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/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "internal.h"
  55 #include "iostat.h"
  56
  57 #define NFSDBG_FACILITY         NFSDBG_PROC
  58
  59 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  60 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  61
  62 struct nfs4_opendata;
  63 static int _nfs4_proc_open(struct nfs4_opendata *data);
  64 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  65 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  66 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  67 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 static int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __func__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         __be32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 197 {
 198         int res;
 199
 200         might_sleep();
 201
 202         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 203                         nfs_wait_bit_killable, TASK_KILLABLE);
 204         return res;
 205 }
 206
 207 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 208 {
 209         int res = 0;
 210
 211         might_sleep();
 212
 213         if (*timeout <= 0)
 214                 *timeout = NFS4_POLL_RETRY_MIN;
 215         if (*timeout > NFS4_POLL_RETRY_MAX)
 216                 *timeout = NFS4_POLL_RETRY_MAX;
 217         schedule_timeout_killable(*timeout);
 218         if (fatal_signal_pending(current))
 219                 res = -ERESTARTSYS;
 220         *timeout <<= 1;
 221         return res;
 222 }
 223
 224 /* This is the error handling routine for processes that are allowed
 225  * to sleep.
 226  */
 227 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 228 {
 229         struct nfs_client *clp = server->nfs_client;
 230         struct nfs4_state *state = exception->state;
 231         int ret = errorcode;
 232
 233         exception->retry = 0;
 234         switch(errorcode) {
 235                 case 0:
 236                         return 0;
 237                 case -NFS4ERR_ADMIN_REVOKED:
 238                 case -NFS4ERR_BAD_STATEID:
 239                 case -NFS4ERR_OPENMODE:
 240                         if (state == NULL)
 241                                 break;
 242                         nfs4_state_mark_reclaim_nograce(clp, state);
 243                 case -NFS4ERR_STALE_CLIENTID:
 244                 case -NFS4ERR_STALE_STATEID:
 245                 case -NFS4ERR_EXPIRED:
 246                         nfs4_schedule_state_recovery(clp);
 247                         ret = nfs4_wait_clnt_recover(clp);
 248                         if (ret == 0)
 249                                 exception->retry = 1;
 250                         break;
 251                 case -NFS4ERR_FILE_OPEN:
 252                 case -NFS4ERR_GRACE:
 253                 case -NFS4ERR_DELAY:
 254                         ret = nfs4_delay(server->client, &exception->timeout);
 255                         if (ret != 0)
 256                                 break;
 257                 case -NFS4ERR_OLD_STATEID:
 258                         exception->retry = 1;
 259         }
 260         /* We failed to handle the error */
 261         return nfs4_map_errors(ret);
 262 }
 263
 264
 265 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 266 {
 267         struct nfs_client *clp = server->nfs_client;
 268         spin_lock(&clp->cl_lock);
 269         if (time_before(clp->cl_last_renewal,timestamp))
 270                 clp->cl_last_renewal = timestamp;
 271         spin_unlock(&clp->cl_lock);
 272 }
 273
 274 #if defined(CONFIG_NFS_V4_1)
 275
 276 int _nfs4_call_sync_session(struct nfs_server *server,
 277                             struct rpc_message *msg,
 278                             struct nfs4_sequence_args *args,
 279                             struct nfs4_sequence_res *res,
 280                             int cache_reply)
 281 {
 282         /* in preparation for setting up the sequence op */
 283         return rpc_call_sync(server->client, msg, 0);
 284 }
 285
 286 #endif /* CONFIG_NFS_V4_1 */
 287
 288 int _nfs4_call_sync(struct nfs_server *server,
 289                     struct rpc_message *msg,
 290                     struct nfs4_sequence_args *args,
 291                     struct nfs4_sequence_res *res,
 292                     int cache_reply)
 293 {
 294         args->sa_session = res->sr_session = NULL;
 295         return rpc_call_sync(server->client, msg, 0);
 296 }
 297
 298 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 299         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
 300                         &(res)->seq_res, (cache_reply))
 301
 302 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 303 {
 304         struct nfs_inode *nfsi = NFS_I(dir);
 305
 306         spin_lock(&dir->i_lock);
 307         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 308         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 309                 nfs_force_lookup_revalidate(dir);
 310         nfsi->change_attr = cinfo->after;
 311         spin_unlock(&dir->i_lock);
 312 }
 313
 314 struct nfs4_opendata {
 315         struct kref kref;
 316         struct nfs_openargs o_arg;
 317         struct nfs_openres o_res;
 318         struct nfs_open_confirmargs c_arg;
 319         struct nfs_open_confirmres c_res;
 320         struct nfs_fattr f_attr;
 321         struct nfs_fattr dir_attr;
 322         struct path path;
 323         struct dentry *dir;
 324         struct nfs4_state_owner *owner;
 325         struct nfs4_state *state;
 326         struct iattr attrs;
 327         unsigned long timestamp;
 328         unsigned int rpc_done : 1;
 329         int rpc_status;
 330         int cancelled;
 331 };
 332
 333
 334 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 335 {
 336         p->o_res.f_attr = &p->f_attr;
 337         p->o_res.dir_attr = &p->dir_attr;
 338         p->o_res.seqid = p->o_arg.seqid;
 339         p->c_res.seqid = p->c_arg.seqid;
 340         p->o_res.server = p->o_arg.server;
 341         nfs_fattr_init(&p->f_attr);
 342         nfs_fattr_init(&p->dir_attr);
 343 }
 344
 345 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 346                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 347                 const struct iattr *attrs)
 348 {
 349         struct dentry *parent = dget_parent(path->dentry);
 350         struct inode *dir = parent->d_inode;
 351         struct nfs_server *server = NFS_SERVER(dir);
 352         struct nfs4_opendata *p;
 353
 354         p = kzalloc(sizeof(*p), GFP_KERNEL);
 355         if (p == NULL)
 356                 goto err;
 357         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 358         if (p->o_arg.seqid == NULL)
 359                 goto err_free;
 360         p->path.mnt = mntget(path->mnt);
 361         p->path.dentry = dget(path->dentry);
 362         p->dir = parent;
 363         p->owner = sp;
 364         atomic_inc(&sp->so_count);
 365         p->o_arg.fh = NFS_FH(dir);
 366         p->o_arg.open_flags = flags;
 367         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 368         p->o_arg.clientid = server->nfs_client->cl_clientid;
 369         p->o_arg.id = sp->so_owner_id.id;
 370         p->o_arg.name = &p->path.dentry->d_name;
 371         p->o_arg.server = server;
 372         p->o_arg.bitmask = server->attr_bitmask;
 373         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 374         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 375         if (flags & O_EXCL) {
 376                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 377                 s[0] = jiffies;
 378                 s[1] = current->pid;
 379         } else if (flags & O_CREAT) {
 380                 p->o_arg.u.attrs = &p->attrs;
 381                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 382         }
 383         p->c_arg.fh = &p->o_res.fh;
 384         p->c_arg.stateid = &p->o_res.stateid;
 385         p->c_arg.seqid = p->o_arg.seqid;
 386         nfs4_init_opendata_res(p);
 387         kref_init(&p->kref);
 388         return p;
 389 err_free:
 390         kfree(p);
 391 err:
 392         dput(parent);
 393         return NULL;
 394 }
 395
 396 static void nfs4_opendata_free(struct kref *kref)
 397 {
 398         struct nfs4_opendata *p = container_of(kref,
 399                         struct nfs4_opendata, kref);
 400
 401         nfs_free_seqid(p->o_arg.seqid);
 402         if (p->state != NULL)
 403                 nfs4_put_open_state(p->state);
 404         nfs4_put_state_owner(p->owner);
 405         dput(p->dir);
 406         path_put(&p->path);
 407         kfree(p);
 408 }
 409
 410 static void nfs4_opendata_put(struct nfs4_opendata *p)
 411 {
 412         if (p != NULL)
 413                 kref_put(&p->kref, nfs4_opendata_free);
 414 }
 415
 416 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 417 {
 418         int ret;
 419
 420         ret = rpc_wait_for_completion_task(task);
 421         return ret;
 422 }
 423
 424 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 425 {
 426         int ret = 0;
 427
 428         if (open_mode & O_EXCL)
 429                 goto out;
 430         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 431                 case FMODE_READ:
 432                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 433                         break;
 434                 case FMODE_WRITE:
 435                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 436                         break;
 437                 case FMODE_READ|FMODE_WRITE:
 438                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 439         }
 440 out:
 441         return ret;
 442 }
 443
 444 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 445 {
 446         if ((delegation->type & fmode) != fmode)
 447                 return 0;
 448         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 449                 return 0;
 450         nfs_mark_delegation_referenced(delegation);
 451         return 1;
 452 }
 453
 454 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 455 {
 456         switch (fmode) {
 457                 case FMODE_WRITE:
 458                         state->n_wronly++;
 459                         break;
 460                 case FMODE_READ:
 461                         state->n_rdonly++;
 462                         break;
 463                 case FMODE_READ|FMODE_WRITE:
 464                         state->n_rdwr++;
 465         }
 466         nfs4_state_set_mode_locked(state, state->state | fmode);
 467 }
 468
 469 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 470 {
 471         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 472                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 473         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 474         switch (fmode) {
 475                 case FMODE_READ:
 476                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 477                         break;
 478                 case FMODE_WRITE:
 479                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 480                         break;
 481                 case FMODE_READ|FMODE_WRITE:
 482                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 483         }
 484 }
 485
 486 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 487 {
 488         write_seqlock(&state->seqlock);
 489         nfs_set_open_stateid_locked(state, stateid, fmode);
 490         write_sequnlock(&state->seqlock);
 491 }
 492
 493 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 494 {
 495         /*
 496          * Protect the call to nfs4_state_set_mode_locked and
 497          * serialise the stateid update
 498          */
 499         write_seqlock(&state->seqlock);
 500         if (deleg_stateid != NULL) {
 501                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 502                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 503         }
 504         if (open_stateid != NULL)
 505                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 506         write_sequnlock(&state->seqlock);
 507         spin_lock(&state->owner->so_lock);
 508         update_open_stateflags(state, fmode);
 509         spin_unlock(&state->owner->so_lock);
 510 }
 511
 512 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 513 {
 514         struct nfs_inode *nfsi = NFS_I(state->inode);
 515         struct nfs_delegation *deleg_cur;
 516         int ret = 0;
 517
 518         fmode &= (FMODE_READ|FMODE_WRITE);
 519
 520         rcu_read_lock();
 521         deleg_cur = rcu_dereference(nfsi->delegation);
 522         if (deleg_cur == NULL)
 523                 goto no_delegation;
 524
 525         spin_lock(&deleg_cur->lock);
 526         if (nfsi->delegation != deleg_cur ||
 527             (deleg_cur->type & fmode) != fmode)
 528                 goto no_delegation_unlock;
 529
 530         if (delegation == NULL)
 531                 delegation = &deleg_cur->stateid;
 532         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 533                 goto no_delegation_unlock;
 534
 535         nfs_mark_delegation_referenced(deleg_cur);
 536         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 537         ret = 1;
 538 no_delegation_unlock:
 539         spin_unlock(&deleg_cur->lock);
 540 no_delegation:
 541         rcu_read_unlock();
 542
 543         if (!ret && open_stateid != NULL) {
 544                 __update_open_stateid(state, open_stateid, NULL, fmode);
 545                 ret = 1;
 546         }
 547
 548         return ret;
 549 }
 550
 551
 552 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 553 {
 554         struct nfs_delegation *delegation;
 555
 556         rcu_read_lock();
 557         delegation = rcu_dereference(NFS_I(inode)->delegation);
 558         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 559                 rcu_read_unlock();
 560                 return;
 561         }
 562         rcu_read_unlock();
 563         nfs_inode_return_delegation(inode);
 564 }
 565
 566 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 567 {
 568         struct nfs4_state *state = opendata->state;
 569         struct nfs_inode *nfsi = NFS_I(state->inode);
 570         struct nfs_delegation *delegation;
 571         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 572         fmode_t fmode = opendata->o_arg.fmode;
 573         nfs4_stateid stateid;
 574         int ret = -EAGAIN;
 575
 576         for (;;) {
 577                 if (can_open_cached(state, fmode, open_mode)) {
 578                         spin_lock(&state->owner->so_lock);
 579                         if (can_open_cached(state, fmode, open_mode)) {
 580                                 update_open_stateflags(state, fmode);
 581                                 spin_unlock(&state->owner->so_lock);
 582                                 goto out_return_state;
 583                         }
 584                         spin_unlock(&state->owner->so_lock);
 585                 }
 586                 rcu_read_lock();
 587                 delegation = rcu_dereference(nfsi->delegation);
 588                 if (delegation == NULL ||
 589                     !can_open_delegated(delegation, fmode)) {
 590                         rcu_read_unlock();
 591                         break;
 592                 }
 593                 /* Save the delegation */
 594                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 595                 rcu_read_unlock();
 596                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 597                 if (ret != 0)
 598                         goto out;
 599                 ret = -EAGAIN;
 600
 601                 /* Try to update the stateid using the delegation */
 602                 if (update_open_stateid(state, NULL, &stateid, fmode))
 603                         goto out_return_state;
 604         }
 605 out:
 606         return ERR_PTR(ret);
 607 out_return_state:
 608         atomic_inc(&state->count);
 609         return state;
 610 }
 611
 612 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 613 {
 614         struct inode *inode;
 615         struct nfs4_state *state = NULL;
 616         struct nfs_delegation *delegation;
 617         int ret;
 618
 619         if (!data->rpc_done) {
 620                 state = nfs4_try_open_cached(data);
 621                 goto out;
 622         }
 623
 624         ret = -EAGAIN;
 625         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 626                 goto err;
 627         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 628         ret = PTR_ERR(inode);
 629         if (IS_ERR(inode))
 630                 goto err;
 631         ret = -ENOMEM;
 632         state = nfs4_get_open_state(inode, data->owner);
 633         if (state == NULL)
 634                 goto err_put_inode;
 635         if (data->o_res.delegation_type != 0) {
 636                 int delegation_flags = 0;
 637
 638                 rcu_read_lock();
 639                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 640                 if (delegation)
 641                         delegation_flags = delegation->flags;
 642                 rcu_read_unlock();
 643                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 644                         nfs_inode_set_delegation(state->inode,
 645                                         data->owner->so_cred,
 646                                         &data->o_res);
 647                 else
 648                         nfs_inode_reclaim_delegation(state->inode,
 649                                         data->owner->so_cred,
 650                                         &data->o_res);
 651         }
 652
 653         update_open_stateid(state, &data->o_res.stateid, NULL,
 654                         data->o_arg.fmode);
 655         iput(inode);
 656 out:
 657         return state;
 658 err_put_inode:
 659         iput(inode);
 660 err:
 661         return ERR_PTR(ret);
 662 }
 663
 664 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 665 {
 666         struct nfs_inode *nfsi = NFS_I(state->inode);
 667         struct nfs_open_context *ctx;
 668
 669         spin_lock(&state->inode->i_lock);
 670         list_for_each_entry(ctx, &nfsi->open_files, list) {
 671                 if (ctx->state != state)
 672                         continue;
 673                 get_nfs_open_context(ctx);
 674                 spin_unlock(&state->inode->i_lock);
 675                 return ctx;
 676         }
 677         spin_unlock(&state->inode->i_lock);
 678         return ERR_PTR(-ENOENT);
 679 }
 680
 681 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 682 {
 683         struct nfs4_opendata *opendata;
 684
 685         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
 686         if (opendata == NULL)
 687                 return ERR_PTR(-ENOMEM);
 688         opendata->state = state;
 689         atomic_inc(&state->count);
 690         return opendata;
 691 }
 692
 693 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
 694 {
 695         struct nfs4_state *newstate;
 696         int ret;
 697
 698         opendata->o_arg.open_flags = 0;
 699         opendata->o_arg.fmode = fmode;
 700         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 701         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 702         nfs4_init_opendata_res(opendata);
 703         ret = _nfs4_proc_open(opendata);
 704         if (ret != 0)
 705                 return ret;
 706         newstate = nfs4_opendata_to_nfs4_state(opendata);
 707         if (IS_ERR(newstate))
 708                 return PTR_ERR(newstate);
 709         nfs4_close_state(&opendata->path, newstate, fmode);
 710         *res = newstate;
 711         return 0;
 712 }
 713
 714 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 715 {
 716         struct nfs4_state *newstate;
 717         int ret;
 718
 719         /* memory barrier prior to reading state->n_* */
 720         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 721         smp_rmb();
 722         if (state->n_rdwr != 0) {
 723                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 724                 if (ret != 0)
 725                         return ret;
 726                 if (newstate != state)
 727                         return -ESTALE;
 728         }
 729         if (state->n_wronly != 0) {
 730                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 731                 if (ret != 0)
 732                         return ret;
 733                 if (newstate != state)
 734                         return -ESTALE;
 735         }
 736         if (state->n_rdonly != 0) {
 737                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 738                 if (ret != 0)
 739                         return ret;
 740                 if (newstate != state)
 741                         return -ESTALE;
 742         }
 743         /*
 744          * We may have performed cached opens for all three recoveries.
