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 qstr *name, 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           = 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 qstr *name, 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, name, 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 (sattr->ia_valid & ATTR_SIZE)
 639                 nfs4_copy_stateid(&arg.stateid, state, NULL);
 640         else
 641                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
 642
 643         return rpc_call_sync(server->client, &msg, 0);
 644 }
 645
 646 int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 647                 struct nfs_fh *fhandle, struct iattr *sattr,
 648                 struct nfs4_state *state)
 649 {
 650         struct nfs4_exception exception = { };
 651         int err;
 652         do {
 653                 err = nfs4_handle_exception(server,
 654                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
 655                                         state),
 656                                 &exception);
 657         } while (exception.retry);
 658         return err;
 659 }
 660
 661 /*
 662  * It is possible for data to be read/written from a mem-mapped file
 663  * after the sys_close call (which hits the vfs layer as a flush).
 664  * This means that we can't safely call nfsv4 close on a file until
 665  * the inode is cleared. This in turn means that we are not good
 666  * NFSv4 citizens - we do not indicate to the server to update the file's
 667  * share state even when we are done with one of the three share
 668  * stateid's in the inode.
 669  *
 670  * NOTE: Caller must be holding the sp->so_owner semaphore!
 671  */
 672 static int _nfs4_do_close(struct inode *inode, struct nfs4_state *state)
 673 {
 674         struct nfs4_state_owner *sp = state->owner;
 675         int status = 0;
 676         struct nfs_closeargs arg = {
 677                 .fh             = NFS_FH(inode),
 678         };
 679         struct nfs_closeres res;
 680         struct rpc_message msg = {
 681                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
 682                 .rpc_argp       = &arg,
 683                 .rpc_resp       = &res,
 684         };
 685
 686         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
 687                 return 0;
 688         memcpy(&arg.stateid, &state->stateid, sizeof(arg.stateid));
 689         /* Serialization for the sequence id */
 690         arg.seqid = sp->so_seqid,
 691         status = rpc_call_sync(NFS_SERVER(inode)->client, &msg, RPC_TASK_NOINTR);
 692
 693         /* hmm. we are done with the inode, and in the process of freeing
 694          * the state_owner. we keep this around to process errors
 695          */
 696         nfs4_increment_seqid(status, sp);
 697         if (!status)
 698                 memcpy(&state->stateid, &res.stateid, sizeof(state->stateid));
 699
 700         return status;
 701 }
 702
 703 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
 704 {
 705         struct nfs_server *server = NFS_SERVER(state->inode);
 706         struct nfs4_exception exception = { };
 707         int err;
 708         do {
 709                 err = _nfs4_do_close(inode, state);
 710                 switch (err) {
 711                         case -NFS4ERR_STALE_STATEID:
 712                         case -NFS4ERR_EXPIRED:
 713                                 nfs4_schedule_state_recovery(server->nfs4_state);
 714                                 err = 0;
 715                         default:
 716                                 state->state = 0;
 717                 }
 718                 err = nfs4_handle_exception(server, err, &exception);
 719         } while (exception.retry);
 720         return err;
 721 }
 722
 723 static int _nfs4_do_downgrade(struct inode *inode, struct nfs4_state *state, mode_t mode)
 724 {
 725         struct nfs4_state_owner *sp = state->owner;
 726         int status = 0;
 727         struct nfs_closeargs arg = {
 728                 .fh             = NFS_FH(inode),
 729                 .seqid          = sp->so_seqid,
 730                 .open_flags     = mode,
 731         };
 732         struct nfs_closeres res;
 733         struct rpc_message msg = {
 734                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE],
 735                 .rpc_argp       = &arg,
 736                 .rpc_resp       = &res,
 737         };
 738
 739         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
 740                 return 0;
 741         memcpy(&arg.stateid, &state->stateid, sizeof(arg.stateid));
 742         status = rpc_call_sync(NFS_SERVER(inode)->client, &msg, RPC_TASK_NOINTR);
 743         nfs4_increment_seqid(status, sp);
 744         if (!status)
 745                 memcpy(&state->stateid, &res.stateid, sizeof(state->stateid));
 746
 747         return status;
 748 }
 749
 750 int nfs4_do_downgrade(struct inode *inode, struct nfs4_state *state, mode_t mode)
 751 {
 752         struct nfs_server *server = NFS_SERVER(state->inode);
 753         struct nfs4_exception exception = { };
 754         int err;
 755         do {
 756                 err = _nfs4_do_downgrade(inode, state, mode);
 757                 switch (err) {
 758                         case -NFS4ERR_STALE_STATEID:
 759                         case -NFS4ERR_EXPIRED:
 760                                 nfs4_schedule_state_recovery(server->nfs4_state);
 761                                 err = 0;
 762                         default:
 763                                 state->state = mode;
 764                 }
 765                 err = nfs4_handle_exception(server, err, &exception);
 766         } while (exception.retry);
 767         return err;
 768 }
 769
 770 struct inode *
 771 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 772 {
 773         struct iattr attr;
 774         struct rpc_cred *cred;
 775         struct nfs4_state *state;
 776
 777         if (nd->flags & LOOKUP_CREATE) {
 778                 attr.ia_mode = nd->intent.open.create_mode;
 779                 attr.ia_valid = ATTR_MODE;
 780                 if (!IS_POSIXACL(dir))
 781                         attr.ia_mode &= ~current->fs->umask;
 782         } else {
 783                 attr.ia_valid = 0;
 784                 BUG_ON(nd->intent.open.flags & O_CREAT);
 785         }
 786
 787         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
 788         state = nfs4_do_open(dir, &dentry->d_name, nd->intent.open.flags, &attr, cred);
 789         put_rpccred(cred);
 790         if (IS_ERR(state))
 791                 return (struct inode *)state;
 792         return state->inode;
 793 }
 794
 795 int
 796 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags)
 797 {
 798         struct rpc_cred *cred;
 799         struct nfs4_state *state;
 800         struct inode *inode;
 801
 802         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
 803         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
 804         if (IS_ERR(state))
 805                 state = nfs4_do_open(dir, &dentry->d_name, openflags, NULL, cred);
 806         put_rpccred(cred);
 807         if (state == ERR_PTR(-ENOENT) && dentry->d_inode == 0)
 808                 return 1;
 809         if (IS_ERR(state))
 810                 return 0;
 811         inode = state->inode;
 812         if (inode == dentry->d_inode) {
 813                 iput(inode);
 814                 return 1;
 815         }
 816         d_drop(dentry);
 817         nfs4_close_state(state, openflags);
 818         iput(inode);
 819         return 0;
 820 }
 821
 822
 823 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
 824 {
 825         struct nfs4_server_caps_res res = {};
 826         struct rpc_message msg = {
 827                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
 828                 .rpc_argp = fhandle,
 829                 .rpc_resp = &res,
 830         };
 831         int status;
 832
 833         status = rpc_call_sync(server->client, &msg, 0);
 834         if (status == 0) {
 835                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
 836                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
 837                         server->caps |= NFS_CAP_ACLS;
 838                 if (res.has_links != 0)
 839                         server->caps |= NFS_CAP_HARDLINKS;
 840                 if (res.has_symlinks != 0)
 841                         server->caps |= NFS_CAP_SYMLINKS;
 842                 server->acl_bitmask = res.acl_bitmask;
 843         }
 844         return status;
 845 }
 846
 847 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
 848 {
 849         struct nfs4_exception exception = { };
 850         int err;
 851         do {
 852                 err = nfs4_handle_exception(server,
 853                                 _nfs4_server_capabilities(server, fhandle),
 854                                 &exception);
 855         } while (exception.retry);
 856         return err;
 857 }
 858
 859 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
 860                 struct nfs_fsinfo *info)
 861 {
 862         struct nfs_fattr *      fattr = info->fattr;
 863         struct nfs4_lookup_root_arg args = {
 864                 .bitmask = nfs4_fattr_bitmap,
 865         };
 866         struct nfs4_lookup_res res = {
 867                 .server = server,
 868                 .fattr = fattr,
 869                 .fh = fhandle,
 870         };
 871         struct rpc_message msg = {
 872                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
 873                 .rpc_argp = &args,
 874                 .rpc_resp = &res,
 875         };
 876         fattr->valid = 0;
 877         return rpc_call_sync(server->client, &msg, 0);
 878 }
 879
 880 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
 881                 struct nfs_fsinfo *info)
 882 {
 883         struct nfs4_exception exception = { };
 884         int err;
 885         do {
 886                 err = nfs4_handle_exception(server,
 887                                 _nfs4_lookup_root(server, fhandle, info),
 888                                 &exception);
 889         } while (exception.retry);
 890         return err;
 891 }
 892
 893 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
 894                 struct nfs_fsinfo *info)
 895 {
 896         struct nfs_fattr *      fattr = info->fattr;
 897         unsigned char *         p;
 898         struct qstr             q;
 899         struct nfs4_lookup_arg args = {
 900                 .dir_fh = fhandle,
 901                 .name = &q,
 902                 .bitmask = nfs4_fattr_bitmap,
 903         };
 904         struct nfs4_lookup_res res = {
 905                 .server = server,
 906                 .fattr = fattr,
 907                 .fh = fhandle,
 908         };
 909         struct rpc_message msg = {
 910                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
 911                 .rpc_argp = &args,
 912                 .rpc_resp = &res,
 913         };
 914         int status;
 915
 916         /*
 917          * Now we do a separate LOOKUP for each component of the mount path.
