_confirm_release,
1369 };
1370
1371 /*
1372  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1373  */
1374 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1375 {
1376         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1377         struct rpc_task *task;
1378         struct  rpc_message msg = {
1379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1380                 .rpc_argp = &data->c_arg,
1381                 .rpc_resp = &data->c_res,
1382                 .rpc_cred = data->owner->so_cred,
1383         };
1384         struct rpc_task_setup task_setup_data = {
1385                 .rpc_client = server->client,
1386                 .rpc_message = &msg,
1387                 .callback_ops = &nfs4_open_confirm_ops,
1388                 .callback_data = data,
1389                 .workqueue = nfsiod_workqueue,
1390                 .flags = RPC_TASK_ASYNC,
1391         };
1392         int status;
1393
1394         kref_get(&data->kref);
1395         data->rpc_done = 0;
1396         data->rpc_status = 0;
1397         data->timestamp = jiffies;
1398         task = rpc_run_task(&task_setup_data);
1399         if (IS_ERR(task))
1400                 return PTR_ERR(task);
1401         status = nfs4_wait_for_completion_rpc_task(task);
1402         if (status != 0) {
1403                 data->cancelled = 1;
1404                 smp_wmb();
1405         } else
1406                 status = data->rpc_status;
1407         rpc_put_task(task);
1408         return status;
1409 }
1410
1411 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1412 {
1413         struct nfs4_opendata *data = calldata;
1414         struct nfs4_state_owner *sp = data->owner;
1415
1416         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1417                 return;
1418         /*
1419          * Check if we still need to send an OPEN call, or if we can use
1420          * a delegation instead.
1421          */
1422         if (data->state != NULL) {
1423                 struct nfs_delegation *delegation;
1424
1425                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1426                         goto out_no_action;
1427                 rcu_read_lock();
1428                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1429                 if (delegation != NULL &&
1430                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1431                         rcu_read_unlock();
1432                         goto out_no_action;
1433                 }
1434                 rcu_read_unlock();
1435         }
1436         /* Update sequence id. */
1437         data->o_arg.id = sp->so_owner_id.id;
1438         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1439         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1440                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1441                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1442         }
1443         data->timestamp = jiffies;
1444         if (nfs4_setup_sequence(data->o_arg.server,
1445                                 &data->o_arg.seq_args,
1446                                 &data->o_res.seq_res, 1, task))
1447                 return;
1448         rpc_call_start(task);
1449         return;
1450 out_no_action:
1451         task->tk_action = NULL;
1452
1453 }
1454
1455 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1456 {
1457         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1458         nfs4_open_prepare(task, calldata);
1459 }
1460
1461 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1462 {
1463         struct nfs4_opendata *data = calldata;
1464
1465         data->rpc_status = task->tk_status;
1466
1467         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1468                 return;
1469
1470         if (task->tk_status == 0) {
1471                 switch (data->o_res.f_attr->mode & S_IFMT) {
1472                         case S_IFREG:
1473                                 break;
1474                         case S_IFLNK:
1475                                 data->rpc_status = -ELOOP;
1476                                 break;
1477                         case S_IFDIR:
1478                                 data->rpc_status = -EISDIR;
1479                                 break;
1480                         default:
1481                                 data->rpc_status = -ENOTDIR;
1482                 }
1483                 renew_lease(data->o_res.server, data->timestamp);
1484                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1485                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1486         }
1487         data->rpc_done = 1;
1488 }
1489
1490 static void nfs4_open_release(void *calldata)
1491 {
1492         struct nfs4_opendata *data = calldata;
1493         struct nfs4_state *state = NULL;
1494
1495         /* If this request hasn't been cancelled, do nothing */
1496         if (data->cancelled == 0)
1497                 goto out_free;
1498         /* In case of error, no cleanup! */
1499         if (data->rpc_status != 0 || !data->rpc_done)
1500                 goto out_free;
1501         /* In case we need an open_confirm, no cleanup! */
1502         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1503                 goto out_free;
1504         state = nfs4_opendata_to_nfs4_state(data);
1505         if (!IS_ERR(state))
1506                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1507 out_free:
1508         nfs4_opendata_put(data);
1509 }
1510
1511 static const struct rpc_call_ops nfs4_open_ops = {
1512         .rpc_call_prepare = nfs4_open_prepare,
1513         .rpc_call_done = nfs4_open_done,
1514         .rpc_release = nfs4_open_release,
1515 };
1516
1517 static const struct rpc_call_ops nfs4_recover_open_ops = {
1518         .rpc_call_prepare = nfs4_recover_open_prepare,
1519         .rpc_call_done = nfs4_open_done,
1520         .rpc_release = nfs4_open_release,
1521 };
1522
1523 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1524 {
1525         struct inode *dir = data->dir->d_inode;
1526         struct nfs_server *server = NFS_SERVER(dir);
1527         struct nfs_openargs *o_arg = &data->o_arg;
1528         struct nfs_openres *o_res = &data->o_res;
1529         struct rpc_task *task;
1530         struct rpc_message msg = {
1531                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1532                 .rpc_argp = o_arg,
1533                 .rpc_resp = o_res,
1534                 .rpc_cred = data->owner->so_cred,
1535         };
1536         struct rpc_task_setup task_setup_data = {
1537                 .rpc_client = server->client,
1538                 .rpc_message = &msg,
1539                 .callback_ops = &nfs4_open_ops,
1540                 .callback_data = data,
1541                 .workqueue = nfsiod_workqueue,
1542                 .flags = RPC_TASK_ASYNC,
1543         };
1544         int status;
1545
1546         kref_get(&data->kref);
1547         data->rpc_done = 0;
1548         data->rpc_status = 0;
1549         data->cancelled = 0;
1550         if (isrecover)
1551                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1552         task = rpc_run_task(&task_setup_data);
1553         if (IS_ERR(task))
1554                 return PTR_ERR(task);
1555         status = nfs4_wait_for_completion_rpc_task(task);
1556         if (status != 0) {
1557                 data->cancelled = 1;
1558                 smp_wmb();
1559         } else
1560                 status = data->rpc_status;
1561         rpc_put_task(task);
1562
1563         return status;
1564 }
1565
1566 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1567 {
1568         struct inode *dir = data->dir->d_inode;
1569         struct nfs_openres *o_res = &data->o_res;
1570         int status;
1571
1572         status = nfs4_run_open_task(data, 1);
1573         if (status != 0 || !data->rpc_done)
1574                 return status;
1575
1576         nfs_refresh_inode(dir, o_res->dir_attr);
1577
1578         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1579                 status = _nfs4_proc_open_confirm(data);
1580                 if (status != 0)
1581                         return status;
1582         }
1583
1584         return status;
1585 }
1586
1587 /*
1588  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1589  */
1590 static int _nfs4_proc_open(struct nfs4_opendata *data)
1591 {
1592         struct inode *dir = data->dir->d_inode;
1593         struct nfs_server *server = NFS_SERVER(dir);
1594         struct nfs_openargs *o_arg = &data->o_arg;
1595         struct nfs_openres *o_res = &data->o_res;
1596         int status;
1597
1598         status = nfs4_run_open_task(data, 0);
1599         if (status != 0 || !data->rpc_done)
1600                 return status;
1601
1602         if (o_arg->open_flags & O_CREAT) {
1603                 update_changeattr(dir, &o_res->cinfo);
1604                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1605         } else
1606                 nfs_refresh_inode(dir, o_res->dir_attr);
1607         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1608                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1609         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1610                 status = _nfs4_proc_open_confirm(data);
1611                 if (status != 0)
1612                         return status;
1613         }
1614         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1615                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1616         return 0;
1617 }
1618
1619 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1620 {
1621         unsigned int loop;
1622         int ret;
1623
1624         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1625                 ret = nfs4_wait_clnt_recover(clp);
1626                 if (ret != 0)
1627                         break;
1628                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1629                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1630                         break;
1631                 nfs4_schedule_state_manager(clp);
1632                 ret = -EIO;
1633         }
1634         return ret;
1635 }
1636
1637 static int nfs4_recover_expired_lease(struct nfs_server *server)
1638 {
1639         return nfs4_client_recover_expired_lease(server->nfs_client);
1640 }
1641
1642 /*
1643  * OPEN_EXPIRED:
1644  *      reclaim state on the server after a network partition.
1645  *      Assumes caller holds the appropriate lock
1646  */
1647 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1648 {
1649         struct nfs4_opendata *opendata;
1650         int ret;
1651
1652         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1653         if (IS_ERR(opendata))
1654                 return PTR_ERR(opendata);
1655         ret = nfs4_open_recover(opendata, state);
1656         if (ret == -ESTALE)
1657                 d_drop(ctx->path.dentry);
1658         nfs4_opendata_put(opendata);
1659         return ret;
1660 }
1661
1662 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1663 {
1664         struct nfs_server *server = NFS_SERVER(state->inode);
1665         struct nfs4_exception exception = { };
1666         int err;
1667
1668         do {
1669                 err = _nfs4_open_expired(ctx, state);
1670                 switch (err) {
1671                 default:
1672                         goto out;
1673                 case -NFS4ERR_GRACE:
1674                 case -NFS4ERR_DELAY:
1675                         nfs4_handle_exception(server, err, &exception);
1676                         err = 0;
1677                 }
1678         } while (exception.retry);
1679 out:
1680         return err;
1681 }
1682
1683 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1684 {
1685         struct nfs_open_context *ctx;
1686         int ret;
1687
1688         ctx = nfs4_state_find_open_context(state);
1689         if (IS_ERR(ctx))
1690                 return PTR_ERR(ctx);
1691         ret = nfs4_do_open_expired(ctx, state);
1692         put_nfs_open_context(ctx);
1693         return ret;
1694 }
1695
1696 /*
1697  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1698  * fields corresponding to attributes that were used to store the verifier.
1699  * Make sure we clobber those fields in the later setattr call
1700  */
1701 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1702 {
1703         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1704             !(sattr->ia_valid & ATTR_ATIME_SET))
1705                 sattr->ia_valid |= ATTR_ATIME;
1706
1707         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1708             !(sattr->ia_valid & ATTR_MTIME_SET))
1709                 sattr->ia_valid |= ATTR_MTIME;
1710 }
1711
1712 /*
1713  * Returns a referenced nfs4_state
1714  */
1715 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1716 {
1717         struct nfs4_state_owner  *sp;
1718         struct nfs4_state     *state = NULL;
1719         struct nfs_server       *server = NFS_SERVER(dir);
1720         struct nfs4_opendata *opendata;
1721         int status;
1722
1723         /* Protect against reboot recovery conflicts */
1724         status = -ENOMEM;
1725         if (!(sp = nfs4_get_state_owner(server, cred))) {
1726                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1727                 goto out_err;
1728         }
1729         status = nfs4_recover_expired_lease(server);
1730         if (status != 0)
1731                 goto err_put_state_owner;
1732         if (path->dentry->d_inode != NULL)
1733                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1734         status = -ENOMEM;
1735         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1736         if (opendata == NULL)
1737                 goto err_put_state_owner;
1738
1739         if (path->dentry->d_inode != NULL)
1740                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1741
1742         status = _nfs4_proc_open(opendata);
1743         if (status != 0)
1744                 goto err_opendata_put;
1745
1746         state = nfs4_opendata_to_nfs4_state(opendata);
1747         status = PTR_ERR(state);
1748         if (IS_ERR(state))
1749                 goto err_opendata_put;
1750         if (server->caps & NFS_CAP_POSIX_LOCK)
1751                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1752
1753         if (opendata->o_arg.open_flags & O_EXCL) {
1754                 nfs4_exclusive_attrset(opendata, sattr);
1755
1756                 nfs_fattr_init(opendata->o_res.f_attr);
1757                 status = nfs4_do_setattr(state->inode, cred,
1758                                 opendata->o_res.f_attr, sattr,
1759                                 state);
1760                 if (status == 0)
1761                         nfs_setattr_update_inode(state->inode, sattr);
1762                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1763         }
1764         nfs4_opendata_put(opendata);
1765         nfs4_put_state_owner(sp);
1766         *res = state;
1767         return 0;
1768 err_opendata_put:
1769         nfs4_opendata_put(opendata);
1770 err_put_state_owner:
1771         nfs4_put_state_owner(sp);
1772 out_err:
1773         *res = NULL;
1774         return status;
1775 }
1776
1777
1778 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1779 {
1780         struct nfs4_exception exception = { };
1781         struct nfs4_state *res;
1782         int status;
1783
1784         do {
1785                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1786                 if (status == 0)
1787                         break;
1788                 /* NOTE: BAD_SEQID means the server and client disagree about the
1789                  * book-keeping w.r.t. state-changing operations
1790                  * (OPEN/CLOSE/LOCK/LOCKU...)
1791                  * It is actually a sign of a bug on the client or on the server.
1792                  *
1793                  * If we receive a BAD_SEQID error in the particular case of
1794                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1795                  * have unhashed the old state_owner for us, and that we can
1796                  * therefore safely retry using a new one. We should still warn
1797                  * the user though...
1798                  */
1799                 if (status == -NFS4ERR_BAD_SEQID) {
1800                         printk(KERN_WARNING "NFS: v4 server %s "
1801                                         " returned a bad sequence-id error!\n",
1802                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1803                         exception.retry = 1;
1804                         continue;
1805                 }
1806                 /*
1807                  * BAD_STATEID on OPEN means that the server cancelled our
1808                  * state before it received the OPEN_CONFIRM.
1809                  * Recover by retrying the request as per the discussion
1810                  * on Page 181 of RFC3530.
1811                  */
1812                 if (status == -NFS4ERR_BAD_STATEID) {
1813                         exception.retry = 1;
1814                         continue;
1815                 }
1816                 if (status == -EAGAIN) {
1817                         /* We must have found a delegation */
1818                         exception.retry = 1;
1819                         continue;
1820                 }
1821                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1822                                         status, &exception));
1823         } while (exception.retry);
1824         return res;
1825 }
1826
1827 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1828                             struct nfs_fattr *fattr, struct iattr *sattr,
1829                             struct nfs4_state *state)
1830 {
1831         struct nfs_server *server = NFS_SERVER(inode);
1832         struct nfs_setattrargs  arg = {
1833                 .fh             = NFS_FH(inode),
1834                 .iap            = sattr,
1835                 .server         = server,
1836                 .bitmask = server->attr_bitmask,
1837         };
1838         struct nfs_setattrres  res = {
1839                 .fattr          = fattr,
1840                 .server         = server,
1841         };
1842         struct rpc_message msg = {
1843                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1844                 .rpc_argp       = &arg,
1845                 .rpc_resp       = &res,
1846                 .rpc_cred       = cred,
1847         };
1848         unsigned long timestamp = jiffies;
1849         int status;
1850
1851         nfs_fattr_init(fattr);
1852
1853         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1854                 /* Use that stateid */
1855         } else if (state != NULL) {
1856                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1857         } else
1858                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1859
1860         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1861         if (status == 0 && state != NULL)
1862                 renew_lease(server, timestamp);
1863         return status;
1864 }
1865
1866 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1867                            struct nfs_fattr *fattr, struct iattr *sattr,
1868                            struct nfs4_state *state)
1869 {
1870         struct nfs_server *server = NFS_SERVER(inode);
1871         struct nfs4_exception exception = {
1872                 .state = state,
1873         };
1874         int err;
1875         do {
1876                 err = nfs4_handle_exception(server,
1877                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1878                                 &exception);
1879         } while (exception.retry);
1880         return err;
1881 }
1882
1883 struct nfs4_closedata {
1884         struct path path;
1885         struct inode *inode;
1886         struct nfs4_state *state;
1887         struct nfs_closeargs arg;
1888         struct nfs_closeres res;
1889         struct nfs_fattr fattr;
1890         unsigned long timestamp;
1891         bool roc;
1892         u32 roc_barrier;
1893 };
1894
1895 static void nfs4_free_closedata(void *data)
1896 {
1897         struct nfs4_closedata *calldata = data;
1898         struct nfs4_state_owner *sp = calldata->state->owner;
1899
1900         if (calldata->roc)
1901                 pnfs_roc_release(calldata->state->inode);
1902         nfs4_put_open_state(calldata->state);
1903         nfs_free_seqid(calldata->arg.seqid);
1904         nfs4_put_state_owner(sp);
1905         path_put(&calldata->path);
1906         kfree(calldata);
1907 }
1908
1909 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1910                 fmode_t fmode)
1911 {
1912         spin_lock(&state->owner->so_lock);
1913         if (!(fmode & FMODE_READ))
1914                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1915         if (!(fmode & FMODE_WRITE))
1916                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1917         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1918         spin_unlock(&state->owner->so_lock);
1919 }
1920
1921 static void nfs4_close_done(struct rpc_task *task, void *data)
1922 {
1923         struct nfs4_closedata *calldata = data;
1924         struct nfs4_state *state = calldata->state;
1925         struct nfs_server *server = NFS_SERVER(calldata->inode);
1926
1927         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1928                 return;
1929         /* hmm. we are done with the inode, and in the process of freeing
1930          * the state_owner. we keep this around to process errors
1931          */
1932         switch (task->tk_status) {
1933                 case 0:
1934                         if (calldata->roc)
1935                                 pnfs_roc_set_barrier(state->inode,
1936                                                      calldata->roc_barrier);
1937                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1938                         renew_lease(server, calldata->timestamp);
1939                         nfs4_close_clear_stateid_flags(state,
1940                                         calldata->arg.fmode);
1941                         break;
1942                 case -NFS4ERR_STALE_STATEID:
1943                 case -NFS4ERR_OLD_STATEID:
1944                 case -NFS4ERR_BAD_STATEID:
1945                 case -NFS4ERR_EXPIRED:
1946                         if (calldata->arg.fmode == 0)
1947                                 break;
1948                 default:
1949                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1950                                 rpc_restart_call_prepare(task);
1951         }
1952         nfs_release_seqid(calldata->arg.seqid);
1953         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1954 }
1955
1956 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1957 {
1958         struct nfs4_closedata *calldata = data;
1959         struct nfs4_state *state = calldata->state;
1960         int call_close = 0;
1961
1962         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1963                 return;
1964
1965         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1966         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1967         spin_lock(&state->owner->so_lock);
1968         /* Calculate the change in open mode */
1969         if (state->n_rdwr == 0) {
1970                 if (state->n_rdonly == 0) {
1971                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1972                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1973                         calldata->arg.fmode &= ~FMODE_READ;
1974                 }
1975                 if (state->n_wronly == 0) {
1976                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1977                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1978                         calldata->arg.fmode &= ~FMODE_WRITE;
1979                 }
1980         }
1981         spin_unlock(&state->owner->so_lock);
1982
1983         if (!call_close) {
1984                 /* Note: exit _without_ calling nfs4_close_done */
1985                 task->tk_action = NULL;
1986                 return;
1987         }
1988
1989         if (calldata->arg.fmode == 0) {
1990                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1991                 if (calldata->roc &&
1992                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1993                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1994                                      task, NULL);
1995                         return;
1996                 }
1997         }
1998
1999         nfs_fattr_init(calldata->res.fattr);
2000         calldata->timestamp = jiffies;
2001         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2002                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2003                                 1, task))
2004                 return;
2005         rpc_call_start(task);
2006 }
2007
2008 static const struct rpc_call_ops nfs4_close_ops = {
2009         .rpc_call_prepare = nfs4_close_prepare,
2010         .rpc_call_done = nfs4_close_done,
2011         .rpc_release = nfs4_free_closedata,
2012 };
2013
2014 /*
2015  * It is possible for data to be read/written from a mem-mapped file
2016  * after the sys_close call (which hits the vfs layer as a flush).
