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/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/sunrpc/clnt.h>
  43 #include <linux/nfs.h>
  44 #include <linux/nfs4.h>
  45 #include <linux/nfs_fs.h>
  46 #include <linux/nfs_page.h>
  47 #include <linux/smp_lock.h>
  48 #include <linux/namei.h>
  49
  50 #include "delegation.h"
  51
  52 #define NFSDBG_FACILITY         NFSDBG_PROC
  53
  54 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  55 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  56
  57 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  58 static int nfs4_async_handle_error(struct rpc_task *, struct nfs_server *);
  59 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  60 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  61 extern struct rpc_procinfo nfs4_procedures[];
  62
  63 extern nfs4_stateid zero_stateid;
  64
  65 /* Prevent leaks of NFSv4 errors into userland */
  66 static inline int nfs4_map_errors(int err)
  67 {
  68         if (err < -1000) {
  69                 printk(KERN_WARNING "%s could not handle NFSv4 error %d\n",
  70                                 __FUNCTION__, -err);
  71                 return -EIO;
  72         }
  73         return err;
  74 }
  75
  76 /*
  77  * This is our standard bitmap for GETATTR requests.
  78  */
  79 const u32 nfs4_fattr_bitmap[2] = {
  80         FATTR4_WORD0_TYPE
  81         | FATTR4_WORD0_CHANGE
  82         | FATTR4_WORD0_SIZE
  83         | FATTR4_WORD0_FSID
  84         | FATTR4_WORD0_FILEID,
  85         FATTR4_WORD1_MODE
  86         | FATTR4_WORD1_NUMLINKS
  87         | FATTR4_WORD1_OWNER
  88         | FATTR4_WORD1_OWNER_GROUP
  89         | FATTR4_WORD1_RAWDEV
  90         | FATTR4_WORD1_SPACE_USED
  91         | FATTR4_WORD1_TIME_ACCESS
  92         | FATTR4_WORD1_TIME_METADATA
  93         | FATTR4_WORD1_TIME_MODIFY
  94 };
  95
  96 const u32 nfs4_statfs_bitmap[2] = {
  97         FATTR4_WORD0_FILES_AVAIL
  98         | FATTR4_WORD0_FILES_FREE
  99         | FATTR4_WORD0_FILES_TOTAL,
 100         FATTR4_WORD1_SPACE_AVAIL
 101         | FATTR4_WORD1_SPACE_FREE
 102         | FATTR4_WORD1_SPACE_TOTAL
 103 };
 104
 105 u32 nfs4_pathconf_bitmap[2] = {
 106         FATTR4_WORD0_MAXLINK
 107         | FATTR4_WORD0_MAXNAME,
 108         0
 109 };
 110
 111 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 112                         | FATTR4_WORD0_MAXREAD
 113                         | FATTR4_WORD0_MAXWRITE
 114                         | FATTR4_WORD0_LEASE_TIME,
 115                         0
 116 };
 117
 118 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 119                 struct nfs4_readdir_arg *readdir)
 120 {
 121         u32 *start, *p;
 122
 123         BUG_ON(readdir->count < 80);
 124         if (cookie > 2) {
 125                 readdir->cookie = (cookie > 2) ? cookie : 0;
 126                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 127                 return;
 128         }
 129
 130         readdir->cookie = 0;
 131         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 132         if (cookie == 2)
 133                 return;
 134
 135         /*
 136          * NFSv4 servers do not return entries for '.' and '..'
 137          * Therefore, we fake these entries here.  We let '.'
 138          * have cookie 0 and '..' have cookie 1.  Note that
 139          * when talking to the server, we always send cookie 0
 140          * instead of 1 or 2.
 141          */
 142         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 143
 144         if (cookie == 0) {
 145                 *p++ = xdr_one;                                  /* next */
 146                 *p++ = xdr_zero;                   /* cookie, first word */
 147                 *p++ = xdr_one;                   /* cookie, second word */
 148                 *p++ = xdr_one;                             /* entry len */
 149                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 150                 p++;
 151                 *p++ = xdr_one;                         /* bitmap length */
 152                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 153                 *p++ = htonl(8);              /* attribute buffer length */
 154                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 155         }
 156
 157         *p++ = xdr_one;                                  /* next */
 158         *p++ = xdr_zero;                   /* cookie, first word */
 159         *p++ = xdr_two;                   /* cookie, second word */
 160         *p++ = xdr_two;                             /* entry len */
 161         memcpy(p, "..\0\0", 4);                         /* entry */
 162         p++;
 163         *p++ = xdr_one;                         /* bitmap length */
 164         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 165         *p++ = htonl(8);              /* attribute buffer length */
 166         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 167
 168         readdir->pgbase = (char *)p - (char *)start;
 169         readdir->count -= readdir->pgbase;
 170         kunmap_atomic(start, KM_USER0);
 171 }
 172
 173 static void
 174 renew_lease(struct nfs_server *server, unsigned long timestamp)
 175 {
 176         struct nfs4_client *clp = server->nfs4_state;
 177         spin_lock(&clp->cl_lock);
 178         if (time_before(clp->cl_last_renewal,timestamp))
 179                 clp->cl_last_renewal = timestamp;
 180         spin_unlock(&clp->cl_lock);
 181 }
 182
 183 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 184 {
 185         struct nfs_inode *nfsi = NFS_I(inode);
 186
 187         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 188                 nfsi->change_attr = cinfo->after;
 189 }
 190
 191 /*
 192  * OPEN_RECLAIM:
 193  *      reclaim state on the server after a reboot.
 194  *      Assumes caller is holding the sp->so_sem
 195  */
 196 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 197 {
 198         struct inode *inode = state->inode;
 199         struct nfs_server *server = NFS_SERVER(inode);
 200         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 201         struct nfs_openargs o_arg = {
 202                 .fh = NFS_FH(inode),
 203                 .seqid = sp->so_seqid,
 204                 .id = sp->so_id,
 205                 .open_flags = state->state,
 206                 .clientid = server->nfs4_state->cl_clientid,
 207                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 208                 .bitmask = server->attr_bitmask,
 209         };
 210         struct nfs_openres o_res = {
 211                 .server = server,       /* Grrr */
 212         };
 213         struct rpc_message msg = {
 214                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 215                 .rpc_argp       = &o_arg,
 216                 .rpc_resp       = &o_res,
 217                 .rpc_cred       = sp->so_cred,
 218         };
 219         int status;
 220
 221         if (delegation != NULL) {
 222                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 223                         memcpy(&state->stateid, &delegation->stateid,
 224                                         sizeof(state->stateid));
 225                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 226                         return 0;
 227                 }
 228                 o_arg.u.delegation_type = delegation->type;
 229         }
 230         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 231         nfs4_increment_seqid(status, sp);
 232         if (status == 0) {
 233                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 234                 if (o_res.delegation_type != 0) {
 235                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 236                         /* Did the server issue an immediate delegation recall? */
 237                         if (o_res.do_recall)
 238                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 239                 }
 240         }
 241         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 242         /* Ensure we update the inode attributes */
 243         NFS_CACHEINV(inode);
 244         return status;
 245 }
 246
 247 int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 248 {
 249         struct nfs_server *server = NFS_SERVER(state->inode);
 250         struct nfs4_exception exception = { };
 251         int err;
 252         do {
 253                 err = _nfs4_open_reclaim(sp, state);
 254                 switch (err) {
 255                         case 0:
 256                         case -NFS4ERR_STALE_CLIENTID:
 257                         case -NFS4ERR_STALE_STATEID:
 258                         case -NFS4ERR_EXPIRED:
 259                                 return err;
 260                 }
 261                 err = nfs4_handle_exception(server, err, &exception);
 262         } while (exception.retry);
 263         return err;
 264 }
 265
 266 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 267 {
 268         struct nfs4_state_owner  *sp  = state->owner;
 269         struct inode *inode = dentry->d_inode;
 270         struct nfs_server *server = NFS_SERVER(inode);
 271         struct dentry *parent = dget_parent(dentry);
 272         struct nfs_openargs arg = {
 273                 .fh = NFS_FH(parent->d_inode),
 274                 .clientid = server->nfs4_state->cl_clientid,
 275                 .name = &dentry->d_name,
 276                 .id = sp->so_id,
 277                 .server = server,
 278                 .bitmask = server->attr_bitmask,
 279                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
 280         };
 281         struct nfs_openres res = {
 282                 .server = server,
 283         };
 284         struct  rpc_message msg = {
 285                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 286                 .rpc_argp       = &arg,
 287                 .rpc_resp       = &res,
 288                 .rpc_cred       = sp->so_cred,
 289         };
 290         int status = 0;
 291
 292         down(&sp->so_sema);
 293         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 294                 goto out;
 295         if (state->state == 0)
 296                 goto out;
 297         arg.seqid = sp->so_seqid;
 298         arg.open_flags = state->state;
 299         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
 300         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 301         nfs4_increment_seqid(status, sp);
 302         if (status >= 0) {
 303                 memcpy(state->stateid.data, res.stateid.data,
 304                                 sizeof(state->stateid.data));
 305                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 306         }
 307 out:
 308         up(&sp->so_sema);
 309         dput(parent);
 310         return status;
 311 }
 312
 313 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 314 {
 315         struct nfs4_exception exception = { };
 316         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 317         int err;
 318         do {
 319                 err = _nfs4_open_delegation_recall(dentry, state);
