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 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  70 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  71
  72 /* Prevent leaks of NFSv4 errors into userland */
  73 int nfs4_map_errors(int err)
  74 {
  75         if (err < -1000) {
  76                 dprintk("%s could not handle NFSv4 error %d\n",
  77                                 __FUNCTION__, -err);
  78                 return -EIO;
  79         }
  80         return err;
  81 }
  82
  83 /*
  84  * This is our standard bitmap for GETATTR requests.
  85  */
  86 const u32 nfs4_fattr_bitmap[2] = {
  87         FATTR4_WORD0_TYPE
  88         | FATTR4_WORD0_CHANGE
  89         | FATTR4_WORD0_SIZE
  90         | FATTR4_WORD0_FSID
  91         | FATTR4_WORD0_FILEID,
  92         FATTR4_WORD1_MODE
  93         | FATTR4_WORD1_NUMLINKS
  94         | FATTR4_WORD1_OWNER
  95         | FATTR4_WORD1_OWNER_GROUP
  96         | FATTR4_WORD1_RAWDEV
  97         | FATTR4_WORD1_SPACE_USED
  98         | FATTR4_WORD1_TIME_ACCESS
  99         | FATTR4_WORD1_TIME_METADATA
 100         | FATTR4_WORD1_TIME_MODIFY
 101 };
 102
 103 const u32 nfs4_statfs_bitmap[2] = {
 104         FATTR4_WORD0_FILES_AVAIL
 105         | FATTR4_WORD0_FILES_FREE
 106         | FATTR4_WORD0_FILES_TOTAL,
 107         FATTR4_WORD1_SPACE_AVAIL
 108         | FATTR4_WORD1_SPACE_FREE
 109         | FATTR4_WORD1_SPACE_TOTAL
 110 };
 111
 112 const u32 nfs4_pathconf_bitmap[2] = {
 113         FATTR4_WORD0_MAXLINK
 114         | FATTR4_WORD0_MAXNAME,
 115         0
 116 };
 117
 118 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 119                         | FATTR4_WORD0_MAXREAD
 120                         | FATTR4_WORD0_MAXWRITE
 121                         | FATTR4_WORD0_LEASE_TIME,
 122                         0
 123 };
 124
 125 const u32 nfs4_fs_locations_bitmap[2] = {
 126         FATTR4_WORD0_TYPE
 127         | FATTR4_WORD0_CHANGE
 128         | FATTR4_WORD0_SIZE
 129         | FATTR4_WORD0_FSID
 130         | FATTR4_WORD0_FILEID
 131         | FATTR4_WORD0_FS_LOCATIONS,
 132         FATTR4_WORD1_MODE
 133         | FATTR4_WORD1_NUMLINKS
 134         | FATTR4_WORD1_OWNER
 135         | FATTR4_WORD1_OWNER_GROUP
 136         | FATTR4_WORD1_RAWDEV
 137         | FATTR4_WORD1_SPACE_USED
 138         | FATTR4_WORD1_TIME_ACCESS
 139         | FATTR4_WORD1_TIME_METADATA
 140         | FATTR4_WORD1_TIME_MODIFY
 141         | FATTR4_WORD1_MOUNTED_ON_FILEID
 142 };
 143
 144 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 145                 struct nfs4_readdir_arg *readdir)
 146 {
 147         __be32 *start, *p;
 148
 149         BUG_ON(readdir->count < 80);
 150         if (cookie > 2) {
 151                 readdir->cookie = cookie;
 152                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 153                 return;
 154         }
 155
 156         readdir->cookie = 0;
 157         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 158         if (cookie == 2)
 159                 return;
 160
 161         /*
 162          * NFSv4 servers do not return entries for '.' and '..'
 163          * Therefore, we fake these entries here.  We let '.'
 164          * have cookie 0 and '..' have cookie 1.  Note that
 165          * when talking to the server, we always send cookie 0
 166          * instead of 1 or 2.
 167          */
 168         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 169
 170         if (cookie == 0) {
 171                 *p++ = xdr_one;                                  /* next */
 172                 *p++ = xdr_zero;                   /* cookie, first word */
 173                 *p++ = xdr_one;                   /* cookie, second word */
 174                 *p++ = xdr_one;                             /* entry len */
 175                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 176                 p++;
 177                 *p++ = xdr_one;                         /* bitmap length */
 178                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 179                 *p++ = htonl(8);              /* attribute buffer length */
 180                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 181         }
 182
 183         *p++ = xdr_one;                                  /* next */
 184         *p++ = xdr_zero;                   /* cookie, first word */
 185         *p++ = xdr_two;                   /* cookie, second word */
 186         *p++ = xdr_two;                             /* entry len */
 187         memcpy(p, "..\0\0", 4);                         /* entry */
 188         p++;
 189         *p++ = xdr_one;                         /* bitmap length */
 190         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 191         *p++ = htonl(8);              /* attribute buffer length */
 192         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 193
 194         readdir->pgbase = (char *)p - (char *)start;
 195         readdir->count -= readdir->pgbase;
 196         kunmap_atomic(start, KM_USER0);
 197 }
 198
 199 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 200 {
 201         struct nfs_client *clp = server->nfs_client;
 202         spin_lock(&clp->cl_lock);
 203         if (time_before(clp->cl_last_renewal,timestamp))
 204                 clp->cl_last_renewal = timestamp;
 205         spin_unlock(&clp->cl_lock);
 206 }
 207
 208 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 209 {
 210         struct nfs_inode *nfsi = NFS_I(dir);
 211
 212         spin_lock(&dir->i_lock);
 213         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 214         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 215                 nfsi->change_attr = cinfo->after;
 216         spin_unlock(&dir->i_lock);
 217 }
 218
 219 struct nfs4_opendata {
 220         struct kref kref;
 221         struct nfs_openargs o_arg;
 222         struct nfs_openres o_res;
 223         struct nfs_open_confirmargs c_arg;
 224         struct nfs_open_confirmres c_res;
 225         struct nfs_fattr f_attr;
 226         struct nfs_fattr dir_attr;
 227         struct path path;
 228         struct dentry *dir;
 229         struct nfs4_state_owner *owner;
 230         struct nfs4_state *state;
 231         struct iattr attrs;
 232         unsigned long timestamp;
 233         unsigned int rpc_done : 1;
 234         int rpc_status;
 235         int cancelled;
 236 };
 237
 238
 239 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 240 {
 241         p->o_res.f_attr = &p->f_attr;
 242         p->o_res.dir_attr = &p->dir_attr;
 243         p->o_res.server = p->o_arg.server;
 244         nfs_fattr_init(&p->f_attr);
 245         nfs_fattr_init(&p->dir_attr);
 246 }
 247
 248 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 249                 struct nfs4_state_owner *sp, int flags,
 250                 const struct iattr *attrs)
 251 {
 252         struct dentry *parent = dget_parent(path->dentry);
 253         struct inode *dir = parent->d_inode;
 254         struct nfs_server *server = NFS_SERVER(dir);
 255         struct nfs4_opendata *p;
 256
 257         p = kzalloc(sizeof(*p), GFP_KERNEL);
 258         if (p == NULL)
 259                 goto err;
 260         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 261         if (p->o_arg.seqid == NULL)
 262                 goto err_free;
 263         p->path.mnt = mntget(path->mnt);
 264         p->path.dentry = dget(path->dentry);
 265         p->dir = parent;
 266         p->owner = sp;
 267         atomic_inc(&sp->so_count);
 268         p->o_arg.fh = NFS_FH(dir);
 269         p->o_arg.open_flags = flags,
 270         p->o_arg.clientid = server->nfs_client->cl_clientid;
 271         p->o_arg.id = sp->so_owner_id.id;
 272         p->o_arg.name = &p->path.dentry->d_name;
 273         p->o_arg.server = server;
 274         p->o_arg.bitmask = server->attr_bitmask;
 275         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 276         if (flags & O_EXCL) {
 277                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 278                 s[0] = jiffies;
 279                 s[1] = current->pid;
 280         } else if (flags & O_CREAT) {
 281                 p->o_arg.u.attrs = &p->attrs;
 282                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 283         }
 284         p->c_arg.fh = &p->o_res.fh;
 285         p->c_arg.stateid = &p->o_res.stateid;
 286         p->c_arg.seqid = p->o_arg.seqid;
 287         nfs4_init_opendata_res(p);
 288         kref_init(&p->kref);
 289         return p;
 290 err_free:
 291         kfree(p);
 292 err:
 293         dput(parent);
 294         return NULL;
 295 }
 296
 297 static void nfs4_opendata_free(struct kref *kref)
 298 {
 299         struct nfs4_opendata *p = container_of(kref,
 300                         struct nfs4_opendata, kref);
 301
 302         nfs_free_seqid(p->o_arg.seqid);
 303         if (p->state != NULL)
 304                 nfs4_put_open_state(p->state);
 305         nfs4_put_state_owner(p->owner);
 306         dput(p->dir);
 307         dput(p->path.dentry);
 308         mntput(p->path.mnt);
 309         kfree(p);
 310 }
 311
 312 static void nfs4_opendata_put(struct nfs4_opendata *p)
 313 {
 314         if (p != NULL)
 315                 kref_put(&p->kref, nfs4_opendata_free);
 316 }
 317
 318 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 319 {
 320         sigset_t oldset;
 321         int ret;
 322
 323         rpc_clnt_sigmask(task->tk_client, &oldset);
 324         ret = rpc_wait_for_completion_task(task);
 325         rpc_clnt_sigunmask(task->tk_client, &oldset);
 326         return ret;
 327 }
 328
 329 static int can_open_cached(struct nfs4_state *state, int mode)
 330 {
 331         int ret = 0;
 332         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 333                 case FMODE_READ:
 334                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 335                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 336                         break;
 337                 case FMODE_WRITE:
 338                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 339                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 340                         break;
 341                 case FMODE_READ|FMODE_WRITE:
 342                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 343         }
 344         return ret;
 345 }
 346
 347 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 348 {
 349         if ((delegation->type & open_flags) != open_flags)
 350                 return 0;
 351         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 352                 return 0;
 353         return 1;
 354 }
 355
 356 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 357 {
 358         switch (open_flags) {
 359                 case FMODE_WRITE:
 360                         state->n_wronly++;
 361                         break;
 362                 case FMODE_READ:
 363                         state->n_rdonly++;
 364                         break;
 365                 case FMODE_READ|FMODE_WRITE:
 366                         state->n_rdwr++;
 367         }
 368         nfs4_state_set_mode_locked(state, state->state | open_flags);
 369 }
 370
 371 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 372 {
 373         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 374                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 375         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 376         switch (open_flags) {
 377                 case FMODE_READ:
 378                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 379                         break;
 380                 case FMODE_WRITE:
 381                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 382                         break;
 383                 case FMODE_READ|FMODE_WRITE:
 384                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 385         }
 386 }
 387
 388 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 389 {
 390         write_seqlock(&state->seqlock);
 391         nfs_set_open_stateid_locked(state, stateid, open_flags);
 392         write_sequnlock(&state->seqlock);
 393 }
 394
 395 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 396 {
 397         open_flags &= (FMODE_READ|FMODE_WRITE);
 398         /*
 399          * Protect the call to nfs4_state_set_mode_locked and
 400          * serialise the stateid update
 401          */
 402         write_seqlock(&state->seqlock);
 403         if (deleg_stateid != NULL) {
 404                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 405                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 406         }
 407         if (open_stateid != NULL)
 408                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 409         write_sequnlock(&state->seqlock);
 410         spin_lock(&state->owner->so_lock);
 411         update_open_stateflags(state, open_flags);
 412         spin_unlock(&state->owner->so_lock);
 413 }
 414
 415 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 416 {
 417         struct nfs_delegation *delegation;
 418
 419         rcu_read_lock();
 420         delegation = rcu_dereference(NFS_I(inode)->delegation);
 421         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 422                 rcu_read_unlock();
 423                 return;
 424         }
 425         rcu_read_unlock();
 426         nfs_inode_return_delegation(inode);
 427 }
 428
 429 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 430 {
 431         struct nfs4_state *state = opendata->state;
 432         struct nfs_inode *nfsi = NFS_I(state->inode);
 433         struct nfs_delegation *delegation;
 434         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 435         nfs4_stateid stateid;
 436         int ret = -EAGAIN;
 437
 438         rcu_read_lock();
 439         delegation = rcu_dereference(nfsi->delegation);
 440         for (;;) {
 441                 if (can_open_cached(state, open_mode)) {
 442                         spin_lock(&state->owner->so_lock);
 443                         if (can_open_cached(state, open_mode)) {
 444                                 update_open_stateflags(state, open_mode);
 445                                 spin_unlock(&state->owner->so_lock);
 446                                 rcu_read_unlock();
 447                                 goto out_return_state;
 448                         }
 449                         spin_unlock(&state->owner->so_lock);
 450                 }
 451                 if (delegation == NULL)
 452                         break;
 453                 if (!can_open_delegated(delegation, open_mode))
 454                         break;
 455                 /* Save the delegation */
 456                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 457                 rcu_read_unlock();
 458                 lock_kernel();
 459                 ret = _nfs4_do_access(state->inode, state->owner->so_cred, open_mode);
 460                 unlock_kernel();
 461                 if (ret != 0)
 462                         goto out;
 463                 ret = -EAGAIN;
 464                 rcu_read_lock();
 465                 delegation = rcu_dereference(nfsi->delegation);
 466                 /* If no delegation, try a cached open */
 467                 if (delegation == NULL)
 468                         continue;
 469                 /* Is the delegation still valid? */
 470                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 471                         continue;
 472                 rcu_read_unlock();
 473                 update_open_stateid(state, NULL, &stateid, open_mode);
 474                 goto out_return_state;
 475         }
 476         rcu_read_unlock();
 477 out:
 478         return ERR_PTR(ret);
 479 out_return_state:
 480         atomic_inc(&state->count);
 481         return state;
 482 }
 483
 484 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 485 {
 486         struct inode *inode;
 487         struct nfs4_state *state = NULL;
 488         struct nfs_delegation *delegation;
 489         nfs4_stateid *deleg_stateid = NULL;
 490         int ret;
 491
 492         if (!data->rpc_done) {
 493                 state = nfs4_try_open_cached(data);
 494                 goto out;
 495         }
 496
 497         ret = -EAGAIN;
 498         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 499                 goto err;
 500         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 501         ret = PTR_ERR(inode);
 502         if (IS_ERR(inode))
 503                 goto err;
 504         ret = -ENOMEM;
 505         state = nfs4_get_open_state(inode, data->owner);
 506         if (state == NULL)
 507                 goto err_put_inode;
 508         if (data->o_res.delegation_type != 0) {
 509                 int delegation_flags = 0;
 510
 511                 rcu_read_lock();
 512                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 513                 if (delegation)
 514                         delegation_flags = delegation->flags;
 515                 rcu_read_unlock();
 516                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 517                         nfs_inode_set_delegation(state->inode,
 518                                         data->owner->so_cred,
 519                                         &data->o_res);
 520                 else
 521                         nfs_inode_reclaim_delegation(state->inode,
 522                                         data->owner->so_cred,
 523                                         &data->o_res);
 524         }
 525         rcu_read_lock();
 526         delegation = rcu_dereference(NFS_I(inode)->delegation);
 527         if (delegation != NULL)
 528                 deleg_stateid = &delegation->stateid;
 529         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 530         rcu_read_unlock();
 531         iput(inode);
 532 out:
 533         return state;
 534 err_put_inode:
 535         iput(inode);
 536 err:
 537         return ERR_PTR(ret);
 538 }
 539
 540 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 541 {
 542         struct nfs_inode *nfsi = NFS_I(state->inode);
 543         struct nfs_open_context *ctx;
 544
 545         spin_lock(&state->inode->i_lock);
 546         list_for_each_entry(ctx, &nfsi->open_files, list) {
 547                 if (ctx->state != state)
 548                         continue;
 549                 get_nfs_open_context(ctx);
 550                 spin_unlock(&state->inode->i_lock);
 551                 return ctx;
 552         }
 553         spin_unlock(&state->inode->i_lock);
 554         return ERR_PTR(-ENOENT);
 555 }
 556
 557 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 558 {
 559         struct nfs4_opendata *opendata;
 560
 561         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 562         if (opendata == NULL)
 563                 return ERR_PTR(-ENOMEM);
 564         opendata->state = state;
 565         atomic_inc(&state->count);
 566         return opendata;
 567 }
 568
 569 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 570 {
 571         struct nfs4_state *newstate;
 572         int ret;
 573
 574         opendata->o_arg.open_flags = openflags;
 575         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 576         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 577         nfs4_init_opendata_res(opendata);
 578         ret = _nfs4_proc_open(opendata);
 579         if (ret != 0)
 580                 return ret;
 581         newstate = nfs4_opendata_to_nfs4_state(opendata);
 582         if (IS_ERR(newstate))
 583                 return PTR_ERR(newstate);
 584         nfs4_close_state(&opendata->path, newstate, openflags);
 585         *res = newstate;
 586         return 0;
 587 }
 588
 589 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 590 {
 591         struct nfs4_state *newstate;
 592         int ret;
 593
 594         /* memory barrier prior to reading state->n_* */
 595         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 596         smp_rmb();
 597         if (state->n_rdwr != 0) {
 598                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 599                 if (ret != 0)
 600                         return ret;
 601                 if (newstate != state)
 602                         return -ESTALE;
 603         }
 604         if (state->n_wronly != 0) {
 605                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 606                 if (ret != 0)
 607                         return ret;
 608                 if (newstate != state)
 609                         return -ESTALE;
 610         }
 611         if (state->n_rdonly != 0) {
 612                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 613                 if (ret != 0)
 614                         return ret;
 615                 if (newstate != state)
 616                         return -ESTALE;
 617         }
 618         /*
 619          * We may have performed cached opens for all three recoveries.