2017  * This means that we can't safely call nfsv4 close on a file until
2018  * the inode is cleared. This in turn means that we are not good
2019  * NFSv4 citizens - we do not indicate to the server to update the file's
2020  * share state even when we are done with one of the three share
2021  * stateid's in the inode.
2022  *
2023  * NOTE: Caller must be holding the sp->so_owner semaphore!
2024  */
2025 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2026 {
2027         struct nfs_server *server = NFS_SERVER(state->inode);
2028         struct nfs4_closedata *calldata;
2029         struct nfs4_state_owner *sp = state->owner;
2030         struct rpc_task *task;
2031         struct rpc_message msg = {
2032                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2033                 .rpc_cred = state->owner->so_cred,
2034         };
2035         struct rpc_task_setup task_setup_data = {
2036                 .rpc_client = server->client,
2037                 .rpc_message = &msg,
2038                 .callback_ops = &nfs4_close_ops,
2039                 .workqueue = nfsiod_workqueue,
2040                 .flags = RPC_TASK_ASYNC,
2041         };
2042         int status = -ENOMEM;
2043
2044         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2045         if (calldata == NULL)
2046                 goto out;
2047         calldata->inode = state->inode;
2048         calldata->state = state;
2049         calldata->arg.fh = NFS_FH(state->inode);
2050         calldata->arg.stateid = &state->open_stateid;
2051         /* Serialization for the sequence id */
2052         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2053         if (calldata->arg.seqid == NULL)
2054                 goto out_free_calldata;
2055         calldata->arg.fmode = 0;
2056         calldata->arg.bitmask = server->cache_consistency_bitmask;
2057         calldata->res.fattr = &calldata->fattr;
2058         calldata->res.seqid = calldata->arg.seqid;
2059         calldata->res.server = server;
2060         calldata->roc = roc;
2061         path_get(path);
2062         calldata->path = *path;
2063
2064         msg.rpc_argp = &calldata->arg;
2065         msg.rpc_resp = &calldata->res;
2066         task_setup_data.callback_data = calldata;
2067         task = rpc_run_task(&task_setup_data);
2068         if (IS_ERR(task))
2069                 return PTR_ERR(task);
2070         status = 0;
2071         if (wait)
2072                 status = rpc_wait_for_completion_task(task);
2073         rpc_put_task(task);
2074         return status;
2075 out_free_calldata:
2076         kfree(calldata);
2077 out:
2078         if (roc)
2079                 pnfs_roc_release(state->inode);
2080         nfs4_put_open_state(state);
2081         nfs4_put_state_owner(sp);
2082         return status;
2083 }
2084
2085 static struct inode *
2086 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2087 {
2088         struct nfs4_state *state;
2089
2090         /* Protect against concurrent sillydeletes */
2091         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2092         if (IS_ERR(state))
2093                 return ERR_CAST(state);
2094         ctx->state = state;
2095         return igrab(state->inode);
2096 }
2097
2098 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2099 {
2100         if (ctx->state == NULL)
2101                 return;
2102         if (is_sync)
2103                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2104         else
2105                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2106 }
2107
2108 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2109 {
2110         struct nfs4_server_caps_arg args = {
2111                 .fhandle = fhandle,
2112         };
2113         struct nfs4_server_caps_res res = {};
2114         struct rpc_message msg = {
2115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2116                 .rpc_argp = &args,
2117                 .rpc_resp = &res,
2118         };
2119         int status;
2120
2121         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2122         if (status == 0) {
2123                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2124                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2125                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2126                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2127                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2128                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2129                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2130                         server->caps |= NFS_CAP_ACLS;
2131                 if (res.has_links != 0)
2132                         server->caps |= NFS_CAP_HARDLINKS;
2133                 if (res.has_symlinks != 0)
2134                         server->caps |= NFS_CAP_SYMLINKS;
2135                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2136                         server->caps |= NFS_CAP_FILEID;
2137                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2138                         server->caps |= NFS_CAP_MODE;
2139                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2140                         server->caps |= NFS_CAP_NLINK;
2141                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2142                         server->caps |= NFS_CAP_OWNER;
2143                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2144                         server->caps |= NFS_CAP_OWNER_GROUP;
2145                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2146                         server->caps |= NFS_CAP_ATIME;
2147                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2148                         server->caps |= NFS_CAP_CTIME;
2149                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2150                         server->caps |= NFS_CAP_MTIME;
2151
2152                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2153                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2154                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2155                 server->acl_bitmask = res.acl_bitmask;
2156         }
2157
2158         return status;
2159 }
2160
2161 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2162 {
2163         struct nfs4_exception exception = { };
2164         int err;
2165         do {
2166                 err = nfs4_handle_exception(server,
2167                                 _nfs4_server_capabilities(server, fhandle),
2168                                 &exception);
2169         } while (exception.retry);
2170         return err;
2171 }
2172
2173 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2174                 struct nfs_fsinfo *info)
2175 {
2176         struct nfs4_lookup_root_arg args = {
2177                 .bitmask = nfs4_fattr_bitmap,
2178         };
2179         struct nfs4_lookup_res res = {
2180                 .server = server,
2181                 .fattr = info->fattr,
2182                 .fh = fhandle,
2183         };
2184         struct rpc_message msg = {
2185                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2186                 .rpc_argp = &args,
2187                 .rpc_resp = &res,
2188         };
2189
2190         nfs_fattr_init(info->fattr);
2191         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2192 }
2193
2194 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2195                 struct nfs_fsinfo *info)
2196 {
2197         struct nfs4_exception exception = { };
2198         int err;
2199         do {
2200                 err = _nfs4_lookup_root(server, fhandle, info);
2201                 switch (err) {
2202                 case 0:
2203                 case -NFS4ERR_WRONGSEC:
2204                         break;
2205                 default:
2206                         err = nfs4_handle_exception(server, err, &exception);
2207                 }
2208         } while (exception.retry);
2209         return err;
2210 }
2211
2212 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2213                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2214 {
2215         struct rpc_auth *auth;
2216         int ret;
2217
2218         auth = rpcauth_create(flavor, server->client);
2219         if (!auth) {
2220                 ret = -EIO;
2221                 goto out;
2222         }
2223         ret = nfs4_lookup_root(server, fhandle, info);
2224 out:
2225         return ret;
2226 }
2227
2228 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2229                               struct nfs_fsinfo *info)
2230 {
2231         int i, len, status = 0;
2232         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2233
2234         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2235         flav_array[len] = RPC_AUTH_NULL;
2236         len += 1;
2237
2238         for (i = 0; i < len; i++) {
2239                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2240                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2241                         continue;
2242                 break;
2243         }
2244         /*
2245          * -EACCESS could mean that the user doesn't have correct permissions
2246          * to access the mount.  It could also mean that we tried to mount
2247          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2248          * existing mount programs don't handle -EACCES very well so it should
2249          * be mapped to -EPERM instead.
2250          */
2251         if (status == -EACCES)
2252                 status = -EPERM;
2253         return status;
2254 }
2255
2256 /*
2257  * get the file handle for the "/" directory on the server
2258  */
2259 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2260                               struct nfs_fsinfo *info)
2261 {
2262         int status = nfs4_lookup_root(server, fhandle, info);
2263         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2264                 /*
2265                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2266                  * by nfs4_map_errors() as this function exits.
2267                  */
2268                 status = nfs4_find_root_sec(server, fhandle, info);
2269         if (status == 0)
2270                 status = nfs4_server_capabilities(server, fhandle);
2271         if (status == 0)
2272                 status = nfs4_do_fsinfo(server, fhandle, info);
2273         return nfs4_map_errors(status);
2274 }
2275
2276 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2277 /*
2278  * Get locations and (maybe) other attributes of a referral.
2279  * Note that we'll actually follow the referral later when
2280  * we detect fsid mismatch in inode revalidation
2281  */
2282 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2283                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2284 {
2285         int status = -ENOMEM;
2286         struct page *page = NULL;
2287         struct nfs4_fs_locations *locations = NULL;
2288
2289         page = alloc_page(GFP_KERNEL);
2290         if (page == NULL)
2291                 goto out;
2292         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2293         if (locations == NULL)
2294                 goto out;
2295
2296         status = nfs4_proc_fs_locations(dir, name, locations, page);
2297         if (status != 0)
2298                 goto out;
2299         /* Make sure server returned a different fsid for the referral */
2300         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2301                 dprintk("%s: server did not return a different fsid for"
2302                         " a referral at %s\n", __func__, name->name);
2303                 status = -EIO;
2304                 goto out;
2305         }
2306         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2307         nfs_fixup_referral_attributes(&locations->fattr);
2308
2309         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2310         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2311         memset(fhandle, 0, sizeof(struct nfs_fh));
2312 out:
2313         if (page)
2314                 __free_page(page);
2315         kfree(locations);
2316         return status;
2317 }
2318
2319 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2320 {
2321         struct nfs4_getattr_arg args = {
2322                 .fh = fhandle,
2323                 .bitmask = server->attr_bitmask,
2324         };
2325         struct nfs4_getattr_res res = {
2326                 .fattr = fattr,
2327                 .server = server,
2328         };
2329         struct rpc_message msg = {
2330                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2331                 .rpc_argp = &args,
2332                 .rpc_resp = &res,
2333         };
2334
2335         nfs_fattr_init(fattr);
2336         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2337 }
2338
2339 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2340 {
2341         struct nfs4_exception exception = { };
2342         int err;
2343         do {
2344                 err = nfs4_handle_exception(server,
2345                                 _nfs4_proc_getattr(server, fhandle, fattr),
2346                                 &exception);
2347         } while (exception.retry);
2348         return err;
2349 }
2350
2351 /*
2352  * The file is not closed if it is opened due to the a request to change
2353  * the size of the file. The open call will not be needed once the
2354  * VFS layer lookup-intents are implemented.
2355  *
2356  * Close is called when the inode is destroyed.
2357  * If we haven't opened the file for O_WRONLY, we
2358  * need to in the size_change case to obtain a stateid.
2359  *
2360  * Got race?
2361  * Because OPEN is always done by name in nfsv4, it is
2362  * possible that we opened a different file by the same
2363  * name.  We can recognize this race condition, but we
2364  * can't do anything about it besides returning an error.
2365  *
2366  * This will be fixed with VFS changes (lookup-intent).
2367  */
2368 static int
2369 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2370                   struct iattr *sattr)
2371 {
2372         struct inode *inode = dentry->d_inode;
2373         struct rpc_cred *cred = NULL;
2374         struct nfs4_state *state = NULL;
2375         int status;
2376
2377         if (pnfs_ld_layoutret_on_setattr(inode))
2378                 pnfs_return_layout(inode);
2379
2380         nfs_fattr_init(fattr);
2381
2382         /* Search for an existing open(O_WRITE) file */
2383         if (sattr->ia_valid & ATTR_FILE) {
2384                 struct nfs_open_context *ctx;
2385
2386                 ctx = nfs_file_open_context(sattr->ia_file);
2387                 if (ctx) {
2388                         cred = ctx->cred;
2389                         state = ctx->state;
2390                 }
2391         }
2392
2393         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2394         if (status == 0)
2395                 nfs_setattr_update_inode(inode, sattr);
2396         return status;
2397 }
2398
2399 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2400                 const struct nfs_fh *dirfh, const struct qstr *name,
2401                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2402 {
2403         int                    status;
2404         struct nfs4_lookup_arg args = {
2405                 .bitmask = server->attr_bitmask,
2406                 .dir_fh = dirfh,
2407                 .name = name,
2408         };
2409         struct nfs4_lookup_res res = {
2410                 .server = server,
2411                 .fattr = fattr,
2412                 .fh = fhandle,
2413         };
2414         struct rpc_message msg = {
2415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2416                 .rpc_argp = &args,
2417                 .rpc_resp = &res,
2418         };
2419
2420         nfs_fattr_init(fattr);
2421
2422         dprintk("NFS call  lookupfh %s\n", name->name);
2423         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2424         dprintk("NFS reply lookupfh: %d\n", status);
2425         return status;
2426 }
2427
2428 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2429                               struct qstr *name, struct nfs_fh *fhandle,
2430                               struct nfs_fattr *fattr)
2431 {
2432         struct nfs4_exception exception = { };
2433         int err;
2434         do {
2435                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2436                 /* FIXME: !!!! */
2437                 if (err == -NFS4ERR_MOVED) {
2438                         err = -EREMOTE;
2439                         break;
2440                 }
2441                 err = nfs4_handle_exception(server, err, &exception);
2442         } while (exception.retry);
2443         return err;
2444 }
2445
2446 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2447                 const struct qstr *name, struct nfs_fh *fhandle,
2448                 struct nfs_fattr *fattr)
2449 {
2450         int status;
2451
2452         dprintk("NFS call  lookup %s\n", name->name);
2453         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2454         if (status == -NFS4ERR_MOVED)
2455                 status = nfs4_get_referral(dir, name, fattr, fhandle);
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                 err = nfs4_handle_exception(NFS_SERVER(dir),
2477                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2478                                 &exception);
2479                 if (err == -EPERM)
2480                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2481         } while (exception.retry);
2482         return err;
2483 }
2484
2485 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2486 {
2487         struct nfs_server *server = NFS_SERVER(inode);
2488         struct nfs4_accessargs args = {
2489                 .fh = NFS_FH(inode),
2490                 .bitmask = server->attr_bitmask,
2491         };
2492         struct nfs4_accessres res = {
2493                 .server = server,
2494         };
2495         struct rpc_message msg = {
2496                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2497                 .rpc_argp = &args,
2498                 .rpc_resp = &res,
2499                 .rpc_cred = entry->cred,
2500         };
2501         int mode = entry->mask;
2502         int status;
2503
2504         /*
2505          * Determine which access bits we want to ask for...
2506          */
2507         if (mode & MAY_READ)
2508                 args.access |= NFS4_ACCESS_READ;
2509         if (S_ISDIR(inode->i_mode)) {
2510                 if (mode & MAY_WRITE)
2511                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2512                 if (mode & MAY_EXEC)
2513                         args.access |= NFS4_ACCESS_LOOKUP;
2514         } else {
2515                 if (mode & MAY_WRITE)
2516                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2517                 if (mode & MAY_EXEC)
2518                         args.access |= NFS4_ACCESS_EXECUTE;
2519         }
2520
2521         res.fattr = nfs_alloc_fattr();
2522         if (res.fattr == NULL)
2523                 return -ENOMEM;
2524
2525         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2526         if (!status) {
2527                 entry->mask = 0;
2528                 if (res.access & NFS4_ACCESS_READ)
2529                         entry->mask |= MAY_READ;
2530                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2531                         entry->mask |= MAY_WRITE;
2532                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2533                         entry->mask |= MAY_EXEC;
2534                 nfs_refresh_inode(inode, res.fattr);
2535         }
2536         nfs_free_fattr(res.fattr);
2537         return status;
2538 }
2539
2540 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2541 {
2542         struct nfs4_exception exception = { };
2543         int err;
2544         do {
2545                 err = nfs4_handle_exception(NFS_SERVER(inode),
2546                                 _nfs4_proc_access(inode, entry),
2547                                 &exception);
2548         } while (exception.retry);
2549         return err;
2550 }
2551
2552 /*
2553  * TODO: For the time being, we don't try to get any attributes
2554  * along with any of the zero-copy operations READ, READDIR,
2555  * READLINK, WRITE.
2556  *
2557  * In the case of the first three, we want to put the GETATTR
2558  * after the read-type operation -- this is because it is hard
2559  * to predict the length of a GETATTR response in v4, and thus
2560  * align the READ data correctly.  This means that the GETATTR
2561  * may end up partially falling into the page cache, and we should
2562  * shift it into the 'tail' of the xdr_buf before processing.
2563  * To do this efficiently, we need to know the total length
2564  * of data received, which doesn't seem to be available outside
2565  * of the RPC layer.
