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   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 "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 198 {
 199         struct nfs_client *clp = server->nfs_client;
 200         spin_lock(&clp->cl_lock);
 201         if (time_before(clp->cl_last_renewal,timestamp))
 202                 clp->cl_last_renewal = timestamp;
 203         spin_unlock(&clp->cl_lock);
 204 }
 205
 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 207 {
 208         struct nfs_inode *nfsi = NFS_I(dir);
 209
 210         spin_lock(&dir->i_lock);
 211         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 212         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 213                 nfsi->cache_change_attribute = jiffies;
 214         nfsi->change_attr = cinfo->after;
 215         spin_unlock(&dir->i_lock);
 216 }
 217
 218 struct nfs4_opendata {
 219         struct kref kref;
 220         struct nfs_openargs o_arg;
 221         struct nfs_openres o_res;
 222         struct nfs_open_confirmargs c_arg;
 223         struct nfs_open_confirmres c_res;
 224         struct nfs_fattr f_attr;
 225         struct nfs_fattr dir_attr;
 226         struct path path;
 227         struct dentry *dir;
 228         struct nfs4_state_owner *owner;
 229         struct nfs4_state *state;
 230         struct iattr attrs;
 231         unsigned long timestamp;
 232         unsigned int rpc_done : 1;
 233         int rpc_status;
 234         int cancelled;
 235 };
 236
 237
 238 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 239 {
 240         p->o_res.f_attr = &p->f_attr;
 241         p->o_res.dir_attr = &p->dir_attr;
 242         p->o_res.server = p->o_arg.server;
 243         nfs_fattr_init(&p->f_attr);
 244         nfs_fattr_init(&p->dir_attr);
 245 }
 246
 247 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 248                 struct nfs4_state_owner *sp, int flags,
 249                 const struct iattr *attrs)
 250 {
 251         struct dentry *parent = dget_parent(path->dentry);
 252         struct inode *dir = parent->d_inode;
 253         struct nfs_server *server = NFS_SERVER(dir);
 254         struct nfs4_opendata *p;
 255
 256         p = kzalloc(sizeof(*p), GFP_KERNEL);
 257         if (p == NULL)
 258                 goto err;
 259         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 260         if (p->o_arg.seqid == NULL)
 261                 goto err_free;
 262         p->path.mnt = mntget(path->mnt);
 263         p->path.dentry = dget(path->dentry);
 264         p->dir = parent;
 265         p->owner = sp;
 266         atomic_inc(&sp->so_count);
 267         p->o_arg.fh = NFS_FH(dir);
 268         p->o_arg.open_flags = flags,
 269         p->o_arg.clientid = server->nfs_client->cl_clientid;
 270         p->o_arg.id = sp->so_owner_id.id;
 271         p->o_arg.name = &p->path.dentry->d_name;
 272         p->o_arg.server = server;
 273         p->o_arg.bitmask = server->attr_bitmask;
 274         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 275         if (flags & O_EXCL) {
 276                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 277                 s[0] = jiffies;
 278                 s[1] = current->pid;
 279         } else if (flags & O_CREAT) {
 280                 p->o_arg.u.attrs = &p->attrs;
 281                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 282         }
 283         p->c_arg.fh = &p->o_res.fh;
 284         p->c_arg.stateid = &p->o_res.stateid;
 285         p->c_arg.seqid = p->o_arg.seqid;
 286         nfs4_init_opendata_res(p);
 287         kref_init(&p->kref);
 288         return p;
 289 err_free:
 290         kfree(p);
 291 err:
 292         dput(parent);
 293         return NULL;
 294 }
 295
 296 static void nfs4_opendata_free(struct kref *kref)
 297 {
 298         struct nfs4_opendata *p = container_of(kref,
 299                         struct nfs4_opendata, kref);
 300
 301         nfs_free_seqid(p->o_arg.seqid);
 302         if (p->state != NULL)
 303                 nfs4_put_open_state(p->state);
 304         nfs4_put_state_owner(p->owner);
 305         dput(p->dir);
 306         dput(p->path.dentry);
 307         mntput(p->path.mnt);
 308         kfree(p);
 309 }
 310
 311 static void nfs4_opendata_put(struct nfs4_opendata *p)
 312 {
 313         if (p != NULL)
 314                 kref_put(&p->kref, nfs4_opendata_free);
 315 }
 316
 317 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 318 {
 319         sigset_t oldset;
 320         int ret;
 321
 322         rpc_clnt_sigmask(task->tk_client, &oldset);
 323         ret = rpc_wait_for_completion_task(task);
 324         rpc_clnt_sigunmask(task->tk_client, &oldset);
 325         return ret;
 326 }
 327
 328 static int can_open_cached(struct nfs4_state *state, int mode)
 329 {
 330         int ret = 0;
 331         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 332                 case FMODE_READ:
 333                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 334                         break;
 335                 case FMODE_WRITE:
 336                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 337                         break;
 338                 case FMODE_READ|FMODE_WRITE:
 339                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 340         }
 341         return ret;
 342 }
 343
 344 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 345 {
 346         if ((delegation->type & open_flags) != open_flags)
 347                 return 0;
 348         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 349                 return 0;
 350         return 1;
 351 }
 352
 353 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 354 {
 355         switch (open_flags) {
 356                 case FMODE_WRITE:
 357                         state->n_wronly++;
 358                         break;
 359                 case FMODE_READ:
 360                         state->n_rdonly++;
 361                         break;
 362                 case FMODE_READ|FMODE_WRITE:
 363                         state->n_rdwr++;
 364         }
 365         nfs4_state_set_mode_locked(state, state->state | open_flags);
 366 }
 367
 368 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 369 {
 370         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 371                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 372         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 373         switch (open_flags) {
 374                 case FMODE_READ:
 375                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 376                         break;
 377                 case FMODE_WRITE:
 378                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 379                         break;
 380                 case FMODE_READ|FMODE_WRITE:
 381                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 382         }
 383 }
 384
 385 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 386 {
 387         write_seqlock(&state->seqlock);
 388         nfs_set_open_stateid_locked(state, stateid, open_flags);
 389         write_sequnlock(&state->seqlock);
 390 }
 391
 392 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 393 {
 394         open_flags &= (FMODE_READ|FMODE_WRITE);
 395         /*
 396          * Protect the call to nfs4_state_set_mode_locked and
 397          * serialise the stateid update
 398          */
 399         write_seqlock(&state->seqlock);
 400         if (deleg_stateid != NULL) {
 401                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 402                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 403         }
 404         if (open_stateid != NULL)
 405                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 406         write_sequnlock(&state->seqlock);
 407         spin_lock(&state->owner->so_lock);
 408         update_open_stateflags(state, open_flags);
 409         spin_unlock(&state->owner->so_lock);
 410 }
 411
 412 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 413 {
 414         struct nfs_delegation *delegation;
 415
 416         rcu_read_lock();
 417         delegation = rcu_dereference(NFS_I(inode)->delegation);
 418         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 419                 rcu_read_unlock();
 420                 return;
 421         }
 422         rcu_read_unlock();
 423         nfs_inode_return_delegation(inode);
 424 }
 425
 426 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 427 {
 428         struct nfs4_state *state = opendata->state;
 429         struct nfs_inode *nfsi = NFS_I(state->inode);
 430         struct nfs_delegation *delegation;
 431         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 432         nfs4_stateid stateid;
 433         int ret = -EAGAIN;
 434
 435         rcu_read_lock();
 436         delegation = rcu_dereference(nfsi->delegation);
 437         for (;;) {
 438                 if (can_open_cached(state, open_mode)) {
 439                         spin_lock(&state->owner->so_lock);
 440                         if (can_open_cached(state, open_mode)) {
 441                                 update_open_stateflags(state, open_mode);
 442                                 spin_unlock(&state->owner->so_lock);
 443                                 rcu_read_unlock();
 444                                 goto out_return_state;
 445                         }
 446                         spin_unlock(&state->owner->so_lock);
 447                 }
 448                 if (delegation == NULL)
 449                         break;
 450                 if (!can_open_delegated(delegation, open_mode))
 451                         break;
 452                 /* Save the delegation */
 453                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 454                 rcu_read_unlock();
 455                 lock_kernel();
 456                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 457                 unlock_kernel();
 458                 if (ret != 0)
 459                         goto out;
 460                 ret = -EAGAIN;
 461                 rcu_read_lock();
 462                 delegation = rcu_dereference(nfsi->delegation);
 463                 /* If no delegation, try a cached open */
 464                 if (delegation == NULL)
 465                         continue;
 466                 /* Is the delegation still valid? */
 467                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 468                         continue;
 469                 rcu_read_unlock();
 470                 update_open_stateid(state, NULL, &stateid, open_mode);
 471                 goto out_return_state;
 472         }
 473         rcu_read_unlock();
 474 out:
 475         return ERR_PTR(ret);
 476 out_return_state:
 477         atomic_inc(&state->count);
 478         return state;
 479 }
 480
 481 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 482 {
 483         struct inode *inode;
 484         struct nfs4_state *state = NULL;
 485         struct nfs_delegation *delegation;
 486         nfs4_stateid *deleg_stateid = NULL;
 487         int ret;
 488
 489         if (!data->rpc_done) {
 490                 state = nfs4_try_open_cached(data);
 491                 goto out;
 492         }
 493
 494         ret = -EAGAIN;
 495         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 496                 goto err;
 497         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 498         ret = PTR_ERR(inode);
 499         if (IS_ERR(inode))
 500                 goto err;
 501         ret = -ENOMEM;
 502         state = nfs4_get_open_state(inode, data->owner);
 503         if (state == NULL)
 504                 goto err_put_inode;
 505         if (data->o_res.delegation_type != 0) {
 506                 int delegation_flags = 0;
 507
 508                 rcu_read_lock();
 509                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 510                 if (delegation)
 511                         delegation_flags = delegation->flags;
 512                 rcu_read_unlock();
 513                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 514                         nfs_inode_set_delegation(state->inode,
 515                                         data->owner->so_cred,
 516                                         &data->o_res);
 517                 else
 518                         nfs_inode_reclaim_delegation(state->inode,
 519                                         data->owner->so_cred,
 520                                         &data->o_res);
 521         }
 522         rcu_read_lock();
 523         delegation = rcu_dereference(NFS_I(inode)->delegation);
 524         if (delegation != NULL)
 525                 deleg_stateid = &delegation->stateid;
 526         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 527         rcu_read_unlock();
 528         iput(inode);
 529 out:
 530         return state;
 531 err_put_inode:
 532         iput(inode);
 533 err:
 534         return ERR_PTR(ret);
 535 }
 536
 537 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 538 {
 539         struct nfs_inode *nfsi = NFS_I(state->inode);
 540         struct nfs_open_context *ctx;
 541
 542         spin_lock(&state->inode->i_lock);
 543         list_for_each_entry(ctx, &nfsi->open_files, list) {
 544                 if (ctx->state != state)
 545                         continue;
 546                 get_nfs_open_context(ctx);
 547                 spin_unlock(&state->inode->i_lock);
 548                 return ctx;
 549         }
 550         spin_unlock(&state->inode->i_lock);
 551         return ERR_PTR(-ENOENT);
 552 }
 553
 554 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 555 {
 556         struct nfs4_opendata *opendata;
 557
 558         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 559         if (opendata == NULL)
 560                 return ERR_PTR(-ENOMEM);
 561         opendata->state = state;
 562         atomic_inc(&state->count);
 563         return opendata;
 564 }
 565
 566 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 567 {
 568         struct nfs4_state *newstate;
 569         int ret;
 570
 571         opendata->o_arg.open_flags = openflags;
 572         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 573         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 574         nfs4_init_opendata_res(opendata);
 575         ret = _nfs4_proc_open(opendata);
 576         if (ret != 0)
 577                 return ret;
 578         newstate = nfs4_opendata_to_nfs4_state(opendata);
 579         if (IS_ERR(newstate))
 580                 return PTR_ERR(newstate);
 581         nfs4_close_state(&opendata->path, newstate, openflags);
 582         *res = newstate;
 583         return 0;
 584 }
 585
 586 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 587 {
 588         struct nfs4_state *newstate;
 589         int ret;
 590
 591         /* memory barrier prior to reading state->n_* */
 592         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 593         smp_rmb();
 594         if (state->n_rdwr != 0) {
 595                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 596                 if (ret != 0)
 597                         return ret;
 598                 if (newstate != state)
 599                         return -ESTALE;
 600         }
 601         if (state->n_wronly != 0) {
 602                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 603                 if (ret != 0)
 604                         return ret;
 605                 if (newstate != state)
 606                         return -ESTALE;
 607         }
 608         if (state->n_rdonly != 0) {
 609                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 610                 if (ret != 0)
 611                         return ret;
 612                 if (newstate != state)
 613                         return -ESTALE;
 614         }
 615         /*
 616          * We may have performed cached opens for all three recoveries.
 617          * Check if we need to update the current stateid.
 618          */
 619         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 620             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 621                 write_seqlock(&state->seqlock);
 622                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 623                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 624                 write_sequnlock(&state->seqlock);
 625         }
 626         return 0;
 627 }
 628
 629 /*
 630  * OPEN_RECLAIM:
 631  *      reclaim state on the server after a reboot.
