git.oblomov.eu Git - linux-2.6/blob - 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_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags);
  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, dentry->d_inode->i_ino);
 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, dentry->d_parent->d_inode->i_ino);
 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->before == nfsi->change_attr && cinfo->atomic)
 213                 nfsi->change_attr = cinfo->after;
 214         spin_unlock(&dir->i_lock);
 215 }
 216
 217 struct nfs4_opendata {
 218         struct kref kref;
 219         struct nfs_openargs o_arg;
 220         struct nfs_openres o_res;
 221         struct nfs_open_confirmargs c_arg;
 222         struct nfs_open_confirmres c_res;
 223         struct nfs_fattr f_attr;
 224         struct nfs_fattr dir_attr;
 225         struct path path;
 226         struct dentry *dir;
 227         struct nfs4_state_owner *owner;
 228         struct nfs4_state *state;
 229         struct iattr attrs;
 230         unsigned long timestamp;
 231         unsigned int rpc_done : 1;
 232         int rpc_status;
 233         int cancelled;
 234 };
 235
 236
 237 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 238 {
 239         p->o_res.f_attr = &p->f_attr;
 240         p->o_res.dir_attr = &p->dir_attr;
 241         p->o_res.server = p->o_arg.server;
 242         nfs_fattr_init(&p->f_attr);
 243         nfs_fattr_init(&p->dir_attr);
 244 }
 245
 246 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 247                 struct nfs4_state_owner *sp, int flags,
 248                 const struct iattr *attrs)
 249 {
 250         struct dentry *parent = dget_parent(path->dentry);
 251         struct inode *dir = parent->d_inode;
 252         struct nfs_server *server = NFS_SERVER(dir);
 253         struct nfs4_opendata *p;
 254
 255         p = kzalloc(sizeof(*p), GFP_KERNEL);
 256         if (p == NULL)
 257                 goto err;
 258         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 259         if (p->o_arg.seqid == NULL)
 260                 goto err_free;
 261         p->path.mnt = mntget(path->mnt);
 262         p->path.dentry = dget(path->dentry);
 263         p->dir = parent;
 264         p->owner = sp;
 265         atomic_inc(&sp->so_count);
 266         p->o_arg.fh = NFS_FH(dir);
 267         p->o_arg.open_flags = flags,
 268         p->o_arg.clientid = server->nfs_client->cl_clientid;
 269         p->o_arg.id = sp->so_owner_id.id;
 270         p->o_arg.name = &p->path.dentry->d_name;
 271         p->o_arg.server = server;
 272         p->o_arg.bitmask = server->attr_bitmask;
 273         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 274         if (flags & O_EXCL) {
 275                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 276                 s[0] = jiffies;
 277                 s[1] = current->pid;
 278         } else if (flags & O_CREAT) {
 279                 p->o_arg.u.attrs = &p->attrs;
 280                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 281         }
 282         p->c_arg.fh = &p->o_res.fh;
 283         p->c_arg.stateid = &p->o_res.stateid;
 284         p->c_arg.seqid = p->o_arg.seqid;
 285         nfs4_init_opendata_res(p);
 286         kref_init(&p->kref);
 287         return p;
 288 err_free:
 289         kfree(p);
 290 err:
 291         dput(parent);
 292         return NULL;
 293 }
 294
 295 static void nfs4_opendata_free(struct kref *kref)
 296 {
 297         struct nfs4_opendata *p = container_of(kref,
 298                         struct nfs4_opendata, kref);
 299
 300         nfs_free_seqid(p->o_arg.seqid);
 301         if (p->state != NULL)
 302                 nfs4_put_open_state(p->state);
 303         nfs4_put_state_owner(p->owner);
 304         dput(p->dir);
 305         dput(p->path.dentry);
 306         mntput(p->path.mnt);
 307         kfree(p);
 308 }
 309
 310 static void nfs4_opendata_put(struct nfs4_opendata *p)
 311 {
 312         if (p != NULL)
 313                 kref_put(&p->kref, nfs4_opendata_free);
 314 }
 315
 316 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 317 {
 318         sigset_t oldset;
 319         int ret;
 320
 321         rpc_clnt_sigmask(task->tk_client, &oldset);
 322         ret = rpc_wait_for_completion_task(task);
 323         rpc_clnt_sigunmask(task->tk_client, &oldset);
 324         return ret;
 325 }
 326
 327 static int can_open_cached(struct nfs4_state *state, int mode)
 328 {
 329         int ret = 0;
 330         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 331                 case FMODE_READ:
 332                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 333                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 334                         break;
 335                 case FMODE_WRITE:
 336                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 337                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 338                         break;
 339                 case FMODE_READ|FMODE_WRITE:
 340                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 341         }
 342         return ret;
 343 }
 344
 345 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 346 {
 347         if ((delegation->type & open_flags) != open_flags)
 348                 return 0;
 349         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 350                 return 0;
 351         return 1;
 352 }
 353
 354 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 355 {
 356         switch (open_flags) {
 357                 case FMODE_WRITE:
 358                         state->n_wronly++;
 359                         break;
 360                 case FMODE_READ:
 361                         state->n_rdonly++;
 362                         break;
 363                 case FMODE_READ|FMODE_WRITE:
 364                         state->n_rdwr++;
 365         }
 366         nfs4_state_set_mode_locked(state, state->state | open_flags);
 367 }
 368
 369 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 370 {
 371         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 372                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 373         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 374         switch (open_flags) {
 375                 case FMODE_READ:
 376                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 377                         break;
 378                 case FMODE_WRITE:
 379                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 380                         break;
 381                 case FMODE_READ|FMODE_WRITE:
 382                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 383         }
 384 }
 385
 386 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 387 {
 388         write_seqlock(&state->seqlock);
 389         nfs_set_open_stateid_locked(state, stateid, open_flags);
 390         write_sequnlock(&state->seqlock);
 391 }
 392
 393 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 394 {
 395         open_flags &= (FMODE_READ|FMODE_WRITE);
 396         /*
 397          * Protect the call to nfs4_state_set_mode_locked and
 398          * serialise the stateid update
 399          */
 400         write_seqlock(&state->seqlock);
 401         if (deleg_stateid != NULL) {
 402                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 403                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 404         }
 405         if (open_stateid != NULL)
 406                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 407         write_sequnlock(&state->seqlock);
 408         spin_lock(&state->owner->so_lock);
 409         update_open_stateflags(state, open_flags);
 410         spin_unlock(&state->owner->so_lock);
 411 }
 412
 413 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 414 {
 415         struct nfs_delegation *delegation;
 416
 417         rcu_read_lock();
 418         delegation = rcu_dereference(NFS_I(inode)->delegation);
 419         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 420                 rcu_read_unlock();
 421                 return;
 422         }
 423         rcu_read_unlock();
 424         nfs_inode_return_delegation(inode);
 425 }
 426
 427 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 428 {
 429         struct nfs4_state *state = opendata->state;
 430         struct nfs_inode *nfsi = NFS_I(state->inode);
 431         struct nfs_delegation *delegation;
 432         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 433         nfs4_stateid stateid;
 434         int ret = -EAGAIN;
 435
 436         rcu_read_lock();
 437         delegation = rcu_dereference(nfsi->delegation);
 438         for (;;) {
 439                 if (can_open_cached(state, open_mode)) {
 440                         spin_lock(&state->owner->so_lock);
 441                         if (can_open_cached(state, open_mode)) {
 442                                 update_open_stateflags(state, open_mode);
 443                                 spin_unlock(&state->owner->so_lock);
 444                                 rcu_read_unlock();
 445                                 goto out_return_state;
 446                         }
 447                         spin_unlock(&state->owner->so_lock);
 448                 }
 449                 if (delegation == NULL)
 450                         break;
 451                 if (!can_open_delegated(delegation, open_mode))
 452                         break;
 453                 /* Save the delegation */
 454                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 455                 rcu_read_unlock();
 456                 lock_kernel();
 457                 ret = _nfs4_do_access(state->inode, state->owner->so_cred, open_mode);
 458                 unlock_kernel();
 459                 if (ret != 0)
 460                         goto out;
 461                 ret = -EAGAIN;
 462                 rcu_read_lock();
 463                 delegation = rcu_dereference(nfsi->delegation);
 464                 /* If no delegation, try a cached open */
 465                 if (delegation == NULL)
 466                         continue;
 467                 /* Is the delegation still valid? */
 468                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 469                         continue;
 470                 rcu_read_unlock();
 471                 update_open_stateid(state, NULL, &stateid, open_mode);
 472                 goto out_return_state;
 473         }
 474         rcu_read_unlock();
 475 out:
 476         return ERR_PTR(ret);
 477 out_return_state:
 478         atomic_inc(&state->count);
 479         return state;
 480 }
 481
 482 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 483 {
 484         struct inode *inode;
 485         struct nfs4_state *state = NULL;
 486         struct nfs_delegation *delegation;
 487         nfs4_stateid *deleg_stateid = NULL;
 488         int ret;
 489
 490         if (!data->rpc_done) {
 491                 state = nfs4_try_open_cached(data);
 492                 goto out;
 493         }
 494
 495         ret = -EAGAIN;
 496         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 497                 goto err;
 498         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 499         ret = PTR_ERR(inode);
 500         if (IS_ERR(inode))
 501                 goto err;
 502         ret = -ENOMEM;
 503         state = nfs4_get_open_state(inode, data->owner);
 504         if (state == NULL)
 505                 goto err_put_inode;
 506         if (data->o_res.delegation_type != 0) {
 507                 int delegation_flags = 0;
 508
 509                 rcu_read_lock();
 510                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 511                 if (delegation)
 512                         delegation_flags = delegation->flags;
 513                 rcu_read_unlock();
 514                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 515                         nfs_inode_set_delegation(state->inode,
 516                                         data->owner->so_cred,
 517                                         &data->o_res);
 518                 else
 519                         nfs_inode_reclaim_delegation(state->inode,
 520                                         data->owner->so_cred,
 521                                         &data->o_res);
 522         }
 523         rcu_read_lock();
 524         delegation = rcu_dereference(NFS_I(inode)->delegation);
 525         if (delegation != NULL)
 526                 deleg_stateid = &delegation->stateid;
 527         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 528         rcu_read_unlock();
 529         iput(inode);
 530 out:
 531         return state;
 532 err_put_inode:
 533         iput(inode);
 534 err:
 535         return ERR_PTR(ret);
 536 }
 537
 538 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 539 {
 540         struct nfs_inode *nfsi = NFS_I(state->inode);
 541         struct nfs_open_context *ctx;
 542
 543         spin_lock(&state->inode->i_lock);
 544         list_for_each_entry(ctx, &nfsi->open_files, list) {
 545                 if (ctx->state != state)
 546                         continue;
 547                 get_nfs_open_context(ctx);
 548                 spin_unlock(&state->inode->i_lock);
 549                 return ctx;
 550         }
 551         spin_unlock(&state->inode->i_lock);
 552         return ERR_PTR(-ENOENT);
 553 }
 554
 555 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 556 {
 557         struct nfs4_state *newstate;
 558         int ret;
 559
 560         opendata->o_arg.open_flags = openflags;
 561         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 562         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 563         nfs4_init_opendata_res(opendata);
 564         ret = _nfs4_proc_open(opendata);
 565         if (ret != 0)
 566                 return ret;
 567         newstate = nfs4_opendata_to_nfs4_state(opendata);
 568         if (IS_ERR(newstate))
 569                 return PTR_ERR(newstate);
 570         nfs4_close_state(&opendata->path, newstate, openflags);
 571         *res = newstate;
 572         return 0;
 573 }
 574
 575 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 576 {
 577         struct nfs4_state *newstate;
 578         int ret;
 579
 580         /* memory barrier prior to reading state->n_* */
 581         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 582         smp_rmb();
 583         if (state->n_rdwr != 0) {
 584                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 585                 if (ret != 0)
 586                         return ret;
 587                 if (newstate != state)
 588                         return -ESTALE;
 589         }
 590         if (state->n_wronly != 0) {
 591                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 592                 if (ret != 0)
 593                         return ret;
 594                 if (newstate != state)
 595                         return -ESTALE;
 596         }
 597         if (state->n_rdonly != 0) {
 598                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 599                 if (ret != 0)
 600                         return ret;
 601                 if (newstate != state)
 602                         return -ESTALE;
 603         }
 604         /*
 605          * We may have performed cached opens for all three recoveries.
 606          * Check if we need to update the current stateid.
 607          */
 608         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 609             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 610                 write_seqlock(&state->seqlock);
 611                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 612                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 613                 write_sequnlock(&state->seqlock);
 614         }
 615         return 0;
 616 }
 617
 618 /*
 619  * OPEN_RECLAIM:
 620  *      reclaim state on the server after a reboot.