 745          * Check if we need to update the current stateid.
 746          */
 747         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 748             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 749                 write_seqlock(&state->seqlock);
 750                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 751                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 752                 write_sequnlock(&state->seqlock);
 753         }
 754         return 0;
 755 }
 756
 757 /*
 758  * OPEN_RECLAIM:
 759  *      reclaim state on the server after a reboot.
 760  */
 761 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 762 {
 763         struct nfs_delegation *delegation;
 764         struct nfs4_opendata *opendata;
 765         fmode_t delegation_type = 0;
 766         int status;
 767
 768         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 769         if (IS_ERR(opendata))
 770                 return PTR_ERR(opendata);
 771         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 772         opendata->o_arg.fh = NFS_FH(state->inode);
 773         rcu_read_lock();
 774         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 775         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
 776                 delegation_type = delegation->type;
 777         rcu_read_unlock();
 778         opendata->o_arg.u.delegation_type = delegation_type;
 779         status = nfs4_open_recover(opendata, state);
 780         nfs4_opendata_put(opendata);
 781         return status;
 782 }
 783
 784 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 785 {
 786         struct nfs_server *server = NFS_SERVER(state->inode);
 787         struct nfs4_exception exception = { };
 788         int err;
 789         do {
 790                 err = _nfs4_do_open_reclaim(ctx, state);
 791                 if (err != -NFS4ERR_DELAY)
 792                         break;
 793                 nfs4_handle_exception(server, err, &exception);
 794         } while (exception.retry);
 795         return err;
 796 }
 797
 798 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 799 {
 800         struct nfs_open_context *ctx;
 801         int ret;
 802
 803         ctx = nfs4_state_find_open_context(state);
 804         if (IS_ERR(ctx))
 805                 return PTR_ERR(ctx);
 806         ret = nfs4_do_open_reclaim(ctx, state);
 807         put_nfs_open_context(ctx);
 808         return ret;
 809 }
 810
 811 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 812 {
 813         struct nfs4_opendata *opendata;
 814         int ret;
 815
 816         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 817         if (IS_ERR(opendata))
 818                 return PTR_ERR(opendata);
 819         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 820         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 821                         sizeof(opendata->o_arg.u.delegation.data));
 822         ret = nfs4_open_recover(opendata, state);
 823         nfs4_opendata_put(opendata);
 824         return ret;
 825 }
 826
 827 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 828 {
 829         struct nfs4_exception exception = { };
 830         struct nfs_server *server = NFS_SERVER(state->inode);
 831         int err;
 832         do {
 833                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 834                 switch (err) {
 835                         case 0:
 836                                 return err;
 837                         case -NFS4ERR_STALE_CLIENTID:
 838                         case -NFS4ERR_STALE_STATEID:
 839                         case -NFS4ERR_EXPIRED:
 840                                 /* Don't recall a delegation if it was lost */
 841                                 nfs4_schedule_state_recovery(server->nfs_client);
 842                                 return err;
 843                 }
 844                 err = nfs4_handle_exception(server, err, &exception);
 845         } while (exception.retry);
 846         return err;
 847 }
 848
 849 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 850 {
 851         struct nfs4_opendata *data = calldata;
 852
 853         data->rpc_status = task->tk_status;
 854         if (RPC_ASSASSINATED(task))
 855                 return;
 856         if (data->rpc_status == 0) {
 857                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 858                                 sizeof(data->o_res.stateid.data));
 859                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 860                 renew_lease(data->o_res.server, data->timestamp);
 861                 data->rpc_done = 1;
 862         }
 863 }
 864
 865 static void nfs4_open_confirm_release(void *calldata)
 866 {
 867         struct nfs4_opendata *data = calldata;
 868         struct nfs4_state *state = NULL;
 869
 870         /* If this request hasn't been cancelled, do nothing */
 871         if (data->cancelled == 0)
 872                 goto out_free;
 873         /* In case of error, no cleanup! */
 874         if (!data->rpc_done)
 875                 goto out_free;
 876         state = nfs4_opendata_to_nfs4_state(data);
 877         if (!IS_ERR(state))
 878                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 879 out_free:
 880         nfs4_opendata_put(data);
 881 }
 882
 883 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 884         .rpc_call_done = nfs4_open_confirm_done,
 885         .rpc_release = nfs4_open_confirm_release,
 886 };
 887
 888 /*
 889  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 890  */
 891 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 892 {
 893         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 894         struct rpc_task *task;
 895         struct  rpc_message msg = {
 896                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 897                 .rpc_argp = &data->c_arg,
 898                 .rpc_resp = &data->c_res,
 899                 .rpc_cred = data->owner->so_cred,
 900         };
 901         struct rpc_task_setup task_setup_data = {
 902                 .rpc_client = server->client,
 903                 .rpc_message = &msg,
 904                 .callback_ops = &nfs4_open_confirm_ops,
 905                 .callback_data = data,
 906                 .workqueue = nfsiod_workqueue,
 907                 .flags = RPC_TASK_ASYNC,
 908         };
 909         int status;
 910
 911         kref_get(&data->kref);
 912         data->rpc_done = 0;
 913         data->rpc_status = 0;
 914         data->timestamp = jiffies;
 915         task = rpc_run_task(&task_setup_data);
 916         if (IS_ERR(task))
 917                 return PTR_ERR(task);
 918         status = nfs4_wait_for_completion_rpc_task(task);
 919         if (status != 0) {
 920                 data->cancelled = 1;
 921                 smp_wmb();
 922         } else
 923                 status = data->rpc_status;
 924         rpc_put_task(task);
 925         return status;
 926 }
 927
 928 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 929 {
 930         struct nfs4_opendata *data = calldata;
 931         struct nfs4_state_owner *sp = data->owner;
 932
 933         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 934                 return;
 935         /*
 936          * Check if we still need to send an OPEN call, or if we can use
 937          * a delegation instead.
 938          */
 939         if (data->state != NULL) {
 940                 struct nfs_delegation *delegation;
 941
 942                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
 943                         goto out_no_action;
 944                 rcu_read_lock();
 945                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 946                 if (delegation != NULL &&
 947                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
 948                         rcu_read_unlock();
 949                         goto out_no_action;
 950                 }
 951                 rcu_read_unlock();
 952         }
 953         /* Update sequence id. */
 954         data->o_arg.id = sp->so_owner_id.id;
 955         data->o_arg.clientid = sp->so_client->cl_clientid;
 956         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 957                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 958                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 959         }
 960         data->timestamp = jiffies;
 961         rpc_call_start(task);
 962         return;
 963 out_no_action:
 964         task->tk_action = NULL;
 965
 966 }
 967
 968 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 969 {
 970         struct nfs4_opendata *data = calldata;
 971
 972         data->rpc_status = task->tk_status;
 973         if (RPC_ASSASSINATED(task))
 974                 return;
 975         if (task->tk_status == 0) {
 976                 switch (data->o_res.f_attr->mode & S_IFMT) {
 977                         case S_IFREG:
 978                                 break;
 979                         case S_IFLNK:
 980                                 data->rpc_status = -ELOOP;
 981                                 break;
 982                         case S_IFDIR:
 983                                 data->rpc_status = -EISDIR;
 984                                 break;
 985                         default:
 986                                 data->rpc_status = -ENOTDIR;
 987                 }
 988                 renew_lease(data->o_res.server, data->timestamp);
 989                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 990                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 991         }
 992         data->rpc_done = 1;
 993 }
 994
 995 static void nfs4_open_release(void *calldata)
 996 {
 997         struct nfs4_opendata *data = calldata;
 998         struct nfs4_state *state = NULL;
 999
1000         /* If this request hasn't been cancelled, do nothing */
1001         if (data->cancelled == 0)
1002                 goto out_free;
1003         /* In case of error, no cleanup! */
1004         if (data->rpc_status != 0 || !data->rpc_done)
1005                 goto out_free;
1006         /* In case we need an open_confirm, no cleanup! */
1007         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1008                 goto out_free;
1009         state = nfs4_opendata_to_nfs4_state(data);
1010         if (!IS_ERR(state))
1011                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1012 out_free:
1013         nfs4_opendata_put(data);
1014 }
1015
1016 static const struct rpc_call_ops nfs4_open_ops = {
1017         .rpc_call_prepare = nfs4_open_prepare,
1018         .rpc_call_done = nfs4_open_done,
1019         .rpc_release = nfs4_open_release,
1020 };
1021
1022 /*
1023  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1024  */
1025 static int _nfs4_proc_open(struct nfs4_opendata *data)
1026 {
1027         struct inode *dir = data->dir->d_inode;
1028         struct nfs_server *server = NFS_SERVER(dir);
1029         struct nfs_openargs *o_arg = &data->o_arg;
1030         struct nfs_openres *o_res = &data->o_res;
1031         struct rpc_task *task;
1032         struct rpc_message msg = {
1033                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1034                 .rpc_argp = o_arg,
1035                 .rpc_resp = o_res,
1036                 .rpc_cred = data->owner->so_cred,
1037         };
1038         struct rpc_task_setup task_setup_data = {
1039                 .rpc_client = server->client,
1040                 .rpc_message = &msg,
1041                 .callback_ops = &nfs4_open_ops,
1042                 .callback_data = data,
1043                 .workqueue = nfsiod_workqueue,
1044                 .flags = RPC_TASK_ASYNC,
1045         };
1046         int status;
1047
1048         kref_get(&data->kref);
1049         data->rpc_done = 0;
1050         data->rpc_status = 0;
1051         data->cancelled = 0;
1052         task = rpc_run_task(&task_setup_data);
1053         if (IS_ERR(task))
1054                 return PTR_ERR(task);
1055         status = nfs4_wait_for_completion_rpc_task(task);
1056         if (status != 0) {
1057                 data->cancelled = 1;
1058                 smp_wmb();
1059         } else
1060                 status = data->rpc_status;
1061         rpc_put_task(task);
1062         if (status != 0 || !data->rpc_done)
1063                 return status;
1064
1065         if (o_res->fh.size == 0)
1066                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1067
1068         if (o_arg->open_flags & O_CREAT) {
1069                 update_changeattr(dir, &o_res->cinfo);
1070                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1071         } else
1072                 nfs_refresh_inode(dir, o_res->dir_attr);
1073         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1074                 status = _nfs4_proc_open_confirm(data);
1075                 if (status != 0)
1076                         return status;
1077         }
1078         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1079                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1080         return 0;
1081 }
1082
1083 static int nfs4_recover_expired_lease(struct nfs_server *server)
1084 {
1085         struct nfs_client *clp = server->nfs_client;
1086         int ret;
1087
1088         for (;;) {
1089                 ret = nfs4_wait_clnt_recover(clp);
1090                 if (ret != 0)
1091                         return ret;
1092                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1093                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1094                         break;
1095                 nfs4_schedule_state_recovery(clp);
1096         }
1097         return 0;
1098 }
1099
1100 /*
1101  * OPEN_EXPIRED:
1102  *      reclaim state on the server after a network partition.