 918          * The LOOKUPs are done separately so that we can conveniently
 919          * catch an ERR_WRONGSEC if it occurs along the way...
 920          */
 921         status = nfs4_lookup_root(server, fhandle, info);
 922         if (status)
 923                 goto out;
 924
 925         p = server->mnt_path;
 926         for (;;) {
 927                 struct nfs4_exception exception = { };
 928
 929                 while (*p == '/')
 930                         p++;
 931                 if (!*p)
 932                         break;
 933                 q.name = p;
 934                 while (*p && (*p != '/'))
 935                         p++;
 936                 q.len = p - q.name;
 937
 938                 do {
 939                         fattr->valid = 0;
 940                         status = nfs4_handle_exception(server,
 941                                         rpc_call_sync(server->client, &msg, 0),
 942                                         &exception);
 943                 } while (exception.retry);
 944                 if (status == 0)
 945                         continue;
 946                 if (status == -ENOENT) {
 947                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
 948                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
 949                 }
 950                 break;
 951         }
 952         if (status == 0)
 953                 status = nfs4_server_capabilities(server, fhandle);
 954         if (status == 0)
 955                 status = nfs4_do_fsinfo(server, fhandle, info);
 956 out:
 957         return status;
 958 }
 959
 960 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 961 {
 962         struct nfs4_getattr_arg args = {
 963                 .fh = fhandle,
 964                 .bitmask = server->attr_bitmask,
 965         };
 966         struct nfs4_getattr_res res = {
 967                 .fattr = fattr,
 968                 .server = server,
 969         };
 970         struct rpc_message msg = {
 971                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
 972                 .rpc_argp = &args,
 973                 .rpc_resp = &res,
 974         };
 975
 976         fattr->valid = 0;
 977         return rpc_call_sync(server->client, &msg, 0);
 978 }
 979
 980 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 981 {
 982         struct nfs4_exception exception = { };
 983         int err;
 984         do {
 985                 err = nfs4_handle_exception(server,
 986                                 _nfs4_proc_getattr(server, fhandle, fattr),
 987                                 &exception);
 988         } while (exception.retry);
 989         return err;
 990 }
 991
 992 /*
 993  * The file is not closed if it is opened due to the a request to change
 994  * the size of the file. The open call will not be needed once the
 995  * VFS layer lookup-intents are implemented.
 996  *
 997  * Close is called when the inode is destroyed.
 998  * If we haven't opened the file for O_WRONLY, we
 999  * need to in the size_change case to obtain a stateid.
1000  *
1001  * Got race?
1002  * Because OPEN is always done by name in nfsv4, it is
1003  * possible that we opened a different file by the same
1004  * name.  We can recognize this race condition, but we
1005  * can't do anything about it besides returning an error.
1006  *
1007  * This will be fixed with VFS changes (lookup-intent).
1008  */
1009 static int
1010 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1011                   struct iattr *sattr)
1012 {
1013         struct inode *          inode = dentry->d_inode;
1014         int                     size_change = sattr->ia_valid & ATTR_SIZE;
1015         struct nfs4_state       *state = NULL;
1016         int need_iput = 0;
1017         int status;
1018
1019         fattr->valid = 0;
1020
1021         if (size_change) {
1022                 struct rpc_cred *cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1023                 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1024                 if (state == NULL) {
1025                         state = nfs4_open_delegated(dentry->d_inode,
1026                                         FMODE_WRITE, cred);
1027                         if (IS_ERR(state))
1028                                 state = nfs4_do_open(dentry->d_parent->d_inode,
1029                                                 &dentry->d_name, FMODE_WRITE,
1030                                                 NULL, cred);
1031                         need_iput = 1;
1032                 }
1033                 put_rpccred(cred);
1034                 if (IS_ERR(state))
1035                         return PTR_ERR(state);
1036
1037                 if (state->inode != inode) {
1038                         printk(KERN_WARNING "nfs: raced in setattr (%p != %p), returning -EIO\n", inode, state->inode);
1039                         status = -EIO;
1040                         goto out;
1041                 }
1042         }
1043         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1044                         NFS_FH(inode), sattr, state);
1045 out:
1046         if (state) {
1047                 inode = state->inode;
1048                 nfs4_close_state(state, FMODE_WRITE);
1049                 if (need_iput)
1050                         iput(inode);
1051         }
1052         return status;
1053 }
1054
1055 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1056                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1057 {
1058         int                    status;
1059         struct nfs_server *server = NFS_SERVER(dir);
1060         struct nfs4_lookup_arg args = {
1061                 .bitmask = server->attr_bitmask,
1062                 .dir_fh = NFS_FH(dir),
1063                 .name = name,
1064         };
1065         struct nfs4_lookup_res res = {
1066                 .server = server,
1067                 .fattr = fattr,
1068                 .fh = fhandle,
1069         };
1070         struct rpc_message msg = {
1071                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1072                 .rpc_argp = &args,
1073                 .rpc_resp = &res,
1074         };
1075
1076         fattr->valid = 0;
1077
1078         dprintk("NFS call  lookup %s\n", name->name);
1079         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1080         dprintk("NFS reply lookup: %d\n", status);
1081         return status;
1082 }
1083
1084 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1085 {
1086         struct nfs4_exception exception = { };
1087         int err;
1088         do {
1089                 err = nfs4_handle_exception(NFS_SERVER(dir),
1090                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1091                                 &exception);
1092         } while (exception.retry);
1093         return err;
1094 }
1095
1096 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1097 {
1098         struct nfs4_accessargs args = {
1099                 .fh = NFS_FH(inode),
1100         };
1101         struct nfs4_accessres res = { 0 };
1102         struct rpc_message msg = {
1103                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1104                 .rpc_argp = &args,
1105                 .rpc_resp = &res,
1106                 .rpc_cred = entry->cred,
1107         };
1108         int mode = entry->mask;
1109         int status;
1110
1111         /*
1112          * Determine which access bits we want to ask for...
