fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         if (NFS_SERVER(dir)->nfs_client->cl_minorversion < 2)
 109                 return NULL;
 110
 111         err = security_dentry_init_security(dentry, sattr->ia_mode,
 112                                 &dentry->d_name, (void **)&label->label, &label->len);
 113         if (err == 0)
 114                 return label;
 115
 116         return NULL;
 117 }
 118 static inline void
 119 nfs4_label_release_security(struct nfs4_label *label)
 120 {
 121         if (label)
 122                 security_release_secctx(label->label, label->len);
 123 }
 124 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 125 {
 126         if (label)
 127                 return server->attr_bitmask;
 128
 129         return server->attr_bitmask_nl;
 130 }
 131 #else
 132 static inline struct nfs4_label *
 133 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 134         struct iattr *sattr, struct nfs4_label *l)
 135 { return NULL; }
 136 static inline void
 137 nfs4_label_release_security(struct nfs4_label *label)
 138 { return; }
 139 static inline u32 *
 140 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 141 { return server->attr_bitmask; }
 142 #endif
 143
 144 /* Prevent leaks of NFSv4 errors into userland */
 145 static int nfs4_map_errors(int err)
 146 {
 147         if (err >= -1000)
 148                 return err;
 149         switch (err) {
 150         case -NFS4ERR_RESOURCE:
 151         case -NFS4ERR_LAYOUTTRYLATER:
 152         case -NFS4ERR_RECALLCONFLICT:
 153                 return -EREMOTEIO;
 154         case -NFS4ERR_WRONGSEC:
 155         case -NFS4ERR_WRONG_CRED:
 156                 return -EPERM;
 157         case -NFS4ERR_BADOWNER:
 158         case -NFS4ERR_BADNAME:
 159                 return -EINVAL;
 160         case -NFS4ERR_SHARE_DENIED:
 161                 return -EACCES;
 162         case -NFS4ERR_MINOR_VERS_MISMATCH:
 163                 return -EPROTONOSUPPORT;
 164         case -NFS4ERR_ACCESS:
 165                 return -EACCES;
 166         case -NFS4ERR_FILE_OPEN:
 167                 return -EBUSY;
 168         default:
 169                 dprintk("%s could not handle NFSv4 error %d\n",
 170                                 __func__, -err);
 171                 break;
 172         }
 173         return -EIO;
 174 }
 175
 176 /*
 177  * This is our standard bitmap for GETATTR requests.
 178  */
 179 const u32 nfs4_fattr_bitmap[3] = {
 180         FATTR4_WORD0_TYPE
 181         | FATTR4_WORD0_CHANGE
 182         | FATTR4_WORD0_SIZE
 183         | FATTR4_WORD0_FSID
 184         | FATTR4_WORD0_FILEID,
 185         FATTR4_WORD1_MODE
 186         | FATTR4_WORD1_NUMLINKS
 187         | FATTR4_WORD1_OWNER
 188         | FATTR4_WORD1_OWNER_GROUP
 189         | FATTR4_WORD1_RAWDEV
 190         | FATTR4_WORD1_SPACE_USED
 191         | FATTR4_WORD1_TIME_ACCESS
 192         | FATTR4_WORD1_TIME_METADATA
 193         | FATTR4_WORD1_TIME_MODIFY,
 194 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 195         FATTR4_WORD2_SECURITY_LABEL
 196 #endif
 197 };
 198
 199 static const u32 nfs4_pnfs_open_bitmap[3] = {
 200         FATTR4_WORD0_TYPE
 201         | FATTR4_WORD0_CHANGE
 202         | FATTR4_WORD0_SIZE
 203         | FATTR4_WORD0_FSID
 204         | FATTR4_WORD0_FILEID,
 205         FATTR4_WORD1_MODE
 206         | FATTR4_WORD1_NUMLINKS
 207         | FATTR4_WORD1_OWNER
 208         | FATTR4_WORD1_OWNER_GROUP
 209         | FATTR4_WORD1_RAWDEV
 210         | FATTR4_WORD1_SPACE_USED
 211         | FATTR4_WORD1_TIME_ACCESS
 212         | FATTR4_WORD1_TIME_METADATA
 213         | FATTR4_WORD1_TIME_MODIFY,
 214         FATTR4_WORD2_MDSTHRESHOLD
 215 };
 216
 217 static const u32 nfs4_open_noattr_bitmap[3] = {
 218         FATTR4_WORD0_TYPE
 219         | FATTR4_WORD0_CHANGE
 220         | FATTR4_WORD0_FILEID,
 221 };
 222
 223 const u32 nfs4_statfs_bitmap[3] = {
 224         FATTR4_WORD0_FILES_AVAIL
 225         | FATTR4_WORD0_FILES_FREE
 226         | FATTR4_WORD0_FILES_TOTAL,
 227         FATTR4_WORD1_SPACE_AVAIL
 228         | FATTR4_WORD1_SPACE_FREE
 229         | FATTR4_WORD1_SPACE_TOTAL
 230 };
 231
 232 const u32 nfs4_pathconf_bitmap[3] = {
 233         FATTR4_WORD0_MAXLINK
 234         | FATTR4_WORD0_MAXNAME,
 235         0
 236 };
 237
 238 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 239                         | FATTR4_WORD0_MAXREAD
 240                         | FATTR4_WORD0_MAXWRITE
 241                         | FATTR4_WORD0_LEASE_TIME,
 242                         FATTR4_WORD1_TIME_DELTA
 243                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 244                         FATTR4_WORD2_LAYOUT_BLKSIZE
 245 };
 246
 247 const u32 nfs4_fs_locations_bitmap[3] = {
 248         FATTR4_WORD0_TYPE
 249         | FATTR4_WORD0_CHANGE
 250         | FATTR4_WORD0_SIZE
 251         | FATTR4_WORD0_FSID
 252         | FATTR4_WORD0_FILEID
 253         | FATTR4_WORD0_FS_LOCATIONS,
 254         FATTR4_WORD1_MODE
 255         | FATTR4_WORD1_NUMLINKS
 256         | FATTR4_WORD1_OWNER
 257         | FATTR4_WORD1_OWNER_GROUP
 258         | FATTR4_WORD1_RAWDEV
 259         | FATTR4_WORD1_SPACE_USED
 260         | FATTR4_WORD1_TIME_ACCESS
 261         | FATTR4_WORD1_TIME_METADATA
 262         | FATTR4_WORD1_TIME_MODIFY
 263         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 264 };
 265
 266 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 267                 struct nfs4_readdir_arg *readdir)
 268 {
 269         __be32 *start, *p;
 270
 271         if (cookie > 2) {
 272                 readdir->cookie = cookie;
 273                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 274                 return;
 275         }
 276
 277         readdir->cookie = 0;
 278         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 279         if (cookie == 2)
 280                 return;
 281
 282         /*
 283          * NFSv4 servers do not return entries for '.' and '..'
 284          * Therefore, we fake these entries here.  We let '.'
 285          * have cookie 0 and '..' have cookie 1.  Note that
 286          * when talking to the server, we always send cookie 0
 287          * instead of 1 or 2.
 288          */
 289         start = p = kmap_atomic(*readdir->pages);
 290
 291         if (cookie == 0) {
 292                 *p++ = xdr_one;                                  /* next */
 293                 *p++ = xdr_zero;                   /* cookie, first word */
 294                 *p++ = xdr_one;                   /* cookie, second word */
 295                 *p++ = xdr_one;                             /* entry len */
 296                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 297                 p++;
 298                 *p++ = xdr_one;                         /* bitmap length */
 299                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 300                 *p++ = htonl(8);              /* attribute buffer length */
 301                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 302         }
 303
 304         *p++ = xdr_one;                                  /* next */
 305         *p++ = xdr_zero;                   /* cookie, first word */
 306         *p++ = xdr_two;                   /* cookie, second word */
 307         *p++ = xdr_two;                             /* entry len */
 308         memcpy(p, "..\0\0", 4);                         /* entry */
 309         p++;
 310         *p++ = xdr_one;                         /* bitmap length */
 311         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 312         *p++ = htonl(8);              /* attribute buffer length */
 313         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 314
 315         readdir->pgbase = (char *)p - (char *)start;
 316         readdir->count -= readdir->pgbase;
 317         kunmap_atomic(start);
 318 }
 319
 320 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 321 {
 322         int res = 0;
 323
 324         might_sleep();
 325
 326         if (*timeout <= 0)
 327                 *timeout = NFS4_POLL_RETRY_MIN;
 328         if (*timeout > NFS4_POLL_RETRY_MAX)
 329                 *timeout = NFS4_POLL_RETRY_MAX;
 330         freezable_schedule_timeout_killable_unsafe(*timeout);
 331         if (fatal_signal_pending(current))
 332                 res = -ERESTARTSYS;
 333         *timeout <<= 1;
 334         return res;
 335 }
 336
 337 /* This is the error handling routine for processes that are allowed
 338  * to sleep.
 339  */
 340 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 341 {
 342         struct nfs_client *clp = server->nfs_client;
 343         struct nfs4_state *state = exception->state;
 344         struct inode *inode = exception->inode;
 345         int ret = errorcode;
 346
 347         exception->retry = 0;
 348         switch(errorcode) {
 349                 case 0:
 350                         return 0;
 351                 case -NFS4ERR_OPENMODE:
 352                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 353                                 nfs4_inode_return_delegation(inode);
 354                                 exception->retry = 1;
 355                                 return 0;
 356                         }
 357                         if (state == NULL)
 358                                 break;
 359                         ret = nfs4_schedule_stateid_recovery(server, state);
 360                         if (ret < 0)
 361                                 break;
 362                         goto wait_on_recovery;
 363                 case -NFS4ERR_DELEG_REVOKED:
 364                 case -NFS4ERR_ADMIN_REVOKED:
 365                 case -NFS4ERR_BAD_STATEID:
 366                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 367                                 nfs_remove_bad_delegation(inode);
 368                                 exception->retry = 1;
 369                                 break;
 370                         }
 371                         if (state == NULL)
 372                                 break;
 373                         ret = nfs4_schedule_stateid_recovery(server, state);
 374                         if (ret < 0)
 375                                 break;
 376                         goto wait_on_recovery;
 377                 case -NFS4ERR_EXPIRED:
 378                         if (state != NULL) {
 379                                 ret = nfs4_schedule_stateid_recovery(server, state);
 380                                 if (ret < 0)
 381                                         break;
 382                         }
 383                 case -NFS4ERR_STALE_STATEID:
 384                 case -NFS4ERR_STALE_CLIENTID:
 385                         nfs4_schedule_lease_recovery(clp);
 386                         goto wait_on_recovery;
 387                 case -NFS4ERR_MOVED:
 388                         ret = nfs4_schedule_migration_recovery(server);
 389                         if (ret < 0)
 390                                 break;
 391                         goto wait_on_recovery;
 392 #if defined(CONFIG_NFS_V4_1)
 393                 case -NFS4ERR_BADSESSION:
 394                 case -NFS4ERR_BADSLOT:
 395                 case -NFS4ERR_BAD_HIGH_SLOT:
 396                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 397                 case -NFS4ERR_DEADSESSION:
 398                 case -NFS4ERR_SEQ_FALSE_RETRY:
 399                 case -NFS4ERR_SEQ_MISORDERED:
 400                         dprintk("%s ERROR: %d Reset session\n", __func__,
 401                                 errorcode);
 402                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 403                         goto wait_on_recovery;
 404 #endif /* defined(CONFIG_NFS_V4_1) */
 405                 case -NFS4ERR_FILE_OPEN:
 406                         if (exception->timeout > HZ) {
 407                                 /* We have retried a decent amount, time to
 408                                  * fail
 409                                  */
 410                                 ret = -EBUSY;
 411                                 break;
 412                         }
 413                 case -NFS4ERR_GRACE:
 414                 case -NFS4ERR_DELAY:
 415                         ret = nfs4_delay(server->client, &exception->timeout);
 416                         if (ret != 0)
 417                                 break;
 418                 case -NFS4ERR_RETRY_UNCACHED_REP:
 419                 case -NFS4ERR_OLD_STATEID:
 420                         exception->retry = 1;
 421                         break;
 422                 case -NFS4ERR_BADOWNER:
 423                         /* The following works around a Linux server bug! */
 424                 case -NFS4ERR_BADNAME:
 425                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 426                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 427                                 exception->retry = 1;
 428                                 printk(KERN_WARNING "NFS: v4 server %s "
 429                                                 "does not accept raw "
 430                                                 "uid/gids. "
 431                                                 "Reenabling the idmapper.\n",
 432                                                 server->nfs_client->cl_hostname);
 433                         }
 434         }
 435         /* We failed to handle the error */
 436         return nfs4_map_errors(ret);
 437 wait_on_recovery:
 438         ret = nfs4_wait_clnt_recover(clp);
 439         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 440                 return -EIO;
 441         if (ret == 0)
 442                 exception->retry = 1;
 443         return ret;
 444 }
 445
 446 /*
 447  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 448  * or 'false' otherwise.
 449  */
 450 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 451 {
 452         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 453
 454         if (flavor == RPC_AUTH_GSS_KRB5I ||
 455             flavor == RPC_AUTH_GSS_KRB5P)
 456                 return true;
 457
 458         return false;
 459 }
 460
 461 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 462 {
 463         spin_lock(&clp->cl_lock);
 464         if (time_before(clp->cl_last_renewal,timestamp))
 465                 clp->cl_last_renewal = timestamp;
 466         spin_unlock(&clp->cl_lock);
 467 }
 468
 469 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 470 {
 471         do_renew_lease(server->nfs_client, timestamp);
 472 }
 473
 474 struct nfs4_call_sync_data {
 475         const struct nfs_server *seq_server;
 476         struct nfs4_sequence_args *seq_args;
 477         struct nfs4_sequence_res *seq_res;
 478 };
 479
 480 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 481                                struct nfs4_sequence_res *res, int cache_reply)
 482 {
 483         args->sa_slot = NULL;
 484         args->sa_cache_this = cache_reply;
 485         args->sa_privileged = 0;
 486
 487         res->sr_slot = NULL;
 488 }
 489
 490 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 491 {
 492         args->sa_privileged = 1;
 493 }
 494
 495 static int nfs40_setup_sequence(const struct nfs_server *server,
 496                                 struct nfs4_sequence_args *args,
 497                                 struct nfs4_sequence_res *res,
 498                                 struct rpc_task *task)
 499 {
 500         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 501         struct nfs4_slot *slot;
 502
 503         /* slot already allocated? */
 504         if (res->sr_slot != NULL)
 505                 goto out_start;
 506
 507         spin_lock(&tbl->slot_tbl_lock);
 508         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 509                 goto out_sleep;
 510
 511         slot = nfs4_alloc_slot(tbl);
 512         if (IS_ERR(slot)) {
 513                 if (slot == ERR_PTR(-ENOMEM))
 514                         task->tk_timeout = HZ >> 2;
 515                 goto out_sleep;
 516         }
 517         spin_unlock(&tbl->slot_tbl_lock);
 518
 519         args->sa_slot = slot;
 520         res->sr_slot = slot;
 521
 522 out_start:
 523         rpc_call_start(task);
 524         return 0;
 525
 526 out_sleep:
 527         if (args->sa_privileged)
 528                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 529                                 NULL, RPC_PRIORITY_PRIVILEGED);
 530         else
 531                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 532         spin_unlock(&tbl->slot_tbl_lock);
 533         return -EAGAIN;
 534 }
 535
 536 static int nfs40_sequence_done(struct rpc_task *task,
 537                                struct nfs4_sequence_res *res)
 538 {
 539         struct nfs4_slot *slot = res->sr_slot;
 540         struct nfs4_slot_table *tbl;
 541
 542         if (!RPC_WAS_SENT(task))
 543                 goto out;
 544
 545         tbl = slot->table;
 546         spin_lock(&tbl->slot_tbl_lock);
 547         if (!nfs41_wake_and_assign_slot(tbl, slot))
 548                 nfs4_free_slot(tbl, slot);
 549         spin_unlock(&tbl->slot_tbl_lock);
 550
 551         res->sr_slot = NULL;
 552 out:
 553         return 1;
 554 }
 555
 556 #if defined(CONFIG_NFS_V4_1)
 557
 558 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 559 {
 560         struct nfs4_session *session;
 561         struct nfs4_slot_table *tbl;
 562         bool send_new_highest_used_slotid = false;
 563
 564         if (!res->sr_slot) {
 565                 /* just wake up the next guy waiting since
 566                  * we may have not consumed a slot after all */
 567                 dprintk("%s: No slot\n", __func__);
 568                 return;
 569         }
 570         tbl = res->sr_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, res->sr_slot)) {
 581                 send_new_highest_used_slotid = false;
 582                 goto out_unlock;
 583         }
 584         nfs4_free_slot(tbl, res->sr_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 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 596 {
 597         struct nfs4_session *session;
 598         struct nfs4_slot *slot;
 599         struct nfs_client *clp;
 600         bool interrupted = false;
 601         int ret = 1;
 602
 603         /* don't increment the sequence number if the task wasn't sent */
 604         if (!RPC_WAS_SENT(task))
 605                 goto out;
 606
 607         slot = res->sr_slot;
 608         session = slot->table->session;
 609
 610         if (slot->interrupted) {
 611                 slot->interrupted = 0;
 612                 interrupted = true;
 613         }
 614
 615         trace_nfs4_sequence_done(session, res);
 616         /* Check the SEQUENCE operation status */
 617         switch (res->sr_status) {
 618         case 0:
 619                 /* Update the slot's sequence and clientid lease timer */
 620                 ++slot->seq_nr;
 621                 clp = session->clp;
 622                 do_renew_lease(clp, res->sr_timestamp);
 623                 /* Check sequence flags */
 624                 if (res->sr_status_flags != 0)
 625                         nfs4_schedule_lease_recovery(clp);
 626                 nfs41_update_target_slotid(slot->table, slot, res);
 627                 break;
 628         case 1:
 629                 /*
 630                  * sr_status remains 1 if an RPC level error occurred.
 631                  * The server may or may not have processed the sequence
 632                  * operation..
 633                  * Mark the slot as having hosted an interrupted RPC call.
 634                  */
 635                 slot->interrupted = 1;
 636                 goto out;
 637         case -NFS4ERR_DELAY:
 638                 /* The server detected a resend of the RPC call and
 639                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 640                  * of RFC5661.
 641                  */
 642                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 643                         __func__,
 644                         slot->slot_nr,
 645                         slot->seq_nr);
 646                 goto out_retry;
 647         case -NFS4ERR_BADSLOT:
 648                 /*
 649                  * The slot id we used was probably retired. Try again
 650                  * using a different slot id.
 651                  */
 652                 goto retry_nowait;
 653         case -NFS4ERR_SEQ_MISORDERED:
 654                 /*
 655                  * Was the last operation on this sequence interrupted?
 656                  * If so, retry after bumping the sequence number.
 657                  */
 658                 if (interrupted) {
 659                         ++slot->seq_nr;
 660                         goto retry_nowait;
 661                 }
 662                 /*
 663                  * Could this slot have been previously retired?
 664                  * If so, then the server may be expecting seq_nr = 1!
 665                  */
 666                 if (slot->seq_nr != 1) {
 667                         slot->seq_nr = 1;
 668                         goto retry_nowait;
 669                 }
 670                 break;
 671         case -NFS4ERR_SEQ_FALSE_RETRY:
 672                 ++slot->seq_nr;
 673                 goto retry_nowait;
 674         default:
 675                 /* Just update the slot sequence no. */
 676                 ++slot->seq_nr;
 677         }
 678 out:
 679         /* The session may be reset by one of the error handlers. */
 680         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 681         nfs41_sequence_free_slot(res);
 682         return ret;
 683 retry_nowait:
 684         if (rpc_restart_call_prepare(task)) {
 685                 task->tk_status = 0;
 686                 ret = 0;
 687         }
 688         goto out;
 689 out_retry:
 690         if (!rpc_restart_call(task))
 691                 goto out;
 692         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 693         return 0;
 694 }
 695
 696 static int nfs4_sequence_done(struct rpc_task *task,
 697                                struct nfs4_sequence_res *res)
 698 {
 699         if (res->sr_slot == NULL)
 700                 return 1;
 701         if (!res->sr_slot->table->session)
 702                 return nfs40_sequence_done(task, res);
 703         return nfs41_sequence_done(task, res);
 704 }
 705
 706 int nfs41_setup_sequence(struct nfs4_session *session,
 707                                 struct nfs4_sequence_args *args,
 708                                 struct nfs4_sequence_res *res,
 709                                 struct rpc_task *task)
 710 {
 711         struct nfs4_slot *slot;
 712         struct nfs4_slot_table *tbl;
 713
 714         dprintk("--> %s\n", __func__);
 715         /* slot already allocated? */
 716         if (res->sr_slot != NULL)
 717                 goto out_success;
 718
 719         tbl = &session->fc_slot_table;
 720
 721         task->tk_timeout = 0;
 722
 723         spin_lock(&tbl->slot_tbl_lock);
 724         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 725             !args->sa_privileged) {
 726                 /* The state manager will wait until the slot table is empty */
 727                 dprintk("%s session is draining\n", __func__);
 728                 goto out_sleep;
 729         }
 730
 731         slot = nfs4_alloc_slot(tbl);
 732         if (IS_ERR(slot)) {
 733                 /* If out of memory, try again in 1/4 second */
 734                 if (slot == ERR_PTR(-ENOMEM))
 735                         task->tk_timeout = HZ >> 2;
 736                 dprintk("<-- %s: no free slots\n", __func__);
 737                 goto out_sleep;
 738         }
 739         spin_unlock(&tbl->slot_tbl_lock);
 740
 741         args->sa_slot = slot;
 742
 743         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 744                         slot->slot_nr, slot->seq_nr);
 745
 746         res->sr_slot = slot;
 747         res->sr_timestamp = jiffies;
 748         res->sr_status_flags = 0;
 749         /*
 750          * sr_status is only set in decode_sequence, and so will remain
 751          * set to 1 if an rpc level failure occurs.
 752          */
 753         res->sr_status = 1;
 754         trace_nfs4_setup_sequence(session, args);
 755 out_success:
 756         rpc_call_start(task);
 757         return 0;
 758 out_sleep:
 759         /* Privileged tasks are queued with top priority */
 760         if (args->sa_privileged)
 761                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 762                                 NULL, RPC_PRIORITY_PRIVILEGED);
 763         else
 764                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 765         spin_unlock(&tbl->slot_tbl_lock);
 766         return -EAGAIN;
 767 }
 768 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 769
 770 static int nfs4_setup_sequence(const struct nfs_server *server,
 771                                struct nfs4_sequence_args *args,
 772                                struct nfs4_sequence_res *res,
 773                                struct rpc_task *task)
 774 {
 775         struct nfs4_session *session = nfs4_get_session(server);
 776         int ret = 0;
 777
 778         if (!session)
 779                 return nfs40_setup_sequence(server, args, res, task);
 780
 781         dprintk("--> %s clp %p session %p sr_slot %u\n",
 782                 __func__, session->clp, session, res->sr_slot ?