1103  *      Assumes caller holds the appropriate lock
1104  */
1105 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1106 {
1107         struct nfs4_opendata *opendata;
1108         int ret;
1109
1110         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1111         if (IS_ERR(opendata))
1112                 return PTR_ERR(opendata);
1113         ret = nfs4_open_recover(opendata, state);
1114         if (ret == -ESTALE)
1115                 d_drop(ctx->path.dentry);
1116         nfs4_opendata_put(opendata);
1117         return ret;
1118 }
1119
1120 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1121 {
1122         struct nfs_server *server = NFS_SERVER(state->inode);
1123         struct nfs4_exception exception = { };
1124         int err;
1125
1126         do {
1127                 err = _nfs4_open_expired(ctx, state);
1128                 if (err != -NFS4ERR_DELAY)
1129                         break;
1130                 nfs4_handle_exception(server, err, &exception);
1131         } while (exception.retry);
1132         return err;
1133 }
1134
1135 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1136 {
1137         struct nfs_open_context *ctx;
1138         int ret;
1139
1140         ctx = nfs4_state_find_open_context(state);
1141         if (IS_ERR(ctx))
1142                 return PTR_ERR(ctx);
1143         ret = nfs4_do_open_expired(ctx, state);
1144         put_nfs_open_context(ctx);
1145         return ret;
1146 }
1147
1148 /*
1149  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1150  * fields corresponding to attributes that were used to store the verifier.
1151  * Make sure we clobber those fields in the later setattr call
1152  */
1153 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1154 {
1155         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1156             !(sattr->ia_valid & ATTR_ATIME_SET))
1157                 sattr->ia_valid |= ATTR_ATIME;
1158
1159         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1160             !(sattr->ia_valid & ATTR_MTIME_SET))
1161                 sattr->ia_valid |= ATTR_MTIME;
1162 }
1163
1164 /*
1165  * Returns a referenced nfs4_state
1166  */
1167 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1168 {
1169         struct nfs4_state_owner  *sp;
1170         struct nfs4_state     *state = NULL;
1171         struct nfs_server       *server = NFS_SERVER(dir);
1172         struct nfs4_opendata *opendata;
1173         int status;
1174
1175         /* Protect against reboot recovery conflicts */
1176         status = -ENOMEM;
1177         if (!(sp = nfs4_get_state_owner(server, cred))) {
1178                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1179                 goto out_err;
1180         }
1181         status = nfs4_recover_expired_lease(server);
1182         if (status != 0)
1183                 goto err_put_state_owner;
1184         if (path->dentry->d_inode != NULL)
1185                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1186         status = -ENOMEM;
1187         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1188         if (opendata == NULL)
1189                 goto err_put_state_owner;
1190
1191         if (path->dentry->d_inode != NULL)
1192                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1193
1194         status = _nfs4_proc_open(opendata);
1195         if (status != 0)
1196                 goto err_opendata_put;
1197
1198         if (opendata->o_arg.open_flags & O_EXCL)
1199                 nfs4_exclusive_attrset(opendata, sattr);
1200
1201         state = nfs4_opendata_to_nfs4_state(opendata);
1202         status = PTR_ERR(state);
1203         if (IS_ERR(state))
1204                 goto err_opendata_put;
1205         nfs4_opendata_put(opendata);
1206         nfs4_put_state_owner(sp);
1207         *res = state;
1208         return 0;
1209 err_opendata_put:
1210         nfs4_opendata_put(opendata);
1211 err_put_state_owner:
1212         nfs4_put_state_owner(sp);
1213 out_err:
1214         *res = NULL;
1215         return status;
1216 }
1217
1218
1219 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1220 {
1221         struct nfs4_exception exception = { };
1222         struct nfs4_state *res;
1223         int status;
1224
1225         do {
1226                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1227                 if (status == 0)
1228                         break;
1229                 /* NOTE: BAD_SEQID means the server and client disagree about the
1230                  * book-keeping w.r.t. state-changing operations
1231                  * (OPEN/CLOSE/LOCK/LOCKU...)
1232                  * It is actually a sign of a bug on the client or on the server.
1233                  *
1234                  * If we receive a BAD_SEQID error in the particular case of
1235                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1236                  * have unhashed the old state_owner for us, and that we can
1237                  * therefore safely retry using a new one. We should still warn
1238                  * the user though...
1239                  */
1240                 if (status == -NFS4ERR_BAD_SEQID) {
1241                         printk(KERN_WARNING "NFS: v4 server %s "
1242                                         " returned a bad sequence-id error!\n",
1243                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1244                         exception.retry = 1;
1245                         continue;
1246                 }
1247                 /*
1248                  * BAD_STATEID on OPEN means that the server cancelled our
1249                  * state before it received the OPEN_CONFIRM.
1250                  * Recover by retrying the request as per the discussion
1251                  * on Page 181 of RFC3530.
1252                  */
1253                 if (status == -NFS4ERR_BAD_STATEID) {
1254                         exception.retry = 1;
1255                         continue;
1256                 }
1257                 if (status == -EAGAIN) {
1258                         /* We must have found a delegation */
1259                         exception.retry = 1;
1260                         continue;
1261                 }
1262                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1263                                         status, &exception));
1264         } while (exception.retry);
1265         return res;
1266 }
1267
1268 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1269                             struct nfs_fattr *fattr, struct iattr *sattr,
1270                             struct nfs4_state *state)
1271 {
1272         struct nfs_server *server = NFS_SERVER(inode);
1273         struct nfs_setattrargs  arg = {
1274                 .fh             = NFS_FH(inode),
1275                 .iap            = sattr,
1276                 .server         = server,
1277                 .bitmask = server->attr_bitmask,
1278         };
1279         struct nfs_setattrres  res = {
1280                 .fattr          = fattr,
1281                 .server         = server,
1282         };
1283         struct rpc_message msg = {
1284                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1285                 .rpc_argp       = &arg,
1286                 .rpc_resp       = &res,
1287                 .rpc_cred       = cred,
1288         };
1289         unsigned long timestamp = jiffies;
1290         int status;
1291
1292         nfs_fattr_init(fattr);
1293
1294         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1295                 /* Use that stateid */
1296         } else if (state != NULL) {
1297                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1298         } else
1299                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1300
1301         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1302         if (status == 0 && state != NULL)
1303                 renew_lease(server, timestamp);
1304         return status;
1305 }
1306
1307 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1308                            struct nfs_fattr *fattr, struct iattr *sattr,
1309                            struct nfs4_state *state)
1310 {
1311         struct nfs_server *server = NFS_SERVER(inode);
1312         struct nfs4_exception exception = { };
1313         int err;
1314         do {
1315                 err = nfs4_handle_exception(server,
1316                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1317                                 &exception);
1318         } while (exception.retry);
1319         return err;
1320 }
1321
1322 struct nfs4_closedata {
1323         struct path path;
1324         struct inode *inode;
1325         struct nfs4_state *state;
1326         struct nfs_closeargs arg;
1327         struct nfs_closeres res;
1328         struct nfs_fattr fattr;
1329         unsigned long timestamp;
1330 };
1331
1332 static void nfs4_free_closedata(void *data)
1333 {
1334         struct nfs4_closedata *calldata = data;
1335         struct nfs4_state_owner *sp = calldata->state->owner;
1336
1337         nfs4_put_open_state(calldata->state);
1338         nfs_free_seqid(calldata->arg.seqid);
1339         nfs4_put_state_owner(sp);
1340         path_put(&calldata->path);
1341         kfree(calldata);
1342 }
1343
1344 static void nfs4_close_done(struct rpc_task *task, void *data)
1345 {
1346         struct nfs4_closedata *calldata = data;
1347         struct nfs4_state *state = calldata->state;
1348         struct nfs_server *server = NFS_SERVER(calldata->inode);
1349
1350         if (RPC_ASSASSINATED(task))
1351                 return;
1352         /* hmm. we are done with the inode, and in the process of freeing
1353          * the state_owner. we keep this around to process errors
1354          */
1355         switch (task->tk_status) {
1356                 case 0:
1357                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1358                         renew_lease(server, calldata->timestamp);
1359                         break;
1360                 case -NFS4ERR_STALE_STATEID:
1361                 case -NFS4ERR_OLD_STATEID:
1362                 case -NFS4ERR_BAD_STATEID:
1363                 case -NFS4ERR_EXPIRED:
1364                         if (calldata->arg.fmode == 0)
1365                                 break;
1366                 default:
1367                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1368                                 rpc_restart_call(task);
1369                                 return;
1370                         }
1371         }
1372         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1373 }
1374
1375 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1376 {
1377         struct nfs4_closedata *calldata = data;
1378         struct nfs4_state *state = calldata->state;
1379         int clear_rd, clear_wr, clear_rdwr;
1380
1381         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1382                 return;
1383
1384         clear_rd = clear_wr = clear_rdwr = 0;
1385         spin_lock(&state->owner->so_lock);
1386         /* Calculate the change in open mode */
1387         if (state->n_rdwr == 0) {
1388                 if (state->n_rdonly == 0) {
1389                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1390                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1391                 }
1392                 if (state->n_wronly == 0) {
1393                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1394                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1395                 }
1396         }
1397         spin_unlock(&state->owner->so_lock);
1398         if (!clear_rd && !clear_wr && !clear_rdwr) {
1399                 /* Note: exit _without_ calling nfs4_close_done */
1400                 task->tk_action = NULL;
1401                 return;
1402         }
1403         nfs_fattr_init(calldata->res.fattr);
1404         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1405                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1406                 calldata->arg.fmode = FMODE_READ;
1407         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1408                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1409                 calldata->arg.fmode = FMODE_WRITE;
1410         }
1411         calldata->timestamp = jiffies;
1412         rpc_call_start(task);
1413 }
1414
1415 static const struct rpc_call_ops nfs4_close_ops = {
1416         .rpc_call_prepare = nfs4_close_prepare,
1417         .rpc_call_done = nfs4_close_done,
1418         .rpc_release = nfs4_free_closedata,
1419 };
1420
1421 /*
1422  * It is possible for data to be read/written from a mem-mapped file
1423  * after the sys_close call (which hits the vfs layer as a flush).
1424  * This means that we can't safely call nfsv4 close on a file until
1425  * the inode is cleared. This in turn means that we are not good
1426  * NFSv4 citizens - we do not indicate to the server to update the file's
1427  * share state even when we are done with one of the three share
1428  * stateid's in the inode.
1429  *
1430  * NOTE: Caller must be holding the sp->so_owner semaphore!
