fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "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                 renew_lease(data->o_res.server, data->timestamp);
 745                 data->rpc_done = 1;
 746         }
 747         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 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         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 763         state = nfs4_opendata_to_nfs4_state(data);
 764         if (!IS_ERR(state))
 765                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 766 out_free:
 767         nfs4_opendata_put(data);
 768 }
 769
 770 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 771         .rpc_call_prepare = nfs4_open_confirm_prepare,
 772         .rpc_call_done = nfs4_open_confirm_done,
 773         .rpc_release = nfs4_open_confirm_release,
 774 };
 775
 776 /*
 777  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 778  */
 779 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 780 {
 781         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 782         struct rpc_task *task;
 783         int status;
 784
 785         kref_get(&data->kref);
 786         data->rpc_done = 0;
 787         data->rpc_status = 0;
 788         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 789         if (IS_ERR(task))
 790                 return PTR_ERR(task);
 791         status = nfs4_wait_for_completion_rpc_task(task);
 792         if (status != 0) {
 793                 data->cancelled = 1;
 794                 smp_wmb();
 795         } else
 796                 status = data->rpc_status;
 797         rpc_put_task(task);
 798         return status;
 799 }
 800
 801 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 802 {
 803         struct nfs4_opendata *data = calldata;
 804         struct nfs4_state_owner *sp = data->owner;
 805         struct rpc_message msg = {
 806                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 807                 .rpc_argp = &data->o_arg,
 808                 .rpc_resp = &data->o_res,
 809                 .rpc_cred = sp->so_cred,
 810         };
 811
 812         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 813                 return;
 814         /*
 815          * Check if we still need to send an OPEN call, or if we can use
 816          * a delegation instead.
 817          */
 818         if (data->state != NULL) {
 819                 struct nfs_delegation *delegation;
 820
 821                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 822                         goto out_no_action;
 823                 rcu_read_lock();
 824                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 825                 if (delegation != NULL &&
 826                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 827                         rcu_read_unlock();
 828                         goto out_no_action;
 829                 }
 830                 rcu_read_unlock();
 831         }
 832         /* Update sequence id. */
 833         data->o_arg.id = sp->so_owner_id.id;
 834         data->o_arg.clientid = sp->so_client->cl_clientid;
 835         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 836                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 837                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 838         }
 839         data->timestamp = jiffies;
 840         rpc_call_setup(task, &msg, 0);
 841         return;
 842 out_no_action:
 843         task->tk_action = NULL;
 844
 845 }
 846
 847 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 848 {
 849         struct nfs4_opendata *data = calldata;
 850
 851         data->rpc_status = task->tk_status;
 852         if (RPC_ASSASSINATED(task))
 853                 return;
 854         if (task->tk_status == 0) {
 855                 switch (data->o_res.f_attr->mode & S_IFMT) {
 856                         case S_IFREG:
 857                                 break;
 858                         case S_IFLNK:
 859                                 data->rpc_status = -ELOOP;
 860                                 break;
 861                         case S_IFDIR:
 862                                 data->rpc_status = -EISDIR;
 863                                 break;
 864                         default:
 865                                 data->rpc_status = -ENOTDIR;
 866                 }
 867                 renew_lease(data->o_res.server, data->timestamp);
 868                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 869                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 870         }
 871         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 872         data->rpc_done = 1;
 873 }
 874
 875 static void nfs4_open_release(void *calldata)
 876 {
 877         struct nfs4_opendata *data = calldata;
 878         struct nfs4_state *state = NULL;
 879
 880         /* If this request hasn't been cancelled, do nothing */
 881         if (data->cancelled == 0)
 882                 goto out_free;
 883         /* In case of error, no cleanup! */
 884         if (data->rpc_status != 0 || !data->rpc_done)
 885                 goto out_free;
 886         /* In case we need an open_confirm, no cleanup! */
 887         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 888                 goto out_free;
 889         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 890         state = nfs4_opendata_to_nfs4_state(data);
 891         if (!IS_ERR(state))
 892                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 893 out_free:
 894         nfs4_opendata_put(data);
 895 }
 896
 897 static const struct rpc_call_ops nfs4_open_ops = {
 898         .rpc_call_prepare = nfs4_open_prepare,
 899         .rpc_call_done = nfs4_open_done,
 900         .rpc_release = nfs4_open_release,
 901 };
 902
 903 /*
 904  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 905  */
 906 static int _nfs4_proc_open(struct nfs4_opendata *data)
 907 {
 908         struct inode *dir = data->dir->d_inode;
 909         struct nfs_server *server = NFS_SERVER(dir);
 910         struct nfs_openargs *o_arg = &data->o_arg;
 911         struct nfs_openres *o_res = &data->o_res;
 912         struct rpc_task *task;
 913         int status;
 914
 915         kref_get(&data->kref);
 916         data->rpc_done = 0;
 917         data->rpc_status = 0;
 918         data->cancelled = 0;
 919         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 920         if (IS_ERR(task))
 921                 return PTR_ERR(task);
 922         status = nfs4_wait_for_completion_rpc_task(task);
 923         if (status != 0) {
 924                 data->cancelled = 1;
 925                 smp_wmb();
 926         } else
 927                 status = data->rpc_status;
 928         rpc_put_task(task);
 929         if (status != 0 || !data->rpc_done)
 930                 return status;
 931
 932         if (o_res->fh.size == 0)
 933                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 934
 935         if (o_arg->open_flags & O_CREAT) {
 936                 update_changeattr(dir, &o_res->cinfo);
 937                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 938         } else
 939                 nfs_refresh_inode(dir, o_res->dir_attr);
 940         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 941                 status = _nfs4_proc_open_confirm(data);
 942                 if (status != 0)
 943                         return status;
 944         }
 945         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 946                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 947         return 0;
 948 }
 949
 950 static int nfs4_recover_expired_lease(struct nfs_server *server)
 951 {
 952         struct nfs_client *clp = server->nfs_client;
 953         int ret;
 954
 955         for (;;) {
 956                 ret = nfs4_wait_clnt_recover(server->client, clp);
 957                 if (ret != 0)
 958                         return ret;
 959                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 960                         break;
 961                 nfs4_schedule_state_recovery(clp);
 962         }
 963         return 0;
 964 }
 965
 966 /*
 967  * OPEN_EXPIRED:
 968  *      reclaim state on the server after a network partition.
 969  *      Assumes caller holds the appropriate lock
 970  */
 971 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 972 {
 973         struct nfs4_opendata *opendata;
 974         int ret;
 975
 976         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 977         if (IS_ERR(opendata))
 978                 return PTR_ERR(opendata);
 979         ret = nfs4_open_recover(opendata, state);
 980         if (ret == -ESTALE) {
 981                 /* Invalidate the state owner so we don't ever use it again */
 982                 nfs4_drop_state_owner(state->owner);
 983                 d_drop(ctx->path.dentry);
 984         }
 985         nfs4_opendata_put(opendata);
 986         return ret;
 987 }
 988
 989 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 990 {
 991         struct nfs_server *server = NFS_SERVER(state->inode);
 992         struct nfs4_exception exception = { };
 993         int err;
 994
 995         do {
 996                 err = _nfs4_open_expired(ctx, state);
 997                 if (err == -NFS4ERR_DELAY)
 998                         nfs4_handle_exception(server, err, &exception);
 999         } while (exception.retry);
1000         return err;
1001 }
1002
1003 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1004 {
1005         struct nfs_open_context *ctx;
1006         int ret;
1007
1008         ctx = nfs4_state_find_open_context(state);
1009         if (IS_ERR(ctx))
1010                 return PTR_ERR(ctx);
1011         ret = nfs4_do_open_expired(ctx, state);
1012         put_nfs_open_context(ctx);
1013         return ret;
1014 }
1015
1016 /*
1017  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1018  * fields corresponding to attributes that were used to store the verifier.
1019  * Make sure we clobber those fields in the later setattr call
1020  */
1021 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1022 {
1023         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1024             !(sattr->ia_valid & ATTR_ATIME_SET))
1025                 sattr->ia_valid |= ATTR_ATIME;
1026
1027         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1028             !(sattr->ia_valid & ATTR_MTIME_SET))
1029                 sattr->ia_valid |= ATTR_MTIME;
1030 }
1031
1032 /*
1033  * Returns a referenced nfs4_state
1034  */
1035 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1036 {
1037         struct nfs4_state_owner  *sp;
1038         struct nfs4_state     *state = NULL;
1039         struct nfs_server       *server = NFS_SERVER(dir);
1040         struct nfs_client *clp = server->nfs_client;
1041         struct nfs4_opendata *opendata;
1042         int status;
1043
1044         /* Protect against reboot recovery conflicts */
1045         status = -ENOMEM;
1046         if (!(sp = nfs4_get_state_owner(server, cred))) {
1047                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1048                 goto out_err;
1049         }
1050         status = nfs4_recover_expired_lease(server);
1051         if (status != 0)
1052                 goto err_put_state_owner;
1053         if (path->dentry->d_inode != NULL)
1054                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1055         down_read(&clp->cl_sem);
1056         status = -ENOMEM;
1057         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1058         if (opendata == NULL)
1059                 goto err_release_rwsem;
1060
1061         if (path->dentry->d_inode != NULL)
1062                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1063
1064         status = _nfs4_proc_open(opendata);
1065         if (status != 0)
1066                 goto err_opendata_put;
1067
1068         if (opendata->o_arg.open_flags & O_EXCL)
1069                 nfs4_exclusive_attrset(opendata, sattr);
1070
1071         state = nfs4_opendata_to_nfs4_state(opendata);
1072         status = PTR_ERR(state);
1073         if (IS_ERR(state))
1074                 goto err_opendata_put;
1075         nfs4_opendata_put(opendata);
1076         nfs4_put_state_owner(sp);
1077         up_read(&clp->cl_sem);
1078         *res = state;
1079         return 0;
1080 err_opendata_put:
1081         nfs4_opendata_put(opendata);
1082 err_release_rwsem:
1083         up_read(&clp->cl_sem);
1084 err_put_state_owner:
1085         nfs4_put_state_owner(sp);
1086 out_err:
1087         *res = NULL;
1088         return status;
1089 }
1090
1091
1092 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1093 {
1094         struct nfs4_exception exception = { };
1095         struct nfs4_state *res;
1096         int status;
1097
1098         do {
1099                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1100                 if (status == 0)
1101                         break;
1102                 /* NOTE: BAD_SEQID means the server and client disagree about the
1103                  * book-keeping w.r.t. state-changing operations
1104                  * (OPEN/CLOSE/LOCK/LOCKU...)
1105                  * It is actually a sign of a bug on the client or on the server.
1106                  *
1107                  * If we receive a BAD_SEQID error in the particular case of
1108                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1109                  * have unhashed the old state_owner for us, and that we can
1110                  * therefore safely retry using a new one. We should still warn
1111                  * the user though...
1112                  */
1113                 if (status == -NFS4ERR_BAD_SEQID) {
1114                         printk(KERN_WARNING "NFS: v4 server %s "
1115                                         " returned a bad sequence-id error!\n",
1116                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1117                         exception.retry = 1;
1118                         continue;
1119                 }
1120                 /*
1121                  * BAD_STATEID on OPEN means that the server cancelled our
1122                  * state before it received the OPEN_CONFIRM.
1123                  * Recover by retrying the request as per the discussion
1124                  * on Page 181 of RFC3530.
