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 <[email protected]>
  10  *  Andy Adamson   <[email protected]>
  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/file.h>
  42 #include <linux/string.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/printk.h>
  45 #include <linux/slab.h>
  46 #include <linux/sunrpc/clnt.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/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 "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69
  70 #include "nfs4trace.h"
  71
  72 #define NFSDBG_FACILITY         NFSDBG_PROC
  73
  74 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  75 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  76
  77 struct nfs4_opendata;
  78 static int _nfs4_proc_open(struct nfs4_opendata *data);
  79 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  80 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  81 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
  82 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  83 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  84 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  85 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  86                             struct nfs_fattr *fattr, struct iattr *sattr,
  87                             struct nfs4_state *state, struct nfs4_label *ilabel,
  88                             struct nfs4_label *olabel);
  89 #ifdef CONFIG_NFS_V4_1
  90 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  91                 struct rpc_cred *);
  92 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  93                 struct rpc_cred *);
  94 #endif
  95
  96 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  97 static inline struct nfs4_label *
  98 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  99         struct iattr *sattr, struct nfs4_label *label)
 100 {
 101         int err;
 102
 103         if (label == NULL)
 104                 return NULL;
 105
 106         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 107                 return NULL;
 108
 109         err = security_dentry_init_security(dentry, sattr->ia_mode,
 110                                 &dentry->d_name, (void **)&label->label, &label->len);
 111         if (err == 0)
 112                 return label;
 113
 114         return NULL;
 115 }
 116 static inline void
 117 nfs4_label_release_security(struct nfs4_label *label)
 118 {
 119         if (label)
 120                 security_release_secctx(label->label, label->len);
 121 }
 122 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 123 {
 124         if (label)
 125                 return server->attr_bitmask;
 126
 127         return server->attr_bitmask_nl;
 128 }
 129 #else
 130 static inline struct nfs4_label *
 131 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 132         struct iattr *sattr, struct nfs4_label *l)
 133 { return NULL; }
 134 static inline void
 135 nfs4_label_release_security(struct nfs4_label *label)
 136 { return; }
 137 static inline u32 *
 138 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 139 { return server->attr_bitmask; }
 140 #endif
 141
 142 /* Prevent leaks of NFSv4 errors into userland */
 143 static int nfs4_map_errors(int err)
 144 {
 145         if (err >= -1000)
 146                 return err;
 147         switch (err) {
 148         case -NFS4ERR_RESOURCE:
 149         case -NFS4ERR_LAYOUTTRYLATER:
 150         case -NFS4ERR_RECALLCONFLICT:
 151                 return -EREMOTEIO;
 152         case -NFS4ERR_WRONGSEC:
 153         case -NFS4ERR_WRONG_CRED:
 154                 return -EPERM;
 155         case -NFS4ERR_BADOWNER:
 156         case -NFS4ERR_BADNAME:
 157                 return -EINVAL;
 158         case -NFS4ERR_SHARE_DENIED:
 159                 return -EACCES;
 160         case -NFS4ERR_MINOR_VERS_MISMATCH:
 161                 return -EPROTONOSUPPORT;
 162         case -NFS4ERR_FILE_OPEN:
 163                 return -EBUSY;
 164         default:
 165                 dprintk("%s could not handle NFSv4 error %d\n",
 166                                 __func__, -err);
 167                 break;
 168         }
 169         return -EIO;
 170 }
 171
 172 /*
 173  * This is our standard bitmap for GETATTR requests.
 174  */
 175 const u32 nfs4_fattr_bitmap[3] = {
 176         FATTR4_WORD0_TYPE
 177         | FATTR4_WORD0_CHANGE
 178         | FATTR4_WORD0_SIZE
 179         | FATTR4_WORD0_FSID
 180         | FATTR4_WORD0_FILEID,
 181         FATTR4_WORD1_MODE
 182         | FATTR4_WORD1_NUMLINKS
 183         | FATTR4_WORD1_OWNER
 184         | FATTR4_WORD1_OWNER_GROUP
 185         | FATTR4_WORD1_RAWDEV
 186         | FATTR4_WORD1_SPACE_USED
 187         | FATTR4_WORD1_TIME_ACCESS
 188         | FATTR4_WORD1_TIME_METADATA
 189         | FATTR4_WORD1_TIME_MODIFY
 190         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 192         FATTR4_WORD2_SECURITY_LABEL
 193 #endif
 194 };
 195
 196 static const u32 nfs4_pnfs_open_bitmap[3] = {
 197         FATTR4_WORD0_TYPE
 198         | FATTR4_WORD0_CHANGE
 199         | FATTR4_WORD0_SIZE
 200         | FATTR4_WORD0_FSID
 201         | FATTR4_WORD0_FILEID,
 202         FATTR4_WORD1_MODE
 203         | FATTR4_WORD1_NUMLINKS
 204         | FATTR4_WORD1_OWNER
 205         | FATTR4_WORD1_OWNER_GROUP
 206         | FATTR4_WORD1_RAWDEV
 207         | FATTR4_WORD1_SPACE_USED
 208         | FATTR4_WORD1_TIME_ACCESS
 209         | FATTR4_WORD1_TIME_METADATA
 210         | FATTR4_WORD1_TIME_MODIFY,
 211         FATTR4_WORD2_MDSTHRESHOLD
 212 };
 213
 214 static const u32 nfs4_open_noattr_bitmap[3] = {
 215         FATTR4_WORD0_TYPE
 216         | FATTR4_WORD0_CHANGE
 217         | FATTR4_WORD0_FILEID,
 218 };
 219
 220 const u32 nfs4_statfs_bitmap[3] = {
 221         FATTR4_WORD0_FILES_AVAIL
 222         | FATTR4_WORD0_FILES_FREE
 223         | FATTR4_WORD0_FILES_TOTAL,
 224         FATTR4_WORD1_SPACE_AVAIL
 225         | FATTR4_WORD1_SPACE_FREE
 226         | FATTR4_WORD1_SPACE_TOTAL
 227 };
 228
 229 const u32 nfs4_pathconf_bitmap[3] = {
 230         FATTR4_WORD0_MAXLINK
 231         | FATTR4_WORD0_MAXNAME,
 232         0
 233 };
 234
 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 236                         | FATTR4_WORD0_MAXREAD
 237                         | FATTR4_WORD0_MAXWRITE
 238                         | FATTR4_WORD0_LEASE_TIME,
 239                         FATTR4_WORD1_TIME_DELTA
 240                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 241                         FATTR4_WORD2_LAYOUT_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static long nfs4_update_delay(long *timeout)
 318 {
 319         long ret;
 320         if (!timeout)
 321                 return NFS4_POLL_RETRY_MAX;
 322         if (*timeout <= 0)
 323                 *timeout = NFS4_POLL_RETRY_MIN;
 324         if (*timeout > NFS4_POLL_RETRY_MAX)
 325                 *timeout = NFS4_POLL_RETRY_MAX;
 326         ret = *timeout;
 327         *timeout <<= 1;
 328         return ret;
 329 }
 330
 331 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 332 {
 333         int res = 0;
 334
 335         might_sleep();
 336
 337         freezable_schedule_timeout_killable_unsafe(
 338                 nfs4_update_delay(timeout));
 339         if (fatal_signal_pending(current))
 340                 res = -ERESTARTSYS;
 341         return res;
 342 }
 343
 344 /* This is the error handling routine for processes that are allowed
 345  * to sleep.
 346  */
 347 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 348 {
 349         struct nfs_client *clp = server->nfs_client;
 350         struct nfs4_state *state = exception->state;
 351         struct inode *inode = exception->inode;
 352         int ret = errorcode;
 353
 354         exception->retry = 0;
 355         switch(errorcode) {
 356                 case 0:
 357                         return 0;
 358                 case -NFS4ERR_OPENMODE:
 359                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 360                                 nfs4_inode_return_delegation(inode);
 361                                 exception->retry = 1;
 362                                 return 0;
 363                         }
 364                         if (state == NULL)
 365                                 break;
 366                         ret = nfs4_schedule_stateid_recovery(server, state);
 367                         if (ret < 0)
 368                                 break;
 369                         goto wait_on_recovery;
 370                 case -NFS4ERR_DELEG_REVOKED:
 371                 case -NFS4ERR_ADMIN_REVOKED:
 372                 case -NFS4ERR_BAD_STATEID:
 373                         if (state == NULL)
 374                                 break;
 375                         ret = nfs4_schedule_stateid_recovery(server, state);
 376                         if (ret < 0)
 377                                 break;
 378                         goto wait_on_recovery;
 379                 case -NFS4ERR_EXPIRED:
 380                         if (state != NULL) {
 381                                 ret = nfs4_schedule_stateid_recovery(server, state);
 382                                 if (ret < 0)
 383                                         break;
 384                         }
 385                 case -NFS4ERR_STALE_STATEID:
 386                 case -NFS4ERR_STALE_CLIENTID:
 387                         nfs4_schedule_lease_recovery(clp);
 388                         goto wait_on_recovery;
 389                 case -NFS4ERR_MOVED:
 390                         ret = nfs4_schedule_migration_recovery(server);
 391                         if (ret < 0)
 392                                 break;
 393                         goto wait_on_recovery;
 394                 case -NFS4ERR_LEASE_MOVED:
 395                         nfs4_schedule_lease_moved_recovery(clp);
 396                         goto wait_on_recovery;
 397 #if defined(CONFIG_NFS_V4_1)
 398                 case -NFS4ERR_BADSESSION:
 399                 case -NFS4ERR_BADSLOT:
 400                 case -NFS4ERR_BAD_HIGH_SLOT:
 401                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 402                 case -NFS4ERR_DEADSESSION:
 403                 case -NFS4ERR_SEQ_FALSE_RETRY:
 404                 case -NFS4ERR_SEQ_MISORDERED:
 405                         dprintk("%s ERROR: %d Reset session\n", __func__,
 406                                 errorcode);
 407                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 408                         goto wait_on_recovery;
 409 #endif /* defined(CONFIG_NFS_V4_1) */
 410                 case -NFS4ERR_FILE_OPEN:
 411                         if (exception->timeout > HZ) {
 412                                 /* We have retried a decent amount, time to
 413                                  * fail
 414                                  */
 415                                 ret = -EBUSY;
 416                                 break;
 417                         }
 418                 case -NFS4ERR_GRACE:
 419                 case -NFS4ERR_DELAY:
 420                         ret = nfs4_delay(server->client, &exception->timeout);
 421                         if (ret != 0)
 422                                 break;
 423                 case -NFS4ERR_RETRY_UNCACHED_REP:
 424                 case -NFS4ERR_OLD_STATEID:
 425                         exception->retry = 1;
 426                         break;
 427                 case -NFS4ERR_BADOWNER:
 428                         /* The following works around a Linux server bug! */
 429                 case -NFS4ERR_BADNAME:
 430                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 431                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 432                                 exception->retry = 1;
 433                                 printk(KERN_WARNING "NFS: v4 server %s "
 434                                                 "does not accept raw "
 435                                                 "uid/gids. "
 436                                                 "Reenabling the idmapper.\n",
 437                                                 server->nfs_client->cl_hostname);
 438                         }
 439         }
 440         /* We failed to handle the error */
 441         return nfs4_map_errors(ret);
 442 wait_on_recovery:
 443         ret = nfs4_wait_clnt_recover(clp);
 444         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 445                 return -EIO;
 446         if (ret == 0)
 447                 exception->retry = 1;
 448         return ret;
 449 }
 450
 451 /*
 452  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 453  * or 'false' otherwise.
 454  */
 455 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 456 {
 457         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 458
 459         if (flavor == RPC_AUTH_GSS_KRB5I ||
 460             flavor == RPC_AUTH_GSS_KRB5P)
 461                 return true;
 462
 463         return false;
 464 }
 465
 466 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 467 {
 468         spin_lock(&clp->cl_lock);
 469         if (time_before(clp->cl_last_renewal,timestamp))
 470                 clp->cl_last_renewal = timestamp;
 471         spin_unlock(&clp->cl_lock);
 472 }
 473
 474 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 475 {
 476         do_renew_lease(server->nfs_client, timestamp);
 477 }
 478
 479 struct nfs4_call_sync_data {
 480         const struct nfs_server *seq_server;
 481         struct nfs4_sequence_args *seq_args;
 482         struct nfs4_sequence_res *seq_res;
 483 };
 484
 485 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 486                                struct nfs4_sequence_res *res, int cache_reply)
 487 {
 488         args->sa_slot = NULL;
 489         args->sa_cache_this = cache_reply;
 490         args->sa_privileged = 0;
 491
 492         res->sr_slot = NULL;
 493 }
 494
 495 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 496 {
 497         args->sa_privileged = 1;
 498 }
 499
 500 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 501                          struct nfs4_sequence_args *args,
 502                          struct nfs4_sequence_res *res,
 503                          struct rpc_task *task)
 504 {
 505         struct nfs4_slot *slot;
 506
 507         /* slot already allocated? */
 508         if (res->sr_slot != NULL)
 509                 goto out_start;
 510
 511         spin_lock(&tbl->slot_tbl_lock);
 512         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 513                 goto out_sleep;
 514
 515         slot = nfs4_alloc_slot(tbl);
 516         if (IS_ERR(slot)) {
 517                 if (slot == ERR_PTR(-ENOMEM))
 518                         task->tk_timeout = HZ >> 2;
 519                 goto out_sleep;
 520         }
 521         spin_unlock(&tbl->slot_tbl_lock);
 522
 523         args->sa_slot = slot;
 524         res->sr_slot = slot;
 525
 526 out_start:
 527         rpc_call_start(task);
 528         return 0;
 529
 530 out_sleep:
 531         if (args->sa_privileged)
 532                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 533                                 NULL, RPC_PRIORITY_PRIVILEGED);
 534         else
 535                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 536         spin_unlock(&tbl->slot_tbl_lock);
 537         return -EAGAIN;
 538 }
 539 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 540
 541 static int nfs40_sequence_done(struct rpc_task *task,
 542                                struct nfs4_sequence_res *res)
 543 {
 544         struct nfs4_slot *slot = res->sr_slot;
 545         struct nfs4_slot_table *tbl;
 546
 547         if (slot == NULL)
 548                 goto out;
 549
 550         tbl = slot->table;
 551         spin_lock(&tbl->slot_tbl_lock);
 552         if (!nfs41_wake_and_assign_slot(tbl, slot))
 553                 nfs4_free_slot(tbl, slot);
 554         spin_unlock(&tbl->slot_tbl_lock);
 555
 556         res->sr_slot = NULL;
 557 out:
 558         return 1;
 559 }
 560
 561 #if defined(CONFIG_NFS_V4_1)
 562
 563 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 564 {
 565         struct nfs4_session *session;
 566         struct nfs4_slot_table *tbl;
 567         struct nfs4_slot *slot = res->sr_slot;
 568         bool send_new_highest_used_slotid = false;
 569
 570         tbl = slot->table;
 571         session = tbl->session;
 572
 573         spin_lock(&tbl->slot_tbl_lock);
 574         /* Be nice to the server: try to ensure that the last transmitted
 575          * value for highest_user_slotid <= target_highest_slotid
 576          */
 577         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 578                 send_new_highest_used_slotid = true;
 579
 580         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 581                 send_new_highest_used_slotid = false;
 582                 goto out_unlock;
 583         }
 584         nfs4_free_slot(tbl, slot);
 585
 586         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 587                 send_new_highest_used_slotid = false;
 588 out_unlock:
 589         spin_unlock(&tbl->slot_tbl_lock);
 590         res->sr_slot = NULL;
 591         if (send_new_highest_used_slotid)
 592                 nfs41_server_notify_highest_slotid_update(session->clp);
 593 }
 594
 595 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 596 {
 597         struct nfs4_session *session;
 598         struct nfs4_slot *slot = res->sr_slot;
 599         struct nfs_client *clp;
 600         bool interrupted = false;
 601         int ret = 1;
 602
 603         if (slot == NULL)
 604                 goto out_noaction;
 605         /* don't increment the sequence number if the task wasn't sent */
 606         if (!RPC_WAS_SENT(task))
 607                 goto out;
 608
 609         session = slot->table->session;
 610
 611         if (slot->interrupted) {
 612                 slot->interrupted = 0;
 613                 interrupted = true;
 614         }
 615
 616         trace_nfs4_sequence_done(session, res);
 617         /* Check the SEQUENCE operation status */
 618         switch (res->sr_status) {
 619         case 0:
 620                 /* Update the slot's sequence and clientid lease timer */
 621                 ++slot->seq_nr;
 622                 clp = session->clp;
 623                 do_renew_lease(clp, res->sr_timestamp);
 624                 /* Check sequence flags */
 625                 if (res->sr_status_flags != 0)
 626                         nfs4_schedule_lease_recovery(clp);
 627                 nfs41_update_target_slotid(slot->table, slot, res);
 628                 break;
 629         case 1:
 630                 /*
 631                  * sr_status remains 1 if an RPC level error occurred.
 632                  * The server may or may not have processed the sequence
 633                  * operation..
 634                  * Mark the slot as having hosted an interrupted RPC call.
 635                  */
 636                 slot->interrupted = 1;
 637                 goto out;
 638         case -NFS4ERR_DELAY:
 639                 /* The server detected a resend of the RPC call and
 640                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 641                  * of RFC5661.
 642                  */
 643                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 644                         __func__,
 645                         slot->slot_nr,
 646                         slot->seq_nr);
 647                 goto out_retry;
 648         case -NFS4ERR_BADSLOT:
 649                 /*
 650                  * The slot id we used was probably retired. Try again
 651                  * using a different slot id.
 652                  */
 653                 goto retry_nowait;
 654         case -NFS4ERR_SEQ_MISORDERED:
 655                 /*
 656                  * Was the last operation on this sequence interrupted?
 657                  * If so, retry after bumping the sequence number.
 658                  */
 659                 if (interrupted) {
 660                         ++slot->seq_nr;
 661                         goto retry_nowait;
 662                 }
 663                 /*
 664                  * Could this slot have been previously retired?
 665                  * If so, then the server may be expecting seq_nr = 1!
 666                  */
 667                 if (slot->seq_nr != 1) {
 668                         slot->seq_nr = 1;
 669                         goto retry_nowait;
 670                 }
 671                 break;
 672         case -NFS4ERR_SEQ_FALSE_RETRY:
 673                 ++slot->seq_nr;
 674                 goto retry_nowait;
 675         default:
 676                 /* Just update the slot sequence no. */
 677                 ++slot->seq_nr;
 678         }
 679 out:
 680         /* The session may be reset by one of the error handlers. */
 681         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 682         nfs41_sequence_free_slot(res);
 683 out_noaction:
 684         return ret;
 685 retry_nowait:
 686         if (rpc_restart_call_prepare(task)) {
 687                 task->tk_status = 0;
 688                 ret = 0;
 689         }
 690         goto out;
 691 out_retry:
 692         if (!rpc_restart_call(task))
 693                 goto out;
 694         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 695         return 0;
 696 }
 697 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 698
 699 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 700 {
 701         if (res->sr_slot == NULL)
 702                 return 1;
 703         if (!res->sr_slot->table->session)
 704                 return nfs40_sequence_done(task, res);
 705         return nfs41_sequence_done(task, res);
 706 }
 707 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 708
 709 int nfs41_setup_sequence(struct nfs4_session *session,
 710                                 struct nfs4_sequence_args *args,
 711                                 struct nfs4_sequence_res *res,
 712                                 struct rpc_task *task)
 713 {
 714         struct nfs4_slot *slot;
 715         struct nfs4_slot_table *tbl;
 716
 717         dprintk("--> %s\n", __func__);
 718         /* slot already allocated? */
 719         if (res->sr_slot != NULL)
 720                 goto out_success;
 721
 722         tbl = &session->fc_slot_table;
 723
 724         task->tk_timeout = 0;
 725
 726         spin_lock(&tbl->slot_tbl_lock);
 727         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 728             !args->sa_privileged) {
 729                 /* The state manager will wait until the slot table is empty */
 730                 dprintk("%s session is draining\n", __func__);
 731                 goto out_sleep;
 732         }
 733
 734         slot = nfs4_alloc_slot(tbl);
 735         if (IS_ERR(slot)) {
 736                 /* If out of memory, try again in 1/4 second */
 737                 if (slot == ERR_PTR(-ENOMEM))
 738                         task->tk_timeout = HZ >> 2;
 739                 dprintk("<-- %s: no free slots\n", __func__);
 740                 goto out_sleep;
 741         }
 742         spin_unlock(&tbl->slot_tbl_lock);
 743
 744         args->sa_slot = slot;
 745
 746         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 747                         slot->slot_nr, slot->seq_nr);
 748
 749         res->sr_slot = slot;
 750         res->sr_timestamp = jiffies;
 751         res->sr_status_flags = 0;
 752         /*
 753          * sr_status is only set in decode_sequence, and so will remain
 754          * set to 1 if an rpc level failure occurs.
 755          */
 756         res->sr_status = 1;
 757         trace_nfs4_setup_sequence(session, args);
 758 out_success:
 759         rpc_call_start(task);
 760         return 0;
 761 out_sleep:
 762         /* Privileged tasks are queued with top priority */
 763         if (args->sa_privileged)
 764                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 765                                 NULL, RPC_PRIORITY_PRIVILEGED);
 766         else
 767                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 768         spin_unlock(&tbl->slot_tbl_lock);
 769         return -EAGAIN;
 770 }
 771 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 772
 773 static int nfs4_setup_sequence(const struct nfs_server *server,
 774                                struct nfs4_sequence_args *args,
 775                                struct nfs4_sequence_res *res,
 776                                struct rpc_task *task)
 777 {
 778         struct nfs4_session *session = nfs4_get_session(server);
 779         int ret = 0;
 780
 781         if (!session)
 782                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 783                                             args, res, task);
 784
 785         dprintk("--> %s clp %p session %p sr_slot %u\n",
 786                 __func__, session->clp, session, res->sr_slot ?
 787                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 788
 789         ret = nfs41_setup_sequence(session, args, res, task);
 790
 791         dprintk("<-- %s status=%d\n", __func__, ret);
 792         return ret;
 793 }
 794
 795 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 796 {
 797         struct nfs4_call_sync_data *data = calldata;
 798         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 799
 800         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 801
 802         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 803 }
 804
 805 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 806 {
 807         struct nfs4_call_sync_data *data = calldata;
 808
 809         nfs41_sequence_done(task, data->seq_res);
 810 }
 811
 812 static const struct rpc_call_ops nfs41_call_sync_ops = {
 813         .rpc_call_prepare = nfs41_call_sync_prepare,
 814         .rpc_call_done = nfs41_call_sync_done,
 815 };
 816
 817 #else   /* !CONFIG_NFS_V4_1 */
 818
 819 static int nfs4_setup_sequence(const struct nfs_server *server,
 820                                struct nfs4_sequence_args *args,
 821                                struct nfs4_sequence_res *res,
 822                                struct rpc_task *task)
 823 {
 824         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 825                                     args, res, task);
 826 }
 827
 828 int nfs4_sequence_done(struct rpc_task *task,
 829                        struct nfs4_sequence_res *res)
 830 {
 831         return nfs40_sequence_done(task, res);
 832 }
 833 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 834
 835 #endif  /* !CONFIG_NFS_V4_1 */
 836
 837 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 838 {
 839         struct nfs4_call_sync_data *data = calldata;
 840         nfs4_setup_sequence(data->seq_server,
 841                                 data->seq_args, data->seq_res, task);
 842 }
 843
 844 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 845 {
 846         struct nfs4_call_sync_data *data = calldata;
 847         nfs4_sequence_done(task, data->seq_res);
 848 }
 849
 850 static const struct rpc_call_ops nfs40_call_sync_ops = {
 851         .rpc_call_prepare = nfs40_call_sync_prepare,
 852         .rpc_call_done = nfs40_call_sync_done,
 853 };
 854
 855 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 856                                    struct nfs_server *server,
 857                                    struct rpc_message *msg,
 858                                    struct nfs4_sequence_args *args,
 859                                    struct nfs4_sequence_res *res)
 860 {
 861         int ret;
 862         struct rpc_task *task;
 863         struct nfs_client *clp = server->nfs_client;
 864         struct nfs4_call_sync_data data = {
 865                 .seq_server = server,
 866                 .seq_args = args,
 867                 .seq_res = res,
 868         };
 869         struct rpc_task_setup task_setup = {
 870                 .rpc_client = clnt,
 871                 .rpc_message = msg,
 872                 .callback_ops = clp->cl_mvops->call_sync_ops,
 873                 .callback_data = &data
 874         };
 875
 876         task = rpc_run_task(&task_setup);
 877         if (IS_ERR(task))
 878                 ret = PTR_ERR(task);
 879         else {
 880                 ret = task->tk_status;
 881                 rpc_put_task(task);
 882         }
 883         return ret;
 884 }
 885
 886 int nfs4_call_sync(struct rpc_clnt *clnt,
 887                    struct nfs_server *server,
 888                    struct rpc_message *msg,
 889                    struct nfs4_sequence_args *args,
 890                    struct nfs4_sequence_res *res,
 891                    int cache_reply)
 892 {
 893         nfs4_init_sequence(args, res, cache_reply);
 894         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 895 }
 896
 897 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 898 {
 899         struct nfs_inode *nfsi = NFS_I(dir);
 900
 901         spin_lock(&dir->i_lock);
 902         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 903         if (!cinfo->atomic || cinfo->before != dir->i_version)
 904                 nfs_force_lookup_revalidate(dir);
 905         dir->i_version = cinfo->after;
 906         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
 907         nfs_fscache_invalidate(dir);
 908         spin_unlock(&dir->i_lock);
 909 }
 910
 911 struct nfs4_opendata {
 912         struct kref kref;
 913         struct nfs_openargs o_arg;
 914         struct nfs_openres o_res;
 915         struct nfs_open_confirmargs c_arg;
 916         struct nfs_open_confirmres c_res;
 917         struct nfs4_string owner_name;
 918         struct nfs4_string group_name;
 919         struct nfs_fattr f_attr;
 920         struct nfs4_label *f_label;
 921         struct dentry *dir;
 922         struct dentry *dentry;
 923         struct nfs4_state_owner *owner;
 924         struct nfs4_state *state;
 925         struct iattr attrs;
 926         unsigned long timestamp;
 927         unsigned int rpc_done : 1;
 928         unsigned int file_created : 1;
 929         unsigned int is_recover : 1;
 930         int rpc_status;
 931         int cancelled;
 932 };
 933
 934 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 935                 int err, struct nfs4_exception *exception)
 936 {
 937         if (err != -EINVAL)
 938                 return false;
 939         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 940                 return false;
 941         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 942         exception->retry = 1;
 943         return true;
 944 }
 945
 946 static u32
 947 nfs4_map_atomic_open_share(struct nfs_server *server,
 948                 fmode_t fmode, int openflags)
 949 {
 950         u32 res = 0;
 951
 952         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 953         case FMODE_READ:
 954                 res = NFS4_SHARE_ACCESS_READ;
 955                 break;
 956         case FMODE_WRITE:
 957                 res = NFS4_SHARE_ACCESS_WRITE;
 958                 break;
 959         case FMODE_READ|FMODE_WRITE:
 960                 res = NFS4_SHARE_ACCESS_BOTH;
 961         }
 962         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 963                 goto out;
 964         /* Want no delegation if we're using O_DIRECT */
 965         if (openflags & O_DIRECT)
 966                 res |= NFS4_SHARE_WANT_NO_DELEG;
 967 out:
 968         return res;
 969 }
 970
 971 static enum open_claim_type4
 972 nfs4_map_atomic_open_claim(struct nfs_server *server,
 973                 enum open_claim_type4 claim)
 974 {
 975         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 976                 return claim;
 977         switch (claim) {
 978         default:
 979                 return claim;
 980         case NFS4_OPEN_CLAIM_FH:
 981                 return NFS4_OPEN_CLAIM_NULL;
 982         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 983                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 984         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 985                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 986         }
 987 }
 988
 989 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 990 {
 991         p->o_res.f_attr = &p->f_attr;
 992         p->o_res.f_label = p->f_label;
 993         p->o_res.seqid = p->o_arg.seqid;
 994         p->c_res.seqid = p->c_arg.seqid;
 995         p->o_res.server = p->o_arg.server;
 996         p->o_res.access_request = p->o_arg.access;
 997         nfs_fattr_init(&p->f_attr);
 998         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 999 }
1000
1001 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1002                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1003                 const struct iattr *attrs,
1004                 struct nfs4_label *label,
1005                 enum open_claim_type4 claim,
1006                 gfp_t gfp_mask)
1007 {
1008         struct dentry *parent = dget_parent(dentry);
1009         struct inode *dir = d_inode(parent);
1010         struct nfs_server *server = NFS_SERVER(dir);
1011         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1012         struct nfs4_opendata *p;
1013
1014         p = kzalloc(sizeof(*p), gfp_mask);
1015         if (p == NULL)
1016                 goto err;
1017
1018         p->f_label = nfs4_label_alloc(server, gfp_mask);
1019         if (IS_ERR(p->f_label))
1020                 goto err_free_p;
1021
1022         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1023         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1024         if (IS_ERR(p->o_arg.seqid))
1025                 goto err_free_label;
1026         nfs_sb_active(dentry->d_sb);
1027         p->dentry = dget(dentry);
1028         p->dir = parent;
1029         p->owner = sp;
1030         atomic_inc(&sp->so_count);
1031         p->o_arg.open_flags = flags;
1032         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1033         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1034                         fmode, flags);
1035         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1036          * will return permission denied for all bits until close */
1037         if (!(flags & O_EXCL)) {
1038                 /* ask server to check for all possible rights as results
1039                  * are cached */
1040                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1041                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1042         }
1043         p->o_arg.clientid = server->nfs_client->cl_clientid;
1044         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1045         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1046         p->o_arg.name = &dentry->d_name;
1047         p->o_arg.server = server;
1048         p->o_arg.bitmask = nfs4_bitmask(server, label);
1049         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1050         p->o_arg.label = label;
1051         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1052         switch (p->o_arg.claim) {
1053         case NFS4_OPEN_CLAIM_NULL:
1054         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1055         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1056                 p->o_arg.fh = NFS_FH(dir);
1057                 break;
1058         case NFS4_OPEN_CLAIM_PREVIOUS:
1059         case NFS4_OPEN_CLAIM_FH:
1060         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1061         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1062                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1063         }
1064         if (attrs != NULL && attrs->ia_valid != 0) {
1065                 __u32 verf[2];
1066
1067                 p->o_arg.u.attrs = &p->attrs;
1068                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1069
1070                 verf[0] = jiffies;
1071                 verf[1] = current->pid;
1072                 memcpy(p->o_arg.u.verifier.data, verf,
1073                                 sizeof(p->o_arg.u.verifier.data));
1074         }
1075         p->c_arg.fh = &p->o_res.fh;
1076         p->c_arg.stateid = &p->o_res.stateid;
1077         p->c_arg.seqid = p->o_arg.seqid;
1078         nfs4_init_opendata_res(p);
1079         kref_init(&p->kref);
1080         return p;
1081
1082 err_free_label:
1083         nfs4_label_free(p->f_label);
1084 err_free_p:
1085         kfree(p);
1086 err:
1087         dput(parent);
1088         return NULL;
1089 }
1090
1091 static void nfs4_opendata_free(struct kref *kref)
1092 {
1093         struct nfs4_opendata *p = container_of(kref,
1094                         struct nfs4_opendata, kref);
1095         struct super_block *sb = p->dentry->d_sb;
1096
1097         nfs_free_seqid(p->o_arg.seqid);
1098         if (p->state != NULL)
1099                 nfs4_put_open_state(p->state);
1100         nfs4_put_state_owner(p->owner);
1101
1102         nfs4_label_free(p->f_label);
1103
1104         dput(p->dir);
1105         dput(p->dentry);
1106         nfs_sb_deactive(sb);
1107         nfs_fattr_free_names(&p->f_attr);
1108         kfree(p->f_attr.mdsthreshold);
1109         kfree(p);
1110 }
1111
1112 static void nfs4_opendata_put(struct nfs4_opendata *p)
1113 {
1114         if (p != NULL)
1115                 kref_put(&p->kref, nfs4_opendata_free);
1116 }
1117
1118 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1119 {
1120         int ret;
1121
1122         ret = rpc_wait_for_completion_task(task);
1123         return ret;
1124 }
1125
1126 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1127 {
1128         int ret = 0;
1129
1130         if (open_mode & (O_EXCL|O_TRUNC))
1131                 goto out;
1132         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1133                 case FMODE_READ:
1134                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1135                                 && state->n_rdonly != 0;
1136                         break;
1137                 case FMODE_WRITE:
1138                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1139                                 && state->n_wronly != 0;
1140                         break;
1141                 case FMODE_READ|FMODE_WRITE:
1142                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1143                                 && state->n_rdwr != 0;
1144         }
1145 out:
1146         return ret;
1147 }
1148
1149 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1150 {
1151         if (delegation == NULL)
1152                 return 0;
1153         if ((delegation->type & fmode) != fmode)
1154                 return 0;
1155         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1156                 return 0;
1157         nfs_mark_delegation_referenced(delegation);
1158         return 1;
1159 }
1160
1161 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1162 {
1163         switch (fmode) {
1164                 case FMODE_WRITE:
1165                         state->n_wronly++;
1166                         break;
1167                 case FMODE_READ:
1168                         state->n_rdonly++;
1169                         break;
1170                 case FMODE_READ|FMODE_WRITE:
1171                         state->n_rdwr++;
1172         }
1173         nfs4_state_set_mode_locked(state, state->state | fmode);
1174 }
1175
1176 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1177 {
1178         struct nfs_client *clp = state->owner->so_server->nfs_client;
1179         bool need_recover = false;
1180
1181         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1182                 need_recover = true;
1183         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1184                 need_recover = true;
1185         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1186                 need_recover = true;
1187         if (need_recover)
1188                 nfs4_state_mark_reclaim_nograce(clp, state);
1189 }
1190
1191 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1192                 nfs4_stateid *stateid)
1193 {
1194         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1195                 return true;
1196         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1197                 nfs_test_and_clear_all_open_stateid(state);
1198                 return true;
1199         }
1200         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1201                 return true;
1202         return false;
1203 }
1204
1205 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1206 {
1207         if (state->n_wronly)
1208                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1209         if (state->n_rdonly)
1210                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1211         if (state->n_rdwr)
1212                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1213 }
1214
1215 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1216                 nfs4_stateid *stateid, fmode_t fmode)
1217 {
1218         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1219         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1220         case FMODE_WRITE:
1221                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1222                 break;
1223         case FMODE_READ:
1224                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1225                 break;
1226         case 0:
1227                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1228                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1229                 clear_bit(NFS_OPEN_STATE, &state->flags);
1230         }
1231         if (stateid == NULL)
1232                 return;
1233         /* Handle races with OPEN */
1234         if (!nfs4_stateid_match_other(stateid, &state->open_stateid) ||
1235             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1236                 nfs_resync_open_stateid_locked(state);
1237                 return;
1238         }
1239         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1240                 nfs4_stateid_copy(&state->stateid, stateid);
1241         nfs4_stateid_copy(&state->open_stateid, stateid);
1242 }
1243
1244 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1245 {
1246         write_seqlock(&state->seqlock);
1247         nfs_clear_open_stateid_locked(state, stateid, fmode);
1248         write_sequnlock(&state->seqlock);
1249         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1250                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1251 }
1252
1253 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1254 {
1255         switch (fmode) {
1256                 case FMODE_READ:
1257                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1258                         break;
1259                 case FMODE_WRITE:
1260                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1261                         break;
1262                 case FMODE_READ|FMODE_WRITE:
1263                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1264         }
1265         if (!nfs_need_update_open_stateid(state, stateid))
1266                 return;
1267         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1268                 nfs4_stateid_copy(&state->stateid, stateid);
1269         nfs4_stateid_copy(&state->open_stateid, stateid);
1270 }
1271
1272 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1273 {
1274         /*
1275          * Protect the call to nfs4_state_set_mode_locked and
1276          * serialise the stateid update
1277          */
1278         write_seqlock(&state->seqlock);
1279         if (deleg_stateid != NULL) {
1280                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1281                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1282         }
1283         if (open_stateid != NULL)
1284                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1285         write_sequnlock(&state->seqlock);
1286         spin_lock(&state->owner->so_lock);
1287         update_open_stateflags(state, fmode);
1288         spin_unlock(&state->owner->so_lock);
1289 }
1290
1291 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1292 {
1293         struct nfs_inode *nfsi = NFS_I(state->inode);
1294         struct nfs_delegation *deleg_cur;
1295         int ret = 0;
1296
1297         fmode &= (FMODE_READ|FMODE_WRITE);
1298
1299         rcu_read_lock();
1300         deleg_cur = rcu_dereference(nfsi->delegation);
1301         if (deleg_cur == NULL)
1302                 goto no_delegation;
1303
1304         spin_lock(&deleg_cur->lock);
1305         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1306            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1307             (deleg_cur->type & fmode) != fmode)
1308                 goto no_delegation_unlock;
1309
1310         if (delegation == NULL)
1311                 delegation = &deleg_cur->stateid;
1312         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1313                 goto no_delegation_unlock;
1314
1315         nfs_mark_delegation_referenced(deleg_cur);
1316         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1317         ret = 1;
1318 no_delegation_unlock:
1319         spin_unlock(&deleg_cur->lock);
1320 no_delegation:
1321         rcu_read_unlock();
1322
1323         if (!ret && open_stateid != NULL) {
1324                 __update_open_stateid(state, open_stateid, NULL, fmode);
1325                 ret = 1;
1326         }
1327         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1328                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1329
1330         return ret;
1331 }
1332
1333 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1334                 const nfs4_stateid *stateid)
1335 {
1336         struct nfs4_state *state = lsp->ls_state;
1337         bool ret = false;
1338
1339         spin_lock(&state->state_lock);
1340         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1341                 goto out_noupdate;
1342         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1343                 goto out_noupdate;
1344         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1345         ret = true;
1346 out_noupdate:
1347         spin_unlock(&state->state_lock);
1348         return ret;
1349 }
1350
1351 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1352 {
1353         struct nfs_delegation *delegation;
1354
1355         rcu_read_lock();
1356         delegation = rcu_dereference(NFS_I(inode)->delegation);
1357         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1358                 rcu_read_unlock();
1359                 return;
1360         }
1361         rcu_read_unlock();
1362         nfs4_inode_return_delegation(inode);
1363 }
1364
1365 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1366 {
1367         struct nfs4_state *state = opendata->state;
1368         struct nfs_inode *nfsi = NFS_I(state->inode);
1369         struct nfs_delegation *delegation;
1370         int open_mode = opendata->o_arg.open_flags;
1371         fmode_t fmode = opendata->o_arg.fmode;
1372         nfs4_stateid stateid;
1373         int ret = -EAGAIN;
1374
1375         for (;;) {
1376                 spin_lock(&state->owner->so_lock);
1377                 if (can_open_cached(state, fmode, open_mode)) {
1378                         update_open_stateflags(state, fmode);
1379                         spin_unlock(&state->owner->so_lock);
1380                         goto out_return_state;
1381                 }
1382                 spin_unlock(&state->owner->so_lock);
1383                 rcu_read_lock();
1384                 delegation = rcu_dereference(nfsi->delegation);
1385                 if (!can_open_delegated(delegation, fmode)) {
1386                         rcu_read_unlock();
1387                         break;
1388                 }
1389                 /* Save the delegation */
1390                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1391                 rcu_read_unlock();
1392                 nfs_release_seqid(opendata->o_arg.seqid);
1393                 if (!opendata->is_recover) {
1394                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1395                         if (ret != 0)
1396                                 goto out;
1397                 }
1398                 ret = -EAGAIN;
1399
1400                 /* Try to update the stateid using the delegation */
1401                 if (update_open_stateid(state, NULL, &stateid, fmode))
1402                         goto out_return_state;
1403         }
1404 out:
1405         return ERR_PTR(ret);
1406 out_return_state:
1407         atomic_inc(&state->count);
1408         return state;
1409 }
1410
1411 static void
1412 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1413 {
1414         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1415         struct nfs_delegation *delegation;
1416         int delegation_flags = 0;
1417
1418         rcu_read_lock();
1419         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1420         if (delegation)
1421                 delegation_flags = delegation->flags;
1422         rcu_read_unlock();
1423         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1424                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1425                                    "returning a delegation for "
1426                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1427                                    clp->cl_hostname);
1428         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1429                 nfs_inode_set_delegation(state->inode,
1430                                          data->owner->so_cred,
1431                                          &data->o_res);
1432         else
1433                 nfs_inode_reclaim_delegation(state->inode,
1434                                              data->owner->so_cred,
1435                                              &data->o_res);
1436 }
1437
1438 /*
1439  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1440  * and update the nfs4_state.