 632  */
 633 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 634 {
 635         struct nfs_delegation *delegation;
 636         struct nfs4_opendata *opendata;
 637         int delegation_type = 0;
 638         int status;
 639
 640         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 641         if (IS_ERR(opendata))
 642                 return PTR_ERR(opendata);
 643         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 644         opendata->o_arg.fh = NFS_FH(state->inode);
 645         rcu_read_lock();
 646         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 647         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 648                 delegation_type = delegation->type;
 649         rcu_read_unlock();
 650         opendata->o_arg.u.delegation_type = delegation_type;
 651         status = nfs4_open_recover(opendata, state);
 652         nfs4_opendata_put(opendata);
 653         return status;
 654 }
 655
 656 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 657 {
 658         struct nfs_server *server = NFS_SERVER(state->inode);
 659         struct nfs4_exception exception = { };
 660         int err;
 661         do {
 662                 err = _nfs4_do_open_reclaim(ctx, state);
 663                 if (err != -NFS4ERR_DELAY)
 664                         break;
 665                 nfs4_handle_exception(server, err, &exception);
 666         } while (exception.retry);
 667         return err;
 668 }
 669
 670 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 671 {
 672         struct nfs_open_context *ctx;
 673         int ret;
 674
 675         ctx = nfs4_state_find_open_context(state);
 676         if (IS_ERR(ctx))
 677                 return PTR_ERR(ctx);
 678         ret = nfs4_do_open_reclaim(ctx, state);
 679         put_nfs_open_context(ctx);
 680         return ret;
 681 }
 682
 683 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 684 {
 685         struct nfs4_opendata *opendata;
 686         int ret;
 687
 688         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 689         if (IS_ERR(opendata))
 690                 return PTR_ERR(opendata);
 691         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 692         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 693                         sizeof(opendata->o_arg.u.delegation.data));
 694         ret = nfs4_open_recover(opendata, state);
 695         nfs4_opendata_put(opendata);
 696         return ret;
 697 }
 698
 699 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 700 {
 701         struct nfs4_exception exception = { };
 702         struct nfs_server *server = NFS_SERVER(state->inode);
 703         int err;
 704         do {
 705                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 706                 switch (err) {
 707                         case 0:
 708                                 return err;
 709                         case -NFS4ERR_STALE_CLIENTID:
 710                         case -NFS4ERR_STALE_STATEID:
 711                         case -NFS4ERR_EXPIRED:
 712                                 /* Don't recall a delegation if it was lost */
 713                                 nfs4_schedule_state_recovery(server->nfs_client);
 714                                 return err;
 715                 }
 716                 err = nfs4_handle_exception(server, err, &exception);
 717         } while (exception.retry);
 718         return err;
 719 }
 720
 721 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 722 {
 723         struct nfs4_opendata *data = calldata;
 724         struct  rpc_message msg = {
 725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 726                 .rpc_argp = &data->c_arg,
 727                 .rpc_resp = &data->c_res,
 728                 .rpc_cred = data->owner->so_cred,
 729         };
 730         data->timestamp = jiffies;
 731         rpc_call_setup(task, &msg, 0);
 732 }
 733
 734 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 735 {
 736         struct nfs4_opendata *data = calldata;
 737
 738         data->rpc_status = task->tk_status;
 739         if (RPC_ASSASSINATED(task))
 740                 return;
 741         if (data->rpc_status == 0) {
 742                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 743                                 sizeof(data->o_res.stateid.data));
 744                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 745                 renew_lease(data->o_res.server, data->timestamp);
 746                 data->rpc_done = 1;
 747         }
 748         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 749 }
 750
 751 static void nfs4_open_confirm_release(void *calldata)
 752 {
 753         struct nfs4_opendata *data = calldata;
 754         struct nfs4_state *state = NULL;
 755
 756         /* If this request hasn't been cancelled, do nothing */
 757         if (data->cancelled == 0)
 758                 goto out_free;
 759         /* In case of error, no cleanup! */
 760         if (!data->rpc_done)
 761                 goto out_free;
 762         state = nfs4_opendata_to_nfs4_state(data);
 763         if (!IS_ERR(state))
 764                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 765 out_free:
 766         nfs4_opendata_put(data);
 767 }
 768
 769 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 770         .rpc_call_prepare = nfs4_open_confirm_prepare,
 771         .rpc_call_done = nfs4_open_confirm_done,
 772         .rpc_release = nfs4_open_confirm_release,
 773 };
 774
 775 /*
 776  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 777  */
 778 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 779 {
 780         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 781         struct rpc_task *task;
 782         struct rpc_task_setup task_setup_data = {
 783                 .rpc_client = server->client,
 784                 .callback_ops = &nfs4_open_confirm_ops,
 785                 .callback_data = data,
 786                 .flags = RPC_TASK_ASYNC,
 787         };
 788         int status;
 789
 790         kref_get(&data->kref);
 791         data->rpc_done = 0;
 792         data->rpc_status = 0;
 793         task = rpc_run_task(&task_setup_data);
 794         if (IS_ERR(task))
 795                 return PTR_ERR(task);
 796         status = nfs4_wait_for_completion_rpc_task(task);
 797         if (status != 0) {
 798                 data->cancelled = 1;
 799                 smp_wmb();
 800         } else
 801                 status = data->rpc_status;
 802         rpc_put_task(task);
 803         return status;
 804 }
 805
 806 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 807 {
 808         struct nfs4_opendata *data = calldata;
 809         struct nfs4_state_owner *sp = data->owner;
 810         struct rpc_message msg = {
 811                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 812                 .rpc_argp = &data->o_arg,
 813                 .rpc_resp = &data->o_res,
 814                 .rpc_cred = sp->so_cred,
 815         };
 816
 817         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 818                 return;
 819         /*
 820          * Check if we still need to send an OPEN call, or if we can use
 821          * a delegation instead.
 822          */
 823         if (data->state != NULL) {
 824                 struct nfs_delegation *delegation;
 825
 826                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 827                         goto out_no_action;
 828                 rcu_read_lock();
 829                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 830                 if (delegation != NULL &&
 831                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 832                         rcu_read_unlock();
 833                         goto out_no_action;
 834                 }
 835                 rcu_read_unlock();
 836         }
 837         /* Update sequence id. */
 838         data->o_arg.id = sp->so_owner_id.id;
 839         data->o_arg.clientid = sp->so_client->cl_clientid;
 840         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 841                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 842                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 843         }
 844         data->timestamp = jiffies;
 845         rpc_call_setup(task, &msg, 0);
 846         return;
 847 out_no_action:
 848         task->tk_action = NULL;
 849
 850 }
 851
 852 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 853 {
 854         struct nfs4_opendata *data = calldata;
 855
 856         data->rpc_status = task->tk_status;
 857         if (RPC_ASSASSINATED(task))
 858                 return;
 859         if (task->tk_status == 0) {
 860                 switch (data->o_res.f_attr->mode & S_IFMT) {
 861                         case S_IFREG:
 862                                 break;
 863                         case S_IFLNK:
 864                                 data->rpc_status = -ELOOP;
 865                                 break;
 866                         case S_IFDIR:
 867                                 data->rpc_status = -EISDIR;
 868                                 break;
 869                         default:
 870                                 data->rpc_status = -ENOTDIR;
 871                 }
 872                 renew_lease(data->o_res.server, data->timestamp);
 873                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 874                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 875         }
 876         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 877         data->rpc_done = 1;
 878 }
 879
 880 static void nfs4_open_release(void *calldata)
 881 {
 882         struct nfs4_opendata *data = calldata;
 883         struct nfs4_state *state = NULL;
 884
 885         /* If this request hasn't been cancelled, do nothing */
 886         if (data->cancelled == 0)
 887                 goto out_free;
 888         /* In case of error, no cleanup! */
 889         if (data->rpc_status != 0 || !data->rpc_done)
 890                 goto out_free;
 891         /* In case we need an open_confirm, no cleanup! */
 892         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 893                 goto out_free;
 894         state = nfs4_opendata_to_nfs4_state(data);
 895         if (!IS_ERR(state))
 896                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 897 out_free:
 898         nfs4_opendata_put(data);
 899 }
 900
 901 static const struct rpc_call_ops nfs4_open_ops = {
 902         .rpc_call_prepare = nfs4_open_prepare,
 903         .rpc_call_done = nfs4_open_done,
 904         .rpc_release = nfs4_open_release,
 905 };
 906
 907 /*
 908  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 909  */
 910 static int _nfs4_proc_open(struct nfs4_opendata *data)
 911 {
 912         struct inode *dir = data->dir->d_inode;
 913         struct nfs_server *server = NFS_SERVER(dir);
 914         struct nfs_openargs *o_arg = &data->o_arg;
 915         struct nfs_openres *o_res = &data->o_res;
 916         struct rpc_task *task;
 917         struct rpc_task_setup task_setup_data = {
 918                 .rpc_client = server->client,
 919                 .callback_ops = &nfs4_open_ops,
 920                 .callback_data = data,
 921                 .flags = RPC_TASK_ASYNC,
 922         };
 923         int status;
 924
 925         kref_get(&data->kref);
 926         data->rpc_done = 0;
 927         data->rpc_status = 0;
 928         data->cancelled = 0;
 929         task = rpc_run_task(&task_setup_data);
 930         if (IS_ERR(task))
 931                 return PTR_ERR(task);
 932         status = nfs4_wait_for_completion_rpc_task(task);
 933         if (status != 0) {
 934                 data->cancelled = 1;
 935                 smp_wmb();
 936         } else
 937                 status = data->rpc_status;
 938         rpc_put_task(task);
 939         if (status != 0 || !data->rpc_done)
 940                 return status;
 941
 942         if (o_res->fh.size == 0)
 943                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 944
 945         if (o_arg->open_flags & O_CREAT) {
 946                 update_changeattr(dir, &o_res->cinfo);
 947                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 948         } else
 949                 nfs_refresh_inode(dir, o_res->dir_attr);
 950         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 951                 status = _nfs4_proc_open_confirm(data);
 952                 if (status != 0)
 953                         return status;
 954         }
 955         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 956                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 957         return 0;
 958 }
 959
 960 static int nfs4_recover_expired_lease(struct nfs_server *server)
 961 {
 962         struct nfs_client *clp = server->nfs_client;
 963         int ret;
 964
 965         for (;;) {
 966                 ret = nfs4_wait_clnt_recover(server->client, clp);
 967                 if (ret != 0)
 968                         return ret;
 969                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 970                         break;
 971                 nfs4_schedule_state_recovery(clp);
 972         }
 973         return 0;
 974 }
 975
 976 /*
 977  * OPEN_EXPIRED:
 978  *      reclaim state on the server after a network partition.
 979  *      Assumes caller holds the appropriate lock
 980  */
 981 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 982 {
 983         struct nfs4_opendata *opendata;
 984         int ret;
 985
 986         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 987         if (IS_ERR(opendata))
 988                 return PTR_ERR(opendata);
 989         ret = nfs4_open_recover(opendata, state);
 990         if (ret == -ESTALE) {
 991                 /* Invalidate the state owner so we don't ever use it again */
 992                 nfs4_drop_state_owner(state->owner);
 993                 d_drop(ctx->path.dentry);
 994         }
 995         nfs4_opendata_put(opendata);
 996         return ret;
 997 }
 998
 999 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1000 {
1001         struct nfs_server *server = NFS_SERVER(state->inode);
1002         struct nfs4_exception exception = { };
1003         int err;
1004
1005         do {
1006                 err = _nfs4_open_expired(ctx, state);
1007                 if (err == -NFS4ERR_DELAY)
1008                         nfs4_handle_exception(server, err, &exception);
1009         } while (exception.retry);
1010         return err;
1011 }
1012
1013 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1014 {
1015         struct nfs_open_context *ctx;
1016         int ret;
1017
1018         ctx = nfs4_state_find_open_context(state);
1019         if (IS_ERR(ctx))
1020                 return PTR_ERR(ctx);
1021         ret = nfs4_do_open_expired(ctx, state);
1022         put_nfs_open_context(ctx);
1023         return ret;
1024 }
1025
1026 /*
1027  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1028  * fields corresponding to attributes that were used to store the verifier.
1029  * Make sure we clobber those fields in the later setattr call
1030  */
1031 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1032 {
1033         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1034             !(sattr->ia_valid & ATTR_ATIME_SET))
1035                 sattr->ia_valid |= ATTR_ATIME;
1036
1037         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1038             !(sattr->ia_valid & ATTR_MTIME_SET))
1039                 sattr->ia_valid |= ATTR_MTIME;
1040 }
1041
1042 /*
1043  * Returns a referenced nfs4_state
1044  */
1045 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1046 {
1047         struct nfs4_state_owner  *sp;
1048         struct nfs4_state     *state = NULL;
1049         struct nfs_server       *server = NFS_SERVER(dir);
1050         struct nfs_client *clp = server->nfs_client;
1051         struct nfs4_opendata *opendata;
1052         int status;
1053
1054         /* Protect against reboot recovery conflicts */
1055         status = -ENOMEM;
1056         if (!(sp = nfs4_get_state_owner(server, cred))) {
1057                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1058                 goto out_err;
1059         }
1060         status = nfs4_recover_expired_lease(server);
1061         if (status != 0)
1062                 goto err_put_state_owner;
1063         if (path->dentry->d_inode != NULL)
1064                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1065         down_read(&clp->cl_sem);
1066         status = -ENOMEM;
1067         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1068         if (opendata == NULL)
1069                 goto err_release_rwsem;
1070
1071         if (path->dentry->d_inode != NULL)
1072                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1073
1074         status = _nfs4_proc_open(opendata);
1075         if (status != 0)
1076                 goto err_opendata_put;
1077
1078         if (opendata->o_arg.open_flags & O_EXCL)
1079                 nfs4_exclusive_attrset(opendata, sattr);
1080
1081         state = nfs4_opendata_to_nfs4_state(opendata);
1082         status = PTR_ERR(state);
1083         if (IS_ERR(state))
1084                 goto err_opendata_put;
1085         nfs4_opendata_put(opendata);
1086         nfs4_put_state_owner(sp);
1087         up_read(&clp->cl_sem);
1088         *res = state;
1089         return 0;
1090 err_opendata_put:
1091         nfs4_opendata_put(opendata);
1092 err_release_rwsem:
1093         up_read(&clp->cl_sem);
1094 err_put_state_owner:
1095         nfs4_put_state_owner(sp);
1096 out_err:
1097         *res = NULL;
1098         return status;
1099 }
1100
1101
1102 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1103 {
1104         struct nfs4_exception exception = { };
1105         struct nfs4_state *res;
1106         int status;
1107
1108         do {
1109                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1110                 if (status == 0)
1111                         break;
1112                 /* NOTE: BAD_SEQID means the server and client disagree about the
1113                  * book-keeping w.r.t. state-changing operations
1114                  * (OPEN/CLOSE/LOCK/LOCKU...)