 621  */
 622 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 623 {
 624         struct nfs_delegation *delegation;
 625         struct nfs4_opendata *opendata;
 626         int delegation_type = 0;
 627         int status;
 628
 629         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 630         if (opendata == NULL)
 631                 return -ENOMEM;
 632         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 633         opendata->o_arg.fh = NFS_FH(state->inode);
 634         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 635         rcu_read_lock();
 636         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 637         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 638                 delegation_type = delegation->flags;
 639         rcu_read_unlock();
 640         opendata->o_arg.u.delegation_type = delegation_type;
 641         status = nfs4_open_recover(opendata, state);
 642         nfs4_opendata_put(opendata);
 643         return status;
 644 }
 645
 646 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 647 {
 648         struct nfs_server *server = NFS_SERVER(state->inode);
 649         struct nfs4_exception exception = { };
 650         int err;
 651         do {
 652                 err = _nfs4_do_open_reclaim(ctx, state);
 653                 if (err != -NFS4ERR_DELAY)
 654                         break;
 655                 nfs4_handle_exception(server, err, &exception);
 656         } while (exception.retry);
 657         return err;
 658 }
 659
 660 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 661 {
 662         struct nfs_open_context *ctx;
 663         int ret;
 664
 665         ctx = nfs4_state_find_open_context(state);
 666         if (IS_ERR(ctx))
 667                 return PTR_ERR(ctx);
 668         ret = nfs4_do_open_reclaim(ctx, state);
 669         put_nfs_open_context(ctx);
 670         return ret;
 671 }
 672
 673 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 674 {
 675         struct nfs4_state_owner  *sp  = state->owner;
 676         struct nfs4_opendata *opendata;
 677         int ret;
 678
 679         opendata = nfs4_opendata_alloc(&ctx->path, sp, 0, NULL);
 680         if (opendata == NULL)
 681                 return -ENOMEM;
 682         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 683         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 684                         sizeof(opendata->o_arg.u.delegation.data));
 685         ret = nfs4_open_recover(opendata, state);
 686         nfs4_opendata_put(opendata);
 687         return ret;
 688 }
 689
 690 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 691 {
 692         struct nfs4_exception exception = { };
 693         struct nfs_server *server = NFS_SERVER(state->inode);
 694         int err;
 695         do {
 696                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 697                 switch (err) {
 698                         case 0:
 699                                 return err;
 700                         case -NFS4ERR_STALE_CLIENTID:
 701                         case -NFS4ERR_STALE_STATEID:
 702                         case -NFS4ERR_EXPIRED:
 703                                 /* Don't recall a delegation if it was lost */
 704                                 nfs4_schedule_state_recovery(server->nfs_client);
 705                                 return err;
 706                 }
 707                 err = nfs4_handle_exception(server, err, &exception);
 708         } while (exception.retry);
 709         return err;
 710 }
 711
 712 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 713 {
 714         struct nfs4_opendata *data = calldata;
 715         struct  rpc_message msg = {
 716                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 717                 .rpc_argp = &data->c_arg,
 718                 .rpc_resp = &data->c_res,
 719                 .rpc_cred = data->owner->so_cred,
 720         };
 721         data->timestamp = jiffies;
 722         rpc_call_setup(task, &msg, 0);
 723 }
 724
 725 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 726 {
 727         struct nfs4_opendata *data = calldata;
 728
 729         data->rpc_status = task->tk_status;
 730         if (RPC_ASSASSINATED(task))
 731                 return;
 732         if (data->rpc_status == 0) {
 733                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 734                                 sizeof(data->o_res.stateid.data));
 735                 renew_lease(data->o_res.server, data->timestamp);
 736                 data->rpc_done = 1;
 737         }
 738         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 739         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 740 }
 741
 742 static void nfs4_open_confirm_release(void *calldata)
 743 {
 744         struct nfs4_opendata *data = calldata;
 745         struct nfs4_state *state = NULL;
 746
 747         /* If this request hasn't been cancelled, do nothing */
 748         if (data->cancelled == 0)
 749                 goto out_free;
 750         /* In case of error, no cleanup! */
 751         if (!data->rpc_done)
 752                 goto out_free;
 753         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 754         state = nfs4_opendata_to_nfs4_state(data);
 755         if (!IS_ERR(state))
 756                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 757 out_free:
 758         nfs4_opendata_put(data);
 759 }
 760
 761 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 762         .rpc_call_prepare = nfs4_open_confirm_prepare,
 763         .rpc_call_done = nfs4_open_confirm_done,
 764         .rpc_release = nfs4_open_confirm_release,
 765 };
 766
 767 /*
 768  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 769  */
 770 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 771 {
 772         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 773         struct rpc_task *task;
 774         int status;
 775
 776         kref_get(&data->kref);
 777         data->rpc_done = 0;
 778         data->rpc_status = 0;
 779         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 780         if (IS_ERR(task))
 781                 return PTR_ERR(task);
 782         status = nfs4_wait_for_completion_rpc_task(task);
 783         if (status != 0) {
 784                 data->cancelled = 1;
 785                 smp_wmb();
 786         } else
 787                 status = data->rpc_status;
 788         rpc_put_task(task);
 789         return status;
 790 }
 791
 792 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 793 {
 794         struct nfs4_opendata *data = calldata;
 795         struct nfs4_state_owner *sp = data->owner;
 796         struct rpc_message msg = {
 797                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 798                 .rpc_argp = &data->o_arg,
 799                 .rpc_resp = &data->o_res,
 800                 .rpc_cred = sp->so_cred,
 801         };
 802
 803         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 804                 return;
 805         /*
 806          * Check if we still need to send an OPEN call, or if we can use
 807          * a delegation instead.
 808          */
 809         if (data->state != NULL) {
 810                 struct nfs_delegation *delegation;
 811
 812                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 813                         goto out_no_action;
 814                 rcu_read_lock();
 815                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 816                 if (delegation != NULL &&
 817                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 818                         rcu_read_unlock();
 819                         goto out_no_action;
 820                 }
 821                 rcu_read_unlock();
 822         }
 823         /* Update sequence id. */
 824         data->o_arg.id = sp->so_owner_id.id;
 825         data->o_arg.clientid = sp->so_client->cl_clientid;
 826         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 827                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 828         data->timestamp = jiffies;
 829         rpc_call_setup(task, &msg, 0);
 830         return;
 831 out_no_action:
 832         task->tk_action = NULL;
 833
 834 }
 835
 836 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 837 {
 838         struct nfs4_opendata *data = calldata;
 839
 840         data->rpc_status = task->tk_status;
 841         if (RPC_ASSASSINATED(task))
 842                 return;
 843         if (task->tk_status == 0) {
 844                 switch (data->o_res.f_attr->mode & S_IFMT) {
 845                         case S_IFREG:
 846                                 break;
 847                         case S_IFLNK:
 848                                 data->rpc_status = -ELOOP;
 849                                 break;
 850                         case S_IFDIR:
 851                                 data->rpc_status = -EISDIR;
 852                                 break;
 853                         default:
 854                                 data->rpc_status = -ENOTDIR;
 855                 }
 856                 renew_lease(data->o_res.server, data->timestamp);
 857                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 858                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 859         }
 860         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 861         data->rpc_done = 1;
 862 }
 863
 864 static void nfs4_open_release(void *calldata)
 865 {
 866         struct nfs4_opendata *data = calldata;
 867         struct nfs4_state *state = NULL;
 868
 869         /* If this request hasn't been cancelled, do nothing */
 870         if (data->cancelled == 0)
 871                 goto out_free;
 872         /* In case of error, no cleanup! */
 873         if (data->rpc_status != 0 || !data->rpc_done)
 874                 goto out_free;
 875         /* In case we need an open_confirm, no cleanup! */
 876         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 877                 goto out_free;
 878         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 879         state = nfs4_opendata_to_nfs4_state(data);
 880         if (!IS_ERR(state))
 881                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 882 out_free:
 883         nfs4_opendata_put(data);
 884 }
 885
 886 static const struct rpc_call_ops nfs4_open_ops = {
 887         .rpc_call_prepare = nfs4_open_prepare,
 888         .rpc_call_done = nfs4_open_done,
 889         .rpc_release = nfs4_open_release,
 890 };
 891
 892 /*
 893  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 894  */
 895 static int _nfs4_proc_open(struct nfs4_opendata *data)
 896 {
 897         struct inode *dir = data->dir->d_inode;
 898         struct nfs_server *server = NFS_SERVER(dir);
 899         struct nfs_openargs *o_arg = &data->o_arg;
 900         struct nfs_openres *o_res = &data->o_res;
 901         struct rpc_task *task;
 902         int status;
 903
 904         kref_get(&data->kref);
 905         data->rpc_done = 0;
 906         data->rpc_status = 0;
 907         data->cancelled = 0;
 908         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 909         if (IS_ERR(task))
 910                 return PTR_ERR(task);
 911         status = nfs4_wait_for_completion_rpc_task(task);
 912         if (status != 0) {
 913                 data->cancelled = 1;
 914                 smp_wmb();
 915         } else
 916                 status = data->rpc_status;
 917         rpc_put_task(task);
 918         if (status != 0 || !data->rpc_done)
 919                 return status;
 920
 921         if (o_arg->open_flags & O_CREAT) {
 922                 update_changeattr(dir, &o_res->cinfo);
 923                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 924         } else
 925                 nfs_refresh_inode(dir, o_res->dir_attr);
 926         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 927                 status = _nfs4_proc_open_confirm(data);
 928                 if (status != 0)
 929                         return status;
 930         }
 931         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 932                 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 933         return 0;
 934 }
 935
 936 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 937 {
 938         struct nfs_access_entry cache;
 939         int mask = 0;
 940         int status;
 941
 942         if (openflags & FMODE_READ)
 943                 mask |= MAY_READ;
 944         if (openflags & FMODE_WRITE)
 945                 mask |= MAY_WRITE;
 946         if (openflags & FMODE_EXEC)
 947                 mask |= MAY_EXEC;
 948         status = nfs_access_get_cached(inode, cred, &cache);
 949         if (status == 0)
 950                 goto out;
 951
 952         /* Be clever: ask server to check for all possible rights */
 953         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 954         cache.cred = cred;
 955         cache.jiffies = jiffies;
 956         status = _nfs4_proc_access(inode, &cache);
 957         if (status != 0)
 958                 return status;
 959         nfs_access_add_cache(inode, &cache);
 960 out:
 961         if ((cache.mask & mask) == mask)
 962                 return 0;
 963         return -EACCES;
 964 }
 965
 966 static int nfs4_recover_expired_lease(struct nfs_server *server)
 967 {
 968         struct nfs_client *clp = server->nfs_client;
 969         int ret;
 970
 971         for (;;) {
 972                 ret = nfs4_wait_clnt_recover(server->client, clp);
 973                 if (ret != 0)
 974                         return ret;
 975                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 976                         break;
 977                 nfs4_schedule_state_recovery(clp);
 978         }
 979         return 0;
 980 }
 981
 982 /*
 983  * OPEN_EXPIRED:
 984  *      reclaim state on the server after a network partition.
 985  *      Assumes caller holds the appropriate lock
 986  */
 987 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 988 {
 989         struct nfs4_opendata *opendata;
 990         int ret;
 991
 992         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 993         if (opendata == NULL)
 994                 return -ENOMEM;
 995         ret = nfs4_open_recover(opendata, state);
 996         if (ret == -ESTALE) {
 997                 /* Invalidate the state owner so we don't ever use it again */
 998                 nfs4_drop_state_owner(state->owner);
 999                 d_drop(ctx->path.dentry);
1000         }
1001         nfs4_opendata_put(opendata);
1002         return ret;
1003 }
1004
1005 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1006 {
1007         struct nfs_server *server = NFS_SERVER(state->inode);
1008         struct nfs4_exception exception = { };
1009         int err;
1010
1011         do {
1012                 err = _nfs4_open_expired(ctx, state);
1013                 if (err == -NFS4ERR_DELAY)
1014                         nfs4_handle_exception(server, err, &exception);
1015         } while (exception.retry);
1016         return err;
1017 }
1018
1019 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1020 {
1021         struct nfs_open_context *ctx;
1022         int ret;
1023
1024         ctx = nfs4_state_find_open_context(state);
1025         if (IS_ERR(ctx))
1026                 return PTR_ERR(ctx);
1027         ret = nfs4_do_open_expired(ctx, state);
1028         put_nfs_open_context(ctx);
1029         return ret;
1030 }
1031
1032 /*
1033  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1034  * fields corresponding to attributes that were used to store the verifier.
1035  * Make sure we clobber those fields in the later setattr call
1036  */
1037 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1038 {
1039         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1040             !(sattr->ia_valid & ATTR_ATIME_SET))
1041                 sattr->ia_valid |= ATTR_ATIME;
1042
1043         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1044             !(sattr->ia_valid & ATTR_MTIME_SET))
1045                 sattr->ia_valid |= ATTR_MTIME;
1046 }
1047
1048 /*
1049  * Returns a referenced nfs4_state
1050  */
1051 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1052 {
1053         struct nfs4_state_owner  *sp;
1054         struct nfs4_state     *state = NULL;
1055         struct nfs_server       *server = NFS_SERVER(dir);
1056         struct nfs_client *clp = server->nfs_client;
1057         struct nfs4_opendata *opendata;
1058         int status;
1059
1060         /* Protect against reboot recovery conflicts */
1061         status = -ENOMEM;
1062         if (!(sp = nfs4_get_state_owner(server, cred))) {
1063                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1064                 goto out_err;
1065         }
1066         status = nfs4_recover_expired_lease(server);
1067         if (status != 0)
1068                 goto err_put_state_owner;
1069         if (path->dentry->d_inode != NULL)
1070                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1071         down_read(&clp->cl_sem);
1072         status = -ENOMEM;
1073         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1074         if (opendata == NULL)
1075                 goto err_release_rwsem;
1076
1077         if (path->dentry->d_inode != NULL)
1078                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1079
1080         status = _nfs4_proc_open(opendata);
1081         if (status != 0)
1082                 goto err_opendata_put;
1083
1084         if (opendata->o_arg.open_flags & O_EXCL)
1085                 nfs4_exclusive_attrset(opendata, sattr);
1086
1087         state = nfs4_opendata_to_nfs4_state(opendata);
1088         status = PTR_ERR(state);
1089         if (IS_ERR(state))
1090                 goto err_opendata_put;
1091         nfs4_opendata_put(opendata);
1092         nfs4_put_state_owner(sp);
1093         up_read(&clp->cl_sem);
1094         *res = state;
1095         return 0;
1096 err_opendata_put:
1097         nfs4_opendata_put(opendata);
1098 err_release_rwsem:
1099         up_read(&clp->cl_sem);
1100 err_put_state_owner:
1101         nfs4_put_state_owner(sp);
1102 out_err:
1103         *res = NULL;
1104         return status;
1105 }
1106
1107
1108 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1109 {
1110         struct nfs4_exception exception = { };
1111         struct nfs4_state *res;
1112         int status;
1113
1114         do {
1115                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1116                 if (status == 0)
1117                         break;
1118                 /* NOTE: BAD_SEQID means the server and client disagree about the
1119                  * book-keeping w.r.t. state-changing operations
1120                  * (OPEN/CLOSE/LOCK/LOCKU...)