1125                  */
1126                 if (status == -NFS4ERR_BAD_STATEID) {
1127                         exception.retry = 1;
1128                         continue;
1129                 }
1130                 if (status == -EAGAIN) {
1131                         /* We must have found a delegation */
1132                         exception.retry = 1;
1133                         continue;
1134                 }
1135                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1136                                         status, &exception));
1137         } while (exception.retry);
1138         return res;
1139 }
1140
1141 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1142                 struct iattr *sattr, struct nfs4_state *state)
1143 {
1144         struct nfs_server *server = NFS_SERVER(inode);
1145         struct nfs_setattrargs  arg = {
1146                 .fh             = NFS_FH(inode),
1147                 .iap            = sattr,
1148                 .server         = server,
1149                 .bitmask = server->attr_bitmask,
1150         };
1151         struct nfs_setattrres  res = {
1152                 .fattr          = fattr,
1153                 .server         = server,
1154         };
1155         struct rpc_message msg = {
1156                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1157                 .rpc_argp       = &arg,
1158                 .rpc_resp       = &res,
1159         };
1160         unsigned long timestamp = jiffies;
1161         int status;
1162
1163         nfs_fattr_init(fattr);
1164
1165         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1166                 /* Use that stateid */
1167         } else if (state != NULL) {
1168                 msg.rpc_cred = state->owner->so_cred;
1169                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1170         } else
1171                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1172
1173         status = rpc_call_sync(server->client, &msg, 0);
1174         if (status == 0 && state != NULL)
1175                 renew_lease(server, timestamp);
1176         return status;
1177 }
1178
1179 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1180                 struct iattr *sattr, struct nfs4_state *state)
1181 {
1182         struct nfs_server *server = NFS_SERVER(inode);
1183         struct nfs4_exception exception = { };
1184         int err;
1185         do {
1186                 err = nfs4_handle_exception(server,
1187                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1188                                 &exception);
1189         } while (exception.retry);
1190         return err;
1191 }
1192
1193 struct nfs4_closedata {
1194         struct path path;
1195         struct inode *inode;
1196         struct nfs4_state *state;
1197         struct nfs_closeargs arg;
1198         struct nfs_closeres res;
1199         struct nfs_fattr fattr;
1200         unsigned long timestamp;
1201 };
1202
1203 static void nfs4_free_closedata(void *data)
1204 {
1205         struct nfs4_closedata *calldata = data;
1206         struct nfs4_state_owner *sp = calldata->state->owner;
1207
1208         nfs4_put_open_state(calldata->state);
1209         nfs_free_seqid(calldata->arg.seqid);
1210         nfs4_put_state_owner(sp);
1211         dput(calldata->path.dentry);
1212         mntput(calldata->path.mnt);
1213         kfree(calldata);
1214 }
1215
1216 static void nfs4_close_done(struct rpc_task *task, void *data)
1217 {
1218         struct nfs4_closedata *calldata = data;
1219         struct nfs4_state *state = calldata->state;
1220         struct nfs_server *server = NFS_SERVER(calldata->inode);
1221
1222         if (RPC_ASSASSINATED(task))
1223                 return;
1224         /* hmm. we are done with the inode, and in the process of freeing
1225          * the state_owner. we keep this around to process errors
1226          */
1227         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1228         switch (task->tk_status) {
1229                 case 0:
1230                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1231                         renew_lease(server, calldata->timestamp);
1232                         break;
1233                 case -NFS4ERR_STALE_STATEID:
1234                 case -NFS4ERR_EXPIRED:
1235                         break;
1236                 default:
1237                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1238                                 rpc_restart_call(task);
1239                                 return;
1240                         }
1241         }
1242         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1243 }
1244
1245 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1246 {
1247         struct nfs4_closedata *calldata = data;
1248         struct nfs4_state *state = calldata->state;
1249         struct rpc_message msg = {
1250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1251                 .rpc_argp = &calldata->arg,
1252                 .rpc_resp = &calldata->res,
1253                 .rpc_cred = state->owner->so_cred,
1254         };
1255         int clear_rd, clear_wr, clear_rdwr;
1256
1257         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1258                 return;
1259
1260         clear_rd = clear_wr = clear_rdwr = 0;
1261         spin_lock(&state->owner->so_lock);
1262         /* Calculate the change in open mode */
1263         if (state->n_rdwr == 0) {
1264                 if (state->n_rdonly == 0) {
1265                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1266                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1267                 }
1268                 if (state->n_wronly == 0) {
1269                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1270                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1271                 }
1272         }
1273         spin_unlock(&state->owner->so_lock);
1274         if (!clear_rd && !clear_wr && !clear_rdwr) {
1275                 /* Note: exit _without_ calling nfs4_close_done */
1276                 task->tk_action = NULL;
1277                 return;
1278         }
1279         nfs_fattr_init(calldata->res.fattr);
1280         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1281                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1282                 calldata->arg.open_flags = FMODE_READ;
1283         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1284                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1285                 calldata->arg.open_flags = FMODE_WRITE;
1286         }
1287         calldata->timestamp = jiffies;
1288         rpc_call_setup(task, &msg, 0);
1289 }
1290
1291 static const struct rpc_call_ops nfs4_close_ops = {
1292         .rpc_call_prepare = nfs4_close_prepare,
1293         .rpc_call_done = nfs4_close_done,
1294         .rpc_release = nfs4_free_closedata,
1295 };
1296
1297 /*
1298  * It is possible for data to be read/written from a mem-mapped file
1299  * after the sys_close call (which hits the vfs layer as a flush).
1300  * This means that we can't safely call nfsv4 close on a file until
1301  * the inode is cleared. This in turn means that we are not good
1302  * NFSv4 citizens - we do not indicate to the server to update the file's
1303  * share state even when we are done with one of the three share
1304  * stateid's in the inode.
1305  *
1306  * NOTE: Caller must be holding the sp->so_owner semaphore!
1307  */
1308 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1309 {
1310         struct nfs_server *server = NFS_SERVER(state->inode);
1311         struct nfs4_closedata *calldata;
1312         struct nfs4_state_owner *sp = state->owner;
1313         struct rpc_task *task;
1314         int status = -ENOMEM;
1315
1316         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1317         if (calldata == NULL)
1318                 goto out;
1319         calldata->inode = state->inode;
1320         calldata->state = state;
1321         calldata->arg.fh = NFS_FH(state->inode);
1322         calldata->arg.stateid = &state->open_stateid;
1323         /* Serialization for the sequence id */
1324         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1325         if (calldata->arg.seqid == NULL)
1326                 goto out_free_calldata;
1327         calldata->arg.bitmask = server->attr_bitmask;
1328         calldata->res.fattr = &calldata->fattr;
1329         calldata->res.server = server;
1330         calldata->path.mnt = mntget(path->mnt);
1331         calldata->path.dentry = dget(path->dentry);
1332
1333         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1334         if (IS_ERR(task))
1335                 return PTR_ERR(task);
1336         status = 0;
1337         if (wait)
1338                 status = rpc_wait_for_completion_task(task);
1339         rpc_put_task(task);
1340         return status;
1341 out_free_calldata:
1342         kfree(calldata);
1343 out:
1344         nfs4_put_open_state(state);
1345         nfs4_put_state_owner(sp);
1346         return status;
1347 }
1348
1349 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1350 {
1351         struct file *filp;
1352         int ret;
1353
1354         /* If the open_intent is for execute, we have an extra check to make */
1355         if (nd->intent.open.flags & FMODE_EXEC) {
1356                 ret = nfs_may_open(state->inode,
1357                                 state->owner->so_cred,
1358                                 nd->intent.open.flags);
1359                 if (ret < 0)
1360                         goto out_close;
1361         }
1362         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1363         if (!IS_ERR(filp)) {
1364                 struct nfs_open_context *ctx;
1365                 ctx = nfs_file_open_context(filp);
1366                 ctx->state = state;
1367                 return 0;
1368         }
1369         ret = PTR_ERR(filp);
1370 out_close:
1371         nfs4_close_sync(path, state, nd->intent.open.flags);
1372         return ret;
1373 }
1374
1375 struct dentry *
1376 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1377 {
1378         struct dentry *parent;
1379         struct path path = {
1380                 .mnt = nd->mnt,
1381                 .dentry = dentry,
1382         };
1383         struct iattr attr;
1384         struct rpc_cred *cred;
1385         struct nfs4_state *state;
1386         struct dentry *res;
1387
1388         if (nd->flags & LOOKUP_CREATE) {
1389                 attr.ia_mode = nd->intent.open.create_mode;
1390                 attr.ia_valid = ATTR_MODE;
1391                 if (!IS_POSIXACL(dir))
1392                         attr.ia_mode &= ~current->fs->umask;
1393         } else {
1394                 attr.ia_valid = 0;
1395                 BUG_ON(nd->intent.open.flags & O_CREAT);
1396         }
1397
1398         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1399         if (IS_ERR(cred))
1400                 return (struct dentry *)cred;
1401         parent = dentry->d_parent;
1402         /* Protect against concurrent sillydeletes */
1403         nfs_block_sillyrename(parent);
1404         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1405         put_rpccred(cred);
1406         if (IS_ERR(state)) {
1407                 if (PTR_ERR(state) == -ENOENT) {
1408                         d_add(dentry, NULL);
1409                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1410                 }
1411                 nfs_unblock_sillyrename(parent);
1412                 return (struct dentry *)state;
1413         }
1414         res = d_add_unique(dentry, igrab(state->inode));
1415         if (res != NULL)
1416                 path.dentry = res;
1417         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1418         nfs_unblock_sillyrename(parent);
1419         nfs4_intent_set_file(nd, &path, state);
1420         return res;
1421 }
1422
1423 int
1424 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1425 {
1426         struct path path = {
1427                 .mnt = nd->mnt,
1428                 .dentry = dentry,
1429         };
1430         struct rpc_cred *cred;
1431         struct nfs4_state *state;
1432
1433         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1434         if (IS_ERR(cred))
1435                 return PTR_ERR(cred);
1436         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1437         put_rpccred(cred);
1438         if (IS_ERR(state)) {
1439                 switch (PTR_ERR(state)) {
1440                         case -EPERM:
1441                         case -EACCES:
1442                         case -EDQUOT:
1443                         case -ENOSPC:
1444                         case -EROFS:
1445                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1446                                 return 1;
1447                         default:
1448                                 goto out_drop;
1449                 }
1450         }
1451         if (state->inode == dentry->d_inode) {
1452                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1453                 nfs4_intent_set_file(nd, &path, state);
1454                 return 1;
1455         }
1456         nfs4_close_sync(&path, state, openflags);
1457 out_drop:
1458         d_drop(dentry);
1459         return 0;
1460 }
1461
1462
1463 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1464 {
1465         struct nfs4_server_caps_res res = {};
1466         struct rpc_message msg = {
1467                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1468                 .rpc_argp = fhandle,
1469                 .rpc_resp = &res,
1470         };
1471         int status;
1472
1473         status = rpc_call_sync(server->client, &msg, 0);
1474         if (status == 0) {
1475                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1476                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1477                         server->caps |= NFS_CAP_ACLS;
1478                 if (res.has_links != 0)
1479                         server->caps |= NFS_CAP_HARDLINKS;
1480                 if (res.has_symlinks != 0)
1481                         server->caps |= NFS_CAP_SYMLINKS;
1482                 server->acl_bitmask = res.acl_bitmask;
1483         }
1484         return status;
1485 }
1486
1487 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1488 {
1489         struct nfs4_exception exception = { };
1490         int err;
1491         do {
1492                 err = nfs4_handle_exception(server,
1493                                 _nfs4_server_capabilities(server, fhandle),
1494                                 &exception);
1495         } while (exception.retry);
1496         return err;
1497 }
1498
1499 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1500                 struct nfs_fsinfo *info)
1501 {
1502         struct nfs4_lookup_root_arg args = {
1503                 .bitmask = nfs4_fattr_bitmap,
1504         };
1505         struct nfs4_lookup_res res = {
1506                 .server = server,
1507                 .fattr = info->fattr,
1508                 .fh = fhandle,
1509         };
1510         struct rpc_message msg = {
1511                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1512                 .rpc_argp = &args,
1513                 .rpc_resp = &res,
1514         };
1515         nfs_fattr_init(info->fattr);
1516         return rpc_call_sync(server->client, &msg, 0);
1517 }
1518
1519 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1520                 struct nfs_fsinfo *info)
1521 {
1522         struct nfs4_exception exception = { };
1523         int err;
1524         do {
1525                 err = nfs4_handle_exception(server,
1526                                 _nfs4_lookup_root(server, fhandle, info),
1527                                 &exception);
1528         } while (exception.retry);
1529         return err;
1530 }
1531
1532 /*
1533  * get the file handle for the "/" directory on the server
1534  */
1535 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1536                               struct nfs_fsinfo *info)
1537 {
1538         int status;
1539
1540         status = nfs4_lookup_root(server, fhandle, info);
1541         if (status == 0)
1542                 status = nfs4_server_capabilities(server, fhandle);
1543         if (status == 0)
1544                 status = nfs4_do_fsinfo(server, fhandle, info);
1545         return nfs4_map_errors(status);
1546 }
1547
1548 /*
1549  * Get locations and (maybe) other attributes of a referral.