2566  *
2567  * In the case of WRITE, we also want to put the GETATTR after
2568  * the operation -- in this case because we want to make sure
2569  * we get the post-operation mtime and size.  This means that
2570  * we can't use xdr_encode_pages() as written: we need a variant
2571  * of it which would leave room in the 'tail' iovec.
2572  *
2573  * Both of these changes to the XDR layer would in fact be quite
2574  * minor, but I decided to leave them for a subsequent patch.
2575  */
2576 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2577                 unsigned int pgbase, unsigned int pglen)
2578 {
2579         struct nfs4_readlink args = {
2580                 .fh       = NFS_FH(inode),
2581                 .pgbase   = pgbase,
2582                 .pglen    = pglen,
2583                 .pages    = &page,
2584         };
2585         struct nfs4_readlink_res res;
2586         struct rpc_message msg = {
2587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2588                 .rpc_argp = &args,
2589                 .rpc_resp = &res,
2590         };
2591
2592         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2593 }
2594
2595 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2596                 unsigned int pgbase, unsigned int pglen)
2597 {
2598         struct nfs4_exception exception = { };
2599         int err;
2600         do {
2601                 err = nfs4_handle_exception(NFS_SERVER(inode),
2602                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2603                                 &exception);
2604         } while (exception.retry);
2605         return err;
2606 }
2607
2608 /*
2609  * Got race?
2610  * We will need to arrange for the VFS layer to provide an atomic open.
2611  * Until then, this create/open method is prone to inefficiency and race
2612  * conditions due to the lookup, create, and open VFS calls from sys_open()
2613  * placed on the wire.
2614  *
2615  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2616  * The file will be opened again in the subsequent VFS open call
2617  * (nfs4_proc_file_open).
2618  *
2619  * The open for read will just hang around to be used by any process that
2620  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2621  */
2622
2623 static int
2624 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2625                  int flags, struct nfs_open_context *ctx)
2626 {
2627         struct path my_path = {
2628                 .dentry = dentry,
2629         };
2630         struct path *path = &my_path;
2631         struct nfs4_state *state;
2632         struct rpc_cred *cred = NULL;
2633         fmode_t fmode = 0;
2634         int status = 0;
2635
2636         if (ctx != NULL) {
2637                 cred = ctx->cred;
2638                 path = &ctx->path;
2639                 fmode = ctx->mode;
2640         }
2641         sattr->ia_mode &= ~current_umask();
2642         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2643         d_drop(dentry);
2644         if (IS_ERR(state)) {
2645                 status = PTR_ERR(state);
2646                 goto out;
2647         }
2648         d_add(dentry, igrab(state->inode));
2649         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2650         if (ctx != NULL)
2651                 ctx->state = state;
2652         else
2653                 nfs4_close_sync(path, state, fmode);
2654 out:
2655         return status;
2656 }
2657
2658 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2659 {
2660         struct nfs_server *server = NFS_SERVER(dir);
2661         struct nfs_removeargs args = {
2662                 .fh = NFS_FH(dir),
2663                 .name.len = name->len,
2664                 .name.name = name->name,
2665                 .bitmask = server->attr_bitmask,
2666         };
2667         struct nfs_removeres res = {
2668                 .server = server,
2669         };
2670         struct rpc_message msg = {
2671                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2672                 .rpc_argp = &args,
2673                 .rpc_resp = &res,
2674         };
2675         int status = -ENOMEM;
2676
2677         res.dir_attr = nfs_alloc_fattr();
2678         if (res.dir_attr == NULL)
2679                 goto out;
2680
2681         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2682         if (status == 0) {
2683                 update_changeattr(dir, &res.cinfo);
2684                 nfs_post_op_update_inode(dir, res.dir_attr);
2685         }
2686         nfs_free_fattr(res.dir_attr);
2687 out:
2688         return status;
2689 }
2690
2691 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2692 {
2693         struct nfs4_exception exception = { };
2694         int err;
2695         do {
2696                 err = nfs4_handle_exception(NFS_SERVER(dir),
2697                                 _nfs4_proc_remove(dir, name),
2698                                 &exception);
2699         } while (exception.retry);
2700         return err;
2701 }
2702
2703 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2704 {
2705         struct nfs_server *server = NFS_SERVER(dir);
2706         struct nfs_removeargs *args = msg->rpc_argp;
2707         struct nfs_removeres *res = msg->rpc_resp;
2708
2709         args->bitmask = server->cache_consistency_bitmask;
2710         res->server = server;
2711         res->seq_res.sr_slot = NULL;
2712         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2713 }
2714
2715 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2716 {
2717         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2718
2719         if (!nfs4_sequence_done(task, &res->seq_res))
2720                 return 0;
2721         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2722                 return 0;
2723         update_changeattr(dir, &res->cinfo);
2724         nfs_post_op_update_inode(dir, res->dir_attr);
2725         return 1;
2726 }
2727
2728 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2729 {
2730         struct nfs_server *server = NFS_SERVER(dir);
2731         struct nfs_renameargs *arg = msg->rpc_argp;
2732         struct nfs_renameres *res = msg->rpc_resp;
2733
2734         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2735         arg->bitmask = server->attr_bitmask;
2736         res->server = server;
2737 }
2738
2739 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2740                                  struct inode *new_dir)
2741 {
2742         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2743
2744         if (!nfs4_sequence_done(task, &res->seq_res))
2745                 return 0;
2746         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2747                 return 0;
2748
2749         update_changeattr(old_dir, &res->old_cinfo);
2750         nfs_post_op_update_inode(old_dir, res->old_fattr);
2751         update_changeattr(new_dir, &res->new_cinfo);
2752         nfs_post_op_update_inode(new_dir, res->new_fattr);
2753         return 1;
2754 }
2755
2756 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2757                 struct inode *new_dir, struct qstr *new_name)
2758 {
2759         struct nfs_server *server = NFS_SERVER(old_dir);
2760         struct nfs_renameargs arg = {
2761                 .old_dir = NFS_FH(old_dir),
2762                 .new_dir = NFS_FH(new_dir),
2763                 .old_name = old_name,
2764                 .new_name = new_name,
2765                 .bitmask = server->attr_bitmask,
2766         };
2767         struct nfs_renameres res = {
2768                 .server = server,
2769         };
2770         struct rpc_message msg = {
2771                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2772                 .rpc_argp = &arg,
2773                 .rpc_resp = &res,
2774         };
2775         int status = -ENOMEM;
2776
2777         res.old_fattr = nfs_alloc_fattr();
2778         res.new_fattr = nfs_alloc_fattr();
2779         if (res.old_fattr == NULL || res.new_fattr == NULL)
2780                 goto out;
2781
2782         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2783         if (!status) {
2784                 update_changeattr(old_dir, &res.old_cinfo);
2785                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2786                 update_changeattr(new_dir, &res.new_cinfo);
2787                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2788         }
2789 out:
2790         nfs_free_fattr(res.new_fattr);
2791         nfs_free_fattr(res.old_fattr);
2792         return status;
2793 }
2794
2795 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2796                 struct inode *new_dir, struct qstr *new_name)
2797 {
2798         struct nfs4_exception exception = { };
2799         int err;
2800         do {
2801                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2802                                 _nfs4_proc_rename(old_dir, old_name,
2803                                         new_dir, new_name),
2804                                 &exception);
2805         } while (exception.retry);
2806         return err;
2807 }
2808
2809 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2810 {
2811         struct nfs_server *server = NFS_SERVER(inode);
2812         struct nfs4_link_arg arg = {
2813                 .fh     = NFS_FH(inode),
2814                 .dir_fh = NFS_FH(dir),
2815                 .name   = name,
2816                 .bitmask = server->attr_bitmask,
2817         };
2818         struct nfs4_link_res res = {
2819                 .server = server,
2820         };
2821         struct rpc_message msg = {
2822                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2823                 .rpc_argp = &arg,
2824                 .rpc_resp = &res,
2825         };
2826         int status = -ENOMEM;
2827
2828         res.fattr = nfs_alloc_fattr();
2829         res.dir_attr = nfs_alloc_fattr();
2830         if (res.fattr == NULL || res.dir_attr == NULL)
2831                 goto out;
2832
2833         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2834         if (!status) {
2835                 update_changeattr(dir, &res.cinfo);
2836                 nfs_post_op_update_inode(dir, res.dir_attr);
2837                 nfs_post_op_update_inode(inode, res.fattr);
2838         }
2839 out:
2840         nfs_free_fattr(res.dir_attr);
2841         nfs_free_fattr(res.fattr);
2842         return status;
2843 }
2844
2845 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2846 {
2847         struct nfs4_exception exception = { };
2848         int err;
2849         do {
2850                 err = nfs4_handle_exception(NFS_SERVER(inode),
2851                                 _nfs4_proc_link(inode, dir, name),
2852                                 &exception);
2853         } while (exception.retry);
2854         return err;
2855 }
2856
2857 struct nfs4_createdata {
2858         struct rpc_message msg;
2859         struct nfs4_create_arg arg;
2860         struct nfs4_create_res res;
2861         struct nfs_fh fh;
2862         struct nfs_fattr fattr;
2863         struct nfs_fattr dir_fattr;
2864 };
2865
2866 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2867                 struct qstr *name, struct iattr *sattr, u32 ftype)
2868 {
2869         struct nfs4_createdata *data;
2870
2871         data = kzalloc(sizeof(*data), GFP_KERNEL);
2872         if (data != NULL) {
2873                 struct nfs_server *server = NFS_SERVER(dir);
2874
2875                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2876                 data->msg.rpc_argp = &data->arg;
2877                 data->msg.rpc_resp = &data->res;
2878                 data->arg.dir_fh = NFS_FH(dir);
2879                 data->arg.server = server;
2880                 data->arg.name = name;
2881                 data->arg.attrs = sattr;
2882                 data->arg.ftype = ftype;
2883                 data->arg.bitmask = server->attr_bitmask;
2884                 data->res.server = server;
2885                 data->res.fh = &data->fh;
2886                 data->res.fattr = &data->fattr;
2887                 data->res.dir_fattr = &data->dir_fattr;
2888                 nfs_fattr_init(data->res.fattr);
2889                 nfs_fattr_init(data->res.dir_fattr);
2890         }
2891         return data;
2892 }
2893
2894 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2895 {
2896         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2897                                     &data->arg.seq_args, &data->res.seq_res, 1);
2898         if (status == 0) {
2899                 update_changeattr(dir, &data->res.dir_cinfo);
2900                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2901                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2902         }
2903         return status;
2904 }
2905
2906 static void nfs4_free_createdata(struct nfs4_createdata *data)
2907 {
2908         kfree(data);
2909 }
2910
2911 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2912                 struct page *page, unsigned int len, struct iattr *sattr)
2913 {
2914         struct nfs4_createdata *data;
2915         int status = -ENAMETOOLONG;
2916
2917         if (len > NFS4_MAXPATHLEN)
2918                 goto out;
2919
2920         status = -ENOMEM;
2921         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2922         if (data == NULL)
2923                 goto out;
2924
2925         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2926         data->arg.u.symlink.pages = &page;
2927         data->arg.u.symlink.len = len;
2928
2929         status = nfs4_do_create(dir, dentry, data);
2930
2931         nfs4_free_createdata(data);
2932 out:
2933         return status;
2934 }
2935
2936 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2937                 struct page *page, unsigned int len, struct iattr *sattr)
2938 {
2939         struct nfs4_exception exception = { };
2940         int err;
2941         do {
2942                 err = nfs4_handle_exception(NFS_SERVER(dir),
2943                                 _nfs4_proc_symlink(dir, dentry, page,
2944                                                         len, sattr),
2945                                 &exception);
2946         } while (exception.retry);
2947         return err;
2948 }
2949
2950 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2951                 struct iattr *sattr)
2952 {
2953         struct nfs4_createdata *data;
2954         int status = -ENOMEM;
2955
2956         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2957         if (data == NULL)
2958                 goto out;
2959
2960         status = nfs4_do_create(dir, dentry, data);
2961
2962         nfs4_free_createdata(data);
2963 out:
2964         return status;
2965 }
2966
2967 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2968                 struct iattr *sattr)
2969 {
2970         struct nfs4_exception exception = { };
2971         int err;
2972
2973         sattr->ia_mode &= ~current_umask();
2974         do {
2975                 err = nfs4_handle_exception(NFS_SERVER(dir),
2976                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2977                                 &exception);
2978         } while (exception.retry);
2979         return err;
2980 }
2981
2982 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2983                 u64 cookie, struct page **pages, unsigned int count, int plus)
2984 {
2985         struct inode            *dir = dentry->d_inode;
2986         struct nfs4_readdir_arg args = {
2987                 .fh = NFS_FH(dir),
2988                 .pages = pages,
2989                 .pgbase = 0,
2990                 .count = count,
2991                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2992                 .plus = plus,
2993         };
2994         struct nfs4_readdir_res res;
2995         struct rpc_message msg = {
2996                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2997                 .rpc_argp = &args,
2998                 .rpc_resp = &res,
2999                 .rpc_cred = cred,
3000         };
3001         int                     status;
3002
3003         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3004                         dentry->d_parent->d_name.name,
3005                         dentry->d_name.name,
3006                         (unsigned long long)cookie);
3007         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3008         res.pgbase = args.pgbase;
3009         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3010         if (status >= 0) {
3011                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3012                 status += args.pgbase;
3013         }
3014
3015         nfs_invalidate_atime(dir);
3016
3017         dprintk("%s: returns %d\n", __func__, status);
3018         return status;
3019 }
3020
3021 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3022                 u64 cookie, struct page **pages, unsigned int count, int plus)
3023 {
3024         struct nfs4_exception exception = { };
3025         int err;
3026         do {
3027                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3028                                 _nfs4_proc_readdir(dentry, cred, cookie,
3029                                         pages, count, plus),
3030                                 &exception);
3031         } while (exception.retry);
3032         return err;
3033 }
3034
3035 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3036                 struct iattr *sattr, dev_t rdev)
3037 {
3038         struct nfs4_createdata *data;
3039         int mode = sattr->ia_mode;
3040         int status = -ENOMEM;
3041
3042         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3043         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3044
3045         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3046         if (data == NULL)
3047                 goto out;
3048
3049         if (S_ISFIFO(mode))
3050                 data->arg.ftype = NF4FIFO;
3051         else if (S_ISBLK(mode)) {
3052                 data->arg.ftype = NF4BLK;
3053                 data->arg.u.device.specdata1 = MAJOR(rdev);
3054                 data->arg.u.device.specdata2 = MINOR(rdev);
3055         }
3056         else if (S_ISCHR(mode)) {
3057                 data->arg.ftype = NF4CHR;
3058                 data->arg.u.device.specdata1 = MAJOR(rdev);
3059                 data->arg.u.device.specdata2 = MINOR(rdev);
3060         }
3061
3062         status = nfs4_do_create(dir, dentry, data);
3063
3064         nfs4_free_createdata(data);
3065 out:
3066         return status;
3067 }
3068
3069 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3070                 struct iattr *sattr, dev_t rdev)
3071 {
3072         struct nfs4_exception exception = { };
3073         int err;
3074
3075         sattr->ia_mode &= ~current_umask();
3076         do {
3077                 err = nfs4_handle_exception(NFS_SERVER(dir),
3078                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3079                                 &exception);
3080         } while (exception.retry);
3081         return err;
3082 }
3083
3084 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3085                  struct nfs_fsstat *fsstat)
3086 {
3087         struct nfs4_statfs_arg args = {
3088                 .fh = fhandle,
3089                 .bitmask = server->attr_bitmask,
3090         };
3091         struct nfs4_statfs_res res = {
3092                 .fsstat = fsstat,
3093         };
3094         struct rpc_message msg = {
3095                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3096                 .rpc_argp = &args,
3097                 .rpc_resp = &res,
3098         };
3099
3100         nfs_fattr_init(fsstat->fattr);
3101         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3102 }
3103
3104 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3105 {
3106         struct nfs4_exception exception = { };
3107         int err;
3108         do {
3109                 err = nfs4_handle_exception(server,
3110                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3111                                 &exception);
3112         } while (exception.retry);
3113         return err;
3114 }
3115
3116 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3117                 struct nfs_fsinfo *fsinfo)
3118 {
3119         struct nfs4_fsinfo_arg args = {
3120                 .fh = fhandle,
3121                 .bitmask = server->attr_bitmask,
3122         };
3123         struct nfs4_fsinfo_res res = {
3124                 .fsinfo = fsinfo,
3125         };
3126         struct rpc_message msg = {
3127                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3128                 .rpc_argp = &args,
3129                 .rpc_resp = &res,
3130         };
3131
3132         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3133 }
3134
3135 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3136 {
3137         struct nfs4_exception exception = { };
3138         int err;
3139
3140         do {
3141                 err = nfs4_handle_exception(server,
3142                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3143                                 &exception);
3144         } while (exception.retry);
3145         return err;
3146 }
3147
3148 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3149 {
3150         nfs_fattr_init(fsinfo->fattr);
3151         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3152 }
3153
3154 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3155                 struct nfs_pathconf *pathconf)
3156 {
3157         struct nfs4_pathconf_arg args = {
3158                 .fh = fhandle,
3159                 .bitmask = server->attr_bitmask,
3160         };
3161         struct nfs4_pathconf_res res = {
3162                 .pathconf = pathconf,
3163         };
3164         struct rpc_message msg = {
3165                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3166                 .rpc_argp = &args,
3167                 .rpc_resp = &res,
3168         };
3169
3170         /* None of the pathconf attributes are mandatory to implement */
3171         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3172                 memset(pathconf, 0, sizeof(*pathconf));
3173                 return 0;
3174         }
3175
3176         nfs_fattr_init(pathconf->fattr);
3177         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3178 }
3179
3180 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3181                 struct nfs_pathconf *pathconf)
3182 {
3183         struct nfs4_exception exception = { };
3184         int err;
3185
3186         do {
3187                 err = nfs4_handle_exception(server,
3188                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3189                                 &exception);
3190         } while (exception.retry);
3191         return err;
3192 }
3193
3194 void __nfs4_read_done_cb(struct nfs_read_data *data)
3195 {
3196         nfs_invalidate_atime(data->inode);
3197 }
3198
3199 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3200 {
3201         struct nfs_server *server = NFS_SERVER(data->inode);
3202
3203         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3204                 nfs_restart_rpc(task, server->nfs_client);
3205                 return -EAGAIN;
3206         }
3207
3208         __nfs4_read_done_cb(data);
3209         if (task->tk_status > 0)
3210                 renew_lease(server, data->timestamp);
3211         return 0;
3212 }
3213
3214 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3215 {
3216
3217         dprintk("--> %s\n", __func__);
3218
3219         if (!nfs4_sequence_done(task, &data->res.seq_res))
3220                 return -EAGAIN;
3221
3222         return data->read_done_cb ? data->read_done_cb(task, data) :
3223                                     nfs4_read_done_cb(task, data);
3224 }
3225
3226 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3227 {
3228         data->timestamp   = jiffies;
3229         data->read_done_cb = nfs4_read_done_cb;
3230         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3231 }
3232
3233 /* Reset the the nfs_read_data to send the read to the MDS. */
3234 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3235 {
3236         dprintk("%s Reset task for i/o through\n", __func__);
3237         put_lseg(data->lseg);
3238         data->lseg = NULL;
3239         /* offsets will differ in the dense stripe case */
3240         data->args.offset = data->mds_offset;
3241         data->ds_clp = NULL;
3242         data->args.fh     = NFS_FH(data->inode);
3243         data->read_done_cb = nfs4_read_done_cb;
3244         task->tk_ops = data->mds_ops;
3245         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3246 }
3247 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3248
3249 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3250 {
3251         struct inode *inode = data->inode;
3252
3253         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3254                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3255                 return -EAGAIN;
3256         }
3257         if (task->tk_status >= 0) {
3258                 renew_lease(NFS_SERVER(inode), data->timestamp);
3259                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3260         }
3261         return 0;
3262 }
3263
3264 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3265 {
3266         if (!nfs4_sequence_done(task, &data->res.seq_res))
3267                 return -EAGAIN;
3268         return data->write_done_cb ? data->write_done_cb(task, data) :
3269                 nfs4_write_done_cb(task, data);
3270 }
3271
3272 /* Reset the the nfs_write_data to send the write to the MDS. */
3273 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3274 {
3275         dprintk("%s Reset task for i/o through\n", __func__);
3276         put_lseg(data->lseg);
3277         data->lseg          = NULL;
3278         data->ds_clp        = NULL;
3279         data->write_done_cb = nfs4_write_done_cb;
3280         data->args.fh       = NFS_FH(data->inode);
3281         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3282         data->args.offset   = data->mds_offset;
3283         data->res.fattr     = &data->fattr;
3284         task->tk_ops        = data->mds_ops;
3285         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3286 }
3287 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3288
3289 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3290 {
3291         struct nfs_server *server = NFS_SERVER(data->inode);
3292
3293         if (data->lseg) {
3294                 data->args.bitmask = NULL;
3295                 data->res.fattr = NULL;
3296         } else
3297                 data->args.bitmask = server->cache_consistency_bitmask;
3298         if (!data->write_done_cb)
3299                 data->write_done_cb = nfs4_write_done_cb;
3300         data->res.server = server;
3301         data->timestamp   = jiffies;
3302
3303         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3304 }
3305
3306 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3307 {
3308         struct inode *inode = data->inode;
3309
3310         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3311                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3312                 return -EAGAIN;
3313         }
3314         nfs_refresh_inode(inode, data->res.fattr);
3315         return 0;
3316 }
3317
3318 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3319 {
3320         if (!nfs4_sequence_done(task, &data->res.seq_res))
3321                 return -EAGAIN;
3322         return data->write_done_cb(task, data);
3323 }
3324
3325 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3326 {
3327         struct nfs_server *server = NFS_SERVER(data->inode);
3328
3329         if (data->lseg) {
3330                 data->args.bitmask = NULL;
3331                 data->res.fattr = NULL;
3332         } else
3333                 data->args.bitmask = server->cache_consistency_bitmask;
3334         if (!data->write_done_cb)
3335                 data->write_done_cb = nfs4_commit_done_cb;
3336         data->res.server = server;
3337         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3338 }
3339
3340 struct nfs4_renewdata {
3341         struct nfs_client       *client;
3342         unsigned long           timestamp;
3343 };
3344
3345 /*
3346  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3347  * standalone procedure for queueing an asynchronous RENEW.