1113          */
1114         if (mode & MAY_READ)
1115                 args.access |= NFS4_ACCESS_READ;
1116         if (S_ISDIR(inode->i_mode)) {
1117                 if (mode & MAY_WRITE)
1118                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1119                 if (mode & MAY_EXEC)
1120                         args.access |= NFS4_ACCESS_LOOKUP;
1121         } else {
1122                 if (mode & MAY_WRITE)
1123                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1124                 if (mode & MAY_EXEC)
1125                         args.access |= NFS4_ACCESS_EXECUTE;
1126         }
1127         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1128         if (!status) {
1129                 entry->mask = 0;
1130                 if (res.access & NFS4_ACCESS_READ)
1131                         entry->mask |= MAY_READ;
1132                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1133                         entry->mask |= MAY_WRITE;
1134                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1135                         entry->mask |= MAY_EXEC;
1136         }
1137         return status;
1138 }
1139
1140 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1141 {
1142         struct nfs4_exception exception = { };
1143         int err;
1144         do {
1145                 err = nfs4_handle_exception(NFS_SERVER(inode),
1146                                 _nfs4_proc_access(inode, entry),
1147                                 &exception);
1148         } while (exception.retry);
1149         return err;
1150 }
1151
1152 /*
1153  * TODO: For the time being, we don't try to get any attributes
1154  * along with any of the zero-copy operations READ, READDIR,
1155  * READLINK, WRITE.
1156  *
1157  * In the case of the first three, we want to put the GETATTR
1158  * after the read-type operation -- this is because it is hard
1159  * to predict the length of a GETATTR response in v4, and thus
1160  * align the READ data correctly.  This means that the GETATTR
1161  * may end up partially falling into the page cache, and we should
1162  * shift it into the 'tail' of the xdr_buf before processing.
1163  * To do this efficiently, we need to know the total length
1164  * of data received, which doesn't seem to be available outside
1165  * of the RPC layer.
1166  *
1167  * In the case of WRITE, we also want to put the GETATTR after
1168  * the operation -- in this case because we want to make sure
1169  * we get the post-operation mtime and size.  This means that
1170  * we can't use xdr_encode_pages() as written: we need a variant
1171  * of it which would leave room in the 'tail' iovec.
1172  *
1173  * Both of these changes to the XDR layer would in fact be quite
1174  * minor, but I decided to leave them for a subsequent patch.
1175  */
1176 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1177                 unsigned int pgbase, unsigned int pglen)
1178 {
1179         struct nfs4_readlink args = {
1180                 .fh       = NFS_FH(inode),
1181                 .pgbase   = pgbase,
1182                 .pglen    = pglen,
1183                 .pages    = &page,
1184         };
1185         struct rpc_message msg = {
1186                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1187                 .rpc_argp = &args,
1188                 .rpc_resp = NULL,
1189         };
1190
1191         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1192 }
1193
1194 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1195                 unsigned int pgbase, unsigned int pglen)
1196 {
1197         struct nfs4_exception exception = { };
1198         int err;
1199         do {
1200                 err = nfs4_handle_exception(NFS_SERVER(inode),
1201                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1202                                 &exception);
1203         } while (exception.retry);
1204         return err;
1205 }
1206
1207 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1208 {
1209         int flags = rdata->flags;
1210         struct inode *inode = rdata->inode;
1211         struct nfs_fattr *fattr = rdata->res.fattr;
1212         struct nfs_server *server = NFS_SERVER(inode);
1213         struct rpc_message msg = {
1214                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1215                 .rpc_argp       = &rdata->args,
1216                 .rpc_resp       = &rdata->res,
1217                 .rpc_cred       = rdata->cred,
1218         };
1219         unsigned long timestamp = jiffies;
1220         int status;
1221
1222         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1223                         (long long) rdata->args.offset);
1224
1225         fattr->valid = 0;
1226         status = rpc_call_sync(server->client, &msg, flags);
1227         if (!status)
1228                 renew_lease(server, timestamp);
1229         dprintk("NFS reply read: %d\n", status);
1230         return status;
1231 }
1232
1233 static int nfs4_proc_read(struct nfs_read_data *rdata)
1234 {
1235         struct nfs4_exception exception = { };
1236         int err;
1237         do {
1238                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1239                                 _nfs4_proc_read(rdata),
1240                                 &exception);
1241         } while (exception.retry);
1242         return err;
1243 }
1244
1245 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1246 {
1247         int rpcflags = wdata->flags;
1248         struct inode *inode = wdata->inode;
1249         struct nfs_fattr *fattr = wdata->res.fattr;
1250         struct nfs_server *server = NFS_SERVER(inode);
1251         struct rpc_message msg = {
1252                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1253                 .rpc_argp       = &wdata->args,
1254                 .rpc_resp       = &wdata->res,
1255                 .rpc_cred       = wdata->cred,
1256         };
1257         int status;
1258
1259         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1260                         (long long) wdata->args.offset);
1261
1262         fattr->valid = 0;
1263         status = rpc_call_sync(server->client, &msg, rpcflags);
1264         dprintk("NFS reply write: %d\n", status);
1265         return status;
1266 }
1267
1268 static int nfs4_proc_write(struct nfs_write_data *wdata)
1269 {
1270         struct nfs4_exception exception = { };
1271         int err;
1272         do {
1273                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1274                                 _nfs4_proc_write(wdata),
1275                                 &exception);
1276         } while (exception.retry);
1277         return err;
1278 }
1279
1280 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1281 {
1282         struct inode *inode = cdata->inode;
1283         struct nfs_fattr *fattr = cdata->res.fattr;
1284         struct nfs_server *server = NFS_SERVER(inode);
1285         struct rpc_message msg = {
1286                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1287                 .rpc_argp       = &cdata->args,
1288                 .rpc_resp       = &cdata->res,
1289                 .rpc_cred       = cdata->cred,
1290         };
1291         int status;
1292
1293         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1294                         (long long) cdata->args.offset);
1295
1296         fattr->valid = 0;
1297         status = rpc_call_sync(server->client, &msg, 0);
1298         dprintk("NFS reply commit: %d\n", status);
1299         return status;
1300 }
1301
1302 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1303 {
1304         struct nfs4_exception exception = { };
1305         int err;
1306         do {
1307                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1308                                 _nfs4_proc_commit(cdata),
1309                                 &exception);
1310         } while (exception.retry);
1311         return err;
1312 }
1313
1314 /*
1315  * Got race?
1316  * We will need to arrange for the VFS layer to provide an atomic open.
1317  * Until then, this create/open method is prone to inefficiency and race
1318  * conditions due to the lookup, create, and open VFS calls from sys_open()
1319  * placed on the wire.
1320  *
1321  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1322  * The file will be opened again in the subsequent VFS open call
1323  * (nfs4_proc_file_open).
