fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54
  55 #define NFSDBG_FACILITY         NFSDBG_PROC
  56
  57 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  58 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  59
  60 struct nfs4_opendata;
  61 static int _nfs4_proc_open(struct nfs4_opendata *data);
  62 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  63 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  64 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  67 extern struct rpc_procinfo nfs4_procedures[];
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __FUNCTION__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 123                 struct nfs4_readdir_arg *readdir)
 124 {
 125         u32 *start, *p;
 126
 127         BUG_ON(readdir->count < 80);
 128         if (cookie > 2) {
 129                 readdir->cookie = cookie;
 130                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 131                 return;
 132         }
 133
 134         readdir->cookie = 0;
 135         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 136         if (cookie == 2)
 137                 return;
 138
 139         /*
 140          * NFSv4 servers do not return entries for '.' and '..'
 141          * Therefore, we fake these entries here.  We let '.'
 142          * have cookie 0 and '..' have cookie 1.  Note that
 143          * when talking to the server, we always send cookie 0
 144          * instead of 1 or 2.
 145          */
 146         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 147
 148         if (cookie == 0) {
 149                 *p++ = xdr_one;                                  /* next */
 150                 *p++ = xdr_zero;                   /* cookie, first word */
 151                 *p++ = xdr_one;                   /* cookie, second word */
 152                 *p++ = xdr_one;                             /* entry len */
 153                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 154                 p++;
 155                 *p++ = xdr_one;                         /* bitmap length */
 156                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 157                 *p++ = htonl(8);              /* attribute buffer length */
 158                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 159         }
 160
 161         *p++ = xdr_one;                                  /* next */
 162         *p++ = xdr_zero;                   /* cookie, first word */
 163         *p++ = xdr_two;                   /* cookie, second word */
 164         *p++ = xdr_two;                             /* entry len */
 165         memcpy(p, "..\0\0", 4);                         /* entry */
 166         p++;
 167         *p++ = xdr_one;                         /* bitmap length */
 168         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 169         *p++ = htonl(8);              /* attribute buffer length */
 170         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 171
 172         readdir->pgbase = (char *)p - (char *)start;
 173         readdir->count -= readdir->pgbase;
 174         kunmap_atomic(start, KM_USER0);
 175 }
 176
 177 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 178 {
 179         struct nfs4_client *clp = server->nfs4_state;
 180         spin_lock(&clp->cl_lock);
 181         if (time_before(clp->cl_last_renewal,timestamp))
 182                 clp->cl_last_renewal = timestamp;
 183         spin_unlock(&clp->cl_lock);
 184 }
 185
 186 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 187 {
 188         struct nfs_inode *nfsi = NFS_I(inode);
 189
 190         spin_lock(&inode->i_lock);
 191         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 192         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 193                 nfsi->change_attr = cinfo->after;
 194         spin_unlock(&inode->i_lock);
 195 }
 196
 197 struct nfs4_opendata {
 198         atomic_t count;
 199         struct nfs_openargs o_arg;
 200         struct nfs_openres o_res;
 201         struct nfs_open_confirmargs c_arg;
 202         struct nfs_open_confirmres c_res;
 203         struct nfs_fattr f_attr;
 204         struct nfs_fattr dir_attr;
 205         struct dentry *dentry;
 206         struct dentry *dir;
 207         struct nfs4_state_owner *owner;
 208         struct iattr attrs;
 209         unsigned long timestamp;
 210         int rpc_status;
 211         int cancelled;
 212 };
 213
 214 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 215                 struct nfs4_state_owner *sp, int flags,
 216                 const struct iattr *attrs)
 217 {
 218         struct dentry *parent = dget_parent(dentry);
 219         struct inode *dir = parent->d_inode;
 220         struct nfs_server *server = NFS_SERVER(dir);
 221         struct nfs4_opendata *p;
 222
 223         p = kzalloc(sizeof(*p), GFP_KERNEL);
 224         if (p == NULL)
 225                 goto err;
 226         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 227         if (p->o_arg.seqid == NULL)
 228                 goto err_free;
 229         atomic_set(&p->count, 1);
 230         p->dentry = dget(dentry);
 231         p->dir = parent;
 232         p->owner = sp;
 233         atomic_inc(&sp->so_count);
 234         p->o_arg.fh = NFS_FH(dir);
 235         p->o_arg.open_flags = flags,
 236         p->o_arg.clientid = server->nfs4_state->cl_clientid;
 237         p->o_arg.id = sp->so_id;
 238         p->o_arg.name = &dentry->d_name;
 239         p->o_arg.server = server;
 240         p->o_arg.bitmask = server->attr_bitmask;
 241         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 242         p->o_res.f_attr = &p->f_attr;
 243         p->o_res.dir_attr = &p->dir_attr;
 244         p->o_res.server = server;
 245         nfs_fattr_init(&p->f_attr);
 246         nfs_fattr_init(&p->dir_attr);
 247         if (flags & O_EXCL) {
 248                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 249                 s[0] = jiffies;
 250                 s[1] = current->pid;
 251         } else if (flags & O_CREAT) {
 252                 p->o_arg.u.attrs = &p->attrs;
 253                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 254         }
 255         p->c_arg.fh = &p->o_res.fh;
 256         p->c_arg.stateid = &p->o_res.stateid;
 257         p->c_arg.seqid = p->o_arg.seqid;
 258         return p;
 259 err_free:
 260         kfree(p);
 261 err:
 262         dput(parent);
 263         return NULL;
 264 }
 265
 266 static void nfs4_opendata_free(struct nfs4_opendata *p)
 267 {
 268         if (p != NULL && atomic_dec_and_test(&p->count)) {
 269                 nfs_free_seqid(p->o_arg.seqid);
 270                 nfs4_put_state_owner(p->owner);
 271                 dput(p->dir);
 272                 dput(p->dentry);
 273                 kfree(p);
 274         }
 275 }
 276
 277 /* Helper for asynchronous RPC calls */
 278 static int nfs4_call_async(struct rpc_clnt *clnt,
 279                 const struct rpc_call_ops *tk_ops, void *calldata)
 280 {
 281         struct rpc_task *task;
 282
 283         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
 284                 return -ENOMEM;
 285         rpc_execute(task);
 286         return 0;
 287 }
 288
 289 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 290 {
 291         sigset_t oldset;
 292         int ret;
 293
 294         rpc_clnt_sigmask(task->tk_client, &oldset);
 295         ret = rpc_wait_for_completion_task(task);
 296         rpc_clnt_sigunmask(task->tk_client, &oldset);
 297         return ret;
 298 }
 299
 300 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 301 {
 302         switch (open_flags) {
 303                 case FMODE_WRITE:
 304                         state->n_wronly++;
 305                         break;
 306                 case FMODE_READ:
 307                         state->n_rdonly++;
 308                         break;
 309                 case FMODE_READ|FMODE_WRITE:
 310                         state->n_rdwr++;
 311         }
 312 }
 313
 314 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 315 {
 316         struct inode *inode = state->inode;
 317
 318         open_flags &= (FMODE_READ|FMODE_WRITE);
 319         /* Protect against nfs4_find_state_byowner() */
 320         spin_lock(&state->owner->so_lock);
 321         spin_lock(&inode->i_lock);
 322         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 323         update_open_stateflags(state, open_flags);
 324         nfs4_state_set_mode_locked(state, state->state | open_flags);
 325         spin_unlock(&inode->i_lock);
 326         spin_unlock(&state->owner->so_lock);
 327 }
 328
 329 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 330 {
 331         struct inode *inode;
 332         struct nfs4_state *state = NULL;
 333
 334         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 335                 goto out;
 336         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 337         if (inode == NULL)
 338                 goto out;
 339         state = nfs4_get_open_state(inode, data->owner);
 340         if (state == NULL)
 341                 goto put_inode;
 342         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 343 put_inode:
 344         iput(inode);
 345 out:
 346         return state;
 347 }
 348
 349 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 350 {
 351         struct nfs_inode *nfsi = NFS_I(state->inode);
 352         struct nfs_open_context *ctx;
 353
 354         spin_lock(&state->inode->i_lock);
 355         list_for_each_entry(ctx, &nfsi->open_files, list) {
 356                 if (ctx->state != state)
 357                         continue;
 358                 get_nfs_open_context(ctx);
 359                 spin_unlock(&state->inode->i_lock);
 360                 return ctx;
 361         }
 362         spin_unlock(&state->inode->i_lock);
 363         return ERR_PTR(-ENOENT);
 364 }
 365
 366 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
 367 {
 368         int ret;
 369
 370         opendata->o_arg.open_flags = openflags;
 371         ret = _nfs4_proc_open(opendata);
 372         if (ret != 0)
 373                 return ret;
 374         memcpy(stateid->data, opendata->o_res.stateid.data,
 375                         sizeof(stateid->data));
 376         return 0;
 377 }
 378
 379 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 380 {
 381         nfs4_stateid stateid;
 382         struct nfs4_state *newstate;
 383         int mode = 0;
 384         int delegation = 0;
 385         int ret;
 386
 387         /* memory barrier prior to reading state->n_* */
 388         smp_rmb();
 389         if (state->n_rdwr != 0) {
 390                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
 391                 if (ret != 0)
 392                         return ret;
 393                 mode |= FMODE_READ|FMODE_WRITE;
 394                 if (opendata->o_res.delegation_type != 0)
 395                         delegation = opendata->o_res.delegation_type;
 396                 smp_rmb();
 397         }
 398         if (state->n_wronly != 0) {
 399                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
 400                 if (ret != 0)
 401                         return ret;
 402                 mode |= FMODE_WRITE;
 403                 if (opendata->o_res.delegation_type != 0)
 404                         delegation = opendata->o_res.delegation_type;
 405                 smp_rmb();
 406         }
 407         if (state->n_rdonly != 0) {
 408                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
 409                 if (ret != 0)
 410                         return ret;
 411                 mode |= FMODE_READ;
 412         }
 413         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 414         if (mode == 0)
 415                 return 0;
 416         if (opendata->o_res.delegation_type == 0)
 417                 opendata->o_res.delegation_type = delegation;
 418         opendata->o_arg.open_flags |= mode;
 419         newstate = nfs4_opendata_to_nfs4_state(opendata);
 420         if (newstate != NULL) {
 421                 if (opendata->o_res.delegation_type != 0) {
 422                         struct nfs_inode *nfsi = NFS_I(newstate->inode);
 423                         int delegation_flags = 0;
 424                         if (nfsi->delegation)
 425                                 delegation_flags = nfsi->delegation->flags;
 426                         if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 427                                 nfs_inode_set_delegation(newstate->inode,
 428                                                 opendata->owner->so_cred,
 429                                                 &opendata->o_res);
 430                         else
 431                                 nfs_inode_reclaim_delegation(newstate->inode,
 432                                                 opendata->owner->so_cred,
 433                                                 &opendata->o_res);
 434                 }
 435                 nfs4_close_state(newstate, opendata->o_arg.open_flags);
 436         }
 437         if (newstate != state)
 438                 return -ESTALE;
 439         return 0;
 440 }
 441
 442 /*
 443  * OPEN_RECLAIM:
 444  *      reclaim state on the server after a reboot.