 320                 switch (err) {
 321                         case 0:
 322                                 return err;
 323                         case -NFS4ERR_STALE_CLIENTID:
 324                         case -NFS4ERR_STALE_STATEID:
 325                         case -NFS4ERR_EXPIRED:
 326                                 /* Don't recall a delegation if it was lost */
 327                                 nfs4_schedule_state_recovery(server->nfs4_state);
 328                                 return err;
 329                 }
 330                 err = nfs4_handle_exception(server, err, &exception);
 331         } while (exception.retry);
 332         return err;
 333 }
 334
 335 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid)
 336 {
 337         struct nfs_open_confirmargs arg = {
 338                 .fh             = fh,
 339                 .seqid          = sp->so_seqid,
 340                 .stateid        = *stateid,
 341         };
 342         struct nfs_open_confirmres res;
 343         struct  rpc_message msg = {
 344                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 345                 .rpc_argp       = &arg,
 346                 .rpc_resp       = &res,
 347                 .rpc_cred       = sp->so_cred,
 348         };
 349         int status;
 350
 351         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
 352         nfs4_increment_seqid(status, sp);
 353         if (status >= 0)
 354                 memcpy(stateid, &res.stateid, sizeof(*stateid));
 355         return status;
 356 }
 357
 358 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int mask)
 359 {
 360         struct nfs_access_entry cache;
 361         int status;
 362
 363         status = nfs_access_get_cached(inode, cred, &cache);
 364         if (status == 0)
 365                 goto out;
 366
 367         /* Be clever: ask server to check for all possible rights */
 368         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 369         cache.cred = cred;
 370         cache.jiffies = jiffies;
 371         status = _nfs4_proc_access(inode, &cache);
 372         if (status != 0)
 373                 return status;
 374         nfs_access_add_cache(inode, &cache);
 375 out:
 376         if ((cache.mask & mask) == mask)
 377                 return 0;
 378         return -EACCES;
 379 }
 380
 381 /*
 382  * Returns an nfs4_state + an extra reference to the inode
 383  */
 384 int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 385 {
 386         struct nfs_delegation *delegation;
 387         struct nfs_server *server = NFS_SERVER(inode);
 388         struct nfs4_client *clp = server->nfs4_state;
 389         struct nfs_inode *nfsi = NFS_I(inode);
 390         struct nfs4_state_owner *sp = NULL;
 391         struct nfs4_state *state = NULL;
 392         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 393         int mask = 0;
 394         int err;
 395
 396         /* Protect against reboot recovery - NOTE ORDER! */
 397         down_read(&clp->cl_sem);
 398         /* Protect against delegation recall */
 399         down_read(&nfsi->rwsem);
 400         delegation = NFS_I(inode)->delegation;
 401         err = -ENOENT;
 402         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 403                 goto out_err;
 404         err = -ENOMEM;
 405         if (!(sp = nfs4_get_state_owner(server, cred))) {
 406                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 407                 goto out_err;
 408         }
 409         down(&sp->so_sema);
 410         state = nfs4_get_open_state(inode, sp);
 411         if (state == NULL)
 412                 goto out_err;
 413
 414         err = -ENOENT;
 415         if ((state->state & open_flags) == open_flags) {
 416                 spin_lock(&inode->i_lock);
 417                 if (open_flags & FMODE_READ)
 418                         state->nreaders++;
 419                 if (open_flags & FMODE_WRITE)
 420                         state->nwriters++;
 421                 spin_unlock(&inode->i_lock);
 422                 goto out_ok;
 423         } else if (state->state != 0)
 424                 goto out_err;
 425
 426         lock_kernel();
 427         err = _nfs4_do_access(inode, cred, mask);
 428         unlock_kernel();
 429         if (err != 0)
 430                 goto out_err;
 431         spin_lock(&inode->i_lock);
 432         memcpy(state->stateid.data, delegation->stateid.data,
 433                         sizeof(state->stateid.data));
 434         state->state |= open_flags;
 435         if (open_flags & FMODE_READ)
 436                 state->nreaders++;
 437         if (open_flags & FMODE_WRITE)
 438                 state->nwriters++;
 439         set_bit(NFS_DELEGATED_STATE, &state->flags);
 440         spin_unlock(&inode->i_lock);
 441 out_ok:
 442         up(&sp->so_sema);
 443         nfs4_put_state_owner(sp);
 444         up_read(&nfsi->rwsem);
 445         up_read(&clp->cl_sem);
 446         igrab(inode);
 447         *res = state;
 448         return 0;
 449 out_err:
 450         if (sp != NULL) {
 451                 if (state != NULL)
 452                         nfs4_put_open_state(state);
 453                 up(&sp->so_sema);
 454                 nfs4_put_state_owner(sp);
 455         }
 456         up_read(&nfsi->rwsem);
 457         up_read(&clp->cl_sem);
 458         return err;
 459 }
 460
 461 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 462 {
 463         struct nfs4_exception exception = { };
 464         struct nfs4_state *res;
 465         int err;
 466
 467         do {
 468                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 469                 if (err == 0)
 470                         break;
 471                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 472                                         err, &exception));
 473         } while (exception.retry);
 474         return res;
 475 }
 476
 477 /*
 478  * Returns an nfs4_state + an referenced inode
 479  */
 480 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 481 {
 482         struct nfs4_state_owner  *sp;
 483         struct nfs4_state     *state = NULL;
 484         struct nfs_server       *server = NFS_SERVER(dir);
 485         struct nfs4_client *clp = server->nfs4_state;
 486         struct inode *inode = NULL;
 487         int                     status;
 488         struct nfs_fattr        f_attr = {
 489                 .valid          = 0,
 490         };
 491         struct nfs_openargs o_arg = {
 492                 .fh             = NFS_FH(dir),
 493                 .open_flags     = flags,
 494                 .name           = &dentry->d_name,
 495                 .server         = server,
 496                 .bitmask = server->attr_bitmask,
 497                 .claim = NFS4_OPEN_CLAIM_NULL,
 498         };
 499         struct nfs_openres o_res = {
 500                 .f_attr         = &f_attr,
 501                 .server         = server,
 502         };
 503         struct rpc_message msg = {
 504                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 505                 .rpc_argp       = &o_arg,
 506                 .rpc_resp       = &o_res,
 507                 .rpc_cred       = cred,
 508         };
 509
 510         /* Protect against reboot recovery conflicts */
 511         down_read(&clp->cl_sem);
 512         status = -ENOMEM;
 513         if (!(sp = nfs4_get_state_owner(server, cred))) {
 514                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 515                 goto out_err;
 516         }
 517         if (flags & O_EXCL) {
 518                 u32 *p = (u32 *) o_arg.u.verifier.data;
 519                 p[0] = jiffies;
 520                 p[1] = current->pid;
 521         } else
 522                 o_arg.u.attrs = sattr;
 523         /* Serialization for the sequence id */
 524         down(&sp->so_sema);
 525         o_arg.seqid = sp->so_seqid;
 526         o_arg.id = sp->so_id;
 527         o_arg.clientid = clp->cl_clientid,
 528
 529         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 530         nfs4_increment_seqid(status, sp);
 531         if (status)
 532                 goto out_err;
 533         update_changeattr(dir, &o_res.cinfo);
 534         if(o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 535                 status = _nfs4_proc_open_confirm(server->client, &o_res.fh,
 536                                 sp, &o_res.stateid);
 537                 if (status != 0)
 538                         goto out_err;
 539         }
 540         if (!(f_attr.valid & NFS_ATTR_FATTR)) {
 541                 status = server->rpc_ops->getattr(server, &o_res.fh, &f_attr);
 542                 if (status < 0)
 543                         goto out_err;
 544         }
 545
 546         status = -ENOMEM;
 547         inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
 548         if (!inode)
 549                 goto out_err;
 550         state = nfs4_get_open_state(inode, sp);
 551         if (!state)
 552                 goto out_err;
 553         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 554         spin_lock(&inode->i_lock);
 555         if (flags & FMODE_READ)
 556                 state->nreaders++;
 557         if (flags & FMODE_WRITE)
 558                 state->nwriters++;
 559         state->state |= flags & (FMODE_READ|FMODE_WRITE);
 560         spin_unlock(&inode->i_lock);
 561         if (o_res.delegation_type != 0)
 562                 nfs_inode_set_delegation(inode, cred, &o_res);
 563         up(&sp->so_sema);
 564         nfs4_put_state_owner(sp);
 565         up_read(&clp->cl_sem);
 566         *res = state;
 567         return 0;
 568 out_err:
 569         if (sp != NULL) {
 570                 if (state != NULL)
 571                         nfs4_put_open_state(state);
 572                 up(&sp->so_sema);
 573                 nfs4_put_state_owner(sp);
 574         }
 575         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 576         up_read(&clp->cl_sem);
 577         if (inode != NULL)
 578                 iput(inode);
 579         *res = NULL;
 580         return status;
 581 }
 582
 583
 584 struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 585 {
 586         struct nfs4_exception exception = { };
 587         struct nfs4_state *res;
 588         int status;
 589
 590         do {
 591                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 592                 if (status == 0)
 593                         break;
 594                 /* NOTE: BAD_SEQID means the server and client disagree about the
 595                  * book-keeping w.r.t. state-changing operations
 596                  * (OPEN/CLOSE/LOCK/LOCKU...)
 597                  * It is actually a sign of a bug on the client or on the server.
 598                  *
 599                  * If we receive a BAD_SEQID error in the particular case of
 600                  * doing an OPEN, we assume that nfs4_increment_seqid() will
 601                  * have unhashed the old state_owner for us, and that we can
 602                  * therefore safely retry using a new one. We should still warn
 603                  * the user though...