1441  */
1442 static struct nfs4_state *
1443 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1444 {
1445         struct inode *inode = data->state->inode;
1446         struct nfs4_state *state = data->state;
1447         int ret;
1448
1449         if (!data->rpc_done) {
1450                 if (data->rpc_status) {
1451                         ret = data->rpc_status;
1452                         goto err;
1453                 }
1454                 /* cached opens have already been processed */
1455                 goto update;
1456         }
1457
1458         ret = nfs_refresh_inode(inode, &data->f_attr);
1459         if (ret)
1460                 goto err;
1461
1462         if (data->o_res.delegation_type != 0)
1463                 nfs4_opendata_check_deleg(data, state);
1464 update:
1465         update_open_stateid(state, &data->o_res.stateid, NULL,
1466                             data->o_arg.fmode);
1467         atomic_inc(&state->count);
1468
1469         return state;
1470 err:
1471         return ERR_PTR(ret);
1472
1473 }
1474
1475 static struct nfs4_state *
1476 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1477 {
1478         struct inode *inode;
1479         struct nfs4_state *state = NULL;
1480         int ret;
1481
1482         if (!data->rpc_done) {
1483                 state = nfs4_try_open_cached(data);
1484                 goto out;
1485         }
1486
1487         ret = -EAGAIN;
1488         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1489                 goto err;
1490         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1491         ret = PTR_ERR(inode);
1492         if (IS_ERR(inode))
1493                 goto err;
1494         ret = -ENOMEM;
1495         state = nfs4_get_open_state(inode, data->owner);
1496         if (state == NULL)
1497                 goto err_put_inode;
1498         if (data->o_res.delegation_type != 0)
1499                 nfs4_opendata_check_deleg(data, state);
1500         update_open_stateid(state, &data->o_res.stateid, NULL,
1501                         data->o_arg.fmode);
1502         iput(inode);
1503 out:
1504         nfs_release_seqid(data->o_arg.seqid);
1505         return state;
1506 err_put_inode:
1507         iput(inode);
1508 err:
1509         return ERR_PTR(ret);
1510 }
1511
1512 static struct nfs4_state *
1513 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1514 {
1515         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1516                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1517         return _nfs4_opendata_to_nfs4_state(data);
1518 }
1519
1520 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1521 {
1522         struct nfs_inode *nfsi = NFS_I(state->inode);
1523         struct nfs_open_context *ctx;
1524
1525         spin_lock(&state->inode->i_lock);
1526         list_for_each_entry(ctx, &nfsi->open_files, list) {
1527                 if (ctx->state != state)
1528                         continue;
1529                 get_nfs_open_context(ctx);
1530                 spin_unlock(&state->inode->i_lock);
1531                 return ctx;
1532         }
1533         spin_unlock(&state->inode->i_lock);
1534         return ERR_PTR(-ENOENT);
1535 }
1536
1537 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1538                 struct nfs4_state *state, enum open_claim_type4 claim)
1539 {
1540         struct nfs4_opendata *opendata;
1541
1542         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1543                         NULL, NULL, claim, GFP_NOFS);
1544         if (opendata == NULL)
1545                 return ERR_PTR(-ENOMEM);
1546         opendata->state = state;
1547         atomic_inc(&state->count);
1548         return opendata;
1549 }
1550
1551 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1552 {
1553         struct nfs4_state *newstate;
1554         int ret;
1555
1556         opendata->o_arg.open_flags = 0;
1557         opendata->o_arg.fmode = fmode;
1558         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1559                         NFS_SB(opendata->dentry->d_sb),
1560                         fmode, 0);
1561         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1562         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1563         nfs4_init_opendata_res(opendata);
1564         ret = _nfs4_recover_proc_open(opendata);
1565         if (ret != 0)
1566                 return ret;
1567         newstate = nfs4_opendata_to_nfs4_state(opendata);
1568         if (IS_ERR(newstate))
1569                 return PTR_ERR(newstate);
1570         nfs4_close_state(newstate, fmode);
1571         *res = newstate;
1572         return 0;
1573 }
1574
1575 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1576 {
1577         struct nfs4_state *newstate;
1578         int ret;
1579
1580         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1581         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1582         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1583         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1584         /* memory barrier prior to reading state->n_* */
1585         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1586         clear_bit(NFS_OPEN_STATE, &state->flags);
1587         smp_rmb();
1588         if (state->n_rdwr != 0) {
1589                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1590                 if (ret != 0)
1591                         return ret;
1592                 if (newstate != state)
1593                         return -ESTALE;
1594         }
1595         if (state->n_wronly != 0) {
1596                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1597                 if (ret != 0)
1598                         return ret;
1599                 if (newstate != state)
1600                         return -ESTALE;
1601         }
1602         if (state->n_rdonly != 0) {
1603                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1604                 if (ret != 0)
1605                         return ret;
1606                 if (newstate != state)
1607                         return -ESTALE;
1608         }
1609         /*
1610          * We may have performed cached opens for all three recoveries.
1611          * Check if we need to update the current stateid.
1612          */
1613         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1614             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1615                 write_seqlock(&state->seqlock);
1616                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1617                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1618                 write_sequnlock(&state->seqlock);
1619         }
1620         return 0;
1621 }
1622
1623 /*
1624  * OPEN_RECLAIM:
1625  *      reclaim state on the server after a reboot.
1626  */
1627 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1628 {
1629         struct nfs_delegation *delegation;
1630         struct nfs4_opendata *opendata;
1631         fmode_t delegation_type = 0;
1632         int status;
1633
1634         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1635                         NFS4_OPEN_CLAIM_PREVIOUS);
1636         if (IS_ERR(opendata))
1637                 return PTR_ERR(opendata);
1638         rcu_read_lock();
1639         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1640         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1641                 delegation_type = delegation->type;
1642         rcu_read_unlock();
1643         opendata->o_arg.u.delegation_type = delegation_type;
1644         status = nfs4_open_recover(opendata, state);
1645         nfs4_opendata_put(opendata);
1646         return status;
1647 }
1648
1649 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1650 {
1651         struct nfs_server *server = NFS_SERVER(state->inode);
1652         struct nfs4_exception exception = { };
1653         int err;
1654         do {
1655                 err = _nfs4_do_open_reclaim(ctx, state);
1656                 trace_nfs4_open_reclaim(ctx, 0, err);
1657                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1658                         continue;
1659                 if (err != -NFS4ERR_DELAY)
1660                         break;
1661                 nfs4_handle_exception(server, err, &exception);
1662         } while (exception.retry);
1663         return err;
1664 }
1665
1666 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1667 {
1668         struct nfs_open_context *ctx;
1669         int ret;
1670
1671         ctx = nfs4_state_find_open_context(state);
1672         if (IS_ERR(ctx))
1673                 return -EAGAIN;
1674         ret = nfs4_do_open_reclaim(ctx, state);
1675         put_nfs_open_context(ctx);
1676         return ret;
1677 }
1678
1679 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1680 {
1681         switch (err) {
1682                 default:
1683                         printk(KERN_ERR "NFS: %s: unhandled error "
1684                                         "%d.\n", __func__, err);
1685                 case 0:
1686                 case -ENOENT:
1687                 case -ESTALE:
1688                         break;
1689                 case -NFS4ERR_BADSESSION:
1690                 case -NFS4ERR_BADSLOT:
1691                 case -NFS4ERR_BAD_HIGH_SLOT:
1692                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1693                 case -NFS4ERR_DEADSESSION:
1694                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1695                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1696                         return -EAGAIN;
1697                 case -NFS4ERR_STALE_CLIENTID:
1698                 case -NFS4ERR_STALE_STATEID:
1699                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1700                 case -NFS4ERR_EXPIRED:
1701                         /* Don't recall a delegation if it was lost */
1702                         nfs4_schedule_lease_recovery(server->nfs_client);
1703                         return -EAGAIN;
1704                 case -NFS4ERR_MOVED:
1705                         nfs4_schedule_migration_recovery(server);
1706                         return -EAGAIN;
1707                 case -NFS4ERR_LEASE_MOVED:
1708                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1709                         return -EAGAIN;
1710                 case -NFS4ERR_DELEG_REVOKED:
1711                 case -NFS4ERR_ADMIN_REVOKED:
1712                 case -NFS4ERR_BAD_STATEID:
1713                 case -NFS4ERR_OPENMODE:
1714                         nfs_inode_find_state_and_recover(state->inode,
1715                                         stateid);
1716                         nfs4_schedule_stateid_recovery(server, state);
1717                         return -EAGAIN;
1718                 case -NFS4ERR_DELAY:
1719                 case -NFS4ERR_GRACE:
1720                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1721                         ssleep(1);
1722                         return -EAGAIN;
1723                 case -ENOMEM:
1724                 case -NFS4ERR_DENIED:
1725                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1726                         return 0;
1727         }
1728         return err;
1729 }
1730
1731 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1732 {
1733         struct nfs_server *server = NFS_SERVER(state->inode);
1734         struct nfs4_opendata *opendata;
1735         int err;
1736
1737         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1738                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1739         if (IS_ERR(opendata))
1740                 return PTR_ERR(opendata);
1741         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1742         err = nfs4_open_recover(opendata, state);
1743         nfs4_opendata_put(opendata);
1744         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1745 }
1746
1747 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1748 {
1749         struct nfs4_opendata *data = calldata;
1750
1751         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1752                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1753 }
1754
1755 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1756 {
1757         struct nfs4_opendata *data = calldata;
1758
1759         nfs40_sequence_done(task, &data->c_res.seq_res);
1760
1761         data->rpc_status = task->tk_status;
1762         if (data->rpc_status == 0) {
1763                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1764                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1765                 renew_lease(data->o_res.server, data->timestamp);
1766                 data->rpc_done = 1;
1767         }
1768 }
1769
1770 static void nfs4_open_confirm_release(void *calldata)
1771 {
1772         struct nfs4_opendata *data = calldata;
1773         struct nfs4_state *state = NULL;
1774
1775         /* If this request hasn't been cancelled, do nothing */
1776         if (data->cancelled == 0)
1777                 goto out_free;
1778         /* In case of error, no cleanup! */
1779         if (!data->rpc_done)
1780                 goto out_free;
1781         state = nfs4_opendata_to_nfs4_state(data);
1782         if (!IS_ERR(state))
1783                 nfs4_close_state(state, data->o_arg.fmode);
1784 out_free:
1785         nfs4_opendata_put(data);
1786 }
1787
1788 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1789         .rpc_call_prepare = nfs4_open_confirm_prepare,
1790         .rpc_call_done = nfs4_open_confirm_done,
1791         .rpc_release = nfs4_open_confirm_release,
1792 };
1793
1794 /*
1795  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1796  */
1797 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1798 {
1799         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
1800         struct rpc_task *task;
1801         struct  rpc_message msg = {
1802                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1803                 .rpc_argp = &data->c_arg,
1804                 .rpc_resp = &data->c_res,
1805                 .rpc_cred = data->owner->so_cred,
1806         };
1807         struct rpc_task_setup task_setup_data = {
1808                 .rpc_client = server->client,
1809                 .rpc_message = &msg,
1810                 .callback_ops = &nfs4_open_confirm_ops,
1811                 .callback_data = data,
1812                 .workqueue = nfsiod_workqueue,
1813                 .flags = RPC_TASK_ASYNC,
1814         };
1815         int status;
1816
1817         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1818         kref_get(&data->kref);
1819         data->rpc_done = 0;
1820         data->rpc_status = 0;
1821         data->timestamp = jiffies;
1822         task = rpc_run_task(&task_setup_data);
1823         if (IS_ERR(task))
1824                 return PTR_ERR(task);
1825         status = nfs4_wait_for_completion_rpc_task(task);
1826         if (status != 0) {
1827                 data->cancelled = 1;
1828                 smp_wmb();
1829         } else
1830                 status = data->rpc_status;
1831         rpc_put_task(task);
1832         return status;
1833 }
1834
1835 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1836 {
1837         struct nfs4_opendata *data = calldata;
1838         struct nfs4_state_owner *sp = data->owner;
1839         struct nfs_client *clp = sp->so_server->nfs_client;
1840
1841         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1842                 goto out_wait;
1843         /*
1844          * Check if we still need to send an OPEN call, or if we can use
1845          * a delegation instead.
1846          */
1847         if (data->state != NULL) {
1848                 struct nfs_delegation *delegation;
1849
1850                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1851                         goto out_no_action;
1852                 rcu_read_lock();
1853                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1854                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1855                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1856                     can_open_delegated(delegation, data->o_arg.fmode))
1857                         goto unlock_no_action;
1858                 rcu_read_unlock();
1859         }
1860         /* Update client id. */
1861         data->o_arg.clientid = clp->cl_clientid;
1862         switch (data->o_arg.claim) {
1863         case NFS4_OPEN_CLAIM_PREVIOUS:
1864         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1865         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1866                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1867         case NFS4_OPEN_CLAIM_FH:
1868                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1869                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1870         }
1871         data->timestamp = jiffies;
1872         if (nfs4_setup_sequence(data->o_arg.server,
1873                                 &data->o_arg.seq_args,
1874                                 &data->o_res.seq_res,
1875                                 task) != 0)
1876                 nfs_release_seqid(data->o_arg.seqid);
1877
1878         /* Set the create mode (note dependency on the session type) */
1879         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1880         if (data->o_arg.open_flags & O_EXCL) {
1881                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1882                 if (nfs4_has_persistent_session(clp))
1883                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1884                 else if (clp->cl_mvops->minor_version > 0)
1885                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1886         }
1887         return;
1888 unlock_no_action:
1889         rcu_read_unlock();
1890 out_no_action:
1891         task->tk_action = NULL;
1892 out_wait:
1893         nfs4_sequence_done(task, &data->o_res.seq_res);
1894 }
1895
1896 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1897 {
1898         struct nfs4_opendata *data = calldata;
1899
1900         data->rpc_status = task->tk_status;
1901
1902         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1903                 return;
1904
1905         if (task->tk_status == 0) {
1906                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1907                         switch (data->o_res.f_attr->mode & S_IFMT) {
1908                         case S_IFREG:
1909                                 break;
1910                         case S_IFLNK:
1911                                 data->rpc_status = -ELOOP;
1912                                 break;
1913                         case S_IFDIR:
1914                                 data->rpc_status = -EISDIR;
1915                                 break;
1916                         default:
1917                                 data->rpc_status = -ENOTDIR;
1918                         }
1919                 }
1920                 renew_lease(data->o_res.server, data->timestamp);
1921                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1922                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1923         }
1924         data->rpc_done = 1;
1925 }
1926
1927 static void nfs4_open_release(void *calldata)
1928 {
1929         struct nfs4_opendata *data = calldata;
1930         struct nfs4_state *state = NULL;
1931
1932         /* If this request hasn't been cancelled, do nothing */
1933         if (data->cancelled == 0)
1934                 goto out_free;
1935         /* In case of error, no cleanup! */
1936         if (data->rpc_status != 0 || !data->rpc_done)
1937                 goto out_free;
1938         /* In case we need an open_confirm, no cleanup! */
1939         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1940                 goto out_free;
1941         state = nfs4_opendata_to_nfs4_state(data);
1942         if (!IS_ERR(state))
1943                 nfs4_close_state(state, data->o_arg.fmode);
1944 out_free:
1945         nfs4_opendata_put(data);
1946 }
1947
1948 static const struct rpc_call_ops nfs4_open_ops = {
1949         .rpc_call_prepare = nfs4_open_prepare,
1950         .rpc_call_done = nfs4_open_done,
1951         .rpc_release = nfs4_open_release,
1952 };
1953
1954 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1955 {
1956         struct inode *dir = d_inode(data->dir);
1957         struct nfs_server *server = NFS_SERVER(dir);
1958         struct nfs_openargs *o_arg = &data->o_arg;
1959         struct nfs_openres *o_res = &data->o_res;
1960         struct rpc_task *task;
1961         struct rpc_message msg = {
1962                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1963                 .rpc_argp = o_arg,
1964                 .rpc_resp = o_res,
1965                 .rpc_cred = data->owner->so_cred,
1966         };
1967         struct rpc_task_setup task_setup_data = {
1968                 .rpc_client = server->client,
1969                 .rpc_message = &msg,
1970                 .callback_ops = &nfs4_open_ops,
1971                 .callback_data = data,
1972                 .workqueue = nfsiod_workqueue,
1973                 .flags = RPC_TASK_ASYNC,
1974         };
1975         int status;
1976
1977         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1978         kref_get(&data->kref);
1979         data->rpc_done = 0;
1980         data->rpc_status = 0;
1981         data->cancelled = 0;
1982         data->is_recover = 0;
1983         if (isrecover) {
1984                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1985                 data->is_recover = 1;
1986         }
1987         task = rpc_run_task(&task_setup_data);
1988         if (IS_ERR(task))
1989                 return PTR_ERR(task);
1990         status = nfs4_wait_for_completion_rpc_task(task);
1991         if (status != 0) {
1992                 data->cancelled = 1;
1993                 smp_wmb();
1994         } else
1995                 status = data->rpc_status;
1996         rpc_put_task(task);
1997
1998         return status;
1999 }
2000
2001 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2002 {
2003         struct inode *dir = d_inode(data->dir);
2004         struct nfs_openres *o_res = &data->o_res;
2005         int status;
2006
2007         status = nfs4_run_open_task(data, 1);
2008         if (status != 0 || !data->rpc_done)
2009                 return status;
2010
2011         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2012
2013         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2014                 status = _nfs4_proc_open_confirm(data);
2015                 if (status != 0)
2016                         return status;
2017         }
2018
2019         return status;
2020 }
2021
2022 /*
2023  * Additional permission checks in order to distinguish between an
2024  * open for read, and an open for execute. This works around the
2025  * fact that NFSv4 OPEN treats read and execute permissions as being
2026  * the same.
2027  * Note that in the non-execute case, we want to turn off permission
2028  * checking if we just created a new file (POSIX open() semantics).
2029  */
2030 static int nfs4_opendata_access(struct rpc_cred *cred,
2031                                 struct nfs4_opendata *opendata,
2032                                 struct nfs4_state *state, fmode_t fmode,
2033                                 int openflags)
2034 {
2035         struct nfs_access_entry cache;
2036         u32 mask;
2037
2038         /* access call failed or for some reason the server doesn't
2039          * support any access modes -- defer access call until later */
2040         if (opendata->o_res.access_supported == 0)
2041                 return 0;
2042
2043         mask = 0;
2044         /*
2045          * Use openflags to check for exec, because fmode won't
2046          * always have FMODE_EXEC set when file open for exec.
2047          */
2048         if (openflags & __FMODE_EXEC) {
2049                 /* ONLY check for exec rights */
2050                 mask = MAY_EXEC;
2051         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2052                 mask = MAY_READ;
2053
2054         cache.cred = cred;
2055         cache.jiffies = jiffies;
2056         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2057         nfs_access_add_cache(state->inode, &cache);
2058
2059         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2060                 return 0;
2061
2062         /* even though OPEN succeeded, access is denied. Close the file */
2063         nfs4_close_state(state, fmode);
2064         return -EACCES;
2065 }
2066
2067 /*
2068  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2069  */
2070 static int _nfs4_proc_open(struct nfs4_opendata *data)
2071 {
2072         struct inode *dir = d_inode(data->dir);
2073         struct nfs_server *server = NFS_SERVER(dir);
2074         struct nfs_openargs *o_arg = &data->o_arg;
2075         struct nfs_openres *o_res = &data->o_res;
2076         int status;
2077
2078         status = nfs4_run_open_task(data, 0);
2079         if (!data->rpc_done)
2080                 return status;
2081         if (status != 0) {
2082                 if (status == -NFS4ERR_BADNAME &&
2083                                 !(o_arg->open_flags & O_CREAT))
2084                         return -ENOENT;
2085                 return status;
2086         }
2087
2088         nfs_fattr_map_and_free_names(server, &data->f_attr);
2089
2090         if (o_arg->open_flags & O_CREAT) {
2091                 update_changeattr(dir, &o_res->cinfo);
2092                 if (o_arg->open_flags & O_EXCL)
2093                         data->file_created = 1;
2094                 else if (o_res->cinfo.before != o_res->cinfo.after)
2095                         data->file_created = 1;
2096         }
2097         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2098                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2099         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2100                 status = _nfs4_proc_open_confirm(data);
2101                 if (status != 0)
2102                         return status;
2103         }
2104         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2105                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2106         return 0;
2107 }
2108
2109 static int nfs4_recover_expired_lease(struct nfs_server *server)
2110 {
2111         return nfs4_client_recover_expired_lease(server->nfs_client);
2112 }
2113
2114 /*
2115  * OPEN_EXPIRED:
2116  *      reclaim state on the server after a network partition.
2117  *      Assumes caller holds the appropriate lock
2118  */
2119 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2120 {
2121         struct nfs4_opendata *opendata;
2122         int ret;
2123
2124         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2125                         NFS4_OPEN_CLAIM_FH);
2126         if (IS_ERR(opendata))
2127                 return PTR_ERR(opendata);
2128         ret = nfs4_open_recover(opendata, state);
2129         if (ret == -ESTALE)
2130                 d_drop(ctx->dentry);
2131         nfs4_opendata_put(opendata);
2132         return ret;
2133 }
2134
2135 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2136 {
2137         struct nfs_server *server = NFS_SERVER(state->inode);
2138         struct nfs4_exception exception = { };
2139         int err;
2140
2141         do {
2142                 err = _nfs4_open_expired(ctx, state);
2143                 trace_nfs4_open_expired(ctx, 0, err);
2144                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2145                         continue;
2146                 switch (err) {
2147                 default:
2148                         goto out;
2149                 case -NFS4ERR_GRACE:
2150                 case -NFS4ERR_DELAY:
2151                         nfs4_handle_exception(server, err, &exception);
2152                         err = 0;
2153                 }
2154         } while (exception.retry);
2155 out:
2156         return err;
2157 }
2158
2159 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2160 {
2161         struct nfs_open_context *ctx;
2162         int ret;
2163
2164         ctx = nfs4_state_find_open_context(state);
2165         if (IS_ERR(ctx))
2166                 return -EAGAIN;
2167         ret = nfs4_do_open_expired(ctx, state);
2168         put_nfs_open_context(ctx);
2169         return ret;
2170 }
2171
2172 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2173 {
2174         nfs_remove_bad_delegation(state->inode);
2175         write_seqlock(&state->seqlock);
2176         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2177         write_sequnlock(&state->seqlock);
2178         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2179 }
2180
2181 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2182 {
2183         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2184                 nfs_finish_clear_delegation_stateid(state);
2185 }
2186
2187 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2188 {
2189         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2190         nfs40_clear_delegation_stateid(state);
2191         return nfs4_open_expired(sp, state);
2192 }
2193
2194 #if defined(CONFIG_NFS_V4_1)
2195 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2196 {
2197         struct nfs_server *server = NFS_SERVER(state->inode);
2198         nfs4_stateid stateid;
2199         struct nfs_delegation *delegation;
2200         struct rpc_cred *cred;
2201         int status;
2202
2203         /* Get the delegation credential for use by test/free_stateid */
2204         rcu_read_lock();
2205         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2206         if (delegation == NULL) {
2207                 rcu_read_unlock();
2208                 return;
2209         }
2210
2211         nfs4_stateid_copy(&stateid, &delegation->stateid);
2212         cred = get_rpccred(delegation->cred);
2213         rcu_read_unlock();
2214         status = nfs41_test_stateid(server, &stateid, cred);
2215         trace_nfs4_test_delegation_stateid(state, NULL, status);
2216
2217         if (status != NFS_OK) {
2218                 /* Free the stateid unless the server explicitly
2219                  * informs us the stateid is unrecognized. */
2220                 if (status != -NFS4ERR_BAD_STATEID)
2221                         nfs41_free_stateid(server, &stateid, cred);
2222                 nfs_finish_clear_delegation_stateid(state);
2223         }
2224
2225         put_rpccred(cred);
2226 }
2227
2228 /**
2229  * nfs41_check_open_stateid - possibly free an open stateid
2230  *
2231  * @state: NFSv4 state for an inode
2232  *
2233  * Returns NFS_OK if recovery for this stateid is now finished.