1324  *
1325  * The open for read will just hang around to be used by any process that
1326  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1327  */
1328
1329 static struct inode *
1330 nfs4_proc_create(struct inode *dir, struct qstr *name, struct iattr *sattr,
1331                  int flags)
1332 {
1333         struct inode *inode;
1334         struct nfs4_state *state = NULL;
1335         struct rpc_cred *cred;
1336
1337         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1338         state = nfs4_do_open(dir, name, flags, sattr, cred);
1339         put_rpccred(cred);
1340         if (!IS_ERR(state)) {
1341                 inode = state->inode;
1342                 if (flags & O_EXCL) {
1343                         struct nfs_fattr fattr;
1344                         int status;
1345                         status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1346                                              NFS_FH(inode), sattr, state);
1347                         if (status != 0) {
1348                                 nfs4_close_state(state, flags);
1349                                 iput(inode);
1350                                 inode = ERR_PTR(status);
1351                         }
1352                 }
1353         } else
1354                 inode = (struct inode *)state;
1355         return inode;
1356 }
1357
1358 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1359 {
1360         struct nfs4_remove_arg args = {
1361                 .fh = NFS_FH(dir),
1362                 .name = name,
1363         };
1364         struct nfs4_change_info res;
1365         struct rpc_message msg = {
1366                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1367                 .rpc_argp       = &args,
1368                 .rpc_resp       = &res,
1369         };
1370         int                     status;
1371
1372         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1373         if (status == 0)
1374                 update_changeattr(dir, &res);
1375         return status;
1376 }
1377
1378 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1379 {
1380         struct nfs4_exception exception = { };
1381         int err;
1382         do {
1383                 err = nfs4_handle_exception(NFS_SERVER(dir),
1384                                 _nfs4_proc_remove(dir, name),
1385                                 &exception);
1386         } while (exception.retry);
1387         return err;
1388 }
1389
1390 struct unlink_desc {
1391         struct nfs4_remove_arg  args;
1392         struct nfs4_change_info res;
1393 };
1394
1395 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1396                 struct qstr *name)
1397 {
1398         struct unlink_desc *up;
1399
1400         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1401         if (!up)
1402                 return -ENOMEM;
1403
1404         up->args.fh = NFS_FH(dir->d_inode);
1405         up->args.name = name;
1406
1407         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1408         msg->rpc_argp = &up->args;
1409         msg->rpc_resp = &up->res;
1410         return 0;
1411 }
1412
1413 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1414 {
1415         struct rpc_message *msg = &task->tk_msg;
1416         struct unlink_desc *up;
1417
1418         if (msg->rpc_resp != NULL) {
1419                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1420                 update_changeattr(dir->d_inode, &up->res);
1421                 kfree(up);
1422                 msg->rpc_resp = NULL;
1423                 msg->rpc_argp = NULL;
1424         }
1425         return 0;
1426 }
1427
1428 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1429                 struct inode *new_dir, struct qstr *new_name)
1430 {
1431         struct nfs4_rename_arg arg = {
1432                 .old_dir = NFS_FH(old_dir),
1433                 .new_dir = NFS_FH(new_dir),
1434                 .old_name = old_name,
1435                 .new_name = new_name,
1436         };
1437         struct nfs4_rename_res res = { };
1438         struct rpc_message msg = {
1439                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1440                 .rpc_argp = &arg,
1441                 .rpc_resp = &res,
1442         };
1443         int                     status;
1444
1445         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
1446
1447         if (!status) {
1448                 update_changeattr(old_dir, &res.old_cinfo);
1449                 update_changeattr(new_dir, &res.new_cinfo);
1450         }
1451         return status;
1452 }
1453
1454 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1455                 struct inode *new_dir, struct qstr *new_name)
1456 {
1457         struct nfs4_exception exception = { };
1458         int err;
1459         do {
1460                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1461                                 _nfs4_proc_rename(old_dir, old_name,
1462                                         new_dir, new_name),
1463                                 &exception);
1464         } while (exception.retry);
1465         return err;
1466 }
1467
1468 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1469 {
1470         struct nfs4_link_arg arg = {
1471                 .fh     = NFS_FH(inode),
1472                 .dir_fh = NFS_FH(dir),
1473                 .name   = name,
1474         };
1475         struct nfs4_change_info cinfo = { };
1476         struct rpc_message msg = {
1477                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1478                 .rpc_argp = &arg,
1479                 .rpc_resp = &cinfo,
1480         };
1481         int                     status;
1482
1483         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1484         if (!status)
1485                 update_changeattr(dir, &cinfo);
1486
1487         return status;
1488 }
1489
1490 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1491 {
1492         struct nfs4_exception exception = { };
1493         int err;
1494         do {
1495                 err = nfs4_handle_exception(NFS_SERVER(inode),
1496                                 _nfs4_proc_link(inode, dir, name),
1497                                 &exception);
1498         } while (exception.retry);
1499         return err;
1500 }
1501
1502 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1503                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1504                 struct nfs_fattr *fattr)
1505 {
1506         struct nfs_server *server = NFS_SERVER(dir);
1507         struct nfs4_create_arg arg = {
1508                 .dir_fh = NFS_FH(dir),
1509                 .server = server,
1510                 .name = name,
1511                 .attrs = sattr,
1512                 .ftype = NF4LNK,
1513                 .bitmask = server->attr_bitmask,
1514         };
1515         struct nfs4_create_res res = {
1516                 .server = server,
1517                 .fh = fhandle,
1518                 .fattr = fattr,
1519         };
1520         struct rpc_message msg = {
1521                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1522                 .rpc_argp = &arg,
1523                 .rpc_resp = &res,
1524         };
1525         int                     status;
1526
1527         if (path->len > NFS4_MAXPATHLEN)
1528                 return -ENAMETOOLONG;
1529         arg.u.symlink = path;
1530         fattr->valid = 0;
1531
1532         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1533         if (!status)
1534                 update_changeattr(dir, &res.dir_cinfo);
1535         return status;
1536 }
1537
1538 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1539                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1540                 struct nfs_fattr *fattr)
1541 {
1542         struct nfs4_exception exception = { };
1543         int err;
1544         do {
1545                 err = nfs4_handle_exception(NFS_SERVER(dir),
1546                                 _nfs4_proc_symlink(dir, name, path, sattr,
1547                                         fhandle, fattr),
1548                                 &exception);
1549         } while (exception.retry);
1550         return err;
1551 }
1552
1553 static int _nfs4_proc_mkdir(struct inode *dir, struct qstr *name,
1554                 struct iattr *sattr, struct nfs_fh *fhandle,
1555                 struct nfs_fattr *fattr)
1556 {
1557         struct nfs_server *server = NFS_SERVER(dir);
1558         struct nfs4_create_arg arg = {
1559                 .dir_fh = NFS_FH(dir),
1560                 .server = server,
1561                 .name = name,
1562                 .attrs = sattr,
1563                 .ftype = NF4DIR,
1564                 .bitmask = server->attr_bitmask,
1565         };
1566         struct nfs4_create_res res = {
1567                 .server = server,
1568                 .fh = fhandle,
1569                 .fattr = fattr,
1570         };
1571         struct rpc_message msg = {
1572                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1573                 .rpc_argp = &arg,
1574                 .rpc_resp = &res,
1575         };
1576         int                     status;
1577
1578         fattr->valid = 0;
1579
1580         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1581         if (!status)
1582                 update_changeattr(dir, &res.dir_cinfo);
1583         return status;
1584 }
1585
1586 static int nfs4_proc_mkdir(struct inode *dir, struct qstr *name,
1587                 struct iattr *sattr, struct nfs_fh *fhandle,
1588                 struct nfs_fattr *fattr)
1589 {
1590         struct nfs4_exception exception = { };
1591         int err;
1592         do {
1593                 err = nfs4_handle_exception(NFS_SERVER(dir),
1594                                 _nfs4_proc_mkdir(dir, name, sattr,
1595                                         fhandle, fattr),
1596                                 &exception);
1597         } while (exception.retry);
1598         return err;
1599 }
1600
1601 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1602                   u64 cookie, struct page *page, unsigned int count, int plus)
1603 {
1604         struct inode            *dir = dentry->d_inode;
1605         struct nfs4_readdir_arg args = {
1606                 .fh = NFS_FH(dir),
1607                 .pages = &page,
1608                 .pgbase = 0,
1609                 .count = count,
1610         };
1611         struct nfs4_readdir_res res;
1612         struct rpc_message msg = {
1613                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1614                 .rpc_argp = &args,
1615                 .rpc_resp = &res,
1616                 .rpc_cred = cred,
1617         };
1618         int                     status;
1619
1620         lock_kernel();
1621         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1622         res.pgbase = args.pgbase;
1623         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1624         if (status == 0)
1625                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1626         unlock_kernel();