 604                  */
 605                 if (status == -NFS4ERR_BAD_SEQID) {
 606                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 607                         exception.retry = 1;
 608                         continue;
 609                 }
 610                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 611                                         status, &exception));
 612         } while (exception.retry);
 613         return res;
 614 }
 615
 616 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 617                 struct nfs_fh *fhandle, struct iattr *sattr,
 618                 struct nfs4_state *state)
 619 {
 620         struct nfs_setattrargs  arg = {
 621                 .fh             = fhandle,
 622                 .iap            = sattr,
 623                 .server         = server,
 624                 .bitmask = server->attr_bitmask,
 625         };
 626         struct nfs_setattrres  res = {
 627                 .fattr          = fattr,
 628                 .server         = server,
 629         };
 630         struct rpc_message msg = {
 631                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
 632                 .rpc_argp       = &arg,
 633                 .rpc_resp       = &res,
 634         };
 635
 636         fattr->valid = 0;
 637
 638         if (state != NULL)
 639                 msg.rpc_cred = state->owner->so_cred;
 640         if (sattr->ia_valid & ATTR_SIZE)
 641                 nfs4_copy_stateid(&arg.stateid, state, NULL);
 642         else
 643                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
 644
 645         return rpc_call_sync(server->client, &msg, 0);
 646 }
 647
 648 int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 649                 struct nfs_fh *fhandle, struct iattr *sattr,
 650                 struct nfs4_state *state)
 651 {
 652         struct nfs4_exception exception = { };
 653         int err;
 654         do {
 655                 err = nfs4_handle_exception(server,
 656                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
 657                                         state),
 658                                 &exception);
 659         } while (exception.retry);
 660         return err;
 661 }
 662
 663 struct nfs4_closedata {
 664         struct inode *inode;
 665         struct nfs4_state *state;
 666         struct nfs_closeargs arg;
 667         struct nfs_closeres res;
 668 };
 669
 670 static void nfs4_close_done(struct rpc_task *task)
 671 {
 672         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 673         struct nfs4_state *state = calldata->state;
 674         struct nfs4_state_owner *sp = state->owner;
 675         struct nfs_server *server = NFS_SERVER(calldata->inode);
 676
 677         /* hmm. we are done with the inode, and in the process of freeing
 678          * the state_owner. we keep this around to process errors
 679          */
 680         nfs4_increment_seqid(task->tk_status, sp);
 681         switch (task->tk_status) {
 682                 case 0:
 683                         state->state = calldata->arg.open_flags;
 684                         memcpy(&state->stateid, &calldata->res.stateid,
 685                                         sizeof(state->stateid));
 686                         break;
 687                 case -NFS4ERR_STALE_STATEID:
 688                 case -NFS4ERR_EXPIRED:
 689                         state->state = calldata->arg.open_flags;
 690                         nfs4_schedule_state_recovery(server->nfs4_state);
 691                         break;
 692                 default:
 693                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
 694                                 rpc_restart_call(task);
 695                                 return;
 696                         }
 697         }
 698         nfs4_put_open_state(state);
 699         up(&sp->so_sema);
 700         nfs4_put_state_owner(sp);
 701         up_read(&server->nfs4_state->cl_sem);
 702         kfree(calldata);
 703 }
 704
 705 static inline int nfs4_close_call(struct rpc_clnt *clnt, struct nfs4_closedata *calldata)
 706 {
 707         struct rpc_message msg = {
 708                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
 709                 .rpc_argp = &calldata->arg,
 710                 .rpc_resp = &calldata->res,
 711                 .rpc_cred = calldata->state->owner->so_cred,
 712         };
 713         if (calldata->arg.open_flags != 0)
 714                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
 715         return rpc_call_async(clnt, &msg, 0, nfs4_close_done, calldata);
 716 }
 717
 718 /*
 719  * It is possible for data to be read/written from a mem-mapped file
 720  * after the sys_close call (which hits the vfs layer as a flush).
 721  * This means that we can't safely call nfsv4 close on a file until
 722  * the inode is cleared. This in turn means that we are not good
 723  * NFSv4 citizens - we do not indicate to the server to update the file's
 724  * share state even when we are done with one of the three share
 725  * stateid's in the inode.
 726  *
 727  * NOTE: Caller must be holding the sp->so_owner semaphore!
 728  */
 729 int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
 730 {
 731         struct nfs4_closedata *calldata;
 732         int status;
 733
 734         /* Tell caller we're done */
 735         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
 736                 state->state = mode;
 737                 return 0;
 738         }
 739         calldata = (struct nfs4_closedata *)kmalloc(sizeof(*calldata), GFP_KERNEL);
 740         if (calldata == NULL)
 741                 return -ENOMEM;
 742         calldata->inode = inode;
 743         calldata->state = state;
 744         calldata->arg.fh = NFS_FH(inode);
 745         /* Serialization for the sequence id */
 746         calldata->arg.seqid = state->owner->so_seqid;
 747         calldata->arg.open_flags = mode;
 748         memcpy(&calldata->arg.stateid, &state->stateid,
 749                         sizeof(calldata->arg.stateid));
 750         status = nfs4_close_call(NFS_SERVER(inode)->client, calldata);
 751         /*
 752          * Return -EINPROGRESS on success in order to indicate to the
 753          * caller that an asynchronous RPC call has been launched, and
 754          * that it will release the semaphores on completion.
 755          */
 756         return (status == 0) ? -EINPROGRESS : status;
 757 }
 758
 759 struct inode *
 760 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 761 {
 762         struct iattr attr;
 763         struct rpc_cred *cred;
 764         struct nfs4_state *state;
 765
 766         if (nd->flags & LOOKUP_CREATE) {
 767                 attr.ia_mode = nd->intent.open.create_mode;
 768                 attr.ia_valid = ATTR_MODE;
 769                 if (!IS_POSIXACL(dir))
 770                         attr.ia_mode &= ~current->fs->umask;
 771         } else {
 772                 attr.ia_valid = 0;
 773                 BUG_ON(nd->intent.open.flags & O_CREAT);
 774         }
 775
 776         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
 777         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
 778         put_rpccred(cred);
 779         if (IS_ERR(state))
 780                 return (struct inode *)state;
 781         return state->inode;
 782 }
 783
 784 int
 785 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags)
 786 {
 787         struct rpc_cred *cred;
 788         struct nfs4_state *state;
 789         struct inode *inode;
 790
 791         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
 792         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
 793         if (IS_ERR(state))
 794                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
 795         put_rpccred(cred);
 796         if (state == ERR_PTR(-ENOENT) && dentry->d_inode == 0)
 797                 return 1;
 798         if (IS_ERR(state))
 799                 return 0;
 800         inode = state->inode;
 801         if (inode == dentry->d_inode) {
 802                 iput(inode);
 803                 return 1;
 804         }
 805         d_drop(dentry);
 806         nfs4_close_state(state, openflags);
 807         iput(inode);
 808         return 0;
 809 }
 810
 811
 812 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
 813 {
 814         struct nfs4_server_caps_res res = {};
 815         struct rpc_message msg = {
 816                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
 817                 .rpc_argp = fhandle,
 818                 .rpc_resp = &res,
 819         };
 820         int status;
 821
 822         status = rpc_call_sync(server->client, &msg, 0);
 823         if (status == 0) {
 824                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
 825                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
 826                         server->caps |= NFS_CAP_ACLS;
 827                 if (res.has_links != 0)
 828                         server->caps |= NFS_CAP_HARDLINKS;
 829                 if (res.has_symlinks != 0)
 830                         server->caps |= NFS_CAP_SYMLINKS;
 831                 server->acl_bitmask = res.acl_bitmask;
 832         }
 833         return status;
 834 }
 835
 836 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
 837 {
 838         struct nfs4_exception exception = { };
 839         int err;
 840         do {
 841                 err = nfs4_handle_exception(server,
 842                                 _nfs4_server_capabilities(server, fhandle),
 843                                 &exception);
 844         } while (exception.retry);
 845         return err;
 846 }
 847
 848 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
 849                 struct nfs_fsinfo *info)
 850 {
 851         struct nfs_fattr *      fattr = info->fattr;
 852         struct nfs4_lookup_root_arg args = {
 853                 .bitmask = nfs4_fattr_bitmap,
 854         };
 855         struct nfs4_lookup_res res = {
 856                 .server = server,
 857                 .fattr = fattr,
 858                 .fh = fhandle,
 859         };
 860         struct rpc_message msg = {
 861                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
 862                 .rpc_argp = &args,
 863                 .rpc_resp = &res,
 864         };
 865         fattr->valid = 0;
 866         return rpc_call_sync(server->client, &msg, 0);
 867 }
 868
 869 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
 870                 struct nfs_fsinfo *info)
 871 {
 872         struct nfs4_exception exception = { };
 873         int err;
 874         do {
 875                 err = nfs4_handle_exception(server,
 876                                 _nfs4_lookup_root(server, fhandle, info),
 877                                 &exception);
 878         } while (exception.retry);
 879         return err;
 880 }
 881
 882 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
 883                 struct nfs_fsinfo *info)
 884 {
 885         struct nfs_fattr *      fattr = info->fattr;
 886         unsigned char *         p;
 887         struct qstr             q;
 888         struct nfs4_lookup_arg args = {
 889                 .dir_fh = fhandle,
 890                 .name = &q,
 891                 .bitmask = nfs4_fattr_bitmap,
 892         };
 893         struct nfs4_lookup_res res = {
 894                 .server = server,
 895                 .fattr = fattr,
 896                 .fh = fhandle,
 897         };
 898         struct rpc_message msg = {
 899                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
 900                 .rpc_argp = &args,
 901                 .rpc_resp = &res,
 902         };
 903         int status;
 904
 905         /*
 906          * Now we do a separate LOOKUP for each component of the mount path.
 907          * The LOOKUPs are done separately so that we can conveniently
 908          * catch an ERR_WRONGSEC if it occurs along the way...
 909          */
 910         status = nfs4_lookup_root(server, fhandle, info);
 911         if (status)
 912                 goto out;
 913
 914         p = server->mnt_path;
 915         for (;;) {
 916                 struct nfs4_exception exception = { };
 917
 918                 while (*p == '/')
 919                         p++;
 920                 if (!*p)
 921                         break;
 922                 q.name = p;
 923                 while (*p && (*p != '/'))
 924                         p++;
 925                 q.len = p - q.name;
 926
 927                 do {
 928                         fattr->valid = 0;
 929                         status = nfs4_handle_exception(server,
 930                                         rpc_call_sync(server->client, &msg, 0),
 931                                         &exception);
 932                 } while (exception.retry);
 933                 if (status == 0)
 934                         continue;
 935                 if (status == -ENOENT) {
 936                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
 937                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
 938                 }
 939                 break;
 940         }
 941         if (status == 0)
 942                 status = nfs4_server_capabilities(server, fhandle);
 943         if (status == 0)
 944                 status = nfs4_do_fsinfo(server, fhandle, info);
 945 out:
 946         return status;
 947 }
 948
 949 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 950 {
 951         struct nfs4_getattr_arg args = {
 952                 .fh = fhandle,
 953                 .bitmask = server->attr_bitmask,
 954         };
 955         struct nfs4_getattr_res res = {
 956                 .fattr = fattr,
 957                 .server = server,
 958         };
 959         struct rpc_message msg = {
 960                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
 961                 .rpc_argp = &args,
 962                 .rpc_resp = &res,
 963         };
 964
 965         fattr->valid = 0;
 966         return rpc_call_sync(server->client, &msg, 0);
 967 }
 968
 969 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 970 {
 971         struct nfs4_exception exception = { };
 972         int err;
 973         do {
 974                 err = nfs4_handle_exception(server,
 975                                 _nfs4_proc_getattr(server, fhandle, fattr),
 976                                 &exception);
 977         } while (exception.retry);
 978         return err;
 979 }
 980
 981 /*
 982  * The file is not closed if it is opened due to the a request to change
 983  * the size of the file. The open call will not be needed once the
 984  * VFS layer lookup-intents are implemented.