1431  */
1432 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1433 {
1434         struct nfs_server *server = NFS_SERVER(state->inode);
1435         struct nfs4_closedata *calldata;
1436         struct nfs4_state_owner *sp = state->owner;
1437         struct rpc_task *task;
1438         struct rpc_message msg = {
1439                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1440                 .rpc_cred = state->owner->so_cred,
1441         };
1442         struct rpc_task_setup task_setup_data = {
1443                 .rpc_client = server->client,
1444                 .rpc_message = &msg,
1445                 .callback_ops = &nfs4_close_ops,
1446                 .workqueue = nfsiod_workqueue,
1447                 .flags = RPC_TASK_ASYNC,
1448         };
1449         int status = -ENOMEM;
1450
1451         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1452         if (calldata == NULL)
1453                 goto out;
1454         calldata->inode = state->inode;
1455         calldata->state = state;
1456         calldata->arg.fh = NFS_FH(state->inode);
1457         calldata->arg.stateid = &state->open_stateid;
1458         /* Serialization for the sequence id */
1459         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1460         if (calldata->arg.seqid == NULL)
1461                 goto out_free_calldata;
1462         calldata->arg.fmode = 0;
1463         calldata->arg.bitmask = server->cache_consistency_bitmask;
1464         calldata->res.fattr = &calldata->fattr;
1465         calldata->res.seqid = calldata->arg.seqid;
1466         calldata->res.server = server;
1467         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1468         calldata->path.mnt = mntget(path->mnt);
1469         calldata->path.dentry = dget(path->dentry);
1470
1471         msg.rpc_argp = &calldata->arg,
1472         msg.rpc_resp = &calldata->res,
1473         task_setup_data.callback_data = calldata;
1474         task = rpc_run_task(&task_setup_data);
1475         if (IS_ERR(task))
1476                 return PTR_ERR(task);
1477         status = 0;
1478         if (wait)
1479                 status = rpc_wait_for_completion_task(task);
1480         rpc_put_task(task);
1481         return status;
1482 out_free_calldata:
1483         kfree(calldata);
1484 out:
1485         nfs4_put_open_state(state);
1486         nfs4_put_state_owner(sp);
1487         return status;
1488 }
1489
1490 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1491 {
1492         struct file *filp;
1493         int ret;
1494
1495         /* If the open_intent is for execute, we have an extra check to make */
1496         if (fmode & FMODE_EXEC) {
1497                 ret = nfs_may_open(state->inode,
1498                                 state->owner->so_cred,
1499                                 nd->intent.open.flags);
1500                 if (ret < 0)
1501                         goto out_close;
1502         }
1503         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1504         if (!IS_ERR(filp)) {
1505                 struct nfs_open_context *ctx;
1506                 ctx = nfs_file_open_context(filp);
1507                 ctx->state = state;
1508                 return 0;
1509         }
1510         ret = PTR_ERR(filp);
1511 out_close:
1512         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1513         return ret;
1514 }
1515
1516 struct dentry *
1517 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1518 {
1519         struct path path = {
1520                 .mnt = nd->path.mnt,
1521                 .dentry = dentry,
1522         };
1523         struct dentry *parent;
1524         struct iattr attr;
1525         struct rpc_cred *cred;
1526         struct nfs4_state *state;
1527         struct dentry *res;
1528         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1529
1530         if (nd->flags & LOOKUP_CREATE) {
1531                 attr.ia_mode = nd->intent.open.create_mode;
1532                 attr.ia_valid = ATTR_MODE;
1533                 if (!IS_POSIXACL(dir))
1534                         attr.ia_mode &= ~current_umask();
1535         } else {
1536                 attr.ia_valid = 0;
1537                 BUG_ON(nd->intent.open.flags & O_CREAT);
1538         }
1539
1540         cred = rpc_lookup_cred();
1541         if (IS_ERR(cred))
1542                 return (struct dentry *)cred;
1543         parent = dentry->d_parent;
1544         /* Protect against concurrent sillydeletes */
1545         nfs_block_sillyrename(parent);
1546         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1547         put_rpccred(cred);
1548         if (IS_ERR(state)) {
1549                 if (PTR_ERR(state) == -ENOENT) {
1550                         d_add(dentry, NULL);
1551                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1552                 }
1553                 nfs_unblock_sillyrename(parent);
1554                 return (struct dentry *)state;
1555         }
1556         res = d_add_unique(dentry, igrab(state->inode));
1557         if (res != NULL)
1558                 path.dentry = res;
1559         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1560         nfs_unblock_sillyrename(parent);
1561         nfs4_intent_set_file(nd, &path, state, fmode);
1562         return res;
1563 }
1564
1565 int
1566 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1567 {
1568         struct path path = {
1569                 .mnt = nd->path.mnt,
1570                 .dentry = dentry,
1571         };
1572         struct rpc_cred *cred;
1573         struct nfs4_state *state;
1574         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1575
1576         cred = rpc_lookup_cred();
1577         if (IS_ERR(cred))
1578                 return PTR_ERR(cred);
1579         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1580         put_rpccred(cred);
1581         if (IS_ERR(state)) {
1582                 switch (PTR_ERR(state)) {
1583                         case -EPERM:
1584                         case -EACCES:
1585                         case -EDQUOT:
1586                         case -ENOSPC:
1587                         case -EROFS:
1588                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1589                                 return 1;
1590                         default:
1591                                 goto out_drop;
1592                 }
1593         }
1594         if (state->inode == dentry->d_inode) {
1595                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1596                 nfs4_intent_set_file(nd, &path, state, fmode);
1597                 return 1;
1598         }
1599         nfs4_close_sync(&path, state, fmode);
1600 out_drop:
1601         d_drop(dentry);
1602         return 0;
1603 }
1604
1605 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1606 {
1607         if (ctx->state == NULL)
1608                 return;
1609         if (is_sync)
1610                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1611         else
1612                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1613 }
1614
1615 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1616 {
1617         struct nfs4_server_caps_arg args = {
1618                 .fhandle = fhandle,
1619         };
1620         struct nfs4_server_caps_res res = {};
1621         struct rpc_message msg = {
1622                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1623                 .rpc_argp = &args,
1624                 .rpc_resp = &res,
1625         };
1626         int status;
1627
1628         status = nfs4_call_sync(server, &msg, &args, &res, 0);
1629         if (status == 0) {
1630                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1631                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1632                         server->caps |= NFS_CAP_ACLS;
1633                 if (res.has_links != 0)
1634                         server->caps |= NFS_CAP_HARDLINKS;
1635                 if (res.has_symlinks != 0)
1636                         server->caps |= NFS_CAP_SYMLINKS;
1637                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
1638                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
1639                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1640                 server->acl_bitmask = res.acl_bitmask;
1641         }
1642
1643         return status;
1644 }
1645
1646 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1647 {
1648         struct nfs4_exception exception = { };
1649         int err;
1650         do {
1651                 err = nfs4_handle_exception(server,
1652                                 _nfs4_server_capabilities(server, fhandle),
1653                                 &exception);
1654         } while (exception.retry);
1655         return err;
1656 }
1657
1658 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1659                 struct nfs_fsinfo *info)
1660 {
1661         struct nfs4_lookup_root_arg args = {
1662                 .bitmask = nfs4_fattr_bitmap,
1663         };
1664         struct nfs4_lookup_res res = {
1665                 .server = server,
1666                 .fattr = info->fattr,
1667                 .fh = fhandle,
1668         };
1669         struct rpc_message msg = {
1670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1671                 .rpc_argp = &args,
1672                 .rpc_resp = &res,
1673         };
1674         nfs_fattr_init(info->fattr);
1675         return nfs4_call_sync(server, &msg, &args, &res, 0);
1676 }
1677
1678 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1679                 struct nfs_fsinfo *info)
1680 {
1681         struct nfs4_exception exception = { };
1682         int err;
1683         do {
1684                 err = nfs4_handle_exception(server,
1685                                 _nfs4_lookup_root(server, fhandle, info),
1686                                 &exception);
1687         } while (exception.retry);
1688         return err;
1689 }
1690
1691 /*
1692  * get the file handle for the "/" directory on the server
1693  */
1694 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1695                               struct nfs_fsinfo *info)
1696 {
1697         int status;
1698
1699         status = nfs4_lookup_root(server, fhandle, info);
1700         if (status == 0)
1701                 status = nfs4_server_capabilities(server, fhandle);
1702         if (status == 0)
1703                 status = nfs4_do_fsinfo(server, fhandle, info);
1704         return nfs4_map_errors(status);
1705 }
1706
1707 /*
1708  * Get locations and (maybe) other attributes of a referral.
1709  * Note that we'll actually follow the referral later when
1710  * we detect fsid mismatch in inode revalidation
1711  */
1712 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1713 {
1714         int status = -ENOMEM;
1715         struct page *page = NULL;
1716         struct nfs4_fs_locations *locations = NULL;
1717
1718         page = alloc_page(GFP_KERNEL);
1719         if (page == NULL)
1720                 goto out;
1721         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1722         if (locations == NULL)
1723                 goto out;
1724
1725         status = nfs4_proc_fs_locations(dir, name, locations, page);
1726         if (status != 0)
1727                 goto out;
1728         /* Make sure server returned a different fsid for the referral */
1729         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1730                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
1731                 status = -EIO;
1732                 goto out;
1733         }
1734
1735         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1736         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1737         if (!fattr->mode)
1738                 fattr->mode = S_IFDIR;
1739         memset(fhandle, 0, sizeof(struct nfs_fh));
1740 out:
1741         if (page)
1742                 __free_page(page);
1743         if (locations)
1744                 kfree(locations);
1745         return status;
1746 }
1747
1748 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1749 {
1750         struct nfs4_getattr_arg args = {
1751                 .fh = fhandle,
1752                 .bitmask = server->attr_bitmask,
1753         };
1754         struct nfs4_getattr_res res = {
1755                 .fattr = fattr,
1756                 .server = server,
1757         };
1758         struct rpc_message msg = {
1759                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1760                 .rpc_argp = &args,
1761                 .rpc_resp = &res,
1762         };
1763
1764         nfs_fattr_init(fattr);
1765         return nfs4_call_sync(server, &msg, &args, &res, 0);
1766 }
1767
1768 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1769 {
1770         struct nfs4_exception exception = { };
1771         int err;
1772         do {
1773                 err = nfs4_handle_exception(server,
1774                                 _nfs4_proc_getattr(server, fhandle, fattr),
1775                                 &exception);
1776         } while (exception.retry);
1777         return err;
1778 }
1779
1780 /*
1781  * The file is not closed if it is opened due to the a request to change
1782  * the size of the file. The open call will not be needed once the
1783  * VFS layer lookup-intents are implemented.
1784  *
1785  * Close is called when the inode is destroyed.
1786  * If we haven't opened the file for O_WRONLY, we
1787  * need to in the size_change case to obtain a stateid.
1788  *
1789  * Got race?
1790  * Because OPEN is always done by name in nfsv4, it is
1791  * possible that we opened a different file by the same
1792  * name.  We can recognize this race condition, but we
1793  * can't do anything about it besides returning an error.
1794  *
1795  * This will be fixed with VFS changes (lookup-intent).
1796  */
1797 static int
1798 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1799                   struct iattr *sattr)
1800 {
1801         struct inode *inode = dentry->d_inode;
1802         struct rpc_cred *cred = NULL;
1803         struct nfs4_state *state = NULL;
1804         int status;
1805
1806         nfs_fattr_init(fattr);
1807
1808         /* Search for an existing open(O_WRITE) file */
1809         if (sattr->ia_valid & ATTR_FILE) {
1810                 struct nfs_open_context *ctx;
1811
1812                 ctx = nfs_file_open_context(sattr->ia_file);
1813                 if (ctx) {
1814                         cred = ctx->cred;
1815                         state = ctx->state;
1816                 }
1817         }
1818
1819         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
1820         if (status == 0)
1821                 nfs_setattr_update_inode(inode, sattr);
1822         return status;
1823 }
1824
1825 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1826                 const struct qstr *name, struct nfs_fh *fhandle,
1827                 struct nfs_fattr *fattr)
1828 {
1829         int                    status;
1830         struct nfs4_lookup_arg args = {
1831                 .bitmask = server->attr_bitmask,
1832                 .dir_fh = dirfh,
1833                 .name = name,
1834         };
1835         struct nfs4_lookup_res res = {
1836                 .server = server,
1837                 .fattr = fattr,
1838                 .fh = fhandle,
1839         };
1840         struct rpc_message msg = {
1841                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1842                 .rpc_argp = &args,
1843                 .rpc_resp = &res,
1844         };
1845
1846         nfs_fattr_init(fattr);
1847
1848         dprintk("NFS call  lookupfh %s\n", name->name);
1849         status = nfs4_call_sync(server, &msg, &args, &res, 0);
1850         dprintk("NFS reply lookupfh: %d\n", status);
1851         return status;
1852 }
1853
1854 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1855                               struct qstr *name, struct nfs_fh *fhandle,
1856                               struct nfs_fattr *fattr)
1857 {
1858         struct nfs4_exception exception = { };
1859         int err;
1860         do {
1861                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1862                 /* FIXME: !!!! */
1863                 if (err == -NFS4ERR_MOVED) {
1864                         err = -EREMOTE;
1865                         break;
1866                 }
1867                 err = nfs4_handle_exception(server, err, &exception);
1868         } while (exception.retry);
1869         return err;
1870 }
1871
1872 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1873                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1874 {
1875         int status;
1876
1877         dprintk("NFS call  lookup %s\n", name->name);
1878         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1879         if (status == -NFS4ERR_MOVED)
1880                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1881         dprintk("NFS reply lookup: %d\n", status);
1882         return status;
1883 }
1884
1885 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1886 {
1887         struct nfs4_exception exception = { };
1888         int err;
1889         do {
1890                 err = nfs4_handle_exception(NFS_SERVER(dir),
1891                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1892                                 &exception);
1893         } while (exception.retry);
1894         return err;
1895 }
1896
1897 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1898 {
1899         struct nfs_server *server = NFS_SERVER(inode);
1900         struct nfs_fattr fattr;
1901         struct nfs4_accessargs args = {
1902                 .fh = NFS_FH(inode),
1903                 .bitmask = server->attr_bitmask,
1904         };
1905         struct nfs4_accessres res = {
1906                 .server = server,
1907                 .fattr = &fattr,
1908         };
1909         struct rpc_message msg = {
1910                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1911                 .rpc_argp = &args,
1912                 .rpc_resp = &res,
1913                 .rpc_cred = entry->cred,
1914         };
1915         int mode = entry->mask;
1916         int status;
1917
1918         /*
1919          * Determine which access bits we want to ask for...
1920          */
1921         if (mode & MAY_READ)
1922                 args.access |= NFS4_ACCESS_READ;
1923         if (S_ISDIR(inode->i_mode)) {
1924                 if (mode & MAY_WRITE)
1925                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1926                 if (mode & MAY_EXEC)
1927                         args.access |= NFS4_ACCESS_LOOKUP;
1928         } else {
1929                 if (mode & MAY_WRITE)
1930                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1931                 if (mode & MAY_EXEC)
1932                         args.access |= NFS4_ACCESS_EXECUTE;
1933         }
1934         nfs_fattr_init(&fattr);
1935         status = nfs4_call_sync(server, &msg, &args, &res, 0);
1936         if (!status) {
1937                 entry->mask = 0;
1938                 if (res.access & NFS4_ACCESS_READ)
1939                         entry->mask |= MAY_READ;
1940                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1941                         entry->mask |= MAY_WRITE;
1942                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1943                         entry->mask |= MAY_EXEC;
1944                 nfs_refresh_inode(inode, &fattr);
1945         }
1946         return status;
1947 }
1948
1949 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1950 {
1951         struct nfs4_exception exception = { };
1952         int err;
1953         do {
1954                 err = nfs4_handle_exception(NFS_SERVER(inode),
1955                                 _nfs4_proc_access(inode, entry),
1956                                 &exception);
1957         } while (exception.retry);
1958         return err;
1959 }
1960
1961 /*
1962  * TODO: For the time being, we don't try to get any attributes
1963  * along with any of the zero-copy operations READ, READDIR,
1964  * READLINK, WRITE.
1965  *
1966  * In the case of the first three, we want to put the GETATTR
1967  * after the read-type operation -- this is because it is hard
1968  * to predict the length of a GETATTR response in v4, and thus
1969  * align the READ data correctly.  This means that the GETATTR
1970  * may end up partially falling into the page cache, and we should
1971  * shift it into the 'tail' of the xdr_buf before processing.
1972  * To do this efficiently, we need to know the total length
1973  * of data received, which doesn't seem to be available outside
1974  * of the RPC layer.
1975  *
1976  * In the case of WRITE, we also want to put the GETATTR after
1977  * the operation -- in this case because we want to make sure
1978  * we get the post-operation mtime and size.  This means that
1979  * we can't use xdr_encode_pages() as written: we need a variant
1980  * of it which would leave room in the 'tail' iovec.
1981  *
1982  * Both of these changes to the XDR layer would in fact be quite
1983  * minor, but I decided to leave them for a subsequent patch.
1984  */
1985 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1986                 unsigned int pgbase, unsigned int pglen)
1987 {
1988         struct nfs4_readlink args = {
1989                 .fh       = NFS_FH(inode),
1990                 .pgbase   = pgbase,
1991                 .pglen    = pglen,
1992                 .pages    = &page,
1993         };
1994         struct nfs4_readlink_res res;
1995         struct rpc_message msg = {
1996                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1997                 .rpc_argp = &args,
1998                 .rpc_resp = &res,
1999         };
2000
2001         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2002 }
2003
2004 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2005                 unsigned int pgbase, unsigned int pglen)
2006 {
2007         struct nfs4_exception exception = { };
2008         int err;
2009         do {
2010                 err = nfs4_handle_exception(NFS_SERVER(inode),
2011                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2012                                 &exception);
2013         } while (exception.retry);
2014         return err;
2015 }
2016
2017 /*
2018  * Got race?
