fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         if (NFS_SERVER(dir)->nfs_client->cl_minorversion < 2)
 109                 return NULL;
 110
 111         err = security_dentry_init_security(dentry, sattr->ia_mode,
 112                                 &dentry->d_name, (void **)&label->label, &label->len);
 113         if (err == 0)
 114                 return label;
 115
 116         return NULL;
 117 }
 118 static inline void
 119 nfs4_label_release_security(struct nfs4_label *label)
 120 {
 121         if (label)
 122                 security_release_secctx(label->label, label->len);
 123 }
 124 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 125 {
 126         if (label)
 127                 return server->attr_bitmask;
 128
 129         return server->attr_bitmask_nl;
 130 }
 131 #else
 132 static inline struct nfs4_label *
 133 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 134         struct iattr *sattr, struct nfs4_label *l)
 135 { return NULL; }
 136 static inline void
 137 nfs4_label_release_security(struct nfs4_label *label)
 138 { return; }
 139 static inline u32 *
 140 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 141 { return server->attr_bitmask; }
 142 #endif
 143
 144 /* Prevent leaks of NFSv4 errors into userland */
 145 static int nfs4_map_errors(int err)
 146 {
 147         if (err >= -1000)
 148                 return err;
 149         switch (err) {
 150         case -NFS4ERR_RESOURCE:
 151         case -NFS4ERR_LAYOUTTRYLATER:
 152         case -NFS4ERR_RECALLCONFLICT:
 153                 return -EREMOTEIO;
 154         case -NFS4ERR_WRONGSEC:
 155                 return -EPERM;
 156         case -NFS4ERR_BADOWNER:
 157         case -NFS4ERR_BADNAME:
 158                 return -EINVAL;
 159         case -NFS4ERR_SHARE_DENIED:
 160                 return -EACCES;
 161         case -NFS4ERR_MINOR_VERS_MISMATCH:
 162                 return -EPROTONOSUPPORT;
 163         case -NFS4ERR_ACCESS:
 164                 return -EACCES;
 165         case -NFS4ERR_FILE_OPEN:
 166                 return -EBUSY;
 167         default:
 168                 dprintk("%s could not handle NFSv4 error %d\n",
 169                                 __func__, -err);
 170                 break;
 171         }
 172         return -EIO;
 173 }
 174
 175 /*
 176  * This is our standard bitmap for GETATTR requests.
 177  */
 178 const u32 nfs4_fattr_bitmap[3] = {
 179         FATTR4_WORD0_TYPE
 180         | FATTR4_WORD0_CHANGE
 181         | FATTR4_WORD0_SIZE
 182         | FATTR4_WORD0_FSID
 183         | FATTR4_WORD0_FILEID,
 184         FATTR4_WORD1_MODE
 185         | FATTR4_WORD1_NUMLINKS
 186         | FATTR4_WORD1_OWNER
 187         | FATTR4_WORD1_OWNER_GROUP
 188         | FATTR4_WORD1_RAWDEV
 189         | FATTR4_WORD1_SPACE_USED
 190         | FATTR4_WORD1_TIME_ACCESS
 191         | FATTR4_WORD1_TIME_METADATA
 192         | FATTR4_WORD1_TIME_MODIFY,
 193 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 194         FATTR4_WORD2_SECURITY_LABEL
 195 #endif
 196 };
 197
 198 static const u32 nfs4_pnfs_open_bitmap[3] = {
 199         FATTR4_WORD0_TYPE
 200         | FATTR4_WORD0_CHANGE
 201         | FATTR4_WORD0_SIZE
 202         | FATTR4_WORD0_FSID
 203         | FATTR4_WORD0_FILEID,
 204         FATTR4_WORD1_MODE
 205         | FATTR4_WORD1_NUMLINKS
 206         | FATTR4_WORD1_OWNER
 207         | FATTR4_WORD1_OWNER_GROUP
 208         | FATTR4_WORD1_RAWDEV
 209         | FATTR4_WORD1_SPACE_USED
 210         | FATTR4_WORD1_TIME_ACCESS
 211         | FATTR4_WORD1_TIME_METADATA
 212         | FATTR4_WORD1_TIME_MODIFY,
 213         FATTR4_WORD2_MDSTHRESHOLD
 214 };
 215
 216 static const u32 nfs4_open_noattr_bitmap[3] = {
 217         FATTR4_WORD0_TYPE
 218         | FATTR4_WORD0_CHANGE
 219         | FATTR4_WORD0_FILEID,
 220 };
 221
 222 const u32 nfs4_statfs_bitmap[3] = {
 223         FATTR4_WORD0_FILES_AVAIL
 224         | FATTR4_WORD0_FILES_FREE
 225         | FATTR4_WORD0_FILES_TOTAL,
 226         FATTR4_WORD1_SPACE_AVAIL
 227         | FATTR4_WORD1_SPACE_FREE
 228         | FATTR4_WORD1_SPACE_TOTAL
 229 };
 230
 231 const u32 nfs4_pathconf_bitmap[3] = {
 232         FATTR4_WORD0_MAXLINK
 233         | FATTR4_WORD0_MAXNAME,
 234         0
 235 };
 236
 237 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 238                         | FATTR4_WORD0_MAXREAD
 239                         | FATTR4_WORD0_MAXWRITE
 240                         | FATTR4_WORD0_LEASE_TIME,
 241                         FATTR4_WORD1_TIME_DELTA
 242                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 243                         FATTR4_WORD2_LAYOUT_BLKSIZE
 244 };
 245
 246 const u32 nfs4_fs_locations_bitmap[3] = {
 247         FATTR4_WORD0_TYPE
 248         | FATTR4_WORD0_CHANGE
 249         | FATTR4_WORD0_SIZE
 250         | FATTR4_WORD0_FSID
 251         | FATTR4_WORD0_FILEID
 252         | FATTR4_WORD0_FS_LOCATIONS,
 253         FATTR4_WORD1_MODE
 254         | FATTR4_WORD1_NUMLINKS
 255         | FATTR4_WORD1_OWNER
 256         | FATTR4_WORD1_OWNER_GROUP
 257         | FATTR4_WORD1_RAWDEV
 258         | FATTR4_WORD1_SPACE_USED
 259         | FATTR4_WORD1_TIME_ACCESS
 260         | FATTR4_WORD1_TIME_METADATA
 261         | FATTR4_WORD1_TIME_MODIFY
 262         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 263 };
 264
 265 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 266                 struct nfs4_readdir_arg *readdir)
 267 {
 268         __be32 *start, *p;
 269
 270         if (cookie > 2) {
 271                 readdir->cookie = cookie;
 272                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 273                 return;
 274         }
 275
 276         readdir->cookie = 0;
 277         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 278         if (cookie == 2)
 279                 return;
 280
 281         /*
 282          * NFSv4 servers do not return entries for '.' and '..'
 283          * Therefore, we fake these entries here.  We let '.'
 284          * have cookie 0 and '..' have cookie 1.  Note that
 285          * when talking to the server, we always send cookie 0
 286          * instead of 1 or 2.
 287          */
 288         start = p = kmap_atomic(*readdir->pages);
 289
 290         if (cookie == 0) {
 291                 *p++ = xdr_one;                                  /* next */
 292                 *p++ = xdr_zero;                   /* cookie, first word */
 293                 *p++ = xdr_one;                   /* cookie, second word */
 294                 *p++ = xdr_one;                             /* entry len */
 295                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 296                 p++;
 297                 *p++ = xdr_one;                         /* bitmap length */
 298                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 299                 *p++ = htonl(8);              /* attribute buffer length */
 300                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 301         }
 302
 303         *p++ = xdr_one;                                  /* next */
 304         *p++ = xdr_zero;                   /* cookie, first word */
 305         *p++ = xdr_two;                   /* cookie, second word */
 306         *p++ = xdr_two;                             /* entry len */
 307         memcpy(p, "..\0\0", 4);                         /* entry */
 308         p++;
 309         *p++ = xdr_one;                         /* bitmap length */
 310         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 311         *p++ = htonl(8);              /* attribute buffer length */
 312         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 313
 314         readdir->pgbase = (char *)p - (char *)start;
 315         readdir->count -= readdir->pgbase;
 316         kunmap_atomic(start);
 317 }
 318
 319 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 320 {
 321         int res = 0;
 322
 323         might_sleep();
 324
 325         if (*timeout <= 0)
 326                 *timeout = NFS4_POLL_RETRY_MIN;
 327         if (*timeout > NFS4_POLL_RETRY_MAX)
 328                 *timeout = NFS4_POLL_RETRY_MAX;
 329         freezable_schedule_timeout_killable_unsafe(*timeout);
 330         if (fatal_signal_pending(current))
 331                 res = -ERESTARTSYS;
 332         *timeout <<= 1;
 333         return res;
 334 }
 335
 336 /* This is the error handling routine for processes that are allowed
 337  * to sleep.
 338  */
 339 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 340 {
 341         struct nfs_client *clp = server->nfs_client;
 342         struct nfs4_state *state = exception->state;
 343         struct inode *inode = exception->inode;
 344         int ret = errorcode;
 345
 346         exception->retry = 0;
 347         switch(errorcode) {
 348                 case 0:
 349                         return 0;
 350                 case -NFS4ERR_OPENMODE:
 351                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 352                                 nfs4_inode_return_delegation(inode);
 353                                 exception->retry = 1;
 354                                 return 0;
 355                         }
 356                         if (state == NULL)
 357                                 break;
 358                         ret = nfs4_schedule_stateid_recovery(server, state);
 359                         if (ret < 0)
 360                                 break;
 361                         goto wait_on_recovery;
 362                 case -NFS4ERR_DELEG_REVOKED:
 363                 case -NFS4ERR_ADMIN_REVOKED:
 364                 case -NFS4ERR_BAD_STATEID:
 365                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 366                                 nfs_remove_bad_delegation(inode);
 367                                 exception->retry = 1;
 368                                 break;
 369                         }
 370                         if (state == NULL)
 371                                 break;
 372                         ret = nfs4_schedule_stateid_recovery(server, state);
 373                         if (ret < 0)
 374                                 break;
 375                         goto wait_on_recovery;
 376                 case -NFS4ERR_EXPIRED:
 377                         if (state != NULL) {
 378                                 ret = nfs4_schedule_stateid_recovery(server, state);
 379                                 if (ret < 0)
 380                                         break;
 381                         }
 382                 case -NFS4ERR_STALE_STATEID:
 383                 case -NFS4ERR_STALE_CLIENTID:
 384                         nfs4_schedule_lease_recovery(clp);
 385                         goto wait_on_recovery;
 386 #if defined(CONFIG_NFS_V4_1)
 387                 case -NFS4ERR_BADSESSION:
 388                 case -NFS4ERR_BADSLOT:
 389                 case -NFS4ERR_BAD_HIGH_SLOT:
 390                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 391                 case -NFS4ERR_DEADSESSION:
 392                 case -NFS4ERR_SEQ_FALSE_RETRY:
 393                 case -NFS4ERR_SEQ_MISORDERED:
 394                         dprintk("%s ERROR: %d Reset session\n", __func__,
 395                                 errorcode);
 396                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 397                         goto wait_on_recovery;
 398 #endif /* defined(CONFIG_NFS_V4_1) */
 399                 case -NFS4ERR_FILE_OPEN:
 400                         if (exception->timeout > HZ) {
 401                                 /* We have retried a decent amount, time to
 402                                  * fail
 403                                  */
 404                                 ret = -EBUSY;
 405                                 break;
 406                         }
 407                 case -NFS4ERR_GRACE:
 408                 case -NFS4ERR_DELAY:
 409                         ret = nfs4_delay(server->client, &exception->timeout);
 410                         if (ret != 0)
 411                                 break;
 412                 case -NFS4ERR_RETRY_UNCACHED_REP:
 413                 case -NFS4ERR_OLD_STATEID:
 414                         exception->retry = 1;
 415                         break;
 416                 case -NFS4ERR_BADOWNER:
 417                         /* The following works around a Linux server bug! */
 418                 case -NFS4ERR_BADNAME:
 419                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 420                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 421                                 exception->retry = 1;
 422                                 printk(KERN_WARNING "NFS: v4 server %s "
 423                                                 "does not accept raw "
 424                                                 "uid/gids. "
 425                                                 "Reenabling the idmapper.\n",
 426                                                 server->nfs_client->cl_hostname);
 427                         }
 428         }
 429         /* We failed to handle the error */
 430         return nfs4_map_errors(ret);
 431 wait_on_recovery:
 432         ret = nfs4_wait_clnt_recover(clp);
 433         if (ret == 0)
 434                 exception->retry = 1;
 435         return ret;
 436 }
 437
 438
 439 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 440 {
 441         spin_lock(&clp->cl_lock);
 442         if (time_before(clp->cl_last_renewal,timestamp))
 443                 clp->cl_last_renewal = timestamp;
 444         spin_unlock(&clp->cl_lock);
 445 }
 446
 447 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 448 {
 449         do_renew_lease(server->nfs_client, timestamp);
 450 }
 451
 452 #if defined(CONFIG_NFS_V4_1)
 453
 454 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 455 {
 456         struct nfs4_session *session;
 457         struct nfs4_slot_table *tbl;
 458         bool send_new_highest_used_slotid = false;
 459
 460         if (!res->sr_slot) {
 461                 /* just wake up the next guy waiting since
 462                  * we may have not consumed a slot after all */
 463                 dprintk("%s: No slot\n", __func__);
 464                 return;
 465         }
 466         tbl = res->sr_slot->table;
 467         session = tbl->session;
 468
 469         spin_lock(&tbl->slot_tbl_lock);
 470         /* Be nice to the server: try to ensure that the last transmitted
 471          * value for highest_user_slotid <= target_highest_slotid
 472          */
 473         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 474                 send_new_highest_used_slotid = true;
 475
 476         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 477                 send_new_highest_used_slotid = false;
 478                 goto out_unlock;
 479         }
 480         nfs4_free_slot(tbl, res->sr_slot);
 481
 482         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 483                 send_new_highest_used_slotid = false;
 484 out_unlock:
 485         spin_unlock(&tbl->slot_tbl_lock);
 486         res->sr_slot = NULL;
 487         if (send_new_highest_used_slotid)
 488                 nfs41_server_notify_highest_slotid_update(session->clp);
 489 }
 490
 491 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 492 {
 493         struct nfs4_session *session;
 494         struct nfs4_slot *slot;
 495         struct nfs_client *clp;
 496         bool interrupted = false;
 497         int ret = 1;
 498
 499         /* don't increment the sequence number if the task wasn't sent */
 500         if (!RPC_WAS_SENT(task))
 501                 goto out;
 502
 503         slot = res->sr_slot;
 504         session = slot->table->session;
 505
 506         if (slot->interrupted) {
 507                 slot->interrupted = 0;
 508                 interrupted = true;
 509         }
 510
 511         /* Check the SEQUENCE operation status */
 512         switch (res->sr_status) {
 513         case 0:
 514                 /* Update the slot's sequence and clientid lease timer */
 515                 ++slot->seq_nr;
 516                 clp = session->clp;
 517                 do_renew_lease(clp, res->sr_timestamp);
 518                 /* Check sequence flags */
 519                 if (res->sr_status_flags != 0)
 520                         nfs4_schedule_lease_recovery(clp);
 521                 nfs41_update_target_slotid(slot->table, slot, res);
 522                 break;
 523         case 1:
 524                 /*
 525                  * sr_status remains 1 if an RPC level error occurred.
 526                  * The server may or may not have processed the sequence
 527                  * operation..
 528                  * Mark the slot as having hosted an interrupted RPC call.
 529                  */
 530                 slot->interrupted = 1;
 531                 goto out;
 532         case -NFS4ERR_DELAY:
 533                 /* The server detected a resend of the RPC call and
 534                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 535                  * of RFC5661.
 536                  */
 537                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 538                         __func__,
 539                         slot->slot_nr,
 540                         slot->seq_nr);
 541                 goto out_retry;
 542         case -NFS4ERR_BADSLOT:
 543                 /*
 544                  * The slot id we used was probably retired. Try again
 545                  * using a different slot id.
 546                  */
 547                 goto retry_nowait;
 548         case -NFS4ERR_SEQ_MISORDERED:
 549                 /*
 550                  * Was the last operation on this sequence interrupted?
 551                  * If so, retry after bumping the sequence number.
 552                  */
 553                 if (interrupted) {
 554                         ++slot->seq_nr;
 555                         goto retry_nowait;
 556                 }
 557                 /*
 558                  * Could this slot have been previously retired?
 559                  * If so, then the server may be expecting seq_nr = 1!
 560                  */
 561                 if (slot->seq_nr != 1) {
 562                         slot->seq_nr = 1;
 563                         goto retry_nowait;
 564                 }
 565                 break;
 566         case -NFS4ERR_SEQ_FALSE_RETRY:
 567                 ++slot->seq_nr;
 568                 goto retry_nowait;
 569         default:
 570                 /* Just update the slot sequence no. */
 571                 ++slot->seq_nr;
 572         }
 573 out:
 574         /* The session may be reset by one of the error handlers. */
 575         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 576         nfs41_sequence_free_slot(res);
 577         return ret;
 578 retry_nowait:
 579         if (rpc_restart_call_prepare(task)) {
 580                 task->tk_status = 0;
 581                 ret = 0;
 582         }
 583         goto out;
 584 out_retry:
 585         if (!rpc_restart_call(task))
 586                 goto out;
 587         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 588         return 0;
 589 }
 590
 591 static int nfs4_sequence_done(struct rpc_task *task,
 592                                struct nfs4_sequence_res *res)
 593 {
 594         if (res->sr_slot == NULL)
 595                 return 1;
 596         return nfs41_sequence_done(task, res);
 597 }
 598
 599 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 600                 struct nfs4_sequence_res *res, int cache_reply)
 601 {
 602         args->sa_slot = NULL;
 603         args->sa_cache_this = 0;
 604         args->sa_privileged = 0;
 605         if (cache_reply)
 606                 args->sa_cache_this = 1;
 607         res->sr_slot = NULL;
 608 }
 609
 610 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 611 {
 612         args->sa_privileged = 1;
 613 }
 614
 615 int nfs41_setup_sequence(struct nfs4_session *session,
 616                                 struct nfs4_sequence_args *args,
 617                                 struct nfs4_sequence_res *res,
 618                                 struct rpc_task *task)
 619 {
 620         struct nfs4_slot *slot;
 621         struct nfs4_slot_table *tbl;
 622
 623         dprintk("--> %s\n", __func__);
 624         /* slot already allocated? */
 625         if (res->sr_slot != NULL)
 626                 goto out_success;
 627
 628         tbl = &session->fc_slot_table;
 629
 630         task->tk_timeout = 0;
 631
 632         spin_lock(&tbl->slot_tbl_lock);
 633         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 634             !args->sa_privileged) {
 635                 /* The state manager will wait until the slot table is empty */
 636                 dprintk("%s session is draining\n", __func__);
 637                 goto out_sleep;
 638         }
 639
 640         slot = nfs4_alloc_slot(tbl);
 641         if (IS_ERR(slot)) {
 642                 /* If out of memory, try again in 1/4 second */
 643                 if (slot == ERR_PTR(-ENOMEM))
 644                         task->tk_timeout = HZ >> 2;
 645                 dprintk("<-- %s: no free slots\n", __func__);
 646                 goto out_sleep;
 647         }
 648         spin_unlock(&tbl->slot_tbl_lock);
 649
 650         args->sa_slot = slot;
 651
 652         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 653                         slot->slot_nr, slot->seq_nr);
 654
 655         res->sr_slot = slot;
 656         res->sr_timestamp = jiffies;
 657         res->sr_status_flags = 0;
 658         /*
 659          * sr_status is only set in decode_sequence, and so will remain
 660          * set to 1 if an rpc level failure occurs.
 661          */
 662         res->sr_status = 1;
 663 out_success:
 664         rpc_call_start(task);
 665         return 0;
 666 out_sleep:
 667         /* Privileged tasks are queued with top priority */
 668         if (args->sa_privileged)
 669                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 670                                 NULL, RPC_PRIORITY_PRIVILEGED);
 671         else
 672                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 673         spin_unlock(&tbl->slot_tbl_lock);
 674         return -EAGAIN;
 675 }
 676 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 677
 678 int nfs4_setup_sequence(const struct nfs_server *server,
 679                         struct nfs4_sequence_args *args,
 680                         struct nfs4_sequence_res *res,
 681                         struct rpc_task *task)
 682 {
 683         struct nfs4_session *session = nfs4_get_session(server);
 684         int ret = 0;
 685
 686         if (session == NULL) {
 687                 rpc_call_start(task);
 688                 goto out;
 689         }
 690
 691         dprintk("--> %s clp %p session %p sr_slot %d\n",
 692                 __func__, session->clp, session, res->sr_slot ?