 445  */
 446 static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 447 {
 448         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
 449         struct nfs4_opendata *opendata;
 450         int delegation_type = 0;
 451         int status;
 452
 453         if (delegation != NULL) {
 454                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 455                         memcpy(&state->stateid, &delegation->stateid,
 456                                         sizeof(state->stateid));
 457                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 458                         return 0;
 459                 }
 460                 delegation_type = delegation->type;
 461         }
 462         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 463         if (opendata == NULL)
 464                 return -ENOMEM;
 465         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 466         opendata->o_arg.fh = NFS_FH(state->inode);
 467         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 468         opendata->o_arg.u.delegation_type = delegation_type;
 469         status = nfs4_open_recover(opendata, state);
 470         nfs4_opendata_free(opendata);
 471         return status;
 472 }
 473
 474 static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 475 {
 476         struct nfs_server *server = NFS_SERVER(state->inode);
 477         struct nfs4_exception exception = { };
 478         int err;
 479         do {
 480                 err = _nfs4_do_open_reclaim(sp, state, dentry);
 481                 if (err != -NFS4ERR_DELAY)
 482                         break;
 483                 nfs4_handle_exception(server, err, &exception);
 484         } while (exception.retry);
 485         return err;
 486 }
 487
 488 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 489 {
 490         struct nfs_open_context *ctx;
 491         int ret;
 492
 493         ctx = nfs4_state_find_open_context(state);
 494         if (IS_ERR(ctx))
 495                 return PTR_ERR(ctx);
 496         ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
 497         put_nfs_open_context(ctx);
 498         return ret;
 499 }
 500
 501 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 502 {
 503         struct nfs4_state_owner  *sp  = state->owner;
 504         struct nfs4_opendata *opendata;
 505         int ret;
 506
 507         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 508                 return 0;
 509         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 510         if (opendata == NULL)
 511                 return -ENOMEM;
 512         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 513         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 514                         sizeof(opendata->o_arg.u.delegation.data));
 515         ret = nfs4_open_recover(opendata, state);
 516         nfs4_opendata_free(opendata);
 517         return ret;
 518 }
 519
 520 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 521 {
 522         struct nfs4_exception exception = { };
 523         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 524         int err;
 525         do {
 526                 err = _nfs4_open_delegation_recall(dentry, state);
 527                 switch (err) {
 528                         case 0:
 529                                 return err;
 530                         case -NFS4ERR_STALE_CLIENTID:
 531                         case -NFS4ERR_STALE_STATEID:
 532                         case -NFS4ERR_EXPIRED:
 533                                 /* Don't recall a delegation if it was lost */
 534                                 nfs4_schedule_state_recovery(server->nfs4_state);
 535                                 return err;
 536                 }
 537                 err = nfs4_handle_exception(server, err, &exception);
 538         } while (exception.retry);
 539         return err;
 540 }
 541
 542 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 543 {
 544         struct nfs4_opendata *data = calldata;
 545         struct  rpc_message msg = {
 546                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 547                 .rpc_argp = &data->c_arg,
 548                 .rpc_resp = &data->c_res,
 549                 .rpc_cred = data->owner->so_cred,
 550         };
 551         data->timestamp = jiffies;
 552         rpc_call_setup(task, &msg, 0);
 553 }
 554
 555 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 556 {
 557         struct nfs4_opendata *data = calldata;
 558
 559         data->rpc_status = task->tk_status;
 560         if (RPC_ASSASSINATED(task))
 561                 return;
 562         if (data->rpc_status == 0) {
 563                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 564                                 sizeof(data->o_res.stateid.data));
 565                 renew_lease(data->o_res.server, data->timestamp);
 566         }
 567         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 568         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 569 }
 570
 571 static void nfs4_open_confirm_release(void *calldata)
 572 {
 573         struct nfs4_opendata *data = calldata;
 574         struct nfs4_state *state = NULL;
 575
 576         /* If this request hasn't been cancelled, do nothing */
 577         if (data->cancelled == 0)
 578                 goto out_free;
 579         /* In case of error, no cleanup! */
 580         if (data->rpc_status != 0)
 581                 goto out_free;
 582         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 583         state = nfs4_opendata_to_nfs4_state(data);
 584         if (state != NULL)
 585                 nfs4_close_state(state, data->o_arg.open_flags);
 586 out_free:
 587         nfs4_opendata_free(data);
 588 }
 589
 590 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 591         .rpc_call_prepare = nfs4_open_confirm_prepare,
 592         .rpc_call_done = nfs4_open_confirm_done,
 593         .rpc_release = nfs4_open_confirm_release,
 594 };
 595
 596 /*
 597  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 598  */
 599 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 600 {
 601         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 602         struct rpc_task *task;
 603         int status;
 604
 605         atomic_inc(&data->count);
 606         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 607         if (IS_ERR(task)) {
 608                 nfs4_opendata_free(data);
 609                 return PTR_ERR(task);
 610         }
 611         status = nfs4_wait_for_completion_rpc_task(task);
 612         if (status != 0) {
 613                 data->cancelled = 1;
 614                 smp_wmb();
 615         } else
 616                 status = data->rpc_status;
 617         rpc_release_task(task);
 618         return status;
 619 }
 620
 621 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 622 {
 623         struct nfs4_opendata *data = calldata;
 624         struct nfs4_state_owner *sp = data->owner;
 625         struct rpc_message msg = {
 626                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 627                 .rpc_argp = &data->o_arg,
 628                 .rpc_resp = &data->o_res,
 629                 .rpc_cred = sp->so_cred,
 630         };
 631
 632         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 633                 return;
 634         /* Update sequence id. */
 635         data->o_arg.id = sp->so_id;
 636         data->o_arg.clientid = sp->so_client->cl_clientid;
 637         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 638                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 639         data->timestamp = jiffies;
 640         rpc_call_setup(task, &msg, 0);
 641 }
 642
 643 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 644 {
 645         struct nfs4_opendata *data = calldata;
 646
 647         data->rpc_status = task->tk_status;
 648         if (RPC_ASSASSINATED(task))
 649                 return;
 650         if (task->tk_status == 0) {
 651                 switch (data->o_res.f_attr->mode & S_IFMT) {
 652                         case S_IFREG:
 653                                 break;
 654                         case S_IFLNK:
 655                                 data->rpc_status = -ELOOP;
 656                                 break;
 657                         case S_IFDIR:
 658                                 data->rpc_status = -EISDIR;
 659                                 break;
 660                         default:
 661                                 data->rpc_status = -ENOTDIR;
 662                 }
 663                 renew_lease(data->o_res.server, data->timestamp);
 664         }
 665         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 666 }
 667
 668 static void nfs4_open_release(void *calldata)
 669 {
 670         struct nfs4_opendata *data = calldata;
 671         struct nfs4_state *state = NULL;
 672
 673         /* If this request hasn't been cancelled, do nothing */
 674         if (data->cancelled == 0)
 675                 goto out_free;
 676         /* In case of error, no cleanup! */
 677         if (data->rpc_status != 0)
 678                 goto out_free;
 679         /* In case we need an open_confirm, no cleanup! */
 680         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 681                 goto out_free;
 682         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 683         state = nfs4_opendata_to_nfs4_state(data);
 684         if (state != NULL)
 685                 nfs4_close_state(state, data->o_arg.open_flags);
 686 out_free:
 687         nfs4_opendata_free(data);
 688 }
 689
 690 static const struct rpc_call_ops nfs4_open_ops = {
 691         .rpc_call_prepare = nfs4_open_prepare,
 692         .rpc_call_done = nfs4_open_done,
 693         .rpc_release = nfs4_open_release,
 694 };
 695
 696 /*
 697  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 698  */
 699 static int _nfs4_proc_open(struct nfs4_opendata *data)
 700 {
 701         struct inode *dir = data->dir->d_inode;
 702         struct nfs_server *server = NFS_SERVER(dir);
 703         struct nfs_openargs *o_arg = &data->o_arg;
 704         struct nfs_openres *o_res = &data->o_res;
 705         struct rpc_task *task;
 706         int status;
 707
 708         atomic_inc(&data->count);
 709         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 710         if (IS_ERR(task)) {
 711                 nfs4_opendata_free(data);
 712                 return PTR_ERR(task);
 713         }
 714         status = nfs4_wait_for_completion_rpc_task(task);
 715         if (status != 0) {
 716                 data->cancelled = 1;
 717                 smp_wmb();
 718         } else
 719                 status = data->rpc_status;
 720         rpc_release_task(task);
 721         if (status != 0)
 722                 return status;
 723
 724         if (o_arg->open_flags & O_CREAT) {
 725                 update_changeattr(dir, &o_res->cinfo);
 726                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 727         } else
 728                 nfs_refresh_inode(dir, o_res->dir_attr);
 729         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 730                 status = _nfs4_proc_open_confirm(data);
 731                 if (status != 0)
 732                         return status;
 733         }
 734         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 735         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 736                 return server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 737         return 0;
 738 }
 739
 740 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 741 {
 742         struct nfs_access_entry cache;
 743         int mask = 0;
 744         int status;
 745
 746         if (openflags & FMODE_READ)
 747                 mask |= MAY_READ;
 748         if (openflags & FMODE_WRITE)
 749                 mask |= MAY_WRITE;
 750         status = nfs_access_get_cached(inode, cred, &cache);
 751         if (status == 0)
 752                 goto out;
 753
 754         /* Be clever: ask server to check for all possible rights */
 755         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 756         cache.cred = cred;
 757         cache.jiffies = jiffies;
 758         status = _nfs4_proc_access(inode, &cache);
 759         if (status != 0)
 760                 return status;
 761         nfs_access_add_cache(inode, &cache);
 762 out:
 763         if ((cache.mask & mask) == mask)
 764                 return 0;
 765         return -EACCES;
 766 }
 767
 768 /*
 769  * OPEN_EXPIRED:
 770  *      reclaim state on the server after a network partition.
 771  *      Assumes caller holds the appropriate lock
 772  */
 773 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 774 {
 775         struct inode *inode = state->inode;
 776         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 777         struct nfs4_opendata *opendata;
 778         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 779         int ret;
 780
 781         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 782                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
 783                 if (ret < 0)
 784                         return ret;
 785                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 786                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 787                 return 0;
 788         }
 789         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 790         if (opendata == NULL)
 791                 return -ENOMEM;
 792         ret = nfs4_open_recover(opendata, state);
 793         if (ret == -ESTALE) {
 794                 /* Invalidate the state owner so we don't ever use it again */
 795                 nfs4_drop_state_owner(sp);
 796                 d_drop(dentry);
 797         }
 798         nfs4_opendata_free(opendata);
 799         return ret;
 800 }
 801
 802 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 803 {
 804         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 805         struct nfs4_exception exception = { };
 806         int err;
 807
 808         do {
 809                 err = _nfs4_open_expired(sp, state, dentry);
 810                 if (err == -NFS4ERR_DELAY)
 811                         nfs4_handle_exception(server, err, &exception);
 812         } while (exception.retry);
 813         return err;
 814 }
 815
 816 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 817 {
 818         struct nfs_open_context *ctx;
 819         int ret;
 820
 821         ctx = nfs4_state_find_open_context(state);
 822         if (IS_ERR(ctx))
 823                 return PTR_ERR(ctx);
 824         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
 825         put_nfs_open_context(ctx);
 826         return ret;
 827 }
 828
 829 /*
 830  * Returns a referenced nfs4_state if there is an open delegation on the file
 831  */
 832 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 833 {
 834         struct nfs_delegation *delegation;
 835         struct nfs_server *server = NFS_SERVER(inode);
 836         struct nfs4_client *clp = server->nfs4_state;
 837         struct nfs_inode *nfsi = NFS_I(inode);
 838         struct nfs4_state_owner *sp = NULL;
 839         struct nfs4_state *state = NULL;
 840         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 841         int err;
 842
 843         /* Protect against reboot recovery - NOTE ORDER! */
 844         down_read(&clp->cl_sem);
 845         /* Protect against delegation recall */
 846         down_read(&nfsi->rwsem);
 847         delegation = NFS_I(inode)->delegation;
 848         err = -ENOENT;
 849         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 850                 goto out_err;
 851         err = -ENOMEM;
 852         if (!(sp = nfs4_get_state_owner(server, cred))) {
 853                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 854                 goto out_err;
 855         }
 856         state = nfs4_get_open_state(inode, sp);
 857         if (state == NULL)
 858                 goto out_err;
 859
 860         err = -ENOENT;
 861         if ((state->state & open_flags) == open_flags) {
 862                 spin_lock(&inode->i_lock);
 863                 update_open_stateflags(state, open_flags);
 864                 spin_unlock(&inode->i_lock);
 865                 goto out_ok;
 866         } else if (state->state != 0)
 867                 goto out_err;
 868
 869         lock_kernel();
 870         err = _nfs4_do_access(inode, cred, open_flags);
 871         unlock_kernel();
 872         if (err != 0)
 873                 goto out_err;
 874         set_bit(NFS_DELEGATED_STATE, &state->flags);
 875         update_open_stateid(state, &delegation->stateid, open_flags);
 876 out_ok:
 877         nfs4_put_state_owner(sp);
 878         up_read(&nfsi->rwsem);
 879         up_read(&clp->cl_sem);
 880         *res = state;
 881         return 0;
 882 out_err:
 883         if (sp != NULL) {
 884                 if (state != NULL)
 885                         nfs4_put_open_state(state);
 886                 nfs4_put_state_owner(sp);
 887         }
 888         up_read(&nfsi->rwsem);
 889         up_read(&clp->cl_sem);
 890         if (err != -EACCES)
 891                 nfs_inode_return_delegation(inode);
 892         return err;
 893 }
 894
 895 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 896 {
 897         struct nfs4_exception exception = { };
 898         struct nfs4_state *res;
 899         int err;
 900
 901         do {
 902                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 903                 if (err == 0)
 904                         break;
 905                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 906                                         err, &exception));
 907         } while (exception.retry);
 908         return res;
 909 }
 910
 911 /*
 912  * Returns a referenced nfs4_state
 913  */
 914 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 915 {
 916         struct nfs4_state_owner  *sp;
 917         struct nfs4_state     *state = NULL;
 918         struct nfs_server       *server = NFS_SERVER(dir);
 919         struct nfs4_client *clp = server->nfs4_state;
 920         struct nfs4_opendata *opendata;
 921         int                     status;
 922
 923         /* Protect against reboot recovery conflicts */
 924         down_read(&clp->cl_sem);
 925         status = -ENOMEM;
 926         if (!(sp = nfs4_get_state_owner(server, cred))) {
 927                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 928                 goto out_err;
 929         }
 930         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 931         if (opendata == NULL)
 932                 goto err_put_state_owner;
 933
 934         status = _nfs4_proc_open(opendata);
 935         if (status != 0)
 936                 goto err_opendata_free;
 937
 938         status = -ENOMEM;
 939         state = nfs4_opendata_to_nfs4_state(opendata);
 940         if (state == NULL)
 941                 goto err_opendata_free;
 942         if (opendata->o_res.delegation_type != 0)
 943                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 944         nfs4_opendata_free(opendata);
 945         nfs4_put_state_owner(sp);
 946         up_read(&clp->cl_sem);
 947         *res = state;
 948         return 0;
 949 err_opendata_free:
 950         nfs4_opendata_free(opendata);
 951 err_put_state_owner:
 952         nfs4_put_state_owner(sp);
 953 out_err:
 954         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 955         up_read(&clp->cl_sem);
 956         *res = NULL;
 957         return status;
 958 }
 959
 960
 961 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 962 {
 963         struct nfs4_exception exception = { };
 964         struct nfs4_state *res;
 965         int status;
 966
 967         do {
 968                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 969                 if (status == 0)
 970                         break;
 971                 /* NOTE: BAD_SEQID means the server and client disagree about the
 972                  * book-keeping w.r.t. state-changing operations
 973                  * (OPEN/CLOSE/LOCK/LOCKU...)
 974                  * It is actually a sign of a bug on the client or on the server.
 975                  *
 976                  * If we receive a BAD_SEQID error in the particular case of
 977                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 978                  * have unhashed the old state_owner for us, and that we can
 979                  * therefore safely retry using a new one. We should still warn
 980                  * the user though...