2234  * Otherwise a negative NFS4ERR value is returned.
2235  */
2236 static int nfs41_check_open_stateid(struct nfs4_state *state)
2237 {
2238         struct nfs_server *server = NFS_SERVER(state->inode);
2239         nfs4_stateid *stateid = &state->open_stateid;
2240         struct rpc_cred *cred = state->owner->so_cred;
2241         int status;
2242
2243         /* If a state reset has been done, test_stateid is unneeded */
2244         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2245             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2246             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2247                 return -NFS4ERR_BAD_STATEID;
2248
2249         status = nfs41_test_stateid(server, stateid, cred);
2250         trace_nfs4_test_open_stateid(state, NULL, status);
2251         if (status != NFS_OK) {
2252                 /* Free the stateid unless the server explicitly
2253                  * informs us the stateid is unrecognized. */
2254                 if (status != -NFS4ERR_BAD_STATEID)
2255                         nfs41_free_stateid(server, stateid, cred);
2256
2257                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2258                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2259                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2260                 clear_bit(NFS_OPEN_STATE, &state->flags);
2261         }
2262         return status;
2263 }
2264
2265 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2266 {
2267         int status;
2268
2269         nfs41_check_delegation_stateid(state);
2270         status = nfs41_check_open_stateid(state);
2271         if (status != NFS_OK)
2272                 status = nfs4_open_expired(sp, state);
2273         return status;
2274 }
2275 #endif
2276
2277 /*
2278  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2279  * fields corresponding to attributes that were used to store the verifier.
2280  * Make sure we clobber those fields in the later setattr call
2281  */
2282 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2283 {
2284         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2285             !(sattr->ia_valid & ATTR_ATIME_SET))
2286                 sattr->ia_valid |= ATTR_ATIME;
2287
2288         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2289             !(sattr->ia_valid & ATTR_MTIME_SET))
2290                 sattr->ia_valid |= ATTR_MTIME;
2291 }
2292
2293 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2294                 fmode_t fmode,
2295                 int flags,
2296                 struct nfs_open_context *ctx)
2297 {
2298         struct nfs4_state_owner *sp = opendata->owner;
2299         struct nfs_server *server = sp->so_server;
2300         struct dentry *dentry;
2301         struct nfs4_state *state;
2302         unsigned int seq;
2303         int ret;
2304
2305         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2306
2307         ret = _nfs4_proc_open(opendata);
2308         if (ret != 0)
2309                 goto out;
2310
2311         state = nfs4_opendata_to_nfs4_state(opendata);
2312         ret = PTR_ERR(state);
2313         if (IS_ERR(state))
2314                 goto out;
2315         if (server->caps & NFS_CAP_POSIX_LOCK)
2316                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2317
2318         dentry = opendata->dentry;
2319         if (d_really_is_negative(dentry)) {
2320                 /* FIXME: Is this d_drop() ever needed? */
2321                 d_drop(dentry);
2322                 dentry = d_add_unique(dentry, igrab(state->inode));
2323                 if (dentry == NULL) {
2324                         dentry = opendata->dentry;
2325                 } else if (dentry != ctx->dentry) {
2326                         dput(ctx->dentry);
2327                         ctx->dentry = dget(dentry);
2328                 }
2329                 nfs_set_verifier(dentry,
2330                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2331         }
2332
2333         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2334         if (ret != 0)
2335                 goto out;
2336
2337         ctx->state = state;
2338         if (d_inode(dentry) == state->inode) {
2339                 nfs_inode_attach_open_context(ctx);
2340                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2341                         nfs4_schedule_stateid_recovery(server, state);
2342         }
2343 out:
2344         return ret;
2345 }
2346
2347 /*
2348  * Returns a referenced nfs4_state
2349  */
2350 static int _nfs4_do_open(struct inode *dir,
2351                         struct nfs_open_context *ctx,
2352                         int flags,
2353                         struct iattr *sattr,
2354                         struct nfs4_label *label,
2355                         int *opened)
2356 {
2357         struct nfs4_state_owner  *sp;
2358         struct nfs4_state     *state = NULL;
2359         struct nfs_server       *server = NFS_SERVER(dir);
2360         struct nfs4_opendata *opendata;
2361         struct dentry *dentry = ctx->dentry;
2362         struct rpc_cred *cred = ctx->cred;
2363         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2364         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2365         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2366         struct nfs4_label *olabel = NULL;
2367         int status;
2368
2369         /* Protect against reboot recovery conflicts */
2370         status = -ENOMEM;
2371         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2372         if (sp == NULL) {
2373                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2374                 goto out_err;
2375         }
2376         status = nfs4_recover_expired_lease(server);
2377         if (status != 0)
2378                 goto err_put_state_owner;
2379         if (d_really_is_positive(dentry))
2380                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2381         status = -ENOMEM;
2382         if (d_really_is_positive(dentry))
2383                 claim = NFS4_OPEN_CLAIM_FH;
2384         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2385                         label, claim, GFP_KERNEL);
2386         if (opendata == NULL)
2387                 goto err_put_state_owner;
2388
2389         if (label) {
2390                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2391                 if (IS_ERR(olabel)) {
2392                         status = PTR_ERR(olabel);
2393                         goto err_opendata_put;
2394                 }
2395         }
2396
2397         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2398                 if (!opendata->f_attr.mdsthreshold) {
2399                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2400                         if (!opendata->f_attr.mdsthreshold)
2401                                 goto err_free_label;
2402                 }
2403                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2404         }
2405         if (d_really_is_positive(dentry))
2406                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2407
2408         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2409         if (status != 0)
2410                 goto err_free_label;
2411         state = ctx->state;
2412
2413         if ((opendata->o_arg.open_flags & O_EXCL) &&
2414             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2415                 nfs4_exclusive_attrset(opendata, sattr);
2416
2417                 nfs_fattr_init(opendata->o_res.f_attr);
2418                 status = nfs4_do_setattr(state->inode, cred,
2419                                 opendata->o_res.f_attr, sattr,
2420                                 state, label, olabel);
2421                 if (status == 0) {
2422                         nfs_setattr_update_inode(state->inode, sattr,
2423                                         opendata->o_res.f_attr);
2424                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2425                 }
2426         }
2427         if (opendata->file_created)
2428                 *opened |= FILE_CREATED;
2429
2430         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2431                 *ctx_th = opendata->f_attr.mdsthreshold;
2432                 opendata->f_attr.mdsthreshold = NULL;
2433         }
2434
2435         nfs4_label_free(olabel);
2436
2437         nfs4_opendata_put(opendata);
2438         nfs4_put_state_owner(sp);
2439         return 0;
2440 err_free_label:
2441         nfs4_label_free(olabel);
2442 err_opendata_put:
2443         nfs4_opendata_put(opendata);
2444 err_put_state_owner:
2445         nfs4_put_state_owner(sp);
2446 out_err:
2447         return status;
2448 }
2449
2450
2451 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2452                                         struct nfs_open_context *ctx,
2453                                         int flags,
2454                                         struct iattr *sattr,
2455                                         struct nfs4_label *label,
2456                                         int *opened)
2457 {
2458         struct nfs_server *server = NFS_SERVER(dir);
2459         struct nfs4_exception exception = { };
2460         struct nfs4_state *res;
2461         int status;
2462
2463         do {
2464                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2465                 res = ctx->state;
2466                 trace_nfs4_open_file(ctx, flags, status);
2467                 if (status == 0)
2468                         break;
2469                 /* NOTE: BAD_SEQID means the server and client disagree about the
2470                  * book-keeping w.r.t. state-changing operations
2471                  * (OPEN/CLOSE/LOCK/LOCKU...)
2472                  * It is actually a sign of a bug on the client or on the server.
2473                  *
2474                  * If we receive a BAD_SEQID error in the particular case of
2475                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2476                  * have unhashed the old state_owner for us, and that we can
2477                  * therefore safely retry using a new one. We should still warn
2478                  * the user though...
2479                  */
2480                 if (status == -NFS4ERR_BAD_SEQID) {
2481                         pr_warn_ratelimited("NFS: v4 server %s "
2482                                         " returned a bad sequence-id error!\n",
2483                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2484                         exception.retry = 1;
2485                         continue;
2486                 }
2487                 /*
2488                  * BAD_STATEID on OPEN means that the server cancelled our
2489                  * state before it received the OPEN_CONFIRM.
2490                  * Recover by retrying the request as per the discussion
2491                  * on Page 181 of RFC3530.
2492                  */
2493                 if (status == -NFS4ERR_BAD_STATEID) {
2494                         exception.retry = 1;
2495                         continue;
2496                 }
2497                 if (status == -EAGAIN) {
2498                         /* We must have found a delegation */
2499                         exception.retry = 1;
2500                         continue;
2501                 }
2502                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2503                         continue;
2504                 res = ERR_PTR(nfs4_handle_exception(server,
2505                                         status, &exception));
2506         } while (exception.retry);
2507         return res;
2508 }
2509
2510 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2511                             struct nfs_fattr *fattr, struct iattr *sattr,
2512                             struct nfs4_state *state, struct nfs4_label *ilabel,
2513                             struct nfs4_label *olabel)
2514 {
2515         struct nfs_server *server = NFS_SERVER(inode);
2516         struct nfs_setattrargs  arg = {
2517                 .fh             = NFS_FH(inode),
2518                 .iap            = sattr,
2519                 .server         = server,
2520                 .bitmask = server->attr_bitmask,
2521                 .label          = ilabel,
2522         };
2523         struct nfs_setattrres  res = {
2524                 .fattr          = fattr,
2525                 .label          = olabel,
2526                 .server         = server,
2527         };
2528         struct rpc_message msg = {
2529                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2530                 .rpc_argp       = &arg,
2531                 .rpc_resp       = &res,
2532                 .rpc_cred       = cred,
2533         };
2534         unsigned long timestamp = jiffies;
2535         fmode_t fmode;
2536         bool truncate;
2537         int status;
2538
2539         arg.bitmask = nfs4_bitmask(server, ilabel);
2540         if (ilabel)
2541                 arg.bitmask = nfs4_bitmask(server, olabel);
2542
2543         nfs_fattr_init(fattr);
2544
2545         /* Servers should only apply open mode checks for file size changes */
2546         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2547         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2548
2549         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2550                 /* Use that stateid */
2551         } else if (truncate && state != NULL) {
2552                 struct nfs_lockowner lockowner = {
2553                         .l_owner = current->files,
2554                         .l_pid = current->tgid,
2555                 };
2556                 if (!nfs4_valid_open_stateid(state))
2557                         return -EBADF;
2558                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2559                                 &lockowner) == -EIO)
2560                         return -EBADF;
2561         } else
2562                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2563
2564         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2565         if (status == 0 && state != NULL)
2566                 renew_lease(server, timestamp);
2567         return status;
2568 }
2569
2570 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2571                            struct nfs_fattr *fattr, struct iattr *sattr,
2572                            struct nfs4_state *state, struct nfs4_label *ilabel,
2573                            struct nfs4_label *olabel)
2574 {
2575         struct nfs_server *server = NFS_SERVER(inode);
2576         struct nfs4_exception exception = {
2577                 .state = state,
2578                 .inode = inode,
2579         };
2580         int err;
2581         do {
2582                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2583                 trace_nfs4_setattr(inode, err);
2584                 switch (err) {
2585                 case -NFS4ERR_OPENMODE:
2586                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2587                                 pr_warn_once("NFSv4: server %s is incorrectly "
2588                                                 "applying open mode checks to "
2589                                                 "a SETATTR that is not "
2590                                                 "changing file size.\n",
2591                                                 server->nfs_client->cl_hostname);
2592                         }
2593                         if (state && !(state->state & FMODE_WRITE)) {
2594                                 err = -EBADF;
2595                                 if (sattr->ia_valid & ATTR_OPEN)
2596                                         err = -EACCES;
2597                                 goto out;
2598                         }
2599                 }
2600                 err = nfs4_handle_exception(server, err, &exception);
2601         } while (exception.retry);
2602 out:
2603         return err;
2604 }
2605
2606 struct nfs4_closedata {
2607         struct inode *inode;
2608         struct nfs4_state *state;
2609         struct nfs_closeargs arg;
2610         struct nfs_closeres res;
2611         struct nfs_fattr fattr;
2612         unsigned long timestamp;
2613         bool roc;
2614         u32 roc_barrier;
2615 };
2616
2617 static void nfs4_free_closedata(void *data)
2618 {
2619         struct nfs4_closedata *calldata = data;
2620         struct nfs4_state_owner *sp = calldata->state->owner;
2621         struct super_block *sb = calldata->state->inode->i_sb;
2622
2623         if (calldata->roc)
2624                 pnfs_roc_release(calldata->state->inode);
2625         nfs4_put_open_state(calldata->state);
2626         nfs_free_seqid(calldata->arg.seqid);
2627         nfs4_put_state_owner(sp);
2628         nfs_sb_deactive(sb);
2629         kfree(calldata);
2630 }
2631
2632 static void nfs4_close_done(struct rpc_task *task, void *data)
2633 {
2634         struct nfs4_closedata *calldata = data;
2635         struct nfs4_state *state = calldata->state;
2636         struct nfs_server *server = NFS_SERVER(calldata->inode);
2637         nfs4_stateid *res_stateid = NULL;
2638
2639         dprintk("%s: begin!\n", __func__);
2640         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2641                 return;
2642         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2643         /* hmm. we are done with the inode, and in the process of freeing
2644          * the state_owner. we keep this around to process errors
2645          */
2646         switch (task->tk_status) {
2647                 case 0:
2648                         res_stateid = &calldata->res.stateid;
2649                         if (calldata->arg.fmode == 0 && calldata->roc)
2650                                 pnfs_roc_set_barrier(state->inode,
2651                                                      calldata->roc_barrier);
2652                         renew_lease(server, calldata->timestamp);
2653                         break;
2654                 case -NFS4ERR_ADMIN_REVOKED:
2655                 case -NFS4ERR_STALE_STATEID:
2656                 case -NFS4ERR_OLD_STATEID:
2657                 case -NFS4ERR_BAD_STATEID:
2658                 case -NFS4ERR_EXPIRED:
2659                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2660                                                 &state->open_stateid)) {
2661                                 rpc_restart_call_prepare(task);
2662                                 goto out_release;
2663                         }
2664                         if (calldata->arg.fmode == 0)
2665                                 break;
2666                 default:
2667                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2668                                 rpc_restart_call_prepare(task);
2669                                 goto out_release;
2670                         }
2671         }
2672         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2673 out_release:
2674         nfs_release_seqid(calldata->arg.seqid);
2675         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2676         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2677 }
2678
2679 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2680 {
2681         struct nfs4_closedata *calldata = data;
2682         struct nfs4_state *state = calldata->state;
2683         struct inode *inode = calldata->inode;
2684         bool is_rdonly, is_wronly, is_rdwr;
2685         int call_close = 0;
2686
2687         dprintk("%s: begin!\n", __func__);
2688         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2689                 goto out_wait;
2690
2691         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2692         spin_lock(&state->owner->so_lock);
2693         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2694         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2695         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2696         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2697         /* Calculate the change in open mode */
2698         calldata->arg.fmode = 0;
2699         if (state->n_rdwr == 0) {
2700                 if (state->n_rdonly == 0)
2701                         call_close |= is_rdonly;
2702                 else if (is_rdonly)
2703                         calldata->arg.fmode |= FMODE_READ;
2704                 if (state->n_wronly == 0)
2705                         call_close |= is_wronly;
2706                 else if (is_wronly)
2707                         calldata->arg.fmode |= FMODE_WRITE;
2708         } else if (is_rdwr)
2709                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2710
2711         if (calldata->arg.fmode == 0)
2712                 call_close |= is_rdwr;
2713
2714         if (!nfs4_valid_open_stateid(state))
2715                 call_close = 0;
2716         spin_unlock(&state->owner->so_lock);
2717
2718         if (!call_close) {
2719                 /* Note: exit _without_ calling nfs4_close_done */
2720                 goto out_no_action;
2721         }
2722
2723         if (calldata->arg.fmode == 0) {
2724                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2725                 if (calldata->roc &&
2726                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2727                         nfs_release_seqid(calldata->arg.seqid);
2728                         goto out_wait;
2729                     }
2730         }
2731         calldata->arg.share_access =
2732                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2733                                 calldata->arg.fmode, 0);
2734
2735         nfs_fattr_init(calldata->res.fattr);
2736         calldata->timestamp = jiffies;
2737         if (nfs4_setup_sequence(NFS_SERVER(inode),
2738                                 &calldata->arg.seq_args,
2739                                 &calldata->res.seq_res,
2740                                 task) != 0)
2741                 nfs_release_seqid(calldata->arg.seqid);
2742         dprintk("%s: done!\n", __func__);
2743         return;
2744 out_no_action:
2745         task->tk_action = NULL;
2746 out_wait:
2747         nfs4_sequence_done(task, &calldata->res.seq_res);
2748 }
2749
2750 static const struct rpc_call_ops nfs4_close_ops = {
2751         .rpc_call_prepare = nfs4_close_prepare,
2752         .rpc_call_done = nfs4_close_done,
2753         .rpc_release = nfs4_free_closedata,
2754 };
2755
2756 static bool nfs4_roc(struct inode *inode)
2757 {
2758         if (!nfs_have_layout(inode))
2759                 return false;
2760         return pnfs_roc(inode);
2761 }
2762
2763 /*
2764  * It is possible for data to be read/written from a mem-mapped file
2765  * after the sys_close call (which hits the vfs layer as a flush).
2766  * This means that we can't safely call nfsv4 close on a file until
2767  * the inode is cleared. This in turn means that we are not good
2768  * NFSv4 citizens - we do not indicate to the server to update the file's
2769  * share state even when we are done with one of the three share
2770  * stateid's in the inode.
2771  *
2772  * NOTE: Caller must be holding the sp->so_owner semaphore!
2773  */
2774 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2775 {
2776         struct nfs_server *server = NFS_SERVER(state->inode);
2777         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2778         struct nfs4_closedata *calldata;
2779         struct nfs4_state_owner *sp = state->owner;
2780         struct rpc_task *task;
2781         struct rpc_message msg = {
2782                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2783                 .rpc_cred = state->owner->so_cred,
2784         };
2785         struct rpc_task_setup task_setup_data = {
2786                 .rpc_client = server->client,
2787                 .rpc_message = &msg,
2788                 .callback_ops = &nfs4_close_ops,
2789                 .workqueue = nfsiod_workqueue,
2790                 .flags = RPC_TASK_ASYNC,
2791         };
2792         int status = -ENOMEM;
2793
2794         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2795                 &task_setup_data.rpc_client, &msg);
2796
2797         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2798         if (calldata == NULL)
2799                 goto out;
2800         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2801         calldata->inode = state->inode;
2802         calldata->state = state;
2803         calldata->arg.fh = NFS_FH(state->inode);
2804         /* Serialization for the sequence id */
2805         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2806         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2807         if (IS_ERR(calldata->arg.seqid))
2808                 goto out_free_calldata;
2809         calldata->arg.fmode = 0;
2810         calldata->arg.bitmask = server->cache_consistency_bitmask;
2811         calldata->res.fattr = &calldata->fattr;
2812         calldata->res.seqid = calldata->arg.seqid;
2813         calldata->res.server = server;
2814         calldata->roc = nfs4_roc(state->inode);
2815         nfs_sb_active(calldata->inode->i_sb);
2816
2817         msg.rpc_argp = &calldata->arg;
2818         msg.rpc_resp = &calldata->res;
2819         task_setup_data.callback_data = calldata;
2820         task = rpc_run_task(&task_setup_data);
2821         if (IS_ERR(task))
2822                 return PTR_ERR(task);
2823         status = 0;
2824         if (wait)
2825                 status = rpc_wait_for_completion_task(task);
2826         rpc_put_task(task);
2827         return status;
2828 out_free_calldata:
2829         kfree(calldata);
2830 out:
2831         nfs4_put_open_state(state);
2832         nfs4_put_state_owner(sp);
2833         return status;
2834 }
2835
2836 static struct inode *
2837 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2838                 int open_flags, struct iattr *attr, int *opened)
2839 {
2840         struct nfs4_state *state;
2841         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2842
2843         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2844
2845         /* Protect against concurrent sillydeletes */
2846         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2847
2848         nfs4_label_release_security(label);
2849
2850         if (IS_ERR(state))
2851                 return ERR_CAST(state);
2852         return state->inode;
2853 }
2854
2855 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2856 {
2857         if (ctx->state == NULL)
2858                 return;
2859         if (is_sync)
2860                 nfs4_close_sync(ctx->state, ctx->mode);
2861         else
2862                 nfs4_close_state(ctx->state, ctx->mode);
2863 }
2864
2865 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2866 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2867 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2868
2869 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2870 {
2871         struct nfs4_server_caps_arg args = {
2872                 .fhandle = fhandle,
2873         };
2874         struct nfs4_server_caps_res res = {};
2875         struct rpc_message msg = {
2876                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2877                 .rpc_argp = &args,
2878                 .rpc_resp = &res,
2879         };
2880         int status;
2881
2882         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2883         if (status == 0) {
2884                 /* Sanity check the server answers */
2885                 switch (server->nfs_client->cl_minorversion) {
2886                 case 0:
2887                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2888                         res.attr_bitmask[2] = 0;
2889                         break;
2890                 case 1:
2891                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2892                         break;
2893                 case 2:
2894                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2895                 }
2896                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2897                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2898                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2899                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2900                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2901                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2902                                 NFS_CAP_SECURITY_LABEL);
2903                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2904                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2905                         server->caps |= NFS_CAP_ACLS;
2906                 if (res.has_links != 0)
2907                         server->caps |= NFS_CAP_HARDLINKS;
2908                 if (res.has_symlinks != 0)
2909                         server->caps |= NFS_CAP_SYMLINKS;
2910                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2911                         server->caps |= NFS_CAP_FILEID;
2912                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2913                         server->caps |= NFS_CAP_MODE;
2914                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2915                         server->caps |= NFS_CAP_NLINK;
2916                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2917                         server->caps |= NFS_CAP_OWNER;
2918                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2919                         server->caps |= NFS_CAP_OWNER_GROUP;
2920                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2921                         server->caps |= NFS_CAP_ATIME;
2922                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2923                         server->caps |= NFS_CAP_CTIME;
2924                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2925                         server->caps |= NFS_CAP_MTIME;
2926 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2927                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2928                         server->caps |= NFS_CAP_SECURITY_LABEL;
2929 #endif
2930                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2931                                 sizeof(server->attr_bitmask));
2932                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2933
2934                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2935                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2936                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2937                 server->cache_consistency_bitmask[2] = 0;
2938                 server->acl_bitmask = res.acl_bitmask;
2939                 server->fh_expire_type = res.fh_expire_type;
2940         }
2941
2942         return status;
2943 }
2944
2945 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2946 {
2947         struct nfs4_exception exception = { };
2948         int err;
2949         do {
2950                 err = nfs4_handle_exception(server,
2951                                 _nfs4_server_capabilities(server, fhandle),
2952                                 &exception);
2953         } while (exception.retry);
2954         return err;
2955 }
2956
2957 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2958                 struct nfs_fsinfo *info)
2959 {
2960         u32 bitmask[3];
2961         struct nfs4_lookup_root_arg args = {
2962                 .bitmask = bitmask,
2963         };
2964         struct nfs4_lookup_res res = {
2965                 .server = server,
2966                 .fattr = info->fattr,
2967                 .fh = fhandle,
2968         };
2969         struct rpc_message msg = {
2970                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2971                 .rpc_argp = &args,
2972                 .rpc_resp = &res,
2973         };
2974
2975         bitmask[0] = nfs4_fattr_bitmap[0];
2976         bitmask[1] = nfs4_fattr_bitmap[1];
2977         /*
2978          * Process the label in the upcoming getfattr
2979          */
2980         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2981
2982         nfs_fattr_init(info->fattr);
2983         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2984 }
2985
2986 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2987                 struct nfs_fsinfo *info)
2988 {
2989         struct nfs4_exception exception = { };
2990         int err;
2991         do {
2992                 err = _nfs4_lookup_root(server, fhandle, info);
2993                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2994                 switch (err) {
2995                 case 0:
2996                 case -NFS4ERR_WRONGSEC:
2997                         goto out;
2998                 default:
2999                         err = nfs4_handle_exception(server, err, &exception);
3000                 }
3001         } while (exception.retry);
3002 out:
3003         return err;
3004 }
3005
3006 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3007                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3008 {
3009         struct rpc_auth_create_args auth_args = {
3010                 .pseudoflavor = flavor,
3011         };
3012         struct rpc_auth *auth;
3013         int ret;
3014
3015         auth = rpcauth_create(&auth_args, server->client);
3016         if (IS_ERR(auth)) {
3017                 ret = -EACCES;
3018                 goto out;
3019         }
3020         ret = nfs4_lookup_root(server, fhandle, info);
3021 out:
3022         return ret;
3023 }
3024
3025 /*
3026  * Retry pseudoroot lookup with various security flavors.  We do this when:
3027  *
3028  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3029  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3030  *
3031  * Returns zero on success, or a negative NFS4ERR value, or a
3032  * negative errno value.
3033  */
3034 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3035                               struct nfs_fsinfo *info)
3036 {
3037         /* Per 3530bis 15.33.5 */
3038         static const rpc_authflavor_t flav_array[] = {
3039                 RPC_AUTH_GSS_KRB5P,
3040                 RPC_AUTH_GSS_KRB5I,
3041                 RPC_AUTH_GSS_KRB5,
3042                 RPC_AUTH_UNIX,                  /* courtesy */
3043                 RPC_AUTH_NULL,
3044         };
3045         int status = -EPERM;
3046         size_t i;
3047
3048         if (server->auth_info.flavor_len > 0) {
3049                 /* try each flavor specified by user */
3050                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3051                         status = nfs4_lookup_root_sec(server, fhandle, info,
3052                                                 server->auth_info.flavors[i]);
3053                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3054                                 continue;
3055                         break;
3056                 }
3057         } else {
3058                 /* no flavors specified by user, try default list */
3059                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3060                         status = nfs4_lookup_root_sec(server, fhandle, info,
3061                                                       flav_array[i]);
3062                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3063                                 continue;
3064                         break;
3065                 }
3066         }
3067
3068         /*
3069          * -EACCESS could mean that the user doesn't have correct permissions
3070          * to access the mount.  It could also mean that we tried to mount
3071          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3072          * existing mount programs don't handle -EACCES very well so it should
3073          * be mapped to -EPERM instead.
3074          */
3075         if (status == -EACCES)
3076                 status = -EPERM;
3077         return status;
3078 }
3079
3080 static int nfs4_do_find_root_sec(struct nfs_server *server,
3081                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3082 {
3083         int mv = server->nfs_client->cl_minorversion;
3084         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3085 }
3086
3087 /**
3088  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3089  * @server: initialized nfs_server handle
3090  * @fhandle: we fill in the pseudo-fs root file handle
3091  * @info: we fill in an FSINFO struct
3092  * @auth_probe: probe the auth flavours
3093  *
3094  * Returns zero on success, or a negative errno.
3095  */
3096 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3097                          struct nfs_fsinfo *info,
3098                          bool auth_probe)
3099 {
3100         int status = 0;
3101
3102         if (!auth_probe)
3103                 status = nfs4_lookup_root(server, fhandle, info);
3104
3105         if (auth_probe || status == NFS4ERR_WRONGSEC)
3106                 status = nfs4_do_find_root_sec(server, fhandle, info);
3107
3108         if (status == 0)
3109                 status = nfs4_server_capabilities(server, fhandle);
3110         if (status == 0)
3111                 status = nfs4_do_fsinfo(server, fhandle, info);
3112
3113         return nfs4_map_errors(status);
3114 }
3115
3116 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3117                               struct nfs_fsinfo *info)
3118 {
3119         int error;
3120         struct nfs_fattr *fattr = info->fattr;
3121         struct nfs4_label *label = NULL;
3122
3123         error = nfs4_server_capabilities(server, mntfh);
3124         if (error < 0) {
3125                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3126                 return error;
3127         }
3128
3129         label = nfs4_label_alloc(server, GFP_KERNEL);
3130         if (IS_ERR(label))
3131                 return PTR_ERR(label);
3132
3133         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3134         if (error < 0) {
3135                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3136                 goto err_free_label;
3137         }
3138
3139         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3140             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3141                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3142
3143 err_free_label:
3144         nfs4_label_free(label);
3145
3146         return error;
3147 }
3148
3149 /*
3150  * Get locations and (maybe) other attributes of a referral.
3151  * Note that we'll actually follow the referral later when
3152  * we detect fsid mismatch in inode revalidation
3153  */
3154 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3155                              const struct qstr *name, struct nfs_fattr *fattr,
3156                              struct nfs_fh *fhandle)
3157 {
3158         int status = -ENOMEM;
3159         struct page *page = NULL;
3160         struct nfs4_fs_locations *locations = NULL;
3161
3162         page = alloc_page(GFP_KERNEL);
3163         if (page == NULL)
3164                 goto out;
3165         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3166         if (locations == NULL)
3167                 goto out;
3168
3169         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3170         if (status != 0)
3171                 goto out;
3172
3173         /*
3174          * If the fsid didn't change, this is a migration event, not a
3175          * referral.  Cause us to drop into the exception handler, which
3176          * will kick off migration recovery.
3177          */
3178         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3179                 dprintk("%s: server did not return a different fsid for"
3180                         " a referral at %s\n", __func__, name->name);
3181                 status = -NFS4ERR_MOVED;
3182                 goto out;
3183         }
3184         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3185         nfs_fixup_referral_attributes(&locations->fattr);
3186
3187         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3188         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3189         memset(fhandle, 0, sizeof(struct nfs_fh));
3190 out:
3191         if (page)
3192                 __free_page(page);
3193         kfree(locations);
3194         return status;
3195 }
3196
3197 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3198                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3199 {
3200         struct nfs4_getattr_arg args = {
3201                 .fh = fhandle,
3202                 .bitmask = server->attr_bitmask,
3203         };
3204         struct nfs4_getattr_res res = {
3205                 .fattr = fattr,
3206                 .label = label,
3207                 .server = server,
3208         };
3209         struct rpc_message msg = {
3210                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3211                 .rpc_argp = &args,
3212                 .rpc_resp = &res,
3213         };
3214
3215         args.bitmask = nfs4_bitmask(server, label);
3216
3217         nfs_fattr_init(fattr);
3218         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3219 }
3220
3221 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3222                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3223 {
3224         struct nfs4_exception exception = { };
3225         int err;
3226         do {
3227                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3228                 trace_nfs4_getattr(server, fhandle, fattr, err);
3229                 err = nfs4_handle_exception(server, err,
3230                                 &exception);
3231         } while (exception.retry);
3232         return err;
3233 }
3234
3235 /*
3236  * The file is not closed if it is opened due to the a request to change
3237  * the size of the file. The open call will not be needed once the
3238  * VFS layer lookup-intents are implemented.
3239  *
3240  * Close is called when the inode is destroyed.
3241  * If we haven't opened the file for O_WRONLY, we
3242  * need to in the size_change case to obtain a stateid.
3243  *
3244  * Got race?
3245  * Because OPEN is always done by name in nfsv4, it is
3246  * possible that we opened a different file by the same
3247  * name.  We can recognize this race condition, but we
3248  * can't do anything about it besides returning an error.
3249  *
3250  * This will be fixed with VFS changes (lookup-intent).