3348  */
3349 static void nfs4_renew_release(void *calldata)
3350 {
3351         struct nfs4_renewdata *data = calldata;
3352         struct nfs_client *clp = data->client;
3353
3354         if (atomic_read(&clp->cl_count) > 1)
3355                 nfs4_schedule_state_renewal(clp);
3356         nfs_put_client(clp);
3357         kfree(data);
3358 }
3359
3360 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3361 {
3362         struct nfs4_renewdata *data = calldata;
3363         struct nfs_client *clp = data->client;
3364         unsigned long timestamp = data->timestamp;
3365
3366         if (task->tk_status < 0) {
3367                 /* Unless we're shutting down, schedule state recovery! */
3368                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3369                         nfs4_schedule_lease_recovery(clp);
3370                 return;
3371         }
3372         do_renew_lease(clp, timestamp);
3373 }
3374
3375 static const struct rpc_call_ops nfs4_renew_ops = {
3376         .rpc_call_done = nfs4_renew_done,
3377         .rpc_release = nfs4_renew_release,
3378 };
3379
3380 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3381 {
3382         struct rpc_message msg = {
3383                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3384                 .rpc_argp       = clp,
3385                 .rpc_cred       = cred,
3386         };
3387         struct nfs4_renewdata *data;
3388
3389         if (!atomic_inc_not_zero(&clp->cl_count))
3390                 return -EIO;
3391         data = kmalloc(sizeof(*data), GFP_KERNEL);
3392         if (data == NULL)
3393                 return -ENOMEM;
3394         data->client = clp;
3395         data->timestamp = jiffies;
3396         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3397                         &nfs4_renew_ops, data);
3398 }
3399
3400 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3401 {
3402         struct rpc_message msg = {
3403                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3404                 .rpc_argp       = clp,
3405                 .rpc_cred       = cred,
3406         };
3407         unsigned long now = jiffies;
3408         int status;
3409
3410         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3411         if (status < 0)
3412                 return status;
3413         do_renew_lease(clp, now);
3414         return 0;
3415 }
3416
3417 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3418 {
3419         return (server->caps & NFS_CAP_ACLS)
3420                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3421                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3422 }
3423
3424 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3425  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3426  * the stack.
3427  */
3428 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3429
3430 static void buf_to_pages(const void *buf, size_t buflen,
3431                 struct page **pages, unsigned int *pgbase)
3432 {
3433         const void *p = buf;
3434
3435         *pgbase = offset_in_page(buf);
3436         p -= *pgbase;
3437         while (p < buf + buflen) {
3438                 *(pages++) = virt_to_page(p);
3439                 p += PAGE_CACHE_SIZE;
3440         }
3441 }
3442
3443 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3444                 struct page **pages, unsigned int *pgbase)
3445 {
3446         struct page *newpage, **spages;
3447         int rc = 0;
3448         size_t len;
3449         spages = pages;
3450
3451         do {
3452                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3453                 newpage = alloc_page(GFP_KERNEL);
3454
3455                 if (newpage == NULL)
3456                         goto unwind;
3457                 memcpy(page_address(newpage), buf, len);
3458                 buf += len;
3459                 buflen -= len;
3460                 *pages++ = newpage;
3461                 rc++;
3462         } while (buflen != 0);
3463
3464         return rc;
3465
3466 unwind:
3467         for(; rc > 0; rc--)
3468                 __free_page(spages[rc-1]);
3469         return -ENOMEM;
3470 }
3471
3472 struct nfs4_cached_acl {
3473         int cached;
3474         size_t len;
3475         char data[0];
3476 };
3477
3478 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3479 {
3480         struct nfs_inode *nfsi = NFS_I(inode);
3481
3482         spin_lock(&inode->i_lock);
3483         kfree(nfsi->nfs4_acl);
3484         nfsi->nfs4_acl = acl;
3485         spin_unlock(&inode->i_lock);
3486 }
3487
3488 static void nfs4_zap_acl_attr(struct inode *inode)
3489 {
3490         nfs4_set_cached_acl(inode, NULL);
3491 }
3492
3493 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3494 {
3495         struct nfs_inode *nfsi = NFS_I(inode);
3496         struct nfs4_cached_acl *acl;
3497         int ret = -ENOENT;
3498
3499         spin_lock(&inode->i_lock);
3500         acl = nfsi->nfs4_acl;
3501         if (acl == NULL)
3502                 goto out;
3503         if (buf == NULL) /* user is just asking for length */
3504                 goto out_len;
3505         if (acl->cached == 0)
3506                 goto out;
3507         ret = -ERANGE; /* see getxattr(2) man page */
3508         if (acl->len > buflen)
3509                 goto out;
3510         memcpy(buf, acl->data, acl->len);
3511 out_len:
3512         ret = acl->len;
3513 out:
3514         spin_unlock(&inode->i_lock);
3515         return ret;
3516 }
3517
3518 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3519 {
3520         struct nfs4_cached_acl *acl;
3521
3522         if (buf && acl_len <= PAGE_SIZE) {
3523                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3524                 if (acl == NULL)
3525                         goto out;
3526                 acl->cached = 1;
3527                 memcpy(acl->data, buf, acl_len);
3528         } else {
3529                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3530                 if (acl == NULL)
3531                         goto out;
3532                 acl->cached = 0;
3533         }
3534         acl->len = acl_len;
3535 out:
3536         nfs4_set_cached_acl(inode, acl);
3537 }
3538
3539 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3540 {
3541         struct page *pages[NFS4ACL_MAXPAGES];
3542         struct nfs_getaclargs args = {
3543                 .fh = NFS_FH(inode),
3544                 .acl_pages = pages,
3545                 .acl_len = buflen,
3546         };
3547         struct nfs_getaclres res = {
3548                 .acl_len = buflen,
3549         };
3550         void *resp_buf;
3551         struct rpc_message msg = {
3552                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3553                 .rpc_argp = &args,
3554                 .rpc_resp = &res,
3555         };
3556         struct page *localpage = NULL;
3557         int ret;
3558
3559         if (buflen < PAGE_SIZE) {
3560                 /* As long as we're doing a round trip to the server anyway,
3561                  * let's be prepared for a page of acl data. */
3562                 localpage = alloc_page(GFP_KERNEL);
3563                 resp_buf = page_address(localpage);
3564                 if (localpage == NULL)
3565                         return -ENOMEM;
3566                 args.acl_pages[0] = localpage;
3567                 args.acl_pgbase = 0;
3568                 args.acl_len = PAGE_SIZE;
3569         } else {
3570                 resp_buf = buf;
3571                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3572         }
3573         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3574         if (ret)
3575                 goto out_free;
3576         if (res.acl_len > args.acl_len)
3577                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3578         else
3579                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3580         if (buf) {
3581                 ret = -ERANGE;
3582                 if (res.acl_len > buflen)
3583                         goto out_free;
3584                 if (localpage)
3585                         memcpy(buf, resp_buf, res.acl_len);
3586         }
3587         ret = res.acl_len;
3588 out_free:
3589         if (localpage)
3590                 __free_page(localpage);
3591         return ret;
3592 }
3593
3594 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3595 {
3596         struct nfs4_exception exception = { };
3597         ssize_t ret;
3598         do {
3599                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3600                 if (ret >= 0)
3601                         break;
3602                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3603         } while (exception.retry);
3604         return ret;
3605 }
3606
3607 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3608 {
3609         struct nfs_server *server = NFS_SERVER(inode);
3610         int ret;
3611
3612         if (!nfs4_server_supports_acls(server))
3613                 return -EOPNOTSUPP;
3614         ret = nfs_revalidate_inode(server, inode);
3615         if (ret < 0)
3616                 return ret;
3617         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3618                 nfs_zap_acl_cache(inode);
3619         ret = nfs4_read_cached_acl(inode, buf, buflen);
3620         if (ret != -ENOENT)
3621                 return ret;
3622         return nfs4_get_acl_uncached(inode, buf, buflen);
3623 }
3624
3625 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3626 {
3627         struct nfs_server *server = NFS_SERVER(inode);
3628         struct page *pages[NFS4ACL_MAXPAGES];
3629         struct nfs_setaclargs arg = {
3630                 .fh             = NFS_FH(inode),
3631                 .acl_pages      = pages,
3632                 .acl_len        = buflen,
3633         };
3634         struct nfs_setaclres res;
3635         struct rpc_message msg = {
3636                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3637                 .rpc_argp       = &arg,
3638                 .rpc_resp       = &res,
3639         };
3640         int ret, i;
3641
3642         if (!nfs4_server_supports_acls(server))
3643                 return -EOPNOTSUPP;
3644         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3645         if (i < 0)
3646                 return i;
3647         nfs_inode_return_delegation(inode);
3648         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3649
3650         /*
3651          * Free each page after tx, so the only ref left is
3652          * held by the network stack
3653          */
3654         for (; i > 0; i--)
3655                 put_page(pages[i-1]);
3656
3657         /*
3658          * Acl update can result in inode attribute update.
3659          * so mark the attribute cache invalid.