 693                         res->sr_slot->slot_nr : -1);
 694
 695         ret = nfs41_setup_sequence(session, args, res, task);
 696 out:
 697         dprintk("<-- %s status=%d\n", __func__, ret);
 698         return ret;
 699 }
 700
 701 struct nfs41_call_sync_data {
 702         const struct nfs_server *seq_server;
 703         struct nfs4_sequence_args *seq_args;
 704         struct nfs4_sequence_res *seq_res;
 705 };
 706
 707 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 708 {
 709         struct nfs41_call_sync_data *data = calldata;
 710         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 711
 712         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 713
 714         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 715 }
 716
 717 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 718 {
 719         struct nfs41_call_sync_data *data = calldata;
 720
 721         nfs41_sequence_done(task, data->seq_res);
 722 }
 723
 724 static const struct rpc_call_ops nfs41_call_sync_ops = {
 725         .rpc_call_prepare = nfs41_call_sync_prepare,
 726         .rpc_call_done = nfs41_call_sync_done,
 727 };
 728
 729 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 730                                    struct nfs_server *server,
 731                                    struct rpc_message *msg,
 732                                    struct nfs4_sequence_args *args,
 733                                    struct nfs4_sequence_res *res)
 734 {
 735         int ret;
 736         struct rpc_task *task;
 737         struct nfs41_call_sync_data data = {
 738                 .seq_server = server,
 739                 .seq_args = args,
 740                 .seq_res = res,
 741         };
 742         struct rpc_task_setup task_setup = {
 743                 .rpc_client = clnt,
 744                 .rpc_message = msg,
 745                 .callback_ops = &nfs41_call_sync_ops,
 746                 .callback_data = &data
 747         };
 748
 749         task = rpc_run_task(&task_setup);
 750         if (IS_ERR(task))
 751                 ret = PTR_ERR(task);
 752         else {
 753                 ret = task->tk_status;
 754                 rpc_put_task(task);
 755         }
 756         return ret;
 757 }
 758
 759 #else
 760 static
 761 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 762                 struct nfs4_sequence_res *res, int cache_reply)
 763 {
 764 }
 765
 766 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 767 {
 768 }
 769
 770
 771 static int nfs4_sequence_done(struct rpc_task *task,
 772                                struct nfs4_sequence_res *res)
 773 {
 774         return 1;
 775 }
 776 #endif /* CONFIG_NFS_V4_1 */
 777
 778 static
 779 int _nfs4_call_sync(struct rpc_clnt *clnt,
 780                     struct nfs_server *server,
 781                     struct rpc_message *msg,
 782                     struct nfs4_sequence_args *args,
 783                     struct nfs4_sequence_res *res)
 784 {
 785         return rpc_call_sync(clnt, msg, 0);
 786 }
 787
 788 static
 789 int nfs4_call_sync(struct rpc_clnt *clnt,
 790                    struct nfs_server *server,
 791                    struct rpc_message *msg,
 792                    struct nfs4_sequence_args *args,
 793                    struct nfs4_sequence_res *res,
 794                    int cache_reply)
 795 {
 796         nfs41_init_sequence(args, res, cache_reply);
 797         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 798                                                 args, res);
 799 }
 800
 801 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 802 {
 803         struct nfs_inode *nfsi = NFS_I(dir);
 804
 805         spin_lock(&dir->i_lock);
 806         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 807         if (!cinfo->atomic || cinfo->before != dir->i_version)
 808                 nfs_force_lookup_revalidate(dir);
 809         dir->i_version = cinfo->after;
 810         nfs_fscache_invalidate(dir);
 811         spin_unlock(&dir->i_lock);
 812 }
 813
 814 struct nfs4_opendata {
 815         struct kref kref;
 816         struct nfs_openargs o_arg;
 817         struct nfs_openres o_res;
 818         struct nfs_open_confirmargs c_arg;
 819         struct nfs_open_confirmres c_res;
 820         struct nfs4_string owner_name;
 821         struct nfs4_string group_name;
 822         struct nfs_fattr f_attr;
 823         struct nfs4_label *f_label;
 824         struct dentry *dir;
 825         struct dentry *dentry;
 826         struct nfs4_state_owner *owner;
 827         struct nfs4_state *state;
 828         struct iattr attrs;
 829         unsigned long timestamp;
 830         unsigned int rpc_done : 1;
 831         unsigned int is_recover : 1;
 832         int rpc_status;
 833         int cancelled;
 834 };
 835
 836 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 837                 int err, struct nfs4_exception *exception)
 838 {
 839         if (err != -EINVAL)
 840                 return false;
 841         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 842                 return false;
 843         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 844         exception->retry = 1;
 845         return true;
 846 }
 847
 848 static enum open_claim_type4
 849 nfs4_map_atomic_open_claim(struct nfs_server *server,
 850                 enum open_claim_type4 claim)
 851 {
 852         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 853                 return claim;
 854         switch (claim) {
 855         default:
 856                 return claim;
 857         case NFS4_OPEN_CLAIM_FH:
 858                 return NFS4_OPEN_CLAIM_NULL;
 859         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 860                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 861         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 862                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 863         }
 864 }
 865
 866 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 867 {
 868         p->o_res.f_attr = &p->f_attr;
 869         p->o_res.f_label = p->f_label;
 870         p->o_res.seqid = p->o_arg.seqid;
 871         p->c_res.seqid = p->c_arg.seqid;
 872         p->o_res.server = p->o_arg.server;
 873         p->o_res.access_request = p->o_arg.access;
 874         nfs_fattr_init(&p->f_attr);
 875         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 876 }
 877
 878 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 879                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 880                 const struct iattr *attrs,
 881                 struct nfs4_label *label,
 882                 enum open_claim_type4 claim,
 883                 gfp_t gfp_mask)
 884 {
 885         struct dentry *parent = dget_parent(dentry);
 886         struct inode *dir = parent->d_inode;
 887         struct nfs_server *server = NFS_SERVER(dir);
 888         struct nfs4_opendata *p;
 889
 890         p = kzalloc(sizeof(*p), gfp_mask);
 891         if (p == NULL)
 892                 goto err;
 893
 894         p->f_label = nfs4_label_alloc(server, gfp_mask);
 895         if (IS_ERR(p->f_label))
 896                 goto err_free_p;
 897
 898         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 899         if (p->o_arg.seqid == NULL)
 900                 goto err_free_label;
 901         nfs_sb_active(dentry->d_sb);
 902         p->dentry = dget(dentry);
 903         p->dir = parent;
 904         p->owner = sp;
 905         atomic_inc(&sp->so_count);
 906         p->o_arg.open_flags = flags;
 907         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 908         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 909          * will return permission denied for all bits until close */
 910         if (!(flags & O_EXCL)) {
 911                 /* ask server to check for all possible rights as results
 912                  * are cached */
 913                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 914                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 915         }
 916         p->o_arg.clientid = server->nfs_client->cl_clientid;
 917         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 918         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 919         p->o_arg.name = &dentry->d_name;
 920         p->o_arg.server = server;
 921         p->o_arg.bitmask = nfs4_bitmask(server, label);
 922         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 923         p->o_arg.label = label;
 924         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
 925         switch (p->o_arg.claim) {
 926         case NFS4_OPEN_CLAIM_NULL:
 927         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 928         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 929                 p->o_arg.fh = NFS_FH(dir);
 930                 break;
 931         case NFS4_OPEN_CLAIM_PREVIOUS:
 932         case NFS4_OPEN_CLAIM_FH:
 933         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 934         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 935                 p->o_arg.fh = NFS_FH(dentry->d_inode);
 936         }
 937         if (attrs != NULL && attrs->ia_valid != 0) {
 938                 __u32 verf[2];
 939
 940                 p->o_arg.u.attrs = &p->attrs;
 941                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 942
 943                 verf[0] = jiffies;
 944                 verf[1] = current->pid;
 945                 memcpy(p->o_arg.u.verifier.data, verf,
 946                                 sizeof(p->o_arg.u.verifier.data));
 947         }
 948         p->c_arg.fh = &p->o_res.fh;
 949         p->c_arg.stateid = &p->o_res.stateid;
 950         p->c_arg.seqid = p->o_arg.seqid;
 951         nfs4_init_opendata_res(p);
 952         kref_init(&p->kref);
 953         return p;
 954
 955 err_free_label:
 956         nfs4_label_free(p->f_label);
 957 err_free_p:
 958         kfree(p);
 959 err:
 960         dput(parent);
 961         return NULL;
 962 }
 963
 964 static void nfs4_opendata_free(struct kref *kref)
 965 {
 966         struct nfs4_opendata *p = container_of(kref,
 967                         struct nfs4_opendata, kref);
 968         struct super_block *sb = p->dentry->d_sb;
 969
 970         nfs_free_seqid(p->o_arg.seqid);
 971         if (p->state != NULL)
 972                 nfs4_put_open_state(p->state);
 973         nfs4_put_state_owner(p->owner);
 974
 975         nfs4_label_free(p->f_label);
 976
 977         dput(p->dir);
 978         dput(p->dentry);
 979         nfs_sb_deactive(sb);
 980         nfs_fattr_free_names(&p->f_attr);
 981         kfree(p);
 982 }
 983
 984 static void nfs4_opendata_put(struct nfs4_opendata *p)
 985 {
 986         if (p != NULL)
 987                 kref_put(&p->kref, nfs4_opendata_free);
 988 }
 989
 990 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 991 {
 992         int ret;
 993
 994         ret = rpc_wait_for_completion_task(task);
 995         return ret;
 996 }
 997
 998 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 999 {
1000         int ret = 0;
1001
1002         if (open_mode & (O_EXCL|O_TRUNC))
1003                 goto out;
1004         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1005                 case FMODE_READ:
1006                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1007                                 && state->n_rdonly != 0;
1008                         break;
1009                 case FMODE_WRITE:
1010                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1011                                 && state->n_wronly != 0;
1012                         break;
1013                 case FMODE_READ|FMODE_WRITE:
1014                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1015                                 && state->n_rdwr != 0;
1016         }
1017 out:
1018         return ret;
1019 }
1020
1021 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1022 {
1023         if (delegation == NULL)
1024                 return 0;
1025         if ((delegation->type & fmode) != fmode)
1026                 return 0;
1027         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1028                 return 0;
1029         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1030                 return 0;
1031         nfs_mark_delegation_referenced(delegation);
1032         return 1;
1033 }
1034
1035 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1036 {
1037         switch (fmode) {
1038                 case FMODE_WRITE:
1039                         state->n_wronly++;
1040                         break;
1041                 case FMODE_READ:
1042                         state->n_rdonly++;
1043                         break;
1044                 case FMODE_READ|FMODE_WRITE:
1045                         state->n_rdwr++;
1046         }
1047         nfs4_state_set_mode_locked(state, state->state | fmode);
1048 }
1049
1050 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1051 {
1052         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1053                 nfs4_stateid_copy(&state->stateid, stateid);
1054         nfs4_stateid_copy(&state->open_stateid, stateid);
1055         set_bit(NFS_OPEN_STATE, &state->flags);
1056         switch (fmode) {
1057                 case FMODE_READ:
1058                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1059                         break;
1060                 case FMODE_WRITE:
1061                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1062                         break;
1063                 case FMODE_READ|FMODE_WRITE:
1064                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1065         }
1066 }
1067
1068 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1069 {
1070         write_seqlock(&state->seqlock);
1071         nfs_set_open_stateid_locked(state, stateid, fmode);
1072         write_sequnlock(&state->seqlock);
1073 }
1074
1075 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1076 {
1077         /*
1078          * Protect the call to nfs4_state_set_mode_locked and
1079          * serialise the stateid update
1080          */
1081         write_seqlock(&state->seqlock);
1082         if (deleg_stateid != NULL) {
1083                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1084                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1085         }
1086         if (open_stateid != NULL)
1087                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1088         write_sequnlock(&state->seqlock);
1089         spin_lock(&state->owner->so_lock);
1090         update_open_stateflags(state, fmode);
1091         spin_unlock(&state->owner->so_lock);
1092 }
1093
1094 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1095 {
1096         struct nfs_inode *nfsi = NFS_I(state->inode);
1097         struct nfs_delegation *deleg_cur;
1098         int ret = 0;
1099
1100         fmode &= (FMODE_READ|FMODE_WRITE);
1101
1102         rcu_read_lock();
1103         deleg_cur = rcu_dereference(nfsi->delegation);
1104         if (deleg_cur == NULL)
1105                 goto no_delegation;
1106
1107         spin_lock(&deleg_cur->lock);
1108         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1109            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1110             (deleg_cur->type & fmode) != fmode)
1111                 goto no_delegation_unlock;
1112
1113         if (delegation == NULL)
1114                 delegation = &deleg_cur->stateid;
1115         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1116                 goto no_delegation_unlock;
1117
1118         nfs_mark_delegation_referenced(deleg_cur);
1119         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1120         ret = 1;
1121 no_delegation_unlock:
1122         spin_unlock(&deleg_cur->lock);
1123 no_delegation:
1124         rcu_read_unlock();
1125
1126         if (!ret && open_stateid != NULL) {
1127                 __update_open_stateid(state, open_stateid, NULL, fmode);
1128                 ret = 1;
1129         }
1130
1131         return ret;
1132 }
1133
1134
1135 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1136 {
1137         struct nfs_delegation *delegation;
1138
1139         rcu_read_lock();
1140         delegation = rcu_dereference(NFS_I(inode)->delegation);
1141         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1142                 rcu_read_unlock();
1143                 return;
1144         }
1145         rcu_read_unlock();
1146         nfs4_inode_return_delegation(inode);
1147 }
1148
1149 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1150 {
1151         struct nfs4_state *state = opendata->state;
1152         struct nfs_inode *nfsi = NFS_I(state->inode);
1153         struct nfs_delegation *delegation;
1154         int open_mode = opendata->o_arg.open_flags;
1155         fmode_t fmode = opendata->o_arg.fmode;
1156         nfs4_stateid stateid;
1157         int ret = -EAGAIN;
1158
1159         for (;;) {
1160                 if (can_open_cached(state, fmode, open_mode)) {
1161                         spin_lock(&state->owner->so_lock);
1162                         if (can_open_cached(state, fmode, open_mode)) {
1163                                 update_open_stateflags(state, fmode);
1164                                 spin_unlock(&state->owner->so_lock);
1165                                 goto out_return_state;
1166                         }
1167                         spin_unlock(&state->owner->so_lock);
1168                 }
1169                 rcu_read_lock();
1170                 delegation = rcu_dereference(nfsi->delegation);
1171                 if (!can_open_delegated(delegation, fmode)) {
1172                         rcu_read_unlock();
1173                         break;
1174                 }
1175                 /* Save the delegation */
1176                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1177                 rcu_read_unlock();
1178                 nfs_release_seqid(opendata->o_arg.seqid);
1179                 if (!opendata->is_recover) {
1180                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1181                         if (ret != 0)
1182                                 goto out;
1183                 }
1184                 ret = -EAGAIN;
1185
1186                 /* Try to update the stateid using the delegation */
1187                 if (update_open_stateid(state, NULL, &stateid, fmode))
1188                         goto out_return_state;
1189         }
1190 out:
1191         return ERR_PTR(ret);
1192 out_return_state:
1193         atomic_inc(&state->count);
1194         return state;
1195 }
1196
1197 static void
1198 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1199 {
1200         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1201         struct nfs_delegation *delegation;
1202         int delegation_flags = 0;
1203
1204         rcu_read_lock();
1205         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1206         if (delegation)
1207                 delegation_flags = delegation->flags;
1208         rcu_read_unlock();
1209         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1210                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1211                                    "returning a delegation for "
1212                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1213                                    clp->cl_hostname);
1214         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1215                 nfs_inode_set_delegation(state->inode,
1216                                          data->owner->so_cred,
1217                                          &data->o_res);
1218         else
1219                 nfs_inode_reclaim_delegation(state->inode,
1220                                              data->owner->so_cred,
1221                                              &data->o_res);
1222 }
1223
1224 /*
1225  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1226  * and update the nfs4_state.
1227  */
1228 static struct nfs4_state *
1229 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1230 {
1231         struct inode *inode = data->state->inode;
1232         struct nfs4_state *state = data->state;
1233         int ret;
1234
1235         if (!data->rpc_done) {
1236                 ret = data->rpc_status;
1237                 goto err;
1238         }
1239
1240         ret = -ESTALE;
1241         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1242             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1243             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1244                 goto err;
1245
1246         ret = -ENOMEM;
1247         state = nfs4_get_open_state(inode, data->owner);
1248         if (state == NULL)
1249                 goto err;
1250
1251         ret = nfs_refresh_inode(inode, &data->f_attr);
1252         if (ret)
1253                 goto err;
1254
1255         nfs_setsecurity(inode, &data->f_attr, data->f_label);
1256
1257         if (data->o_res.delegation_type != 0)
1258                 nfs4_opendata_check_deleg(data, state);
1259         update_open_stateid(state, &data->o_res.stateid, NULL,
1260                             data->o_arg.fmode);
1261
1262         return state;
1263 err:
1264         return ERR_PTR(ret);
1265
1266 }
1267
1268 static struct nfs4_state *
1269 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1270 {
1271         struct inode *inode;
1272         struct nfs4_state *state = NULL;
1273         int ret;
1274
1275         if (!data->rpc_done) {
1276                 state = nfs4_try_open_cached(data);
1277                 goto out;
1278         }
1279
1280         ret = -EAGAIN;
1281         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1282                 goto err;
1283         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1284         ret = PTR_ERR(inode);
1285         if (IS_ERR(inode))
1286                 goto err;
1287         ret = -ENOMEM;
1288         state = nfs4_get_open_state(inode, data->owner);
1289         if (state == NULL)
1290                 goto err_put_inode;
1291         if (data->o_res.delegation_type != 0)
1292                 nfs4_opendata_check_deleg(data, state);
1293         update_open_stateid(state, &data->o_res.stateid, NULL,
1294                         data->o_arg.fmode);
1295         iput(inode);
1296 out:
1297         nfs_release_seqid(data->o_arg.seqid);
1298         return state;
1299 err_put_inode:
1300         iput(inode);
1301 err:
1302         return ERR_PTR(ret);
1303 }
1304
1305 static struct nfs4_state *
1306 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1307 {
1308         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1309                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1310         return _nfs4_opendata_to_nfs4_state(data);
1311 }
1312
1313 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1314 {
1315         struct nfs_inode *nfsi = NFS_I(state->inode);
1316         struct nfs_open_context *ctx;
1317
1318         spin_lock(&state->inode->i_lock);
1319         list_for_each_entry(ctx, &nfsi->open_files, list) {
1320                 if (ctx->state != state)
1321                         continue;
1322                 get_nfs_open_context(ctx);
1323                 spin_unlock(&state->inode->i_lock);
1324                 return ctx;
1325         }
1326         spin_unlock(&state->inode->i_lock);
1327         return ERR_PTR(-ENOENT);
1328 }
1329
1330 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1331                 struct nfs4_state *state, enum open_claim_type4 claim)
1332 {
1333         struct nfs4_opendata *opendata;
1334
1335         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1336                         NULL, NULL, claim, GFP_NOFS);
1337         if (opendata == NULL)
1338                 return ERR_PTR(-ENOMEM);
1339         opendata->state = state;
1340         atomic_inc(&state->count);
1341         return opendata;
1342 }
1343
1344 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1345 {
1346         struct nfs4_state *newstate;
1347         int ret;
1348
1349         opendata->o_arg.open_flags = 0;
1350         opendata->o_arg.fmode = fmode;
1351         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1352         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1353         nfs4_init_opendata_res(opendata);
1354         ret = _nfs4_recover_proc_open(opendata);
1355         if (ret != 0)
1356                 return ret;
1357         newstate = nfs4_opendata_to_nfs4_state(opendata);
1358         if (IS_ERR(newstate))
1359                 return PTR_ERR(newstate);
1360         nfs4_close_state(newstate, fmode);
1361         *res = newstate;
1362         return 0;
1363 }
1364
1365 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1366 {
1367         struct nfs4_state *newstate;
1368         int ret;
1369
1370         /* memory barrier prior to reading state->n_* */
1371         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1372         clear_bit(NFS_OPEN_STATE, &state->flags);
1373         smp_rmb();
1374         if (state->n_rdwr != 0) {
1375                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1376                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1377                 if (ret != 0)
1378                         return ret;
1379                 if (newstate != state)
1380                         return -ESTALE;
1381         }
1382         if (state->n_wronly != 0) {
1383                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1384                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1385                 if (ret != 0)
1386                         return ret;
1387                 if (newstate != state)
1388                         return -ESTALE;
1389         }
1390         if (state->n_rdonly != 0) {
1391                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1392                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1393                 if (ret != 0)
1394                         return ret;
1395                 if (newstate != state)
1396                         return -ESTALE;
1397         }
1398         /*
1399          * We may have performed cached opens for all three recoveries.
1400          * Check if we need to update the current stateid.
1401          */
1402         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1403             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1404                 write_seqlock(&state->seqlock);
1405                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1406                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1407                 write_sequnlock(&state->seqlock);
1408         }
1409         return 0;
1410 }
1411
1412 /*
1413  * OPEN_RECLAIM:
1414  *      reclaim state on the server after a reboot.
1415  */
1416 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1417 {
1418         struct nfs_delegation *delegation;
1419         struct nfs4_opendata *opendata;
1420         fmode_t delegation_type = 0;
1421         int status;
1422
1423         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1424                         NFS4_OPEN_CLAIM_PREVIOUS);
1425         if (IS_ERR(opendata))
1426                 return PTR_ERR(opendata);
1427         rcu_read_lock();
1428         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1429         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1430                 delegation_type = delegation->type;
1431         rcu_read_unlock();
1432         opendata->o_arg.u.delegation_type = delegation_type;
1433         status = nfs4_open_recover(opendata, state);
1434         nfs4_opendata_put(opendata);
1435         return status;
1436 }
1437
1438 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1439 {
1440         struct nfs_server *server = NFS_SERVER(state->inode);
1441         struct nfs4_exception exception = { };
1442         int err;
1443         do {
1444                 err = _nfs4_do_open_reclaim(ctx, state);
1445                 trace_nfs4_open_reclaim(ctx, 0, err);
1446                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1447                         continue;
1448                 if (err != -NFS4ERR_DELAY)
1449                         break;
1450                 nfs4_handle_exception(server, err, &exception);
1451         } while (exception.retry);
1452         return err;
1453 }
1454
1455 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1456 {
1457         struct nfs_open_context *ctx;
1458         int ret;
1459
1460         ctx = nfs4_state_find_open_context(state);
1461         if (IS_ERR(ctx))
1462                 return -EAGAIN;
1463         ret = nfs4_do_open_reclaim(ctx, state);
1464         put_nfs_open_context(ctx);
1465         return ret;
1466 }
1467
1468 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1469 {
1470         switch (err) {
1471                 default:
1472                         printk(KERN_ERR "NFS: %s: unhandled error "
1473                                         "%d.\n", __func__, err);
1474                 case 0:
1475                 case -ENOENT:
1476                 case -ESTALE:
1477                         break;
1478                 case -NFS4ERR_BADSESSION:
1479                 case -NFS4ERR_BADSLOT:
1480                 case -NFS4ERR_BAD_HIGH_SLOT:
1481                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1482                 case -NFS4ERR_DEADSESSION:
1483                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1484                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1485                         return -EAGAIN;
1486                 case -NFS4ERR_STALE_CLIENTID:
1487                 case -NFS4ERR_STALE_STATEID:
1488                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1489                 case -NFS4ERR_EXPIRED:
1490                         /* Don't recall a delegation if it was lost */
1491                         nfs4_schedule_lease_recovery(server->nfs_client);
1492                         return -EAGAIN;
1493                 case -NFS4ERR_DELEG_REVOKED:
1494                 case -NFS4ERR_ADMIN_REVOKED:
1495                 case -NFS4ERR_BAD_STATEID:
1496                 case -NFS4ERR_OPENMODE:
1497                         nfs_inode_find_state_and_recover(state->inode,
1498                                         stateid);
1499                         nfs4_schedule_stateid_recovery(server, state);
1500                         return 0;
1501                 case -NFS4ERR_DELAY:
1502                 case -NFS4ERR_GRACE:
1503                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1504                         ssleep(1);
1505                         return -EAGAIN;
1506                 case -ENOMEM:
1507                 case -NFS4ERR_DENIED:
1508                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1509                         return 0;
1510         }
1511         return err;
1512 }
1513
1514 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1515 {
1516         struct nfs_server *server = NFS_SERVER(state->inode);
1517         struct nfs4_opendata *opendata;
1518         int err;
1519
1520         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1521                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1522         if (IS_ERR(opendata))
1523                 return PTR_ERR(opendata);
1524         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1525         err = nfs4_open_recover(opendata, state);
1526         nfs4_opendata_put(opendata);
1527         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1528 }
1529
1530 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1531 {
1532         struct nfs4_opendata *data = calldata;
1533
1534         data->rpc_status = task->tk_status;
1535         if (data->rpc_status == 0) {
1536                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1537                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1538                 renew_lease(data->o_res.server, data->timestamp);
1539                 data->rpc_done = 1;
1540         }
1541 }
1542
1543 static void nfs4_open_confirm_release(void *calldata)
1544 {
1545         struct nfs4_opendata *data = calldata;
1546         struct nfs4_state *state = NULL;
1547
1548         /* If this request hasn't been cancelled, do nothing */
1549         if (data->cancelled == 0)
1550                 goto out_free;
1551         /* In case of error, no cleanup! */
1552         if (!data->rpc_done)
1553                 goto out_free;
1554         state = nfs4_opendata_to_nfs4_state(data);
1555         if (!IS_ERR(state))
1556                 nfs4_close_state(state, data->o_arg.fmode);
1557 out_free:
1558         nfs4_opendata_put(data);
1559 }
1560
1561 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1562         .rpc_call_done = nfs4_open_confirm_done,
1563         .rpc_release = nfs4_open_confirm_release,
1564 };
1565
1566 /*
1567  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1568  */
1569 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1570 {
1571         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1572         struct rpc_task *task;
1573         struct  rpc_message msg = {
1574                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1575                 .rpc_argp = &data->c_arg,
1576                 .rpc_resp = &data->c_res,
1577                 .rpc_cred = data->owner->so_cred,
1578         };
1579         struct rpc_task_setup task_setup_data = {
1580                 .rpc_client = server->client,
1581                 .rpc_message = &msg,
1582                 .callback_ops = &nfs4_open_confirm_ops,
1583                 .callback_data = data,
1584                 .workqueue = nfsiod_workqueue,
1585                 .flags = RPC_TASK_ASYNC,
1586         };
1587         int status;
1588
1589         kref_get(&data->kref);
1590         data->rpc_done = 0;
1591         data->rpc_status = 0;
1592         data->timestamp = jiffies;
1593         task = rpc_run_task(&task_setup_data);
1594         if (IS_ERR(task))
1595                 return PTR_ERR(task);
1596         status = nfs4_wait_for_completion_rpc_task(task);
1597         if (status != 0) {
1598                 data->cancelled = 1;
1599                 smp_wmb();
1600         } else
1601                 status = data->rpc_status;
1602         rpc_put_task(task);
1603         return status;
1604 }
1605
1606 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1607 {
1608         struct nfs4_opendata *data = calldata;
1609         struct nfs4_state_owner *sp = data->owner;
1610         struct nfs_client *clp = sp->so_server->nfs_client;
1611
1612         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1613                 goto out_wait;
1614         /*
1615          * Check if we still need to send an OPEN call, or if we can use
1616          * a delegation instead.
1617          */
1618         if (data->state != NULL) {
1619                 struct nfs_delegation *delegation;
1620
1621                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1622                         goto out_no_action;
1623                 rcu_read_lock();
1624                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1625                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1626                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1627                     can_open_delegated(delegation, data->o_arg.fmode))
1628                         goto unlock_no_action;
1629                 rcu_read_unlock();
1630         }
1631         /* Update client id. */
1632         data->o_arg.clientid = clp->cl_clientid;
1633         switch (data->o_arg.claim) {
1634         case NFS4_OPEN_CLAIM_PREVIOUS:
1635         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1636         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1637                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1638         case NFS4_OPEN_CLAIM_FH:
1639                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1640                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1641         }
1642         data->timestamp = jiffies;
1643         if (nfs4_setup_sequence(data->o_arg.server,
1644                                 &data->o_arg.seq_args,
1645                                 &data->o_res.seq_res,
1646                                 task) != 0)
1647                 nfs_release_seqid(data->o_arg.seqid);
1648
1649         /* Set the create mode (note dependency on the session type) */
1650         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1651         if (data->o_arg.open_flags & O_EXCL) {
1652                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1653                 if (nfs4_has_persistent_session(clp))
1654                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1655                 else if (clp->cl_mvops->minor_version > 0)
1656                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1657         }
1658         return;
1659 unlock_no_action:
1660         rcu_read_unlock();
1661 out_no_action:
1662         task->tk_action = NULL;
1663 out_wait:
1664         nfs4_sequence_done(task, &data->o_res.seq_res);
1665 }
1666
1667 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1668 {
1669         struct nfs4_opendata *data = calldata;
1670
1671         data->rpc_status = task->tk_status;
1672
1673         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1674                 return;
1675
1676         if (task->tk_status == 0) {
1677                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1678                         switch (data->o_res.f_attr->mode & S_IFMT) {
1679                         case S_IFREG:
1680                                 break;
1681                         case S_IFLNK:
1682                                 data->rpc_status = -ELOOP;
1683                                 break;
1684                         case S_IFDIR:
1685                                 data->rpc_status = -EISDIR;
1686                                 break;
1687                         default:
1688                                 data->rpc_status = -ENOTDIR;
1689                         }
1690                 }
1691                 renew_lease(data->o_res.server, data->timestamp);
1692                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1693                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1694         }
1695         data->rpc_done = 1;
1696 }
1697
1698 static void nfs4_open_release(void *calldata)
1699 {
1700         struct nfs4_opendata *data = calldata;
1701         struct nfs4_state *state = NULL;
1702
1703         /* If this request hasn't been cancelled, do nothing */
1704         if (data->cancelled == 0)
1705                 goto out_free;
1706         /* In case of error, no cleanup! */
1707         if (data->rpc_status != 0 || !data->rpc_done)
1708                 goto out_free;
1709         /* In case we need an open_confirm, no cleanup! */
1710         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1711                 goto out_free;
1712         state = nfs4_opendata_to_nfs4_state(data);
1713         if (!IS_ERR(state))
1714                 nfs4_close_state(state, data->o_arg.fmode);
1715 out_free:
1716         nfs4_opendata_put(data);
1717 }
1718
1719 static const struct rpc_call_ops nfs4_open_ops = {
1720         .rpc_call_prepare = nfs4_open_prepare,
1721         .rpc_call_done = nfs4_open_done,
1722         .rpc_release = nfs4_open_release,
1723 };
1724
1725 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1726 {
1727         struct inode *dir = data->dir->d_inode;
1728         struct nfs_server *server = NFS_SERVER(dir);
1729         struct nfs_openargs *o_arg = &data->o_arg;
1730         struct nfs_openres *o_res = &data->o_res;
1731         struct rpc_task *task;
1732         struct rpc_message msg = {
1733                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1734                 .rpc_argp = o_arg,
1735                 .rpc_resp = o_res,
1736                 .rpc_cred = data->owner->so_cred,
1737         };
1738         struct rpc_task_setup task_setup_data = {
1739                 .rpc_client = server->client,
1740                 .rpc_message = &msg,
1741                 .callback_ops = &nfs4_open_ops,
1742                 .callback_data = data,
1743                 .workqueue = nfsiod_workqueue,
1744                 .flags = RPC_TASK_ASYNC,
1745         };
1746         int status;
1747
1748         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1749         kref_get(&data->kref);
1750         data->rpc_done = 0;
1751         data->rpc_status = 0;
1752         data->cancelled = 0;
1753         data->is_recover = 0;
1754         if (isrecover) {
1755                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1756                 data->is_recover = 1;
1757         }
1758         task = rpc_run_task(&task_setup_data);
1759         if (IS_ERR(task))
1760                 return PTR_ERR(task);
1761         status = nfs4_wait_for_completion_rpc_task(task);
1762         if (status != 0) {
1763                 data->cancelled = 1;
1764                 smp_wmb();
1765         } else
1766                 status = data->rpc_status;
1767         rpc_put_task(task);
1768
1769         return status;
1770 }
1771
1772 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1773 {
1774         struct inode *dir = data->dir->d_inode;
1775         struct nfs_openres *o_res = &data->o_res;
1776         int status;
1777
1778         status = nfs4_run_open_task(data, 1);
1779         if (status != 0 || !data->rpc_done)
1780                 return status;
1781
1782         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1783
1784         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1785                 status = _nfs4_proc_open_confirm(data);
1786                 if (status != 0)
1787                         return status;
1788         }
1789
1790         return status;
1791 }
1792
1793 static int nfs4_opendata_access(struct rpc_cred *cred,
1794                                 struct nfs4_opendata *opendata,
1795                                 struct nfs4_state *state, fmode_t fmode,
1796                                 int openflags)
1797 {
1798         struct nfs_access_entry cache;
1799         u32 mask;
1800
1801         /* access call failed or for some reason the server doesn't
1802          * support any access modes -- defer access call until later */
1803         if (opendata->o_res.access_supported == 0)
1804                 return 0;
1805
1806         mask = 0;
1807         /* don't check MAY_WRITE - a newly created file may not have
1808          * write mode bits, but POSIX allows the creating process to write.
1809          * use openflags to check for exec, because fmode won't
1810          * always have FMODE_EXEC set when file open for exec. */
1811         if (openflags & __FMODE_EXEC) {
1812                 /* ONLY check for exec rights */
1813                 mask = MAY_EXEC;
1814         } else if (fmode & FMODE_READ)
1815                 mask = MAY_READ;
1816
1817         cache.cred = cred;
1818         cache.jiffies = jiffies;
1819         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1820         nfs_access_add_cache(state->inode, &cache);
1821
1822         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1823                 return 0;
1824
1825         /* even though OPEN succeeded, access is denied. Close the file */
1826         nfs4_close_state(state, fmode);
1827         return -EACCES;
1828 }
1829
1830 /*
1831  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1832  */
1833 static int _nfs4_proc_open(struct nfs4_opendata *data)
1834 {
1835         struct inode *dir = data->dir->d_inode;
1836         struct nfs_server *server = NFS_SERVER(dir);
1837         struct nfs_openargs *o_arg = &data->o_arg;
1838         struct nfs_openres *o_res = &data->o_res;
1839         int status;
1840
1841         status = nfs4_run_open_task(data, 0);
1842         if (!data->rpc_done)
1843                 return status;
1844         if (status != 0) {
1845                 if (status == -NFS4ERR_BADNAME &&
1846                                 !(o_arg->open_flags & O_CREAT))
1847                         return -ENOENT;
1848                 return status;
1849         }
1850
1851         nfs_fattr_map_and_free_names(server, &data->f_attr);
1852
1853         if (o_arg->open_flags & O_CREAT)
1854                 update_changeattr(dir, &o_res->cinfo);
1855         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1856                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1857         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1858                 status = _nfs4_proc_open_confirm(data);
1859                 if (status != 0)
1860                         return status;
1861         }
1862         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1863                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1864         return 0;
1865 }
1866
1867 static int nfs4_recover_expired_lease(struct nfs_server *server)
1868 {
1869         return nfs4_client_recover_expired_lease(server->nfs_client);
1870 }
1871
1872 /*
1873  * OPEN_EXPIRED:
1874  *      reclaim state on the server after a network partition.