 620          * Check if we need to update the current stateid.
 621          */
 622         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 623             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 624                 write_seqlock(&state->seqlock);
 625                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 626                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 627                 write_sequnlock(&state->seqlock);
 628         }
 629         return 0;
 630 }
 631
 632 /*
 633  * OPEN_RECLAIM:
 634  *      reclaim state on the server after a reboot.
 635  */
 636 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 637 {
 638         struct nfs_delegation *delegation;
 639         struct nfs4_opendata *opendata;
 640         int delegation_type = 0;
 641         int status;
 642
 643         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 644         if (IS_ERR(opendata))
 645                 return PTR_ERR(opendata);
 646         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 647         opendata->o_arg.fh = NFS_FH(state->inode);
 648         rcu_read_lock();
 649         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 650         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 651                 delegation_type = delegation->flags;
 652         rcu_read_unlock();
 653         opendata->o_arg.u.delegation_type = delegation_type;
 654         status = nfs4_open_recover(opendata, state);
 655         nfs4_opendata_put(opendata);
 656         return status;
 657 }
 658
 659 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 660 {
 661         struct nfs_server *server = NFS_SERVER(state->inode);
 662         struct nfs4_exception exception = { };
 663         int err;
 664         do {
 665                 err = _nfs4_do_open_reclaim(ctx, state);
 666                 if (err != -NFS4ERR_DELAY)
 667                         break;
 668                 nfs4_handle_exception(server, err, &exception);
 669         } while (exception.retry);
 670         return err;
 671 }
 672
 673 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 674 {
 675         struct nfs_open_context *ctx;
 676         int ret;
 677
 678         ctx = nfs4_state_find_open_context(state);
 679         if (IS_ERR(ctx))
 680                 return PTR_ERR(ctx);
 681         ret = nfs4_do_open_reclaim(ctx, state);
 682         put_nfs_open_context(ctx);
 683         return ret;
 684 }
 685
 686 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 687 {
 688         struct nfs4_opendata *opendata;
 689         int ret;
 690
 691         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 692         if (IS_ERR(opendata))
 693                 return PTR_ERR(opendata);
 694         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 695         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 696                         sizeof(opendata->o_arg.u.delegation.data));
 697         ret = nfs4_open_recover(opendata, state);
 698         nfs4_opendata_put(opendata);
 699         return ret;
 700 }
 701
 702 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 703 {
 704         struct nfs4_exception exception = { };
 705         struct nfs_server *server = NFS_SERVER(state->inode);
 706         int err;
 707         do {
 708                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 709                 switch (err) {
 710                         case 0:
 711                                 return err;
 712                         case -NFS4ERR_STALE_CLIENTID:
 713                         case -NFS4ERR_STALE_STATEID:
 714                         case -NFS4ERR_EXPIRED:
 715                                 /* Don't recall a delegation if it was lost */
 716                                 nfs4_schedule_state_recovery(server->nfs_client);
 717                                 return err;
 718                 }
 719                 err = nfs4_handle_exception(server, err, &exception);
 720         } while (exception.retry);
 721         return err;
 722 }
 723
 724 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 725 {
 726         struct nfs4_opendata *data = calldata;
 727         struct  rpc_message msg = {
 728                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 729                 .rpc_argp = &data->c_arg,
 730                 .rpc_resp = &data->c_res,
 731                 .rpc_cred = data->owner->so_cred,
 732         };
 733         data->timestamp = jiffies;
 734         rpc_call_setup(task, &msg, 0);
 735 }
 736
 737 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 738 {
 739         struct nfs4_opendata *data = calldata;
 740
 741         data->rpc_status = task->tk_status;
 742         if (RPC_ASSASSINATED(task))
 743                 return;
 744         if (data->rpc_status == 0) {
 745                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 746                                 sizeof(data->o_res.stateid.data));
 747                 renew_lease(data->o_res.server, data->timestamp);
 748                 data->rpc_done = 1;
 749         }
 750         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 751         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 752 }
 753
 754 static void nfs4_open_confirm_release(void *calldata)
 755 {
 756         struct nfs4_opendata *data = calldata;
 757         struct nfs4_state *state = NULL;
 758
 759         /* If this request hasn't been cancelled, do nothing */
 760         if (data->cancelled == 0)
 761                 goto out_free;
 762         /* In case of error, no cleanup! */
 763         if (!data->rpc_done)
 764                 goto out_free;
 765         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 766         state = nfs4_opendata_to_nfs4_state(data);
 767         if (!IS_ERR(state))
 768                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 769 out_free:
 770         nfs4_opendata_put(data);
 771 }
 772
 773 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 774         .rpc_call_prepare = nfs4_open_confirm_prepare,
 775         .rpc_call_done = nfs4_open_confirm_done,
 776         .rpc_release = nfs4_open_confirm_release,
 777 };
 778
 779 /*
 780  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 781  */
 782 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 783 {
 784         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 785         struct rpc_task *task;
 786         int status;
 787
 788         kref_get(&data->kref);
 789         data->rpc_done = 0;
 790         data->rpc_status = 0;
 791         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 792         if (IS_ERR(task))
 793                 return PTR_ERR(task);
 794         status = nfs4_wait_for_completion_rpc_task(task);
 795         if (status != 0) {
 796                 data->cancelled = 1;
 797                 smp_wmb();
 798         } else
 799                 status = data->rpc_status;
 800         rpc_put_task(task);
 801         return status;
 802 }
 803
 804 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 805 {
 806         struct nfs4_opendata *data = calldata;
 807         struct nfs4_state_owner *sp = data->owner;
 808         struct rpc_message msg = {
 809                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 810                 .rpc_argp = &data->o_arg,
 811                 .rpc_resp = &data->o_res,
 812                 .rpc_cred = sp->so_cred,
 813         };
 814
 815         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 816                 return;
 817         /*
 818          * Check if we still need to send an OPEN call, or if we can use
 819          * a delegation instead.
 820          */
 821         if (data->state != NULL) {
 822                 struct nfs_delegation *delegation;
 823
 824                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 825                         goto out_no_action;
 826                 rcu_read_lock();
 827                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 828                 if (delegation != NULL &&
 829                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 830                         rcu_read_unlock();
 831                         goto out_no_action;
 832                 }
 833                 rcu_read_unlock();
 834         }
 835         /* Update sequence id. */
 836         data->o_arg.id = sp->so_owner_id.id;
 837         data->o_arg.clientid = sp->so_client->cl_clientid;
 838         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 839                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 840                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 841         }
 842         data->timestamp = jiffies;
 843         rpc_call_setup(task, &msg, 0);
 844         return;
 845 out_no_action:
 846         task->tk_action = NULL;
 847
 848 }
 849
 850 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 851 {
 852         struct nfs4_opendata *data = calldata;
 853
 854         data->rpc_status = task->tk_status;
 855         if (RPC_ASSASSINATED(task))
 856                 return;
 857         if (task->tk_status == 0) {
 858                 switch (data->o_res.f_attr->mode & S_IFMT) {
 859                         case S_IFREG:
 860                                 break;
 861                         case S_IFLNK:
 862                                 data->rpc_status = -ELOOP;
 863                                 break;
 864                         case S_IFDIR:
 865                                 data->rpc_status = -EISDIR;
 866                                 break;
 867                         default:
 868                                 data->rpc_status = -ENOTDIR;
 869                 }
 870                 renew_lease(data->o_res.server, data->timestamp);
 871                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 872                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 873         }
 874         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 875         data->rpc_done = 1;
 876 }
 877
 878 static void nfs4_open_release(void *calldata)
 879 {
 880         struct nfs4_opendata *data = calldata;
 881         struct nfs4_state *state = NULL;
 882
 883         /* If this request hasn't been cancelled, do nothing */
 884         if (data->cancelled == 0)
 885                 goto out_free;
 886         /* In case of error, no cleanup! */
 887         if (data->rpc_status != 0 || !data->rpc_done)
 888                 goto out_free;
 889         /* In case we need an open_confirm, no cleanup! */
 890         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 891                 goto out_free;
 892         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 893         state = nfs4_opendata_to_nfs4_state(data);
 894         if (!IS_ERR(state))
 895                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 896 out_free:
 897         nfs4_opendata_put(data);
 898 }
 899
 900 static const struct rpc_call_ops nfs4_open_ops = {
 901         .rpc_call_prepare = nfs4_open_prepare,
 902         .rpc_call_done = nfs4_open_done,
 903         .rpc_release = nfs4_open_release,
 904 };
 905
 906 /*
 907  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 908  */
 909 static int _nfs4_proc_open(struct nfs4_opendata *data)
 910 {
 911         struct inode *dir = data->dir->d_inode;
 912         struct nfs_server *server = NFS_SERVER(dir);
 913         struct nfs_openargs *o_arg = &data->o_arg;
 914         struct nfs_openres *o_res = &data->o_res;
 915         struct rpc_task *task;
 916         int status;
 917
 918         kref_get(&data->kref);
 919         data->rpc_done = 0;
 920         data->rpc_status = 0;
 921         data->cancelled = 0;
 922         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 923         if (IS_ERR(task))
 924                 return PTR_ERR(task);
 925         status = nfs4_wait_for_completion_rpc_task(task);
 926         if (status != 0) {
 927                 data->cancelled = 1;
 928                 smp_wmb();
 929         } else
 930                 status = data->rpc_status;
 931         rpc_put_task(task);
 932         if (status != 0 || !data->rpc_done)
 933                 return status;
 934
 935         if (o_res->fh.size == 0)
 936                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 937
 938         if (o_arg->open_flags & O_CREAT) {
 939                 update_changeattr(dir, &o_res->cinfo);
 940                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 941         } else
 942                 nfs_refresh_inode(dir, o_res->dir_attr);
 943         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 944                 status = _nfs4_proc_open_confirm(data);
 945                 if (status != 0)
 946                         return status;
 947         }
 948         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 949                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 950         return 0;
 951 }
 952
 953 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 954 {
 955         struct nfs_access_entry cache;
 956         int mask = 0;
 957         int status;
 958
 959         if (openflags & FMODE_READ)
 960                 mask |= MAY_READ;
 961         if (openflags & FMODE_WRITE)
 962                 mask |= MAY_WRITE;
 963         if (openflags & FMODE_EXEC)
 964                 mask |= MAY_EXEC;
 965         status = nfs_access_get_cached(inode, cred, &cache);
 966         if (status == 0)
 967                 goto out;
 968
 969         /* Be clever: ask server to check for all possible rights */
 970         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 971         cache.cred = cred;
 972         cache.jiffies = jiffies;
 973         status = _nfs4_proc_access(inode, &cache);
 974         if (status != 0)
 975                 return status;
 976         nfs_access_add_cache(inode, &cache);
 977 out:
 978         if ((cache.mask & mask) == mask)
 979                 return 0;
 980         return -EACCES;
 981 }
 982
 983 static int nfs4_recover_expired_lease(struct nfs_server *server)
 984 {
 985         struct nfs_client *clp = server->nfs_client;
 986         int ret;
 987
 988         for (;;) {
 989                 ret = nfs4_wait_clnt_recover(server->client, clp);
 990                 if (ret != 0)
 991                         return ret;
 992                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 993                         break;
 994                 nfs4_schedule_state_recovery(clp);
 995         }
 996         return 0;
 997 }
 998
 999 /*
1000  * OPEN_EXPIRED:
1001  *      reclaim state on the server after a network partition.