 981                  */
 982                 if (status == -NFS4ERR_BAD_SEQID) {
 983                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 984                         exception.retry = 1;
 985                         continue;
 986                 }
 987                 /*
 988                  * BAD_STATEID on OPEN means that the server cancelled our
 989                  * state before it received the OPEN_CONFIRM.
 990                  * Recover by retrying the request as per the discussion
 991                  * on Page 181 of RFC3530.
 992                  */
 993                 if (status == -NFS4ERR_BAD_STATEID) {
 994                         exception.retry = 1;
 995                         continue;
 996                 }
 997                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 998                                         status, &exception));
 999         } while (exception.retry);
1000         return res;
1001 }
1002
1003 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
1004                 struct nfs_fh *fhandle, struct iattr *sattr,
1005                 struct nfs4_state *state)
1006 {
1007         struct nfs_setattrargs  arg = {
1008                 .fh             = fhandle,
1009                 .iap            = sattr,
1010                 .server         = server,
1011                 .bitmask = server->attr_bitmask,
1012         };
1013         struct nfs_setattrres  res = {
1014                 .fattr          = fattr,
1015                 .server         = server,
1016         };
1017         struct rpc_message msg = {
1018                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1019                 .rpc_argp       = &arg,
1020                 .rpc_resp       = &res,
1021         };
1022         unsigned long timestamp = jiffies;
1023         int status;
1024
1025         nfs_fattr_init(fattr);
1026
1027         if (state != NULL) {
1028                 msg.rpc_cred = state->owner->so_cred;
1029                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1030         } else
1031                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1032
1033         status = rpc_call_sync(server->client, &msg, 0);
1034         if (status == 0 && state != NULL)
1035                 renew_lease(server, timestamp);
1036         return status;
1037 }
1038
1039 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
1040                 struct nfs_fh *fhandle, struct iattr *sattr,
1041                 struct nfs4_state *state)
1042 {
1043         struct nfs4_exception exception = { };
1044         int err;
1045         do {
1046                 err = nfs4_handle_exception(server,
1047                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
1048                                         state),
1049                                 &exception);
1050         } while (exception.retry);
1051         return err;
1052 }
1053
1054 struct nfs4_closedata {
1055         struct inode *inode;
1056         struct nfs4_state *state;
1057         struct nfs_closeargs arg;
1058         struct nfs_closeres res;
1059         struct nfs_fattr fattr;
1060         unsigned long timestamp;
1061 };
1062
1063 static void nfs4_free_closedata(void *data)
1064 {
1065         struct nfs4_closedata *calldata = data;
1066         struct nfs4_state_owner *sp = calldata->state->owner;
1067
1068         nfs4_put_open_state(calldata->state);
1069         nfs_free_seqid(calldata->arg.seqid);
1070         nfs4_put_state_owner(sp);
1071         kfree(calldata);
1072 }
1073
1074 static void nfs4_close_done(struct rpc_task *task, void *data)
1075 {
1076         struct nfs4_closedata *calldata = data;
1077         struct nfs4_state *state = calldata->state;
1078         struct nfs_server *server = NFS_SERVER(calldata->inode);
1079
1080         if (RPC_ASSASSINATED(task))
1081                 return;
1082         /* hmm. we are done with the inode, and in the process of freeing
1083          * the state_owner. we keep this around to process errors
1084          */
1085         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1086         switch (task->tk_status) {
1087                 case 0:
1088                         memcpy(&state->stateid, &calldata->res.stateid,
1089                                         sizeof(state->stateid));
1090                         renew_lease(server, calldata->timestamp);
1091                         break;
1092                 case -NFS4ERR_STALE_STATEID:
1093                 case -NFS4ERR_EXPIRED:
1094                         nfs4_schedule_state_recovery(server->nfs4_state);
1095                         break;
1096                 default:
1097                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1098                                 rpc_restart_call(task);
1099                                 return;
1100                         }
1101         }
1102         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1103 }
1104
1105 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1106 {
1107         struct nfs4_closedata *calldata = data;
1108         struct nfs4_state *state = calldata->state;
1109         struct rpc_message msg = {
1110                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1111                 .rpc_argp = &calldata->arg,
1112                 .rpc_resp = &calldata->res,
1113                 .rpc_cred = state->owner->so_cred,
1114         };
1115         int mode = 0, old_mode;
1116
1117         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1118                 return;
1119         /* Recalculate the new open mode in case someone reopened the file
1120          * while we were waiting in line to be scheduled.
1121          */
1122         spin_lock(&state->owner->so_lock);
1123         spin_lock(&calldata->inode->i_lock);
1124         mode = old_mode = state->state;
1125         if (state->n_rdwr == 0) {
1126                 if (state->n_rdonly == 0)
1127                         mode &= ~FMODE_READ;
1128                 if (state->n_wronly == 0)
1129                         mode &= ~FMODE_WRITE;
1130         }
1131         nfs4_state_set_mode_locked(state, mode);
1132         spin_unlock(&calldata->inode->i_lock);
1133         spin_unlock(&state->owner->so_lock);
1134         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1135                 /* Note: exit _without_ calling nfs4_close_done */
1136                 task->tk_action = NULL;
1137                 return;
1138         }
1139         nfs_fattr_init(calldata->res.fattr);
1140         if (mode != 0)
1141                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1142         calldata->arg.open_flags = mode;
1143         calldata->timestamp = jiffies;
1144         rpc_call_setup(task, &msg, 0);
1145 }
1146
1147 static const struct rpc_call_ops nfs4_close_ops = {
1148         .rpc_call_prepare = nfs4_close_prepare,
1149         .rpc_call_done = nfs4_close_done,
1150         .rpc_release = nfs4_free_closedata,
1151 };
1152
1153 /*
1154  * It is possible for data to be read/written from a mem-mapped file
1155  * after the sys_close call (which hits the vfs layer as a flush).
1156  * This means that we can't safely call nfsv4 close on a file until
1157  * the inode is cleared. This in turn means that we are not good
1158  * NFSv4 citizens - we do not indicate to the server to update the file's
1159  * share state even when we are done with one of the three share
1160  * stateid's in the inode.
1161  *
1162  * NOTE: Caller must be holding the sp->so_owner semaphore!
1163  */
1164 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1165 {
1166         struct nfs_server *server = NFS_SERVER(inode);
1167         struct nfs4_closedata *calldata;
1168         int status = -ENOMEM;
1169
1170         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1171         if (calldata == NULL)
1172                 goto out;
1173         calldata->inode = inode;
1174         calldata->state = state;
1175         calldata->arg.fh = NFS_FH(inode);
1176         calldata->arg.stateid = &state->stateid;
1177         /* Serialization for the sequence id */
1178         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1179         if (calldata->arg.seqid == NULL)
1180                 goto out_free_calldata;
1181         calldata->arg.bitmask = server->attr_bitmask;
1182         calldata->res.fattr = &calldata->fattr;
1183         calldata->res.server = server;
1184
1185         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1186         if (status == 0)
1187                 goto out;
1188
1189         nfs_free_seqid(calldata->arg.seqid);
1190 out_free_calldata:
1191         kfree(calldata);
1192 out:
1193         return status;
1194 }
1195
1196 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1197 {
1198         struct file *filp;
1199
1200         filp = lookup_instantiate_filp(nd, dentry, NULL);
1201         if (!IS_ERR(filp)) {
1202                 struct nfs_open_context *ctx;
1203                 ctx = (struct nfs_open_context *)filp->private_data;
1204                 ctx->state = state;
1205         } else
1206                 nfs4_close_state(state, nd->intent.open.flags);
1207 }
1208
1209 struct dentry *
1210 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1211 {
1212         struct iattr attr;
1213         struct rpc_cred *cred;
1214         struct nfs4_state *state;
1215         struct dentry *res;
1216
1217         if (nd->flags & LOOKUP_CREATE) {
1218                 attr.ia_mode = nd->intent.open.create_mode;
1219                 attr.ia_valid = ATTR_MODE;
1220                 if (!IS_POSIXACL(dir))
1221                         attr.ia_mode &= ~current->fs->umask;
1222         } else {
1223                 attr.ia_valid = 0;
1224                 BUG_ON(nd->intent.open.flags & O_CREAT);
1225         }
1226
1227         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1228         if (IS_ERR(cred))
1229                 return (struct dentry *)cred;
1230         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1231         put_rpccred(cred);
1232         if (IS_ERR(state)) {
1233                 if (PTR_ERR(state) == -ENOENT)
1234                         d_add(dentry, NULL);
1235                 return (struct dentry *)state;
1236         }
1237         res = d_add_unique(dentry, igrab(state->inode));
1238         if (res != NULL)
1239                 dentry = res;
1240         nfs4_intent_set_file(nd, dentry, state);
1241         return res;
1242 }
1243
1244 int
1245 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1246 {
1247         struct rpc_cred *cred;
1248         struct nfs4_state *state;
1249
1250         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1251         if (IS_ERR(cred))
1252                 return PTR_ERR(cred);
1253         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1254         if (IS_ERR(state))
1255                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1256         put_rpccred(cred);
1257         if (IS_ERR(state)) {
1258                 switch (PTR_ERR(state)) {
1259                         case -EPERM:
1260                         case -EACCES:
1261                         case -EDQUOT:
1262                         case -ENOSPC:
1263                         case -EROFS:
1264                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1265                                 return 1;
1266                         case -ENOENT:
1267                                 if (dentry->d_inode == NULL)
1268                                         return 1;
1269                 }
1270                 goto out_drop;
1271         }
1272         if (state->inode == dentry->d_inode) {
1273                 nfs4_intent_set_file(nd, dentry, state);
1274                 return 1;
1275         }
1276         nfs4_close_state(state, openflags);
1277 out_drop:
1278         d_drop(dentry);
1279         return 0;
1280 }
1281
1282
1283 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1284 {
1285         struct nfs4_server_caps_res res = {};
1286         struct rpc_message msg = {
1287                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1288                 .rpc_argp = fhandle,
1289                 .rpc_resp = &res,
1290         };
1291         int status;
1292
1293         status = rpc_call_sync(server->client, &msg, 0);
1294         if (status == 0) {
1295                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1296                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1297                         server->caps |= NFS_CAP_ACLS;
1298                 if (res.has_links != 0)
1299                         server->caps |= NFS_CAP_HARDLINKS;
1300                 if (res.has_symlinks != 0)
1301                         server->caps |= NFS_CAP_SYMLINKS;
1302                 server->acl_bitmask = res.acl_bitmask;
1303         }
1304         return status;
1305 }
1306
1307 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1308 {
1309         struct nfs4_exception exception = { };
1310         int err;
1311         do {
1312                 err = nfs4_handle_exception(server,
1313                                 _nfs4_server_capabilities(server, fhandle),
1314                                 &exception);
1315         } while (exception.retry);
1316         return err;
1317 }
1318
1319 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1320                 struct nfs_fsinfo *info)
1321 {
1322         struct nfs4_lookup_root_arg args = {
1323                 .bitmask = nfs4_fattr_bitmap,
1324         };
1325         struct nfs4_lookup_res res = {
1326                 .server = server,
1327                 .fattr = info->fattr,
1328                 .fh = fhandle,
1329         };
1330         struct rpc_message msg = {
1331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1332                 .rpc_argp = &args,
1333                 .rpc_resp = &res,
1334         };
1335         nfs_fattr_init(info->fattr);
1336         return rpc_call_sync(server->client, &msg, 0);
1337 }
1338
1339 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1340                 struct nfs_fsinfo *info)
1341 {
1342         struct nfs4_exception exception = { };
1343         int err;
1344         do {
1345                 err = nfs4_handle_exception(server,
1346                                 _nfs4_lookup_root(server, fhandle, info),
1347                                 &exception);
1348         } while (exception.retry);
1349         return err;
1350 }
1351
1352 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1353                 struct nfs_fsinfo *info)
1354 {
1355         struct nfs_fattr *      fattr = info->fattr;
1356         unsigned char *         p;
1357         struct qstr             q;
1358         struct nfs4_lookup_arg args = {
1359                 .dir_fh = fhandle,
1360                 .name = &q,
1361                 .bitmask = nfs4_fattr_bitmap,
1362         };
1363         struct nfs4_lookup_res res = {
1364                 .server = server,
1365                 .fattr = fattr,
1366                 .fh = fhandle,
1367         };
1368         struct rpc_message msg = {
1369                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1370                 .rpc_argp = &args,
1371                 .rpc_resp = &res,
1372         };
1373         int status;
1374
1375         /*
1376          * Now we do a separate LOOKUP for each component of the mount path.
1377          * The LOOKUPs are done separately so that we can conveniently
1378          * catch an ERR_WRONGSEC if it occurs along the way...