3660          */
3661         spin_lock(&inode->i_lock);
3662         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3663         spin_unlock(&inode->i_lock);
3664         nfs_access_zap_cache(inode);
3665         nfs_zap_acl_cache(inode);
3666         return ret;
3667 }
3668
3669 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3670 {
3671         struct nfs4_exception exception = { };
3672         int err;
3673         do {
3674                 err = nfs4_handle_exception(NFS_SERVER(inode),
3675                                 __nfs4_proc_set_acl(inode, buf, buflen),
3676                                 &exception);
3677         } while (exception.retry);
3678         return err;
3679 }
3680
3681 static int
3682 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3683 {
3684         struct nfs_client *clp = server->nfs_client;
3685
3686         if (task->tk_status >= 0)
3687                 return 0;
3688         switch(task->tk_status) {
3689                 case -NFS4ERR_DELEG_REVOKED:
3690                 case -NFS4ERR_ADMIN_REVOKED:
3691                 case -NFS4ERR_BAD_STATEID:
3692                         if (state != NULL)
3693                                 nfs_remove_bad_delegation(state->inode);
3694                 case -NFS4ERR_OPENMODE:
3695                         if (state == NULL)
3696                                 break;
3697                         nfs4_schedule_stateid_recovery(server, state);
3698                         goto wait_on_recovery;
3699                 case -NFS4ERR_EXPIRED:
3700                         if (state != NULL)
3701                                 nfs4_schedule_stateid_recovery(server, state);
3702                 case -NFS4ERR_STALE_STATEID:
3703                 case -NFS4ERR_STALE_CLIENTID:
3704                         nfs4_schedule_lease_recovery(clp);
3705                         goto wait_on_recovery;
3706 #if defined(CONFIG_NFS_V4_1)
3707                 case -NFS4ERR_BADSESSION:
3708                 case -NFS4ERR_BADSLOT:
3709                 case -NFS4ERR_BAD_HIGH_SLOT:
3710                 case -NFS4ERR_DEADSESSION:
3711                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3712                 case -NFS4ERR_SEQ_FALSE_RETRY:
3713                 case -NFS4ERR_SEQ_MISORDERED:
3714                         dprintk("%s ERROR %d, Reset session\n", __func__,
3715                                 task->tk_status);
3716                         nfs4_schedule_session_recovery(clp->cl_session);
3717                         task->tk_status = 0;
3718                         return -EAGAIN;
3719 #endif /* CONFIG_NFS_V4_1 */
3720                 case -NFS4ERR_DELAY:
3721                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3722                 case -NFS4ERR_GRACE:
3723                 case -EKEYEXPIRED:
3724                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3725                         task->tk_status = 0;
3726                         return -EAGAIN;
3727                 case -NFS4ERR_RETRY_UNCACHED_REP:
3728                 case -NFS4ERR_OLD_STATEID:
3729                         task->tk_status = 0;
3730                         return -EAGAIN;
3731         }
3732         task->tk_status = nfs4_map_errors(task->tk_status);
3733         return 0;
3734 wait_on_recovery:
3735         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3736         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3737                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3738         task->tk_status = 0;
3739         return -EAGAIN;
3740 }
3741
3742 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3743                 unsigned short port, struct rpc_cred *cred,
3744                 struct nfs4_setclientid_res *res)
3745 {
3746         nfs4_verifier sc_verifier;
3747         struct nfs4_setclientid setclientid = {
3748                 .sc_verifier = &sc_verifier,
3749                 .sc_prog = program,
3750                 .sc_cb_ident = clp->cl_cb_ident,
3751         };
3752         struct rpc_message msg = {
3753                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3754                 .rpc_argp = &setclientid,
3755                 .rpc_resp = res,
3756                 .rpc_cred = cred,
3757         };
3758         __be32 *p;
3759         int loop = 0;
3760         int status;
3761
3762         p = (__be32*)sc_verifier.data;
3763         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3764         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3765
3766         for(;;) {
3767                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3768                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3769                                 clp->cl_ipaddr,
3770                                 rpc_peeraddr2str(clp->cl_rpcclient,
3771                                                         RPC_DISPLAY_ADDR),
3772                                 rpc_peeraddr2str(clp->cl_rpcclient,
3773                                                         RPC_DISPLAY_PROTO),
3774                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3775                                 clp->cl_id_uniquifier);
3776                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3777                                 sizeof(setclientid.sc_netid),
3778                                 rpc_peeraddr2str(clp->cl_rpcclient,
3779                                                         RPC_DISPLAY_NETID));
3780                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3781                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3782                                 clp->cl_ipaddr, port >> 8, port & 255);
3783
3784                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3785                 if (status != -NFS4ERR_CLID_INUSE)
3786                         break;
3787                 if (loop != 0) {
3788                         ++clp->cl_id_uniquifier;
3789                         break;
3790                 }
3791                 ++loop;
3792                 ssleep(clp->cl_lease_time / HZ + 1);
3793         }
3794         return status;
3795 }
3796
3797 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3798                 struct nfs4_setclientid_res *arg,
3799                 struct rpc_cred *cred)
3800 {
3801         struct nfs_fsinfo fsinfo;
3802         struct rpc_message msg = {
3803                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3804                 .rpc_argp = arg,
3805                 .rpc_resp = &fsinfo,
3806                 .rpc_cred = cred,
3807         };
3808         unsigned long now;
3809         int status;
3810
3811         now = jiffies;
3812         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3813         if (status == 0) {
3814                 spin_lock(&clp->cl_lock);
3815                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3816                 clp->cl_last_renewal = now;
3817                 spin_unlock(&clp->cl_lock);
3818         }
3819         return status;
3820 }
3821
3822 struct nfs4_delegreturndata {
3823         struct nfs4_delegreturnargs args;
3824         struct nfs4_delegreturnres res;
3825         struct nfs_fh fh;
3826         nfs4_stateid stateid;
3827         unsigned long timestamp;
3828         struct nfs_fattr fattr;
3829         int rpc_status;
3830 };
3831
3832 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3833 {
3834         struct nfs4_delegreturndata *data = calldata;
3835
3836         if (!nfs4_sequence_done(task, &data->res.seq_res))
3837                 return;
3838
3839         switch (task->tk_status) {
3840         case -NFS4ERR_STALE_STATEID:
3841         case -NFS4ERR_EXPIRED:
3842         case 0:
3843                 renew_lease(data->res.server, data->timestamp);
3844                 break;
3845         default:
3846                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3847                                 -EAGAIN) {
3848                         nfs_restart_rpc(task, data->res.server->nfs_client);
3849                         return;
3850                 }
3851         }
3852         data->rpc_status = task->tk_status;
3853 }
3854
3855 static void nfs4_delegreturn_release(void *calldata)
3856 {
3857         kfree(calldata);
3858 }
3859
3860 #if defined(CONFIG_NFS_V4_1)
3861 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3862 {
3863         struct nfs4_delegreturndata *d_data;
3864
3865         d_data = (struct nfs4_delegreturndata *)data;
3866
3867         if (nfs4_setup_sequence(d_data->res.server,
3868                                 &d_data->args.seq_args,
3869                                 &d_data->res.seq_res, 1, task))
3870                 return;
3871         rpc_call_start(task);
3872 }
3873 #endif /* CONFIG_NFS_V4_1 */
3874
3875 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3876 #if defined(CONFIG_NFS_V4_1)
3877         .rpc_call_prepare = nfs4_delegreturn_prepare,
3878 #endif /* CONFIG_NFS_V4_1 */
3879         .rpc_call_done = nfs4_delegreturn_done,
3880         .rpc_release = nfs4_delegreturn_release,
3881 };
3882
3883 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3884 {
3885         struct nfs4_delegreturndata *data;
3886         struct nfs_server *server = NFS_SERVER(inode);
3887         struct rpc_task *task;
3888         struct rpc_message msg = {
3889                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3890                 .rpc_cred = cred,
3891         };
3892         struct rpc_task_setup task_setup_data = {
3893                 .rpc_client = server->client,
3894                 .rpc_message = &msg,
3895                 .callback_ops = &nfs4_delegreturn_ops,
3896                 .flags = RPC_TASK_ASYNC,
3897         };
3898         int status = 0;
3899
3900         data = kzalloc(sizeof(*data), GFP_NOFS);
3901         if (data == NULL)
3902                 return -ENOMEM;
3903         data->args.fhandle = &data->fh;
3904         data->args.stateid = &data->stateid;
3905         data->args.bitmask = server->attr_bitmask;
3906         nfs_copy_fh(&data->fh, NFS_FH(inode));
3907         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3908         data->res.fattr = &data->fattr;
3909         data->res.server = server;
3910         nfs_fattr_init(data->res.fattr);
3911         data->timestamp = jiffies;
3912         data->rpc_status = 0;
3913
3914         task_setup_data.callback_data = data;
3915         msg.rpc_argp = &data->args;
3916         msg.rpc_resp = &data->res;
3917         task = rpc_run_task(&task_setup_data);
3918         if (IS_ERR(task))
3919                 return PTR_ERR(task);
3920         if (!issync)
3921                 goto out;
3922         status = nfs4_wait_for_completion_rpc_task(task);
3923         if (status != 0)
3924                 goto out;
3925         status = data->rpc_status;
3926         if (status != 0)
3927                 goto out;
3928         nfs_refresh_inode(inode, &data->fattr);
3929 out:
3930         rpc_put_task(task);
3931         return status;
3932 }
3933
3934 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3935 {
3936         struct nfs_server *server = NFS_SERVER(inode);
3937         struct nfs4_exception exception = { };
3938         int err;
3939         do {
3940                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3941                 switch (err) {
3942                         case -NFS4ERR_STALE_STATEID:
3943                         case -NFS4ERR_EXPIRED:
3944                         case 0:
3945                                 return 0;
3946                 }
3947                 err = nfs4_handle_exception(server, err, &exception);
3948         } while (exception.retry);
3949         return err;
3950 }
3951
3952 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3953 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3954
3955 /*
3956  * sleep, with exponential backoff, and retry the LOCK operation.
3957  */
3958 static unsigned long
3959 nfs4_set_lock_task_retry(unsigned long timeout)
3960 {
3961         schedule_timeout_killable(timeout);
3962         timeout <<= 1;
3963         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3964                 return NFS4_LOCK_MAXTIMEOUT;
3965         return timeout;
3966 }
3967
3968 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3969 {
3970         struct inode *inode = state->inode;
3971         struct nfs_server *server = NFS_SERVER(inode);
3972         struct nfs_client *clp = server->nfs_client;
3973         struct nfs_lockt_args arg = {
3974                 .fh = NFS_FH(inode),
3975                 .fl = request,
3976         };
3977         struct nfs_lockt_res res = {
3978                 .denied = request,
3979         };
3980         struct rpc_message msg = {
3981                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3982                 .rpc_argp       = &arg,
3983                 .rpc_resp       = &res,
3984                 .rpc_cred       = state->owner->so_cred,
3985         };
3986         struct nfs4_lock_state *lsp;
3987         int status;
3988
3989         arg.lock_owner.clientid = clp->cl_clientid;
3990         status = nfs4_set_lock_state(state, request);
3991         if (status != 0)
3992                 goto out;
3993         lsp = request->fl_u.nfs4_fl.owner;
3994         arg.lock_owner.id = lsp->ls_id.id;
3995         arg.lock_owner.s_dev = server->s_dev;
3996         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3997         switch (status) {
3998                 case 0:
3999                         request->fl_type = F_UNLCK;
4000                         break;
4001                 case -NFS4ERR_DENIED:
4002                         status = 0;
4003         }
4004         request->fl_ops->fl_release_private(request);
4005 out:
4006         return status;
4007 }
4008
4009 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4010 {
4011         struct nfs4_exception exception = { };
4012         int err;
4013
4014         do {
4015                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4016                                 _nfs4_proc_getlk(state, cmd, request),
4017                                 &exception);
4018         } while (exception.retry);
4019         return err;
4020 }
4021
4022 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4023 {
4024         int res = 0;
4025         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4026                 case FL_POSIX:
4027                         res = posix_lock_file_wait(file, fl);
4028                         break;
4029                 case FL_FLOCK:
4030                         res = flock_lock_file_wait(file, fl);
4031                         break;
4032                 default:
4033                         BUG();
4034         }
4035         return res;
4036 }
4037
4038 struct nfs4_unlockdata {
4039         struct nfs_locku_args arg;
4040         struct nfs_locku_res res;
4041         struct nfs4_lock_state *lsp;
4042         struct nfs_open_context *ctx;
4043         struct file_lock fl;
4044         const struct nfs_server *server;
4045         unsigned long timestamp;
4046 };
4047
4048 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4049                 struct nfs_open_context *ctx,
4050                 struct nfs4_lock_state *lsp,
4051                 struct nfs_seqid *seqid)
4052 {
4053         struct nfs4_unlockdata *p;
4054         struct inode *inode = lsp->ls_state->inode;
4055
4056         p = kzalloc(sizeof(*p), GFP_NOFS);
4057         if (p == NULL)
4058                 return NULL;
4059         p->arg.fh = NFS_FH(inode);
4060         p->arg.fl = &p->fl;
4061         p->arg.seqid = seqid;
4062         p->res.seqid = seqid;
4063         p->arg.stateid = &lsp->ls_stateid;
4064         p->lsp = lsp;
4065         atomic_inc(&lsp->ls_count);
4066         /* Ensure we don't close file until we're done freeing locks! */
4067         p->ctx = get_nfs_open_context(ctx);
4068         memcpy(&p->fl, fl, sizeof(p->fl));
4069         p->server = NFS_SERVER(inode);
4070         return p;
4071 }
4072
4073 static void nfs4_locku_release_calldata(void *data)
4074 {
4075         struct nfs4_unlockdata *calldata = data;
4076         nfs_free_seqid(calldata->arg.seqid);
4077         nfs4_put_lock_state(calldata->lsp);
4078         put_nfs_open_context(calldata->ctx);
4079         kfree(calldata);
4080 }
4081
4082 static void nfs4_locku_done(struct rpc_task *task, void *data)
4083 {
4084         struct nfs4_unlockdata *calldata = data;
4085
4086         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4087                 return;
4088         switch (task->tk_status) {
4089                 case 0:
4090                         memcpy(calldata->lsp->ls_stateid.data,
4091                                         calldata->res.stateid.data,
4092                                         sizeof(calldata->lsp->ls_stateid.data));
4093                         renew_lease(calldata->server, calldata->timestamp);
4094                         break;
4095                 case -NFS4ERR_BAD_STATEID:
4096                 case -NFS4ERR_OLD_STATEID:
4097                 case -NFS4ERR_STALE_STATEID:
4098                 case -NFS4ERR_EXPIRED:
4099                         break;
4100                 default:
4101                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4102                                 nfs_restart_rpc(task,
4103                                                  calldata->server->nfs_client);
4104         }
4105 }
4106
4107 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4108 {
4109         struct nfs4_unlockdata *calldata = data;
4110
4111         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4112                 return;
4113         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4114                 /* Note: exit _without_ running nfs4_locku_done */
4115                 task->tk_action = NULL;
4116                 return;
4117         }
4118         calldata->timestamp = jiffies;
4119         if (nfs4_setup_sequence(calldata->server,
4120                                 &calldata->arg.seq_args,
4121                                 &calldata->res.seq_res, 1, task))
4122                 return;
4123         rpc_call_start(task);
4124 }
4125
4126 static const struct rpc_call_ops nfs4_locku_ops = {
4127         .rpc_call_prepare = nfs4_locku_prepare,
4128         .rpc_call_done = nfs4_locku_done,
4129         .rpc_release = nfs4_locku_release_calldata,
4130 };
4131
4132 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4133                 struct nfs_open_context *ctx,
4134                 struct nfs4_lock_state *lsp,
4135                 struct nfs_seqid *seqid)
4136 {
4137         struct nfs4_unlockdata *data;
4138         struct rpc_message msg = {
4139                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4140                 .rpc_cred = ctx->cred,
4141         };
4142         struct rpc_task_setup task_setup_data = {
4143                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4144                 .rpc_message = &msg,
4145                 .callback_ops = &nfs4_locku_ops,
4146                 .workqueue = nfsiod_workqueue,
4147                 .flags = RPC_TASK_ASYNC,
4148         };
4149
4150         /* Ensure this is an unlock - when canceling a lock, the
4151          * canceled lock is passed in, and it won't be an unlock.
4152          */
4153         fl->fl_type = F_UNLCK;
4154
4155         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4156         if (data == NULL) {
4157                 nfs_free_seqid(seqid);
4158                 return ERR_PTR(-ENOMEM);
4159         }
4160
4161         msg.rpc_argp = &data->arg;
4162         msg.rpc_resp = &data->res;
4163         task_setup_data.callback_data = data;
4164         return rpc_run_task(&task_setup_data);
4165 }
4166
4167 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4168 {
4169         struct nfs_inode *nfsi = NFS_I(state->inode);
4170         struct nfs_seqid *seqid;
4171         struct nfs4_lock_state *lsp;
4172         struct rpc_task *task;
4173         int status = 0;
4174         unsigned char fl_flags = request->fl_flags;
4175
4176         status = nfs4_set_lock_state(state, request);
4177         /* Unlock _before_ we do the RPC call */
4178         request->fl_flags |= FL_EXISTS;
4179         down_read(&nfsi->rwsem);
4180         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4181                 up_read(&nfsi->rwsem);
4182                 goto out;
4183         }
4184         up_read(&nfsi->rwsem);
4185         if (status != 0)
4186                 goto out;
4187         /* Is this a delegated lock? */
4188         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4189                 goto out;
4190         lsp = request->fl_u.nfs4_fl.owner;
4191         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4192         status = -ENOMEM;
4193         if (seqid == NULL)
4194                 goto out;
4195         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4196         status = PTR_ERR(task);
4197         if (IS_ERR(task))
4198                 goto out;
4199         status = nfs4_wait_for_completion_rpc_task(task);
4200         rpc_put_task(task);
4201 out:
4202         request->fl_flags = fl_flags;
4203         return status;
4204 }
4205
4206 struct nfs4_lockdata {
4207         struct nfs_lock_args arg;
4208         struct nfs_lock_res res;
4209         struct nfs4_lock_state *lsp;
4210         struct nfs_open_context *ctx;
4211         struct file_lock fl;
4212         unsigned long timestamp;
4213         int rpc_status;
4214         int cancelled;
4215         struct nfs_server *server;
4216 };
4217
4218 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4219                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4220                 gfp_t gfp_mask)
4221 {
4222         struct nfs4_lockdata *p;
4223         struct inode *inode = lsp->ls_state->inode;
4224         struct nfs_server *server = NFS_SERVER(inode);
4225
4226         p = kzalloc(sizeof(*p), gfp_mask);
4227         if (p == NULL)
4228                 return NULL;
4229
4230         p->arg.fh = NFS_FH(inode);
4231         p->arg.fl = &p->fl;
4232         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4233         if (p->arg.open_seqid == NULL)
4234                 goto out_free;
4235         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4236         if (p->arg.lock_seqid == NULL)
4237                 goto out_free_seqid;
4238         p->arg.lock_stateid = &lsp->ls_stateid;
4239         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4240         p->arg.lock_owner.id = lsp->ls_id.id;
4241         p->arg.lock_owner.s_dev = server->s_dev;
4242         p->res.lock_seqid = p->arg.lock_seqid;
4243         p->lsp = lsp;
4244         p->server = server;
4245         atomic_inc(&lsp->ls_count);
4246         p->ctx = get_nfs_open_context(ctx);
4247         memcpy(&p->fl, fl, sizeof(p->fl));
4248         return p;
4249 out_free_seqid:
4250         nfs_free_seqid(p->arg.open_seqid);
4251 out_free:
4252         kfree(p);
4253         return NULL;
4254 }
4255
4256 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4257 {
4258         struct nfs4_lockdata *data = calldata;
4259         struct nfs4_state *state = data->lsp->ls_state;
4260
4261         dprintk("%s: begin!\n", __func__);
4262         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4263                 return;
4264         /* Do we need to do an open_to_lock_owner? */
4265         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4266                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4267                         return;
4268                 data->arg.open_stateid = &state->stateid;
4269                 data->arg.new_lock_owner = 1;
4270                 data->res.open_seqid = data->arg.open_seqid;