3251  */
3252 static int
3253 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3254                   struct iattr *sattr)
3255 {
3256         struct inode *inode = d_inode(dentry);
3257         struct rpc_cred *cred = NULL;
3258         struct nfs4_state *state = NULL;
3259         struct nfs4_label *label = NULL;
3260         int status;
3261
3262         if (pnfs_ld_layoutret_on_setattr(inode) &&
3263             sattr->ia_valid & ATTR_SIZE &&
3264             sattr->ia_size < i_size_read(inode))
3265                 pnfs_commit_and_return_layout(inode);
3266
3267         nfs_fattr_init(fattr);
3268
3269         /* Deal with open(O_TRUNC) */
3270         if (sattr->ia_valid & ATTR_OPEN)
3271                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3272
3273         /* Optimization: if the end result is no change, don't RPC */
3274         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3275                 return 0;
3276
3277         /* Search for an existing open(O_WRITE) file */
3278         if (sattr->ia_valid & ATTR_FILE) {
3279                 struct nfs_open_context *ctx;
3280
3281                 ctx = nfs_file_open_context(sattr->ia_file);
3282                 if (ctx) {
3283                         cred = ctx->cred;
3284                         state = ctx->state;
3285                 }
3286         }
3287
3288         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3289         if (IS_ERR(label))
3290                 return PTR_ERR(label);
3291
3292         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3293         if (status == 0) {
3294                 nfs_setattr_update_inode(inode, sattr, fattr);
3295                 nfs_setsecurity(inode, fattr, label);
3296         }
3297         nfs4_label_free(label);
3298         return status;
3299 }
3300
3301 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3302                 const struct qstr *name, struct nfs_fh *fhandle,
3303                 struct nfs_fattr *fattr, struct nfs4_label *label)
3304 {
3305         struct nfs_server *server = NFS_SERVER(dir);
3306         int                    status;
3307         struct nfs4_lookup_arg args = {
3308                 .bitmask = server->attr_bitmask,
3309                 .dir_fh = NFS_FH(dir),
3310                 .name = name,
3311         };
3312         struct nfs4_lookup_res res = {
3313                 .server = server,
3314                 .fattr = fattr,
3315                 .label = label,
3316                 .fh = fhandle,
3317         };
3318         struct rpc_message msg = {
3319                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3320                 .rpc_argp = &args,
3321                 .rpc_resp = &res,
3322         };
3323
3324         args.bitmask = nfs4_bitmask(server, label);
3325
3326         nfs_fattr_init(fattr);
3327
3328         dprintk("NFS call  lookup %s\n", name->name);
3329         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3330         dprintk("NFS reply lookup: %d\n", status);
3331         return status;
3332 }
3333
3334 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3335 {
3336         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3337                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3338         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3339         fattr->nlink = 2;
3340 }
3341
3342 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3343                                    struct qstr *name, struct nfs_fh *fhandle,
3344                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3345 {
3346         struct nfs4_exception exception = { };
3347         struct rpc_clnt *client = *clnt;
3348         int err;
3349         do {
3350                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3351                 trace_nfs4_lookup(dir, name, err);
3352                 switch (err) {
3353                 case -NFS4ERR_BADNAME:
3354                         err = -ENOENT;
3355                         goto out;
3356                 case -NFS4ERR_MOVED:
3357                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3358                         goto out;
3359                 case -NFS4ERR_WRONGSEC:
3360                         err = -EPERM;
3361                         if (client != *clnt)
3362                                 goto out;
3363                         client = nfs4_negotiate_security(client, dir, name);
3364                         if (IS_ERR(client))
3365                                 return PTR_ERR(client);
3366
3367                         exception.retry = 1;
3368                         break;
3369                 default:
3370                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3371                 }
3372         } while (exception.retry);
3373
3374 out:
3375         if (err == 0)
3376                 *clnt = client;
3377         else if (client != *clnt)
3378                 rpc_shutdown_client(client);
3379
3380         return err;
3381 }
3382
3383 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3384                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3385                             struct nfs4_label *label)
3386 {
3387         int status;
3388         struct rpc_clnt *client = NFS_CLIENT(dir);
3389
3390         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3391         if (client != NFS_CLIENT(dir)) {
3392                 rpc_shutdown_client(client);
3393                 nfs_fixup_secinfo_attributes(fattr);
3394         }
3395         return status;
3396 }
3397
3398 struct rpc_clnt *
3399 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3400                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3401 {
3402         struct rpc_clnt *client = NFS_CLIENT(dir);
3403         int status;
3404
3405         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3406         if (status < 0)
3407                 return ERR_PTR(status);
3408         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3409 }
3410
3411 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3412 {
3413         struct nfs_server *server = NFS_SERVER(inode);
3414         struct nfs4_accessargs args = {
3415                 .fh = NFS_FH(inode),
3416                 .bitmask = server->cache_consistency_bitmask,
3417         };
3418         struct nfs4_accessres res = {
3419                 .server = server,
3420         };
3421         struct rpc_message msg = {
3422                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3423                 .rpc_argp = &args,
3424                 .rpc_resp = &res,
3425                 .rpc_cred = entry->cred,
3426         };
3427         int mode = entry->mask;
3428         int status = 0;
3429
3430         /*
3431          * Determine which access bits we want to ask for...
3432          */
3433         if (mode & MAY_READ)
3434                 args.access |= NFS4_ACCESS_READ;
3435         if (S_ISDIR(inode->i_mode)) {
3436                 if (mode & MAY_WRITE)
3437                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3438                 if (mode & MAY_EXEC)
3439                         args.access |= NFS4_ACCESS_LOOKUP;
3440         } else {
3441                 if (mode & MAY_WRITE)
3442                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3443                 if (mode & MAY_EXEC)
3444                         args.access |= NFS4_ACCESS_EXECUTE;
3445         }
3446
3447         res.fattr = nfs_alloc_fattr();
3448         if (res.fattr == NULL)
3449                 return -ENOMEM;
3450
3451         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3452         if (!status) {
3453                 nfs_access_set_mask(entry, res.access);
3454                 nfs_refresh_inode(inode, res.fattr);
3455         }
3456         nfs_free_fattr(res.fattr);
3457         return status;
3458 }
3459
3460 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3461 {
3462         struct nfs4_exception exception = { };
3463         int err;
3464         do {
3465                 err = _nfs4_proc_access(inode, entry);
3466                 trace_nfs4_access(inode, err);
3467                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3468                                 &exception);
3469         } while (exception.retry);
3470         return err;
3471 }
3472
3473 /*
3474  * TODO: For the time being, we don't try to get any attributes
3475  * along with any of the zero-copy operations READ, READDIR,
3476  * READLINK, WRITE.
3477  *
3478  * In the case of the first three, we want to put the GETATTR
3479  * after the read-type operation -- this is because it is hard
3480  * to predict the length of a GETATTR response in v4, and thus
3481  * align the READ data correctly.  This means that the GETATTR
3482  * may end up partially falling into the page cache, and we should
3483  * shift it into the 'tail' of the xdr_buf before processing.
3484  * To do this efficiently, we need to know the total length
3485  * of data received, which doesn't seem to be available outside
3486  * of the RPC layer.
3487  *
3488  * In the case of WRITE, we also want to put the GETATTR after
3489  * the operation -- in this case because we want to make sure
3490  * we get the post-operation mtime and size.
3491  *
3492  * Both of these changes to the XDR layer would in fact be quite
3493  * minor, but I decided to leave them for a subsequent patch.
3494  */
3495 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3496                 unsigned int pgbase, unsigned int pglen)
3497 {
3498         struct nfs4_readlink args = {
3499                 .fh       = NFS_FH(inode),
3500                 .pgbase   = pgbase,
3501                 .pglen    = pglen,
3502                 .pages    = &page,
3503         };
3504         struct nfs4_readlink_res res;
3505         struct rpc_message msg = {
3506                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3507                 .rpc_argp = &args,
3508                 .rpc_resp = &res,
3509         };
3510
3511         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3512 }
3513
3514 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3515                 unsigned int pgbase, unsigned int pglen)
3516 {
3517         struct nfs4_exception exception = { };
3518         int err;
3519         do {
3520                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3521                 trace_nfs4_readlink(inode, err);
3522                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3523                                 &exception);
3524         } while (exception.retry);
3525         return err;
3526 }
3527
3528 /*
3529  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3530  */
3531 static int
3532 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3533                  int flags)
3534 {
3535         struct nfs4_label l, *ilabel = NULL;
3536         struct nfs_open_context *ctx;
3537         struct nfs4_state *state;
3538         int opened = 0;
3539         int status = 0;
3540
3541         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3542         if (IS_ERR(ctx))
3543                 return PTR_ERR(ctx);
3544
3545         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3546
3547         sattr->ia_mode &= ~current_umask();
3548         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3549         if (IS_ERR(state)) {
3550                 status = PTR_ERR(state);
3551                 goto out;
3552         }
3553 out:
3554         nfs4_label_release_security(ilabel);
3555         put_nfs_open_context(ctx);
3556         return status;
3557 }
3558
3559 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3560 {
3561         struct nfs_server *server = NFS_SERVER(dir);
3562         struct nfs_removeargs args = {
3563                 .fh = NFS_FH(dir),
3564                 .name = *name,
3565         };
3566         struct nfs_removeres res = {
3567                 .server = server,
3568         };
3569         struct rpc_message msg = {
3570                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3571                 .rpc_argp = &args,
3572                 .rpc_resp = &res,
3573         };
3574         int status;
3575
3576         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3577         if (status == 0)
3578                 update_changeattr(dir, &res.cinfo);
3579         return status;
3580 }
3581
3582 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3583 {
3584         struct nfs4_exception exception = { };
3585         int err;
3586         do {
3587                 err = _nfs4_proc_remove(dir, name);
3588                 trace_nfs4_remove(dir, name, err);
3589                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3590                                 &exception);
3591         } while (exception.retry);
3592         return err;
3593 }
3594
3595 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3596 {
3597         struct nfs_server *server = NFS_SERVER(dir);
3598         struct nfs_removeargs *args = msg->rpc_argp;
3599         struct nfs_removeres *res = msg->rpc_resp;
3600
3601         res->server = server;
3602         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3603         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3604
3605         nfs_fattr_init(res->dir_attr);
3606 }
3607
3608 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3609 {
3610         nfs4_setup_sequence(NFS_SERVER(data->dir),
3611                         &data->args.seq_args,
3612                         &data->res.seq_res,
3613                         task);
3614 }
3615
3616 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3617 {
3618         struct nfs_unlinkdata *data = task->tk_calldata;
3619         struct nfs_removeres *res = &data->res;
3620
3621         if (!nfs4_sequence_done(task, &res->seq_res))
3622                 return 0;
3623         if (nfs4_async_handle_error(task, res->server, NULL,
3624                                     &data->timeout) == -EAGAIN)
3625                 return 0;
3626         update_changeattr(dir, &res->cinfo);
3627         return 1;
3628 }
3629
3630 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3631 {
3632         struct nfs_server *server = NFS_SERVER(dir);
3633         struct nfs_renameargs *arg = msg->rpc_argp;
3634         struct nfs_renameres *res = msg->rpc_resp;
3635
3636         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3637         res->server = server;
3638         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3639 }
3640
3641 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3642 {
3643         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3644                         &data->args.seq_args,
3645                         &data->res.seq_res,
3646                         task);
3647 }
3648
3649 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3650                                  struct inode *new_dir)
3651 {
3652         struct nfs_renamedata *data = task->tk_calldata;
3653         struct nfs_renameres *res = &data->res;
3654
3655         if (!nfs4_sequence_done(task, &res->seq_res))
3656                 return 0;
3657         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3658                 return 0;
3659
3660         update_changeattr(old_dir, &res->old_cinfo);
3661         update_changeattr(new_dir, &res->new_cinfo);
3662         return 1;
3663 }
3664
3665 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3666 {
3667         struct nfs_server *server = NFS_SERVER(inode);
3668         struct nfs4_link_arg arg = {
3669                 .fh     = NFS_FH(inode),
3670                 .dir_fh = NFS_FH(dir),
3671                 .name   = name,
3672                 .bitmask = server->attr_bitmask,
3673         };
3674         struct nfs4_link_res res = {
3675                 .server = server,
3676                 .label = NULL,
3677         };
3678         struct rpc_message msg = {
3679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3680                 .rpc_argp = &arg,
3681                 .rpc_resp = &res,
3682         };
3683         int status = -ENOMEM;
3684
3685         res.fattr = nfs_alloc_fattr();
3686         if (res.fattr == NULL)
3687                 goto out;
3688
3689         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3690         if (IS_ERR(res.label)) {
3691                 status = PTR_ERR(res.label);
3692                 goto out;
3693         }
3694         arg.bitmask = nfs4_bitmask(server, res.label);
3695
3696         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3697         if (!status) {
3698                 update_changeattr(dir, &res.cinfo);
3699                 status = nfs_post_op_update_inode(inode, res.fattr);
3700                 if (!status)
3701                         nfs_setsecurity(inode, res.fattr, res.label);
3702         }
3703
3704
3705         nfs4_label_free(res.label);
3706
3707 out:
3708         nfs_free_fattr(res.fattr);
3709         return status;
3710 }
3711
3712 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3713 {
3714         struct nfs4_exception exception = { };
3715         int err;
3716         do {
3717                 err = nfs4_handle_exception(NFS_SERVER(inode),
3718                                 _nfs4_proc_link(inode, dir, name),
3719                                 &exception);
3720         } while (exception.retry);
3721         return err;
3722 }
3723
3724 struct nfs4_createdata {
3725         struct rpc_message msg;
3726         struct nfs4_create_arg arg;
3727         struct nfs4_create_res res;
3728         struct nfs_fh fh;
3729         struct nfs_fattr fattr;
3730         struct nfs4_label *label;
3731 };
3732
3733 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3734                 struct qstr *name, struct iattr *sattr, u32 ftype)
3735 {
3736         struct nfs4_createdata *data;
3737
3738         data = kzalloc(sizeof(*data), GFP_KERNEL);
3739         if (data != NULL) {
3740                 struct nfs_server *server = NFS_SERVER(dir);
3741
3742                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3743                 if (IS_ERR(data->label))
3744                         goto out_free;
3745
3746                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3747                 data->msg.rpc_argp = &data->arg;
3748                 data->msg.rpc_resp = &data->res;
3749                 data->arg.dir_fh = NFS_FH(dir);
3750                 data->arg.server = server;
3751                 data->arg.name = name;
3752                 data->arg.attrs = sattr;
3753                 data->arg.ftype = ftype;
3754                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3755                 data->res.server = server;
3756                 data->res.fh = &data->fh;
3757                 data->res.fattr = &data->fattr;
3758                 data->res.label = data->label;
3759                 nfs_fattr_init(data->res.fattr);
3760         }
3761         return data;
3762 out_free:
3763         kfree(data);
3764         return NULL;
3765 }
3766
3767 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3768 {
3769         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3770                                     &data->arg.seq_args, &data->res.seq_res, 1);
3771         if (status == 0) {
3772                 update_changeattr(dir, &data->res.dir_cinfo);
3773                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3774         }
3775         return status;
3776 }
3777
3778 static void nfs4_free_createdata(struct nfs4_createdata *data)
3779 {
3780         nfs4_label_free(data->label);
3781         kfree(data);
3782 }
3783
3784 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3785                 struct page *page, unsigned int len, struct iattr *sattr,
3786                 struct nfs4_label *label)
3787 {
3788         struct nfs4_createdata *data;
3789         int status = -ENAMETOOLONG;
3790
3791         if (len > NFS4_MAXPATHLEN)
3792                 goto out;
3793
3794         status = -ENOMEM;
3795         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3796         if (data == NULL)
3797                 goto out;
3798
3799         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3800         data->arg.u.symlink.pages = &page;
3801         data->arg.u.symlink.len = len;
3802         data->arg.label = label;
3803
3804         status = nfs4_do_create(dir, dentry, data);
3805
3806         nfs4_free_createdata(data);
3807 out:
3808         return status;
3809 }
3810
3811 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3812                 struct page *page, unsigned int len, struct iattr *sattr)
3813 {
3814         struct nfs4_exception exception = { };
3815         struct nfs4_label l, *label = NULL;
3816         int err;
3817
3818         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3819
3820         do {
3821                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3822                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3823                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3824                                 &exception);
3825         } while (exception.retry);
3826
3827         nfs4_label_release_security(label);
3828         return err;
3829 }
3830
3831 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3832                 struct iattr *sattr, struct nfs4_label *label)
3833 {
3834         struct nfs4_createdata *data;
3835         int status = -ENOMEM;
3836
3837         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3838         if (data == NULL)
3839                 goto out;
3840
3841         data->arg.label = label;
3842         status = nfs4_do_create(dir, dentry, data);
3843
3844         nfs4_free_createdata(data);
3845 out:
3846         return status;
3847 }
3848
3849 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3850                 struct iattr *sattr)
3851 {
3852         struct nfs4_exception exception = { };
3853         struct nfs4_label l, *label = NULL;
3854         int err;
3855
3856         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3857
3858         sattr->ia_mode &= ~current_umask();
3859         do {
3860                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3861                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3862                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3863                                 &exception);
3864         } while (exception.retry);
3865         nfs4_label_release_security(label);
3866
3867         return err;
3868 }
3869
3870 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3871                 u64 cookie, struct page **pages, unsigned int count, int plus)
3872 {
3873         struct inode            *dir = d_inode(dentry);
3874         struct nfs4_readdir_arg args = {
3875                 .fh = NFS_FH(dir),
3876                 .pages = pages,
3877                 .pgbase = 0,
3878                 .count = count,
3879                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
3880                 .plus = plus,
3881         };
3882         struct nfs4_readdir_res res;
3883         struct rpc_message msg = {
3884                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3885                 .rpc_argp = &args,
3886                 .rpc_resp = &res,
3887                 .rpc_cred = cred,
3888         };
3889         int                     status;
3890
3891         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3892                         dentry,
3893                         (unsigned long long)cookie);
3894         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3895         res.pgbase = args.pgbase;
3896         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3897         if (status >= 0) {
3898                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3899                 status += args.pgbase;
3900         }
3901
3902         nfs_invalidate_atime(dir);
3903
3904         dprintk("%s: returns %d\n", __func__, status);
3905         return status;
3906 }
3907
3908 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3909                 u64 cookie, struct page **pages, unsigned int count, int plus)
3910 {
3911         struct nfs4_exception exception = { };
3912         int err;
3913         do {
3914                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3915                                 pages, count, plus);
3916                 trace_nfs4_readdir(d_inode(dentry), err);
3917                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
3918                                 &exception);
3919         } while (exception.retry);
3920         return err;
3921 }
3922
3923 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3924                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3925 {
3926         struct nfs4_createdata *data;
3927         int mode = sattr->ia_mode;
3928         int status = -ENOMEM;
3929
3930         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3931         if (data == NULL)
3932                 goto out;
3933
3934         if (S_ISFIFO(mode))
3935                 data->arg.ftype = NF4FIFO;
3936         else if (S_ISBLK(mode)) {
3937                 data->arg.ftype = NF4BLK;
3938                 data->arg.u.device.specdata1 = MAJOR(rdev);
3939                 data->arg.u.device.specdata2 = MINOR(rdev);
3940         }
3941         else if (S_ISCHR(mode)) {
3942                 data->arg.ftype = NF4CHR;
3943                 data->arg.u.device.specdata1 = MAJOR(rdev);
3944                 data->arg.u.device.specdata2 = MINOR(rdev);
3945         } else if (!S_ISSOCK(mode)) {
3946                 status = -EINVAL;
3947                 goto out_free;
3948         }
3949
3950         data->arg.label = label;
3951         status = nfs4_do_create(dir, dentry, data);
3952 out_free:
3953         nfs4_free_createdata(data);
3954 out:
3955         return status;
3956 }
3957
3958 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3959                 struct iattr *sattr, dev_t rdev)
3960 {
3961         struct nfs4_exception exception = { };
3962         struct nfs4_label l, *label = NULL;
3963         int err;
3964
3965         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3966
3967         sattr->ia_mode &= ~current_umask();
3968         do {
3969                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3970                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3971                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3972                                 &exception);
3973         } while (exception.retry);
3974
3975         nfs4_label_release_security(label);
3976
3977         return err;
3978 }
3979
3980 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3981                  struct nfs_fsstat *fsstat)
3982 {
3983         struct nfs4_statfs_arg args = {
3984                 .fh = fhandle,
3985                 .bitmask = server->attr_bitmask,
3986         };
3987         struct nfs4_statfs_res res = {
3988                 .fsstat = fsstat,
3989         };
3990         struct rpc_message msg = {
3991                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3992                 .rpc_argp = &args,
3993                 .rpc_resp = &res,
3994         };
3995
3996         nfs_fattr_init(fsstat->fattr);
3997         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3998 }
3999
4000 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4001 {
4002         struct nfs4_exception exception = { };
4003         int err;
4004         do {
4005                 err = nfs4_handle_exception(server,
4006                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4007                                 &exception);
4008         } while (exception.retry);
4009         return err;
4010 }
4011
4012 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4013                 struct nfs_fsinfo *fsinfo)
4014 {
4015         struct nfs4_fsinfo_arg args = {
4016                 .fh = fhandle,
4017                 .bitmask = server->attr_bitmask,
4018         };
4019         struct nfs4_fsinfo_res res = {
4020                 .fsinfo = fsinfo,
4021         };
4022         struct rpc_message msg = {
4023                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4024                 .rpc_argp = &args,
4025                 .rpc_resp = &res,
4026         };
4027
4028         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4029 }
4030
4031 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4032 {
4033         struct nfs4_exception exception = { };
4034         unsigned long now = jiffies;
4035         int err;
4036
4037         do {
4038                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4039                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4040                 if (err == 0) {
4041                         struct nfs_client *clp = server->nfs_client;
4042
4043                         spin_lock(&clp->cl_lock);
4044                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4045                         clp->cl_last_renewal = now;
4046                         spin_unlock(&clp->cl_lock);
4047                         break;
4048                 }
4049                 err = nfs4_handle_exception(server, err, &exception);
4050         } while (exception.retry);
4051         return err;
4052 }
4053
4054 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4055 {
4056         int error;
4057
4058         nfs_fattr_init(fsinfo->fattr);
4059         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4060         if (error == 0) {
4061                 /* block layout checks this! */
4062                 server->pnfs_blksize = fsinfo->blksize;
4063                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4064         }
4065
4066         return error;
4067 }
4068
4069 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4070                 struct nfs_pathconf *pathconf)
4071 {
4072         struct nfs4_pathconf_arg args = {
4073                 .fh = fhandle,
4074                 .bitmask = server->attr_bitmask,
4075         };
4076         struct nfs4_pathconf_res res = {
4077                 .pathconf = pathconf,
4078         };
4079         struct rpc_message msg = {
4080                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4081                 .rpc_argp = &args,
4082                 .rpc_resp = &res,
4083         };
4084
4085         /* None of the pathconf attributes are mandatory to implement */
4086         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4087                 memset(pathconf, 0, sizeof(*pathconf));
4088                 return 0;
4089         }
4090
4091         nfs_fattr_init(pathconf->fattr);
4092         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4093 }
4094
4095 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4096                 struct nfs_pathconf *pathconf)
4097 {
4098         struct nfs4_exception exception = { };
4099         int err;
4100
4101         do {
4102                 err = nfs4_handle_exception(server,
4103                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4104                                 &exception);
4105         } while (exception.retry);
4106         return err;
4107 }
4108
4109 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4110                 const struct nfs_open_context *ctx,
4111                 const struct nfs_lock_context *l_ctx,
4112                 fmode_t fmode)
4113 {
4114         const struct nfs_lockowner *lockowner = NULL;
4115
4116         if (l_ctx != NULL)
4117                 lockowner = &l_ctx->lockowner;
4118         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4119 }
4120 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4121
4122 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4123                 const struct nfs_open_context *ctx,
4124                 const struct nfs_lock_context *l_ctx,
4125                 fmode_t fmode)
4126 {
4127         nfs4_stateid current_stateid;
4128
4129         /* If the current stateid represents a lost lock, then exit */
4130         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4131                 return true;
4132         return nfs4_stateid_match(stateid, &current_stateid);
4133 }
4134
4135 static bool nfs4_error_stateid_expired(int err)
4136 {
4137         switch (err) {
4138         case -NFS4ERR_DELEG_REVOKED:
4139         case -NFS4ERR_ADMIN_REVOKED:
4140         case -NFS4ERR_BAD_STATEID:
4141         case -NFS4ERR_STALE_STATEID:
4142         case -NFS4ERR_OLD_STATEID:
4143         case -NFS4ERR_OPENMODE:
4144         case -NFS4ERR_EXPIRED:
4145                 return true;
4146         }
4147         return false;
4148 }
4149
4150 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4151 {
4152         nfs_invalidate_atime(hdr->inode);
4153 }
4154
4155 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4156 {
4157         struct nfs_server *server = NFS_SERVER(hdr->inode);
4158
4159         trace_nfs4_read(hdr, task->tk_status);
4160         if (nfs4_async_handle_error(task, server,
4161                                     hdr->args.context->state,
4162                                     NULL) == -EAGAIN) {
4163                 rpc_restart_call_prepare(task);
4164                 return -EAGAIN;
4165         }
4166
4167         __nfs4_read_done_cb(hdr);
4168         if (task->tk_status > 0)
4169                 renew_lease(server, hdr->timestamp);
4170         return 0;
4171 }
4172
4173 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4174                 struct nfs_pgio_args *args)
4175 {
4176
4177         if (!nfs4_error_stateid_expired(task->tk_status) ||
4178                 nfs4_stateid_is_current(&args->stateid,
4179                                 args->context,
4180                                 args->lock_context,
4181                                 FMODE_READ))
4182                 return false;
4183         rpc_restart_call_prepare(task);
4184         return true;
4185 }
4186
4187 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4188 {
4189
4190         dprintk("--> %s\n", __func__);
4191
4192         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4193                 return -EAGAIN;
4194         if (nfs4_read_stateid_changed(task, &hdr->args))
4195                 return -EAGAIN;
4196         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4197                                     nfs4_read_done_cb(task, hdr);
4198 }
4199
4200 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4201                                  struct rpc_message *msg)
4202 {
4203         hdr->timestamp   = jiffies;
4204         hdr->pgio_done_cb = nfs4_read_done_cb;
4205         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4206         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4207 }
4208
4209 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4210                                       struct nfs_pgio_header *hdr)
4211 {
4212         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4213                         &hdr->args.seq_args,
4214                         &hdr->res.seq_res,
4215                         task))
4216                 return 0;
4217         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4218                                 hdr->args.lock_context,
4219                                 hdr->rw_ops->rw_mode) == -EIO)
4220                 return -EIO;
4221         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4222                 return -EIO;
4223         return 0;
4224 }
4225
4226 static int nfs4_write_done_cb(struct rpc_task *task,
4227                               struct nfs_pgio_header *hdr)
4228 {
4229         struct inode *inode = hdr->inode;
4230
4231         trace_nfs4_write(hdr, task->tk_status);
4232         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4233                                     hdr->args.context->state,
4234                                     NULL) == -EAGAIN) {
4235                 rpc_restart_call_prepare(task);
4236                 return -EAGAIN;
4237         }
4238         if (task->tk_status >= 0) {
4239                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4240                 nfs_writeback_update_inode(hdr);
4241         }
4242         return 0;
4243 }
4244
4245 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4246                 struct nfs_pgio_args *args)
4247 {
4248
4249         if (!nfs4_error_stateid_expired(task->tk_status) ||
4250                 nfs4_stateid_is_current(&args->stateid,
4251                                 args->context,
4252                                 args->lock_context,
4253                                 FMODE_WRITE))
4254                 return false;
4255         rpc_restart_call_prepare(task);
4256         return true;
4257 }
4258
4259 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4260 {
4261         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4262                 return -EAGAIN;
4263         if (nfs4_write_stateid_changed(task, &hdr->args))
4264                 return -EAGAIN;
4265         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4266                 nfs4_write_done_cb(task, hdr);
4267 }
4268
4269 static
4270 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4271 {
4272         /* Don't request attributes for pNFS or O_DIRECT writes */
4273         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4274                 return false;
4275         /* Otherwise, request attributes if and only if we don't hold
4276          * a delegation
4277          */
4278         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4279 }
4280
4281 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4282                                   struct rpc_message *msg)
4283 {
4284         struct nfs_server *server = NFS_SERVER(hdr->inode);
4285
4286         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4287                 hdr->args.bitmask = NULL;
4288                 hdr->res.fattr = NULL;
4289         } else
4290                 hdr->args.bitmask = server->cache_consistency_bitmask;
4291
4292         if (!hdr->pgio_done_cb)
4293                 hdr->pgio_done_cb = nfs4_write_done_cb;
4294         hdr->res.server = server;
4295         hdr->timestamp   = jiffies;
4296
4297         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4298         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4299 }
4300
4301 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4302 {
4303         nfs4_setup_sequence(NFS_SERVER(data->inode),
4304                         &data->args.seq_args,
4305                         &data->res.seq_res,
4306                         task);
4307 }
4308
4309 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4310 {
4311         struct inode *inode = data->inode;
4312
4313         trace_nfs4_commit(data, task->tk_status);
4314         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4315                                     NULL, NULL) == -EAGAIN) {
4316                 rpc_restart_call_prepare(task);
4317                 return -EAGAIN;
4318         }
4319         return 0;
4320 }
4321
4322 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4323 {
4324         if (!nfs4_sequence_done(task, &data->res.seq_res))
4325                 return -EAGAIN;
4326         return data->commit_done_cb(task, data);
4327 }
4328
4329 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4330 {
4331         struct nfs_server *server = NFS_SERVER(data->inode);
4332
4333         if (data->commit_done_cb == NULL)
4334                 data->commit_done_cb = nfs4_commit_done_cb;
4335         data->res.server = server;
4336         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4337         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4338 }
4339
4340 struct nfs4_renewdata {
4341         struct nfs_client       *client;
4342         unsigned long           timestamp;
4343 };
4344
4345 /*
4346  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4347  * standalone procedure for queueing an asynchronous RENEW.
4348  */
4349 static void nfs4_renew_release(void *calldata)
4350 {
4351         struct nfs4_renewdata *data = calldata;
4352         struct nfs_client *clp = data->client;
4353
4354         if (atomic_read(&clp->cl_count) > 1)
4355                 nfs4_schedule_state_renewal(clp);
4356         nfs_put_client(clp);
4357         kfree(data);
4358 }
4359
4360 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4361 {
4362         struct nfs4_renewdata *data = calldata;
4363         struct nfs_client *clp = data->client;
4364         unsigned long timestamp = data->timestamp;
4365
4366         trace_nfs4_renew_async(clp, task->tk_status);
4367         switch (task->tk_status) {
4368         case 0:
4369                 break;
4370         case -NFS4ERR_LEASE_MOVED:
4371                 nfs4_schedule_lease_moved_recovery(clp);
4372                 break;
4373         default:
4374                 /* Unless we're shutting down, schedule state recovery! */
4375                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4376                         return;
4377                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4378                         nfs4_schedule_lease_recovery(clp);
4379                         return;
4380                 }
4381                 nfs4_schedule_path_down_recovery(clp);
4382         }
4383         do_renew_lease(clp, timestamp);
4384 }
4385
4386 static const struct rpc_call_ops nfs4_renew_ops = {
4387         .rpc_call_done = nfs4_renew_done,
4388         .rpc_release = nfs4_renew_release,
4389 };
4390
4391 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4392 {
4393         struct rpc_message msg = {
4394                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4395                 .rpc_argp       = clp,
4396                 .rpc_cred       = cred,
4397         };
4398         struct nfs4_renewdata *data;
4399
4400         if (renew_flags == 0)
4401                 return 0;
4402         if (!atomic_inc_not_zero(&clp->cl_count))
4403                 return -EIO;
4404         data = kmalloc(sizeof(*data), GFP_NOFS);
4405         if (data == NULL)
4406                 return -ENOMEM;
4407         data->client = clp;
4408         data->timestamp = jiffies;
4409         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4410                         &nfs4_renew_ops, data);
4411 }
4412
4413 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4414 {
4415         struct rpc_message msg = {
4416                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4417                 .rpc_argp       = clp,
4418                 .rpc_cred       = cred,
4419         };
4420         unsigned long now = jiffies;
4421         int status;
4422
4423         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4424         if (status < 0)
4425                 return status;
4426         do_renew_lease(clp, now);
4427         return 0;
4428 }
4429
4430 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4431 {
4432         return server->caps & NFS_CAP_ACLS;
4433 }
4434
4435 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4436  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4437  * the stack.