1379          */
1380         status = nfs4_lookup_root(server, fhandle, info);
1381         if (status)
1382                 goto out;
1383
1384         p = server->mnt_path;
1385         for (;;) {
1386                 struct nfs4_exception exception = { };
1387
1388                 while (*p == '/')
1389                         p++;
1390                 if (!*p)
1391                         break;
1392                 q.name = p;
1393                 while (*p && (*p != '/'))
1394                         p++;
1395                 q.len = p - q.name;
1396
1397                 do {
1398                         nfs_fattr_init(fattr);
1399                         status = nfs4_handle_exception(server,
1400                                         rpc_call_sync(server->client, &msg, 0),
1401                                         &exception);
1402                 } while (exception.retry);
1403                 if (status == 0)
1404                         continue;
1405                 if (status == -ENOENT) {
1406                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1407                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1408                 }
1409                 break;
1410         }
1411         if (status == 0)
1412                 status = nfs4_server_capabilities(server, fhandle);
1413         if (status == 0)
1414                 status = nfs4_do_fsinfo(server, fhandle, info);
1415 out:
1416         return status;
1417 }
1418
1419 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1420 {
1421         struct nfs4_getattr_arg args = {
1422                 .fh = fhandle,
1423                 .bitmask = server->attr_bitmask,
1424         };
1425         struct nfs4_getattr_res res = {
1426                 .fattr = fattr,
1427                 .server = server,
1428         };
1429         struct rpc_message msg = {
1430                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1431                 .rpc_argp = &args,
1432                 .rpc_resp = &res,
1433         };
1434
1435         nfs_fattr_init(fattr);
1436         return rpc_call_sync(server->client, &msg, 0);
1437 }
1438
1439 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1440 {
1441         struct nfs4_exception exception = { };
1442         int err;
1443         do {
1444                 err = nfs4_handle_exception(server,
1445                                 _nfs4_proc_getattr(server, fhandle, fattr),
1446                                 &exception);
1447         } while (exception.retry);
1448         return err;
1449 }
1450
1451 /*
1452  * The file is not closed if it is opened due to the a request to change
1453  * the size of the file. The open call will not be needed once the
1454  * VFS layer lookup-intents are implemented.
1455  *
1456  * Close is called when the inode is destroyed.
1457  * If we haven't opened the file for O_WRONLY, we
1458  * need to in the size_change case to obtain a stateid.
1459  *
1460  * Got race?
1461  * Because OPEN is always done by name in nfsv4, it is
1462  * possible that we opened a different file by the same
1463  * name.  We can recognize this race condition, but we
1464  * can't do anything about it besides returning an error.
1465  *
1466  * This will be fixed with VFS changes (lookup-intent).
1467  */
1468 static int
1469 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1470                   struct iattr *sattr)
1471 {
1472         struct rpc_cred *cred;
1473         struct inode *inode = dentry->d_inode;
1474         struct nfs_open_context *ctx;
1475         struct nfs4_state *state = NULL;
1476         int status;
1477
1478         nfs_fattr_init(fattr);
1479
1480         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1481         if (IS_ERR(cred))
1482                 return PTR_ERR(cred);
1483
1484         /* Search for an existing open(O_WRITE) file */
1485         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1486         if (ctx != NULL)
1487                 state = ctx->state;
1488
1489         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1490                         NFS_FH(inode), sattr, state);
1491         if (status == 0)
1492                 nfs_setattr_update_inode(inode, sattr);
1493         if (ctx != NULL)
1494                 put_nfs_open_context(ctx);
1495         put_rpccred(cred);
1496         return status;
1497 }
1498
1499 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1500                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1501 {
1502         int                    status;
1503         struct nfs_server *server = NFS_SERVER(dir);
1504         struct nfs4_lookup_arg args = {
1505                 .bitmask = server->attr_bitmask,
1506                 .dir_fh = NFS_FH(dir),
1507                 .name = name,
1508         };
1509         struct nfs4_lookup_res res = {
1510                 .server = server,
1511                 .fattr = fattr,
1512                 .fh = fhandle,
1513         };
1514         struct rpc_message msg = {
1515                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1516                 .rpc_argp = &args,
1517                 .rpc_resp = &res,
1518         };
1519
1520         nfs_fattr_init(fattr);
1521
1522         dprintk("NFS call  lookup %s\n", name->name);
1523         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1524         dprintk("NFS reply lookup: %d\n", status);
1525         return status;
1526 }
1527
1528 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1529 {
1530         struct nfs4_exception exception = { };
1531         int err;
1532         do {
1533                 err = nfs4_handle_exception(NFS_SERVER(dir),
1534                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1535                                 &exception);
1536         } while (exception.retry);
1537         return err;
1538 }
1539
1540 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1541 {
1542         struct nfs4_accessargs args = {
1543                 .fh = NFS_FH(inode),
1544         };
1545         struct nfs4_accessres res = { 0 };
1546         struct rpc_message msg = {
1547                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1548                 .rpc_argp = &args,
1549                 .rpc_resp = &res,
1550                 .rpc_cred = entry->cred,
1551         };
1552         int mode = entry->mask;
1553         int status;
1554
1555         /*
1556          * Determine which access bits we want to ask for...
1557          */
1558         if (mode & MAY_READ)
1559                 args.access |= NFS4_ACCESS_READ;
1560         if (S_ISDIR(inode->i_mode)) {
1561                 if (mode & MAY_WRITE)
1562                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1563                 if (mode & MAY_EXEC)
1564                         args.access |= NFS4_ACCESS_LOOKUP;
1565         } else {
1566                 if (mode & MAY_WRITE)
1567                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1568                 if (mode & MAY_EXEC)
1569                         args.access |= NFS4_ACCESS_EXECUTE;
1570         }
1571         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1572         if (!status) {
1573                 entry->mask = 0;
1574                 if (res.access & NFS4_ACCESS_READ)
1575                         entry->mask |= MAY_READ;
1576                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1577                         entry->mask |= MAY_WRITE;
1578                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1579                         entry->mask |= MAY_EXEC;
1580         }
1581         return status;
1582 }
1583
1584 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1585 {
1586         struct nfs4_exception exception = { };
1587         int err;
1588         do {
1589                 err = nfs4_handle_exception(NFS_SERVER(inode),
1590                                 _nfs4_proc_access(inode, entry),
1591                                 &exception);
1592         } while (exception.retry);
1593         return err;
1594 }
1595
1596 /*
1597  * TODO: For the time being, we don't try to get any attributes
1598  * along with any of the zero-copy operations READ, READDIR,
1599  * READLINK, WRITE.
1600  *
1601  * In the case of the first three, we want to put the GETATTR
1602  * after the read-type operation -- this is because it is hard
1603  * to predict the length of a GETATTR response in v4, and thus
1604  * align the READ data correctly.  This means that the GETATTR
1605  * may end up partially falling into the page cache, and we should
1606  * shift it into the 'tail' of the xdr_buf before processing.
1607  * To do this efficiently, we need to know the total length
1608  * of data received, which doesn't seem to be available outside
1609  * of the RPC layer.
1610  *
1611  * In the case of WRITE, we also want to put the GETATTR after
1612  * the operation -- in this case because we want to make sure
1613  * we get the post-operation mtime and size.  This means that
1614  * we can't use xdr_encode_pages() as written: we need a variant
1615  * of it which would leave room in the 'tail' iovec.
1616  *
1617  * Both of these changes to the XDR layer would in fact be quite
1618  * minor, but I decided to leave them for a subsequent patch.
1619  */
1620 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1621                 unsigned int pgbase, unsigned int pglen)
1622 {
1623         struct nfs4_readlink args = {
1624                 .fh       = NFS_FH(inode),
1625                 .pgbase   = pgbase,
1626                 .pglen    = pglen,
1627                 .pages    = &page,
1628         };
1629         struct rpc_message msg = {
1630                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1631                 .rpc_argp = &args,
1632                 .rpc_resp = NULL,
1633         };
1634
1635         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1636 }
1637
1638 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1639                 unsigned int pgbase, unsigned int pglen)
1640 {
1641         struct nfs4_exception exception = { };
1642         int err;
1643         do {
1644                 err = nfs4_handle_exception(NFS_SERVER(inode),
1645                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1646                                 &exception);
1647         } while (exception.retry);
1648         return err;
1649 }
1650
1651 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1652 {
1653         int flags = rdata->flags;
1654         struct inode *inode = rdata->inode;
1655         struct nfs_fattr *fattr = rdata->res.fattr;
1656         struct nfs_server *server = NFS_SERVER(inode);
1657         struct rpc_message msg = {
1658                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1659                 .rpc_argp       = &rdata->args,
1660                 .rpc_resp       = &rdata->res,
1661                 .rpc_cred       = rdata->cred,
1662         };
1663         unsigned long timestamp = jiffies;
1664         int status;
1665
1666         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1667                         (long long) rdata->args.offset);
1668
1669         nfs_fattr_init(fattr);
1670         status = rpc_call_sync(server->client, &msg, flags);
1671         if (!status)
1672                 renew_lease(server, timestamp);
1673         dprintk("NFS reply read: %d\n", status);
1674         return status;
1675 }
1676
1677 static int nfs4_proc_read(struct nfs_read_data *rdata)
1678 {
1679         struct nfs4_exception exception = { };
1680         int err;
1681         do {
1682                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1683                                 _nfs4_proc_read(rdata),
1684                                 &exception);
1685         } while (exception.retry);
1686         return err;
1687 }
1688
1689 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1690 {
1691         int rpcflags = wdata->flags;
1692         struct inode *inode = wdata->inode;
1693         struct nfs_fattr *fattr = wdata->res.fattr;
1694         struct nfs_server *server = NFS_SERVER(inode);
1695         struct rpc_message msg = {
1696                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1697                 .rpc_argp       = &wdata->args,
1698                 .rpc_resp       = &wdata->res,
1699                 .rpc_cred       = wdata->cred,
1700         };
1701         int status;
1702
1703         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1704                         (long long) wdata->args.offset);
1705
1706         wdata->args.bitmask = server->attr_bitmask;
1707         wdata->res.server = server;
1708         wdata->timestamp = jiffies;
1709         nfs_fattr_init(fattr);
1710         status = rpc_call_sync(server->client, &msg, rpcflags);
1711         dprintk("NFS reply write: %d\n", status);
1712         if (status < 0)
1713                 return status;
1714         renew_lease(server, wdata->timestamp);
1715         nfs_post_op_update_inode(inode, fattr);
1716         return wdata->res.count;
1717 }
1718
1719 static int nfs4_proc_write(struct nfs_write_data *wdata)
1720 {
1721         struct nfs4_exception exception = { };
1722         int err;
1723         do {
1724                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1725                                 _nfs4_proc_write(wdata),
1726                                 &exception);
1727         } while (exception.retry);
1728         return err;
1729 }
1730
1731 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1732 {
1733         struct inode *inode = cdata->inode;
1734         struct nfs_fattr *fattr = cdata->res.fattr;
1735         struct nfs_server *server = NFS_SERVER(inode);
1736         struct rpc_message msg = {
1737                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1738                 .rpc_argp       = &cdata->args,
1739                 .rpc_resp       = &cdata->res,
1740                 .rpc_cred       = cdata->cred,
1741         };
1742         int status;
1743
1744         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1745                         (long long) cdata->args.offset);
1746
1747         cdata->args.bitmask = server->attr_bitmask;
1748         cdata->res.server = server;
1749         cdata->timestamp = jiffies;
1750         nfs_fattr_init(fattr);
1751         status = rpc_call_sync(server->client, &msg, 0);
1752         if (status >= 0)
1753                 renew_lease(server, cdata->timestamp);
1754         dprintk("NFS reply commit: %d\n", status);
1755         if (status >= 0)
1756                 nfs_post_op_update_inode(inode, fattr);
1757         return status;
1758 }
1759
1760 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1761 {
1762         struct nfs4_exception exception = { };
1763         int err;
1764         do {
1765                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1766                                 _nfs4_proc_commit(cdata),
1767                                 &exception);
1768         } while (exception.retry);
1769         return err;
1770 }
1771
1772 /*
1773  * Got race?
1774  * We will need to arrange for the VFS layer to provide an atomic open.
1775  * Until then, this create/open method is prone to inefficiency and race
1776  * conditions due to the lookup, create, and open VFS calls from sys_open()
1777  * placed on the wire.
1778  *
1779  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1780  * The file will be opened again in the subsequent VFS open call
1781  * (nfs4_proc_file_open).