 985  *
 986  * Close is called when the inode is destroyed.
 987  * If we haven't opened the file for O_WRONLY, we
 988  * need to in the size_change case to obtain a stateid.
 989  *
 990  * Got race?
 991  * Because OPEN is always done by name in nfsv4, it is
 992  * possible that we opened a different file by the same
 993  * name.  We can recognize this race condition, but we
 994  * can't do anything about it besides returning an error.
 995  *
 996  * This will be fixed with VFS changes (lookup-intent).
 997  */
 998 static int
 999 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1000                   struct iattr *sattr)
1001 {
1002         struct inode *          inode = dentry->d_inode;
1003         int                     size_change = sattr->ia_valid & ATTR_SIZE;
1004         struct nfs4_state       *state = NULL;
1005         int need_iput = 0;
1006         int status;
1007
1008         fattr->valid = 0;
1009
1010         if (size_change) {
1011                 struct rpc_cred *cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1012                 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1013                 if (state == NULL) {
1014                         state = nfs4_open_delegated(dentry->d_inode,
1015                                         FMODE_WRITE, cred);
1016                         if (IS_ERR(state))
1017                                 state = nfs4_do_open(dentry->d_parent->d_inode,
1018                                                 dentry, FMODE_WRITE,
1019                                                 NULL, cred);
1020                         need_iput = 1;
1021                 }
1022                 put_rpccred(cred);
1023                 if (IS_ERR(state))
1024                         return PTR_ERR(state);
1025
1026                 if (state->inode != inode) {
1027                         printk(KERN_WARNING "nfs: raced in setattr (%p != %p), returning -EIO\n", inode, state->inode);
1028                         status = -EIO;
1029                         goto out;
1030                 }
1031         }
1032         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1033                         NFS_FH(inode), sattr, state);
1034 out:
1035         if (state) {
1036                 inode = state->inode;
1037                 nfs4_close_state(state, FMODE_WRITE);
1038                 if (need_iput)
1039                         iput(inode);
1040         }
1041         return status;
1042 }
1043
1044 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1045                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1046 {
1047         int                    status;
1048         struct nfs_server *server = NFS_SERVER(dir);
1049         struct nfs4_lookup_arg args = {
1050                 .bitmask = server->attr_bitmask,
1051                 .dir_fh = NFS_FH(dir),
1052                 .name = name,
1053         };
1054         struct nfs4_lookup_res res = {
1055                 .server = server,
1056                 .fattr = fattr,
1057                 .fh = fhandle,
1058         };
1059         struct rpc_message msg = {
1060                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1061                 .rpc_argp = &args,
1062                 .rpc_resp = &res,
1063         };
1064
1065         fattr->valid = 0;
1066
1067         dprintk("NFS call  lookup %s\n", name->name);
1068         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1069         dprintk("NFS reply lookup: %d\n", status);
1070         return status;
1071 }
1072
1073 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1074 {
1075         struct nfs4_exception exception = { };
1076         int err;
1077         do {
1078                 err = nfs4_handle_exception(NFS_SERVER(dir),
1079                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1080                                 &exception);
1081         } while (exception.retry);
1082         return err;
1083 }
1084
1085 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1086 {
1087         struct nfs4_accessargs args = {
1088                 .fh = NFS_FH(inode),
1089         };
1090         struct nfs4_accessres res = { 0 };
1091         struct rpc_message msg = {
1092                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1093                 .rpc_argp = &args,
1094                 .rpc_resp = &res,
1095                 .rpc_cred = entry->cred,
1096         };
1097         int mode = entry->mask;
1098         int status;
1099
1100         /*
1101          * Determine which access bits we want to ask for...
1102          */
1103         if (mode & MAY_READ)
1104                 args.access |= NFS4_ACCESS_READ;
1105         if (S_ISDIR(inode->i_mode)) {
1106                 if (mode & MAY_WRITE)
1107                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1108                 if (mode & MAY_EXEC)
1109                         args.access |= NFS4_ACCESS_LOOKUP;
1110         } else {
1111                 if (mode & MAY_WRITE)
1112                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1113                 if (mode & MAY_EXEC)
1114                         args.access |= NFS4_ACCESS_EXECUTE;
1115         }
1116         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1117         if (!status) {
1118                 entry->mask = 0;
1119                 if (res.access & NFS4_ACCESS_READ)
1120                         entry->mask |= MAY_READ;
1121                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1122                         entry->mask |= MAY_WRITE;
1123                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1124                         entry->mask |= MAY_EXEC;
1125         }
1126         return status;
1127 }
1128
1129 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1130 {
1131         struct nfs4_exception exception = { };
1132         int err;
1133         do {
1134                 err = nfs4_handle_exception(NFS_SERVER(inode),
1135                                 _nfs4_proc_access(inode, entry),
1136                                 &exception);
1137         } while (exception.retry);
1138         return err;
1139 }
1140
1141 /*
1142  * TODO: For the time being, we don't try to get any attributes
1143  * along with any of the zero-copy operations READ, READDIR,
1144  * READLINK, WRITE.
1145  *
1146  * In the case of the first three, we want to put the GETATTR
1147  * after the read-type operation -- this is because it is hard
1148  * to predict the length of a GETATTR response in v4, and thus
1149  * align the READ data correctly.  This means that the GETATTR
1150  * may end up partially falling into the page cache, and we should
1151  * shift it into the 'tail' of the xdr_buf before processing.
1152  * To do this efficiently, we need to know the total length
1153  * of data received, which doesn't seem to be available outside
1154  * of the RPC layer.
1155  *
1156  * In the case of WRITE, we also want to put the GETATTR after
1157  * the operation -- in this case because we want to make sure
1158  * we get the post-operation mtime and size.  This means that
1159  * we can't use xdr_encode_pages() as written: we need a variant
1160  * of it which would leave room in the 'tail' iovec.
1161  *
1162  * Both of these changes to the XDR layer would in fact be quite
1163  * minor, but I decided to leave them for a subsequent patch.
1164  */
1165 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1166                 unsigned int pgbase, unsigned int pglen)
1167 {
1168         struct nfs4_readlink args = {
1169                 .fh       = NFS_FH(inode),
1170                 .pgbase   = pgbase,
1171                 .pglen    = pglen,
1172                 .pages    = &page,
1173         };
1174         struct rpc_message msg = {
1175                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1176                 .rpc_argp = &args,
1177                 .rpc_resp = NULL,
1178         };
1179
1180         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1181 }
1182
1183 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1184                 unsigned int pgbase, unsigned int pglen)
1185 {
1186         struct nfs4_exception exception = { };
1187         int err;
1188         do {
1189                 err = nfs4_handle_exception(NFS_SERVER(inode),
1190                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1191                                 &exception);
1192         } while (exception.retry);
1193         return err;
1194 }
1195
1196 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1197 {
1198         int flags = rdata->flags;
1199         struct inode *inode = rdata->inode;
1200         struct nfs_fattr *fattr = rdata->res.fattr;
1201         struct nfs_server *server = NFS_SERVER(inode);
1202         struct rpc_message msg = {
1203                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1204                 .rpc_argp       = &rdata->args,
1205                 .rpc_resp       = &rdata->res,
1206                 .rpc_cred       = rdata->cred,
1207         };
1208         unsigned long timestamp = jiffies;
1209         int status;
1210
1211         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1212                         (long long) rdata->args.offset);
1213
1214         fattr->valid = 0;
1215         status = rpc_call_sync(server->client, &msg, flags);
1216         if (!status)
1217                 renew_lease(server, timestamp);
1218         dprintk("NFS reply read: %d\n", status);
1219         return status;
1220 }
1221
1222 static int nfs4_proc_read(struct nfs_read_data *rdata)
1223 {
1224         struct nfs4_exception exception = { };
1225         int err;
1226         do {
1227                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1228                                 _nfs4_proc_read(rdata),
1229                                 &exception);
1230         } while (exception.retry);
1231         return err;
1232 }
1233
1234 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1235 {
1236         int rpcflags = wdata->flags;
1237         struct inode *inode = wdata->inode;
1238         struct nfs_fattr *fattr = wdata->res.fattr;
1239         struct nfs_server *server = NFS_SERVER(inode);
1240         struct rpc_message msg = {
1241                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1242                 .rpc_argp       = &wdata->args,
1243                 .rpc_resp       = &wdata->res,
1244                 .rpc_cred       = wdata->cred,
1245         };
1246         int status;
1247
1248         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1249                         (long long) wdata->args.offset);
1250
1251         fattr->valid = 0;
1252         status = rpc_call_sync(server->client, &msg, rpcflags);
1253         dprintk("NFS reply write: %d\n", status);
1254         return status;
1255 }
1256
1257 static int nfs4_proc_write(struct nfs_write_data *wdata)
1258 {
1259         struct nfs4_exception exception = { };
1260         int err;
1261         do {
1262                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1263                                 _nfs4_proc_write(wdata),
1264                                 &exception);
1265         } while (exception.retry);
1266         return err;
1267 }
1268
1269 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1270 {
1271         struct inode *inode = cdata->inode;
1272         struct nfs_fattr *fattr = cdata->res.fattr;
1273         struct nfs_server *server = NFS_SERVER(inode);
1274         struct rpc_message msg = {
1275                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1276                 .rpc_argp       = &cdata->args,
1277                 .rpc_resp       = &cdata->res,
1278                 .rpc_cred       = cdata->cred,
1279         };
1280         int status;
1281
1282         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1283                         (long long) cdata->args.offset);
1284
1285         fattr->valid = 0;
1286         status = rpc_call_sync(server->client, &msg, 0);
1287         dprintk("NFS reply commit: %d\n", status);
1288         return status;
1289 }
1290
1291 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1292 {
1293         struct nfs4_exception exception = { };
1294         int err;
1295         do {
1296                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1297                                 _nfs4_proc_commit(cdata),
1298                                 &exception);
1299         } while (exception.retry);
1300         return err;
1301 }
1302
1303 /*
1304  * Got race?
1305  * We will need to arrange for the VFS layer to provide an atomic open.
1306  * Until then, this create/open method is prone to inefficiency and race
1307  * conditions due to the lookup, create, and open VFS calls from sys_open()
1308  * placed on the wire.
1309  *
1310  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1311  * The file will be opened again in the subsequent VFS open call
1312  * (nfs4_proc_file_open).