1550  * Note that we'll actually follow the referral later when
1551  * we detect fsid mismatch in inode revalidation
1552  */
1553 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1554 {
1555         int status = -ENOMEM;
1556         struct page *page = NULL;
1557         struct nfs4_fs_locations *locations = NULL;
1558
1559         page = alloc_page(GFP_KERNEL);
1560         if (page == NULL)
1561                 goto out;
1562         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1563         if (locations == NULL)
1564                 goto out;
1565
1566         status = nfs4_proc_fs_locations(dir, name, locations, page);
1567         if (status != 0)
1568                 goto out;
1569         /* Make sure server returned a different fsid for the referral */
1570         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1571                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1572                 status = -EIO;
1573                 goto out;
1574         }
1575
1576         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1577         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1578         if (!fattr->mode)
1579                 fattr->mode = S_IFDIR;
1580         memset(fhandle, 0, sizeof(struct nfs_fh));
1581 out:
1582         if (page)
1583                 __free_page(page);
1584         if (locations)
1585                 kfree(locations);
1586         return status;
1587 }
1588
1589 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1590 {
1591         struct nfs4_getattr_arg args = {
1592                 .fh = fhandle,
1593                 .bitmask = server->attr_bitmask,
1594         };
1595         struct nfs4_getattr_res res = {
1596                 .fattr = fattr,
1597                 .server = server,
1598         };
1599         struct rpc_message msg = {
1600                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1601                 .rpc_argp = &args,
1602                 .rpc_resp = &res,
1603         };
1604
1605         nfs_fattr_init(fattr);
1606         return rpc_call_sync(server->client, &msg, 0);
1607 }
1608
1609 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1610 {
1611         struct nfs4_exception exception = { };
1612         int err;
1613         do {
1614                 err = nfs4_handle_exception(server,
1615                                 _nfs4_proc_getattr(server, fhandle, fattr),
1616                                 &exception);
1617         } while (exception.retry);
1618         return err;
1619 }
1620
1621 /*
1622  * The file is not closed if it is opened due to the a request to change
1623  * the size of the file. The open call will not be needed once the
1624  * VFS layer lookup-intents are implemented.
1625  *
1626  * Close is called when the inode is destroyed.
1627  * If we haven't opened the file for O_WRONLY, we
1628  * need to in the size_change case to obtain a stateid.
1629  *
1630  * Got race?
1631  * Because OPEN is always done by name in nfsv4, it is
1632  * possible that we opened a different file by the same
1633  * name.  We can recognize this race condition, but we
1634  * can't do anything about it besides returning an error.
1635  *
1636  * This will be fixed with VFS changes (lookup-intent).
1637  */
1638 static int
1639 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1640                   struct iattr *sattr)
1641 {
1642         struct rpc_cred *cred;
1643         struct inode *inode = dentry->d_inode;
1644         struct nfs_open_context *ctx;
1645         struct nfs4_state *state = NULL;
1646         int status;
1647
1648         nfs_fattr_init(fattr);
1649
1650         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1651         if (IS_ERR(cred))
1652                 return PTR_ERR(cred);
1653
1654         /* Search for an existing open(O_WRITE) file */
1655         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1656         if (ctx != NULL)
1657                 state = ctx->state;
1658
1659         status = nfs4_do_setattr(inode, fattr, sattr, state);
1660         if (status == 0)
1661                 nfs_setattr_update_inode(inode, sattr);
1662         if (ctx != NULL)
1663                 put_nfs_open_context(ctx);
1664         put_rpccred(cred);
1665         return status;
1666 }
1667
1668 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1669                 const struct qstr *name, struct nfs_fh *fhandle,
1670                 struct nfs_fattr *fattr)
1671 {
1672         int                    status;
1673         struct nfs4_lookup_arg args = {
1674                 .bitmask = server->attr_bitmask,
1675                 .dir_fh = dirfh,
1676                 .name = name,
1677         };
1678         struct nfs4_lookup_res res = {
1679                 .server = server,
1680                 .fattr = fattr,
1681                 .fh = fhandle,
1682         };
1683         struct rpc_message msg = {
1684                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1685                 .rpc_argp = &args,
1686                 .rpc_resp = &res,
1687         };
1688
1689         nfs_fattr_init(fattr);
1690
1691         dprintk("NFS call  lookupfh %s\n", name->name);
1692         status = rpc_call_sync(server->client, &msg, 0);
1693         dprintk("NFS reply lookupfh: %d\n", status);
1694         return status;
1695 }
1696
1697 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1698                               struct qstr *name, struct nfs_fh *fhandle,
1699                               struct nfs_fattr *fattr)
1700 {
1701         struct nfs4_exception exception = { };
1702         int err;
1703         do {
1704                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1705                 /* FIXME: !!!! */
1706                 if (err == -NFS4ERR_MOVED) {
1707                         err = -EREMOTE;
1708                         break;
1709                 }
1710                 err = nfs4_handle_exception(server, err, &exception);
1711         } while (exception.retry);
1712         return err;
1713 }
1714
1715 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1716                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1717 {
1718         int status;
1719
1720         dprintk("NFS call  lookup %s\n", name->name);
1721         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1722         if (status == -NFS4ERR_MOVED)
1723                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1724         dprintk("NFS reply lookup: %d\n", status);
1725         return status;
1726 }
1727
1728 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1729 {
1730         struct nfs4_exception exception = { };
1731         int err;
1732         do {
1733                 err = nfs4_handle_exception(NFS_SERVER(dir),
1734                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1735                                 &exception);
1736         } while (exception.retry);
1737         return err;
1738 }
1739
1740 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1741 {
1742         struct nfs_server *server = NFS_SERVER(inode);
1743         struct nfs_fattr fattr;
1744         struct nfs4_accessargs args = {
1745                 .fh = NFS_FH(inode),
1746                 .bitmask = server->attr_bitmask,
1747         };
1748         struct nfs4_accessres res = {
1749                 .server = server,
1750                 .fattr = &fattr,
1751         };
1752         struct rpc_message msg = {
1753                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1754                 .rpc_argp = &args,
1755                 .rpc_resp = &res,
1756                 .rpc_cred = entry->cred,
1757         };
1758         int mode = entry->mask;
1759         int status;
1760
1761         /*
1762          * Determine which access bits we want to ask for...
1763          */
1764         if (mode & MAY_READ)
1765                 args.access |= NFS4_ACCESS_READ;
1766         if (S_ISDIR(inode->i_mode)) {
1767                 if (mode & MAY_WRITE)
1768                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1769                 if (mode & MAY_EXEC)
1770                         args.access |= NFS4_ACCESS_LOOKUP;
1771         } else {
1772                 if (mode & MAY_WRITE)
1773                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1774                 if (mode & MAY_EXEC)
1775                         args.access |= NFS4_ACCESS_EXECUTE;
1776         }
1777         nfs_fattr_init(&fattr);
1778         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1779         if (!status) {
1780                 entry->mask = 0;
1781                 if (res.access & NFS4_ACCESS_READ)
1782                         entry->mask |= MAY_READ;
1783                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1784                         entry->mask |= MAY_WRITE;
1785                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1786                         entry->mask |= MAY_EXEC;
1787                 nfs_refresh_inode(inode, &fattr);
1788         }
1789         return status;
1790 }
1791
1792 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1793 {
1794         struct nfs4_exception exception = { };
1795         int err;
1796         do {
1797                 err = nfs4_handle_exception(NFS_SERVER(inode),
1798                                 _nfs4_proc_access(inode, entry),
1799                                 &exception);
1800         } while (exception.retry);
1801         return err;
1802 }
1803
1804 /*
1805  * TODO: For the time being, we don't try to get any attributes
1806  * along with any of the zero-copy operations READ, READDIR,
1807  * READLINK, WRITE.
1808  *
1809  * In the case of the first three, we want to put the GETATTR
1810  * after the read-type operation -- this is because it is hard
1811  * to predict the length of a GETATTR response in v4, and thus
1812  * align the READ data correctly.  This means that the GETATTR
1813  * may end up partially falling into the page cache, and we should
1814  * shift it into the 'tail' of the xdr_buf before processing.
1815  * To do this efficiently, we need to know the total length
1816  * of data received, which doesn't seem to be available outside
1817  * of the RPC layer.
1818  *
1819  * In the case of WRITE, we also want to put the GETATTR after
1820  * the operation -- in this case because we want to make sure
1821  * we get the post-operation mtime and size.  This means that
1822  * we can't use xdr_encode_pages() as written: we need a variant
1823  * of it which would leave room in the 'tail' iovec.
1824  *
1825  * Both of these changes to the XDR layer would in fact be quite
1826  * minor, but I decided to leave them for a subsequent patch.
1827  */
1828 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1829                 unsigned int pgbase, unsigned int pglen)
1830 {
1831         struct nfs4_readlink args = {
1832                 .fh       = NFS_FH(inode),
1833                 .pgbase   = pgbase,
1834                 .pglen    = pglen,
1835                 .pages    = &page,
1836         };
1837         struct rpc_message msg = {
1838                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1839                 .rpc_argp = &args,
1840                 .rpc_resp = NULL,
1841         };
1842
1843         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1844 }
1845
1846 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1847                 unsigned int pgbase, unsigned int pglen)
1848 {
1849         struct nfs4_exception exception = { };
1850         int err;
1851         do {
1852                 err = nfs4_handle_exception(NFS_SERVER(inode),
1853                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1854                                 &exception);
1855         } while (exception.retry);
1856         return err;
1857 }
1858
1859 /*
1860  * Got race?
1861  * We will need to arrange for the VFS layer to provide an atomic open.
1862  * Until then, this create/open method is prone to inefficiency and race
1863  * conditions due to the lookup, create, and open VFS calls from sys_open()
1864  * placed on the wire.
1865  *
1866  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1867  * The file will be opened again in the subsequent VFS open call
1868  * (nfs4_proc_file_open).