1002  *      Assumes caller holds the appropriate lock
1003  */
1004 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1005 {
1006         struct nfs4_opendata *opendata;
1007         int ret;
1008
1009         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1010         if (IS_ERR(opendata))
1011                 return PTR_ERR(opendata);
1012         ret = nfs4_open_recover(opendata, state);
1013         if (ret == -ESTALE) {
1014                 /* Invalidate the state owner so we don't ever use it again */
1015                 nfs4_drop_state_owner(state->owner);
1016                 d_drop(ctx->path.dentry);
1017         }
1018         nfs4_opendata_put(opendata);
1019         return ret;
1020 }
1021
1022 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1023 {
1024         struct nfs_server *server = NFS_SERVER(state->inode);
1025         struct nfs4_exception exception = { };
1026         int err;
1027
1028         do {
1029                 err = _nfs4_open_expired(ctx, state);
1030                 if (err == -NFS4ERR_DELAY)
1031                         nfs4_handle_exception(server, err, &exception);
1032         } while (exception.retry);
1033         return err;
1034 }
1035
1036 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1037 {
1038         struct nfs_open_context *ctx;
1039         int ret;
1040
1041         ctx = nfs4_state_find_open_context(state);
1042         if (IS_ERR(ctx))
1043                 return PTR_ERR(ctx);
1044         ret = nfs4_do_open_expired(ctx, state);
1045         put_nfs_open_context(ctx);
1046         return ret;
1047 }
1048
1049 /*
1050  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1051  * fields corresponding to attributes that were used to store the verifier.
1052  * Make sure we clobber those fields in the later setattr call
1053  */
1054 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1055 {
1056         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1057             !(sattr->ia_valid & ATTR_ATIME_SET))
1058                 sattr->ia_valid |= ATTR_ATIME;
1059
1060         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1061             !(sattr->ia_valid & ATTR_MTIME_SET))
1062                 sattr->ia_valid |= ATTR_MTIME;
1063 }
1064
1065 /*
1066  * Returns a referenced nfs4_state
1067  */
1068 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1069 {
1070         struct nfs4_state_owner  *sp;
1071         struct nfs4_state     *state = NULL;
1072         struct nfs_server       *server = NFS_SERVER(dir);
1073         struct nfs_client *clp = server->nfs_client;
1074         struct nfs4_opendata *opendata;
1075         int status;
1076
1077         /* Protect against reboot recovery conflicts */
1078         status = -ENOMEM;
1079         if (!(sp = nfs4_get_state_owner(server, cred))) {
1080                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1081                 goto out_err;
1082         }
1083         status = nfs4_recover_expired_lease(server);
1084         if (status != 0)
1085                 goto err_put_state_owner;
1086         if (path->dentry->d_inode != NULL)
1087                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1088         down_read(&clp->cl_sem);
1089         status = -ENOMEM;
1090         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1091         if (opendata == NULL)
1092                 goto err_release_rwsem;
1093
1094         if (path->dentry->d_inode != NULL)
1095                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1096
1097         status = _nfs4_proc_open(opendata);
1098         if (status != 0)
1099                 goto err_opendata_put;
1100
1101         if (opendata->o_arg.open_flags & O_EXCL)
1102                 nfs4_exclusive_attrset(opendata, sattr);
1103
1104         state = nfs4_opendata_to_nfs4_state(opendata);
1105         status = PTR_ERR(state);
1106         if (IS_ERR(state))
1107                 goto err_opendata_put;
1108         nfs4_opendata_put(opendata);
1109         nfs4_put_state_owner(sp);
1110         up_read(&clp->cl_sem);
1111         *res = state;
1112         return 0;
1113 err_opendata_put:
1114         nfs4_opendata_put(opendata);
1115 err_release_rwsem:
1116         up_read(&clp->cl_sem);
1117 err_put_state_owner:
1118         nfs4_put_state_owner(sp);
1119 out_err:
1120         *res = NULL;
1121         return status;
1122 }
1123
1124
1125 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1126 {
1127         struct nfs4_exception exception = { };
1128         struct nfs4_state *res;
1129         int status;
1130
1131         do {
1132                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1133                 if (status == 0)
1134                         break;
1135                 /* NOTE: BAD_SEQID means the server and client disagree about the
1136                  * book-keeping w.r.t. state-changing operations
1137                  * (OPEN/CLOSE/LOCK/LOCKU...)
1138                  * It is actually a sign of a bug on the client or on the server.
1139                  *
1140                  * If we receive a BAD_SEQID error in the particular case of
1141                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1142                  * have unhashed the old state_owner for us, and that we can
1143                  * therefore safely retry using a new one. We should still warn
1144                  * the user though...
1145                  */
1146                 if (status == -NFS4ERR_BAD_SEQID) {
1147                         printk(KERN_WARNING "NFS: v4 server %s "
1148                                         " returned a bad sequence-id error!\n",
1149                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1150                         exception.retry = 1;
1151                         continue;
1152                 }
1153                 /*
1154                  * BAD_STATEID on OPEN means that the server cancelled our
1155                  * state before it received the OPEN_CONFIRM.
1156                  * Recover by retrying the request as per the discussion
1157                  * on Page 181 of RFC3530.
1158                  */
1159                 if (status == -NFS4ERR_BAD_STATEID) {
1160                         exception.retry = 1;
1161                         continue;
1162                 }
1163                 if (status == -EAGAIN) {
1164                         /* We must have found a delegation */
1165                         exception.retry = 1;
1166                         continue;
1167                 }
1168                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1169                                         status, &exception));
1170         } while (exception.retry);
1171         return res;
1172 }
1173
1174 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1175                 struct iattr *sattr, struct nfs4_state *state)
1176 {
1177         struct nfs_server *server = NFS_SERVER(inode);
1178         struct nfs_setattrargs  arg = {
1179                 .fh             = NFS_FH(inode),
1180                 .iap            = sattr,
1181                 .server         = server,
1182                 .bitmask = server->attr_bitmask,
1183         };
1184         struct nfs_setattrres  res = {
1185                 .fattr          = fattr,
1186                 .server         = server,
1187         };
1188         struct rpc_message msg = {
1189                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1190                 .rpc_argp       = &arg,
1191                 .rpc_resp       = &res,
1192         };
1193         unsigned long timestamp = jiffies;
1194         int status;
1195
1196         nfs_fattr_init(fattr);
1197
1198         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1199                 /* Use that stateid */
1200         } else if (state != NULL) {
1201                 msg.rpc_cred = state->owner->so_cred;
1202                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1203         } else
1204                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1205
1206         status = rpc_call_sync(server->client, &msg, 0);
1207         if (status == 0 && state != NULL)
1208                 renew_lease(server, timestamp);
1209         return status;
1210 }
1211
1212 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1213                 struct iattr *sattr, struct nfs4_state *state)
1214 {
1215         struct nfs_server *server = NFS_SERVER(inode);
1216         struct nfs4_exception exception = { };
1217         int err;
1218         do {
1219                 err = nfs4_handle_exception(server,
1220                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1221                                 &exception);
1222         } while (exception.retry);
1223         return err;
1224 }
1225
1226 struct nfs4_closedata {
1227         struct path path;
1228         struct inode *inode;
1229         struct nfs4_state *state;
1230         struct nfs_closeargs arg;
1231         struct nfs_closeres res;
1232         struct nfs_fattr fattr;
1233         unsigned long timestamp;
1234 };
1235
1236 static void nfs4_free_closedata(void *data)
1237 {
1238         struct nfs4_closedata *calldata = data;
1239         struct nfs4_state_owner *sp = calldata->state->owner;
1240
1241         nfs4_put_open_state(calldata->state);
1242         nfs_free_seqid(calldata->arg.seqid);
1243         nfs4_put_state_owner(sp);
1244         dput(calldata->path.dentry);
1245         mntput(calldata->path.mnt);
1246         kfree(calldata);
1247 }
1248
1249 static void nfs4_close_done(struct rpc_task *task, void *data)
1250 {
1251         struct nfs4_closedata *calldata = data;
1252         struct nfs4_state *state = calldata->state;
1253         struct nfs_server *server = NFS_SERVER(calldata->inode);
1254
1255         if (RPC_ASSASSINATED(task))
1256                 return;
1257         /* hmm. we are done with the inode, and in the process of freeing
1258          * the state_owner. we keep this around to process errors
1259          */
1260         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1261         switch (task->tk_status) {
1262                 case 0:
1263                         nfs_set_open_stateid(state, &calldata->res.stateid, calldata->arg.open_flags);
1264                         renew_lease(server, calldata->timestamp);
1265                         break;
1266                 case -NFS4ERR_STALE_STATEID:
1267                 case -NFS4ERR_EXPIRED:
1268                         break;
1269                 default:
1270                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1271                                 rpc_restart_call(task);
1272                                 return;
1273                         }
1274         }
1275         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1276 }
1277
1278 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1279 {
1280         struct nfs4_closedata *calldata = data;
1281         struct nfs4_state *state = calldata->state;
1282         struct rpc_message msg = {
1283                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1284                 .rpc_argp = &calldata->arg,
1285                 .rpc_resp = &calldata->res,
1286                 .rpc_cred = state->owner->so_cred,
1287         };
1288         int clear_rd, clear_wr, clear_rdwr;
1289         int mode;
1290
1291         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1292                 return;
1293
1294         mode = FMODE_READ|FMODE_WRITE;
1295         clear_rd = clear_wr = clear_rdwr = 0;
1296         spin_lock(&state->owner->so_lock);
1297         /* Calculate the change in open mode */
1298         if (state->n_rdwr == 0) {
1299                 if (state->n_rdonly == 0) {
1300                         mode &= ~FMODE_READ;
1301                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1302                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1303                 }
1304                 if (state->n_wronly == 0) {
1305                         mode &= ~FMODE_WRITE;
1306                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1307                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1308                 }
1309         }
1310         spin_unlock(&state->owner->so_lock);
1311         if (!clear_rd && !clear_wr && !clear_rdwr) {
1312                 /* Note: exit _without_ calling nfs4_close_done */
1313                 task->tk_action = NULL;
1314                 return;
1315         }
1316         nfs_fattr_init(calldata->res.fattr);
1317         if (mode != 0)
1318                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1319         calldata->arg.open_flags = mode;
1320         calldata->timestamp = jiffies;
1321         rpc_call_setup(task, &msg, 0);
1322 }
1323
1324 static const struct rpc_call_ops nfs4_close_ops = {
1325         .rpc_call_prepare = nfs4_close_prepare,
1326         .rpc_call_done = nfs4_close_done,
1327         .rpc_release = nfs4_free_closedata,
1328 };
1329
1330 /*
1331  * It is possible for data to be read/written from a mem-mapped file
1332  * after the sys_close call (which hits the vfs layer as a flush).
1333  * This means that we can't safely call nfsv4 close on a file until
1334  * the inode is cleared. This in turn means that we are not good
1335  * NFSv4 citizens - we do not indicate to the server to update the file's
1336  * share state even when we are done with one of the three share
1337  * stateid's in the inode.
1338  *
1339  * NOTE: Caller must be holding the sp->so_owner semaphore!