4271         } else
4272                 data->arg.new_lock_owner = 0;
4273         data->timestamp = jiffies;
4274         if (nfs4_setup_sequence(data->server,
4275                                 &data->arg.seq_args,
4276                                 &data->res.seq_res, 1, task))
4277                 return;
4278         rpc_call_start(task);
4279         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4280 }
4281
4282 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4283 {
4284         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4285         nfs4_lock_prepare(task, calldata);
4286 }
4287
4288 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4289 {
4290         struct nfs4_lockdata *data = calldata;
4291
4292         dprintk("%s: begin!\n", __func__);
4293
4294         if (!nfs4_sequence_done(task, &data->res.seq_res))
4295                 return;
4296
4297         data->rpc_status = task->tk_status;
4298         if (data->arg.new_lock_owner != 0) {
4299                 if (data->rpc_status == 0)
4300                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4301                 else
4302                         goto out;
4303         }
4304         if (data->rpc_status == 0) {
4305                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4306                                         sizeof(data->lsp->ls_stateid.data));
4307                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4308                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4309         }
4310 out:
4311         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4312 }
4313
4314 static void nfs4_lock_release(void *calldata)
4315 {
4316         struct nfs4_lockdata *data = calldata;
4317
4318         dprintk("%s: begin!\n", __func__);
4319         nfs_free_seqid(data->arg.open_seqid);
4320         if (data->cancelled != 0) {
4321                 struct rpc_task *task;
4322                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4323                                 data->arg.lock_seqid);
4324                 if (!IS_ERR(task))
4325                         rpc_put_task_async(task);
4326                 dprintk("%s: cancelling lock!\n", __func__);
4327         } else
4328                 nfs_free_seqid(data->arg.lock_seqid);
4329         nfs4_put_lock_state(data->lsp);
4330         put_nfs_open_context(data->ctx);
4331         kfree(data);
4332         dprintk("%s: done!\n", __func__);
4333 }
4334
4335 static const struct rpc_call_ops nfs4_lock_ops = {
4336         .rpc_call_prepare = nfs4_lock_prepare,
4337         .rpc_call_done = nfs4_lock_done,
4338         .rpc_release = nfs4_lock_release,
4339 };
4340
4341 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4342         .rpc_call_prepare = nfs4_recover_lock_prepare,
4343         .rpc_call_done = nfs4_lock_done,
4344         .rpc_release = nfs4_lock_release,
4345 };
4346
4347 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4348 {
4349         switch (error) {
4350         case -NFS4ERR_ADMIN_REVOKED:
4351         case -NFS4ERR_BAD_STATEID:
4352                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4353                 if (new_lock_owner != 0 ||
4354                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4355                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4356                 break;
4357         case -NFS4ERR_STALE_STATEID:
4358                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4359         case -NFS4ERR_EXPIRED:
4360                 nfs4_schedule_lease_recovery(server->nfs_client);
4361         };
4362 }
4363
4364 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4365 {
4366         struct nfs4_lockdata *data;
4367         struct rpc_task *task;
4368         struct rpc_message msg = {
4369                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4370                 .rpc_cred = state->owner->so_cred,
4371         };
4372         struct rpc_task_setup task_setup_data = {
4373                 .rpc_client = NFS_CLIENT(state->inode),
4374                 .rpc_message = &msg,
4375                 .callback_ops = &nfs4_lock_ops,
4376                 .workqueue = nfsiod_workqueue,
4377                 .flags = RPC_TASK_ASYNC,
4378         };
4379         int ret;
4380
4381         dprintk("%s: begin!\n", __func__);
4382         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4383                         fl->fl_u.nfs4_fl.owner,
4384                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4385         if (data == NULL)
4386                 return -ENOMEM;
4387         if (IS_SETLKW(cmd))
4388                 data->arg.block = 1;
4389         if (recovery_type > NFS_LOCK_NEW) {
4390                 if (recovery_type == NFS_LOCK_RECLAIM)
4391                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4392                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4393         }
4394         msg.rpc_argp = &data->arg;
4395         msg.rpc_resp = &data->res;
4396         task_setup_data.callback_data = data;
4397         task = rpc_run_task(&task_setup_data);
4398         if (IS_ERR(task))
4399                 return PTR_ERR(task);
4400         ret = nfs4_wait_for_completion_rpc_task(task);
4401         if (ret == 0) {
4402                 ret = data->rpc_status;
4403                 if (ret)
4404                         nfs4_handle_setlk_error(data->server, data->lsp,
4405                                         data->arg.new_lock_owner, ret);
4406         } else
4407                 data->cancelled = 1;
4408         rpc_put_task(task);
4409         dprintk("%s: done, ret = %d!\n", __func__, ret);
4410         return ret;
4411 }
4412
4413 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4414 {
4415         struct nfs_server *server = NFS_SERVER(state->inode);
4416         struct nfs4_exception exception = { };
4417         int err;
4418
4419         do {
4420                 /* Cache the lock if possible... */
4421                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4422                         return 0;
4423                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4424                 if (err != -NFS4ERR_DELAY)
4425                         break;
4426                 nfs4_handle_exception(server, err, &exception);
4427         } while (exception.retry);
4428         return err;
4429 }
4430
4431 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4432 {
4433         struct nfs_server *server = NFS_SERVER(state->inode);
4434         struct nfs4_exception exception = { };
4435         int err;
4436
4437         err = nfs4_set_lock_state(state, request);
4438         if (err != 0)
4439                 return err;
4440         do {
4441                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4442                         return 0;
4443                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4444                 switch (err) {
4445                 default:
4446                         goto out;
4447                 case -NFS4ERR_GRACE:
4448                 case -NFS4ERR_DELAY:
4449                         nfs4_handle_exception(server, err, &exception);
4450                         err = 0;
4451                 }
4452         } while (exception.retry);
4453 out:
4454         return err;
4455 }
4456
4457 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4458 {
4459         struct nfs_inode *nfsi = NFS_I(state->inode);
4460         unsigned char fl_flags = request->fl_flags;
4461         int status = -ENOLCK;
4462
4463         if ((fl_flags & FL_POSIX) &&
4464                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4465                 goto out;
4466         /* Is this a delegated open? */
4467         status = nfs4_set_lock_state(state, request);
4468         if (status != 0)
4469                 goto out;
4470         request->fl_flags |= FL_ACCESS;
4471         status = do_vfs_lock(request->fl_file, request);
4472         if (status < 0)
4473                 goto out;
4474         down_read(&nfsi->rwsem);
4475         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4476                 /* Yes: cache locks! */
4477                 /* ...but avoid races with delegation recall... */
4478                 request->fl_flags = fl_flags & ~FL_SLEEP;
4479                 status = do_vfs_lock(request->fl_file, request);
4480                 goto out_unlock;
4481         }
4482         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4483         if (status != 0)
4484                 goto out_unlock;
4485         /* Note: we always want to sleep here! */
4486         request->fl_flags = fl_flags | FL_SLEEP;
4487         if (do_vfs_lock(request->fl_file, request) < 0)
4488                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4489 out_unlock:
4490         up_read(&nfsi->rwsem);
4491 out:
4492         request->fl_flags = fl_flags;
4493         return status;
4494 }
4495
4496 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4497 {
4498         struct nfs4_exception exception = {
4499                 .state = state,
4500         };
4501         int err;
4502
4503         do {
4504                 err = _nfs4_proc_setlk(state, cmd, request);
4505                 if (err == -NFS4ERR_DENIED)
4506                         err = -EAGAIN;
4507                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4508                                 err, &exception);
4509         } while (exception.retry);
4510         return err;
4511 }
4512
4513 static int
4514 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4515 {
4516         struct nfs_open_context *ctx;
4517         struct nfs4_state *state;
4518         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4519         int status;
4520
4521         /* verify open state */
4522         ctx = nfs_file_open_context(filp);
4523         state = ctx->state;
4524
4525         if (request->fl_start < 0 || request->fl_end < 0)
4526                 return -EINVAL;
4527
4528         if (IS_GETLK(cmd)) {
4529                 if (state != NULL)
4530                         return nfs4_proc_getlk(state, F_GETLK, request);
4531                 return 0;
4532         }
4533
4534         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4535                 return -EINVAL;
4536
4537         if (request->fl_type == F_UNLCK) {
4538                 if (state != NULL)
4539                         return nfs4_proc_unlck(state, cmd, request);
4540                 return 0;
4541         }
4542
4543         if (state == NULL)
4544                 return -ENOLCK;
4545         do {
4546                 status = nfs4_proc_setlk(state, cmd, request);
4547                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4548                         break;
4549                 timeout = nfs4_set_lock_task_retry(timeout);
4550                 status = -ERESTARTSYS;
4551                 if (signalled())
4552                         break;
4553         } while(status < 0);
4554         return status;
4555 }
4556
4557 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4558 {
4559         struct nfs_server *server = NFS_SERVER(state->inode);
4560         struct nfs4_exception exception = { };
4561         int err;
4562
4563         err = nfs4_set_lock_state(state, fl);
4564         if (err != 0)
4565                 goto out;
4566         do {
4567                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4568                 switch (err) {
4569                         default:
4570                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4571                                                 __func__, err);
4572                         case 0:
4573                         case -ESTALE:
4574                                 goto out;
4575                         case -NFS4ERR_EXPIRED:
4576                                 nfs4_schedule_stateid_recovery(server, state);
4577                         case -NFS4ERR_STALE_CLIENTID:
4578                         case -NFS4ERR_STALE_STATEID:
4579                                 nfs4_schedule_lease_recovery(server->nfs_client);
4580                                 goto out;
4581                         case -NFS4ERR_BADSESSION:
4582                         case -NFS4ERR_BADSLOT:
4583                         case -NFS4ERR_BAD_HIGH_SLOT:
4584                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4585                         case -NFS4ERR_DEADSESSION:
4586                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4587                                 goto out;
4588                         case -ERESTARTSYS:
4589                                 /*
4590                                  * The show must go on: exit, but mark the
4591                                  * stateid as needing recovery.
4592                                  */
4593                         case -NFS4ERR_DELEG_REVOKED:
4594                         case -NFS4ERR_ADMIN_REVOKED:
4595                         case -NFS4ERR_BAD_STATEID:
4596                         case -NFS4ERR_OPENMODE:
4597                                 nfs4_schedule_stateid_recovery(server, state);
4598                                 err = 0;
4599                                 goto out;
4600                         case -EKEYEXPIRED:
4601                                 /*
4602                                  * User RPCSEC_GSS context has expired.
4603                                  * We cannot recover this stateid now, so
4604                                  * skip it and allow recovery thread to
4605                                  * proceed.
4606                                  */
4607                                 err = 0;
4608                                 goto out;
4609                         case -ENOMEM:
4610                         case -NFS4ERR_DENIED:
4611                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4612                                 err = 0;
4613                                 goto out;
4614                         case -NFS4ERR_DELAY:
4615                                 break;
4616                 }
4617                 err = nfs4_handle_exception(server, err, &exception);
4618         } while (exception.retry);
4619 out:
4620         return err;
4621 }
4622
4623 static void nfs4_release_lockowner_release(void *calldata)
4624 {
4625         kfree(calldata);
4626 }
4627
4628 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4629         .rpc_release = nfs4_release_lockowner_release,
4630 };
4631
4632 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4633 {
4634         struct nfs_server *server = lsp->ls_state->owner->so_server;
4635         struct nfs_release_lockowner_args *args;
4636         struct rpc_message msg = {
4637                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4638         };
4639
4640         if (server->nfs_client->cl_mvops->minor_version != 0)
4641                 return;
4642         args = kmalloc(sizeof(*args), GFP_NOFS);
4643         if (!args)
4644                 return;
4645         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4646         args->lock_owner.id = lsp->ls_id.id;
4647         args->lock_owner.s_dev = server->s_dev;
4648         msg.rpc_argp = args;
4649         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4650 }
4651
4652 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4653
4654 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4655                                    const void *buf, size_t buflen,
4656                                    int flags, int type)
4657 {
4658         if (strcmp(key, "") != 0)
4659                 return -EINVAL;
4660
4661         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4662 }
4663
4664 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4665                                    void *buf, size_t buflen, int type)
4666 {
4667         if (strcmp(key, "") != 0)
4668                 return -EINVAL;
4669
4670         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4671 }
4672
4673 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4674                                        size_t list_len, const char *name,
4675                                        size_t name_len, int type)
4676 {
4677         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4678
4679         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4680                 return 0;
4681
4682         if (list && len <= list_len)
4683                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4684         return len;
4685 }
4686
4687 /*
4688  * nfs_fhget will use either the mounted_on_fileid or the fileid
4689  */
4690 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4691 {
4692         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4693                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4694               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4695               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4696                 return;
4697
4698         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4699                 NFS_ATTR_FATTR_NLINK;
4700         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4701         fattr->nlink = 2;
4702 }
4703
4704 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4705                 struct nfs4_fs_locations *fs_locations, struct page *page)
4706 {
4707         struct nfs_server *server = NFS_SERVER(dir);
4708         u32 bitmask[2] = {
4709                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4710         };
4711         struct nfs4_fs_locations_arg args = {
4712                 .dir_fh = NFS_FH(dir),
4713                 .name = name,
4714                 .page = page,
4715                 .bitmask = bitmask,
4716         };
4717         struct nfs4_fs_locations_res res = {
4718                 .fs_locations = fs_locations,
4719         };
4720         struct rpc_message msg = {
4721                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4722                 .rpc_argp = &args,
4723                 .rpc_resp = &res,
4724         };
4725         int status;
4726
4727         dprintk("%s: start\n", __func__);
4728
4729         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4730          * is not supported */
4731         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4732                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4733         else
4734                 bitmask[0] |= FATTR4_WORD0_FILEID;
4735
4736         nfs_fattr_init(&fs_locations->fattr);
4737         fs_locations->server = server;
4738         fs_locations->nlocations = 0;
4739         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4740         dprintk("%s: returned status = %d\n", __func__, status);
4741         return status;
4742 }
4743
4744 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4745 {
4746         int status;
4747         struct nfs4_secinfo_arg args = {
4748                 .dir_fh = NFS_FH(dir),
4749                 .name   = name,
4750         };
4751         struct nfs4_secinfo_res res = {
4752                 .flavors     = flavors,
4753         };
4754         struct rpc_message msg = {
4755                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4756                 .rpc_argp = &args,
4757                 .rpc_resp = &res,
4758         };
4759
4760         dprintk("NFS call  secinfo %s\n", name->name);
4761         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4762         dprintk("NFS reply  secinfo: %d\n", status);
4763         return status;
4764 }
4765
4766 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4767 {
4768         struct nfs4_exception exception = { };
4769         int err;
4770         do {
4771                 err = nfs4_handle_exception(NFS_SERVER(dir),
4772                                 _nfs4_proc_secinfo(dir, name, flavors),
4773                                 &exception);
4774         } while (exception.retry);
4775         return err;
4776 }
4777
4778 #ifdef CONFIG_NFS_V4_1
4779 /*
4780  * Check the exchange flags returned by the server for invalid flags, having
4781  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4782  * DS flags set.
4783  */
4784 static int nfs4_check_cl_exchange_flags(u32 flags)
4785 {
4786         if (flags & ~EXCHGID4_FLAG_MASK_R)
4787                 goto out_inval;
4788         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4789             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4790                 goto out_inval;
4791         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4792                 goto out_inval;
4793         return NFS_OK;
4794 out_inval:
4795         return -NFS4ERR_INVAL;
4796 }
4797
4798 /*
4799  * nfs4_proc_exchange_id()
4800  *
4801  * Since the clientid has expired, all compounds using sessions
4802  * associated with the stale clientid will be returning
4803  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4804  * be in some phase of session reset.
4805  */
4806 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4807 {
4808         nfs4_verifier verifier;
4809         struct nfs41_exchange_id_args args = {
4810                 .client = clp,
4811                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4812         };
4813         struct nfs41_exchange_id_res res = {
4814                 .client = clp,
4815         };
4816         int status;
4817         struct rpc_message msg = {
4818                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4819                 .rpc_argp = &args,
4820                 .rpc_resp = &res,
4821                 .rpc_cred = cred,
4822         };
4823         __be32 *p;
4824
4825         dprintk("--> %s\n", __func__);
4826         BUG_ON(clp == NULL);
4827
4828         p = (u32 *)verifier.data;
4829         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4830         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4831         args.verifier = &verifier;
4832
4833         args.id_len = scnprintf(args.id, sizeof(args.id),
4834                                 "%s/%s.%s/%u",
4835                                 clp->cl_ipaddr,
4836                                 init_utsname()->nodename,
4837                                 init_utsname()->domainname,
4838                                 clp->cl_rpcclient->cl_auth->au_flavor);
4839
4840         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4841         if (!status)
4842                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4843         dprintk("<-- %s status= %d\n", __func__, status);
4844         return status;
4845 }
4846
4847 struct nfs4_get_lease_time_data {
4848         struct nfs4_get_lease_time_args *args;
4849         struct nfs4_get_lease_time_res *res;
4850         struct nfs_client *clp;
4851 };
4852
4853 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4854                                         void *calldata)
4855 {
4856         int ret;
4857         struct nfs4_get_lease_time_data *data =
4858                         (struct nfs4_get_lease_time_data *)calldata;
4859
4860         dprintk("--> %s\n", __func__);
4861         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4862         /* just setup sequence, do not trigger session recovery
4863            since we're invoked within one */
4864         ret = nfs41_setup_sequence(data->clp->cl_session,
4865                                    &data->args->la_seq_args,
4866                                    &data->res->lr_seq_res, 0, task);
4867
4868         BUG_ON(ret == -EAGAIN);
4869         rpc_call_start(task);
4870         dprintk("<-- %s\n", __func__);
4871 }
4872
4873 /*
4874  * Called from nfs4_state_manager thread for session setup, so don't recover
4875  * from sequence operation or clientid errors.