1782  *
1783  * The open for read will just hang around to be used by any process that
1784  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1785  */
1786
1787 static int
1788 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1789                  int flags, struct nameidata *nd)
1790 {
1791         struct nfs4_state *state;
1792         struct rpc_cred *cred;
1793         int status = 0;
1794
1795         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1796         if (IS_ERR(cred)) {
1797                 status = PTR_ERR(cred);
1798                 goto out;
1799         }
1800         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1801         put_rpccred(cred);
1802         if (IS_ERR(state)) {
1803                 status = PTR_ERR(state);
1804                 goto out;
1805         }
1806         d_instantiate(dentry, igrab(state->inode));
1807         if (flags & O_EXCL) {
1808                 struct nfs_fattr fattr;
1809                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1810                                      NFS_FH(state->inode), sattr, state);
1811                 if (status == 0)
1812                         nfs_setattr_update_inode(state->inode, sattr);
1813         }
1814         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1815                 nfs4_intent_set_file(nd, dentry, state);
1816         else
1817                 nfs4_close_state(state, flags);
1818 out:
1819         return status;
1820 }
1821
1822 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1823 {
1824         struct nfs_server *server = NFS_SERVER(dir);
1825         struct nfs4_remove_arg args = {
1826                 .fh = NFS_FH(dir),
1827                 .name = name,
1828                 .bitmask = server->attr_bitmask,
1829         };
1830         struct nfs_fattr dir_attr;
1831         struct nfs4_remove_res  res = {
1832                 .server = server,
1833                 .dir_attr = &dir_attr,
1834         };
1835         struct rpc_message msg = {
1836                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1837                 .rpc_argp       = &args,
1838                 .rpc_resp       = &res,
1839         };
1840         int                     status;
1841
1842         nfs_fattr_init(res.dir_attr);
1843         status = rpc_call_sync(server->client, &msg, 0);
1844         if (status == 0) {
1845                 update_changeattr(dir, &res.cinfo);
1846                 nfs_post_op_update_inode(dir, res.dir_attr);
1847         }
1848         return status;
1849 }
1850
1851 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1852 {
1853         struct nfs4_exception exception = { };
1854         int err;
1855         do {
1856                 err = nfs4_handle_exception(NFS_SERVER(dir),
1857                                 _nfs4_proc_remove(dir, name),
1858                                 &exception);
1859         } while (exception.retry);
1860         return err;
1861 }
1862
1863 struct unlink_desc {
1864         struct nfs4_remove_arg  args;
1865         struct nfs4_remove_res  res;
1866         struct nfs_fattr dir_attr;
1867 };
1868
1869 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1870                 struct qstr *name)
1871 {
1872         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1873         struct unlink_desc *up;
1874
1875         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1876         if (!up)
1877                 return -ENOMEM;
1878
1879         up->args.fh = NFS_FH(dir->d_inode);
1880         up->args.name = name;
1881         up->args.bitmask = server->attr_bitmask;
1882         up->res.server = server;
1883         up->res.dir_attr = &up->dir_attr;
1884
1885         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1886         msg->rpc_argp = &up->args;
1887         msg->rpc_resp = &up->res;
1888         return 0;
1889 }
1890
1891 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1892 {
1893         struct rpc_message *msg = &task->tk_msg;
1894         struct unlink_desc *up;
1895
1896         if (msg->rpc_resp != NULL) {
1897                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1898                 update_changeattr(dir->d_inode, &up->res.cinfo);
1899                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1900                 kfree(up);
1901                 msg->rpc_resp = NULL;
1902                 msg->rpc_argp = NULL;
1903         }
1904         return 0;
1905 }
1906
1907 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1908                 struct inode *new_dir, struct qstr *new_name)
1909 {
1910         struct nfs_server *server = NFS_SERVER(old_dir);
1911         struct nfs4_rename_arg arg = {
1912                 .old_dir = NFS_FH(old_dir),
1913                 .new_dir = NFS_FH(new_dir),
1914                 .old_name = old_name,
1915                 .new_name = new_name,
1916                 .bitmask = server->attr_bitmask,
1917         };
1918         struct nfs_fattr old_fattr, new_fattr;
1919         struct nfs4_rename_res res = {
1920                 .server = server,
1921                 .old_fattr = &old_fattr,
1922                 .new_fattr = &new_fattr,
1923         };
1924         struct rpc_message msg = {
1925                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1926                 .rpc_argp = &arg,
1927                 .rpc_resp = &res,
1928         };
1929         int                     status;
1930
1931         nfs_fattr_init(res.old_fattr);
1932         nfs_fattr_init(res.new_fattr);
1933         status = rpc_call_sync(server->client, &msg, 0);
1934
1935         if (!status) {
1936                 update_changeattr(old_dir, &res.old_cinfo);
1937                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1938                 update_changeattr(new_dir, &res.new_cinfo);
1939                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1940         }
1941         return status;
1942 }
1943
1944 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1945                 struct inode *new_dir, struct qstr *new_name)
1946 {
1947         struct nfs4_exception exception = { };
1948         int err;
1949         do {
1950                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1951                                 _nfs4_proc_rename(old_dir, old_name,
1952                                         new_dir, new_name),
1953                                 &exception);
1954         } while (exception.retry);
1955         return err;
1956 }
1957
1958 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1959 {
1960         struct nfs_server *server = NFS_SERVER(inode);
1961         struct nfs4_link_arg arg = {
1962                 .fh     = NFS_FH(inode),
1963                 .dir_fh = NFS_FH(dir),
1964                 .name   = name,
1965                 .bitmask = server->attr_bitmask,
1966         };
1967         struct nfs_fattr fattr, dir_attr;
1968         struct nfs4_link_res res = {
1969                 .server = server,
1970                 .fattr = &fattr,
1971                 .dir_attr = &dir_attr,
1972         };
1973         struct rpc_message msg = {
1974                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1975                 .rpc_argp = &arg,
1976                 .rpc_resp = &res,
1977         };
1978         int                     status;
1979
1980         nfs_fattr_init(res.fattr);
1981         nfs_fattr_init(res.dir_attr);
1982         status = rpc_call_sync(server->client, &msg, 0);
1983         if (!status) {
1984                 update_changeattr(dir, &res.cinfo);
1985                 nfs_post_op_update_inode(dir, res.dir_attr);
1986                 nfs_refresh_inode(inode, res.fattr);
1987         }
1988
1989         return status;
1990 }
1991
1992 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1993 {
1994         struct nfs4_exception exception = { };
1995         int err;
1996         do {
1997                 err = nfs4_handle_exception(NFS_SERVER(inode),
1998                                 _nfs4_proc_link(inode, dir, name),
1999                                 &exception);
2000         } while (exception.retry);
2001         return err;
2002 }
2003
2004 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2005                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2006                 struct nfs_fattr *fattr)
2007 {
2008         struct nfs_server *server = NFS_SERVER(dir);
2009         struct nfs_fattr dir_fattr;
2010         struct nfs4_create_arg arg = {
2011                 .dir_fh = NFS_FH(dir),
2012                 .server = server,
2013                 .name = name,
2014                 .attrs = sattr,
2015                 .ftype = NF4LNK,
2016                 .bitmask = server->attr_bitmask,
2017         };
2018         struct nfs4_create_res res = {
2019                 .server = server,
2020                 .fh = fhandle,
2021                 .fattr = fattr,
2022                 .dir_fattr = &dir_fattr,
2023         };
2024         struct rpc_message msg = {
2025                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2026                 .rpc_argp = &arg,
2027                 .rpc_resp = &res,
2028         };
2029         int                     status;
2030
2031         if (path->len > NFS4_MAXPATHLEN)
2032                 return -ENAMETOOLONG;
2033         arg.u.symlink = path;
2034         nfs_fattr_init(fattr);
2035         nfs_fattr_init(&dir_fattr);
2036
2037         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2038         if (!status)
2039                 update_changeattr(dir, &res.dir_cinfo);
2040         nfs_post_op_update_inode(dir, res.dir_fattr);
2041         return status;
2042 }
2043
2044 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2045                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2046                 struct nfs_fattr *fattr)
2047 {
2048         struct nfs4_exception exception = { };
2049         int err;
2050         do {
2051                 err = nfs4_handle_exception(NFS_SERVER(dir),
2052                                 _nfs4_proc_symlink(dir, name, path, sattr,
2053                                         fhandle, fattr),
2054                                 &exception);
2055         } while (exception.retry);
2056         return err;
2057 }
2058
2059 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2060                 struct iattr *sattr)
2061 {
2062         struct nfs_server *server = NFS_SERVER(dir);
2063         struct nfs_fh fhandle;
2064         struct nfs_fattr fattr, dir_fattr;
2065         struct nfs4_create_arg arg = {
2066                 .dir_fh = NFS_FH(dir),
2067                 .server = server,
2068                 .name = &dentry->d_name,
2069                 .attrs = sattr,
2070                 .ftype = NF4DIR,
2071                 .bitmask = server->attr_bitmask,
2072         };
2073         struct nfs4_create_res res = {
2074                 .server = server,
2075                 .fh = &fhandle,
2076                 .fattr = &fattr,
2077                 .dir_fattr = &dir_fattr,
2078         };
2079         struct rpc_message msg = {
2080                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2081                 .rpc_argp = &arg,
2082                 .rpc_resp = &res,
2083         };
2084         int                     status;
2085
2086         nfs_fattr_init(&fattr);
2087         nfs_fattr_init(&dir_fattr);
2088
2089         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2090         if (!status) {
2091                 update_changeattr(dir, &res.dir_cinfo);
2092                 nfs_post_op_update_inode(dir, res.dir_fattr);
2093                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2094         }
2095         return status;
2096 }
2097
2098 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2099                 struct iattr *sattr)
2100 {
2101         struct nfs4_exception exception = { };
2102         int err;
2103         do {
2104                 err = nfs4_handle_exception(NFS_SERVER(dir),
2105                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2106                                 &exception);
2107         } while (exception.retry);
2108         return err;
2109 }
2110
2111 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2112                   u64 cookie, struct page *page, unsigned int count, int plus)
2113 {
2114         struct inode            *dir = dentry->d_inode;
2115         struct nfs4_readdir_arg args = {
2116                 .fh = NFS_FH(dir),
2117                 .pages = &page,
2118                 .pgbase = 0,
2119                 .count = count,
2120                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2121         };
2122         struct nfs4_readdir_res res;
2123         struct rpc_message msg = {
2124                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2125                 .rpc_argp = &args,
2126                 .rpc_resp = &res,
2127                 .rpc_cred = cred,
2128         };
2129         int                     status;
2130
2131         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2132                         dentry->d_parent->d_name.name,
2133                         dentry->d_name.name,
2134                         (unsigned long long)cookie);
2135         lock_kernel();
2136         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2137         res.pgbase = args.pgbase;
2138         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2139         if (status == 0)
2140                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2141         unlock_kernel();
2142         dprintk("%s: returns %d\n", __FUNCTION__, status);
2143         return status;
2144 }
2145
2146 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2147                   u64 cookie, struct page *page, unsigned int count, int plus)
2148 {
2149         struct nfs4_exception exception = { };
2150         int err;
2151         do {
2152                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2153                                 _nfs4_proc_readdir(dentry, cred, cookie,
2154                                         page, count, plus),
2155                                 &exception);
2156         } while (exception.retry);
2157         return err;
2158 }
2159
2160 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2161                 struct iattr *sattr, dev_t rdev)
2162 {
2163         struct nfs_server *server = NFS_SERVER(dir);
2164         struct nfs_fh fh;
2165         struct nfs_fattr fattr, dir_fattr;
2166         struct nfs4_create_arg arg = {
2167                 .dir_fh = NFS_FH(dir),
2168                 .server = server,
2169                 .name = &dentry->d_name,
2170                 .attrs = sattr,
2171                 .bitmask = server->attr_bitmask,
2172         };
2173         struct nfs4_create_res res = {
2174                 .server = server,
2175                 .fh = &fh,
2176                 .fattr = &fattr,
2177                 .dir_fattr = &dir_fattr,
2178         };
2179         struct rpc_message msg = {
2180                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2181                 .rpc_argp = &arg,
2182                 .rpc_resp = &res,
2183         };
2184         int                     status;
2185         int                     mode = sattr->ia_mode;
2186
2187         nfs_fattr_init(&fattr);
2188         nfs_fattr_init(&dir_fattr);
2189
2190         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2191         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2192         if (S_ISFIFO(mode))
2193                 arg.ftype = NF4FIFO;
2194         else if (S_ISBLK(mode)) {
2195                 arg.ftype = NF4BLK;
2196                 arg.u.device.specdata1 = MAJOR(rdev);
2197                 arg.u.device.specdata2 = MINOR(rdev);
2198         }
2199         else if (S_ISCHR(mode)) {
2200                 arg.ftype = NF4CHR;
2201                 arg.u.device.specdata1 = MAJOR(rdev);
2202                 arg.u.device.specdata2 = MINOR(rdev);
2203         }
2204         else
2205                 arg.ftype = NF4SOCK;
2206
2207         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2208         if (status == 0) {
2209                 update_changeattr(dir, &res.dir_cinfo);
2210                 nfs_post_op_update_inode(dir, res.dir_fattr);
2211                 status = nfs_instantiate(dentry, &fh, &fattr);
2212         }
2213         return status;
2214 }
2215
2216 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2217                 struct iattr *sattr, dev_t rdev)
2218 {
2219         struct nfs4_exception exception = { };
2220         int err;
2221         do {
2222                 err = nfs4_handle_exception(NFS_SERVER(dir),
2223                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2224                                 &exception);
2225         } while (exception.retry);
2226         return err;
2227 }
2228
2229 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2230                  struct nfs_fsstat *fsstat)
2231 {
2232         struct nfs4_statfs_arg args = {
2233                 .fh = fhandle,
2234                 .bitmask = server->attr_bitmask,
2235         };
2236         struct rpc_message msg = {
2237                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2238                 .rpc_argp = &args,
2239                 .rpc_resp = fsstat,
2240         };
2241
2242         nfs_fattr_init(fsstat->fattr);
2243         return rpc_call_sync(server->client, &msg, 0);
2244 }
2245
2246 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2247 {
2248         struct nfs4_exception exception = { };
2249         int err;
2250         do {
2251                 err = nfs4_handle_exception(server,
2252                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2253                                 &exception);
2254         } while (exception.retry);
2255         return err;
2256 }
2257
2258 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2259                 struct nfs_fsinfo *fsinfo)
2260 {
2261         struct nfs4_fsinfo_arg args = {
2262                 .fh = fhandle,
2263                 .bitmask = server->attr_bitmask,
2264         };
2265         struct rpc_message msg = {
2266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2267                 .rpc_argp = &args,
2268                 .rpc_resp = fsinfo,
2269         };
2270
2271         return rpc_call_sync(server->client, &msg, 0);
2272 }
2273
2274 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2275 {
2276         struct nfs4_exception exception = { };
2277         int err;
2278
2279         do {