 783                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 784
 785         ret = nfs41_setup_sequence(session, args, res, task);
 786
 787         dprintk("<-- %s status=%d\n", __func__, ret);
 788         return ret;
 789 }
 790
 791 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 792 {
 793         struct nfs4_call_sync_data *data = calldata;
 794         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 795
 796         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 797
 798         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 799 }
 800
 801 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 802 {
 803         struct nfs4_call_sync_data *data = calldata;
 804
 805         nfs41_sequence_done(task, data->seq_res);
 806 }
 807
 808 static const struct rpc_call_ops nfs41_call_sync_ops = {
 809         .rpc_call_prepare = nfs41_call_sync_prepare,
 810         .rpc_call_done = nfs41_call_sync_done,
 811 };
 812
 813 #else   /* !CONFIG_NFS_V4_1 */
 814
 815 static int nfs4_setup_sequence(const struct nfs_server *server,
 816                                struct nfs4_sequence_args *args,
 817                                struct nfs4_sequence_res *res,
 818                                struct rpc_task *task)
 819 {
 820         return nfs40_setup_sequence(server, args, res, task);
 821 }
 822
 823 static int nfs4_sequence_done(struct rpc_task *task,
 824                                struct nfs4_sequence_res *res)
 825 {
 826         return nfs40_sequence_done(task, res);
 827 }
 828
 829 #endif  /* !CONFIG_NFS_V4_1 */
 830
 831 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 832 {
 833         struct nfs4_call_sync_data *data = calldata;
 834         nfs4_setup_sequence(data->seq_server,
 835                                 data->seq_args, data->seq_res, task);
 836 }
 837
 838 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 839 {
 840         struct nfs4_call_sync_data *data = calldata;
 841         nfs4_sequence_done(task, data->seq_res);
 842 }
 843
 844 static const struct rpc_call_ops nfs40_call_sync_ops = {
 845         .rpc_call_prepare = nfs40_call_sync_prepare,
 846         .rpc_call_done = nfs40_call_sync_done,
 847 };
 848
 849 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 850                                    struct nfs_server *server,
 851                                    struct rpc_message *msg,
 852                                    struct nfs4_sequence_args *args,
 853                                    struct nfs4_sequence_res *res)
 854 {
 855         int ret;
 856         struct rpc_task *task;
 857         struct nfs_client *clp = server->nfs_client;
 858         struct nfs4_call_sync_data data = {
 859                 .seq_server = server,
 860                 .seq_args = args,
 861                 .seq_res = res,
 862         };
 863         struct rpc_task_setup task_setup = {
 864                 .rpc_client = clnt,
 865                 .rpc_message = msg,
 866                 .callback_ops = clp->cl_mvops->call_sync_ops,
 867                 .callback_data = &data
 868         };
 869
 870         task = rpc_run_task(&task_setup);
 871         if (IS_ERR(task))
 872                 ret = PTR_ERR(task);
 873         else {
 874                 ret = task->tk_status;
 875                 rpc_put_task(task);
 876         }
 877         return ret;
 878 }
 879
 880 static
 881 int nfs4_call_sync(struct rpc_clnt *clnt,
 882                    struct nfs_server *server,
 883                    struct rpc_message *msg,
 884                    struct nfs4_sequence_args *args,
 885                    struct nfs4_sequence_res *res,
 886                    int cache_reply)
 887 {
 888         nfs4_init_sequence(args, res, cache_reply);
 889         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 890 }
 891
 892 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 893 {
 894         struct nfs_inode *nfsi = NFS_I(dir);
 895
 896         spin_lock(&dir->i_lock);
 897         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 898         if (!cinfo->atomic || cinfo->before != dir->i_version)
 899                 nfs_force_lookup_revalidate(dir);
 900         dir->i_version = cinfo->after;
 901         nfs_fscache_invalidate(dir);
 902         spin_unlock(&dir->i_lock);
 903 }
 904
 905 struct nfs4_opendata {
 906         struct kref kref;
 907         struct nfs_openargs o_arg;
 908         struct nfs_openres o_res;
 909         struct nfs_open_confirmargs c_arg;
 910         struct nfs_open_confirmres c_res;
 911         struct nfs4_string owner_name;
 912         struct nfs4_string group_name;
 913         struct nfs_fattr f_attr;
 914         struct nfs4_label *f_label;
 915         struct dentry *dir;
 916         struct dentry *dentry;
 917         struct nfs4_state_owner *owner;
 918         struct nfs4_state *state;
 919         struct iattr attrs;
 920         unsigned long timestamp;
 921         unsigned int rpc_done : 1;
 922         unsigned int file_created : 1;
 923         unsigned int is_recover : 1;
 924         int rpc_status;
 925         int cancelled;
 926 };
 927
 928 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 929                 int err, struct nfs4_exception *exception)
 930 {
 931         if (err != -EINVAL)
 932                 return false;
 933         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 934                 return false;
 935         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 936         exception->retry = 1;
 937         return true;
 938 }
 939
 940 static enum open_claim_type4
 941 nfs4_map_atomic_open_claim(struct nfs_server *server,
 942                 enum open_claim_type4 claim)
 943 {
 944         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 945                 return claim;
 946         switch (claim) {
 947         default:
 948                 return claim;
 949         case NFS4_OPEN_CLAIM_FH:
 950                 return NFS4_OPEN_CLAIM_NULL;
 951         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 952                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 953         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 954                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 955         }
 956 }
 957
 958 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 959 {
 960         p->o_res.f_attr = &p->f_attr;
 961         p->o_res.f_label = p->f_label;
 962         p->o_res.seqid = p->o_arg.seqid;
 963         p->c_res.seqid = p->c_arg.seqid;
 964         p->o_res.server = p->o_arg.server;
 965         p->o_res.access_request = p->o_arg.access;
 966         nfs_fattr_init(&p->f_attr);
 967         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 968 }
 969
 970 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 971                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 972                 const struct iattr *attrs,
 973                 struct nfs4_label *label,
 974                 enum open_claim_type4 claim,
 975                 gfp_t gfp_mask)
 976 {
 977         struct dentry *parent = dget_parent(dentry);
 978         struct inode *dir = parent->d_inode;
 979         struct nfs_server *server = NFS_SERVER(dir);
 980         struct nfs4_opendata *p;
 981
 982         p = kzalloc(sizeof(*p), gfp_mask);
 983         if (p == NULL)
 984                 goto err;
 985
 986         p->f_label = nfs4_label_alloc(server, gfp_mask);
 987         if (IS_ERR(p->f_label))
 988                 goto err_free_p;
 989
 990         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 991         if (p->o_arg.seqid == NULL)
 992                 goto err_free_label;
 993         nfs_sb_active(dentry->d_sb);
 994         p->dentry = dget(dentry);
 995         p->dir = parent;
 996         p->owner = sp;
 997         atomic_inc(&sp->so_count);
 998         p->o_arg.open_flags = flags;
 999         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1000         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1001          * will return permission denied for all bits until close */
1002         if (!(flags & O_EXCL)) {
1003                 /* ask server to check for all possible rights as results
1004                  * are cached */
1005                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1006                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1007         }
1008         p->o_arg.clientid = server->nfs_client->cl_clientid;
1009         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1010         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1011         p->o_arg.name = &dentry->d_name;
1012         p->o_arg.server = server;
1013         p->o_arg.bitmask = nfs4_bitmask(server, label);
1014         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1015         p->o_arg.label = label;
1016         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1017         switch (p->o_arg.claim) {
1018         case NFS4_OPEN_CLAIM_NULL:
1019         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1020         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1021                 p->o_arg.fh = NFS_FH(dir);
1022                 break;
1023         case NFS4_OPEN_CLAIM_PREVIOUS:
1024         case NFS4_OPEN_CLAIM_FH:
1025         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1026         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1027                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1028         }
1029         if (attrs != NULL && attrs->ia_valid != 0) {
1030                 __u32 verf[2];
1031
1032                 p->o_arg.u.attrs = &p->attrs;
1033                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1034
1035                 verf[0] = jiffies;
1036                 verf[1] = current->pid;
1037                 memcpy(p->o_arg.u.verifier.data, verf,
1038                                 sizeof(p->o_arg.u.verifier.data));
1039         }
1040         p->c_arg.fh = &p->o_res.fh;
1041         p->c_arg.stateid = &p->o_res.stateid;
1042         p->c_arg.seqid = p->o_arg.seqid;
1043         nfs4_init_opendata_res(p);
1044         kref_init(&p->kref);
1045         return p;
1046
1047 err_free_label:
1048         nfs4_label_free(p->f_label);
1049 err_free_p:
1050         kfree(p);
1051 err:
1052         dput(parent);
1053         return NULL;
1054 }
1055
1056 static void nfs4_opendata_free(struct kref *kref)
1057 {
1058         struct nfs4_opendata *p = container_of(kref,
1059                         struct nfs4_opendata, kref);
1060         struct super_block *sb = p->dentry->d_sb;
1061
1062         nfs_free_seqid(p->o_arg.seqid);
1063         if (p->state != NULL)
1064                 nfs4_put_open_state(p->state);
1065         nfs4_put_state_owner(p->owner);
1066
1067         nfs4_label_free(p->f_label);
1068
1069         dput(p->dir);
1070         dput(p->dentry);
1071         nfs_sb_deactive(sb);
1072         nfs_fattr_free_names(&p->f_attr);
1073         kfree(p);
1074 }
1075
1076 static void nfs4_opendata_put(struct nfs4_opendata *p)
1077 {
1078         if (p != NULL)
1079                 kref_put(&p->kref, nfs4_opendata_free);
1080 }
1081
1082 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1083 {
1084         int ret;
1085
1086         ret = rpc_wait_for_completion_task(task);
1087         return ret;
1088 }
1089
1090 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1091 {
1092         int ret = 0;
1093
1094         if (open_mode & (O_EXCL|O_TRUNC))
1095                 goto out;
1096         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1097                 case FMODE_READ:
1098                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1099                                 && state->n_rdonly != 0;
1100                         break;
1101                 case FMODE_WRITE:
1102                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1103                                 && state->n_wronly != 0;
1104                         break;
1105                 case FMODE_READ|FMODE_WRITE:
1106                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1107                                 && state->n_rdwr != 0;
1108         }
1109 out:
1110         return ret;
1111 }
1112
1113 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1114 {
1115         if (delegation == NULL)
1116                 return 0;
1117         if ((delegation->type & fmode) != fmode)
1118                 return 0;
1119         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1120                 return 0;
1121         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1122                 return 0;
1123         nfs_mark_delegation_referenced(delegation);
1124         return 1;
1125 }
1126
1127 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1128 {
1129         switch (fmode) {
1130                 case FMODE_WRITE:
1131                         state->n_wronly++;
1132                         break;
1133                 case FMODE_READ:
1134                         state->n_rdonly++;
1135                         break;
1136                 case FMODE_READ|FMODE_WRITE:
1137                         state->n_rdwr++;
1138         }
1139         nfs4_state_set_mode_locked(state, state->state | fmode);
1140 }
1141
1142 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1143 {
1144         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1145                 nfs4_stateid_copy(&state->stateid, stateid);
1146         nfs4_stateid_copy(&state->open_stateid, stateid);
1147         set_bit(NFS_OPEN_STATE, &state->flags);
1148         switch (fmode) {
1149                 case FMODE_READ:
1150                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1151                         break;
1152                 case FMODE_WRITE:
1153                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1154                         break;
1155                 case FMODE_READ|FMODE_WRITE:
1156                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1157         }
1158 }
1159
1160 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1161 {
1162         write_seqlock(&state->seqlock);
1163         nfs_set_open_stateid_locked(state, stateid, fmode);
1164         write_sequnlock(&state->seqlock);
1165 }
1166
1167 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1168 {
1169         /*
1170          * Protect the call to nfs4_state_set_mode_locked and
1171          * serialise the stateid update
1172          */
1173         write_seqlock(&state->seqlock);
1174         if (deleg_stateid != NULL) {
1175                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1176                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1177         }
1178         if (open_stateid != NULL)
1179                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1180         write_sequnlock(&state->seqlock);
1181         spin_lock(&state->owner->so_lock);
1182         update_open_stateflags(state, fmode);
1183         spin_unlock(&state->owner->so_lock);
1184 }
1185
1186 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1187 {
1188         struct nfs_inode *nfsi = NFS_I(state->inode);
1189         struct nfs_delegation *deleg_cur;
1190         int ret = 0;
1191
1192         fmode &= (FMODE_READ|FMODE_WRITE);
1193
1194         rcu_read_lock();
1195         deleg_cur = rcu_dereference(nfsi->delegation);
1196         if (deleg_cur == NULL)
1197                 goto no_delegation;
1198
1199         spin_lock(&deleg_cur->lock);
1200         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1201            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1202             (deleg_cur->type & fmode) != fmode)
1203                 goto no_delegation_unlock;
1204
1205         if (delegation == NULL)
1206                 delegation = &deleg_cur->stateid;
1207         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1208                 goto no_delegation_unlock;
1209
1210         nfs_mark_delegation_referenced(deleg_cur);
1211         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1212         ret = 1;
1213 no_delegation_unlock:
1214         spin_unlock(&deleg_cur->lock);
1215 no_delegation:
1216         rcu_read_unlock();
1217
1218         if (!ret && open_stateid != NULL) {
1219                 __update_open_stateid(state, open_stateid, NULL, fmode);
1220                 ret = 1;
1221         }
1222
1223         return ret;
1224 }
1225
1226
1227 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1228 {
1229         struct nfs_delegation *delegation;
1230
1231         rcu_read_lock();
1232         delegation = rcu_dereference(NFS_I(inode)->delegation);
1233         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1234                 rcu_read_unlock();
1235                 return;
1236         }
1237         rcu_read_unlock();
1238         nfs4_inode_return_delegation(inode);
1239 }
1240
1241 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1242 {
1243         struct nfs4_state *state = opendata->state;
1244         struct nfs_inode *nfsi = NFS_I(state->inode);
1245         struct nfs_delegation *delegation;
1246         int open_mode = opendata->o_arg.open_flags;
1247         fmode_t fmode = opendata->o_arg.fmode;
1248         nfs4_stateid stateid;
1249         int ret = -EAGAIN;
1250
1251         for (;;) {
1252                 if (can_open_cached(state, fmode, open_mode)) {
1253                         spin_lock(&state->owner->so_lock);
1254                         if (can_open_cached(state, fmode, open_mode)) {
1255                                 update_open_stateflags(state, fmode);
1256                                 spin_unlock(&state->owner->so_lock);
1257                                 goto out_return_state;
1258                         }
1259                         spin_unlock(&state->owner->so_lock);
1260                 }
1261                 rcu_read_lock();
1262                 delegation = rcu_dereference(nfsi->delegation);
1263                 if (!can_open_delegated(delegation, fmode)) {
1264                         rcu_read_unlock();
1265                         break;
1266                 }
1267                 /* Save the delegation */
1268                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1269                 rcu_read_unlock();
1270                 nfs_release_seqid(opendata->o_arg.seqid);
1271                 if (!opendata->is_recover) {
1272                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1273                         if (ret != 0)
1274                                 goto out;
1275                 }
1276                 ret = -EAGAIN;
1277
1278                 /* Try to update the stateid using the delegation */
1279                 if (update_open_stateid(state, NULL, &stateid, fmode))
1280                         goto out_return_state;
1281         }
1282 out:
1283         return ERR_PTR(ret);
1284 out_return_state:
1285         atomic_inc(&state->count);
1286         return state;
1287 }
1288
1289 static void
1290 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1291 {
1292         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1293         struct nfs_delegation *delegation;
1294         int delegation_flags = 0;
1295
1296         rcu_read_lock();
1297         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1298         if (delegation)
1299                 delegation_flags = delegation->flags;
1300         rcu_read_unlock();
1301         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1302                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1303                                    "returning a delegation for "
1304                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1305                                    clp->cl_hostname);
1306         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1307                 nfs_inode_set_delegation(state->inode,
1308                                          data->owner->so_cred,
1309                                          &data->o_res);
1310         else
1311                 nfs_inode_reclaim_delegation(state->inode,
1312                                              data->owner->so_cred,
1313                                              &data->o_res);
1314 }
1315
1316 /*
1317  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1318  * and update the nfs4_state.
1319  */
1320 static struct nfs4_state *
1321 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1322 {
1323         struct inode *inode = data->state->inode;
1324         struct nfs4_state *state = data->state;
1325         int ret;
1326
1327         if (!data->rpc_done) {
1328                 if (data->rpc_status) {
1329                         ret = data->rpc_status;
1330                         goto err;
1331                 }
1332                 /* cached opens have already been processed */
1333                 goto update;
1334         }
1335
1336         ret = nfs_refresh_inode(inode, &data->f_attr);
1337         if (ret)
1338                 goto err;
1339
1340         if (data->o_res.delegation_type != 0)
1341                 nfs4_opendata_check_deleg(data, state);
1342 update:
1343         update_open_stateid(state, &data->o_res.stateid, NULL,
1344                             data->o_arg.fmode);
1345         atomic_inc(&state->count);
1346
1347         return state;
1348 err:
1349         return ERR_PTR(ret);
1350
1351 }
1352
1353 static struct nfs4_state *
1354 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1355 {
1356         struct inode *inode;
1357         struct nfs4_state *state = NULL;
1358         int ret;
1359
1360         if (!data->rpc_done) {
1361                 state = nfs4_try_open_cached(data);
1362                 goto out;
1363         }
1364
1365         ret = -EAGAIN;
1366         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1367                 goto err;
1368         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1369         ret = PTR_ERR(inode);
1370         if (IS_ERR(inode))
1371                 goto err;
1372         ret = -ENOMEM;
1373         state = nfs4_get_open_state(inode, data->owner);
1374         if (state == NULL)
1375                 goto err_put_inode;
1376         if (data->o_res.delegation_type != 0)
1377                 nfs4_opendata_check_deleg(data, state);
1378         update_open_stateid(state, &data->o_res.stateid, NULL,
1379                         data->o_arg.fmode);
1380         iput(inode);
1381 out:
1382         nfs_release_seqid(data->o_arg.seqid);
1383         return state;
1384 err_put_inode:
1385         iput(inode);
1386 err:
1387         return ERR_PTR(ret);
1388 }
1389
1390 static struct nfs4_state *
1391 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1392 {
1393         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1394                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1395         return _nfs4_opendata_to_nfs4_state(data);
1396 }
1397
1398 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1399 {
1400         struct nfs_inode *nfsi = NFS_I(state->inode);
1401         struct nfs_open_context *ctx;
1402
1403         spin_lock(&state->inode->i_lock);
1404         list_for_each_entry(ctx, &nfsi->open_files, list) {
1405                 if (ctx->state != state)
1406                         continue;
1407                 get_nfs_open_context(ctx);
1408                 spin_unlock(&state->inode->i_lock);
1409                 return ctx;
1410         }
1411         spin_unlock(&state->inode->i_lock);
1412         return ERR_PTR(-ENOENT);
1413 }
1414
1415 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1416                 struct nfs4_state *state, enum open_claim_type4 claim)
1417 {
1418         struct nfs4_opendata *opendata;
1419
1420         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1421                         NULL, NULL, claim, GFP_NOFS);
1422         if (opendata == NULL)
1423                 return ERR_PTR(-ENOMEM);
1424         opendata->state = state;
1425         atomic_inc(&state->count);
1426         return opendata;
1427 }
1428
1429 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1430 {
1431         struct nfs4_state *newstate;
1432         int ret;
1433
1434         opendata->o_arg.open_flags = 0;
1435         opendata->o_arg.fmode = fmode;
1436         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1437         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1438         nfs4_init_opendata_res(opendata);
1439         ret = _nfs4_recover_proc_open(opendata);
1440         if (ret != 0)
1441                 return ret;
1442         newstate = nfs4_opendata_to_nfs4_state(opendata);
1443         if (IS_ERR(newstate))
1444                 return PTR_ERR(newstate);
1445         nfs4_close_state(newstate, fmode);
1446         *res = newstate;
1447         return 0;
1448 }
1449
1450 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1451 {
1452         struct nfs4_state *newstate;
1453         int ret;
1454
1455         /* memory barrier prior to reading state->n_* */
1456         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1457         clear_bit(NFS_OPEN_STATE, &state->flags);
1458         smp_rmb();
1459         if (state->n_rdwr != 0) {
1460                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1461                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1462                 if (ret != 0)
1463                         return ret;
1464                 if (newstate != state)
1465                         return -ESTALE;
1466         }
1467         if (state->n_wronly != 0) {
1468                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1469                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1470                 if (ret != 0)
1471                         return ret;
1472                 if (newstate != state)
1473                         return -ESTALE;
1474         }
1475         if (state->n_rdonly != 0) {
1476                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1477                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1478                 if (ret != 0)
1479                         return ret;
1480                 if (newstate != state)
1481                         return -ESTALE;
1482         }
1483         /*
1484          * We may have performed cached opens for all three recoveries.
1485          * Check if we need to update the current stateid.
1486          */
1487         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1488             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1489                 write_seqlock(&state->seqlock);
1490                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1491                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1492                 write_sequnlock(&state->seqlock);
1493         }
1494         return 0;
1495 }
1496
1497 /*
1498  * OPEN_RECLAIM:
1499  *      reclaim state on the server after a reboot.
1500  */
1501 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1502 {
1503         struct nfs_delegation *delegation;
1504         struct nfs4_opendata *opendata;
1505         fmode_t delegation_type = 0;
1506         int status;
1507
1508         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1509                         NFS4_OPEN_CLAIM_PREVIOUS);
1510         if (IS_ERR(opendata))
1511                 return PTR_ERR(opendata);
1512         rcu_read_lock();
1513         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1514         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1515                 delegation_type = delegation->type;
1516         rcu_read_unlock();
1517         opendata->o_arg.u.delegation_type = delegation_type;
1518         status = nfs4_open_recover(opendata, state);
1519         nfs4_opendata_put(opendata);
1520         return status;
1521 }
1522
1523 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1524 {
1525         struct nfs_server *server = NFS_SERVER(state->inode);
1526         struct nfs4_exception exception = { };
1527         int err;
1528         do {
1529                 err = _nfs4_do_open_reclaim(ctx, state);
1530                 trace_nfs4_open_reclaim(ctx, 0, err);
1531                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1532                         continue;
1533                 if (err != -NFS4ERR_DELAY)
1534                         break;
1535                 nfs4_handle_exception(server, err, &exception);
1536         } while (exception.retry);
1537         return err;
1538 }
1539
1540 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1541 {
1542         struct nfs_open_context *ctx;
1543         int ret;
1544
1545         ctx = nfs4_state_find_open_context(state);
1546         if (IS_ERR(ctx))
1547                 return -EAGAIN;
1548         ret = nfs4_do_open_reclaim(ctx, state);
1549         put_nfs_open_context(ctx);
1550         return ret;
1551 }
1552
1553 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1554 {
1555         switch (err) {
1556                 default:
1557                         printk(KERN_ERR "NFS: %s: unhandled error "
1558                                         "%d.\n", __func__, err);
1559                 case 0:
1560                 case -ENOENT:
1561                 case -ESTALE:
1562                         break;
1563                 case -NFS4ERR_BADSESSION:
1564                 case -NFS4ERR_BADSLOT:
1565                 case -NFS4ERR_BAD_HIGH_SLOT:
1566                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1567                 case -NFS4ERR_DEADSESSION:
1568                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1569                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1570                         return -EAGAIN;
1571                 case -NFS4ERR_STALE_CLIENTID:
1572                 case -NFS4ERR_STALE_STATEID:
1573                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1574                 case -NFS4ERR_EXPIRED:
1575                         /* Don't recall a delegation if it was lost */
1576                         nfs4_schedule_lease_recovery(server->nfs_client);
1577                         return -EAGAIN;
1578                 case -NFS4ERR_DELEG_REVOKED:
1579                 case -NFS4ERR_ADMIN_REVOKED:
1580                 case -NFS4ERR_BAD_STATEID:
1581                 case -NFS4ERR_OPENMODE:
1582                         nfs_inode_find_state_and_recover(state->inode,
1583                                         stateid);
1584                         nfs4_schedule_stateid_recovery(server, state);
1585                         return 0;
1586                 case -NFS4ERR_DELAY:
1587                 case -NFS4ERR_GRACE:
1588                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1589                         ssleep(1);
1590                         return -EAGAIN;
1591                 case -ENOMEM:
1592                 case -NFS4ERR_DENIED:
1593                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1594                         return 0;
1595         }
1596         return err;
1597 }
1598
1599 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1600 {
1601         struct nfs_server *server = NFS_SERVER(state->inode);
1602         struct nfs4_opendata *opendata;
1603         int err;
1604
1605         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1606                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1607         if (IS_ERR(opendata))
1608                 return PTR_ERR(opendata);
1609         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1610         err = nfs4_open_recover(opendata, state);
1611         nfs4_opendata_put(opendata);
1612         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1613 }
1614
1615 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1616 {
1617         struct nfs4_opendata *data = calldata;
1618
1619         nfs40_setup_sequence(data->o_arg.server, &data->o_arg.seq_args,
1620                                 &data->o_res.seq_res, task);
1621 }
1622
1623 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1624 {
1625         struct nfs4_opendata *data = calldata;
1626
1627         nfs40_sequence_done(task, &data->o_res.seq_res);
1628
1629         data->rpc_status = task->tk_status;
1630         if (data->rpc_status == 0) {
1631                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1632                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1633                 renew_lease(data->o_res.server, data->timestamp);
1634                 data->rpc_done = 1;
1635         }
1636 }
1637
1638 static void nfs4_open_confirm_release(void *calldata)
1639 {
1640         struct nfs4_opendata *data = calldata;
1641         struct nfs4_state *state = NULL;
1642
1643         /* If this request hasn't been cancelled, do nothing */
1644         if (data->cancelled == 0)
1645                 goto out_free;
1646         /* In case of error, no cleanup! */
1647         if (!data->rpc_done)
1648                 goto out_free;
1649         state = nfs4_opendata_to_nfs4_state(data);
1650         if (!IS_ERR(state))
1651                 nfs4_close_state(state, data->o_arg.fmode);
1652 out_free:
1653         nfs4_opendata_put(data);
1654 }
1655
1656 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1657         .rpc_call_prepare = nfs4_open_confirm_prepare,
1658         .rpc_call_done = nfs4_open_confirm_done,
1659         .rpc_release = nfs4_open_confirm_release,
1660 };
1661
1662 /*
1663  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1664  */
1665 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1666 {
1667         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1668         struct rpc_task *task;
1669         struct  rpc_message msg = {
1670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1671                 .rpc_argp = &data->c_arg,
1672                 .rpc_resp = &data->c_res,
1673                 .rpc_cred = data->owner->so_cred,
1674         };
1675         struct rpc_task_setup task_setup_data = {
1676                 .rpc_client = server->client,
1677                 .rpc_message = &msg,
1678                 .callback_ops = &nfs4_open_confirm_ops,
1679                 .callback_data = data,
1680                 .workqueue = nfsiod_workqueue,
1681                 .flags = RPC_TASK_ASYNC,
1682         };
1683         int status;
1684
1685         nfs4_init_sequence(&data->o_arg.seq_args, &data->o_res.seq_res, 1);
1686         kref_get(&data->kref);
1687         data->rpc_done = 0;
1688         data->rpc_status = 0;
1689         data->timestamp = jiffies;
1690         task = rpc_run_task(&task_setup_data);
1691         if (IS_ERR(task))
1692                 return PTR_ERR(task);
1693         status = nfs4_wait_for_completion_rpc_task(task);
1694         if (status != 0) {
1695                 data->cancelled = 1;
1696                 smp_wmb();
1697         } else
1698                 status = data->rpc_status;
1699         rpc_put_task(task);
1700         return status;
1701 }
1702
1703 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1704 {
1705         struct nfs4_opendata *data = calldata;
1706         struct nfs4_state_owner *sp = data->owner;
1707         struct nfs_client *clp = sp->so_server->nfs_client;
1708
1709         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1710                 goto out_wait;
1711         /*
1712          * Check if we still need to send an OPEN call, or if we can use
1713          * a delegation instead.
1714          */
1715         if (data->state != NULL) {
1716                 struct nfs_delegation *delegation;
1717
1718                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1719                         goto out_no_action;
1720                 rcu_read_lock();
1721                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1722                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1723                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1724                     can_open_delegated(delegation, data->o_arg.fmode))
1725                         goto unlock_no_action;
1726                 rcu_read_unlock();
1727         }
1728         /* Update client id. */
1729         data->o_arg.clientid = clp->cl_clientid;
1730         switch (data->o_arg.claim) {
1731         case NFS4_OPEN_CLAIM_PREVIOUS:
1732         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1733         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1734                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1735         case NFS4_OPEN_CLAIM_FH:
1736                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1737                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1738         }
1739         data->timestamp = jiffies;
1740         if (nfs4_setup_sequence(data->o_arg.server,
1741                                 &data->o_arg.seq_args,
1742                                 &data->o_res.seq_res,
1743                                 task) != 0)
1744                 nfs_release_seqid(data->o_arg.seqid);
1745
1746         /* Set the create mode (note dependency on the session type) */
1747         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1748         if (data->o_arg.open_flags & O_EXCL) {
1749                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1750                 if (nfs4_has_persistent_session(clp))
1751                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1752                 else if (clp->cl_mvops->minor_version > 0)
1753                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1754         }
1755         return;
1756 unlock_no_action:
1757         rcu_read_unlock();
1758 out_no_action:
1759         task->tk_action = NULL;
1760 out_wait:
1761         nfs4_sequence_done(task, &data->o_res.seq_res);
1762 }
1763
1764 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1765 {
1766         struct nfs4_opendata *data = calldata;
1767
1768         data->rpc_status = task->tk_status;
1769
1770         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1771                 return;
1772
1773         if (task->tk_status == 0) {
1774                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1775                         switch (data->o_res.f_attr->mode & S_IFMT) {
1776                         case S_IFREG:
1777                                 break;
1778                         case S_IFLNK:
1779                                 data->rpc_status = -ELOOP;
1780                                 break;
1781                         case S_IFDIR:
1782                                 data->rpc_status = -EISDIR;
1783                                 break;
1784                         default:
1785                                 data->rpc_status = -ENOTDIR;
1786                         }
1787                 }
1788                 renew_lease(data->o_res.server, data->timestamp);
1789                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1790                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1791         }
1792         data->rpc_done = 1;
1793 }
1794
1795 static void nfs4_open_release(void *calldata)
1796 {
1797         struct nfs4_opendata *data = calldata;
1798         struct nfs4_state *state = NULL;
1799
1800         /* If this request hasn't been cancelled, do nothing */
1801         if (data->cancelled == 0)
1802                 goto out_free;
1803         /* In case of error, no cleanup! */
1804         if (data->rpc_status != 0 || !data->rpc_done)
1805                 goto out_free;
1806         /* In case we need an open_confirm, no cleanup! */
1807         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1808                 goto out_free;
1809         state = nfs4_opendata_to_nfs4_state(data);
1810         if (!IS_ERR(state))
1811                 nfs4_close_state(state, data->o_arg.fmode);
1812 out_free:
1813         nfs4_opendata_put(data);
1814 }
1815
1816 static const struct rpc_call_ops nfs4_open_ops = {
1817         .rpc_call_prepare = nfs4_open_prepare,
1818         .rpc_call_done = nfs4_open_done,
1819         .rpc_release = nfs4_open_release,
1820 };
1821
1822 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1823 {
1824         struct inode *dir = data->dir->d_inode;
1825         struct nfs_server *server = NFS_SERVER(dir);
1826         struct nfs_openargs *o_arg = &data->o_arg;
1827         struct nfs_openres *o_res = &data->o_res;
1828         struct rpc_task *task;
1829         struct rpc_message msg = {
1830                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1831                 .rpc_argp = o_arg,
1832                 .rpc_resp = o_res,
1833                 .rpc_cred = data->owner->so_cred,
1834         };
1835         struct rpc_task_setup task_setup_data = {
1836                 .rpc_client = server->client,
1837                 .rpc_message = &msg,
1838                 .callback_ops = &nfs4_open_ops,
1839                 .callback_data = data,
1840                 .workqueue = nfsiod_workqueue,
1841                 .flags = RPC_TASK_ASYNC,
1842         };
1843         int status;
1844
1845         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1846         kref_get(&data->kref);
1847         data->rpc_done = 0;
1848         data->rpc_status = 0;
1849         data->cancelled = 0;
1850         data->is_recover = 0;
1851         if (isrecover) {
1852                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1853                 data->is_recover = 1;
1854         }
1855         task = rpc_run_task(&task_setup_data);
1856         if (IS_ERR(task))
1857                 return PTR_ERR(task);
1858         status = nfs4_wait_for_completion_rpc_task(task);
1859         if (status != 0) {
1860                 data->cancelled = 1;
1861                 smp_wmb();
1862         } else
1863                 status = data->rpc_status;
1864         rpc_put_task(task);
1865
1866         return status;
1867 }
1868
1869 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1870 {
1871         struct inode *dir = data->dir->d_inode;
1872         struct nfs_openres *o_res = &data->o_res;
1873         int status;
1874
1875         status = nfs4_run_open_task(data, 1);
1876         if (status != 0 || !data->rpc_done)
1877                 return status;
1878
1879         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1880
1881         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1882                 status = _nfs4_proc_open_confirm(data);
1883                 if (status != 0)
1884                         return status;
1885         }
1886
1887         return status;
1888 }
1889
1890 static int nfs4_opendata_access(struct rpc_cred *cred,
1891                                 struct nfs4_opendata *opendata,
1892                                 struct nfs4_state *state, fmode_t fmode,
1893                                 int openflags)
1894 {
1895         struct nfs_access_entry cache;
1896         u32 mask;
1897
1898         /* access call failed or for some reason the server doesn't
1899          * support any access modes -- defer access call until later */
1900         if (opendata->o_res.access_supported == 0)
1901                 return 0;
1902
1903         mask = 0;
1904         /* don't check MAY_WRITE - a newly created file may not have
1905          * write mode bits, but POSIX allows the creating process to write.
1906          * use openflags to check for exec, because fmode won't
1907          * always have FMODE_EXEC set when file open for exec. */
1908         if (openflags & __FMODE_EXEC) {
1909                 /* ONLY check for exec rights */
1910                 mask = MAY_EXEC;
1911         } else if (fmode & FMODE_READ)
1912                 mask = MAY_READ;
1913
1914         cache.cred = cred;
1915         cache.jiffies = jiffies;
1916         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1917         nfs_access_add_cache(state->inode, &cache);
1918
1919         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1920                 return 0;
1921
1922         /* even though OPEN succeeded, access is denied. Close the file */
1923         nfs4_close_state(state, fmode);
1924         return -EACCES;
1925 }
1926
1927 /*
1928  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1929  */
1930 static int _nfs4_proc_open(struct nfs4_opendata *data)
1931 {
1932         struct inode *dir = data->dir->d_inode;
1933         struct nfs_server *server = NFS_SERVER(dir);
1934         struct nfs_openargs *o_arg = &data->o_arg;
1935         struct nfs_openres *o_res = &data->o_res;
1936         int status;
1937
1938         status = nfs4_run_open_task(data, 0);
1939         if (!data->rpc_done)
1940                 return status;
1941         if (status != 0) {
1942                 if (status == -NFS4ERR_BADNAME &&
1943                                 !(o_arg->open_flags & O_CREAT))
1944                         return -ENOENT;
1945                 return status;
1946         }
1947
1948         nfs_fattr_map_and_free_names(server, &data->f_attr);
1949
1950         if (o_arg->open_flags & O_CREAT) {
1951                 update_changeattr(dir, &o_res->cinfo);
1952                 if (o_arg->open_flags & O_EXCL)
1953                         data->file_created = 1;
1954                 else if (o_res->cinfo.before != o_res->cinfo.after)
1955                         data->file_created = 1;
1956         }
1957         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1958                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1959         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1960                 status = _nfs4_proc_open_confirm(data);
1961                 if (status != 0)
1962                         return status;
1963         }
1964         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1965                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1966         return 0;
1967 }
1968
1969 static int nfs4_recover_expired_lease(struct nfs_server *server)
1970 {
1971         return nfs4_client_recover_expired_lease(server->nfs_client);
1972 }
1973
1974 /*
1975  * OPEN_EXPIRED:
1976  *      reclaim state on the server after a network partition.
1977  *      Assumes caller holds the appropriate lock
1978  */
1979 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1980 {
1981         struct nfs4_opendata *opendata;
1982         int ret;
1983
1984         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1985                         NFS4_OPEN_CLAIM_FH);
1986         if (IS_ERR(opendata))
1987                 return PTR_ERR(opendata);
1988         ret = nfs4_open_recover(opendata, state);
1989         if (ret == -ESTALE)
1990                 d_drop(ctx->dentry);
1991         nfs4_opendata_put(opendata);
1992         return ret;
1993 }
1994
1995 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1996 {
1997         struct nfs_server *server = NFS_SERVER(state->inode);
1998         struct nfs4_exception exception = { };
1999         int err;
2000
2001         do {
2002                 err = _nfs4_open_expired(ctx, state);
2003                 trace_nfs4_open_expired(ctx, 0, err);
2004                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2005                         continue;
2006                 switch (err) {
2007                 default:
2008                         goto out;
2009                 case -NFS4ERR_GRACE:
2010                 case -NFS4ERR_DELAY:
2011                         nfs4_handle_exception(server, err, &exception);
2012                         err = 0;
2013                 }
2014         } while (exception.retry);
2015 out:
2016         return err;
2017 }
2018
2019 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2020 {
2021         struct nfs_open_context *ctx;
2022         int ret;
2023
2024         ctx = nfs4_state_find_open_context(state);
2025         if (IS_ERR(ctx))
2026                 return -EAGAIN;
2027         ret = nfs4_do_open_expired(ctx, state);
2028         put_nfs_open_context(ctx);
2029         return ret;
2030 }
2031
2032 #if defined(CONFIG_NFS_V4_1)
2033 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2034 {
2035         struct nfs_server *server = NFS_SERVER(state->inode);
2036         nfs4_stateid *stateid = &state->stateid;
2037         struct nfs_delegation *delegation;
2038         struct rpc_cred *cred = NULL;
2039         int status = -NFS4ERR_BAD_STATEID;
2040
2041         /* If a state reset has been done, test_stateid is unneeded */
2042         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2043                 return;
2044
2045         /* Get the delegation credential for use by test/free_stateid */
2046         rcu_read_lock();
2047         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2048         if (delegation != NULL &&
2049             nfs4_stateid_match(&delegation->stateid, stateid)) {
2050                 cred = get_rpccred(delegation->cred);
2051                 rcu_read_unlock();
2052                 status = nfs41_test_stateid(server, stateid, cred);
2053                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2054         } else
2055                 rcu_read_unlock();
2056
2057         if (status != NFS_OK) {
2058                 /* Free the stateid unless the server explicitly
2059                  * informs us the stateid is unrecognized. */
2060                 if (status != -NFS4ERR_BAD_STATEID)
2061                         nfs41_free_stateid(server, stateid, cred);
2062                 nfs_remove_bad_delegation(state->inode);
2063
2064                 write_seqlock(&state->seqlock);
2065                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2066                 write_sequnlock(&state->seqlock);
2067                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2068         }
2069
2070         if (cred != NULL)
2071                 put_rpccred(cred);
2072 }
2073
2074 /**
2075  * nfs41_check_open_stateid - possibly free an open stateid
2076  *
2077  * @state: NFSv4 state for an inode
2078  *
2079  * Returns NFS_OK if recovery for this stateid is now finished.