2019  * We will need to arrange for the VFS layer to provide an atomic open.
2020  * Until then, this create/open method is prone to inefficiency and race
2021  * conditions due to the lookup, create, and open VFS calls from sys_open()
2022  * placed on the wire.
2023  *
2024  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2025  * The file will be opened again in the subsequent VFS open call
2026  * (nfs4_proc_file_open).
2027  *
2028  * The open for read will just hang around to be used by any process that
2029  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2030  */
2031
2032 static int
2033 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2034                  int flags, struct nameidata *nd)
2035 {
2036         struct path path = {
2037                 .mnt = nd->path.mnt,
2038                 .dentry = dentry,
2039         };
2040         struct nfs4_state *state;
2041         struct rpc_cred *cred;
2042         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2043         int status = 0;
2044
2045         cred = rpc_lookup_cred();
2046         if (IS_ERR(cred)) {
2047                 status = PTR_ERR(cred);
2048                 goto out;
2049         }
2050         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2051         d_drop(dentry);
2052         if (IS_ERR(state)) {
2053                 status = PTR_ERR(state);
2054                 goto out_putcred;
2055         }
2056         d_add(dentry, igrab(state->inode));
2057         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2058         if (flags & O_EXCL) {
2059                 struct nfs_fattr fattr;
2060                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2061                 if (status == 0)
2062                         nfs_setattr_update_inode(state->inode, sattr);
2063                 nfs_post_op_update_inode(state->inode, &fattr);
2064         }
2065         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2066                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2067         else
2068                 nfs4_close_sync(&path, state, fmode);
2069 out_putcred:
2070         put_rpccred(cred);
2071 out:
2072         return status;
2073 }
2074
2075 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2076 {
2077         struct nfs_server *server = NFS_SERVER(dir);
2078         struct nfs_removeargs args = {
2079                 .fh = NFS_FH(dir),
2080                 .name.len = name->len,
2081                 .name.name = name->name,
2082                 .bitmask = server->attr_bitmask,
2083         };
2084         struct nfs_removeres res = {
2085                 .server = server,
2086         };
2087         struct rpc_message msg = {
2088                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2089                 .rpc_argp = &args,
2090                 .rpc_resp = &res,
2091         };
2092         int                     status;
2093
2094         nfs_fattr_init(&res.dir_attr);
2095         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2096         if (status == 0) {
2097                 update_changeattr(dir, &res.cinfo);
2098                 nfs_post_op_update_inode(dir, &res.dir_attr);
2099         }
2100         return status;
2101 }
2102
2103 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2104 {
2105         struct nfs4_exception exception = { };
2106         int err;
2107         do {
2108                 err = nfs4_handle_exception(NFS_SERVER(dir),
2109                                 _nfs4_proc_remove(dir, name),
2110                                 &exception);
2111         } while (exception.retry);
2112         return err;
2113 }
2114
2115 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2116 {
2117         struct nfs_server *server = NFS_SERVER(dir);
2118         struct nfs_removeargs *args = msg->rpc_argp;
2119         struct nfs_removeres *res = msg->rpc_resp;
2120
2121         args->bitmask = server->cache_consistency_bitmask;
2122         res->server = server;
2123         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2124 }
2125
2126 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2127 {
2128         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2129
2130         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2131                 return 0;
2132         update_changeattr(dir, &res->cinfo);
2133         nfs_post_op_update_inode(dir, &res->dir_attr);
2134         return 1;
2135 }
2136
2137 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2138                 struct inode *new_dir, struct qstr *new_name)
2139 {
2140         struct nfs_server *server = NFS_SERVER(old_dir);
2141         struct nfs4_rename_arg arg = {
2142                 .old_dir = NFS_FH(old_dir),
2143                 .new_dir = NFS_FH(new_dir),
2144                 .old_name = old_name,
2145                 .new_name = new_name,
2146                 .bitmask = server->attr_bitmask,
2147         };
2148         struct nfs_fattr old_fattr, new_fattr;
2149         struct nfs4_rename_res res = {
2150                 .server = server,
2151                 .old_fattr = &old_fattr,
2152                 .new_fattr = &new_fattr,
2153         };
2154         struct rpc_message msg = {
2155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2156                 .rpc_argp = &arg,
2157                 .rpc_resp = &res,
2158         };
2159         int                     status;
2160
2161         nfs_fattr_init(res.old_fattr);
2162         nfs_fattr_init(res.new_fattr);
2163         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2164
2165         if (!status) {
2166                 update_changeattr(old_dir, &res.old_cinfo);
2167                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2168                 update_changeattr(new_dir, &res.new_cinfo);
2169                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2170         }
2171         return status;
2172 }
2173
2174 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2175                 struct inode *new_dir, struct qstr *new_name)
2176 {
2177         struct nfs4_exception exception = { };
2178         int err;
2179         do {
2180                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2181                                 _nfs4_proc_rename(old_dir, old_name,
2182                                         new_dir, new_name),
2183                                 &exception);
2184         } while (exception.retry);
2185         return err;
2186 }
2187
2188 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2189 {
2190         struct nfs_server *server = NFS_SERVER(inode);
2191         struct nfs4_link_arg arg = {
2192                 .fh     = NFS_FH(inode),
2193                 .dir_fh = NFS_FH(dir),
2194                 .name   = name,
2195                 .bitmask = server->attr_bitmask,
2196         };
2197         struct nfs_fattr fattr, dir_attr;
2198         struct nfs4_link_res res = {
2199                 .server = server,
2200                 .fattr = &fattr,
2201                 .dir_attr = &dir_attr,
2202         };
2203         struct rpc_message msg = {
2204                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2205                 .rpc_argp = &arg,
2206                 .rpc_resp = &res,
2207         };
2208         int                     status;
2209
2210         nfs_fattr_init(res.fattr);
2211         nfs_fattr_init(res.dir_attr);
2212         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2213         if (!status) {
2214                 update_changeattr(dir, &res.cinfo);
2215                 nfs_post_op_update_inode(dir, res.dir_attr);
2216                 nfs_post_op_update_inode(inode, res.fattr);
2217         }
2218
2219         return status;
2220 }
2221
2222 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2223 {
2224         struct nfs4_exception exception = { };
2225         int err;
2226         do {
2227                 err = nfs4_handle_exception(NFS_SERVER(inode),
2228                                 _nfs4_proc_link(inode, dir, name),
2229                                 &exception);
2230         } while (exception.retry);
2231         return err;
2232 }
2233
2234 struct nfs4_createdata {
2235         struct rpc_message msg;
2236         struct nfs4_create_arg arg;
2237         struct nfs4_create_res res;
2238         struct nfs_fh fh;
2239         struct nfs_fattr fattr;
2240         struct nfs_fattr dir_fattr;
2241 };
2242
2243 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2244                 struct qstr *name, struct iattr *sattr, u32 ftype)
2245 {
2246         struct nfs4_createdata *data;
2247
2248         data = kzalloc(sizeof(*data), GFP_KERNEL);
2249         if (data != NULL) {
2250                 struct nfs_server *server = NFS_SERVER(dir);
2251
2252                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2253                 data->msg.rpc_argp = &data->arg;
2254                 data->msg.rpc_resp = &data->res;
2255                 data->arg.dir_fh = NFS_FH(dir);
2256                 data->arg.server = server;
2257                 data->arg.name = name;
2258                 data->arg.attrs = sattr;
2259                 data->arg.ftype = ftype;
2260                 data->arg.bitmask = server->attr_bitmask;
2261                 data->res.server = server;
2262                 data->res.fh = &data->fh;
2263                 data->res.fattr = &data->fattr;
2264                 data->res.dir_fattr = &data->dir_fattr;
2265                 nfs_fattr_init(data->res.fattr);
2266                 nfs_fattr_init(data->res.dir_fattr);
2267         }
2268         return data;
2269 }
2270
2271 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2272 {
2273         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2274                                     &data->arg, &data->res, 1);
2275         if (status == 0) {
2276                 update_changeattr(dir, &data->res.dir_cinfo);
2277                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2278                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2279         }
2280         return status;
2281 }
2282
2283 static void nfs4_free_createdata(struct nfs4_createdata *data)
2284 {
2285         kfree(data);
2286 }
2287
2288 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2289                 struct page *page, unsigned int len, struct iattr *sattr)
2290 {
2291         struct nfs4_createdata *data;
2292         int status = -ENAMETOOLONG;
2293
2294         if (len > NFS4_MAXPATHLEN)
2295                 goto out;
2296
2297         status = -ENOMEM;
2298         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2299         if (data == NULL)
2300                 goto out;
2301
2302         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2303         data->arg.u.symlink.pages = &page;
2304         data->arg.u.symlink.len = len;
2305
2306         status = nfs4_do_create(dir, dentry, data);
2307
2308         nfs4_free_createdata(data);
2309 out:
2310         return status;
2311 }
2312
2313 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2314                 struct page *page, unsigned int len, struct iattr *sattr)
2315 {
2316         struct nfs4_exception exception = { };
2317         int err;
2318         do {
2319                 err = nfs4_handle_exception(NFS_SERVER(dir),
2320                                 _nfs4_proc_symlink(dir, dentry, page,
2321                                                         len, sattr),
2322                                 &exception);
2323         } while (exception.retry);
2324         return err;
2325 }
2326
2327 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2328                 struct iattr *sattr)
2329 {
2330         struct nfs4_createdata *data;
2331         int status = -ENOMEM;
2332
2333         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2334         if (data == NULL)
2335                 goto out;
2336
2337         status = nfs4_do_create(dir, dentry, data);
2338
2339         nfs4_free_createdata(data);
2340 out:
2341         return status;
2342 }
2343
2344 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2345                 struct iattr *sattr)
2346 {
2347         struct nfs4_exception exception = { };
2348         int err;
2349         do {
2350                 err = nfs4_handle_exception(NFS_SERVER(dir),
2351                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2352                                 &exception);
2353         } while (exception.retry);
2354         return err;
2355 }
2356
2357 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2358                   u64 cookie, struct page *page, unsigned int count, int plus)
2359 {
2360         struct inode            *dir = dentry->d_inode;
2361         struct nfs4_readdir_arg args = {
2362                 .fh = NFS_FH(dir),
2363                 .pages = &page,
2364                 .pgbase = 0,
2365                 .count = count,
2366                 .bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
2367         };
2368         struct nfs4_readdir_res res;
2369         struct rpc_message msg = {
2370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2371                 .rpc_argp = &args,
2372                 .rpc_resp = &res,
2373                 .rpc_cred = cred,
2374         };
2375         int                     status;
2376
2377         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2378                         dentry->d_parent->d_name.name,
2379                         dentry->d_name.name,
2380                         (unsigned long long)cookie);
2381         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2382         res.pgbase = args.pgbase;
2383         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2384         if (status == 0)
2385                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2386
2387         nfs_invalidate_atime(dir);
2388
2389         dprintk("%s: returns %d\n", __func__, status);
2390         return status;
2391 }
2392
2393 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2394                   u64 cookie, struct page *page, unsigned int count, int plus)
2395 {
2396         struct nfs4_exception exception = { };
2397         int err;
2398         do {
2399                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2400                                 _nfs4_proc_readdir(dentry, cred, cookie,
2401                                         page, count, plus),
2402                                 &exception);
2403         } while (exception.retry);
2404         return err;
2405 }
2406
2407 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2408                 struct iattr *sattr, dev_t rdev)
2409 {
2410         struct nfs4_createdata *data;
2411         int mode = sattr->ia_mode;
2412         int status = -ENOMEM;
2413
2414         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2415         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2416
2417         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2418         if (data == NULL)
2419                 goto out;
2420
2421         if (S_ISFIFO(mode))
2422                 data->arg.ftype = NF4FIFO;
2423         else if (S_ISBLK(mode)) {
2424                 data->arg.ftype = NF4BLK;
2425                 data->arg.u.device.specdata1 = MAJOR(rdev);
2426                 data->arg.u.device.specdata2 = MINOR(rdev);
2427         }
2428         else if (S_ISCHR(mode)) {
2429                 data->arg.ftype = NF4CHR;
2430                 data->arg.u.device.specdata1 = MAJOR(rdev);
2431                 data->arg.u.device.specdata2 = MINOR(rdev);
2432         }
2433
2434         status = nfs4_do_create(dir, dentry, data);
2435
2436         nfs4_free_createdata(data);
2437 out:
2438         return status;
2439 }
2440
2441 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2442                 struct iattr *sattr, dev_t rdev)
2443 {
2444         struct nfs4_exception exception = { };
2445         int err;
2446         do {
2447                 err = nfs4_handle_exception(NFS_SERVER(dir),
2448                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2449                                 &exception);
2450         } while (exception.retry);
2451         return err;
2452 }
2453
2454 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2455                  struct nfs_fsstat *fsstat)
2456 {
2457         struct nfs4_statfs_arg args = {
2458                 .fh = fhandle,
2459                 .bitmask = server->attr_bitmask,
2460         };
2461         struct nfs4_statfs_res res = {
2462                 .fsstat = fsstat,
2463         };
2464         struct rpc_message msg = {
2465                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2466                 .rpc_argp = &args,
2467                 .rpc_resp = &res,
2468         };
2469
2470         nfs_fattr_init(fsstat->fattr);
2471         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2472 }
2473
2474 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2475 {
2476         struct nfs4_exception exception = { };
2477         int err;
2478         do {
2479                 err = nfs4_handle_exception(server,
2480                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2481                                 &exception);
2482         } while (exception.retry);
2483         return err;
2484 }
2485
2486 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2487                 struct nfs_fsinfo *fsinfo)
2488 {
2489         struct nfs4_fsinfo_arg args = {
2490                 .fh = fhandle,
2491                 .bitmask = server->attr_bitmask,
2492         };
2493         struct nfs4_fsinfo_res res = {
2494                 .fsinfo = fsinfo,
2495         };
2496         struct rpc_message msg = {
2497                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2498                 .rpc_argp = &args,
2499                 .rpc_resp = &res,
2500         };
2501
2502         return nfs4_call_sync(server, &msg, &args, &res, 0);
2503 }
2504
2505 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2506 {
2507         struct nfs4_exception exception = { };
2508         int err;
2509
2510         do {
2511                 err = nfs4_handle_exception(server,
2512                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2513                                 &exception);
2514         } while (exception.retry);
2515         return err;
2516 }
2517
2518 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2519 {
2520         nfs_fattr_init(fsinfo->fattr);
2521         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2522 }
2523
2524 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2525                 struct nfs_pathconf *pathconf)
2526 {
2527         struct nfs4_pathconf_arg args = {
2528                 .fh = fhandle,
2529                 .bitmask = server->attr_bitmask,
2530         };
2531         struct nfs4_pathconf_res res = {
2532                 .pathconf = pathconf,
2533         };
2534         struct rpc_message msg = {
2535                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2536                 .rpc_argp = &args,
2537                 .rpc_resp = &res,
2538         };
2539
2540         /* None of the pathconf attributes are mandatory to implement */
2541         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2542                 memset(pathconf, 0, sizeof(*pathconf));
2543                 return 0;
2544         }
2545
2546         nfs_fattr_init(pathconf->fattr);
2547         return nfs4_call_sync(server, &msg, &args, &res, 0);
2548 }
2549
2550 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2551                 struct nfs_pathconf *pathconf)
2552 {
2553         struct nfs4_exception exception = { };
2554         int err;
2555
2556         do {
2557                 err = nfs4_handle_exception(server,
2558                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2559                                 &exception);
2560         } while (exception.retry);
2561         return err;
2562 }
2563
2564 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2565 {
2566         struct nfs_server *server = NFS_SERVER(data->inode);
2567
2568         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2569                 rpc_restart_call(task);
2570                 return -EAGAIN;
2571         }
2572
2573         nfs_invalidate_atime(data->inode);
2574         if (task->tk_status > 0)
2575                 renew_lease(server, data->timestamp);
2576         return 0;
2577 }
2578
2579 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2580 {
2581         data->timestamp   = jiffies;
2582         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2583 }
2584
2585 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2586 {
2587         struct inode *inode = data->inode;
2588
2589         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2590                 rpc_restart_call(task);
2591                 return -EAGAIN;
2592         }
2593         if (task->tk_status >= 0) {
2594                 renew_lease(NFS_SERVER(inode), data->timestamp);
2595                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2596         }
2597         return 0;
2598 }
2599
2600 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2601 {
2602         struct nfs_server *server = NFS_SERVER(data->inode);
2603
2604         data->args.bitmask = server->cache_consistency_bitmask;
2605         data->res.server = server;
2606         data->timestamp   = jiffies;
2607
2608         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2609 }
2610
2611 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2612 {
2613         struct inode *inode = data->inode;
2614
2615         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2616                 rpc_restart_call(task);
2617                 return -EAGAIN;
2618         }
2619         nfs_refresh_inode(inode, data->res.fattr);
2620         return 0;
2621 }
2622
2623 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2624 {
2625         struct nfs_server *server = NFS_SERVER(data->inode);
2626
2627         data->args.bitmask = server->cache_consistency_bitmask;
2628         data->res.server = server;
2629         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2630 }
2631
2632 /*
2633  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2634  * standalone procedure for queueing an asynchronous RENEW.