1869  *
1870  * The open for read will just hang around to be used by any process that
1871  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1872  */
1873
1874 static int
1875 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1876                  int flags, struct nameidata *nd)
1877 {
1878         struct path path = {
1879                 .mnt = nd->mnt,
1880                 .dentry = dentry,
1881         };
1882         struct nfs4_state *state;
1883         struct rpc_cred *cred;
1884         int status = 0;
1885
1886         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1887         if (IS_ERR(cred)) {
1888                 status = PTR_ERR(cred);
1889                 goto out;
1890         }
1891         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1892         put_rpccred(cred);
1893         d_drop(dentry);
1894         if (IS_ERR(state)) {
1895                 status = PTR_ERR(state);
1896                 goto out;
1897         }
1898         d_add(dentry, igrab(state->inode));
1899         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1900         if (flags & O_EXCL) {
1901                 struct nfs_fattr fattr;
1902                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1903                 if (status == 0)
1904                         nfs_setattr_update_inode(state->inode, sattr);
1905                 nfs_post_op_update_inode(state->inode, &fattr);
1906         }
1907         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1908                 status = nfs4_intent_set_file(nd, &path, state);
1909         else
1910                 nfs4_close_sync(&path, state, flags);
1911 out:
1912         return status;
1913 }
1914
1915 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1916 {
1917         struct nfs_server *server = NFS_SERVER(dir);
1918         struct nfs_removeargs args = {
1919                 .fh = NFS_FH(dir),
1920                 .name.len = name->len,
1921                 .name.name = name->name,
1922                 .bitmask = server->attr_bitmask,
1923         };
1924         struct nfs_removeres res = {
1925                 .server = server,
1926         };
1927         struct rpc_message msg = {
1928                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1929                 .rpc_argp = &args,
1930                 .rpc_resp = &res,
1931         };
1932         int                     status;
1933
1934         nfs_fattr_init(&res.dir_attr);
1935         status = rpc_call_sync(server->client, &msg, 0);
1936         if (status == 0) {
1937                 update_changeattr(dir, &res.cinfo);
1938                 nfs_post_op_update_inode(dir, &res.dir_attr);
1939         }
1940         return status;
1941 }
1942
1943 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1944 {
1945         struct nfs4_exception exception = { };
1946         int err;
1947         do {
1948                 err = nfs4_handle_exception(NFS_SERVER(dir),
1949                                 _nfs4_proc_remove(dir, name),
1950                                 &exception);
1951         } while (exception.retry);
1952         return err;
1953 }
1954
1955 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1956 {
1957         struct nfs_server *server = NFS_SERVER(dir);
1958         struct nfs_removeargs *args = msg->rpc_argp;
1959         struct nfs_removeres *res = msg->rpc_resp;
1960
1961         args->bitmask = server->attr_bitmask;
1962         res->server = server;
1963         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1964 }
1965
1966 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1967 {
1968         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1969
1970         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1971                 return 0;
1972         update_changeattr(dir, &res->cinfo);
1973         nfs_post_op_update_inode(dir, &res->dir_attr);
1974         return 1;
1975 }
1976
1977 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1978                 struct inode *new_dir, struct qstr *new_name)
1979 {
1980         struct nfs_server *server = NFS_SERVER(old_dir);
1981         struct nfs4_rename_arg arg = {
1982                 .old_dir = NFS_FH(old_dir),
1983                 .new_dir = NFS_FH(new_dir),
1984                 .old_name = old_name,
1985                 .new_name = new_name,
1986                 .bitmask = server->attr_bitmask,
1987         };
1988         struct nfs_fattr old_fattr, new_fattr;
1989         struct nfs4_rename_res res = {
1990                 .server = server,
1991                 .old_fattr = &old_fattr,
1992                 .new_fattr = &new_fattr,
1993         };
1994         struct rpc_message msg = {
1995                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1996                 .rpc_argp = &arg,
1997                 .rpc_resp = &res,
1998         };
1999         int                     status;
2000
2001         nfs_fattr_init(res.old_fattr);
2002         nfs_fattr_init(res.new_fattr);
2003         status = rpc_call_sync(server->client, &msg, 0);
2004
2005         if (!status) {
2006                 update_changeattr(old_dir, &res.old_cinfo);
2007                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2008                 update_changeattr(new_dir, &res.new_cinfo);
2009                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2010         }
2011         return status;
2012 }
2013
2014 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2015                 struct inode *new_dir, struct qstr *new_name)
2016 {
2017         struct nfs4_exception exception = { };
2018         int err;
2019         do {
2020                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2021                                 _nfs4_proc_rename(old_dir, old_name,
2022                                         new_dir, new_name),
2023                                 &exception);
2024         } while (exception.retry);
2025         return err;
2026 }
2027
2028 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2029 {
2030         struct nfs_server *server = NFS_SERVER(inode);
2031         struct nfs4_link_arg arg = {
2032                 .fh     = NFS_FH(inode),
2033                 .dir_fh = NFS_FH(dir),
2034                 .name   = name,
2035                 .bitmask = server->attr_bitmask,
2036         };
2037         struct nfs_fattr fattr, dir_attr;
2038         struct nfs4_link_res res = {
2039                 .server = server,
2040                 .fattr = &fattr,
2041                 .dir_attr = &dir_attr,
2042         };
2043         struct rpc_message msg = {
2044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2045                 .rpc_argp = &arg,
2046                 .rpc_resp = &res,
2047         };
2048         int                     status;
2049
2050         nfs_fattr_init(res.fattr);
2051         nfs_fattr_init(res.dir_attr);
2052         status = rpc_call_sync(server->client, &msg, 0);
2053         if (!status) {
2054                 update_changeattr(dir, &res.cinfo);
2055                 nfs_post_op_update_inode(dir, res.dir_attr);
2056                 nfs_post_op_update_inode(inode, res.fattr);
2057         }
2058
2059         return status;
2060 }
2061
2062 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2063 {
2064         struct nfs4_exception exception = { };
2065         int err;
2066         do {
2067                 err = nfs4_handle_exception(NFS_SERVER(inode),
2068                                 _nfs4_proc_link(inode, dir, name),
2069                                 &exception);
2070         } while (exception.retry);
2071         return err;
2072 }
2073
2074 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2075                 struct page *page, unsigned int len, struct iattr *sattr)
2076 {
2077         struct nfs_server *server = NFS_SERVER(dir);
2078         struct nfs_fh fhandle;
2079         struct nfs_fattr fattr, dir_fattr;
2080         struct nfs4_create_arg arg = {
2081                 .dir_fh = NFS_FH(dir),
2082                 .server = server,
2083                 .name = &dentry->d_name,
2084                 .attrs = sattr,
2085                 .ftype = NF4LNK,
2086                 .bitmask = server->attr_bitmask,
2087         };
2088         struct nfs4_create_res res = {
2089                 .server = server,
2090                 .fh = &fhandle,
2091                 .fattr = &fattr,
2092                 .dir_fattr = &dir_fattr,
2093         };
2094         struct rpc_message msg = {
2095                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2096                 .rpc_argp = &arg,
2097                 .rpc_resp = &res,
2098         };
2099         int                     status;
2100
2101         if (len > NFS4_MAXPATHLEN)
2102                 return -ENAMETOOLONG;
2103
2104         arg.u.symlink.pages = &page;
2105         arg.u.symlink.len = len;
2106         nfs_fattr_init(&fattr);
2107         nfs_fattr_init(&dir_fattr);
2108
2109         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2110         if (!status) {
2111                 update_changeattr(dir, &res.dir_cinfo);
2112                 nfs_post_op_update_inode(dir, res.dir_fattr);
2113                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2114         }
2115         return status;
2116 }
2117
2118 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2119                 struct page *page, unsigned int len, struct iattr *sattr)
2120 {
2121         struct nfs4_exception exception = { };
2122         int err;
2123         do {
2124                 err = nfs4_handle_exception(NFS_SERVER(dir),
2125                                 _nfs4_proc_symlink(dir, dentry, page,
2126                                                         len, sattr),
2127                                 &exception);
2128         } while (exception.retry);
2129         return err;
2130 }
2131
2132 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2133                 struct iattr *sattr)
2134 {
2135         struct nfs_server *server = NFS_SERVER(dir);
2136         struct nfs_fh fhandle;
2137         struct nfs_fattr fattr, dir_fattr;
2138         struct nfs4_create_arg arg = {
2139                 .dir_fh = NFS_FH(dir),
2140                 .server = server,
2141                 .name = &dentry->d_name,
2142                 .attrs = sattr,
2143                 .ftype = NF4DIR,
2144                 .bitmask = server->attr_bitmask,
2145         };
2146         struct nfs4_create_res res = {
2147                 .server = server,
2148                 .fh = &fhandle,
2149                 .fattr = &fattr,
2150                 .dir_fattr = &dir_fattr,
2151         };
2152         struct rpc_message msg = {
2153                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2154                 .rpc_argp = &arg,
2155                 .rpc_resp = &res,
2156         };
2157         int                     status;
2158
2159         nfs_fattr_init(&fattr);
2160         nfs_fattr_init(&dir_fattr);
2161
2162         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2163         if (!status) {
2164                 update_changeattr(dir, &res.dir_cinfo);
2165                 nfs_post_op_update_inode(dir, res.dir_fattr);
2166                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2167         }
2168         return status;
2169 }
2170
2171 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2172                 struct iattr *sattr)
2173 {
2174         struct nfs4_exception exception = { };
2175         int err;
2176         do {
2177                 err = nfs4_handle_exception(NFS_SERVER(dir),
2178                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2179                                 &exception);
2180         } while (exception.retry);
2181         return err;
2182 }
2183
2184 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2185                   u64 cookie, struct page *page, unsigned int count, int plus)
2186 {
2187         struct inode            *dir = dentry->d_inode;
2188         struct nfs4_readdir_arg args = {
2189                 .fh = NFS_FH(dir),
2190                 .pages = &page,
2191                 .pgbase = 0,
2192                 .count = count,
2193                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2194         };
2195         struct nfs4_readdir_res res;
2196         struct rpc_message msg = {
2197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2198                 .rpc_argp = &args,
2199                 .rpc_resp = &res,
2200                 .rpc_cred = cred,
2201         };
2202         int                     status;
2203
2204         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2205                         dentry->d_parent->d_name.name,
2206                         dentry->d_name.name,
2207                         (unsigned long long)cookie);
2208         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2209         res.pgbase = args.pgbase;