2080  * Otherwise a negative NFS4ERR value is returned.
2081  */
2082 static int nfs41_check_open_stateid(struct nfs4_state *state)
2083 {
2084         struct nfs_server *server = NFS_SERVER(state->inode);
2085         nfs4_stateid *stateid = &state->open_stateid;
2086         struct rpc_cred *cred = state->owner->so_cred;
2087         int status;
2088
2089         /* If a state reset has been done, test_stateid is unneeded */
2090         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2091             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2092             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2093                 return -NFS4ERR_BAD_STATEID;
2094
2095         status = nfs41_test_stateid(server, stateid, cred);
2096         trace_nfs4_test_open_stateid(state, NULL, status);
2097         if (status != NFS_OK) {
2098                 /* Free the stateid unless the server explicitly
2099                  * informs us the stateid is unrecognized. */
2100                 if (status != -NFS4ERR_BAD_STATEID)
2101                         nfs41_free_stateid(server, stateid, cred);
2102
2103                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2104                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2105                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2106                 clear_bit(NFS_OPEN_STATE, &state->flags);
2107         }
2108         return status;
2109 }
2110
2111 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2112 {
2113         int status;
2114
2115         nfs41_clear_delegation_stateid(state);
2116         status = nfs41_check_open_stateid(state);
2117         if (status != NFS_OK)
2118                 status = nfs4_open_expired(sp, state);
2119         return status;
2120 }
2121 #endif
2122
2123 /*
2124  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2125  * fields corresponding to attributes that were used to store the verifier.
2126  * Make sure we clobber those fields in the later setattr call
2127  */
2128 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2129 {
2130         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2131             !(sattr->ia_valid & ATTR_ATIME_SET))
2132                 sattr->ia_valid |= ATTR_ATIME;
2133
2134         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2135             !(sattr->ia_valid & ATTR_MTIME_SET))
2136                 sattr->ia_valid |= ATTR_MTIME;
2137 }
2138
2139 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2140                 fmode_t fmode,
2141                 int flags,
2142                 struct nfs_open_context *ctx)
2143 {
2144         struct nfs4_state_owner *sp = opendata->owner;
2145         struct nfs_server *server = sp->so_server;
2146         struct dentry *dentry;
2147         struct nfs4_state *state;
2148         unsigned int seq;
2149         int ret;
2150
2151         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2152
2153         ret = _nfs4_proc_open(opendata);
2154         if (ret != 0)
2155                 goto out;
2156
2157         state = nfs4_opendata_to_nfs4_state(opendata);
2158         ret = PTR_ERR(state);
2159         if (IS_ERR(state))
2160                 goto out;
2161         if (server->caps & NFS_CAP_POSIX_LOCK)
2162                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2163
2164         dentry = opendata->dentry;
2165         if (dentry->d_inode == NULL) {
2166                 /* FIXME: Is this d_drop() ever needed? */
2167                 d_drop(dentry);
2168                 dentry = d_add_unique(dentry, igrab(state->inode));
2169                 if (dentry == NULL) {
2170                         dentry = opendata->dentry;
2171                 } else if (dentry != ctx->dentry) {
2172                         dput(ctx->dentry);
2173                         ctx->dentry = dget(dentry);
2174                 }
2175                 nfs_set_verifier(dentry,
2176                                 nfs_save_change_attribute(opendata->dir->d_inode));
2177         }
2178
2179         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2180         if (ret != 0)
2181                 goto out;
2182
2183         ctx->state = state;
2184         if (dentry->d_inode == state->inode) {
2185                 nfs_inode_attach_open_context(ctx);
2186                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2187                         nfs4_schedule_stateid_recovery(server, state);
2188         }
2189 out:
2190         return ret;
2191 }
2192
2193 /*
2194  * Returns a referenced nfs4_state
2195  */
2196 static int _nfs4_do_open(struct inode *dir,
2197                         struct nfs_open_context *ctx,
2198                         int flags,
2199                         struct iattr *sattr,
2200                         struct nfs4_label *label,
2201                         int *opened)
2202 {
2203         struct nfs4_state_owner  *sp;
2204         struct nfs4_state     *state = NULL;
2205         struct nfs_server       *server = NFS_SERVER(dir);
2206         struct nfs4_opendata *opendata;
2207         struct dentry *dentry = ctx->dentry;
2208         struct rpc_cred *cred = ctx->cred;
2209         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2210         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2211         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2212         struct nfs4_label *olabel = NULL;
2213         int status;
2214
2215         /* Protect against reboot recovery conflicts */
2216         status = -ENOMEM;
2217         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2218         if (sp == NULL) {
2219                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2220                 goto out_err;
2221         }
2222         status = nfs4_recover_expired_lease(server);
2223         if (status != 0)
2224                 goto err_put_state_owner;
2225         if (dentry->d_inode != NULL)
2226                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2227         status = -ENOMEM;
2228         if (dentry->d_inode)
2229                 claim = NFS4_OPEN_CLAIM_FH;
2230         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2231                         label, claim, GFP_KERNEL);
2232         if (opendata == NULL)
2233                 goto err_put_state_owner;
2234
2235         if (label) {
2236                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2237                 if (IS_ERR(olabel)) {
2238                         status = PTR_ERR(olabel);
2239                         goto err_opendata_put;
2240                 }
2241         }
2242
2243         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2244                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2245                 if (!opendata->f_attr.mdsthreshold)
2246                         goto err_free_label;
2247                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2248         }
2249         if (dentry->d_inode != NULL)
2250                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2251
2252         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2253         if (status != 0)
2254                 goto err_free_label;
2255         state = ctx->state;
2256
2257         if ((opendata->o_arg.open_flags & O_EXCL) &&
2258             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2259                 nfs4_exclusive_attrset(opendata, sattr);
2260
2261                 nfs_fattr_init(opendata->o_res.f_attr);
2262                 status = nfs4_do_setattr(state->inode, cred,
2263                                 opendata->o_res.f_attr, sattr,
2264                                 state, label, olabel);
2265                 if (status == 0) {
2266                         nfs_setattr_update_inode(state->inode, sattr);
2267                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2268                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2269                 }
2270         }
2271         if (opendata->file_created)
2272                 *opened |= FILE_CREATED;
2273
2274         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2275                 *ctx_th = opendata->f_attr.mdsthreshold;
2276         else
2277                 kfree(opendata->f_attr.mdsthreshold);
2278         opendata->f_attr.mdsthreshold = NULL;
2279
2280         nfs4_label_free(olabel);
2281
2282         nfs4_opendata_put(opendata);
2283         nfs4_put_state_owner(sp);
2284         return 0;
2285 err_free_label:
2286         nfs4_label_free(olabel);
2287 err_opendata_put:
2288         kfree(opendata->f_attr.mdsthreshold);
2289         nfs4_opendata_put(opendata);
2290 err_put_state_owner:
2291         nfs4_put_state_owner(sp);
2292 out_err:
2293         return status;
2294 }
2295
2296
2297 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2298                                         struct nfs_open_context *ctx,
2299                                         int flags,
2300                                         struct iattr *sattr,
2301                                         struct nfs4_label *label,
2302                                         int *opened)
2303 {
2304         struct nfs_server *server = NFS_SERVER(dir);
2305         struct nfs4_exception exception = { };
2306         struct nfs4_state *res;
2307         int status;
2308
2309         do {
2310                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2311                 res = ctx->state;
2312                 trace_nfs4_open_file(ctx, flags, status);
2313                 if (status == 0)
2314                         break;
2315                 /* NOTE: BAD_SEQID means the server and client disagree about the
2316                  * book-keeping w.r.t. state-changing operations
2317                  * (OPEN/CLOSE/LOCK/LOCKU...)
2318                  * It is actually a sign of a bug on the client or on the server.
2319                  *
2320                  * If we receive a BAD_SEQID error in the particular case of
2321                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2322                  * have unhashed the old state_owner for us, and that we can
2323                  * therefore safely retry using a new one. We should still warn
2324                  * the user though...
2325                  */
2326                 if (status == -NFS4ERR_BAD_SEQID) {
2327                         pr_warn_ratelimited("NFS: v4 server %s "
2328                                         " returned a bad sequence-id error!\n",
2329                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2330                         exception.retry = 1;
2331                         continue;
2332                 }
2333                 /*
2334                  * BAD_STATEID on OPEN means that the server cancelled our
2335                  * state before it received the OPEN_CONFIRM.
2336                  * Recover by retrying the request as per the discussion
2337                  * on Page 181 of RFC3530.
2338                  */
2339                 if (status == -NFS4ERR_BAD_STATEID) {
2340                         exception.retry = 1;
2341                         continue;
2342                 }
2343                 if (status == -EAGAIN) {
2344                         /* We must have found a delegation */
2345                         exception.retry = 1;
2346                         continue;
2347                 }
2348                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2349                         continue;
2350                 res = ERR_PTR(nfs4_handle_exception(server,
2351                                         status, &exception));
2352         } while (exception.retry);
2353         return res;
2354 }
2355
2356 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2357                             struct nfs_fattr *fattr, struct iattr *sattr,
2358                             struct nfs4_state *state, struct nfs4_label *ilabel,
2359                             struct nfs4_label *olabel)
2360 {
2361         struct nfs_server *server = NFS_SERVER(inode);
2362         struct nfs_setattrargs  arg = {
2363                 .fh             = NFS_FH(inode),
2364                 .iap            = sattr,
2365                 .server         = server,
2366                 .bitmask = server->attr_bitmask,
2367                 .label          = ilabel,
2368         };
2369         struct nfs_setattrres  res = {
2370                 .fattr          = fattr,
2371                 .label          = olabel,
2372                 .server         = server,
2373         };
2374         struct rpc_message msg = {
2375                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2376                 .rpc_argp       = &arg,
2377                 .rpc_resp       = &res,
2378                 .rpc_cred       = cred,
2379         };
2380         unsigned long timestamp = jiffies;
2381         fmode_t fmode;
2382         bool truncate;
2383         int status;
2384
2385         arg.bitmask = nfs4_bitmask(server, ilabel);
2386         if (ilabel)
2387                 arg.bitmask = nfs4_bitmask(server, olabel);
2388
2389         nfs_fattr_init(fattr);
2390
2391         /* Servers should only apply open mode checks for file size changes */
2392         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2393         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2394
2395         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2396                 /* Use that stateid */
2397         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2398                 struct nfs_lockowner lockowner = {
2399                         .l_owner = current->files,
2400                         .l_pid = current->tgid,
2401                 };
2402                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2403                                 &lockowner);
2404         } else
2405                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2406
2407         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2408         if (status == 0 && state != NULL)
2409                 renew_lease(server, timestamp);
2410         return status;
2411 }
2412
2413 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2414                            struct nfs_fattr *fattr, struct iattr *sattr,
2415                            struct nfs4_state *state, struct nfs4_label *ilabel,
2416                            struct nfs4_label *olabel)
2417 {
2418         struct nfs_server *server = NFS_SERVER(inode);
2419         struct nfs4_exception exception = {
2420                 .state = state,
2421                 .inode = inode,
2422         };
2423         int err;
2424         do {
2425                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2426                 trace_nfs4_setattr(inode, err);
2427                 switch (err) {
2428                 case -NFS4ERR_OPENMODE:
2429                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2430                                 pr_warn_once("NFSv4: server %s is incorrectly "
2431                                                 "applying open mode checks to "
2432                                                 "a SETATTR that is not "
2433                                                 "changing file size.\n",
2434                                                 server->nfs_client->cl_hostname);
2435                         }
2436                         if (state && !(state->state & FMODE_WRITE)) {
2437                                 err = -EBADF;
2438                                 if (sattr->ia_valid & ATTR_OPEN)
2439                                         err = -EACCES;
2440                                 goto out;
2441                         }
2442                 }
2443                 err = nfs4_handle_exception(server, err, &exception);
2444         } while (exception.retry);
2445 out:
2446         return err;
2447 }
2448
2449 struct nfs4_closedata {
2450         struct inode *inode;
2451         struct nfs4_state *state;
2452         struct nfs_closeargs arg;
2453         struct nfs_closeres res;
2454         struct nfs_fattr fattr;
2455         unsigned long timestamp;
2456         bool roc;
2457         u32 roc_barrier;
2458 };
2459
2460 static void nfs4_free_closedata(void *data)
2461 {
2462         struct nfs4_closedata *calldata = data;
2463         struct nfs4_state_owner *sp = calldata->state->owner;
2464         struct super_block *sb = calldata->state->inode->i_sb;
2465
2466         if (calldata->roc)
2467                 pnfs_roc_release(calldata->state->inode);
2468         nfs4_put_open_state(calldata->state);
2469         nfs_free_seqid(calldata->arg.seqid);
2470         nfs4_put_state_owner(sp);
2471         nfs_sb_deactive(sb);
2472         kfree(calldata);
2473 }
2474
2475 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2476                 fmode_t fmode)
2477 {
2478         spin_lock(&state->owner->so_lock);
2479         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2480         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2481         case FMODE_WRITE:
2482                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2483                 break;
2484         case FMODE_READ:
2485                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2486                 break;
2487         case 0:
2488                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2489                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2490                 clear_bit(NFS_OPEN_STATE, &state->flags);
2491         }
2492         spin_unlock(&state->owner->so_lock);
2493 }
2494
2495 static void nfs4_close_done(struct rpc_task *task, void *data)
2496 {
2497         struct nfs4_closedata *calldata = data;
2498         struct nfs4_state *state = calldata->state;
2499         struct nfs_server *server = NFS_SERVER(calldata->inode);
2500
2501         dprintk("%s: begin!\n", __func__);
2502         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2503                 return;
2504         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2505         /* hmm. we are done with the inode, and in the process of freeing
2506          * the state_owner. we keep this around to process errors
2507          */
2508         switch (task->tk_status) {
2509                 case 0:
2510                         if (calldata->roc)
2511                                 pnfs_roc_set_barrier(state->inode,
2512                                                      calldata->roc_barrier);
2513                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2514                         renew_lease(server, calldata->timestamp);
2515                         nfs4_close_clear_stateid_flags(state,
2516                                         calldata->arg.fmode);
2517                         break;
2518                 case -NFS4ERR_STALE_STATEID:
2519                 case -NFS4ERR_OLD_STATEID:
2520                 case -NFS4ERR_BAD_STATEID:
2521                 case -NFS4ERR_EXPIRED:
2522                         if (calldata->arg.fmode == 0)
2523                                 break;
2524                 default:
2525                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2526                                 rpc_restart_call_prepare(task);
2527         }
2528         nfs_release_seqid(calldata->arg.seqid);
2529         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2530         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2531 }
2532
2533 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2534 {
2535         struct nfs4_closedata *calldata = data;
2536         struct nfs4_state *state = calldata->state;
2537         struct inode *inode = calldata->inode;
2538         int call_close = 0;
2539
2540         dprintk("%s: begin!\n", __func__);
2541         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2542                 goto out_wait;
2543
2544         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2545         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2546         spin_lock(&state->owner->so_lock);
2547         /* Calculate the change in open mode */
2548         if (state->n_rdwr == 0) {
2549                 if (state->n_rdonly == 0) {
2550                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2551                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2552                         calldata->arg.fmode &= ~FMODE_READ;
2553                 }
2554                 if (state->n_wronly == 0) {
2555                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2556                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2557                         calldata->arg.fmode &= ~FMODE_WRITE;
2558                 }
2559         }
2560         if (!nfs4_valid_open_stateid(state))
2561                 call_close = 0;
2562         spin_unlock(&state->owner->so_lock);
2563
2564         if (!call_close) {
2565                 /* Note: exit _without_ calling nfs4_close_done */
2566                 goto out_no_action;
2567         }
2568
2569         if (calldata->arg.fmode == 0) {
2570                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2571                 if (calldata->roc &&
2572                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2573                         nfs_release_seqid(calldata->arg.seqid);
2574                         goto out_wait;
2575                     }
2576         }
2577
2578         nfs_fattr_init(calldata->res.fattr);
2579         calldata->timestamp = jiffies;
2580         if (nfs4_setup_sequence(NFS_SERVER(inode),
2581                                 &calldata->arg.seq_args,
2582                                 &calldata->res.seq_res,
2583                                 task) != 0)
2584                 nfs_release_seqid(calldata->arg.seqid);
2585         dprintk("%s: done!\n", __func__);
2586         return;
2587 out_no_action:
2588         task->tk_action = NULL;
2589 out_wait:
2590         nfs4_sequence_done(task, &calldata->res.seq_res);
2591 }
2592
2593 static const struct rpc_call_ops nfs4_close_ops = {
2594         .rpc_call_prepare = nfs4_close_prepare,
2595         .rpc_call_done = nfs4_close_done,
2596         .rpc_release = nfs4_free_closedata,
2597 };
2598
2599 /*
2600  * It is possible for data to be read/written from a mem-mapped file
2601  * after the sys_close call (which hits the vfs layer as a flush).
2602  * This means that we can't safely call nfsv4 close on a file until
2603  * the inode is cleared. This in turn means that we are not good
2604  * NFSv4 citizens - we do not indicate to the server to update the file's
2605  * share state even when we are done with one of the three share
2606  * stateid's in the inode.
2607  *
2608  * NOTE: Caller must be holding the sp->so_owner semaphore!
2609  */
2610 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2611 {
2612         struct nfs_server *server = NFS_SERVER(state->inode);
2613         struct nfs4_closedata *calldata;
2614         struct nfs4_state_owner *sp = state->owner;
2615         struct rpc_task *task;
2616         struct rpc_message msg = {
2617                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2618                 .rpc_cred = state->owner->so_cred,
2619         };
2620         struct rpc_task_setup task_setup_data = {
2621                 .rpc_client = server->client,
2622                 .rpc_message = &msg,
2623                 .callback_ops = &nfs4_close_ops,
2624                 .workqueue = nfsiod_workqueue,
2625                 .flags = RPC_TASK_ASYNC,
2626         };
2627         int status = -ENOMEM;
2628
2629         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2630                 &task_setup_data.rpc_client, &msg);
2631
2632         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2633         if (calldata == NULL)
2634                 goto out;
2635         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2636         calldata->inode = state->inode;
2637         calldata->state = state;
2638         calldata->arg.fh = NFS_FH(state->inode);
2639         calldata->arg.stateid = &state->open_stateid;
2640         /* Serialization for the sequence id */
2641         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2642         if (calldata->arg.seqid == NULL)
2643                 goto out_free_calldata;
2644         calldata->arg.fmode = 0;
2645         calldata->arg.bitmask = server->cache_consistency_bitmask;
2646         calldata->res.fattr = &calldata->fattr;
2647         calldata->res.seqid = calldata->arg.seqid;
2648         calldata->res.server = server;
2649         calldata->roc = pnfs_roc(state->inode);
2650         nfs_sb_active(calldata->inode->i_sb);
2651
2652         msg.rpc_argp = &calldata->arg;
2653         msg.rpc_resp = &calldata->res;
2654         task_setup_data.callback_data = calldata;
2655         task = rpc_run_task(&task_setup_data);
2656         if (IS_ERR(task))
2657                 return PTR_ERR(task);
2658         status = 0;
2659         if (wait)
2660                 status = rpc_wait_for_completion_task(task);
2661         rpc_put_task(task);
2662         return status;
2663 out_free_calldata:
2664         kfree(calldata);
2665 out:
2666         nfs4_put_open_state(state);
2667         nfs4_put_state_owner(sp);
2668         return status;
2669 }
2670
2671 static struct inode *
2672 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2673                 int open_flags, struct iattr *attr, int *opened)
2674 {
2675         struct nfs4_state *state;
2676         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2677
2678         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2679
2680         /* Protect against concurrent sillydeletes */
2681         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2682
2683         nfs4_label_release_security(label);
2684
2685         if (IS_ERR(state))
2686                 return ERR_CAST(state);
2687         return state->inode;
2688 }
2689
2690 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2691 {
2692         if (ctx->state == NULL)
2693                 return;
2694         if (is_sync)
2695                 nfs4_close_sync(ctx->state, ctx->mode);
2696         else
2697                 nfs4_close_state(ctx->state, ctx->mode);
2698 }
2699
2700 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2701 {
2702         struct nfs4_server_caps_arg args = {
2703                 .fhandle = fhandle,
2704         };
2705         struct nfs4_server_caps_res res = {};
2706         struct rpc_message msg = {
2707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2708                 .rpc_argp = &args,
2709                 .rpc_resp = &res,
2710         };
2711         int status;
2712
2713         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2714         if (status == 0) {
2715                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2716                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2717                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2718                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2719                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2720                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2721                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2722                         server->caps |= NFS_CAP_ACLS;
2723                 if (res.has_links != 0)
2724                         server->caps |= NFS_CAP_HARDLINKS;
2725                 if (res.has_symlinks != 0)
2726                         server->caps |= NFS_CAP_SYMLINKS;
2727                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2728                         server->caps |= NFS_CAP_FILEID;
2729                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2730                         server->caps |= NFS_CAP_MODE;
2731                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2732                         server->caps |= NFS_CAP_NLINK;
2733                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2734                         server->caps |= NFS_CAP_OWNER;
2735                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2736                         server->caps |= NFS_CAP_OWNER_GROUP;
2737                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2738                         server->caps |= NFS_CAP_ATIME;
2739                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2740                         server->caps |= NFS_CAP_CTIME;
2741                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2742                         server->caps |= NFS_CAP_MTIME;
2743 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2744                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2745                         server->caps |= NFS_CAP_SECURITY_LABEL;
2746 #endif
2747                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2748                                 sizeof(server->attr_bitmask));
2749
2750                 if (server->caps & NFS_CAP_SECURITY_LABEL) {
2751                         server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2752                         res.attr_bitmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2753                 }
2754                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2755                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2756                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2757                 server->acl_bitmask = res.acl_bitmask;
2758                 server->fh_expire_type = res.fh_expire_type;
2759         }
2760
2761         return status;
2762 }
2763
2764 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2765 {
2766         struct nfs4_exception exception = { };
2767         int err;
2768         do {
2769                 err = nfs4_handle_exception(server,
2770                                 _nfs4_server_capabilities(server, fhandle),
2771                                 &exception);
2772         } while (exception.retry);
2773         return err;
2774 }
2775
2776 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2777                 struct nfs_fsinfo *info)
2778 {
2779         u32 bitmask[3];
2780         struct nfs4_lookup_root_arg args = {
2781                 .bitmask = bitmask,
2782         };
2783         struct nfs4_lookup_res res = {
2784                 .server = server,
2785                 .fattr = info->fattr,
2786                 .fh = fhandle,
2787         };
2788         struct rpc_message msg = {
2789                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2790                 .rpc_argp = &args,
2791                 .rpc_resp = &res,
2792         };
2793
2794         bitmask[0] = nfs4_fattr_bitmap[0];
2795         bitmask[1] = nfs4_fattr_bitmap[1];
2796         /*
2797          * Process the label in the upcoming getfattr
2798          */
2799         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2800
2801         nfs_fattr_init(info->fattr);
2802         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2803 }
2804
2805 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2806                 struct nfs_fsinfo *info)
2807 {
2808         struct nfs4_exception exception = { };
2809         int err;
2810         do {
2811                 err = _nfs4_lookup_root(server, fhandle, info);
2812                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2813                 switch (err) {
2814                 case 0:
2815                 case -NFS4ERR_WRONGSEC:
2816                         goto out;
2817                 default:
2818                         err = nfs4_handle_exception(server, err, &exception);
2819                 }
2820         } while (exception.retry);
2821 out:
2822         return err;
2823 }
2824
2825 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2826                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2827 {
2828         struct rpc_auth_create_args auth_args = {
2829                 .pseudoflavor = flavor,
2830         };
2831         struct rpc_auth *auth;
2832         int ret;
2833
2834         auth = rpcauth_create(&auth_args, server->client);
2835         if (IS_ERR(auth)) {
2836                 ret = -EACCES;
2837                 goto out;
2838         }
2839         ret = nfs4_lookup_root(server, fhandle, info);
2840 out:
2841         return ret;
2842 }
2843
2844 /*
2845  * Retry pseudoroot lookup with various security flavors.  We do this when:
2846  *
2847  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2848  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2849  *
2850  * Returns zero on success, or a negative NFS4ERR value, or a
2851  * negative errno value.
2852  */
2853 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2854                               struct nfs_fsinfo *info)
2855 {
2856         /* Per 3530bis 15.33.5 */
2857         static const rpc_authflavor_t flav_array[] = {
2858                 RPC_AUTH_GSS_KRB5P,
2859                 RPC_AUTH_GSS_KRB5I,
2860                 RPC_AUTH_GSS_KRB5,
2861                 RPC_AUTH_UNIX,                  /* courtesy */
2862                 RPC_AUTH_NULL,
2863         };
2864         int status = -EPERM;
2865         size_t i;
2866
2867         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2868                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2869                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2870                         continue;
2871                 break;
2872         }
2873
2874         /*
2875          * -EACCESS could mean that the user doesn't have correct permissions
2876          * to access the mount.  It could also mean that we tried to mount
2877          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2878          * existing mount programs don't handle -EACCES very well so it should
2879          * be mapped to -EPERM instead.
2880          */
2881         if (status == -EACCES)
2882                 status = -EPERM;
2883         return status;
2884 }
2885
2886 static int nfs4_do_find_root_sec(struct nfs_server *server,
2887                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2888 {
2889         int mv = server->nfs_client->cl_minorversion;
2890         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2891 }
2892
2893 /**
2894  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2895  * @server: initialized nfs_server handle
2896  * @fhandle: we fill in the pseudo-fs root file handle
2897  * @info: we fill in an FSINFO struct
2898  * @auth_probe: probe the auth flavours
2899  *
2900  * Returns zero on success, or a negative errno.
2901  */
2902 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2903                          struct nfs_fsinfo *info,
2904                          bool auth_probe)
2905 {
2906         int status;
2907
2908         switch (auth_probe) {
2909         case false:
2910                 status = nfs4_lookup_root(server, fhandle, info);
2911                 if (status != -NFS4ERR_WRONGSEC)
2912                         break;
2913                 /* Did user force a 'sec=' mount option? */
2914                 if (server->flags & NFS_MOUNT_SECFLAVOUR)
2915                         break;
2916         default:
2917                 status = nfs4_do_find_root_sec(server, fhandle, info);
2918         }
2919
2920         if (status == 0)
2921                 status = nfs4_server_capabilities(server, fhandle);
2922         if (status == 0)
2923                 status = nfs4_do_fsinfo(server, fhandle, info);
2924
2925         return nfs4_map_errors(status);
2926 }
2927
2928 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2929                               struct nfs_fsinfo *info)
2930 {
2931         int error;
2932         struct nfs_fattr *fattr = info->fattr;
2933         struct nfs4_label *label = NULL;
2934
2935         error = nfs4_server_capabilities(server, mntfh);
2936         if (error < 0) {
2937                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2938                 return error;
2939         }
2940
2941         label = nfs4_label_alloc(server, GFP_KERNEL);
2942         if (IS_ERR(label))
2943                 return PTR_ERR(label);
2944
2945         error = nfs4_proc_getattr(server, mntfh, fattr, label);
2946         if (error < 0) {
2947                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2948                 goto err_free_label;
2949         }
2950
2951         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2952             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2953                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2954
2955 err_free_label:
2956         nfs4_label_free(label);
2957
2958         return error;
2959 }
2960
2961 /*
2962  * Get locations and (maybe) other attributes of a referral.
2963  * Note that we'll actually follow the referral later when
2964  * we detect fsid mismatch in inode revalidation
2965  */
2966 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2967                              const struct qstr *name, struct nfs_fattr *fattr,
2968                              struct nfs_fh *fhandle)
2969 {
2970         int status = -ENOMEM;
2971         struct page *page = NULL;
2972         struct nfs4_fs_locations *locations = NULL;
2973
2974         page = alloc_page(GFP_KERNEL);
2975         if (page == NULL)
2976                 goto out;
2977         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2978         if (locations == NULL)
2979                 goto out;
2980
2981         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2982         if (status != 0)
2983                 goto out;
2984
2985         /*
2986          * If the fsid didn't change, this is a migration event, not a
2987          * referral.  Cause us to drop into the exception handler, which
2988          * will kick off migration recovery.
2989          */
2990         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2991                 dprintk("%s: server did not return a different fsid for"
2992                         " a referral at %s\n", __func__, name->name);
2993                 status = -NFS4ERR_MOVED;
2994                 goto out;
2995         }
2996         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2997         nfs_fixup_referral_attributes(&locations->fattr);
2998
2999         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3000         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3001         memset(fhandle, 0, sizeof(struct nfs_fh));
3002 out:
3003         if (page)
3004                 __free_page(page);
3005         kfree(locations);
3006         return status;
3007 }
3008
3009 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3010                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3011 {
3012         struct nfs4_getattr_arg args = {
3013                 .fh = fhandle,
3014                 .bitmask = server->attr_bitmask,
3015         };
3016         struct nfs4_getattr_res res = {
3017                 .fattr = fattr,
3018                 .label = label,
3019                 .server = server,
3020         };
3021         struct rpc_message msg = {
3022                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3023                 .rpc_argp = &args,
3024                 .rpc_resp = &res,
3025         };
3026
3027         args.bitmask = nfs4_bitmask(server, label);
3028
3029         nfs_fattr_init(fattr);
3030         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3031 }
3032
3033 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3034                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3035 {
3036         struct nfs4_exception exception = { };
3037         int err;
3038         do {
3039                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3040                 trace_nfs4_getattr(server, fhandle, fattr, err);
3041                 err = nfs4_handle_exception(server, err,
3042                                 &exception);
3043         } while (exception.retry);
3044         return err;
3045 }
3046
3047 /*
3048  * The file is not closed if it is opened due to the a request to change
3049  * the size of the file. The open call will not be needed once the
3050  * VFS layer lookup-intents are implemented.
3051  *
3052  * Close is called when the inode is destroyed.
3053  * If we haven't opened the file for O_WRONLY, we
3054  * need to in the size_change case to obtain a stateid.