1313  *
1314  * The open for read will just hang around to be used by any process that
1315  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1316  */
1317
1318 static struct inode *
1319 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1320                  int flags)
1321 {
1322         struct inode *inode;
1323         struct nfs4_state *state = NULL;
1324         struct rpc_cred *cred;
1325
1326         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1327         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1328         put_rpccred(cred);
1329         if (!IS_ERR(state)) {
1330                 inode = state->inode;
1331                 if (flags & O_EXCL) {
1332                         struct nfs_fattr fattr;
1333                         int status;
1334                         status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1335                                              NFS_FH(inode), sattr, state);
1336                         if (status != 0) {
1337                                 nfs4_close_state(state, flags);
1338                                 iput(inode);
1339                                 inode = ERR_PTR(status);
1340                         }
1341                 }
1342         } else
1343                 inode = (struct inode *)state;
1344         return inode;
1345 }
1346
1347 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1348 {
1349         struct nfs4_remove_arg args = {
1350                 .fh = NFS_FH(dir),
1351                 .name = name,
1352         };
1353         struct nfs4_change_info res;
1354         struct rpc_message msg = {
1355                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1356                 .rpc_argp       = &args,
1357                 .rpc_resp       = &res,
1358         };
1359         int                     status;
1360
1361         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1362         if (status == 0)
1363                 update_changeattr(dir, &res);
1364         return status;
1365 }
1366
1367 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1368 {
1369         struct nfs4_exception exception = { };
1370         int err;
1371         do {
1372                 err = nfs4_handle_exception(NFS_SERVER(dir),
1373                                 _nfs4_proc_remove(dir, name),
1374                                 &exception);
1375         } while (exception.retry);
1376         return err;
1377 }
1378
1379 struct unlink_desc {
1380         struct nfs4_remove_arg  args;
1381         struct nfs4_change_info res;
1382 };
1383
1384 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1385                 struct qstr *name)
1386 {
1387         struct unlink_desc *up;
1388
1389         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1390         if (!up)
1391                 return -ENOMEM;
1392
1393         up->args.fh = NFS_FH(dir->d_inode);
1394         up->args.name = name;
1395
1396         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1397         msg->rpc_argp = &up->args;
1398         msg->rpc_resp = &up->res;
1399         return 0;
1400 }
1401
1402 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1403 {
1404         struct rpc_message *msg = &task->tk_msg;
1405         struct unlink_desc *up;
1406
1407         if (msg->rpc_resp != NULL) {
1408                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1409                 update_changeattr(dir->d_inode, &up->res);
1410                 kfree(up);
1411                 msg->rpc_resp = NULL;
1412                 msg->rpc_argp = NULL;
1413         }
1414         return 0;
1415 }
1416
1417 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1418                 struct inode *new_dir, struct qstr *new_name)
1419 {
1420         struct nfs4_rename_arg arg = {
1421                 .old_dir = NFS_FH(old_dir),
1422                 .new_dir = NFS_FH(new_dir),
1423                 .old_name = old_name,
1424                 .new_name = new_name,
1425         };
1426         struct nfs4_rename_res res = { };
1427         struct rpc_message msg = {
1428                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1429                 .rpc_argp = &arg,
1430                 .rpc_resp = &res,
1431         };
1432         int                     status;
1433
1434         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
1435
1436         if (!status) {
1437                 update_changeattr(old_dir, &res.old_cinfo);
1438                 update_changeattr(new_dir, &res.new_cinfo);
1439         }
1440         return status;
1441 }
1442
1443 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1444                 struct inode *new_dir, struct qstr *new_name)
1445 {
1446         struct nfs4_exception exception = { };
1447         int err;
1448         do {
1449                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1450                                 _nfs4_proc_rename(old_dir, old_name,
1451                                         new_dir, new_name),
1452                                 &exception);
1453         } while (exception.retry);
1454         return err;
1455 }
1456
1457 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1458 {
1459         struct nfs4_link_arg arg = {
1460                 .fh     = NFS_FH(inode),
1461                 .dir_fh = NFS_FH(dir),
1462                 .name   = name,
1463         };
1464         struct nfs4_change_info cinfo = { };
1465         struct rpc_message msg = {
1466                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1467                 .rpc_argp = &arg,
1468                 .rpc_resp = &cinfo,
1469         };
1470         int                     status;
1471
1472         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1473         if (!status)
1474                 update_changeattr(dir, &cinfo);
1475
1476         return status;
1477 }
1478
1479 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1480 {
1481         struct nfs4_exception exception = { };
1482         int err;
1483         do {
1484                 err = nfs4_handle_exception(NFS_SERVER(inode),
1485                                 _nfs4_proc_link(inode, dir, name),
1486                                 &exception);
1487         } while (exception.retry);
1488         return err;
1489 }
1490
1491 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1492                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1493                 struct nfs_fattr *fattr)
1494 {
1495         struct nfs_server *server = NFS_SERVER(dir);
1496         struct nfs4_create_arg arg = {
1497                 .dir_fh = NFS_FH(dir),
1498                 .server = server,
1499                 .name = name,
1500                 .attrs = sattr,
1501                 .ftype = NF4LNK,
1502                 .bitmask = server->attr_bitmask,
1503         };
1504         struct nfs4_create_res res = {
1505                 .server = server,
1506                 .fh = fhandle,
1507                 .fattr = fattr,
1508         };
1509         struct rpc_message msg = {
1510                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1511                 .rpc_argp = &arg,
1512                 .rpc_resp = &res,
1513         };
1514         int                     status;
1515
1516         if (path->len > NFS4_MAXPATHLEN)
1517                 return -ENAMETOOLONG;
1518         arg.u.symlink = path;
1519         fattr->valid = 0;
1520
1521         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1522         if (!status)
1523                 update_changeattr(dir, &res.dir_cinfo);
1524         return status;
1525 }
1526
1527 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1528                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1529                 struct nfs_fattr *fattr)
1530 {
1531         struct nfs4_exception exception = { };
1532         int err;
1533         do {
1534                 err = nfs4_handle_exception(NFS_SERVER(dir),
1535                                 _nfs4_proc_symlink(dir, name, path, sattr,
1536                                         fhandle, fattr),
1537                                 &exception);
1538         } while (exception.retry);
1539         return err;
1540 }
1541
1542 static int _nfs4_proc_mkdir(struct inode *dir, struct qstr *name,
1543                 struct iattr *sattr, struct nfs_fh *fhandle,
1544                 struct nfs_fattr *fattr)
1545 {
1546         struct nfs_server *server = NFS_SERVER(dir);
1547         struct nfs4_create_arg arg = {
1548                 .dir_fh = NFS_FH(dir),
1549                 .server = server,
1550                 .name = name,
1551                 .attrs = sattr,
1552                 .ftype = NF4DIR,
1553                 .bitmask = server->attr_bitmask,
1554         };
1555         struct nfs4_create_res res = {
1556                 .server = server,
1557                 .fh = fhandle,
1558                 .fattr = fattr,
1559         };
1560         struct rpc_message msg = {
1561                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1562                 .rpc_argp = &arg,
1563                 .rpc_resp = &res,
1564         };
1565         int                     status;
1566
1567         fattr->valid = 0;
1568
1569         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1570         if (!status)
1571                 update_changeattr(dir, &res.dir_cinfo);
1572         return status;
1573 }
1574
1575 static int nfs4_proc_mkdir(struct inode *dir, struct qstr *name,
1576                 struct iattr *sattr, struct nfs_fh *fhandle,
1577                 struct nfs_fattr *fattr)
1578 {
1579         struct nfs4_exception exception = { };
1580         int err;
1581         do {
1582                 err = nfs4_handle_exception(NFS_SERVER(dir),
1583                                 _nfs4_proc_mkdir(dir, name, sattr,
1584                                         fhandle, fattr),
1585                                 &exception);
1586         } while (exception.retry);
1587         return err;
1588 }
1589
1590 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1591                   u64 cookie, struct page *page, unsigned int count, int plus)
1592 {
1593         struct inode            *dir = dentry->d_inode;
1594         struct nfs4_readdir_arg args = {
1595                 .fh = NFS_FH(dir),
1596                 .pages = &page,
1597                 .pgbase = 0,
1598                 .count = count,
1599         };
1600         struct nfs4_readdir_res res;
1601         struct rpc_message msg = {
1602                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1603                 .rpc_argp = &args,
1604                 .rpc_resp = &res,
1605                 .rpc_cred = cred,
1606         };
1607         int                     status;
1608
1609         lock_kernel();
1610         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1611         res.pgbase = args.pgbase;
1612         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1613         if (status == 0)
1614                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1615         unlock_kernel();
1616         return status;
1617 }
1618
1619 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1620                   u64 cookie, struct page *page, unsigned int count, int plus)
1621 {
1622         struct nfs4_exception exception = { };
1623         int err;
1624         do {
1625                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1626                                 _nfs4_proc_readdir(dentry, cred, cookie,
1627                                         page, count, plus),
1628                                 &exception);
1629         } while (exception.retry);
1630         return err;
1631 }
1632
1633 static int _nfs4_proc_mknod(struct inode *dir, struct qstr *name,
1634                 struct iattr *sattr, dev_t rdev, struct nfs_fh *fh,
1635                 struct nfs_fattr *fattr)
1636 {
1637         struct nfs_server *server = NFS_SERVER(dir);
1638         struct nfs4_create_arg arg = {
1639                 .dir_fh = NFS_FH(dir),
1640                 .server = server,
1641                 .name = name,
1642                 .attrs = sattr,