1115                  * It is actually a sign of a bug on the client or on the server.
1116                  *
1117                  * If we receive a BAD_SEQID error in the particular case of
1118                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1119                  * have unhashed the old state_owner for us, and that we can
1120                  * therefore safely retry using a new one. We should still warn
1121                  * the user though...
1122                  */
1123                 if (status == -NFS4ERR_BAD_SEQID) {
1124                         printk(KERN_WARNING "NFS: v4 server %s "
1125                                         " returned a bad sequence-id error!\n",
1126                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1127                         exception.retry = 1;
1128                         continue;
1129                 }
1130                 /*
1131                  * BAD_STATEID on OPEN means that the server cancelled our
1132                  * state before it received the OPEN_CONFIRM.
1133                  * Recover by retrying the request as per the discussion
1134                  * on Page 181 of RFC3530.
1135                  */
1136                 if (status == -NFS4ERR_BAD_STATEID) {
1137                         exception.retry = 1;
1138                         continue;
1139                 }
1140                 if (status == -EAGAIN) {
1141                         /* We must have found a delegation */
1142                         exception.retry = 1;
1143                         continue;
1144                 }
1145                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1146                                         status, &exception));
1147         } while (exception.retry);
1148         return res;
1149 }
1150
1151 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1152                 struct iattr *sattr, struct nfs4_state *state)
1153 {
1154         struct nfs_server *server = NFS_SERVER(inode);
1155         struct nfs_setattrargs  arg = {
1156                 .fh             = NFS_FH(inode),
1157                 .iap            = sattr,
1158                 .server         = server,
1159                 .bitmask = server->attr_bitmask,
1160         };
1161         struct nfs_setattrres  res = {
1162                 .fattr          = fattr,
1163                 .server         = server,
1164         };
1165         struct rpc_message msg = {
1166                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1167                 .rpc_argp       = &arg,
1168                 .rpc_resp       = &res,
1169         };
1170         unsigned long timestamp = jiffies;
1171         int status;
1172
1173         nfs_fattr_init(fattr);
1174
1175         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1176                 /* Use that stateid */
1177         } else if (state != NULL) {
1178                 msg.rpc_cred = state->owner->so_cred;
1179                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1180         } else
1181                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1182
1183         status = rpc_call_sync(server->client, &msg, 0);
1184         if (status == 0 && state != NULL)
1185                 renew_lease(server, timestamp);
1186         return status;
1187 }
1188
1189 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1190                 struct iattr *sattr, struct nfs4_state *state)
1191 {
1192         struct nfs_server *server = NFS_SERVER(inode);
1193         struct nfs4_exception exception = { };
1194         int err;
1195         do {
1196                 err = nfs4_handle_exception(server,
1197                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1198                                 &exception);
1199         } while (exception.retry);
1200         return err;
1201 }
1202
1203 struct nfs4_closedata {
1204         struct path path;
1205         struct inode *inode;
1206         struct nfs4_state *state;
1207         struct nfs_closeargs arg;
1208         struct nfs_closeres res;
1209         struct nfs_fattr fattr;
1210         unsigned long timestamp;
1211 };
1212
1213 static void nfs4_free_closedata(void *data)
1214 {
1215         struct nfs4_closedata *calldata = data;
1216         struct nfs4_state_owner *sp = calldata->state->owner;
1217
1218         nfs4_put_open_state(calldata->state);
1219         nfs_free_seqid(calldata->arg.seqid);
1220         nfs4_put_state_owner(sp);
1221         dput(calldata->path.dentry);
1222         mntput(calldata->path.mnt);
1223         kfree(calldata);
1224 }
1225
1226 static void nfs4_close_done(struct rpc_task *task, void *data)
1227 {
1228         struct nfs4_closedata *calldata = data;
1229         struct nfs4_state *state = calldata->state;
1230         struct nfs_server *server = NFS_SERVER(calldata->inode);
1231
1232         if (RPC_ASSASSINATED(task))
1233                 return;
1234         /* hmm. we are done with the inode, and in the process of freeing
1235          * the state_owner. we keep this around to process errors
1236          */
1237         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1238         switch (task->tk_status) {
1239                 case 0:
1240                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1241                         renew_lease(server, calldata->timestamp);
1242                         break;
1243                 case -NFS4ERR_STALE_STATEID:
1244                 case -NFS4ERR_EXPIRED:
1245                         break;
1246                 default:
1247                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1248                                 rpc_restart_call(task);
1249                                 return;
1250                         }
1251         }
1252         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1253 }
1254
1255 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1256 {
1257         struct nfs4_closedata *calldata = data;
1258         struct nfs4_state *state = calldata->state;
1259         struct rpc_message msg = {
1260                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1261                 .rpc_argp = &calldata->arg,
1262                 .rpc_resp = &calldata->res,
1263                 .rpc_cred = state->owner->so_cred,
1264         };
1265         int clear_rd, clear_wr, clear_rdwr;
1266
1267         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1268                 return;
1269
1270         clear_rd = clear_wr = clear_rdwr = 0;
1271         spin_lock(&state->owner->so_lock);
1272         /* Calculate the change in open mode */
1273         if (state->n_rdwr == 0) {
1274                 if (state->n_rdonly == 0) {
1275                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1276                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1277                 }
1278                 if (state->n_wronly == 0) {
1279                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1280                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1281                 }
1282         }
1283         spin_unlock(&state->owner->so_lock);
1284         if (!clear_rd && !clear_wr && !clear_rdwr) {
1285                 /* Note: exit _without_ calling nfs4_close_done */
1286                 task->tk_action = NULL;
1287                 return;
1288         }
1289         nfs_fattr_init(calldata->res.fattr);
1290         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1291                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1292                 calldata->arg.open_flags = FMODE_READ;
1293         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1294                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1295                 calldata->arg.open_flags = FMODE_WRITE;
1296         }
1297         calldata->timestamp = jiffies;
1298         rpc_call_setup(task, &msg, 0);
1299 }
1300
1301 static const struct rpc_call_ops nfs4_close_ops = {
1302         .rpc_call_prepare = nfs4_close_prepare,
1303         .rpc_call_done = nfs4_close_done,
1304         .rpc_release = nfs4_free_closedata,
1305 };
1306
1307 /*
1308  * It is possible for data to be read/written from a mem-mapped file
1309  * after the sys_close call (which hits the vfs layer as a flush).
1310  * This means that we can't safely call nfsv4 close on a file until
1311  * the inode is cleared. This in turn means that we are not good
1312  * NFSv4 citizens - we do not indicate to the server to update the file's
1313  * share state even when we are done with one of the three share
1314  * stateid's in the inode.
1315  *
1316  * NOTE: Caller must be holding the sp->so_owner semaphore!
1317  */
1318 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1319 {
1320         struct nfs_server *server = NFS_SERVER(state->inode);
1321         struct nfs4_closedata *calldata;
1322         struct nfs4_state_owner *sp = state->owner;
1323         struct rpc_task *task;
1324         struct rpc_task_setup task_setup_data = {
1325                 .rpc_client = server->client,
1326                 .callback_ops = &nfs4_close_ops,
1327                 .flags = RPC_TASK_ASYNC,
1328         };
1329         int status = -ENOMEM;
1330
1331         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1332         if (calldata == NULL)
1333                 goto out;
1334         calldata->inode = state->inode;
1335         calldata->state = state;
1336         calldata->arg.fh = NFS_FH(state->inode);
1337         calldata->arg.stateid = &state->open_stateid;
1338         /* Serialization for the sequence id */
1339         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1340         if (calldata->arg.seqid == NULL)
1341                 goto out_free_calldata;
1342         calldata->arg.bitmask = server->attr_bitmask;
1343         calldata->res.fattr = &calldata->fattr;
1344         calldata->res.server = server;
1345         calldata->path.mnt = mntget(path->mnt);
1346         calldata->path.dentry = dget(path->dentry);
1347
1348         task_setup_data.callback_data = calldata;
1349         task = rpc_run_task(&task_setup_data);
1350         if (IS_ERR(task))
1351                 return PTR_ERR(task);
1352         status = 0;
1353         if (wait)
1354                 status = rpc_wait_for_completion_task(task);
1355         rpc_put_task(task);
1356         return status;
1357 out_free_calldata:
1358         kfree(calldata);
1359 out:
1360         nfs4_put_open_state(state);
1361         nfs4_put_state_owner(sp);
1362         return status;
1363 }
1364
1365 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1366 {
1367         struct file *filp;
1368         int ret;
1369
1370         /* If the open_intent is for execute, we have an extra check to make */
1371         if (nd->intent.open.flags & FMODE_EXEC) {
1372                 ret = nfs_may_open(state->inode,
1373                                 state->owner->so_cred,
1374                                 nd->intent.open.flags);
1375                 if (ret < 0)
1376                         goto out_close;
1377         }
1378         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1379         if (!IS_ERR(filp)) {
1380                 struct nfs_open_context *ctx;
1381                 ctx = nfs_file_open_context(filp);
1382                 ctx->state = state;
1383                 return 0;
1384         }
1385         ret = PTR_ERR(filp);
1386 out_close:
1387         nfs4_close_sync(path, state, nd->intent.open.flags);
1388         return ret;
1389 }
1390
1391 struct dentry *
1392 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1393 {
1394         struct dentry *parent;
1395         struct path path = {
1396                 .mnt = nd->mnt,
1397                 .dentry = dentry,
1398         };
1399         struct iattr attr;
1400         struct rpc_cred *cred;
1401         struct nfs4_state *state;
1402         struct dentry *res;
1403
1404         if (nd->flags & LOOKUP_CREATE) {
1405                 attr.ia_mode = nd->intent.open.create_mode;
1406                 attr.ia_valid = ATTR_MODE;
1407                 if (!IS_POSIXACL(dir))
1408                         attr.ia_mode &= ~current->fs->umask;
1409         } else {
1410                 attr.ia_valid = 0;
1411                 BUG_ON(nd->intent.open.flags & O_CREAT);
1412         }
1413
1414         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1415         if (IS_ERR(cred))
1416                 return (struct dentry *)cred;
1417         parent = dentry->d_parent;
1418         /* Protect against concurrent sillydeletes */
1419         nfs_block_sillyrename(parent);
1420         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1421         put_rpccred(cred);
1422         if (IS_ERR(state)) {
1423                 if (PTR_ERR(state) == -ENOENT) {
1424                         d_add(dentry, NULL);
1425                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1426                 }
1427                 nfs_unblock_sillyrename(parent);
1428                 return (struct dentry *)state;
1429         }
1430         res = d_add_unique(dentry, igrab(state->inode));
1431         if (res != NULL)
1432                 path.dentry = res;
1433         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1434         nfs_unblock_sillyrename(parent);
1435         nfs4_intent_set_file(nd, &path, state);
1436         return res;
1437 }
1438
1439 int
1440 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1441 {
1442         struct path path = {
1443                 .mnt = nd->mnt,
1444                 .dentry = dentry,
1445         };
1446         struct rpc_cred *cred;
1447         struct nfs4_state *state;
1448
1449         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1450         if (IS_ERR(cred))
1451                 return PTR_ERR(cred);
1452         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1453         put_rpccred(cred);
1454         if (IS_ERR(state)) {
1455                 switch (PTR_ERR(state)) {
1456                         case -EPERM:
1457                         case -EACCES:
1458                         case -EDQUOT:
1459                         case -ENOSPC:
1460                         case -EROFS:
1461                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1462                                 return 1;
1463                         default:
1464                                 goto out_drop;
1465                 }
1466         }
1467         if (state->inode == dentry->d_inode) {
1468                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1469                 nfs4_intent_set_file(nd, &path, state);
1470                 return 1;
1471         }
1472         nfs4_close_sync(&path, state, openflags);
1473 out_drop:
1474         d_drop(dentry);
1475         return 0;
1476 }
1477
1478
1479 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1480 {
1481         struct nfs4_server_caps_res res = {};
1482         struct rpc_message msg = {
1483                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1484                 .rpc_argp = fhandle,
1485                 .rpc_resp = &res,
1486         };
1487         int status;
1488
1489         status = rpc_call_sync(server->client, &msg, 0);
1490         if (status == 0) {
1491                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1492                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1493                         server->caps |= NFS_CAP_ACLS;
1494                 if (res.has_links != 0)
1495                         server->caps |= NFS_CAP_HARDLINKS;
1496                 if (res.has_symlinks != 0)
1497                         server->caps |= NFS_CAP_SYMLINKS;
1498                 server->acl_bitmask = res.acl_bitmask;
1499         }
1500         return status;
1501 }
1502
1503 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1504 {
1505         struct nfs4_exception exception = { };
1506         int err;
1507         do {
1508                 err = nfs4_handle_exception(server,
1509                                 _nfs4_server_capabilities(server, fhandle),
1510                                 &exception);
1511         } while (exception.retry);
1512         return err;
1513 }
1514
1515 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1516                 struct nfs_fsinfo *info)
1517 {
1518         struct nfs4_lookup_root_arg args = {
1519                 .bitmask = nfs4_fattr_bitmap,
1520         };
1521         struct nfs4_lookup_res res = {
1522                 .server = server,
1523                 .fattr = info->fattr,
1524                 .fh = fhandle,
1525         };
1526         struct rpc_message msg = {
1527                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1528                 .rpc_argp = &args,
1529                 .rpc_resp = &res,
1530         };
1531         nfs_fattr_init(info->fattr);
1532         return rpc_call_sync(server->client, &msg, 0);
1533 }
1534
1535 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1536                 struct nfs_fsinfo *info)
1537 {
1538         struct nfs4_exception exception = { };
1539         int err;
1540         do {
1541                 err = nfs4_handle_exception(server,
1542                                 _nfs4_lookup_root(server, fhandle, info),
1543                                 &exception);
1544         } while (exception.retry);
1545         return err;
1546 }
1547
1548 /*
1549  * get the file handle for the "/" directory on the server
1550  */
1551 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1552                               struct nfs_fsinfo *info)
1553 {
1554         int status;
1555
1556         status = nfs4_lookup_root(server, fhandle, info);
1557         if (status == 0)
1558                 status = nfs4_server_capabilities(server, fhandle);
1559         if (status == 0)
1560                 status = nfs4_do_fsinfo(server, fhandle, info);
1561         return nfs4_map_errors(status);
1562 }
1563
1564 /*
1565  * Get locations and (maybe) other attributes of a referral.