2635  */
2636 static void nfs4_renew_done(struct rpc_task *task, void *data)
2637 {
2638         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2639         unsigned long timestamp = (unsigned long)data;
2640
2641         if (task->tk_status < 0) {
2642                 /* Unless we're shutting down, schedule state recovery! */
2643                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
2644                         nfs4_schedule_state_recovery(clp);
2645                 return;
2646         }
2647         spin_lock(&clp->cl_lock);
2648         if (time_before(clp->cl_last_renewal,timestamp))
2649                 clp->cl_last_renewal = timestamp;
2650         spin_unlock(&clp->cl_lock);
2651 }
2652
2653 static const struct rpc_call_ops nfs4_renew_ops = {
2654         .rpc_call_done = nfs4_renew_done,
2655 };
2656
2657 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2658 {
2659         struct rpc_message msg = {
2660                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2661                 .rpc_argp       = clp,
2662                 .rpc_cred       = cred,
2663         };
2664
2665         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2666                         &nfs4_renew_ops, (void *)jiffies);
2667 }
2668
2669 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2670 {
2671         struct rpc_message msg = {
2672                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2673                 .rpc_argp       = clp,
2674                 .rpc_cred       = cred,
2675         };
2676         unsigned long now = jiffies;
2677         int status;
2678
2679         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2680         if (status < 0)
2681                 return status;
2682         spin_lock(&clp->cl_lock);
2683         if (time_before(clp->cl_last_renewal,now))
2684                 clp->cl_last_renewal = now;
2685         spin_unlock(&clp->cl_lock);
2686         return 0;
2687 }
2688
2689 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2690 {
2691         return (server->caps & NFS_CAP_ACLS)
2692                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2693                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2694 }
2695
2696 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2697  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2698  * the stack.
2699  */
2700 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2701
2702 static void buf_to_pages(const void *buf, size_t buflen,
2703                 struct page **pages, unsigned int *pgbase)
2704 {
2705         const void *p = buf;
2706
2707         *pgbase = offset_in_page(buf);
2708         p -= *pgbase;
2709         while (p < buf + buflen) {
2710                 *(pages++) = virt_to_page(p);
2711                 p += PAGE_CACHE_SIZE;
2712         }
2713 }
2714
2715 struct nfs4_cached_acl {
2716         int cached;
2717         size_t len;
2718         char data[0];
2719 };
2720
2721 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2722 {
2723         struct nfs_inode *nfsi = NFS_I(inode);
2724
2725         spin_lock(&inode->i_lock);
2726         kfree(nfsi->nfs4_acl);
2727         nfsi->nfs4_acl = acl;
2728         spin_unlock(&inode->i_lock);
2729 }
2730
2731 static void nfs4_zap_acl_attr(struct inode *inode)
2732 {
2733         nfs4_set_cached_acl(inode, NULL);
2734 }
2735
2736 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2737 {
2738         struct nfs_inode *nfsi = NFS_I(inode);
2739         struct nfs4_cached_acl *acl;
2740         int ret = -ENOENT;
2741
2742         spin_lock(&inode->i_lock);
2743         acl = nfsi->nfs4_acl;
2744         if (acl == NULL)
2745                 goto out;
2746         if (buf == NULL) /* user is just asking for length */
2747                 goto out_len;
2748         if (acl->cached == 0)
2749                 goto out;
2750         ret = -ERANGE; /* see getxattr(2) man page */
2751         if (acl->len > buflen)
2752                 goto out;
2753         memcpy(buf, acl->data, acl->len);
2754 out_len:
2755         ret = acl->len;
2756 out:
2757         spin_unlock(&inode->i_lock);
2758         return ret;
2759 }
2760
2761 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2762 {
2763         struct nfs4_cached_acl *acl;
2764
2765         if (buf && acl_len <= PAGE_SIZE) {
2766                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2767                 if (acl == NULL)
2768                         goto out;
2769                 acl->cached = 1;
2770                 memcpy(acl->data, buf, acl_len);
2771         } else {
2772                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2773                 if (acl == NULL)
2774                         goto out;
2775                 acl->cached = 0;
2776         }
2777         acl->len = acl_len;
2778 out:
2779         nfs4_set_cached_acl(inode, acl);
2780 }
2781
2782 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2783 {
2784         struct page *pages[NFS4ACL_MAXPAGES];
2785         struct nfs_getaclargs args = {
2786                 .fh = NFS_FH(inode),
2787                 .acl_pages = pages,
2788                 .acl_len = buflen,
2789         };
2790         struct nfs_getaclres res = {
2791                 .acl_len = buflen,
2792         };
2793         void *resp_buf;
2794         struct rpc_message msg = {
2795                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2796                 .rpc_argp = &args,
2797                 .rpc_resp = &res,
2798         };
2799         struct page *localpage = NULL;
2800         int ret;
2801
2802         if (buflen < PAGE_SIZE) {
2803                 /* As long as we're doing a round trip to the server anyway,
2804                  * let's be prepared for a page of acl data. */
2805                 localpage = alloc_page(GFP_KERNEL);
2806                 resp_buf = page_address(localpage);
2807                 if (localpage == NULL)
2808                         return -ENOMEM;
2809                 args.acl_pages[0] = localpage;
2810                 args.acl_pgbase = 0;
2811                 args.acl_len = PAGE_SIZE;
2812         } else {
2813                 resp_buf = buf;
2814                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2815         }
2816         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2817         if (ret)
2818                 goto out_free;
2819         if (res.acl_len > args.acl_len)
2820                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
2821         else
2822                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
2823         if (buf) {
2824                 ret = -ERANGE;
2825                 if (res.acl_len > buflen)
2826                         goto out_free;
2827                 if (localpage)
2828                         memcpy(buf, resp_buf, res.acl_len);
2829         }
2830         ret = res.acl_len;
2831 out_free:
2832         if (localpage)
2833                 __free_page(localpage);
2834         return ret;
2835 }
2836
2837 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2838 {
2839         struct nfs4_exception exception = { };
2840         ssize_t ret;
2841         do {
2842                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2843                 if (ret >= 0)
2844                         break;
2845                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2846         } while (exception.retry);
2847         return ret;
2848 }
2849
2850 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2851 {
2852         struct nfs_server *server = NFS_SERVER(inode);
2853         int ret;
2854
2855         if (!nfs4_server_supports_acls(server))
2856                 return -EOPNOTSUPP;
2857         ret = nfs_revalidate_inode(server, inode);
2858         if (ret < 0)
2859                 return ret;
2860         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2861                 nfs_zap_acl_cache(inode);
2862         ret = nfs4_read_cached_acl(inode, buf, buflen);
2863         if (ret != -ENOENT)
2864                 return ret;
2865         return nfs4_get_acl_uncached(inode, buf, buflen);
2866 }
2867
2868 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2869 {
2870         struct nfs_server *server = NFS_SERVER(inode);
2871         struct page *pages[NFS4ACL_MAXPAGES];
2872         struct nfs_setaclargs arg = {
2873                 .fh             = NFS_FH(inode),
2874                 .acl_pages      = pages,
2875                 .acl_len        = buflen,
2876         };
2877         struct nfs_setaclres res;
2878         struct rpc_message msg = {
2879                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2880                 .rpc_argp       = &arg,
2881                 .rpc_resp       = &res,
2882         };
2883         int ret;
2884
2885         if (!nfs4_server_supports_acls(server))
2886                 return -EOPNOTSUPP;
2887         nfs_inode_return_delegation(inode);
2888         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2889         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
2890         nfs_access_zap_cache(inode);
2891         nfs_zap_acl_cache(inode);
2892         return ret;
2893 }
2894
2895 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2896 {
2897         struct nfs4_exception exception = { };
2898         int err;
2899         do {
2900                 err = nfs4_handle_exception(NFS_SERVER(inode),
2901                                 __nfs4_proc_set_acl(inode, buf, buflen),
2902                                 &exception);
2903         } while (exception.retry);
2904         return err;
2905 }
2906
2907 static int
2908 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
2909 {
2910         struct nfs_client *clp = server->nfs_client;
2911
2912         if (!clp || task->tk_status >= 0)
2913                 return 0;
2914         switch(task->tk_status) {
2915                 case -NFS4ERR_ADMIN_REVOKED:
2916                 case -NFS4ERR_BAD_STATEID:
2917                 case -NFS4ERR_OPENMODE:
2918                         if (state == NULL)
2919                                 break;
2920                         nfs4_state_mark_reclaim_nograce(clp, state);
2921                 case -NFS4ERR_STALE_CLIENTID:
2922                 case -NFS4ERR_STALE_STATEID:
2923                 case -NFS4ERR_EXPIRED:
2924                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2925                         nfs4_schedule_state_recovery(clp);
2926                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
2927                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2928                         task->tk_status = 0;
2929                         return -EAGAIN;
2930                 case -NFS4ERR_DELAY:
2931                         nfs_inc_server_stats(server, NFSIOS_DELAY);
2932                 case -NFS4ERR_GRACE:
2933                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2934                         task->tk_status = 0;
2935                         return -EAGAIN;
2936                 case -NFS4ERR_OLD_STATEID:
2937                         task->tk_status = 0;
2938                         return -EAGAIN;
2939         }
2940         task->tk_status = nfs4_map_errors(task->tk_status);
2941         return 0;
2942 }
2943
2944 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2945 {
2946         nfs4_verifier sc_verifier;
2947         struct nfs4_setclientid setclientid = {
2948                 .sc_verifier = &sc_verifier,
2949                 .sc_prog = program,
2950         };
2951         struct rpc_message msg = {
2952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2953                 .rpc_argp = &setclientid,
2954                 .rpc_resp = clp,
2955                 .rpc_cred = cred,
2956         };
2957         __be32 *p;
2958         int loop = 0;
2959         int status;
2960
2961         p = (__be32*)sc_verifier.data;
2962         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2963         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2964
2965         for(;;) {
2966                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2967                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2968                                 clp->cl_ipaddr,
2969                                 rpc_peeraddr2str(clp->cl_rpcclient,
2970                                                         RPC_DISPLAY_ADDR),
2971                                 rpc_peeraddr2str(clp->cl_rpcclient,
2972                                                         RPC_DISPLAY_PROTO),
2973                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
2974                                 clp->cl_id_uniquifier);
2975                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2976                                 sizeof(setclientid.sc_netid),
2977                                 rpc_peeraddr2str(clp->cl_rpcclient,
2978                                                         RPC_DISPLAY_NETID));