1875  *      Assumes caller holds the appropriate lock
1876  */
1877 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1878 {
1879         struct nfs4_opendata *opendata;
1880         int ret;
1881
1882         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1883                         NFS4_OPEN_CLAIM_FH);
1884         if (IS_ERR(opendata))
1885                 return PTR_ERR(opendata);
1886         ret = nfs4_open_recover(opendata, state);
1887         if (ret == -ESTALE)
1888                 d_drop(ctx->dentry);
1889         nfs4_opendata_put(opendata);
1890         return ret;
1891 }
1892
1893 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1894 {
1895         struct nfs_server *server = NFS_SERVER(state->inode);
1896         struct nfs4_exception exception = { };
1897         int err;
1898
1899         do {
1900                 err = _nfs4_open_expired(ctx, state);
1901                 trace_nfs4_open_expired(ctx, 0, err);
1902                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1903                         continue;
1904                 switch (err) {
1905                 default:
1906                         goto out;
1907                 case -NFS4ERR_GRACE:
1908                 case -NFS4ERR_DELAY:
1909                         nfs4_handle_exception(server, err, &exception);
1910                         err = 0;
1911                 }
1912         } while (exception.retry);
1913 out:
1914         return err;
1915 }
1916
1917 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1918 {
1919         struct nfs_open_context *ctx;
1920         int ret;
1921
1922         ctx = nfs4_state_find_open_context(state);
1923         if (IS_ERR(ctx))
1924                 return -EAGAIN;
1925         ret = nfs4_do_open_expired(ctx, state);
1926         put_nfs_open_context(ctx);
1927         return ret;
1928 }
1929
1930 #if defined(CONFIG_NFS_V4_1)
1931 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1932 {
1933         struct nfs_server *server = NFS_SERVER(state->inode);
1934         nfs4_stateid *stateid = &state->stateid;
1935         struct nfs_delegation *delegation;
1936         struct rpc_cred *cred = NULL;
1937         int status = -NFS4ERR_BAD_STATEID;
1938
1939         /* If a state reset has been done, test_stateid is unneeded */
1940         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1941                 return;
1942
1943         /* Get the delegation credential for use by test/free_stateid */
1944         rcu_read_lock();
1945         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1946         if (delegation != NULL &&
1947             nfs4_stateid_match(&delegation->stateid, stateid)) {
1948                 cred = get_rpccred(delegation->cred);
1949                 rcu_read_unlock();
1950                 status = nfs41_test_stateid(server, stateid, cred);
1951         } else
1952                 rcu_read_unlock();
1953
1954         if (status != NFS_OK) {
1955                 /* Free the stateid unless the server explicitly
1956                  * informs us the stateid is unrecognized. */
1957                 if (status != -NFS4ERR_BAD_STATEID)
1958                         nfs41_free_stateid(server, stateid, cred);
1959                 nfs_remove_bad_delegation(state->inode);
1960
1961                 write_seqlock(&state->seqlock);
1962                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1963                 write_sequnlock(&state->seqlock);
1964                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1965         }
1966
1967         if (cred != NULL)
1968                 put_rpccred(cred);
1969 }
1970
1971 /**
1972  * nfs41_check_open_stateid - possibly free an open stateid
1973  *
1974  * @state: NFSv4 state for an inode
1975  *
1976  * Returns NFS_OK if recovery for this stateid is now finished.
1977  * Otherwise a negative NFS4ERR value is returned.
1978  */
1979 static int nfs41_check_open_stateid(struct nfs4_state *state)
1980 {
1981         struct nfs_server *server = NFS_SERVER(state->inode);
1982         nfs4_stateid *stateid = &state->open_stateid;
1983         struct rpc_cred *cred = state->owner->so_cred;
1984         int status;
1985
1986         /* If a state reset has been done, test_stateid is unneeded */
1987         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1988             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1989             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1990                 return -NFS4ERR_BAD_STATEID;
1991
1992         status = nfs41_test_stateid(server, stateid, cred);
1993         if (status != NFS_OK) {
1994                 /* Free the stateid unless the server explicitly
1995                  * informs us the stateid is unrecognized. */
1996                 if (status != -NFS4ERR_BAD_STATEID)
1997                         nfs41_free_stateid(server, stateid, cred);
1998
1999                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2000                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2001                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2002                 clear_bit(NFS_OPEN_STATE, &state->flags);
2003         }
2004         return status;
2005 }
2006
2007 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2008 {
2009         int status;
2010
2011         nfs41_clear_delegation_stateid(state);
2012         status = nfs41_check_open_stateid(state);
2013         if (status != NFS_OK)
2014                 status = nfs4_open_expired(sp, state);
2015         return status;
2016 }
2017 #endif
2018
2019 /*
2020  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2021  * fields corresponding to attributes that were used to store the verifier.
2022  * Make sure we clobber those fields in the later setattr call
2023  */
2024 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2025 {
2026         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2027             !(sattr->ia_valid & ATTR_ATIME_SET))
2028                 sattr->ia_valid |= ATTR_ATIME;
2029
2030         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2031             !(sattr->ia_valid & ATTR_MTIME_SET))
2032                 sattr->ia_valid |= ATTR_MTIME;
2033 }
2034
2035 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2036                 fmode_t fmode,
2037                 int flags,
2038                 struct nfs_open_context *ctx)
2039 {
2040         struct nfs4_state_owner *sp = opendata->owner;
2041         struct nfs_server *server = sp->so_server;
2042         struct dentry *dentry;
2043         struct nfs4_state *state;
2044         unsigned int seq;
2045         int ret;
2046
2047         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2048
2049         ret = _nfs4_proc_open(opendata);
2050         if (ret != 0)
2051                 goto out;
2052
2053         state = nfs4_opendata_to_nfs4_state(opendata);
2054         ret = PTR_ERR(state);
2055         if (IS_ERR(state))
2056                 goto out;
2057         if (server->caps & NFS_CAP_POSIX_LOCK)
2058                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2059
2060         dentry = opendata->dentry;
2061         if (dentry->d_inode == NULL) {
2062                 /* FIXME: Is this d_drop() ever needed? */
2063                 d_drop(dentry);
2064                 dentry = d_add_unique(dentry, igrab(state->inode));
2065                 if (dentry == NULL) {
2066                         dentry = opendata->dentry;
2067                 } else if (dentry != ctx->dentry) {
2068                         dput(ctx->dentry);
2069                         ctx->dentry = dget(dentry);
2070                 }
2071                 nfs_set_verifier(dentry,
2072                                 nfs_save_change_attribute(opendata->dir->d_inode));
2073         }
2074
2075         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2076         if (ret != 0)
2077                 goto out;
2078
2079         ctx->state = state;
2080         if (dentry->d_inode == state->inode) {
2081                 nfs_inode_attach_open_context(ctx);
2082                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2083                         nfs4_schedule_stateid_recovery(server, state);
2084         }
2085 out:
2086         return ret;
2087 }
2088
2089 /*
2090  * Returns a referenced nfs4_state
2091  */
2092 static int _nfs4_do_open(struct inode *dir,
2093                         struct nfs_open_context *ctx,
2094                         int flags,
2095                         struct iattr *sattr,
2096                         struct nfs4_label *label)
2097 {
2098         struct nfs4_state_owner  *sp;
2099         struct nfs4_state     *state = NULL;
2100         struct nfs_server       *server = NFS_SERVER(dir);
2101         struct nfs4_opendata *opendata;
2102         struct dentry *dentry = ctx->dentry;
2103         struct rpc_cred *cred = ctx->cred;
2104         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2105         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2106         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2107         struct nfs4_label *olabel = NULL;
2108         int status;
2109
2110         /* Protect against reboot recovery conflicts */
2111         status = -ENOMEM;
2112         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2113         if (sp == NULL) {
2114                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2115                 goto out_err;
2116         }
2117         status = nfs4_recover_expired_lease(server);
2118         if (status != 0)
2119                 goto err_put_state_owner;
2120         if (dentry->d_inode != NULL)
2121                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2122         status = -ENOMEM;
2123         if (dentry->d_inode)
2124                 claim = NFS4_OPEN_CLAIM_FH;
2125         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2126                         label, claim, GFP_KERNEL);
2127         if (opendata == NULL)
2128                 goto err_put_state_owner;
2129
2130         if (label) {
2131                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2132                 if (IS_ERR(olabel)) {
2133                         status = PTR_ERR(olabel);
2134                         goto err_opendata_put;
2135                 }
2136         }
2137
2138         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2139                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2140                 if (!opendata->f_attr.mdsthreshold)
2141                         goto err_free_label;
2142                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2143         }
2144         if (dentry->d_inode != NULL)
2145                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2146
2147         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2148         if (status != 0)
2149                 goto err_free_label;
2150         state = ctx->state;
2151
2152         if ((opendata->o_arg.open_flags & O_EXCL) &&
2153             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2154                 nfs4_exclusive_attrset(opendata, sattr);
2155
2156                 nfs_fattr_init(opendata->o_res.f_attr);
2157                 status = nfs4_do_setattr(state->inode, cred,
2158                                 opendata->o_res.f_attr, sattr,
2159                                 state, label, olabel);
2160                 if (status == 0) {
2161                         nfs_setattr_update_inode(state->inode, sattr);
2162                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2163                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2164                 }
2165         }
2166
2167         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2168                 *ctx_th = opendata->f_attr.mdsthreshold;
2169         else
2170                 kfree(opendata->f_attr.mdsthreshold);
2171         opendata->f_attr.mdsthreshold = NULL;
2172
2173         nfs4_label_free(olabel);
2174
2175         nfs4_opendata_put(opendata);
2176         nfs4_put_state_owner(sp);
2177         return 0;
2178 err_free_label:
2179         nfs4_label_free(olabel);
2180 err_opendata_put:
2181         kfree(opendata->f_attr.mdsthreshold);
2182         nfs4_opendata_put(opendata);
2183 err_put_state_owner:
2184         nfs4_put_state_owner(sp);
2185 out_err:
2186         return status;
2187 }
2188
2189
2190 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2191                                         struct nfs_open_context *ctx,
2192                                         int flags,
2193                                         struct iattr *sattr,
2194                                         struct nfs4_label *label)
2195 {
2196         struct nfs_server *server = NFS_SERVER(dir);
2197         struct nfs4_exception exception = { };
2198         struct nfs4_state *res;
2199         int status;
2200
2201         do {
2202                 status = _nfs4_do_open(dir, ctx, flags, sattr, label);
2203                 res = ctx->state;
2204                 trace_nfs4_open_file(ctx, flags, status);
2205                 if (status == 0)
2206                         break;
2207                 /* NOTE: BAD_SEQID means the server and client disagree about the
2208                  * book-keeping w.r.t. state-changing operations
2209                  * (OPEN/CLOSE/LOCK/LOCKU...)
2210                  * It is actually a sign of a bug on the client or on the server.
2211                  *
2212                  * If we receive a BAD_SEQID error in the particular case of
2213                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2214                  * have unhashed the old state_owner for us, and that we can
2215                  * therefore safely retry using a new one. We should still warn
2216                  * the user though...
2217                  */
2218                 if (status == -NFS4ERR_BAD_SEQID) {
2219                         pr_warn_ratelimited("NFS: v4 server %s "
2220                                         " returned a bad sequence-id error!\n",
2221                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2222                         exception.retry = 1;
2223                         continue;
2224                 }
2225                 /*
2226                  * BAD_STATEID on OPEN means that the server cancelled our
2227                  * state before it received the OPEN_CONFIRM.
2228                  * Recover by retrying the request as per the discussion
2229                  * on Page 181 of RFC3530.
2230                  */
2231                 if (status == -NFS4ERR_BAD_STATEID) {
2232                         exception.retry = 1;
2233                         continue;
2234                 }
2235                 if (status == -EAGAIN) {
2236                         /* We must have found a delegation */
2237                         exception.retry = 1;
2238                         continue;
2239                 }
2240                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2241                         continue;
2242                 res = ERR_PTR(nfs4_handle_exception(server,
2243                                         status, &exception));
2244         } while (exception.retry);
2245         return res;
2246 }
2247
2248 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2249                             struct nfs_fattr *fattr, struct iattr *sattr,
2250                             struct nfs4_state *state, struct nfs4_label *ilabel,
2251                             struct nfs4_label *olabel)
2252 {
2253         struct nfs_server *server = NFS_SERVER(inode);
2254         struct nfs_setattrargs  arg = {
2255                 .fh             = NFS_FH(inode),
2256                 .iap            = sattr,
2257                 .server         = server,
2258                 .bitmask = server->attr_bitmask,
2259                 .label          = ilabel,
2260         };
2261         struct nfs_setattrres  res = {
2262                 .fattr          = fattr,
2263                 .label          = olabel,
2264                 .server         = server,
2265         };
2266         struct rpc_message msg = {
2267                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2268                 .rpc_argp       = &arg,
2269                 .rpc_resp       = &res,
2270                 .rpc_cred       = cred,
2271         };
2272         unsigned long timestamp = jiffies;
2273         fmode_t fmode;
2274         bool truncate;
2275         int status;
2276
2277         arg.bitmask = nfs4_bitmask(server, ilabel);
2278         if (ilabel)
2279                 arg.bitmask = nfs4_bitmask(server, olabel);
2280
2281         nfs_fattr_init(fattr);
2282
2283         /* Servers should only apply open mode checks for file size changes */
2284         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2285         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2286
2287         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2288                 /* Use that stateid */
2289         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2290                 struct nfs_lockowner lockowner = {
2291                         .l_owner = current->files,
2292                         .l_pid = current->tgid,
2293                 };
2294                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2295                                 &lockowner);
2296         } else
2297                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2298
2299         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2300         if (status == 0 && state != NULL)
2301                 renew_lease(server, timestamp);
2302         return status;
2303 }
2304
2305 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2306                            struct nfs_fattr *fattr, struct iattr *sattr,
2307                            struct nfs4_state *state, struct nfs4_label *ilabel,
2308                            struct nfs4_label *olabel)
2309 {
2310         struct nfs_server *server = NFS_SERVER(inode);
2311         struct nfs4_exception exception = {
2312                 .state = state,
2313                 .inode = inode,
2314         };
2315         int err;
2316         do {
2317                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2318                 trace_nfs4_setattr(inode, err);
2319                 switch (err) {
2320                 case -NFS4ERR_OPENMODE:
2321                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2322                                 pr_warn_once("NFSv4: server %s is incorrectly "
2323                                                 "applying open mode checks to "
2324                                                 "a SETATTR that is not "
2325                                                 "changing file size.\n",
2326                                                 server->nfs_client->cl_hostname);
2327                         }
2328                         if (state && !(state->state & FMODE_WRITE)) {
2329                                 err = -EBADF;
2330                                 if (sattr->ia_valid & ATTR_OPEN)
2331                                         err = -EACCES;
2332                                 goto out;
2333                         }
2334                 }
2335                 err = nfs4_handle_exception(server, err, &exception);
2336         } while (exception.retry);
2337 out:
2338         return err;
2339 }
2340
2341 struct nfs4_closedata {
2342         struct inode *inode;
2343         struct nfs4_state *state;
2344         struct nfs_closeargs arg;
2345         struct nfs_closeres res;
2346         struct nfs_fattr fattr;
2347         unsigned long timestamp;
2348         bool roc;
2349         u32 roc_barrier;
2350 };
2351
2352 static void nfs4_free_closedata(void *data)
2353 {
2354         struct nfs4_closedata *calldata = data;
2355         struct nfs4_state_owner *sp = calldata->state->owner;
2356         struct super_block *sb = calldata->state->inode->i_sb;
2357
2358         if (calldata->roc)
2359                 pnfs_roc_release(calldata->state->inode);
2360         nfs4_put_open_state(calldata->state);
2361         nfs_free_seqid(calldata->arg.seqid);
2362         nfs4_put_state_owner(sp);
2363         nfs_sb_deactive(sb);
2364         kfree(calldata);
2365 }
2366
2367 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2368                 fmode_t fmode)
2369 {
2370         spin_lock(&state->owner->so_lock);
2371         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2372         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2373         case FMODE_WRITE:
2374                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2375                 break;
2376         case FMODE_READ:
2377                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2378                 break;
2379         case 0:
2380                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2381                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2382                 clear_bit(NFS_OPEN_STATE, &state->flags);
2383         }
2384         spin_unlock(&state->owner->so_lock);
2385 }
2386
2387 static void nfs4_close_done(struct rpc_task *task, void *data)
2388 {
2389         struct nfs4_closedata *calldata = data;
2390         struct nfs4_state *state = calldata->state;
2391         struct nfs_server *server = NFS_SERVER(calldata->inode);
2392
2393         dprintk("%s: begin!\n", __func__);
2394         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2395                 return;
2396         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2397         /* hmm. we are done with the inode, and in the process of freeing
2398          * the state_owner. we keep this around to process errors
2399          */
2400         switch (task->tk_status) {
2401                 case 0:
2402                         if (calldata->roc)
2403                                 pnfs_roc_set_barrier(state->inode,
2404                                                      calldata->roc_barrier);
2405                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2406                         renew_lease(server, calldata->timestamp);
2407                         nfs4_close_clear_stateid_flags(state,
2408                                         calldata->arg.fmode);
2409                         break;
2410                 case -NFS4ERR_STALE_STATEID:
2411                 case -NFS4ERR_OLD_STATEID:
2412                 case -NFS4ERR_BAD_STATEID:
2413                 case -NFS4ERR_EXPIRED:
2414                         if (calldata->arg.fmode == 0)
2415                                 break;
2416                 default:
2417                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2418                                 rpc_restart_call_prepare(task);
2419         }
2420         nfs_release_seqid(calldata->arg.seqid);
2421         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2422         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2423 }
2424
2425 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2426 {
2427         struct nfs4_closedata *calldata = data;
2428         struct nfs4_state *state = calldata->state;
2429         struct inode *inode = calldata->inode;
2430         int call_close = 0;
2431
2432         dprintk("%s: begin!\n", __func__);
2433         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2434                 goto out_wait;
2435
2436         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2437         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2438         spin_lock(&state->owner->so_lock);
2439         /* Calculate the change in open mode */
2440         if (state->n_rdwr == 0) {
2441                 if (state->n_rdonly == 0) {
2442                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2443                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2444                         calldata->arg.fmode &= ~FMODE_READ;
2445                 }
2446                 if (state->n_wronly == 0) {
2447                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2448                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2449                         calldata->arg.fmode &= ~FMODE_WRITE;
2450                 }
2451         }
2452         if (!nfs4_valid_open_stateid(state))
2453                 call_close = 0;
2454         spin_unlock(&state->owner->so_lock);
2455
2456         if (!call_close) {
2457                 /* Note: exit _without_ calling nfs4_close_done */
2458                 goto out_no_action;
2459         }
2460
2461         if (calldata->arg.fmode == 0) {
2462                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2463                 if (calldata->roc &&
2464                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2465                         nfs_release_seqid(calldata->arg.seqid);
2466                         goto out_wait;
2467                     }
2468         }
2469
2470         nfs_fattr_init(calldata->res.fattr);
2471         calldata->timestamp = jiffies;
2472         if (nfs4_setup_sequence(NFS_SERVER(inode),
2473                                 &calldata->arg.seq_args,
2474                                 &calldata->res.seq_res,
2475                                 task) != 0)
2476                 nfs_release_seqid(calldata->arg.seqid);
2477         dprintk("%s: done!\n", __func__);
2478         return;
2479 out_no_action:
2480         task->tk_action = NULL;
2481 out_wait:
2482         nfs4_sequence_done(task, &calldata->res.seq_res);
2483 }
2484
2485 static const struct rpc_call_ops nfs4_close_ops = {
2486         .rpc_call_prepare = nfs4_close_prepare,
2487         .rpc_call_done = nfs4_close_done,
2488         .rpc_release = nfs4_free_closedata,
2489 };
2490
2491 /*
2492  * It is possible for data to be read/written from a mem-mapped file
2493  * after the sys_close call (which hits the vfs layer as a flush).
2494  * This means that we can't safely call nfsv4 close on a file until
2495  * the inode is cleared. This in turn means that we are not good
2496  * NFSv4 citizens - we do not indicate to the server to update the file's
2497  * share state even when we are done with one of the three share
2498  * stateid's in the inode.
2499  *
2500  * NOTE: Caller must be holding the sp->so_owner semaphore!
2501  */
2502 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2503 {
2504         struct nfs_server *server = NFS_SERVER(state->inode);
2505         struct nfs4_closedata *calldata;
2506         struct nfs4_state_owner *sp = state->owner;
2507         struct rpc_task *task;
2508         struct rpc_message msg = {
2509                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2510                 .rpc_cred = state->owner->so_cred,
2511         };
2512         struct rpc_task_setup task_setup_data = {
2513                 .rpc_client = server->client,
2514                 .rpc_message = &msg,
2515                 .callback_ops = &nfs4_close_ops,
2516                 .workqueue = nfsiod_workqueue,
2517                 .flags = RPC_TASK_ASYNC,
2518         };
2519         int status = -ENOMEM;
2520
2521         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2522         if (calldata == NULL)
2523                 goto out;
2524         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2525         calldata->inode = state->inode;
2526         calldata->state = state;
2527         calldata->arg.fh = NFS_FH(state->inode);
2528         calldata->arg.stateid = &state->open_stateid;
2529         /* Serialization for the sequence id */
2530         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2531         if (calldata->arg.seqid == NULL)
2532                 goto out_free_calldata;
2533         calldata->arg.fmode = 0;
2534         calldata->arg.bitmask = server->cache_consistency_bitmask;
2535         calldata->res.fattr = &calldata->fattr;
2536         calldata->res.seqid = calldata->arg.seqid;
2537         calldata->res.server = server;
2538         calldata->roc = pnfs_roc(state->inode);
2539         nfs_sb_active(calldata->inode->i_sb);
2540
2541         msg.rpc_argp = &calldata->arg;
2542         msg.rpc_resp = &calldata->res;
2543         task_setup_data.callback_data = calldata;
2544         task = rpc_run_task(&task_setup_data);
2545         if (IS_ERR(task))
2546                 return PTR_ERR(task);
2547         status = 0;
2548         if (wait)
2549                 status = rpc_wait_for_completion_task(task);
2550         rpc_put_task(task);
2551         return status;
2552 out_free_calldata:
2553         kfree(calldata);
2554 out:
2555         nfs4_put_open_state(state);
2556         nfs4_put_state_owner(sp);
2557         return status;
2558 }
2559
2560 static struct inode *
2561 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2562 {
2563         struct nfs4_state *state;
2564         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2565
2566         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2567
2568         /* Protect against concurrent sillydeletes */
2569         state = nfs4_do_open(dir, ctx, open_flags, attr, label);
2570
2571         nfs4_label_release_security(label);
2572
2573         if (IS_ERR(state))
2574                 return ERR_CAST(state);
2575         return state->inode;
2576 }
2577
2578 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2579 {
2580         if (ctx->state == NULL)
2581                 return;
2582         if (is_sync)
2583                 nfs4_close_sync(ctx->state, ctx->mode);
2584         else
2585                 nfs4_close_state(ctx->state, ctx->mode);
2586 }
2587
2588 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2589 {
2590         struct nfs4_server_caps_arg args = {
2591                 .fhandle = fhandle,
2592         };
2593         struct nfs4_server_caps_res res = {};
2594         struct rpc_message msg = {
2595                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2596                 .rpc_argp = &args,
2597                 .rpc_resp = &res,
2598         };
2599         int status;
2600
2601         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2602         if (status == 0) {
2603                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2604                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2605                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2606                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2607                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2608                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2609                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2610                         server->caps |= NFS_CAP_ACLS;
2611                 if (res.has_links != 0)
2612                         server->caps |= NFS_CAP_HARDLINKS;
2613                 if (res.has_symlinks != 0)
2614                         server->caps |= NFS_CAP_SYMLINKS;
2615                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2616                         server->caps |= NFS_CAP_FILEID;
2617                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2618                         server->caps |= NFS_CAP_MODE;
2619                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2620                         server->caps |= NFS_CAP_NLINK;
2621                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2622                         server->caps |= NFS_CAP_OWNER;
2623                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2624                         server->caps |= NFS_CAP_OWNER_GROUP;
2625                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2626                         server->caps |= NFS_CAP_ATIME;
2627                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2628                         server->caps |= NFS_CAP_CTIME;
2629                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2630                         server->caps |= NFS_CAP_MTIME;
2631 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2632                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2633                         server->caps |= NFS_CAP_SECURITY_LABEL;
2634 #endif
2635                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2636                                 sizeof(server->attr_bitmask));
2637
2638                 if (server->caps & NFS_CAP_SECURITY_LABEL) {
2639                         server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2640                         res.attr_bitmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2641                 }
2642                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2643                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2644                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2645                 server->acl_bitmask = res.acl_bitmask;
2646                 server->fh_expire_type = res.fh_expire_type;
2647         }
2648
2649         return status;
2650 }
2651
2652 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2653 {
2654         struct nfs4_exception exception = { };
2655         int err;
2656         do {
2657                 err = nfs4_handle_exception(server,
2658                                 _nfs4_server_capabilities(server, fhandle),
2659                                 &exception);
2660         } while (exception.retry);
2661         return err;
2662 }
2663
2664 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2665                 struct nfs_fsinfo *info)
2666 {
2667         u32 bitmask[3];
2668         struct nfs4_lookup_root_arg args = {
2669                 .bitmask = bitmask,
2670         };
2671         struct nfs4_lookup_res res = {
2672                 .server = server,
2673                 .fattr = info->fattr,
2674                 .fh = fhandle,
2675         };
2676         struct rpc_message msg = {
2677                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2678                 .rpc_argp = &args,
2679                 .rpc_resp = &res,
2680         };
2681
2682         bitmask[0] = nfs4_fattr_bitmap[0];
2683         bitmask[1] = nfs4_fattr_bitmap[1];
2684         /*
2685          * Process the label in the upcoming getfattr
2686          */
2687         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2688
2689         nfs_fattr_init(info->fattr);
2690         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2691 }
2692
2693 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2694                 struct nfs_fsinfo *info)
2695 {
2696         struct nfs4_exception exception = { };
2697         int err;
2698         do {
2699                 err = _nfs4_lookup_root(server, fhandle, info);
2700                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2701                 switch (err) {
2702                 case 0:
2703                 case -NFS4ERR_WRONGSEC:
2704                         goto out;
2705                 default:
2706                         err = nfs4_handle_exception(server, err, &exception);
2707                 }
2708         } while (exception.retry);
2709 out:
2710         return err;
2711 }
2712
2713 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2714                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2715 {
2716         struct rpc_auth *auth;
2717         int ret;
2718
2719         auth = rpcauth_create(flavor, server->client);
2720         if (IS_ERR(auth)) {
2721                 ret = -EACCES;
2722                 goto out;
2723         }
2724         ret = nfs4_lookup_root(server, fhandle, info);
2725 out:
2726         return ret;
2727 }
2728
2729 /*
2730  * Retry pseudoroot lookup with various security flavors.  We do this when:
2731  *
2732  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2733  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2734  *
2735  * Returns zero on success, or a negative NFS4ERR value, or a
2736  * negative errno value.
2737  */
2738 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2739                               struct nfs_fsinfo *info)
2740 {
2741         /* Per 3530bis 15.33.5 */
2742         static const rpc_authflavor_t flav_array[] = {
2743                 RPC_AUTH_GSS_KRB5P,
2744                 RPC_AUTH_GSS_KRB5I,
2745                 RPC_AUTH_GSS_KRB5,
2746                 RPC_AUTH_UNIX,                  /* courtesy */
2747                 RPC_AUTH_NULL,
2748         };
2749         int status = -EPERM;
2750         size_t i;
2751
2752         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2753                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2754                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2755                         continue;
2756                 break;
2757         }
2758
2759         /*
2760          * -EACCESS could mean that the user doesn't have correct permissions
2761          * to access the mount.  It could also mean that we tried to mount
2762          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2763          * existing mount programs don't handle -EACCES very well so it should
2764          * be mapped to -EPERM instead.
2765          */
2766         if (status == -EACCES)
2767                 status = -EPERM;
2768         return status;
2769 }
2770
2771 static int nfs4_do_find_root_sec(struct nfs_server *server,
2772                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2773 {
2774         int mv = server->nfs_client->cl_minorversion;
2775         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2776 }
2777
2778 /**
2779  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2780  * @server: initialized nfs_server handle
2781  * @fhandle: we fill in the pseudo-fs root file handle
2782  * @info: we fill in an FSINFO struct
2783  *
2784  * Returns zero on success, or a negative errno.
2785  */
2786 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2787                          struct nfs_fsinfo *info)
2788 {
2789         int status;
2790
2791         status = nfs4_lookup_root(server, fhandle, info);
2792         if ((status == -NFS4ERR_WRONGSEC) &&
2793             !(server->flags & NFS_MOUNT_SECFLAVOUR))
2794                 status = nfs4_do_find_root_sec(server, fhandle, info);
2795
2796         if (status == 0)
2797                 status = nfs4_server_capabilities(server, fhandle);
2798         if (status == 0)
2799                 status = nfs4_do_fsinfo(server, fhandle, info);
2800
2801         return nfs4_map_errors(status);
2802 }
2803
2804 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2805                               struct nfs_fsinfo *info)
2806 {
2807         int error;
2808         struct nfs_fattr *fattr = info->fattr;
2809         struct nfs4_label *label = NULL;
2810
2811         error = nfs4_server_capabilities(server, mntfh);
2812         if (error < 0) {
2813                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2814                 return error;
2815         }
2816
2817         label = nfs4_label_alloc(server, GFP_KERNEL);
2818         if (IS_ERR(label))
2819                 return PTR_ERR(label);
2820
2821         error = nfs4_proc_getattr(server, mntfh, fattr, label);
2822         if (error < 0) {
2823                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2824                 goto err_free_label;
2825         }
2826
2827         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2828             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2829                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2830
2831 err_free_label:
2832         nfs4_label_free(label);
2833
2834         return error;
2835 }
2836
2837 /*
2838  * Get locations and (maybe) other attributes of a referral.