2280                 err = nfs4_handle_exception(server,
2281                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2282                                 &exception);
2283         } while (exception.retry);
2284         return err;
2285 }
2286
2287 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2288 {
2289         nfs_fattr_init(fsinfo->fattr);
2290         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2291 }
2292
2293 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2294                 struct nfs_pathconf *pathconf)
2295 {
2296         struct nfs4_pathconf_arg args = {
2297                 .fh = fhandle,
2298                 .bitmask = server->attr_bitmask,
2299         };
2300         struct rpc_message msg = {
2301                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2302                 .rpc_argp = &args,
2303                 .rpc_resp = pathconf,
2304         };
2305
2306         /* None of the pathconf attributes are mandatory to implement */
2307         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2308                 memset(pathconf, 0, sizeof(*pathconf));
2309                 return 0;
2310         }
2311
2312         nfs_fattr_init(pathconf->fattr);
2313         return rpc_call_sync(server->client, &msg, 0);
2314 }
2315
2316 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2317                 struct nfs_pathconf *pathconf)
2318 {
2319         struct nfs4_exception exception = { };
2320         int err;
2321
2322         do {
2323                 err = nfs4_handle_exception(server,
2324                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2325                                 &exception);
2326         } while (exception.retry);
2327         return err;
2328 }
2329
2330 static void nfs4_read_done(struct rpc_task *task, void *calldata)
2331 {
2332         struct nfs_read_data *data = calldata;
2333         struct inode *inode = data->inode;
2334
2335         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2336                 rpc_restart_call(task);
2337                 return;
2338         }
2339         if (task->tk_status > 0)
2340                 renew_lease(NFS_SERVER(inode), data->timestamp);
2341         /* Call back common NFS readpage processing */
2342         nfs_readpage_result(task, calldata);
2343 }
2344
2345 static const struct rpc_call_ops nfs4_read_ops = {
2346         .rpc_call_done = nfs4_read_done,
2347         .rpc_release = nfs_readdata_release,
2348 };
2349
2350 static void
2351 nfs4_proc_read_setup(struct nfs_read_data *data)
2352 {
2353         struct rpc_task *task = &data->task;
2354         struct rpc_message msg = {
2355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2356                 .rpc_argp = &data->args,
2357                 .rpc_resp = &data->res,
2358                 .rpc_cred = data->cred,
2359         };
2360         struct inode *inode = data->inode;
2361         int flags;
2362
2363         data->timestamp   = jiffies;
2364
2365         /* N.B. Do we need to test? Never called for swapfile inode */
2366         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2367
2368         /* Finalize the task. */
2369         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_read_ops, data);
2370         rpc_call_setup(task, &msg, 0);
2371 }
2372
2373 static void nfs4_write_done(struct rpc_task *task, void *calldata)
2374 {
2375         struct nfs_write_data *data = calldata;
2376         struct inode *inode = data->inode;
2377
2378         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2379                 rpc_restart_call(task);
2380                 return;
2381         }
2382         if (task->tk_status >= 0) {
2383                 renew_lease(NFS_SERVER(inode), data->timestamp);
2384                 nfs_post_op_update_inode(inode, data->res.fattr);
2385         }
2386         /* Call back common NFS writeback processing */
2387         nfs_writeback_done(task, calldata);
2388 }
2389
2390 static const struct rpc_call_ops nfs4_write_ops = {
2391         .rpc_call_done = nfs4_write_done,
2392         .rpc_release = nfs_writedata_release,
2393 };
2394
2395 static void
2396 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2397 {
2398         struct rpc_task *task = &data->task;
2399         struct rpc_message msg = {
2400                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2401                 .rpc_argp = &data->args,
2402                 .rpc_resp = &data->res,
2403                 .rpc_cred = data->cred,
2404         };
2405         struct inode *inode = data->inode;
2406         struct nfs_server *server = NFS_SERVER(inode);
2407         int stable;
2408         int flags;
2409
2410         if (how & FLUSH_STABLE) {
2411                 if (!NFS_I(inode)->ncommit)
2412                         stable = NFS_FILE_SYNC;
2413                 else
2414                         stable = NFS_DATA_SYNC;
2415         } else
2416                 stable = NFS_UNSTABLE;
2417         data->args.stable = stable;
2418         data->args.bitmask = server->attr_bitmask;
2419         data->res.server = server;
2420
2421         data->timestamp   = jiffies;
2422
2423         /* Set the initial flags for the task.  */
2424         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2425
2426         /* Finalize the task. */
2427         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_write_ops, data);
2428         rpc_call_setup(task, &msg, 0);
2429 }
2430
2431 static void nfs4_commit_done(struct rpc_task *task, void *calldata)
2432 {
2433         struct nfs_write_data *data = calldata;
2434         struct inode *inode = data->inode;
2435
2436         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2437                 rpc_restart_call(task);
2438                 return;
2439         }
2440         if (task->tk_status >= 0)
2441                 nfs_post_op_update_inode(inode, data->res.fattr);
2442         /* Call back common NFS writeback processing */
2443         nfs_commit_done(task, calldata);
2444 }
2445
2446 static const struct rpc_call_ops nfs4_commit_ops = {
2447         .rpc_call_done = nfs4_commit_done,
2448         .rpc_release = nfs_commit_release,
2449 };
2450
2451 static void
2452 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2453 {
2454         struct rpc_task *task = &data->task;
2455         struct rpc_message msg = {
2456                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2457                 .rpc_argp = &data->args,
2458                 .rpc_resp = &data->res,
2459                 .rpc_cred = data->cred,
2460         };
2461         struct inode *inode = data->inode;
2462         struct nfs_server *server = NFS_SERVER(inode);
2463         int flags;
2464
2465         data->args.bitmask = server->attr_bitmask;
2466         data->res.server = server;
2467
2468         /* Set the initial flags for the task.  */
2469         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2470
2471         /* Finalize the task. */
2472         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_commit_ops, data);
2473         rpc_call_setup(task, &msg, 0);
2474 }
2475
2476 /*
2477  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2478  * standalone procedure for queueing an asynchronous RENEW.
2479  */
2480 static void nfs4_renew_done(struct rpc_task *task, void *data)
2481 {
2482         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2483         unsigned long timestamp = (unsigned long)data;
2484
2485         if (task->tk_status < 0) {
2486                 switch (task->tk_status) {
2487                         case -NFS4ERR_STALE_CLIENTID:
2488                         case -NFS4ERR_EXPIRED:
2489                         case -NFS4ERR_CB_PATH_DOWN:
2490                                 nfs4_schedule_state_recovery(clp);
2491                 }
2492                 return;
2493         }
2494         spin_lock(&clp->cl_lock);
2495         if (time_before(clp->cl_last_renewal,timestamp))
2496                 clp->cl_last_renewal = timestamp;
2497         spin_unlock(&clp->cl_lock);
2498 }
2499
2500 static const struct rpc_call_ops nfs4_renew_ops = {
2501         .rpc_call_done = nfs4_renew_done,
2502 };
2503
2504 int
2505 nfs4_proc_async_renew(struct nfs4_client *clp)
2506 {
2507         struct rpc_message msg = {
2508                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2509                 .rpc_argp       = clp,
2510                 .rpc_cred       = clp->cl_cred,
2511         };
2512
2513         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2514                         &nfs4_renew_ops, (void *)jiffies);
2515 }
2516
2517 int
2518 nfs4_proc_renew(struct nfs4_client *clp)
2519 {
2520         struct rpc_message msg = {
2521                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2522                 .rpc_argp       = clp,
2523                 .rpc_cred       = clp->cl_cred,
2524         };
2525         unsigned long now = jiffies;
2526         int status;
2527
2528         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2529         if (status < 0)
2530                 return status;
2531         spin_lock(&clp->cl_lock);
2532         if (time_before(clp->cl_last_renewal,now))
2533                 clp->cl_last_renewal = now;
2534         spin_unlock(&clp->cl_lock);
2535         return 0;
2536 }
2537
2538 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2539 {
2540         return (server->caps & NFS_CAP_ACLS)
2541                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2542                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2543 }
2544
2545 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2546  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2547  * the stack.
2548  */
2549 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2550
2551 static void buf_to_pages(const void *buf, size_t buflen,
2552                 struct page **pages, unsigned int *pgbase)
2553 {
2554         const void *p = buf;
2555
2556         *pgbase = offset_in_page(buf);
2557         p -= *pgbase;
2558         while (p < buf + buflen) {
2559                 *(pages++) = virt_to_page(p);
2560                 p += PAGE_CACHE_SIZE;
2561         }
2562 }
2563
2564 struct nfs4_cached_acl {
2565         int cached;
2566         size_t len;
2567         char data[0];
2568 };
2569
2570 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2571 {
2572         struct nfs_inode *nfsi = NFS_I(inode);
2573
2574         spin_lock(&inode->i_lock);
2575         kfree(nfsi->nfs4_acl);
2576         nfsi->nfs4_acl = acl;
2577         spin_unlock(&inode->i_lock);
2578 }
2579
2580 static void nfs4_zap_acl_attr(struct inode *inode)
2581 {
2582         nfs4_set_cached_acl(inode, NULL);
2583 }
2584
2585 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2586 {
2587         struct nfs_inode *nfsi = NFS_I(inode);
2588         struct nfs4_cached_acl *acl;
2589         int ret = -ENOENT;
2590
2591         spin_lock(&inode->i_lock);
2592         acl = nfsi->nfs4_acl;
2593         if (acl == NULL)
2594                 goto out;
2595         if (buf == NULL) /* user is just asking for length */
2596                 goto out_len;
2597         if (acl->cached == 0)
2598                 goto out;
2599         ret = -ERANGE; /* see getxattr(2) man page */
2600         if (acl->len > buflen)
2601                 goto out;
2602         memcpy(buf, acl->data, acl->len);
2603 out_len:
2604         ret = acl->len;
2605 out:
2606         spin_unlock(&inode->i_lock);
2607         return ret;
2608 }
2609
2610 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2611 {
2612         struct nfs4_cached_acl *acl;
2613
2614         if (buf && acl_len <= PAGE_SIZE) {
2615                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2616                 if (acl == NULL)
2617                         goto out;
2618                 acl->cached = 1;
2619                 memcpy(acl->data, buf, acl_len);
2620         } else {
2621                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2622                 if (acl == NULL)
2623                         goto out;
2624                 acl->cached = 0;
2625         }
2626         acl->len = acl_len;
2627 out:
2628         nfs4_set_cached_acl(inode, acl);
2629 }
2630
2631 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2632 {
2633         struct page *pages[NFS4ACL_MAXPAGES];
2634         struct nfs_getaclargs args = {
2635                 .fh = NFS_FH(inode),
2636                 .acl_pages = pages,
2637                 .acl_len = buflen,
2638         };
2639         size_t resp_len = buflen;
2640         void *resp_buf;
2641         struct rpc_message msg = {
2642                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2643                 .rpc_argp = &args,
2644                 .rpc_resp = &resp_len,
2645         };
2646         struct page *localpage = NULL;
2647         int ret;
2648
2649         if (buflen < PAGE_SIZE) {
2650                 /* As long as we're doing a round trip to the server anyway,
2651                  * let's be prepared for a page of acl data. */
2652                 localpage = alloc_page(GFP_KERNEL);
2653                 resp_buf = page_address(localpage);
2654                 if (localpage == NULL)
2655                         return -ENOMEM;
2656                 args.acl_pages[0] = localpage;
2657                 args.acl_pgbase = 0;
2658                 resp_len = args.acl_len = PAGE_SIZE;
2659         } else {
2660                 resp_buf = buf;
2661                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2662         }
2663         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2664         if (ret)
2665                 goto out_free;
2666         if (resp_len > args.acl_len)
2667                 nfs4_write_cached_acl(inode, NULL, resp_len);
2668         else
2669                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2670         if (buf) {
2671                 ret = -ERANGE;
2672                 if (resp_len > buflen)
2673                         goto out_free;
2674                 if (localpage)
2675                         memcpy(buf, resp_buf, resp_len);
2676         }
2677         ret = resp_len;
2678 out_free:
2679         if (localpage)
2680                 __free_page(localpage);
2681         return ret;
2682 }
2683
2684 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2685 {
2686         struct nfs_server *server = NFS_SERVER(inode);
2687         int ret;
2688
2689         if (!nfs4_server_supports_acls(server))
2690                 return -EOPNOTSUPP;
2691         ret = nfs_revalidate_inode(server, inode);
2692         if (ret < 0)
2693                 return ret;
2694         ret = nfs4_read_cached_acl(inode, buf, buflen);
2695         if (ret != -ENOENT)
2696                 return ret;
2697         return nfs4_get_acl_uncached(inode, buf, buflen);
2698 }
2699
2700 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2701 {
2702         struct nfs_server *server = NFS_SERVER(inode);
2703         struct page *pages[NFS4ACL_MAXPAGES];
2704         struct nfs_setaclargs arg = {
2705                 .fh             = NFS_FH(inode),
2706                 .acl_pages      = pages,
2707                 .acl_len        = buflen,
2708         };
2709         struct rpc_message msg = {
2710                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2711                 .rpc_argp       = &arg,
2712                 .rpc_resp       = NULL,
2713         };
2714         int ret;
2715
2716         if (!nfs4_server_supports_acls(server))
2717                 return -EOPNOTSUPP;
2718         nfs_inode_return_delegation(inode);
2719         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2720         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2721         if (ret == 0)
2722                 nfs4_write_cached_acl(inode, buf, buflen);
2723         return ret;
2724 }
2725
2726 static int
2727 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2728 {
2729         struct nfs4_client *clp = server->nfs4_state;
2730
2731         if (!clp || task->tk_status >= 0)
2732                 return 0;
2733         switch(task->tk_status) {
2734                 case -NFS4ERR_STALE_CLIENTID:
2735                 case -NFS4ERR_STALE_STATEID:
2736                 case -NFS4ERR_EXPIRED:
2737                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2738                         nfs4_schedule_state_recovery(clp);
2739                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2740                                 rpc_wake_up_task(task);
2741                         task->tk_status = 0;
2742                         return -EAGAIN;
2743                 case -NFS4ERR_GRACE:
2744                 case -NFS4ERR_DELAY:
2745                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2746                         task->tk_status = 0;
2747                         return -EAGAIN;
2748                 case -NFS4ERR_OLD_STATEID:
2749                         task->tk_status = 0;
2750                         return -EAGAIN;
2751         }
2752         task->tk_status = nfs4_map_errors(task->tk_status);
2753         return 0;
2754 }
2755
2756 static int nfs4_wait_bit_interruptible(void *word)
2757 {
2758         if (signal_pending(current))
2759                 return -ERESTARTSYS;
2760         schedule();
2761         return 0;
2762 }
2763
2764 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2765 {
2766         sigset_t oldset;
2767         int res;
2768
2769         might_sleep();
2770
2771         rpc_clnt_sigmask(clnt, &oldset);
2772         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2773                         nfs4_wait_bit_interruptible,
2774                         TASK_INTERRUPTIBLE);
2775         rpc_clnt_sigunmask(clnt, &oldset);
2776         return res;
2777 }
2778
2779 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2780 {
2781         sigset_t oldset;
2782         int res = 0;
2783
2784         might_sleep();
2785
2786         if (*timeout <= 0)
2787                 *timeout = NFS4_POLL_RETRY_MIN;
2788         if (*timeout > NFS4_POLL_RETRY_MAX)
2789                 *timeout = NFS4_POLL_RETRY_MAX;
2790         rpc_clnt_sigmask(clnt, &oldset);
2791         if (clnt->cl_intr) {
2792                 schedule_timeout_interruptible(*timeout);
2793                 if (signalled())
2794                         res = -ERESTARTSYS;
2795         } else
2796                 schedule_timeout_uninterruptible(*timeout);
2797         rpc_clnt_sigunmask(clnt, &oldset);
2798         *timeout <<= 1;
2799         return res;
2800 }
2801
2802 /* This is the error handling routine for processes that are allowed
2803  * to sleep.