1643                 .bitmask = server->attr_bitmask,
1644         };
1645         struct nfs4_create_res res = {
1646                 .server = server,
1647                 .fh = fh,
1648                 .fattr = fattr,
1649         };
1650         struct rpc_message msg = {
1651                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1652                 .rpc_argp = &arg,
1653                 .rpc_resp = &res,
1654         };
1655         int                     status;
1656         int                     mode = sattr->ia_mode;
1657
1658         fattr->valid = 0;
1659
1660         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1661         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1662         if (S_ISFIFO(mode))
1663                 arg.ftype = NF4FIFO;
1664         else if (S_ISBLK(mode)) {
1665                 arg.ftype = NF4BLK;
1666                 arg.u.device.specdata1 = MAJOR(rdev);
1667                 arg.u.device.specdata2 = MINOR(rdev);
1668         }
1669         else if (S_ISCHR(mode)) {
1670                 arg.ftype = NF4CHR;
1671                 arg.u.device.specdata1 = MAJOR(rdev);
1672                 arg.u.device.specdata2 = MINOR(rdev);
1673         }
1674         else
1675                 arg.ftype = NF4SOCK;
1676
1677         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1678         if (!status)
1679                 update_changeattr(dir, &res.dir_cinfo);
1680         return status;
1681 }
1682
1683 static int nfs4_proc_mknod(struct inode *dir, struct qstr *name,
1684                 struct iattr *sattr, dev_t rdev, struct nfs_fh *fh,
1685                 struct nfs_fattr *fattr)
1686 {
1687         struct nfs4_exception exception = { };
1688         int err;
1689         do {
1690                 err = nfs4_handle_exception(NFS_SERVER(dir),
1691                                 _nfs4_proc_mknod(dir, name, sattr, rdev,
1692                                         fh, fattr),
1693                                 &exception);
1694         } while (exception.retry);
1695         return err;
1696 }
1697
1698 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
1699                  struct nfs_fsstat *fsstat)
1700 {
1701         struct nfs4_statfs_arg args = {
1702                 .fh = fhandle,
1703                 .bitmask = server->attr_bitmask,
1704         };
1705         struct rpc_message msg = {
1706                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
1707                 .rpc_argp = &args,
1708                 .rpc_resp = fsstat,
1709         };
1710
1711         fsstat->fattr->valid = 0;
1712         return rpc_call_sync(server->client, &msg, 0);
1713 }
1714
1715 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
1716 {
1717         struct nfs4_exception exception = { };
1718         int err;
1719         do {
1720                 err = nfs4_handle_exception(server,
1721                                 _nfs4_proc_statfs(server, fhandle, fsstat),
1722                                 &exception);
1723         } while (exception.retry);
1724         return err;
1725 }
1726
1727 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
1728                 struct nfs_fsinfo *fsinfo)
1729 {
1730         struct nfs4_fsinfo_arg args = {
1731                 .fh = fhandle,
1732                 .bitmask = server->attr_bitmask,
1733         };
1734         struct rpc_message msg = {
1735                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
1736                 .rpc_argp = &args,
1737                 .rpc_resp = fsinfo,
1738         };
1739
1740         return rpc_call_sync(server->client, &msg, 0);
1741 }
1742
1743 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
1744 {
1745         struct nfs4_exception exception = { };
1746         int err;
1747
1748         do {
1749                 err = nfs4_handle_exception(server,
1750                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
1751                                 &exception);
1752         } while (exception.retry);
1753         return err;
1754 }
1755
1756 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
1757 {
1758         fsinfo->fattr->valid = 0;
1759         return nfs4_do_fsinfo(server, fhandle, fsinfo);
1760 }
1761
1762 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
1763                 struct nfs_pathconf *pathconf)
1764 {
1765         struct nfs4_pathconf_arg args = {
1766                 .fh = fhandle,
1767                 .bitmask = server->attr_bitmask,
1768         };
1769         struct rpc_message msg = {
1770                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
1771                 .rpc_argp = &args,
1772                 .rpc_resp = pathconf,
1773         };
1774
1775         /* None of the pathconf attributes are mandatory to implement */
1776         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
1777                 memset(pathconf, 0, sizeof(*pathconf));
1778                 return 0;
1779         }
1780
1781         pathconf->fattr->valid = 0;
1782         return rpc_call_sync(server->client, &msg, 0);
1783 }
1784
1785 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
1786                 struct nfs_pathconf *pathconf)
1787 {
1788         struct nfs4_exception exception = { };
1789         int err;
1790
1791         do {
1792                 err = nfs4_handle_exception(server,
1793                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
1794                                 &exception);
1795         } while (exception.retry);
1796         return err;
1797 }
1798
1799 static void
1800 nfs4_read_done(struct rpc_task *task)
1801 {
1802         struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
1803         struct inode *inode = data->inode;
1804
1805         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
1806                 rpc_restart_call(task);
1807                 return;
1808         }
1809         if (task->tk_status > 0)
1810                 renew_lease(NFS_SERVER(inode), data->timestamp);
1811         /* Call back common NFS readpage processing */
1812         nfs_readpage_result(task);
1813 }
1814
1815 static void
1816 nfs4_proc_read_setup(struct nfs_read_data *data)
1817 {
1818         struct rpc_task *task = &data->task;
1819         struct rpc_message msg = {
1820                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
1821                 .rpc_argp = &data->args,
1822                 .rpc_resp = &data->res,
1823                 .rpc_cred = data->cred,
1824         };
1825         struct inode *inode = data->inode;
1826         int flags;
1827
1828         data->timestamp   = jiffies;
1829
1830         /* N.B. Do we need to test? Never called for swapfile inode */
1831         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
1832
1833         /* Finalize the task. */
1834         rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
1835         rpc_call_setup(task, &msg, 0);
1836 }
1837
1838 static void
1839 nfs4_write_done(struct rpc_task *task)
1840 {
1841         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
1842         struct inode *inode = data->inode;
1843
1844         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
1845                 rpc_restart_call(task);
1846                 return;
1847         }
1848         if (task->tk_status >= 0)
1849                 renew_lease(NFS_SERVER(inode), data->timestamp);
1850         /* Call back common NFS writeback processing */
1851         nfs_writeback_done(task);
1852 }
1853
1854 static void
1855 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1856 {
1857         struct rpc_task *task = &data->task;
1858         struct rpc_message msg = {
1859                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1860                 .rpc_argp = &data->args,
1861                 .rpc_resp = &data->res,
1862                 .rpc_cred = data->cred,
1863         };
1864         struct inode *inode = data->inode;
1865         int stable;
1866         int flags;
1867
1868         if (how & FLUSH_STABLE) {
1869                 if (!NFS_I(inode)->ncommit)
1870                         stable = NFS_FILE_SYNC;
1871                 else
1872                         stable = NFS_DATA_SYNC;
1873         } else
1874                 stable = NFS_UNSTABLE;
1875         data->args.stable = stable;
1876
1877         data->timestamp   = jiffies;
1878
1879         /* Set the initial flags for the task.  */
1880         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
1881
1882         /* Finalize the task. */
1883         rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
1884         rpc_call_setup(task, &msg, 0);
1885 }
1886
1887 static void
1888 nfs4_commit_done(struct rpc_task *task)
1889 {
1890         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
1891         struct inode *inode = data->inode;
1892
1893         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
1894                 rpc_restart_call(task);
1895                 return;
1896         }
1897         /* Call back common NFS writeback processing */
1898         nfs_commit_done(task);
1899 }
1900
1901 static void
1902 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1903 {
1904         struct rpc_task *task = &data->task;
1905         struct rpc_message msg = {
1906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1907                 .rpc_argp = &data->args,
1908                 .rpc_resp = &data->res,
1909                 .rpc_cred = data->cred,
1910         };
1911         struct inode *inode = data->inode;
1912         int flags;
1913
1914         /* Set the initial flags for the task.  */
1915         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
1916
1917         /* Finalize the task. */
1918         rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
1919         rpc_call_setup(task, &msg, 0);
1920 }
1921
1922 /*
1923  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
1924  * standalone procedure for queueing an asynchronous RENEW.
1925  */
1926 static void
1927 renew_done(struct rpc_task *task)
1928 {
1929         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
1930         unsigned long timestamp = (unsigned long)task->tk_calldata;
1931
1932         if (task->tk_status < 0) {
1933                 switch (task->tk_status) {
1934                         case -NFS4ERR_STALE_CLIENTID:
1935                         case -NFS4ERR_EXPIRED:
1936                         case -NFS4ERR_CB_PATH_DOWN:
1937                                 nfs4_schedule_state_recovery(clp);
1938                 }
1939                 return;
1940         }
1941         spin_lock(&clp->cl_lock);
1942         if (time_before(clp->cl_last_renewal,timestamp))
1943                 clp->cl_last_renewal = timestamp;
1944         spin_unlock(&clp->cl_lock);
1945 }
1946
1947 int
1948 nfs4_proc_async_renew(struct nfs4_client *clp)
1949 {
1950         struct rpc_message msg = {
1951                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
1952                 .rpc_argp       = clp,
1953                 .rpc_cred       = clp->cl_cred,
1954         };
1955
1956         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
1957                         renew_done, (void *)jiffies);
1958 }
1959
1960 int
1961 nfs4_proc_renew(struct nfs4_client *clp)
1962 {
1963         struct rpc_message msg = {
1964                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
1965                 .rpc_argp       = clp,
1966                 .rpc_cred       = clp->cl_cred,
1967         };
1968         unsigned long now = jiffies;
1969         int status;
1970
1971         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
1972         if (status < 0)
1973                 return status;
1974         spin_lock(&clp->cl_lock);
1975         if (time_before(clp->cl_last_renewal,now))
1976                 clp->cl_last_renewal = now;
1977         spin_unlock(&clp->cl_lock);
1978         return 0;
1979 }
1980
1981 /*
1982  * We will need to arrange for the VFS layer to provide an atomic open.
1983  * Until then, this open method is prone to inefficiency and race conditions
1984  * due to the lookup, potential create, and open VFS calls from sys_open()
1985  * placed on the wire.