3055  *
3056  * Got race?
3057  * Because OPEN is always done by name in nfsv4, it is
3058  * possible that we opened a different file by the same
3059  * name.  We can recognize this race condition, but we
3060  * can't do anything about it besides returning an error.
3061  *
3062  * This will be fixed with VFS changes (lookup-intent).
3063  */
3064 static int
3065 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3066                   struct iattr *sattr)
3067 {
3068         struct inode *inode = dentry->d_inode;
3069         struct rpc_cred *cred = NULL;
3070         struct nfs4_state *state = NULL;
3071         struct nfs4_label *label = NULL;
3072         int status;
3073
3074         if (pnfs_ld_layoutret_on_setattr(inode))
3075                 pnfs_commit_and_return_layout(inode);
3076
3077         nfs_fattr_init(fattr);
3078
3079         /* Deal with open(O_TRUNC) */
3080         if (sattr->ia_valid & ATTR_OPEN)
3081                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3082
3083         /* Optimization: if the end result is no change, don't RPC */
3084         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3085                 return 0;
3086
3087         /* Search for an existing open(O_WRITE) file */
3088         if (sattr->ia_valid & ATTR_FILE) {
3089                 struct nfs_open_context *ctx;
3090
3091                 ctx = nfs_file_open_context(sattr->ia_file);
3092                 if (ctx) {
3093                         cred = ctx->cred;
3094                         state = ctx->state;
3095                 }
3096         }
3097
3098         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3099         if (IS_ERR(label))
3100                 return PTR_ERR(label);
3101
3102         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3103         if (status == 0) {
3104                 nfs_setattr_update_inode(inode, sattr);
3105                 nfs_setsecurity(inode, fattr, label);
3106         }
3107         nfs4_label_free(label);
3108         return status;
3109 }
3110
3111 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3112                 const struct qstr *name, struct nfs_fh *fhandle,
3113                 struct nfs_fattr *fattr, struct nfs4_label *label)
3114 {
3115         struct nfs_server *server = NFS_SERVER(dir);
3116         int                    status;
3117         struct nfs4_lookup_arg args = {
3118                 .bitmask = server->attr_bitmask,
3119                 .dir_fh = NFS_FH(dir),
3120                 .name = name,
3121         };
3122         struct nfs4_lookup_res res = {
3123                 .server = server,
3124                 .fattr = fattr,
3125                 .label = label,
3126                 .fh = fhandle,
3127         };
3128         struct rpc_message msg = {
3129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3130                 .rpc_argp = &args,
3131                 .rpc_resp = &res,
3132         };
3133
3134         args.bitmask = nfs4_bitmask(server, label);
3135
3136         nfs_fattr_init(fattr);
3137
3138         dprintk("NFS call  lookup %s\n", name->name);
3139         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3140         dprintk("NFS reply lookup: %d\n", status);
3141         return status;
3142 }
3143
3144 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3145 {
3146         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3147                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3148         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3149         fattr->nlink = 2;
3150 }
3151
3152 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3153                                    struct qstr *name, struct nfs_fh *fhandle,
3154                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3155 {
3156         struct nfs4_exception exception = { };
3157         struct rpc_clnt *client = *clnt;
3158         int err;
3159         do {
3160                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3161                 trace_nfs4_lookup(dir, name, err);
3162                 switch (err) {
3163                 case -NFS4ERR_BADNAME:
3164                         err = -ENOENT;
3165                         goto out;
3166                 case -NFS4ERR_MOVED:
3167                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3168                         goto out;
3169                 case -NFS4ERR_WRONGSEC:
3170                         err = -EPERM;
3171                         if (client != *clnt)
3172                                 goto out;
3173                         /* No security negotiation if the user specified 'sec=' */
3174                         if (NFS_SERVER(dir)->flags & NFS_MOUNT_SECFLAVOUR)
3175                                 goto out;
3176                         client = nfs4_create_sec_client(client, dir, name);
3177                         if (IS_ERR(client))
3178                                 return PTR_ERR(client);
3179
3180                         exception.retry = 1;
3181                         break;
3182                 default:
3183                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3184                 }
3185         } while (exception.retry);
3186
3187 out:
3188         if (err == 0)
3189                 *clnt = client;
3190         else if (client != *clnt)
3191                 rpc_shutdown_client(client);
3192
3193         return err;
3194 }
3195
3196 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3197                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3198                             struct nfs4_label *label)
3199 {
3200         int status;
3201         struct rpc_clnt *client = NFS_CLIENT(dir);
3202
3203         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3204         if (client != NFS_CLIENT(dir)) {
3205                 rpc_shutdown_client(client);
3206                 nfs_fixup_secinfo_attributes(fattr);
3207         }
3208         return status;
3209 }
3210
3211 struct rpc_clnt *
3212 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3213                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3214 {
3215         struct rpc_clnt *client = NFS_CLIENT(dir);
3216         int status;
3217
3218         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3219         if (status < 0)
3220                 return ERR_PTR(status);
3221         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3222 }
3223
3224 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3225 {
3226         struct nfs_server *server = NFS_SERVER(inode);
3227         struct nfs4_accessargs args = {
3228                 .fh = NFS_FH(inode),
3229                 .bitmask = server->cache_consistency_bitmask,
3230         };
3231         struct nfs4_accessres res = {
3232                 .server = server,
3233         };
3234         struct rpc_message msg = {
3235                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3236                 .rpc_argp = &args,
3237                 .rpc_resp = &res,
3238                 .rpc_cred = entry->cred,
3239         };
3240         int mode = entry->mask;
3241         int status = 0;
3242
3243         /*
3244          * Determine which access bits we want to ask for...
3245          */
3246         if (mode & MAY_READ)
3247                 args.access |= NFS4_ACCESS_READ;
3248         if (S_ISDIR(inode->i_mode)) {
3249                 if (mode & MAY_WRITE)
3250                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3251                 if (mode & MAY_EXEC)
3252                         args.access |= NFS4_ACCESS_LOOKUP;
3253         } else {
3254                 if (mode & MAY_WRITE)
3255                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3256                 if (mode & MAY_EXEC)
3257                         args.access |= NFS4_ACCESS_EXECUTE;
3258         }
3259
3260         res.fattr = nfs_alloc_fattr();
3261         if (res.fattr == NULL)
3262                 return -ENOMEM;
3263
3264         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3265         if (!status) {
3266                 nfs_access_set_mask(entry, res.access);
3267                 nfs_refresh_inode(inode, res.fattr);
3268         }
3269         nfs_free_fattr(res.fattr);
3270         return status;
3271 }
3272
3273 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3274 {
3275         struct nfs4_exception exception = { };
3276         int err;
3277         do {
3278                 err = _nfs4_proc_access(inode, entry);
3279                 trace_nfs4_access(inode, err);
3280                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3281                                 &exception);
3282         } while (exception.retry);
3283         return err;
3284 }
3285
3286 /*
3287  * TODO: For the time being, we don't try to get any attributes
3288  * along with any of the zero-copy operations READ, READDIR,
3289  * READLINK, WRITE.
3290  *
3291  * In the case of the first three, we want to put the GETATTR
3292  * after the read-type operation -- this is because it is hard
3293  * to predict the length of a GETATTR response in v4, and thus
3294  * align the READ data correctly.  This means that the GETATTR
3295  * may end up partially falling into the page cache, and we should
3296  * shift it into the 'tail' of the xdr_buf before processing.
3297  * To do this efficiently, we need to know the total length
3298  * of data received, which doesn't seem to be available outside
3299  * of the RPC layer.
3300  *
3301  * In the case of WRITE, we also want to put the GETATTR after
3302  * the operation -- in this case because we want to make sure
3303  * we get the post-operation mtime and size.
3304  *
3305  * Both of these changes to the XDR layer would in fact be quite
3306  * minor, but I decided to leave them for a subsequent patch.
3307  */
3308 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3309                 unsigned int pgbase, unsigned int pglen)
3310 {
3311         struct nfs4_readlink args = {
3312                 .fh       = NFS_FH(inode),
3313                 .pgbase   = pgbase,
3314                 .pglen    = pglen,
3315                 .pages    = &page,
3316         };
3317         struct nfs4_readlink_res res;
3318         struct rpc_message msg = {
3319                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3320                 .rpc_argp = &args,
3321                 .rpc_resp = &res,
3322         };
3323
3324         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3325 }
3326
3327 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3328                 unsigned int pgbase, unsigned int pglen)
3329 {
3330         struct nfs4_exception exception = { };
3331         int err;
3332         do {
3333                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3334                 trace_nfs4_readlink(inode, err);
3335                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3336                                 &exception);
3337         } while (exception.retry);
3338         return err;
3339 }
3340
3341 /*
3342  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3343  */
3344 static int
3345 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3346                  int flags)
3347 {
3348         struct nfs4_label l, *ilabel = NULL;
3349         struct nfs_open_context *ctx;
3350         struct nfs4_state *state;
3351         int opened = 0;
3352         int status = 0;
3353
3354         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3355         if (IS_ERR(ctx))
3356                 return PTR_ERR(ctx);
3357
3358         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3359
3360         sattr->ia_mode &= ~current_umask();
3361         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3362         if (IS_ERR(state)) {
3363                 status = PTR_ERR(state);
3364                 goto out;
3365         }
3366 out:
3367         nfs4_label_release_security(ilabel);
3368         put_nfs_open_context(ctx);
3369         return status;
3370 }
3371
3372 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3373 {
3374         struct nfs_server *server = NFS_SERVER(dir);
3375         struct nfs_removeargs args = {
3376                 .fh = NFS_FH(dir),
3377                 .name = *name,
3378         };
3379         struct nfs_removeres res = {
3380                 .server = server,
3381         };
3382         struct rpc_message msg = {
3383                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3384                 .rpc_argp = &args,
3385                 .rpc_resp = &res,
3386         };
3387         int status;
3388
3389         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3390         if (status == 0)
3391                 update_changeattr(dir, &res.cinfo);
3392         return status;
3393 }
3394
3395 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3396 {
3397         struct nfs4_exception exception = { };
3398         int err;
3399         do {
3400                 err = _nfs4_proc_remove(dir, name);
3401                 trace_nfs4_remove(dir, name, err);
3402                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3403                                 &exception);
3404         } while (exception.retry);
3405         return err;
3406 }
3407
3408 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3409 {
3410         struct nfs_server *server = NFS_SERVER(dir);
3411         struct nfs_removeargs *args = msg->rpc_argp;
3412         struct nfs_removeres *res = msg->rpc_resp;
3413
3414         res->server = server;
3415         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3416         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3417
3418         nfs_fattr_init(res->dir_attr);
3419 }
3420
3421 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3422 {
3423         nfs4_setup_sequence(NFS_SERVER(data->dir),
3424                         &data->args.seq_args,
3425                         &data->res.seq_res,
3426                         task);
3427 }
3428
3429 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3430 {
3431         struct nfs_unlinkdata *data = task->tk_calldata;
3432         struct nfs_removeres *res = &data->res;
3433
3434         if (!nfs4_sequence_done(task, &res->seq_res))
3435                 return 0;
3436         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3437                 return 0;
3438         update_changeattr(dir, &res->cinfo);
3439         return 1;
3440 }
3441
3442 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3443 {
3444         struct nfs_server *server = NFS_SERVER(dir);
3445         struct nfs_renameargs *arg = msg->rpc_argp;
3446         struct nfs_renameres *res = msg->rpc_resp;
3447
3448         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3449         res->server = server;
3450         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3451 }
3452
3453 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3454 {
3455         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3456                         &data->args.seq_args,
3457                         &data->res.seq_res,
3458                         task);
3459 }
3460
3461 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3462                                  struct inode *new_dir)
3463 {
3464         struct nfs_renamedata *data = task->tk_calldata;
3465         struct nfs_renameres *res = &data->res;
3466
3467         if (!nfs4_sequence_done(task, &res->seq_res))
3468                 return 0;
3469         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3470                 return 0;
3471
3472         update_changeattr(old_dir, &res->old_cinfo);
3473         update_changeattr(new_dir, &res->new_cinfo);
3474         return 1;
3475 }
3476
3477 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3478                 struct inode *new_dir, struct qstr *new_name)
3479 {
3480         struct nfs_server *server = NFS_SERVER(old_dir);
3481         struct nfs_renameargs arg = {
3482                 .old_dir = NFS_FH(old_dir),
3483                 .new_dir = NFS_FH(new_dir),
3484                 .old_name = old_name,
3485                 .new_name = new_name,
3486         };
3487         struct nfs_renameres res = {
3488                 .server = server,
3489         };
3490         struct rpc_message msg = {
3491                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3492                 .rpc_argp = &arg,
3493                 .rpc_resp = &res,
3494         };
3495         int status = -ENOMEM;
3496
3497         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3498         if (!status) {
3499                 update_changeattr(old_dir, &res.old_cinfo);
3500                 update_changeattr(new_dir, &res.new_cinfo);
3501         }
3502         return status;
3503 }
3504
3505 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3506                 struct inode *new_dir, struct qstr *new_name)
3507 {
3508         struct nfs4_exception exception = { };
3509         int err;
3510         do {
3511                 err = _nfs4_proc_rename(old_dir, old_name,
3512                                         new_dir, new_name);
3513                 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3514                 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3515                                 &exception);
3516         } while (exception.retry);
3517         return err;
3518 }
3519
3520 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3521 {
3522         struct nfs_server *server = NFS_SERVER(inode);
3523         struct nfs4_link_arg arg = {
3524                 .fh     = NFS_FH(inode),
3525                 .dir_fh = NFS_FH(dir),
3526                 .name   = name,
3527                 .bitmask = server->attr_bitmask,
3528         };
3529         struct nfs4_link_res res = {
3530                 .server = server,
3531                 .label = NULL,
3532         };
3533         struct rpc_message msg = {
3534                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3535                 .rpc_argp = &arg,
3536                 .rpc_resp = &res,
3537         };
3538         int status = -ENOMEM;
3539
3540         res.fattr = nfs_alloc_fattr();
3541         if (res.fattr == NULL)
3542                 goto out;
3543
3544         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3545         if (IS_ERR(res.label)) {
3546                 status = PTR_ERR(res.label);
3547                 goto out;
3548         }
3549         arg.bitmask = nfs4_bitmask(server, res.label);
3550
3551         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3552         if (!status) {
3553                 update_changeattr(dir, &res.cinfo);
3554                 status = nfs_post_op_update_inode(inode, res.fattr);
3555                 if (!status)
3556                         nfs_setsecurity(inode, res.fattr, res.label);
3557         }
3558
3559
3560         nfs4_label_free(res.label);
3561
3562 out:
3563         nfs_free_fattr(res.fattr);
3564         return status;
3565 }
3566
3567 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3568 {
3569         struct nfs4_exception exception = { };
3570         int err;
3571         do {
3572                 err = nfs4_handle_exception(NFS_SERVER(inode),
3573                                 _nfs4_proc_link(inode, dir, name),
3574                                 &exception);
3575         } while (exception.retry);
3576         return err;
3577 }
3578
3579 struct nfs4_createdata {
3580         struct rpc_message msg;
3581         struct nfs4_create_arg arg;
3582         struct nfs4_create_res res;
3583         struct nfs_fh fh;
3584         struct nfs_fattr fattr;
3585         struct nfs4_label *label;
3586 };
3587
3588 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3589                 struct qstr *name, struct iattr *sattr, u32 ftype)
3590 {
3591         struct nfs4_createdata *data;
3592
3593         data = kzalloc(sizeof(*data), GFP_KERNEL);
3594         if (data != NULL) {
3595                 struct nfs_server *server = NFS_SERVER(dir);
3596
3597                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3598                 if (IS_ERR(data->label))
3599                         goto out_free;
3600
3601                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3602                 data->msg.rpc_argp = &data->arg;
3603                 data->msg.rpc_resp = &data->res;
3604                 data->arg.dir_fh = NFS_FH(dir);
3605                 data->arg.server = server;
3606                 data->arg.name = name;
3607                 data->arg.attrs = sattr;
3608                 data->arg.ftype = ftype;
3609                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3610                 data->res.server = server;
3611                 data->res.fh = &data->fh;
3612                 data->res.fattr = &data->fattr;
3613                 data->res.label = data->label;
3614                 nfs_fattr_init(data->res.fattr);
3615         }
3616         return data;
3617 out_free:
3618         kfree(data);
3619         return NULL;
3620 }
3621
3622 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3623 {
3624         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3625                                     &data->arg.seq_args, &data->res.seq_res, 1);
3626         if (status == 0) {
3627                 update_changeattr(dir, &data->res.dir_cinfo);
3628                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3629         }
3630         return status;
3631 }
3632
3633 static void nfs4_free_createdata(struct nfs4_createdata *data)
3634 {
3635         nfs4_label_free(data->label);
3636         kfree(data);
3637 }
3638
3639 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3640                 struct page *page, unsigned int len, struct iattr *sattr,
3641                 struct nfs4_label *label)
3642 {
3643         struct nfs4_createdata *data;
3644         int status = -ENAMETOOLONG;
3645
3646         if (len > NFS4_MAXPATHLEN)
3647                 goto out;
3648
3649         status = -ENOMEM;
3650         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3651         if (data == NULL)
3652                 goto out;
3653
3654         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3655         data->arg.u.symlink.pages = &page;
3656         data->arg.u.symlink.len = len;
3657         data->arg.label = label;
3658
3659         status = nfs4_do_create(dir, dentry, data);
3660
3661         nfs4_free_createdata(data);
3662 out:
3663         return status;
3664 }
3665
3666 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3667                 struct page *page, unsigned int len, struct iattr *sattr)
3668 {
3669         struct nfs4_exception exception = { };
3670         struct nfs4_label l, *label = NULL;
3671         int err;
3672
3673         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3674
3675         do {
3676                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3677                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3678                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3679                                 &exception);
3680         } while (exception.retry);
3681
3682         nfs4_label_release_security(label);
3683         return err;
3684 }
3685
3686 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3687                 struct iattr *sattr, struct nfs4_label *label)
3688 {
3689         struct nfs4_createdata *data;
3690         int status = -ENOMEM;
3691
3692         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3693         if (data == NULL)
3694                 goto out;
3695
3696         data->arg.label = label;
3697         status = nfs4_do_create(dir, dentry, data);
3698
3699         nfs4_free_createdata(data);
3700 out:
3701         return status;
3702 }
3703
3704 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3705                 struct iattr *sattr)
3706 {
3707         struct nfs4_exception exception = { };
3708         struct nfs4_label l, *label = NULL;
3709         int err;
3710
3711         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3712
3713         sattr->ia_mode &= ~current_umask();
3714         do {
3715                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3716                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3717                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3718                                 &exception);
3719         } while (exception.retry);
3720         nfs4_label_release_security(label);
3721
3722         return err;
3723 }
3724
3725 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3726                 u64 cookie, struct page **pages, unsigned int count, int plus)
3727 {
3728         struct inode            *dir = dentry->d_inode;
3729         struct nfs4_readdir_arg args = {
3730                 .fh = NFS_FH(dir),
3731                 .pages = pages,
3732                 .pgbase = 0,
3733                 .count = count,
3734                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3735                 .plus = plus,
3736         };
3737         struct nfs4_readdir_res res;
3738         struct rpc_message msg = {
3739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3740                 .rpc_argp = &args,
3741                 .rpc_resp = &res,
3742                 .rpc_cred = cred,
3743         };
3744         int                     status;
3745
3746         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3747                         dentry->d_parent->d_name.name,
3748                         dentry->d_name.name,
3749                         (unsigned long long)cookie);
3750         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3751         res.pgbase = args.pgbase;
3752         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3753         if (status >= 0) {
3754                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3755                 status += args.pgbase;
3756         }
3757
3758         nfs_invalidate_atime(dir);
3759
3760         dprintk("%s: returns %d\n", __func__, status);
3761         return status;
3762 }
3763
3764 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3765                 u64 cookie, struct page **pages, unsigned int count, int plus)
3766 {
3767         struct nfs4_exception exception = { };
3768         int err;
3769         do {
3770                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3771                                 pages, count, plus);
3772                 trace_nfs4_readdir(dentry->d_inode, err);
3773                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3774                                 &exception);
3775         } while (exception.retry);
3776         return err;
3777 }
3778
3779 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3780                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3781 {
3782         struct nfs4_createdata *data;
3783         int mode = sattr->ia_mode;
3784         int status = -ENOMEM;
3785
3786         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3787         if (data == NULL)
3788                 goto out;
3789
3790         if (S_ISFIFO(mode))
3791                 data->arg.ftype = NF4FIFO;
3792         else if (S_ISBLK(mode)) {
3793                 data->arg.ftype = NF4BLK;
3794                 data->arg.u.device.specdata1 = MAJOR(rdev);
3795                 data->arg.u.device.specdata2 = MINOR(rdev);
3796         }
3797         else if (S_ISCHR(mode)) {
3798                 data->arg.ftype = NF4CHR;
3799                 data->arg.u.device.specdata1 = MAJOR(rdev);
3800                 data->arg.u.device.specdata2 = MINOR(rdev);
3801         } else if (!S_ISSOCK(mode)) {
3802                 status = -EINVAL;
3803                 goto out_free;
3804         }
3805
3806         data->arg.label = label;
3807         status = nfs4_do_create(dir, dentry, data);
3808 out_free:
3809         nfs4_free_createdata(data);
3810 out:
3811         return status;
3812 }
3813
3814 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3815                 struct iattr *sattr, dev_t rdev)
3816 {
3817         struct nfs4_exception exception = { };
3818         struct nfs4_label l, *label = NULL;
3819         int err;
3820
3821         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3822
3823         sattr->ia_mode &= ~current_umask();
3824         do {
3825                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3826                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3827                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3828                                 &exception);
3829         } while (exception.retry);
3830
3831         nfs4_label_release_security(label);
3832
3833         return err;
3834 }
3835
3836 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3837                  struct nfs_fsstat *fsstat)
3838 {
3839         struct nfs4_statfs_arg args = {
3840                 .fh = fhandle,
3841                 .bitmask = server->attr_bitmask,
3842         };
3843         struct nfs4_statfs_res res = {
3844                 .fsstat = fsstat,
3845         };
3846         struct rpc_message msg = {
3847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3848                 .rpc_argp = &args,
3849                 .rpc_resp = &res,
3850         };
3851
3852         nfs_fattr_init(fsstat->fattr);
3853         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3854 }
3855
3856 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3857 {
3858         struct nfs4_exception exception = { };
3859         int err;
3860         do {
3861                 err = nfs4_handle_exception(server,
3862                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3863                                 &exception);
3864         } while (exception.retry);
3865         return err;
3866 }
3867
3868 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3869                 struct nfs_fsinfo *fsinfo)
3870 {
3871         struct nfs4_fsinfo_arg args = {
3872                 .fh = fhandle,
3873                 .bitmask = server->attr_bitmask,
3874         };
3875         struct nfs4_fsinfo_res res = {
3876                 .fsinfo = fsinfo,
3877         };
3878         struct rpc_message msg = {
3879                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3880                 .rpc_argp = &args,
3881                 .rpc_resp = &res,
3882         };
3883
3884         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3885 }
3886
3887 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3888 {
3889         struct nfs4_exception exception = { };
3890         unsigned long now = jiffies;
3891         int err;
3892
3893         do {
3894                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3895                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3896                 if (err == 0) {
3897                         struct nfs_client *clp = server->nfs_client;
3898
3899                         spin_lock(&clp->cl_lock);
3900                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3901                         clp->cl_last_renewal = now;
3902                         spin_unlock(&clp->cl_lock);
3903                         break;
3904                 }
3905                 err = nfs4_handle_exception(server, err, &exception);
3906         } while (exception.retry);
3907         return err;
3908 }
3909
3910 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3911 {
3912         int error;
3913
3914         nfs_fattr_init(fsinfo->fattr);
3915         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3916         if (error == 0) {
3917                 /* block layout checks this! */
3918                 server->pnfs_blksize = fsinfo->blksize;
3919                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3920         }
3921
3922         return error;
3923 }
3924
3925 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3926                 struct nfs_pathconf *pathconf)
3927 {
3928         struct nfs4_pathconf_arg args = {
3929                 .fh = fhandle,
3930                 .bitmask = server->attr_bitmask,
3931         };
3932         struct nfs4_pathconf_res res = {
3933                 .pathconf = pathconf,
3934         };
3935         struct rpc_message msg = {
3936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3937                 .rpc_argp = &args,
3938                 .rpc_resp = &res,
3939         };
3940
3941         /* None of the pathconf attributes are mandatory to implement */
3942         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3943                 memset(pathconf, 0, sizeof(*pathconf));
3944                 return 0;
3945         }
3946
3947         nfs_fattr_init(pathconf->fattr);
3948         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3949 }
3950
3951 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3952                 struct nfs_pathconf *pathconf)
3953 {
3954         struct nfs4_exception exception = { };
3955         int err;
3956
3957         do {
3958                 err = nfs4_handle_exception(server,
3959                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3960                                 &exception);
3961         } while (exception.retry);
3962         return err;
3963 }
3964
3965 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3966                 const struct nfs_open_context *ctx,
3967                 const struct nfs_lock_context *l_ctx,
3968                 fmode_t fmode)
3969 {
3970         const struct nfs_lockowner *lockowner = NULL;
3971
3972         if (l_ctx != NULL)
3973                 lockowner = &l_ctx->lockowner;
3974         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3975 }
3976 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3977
3978 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3979                 const struct nfs_open_context *ctx,
3980                 const struct nfs_lock_context *l_ctx,
3981                 fmode_t fmode)
3982 {
3983         nfs4_stateid current_stateid;
3984
3985         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3986                 return false;
3987         return nfs4_stateid_match(stateid, &current_stateid);
3988 }
3989
3990 static bool nfs4_error_stateid_expired(int err)
3991 {
3992         switch (err) {
3993         case -NFS4ERR_DELEG_REVOKED:
3994         case -NFS4ERR_ADMIN_REVOKED:
3995         case -NFS4ERR_BAD_STATEID:
3996         case -NFS4ERR_STALE_STATEID:
3997         case -NFS4ERR_OLD_STATEID:
3998         case -NFS4ERR_OPENMODE:
3999         case -NFS4ERR_EXPIRED:
4000                 return true;
4001         }
4002         return false;
4003 }
4004
4005 void __nfs4_read_done_cb(struct nfs_read_data *data)
4006 {
4007         nfs_invalidate_atime(data->header->inode);
4008 }
4009
4010 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
4011 {
4012         struct nfs_server *server = NFS_SERVER(data->header->inode);
4013
4014         trace_nfs4_read(data, task->tk_status);
4015         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
4016                 rpc_restart_call_prepare(task);
4017                 return -EAGAIN;
4018         }
4019
4020         __nfs4_read_done_cb(data);
4021         if (task->tk_status > 0)
4022                 renew_lease(server, data->timestamp);
4023         return 0;
4024 }
4025
4026 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4027                 struct nfs_readargs *args)
4028 {
4029
4030         if (!nfs4_error_stateid_expired(task->tk_status) ||
4031                 nfs4_stateid_is_current(&args->stateid,
4032                                 args->context,
4033                                 args->lock_context,
4034                                 FMODE_READ))
4035                 return false;
4036         rpc_restart_call_prepare(task);
4037         return true;
4038 }
4039
4040 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4041 {
4042
4043         dprintk("--> %s\n", __func__);
4044
4045         if (!nfs4_sequence_done(task, &data->res.seq_res))
4046                 return -EAGAIN;
4047         if (nfs4_read_stateid_changed(task, &data->args))
4048                 return -EAGAIN;
4049         return data->read_done_cb ? data->read_done_cb(task, data) :
4050                                     nfs4_read_done_cb(task, data);
4051 }
4052
4053 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4054 {
4055         data->timestamp   = jiffies;
4056         data->read_done_cb = nfs4_read_done_cb;
4057         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4058         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4059 }
4060
4061 static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4062 {
4063         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4064                         &data->args.seq_args,
4065                         &data->res.seq_res,
4066                         task))
4067                 return 0;
4068         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4069                                 data->args.lock_context, FMODE_READ) == -EIO)
4070                 return -EIO;
4071         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4072                 return -EIO;
4073         return 0;
4074 }
4075
4076 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4077 {
4078         struct inode *inode = data->header->inode;
4079
4080         trace_nfs4_write(data, task->tk_status);
4081         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4082                 rpc_restart_call_prepare(task);
4083                 return -EAGAIN;
4084         }
4085         if (task->tk_status >= 0) {
4086                 renew_lease(NFS_SERVER(inode), data->timestamp);
4087                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4088         }
4089         return 0;
4090 }
4091
4092 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4093                 struct nfs_writeargs *args)
4094 {
4095
4096         if (!nfs4_error_stateid_expired(task->tk_status) ||
4097                 nfs4_stateid_is_current(&args->stateid,
4098                                 args->context,
4099                                 args->lock_context,
4100                                 FMODE_WRITE))
4101                 return false;
4102         rpc_restart_call_prepare(task);
4103         return true;
4104 }
4105
4106 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4107 {
4108         if (!nfs4_sequence_done(task, &data->res.seq_res))
4109                 return -EAGAIN;
4110         if (nfs4_write_stateid_changed(task, &data->args))
4111                 return -EAGAIN;
4112         return data->write_done_cb ? data->write_done_cb(task, data) :
4113                 nfs4_write_done_cb(task, data);
4114 }
4115
4116 static
4117 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4118 {
4119         const struct nfs_pgio_header *hdr = data->header;
4120
4121         /* Don't request attributes for pNFS or O_DIRECT writes */
4122         if (data->ds_clp != NULL || hdr->dreq != NULL)
4123                 return false;
4124         /* Otherwise, request attributes if and only if we don't hold
4125          * a delegation
4126          */
4127         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4128 }
4129
4130 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4131 {
4132         struct nfs_server *server = NFS_SERVER(data->header->inode);
4133
4134         if (!nfs4_write_need_cache_consistency_data(data)) {
4135                 data->args.bitmask = NULL;
4136                 data->res.fattr = NULL;
4137         } else
4138                 data->args.bitmask = server->cache_consistency_bitmask;
4139
4140         if (!data->write_done_cb)
4141                 data->write_done_cb = nfs4_write_done_cb;
4142         data->res.server = server;
4143         data->timestamp   = jiffies;
4144
4145         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4146         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4147 }
4148
4149 static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4150 {
4151         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4152                         &data->args.seq_args,
4153                         &data->res.seq_res,
4154                         task))
4155                 return 0;
4156         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4157                                 data->args.lock_context, FMODE_WRITE) == -EIO)
4158                 return -EIO;
4159         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4160                 return -EIO;
4161         return 0;
4162 }
4163
4164 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4165 {
4166         nfs4_setup_sequence(NFS_SERVER(data->inode),
4167                         &data->args.seq_args,
4168                         &data->res.seq_res,
4169                         task);
4170 }
4171
4172 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4173 {
4174         struct inode *inode = data->inode;
4175
4176         trace_nfs4_commit(data, task->tk_status);
4177         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4178                 rpc_restart_call_prepare(task);
4179                 return -EAGAIN;
4180         }
4181         return 0;
4182 }
4183
4184 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4185 {
4186         if (!nfs4_sequence_done(task, &data->res.seq_res))
4187                 return -EAGAIN;
4188         return data->commit_done_cb(task, data);
4189 }
4190
4191 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4192 {
4193         struct nfs_server *server = NFS_SERVER(data->inode);
4194
4195         if (data->commit_done_cb == NULL)
4196                 data->commit_done_cb = nfs4_commit_done_cb;
4197         data->res.server = server;
4198         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4199         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4200 }
4201
4202 struct nfs4_renewdata {
4203         struct nfs_client       *client;
4204         unsigned long           timestamp;
4205 };
4206
4207 /*
4208  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4209  * standalone procedure for queueing an asynchronous RENEW.