2804  */
2805 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2806 {
2807         struct nfs4_client *clp = server->nfs4_state;
2808         int ret = errorcode;
2809
2810         exception->retry = 0;
2811         switch(errorcode) {
2812                 case 0:
2813                         return 0;
2814                 case -NFS4ERR_STALE_CLIENTID:
2815                 case -NFS4ERR_STALE_STATEID:
2816                 case -NFS4ERR_EXPIRED:
2817                         nfs4_schedule_state_recovery(clp);
2818                         ret = nfs4_wait_clnt_recover(server->client, clp);
2819                         if (ret == 0)
2820                                 exception->retry = 1;
2821                         break;
2822                 case -NFS4ERR_GRACE:
2823                 case -NFS4ERR_DELAY:
2824                         ret = nfs4_delay(server->client, &exception->timeout);
2825                         if (ret != 0)
2826                                 break;
2827                 case -NFS4ERR_OLD_STATEID:
2828                         exception->retry = 1;
2829         }
2830         /* We failed to handle the error */
2831         return nfs4_map_errors(ret);
2832 }
2833
2834 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2835 {
2836         nfs4_verifier sc_verifier;
2837         struct nfs4_setclientid setclientid = {
2838                 .sc_verifier = &sc_verifier,
2839                 .sc_prog = program,
2840         };
2841         struct rpc_message msg = {
2842                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2843                 .rpc_argp = &setclientid,
2844                 .rpc_resp = clp,
2845                 .rpc_cred = clp->cl_cred,
2846         };
2847         u32 *p;
2848         int loop = 0;
2849         int status;
2850
2851         p = (u32*)sc_verifier.data;
2852         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2853         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2854
2855         for(;;) {
2856                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2857                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2858                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2859                                 clp->cl_cred->cr_ops->cr_name,
2860                                 clp->cl_id_uniquifier);
2861                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2862                                 sizeof(setclientid.sc_netid), "tcp");
2863                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2864                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2865                                 clp->cl_ipaddr, port >> 8, port & 255);
2866
2867                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2868                 if (status != -NFS4ERR_CLID_INUSE)
2869                         break;
2870                 if (signalled())
2871                         break;
2872                 if (loop++ & 1)
2873                         ssleep(clp->cl_lease_time + 1);
2874                 else
2875                         if (++clp->cl_id_uniquifier == 0)
2876                                 break;
2877         }
2878         return status;
2879 }
2880
2881 int
2882 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2883 {
2884         struct nfs_fsinfo fsinfo;
2885         struct rpc_message msg = {
2886                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2887                 .rpc_argp = clp,
2888                 .rpc_resp = &fsinfo,
2889                 .rpc_cred = clp->cl_cred,
2890         };
2891         unsigned long now;
2892         int status;
2893
2894         now = jiffies;
2895         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2896         if (status == 0) {
2897                 spin_lock(&clp->cl_lock);
2898                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2899                 clp->cl_last_renewal = now;
2900                 spin_unlock(&clp->cl_lock);
2901         }
2902         return status;
2903 }
2904
2905 struct nfs4_delegreturndata {
2906         struct nfs4_delegreturnargs args;
2907         struct nfs_fh fh;
2908         nfs4_stateid stateid;
2909         struct rpc_cred *cred;
2910         unsigned long timestamp;
2911         const struct nfs_server *server;
2912         int rpc_status;
2913 };
2914
2915 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2916 {
2917         struct nfs4_delegreturndata *data = calldata;
2918         struct rpc_message msg = {
2919                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2920                 .rpc_argp = &data->args,
2921                 .rpc_cred = data->cred,
2922         };
2923         rpc_call_setup(task, &msg, 0);
2924 }
2925
2926 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2927 {
2928         struct nfs4_delegreturndata *data = calldata;
2929         data->rpc_status = task->tk_status;
2930         if (data->rpc_status == 0)
2931                 renew_lease(data->server, data->timestamp);
2932 }
2933
2934 static void nfs4_delegreturn_release(void *calldata)
2935 {
2936         struct nfs4_delegreturndata *data = calldata;
2937
2938         put_rpccred(data->cred);
2939         kfree(calldata);
2940 }
2941
2942 const static struct rpc_call_ops nfs4_delegreturn_ops = {
2943         .rpc_call_prepare = nfs4_delegreturn_prepare,
2944         .rpc_call_done = nfs4_delegreturn_done,
2945         .rpc_release = nfs4_delegreturn_release,
2946 };
2947
2948 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2949 {
2950         struct nfs4_delegreturndata *data;
2951         struct rpc_task *task;
2952         int status;
2953
2954         data = kmalloc(sizeof(*data), GFP_KERNEL);
2955         if (data == NULL)
2956                 return -ENOMEM;
2957         data->args.fhandle = &data->fh;
2958         data->args.stateid = &data->stateid;
2959         nfs_copy_fh(&data->fh, NFS_FH(inode));
2960         memcpy(&data->stateid, stateid, sizeof(data->stateid));
2961         data->cred = get_rpccred(cred);
2962         data->timestamp = jiffies;
2963         data->server = NFS_SERVER(inode);
2964         data->rpc_status = 0;
2965
2966         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
2967         if (IS_ERR(task)) {
2968                 nfs4_delegreturn_release(data);
2969                 return PTR_ERR(task);
2970         }
2971         status = nfs4_wait_for_completion_rpc_task(task);
2972         if (status == 0)
2973                 status = data->rpc_status;
2974         rpc_release_task(task);
2975         return status;
2976 }
2977
2978 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2979 {
2980         struct nfs_server *server = NFS_SERVER(inode);
2981         struct nfs4_exception exception = { };
2982         int err;
2983         do {
2984                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2985                 switch (err) {
2986                         case -NFS4ERR_STALE_STATEID:
2987                         case -NFS4ERR_EXPIRED:
2988                                 nfs4_schedule_state_recovery(server->nfs4_state);
2989                         case 0:
2990                                 return 0;
2991                 }
2992                 err = nfs4_handle_exception(server, err, &exception);
2993         } while (exception.retry);
2994         return err;
2995 }
2996
2997 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2998 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2999
3000 /*
3001  * sleep, with exponential backoff, and retry the LOCK operation.
3002  */
3003 static unsigned long
3004 nfs4_set_lock_task_retry(unsigned long timeout)
3005 {
3006         schedule_timeout_interruptible(timeout);
3007         timeout <<= 1;
3008         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3009                 return NFS4_LOCK_MAXTIMEOUT;
3010         return timeout;
3011 }
3012
3013 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3014 {
3015         struct inode *inode = state->inode;
3016         struct nfs_server *server = NFS_SERVER(inode);
3017         struct nfs4_client *clp = server->nfs4_state;
3018         struct nfs_lockt_args arg = {
3019                 .fh = NFS_FH(inode),
3020                 .fl = request,
3021         };
3022         struct nfs_lockt_res res = {
3023                 .denied = request,
3024         };
3025         struct rpc_message msg = {
3026                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3027                 .rpc_argp       = &arg,
3028                 .rpc_resp       = &res,
3029                 .rpc_cred       = state->owner->so_cred,
3030         };
3031         struct nfs4_lock_state *lsp;
3032         int status;
3033
3034         down_read(&clp->cl_sem);
3035         arg.lock_owner.clientid = clp->cl_clientid;
3036         status = nfs4_set_lock_state(state, request);
3037         if (status != 0)
3038                 goto out;
3039         lsp = request->fl_u.nfs4_fl.owner;
3040         arg.lock_owner.id = lsp->ls_id;
3041         status = rpc_call_sync(server->client, &msg, 0);
3042         switch (status) {
3043                 case 0:
3044                         request->fl_type = F_UNLCK;
3045                         break;
3046                 case -NFS4ERR_DENIED:
3047                         status = 0;
3048         }
3049 out:
3050         up_read(&clp->cl_sem);
3051         return status;
3052 }
3053
3054 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3055 {
3056         struct nfs4_exception exception = { };
3057         int err;
3058
3059         do {
3060                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3061                                 _nfs4_proc_getlk(state, cmd, request),
3062                                 &exception);
3063         } while (exception.retry);
3064         return err;
3065 }
3066
3067 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3068 {
3069         int res = 0;
3070         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3071                 case FL_POSIX:
3072                         res = posix_lock_file_wait(file, fl);
3073                         break;
3074                 case FL_FLOCK:
3075                         res = flock_lock_file_wait(file, fl);
3076                         break;
3077                 default:
3078                         BUG();
3079         }
3080         if (res < 0)
3081                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
3082                                 __FUNCTION__);
3083         return res;
3084 }
3085
3086 struct nfs4_unlockdata {
3087         struct nfs_locku_args arg;
3088         struct nfs_locku_res res;
3089         struct nfs4_lock_state *lsp;
3090         struct nfs_open_context *ctx;
3091         struct file_lock fl;
3092         const struct nfs_server *server;
3093         unsigned long timestamp;
3094 };
3095
3096 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3097                 struct nfs_open_context *ctx,
3098                 struct nfs4_lock_state *lsp,
3099                 struct nfs_seqid *seqid)
3100 {
3101         struct nfs4_unlockdata *p;
3102         struct inode *inode = lsp->ls_state->inode;
3103
3104         p = kmalloc(sizeof(*p), GFP_KERNEL);
3105         if (p == NULL)
3106                 return NULL;
3107         p->arg.fh = NFS_FH(inode);
3108         p->arg.fl = &p->fl;
3109         p->arg.seqid = seqid;
3110         p->arg.stateid = &lsp->ls_stateid;
3111         p->lsp = lsp;
3112         atomic_inc(&lsp->ls_count);
3113         /* Ensure we don't close file until we're done freeing locks! */
3114         p->ctx = get_nfs_open_context(ctx);
3115         memcpy(&p->fl, fl, sizeof(p->fl));
3116         p->server = NFS_SERVER(inode);
3117         return p;
3118 }
3119
3120 static void nfs4_locku_release_calldata(void *data)
3121 {
3122         struct nfs4_unlockdata *calldata = data;
3123         nfs_free_seqid(calldata->arg.seqid);
3124         nfs4_put_lock_state(calldata->lsp);
3125         put_nfs_open_context(calldata->ctx);
3126         kfree(calldata);
3127 }
3128
3129 static void nfs4_locku_done(struct rpc_task *task, void *data)
3130 {
3131         struct nfs4_unlockdata *calldata = data;
3132
3133         if (RPC_ASSASSINATED(task))
3134                 return;
3135         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3136         switch (task->tk_status) {
3137                 case 0:
3138                         memcpy(calldata->lsp->ls_stateid.data,
3139                                         calldata->res.stateid.data,
3140                                         sizeof(calldata->lsp->ls_stateid.data));
3141                         renew_lease(calldata->server, calldata->timestamp);
3142                         break;
3143                 case -NFS4ERR_STALE_STATEID:
3144                 case -NFS4ERR_EXPIRED:
3145                         nfs4_schedule_state_recovery(calldata->server->nfs4_state);
3146                         break;
3147                 default:
3148                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3149                                 rpc_restart_call(task);
3150                         }
3151         }
3152 }
3153
3154 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3155 {
3156         struct nfs4_unlockdata *calldata = data;
3157         struct rpc_message msg = {
3158                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3159                 .rpc_argp       = &calldata->arg,
3160                 .rpc_resp       = &calldata->res,
3161                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3162         };
3163
3164         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3165                 return;
3166         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3167                 /* Note: exit _without_ running nfs4_locku_done */
3168                 task->tk_action = NULL;
3169                 return;
3170         }
3171         calldata->timestamp = jiffies;
3172         rpc_call_setup(task, &msg, 0);
3173 }
3174
3175 static const struct rpc_call_ops nfs4_locku_ops = {
3176         .rpc_call_prepare = nfs4_locku_prepare,
3177         .rpc_call_done = nfs4_locku_done,
3178         .rpc_release = nfs4_locku_release_calldata,
3179 };
3180
3181 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3182                 struct nfs_open_context *ctx,
3183                 struct nfs4_lock_state *lsp,
3184                 struct nfs_seqid *seqid)
3185 {
3186         struct nfs4_unlockdata *data;
3187         struct rpc_task *task;
3188
3189         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3190         if (data == NULL) {
3191                 nfs_free_seqid(seqid);
3192                 return ERR_PTR(-ENOMEM);
3193         }
3194
3195         /* Unlock _before_ we do the RPC call */
3196         do_vfs_lock(fl->fl_file, fl);
3197         task = rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3198         if (IS_ERR(task))
3199                 nfs4_locku_release_calldata(data);
3200         return task;
3201 }
3202
3203 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3204 {
3205         struct nfs_seqid *seqid;
3206         struct nfs4_lock_state *lsp;
3207         struct rpc_task *task;
3208         int status = 0;
3209
3210         /* Is this a delegated lock? */
3211         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3212                 goto out_unlock;
3213         /* Is this open_owner holding any locks on the server? */