2210         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2211         if (status == 0)
2212                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2213
2214         nfs_invalidate_atime(dir);
2215
2216         dprintk("%s: returns %d\n", __FUNCTION__, status);
2217         return status;
2218 }
2219
2220 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2221                   u64 cookie, struct page *page, unsigned int count, int plus)
2222 {
2223         struct nfs4_exception exception = { };
2224         int err;
2225         do {
2226                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2227                                 _nfs4_proc_readdir(dentry, cred, cookie,
2228                                         page, count, plus),
2229                                 &exception);
2230         } while (exception.retry);
2231         return err;
2232 }
2233
2234 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2235                 struct iattr *sattr, dev_t rdev)
2236 {
2237         struct nfs_server *server = NFS_SERVER(dir);
2238         struct nfs_fh fh;
2239         struct nfs_fattr fattr, dir_fattr;
2240         struct nfs4_create_arg arg = {
2241                 .dir_fh = NFS_FH(dir),
2242                 .server = server,
2243                 .name = &dentry->d_name,
2244                 .attrs = sattr,
2245                 .bitmask = server->attr_bitmask,
2246         };
2247         struct nfs4_create_res res = {
2248                 .server = server,
2249                 .fh = &fh,
2250                 .fattr = &fattr,
2251                 .dir_fattr = &dir_fattr,
2252         };
2253         struct rpc_message msg = {
2254                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2255                 .rpc_argp = &arg,
2256                 .rpc_resp = &res,
2257         };
2258         int                     status;
2259         int                     mode = sattr->ia_mode;
2260
2261         nfs_fattr_init(&fattr);
2262         nfs_fattr_init(&dir_fattr);
2263
2264         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2265         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2266         if (S_ISFIFO(mode))
2267                 arg.ftype = NF4FIFO;
2268         else if (S_ISBLK(mode)) {
2269                 arg.ftype = NF4BLK;
2270                 arg.u.device.specdata1 = MAJOR(rdev);
2271                 arg.u.device.specdata2 = MINOR(rdev);
2272         }
2273         else if (S_ISCHR(mode)) {
2274                 arg.ftype = NF4CHR;
2275                 arg.u.device.specdata1 = MAJOR(rdev);
2276                 arg.u.device.specdata2 = MINOR(rdev);
2277         }
2278         else
2279                 arg.ftype = NF4SOCK;
2280
2281         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2282         if (status == 0) {
2283                 update_changeattr(dir, &res.dir_cinfo);
2284                 nfs_post_op_update_inode(dir, res.dir_fattr);
2285                 status = nfs_instantiate(dentry, &fh, &fattr);
2286         }
2287         return status;
2288 }
2289
2290 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2291                 struct iattr *sattr, dev_t rdev)
2292 {
2293         struct nfs4_exception exception = { };
2294         int err;
2295         do {
2296                 err = nfs4_handle_exception(NFS_SERVER(dir),
2297                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2298                                 &exception);
2299         } while (exception.retry);
2300         return err;
2301 }
2302
2303 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2304                  struct nfs_fsstat *fsstat)
2305 {
2306         struct nfs4_statfs_arg args = {
2307                 .fh = fhandle,
2308                 .bitmask = server->attr_bitmask,
2309         };
2310         struct rpc_message msg = {
2311                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2312                 .rpc_argp = &args,
2313                 .rpc_resp = fsstat,
2314         };
2315
2316         nfs_fattr_init(fsstat->fattr);
2317         return rpc_call_sync(server->client, &msg, 0);
2318 }
2319
2320 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2321 {
2322         struct nfs4_exception exception = { };
2323         int err;
2324         do {
2325                 err = nfs4_handle_exception(server,
2326                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2327                                 &exception);
2328         } while (exception.retry);
2329         return err;
2330 }
2331
2332 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2333                 struct nfs_fsinfo *fsinfo)
2334 {
2335         struct nfs4_fsinfo_arg args = {
2336                 .fh = fhandle,
2337                 .bitmask = server->attr_bitmask,
2338         };
2339         struct rpc_message msg = {
2340                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2341                 .rpc_argp = &args,
2342                 .rpc_resp = fsinfo,
2343         };
2344
2345         return rpc_call_sync(server->client, &msg, 0);
2346 }
2347
2348 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2349 {
2350         struct nfs4_exception exception = { };
2351         int err;
2352
2353         do {
2354                 err = nfs4_handle_exception(server,
2355                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2356                                 &exception);
2357         } while (exception.retry);
2358         return err;
2359 }
2360
2361 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2362 {
2363         nfs_fattr_init(fsinfo->fattr);
2364         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2365 }
2366
2367 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2368                 struct nfs_pathconf *pathconf)
2369 {
2370         struct nfs4_pathconf_arg args = {
2371                 .fh = fhandle,
2372                 .bitmask = server->attr_bitmask,
2373         };
2374         struct rpc_message msg = {
2375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2376                 .rpc_argp = &args,
2377                 .rpc_resp = pathconf,
2378         };
2379
2380         /* None of the pathconf attributes are mandatory to implement */
2381         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2382                 memset(pathconf, 0, sizeof(*pathconf));
2383                 return 0;
2384         }
2385
2386         nfs_fattr_init(pathconf->fattr);
2387         return rpc_call_sync(server->client, &msg, 0);
2388 }
2389
2390 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2391                 struct nfs_pathconf *pathconf)
2392 {
2393         struct nfs4_exception exception = { };
2394         int err;
2395
2396         do {
2397                 err = nfs4_handle_exception(server,
2398                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2399                                 &exception);
2400         } while (exception.retry);
2401         return err;
2402 }
2403
2404 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2405 {
2406         struct nfs_server *server = NFS_SERVER(data->inode);
2407
2408         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2409                 rpc_restart_call(task);
2410                 return -EAGAIN;
2411         }
2412
2413         nfs_invalidate_atime(data->inode);
2414         if (task->tk_status > 0)
2415                 renew_lease(server, data->timestamp);
2416         return 0;
2417 }
2418
2419 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2420 {
2421         struct rpc_message msg = {
2422                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2423                 .rpc_argp = &data->args,
2424                 .rpc_resp = &data->res,
2425                 .rpc_cred = data->cred,
2426         };
2427
2428         data->timestamp   = jiffies;
2429
2430         rpc_call_setup(&data->task, &msg, 0);
2431 }
2432
2433 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2434 {
2435         struct inode *inode = data->inode;
2436
2437         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2438                 rpc_restart_call(task);
2439                 return -EAGAIN;
2440         }
2441         if (task->tk_status >= 0) {
2442                 renew_lease(NFS_SERVER(inode), data->timestamp);
2443                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2444         }
2445         return 0;
2446 }
2447
2448 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2449 {
2450         struct rpc_message msg = {
2451                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2452                 .rpc_argp = &data->args,
2453                 .rpc_resp = &data->res,
2454                 .rpc_cred = data->cred,
2455         };
2456         struct inode *inode = data->inode;
2457         struct nfs_server *server = NFS_SERVER(inode);
2458         int stable;
2459
2460         if (how & FLUSH_STABLE) {
2461                 if (!NFS_I(inode)->ncommit)
2462                         stable = NFS_FILE_SYNC;
2463                 else
2464                         stable = NFS_DATA_SYNC;
2465         } else
2466                 stable = NFS_UNSTABLE;
2467         data->args.stable = stable;
2468         data->args.bitmask = server->attr_bitmask;
2469         data->res.server = server;
2470
2471         data->timestamp   = jiffies;
2472
2473         /* Finalize the task. */
2474         rpc_call_setup(&data->task, &msg, 0);
2475 }
2476
2477 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2478 {
2479         struct inode *inode = data->inode;
2480
2481         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2482                 rpc_restart_call(task);
2483                 return -EAGAIN;
2484         }
2485         nfs_refresh_inode(inode, data->res.fattr);
2486         return 0;
2487 }
2488
2489 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2490 {
2491         struct rpc_message msg = {
2492                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2493                 .rpc_argp = &data->args,
2494                 .rpc_resp = &data->res,
2495                 .rpc_cred = data->cred,
2496         };
2497         struct nfs_server *server = NFS_SERVER(data->inode);
2498
2499         data->args.bitmask = server->attr_bitmask;
2500         data->res.server = server;
2501
2502         rpc_call_setup(&data->task, &msg, 0);
2503 }
2504
2505 /*
2506  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2507  * standalone procedure for queueing an asynchronous RENEW.
2508  */
2509 static void nfs4_renew_done(struct rpc_task *task, void *data)
2510 {
2511         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2512         unsigned long timestamp = (unsigned long)data;
2513
2514         if (task->tk_status < 0) {
2515                 switch (task->tk_status) {
2516                         case -NFS4ERR_STALE_CLIENTID:
2517                         case -NFS4ERR_EXPIRED:
2518                         case -NFS4ERR_CB_PATH_DOWN:
2519                                 nfs4_schedule_state_recovery(clp);
2520                 }
2521                 return;
2522         }
2523         spin_lock(&clp->cl_lock);
2524         if (time_before(clp->cl_last_renewal,timestamp))
2525                 clp->cl_last_renewal = timestamp;
2526         spin_unlock(&clp->cl_lock);
2527 }
2528
2529 static const struct rpc_call_ops nfs4_renew_ops = {
2530         .rpc_call_done = nfs4_renew_done,
2531 };
2532
2533 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2534 {
2535         struct rpc_message msg = {
2536                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2537                 .rpc_argp       = clp,
2538                 .rpc_cred       = cred,
2539         };
2540
2541         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2542                         &nfs4_renew_ops, (void *)jiffies);
2543 }
2544
2545 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2546 {
2547         struct rpc_message msg = {
2548                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2549                 .rpc_argp       = clp,
2550                 .rpc_cred       = cred,
2551         };
2552         unsigned long now = jiffies;
2553         int status;
2554
2555         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2556         if (status < 0)
2557                 return status;
2558         spin_lock(&clp->cl_lock);
2559         if (time_before(clp->cl_last_renewal,now))
2560                 clp->cl_last_renewal = now;
2561         spin_unlock(&clp->cl_lock);
2562         return 0;
2563 }
2564
2565 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2566 {
2567         return (server->caps & NFS_CAP_ACLS)
2568                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2569                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2570 }
2571
2572 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2573  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2574  * the stack.