1340  */
1341 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1342 {
1343         struct nfs_server *server = NFS_SERVER(state->inode);
1344         struct nfs4_closedata *calldata;
1345         struct nfs4_state_owner *sp = state->owner;
1346         struct rpc_task *task;
1347         int status = -ENOMEM;
1348
1349         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1350         if (calldata == NULL)
1351                 goto out;
1352         calldata->inode = state->inode;
1353         calldata->state = state;
1354         calldata->arg.fh = NFS_FH(state->inode);
1355         calldata->arg.stateid = &state->open_stateid;
1356         /* Serialization for the sequence id */
1357         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1358         if (calldata->arg.seqid == NULL)
1359                 goto out_free_calldata;
1360         calldata->arg.bitmask = server->attr_bitmask;
1361         calldata->res.fattr = &calldata->fattr;
1362         calldata->res.server = server;
1363         calldata->path.mnt = mntget(path->mnt);
1364         calldata->path.dentry = dget(path->dentry);
1365
1366         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1367         if (IS_ERR(task))
1368                 return PTR_ERR(task);
1369         rpc_put_task(task);
1370         return 0;
1371 out_free_calldata:
1372         kfree(calldata);
1373 out:
1374         nfs4_put_open_state(state);
1375         nfs4_put_state_owner(sp);
1376         return status;
1377 }
1378
1379 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1380 {
1381         struct file *filp;
1382         int ret;
1383
1384         /* If the open_intent is for execute, we have an extra check to make */
1385         if (nd->intent.open.flags & FMODE_EXEC) {
1386                 ret = _nfs4_do_access(state->inode,
1387                                 state->owner->so_cred,
1388                                 nd->intent.open.flags);
1389                 if (ret < 0)
1390                         goto out_close;
1391         }
1392         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1393         if (!IS_ERR(filp)) {
1394                 struct nfs_open_context *ctx;
1395                 ctx = (struct nfs_open_context *)filp->private_data;
1396                 ctx->state = state;
1397                 return 0;
1398         }
1399         ret = PTR_ERR(filp);
1400 out_close:
1401         nfs4_close_state(path, state, nd->intent.open.flags);
1402         return ret;
1403 }
1404
1405 struct dentry *
1406 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1407 {
1408         struct path path = {
1409                 .mnt = nd->mnt,
1410                 .dentry = dentry,
1411         };
1412         struct iattr attr;
1413         struct rpc_cred *cred;
1414         struct nfs4_state *state;
1415         struct dentry *res;
1416
1417         if (nd->flags & LOOKUP_CREATE) {
1418                 attr.ia_mode = nd->intent.open.create_mode;
1419                 attr.ia_valid = ATTR_MODE;
1420                 if (!IS_POSIXACL(dir))
1421                         attr.ia_mode &= ~current->fs->umask;
1422         } else {
1423                 attr.ia_valid = 0;
1424                 BUG_ON(nd->intent.open.flags & O_CREAT);
1425         }
1426
1427         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1428         if (IS_ERR(cred))
1429                 return (struct dentry *)cred;
1430         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1431         put_rpccred(cred);
1432         if (IS_ERR(state)) {
1433                 if (PTR_ERR(state) == -ENOENT)
1434                         d_add(dentry, NULL);
1435                 return (struct dentry *)state;
1436         }
1437         res = d_add_unique(dentry, igrab(state->inode));
1438         if (res != NULL)
1439                 dentry = res;
1440         nfs4_intent_set_file(nd, &path, state);
1441         return res;
1442 }
1443
1444 int
1445 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1446 {
1447         struct path path = {
1448                 .mnt = nd->mnt,
1449                 .dentry = dentry,
1450         };
1451         struct rpc_cred *cred;
1452         struct nfs4_state *state;
1453
1454         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1455         if (IS_ERR(cred))
1456                 return PTR_ERR(cred);
1457         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1458         put_rpccred(cred);
1459         if (IS_ERR(state)) {
1460                 switch (PTR_ERR(state)) {
1461                         case -EPERM:
1462                         case -EACCES:
1463                         case -EDQUOT:
1464                         case -ENOSPC:
1465                         case -EROFS:
1466                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1467                                 return 1;
1468                         default:
1469                                 goto out_drop;
1470                 }
1471         }
1472         if (state->inode == dentry->d_inode) {
1473                 nfs4_intent_set_file(nd, &path, state);
1474                 return 1;
1475         }
1476         nfs4_close_state(&path, state, openflags);
1477 out_drop:
1478         d_drop(dentry);
1479         return 0;
1480 }
1481
1482
1483 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1484 {
1485         struct nfs4_server_caps_res res = {};
1486         struct rpc_message msg = {
1487                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1488                 .rpc_argp = fhandle,
1489                 .rpc_resp = &res,
1490         };
1491         int status;
1492
1493         status = rpc_call_sync(server->client, &msg, 0);
1494         if (status == 0) {
1495                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1496                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1497                         server->caps |= NFS_CAP_ACLS;
1498                 if (res.has_links != 0)
1499                         server->caps |= NFS_CAP_HARDLINKS;
1500                 if (res.has_symlinks != 0)
1501                         server->caps |= NFS_CAP_SYMLINKS;
1502                 server->acl_bitmask = res.acl_bitmask;
1503         }
1504         return status;
1505 }
1506
1507 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1508 {
1509         struct nfs4_exception exception = { };
1510         int err;
1511         do {
1512                 err = nfs4_handle_exception(server,
1513                                 _nfs4_server_capabilities(server, fhandle),
1514                                 &exception);
1515         } while (exception.retry);
1516         return err;
1517 }
1518
1519 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1520                 struct nfs_fsinfo *info)
1521 {
1522         struct nfs4_lookup_root_arg args = {
1523                 .bitmask = nfs4_fattr_bitmap,
1524         };
1525         struct nfs4_lookup_res res = {
1526                 .server = server,
1527                 .fattr = info->fattr,
1528                 .fh = fhandle,
1529         };
1530         struct rpc_message msg = {
1531                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1532                 .rpc_argp = &args,
1533                 .rpc_resp = &res,
1534         };
1535         nfs_fattr_init(info->fattr);
1536         return rpc_call_sync(server->client, &msg, 0);
1537 }
1538
1539 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1540                 struct nfs_fsinfo *info)
1541 {
1542         struct nfs4_exception exception = { };
1543         int err;
1544         do {
1545                 err = nfs4_handle_exception(server,
1546                                 _nfs4_lookup_root(server, fhandle, info),
1547                                 &exception);
1548         } while (exception.retry);
1549         return err;
1550 }
1551
1552 /*
1553  * get the file handle for the "/" directory on the server
1554  */
1555 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1556                               struct nfs_fsinfo *info)
1557 {
1558         int status;
1559
1560         status = nfs4_lookup_root(server, fhandle, info);
1561         if (status == 0)
1562                 status = nfs4_server_capabilities(server, fhandle);
1563         if (status == 0)
1564                 status = nfs4_do_fsinfo(server, fhandle, info);
1565         return nfs4_map_errors(status);
1566 }
1567
1568 /*
1569  * Get locations and (maybe) other attributes of a referral.
1570  * Note that we'll actually follow the referral later when
1571  * we detect fsid mismatch in inode revalidation
1572  */
1573 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1574 {
1575         int status = -ENOMEM;
1576         struct page *page = NULL;
1577         struct nfs4_fs_locations *locations = NULL;
1578
1579         page = alloc_page(GFP_KERNEL);
1580         if (page == NULL)
1581                 goto out;
1582         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1583         if (locations == NULL)
1584                 goto out;
1585
1586         status = nfs4_proc_fs_locations(dir, name, locations, page);
1587         if (status != 0)
1588                 goto out;
1589         /* Make sure server returned a different fsid for the referral */
1590         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1591                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1592                 status = -EIO;
1593                 goto out;
1594         }
1595
1596         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1597         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1598         if (!fattr->mode)
1599                 fattr->mode = S_IFDIR;
1600         memset(fhandle, 0, sizeof(struct nfs_fh));
1601 out:
1602         if (page)
1603                 __free_page(page);
1604         if (locations)
1605                 kfree(locations);
1606         return status;
1607 }
1608
1609 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1610 {
1611         struct nfs4_getattr_arg args = {
1612                 .fh = fhandle,
1613                 .bitmask = server->attr_bitmask,
1614         };
1615         struct nfs4_getattr_res res = {
1616                 .fattr = fattr,
1617                 .server = server,
1618         };
1619         struct rpc_message msg = {
1620                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1621                 .rpc_argp = &args,
1622                 .rpc_resp = &res,
1623         };
1624
1625         nfs_fattr_init(fattr);
1626         return rpc_call_sync(server->client, &msg, 0);
1627 }
1628
1629 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1630 {
1631         struct nfs4_exception exception = { };
1632         int err;
1633         do {
1634                 err = nfs4_handle_exception(server,
1635                                 _nfs4_proc_getattr(server, fhandle, fattr),
1636                                 &exception);
1637         } while (exception.retry);
1638         return err;
1639 }
1640
1641 /*
1642  * The file is not closed if it is opened due to the a request to change
1643  * the size of the file. The open call will not be needed once the
1644  * VFS layer lookup-intents are implemented.
1645  *
1646  * Close is called when the inode is destroyed.
1647  * If we haven't opened the file for O_WRONLY, we
1648  * need to in the size_change case to obtain a stateid.
1649  *
1650  * Got race?
1651  * Because OPEN is always done by name in nfsv4, it is
1652  * possible that we opened a different file by the same
1653  * name.  We can recognize this race condition, but we
1654  * can't do anything about it besides returning an error.
1655  *
1656  * This will be fixed with VFS changes (lookup-intent).
1657  */
1658 static int
1659 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1660                   struct iattr *sattr)
1661 {
1662         struct rpc_cred *cred;
1663         struct inode *inode = dentry->d_inode;
1664         struct nfs_open_context *ctx;
1665         struct nfs4_state *state = NULL;
1666         int status;
1667
1668         nfs_fattr_init(fattr);
1669
1670         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1671         if (IS_ERR(cred))
1672                 return PTR_ERR(cred);
1673
1674         /* Search for an existing open(O_WRITE) file */
1675         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1676         if (ctx != NULL)
1677                 state = ctx->state;
1678
1679         status = nfs4_do_setattr(inode, fattr, sattr, state);
1680         if (status == 0)
1681                 nfs_setattr_update_inode(inode, sattr);
1682         if (ctx != NULL)
1683                 put_nfs_open_context(ctx);
1684         put_rpccred(cred);
1685         return status;
1686 }
1687
1688 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1689                 const struct qstr *name, struct nfs_fh *fhandle,
1690                 struct nfs_fattr *fattr)
1691 {
1692         int                    status;
1693         struct nfs4_lookup_arg args = {
1694                 .bitmask = server->attr_bitmask,
1695                 .dir_fh = dirfh,
1696                 .name = name,
1697         };
1698         struct nfs4_lookup_res res = {
1699                 .server = server,
1700                 .fattr = fattr,
1701                 .fh = fhandle,
1702         };
1703         struct rpc_message msg = {
1704                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1705                 .rpc_argp = &args,
1706                 .rpc_resp = &res,
1707         };
1708
1709         nfs_fattr_init(fattr);
1710
1711         dprintk("NFS call  lookupfh %s\n", name->name);
1712         status = rpc_call_sync(server->client, &msg, 0);
1713         dprintk("NFS reply lookupfh: %d\n", status);
1714         return status;
1715 }
1716
1717 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1718                               struct qstr *name, struct nfs_fh *fhandle,
1719                               struct nfs_fattr *fattr)
1720 {
1721         struct nfs4_exception exception = { };
1722         int err;
1723         do {
1724                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1725                 /* FIXME: !!!! */
1726                 if (err == -NFS4ERR_MOVED) {
1727                         err = -EREMOTE;
1728                         break;
1729                 }
1730                 err = nfs4_handle_exception(server, err, &exception);
1731         } while (exception.retry);
1732         return err;
1733 }
1734
1735 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1736                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1737 {
1738         int status;
1739
1740         dprintk("NFS call  lookup %s\n", name->name);
1741         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1742         if (status == -NFS4ERR_MOVED)
1743                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1744         dprintk("NFS reply lookup: %d\n", status);
1745         return status;
1746 }
1747
1748 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1749 {
1750         struct nfs4_exception exception = { };
1751         int err;
1752         do {
1753                 err = nfs4_handle_exception(NFS_SERVER(dir),
1754                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1755                                 &exception);
1756         } while (exception.retry);
1757         return err;
1758 }
1759
1760 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1761 {
1762         struct nfs4_accessargs args = {
1763                 .fh = NFS_FH(inode),
1764         };
1765         struct nfs4_accessres res = { 0 };
1766         struct rpc_message msg = {
1767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1768                 .rpc_argp = &args,
1769                 .rpc_resp = &res,
1770                 .rpc_cred = entry->cred,
1771         };
1772         int mode = entry->mask;
1773         int status;
1774
1775         /*
1776          * Determine which access bits we want to ask for...
1777          */
1778         if (mode & MAY_READ)
1779                 args.access |= NFS4_ACCESS_READ;
1780         if (S_ISDIR(inode->i_mode)) {
1781                 if (mode & MAY_WRITE)
1782                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1783                 if (mode & MAY_EXEC)
1784                         args.access |= NFS4_ACCESS_LOOKUP;
1785         } else {
1786                 if (mode & MAY_WRITE)
1787                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1788                 if (mode & MAY_EXEC)
1789                         args.access |= NFS4_ACCESS_EXECUTE;
1790         }
1791         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1792         if (!status) {
1793                 entry->mask = 0;
1794                 if (res.access & NFS4_ACCESS_READ)
1795                         entry->mask |= MAY_READ;
1796                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1797                         entry->mask |= MAY_WRITE;
1798                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1799                         entry->mask |= MAY_EXEC;
1800         }
1801         return status;
1802 }
1803
1804 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1805 {
1806         struct nfs4_exception exception = { };
1807         int err;
1808         do {
1809                 err = nfs4_handle_exception(NFS_SERVER(inode),
1810                                 _nfs4_proc_access(inode, entry),
1811                                 &exception);
1812         } while (exception.retry);
1813         return err;
1814 }
1815
1816 /*
1817  * TODO: For the time being, we don't try to get any attributes
1818  * along with any of the zero-copy operations READ, READDIR,
1819  * READLINK, WRITE.
1820  *
1821  * In the case of the first three, we want to put the GETATTR
1822  * after the read-type operation -- this is because it is hard
1823  * to predict the length of a GETATTR response in v4, and thus
1824  * align the READ data correctly.  This means that the GETATTR
1825  * may end up partially falling into the page cache, and we should
1826  * shift it into the 'tail' of the xdr_buf before processing.
1827  * To do this efficiently, we need to know the total length
1828  * of data received, which doesn't seem to be available outside
1829  * of the RPC layer.
1830  *
1831  * In the case of WRITE, we also want to put the GETATTR after
1832  * the operation -- in this case because we want to make sure
1833  * we get the post-operation mtime and size.  This means that
1834  * we can't use xdr_encode_pages() as written: we need a variant
1835  * of it which would leave room in the 'tail' iovec.
1836  *
1837  * Both of these changes to the XDR layer would in fact be quite
1838  * minor, but I decided to leave them for a subsequent patch.
1839  */
1840 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1841                 unsigned int pgbase, unsigned int pglen)
1842 {
1843         struct nfs4_readlink args = {
1844                 .fh       = NFS_FH(inode),
1845                 .pgbase   = pgbase,
1846                 .pglen    = pglen,
1847                 .pages    = &page,
1848         };
1849         struct rpc_message msg = {
1850                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1851                 .rpc_argp = &args,
1852                 .rpc_resp = NULL,
1853         };
1854
1855         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1856 }
1857
1858 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1859                 unsigned int pgbase, unsigned int pglen)
1860 {
1861         struct nfs4_exception exception = { };
1862         int err;
1863         do {
1864                 err = nfs4_handle_exception(NFS_SERVER(inode),
1865                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1866                                 &exception);
1867         } while (exception.retry);
1868         return err;
1869 }
1870
1871 /*
1872  * Got race?
1873  * We will need to arrange for the VFS layer to provide an atomic open.
1874  * Until then, this create/open method is prone to inefficiency and race
1875  * conditions due to the lookup, create, and open VFS calls from sys_open()
1876  * placed on the wire.
1877  *
1878  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1879  * The file will be opened again in the subsequent VFS open call
1880  * (nfs4_proc_file_open).