2979                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2980                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2981                                 clp->cl_ipaddr, port >> 8, port & 255);
2982
2983                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2984                 if (status != -NFS4ERR_CLID_INUSE)
2985                         break;
2986                 if (signalled())
2987                         break;
2988                 if (loop++ & 1)
2989                         ssleep(clp->cl_lease_time + 1);
2990                 else
2991                         if (++clp->cl_id_uniquifier == 0)
2992                                 break;
2993         }
2994         return status;
2995 }
2996
2997 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2998 {
2999         struct nfs_fsinfo fsinfo;
3000         struct rpc_message msg = {
3001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3002                 .rpc_argp = clp,
3003                 .rpc_resp = &fsinfo,
3004                 .rpc_cred = cred,
3005         };
3006         unsigned long now;
3007         int status;
3008
3009         now = jiffies;
3010         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3011         if (status == 0) {
3012                 spin_lock(&clp->cl_lock);
3013                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3014                 clp->cl_last_renewal = now;
3015                 spin_unlock(&clp->cl_lock);
3016         }
3017         return status;
3018 }
3019
3020 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3021 {
3022         long timeout = 0;
3023         int err;
3024         do {
3025                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3026                 switch (err) {
3027                         case 0:
3028                                 return err;
3029                         case -NFS4ERR_RESOURCE:
3030                                 /* The IBM lawyers misread another document! */
3031                         case -NFS4ERR_DELAY:
3032                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3033                 }
3034         } while (err == 0);
3035         return err;
3036 }
3037
3038 struct nfs4_delegreturndata {
3039         struct nfs4_delegreturnargs args;
3040         struct nfs4_delegreturnres res;
3041         struct nfs_fh fh;
3042         nfs4_stateid stateid;
3043         unsigned long timestamp;
3044         struct nfs_fattr fattr;
3045         int rpc_status;
3046 };
3047
3048 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3049 {
3050         struct nfs4_delegreturndata *data = calldata;
3051         data->rpc_status = task->tk_status;
3052         if (data->rpc_status == 0)
3053                 renew_lease(data->res.server, data->timestamp);
3054 }
3055
3056 static void nfs4_delegreturn_release(void *calldata)
3057 {
3058         kfree(calldata);
3059 }
3060
3061 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3062         .rpc_call_done = nfs4_delegreturn_done,
3063         .rpc_release = nfs4_delegreturn_release,
3064 };
3065
3066 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3067 {
3068         struct nfs4_delegreturndata *data;
3069         struct nfs_server *server = NFS_SERVER(inode);
3070         struct rpc_task *task;
3071         struct rpc_message msg = {
3072                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3073                 .rpc_cred = cred,
3074         };
3075         struct rpc_task_setup task_setup_data = {
3076                 .rpc_client = server->client,
3077                 .rpc_message = &msg,
3078                 .callback_ops = &nfs4_delegreturn_ops,
3079                 .flags = RPC_TASK_ASYNC,
3080         };
3081         int status = 0;
3082
3083         data = kmalloc(sizeof(*data), GFP_KERNEL);
3084         if (data == NULL)
3085                 return -ENOMEM;
3086         data->args.fhandle = &data->fh;
3087         data->args.stateid = &data->stateid;
3088         data->args.bitmask = server->attr_bitmask;
3089         nfs_copy_fh(&data->fh, NFS_FH(inode));
3090         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3091         data->res.fattr = &data->fattr;
3092         data->res.server = server;
3093         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3094         nfs_fattr_init(data->res.fattr);
3095         data->timestamp = jiffies;
3096         data->rpc_status = 0;
3097
3098         task_setup_data.callback_data = data;
3099         msg.rpc_argp = &data->args,
3100         msg.rpc_resp = &data->res,
3101         task = rpc_run_task(&task_setup_data);
3102         if (IS_ERR(task))
3103                 return PTR_ERR(task);
3104         if (!issync)
3105                 goto out;
3106         status = nfs4_wait_for_completion_rpc_task(task);
3107         if (status != 0)
3108                 goto out;
3109         status = data->rpc_status;
3110         if (status != 0)
3111                 goto out;
3112         nfs_refresh_inode(inode, &data->fattr);
3113 out:
3114         rpc_put_task(task);
3115         return status;
3116 }
3117
3118 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3119 {
3120         struct nfs_server *server = NFS_SERVER(inode);
3121         struct nfs4_exception exception = { };
3122         int err;
3123         do {
3124                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3125                 switch (err) {
3126                         case -NFS4ERR_STALE_STATEID:
3127                         case -NFS4ERR_EXPIRED:
3128                         case 0:
3129                                 return 0;
3130                 }
3131                 err = nfs4_handle_exception(server, err, &exception);
3132         } while (exception.retry);
3133         return err;
3134 }
3135
3136 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3137 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3138
3139 /*
3140  * sleep, with exponential backoff, and retry the LOCK operation.
3141  */
3142 static unsigned long
3143 nfs4_set_lock_task_retry(unsigned long timeout)
3144 {
3145         schedule_timeout_killable(timeout);
3146         timeout <<= 1;
3147         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3148                 return NFS4_LOCK_MAXTIMEOUT;
3149         return timeout;
3150 }
3151
3152 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3153 {
3154         struct inode *inode = state->inode;
3155         struct nfs_server *server = NFS_SERVER(inode);
3156         struct nfs_client *clp = server->nfs_client;
3157         struct nfs_lockt_args arg = {
3158                 .fh = NFS_FH(inode),
3159                 .fl = request,
3160         };
3161         struct nfs_lockt_res res = {
3162                 .denied = request,
3163         };
3164         struct rpc_message msg = {
3165                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3166                 .rpc_argp       = &arg,
3167                 .rpc_resp       = &res,
3168                 .rpc_cred       = state->owner->so_cred,
3169         };
3170         struct nfs4_lock_state *lsp;
3171         int status;
3172
3173         arg.lock_owner.clientid = clp->cl_clientid;
3174         status = nfs4_set_lock_state(state, request);
3175         if (status != 0)
3176                 goto out;
3177         lsp = request->fl_u.nfs4_fl.owner;
3178         arg.lock_owner.id = lsp->ls_id.id;
3179         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3180         switch (status) {
3181                 case 0:
3182                         request->fl_type = F_UNLCK;
3183                         break;
3184                 case -NFS4ERR_DENIED:
3185                         status = 0;
3186         }
3187         request->fl_ops->fl_release_private(request);
3188 out:
3189         return status;
3190 }
3191
3192 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3193 {
3194         struct nfs4_exception exception = { };
3195         int err;
3196
3197         do {
3198                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3199                                 _nfs4_proc_getlk(state, cmd, request),
3200                                 &exception);
3201         } while (exception.retry);
3202         return err;
3203 }
3204
3205 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3206 {
3207         int res = 0;
3208         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3209                 case FL_POSIX:
3210                         res = posix_lock_file_wait(file, fl);
3211                         break;
3212                 case FL_FLOCK:
3213                         res = flock_lock_file_wait(file, fl);
3214                         break;
3215                 default:
3216                         BUG();
3217         }
3218         return res;
3219 }
3220
3221 struct nfs4_unlockdata {
3222         struct nfs_locku_args arg;
3223         struct nfs_locku_res res;
3224         struct nfs4_lock_state *lsp;
3225         struct nfs_open_context *ctx;
3226         struct file_lock fl;
3227         const struct nfs_server *server;
3228         unsigned long timestamp;
3229 };
3230
3231 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3232                 struct nfs_open_context *ctx,
3233                 struct nfs4_lock_state *lsp,
3234                 struct nfs_seqid *seqid)
3235 {
3236         struct nfs4_unlockdata *p;
3237         struct inode *inode = lsp->ls_state->inode;
3238
3239         p = kmalloc(sizeof(*p), GFP_KERNEL);
3240         if (p == NULL)
3241                 return NULL;
3242         p->arg.fh = NFS_FH(inode);
3243         p->arg.fl = &p->fl;
3244         p->arg.seqid = seqid;
3245         p->res.seqid = seqid;
3246         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3247         p->arg.stateid = &lsp->ls_stateid;
3248         p->lsp = lsp;
3249         atomic_inc(&lsp->ls_count);
3250         /* Ensure we don't close file until we're done freeing locks! */
3251         p->ctx = get_nfs_open_context(ctx);
3252         memcpy(&p->fl, fl, sizeof(p->fl));
3253         p->server = NFS_SERVER(inode);
3254         return p;
3255 }
3256
3257 static void nfs4_locku_release_calldata(void *data)
3258 {
3259         struct nfs4_unlockdata *calldata = data;
3260         nfs_free_seqid(calldata->arg.seqid);
3261         nfs4_put_lock_state(calldata->lsp);
3262         put_nfs_open_context(calldata->ctx);
3263         kfree(calldata);
3264 }
3265
3266 static void nfs4_locku_done(struct rpc_task *task, void *data)
3267 {
3268         struct nfs4_unlockdata *calldata = data;
3269
3270         if (RPC_ASSASSINATED(task))
3271                 return;
3272         switch (task->tk_status) {
3273                 case 0:
3274                         memcpy(calldata->lsp->ls_stateid.data,
3275                                         calldata->res.stateid.data,
3276                                         sizeof(calldata->lsp->ls_stateid.data));
3277                         renew_lease(calldata->server, calldata->timestamp);
3278                         break;
3279                 case -NFS4ERR_BAD_STATEID:
3280                 case -NFS4ERR_OLD_STATEID:
3281                 case -NFS4ERR_STALE_STATEID:
3282                 case -NFS4ERR_EXPIRED:
3283                         break;
3284                 default:
3285                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3286                                 rpc_restart_call(task);
3287         }
3288 }
3289
3290 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3291 {
3292         struct nfs4_unlockdata *calldata = data;
3293
3294         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3295                 return;
3296         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3297                 /* Note: exit _without_ running nfs4_locku_done */
3298                 task->tk_action = NULL;
3299                 return;
3300         }
3301         calldata->timestamp = jiffies;
3302         rpc_call_start(task);
3303 }
3304
3305 static const struct rpc_call_ops nfs4_locku_ops = {
3306         .rpc_call_prepare = nfs4_locku_prepare,
3307         .rpc_call_done = nfs4_locku_done,
3308         .rpc_release = nfs4_locku_release_calldata,
3309 };
3310
3311 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3312                 struct nfs_open_context *ctx,
3313                 struct nfs4_lock_state *lsp,
3314                 struct nfs_seqid *seqid)
3315 {
3316         struct nfs4_unlockdata *data;
3317         struct rpc_message msg = {
3318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3319                 .rpc_cred = ctx->cred,
3320         };
3321         struct rpc_task_setup task_setup_data = {
3322                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3323                 .rpc_message = &msg,
3324                 .callback_ops = &nfs4_locku_ops,
3325                 .workqueue = nfsiod_workqueue,
3326                 .flags = RPC_TASK_ASYNC,
3327         };
3328
3329         /* Ensure this is an unlock - when canceling a lock, the
3330          * canceled lock is passed in, and it won't be an unlock.