2839  * Note that we'll actually follow the referral later when
2840  * we detect fsid mismatch in inode revalidation
2841  */
2842 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2843                              const struct qstr *name, struct nfs_fattr *fattr,
2844                              struct nfs_fh *fhandle)
2845 {
2846         int status = -ENOMEM;
2847         struct page *page = NULL;
2848         struct nfs4_fs_locations *locations = NULL;
2849
2850         page = alloc_page(GFP_KERNEL);
2851         if (page == NULL)
2852                 goto out;
2853         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2854         if (locations == NULL)
2855                 goto out;
2856
2857         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2858         if (status != 0)
2859                 goto out;
2860         /* Make sure server returned a different fsid for the referral */
2861         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2862                 dprintk("%s: server did not return a different fsid for"
2863                         " a referral at %s\n", __func__, name->name);
2864                 status = -EIO;
2865                 goto out;
2866         }
2867         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2868         nfs_fixup_referral_attributes(&locations->fattr);
2869
2870         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2871         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2872         memset(fhandle, 0, sizeof(struct nfs_fh));
2873 out:
2874         if (page)
2875                 __free_page(page);
2876         kfree(locations);
2877         return status;
2878 }
2879
2880 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
2881                                 struct nfs_fattr *fattr, struct nfs4_label *label)
2882 {
2883         struct nfs4_getattr_arg args = {
2884                 .fh = fhandle,
2885                 .bitmask = server->attr_bitmask,
2886         };
2887         struct nfs4_getattr_res res = {
2888                 .fattr = fattr,
2889                 .label = label,
2890                 .server = server,
2891         };
2892         struct rpc_message msg = {
2893                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2894                 .rpc_argp = &args,
2895                 .rpc_resp = &res,
2896         };
2897
2898         args.bitmask = nfs4_bitmask(server, label);
2899
2900         nfs_fattr_init(fattr);
2901         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2902 }
2903
2904 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
2905                                 struct nfs_fattr *fattr, struct nfs4_label *label)
2906 {
2907         struct nfs4_exception exception = { };
2908         int err;
2909         do {
2910                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
2911                 trace_nfs4_getattr(server, fhandle, fattr, err);
2912                 err = nfs4_handle_exception(server, err,
2913                                 &exception);
2914         } while (exception.retry);
2915         return err;
2916 }
2917
2918 /*
2919  * The file is not closed if it is opened due to the a request to change
2920  * the size of the file. The open call will not be needed once the
2921  * VFS layer lookup-intents are implemented.
2922  *
2923  * Close is called when the inode is destroyed.
2924  * If we haven't opened the file for O_WRONLY, we
2925  * need to in the size_change case to obtain a stateid.
2926  *
2927  * Got race?
2928  * Because OPEN is always done by name in nfsv4, it is
2929  * possible that we opened a different file by the same
2930  * name.  We can recognize this race condition, but we
2931  * can't do anything about it besides returning an error.
2932  *
2933  * This will be fixed with VFS changes (lookup-intent).
2934  */
2935 static int
2936 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2937                   struct iattr *sattr)
2938 {
2939         struct inode *inode = dentry->d_inode;
2940         struct rpc_cred *cred = NULL;
2941         struct nfs4_state *state = NULL;
2942         struct nfs4_label *label = NULL;
2943         int status;
2944
2945         if (pnfs_ld_layoutret_on_setattr(inode))
2946                 pnfs_commit_and_return_layout(inode);
2947
2948         nfs_fattr_init(fattr);
2949
2950         /* Deal with open(O_TRUNC) */
2951         if (sattr->ia_valid & ATTR_OPEN)
2952                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
2953
2954         /* Optimization: if the end result is no change, don't RPC */
2955         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
2956                 return 0;
2957
2958         /* Search for an existing open(O_WRITE) file */
2959         if (sattr->ia_valid & ATTR_FILE) {
2960                 struct nfs_open_context *ctx;
2961
2962                 ctx = nfs_file_open_context(sattr->ia_file);
2963                 if (ctx) {
2964                         cred = ctx->cred;
2965                         state = ctx->state;
2966                 }
2967         }
2968
2969         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
2970         if (IS_ERR(label))
2971                 return PTR_ERR(label);
2972
2973         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
2974         if (status == 0) {
2975                 nfs_setattr_update_inode(inode, sattr);
2976                 nfs_setsecurity(inode, fattr, label);
2977         }
2978         nfs4_label_free(label);
2979         return status;
2980 }
2981
2982 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2983                 const struct qstr *name, struct nfs_fh *fhandle,
2984                 struct nfs_fattr *fattr, struct nfs4_label *label)
2985 {
2986         struct nfs_server *server = NFS_SERVER(dir);
2987         int                    status;
2988         struct nfs4_lookup_arg args = {
2989                 .bitmask = server->attr_bitmask,
2990                 .dir_fh = NFS_FH(dir),
2991                 .name = name,
2992         };
2993         struct nfs4_lookup_res res = {
2994                 .server = server,
2995                 .fattr = fattr,
2996                 .label = label,
2997                 .fh = fhandle,
2998         };
2999         struct rpc_message msg = {
3000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3001                 .rpc_argp = &args,
3002                 .rpc_resp = &res,
3003         };
3004
3005         args.bitmask = nfs4_bitmask(server, label);
3006
3007         nfs_fattr_init(fattr);
3008
3009         dprintk("NFS call  lookup %s\n", name->name);
3010         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3011         dprintk("NFS reply lookup: %d\n", status);
3012         return status;
3013 }
3014
3015 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3016 {
3017         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3018                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3019         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3020         fattr->nlink = 2;
3021 }
3022
3023 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3024                                    struct qstr *name, struct nfs_fh *fhandle,
3025                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3026 {
3027         struct nfs4_exception exception = { };
3028         struct rpc_clnt *client = *clnt;
3029         int err;
3030         do {
3031                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3032                 trace_nfs4_lookup(dir, name, err);
3033                 switch (err) {
3034                 case -NFS4ERR_BADNAME:
3035                         err = -ENOENT;
3036                         goto out;
3037                 case -NFS4ERR_MOVED:
3038                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3039                         goto out;
3040                 case -NFS4ERR_WRONGSEC:
3041                         err = -EPERM;
3042                         if (client != *clnt)
3043                                 goto out;
3044
3045                         client = nfs4_create_sec_client(client, dir, name);
3046                         if (IS_ERR(client))
3047                                 return PTR_ERR(client);
3048
3049                         exception.retry = 1;
3050                         break;
3051                 default:
3052                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3053                 }
3054         } while (exception.retry);
3055
3056 out:
3057         if (err == 0)
3058                 *clnt = client;
3059         else if (client != *clnt)
3060                 rpc_shutdown_client(client);
3061
3062         return err;
3063 }
3064
3065 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3066                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3067                             struct nfs4_label *label)
3068 {
3069         int status;
3070         struct rpc_clnt *client = NFS_CLIENT(dir);
3071
3072         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3073         if (client != NFS_CLIENT(dir)) {
3074                 rpc_shutdown_client(client);
3075                 nfs_fixup_secinfo_attributes(fattr);
3076         }
3077         return status;
3078 }
3079
3080 struct rpc_clnt *
3081 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3082                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3083 {
3084         int status;
3085         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
3086
3087         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3088         if (status < 0) {
3089                 rpc_shutdown_client(client);
3090                 return ERR_PTR(status);
3091         }
3092         return client;
3093 }
3094
3095 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3096 {
3097         struct nfs_server *server = NFS_SERVER(inode);
3098         struct nfs4_accessargs args = {
3099                 .fh = NFS_FH(inode),
3100                 .bitmask = server->cache_consistency_bitmask,
3101         };
3102         struct nfs4_accessres res = {
3103                 .server = server,
3104         };
3105         struct rpc_message msg = {
3106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3107                 .rpc_argp = &args,
3108                 .rpc_resp = &res,
3109                 .rpc_cred = entry->cred,
3110         };
3111         int mode = entry->mask;
3112         int status = 0;
3113
3114         /*
3115          * Determine which access bits we want to ask for...
3116          */
3117         if (mode & MAY_READ)
3118                 args.access |= NFS4_ACCESS_READ;
3119         if (S_ISDIR(inode->i_mode)) {
3120                 if (mode & MAY_WRITE)
3121                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3122                 if (mode & MAY_EXEC)
3123                         args.access |= NFS4_ACCESS_LOOKUP;
3124         } else {
3125                 if (mode & MAY_WRITE)
3126                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3127                 if (mode & MAY_EXEC)
3128                         args.access |= NFS4_ACCESS_EXECUTE;
3129         }
3130
3131         res.fattr = nfs_alloc_fattr();
3132         if (res.fattr == NULL)
3133                 return -ENOMEM;
3134
3135         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3136         if (!status) {
3137                 nfs_access_set_mask(entry, res.access);
3138                 nfs_refresh_inode(inode, res.fattr);
3139         }
3140         nfs_free_fattr(res.fattr);
3141         return status;
3142 }
3143
3144 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3145 {
3146         struct nfs4_exception exception = { };
3147         int err;
3148         do {
3149                 err = _nfs4_proc_access(inode, entry);
3150                 trace_nfs4_access(inode, err);
3151                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3152                                 &exception);
3153         } while (exception.retry);
3154         return err;
3155 }
3156
3157 /*
3158  * TODO: For the time being, we don't try to get any attributes
3159  * along with any of the zero-copy operations READ, READDIR,
3160  * READLINK, WRITE.
3161  *
3162  * In the case of the first three, we want to put the GETATTR
3163  * after the read-type operation -- this is because it is hard
3164  * to predict the length of a GETATTR response in v4, and thus
3165  * align the READ data correctly.  This means that the GETATTR
3166  * may end up partially falling into the page cache, and we should
3167  * shift it into the 'tail' of the xdr_buf before processing.
3168  * To do this efficiently, we need to know the total length
3169  * of data received, which doesn't seem to be available outside
3170  * of the RPC layer.
3171  *
3172  * In the case of WRITE, we also want to put the GETATTR after
3173  * the operation -- in this case because we want to make sure
3174  * we get the post-operation mtime and size.
3175  *
3176  * Both of these changes to the XDR layer would in fact be quite
3177  * minor, but I decided to leave them for a subsequent patch.
3178  */
3179 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3180                 unsigned int pgbase, unsigned int pglen)
3181 {
3182         struct nfs4_readlink args = {
3183                 .fh       = NFS_FH(inode),
3184                 .pgbase   = pgbase,
3185                 .pglen    = pglen,
3186                 .pages    = &page,
3187         };
3188         struct nfs4_readlink_res res;
3189         struct rpc_message msg = {
3190                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3191                 .rpc_argp = &args,
3192                 .rpc_resp = &res,
3193         };
3194
3195         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3196 }
3197
3198 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3199                 unsigned int pgbase, unsigned int pglen)
3200 {
3201         struct nfs4_exception exception = { };
3202         int err;
3203         do {
3204                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3205                 trace_nfs4_readlink(inode, err);
3206                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3207                                 &exception);
3208         } while (exception.retry);
3209         return err;
3210 }
3211
3212 /*
3213  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3214  */
3215 static int
3216 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3217                  int flags)
3218 {
3219         struct nfs4_label l, *ilabel = NULL;
3220         struct nfs_open_context *ctx;
3221         struct nfs4_state *state;
3222         int status = 0;
3223
3224         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3225         if (IS_ERR(ctx))
3226                 return PTR_ERR(ctx);
3227
3228         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3229
3230         sattr->ia_mode &= ~current_umask();
3231         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel);
3232         if (IS_ERR(state)) {
3233                 status = PTR_ERR(state);
3234                 goto out;
3235         }
3236 out:
3237         nfs4_label_release_security(ilabel);
3238         put_nfs_open_context(ctx);
3239         return status;
3240 }
3241
3242 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3243 {
3244         struct nfs_server *server = NFS_SERVER(dir);
3245         struct nfs_removeargs args = {
3246                 .fh = NFS_FH(dir),
3247                 .name = *name,
3248         };
3249         struct nfs_removeres res = {
3250                 .server = server,
3251         };
3252         struct rpc_message msg = {
3253                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3254                 .rpc_argp = &args,
3255                 .rpc_resp = &res,
3256         };
3257         int status;
3258
3259         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3260         if (status == 0)
3261                 update_changeattr(dir, &res.cinfo);
3262         return status;
3263 }
3264
3265 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3266 {
3267         struct nfs4_exception exception = { };
3268         int err;
3269         do {
3270                 err = _nfs4_proc_remove(dir, name);
3271                 trace_nfs4_remove(dir, name, err);
3272                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3273                                 &exception);
3274         } while (exception.retry);
3275         return err;
3276 }
3277
3278 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3279 {
3280         struct nfs_server *server = NFS_SERVER(dir);
3281         struct nfs_removeargs *args = msg->rpc_argp;
3282         struct nfs_removeres *res = msg->rpc_resp;
3283
3284         res->server = server;
3285         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3286         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3287
3288         nfs_fattr_init(res->dir_attr);
3289 }
3290
3291 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3292 {
3293         nfs4_setup_sequence(NFS_SERVER(data->dir),
3294                         &data->args.seq_args,
3295                         &data->res.seq_res,
3296                         task);
3297 }
3298
3299 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3300 {
3301         struct nfs_unlinkdata *data = task->tk_calldata;
3302         struct nfs_removeres *res = &data->res;
3303
3304         if (!nfs4_sequence_done(task, &res->seq_res))
3305                 return 0;
3306         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3307                 return 0;
3308         update_changeattr(dir, &res->cinfo);
3309         return 1;
3310 }
3311
3312 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3313 {
3314         struct nfs_server *server = NFS_SERVER(dir);
3315         struct nfs_renameargs *arg = msg->rpc_argp;
3316         struct nfs_renameres *res = msg->rpc_resp;
3317
3318         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3319         res->server = server;
3320         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3321 }
3322
3323 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3324 {
3325         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3326                         &data->args.seq_args,
3327                         &data->res.seq_res,
3328                         task);
3329 }
3330
3331 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3332                                  struct inode *new_dir)
3333 {
3334         struct nfs_renamedata *data = task->tk_calldata;
3335         struct nfs_renameres *res = &data->res;
3336
3337         if (!nfs4_sequence_done(task, &res->seq_res))
3338                 return 0;
3339         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3340                 return 0;
3341
3342         update_changeattr(old_dir, &res->old_cinfo);
3343         update_changeattr(new_dir, &res->new_cinfo);
3344         return 1;
3345 }
3346
3347 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3348                 struct inode *new_dir, struct qstr *new_name)
3349 {
3350         struct nfs_server *server = NFS_SERVER(old_dir);
3351         struct nfs_renameargs arg = {
3352                 .old_dir = NFS_FH(old_dir),
3353                 .new_dir = NFS_FH(new_dir),
3354                 .old_name = old_name,
3355                 .new_name = new_name,
3356         };
3357         struct nfs_renameres res = {
3358                 .server = server,
3359         };
3360         struct rpc_message msg = {
3361                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3362                 .rpc_argp = &arg,
3363                 .rpc_resp = &res,
3364         };
3365         int status = -ENOMEM;
3366
3367         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3368         if (!status) {
3369                 update_changeattr(old_dir, &res.old_cinfo);
3370                 update_changeattr(new_dir, &res.new_cinfo);
3371         }
3372         return status;
3373 }
3374
3375 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3376                 struct inode *new_dir, struct qstr *new_name)
3377 {
3378         struct nfs4_exception exception = { };
3379         int err;
3380         do {
3381                 err = _nfs4_proc_rename(old_dir, old_name,
3382                                         new_dir, new_name);
3383                 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3384                 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3385                                 &exception);
3386         } while (exception.retry);
3387         return err;
3388 }
3389
3390 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3391 {
3392         struct nfs_server *server = NFS_SERVER(inode);
3393         struct nfs4_link_arg arg = {
3394                 .fh     = NFS_FH(inode),
3395                 .dir_fh = NFS_FH(dir),
3396                 .name   = name,
3397                 .bitmask = server->attr_bitmask,
3398         };
3399         struct nfs4_link_res res = {
3400                 .server = server,
3401                 .label = NULL,
3402         };
3403         struct rpc_message msg = {
3404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3405                 .rpc_argp = &arg,
3406                 .rpc_resp = &res,
3407         };
3408         int status = -ENOMEM;
3409
3410         res.fattr = nfs_alloc_fattr();
3411         if (res.fattr == NULL)
3412                 goto out;
3413
3414         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3415         if (IS_ERR(res.label)) {
3416                 status = PTR_ERR(res.label);
3417                 goto out;
3418         }
3419         arg.bitmask = nfs4_bitmask(server, res.label);
3420
3421         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3422         if (!status) {
3423                 update_changeattr(dir, &res.cinfo);
3424                 status = nfs_post_op_update_inode(inode, res.fattr);
3425                 if (!status)
3426                         nfs_setsecurity(inode, res.fattr, res.label);
3427         }
3428
3429
3430         nfs4_label_free(res.label);
3431
3432 out:
3433         nfs_free_fattr(res.fattr);
3434         return status;
3435 }
3436
3437 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3438 {
3439         struct nfs4_exception exception = { };
3440         int err;
3441         do {
3442                 err = nfs4_handle_exception(NFS_SERVER(inode),
3443                                 _nfs4_proc_link(inode, dir, name),
3444                                 &exception);
3445         } while (exception.retry);
3446         return err;
3447 }
3448
3449 struct nfs4_createdata {
3450         struct rpc_message msg;
3451         struct nfs4_create_arg arg;
3452         struct nfs4_create_res res;
3453         struct nfs_fh fh;
3454         struct nfs_fattr fattr;
3455         struct nfs4_label *label;
3456 };
3457
3458 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3459                 struct qstr *name, struct iattr *sattr, u32 ftype)
3460 {
3461         struct nfs4_createdata *data;
3462
3463         data = kzalloc(sizeof(*data), GFP_KERNEL);
3464         if (data != NULL) {
3465                 struct nfs_server *server = NFS_SERVER(dir);
3466
3467                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3468                 if (IS_ERR(data->label))
3469                         goto out_free;
3470
3471                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3472                 data->msg.rpc_argp = &data->arg;
3473                 data->msg.rpc_resp = &data->res;
3474                 data->arg.dir_fh = NFS_FH(dir);
3475                 data->arg.server = server;
3476                 data->arg.name = name;
3477                 data->arg.attrs = sattr;
3478                 data->arg.ftype = ftype;
3479                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3480                 data->res.server = server;
3481                 data->res.fh = &data->fh;
3482                 data->res.fattr = &data->fattr;
3483                 data->res.label = data->label;
3484                 nfs_fattr_init(data->res.fattr);
3485         }
3486         return data;
3487 out_free:
3488         kfree(data);
3489         return NULL;
3490 }
3491
3492 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3493 {
3494         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3495                                     &data->arg.seq_args, &data->res.seq_res, 1);
3496         if (status == 0) {
3497                 update_changeattr(dir, &data->res.dir_cinfo);
3498                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3499         }
3500         return status;
3501 }
3502
3503 static void nfs4_free_createdata(struct nfs4_createdata *data)
3504 {
3505         nfs4_label_free(data->label);
3506         kfree(data);
3507 }
3508
3509 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3510                 struct page *page, unsigned int len, struct iattr *sattr,
3511                 struct nfs4_label *label)
3512 {
3513         struct nfs4_createdata *data;
3514         int status = -ENAMETOOLONG;
3515
3516         if (len > NFS4_MAXPATHLEN)
3517                 goto out;
3518
3519         status = -ENOMEM;
3520         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3521         if (data == NULL)
3522                 goto out;
3523
3524         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3525         data->arg.u.symlink.pages = &page;
3526         data->arg.u.symlink.len = len;
3527         data->arg.label = label;
3528
3529         status = nfs4_do_create(dir, dentry, data);
3530
3531         nfs4_free_createdata(data);
3532 out:
3533         return status;
3534 }
3535
3536 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3537                 struct page *page, unsigned int len, struct iattr *sattr)
3538 {
3539         struct nfs4_exception exception = { };
3540         struct nfs4_label l, *label = NULL;
3541         int err;
3542
3543         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3544
3545         do {
3546                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3547                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3548                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3549                                 &exception);
3550         } while (exception.retry);
3551
3552         nfs4_label_release_security(label);
3553         return err;
3554 }
3555
3556 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3557                 struct iattr *sattr, struct nfs4_label *label)
3558 {
3559         struct nfs4_createdata *data;
3560         int status = -ENOMEM;
3561
3562         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3563         if (data == NULL)
3564                 goto out;
3565
3566         data->arg.label = label;
3567         status = nfs4_do_create(dir, dentry, data);
3568
3569         nfs4_free_createdata(data);
3570 out:
3571         return status;
3572 }
3573
3574 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3575                 struct iattr *sattr)
3576 {
3577         struct nfs4_exception exception = { };
3578         struct nfs4_label l, *label = NULL;
3579         int err;
3580
3581         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3582
3583         sattr->ia_mode &= ~current_umask();
3584         do {
3585                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3586                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3587                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3588                                 &exception);
3589         } while (exception.retry);
3590         nfs4_label_release_security(label);
3591
3592         return err;
3593 }
3594
3595 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3596                 u64 cookie, struct page **pages, unsigned int count, int plus)
3597 {
3598         struct inode            *dir = dentry->d_inode;
3599         struct nfs4_readdir_arg args = {
3600                 .fh = NFS_FH(dir),
3601                 .pages = pages,
3602                 .pgbase = 0,
3603                 .count = count,
3604                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3605                 .plus = plus,
3606         };
3607         struct nfs4_readdir_res res;
3608         struct rpc_message msg = {
3609                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3610                 .rpc_argp = &args,
3611                 .rpc_resp = &res,
3612                 .rpc_cred = cred,
3613         };
3614         int                     status;
3615
3616         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3617                         dentry->d_parent->d_name.name,
3618                         dentry->d_name.name,
3619                         (unsigned long long)cookie);
3620         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3621         res.pgbase = args.pgbase;
3622         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3623         if (status >= 0) {
3624                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3625                 status += args.pgbase;
3626         }
3627
3628         nfs_invalidate_atime(dir);
3629
3630         dprintk("%s: returns %d\n", __func__, status);
3631         return status;
3632 }
3633
3634 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3635                 u64 cookie, struct page **pages, unsigned int count, int plus)
3636 {
3637         struct nfs4_exception exception = { };
3638         int err;
3639         do {
3640                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3641                                 pages, count, plus);
3642                 trace_nfs4_readdir(dentry->d_inode, err);
3643                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3644                                 &exception);
3645         } while (exception.retry);
3646         return err;
3647 }
3648
3649 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3650                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3651 {
3652         struct nfs4_createdata *data;
3653         int mode = sattr->ia_mode;
3654         int status = -ENOMEM;
3655
3656         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3657         if (data == NULL)
3658                 goto out;
3659
3660         if (S_ISFIFO(mode))
3661                 data->arg.ftype = NF4FIFO;
3662         else if (S_ISBLK(mode)) {
3663                 data->arg.ftype = NF4BLK;
3664                 data->arg.u.device.specdata1 = MAJOR(rdev);
3665                 data->arg.u.device.specdata2 = MINOR(rdev);
3666         }
3667         else if (S_ISCHR(mode)) {
3668                 data->arg.ftype = NF4CHR;
3669                 data->arg.u.device.specdata1 = MAJOR(rdev);
3670                 data->arg.u.device.specdata2 = MINOR(rdev);
3671         } else if (!S_ISSOCK(mode)) {
3672                 status = -EINVAL;
3673                 goto out_free;
3674         }
3675
3676         data->arg.label = label;
3677         status = nfs4_do_create(dir, dentry, data);
3678 out_free:
3679         nfs4_free_createdata(data);
3680 out:
3681         return status;
3682 }
3683
3684 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3685                 struct iattr *sattr, dev_t rdev)
3686 {
3687         struct nfs4_exception exception = { };
3688         struct nfs4_label l, *label = NULL;
3689         int err;
3690
3691         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3692
3693         sattr->ia_mode &= ~current_umask();
3694         do {
3695                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3696                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3697                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3698                                 &exception);
3699         } while (exception.retry);
3700
3701         nfs4_label_release_security(label);
3702
3703         return err;
3704 }
3705
3706 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3707                  struct nfs_fsstat *fsstat)
3708 {
3709         struct nfs4_statfs_arg args = {
3710                 .fh = fhandle,
3711                 .bitmask = server->attr_bitmask,
3712         };
3713         struct nfs4_statfs_res res = {
3714                 .fsstat = fsstat,
3715         };
3716         struct rpc_message msg = {
3717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3718                 .rpc_argp = &args,
3719                 .rpc_resp = &res,
3720         };
3721
3722         nfs_fattr_init(fsstat->fattr);
3723         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3724 }
3725
3726 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3727 {
3728         struct nfs4_exception exception = { };
3729         int err;
3730         do {
3731                 err = nfs4_handle_exception(server,
3732                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3733                                 &exception);
3734         } while (exception.retry);
3735         return err;
3736 }
3737
3738 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3739                 struct nfs_fsinfo *fsinfo)
3740 {
3741         struct nfs4_fsinfo_arg args = {
3742                 .fh = fhandle,
3743                 .bitmask = server->attr_bitmask,
3744         };
3745         struct nfs4_fsinfo_res res = {
3746                 .fsinfo = fsinfo,
3747         };
3748         struct rpc_message msg = {
3749                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3750                 .rpc_argp = &args,
3751                 .rpc_resp = &res,
3752         };
3753
3754         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3755 }
3756
3757 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3758 {
3759         struct nfs4_exception exception = { };
3760         unsigned long now = jiffies;
3761         int err;
3762
3763         do {
3764                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3765                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3766                 if (err == 0) {
3767                         struct nfs_client *clp = server->nfs_client;
3768
3769                         spin_lock(&clp->cl_lock);
3770                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3771                         clp->cl_last_renewal = now;
3772                         spin_unlock(&clp->cl_lock);
3773                         break;
3774                 }
3775                 err = nfs4_handle_exception(server, err, &exception);
3776         } while (exception.retry);
3777         return err;
3778 }
3779
3780 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3781 {
3782         int error;
3783
3784         nfs_fattr_init(fsinfo->fattr);
3785         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3786         if (error == 0) {
3787                 /* block layout checks this! */
3788                 server->pnfs_blksize = fsinfo->blksize;
3789                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3790         }
3791
3792         return error;
3793 }
3794
3795 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3796                 struct nfs_pathconf *pathconf)
3797 {
3798         struct nfs4_pathconf_arg args = {
3799                 .fh = fhandle,
3800                 .bitmask = server->attr_bitmask,
3801         };
3802         struct nfs4_pathconf_res res = {
3803                 .pathconf = pathconf,
3804         };
3805         struct rpc_message msg = {
3806                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3807                 .rpc_argp = &args,
3808                 .rpc_resp = &res,
3809         };
3810
3811         /* None of the pathconf attributes are mandatory to implement */
3812         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3813                 memset(pathconf, 0, sizeof(*pathconf));
3814                 return 0;
3815         }
3816
3817         nfs_fattr_init(pathconf->fattr);
3818         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3819 }
3820
3821 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3822                 struct nfs_pathconf *pathconf)
3823 {
3824         struct nfs4_exception exception = { };
3825         int err;
3826
3827         do {
3828                 err = nfs4_handle_exception(server,
3829                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3830                                 &exception);
3831         } while (exception.retry);
3832         return err;
3833 }
3834
3835 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3836                 const struct nfs_open_context *ctx,
3837                 const struct nfs_lock_context *l_ctx,
3838                 fmode_t fmode)
3839 {
3840         const struct nfs_lockowner *lockowner = NULL;
3841
3842         if (l_ctx != NULL)
3843                 lockowner = &l_ctx->lockowner;
3844         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3845 }
3846 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3847
3848 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3849                 const struct nfs_open_context *ctx,
3850                 const struct nfs_lock_context *l_ctx,
3851                 fmode_t fmode)
3852 {
3853         nfs4_stateid current_stateid;
3854
3855         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3856                 return false;
3857         return nfs4_stateid_match(stateid, &current_stateid);
3858 }
3859
3860 static bool nfs4_error_stateid_expired(int err)
3861 {
3862         switch (err) {
3863         case -NFS4ERR_DELEG_REVOKED:
3864         case -NFS4ERR_ADMIN_REVOKED:
3865         case -NFS4ERR_BAD_STATEID:
3866         case -NFS4ERR_STALE_STATEID:
3867         case -NFS4ERR_OLD_STATEID:
3868         case -NFS4ERR_OPENMODE:
3869         case -NFS4ERR_EXPIRED:
3870                 return true;
3871         }
3872         return false;
3873 }
3874
3875 void __nfs4_read_done_cb(struct nfs_read_data *data)
3876 {
3877         nfs_invalidate_atime(data->header->inode);
3878 }
3879
3880 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3881 {
3882         struct nfs_server *server = NFS_SERVER(data->header->inode);
3883
3884         trace_nfs4_read(data, task->tk_status);
3885         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3886                 rpc_restart_call_prepare(task);
3887                 return -EAGAIN;
3888         }
3889
3890         __nfs4_read_done_cb(data);
3891         if (task->tk_status > 0)
3892                 renew_lease(server, data->timestamp);
3893         return 0;
3894 }
3895
3896 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3897                 struct nfs_readargs *args)
3898 {
3899
3900         if (!nfs4_error_stateid_expired(task->tk_status) ||
3901                 nfs4_stateid_is_current(&args->stateid,
3902                                 args->context,
3903                                 args->lock_context,
3904                                 FMODE_READ))
3905                 return false;
3906         rpc_restart_call_prepare(task);
3907         return true;
3908 }
3909
3910 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3911 {
3912
3913         dprintk("--> %s\n", __func__);
3914
3915         if (!nfs4_sequence_done(task, &data->res.seq_res))
3916                 return -EAGAIN;
3917         if (nfs4_read_stateid_changed(task, &data->args))
3918                 return -EAGAIN;
3919         return data->read_done_cb ? data->read_done_cb(task, data) :
3920                                     nfs4_read_done_cb(task, data);
3921 }
3922
3923 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3924 {
3925         data->timestamp   = jiffies;
3926         data->read_done_cb = nfs4_read_done_cb;
3927         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3928         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3929 }
3930
3931 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3932 {
3933         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3934                         &data->args.seq_args,
3935                         &data->res.seq_res,
3936                         task))
3937                 return;
3938         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3939                         data->args.lock_context, FMODE_READ);
3940 }
3941
3942 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3943 {
3944         struct inode *inode = data->header->inode;
3945
3946         trace_nfs4_write(data, task->tk_status);
3947         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3948                 rpc_restart_call_prepare(task);
3949                 return -EAGAIN;
3950         }
3951         if (task->tk_status >= 0) {
3952                 renew_lease(NFS_SERVER(inode), data->timestamp);
3953                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3954         }
3955         return 0;
3956 }
3957
3958 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3959                 struct nfs_writeargs *args)
3960 {
3961
3962         if (!nfs4_error_stateid_expired(task->tk_status) ||
3963                 nfs4_stateid_is_current(&args->stateid,
3964                                 args->context,
3965                                 args->lock_context,
3966                                 FMODE_WRITE))
3967                 return false;
3968         rpc_restart_call_prepare(task);
3969         return true;
3970 }
3971
3972 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3973 {
3974         if (!nfs4_sequence_done(task, &data->res.seq_res))
3975                 return -EAGAIN;
3976         if (nfs4_write_stateid_changed(task, &data->args))
3977                 return -EAGAIN;
3978         return data->write_done_cb ? data->write_done_cb(task, data) :
3979                 nfs4_write_done_cb(task, data);
3980 }
3981
3982 static
3983 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3984 {
3985         const struct nfs_pgio_header *hdr = data->header;
3986
3987         /* Don't request attributes for pNFS or O_DIRECT writes */
3988         if (data->ds_clp != NULL || hdr->dreq != NULL)
3989                 return false;
3990         /* Otherwise, request attributes if and only if we don't hold
3991          * a delegation
3992          */
3993         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3994 }
3995
3996 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3997 {
3998         struct nfs_server *server = NFS_SERVER(data->header->inode);
3999
4000         if (!nfs4_write_need_cache_consistency_data(data)) {
4001                 data->args.bitmask = NULL;
4002                 data->res.fattr = NULL;
4003         } else
4004                 data->args.bitmask = server->cache_consistency_bitmask;
4005
4006         if (!data->write_done_cb)
4007                 data->write_done_cb = nfs4_write_done_cb;
4008         data->res.server = server;
4009         data->timestamp   = jiffies;
4010
4011         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4012         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4013 }
4014
4015 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4016 {
4017         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4018                         &data->args.seq_args,
4019                         &data->res.seq_res,
4020                         task))
4021                 return;
4022         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4023                         data->args.lock_context, FMODE_WRITE);
4024 }
4025
4026 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4027 {
4028         nfs4_setup_sequence(NFS_SERVER(data->inode),
4029                         &data->args.seq_args,
4030                         &data->res.seq_res,
4031                         task);
4032 }
4033
4034 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4035 {
4036         struct inode *inode = data->inode;
4037
4038         trace_nfs4_commit(data, task->tk_status);
4039         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4040                 rpc_restart_call_prepare(task);
4041                 return -EAGAIN;
4042         }
4043         return 0;
4044 }
4045
4046 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4047 {
4048         if (!nfs4_sequence_done(task, &data->res.seq_res))
4049                 return -EAGAIN;
4050         return data->commit_done_cb(task, data);
4051 }
4052
4053 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4054 {
4055         struct nfs_server *server = NFS_SERVER(data->inode);
4056
4057         if (data->commit_done_cb == NULL)
4058                 data->commit_done_cb = nfs4_commit_done_cb;
4059         data->res.server = server;
4060         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4061         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4062 }
4063
4064 struct nfs4_renewdata {
4065         struct nfs_client       *client;
4066         unsigned long           timestamp;
4067 };
4068
4069 /*
4070  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4071  * standalone procedure for queueing an asynchronous RENEW.