1986  */
1987 static int
1988 nfs4_proc_file_open(struct inode *inode, struct file *filp)
1989 {
1990         struct dentry *dentry = filp->f_dentry;
1991         struct nfs_open_context *ctx;
1992         struct nfs4_state *state = NULL;
1993         struct rpc_cred *cred;
1994         int status = -ENOMEM;
1995
1996         dprintk("nfs4_proc_file_open: starting on (%.*s/%.*s)\n",
1997                                (int)dentry->d_parent->d_name.len,
1998                                dentry->d_parent->d_name.name,
1999                                (int)dentry->d_name.len, dentry->d_name.name);
2000
2001
2002         /* Find our open stateid */
2003         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
2004         if (unlikely(cred == NULL))
2005                 return -ENOMEM;
2006         ctx = alloc_nfs_open_context(dentry, cred);
2007         put_rpccred(cred);
2008         if (unlikely(ctx == NULL))
2009                 return -ENOMEM;
2010         status = -EIO; /* ERACE actually */
2011         state = nfs4_find_state(inode, cred, filp->f_mode);
2012         if (unlikely(state == NULL))
2013                 goto no_state;
2014         ctx->state = state;
2015         nfs4_close_state(state, filp->f_mode);
2016         ctx->mode = filp->f_mode;
2017         nfs_file_set_open_context(filp, ctx);
2018         put_nfs_open_context(ctx);
2019         if (filp->f_mode & FMODE_WRITE)
2020                 nfs_begin_data_update(inode);
2021         return 0;
2022 no_state:
2023         printk(KERN_WARNING "NFS: v4 raced in function %s\n", __FUNCTION__);
2024         put_nfs_open_context(ctx);
2025         return status;
2026 }
2027
2028 /*
2029  * Release our state
2030  */
2031 static int
2032 nfs4_proc_file_release(struct inode *inode, struct file *filp)
2033 {
2034         if (filp->f_mode & FMODE_WRITE)
2035                 nfs_end_data_update(inode);
2036         nfs_file_clear_open_context(filp);
2037         return 0;
2038 }
2039
2040 static int
2041 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server)
2042 {
2043         struct nfs4_client *clp = server->nfs4_state;
2044
2045         if (!clp || task->tk_status >= 0)
2046                 return 0;
2047         switch(task->tk_status) {
2048                 case -NFS4ERR_STALE_CLIENTID:
2049                 case -NFS4ERR_STALE_STATEID:
2050                 case -NFS4ERR_EXPIRED:
2051                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2052                         nfs4_schedule_state_recovery(clp);
2053                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2054                                 rpc_wake_up_task(task);
2055                         task->tk_status = 0;
2056                         return -EAGAIN;
2057                 case -NFS4ERR_GRACE:
2058                 case -NFS4ERR_DELAY:
2059                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2060                         task->tk_status = 0;
2061                         return -EAGAIN;
2062                 case -NFS4ERR_OLD_STATEID:
2063                         task->tk_status = 0;
2064                         return -EAGAIN;
2065         }
2066         task->tk_status = nfs4_map_errors(task->tk_status);
2067         return 0;
2068 }
2069
2070 int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2071 {
2072         DEFINE_WAIT(wait);
2073         sigset_t oldset;
2074         int interruptible, res = 0;
2075
2076         might_sleep();
2077
2078         rpc_clnt_sigmask(clnt, &oldset);
2079         interruptible = TASK_UNINTERRUPTIBLE;
2080         if (clnt->cl_intr)
2081                 interruptible = TASK_INTERRUPTIBLE;
2082         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2083         nfs4_schedule_state_recovery(clp);
2084         if (clnt->cl_intr && signalled())
2085                 res = -ERESTARTSYS;
2086         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2087                 schedule();
2088         finish_wait(&clp->cl_waitq, &wait);
2089         rpc_clnt_sigunmask(clnt, &oldset);
2090         return res;
2091 }
2092
2093 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2094 {
2095         sigset_t oldset;
2096         int res = 0;
2097
2098         might_sleep();
2099
2100         if (*timeout <= 0)
2101                 *timeout = NFS4_POLL_RETRY_MIN;
2102         if (*timeout > NFS4_POLL_RETRY_MAX)
2103                 *timeout = NFS4_POLL_RETRY_MAX;
2104         rpc_clnt_sigmask(clnt, &oldset);
2105         if (clnt->cl_intr) {
2106                 set_current_state(TASK_INTERRUPTIBLE);
2107                 schedule_timeout(*timeout);
2108                 if (signalled())
2109                         res = -ERESTARTSYS;
2110         } else {
2111                 set_current_state(TASK_UNINTERRUPTIBLE);
2112                 schedule_timeout(*timeout);
2113         }
2114         rpc_clnt_sigunmask(clnt, &oldset);
2115         *timeout <<= 1;
2116         return res;
2117 }
2118
2119 /* This is the error handling routine for processes that are allowed
2120  * to sleep.
2121  */
2122 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2123 {
2124         struct nfs4_client *clp = server->nfs4_state;
2125         int ret = errorcode;
2126
2127         exception->retry = 0;
2128         switch(errorcode) {
2129                 case 0:
2130                         return 0;
2131                 case -NFS4ERR_STALE_CLIENTID:
2132                 case -NFS4ERR_STALE_STATEID:
2133                 case -NFS4ERR_EXPIRED:
2134                         ret = nfs4_wait_clnt_recover(server->client, clp);
2135                         if (ret == 0)
2136                                 exception->retry = 1;
2137                         break;
2138                 case -NFS4ERR_GRACE:
2139                 case -NFS4ERR_DELAY:
2140                         ret = nfs4_delay(server->client, &exception->timeout);
2141                         if (ret == 0)
2142                                 exception->retry = 1;
2143                         break;
2144                 case -NFS4ERR_OLD_STATEID:
2145                         if (ret == 0)
2146                                 exception->retry = 1;
2147         }
2148         /* We failed to handle the error */
2149         return nfs4_map_errors(ret);
2150 }
2151
2152 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2153 {
2154         static nfs4_verifier sc_verifier;
2155         static int initialized;
2156
2157         struct nfs4_setclientid setclientid = {
2158                 .sc_verifier = &sc_verifier,
2159                 .sc_prog = program,
2160         };
2161         struct rpc_message msg = {
2162                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2163                 .rpc_argp = &setclientid,
2164                 .rpc_resp = clp,
2165                 .rpc_cred = clp->cl_cred,
2166         };
2167
2168         if (!initialized) {
2169                 struct timespec boot_time;
2170                 u32 *p;
2171
2172                 initialized = 1;
2173                 boot_time = CURRENT_TIME;
2174                 p = (u32*)sc_verifier.data;
2175                 *p++ = htonl((u32)boot_time.tv_sec);
2176                 *p = htonl((u32)boot_time.tv_nsec);
2177         }
2178         setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2179                         sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u",
2180                         clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr));
2181         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2182                         sizeof(setclientid.sc_netid), "tcp");
2183         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2184                         sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2185                         clp->cl_ipaddr, port >> 8, port & 255);
2186
2187         return rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2188 }
2189
2190 int
2191 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2192 {
2193         struct nfs_fsinfo fsinfo;
2194         struct rpc_message msg = {
2195                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2196                 .rpc_argp = clp,
2197                 .rpc_resp = &fsinfo,
2198                 .rpc_cred = clp->cl_cred,
2199         };
2200         unsigned long now;
2201         int status;
2202
2203         now = jiffies;
2204         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2205         if (status == 0) {
2206                 spin_lock(&clp->cl_lock);
2207                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2208                 clp->cl_last_renewal = now;
2209                 spin_unlock(&clp->cl_lock);
2210         }
2211         return status;
2212 }
2213
2214 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2215 {
2216         struct nfs4_delegreturnargs args = {
2217                 .fhandle = NFS_FH(inode),
2218                 .stateid = stateid,
2219         };
2220         struct rpc_message msg = {
2221                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2222                 .rpc_argp = &args,
2223                 .rpc_cred = cred,
2224         };
2225
2226         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2227 }
2228
2229 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2230 {
2231         struct nfs_server *server = NFS_SERVER(inode);
2232         struct nfs4_exception exception = { };
2233         int err;
2234         do {
2235                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2236                 switch (err) {
2237                         case -NFS4ERR_STALE_STATEID:
2238                         case -NFS4ERR_EXPIRED:
2239                                 nfs4_schedule_state_recovery(server->nfs4_state);
2240                         case 0:
2241                                 return 0;
2242                 }
2243                 err = nfs4_handle_exception(server, err, &exception);
2244         } while (exception.retry);
2245         return err;
2246 }
2247
2248 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2249 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2250
2251 /*
2252  * sleep, with exponential backoff, and retry the LOCK operation.