1121                  * It is actually a sign of a bug on the client or on the server.
1122                  *
1123                  * If we receive a BAD_SEQID error in the particular case of
1124                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1125                  * have unhashed the old state_owner for us, and that we can
1126                  * therefore safely retry using a new one. We should still warn
1127                  * the user though...
1128                  */
1129                 if (status == -NFS4ERR_BAD_SEQID) {
1130                         printk(KERN_WARNING "NFS: v4 server %s "
1131                                         " returned a bad sequence-id error!\n",
1132                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1133                         exception.retry = 1;
1134                         continue;
1135                 }
1136                 /*
1137                  * BAD_STATEID on OPEN means that the server cancelled our
1138                  * state before it received the OPEN_CONFIRM.
1139                  * Recover by retrying the request as per the discussion
1140                  * on Page 181 of RFC3530.
1141                  */
1142                 if (status == -NFS4ERR_BAD_STATEID) {
1143                         exception.retry = 1;
1144                         continue;
1145                 }
1146                 if (status == -EAGAIN) {
1147                         /* We must have found a delegation */
1148                         exception.retry = 1;
1149                         continue;
1150                 }
1151                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1152                                         status, &exception));
1153         } while (exception.retry);
1154         return res;
1155 }
1156
1157 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1158                 struct iattr *sattr, struct nfs4_state *state)
1159 {
1160         struct nfs_server *server = NFS_SERVER(inode);
1161         struct nfs_setattrargs  arg = {
1162                 .fh             = NFS_FH(inode),
1163                 .iap            = sattr,
1164                 .server         = server,
1165                 .bitmask = server->attr_bitmask,
1166         };
1167         struct nfs_setattrres  res = {
1168                 .fattr          = fattr,
1169                 .server         = server,
1170         };
1171         struct rpc_message msg = {
1172                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1173                 .rpc_argp       = &arg,
1174                 .rpc_resp       = &res,
1175         };
1176         unsigned long timestamp = jiffies;
1177         int status;
1178
1179         nfs_fattr_init(fattr);
1180
1181         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1182                 /* Use that stateid */
1183         } else if (state != NULL) {
1184                 msg.rpc_cred = state->owner->so_cred;
1185                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1186         } else
1187                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1188
1189         status = rpc_call_sync(server->client, &msg, 0);
1190         if (status == 0 && state != NULL)
1191                 renew_lease(server, timestamp);
1192         return status;
1193 }
1194
1195 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1196                 struct iattr *sattr, struct nfs4_state *state)
1197 {
1198         struct nfs_server *server = NFS_SERVER(inode);
1199         struct nfs4_exception exception = { };
1200         int err;
1201         do {
1202                 err = nfs4_handle_exception(server,
1203                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1204                                 &exception);
1205         } while (exception.retry);
1206         return err;
1207 }
1208
1209 struct nfs4_closedata {
1210         struct path path;
1211         struct inode *inode;
1212         struct nfs4_state *state;
1213         struct nfs_closeargs arg;
1214         struct nfs_closeres res;
1215         struct nfs_fattr fattr;
1216         unsigned long timestamp;
1217 };
1218
1219 static void nfs4_free_closedata(void *data)
1220 {
1221         struct nfs4_closedata *calldata = data;
1222         struct nfs4_state_owner *sp = calldata->state->owner;
1223
1224         nfs4_put_open_state(calldata->state);
1225         nfs_free_seqid(calldata->arg.seqid);
1226         nfs4_put_state_owner(sp);
1227         dput(calldata->path.dentry);
1228         mntput(calldata->path.mnt);
1229         kfree(calldata);
1230 }
1231
1232 static void nfs4_close_done(struct rpc_task *task, void *data)
1233 {
1234         struct nfs4_closedata *calldata = data;
1235         struct nfs4_state *state = calldata->state;
1236         struct nfs_server *server = NFS_SERVER(calldata->inode);
1237
1238         if (RPC_ASSASSINATED(task))
1239                 return;
1240         /* hmm. we are done with the inode, and in the process of freeing
1241          * the state_owner. we keep this around to process errors
1242          */
1243         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1244         switch (task->tk_status) {
1245                 case 0:
1246                         nfs_set_open_stateid(state, &calldata->res.stateid, calldata->arg.open_flags);
1247                         renew_lease(server, calldata->timestamp);
1248                         break;
1249                 case -NFS4ERR_STALE_STATEID:
1250                 case -NFS4ERR_EXPIRED:
1251                         break;
1252                 default:
1253                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1254                                 rpc_restart_call(task);
1255                                 return;
1256                         }
1257         }
1258         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1259 }
1260
1261 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1262 {
1263         struct nfs4_closedata *calldata = data;
1264         struct nfs4_state *state = calldata->state;
1265         struct rpc_message msg = {
1266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1267                 .rpc_argp = &calldata->arg,
1268                 .rpc_resp = &calldata->res,
1269                 .rpc_cred = state->owner->so_cred,
1270         };
1271         int clear_rd, clear_wr, clear_rdwr;
1272         int mode;
1273
1274         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1275                 return;
1276
1277         mode = FMODE_READ|FMODE_WRITE;
1278         clear_rd = clear_wr = clear_rdwr = 0;
1279         spin_lock(&state->owner->so_lock);
1280         /* Calculate the change in open mode */
1281         if (state->n_rdwr == 0) {
1282                 if (state->n_rdonly == 0) {
1283                         mode &= ~FMODE_READ;
1284                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1285                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1286                 }
1287                 if (state->n_wronly == 0) {
1288                         mode &= ~FMODE_WRITE;
1289                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1290                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1291                 }
1292         }
1293         spin_unlock(&state->owner->so_lock);
1294         if (!clear_rd && !clear_wr && !clear_rdwr) {
1295                 /* Note: exit _without_ calling nfs4_close_done */
1296                 task->tk_action = NULL;
1297                 return;
1298         }
1299         nfs_fattr_init(calldata->res.fattr);
1300         if (mode != 0)
1301                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1302         calldata->arg.open_flags = mode;
1303         calldata->timestamp = jiffies;
1304         rpc_call_setup(task, &msg, 0);
1305 }
1306
1307 static const struct rpc_call_ops nfs4_close_ops = {
1308         .rpc_call_prepare = nfs4_close_prepare,
1309         .rpc_call_done = nfs4_close_done,
1310         .rpc_release = nfs4_free_closedata,
1311 };
1312
1313 /*
1314  * It is possible for data to be read/written from a mem-mapped file
1315  * after the sys_close call (which hits the vfs layer as a flush).
1316  * This means that we can't safely call nfsv4 close on a file until
1317  * the inode is cleared. This in turn means that we are not good
1318  * NFSv4 citizens - we do not indicate to the server to update the file's
1319  * share state even when we are done with one of the three share
1320  * stateid's in the inode.
1321  *
1322  * NOTE: Caller must be holding the sp->so_owner semaphore!
1323  */
1324 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1325 {
1326         struct nfs_server *server = NFS_SERVER(state->inode);
1327         struct nfs4_closedata *calldata;
1328         struct nfs4_state_owner *sp = state->owner;
1329         struct rpc_task *task;
1330         int status = -ENOMEM;
1331
1332         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1333         if (calldata == NULL)
1334                 goto out;
1335         calldata->inode = state->inode;
1336         calldata->state = state;
1337         calldata->arg.fh = NFS_FH(state->inode);
1338         calldata->arg.stateid = &state->open_stateid;
1339         /* Serialization for the sequence id */
1340         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1341         if (calldata->arg.seqid == NULL)
1342                 goto out_free_calldata;
1343         calldata->arg.bitmask = server->attr_bitmask;
1344         calldata->res.fattr = &calldata->fattr;
1345         calldata->res.server = server;
1346         calldata->path.mnt = mntget(path->mnt);
1347         calldata->path.dentry = dget(path->dentry);
1348
1349         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1350         if (IS_ERR(task))
1351                 return PTR_ERR(task);
1352         rpc_put_task(task);
1353         return 0;
1354 out_free_calldata:
1355         kfree(calldata);
1356 out:
1357         nfs4_put_open_state(state);
1358         nfs4_put_state_owner(sp);
1359         return status;
1360 }
1361
1362 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1363 {
1364         struct file *filp;
1365         int ret;
1366
1367         /* If the open_intent is for execute, we have an extra check to make */
1368         if (nd->intent.open.flags & FMODE_EXEC) {
1369                 ret = _nfs4_do_access(state->inode,
1370                                 state->owner->so_cred,
1371                                 nd->intent.open.flags);
1372                 if (ret < 0)
1373                         goto out_close;
1374         }
1375         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1376         if (!IS_ERR(filp)) {
1377                 struct nfs_open_context *ctx;
1378                 ctx = (struct nfs_open_context *)filp->private_data;
1379                 ctx->state = state;
1380                 return 0;
1381         }
1382         ret = PTR_ERR(filp);
1383 out_close:
1384         nfs4_close_state(path, state, nd->intent.open.flags);
1385         return ret;
1386 }
1387
1388 struct dentry *
1389 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1390 {
1391         struct path path = {
1392                 .mnt = nd->mnt,
1393                 .dentry = dentry,
1394         };
1395         struct iattr attr;
1396         struct rpc_cred *cred;
1397         struct nfs4_state *state;
1398         struct dentry *res;
1399
1400         if (nd->flags & LOOKUP_CREATE) {
1401                 attr.ia_mode = nd->intent.open.create_mode;
1402                 attr.ia_valid = ATTR_MODE;
1403                 if (!IS_POSIXACL(dir))
1404                         attr.ia_mode &= ~current->fs->umask;
1405         } else {
1406                 attr.ia_valid = 0;
1407                 BUG_ON(nd->intent.open.flags & O_CREAT);
1408         }
1409
1410         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1411         if (IS_ERR(cred))
1412                 return (struct dentry *)cred;
1413         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1414         put_rpccred(cred);
1415         if (IS_ERR(state)) {
1416                 if (PTR_ERR(state) == -ENOENT)
1417                         d_add(dentry, NULL);
1418                 return (struct dentry *)state;
1419         }
1420         res = d_add_unique(dentry, igrab(state->inode));
1421         if (res != NULL)
1422                 dentry = res;
1423         nfs4_intent_set_file(nd, &path, state);
1424         return res;
1425 }
1426
1427 int
1428 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1429 {
1430         struct path path = {
1431                 .mnt = nd->mnt,
1432                 .dentry = dentry,
1433         };
1434         struct rpc_cred *cred;
1435         struct nfs4_state *state;
1436
1437         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1438         if (IS_ERR(cred))
1439                 return PTR_ERR(cred);
1440         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1441         put_rpccred(cred);
1442         if (IS_ERR(state)) {
1443                 switch (PTR_ERR(state)) {
1444                         case -EPERM:
1445                         case -EACCES:
1446                         case -EDQUOT:
1447                         case -ENOSPC:
1448                         case -EROFS:
1449                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1450                                 return 1;
1451                         default:
1452                                 goto out_drop;
1453                 }
1454         }
1455         if (state->inode == dentry->d_inode) {
1456                 nfs4_intent_set_file(nd, &path, state);
1457                 return 1;
1458         }
1459         nfs4_close_state(&path, state, openflags);
1460 out_drop:
1461         d_drop(dentry);
1462         return 0;
1463 }
1464
1465
1466 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1467 {
1468         struct nfs4_server_caps_res res = {};
1469         struct rpc_message msg = {
1470                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1471                 .rpc_argp = fhandle,
1472                 .rpc_resp = &res,
1473         };
1474         int status;
1475
1476         status = rpc_call_sync(server->client, &msg, 0);
1477         if (status == 0) {
1478                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1479                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1480                         server->caps |= NFS_CAP_ACLS;
1481                 if (res.has_links != 0)
1482                         server->caps |= NFS_CAP_HARDLINKS;
1483                 if (res.has_symlinks != 0)
1484                         server->caps |= NFS_CAP_SYMLINKS;
1485                 server->acl_bitmask = res.acl_bitmask;
1486         }
1487         return status;
1488 }
1489
1490 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1491 {
1492         struct nfs4_exception exception = { };
1493         int err;
1494         do {
1495                 err = nfs4_handle_exception(server,
1496                                 _nfs4_server_capabilities(server, fhandle),
1497                                 &exception);
1498         } while (exception.retry);
1499         return err;
1500 }
1501
1502 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1503                 struct nfs_fsinfo *info)
1504 {
1505         struct nfs4_lookup_root_arg args = {
1506                 .bitmask = nfs4_fattr_bitmap,
1507         };
1508         struct nfs4_lookup_res res = {
1509                 .server = server,
1510                 .fattr = info->fattr,
1511                 .fh = fhandle,
1512         };
1513         struct rpc_message msg = {
1514                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1515                 .rpc_argp = &args,
1516                 .rpc_resp = &res,
1517         };
1518         nfs_fattr_init(info->fattr);
1519         return rpc_call_sync(server->client, &msg, 0);
1520 }
1521
1522 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1523                 struct nfs_fsinfo *info)
1524 {
1525         struct nfs4_exception exception = { };
1526         int err;
1527         do {
1528                 err = nfs4_handle_exception(server,
1529                                 _nfs4_lookup_root(server, fhandle, info),
1530                                 &exception);
1531         } while (exception.retry);
1532         return err;
1533 }
1534
1535 /*
1536  * get the file handle for the "/" directory on the server
1537  */
1538 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1539                               struct nfs_fsinfo *info)
1540 {
1541         int status;
1542
1543         status = nfs4_lookup_root(server, fhandle, info);
1544         if (status == 0)
1545                 status = nfs4_server_capabilities(server, fhandle);
1546         if (status == 0)
1547                 status = nfs4_do_fsinfo(server, fhandle, info);
1548         return nfs4_map_errors(status);
1549 }
1550
1551 /*
1552  * Get locations and (maybe) other attributes of a referral.