4876  */
4877 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4878 {
4879         struct nfs4_get_lease_time_data *data =
4880                         (struct nfs4_get_lease_time_data *)calldata;
4881
4882         dprintk("--> %s\n", __func__);
4883         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4884                 return;
4885         switch (task->tk_status) {
4886         case -NFS4ERR_DELAY:
4887         case -NFS4ERR_GRACE:
4888                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4889                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4890                 task->tk_status = 0;
4891                 /* fall through */
4892         case -NFS4ERR_RETRY_UNCACHED_REP:
4893                 nfs_restart_rpc(task, data->clp);
4894                 return;
4895         }
4896         dprintk("<-- %s\n", __func__);
4897 }
4898
4899 struct rpc_call_ops nfs4_get_lease_time_ops = {
4900         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4901         .rpc_call_done = nfs4_get_lease_time_done,
4902 };
4903
4904 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4905 {
4906         struct rpc_task *task;
4907         struct nfs4_get_lease_time_args args;
4908         struct nfs4_get_lease_time_res res = {
4909                 .lr_fsinfo = fsinfo,
4910         };
4911         struct nfs4_get_lease_time_data data = {
4912                 .args = &args,
4913                 .res = &res,
4914                 .clp = clp,
4915         };
4916         struct rpc_message msg = {
4917                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4918                 .rpc_argp = &args,
4919                 .rpc_resp = &res,
4920         };
4921         struct rpc_task_setup task_setup = {
4922                 .rpc_client = clp->cl_rpcclient,
4923                 .rpc_message = &msg,
4924                 .callback_ops = &nfs4_get_lease_time_ops,
4925                 .callback_data = &data,
4926                 .flags = RPC_TASK_TIMEOUT,
4927         };
4928         int status;
4929
4930         dprintk("--> %s\n", __func__);
4931         task = rpc_run_task(&task_setup);
4932
4933         if (IS_ERR(task))
4934                 status = PTR_ERR(task);
4935         else {
4936                 status = task->tk_status;
4937                 rpc_put_task(task);
4938         }
4939         dprintk("<-- %s return %d\n", __func__, status);
4940
4941         return status;
4942 }
4943
4944 /*
4945  * Reset a slot table
4946  */
4947 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4948                                  int ivalue)
4949 {
4950         struct nfs4_slot *new = NULL;
4951         int i;
4952         int ret = 0;
4953
4954         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4955                 max_reqs, tbl->max_slots);
4956
4957         /* Does the newly negotiated max_reqs match the existing slot table? */
4958         if (max_reqs != tbl->max_slots) {
4959                 ret = -ENOMEM;
4960                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4961                               GFP_NOFS);
4962                 if (!new)
4963                         goto out;
4964                 ret = 0;
4965                 kfree(tbl->slots);
4966         }
4967         spin_lock(&tbl->slot_tbl_lock);
4968         if (new) {
4969                 tbl->slots = new;
4970                 tbl->max_slots = max_reqs;
4971         }
4972         for (i = 0; i < tbl->max_slots; ++i)
4973                 tbl->slots[i].seq_nr = ivalue;
4974         spin_unlock(&tbl->slot_tbl_lock);
4975         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4976                 tbl, tbl->slots, tbl->max_slots);
4977 out:
4978         dprintk("<-- %s: return %d\n", __func__, ret);
4979         return ret;
4980 }
4981
4982 /*
4983  * Reset the forechannel and backchannel slot tables
4984  */
4985 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4986 {
4987         int status;
4988
4989         status = nfs4_reset_slot_table(&session->fc_slot_table,
4990                         session->fc_attrs.max_reqs, 1);
4991         if (status)
4992                 return status;
4993
4994         status = nfs4_reset_slot_table(&session->bc_slot_table,
4995                         session->bc_attrs.max_reqs, 0);
4996         return status;
4997 }
4998
4999 /* Destroy the slot table */
5000 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5001 {
5002         if (session->fc_slot_table.slots != NULL) {
5003                 kfree(session->fc_slot_table.slots);
5004                 session->fc_slot_table.slots = NULL;
5005         }
5006         if (session->bc_slot_table.slots != NULL) {
5007                 kfree(session->bc_slot_table.slots);
5008                 session->bc_slot_table.slots = NULL;
5009         }
5010         return;
5011 }
5012
5013 /*
5014  * Initialize slot table
5015  */
5016 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5017                 int max_slots, int ivalue)
5018 {
5019         struct nfs4_slot *slot;
5020         int ret = -ENOMEM;
5021
5022         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5023
5024         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5025
5026         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5027         if (!slot)
5028                 goto out;
5029         ret = 0;
5030
5031         spin_lock(&tbl->slot_tbl_lock);
5032         tbl->max_slots = max_slots;
5033         tbl->slots = slot;
5034         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5035         spin_unlock(&tbl->slot_tbl_lock);
5036         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5037                 tbl, tbl->slots, tbl->max_slots);
5038 out:
5039         dprintk("<-- %s: return %d\n", __func__, ret);
5040         return ret;
5041 }
5042
5043 /*
5044  * Initialize the forechannel and backchannel tables
5045  */
5046 static int nfs4_init_slot_tables(struct nfs4_session *session)
5047 {
5048         struct nfs4_slot_table *tbl;
5049         int status = 0;
5050
5051         tbl = &session->fc_slot_table;
5052         if (tbl->slots == NULL) {
5053                 status = nfs4_init_slot_table(tbl,
5054                                 session->fc_attrs.max_reqs, 1);
5055                 if (status)
5056                         return status;
5057         }
5058
5059         tbl = &session->bc_slot_table;
5060         if (tbl->slots == NULL) {
5061                 status = nfs4_init_slot_table(tbl,
5062                                 session->bc_attrs.max_reqs, 0);
5063                 if (status)
5064                         nfs4_destroy_slot_tables(session);
5065         }
5066
5067         return status;
5068 }
5069
5070 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5071 {
5072         struct nfs4_session *session;
5073         struct nfs4_slot_table *tbl;
5074
5075         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5076         if (!session)
5077                 return NULL;
5078
5079         tbl = &session->fc_slot_table;
5080         tbl->highest_used_slotid = -1;
5081         spin_lock_init(&tbl->slot_tbl_lock);
5082         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5083         init_completion(&tbl->complete);
5084
5085         tbl = &session->bc_slot_table;
5086         tbl->highest_used_slotid = -1;
5087         spin_lock_init(&tbl->slot_tbl_lock);
5088         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5089         init_completion(&tbl->complete);
5090
5091         session->session_state = 1<<NFS4_SESSION_INITING;
5092
5093         session->clp = clp;
5094         return session;
5095 }
5096
5097 void nfs4_destroy_session(struct nfs4_session *session)
5098 {
5099         nfs4_proc_destroy_session(session);
5100         dprintk("%s Destroy backchannel for xprt %p\n",
5101                 __func__, session->clp->cl_rpcclient->cl_xprt);
5102         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5103                                 NFS41_BC_MIN_CALLBACKS);
5104         nfs4_destroy_slot_tables(session);
5105         kfree(session);
5106 }
5107
5108 /*
5109  * Initialize the values to be used by the client in CREATE_SESSION
5110  * If nfs4_init_session set the fore channel request and response sizes,
5111  * use them.
5112  *
5113  * Set the back channel max_resp_sz_cached to zero to force the client to
5114  * always set csa_cachethis to FALSE because the current implementation
5115  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5116  */
5117 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5118 {
5119         struct nfs4_session *session = args->client->cl_session;
5120         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5121                      mxresp_sz = session->fc_attrs.max_resp_sz;
5122
5123         if (mxrqst_sz == 0)
5124                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5125         if (mxresp_sz == 0)
5126                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5127         /* Fore channel attributes */
5128         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5129         args->fc_attrs.max_resp_sz = mxresp_sz;
5130         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5131         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5132
5133         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5134                 "max_ops=%u max_reqs=%u\n",
5135                 __func__,
5136                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5137                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5138
5139         /* Back channel attributes */
5140         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5141         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5142         args->bc_attrs.max_resp_sz_cached = 0;
5143         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5144         args->bc_attrs.max_reqs = 1;
5145
5146         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5147                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5148                 __func__,
5149                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5150                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5151                 args->bc_attrs.max_reqs);
5152 }
5153
5154 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5155 {
5156         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5157         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5158
5159         if (rcvd->max_resp_sz > sent->max_resp_sz)
5160                 return -EINVAL;
5161         /*
5162          * Our requested max_ops is the minimum we need; we're not
5163          * prepared to break up compounds into smaller pieces than that.
5164          * So, no point even trying to continue if the server won't
5165          * cooperate:
5166          */
5167         if (rcvd->max_ops < sent->max_ops)
5168                 return -EINVAL;
5169         if (rcvd->max_reqs == 0)
5170                 return -EINVAL;
5171         return 0;
5172 }
5173
5174 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5175 {
5176         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5177         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5178
5179         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5180                 return -EINVAL;
5181         if (rcvd->max_resp_sz < sent->max_resp_sz)
5182                 return -EINVAL;
5183         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5184                 return -EINVAL;
5185         /* These would render the backchannel useless: */
5186         if (rcvd->max_ops  == 0)
5187                 return -EINVAL;
5188         if (rcvd->max_reqs == 0)
5189                 return -EINVAL;
5190         return 0;
5191 }
5192
5193 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5194                                      struct nfs4_session *session)
5195 {
5196         int ret;
5197
5198         ret = nfs4_verify_fore_channel_attrs(args, session);
5199         if (ret)
5200                 return ret;
5201         return nfs4_verify_back_channel_attrs(args, session);
5202 }
5203
5204 static int _nfs4_proc_create_session(struct nfs_client *clp)
5205 {
5206         struct nfs4_session *session = clp->cl_session;
5207         struct nfs41_create_session_args args = {
5208                 .client = clp,
5209                 .cb_program = NFS4_CALLBACK,
5210         };
5211         struct nfs41_create_session_res res = {
5212                 .client = clp,
5213         };
5214         struct rpc_message msg = {
5215                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5216                 .rpc_argp = &args,
5217                 .rpc_resp = &res,
5218         };
5219         int status;
5220
5221         nfs4_init_channel_attrs(&args);
5222         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5223
5224         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5225
5226         if (!status)
5227                 /* Verify the session's negotiated channel_attrs values */
5228                 status = nfs4_verify_channel_attrs(&args, session);
5229         if (!status) {
5230                 /* Increment the clientid slot sequence id */
5231                 clp->cl_seqid++;
5232         }
5233
5234         return status;
5235 }
5236
5237 /*
5238  * Issues a CREATE_SESSION operation to the server.
5239  * It is the responsibility of the caller to verify the session is
5240  * expired before calling this routine.
5241  */
5242 int nfs4_proc_create_session(struct nfs_client *clp)
5243 {
5244         int status;
5245         unsigned *ptr;
5246         struct nfs4_session *session = clp->cl_session;
5247
5248         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5249
5250         status = _nfs4_proc_create_session(clp);
5251         if (status)
5252                 goto out;
5253
5254         /* Init and reset the fore channel */
5255         status = nfs4_init_slot_tables(session);
5256         dprintk("slot table initialization returned %d\n", status);
5257         if (status)
5258                 goto out;
5259         status = nfs4_reset_slot_tables(session);
5260         dprintk("slot table reset returned %d\n", status);
5261         if (status)
5262                 goto out;
5263
5264         ptr = (unsigned *)&session->sess_id.data[0];
5265         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5266                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5267 out:
5268         dprintk("<-- %s\n", __func__);
5269         return status;
5270 }
5271
5272 /*
5273  * Issue the over-the-wire RPC DESTROY_SESSION.
5274  * The caller must serialize access to this routine.
5275  */
5276 int nfs4_proc_destroy_session(struct nfs4_session *session)
5277 {
5278         int status = 0;
5279         struct rpc_message msg;
5280
5281         dprintk("--> nfs4_proc_destroy_session\n");
5282
5283         /* session is still being setup */
5284         if (session->clp->cl_cons_state != NFS_CS_READY)
5285                 return status;
5286
5287         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5288         msg.rpc_argp = session;
5289         msg.rpc_resp = NULL;
5290         msg.rpc_cred = NULL;
5291         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5292
5293         if (status)
5294                 printk(KERN_WARNING
5295                         "Got error %d from the server on DESTROY_SESSION. "
5296                         "Session has been destroyed regardless...\n", status);
5297
5298         dprintk("<-- nfs4_proc_destroy_session\n");
5299         return status;
5300 }
5301
5302 int nfs4_init_session(struct nfs_server *server)
5303 {
5304         struct nfs_client *clp = server->nfs_client;
5305         struct nfs4_session *session;
5306         unsigned int rsize, wsize;
5307         int ret;
5308
5309         if (!nfs4_has_session(clp))
5310                 return 0;
5311
5312         session = clp->cl_session;
5313         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5314                 return 0;
5315
5316         rsize = server->rsize;
5317         if (rsize == 0)
5318                 rsize = NFS_MAX_FILE_IO_SIZE;
5319         wsize = server->wsize;
5320         if (wsize == 0)
5321                 wsize = NFS_MAX_FILE_IO_SIZE;
5322
5323         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5324         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5325
5326         ret = nfs4_recover_expired_lease(server);
5327         if (!ret)
5328                 ret = nfs4_check_client_ready(clp);
5329         return ret;
5330 }
5331
5332 int nfs4_init_ds_session(struct nfs_client *clp)
5333 {
5334         struct nfs4_session *session = clp->cl_session;
5335         int ret;
5336
5337         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5338                 return 0;
5339
5340         ret = nfs4_client_recover_expired_lease(clp);
5341         if (!ret)
5342                 /* Test for the DS role */
5343                 if (!is_ds_client(clp))
5344                         ret = -ENODEV;
5345         if (!ret)
5346                 ret = nfs4_check_client_ready(clp);
5347         return ret;
5348
5349 }
5350 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5351
5352
5353 /*
5354  * Renew the cl_session lease.
5355  */
5356 struct nfs4_sequence_data {
5357         struct nfs_client *clp;
5358         struct nfs4_sequence_args args;
5359         struct nfs4_sequence_res res;
5360 };
5361
5362 static void nfs41_sequence_release(void *data)
5363 {
5364         struct nfs4_sequence_data *calldata = data;
5365         struct nfs_client *clp = calldata->clp;
5366
5367         if (atomic_read(&clp->cl_count) > 1)
5368                 nfs4_schedule_state_renewal(clp);
5369         nfs_put_client(clp);
5370         kfree(calldata);
5371 }
5372
5373 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5374 {
5375         switch(task->tk_status) {
5376         case -NFS4ERR_DELAY:
5377                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5378                 return -EAGAIN;
5379         default:
5380                 nfs4_schedule_lease_recovery(clp);
5381         }
5382         return 0;
5383 }
5384
5385 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5386 {
5387         struct nfs4_sequence_data *calldata = data;
5388         struct nfs_client *clp = calldata->clp;
5389
5390         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5391                 return;
5392
5393         if (task->tk_status < 0) {
5394                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5395                 if (atomic_read(&clp->cl_count) == 1)
5396                         goto out;
5397
5398                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5399                         rpc_restart_call_prepare(task);
5400                         return;
5401                 }
5402         }
5403         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5404 out:
5405         dprintk("<-- %s\n", __func__);
5406 }
5407
5408 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5409 {
5410         struct nfs4_sequence_data *calldata = data;
5411         struct nfs_client *clp = calldata->clp;
5412         struct nfs4_sequence_args *args;
5413         struct nfs4_sequence_res *res;
5414
5415         args = task->tk_msg.rpc_argp;
5416         res = task->tk_msg.rpc_resp;
5417
5418         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5419                 return;
5420         rpc_call_start(task);
5421 }
5422
5423 static const struct rpc_call_ops nfs41_sequence_ops = {
5424         .rpc_call_done = nfs41_sequence_call_done,
5425         .rpc_call_prepare = nfs41_sequence_prepare,
5426         .rpc_release = nfs41_sequence_release,
5427 };
5428
5429 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5430 {
5431         struct nfs4_sequence_data *calldata;
5432         struct rpc_message msg = {
5433                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5434                 .rpc_cred = cred,
5435         };
5436         struct rpc_task_setup task_setup_data = {
5437                 .rpc_client = clp->cl_rpcclient,
5438                 .rpc_message = &msg,
5439                 .callback_ops = &nfs41_sequence_ops,
5440                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5441         };
5442
5443         if (!atomic_inc_not_zero(&clp->cl_count))
5444                 return ERR_PTR(-EIO);
5445         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5446         if (calldata == NULL) {
5447                 nfs_put_client(clp);
5448                 return ERR_PTR(-ENOMEM);
5449         }
5450         msg.rpc_argp = &calldata->args;
5451         msg.rpc_resp = &calldata->res;
5452         calldata->clp = clp;
5453         task_setup_data.callback_data = calldata;
5454
5455         return rpc_run_task(&task_setup_data);
5456 }
5457
5458 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5459 {
5460         struct rpc_task *task;
5461         int ret = 0;
5462
5463         task = _nfs41_proc_sequence(clp, cred);
5464         if (IS_ERR(task))
5465                 ret = PTR_ERR(task);
5466         else
5467                 rpc_put_task_async(task);
5468         dprintk("<-- %s status=%d\n", __func__, ret);
5469         return ret;
5470 }
5471
5472 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5473 {
5474         struct rpc_task *task;
5475         int ret;
5476
5477         task = _nfs41_proc_sequence(clp, cred);
5478         if (IS_ERR(task)) {
5479                 ret = PTR_ERR(task);
5480                 goto out;
5481         }
5482         ret = rpc_wait_for_completion_task(task);
5483         if (!ret) {
5484                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5485
5486                 if (task->tk_status == 0)
5487                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5488                 ret = task->tk_status;
5489         }
5490         rpc_put_task(task);
5491 out:
5492         dprintk("<-- %s status=%d\n", __func__, ret);
5493         return ret;
5494 }
5495
5496 struct nfs4_reclaim_complete_data {
5497         struct nfs_client *clp;
5498         struct nfs41_reclaim_complete_args arg;
5499         struct nfs41_reclaim_complete_res res;
5500 };
5501
5502 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5503 {
5504         struct nfs4_reclaim_complete_data *calldata = data;
5505
5506         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5507         if (nfs41_setup_sequence(calldata->clp->cl_session,
5508                                 &calldata->arg.seq_args,
5509                                 &calldata->res.seq_res, 0, task))
5510                 return;
5511
5512         rpc_call_start(task);
5513 }
5514
5515 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5516 {
5517         switch(task->tk_status) {
5518         case 0:
5519         case -NFS4ERR_COMPLETE_ALREADY:
5520         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5521                 break;
5522         case -NFS4ERR_DELAY:
5523                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5524                 /* fall through */
5525         case -NFS4ERR_RETRY_UNCACHED_REP:
5526                 return -EAGAIN;
5527         default:
5528                 nfs4_schedule_lease_recovery(clp);
5529         }
5530         return 0;
5531 }
5532
5533 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5534 {
5535         struct nfs4_reclaim_complete_data *calldata = data;
5536         struct nfs_client *clp = calldata->clp;
5537         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5538
5539         dprintk("--> %s\n", __func__);
5540         if (!nfs41_sequence_done(task, res))
5541                 return;
5542
5543         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5544                 rpc_restart_call_prepare(task);
5545                 return;
5546         }
5547         dprintk("<-- %s\n", __func__);
5548 }
5549
5550 static void nfs4_free_reclaim_complete_data(void *data)
5551 {
5552         struct nfs4_reclaim_complete_data *calldata = data;
5553
5554         kfree(calldata);
5555 }
5556
5557 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5558         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5559         .rpc_call_done = nfs4_reclaim_complete_done,
5560         .rpc_release = nfs4_free_reclaim_complete_data,
5561 };
5562
5563 /*
5564  * Issue a global reclaim complete.