1627         return status;
1628 }
1629
1630 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1631                   u64 cookie, struct page *page, unsigned int count, int plus)
1632 {
1633         struct nfs4_exception exception = { };
1634         int err;
1635         do {
1636                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1637                                 _nfs4_proc_readdir(dentry, cred, cookie,
1638                                         page, count, plus),
1639                                 &exception);
1640         } while (exception.retry);
1641         return err;
1642 }
1643
1644 static int _nfs4_proc_mknod(struct inode *dir, struct qstr *name,
1645                 struct iattr *sattr, dev_t rdev, struct nfs_fh *fh,
1646                 struct nfs_fattr *fattr)
1647 {
1648         struct nfs_server *server = NFS_SERVER(dir);
1649         struct nfs4_create_arg arg = {
1650                 .dir_fh = NFS_FH(dir),
1651                 .server = server,
1652                 .name = name,
1653                 .attrs = sattr,
1654                 .bitmask = server->attr_bitmask,
1655         };
1656         struct nfs4_create_res res = {
1657                 .server = server,
1658                 .fh = fh,
1659                 .fattr = fattr,
1660         };
1661         struct rpc_message msg = {
1662                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1663                 .rpc_argp = &arg,
1664                 .rpc_resp = &res,
1665         };
1666         int                     status;
1667         int                     mode = sattr->ia_mode;
1668
1669         fattr->valid = 0;
1670
1671         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1672         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1673         if (S_ISFIFO(mode))
1674                 arg.ftype = NF4FIFO;
1675         else if (S_ISBLK(mode)) {
1676                 arg.ftype = NF4BLK;
1677                 arg.u.device.specdata1 = MAJOR(rdev);
1678                 arg.u.device.specdata2 = MINOR(rdev);
1679         }
1680         else if (S_ISCHR(mode)) {
1681                 arg.ftype = NF4CHR;
1682                 arg.u.device.specdata1 = MAJOR(rdev);
1683                 arg.u.device.specdata2 = MINOR(rdev);
1684         }
1685         else
1686                 arg.ftype = NF4SOCK;
1687
1688         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1689         if (!status)
1690                 update_changeattr(dir, &res.dir_cinfo);
1691         return status;
1692 }
1693
1694 static int nfs4_proc_mknod(struct inode *dir, struct qstr *name,
1695                 struct iattr *sattr, dev_t rdev, struct nfs_fh *fh,
1696                 struct nfs_fattr *fattr)
1697 {
1698         struct nfs4_exception exception = { };
1699         int err;
1700         do {
1701                 err = nfs4_handle_exception(NFS_SERVER(dir),
1702                                 _nfs4_proc_mknod(dir, name, sattr, rdev,
1703                                         fh, fattr),
1704                                 &exception);
1705         } while (exception.retry);
1706         return err;
1707 }
1708
1709 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
1710                  struct nfs_fsstat *fsstat)
1711 {
1712         struct nfs4_statfs_arg args = {
1713                 .fh = fhandle,
1714                 .bitmask = server->attr_bitmask,
1715         };
1716         struct rpc_message msg = {
1717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
1718                 .rpc_argp = &args,
1719                 .rpc_resp = fsstat,
1720         };
1721
1722         fsstat->fattr->valid = 0;
1723         return rpc_call_sync(server->client, &msg, 0);
1724 }
1725
1726 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
1727 {
1728         struct nfs4_exception exception = { };
1729         int err;
1730         do {
1731                 err = nfs4_handle_exception(server,
1732                                 _nfs4_proc_statfs(server, fhandle, fsstat),
1733                                 &exception);
1734         } while (exception.retry);
1735         return err;
1736 }
1737
1738 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
1739                 struct nfs_fsinfo *fsinfo)
1740 {
1741         struct nfs4_fsinfo_arg args = {
1742                 .fh = fhandle,
1743                 .bitmask = server->attr_bitmask,
1744         };
1745         struct rpc_message msg = {
1746                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
1747                 .rpc_argp = &args,
1748                 .rpc_resp = fsinfo,
1749         };
1750
1751         return rpc_call_sync(server->client, &msg, 0);
1752 }
1753
1754 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
1755 {
1756         struct nfs4_exception exception = { };
1757         int err;
1758
1759         do {
1760                 err = nfs4_handle_exception(server,
1761                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
1762                                 &exception);
1763         } while (exception.retry);
1764         return err;
1765 }
1766
1767 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
1768 {
1769         fsinfo->fattr->valid = 0;
1770         return nfs4_do_fsinfo(server, fhandle, fsinfo);
1771 }
1772
1773 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
1774                 struct nfs_pathconf *pathconf)
1775 {
1776         struct nfs4_pathconf_arg args = {
1777                 .fh = fhandle,
1778                 .bitmask = server->attr_bitmask,
1779         };
1780         struct rpc_message msg = {
1781                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
1782                 .rpc_argp = &args,
1783                 .rpc_resp = pathconf,
1784         };
1785
1786         /* None of the pathconf attributes are mandatory to implement */
1787         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
1788                 memset(pathconf, 0, sizeof(*pathconf));
1789                 return 0;
1790         }
1791
1792         pathconf->fattr->valid = 0;
1793         return rpc_call_sync(server->client, &msg, 0);
1794 }
1795
1796 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
1797                 struct nfs_pathconf *pathconf)
1798 {
1799         struct nfs4_exception exception = { };
1800         int err;
1801
1802         do {
1803                 err = nfs4_handle_exception(server,
1804                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
1805                                 &exception);
1806         } while (exception.retry);
1807         return err;
1808 }
1809
1810 static void
1811 nfs4_read_done(struct rpc_task *task)
1812 {
1813         struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
1814         struct inode *inode = data->inode;
1815
1816         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
1817                 rpc_restart_call(task);
1818                 return;
1819         }
1820         if (task->tk_status > 0)
1821                 renew_lease(NFS_SERVER(inode), data->timestamp);
1822         /* Call back common NFS readpage processing */
1823         nfs_readpage_result(task);
1824 }
1825
1826 static void
1827 nfs4_proc_read_setup(struct nfs_read_data *data)
1828 {
1829         struct rpc_task *task = &data->task;
1830         struct rpc_message msg = {
1831                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
1832                 .rpc_argp = &data->args,
1833                 .rpc_resp = &data->res,
1834                 .rpc_cred = data->cred,
1835         };
1836         struct inode *inode = data->inode;
1837         int flags;
1838
1839         data->timestamp   = jiffies;
1840
1841         /* N.B. Do we need to test? Never called for swapfile inode */
1842         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
1843
1844         /* Finalize the task. */
1845         rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
1846         rpc_call_setup(task, &msg, 0);
1847 }
1848
1849 static void
1850 nfs4_write_done(struct rpc_task *task)
1851 {
1852         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
1853         struct inode *inode = data->inode;
1854
1855         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
1856                 rpc_restart_call(task);
1857                 return;
1858         }
1859         if (task->tk_status >= 0)
1860                 renew_lease(NFS_SERVER(inode), data->timestamp);
1861         /* Call back common NFS writeback processing */
1862         nfs_writeback_done(task);
1863 }
1864
1865 static void
1866 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
1867 {
1868         struct rpc_task *task = &data->task;
1869         struct rpc_message msg = {
1870                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1871                 .rpc_argp = &data->args,
1872                 .rpc_resp = &data->res,
1873                 .rpc_cred = data->cred,
1874         };
1875         struct inode *inode = data->inode;
1876         int stable;
1877         int flags;
1878
1879         if (how & FLUSH_STABLE) {
1880                 if (!NFS_I(inode)->ncommit)
1881                         stable = NFS_FILE_SYNC;
1882                 else
1883                         stable = NFS_DATA_SYNC;
1884         } else
1885                 stable = NFS_UNSTABLE;
1886         data->args.stable = stable;
1887
1888         data->timestamp   = jiffies;
1889
1890         /* Set the initial flags for the task.  */
1891         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
1892
1893         /* Finalize the task. */
1894         rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
1895         rpc_call_setup(task, &msg, 0);
1896 }
1897
1898 static void
1899 nfs4_commit_done(struct rpc_task *task)
1900 {
1901         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
1902         struct inode *inode = data->inode;
1903
1904         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
1905                 rpc_restart_call(task);
1906                 return;
1907         }
1908         /* Call back common NFS writeback processing */
1909         nfs_commit_done(task);
1910 }
1911
1912 static void
1913 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
1914 {
1915         struct rpc_task *task = &data->task;
1916         struct rpc_message msg = {
1917                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1918                 .rpc_argp = &data->args,
1919                 .rpc_resp = &data->res,
1920                 .rpc_cred = data->cred,
1921         };
1922         struct inode *inode = data->inode;
1923         int flags;
1924
1925         /* Set the initial flags for the task.  */
1926         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
1927
1928         /* Finalize the task. */
1929         rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
1930         rpc_call_setup(task, &msg, 0);
1931 }
1932
1933 /*
1934  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
1935  * standalone procedure for queueing an asynchronous RENEW.