4072  */
4073 static void nfs4_renew_release(void *calldata)
4074 {
4075         struct nfs4_renewdata *data = calldata;
4076         struct nfs_client *clp = data->client;
4077
4078         if (atomic_read(&clp->cl_count) > 1)
4079                 nfs4_schedule_state_renewal(clp);
4080         nfs_put_client(clp);
4081         kfree(data);
4082 }
4083
4084 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4085 {
4086         struct nfs4_renewdata *data = calldata;
4087         struct nfs_client *clp = data->client;
4088         unsigned long timestamp = data->timestamp;
4089
4090         trace_nfs4_renew_async(clp, task->tk_status);
4091         if (task->tk_status < 0) {
4092                 /* Unless we're shutting down, schedule state recovery! */
4093                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4094                         return;
4095                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4096                         nfs4_schedule_lease_recovery(clp);
4097                         return;
4098                 }
4099                 nfs4_schedule_path_down_recovery(clp);
4100         }
4101         do_renew_lease(clp, timestamp);
4102 }
4103
4104 static const struct rpc_call_ops nfs4_renew_ops = {
4105         .rpc_call_done = nfs4_renew_done,
4106         .rpc_release = nfs4_renew_release,
4107 };
4108
4109 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4110 {
4111         struct rpc_message msg = {
4112                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4113                 .rpc_argp       = clp,
4114                 .rpc_cred       = cred,
4115         };
4116         struct nfs4_renewdata *data;
4117
4118         if (renew_flags == 0)
4119                 return 0;
4120         if (!atomic_inc_not_zero(&clp->cl_count))
4121                 return -EIO;
4122         data = kmalloc(sizeof(*data), GFP_NOFS);
4123         if (data == NULL)
4124                 return -ENOMEM;
4125         data->client = clp;
4126         data->timestamp = jiffies;
4127         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4128                         &nfs4_renew_ops, data);
4129 }
4130
4131 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4132 {
4133         struct rpc_message msg = {
4134                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4135                 .rpc_argp       = clp,
4136                 .rpc_cred       = cred,
4137         };
4138         unsigned long now = jiffies;
4139         int status;
4140
4141         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4142         if (status < 0)
4143                 return status;
4144         do_renew_lease(clp, now);
4145         return 0;
4146 }
4147
4148 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4149 {
4150         return (server->caps & NFS_CAP_ACLS)
4151                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4152                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4153 }
4154
4155 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4156  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4157  * the stack.
4158  */
4159 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4160
4161 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4162                 struct page **pages, unsigned int *pgbase)
4163 {
4164         struct page *newpage, **spages;
4165         int rc = 0;
4166         size_t len;
4167         spages = pages;
4168
4169         do {
4170                 len = min_t(size_t, PAGE_SIZE, buflen);
4171                 newpage = alloc_page(GFP_KERNEL);
4172
4173                 if (newpage == NULL)
4174                         goto unwind;
4175                 memcpy(page_address(newpage), buf, len);
4176                 buf += len;
4177                 buflen -= len;
4178                 *pages++ = newpage;
4179                 rc++;
4180         } while (buflen != 0);
4181
4182         return rc;
4183
4184 unwind:
4185         for(; rc > 0; rc--)
4186                 __free_page(spages[rc-1]);
4187         return -ENOMEM;
4188 }
4189
4190 struct nfs4_cached_acl {
4191         int cached;
4192         size_t len;
4193         char data[0];
4194 };
4195
4196 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4197 {
4198         struct nfs_inode *nfsi = NFS_I(inode);
4199
4200         spin_lock(&inode->i_lock);
4201         kfree(nfsi->nfs4_acl);
4202         nfsi->nfs4_acl = acl;
4203         spin_unlock(&inode->i_lock);
4204 }
4205
4206 static void nfs4_zap_acl_attr(struct inode *inode)
4207 {
4208         nfs4_set_cached_acl(inode, NULL);
4209 }
4210
4211 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4212 {
4213         struct nfs_inode *nfsi = NFS_I(inode);
4214         struct nfs4_cached_acl *acl;
4215         int ret = -ENOENT;
4216
4217         spin_lock(&inode->i_lock);
4218         acl = nfsi->nfs4_acl;
4219         if (acl == NULL)
4220                 goto out;
4221         if (buf == NULL) /* user is just asking for length */
4222                 goto out_len;
4223         if (acl->cached == 0)
4224                 goto out;
4225         ret = -ERANGE; /* see getxattr(2) man page */
4226         if (acl->len > buflen)
4227                 goto out;
4228         memcpy(buf, acl->data, acl->len);
4229 out_len:
4230         ret = acl->len;
4231 out:
4232         spin_unlock(&inode->i_lock);
4233         return ret;
4234 }
4235
4236 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4237 {
4238         struct nfs4_cached_acl *acl;
4239         size_t buflen = sizeof(*acl) + acl_len;
4240
4241         if (buflen <= PAGE_SIZE) {
4242                 acl = kmalloc(buflen, GFP_KERNEL);
4243                 if (acl == NULL)
4244                         goto out;
4245                 acl->cached = 1;
4246                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4247         } else {
4248                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4249                 if (acl == NULL)
4250                         goto out;
4251                 acl->cached = 0;
4252         }
4253         acl->len = acl_len;
4254 out:
4255         nfs4_set_cached_acl(inode, acl);
4256 }
4257
4258 /*
4259  * The getxattr API returns the required buffer length when called with a
4260  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4261  * the required buf.  On a NULL buf, we send a page of data to the server
4262  * guessing that the ACL request can be serviced by a page. If so, we cache
4263  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4264  * the cache. If not so, we throw away the page, and cache the required
4265  * length. The next getxattr call will then produce another round trip to
4266  * the server, this time with the input buf of the required size.
4267  */
4268 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4269 {
4270         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4271         struct nfs_getaclargs args = {
4272                 .fh = NFS_FH(inode),
4273                 .acl_pages = pages,
4274                 .acl_len = buflen,
4275         };
4276         struct nfs_getaclres res = {
4277                 .acl_len = buflen,
4278         };
4279         struct rpc_message msg = {
4280                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4281                 .rpc_argp = &args,
4282                 .rpc_resp = &res,
4283         };
4284         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4285         int ret = -ENOMEM, i;
4286
4287         /* As long as we're doing a round trip to the server anyway,
4288          * let's be prepared for a page of acl data. */
4289         if (npages == 0)
4290                 npages = 1;
4291         if (npages > ARRAY_SIZE(pages))
4292                 return -ERANGE;
4293
4294         for (i = 0; i < npages; i++) {
4295                 pages[i] = alloc_page(GFP_KERNEL);
4296                 if (!pages[i])
4297                         goto out_free;
4298         }
4299
4300         /* for decoding across pages */
4301         res.acl_scratch = alloc_page(GFP_KERNEL);
4302         if (!res.acl_scratch)
4303                 goto out_free;
4304
4305         args.acl_len = npages * PAGE_SIZE;
4306         args.acl_pgbase = 0;
4307
4308         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4309                 __func__, buf, buflen, npages, args.acl_len);
4310         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4311                              &msg, &args.seq_args, &res.seq_res, 0);
4312         if (ret)
4313                 goto out_free;
4314
4315         /* Handle the case where the passed-in buffer is too short */
4316         if (res.acl_flags & NFS4_ACL_TRUNC) {
4317                 /* Did the user only issue a request for the acl length? */
4318                 if (buf == NULL)
4319                         goto out_ok;
4320                 ret = -ERANGE;
4321                 goto out_free;
4322         }
4323         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4324         if (buf) {
4325                 if (res.acl_len > buflen) {
4326                         ret = -ERANGE;
4327                         goto out_free;
4328                 }
4329                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4330         }
4331 out_ok:
4332         ret = res.acl_len;
4333 out_free:
4334         for (i = 0; i < npages; i++)
4335                 if (pages[i])
4336                         __free_page(pages[i]);
4337         if (res.acl_scratch)
4338                 __free_page(res.acl_scratch);
4339         return ret;
4340 }
4341
4342 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4343 {
4344         struct nfs4_exception exception = { };
4345         ssize_t ret;
4346         do {
4347                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4348                 trace_nfs4_get_acl(inode, ret);
4349                 if (ret >= 0)
4350                         break;
4351                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4352         } while (exception.retry);
4353         return ret;
4354 }
4355
4356 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4357 {
4358         struct nfs_server *server = NFS_SERVER(inode);
4359         int ret;
4360
4361         if (!nfs4_server_supports_acls(server))
4362                 return -EOPNOTSUPP;
4363         ret = nfs_revalidate_inode(server, inode);
4364         if (ret < 0)
4365                 return ret;
4366         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4367                 nfs_zap_acl_cache(inode);
4368         ret = nfs4_read_cached_acl(inode, buf, buflen);
4369         if (ret != -ENOENT)
4370                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4371                  * but no cached acl data, just the acl length */
4372                 return ret;
4373         return nfs4_get_acl_uncached(inode, buf, buflen);
4374 }
4375
4376 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4377 {
4378         struct nfs_server *server = NFS_SERVER(inode);
4379         struct page *pages[NFS4ACL_MAXPAGES];
4380         struct nfs_setaclargs arg = {
4381                 .fh             = NFS_FH(inode),
4382                 .acl_pages      = pages,
4383                 .acl_len        = buflen,
4384         };
4385         struct nfs_setaclres res;
4386         struct rpc_message msg = {
4387                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4388                 .rpc_argp       = &arg,
4389                 .rpc_resp       = &res,
4390         };
4391         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4392         int ret, i;
4393
4394         if (!nfs4_server_supports_acls(server))
4395                 return -EOPNOTSUPP;
4396         if (npages > ARRAY_SIZE(pages))
4397                 return -ERANGE;
4398         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4399         if (i < 0)
4400                 return i;
4401         nfs4_inode_return_delegation(inode);
4402         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4403
4404         /*
4405          * Free each page after tx, so the only ref left is
4406          * held by the network stack
4407          */
4408         for (; i > 0; i--)
4409                 put_page(pages[i-1]);
4410
4411         /*
4412          * Acl update can result in inode attribute update.
4413          * so mark the attribute cache invalid.
4414          */
4415         spin_lock(&inode->i_lock);
4416         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4417         spin_unlock(&inode->i_lock);
4418         nfs_access_zap_cache(inode);
4419         nfs_zap_acl_cache(inode);
4420         return ret;
4421 }
4422
4423 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4424 {
4425         struct nfs4_exception exception = { };
4426         int err;
4427         do {
4428                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4429                 trace_nfs4_set_acl(inode, err);
4430                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4431                                 &exception);
4432         } while (exception.retry);
4433         return err;
4434 }
4435
4436 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4437 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4438                                         size_t buflen)
4439 {
4440         struct nfs_server *server = NFS_SERVER(inode);
4441         struct nfs_fattr fattr;
4442         struct nfs4_label label = {0, 0, buflen, buf};
4443
4444         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4445         struct nfs4_getattr_arg args = {
4446                 .fh             = NFS_FH(inode),
4447                 .bitmask        = bitmask,
4448         };
4449         struct nfs4_getattr_res res = {
4450                 .fattr          = &fattr,
4451                 .label          = &label,
4452                 .server         = server,
4453         };
4454         struct rpc_message msg = {
4455                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4456                 .rpc_argp       = &args,
4457                 .rpc_resp       = &res,
4458         };
4459         int ret;
4460
4461         nfs_fattr_init(&fattr);
4462
4463         ret = rpc_call_sync(server->client, &msg, 0);
4464         if (ret)
4465                 return ret;
4466         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4467                 return -ENOENT;
4468         if (buflen < label.len)
4469                 return -ERANGE;
4470         return 0;
4471 }
4472
4473 static int nfs4_get_security_label(struct inode *inode, void *buf,
4474                                         size_t buflen)
4475 {
4476         struct nfs4_exception exception = { };
4477         int err;
4478
4479         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4480                 return -EOPNOTSUPP;
4481
4482         do {
4483                 err = _nfs4_get_security_label(inode, buf, buflen);
4484                 trace_nfs4_get_security_label(inode, err);
4485                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4486                                 &exception);
4487         } while (exception.retry);
4488         return err;
4489 }
4490
4491 static int _nfs4_do_set_security_label(struct inode *inode,
4492                 struct nfs4_label *ilabel,
4493                 struct nfs_fattr *fattr,
4494                 struct nfs4_label *olabel)
4495 {
4496
4497         struct iattr sattr = {0};
4498         struct nfs_server *server = NFS_SERVER(inode);
4499         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4500         struct nfs_setattrargs args = {
4501                 .fh             = NFS_FH(inode),
4502                 .iap            = &sattr,
4503                 .server         = server,
4504                 .bitmask        = bitmask,
4505                 .label          = ilabel,
4506         };
4507         struct nfs_setattrres res = {
4508                 .fattr          = fattr,
4509                 .label          = olabel,
4510                 .server         = server,
4511         };
4512         struct rpc_message msg = {
4513                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4514                 .rpc_argp       = &args,
4515                 .rpc_resp       = &res,
4516         };
4517         int status;
4518
4519         nfs4_stateid_copy(&args.stateid, &zero_stateid);
4520
4521         status = rpc_call_sync(server->client, &msg, 0);
4522         if (status)
4523                 dprintk("%s failed: %d\n", __func__, status);
4524
4525         return status;
4526 }
4527
4528 static int nfs4_do_set_security_label(struct inode *inode,
4529                 struct nfs4_label *ilabel,
4530                 struct nfs_fattr *fattr,
4531                 struct nfs4_label *olabel)
4532 {
4533         struct nfs4_exception exception = { };
4534         int err;
4535
4536         do {
4537                 err = _nfs4_do_set_security_label(inode, ilabel,
4538                                 fattr, olabel);
4539                 trace_nfs4_set_security_label(inode, err);
4540                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4541                                 &exception);
4542         } while (exception.retry);
4543         return err;
4544 }
4545
4546 static int
4547 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4548 {
4549         struct nfs4_label ilabel, *olabel = NULL;
4550         struct nfs_fattr fattr;
4551         struct rpc_cred *cred;
4552         struct inode *inode = dentry->d_inode;
4553         int status;
4554
4555         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4556                 return -EOPNOTSUPP;
4557
4558         nfs_fattr_init(&fattr);
4559
4560         ilabel.pi = 0;
4561         ilabel.lfs = 0;
4562         ilabel.label = (char *)buf;
4563         ilabel.len = buflen;
4564
4565         cred = rpc_lookup_cred();
4566         if (IS_ERR(cred))
4567                 return PTR_ERR(cred);
4568
4569         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4570         if (IS_ERR(olabel)) {
4571                 status = -PTR_ERR(olabel);
4572                 goto out;
4573         }
4574
4575         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4576         if (status == 0)
4577                 nfs_setsecurity(inode, &fattr, olabel);
4578
4579         nfs4_label_free(olabel);
4580 out:
4581         put_rpccred(cred);
4582         return status;
4583 }
4584 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4585
4586
4587 static int
4588 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4589 {
4590         struct nfs_client *clp = server->nfs_client;
4591
4592         if (task->tk_status >= 0)
4593                 return 0;
4594         switch(task->tk_status) {
4595                 case -NFS4ERR_DELEG_REVOKED:
4596                 case -NFS4ERR_ADMIN_REVOKED:
4597                 case -NFS4ERR_BAD_STATEID:
4598                         if (state == NULL)
4599                                 break;
4600                         nfs_remove_bad_delegation(state->inode);
4601                 case -NFS4ERR_OPENMODE:
4602                         if (state == NULL)
4603                                 break;
4604                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4605                                 goto stateid_invalid;
4606                         goto wait_on_recovery;
4607                 case -NFS4ERR_EXPIRED:
4608                         if (state != NULL) {
4609                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4610                                         goto stateid_invalid;
4611                         }
4612                 case -NFS4ERR_STALE_STATEID:
4613                 case -NFS4ERR_STALE_CLIENTID:
4614                         nfs4_schedule_lease_recovery(clp);
4615                         goto wait_on_recovery;
4616 #if defined(CONFIG_NFS_V4_1)
4617                 case -NFS4ERR_BADSESSION:
4618                 case -NFS4ERR_BADSLOT:
4619                 case -NFS4ERR_BAD_HIGH_SLOT:
4620                 case -NFS4ERR_DEADSESSION:
4621                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4622                 case -NFS4ERR_SEQ_FALSE_RETRY:
4623                 case -NFS4ERR_SEQ_MISORDERED:
4624                         dprintk("%s ERROR %d, Reset session\n", __func__,
4625                                 task->tk_status);
4626                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4627                         task->tk_status = 0;
4628                         return -EAGAIN;
4629 #endif /* CONFIG_NFS_V4_1 */
4630                 case -NFS4ERR_DELAY:
4631                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4632                 case -NFS4ERR_GRACE:
4633                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4634                         task->tk_status = 0;
4635                         return -EAGAIN;
4636                 case -NFS4ERR_RETRY_UNCACHED_REP:
4637                 case -NFS4ERR_OLD_STATEID:
4638                         task->tk_status = 0;
4639                         return -EAGAIN;
4640         }
4641         task->tk_status = nfs4_map_errors(task->tk_status);
4642         return 0;
4643 stateid_invalid:
4644         task->tk_status = -EIO;
4645         return 0;
4646 wait_on_recovery:
4647         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4648         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4649                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4650         task->tk_status = 0;
4651         return -EAGAIN;
4652 }
4653
4654 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4655                                     nfs4_verifier *bootverf)
4656 {
4657         __be32 verf[2];
4658
4659         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4660                 /* An impossible timestamp guarantees this value
4661                  * will never match a generated boot time. */
4662                 verf[0] = 0;
4663                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4664         } else {
4665                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4666                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4667                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4668         }
4669         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4670 }
4671
4672 static unsigned int
4673 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4674                                    char *buf, size_t len)
4675 {
4676         unsigned int result;
4677
4678         rcu_read_lock();
4679         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4680                                 clp->cl_ipaddr,
4681                                 rpc_peeraddr2str(clp->cl_rpcclient,
4682                                                         RPC_DISPLAY_ADDR),
4683                                 rpc_peeraddr2str(clp->cl_rpcclient,
4684                                                         RPC_DISPLAY_PROTO));
4685         rcu_read_unlock();
4686         return result;
4687 }
4688
4689 static unsigned int
4690 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4691                                 char *buf, size_t len)
4692 {
4693         const char *nodename = clp->cl_rpcclient->cl_nodename;
4694
4695         if (nfs4_client_id_uniquifier[0] != '\0')
4696                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4697                                 clp->rpc_ops->version,
4698                                 clp->cl_minorversion,
4699                                 nfs4_client_id_uniquifier,
4700                                 nodename);
4701         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4702                                 clp->rpc_ops->version, clp->cl_minorversion,
4703                                 nodename);
4704 }
4705
4706 /**
4707  * nfs4_proc_setclientid - Negotiate client ID
4708  * @clp: state data structure
4709  * @program: RPC program for NFSv4 callback service
4710  * @port: IP port number for NFS4 callback service
4711  * @cred: RPC credential to use for this call
4712  * @res: where to place the result
4713  *
4714  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4715  */
4716 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4717                 unsigned short port, struct rpc_cred *cred,
4718                 struct nfs4_setclientid_res *res)
4719 {
4720         nfs4_verifier sc_verifier;
4721         struct nfs4_setclientid setclientid = {
4722                 .sc_verifier = &sc_verifier,
4723                 .sc_prog = program,
4724                 .sc_cb_ident = clp->cl_cb_ident,
4725         };
4726         struct rpc_message msg = {
4727                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4728                 .rpc_argp = &setclientid,
4729                 .rpc_resp = res,
4730                 .rpc_cred = cred,
4731         };
4732         int status;
4733
4734         /* nfs_client_id4 */
4735         nfs4_init_boot_verifier(clp, &sc_verifier);
4736         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4737                 setclientid.sc_name_len =
4738                                 nfs4_init_uniform_client_string(clp,
4739                                                 setclientid.sc_name,
4740                                                 sizeof(setclientid.sc_name));
4741         else
4742                 setclientid.sc_name_len =
4743                                 nfs4_init_nonuniform_client_string(clp,
4744                                                 setclientid.sc_name,
4745                                                 sizeof(setclientid.sc_name));
4746         /* cb_client4 */
4747         rcu_read_lock();
4748         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4749                                 sizeof(setclientid.sc_netid), "%s",
4750                                 rpc_peeraddr2str(clp->cl_rpcclient,
4751                                                         RPC_DISPLAY_NETID));
4752         rcu_read_unlock();
4753         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4754                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4755                                 clp->cl_ipaddr, port >> 8, port & 255);
4756
4757         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4758                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4759                 setclientid.sc_name_len, setclientid.sc_name);
4760         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4761         trace_nfs4_setclientid(clp, status);
4762         dprintk("NFS reply setclientid: %d\n", status);
4763         return status;
4764 }
4765
4766 /**
4767  * nfs4_proc_setclientid_confirm - Confirm client ID
4768  * @clp: state data structure
4769  * @res: result of a previous SETCLIENTID
4770  * @cred: RPC credential to use for this call
4771  *
4772  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4773  */
4774 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4775                 struct nfs4_setclientid_res *arg,
4776                 struct rpc_cred *cred)
4777 {
4778         struct rpc_message msg = {
4779                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4780                 .rpc_argp = arg,
4781                 .rpc_cred = cred,
4782         };
4783         int status;
4784
4785         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4786                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4787                 clp->cl_clientid);
4788         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4789         trace_nfs4_setclientid_confirm(clp, status);
4790         dprintk("NFS reply setclientid_confirm: %d\n", status);
4791         return status;
4792 }
4793
4794 struct nfs4_delegreturndata {
4795         struct nfs4_delegreturnargs args;
4796         struct nfs4_delegreturnres res;
4797         struct nfs_fh fh;
4798         nfs4_stateid stateid;
4799         unsigned long timestamp;
4800         struct nfs_fattr fattr;
4801         int rpc_status;
4802 };
4803
4804 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4805 {
4806         struct nfs4_delegreturndata *data = calldata;
4807
4808         if (!nfs4_sequence_done(task, &data->res.seq_res))
4809                 return;
4810
4811         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4812         switch (task->tk_status) {
4813         case -NFS4ERR_STALE_STATEID:
4814         case -NFS4ERR_EXPIRED:
4815         case 0:
4816                 renew_lease(data->res.server, data->timestamp);
4817                 break;
4818         default:
4819                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4820                                 -EAGAIN) {
4821                         rpc_restart_call_prepare(task);
4822                         return;
4823                 }
4824         }
4825         data->rpc_status = task->tk_status;
4826 }
4827
4828 static void nfs4_delegreturn_release(void *calldata)
4829 {
4830         kfree(calldata);
4831 }
4832
4833 #if defined(CONFIG_NFS_V4_1)
4834 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4835 {
4836         struct nfs4_delegreturndata *d_data;
4837
4838         d_data = (struct nfs4_delegreturndata *)data;
4839
4840         nfs4_setup_sequence(d_data->res.server,
4841                         &d_data->args.seq_args,
4842                         &d_data->res.seq_res,
4843                         task);
4844 }
4845 #endif /* CONFIG_NFS_V4_1 */
4846
4847 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4848 #if defined(CONFIG_NFS_V4_1)
4849         .rpc_call_prepare = nfs4_delegreturn_prepare,
4850 #endif /* CONFIG_NFS_V4_1 */
4851         .rpc_call_done = nfs4_delegreturn_done,
4852         .rpc_release = nfs4_delegreturn_release,
4853 };
4854
4855 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4856 {
4857         struct nfs4_delegreturndata *data;
4858         struct nfs_server *server = NFS_SERVER(inode);
4859         struct rpc_task *task;
4860         struct rpc_message msg = {
4861                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4862                 .rpc_cred = cred,
4863         };
4864         struct rpc_task_setup task_setup_data = {
4865                 .rpc_client = server->client,
4866                 .rpc_message = &msg,
4867                 .callback_ops = &nfs4_delegreturn_ops,
4868                 .flags = RPC_TASK_ASYNC,
4869         };
4870         int status = 0;
4871
4872         data = kzalloc(sizeof(*data), GFP_NOFS);
4873         if (data == NULL)
4874                 return -ENOMEM;
4875         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4876         data->args.fhandle = &data->fh;
4877         data->args.stateid = &data->stateid;
4878         data->args.bitmask = server->cache_consistency_bitmask;
4879         nfs_copy_fh(&data->fh, NFS_FH(inode));
4880         nfs4_stateid_copy(&data->stateid, stateid);
4881         data->res.fattr = &data->fattr;
4882         data->res.server = server;
4883         nfs_fattr_init(data->res.fattr);
4884         data->timestamp = jiffies;
4885         data->rpc_status = 0;
4886
4887         task_setup_data.callback_data = data;
4888         msg.rpc_argp = &data->args;
4889         msg.rpc_resp = &data->res;
4890         task = rpc_run_task(&task_setup_data);
4891         if (IS_ERR(task))
4892                 return PTR_ERR(task);
4893         if (!issync)
4894                 goto out;
4895         status = nfs4_wait_for_completion_rpc_task(task);
4896         if (status != 0)
4897                 goto out;
4898         status = data->rpc_status;
4899         if (status == 0)
4900                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4901         else
4902                 nfs_refresh_inode(inode, &data->fattr);
4903 out:
4904         rpc_put_task(task);
4905         return status;
4906 }
4907
4908 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4909 {
4910         struct nfs_server *server = NFS_SERVER(inode);
4911         struct nfs4_exception exception = { };
4912         int err;
4913         do {
4914                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4915                 trace_nfs4_delegreturn(inode, err);
4916                 switch (err) {
4917                         case -NFS4ERR_STALE_STATEID:
4918                         case -NFS4ERR_EXPIRED:
4919                         case 0:
4920                                 return 0;
4921                 }
4922                 err = nfs4_handle_exception(server, err, &exception);
4923         } while (exception.retry);
4924         return err;
4925 }
4926
4927 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4928 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4929
4930 /*
4931  * sleep, with exponential backoff, and retry the LOCK operation.