1881  *
1882  * The open for read will just hang around to be used by any process that
1883  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1884  */
1885
1886 static int
1887 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1888                  int flags, struct nameidata *nd)
1889 {
1890         struct path path = {
1891                 .mnt = nd->mnt,
1892                 .dentry = dentry,
1893         };
1894         struct nfs4_state *state;
1895         struct rpc_cred *cred;
1896         int status = 0;
1897
1898         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1899         if (IS_ERR(cred)) {
1900                 status = PTR_ERR(cred);
1901                 goto out;
1902         }
1903         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1904         put_rpccred(cred);
1905         if (IS_ERR(state)) {
1906                 status = PTR_ERR(state);
1907                 goto out;
1908         }
1909         d_instantiate(dentry, igrab(state->inode));
1910         if (flags & O_EXCL) {
1911                 struct nfs_fattr fattr;
1912                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1913                 if (status == 0)
1914                         nfs_setattr_update_inode(state->inode, sattr);
1915                 nfs_post_op_update_inode(state->inode, &fattr);
1916         }
1917         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1918                 status = nfs4_intent_set_file(nd, &path, state);
1919         else
1920                 nfs4_close_state(&path, state, flags);
1921 out:
1922         return status;
1923 }
1924
1925 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1926 {
1927         struct nfs_server *server = NFS_SERVER(dir);
1928         struct nfs_removeargs args = {
1929                 .fh = NFS_FH(dir),
1930                 .name.len = name->len,
1931                 .name.name = name->name,
1932                 .bitmask = server->attr_bitmask,
1933         };
1934         struct nfs_removeres res = {
1935                 .server = server,
1936         };
1937         struct rpc_message msg = {
1938                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1939                 .rpc_argp = &args,
1940                 .rpc_resp = &res,
1941         };
1942         int                     status;
1943
1944         nfs_fattr_init(&res.dir_attr);
1945         status = rpc_call_sync(server->client, &msg, 0);
1946         if (status == 0) {
1947                 update_changeattr(dir, &res.cinfo);
1948                 nfs_post_op_update_inode(dir, &res.dir_attr);
1949         }
1950         return status;
1951 }
1952
1953 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1954 {
1955         struct nfs4_exception exception = { };
1956         int err;
1957         do {
1958                 err = nfs4_handle_exception(NFS_SERVER(dir),
1959                                 _nfs4_proc_remove(dir, name),
1960                                 &exception);
1961         } while (exception.retry);
1962         return err;
1963 }
1964
1965 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1966 {
1967         struct nfs_server *server = NFS_SERVER(dir);
1968         struct nfs_removeargs *args = msg->rpc_argp;
1969         struct nfs_removeres *res = msg->rpc_resp;
1970
1971         args->bitmask = server->attr_bitmask;
1972         res->server = server;
1973         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1974 }
1975
1976 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1977 {
1978         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1979
1980         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1981                 return 0;
1982         update_changeattr(dir, &res->cinfo);
1983         nfs_post_op_update_inode(dir, &res->dir_attr);
1984         return 1;
1985 }
1986
1987 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1988                 struct inode *new_dir, struct qstr *new_name)
1989 {
1990         struct nfs_server *server = NFS_SERVER(old_dir);
1991         struct nfs4_rename_arg arg = {
1992                 .old_dir = NFS_FH(old_dir),
1993                 .new_dir = NFS_FH(new_dir),
1994                 .old_name = old_name,
1995                 .new_name = new_name,
1996                 .bitmask = server->attr_bitmask,
1997         };
1998         struct nfs_fattr old_fattr, new_fattr;
1999         struct nfs4_rename_res res = {
2000                 .server = server,
2001                 .old_fattr = &old_fattr,
2002                 .new_fattr = &new_fattr,
2003         };
2004         struct rpc_message msg = {
2005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2006                 .rpc_argp = &arg,
2007                 .rpc_resp = &res,
2008         };
2009         int                     status;
2010
2011         nfs_fattr_init(res.old_fattr);
2012         nfs_fattr_init(res.new_fattr);
2013         status = rpc_call_sync(server->client, &msg, 0);
2014
2015         if (!status) {
2016                 update_changeattr(old_dir, &res.old_cinfo);
2017                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2018                 update_changeattr(new_dir, &res.new_cinfo);
2019                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2020         }
2021         return status;
2022 }
2023
2024 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2025                 struct inode *new_dir, struct qstr *new_name)
2026 {
2027         struct nfs4_exception exception = { };
2028         int err;
2029         do {
2030                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2031                                 _nfs4_proc_rename(old_dir, old_name,
2032                                         new_dir, new_name),
2033                                 &exception);
2034         } while (exception.retry);
2035         return err;
2036 }
2037
2038 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2039 {
2040         struct nfs_server *server = NFS_SERVER(inode);
2041         struct nfs4_link_arg arg = {
2042                 .fh     = NFS_FH(inode),
2043                 .dir_fh = NFS_FH(dir),
2044                 .name   = name,
2045                 .bitmask = server->attr_bitmask,
2046         };
2047         struct nfs_fattr fattr, dir_attr;
2048         struct nfs4_link_res res = {
2049                 .server = server,
2050                 .fattr = &fattr,
2051                 .dir_attr = &dir_attr,
2052         };
2053         struct rpc_message msg = {
2054                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2055                 .rpc_argp = &arg,
2056                 .rpc_resp = &res,
2057         };
2058         int                     status;
2059
2060         nfs_fattr_init(res.fattr);
2061         nfs_fattr_init(res.dir_attr);
2062         status = rpc_call_sync(server->client, &msg, 0);
2063         if (!status) {
2064                 update_changeattr(dir, &res.cinfo);
2065                 nfs_post_op_update_inode(dir, res.dir_attr);
2066                 nfs_post_op_update_inode(inode, res.fattr);
2067         }
2068
2069         return status;
2070 }
2071
2072 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2073 {
2074         struct nfs4_exception exception = { };
2075         int err;
2076         do {
2077                 err = nfs4_handle_exception(NFS_SERVER(inode),
2078                                 _nfs4_proc_link(inode, dir, name),
2079                                 &exception);
2080         } while (exception.retry);
2081         return err;
2082 }
2083
2084 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2085                 struct page *page, unsigned int len, struct iattr *sattr)
2086 {
2087         struct nfs_server *server = NFS_SERVER(dir);
2088         struct nfs_fh fhandle;
2089         struct nfs_fattr fattr, dir_fattr;
2090         struct nfs4_create_arg arg = {
2091                 .dir_fh = NFS_FH(dir),
2092                 .server = server,
2093                 .name = &dentry->d_name,
2094                 .attrs = sattr,
2095                 .ftype = NF4LNK,
2096                 .bitmask = server->attr_bitmask,
2097         };
2098         struct nfs4_create_res res = {
2099                 .server = server,
2100                 .fh = &fhandle,
2101                 .fattr = &fattr,
2102                 .dir_fattr = &dir_fattr,
2103         };
2104         struct rpc_message msg = {
2105                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2106                 .rpc_argp = &arg,
2107                 .rpc_resp = &res,
2108         };
2109         int                     status;
2110
2111         if (len > NFS4_MAXPATHLEN)
2112                 return -ENAMETOOLONG;
2113
2114         arg.u.symlink.pages = &page;
2115         arg.u.symlink.len = len;
2116         nfs_fattr_init(&fattr);
2117         nfs_fattr_init(&dir_fattr);
2118
2119         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2120         if (!status) {
2121                 update_changeattr(dir, &res.dir_cinfo);
2122                 nfs_post_op_update_inode(dir, res.dir_fattr);
2123                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2124         }
2125         return status;
2126 }
2127
2128 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2129                 struct page *page, unsigned int len, struct iattr *sattr)
2130 {
2131         struct nfs4_exception exception = { };
2132         int err;
2133         do {
2134                 err = nfs4_handle_exception(NFS_SERVER(dir),
2135                                 _nfs4_proc_symlink(dir, dentry, page,
2136                                                         len, sattr),
2137                                 &exception);
2138         } while (exception.retry);
2139         return err;
2140 }
2141
2142 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2143                 struct iattr *sattr)
2144 {
2145         struct nfs_server *server = NFS_SERVER(dir);
2146         struct nfs_fh fhandle;
2147         struct nfs_fattr fattr, dir_fattr;
2148         struct nfs4_create_arg arg = {
2149                 .dir_fh = NFS_FH(dir),
2150                 .server = server,
2151                 .name = &dentry->d_name,
2152                 .attrs = sattr,
2153                 .ftype = NF4DIR,
2154                 .bitmask = server->attr_bitmask,
2155         };
2156         struct nfs4_create_res res = {
2157                 .server = server,
2158                 .fh = &fhandle,
2159                 .fattr = &fattr,
2160                 .dir_fattr = &dir_fattr,
2161         };
2162         struct rpc_message msg = {
2163                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2164                 .rpc_argp = &arg,
2165                 .rpc_resp = &res,
2166         };
2167         int                     status;
2168
2169         nfs_fattr_init(&fattr);
2170         nfs_fattr_init(&dir_fattr);
2171
2172         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2173         if (!status) {
2174                 update_changeattr(dir, &res.dir_cinfo);
2175                 nfs_post_op_update_inode(dir, res.dir_fattr);
2176                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2177         }
2178         return status;
2179 }
2180
2181 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2182                 struct iattr *sattr)
2183 {
2184         struct nfs4_exception exception = { };
2185         int err;
2186         do {
2187                 err = nfs4_handle_exception(NFS_SERVER(dir),
2188                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2189                                 &exception);
2190         } while (exception.retry);
2191         return err;
2192 }
2193
2194 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2195                   u64 cookie, struct page *page, unsigned int count, int plus)
2196 {
2197         struct inode            *dir = dentry->d_inode;
2198         struct nfs4_readdir_arg args = {
2199                 .fh = NFS_FH(dir),
2200                 .pages = &page,
2201                 .pgbase = 0,
2202                 .count = count,
2203                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2204         };
2205         struct nfs4_readdir_res res;
2206         struct rpc_message msg = {
2207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2208                 .rpc_argp = &args,
2209                 .rpc_resp = &res,
2210                 .rpc_cred = cred,
2211         };
2212         int                     status;
2213
2214         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2215                         dentry->d_parent->d_name.name,
2216                         dentry->d_name.name,
2217                         (unsigned long long)cookie);
2218         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2219         res.pgbase = args.pgbase;
2220         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2221         if (status == 0)
2222                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2223         dprintk("%s: returns %d\n", __FUNCTION__, status);
2224         return status;
2225 }
2226
2227 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2228                   u64 cookie, struct page *page, unsigned int count, int plus)
2229 {
2230         struct nfs4_exception exception = { };
2231         int err;
2232         do {
2233                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2234                                 _nfs4_proc_readdir(dentry, cred, cookie,
2235                                         page, count, plus),
2236                                 &exception);
2237         } while (exception.retry);
2238         return err;
2239 }
2240
2241 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2242                 struct iattr *sattr, dev_t rdev)
2243 {
2244         struct nfs_server *server = NFS_SERVER(dir);
2245         struct nfs_fh fh;
2246         struct nfs_fattr fattr, dir_fattr;
2247         struct nfs4_create_arg arg = {
2248                 .dir_fh = NFS_FH(dir),
2249                 .server = server,
2250                 .name = &dentry->d_name,
2251                 .attrs = sattr,
2252                 .bitmask = server->attr_bitmask,
2253         };
2254         struct nfs4_create_res res = {
2255                 .server = server,
2256                 .fh = &fh,
2257                 .fattr = &fattr,
2258                 .dir_fattr = &dir_fattr,
2259         };
2260         struct rpc_message msg = {
2261                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2262                 .rpc_argp = &arg,
2263                 .rpc_resp = &res,
2264         };
2265         int                     status;
2266         int                     mode = sattr->ia_mode;
2267
2268         nfs_fattr_init(&fattr);
2269         nfs_fattr_init(&dir_fattr);
2270
2271         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2272         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2273         if (S_ISFIFO(mode))
2274                 arg.ftype = NF4FIFO;
2275         else if (S_ISBLK(mode)) {
2276                 arg.ftype = NF4BLK;
2277                 arg.u.device.specdata1 = MAJOR(rdev);
2278                 arg.u.device.specdata2 = MINOR(rdev);
2279         }
2280         else if (S_ISCHR(mode)) {
2281                 arg.ftype = NF4CHR;
2282                 arg.u.device.specdata1 = MAJOR(rdev);
2283                 arg.u.device.specdata2 = MINOR(rdev);
2284         }
2285         else
2286                 arg.ftype = NF4SOCK;
2287
2288         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2289         if (status == 0) {
2290                 update_changeattr(dir, &res.dir_cinfo);
2291                 nfs_post_op_update_inode(dir, res.dir_fattr);
2292                 status = nfs_instantiate(dentry, &fh, &fattr);
2293         }
2294         return status;
2295 }
2296
2297 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2298                 struct iattr *sattr, dev_t rdev)
2299 {
2300         struct nfs4_exception exception = { };
2301         int err;
2302         do {
2303                 err = nfs4_handle_exception(NFS_SERVER(dir),
2304                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2305                                 &exception);
2306         } while (exception.retry);
2307         return err;
2308 }
2309
2310 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2311                  struct nfs_fsstat *fsstat)
2312 {
2313         struct nfs4_statfs_arg args = {
2314                 .fh = fhandle,
2315                 .bitmask = server->attr_bitmask,
2316         };
2317         struct rpc_message msg = {
2318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2319                 .rpc_argp = &args,
2320                 .rpc_resp = fsstat,
2321         };
2322
2323         nfs_fattr_init(fsstat->fattr);
2324         return rpc_call_sync(server->client, &msg, 0);
2325 }
2326
2327 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2328 {
2329         struct nfs4_exception exception = { };
2330         int err;
2331         do {
2332                 err = nfs4_handle_exception(server,
2333                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2334                                 &exception);
2335         } while (exception.retry);
2336         return err;
2337 }
2338
2339 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2340                 struct nfs_fsinfo *fsinfo)
2341 {
2342         struct nfs4_fsinfo_arg args = {
2343                 .fh = fhandle,
2344                 .bitmask = server->attr_bitmask,
2345         };
2346         struct rpc_message msg = {
2347                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2348                 .rpc_argp = &args,
2349                 .rpc_resp = fsinfo,
2350         };
2351
2352         return rpc_call_sync(server->client, &msg, 0);
2353 }
2354
2355 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2356 {
2357         struct nfs4_exception exception = { };
2358         int err;
2359
2360         do {
2361                 err = nfs4_handle_exception(server,
2362                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2363                                 &exception);
2364         } while (exception.retry);
2365         return err;
2366 }
2367
2368 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2369 {
2370         nfs_fattr_init(fsinfo->fattr);
2371         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2372 }
2373
2374 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2375                 struct nfs_pathconf *pathconf)
2376 {
2377         struct nfs4_pathconf_arg args = {
2378                 .fh = fhandle,
2379                 .bitmask = server->attr_bitmask,
2380         };
2381         struct rpc_message msg = {
2382                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2383                 .rpc_argp = &args,
2384                 .rpc_resp = pathconf,
2385         };
2386
2387         /* None of the pathconf attributes are mandatory to implement */
2388         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2389                 memset(pathconf, 0, sizeof(*pathconf));
2390                 return 0;
2391         }
2392
2393         nfs_fattr_init(pathconf->fattr);
2394         return rpc_call_sync(server->client, &msg, 0);
2395 }
2396
2397 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2398                 struct nfs_pathconf *pathconf)
2399 {
2400         struct nfs4_exception exception = { };
2401         int err;
2402
2403         do {
2404                 err = nfs4_handle_exception(server,
2405                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2406                                 &exception);
2407         } while (exception.retry);
2408         return err;
2409 }
2410
2411 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2412 {
2413         struct nfs_server *server = NFS_SERVER(data->inode);
2414
2415         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2416                 rpc_restart_call(task);
2417                 return -EAGAIN;
2418         }
2419         if (task->tk_status > 0)
2420                 renew_lease(server, data->timestamp);
2421         return 0;
2422 }
2423
2424 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2425 {
2426         struct rpc_message msg = {
2427                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2428                 .rpc_argp = &data->args,
2429                 .rpc_resp = &data->res,
2430                 .rpc_cred = data->cred,
2431         };
2432
2433         data->timestamp   = jiffies;
2434
2435         rpc_call_setup(&data->task, &msg, 0);
2436 }
2437
2438 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2439 {
2440         struct inode *inode = data->inode;
2441
2442         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2443                 rpc_restart_call(task);
2444                 return -EAGAIN;
2445         }
2446         if (task->tk_status >= 0) {
2447                 renew_lease(NFS_SERVER(inode), data->timestamp);
2448                 nfs_post_op_update_inode(inode, data->res.fattr);
2449         }
2450         return 0;
2451 }
2452
2453 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2454 {
2455         struct rpc_message msg = {
2456                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2457                 .rpc_argp = &data->args,
2458                 .rpc_resp = &data->res,
2459                 .rpc_cred = data->cred,
2460         };
2461         struct inode *inode = data->inode;
2462         struct nfs_server *server = NFS_SERVER(inode);
2463         int stable;
2464
2465         if (how & FLUSH_STABLE) {
2466                 if (!NFS_I(inode)->ncommit)
2467                         stable = NFS_FILE_SYNC;
2468                 else
2469                         stable = NFS_DATA_SYNC;
2470         } else
2471                 stable = NFS_UNSTABLE;
2472         data->args.stable = stable;
2473         data->args.bitmask = server->attr_bitmask;
2474         data->res.server = server;
2475
2476         data->timestamp   = jiffies;
2477
2478         /* Finalize the task. */
2479         rpc_call_setup(&data->task, &msg, 0);
2480 }
2481
2482 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2483 {
2484         struct inode *inode = data->inode;
2485
2486         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2487                 rpc_restart_call(task);
2488                 return -EAGAIN;
2489         }
2490         if (task->tk_status >= 0)
2491                 nfs_post_op_update_inode(inode, data->res.fattr);
2492         return 0;
2493 }
2494
2495 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2496 {
2497         struct rpc_message msg = {
2498                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2499                 .rpc_argp = &data->args,
2500                 .rpc_resp = &data->res,
2501                 .rpc_cred = data->cred,
2502         };
2503         struct nfs_server *server = NFS_SERVER(data->inode);
2504
2505         data->args.bitmask = server->attr_bitmask;
2506         data->res.server = server;
2507
2508         rpc_call_setup(&data->task, &msg, 0);
2509 }
2510
2511 /*
2512  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2513  * standalone procedure for queueing an asynchronous RENEW.