2575  */
2576 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2577
2578 static void buf_to_pages(const void *buf, size_t buflen,
2579                 struct page **pages, unsigned int *pgbase)
2580 {
2581         const void *p = buf;
2582
2583         *pgbase = offset_in_page(buf);
2584         p -= *pgbase;
2585         while (p < buf + buflen) {
2586                 *(pages++) = virt_to_page(p);
2587                 p += PAGE_CACHE_SIZE;
2588         }
2589 }
2590
2591 struct nfs4_cached_acl {
2592         int cached;
2593         size_t len;
2594         char data[0];
2595 };
2596
2597 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2598 {
2599         struct nfs_inode *nfsi = NFS_I(inode);
2600
2601         spin_lock(&inode->i_lock);
2602         kfree(nfsi->nfs4_acl);
2603         nfsi->nfs4_acl = acl;
2604         spin_unlock(&inode->i_lock);
2605 }
2606
2607 static void nfs4_zap_acl_attr(struct inode *inode)
2608 {
2609         nfs4_set_cached_acl(inode, NULL);
2610 }
2611
2612 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2613 {
2614         struct nfs_inode *nfsi = NFS_I(inode);
2615         struct nfs4_cached_acl *acl;
2616         int ret = -ENOENT;
2617
2618         spin_lock(&inode->i_lock);
2619         acl = nfsi->nfs4_acl;
2620         if (acl == NULL)
2621                 goto out;
2622         if (buf == NULL) /* user is just asking for length */
2623                 goto out_len;
2624         if (acl->cached == 0)
2625                 goto out;
2626         ret = -ERANGE; /* see getxattr(2) man page */
2627         if (acl->len > buflen)
2628                 goto out;
2629         memcpy(buf, acl->data, acl->len);
2630 out_len:
2631         ret = acl->len;
2632 out:
2633         spin_unlock(&inode->i_lock);
2634         return ret;
2635 }
2636
2637 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2638 {
2639         struct nfs4_cached_acl *acl;
2640
2641         if (buf && acl_len <= PAGE_SIZE) {
2642                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2643                 if (acl == NULL)
2644                         goto out;
2645                 acl->cached = 1;
2646                 memcpy(acl->data, buf, acl_len);
2647         } else {
2648                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2649                 if (acl == NULL)
2650                         goto out;
2651                 acl->cached = 0;
2652         }
2653         acl->len = acl_len;
2654 out:
2655         nfs4_set_cached_acl(inode, acl);
2656 }
2657
2658 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2659 {
2660         struct page *pages[NFS4ACL_MAXPAGES];
2661         struct nfs_getaclargs args = {
2662                 .fh = NFS_FH(inode),
2663                 .acl_pages = pages,
2664                 .acl_len = buflen,
2665         };
2666         size_t resp_len = buflen;
2667         void *resp_buf;
2668         struct rpc_message msg = {
2669                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2670                 .rpc_argp = &args,
2671                 .rpc_resp = &resp_len,
2672         };
2673         struct page *localpage = NULL;
2674         int ret;
2675
2676         if (buflen < PAGE_SIZE) {
2677                 /* As long as we're doing a round trip to the server anyway,
2678                  * let's be prepared for a page of acl data. */
2679                 localpage = alloc_page(GFP_KERNEL);
2680                 resp_buf = page_address(localpage);
2681                 if (localpage == NULL)
2682                         return -ENOMEM;
2683                 args.acl_pages[0] = localpage;
2684                 args.acl_pgbase = 0;
2685                 resp_len = args.acl_len = PAGE_SIZE;
2686         } else {
2687                 resp_buf = buf;
2688                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2689         }
2690         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2691         if (ret)
2692                 goto out_free;
2693         if (resp_len > args.acl_len)
2694                 nfs4_write_cached_acl(inode, NULL, resp_len);
2695         else
2696                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2697         if (buf) {
2698                 ret = -ERANGE;
2699                 if (resp_len > buflen)
2700                         goto out_free;
2701                 if (localpage)
2702                         memcpy(buf, resp_buf, resp_len);
2703         }
2704         ret = resp_len;
2705 out_free:
2706         if (localpage)
2707                 __free_page(localpage);
2708         return ret;
2709 }
2710
2711 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2712 {
2713         struct nfs4_exception exception = { };
2714         ssize_t ret;
2715         do {
2716                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2717                 if (ret >= 0)
2718                         break;
2719                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2720         } while (exception.retry);
2721         return ret;
2722 }
2723
2724 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2725 {
2726         struct nfs_server *server = NFS_SERVER(inode);
2727         int ret;
2728
2729         if (!nfs4_server_supports_acls(server))
2730                 return -EOPNOTSUPP;
2731         ret = nfs_revalidate_inode(server, inode);
2732         if (ret < 0)
2733                 return ret;
2734         ret = nfs4_read_cached_acl(inode, buf, buflen);
2735         if (ret != -ENOENT)
2736                 return ret;
2737         return nfs4_get_acl_uncached(inode, buf, buflen);
2738 }
2739
2740 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2741 {
2742         struct nfs_server *server = NFS_SERVER(inode);
2743         struct page *pages[NFS4ACL_MAXPAGES];
2744         struct nfs_setaclargs arg = {
2745                 .fh             = NFS_FH(inode),
2746                 .acl_pages      = pages,
2747                 .acl_len        = buflen,
2748         };
2749         struct rpc_message msg = {
2750                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2751                 .rpc_argp       = &arg,
2752                 .rpc_resp       = NULL,
2753         };
2754         int ret;
2755
2756         if (!nfs4_server_supports_acls(server))
2757                 return -EOPNOTSUPP;
2758         nfs_inode_return_delegation(inode);
2759         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2760         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2761         nfs_zap_caches(inode);
2762         return ret;
2763 }
2764
2765 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2766 {
2767         struct nfs4_exception exception = { };
2768         int err;
2769         do {
2770                 err = nfs4_handle_exception(NFS_SERVER(inode),
2771                                 __nfs4_proc_set_acl(inode, buf, buflen),
2772                                 &exception);
2773         } while (exception.retry);
2774         return err;
2775 }
2776
2777 static int
2778 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2779 {
2780         struct nfs_client *clp = server->nfs_client;
2781
2782         if (!clp || task->tk_status >= 0)
2783                 return 0;
2784         switch(task->tk_status) {
2785                 case -NFS4ERR_STALE_CLIENTID:
2786                 case -NFS4ERR_STALE_STATEID:
2787                 case -NFS4ERR_EXPIRED:
2788                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2789                         nfs4_schedule_state_recovery(clp);
2790                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2791                                 rpc_wake_up_task(task);
2792                         task->tk_status = 0;
2793                         return -EAGAIN;
2794                 case -NFS4ERR_DELAY:
2795                         nfs_inc_server_stats((struct nfs_server *) server,
2796                                                 NFSIOS_DELAY);
2797                 case -NFS4ERR_GRACE:
2798                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2799                         task->tk_status = 0;
2800                         return -EAGAIN;
2801                 case -NFS4ERR_OLD_STATEID:
2802                         task->tk_status = 0;
2803                         return -EAGAIN;
2804         }
2805         task->tk_status = nfs4_map_errors(task->tk_status);
2806         return 0;
2807 }
2808
2809 static int nfs4_wait_bit_interruptible(void *word)
2810 {
2811         if (signal_pending(current))
2812                 return -ERESTARTSYS;
2813         schedule();
2814         return 0;
2815 }
2816
2817 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2818 {
2819         sigset_t oldset;
2820         int res;
2821
2822         might_sleep();
2823
2824         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2825
2826         rpc_clnt_sigmask(clnt, &oldset);
2827         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2828                         nfs4_wait_bit_interruptible,
2829                         TASK_INTERRUPTIBLE);
2830         rpc_clnt_sigunmask(clnt, &oldset);
2831
2832         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2833         return res;
2834 }
2835
2836 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2837 {
2838         sigset_t oldset;
2839         int res = 0;
2840
2841         might_sleep();
2842
2843         if (*timeout <= 0)
2844                 *timeout = NFS4_POLL_RETRY_MIN;
2845         if (*timeout > NFS4_POLL_RETRY_MAX)
2846                 *timeout = NFS4_POLL_RETRY_MAX;
2847         rpc_clnt_sigmask(clnt, &oldset);
2848         if (clnt->cl_intr) {
2849                 schedule_timeout_interruptible(*timeout);
2850                 if (signalled())
2851                         res = -ERESTARTSYS;
2852         } else
2853                 schedule_timeout_uninterruptible(*timeout);
2854         rpc_clnt_sigunmask(clnt, &oldset);
2855         *timeout <<= 1;
2856         return res;
2857 }
2858
2859 /* This is the error handling routine for processes that are allowed
2860  * to sleep.
2861  */
2862 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2863 {
2864         struct nfs_client *clp = server->nfs_client;
2865         int ret = errorcode;
2866
2867         exception->retry = 0;
2868         switch(errorcode) {
2869                 case 0:
2870                         return 0;
2871                 case -NFS4ERR_STALE_CLIENTID:
2872                 case -NFS4ERR_STALE_STATEID:
2873                 case -NFS4ERR_EXPIRED:
2874                         nfs4_schedule_state_recovery(clp);
2875                         ret = nfs4_wait_clnt_recover(server->client, clp);
2876                         if (ret == 0)
2877                                 exception->retry = 1;
2878                         break;
2879                 case -NFS4ERR_FILE_OPEN:
2880                 case -NFS4ERR_GRACE:
2881                 case -NFS4ERR_DELAY:
2882                         ret = nfs4_delay(server->client, &exception->timeout);
2883                         if (ret != 0)
2884                                 break;
2885                 case -NFS4ERR_OLD_STATEID:
2886                         exception->retry = 1;
2887         }
2888         /* We failed to handle the error */
2889         return nfs4_map_errors(ret);
2890 }
2891
2892 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2893 {
2894         nfs4_verifier sc_verifier;
2895         struct nfs4_setclientid setclientid = {
2896                 .sc_verifier = &sc_verifier,
2897                 .sc_prog = program,
2898         };
2899         struct rpc_message msg = {
2900                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2901                 .rpc_argp = &setclientid,
2902                 .rpc_resp = clp,
2903                 .rpc_cred = cred,
2904         };
2905         __be32 *p;
2906         int loop = 0;
2907         int status;
2908
2909         p = (__be32*)sc_verifier.data;
2910         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2911         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2912
2913         for(;;) {
2914                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2915                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2916                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2917                                 cred->cr_ops->cr_name,
2918                                 clp->cl_id_uniquifier);
2919                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2920                                 sizeof(setclientid.sc_netid), "tcp");
2921                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2922                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2923                                 clp->cl_ipaddr, port >> 8, port & 255);
2924
2925                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2926                 if (status != -NFS4ERR_CLID_INUSE)
2927                         break;
2928                 if (signalled())
2929                         break;
2930                 if (loop++ & 1)
2931                         ssleep(clp->cl_lease_time + 1);
2932                 else
2933                         if (++clp->cl_id_uniquifier == 0)
2934                                 break;
2935         }
2936         return status;
2937 }
2938
2939 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2940 {
2941         struct nfs_fsinfo fsinfo;
2942         struct rpc_message msg = {
2943                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2944                 .rpc_argp = clp,
2945                 .rpc_resp = &fsinfo,
2946                 .rpc_cred = cred,
2947         };
2948         unsigned long now;
2949         int status;
2950
2951         now = jiffies;
2952         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2953         if (status == 0) {
2954                 spin_lock(&clp->cl_lock);
2955                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2956                 clp->cl_last_renewal = now;
2957                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2958                 spin_unlock(&clp->cl_lock);
2959         }
2960         return status;
2961 }
2962
2963 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2964 {
2965         long timeout;
2966         int err;
2967         do {
2968                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2969                 switch (err) {
2970                         case 0:
2971                                 return err;
2972                         case -NFS4ERR_RESOURCE:
2973                                 /* The IBM lawyers misread another document! */
2974                         case -NFS4ERR_DELAY:
2975                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2976                 }
2977         } while (err == 0);
2978         return err;
2979 }
2980
2981 struct nfs4_delegreturndata {
2982         struct nfs4_delegreturnargs args;
2983         struct nfs4_delegreturnres res;
2984         struct nfs_fh fh;
2985         nfs4_stateid stateid;
2986         struct rpc_cred *cred;
2987         unsigned long timestamp;
2988         struct nfs_fattr fattr;
2989         int rpc_status;
2990 };
2991
2992 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2993 {
2994         struct nfs4_delegreturndata *data = calldata;
2995         struct rpc_message msg = {
2996                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2997                 .rpc_argp = &data->args,
2998                 .rpc_resp = &data->res,
2999                 .rpc_cred = data->cred,
3000         };
3001         nfs_fattr_init(data->res.fattr);
3002         rpc_call_setup(task, &msg, 0);
3003 }
3004
3005 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3006 {
3007         struct nfs4_delegreturndata *data = calldata;
3008         data->rpc_status = task->tk_status;
3009         if (data->rpc_status == 0)
3010                 renew_lease(data->res.server, data->timestamp);
3011 }
3012
3013 static void nfs4_delegreturn_release(void *calldata)
3014 {
3015         struct nfs4_delegreturndata *data = calldata;
3016
3017         put_rpccred(data->cred);
3018         kfree(calldata);
3019 }
3020
3021 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3022         .rpc_call_prepare = nfs4_delegreturn_prepare,
3023         .rpc_call_done = nfs4_delegreturn_done,
3024         .rpc_release = nfs4_delegreturn_release,
3025 };
3026
3027 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3028 {
3029         struct nfs4_delegreturndata *data;
3030         struct nfs_server *server = NFS_SERVER(inode);
3031         struct rpc_task *task;
3032         int status;
3033
3034         data = kmalloc(sizeof(*data), GFP_KERNEL);
3035         if (data == NULL)
3036                 return -ENOMEM;
3037         data->args.fhandle = &data->fh;
3038         data->args.stateid = &data->stateid;
3039         data->args.bitmask = server->attr_bitmask;
3040         nfs_copy_fh(&data->fh, NFS_FH(inode));
3041         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3042         data->res.fattr = &data->fattr;
3043         data->res.server = server;
3044         data->cred = get_rpccred(cred);
3045         data->timestamp = jiffies;
3046         data->rpc_status = 0;
3047
3048         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3049         if (IS_ERR(task))
3050                 return PTR_ERR(task);
3051         status = nfs4_wait_for_completion_rpc_task(task);
3052         if (status == 0) {
3053                 status = data->rpc_status;
3054                 if (status == 0)
3055                         nfs_refresh_inode(inode, &data->fattr);
3056         }
3057         rpc_put_task(task);
3058         return status;
3059 }
3060
3061 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3062 {
3063         struct nfs_server *server = NFS_SERVER(inode);
3064         struct nfs4_exception exception = { };
3065         int err;
3066         do {
3067                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3068                 switch (err) {
3069                         case -NFS4ERR_STALE_STATEID:
3070                         case -NFS4ERR_EXPIRED:
3071                         case 0:
3072                                 return 0;
3073                 }
3074                 err = nfs4_handle_exception(server, err, &exception);
3075         } while (exception.retry);
3076         return err;
3077 }
3078
3079 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3080 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3081
3082 /*
3083  * sleep, with exponential backoff, and retry the LOCK operation.