4932  */
4933 static unsigned long
4934 nfs4_set_lock_task_retry(unsigned long timeout)
4935 {
4936         freezable_schedule_timeout_killable_unsafe(timeout);
4937         timeout <<= 1;
4938         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4939                 return NFS4_LOCK_MAXTIMEOUT;
4940         return timeout;
4941 }
4942
4943 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4944 {
4945         struct inode *inode = state->inode;
4946         struct nfs_server *server = NFS_SERVER(inode);
4947         struct nfs_client *clp = server->nfs_client;
4948         struct nfs_lockt_args arg = {
4949                 .fh = NFS_FH(inode),
4950                 .fl = request,
4951         };
4952         struct nfs_lockt_res res = {
4953                 .denied = request,
4954         };
4955         struct rpc_message msg = {
4956                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4957                 .rpc_argp       = &arg,
4958                 .rpc_resp       = &res,
4959                 .rpc_cred       = state->owner->so_cred,
4960         };
4961         struct nfs4_lock_state *lsp;
4962         int status;
4963
4964         arg.lock_owner.clientid = clp->cl_clientid;
4965         status = nfs4_set_lock_state(state, request);
4966         if (status != 0)
4967                 goto out;
4968         lsp = request->fl_u.nfs4_fl.owner;
4969         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4970         arg.lock_owner.s_dev = server->s_dev;
4971         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4972         switch (status) {
4973                 case 0:
4974                         request->fl_type = F_UNLCK;
4975                         break;
4976                 case -NFS4ERR_DENIED:
4977                         status = 0;
4978         }
4979         request->fl_ops->fl_release_private(request);
4980 out:
4981         return status;
4982 }
4983
4984 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4985 {
4986         struct nfs4_exception exception = { };
4987         int err;
4988
4989         do {
4990                 err = _nfs4_proc_getlk(state, cmd, request);
4991                 trace_nfs4_get_lock(request, state, cmd, err);
4992                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
4993                                 &exception);
4994         } while (exception.retry);
4995         return err;
4996 }
4997
4998 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4999 {
5000         int res = 0;
5001         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5002                 case FL_POSIX:
5003                         res = posix_lock_file_wait(file, fl);
5004                         break;
5005                 case FL_FLOCK:
5006                         res = flock_lock_file_wait(file, fl);
5007                         break;
5008                 default:
5009                         BUG();
5010         }
5011         return res;
5012 }
5013
5014 struct nfs4_unlockdata {
5015         struct nfs_locku_args arg;
5016         struct nfs_locku_res res;
5017         struct nfs4_lock_state *lsp;
5018         struct nfs_open_context *ctx;
5019         struct file_lock fl;
5020         const struct nfs_server *server;
5021         unsigned long timestamp;
5022 };
5023
5024 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5025                 struct nfs_open_context *ctx,
5026                 struct nfs4_lock_state *lsp,
5027                 struct nfs_seqid *seqid)
5028 {
5029         struct nfs4_unlockdata *p;
5030         struct inode *inode = lsp->ls_state->inode;
5031
5032         p = kzalloc(sizeof(*p), GFP_NOFS);
5033         if (p == NULL)
5034                 return NULL;
5035         p->arg.fh = NFS_FH(inode);
5036         p->arg.fl = &p->fl;
5037         p->arg.seqid = seqid;
5038         p->res.seqid = seqid;
5039         p->arg.stateid = &lsp->ls_stateid;
5040         p->lsp = lsp;
5041         atomic_inc(&lsp->ls_count);
5042         /* Ensure we don't close file until we're done freeing locks! */
5043         p->ctx = get_nfs_open_context(ctx);
5044         memcpy(&p->fl, fl, sizeof(p->fl));
5045         p->server = NFS_SERVER(inode);
5046         return p;
5047 }
5048
5049 static void nfs4_locku_release_calldata(void *data)
5050 {
5051         struct nfs4_unlockdata *calldata = data;
5052         nfs_free_seqid(calldata->arg.seqid);
5053         nfs4_put_lock_state(calldata->lsp);
5054         put_nfs_open_context(calldata->ctx);
5055         kfree(calldata);
5056 }
5057
5058 static void nfs4_locku_done(struct rpc_task *task, void *data)
5059 {
5060         struct nfs4_unlockdata *calldata = data;
5061
5062         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5063                 return;
5064         switch (task->tk_status) {
5065                 case 0:
5066                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5067                                         &calldata->res.stateid);
5068                         renew_lease(calldata->server, calldata->timestamp);
5069                         break;
5070                 case -NFS4ERR_BAD_STATEID:
5071                 case -NFS4ERR_OLD_STATEID:
5072                 case -NFS4ERR_STALE_STATEID:
5073                 case -NFS4ERR_EXPIRED:
5074                         break;
5075                 default:
5076                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5077                                 rpc_restart_call_prepare(task);
5078         }
5079         nfs_release_seqid(calldata->arg.seqid);
5080 }
5081
5082 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5083 {
5084         struct nfs4_unlockdata *calldata = data;
5085
5086         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5087                 goto out_wait;
5088         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5089                 /* Note: exit _without_ running nfs4_locku_done */
5090                 goto out_no_action;
5091         }
5092         calldata->timestamp = jiffies;
5093         if (nfs4_setup_sequence(calldata->server,
5094                                 &calldata->arg.seq_args,
5095                                 &calldata->res.seq_res,
5096                                 task) != 0)
5097                 nfs_release_seqid(calldata->arg.seqid);
5098         return;
5099 out_no_action:
5100         task->tk_action = NULL;
5101 out_wait:
5102         nfs4_sequence_done(task, &calldata->res.seq_res);
5103 }
5104
5105 static const struct rpc_call_ops nfs4_locku_ops = {
5106         .rpc_call_prepare = nfs4_locku_prepare,
5107         .rpc_call_done = nfs4_locku_done,
5108         .rpc_release = nfs4_locku_release_calldata,
5109 };
5110
5111 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5112                 struct nfs_open_context *ctx,
5113                 struct nfs4_lock_state *lsp,
5114                 struct nfs_seqid *seqid)
5115 {
5116         struct nfs4_unlockdata *data;
5117         struct rpc_message msg = {
5118                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5119                 .rpc_cred = ctx->cred,
5120         };
5121         struct rpc_task_setup task_setup_data = {
5122                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5123                 .rpc_message = &msg,
5124                 .callback_ops = &nfs4_locku_ops,
5125                 .workqueue = nfsiod_workqueue,
5126                 .flags = RPC_TASK_ASYNC,
5127         };
5128
5129         /* Ensure this is an unlock - when canceling a lock, the
5130          * canceled lock is passed in, and it won't be an unlock.
5131          */
5132         fl->fl_type = F_UNLCK;
5133
5134         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5135         if (data == NULL) {
5136                 nfs_free_seqid(seqid);
5137                 return ERR_PTR(-ENOMEM);
5138         }
5139
5140         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5141         msg.rpc_argp = &data->arg;
5142         msg.rpc_resp = &data->res;
5143         task_setup_data.callback_data = data;
5144         return rpc_run_task(&task_setup_data);
5145 }
5146
5147 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5148 {
5149         struct inode *inode = state->inode;
5150         struct nfs4_state_owner *sp = state->owner;
5151         struct nfs_inode *nfsi = NFS_I(inode);
5152         struct nfs_seqid *seqid;
5153         struct nfs4_lock_state *lsp;
5154         struct rpc_task *task;
5155         int status = 0;
5156         unsigned char fl_flags = request->fl_flags;
5157
5158         status = nfs4_set_lock_state(state, request);
5159         /* Unlock _before_ we do the RPC call */
5160         request->fl_flags |= FL_EXISTS;
5161         /* Exclude nfs_delegation_claim_locks() */
5162         mutex_lock(&sp->so_delegreturn_mutex);
5163         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5164         down_read(&nfsi->rwsem);
5165         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5166                 up_read(&nfsi->rwsem);
5167                 mutex_unlock(&sp->so_delegreturn_mutex);
5168                 goto out;
5169         }
5170         up_read(&nfsi->rwsem);
5171         mutex_unlock(&sp->so_delegreturn_mutex);
5172         if (status != 0)
5173                 goto out;
5174         /* Is this a delegated lock? */
5175         lsp = request->fl_u.nfs4_fl.owner;
5176         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5177                 goto out;
5178         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5179         status = -ENOMEM;
5180         if (seqid == NULL)
5181                 goto out;
5182         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5183         status = PTR_ERR(task);
5184         if (IS_ERR(task))
5185                 goto out;
5186         status = nfs4_wait_for_completion_rpc_task(task);
5187         rpc_put_task(task);
5188 out:
5189         request->fl_flags = fl_flags;
5190         trace_nfs4_unlock(request, state, F_SETLK, status);
5191         return status;
5192 }
5193
5194 struct nfs4_lockdata {
5195         struct nfs_lock_args arg;
5196         struct nfs_lock_res res;
5197         struct nfs4_lock_state *lsp;
5198         struct nfs_open_context *ctx;
5199         struct file_lock fl;
5200         unsigned long timestamp;
5201         int rpc_status;
5202         int cancelled;
5203         struct nfs_server *server;
5204 };
5205
5206 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5207                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5208                 gfp_t gfp_mask)
5209 {
5210         struct nfs4_lockdata *p;
5211         struct inode *inode = lsp->ls_state->inode;
5212         struct nfs_server *server = NFS_SERVER(inode);
5213
5214         p = kzalloc(sizeof(*p), gfp_mask);
5215         if (p == NULL)
5216                 return NULL;
5217
5218         p->arg.fh = NFS_FH(inode);
5219         p->arg.fl = &p->fl;
5220         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5221         if (p->arg.open_seqid == NULL)
5222                 goto out_free;
5223         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5224         if (p->arg.lock_seqid == NULL)
5225                 goto out_free_seqid;
5226         p->arg.lock_stateid = &lsp->ls_stateid;
5227         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5228         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5229         p->arg.lock_owner.s_dev = server->s_dev;
5230         p->res.lock_seqid = p->arg.lock_seqid;
5231         p->lsp = lsp;
5232         p->server = server;
5233         atomic_inc(&lsp->ls_count);
5234         p->ctx = get_nfs_open_context(ctx);
5235         memcpy(&p->fl, fl, sizeof(p->fl));
5236         return p;
5237 out_free_seqid:
5238         nfs_free_seqid(p->arg.open_seqid);
5239 out_free:
5240         kfree(p);
5241         return NULL;
5242 }
5243
5244 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5245 {
5246         struct nfs4_lockdata *data = calldata;
5247         struct nfs4_state *state = data->lsp->ls_state;
5248
5249         dprintk("%s: begin!\n", __func__);
5250         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5251                 goto out_wait;
5252         /* Do we need to do an open_to_lock_owner? */
5253         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5254                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5255                         goto out_release_lock_seqid;
5256                 }
5257                 data->arg.open_stateid = &state->open_stateid;
5258                 data->arg.new_lock_owner = 1;
5259                 data->res.open_seqid = data->arg.open_seqid;
5260         } else
5261                 data->arg.new_lock_owner = 0;
5262         if (!nfs4_valid_open_stateid(state)) {
5263                 data->rpc_status = -EBADF;
5264                 task->tk_action = NULL;
5265                 goto out_release_open_seqid;
5266         }
5267         data->timestamp = jiffies;
5268         if (nfs4_setup_sequence(data->server,
5269                                 &data->arg.seq_args,
5270                                 &data->res.seq_res,
5271                                 task) == 0)
5272                 return;
5273 out_release_open_seqid:
5274         nfs_release_seqid(data->arg.open_seqid);
5275 out_release_lock_seqid:
5276         nfs_release_seqid(data->arg.lock_seqid);
5277 out_wait:
5278         nfs4_sequence_done(task, &data->res.seq_res);
5279         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5280 }
5281
5282 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5283 {
5284         struct nfs4_lockdata *data = calldata;
5285
5286         dprintk("%s: begin!\n", __func__);
5287
5288         if (!nfs4_sequence_done(task, &data->res.seq_res))
5289                 return;
5290
5291         data->rpc_status = task->tk_status;
5292         if (data->arg.new_lock_owner != 0) {
5293                 if (data->rpc_status == 0)
5294                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5295                 else
5296                         goto out;
5297         }
5298         if (data->rpc_status == 0) {
5299                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5300                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5301                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5302         }
5303 out:
5304         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5305 }
5306
5307 static void nfs4_lock_release(void *calldata)
5308 {
5309         struct nfs4_lockdata *data = calldata;
5310
5311         dprintk("%s: begin!\n", __func__);
5312         nfs_free_seqid(data->arg.open_seqid);
5313         if (data->cancelled != 0) {
5314                 struct rpc_task *task;
5315                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5316                                 data->arg.lock_seqid);
5317                 if (!IS_ERR(task))
5318                         rpc_put_task_async(task);
5319                 dprintk("%s: cancelling lock!\n", __func__);
5320         } else
5321                 nfs_free_seqid(data->arg.lock_seqid);
5322         nfs4_put_lock_state(data->lsp);
5323         put_nfs_open_context(data->ctx);
5324         kfree(data);
5325         dprintk("%s: done!\n", __func__);
5326 }
5327
5328 static const struct rpc_call_ops nfs4_lock_ops = {
5329         .rpc_call_prepare = nfs4_lock_prepare,
5330         .rpc_call_done = nfs4_lock_done,
5331         .rpc_release = nfs4_lock_release,
5332 };
5333
5334 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5335 {
5336         switch (error) {
5337         case -NFS4ERR_ADMIN_REVOKED:
5338         case -NFS4ERR_BAD_STATEID:
5339                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5340                 if (new_lock_owner != 0 ||
5341                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5342                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5343                 break;
5344         case -NFS4ERR_STALE_STATEID:
5345                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5346         case -NFS4ERR_EXPIRED:
5347                 nfs4_schedule_lease_recovery(server->nfs_client);
5348         };
5349 }
5350
5351 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5352 {
5353         struct nfs4_lockdata *data;
5354         struct rpc_task *task;
5355         struct rpc_message msg = {
5356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5357                 .rpc_cred = state->owner->so_cred,
5358         };
5359         struct rpc_task_setup task_setup_data = {
5360                 .rpc_client = NFS_CLIENT(state->inode),
5361                 .rpc_message = &msg,
5362                 .callback_ops = &nfs4_lock_ops,
5363                 .workqueue = nfsiod_workqueue,
5364                 .flags = RPC_TASK_ASYNC,
5365         };
5366         int ret;
5367
5368         dprintk("%s: begin!\n", __func__);
5369         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5370                         fl->fl_u.nfs4_fl.owner,
5371                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5372         if (data == NULL)
5373                 return -ENOMEM;
5374         if (IS_SETLKW(cmd))
5375                 data->arg.block = 1;
5376         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5377         msg.rpc_argp = &data->arg;
5378         msg.rpc_resp = &data->res;
5379         task_setup_data.callback_data = data;
5380         if (recovery_type > NFS_LOCK_NEW) {
5381                 if (recovery_type == NFS_LOCK_RECLAIM)
5382                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5383                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5384         }
5385         task = rpc_run_task(&task_setup_data);
5386         if (IS_ERR(task))
5387                 return PTR_ERR(task);
5388         ret = nfs4_wait_for_completion_rpc_task(task);
5389         if (ret == 0) {
5390                 ret = data->rpc_status;
5391                 if (ret)
5392                         nfs4_handle_setlk_error(data->server, data->lsp,
5393                                         data->arg.new_lock_owner, ret);
5394         } else
5395                 data->cancelled = 1;
5396         rpc_put_task(task);
5397         dprintk("%s: done, ret = %d!\n", __func__, ret);
5398         return ret;
5399 }
5400
5401 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5402 {
5403         struct nfs_server *server = NFS_SERVER(state->inode);
5404         struct nfs4_exception exception = {
5405                 .inode = state->inode,
5406         };
5407         int err;
5408
5409         do {
5410                 /* Cache the lock if possible... */
5411                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5412                         return 0;
5413                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5414                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5415                 if (err != -NFS4ERR_DELAY)
5416                         break;
5417                 nfs4_handle_exception(server, err, &exception);
5418         } while (exception.retry);
5419         return err;
5420 }
5421
5422 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5423 {
5424         struct nfs_server *server = NFS_SERVER(state->inode);
5425         struct nfs4_exception exception = {
5426                 .inode = state->inode,
5427         };
5428         int err;
5429
5430         err = nfs4_set_lock_state(state, request);
5431         if (err != 0)
5432                 return err;
5433         do {
5434                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5435                         return 0;
5436                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5437                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5438                 switch (err) {
5439                 default:
5440                         goto out;
5441                 case -NFS4ERR_GRACE:
5442                 case -NFS4ERR_DELAY:
5443                         nfs4_handle_exception(server, err, &exception);
5444                         err = 0;
5445                 }
5446         } while (exception.retry);
5447 out:
5448         return err;
5449 }
5450
5451 #if defined(CONFIG_NFS_V4_1)
5452 /**
5453  * nfs41_check_expired_locks - possibly free a lock stateid
5454  *
5455  * @state: NFSv4 state for an inode
5456  *
5457  * Returns NFS_OK if recovery for this stateid is now finished.
5458  * Otherwise a negative NFS4ERR value is returned.
5459  */
5460 static int nfs41_check_expired_locks(struct nfs4_state *state)
5461 {
5462         int status, ret = -NFS4ERR_BAD_STATEID;
5463         struct nfs4_lock_state *lsp;
5464         struct nfs_server *server = NFS_SERVER(state->inode);
5465
5466         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5467                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5468                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5469
5470                         status = nfs41_test_stateid(server,
5471                                         &lsp->ls_stateid,
5472                                         cred);
5473                         if (status != NFS_OK) {
5474                                 /* Free the stateid unless the server
5475                                  * informs us the stateid is unrecognized. */
5476                                 if (status != -NFS4ERR_BAD_STATEID)
5477                                         nfs41_free_stateid(server,
5478                                                         &lsp->ls_stateid,
5479                                                         cred);
5480                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5481                                 ret = status;
5482                         }
5483                 }
5484         };
5485
5486         return ret;
5487 }
5488
5489 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5490 {
5491         int status = NFS_OK;
5492
5493         if (test_bit(LK_STATE_IN_USE, &state->flags))
5494                 status = nfs41_check_expired_locks(state);
5495         if (status != NFS_OK)
5496                 status = nfs4_lock_expired(state, request);
5497         return status;
5498 }
5499 #endif
5500
5501 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5502 {
5503         struct nfs4_state_owner *sp = state->owner;
5504         struct nfs_inode *nfsi = NFS_I(state->inode);
5505         unsigned char fl_flags = request->fl_flags;
5506         unsigned int seq;
5507         int status = -ENOLCK;
5508
5509         if ((fl_flags & FL_POSIX) &&
5510                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5511                 goto out;
5512         /* Is this a delegated open? */
5513         status = nfs4_set_lock_state(state, request);
5514         if (status != 0)
5515                 goto out;
5516         request->fl_flags |= FL_ACCESS;
5517         status = do_vfs_lock(request->fl_file, request);
5518         if (status < 0)
5519                 goto out;
5520         down_read(&nfsi->rwsem);
5521         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5522                 /* Yes: cache locks! */
5523                 /* ...but avoid races with delegation recall... */
5524                 request->fl_flags = fl_flags & ~FL_SLEEP;
5525                 status = do_vfs_lock(request->fl_file, request);
5526                 goto out_unlock;
5527         }
5528         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5529         up_read(&nfsi->rwsem);
5530         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5531         if (status != 0)
5532                 goto out;
5533         down_read(&nfsi->rwsem);
5534         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5535                 status = -NFS4ERR_DELAY;
5536                 goto out_unlock;
5537         }
5538         /* Note: we always want to sleep here! */
5539         request->fl_flags = fl_flags | FL_SLEEP;
5540         if (do_vfs_lock(request->fl_file, request) < 0)
5541                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5542                         "manager!\n", __func__);
5543 out_unlock:
5544         up_read(&nfsi->rwsem);
5545 out:
5546         request->fl_flags = fl_flags;
5547         return status;
5548 }
5549
5550 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5551 {
5552         struct nfs4_exception exception = {
5553                 .state = state,
5554                 .inode = state->inode,
5555         };
5556         int err;
5557
5558         do {
5559                 err = _nfs4_proc_setlk(state, cmd, request);
5560                 trace_nfs4_set_lock(request, state, cmd, err);
5561                 if (err == -NFS4ERR_DENIED)
5562                         err = -EAGAIN;
5563                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5564                                 err, &exception);
5565         } while (exception.retry);
5566         return err;
5567 }
5568
5569 static int
5570 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5571 {
5572         struct nfs_open_context *ctx;
5573         struct nfs4_state *state;
5574         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5575         int status;
5576
5577         /* verify open state */
5578         ctx = nfs_file_open_context(filp);
5579         state = ctx->state;
5580
5581         if (request->fl_start < 0 || request->fl_end < 0)
5582                 return -EINVAL;
5583
5584         if (IS_GETLK(cmd)) {
5585                 if (state != NULL)
5586                         return nfs4_proc_getlk(state, F_GETLK, request);
5587                 return 0;
5588         }
5589
5590         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5591                 return -EINVAL;
5592
5593         if (request->fl_type == F_UNLCK) {
5594                 if (state != NULL)
5595                         return nfs4_proc_unlck(state, cmd, request);
5596                 return 0;
5597         }
5598
5599         if (state == NULL)
5600                 return -ENOLCK;
5601         /*
5602          * Don't rely on the VFS having checked the file open mode,
5603          * since it won't do this for flock() locks.
5604          */
5605         switch (request->fl_type) {
5606         case F_RDLCK:
5607                 if (!(filp->f_mode & FMODE_READ))
5608                         return -EBADF;
5609                 break;
5610         case F_WRLCK:
5611                 if (!(filp->f_mode & FMODE_WRITE))
5612                         return -EBADF;
5613         }
5614
5615         do {
5616                 status = nfs4_proc_setlk(state, cmd, request);
5617                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5618                         break;
5619                 timeout = nfs4_set_lock_task_retry(timeout);
5620                 status = -ERESTARTSYS;
5621                 if (signalled())
5622                         break;
5623         } while(status < 0);
5624         return status;
5625 }
5626
5627 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5628 {
5629         struct nfs_server *server = NFS_SERVER(state->inode);
5630         int err;
5631
5632         err = nfs4_set_lock_state(state, fl);
5633         if (err != 0)
5634                 return err;
5635         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5636         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5637 }
5638
5639 struct nfs_release_lockowner_data {
5640         struct nfs4_lock_state *lsp;
5641         struct nfs_server *server;
5642         struct nfs_release_lockowner_args args;
5643 };
5644
5645 static void nfs4_release_lockowner_release(void *calldata)
5646 {
5647         struct nfs_release_lockowner_data *data = calldata;
5648         nfs4_free_lock_state(data->server, data->lsp);
5649         kfree(calldata);
5650 }
5651
5652 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5653         .rpc_release = nfs4_release_lockowner_release,
5654 };
5655
5656 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5657 {
5658         struct nfs_release_lockowner_data *data;
5659         struct rpc_message msg = {
5660                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5661         };
5662
5663         if (server->nfs_client->cl_mvops->minor_version != 0)
5664                 return -EINVAL;
5665         data = kmalloc(sizeof(*data), GFP_NOFS);
5666         if (!data)
5667                 return -ENOMEM;
5668         data->lsp = lsp;
5669         data->server = server;
5670         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5671         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5672         data->args.lock_owner.s_dev = server->s_dev;
5673         msg.rpc_argp = &data->args;
5674         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5675         return 0;
5676 }
5677
5678 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5679
5680 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5681                                    const void *buf, size_t buflen,
5682                                    int flags, int type)
5683 {
5684         if (strcmp(key, "") != 0)
5685                 return -EINVAL;
5686
5687         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5688 }
5689
5690 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5691                                    void *buf, size_t buflen, int type)
5692 {
5693         if (strcmp(key, "") != 0)
5694                 return -EINVAL;
5695
5696         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5697 }
5698
5699 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5700                                        size_t list_len, const char *name,
5701                                        size_t name_len, int type)
5702 {
5703         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5704
5705         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5706                 return 0;
5707
5708         if (list && len <= list_len)
5709                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5710         return len;
5711 }
5712
5713 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5714 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5715 {
5716         return server->caps & NFS_CAP_SECURITY_LABEL;
5717 }
5718
5719 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5720                                    const void *buf, size_t buflen,
5721                                    int flags, int type)
5722 {
5723         if (security_ismaclabel(key))
5724                 return nfs4_set_security_label(dentry, buf, buflen);
5725
5726         return -EOPNOTSUPP;
5727 }
5728
5729 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5730                                    void *buf, size_t buflen, int type)
5731 {
5732         if (security_ismaclabel(key))
5733                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5734         return -EOPNOTSUPP;
5735 }
5736
5737 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5738                                        size_t list_len, const char *name,
5739                                        size_t name_len, int type)
5740 {
5741         size_t len = 0;
5742
5743         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5744                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5745                 if (list && len <= list_len)
5746                         security_inode_listsecurity(dentry->d_inode, list, len);
5747         }
5748         return len;
5749 }
5750
5751 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5752         .prefix = XATTR_SECURITY_PREFIX,
5753         .list   = nfs4_xattr_list_nfs4_label,
5754         .get    = nfs4_xattr_get_nfs4_label,
5755         .set    = nfs4_xattr_set_nfs4_label,
5756 };
5757 #endif
5758
5759
5760 /*
5761  * nfs_fhget will use either the mounted_on_fileid or the fileid
5762  */
5763 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5764 {
5765         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5766                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5767               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5768               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5769                 return;
5770
5771         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5772                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5773         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5774         fattr->nlink = 2;
5775 }
5776
5777 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5778                                    const struct qstr *name,
5779                                    struct nfs4_fs_locations *fs_locations,
5780                                    struct page *page)
5781 {
5782         struct nfs_server *server = NFS_SERVER(dir);
5783         u32 bitmask[3] = {
5784                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5785         };
5786         struct nfs4_fs_locations_arg args = {
5787                 .dir_fh = NFS_FH(dir),
5788                 .name = name,
5789                 .page = page,
5790                 .bitmask = bitmask,
5791         };
5792         struct nfs4_fs_locations_res res = {
5793                 .fs_locations = fs_locations,
5794         };
5795         struct rpc_message msg = {
5796                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5797                 .rpc_argp = &args,
5798                 .rpc_resp = &res,
5799         };
5800         int status;
5801
5802         dprintk("%s: start\n", __func__);
5803
5804         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5805          * is not supported */
5806         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5807                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5808         else
5809                 bitmask[0] |= FATTR4_WORD0_FILEID;
5810
5811         nfs_fattr_init(&fs_locations->fattr);
5812         fs_locations->server = server;
5813         fs_locations->nlocations = 0;
5814         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5815         dprintk("%s: returned status = %d\n", __func__, status);
5816         return status;
5817 }
5818
5819 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5820                            const struct qstr *name,
5821                            struct nfs4_fs_locations *fs_locations,
5822                            struct page *page)
5823 {
5824         struct nfs4_exception exception = { };
5825         int err;
5826         do {
5827                 err = _nfs4_proc_fs_locations(client, dir, name,
5828                                 fs_locations, page);
5829                 trace_nfs4_get_fs_locations(dir, name, err);
5830                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5831                                 &exception);
5832         } while (exception.retry);
5833         return err;
5834 }
5835
5836 /**
5837  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
5838  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
5839  */
5840 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5841 {
5842         int status;
5843         struct nfs4_secinfo_arg args = {
5844                 .dir_fh = NFS_FH(dir),
5845                 .name   = name,
5846         };
5847         struct nfs4_secinfo_res res = {
5848                 .flavors     = flavors,
5849         };
5850         struct rpc_message msg = {
5851                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5852                 .rpc_argp = &args,
5853                 .rpc_resp = &res,
5854         };
5855         struct rpc_clnt *clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
5856
5857         dprintk("NFS call  secinfo %s\n", name->name);
5858         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5859         dprintk("NFS reply  secinfo: %d\n", status);
5860         return status;
5861 }
5862
5863 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5864                       struct nfs4_secinfo_flavors *flavors)
5865 {
5866         struct nfs4_exception exception = { };
5867         int err;
5868         do {
5869                 err = _nfs4_proc_secinfo(dir, name, flavors);
5870                 trace_nfs4_secinfo(dir, name, err);
5871                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5872                                 &exception);
5873         } while (exception.retry);
5874         return err;
5875 }
5876
5877 #ifdef CONFIG_NFS_V4_1
5878 /*
5879  * Check the exchange flags returned by the server for invalid flags, having
5880  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5881  * DS flags set.