2514  */
2515 static void nfs4_renew_done(struct rpc_task *task, void *data)
2516 {
2517         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2518         unsigned long timestamp = (unsigned long)data;
2519
2520         if (task->tk_status < 0) {
2521                 switch (task->tk_status) {
2522                         case -NFS4ERR_STALE_CLIENTID:
2523                         case -NFS4ERR_EXPIRED:
2524                         case -NFS4ERR_CB_PATH_DOWN:
2525                                 nfs4_schedule_state_recovery(clp);
2526                 }
2527                 return;
2528         }
2529         spin_lock(&clp->cl_lock);
2530         if (time_before(clp->cl_last_renewal,timestamp))
2531                 clp->cl_last_renewal = timestamp;
2532         spin_unlock(&clp->cl_lock);
2533 }
2534
2535 static const struct rpc_call_ops nfs4_renew_ops = {
2536         .rpc_call_done = nfs4_renew_done,
2537 };
2538
2539 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2540 {
2541         struct rpc_message msg = {
2542                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2543                 .rpc_argp       = clp,
2544                 .rpc_cred       = cred,
2545         };
2546
2547         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2548                         &nfs4_renew_ops, (void *)jiffies);
2549 }
2550
2551 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2552 {
2553         struct rpc_message msg = {
2554                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2555                 .rpc_argp       = clp,
2556                 .rpc_cred       = cred,
2557         };
2558         unsigned long now = jiffies;
2559         int status;
2560
2561         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2562         if (status < 0)
2563                 return status;
2564         spin_lock(&clp->cl_lock);
2565         if (time_before(clp->cl_last_renewal,now))
2566                 clp->cl_last_renewal = now;
2567         spin_unlock(&clp->cl_lock);
2568         return 0;
2569 }
2570
2571 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2572 {
2573         return (server->caps & NFS_CAP_ACLS)
2574                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2575                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2576 }
2577
2578 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2579  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2580  * the stack.
2581  */
2582 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2583
2584 static void buf_to_pages(const void *buf, size_t buflen,
2585                 struct page **pages, unsigned int *pgbase)
2586 {
2587         const void *p = buf;
2588
2589         *pgbase = offset_in_page(buf);
2590         p -= *pgbase;
2591         while (p < buf + buflen) {
2592                 *(pages++) = virt_to_page(p);
2593                 p += PAGE_CACHE_SIZE;
2594         }
2595 }
2596
2597 struct nfs4_cached_acl {
2598         int cached;
2599         size_t len;
2600         char data[0];
2601 };
2602
2603 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2604 {
2605         struct nfs_inode *nfsi = NFS_I(inode);
2606
2607         spin_lock(&inode->i_lock);
2608         kfree(nfsi->nfs4_acl);
2609         nfsi->nfs4_acl = acl;
2610         spin_unlock(&inode->i_lock);
2611 }
2612
2613 static void nfs4_zap_acl_attr(struct inode *inode)
2614 {
2615         nfs4_set_cached_acl(inode, NULL);
2616 }
2617
2618 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2619 {
2620         struct nfs_inode *nfsi = NFS_I(inode);
2621         struct nfs4_cached_acl *acl;
2622         int ret = -ENOENT;
2623
2624         spin_lock(&inode->i_lock);
2625         acl = nfsi->nfs4_acl;
2626         if (acl == NULL)
2627                 goto out;
2628         if (buf == NULL) /* user is just asking for length */
2629                 goto out_len;
2630         if (acl->cached == 0)
2631                 goto out;
2632         ret = -ERANGE; /* see getxattr(2) man page */
2633         if (acl->len > buflen)
2634                 goto out;
2635         memcpy(buf, acl->data, acl->len);
2636 out_len:
2637         ret = acl->len;
2638 out:
2639         spin_unlock(&inode->i_lock);
2640         return ret;
2641 }
2642
2643 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2644 {
2645         struct nfs4_cached_acl *acl;
2646
2647         if (buf && acl_len <= PAGE_SIZE) {
2648                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2649                 if (acl == NULL)
2650                         goto out;
2651                 acl->cached = 1;
2652                 memcpy(acl->data, buf, acl_len);
2653         } else {
2654                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2655                 if (acl == NULL)
2656                         goto out;
2657                 acl->cached = 0;
2658         }
2659         acl->len = acl_len;
2660 out:
2661         nfs4_set_cached_acl(inode, acl);
2662 }
2663
2664 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2665 {
2666         struct page *pages[NFS4ACL_MAXPAGES];
2667         struct nfs_getaclargs args = {
2668                 .fh = NFS_FH(inode),
2669                 .acl_pages = pages,
2670                 .acl_len = buflen,
2671         };
2672         size_t resp_len = buflen;
2673         void *resp_buf;
2674         struct rpc_message msg = {
2675                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2676                 .rpc_argp = &args,
2677                 .rpc_resp = &resp_len,
2678         };
2679         struct page *localpage = NULL;
2680         int ret;
2681
2682         if (buflen < PAGE_SIZE) {
2683                 /* As long as we're doing a round trip to the server anyway,
2684                  * let's be prepared for a page of acl data. */
2685                 localpage = alloc_page(GFP_KERNEL);
2686                 resp_buf = page_address(localpage);
2687                 if (localpage == NULL)
2688                         return -ENOMEM;
2689                 args.acl_pages[0] = localpage;
2690                 args.acl_pgbase = 0;
2691                 resp_len = args.acl_len = PAGE_SIZE;
2692         } else {
2693                 resp_buf = buf;
2694                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2695         }
2696         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2697         if (ret)
2698                 goto out_free;
2699         if (resp_len > args.acl_len)
2700                 nfs4_write_cached_acl(inode, NULL, resp_len);
2701         else
2702                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2703         if (buf) {
2704                 ret = -ERANGE;
2705                 if (resp_len > buflen)
2706                         goto out_free;
2707                 if (localpage)
2708                         memcpy(buf, resp_buf, resp_len);
2709         }
2710         ret = resp_len;
2711 out_free:
2712         if (localpage)
2713                 __free_page(localpage);
2714         return ret;
2715 }
2716
2717 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2718 {
2719         struct nfs4_exception exception = { };
2720         ssize_t ret;
2721         do {
2722                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2723                 if (ret >= 0)
2724                         break;
2725                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2726         } while (exception.retry);
2727         return ret;
2728 }
2729
2730 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2731 {
2732         struct nfs_server *server = NFS_SERVER(inode);
2733         int ret;
2734
2735         if (!nfs4_server_supports_acls(server))
2736                 return -EOPNOTSUPP;
2737         ret = nfs_revalidate_inode(server, inode);
2738         if (ret < 0)
2739                 return ret;
2740         ret = nfs4_read_cached_acl(inode, buf, buflen);
2741         if (ret != -ENOENT)
2742                 return ret;
2743         return nfs4_get_acl_uncached(inode, buf, buflen);
2744 }
2745
2746 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2747 {
2748         struct nfs_server *server = NFS_SERVER(inode);
2749         struct page *pages[NFS4ACL_MAXPAGES];
2750         struct nfs_setaclargs arg = {
2751                 .fh             = NFS_FH(inode),
2752                 .acl_pages      = pages,
2753                 .acl_len        = buflen,
2754         };
2755         struct rpc_message msg = {
2756                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2757                 .rpc_argp       = &arg,
2758                 .rpc_resp       = NULL,
2759         };
2760         int ret;
2761
2762         if (!nfs4_server_supports_acls(server))
2763                 return -EOPNOTSUPP;
2764         nfs_inode_return_delegation(inode);
2765         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2766         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2767         nfs_zap_caches(inode);
2768         return ret;
2769 }
2770
2771 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2772 {
2773         struct nfs4_exception exception = { };
2774         int err;
2775         do {
2776                 err = nfs4_handle_exception(NFS_SERVER(inode),
2777                                 __nfs4_proc_set_acl(inode, buf, buflen),
2778                                 &exception);
2779         } while (exception.retry);
2780         return err;
2781 }
2782
2783 static int
2784 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2785 {
2786         struct nfs_client *clp = server->nfs_client;
2787
2788         if (!clp || task->tk_status >= 0)
2789                 return 0;
2790         switch(task->tk_status) {
2791                 case -NFS4ERR_STALE_CLIENTID:
2792                 case -NFS4ERR_STALE_STATEID:
2793                 case -NFS4ERR_EXPIRED:
2794                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2795                         nfs4_schedule_state_recovery(clp);
2796                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2797                                 rpc_wake_up_task(task);
2798                         task->tk_status = 0;
2799                         return -EAGAIN;
2800                 case -NFS4ERR_DELAY:
2801                         nfs_inc_server_stats((struct nfs_server *) server,
2802                                                 NFSIOS_DELAY);
2803                 case -NFS4ERR_GRACE:
2804                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2805                         task->tk_status = 0;
2806                         return -EAGAIN;
2807                 case -NFS4ERR_OLD_STATEID:
2808                         task->tk_status = 0;
2809                         return -EAGAIN;
2810         }
2811         task->tk_status = nfs4_map_errors(task->tk_status);
2812         return 0;
2813 }
2814
2815 static int nfs4_wait_bit_interruptible(void *word)
2816 {
2817         if (signal_pending(current))
2818                 return -ERESTARTSYS;
2819         schedule();
2820         return 0;
2821 }
2822
2823 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2824 {
2825         sigset_t oldset;
2826         int res;
2827
2828         might_sleep();
2829
2830         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2831
2832         rpc_clnt_sigmask(clnt, &oldset);
2833         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2834                         nfs4_wait_bit_interruptible,
2835                         TASK_INTERRUPTIBLE);
2836         rpc_clnt_sigunmask(clnt, &oldset);
2837
2838         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2839         return res;
2840 }
2841
2842 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2843 {
2844         sigset_t oldset;
2845         int res = 0;
2846
2847         might_sleep();
2848
2849         if (*timeout <= 0)
2850                 *timeout = NFS4_POLL_RETRY_MIN;
2851         if (*timeout > NFS4_POLL_RETRY_MAX)
2852                 *timeout = NFS4_POLL_RETRY_MAX;
2853         rpc_clnt_sigmask(clnt, &oldset);
2854         if (clnt->cl_intr) {
2855                 schedule_timeout_interruptible(*timeout);
2856                 if (signalled())
2857                         res = -ERESTARTSYS;
2858         } else
2859                 schedule_timeout_uninterruptible(*timeout);
2860         rpc_clnt_sigunmask(clnt, &oldset);
2861         *timeout <<= 1;
2862         return res;
2863 }
2864
2865 /* This is the error handling routine for processes that are allowed
2866  * to sleep.