4438  */
4439 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4440
4441 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4442                 struct page **pages, unsigned int *pgbase)
4443 {
4444         struct page *newpage, **spages;
4445         int rc = 0;
4446         size_t len;
4447         spages = pages;
4448
4449         do {
4450                 len = min_t(size_t, PAGE_SIZE, buflen);
4451                 newpage = alloc_page(GFP_KERNEL);
4452
4453                 if (newpage == NULL)
4454                         goto unwind;
4455                 memcpy(page_address(newpage), buf, len);
4456                 buf += len;
4457                 buflen -= len;
4458                 *pages++ = newpage;
4459                 rc++;
4460         } while (buflen != 0);
4461
4462         return rc;
4463
4464 unwind:
4465         for(; rc > 0; rc--)
4466                 __free_page(spages[rc-1]);
4467         return -ENOMEM;
4468 }
4469
4470 struct nfs4_cached_acl {
4471         int cached;
4472         size_t len;
4473         char data[0];
4474 };
4475
4476 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4477 {
4478         struct nfs_inode *nfsi = NFS_I(inode);
4479
4480         spin_lock(&inode->i_lock);
4481         kfree(nfsi->nfs4_acl);
4482         nfsi->nfs4_acl = acl;
4483         spin_unlock(&inode->i_lock);
4484 }
4485
4486 static void nfs4_zap_acl_attr(struct inode *inode)
4487 {
4488         nfs4_set_cached_acl(inode, NULL);
4489 }
4490
4491 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4492 {
4493         struct nfs_inode *nfsi = NFS_I(inode);
4494         struct nfs4_cached_acl *acl;
4495         int ret = -ENOENT;
4496
4497         spin_lock(&inode->i_lock);
4498         acl = nfsi->nfs4_acl;
4499         if (acl == NULL)
4500                 goto out;
4501         if (buf == NULL) /* user is just asking for length */
4502                 goto out_len;
4503         if (acl->cached == 0)
4504                 goto out;
4505         ret = -ERANGE; /* see getxattr(2) man page */
4506         if (acl->len > buflen)
4507                 goto out;
4508         memcpy(buf, acl->data, acl->len);
4509 out_len:
4510         ret = acl->len;
4511 out:
4512         spin_unlock(&inode->i_lock);
4513         return ret;
4514 }
4515
4516 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4517 {
4518         struct nfs4_cached_acl *acl;
4519         size_t buflen = sizeof(*acl) + acl_len;
4520
4521         if (buflen <= PAGE_SIZE) {
4522                 acl = kmalloc(buflen, GFP_KERNEL);
4523                 if (acl == NULL)
4524                         goto out;
4525                 acl->cached = 1;
4526                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4527         } else {
4528                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4529                 if (acl == NULL)
4530                         goto out;
4531                 acl->cached = 0;
4532         }
4533         acl->len = acl_len;
4534 out:
4535         nfs4_set_cached_acl(inode, acl);
4536 }
4537
4538 /*
4539  * The getxattr API returns the required buffer length when called with a
4540  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4541  * the required buf.  On a NULL buf, we send a page of data to the server
4542  * guessing that the ACL request can be serviced by a page. If so, we cache
4543  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4544  * the cache. If not so, we throw away the page, and cache the required
4545  * length. The next getxattr call will then produce another round trip to
4546  * the server, this time with the input buf of the required size.
4547  */
4548 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4549 {
4550         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4551         struct nfs_getaclargs args = {
4552                 .fh = NFS_FH(inode),
4553                 .acl_pages = pages,
4554                 .acl_len = buflen,
4555         };
4556         struct nfs_getaclres res = {
4557                 .acl_len = buflen,
4558         };
4559         struct rpc_message msg = {
4560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4561                 .rpc_argp = &args,
4562                 .rpc_resp = &res,
4563         };
4564         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4565         int ret = -ENOMEM, i;
4566
4567         /* As long as we're doing a round trip to the server anyway,
4568          * let's be prepared for a page of acl data. */
4569         if (npages == 0)
4570                 npages = 1;
4571         if (npages > ARRAY_SIZE(pages))
4572                 return -ERANGE;
4573
4574         for (i = 0; i < npages; i++) {
4575                 pages[i] = alloc_page(GFP_KERNEL);
4576                 if (!pages[i])
4577                         goto out_free;
4578         }
4579
4580         /* for decoding across pages */
4581         res.acl_scratch = alloc_page(GFP_KERNEL);
4582         if (!res.acl_scratch)
4583                 goto out_free;
4584
4585         args.acl_len = npages * PAGE_SIZE;
4586         args.acl_pgbase = 0;
4587
4588         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4589                 __func__, buf, buflen, npages, args.acl_len);
4590         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4591                              &msg, &args.seq_args, &res.seq_res, 0);
4592         if (ret)
4593                 goto out_free;
4594
4595         /* Handle the case where the passed-in buffer is too short */
4596         if (res.acl_flags & NFS4_ACL_TRUNC) {
4597                 /* Did the user only issue a request for the acl length? */
4598                 if (buf == NULL)
4599                         goto out_ok;
4600                 ret = -ERANGE;
4601                 goto out_free;
4602         }
4603         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4604         if (buf) {
4605                 if (res.acl_len > buflen) {
4606                         ret = -ERANGE;
4607                         goto out_free;
4608                 }
4609                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4610         }
4611 out_ok:
4612         ret = res.acl_len;
4613 out_free:
4614         for (i = 0; i < npages; i++)
4615                 if (pages[i])
4616                         __free_page(pages[i]);
4617         if (res.acl_scratch)
4618                 __free_page(res.acl_scratch);
4619         return ret;
4620 }
4621
4622 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4623 {
4624         struct nfs4_exception exception = { };
4625         ssize_t ret;
4626         do {
4627                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4628                 trace_nfs4_get_acl(inode, ret);
4629                 if (ret >= 0)
4630                         break;
4631                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4632         } while (exception.retry);
4633         return ret;
4634 }
4635
4636 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4637 {
4638         struct nfs_server *server = NFS_SERVER(inode);
4639         int ret;
4640
4641         if (!nfs4_server_supports_acls(server))
4642                 return -EOPNOTSUPP;
4643         ret = nfs_revalidate_inode(server, inode);
4644         if (ret < 0)
4645                 return ret;
4646         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4647                 nfs_zap_acl_cache(inode);
4648         ret = nfs4_read_cached_acl(inode, buf, buflen);
4649         if (ret != -ENOENT)
4650                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4651                  * but no cached acl data, just the acl length */
4652                 return ret;
4653         return nfs4_get_acl_uncached(inode, buf, buflen);
4654 }
4655
4656 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4657 {
4658         struct nfs_server *server = NFS_SERVER(inode);
4659         struct page *pages[NFS4ACL_MAXPAGES];
4660         struct nfs_setaclargs arg = {
4661                 .fh             = NFS_FH(inode),
4662                 .acl_pages      = pages,
4663                 .acl_len        = buflen,
4664         };
4665         struct nfs_setaclres res;
4666         struct rpc_message msg = {
4667                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4668                 .rpc_argp       = &arg,
4669                 .rpc_resp       = &res,
4670         };
4671         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4672         int ret, i;
4673
4674         if (!nfs4_server_supports_acls(server))
4675                 return -EOPNOTSUPP;
4676         if (npages > ARRAY_SIZE(pages))
4677                 return -ERANGE;
4678         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4679         if (i < 0)
4680                 return i;
4681         nfs4_inode_return_delegation(inode);
4682         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4683
4684         /*
4685          * Free each page after tx, so the only ref left is
4686          * held by the network stack
4687          */
4688         for (; i > 0; i--)
4689                 put_page(pages[i-1]);
4690
4691         /*
4692          * Acl update can result in inode attribute update.
4693          * so mark the attribute cache invalid.
4694          */
4695         spin_lock(&inode->i_lock);
4696         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4697         spin_unlock(&inode->i_lock);
4698         nfs_access_zap_cache(inode);
4699         nfs_zap_acl_cache(inode);
4700         return ret;
4701 }
4702
4703 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4704 {
4705         struct nfs4_exception exception = { };
4706         int err;
4707         do {
4708                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4709                 trace_nfs4_set_acl(inode, err);
4710                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4711                                 &exception);
4712         } while (exception.retry);
4713         return err;
4714 }
4715
4716 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4717 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4718                                         size_t buflen)
4719 {
4720         struct nfs_server *server = NFS_SERVER(inode);
4721         struct nfs_fattr fattr;
4722         struct nfs4_label label = {0, 0, buflen, buf};
4723
4724         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4725         struct nfs4_getattr_arg arg = {
4726                 .fh             = NFS_FH(inode),
4727                 .bitmask        = bitmask,
4728         };
4729         struct nfs4_getattr_res res = {
4730                 .fattr          = &fattr,
4731                 .label          = &label,
4732                 .server         = server,
4733         };
4734         struct rpc_message msg = {
4735                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4736                 .rpc_argp       = &arg,
4737                 .rpc_resp       = &res,
4738         };
4739         int ret;
4740
4741         nfs_fattr_init(&fattr);
4742
4743         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4744         if (ret)
4745                 return ret;
4746         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4747                 return -ENOENT;
4748         if (buflen < label.len)
4749                 return -ERANGE;
4750         return 0;
4751 }
4752
4753 static int nfs4_get_security_label(struct inode *inode, void *buf,
4754                                         size_t buflen)
4755 {
4756         struct nfs4_exception exception = { };
4757         int err;
4758
4759         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4760                 return -EOPNOTSUPP;
4761
4762         do {
4763                 err = _nfs4_get_security_label(inode, buf, buflen);
4764                 trace_nfs4_get_security_label(inode, err);
4765                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4766                                 &exception);
4767         } while (exception.retry);
4768         return err;
4769 }
4770
4771 static int _nfs4_do_set_security_label(struct inode *inode,
4772                 struct nfs4_label *ilabel,
4773                 struct nfs_fattr *fattr,
4774                 struct nfs4_label *olabel)
4775 {
4776
4777         struct iattr sattr = {0};
4778         struct nfs_server *server = NFS_SERVER(inode);
4779         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4780         struct nfs_setattrargs arg = {
4781                 .fh             = NFS_FH(inode),
4782                 .iap            = &sattr,
4783                 .server         = server,
4784                 .bitmask        = bitmask,
4785                 .label          = ilabel,
4786         };
4787         struct nfs_setattrres res = {
4788                 .fattr          = fattr,
4789                 .label          = olabel,
4790                 .server         = server,
4791         };
4792         struct rpc_message msg = {
4793                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4794                 .rpc_argp       = &arg,
4795                 .rpc_resp       = &res,
4796         };
4797         int status;
4798
4799         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4800
4801         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4802         if (status)
4803                 dprintk("%s failed: %d\n", __func__, status);
4804
4805         return status;
4806 }
4807
4808 static int nfs4_do_set_security_label(struct inode *inode,
4809                 struct nfs4_label *ilabel,
4810                 struct nfs_fattr *fattr,
4811                 struct nfs4_label *olabel)
4812 {
4813         struct nfs4_exception exception = { };
4814         int err;
4815
4816         do {
4817                 err = _nfs4_do_set_security_label(inode, ilabel,
4818                                 fattr, olabel);
4819                 trace_nfs4_set_security_label(inode, err);
4820                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4821                                 &exception);
4822         } while (exception.retry);
4823         return err;
4824 }
4825
4826 static int
4827 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4828 {
4829         struct nfs4_label ilabel, *olabel = NULL;
4830         struct nfs_fattr fattr;
4831         struct rpc_cred *cred;
4832         struct inode *inode = d_inode(dentry);
4833         int status;
4834
4835         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4836                 return -EOPNOTSUPP;
4837
4838         nfs_fattr_init(&fattr);
4839
4840         ilabel.pi = 0;
4841         ilabel.lfs = 0;
4842         ilabel.label = (char *)buf;
4843         ilabel.len = buflen;
4844
4845         cred = rpc_lookup_cred();
4846         if (IS_ERR(cred))
4847                 return PTR_ERR(cred);
4848
4849         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4850         if (IS_ERR(olabel)) {
4851                 status = -PTR_ERR(olabel);
4852                 goto out;
4853         }
4854
4855         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4856         if (status == 0)
4857                 nfs_setsecurity(inode, &fattr, olabel);
4858
4859         nfs4_label_free(olabel);
4860 out:
4861         put_rpccred(cred);
4862         return status;
4863 }
4864 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4865
4866
4867 static int
4868 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4869                         struct nfs4_state *state, long *timeout)
4870 {
4871         struct nfs_client *clp = server->nfs_client;
4872
4873         if (task->tk_status >= 0)
4874                 return 0;
4875         switch(task->tk_status) {
4876                 case -NFS4ERR_DELEG_REVOKED:
4877                 case -NFS4ERR_ADMIN_REVOKED:
4878                 case -NFS4ERR_BAD_STATEID:
4879                 case -NFS4ERR_OPENMODE:
4880                         if (state == NULL)
4881                                 break;
4882                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4883                                 goto recovery_failed;
4884                         goto wait_on_recovery;
4885                 case -NFS4ERR_EXPIRED:
4886                         if (state != NULL) {
4887                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4888                                         goto recovery_failed;
4889                         }
4890                 case -NFS4ERR_STALE_STATEID:
4891                 case -NFS4ERR_STALE_CLIENTID:
4892                         nfs4_schedule_lease_recovery(clp);
4893                         goto wait_on_recovery;
4894                 case -NFS4ERR_MOVED:
4895                         if (nfs4_schedule_migration_recovery(server) < 0)
4896                                 goto recovery_failed;
4897                         goto wait_on_recovery;
4898                 case -NFS4ERR_LEASE_MOVED:
4899                         nfs4_schedule_lease_moved_recovery(clp);
4900                         goto wait_on_recovery;
4901 #if defined(CONFIG_NFS_V4_1)
4902                 case -NFS4ERR_BADSESSION:
4903                 case -NFS4ERR_BADSLOT:
4904                 case -NFS4ERR_BAD_HIGH_SLOT:
4905                 case -NFS4ERR_DEADSESSION:
4906                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4907                 case -NFS4ERR_SEQ_FALSE_RETRY:
4908                 case -NFS4ERR_SEQ_MISORDERED:
4909                         dprintk("%s ERROR %d, Reset session\n", __func__,
4910                                 task->tk_status);
4911                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4912                         goto wait_on_recovery;
4913 #endif /* CONFIG_NFS_V4_1 */
4914                 case -NFS4ERR_DELAY:
4915                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4916                         rpc_delay(task, nfs4_update_delay(timeout));
4917                         goto restart_call;
4918                 case -NFS4ERR_GRACE:
4919                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4920                 case -NFS4ERR_RETRY_UNCACHED_REP:
4921                 case -NFS4ERR_OLD_STATEID:
4922                         goto restart_call;
4923         }
4924         task->tk_status = nfs4_map_errors(task->tk_status);
4925         return 0;
4926 recovery_failed:
4927         task->tk_status = -EIO;
4928         return 0;
4929 wait_on_recovery:
4930         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4931         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4932                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4933         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4934                 goto recovery_failed;
4935 restart_call:
4936         task->tk_status = 0;
4937         return -EAGAIN;
4938 }
4939
4940 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4941                                     nfs4_verifier *bootverf)
4942 {
4943         __be32 verf[2];
4944
4945         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4946                 /* An impossible timestamp guarantees this value
4947                  * will never match a generated boot time. */
4948                 verf[0] = 0;
4949                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4950         } else {
4951                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4952                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4953                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4954         }
4955         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4956 }
4957
4958 static unsigned int
4959 nfs4_init_nonuniform_client_string(struct nfs_client *clp,
4960                                    char *buf, size_t len)
4961 {
4962         unsigned int result;
4963
4964         if (clp->cl_owner_id != NULL)
4965                 return strlcpy(buf, clp->cl_owner_id, len);
4966
4967         rcu_read_lock();
4968         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4969                                 clp->cl_ipaddr,
4970                                 rpc_peeraddr2str(clp->cl_rpcclient,
4971                                                         RPC_DISPLAY_ADDR),
4972                                 rpc_peeraddr2str(clp->cl_rpcclient,
4973                                                         RPC_DISPLAY_PROTO));
4974         rcu_read_unlock();
4975         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4976         return result;
4977 }
4978
4979 static unsigned int
4980 nfs4_init_uniform_client_string(struct nfs_client *clp,
4981                                 char *buf, size_t len)
4982 {
4983         const char *nodename = clp->cl_rpcclient->cl_nodename;
4984         unsigned int result;
4985
4986         if (clp->cl_owner_id != NULL)
4987                 return strlcpy(buf, clp->cl_owner_id, len);
4988
4989         if (nfs4_client_id_uniquifier[0] != '\0')
4990                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4991                                 clp->rpc_ops->version,
4992                                 clp->cl_minorversion,
4993                                 nfs4_client_id_uniquifier,
4994                                 nodename);
4995         else
4996                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s",
4997                                 clp->rpc_ops->version, clp->cl_minorversion,
4998                                 nodename);
4999         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
5000         return result;
5001 }
5002
5003 /*
5004  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5005  * services.  Advertise one based on the address family of the
5006  * clientaddr.
5007  */
5008 static unsigned int
5009 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5010 {
5011         if (strchr(clp->cl_ipaddr, ':') != NULL)
5012                 return scnprintf(buf, len, "tcp6");
5013         else
5014                 return scnprintf(buf, len, "tcp");
5015 }
5016
5017 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5018 {
5019         struct nfs4_setclientid *sc = calldata;
5020
5021         if (task->tk_status == 0)
5022                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5023 }
5024
5025 static const struct rpc_call_ops nfs4_setclientid_ops = {
5026         .rpc_call_done = nfs4_setclientid_done,
5027 };
5028
5029 /**
5030  * nfs4_proc_setclientid - Negotiate client ID
5031  * @clp: state data structure
5032  * @program: RPC program for NFSv4 callback service
5033  * @port: IP port number for NFS4 callback service
5034  * @cred: RPC credential to use for this call
5035  * @res: where to place the result
5036  *
5037  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5038  */
5039 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5040                 unsigned short port, struct rpc_cred *cred,
5041                 struct nfs4_setclientid_res *res)
5042 {
5043         nfs4_verifier sc_verifier;
5044         struct nfs4_setclientid setclientid = {
5045                 .sc_verifier = &sc_verifier,
5046                 .sc_prog = program,
5047                 .sc_cb_ident = clp->cl_cb_ident,
5048         };
5049         struct rpc_message msg = {
5050                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5051                 .rpc_argp = &setclientid,
5052                 .rpc_resp = res,
5053                 .rpc_cred = cred,
5054         };
5055         struct rpc_task *task;
5056         struct rpc_task_setup task_setup_data = {
5057                 .rpc_client = clp->cl_rpcclient,
5058                 .rpc_message = &msg,
5059                 .callback_ops = &nfs4_setclientid_ops,
5060                 .callback_data = &setclientid,
5061                 .flags = RPC_TASK_TIMEOUT,
5062         };
5063         int status;
5064
5065         /* nfs_client_id4 */
5066         nfs4_init_boot_verifier(clp, &sc_verifier);
5067         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5068                 setclientid.sc_name_len =
5069                                 nfs4_init_uniform_client_string(clp,
5070                                                 setclientid.sc_name,
5071                                                 sizeof(setclientid.sc_name));
5072         else
5073                 setclientid.sc_name_len =
5074                                 nfs4_init_nonuniform_client_string(clp,
5075                                                 setclientid.sc_name,
5076                                                 sizeof(setclientid.sc_name));
5077         /* cb_client4 */
5078         setclientid.sc_netid_len =
5079                                 nfs4_init_callback_netid(clp,
5080                                                 setclientid.sc_netid,
5081                                                 sizeof(setclientid.sc_netid));
5082         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5083                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5084                                 clp->cl_ipaddr, port >> 8, port & 255);
5085
5086         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5087                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5088                 setclientid.sc_name_len, setclientid.sc_name);
5089         task = rpc_run_task(&task_setup_data);
5090         if (IS_ERR(task)) {
5091                 status = PTR_ERR(task);
5092                 goto out;
5093         }
5094         status = task->tk_status;
5095         if (setclientid.sc_cred) {
5096                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5097                 put_rpccred(setclientid.sc_cred);
5098         }
5099         rpc_put_task(task);
5100 out:
5101         trace_nfs4_setclientid(clp, status);
5102         dprintk("NFS reply setclientid: %d\n", status);
5103         return status;
5104 }
5105
5106 /**
5107  * nfs4_proc_setclientid_confirm - Confirm client ID
5108  * @clp: state data structure
5109  * @res: result of a previous SETCLIENTID
5110  * @cred: RPC credential to use for this call
5111  *
5112  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5113  */
5114 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5115                 struct nfs4_setclientid_res *arg,
5116                 struct rpc_cred *cred)
5117 {
5118         struct rpc_message msg = {
5119                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5120                 .rpc_argp = arg,
5121                 .rpc_cred = cred,
5122         };
5123         int status;
5124
5125         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5126                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5127                 clp->cl_clientid);
5128         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5129         trace_nfs4_setclientid_confirm(clp, status);
5130         dprintk("NFS reply setclientid_confirm: %d\n", status);
5131         return status;
5132 }
5133
5134 struct nfs4_delegreturndata {
5135         struct nfs4_delegreturnargs args;
5136         struct nfs4_delegreturnres res;
5137         struct nfs_fh fh;
5138         nfs4_stateid stateid;
5139         unsigned long timestamp;
5140         struct nfs_fattr fattr;
5141         int rpc_status;
5142         struct inode *inode;
5143         bool roc;
5144         u32 roc_barrier;
5145 };
5146
5147 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5148 {
5149         struct nfs4_delegreturndata *data = calldata;
5150
5151         if (!nfs4_sequence_done(task, &data->res.seq_res))
5152                 return;
5153
5154         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5155         switch (task->tk_status) {
5156         case 0:
5157                 renew_lease(data->res.server, data->timestamp);
5158         case -NFS4ERR_ADMIN_REVOKED:
5159         case -NFS4ERR_DELEG_REVOKED:
5160         case -NFS4ERR_BAD_STATEID:
5161         case -NFS4ERR_OLD_STATEID:
5162         case -NFS4ERR_STALE_STATEID:
5163         case -NFS4ERR_EXPIRED:
5164                 task->tk_status = 0;
5165                 if (data->roc)
5166                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5167                 break;
5168         default:
5169                 if (nfs4_async_handle_error(task, data->res.server,
5170                                             NULL, NULL) == -EAGAIN) {
5171                         rpc_restart_call_prepare(task);
5172                         return;
5173                 }
5174         }
5175         data->rpc_status = task->tk_status;
5176 }
5177
5178 static void nfs4_delegreturn_release(void *calldata)
5179 {
5180         struct nfs4_delegreturndata *data = calldata;
5181         struct inode *inode = data->inode;
5182
5183         if (inode) {
5184                 if (data->roc)
5185                         pnfs_roc_release(inode);
5186                 nfs_iput_and_deactive(inode);
5187         }
5188         kfree(calldata);
5189 }
5190
5191 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5192 {
5193         struct nfs4_delegreturndata *d_data;
5194
5195         d_data = (struct nfs4_delegreturndata *)data;
5196
5197         if (d_data->roc &&
5198             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5199                 return;
5200
5201         nfs4_setup_sequence(d_data->res.server,
5202                         &d_data->args.seq_args,
5203                         &d_data->res.seq_res,
5204                         task);
5205 }
5206
5207 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5208         .rpc_call_prepare = nfs4_delegreturn_prepare,
5209         .rpc_call_done = nfs4_delegreturn_done,
5210         .rpc_release = nfs4_delegreturn_release,
5211 };
5212
5213 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5214 {
5215         struct nfs4_delegreturndata *data;
5216         struct nfs_server *server = NFS_SERVER(inode);
5217         struct rpc_task *task;
5218         struct rpc_message msg = {
5219                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5220                 .rpc_cred = cred,
5221         };
5222         struct rpc_task_setup task_setup_data = {
5223                 .rpc_client = server->client,
5224                 .rpc_message = &msg,
5225                 .callback_ops = &nfs4_delegreturn_ops,
5226                 .flags = RPC_TASK_ASYNC,
5227         };
5228         int status = 0;
5229
5230         data = kzalloc(sizeof(*data), GFP_NOFS);
5231         if (data == NULL)
5232                 return -ENOMEM;
5233         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5234         data->args.fhandle = &data->fh;
5235         data->args.stateid = &data->stateid;
5236         data->args.bitmask = server->cache_consistency_bitmask;
5237         nfs_copy_fh(&data->fh, NFS_FH(inode));
5238         nfs4_stateid_copy(&data->stateid, stateid);
5239         data->res.fattr = &data->fattr;
5240         data->res.server = server;
5241         nfs_fattr_init(data->res.fattr);
5242         data->timestamp = jiffies;
5243         data->rpc_status = 0;
5244         data->inode = nfs_igrab_and_active(inode);
5245         if (data->inode)
5246                 data->roc = nfs4_roc(inode);
5247
5248         task_setup_data.callback_data = data;
5249         msg.rpc_argp = &data->args;
5250         msg.rpc_resp = &data->res;
5251         task = rpc_run_task(&task_setup_data);
5252         if (IS_ERR(task))
5253                 return PTR_ERR(task);
5254         if (!issync)
5255                 goto out;
5256         status = nfs4_wait_for_completion_rpc_task(task);
5257         if (status != 0)
5258                 goto out;
5259         status = data->rpc_status;
5260         if (status == 0)
5261                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5262         else
5263                 nfs_refresh_inode(inode, &data->fattr);
5264 out:
5265         rpc_put_task(task);
5266         return status;
5267 }
5268
5269 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5270 {
5271         struct nfs_server *server = NFS_SERVER(inode);
5272         struct nfs4_exception exception = { };
5273         int err;
5274         do {
5275                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5276                 trace_nfs4_delegreturn(inode, err);
5277                 switch (err) {
5278                         case -NFS4ERR_STALE_STATEID:
5279                         case -NFS4ERR_EXPIRED:
5280                         case 0:
5281                                 return 0;
5282                 }
5283                 err = nfs4_handle_exception(server, err, &exception);
5284         } while (exception.retry);
5285         return err;
5286 }
5287
5288 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5289 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5290
5291 /*
5292  * sleep, with exponential backoff, and retry the LOCK operation.
5293  */
5294 static unsigned long
5295 nfs4_set_lock_task_retry(unsigned long timeout)
5296 {
5297         freezable_schedule_timeout_killable_unsafe(timeout);
5298         timeout <<= 1;
5299         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5300                 return NFS4_LOCK_MAXTIMEOUT;
5301         return timeout;
5302 }
5303
5304 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5305 {
5306         struct inode *inode = state->inode;
5307         struct nfs_server *server = NFS_SERVER(inode);
5308         struct nfs_client *clp = server->nfs_client;
5309         struct nfs_lockt_args arg = {
5310                 .fh = NFS_FH(inode),
5311                 .fl = request,
5312         };
5313         struct nfs_lockt_res res = {
5314                 .denied = request,
5315         };
5316         struct rpc_message msg = {
5317                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5318                 .rpc_argp       = &arg,
5319                 .rpc_resp       = &res,
5320                 .rpc_cred       = state->owner->so_cred,
5321         };
5322         struct nfs4_lock_state *lsp;
5323         int status;
5324
5325         arg.lock_owner.clientid = clp->cl_clientid;
5326         status = nfs4_set_lock_state(state, request);
5327         if (status != 0)
5328                 goto out;
5329         lsp = request->fl_u.nfs4_fl.owner;
5330         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5331         arg.lock_owner.s_dev = server->s_dev;
5332         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5333         switch (status) {
5334                 case 0:
5335                         request->fl_type = F_UNLCK;
5336                         break;
5337                 case -NFS4ERR_DENIED:
5338                         status = 0;
5339         }
5340         request->fl_ops->fl_release_private(request);
5341         request->fl_ops = NULL;
5342 out:
5343         return status;
5344 }
5345
5346 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5347 {
5348         struct nfs4_exception exception = { };
5349         int err;
5350
5351         do {
5352                 err = _nfs4_proc_getlk(state, cmd, request);
5353                 trace_nfs4_get_lock(request, state, cmd, err);
5354                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5355                                 &exception);
5356         } while (exception.retry);
5357         return err;
5358 }
5359
5360 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5361 {
5362         int res = 0;
5363         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5364                 case FL_POSIX:
5365                         res = posix_lock_file_wait(file, fl);
5366                         break;
5367                 case FL_FLOCK:
5368                         res = flock_lock_file_wait(file, fl);
5369                         break;
5370                 default:
5371                         BUG();
5372         }
5373         return res;
5374 }
5375
5376 struct nfs4_unlockdata {
5377         struct nfs_locku_args arg;
5378         struct nfs_locku_res res;
5379         struct nfs4_lock_state *lsp;
5380         struct nfs_open_context *ctx;
5381         struct file_lock fl;
5382         const struct nfs_server *server;
5383         unsigned long timestamp;
5384 };
5385
5386 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5387                 struct nfs_open_context *ctx,
5388                 struct nfs4_lock_state *lsp,
5389                 struct nfs_seqid *seqid)
5390 {
5391         struct nfs4_unlockdata *p;
5392         struct inode *inode = lsp->ls_state->inode;
5393
5394         p = kzalloc(sizeof(*p), GFP_NOFS);
5395         if (p == NULL)
5396                 return NULL;
5397         p->arg.fh = NFS_FH(inode);
5398         p->arg.fl = &p->fl;
5399         p->arg.seqid = seqid;
5400         p->res.seqid = seqid;
5401         p->lsp = lsp;
5402         atomic_inc(&lsp->ls_count);
5403         /* Ensure we don't close file until we're done freeing locks! */
5404         p->ctx = get_nfs_open_context(ctx);
5405         memcpy(&p->fl, fl, sizeof(p->fl));
5406         p->server = NFS_SERVER(inode);
5407         return p;
5408 }
5409
5410 static void nfs4_locku_release_calldata(void *data)
5411 {
5412         struct nfs4_unlockdata *calldata = data;
5413         nfs_free_seqid(calldata->arg.seqid);
5414         nfs4_put_lock_state(calldata->lsp);
5415         put_nfs_open_context(calldata->ctx);
5416         kfree(calldata);
5417 }
5418
5419 static void nfs4_locku_done(struct rpc_task *task, void *data)
5420 {
5421         struct nfs4_unlockdata *calldata = data;
5422
5423         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5424                 return;
5425         switch (task->tk_status) {
5426                 case 0:
5427                         renew_lease(calldata->server, calldata->timestamp);
5428                         do_vfs_lock(calldata->fl.fl_file, &calldata->fl);
5429                         if (nfs4_update_lock_stateid(calldata->lsp,
5430                                         &calldata->res.stateid))
5431                                 break;
5432                 case -NFS4ERR_BAD_STATEID:
5433                 case -NFS4ERR_OLD_STATEID:
5434                 case -NFS4ERR_STALE_STATEID:
5435                 case -NFS4ERR_EXPIRED:
5436                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5437                                                 &calldata->lsp->ls_stateid))
5438                                 rpc_restart_call_prepare(task);
5439                         break;
5440                 default:
5441                         if (nfs4_async_handle_error(task, calldata->server,
5442                                                     NULL, NULL) == -EAGAIN)
5443                                 rpc_restart_call_prepare(task);
5444         }
5445         nfs_release_seqid(calldata->arg.seqid);
5446 }
5447
5448 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5449 {
5450         struct nfs4_unlockdata *calldata = data;
5451
5452         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5453                 goto out_wait;
5454         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5455         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5456                 /* Note: exit _without_ running nfs4_locku_done */
5457                 goto out_no_action;
5458         }
5459         calldata->timestamp = jiffies;
5460         if (nfs4_setup_sequence(calldata->server,
5461                                 &calldata->arg.seq_args,
5462                                 &calldata->res.seq_res,
5463                                 task) != 0)
5464                 nfs_release_seqid(calldata->arg.seqid);
5465         return;
5466 out_no_action:
5467         task->tk_action = NULL;
5468 out_wait:
5469         nfs4_sequence_done(task, &calldata->res.seq_res);
5470 }
5471
5472 static const struct rpc_call_ops nfs4_locku_ops = {
5473         .rpc_call_prepare = nfs4_locku_prepare,
5474         .rpc_call_done = nfs4_locku_done,
5475         .rpc_release = nfs4_locku_release_calldata,
5476 };
5477
5478 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5479                 struct nfs_open_context *ctx,
5480                 struct nfs4_lock_state *lsp,
5481                 struct nfs_seqid *seqid)
5482 {
5483         struct nfs4_unlockdata *data;
5484         struct rpc_message msg = {
5485                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5486                 .rpc_cred = ctx->cred,
5487         };
5488         struct rpc_task_setup task_setup_data = {
5489                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5490                 .rpc_message = &msg,
5491                 .callback_ops = &nfs4_locku_ops,
5492                 .workqueue = nfsiod_workqueue,
5493                 .flags = RPC_TASK_ASYNC,
5494         };
5495
5496         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5497                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5498
5499         /* Ensure this is an unlock - when canceling a lock, the
5500          * canceled lock is passed in, and it won't be an unlock.