5882  */
5883 static int nfs4_check_cl_exchange_flags(u32 flags)
5884 {
5885         if (flags & ~EXCHGID4_FLAG_MASK_R)
5886                 goto out_inval;
5887         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5888             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5889                 goto out_inval;
5890         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5891                 goto out_inval;
5892         return NFS_OK;
5893 out_inval:
5894         return -NFS4ERR_INVAL;
5895 }
5896
5897 static bool
5898 nfs41_same_server_scope(struct nfs41_server_scope *a,
5899                         struct nfs41_server_scope *b)
5900 {
5901         if (a->server_scope_sz == b->server_scope_sz &&
5902             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5903                 return true;
5904
5905         return false;
5906 }
5907
5908 /*
5909  * nfs4_proc_bind_conn_to_session()
5910  *
5911  * The 4.1 client currently uses the same TCP connection for the
5912  * fore and backchannel.
5913  */
5914 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5915 {
5916         int status;
5917         struct nfs41_bind_conn_to_session_res res;
5918         struct rpc_message msg = {
5919                 .rpc_proc =
5920                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5921                 .rpc_argp = clp,
5922                 .rpc_resp = &res,
5923                 .rpc_cred = cred,
5924         };
5925
5926         dprintk("--> %s\n", __func__);
5927
5928         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5929         if (unlikely(res.session == NULL)) {
5930                 status = -ENOMEM;
5931                 goto out;
5932         }
5933
5934         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5935         trace_nfs4_bind_conn_to_session(clp, status);
5936         if (status == 0) {
5937                 if (memcmp(res.session->sess_id.data,
5938                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5939                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5940                         status = -EIO;
5941                         goto out_session;
5942                 }
5943                 if (res.dir != NFS4_CDFS4_BOTH) {
5944                         dprintk("NFS: %s: Unexpected direction from server\n",
5945                                 __func__);
5946                         status = -EIO;
5947                         goto out_session;
5948                 }
5949                 if (res.use_conn_in_rdma_mode) {
5950                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5951                                 __func__);
5952                         status = -EIO;
5953                         goto out_session;
5954                 }
5955         }
5956 out_session:
5957         kfree(res.session);
5958 out:
5959         dprintk("<-- %s status= %d\n", __func__, status);
5960         return status;
5961 }
5962
5963 /*
5964  * nfs4_proc_exchange_id()
5965  *
5966  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5967  *
5968  * Since the clientid has expired, all compounds using sessions
5969  * associated with the stale clientid will be returning
5970  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5971  * be in some phase of session reset.
5972  */
5973 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5974 {
5975         nfs4_verifier verifier;
5976         struct nfs41_exchange_id_args args = {
5977                 .verifier = &verifier,
5978                 .client = clp,
5979                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
5980                         EXCHGID4_FLAG_BIND_PRINC_STATEID,
5981         };
5982         struct nfs41_exchange_id_res res = {
5983                 0
5984         };
5985         int status;
5986         struct rpc_message msg = {
5987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5988                 .rpc_argp = &args,
5989                 .rpc_resp = &res,
5990                 .rpc_cred = cred,
5991         };
5992
5993         nfs4_init_boot_verifier(clp, &verifier);
5994         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5995                                                         sizeof(args.id));
5996         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5997                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5998                 args.id_len, args.id);
5999
6000         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6001                                         GFP_NOFS);
6002         if (unlikely(res.server_owner == NULL)) {
6003                 status = -ENOMEM;
6004                 goto out;
6005         }
6006
6007         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6008                                         GFP_NOFS);
6009         if (unlikely(res.server_scope == NULL)) {
6010                 status = -ENOMEM;
6011                 goto out_server_owner;
6012         }
6013
6014         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6015         if (unlikely(res.impl_id == NULL)) {
6016                 status = -ENOMEM;
6017                 goto out_server_scope;
6018         }
6019
6020         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6021         trace_nfs4_exchange_id(clp, status);
6022         if (status == 0)
6023                 status = nfs4_check_cl_exchange_flags(res.flags);
6024
6025         if (status == 0) {
6026                 clp->cl_clientid = res.clientid;
6027                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6028                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6029                         clp->cl_seqid = res.seqid;
6030
6031                 kfree(clp->cl_serverowner);
6032                 clp->cl_serverowner = res.server_owner;
6033                 res.server_owner = NULL;
6034
6035                 /* use the most recent implementation id */
6036                 kfree(clp->cl_implid);
6037                 clp->cl_implid = res.impl_id;
6038
6039                 if (clp->cl_serverscope != NULL &&
6040                     !nfs41_same_server_scope(clp->cl_serverscope,
6041                                              res.server_scope)) {
6042                         dprintk("%s: server_scope mismatch detected\n",
6043                                 __func__);
6044                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6045                         kfree(clp->cl_serverscope);
6046                         clp->cl_serverscope = NULL;
6047                 }
6048
6049                 if (clp->cl_serverscope == NULL) {
6050                         clp->cl_serverscope = res.server_scope;
6051                         goto out;
6052                 }
6053         } else
6054                 kfree(res.impl_id);
6055
6056 out_server_owner:
6057         kfree(res.server_owner);
6058 out_server_scope:
6059         kfree(res.server_scope);
6060 out:
6061         if (clp->cl_implid != NULL)
6062                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6063                         "domain: %s, name: %s, date: %llu,%u\n",
6064                         clp->cl_implid->domain, clp->cl_implid->name,
6065                         clp->cl_implid->date.seconds,
6066                         clp->cl_implid->date.nseconds);
6067         dprintk("NFS reply exchange_id: %d\n", status);
6068         return status;
6069 }
6070
6071 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6072                 struct rpc_cred *cred)
6073 {
6074         struct rpc_message msg = {
6075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6076                 .rpc_argp = clp,
6077                 .rpc_cred = cred,
6078         };
6079         int status;
6080
6081         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6082         trace_nfs4_destroy_clientid(clp, status);
6083         if (status)
6084                 dprintk("NFS: Got error %d from the server %s on "
6085                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6086         return status;
6087 }
6088
6089 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6090                 struct rpc_cred *cred)
6091 {
6092         unsigned int loop;
6093         int ret;
6094
6095         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6096                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6097                 switch (ret) {
6098                 case -NFS4ERR_DELAY:
6099                 case -NFS4ERR_CLIENTID_BUSY:
6100                         ssleep(1);
6101                         break;
6102                 default:
6103                         return ret;
6104                 }
6105         }
6106         return 0;
6107 }
6108
6109 int nfs4_destroy_clientid(struct nfs_client *clp)
6110 {
6111         struct rpc_cred *cred;
6112         int ret = 0;
6113
6114         if (clp->cl_mvops->minor_version < 1)
6115                 goto out;
6116         if (clp->cl_exchange_flags == 0)
6117                 goto out;
6118         if (clp->cl_preserve_clid)
6119                 goto out;
6120         cred = nfs4_get_clid_cred(clp);
6121         ret = nfs4_proc_destroy_clientid(clp, cred);
6122         if (cred)
6123                 put_rpccred(cred);
6124         switch (ret) {
6125         case 0:
6126         case -NFS4ERR_STALE_CLIENTID:
6127                 clp->cl_exchange_flags = 0;
6128         }
6129 out:
6130         return ret;
6131 }
6132
6133 struct nfs4_get_lease_time_data {
6134         struct nfs4_get_lease_time_args *args;
6135         struct nfs4_get_lease_time_res *res;
6136         struct nfs_client *clp;
6137 };
6138
6139 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6140                                         void *calldata)
6141 {
6142         struct nfs4_get_lease_time_data *data =
6143                         (struct nfs4_get_lease_time_data *)calldata;
6144
6145         dprintk("--> %s\n", __func__);
6146         /* just setup sequence, do not trigger session recovery
6147            since we're invoked within one */
6148         nfs41_setup_sequence(data->clp->cl_session,
6149                         &data->args->la_seq_args,
6150                         &data->res->lr_seq_res,
6151                         task);
6152         dprintk("<-- %s\n", __func__);
6153 }
6154
6155 /*
6156  * Called from nfs4_state_manager thread for session setup, so don't recover
6157  * from sequence operation or clientid errors.
6158  */
6159 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6160 {
6161         struct nfs4_get_lease_time_data *data =
6162                         (struct nfs4_get_lease_time_data *)calldata;
6163
6164         dprintk("--> %s\n", __func__);
6165         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6166                 return;
6167         switch (task->tk_status) {
6168         case -NFS4ERR_DELAY:
6169         case -NFS4ERR_GRACE:
6170                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6171                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6172                 task->tk_status = 0;
6173                 /* fall through */
6174         case -NFS4ERR_RETRY_UNCACHED_REP:
6175                 rpc_restart_call_prepare(task);
6176                 return;
6177         }
6178         dprintk("<-- %s\n", __func__);
6179 }
6180
6181 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6182         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6183         .rpc_call_done = nfs4_get_lease_time_done,
6184 };
6185
6186 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6187 {
6188         struct rpc_task *task;
6189         struct nfs4_get_lease_time_args args;
6190         struct nfs4_get_lease_time_res res = {
6191                 .lr_fsinfo = fsinfo,
6192         };
6193         struct nfs4_get_lease_time_data data = {
6194                 .args = &args,
6195                 .res = &res,
6196                 .clp = clp,
6197         };
6198         struct rpc_message msg = {
6199                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6200                 .rpc_argp = &args,
6201                 .rpc_resp = &res,
6202         };
6203         struct rpc_task_setup task_setup = {
6204                 .rpc_client = clp->cl_rpcclient,
6205                 .rpc_message = &msg,
6206                 .callback_ops = &nfs4_get_lease_time_ops,
6207                 .callback_data = &data,
6208                 .flags = RPC_TASK_TIMEOUT,
6209         };
6210         int status;
6211
6212         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6213         nfs4_set_sequence_privileged(&args.la_seq_args);
6214         dprintk("--> %s\n", __func__);
6215         task = rpc_run_task(&task_setup);
6216
6217         if (IS_ERR(task))
6218                 status = PTR_ERR(task);
6219         else {
6220                 status = task->tk_status;
6221                 rpc_put_task(task);
6222         }
6223         dprintk("<-- %s return %d\n", __func__, status);
6224
6225         return status;
6226 }
6227
6228 /*
6229  * Initialize the values to be used by the client in CREATE_SESSION
6230  * If nfs4_init_session set the fore channel request and response sizes,
6231  * use them.
6232  *
6233  * Set the back channel max_resp_sz_cached to zero to force the client to
6234  * always set csa_cachethis to FALSE because the current implementation
6235  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6236  */
6237 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6238 {
6239         unsigned int max_rqst_sz, max_resp_sz;
6240
6241         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6242         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6243
6244         /* Fore channel attributes */
6245         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6246         args->fc_attrs.max_resp_sz = max_resp_sz;
6247         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6248         args->fc_attrs.max_reqs = max_session_slots;
6249
6250         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6251                 "max_ops=%u max_reqs=%u\n",
6252                 __func__,
6253                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6254                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6255
6256         /* Back channel attributes */
6257         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6258         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6259         args->bc_attrs.max_resp_sz_cached = 0;
6260         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6261         args->bc_attrs.max_reqs = 1;
6262
6263         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6264                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6265                 __func__,
6266                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6267                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6268                 args->bc_attrs.max_reqs);
6269 }
6270
6271 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6272 {
6273         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6274         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6275
6276         if (rcvd->max_resp_sz > sent->max_resp_sz)
6277                 return -EINVAL;
6278         /*
6279          * Our requested max_ops is the minimum we need; we're not
6280          * prepared to break up compounds into smaller pieces than that.
6281          * So, no point even trying to continue if the server won't
6282          * cooperate:
6283          */
6284         if (rcvd->max_ops < sent->max_ops)
6285                 return -EINVAL;
6286         if (rcvd->max_reqs == 0)
6287                 return -EINVAL;
6288         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6289                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6290         return 0;
6291 }
6292
6293 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6294 {
6295         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6296         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6297
6298         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6299                 return -EINVAL;
6300         if (rcvd->max_resp_sz < sent->max_resp_sz)
6301                 return -EINVAL;
6302         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6303                 return -EINVAL;
6304         /* These would render the backchannel useless: */
6305         if (rcvd->max_ops != sent->max_ops)
6306                 return -EINVAL;
6307         if (rcvd->max_reqs != sent->max_reqs)
6308                 return -EINVAL;
6309         return 0;
6310 }
6311
6312 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6313                                      struct nfs4_session *session)
6314 {
6315         int ret;
6316
6317         ret = nfs4_verify_fore_channel_attrs(args, session);
6318         if (ret)
6319                 return ret;
6320         return nfs4_verify_back_channel_attrs(args, session);
6321 }
6322
6323 static int _nfs4_proc_create_session(struct nfs_client *clp,
6324                 struct rpc_cred *cred)
6325 {
6326         struct nfs4_session *session = clp->cl_session;
6327         struct nfs41_create_session_args args = {
6328                 .client = clp,
6329                 .cb_program = NFS4_CALLBACK,
6330         };
6331         struct nfs41_create_session_res res = {
6332                 .client = clp,
6333         };
6334         struct rpc_message msg = {
6335                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6336                 .rpc_argp = &args,
6337                 .rpc_resp = &res,
6338                 .rpc_cred = cred,
6339         };
6340         int status;
6341
6342         nfs4_init_channel_attrs(&args);
6343         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6344
6345         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6346         trace_nfs4_create_session(clp, status);
6347
6348         if (!status) {
6349                 /* Verify the session's negotiated channel_attrs values */
6350                 status = nfs4_verify_channel_attrs(&args, session);
6351                 /* Increment the clientid slot sequence id */
6352                 clp->cl_seqid++;
6353         }
6354
6355         return status;
6356 }
6357
6358 /*
6359  * Issues a CREATE_SESSION operation to the server.
6360  * It is the responsibility of the caller to verify the session is
6361  * expired before calling this routine.
6362  */
6363 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6364 {
6365         int status;
6366         unsigned *ptr;
6367         struct nfs4_session *session = clp->cl_session;
6368
6369         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6370
6371         status = _nfs4_proc_create_session(clp, cred);
6372         if (status)
6373                 goto out;
6374
6375         /* Init or reset the session slot tables */
6376         status = nfs4_setup_session_slot_tables(session);
6377         dprintk("slot table setup returned %d\n", status);
6378         if (status)
6379                 goto out;
6380
6381         ptr = (unsigned *)&session->sess_id.data[0];
6382         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6383                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6384 out:
6385         dprintk("<-- %s\n", __func__);
6386         return status;
6387 }
6388
6389 /*
6390  * Issue the over-the-wire RPC DESTROY_SESSION.
6391  * The caller must serialize access to this routine.
6392  */
6393 int nfs4_proc_destroy_session(struct nfs4_session *session,
6394                 struct rpc_cred *cred)
6395 {
6396         struct rpc_message msg = {
6397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6398                 .rpc_argp = session,
6399                 .rpc_cred = cred,
6400         };
6401         int status = 0;
6402
6403         dprintk("--> nfs4_proc_destroy_session\n");
6404
6405         /* session is still being setup */
6406         if (session->clp->cl_cons_state != NFS_CS_READY)
6407                 return status;
6408
6409         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6410         trace_nfs4_destroy_session(session->clp, status);
6411
6412         if (status)
6413                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6414                         "Session has been destroyed regardless...\n", status);
6415
6416         dprintk("<-- nfs4_proc_destroy_session\n");
6417         return status;
6418 }
6419
6420 /*
6421  * Renew the cl_session lease.
6422  */
6423 struct nfs4_sequence_data {
6424         struct nfs_client *clp;
6425         struct nfs4_sequence_args args;
6426         struct nfs4_sequence_res res;
6427 };
6428
6429 static void nfs41_sequence_release(void *data)
6430 {
6431         struct nfs4_sequence_data *calldata = data;
6432         struct nfs_client *clp = calldata->clp;
6433
6434         if (atomic_read(&clp->cl_count) > 1)
6435                 nfs4_schedule_state_renewal(clp);
6436         nfs_put_client(clp);
6437         kfree(calldata);
6438 }
6439
6440 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6441 {
6442         switch(task->tk_status) {
6443         case -NFS4ERR_DELAY:
6444                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6445                 return -EAGAIN;
6446         default:
6447                 nfs4_schedule_lease_recovery(clp);
6448         }
6449         return 0;
6450 }
6451
6452 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6453 {
6454         struct nfs4_sequence_data *calldata = data;
6455         struct nfs_client *clp = calldata->clp;
6456
6457         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6458                 return;
6459
6460         trace_nfs4_sequence(clp, task->tk_status);
6461         if (task->tk_status < 0) {
6462                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6463                 if (atomic_read(&clp->cl_count) == 1)
6464                         goto out;
6465
6466                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6467                         rpc_restart_call_prepare(task);
6468                         return;
6469                 }
6470         }
6471         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6472 out:
6473         dprintk("<-- %s\n", __func__);
6474 }
6475
6476 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6477 {
6478         struct nfs4_sequence_data *calldata = data;
6479         struct nfs_client *clp = calldata->clp;
6480         struct nfs4_sequence_args *args;
6481         struct nfs4_sequence_res *res;
6482
6483         args = task->tk_msg.rpc_argp;
6484         res = task->tk_msg.rpc_resp;
6485
6486         nfs41_setup_sequence(clp->cl_session, args, res, task);
6487 }
6488
6489 static const struct rpc_call_ops nfs41_sequence_ops = {
6490         .rpc_call_done = nfs41_sequence_call_done,
6491         .rpc_call_prepare = nfs41_sequence_prepare,
6492         .rpc_release = nfs41_sequence_release,
6493 };
6494
6495 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6496                 struct rpc_cred *cred,
6497                 bool is_privileged)
6498 {
6499         struct nfs4_sequence_data *calldata;
6500         struct rpc_message msg = {
6501                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6502                 .rpc_cred = cred,
6503         };
6504         struct rpc_task_setup task_setup_data = {
6505                 .rpc_client = clp->cl_rpcclient,
6506                 .rpc_message = &msg,
6507                 .callback_ops = &nfs41_sequence_ops,
6508                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6509         };
6510
6511         if (!atomic_inc_not_zero(&clp->cl_count))
6512                 return ERR_PTR(-EIO);
6513         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6514         if (calldata == NULL) {
6515                 nfs_put_client(clp);
6516                 return ERR_PTR(-ENOMEM);
6517         }
6518         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6519         if (is_privileged)
6520                 nfs4_set_sequence_privileged(&calldata->args);
6521         msg.rpc_argp = &calldata->args;
6522         msg.rpc_resp = &calldata->res;
6523         calldata->clp = clp;
6524         task_setup_data.callback_data = calldata;
6525
6526         return rpc_run_task(&task_setup_data);
6527 }
6528
6529 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6530 {
6531         struct rpc_task *task;
6532         int ret = 0;
6533
6534         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6535                 return 0;
6536         task = _nfs41_proc_sequence(clp, cred, false);
6537         if (IS_ERR(task))
6538                 ret = PTR_ERR(task);
6539         else
6540                 rpc_put_task_async(task);
6541         dprintk("<-- %s status=%d\n", __func__, ret);
6542         return ret;
6543 }
6544
6545 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6546 {
6547         struct rpc_task *task;
6548         int ret;
6549
6550         task = _nfs41_proc_sequence(clp, cred, true);
6551         if (IS_ERR(task)) {
6552                 ret = PTR_ERR(task);
6553                 goto out;
6554         }
6555         ret = rpc_wait_for_completion_task(task);
6556         if (!ret) {
6557                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6558
6559                 if (task->tk_status == 0)
6560                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6561                 ret = task->tk_status;
6562         }
6563         rpc_put_task(task);
6564 out:
6565         dprintk("<-- %s status=%d\n", __func__, ret);
6566         return ret;
6567 }
6568
6569 struct nfs4_reclaim_complete_data {
6570         struct nfs_client *clp;
6571         struct nfs41_reclaim_complete_args arg;
6572         struct nfs41_reclaim_complete_res res;
6573 };
6574
6575 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6576 {
6577         struct nfs4_reclaim_complete_data *calldata = data;
6578
6579         nfs41_setup_sequence(calldata->clp->cl_session,
6580                         &calldata->arg.seq_args,
6581                         &calldata->res.seq_res,
6582                         task);
6583 }
6584
6585 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6586 {
6587         switch(task->tk_status) {
6588         case 0:
6589         case -NFS4ERR_COMPLETE_ALREADY:
6590         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6591                 break;
6592         case -NFS4ERR_DELAY:
6593                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6594                 /* fall through */
6595         case -NFS4ERR_RETRY_UNCACHED_REP:
6596                 return -EAGAIN;
6597         default:
6598                 nfs4_schedule_lease_recovery(clp);
6599         }
6600         return 0;
6601 }
6602
6603 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6604 {
6605         struct nfs4_reclaim_complete_data *calldata = data;
6606         struct nfs_client *clp = calldata->clp;
6607         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6608
6609         dprintk("--> %s\n", __func__);
6610         if (!nfs41_sequence_done(task, res))
6611                 return;
6612
6613         trace_nfs4_reclaim_complete(clp, task->tk_status);
6614         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6615                 rpc_restart_call_prepare(task);
6616                 return;
6617         }
6618         dprintk("<-- %s\n", __func__);
6619 }
6620
6621 static void nfs4_free_reclaim_complete_data(void *data)
6622 {
6623         struct nfs4_reclaim_complete_data *calldata = data;
6624
6625         kfree(calldata);
6626 }
6627
6628 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6629         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6630         .rpc_call_done = nfs4_reclaim_complete_done,
6631         .rpc_release = nfs4_free_reclaim_complete_data,
6632 };
6633
6634 /*
6635  * Issue a global reclaim complete.
6636  */
6637 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
6638                 struct rpc_cred *cred)
6639 {
6640         struct nfs4_reclaim_complete_data *calldata;
6641         struct rpc_task *task;
6642         struct rpc_message msg = {
6643                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6644                 .rpc_cred = cred,
6645         };
6646         struct rpc_task_setup task_setup_data = {
6647                 .rpc_client = clp->cl_rpcclient,
6648                 .rpc_message = &msg,
6649                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6650                 .flags = RPC_TASK_ASYNC,
6651         };
6652         int status = -ENOMEM;
6653
6654         dprintk("--> %s\n", __func__);
6655         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6656         if (calldata == NULL)
6657                 goto out;
6658         calldata->clp = clp;
6659         calldata->arg.one_fs = 0;
6660
6661         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6662         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6663         msg.rpc_argp = &calldata->arg;
6664         msg.rpc_resp = &calldata->res;
6665         task_setup_data.callback_data = calldata;
6666         task = rpc_run_task(&task_setup_data);
6667         if (IS_ERR(task)) {
6668                 status = PTR_ERR(task);
6669                 goto out;
6670         }
6671         status = nfs4_wait_for_completion_rpc_task(task);
6672         if (status == 0)
6673                 status = task->tk_status;
6674         rpc_put_task(task);
6675         return 0;
6676 out:
6677         dprintk("<-- %s status=%d\n", __func__, status);
6678         return status;
6679 }
6680
6681 static void
6682 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6683 {
6684         struct nfs4_layoutget *lgp = calldata;
6685         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6686         struct nfs4_session *session = nfs4_get_session(server);
6687
6688         dprintk("--> %s\n", __func__);
6689         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6690          * right now covering the LAYOUTGET we are about to send.
6691          * However, that is not so catastrophic, and there seems
6692          * to be no way to prevent it completely.