3331          */
3332         fl->fl_type = F_UNLCK;
3333
3334         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3335         if (data == NULL) {
3336                 nfs_free_seqid(seqid);
3337                 return ERR_PTR(-ENOMEM);
3338         }
3339
3340         msg.rpc_argp = &data->arg,
3341         msg.rpc_resp = &data->res,
3342         task_setup_data.callback_data = data;
3343         return rpc_run_task(&task_setup_data);
3344 }
3345
3346 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3347 {
3348         struct nfs_inode *nfsi = NFS_I(state->inode);
3349         struct nfs_seqid *seqid;
3350         struct nfs4_lock_state *lsp;
3351         struct rpc_task *task;
3352         int status = 0;
3353         unsigned char fl_flags = request->fl_flags;
3354
3355         status = nfs4_set_lock_state(state, request);
3356         /* Unlock _before_ we do the RPC call */
3357         request->fl_flags |= FL_EXISTS;
3358         down_read(&nfsi->rwsem);
3359         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3360                 up_read(&nfsi->rwsem);
3361                 goto out;
3362         }
3363         up_read(&nfsi->rwsem);
3364         if (status != 0)
3365                 goto out;
3366         /* Is this a delegated lock? */
3367         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3368                 goto out;
3369         lsp = request->fl_u.nfs4_fl.owner;
3370         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3371         status = -ENOMEM;
3372         if (seqid == NULL)
3373                 goto out;
3374         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3375         status = PTR_ERR(task);
3376         if (IS_ERR(task))
3377                 goto out;
3378         status = nfs4_wait_for_completion_rpc_task(task);
3379         rpc_put_task(task);
3380 out:
3381         request->fl_flags = fl_flags;
3382         return status;
3383 }
3384
3385 struct nfs4_lockdata {
3386         struct nfs_lock_args arg;
3387         struct nfs_lock_res res;
3388         struct nfs4_lock_state *lsp;
3389         struct nfs_open_context *ctx;
3390         struct file_lock fl;
3391         unsigned long timestamp;
3392         int rpc_status;
3393         int cancelled;
3394 };
3395
3396 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3397                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3398 {
3399         struct nfs4_lockdata *p;
3400         struct inode *inode = lsp->ls_state->inode;
3401         struct nfs_server *server = NFS_SERVER(inode);
3402
3403         p = kzalloc(sizeof(*p), GFP_KERNEL);
3404         if (p == NULL)
3405                 return NULL;
3406
3407         p->arg.fh = NFS_FH(inode);
3408         p->arg.fl = &p->fl;
3409         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3410         if (p->arg.open_seqid == NULL)
3411                 goto out_free;
3412         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3413         if (p->arg.lock_seqid == NULL)
3414                 goto out_free_seqid;
3415         p->arg.lock_stateid = &lsp->ls_stateid;
3416         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3417         p->arg.lock_owner.id = lsp->ls_id.id;
3418         p->res.lock_seqid = p->arg.lock_seqid;
3419         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3420         p->lsp = lsp;
3421         atomic_inc(&lsp->ls_count);
3422         p->ctx = get_nfs_open_context(ctx);
3423         memcpy(&p->fl, fl, sizeof(p->fl));
3424         return p;
3425 out_free_seqid:
3426         nfs_free_seqid(p->arg.open_seqid);
3427 out_free:
3428         kfree(p);
3429         return NULL;
3430 }
3431
3432 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3433 {
3434         struct nfs4_lockdata *data = calldata;
3435         struct nfs4_state *state = data->lsp->ls_state;
3436
3437         dprintk("%s: begin!\n", __func__);
3438         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3439                 return;
3440         /* Do we need to do an open_to_lock_owner? */
3441         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3442                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3443                         return;
3444                 data->arg.open_stateid = &state->stateid;
3445                 data->arg.new_lock_owner = 1;
3446                 data->res.open_seqid = data->arg.open_seqid;
3447         } else
3448                 data->arg.new_lock_owner = 0;
3449         data->timestamp = jiffies;
3450         rpc_call_start(task);
3451         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3452 }
3453
3454 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3455 {
3456         struct nfs4_lockdata *data = calldata;
3457
3458         dprintk("%s: begin!\n", __func__);
3459
3460         data->rpc_status = task->tk_status;
3461         if (RPC_ASSASSINATED(task))
3462                 goto out;
3463         if (data->arg.new_lock_owner != 0) {
3464                 if (data->rpc_status == 0)
3465                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3466                 else
3467                         goto out;
3468         }
3469         if (data->rpc_status == 0) {
3470                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3471                                         sizeof(data->lsp->ls_stateid.data));
3472                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3473                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3474         }
3475 out:
3476         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3477 }
3478
3479 static void nfs4_lock_release(void *calldata)
3480 {
3481         struct nfs4_lockdata *data = calldata;
3482
3483         dprintk("%s: begin!\n", __func__);
3484         nfs_free_seqid(data->arg.open_seqid);
3485         if (data->cancelled != 0) {
3486                 struct rpc_task *task;
3487                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3488                                 data->arg.lock_seqid);
3489                 if (!IS_ERR(task))
3490                         rpc_put_task(task);
3491                 dprintk("%s: cancelling lock!\n", __func__);
3492         } else
3493                 nfs_free_seqid(data->arg.lock_seqid);
3494         nfs4_put_lock_state(data->lsp);
3495         put_nfs_open_context(data->ctx);
3496         kfree(data);
3497         dprintk("%s: done!\n", __func__);
3498 }
3499
3500 static const struct rpc_call_ops nfs4_lock_ops = {
3501         .rpc_call_prepare = nfs4_lock_prepare,
3502         .rpc_call_done = nfs4_lock_done,
3503         .rpc_release = nfs4_lock_release,
3504 };
3505
3506 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3507 {
3508         struct nfs4_lockdata *data;
3509         struct rpc_task *task;
3510         struct rpc_message msg = {
3511                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3512                 .rpc_cred = state->owner->so_cred,
3513         };
3514         struct rpc_task_setup task_setup_data = {
3515                 .rpc_client = NFS_CLIENT(state->inode),
3516                 .rpc_message = &msg,
3517                 .callback_ops = &nfs4_lock_ops,
3518                 .workqueue = nfsiod_workqueue,
3519                 .flags = RPC_TASK_ASYNC,
3520         };
3521         int ret;
3522
3523         dprintk("%s: begin!\n", __func__);
3524         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3525                         fl->fl_u.nfs4_fl.owner);
3526         if (data == NULL)
3527                 return -ENOMEM;
3528         if (IS_SETLKW(cmd))
3529                 data->arg.block = 1;
3530         if (reclaim != 0)
3531                 data->arg.reclaim = 1;
3532         msg.rpc_argp = &data->arg,
3533         msg.rpc_resp = &data->res,
3534         task_setup_data.callback_data = data;
3535         task = rpc_run_task(&task_setup_data);
3536         if (IS_ERR(task))
3537                 return PTR_ERR(task);
3538         ret = nfs4_wait_for_completion_rpc_task(task);
3539         if (ret == 0) {
3540                 ret = data->rpc_status;
3541                 if (ret == -NFS4ERR_DENIED)
3542                         ret = -EAGAIN;
3543         } else
3544                 data->cancelled = 1;
3545         rpc_put_task(task);
3546         dprintk("%s: done, ret = %d!\n", __func__, ret);
3547         return ret;
3548 }
3549
3550 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3551 {
3552         struct nfs_server *server = NFS_SERVER(state->inode);
3553         struct nfs4_exception exception = { };
3554         int err;
3555
3556         do {
3557                 /* Cache the lock if possible... */
3558                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3559                         return 0;
3560                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3561                 if (err != -NFS4ERR_DELAY)
3562                         break;
3563                 nfs4_handle_exception(server, err, &exception);
3564         } while (exception.retry);
3565         return err;
3566 }
3567
3568 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3569 {
3570         struct nfs_server *server = NFS_SERVER(state->inode);
3571         struct nfs4_exception exception = { };
3572         int err;
3573
3574         err = nfs4_set_lock_state(state, request);
3575         if (err != 0)
3576                 return err;
3577         do {
3578                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3579                         return 0;
3580                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3581                 if (err != -NFS4ERR_DELAY)
3582                         break;
3583                 nfs4_handle_exception(server, err, &exception);
3584         } while (exception.retry);
3585         return err;
3586 }
3587
3588 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3589 {
3590         struct nfs_inode *nfsi = NFS_I(state->inode);
3591         unsigned char fl_flags = request->fl_flags;
3592         int status;
3593
3594         /* Is this a delegated open? */
3595         status = nfs4_set_lock_state(state, request);
3596         if (status != 0)
3597                 goto out;
3598         request->fl_flags |= FL_ACCESS;
3599         status = do_vfs_lock(request->fl_file, request);
3600         if (status < 0)
3601                 goto out;
3602         down_read(&nfsi->rwsem);
3603         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3604                 /* Yes: cache locks! */
3605                 /* ...but avoid races with delegation recall... */
3606                 request->fl_flags = fl_flags & ~FL_SLEEP;
3607                 status = do_vfs_lock(request->fl_file, request);
3608                 goto out_unlock;
3609         }
3610         status = _nfs4_do_setlk(state, cmd, request, 0);
3611         if (status != 0)
3612                 goto out_unlock;
3613         /* Note: we always want to sleep here! */
3614         request->fl_flags = fl_flags | FL_SLEEP;
3615         if (do_vfs_lock(request->fl_file, request) < 0)
3616                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3617 out_unlock:
3618         up_read(&nfsi->rwsem);
3619 out:
3620         request->fl_flags = fl_flags;
3621         return status;
3622 }
3623
3624 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3625 {
3626         struct nfs4_exception exception = { };
3627         int err;
3628
3629         do {
3630                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3631                                 _nfs4_proc_setlk(state, cmd, request),
3632                                 &exception);
3633         } while (exception.retry);
3634         return err;
3635 }
3636
3637 static int
3638 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3639 {
3640         struct nfs_open_context *ctx;
3641         struct nfs4_state *state;
3642         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3643         int status;
3644
3645         /* verify open state */
3646         ctx = nfs_file_open_context(filp);
3647         state = ctx->state;
3648
3649         if (request->fl_start < 0 || request->fl_end < 0)
3650                 return -EINVAL;
3651
3652         if (IS_GETLK(cmd))
3653                 return nfs4_proc_getlk(state, F_GETLK, request);
3654
3655         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3656                 return -EINVAL;
3657
3658         if (request->fl_type == F_UNLCK)
3659                 return nfs4_proc_unlck(state, cmd, request);
3660
3661         do {
3662                 status = nfs4_proc_setlk(state, cmd, request);
3663                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3664                         break;
3665                 timeout = nfs4_set_lock_task_retry(timeout);
3666                 status = -ERESTARTSYS;
3667                 if (signalled())
3668                         break;
3669         } while(status < 0);
3670         return status;
3671 }
3672
3673 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3674 {
3675         struct nfs_server *server = NFS_SERVER(state->inode);
3676         struct nfs4_exception exception = { };
3677         int err;
3678
3679         err = nfs4_set_lock_state(state, fl);
3680         if (err != 0)
3681                 goto out;
3682         do {
3683                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3684                 if (err != -NFS4ERR_DELAY)
3685                         break;
3686                 err = nfs4_handle_exception(server, err, &exception);
3687         } while (exception.retry);
3688 out:
3689         return err;
3690 }
3691
3692 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3693
3694 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3695                 size_t buflen, int flags)
3696 {
3697         struct inode *inode = dentry->d_inode;
3698
3699         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3700                 return -EOPNOTSUPP;
3701
3702         return nfs4_proc_set_acl(inode, buf, buflen);
3703 }
3704
3705 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3706  * and that's what we'll do for e.g. user attributes that haven't been set.
3707  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3708  * attributes in kernel-managed attribute namespaces. */
3709 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3710                 size_t buflen)
3711 {
3712         struct inode *inode = dentry->d_inode;
3713
3714         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3715                 return -EOPNOTSUPP;
3716
3717         return nfs4_proc_get_acl(inode, buf, buflen);
3718 }
3719
3720 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3721 {
3722         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3723
3724         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3725                 return 0;
3726         if (buf && buflen < len)
3727                 return -ERANGE;
3728         if (buf)
3729                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3730         return len;
3731 }
3732
3733 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
3734 {
3735         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
3736                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
3737                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
3738                 return;
3739
3740         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3741                 NFS_ATTR_FATTR_NLINK;
3742         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3743         fattr->nlink = 2;
3744 }
3745
3746 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3747                 struct nfs4_fs_locations *fs_locations, struct page *page)
3748 {
3749         struct nfs_server *server = NFS_SERVER(dir);
3750         u32 bitmask[2] = {
3751                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3752                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3753         };
3754         struct nfs4_fs_locations_arg args = {
3755                 .dir_fh = NFS_FH(dir),
3756                 .name = name,
3757                 .page = page,
3758                 .bitmask = bitmask,
3759         };
3760         struct nfs4_fs_locations_res res = {
3761                 .fs_locations = fs_locations,
3762         };
3763         struct rpc_message msg = {
3764                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3765                 .rpc_argp = &args,
3766                 .rpc_resp = &res,
3767         };
3768         int status;
3769
3770         dprintk("%s: start\n", __func__);
3771         nfs_fattr_init(&fs_locations->fattr);
3772         fs_locations->server = server;
3773         fs_locations->nlocations = 0;
3774         status = nfs4_call_sync(server, &msg, &args, &res, 0);
3775         nfs_fixup_referral_attributes(&fs_locations->fattr);
3776         dprintk("%s: returned status = %d\n", __func__, status);
3777         return status;
3778 }
3779
3780 #ifdef CONFIG_NFS_V4_1
3781 /* Destroy the slot table */
3782 static void nfs4_destroy_slot_table(struct nfs4_session *session)
3783 {
3784         if (session->fc_slot_table.slots == NULL)
3785                 return;
3786         kfree(session->fc_slot_table.slots);
3787         session->fc_slot_table.slots = NULL;
3788         return;
3789 }
3790
3791 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
3792 {
3793         struct nfs4_session *session;
3794         struct nfs4_slot_table *tbl;
3795
3796         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
3797         if (!session)
3798                 return NULL;
3799         tbl = &session->fc_slot_table;
3800         spin_lock_init(&tbl->slot_tbl_lock);
3801         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "Slot table");
3802         session->clp = clp;
3803         return session;
3804 }
3805
3806 void nfs4_destroy_session(struct nfs4_session *session)
3807 {
3808         nfs4_destroy_slot_table(session);
3809         kfree(session);
3810 }
3811
3812 #endif /* CONFIG_NFS_V4_1 */
3813
3814 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3815         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
3816         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
3817         .recover_open   = nfs4_open_reclaim,
3818         .recover_lock   = nfs4_lock_reclaim,
3819 };
3820
3821 struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
3822         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
3823         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
3824         .recover_open   = nfs4_open_expired,
3825         .recover_lock   = nfs4_lock_expired,
3826 };
3827
3828 static const struct inode_operations nfs4_file_inode_operations = {
3829         .permission     = nfs_permission,
3830         .getattr        = nfs_getattr,
3831         .setattr        = nfs_setattr,
3832         .getxattr       = nfs4_getxattr,
3833         .setxattr       = nfs4_setxattr,
3834         .listxattr      = nfs4_listxattr,
3835 };
3836
3837 const struct nfs_rpc_ops nfs_v4_clientops = {
3838         .version        = 4,                    /* protocol version */
3839         .dentry_ops     = &nfs4_dentry_operations,
3840         .dir_inode_ops  = &nfs4_dir_inode_operations,
3841         .file_inode_ops = &nfs4_file_inode_operations,
3842         .getroot        = nfs4_proc_get_root,
3843         .getattr        = nfs4_proc_getattr,
3844         .setattr        = nfs4_proc_setattr,
3845         .lookupfh       = nfs4_proc_lookupfh,
3846         .lookup         = nfs4_proc_lookup,
3847         .access         = nfs4_proc_access,
3848         .readlink       = nfs4_proc_readlink,
3849         .create         = nfs4_proc_create,
3850         .remove         = nfs4_proc_remove,
3851         .unlink_setup   = nfs4_proc_unlink_setup,
3852         .unlink_done    = nfs4_proc_unlink_done,
3853         .rename         = nfs4_proc_rename,
3854         .link           = nfs4_proc_link,
3855         .symlink        = nfs4_proc_symlink,
3856         .mkdir          = nfs4_proc_mkdir,
3857         .rmdir          = nfs4_proc_remove,
3858         .readdir        = nfs4_proc_readdir,
3859         .mknod          = nfs4_proc_mknod,
3860         .statfs         = nfs4_proc_statfs,
3861         .fsinfo         = nfs4_proc_fsinfo,
3862         .pathconf       = nfs4_proc_pathconf,
3863         .set_capabilities = nfs4_server_capabilities,
3864         .decode_dirent  = nfs4_decode_dirent,
3865         .read_setup     = nfs4_proc_read_setup,
3866         .read_done      = nfs4_read_done,
3867         .write_setup    = nfs4_proc_write_setup,
3868         .write_done     = nfs4_write_done,
3869         .commit_setup   = nfs4_proc_commit_setup,
3870         .commit_done    = nfs4_commit_done,
3871         .lock           = nfs4_proc_lock,
3872         .clear_acl_cache = nfs4_zap_acl_attr,
3873         .close_context  = nfs4_close_context,
3874 };
3875
3876 /*
3877  * Local variables:
3878  *  c-basic-offset: 8
3879  * End:
3880  */