1553  * Note that we'll actually follow the referral later when
1554  * we detect fsid mismatch in inode revalidation
1555  */
1556 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1557 {
1558         int status = -ENOMEM;
1559         struct page *page = NULL;
1560         struct nfs4_fs_locations *locations = NULL;
1561
1562         page = alloc_page(GFP_KERNEL);
1563         if (page == NULL)
1564                 goto out;
1565         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1566         if (locations == NULL)
1567                 goto out;
1568
1569         status = nfs4_proc_fs_locations(dir, name, locations, page);
1570         if (status != 0)
1571                 goto out;
1572         /* Make sure server returned a different fsid for the referral */
1573         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1574                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1575                 status = -EIO;
1576                 goto out;
1577         }
1578
1579         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1580         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1581         if (!fattr->mode)
1582                 fattr->mode = S_IFDIR;
1583         memset(fhandle, 0, sizeof(struct nfs_fh));
1584 out:
1585         if (page)
1586                 __free_page(page);
1587         if (locations)
1588                 kfree(locations);
1589         return status;
1590 }
1591
1592 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1593 {
1594         struct nfs4_getattr_arg args = {
1595                 .fh = fhandle,
1596                 .bitmask = server->attr_bitmask,
1597         };
1598         struct nfs4_getattr_res res = {
1599                 .fattr = fattr,
1600                 .server = server,
1601         };
1602         struct rpc_message msg = {
1603                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1604                 .rpc_argp = &args,
1605                 .rpc_resp = &res,
1606         };
1607
1608         nfs_fattr_init(fattr);
1609         return rpc_call_sync(server->client, &msg, 0);
1610 }
1611
1612 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1613 {
1614         struct nfs4_exception exception = { };
1615         int err;
1616         do {
1617                 err = nfs4_handle_exception(server,
1618                                 _nfs4_proc_getattr(server, fhandle, fattr),
1619                                 &exception);
1620         } while (exception.retry);
1621         return err;
1622 }
1623
1624 /*
1625  * The file is not closed if it is opened due to the a request to change
1626  * the size of the file. The open call will not be needed once the
1627  * VFS layer lookup-intents are implemented.
1628  *
1629  * Close is called when the inode is destroyed.
1630  * If we haven't opened the file for O_WRONLY, we
1631  * need to in the size_change case to obtain a stateid.
1632  *
1633  * Got race?
1634  * Because OPEN is always done by name in nfsv4, it is
1635  * possible that we opened a different file by the same
1636  * name.  We can recognize this race condition, but we
1637  * can't do anything about it besides returning an error.
1638  *
1639  * This will be fixed with VFS changes (lookup-intent).
1640  */
1641 static int
1642 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1643                   struct iattr *sattr)
1644 {
1645         struct rpc_cred *cred;
1646         struct inode *inode = dentry->d_inode;
1647         struct nfs_open_context *ctx;
1648         struct nfs4_state *state = NULL;
1649         int status;
1650
1651         nfs_fattr_init(fattr);
1652
1653         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1654         if (IS_ERR(cred))
1655                 return PTR_ERR(cred);
1656
1657         /* Search for an existing open(O_WRITE) file */
1658         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1659         if (ctx != NULL)
1660                 state = ctx->state;
1661
1662         status = nfs4_do_setattr(inode, fattr, sattr, state);
1663         if (status == 0)
1664                 nfs_setattr_update_inode(inode, sattr);
1665         if (ctx != NULL)
1666                 put_nfs_open_context(ctx);
1667         put_rpccred(cred);
1668         return status;
1669 }
1670
1671 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1672                 struct qstr *name, struct nfs_fh *fhandle,
1673                 struct nfs_fattr *fattr)
1674 {
1675         int                    status;
1676         struct nfs4_lookup_arg args = {
1677                 .bitmask = server->attr_bitmask,
1678                 .dir_fh = dirfh,
1679                 .name = name,
1680         };
1681         struct nfs4_lookup_res res = {
1682                 .server = server,
1683                 .fattr = fattr,
1684                 .fh = fhandle,
1685         };
1686         struct rpc_message msg = {
1687                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1688                 .rpc_argp = &args,
1689                 .rpc_resp = &res,
1690         };
1691
1692         nfs_fattr_init(fattr);
1693
1694         dprintk("NFS call  lookupfh %s\n", name->name);
1695         status = rpc_call_sync(server->client, &msg, 0);
1696         dprintk("NFS reply lookupfh: %d\n", status);
1697         return status;
1698 }
1699
1700 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1701                               struct qstr *name, struct nfs_fh *fhandle,
1702                               struct nfs_fattr *fattr)
1703 {
1704         struct nfs4_exception exception = { };
1705         int err;
1706         do {
1707                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1708                 /* FIXME: !!!! */
1709                 if (err == -NFS4ERR_MOVED) {
1710                         err = -EREMOTE;
1711                         break;
1712                 }
1713                 err = nfs4_handle_exception(server, err, &exception);
1714         } while (exception.retry);
1715         return err;
1716 }
1717
1718 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1719                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1720 {
1721         int status;
1722
1723         dprintk("NFS call  lookup %s\n", name->name);
1724         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1725         if (status == -NFS4ERR_MOVED)
1726                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1727         dprintk("NFS reply lookup: %d\n", status);
1728         return status;
1729 }
1730
1731 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1732 {
1733         struct nfs4_exception exception = { };
1734         int err;
1735         do {
1736                 err = nfs4_handle_exception(NFS_SERVER(dir),
1737                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1738                                 &exception);
1739         } while (exception.retry);
1740         return err;
1741 }
1742
1743 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1744 {
1745         struct nfs4_accessargs args = {
1746                 .fh = NFS_FH(inode),
1747         };
1748         struct nfs4_accessres res = { 0 };
1749         struct rpc_message msg = {
1750                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1751                 .rpc_argp = &args,
1752                 .rpc_resp = &res,
1753                 .rpc_cred = entry->cred,
1754         };
1755         int mode = entry->mask;
1756         int status;
1757
1758         /*
1759          * Determine which access bits we want to ask for...
1760          */
1761         if (mode & MAY_READ)
1762                 args.access |= NFS4_ACCESS_READ;
1763         if (S_ISDIR(inode->i_mode)) {
1764                 if (mode & MAY_WRITE)
1765                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1766                 if (mode & MAY_EXEC)
1767                         args.access |= NFS4_ACCESS_LOOKUP;
1768         } else {
1769                 if (mode & MAY_WRITE)
1770                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1771                 if (mode & MAY_EXEC)
1772                         args.access |= NFS4_ACCESS_EXECUTE;
1773         }
1774         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1775         if (!status) {
1776                 entry->mask = 0;
1777                 if (res.access & NFS4_ACCESS_READ)
1778                         entry->mask |= MAY_READ;
1779                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1780                         entry->mask |= MAY_WRITE;
1781                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1782                         entry->mask |= MAY_EXEC;
1783         }
1784         return status;
1785 }
1786
1787 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1788 {
1789         struct nfs4_exception exception = { };
1790         int err;
1791         do {
1792                 err = nfs4_handle_exception(NFS_SERVER(inode),
1793                                 _nfs4_proc_access(inode, entry),
1794                                 &exception);
1795         } while (exception.retry);
1796         return err;
1797 }
1798
1799 /*
1800  * TODO: For the time being, we don't try to get any attributes
1801  * along with any of the zero-copy operations READ, READDIR,
1802  * READLINK, WRITE.
1803  *
1804  * In the case of the first three, we want to put the GETATTR
1805  * after the read-type operation -- this is because it is hard
1806  * to predict the length of a GETATTR response in v4, and thus
1807  * align the READ data correctly.  This means that the GETATTR
1808  * may end up partially falling into the page cache, and we should
1809  * shift it into the 'tail' of the xdr_buf before processing.
1810  * To do this efficiently, we need to know the total length
1811  * of data received, which doesn't seem to be available outside
1812  * of the RPC layer.
1813  *
1814  * In the case of WRITE, we also want to put the GETATTR after
1815  * the operation -- in this case because we want to make sure
1816  * we get the post-operation mtime and size.  This means that
1817  * we can't use xdr_encode_pages() as written: we need a variant
1818  * of it which would leave room in the 'tail' iovec.
1819  *
1820  * Both of these changes to the XDR layer would in fact be quite
1821  * minor, but I decided to leave them for a subsequent patch.
1822  */
1823 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1824                 unsigned int pgbase, unsigned int pglen)
1825 {
1826         struct nfs4_readlink args = {
1827                 .fh       = NFS_FH(inode),
1828                 .pgbase   = pgbase,
1829                 .pglen    = pglen,
1830                 .pages    = &page,
1831         };
1832         struct rpc_message msg = {
1833                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1834                 .rpc_argp = &args,
1835                 .rpc_resp = NULL,
1836         };
1837
1838         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1839 }
1840
1841 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1842                 unsigned int pgbase, unsigned int pglen)
1843 {
1844         struct nfs4_exception exception = { };
1845         int err;
1846         do {
1847                 err = nfs4_handle_exception(NFS_SERVER(inode),
1848                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1849                                 &exception);
1850         } while (exception.retry);
1851         return err;
1852 }
1853
1854 /*
1855  * Got race?
1856  * We will need to arrange for the VFS layer to provide an atomic open.
1857  * Until then, this create/open method is prone to inefficiency and race
1858  * conditions due to the lookup, create, and open VFS calls from sys_open()
1859  * placed on the wire.
1860  *
1861  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1862  * The file will be opened again in the subsequent VFS open call
1863  * (nfs4_proc_file_open).