5501          */
5502         fl->fl_type = F_UNLCK;
5503
5504         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5505         if (data == NULL) {
5506                 nfs_free_seqid(seqid);
5507                 return ERR_PTR(-ENOMEM);
5508         }
5509
5510         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5511         msg.rpc_argp = &data->arg;
5512         msg.rpc_resp = &data->res;
5513         task_setup_data.callback_data = data;
5514         return rpc_run_task(&task_setup_data);
5515 }
5516
5517 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5518 {
5519         struct inode *inode = state->inode;
5520         struct nfs4_state_owner *sp = state->owner;
5521         struct nfs_inode *nfsi = NFS_I(inode);
5522         struct nfs_seqid *seqid;
5523         struct nfs4_lock_state *lsp;
5524         struct rpc_task *task;
5525         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5526         int status = 0;
5527         unsigned char fl_flags = request->fl_flags;
5528
5529         status = nfs4_set_lock_state(state, request);
5530         /* Unlock _before_ we do the RPC call */
5531         request->fl_flags |= FL_EXISTS;
5532         /* Exclude nfs_delegation_claim_locks() */
5533         mutex_lock(&sp->so_delegreturn_mutex);
5534         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5535         down_read(&nfsi->rwsem);
5536         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5537                 up_read(&nfsi->rwsem);
5538                 mutex_unlock(&sp->so_delegreturn_mutex);
5539                 goto out;
5540         }
5541         up_read(&nfsi->rwsem);
5542         mutex_unlock(&sp->so_delegreturn_mutex);
5543         if (status != 0)
5544                 goto out;
5545         /* Is this a delegated lock? */
5546         lsp = request->fl_u.nfs4_fl.owner;
5547         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5548                 goto out;
5549         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5550         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5551         status = -ENOMEM;
5552         if (IS_ERR(seqid))
5553                 goto out;
5554         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5555         status = PTR_ERR(task);
5556         if (IS_ERR(task))
5557                 goto out;
5558         status = nfs4_wait_for_completion_rpc_task(task);
5559         rpc_put_task(task);
5560 out:
5561         request->fl_flags = fl_flags;
5562         trace_nfs4_unlock(request, state, F_SETLK, status);
5563         return status;
5564 }
5565
5566 struct nfs4_lockdata {
5567         struct nfs_lock_args arg;
5568         struct nfs_lock_res res;
5569         struct nfs4_lock_state *lsp;
5570         struct nfs_open_context *ctx;
5571         struct file_lock fl;
5572         unsigned long timestamp;
5573         int rpc_status;
5574         int cancelled;
5575         struct nfs_server *server;
5576 };
5577
5578 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5579                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5580                 gfp_t gfp_mask)
5581 {
5582         struct nfs4_lockdata *p;
5583         struct inode *inode = lsp->ls_state->inode;
5584         struct nfs_server *server = NFS_SERVER(inode);
5585         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5586
5587         p = kzalloc(sizeof(*p), gfp_mask);
5588         if (p == NULL)
5589                 return NULL;
5590
5591         p->arg.fh = NFS_FH(inode);
5592         p->arg.fl = &p->fl;
5593         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5594         if (IS_ERR(p->arg.open_seqid))
5595                 goto out_free;
5596         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5597         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5598         if (IS_ERR(p->arg.lock_seqid))
5599                 goto out_free_seqid;
5600         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5601         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5602         p->arg.lock_owner.s_dev = server->s_dev;
5603         p->res.lock_seqid = p->arg.lock_seqid;
5604         p->lsp = lsp;
5605         p->server = server;
5606         atomic_inc(&lsp->ls_count);
5607         p->ctx = get_nfs_open_context(ctx);
5608         get_file(fl->fl_file);
5609         memcpy(&p->fl, fl, sizeof(p->fl));
5610         return p;
5611 out_free_seqid:
5612         nfs_free_seqid(p->arg.open_seqid);
5613 out_free:
5614         kfree(p);
5615         return NULL;
5616 }
5617
5618 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5619 {
5620         struct nfs4_lockdata *data = calldata;
5621         struct nfs4_state *state = data->lsp->ls_state;
5622
5623         dprintk("%s: begin!\n", __func__);
5624         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5625                 goto out_wait;
5626         /* Do we need to do an open_to_lock_owner? */
5627         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5628                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5629                         goto out_release_lock_seqid;
5630                 }
5631                 nfs4_stateid_copy(&data->arg.open_stateid,
5632                                 &state->open_stateid);
5633                 data->arg.new_lock_owner = 1;
5634                 data->res.open_seqid = data->arg.open_seqid;
5635         } else {
5636                 data->arg.new_lock_owner = 0;
5637                 nfs4_stateid_copy(&data->arg.lock_stateid,
5638                                 &data->lsp->ls_stateid);
5639         }
5640         if (!nfs4_valid_open_stateid(state)) {
5641                 data->rpc_status = -EBADF;
5642                 task->tk_action = NULL;
5643                 goto out_release_open_seqid;
5644         }
5645         data->timestamp = jiffies;
5646         if (nfs4_setup_sequence(data->server,
5647                                 &data->arg.seq_args,
5648                                 &data->res.seq_res,
5649                                 task) == 0)
5650                 return;
5651 out_release_open_seqid:
5652         nfs_release_seqid(data->arg.open_seqid);
5653 out_release_lock_seqid:
5654         nfs_release_seqid(data->arg.lock_seqid);
5655 out_wait:
5656         nfs4_sequence_done(task, &data->res.seq_res);
5657         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5658 }
5659
5660 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5661 {
5662         struct nfs4_lockdata *data = calldata;
5663         struct nfs4_lock_state *lsp = data->lsp;
5664
5665         dprintk("%s: begin!\n", __func__);
5666
5667         if (!nfs4_sequence_done(task, &data->res.seq_res))
5668                 return;
5669
5670         data->rpc_status = task->tk_status;
5671         switch (task->tk_status) {
5672         case 0:
5673                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5674                                 data->timestamp);
5675                 if (data->arg.new_lock) {
5676                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5677                         if (do_vfs_lock(data->fl.fl_file, &data->fl) < 0) {
5678                                 rpc_restart_call_prepare(task);
5679                                 break;
5680                         }
5681                 }
5682                 if (data->arg.new_lock_owner != 0) {
5683                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5684                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5685                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5686                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5687                         rpc_restart_call_prepare(task);
5688                 break;
5689         case -NFS4ERR_BAD_STATEID:
5690         case -NFS4ERR_OLD_STATEID:
5691         case -NFS4ERR_STALE_STATEID:
5692         case -NFS4ERR_EXPIRED:
5693                 if (data->arg.new_lock_owner != 0) {
5694                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5695                                                 &lsp->ls_state->open_stateid))
5696                                 rpc_restart_call_prepare(task);
5697                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5698                                                 &lsp->ls_stateid))
5699                                 rpc_restart_call_prepare(task);
5700         }
5701         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5702 }
5703
5704 static void nfs4_lock_release(void *calldata)
5705 {
5706         struct nfs4_lockdata *data = calldata;
5707
5708         dprintk("%s: begin!\n", __func__);
5709         nfs_free_seqid(data->arg.open_seqid);
5710         if (data->cancelled != 0) {
5711                 struct rpc_task *task;
5712                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5713                                 data->arg.lock_seqid);
5714                 if (!IS_ERR(task))
5715                         rpc_put_task_async(task);
5716                 dprintk("%s: cancelling lock!\n", __func__);
5717         } else
5718                 nfs_free_seqid(data->arg.lock_seqid);
5719         nfs4_put_lock_state(data->lsp);
5720         put_nfs_open_context(data->ctx);
5721         fput(data->fl.fl_file);
5722         kfree(data);
5723         dprintk("%s: done!\n", __func__);
5724 }
5725
5726 static const struct rpc_call_ops nfs4_lock_ops = {
5727         .rpc_call_prepare = nfs4_lock_prepare,
5728         .rpc_call_done = nfs4_lock_done,
5729         .rpc_release = nfs4_lock_release,
5730 };
5731
5732 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5733 {
5734         switch (error) {
5735         case -NFS4ERR_ADMIN_REVOKED:
5736         case -NFS4ERR_BAD_STATEID:
5737                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5738                 if (new_lock_owner != 0 ||
5739                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5740                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5741                 break;
5742         case -NFS4ERR_STALE_STATEID:
5743                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5744         case -NFS4ERR_EXPIRED:
5745                 nfs4_schedule_lease_recovery(server->nfs_client);
5746         };
5747 }
5748
5749 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5750 {
5751         struct nfs4_lockdata *data;
5752         struct rpc_task *task;
5753         struct rpc_message msg = {
5754                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5755                 .rpc_cred = state->owner->so_cred,
5756         };
5757         struct rpc_task_setup task_setup_data = {
5758                 .rpc_client = NFS_CLIENT(state->inode),
5759                 .rpc_message = &msg,
5760                 .callback_ops = &nfs4_lock_ops,
5761                 .workqueue = nfsiod_workqueue,
5762                 .flags = RPC_TASK_ASYNC,
5763         };
5764         int ret;
5765
5766         dprintk("%s: begin!\n", __func__);
5767         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5768                         fl->fl_u.nfs4_fl.owner,
5769                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5770         if (data == NULL)
5771                 return -ENOMEM;
5772         if (IS_SETLKW(cmd))
5773                 data->arg.block = 1;
5774         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5775         msg.rpc_argp = &data->arg;
5776         msg.rpc_resp = &data->res;
5777         task_setup_data.callback_data = data;
5778         if (recovery_type > NFS_LOCK_NEW) {
5779                 if (recovery_type == NFS_LOCK_RECLAIM)
5780                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5781                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5782         } else
5783                 data->arg.new_lock = 1;
5784         task = rpc_run_task(&task_setup_data);
5785         if (IS_ERR(task))
5786                 return PTR_ERR(task);
5787         ret = nfs4_wait_for_completion_rpc_task(task);
5788         if (ret == 0) {
5789                 ret = data->rpc_status;
5790                 if (ret)
5791                         nfs4_handle_setlk_error(data->server, data->lsp,
5792                                         data->arg.new_lock_owner, ret);
5793         } else
5794                 data->cancelled = 1;
5795         rpc_put_task(task);
5796         dprintk("%s: done, ret = %d!\n", __func__, ret);
5797         return ret;
5798 }
5799
5800 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5801 {
5802         struct nfs_server *server = NFS_SERVER(state->inode);
5803         struct nfs4_exception exception = {
5804                 .inode = state->inode,
5805         };
5806         int err;
5807
5808         do {
5809                 /* Cache the lock if possible... */
5810                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5811                         return 0;
5812                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5813                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5814                 if (err != -NFS4ERR_DELAY)
5815                         break;
5816                 nfs4_handle_exception(server, err, &exception);
5817         } while (exception.retry);
5818         return err;
5819 }
5820
5821 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5822 {
5823         struct nfs_server *server = NFS_SERVER(state->inode);
5824         struct nfs4_exception exception = {
5825                 .inode = state->inode,
5826         };
5827         int err;
5828
5829         err = nfs4_set_lock_state(state, request);
5830         if (err != 0)
5831                 return err;
5832         if (!recover_lost_locks) {
5833                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5834                 return 0;
5835         }
5836         do {
5837                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5838                         return 0;
5839                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5840                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5841                 switch (err) {
5842                 default:
5843                         goto out;
5844                 case -NFS4ERR_GRACE:
5845                 case -NFS4ERR_DELAY:
5846                         nfs4_handle_exception(server, err, &exception);
5847                         err = 0;
5848                 }
5849         } while (exception.retry);
5850 out:
5851         return err;
5852 }
5853
5854 #if defined(CONFIG_NFS_V4_1)
5855 /**
5856  * nfs41_check_expired_locks - possibly free a lock stateid
5857  *
5858  * @state: NFSv4 state for an inode
5859  *
5860  * Returns NFS_OK if recovery for this stateid is now finished.
5861  * Otherwise a negative NFS4ERR value is returned.
5862  */
5863 static int nfs41_check_expired_locks(struct nfs4_state *state)
5864 {
5865         int status, ret = -NFS4ERR_BAD_STATEID;
5866         struct nfs4_lock_state *lsp;
5867         struct nfs_server *server = NFS_SERVER(state->inode);
5868
5869         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5870                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5871                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5872
5873                         status = nfs41_test_stateid(server,
5874                                         &lsp->ls_stateid,
5875                                         cred);
5876                         trace_nfs4_test_lock_stateid(state, lsp, status);
5877                         if (status != NFS_OK) {
5878                                 /* Free the stateid unless the server
5879                                  * informs us the stateid is unrecognized. */
5880                                 if (status != -NFS4ERR_BAD_STATEID)
5881                                         nfs41_free_stateid(server,
5882                                                         &lsp->ls_stateid,
5883                                                         cred);
5884                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5885                                 ret = status;
5886                         }
5887                 }
5888         };
5889
5890         return ret;
5891 }
5892
5893 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5894 {
5895         int status = NFS_OK;
5896
5897         if (test_bit(LK_STATE_IN_USE, &state->flags))
5898                 status = nfs41_check_expired_locks(state);
5899         if (status != NFS_OK)
5900                 status = nfs4_lock_expired(state, request);
5901         return status;
5902 }
5903 #endif
5904
5905 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5906 {
5907         struct nfs_inode *nfsi = NFS_I(state->inode);
5908         unsigned char fl_flags = request->fl_flags;
5909         int status = -ENOLCK;
5910
5911         if ((fl_flags & FL_POSIX) &&
5912                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5913                 goto out;
5914         /* Is this a delegated open? */
5915         status = nfs4_set_lock_state(state, request);
5916         if (status != 0)
5917                 goto out;
5918         request->fl_flags |= FL_ACCESS;
5919         status = do_vfs_lock(request->fl_file, request);
5920         if (status < 0)
5921                 goto out;
5922         down_read(&nfsi->rwsem);
5923         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5924                 /* Yes: cache locks! */
5925                 /* ...but avoid races with delegation recall... */
5926                 request->fl_flags = fl_flags & ~FL_SLEEP;
5927                 status = do_vfs_lock(request->fl_file, request);
5928                 up_read(&nfsi->rwsem);
5929                 goto out;
5930         }
5931         up_read(&nfsi->rwsem);
5932         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5933 out:
5934         request->fl_flags = fl_flags;
5935         return status;
5936 }
5937
5938 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5939 {
5940         struct nfs4_exception exception = {
5941                 .state = state,
5942                 .inode = state->inode,
5943         };
5944         int err;
5945
5946         do {
5947                 err = _nfs4_proc_setlk(state, cmd, request);
5948                 trace_nfs4_set_lock(request, state, cmd, err);
5949                 if (err == -NFS4ERR_DENIED)
5950                         err = -EAGAIN;
5951                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5952                                 err, &exception);
5953         } while (exception.retry);
5954         return err;
5955 }
5956
5957 static int
5958 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5959 {
5960         struct nfs_open_context *ctx;
5961         struct nfs4_state *state;
5962         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5963         int status;
5964
5965         /* verify open state */
5966         ctx = nfs_file_open_context(filp);
5967         state = ctx->state;
5968
5969         if (request->fl_start < 0 || request->fl_end < 0)
5970                 return -EINVAL;
5971
5972         if (IS_GETLK(cmd)) {
5973                 if (state != NULL)
5974                         return nfs4_proc_getlk(state, F_GETLK, request);
5975                 return 0;
5976         }
5977
5978         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5979                 return -EINVAL;
5980
5981         if (request->fl_type == F_UNLCK) {
5982                 if (state != NULL)
5983                         return nfs4_proc_unlck(state, cmd, request);
5984                 return 0;
5985         }
5986
5987         if (state == NULL)
5988                 return -ENOLCK;
5989         /*
5990          * Don't rely on the VFS having checked the file open mode,
5991          * since it won't do this for flock() locks.
5992          */
5993         switch (request->fl_type) {
5994         case F_RDLCK:
5995                 if (!(filp->f_mode & FMODE_READ))
5996                         return -EBADF;
5997                 break;
5998         case F_WRLCK:
5999                 if (!(filp->f_mode & FMODE_WRITE))
6000                         return -EBADF;
6001         }
6002
6003         do {
6004                 status = nfs4_proc_setlk(state, cmd, request);
6005                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6006                         break;
6007                 timeout = nfs4_set_lock_task_retry(timeout);
6008                 status = -ERESTARTSYS;
6009                 if (signalled())
6010                         break;
6011         } while(status < 0);
6012         return status;
6013 }
6014
6015 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6016 {
6017         struct nfs_server *server = NFS_SERVER(state->inode);
6018         int err;
6019
6020         err = nfs4_set_lock_state(state, fl);
6021         if (err != 0)
6022                 return err;
6023         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6024         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6025 }
6026
6027 struct nfs_release_lockowner_data {
6028         struct nfs4_lock_state *lsp;
6029         struct nfs_server *server;
6030         struct nfs_release_lockowner_args args;
6031         struct nfs_release_lockowner_res res;
6032         unsigned long timestamp;
6033 };
6034
6035 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6036 {
6037         struct nfs_release_lockowner_data *data = calldata;
6038         struct nfs_server *server = data->server;
6039         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6040                              &data->args.seq_args, &data->res.seq_res, task);
6041         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6042         data->timestamp = jiffies;
6043 }
6044
6045 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6046 {
6047         struct nfs_release_lockowner_data *data = calldata;
6048         struct nfs_server *server = data->server;
6049
6050         nfs40_sequence_done(task, &data->res.seq_res);
6051
6052         switch (task->tk_status) {
6053         case 0:
6054                 renew_lease(server, data->timestamp);
6055                 break;
6056         case -NFS4ERR_STALE_CLIENTID:
6057         case -NFS4ERR_EXPIRED:
6058                 nfs4_schedule_lease_recovery(server->nfs_client);
6059                 break;
6060         case -NFS4ERR_LEASE_MOVED:
6061         case -NFS4ERR_DELAY:
6062                 if (nfs4_async_handle_error(task, server,
6063                                             NULL, NULL) == -EAGAIN)
6064                         rpc_restart_call_prepare(task);
6065         }
6066 }
6067
6068 static void nfs4_release_lockowner_release(void *calldata)
6069 {
6070         struct nfs_release_lockowner_data *data = calldata;
6071         nfs4_free_lock_state(data->server, data->lsp);
6072         kfree(calldata);
6073 }
6074
6075 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6076         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6077         .rpc_call_done = nfs4_release_lockowner_done,
6078         .rpc_release = nfs4_release_lockowner_release,
6079 };
6080
6081 static void
6082 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6083 {
6084         struct nfs_release_lockowner_data *data;
6085         struct rpc_message msg = {
6086                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6087         };
6088
6089         if (server->nfs_client->cl_mvops->minor_version != 0)
6090                 return;
6091
6092         data = kmalloc(sizeof(*data), GFP_NOFS);
6093         if (!data)
6094                 return;
6095         data->lsp = lsp;
6096         data->server = server;
6097         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6098         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6099         data->args.lock_owner.s_dev = server->s_dev;
6100
6101         msg.rpc_argp = &data->args;
6102         msg.rpc_resp = &data->res;
6103         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6104         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6105 }
6106
6107 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6108
6109 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6110                                    const void *buf, size_t buflen,
6111                                    int flags, int type)
6112 {
6113         if (strcmp(key, "") != 0)
6114                 return -EINVAL;
6115
6116         return nfs4_proc_set_acl(d_inode(dentry), buf, buflen);
6117 }
6118
6119 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6120                                    void *buf, size_t buflen, int type)
6121 {
6122         if (strcmp(key, "") != 0)
6123                 return -EINVAL;
6124
6125         return nfs4_proc_get_acl(d_inode(dentry), buf, buflen);
6126 }
6127
6128 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6129                                        size_t list_len, const char *name,
6130                                        size_t name_len, int type)
6131 {
6132         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6133
6134         if (!nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))))
6135                 return 0;
6136
6137         if (list && len <= list_len)
6138                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6139         return len;
6140 }
6141
6142 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6143 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6144 {
6145         return server->caps & NFS_CAP_SECURITY_LABEL;
6146 }
6147
6148 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6149                                    const void *buf, size_t buflen,
6150                                    int flags, int type)
6151 {
6152         if (security_ismaclabel(key))
6153                 return nfs4_set_security_label(dentry, buf, buflen);
6154
6155         return -EOPNOTSUPP;
6156 }
6157
6158 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6159                                    void *buf, size_t buflen, int type)
6160 {
6161         if (security_ismaclabel(key))
6162                 return nfs4_get_security_label(d_inode(dentry), buf, buflen);
6163         return -EOPNOTSUPP;
6164 }
6165
6166 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6167                                        size_t list_len, const char *name,
6168                                        size_t name_len, int type)
6169 {
6170         size_t len = 0;
6171
6172         if (nfs_server_capable(d_inode(dentry), NFS_CAP_SECURITY_LABEL)) {
6173                 len = security_inode_listsecurity(d_inode(dentry), NULL, 0);
6174                 if (list && len <= list_len)
6175                         security_inode_listsecurity(d_inode(dentry), list, len);
6176         }
6177         return len;
6178 }
6179
6180 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6181         .prefix = XATTR_SECURITY_PREFIX,
6182         .list   = nfs4_xattr_list_nfs4_label,
6183         .get    = nfs4_xattr_get_nfs4_label,
6184         .set    = nfs4_xattr_set_nfs4_label,
6185 };
6186 #endif
6187
6188
6189 /*
6190  * nfs_fhget will use either the mounted_on_fileid or the fileid
6191  */
6192 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6193 {
6194         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6195                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6196               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6197               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6198                 return;
6199
6200         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6201                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6202         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6203         fattr->nlink = 2;
6204 }
6205
6206 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6207                                    const struct qstr *name,
6208                                    struct nfs4_fs_locations *fs_locations,
6209                                    struct page *page)
6210 {
6211         struct nfs_server *server = NFS_SERVER(dir);
6212         u32 bitmask[3] = {
6213                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6214         };
6215         struct nfs4_fs_locations_arg args = {
6216                 .dir_fh = NFS_FH(dir),
6217                 .name = name,
6218                 .page = page,
6219                 .bitmask = bitmask,
6220         };
6221         struct nfs4_fs_locations_res res = {
6222                 .fs_locations = fs_locations,
6223         };
6224         struct rpc_message msg = {
6225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6226                 .rpc_argp = &args,
6227                 .rpc_resp = &res,
6228         };
6229         int status;
6230
6231         dprintk("%s: start\n", __func__);
6232
6233         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6234          * is not supported */
6235         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6236                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6237         else
6238                 bitmask[0] |= FATTR4_WORD0_FILEID;
6239
6240         nfs_fattr_init(&fs_locations->fattr);
6241         fs_locations->server = server;
6242         fs_locations->nlocations = 0;
6243         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6244         dprintk("%s: returned status = %d\n", __func__, status);
6245         return status;
6246 }
6247
6248 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6249                            const struct qstr *name,
6250                            struct nfs4_fs_locations *fs_locations,
6251                            struct page *page)
6252 {
6253         struct nfs4_exception exception = { };
6254         int err;
6255         do {
6256                 err = _nfs4_proc_fs_locations(client, dir, name,
6257                                 fs_locations, page);
6258                 trace_nfs4_get_fs_locations(dir, name, err);
6259                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6260                                 &exception);
6261         } while (exception.retry);
6262         return err;
6263 }
6264
6265 /*
6266  * This operation also signals the server that this client is
6267  * performing migration recovery.  The server can stop returning
6268  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6269  * appended to this compound to identify the client ID which is
6270  * performing recovery.
6271  */
6272 static int _nfs40_proc_get_locations(struct inode *inode,
6273                                      struct nfs4_fs_locations *locations,
6274                                      struct page *page, struct rpc_cred *cred)
6275 {
6276         struct nfs_server *server = NFS_SERVER(inode);
6277         struct rpc_clnt *clnt = server->client;
6278         u32 bitmask[2] = {
6279                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6280         };
6281         struct nfs4_fs_locations_arg args = {
6282                 .clientid       = server->nfs_client->cl_clientid,
6283                 .fh             = NFS_FH(inode),
6284                 .page           = page,
6285                 .bitmask        = bitmask,
6286                 .migration      = 1,            /* skip LOOKUP */
6287                 .renew          = 1,            /* append RENEW */
6288         };
6289         struct nfs4_fs_locations_res res = {
6290                 .fs_locations   = locations,
6291                 .migration      = 1,
6292                 .renew          = 1,
6293         };
6294         struct rpc_message msg = {
6295                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6296                 .rpc_argp       = &args,
6297                 .rpc_resp       = &res,
6298                 .rpc_cred       = cred,
6299         };
6300         unsigned long now = jiffies;
6301         int status;
6302
6303         nfs_fattr_init(&locations->fattr);
6304         locations->server = server;
6305         locations->nlocations = 0;
6306
6307         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6308         nfs4_set_sequence_privileged(&args.seq_args);
6309         status = nfs4_call_sync_sequence(clnt, server, &msg,
6310                                         &args.seq_args, &res.seq_res);
6311         if (status)
6312                 return status;
6313
6314         renew_lease(server, now);
6315         return 0;
6316 }
6317
6318 #ifdef CONFIG_NFS_V4_1
6319
6320 /*
6321  * This operation also signals the server that this client is
6322  * performing migration recovery.  The server can stop asserting
6323  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6324  * performing this operation is identified in the SEQUENCE
6325  * operation in this compound.
6326  *
6327  * When the client supports GETATTR(fs_locations_info), it can
6328  * be plumbed in here.
6329  */
6330 static int _nfs41_proc_get_locations(struct inode *inode,
6331                                      struct nfs4_fs_locations *locations,
6332                                      struct page *page, struct rpc_cred *cred)
6333 {
6334         struct nfs_server *server = NFS_SERVER(inode);
6335         struct rpc_clnt *clnt = server->client;
6336         u32 bitmask[2] = {
6337                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6338         };
6339         struct nfs4_fs_locations_arg args = {
6340                 .fh             = NFS_FH(inode),
6341                 .page           = page,
6342                 .bitmask        = bitmask,
6343                 .migration      = 1,            /* skip LOOKUP */
6344         };
6345         struct nfs4_fs_locations_res res = {
6346                 .fs_locations   = locations,
6347                 .migration      = 1,
6348         };
6349         struct rpc_message msg = {
6350                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6351                 .rpc_argp       = &args,
6352                 .rpc_resp       = &res,
6353                 .rpc_cred       = cred,
6354         };
6355         int status;
6356
6357         nfs_fattr_init(&locations->fattr);
6358         locations->server = server;
6359         locations->nlocations = 0;
6360
6361         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6362         nfs4_set_sequence_privileged(&args.seq_args);
6363         status = nfs4_call_sync_sequence(clnt, server, &msg,
6364                                         &args.seq_args, &res.seq_res);
6365         if (status == NFS4_OK &&
6366             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6367                 status = -NFS4ERR_LEASE_MOVED;
6368         return status;
6369 }
6370
6371 #endif  /* CONFIG_NFS_V4_1 */
6372
6373 /**
6374  * nfs4_proc_get_locations - discover locations for a migrated FSID
6375  * @inode: inode on FSID that is migrating
6376  * @locations: result of query
6377  * @page: buffer
6378  * @cred: credential to use for this operation
6379  *
6380  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6381  * operation failed, or a negative errno if a local error occurred.
6382  *
6383  * On success, "locations" is filled in, but if the server has
6384  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6385  * asserted.
6386  *
6387  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6388  * from this client that require migration recovery.
6389  */
6390 int nfs4_proc_get_locations(struct inode *inode,
6391                             struct nfs4_fs_locations *locations,
6392                             struct page *page, struct rpc_cred *cred)
6393 {
6394         struct nfs_server *server = NFS_SERVER(inode);
6395         struct nfs_client *clp = server->nfs_client;
6396         const struct nfs4_mig_recovery_ops *ops =
6397                                         clp->cl_mvops->mig_recovery_ops;
6398         struct nfs4_exception exception = { };
6399         int status;
6400
6401         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6402                 (unsigned long long)server->fsid.major,
6403                 (unsigned long long)server->fsid.minor,
6404                 clp->cl_hostname);
6405         nfs_display_fhandle(NFS_FH(inode), __func__);
6406
6407         do {
6408                 status = ops->get_locations(inode, locations, page, cred);
6409                 if (status != -NFS4ERR_DELAY)
6410                         break;
6411                 nfs4_handle_exception(server, status, &exception);
6412         } while (exception.retry);
6413         return status;
6414 }
6415
6416 /*
6417  * This operation also signals the server that this client is
6418  * performing "lease moved" recovery.  The server can stop
6419  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6420  * is appended to this compound to identify the client ID which is
6421  * performing recovery.
6422  */
6423 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6424 {
6425         struct nfs_server *server = NFS_SERVER(inode);
6426         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6427         struct rpc_clnt *clnt = server->client;
6428         struct nfs4_fsid_present_arg args = {
6429                 .fh             = NFS_FH(inode),
6430                 .clientid       = clp->cl_clientid,
6431                 .renew          = 1,            /* append RENEW */
6432         };
6433         struct nfs4_fsid_present_res res = {
6434                 .renew          = 1,
6435         };
6436         struct rpc_message msg = {
6437                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6438                 .rpc_argp       = &args,
6439                 .rpc_resp       = &res,
6440                 .rpc_cred       = cred,
6441         };
6442         unsigned long now = jiffies;
6443         int status;
6444
6445         res.fh = nfs_alloc_fhandle();
6446         if (res.fh == NULL)
6447                 return -ENOMEM;
6448
6449         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6450         nfs4_set_sequence_privileged(&args.seq_args);
6451         status = nfs4_call_sync_sequence(clnt, server, &msg,
6452                                                 &args.seq_args, &res.seq_res);
6453         nfs_free_fhandle(res.fh);
6454         if (status)
6455                 return status;
6456
6457         do_renew_lease(clp, now);
6458         return 0;
6459 }
6460
6461 #ifdef CONFIG_NFS_V4_1
6462
6463 /*
6464  * This operation also signals the server that this client is
6465  * performing "lease moved" recovery.  The server can stop asserting
6466  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6467  * this operation is identified in the SEQUENCE operation in this
6468  * compound.
6469  */
6470 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6471 {
6472         struct nfs_server *server = NFS_SERVER(inode);
6473         struct rpc_clnt *clnt = server->client;
6474         struct nfs4_fsid_present_arg args = {
6475                 .fh             = NFS_FH(inode),
6476         };
6477         struct nfs4_fsid_present_res res = {
6478         };
6479         struct rpc_message msg = {
6480                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6481                 .rpc_argp       = &args,
6482                 .rpc_resp       = &res,
6483                 .rpc_cred       = cred,
6484         };
6485         int status;
6486
6487         res.fh = nfs_alloc_fhandle();
6488         if (res.fh == NULL)
6489                 return -ENOMEM;
6490
6491         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6492         nfs4_set_sequence_privileged(&args.seq_args);
6493         status = nfs4_call_sync_sequence(clnt, server, &msg,
6494                                                 &args.seq_args, &res.seq_res);
6495         nfs_free_fhandle(res.fh);
6496         if (status == NFS4_OK &&
6497             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6498                 status = -NFS4ERR_LEASE_MOVED;
6499         return status;
6500 }
6501
6502 #endif  /* CONFIG_NFS_V4_1 */
6503
6504 /**
6505  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6506  * @inode: inode on FSID to check
6507  * @cred: credential to use for this operation
6508  *
6509  * Server indicates whether the FSID is present, moved, or not
6510  * recognized.  This operation is necessary to clear a LEASE_MOVED
6511  * condition for this client ID.
6512  *
6513  * Returns NFS4_OK if the FSID is present on this server,
6514  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6515  *  NFS4ERR code if some error occurred on the server, or a
6516  *  negative errno if a local failure occurred.
6517  */
6518 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6519 {
6520         struct nfs_server *server = NFS_SERVER(inode);
6521         struct nfs_client *clp = server->nfs_client;
6522         const struct nfs4_mig_recovery_ops *ops =
6523                                         clp->cl_mvops->mig_recovery_ops;
6524         struct nfs4_exception exception = { };
6525         int status;
6526
6527         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6528                 (unsigned long long)server->fsid.major,
6529                 (unsigned long long)server->fsid.minor,
6530                 clp->cl_hostname);
6531         nfs_display_fhandle(NFS_FH(inode), __func__);
6532
6533         do {
6534                 status = ops->fsid_present(inode, cred);
6535                 if (status != -NFS4ERR_DELAY)
6536                         break;
6537                 nfs4_handle_exception(server, status, &exception);
6538         } while (exception.retry);
6539         return status;
6540 }
6541
6542 /**
6543  * If 'use_integrity' is true and the state managment nfs_client
6544  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6545  * and the machine credential as per RFC3530bis and RFC5661 Security
6546  * Considerations sections. Otherwise, just use the user cred with the
6547  * filesystem's rpc_client.