4210  */
4211 static void nfs4_renew_release(void *calldata)
4212 {
4213         struct nfs4_renewdata *data = calldata;
4214         struct nfs_client *clp = data->client;
4215
4216         if (atomic_read(&clp->cl_count) > 1)
4217                 nfs4_schedule_state_renewal(clp);
4218         nfs_put_client(clp);
4219         kfree(data);
4220 }
4221
4222 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4223 {
4224         struct nfs4_renewdata *data = calldata;
4225         struct nfs_client *clp = data->client;
4226         unsigned long timestamp = data->timestamp;
4227
4228         trace_nfs4_renew_async(clp, task->tk_status);
4229         if (task->tk_status < 0) {
4230                 /* Unless we're shutting down, schedule state recovery! */
4231                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4232                         return;
4233                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4234                         nfs4_schedule_lease_recovery(clp);
4235                         return;
4236                 }
4237                 nfs4_schedule_path_down_recovery(clp);
4238         }
4239         do_renew_lease(clp, timestamp);
4240 }
4241
4242 static const struct rpc_call_ops nfs4_renew_ops = {
4243         .rpc_call_done = nfs4_renew_done,
4244         .rpc_release = nfs4_renew_release,
4245 };
4246
4247 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4248 {
4249         struct rpc_message msg = {
4250                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4251                 .rpc_argp       = clp,
4252                 .rpc_cred       = cred,
4253         };
4254         struct nfs4_renewdata *data;
4255
4256         if (renew_flags == 0)
4257                 return 0;
4258         if (!atomic_inc_not_zero(&clp->cl_count))
4259                 return -EIO;
4260         data = kmalloc(sizeof(*data), GFP_NOFS);
4261         if (data == NULL)
4262                 return -ENOMEM;
4263         data->client = clp;
4264         data->timestamp = jiffies;
4265         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4266                         &nfs4_renew_ops, data);
4267 }
4268
4269 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4270 {
4271         struct rpc_message msg = {
4272                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4273                 .rpc_argp       = clp,
4274                 .rpc_cred       = cred,
4275         };
4276         unsigned long now = jiffies;
4277         int status;
4278
4279         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4280         if (status < 0)
4281                 return status;
4282         do_renew_lease(clp, now);
4283         return 0;
4284 }
4285
4286 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4287 {
4288         return (server->caps & NFS_CAP_ACLS)
4289                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4290                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4291 }
4292
4293 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4294  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4295  * the stack.
4296  */
4297 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4298
4299 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4300                 struct page **pages, unsigned int *pgbase)
4301 {
4302         struct page *newpage, **spages;
4303         int rc = 0;
4304         size_t len;
4305         spages = pages;
4306
4307         do {
4308                 len = min_t(size_t, PAGE_SIZE, buflen);
4309                 newpage = alloc_page(GFP_KERNEL);
4310
4311                 if (newpage == NULL)
4312                         goto unwind;
4313                 memcpy(page_address(newpage), buf, len);
4314                 buf += len;
4315                 buflen -= len;
4316                 *pages++ = newpage;
4317                 rc++;
4318         } while (buflen != 0);
4319
4320         return rc;
4321
4322 unwind:
4323         for(; rc > 0; rc--)
4324                 __free_page(spages[rc-1]);
4325         return -ENOMEM;
4326 }
4327
4328 struct nfs4_cached_acl {
4329         int cached;
4330         size_t len;
4331         char data[0];
4332 };
4333
4334 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4335 {
4336         struct nfs_inode *nfsi = NFS_I(inode);
4337
4338         spin_lock(&inode->i_lock);
4339         kfree(nfsi->nfs4_acl);
4340         nfsi->nfs4_acl = acl;
4341         spin_unlock(&inode->i_lock);
4342 }
4343
4344 static void nfs4_zap_acl_attr(struct inode *inode)
4345 {
4346         nfs4_set_cached_acl(inode, NULL);
4347 }
4348
4349 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4350 {
4351         struct nfs_inode *nfsi = NFS_I(inode);
4352         struct nfs4_cached_acl *acl;
4353         int ret = -ENOENT;
4354
4355         spin_lock(&inode->i_lock);
4356         acl = nfsi->nfs4_acl;
4357         if (acl == NULL)
4358                 goto out;
4359         if (buf == NULL) /* user is just asking for length */
4360                 goto out_len;
4361         if (acl->cached == 0)
4362                 goto out;
4363         ret = -ERANGE; /* see getxattr(2) man page */
4364         if (acl->len > buflen)
4365                 goto out;
4366         memcpy(buf, acl->data, acl->len);
4367 out_len:
4368         ret = acl->len;
4369 out:
4370         spin_unlock(&inode->i_lock);
4371         return ret;
4372 }
4373
4374 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4375 {
4376         struct nfs4_cached_acl *acl;
4377         size_t buflen = sizeof(*acl) + acl_len;
4378
4379         if (buflen <= PAGE_SIZE) {
4380                 acl = kmalloc(buflen, GFP_KERNEL);
4381                 if (acl == NULL)
4382                         goto out;
4383                 acl->cached = 1;
4384                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4385         } else {
4386                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4387                 if (acl == NULL)
4388                         goto out;
4389                 acl->cached = 0;
4390         }
4391         acl->len = acl_len;
4392 out:
4393         nfs4_set_cached_acl(inode, acl);
4394 }
4395
4396 /*
4397  * The getxattr API returns the required buffer length when called with a
4398  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4399  * the required buf.  On a NULL buf, we send a page of data to the server
4400  * guessing that the ACL request can be serviced by a page. If so, we cache
4401  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4402  * the cache. If not so, we throw away the page, and cache the required
4403  * length. The next getxattr call will then produce another round trip to
4404  * the server, this time with the input buf of the required size.
4405  */
4406 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4407 {
4408         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4409         struct nfs_getaclargs args = {
4410                 .fh = NFS_FH(inode),
4411                 .acl_pages = pages,
4412                 .acl_len = buflen,
4413         };
4414         struct nfs_getaclres res = {
4415                 .acl_len = buflen,
4416         };
4417         struct rpc_message msg = {
4418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4419                 .rpc_argp = &args,
4420                 .rpc_resp = &res,
4421         };
4422         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4423         int ret = -ENOMEM, i;
4424
4425         /* As long as we're doing a round trip to the server anyway,
4426          * let's be prepared for a page of acl data. */
4427         if (npages == 0)
4428                 npages = 1;
4429         if (npages > ARRAY_SIZE(pages))
4430                 return -ERANGE;
4431
4432         for (i = 0; i < npages; i++) {
4433                 pages[i] = alloc_page(GFP_KERNEL);
4434                 if (!pages[i])
4435                         goto out_free;
4436         }
4437
4438         /* for decoding across pages */
4439         res.acl_scratch = alloc_page(GFP_KERNEL);
4440         if (!res.acl_scratch)
4441                 goto out_free;
4442
4443         args.acl_len = npages * PAGE_SIZE;
4444         args.acl_pgbase = 0;
4445
4446         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4447                 __func__, buf, buflen, npages, args.acl_len);
4448         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4449                              &msg, &args.seq_args, &res.seq_res, 0);
4450         if (ret)
4451                 goto out_free;
4452
4453         /* Handle the case where the passed-in buffer is too short */
4454         if (res.acl_flags & NFS4_ACL_TRUNC) {
4455                 /* Did the user only issue a request for the acl length? */
4456                 if (buf == NULL)
4457                         goto out_ok;
4458                 ret = -ERANGE;
4459                 goto out_free;
4460         }
4461         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4462         if (buf) {
4463                 if (res.acl_len > buflen) {
4464                         ret = -ERANGE;
4465                         goto out_free;
4466                 }
4467                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4468         }
4469 out_ok:
4470         ret = res.acl_len;
4471 out_free:
4472         for (i = 0; i < npages; i++)
4473                 if (pages[i])
4474                         __free_page(pages[i]);
4475         if (res.acl_scratch)
4476                 __free_page(res.acl_scratch);
4477         return ret;
4478 }
4479
4480 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4481 {
4482         struct nfs4_exception exception = { };
4483         ssize_t ret;
4484         do {
4485                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4486                 trace_nfs4_get_acl(inode, ret);
4487                 if (ret >= 0)
4488                         break;
4489                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4490         } while (exception.retry);
4491         return ret;
4492 }
4493
4494 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4495 {
4496         struct nfs_server *server = NFS_SERVER(inode);
4497         int ret;
4498
4499         if (!nfs4_server_supports_acls(server))
4500                 return -EOPNOTSUPP;
4501         ret = nfs_revalidate_inode(server, inode);
4502         if (ret < 0)
4503                 return ret;
4504         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4505                 nfs_zap_acl_cache(inode);
4506         ret = nfs4_read_cached_acl(inode, buf, buflen);
4507         if (ret != -ENOENT)
4508                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4509                  * but no cached acl data, just the acl length */
4510                 return ret;
4511         return nfs4_get_acl_uncached(inode, buf, buflen);
4512 }
4513
4514 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4515 {
4516         struct nfs_server *server = NFS_SERVER(inode);
4517         struct page *pages[NFS4ACL_MAXPAGES];
4518         struct nfs_setaclargs arg = {
4519                 .fh             = NFS_FH(inode),
4520                 .acl_pages      = pages,
4521                 .acl_len        = buflen,
4522         };
4523         struct nfs_setaclres res;
4524         struct rpc_message msg = {
4525                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4526                 .rpc_argp       = &arg,
4527                 .rpc_resp       = &res,
4528         };
4529         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4530         int ret, i;
4531
4532         if (!nfs4_server_supports_acls(server))
4533                 return -EOPNOTSUPP;
4534         if (npages > ARRAY_SIZE(pages))
4535                 return -ERANGE;
4536         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4537         if (i < 0)
4538                 return i;
4539         nfs4_inode_return_delegation(inode);
4540         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4541
4542         /*
4543          * Free each page after tx, so the only ref left is
4544          * held by the network stack
4545          */
4546         for (; i > 0; i--)
4547                 put_page(pages[i-1]);
4548
4549         /*
4550          * Acl update can result in inode attribute update.
4551          * so mark the attribute cache invalid.
4552          */
4553         spin_lock(&inode->i_lock);
4554         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4555         spin_unlock(&inode->i_lock);
4556         nfs_access_zap_cache(inode);
4557         nfs_zap_acl_cache(inode);
4558         return ret;
4559 }
4560
4561 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4562 {
4563         struct nfs4_exception exception = { };
4564         int err;
4565         do {
4566                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4567                 trace_nfs4_set_acl(inode, err);
4568                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4569                                 &exception);
4570         } while (exception.retry);
4571         return err;
4572 }
4573
4574 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4575 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4576                                         size_t buflen)
4577 {
4578         struct nfs_server *server = NFS_SERVER(inode);
4579         struct nfs_fattr fattr;
4580         struct nfs4_label label = {0, 0, buflen, buf};
4581
4582         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4583         struct nfs4_getattr_arg args = {
4584                 .fh             = NFS_FH(inode),
4585                 .bitmask        = bitmask,
4586         };
4587         struct nfs4_getattr_res res = {
4588                 .fattr          = &fattr,
4589                 .label          = &label,
4590                 .server         = server,
4591         };
4592         struct rpc_message msg = {
4593                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4594                 .rpc_argp       = &args,
4595                 .rpc_resp       = &res,
4596         };
4597         int ret;
4598
4599         nfs_fattr_init(&fattr);
4600
4601         ret = rpc_call_sync(server->client, &msg, 0);
4602         if (ret)
4603                 return ret;
4604         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4605                 return -ENOENT;
4606         if (buflen < label.len)
4607                 return -ERANGE;
4608         return 0;
4609 }
4610
4611 static int nfs4_get_security_label(struct inode *inode, void *buf,
4612                                         size_t buflen)
4613 {
4614         struct nfs4_exception exception = { };
4615         int err;
4616
4617         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4618                 return -EOPNOTSUPP;
4619
4620         do {
4621                 err = _nfs4_get_security_label(inode, buf, buflen);
4622                 trace_nfs4_get_security_label(inode, err);
4623                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4624                                 &exception);
4625         } while (exception.retry);
4626         return err;
4627 }
4628
4629 static int _nfs4_do_set_security_label(struct inode *inode,
4630                 struct nfs4_label *ilabel,
4631                 struct nfs_fattr *fattr,
4632                 struct nfs4_label *olabel)
4633 {
4634
4635         struct iattr sattr = {0};
4636         struct nfs_server *server = NFS_SERVER(inode);
4637         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4638         struct nfs_setattrargs args = {
4639                 .fh             = NFS_FH(inode),
4640                 .iap            = &sattr,
4641                 .server         = server,
4642                 .bitmask        = bitmask,
4643                 .label          = ilabel,
4644         };
4645         struct nfs_setattrres res = {
4646                 .fattr          = fattr,
4647                 .label          = olabel,
4648                 .server         = server,
4649         };
4650         struct rpc_message msg = {
4651                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4652                 .rpc_argp       = &args,
4653                 .rpc_resp       = &res,
4654         };
4655         int status;
4656
4657         nfs4_stateid_copy(&args.stateid, &zero_stateid);
4658
4659         status = rpc_call_sync(server->client, &msg, 0);
4660         if (status)
4661                 dprintk("%s failed: %d\n", __func__, status);
4662
4663         return status;
4664 }
4665
4666 static int nfs4_do_set_security_label(struct inode *inode,
4667                 struct nfs4_label *ilabel,
4668                 struct nfs_fattr *fattr,
4669                 struct nfs4_label *olabel)
4670 {
4671         struct nfs4_exception exception = { };
4672         int err;
4673
4674         do {
4675                 err = _nfs4_do_set_security_label(inode, ilabel,
4676                                 fattr, olabel);
4677                 trace_nfs4_set_security_label(inode, err);
4678                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4679                                 &exception);
4680         } while (exception.retry);
4681         return err;
4682 }
4683
4684 static int
4685 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4686 {
4687         struct nfs4_label ilabel, *olabel = NULL;
4688         struct nfs_fattr fattr;
4689         struct rpc_cred *cred;
4690         struct inode *inode = dentry->d_inode;
4691         int status;
4692
4693         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4694                 return -EOPNOTSUPP;
4695
4696         nfs_fattr_init(&fattr);
4697
4698         ilabel.pi = 0;
4699         ilabel.lfs = 0;
4700         ilabel.label = (char *)buf;
4701         ilabel.len = buflen;
4702
4703         cred = rpc_lookup_cred();
4704         if (IS_ERR(cred))
4705                 return PTR_ERR(cred);
4706
4707         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4708         if (IS_ERR(olabel)) {
4709                 status = -PTR_ERR(olabel);
4710                 goto out;
4711         }
4712
4713         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4714         if (status == 0)
4715                 nfs_setsecurity(inode, &fattr, olabel);
4716
4717         nfs4_label_free(olabel);
4718 out:
4719         put_rpccred(cred);
4720         return status;
4721 }
4722 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4723
4724
4725 static int
4726 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4727 {
4728         struct nfs_client *clp = server->nfs_client;
4729
4730         if (task->tk_status >= 0)
4731                 return 0;
4732         switch(task->tk_status) {
4733                 case -NFS4ERR_DELEG_REVOKED:
4734                 case -NFS4ERR_ADMIN_REVOKED:
4735                 case -NFS4ERR_BAD_STATEID:
4736                         if (state == NULL)
4737                                 break;
4738                         nfs_remove_bad_delegation(state->inode);
4739                 case -NFS4ERR_OPENMODE:
4740                         if (state == NULL)
4741                                 break;
4742                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4743                                 goto recovery_failed;
4744                         goto wait_on_recovery;
4745                 case -NFS4ERR_EXPIRED:
4746                         if (state != NULL) {
4747                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4748                                         goto recovery_failed;
4749                         }
4750                 case -NFS4ERR_STALE_STATEID:
4751                 case -NFS4ERR_STALE_CLIENTID:
4752                         nfs4_schedule_lease_recovery(clp);
4753                         goto wait_on_recovery;
4754                 case -NFS4ERR_MOVED:
4755                         if (nfs4_schedule_migration_recovery(server) < 0)
4756                                 goto recovery_failed;
4757                         goto wait_on_recovery;
4758 #if defined(CONFIG_NFS_V4_1)
4759                 case -NFS4ERR_BADSESSION:
4760                 case -NFS4ERR_BADSLOT:
4761                 case -NFS4ERR_BAD_HIGH_SLOT:
4762                 case -NFS4ERR_DEADSESSION:
4763                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4764                 case -NFS4ERR_SEQ_FALSE_RETRY:
4765                 case -NFS4ERR_SEQ_MISORDERED:
4766                         dprintk("%s ERROR %d, Reset session\n", __func__,
4767                                 task->tk_status);
4768                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4769                         goto restart_call;
4770 #endif /* CONFIG_NFS_V4_1 */
4771                 case -NFS4ERR_DELAY:
4772                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4773                 case -NFS4ERR_GRACE:
4774                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4775                 case -NFS4ERR_RETRY_UNCACHED_REP:
4776                 case -NFS4ERR_OLD_STATEID:
4777                         goto restart_call;
4778         }
4779         task->tk_status = nfs4_map_errors(task->tk_status);
4780         return 0;
4781 recovery_failed:
4782         task->tk_status = -EIO;
4783         return 0;
4784 wait_on_recovery:
4785         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4786         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4787                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4788         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4789                 goto recovery_failed;
4790 restart_call:
4791         task->tk_status = 0;
4792         return -EAGAIN;
4793 }
4794
4795 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4796                                     nfs4_verifier *bootverf)
4797 {
4798         __be32 verf[2];
4799
4800         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4801                 /* An impossible timestamp guarantees this value
4802                  * will never match a generated boot time. */
4803                 verf[0] = 0;
4804                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4805         } else {
4806                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4807                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4808                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4809         }
4810         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4811 }
4812
4813 static unsigned int
4814 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4815                                    char *buf, size_t len)
4816 {
4817         unsigned int result;
4818
4819         rcu_read_lock();
4820         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4821                                 clp->cl_ipaddr,
4822                                 rpc_peeraddr2str(clp->cl_rpcclient,
4823                                                         RPC_DISPLAY_ADDR),
4824                                 rpc_peeraddr2str(clp->cl_rpcclient,
4825                                                         RPC_DISPLAY_PROTO));
4826         rcu_read_unlock();
4827         return result;
4828 }
4829
4830 static unsigned int
4831 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4832                                 char *buf, size_t len)
4833 {
4834         const char *nodename = clp->cl_rpcclient->cl_nodename;
4835
4836         if (nfs4_client_id_uniquifier[0] != '\0')
4837                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4838                                 clp->rpc_ops->version,
4839                                 clp->cl_minorversion,
4840                                 nfs4_client_id_uniquifier,
4841                                 nodename);
4842         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4843                                 clp->rpc_ops->version, clp->cl_minorversion,
4844                                 nodename);
4845 }
4846
4847 /**
4848  * nfs4_proc_setclientid - Negotiate client ID
4849  * @clp: state data structure
4850  * @program: RPC program for NFSv4 callback service
4851  * @port: IP port number for NFS4 callback service
4852  * @cred: RPC credential to use for this call
4853  * @res: where to place the result
4854  *
4855  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4856  */
4857 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4858                 unsigned short port, struct rpc_cred *cred,
4859                 struct nfs4_setclientid_res *res)
4860 {
4861         nfs4_verifier sc_verifier;
4862         struct nfs4_setclientid setclientid = {
4863                 .sc_verifier = &sc_verifier,
4864                 .sc_prog = program,
4865                 .sc_cb_ident = clp->cl_cb_ident,
4866         };
4867         struct rpc_message msg = {
4868                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4869                 .rpc_argp = &setclientid,
4870                 .rpc_resp = res,
4871                 .rpc_cred = cred,
4872         };
4873         int status;
4874
4875         /* nfs_client_id4 */
4876         nfs4_init_boot_verifier(clp, &sc_verifier);
4877         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4878                 setclientid.sc_name_len =
4879                                 nfs4_init_uniform_client_string(clp,
4880                                                 setclientid.sc_name,
4881                                                 sizeof(setclientid.sc_name));
4882         else
4883                 setclientid.sc_name_len =
4884                                 nfs4_init_nonuniform_client_string(clp,
4885                                                 setclientid.sc_name,
4886                                                 sizeof(setclientid.sc_name));
4887         /* cb_client4 */
4888         rcu_read_lock();
4889         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4890                                 sizeof(setclientid.sc_netid), "%s",
4891                                 rpc_peeraddr2str(clp->cl_rpcclient,
4892                                                         RPC_DISPLAY_NETID));
4893         rcu_read_unlock();
4894         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4895                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4896                                 clp->cl_ipaddr, port >> 8, port & 255);
4897
4898         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4899                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4900                 setclientid.sc_name_len, setclientid.sc_name);
4901         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4902         trace_nfs4_setclientid(clp, status);
4903         dprintk("NFS reply setclientid: %d\n", status);
4904         return status;
4905 }
4906
4907 /**
4908  * nfs4_proc_setclientid_confirm - Confirm client ID
4909  * @clp: state data structure
4910  * @res: result of a previous SETCLIENTID
4911  * @cred: RPC credential to use for this call
4912  *
4913  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4914  */
4915 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4916                 struct nfs4_setclientid_res *arg,
4917                 struct rpc_cred *cred)
4918 {
4919         struct rpc_message msg = {
4920                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4921                 .rpc_argp = arg,
4922                 .rpc_cred = cred,
4923         };
4924         int status;
4925
4926         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4927                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4928                 clp->cl_clientid);
4929         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4930         trace_nfs4_setclientid_confirm(clp, status);
4931         dprintk("NFS reply setclientid_confirm: %d\n", status);
4932         return status;
4933 }
4934
4935 struct nfs4_delegreturndata {
4936         struct nfs4_delegreturnargs args;
4937         struct nfs4_delegreturnres res;
4938         struct nfs_fh fh;
4939         nfs4_stateid stateid;
4940         unsigned long timestamp;
4941         struct nfs_fattr fattr;
4942         int rpc_status;
4943 };
4944
4945 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4946 {
4947         struct nfs4_delegreturndata *data = calldata;
4948
4949         if (!nfs4_sequence_done(task, &data->res.seq_res))
4950                 return;
4951
4952         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4953         switch (task->tk_status) {
4954         case -NFS4ERR_STALE_STATEID:
4955         case -NFS4ERR_EXPIRED:
4956         case 0:
4957                 renew_lease(data->res.server, data->timestamp);
4958                 break;
4959         default:
4960                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4961                                 -EAGAIN) {
4962                         rpc_restart_call_prepare(task);
4963                         return;
4964                 }
4965         }
4966         data->rpc_status = task->tk_status;
4967 }
4968
4969 static void nfs4_delegreturn_release(void *calldata)
4970 {
4971         kfree(calldata);
4972 }
4973
4974 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4975 {
4976         struct nfs4_delegreturndata *d_data;
4977
4978         d_data = (struct nfs4_delegreturndata *)data;
4979
4980         nfs4_setup_sequence(d_data->res.server,
4981                         &d_data->args.seq_args,
4982                         &d_data->res.seq_res,
4983                         task);
4984 }
4985
4986 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4987         .rpc_call_prepare = nfs4_delegreturn_prepare,
4988         .rpc_call_done = nfs4_delegreturn_done,
4989         .rpc_release = nfs4_delegreturn_release,
4990 };
4991
4992 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4993 {
4994         struct nfs4_delegreturndata *data;
4995         struct nfs_server *server = NFS_SERVER(inode);
4996         struct rpc_task *task;
4997         struct rpc_message msg = {
4998                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4999                 .rpc_cred = cred,
5000         };
5001         struct rpc_task_setup task_setup_data = {
5002                 .rpc_client = server->client,
5003                 .rpc_message = &msg,
5004                 .callback_ops = &nfs4_delegreturn_ops,
5005                 .flags = RPC_TASK_ASYNC,
5006         };
5007         int status = 0;
5008
5009         data = kzalloc(sizeof(*data), GFP_NOFS);
5010         if (data == NULL)
5011                 return -ENOMEM;
5012         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5013         data->args.fhandle = &data->fh;
5014         data->args.stateid = &data->stateid;
5015         data->args.bitmask = server->cache_consistency_bitmask;
5016         nfs_copy_fh(&data->fh, NFS_FH(inode));
5017         nfs4_stateid_copy(&data->stateid, stateid);
5018         data->res.fattr = &data->fattr;
5019         data->res.server = server;
5020         nfs_fattr_init(data->res.fattr);
5021         data->timestamp = jiffies;
5022         data->rpc_status = 0;
5023
5024         task_setup_data.callback_data = data;
5025         msg.rpc_argp = &data->args;
5026         msg.rpc_resp = &data->res;
5027         task = rpc_run_task(&task_setup_data);
5028         if (IS_ERR(task))
5029                 return PTR_ERR(task);
5030         if (!issync)
5031                 goto out;
5032         status = nfs4_wait_for_completion_rpc_task(task);
5033         if (status != 0)
5034                 goto out;
5035         status = data->rpc_status;
5036         if (status == 0)
5037                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5038         else
5039                 nfs_refresh_inode(inode, &data->fattr);
5040 out:
5041         rpc_put_task(task);
5042         return status;
5043 }
5044
5045 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5046 {
5047         struct nfs_server *server = NFS_SERVER(inode);
5048         struct nfs4_exception exception = { };
5049         int err;
5050         do {
5051                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5052                 trace_nfs4_delegreturn(inode, err);
5053                 switch (err) {
5054                         case -NFS4ERR_STALE_STATEID:
5055                         case -NFS4ERR_EXPIRED:
5056                         case 0:
5057                                 return 0;
5058                 }
5059                 err = nfs4_handle_exception(server, err, &exception);
5060         } while (exception.retry);
5061         return err;
5062 }
5063
5064 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5065 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5066
5067 /*
5068  * sleep, with exponential backoff, and retry the LOCK operation.
5069  */
5070 static unsigned long
5071 nfs4_set_lock_task_retry(unsigned long timeout)
5072 {
5073         freezable_schedule_timeout_killable_unsafe(timeout);
5074         timeout <<= 1;
5075         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5076                 return NFS4_LOCK_MAXTIMEOUT;
5077         return timeout;
5078 }
5079
5080 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5081 {
5082         struct inode *inode = state->inode;
5083         struct nfs_server *server = NFS_SERVER(inode);
5084         struct nfs_client *clp = server->nfs_client;
5085         struct nfs_lockt_args arg = {
5086                 .fh = NFS_FH(inode),
5087                 .fl = request,
5088         };
5089         struct nfs_lockt_res res = {
5090                 .denied = request,
5091         };
5092         struct rpc_message msg = {
5093                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5094                 .rpc_argp       = &arg,
5095                 .rpc_resp       = &res,
5096                 .rpc_cred       = state->owner->so_cred,
5097         };
5098         struct nfs4_lock_state *lsp;
5099         int status;
5100
5101         arg.lock_owner.clientid = clp->cl_clientid;
5102         status = nfs4_set_lock_state(state, request);
5103         if (status != 0)
5104                 goto out;
5105         lsp = request->fl_u.nfs4_fl.owner;
5106         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5107         arg.lock_owner.s_dev = server->s_dev;
5108         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5109         switch (status) {
5110                 case 0:
5111                         request->fl_type = F_UNLCK;
5112                         break;
5113                 case -NFS4ERR_DENIED:
5114                         status = 0;
5115         }
5116         request->fl_ops->fl_release_private(request);
5117         request->fl_ops = NULL;
5118 out:
5119         return status;
5120 }
5121
5122 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5123 {
5124         struct nfs4_exception exception = { };
5125         int err;
5126
5127         do {
5128                 err = _nfs4_proc_getlk(state, cmd, request);
5129                 trace_nfs4_get_lock(request, state, cmd, err);
5130                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5131                                 &exception);
5132         } while (exception.retry);
5133         return err;
5134 }
5135
5136 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5137 {
5138         int res = 0;
5139         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5140                 case FL_POSIX:
5141                         res = posix_lock_file_wait(file, fl);
5142                         break;
5143                 case FL_FLOCK:
5144                         res = flock_lock_file_wait(file, fl);
5145                         break;
5146                 default:
5147                         BUG();
5148         }
5149         return res;
5150 }
5151
5152 struct nfs4_unlockdata {
5153         struct nfs_locku_args arg;
5154         struct nfs_locku_res res;
5155         struct nfs4_lock_state *lsp;
5156         struct nfs_open_context *ctx;
5157         struct file_lock fl;
5158         const struct nfs_server *server;
5159         unsigned long timestamp;
5160 };
5161
5162 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5163                 struct nfs_open_context *ctx,
5164                 struct nfs4_lock_state *lsp,
5165                 struct nfs_seqid *seqid)
5166 {
5167         struct nfs4_unlockdata *p;
5168         struct inode *inode = lsp->ls_state->inode;
5169
5170         p = kzalloc(sizeof(*p), GFP_NOFS);
5171         if (p == NULL)
5172                 return NULL;
5173         p->arg.fh = NFS_FH(inode);
5174         p->arg.fl = &p->fl;
5175         p->arg.seqid = seqid;
5176         p->res.seqid = seqid;
5177         p->arg.stateid = &lsp->ls_stateid;
5178         p->lsp = lsp;
5179         atomic_inc(&lsp->ls_count);
5180         /* Ensure we don't close file until we're done freeing locks! */
5181         p->ctx = get_nfs_open_context(ctx);
5182         memcpy(&p->fl, fl, sizeof(p->fl));
5183         p->server = NFS_SERVER(inode);
5184         return p;
5185 }
5186
5187 static void nfs4_locku_release_calldata(void *data)
5188 {
5189         struct nfs4_unlockdata *calldata = data;
5190         nfs_free_seqid(calldata->arg.seqid);
5191         nfs4_put_lock_state(calldata->lsp);
5192         put_nfs_open_context(calldata->ctx);
5193         kfree(calldata);
5194 }
5195
5196 static void nfs4_locku_done(struct rpc_task *task, void *data)
5197 {
5198         struct nfs4_unlockdata *calldata = data;
5199
5200         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5201                 return;
5202         switch (task->tk_status) {
5203                 case 0:
5204                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5205                                         &calldata->res.stateid);
5206                         renew_lease(calldata->server, calldata->timestamp);
5207                         break;
5208                 case -NFS4ERR_BAD_STATEID:
5209                 case -NFS4ERR_OLD_STATEID:
5210                 case -NFS4ERR_STALE_STATEID:
5211                 case -NFS4ERR_EXPIRED:
5212                         break;
5213                 default:
5214                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5215                                 rpc_restart_call_prepare(task);
5216         }
5217         nfs_release_seqid(calldata->arg.seqid);
5218 }
5219
5220 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5221 {
5222         struct nfs4_unlockdata *calldata = data;
5223
5224         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5225                 goto out_wait;
5226         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5227                 /* Note: exit _without_ running nfs4_locku_done */
5228                 goto out_no_action;
5229         }
5230         calldata->timestamp = jiffies;
5231         if (nfs4_setup_sequence(calldata->server,
5232                                 &calldata->arg.seq_args,
5233                                 &calldata->res.seq_res,
5234                                 task) != 0)
5235                 nfs_release_seqid(calldata->arg.seqid);
5236         return;
5237 out_no_action:
5238         task->tk_action = NULL;
5239 out_wait:
5240         nfs4_sequence_done(task, &calldata->res.seq_res);
5241 }
5242
5243 static const struct rpc_call_ops nfs4_locku_ops = {
5244         .rpc_call_prepare = nfs4_locku_prepare,
5245         .rpc_call_done = nfs4_locku_done,
5246         .rpc_release = nfs4_locku_release_calldata,
5247 };
5248
5249 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5250                 struct nfs_open_context *ctx,
5251                 struct nfs4_lock_state *lsp,
5252                 struct nfs_seqid *seqid)
5253 {
5254         struct nfs4_unlockdata *data;
5255         struct rpc_message msg = {
5256                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5257                 .rpc_cred = ctx->cred,
5258         };
5259         struct rpc_task_setup task_setup_data = {
5260                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5261                 .rpc_message = &msg,
5262                 .callback_ops = &nfs4_locku_ops,
5263                 .workqueue = nfsiod_workqueue,
5264                 .flags = RPC_TASK_ASYNC,
5265         };
5266
5267         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5268                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5269
5270         /* Ensure this is an unlock - when canceling a lock, the
5271          * canceled lock is passed in, and it won't be an unlock.