1566  * Note that we'll actually follow the referral later when
1567  * we detect fsid mismatch in inode revalidation
1568  */
1569 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1570 {
1571         int status = -ENOMEM;
1572         struct page *page = NULL;
1573         struct nfs4_fs_locations *locations = NULL;
1574
1575         page = alloc_page(GFP_KERNEL);
1576         if (page == NULL)
1577                 goto out;
1578         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1579         if (locations == NULL)
1580                 goto out;
1581
1582         status = nfs4_proc_fs_locations(dir, name, locations, page);
1583         if (status != 0)
1584                 goto out;
1585         /* Make sure server returned a different fsid for the referral */
1586         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1587                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1588                 status = -EIO;
1589                 goto out;
1590         }
1591
1592         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1593         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1594         if (!fattr->mode)
1595                 fattr->mode = S_IFDIR;
1596         memset(fhandle, 0, sizeof(struct nfs_fh));
1597 out:
1598         if (page)
1599                 __free_page(page);
1600         if (locations)
1601                 kfree(locations);
1602         return status;
1603 }
1604
1605 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1606 {
1607         struct nfs4_getattr_arg args = {
1608                 .fh = fhandle,
1609                 .bitmask = server->attr_bitmask,
1610         };
1611         struct nfs4_getattr_res res = {
1612                 .fattr = fattr,
1613                 .server = server,
1614         };
1615         struct rpc_message msg = {
1616                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1617                 .rpc_argp = &args,
1618                 .rpc_resp = &res,
1619         };
1620
1621         nfs_fattr_init(fattr);
1622         return rpc_call_sync(server->client, &msg, 0);
1623 }
1624
1625 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1626 {
1627         struct nfs4_exception exception = { };
1628         int err;
1629         do {
1630                 err = nfs4_handle_exception(server,
1631                                 _nfs4_proc_getattr(server, fhandle, fattr),
1632                                 &exception);
1633         } while (exception.retry);
1634         return err;
1635 }
1636
1637 /*
1638  * The file is not closed if it is opened due to the a request to change
1639  * the size of the file. The open call will not be needed once the
1640  * VFS layer lookup-intents are implemented.
1641  *
1642  * Close is called when the inode is destroyed.
1643  * If we haven't opened the file for O_WRONLY, we
1644  * need to in the size_change case to obtain a stateid.
1645  *
1646  * Got race?
1647  * Because OPEN is always done by name in nfsv4, it is
1648  * possible that we opened a different file by the same
1649  * name.  We can recognize this race condition, but we
1650  * can't do anything about it besides returning an error.
1651  *
1652  * This will be fixed with VFS changes (lookup-intent).
1653  */
1654 static int
1655 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1656                   struct iattr *sattr)
1657 {
1658         struct rpc_cred *cred;
1659         struct inode *inode = dentry->d_inode;
1660         struct nfs_open_context *ctx;
1661         struct nfs4_state *state = NULL;
1662         int status;
1663
1664         nfs_fattr_init(fattr);
1665
1666         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1667         if (IS_ERR(cred))
1668                 return PTR_ERR(cred);
1669
1670         /* Search for an existing open(O_WRITE) file */
1671         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1672         if (ctx != NULL)
1673                 state = ctx->state;
1674
1675         status = nfs4_do_setattr(inode, fattr, sattr, state);
1676         if (status == 0)
1677                 nfs_setattr_update_inode(inode, sattr);
1678         if (ctx != NULL)
1679                 put_nfs_open_context(ctx);
1680         put_rpccred(cred);
1681         return status;
1682 }
1683
1684 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1685                 const struct qstr *name, struct nfs_fh *fhandle,
1686                 struct nfs_fattr *fattr)
1687 {
1688         int                    status;
1689         struct nfs4_lookup_arg args = {
1690                 .bitmask = server->attr_bitmask,
1691                 .dir_fh = dirfh,
1692                 .name = name,
1693         };
1694         struct nfs4_lookup_res res = {
1695                 .server = server,
1696                 .fattr = fattr,
1697                 .fh = fhandle,
1698         };
1699         struct rpc_message msg = {
1700                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1701                 .rpc_argp = &args,
1702                 .rpc_resp = &res,
1703         };
1704
1705         nfs_fattr_init(fattr);
1706
1707         dprintk("NFS call  lookupfh %s\n", name->name);
1708         status = rpc_call_sync(server->client, &msg, 0);
1709         dprintk("NFS reply lookupfh: %d\n", status);
1710         return status;
1711 }
1712
1713 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1714                               struct qstr *name, struct nfs_fh *fhandle,
1715                               struct nfs_fattr *fattr)
1716 {
1717         struct nfs4_exception exception = { };
1718         int err;
1719         do {
1720                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1721                 /* FIXME: !!!! */
1722                 if (err == -NFS4ERR_MOVED) {
1723                         err = -EREMOTE;
1724                         break;
1725                 }
1726                 err = nfs4_handle_exception(server, err, &exception);
1727         } while (exception.retry);
1728         return err;
1729 }
1730
1731 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1732                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1733 {
1734         int status;
1735
1736         dprintk("NFS call  lookup %s\n", name->name);
1737         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1738         if (status == -NFS4ERR_MOVED)
1739                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1740         dprintk("NFS reply lookup: %d\n", status);
1741         return status;
1742 }
1743
1744 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1745 {
1746         struct nfs4_exception exception = { };
1747         int err;
1748         do {
1749                 err = nfs4_handle_exception(NFS_SERVER(dir),
1750                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1751                                 &exception);
1752         } while (exception.retry);
1753         return err;
1754 }
1755
1756 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1757 {
1758         struct nfs_server *server = NFS_SERVER(inode);
1759         struct nfs_fattr fattr;
1760         struct nfs4_accessargs args = {
1761                 .fh = NFS_FH(inode),
1762                 .bitmask = server->attr_bitmask,
1763         };
1764         struct nfs4_accessres res = {
1765                 .server = server,
1766                 .fattr = &fattr,
1767         };
1768         struct rpc_message msg = {
1769                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1770                 .rpc_argp = &args,
1771                 .rpc_resp = &res,
1772                 .rpc_cred = entry->cred,
1773         };
1774         int mode = entry->mask;
1775         int status;
1776
1777         /*
1778          * Determine which access bits we want to ask for...
1779          */
1780         if (mode & MAY_READ)
1781                 args.access |= NFS4_ACCESS_READ;
1782         if (S_ISDIR(inode->i_mode)) {
1783                 if (mode & MAY_WRITE)
1784                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1785                 if (mode & MAY_EXEC)
1786                         args.access |= NFS4_ACCESS_LOOKUP;
1787         } else {
1788                 if (mode & MAY_WRITE)
1789                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1790                 if (mode & MAY_EXEC)
1791                         args.access |= NFS4_ACCESS_EXECUTE;
1792         }
1793         nfs_fattr_init(&fattr);
1794         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1795         if (!status) {
1796                 entry->mask = 0;
1797                 if (res.access & NFS4_ACCESS_READ)
1798                         entry->mask |= MAY_READ;
1799                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1800                         entry->mask |= MAY_WRITE;
1801                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1802                         entry->mask |= MAY_EXEC;
1803                 nfs_refresh_inode(inode, &fattr);
1804         }
1805         return status;
1806 }
1807
1808 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1809 {
1810         struct nfs4_exception exception = { };
1811         int err;
1812         do {
1813                 err = nfs4_handle_exception(NFS_SERVER(inode),
1814                                 _nfs4_proc_access(inode, entry),
1815                                 &exception);
1816         } while (exception.retry);
1817         return err;
1818 }
1819
1820 /*
1821  * TODO: For the time being, we don't try to get any attributes
1822  * along with any of the zero-copy operations READ, READDIR,
1823  * READLINK, WRITE.
1824  *
1825  * In the case of the first three, we want to put the GETATTR
1826  * after the read-type operation -- this is because it is hard
1827  * to predict the length of a GETATTR response in v4, and thus
1828  * align the READ data correctly.  This means that the GETATTR
1829  * may end up partially falling into the page cache, and we should
1830  * shift it into the 'tail' of the xdr_buf before processing.
1831  * To do this efficiently, we need to know the total length
1832  * of data received, which doesn't seem to be available outside
1833  * of the RPC layer.
1834  *
1835  * In the case of WRITE, we also want to put the GETATTR after
1836  * the operation -- in this case because we want to make sure
1837  * we get the post-operation mtime and size.  This means that
1838  * we can't use xdr_encode_pages() as written: we need a variant
1839  * of it which would leave room in the 'tail' iovec.
1840  *
1841  * Both of these changes to the XDR layer would in fact be quite
1842  * minor, but I decided to leave them for a subsequent patch.
1843  */
1844 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1845                 unsigned int pgbase, unsigned int pglen)
1846 {
1847         struct nfs4_readlink args = {
1848                 .fh       = NFS_FH(inode),
1849                 .pgbase   = pgbase,
1850                 .pglen    = pglen,
1851                 .pages    = &page,
1852         };
1853         struct rpc_message msg = {
1854                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1855                 .rpc_argp = &args,
1856                 .rpc_resp = NULL,
1857         };
1858
1859         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1860 }
1861
1862 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1863                 unsigned int pgbase, unsigned int pglen)
1864 {
1865         struct nfs4_exception exception = { };
1866         int err;
1867         do {
1868                 err = nfs4_handle_exception(NFS_SERVER(inode),
1869                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1870                                 &exception);
1871         } while (exception.retry);
1872         return err;
1873 }
1874
1875 /*
1876  * Got race?
1877  * We will need to arrange for the VFS layer to provide an atomic open.
1878  * Until then, this create/open method is prone to inefficiency and race
1879  * conditions due to the lookup, create, and open VFS calls from sys_open()
1880  * placed on the wire.
1881  *
1882  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1883  * The file will be opened again in the subsequent VFS open call
1884  * (nfs4_proc_file_open).