6548  */
6549 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6550 {
6551         int status;
6552         struct nfs4_secinfo_arg args = {
6553                 .dir_fh = NFS_FH(dir),
6554                 .name   = name,
6555         };
6556         struct nfs4_secinfo_res res = {
6557                 .flavors     = flavors,
6558         };
6559         struct rpc_message msg = {
6560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6561                 .rpc_argp = &args,
6562                 .rpc_resp = &res,
6563         };
6564         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6565         struct rpc_cred *cred = NULL;
6566
6567         if (use_integrity) {
6568                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6569                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6570                 msg.rpc_cred = cred;
6571         }
6572
6573         dprintk("NFS call  secinfo %s\n", name->name);
6574
6575         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6576                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6577
6578         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6579                                 &res.seq_res, 0);
6580         dprintk("NFS reply  secinfo: %d\n", status);
6581
6582         if (cred)
6583                 put_rpccred(cred);
6584
6585         return status;
6586 }
6587
6588 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6589                       struct nfs4_secinfo_flavors *flavors)
6590 {
6591         struct nfs4_exception exception = { };
6592         int err;
6593         do {
6594                 err = -NFS4ERR_WRONGSEC;
6595
6596                 /* try to use integrity protection with machine cred */
6597                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6598                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6599
6600                 /*
6601                  * if unable to use integrity protection, or SECINFO with
6602                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6603                  * disallowed by spec, but exists in deployed servers) use
6604                  * the current filesystem's rpc_client and the user cred.
6605                  */
6606                 if (err == -NFS4ERR_WRONGSEC)
6607                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6608
6609                 trace_nfs4_secinfo(dir, name, err);
6610                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6611                                 &exception);
6612         } while (exception.retry);
6613         return err;
6614 }
6615
6616 #ifdef CONFIG_NFS_V4_1
6617 /*
6618  * Check the exchange flags returned by the server for invalid flags, having
6619  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6620  * DS flags set.
6621  */
6622 static int nfs4_check_cl_exchange_flags(u32 flags)
6623 {
6624         if (flags & ~EXCHGID4_FLAG_MASK_R)
6625                 goto out_inval;
6626         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6627             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6628                 goto out_inval;
6629         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6630                 goto out_inval;
6631         return NFS_OK;
6632 out_inval:
6633         return -NFS4ERR_INVAL;
6634 }
6635
6636 static bool
6637 nfs41_same_server_scope(struct nfs41_server_scope *a,
6638                         struct nfs41_server_scope *b)
6639 {
6640         if (a->server_scope_sz == b->server_scope_sz &&
6641             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6642                 return true;
6643
6644         return false;
6645 }
6646
6647 /*
6648  * nfs4_proc_bind_conn_to_session()
6649  *
6650  * The 4.1 client currently uses the same TCP connection for the
6651  * fore and backchannel.
6652  */
6653 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6654 {
6655         int status;
6656         struct nfs41_bind_conn_to_session_args args = {
6657                 .client = clp,
6658                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
6659         };
6660         struct nfs41_bind_conn_to_session_res res;
6661         struct rpc_message msg = {
6662                 .rpc_proc =
6663                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6664                 .rpc_argp = &args,
6665                 .rpc_resp = &res,
6666                 .rpc_cred = cred,
6667         };
6668
6669         dprintk("--> %s\n", __func__);
6670
6671         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
6672         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
6673                 args.dir = NFS4_CDFC4_FORE;
6674
6675         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6676         trace_nfs4_bind_conn_to_session(clp, status);
6677         if (status == 0) {
6678                 if (memcmp(res.sessionid.data,
6679                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6680                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6681                         status = -EIO;
6682                         goto out;
6683                 }
6684                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
6685                         dprintk("NFS: %s: Unexpected direction from server\n",
6686                                 __func__);
6687                         status = -EIO;
6688                         goto out;
6689                 }
6690                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
6691                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6692                                 __func__);
6693                         status = -EIO;
6694                         goto out;
6695                 }
6696         }
6697 out:
6698         dprintk("<-- %s status= %d\n", __func__, status);
6699         return status;
6700 }
6701
6702 /*
6703  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6704  * and operations we'd like to see to enable certain features in the allow map
6705  */
6706 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6707         .how = SP4_MACH_CRED,
6708         .enforce.u.words = {
6709                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6710                       1 << (OP_EXCHANGE_ID - 32) |
6711                       1 << (OP_CREATE_SESSION - 32) |
6712                       1 << (OP_DESTROY_SESSION - 32) |
6713                       1 << (OP_DESTROY_CLIENTID - 32)
6714         },
6715         .allow.u.words = {
6716                 [0] = 1 << (OP_CLOSE) |
6717                       1 << (OP_LOCKU) |
6718                       1 << (OP_COMMIT),
6719                 [1] = 1 << (OP_SECINFO - 32) |
6720                       1 << (OP_SECINFO_NO_NAME - 32) |
6721                       1 << (OP_TEST_STATEID - 32) |
6722                       1 << (OP_FREE_STATEID - 32) |
6723                       1 << (OP_WRITE - 32)
6724         }
6725 };
6726
6727 /*
6728  * Select the state protection mode for client `clp' given the server results
6729  * from exchange_id in `sp'.
6730  *
6731  * Returns 0 on success, negative errno otherwise.
6732  */
6733 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6734                                  struct nfs41_state_protection *sp)
6735 {
6736         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6737                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6738                       1 << (OP_EXCHANGE_ID - 32) |
6739                       1 << (OP_CREATE_SESSION - 32) |
6740                       1 << (OP_DESTROY_SESSION - 32) |
6741                       1 << (OP_DESTROY_CLIENTID - 32)
6742         };
6743         unsigned int i;
6744
6745         if (sp->how == SP4_MACH_CRED) {
6746                 /* Print state protect result */
6747                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6748                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6749                         if (test_bit(i, sp->enforce.u.longs))
6750                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6751                         if (test_bit(i, sp->allow.u.longs))
6752                                 dfprintk(MOUNT, "  allow op %d\n", i);
6753                 }
6754
6755                 /* make sure nothing is on enforce list that isn't supported */
6756                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6757                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6758                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6759                                 return -EINVAL;
6760                         }
6761                 }
6762
6763                 /*
6764                  * Minimal mode - state operations are allowed to use machine
6765                  * credential.  Note this already happens by default, so the
6766                  * client doesn't have to do anything more than the negotiation.
6767                  *
6768                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6769                  *       we're already using the machine cred for exchange_id
6770                  *       and will never use a different cred.
6771                  */
6772                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6773                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6774                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6775                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6776                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6777                         dfprintk(MOUNT, "  minimal mode enabled\n");
6778                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6779                 } else {
6780                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6781                         return -EINVAL;
6782                 }
6783
6784                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6785                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6786                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6787                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6788                 }
6789
6790                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6791                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6792                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6793                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6794                 }
6795
6796                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6797                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6798                         dfprintk(MOUNT, "  stateid mode enabled\n");
6799                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6800                 }
6801
6802                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6803                         dfprintk(MOUNT, "  write mode enabled\n");
6804                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6805                 }
6806
6807                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6808                         dfprintk(MOUNT, "  commit mode enabled\n");
6809                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6810                 }
6811         }
6812
6813         return 0;
6814 }
6815
6816 /*
6817  * _nfs4_proc_exchange_id()
6818  *
6819  * Wrapper for EXCHANGE_ID operation.
6820  */
6821 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6822         u32 sp4_how)
6823 {
6824         nfs4_verifier verifier;
6825         struct nfs41_exchange_id_args args = {
6826                 .verifier = &verifier,
6827                 .client = clp,
6828 #ifdef CONFIG_NFS_V4_1_MIGRATION
6829                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6830                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6831                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6832 #else
6833                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6834                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6835 #endif
6836         };
6837         struct nfs41_exchange_id_res res = {
6838                 0
6839         };
6840         int status;
6841         struct rpc_message msg = {
6842                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6843                 .rpc_argp = &args,
6844                 .rpc_resp = &res,
6845                 .rpc_cred = cred,
6846         };
6847
6848         nfs4_init_boot_verifier(clp, &verifier);
6849         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6850                                                         sizeof(args.id));
6851         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6852                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6853                 args.id_len, args.id);
6854
6855         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6856                                         GFP_NOFS);
6857         if (unlikely(res.server_owner == NULL)) {
6858                 status = -ENOMEM;
6859                 goto out;
6860         }
6861
6862         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6863                                         GFP_NOFS);
6864         if (unlikely(res.server_scope == NULL)) {
6865                 status = -ENOMEM;
6866                 goto out_server_owner;
6867         }
6868
6869         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6870         if (unlikely(res.impl_id == NULL)) {
6871                 status = -ENOMEM;
6872                 goto out_server_scope;
6873         }
6874
6875         switch (sp4_how) {
6876         case SP4_NONE:
6877                 args.state_protect.how = SP4_NONE;
6878                 break;
6879
6880         case SP4_MACH_CRED:
6881                 args.state_protect = nfs4_sp4_mach_cred_request;
6882                 break;
6883
6884         default:
6885                 /* unsupported! */
6886                 WARN_ON_ONCE(1);
6887                 status = -EINVAL;
6888                 goto out_server_scope;
6889         }
6890
6891         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6892         trace_nfs4_exchange_id(clp, status);
6893         if (status == 0)
6894                 status = nfs4_check_cl_exchange_flags(res.flags);
6895
6896         if (status == 0)
6897                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6898
6899         if (status == 0) {
6900                 clp->cl_clientid = res.clientid;
6901                 clp->cl_exchange_flags = res.flags;
6902                 /* Client ID is not confirmed */
6903                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
6904                         clear_bit(NFS4_SESSION_ESTABLISHED,
6905                                         &clp->cl_session->session_state);
6906                         clp->cl_seqid = res.seqid;
6907                 }
6908
6909                 kfree(clp->cl_serverowner);
6910                 clp->cl_serverowner = res.server_owner;
6911                 res.server_owner = NULL;
6912
6913                 /* use the most recent implementation id */
6914                 kfree(clp->cl_implid);
6915                 clp->cl_implid = res.impl_id;
6916
6917                 if (clp->cl_serverscope != NULL &&
6918                     !nfs41_same_server_scope(clp->cl_serverscope,
6919                                              res.server_scope)) {
6920                         dprintk("%s: server_scope mismatch detected\n",
6921                                 __func__);
6922                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6923                         kfree(clp->cl_serverscope);
6924                         clp->cl_serverscope = NULL;
6925                 }
6926
6927                 if (clp->cl_serverscope == NULL) {
6928                         clp->cl_serverscope = res.server_scope;
6929                         goto out;
6930                 }
6931         } else
6932                 kfree(res.impl_id);
6933
6934 out_server_owner:
6935         kfree(res.server_owner);
6936 out_server_scope:
6937         kfree(res.server_scope);
6938 out:
6939         if (clp->cl_implid != NULL)
6940                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6941                         "domain: %s, name: %s, date: %llu,%u\n",
6942                         clp->cl_implid->domain, clp->cl_implid->name,
6943                         clp->cl_implid->date.seconds,
6944                         clp->cl_implid->date.nseconds);
6945         dprintk("NFS reply exchange_id: %d\n", status);
6946         return status;
6947 }
6948
6949 /*
6950  * nfs4_proc_exchange_id()
6951  *
6952  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6953  *
6954  * Since the clientid has expired, all compounds using sessions
6955  * associated with the stale clientid will be returning
6956  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6957  * be in some phase of session reset.
6958  *
6959  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6960  */
6961 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6962 {
6963         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6964         int status;
6965
6966         /* try SP4_MACH_CRED if krb5i/p */
6967         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6968             authflavor == RPC_AUTH_GSS_KRB5P) {
6969                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6970                 if (!status)
6971                         return 0;
6972         }
6973
6974         /* try SP4_NONE */
6975         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6976 }
6977
6978 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6979                 struct rpc_cred *cred)
6980 {
6981         struct rpc_message msg = {
6982                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6983                 .rpc_argp = clp,
6984                 .rpc_cred = cred,
6985         };
6986         int status;
6987
6988         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6989         trace_nfs4_destroy_clientid(clp, status);
6990         if (status)
6991                 dprintk("NFS: Got error %d from the server %s on "
6992                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6993         return status;
6994 }
6995
6996 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6997                 struct rpc_cred *cred)
6998 {
6999         unsigned int loop;
7000         int ret;
7001
7002         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7003                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7004                 switch (ret) {
7005                 case -NFS4ERR_DELAY:
7006                 case -NFS4ERR_CLIENTID_BUSY:
7007                         ssleep(1);
7008                         break;
7009                 default:
7010                         return ret;
7011                 }
7012         }
7013         return 0;
7014 }
7015
7016 int nfs4_destroy_clientid(struct nfs_client *clp)
7017 {
7018         struct rpc_cred *cred;
7019         int ret = 0;
7020
7021         if (clp->cl_mvops->minor_version < 1)
7022                 goto out;
7023         if (clp->cl_exchange_flags == 0)
7024                 goto out;
7025         if (clp->cl_preserve_clid)
7026                 goto out;
7027         cred = nfs4_get_clid_cred(clp);
7028         ret = nfs4_proc_destroy_clientid(clp, cred);
7029         if (cred)
7030                 put_rpccred(cred);
7031         switch (ret) {
7032         case 0:
7033         case -NFS4ERR_STALE_CLIENTID:
7034                 clp->cl_exchange_flags = 0;
7035         }
7036 out:
7037         return ret;
7038 }
7039
7040 struct nfs4_get_lease_time_data {
7041         struct nfs4_get_lease_time_args *args;
7042         struct nfs4_get_lease_time_res *res;
7043         struct nfs_client *clp;
7044 };
7045
7046 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7047                                         void *calldata)
7048 {
7049         struct nfs4_get_lease_time_data *data =
7050                         (struct nfs4_get_lease_time_data *)calldata;
7051
7052         dprintk("--> %s\n", __func__);
7053         /* just setup sequence, do not trigger session recovery
7054            since we're invoked within one */
7055         nfs41_setup_sequence(data->clp->cl_session,
7056                         &data->args->la_seq_args,
7057                         &data->res->lr_seq_res,
7058                         task);
7059         dprintk("<-- %s\n", __func__);
7060 }
7061
7062 /*
7063  * Called from nfs4_state_manager thread for session setup, so don't recover
7064  * from sequence operation or clientid errors.
7065  */
7066 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7067 {
7068         struct nfs4_get_lease_time_data *data =
7069                         (struct nfs4_get_lease_time_data *)calldata;
7070
7071         dprintk("--> %s\n", __func__);
7072         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7073                 return;
7074         switch (task->tk_status) {
7075         case -NFS4ERR_DELAY:
7076         case -NFS4ERR_GRACE:
7077                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7078                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7079                 task->tk_status = 0;
7080                 /* fall through */
7081         case -NFS4ERR_RETRY_UNCACHED_REP:
7082                 rpc_restart_call_prepare(task);
7083                 return;
7084         }
7085         dprintk("<-- %s\n", __func__);
7086 }
7087
7088 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7089         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7090         .rpc_call_done = nfs4_get_lease_time_done,
7091 };
7092
7093 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7094 {
7095         struct rpc_task *task;
7096         struct nfs4_get_lease_time_args args;
7097         struct nfs4_get_lease_time_res res = {
7098                 .lr_fsinfo = fsinfo,
7099         };
7100         struct nfs4_get_lease_time_data data = {
7101                 .args = &args,
7102                 .res = &res,
7103                 .clp = clp,
7104         };
7105         struct rpc_message msg = {
7106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7107                 .rpc_argp = &args,
7108                 .rpc_resp = &res,
7109         };
7110         struct rpc_task_setup task_setup = {
7111                 .rpc_client = clp->cl_rpcclient,
7112                 .rpc_message = &msg,
7113                 .callback_ops = &nfs4_get_lease_time_ops,
7114                 .callback_data = &data,
7115                 .flags = RPC_TASK_TIMEOUT,
7116         };
7117         int status;
7118
7119         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7120         nfs4_set_sequence_privileged(&args.la_seq_args);
7121         dprintk("--> %s\n", __func__);
7122         task = rpc_run_task(&task_setup);
7123
7124         if (IS_ERR(task))
7125                 status = PTR_ERR(task);
7126         else {
7127                 status = task->tk_status;
7128                 rpc_put_task(task);
7129         }
7130         dprintk("<-- %s return %d\n", __func__, status);
7131
7132         return status;
7133 }
7134
7135 /*
7136  * Initialize the values to be used by the client in CREATE_SESSION
7137  * If nfs4_init_session set the fore channel request and response sizes,
7138  * use them.
7139  *
7140  * Set the back channel max_resp_sz_cached to zero to force the client to
7141  * always set csa_cachethis to FALSE because the current implementation
7142  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7143  */
7144 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7145 {
7146         unsigned int max_rqst_sz, max_resp_sz;
7147
7148         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7149         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7150
7151         /* Fore channel attributes */
7152         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7153         args->fc_attrs.max_resp_sz = max_resp_sz;
7154         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7155         args->fc_attrs.max_reqs = max_session_slots;
7156
7157         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7158                 "max_ops=%u max_reqs=%u\n",
7159                 __func__,
7160                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7161                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7162
7163         /* Back channel attributes */
7164         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7165         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7166         args->bc_attrs.max_resp_sz_cached = 0;
7167         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7168         args->bc_attrs.max_reqs = 1;
7169
7170         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7171                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7172                 __func__,
7173                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7174                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7175                 args->bc_attrs.max_reqs);
7176 }
7177
7178 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7179                 struct nfs41_create_session_res *res)
7180 {
7181         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7182         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7183
7184         if (rcvd->max_resp_sz > sent->max_resp_sz)
7185                 return -EINVAL;
7186         /*
7187          * Our requested max_ops is the minimum we need; we're not
7188          * prepared to break up compounds into smaller pieces than that.
7189          * So, no point even trying to continue if the server won't
7190          * cooperate:
7191          */
7192         if (rcvd->max_ops < sent->max_ops)
7193                 return -EINVAL;
7194         if (rcvd->max_reqs == 0)
7195                 return -EINVAL;
7196         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7197                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7198         return 0;
7199 }
7200
7201 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7202                 struct nfs41_create_session_res *res)
7203 {
7204         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7205         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7206
7207         if (!(res->flags & SESSION4_BACK_CHAN))
7208                 goto out;
7209         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7210                 return -EINVAL;
7211         if (rcvd->max_resp_sz < sent->max_resp_sz)
7212                 return -EINVAL;
7213         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7214                 return -EINVAL;
7215         /* These would render the backchannel useless: */
7216         if (rcvd->max_ops != sent->max_ops)
7217                 return -EINVAL;
7218         if (rcvd->max_reqs != sent->max_reqs)
7219                 return -EINVAL;
7220 out:
7221         return 0;
7222 }
7223
7224 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7225                                      struct nfs41_create_session_res *res)
7226 {
7227         int ret;
7228
7229         ret = nfs4_verify_fore_channel_attrs(args, res);
7230         if (ret)
7231                 return ret;
7232         return nfs4_verify_back_channel_attrs(args, res);
7233 }
7234
7235 static void nfs4_update_session(struct nfs4_session *session,
7236                 struct nfs41_create_session_res *res)
7237 {
7238         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7239         /* Mark client id and session as being confirmed */
7240         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7241         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7242         session->flags = res->flags;
7243         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7244         if (res->flags & SESSION4_BACK_CHAN)
7245                 memcpy(&session->bc_attrs, &res->bc_attrs,
7246                                 sizeof(session->bc_attrs));
7247 }
7248
7249 static int _nfs4_proc_create_session(struct nfs_client *clp,
7250                 struct rpc_cred *cred)
7251 {
7252         struct nfs4_session *session = clp->cl_session;
7253         struct nfs41_create_session_args args = {
7254                 .client = clp,
7255                 .clientid = clp->cl_clientid,
7256                 .seqid = clp->cl_seqid,
7257                 .cb_program = NFS4_CALLBACK,
7258         };
7259         struct nfs41_create_session_res res;
7260
7261         struct rpc_message msg = {
7262                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7263                 .rpc_argp = &args,
7264                 .rpc_resp = &res,
7265                 .rpc_cred = cred,
7266         };
7267         int status;
7268
7269         nfs4_init_channel_attrs(&args);
7270         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7271
7272         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7273         trace_nfs4_create_session(clp, status);
7274
7275         if (!status) {
7276                 /* Verify the session's negotiated channel_attrs values */
7277                 status = nfs4_verify_channel_attrs(&args, &res);
7278                 /* Increment the clientid slot sequence id */
7279                 if (clp->cl_seqid == res.seqid)
7280                         clp->cl_seqid++;
7281                 if (status)
7282                         goto out;
7283                 nfs4_update_session(session, &res);
7284         }
7285 out:
7286         return status;
7287 }
7288
7289 /*
7290  * Issues a CREATE_SESSION operation to the server.
7291  * It is the responsibility of the caller to verify the session is
7292  * expired before calling this routine.
7293  */
7294 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7295 {
7296         int status;
7297         unsigned *ptr;
7298         struct nfs4_session *session = clp->cl_session;
7299
7300         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7301
7302         status = _nfs4_proc_create_session(clp, cred);
7303         if (status)
7304                 goto out;
7305
7306         /* Init or reset the session slot tables */
7307         status = nfs4_setup_session_slot_tables(session);
7308         dprintk("slot table setup returned %d\n", status);
7309         if (status)
7310                 goto out;
7311
7312         ptr = (unsigned *)&session->sess_id.data[0];
7313         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7314                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7315 out:
7316         dprintk("<-- %s\n", __func__);
7317         return status;
7318 }
7319
7320 /*
7321  * Issue the over-the-wire RPC DESTROY_SESSION.
7322  * The caller must serialize access to this routine.
7323  */
7324 int nfs4_proc_destroy_session(struct nfs4_session *session,
7325                 struct rpc_cred *cred)
7326 {
7327         struct rpc_message msg = {
7328                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7329                 .rpc_argp = session,
7330                 .rpc_cred = cred,
7331         };
7332         int status = 0;
7333
7334         dprintk("--> nfs4_proc_destroy_session\n");
7335
7336         /* session is still being setup */
7337         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7338                 return 0;
7339
7340         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7341         trace_nfs4_destroy_session(session->clp, status);
7342
7343         if (status)
7344                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7345                         "Session has been destroyed regardless...\n", status);
7346
7347         dprintk("<-- nfs4_proc_destroy_session\n");
7348         return status;
7349 }
7350
7351 /*
7352  * Renew the cl_session lease.
7353  */
7354 struct nfs4_sequence_data {
7355         struct nfs_client *clp;
7356         struct nfs4_sequence_args args;
7357         struct nfs4_sequence_res res;
7358 };
7359
7360 static void nfs41_sequence_release(void *data)
7361 {
7362         struct nfs4_sequence_data *calldata = data;
7363         struct nfs_client *clp = calldata->clp;
7364
7365         if (atomic_read(&clp->cl_count) > 1)
7366                 nfs4_schedule_state_renewal(clp);
7367         nfs_put_client(clp);
7368         kfree(calldata);
7369 }
7370
7371 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7372 {
7373         switch(task->tk_status) {
7374         case -NFS4ERR_DELAY:
7375                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7376                 return -EAGAIN;
7377         default:
7378                 nfs4_schedule_lease_recovery(clp);
7379         }
7380         return 0;
7381 }
7382
7383 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7384 {
7385         struct nfs4_sequence_data *calldata = data;
7386         struct nfs_client *clp = calldata->clp;
7387
7388         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7389                 return;
7390
7391         trace_nfs4_sequence(clp, task->tk_status);
7392         if (task->tk_status < 0) {
7393                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7394                 if (atomic_read(&clp->cl_count) == 1)
7395                         goto out;
7396
7397                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7398                         rpc_restart_call_prepare(task);
7399                         return;
7400                 }
7401         }
7402         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7403 out:
7404         dprintk("<-- %s\n", __func__);
7405 }
7406
7407 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7408 {
7409         struct nfs4_sequence_data *calldata = data;
7410         struct nfs_client *clp = calldata->clp;
7411         struct nfs4_sequence_args *args;
7412         struct nfs4_sequence_res *res;
7413
7414         args = task->tk_msg.rpc_argp;
7415         res = task->tk_msg.rpc_resp;
7416
7417         nfs41_setup_sequence(clp->cl_session, args, res, task);
7418 }
7419
7420 static const struct rpc_call_ops nfs41_sequence_ops = {
7421         .rpc_call_done = nfs41_sequence_call_done,
7422         .rpc_call_prepare = nfs41_sequence_prepare,
7423         .rpc_release = nfs41_sequence_release,
7424 };
7425
7426 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7427                 struct rpc_cred *cred,
7428                 bool is_privileged)
7429 {
7430         struct nfs4_sequence_data *calldata;
7431         struct rpc_message msg = {
7432                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7433                 .rpc_cred = cred,
7434         };
7435         struct rpc_task_setup task_setup_data = {
7436                 .rpc_client = clp->cl_rpcclient,
7437                 .rpc_message = &msg,
7438                 .callback_ops = &nfs41_sequence_ops,
7439                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7440         };
7441
7442         if (!atomic_inc_not_zero(&clp->cl_count))
7443                 return ERR_PTR(-EIO);
7444         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7445         if (calldata == NULL) {
7446                 nfs_put_client(clp);
7447                 return ERR_PTR(-ENOMEM);
7448         }
7449         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7450         if (is_privileged)
7451                 nfs4_set_sequence_privileged(&calldata->args);
7452         msg.rpc_argp = &calldata->args;
7453         msg.rpc_resp = &calldata->res;
7454         calldata->clp = clp;
7455         task_setup_data.callback_data = calldata;
7456
7457         return rpc_run_task(&task_setup_data);
7458 }
7459
7460 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7461 {
7462         struct rpc_task *task;
7463         int ret = 0;
7464
7465         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7466                 return -EAGAIN;
7467         task = _nfs41_proc_sequence(clp, cred, false);
7468         if (IS_ERR(task))
7469                 ret = PTR_ERR(task);
7470         else
7471                 rpc_put_task_async(task);
7472         dprintk("<-- %s status=%d\n", __func__, ret);
7473         return ret;
7474 }
7475
7476 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7477 {
7478         struct rpc_task *task;
7479         int ret;
7480
7481         task = _nfs41_proc_sequence(clp, cred, true);
7482         if (IS_ERR(task)) {
7483                 ret = PTR_ERR(task);
7484                 goto out;
7485         }
7486         ret = rpc_wait_for_completion_task(task);
7487         if (!ret) {
7488                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7489
7490                 if (task->tk_status == 0)
7491                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7492                 ret = task->tk_status;
7493         }
7494         rpc_put_task(task);
7495 out:
7496         dprintk("<-- %s status=%d\n", __func__, ret);
7497         return ret;
7498 }
7499
7500 struct nfs4_reclaim_complete_data {
7501         struct nfs_client *clp;
7502         struct nfs41_reclaim_complete_args arg;
7503         struct nfs41_reclaim_complete_res res;
7504 };
7505
7506 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7507 {
7508         struct nfs4_reclaim_complete_data *calldata = data;
7509
7510         nfs41_setup_sequence(calldata->clp->cl_session,
7511                         &calldata->arg.seq_args,
7512                         &calldata->res.seq_res,
7513                         task);
7514 }
7515
7516 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7517 {
7518         switch(task->tk_status) {
7519         case 0:
7520         case -NFS4ERR_COMPLETE_ALREADY:
7521         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7522                 break;
7523         case -NFS4ERR_DELAY:
7524                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7525                 /* fall through */
7526         case -NFS4ERR_RETRY_UNCACHED_REP:
7527                 return -EAGAIN;
7528         default:
7529                 nfs4_schedule_lease_recovery(clp);
7530         }
7531         return 0;
7532 }
7533
7534 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7535 {
7536         struct nfs4_reclaim_complete_data *calldata = data;
7537         struct nfs_client *clp = calldata->clp;
7538         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7539
7540         dprintk("--> %s\n", __func__);
7541         if (!nfs41_sequence_done(task, res))
7542                 return;
7543
7544         trace_nfs4_reclaim_complete(clp, task->tk_status);
7545         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7546                 rpc_restart_call_prepare(task);
7547                 return;
7548         }
7549         dprintk("<-- %s\n", __func__);
7550 }
7551
7552 static void nfs4_free_reclaim_complete_data(void *data)
7553 {
7554         struct nfs4_reclaim_complete_data *calldata = data;
7555
7556         kfree(calldata);
7557 }
7558
7559 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7560         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7561         .rpc_call_done = nfs4_reclaim_complete_done,
7562         .rpc_release = nfs4_free_reclaim_complete_data,
7563 };
7564
7565 /*
7566  * Issue a global reclaim complete.
7567  */
7568 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7569                 struct rpc_cred *cred)
7570 {
7571         struct nfs4_reclaim_complete_data *calldata;
7572         struct rpc_task *task;
7573         struct rpc_message msg = {
7574                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7575                 .rpc_cred = cred,
7576         };
7577         struct rpc_task_setup task_setup_data = {
7578                 .rpc_client = clp->cl_rpcclient,
7579                 .rpc_message = &msg,
7580                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7581                 .flags = RPC_TASK_ASYNC,
7582         };
7583         int status = -ENOMEM;
7584
7585         dprintk("--> %s\n", __func__);
7586         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7587         if (calldata == NULL)
7588                 goto out;
7589         calldata->clp = clp;
7590         calldata->arg.one_fs = 0;
7591
7592         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7593         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7594         msg.rpc_argp = &calldata->arg;
7595         msg.rpc_resp = &calldata->res;
7596         task_setup_data.callback_data = calldata;
7597         task = rpc_run_task(&task_setup_data);
7598         if (IS_ERR(task)) {
7599                 status = PTR_ERR(task);
7600                 goto out;
7601         }
7602         status = nfs4_wait_for_completion_rpc_task(task);
7603         if (status == 0)
7604                 status = task->tk_status;
7605         rpc_put_task(task);
7606         return 0;
7607 out:
7608         dprintk("<-- %s status=%d\n", __func__, status);
7609         return status;
7610 }
7611
7612 static void
7613 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7614 {
7615         struct nfs4_layoutget *lgp = calldata;
7616         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7617         struct nfs4_session *session = nfs4_get_session(server);
7618
7619         dprintk("--> %s\n", __func__);
7620         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7621          * right now covering the LAYOUTGET we are about to send.
7622          * However, that is not so catastrophic, and there seems
7623          * to be no way to prevent it completely.
7624          */
7625         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7626                                 &lgp->res.seq_res, task))
7627                 return;
7628         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7629                                           NFS_I(lgp->args.inode)->layout,
7630                                           &lgp->args.range,
7631                                           lgp->args.ctx->state)) {
7632                 rpc_exit(task, NFS4_OK);
7633         }
7634 }
7635
7636 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7637 {
7638         struct nfs4_layoutget *lgp = calldata;
7639         struct inode *inode = lgp->args.inode;
7640         struct nfs_server *server = NFS_SERVER(inode);
7641         struct pnfs_layout_hdr *lo;
7642         struct nfs4_state *state = NULL;
7643         unsigned long timeo, now, giveup;
7644
7645         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7646
7647         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7648                 goto out;
7649
7650         switch (task->tk_status) {
7651         case 0:
7652                 goto out;
7653         /*
7654          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7655          * (or clients) writing to the same RAID stripe
7656          */
7657         case -NFS4ERR_LAYOUTTRYLATER:
7658         /*
7659          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7660          * existing layout before getting a new one).
7661          */
7662         case -NFS4ERR_RECALLCONFLICT:
7663                 timeo = rpc_get_timeout(task->tk_client);
7664                 giveup = lgp->args.timestamp + timeo;
7665                 now = jiffies;
7666                 if (time_after(giveup, now)) {
7667                         unsigned long delay;
7668
7669                         /* Delay for:
7670                          * - Not less then NFS4_POLL_RETRY_MIN.