5272          */
5273         fl->fl_type = F_UNLCK;
5274
5275         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5276         if (data == NULL) {
5277                 nfs_free_seqid(seqid);
5278                 return ERR_PTR(-ENOMEM);
5279         }
5280
5281         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5282         msg.rpc_argp = &data->arg;
5283         msg.rpc_resp = &data->res;
5284         task_setup_data.callback_data = data;
5285         return rpc_run_task(&task_setup_data);
5286 }
5287
5288 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5289 {
5290         struct inode *inode = state->inode;
5291         struct nfs4_state_owner *sp = state->owner;
5292         struct nfs_inode *nfsi = NFS_I(inode);
5293         struct nfs_seqid *seqid;
5294         struct nfs4_lock_state *lsp;
5295         struct rpc_task *task;
5296         int status = 0;
5297         unsigned char fl_flags = request->fl_flags;
5298
5299         status = nfs4_set_lock_state(state, request);
5300         /* Unlock _before_ we do the RPC call */
5301         request->fl_flags |= FL_EXISTS;
5302         /* Exclude nfs_delegation_claim_locks() */
5303         mutex_lock(&sp->so_delegreturn_mutex);
5304         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5305         down_read(&nfsi->rwsem);
5306         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5307                 up_read(&nfsi->rwsem);
5308                 mutex_unlock(&sp->so_delegreturn_mutex);
5309                 goto out;
5310         }
5311         up_read(&nfsi->rwsem);
5312         mutex_unlock(&sp->so_delegreturn_mutex);
5313         if (status != 0)
5314                 goto out;
5315         /* Is this a delegated lock? */
5316         lsp = request->fl_u.nfs4_fl.owner;
5317         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5318                 goto out;
5319         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5320         status = -ENOMEM;
5321         if (seqid == NULL)
5322                 goto out;
5323         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5324         status = PTR_ERR(task);
5325         if (IS_ERR(task))
5326                 goto out;
5327         status = nfs4_wait_for_completion_rpc_task(task);
5328         rpc_put_task(task);
5329 out:
5330         request->fl_flags = fl_flags;
5331         trace_nfs4_unlock(request, state, F_SETLK, status);
5332         return status;
5333 }
5334
5335 struct nfs4_lockdata {
5336         struct nfs_lock_args arg;
5337         struct nfs_lock_res res;
5338         struct nfs4_lock_state *lsp;
5339         struct nfs_open_context *ctx;
5340         struct file_lock fl;
5341         unsigned long timestamp;
5342         int rpc_status;
5343         int cancelled;
5344         struct nfs_server *server;
5345 };
5346
5347 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5348                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5349                 gfp_t gfp_mask)
5350 {
5351         struct nfs4_lockdata *p;
5352         struct inode *inode = lsp->ls_state->inode;
5353         struct nfs_server *server = NFS_SERVER(inode);
5354
5355         p = kzalloc(sizeof(*p), gfp_mask);
5356         if (p == NULL)
5357                 return NULL;
5358
5359         p->arg.fh = NFS_FH(inode);
5360         p->arg.fl = &p->fl;
5361         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5362         if (p->arg.open_seqid == NULL)
5363                 goto out_free;
5364         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5365         if (p->arg.lock_seqid == NULL)
5366                 goto out_free_seqid;
5367         p->arg.lock_stateid = &lsp->ls_stateid;
5368         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5369         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5370         p->arg.lock_owner.s_dev = server->s_dev;
5371         p->res.lock_seqid = p->arg.lock_seqid;
5372         p->lsp = lsp;
5373         p->server = server;
5374         atomic_inc(&lsp->ls_count);
5375         p->ctx = get_nfs_open_context(ctx);
5376         memcpy(&p->fl, fl, sizeof(p->fl));
5377         return p;
5378 out_free_seqid:
5379         nfs_free_seqid(p->arg.open_seqid);
5380 out_free:
5381         kfree(p);
5382         return NULL;
5383 }
5384
5385 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5386 {
5387         struct nfs4_lockdata *data = calldata;
5388         struct nfs4_state *state = data->lsp->ls_state;
5389
5390         dprintk("%s: begin!\n", __func__);
5391         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5392                 goto out_wait;
5393         /* Do we need to do an open_to_lock_owner? */
5394         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5395                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5396                         goto out_release_lock_seqid;
5397                 }
5398                 data->arg.open_stateid = &state->open_stateid;
5399                 data->arg.new_lock_owner = 1;
5400                 data->res.open_seqid = data->arg.open_seqid;
5401         } else
5402                 data->arg.new_lock_owner = 0;
5403         if (!nfs4_valid_open_stateid(state)) {
5404                 data->rpc_status = -EBADF;
5405                 task->tk_action = NULL;
5406                 goto out_release_open_seqid;
5407         }
5408         data->timestamp = jiffies;
5409         if (nfs4_setup_sequence(data->server,
5410                                 &data->arg.seq_args,
5411                                 &data->res.seq_res,
5412                                 task) == 0)
5413                 return;
5414 out_release_open_seqid:
5415         nfs_release_seqid(data->arg.open_seqid);
5416 out_release_lock_seqid:
5417         nfs_release_seqid(data->arg.lock_seqid);
5418 out_wait:
5419         nfs4_sequence_done(task, &data->res.seq_res);
5420         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5421 }
5422
5423 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5424 {
5425         struct nfs4_lockdata *data = calldata;
5426
5427         dprintk("%s: begin!\n", __func__);
5428
5429         if (!nfs4_sequence_done(task, &data->res.seq_res))
5430                 return;
5431
5432         data->rpc_status = task->tk_status;
5433         if (data->arg.new_lock_owner != 0) {
5434                 if (data->rpc_status == 0)
5435                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5436                 else
5437                         goto out;
5438         }
5439         if (data->rpc_status == 0) {
5440                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5441                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5442                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5443         }
5444 out:
5445         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5446 }
5447
5448 static void nfs4_lock_release(void *calldata)
5449 {
5450         struct nfs4_lockdata *data = calldata;
5451
5452         dprintk("%s: begin!\n", __func__);
5453         nfs_free_seqid(data->arg.open_seqid);
5454         if (data->cancelled != 0) {
5455                 struct rpc_task *task;
5456                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5457                                 data->arg.lock_seqid);
5458                 if (!IS_ERR(task))
5459                         rpc_put_task_async(task);
5460                 dprintk("%s: cancelling lock!\n", __func__);
5461         } else
5462                 nfs_free_seqid(data->arg.lock_seqid);
5463         nfs4_put_lock_state(data->lsp);
5464         put_nfs_open_context(data->ctx);
5465         kfree(data);
5466         dprintk("%s: done!\n", __func__);
5467 }
5468
5469 static const struct rpc_call_ops nfs4_lock_ops = {
5470         .rpc_call_prepare = nfs4_lock_prepare,
5471         .rpc_call_done = nfs4_lock_done,
5472         .rpc_release = nfs4_lock_release,
5473 };
5474
5475 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5476 {
5477         switch (error) {
5478         case -NFS4ERR_ADMIN_REVOKED:
5479         case -NFS4ERR_BAD_STATEID:
5480                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5481                 if (new_lock_owner != 0 ||
5482                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5483                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5484                 break;
5485         case -NFS4ERR_STALE_STATEID:
5486                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5487         case -NFS4ERR_EXPIRED:
5488                 nfs4_schedule_lease_recovery(server->nfs_client);
5489         };
5490 }
5491
5492 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5493 {
5494         struct nfs4_lockdata *data;
5495         struct rpc_task *task;
5496         struct rpc_message msg = {
5497                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5498                 .rpc_cred = state->owner->so_cred,
5499         };
5500         struct rpc_task_setup task_setup_data = {
5501                 .rpc_client = NFS_CLIENT(state->inode),
5502                 .rpc_message = &msg,
5503                 .callback_ops = &nfs4_lock_ops,
5504                 .workqueue = nfsiod_workqueue,
5505                 .flags = RPC_TASK_ASYNC,
5506         };
5507         int ret;
5508
5509         dprintk("%s: begin!\n", __func__);
5510         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5511                         fl->fl_u.nfs4_fl.owner,
5512                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5513         if (data == NULL)
5514                 return -ENOMEM;
5515         if (IS_SETLKW(cmd))
5516                 data->arg.block = 1;
5517         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5518         msg.rpc_argp = &data->arg;
5519         msg.rpc_resp = &data->res;
5520         task_setup_data.callback_data = data;
5521         if (recovery_type > NFS_LOCK_NEW) {
5522                 if (recovery_type == NFS_LOCK_RECLAIM)
5523                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5524                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5525         }
5526         task = rpc_run_task(&task_setup_data);
5527         if (IS_ERR(task))
5528                 return PTR_ERR(task);
5529         ret = nfs4_wait_for_completion_rpc_task(task);
5530         if (ret == 0) {
5531                 ret = data->rpc_status;
5532                 if (ret)
5533                         nfs4_handle_setlk_error(data->server, data->lsp,
5534                                         data->arg.new_lock_owner, ret);
5535         } else
5536                 data->cancelled = 1;
5537         rpc_put_task(task);
5538         dprintk("%s: done, ret = %d!\n", __func__, ret);
5539         return ret;
5540 }
5541
5542 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5543 {
5544         struct nfs_server *server = NFS_SERVER(state->inode);
5545         struct nfs4_exception exception = {
5546                 .inode = state->inode,
5547         };
5548         int err;
5549
5550         do {
5551                 /* Cache the lock if possible... */
5552                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5553                         return 0;
5554                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5555                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5556                 if (err != -NFS4ERR_DELAY)
5557                         break;
5558                 nfs4_handle_exception(server, err, &exception);
5559         } while (exception.retry);
5560         return err;
5561 }
5562
5563 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5564 {
5565         struct nfs_server *server = NFS_SERVER(state->inode);
5566         struct nfs4_exception exception = {
5567                 .inode = state->inode,
5568         };
5569         int err;
5570
5571         err = nfs4_set_lock_state(state, request);
5572         if (err != 0)
5573                 return err;
5574         if (!recover_lost_locks) {
5575                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5576                 return 0;
5577         }
5578         do {
5579                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5580                         return 0;
5581                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5582                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5583                 switch (err) {
5584                 default:
5585                         goto out;
5586                 case -NFS4ERR_GRACE:
5587                 case -NFS4ERR_DELAY:
5588                         nfs4_handle_exception(server, err, &exception);
5589                         err = 0;
5590                 }
5591         } while (exception.retry);
5592 out:
5593         return err;
5594 }
5595
5596 #if defined(CONFIG_NFS_V4_1)
5597 /**
5598  * nfs41_check_expired_locks - possibly free a lock stateid
5599  *
5600  * @state: NFSv4 state for an inode
5601  *
5602  * Returns NFS_OK if recovery for this stateid is now finished.
5603  * Otherwise a negative NFS4ERR value is returned.
5604  */
5605 static int nfs41_check_expired_locks(struct nfs4_state *state)
5606 {
5607         int status, ret = -NFS4ERR_BAD_STATEID;
5608         struct nfs4_lock_state *lsp;
5609         struct nfs_server *server = NFS_SERVER(state->inode);
5610
5611         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5612                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5613                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5614
5615                         status = nfs41_test_stateid(server,
5616                                         &lsp->ls_stateid,
5617                                         cred);
5618                         trace_nfs4_test_lock_stateid(state, lsp, status);
5619                         if (status != NFS_OK) {
5620                                 /* Free the stateid unless the server
5621                                  * informs us the stateid is unrecognized. */
5622                                 if (status != -NFS4ERR_BAD_STATEID)
5623                                         nfs41_free_stateid(server,
5624                                                         &lsp->ls_stateid,
5625                                                         cred);
5626                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5627                                 ret = status;
5628                         }
5629                 }
5630         };
5631
5632         return ret;
5633 }
5634
5635 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5636 {
5637         int status = NFS_OK;
5638
5639         if (test_bit(LK_STATE_IN_USE, &state->flags))
5640                 status = nfs41_check_expired_locks(state);
5641         if (status != NFS_OK)
5642                 status = nfs4_lock_expired(state, request);
5643         return status;
5644 }
5645 #endif
5646
5647 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5648 {
5649         struct nfs4_state_owner *sp = state->owner;
5650         struct nfs_inode *nfsi = NFS_I(state->inode);
5651         unsigned char fl_flags = request->fl_flags;
5652         unsigned int seq;
5653         int status = -ENOLCK;
5654
5655         if ((fl_flags & FL_POSIX) &&
5656                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5657                 goto out;
5658         /* Is this a delegated open? */
5659         status = nfs4_set_lock_state(state, request);
5660         if (status != 0)
5661                 goto out;
5662         request->fl_flags |= FL_ACCESS;
5663         status = do_vfs_lock(request->fl_file, request);
5664         if (status < 0)
5665                 goto out;
5666         down_read(&nfsi->rwsem);
5667         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5668                 /* Yes: cache locks! */
5669                 /* ...but avoid races with delegation recall... */
5670                 request->fl_flags = fl_flags & ~FL_SLEEP;
5671                 status = do_vfs_lock(request->fl_file, request);
5672                 goto out_unlock;
5673         }
5674         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5675         up_read(&nfsi->rwsem);
5676         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5677         if (status != 0)
5678                 goto out;
5679         down_read(&nfsi->rwsem);
5680         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5681                 status = -NFS4ERR_DELAY;
5682                 goto out_unlock;
5683         }
5684         /* Note: we always want to sleep here! */
5685         request->fl_flags = fl_flags | FL_SLEEP;
5686         if (do_vfs_lock(request->fl_file, request) < 0)
5687                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5688                         "manager!\n", __func__);
5689 out_unlock:
5690         up_read(&nfsi->rwsem);
5691 out:
5692         request->fl_flags = fl_flags;
5693         return status;
5694 }
5695
5696 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5697 {
5698         struct nfs4_exception exception = {
5699                 .state = state,
5700                 .inode = state->inode,
5701         };
5702         int err;
5703
5704         do {
5705                 err = _nfs4_proc_setlk(state, cmd, request);
5706                 trace_nfs4_set_lock(request, state, cmd, err);
5707                 if (err == -NFS4ERR_DENIED)
5708                         err = -EAGAIN;
5709                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5710                                 err, &exception);
5711         } while (exception.retry);
5712         return err;
5713 }
5714
5715 static int
5716 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5717 {
5718         struct nfs_open_context *ctx;
5719         struct nfs4_state *state;
5720         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5721         int status;
5722
5723         /* verify open state */
5724         ctx = nfs_file_open_context(filp);
5725         state = ctx->state;
5726
5727         if (request->fl_start < 0 || request->fl_end < 0)
5728                 return -EINVAL;
5729
5730         if (IS_GETLK(cmd)) {
5731                 if (state != NULL)
5732                         return nfs4_proc_getlk(state, F_GETLK, request);
5733                 return 0;
5734         }
5735
5736         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5737                 return -EINVAL;
5738
5739         if (request->fl_type == F_UNLCK) {
5740                 if (state != NULL)
5741                         return nfs4_proc_unlck(state, cmd, request);
5742                 return 0;
5743         }
5744
5745         if (state == NULL)
5746                 return -ENOLCK;
5747         /*
5748          * Don't rely on the VFS having checked the file open mode,
5749          * since it won't do this for flock() locks.
5750          */
5751         switch (request->fl_type) {
5752         case F_RDLCK:
5753                 if (!(filp->f_mode & FMODE_READ))
5754                         return -EBADF;
5755                 break;
5756         case F_WRLCK:
5757                 if (!(filp->f_mode & FMODE_WRITE))
5758                         return -EBADF;
5759         }
5760
5761         do {
5762                 status = nfs4_proc_setlk(state, cmd, request);
5763                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5764                         break;
5765                 timeout = nfs4_set_lock_task_retry(timeout);
5766                 status = -ERESTARTSYS;
5767                 if (signalled())
5768                         break;
5769         } while(status < 0);
5770         return status;
5771 }
5772
5773 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5774 {
5775         struct nfs_server *server = NFS_SERVER(state->inode);
5776         int err;
5777
5778         err = nfs4_set_lock_state(state, fl);
5779         if (err != 0)
5780                 return err;
5781         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5782         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5783 }
5784
5785 struct nfs_release_lockowner_data {
5786         struct nfs4_lock_state *lsp;
5787         struct nfs_server *server;
5788         struct nfs_release_lockowner_args args;
5789         struct nfs4_sequence_args seq_args;
5790         struct nfs4_sequence_res seq_res;
5791 };
5792
5793 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5794 {
5795         struct nfs_release_lockowner_data *data = calldata;
5796         nfs40_setup_sequence(data->server,
5797                                 &data->seq_args, &data->seq_res, task);
5798 }
5799
5800 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5801 {
5802         struct nfs_release_lockowner_data *data = calldata;
5803         nfs40_sequence_done(task, &data->seq_res);
5804 }
5805
5806 static void nfs4_release_lockowner_release(void *calldata)
5807 {
5808         struct nfs_release_lockowner_data *data = calldata;
5809         nfs4_free_lock_state(data->server, data->lsp);
5810         kfree(calldata);
5811 }
5812
5813 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5814         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5815         .rpc_call_done = nfs4_release_lockowner_done,
5816         .rpc_release = nfs4_release_lockowner_release,
5817 };
5818
5819 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5820 {
5821         struct nfs_release_lockowner_data *data;
5822         struct rpc_message msg = {
5823                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5824         };
5825
5826         if (server->nfs_client->cl_mvops->minor_version != 0)
5827                 return -EINVAL;
5828
5829         data = kmalloc(sizeof(*data), GFP_NOFS);
5830         if (!data)
5831                 return -ENOMEM;
5832         nfs4_init_sequence(&data->seq_args, &data->seq_res, 0);
5833         data->lsp = lsp;
5834         data->server = server;
5835         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5836         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5837         data->args.lock_owner.s_dev = server->s_dev;
5838
5839         msg.rpc_argp = &data->args;
5840         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5841         return 0;
5842 }
5843
5844 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5845
5846 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5847                                    const void *buf, size_t buflen,
5848                                    int flags, int type)
5849 {
5850         if (strcmp(key, "") != 0)
5851                 return -EINVAL;
5852
5853         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5854 }
5855
5856 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5857                                    void *buf, size_t buflen, int type)
5858 {
5859         if (strcmp(key, "") != 0)
5860                 return -EINVAL;
5861
5862         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5863 }
5864
5865 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5866                                        size_t list_len, const char *name,
5867                                        size_t name_len, int type)
5868 {
5869         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5870
5871         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5872                 return 0;
5873
5874         if (list && len <= list_len)
5875                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5876         return len;
5877 }
5878
5879 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5880 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5881 {
5882         return server->caps & NFS_CAP_SECURITY_LABEL;
5883 }
5884
5885 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5886                                    const void *buf, size_t buflen,
5887                                    int flags, int type)
5888 {
5889         if (security_ismaclabel(key))
5890                 return nfs4_set_security_label(dentry, buf, buflen);
5891
5892         return -EOPNOTSUPP;
5893 }
5894
5895 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5896                                    void *buf, size_t buflen, int type)
5897 {
5898         if (security_ismaclabel(key))
5899                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5900         return -EOPNOTSUPP;
5901 }
5902
5903 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5904                                        size_t list_len, const char *name,
5905                                        size_t name_len, int type)
5906 {
5907         size_t len = 0;
5908
5909         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5910                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5911                 if (list && len <= list_len)
5912                         security_inode_listsecurity(dentry->d_inode, list, len);
5913         }
5914         return len;
5915 }
5916
5917 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5918         .prefix = XATTR_SECURITY_PREFIX,
5919         .list   = nfs4_xattr_list_nfs4_label,
5920         .get    = nfs4_xattr_get_nfs4_label,
5921         .set    = nfs4_xattr_set_nfs4_label,
5922 };
5923 #endif
5924
5925
5926 /*
5927  * nfs_fhget will use either the mounted_on_fileid or the fileid
5928  */
5929 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5930 {
5931         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5932                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5933               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5934               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5935                 return;
5936
5937         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5938                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5939         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5940         fattr->nlink = 2;
5941 }
5942
5943 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5944                                    const struct qstr *name,
5945                                    struct nfs4_fs_locations *fs_locations,
5946                                    struct page *page)
5947 {
5948         struct nfs_server *server = NFS_SERVER(dir);
5949         u32 bitmask[3] = {
5950                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5951         };
5952         struct nfs4_fs_locations_arg args = {
5953                 .dir_fh = NFS_FH(dir),
5954                 .name = name,
5955                 .page = page,
5956                 .bitmask = bitmask,
5957         };
5958         struct nfs4_fs_locations_res res = {
5959                 .fs_locations = fs_locations,
5960         };
5961         struct rpc_message msg = {
5962                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5963                 .rpc_argp = &args,
5964                 .rpc_resp = &res,
5965         };
5966         int status;
5967
5968         dprintk("%s: start\n", __func__);
5969
5970         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5971          * is not supported */
5972         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5973                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5974         else
5975                 bitmask[0] |= FATTR4_WORD0_FILEID;
5976
5977         nfs_fattr_init(&fs_locations->fattr);
5978         fs_locations->server = server;
5979         fs_locations->nlocations = 0;
5980         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5981         dprintk("%s: returned status = %d\n", __func__, status);
5982         return status;
5983 }
5984
5985 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5986                            const struct qstr *name,
5987                            struct nfs4_fs_locations *fs_locations,
5988                            struct page *page)
5989 {
5990         struct nfs4_exception exception = { };
5991         int err;
5992         do {
5993                 err = _nfs4_proc_fs_locations(client, dir, name,
5994                                 fs_locations, page);
5995                 trace_nfs4_get_fs_locations(dir, name, err);
5996                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5997                                 &exception);
5998         } while (exception.retry);
5999         return err;
6000 }
6001
6002 /*
6003  * This operation also signals the server that this client is
6004  * performing migration recovery.  The server can stop returning
6005  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6006  * appended to this compound to identify the client ID which is
6007  * performing recovery.
6008  */
6009 static int _nfs40_proc_get_locations(struct inode *inode,
6010                                      struct nfs4_fs_locations *locations,
6011                                      struct page *page, struct rpc_cred *cred)
6012 {
6013         struct nfs_server *server = NFS_SERVER(inode);
6014         struct rpc_clnt *clnt = server->client;
6015         u32 bitmask[2] = {
6016                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6017         };
6018         struct nfs4_fs_locations_arg args = {
6019                 .clientid       = server->nfs_client->cl_clientid,
6020                 .fh             = NFS_FH(inode),
6021                 .page           = page,
6022                 .bitmask        = bitmask,
6023                 .migration      = 1,            /* skip LOOKUP */
6024                 .renew          = 1,            /* append RENEW */
6025         };
6026         struct nfs4_fs_locations_res res = {
6027                 .fs_locations   = locations,
6028                 .migration      = 1,
6029                 .renew          = 1,
6030         };
6031         struct rpc_message msg = {
6032                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6033                 .rpc_argp       = &args,
6034                 .rpc_resp       = &res,
6035                 .rpc_cred       = cred,
6036         };
6037         unsigned long now = jiffies;
6038         int status;
6039
6040         nfs_fattr_init(&locations->fattr);
6041         locations->server = server;
6042         locations->nlocations = 0;
6043
6044         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6045         nfs4_set_sequence_privileged(&args.seq_args);
6046         status = nfs4_call_sync_sequence(clnt, server, &msg,
6047                                         &args.seq_args, &res.seq_res);
6048         if (status)
6049                 return status;
6050
6051         renew_lease(server, now);
6052         return 0;
6053 }
6054
6055 #ifdef CONFIG_NFS_V4_1
6056
6057 /*
6058  * This operation also signals the server that this client is
6059  * performing migration recovery.  The server can stop asserting
6060  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6061  * performing this operation is identified in the SEQUENCE
6062  * operation in this compound.
6063  *
6064  * When the client supports GETATTR(fs_locations_info), it can
6065  * be plumbed in here.
6066  */
6067 static int _nfs41_proc_get_locations(struct inode *inode,
6068                                      struct nfs4_fs_locations *locations,
6069                                      struct page *page, struct rpc_cred *cred)
6070 {
6071         struct nfs_server *server = NFS_SERVER(inode);
6072         struct rpc_clnt *clnt = server->client;
6073         u32 bitmask[2] = {
6074                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6075         };
6076         struct nfs4_fs_locations_arg args = {
6077                 .fh             = NFS_FH(inode),
6078                 .page           = page,
6079                 .bitmask        = bitmask,
6080                 .migration      = 1,            /* skip LOOKUP */
6081         };
6082         struct nfs4_fs_locations_res res = {
6083                 .fs_locations   = locations,
6084                 .migration      = 1,
6085         };
6086         struct rpc_message msg = {
6087                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6088                 .rpc_argp       = &args,
6089                 .rpc_resp       = &res,
6090                 .rpc_cred       = cred,
6091         };
6092         int status;
6093
6094         nfs_fattr_init(&locations->fattr);
6095         locations->server = server;
6096         locations->nlocations = 0;
6097
6098         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6099         nfs4_set_sequence_privileged(&args.seq_args);
6100         status = nfs4_call_sync_sequence(clnt, server, &msg,
6101                                         &args.seq_args, &res.seq_res);
6102         if (status == NFS4_OK &&
6103             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6104                 status = -NFS4ERR_LEASE_MOVED;
6105         return status;
6106 }
6107
6108 #endif  /* CONFIG_NFS_V4_1 */
6109
6110 /**
6111  * nfs4_proc_get_locations - discover locations for a migrated FSID
6112  * @inode: inode on FSID that is migrating
6113  * @locations: result of query
6114  * @page: buffer
6115  * @cred: credential to use for this operation
6116  *
6117  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6118  * operation failed, or a negative errno if a local error occurred.
6119  *
6120  * On success, "locations" is filled in, but if the server has
6121  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6122  * asserted.
6123  *
6124  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6125  * from this client that require migration recovery.
6126  */
6127 int nfs4_proc_get_locations(struct inode *inode,
6128                             struct nfs4_fs_locations *locations,
6129                             struct page *page, struct rpc_cred *cred)
6130 {
6131         struct nfs_server *server = NFS_SERVER(inode);
6132         struct nfs_client *clp = server->nfs_client;
6133         const struct nfs4_mig_recovery_ops *ops =
6134                                         clp->cl_mvops->mig_recovery_ops;
6135         struct nfs4_exception exception = { };
6136         int status;
6137
6138         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6139                 (unsigned long long)server->fsid.major,
6140                 (unsigned long long)server->fsid.minor,
6141                 clp->cl_hostname);
6142         nfs_display_fhandle(NFS_FH(inode), __func__);
6143
6144         do {
6145                 status = ops->get_locations(inode, locations, page, cred);
6146                 if (status != -NFS4ERR_DELAY)
6147                         break;
6148                 nfs4_handle_exception(server, status, &exception);
6149         } while (exception.retry);
6150         return status;
6151 }
6152
6153 /**
6154  * If 'use_integrity' is true and the state managment nfs_client
6155  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6156  * and the machine credential as per RFC3530bis and RFC5661 Security
6157  * Considerations sections. Otherwise, just use the user cred with the
6158  * filesystem's rpc_client.
6159  */
6160 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6161 {
6162         int status;
6163         struct nfs4_secinfo_arg args = {
6164                 .dir_fh = NFS_FH(dir),
6165                 .name   = name,
6166         };
6167         struct nfs4_secinfo_res res = {
6168                 .flavors     = flavors,
6169         };
6170         struct rpc_message msg = {
6171                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6172                 .rpc_argp = &args,
6173                 .rpc_resp = &res,
6174         };
6175         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6176         struct rpc_cred *cred = NULL;
6177
6178         if (use_integrity) {
6179                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6180                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6181                 msg.rpc_cred = cred;
6182         }
6183
6184         dprintk("NFS call  secinfo %s\n", name->name);
6185
6186         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6187                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6188
6189         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6190                                 &res.seq_res, 0);
6191         dprintk("NFS reply  secinfo: %d\n", status);
6192
6193         if (cred)
6194                 put_rpccred(cred);
6195
6196         return status;
6197 }
6198
6199 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6200                       struct nfs4_secinfo_flavors *flavors)
6201 {
6202         struct nfs4_exception exception = { };
6203         int err;
6204         do {
6205                 err = -NFS4ERR_WRONGSEC;
6206
6207                 /* try to use integrity protection with machine cred */
6208                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6209                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6210
6211                 /*
6212                  * if unable to use integrity protection, or SECINFO with
6213                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6214                  * disallowed by spec, but exists in deployed servers) use
6215                  * the current filesystem's rpc_client and the user cred.