1885  *
1886  * The open for read will just hang around to be used by any process that
1887  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1888  */
1889
1890 static int
1891 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1892                  int flags, struct nameidata *nd)
1893 {
1894         struct path path = {
1895                 .mnt = nd->mnt,
1896                 .dentry = dentry,
1897         };
1898         struct nfs4_state *state;
1899         struct rpc_cred *cred;
1900         int status = 0;
1901
1902         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1903         if (IS_ERR(cred)) {
1904                 status = PTR_ERR(cred);
1905                 goto out;
1906         }
1907         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1908         put_rpccred(cred);
1909         d_drop(dentry);
1910         if (IS_ERR(state)) {
1911                 status = PTR_ERR(state);
1912                 goto out;
1913         }
1914         d_add(dentry, igrab(state->inode));
1915         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1916         if (flags & O_EXCL) {
1917                 struct nfs_fattr fattr;
1918                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1919                 if (status == 0)
1920                         nfs_setattr_update_inode(state->inode, sattr);
1921                 nfs_post_op_update_inode(state->inode, &fattr);
1922         }
1923         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1924                 status = nfs4_intent_set_file(nd, &path, state);
1925         else
1926                 nfs4_close_sync(&path, state, flags);
1927 out:
1928         return status;
1929 }
1930
1931 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1932 {
1933         struct nfs_server *server = NFS_SERVER(dir);
1934         struct nfs_removeargs args = {
1935                 .fh = NFS_FH(dir),
1936                 .name.len = name->len,
1937                 .name.name = name->name,
1938                 .bitmask = server->attr_bitmask,
1939         };
1940         struct nfs_removeres res = {
1941                 .server = server,
1942         };
1943         struct rpc_message msg = {
1944                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1945                 .rpc_argp = &args,
1946                 .rpc_resp = &res,
1947         };
1948         int                     status;
1949
1950         nfs_fattr_init(&res.dir_attr);
1951         status = rpc_call_sync(server->client, &msg, 0);
1952         if (status == 0) {
1953                 update_changeattr(dir, &res.cinfo);
1954                 nfs_post_op_update_inode(dir, &res.dir_attr);
1955         }
1956         return status;
1957 }
1958
1959 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1960 {
1961         struct nfs4_exception exception = { };
1962         int err;
1963         do {
1964                 err = nfs4_handle_exception(NFS_SERVER(dir),
1965                                 _nfs4_proc_remove(dir, name),
1966                                 &exception);
1967         } while (exception.retry);
1968         return err;
1969 }
1970
1971 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1972 {
1973         struct nfs_server *server = NFS_SERVER(dir);
1974         struct nfs_removeargs *args = msg->rpc_argp;
1975         struct nfs_removeres *res = msg->rpc_resp;
1976
1977         args->bitmask = server->attr_bitmask;
1978         res->server = server;
1979         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1980 }
1981
1982 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1983 {
1984         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1985
1986         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1987                 return 0;
1988         update_changeattr(dir, &res->cinfo);
1989         nfs_post_op_update_inode(dir, &res->dir_attr);
1990         return 1;
1991 }
1992
1993 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1994                 struct inode *new_dir, struct qstr *new_name)
1995 {
1996         struct nfs_server *server = NFS_SERVER(old_dir);
1997         struct nfs4_rename_arg arg = {
1998                 .old_dir = NFS_FH(old_dir),
1999                 .new_dir = NFS_FH(new_dir),
2000                 .old_name = old_name,
2001                 .new_name = new_name,
2002                 .bitmask = server->attr_bitmask,
2003         };
2004         struct nfs_fattr old_fattr, new_fattr;
2005         struct nfs4_rename_res res = {
2006                 .server = server,
2007                 .old_fattr = &old_fattr,
2008                 .new_fattr = &new_fattr,
2009         };
2010         struct rpc_message msg = {
2011                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2012                 .rpc_argp = &arg,
2013                 .rpc_resp = &res,
2014         };
2015         int                     status;
2016
2017         nfs_fattr_init(res.old_fattr);
2018         nfs_fattr_init(res.new_fattr);
2019         status = rpc_call_sync(server->client, &msg, 0);
2020
2021         if (!status) {
2022                 update_changeattr(old_dir, &res.old_cinfo);
2023                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2024                 update_changeattr(new_dir, &res.new_cinfo);
2025                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2026         }
2027         return status;
2028 }
2029
2030 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2031                 struct inode *new_dir, struct qstr *new_name)
2032 {
2033         struct nfs4_exception exception = { };
2034         int err;
2035         do {
2036                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2037                                 _nfs4_proc_rename(old_dir, old_name,
2038                                         new_dir, new_name),
2039                                 &exception);
2040         } while (exception.retry);
2041         return err;
2042 }
2043
2044 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2045 {
2046         struct nfs_server *server = NFS_SERVER(inode);
2047         struct nfs4_link_arg arg = {
2048                 .fh     = NFS_FH(inode),
2049                 .dir_fh = NFS_FH(dir),
2050                 .name   = name,
2051                 .bitmask = server->attr_bitmask,
2052         };
2053         struct nfs_fattr fattr, dir_attr;
2054         struct nfs4_link_res res = {
2055                 .server = server,
2056                 .fattr = &fattr,
2057                 .dir_attr = &dir_attr,
2058         };
2059         struct rpc_message msg = {
2060                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2061                 .rpc_argp = &arg,
2062                 .rpc_resp = &res,
2063         };
2064         int                     status;
2065
2066         nfs_fattr_init(res.fattr);
2067         nfs_fattr_init(res.dir_attr);
2068         status = rpc_call_sync(server->client, &msg, 0);
2069         if (!status) {
2070                 update_changeattr(dir, &res.cinfo);
2071                 nfs_post_op_update_inode(dir, res.dir_attr);
2072                 nfs_post_op_update_inode(inode, res.fattr);
2073         }
2074
2075         return status;
2076 }
2077
2078 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2079 {
2080         struct nfs4_exception exception = { };
2081         int err;
2082         do {
2083                 err = nfs4_handle_exception(NFS_SERVER(inode),
2084                                 _nfs4_proc_link(inode, dir, name),
2085                                 &exception);
2086         } while (exception.retry);
2087         return err;
2088 }
2089
2090 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2091                 struct page *page, unsigned int len, struct iattr *sattr)
2092 {
2093         struct nfs_server *server = NFS_SERVER(dir);
2094         struct nfs_fh fhandle;
2095         struct nfs_fattr fattr, dir_fattr;
2096         struct nfs4_create_arg arg = {
2097                 .dir_fh = NFS_FH(dir),
2098                 .server = server,
2099                 .name = &dentry->d_name,
2100                 .attrs = sattr,
2101                 .ftype = NF4LNK,
2102                 .bitmask = server->attr_bitmask,
2103         };
2104         struct nfs4_create_res res = {
2105                 .server = server,
2106                 .fh = &fhandle,
2107                 .fattr = &fattr,
2108                 .dir_fattr = &dir_fattr,
2109         };
2110         struct rpc_message msg = {
2111                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2112                 .rpc_argp = &arg,
2113                 .rpc_resp = &res,
2114         };
2115         int                     status;
2116
2117         if (len > NFS4_MAXPATHLEN)
2118                 return -ENAMETOOLONG;
2119
2120         arg.u.symlink.pages = &page;
2121         arg.u.symlink.len = len;
2122         nfs_fattr_init(&fattr);
2123         nfs_fattr_init(&dir_fattr);
2124
2125         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2126         if (!status) {
2127                 update_changeattr(dir, &res.dir_cinfo);
2128                 nfs_post_op_update_inode(dir, res.dir_fattr);
2129                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2130         }
2131         return status;
2132 }
2133
2134 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2135                 struct page *page, unsigned int len, struct iattr *sattr)
2136 {
2137         struct nfs4_exception exception = { };
2138         int err;
2139         do {
2140                 err = nfs4_handle_exception(NFS_SERVER(dir),
2141                                 _nfs4_proc_symlink(dir, dentry, page,
2142                                                         len, sattr),
2143                                 &exception);
2144         } while (exception.retry);
2145         return err;
2146 }
2147
2148 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2149                 struct iattr *sattr)
2150 {
2151         struct nfs_server *server = NFS_SERVER(dir);
2152         struct nfs_fh fhandle;
2153         struct nfs_fattr fattr, dir_fattr;
2154         struct nfs4_create_arg arg = {
2155                 .dir_fh = NFS_FH(dir),
2156                 .server = server,
2157                 .name = &dentry->d_name,
2158                 .attrs = sattr,
2159                 .ftype = NF4DIR,
2160                 .bitmask = server->attr_bitmask,
2161         };
2162         struct nfs4_create_res res = {
2163                 .server = server,
2164                 .fh = &fhandle,
2165                 .fattr = &fattr,
2166                 .dir_fattr = &dir_fattr,
2167         };
2168         struct rpc_message msg = {
2169                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2170                 .rpc_argp = &arg,
2171                 .rpc_resp = &res,
2172         };
2173         int                     status;
2174
2175         nfs_fattr_init(&fattr);
2176         nfs_fattr_init(&dir_fattr);
2177
2178         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2179         if (!status) {
2180                 update_changeattr(dir, &res.dir_cinfo);
2181                 nfs_post_op_update_inode(dir, res.dir_fattr);
2182                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2183         }
2184         return status;
2185 }
2186
2187 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2188                 struct iattr *sattr)
2189 {
2190         struct nfs4_exception exception = { };
2191         int err;
2192         do {
2193                 err = nfs4_handle_exception(NFS_SERVER(dir),
2194                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2195                                 &exception);
2196         } while (exception.retry);
2197         return err;
2198 }
2199
2200 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2201                   u64 cookie, struct page *page, unsigned int count, int plus)
2202 {
2203         struct inode            *dir = dentry->d_inode;
2204         struct nfs4_readdir_arg args = {
2205                 .fh = NFS_FH(dir),
2206                 .pages = &page,
2207                 .pgbase = 0,
2208                 .count = count,
2209                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2210         };
2211         struct nfs4_readdir_res res;
2212         struct rpc_message msg = {
2213                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2214                 .rpc_argp = &args,
2215                 .rpc_resp = &res,
2216                 .rpc_cred = cred,
2217         };
2218         int                     status;
2219
2220         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2221                         dentry->d_parent->d_name.name,
2222                         dentry->d_name.name,
2223                         (unsigned long long)cookie);
2224         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2225         res.pgbase = args.pgbase;
2226         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2227         if (status == 0)
2228                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2229
2230         nfs_invalidate_atime(dir);
2231
2232         dprintk("%s: returns %d\n", __FUNCTION__, status);
2233         return status;
2234 }
2235
2236 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2237                   u64 cookie, struct page *page, unsigned int count, int plus)
2238 {
2239         struct nfs4_exception exception = { };
2240         int err;
2241         do {
2242                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2243                                 _nfs4_proc_readdir(dentry, cred, cookie,
2244                                         page, count, plus),
2245                                 &exception);
2246         } while (exception.retry);
2247         return err;
2248 }
2249
2250 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2251                 struct iattr *sattr, dev_t rdev)
2252 {
2253         struct nfs_server *server = NFS_SERVER(dir);
2254         struct nfs_fh fh;
2255         struct nfs_fattr fattr, dir_fattr;
2256         struct nfs4_create_arg arg = {
2257                 .dir_fh = NFS_FH(dir),
2258                 .server = server,
2259                 .name = &dentry->d_name,
2260                 .attrs = sattr,
2261                 .bitmask = server->attr_bitmask,
2262         };
2263         struct nfs4_create_res res = {
2264                 .server = server,
2265                 .fh = &fh,
2266                 .fattr = &fattr,
2267                 .dir_fattr = &dir_fattr,
2268         };
2269         struct rpc_message msg = {
2270                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2271                 .rpc_argp = &arg,
2272                 .rpc_resp = &res,
2273         };
2274         int                     status;
2275         int                     mode = sattr->ia_mode;
2276
2277         nfs_fattr_init(&fattr);
2278         nfs_fattr_init(&dir_fattr);
2279
2280         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2281         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2282         if (S_ISFIFO(mode))
2283                 arg.ftype = NF4FIFO;
2284         else if (S_ISBLK(mode)) {
2285                 arg.ftype = NF4BLK;
2286                 arg.u.device.specdata1 = MAJOR(rdev);
2287                 arg.u.device.specdata2 = MINOR(rdev);
2288         }
2289         else if (S_ISCHR(mode)) {
2290                 arg.ftype = NF4CHR;
2291                 arg.u.device.specdata1 = MAJOR(rdev);
2292                 arg.u.device.specdata2 = MINOR(rdev);
2293         }
2294         else
2295                 arg.ftype = NF4SOCK;
2296
2297         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2298         if (status == 0) {
2299                 update_changeattr(dir, &res.dir_cinfo);
2300                 nfs_post_op_update_inode(dir, res.dir_fattr);
2301                 status = nfs_instantiate(dentry, &fh, &fattr);
2302         }
2303         return status;
2304 }
2305
2306 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2307                 struct iattr *sattr, dev_t rdev)
2308 {
2309         struct nfs4_exception exception = { };
2310         int err;
2311         do {
2312                 err = nfs4_handle_exception(NFS_SERVER(dir),
2313                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2314                                 &exception);
2315         } while (exception.retry);
2316         return err;
2317 }
2318
2319 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2320                  struct nfs_fsstat *fsstat)
2321 {
2322         struct nfs4_statfs_arg args = {
2323                 .fh = fhandle,
2324                 .bitmask = server->attr_bitmask,
2325         };
2326         struct rpc_message msg = {
2327                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2328                 .rpc_argp = &args,
2329                 .rpc_resp = fsstat,
2330         };
2331
2332         nfs_fattr_init(fsstat->fattr);
2333         return rpc_call_sync(server->client, &msg, 0);
2334 }
2335
2336 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2337 {
2338         struct nfs4_exception exception = { };
2339         int err;
2340         do {
2341                 err = nfs4_handle_exception(server,
2342                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2343                                 &exception);
2344         } while (exception.retry);
2345         return err;
2346 }
2347
2348 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2349                 struct nfs_fsinfo *fsinfo)
2350 {
2351         struct nfs4_fsinfo_arg args = {
2352                 .fh = fhandle,
2353                 .bitmask = server->attr_bitmask,
2354         };
2355         struct rpc_message msg = {
2356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2357                 .rpc_argp = &args,
2358                 .rpc_resp = fsinfo,
2359         };
2360
2361         return rpc_call_sync(server->client, &msg, 0);
2362 }
2363
2364 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2365 {
2366         struct nfs4_exception exception = { };
2367         int err;
2368
2369         do {
2370                 err = nfs4_handle_exception(server,
2371                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2372                                 &exception);
2373         } while (exception.retry);
2374         return err;
2375 }
2376
2377 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2378 {
2379         nfs_fattr_init(fsinfo->fattr);
2380         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2381 }
2382
2383 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2384                 struct nfs_pathconf *pathconf)
2385 {
2386         struct nfs4_pathconf_arg args = {
2387                 .fh = fhandle,
2388                 .bitmask = server->attr_bitmask,
2389         };
2390         struct rpc_message msg = {
2391                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2392                 .rpc_argp = &args,
2393                 .rpc_resp = pathconf,
2394         };
2395
2396         /* None of the pathconf attributes are mandatory to implement */
2397         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2398                 memset(pathconf, 0, sizeof(*pathconf));
2399                 return 0;
2400         }
2401
2402         nfs_fattr_init(pathconf->fattr);
2403         return rpc_call_sync(server->client, &msg, 0);
2404 }
2405
2406 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2407                 struct nfs_pathconf *pathconf)
2408 {
2409         struct nfs4_exception exception = { };
2410         int err;
2411
2412         do {
2413                 err = nfs4_handle_exception(server,
2414                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2415                                 &exception);
2416         } while (exception.retry);
2417         return err;
2418 }
2419
2420 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2421 {
2422         struct nfs_server *server = NFS_SERVER(data->inode);
2423
2424         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2425                 rpc_restart_call(task);
2426                 return -EAGAIN;
2427         }
2428
2429         nfs_invalidate_atime(data->inode);
2430         if (task->tk_status > 0)
2431                 renew_lease(server, data->timestamp);
2432         return 0;
2433 }
2434
2435 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2436 {
2437         struct rpc_message msg = {
2438                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2439                 .rpc_argp = &data->args,
2440                 .rpc_resp = &data->res,
2441                 .rpc_cred = data->cred,
2442         };
2443
2444         data->timestamp   = jiffies;
2445
2446         rpc_call_setup(&data->task, &msg, 0);
2447 }
2448
2449 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2450 {
2451         struct inode *inode = data->inode;
2452
2453         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2454                 rpc_restart_call(task);
2455                 return -EAGAIN;
2456         }
2457         if (task->tk_status >= 0) {
2458                 renew_lease(NFS_SERVER(inode), data->timestamp);
2459                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2460         }
2461         return 0;
2462 }
2463
2464 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2465 {
2466         struct rpc_message msg = {
2467                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2468                 .rpc_argp = &data->args,
2469                 .rpc_resp = &data->res,
2470                 .rpc_cred = data->cred,
2471         };
2472         struct inode *inode = data->inode;
2473         struct nfs_server *server = NFS_SERVER(inode);
2474         int stable;
2475
2476         if (how & FLUSH_STABLE) {
2477                 if (!NFS_I(inode)->ncommit)
2478                         stable = NFS_FILE_SYNC;
2479                 else
2480                         stable = NFS_DATA_SYNC;
2481         } else
2482                 stable = NFS_UNSTABLE;
2483         data->args.stable = stable;
2484         data->args.bitmask = server->attr_bitmask;
2485         data->res.server = server;
2486
2487         data->timestamp   = jiffies;
2488
2489         /* Finalize the task. */
2490         rpc_call_setup(&data->task, &msg, 0);
2491 }
2492
2493 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2494 {
2495         struct inode *inode = data->inode;
2496
2497         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2498                 rpc_restart_call(task);
2499                 return -EAGAIN;
2500         }
2501         nfs_refresh_inode(inode, data->res.fattr);
2502         return 0;
2503 }
2504
2505 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2506 {
2507         struct rpc_message msg = {
2508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2509                 .rpc_argp = &data->args,
2510                 .rpc_resp = &data->res,
2511                 .rpc_cred = data->cred,
2512         };
2513         struct nfs_server *server = NFS_SERVER(data->inode);
2514
2515         data->args.bitmask = server->attr_bitmask;
2516         data->res.server = server;
2517
2518         rpc_call_setup(&data->task, &msg, 0);
2519 }
2520
2521 /*
2522  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2523  * standalone procedure for queueing an asynchronous RENEW.