1864  *
1865  * The open for read will just hang around to be used by any process that
1866  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1867  */
1868
1869 static int
1870 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1871                  int flags, struct nameidata *nd)
1872 {
1873         struct path path = {
1874                 .mnt = nd->mnt,
1875                 .dentry = dentry,
1876         };
1877         struct nfs4_state *state;
1878         struct rpc_cred *cred;
1879         int status = 0;
1880
1881         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1882         if (IS_ERR(cred)) {
1883                 status = PTR_ERR(cred);
1884                 goto out;
1885         }
1886         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1887         put_rpccred(cred);
1888         if (IS_ERR(state)) {
1889                 status = PTR_ERR(state);
1890                 goto out;
1891         }
1892         d_instantiate(dentry, igrab(state->inode));
1893         if (flags & O_EXCL) {
1894                 struct nfs_fattr fattr;
1895                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1896                 if (status == 0)
1897                         nfs_setattr_update_inode(state->inode, sattr);
1898                 nfs_post_op_update_inode(state->inode, &fattr);
1899         }
1900         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1901                 status = nfs4_intent_set_file(nd, &path, state);
1902         else
1903                 nfs4_close_state(&path, state, flags);
1904 out:
1905         return status;
1906 }
1907
1908 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1909 {
1910         struct nfs_server *server = NFS_SERVER(dir);
1911         struct nfs4_remove_arg args = {
1912                 .fh = NFS_FH(dir),
1913                 .name = name,
1914                 .bitmask = server->attr_bitmask,
1915         };
1916         struct nfs_fattr dir_attr;
1917         struct nfs4_remove_res  res = {
1918                 .server = server,
1919                 .dir_attr = &dir_attr,
1920         };
1921         struct rpc_message msg = {
1922                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1923                 .rpc_argp       = &args,
1924                 .rpc_resp       = &res,
1925         };
1926         int                     status;
1927
1928         nfs_fattr_init(res.dir_attr);
1929         status = rpc_call_sync(server->client, &msg, 0);
1930         if (status == 0) {
1931                 update_changeattr(dir, &res.cinfo);
1932                 nfs_post_op_update_inode(dir, res.dir_attr);
1933         }
1934         return status;
1935 }
1936
1937 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1938 {
1939         struct nfs4_exception exception = { };
1940         int err;
1941         do {
1942                 err = nfs4_handle_exception(NFS_SERVER(dir),
1943                                 _nfs4_proc_remove(dir, name),
1944                                 &exception);
1945         } while (exception.retry);
1946         return err;
1947 }
1948
1949 struct unlink_desc {
1950         struct nfs4_remove_arg  args;
1951         struct nfs4_remove_res  res;
1952         struct nfs_fattr dir_attr;
1953 };
1954
1955 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1956                 struct qstr *name)
1957 {
1958         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1959         struct unlink_desc *up;
1960
1961         up = kmalloc(sizeof(*up), GFP_KERNEL);
1962         if (!up)
1963                 return -ENOMEM;
1964
1965         up->args.fh = NFS_FH(dir->d_inode);
1966         up->args.name = name;
1967         up->args.bitmask = server->attr_bitmask;
1968         up->res.server = server;
1969         up->res.dir_attr = &up->dir_attr;
1970
1971         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1972         msg->rpc_argp = &up->args;
1973         msg->rpc_resp = &up->res;
1974         return 0;
1975 }
1976
1977 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1978 {
1979         struct rpc_message *msg = &task->tk_msg;
1980         struct unlink_desc *up;
1981
1982         if (msg->rpc_resp != NULL) {
1983                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1984                 update_changeattr(dir->d_inode, &up->res.cinfo);
1985                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1986                 kfree(up);
1987                 msg->rpc_resp = NULL;
1988                 msg->rpc_argp = NULL;
1989         }
1990         return 0;
1991 }
1992
1993 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1994                 struct inode *new_dir, struct qstr *new_name)
1995 {
1996         struct nfs_server *server = NFS_SERVER(old_dir);
1997         struct nfs4_rename_arg arg = {
1998                 .old_dir = NFS_FH(old_dir),
1999                 .new_dir = NFS_FH(new_dir),
2000                 .old_name = old_name,
2001                 .new_name = new_name,
2002                 .bitmask = server->attr_bitmask,
2003         };
2004         struct nfs_fattr old_fattr, new_fattr;
2005         struct nfs4_rename_res res = {
2006                 .server = server,
2007                 .old_fattr = &old_fattr,
2008                 .new_fattr = &new_fattr,
2009         };
2010         struct rpc_message msg = {
2011                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2012                 .rpc_argp = &arg,
2013                 .rpc_resp = &res,
2014         };
2015         int                     status;
2016
2017         nfs_fattr_init(res.old_fattr);
2018         nfs_fattr_init(res.new_fattr);
2019         status = rpc_call_sync(server->client, &msg, 0);
2020
2021         if (!status) {
2022                 update_changeattr(old_dir, &res.old_cinfo);
2023                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2024                 update_changeattr(new_dir, &res.new_cinfo);
2025                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2026         }
2027         return status;
2028 }
2029
2030 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2031                 struct inode *new_dir, struct qstr *new_name)
2032 {
2033         struct nfs4_exception exception = { };
2034         int err;
2035         do {
2036                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2037                                 _nfs4_proc_rename(old_dir, old_name,
2038                                         new_dir, new_name),
2039                                 &exception);
2040         } while (exception.retry);
2041         return err;
2042 }
2043
2044 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2045 {
2046         struct nfs_server *server = NFS_SERVER(inode);
2047         struct nfs4_link_arg arg = {
2048                 .fh     = NFS_FH(inode),
2049                 .dir_fh = NFS_FH(dir),
2050                 .name   = name,
2051                 .bitmask = server->attr_bitmask,
2052         };
2053         struct nfs_fattr fattr, dir_attr;
2054         struct nfs4_link_res res = {
2055                 .server = server,
2056                 .fattr = &fattr,
2057                 .dir_attr = &dir_attr,
2058         };
2059         struct rpc_message msg = {
2060                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2061                 .rpc_argp = &arg,
2062                 .rpc_resp = &res,
2063         };
2064         int                     status;
2065
2066         nfs_fattr_init(res.fattr);
2067         nfs_fattr_init(res.dir_attr);
2068         status = rpc_call_sync(server->client, &msg, 0);
2069         if (!status) {
2070                 update_changeattr(dir, &res.cinfo);
2071                 nfs_post_op_update_inode(dir, res.dir_attr);
2072                 nfs_post_op_update_inode(inode, res.fattr);
2073         }
2074
2075         return status;
2076 }
2077
2078 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2079 {
2080         struct nfs4_exception exception = { };
2081         int err;
2082         do {
2083                 err = nfs4_handle_exception(NFS_SERVER(inode),
2084                                 _nfs4_proc_link(inode, dir, name),
2085                                 &exception);
2086         } while (exception.retry);
2087         return err;
2088 }
2089
2090 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2091                 struct page *page, unsigned int len, struct iattr *sattr)
2092 {
2093         struct nfs_server *server = NFS_SERVER(dir);
2094         struct nfs_fh fhandle;
2095         struct nfs_fattr fattr, dir_fattr;
2096         struct nfs4_create_arg arg = {
2097                 .dir_fh = NFS_FH(dir),
2098                 .server = server,
2099                 .name = &dentry->d_name,
2100                 .attrs = sattr,
2101                 .ftype = NF4LNK,
2102                 .bitmask = server->attr_bitmask,
2103         };
2104         struct nfs4_create_res res = {
2105                 .server = server,
2106                 .fh = &fhandle,
2107                 .fattr = &fattr,
2108                 .dir_fattr = &dir_fattr,
2109         };
2110         struct rpc_message msg = {
2111                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2112                 .rpc_argp = &arg,
2113                 .rpc_resp = &res,
2114         };
2115         int                     status;
2116
2117         if (len > NFS4_MAXPATHLEN)
2118                 return -ENAMETOOLONG;
2119
2120         arg.u.symlink.pages = &page;
2121         arg.u.symlink.len = len;
2122         nfs_fattr_init(&fattr);
2123         nfs_fattr_init(&dir_fattr);
2124
2125         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2126         if (!status) {
2127                 update_changeattr(dir, &res.dir_cinfo);
2128                 nfs_post_op_update_inode(dir, res.dir_fattr);
2129                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2130         }
2131         return status;
2132 }
2133
2134 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2135                 struct page *page, unsigned int len, struct iattr *sattr)
2136 {
2137         struct nfs4_exception exception = { };
2138         int err;
2139         do {
2140                 err = nfs4_handle_exception(NFS_SERVER(dir),
2141                                 _nfs4_proc_symlink(dir, dentry, page,
2142                                                         len, sattr),
2143                                 &exception);
2144         } while (exception.retry);
2145         return err;
2146 }
2147
2148 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2149                 struct iattr *sattr)
2150 {
2151         struct nfs_server *server = NFS_SERVER(dir);
2152         struct nfs_fh fhandle;
2153         struct nfs_fattr fattr, dir_fattr;
2154         struct nfs4_create_arg arg = {
2155                 .dir_fh = NFS_FH(dir),
2156                 .server = server,
2157                 .name = &dentry->d_name,
2158                 .attrs = sattr,
2159                 .ftype = NF4DIR,
2160                 .bitmask = server->attr_bitmask,
2161         };
2162         struct nfs4_create_res res = {
2163                 .server = server,
2164                 .fh = &fhandle,
2165                 .fattr = &fattr,
2166                 .dir_fattr = &dir_fattr,
2167         };
2168         struct rpc_message msg = {
2169                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2170                 .rpc_argp = &arg,
2171                 .rpc_resp = &res,
2172         };
2173         int                     status;
2174
2175         nfs_fattr_init(&fattr);
2176         nfs_fattr_init(&dir_fattr);
2177
2178         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2179         if (!status) {
2180                 update_changeattr(dir, &res.dir_cinfo);
2181                 nfs_post_op_update_inode(dir, res.dir_fattr);
2182                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2183         }
2184         return status;
2185 }
2186
2187 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2188                 struct iattr *sattr)
2189 {
2190         struct nfs4_exception exception = { };
2191         int err;
2192         do {
2193                 err = nfs4_handle_exception(NFS_SERVER(dir),
2194                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2195                                 &exception);
2196         } while (exception.retry);
2197         return err;
2198 }
2199
2200 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2201                   u64 cookie, struct page *page, unsigned int count, int plus)
2202 {
2203         struct inode            *dir = dentry->d_inode;
2204         struct nfs4_readdir_arg args = {
2205                 .fh = NFS_FH(dir),
2206                 .pages = &page,
2207                 .pgbase = 0,
2208                 .count = count,
2209                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2210         };
2211         struct nfs4_readdir_res res;
2212         struct rpc_message msg = {
2213                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2214                 .rpc_argp = &args,
2215                 .rpc_resp = &res,
2216                 .rpc_cred = cred,
2217         };
2218         int                     status;
2219
2220         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2221                         dentry->d_parent->d_name.name,
2222                         dentry->d_name.name,
2223                         (unsigned long long)cookie);
2224         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2225         res.pgbase = args.pgbase;
2226         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2227         if (status == 0)
2228                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2229         dprintk("%s: returns %d\n", __FUNCTION__, status);
2230         return status;
2231 }
2232
2233 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2234                   u64 cookie, struct page *page, unsigned int count, int plus)
2235 {
2236         struct nfs4_exception exception = { };
2237         int err;
2238         do {
2239                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2240                                 _nfs4_proc_readdir(dentry, cred, cookie,
2241                                         page, count, plus),
2242                                 &exception);
2243         } while (exception.retry);
2244         return err;
2245 }
2246
2247 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2248                 struct iattr *sattr, dev_t rdev)
2249 {
2250         struct nfs_server *server = NFS_SERVER(dir);
2251         struct nfs_fh fh;
2252         struct nfs_fattr fattr, dir_fattr;
2253         struct nfs4_create_arg arg = {
2254                 .dir_fh = NFS_FH(dir),
2255                 .server = server,
2256                 .name = &dentry->d_name,
2257                 .attrs = sattr,
2258                 .bitmask = server->attr_bitmask,
2259         };
2260         struct nfs4_create_res res = {
2261                 .server = server,
2262                 .fh = &fh,
2263                 .fattr = &fattr,
2264                 .dir_fattr = &dir_fattr,
2265         };
2266         struct rpc_message msg = {
2267                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2268                 .rpc_argp = &arg,
2269                 .rpc_resp = &res,
2270         };
2271         int                     status;
2272         int                     mode = sattr->ia_mode;
2273
2274         nfs_fattr_init(&fattr);
2275         nfs_fattr_init(&dir_fattr);
2276
2277         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2278         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2279         if (S_ISFIFO(mode))
2280                 arg.ftype = NF4FIFO;
2281         else if (S_ISBLK(mode)) {
2282                 arg.ftype = NF4BLK;
2283                 arg.u.device.specdata1 = MAJOR(rdev);
2284                 arg.u.device.specdata2 = MINOR(rdev);
2285         }
2286         else if (S_ISCHR(mode)) {
2287                 arg.ftype = NF4CHR;
2288                 arg.u.device.specdata1 = MAJOR(rdev);
2289                 arg.u.device.specdata2 = MINOR(rdev);
2290         }
2291         else
2292                 arg.ftype = NF4SOCK;
2293
2294         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2295         if (status == 0) {
2296                 update_changeattr(dir, &res.dir_cinfo);
2297                 nfs_post_op_update_inode(dir, res.dir_fattr);
2298                 status = nfs_instantiate(dentry, &fh, &fattr);
2299         }
2300         return status;
2301 }
2302
2303 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2304                 struct iattr *sattr, dev_t rdev)
2305 {
2306         struct nfs4_exception exception = { };
2307         int err;
2308         do {
2309                 err = nfs4_handle_exception(NFS_SERVER(dir),
2310                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2311                                 &exception);
2312         } while (exception.retry);
2313         return err;
2314 }
2315
2316 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2317                  struct nfs_fsstat *fsstat)
2318 {
2319         struct nfs4_statfs_arg args = {
2320                 .fh = fhandle,
2321                 .bitmask = server->attr_bitmask,
2322         };
2323         struct rpc_message msg = {
2324                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2325                 .rpc_argp = &args,
2326                 .rpc_resp = fsstat,
2327         };
2328
2329         nfs_fattr_init(fsstat->fattr);
2330         return rpc_call_sync(server->client, &msg, 0);
2331 }
2332
2333 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2334 {
2335         struct nfs4_exception exception = { };
2336         int err;
2337         do {
2338                 err = nfs4_handle_exception(server,
2339                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2340                                 &exception);
2341         } while (exception.retry);
2342         return err;
2343 }
2344
2345 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2346                 struct nfs_fsinfo *fsinfo)
2347 {
2348         struct nfs4_fsinfo_arg args = {
2349                 .fh = fhandle,
2350                 .bitmask = server->attr_bitmask,
2351         };
2352         struct rpc_message msg = {
2353                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2354                 .rpc_argp = &args,
2355                 .rpc_resp = fsinfo,
2356         };
2357
2358         return rpc_call_sync(server->client, &msg, 0);
2359 }
2360
2361 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2362 {
2363         struct nfs4_exception exception = { };
2364         int err;
2365
2366         do {
2367                 err = nfs4_handle_exception(server,
2368                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2369                                 &exception);
2370         } while (exception.retry);
2371         return err;
2372 }
2373
2374 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2375 {
2376         nfs_fattr_init(fsinfo->fattr);
2377         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2378 }
2379
2380 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2381                 struct nfs_pathconf *pathconf)
2382 {
2383         struct nfs4_pathconf_arg args = {
2384                 .fh = fhandle,
2385                 .bitmask = server->attr_bitmask,
2386         };
2387         struct rpc_message msg = {
2388                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2389                 .rpc_argp = &args,
2390                 .rpc_resp = pathconf,
2391         };
2392
2393         /* None of the pathconf attributes are mandatory to implement */
2394         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2395                 memset(pathconf, 0, sizeof(*pathconf));
2396                 return 0;
2397         }
2398
2399         nfs_fattr_init(pathconf->fattr);
2400         return rpc_call_sync(server->client, &msg, 0);
2401 }
2402
2403 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2404                 struct nfs_pathconf *pathconf)
2405 {
2406         struct nfs4_exception exception = { };
2407         int err;
2408
2409         do {
2410                 err = nfs4_handle_exception(server,
2411                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2412                                 &exception);
2413         } while (exception.retry);
2414         return err;
2415 }
2416
2417 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2418 {
2419         struct nfs_server *server = NFS_SERVER(data->inode);
2420
2421         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2422                 rpc_restart_call(task);
2423                 return -EAGAIN;
2424         }
2425         if (task->tk_status > 0)
2426                 renew_lease(server, data->timestamp);
2427         return 0;
2428 }
2429
2430 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2431 {
2432         struct rpc_message msg = {
2433                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2434                 .rpc_argp = &data->args,
2435                 .rpc_resp = &data->res,
2436                 .rpc_cred = data->cred,
2437         };
2438
2439         data->timestamp   = jiffies;
2440
2441         rpc_call_setup(&data->task, &msg, 0);
2442 }
2443
2444 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2445 {
2446         struct inode *inode = data->inode;
2447
2448         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2449                 rpc_restart_call(task);
2450                 return -EAGAIN;
2451         }
2452         if (task->tk_status >= 0) {
2453                 renew_lease(NFS_SERVER(inode), data->timestamp);
2454                 nfs_post_op_update_inode(inode, data->res.fattr);
2455         }
2456         return 0;
2457 }
2458
2459 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2460 {
2461         struct rpc_message msg = {
2462                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2463                 .rpc_argp = &data->args,
2464                 .rpc_resp = &data->res,
2465                 .rpc_cred = data->cred,
2466         };
2467         struct inode *inode = data->inode;
2468         struct nfs_server *server = NFS_SERVER(inode);
2469         int stable;
2470
2471         if (how & FLUSH_STABLE) {
2472                 if (!NFS_I(inode)->ncommit)
2473                         stable = NFS_FILE_SYNC;
2474                 else
2475                         stable = NFS_DATA_SYNC;
2476         } else
2477                 stable = NFS_UNSTABLE;
2478         data->args.stable = stable;
2479         data->args.bitmask = server->attr_bitmask;
2480         data->res.server = server;
2481
2482         data->timestamp   = jiffies;
2483
2484         /* Finalize the task. */
2485         rpc_call_setup(&data->task, &msg, 0);
2486 }
2487
2488 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2489 {
2490         struct inode *inode = data->inode;
2491
2492         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2493                 rpc_restart_call(task);
2494                 return -EAGAIN;
2495         }
2496         if (task->tk_status >= 0)
2497                 nfs_post_op_update_inode(inode, data->res.fattr);
2498         return 0;
2499 }
2500
2501 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2502 {
2503         struct rpc_message msg = {
2504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2505                 .rpc_argp = &data->args,
2506                 .rpc_resp = &data->res,
2507                 .rpc_cred = data->cred,
2508         };
2509         struct nfs_server *server = NFS_SERVER(data->inode);
2510
2511         data->args.bitmask = server->attr_bitmask;
2512         data->res.server = server;
2513
2514         rpc_call_setup(&data->task, &msg, 0);
2515 }
2516
2517 /*
2518  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2519  * standalone procedure for queueing an asynchronous RENEW.