6216                  */
6217                 if (err == -NFS4ERR_WRONGSEC)
6218                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6219
6220                 trace_nfs4_secinfo(dir, name, err);
6221                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6222                                 &exception);
6223         } while (exception.retry);
6224         return err;
6225 }
6226
6227 #ifdef CONFIG_NFS_V4_1
6228 /*
6229  * Check the exchange flags returned by the server for invalid flags, having
6230  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6231  * DS flags set.
6232  */
6233 static int nfs4_check_cl_exchange_flags(u32 flags)
6234 {
6235         if (flags & ~EXCHGID4_FLAG_MASK_R)
6236                 goto out_inval;
6237         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6238             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6239                 goto out_inval;
6240         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6241                 goto out_inval;
6242         return NFS_OK;
6243 out_inval:
6244         return -NFS4ERR_INVAL;
6245 }
6246
6247 static bool
6248 nfs41_same_server_scope(struct nfs41_server_scope *a,
6249                         struct nfs41_server_scope *b)
6250 {
6251         if (a->server_scope_sz == b->server_scope_sz &&
6252             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6253                 return true;
6254
6255         return false;
6256 }
6257
6258 /*
6259  * nfs4_proc_bind_conn_to_session()
6260  *
6261  * The 4.1 client currently uses the same TCP connection for the
6262  * fore and backchannel.
6263  */
6264 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6265 {
6266         int status;
6267         struct nfs41_bind_conn_to_session_res res;
6268         struct rpc_message msg = {
6269                 .rpc_proc =
6270                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6271                 .rpc_argp = clp,
6272                 .rpc_resp = &res,
6273                 .rpc_cred = cred,
6274         };
6275
6276         dprintk("--> %s\n", __func__);
6277
6278         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6279         if (unlikely(res.session == NULL)) {
6280                 status = -ENOMEM;
6281                 goto out;
6282         }
6283
6284         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6285         trace_nfs4_bind_conn_to_session(clp, status);
6286         if (status == 0) {
6287                 if (memcmp(res.session->sess_id.data,
6288                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6289                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6290                         status = -EIO;
6291                         goto out_session;
6292                 }
6293                 if (res.dir != NFS4_CDFS4_BOTH) {
6294                         dprintk("NFS: %s: Unexpected direction from server\n",
6295                                 __func__);
6296                         status = -EIO;
6297                         goto out_session;
6298                 }
6299                 if (res.use_conn_in_rdma_mode) {
6300                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6301                                 __func__);
6302                         status = -EIO;
6303                         goto out_session;
6304                 }
6305         }
6306 out_session:
6307         kfree(res.session);
6308 out:
6309         dprintk("<-- %s status= %d\n", __func__, status);
6310         return status;
6311 }
6312
6313 /*
6314  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6315  * and operations we'd like to see to enable certain features in the allow map
6316  */
6317 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6318         .how = SP4_MACH_CRED,
6319         .enforce.u.words = {
6320                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6321                       1 << (OP_EXCHANGE_ID - 32) |
6322                       1 << (OP_CREATE_SESSION - 32) |
6323                       1 << (OP_DESTROY_SESSION - 32) |
6324                       1 << (OP_DESTROY_CLIENTID - 32)
6325         },
6326         .allow.u.words = {
6327                 [0] = 1 << (OP_CLOSE) |
6328                       1 << (OP_LOCKU) |
6329                       1 << (OP_COMMIT),
6330                 [1] = 1 << (OP_SECINFO - 32) |
6331                       1 << (OP_SECINFO_NO_NAME - 32) |
6332                       1 << (OP_TEST_STATEID - 32) |
6333                       1 << (OP_FREE_STATEID - 32) |
6334                       1 << (OP_WRITE - 32)
6335         }
6336 };
6337
6338 /*
6339  * Select the state protection mode for client `clp' given the server results
6340  * from exchange_id in `sp'.
6341  *
6342  * Returns 0 on success, negative errno otherwise.
6343  */
6344 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6345                                  struct nfs41_state_protection *sp)
6346 {
6347         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6348                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6349                       1 << (OP_EXCHANGE_ID - 32) |
6350                       1 << (OP_CREATE_SESSION - 32) |
6351                       1 << (OP_DESTROY_SESSION - 32) |
6352                       1 << (OP_DESTROY_CLIENTID - 32)
6353         };
6354         unsigned int i;
6355
6356         if (sp->how == SP4_MACH_CRED) {
6357                 /* Print state protect result */
6358                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6359                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6360                         if (test_bit(i, sp->enforce.u.longs))
6361                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6362                         if (test_bit(i, sp->allow.u.longs))
6363                                 dfprintk(MOUNT, "  allow op %d\n", i);
6364                 }
6365
6366                 /* make sure nothing is on enforce list that isn't supported */
6367                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6368                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6369                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6370                                 return -EINVAL;
6371                         }
6372                 }
6373
6374                 /*
6375                  * Minimal mode - state operations are allowed to use machine
6376                  * credential.  Note this already happens by default, so the
6377                  * client doesn't have to do anything more than the negotiation.
6378                  *
6379                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6380                  *       we're already using the machine cred for exchange_id
6381                  *       and will never use a different cred.
6382                  */
6383                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6384                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6385                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6386                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6387                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6388                         dfprintk(MOUNT, "  minimal mode enabled\n");
6389                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6390                 } else {
6391                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6392                         return -EINVAL;
6393                 }
6394
6395                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6396                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6397                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6398                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6399                 }
6400
6401                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6402                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6403                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6404                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6405                 }
6406
6407                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6408                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6409                         dfprintk(MOUNT, "  stateid mode enabled\n");
6410                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6411                 }
6412
6413                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6414                         dfprintk(MOUNT, "  write mode enabled\n");
6415                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6416                 }
6417
6418                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6419                         dfprintk(MOUNT, "  commit mode enabled\n");
6420                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6421                 }
6422         }
6423
6424         return 0;
6425 }
6426
6427 /*
6428  * _nfs4_proc_exchange_id()
6429  *
6430  * Wrapper for EXCHANGE_ID operation.
6431  */
6432 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6433         u32 sp4_how)
6434 {
6435         nfs4_verifier verifier;
6436         struct nfs41_exchange_id_args args = {
6437                 .verifier = &verifier,
6438                 .client = clp,
6439                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6440                         EXCHGID4_FLAG_BIND_PRINC_STATEID,
6441         };
6442         struct nfs41_exchange_id_res res = {
6443                 0
6444         };
6445         int status;
6446         struct rpc_message msg = {
6447                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6448                 .rpc_argp = &args,
6449                 .rpc_resp = &res,
6450                 .rpc_cred = cred,
6451         };
6452
6453         nfs4_init_boot_verifier(clp, &verifier);
6454         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6455                                                         sizeof(args.id));
6456         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6457                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6458                 args.id_len, args.id);
6459
6460         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6461                                         GFP_NOFS);
6462         if (unlikely(res.server_owner == NULL)) {
6463                 status = -ENOMEM;
6464                 goto out;
6465         }
6466
6467         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6468                                         GFP_NOFS);
6469         if (unlikely(res.server_scope == NULL)) {
6470                 status = -ENOMEM;
6471                 goto out_server_owner;
6472         }
6473
6474         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6475         if (unlikely(res.impl_id == NULL)) {
6476                 status = -ENOMEM;
6477                 goto out_server_scope;
6478         }
6479
6480         switch (sp4_how) {
6481         case SP4_NONE:
6482                 args.state_protect.how = SP4_NONE;
6483                 break;
6484
6485         case SP4_MACH_CRED:
6486                 args.state_protect = nfs4_sp4_mach_cred_request;
6487                 break;
6488
6489         default:
6490                 /* unsupported! */
6491                 WARN_ON_ONCE(1);
6492                 status = -EINVAL;
6493                 goto out_server_scope;
6494         }
6495
6496         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6497         trace_nfs4_exchange_id(clp, status);
6498         if (status == 0)
6499                 status = nfs4_check_cl_exchange_flags(res.flags);
6500
6501         if (status == 0)
6502                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6503
6504         if (status == 0) {
6505                 clp->cl_clientid = res.clientid;
6506                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6507                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6508                         clp->cl_seqid = res.seqid;
6509
6510                 kfree(clp->cl_serverowner);
6511                 clp->cl_serverowner = res.server_owner;
6512                 res.server_owner = NULL;
6513
6514                 /* use the most recent implementation id */
6515                 kfree(clp->cl_implid);
6516                 clp->cl_implid = res.impl_id;
6517
6518                 if (clp->cl_serverscope != NULL &&
6519                     !nfs41_same_server_scope(clp->cl_serverscope,
6520                                              res.server_scope)) {
6521                         dprintk("%s: server_scope mismatch detected\n",
6522                                 __func__);
6523                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6524                         kfree(clp->cl_serverscope);
6525                         clp->cl_serverscope = NULL;
6526                 }
6527
6528                 if (clp->cl_serverscope == NULL) {
6529                         clp->cl_serverscope = res.server_scope;
6530                         goto out;
6531                 }
6532         } else
6533                 kfree(res.impl_id);
6534
6535 out_server_owner:
6536         kfree(res.server_owner);
6537 out_server_scope:
6538         kfree(res.server_scope);
6539 out:
6540         if (clp->cl_implid != NULL)
6541                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6542                         "domain: %s, name: %s, date: %llu,%u\n",
6543                         clp->cl_implid->domain, clp->cl_implid->name,
6544                         clp->cl_implid->date.seconds,
6545                         clp->cl_implid->date.nseconds);
6546         dprintk("NFS reply exchange_id: %d\n", status);
6547         return status;
6548 }
6549
6550 /*
6551  * nfs4_proc_exchange_id()
6552  *
6553  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6554  *
6555  * Since the clientid has expired, all compounds using sessions
6556  * associated with the stale clientid will be returning
6557  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6558  * be in some phase of session reset.
6559  *
6560  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6561  */
6562 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6563 {
6564         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6565         int status;
6566
6567         /* try SP4_MACH_CRED if krb5i/p */
6568         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6569             authflavor == RPC_AUTH_GSS_KRB5P) {
6570                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6571                 if (!status)
6572                         return 0;
6573         }
6574
6575         /* try SP4_NONE */
6576         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6577 }
6578
6579 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6580                 struct rpc_cred *cred)
6581 {
6582         struct rpc_message msg = {
6583                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6584                 .rpc_argp = clp,
6585                 .rpc_cred = cred,
6586         };
6587         int status;
6588
6589         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6590         trace_nfs4_destroy_clientid(clp, status);
6591         if (status)
6592                 dprintk("NFS: Got error %d from the server %s on "
6593                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6594         return status;
6595 }
6596
6597 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6598                 struct rpc_cred *cred)
6599 {
6600         unsigned int loop;
6601         int ret;
6602
6603         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6604                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6605                 switch (ret) {
6606                 case -NFS4ERR_DELAY:
6607                 case -NFS4ERR_CLIENTID_BUSY:
6608                         ssleep(1);
6609                         break;
6610                 default:
6611                         return ret;
6612                 }
6613         }
6614         return 0;
6615 }
6616
6617 int nfs4_destroy_clientid(struct nfs_client *clp)
6618 {
6619         struct rpc_cred *cred;
6620         int ret = 0;
6621
6622         if (clp->cl_mvops->minor_version < 1)
6623                 goto out;
6624         if (clp->cl_exchange_flags == 0)
6625                 goto out;
6626         if (clp->cl_preserve_clid)
6627                 goto out;
6628         cred = nfs4_get_clid_cred(clp);
6629         ret = nfs4_proc_destroy_clientid(clp, cred);
6630         if (cred)
6631                 put_rpccred(cred);
6632         switch (ret) {
6633         case 0:
6634         case -NFS4ERR_STALE_CLIENTID:
6635                 clp->cl_exchange_flags = 0;
6636         }
6637 out:
6638         return ret;
6639 }
6640
6641 struct nfs4_get_lease_time_data {
6642         struct nfs4_get_lease_time_args *args;
6643         struct nfs4_get_lease_time_res *res;
6644         struct nfs_client *clp;
6645 };
6646
6647 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6648                                         void *calldata)
6649 {
6650         struct nfs4_get_lease_time_data *data =
6651                         (struct nfs4_get_lease_time_data *)calldata;
6652
6653         dprintk("--> %s\n", __func__);
6654         /* just setup sequence, do not trigger session recovery
6655            since we're invoked within one */
6656         nfs41_setup_sequence(data->clp->cl_session,
6657                         &data->args->la_seq_args,
6658                         &data->res->lr_seq_res,
6659                         task);
6660         dprintk("<-- %s\n", __func__);
6661 }
6662
6663 /*
6664  * Called from nfs4_state_manager thread for session setup, so don't recover
6665  * from sequence operation or clientid errors.
6666  */
6667 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6668 {
6669         struct nfs4_get_lease_time_data *data =
6670                         (struct nfs4_get_lease_time_data *)calldata;
6671
6672         dprintk("--> %s\n", __func__);
6673         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6674                 return;
6675         switch (task->tk_status) {
6676         case -NFS4ERR_DELAY:
6677         case -NFS4ERR_GRACE:
6678                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6679                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6680                 task->tk_status = 0;
6681                 /* fall through */
6682         case -NFS4ERR_RETRY_UNCACHED_REP:
6683                 rpc_restart_call_prepare(task);
6684                 return;
6685         }
6686         dprintk("<-- %s\n", __func__);
6687 }
6688
6689 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6690         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6691         .rpc_call_done = nfs4_get_lease_time_done,
6692 };
6693
6694 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6695 {
6696         struct rpc_task *task;
6697         struct nfs4_get_lease_time_args args;
6698         struct nfs4_get_lease_time_res res = {
6699                 .lr_fsinfo = fsinfo,
6700         };
6701         struct nfs4_get_lease_time_data data = {
6702                 .args = &args,
6703                 .res = &res,
6704                 .clp = clp,
6705         };
6706         struct rpc_message msg = {
6707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6708                 .rpc_argp = &args,
6709                 .rpc_resp = &res,
6710         };
6711         struct rpc_task_setup task_setup = {
6712                 .rpc_client = clp->cl_rpcclient,
6713                 .rpc_message = &msg,
6714                 .callback_ops = &nfs4_get_lease_time_ops,
6715                 .callback_data = &data,
6716                 .flags = RPC_TASK_TIMEOUT,
6717         };
6718         int status;
6719
6720         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6721         nfs4_set_sequence_privileged(&args.la_seq_args);
6722         dprintk("--> %s\n", __func__);
6723         task = rpc_run_task(&task_setup);
6724
6725         if (IS_ERR(task))
6726                 status = PTR_ERR(task);
6727         else {
6728                 status = task->tk_status;
6729                 rpc_put_task(task);
6730         }
6731         dprintk("<-- %s return %d\n", __func__, status);
6732
6733         return status;
6734 }
6735
6736 /*
6737  * Initialize the values to be used by the client in CREATE_SESSION
6738  * If nfs4_init_session set the fore channel request and response sizes,
6739  * use them.
6740  *
6741  * Set the back channel max_resp_sz_cached to zero to force the client to
6742  * always set csa_cachethis to FALSE because the current implementation
6743  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6744  */
6745 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6746 {
6747         unsigned int max_rqst_sz, max_resp_sz;
6748
6749         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6750         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6751
6752         /* Fore channel attributes */
6753         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6754         args->fc_attrs.max_resp_sz = max_resp_sz;
6755         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6756         args->fc_attrs.max_reqs = max_session_slots;
6757
6758         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6759                 "max_ops=%u max_reqs=%u\n",
6760                 __func__,
6761                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6762                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6763
6764         /* Back channel attributes */
6765         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6766         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6767         args->bc_attrs.max_resp_sz_cached = 0;
6768         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6769         args->bc_attrs.max_reqs = 1;
6770
6771         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6772                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6773                 __func__,
6774                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6775                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6776                 args->bc_attrs.max_reqs);
6777 }
6778
6779 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6780 {
6781         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6782         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6783
6784         if (rcvd->max_resp_sz > sent->max_resp_sz)
6785                 return -EINVAL;
6786         /*
6787          * Our requested max_ops is the minimum we need; we're not
6788          * prepared to break up compounds into smaller pieces than that.
6789          * So, no point even trying to continue if the server won't
6790          * cooperate:
6791          */
6792         if (rcvd->max_ops < sent->max_ops)
6793                 return -EINVAL;
6794         if (rcvd->max_reqs == 0)
6795                 return -EINVAL;
6796         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6797                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6798         return 0;
6799 }
6800
6801 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6802 {
6803         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6804         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6805
6806         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6807                 return -EINVAL;
6808         if (rcvd->max_resp_sz < sent->max_resp_sz)
6809                 return -EINVAL;
6810         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6811                 return -EINVAL;
6812         /* These would render the backchannel useless: */
6813         if (rcvd->max_ops != sent->max_ops)
6814                 return -EINVAL;
6815         if (rcvd->max_reqs != sent->max_reqs)
6816                 return -EINVAL;
6817         return 0;
6818 }
6819
6820 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6821                                      struct nfs4_session *session)
6822 {
6823         int ret;
6824
6825         ret = nfs4_verify_fore_channel_attrs(args, session);
6826         if (ret)
6827                 return ret;
6828         return nfs4_verify_back_channel_attrs(args, session);
6829 }
6830
6831 static int _nfs4_proc_create_session(struct nfs_client *clp,
6832                 struct rpc_cred *cred)
6833 {
6834         struct nfs4_session *session = clp->cl_session;
6835         struct nfs41_create_session_args args = {
6836                 .client = clp,
6837                 .cb_program = NFS4_CALLBACK,
6838         };
6839         struct nfs41_create_session_res res = {
6840                 .client = clp,
6841         };
6842         struct rpc_message msg = {
6843                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6844                 .rpc_argp = &args,
6845                 .rpc_resp = &res,
6846                 .rpc_cred = cred,
6847         };
6848         int status;
6849
6850         nfs4_init_channel_attrs(&args);
6851         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6852
6853         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6854         trace_nfs4_create_session(clp, status);
6855
6856         if (!status) {
6857                 /* Verify the session's negotiated channel_attrs values */
6858                 status = nfs4_verify_channel_attrs(&args, session);
6859                 /* Increment the clientid slot sequence id */
6860                 clp->cl_seqid++;
6861         }
6862
6863         return status;
6864 }
6865
6866 /*
6867  * Issues a CREATE_SESSION operation to the server.
6868  * It is the responsibility of the caller to verify the session is
6869  * expired before calling this routine.
6870  */
6871 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6872 {
6873         int status;
6874         unsigned *ptr;
6875         struct nfs4_session *session = clp->cl_session;
6876
6877         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6878
6879         status = _nfs4_proc_create_session(clp, cred);
6880         if (status)
6881                 goto out;
6882
6883         /* Init or reset the session slot tables */
6884         status = nfs4_setup_session_slot_tables(session);
6885         dprintk("slot table setup returned %d\n", status);
6886         if (status)
6887                 goto out;
6888
6889         ptr = (unsigned *)&session->sess_id.data[0];
6890         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6891                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6892 out:
6893         dprintk("<-- %s\n", __func__);
6894         return status;
6895 }
6896
6897 /*
6898  * Issue the over-the-wire RPC DESTROY_SESSION.
6899  * The caller must serialize access to this routine.
6900  */
6901 int nfs4_proc_destroy_session(struct nfs4_session *session,
6902                 struct rpc_cred *cred)
6903 {
6904         struct rpc_message msg = {
6905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6906                 .rpc_argp = session,
6907                 .rpc_cred = cred,
6908         };
6909         int status = 0;
6910
6911         dprintk("--> nfs4_proc_destroy_session\n");
6912
6913         /* session is still being setup */
6914         if (session->clp->cl_cons_state != NFS_CS_READY)
6915                 return status;
6916
6917         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6918         trace_nfs4_destroy_session(session->clp, status);
6919
6920         if (status)
6921                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6922                         "Session has been destroyed regardless...\n", status);
6923
6924         dprintk("<-- nfs4_proc_destroy_session\n");
6925         return status;
6926 }
6927
6928 /*
6929  * Renew the cl_session lease.
6930  */
6931 struct nfs4_sequence_data {
6932         struct nfs_client *clp;
6933         struct nfs4_sequence_args args;
6934         struct nfs4_sequence_res res;
6935 };
6936
6937 static void nfs41_sequence_release(void *data)
6938 {
6939         struct nfs4_sequence_data *calldata = data;
6940         struct nfs_client *clp = calldata->clp;
6941
6942         if (atomic_read(&clp->cl_count) > 1)
6943                 nfs4_schedule_state_renewal(clp);
6944         nfs_put_client(clp);
6945         kfree(calldata);
6946 }
6947
6948 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6949 {
6950         switch(task->tk_status) {
6951         case -NFS4ERR_DELAY:
6952                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6953                 return -EAGAIN;
6954         default:
6955                 nfs4_schedule_lease_recovery(clp);
6956         }
6957         return 0;
6958 }
6959
6960 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6961 {
6962         struct nfs4_sequence_data *calldata = data;
6963         struct nfs_client *clp = calldata->clp;
6964
6965         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6966                 return;
6967
6968         trace_nfs4_sequence(clp, task->tk_status);
6969         if (task->tk_status < 0) {
6970                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6971                 if (atomic_read(&clp->cl_count) == 1)
6972                         goto out;
6973
6974                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6975                         rpc_restart_call_prepare(task);
6976                         return;
6977                 }
6978         }
6979         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6980 out:
6981         dprintk("<-- %s\n", __func__);
6982 }
6983
6984 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6985 {
6986         struct nfs4_sequence_data *calldata = data;
6987         struct nfs_client *clp = calldata->clp;
6988         struct nfs4_sequence_args *args;
6989         struct nfs4_sequence_res *res;
6990
6991         args = task->tk_msg.rpc_argp;
6992         res = task->tk_msg.rpc_resp;
6993
6994         nfs41_setup_sequence(clp->cl_session, args, res, task);
6995 }
6996
6997 static const struct rpc_call_ops nfs41_sequence_ops = {
6998         .rpc_call_done = nfs41_sequence_call_done,
6999         .rpc_call_prepare = nfs41_sequence_prepare,
7000         .rpc_release = nfs41_sequence_release,
7001 };
7002
7003 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7004                 struct rpc_cred *cred,
7005                 bool is_privileged)
7006 {
7007         struct nfs4_sequence_data *calldata;
7008         struct rpc_message msg = {
7009                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7010                 .rpc_cred = cred,
7011         };
7012         struct rpc_task_setup task_setup_data = {
7013                 .rpc_client = clp->cl_rpcclient,
7014                 .rpc_message = &msg,
7015                 .callback_ops = &nfs41_sequence_ops,
7016                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7017         };
7018
7019         if (!atomic_inc_not_zero(&clp->cl_count))
7020                 return ERR_PTR(-EIO);
7021         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7022         if (calldata == NULL) {
7023                 nfs_put_client(clp);
7024                 return ERR_PTR(-ENOMEM);
7025         }
7026         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7027         if (is_privileged)
7028                 nfs4_set_sequence_privileged(&calldata->args);
7029         msg.rpc_argp = &calldata->args;
7030         msg.rpc_resp = &calldata->res;
7031         calldata->clp = clp;
7032         task_setup_data.callback_data = calldata;
7033
7034         return rpc_run_task(&task_setup_data);
7035 }
7036
7037 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7038 {
7039         struct rpc_task *task;
7040         int ret = 0;
7041
7042         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7043                 return 0;
7044         task = _nfs41_proc_sequence(clp, cred, false);
7045         if (IS_ERR(task))
7046                 ret = PTR_ERR(task);
7047         else
7048                 rpc_put_task_async(task);
7049         dprintk("<-- %s status=%d\n", __func__, ret);
7050         return ret;
7051 }
7052
7053 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7054 {
7055         struct rpc_task *task;
7056         int ret;
7057
7058         task = _nfs41_proc_sequence(clp, cred, true);
7059         if (IS_ERR(task)) {
7060                 ret = PTR_ERR(task);
7061                 goto out;
7062         }
7063         ret = rpc_wait_for_completion_task(task);
7064         if (!ret) {
7065                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7066
7067                 if (task->tk_status == 0)
7068                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7069                 ret = task->tk_status;
7070         }
7071         rpc_put_task(task);
7072 out:
7073         dprintk("<-- %s status=%d\n", __func__, ret);
7074         return ret;
7075 }
7076
7077 struct nfs4_reclaim_complete_data {
7078         struct nfs_client *clp;
7079         struct nfs41_reclaim_complete_args arg;
7080         struct nfs41_reclaim_complete_res res;
7081 };
7082
7083 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7084 {
7085         struct nfs4_reclaim_complete_data *calldata = data;
7086
7087         nfs41_setup_sequence(calldata->clp->cl_session,
7088                         &calldata->arg.seq_args,
7089                         &calldata->res.seq_res,
7090                         task);
7091 }
7092
7093 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7094 {
7095         switch(task->tk_status) {
7096         case 0:
7097         case -NFS4ERR_COMPLETE_ALREADY:
7098         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7099                 break;
7100         case -NFS4ERR_DELAY:
7101                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7102                 /* fall through */
7103         case -NFS4ERR_RETRY_UNCACHED_REP:
7104                 return -EAGAIN;
7105         default:
7106                 nfs4_schedule_lease_recovery(clp);
7107         }
7108         return 0;
7109 }
7110
7111 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7112 {
7113         struct nfs4_reclaim_complete_data *calldata = data;
7114         struct nfs_client *clp = calldata->clp;
7115         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7116
7117         dprintk("--> %s\n", __func__);
7118         if (!nfs41_sequence_done(task, res))
7119                 return;
7120
7121         trace_nfs4_reclaim_complete(clp, task->tk_status);
7122         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7123                 rpc_restart_call_prepare(task);
7124                 return;
7125         }
7126         dprintk("<-- %s\n", __func__);
7127 }
7128
7129 static void nfs4_free_reclaim_complete_data(void *data)
7130 {
7131         struct nfs4_reclaim_complete_data *calldata = data;
7132
7133         kfree(calldata);
7134 }
7135
7136 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7137         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7138         .rpc_call_done = nfs4_reclaim_complete_done,
7139         .rpc_release = nfs4_free_reclaim_complete_data,
7140 };
7141
7142 /*
7143  * Issue a global reclaim complete.
7144  */
7145 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7146                 struct rpc_cred *cred)
7147 {
7148         struct nfs4_reclaim_complete_data *calldata;
7149         struct rpc_task *task;
7150         struct rpc_message msg = {
7151                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7152                 .rpc_cred = cred,
7153         };
7154         struct rpc_task_setup task_setup_data = {
7155                 .rpc_client = clp->cl_rpcclient,
7156                 .rpc_message = &msg,
7157                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7158                 .flags = RPC_TASK_ASYNC,
7159         };
7160         int status = -ENOMEM;
7161
7162         dprintk("--> %s\n", __func__);
7163         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7164         if (calldata == NULL)
7165                 goto out;
7166         calldata->clp = clp;
7167         calldata->arg.one_fs = 0;
7168
7169         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7170         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7171         msg.rpc_argp = &calldata->arg;
7172         msg.rpc_resp = &calldata->res;
7173         task_setup_data.callback_data = calldata;
7174         task = rpc_run_task(&task_setup_data);
7175         if (IS_ERR(task)) {
7176                 status = PTR_ERR(task);
7177                 goto out;
7178         }
7179         status = nfs4_wait_for_completion_rpc_task(task);
7180         if (status == 0)
7181                 status = task->tk_status;
7182         rpc_put_task(task);
7183         return 0;
7184 out:
7185         dprintk("<-- %s status=%d\n", __func__, status);
7186         return status;
7187 }
7188
7189 static void
7190 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7191 {
7192         struct nfs4_layoutget *lgp = calldata;
7193         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7194         struct nfs4_session *session = nfs4_get_session(server);
7195
7196         dprintk("--> %s\n", __func__);
7197         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7198          * right now covering the LAYOUTGET we are about to send.
7199          * However, that is not so catastrophic, and there seems
7200          * to be no way to prevent it completely.