1936  */
1937 static void
1938 renew_done(struct rpc_task *task)
1939 {
1940         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
1941         unsigned long timestamp = (unsigned long)task->tk_calldata;
1942
1943         if (task->tk_status < 0) {
1944                 switch (task->tk_status) {
1945                         case -NFS4ERR_STALE_CLIENTID:
1946                         case -NFS4ERR_EXPIRED:
1947                         case -NFS4ERR_CB_PATH_DOWN:
1948                                 nfs4_schedule_state_recovery(clp);
1949                 }
1950                 return;
1951         }
1952         spin_lock(&clp->cl_lock);
1953         if (time_before(clp->cl_last_renewal,timestamp))
1954                 clp->cl_last_renewal = timestamp;
1955         spin_unlock(&clp->cl_lock);
1956 }
1957
1958 int
1959 nfs4_proc_async_renew(struct nfs4_client *clp)
1960 {
1961         struct rpc_message msg = {
1962                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
1963                 .rpc_argp       = clp,
1964                 .rpc_cred       = clp->cl_cred,
1965         };
1966
1967         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
1968                         renew_done, (void *)jiffies);
1969 }
1970
1971 int
1972 nfs4_proc_renew(struct nfs4_client *clp)
1973 {
1974         struct rpc_message msg = {
1975                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
1976                 .rpc_argp       = clp,
1977                 .rpc_cred       = clp->cl_cred,
1978         };
1979         unsigned long now = jiffies;
1980         int status;
1981
1982         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
1983         if (status < 0)
1984                 return status;
1985         spin_lock(&clp->cl_lock);
1986         if (time_before(clp->cl_last_renewal,now))
1987                 clp->cl_last_renewal = now;
1988         spin_unlock(&clp->cl_lock);
1989         return 0;
1990 }
1991
1992 /*
1993  * We will need to arrange for the VFS layer to provide an atomic open.
1994  * Until then, this open method is prone to inefficiency and race conditions
1995  * due to the lookup, potential create, and open VFS calls from sys_open()
1996  * placed on the wire.
1997  */
1998 static int
1999 nfs4_proc_file_open(struct inode *inode, struct file *filp)
2000 {
2001         struct dentry *dentry = filp->f_dentry;
2002         struct nfs_open_context *ctx;
2003         struct nfs4_state *state = NULL;
2004         struct rpc_cred *cred;
2005         int status = -ENOMEM;
2006
2007         dprintk("nfs4_proc_file_open: starting on (%.*s/%.*s)\n",
2008                                (int)dentry->d_parent->d_name.len,
2009                                dentry->d_parent->d_name.name,
2010                                (int)dentry->d_name.len, dentry->d_name.name);
2011
2012
2013         /* Find our open stateid */
2014         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
2015         if (unlikely(cred == NULL))
2016                 return -ENOMEM;
2017         ctx = alloc_nfs_open_context(dentry, cred);
2018         put_rpccred(cred);
2019         if (unlikely(ctx == NULL))
2020                 return -ENOMEM;
2021         status = -EIO; /* ERACE actually */
2022         state = nfs4_find_state(inode, cred, filp->f_mode);
2023         if (unlikely(state == NULL))
2024                 goto no_state;
2025         ctx->state = state;
2026         nfs4_close_state(state, filp->f_mode);
2027         ctx->mode = filp->f_mode;
2028         nfs_file_set_open_context(filp, ctx);
2029         put_nfs_open_context(ctx);
2030         if (filp->f_mode & FMODE_WRITE)
2031                 nfs_begin_data_update(inode);
2032         return 0;
2033 no_state:
2034         printk(KERN_WARNING "NFS: v4 raced in function %s\n", __FUNCTION__);
2035         put_nfs_open_context(ctx);
2036         return status;
2037 }
2038
2039 /*
2040  * Release our state
2041  */
2042 static int
2043 nfs4_proc_file_release(struct inode *inode, struct file *filp)
2044 {
2045         if (filp->f_mode & FMODE_WRITE)
2046                 nfs_end_data_update(inode);
2047         nfs_file_clear_open_context(filp);
2048         return 0;
2049 }
2050
2051 static int
2052 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server)
2053 {
2054         struct nfs4_client *clp = server->nfs4_state;
2055
2056         if (!clp || task->tk_status >= 0)
2057                 return 0;
2058         switch(task->tk_status) {
2059                 case -NFS4ERR_STALE_CLIENTID:
2060                 case -NFS4ERR_STALE_STATEID:
2061                 case -NFS4ERR_EXPIRED:
2062                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2063                         nfs4_schedule_state_recovery(clp);
2064                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2065                                 rpc_wake_up_task(task);
2066                         task->tk_status = 0;
2067                         return -EAGAIN;
2068                 case -NFS4ERR_GRACE:
2069                 case -NFS4ERR_DELAY:
2070                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2071                         task->tk_status = 0;
2072                         return -EAGAIN;
2073                 case -NFS4ERR_OLD_STATEID:
2074                         task->tk_status = 0;
2075                         return -EAGAIN;
2076         }
2077         task->tk_status = nfs4_map_errors(task->tk_status);
2078         return 0;
2079 }
2080
2081 int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2082 {
2083         DEFINE_WAIT(wait);
2084         sigset_t oldset;
2085         int interruptible, res = 0;
2086
2087         might_sleep();
2088
2089         rpc_clnt_sigmask(clnt, &oldset);
2090         interruptible = TASK_UNINTERRUPTIBLE;
2091         if (clnt->cl_intr)
2092                 interruptible = TASK_INTERRUPTIBLE;
2093         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2094         nfs4_schedule_state_recovery(clp);
2095         if (clnt->cl_intr && signalled())
2096                 res = -ERESTARTSYS;
2097         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2098                 schedule();
2099         finish_wait(&clp->cl_waitq, &wait);
2100         rpc_clnt_sigunmask(clnt, &oldset);
2101         return res;
2102 }
2103
2104 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2105 {
2106         sigset_t oldset;
2107         int res = 0;
2108
2109         might_sleep();
2110
2111         if (*timeout <= 0)
2112                 *timeout = NFS4_POLL_RETRY_MIN;
2113         if (*timeout > NFS4_POLL_RETRY_MAX)
2114                 *timeout = NFS4_POLL_RETRY_MAX;
2115         rpc_clnt_sigmask(clnt, &oldset);
2116         if (clnt->cl_intr) {
2117                 set_current_state(TASK_INTERRUPTIBLE);
2118                 schedule_timeout(*timeout);
2119                 if (signalled())
2120                         res = -ERESTARTSYS;
2121         } else {
2122                 set_current_state(TASK_UNINTERRUPTIBLE);
2123                 schedule_timeout(*timeout);
2124         }
2125         rpc_clnt_sigunmask(clnt, &oldset);
2126         *timeout <<= 1;
2127         return res;
2128 }
2129
2130 /* This is the error handling routine for processes that are allowed
2131  * to sleep.