2253  */
2254 static unsigned long
2255 nfs4_set_lock_task_retry(unsigned long timeout)
2256 {
2257         current->state = TASK_INTERRUPTIBLE;
2258         schedule_timeout(timeout);
2259         timeout <<= 1;
2260         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2261                 return NFS4_LOCK_MAXTIMEOUT;
2262         return timeout;
2263 }
2264
2265 static inline int
2266 nfs4_lck_type(int cmd, struct file_lock *request)
2267 {
2268         /* set lock type */
2269         switch (request->fl_type) {
2270                 case F_RDLCK:
2271                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2272                 case F_WRLCK:
2273                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2274                 case F_UNLCK:
2275                         return NFS4_WRITE_LT;
2276         }
2277         BUG();
2278         return 0;
2279 }
2280
2281 static inline uint64_t
2282 nfs4_lck_length(struct file_lock *request)
2283 {
2284         if (request->fl_end == OFFSET_MAX)
2285                 return ~(uint64_t)0;
2286         return request->fl_end - request->fl_start + 1;
2287 }
2288
2289 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2290 {
2291         struct inode *inode = state->inode;
2292         struct nfs_server *server = NFS_SERVER(inode);
2293         struct nfs4_client *clp = server->nfs4_state;
2294         struct nfs_lockargs arg = {
2295                 .fh = NFS_FH(inode),
2296                 .type = nfs4_lck_type(cmd, request),
2297                 .offset = request->fl_start,
2298                 .length = nfs4_lck_length(request),
2299         };
2300         struct nfs_lockres res = {
2301                 .server = server,
2302         };
2303         struct rpc_message msg = {
2304                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2305                 .rpc_argp       = &arg,
2306                 .rpc_resp       = &res,
2307                 .rpc_cred       = state->owner->so_cred,
2308         };
2309         struct nfs_lowner nlo;
2310         struct nfs4_lock_state *lsp;
2311         int status;
2312
2313         down_read(&clp->cl_sem);
2314         nlo.clientid = clp->cl_clientid;
2315         down(&state->lock_sema);
2316         lsp = nfs4_find_lock_state(state, request->fl_owner);
2317         if (lsp)
2318                 nlo.id = lsp->ls_id;
2319         else {
2320                 spin_lock(&clp->cl_lock);
2321                 nlo.id = nfs4_alloc_lockowner_id(clp);
2322                 spin_unlock(&clp->cl_lock);
2323         }
2324         arg.u.lockt = &nlo;
2325         status = rpc_call_sync(server->client, &msg, 0);
2326         if (!status) {
2327                 request->fl_type = F_UNLCK;
2328         } else if (status == -NFS4ERR_DENIED) {
2329                 int64_t len, start, end;
2330                 start = res.u.denied.offset;
2331                 len = res.u.denied.length;
2332                 end = start + len - 1;
2333                 if (end < 0 || len == 0)
2334                         request->fl_end = OFFSET_MAX;
2335                 else
2336                         request->fl_end = (loff_t)end;
2337                 request->fl_start = (loff_t)start;
2338                 request->fl_type = F_WRLCK;
2339                 if (res.u.denied.type & 1)
2340                         request->fl_type = F_RDLCK;
2341                 request->fl_pid = 0;
2342                 status = 0;
2343         }
2344         if (lsp)
2345                 nfs4_put_lock_state(lsp);
2346         up(&state->lock_sema);
2347         up_read(&clp->cl_sem);
2348         return status;
2349 }
2350
2351 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2352 {
2353         struct nfs4_exception exception = { };
2354         int err;
2355
2356         do {
2357                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2358                                 _nfs4_proc_getlk(state, cmd, request),
2359                                 &exception);
2360         } while (exception.retry);
2361         return err;
2362 }
2363
2364 static int _nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2365 {
2366         struct inode *inode = state->inode;
2367         struct nfs_server *server = NFS_SERVER(inode);
2368         struct nfs4_client *clp = server->nfs4_state;
2369         struct nfs_lockargs arg = {
2370                 .fh = NFS_FH(inode),
2371                 .type = nfs4_lck_type(cmd, request),
2372                 .offset = request->fl_start,
2373                 .length = nfs4_lck_length(request),
2374         };
2375         struct nfs_lockres res = {
2376                 .server = server,
2377         };
2378         struct rpc_message msg = {
2379                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2380                 .rpc_argp       = &arg,
2381                 .rpc_resp       = &res,
2382                 .rpc_cred       = state->owner->so_cred,
2383         };
2384         struct nfs4_lock_state *lsp;
2385         struct nfs_locku_opargs luargs;
2386         int status = 0;
2387
2388         down_read(&clp->cl_sem);
2389         down(&state->lock_sema);
2390         lsp = nfs4_find_lock_state(state, request->fl_owner);
2391         if (!lsp)
2392                 goto out;
2393         /* We might have lost the locks! */
2394         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
2395                 luargs.seqid = lsp->ls_seqid;
2396                 memcpy(&luargs.stateid, &lsp->ls_stateid, sizeof(luargs.stateid));
2397                 arg.u.locku = &luargs;
2398                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2399                 nfs4_increment_lock_seqid(status, lsp);
2400         }
2401
2402         if (status == 0) {
2403                 memcpy(&lsp->ls_stateid,  &res.u.stateid,
2404                                 sizeof(lsp->ls_stateid));
2405                 nfs4_notify_unlck(state, request, lsp);
2406         }
2407         nfs4_put_lock_state(lsp);
2408 out:
2409         up(&state->lock_sema);
2410         if (status == 0)
2411                 posix_lock_file(request->fl_file, request);
2412         up_read(&clp->cl_sem);
2413         return status;
2414 }
2415
2416 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2417 {
2418         struct nfs4_exception exception = { };
2419         int err;
2420
2421         do {
2422                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2423                                 _nfs4_proc_unlck(state, cmd, request),
2424                                 &exception);
2425         } while (exception.retry);
2426         return err;
2427 }
2428
2429 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2430 {
2431         struct inode *inode = state->inode;
2432         struct nfs_server *server = NFS_SERVER(inode);
2433         struct nfs4_lock_state *lsp;
2434         struct nfs_lockargs arg = {
2435                 .fh = NFS_FH(inode),
2436                 .type = nfs4_lck_type(cmd, request),
2437                 .offset = request->fl_start,
2438                 .length = nfs4_lck_length(request),
2439         };
2440         struct nfs_lockres res = {
2441                 .server = server,
2442         };
2443         struct rpc_message msg = {
2444                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2445                 .rpc_argp       = &arg,
2446                 .rpc_resp       = &res,
2447                 .rpc_cred       = state->owner->so_cred,
2448         };
2449         struct nfs_lock_opargs largs = {
2450                 .reclaim = reclaim,
2451                 .new_lock_owner = 0,
2452         };
2453         int status;
2454
2455         lsp = nfs4_get_lock_state(state, request->fl_owner);
2456         if (lsp == NULL)
2457                 return -ENOMEM;
2458         if (!(lsp->ls_flags & NFS_LOCK_INITIALIZED)) {
2459                 struct nfs4_state_owner *owner = state->owner;
2460                 struct nfs_open_to_lock otl = {
2461                         .lock_owner = {
2462                                 .clientid = server->nfs4_state->cl_clientid,
2463                         },
2464                 };
2465
2466                 otl.lock_seqid = lsp->ls_seqid;
2467                 otl.lock_owner.id = lsp->ls_id;
2468                 memcpy(&otl.open_stateid, &state->stateid, sizeof(otl.open_stateid));
2469                 largs.u.open_lock = &otl;
2470                 largs.new_lock_owner = 1;
2471                 arg.u.lock = &largs;
2472                 down(&owner->so_sema);
2473                 otl.open_seqid = owner->so_seqid;
2474                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2475                 /* increment open_owner seqid on success, and
2476                 * seqid mutating errors */
2477                 nfs4_increment_seqid(status, owner);
2478                 up(&owner->so_sema);
2479         } else {
2480                 struct nfs_exist_lock el = {
2481                         .seqid = lsp->ls_seqid,
2482                 };
2483                 memcpy(&el.stateid, &lsp->ls_stateid, sizeof(el.stateid));
2484                 largs.u.exist_lock = &el;
2485                 largs.new_lock_owner = 0;
2486                 arg.u.lock = &largs;
2487                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2488         }
2489         /* increment seqid on success, and * seqid mutating errors*/
2490         nfs4_increment_lock_seqid(status, lsp);
2491         /* save the returned stateid. */
2492         if (status == 0) {
2493                 memcpy(&lsp->ls_stateid, &res.u.stateid, sizeof(nfs4_stateid));
2494                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
2495                 if (!reclaim)
2496                         nfs4_notify_setlk(state, request, lsp);
2497         } else if (status == -NFS4ERR_DENIED)
2498                 status = -EAGAIN;
2499         nfs4_put_lock_state(lsp);
2500         return status;
2501 }
2502
2503 int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
2504 {
2505         return _nfs4_do_setlk(state, F_SETLK, request, 1);
2506 }
2507
2508 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2509 {
2510         struct nfs4_client *clp = state->owner->so_client;
2511         int status;
2512
2513         down_read(&clp->cl_sem);
2514         down(&state->lock_sema);
2515         status = _nfs4_do_setlk(state, cmd, request, 0);
2516         up(&state->lock_sema);
2517         if (status == 0) {
2518                 /* Note: we always want to sleep here! */
2519                 request->fl_flags |= FL_SLEEP;
2520                 if (posix_lock_file_wait(request->fl_file, request) < 0)
2521                         printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
2522         }
2523         up_read(&clp->cl_sem);
2524         return status;
2525 }
2526
2527 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2528 {
2529         struct nfs4_exception exception = { };
2530         int err;
2531
2532         do {
2533                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2534                                 _nfs4_proc_setlk(state, cmd, request),
2535                                 &exception);
2536         } while (exception.retry);
2537         return err;
2538 }
2539
2540 static int
2541 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
2542 {
2543         struct nfs_open_context *ctx;
2544         struct nfs4_state *state;
2545         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
2546         int status;
2547
2548         /* verify open state */
2549         ctx = (struct nfs_open_context *)filp->private_data;
2550         state = ctx->state;
2551
2552         if (request->fl_start < 0 || request->fl_end < 0)
2553                 return -EINVAL;
2554
2555         if (IS_GETLK(cmd))
2556                 return nfs4_proc_getlk(state, F_GETLK, request);
2557
2558         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
2559                 return -EINVAL;
2560
2561         if (request->fl_type == F_UNLCK)
2562                 return nfs4_proc_unlck(state, cmd, request);
2563
2564         do {
2565                 status = nfs4_proc_setlk(state, cmd, request);
2566                 if ((status != -EAGAIN) || IS_SETLK(cmd))
2567                         break;
2568                 timeout = nfs4_set_lock_task_retry(timeout);
2569                 status = -ERESTARTSYS;
2570                 if (signalled())
2571                         break;
2572         } while(status < 0);
2573
2574         return status;
2575 }
2576
2577 struct nfs_rpc_ops      nfs_v4_clientops = {
2578         .version        = 4,                    /* protocol version */
2579         .dentry_ops     = &nfs4_dentry_operations,
2580         .dir_inode_ops  = &nfs4_dir_inode_operations,
2581         .getroot        = nfs4_proc_get_root,
2582         .getattr        = nfs4_proc_getattr,
2583         .setattr        = nfs4_proc_setattr,
2584         .lookup         = nfs4_proc_lookup,
2585         .access         = nfs4_proc_access,
2586         .readlink       = nfs4_proc_readlink,
2587         .read           = nfs4_proc_read,
2588         .write          = nfs4_proc_write,
2589         .commit         = nfs4_proc_commit,
2590         .create         = nfs4_proc_create,
2591         .remove         = nfs4_proc_remove,
2592         .unlink_setup   = nfs4_proc_unlink_setup,
2593         .unlink_done    = nfs4_proc_unlink_done,
2594         .rename         = nfs4_proc_rename,
2595         .link           = nfs4_proc_link,
2596         .symlink        = nfs4_proc_symlink,
2597         .mkdir          = nfs4_proc_mkdir,
2598         .rmdir          = nfs4_proc_remove,
2599         .readdir        = nfs4_proc_readdir,
2600         .mknod          = nfs4_proc_mknod,
2601         .statfs         = nfs4_proc_statfs,
2602         .fsinfo         = nfs4_proc_fsinfo,
2603         .pathconf       = nfs4_proc_pathconf,
2604         .decode_dirent  = nfs4_decode_dirent,
2605         .read_setup     = nfs4_proc_read_setup,
2606         .write_setup    = nfs4_proc_write_setup,
2607         .commit_setup   = nfs4_proc_commit_setup,
2608         .file_open      = nfs4_proc_file_open,
2609         .file_release   = nfs4_proc_file_release,
2610         .lock           = nfs4_proc_lock,
2611 };
2612
2613 /*
2614  * Local variables:
2615  *  c-basic-offset: 8
2616  * End:
2617  */