7201          */
7202         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7203                                 &lgp->res.seq_res, task))
7204                 return;
7205         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7206                                           NFS_I(lgp->args.inode)->layout,
7207                                           lgp->args.ctx->state)) {
7208                 rpc_exit(task, NFS4_OK);
7209         }
7210 }
7211
7212 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7213 {
7214         struct nfs4_layoutget *lgp = calldata;
7215         struct inode *inode = lgp->args.inode;
7216         struct nfs_server *server = NFS_SERVER(inode);
7217         struct pnfs_layout_hdr *lo;
7218         struct nfs4_state *state = NULL;
7219         unsigned long timeo, giveup;
7220
7221         dprintk("--> %s\n", __func__);
7222
7223         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7224                 goto out;
7225
7226         switch (task->tk_status) {
7227         case 0:
7228                 goto out;
7229         case -NFS4ERR_LAYOUTTRYLATER:
7230         case -NFS4ERR_RECALLCONFLICT:
7231                 timeo = rpc_get_timeout(task->tk_client);
7232                 giveup = lgp->args.timestamp + timeo;
7233                 if (time_after(giveup, jiffies))
7234                         task->tk_status = -NFS4ERR_DELAY;
7235                 break;
7236         case -NFS4ERR_EXPIRED:
7237         case -NFS4ERR_BAD_STATEID:
7238                 spin_lock(&inode->i_lock);
7239                 lo = NFS_I(inode)->layout;
7240                 if (!lo || list_empty(&lo->plh_segs)) {
7241                         spin_unlock(&inode->i_lock);
7242                         /* If the open stateid was bad, then recover it. */
7243                         state = lgp->args.ctx->state;
7244                 } else {
7245                         LIST_HEAD(head);
7246
7247                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7248                         spin_unlock(&inode->i_lock);
7249                         /* Mark the bad layout state as invalid, then
7250                          * retry using the open stateid. */
7251                         pnfs_free_lseg_list(&head);
7252                 }
7253         }
7254         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7255                 rpc_restart_call_prepare(task);
7256 out:
7257         dprintk("<-- %s\n", __func__);
7258 }
7259
7260 static size_t max_response_pages(struct nfs_server *server)
7261 {
7262         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7263         return nfs_page_array_len(0, max_resp_sz);
7264 }
7265
7266 static void nfs4_free_pages(struct page **pages, size_t size)
7267 {
7268         int i;
7269
7270         if (!pages)
7271                 return;
7272
7273         for (i = 0; i < size; i++) {
7274                 if (!pages[i])
7275                         break;
7276                 __free_page(pages[i]);
7277         }
7278         kfree(pages);
7279 }
7280
7281 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7282 {
7283         struct page **pages;
7284         int i;
7285
7286         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7287         if (!pages) {
7288                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7289                 return NULL;
7290         }
7291
7292         for (i = 0; i < size; i++) {
7293                 pages[i] = alloc_page(gfp_flags);
7294                 if (!pages[i]) {
7295                         dprintk("%s: failed to allocate page\n", __func__);
7296                         nfs4_free_pages(pages, size);
7297                         return NULL;
7298                 }
7299         }
7300
7301         return pages;
7302 }
7303
7304 static void nfs4_layoutget_release(void *calldata)
7305 {
7306         struct nfs4_layoutget *lgp = calldata;
7307         struct inode *inode = lgp->args.inode;
7308         struct nfs_server *server = NFS_SERVER(inode);
7309         size_t max_pages = max_response_pages(server);
7310
7311         dprintk("--> %s\n", __func__);
7312         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7313         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7314         put_nfs_open_context(lgp->args.ctx);
7315         kfree(calldata);
7316         dprintk("<-- %s\n", __func__);
7317 }
7318
7319 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7320         .rpc_call_prepare = nfs4_layoutget_prepare,
7321         .rpc_call_done = nfs4_layoutget_done,
7322         .rpc_release = nfs4_layoutget_release,
7323 };
7324
7325 struct pnfs_layout_segment *
7326 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7327 {
7328         struct inode *inode = lgp->args.inode;
7329         struct nfs_server *server = NFS_SERVER(inode);
7330         size_t max_pages = max_response_pages(server);
7331         struct rpc_task *task;
7332         struct rpc_message msg = {
7333                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7334                 .rpc_argp = &lgp->args,
7335                 .rpc_resp = &lgp->res,
7336                 .rpc_cred = lgp->cred,
7337         };
7338         struct rpc_task_setup task_setup_data = {
7339                 .rpc_client = server->client,
7340                 .rpc_message = &msg,
7341                 .callback_ops = &nfs4_layoutget_call_ops,
7342                 .callback_data = lgp,
7343                 .flags = RPC_TASK_ASYNC,
7344         };
7345         struct pnfs_layout_segment *lseg = NULL;
7346         int status = 0;
7347
7348         dprintk("--> %s\n", __func__);
7349
7350         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7351         if (!lgp->args.layout.pages) {
7352                 nfs4_layoutget_release(lgp);
7353                 return ERR_PTR(-ENOMEM);
7354         }
7355         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7356         lgp->args.timestamp = jiffies;
7357
7358         lgp->res.layoutp = &lgp->args.layout;
7359         lgp->res.seq_res.sr_slot = NULL;
7360         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7361
7362         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7363         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7364
7365         task = rpc_run_task(&task_setup_data);
7366         if (IS_ERR(task))
7367                 return ERR_CAST(task);
7368         status = nfs4_wait_for_completion_rpc_task(task);
7369         if (status == 0)
7370                 status = task->tk_status;
7371         trace_nfs4_layoutget(lgp->args.ctx,
7372                         &lgp->args.range,
7373                         &lgp->res.range,
7374                         status);
7375         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7376         if (status == 0 && lgp->res.layoutp->len)
7377                 lseg = pnfs_layout_process(lgp);
7378         rpc_put_task(task);
7379         dprintk("<-- %s status=%d\n", __func__, status);
7380         if (status)
7381                 return ERR_PTR(status);
7382         return lseg;
7383 }
7384
7385 static void
7386 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7387 {
7388         struct nfs4_layoutreturn *lrp = calldata;
7389
7390         dprintk("--> %s\n", __func__);
7391         nfs41_setup_sequence(lrp->clp->cl_session,
7392                         &lrp->args.seq_args,
7393                         &lrp->res.seq_res,
7394                         task);
7395 }
7396
7397 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7398 {
7399         struct nfs4_layoutreturn *lrp = calldata;
7400         struct nfs_server *server;
7401
7402         dprintk("--> %s\n", __func__);
7403
7404         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7405                 return;
7406
7407         server = NFS_SERVER(lrp->args.inode);
7408         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7409                 rpc_restart_call_prepare(task);
7410                 return;
7411         }
7412         dprintk("<-- %s\n", __func__);
7413 }
7414
7415 static void nfs4_layoutreturn_release(void *calldata)
7416 {
7417         struct nfs4_layoutreturn *lrp = calldata;
7418         struct pnfs_layout_hdr *lo = lrp->args.layout;
7419
7420         dprintk("--> %s\n", __func__);
7421         spin_lock(&lo->plh_inode->i_lock);
7422         if (lrp->res.lrs_present)
7423                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7424         lo->plh_block_lgets--;
7425         spin_unlock(&lo->plh_inode->i_lock);
7426         pnfs_put_layout_hdr(lrp->args.layout);
7427         kfree(calldata);
7428         dprintk("<-- %s\n", __func__);
7429 }
7430
7431 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7432         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7433         .rpc_call_done = nfs4_layoutreturn_done,
7434         .rpc_release = nfs4_layoutreturn_release,
7435 };
7436
7437 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7438 {
7439         struct rpc_task *task;
7440         struct rpc_message msg = {
7441                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7442                 .rpc_argp = &lrp->args,
7443                 .rpc_resp = &lrp->res,
7444                 .rpc_cred = lrp->cred,
7445         };
7446         struct rpc_task_setup task_setup_data = {
7447                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7448                 .rpc_message = &msg,
7449                 .callback_ops = &nfs4_layoutreturn_call_ops,
7450                 .callback_data = lrp,
7451         };
7452         int status;
7453
7454         dprintk("--> %s\n", __func__);
7455         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7456         task = rpc_run_task(&task_setup_data);
7457         if (IS_ERR(task))
7458                 return PTR_ERR(task);
7459         status = task->tk_status;
7460         trace_nfs4_layoutreturn(lrp->args.inode, status);
7461         dprintk("<-- %s status=%d\n", __func__, status);
7462         rpc_put_task(task);
7463         return status;
7464 }
7465
7466 /*
7467  * Retrieve the list of Data Server devices from the MDS.
7468  */
7469 static int _nfs4_getdevicelist(struct nfs_server *server,
7470                                     const struct nfs_fh *fh,
7471                                     struct pnfs_devicelist *devlist)
7472 {
7473         struct nfs4_getdevicelist_args args = {
7474                 .fh = fh,
7475                 .layoutclass = server->pnfs_curr_ld->id,
7476         };
7477         struct nfs4_getdevicelist_res res = {
7478                 .devlist = devlist,
7479         };
7480         struct rpc_message msg = {
7481                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7482                 .rpc_argp = &args,
7483                 .rpc_resp = &res,
7484         };
7485         int status;
7486
7487         dprintk("--> %s\n", __func__);
7488         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7489                                 &res.seq_res, 0);
7490         dprintk("<-- %s status=%d\n", __func__, status);
7491         return status;
7492 }
7493
7494 int nfs4_proc_getdevicelist(struct nfs_server *server,
7495                             const struct nfs_fh *fh,
7496                             struct pnfs_devicelist *devlist)
7497 {
7498         struct nfs4_exception exception = { };
7499         int err;
7500
7501         do {
7502                 err = nfs4_handle_exception(server,
7503                                 _nfs4_getdevicelist(server, fh, devlist),
7504                                 &exception);
7505         } while (exception.retry);
7506
7507         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7508                 err, devlist->num_devs);
7509
7510         return err;
7511 }
7512 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7513
7514 static int
7515 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7516                 struct pnfs_device *pdev,
7517                 struct rpc_cred *cred)
7518 {
7519         struct nfs4_getdeviceinfo_args args = {
7520                 .pdev = pdev,
7521         };
7522         struct nfs4_getdeviceinfo_res res = {
7523                 .pdev = pdev,
7524         };
7525         struct rpc_message msg = {
7526                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7527                 .rpc_argp = &args,
7528                 .rpc_resp = &res,
7529                 .rpc_cred = cred,
7530         };
7531         int status;
7532
7533         dprintk("--> %s\n", __func__);
7534         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7535         dprintk("<-- %s status=%d\n", __func__, status);
7536
7537         return status;
7538 }
7539
7540 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7541                 struct pnfs_device *pdev,
7542                 struct rpc_cred *cred)
7543 {
7544         struct nfs4_exception exception = { };
7545         int err;
7546
7547         do {
7548                 err = nfs4_handle_exception(server,
7549                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7550                                         &exception);
7551         } while (exception.retry);
7552         return err;
7553 }
7554 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7555
7556 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7557 {
7558         struct nfs4_layoutcommit_data *data = calldata;
7559         struct nfs_server *server = NFS_SERVER(data->args.inode);
7560         struct nfs4_session *session = nfs4_get_session(server);
7561
7562         nfs41_setup_sequence(session,
7563                         &data->args.seq_args,
7564                         &data->res.seq_res,
7565                         task);
7566 }
7567
7568 static void
7569 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7570 {
7571         struct nfs4_layoutcommit_data *data = calldata;
7572         struct nfs_server *server = NFS_SERVER(data->args.inode);
7573
7574         if (!nfs41_sequence_done(task, &data->res.seq_res))
7575                 return;
7576
7577         switch (task->tk_status) { /* Just ignore these failures */
7578         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7579         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7580         case -NFS4ERR_BADLAYOUT:     /* no layout */
7581         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7582                 task->tk_status = 0;
7583                 break;
7584         case 0:
7585                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7586                                                    data->res.fattr);
7587                 break;
7588         default:
7589                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7590                         rpc_restart_call_prepare(task);
7591                         return;
7592                 }
7593         }
7594 }
7595
7596 static void nfs4_layoutcommit_release(void *calldata)
7597 {
7598         struct nfs4_layoutcommit_data *data = calldata;
7599
7600         pnfs_cleanup_layoutcommit(data);
7601         put_rpccred(data->cred);
7602         kfree(data);
7603 }
7604
7605 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7606         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7607         .rpc_call_done = nfs4_layoutcommit_done,
7608         .rpc_release = nfs4_layoutcommit_release,
7609 };
7610
7611 int
7612 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7613 {
7614         struct rpc_message msg = {
7615                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7616                 .rpc_argp = &data->args,
7617                 .rpc_resp = &data->res,
7618                 .rpc_cred = data->cred,
7619         };
7620         struct rpc_task_setup task_setup_data = {
7621                 .task = &data->task,
7622                 .rpc_client = NFS_CLIENT(data->args.inode),
7623                 .rpc_message = &msg,
7624                 .callback_ops = &nfs4_layoutcommit_ops,
7625                 .callback_data = data,
7626                 .flags = RPC_TASK_ASYNC,
7627         };
7628         struct rpc_task *task;
7629         int status = 0;
7630
7631         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7632                 "lbw: %llu inode %lu\n",
7633                 data->task.tk_pid, sync,
7634                 data->args.lastbytewritten,
7635                 data->args.inode->i_ino);
7636
7637         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7638         task = rpc_run_task(&task_setup_data);
7639         if (IS_ERR(task))
7640                 return PTR_ERR(task);
7641         if (sync == false)
7642                 goto out;
7643         status = nfs4_wait_for_completion_rpc_task(task);
7644         if (status != 0)
7645                 goto out;
7646         status = task->tk_status;
7647         trace_nfs4_layoutcommit(data->args.inode, status);
7648 out:
7649         dprintk("%s: status %d\n", __func__, status);
7650         rpc_put_task(task);
7651         return status;
7652 }
7653
7654 /**
7655  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7656  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7657  */
7658 static int
7659 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7660                     struct nfs_fsinfo *info,
7661                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7662 {
7663         struct nfs41_secinfo_no_name_args args = {
7664                 .style = SECINFO_STYLE_CURRENT_FH,
7665         };
7666         struct nfs4_secinfo_res res = {
7667                 .flavors = flavors,
7668         };
7669         struct rpc_message msg = {
7670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7671                 .rpc_argp = &args,
7672                 .rpc_resp = &res,
7673         };
7674         struct rpc_clnt *clnt = server->client;
7675         struct rpc_cred *cred = NULL;
7676         int status;
7677
7678         if (use_integrity) {
7679                 clnt = server->nfs_client->cl_rpcclient;
7680                 cred = nfs4_get_clid_cred(server->nfs_client);
7681                 msg.rpc_cred = cred;
7682         }
7683
7684         dprintk("--> %s\n", __func__);
7685         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7686                                 &res.seq_res, 0);
7687         dprintk("<-- %s status=%d\n", __func__, status);
7688
7689         if (cred)
7690                 put_rpccred(cred);
7691
7692         return status;
7693 }
7694
7695 static int
7696 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7697                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7698 {
7699         struct nfs4_exception exception = { };
7700         int err;
7701         do {
7702                 /* first try using integrity protection */
7703                 err = -NFS4ERR_WRONGSEC;
7704
7705                 /* try to use integrity protection with machine cred */
7706                 if (_nfs4_is_integrity_protected(server->nfs_client))
7707                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7708                                                           flavors, true);
7709
7710                 /*
7711                  * if unable to use integrity protection, or SECINFO with
7712                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7713                  * disallowed by spec, but exists in deployed servers) use
7714                  * the current filesystem's rpc_client and the user cred.
7715                  */
7716                 if (err == -NFS4ERR_WRONGSEC)
7717                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7718                                                           flavors, false);
7719
7720                 switch (err) {
7721                 case 0:
7722                 case -NFS4ERR_WRONGSEC:
7723                 case -NFS4ERR_NOTSUPP:
7724                         goto out;
7725                 default:
7726                         err = nfs4_handle_exception(server, err, &exception);
7727                 }
7728         } while (exception.retry);
7729 out:
7730         return err;
7731 }
7732
7733 static int
7734 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7735                     struct nfs_fsinfo *info)
7736 {
7737         int err;
7738         struct page *page;
7739         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
7740         struct nfs4_secinfo_flavors *flavors;
7741         struct nfs4_secinfo4 *secinfo;
7742         int i;
7743
7744         page = alloc_page(GFP_KERNEL);
7745         if (!page) {
7746                 err = -ENOMEM;
7747                 goto out;
7748         }
7749
7750         flavors = page_address(page);
7751         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7752
7753         /*
7754          * Fall back on "guess and check" method if
7755          * the server doesn't support SECINFO_NO_NAME
7756          */
7757         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7758                 err = nfs4_find_root_sec(server, fhandle, info);
7759                 goto out_freepage;
7760         }
7761         if (err)
7762                 goto out_freepage;
7763
7764         for (i = 0; i < flavors->num_flavors; i++) {
7765                 secinfo = &flavors->flavors[i];
7766
7767                 switch (secinfo->flavor) {
7768                 case RPC_AUTH_NULL:
7769                 case RPC_AUTH_UNIX:
7770                 case RPC_AUTH_GSS:
7771                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
7772                                         &secinfo->flavor_info);
7773                         break;
7774                 default:
7775                         flavor = RPC_AUTH_MAXFLAVOR;
7776                         break;
7777                 }
7778
7779                 if (flavor != RPC_AUTH_MAXFLAVOR) {
7780                         err = nfs4_lookup_root_sec(server, fhandle,
7781                                                    info, flavor);
7782                         if (!err)
7783                                 break;
7784                 }
7785         }
7786
7787         if (flavor == RPC_AUTH_MAXFLAVOR)
7788                 err = -EPERM;
7789
7790 out_freepage:
7791         put_page(page);
7792         if (err == -EACCES)
7793                 return -EPERM;
7794 out:
7795         return err;
7796 }
7797
7798 static int _nfs41_test_stateid(struct nfs_server *server,
7799                 nfs4_stateid *stateid,
7800                 struct rpc_cred *cred)
7801 {
7802         int status;
7803         struct nfs41_test_stateid_args args = {
7804                 .stateid = stateid,
7805         };
7806         struct nfs41_test_stateid_res res;
7807         struct rpc_message msg = {
7808                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7809                 .rpc_argp = &args,
7810                 .rpc_resp = &res,
7811                 .rpc_cred = cred,
7812         };
7813         struct rpc_clnt *rpc_client = server->client;
7814
7815         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
7816                 &rpc_client, &msg);
7817
7818         dprintk("NFS call  test_stateid %p\n", stateid);
7819         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
7820         nfs4_set_sequence_privileged(&args.seq_args);
7821         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
7822                         &args.seq_args, &res.seq_res);
7823         if (status != NFS_OK) {
7824                 dprintk("NFS reply test_stateid: failed, %d\n", status);
7825                 return status;
7826         }
7827         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7828         return -res.status;
7829 }
7830
7831 /**
7832  * nfs41_test_stateid - perform a TEST_STATEID operation
7833  *
7834  * @server: server / transport on which to perform the operation
7835  * @stateid: state ID to test
7836  * @cred: credential
7837  *
7838  * Returns NFS_OK if the server recognizes that "stateid" is valid.
7839  * Otherwise a negative NFS4ERR value is returned if the operation
7840  * failed or the state ID is not currently valid.
7841  */
7842 static int nfs41_test_stateid(struct nfs_server *server,
7843                 nfs4_stateid *stateid,
7844                 struct rpc_cred *cred)
7845 {
7846         struct nfs4_exception exception = { };
7847         int err;
7848         do {
7849                 err = _nfs41_test_stateid(server, stateid, cred);
7850                 if (err != -NFS4ERR_DELAY)
7851                         break;
7852                 nfs4_handle_exception(server, err, &exception);
7853         } while (exception.retry);
7854         return err;
7855 }
7856
7857 struct nfs_free_stateid_data {
7858         struct nfs_server *server;
7859         struct nfs41_free_stateid_args args;
7860         struct nfs41_free_stateid_res res;
7861 };
7862
7863 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
7864 {
7865         struct nfs_free_stateid_data *data = calldata;
7866         nfs41_setup_sequence(nfs4_get_session(data->server),
7867                         &data->args.seq_args,
7868                         &data->res.seq_res,
7869                         task);
7870 }
7871
7872 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
7873 {
7874         struct nfs_free_stateid_data *data = calldata;
7875
7876         nfs41_sequence_done(task, &data->res.seq_res);
7877
7878         switch (task->tk_status) {
7879         case -NFS4ERR_DELAY:
7880                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
7881                         rpc_restart_call_prepare(task);
7882         }
7883 }
7884
7885 static void nfs41_free_stateid_release(void *calldata)
7886 {
7887         kfree(calldata);
7888 }
7889
7890 static const struct rpc_call_ops nfs41_free_stateid_ops = {
7891         .rpc_call_prepare = nfs41_free_stateid_prepare,
7892         .rpc_call_done = nfs41_free_stateid_done,
7893         .rpc_release = nfs41_free_stateid_release,
7894 };
7895
7896 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
7897                 nfs4_stateid *stateid,
7898                 struct rpc_cred *cred,
7899                 bool privileged)
7900 {
7901         struct rpc_message msg = {
7902                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7903                 .rpc_cred = cred,
7904         };
7905         struct rpc_task_setup task_setup = {
7906                 .rpc_client = server->client,
7907                 .rpc_message = &msg,
7908                 .callback_ops = &nfs41_free_stateid_ops,
7909                 .flags = RPC_TASK_ASYNC,
7910         };
7911         struct nfs_free_stateid_data *data;
7912
7913         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
7914                 &task_setup.rpc_client, &msg);
7915
7916         dprintk("NFS call  free_stateid %p\n", stateid);
7917         data = kmalloc(sizeof(*data), GFP_NOFS);
7918         if (!data)
7919                 return ERR_PTR(-ENOMEM);
7920         data->server = server;
7921         nfs4_stateid_copy(&data->args.stateid, stateid);
7922
7923         task_setup.callback_data = data;
7924
7925         msg.rpc_argp = &data->args;
7926         msg.rpc_resp = &data->res;
7927         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
7928         if (privileged)
7929                 nfs4_set_sequence_privileged(&data->args.seq_args);
7930
7931         return rpc_run_task(&task_setup);
7932 }
7933
7934 /**
7935  * nfs41_free_stateid - perform a FREE_STATEID operation
7936  *
7937  * @server: server / transport on which to perform the operation
7938  * @stateid: state ID to release
7939  * @cred: credential
7940  *
7941  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7942  * negative NFS4ERR value is returned.
7943  */
7944 static int nfs41_free_stateid(struct nfs_server *server,
7945                 nfs4_stateid *stateid,
7946                 struct rpc_cred *cred)
7947 {
7948         struct rpc_task *task;
7949         int ret;
7950
7951         task = _nfs41_free_stateid(server, stateid, cred, true);
7952         if (IS_ERR(task))
7953                 return PTR_ERR(task);
7954         ret = rpc_wait_for_completion_task(task);
7955         if (!ret)
7956                 ret = task->tk_status;
7957         rpc_put_task(task);
7958         return ret;
7959 }
7960
7961 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
7962 {
7963         struct rpc_task *task;
7964         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
7965
7966         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
7967         nfs4_free_lock_state(server, lsp);
7968         if (IS_ERR(task))
7969                 return PTR_ERR(task);
7970         rpc_put_task(task);
7971         return 0;
7972 }
7973
7974 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7975                 const nfs4_stateid *s2)
7976 {
7977         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7978                 return false;
7979
7980         if (s1->seqid == s2->seqid)
7981                 return true;
7982         if (s1->seqid == 0 || s2->seqid == 0)
7983                 return true;
7984
7985         return false;
7986 }
7987
7988 #endif /* CONFIG_NFS_V4_1 */
7989
7990 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7991                 const nfs4_stateid *s2)
7992 {
7993         return nfs4_stateid_match(s1, s2);
7994 }
7995
7996
7997 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7998         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7999         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8000         .recover_open   = nfs4_open_reclaim,
8001         .recover_lock   = nfs4_lock_reclaim,
8002         .establish_clid = nfs4_init_clientid,
8003         .detect_trunking = nfs40_discover_server_trunking,
8004 };
8005
8006 #if defined(CONFIG_NFS_V4_1)
8007 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8008         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8009         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8010         .recover_open   = nfs4_open_reclaim,
8011         .recover_lock   = nfs4_lock_reclaim,
8012         .establish_clid = nfs41_init_clientid,
8013         .reclaim_complete = nfs41_proc_reclaim_complete,
8014         .detect_trunking = nfs41_discover_server_trunking,
8015 };
8016 #endif /* CONFIG_NFS_V4_1 */
8017
8018 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8019         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8020         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8021         .recover_open   = nfs4_open_expired,
8022         .recover_lock   = nfs4_lock_expired,
8023         .establish_clid = nfs4_init_clientid,
8024 };
8025
8026 #if defined(CONFIG_NFS_V4_1)
8027 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8028         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8029         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8030         .recover_open   = nfs41_open_expired,
8031         .recover_lock   = nfs41_lock_expired,
8032         .establish_clid = nfs41_init_clientid,
8033 };
8034 #endif /* CONFIG_NFS_V4_1 */
8035
8036 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8037         .sched_state_renewal = nfs4_proc_async_renew,
8038         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8039         .renew_lease = nfs4_proc_renew,
8040 };
8041
8042 #if defined(CONFIG_NFS_V4_1)
8043 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8044         .sched_state_renewal = nfs41_proc_async_sequence,
8045         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8046         .renew_lease = nfs4_proc_sequence,
8047 };
8048 #endif
8049
8050 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8051         .get_locations = _nfs40_proc_get_locations,
8052 };
8053
8054 #if defined(CONFIG_NFS_V4_1)
8055 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8056         .get_locations = _nfs41_proc_get_locations,
8057 };
8058 #endif  /* CONFIG_NFS_V4_1 */
8059
8060 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8061         .minor_version = 0,
8062         .init_caps = NFS_CAP_READDIRPLUS
8063                 | NFS_CAP_ATOMIC_OPEN
8064                 | NFS_CAP_CHANGE_ATTR
8065                 | NFS_CAP_POSIX_LOCK,
8066         .init_client = nfs40_init_client,
8067         .shutdown_client = nfs40_shutdown_client,
8068         .match_stateid = nfs4_match_stateid,
8069         .find_root_sec = nfs4_find_root_sec,
8070         .free_lock_state = nfs4_release_lockowner,
8071         .call_sync_ops = &nfs40_call_sync_ops,
8072         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8073         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8074         .state_renewal_ops = &nfs40_state_renewal_ops,
8075         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8076 };
8077
8078 #if defined(CONFIG_NFS_V4_1)
8079 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8080         .minor_version = 1,
8081         .init_caps = NFS_CAP_READDIRPLUS
8082                 | NFS_CAP_ATOMIC_OPEN
8083                 | NFS_CAP_CHANGE_ATTR
8084                 | NFS_CAP_POSIX_LOCK
8085                 | NFS_CAP_STATEID_NFSV41
8086                 | NFS_CAP_ATOMIC_OPEN_V1,
8087         .init_client = nfs41_init_client,
8088         .shutdown_client = nfs41_shutdown_client,
8089         .match_stateid = nfs41_match_stateid,
8090         .find_root_sec = nfs41_find_root_sec,
8091         .free_lock_state = nfs41_free_lock_state,
8092         .call_sync_ops = &nfs41_call_sync_ops,
8093         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8094         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8095         .state_renewal_ops = &nfs41_state_renewal_ops,
8096         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8097 };
8098 #endif
8099
8100 #if defined(CONFIG_NFS_V4_2)
8101 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8102         .minor_version = 2,
8103         .init_caps = NFS_CAP_READDIRPLUS
8104                 | NFS_CAP_ATOMIC_OPEN
8105                 | NFS_CAP_CHANGE_ATTR
8106                 | NFS_CAP_POSIX_LOCK
8107                 | NFS_CAP_STATEID_NFSV41
8108                 | NFS_CAP_ATOMIC_OPEN_V1,
8109         .init_client = nfs41_init_client,
8110         .shutdown_client = nfs41_shutdown_client,
8111         .match_stateid = nfs41_match_stateid,
8112         .find_root_sec = nfs41_find_root_sec,
8113         .free_lock_state = nfs41_free_lock_state,
8114         .call_sync_ops = &nfs41_call_sync_ops,
8115         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8116         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8117         .state_renewal_ops = &nfs41_state_renewal_ops,
8118 };
8119 #endif
8120
8121 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8122         [0] = &nfs_v4_0_minor_ops,
8123 #if defined(CONFIG_NFS_V4_1)
8124         [1] = &nfs_v4_1_minor_ops,
8125 #endif
8126 #if defined(CONFIG_NFS_V4_2)
8127         [2] = &nfs_v4_2_minor_ops,
8128 #endif
8129 };
8130
8131 static const struct inode_operations nfs4_dir_inode_operations = {
8132         .create         = nfs_create,
8133         .lookup         = nfs_lookup,
8134         .atomic_open    = nfs_atomic_open,
8135         .link           = nfs_link,
8136         .unlink         = nfs_unlink,
8137         .symlink        = nfs_symlink,
8138         .mkdir          = nfs_mkdir,
8139         .rmdir          = nfs_rmdir,
8140         .mknod          = nfs_mknod,
8141         .rename         = nfs_rename,
8142         .permission     = nfs_permission,
8143         .getattr        = nfs_getattr,
8144         .setattr        = nfs_setattr,
8145         .getxattr       = generic_getxattr,
8146         .setxattr       = generic_setxattr,
8147         .listxattr      = generic_listxattr,
8148         .removexattr    = generic_removexattr,
8149 };
8150
8151 static const struct inode_operations nfs4_file_inode_operations = {
8152         .permission     = nfs_permission,
8153         .getattr        = nfs_getattr,
8154         .setattr        = nfs_setattr,
8155         .getxattr       = generic_getxattr,
8156         .setxattr       = generic_setxattr,
8157         .listxattr      = generic_listxattr,
8158         .removexattr    = generic_removexattr,
8159 };
8160
8161 const struct nfs_rpc_ops nfs_v4_clientops = {
8162         .version        = 4,                    /* protocol version */
8163         .dentry_ops     = &nfs4_dentry_operations,
8164         .dir_inode_ops  = &nfs4_dir_inode_operations,
8165         .file_inode_ops = &nfs4_file_inode_operations,
8166         .file_ops       = &nfs4_file_operations,
8167         .getroot        = nfs4_proc_get_root,
8168         .submount       = nfs4_submount,
8169         .try_mount      = nfs4_try_mount,
8170         .getattr        = nfs4_proc_getattr,
8171         .setattr        = nfs4_proc_setattr,
8172         .lookup         = nfs4_proc_lookup,
8173         .access         = nfs4_proc_access,
8174         .readlink       = nfs4_proc_readlink,
8175         .create         = nfs4_proc_create,
8176         .remove         = nfs4_proc_remove,
8177         .unlink_setup   = nfs4_proc_unlink_setup,
8178         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8179         .unlink_done    = nfs4_proc_unlink_done,
8180         .rename         = nfs4_proc_rename,
8181         .rename_setup   = nfs4_proc_rename_setup,
8182         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8183         .rename_done    = nfs4_proc_rename_done,
8184         .link           = nfs4_proc_link,
8185         .symlink        = nfs4_proc_symlink,
8186         .mkdir          = nfs4_proc_mkdir,
8187         .rmdir          = nfs4_proc_remove,
8188         .readdir        = nfs4_proc_readdir,
8189         .mknod          = nfs4_proc_mknod,
8190         .statfs         = nfs4_proc_statfs,
8191         .fsinfo         = nfs4_proc_fsinfo,
8192         .pathconf       = nfs4_proc_pathconf,
8193         .set_capabilities = nfs4_server_capabilities,
8194         .decode_dirent  = nfs4_decode_dirent,
8195         .read_setup     = nfs4_proc_read_setup,
8196         .read_pageio_init = pnfs_pageio_init_read,
8197         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
8198         .read_done      = nfs4_read_done,
8199         .write_setup    = nfs4_proc_write_setup,
8200         .write_pageio_init = pnfs_pageio_init_write,
8201         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
8202         .write_done     = nfs4_write_done,
8203         .commit_setup   = nfs4_proc_commit_setup,
8204         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8205         .commit_done    = nfs4_commit_done,
8206         .lock           = nfs4_proc_lock,
8207         .clear_acl_cache = nfs4_zap_acl_attr,
8208         .close_context  = nfs4_close_context,
8209         .open_context   = nfs4_atomic_open,
8210         .have_delegation = nfs4_have_delegation,
8211         .return_delegation = nfs4_inode_return_delegation,
8212         .alloc_client   = nfs4_alloc_client,
8213         .init_client    = nfs4_init_client,
8214         .free_client    = nfs4_free_client,
8215         .create_server  = nfs4_create_server,
8216         .clone_server   = nfs_clone_server,
8217 };
8218
8219 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8220         .prefix = XATTR_NAME_NFSV4_ACL,
8221         .list   = nfs4_xattr_list_nfs4_acl,
8222         .get    = nfs4_xattr_get_nfs4_acl,
8223         .set    = nfs4_xattr_set_nfs4_acl,
8224 };
8225
8226 const struct xattr_handler *nfs4_xattr_handlers[] = {
8227         &nfs4_xattr_nfs4_acl_handler,
8228 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8229         &nfs4_xattr_nfs4_label_handler,
8230 #endif
8231         NULL
8232 };
8233
8234 /*
8235  * Local variables:
8236  *  c-basic-offset: 8
8237  * End:
8238  */