2867  */
2868 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2869 {
2870         struct nfs_client *clp = server->nfs_client;
2871         int ret = errorcode;
2872
2873         exception->retry = 0;
2874         switch(errorcode) {
2875                 case 0:
2876                         return 0;
2877                 case -NFS4ERR_STALE_CLIENTID:
2878                 case -NFS4ERR_STALE_STATEID:
2879                 case -NFS4ERR_EXPIRED:
2880                         nfs4_schedule_state_recovery(clp);
2881                         ret = nfs4_wait_clnt_recover(server->client, clp);
2882                         if (ret == 0)
2883                                 exception->retry = 1;
2884                         break;
2885                 case -NFS4ERR_FILE_OPEN:
2886                 case -NFS4ERR_GRACE:
2887                 case -NFS4ERR_DELAY:
2888                         ret = nfs4_delay(server->client, &exception->timeout);
2889                         if (ret != 0)
2890                                 break;
2891                 case -NFS4ERR_OLD_STATEID:
2892                         exception->retry = 1;
2893         }
2894         /* We failed to handle the error */
2895         return nfs4_map_errors(ret);
2896 }
2897
2898 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2899 {
2900         nfs4_verifier sc_verifier;
2901         struct nfs4_setclientid setclientid = {
2902                 .sc_verifier = &sc_verifier,
2903                 .sc_prog = program,
2904         };
2905         struct rpc_message msg = {
2906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2907                 .rpc_argp = &setclientid,
2908                 .rpc_resp = clp,
2909                 .rpc_cred = cred,
2910         };
2911         __be32 *p;
2912         int loop = 0;
2913         int status;
2914
2915         p = (__be32*)sc_verifier.data;
2916         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2917         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2918
2919         for(;;) {
2920                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2921                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2922                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2923                                 cred->cr_ops->cr_name,
2924                                 clp->cl_id_uniquifier);
2925                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2926                                 sizeof(setclientid.sc_netid), "tcp");
2927                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2928                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2929                                 clp->cl_ipaddr, port >> 8, port & 255);
2930
2931                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2932                 if (status != -NFS4ERR_CLID_INUSE)
2933                         break;
2934                 if (signalled())
2935                         break;
2936                 if (loop++ & 1)
2937                         ssleep(clp->cl_lease_time + 1);
2938                 else
2939                         if (++clp->cl_id_uniquifier == 0)
2940                                 break;
2941         }
2942         return status;
2943 }
2944
2945 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2946 {
2947         struct nfs_fsinfo fsinfo;
2948         struct rpc_message msg = {
2949                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2950                 .rpc_argp = clp,
2951                 .rpc_resp = &fsinfo,
2952                 .rpc_cred = cred,
2953         };
2954         unsigned long now;
2955         int status;
2956
2957         now = jiffies;
2958         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2959         if (status == 0) {
2960                 spin_lock(&clp->cl_lock);
2961                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2962                 clp->cl_last_renewal = now;
2963                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2964                 spin_unlock(&clp->cl_lock);
2965         }
2966         return status;
2967 }
2968
2969 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2970 {
2971         long timeout;
2972         int err;
2973         do {
2974                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2975                 switch (err) {
2976                         case 0:
2977                                 return err;
2978                         case -NFS4ERR_RESOURCE:
2979                                 /* The IBM lawyers misread another document! */
2980                         case -NFS4ERR_DELAY:
2981                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2982                 }
2983         } while (err == 0);
2984         return err;
2985 }
2986
2987 struct nfs4_delegreturndata {
2988         struct nfs4_delegreturnargs args;
2989         struct nfs4_delegreturnres res;
2990         struct nfs_fh fh;
2991         nfs4_stateid stateid;
2992         struct rpc_cred *cred;
2993         unsigned long timestamp;
2994         struct nfs_fattr fattr;
2995         int rpc_status;
2996 };
2997
2998 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2999 {
3000         struct nfs4_delegreturndata *data = calldata;
3001         struct rpc_message msg = {
3002                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3003                 .rpc_argp = &data->args,
3004                 .rpc_resp = &data->res,
3005                 .rpc_cred = data->cred,
3006         };
3007         nfs_fattr_init(data->res.fattr);
3008         rpc_call_setup(task, &msg, 0);
3009 }
3010
3011 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3012 {
3013         struct nfs4_delegreturndata *data = calldata;
3014         data->rpc_status = task->tk_status;
3015         if (data->rpc_status == 0)
3016                 renew_lease(data->res.server, data->timestamp);
3017 }
3018
3019 static void nfs4_delegreturn_release(void *calldata)
3020 {
3021         struct nfs4_delegreturndata *data = calldata;
3022
3023         put_rpccred(data->cred);
3024         kfree(calldata);
3025 }
3026
3027 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3028         .rpc_call_prepare = nfs4_delegreturn_prepare,
3029         .rpc_call_done = nfs4_delegreturn_done,
3030         .rpc_release = nfs4_delegreturn_release,
3031 };
3032
3033 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3034 {
3035         struct nfs4_delegreturndata *data;
3036         struct nfs_server *server = NFS_SERVER(inode);
3037         struct rpc_task *task;
3038         int status;
3039
3040         data = kmalloc(sizeof(*data), GFP_KERNEL);
3041         if (data == NULL)
3042                 return -ENOMEM;
3043         data->args.fhandle = &data->fh;
3044         data->args.stateid = &data->stateid;
3045         data->args.bitmask = server->attr_bitmask;
3046         nfs_copy_fh(&data->fh, NFS_FH(inode));
3047         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3048         data->res.fattr = &data->fattr;
3049         data->res.server = server;
3050         data->cred = get_rpccred(cred);
3051         data->timestamp = jiffies;
3052         data->rpc_status = 0;
3053
3054         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3055         if (IS_ERR(task))
3056                 return PTR_ERR(task);
3057         status = nfs4_wait_for_completion_rpc_task(task);
3058         if (status == 0) {
3059                 status = data->rpc_status;
3060                 if (status == 0)
3061                         nfs_post_op_update_inode(inode, &data->fattr);
3062         }
3063         rpc_put_task(task);
3064         return status;
3065 }
3066
3067 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3068 {
3069         struct nfs_server *server = NFS_SERVER(inode);
3070         struct nfs4_exception exception = { };
3071         int err;
3072         do {
3073                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3074                 switch (err) {
3075                         case -NFS4ERR_STALE_STATEID:
3076                         case -NFS4ERR_EXPIRED:
3077                         case 0:
3078                                 return 0;
3079                 }
3080                 err = nfs4_handle_exception(server, err, &exception);
3081         } while (exception.retry);
3082         return err;
3083 }
3084
3085 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3086 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3087
3088 /*
3089  * sleep, with exponential backoff, and retry the LOCK operation.
3090  */
3091 static unsigned long
3092 nfs4_set_lock_task_retry(unsigned long timeout)
3093 {
3094         schedule_timeout_interruptible(timeout);
3095         timeout <<= 1;
3096         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3097                 return NFS4_LOCK_MAXTIMEOUT;
3098         return timeout;
3099 }
3100
3101 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3102 {
3103         struct inode *inode = state->inode;
3104         struct nfs_server *server = NFS_SERVER(inode);
3105         struct nfs_client *clp = server->nfs_client;
3106         struct nfs_lockt_args arg = {
3107                 .fh = NFS_FH(inode),
3108                 .fl = request,
3109         };
3110         struct nfs_lockt_res res = {
3111                 .denied = request,
3112         };
3113         struct rpc_message msg = {
3114                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3115                 .rpc_argp       = &arg,
3116                 .rpc_resp       = &res,
3117                 .rpc_cred       = state->owner->so_cred,
3118         };
3119         struct nfs4_lock_state *lsp;
3120         int status;
3121
3122         down_read(&clp->cl_sem);
3123         arg.lock_owner.clientid = clp->cl_clientid;
3124         status = nfs4_set_lock_state(state, request);
3125         if (status != 0)
3126                 goto out;
3127         lsp = request->fl_u.nfs4_fl.owner;
3128         arg.lock_owner.id = lsp->ls_id.id;
3129         status = rpc_call_sync(server->client, &msg, 0);
3130         switch (status) {
3131                 case 0:
3132                         request->fl_type = F_UNLCK;
3133                         break;
3134                 case -NFS4ERR_DENIED:
3135                         status = 0;
3136         }
3137         request->fl_ops->fl_release_private(request);
3138 out:
3139         up_read(&clp->cl_sem);
3140         return status;
3141 }
3142
3143 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3144 {
3145         struct nfs4_exception exception = { };
3146         int err;
3147
3148         do {
3149                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3150                                 _nfs4_proc_getlk(state, cmd, request),
3151                                 &exception);
3152         } while (exception.retry);
3153         return err;
3154 }
3155
3156 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3157 {
3158         int res = 0;
3159         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3160                 case FL_POSIX:
3161                         res = posix_lock_file_wait(file, fl);
3162                         break;
3163                 case FL_FLOCK:
3164                         res = flock_lock_file_wait(file, fl);
3165                         break;
3166                 default:
3167                         BUG();
3168         }
3169         return res;
3170 }
3171
3172 struct nfs4_unlockdata {
3173         struct nfs_locku_args arg;
3174         struct nfs_locku_res res;
3175         struct nfs4_lock_state *lsp;
3176         struct nfs_open_context *ctx;
3177         struct file_lock fl;
3178         const struct nfs_server *server;
3179         unsigned long timestamp;
3180 };
3181
3182 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3183                 struct nfs_open_context *ctx,
3184                 struct nfs4_lock_state *lsp,
3185                 struct nfs_seqid *seqid)
3186 {
3187         struct nfs4_unlockdata *p;
3188         struct inode *inode = lsp->ls_state->inode;
3189
3190         p = kmalloc(sizeof(*p), GFP_KERNEL);
3191         if (p == NULL)
3192                 return NULL;
3193         p->arg.fh = NFS_FH(inode);
3194         p->arg.fl = &p->fl;
3195         p->arg.seqid = seqid;
3196         p->arg.stateid = &lsp->ls_stateid;
3197         p->lsp = lsp;
3198         atomic_inc(&lsp->ls_count);
3199         /* Ensure we don't close file until we're done freeing locks! */
3200         p->ctx = get_nfs_open_context(ctx);
3201         memcpy(&p->fl, fl, sizeof(p->fl));
3202         p->server = NFS_SERVER(inode);
3203         return p;
3204 }
3205
3206 static void nfs4_locku_release_calldata(void *data)
3207 {
3208         struct nfs4_unlockdata *calldata = data;
3209         nfs_free_seqid(calldata->arg.seqid);
3210         nfs4_put_lock_state(calldata->lsp);
3211         put_nfs_open_context(calldata->ctx);
3212         kfree(calldata);
3213 }
3214
3215 static void nfs4_locku_done(struct rpc_task *task, void *data)
3216 {
3217         struct nfs4_unlockdata *calldata = data;
3218
3219         if (RPC_ASSASSINATED(task))
3220                 return;
3221         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3222         switch (task->tk_status) {
3223                 case 0:
3224                         memcpy(calldata->lsp->ls_stateid.data,
3225                                         calldata->res.stateid.data,
3226                                         sizeof(calldata->lsp->ls_stateid.data));
3227                         renew_lease(calldata->server, calldata->timestamp);
3228                         break;
3229                 case -NFS4ERR_STALE_STATEID:
3230                 case -NFS4ERR_EXPIRED:
3231                         break;
3232                 default:
3233                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3234                                 rpc_restart_call(task);
3235         }
3236 }
3237
3238 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3239 {
3240         struct nfs4_unlockdata *calldata = data;
3241         struct rpc_message msg = {
3242                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3243                 .rpc_argp       = &calldata->arg,
3244                 .rpc_resp       = &calldata->res,
3245                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3246         };
3247
3248         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3249                 return;
3250         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3251                 /* Note: exit _without_ running nfs4_locku_done */
3252                 task->tk_action = NULL;
3253                 return;
3254         }
3255         calldata->timestamp = jiffies;
3256         rpc_call_setup(task, &msg, 0);
3257 }
3258
3259 static const struct rpc_call_ops nfs4_locku_ops = {
3260         .rpc_call_prepare = nfs4_locku_prepare,
3261         .rpc_call_done = nfs4_locku_done,
3262         .rpc_release = nfs4_locku_release_calldata,
3263 };
3264
3265 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3266                 struct nfs_open_context *ctx,
3267                 struct nfs4_lock_state *lsp,
3268                 struct nfs_seqid *seqid)
3269 {
3270         struct nfs4_unlockdata *data;
3271
3272         /* Ensure this is an unlock - when canceling a lock, the
3273          * canceled lock is passed in, and it won't be an unlock.