2132  */
2133 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2134 {
2135         struct nfs4_client *clp = server->nfs4_state;
2136         int ret = errorcode;
2137
2138         exception->retry = 0;
2139         switch(errorcode) {
2140                 case 0:
2141                         return 0;
2142                 case -NFS4ERR_STALE_CLIENTID:
2143                 case -NFS4ERR_STALE_STATEID:
2144                 case -NFS4ERR_EXPIRED:
2145                         ret = nfs4_wait_clnt_recover(server->client, clp);
2146                         if (ret == 0)
2147                                 exception->retry = 1;
2148                         break;
2149                 case -NFS4ERR_GRACE:
2150                 case -NFS4ERR_DELAY:
2151                         ret = nfs4_delay(server->client, &exception->timeout);
2152                         if (ret == 0)
2153                                 exception->retry = 1;
2154                         break;
2155                 case -NFS4ERR_OLD_STATEID:
2156                         if (ret == 0)
2157                                 exception->retry = 1;
2158         }
2159         /* We failed to handle the error */
2160         return nfs4_map_errors(ret);
2161 }
2162
2163 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2164 {
2165         static nfs4_verifier sc_verifier;
2166         static int initialized;
2167
2168         struct nfs4_setclientid setclientid = {
2169                 .sc_verifier = &sc_verifier,
2170                 .sc_prog = program,
2171         };
2172         struct rpc_message msg = {
2173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2174                 .rpc_argp = &setclientid,
2175                 .rpc_resp = clp,
2176                 .rpc_cred = clp->cl_cred,
2177         };
2178
2179         if (!initialized) {
2180                 struct timespec boot_time;
2181                 u32 *p;
2182
2183                 initialized = 1;
2184                 boot_time = CURRENT_TIME;
2185                 p = (u32*)sc_verifier.data;
2186                 *p++ = htonl((u32)boot_time.tv_sec);
2187                 *p = htonl((u32)boot_time.tv_nsec);
2188         }
2189         setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2190                         sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u",
2191                         clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr));
2192         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2193                         sizeof(setclientid.sc_netid), "tcp");
2194         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2195                         sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2196                         clp->cl_ipaddr, port >> 8, port & 255);
2197
2198         return rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2199 }
2200
2201 int
2202 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2203 {
2204         struct nfs_fsinfo fsinfo;
2205         struct rpc_message msg = {
2206                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2207                 .rpc_argp = clp,
2208                 .rpc_resp = &fsinfo,
2209                 .rpc_cred = clp->cl_cred,
2210         };
2211         unsigned long now;
2212         int status;
2213
2214         now = jiffies;
2215         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2216         if (status == 0) {
2217                 spin_lock(&clp->cl_lock);
2218                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2219                 clp->cl_last_renewal = now;
2220                 spin_unlock(&clp->cl_lock);
2221         }
2222         return status;
2223 }
2224
2225 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2226 {
2227         struct nfs4_delegreturnargs args = {
2228                 .fhandle = NFS_FH(inode),
2229                 .stateid = stateid,
2230         };
2231         struct rpc_message msg = {
2232                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2233                 .rpc_argp = &args,
2234                 .rpc_cred = cred,
2235         };
2236
2237         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2238 }
2239
2240 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2241 {
2242         struct nfs_server *server = NFS_SERVER(inode);
2243         struct nfs4_exception exception = { };
2244         int err;
2245         do {
2246                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2247                 switch (err) {
2248                         case -NFS4ERR_STALE_STATEID:
2249                         case -NFS4ERR_EXPIRED:
2250                                 nfs4_schedule_state_recovery(server->nfs4_state);
2251                         case 0:
2252                                 return 0;
2253                 }
2254                 err = nfs4_handle_exception(server, err, &exception);
2255         } while (exception.retry);
2256         return err;
2257 }
2258
2259 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2260 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2261
2262 /*
2263  * sleep, with exponential backoff, and retry the LOCK operation.
2264  */
2265 static unsigned long
2266 nfs4_set_lock_task_retry(unsigned long timeout)
2267 {
2268         current->state = TASK_INTERRUPTIBLE;
2269         schedule_timeout(timeout);
2270         timeout <<= 1;
2271         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2272                 return NFS4_LOCK_MAXTIMEOUT;
2273         return timeout;
2274 }
2275
2276 static inline int
2277 nfs4_lck_type(int cmd, struct file_lock *request)
2278 {
2279         /* set lock type */
2280         switch (request->fl_type) {
2281                 case F_RDLCK:
2282                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2283                 case F_WRLCK:
2284                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2285                 case F_UNLCK:
2286                         return NFS4_WRITE_LT;
2287         }
2288         BUG();
2289         return 0;
2290 }
2291
2292 static inline uint64_t
2293 nfs4_lck_length(struct file_lock *request)
2294 {
2295         if (request->fl_end == OFFSET_MAX)
2296                 return ~(uint64_t)0;
2297         return request->fl_end - request->fl_start + 1;
2298 }
2299
2300 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2301 {
2302         struct inode *inode = state->inode;
2303         struct nfs_server *server = NFS_SERVER(inode);
2304         struct nfs4_client *clp = server->nfs4_state;
2305         struct nfs_lockargs arg = {
2306                 .fh = NFS_FH(inode),
2307                 .type = nfs4_lck_type(cmd, request),
2308                 .offset = request->fl_start,
2309                 .length = nfs4_lck_length(request),
2310         };
2311         struct nfs_lockres res = {
2312                 .server = server,
2313         };
2314         struct rpc_message msg = {
2315                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2316                 .rpc_argp       = &arg,
2317                 .rpc_resp       = &res,
2318                 .rpc_cred       = state->owner->so_cred,
2319         };
2320         struct nfs_lowner nlo;
2321         struct nfs4_lock_state *lsp;
2322         int status;
2323
2324         down_read(&clp->cl_sem);
2325         nlo.clientid = clp->cl_clientid;
2326         down(&state->lock_sema);
2327         lsp = nfs4_find_lock_state(state, request->fl_owner);
2328         if (lsp)
2329                 nlo.id = lsp->ls_id;
2330         else {
2331                 spin_lock(&clp->cl_lock);
2332                 nlo.id = nfs4_alloc_lockowner_id(clp);
2333                 spin_unlock(&clp->cl_lock);
2334         }
2335         arg.u.lockt = &nlo;
2336         status = rpc_call_sync(server->client, &msg, 0);
2337         if (!status) {
2338                 request->fl_type = F_UNLCK;
2339         } else if (status == -NFS4ERR_DENIED) {
2340                 int64_t len, start, end;
2341                 start = res.u.denied.offset;
2342                 len = res.u.denied.length;
2343                 end = start + len - 1;
2344                 if (end < 0 || len == 0)
2345                         request->fl_end = OFFSET_MAX;
2346                 else
2347                         request->fl_end = (loff_t)end;
2348                 request->fl_start = (loff_t)start;
2349                 request->fl_type = F_WRLCK;
2350                 if (res.u.denied.type & 1)
2351                         request->fl_type = F_RDLCK;
2352                 request->fl_pid = 0;
2353                 status = 0;
2354         }
2355         if (lsp)
2356                 nfs4_put_lock_state(lsp);
2357         up(&state->lock_sema);
2358         up_read(&clp->cl_sem);
2359         return status;
2360 }
2361
2362 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2363 {
2364         struct nfs4_exception exception = { };
2365         int err;
2366
2367         do {
2368                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2369                                 _nfs4_proc_getlk(state, cmd, request),
2370                                 &exception);
2371         } while (exception.retry);
2372         return err;
2373 }
2374
2375 static int _nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2376 {
2377         struct inode *inode = state->inode;
2378         struct nfs_server *server = NFS_SERVER(inode);
2379         struct nfs4_client *clp = server->nfs4_state;
2380         struct nfs_lockargs arg = {
2381                 .fh = NFS_FH(inode),
2382                 .type = nfs4_lck_type(cmd, request),
2383                 .offset = request->fl_start,
2384                 .length = nfs4_lck_length(request),
2385         };
2386         struct nfs_lockres res = {