2524  */
2525 static void nfs4_renew_done(struct rpc_task *task, void *data)
2526 {
2527         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2528         unsigned long timestamp = (unsigned long)data;
2529
2530         if (task->tk_status < 0) {
2531                 switch (task->tk_status) {
2532                         case -NFS4ERR_STALE_CLIENTID:
2533                         case -NFS4ERR_EXPIRED:
2534                         case -NFS4ERR_CB_PATH_DOWN:
2535                                 nfs4_schedule_state_recovery(clp);
2536                 }
2537                 return;
2538         }
2539         spin_lock(&clp->cl_lock);
2540         if (time_before(clp->cl_last_renewal,timestamp))
2541                 clp->cl_last_renewal = timestamp;
2542         spin_unlock(&clp->cl_lock);
2543 }
2544
2545 static const struct rpc_call_ops nfs4_renew_ops = {
2546         .rpc_call_done = nfs4_renew_done,
2547 };
2548
2549 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2550 {
2551         struct rpc_message msg = {
2552                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2553                 .rpc_argp       = clp,
2554                 .rpc_cred       = cred,
2555         };
2556
2557         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2558                         &nfs4_renew_ops, (void *)jiffies);
2559 }
2560
2561 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2562 {
2563         struct rpc_message msg = {
2564                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2565                 .rpc_argp       = clp,
2566                 .rpc_cred       = cred,
2567         };
2568         unsigned long now = jiffies;
2569         int status;
2570
2571         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2572         if (status < 0)
2573                 return status;
2574         spin_lock(&clp->cl_lock);
2575         if (time_before(clp->cl_last_renewal,now))
2576                 clp->cl_last_renewal = now;
2577         spin_unlock(&clp->cl_lock);
2578         return 0;
2579 }
2580
2581 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2582 {
2583         return (server->caps & NFS_CAP_ACLS)
2584                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2585                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2586 }
2587
2588 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2589  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2590  * the stack.
2591  */
2592 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2593
2594 static void buf_to_pages(const void *buf, size_t buflen,
2595                 struct page **pages, unsigned int *pgbase)
2596 {
2597         const void *p = buf;
2598
2599         *pgbase = offset_in_page(buf);
2600         p -= *pgbase;
2601         while (p < buf + buflen) {
2602                 *(pages++) = virt_to_page(p);
2603                 p += PAGE_CACHE_SIZE;
2604         }
2605 }
2606
2607 struct nfs4_cached_acl {
2608         int cached;
2609         size_t len;
2610         char data[0];
2611 };
2612
2613 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2614 {
2615         struct nfs_inode *nfsi = NFS_I(inode);
2616
2617         spin_lock(&inode->i_lock);
2618         kfree(nfsi->nfs4_acl);
2619         nfsi->nfs4_acl = acl;
2620         spin_unlock(&inode->i_lock);
2621 }
2622
2623 static void nfs4_zap_acl_attr(struct inode *inode)
2624 {
2625         nfs4_set_cached_acl(inode, NULL);
2626 }
2627
2628 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2629 {
2630         struct nfs_inode *nfsi = NFS_I(inode);
2631         struct nfs4_cached_acl *acl;
2632         int ret = -ENOENT;
2633
2634         spin_lock(&inode->i_lock);
2635         acl = nfsi->nfs4_acl;
2636         if (acl == NULL)
2637                 goto out;
2638         if (buf == NULL) /* user is just asking for length */
2639                 goto out_len;
2640         if (acl->cached == 0)
2641                 goto out;
2642         ret = -ERANGE; /* see getxattr(2) man page */
2643         if (acl->len > buflen)
2644                 goto out;
2645         memcpy(buf, acl->data, acl->len);
2646 out_len:
2647         ret = acl->len;
2648 out:
2649         spin_unlock(&inode->i_lock);
2650         return ret;
2651 }
2652
2653 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2654 {
2655         struct nfs4_cached_acl *acl;
2656
2657         if (buf && acl_len <= PAGE_SIZE) {
2658                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2659                 if (acl == NULL)
2660                         goto out;
2661                 acl->cached = 1;
2662                 memcpy(acl->data, buf, acl_len);
2663         } else {
2664                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2665                 if (acl == NULL)
2666                         goto out;
2667                 acl->cached = 0;
2668         }
2669         acl->len = acl_len;
2670 out:
2671         nfs4_set_cached_acl(inode, acl);
2672 }
2673
2674 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2675 {
2676         struct page *pages[NFS4ACL_MAXPAGES];
2677         struct nfs_getaclargs args = {
2678                 .fh = NFS_FH(inode),
2679                 .acl_pages = pages,
2680                 .acl_len = buflen,
2681         };
2682         size_t resp_len = buflen;
2683         void *resp_buf;
2684         struct rpc_message msg = {
2685                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2686                 .rpc_argp = &args,
2687                 .rpc_resp = &resp_len,
2688         };
2689         struct page *localpage = NULL;
2690         int ret;
2691
2692         if (buflen < PAGE_SIZE) {
2693                 /* As long as we're doing a round trip to the server anyway,
2694                  * let's be prepared for a page of acl data. */
2695                 localpage = alloc_page(GFP_KERNEL);
2696                 resp_buf = page_address(localpage);
2697                 if (localpage == NULL)
2698                         return -ENOMEM;
2699                 args.acl_pages[0] = localpage;
2700                 args.acl_pgbase = 0;
2701                 resp_len = args.acl_len = PAGE_SIZE;
2702         } else {
2703                 resp_buf = buf;
2704                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2705         }
2706         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2707         if (ret)
2708                 goto out_free;
2709         if (resp_len > args.acl_len)
2710                 nfs4_write_cached_acl(inode, NULL, resp_len);
2711         else
2712                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2713         if (buf) {
2714                 ret = -ERANGE;
2715                 if (resp_len > buflen)
2716                         goto out_free;
2717                 if (localpage)
2718                         memcpy(buf, resp_buf, resp_len);
2719         }
2720         ret = resp_len;
2721 out_free:
2722         if (localpage)
2723                 __free_page(localpage);
2724         return ret;
2725 }
2726
2727 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2728 {
2729         struct nfs4_exception exception = { };
2730         ssize_t ret;
2731         do {
2732                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2733                 if (ret >= 0)
2734                         break;
2735                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2736         } while (exception.retry);
2737         return ret;
2738 }
2739
2740 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2741 {
2742         struct nfs_server *server = NFS_SERVER(inode);
2743         int ret;
2744
2745         if (!nfs4_server_supports_acls(server))
2746                 return -EOPNOTSUPP;
2747         ret = nfs_revalidate_inode(server, inode);
2748         if (ret < 0)
2749                 return ret;
2750         ret = nfs4_read_cached_acl(inode, buf, buflen);
2751         if (ret != -ENOENT)
2752                 return ret;
2753         return nfs4_get_acl_uncached(inode, buf, buflen);
2754 }
2755
2756 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2757 {
2758         struct nfs_server *server = NFS_SERVER(inode);
2759         struct page *pages[NFS4ACL_MAXPAGES];
2760         struct nfs_setaclargs arg = {
2761                 .fh             = NFS_FH(inode),
2762                 .acl_pages      = pages,
2763                 .acl_len        = buflen,
2764         };
2765         struct rpc_message msg = {
2766                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2767                 .rpc_argp       = &arg,
2768                 .rpc_resp       = NULL,
2769         };
2770         int ret;
2771
2772         if (!nfs4_server_supports_acls(server))
2773                 return -EOPNOTSUPP;
2774         nfs_inode_return_delegation(inode);
2775         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2776         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2777         nfs_zap_caches(inode);
2778         return ret;
2779 }
2780
2781 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2782 {
2783         struct nfs4_exception exception = { };
2784         int err;
2785         do {
2786                 err = nfs4_handle_exception(NFS_SERVER(inode),
2787                                 __nfs4_proc_set_acl(inode, buf, buflen),
2788                                 &exception);
2789         } while (exception.retry);
2790         return err;
2791 }
2792
2793 static int
2794 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2795 {
2796         struct nfs_client *clp = server->nfs_client;
2797
2798         if (!clp || task->tk_status >= 0)
2799                 return 0;
2800         switch(task->tk_status) {
2801                 case -NFS4ERR_STALE_CLIENTID:
2802                 case -NFS4ERR_STALE_STATEID:
2803                 case -NFS4ERR_EXPIRED:
2804                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2805                         nfs4_schedule_state_recovery(clp);
2806                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2807                                 rpc_wake_up_task(task);
2808                         task->tk_status = 0;
2809                         return -EAGAIN;
2810                 case -NFS4ERR_DELAY:
2811                         nfs_inc_server_stats((struct nfs_server *) server,
2812                                                 NFSIOS_DELAY);
2813                 case -NFS4ERR_GRACE:
2814                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2815                         task->tk_status = 0;
2816                         return -EAGAIN;
2817                 case -NFS4ERR_OLD_STATEID:
2818                         task->tk_status = 0;
2819                         return -EAGAIN;
2820         }
2821         task->tk_status = nfs4_map_errors(task->tk_status);
2822         return 0;
2823 }
2824
2825 static int nfs4_wait_bit_interruptible(void *word)
2826 {
2827         if (signal_pending(current))
2828                 return -ERESTARTSYS;
2829         schedule();
2830         return 0;
2831 }
2832
2833 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2834 {
2835         sigset_t oldset;
2836         int res;
2837
2838         might_sleep();
2839
2840         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2841
2842         rpc_clnt_sigmask(clnt, &oldset);
2843         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2844                         nfs4_wait_bit_interruptible,
2845                         TASK_INTERRUPTIBLE);
2846         rpc_clnt_sigunmask(clnt, &oldset);
2847
2848         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2849         return res;
2850 }
2851
2852 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2853 {
2854         sigset_t oldset;
2855         int res = 0;
2856
2857         might_sleep();
2858
2859         if (*timeout <= 0)
2860                 *timeout = NFS4_POLL_RETRY_MIN;
2861         if (*timeout > NFS4_POLL_RETRY_MAX)
2862                 *timeout = NFS4_POLL_RETRY_MAX;
2863         rpc_clnt_sigmask(clnt, &oldset);
2864         if (clnt->cl_intr) {
2865                 schedule_timeout_interruptible(*timeout);
2866                 if (signalled())
2867                         res = -ERESTARTSYS;
2868         } else
2869                 schedule_timeout_uninterruptible(*timeout);
2870         rpc_clnt_sigunmask(clnt, &oldset);
2871         *timeout <<= 1;
2872         return res;
2873 }
2874
2875 /* This is the error handling routine for processes that are allowed
2876  * to sleep.