3084  */
3085 static unsigned long
3086 nfs4_set_lock_task_retry(unsigned long timeout)
3087 {
3088         schedule_timeout_interruptible(timeout);
3089         timeout <<= 1;
3090         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3091                 return NFS4_LOCK_MAXTIMEOUT;
3092         return timeout;
3093 }
3094
3095 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3096 {
3097         struct inode *inode = state->inode;
3098         struct nfs_server *server = NFS_SERVER(inode);
3099         struct nfs_client *clp = server->nfs_client;
3100         struct nfs_lockt_args arg = {
3101                 .fh = NFS_FH(inode),
3102                 .fl = request,
3103         };
3104         struct nfs_lockt_res res = {
3105                 .denied = request,
3106         };
3107         struct rpc_message msg = {
3108                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3109                 .rpc_argp       = &arg,
3110                 .rpc_resp       = &res,
3111                 .rpc_cred       = state->owner->so_cred,
3112         };
3113         struct nfs4_lock_state *lsp;
3114         int status;
3115
3116         down_read(&clp->cl_sem);
3117         arg.lock_owner.clientid = clp->cl_clientid;
3118         status = nfs4_set_lock_state(state, request);
3119         if (status != 0)
3120                 goto out;
3121         lsp = request->fl_u.nfs4_fl.owner;
3122         arg.lock_owner.id = lsp->ls_id.id;
3123         status = rpc_call_sync(server->client, &msg, 0);
3124         switch (status) {
3125                 case 0:
3126                         request->fl_type = F_UNLCK;
3127                         break;
3128                 case -NFS4ERR_DENIED:
3129                         status = 0;
3130         }
3131         request->fl_ops->fl_release_private(request);
3132 out:
3133         up_read(&clp->cl_sem);
3134         return status;
3135 }
3136
3137 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3138 {
3139         struct nfs4_exception exception = { };
3140         int err;
3141
3142         do {
3143                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3144                                 _nfs4_proc_getlk(state, cmd, request),
3145                                 &exception);
3146         } while (exception.retry);
3147         return err;
3148 }
3149
3150 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3151 {
3152         int res = 0;
3153         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3154                 case FL_POSIX:
3155                         res = posix_lock_file_wait(file, fl);
3156                         break;
3157                 case FL_FLOCK:
3158                         res = flock_lock_file_wait(file, fl);
3159                         break;
3160                 default:
3161                         BUG();
3162         }
3163         return res;
3164 }
3165
3166 struct nfs4_unlockdata {
3167         struct nfs_locku_args arg;
3168         struct nfs_locku_res res;
3169         struct nfs4_lock_state *lsp;
3170         struct nfs_open_context *ctx;
3171         struct file_lock fl;
3172         const struct nfs_server *server;
3173         unsigned long timestamp;
3174 };
3175
3176 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3177                 struct nfs_open_context *ctx,
3178                 struct nfs4_lock_state *lsp,
3179                 struct nfs_seqid *seqid)
3180 {
3181         struct nfs4_unlockdata *p;
3182         struct inode *inode = lsp->ls_state->inode;
3183
3184         p = kmalloc(sizeof(*p), GFP_KERNEL);
3185         if (p == NULL)
3186                 return NULL;
3187         p->arg.fh = NFS_FH(inode);
3188         p->arg.fl = &p->fl;
3189         p->arg.seqid = seqid;
3190         p->arg.stateid = &lsp->ls_stateid;
3191         p->lsp = lsp;
3192         atomic_inc(&lsp->ls_count);
3193         /* Ensure we don't close file until we're done freeing locks! */
3194         p->ctx = get_nfs_open_context(ctx);
3195         memcpy(&p->fl, fl, sizeof(p->fl));
3196         p->server = NFS_SERVER(inode);
3197         return p;
3198 }
3199
3200 static void nfs4_locku_release_calldata(void *data)
3201 {
3202         struct nfs4_unlockdata *calldata = data;
3203         nfs_free_seqid(calldata->arg.seqid);
3204         nfs4_put_lock_state(calldata->lsp);
3205         put_nfs_open_context(calldata->ctx);
3206         kfree(calldata);
3207 }
3208
3209 static void nfs4_locku_done(struct rpc_task *task, void *data)
3210 {
3211         struct nfs4_unlockdata *calldata = data;
3212
3213         if (RPC_ASSASSINATED(task))
3214                 return;
3215         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3216         switch (task->tk_status) {
3217                 case 0:
3218                         memcpy(calldata->lsp->ls_stateid.data,
3219                                         calldata->res.stateid.data,
3220                                         sizeof(calldata->lsp->ls_stateid.data));
3221                         renew_lease(calldata->server, calldata->timestamp);
3222                         break;
3223                 case -NFS4ERR_STALE_STATEID:
3224                 case -NFS4ERR_EXPIRED:
3225                         break;
3226                 default:
3227                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3228                                 rpc_restart_call(task);
3229         }
3230 }
3231
3232 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3233 {
3234         struct nfs4_unlockdata *calldata = data;
3235         struct rpc_message msg = {
3236                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3237                 .rpc_argp       = &calldata->arg,
3238                 .rpc_resp       = &calldata->res,
3239                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3240         };
3241
3242         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3243                 return;
3244         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3245                 /* Note: exit _without_ running nfs4_locku_done */
3246                 task->tk_action = NULL;
3247                 return;
3248         }
3249         calldata->timestamp = jiffies;
3250         rpc_call_setup(task, &msg, 0);
3251 }
3252
3253 static const struct rpc_call_ops nfs4_locku_ops = {
3254         .rpc_call_prepare = nfs4_locku_prepare,
3255         .rpc_call_done = nfs4_locku_done,
3256         .rpc_release = nfs4_locku_release_calldata,
3257 };
3258
3259 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3260                 struct nfs_open_context *ctx,
3261                 struct nfs4_lock_state *lsp,
3262                 struct nfs_seqid *seqid)
3263 {
3264         struct nfs4_unlockdata *data;
3265
3266         /* Ensure this is an unlock - when canceling a lock, the
3267          * canceled lock is passed in, and it won't be an unlock.
3268          */
3269         fl->fl_type = F_UNLCK;
3270
3271         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3272         if (data == NULL) {
3273                 nfs_free_seqid(seqid);
3274                 return ERR_PTR(-ENOMEM);
3275         }
3276
3277         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3278 }
3279
3280 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3281 {
3282         struct nfs_seqid *seqid;
3283         struct nfs4_lock_state *lsp;
3284         struct rpc_task *task;
3285         int status = 0;
3286
3287         status = nfs4_set_lock_state(state, request);
3288         /* Unlock _before_ we do the RPC call */
3289         request->fl_flags |= FL_EXISTS;
3290         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3291                 goto out;
3292         if (status != 0)
3293                 goto out;
3294         /* Is this a delegated lock? */
3295         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3296                 goto out;
3297         lsp = request->fl_u.nfs4_fl.owner;
3298         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3299         status = -ENOMEM;
3300         if (seqid == NULL)
3301                 goto out;
3302         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3303         status = PTR_ERR(task);
3304         if (IS_ERR(task))
3305                 goto out;
3306         status = nfs4_wait_for_completion_rpc_task(task);
3307         rpc_put_task(task);
3308 out:
3309         return status;
3310 }
3311
3312 struct nfs4_lockdata {
3313         struct nfs_lock_args arg;
3314         struct nfs_lock_res res;
3315         struct nfs4_lock_state *lsp;
3316         struct nfs_open_context *ctx;
3317         struct file_lock fl;
3318         unsigned long timestamp;
3319         int rpc_status;
3320         int cancelled;
3321 };
3322
3323 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3324                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3325 {
3326         struct nfs4_lockdata *p;
3327         struct inode *inode = lsp->ls_state->inode;
3328         struct nfs_server *server = NFS_SERVER(inode);
3329
3330         p = kzalloc(sizeof(*p), GFP_KERNEL);
3331         if (p == NULL)
3332                 return NULL;
3333
3334         p->arg.fh = NFS_FH(inode);
3335         p->arg.fl = &p->fl;
3336         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3337         if (p->arg.lock_seqid == NULL)
3338                 goto out_free;
3339         p->arg.lock_stateid = &lsp->ls_stateid;
3340         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3341         p->arg.lock_owner.id = lsp->ls_id.id;
3342         p->lsp = lsp;
3343         atomic_inc(&lsp->ls_count);
3344         p->ctx = get_nfs_open_context(ctx);
3345         memcpy(&p->fl, fl, sizeof(p->fl));
3346         return p;
3347 out_free:
3348         kfree(p);
3349         return NULL;
3350 }
3351
3352 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3353 {
3354         struct nfs4_lockdata *data = calldata;
3355         struct nfs4_state *state = data->lsp->ls_state;
3356         struct nfs4_state_owner *sp = state->owner;
3357         struct rpc_message msg = {
3358                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3359                 .rpc_argp = &data->arg,
3360                 .rpc_resp = &data->res,
3361                 .rpc_cred = sp->so_cred,
3362         };
3363
3364         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3365                 return;
3366         dprintk("%s: begin!\n", __FUNCTION__);
3367         /* Do we need to do an open_to_lock_owner? */
3368         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3369                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3370                 if (data->arg.open_seqid == NULL) {
3371                         data->rpc_status = -ENOMEM;
3372                         task->tk_action = NULL;
3373                         goto out;
3374                 }
3375                 data->arg.open_stateid = &state->stateid;
3376                 data->arg.new_lock_owner = 1;
3377         }
3378         data->timestamp = jiffies;
3379         rpc_call_setup(task, &msg, 0);
3380 out:
3381         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3382 }
3383
3384 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3385 {
3386         struct nfs4_lockdata *data = calldata;
3387
3388         dprintk("%s: begin!\n", __FUNCTION__);
3389
3390         data->rpc_status = task->tk_status;
3391         if (RPC_ASSASSINATED(task))
3392                 goto out;
3393         if (data->arg.new_lock_owner != 0) {
3394                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3395                 if (data->rpc_status == 0)
3396                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3397                 else
3398                         goto out;
3399         }
3400         if (data->rpc_status == 0) {
3401                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3402                                         sizeof(data->lsp->ls_stateid.data));
3403                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3404                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3405         }
3406         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3407 out:
3408         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3409 }
3410
3411 static void nfs4_lock_release(void *calldata)
3412 {
3413         struct nfs4_lockdata *data = calldata;
3414
3415         dprintk("%s: begin!\n", __FUNCTION__);
3416         if (data->arg.open_seqid != NULL)
3417                 nfs_free_seqid(data->arg.open_seqid);
3418         if (data->cancelled != 0) {
3419                 struct rpc_task *task;
3420                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3421                                 data->arg.lock_seqid);
3422                 if (!IS_ERR(task))