6693          */
6694         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6695                                 &lgp->res.seq_res, task))
6696                 return;
6697         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6698                                           NFS_I(lgp->args.inode)->layout,
6699                                           lgp->args.ctx->state)) {
6700                 rpc_exit(task, NFS4_OK);
6701         }
6702 }
6703
6704 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6705 {
6706         struct nfs4_layoutget *lgp = calldata;
6707         struct inode *inode = lgp->args.inode;
6708         struct nfs_server *server = NFS_SERVER(inode);
6709         struct pnfs_layout_hdr *lo;
6710         struct nfs4_state *state = NULL;
6711         unsigned long timeo, giveup;
6712
6713         dprintk("--> %s\n", __func__);
6714
6715         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6716                 goto out;
6717
6718         switch (task->tk_status) {
6719         case 0:
6720                 goto out;
6721         case -NFS4ERR_LAYOUTTRYLATER:
6722         case -NFS4ERR_RECALLCONFLICT:
6723                 timeo = rpc_get_timeout(task->tk_client);
6724                 giveup = lgp->args.timestamp + timeo;
6725                 if (time_after(giveup, jiffies))
6726                         task->tk_status = -NFS4ERR_DELAY;
6727                 break;
6728         case -NFS4ERR_EXPIRED:
6729         case -NFS4ERR_BAD_STATEID:
6730                 spin_lock(&inode->i_lock);
6731                 lo = NFS_I(inode)->layout;
6732                 if (!lo || list_empty(&lo->plh_segs)) {
6733                         spin_unlock(&inode->i_lock);
6734                         /* If the open stateid was bad, then recover it. */
6735                         state = lgp->args.ctx->state;
6736                 } else {
6737                         LIST_HEAD(head);
6738
6739                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6740                         spin_unlock(&inode->i_lock);
6741                         /* Mark the bad layout state as invalid, then
6742                          * retry using the open stateid. */
6743                         pnfs_free_lseg_list(&head);
6744                 }
6745         }
6746         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6747                 rpc_restart_call_prepare(task);
6748 out:
6749         dprintk("<-- %s\n", __func__);
6750 }
6751
6752 static size_t max_response_pages(struct nfs_server *server)
6753 {
6754         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6755         return nfs_page_array_len(0, max_resp_sz);
6756 }
6757
6758 static void nfs4_free_pages(struct page **pages, size_t size)
6759 {
6760         int i;
6761
6762         if (!pages)
6763                 return;
6764
6765         for (i = 0; i < size; i++) {
6766                 if (!pages[i])
6767                         break;
6768                 __free_page(pages[i]);
6769         }
6770         kfree(pages);
6771 }
6772
6773 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6774 {
6775         struct page **pages;
6776         int i;
6777
6778         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6779         if (!pages) {
6780                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6781                 return NULL;
6782         }
6783
6784         for (i = 0; i < size; i++) {
6785                 pages[i] = alloc_page(gfp_flags);
6786                 if (!pages[i]) {
6787                         dprintk("%s: failed to allocate page\n", __func__);
6788                         nfs4_free_pages(pages, size);
6789                         return NULL;
6790                 }
6791         }
6792
6793         return pages;
6794 }
6795
6796 static void nfs4_layoutget_release(void *calldata)
6797 {
6798         struct nfs4_layoutget *lgp = calldata;
6799         struct inode *inode = lgp->args.inode;
6800         struct nfs_server *server = NFS_SERVER(inode);
6801         size_t max_pages = max_response_pages(server);
6802
6803         dprintk("--> %s\n", __func__);
6804         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6805         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6806         put_nfs_open_context(lgp->args.ctx);
6807         kfree(calldata);
6808         dprintk("<-- %s\n", __func__);
6809 }
6810
6811 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6812         .rpc_call_prepare = nfs4_layoutget_prepare,
6813         .rpc_call_done = nfs4_layoutget_done,
6814         .rpc_release = nfs4_layoutget_release,
6815 };
6816
6817 struct pnfs_layout_segment *
6818 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6819 {
6820         struct inode *inode = lgp->args.inode;
6821         struct nfs_server *server = NFS_SERVER(inode);
6822         size_t max_pages = max_response_pages(server);
6823         struct rpc_task *task;
6824         struct rpc_message msg = {
6825                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6826                 .rpc_argp = &lgp->args,
6827                 .rpc_resp = &lgp->res,
6828                 .rpc_cred = lgp->cred,
6829         };
6830         struct rpc_task_setup task_setup_data = {
6831                 .rpc_client = server->client,
6832                 .rpc_message = &msg,
6833                 .callback_ops = &nfs4_layoutget_call_ops,
6834                 .callback_data = lgp,
6835                 .flags = RPC_TASK_ASYNC,
6836         };
6837         struct pnfs_layout_segment *lseg = NULL;
6838         int status = 0;
6839
6840         dprintk("--> %s\n", __func__);
6841
6842         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6843         if (!lgp->args.layout.pages) {
6844                 nfs4_layoutget_release(lgp);
6845                 return ERR_PTR(-ENOMEM);
6846         }
6847         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6848         lgp->args.timestamp = jiffies;
6849
6850         lgp->res.layoutp = &lgp->args.layout;
6851         lgp->res.seq_res.sr_slot = NULL;
6852         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6853
6854         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6855         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6856
6857         task = rpc_run_task(&task_setup_data);
6858         if (IS_ERR(task))
6859                 return ERR_CAST(task);
6860         status = nfs4_wait_for_completion_rpc_task(task);
6861         if (status == 0)
6862                 status = task->tk_status;
6863         trace_nfs4_layoutget(lgp->args.ctx,
6864                         &lgp->args.range,
6865                         &lgp->res.range,
6866                         status);
6867         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6868         if (status == 0 && lgp->res.layoutp->len)
6869                 lseg = pnfs_layout_process(lgp);
6870         rpc_put_task(task);
6871         dprintk("<-- %s status=%d\n", __func__, status);
6872         if (status)
6873                 return ERR_PTR(status);
6874         return lseg;
6875 }
6876
6877 static void
6878 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6879 {
6880         struct nfs4_layoutreturn *lrp = calldata;
6881
6882         dprintk("--> %s\n", __func__);
6883         nfs41_setup_sequence(lrp->clp->cl_session,
6884                         &lrp->args.seq_args,
6885                         &lrp->res.seq_res,
6886                         task);
6887 }
6888
6889 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6890 {
6891         struct nfs4_layoutreturn *lrp = calldata;
6892         struct nfs_server *server;
6893
6894         dprintk("--> %s\n", __func__);
6895
6896         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6897                 return;
6898
6899         server = NFS_SERVER(lrp->args.inode);
6900         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6901                 rpc_restart_call_prepare(task);
6902                 return;
6903         }
6904         dprintk("<-- %s\n", __func__);
6905 }
6906
6907 static void nfs4_layoutreturn_release(void *calldata)
6908 {
6909         struct nfs4_layoutreturn *lrp = calldata;
6910         struct pnfs_layout_hdr *lo = lrp->args.layout;
6911
6912         dprintk("--> %s\n", __func__);
6913         spin_lock(&lo->plh_inode->i_lock);
6914         if (lrp->res.lrs_present)
6915                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6916         lo->plh_block_lgets--;
6917         spin_unlock(&lo->plh_inode->i_lock);
6918         pnfs_put_layout_hdr(lrp->args.layout);
6919         kfree(calldata);
6920         dprintk("<-- %s\n", __func__);
6921 }
6922
6923 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6924         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6925         .rpc_call_done = nfs4_layoutreturn_done,
6926         .rpc_release = nfs4_layoutreturn_release,
6927 };
6928
6929 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6930 {
6931         struct rpc_task *task;
6932         struct rpc_message msg = {
6933                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6934                 .rpc_argp = &lrp->args,
6935                 .rpc_resp = &lrp->res,
6936                 .rpc_cred = lrp->cred,
6937         };
6938         struct rpc_task_setup task_setup_data = {
6939                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
6940                 .rpc_message = &msg,
6941                 .callback_ops = &nfs4_layoutreturn_call_ops,
6942                 .callback_data = lrp,
6943         };
6944         int status;
6945
6946         dprintk("--> %s\n", __func__);
6947         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6948         task = rpc_run_task(&task_setup_data);
6949         if (IS_ERR(task))
6950                 return PTR_ERR(task);
6951         status = task->tk_status;
6952         trace_nfs4_layoutreturn(lrp->args.inode, status);
6953         dprintk("<-- %s status=%d\n", __func__, status);
6954         rpc_put_task(task);
6955         return status;
6956 }
6957
6958 /*
6959  * Retrieve the list of Data Server devices from the MDS.
6960  */
6961 static int _nfs4_getdevicelist(struct nfs_server *server,
6962                                     const struct nfs_fh *fh,
6963                                     struct pnfs_devicelist *devlist)
6964 {
6965         struct nfs4_getdevicelist_args args = {
6966                 .fh = fh,
6967                 .layoutclass = server->pnfs_curr_ld->id,
6968         };
6969         struct nfs4_getdevicelist_res res = {
6970                 .devlist = devlist,
6971         };
6972         struct rpc_message msg = {
6973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6974                 .rpc_argp = &args,
6975                 .rpc_resp = &res,
6976         };
6977         int status;
6978
6979         dprintk("--> %s\n", __func__);
6980         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6981                                 &res.seq_res, 0);
6982         dprintk("<-- %s status=%d\n", __func__, status);
6983         return status;
6984 }
6985
6986 int nfs4_proc_getdevicelist(struct nfs_server *server,
6987                             const struct nfs_fh *fh,
6988                             struct pnfs_devicelist *devlist)
6989 {
6990         struct nfs4_exception exception = { };
6991         int err;
6992
6993         do {
6994                 err = nfs4_handle_exception(server,
6995                                 _nfs4_getdevicelist(server, fh, devlist),
6996                                 &exception);
6997         } while (exception.retry);
6998
6999         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7000                 err, devlist->num_devs);
7001
7002         return err;
7003 }
7004 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7005
7006 static int
7007 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7008                 struct pnfs_device *pdev,
7009                 struct rpc_cred *cred)
7010 {
7011         struct nfs4_getdeviceinfo_args args = {
7012                 .pdev = pdev,
7013         };
7014         struct nfs4_getdeviceinfo_res res = {
7015                 .pdev = pdev,
7016         };
7017         struct rpc_message msg = {
7018                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7019                 .rpc_argp = &args,
7020                 .rpc_resp = &res,
7021                 .rpc_cred = cred,
7022         };
7023         int status;
7024
7025         dprintk("--> %s\n", __func__);
7026         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7027         dprintk("<-- %s status=%d\n", __func__, status);
7028
7029         return status;
7030 }
7031
7032 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7033                 struct pnfs_device *pdev,
7034                 struct rpc_cred *cred)
7035 {
7036         struct nfs4_exception exception = { };
7037         int err;
7038
7039         do {
7040                 err = nfs4_handle_exception(server,
7041                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7042                                         &exception);
7043         } while (exception.retry);
7044         return err;
7045 }
7046 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7047
7048 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7049 {
7050         struct nfs4_layoutcommit_data *data = calldata;
7051         struct nfs_server *server = NFS_SERVER(data->args.inode);
7052         struct nfs4_session *session = nfs4_get_session(server);
7053
7054         nfs41_setup_sequence(session,
7055                         &data->args.seq_args,
7056                         &data->res.seq_res,
7057                         task);
7058 }
7059
7060 static void
7061 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7062 {
7063         struct nfs4_layoutcommit_data *data = calldata;
7064         struct nfs_server *server = NFS_SERVER(data->args.inode);
7065
7066         if (!nfs41_sequence_done(task, &data->res.seq_res))
7067                 return;
7068
7069         switch (task->tk_status) { /* Just ignore these failures */
7070         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7071         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7072         case -NFS4ERR_BADLAYOUT:     /* no layout */
7073         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7074                 task->tk_status = 0;
7075                 break;
7076         case 0:
7077                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7078                                                    data->res.fattr);
7079                 break;
7080         default:
7081                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7082                         rpc_restart_call_prepare(task);
7083                         return;
7084                 }
7085         }
7086 }
7087
7088 static void nfs4_layoutcommit_release(void *calldata)
7089 {
7090         struct nfs4_layoutcommit_data *data = calldata;
7091
7092         pnfs_cleanup_layoutcommit(data);
7093         put_rpccred(data->cred);
7094         kfree(data);
7095 }
7096
7097 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7098         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7099         .rpc_call_done = nfs4_layoutcommit_done,
7100         .rpc_release = nfs4_layoutcommit_release,
7101 };
7102
7103 int
7104 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7105 {
7106         struct rpc_message msg = {
7107                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7108                 .rpc_argp = &data->args,
7109                 .rpc_resp = &data->res,
7110                 .rpc_cred = data->cred,
7111         };
7112         struct rpc_task_setup task_setup_data = {
7113                 .task = &data->task,
7114                 .rpc_client = NFS_CLIENT(data->args.inode),
7115                 .rpc_message = &msg,
7116                 .callback_ops = &nfs4_layoutcommit_ops,
7117                 .callback_data = data,
7118                 .flags = RPC_TASK_ASYNC,
7119         };
7120         struct rpc_task *task;
7121         int status = 0;
7122
7123         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7124                 "lbw: %llu inode %lu\n",
7125                 data->task.tk_pid, sync,
7126                 data->args.lastbytewritten,
7127                 data->args.inode->i_ino);
7128
7129         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7130         task = rpc_run_task(&task_setup_data);
7131         if (IS_ERR(task))
7132                 return PTR_ERR(task);
7133         if (sync == false)
7134                 goto out;
7135         status = nfs4_wait_for_completion_rpc_task(task);
7136         if (status != 0)
7137                 goto out;
7138         status = task->tk_status;
7139         trace_nfs4_layoutcommit(data->args.inode, status);
7140 out:
7141         dprintk("%s: status %d\n", __func__, status);
7142         rpc_put_task(task);
7143         return status;
7144 }
7145
7146 /**
7147  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7148  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7149  */
7150 static int
7151 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7152                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7153 {
7154         struct nfs41_secinfo_no_name_args args = {
7155                 .style = SECINFO_STYLE_CURRENT_FH,
7156         };
7157         struct nfs4_secinfo_res res = {
7158                 .flavors = flavors,
7159         };
7160         struct rpc_message msg = {
7161                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7162                 .rpc_argp = &args,
7163                 .rpc_resp = &res,
7164         };
7165         return nfs4_call_sync(server->nfs_client->cl_rpcclient, server, &msg,
7166                                 &args.seq_args, &res.seq_res, 0);
7167 }
7168
7169 static int
7170 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7171                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7172 {
7173         struct nfs4_exception exception = { };
7174         int err;
7175         do {
7176                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7177                 switch (err) {
7178                 case 0:
7179                 case -NFS4ERR_WRONGSEC:
7180                 case -NFS4ERR_NOTSUPP:
7181                         goto out;
7182                 default:
7183                         err = nfs4_handle_exception(server, err, &exception);
7184                 }
7185         } while (exception.retry);
7186 out:
7187         return err;
7188 }
7189
7190 static int
7191 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7192                     struct nfs_fsinfo *info)
7193 {
7194         int err;
7195         struct page *page;
7196         rpc_authflavor_t flavor;
7197         struct nfs4_secinfo_flavors *flavors;
7198
7199         page = alloc_page(GFP_KERNEL);
7200         if (!page) {
7201                 err = -ENOMEM;
7202                 goto out;
7203         }
7204
7205         flavors = page_address(page);
7206         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7207
7208         /*
7209          * Fall back on "guess and check" method if
7210          * the server doesn't support SECINFO_NO_NAME
7211          */
7212         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7213                 err = nfs4_find_root_sec(server, fhandle, info);
7214                 goto out_freepage;
7215         }
7216         if (err)
7217                 goto out_freepage;
7218
7219         flavor = nfs_find_best_sec(flavors);
7220         if (err == 0)
7221                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
7222
7223 out_freepage:
7224         put_page(page);
7225         if (err == -EACCES)
7226                 return -EPERM;
7227 out:
7228         return err;
7229 }
7230
7231 static int _nfs41_test_stateid(struct nfs_server *server,
7232                 nfs4_stateid *stateid,
7233                 struct rpc_cred *cred)
7234 {
7235         int status;
7236         struct nfs41_test_stateid_args args = {
7237                 .stateid = stateid,
7238         };
7239         struct nfs41_test_stateid_res res;
7240         struct rpc_message msg = {
7241                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7242                 .rpc_argp = &args,
7243                 .rpc_resp = &res,
7244                 .rpc_cred = cred,
7245         };
7246
7247         dprintk("NFS call  test_stateid %p\n", stateid);
7248         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
7249         nfs4_set_sequence_privileged(&args.seq_args);
7250         status = nfs4_call_sync_sequence(server->client, server, &msg,
7251                         &args.seq_args, &res.seq_res);
7252         if (status != NFS_OK) {
7253                 dprintk("NFS reply test_stateid: failed, %d\n", status);
7254                 return status;
7255         }
7256         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7257         return -res.status;
7258 }
7259
7260 /**
7261  * nfs41_test_stateid - perform a TEST_STATEID operation
7262  *
7263  * @server: server / transport on which to perform the operation
7264  * @stateid: state ID to test
7265  * @cred: credential
7266  *
7267  * Returns NFS_OK if the server recognizes that "stateid" is valid.
7268  * Otherwise a negative NFS4ERR value is returned if the operation
7269  * failed or the state ID is not currently valid.
7270  */
7271 static int nfs41_test_stateid(struct nfs_server *server,
7272                 nfs4_stateid *stateid,
7273                 struct rpc_cred *cred)
7274 {
7275         struct nfs4_exception exception = { };
7276         int err;
7277         do {
7278                 err = _nfs41_test_stateid(server, stateid, cred);
7279                 if (err != -NFS4ERR_DELAY)
7280                         break;
7281                 nfs4_handle_exception(server, err, &exception);
7282         } while (exception.retry);
7283         return err;
7284 }
7285
7286 struct nfs_free_stateid_data {
7287         struct nfs_server *server;
7288         struct nfs41_free_stateid_args args;
7289         struct nfs41_free_stateid_res res;
7290 };
7291
7292 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
7293 {
7294         struct nfs_free_stateid_data *data = calldata;
7295         nfs41_setup_sequence(nfs4_get_session(data->server),
7296                         &data->args.seq_args,
7297                         &data->res.seq_res,
7298                         task);
7299 }
7300
7301 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
7302 {
7303         struct nfs_free_stateid_data *data = calldata;
7304
7305         nfs41_sequence_done(task, &data->res.seq_res);
7306
7307         switch (task->tk_status) {
7308         case -NFS4ERR_DELAY:
7309                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
7310                         rpc_restart_call_prepare(task);
7311         }
7312 }
7313
7314 static void nfs41_free_stateid_release(void *calldata)
7315 {
7316         kfree(calldata);
7317 }
7318
7319 static const struct rpc_call_ops nfs41_free_stateid_ops = {
7320         .rpc_call_prepare = nfs41_free_stateid_prepare,
7321         .rpc_call_done = nfs41_free_stateid_done,
7322         .rpc_release = nfs41_free_stateid_release,
7323 };
7324
7325 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
7326                 nfs4_stateid *stateid,
7327                 struct rpc_cred *cred,
7328                 bool privileged)
7329 {
7330         struct rpc_message msg = {
7331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7332                 .rpc_cred = cred,
7333         };
7334         struct rpc_task_setup task_setup = {
7335                 .rpc_client = server->client,
7336                 .rpc_message = &msg,
7337                 .callback_ops = &nfs41_free_stateid_ops,
7338                 .flags = RPC_TASK_ASYNC,
7339         };
7340         struct nfs_free_stateid_data *data;
7341
7342         dprintk("NFS call  free_stateid %p\n", stateid);
7343         data = kmalloc(sizeof(*data), GFP_NOFS);
7344         if (!data)
7345                 return ERR_PTR(-ENOMEM);
7346         data->server = server;
7347         nfs4_stateid_copy(&data->args.stateid, stateid);
7348
7349         task_setup.callback_data = data;
7350
7351         msg.rpc_argp = &data->args;
7352         msg.rpc_resp = &data->res;
7353         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
7354         if (privileged)
7355                 nfs4_set_sequence_privileged(&data->args.seq_args);
7356
7357         return rpc_run_task(&task_setup);
7358 }
7359
7360 /**
7361  * nfs41_free_stateid - perform a FREE_STATEID operation
7362  *
7363  * @server: server / transport on which to perform the operation
7364  * @stateid: state ID to release
7365  * @cred: credential
7366  *
7367  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7368  * negative NFS4ERR value is returned.
7369  */
7370 static int nfs41_free_stateid(struct nfs_server *server,
7371                 nfs4_stateid *stateid,
7372                 struct rpc_cred *cred)
7373 {
7374         struct rpc_task *task;
7375         int ret;
7376
7377         task = _nfs41_free_stateid(server, stateid, cred, true);
7378         if (IS_ERR(task))
7379                 return PTR_ERR(task);
7380         ret = rpc_wait_for_completion_task(task);
7381         if (!ret)
7382                 ret = task->tk_status;
7383         rpc_put_task(task);
7384         return ret;
7385 }
7386
7387 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
7388 {
7389         struct rpc_task *task;
7390         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
7391
7392         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
7393         nfs4_free_lock_state(server, lsp);
7394         if (IS_ERR(task))
7395                 return PTR_ERR(task);
7396         rpc_put_task(task);
7397         return 0;
7398 }
7399
7400 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7401                 const nfs4_stateid *s2)
7402 {
7403         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7404                 return false;
7405
7406         if (s1->seqid == s2->seqid)
7407                 return true;
7408         if (s1->seqid == 0 || s2->seqid == 0)
7409                 return true;
7410
7411         return false;
7412 }
7413
7414 #endif /* CONFIG_NFS_V4_1 */
7415
7416 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7417                 const nfs4_stateid *s2)
7418 {
7419         return nfs4_stateid_match(s1, s2);
7420 }
7421
7422
7423 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7424         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7425         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7426         .recover_open   = nfs4_open_reclaim,
7427         .recover_lock   = nfs4_lock_reclaim,
7428         .establish_clid = nfs4_init_clientid,
7429         .detect_trunking = nfs40_discover_server_trunking,
7430 };
7431
7432 #if defined(CONFIG_NFS_V4_1)
7433 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7434         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7435         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7436         .recover_open   = nfs4_open_reclaim,
7437         .recover_lock   = nfs4_lock_reclaim,
7438         .establish_clid = nfs41_init_clientid,
7439         .reclaim_complete = nfs41_proc_reclaim_complete,
7440         .detect_trunking = nfs41_discover_server_trunking,
7441 };
7442 #endif /* CONFIG_NFS_V4_1 */
7443
7444 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7445         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7446         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7447         .recover_open   = nfs4_open_expired,
7448         .recover_lock   = nfs4_lock_expired,
7449         .establish_clid = nfs4_init_clientid,
7450 };
7451
7452 #if defined(CONFIG_NFS_V4_1)
7453 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7454         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7455         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7456         .recover_open   = nfs41_open_expired,
7457         .recover_lock   = nfs41_lock_expired,
7458         .establish_clid = nfs41_init_clientid,
7459 };
7460 #endif /* CONFIG_NFS_V4_1 */
7461
7462 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7463         .sched_state_renewal = nfs4_proc_async_renew,
7464         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7465         .renew_lease = nfs4_proc_renew,
7466 };
7467
7468 #if defined(CONFIG_NFS_V4_1)
7469 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7470         .sched_state_renewal = nfs41_proc_async_sequence,
7471         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7472         .renew_lease = nfs4_proc_sequence,
7473 };
7474 #endif
7475
7476 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7477         .minor_version = 0,
7478         .init_caps = NFS_CAP_READDIRPLUS
7479                 | NFS_CAP_ATOMIC_OPEN
7480                 | NFS_CAP_CHANGE_ATTR
7481                 | NFS_CAP_POSIX_LOCK,
7482         .call_sync = _nfs4_call_sync,
7483         .match_stateid = nfs4_match_stateid,
7484         .find_root_sec = nfs4_find_root_sec,
7485         .free_lock_state = nfs4_release_lockowner,
7486         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7487         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7488         .state_renewal_ops = &nfs40_state_renewal_ops,
7489 };
7490
7491 #if defined(CONFIG_NFS_V4_1)
7492 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7493         .minor_version = 1,
7494         .init_caps = NFS_CAP_READDIRPLUS
7495                 | NFS_CAP_ATOMIC_OPEN
7496                 | NFS_CAP_CHANGE_ATTR
7497                 | NFS_CAP_POSIX_LOCK
7498                 | NFS_CAP_STATEID_NFSV41
7499                 | NFS_CAP_ATOMIC_OPEN_V1,
7500         .call_sync = nfs4_call_sync_sequence,
7501         .match_stateid = nfs41_match_stateid,
7502         .find_root_sec = nfs41_find_root_sec,
7503         .free_lock_state = nfs41_free_lock_state,
7504         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7505         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7506         .state_renewal_ops = &nfs41_state_renewal_ops,
7507 };
7508 #endif
7509
7510 #if defined(CONFIG_NFS_V4_2)
7511 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
7512         .minor_version = 2,
7513         .init_caps = NFS_CAP_READDIRPLUS
7514                 | NFS_CAP_ATOMIC_OPEN
7515                 | NFS_CAP_CHANGE_ATTR
7516                 | NFS_CAP_POSIX_LOCK
7517                 | NFS_CAP_STATEID_NFSV41
7518                 | NFS_CAP_ATOMIC_OPEN_V1,
7519         .call_sync = nfs4_call_sync_sequence,
7520         .match_stateid = nfs41_match_stateid,
7521         .find_root_sec = nfs41_find_root_sec,
7522         .free_lock_state = nfs41_free_lock_state,
7523         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7524         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7525         .state_renewal_ops = &nfs41_state_renewal_ops,
7526 };
7527 #endif
7528
7529 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7530         [0] = &nfs_v4_0_minor_ops,
7531 #if defined(CONFIG_NFS_V4_1)
7532         [1] = &nfs_v4_1_minor_ops,
7533 #endif
7534 #if defined(CONFIG_NFS_V4_2)
7535         [2] = &nfs_v4_2_minor_ops,
7536 #endif
7537 };
7538
7539 static const struct inode_operations nfs4_dir_inode_operations = {
7540         .create         = nfs_create,
7541         .lookup         = nfs_lookup,
7542         .atomic_open    = nfs_atomic_open,
7543         .link           = nfs_link,
7544         .unlink         = nfs_unlink,
7545         .symlink        = nfs_symlink,
7546         .mkdir          = nfs_mkdir,
7547         .rmdir          = nfs_rmdir,
7548         .mknod          = nfs_mknod,
7549         .rename         = nfs_rename,
7550         .permission     = nfs_permission,
7551         .getattr        = nfs_getattr,
7552         .setattr        = nfs_setattr,
7553         .getxattr       = generic_getxattr,
7554         .setxattr       = generic_setxattr,
7555         .listxattr      = generic_listxattr,
7556         .removexattr    = generic_removexattr,
7557 };
7558
7559 static const struct inode_operations nfs4_file_inode_operations = {
7560         .permission     = nfs_permission,
7561         .getattr        = nfs_getattr,
7562         .setattr        = nfs_setattr,
7563         .getxattr       = generic_getxattr,
7564         .setxattr       = generic_setxattr,
7565         .listxattr      = generic_listxattr,
7566         .removexattr    = generic_removexattr,
7567 };
7568
7569 const struct nfs_rpc_ops nfs_v4_clientops = {
7570         .version        = 4,                    /* protocol version */
7571         .dentry_ops     = &nfs4_dentry_operations,
7572         .dir_inode_ops  = &nfs4_dir_inode_operations,
7573         .file_inode_ops = &nfs4_file_inode_operations,
7574         .file_ops       = &nfs4_file_operations,
7575         .getroot        = nfs4_proc_get_root,
7576         .submount       = nfs4_submount,
7577         .try_mount      = nfs4_try_mount,
7578         .getattr        = nfs4_proc_getattr,
7579         .setattr        = nfs4_proc_setattr,
7580         .lookup         = nfs4_proc_lookup,
7581         .access         = nfs4_proc_access,
7582         .readlink       = nfs4_proc_readlink,
7583         .create         = nfs4_proc_create,
7584         .remove         = nfs4_proc_remove,
7585         .unlink_setup   = nfs4_proc_unlink_setup,
7586         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7587         .unlink_done    = nfs4_proc_unlink_done,
7588         .rename         = nfs4_proc_rename,
7589         .rename_setup   = nfs4_proc_rename_setup,
7590         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7591         .rename_done    = nfs4_proc_rename_done,
7592         .link           = nfs4_proc_link,
7593         .symlink        = nfs4_proc_symlink,
7594         .mkdir          = nfs4_proc_mkdir,
7595         .rmdir          = nfs4_proc_remove,
7596         .readdir        = nfs4_proc_readdir,
7597         .mknod          = nfs4_proc_mknod,
7598         .statfs         = nfs4_proc_statfs,
7599         .fsinfo         = nfs4_proc_fsinfo,
7600         .pathconf       = nfs4_proc_pathconf,
7601         .set_capabilities = nfs4_server_capabilities,
7602         .decode_dirent  = nfs4_decode_dirent,
7603         .read_setup     = nfs4_proc_read_setup,
7604         .read_pageio_init = pnfs_pageio_init_read,
7605         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7606         .read_done      = nfs4_read_done,
7607         .write_setup    = nfs4_proc_write_setup,
7608         .write_pageio_init = pnfs_pageio_init_write,
7609         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7610         .write_done     = nfs4_write_done,
7611         .commit_setup   = nfs4_proc_commit_setup,
7612         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7613         .commit_done    = nfs4_commit_done,
7614         .lock           = nfs4_proc_lock,
7615         .clear_acl_cache = nfs4_zap_acl_attr,
7616         .close_context  = nfs4_close_context,
7617         .open_context   = nfs4_atomic_open,
7618         .have_delegation = nfs4_have_delegation,
7619         .return_delegation = nfs4_inode_return_delegation,
7620         .alloc_client   = nfs4_alloc_client,
7621         .init_client    = nfs4_init_client,
7622         .free_client    = nfs4_free_client,
7623         .create_server  = nfs4_create_server,
7624         .clone_server   = nfs_clone_server,
7625 };
7626
7627 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7628         .prefix = XATTR_NAME_NFSV4_ACL,
7629         .list   = nfs4_xattr_list_nfs4_acl,
7630         .get    = nfs4_xattr_get_nfs4_acl,
7631         .set    = nfs4_xattr_set_nfs4_acl,
7632 };
7633
7634 const struct xattr_handler *nfs4_xattr_handlers[] = {
7635         &nfs4_xattr_nfs4_acl_handler,
7636 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7637         &nfs4_xattr_nfs4_label_handler,
7638 #endif
7639         NULL
7640 };
7641
7642 /*
7643  * Local variables:
7644  *  c-basic-offset: 8
7645  * End:
7646  */