2877  */
2878 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2879 {
2880         struct nfs_client *clp = server->nfs_client;
2881         int ret = errorcode;
2882
2883         exception->retry = 0;
2884         switch(errorcode) {
2885                 case 0:
2886                         return 0;
2887                 case -NFS4ERR_STALE_CLIENTID:
2888                 case -NFS4ERR_STALE_STATEID:
2889                 case -NFS4ERR_EXPIRED:
2890                         nfs4_schedule_state_recovery(clp);
2891                         ret = nfs4_wait_clnt_recover(server->client, clp);
2892                         if (ret == 0)
2893                                 exception->retry = 1;
2894                         break;
2895                 case -NFS4ERR_FILE_OPEN:
2896                 case -NFS4ERR_GRACE:
2897                 case -NFS4ERR_DELAY:
2898                         ret = nfs4_delay(server->client, &exception->timeout);
2899                         if (ret != 0)
2900                                 break;
2901                 case -NFS4ERR_OLD_STATEID:
2902                         exception->retry = 1;
2903         }
2904         /* We failed to handle the error */
2905         return nfs4_map_errors(ret);
2906 }
2907
2908 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2909 {
2910         nfs4_verifier sc_verifier;
2911         struct nfs4_setclientid setclientid = {
2912                 .sc_verifier = &sc_verifier,
2913                 .sc_prog = program,
2914         };
2915         struct rpc_message msg = {
2916                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2917                 .rpc_argp = &setclientid,
2918                 .rpc_resp = clp,
2919                 .rpc_cred = cred,
2920         };
2921         __be32 *p;
2922         int loop = 0;
2923         int status;
2924
2925         p = (__be32*)sc_verifier.data;
2926         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2927         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2928
2929         for(;;) {
2930                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2931                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2932                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2933                                 cred->cr_ops->cr_name,
2934                                 clp->cl_id_uniquifier);
2935                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2936                                 sizeof(setclientid.sc_netid), "tcp");
2937                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2938                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2939                                 clp->cl_ipaddr, port >> 8, port & 255);
2940
2941                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2942                 if (status != -NFS4ERR_CLID_INUSE)
2943                         break;
2944                 if (signalled())
2945                         break;
2946                 if (loop++ & 1)
2947                         ssleep(clp->cl_lease_time + 1);
2948                 else
2949                         if (++clp->cl_id_uniquifier == 0)
2950                                 break;
2951         }
2952         return status;
2953 }
2954
2955 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2956 {
2957         struct nfs_fsinfo fsinfo;
2958         struct rpc_message msg = {
2959                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2960                 .rpc_argp = clp,
2961                 .rpc_resp = &fsinfo,
2962                 .rpc_cred = cred,
2963         };
2964         unsigned long now;
2965         int status;
2966
2967         now = jiffies;
2968         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2969         if (status == 0) {
2970                 spin_lock(&clp->cl_lock);
2971                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2972                 clp->cl_last_renewal = now;
2973                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2974                 spin_unlock(&clp->cl_lock);
2975         }
2976         return status;
2977 }
2978
2979 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2980 {
2981         long timeout;
2982         int err;
2983         do {
2984                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2985                 switch (err) {
2986                         case 0:
2987                                 return err;
2988                         case -NFS4ERR_RESOURCE:
2989                                 /* The IBM lawyers misread another document! */
2990                         case -NFS4ERR_DELAY:
2991                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2992                 }
2993         } while (err == 0);
2994         return err;
2995 }
2996
2997 struct nfs4_delegreturndata {
2998         struct nfs4_delegreturnargs args;
2999         struct nfs4_delegreturnres res;
3000         struct nfs_fh fh;
3001         nfs4_stateid stateid;
3002         struct rpc_cred *cred;
3003         unsigned long timestamp;
3004         struct nfs_fattr fattr;
3005         int rpc_status;
3006 };
3007
3008 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
3009 {
3010         struct nfs4_delegreturndata *data = calldata;
3011         struct rpc_message msg = {
3012                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3013                 .rpc_argp = &data->args,
3014                 .rpc_resp = &data->res,
3015                 .rpc_cred = data->cred,
3016         };
3017         nfs_fattr_init(data->res.fattr);
3018         rpc_call_setup(task, &msg, 0);
3019 }
3020
3021 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3022 {
3023         struct nfs4_delegreturndata *data = calldata;
3024         data->rpc_status = task->tk_status;
3025         if (data->rpc_status == 0)
3026                 renew_lease(data->res.server, data->timestamp);
3027 }
3028
3029 static void nfs4_delegreturn_release(void *calldata)
3030 {
3031         struct nfs4_delegreturndata *data = calldata;
3032
3033         put_rpccred(data->cred);
3034         kfree(calldata);
3035 }
3036
3037 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3038         .rpc_call_prepare = nfs4_delegreturn_prepare,
3039         .rpc_call_done = nfs4_delegreturn_done,
3040         .rpc_release = nfs4_delegreturn_release,
3041 };
3042
3043 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3044 {
3045         struct nfs4_delegreturndata *data;
3046         struct nfs_server *server = NFS_SERVER(inode);
3047         struct rpc_task *task;
3048         struct rpc_task_setup task_setup_data = {
3049                 .rpc_client = server->client,
3050                 .callback_ops = &nfs4_delegreturn_ops,
3051                 .flags = RPC_TASK_ASYNC,
3052         };
3053         int status;
3054
3055         data = kmalloc(sizeof(*data), GFP_KERNEL);
3056         if (data == NULL)
3057                 return -ENOMEM;
3058         data->args.fhandle = &data->fh;
3059         data->args.stateid = &data->stateid;
3060         data->args.bitmask = server->attr_bitmask;
3061         nfs_copy_fh(&data->fh, NFS_FH(inode));
3062         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3063         data->res.fattr = &data->fattr;
3064         data->res.server = server;
3065         data->cred = get_rpccred(cred);
3066         data->timestamp = jiffies;
3067         data->rpc_status = 0;
3068
3069         task_setup_data.callback_data = data;
3070         task = rpc_run_task(&task_setup_data);
3071         if (IS_ERR(task))
3072                 return PTR_ERR(task);
3073         status = nfs4_wait_for_completion_rpc_task(task);
3074         if (status == 0) {
3075                 status = data->rpc_status;
3076                 if (status == 0)
3077                         nfs_refresh_inode(inode, &data->fattr);
3078         }
3079         rpc_put_task(task);
3080         return status;
3081 }
3082
3083 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3084 {
3085         struct nfs_server *server = NFS_SERVER(inode);
3086         struct nfs4_exception exception = { };
3087         int err;
3088         do {
3089                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3090                 switch (err) {
3091                         case -NFS4ERR_STALE_STATEID:
3092                         case -NFS4ERR_EXPIRED:
3093                         case 0:
3094                                 return 0;
3095                 }
3096                 err = nfs4_handle_exception(server, err, &exception);
3097         } while (exception.retry);
3098         return err;
3099 }
3100
3101 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3102 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3103
3104 /*
3105  * sleep, with exponential backoff, and retry the LOCK operation.
3106  */
3107 static unsigned long
3108 nfs4_set_lock_task_retry(unsigned long timeout)
3109 {
3110         schedule_timeout_interruptible(timeout);
3111         timeout <<= 1;
3112         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3113                 return NFS4_LOCK_MAXTIMEOUT;
3114         return timeout;
3115 }
3116
3117 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3118 {
3119         struct inode *inode = state->inode;
3120         struct nfs_server *server = NFS_SERVER(inode);
3121         struct nfs_client *clp = server->nfs_client;
3122         struct nfs_lockt_args arg = {
3123                 .fh = NFS_FH(inode),
3124                 .fl = request,
3125         };
3126         struct nfs_lockt_res res = {
3127                 .denied = request,
3128         };
3129         struct rpc_message msg = {
3130                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3131                 .rpc_argp       = &arg,
3132                 .rpc_resp       = &res,
3133                 .rpc_cred       = state->owner->so_cred,
3134         };
3135         struct nfs4_lock_state *lsp;
3136         int status;
3137
3138         down_read(&clp->cl_sem);
3139         arg.lock_owner.clientid = clp->cl_clientid;
3140         status = nfs4_set_lock_state(state, request);
3141         if (status != 0)
3142                 goto out;
3143         lsp = request->fl_u.nfs4_fl.owner;
3144         arg.lock_owner.id = lsp->ls_id.id;
3145         status = rpc_call_sync(server->client, &msg, 0);
3146         switch (status) {
3147                 case 0:
3148                         request->fl_type = F_UNLCK;
3149                         break;
3150                 case -NFS4ERR_DENIED:
3151                         status = 0;
3152         }
3153         request->fl_ops->fl_release_private(request);
3154 out:
3155         up_read(&clp->cl_sem);
3156         return status;
3157 }
3158
3159 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3160 {
3161         struct nfs4_exception exception = { };
3162         int err;
3163
3164         do {
3165                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3166                                 _nfs4_proc_getlk(state, cmd, request),
3167                                 &exception);
3168         } while (exception.retry);
3169         return err;
3170 }
3171
3172 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3173 {
3174         int res = 0;
3175         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3176                 case FL_POSIX:
3177                         res = posix_lock_file_wait(file, fl);
3178                         break;
3179                 case FL_FLOCK:
3180                         res = flock_lock_file_wait(file, fl);
3181                         break;
3182                 default:
3183                         BUG();
3184         }
3185         return res;
3186 }
3187
3188 struct nfs4_unlockdata {
3189         struct nfs_locku_args arg;
3190         struct nfs_locku_res res;
3191         struct nfs4_lock_state *lsp;
3192         struct nfs_open_context *ctx;
3193         struct file_lock fl;
3194         const struct nfs_server *server;
3195         unsigned long timestamp;
3196 };
3197
3198 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3199                 struct nfs_open_context *ctx,
3200                 struct nfs4_lock_state *lsp,
3201                 struct nfs_seqid *seqid)
3202 {
3203         struct nfs4_unlockdata *p;
3204         struct inode *inode = lsp->ls_state->inode;
3205
3206         p = kmalloc(sizeof(*p), GFP_KERNEL);
3207         if (p == NULL)
3208                 return NULL;
3209         p->arg.fh = NFS_FH(inode);
3210         p->arg.fl = &p->fl;
3211         p->arg.seqid = seqid;
3212         p->arg.stateid = &lsp->ls_stateid;
3213         p->lsp = lsp;
3214         atomic_inc(&lsp->ls_count);
3215         /* Ensure we don't close file until we're done freeing locks! */
3216         p->ctx = get_nfs_open_context(ctx);
3217         memcpy(&p->fl, fl, sizeof(p->fl));
3218         p->server = NFS_SERVER(inode);
3219         return p;
3220 }
3221
3222 static void nfs4_locku_release_calldata(void *data)
3223 {
3224         struct nfs4_unlockdata *calldata = data;
3225         nfs_free_seqid(calldata->arg.seqid);
3226         nfs4_put_lock_state(calldata->lsp);
3227         put_nfs_open_context(calldata->ctx);
3228         kfree(calldata);
3229 }
3230
3231 static void nfs4_locku_done(struct rpc_task *task, void *data)
3232 {
3233         struct nfs4_unlockdata *calldata = data;
3234
3235         if (RPC_ASSASSINATED(task))
3236                 return;
3237         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3238         switch (task->tk_status) {
3239                 case 0:
3240                         memcpy(calldata->lsp->ls_stateid.data,
3241                                         calldata->res.stateid.data,
3242                                         sizeof(calldata->lsp->ls_stateid.data));
3243                         renew_lease(calldata->server, calldata->timestamp);
3244                         break;
3245                 case -NFS4ERR_STALE_STATEID:
3246                 case -NFS4ERR_EXPIRED:
3247                         break;
3248                 default:
3249                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3250                                 rpc_restart_call(task);
3251         }
3252 }
3253
3254 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3255 {
3256         struct nfs4_unlockdata *calldata = data;
3257         struct rpc_message msg = {
3258                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3259                 .rpc_argp       = &calldata->arg,
3260                 .rpc_resp       = &calldata->res,
3261                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3262         };
3263
3264         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3265                 return;
3266         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3267                 /* Note: exit _without_ running nfs4_locku_done */
3268                 task->tk_action = NULL;
3269                 return;
3270         }
3271         calldata->timestamp = jiffies;
3272         rpc_call_setup(task, &msg, 0);
3273 }
3274
3275 static const struct rpc_call_ops nfs4_locku_ops = {
3276         .rpc_call_prepare = nfs4_locku_prepare,
3277         .rpc_call_done = nfs4_locku_done,
3278         .rpc_release = nfs4_locku_release_calldata,
3279 };
3280
3281 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3282                 struct nfs_open_context *ctx,
3283                 struct nfs4_lock_state *lsp,
3284                 struct nfs_seqid *seqid)
3285 {
3286         struct nfs4_unlockdata *data;
3287         struct rpc_task_setup task_setup_data = {
3288                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3289                 .callback_ops = &nfs4_locku_ops,
3290                 .flags = RPC_TASK_ASYNC,
3291         };
3292
3293         /* Ensure this is an unlock - when canceling a lock, the
3294          * canceled lock is passed in, and it won't be an unlock.