3423                         rpc_put_task(task);
3424                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3425         } else
3426                 nfs_free_seqid(data->arg.lock_seqid);
3427         nfs4_put_lock_state(data->lsp);
3428         put_nfs_open_context(data->ctx);
3429         kfree(data);
3430         dprintk("%s: done!\n", __FUNCTION__);
3431 }
3432
3433 static const struct rpc_call_ops nfs4_lock_ops = {
3434         .rpc_call_prepare = nfs4_lock_prepare,
3435         .rpc_call_done = nfs4_lock_done,
3436         .rpc_release = nfs4_lock_release,
3437 };
3438
3439 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3440 {
3441         struct nfs4_lockdata *data;
3442         struct rpc_task *task;
3443         int ret;
3444
3445         dprintk("%s: begin!\n", __FUNCTION__);
3446         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3447                         fl->fl_u.nfs4_fl.owner);
3448         if (data == NULL)
3449                 return -ENOMEM;
3450         if (IS_SETLKW(cmd))
3451                 data->arg.block = 1;
3452         if (reclaim != 0)
3453                 data->arg.reclaim = 1;
3454         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3455                         &nfs4_lock_ops, data);
3456         if (IS_ERR(task))
3457                 return PTR_ERR(task);
3458         ret = nfs4_wait_for_completion_rpc_task(task);
3459         if (ret == 0) {
3460                 ret = data->rpc_status;
3461                 if (ret == -NFS4ERR_DENIED)
3462                         ret = -EAGAIN;
3463         } else
3464                 data->cancelled = 1;
3465         rpc_put_task(task);
3466         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3467         return ret;
3468 }
3469
3470 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3471 {
3472         struct nfs_server *server = NFS_SERVER(state->inode);
3473         struct nfs4_exception exception = { };
3474         int err;
3475
3476         do {
3477                 /* Cache the lock if possible... */
3478                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3479                         return 0;
3480                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3481                 if (err != -NFS4ERR_DELAY)
3482                         break;
3483                 nfs4_handle_exception(server, err, &exception);
3484         } while (exception.retry);
3485         return err;
3486 }
3487
3488 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3489 {
3490         struct nfs_server *server = NFS_SERVER(state->inode);
3491         struct nfs4_exception exception = { };
3492         int err;
3493
3494         err = nfs4_set_lock_state(state, request);
3495         if (err != 0)
3496                 return err;
3497         do {
3498                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3499                         return 0;
3500                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3501                 if (err != -NFS4ERR_DELAY)
3502                         break;
3503                 nfs4_handle_exception(server, err, &exception);
3504         } while (exception.retry);
3505         return err;
3506 }
3507
3508 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3509 {
3510         struct nfs_client *clp = state->owner->so_client;
3511         unsigned char fl_flags = request->fl_flags;
3512         int status;
3513
3514         /* Is this a delegated open? */
3515         status = nfs4_set_lock_state(state, request);
3516         if (status != 0)
3517                 goto out;
3518         request->fl_flags |= FL_ACCESS;
3519         status = do_vfs_lock(request->fl_file, request);
3520         if (status < 0)
3521                 goto out;
3522         down_read(&clp->cl_sem);
3523         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3524                 struct nfs_inode *nfsi = NFS_I(state->inode);
3525                 /* Yes: cache locks! */
3526                 down_read(&nfsi->rwsem);
3527                 /* ...but avoid races with delegation recall... */
3528                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3529                         request->fl_flags = fl_flags & ~FL_SLEEP;
3530                         status = do_vfs_lock(request->fl_file, request);
3531                         up_read(&nfsi->rwsem);
3532                         goto out_unlock;
3533                 }
3534                 up_read(&nfsi->rwsem);
3535         }
3536         status = _nfs4_do_setlk(state, cmd, request, 0);
3537         if (status != 0)
3538                 goto out_unlock;
3539         /* Note: we always want to sleep here! */
3540         request->fl_flags = fl_flags | FL_SLEEP;
3541         if (do_vfs_lock(request->fl_file, request) < 0)
3542                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3543 out_unlock:
3544         up_read(&clp->cl_sem);
3545 out:
3546         request->fl_flags = fl_flags;
3547         return status;
3548 }
3549
3550 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3551 {
3552         struct nfs4_exception exception = { };
3553         int err;
3554
3555         do {
3556                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3557                                 _nfs4_proc_setlk(state, cmd, request),
3558                                 &exception);
3559         } while (exception.retry);
3560         return err;
3561 }
3562
3563 static int
3564 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3565 {
3566         struct nfs_open_context *ctx;
3567         struct nfs4_state *state;
3568         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3569         int status;
3570
3571         /* verify open state */
3572         ctx = nfs_file_open_context(filp);
3573         state = ctx->state;
3574
3575         if (request->fl_start < 0 || request->fl_end < 0)
3576                 return -EINVAL;
3577
3578         if (IS_GETLK(cmd))
3579                 return nfs4_proc_getlk(state, F_GETLK, request);
3580
3581         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3582                 return -EINVAL;
3583
3584         if (request->fl_type == F_UNLCK)
3585                 return nfs4_proc_unlck(state, cmd, request);
3586
3587         do {
3588                 status = nfs4_proc_setlk(state, cmd, request);
3589                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3590                         break;
3591                 timeout = nfs4_set_lock_task_retry(timeout);
3592                 status = -ERESTARTSYS;
3593                 if (signalled())
3594                         break;
3595         } while(status < 0);
3596         return status;
3597 }
3598
3599 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3600 {
3601         struct nfs_server *server = NFS_SERVER(state->inode);
3602         struct nfs4_exception exception = { };
3603         int err;
3604
3605         err = nfs4_set_lock_state(state, fl);
3606         if (err != 0)
3607                 goto out;
3608         do {
3609                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3610                 if (err != -NFS4ERR_DELAY)
3611                         break;
3612                 err = nfs4_handle_exception(server, err, &exception);
3613         } while (exception.retry);
3614 out:
3615         return err;
3616 }
3617
3618 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3619
3620 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3621                 size_t buflen, int flags)
3622 {
3623         struct inode *inode = dentry->d_inode;
3624
3625         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3626                 return -EOPNOTSUPP;
3627
3628         if (!S_ISREG(inode->i_mode) &&
3629             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3630                 return -EPERM;
3631
3632         return nfs4_proc_set_acl(inode, buf, buflen);
3633 }
3634
3635 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3636  * and that's what we'll do for e.g. user attributes that haven't been set.
3637  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3638  * attributes in kernel-managed attribute namespaces. */
3639 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3640                 size_t buflen)
3641 {
3642         struct inode *inode = dentry->d_inode;
3643
3644         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3645                 return -EOPNOTSUPP;
3646
3647         return nfs4_proc_get_acl(inode, buf, buflen);
3648 }
3649
3650 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3651 {
3652         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3653
3654         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3655                 return 0;
3656         if (buf && buflen < len)
3657                 return -ERANGE;
3658         if (buf)
3659                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3660         return len;
3661 }
3662
3663 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3664                 struct nfs4_fs_locations *fs_locations, struct page *page)
3665 {
3666         struct nfs_server *server = NFS_SERVER(dir);
3667         u32 bitmask[2] = {
3668                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3669                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3670         };
3671         struct nfs4_fs_locations_arg args = {
3672                 .dir_fh = NFS_FH(dir),
3673                 .name = name,
3674                 .page = page,
3675                 .bitmask = bitmask,
3676         };
3677         struct rpc_message msg = {
3678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3679                 .rpc_argp = &args,
3680                 .rpc_resp = fs_locations,
3681         };
3682         int status;
3683
3684         dprintk("%s: start\n", __FUNCTION__);
3685         nfs_fattr_init(&fs_locations->fattr);
3686         fs_locations->server = server;
3687         fs_locations->nlocations = 0;
3688         status = rpc_call_sync(server->client, &msg, 0);
3689         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3690         return status;
3691 }
3692
3693 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3694         .recover_open   = nfs4_open_reclaim,
3695         .recover_lock   = nfs4_lock_reclaim,
3696 };
3697
3698 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3699         .recover_open   = nfs4_open_expired,
3700         .recover_lock   = nfs4_lock_expired,
3701 };
3702
3703 static const struct inode_operations nfs4_file_inode_operations = {
3704         .permission     = nfs_permission,
3705         .getattr        = nfs_getattr,
3706         .setattr        = nfs_setattr,
3707         .getxattr       = nfs4_getxattr,
3708         .setxattr       = nfs4_setxattr,
3709         .listxattr      = nfs4_listxattr,
3710 };
3711
3712 const struct nfs_rpc_ops nfs_v4_clientops = {
3713         .version        = 4,                    /* protocol version */
3714         .dentry_ops     = &nfs4_dentry_operations,
3715         .dir_inode_ops  = &nfs4_dir_inode_operations,
3716         .file_inode_ops = &nfs4_file_inode_operations,
3717         .getroot        = nfs4_proc_get_root,
3718         .getattr        = nfs4_proc_getattr,
3719         .setattr        = nfs4_proc_setattr,
3720         .lookupfh       = nfs4_proc_lookupfh,
3721         .lookup         = nfs4_proc_lookup,
3722         .access         = nfs4_proc_access,
3723         .readlink       = nfs4_proc_readlink,
3724         .create         = nfs4_proc_create,
3725         .remove         = nfs4_proc_remove,
3726         .unlink_setup   = nfs4_proc_unlink_setup,
3727         .unlink_done    = nfs4_proc_unlink_done,
3728         .rename         = nfs4_proc_rename,
3729         .link           = nfs4_proc_link,
3730         .symlink        = nfs4_proc_symlink,
3731         .mkdir          = nfs4_proc_mkdir,
3732         .rmdir          = nfs4_proc_remove,
3733         .readdir        = nfs4_proc_readdir,
3734         .mknod          = nfs4_proc_mknod,
3735         .statfs         = nfs4_proc_statfs,
3736         .fsinfo         = nfs4_proc_fsinfo,
3737         .pathconf       = nfs4_proc_pathconf,
3738         .set_capabilities = nfs4_server_capabilities,
3739         .decode_dirent  = nfs4_decode_dirent,
3740         .read_setup     = nfs4_proc_read_setup,
3741         .read_done      = nfs4_read_done,
3742         .write_setup    = nfs4_proc_write_setup,
3743         .write_done     = nfs4_write_done,
3744         .commit_setup   = nfs4_proc_commit_setup,
3745         .commit_done    = nfs4_commit_done,
3746         .file_open      = nfs_open,
3747         .file_release   = nfs_release,
3748         .lock           = nfs4_proc_lock,
3749         .clear_acl_cache = nfs4_zap_acl_attr,
3750 };
3751
3752 /*
3753  * Local variables:
3754  *  c-basic-offset: 8
3755  * End:
3756  */