5565  */
5566 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5567 {
5568         struct nfs4_reclaim_complete_data *calldata;
5569         struct rpc_task *task;
5570         struct rpc_message msg = {
5571                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5572         };
5573         struct rpc_task_setup task_setup_data = {
5574                 .rpc_client = clp->cl_rpcclient,
5575                 .rpc_message = &msg,
5576                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5577                 .flags = RPC_TASK_ASYNC,
5578         };
5579         int status = -ENOMEM;
5580
5581         dprintk("--> %s\n", __func__);
5582         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5583         if (calldata == NULL)
5584                 goto out;
5585         calldata->clp = clp;
5586         calldata->arg.one_fs = 0;
5587
5588         msg.rpc_argp = &calldata->arg;
5589         msg.rpc_resp = &calldata->res;
5590         task_setup_data.callback_data = calldata;
5591         task = rpc_run_task(&task_setup_data);
5592         if (IS_ERR(task)) {
5593                 status = PTR_ERR(task);
5594                 goto out;
5595         }
5596         status = nfs4_wait_for_completion_rpc_task(task);
5597         if (status == 0)
5598                 status = task->tk_status;
5599         rpc_put_task(task);
5600         return 0;
5601 out:
5602         dprintk("<-- %s status=%d\n", __func__, status);
5603         return status;
5604 }
5605
5606 static void
5607 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5608 {
5609         struct nfs4_layoutget *lgp = calldata;
5610         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5611
5612         dprintk("--> %s\n", __func__);
5613         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5614          * right now covering the LAYOUTGET we are about to send.
5615          * However, that is not so catastrophic, and there seems
5616          * to be no way to prevent it completely.
5617          */
5618         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5619                                 &lgp->res.seq_res, 0, task))
5620                 return;
5621         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5622                                           NFS_I(lgp->args.inode)->layout,
5623                                           lgp->args.ctx->state)) {
5624                 rpc_exit(task, NFS4_OK);
5625                 return;
5626         }
5627         rpc_call_start(task);
5628 }
5629
5630 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5631 {
5632         struct nfs4_layoutget *lgp = calldata;
5633         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5634
5635         dprintk("--> %s\n", __func__);
5636
5637         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5638                 return;
5639
5640         switch (task->tk_status) {
5641         case 0:
5642                 break;
5643         case -NFS4ERR_LAYOUTTRYLATER:
5644         case -NFS4ERR_RECALLCONFLICT:
5645                 task->tk_status = -NFS4ERR_DELAY;
5646                 /* Fall through */
5647         default:
5648                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5649                         rpc_restart_call_prepare(task);
5650                         return;
5651                 }
5652         }
5653         dprintk("<-- %s\n", __func__);
5654 }
5655
5656 static void nfs4_layoutget_release(void *calldata)
5657 {
5658         struct nfs4_layoutget *lgp = calldata;
5659
5660         dprintk("--> %s\n", __func__);
5661         put_nfs_open_context(lgp->args.ctx);
5662         kfree(calldata);
5663         dprintk("<-- %s\n", __func__);
5664 }
5665
5666 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5667         .rpc_call_prepare = nfs4_layoutget_prepare,
5668         .rpc_call_done = nfs4_layoutget_done,
5669         .rpc_release = nfs4_layoutget_release,
5670 };
5671
5672 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5673 {
5674         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5675         struct rpc_task *task;
5676         struct rpc_message msg = {
5677                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5678                 .rpc_argp = &lgp->args,
5679                 .rpc_resp = &lgp->res,
5680         };
5681         struct rpc_task_setup task_setup_data = {
5682                 .rpc_client = server->client,
5683                 .rpc_message = &msg,
5684                 .callback_ops = &nfs4_layoutget_call_ops,
5685                 .callback_data = lgp,
5686                 .flags = RPC_TASK_ASYNC,
5687         };
5688         int status = 0;
5689
5690         dprintk("--> %s\n", __func__);
5691
5692         lgp->res.layoutp = &lgp->args.layout;
5693         lgp->res.seq_res.sr_slot = NULL;
5694         task = rpc_run_task(&task_setup_data);
5695         if (IS_ERR(task))
5696                 return PTR_ERR(task);
5697         status = nfs4_wait_for_completion_rpc_task(task);
5698         if (status == 0)
5699                 status = task->tk_status;
5700         if (status == 0)
5701                 status = pnfs_layout_process(lgp);
5702         rpc_put_task(task);
5703         dprintk("<-- %s status=%d\n", __func__, status);
5704         return status;
5705 }
5706
5707 static void
5708 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5709 {
5710         struct nfs4_layoutreturn *lrp = calldata;
5711
5712         dprintk("--> %s\n", __func__);
5713         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5714                                 &lrp->res.seq_res, 0, task))
5715                 return;
5716         rpc_call_start(task);
5717 }
5718
5719 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5720 {
5721         struct nfs4_layoutreturn *lrp = calldata;
5722         struct nfs_server *server;
5723         struct pnfs_layout_hdr *lo = NFS_I(lrp->args.inode)->layout;
5724
5725         dprintk("--> %s\n", __func__);
5726
5727         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5728                 return;
5729
5730         server = NFS_SERVER(lrp->args.inode);
5731         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5732                 nfs_restart_rpc(task, lrp->clp);
5733                 return;
5734         }
5735         spin_lock(&lo->plh_inode->i_lock);
5736         if (task->tk_status == 0) {
5737                 if (lrp->res.lrs_present) {
5738                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5739                 } else
5740                         BUG_ON(!list_empty(&lo->plh_segs));
5741         }
5742         lo->plh_block_lgets--;
5743         spin_unlock(&lo->plh_inode->i_lock);
5744         dprintk("<-- %s\n", __func__);
5745 }
5746
5747 static void nfs4_layoutreturn_release(void *calldata)
5748 {
5749         struct nfs4_layoutreturn *lrp = calldata;
5750
5751         dprintk("--> %s\n", __func__);
5752         put_layout_hdr(NFS_I(lrp->args.inode)->layout);
5753         kfree(calldata);
5754         dprintk("<-- %s\n", __func__);
5755 }
5756
5757 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5758         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5759         .rpc_call_done = nfs4_layoutreturn_done,
5760         .rpc_release = nfs4_layoutreturn_release,
5761 };
5762
5763 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5764 {
5765         struct rpc_task *task;
5766         struct rpc_message msg = {
5767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5768                 .rpc_argp = &lrp->args,
5769                 .rpc_resp = &lrp->res,
5770         };
5771         struct rpc_task_setup task_setup_data = {
5772                 .rpc_client = lrp->clp->cl_rpcclient,
5773                 .rpc_message = &msg,
5774                 .callback_ops = &nfs4_layoutreturn_call_ops,
5775                 .callback_data = lrp,
5776         };
5777         int status;
5778
5779         dprintk("--> %s\n", __func__);
5780         task = rpc_run_task(&task_setup_data);
5781         if (IS_ERR(task))
5782                 return PTR_ERR(task);
5783         status = task->tk_status;
5784         dprintk("<-- %s status=%d\n", __func__, status);
5785         rpc_put_task(task);
5786         return status;
5787 }
5788
5789 static int
5790 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5791 {
5792         struct nfs4_getdeviceinfo_args args = {
5793                 .pdev = pdev,
5794         };
5795         struct nfs4_getdeviceinfo_res res = {
5796                 .pdev = pdev,
5797         };
5798         struct rpc_message msg = {
5799                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5800                 .rpc_argp = &args,
5801                 .rpc_resp = &res,
5802         };
5803         int status;
5804
5805         dprintk("--> %s\n", __func__);
5806         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5807         dprintk("<-- %s status=%d\n", __func__, status);
5808
5809         return status;
5810 }
5811
5812 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5813 {
5814         struct nfs4_exception exception = { };
5815         int err;
5816
5817         do {
5818                 err = nfs4_handle_exception(server,
5819                                         _nfs4_proc_getdeviceinfo(server, pdev),
5820                                         &exception);
5821         } while (exception.retry);
5822         return err;
5823 }
5824 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5825
5826 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5827 {
5828         struct nfs4_layoutcommit_data *data = calldata;
5829         struct nfs_server *server = NFS_SERVER(data->args.inode);
5830
5831         if (nfs4_setup_sequence(server, &data->args.seq_args,
5832                                 &data->res.seq_res, 1, task))
5833                 return;
5834         rpc_call_start(task);
5835 }
5836
5837 static void
5838 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5839 {
5840         struct nfs4_layoutcommit_data *data = calldata;
5841         struct nfs_server *server = NFS_SERVER(data->args.inode);
5842
5843         if (!nfs4_sequence_done(task, &data->res.seq_res))
5844                 return;
5845
5846         switch (task->tk_status) { /* Just ignore these failures */
5847         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5848         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5849         case NFS4ERR_BADLAYOUT:     /* no layout */
5850         case NFS4ERR_GRACE:         /* loca_recalim always false */
5851                 task->tk_status = 0;
5852         }
5853
5854         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5855                 nfs_restart_rpc(task, server->nfs_client);
5856                 return;
5857         }
5858
5859         if (task->tk_status == 0)
5860                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5861                                                    data->res.fattr);
5862 }
5863
5864 static void nfs4_layoutcommit_release(void *calldata)
5865 {
5866         struct nfs4_layoutcommit_data *data = calldata;
5867         struct pnfs_layout_segment *lseg, *tmp;
5868
5869         /* Matched by references in pnfs_set_layoutcommit */
5870         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5871                 list_del_init(&lseg->pls_lc_list);
5872                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
5873                                        &lseg->pls_flags))
5874                         put_lseg(lseg);
5875         }
5876         put_rpccred(data->cred);
5877         kfree(data);
5878 }
5879
5880 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5881         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5882         .rpc_call_done = nfs4_layoutcommit_done,
5883         .rpc_release = nfs4_layoutcommit_release,
5884 };
5885
5886 int
5887 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5888 {
5889         struct rpc_message msg = {
5890                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5891                 .rpc_argp = &data->args,
5892                 .rpc_resp = &data->res,
5893                 .rpc_cred = data->cred,
5894         };
5895         struct rpc_task_setup task_setup_data = {
5896                 .task = &data->task,
5897                 .rpc_client = NFS_CLIENT(data->args.inode),
5898                 .rpc_message = &msg,
5899                 .callback_ops = &nfs4_layoutcommit_ops,
5900                 .callback_data = data,
5901                 .flags = RPC_TASK_ASYNC,
5902         };
5903         struct rpc_task *task;
5904         int status = 0;
5905
5906         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5907                 "lbw: %llu inode %lu\n",
5908                 data->task.tk_pid, sync,
5909                 data->args.lastbytewritten,
5910                 data->args.inode->i_ino);
5911
5912         task = rpc_run_task(&task_setup_data);
5913         if (IS_ERR(task))
5914                 return PTR_ERR(task);
5915         if (sync == false)
5916                 goto out;
5917         status = nfs4_wait_for_completion_rpc_task(task);
5918         if (status != 0)
5919                 goto out;
5920         status = task->tk_status;
5921 out:
5922         dprintk("%s: status %d\n", __func__, status);
5923         rpc_put_task(task);
5924         return status;
5925 }
5926 #endif /* CONFIG_NFS_V4_1 */
5927
5928 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5929         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5930         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5931         .recover_open   = nfs4_open_reclaim,
5932         .recover_lock   = nfs4_lock_reclaim,
5933         .establish_clid = nfs4_init_clientid,
5934         .get_clid_cred  = nfs4_get_setclientid_cred,
5935 };
5936
5937 #if defined(CONFIG_NFS_V4_1)
5938 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5939         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5940         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5941         .recover_open   = nfs4_open_reclaim,
5942         .recover_lock   = nfs4_lock_reclaim,
5943         .establish_clid = nfs41_init_clientid,
5944         .get_clid_cred  = nfs4_get_exchange_id_cred,
5945         .reclaim_complete = nfs41_proc_reclaim_complete,
5946 };
5947 #endif /* CONFIG_NFS_V4_1 */
5948
5949 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5950         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5951         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5952         .recover_open   = nfs4_open_expired,
5953         .recover_lock   = nfs4_lock_expired,
5954         .establish_clid = nfs4_init_clientid,
5955         .get_clid_cred  = nfs4_get_setclientid_cred,
5956 };
5957
5958 #if defined(CONFIG_NFS_V4_1)
5959 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5960         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5961         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5962         .recover_open   = nfs4_open_expired,
5963         .recover_lock   = nfs4_lock_expired,
5964         .establish_clid = nfs41_init_clientid,
5965         .get_clid_cred  = nfs4_get_exchange_id_cred,
5966 };
5967 #endif /* CONFIG_NFS_V4_1 */
5968
5969 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5970         .sched_state_renewal = nfs4_proc_async_renew,
5971         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5972         .renew_lease = nfs4_proc_renew,
5973 };
5974
5975 #if defined(CONFIG_NFS_V4_1)
5976 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5977         .sched_state_renewal = nfs41_proc_async_sequence,
5978         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5979         .renew_lease = nfs4_proc_sequence,
5980 };
5981 #endif
5982
5983 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5984         .minor_version = 0,
5985         .call_sync = _nfs4_call_sync,
5986         .validate_stateid = nfs4_validate_delegation_stateid,
5987         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5988         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5989         .state_renewal_ops = &nfs40_state_renewal_ops,
5990 };
5991
5992 #if defined(CONFIG_NFS_V4_1)
5993 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5994         .minor_version = 1,
5995         .call_sync = _nfs4_call_sync_session,
5996         .validate_stateid = nfs41_validate_delegation_stateid,
5997         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5998         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5999         .state_renewal_ops = &nfs41_state_renewal_ops,
6000 };
6001 #endif
6002
6003 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6004         [0] = &nfs_v4_0_minor_ops,
6005 #if defined(CONFIG_NFS_V4_1)
6006         [1] = &nfs_v4_1_minor_ops,
6007 #endif
6008 };
6009
6010 static const struct inode_operations nfs4_file_inode_operations = {
6011         .permission     = nfs_permission,
6012         .getattr        = nfs_getattr,
6013         .setattr        = nfs_setattr,
6014         .getxattr       = generic_getxattr,
6015         .setxattr       = generic_setxattr,
6016         .listxattr      = generic_listxattr,
6017         .removexattr    = generic_removexattr,
6018 };
6019
6020 const struct nfs_rpc_ops nfs_v4_clientops = {
6021         .version        = 4,                    /* protocol version */
6022         .dentry_ops     = &nfs4_dentry_operations,
6023         .dir_inode_ops  = &nfs4_dir_inode_operations,
6024         .file_inode_ops = &nfs4_file_inode_operations,
6025         .file_ops       = &nfs4_file_operations,
6026         .getroot        = nfs4_proc_get_root,
6027         .getattr        = nfs4_proc_getattr,
6028         .setattr        = nfs4_proc_setattr,
6029         .lookupfh       = nfs4_proc_lookupfh,
6030         .lookup         = nfs4_proc_lookup,
6031         .access         = nfs4_proc_access,
6032         .readlink       = nfs4_proc_readlink,
6033         .create         = nfs4_proc_create,
6034         .remove         = nfs4_proc_remove,
6035         .unlink_setup   = nfs4_proc_unlink_setup,
6036         .unlink_done    = nfs4_proc_unlink_done,
6037         .rename         = nfs4_proc_rename,
6038         .rename_setup   = nfs4_proc_rename_setup,
6039         .rename_done    = nfs4_proc_rename_done,
6040         .link           = nfs4_proc_link,
6041         .symlink        = nfs4_proc_symlink,
6042         .mkdir          = nfs4_proc_mkdir,
6043         .rmdir          = nfs4_proc_remove,
6044         .readdir        = nfs4_proc_readdir,
6045         .mknod          = nfs4_proc_mknod,
6046         .statfs         = nfs4_proc_statfs,
6047         .fsinfo         = nfs4_proc_fsinfo,
6048         .pathconf       = nfs4_proc_pathconf,
6049         .set_capabilities = nfs4_server_capabilities,
6050         .decode_dirent  = nfs4_decode_dirent,
6051         .read_setup     = nfs4_proc_read_setup,
6052         .read_done      = nfs4_read_done,
6053         .write_setup    = nfs4_proc_write_setup,
6054         .write_done     = nfs4_write_done,
6055         .commit_setup   = nfs4_proc_commit_setup,
6056         .commit_done    = nfs4_commit_done,
6057         .lock           = nfs4_proc_lock,
6058         .clear_acl_cache = nfs4_zap_acl_attr,
6059         .close_context  = nfs4_close_context,
6060         .open_context   = nfs4_atomic_open,
6061         .init_client    = nfs4_init_client,
6062         .secinfo        = nfs4_proc_secinfo,
6063 };
6064
6065 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6066         .prefix = XATTR_NAME_NFSV4_ACL,
6067         .list   = nfs4_xattr_list_nfs4_acl,
6068         .get    = nfs4_xattr_get_nfs4_acl,
6069         .set    = nfs4_xattr_set_nfs4_acl,
6070 };
6071
6072 const struct xattr_handler *nfs4_xattr_handlers[] = {
6073         &nfs4_xattr_nfs4_acl_handler,
6074         NULL
6075 };
6076
6077 /*
6078  * Local variables:
6079  *  c-basic-offset: 8
6080  * End:
6081  */