3295          */
3296         fl->fl_type = F_UNLCK;
3297
3298         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3299         if (data == NULL) {
3300                 nfs_free_seqid(seqid);
3301                 return ERR_PTR(-ENOMEM);
3302         }
3303
3304         task_setup_data.callback_data = data;
3305         return rpc_run_task(&task_setup_data);
3306 }
3307
3308 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3309 {
3310         struct nfs_seqid *seqid;
3311         struct nfs4_lock_state *lsp;
3312         struct rpc_task *task;
3313         int status = 0;
3314
3315         status = nfs4_set_lock_state(state, request);
3316         /* Unlock _before_ we do the RPC call */
3317         request->fl_flags |= FL_EXISTS;
3318         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3319                 goto out;
3320         if (status != 0)
3321                 goto out;
3322         /* Is this a delegated lock? */
3323         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3324                 goto out;
3325         lsp = request->fl_u.nfs4_fl.owner;
3326         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3327         status = -ENOMEM;
3328         if (seqid == NULL)
3329                 goto out;
3330         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3331         status = PTR_ERR(task);
3332         if (IS_ERR(task))
3333                 goto out;
3334         status = nfs4_wait_for_completion_rpc_task(task);
3335         rpc_put_task(task);
3336 out:
3337         return status;
3338 }
3339
3340 struct nfs4_lockdata {
3341         struct nfs_lock_args arg;
3342         struct nfs_lock_res res;
3343         struct nfs4_lock_state *lsp;
3344         struct nfs_open_context *ctx;
3345         struct file_lock fl;
3346         unsigned long timestamp;
3347         int rpc_status;
3348         int cancelled;
3349 };
3350
3351 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3352                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3353 {
3354         struct nfs4_lockdata *p;
3355         struct inode *inode = lsp->ls_state->inode;
3356         struct nfs_server *server = NFS_SERVER(inode);
3357
3358         p = kzalloc(sizeof(*p), GFP_KERNEL);
3359         if (p == NULL)
3360                 return NULL;
3361
3362         p->arg.fh = NFS_FH(inode);
3363         p->arg.fl = &p->fl;
3364         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3365         if (p->arg.open_seqid == NULL)
3366                 goto out_free;
3367         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3368         if (p->arg.lock_seqid == NULL)
3369                 goto out_free_seqid;
3370         p->arg.lock_stateid = &lsp->ls_stateid;
3371         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3372         p->arg.lock_owner.id = lsp->ls_id.id;
3373         p->lsp = lsp;
3374         atomic_inc(&lsp->ls_count);
3375         p->ctx = get_nfs_open_context(ctx);
3376         memcpy(&p->fl, fl, sizeof(p->fl));
3377         return p;
3378 out_free_seqid:
3379         nfs_free_seqid(p->arg.open_seqid);
3380 out_free:
3381         kfree(p);
3382         return NULL;
3383 }
3384
3385 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3386 {
3387         struct nfs4_lockdata *data = calldata;
3388         struct nfs4_state *state = data->lsp->ls_state;
3389         struct nfs4_state_owner *sp = state->owner;
3390         struct rpc_message msg = {
3391                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3392                 .rpc_argp = &data->arg,
3393                 .rpc_resp = &data->res,
3394                 .rpc_cred = sp->so_cred,
3395         };
3396
3397         dprintk("%s: begin!\n", __FUNCTION__);
3398         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3399                 return;
3400         /* Do we need to do an open_to_lock_owner? */
3401         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3402                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3403                         return;
3404                 data->arg.open_stateid = &state->stateid;
3405                 data->arg.new_lock_owner = 1;
3406         } else
3407                 data->arg.new_lock_owner = 0;
3408         data->timestamp = jiffies;
3409         rpc_call_setup(task, &msg, 0);
3410         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3411 }
3412
3413 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3414 {
3415         struct nfs4_lockdata *data = calldata;
3416
3417         dprintk("%s: begin!\n", __FUNCTION__);
3418
3419         data->rpc_status = task->tk_status;
3420         if (RPC_ASSASSINATED(task))
3421                 goto out;
3422         if (data->arg.new_lock_owner != 0) {
3423                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3424                 if (data->rpc_status == 0)
3425                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3426                 else
3427                         goto out;
3428         }
3429         if (data->rpc_status == 0) {
3430                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3431                                         sizeof(data->lsp->ls_stateid.data));
3432                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3433                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3434         }
3435         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3436 out:
3437         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3438 }
3439
3440 static void nfs4_lock_release(void *calldata)
3441 {
3442         struct nfs4_lockdata *data = calldata;
3443
3444         dprintk("%s: begin!\n", __FUNCTION__);
3445         nfs_free_seqid(data->arg.open_seqid);
3446         if (data->cancelled != 0) {
3447                 struct rpc_task *task;
3448                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3449                                 data->arg.lock_seqid);
3450                 if (!IS_ERR(task))
3451                         rpc_put_task(task);
3452                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3453         } else
3454                 nfs_free_seqid(data->arg.lock_seqid);
3455         nfs4_put_lock_state(data->lsp);
3456         put_nfs_open_context(data->ctx);
3457         kfree(data);
3458         dprintk("%s: done!\n", __FUNCTION__);
3459 }
3460
3461 static const struct rpc_call_ops nfs4_lock_ops = {
3462         .rpc_call_prepare = nfs4_lock_prepare,
3463         .rpc_call_done = nfs4_lock_done,
3464         .rpc_release = nfs4_lock_release,
3465 };
3466
3467 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3468 {
3469         struct nfs4_lockdata *data;
3470         struct rpc_task *task;
3471         struct rpc_task_setup task_setup_data = {
3472                 .rpc_client = NFS_CLIENT(state->inode),
3473                 .callback_ops = &nfs4_lock_ops,
3474                 .flags = RPC_TASK_ASYNC,
3475         };
3476         int ret;
3477
3478         dprintk("%s: begin!\n", __FUNCTION__);
3479         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3480                         fl->fl_u.nfs4_fl.owner);
3481         if (data == NULL)
3482                 return -ENOMEM;
3483         if (IS_SETLKW(cmd))
3484                 data->arg.block = 1;
3485         if (reclaim != 0)
3486                 data->arg.reclaim = 1;
3487         task_setup_data.callback_data = data;
3488         task = rpc_run_task(&task_setup_data);
3489         if (IS_ERR(task))
3490                 return PTR_ERR(task);
3491         ret = nfs4_wait_for_completion_rpc_task(task);
3492         if (ret == 0) {
3493                 ret = data->rpc_status;
3494                 if (ret == -NFS4ERR_DENIED)
3495                         ret = -EAGAIN;
3496         } else
3497                 data->cancelled = 1;
3498         rpc_put_task(task);
3499         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3500         return ret;
3501 }
3502
3503 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3504 {
3505         struct nfs_server *server = NFS_SERVER(state->inode);
3506         struct nfs4_exception exception = { };
3507         int err;
3508
3509         do {
3510                 /* Cache the lock if possible... */
3511                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3512                         return 0;
3513                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3514                 if (err != -NFS4ERR_DELAY)
3515                         break;
3516                 nfs4_handle_exception(server, err, &exception);
3517         } while (exception.retry);
3518         return err;
3519 }
3520
3521 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3522 {
3523         struct nfs_server *server = NFS_SERVER(state->inode);
3524         struct nfs4_exception exception = { };
3525         int err;
3526
3527         err = nfs4_set_lock_state(state, request);
3528         if (err != 0)
3529                 return err;
3530         do {
3531                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3532                         return 0;
3533                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3534                 if (err != -NFS4ERR_DELAY)
3535                         break;
3536                 nfs4_handle_exception(server, err, &exception);
3537         } while (exception.retry);
3538         return err;
3539 }
3540
3541 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3542 {
3543         struct nfs_client *clp = state->owner->so_client;
3544         unsigned char fl_flags = request->fl_flags;
3545         int status;
3546
3547         /* Is this a delegated open? */
3548         status = nfs4_set_lock_state(state, request);
3549         if (status != 0)
3550                 goto out;
3551         request->fl_flags |= FL_ACCESS;
3552         status = do_vfs_lock(request->fl_file, request);
3553         if (status < 0)
3554                 goto out;
3555         down_read(&clp->cl_sem);
3556         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3557                 struct nfs_inode *nfsi = NFS_I(state->inode);
3558                 /* Yes: cache locks! */
3559                 down_read(&nfsi->rwsem);
3560                 /* ...but avoid races with delegation recall... */
3561                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3562                         request->fl_flags = fl_flags & ~FL_SLEEP;
3563                         status = do_vfs_lock(request->fl_file, request);
3564                         up_read(&nfsi->rwsem);
3565                         goto out_unlock;
3566                 }
3567                 up_read(&nfsi->rwsem);
3568         }
3569         status = _nfs4_do_setlk(state, cmd, request, 0);
3570         if (status != 0)
3571                 goto out_unlock;
3572         /* Note: we always want to sleep here! */
3573         request->fl_flags = fl_flags | FL_SLEEP;
3574         if (do_vfs_lock(request->fl_file, request) < 0)
3575                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3576 out_unlock:
3577         up_read(&clp->cl_sem);
3578 out:
3579         request->fl_flags = fl_flags;
3580         return status;
3581 }
3582
3583 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3584 {
3585         struct nfs4_exception exception = { };
3586         int err;
3587
3588         do {
3589                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3590                                 _nfs4_proc_setlk(state, cmd, request),
3591                                 &exception);
3592         } while (exception.retry);
3593         return err;
3594 }
3595
3596 static int
3597 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3598 {
3599         struct nfs_open_context *ctx;
3600         struct nfs4_state *state;
3601         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3602         int status;
3603
3604         /* verify open state */
3605         ctx = nfs_file_open_context(filp);
3606         state = ctx->state;
3607
3608         if (request->fl_start < 0 || request->fl_end < 0)
3609                 return -EINVAL;
3610
3611         if (IS_GETLK(cmd))
3612                 return nfs4_proc_getlk(state, F_GETLK, request);
3613
3614         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3615                 return -EINVAL;
3616
3617         if (request->fl_type == F_UNLCK)
3618                 return nfs4_proc_unlck(state, cmd, request);
3619
3620         do {
3621                 status = nfs4_proc_setlk(state, cmd, request);
3622                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3623                         break;
3624                 timeout = nfs4_set_lock_task_retry(timeout);
3625                 status = -ERESTARTSYS;
3626                 if (signalled())
3627                         break;
3628         } while(status < 0);
3629         return status;
3630 }
3631
3632 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3633 {
3634         struct nfs_server *server = NFS_SERVER(state->inode);
3635         struct nfs4_exception exception = { };
3636         int err;
3637
3638         err = nfs4_set_lock_state(state, fl);
3639         if (err != 0)
3640                 goto out;
3641         do {
3642                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3643                 if (err != -NFS4ERR_DELAY)
3644                         break;
3645                 err = nfs4_handle_exception(server, err, &exception);
3646         } while (exception.retry);
3647 out:
3648         return err;
3649 }
3650
3651 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3652
3653 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3654                 size_t buflen, int flags)
3655 {
3656         struct inode *inode = dentry->d_inode;
3657
3658         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3659                 return -EOPNOTSUPP;
3660
3661         if (!S_ISREG(inode->i_mode) &&
3662             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3663                 return -EPERM;
3664
3665         return nfs4_proc_set_acl(inode, buf, buflen);
3666 }
3667
3668 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3669  * and that's what we'll do for e.g. user attributes that haven't been set.
3670  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3671  * attributes in kernel-managed attribute namespaces. */
3672 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3673                 size_t buflen)
3674 {
3675         struct inode *inode = dentry->d_inode;
3676
3677         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3678                 return -EOPNOTSUPP;
3679
3680         return nfs4_proc_get_acl(inode, buf, buflen);
3681 }
3682
3683 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3684 {
3685         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3686
3687         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3688                 return 0;
3689         if (buf && buflen < len)
3690                 return -ERANGE;
3691         if (buf)
3692                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3693         return len;
3694 }
3695
3696 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3697                 struct nfs4_fs_locations *fs_locations, struct page *page)
3698 {
3699         struct nfs_server *server = NFS_SERVER(dir);
3700         u32 bitmask[2] = {
3701                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3702                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3703         };
3704         struct nfs4_fs_locations_arg args = {
3705                 .dir_fh = NFS_FH(dir),
3706                 .name = name,
3707                 .page = page,
3708                 .bitmask = bitmask,
3709         };
3710         struct rpc_message msg = {
3711                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3712                 .rpc_argp = &args,
3713                 .rpc_resp = fs_locations,
3714         };
3715         int status;
3716
3717         dprintk("%s: start\n", __FUNCTION__);
3718         nfs_fattr_init(&fs_locations->fattr);
3719         fs_locations->server = server;
3720         fs_locations->nlocations = 0;
3721         status = rpc_call_sync(server->client, &msg, 0);
3722         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3723         return status;
3724 }
3725
3726 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3727         .recover_open   = nfs4_open_reclaim,
3728         .recover_lock   = nfs4_lock_reclaim,
3729 };
3730
3731 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3732         .recover_open   = nfs4_open_expired,
3733         .recover_lock   = nfs4_lock_expired,
3734 };
3735
3736 static const struct inode_operations nfs4_file_inode_operations = {
3737         .permission     = nfs_permission,
3738         .getattr        = nfs_getattr,
3739         .setattr        = nfs_setattr,
3740         .getxattr       = nfs4_getxattr,
3741         .setxattr       = nfs4_setxattr,
3742         .listxattr      = nfs4_listxattr,
3743 };
3744
3745 const struct nfs_rpc_ops nfs_v4_clientops = {
3746         .version        = 4,                    /* protocol version */
3747         .dentry_ops     = &nfs4_dentry_operations,
3748         .dir_inode_ops  = &nfs4_dir_inode_operations,
3749         .file_inode_ops = &nfs4_file_inode_operations,
3750         .getroot        = nfs4_proc_get_root,
3751         .getattr        = nfs4_proc_getattr,
3752         .setattr        = nfs4_proc_setattr,
3753         .lookupfh       = nfs4_proc_lookupfh,
3754         .lookup         = nfs4_proc_lookup,
3755         .access         = nfs4_proc_access,
3756         .readlink       = nfs4_proc_readlink,
3757         .create         = nfs4_proc_create,
3758         .remove         = nfs4_proc_remove,
3759         .unlink_setup   = nfs4_proc_unlink_setup,
3760         .unlink_done    = nfs4_proc_unlink_done,
3761         .rename         = nfs4_proc_rename,
3762         .link           = nfs4_proc_link,
3763         .symlink        = nfs4_proc_symlink,
3764         .mkdir          = nfs4_proc_mkdir,
3765         .rmdir          = nfs4_proc_remove,
3766         .readdir        = nfs4_proc_readdir,
3767         .mknod          = nfs4_proc_mknod,
3768         .statfs         = nfs4_proc_statfs,
3769         .fsinfo         = nfs4_proc_fsinfo,
3770         .pathconf       = nfs4_proc_pathconf,
3771         .set_capabilities = nfs4_server_capabilities,
3772         .decode_dirent  = nfs4_decode_dirent,
3773         .read_setup     = nfs4_proc_read_setup,
3774         .read_done      = nfs4_read_done,
3775         .write_setup    = nfs4_proc_write_setup,
3776         .write_done     = nfs4_write_done,
3777         .commit_setup   = nfs4_proc_commit_setup,
3778         .commit_done    = nfs4_commit_done,
3779         .file_open      = nfs_open,
3780         .file_release   = nfs_release,
3781         .lock           = nfs4_proc_lock,
3782         .clear_acl_cache = nfs4_zap_acl_attr,
3783 };
3784
3785 /*
3786  * Local variables:
3787  *  c-basic-offset: 8
3788  * End:
3789  */