2520  */
2521 static void nfs4_renew_done(struct rpc_task *task, void *data)
2522 {
2523         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2524         unsigned long timestamp = (unsigned long)data;
2525
2526         if (task->tk_status < 0) {
2527                 switch (task->tk_status) {
2528                         case -NFS4ERR_STALE_CLIENTID:
2529                         case -NFS4ERR_EXPIRED:
2530                         case -NFS4ERR_CB_PATH_DOWN:
2531                                 nfs4_schedule_state_recovery(clp);
2532                 }
2533                 return;
2534         }
2535         spin_lock(&clp->cl_lock);
2536         if (time_before(clp->cl_last_renewal,timestamp))
2537                 clp->cl_last_renewal = timestamp;
2538         spin_unlock(&clp->cl_lock);
2539 }
2540
2541 static const struct rpc_call_ops nfs4_renew_ops = {
2542         .rpc_call_done = nfs4_renew_done,
2543 };
2544
2545 int nfs4_proc_async_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
2553         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2554                         &nfs4_renew_ops, (void *)jiffies);
2555 }
2556
2557 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2558 {
2559         struct rpc_message msg = {
2560                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2561                 .rpc_argp       = clp,
2562                 .rpc_cred       = cred,
2563         };
2564         unsigned long now = jiffies;
2565         int status;
2566
2567         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2568         if (status < 0)
2569                 return status;
2570         spin_lock(&clp->cl_lock);
2571         if (time_before(clp->cl_last_renewal,now))
2572                 clp->cl_last_renewal = now;
2573         spin_unlock(&clp->cl_lock);
2574         return 0;
2575 }
2576
2577 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2578 {
2579         return (server->caps & NFS_CAP_ACLS)
2580                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2581                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2582 }
2583
2584 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2585  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2586  * the stack.
2587  */
2588 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2589
2590 static void buf_to_pages(const void *buf, size_t buflen,
2591                 struct page **pages, unsigned int *pgbase)
2592 {
2593         const void *p = buf;
2594
2595         *pgbase = offset_in_page(buf);
2596         p -= *pgbase;
2597         while (p < buf + buflen) {
2598                 *(pages++) = virt_to_page(p);
2599                 p += PAGE_CACHE_SIZE;
2600         }
2601 }
2602
2603 struct nfs4_cached_acl {
2604         int cached;
2605         size_t len;
2606         char data[0];
2607 };
2608
2609 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2610 {
2611         struct nfs_inode *nfsi = NFS_I(inode);
2612
2613         spin_lock(&inode->i_lock);
2614         kfree(nfsi->nfs4_acl);
2615         nfsi->nfs4_acl = acl;
2616         spin_unlock(&inode->i_lock);
2617 }
2618
2619 static void nfs4_zap_acl_attr(struct inode *inode)
2620 {
2621         nfs4_set_cached_acl(inode, NULL);
2622 }
2623
2624 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2625 {
2626         struct nfs_inode *nfsi = NFS_I(inode);
2627         struct nfs4_cached_acl *acl;
2628         int ret = -ENOENT;
2629
2630         spin_lock(&inode->i_lock);
2631         acl = nfsi->nfs4_acl;
2632         if (acl == NULL)
2633                 goto out;
2634         if (buf == NULL) /* user is just asking for length */
2635                 goto out_len;
2636         if (acl->cached == 0)
2637                 goto out;
2638         ret = -ERANGE; /* see getxattr(2) man page */
2639         if (acl->len > buflen)
2640                 goto out;
2641         memcpy(buf, acl->data, acl->len);
2642 out_len:
2643         ret = acl->len;
2644 out:
2645         spin_unlock(&inode->i_lock);
2646         return ret;
2647 }
2648
2649 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2650 {
2651         struct nfs4_cached_acl *acl;
2652
2653         if (buf && acl_len <= PAGE_SIZE) {
2654                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2655                 if (acl == NULL)
2656                         goto out;
2657                 acl->cached = 1;
2658                 memcpy(acl->data, buf, acl_len);
2659         } else {
2660                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2661                 if (acl == NULL)
2662                         goto out;
2663                 acl->cached = 0;
2664         }
2665         acl->len = acl_len;
2666 out:
2667         nfs4_set_cached_acl(inode, acl);
2668 }
2669
2670 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2671 {
2672         struct page *pages[NFS4ACL_MAXPAGES];
2673         struct nfs_getaclargs args = {
2674                 .fh = NFS_FH(inode),
2675                 .acl_pages = pages,
2676                 .acl_len = buflen,
2677         };
2678         size_t resp_len = buflen;
2679         void *resp_buf;
2680         struct rpc_message msg = {
2681                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2682                 .rpc_argp = &args,
2683                 .rpc_resp = &resp_len,
2684         };
2685         struct page *localpage = NULL;
2686         int ret;
2687
2688         if (buflen < PAGE_SIZE) {
2689                 /* As long as we're doing a round trip to the server anyway,
2690                  * let's be prepared for a page of acl data. */
2691                 localpage = alloc_page(GFP_KERNEL);
2692                 resp_buf = page_address(localpage);
2693                 if (localpage == NULL)
2694                         return -ENOMEM;
2695                 args.acl_pages[0] = localpage;
2696                 args.acl_pgbase = 0;
2697                 resp_len = args.acl_len = PAGE_SIZE;
2698         } else {
2699                 resp_buf = buf;
2700                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2701         }
2702         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2703         if (ret)
2704                 goto out_free;
2705         if (resp_len > args.acl_len)
2706                 nfs4_write_cached_acl(inode, NULL, resp_len);
2707         else
2708                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2709         if (buf) {
2710                 ret = -ERANGE;
2711                 if (resp_len > buflen)
2712                         goto out_free;
2713                 if (localpage)
2714                         memcpy(buf, resp_buf, resp_len);
2715         }
2716         ret = resp_len;
2717 out_free:
2718         if (localpage)
2719                 __free_page(localpage);
2720         return ret;
2721 }
2722
2723 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2724 {
2725         struct nfs4_exception exception = { };
2726         ssize_t ret;
2727         do {
2728                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2729                 if (ret >= 0)
2730                         break;
2731                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2732         } while (exception.retry);
2733         return ret;
2734 }
2735
2736 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2737 {
2738         struct nfs_server *server = NFS_SERVER(inode);
2739         int ret;
2740
2741         if (!nfs4_server_supports_acls(server))
2742                 return -EOPNOTSUPP;
2743         ret = nfs_revalidate_inode(server, inode);
2744         if (ret < 0)
2745                 return ret;
2746         ret = nfs4_read_cached_acl(inode, buf, buflen);
2747         if (ret != -ENOENT)
2748                 return ret;
2749         return nfs4_get_acl_uncached(inode, buf, buflen);
2750 }
2751
2752 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2753 {
2754         struct nfs_server *server = NFS_SERVER(inode);
2755         struct page *pages[NFS4ACL_MAXPAGES];
2756         struct nfs_setaclargs arg = {
2757                 .fh             = NFS_FH(inode),
2758                 .acl_pages      = pages,
2759                 .acl_len        = buflen,
2760         };
2761         struct rpc_message msg = {
2762                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2763                 .rpc_argp       = &arg,
2764                 .rpc_resp       = NULL,
2765         };
2766         int ret;
2767
2768         if (!nfs4_server_supports_acls(server))
2769                 return -EOPNOTSUPP;
2770         nfs_inode_return_delegation(inode);
2771         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2772         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2773         nfs_zap_caches(inode);
2774         return ret;
2775 }
2776
2777 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2778 {
2779         struct nfs4_exception exception = { };
2780         int err;
2781         do {
2782                 err = nfs4_handle_exception(NFS_SERVER(inode),
2783                                 __nfs4_proc_set_acl(inode, buf, buflen),
2784                                 &exception);
2785         } while (exception.retry);
2786         return err;
2787 }
2788
2789 static int
2790 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2791 {
2792         struct nfs_client *clp = server->nfs_client;
2793
2794         if (!clp || task->tk_status >= 0)
2795                 return 0;
2796         switch(task->tk_status) {
2797                 case -NFS4ERR_STALE_CLIENTID:
2798                 case -NFS4ERR_STALE_STATEID:
2799                 case -NFS4ERR_EXPIRED:
2800                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2801                         nfs4_schedule_state_recovery(clp);
2802                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2803                                 rpc_wake_up_task(task);
2804                         task->tk_status = 0;
2805                         return -EAGAIN;
2806                 case -NFS4ERR_DELAY:
2807                         nfs_inc_server_stats((struct nfs_server *) server,
2808                                                 NFSIOS_DELAY);
2809                 case -NFS4ERR_GRACE:
2810                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2811                         task->tk_status = 0;
2812                         return -EAGAIN;
2813                 case -NFS4ERR_OLD_STATEID:
2814                         task->tk_status = 0;
2815                         return -EAGAIN;
2816         }
2817         task->tk_status = nfs4_map_errors(task->tk_status);
2818         return 0;
2819 }
2820
2821 static int nfs4_wait_bit_interruptible(void *word)
2822 {
2823         if (signal_pending(current))
2824                 return -ERESTARTSYS;
2825         schedule();
2826         return 0;
2827 }
2828
2829 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2830 {
2831         sigset_t oldset;
2832         int res;
2833
2834         might_sleep();
2835
2836         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2837
2838         rpc_clnt_sigmask(clnt, &oldset);
2839         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2840                         nfs4_wait_bit_interruptible,
2841                         TASK_INTERRUPTIBLE);
2842         rpc_clnt_sigunmask(clnt, &oldset);
2843
2844         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2845         return res;
2846 }
2847
2848 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2849 {
2850         sigset_t oldset;
2851         int res = 0;
2852
2853         might_sleep();
2854
2855         if (*timeout <= 0)
2856                 *timeout = NFS4_POLL_RETRY_MIN;
2857         if (*timeout > NFS4_POLL_RETRY_MAX)
2858                 *timeout = NFS4_POLL_RETRY_MAX;
2859         rpc_clnt_sigmask(clnt, &oldset);
2860         if (clnt->cl_intr) {
2861                 schedule_timeout_interruptible(*timeout);
2862                 if (signalled())
2863                         res = -ERESTARTSYS;
2864         } else
2865                 schedule_timeout_uninterruptible(*timeout);
2866         rpc_clnt_sigunmask(clnt, &oldset);
2867         *timeout <<= 1;
2868         return res;
2869 }
2870
2871 /* This is the error handling routine for processes that are allowed
2872  * to sleep.