3274          */
3275         fl->fl_type = F_UNLCK;
3276
3277         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3278         if (data == NULL) {
3279                 nfs_free_seqid(seqid);
3280                 return ERR_PTR(-ENOMEM);
3281         }
3282
3283         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3284 }
3285
3286 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3287 {
3288         struct nfs_seqid *seqid;
3289         struct nfs4_lock_state *lsp;
3290         struct rpc_task *task;
3291         int status = 0;
3292
3293         status = nfs4_set_lock_state(state, request);
3294         /* Unlock _before_ we do the RPC call */
3295         request->fl_flags |= FL_EXISTS;
3296         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3297                 goto out;
3298         if (status != 0)
3299                 goto out;
3300         /* Is this a delegated lock? */
3301         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3302                 goto out;
3303         lsp = request->fl_u.nfs4_fl.owner;
3304         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3305         status = -ENOMEM;
3306         if (seqid == NULL)
3307                 goto out;
3308         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3309         status = PTR_ERR(task);
3310         if (IS_ERR(task))
3311                 goto out;
3312         status = nfs4_wait_for_completion_rpc_task(task);
3313         rpc_put_task(task);
3314 out:
3315         return status;
3316 }
3317
3318 struct nfs4_lockdata {
3319         struct nfs_lock_args arg;
3320         struct nfs_lock_res res;
3321         struct nfs4_lock_state *lsp;
3322         struct nfs_open_context *ctx;
3323         struct file_lock fl;
3324         unsigned long timestamp;
3325         int rpc_status;
3326         int cancelled;
3327 };
3328
3329 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3330                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3331 {
3332         struct nfs4_lockdata *p;
3333         struct inode *inode = lsp->ls_state->inode;
3334         struct nfs_server *server = NFS_SERVER(inode);
3335
3336         p = kzalloc(sizeof(*p), GFP_KERNEL);
3337         if (p == NULL)
3338                 return NULL;
3339
3340         p->arg.fh = NFS_FH(inode);
3341         p->arg.fl = &p->fl;
3342         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3343         if (p->arg.lock_seqid == NULL)
3344                 goto out_free;
3345         p->arg.lock_stateid = &lsp->ls_stateid;
3346         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3347         p->arg.lock_owner.id = lsp->ls_id.id;
3348         p->lsp = lsp;
3349         atomic_inc(&lsp->ls_count);
3350         p->ctx = get_nfs_open_context(ctx);
3351         memcpy(&p->fl, fl, sizeof(p->fl));
3352         return p;
3353 out_free:
3354         kfree(p);
3355         return NULL;
3356 }
3357
3358 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3359 {
3360         struct nfs4_lockdata *data = calldata;
3361         struct nfs4_state *state = data->lsp->ls_state;
3362         struct nfs4_state_owner *sp = state->owner;
3363         struct rpc_message msg = {
3364                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3365                 .rpc_argp = &data->arg,
3366                 .rpc_resp = &data->res,
3367                 .rpc_cred = sp->so_cred,
3368         };
3369
3370         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3371                 return;
3372         dprintk("%s: begin!\n", __FUNCTION__);
3373         /* Do we need to do an open_to_lock_owner? */
3374         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3375                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3376                 if (data->arg.open_seqid == NULL) {
3377                         data->rpc_status = -ENOMEM;
3378                         task->tk_action = NULL;
3379                         goto out;
3380                 }
3381                 data->arg.open_stateid = &state->stateid;
3382                 data->arg.new_lock_owner = 1;
3383         }
3384         data->timestamp = jiffies;
3385         rpc_call_setup(task, &msg, 0);
3386 out:
3387         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3388 }
3389
3390 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3391 {
3392         struct nfs4_lockdata *data = calldata;
3393
3394         dprintk("%s: begin!\n", __FUNCTION__);
3395
3396         data->rpc_status = task->tk_status;
3397         if (RPC_ASSASSINATED(task))
3398                 goto out;
3399         if (data->arg.new_lock_owner != 0) {
3400                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3401                 if (data->rpc_status == 0)
3402                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3403                 else
3404                         goto out;
3405         }
3406         if (data->rpc_status == 0) {
3407                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3408                                         sizeof(data->lsp->ls_stateid.data));
3409                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3410                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3411         }
3412         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3413 out:
3414         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3415 }
3416
3417 static void nfs4_lock_release(void *calldata)
3418 {
3419         struct nfs4_lockdata *data = calldata;
3420
3421         dprintk("%s: begin!\n", __FUNCTION__);
3422         if (data->arg.open_seqid != NULL)
3423                 nfs_free_seqid(data->arg.open_seqid);
3424         if (data->cancelled != 0) {
3425                 struct rpc_task *task;
3426                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3427                                 data->arg.lock_seqid);
3428                 if (!IS_ERR(task))
3429                         rpc_put_task(task);
3430                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3431         } else
3432                 nfs_free_seqid(data->arg.lock_seqid);
3433         nfs4_put_lock_state(data->lsp);
3434         put_nfs_open_context(data->ctx);
3435         kfree(data);
3436         dprintk("%s: done!\n", __FUNCTION__);
3437 }
3438
3439 static const struct rpc_call_ops nfs4_lock_ops = {
3440         .rpc_call_prepare = nfs4_lock_prepare,
3441         .rpc_call_done = nfs4_lock_done,
3442         .rpc_release = nfs4_lock_release,
3443 };
3444
3445 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3446 {
3447         struct nfs4_lockdata *data;
3448         struct rpc_task *task;
3449         int ret;
3450
3451         dprintk("%s: begin!\n", __FUNCTION__);
3452         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3453                         fl->fl_u.nfs4_fl.owner);
3454         if (data == NULL)
3455                 return -ENOMEM;
3456         if (IS_SETLKW(cmd))
3457                 data->arg.block = 1;
3458         if (reclaim != 0)
3459                 data->arg.reclaim = 1;
3460         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3461                         &nfs4_lock_ops, data);
3462         if (IS_ERR(task))
3463                 return PTR_ERR(task);
3464         ret = nfs4_wait_for_completion_rpc_task(task);
3465         if (ret == 0) {
3466                 ret = data->rpc_status;
3467                 if (ret == -NFS4ERR_DENIED)
3468                         ret = -EAGAIN;
3469         } else
3470                 data->cancelled = 1;
3471         rpc_put_task(task);
3472         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3473         return ret;
3474 }
3475
3476 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3477 {
3478         struct nfs_server *server = NFS_SERVER(state->inode);
3479         struct nfs4_exception exception = { };
3480         int err;
3481
3482         do {
3483                 /* Cache the lock if possible... */
3484                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3485                         return 0;
3486                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3487                 if (err != -NFS4ERR_DELAY)
3488                         break;
3489                 nfs4_handle_exception(server, err, &exception);
3490         } while (exception.retry);
3491         return err;
3492 }
3493
3494 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3495 {
3496         struct nfs_server *server = NFS_SERVER(state->inode);
3497         struct nfs4_exception exception = { };
3498         int err;
3499
3500         err = nfs4_set_lock_state(state, request);
3501         if (err != 0)
3502                 return err;
3503         do {
3504                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3505                         return 0;
3506                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3507                 if (err != -NFS4ERR_DELAY)
3508                         break;
3509                 nfs4_handle_exception(server, err, &exception);
3510         } while (exception.retry);
3511         return err;
3512 }
3513
3514 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3515 {
3516         struct nfs_client *clp = state->owner->so_client;
3517         unsigned char fl_flags = request->fl_flags;
3518         int status;
3519
3520         /* Is this a delegated open? */
3521         status = nfs4_set_lock_state(state, request);
3522         if (status != 0)
3523                 goto out;
3524         request->fl_flags |= FL_ACCESS;
3525         status = do_vfs_lock(request->fl_file, request);
3526         if (status < 0)
3527                 goto out;
3528         down_read(&clp->cl_sem);
3529         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3530                 struct nfs_inode *nfsi = NFS_I(state->inode);
3531                 /* Yes: cache locks! */
3532                 down_read(&nfsi->rwsem);
3533                 /* ...but avoid races with delegation recall... */
3534                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3535                         request->fl_flags = fl_flags & ~FL_SLEEP;
3536                         status = do_vfs_lock(request->fl_file, request);
3537                         up_read(&nfsi->rwsem);
3538                         goto out_unlock;
3539                 }
3540                 up_read(&nfsi->rwsem);
3541         }
3542         status = _nfs4_do_setlk(state, cmd, request, 0);
3543         if (status != 0)
3544                 goto out_unlock;
3545         /* Note: we always want to sleep here! */
3546         request->fl_flags = fl_flags | FL_SLEEP;
3547         if (do_vfs_lock(request->fl_file, request) < 0)
3548                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3549 out_unlock:
3550         up_read(&clp->cl_sem);
3551 out:
3552         request->fl_flags = fl_flags;
3553         return status;
3554 }
3555
3556 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3557 {
3558         struct nfs4_exception exception = { };
3559         int err;
3560
3561         do {
3562                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3563                                 _nfs4_proc_setlk(state, cmd, request),
3564                                 &exception);
3565         } while (exception.retry);
3566         return err;
3567 }
3568
3569 static int
3570 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3571 {
3572         struct nfs_open_context *ctx;
3573         struct nfs4_state *state;
3574         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3575         int status;
3576
3577         /* verify open state */
3578         ctx = (struct nfs_open_context *)filp->private_data;
3579         state = ctx->state;
3580
3581         if (request->fl_start < 0 || request->fl_end < 0)
3582                 return -EINVAL;
3583
3584         if (IS_GETLK(cmd))
3585                 return nfs4_proc_getlk(state, F_GETLK, request);
3586
3587         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3588                 return -EINVAL;
3589
3590         if (request->fl_type == F_UNLCK)
3591                 return nfs4_proc_unlck(state, cmd, request);
3592
3593         do {
3594                 status = nfs4_proc_setlk(state, cmd, request);
3595                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3596                         break;
3597                 timeout = nfs4_set_lock_task_retry(timeout);
3598                 status = -ERESTARTSYS;
3599                 if (signalled())
3600                         break;
3601         } while(status < 0);
3602         return status;
3603 }
3604
3605 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3606 {
3607         struct nfs_server *server = NFS_SERVER(state->inode);
3608         struct nfs4_exception exception = { };
3609         int err;
3610
3611         err = nfs4_set_lock_state(state, fl);
3612         if (err != 0)
3613                 goto out;
3614         do {
3615                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3616                 if (err != -NFS4ERR_DELAY)
3617                         break;
3618                 err = nfs4_handle_exception(server, err, &exception);
3619         } while (exception.retry);
3620 out:
3621         return err;
3622 }
3623
3624 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3625
3626 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3627                 size_t buflen, int flags)
3628 {
3629         struct inode *inode = dentry->d_inode;
3630
3631         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3632                 return -EOPNOTSUPP;
3633
3634         if (!S_ISREG(inode->i_mode) &&
3635             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3636                 return -EPERM;
3637
3638         return nfs4_proc_set_acl(inode, buf, buflen);
3639 }
3640
3641 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3642  * and that's what we'll do for e.g. user attributes that haven't been set.
3643  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3644  * attributes in kernel-managed attribute namespaces. */
3645 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3646                 size_t buflen)
3647 {
3648         struct inode *inode = dentry->d_inode;
3649
3650         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3651                 return -EOPNOTSUPP;
3652
3653         return nfs4_proc_get_acl(inode, buf, buflen);
3654 }
3655
3656 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3657 {
3658         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3659
3660         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3661                 return 0;
3662         if (buf && buflen < len)
3663                 return -ERANGE;
3664         if (buf)
3665                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3666         return len;
3667 }
3668
3669 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3670                 struct nfs4_fs_locations *fs_locations, struct page *page)
3671 {
3672         struct nfs_server *server = NFS_SERVER(dir);
3673         u32 bitmask[2] = {
3674                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3675                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3676         };
3677         struct nfs4_fs_locations_arg args = {
3678                 .dir_fh = NFS_FH(dir),
3679                 .name = name,
3680                 .page = page,
3681                 .bitmask = bitmask,
3682         };
3683         struct rpc_message msg = {
3684                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3685                 .rpc_argp = &args,
3686                 .rpc_resp = fs_locations,
3687         };
3688         int status;
3689
3690         dprintk("%s: start\n", __FUNCTION__);
3691         nfs_fattr_init(&fs_locations->fattr);
3692         fs_locations->server = server;
3693         fs_locations->nlocations = 0;
3694         status = rpc_call_sync(server->client, &msg, 0);
3695         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3696         return status;
3697 }
3698
3699 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3700         .recover_open   = nfs4_open_reclaim,
3701         .recover_lock   = nfs4_lock_reclaim,
3702 };
3703
3704 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3705         .recover_open   = nfs4_open_expired,
3706         .recover_lock   = nfs4_lock_expired,
3707 };
3708
3709 static const struct inode_operations nfs4_file_inode_operations = {
3710         .permission     = nfs_permission,
3711         .getattr        = nfs_getattr,
3712         .setattr        = nfs_setattr,
3713         .getxattr       = nfs4_getxattr,
3714         .setxattr       = nfs4_setxattr,
3715         .listxattr      = nfs4_listxattr,
3716 };
3717
3718 const struct nfs_rpc_ops nfs_v4_clientops = {
3719         .version        = 4,                    /* protocol version */
3720         .dentry_ops     = &nfs4_dentry_operations,
3721         .dir_inode_ops  = &nfs4_dir_inode_operations,
3722         .file_inode_ops = &nfs4_file_inode_operations,
3723         .getroot        = nfs4_proc_get_root,
3724         .getattr        = nfs4_proc_getattr,
3725         .setattr        = nfs4_proc_setattr,
3726         .lookupfh       = nfs4_proc_lookupfh,
3727         .lookup         = nfs4_proc_lookup,
3728         .access         = nfs4_proc_access,
3729         .readlink       = nfs4_proc_readlink,
3730         .create         = nfs4_proc_create,
3731         .remove         = nfs4_proc_remove,
3732         .unlink_setup   = nfs4_proc_unlink_setup,
3733         .unlink_done    = nfs4_proc_unlink_done,
3734         .rename         = nfs4_proc_rename,
3735         .link           = nfs4_proc_link,
3736         .symlink        = nfs4_proc_symlink,
3737         .mkdir          = nfs4_proc_mkdir,
3738         .rmdir          = nfs4_proc_remove,
3739         .readdir        = nfs4_proc_readdir,
3740         .mknod          = nfs4_proc_mknod,
3741         .statfs         = nfs4_proc_statfs,
3742         .fsinfo         = nfs4_proc_fsinfo,
3743         .pathconf       = nfs4_proc_pathconf,
3744         .set_capabilities = nfs4_server_capabilities,
3745         .decode_dirent  = nfs4_decode_dirent,
3746         .read_setup     = nfs4_proc_read_setup,
3747         .read_done      = nfs4_read_done,
3748         .write_setup    = nfs4_proc_write_setup,
3749         .write_done     = nfs4_write_done,
3750         .commit_setup   = nfs4_proc_commit_setup,
3751         .commit_done    = nfs4_commit_done,
3752         .file_open      = nfs_open,
3753         .file_release   = nfs_release,
3754         .lock           = nfs4_proc_lock,
3755         .clear_acl_cache = nfs4_zap_acl_attr,
3756 };
3757
3758 /*
3759  * Local variables:
3760  *  c-basic-offset: 8
3761  * End:
3762  */