2387                 .server = server,
2388         };
2389         struct rpc_message msg = {
2390                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2391                 .rpc_argp       = &arg,
2392                 .rpc_resp       = &res,
2393                 .rpc_cred       = state->owner->so_cred,
2394         };
2395         struct nfs4_lock_state *lsp;
2396         struct nfs_locku_opargs luargs;
2397         int status = 0;
2398
2399         down_read(&clp->cl_sem);
2400         down(&state->lock_sema);
2401         lsp = nfs4_find_lock_state(state, request->fl_owner);
2402         if (!lsp)
2403                 goto out;
2404         /* We might have lost the locks! */
2405         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
2406                 luargs.seqid = lsp->ls_seqid;
2407                 memcpy(&luargs.stateid, &lsp->ls_stateid, sizeof(luargs.stateid));
2408                 arg.u.locku = &luargs;
2409                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2410                 nfs4_increment_lock_seqid(status, lsp);
2411         }
2412
2413         if (status == 0) {
2414                 memcpy(&lsp->ls_stateid,  &res.u.stateid,
2415                                 sizeof(lsp->ls_stateid));
2416                 nfs4_notify_unlck(state, request, lsp);
2417         }
2418         nfs4_put_lock_state(lsp);
2419 out:
2420         up(&state->lock_sema);
2421         if (status == 0)
2422                 posix_lock_file(request->fl_file, request);
2423         up_read(&clp->cl_sem);
2424         return status;
2425 }
2426
2427 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2428 {
2429         struct nfs4_exception exception = { };
2430         int err;
2431
2432         do {
2433                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2434                                 _nfs4_proc_unlck(state, cmd, request),
2435                                 &exception);
2436         } while (exception.retry);
2437         return err;
2438 }
2439
2440 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2441 {
2442         struct inode *inode = state->inode;
2443         struct nfs_server *server = NFS_SERVER(inode);
2444         struct nfs4_lock_state *lsp;
2445         struct nfs_lockargs arg = {
2446                 .fh = NFS_FH(inode),
2447                 .type = nfs4_lck_type(cmd, request),
2448                 .offset = request->fl_start,
2449                 .length = nfs4_lck_length(request),
2450         };
2451         struct nfs_lockres res = {
2452                 .server = server,
2453         };
2454         struct rpc_message msg = {
2455                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2456                 .rpc_argp       = &arg,
2457                 .rpc_resp       = &res,
2458                 .rpc_cred       = state->owner->so_cred,
2459         };
2460         struct nfs_lock_opargs largs = {
2461                 .reclaim = reclaim,
2462                 .new_lock_owner = 0,
2463         };
2464         int status;
2465
2466         lsp = nfs4_get_lock_state(state, request->fl_owner);
2467         if (lsp == NULL)
2468                 return -ENOMEM;
2469         if (!(lsp->ls_flags & NFS_LOCK_INITIALIZED)) {
2470                 struct nfs4_state_owner *owner = state->owner;
2471                 struct nfs_open_to_lock otl = {
2472                         .lock_owner = {
2473                                 .clientid = server->nfs4_state->cl_clientid,
2474                         },
2475                 };
2476
2477                 otl.lock_seqid = lsp->ls_seqid;
2478                 otl.lock_owner.id = lsp->ls_id;
2479                 memcpy(&otl.open_stateid, &state->stateid, sizeof(otl.open_stateid));
2480                 largs.u.open_lock = &otl;
2481                 largs.new_lock_owner = 1;
2482                 arg.u.lock = &largs;
2483                 down(&owner->so_sema);
2484                 otl.open_seqid = owner->so_seqid;
2485                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2486                 /* increment open_owner seqid on success, and
2487                 * seqid mutating errors */
2488                 nfs4_increment_seqid(status, owner);
2489                 up(&owner->so_sema);
2490         } else {
2491                 struct nfs_exist_lock el = {
2492                         .seqid = lsp->ls_seqid,
2493                 };
2494                 memcpy(&el.stateid, &lsp->ls_stateid, sizeof(el.stateid));
2495                 largs.u.exist_lock = &el;
2496                 largs.new_lock_owner = 0;
2497                 arg.u.lock = &largs;
2498                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2499         }
2500         /* increment seqid on success, and * seqid mutating errors*/
2501         nfs4_increment_lock_seqid(status, lsp);
2502         /* save the returned stateid. */
2503         if (status == 0) {
2504                 memcpy(&lsp->ls_stateid, &res.u.stateid, sizeof(nfs4_stateid));
2505                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
2506                 if (!reclaim)
2507                         nfs4_notify_setlk(state, request, lsp);
2508         } else if (status == -NFS4ERR_DENIED)
2509                 status = -EAGAIN;
2510         nfs4_put_lock_state(lsp);
2511         return status;
2512 }
2513
2514 int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
2515 {
2516         return _nfs4_do_setlk(state, F_SETLK, request, 1);
2517 }
2518
2519 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2520 {
2521         struct nfs4_client *clp = state->owner->so_client;
2522         int status;
2523
2524         down_read(&clp->cl_sem);
2525         down(&state->lock_sema);
2526         status = _nfs4_do_setlk(state, cmd, request, 0);
2527         up(&state->lock_sema);
2528         if (status == 0) {
2529                 /* Note: we always want to sleep here! */
2530                 request->fl_flags |= FL_SLEEP;
2531                 if (posix_lock_file_wait(request->fl_file, request) < 0)
2532                         printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
2533         }
2534         up_read(&clp->cl_sem);
2535         return status;
2536 }
2537
2538 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2539 {
2540         struct nfs4_exception exception = { };
2541         int err;
2542
2543         do {
2544                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2545                                 _nfs4_proc_setlk(state, cmd, request),
2546                                 &exception);
2547         } while (exception.retry);
2548         return err;
2549 }
2550
2551 static int
2552 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
2553 {
2554         struct nfs_open_context *ctx;
2555         struct nfs4_state *state;
2556         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
2557         int status;
2558
2559         /* verify open state */
2560         ctx = (struct nfs_open_context *)filp->private_data;
2561         state = ctx->state;
2562
2563         if (request->fl_start < 0 || request->fl_end < 0)
2564                 return -EINVAL;
2565
2566         if (IS_GETLK(cmd))
2567                 return nfs4_proc_getlk(state, F_GETLK, request);
2568
2569         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
2570                 return -EINVAL;
2571
2572         if (request->fl_type == F_UNLCK)
2573                 return nfs4_proc_unlck(state, cmd, request);
2574
2575         do {
2576                 status = nfs4_proc_setlk(state, cmd, request);
2577                 if ((status != -EAGAIN) || IS_SETLK(cmd))
2578                         break;
2579                 timeout = nfs4_set_lock_task_retry(timeout);
2580                 status = -ERESTARTSYS;
2581                 if (signalled())
2582                         break;
2583         } while(status < 0);
2584
2585         return status;
2586 }
2587
2588 struct nfs_rpc_ops      nfs_v4_clientops = {
2589         .version        = 4,                    /* protocol version */
2590         .dentry_ops     = &nfs4_dentry_operations,
2591         .dir_inode_ops  = &nfs4_dir_inode_operations,
2592         .getroot        = nfs4_proc_get_root,
2593         .getattr        = nfs4_proc_getattr,
2594         .setattr        = nfs4_proc_setattr,
2595         .lookup         = nfs4_proc_lookup,
2596         .access         = nfs4_proc_access,
2597         .readlink       = nfs4_proc_readlink,
2598         .read           = nfs4_proc_read,
2599         .write          = nfs4_proc_write,
2600         .commit         = nfs4_proc_commit,
2601         .create         = nfs4_proc_create,
2602         .remove         = nfs4_proc_remove,
2603         .unlink_setup   = nfs4_proc_unlink_setup,
2604         .unlink_done    = nfs4_proc_unlink_done,
2605         .rename         = nfs4_proc_rename,
2606         .link           = nfs4_proc_link,
2607         .symlink        = nfs4_proc_symlink,
2608         .mkdir          = nfs4_proc_mkdir,
2609         .rmdir          = nfs4_proc_remove,
2610         .readdir        = nfs4_proc_readdir,
2611         .mknod          = nfs4_proc_mknod,
2612         .statfs         = nfs4_proc_statfs,
2613         .fsinfo         = nfs4_proc_fsinfo,
2614         .pathconf       = nfs4_proc_pathconf,
2615         .decode_dirent  = nfs4_decode_dirent,
2616         .read_setup     = nfs4_proc_read_setup,
2617         .write_setup    = nfs4_proc_write_setup,
2618         .commit_setup   = nfs4_proc_commit_setup,
2619         .file_open      = nfs4_proc_file_open,
2620         .file_release   = nfs4_proc_file_release,
2621         .lock           = nfs4_proc_lock,
2622 };
2623
2624 /*
2625  * Local variables:
2626  *  c-basic-offset: 8
2627  * End:
2628  */