2873  */
2874 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2875 {
2876         struct nfs_client *clp = server->nfs_client;
2877         int ret = errorcode;
2878
2879         exception->retry = 0;
2880         switch(errorcode) {
2881                 case 0:
2882                         return 0;
2883                 case -NFS4ERR_STALE_CLIENTID:
2884                 case -NFS4ERR_STALE_STATEID:
2885                 case -NFS4ERR_EXPIRED:
2886                         nfs4_schedule_state_recovery(clp);
2887                         ret = nfs4_wait_clnt_recover(server->client, clp);
2888                         if (ret == 0)
2889                                 exception->retry = 1;
2890                         break;
2891                 case -NFS4ERR_FILE_OPEN:
2892                 case -NFS4ERR_GRACE:
2893                 case -NFS4ERR_DELAY:
2894                         ret = nfs4_delay(server->client, &exception->timeout);
2895                         if (ret != 0)
2896                                 break;
2897                 case -NFS4ERR_OLD_STATEID:
2898                         exception->retry = 1;
2899         }
2900         /* We failed to handle the error */
2901         return nfs4_map_errors(ret);
2902 }
2903
2904 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2905 {
2906         nfs4_verifier sc_verifier;
2907         struct nfs4_setclientid setclientid = {
2908                 .sc_verifier = &sc_verifier,
2909                 .sc_prog = program,
2910         };
2911         struct rpc_message msg = {
2912                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2913                 .rpc_argp = &setclientid,
2914                 .rpc_resp = clp,
2915                 .rpc_cred = cred,
2916         };
2917         __be32 *p;
2918         int loop = 0;
2919         int status;
2920
2921         p = (__be32*)sc_verifier.data;
2922         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2923         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2924
2925         for(;;) {
2926                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2927                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2928                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2929                                 cred->cr_ops->cr_name,
2930                                 clp->cl_id_uniquifier);
2931                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2932                                 sizeof(setclientid.sc_netid), "tcp");
2933                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2934                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2935                                 clp->cl_ipaddr, port >> 8, port & 255);
2936
2937                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2938                 if (status != -NFS4ERR_CLID_INUSE)
2939                         break;
2940                 if (signalled())
2941                         break;
2942                 if (loop++ & 1)
2943                         ssleep(clp->cl_lease_time + 1);
2944                 else
2945                         if (++clp->cl_id_uniquifier == 0)
2946                                 break;
2947         }
2948         return status;
2949 }
2950
2951 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2952 {
2953         struct nfs_fsinfo fsinfo;
2954         struct rpc_message msg = {
2955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2956                 .rpc_argp = clp,
2957                 .rpc_resp = &fsinfo,
2958                 .rpc_cred = cred,
2959         };
2960         unsigned long now;
2961         int status;
2962
2963         now = jiffies;
2964         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2965         if (status == 0) {
2966                 spin_lock(&clp->cl_lock);
2967                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2968                 clp->cl_last_renewal = now;
2969                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2970                 spin_unlock(&clp->cl_lock);
2971         }
2972         return status;
2973 }
2974
2975 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2976 {
2977         long timeout;
2978         int err;
2979         do {
2980                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2981                 switch (err) {
2982                         case 0:
2983                                 return err;
2984                         case -NFS4ERR_RESOURCE:
2985                                 /* The IBM lawyers misread another document! */
2986                         case -NFS4ERR_DELAY:
2987                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2988                 }
2989         } while (err == 0);
2990         return err;
2991 }
2992
2993 struct nfs4_delegreturndata {
2994         struct nfs4_delegreturnargs args;
2995         struct nfs4_delegreturnres res;
2996         struct nfs_fh fh;
2997         nfs4_stateid stateid;
2998         struct rpc_cred *cred;
2999         unsigned long timestamp;
3000         struct nfs_fattr fattr;
3001         int rpc_status;
3002 };
3003
3004 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
3005 {
3006         struct nfs4_delegreturndata *data = calldata;
3007         struct rpc_message msg = {
3008                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3009                 .rpc_argp = &data->args,
3010                 .rpc_resp = &data->res,
3011                 .rpc_cred = data->cred,
3012         };
3013         nfs_fattr_init(data->res.fattr);
3014         rpc_call_setup(task, &msg, 0);
3015 }
3016
3017 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3018 {
3019         struct nfs4_delegreturndata *data = calldata;
3020         data->rpc_status = task->tk_status;
3021         if (data->rpc_status == 0)
3022                 renew_lease(data->res.server, data->timestamp);
3023 }
3024
3025 static void nfs4_delegreturn_release(void *calldata)
3026 {
3027         struct nfs4_delegreturndata *data = calldata;
3028
3029         put_rpccred(data->cred);
3030         kfree(calldata);
3031 }
3032
3033 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3034         .rpc_call_prepare = nfs4_delegreturn_prepare,
3035         .rpc_call_done = nfs4_delegreturn_done,
3036         .rpc_release = nfs4_delegreturn_release,
3037 };
3038
3039 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3040 {
3041         struct nfs4_delegreturndata *data;
3042         struct nfs_server *server = NFS_SERVER(inode);
3043         struct rpc_task *task;
3044         int status;
3045
3046         data = kmalloc(sizeof(*data), GFP_KERNEL);
3047         if (data == NULL)
3048                 return -ENOMEM;
3049         data->args.fhandle = &data->fh;
3050         data->args.stateid = &data->stateid;
3051         data->args.bitmask = server->attr_bitmask;
3052         nfs_copy_fh(&data->fh, NFS_FH(inode));
3053         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3054         data->res.fattr = &data->fattr;
3055         data->res.server = server;
3056         data->cred = get_rpccred(cred);
3057         data->timestamp = jiffies;
3058         data->rpc_status = 0;
3059
3060         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3061         if (IS_ERR(task))
3062                 return PTR_ERR(task);
3063         status = nfs4_wait_for_completion_rpc_task(task);
3064         if (status == 0) {
3065                 status = data->rpc_status;
3066                 if (status == 0)
3067                         nfs_post_op_update_inode(inode, &data->fattr);
3068         }
3069         rpc_put_task(task);
3070         return status;
3071 }
3072
3073 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3074 {
3075         struct nfs_server *server = NFS_SERVER(inode);
3076         struct nfs4_exception exception = { };
3077         int err;
3078         do {
3079                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3080                 switch (err) {
3081                         case -NFS4ERR_STALE_STATEID:
3082                         case -NFS4ERR_EXPIRED:
3083                         case 0:
3084                                 return 0;
3085                 }
3086                 err = nfs4_handle_exception(server, err, &exception);
3087         } while (exception.retry);
3088         return err;
3089 }
3090
3091 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3092 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3093
3094 /*
3095  * sleep, with exponential backoff, and retry the LOCK operation.
3096  */
3097 static unsigned long
3098 nfs4_set_lock_task_retry(unsigned long timeout)
3099 {
3100         schedule_timeout_interruptible(timeout);
3101         timeout <<= 1;
3102         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3103                 return NFS4_LOCK_MAXTIMEOUT;
3104         return timeout;
3105 }
3106
3107 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3108 {
3109         struct inode *inode = state->inode;
3110         struct nfs_server *server = NFS_SERVER(inode);
3111         struct nfs_client *clp = server->nfs_client;
3112         struct nfs_lockt_args arg = {
3113                 .fh = NFS_FH(inode),
3114                 .fl = request,
3115         };
3116         struct nfs_lockt_res res = {
3117                 .denied = request,
3118         };
3119         struct rpc_message msg = {
3120                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3121                 .rpc_argp       = &arg,
3122                 .rpc_resp       = &res,
3123                 .rpc_cred       = state->owner->so_cred,
3124         };
3125         struct nfs4_lock_state *lsp;
3126         int status;
3127
3128         down_read(&clp->cl_sem);
3129         arg.lock_owner.clientid = clp->cl_clientid;
3130         status = nfs4_set_lock_state(state, request);
3131         if (status != 0)
3132                 goto out;
3133         lsp = request->fl_u.nfs4_fl.owner;
3134         arg.lock_owner.id = lsp->ls_id.id;
3135         status = rpc_call_sync(server->client, &msg, 0);
3136         switch (status) {
3137                 case 0:
3138                         request->fl_type = F_UNLCK;
3139                         break;
3140                 case -NFS4ERR_DENIED:
3141                         status = 0;
3142         }
3143         request->fl_ops->fl_release_private(request);
3144 out:
3145         up_read(&clp->cl_sem);
3146         return status;
3147 }
3148
3149 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3150 {
3151         struct nfs4_exception exception = { };
3152         int err;
3153
3154         do {
3155                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3156                                 _nfs4_proc_getlk(state, cmd, request),
3157                                 &exception);
3158         } while (exception.retry);
3159         return err;
3160 }
3161
3162 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3163 {
3164         int res = 0;
3165         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3166                 case FL_POSIX:
3167                         res = posix_lock_file_wait(file, fl);
3168                         break;
3169                 case FL_FLOCK:
3170                         res = flock_lock_file_wait(file, fl);
3171                         break;
3172                 default:
3173                         BUG();
3174         }
3175         return res;
3176 }
3177
3178 struct nfs4_unlockdata {
3179         struct nfs_locku_args arg;
3180         struct nfs_locku_res res;
3181         struct nfs4_lock_state *lsp;
3182         struct nfs_open_context *ctx;
3183         struct file_lock fl;
3184         const struct nfs_server *server;
3185         unsigned long timestamp;
3186 };
3187
3188 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3189                 struct nfs_open_context *ctx,
3190                 struct nfs4_lock_state *lsp,
3191                 struct nfs_seqid *seqid)
3192 {
3193         struct nfs4_unlockdata *p;
3194         struct inode *inode = lsp->ls_state->inode;
3195
3196         p = kmalloc(sizeof(*p), GFP_KERNEL);
3197         if (p == NULL)
3198                 return NULL;
3199         p->arg.fh = NFS_FH(inode);
3200         p->arg.fl = &p->fl;
3201         p->arg.seqid = seqid;
3202         p->arg.stateid = &lsp->ls_stateid;
3203         p->lsp = lsp;
3204         atomic_inc(&lsp->ls_count);
3205         /* Ensure we don't close file until we're done freeing locks! */
3206         p->ctx = get_nfs_open_context(ctx);
3207         memcpy(&p->fl, fl, sizeof(p->fl));
3208         p->server = NFS_SERVER(inode);
3209         return p;
3210 }
3211
3212 static void nfs4_locku_release_calldata(void *data)
3213 {
3214         struct nfs4_unlockdata *calldata = data;
3215         nfs_free_seqid(calldata->arg.seqid);
3216         nfs4_put_lock_state(calldata->lsp);
3217         put_nfs_open_context(calldata->ctx);
3218         kfree(calldata);
3219 }
3220
3221 static void nfs4_locku_done(struct rpc_task *task, void *data)
3222 {
3223         struct nfs4_unlockdata *calldata = data;
3224
3225         if (RPC_ASSASSINATED(task))
3226                 return;
3227         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3228         switch (task->tk_status) {
3229                 case 0:
3230                         memcpy(calldata->lsp->ls_stateid.data,
3231                                         calldata->res.stateid.data,
3232                                         sizeof(calldata->lsp->ls_stateid.data));
3233                         renew_lease(calldata->server, calldata->timestamp);
3234                         break;
3235                 case -NFS4ERR_STALE_STATEID:
3236                 case -NFS4ERR_EXPIRED:
3237                         break;
3238                 default:
3239                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3240                                 rpc_restart_call(task);
3241         }
3242 }
3243
3244 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3245 {
3246         struct nfs4_unlockdata *calldata = data;
3247         struct rpc_message msg = {
3248                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3249                 .rpc_argp       = &calldata->arg,
3250                 .rpc_resp       = &calldata->res,
3251                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3252         };
3253
3254         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3255                 return;
3256         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3257                 /* Note: exit _without_ running nfs4_locku_done */
3258                 task->tk_action = NULL;
3259                 return;
3260         }
3261         calldata->timestamp = jiffies;
3262         rpc_call_setup(task, &msg, 0);
3263 }
3264
3265 static const struct rpc_call_ops nfs4_locku_ops = {
3266         .rpc_call_prepare = nfs4_locku_prepare,
3267         .rpc_call_done = nfs4_locku_done,
3268         .rpc_release = nfs4_locku_release_calldata,
3269 };
3270
3271 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3272                 struct nfs_open_context *ctx,
3273                 struct nfs4_lock_state *lsp,
3274                 struct nfs_seqid *seqid)
3275 {
3276         struct nfs4_unlockdata *data;
3277
3278         /* Ensure this is an unlock - when canceling a lock, the
3279          * canceled lock is passed in, and it won't be an unlock.