7671                          * - One last time a jiffie before we give up
7672                          * - exponential backoff (time_now minus start_attempt)
7673                          */
7674                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7675                                     min((giveup - now - 1),
7676                                         now - lgp->args.timestamp));
7677
7678                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7679                                 __func__, delay);
7680                         rpc_delay(task, delay);
7681                         task->tk_status = 0;
7682                         rpc_restart_call_prepare(task);
7683                         goto out; /* Do not call nfs4_async_handle_error() */
7684                 }
7685                 break;
7686         case -NFS4ERR_EXPIRED:
7687         case -NFS4ERR_BAD_STATEID:
7688                 spin_lock(&inode->i_lock);
7689                 lo = NFS_I(inode)->layout;
7690                 if (!lo || list_empty(&lo->plh_segs)) {
7691                         spin_unlock(&inode->i_lock);
7692                         /* If the open stateid was bad, then recover it. */
7693                         state = lgp->args.ctx->state;
7694                 } else {
7695                         LIST_HEAD(head);
7696
7697                         /*
7698                          * Mark the bad layout state as invalid, then retry
7699                          * with the current stateid.
7700                          */
7701                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7702                         spin_unlock(&inode->i_lock);
7703                         pnfs_free_lseg_list(&head);
7704
7705                         task->tk_status = 0;
7706                         rpc_restart_call_prepare(task);
7707                 }
7708         }
7709         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7710                 rpc_restart_call_prepare(task);
7711 out:
7712         dprintk("<-- %s\n", __func__);
7713 }
7714
7715 static size_t max_response_pages(struct nfs_server *server)
7716 {
7717         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7718         return nfs_page_array_len(0, max_resp_sz);
7719 }
7720
7721 static void nfs4_free_pages(struct page **pages, size_t size)
7722 {
7723         int i;
7724
7725         if (!pages)
7726                 return;
7727
7728         for (i = 0; i < size; i++) {
7729                 if (!pages[i])
7730                         break;
7731                 __free_page(pages[i]);
7732         }
7733         kfree(pages);
7734 }
7735
7736 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7737 {
7738         struct page **pages;
7739         int i;
7740
7741         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7742         if (!pages) {
7743                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7744                 return NULL;
7745         }
7746
7747         for (i = 0; i < size; i++) {
7748                 pages[i] = alloc_page(gfp_flags);
7749                 if (!pages[i]) {
7750                         dprintk("%s: failed to allocate page\n", __func__);
7751                         nfs4_free_pages(pages, size);
7752                         return NULL;
7753                 }
7754         }
7755
7756         return pages;
7757 }
7758
7759 static void nfs4_layoutget_release(void *calldata)
7760 {
7761         struct nfs4_layoutget *lgp = calldata;
7762         struct inode *inode = lgp->args.inode;
7763         struct nfs_server *server = NFS_SERVER(inode);
7764         size_t max_pages = max_response_pages(server);
7765
7766         dprintk("--> %s\n", __func__);
7767         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7768         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7769         put_nfs_open_context(lgp->args.ctx);
7770         kfree(calldata);
7771         dprintk("<-- %s\n", __func__);
7772 }
7773
7774 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7775         .rpc_call_prepare = nfs4_layoutget_prepare,
7776         .rpc_call_done = nfs4_layoutget_done,
7777         .rpc_release = nfs4_layoutget_release,
7778 };
7779
7780 struct pnfs_layout_segment *
7781 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7782 {
7783         struct inode *inode = lgp->args.inode;
7784         struct nfs_server *server = NFS_SERVER(inode);
7785         size_t max_pages = max_response_pages(server);
7786         struct rpc_task *task;
7787         struct rpc_message msg = {
7788                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7789                 .rpc_argp = &lgp->args,
7790                 .rpc_resp = &lgp->res,
7791                 .rpc_cred = lgp->cred,
7792         };
7793         struct rpc_task_setup task_setup_data = {
7794                 .rpc_client = server->client,
7795                 .rpc_message = &msg,
7796                 .callback_ops = &nfs4_layoutget_call_ops,
7797                 .callback_data = lgp,
7798                 .flags = RPC_TASK_ASYNC,
7799         };
7800         struct pnfs_layout_segment *lseg = NULL;
7801         int status = 0;
7802
7803         dprintk("--> %s\n", __func__);
7804
7805         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7806         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7807
7808         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7809         if (!lgp->args.layout.pages) {
7810                 nfs4_layoutget_release(lgp);
7811                 return ERR_PTR(-ENOMEM);
7812         }
7813         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7814         lgp->args.timestamp = jiffies;
7815
7816         lgp->res.layoutp = &lgp->args.layout;
7817         lgp->res.seq_res.sr_slot = NULL;
7818         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7819
7820         task = rpc_run_task(&task_setup_data);
7821         if (IS_ERR(task))
7822                 return ERR_CAST(task);
7823         status = nfs4_wait_for_completion_rpc_task(task);
7824         if (status == 0)
7825                 status = task->tk_status;
7826         trace_nfs4_layoutget(lgp->args.ctx,
7827                         &lgp->args.range,
7828                         &lgp->res.range,
7829                         status);
7830         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7831         if (status == 0 && lgp->res.layoutp->len)
7832                 lseg = pnfs_layout_process(lgp);
7833         rpc_put_task(task);
7834         dprintk("<-- %s status=%d\n", __func__, status);
7835         if (status)
7836                 return ERR_PTR(status);
7837         return lseg;
7838 }
7839
7840 static void
7841 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7842 {
7843         struct nfs4_layoutreturn *lrp = calldata;
7844
7845         dprintk("--> %s\n", __func__);
7846         nfs41_setup_sequence(lrp->clp->cl_session,
7847                         &lrp->args.seq_args,
7848                         &lrp->res.seq_res,
7849                         task);
7850 }
7851
7852 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7853 {
7854         struct nfs4_layoutreturn *lrp = calldata;
7855         struct nfs_server *server;
7856
7857         dprintk("--> %s\n", __func__);
7858
7859         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7860                 return;
7861
7862         server = NFS_SERVER(lrp->args.inode);
7863         switch (task->tk_status) {
7864         default:
7865                 task->tk_status = 0;
7866         case 0:
7867                 break;
7868         case -NFS4ERR_DELAY:
7869                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7870                         break;
7871                 rpc_restart_call_prepare(task);
7872                 return;
7873         }
7874         dprintk("<-- %s\n", __func__);
7875 }
7876
7877 static void nfs4_layoutreturn_release(void *calldata)
7878 {
7879         struct nfs4_layoutreturn *lrp = calldata;
7880         struct pnfs_layout_hdr *lo = lrp->args.layout;
7881
7882         dprintk("--> %s\n", __func__);
7883         spin_lock(&lo->plh_inode->i_lock);
7884         if (lrp->res.lrs_present)
7885                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7886         pnfs_clear_layoutreturn_waitbit(lo);
7887         clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
7888         rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
7889         lo->plh_block_lgets--;
7890         spin_unlock(&lo->plh_inode->i_lock);
7891         pnfs_put_layout_hdr(lrp->args.layout);
7892         nfs_iput_and_deactive(lrp->inode);
7893         kfree(calldata);
7894         dprintk("<-- %s\n", __func__);
7895 }
7896
7897 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7898         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7899         .rpc_call_done = nfs4_layoutreturn_done,
7900         .rpc_release = nfs4_layoutreturn_release,
7901 };
7902
7903 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
7904 {
7905         struct rpc_task *task;
7906         struct rpc_message msg = {
7907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7908                 .rpc_argp = &lrp->args,
7909                 .rpc_resp = &lrp->res,
7910                 .rpc_cred = lrp->cred,
7911         };
7912         struct rpc_task_setup task_setup_data = {
7913                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7914                 .rpc_message = &msg,
7915                 .callback_ops = &nfs4_layoutreturn_call_ops,
7916                 .callback_data = lrp,
7917         };
7918         int status = 0;
7919
7920         dprintk("--> %s\n", __func__);
7921         if (!sync) {
7922                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
7923                 if (!lrp->inode) {
7924                         nfs4_layoutreturn_release(lrp);
7925                         return -EAGAIN;
7926                 }
7927                 task_setup_data.flags |= RPC_TASK_ASYNC;
7928         }
7929         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7930         task = rpc_run_task(&task_setup_data);
7931         if (IS_ERR(task))
7932                 return PTR_ERR(task);
7933         if (sync)
7934                 status = task->tk_status;
7935         trace_nfs4_layoutreturn(lrp->args.inode, status);
7936         dprintk("<-- %s status=%d\n", __func__, status);
7937         rpc_put_task(task);
7938         return status;
7939 }
7940
7941 static int
7942 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7943                 struct pnfs_device *pdev,
7944                 struct rpc_cred *cred)
7945 {
7946         struct nfs4_getdeviceinfo_args args = {
7947                 .pdev = pdev,
7948                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
7949                         NOTIFY_DEVICEID4_DELETE,
7950         };
7951         struct nfs4_getdeviceinfo_res res = {
7952                 .pdev = pdev,
7953         };
7954         struct rpc_message msg = {
7955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7956                 .rpc_argp = &args,
7957                 .rpc_resp = &res,
7958                 .rpc_cred = cred,
7959         };
7960         int status;
7961
7962         dprintk("--> %s\n", __func__);
7963         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7964         if (res.notification & ~args.notify_types)
7965                 dprintk("%s: unsupported notification\n", __func__);
7966         if (res.notification != args.notify_types)
7967                 pdev->nocache = 1;
7968
7969         dprintk("<-- %s status=%d\n", __func__, status);
7970
7971         return status;
7972 }
7973
7974 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7975                 struct pnfs_device *pdev,
7976                 struct rpc_cred *cred)
7977 {
7978         struct nfs4_exception exception = { };
7979         int err;
7980
7981         do {
7982                 err = nfs4_handle_exception(server,
7983                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7984                                         &exception);
7985         } while (exception.retry);
7986         return err;
7987 }
7988 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7989
7990 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7991 {
7992         struct nfs4_layoutcommit_data *data = calldata;
7993         struct nfs_server *server = NFS_SERVER(data->args.inode);
7994         struct nfs4_session *session = nfs4_get_session(server);
7995
7996         nfs41_setup_sequence(session,
7997                         &data->args.seq_args,
7998                         &data->res.seq_res,
7999                         task);
8000 }
8001
8002 static void
8003 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8004 {
8005         struct nfs4_layoutcommit_data *data = calldata;
8006         struct nfs_server *server = NFS_SERVER(data->args.inode);
8007
8008         if (!nfs41_sequence_done(task, &data->res.seq_res))
8009                 return;
8010
8011         switch (task->tk_status) { /* Just ignore these failures */
8012         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8013         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8014         case -NFS4ERR_BADLAYOUT:     /* no layout */
8015         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8016                 task->tk_status = 0;
8017         case 0:
8018                 break;
8019         default:
8020                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8021                         rpc_restart_call_prepare(task);
8022                         return;
8023                 }
8024         }
8025 }
8026
8027 static void nfs4_layoutcommit_release(void *calldata)
8028 {
8029         struct nfs4_layoutcommit_data *data = calldata;
8030
8031         pnfs_cleanup_layoutcommit(data);
8032         nfs_post_op_update_inode_force_wcc(data->args.inode,
8033                                            data->res.fattr);
8034         put_rpccred(data->cred);
8035         nfs_iput_and_deactive(data->inode);
8036         kfree(data);
8037 }
8038
8039 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8040         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8041         .rpc_call_done = nfs4_layoutcommit_done,
8042         .rpc_release = nfs4_layoutcommit_release,
8043 };
8044
8045 int
8046 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8047 {
8048         struct rpc_message msg = {
8049                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8050                 .rpc_argp = &data->args,
8051                 .rpc_resp = &data->res,
8052                 .rpc_cred = data->cred,
8053         };
8054         struct rpc_task_setup task_setup_data = {
8055                 .task = &data->task,
8056                 .rpc_client = NFS_CLIENT(data->args.inode),
8057                 .rpc_message = &msg,
8058                 .callback_ops = &nfs4_layoutcommit_ops,
8059                 .callback_data = data,
8060         };
8061         struct rpc_task *task;
8062         int status = 0;
8063
8064         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
8065                 "lbw: %llu inode %lu\n",
8066                 data->task.tk_pid, sync,
8067                 data->args.lastbytewritten,
8068                 data->args.inode->i_ino);
8069
8070         if (!sync) {
8071                 data->inode = nfs_igrab_and_active(data->args.inode);
8072                 if (data->inode == NULL) {
8073                         nfs4_layoutcommit_release(data);
8074                         return -EAGAIN;
8075                 }
8076                 task_setup_data.flags = RPC_TASK_ASYNC;
8077         }
8078         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8079         task = rpc_run_task(&task_setup_data);
8080         if (IS_ERR(task))
8081                 return PTR_ERR(task);
8082         if (sync)
8083                 status = task->tk_status;
8084         trace_nfs4_layoutcommit(data->args.inode, status);
8085         dprintk("%s: status %d\n", __func__, status);
8086         rpc_put_task(task);
8087         return status;
8088 }
8089
8090 /**
8091  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8092  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8093  */
8094 static int
8095 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8096                     struct nfs_fsinfo *info,
8097                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8098 {
8099         struct nfs41_secinfo_no_name_args args = {
8100                 .style = SECINFO_STYLE_CURRENT_FH,
8101         };
8102         struct nfs4_secinfo_res res = {
8103                 .flavors = flavors,
8104         };
8105         struct rpc_message msg = {
8106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8107                 .rpc_argp = &args,
8108                 .rpc_resp = &res,
8109         };
8110         struct rpc_clnt *clnt = server->client;
8111         struct rpc_cred *cred = NULL;
8112         int status;
8113
8114         if (use_integrity) {
8115                 clnt = server->nfs_client->cl_rpcclient;
8116                 cred = nfs4_get_clid_cred(server->nfs_client);
8117                 msg.rpc_cred = cred;
8118         }
8119
8120         dprintk("--> %s\n", __func__);
8121         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8122                                 &res.seq_res, 0);
8123         dprintk("<-- %s status=%d\n", __func__, status);
8124
8125         if (cred)
8126                 put_rpccred(cred);
8127
8128         return status;
8129 }
8130
8131 static int
8132 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8133                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8134 {
8135         struct nfs4_exception exception = { };
8136         int err;
8137         do {
8138                 /* first try using integrity protection */
8139                 err = -NFS4ERR_WRONGSEC;
8140
8141                 /* try to use integrity protection with machine cred */
8142                 if (_nfs4_is_integrity_protected(server->nfs_client))
8143                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8144                                                           flavors, true);
8145
8146                 /*
8147                  * if unable to use integrity protection, or SECINFO with
8148                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8149                  * disallowed by spec, but exists in deployed servers) use
8150                  * the current filesystem's rpc_client and the user cred.
8151                  */
8152                 if (err == -NFS4ERR_WRONGSEC)
8153                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8154                                                           flavors, false);
8155
8156                 switch (err) {
8157                 case 0:
8158                 case -NFS4ERR_WRONGSEC:
8159                 case -ENOTSUPP:
8160                         goto out;
8161                 default:
8162                         err = nfs4_handle_exception(server, err, &exception);
8163                 }
8164         } while (exception.retry);
8165 out:
8166         return err;
8167 }
8168
8169 static int
8170 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8171                     struct nfs_fsinfo *info)
8172 {
8173         int err;
8174         struct page *page;
8175         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8176         struct nfs4_secinfo_flavors *flavors;
8177         struct nfs4_secinfo4 *secinfo;
8178         int i;
8179
8180         page = alloc_page(GFP_KERNEL);
8181         if (!page) {
8182                 err = -ENOMEM;
8183                 goto out;
8184         }
8185
8186         flavors = page_address(page);
8187         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8188
8189         /*
8190          * Fall back on "guess and check" method if
8191          * the server doesn't support SECINFO_NO_NAME
8192          */
8193         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8194                 err = nfs4_find_root_sec(server, fhandle, info);
8195                 goto out_freepage;
8196         }
8197         if (err)
8198                 goto out_freepage;
8199
8200         for (i = 0; i < flavors->num_flavors; i++) {
8201                 secinfo = &flavors->flavors[i];
8202
8203                 switch (secinfo->flavor) {
8204                 case RPC_AUTH_NULL:
8205                 case RPC_AUTH_UNIX:
8206                 case RPC_AUTH_GSS:
8207                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8208                                         &secinfo->flavor_info);
8209                         break;
8210                 default:
8211                         flavor = RPC_AUTH_MAXFLAVOR;
8212                         break;
8213                 }
8214
8215                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8216                         flavor = RPC_AUTH_MAXFLAVOR;
8217
8218                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8219                         err = nfs4_lookup_root_sec(server, fhandle,
8220                                                    info, flavor);
8221                         if (!err)
8222                                 break;
8223                 }
8224         }
8225
8226         if (flavor == RPC_AUTH_MAXFLAVOR)
8227                 err = -EPERM;
8228
8229 out_freepage:
8230         put_page(page);
8231         if (err == -EACCES)
8232                 return -EPERM;
8233 out:
8234         return err;
8235 }
8236
8237 static int _nfs41_test_stateid(struct nfs_server *server,
8238                 nfs4_stateid *stateid,
8239                 struct rpc_cred *cred)
8240 {
8241         int status;
8242         struct nfs41_test_stateid_args args = {
8243                 .stateid = stateid,
8244         };
8245         struct nfs41_test_stateid_res res;
8246         struct rpc_message msg = {
8247                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8248                 .rpc_argp = &args,
8249                 .rpc_resp = &res,
8250                 .rpc_cred = cred,
8251         };
8252         struct rpc_clnt *rpc_client = server->client;
8253
8254         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8255                 &rpc_client, &msg);
8256
8257         dprintk("NFS call  test_stateid %p\n", stateid);
8258         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8259         nfs4_set_sequence_privileged(&args.seq_args);
8260         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8261                         &args.seq_args, &res.seq_res);
8262         if (status != NFS_OK) {
8263                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8264                 return status;
8265         }
8266         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8267         return -res.status;
8268 }
8269
8270 /**
8271  * nfs41_test_stateid - perform a TEST_STATEID operation
8272  *
8273  * @server: server / transport on which to perform the operation
8274  * @stateid: state ID to test
8275  * @cred: credential
8276  *
8277  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8278  * Otherwise a negative NFS4ERR value is returned if the operation
8279  * failed or the state ID is not currently valid.
8280  */
8281 static int nfs41_test_stateid(struct nfs_server *server,
8282                 nfs4_stateid *stateid,
8283                 struct rpc_cred *cred)
8284 {
8285         struct nfs4_exception exception = { };
8286         int err;
8287         do {
8288                 err = _nfs41_test_stateid(server, stateid, cred);
8289                 if (err != -NFS4ERR_DELAY)
8290                         break;
8291                 nfs4_handle_exception(server, err, &exception);
8292         } while (exception.retry);
8293         return err;
8294 }
8295
8296 struct nfs_free_stateid_data {
8297         struct nfs_server *server;
8298         struct nfs41_free_stateid_args args;
8299         struct nfs41_free_stateid_res res;
8300 };
8301
8302 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8303 {
8304         struct nfs_free_stateid_data *data = calldata;
8305         nfs41_setup_sequence(nfs4_get_session(data->server),
8306                         &data->args.seq_args,
8307                         &data->res.seq_res,
8308                         task);
8309 }
8310
8311 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8312 {
8313         struct nfs_free_stateid_data *data = calldata;
8314
8315         nfs41_sequence_done(task, &data->res.seq_res);
8316
8317         switch (task->tk_status) {
8318         case -NFS4ERR_DELAY:
8319                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8320                         rpc_restart_call_prepare(task);
8321         }
8322 }
8323
8324 static void nfs41_free_stateid_release(void *calldata)
8325 {
8326         kfree(calldata);
8327 }
8328
8329 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8330         .rpc_call_prepare = nfs41_free_stateid_prepare,
8331         .rpc_call_done = nfs41_free_stateid_done,
8332         .rpc_release = nfs41_free_stateid_release,
8333 };
8334
8335 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8336                 nfs4_stateid *stateid,
8337                 struct rpc_cred *cred,
8338                 bool privileged)
8339 {
8340         struct rpc_message msg = {
8341                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8342                 .rpc_cred = cred,
8343         };
8344         struct rpc_task_setup task_setup = {
8345                 .rpc_client = server->client,
8346                 .rpc_message = &msg,
8347                 .callback_ops = &nfs41_free_stateid_ops,
8348                 .flags = RPC_TASK_ASYNC,
8349         };
8350         struct nfs_free_stateid_data *data;
8351
8352         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8353                 &task_setup.rpc_client, &msg);
8354
8355         dprintk("NFS call  free_stateid %p\n", stateid);
8356         data = kmalloc(sizeof(*data), GFP_NOFS);
8357         if (!data)
8358                 return ERR_PTR(-ENOMEM);
8359         data->server = server;
8360         nfs4_stateid_copy(&data->args.stateid, stateid);
8361
8362         task_setup.callback_data = data;
8363
8364         msg.rpc_argp = &data->args;
8365         msg.rpc_resp = &data->res;
8366         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8367         if (privileged)
8368                 nfs4_set_sequence_privileged(&data->args.seq_args);
8369
8370         return rpc_run_task(&task_setup);
8371 }
8372
8373 /**
8374  * nfs41_free_stateid - perform a FREE_STATEID operation
8375  *
8376  * @server: server / transport on which to perform the operation
8377  * @stateid: state ID to release
8378  * @cred: credential
8379  *
8380  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8381  * negative NFS4ERR value is returned.
8382  */
8383 static int nfs41_free_stateid(struct nfs_server *server,
8384                 nfs4_stateid *stateid,
8385                 struct rpc_cred *cred)
8386 {
8387         struct rpc_task *task;
8388         int ret;
8389
8390         task = _nfs41_free_stateid(server, stateid, cred, true);
8391         if (IS_ERR(task))
8392                 return PTR_ERR(task);
8393         ret = rpc_wait_for_completion_task(task);
8394         if (!ret)
8395                 ret = task->tk_status;
8396         rpc_put_task(task);
8397         return ret;
8398 }
8399
8400 static void
8401 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8402 {
8403         struct rpc_task *task;
8404         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8405
8406         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8407         nfs4_free_lock_state(server, lsp);
8408         if (IS_ERR(task))
8409                 return;
8410         rpc_put_task(task);
8411 }
8412
8413 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8414                 const nfs4_stateid *s2)
8415 {
8416         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8417                 return false;
8418
8419         if (s1->seqid == s2->seqid)
8420                 return true;
8421         if (s1->seqid == 0 || s2->seqid == 0)
8422                 return true;
8423
8424         return false;
8425 }
8426
8427 #endif /* CONFIG_NFS_V4_1 */
8428
8429 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8430                 const nfs4_stateid *s2)
8431 {
8432         return nfs4_stateid_match(s1, s2);
8433 }
8434
8435
8436 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8437         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8438         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8439         .recover_open   = nfs4_open_reclaim,
8440         .recover_lock   = nfs4_lock_reclaim,
8441         .establish_clid = nfs4_init_clientid,
8442         .detect_trunking = nfs40_discover_server_trunking,
8443 };
8444
8445 #if defined(CONFIG_NFS_V4_1)
8446 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8447         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8448         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8449         .recover_open   = nfs4_open_reclaim,
8450         .recover_lock   = nfs4_lock_reclaim,
8451         .establish_clid = nfs41_init_clientid,
8452         .reclaim_complete = nfs41_proc_reclaim_complete,
8453         .detect_trunking = nfs41_discover_server_trunking,
8454 };
8455 #endif /* CONFIG_NFS_V4_1 */
8456
8457 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8458         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8459         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8460         .recover_open   = nfs40_open_expired,
8461         .recover_lock   = nfs4_lock_expired,
8462         .establish_clid = nfs4_init_clientid,
8463 };
8464
8465 #if defined(CONFIG_NFS_V4_1)
8466 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8467         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8468         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8469         .recover_open   = nfs41_open_expired,
8470         .recover_lock   = nfs41_lock_expired,
8471         .establish_clid = nfs41_init_clientid,
8472 };
8473 #endif /* CONFIG_NFS_V4_1 */
8474
8475 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8476         .sched_state_renewal = nfs4_proc_async_renew,
8477         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8478         .renew_lease = nfs4_proc_renew,
8479 };
8480
8481 #if defined(CONFIG_NFS_V4_1)
8482 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8483         .sched_state_renewal = nfs41_proc_async_sequence,
8484         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8485         .renew_lease = nfs4_proc_sequence,
8486 };
8487 #endif
8488
8489 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8490         .get_locations = _nfs40_proc_get_locations,
8491         .fsid_present = _nfs40_proc_fsid_present,
8492 };
8493
8494 #if defined(CONFIG_NFS_V4_1)
8495 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8496         .get_locations = _nfs41_proc_get_locations,
8497         .fsid_present = _nfs41_proc_fsid_present,
8498 };
8499 #endif  /* CONFIG_NFS_V4_1 */
8500
8501 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8502         .minor_version = 0,
8503         .init_caps = NFS_CAP_READDIRPLUS
8504                 | NFS_CAP_ATOMIC_OPEN
8505                 | NFS_CAP_CHANGE_ATTR
8506                 | NFS_CAP_POSIX_LOCK,
8507         .init_client = nfs40_init_client,
8508         .shutdown_client = nfs40_shutdown_client,
8509         .match_stateid = nfs4_match_stateid,
8510         .find_root_sec = nfs4_find_root_sec,
8511         .free_lock_state = nfs4_release_lockowner,
8512         .alloc_seqid = nfs_alloc_seqid,
8513         .call_sync_ops = &nfs40_call_sync_ops,
8514         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8515         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8516         .state_renewal_ops = &nfs40_state_renewal_ops,
8517         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8518 };
8519
8520 #if defined(CONFIG_NFS_V4_1)
8521 static struct nfs_seqid *
8522 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8523 {
8524         return NULL;
8525 }
8526
8527 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8528         .minor_version = 1,
8529         .init_caps = NFS_CAP_READDIRPLUS
8530                 | NFS_CAP_ATOMIC_OPEN
8531                 | NFS_CAP_CHANGE_ATTR
8532                 | NFS_CAP_POSIX_LOCK
8533                 | NFS_CAP_STATEID_NFSV41
8534                 | NFS_CAP_ATOMIC_OPEN_V1,
8535         .init_client = nfs41_init_client,
8536         .shutdown_client = nfs41_shutdown_client,
8537         .match_stateid = nfs41_match_stateid,
8538         .find_root_sec = nfs41_find_root_sec,
8539         .free_lock_state = nfs41_free_lock_state,
8540         .alloc_seqid = nfs_alloc_no_seqid,
8541         .call_sync_ops = &nfs41_call_sync_ops,
8542         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8543         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8544         .state_renewal_ops = &nfs41_state_renewal_ops,
8545         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8546 };
8547 #endif
8548
8549 #if defined(CONFIG_NFS_V4_2)
8550 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8551         .minor_version = 2,
8552         .init_caps = NFS_CAP_READDIRPLUS
8553                 | NFS_CAP_ATOMIC_OPEN
8554                 | NFS_CAP_CHANGE_ATTR
8555                 | NFS_CAP_POSIX_LOCK
8556                 | NFS_CAP_STATEID_NFSV41
8557                 | NFS_CAP_ATOMIC_OPEN_V1
8558                 | NFS_CAP_ALLOCATE
8559                 | NFS_CAP_DEALLOCATE
8560                 | NFS_CAP_SEEK,
8561         .init_client = nfs41_init_client,
8562         .shutdown_client = nfs41_shutdown_client,
8563         .match_stateid = nfs41_match_stateid,
8564         .find_root_sec = nfs41_find_root_sec,
8565         .free_lock_state = nfs41_free_lock_state,
8566         .call_sync_ops = &nfs41_call_sync_ops,
8567         .alloc_seqid = nfs_alloc_no_seqid,
8568         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8569         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8570         .state_renewal_ops = &nfs41_state_renewal_ops,
8571 };
8572 #endif
8573
8574 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8575         [0] = &nfs_v4_0_minor_ops,
8576 #if defined(CONFIG_NFS_V4_1)
8577         [1] = &nfs_v4_1_minor_ops,
8578 #endif
8579 #if defined(CONFIG_NFS_V4_2)
8580         [2] = &nfs_v4_2_minor_ops,
8581 #endif
8582 };
8583
8584 static const struct inode_operations nfs4_dir_inode_operations = {
8585         .create         = nfs_create,
8586         .lookup         = nfs_lookup,
8587         .atomic_open    = nfs_atomic_open,
8588         .link           = nfs_link,
8589         .unlink         = nfs_unlink,
8590         .symlink        = nfs_symlink,
8591         .mkdir          = nfs_mkdir,
8592         .rmdir          = nfs_rmdir,
8593         .mknod          = nfs_mknod,
8594         .rename         = nfs_rename,
8595         .permission     = nfs_permission,
8596         .getattr        = nfs_getattr,
8597         .setattr        = nfs_setattr,
8598         .getxattr       = generic_getxattr,
8599         .setxattr       = generic_setxattr,
8600         .listxattr      = generic_listxattr,
8601         .removexattr    = generic_removexattr,
8602 };
8603
8604 static const struct inode_operations nfs4_file_inode_operations = {
8605         .permission     = nfs_permission,
8606         .getattr        = nfs_getattr,
8607         .setattr        = nfs_setattr,
8608         .getxattr       = generic_getxattr,
8609         .setxattr       = generic_setxattr,
8610         .listxattr      = generic_listxattr,
8611         .removexattr    = generic_removexattr,
8612 };
8613
8614 const struct nfs_rpc_ops nfs_v4_clientops = {
8615         .version        = 4,                    /* protocol version */
8616         .dentry_ops     = &nfs4_dentry_operations,
8617         .dir_inode_ops  = &nfs4_dir_inode_operations,
8618         .file_inode_ops = &nfs4_file_inode_operations,
8619         .file_ops       = &nfs4_file_operations,
8620         .getroot        = nfs4_proc_get_root,
8621         .submount       = nfs4_submount,
8622         .try_mount      = nfs4_try_mount,
8623         .getattr        = nfs4_proc_getattr,
8624         .setattr        = nfs4_proc_setattr,
8625         .lookup         = nfs4_proc_lookup,
8626         .access         = nfs4_proc_access,
8627         .readlink       = nfs4_proc_readlink,
8628         .create         = nfs4_proc_create,
8629         .remove         = nfs4_proc_remove,
8630         .unlink_setup   = nfs4_proc_unlink_setup,
8631         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8632         .unlink_done    = nfs4_proc_unlink_done,
8633         .rename_setup   = nfs4_proc_rename_setup,
8634         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8635         .rename_done    = nfs4_proc_rename_done,
8636         .link           = nfs4_proc_link,
8637         .symlink        = nfs4_proc_symlink,
8638         .mkdir          = nfs4_proc_mkdir,
8639         .rmdir          = nfs4_proc_remove,
8640         .readdir        = nfs4_proc_readdir,
8641         .mknod          = nfs4_proc_mknod,
8642         .statfs         = nfs4_proc_statfs,
8643         .fsinfo         = nfs4_proc_fsinfo,
8644         .pathconf       = nfs4_proc_pathconf,
8645         .set_capabilities = nfs4_server_capabilities,
8646         .decode_dirent  = nfs4_decode_dirent,
8647         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8648         .read_setup     = nfs4_proc_read_setup,
8649         .read_done      = nfs4_read_done,
8650         .write_setup    = nfs4_proc_write_setup,
8651         .write_done     = nfs4_write_done,
8652         .commit_setup   = nfs4_proc_commit_setup,
8653         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8654         .commit_done    = nfs4_commit_done,
8655         .lock           = nfs4_proc_lock,
8656         .clear_acl_cache = nfs4_zap_acl_attr,
8657         .close_context  = nfs4_close_context,
8658         .open_context   = nfs4_atomic_open,
8659         .have_delegation = nfs4_have_delegation,
8660         .return_delegation = nfs4_inode_return_delegation,
8661         .alloc_client   = nfs4_alloc_client,
8662         .init_client    = nfs4_init_client,
8663         .free_client    = nfs4_free_client,
8664         .create_server  = nfs4_create_server,
8665         .clone_server   = nfs_clone_server,
8666 };
8667
8668 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8669         .prefix = XATTR_NAME_NFSV4_ACL,
8670         .list   = nfs4_xattr_list_nfs4_acl,
8671         .get    = nfs4_xattr_get_nfs4_acl,
8672         .set    = nfs4_xattr_set_nfs4_acl,
8673 };
8674
8675 const struct xattr_handler *nfs4_xattr_handlers[] = {
8676         &nfs4_xattr_nfs4_acl_handler,
8677 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8678         &nfs4_xattr_nfs4_label_handler,
8679 #endif
8680         NULL
8681 };
8682
8683 /*
8684  * Local variables:
8685  *  c-basic-offset: 8
8686  * End:
8687  */