3280          */
3281         fl->fl_type = F_UNLCK;
3282
3283         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3284         if (data == NULL) {
3285                 nfs_free_seqid(seqid);
3286                 return ERR_PTR(-ENOMEM);
3287         }
3288
3289         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3290 }
3291
3292 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3293 {
3294         struct nfs_seqid *seqid;
3295         struct nfs4_lock_state *lsp;
3296         struct rpc_task *task;
3297         int status = 0;
3298
3299         status = nfs4_set_lock_state(state, request);
3300         /* Unlock _before_ we do the RPC call */
3301         request->fl_flags |= FL_EXISTS;
3302         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3303                 goto out;
3304         if (status != 0)
3305                 goto out;
3306         /* Is this a delegated lock? */
3307         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3308                 goto out;
3309         lsp = request->fl_u.nfs4_fl.owner;
3310         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3311         status = -ENOMEM;
3312         if (seqid == NULL)
3313                 goto out;
3314         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3315         status = PTR_ERR(task);
3316         if (IS_ERR(task))
3317                 goto out;
3318         status = nfs4_wait_for_completion_rpc_task(task);
3319         rpc_put_task(task);
3320 out:
3321         return status;
3322 }
3323
3324 struct nfs4_lockdata {
3325         struct nfs_lock_args arg;
3326         struct nfs_lock_res res;
3327         struct nfs4_lock_state *lsp;
3328         struct nfs_open_context *ctx;
3329         struct file_lock fl;
3330         unsigned long timestamp;
3331         int rpc_status;
3332         int cancelled;
3333 };
3334
3335 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3336                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3337 {
3338         struct nfs4_lockdata *p;
3339         struct inode *inode = lsp->ls_state->inode;
3340         struct nfs_server *server = NFS_SERVER(inode);
3341
3342         p = kzalloc(sizeof(*p), GFP_KERNEL);
3343         if (p == NULL)
3344                 return NULL;
3345
3346         p->arg.fh = NFS_FH(inode);
3347         p->arg.fl = &p->fl;
3348         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3349         if (p->arg.lock_seqid == NULL)
3350                 goto out_free;
3351         p->arg.lock_stateid = &lsp->ls_stateid;
3352         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3353         p->arg.lock_owner.id = lsp->ls_id.id;
3354         p->lsp = lsp;
3355         atomic_inc(&lsp->ls_count);
3356         p->ctx = get_nfs_open_context(ctx);
3357         memcpy(&p->fl, fl, sizeof(p->fl));
3358         return p;
3359 out_free:
3360         kfree(p);
3361         return NULL;
3362 }
3363
3364 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3365 {
3366         struct nfs4_lockdata *data = calldata;
3367         struct nfs4_state *state = data->lsp->ls_state;
3368         struct nfs4_state_owner *sp = state->owner;
3369         struct rpc_message msg = {
3370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3371                 .rpc_argp = &data->arg,
3372                 .rpc_resp = &data->res,
3373                 .rpc_cred = sp->so_cred,
3374         };
3375
3376         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3377                 return;
3378         dprintk("%s: begin!\n", __FUNCTION__);
3379         /* Do we need to do an open_to_lock_owner? */
3380         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3381                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3382                 if (data->arg.open_seqid == NULL) {
3383                         data->rpc_status = -ENOMEM;
3384                         task->tk_action = NULL;
3385                         goto out;
3386                 }
3387                 data->arg.open_stateid = &state->stateid;
3388                 data->arg.new_lock_owner = 1;
3389         }
3390         data->timestamp = jiffies;
3391         rpc_call_setup(task, &msg, 0);
3392 out:
3393         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3394 }
3395
3396 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3397 {
3398         struct nfs4_lockdata *data = calldata;
3399
3400         dprintk("%s: begin!\n", __FUNCTION__);
3401
3402         data->rpc_status = task->tk_status;
3403         if (RPC_ASSASSINATED(task))
3404                 goto out;
3405         if (data->arg.new_lock_owner != 0) {
3406                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3407                 if (data->rpc_status == 0)
3408                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3409                 else
3410                         goto out;
3411         }
3412         if (data->rpc_status == 0) {
3413                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3414                                         sizeof(data->lsp->ls_stateid.data));
3415                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3416                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3417         }
3418         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3419 out:
3420         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3421 }
3422
3423 static void nfs4_lock_release(void *calldata)
3424 {
3425         struct nfs4_lockdata *data = calldata;
3426
3427         dprintk("%s: begin!\n", __FUNCTION__);
3428         if (data->arg.open_seqid != NULL)
3429                 nfs_free_seqid(data->arg.open_seqid);
3430         if (data->cancelled != 0) {
3431                 struct rpc_task *task;
3432                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3433                                 data->arg.lock_seqid);
3434                 if (!IS_ERR(task))
3435                         rpc_put_task(task);
3436                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3437         } else
3438                 nfs_free_seqid(data->arg.lock_seqid);
3439         nfs4_put_lock_state(data->lsp);
3440         put_nfs_open_context(data->ctx);
3441         kfree(data);
3442         dprintk("%s: done!\n", __FUNCTION__);
3443 }
3444
3445 static const struct rpc_call_ops nfs4_lock_ops = {
3446         .rpc_call_prepare = nfs4_lock_prepare,
3447         .rpc_call_done = nfs4_lock_done,
3448         .rpc_release = nfs4_lock_release,
3449 };
3450
3451 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3452 {
3453         struct nfs4_lockdata *data;
3454         struct rpc_task *task;
3455         int ret;
3456
3457         dprintk("%s: begin!\n", __FUNCTION__);
3458         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3459                         fl->fl_u.nfs4_fl.owner);
3460         if (data == NULL)
3461                 return -ENOMEM;
3462         if (IS_SETLKW(cmd))
3463                 data->arg.block = 1;
3464         if (reclaim != 0)
3465                 data->arg.reclaim = 1;
3466         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3467                         &nfs4_lock_ops, data);
3468         if (IS_ERR(task))
3469                 return PTR_ERR(task);
3470         ret = nfs4_wait_for_completion_rpc_task(task);
3471         if (ret == 0) {
3472                 ret = data->rpc_status;
3473                 if (ret == -NFS4ERR_DENIED)
3474                         ret = -EAGAIN;
3475         } else
3476                 data->cancelled = 1;
3477         rpc_put_task(task);
3478         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3479         return ret;
3480 }
3481
3482 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3483 {
3484         struct nfs_server *server = NFS_SERVER(state->inode);
3485         struct nfs4_exception exception = { };
3486         int err;
3487
3488         do {
3489                 /* Cache the lock if possible... */
3490                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3491                         return 0;
3492                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3493                 if (err != -NFS4ERR_DELAY)
3494                         break;
3495                 nfs4_handle_exception(server, err, &exception);
3496         } while (exception.retry);
3497         return err;
3498 }
3499
3500 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3501 {
3502         struct nfs_server *server = NFS_SERVER(state->inode);
3503         struct nfs4_exception exception = { };
3504         int err;
3505
3506         err = nfs4_set_lock_state(state, request);
3507         if (err != 0)
3508                 return err;
3509         do {
3510                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3511                         return 0;
3512                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3513                 if (err != -NFS4ERR_DELAY)
3514                         break;
3515                 nfs4_handle_exception(server, err, &exception);
3516         } while (exception.retry);
3517         return err;
3518 }
3519
3520 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3521 {
3522         struct nfs_client *clp = state->owner->so_client;
3523         unsigned char fl_flags = request->fl_flags;
3524         int status;
3525
3526         /* Is this a delegated open? */
3527         status = nfs4_set_lock_state(state, request);
3528         if (status != 0)
3529                 goto out;
3530         request->fl_flags |= FL_ACCESS;
3531         status = do_vfs_lock(request->fl_file, request);
3532         if (status < 0)
3533                 goto out;
3534         down_read(&clp->cl_sem);
3535         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3536                 struct nfs_inode *nfsi = NFS_I(state->inode);
3537                 /* Yes: cache locks! */
3538                 down_read(&nfsi->rwsem);
3539                 /* ...but avoid races with delegation recall... */
3540                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3541                         request->fl_flags = fl_flags & ~FL_SLEEP;
3542                         status = do_vfs_lock(request->fl_file, request);
3543                         up_read(&nfsi->rwsem);
3544                         goto out_unlock;
3545                 }
3546                 up_read(&nfsi->rwsem);
3547         }
3548         status = _nfs4_do_setlk(state, cmd, request, 0);
3549         if (status != 0)
3550                 goto out_unlock;
3551         /* Note: we always want to sleep here! */
3552         request->fl_flags = fl_flags | FL_SLEEP;
3553         if (do_vfs_lock(request->fl_file, request) < 0)
3554                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3555 out_unlock:
3556         up_read(&clp->cl_sem);
3557 out:
3558         request->fl_flags = fl_flags;
3559         return status;
3560 }
3561
3562 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3563 {
3564         struct nfs4_exception exception = { };
3565         int err;
3566
3567         do {
3568                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3569                                 _nfs4_proc_setlk(state, cmd, request),
3570                                 &exception);
3571         } while (exception.retry);
3572         return err;
3573 }
3574
3575 static int
3576 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3577 {
3578         struct nfs_open_context *ctx;
3579         struct nfs4_state *state;
3580         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3581         int status;
3582
3583         /* verify open state */
3584         ctx = (struct nfs_open_context *)filp->private_data;
3585         state = ctx->state;
3586
3587         if (request->fl_start < 0 || request->fl_end < 0)
3588                 return -EINVAL;
3589
3590         if (IS_GETLK(cmd))
3591                 return nfs4_proc_getlk(state, F_GETLK, request);
3592
3593         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3594                 return -EINVAL;
3595
3596         if (request->fl_type == F_UNLCK)
3597                 return nfs4_proc_unlck(state, cmd, request);
3598
3599         do {
3600                 status = nfs4_proc_setlk(state, cmd, request);
3601                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3602                         break;
3603                 timeout = nfs4_set_lock_task_retry(timeout);
3604                 status = -ERESTARTSYS;
3605                 if (signalled())
3606                         break;
3607         } while(status < 0);
3608         return status;
3609 }
3610
3611 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3612 {
3613         struct nfs_server *server = NFS_SERVER(state->inode);
3614         struct nfs4_exception exception = { };
3615         int err;
3616
3617         err = nfs4_set_lock_state(state, fl);
3618         if (err != 0)
3619                 goto out;
3620         do {
3621                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3622                 if (err != -NFS4ERR_DELAY)
3623                         break;
3624                 err = nfs4_handle_exception(server, err, &exception);
3625         } while (exception.retry);
3626 out:
3627         return err;
3628 }
3629
3630 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3631
3632 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3633                 size_t buflen, int flags)
3634 {
3635         struct inode *inode = dentry->d_inode;
3636
3637         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3638                 return -EOPNOTSUPP;
3639
3640         if (!S_ISREG(inode->i_mode) &&
3641             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3642                 return -EPERM;
3643
3644         return nfs4_proc_set_acl(inode, buf, buflen);
3645 }
3646
3647 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3648  * and that's what we'll do for e.g. user attributes that haven't been set.
3649  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3650  * attributes in kernel-managed attribute namespaces. */
3651 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3652                 size_t buflen)
3653 {
3654         struct inode *inode = dentry->d_inode;
3655
3656         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3657                 return -EOPNOTSUPP;
3658
3659         return nfs4_proc_get_acl(inode, buf, buflen);
3660 }
3661
3662 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3663 {
3664         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3665
3666         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3667                 return 0;
3668         if (buf && buflen < len)
3669                 return -ERANGE;
3670         if (buf)
3671                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3672         return len;
3673 }
3674
3675 int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
3676                 struct nfs4_fs_locations *fs_locations, struct page *page)
3677 {
3678         struct nfs_server *server = NFS_SERVER(dir);
3679         u32 bitmask[2] = {
3680                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3681                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3682         };
3683         struct nfs4_fs_locations_arg args = {
3684                 .dir_fh = NFS_FH(dir),
3685                 .name = name,
3686                 .page = page,
3687                 .bitmask = bitmask,
3688         };
3689         struct rpc_message msg = {
3690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3691                 .rpc_argp = &args,
3692                 .rpc_resp = fs_locations,
3693         };
3694         int status;
3695
3696         dprintk("%s: start\n", __FUNCTION__);
3697         nfs_fattr_init(&fs_locations->fattr);
3698         fs_locations->server = server;
3699         fs_locations->nlocations = 0;
3700         status = rpc_call_sync(server->client, &msg, 0);
3701         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3702         return status;
3703 }
3704
3705 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3706         .recover_open   = nfs4_open_reclaim,
3707         .recover_lock   = nfs4_lock_reclaim,
3708 };
3709
3710 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3711         .recover_open   = nfs4_open_expired,
3712         .recover_lock   = nfs4_lock_expired,
3713 };
3714
3715 static const struct inode_operations nfs4_file_inode_operations = {
3716         .permission     = nfs_permission,
3717         .getattr        = nfs_getattr,
3718         .setattr        = nfs_setattr,
3719         .getxattr       = nfs4_getxattr,
3720         .setxattr       = nfs4_setxattr,
3721         .listxattr      = nfs4_listxattr,
3722 };
3723
3724 const struct nfs_rpc_ops nfs_v4_clientops = {
3725         .version        = 4,                    /* protocol version */
3726         .dentry_ops     = &nfs4_dentry_operations,
3727         .dir_inode_ops  = &nfs4_dir_inode_operations,
3728         .file_inode_ops = &nfs4_file_inode_operations,
3729         .getroot        = nfs4_proc_get_root,
3730         .getattr        = nfs4_proc_getattr,
3731         .setattr        = nfs4_proc_setattr,
3732         .lookupfh       = nfs4_proc_lookupfh,
3733         .lookup         = nfs4_proc_lookup,
3734         .access         = nfs4_proc_access,
3735         .readlink       = nfs4_proc_readlink,
3736         .create         = nfs4_proc_create,
3737         .remove         = nfs4_proc_remove,
3738         .unlink_setup   = nfs4_proc_unlink_setup,
3739         .unlink_done    = nfs4_proc_unlink_done,
3740         .rename         = nfs4_proc_rename,
3741         .link           = nfs4_proc_link,
3742         .symlink        = nfs4_proc_symlink,
3743         .mkdir          = nfs4_proc_mkdir,
3744         .rmdir          = nfs4_proc_remove,
3745         .readdir        = nfs4_proc_readdir,
3746         .mknod          = nfs4_proc_mknod,
3747         .statfs         = nfs4_proc_statfs,
3748         .fsinfo         = nfs4_proc_fsinfo,
3749         .pathconf       = nfs4_proc_pathconf,
3750         .set_capabilities = nfs4_server_capabilities,
3751         .decode_dirent  = nfs4_decode_dirent,
3752         .read_setup     = nfs4_proc_read_setup,
3753         .read_done      = nfs4_read_done,
3754         .write_setup    = nfs4_proc_write_setup,
3755         .write_done     = nfs4_write_done,
3756         .commit_setup   = nfs4_proc_commit_setup,
3757         .commit_done    = nfs4_commit_done,
3758         .file_open      = nfs_open,
3759         .file_release   = nfs_release,
3760         .lock           = nfs4_proc_lock,
3761         .clear_acl_cache = nfs4_zap_acl_attr,
3762 };
3763
3764 /*
3765  * Local variables:
3766  *  c-basic-offset: 8
3767  * End:
3768  */