3214         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
3215                 goto out_unlock;
3216
3217         status = nfs4_set_lock_state(state, request);
3218         if (status != 0)
3219                 goto out_unlock;
3220         lsp = request->fl_u.nfs4_fl.owner;
3221         status = -ENOMEM;
3222         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3223         if (seqid == NULL)
3224                 goto out_unlock;
3225         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3226         status = PTR_ERR(task);
3227         if (IS_ERR(task))
3228                 goto out_unlock;
3229         status = nfs4_wait_for_completion_rpc_task(task);
3230         rpc_release_task(task);
3231         return status;
3232 out_unlock:
3233         do_vfs_lock(request->fl_file, request);
3234         return status;
3235 }
3236
3237 struct nfs4_lockdata {
3238         struct nfs_lock_args arg;
3239         struct nfs_lock_res res;
3240         struct nfs4_lock_state *lsp;
3241         struct nfs_open_context *ctx;
3242         struct file_lock fl;
3243         unsigned long timestamp;
3244         int rpc_status;
3245         int cancelled;
3246 };
3247
3248 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3249                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3250 {
3251         struct nfs4_lockdata *p;
3252         struct inode *inode = lsp->ls_state->inode;
3253         struct nfs_server *server = NFS_SERVER(inode);
3254
3255         p = kzalloc(sizeof(*p), GFP_KERNEL);
3256         if (p == NULL)
3257                 return NULL;
3258
3259         p->arg.fh = NFS_FH(inode);
3260         p->arg.fl = &p->fl;
3261         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3262         if (p->arg.lock_seqid == NULL)
3263                 goto out_free;
3264         p->arg.lock_stateid = &lsp->ls_stateid;
3265         p->arg.lock_owner.clientid = server->nfs4_state->cl_clientid;
3266         p->arg.lock_owner.id = lsp->ls_id;
3267         p->lsp = lsp;
3268         atomic_inc(&lsp->ls_count);
3269         p->ctx = get_nfs_open_context(ctx);
3270         memcpy(&p->fl, fl, sizeof(p->fl));
3271         return p;
3272 out_free:
3273         kfree(p);
3274         return NULL;
3275 }
3276
3277 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3278 {
3279         struct nfs4_lockdata *data = calldata;
3280         struct nfs4_state *state = data->lsp->ls_state;
3281         struct nfs4_state_owner *sp = state->owner;
3282         struct rpc_message msg = {
3283                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3284                 .rpc_argp = &data->arg,
3285                 .rpc_resp = &data->res,
3286                 .rpc_cred = sp->so_cred,
3287         };
3288
3289         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3290                 return;
3291         dprintk("%s: begin!\n", __FUNCTION__);
3292         /* Do we need to do an open_to_lock_owner? */
3293         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3294                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3295                 if (data->arg.open_seqid == NULL) {
3296                         data->rpc_status = -ENOMEM;
3297                         task->tk_action = NULL;
3298                         goto out;
3299                 }
3300                 data->arg.open_stateid = &state->stateid;
3301                 data->arg.new_lock_owner = 1;
3302         }
3303         data->timestamp = jiffies;
3304         rpc_call_setup(task, &msg, 0);
3305 out:
3306         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3307 }
3308
3309 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3310 {
3311         struct nfs4_lockdata *data = calldata;
3312
3313         dprintk("%s: begin!\n", __FUNCTION__);
3314
3315         data->rpc_status = task->tk_status;
3316         if (RPC_ASSASSINATED(task))
3317                 goto out;
3318         if (data->arg.new_lock_owner != 0) {
3319                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3320                 if (data->rpc_status == 0)
3321                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3322                 else
3323                         goto out;
3324         }
3325         if (data->rpc_status == 0) {
3326                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3327                                         sizeof(data->lsp->ls_stateid.data));
3328                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3329                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3330         }
3331         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3332 out:
3333         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3334 }
3335
3336 static void nfs4_lock_release(void *calldata)
3337 {
3338         struct nfs4_lockdata *data = calldata;
3339
3340         dprintk("%s: begin!\n", __FUNCTION__);
3341         if (data->arg.open_seqid != NULL)
3342                 nfs_free_seqid(data->arg.open_seqid);
3343         if (data->cancelled != 0) {
3344                 struct rpc_task *task;
3345                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3346                                 data->arg.lock_seqid);
3347                 if (!IS_ERR(task))
3348                         rpc_release_task(task);
3349                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3350         } else
3351                 nfs_free_seqid(data->arg.lock_seqid);
3352         nfs4_put_lock_state(data->lsp);
3353         put_nfs_open_context(data->ctx);
3354         kfree(data);
3355         dprintk("%s: done!\n", __FUNCTION__);
3356 }
3357
3358 static const struct rpc_call_ops nfs4_lock_ops = {
3359         .rpc_call_prepare = nfs4_lock_prepare,
3360         .rpc_call_done = nfs4_lock_done,
3361         .rpc_release = nfs4_lock_release,
3362 };
3363
3364 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3365 {
3366         struct nfs4_lockdata *data;
3367         struct rpc_task *task;
3368         int ret;
3369
3370         dprintk("%s: begin!\n", __FUNCTION__);
3371         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3372                         fl->fl_u.nfs4_fl.owner);
3373         if (data == NULL)
3374                 return -ENOMEM;
3375         if (IS_SETLKW(cmd))
3376                 data->arg.block = 1;
3377         if (reclaim != 0)
3378                 data->arg.reclaim = 1;
3379         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3380                         &nfs4_lock_ops, data);
3381         if (IS_ERR(task)) {
3382                 nfs4_lock_release(data);
3383                 return PTR_ERR(task);
3384         }
3385         ret = nfs4_wait_for_completion_rpc_task(task);
3386         if (ret == 0) {
3387                 ret = data->rpc_status;
3388                 if (ret == -NFS4ERR_DENIED)
3389                         ret = -EAGAIN;
3390         } else
3391                 data->cancelled = 1;
3392         rpc_release_task(task);
3393         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3394         return ret;
3395 }
3396
3397 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3398 {
3399         struct nfs_server *server = NFS_SERVER(state->inode);
3400         struct nfs4_exception exception = { };
3401         int err;
3402
3403         /* Cache the lock if possible... */
3404         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3405                 return 0;
3406         do {
3407                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3408                 if (err != -NFS4ERR_DELAY)
3409                         break;
3410                 nfs4_handle_exception(server, err, &exception);
3411         } while (exception.retry);
3412         return err;
3413 }
3414
3415 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3416 {
3417         struct nfs_server *server = NFS_SERVER(state->inode);
3418         struct nfs4_exception exception = { };
3419         int err;
3420
3421         err = nfs4_set_lock_state(state, request);
3422         if (err != 0)
3423                 return err;
3424         do {
3425                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3426                 if (err != -NFS4ERR_DELAY)
3427                         break;
3428                 nfs4_handle_exception(server, err, &exception);
3429         } while (exception.retry);
3430         return err;
3431 }
3432
3433 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3434 {
3435         struct nfs4_client *clp = state->owner->so_client;
3436         int status;
3437
3438         /* Is this a delegated open? */
3439         if (NFS_I(state->inode)->delegation_state != 0) {
3440                 /* Yes: cache locks! */
3441                 status = do_vfs_lock(request->fl_file, request);
3442                 /* ...but avoid races with delegation recall... */
3443                 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
3444                         return status;
3445         }
3446         down_read(&clp->cl_sem);
3447         status = nfs4_set_lock_state(state, request);
3448         if (status != 0)
3449                 goto out;
3450         status = _nfs4_do_setlk(state, cmd, request, 0);
3451         if (status != 0)
3452                 goto out;
3453         /* Note: we always want to sleep here! */
3454         request->fl_flags |= FL_SLEEP;
3455         if (do_vfs_lock(request->fl_file, request) < 0)
3456                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3457 out:
3458         up_read(&clp->cl_sem);
3459         return status;
3460 }
3461
3462 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3463 {
3464         struct nfs4_exception exception = { };
3465         int err;
3466
3467         do {
3468                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3469                                 _nfs4_proc_setlk(state, cmd, request),
3470                                 &exception);
3471         } while (exception.retry);
3472         return err;
3473 }
3474
3475 static int
3476 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3477 {
3478         struct nfs_open_context *ctx;
3479         struct nfs4_state *state;
3480         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3481         int status;
3482
3483         /* verify open state */
3484         ctx = (struct nfs_open_context *)filp->private_data;
3485         state = ctx->state;
3486
3487         if (request->fl_start < 0 || request->fl_end < 0)
3488                 return -EINVAL;
3489
3490         if (IS_GETLK(cmd))
3491                 return nfs4_proc_getlk(state, F_GETLK, request);
3492
3493         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3494                 return -EINVAL;
3495
3496         if (request->fl_type == F_UNLCK)
3497                 return nfs4_proc_unlck(state, cmd, request);
3498
3499         do {
3500                 status = nfs4_proc_setlk(state, cmd, request);
3501                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3502                         break;
3503                 timeout = nfs4_set_lock_task_retry(timeout);
3504                 status = -ERESTARTSYS;
3505                 if (signalled())
3506                         break;
3507         } while(status < 0);
3508         return status;
3509 }
3510
3511 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3512 {
3513         struct nfs_server *server = NFS_SERVER(state->inode);
3514         struct nfs4_exception exception = { };
3515         int err;
3516
3517         err = nfs4_set_lock_state(state, fl);
3518         if (err != 0)
3519                 goto out;
3520         do {
3521                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3522                 if (err != -NFS4ERR_DELAY)
3523                         break;
3524                 err = nfs4_handle_exception(server, err, &exception);
3525         } while (exception.retry);
3526 out:
3527         return err;
3528 }
3529
3530 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3531
3532 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3533                 size_t buflen, int flags)
3534 {
3535         struct inode *inode = dentry->d_inode;
3536
3537         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3538                 return -EOPNOTSUPP;
3539
3540         if (!S_ISREG(inode->i_mode) &&
3541             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3542                 return -EPERM;
3543
3544         return nfs4_proc_set_acl(inode, buf, buflen);
3545 }
3546
3547 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3548  * and that's what we'll do for e.g. user attributes that haven't been set.
3549  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3550  * attributes in kernel-managed attribute namespaces. */
3551 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3552                 size_t buflen)
3553 {
3554         struct inode *inode = dentry->d_inode;
3555
3556         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3557                 return -EOPNOTSUPP;
3558
3559         return nfs4_proc_get_acl(inode, buf, buflen);
3560 }
3561
3562 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3563 {
3564         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3565
3566         if (buf && buflen < len)
3567                 return -ERANGE;
3568         if (buf)
3569                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3570         return len;
3571 }
3572
3573 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3574         .recover_open   = nfs4_open_reclaim,
3575         .recover_lock   = nfs4_lock_reclaim,
3576 };
3577
3578 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3579         .recover_open   = nfs4_open_expired,
3580         .recover_lock   = nfs4_lock_expired,
3581 };
3582
3583 static struct inode_operations nfs4_file_inode_operations = {
3584         .permission     = nfs_permission,
3585         .getattr        = nfs_getattr,
3586         .setattr        = nfs_setattr,
3587         .getxattr       = nfs4_getxattr,
3588         .setxattr       = nfs4_setxattr,
3589         .listxattr      = nfs4_listxattr,
3590 };
3591
3592 struct nfs_rpc_ops      nfs_v4_clientops = {
3593         .version        = 4,                    /* protocol version */
3594         .dentry_ops     = &nfs4_dentry_operations,
3595         .dir_inode_ops  = &nfs4_dir_inode_operations,
3596         .file_inode_ops = &nfs4_file_inode_operations,
3597         .getroot        = nfs4_proc_get_root,
3598         .getattr        = nfs4_proc_getattr,
3599         .setattr        = nfs4_proc_setattr,
3600         .lookup         = nfs4_proc_lookup,
3601         .access         = nfs4_proc_access,
3602         .readlink       = nfs4_proc_readlink,
3603         .read           = nfs4_proc_read,
3604         .write          = nfs4_proc_write,
3605         .commit         = nfs4_proc_commit,
3606         .create         = nfs4_proc_create,
3607         .remove         = nfs4_proc_remove,
3608         .unlink_setup   = nfs4_proc_unlink_setup,
3609         .unlink_done    = nfs4_proc_unlink_done,
3610         .rename         = nfs4_proc_rename,
3611         .link           = nfs4_proc_link,
3612         .symlink        = nfs4_proc_symlink,
3613         .mkdir          = nfs4_proc_mkdir,
3614         .rmdir          = nfs4_proc_remove,
3615         .readdir        = nfs4_proc_readdir,
3616         .mknod          = nfs4_proc_mknod,
3617         .statfs         = nfs4_proc_statfs,
3618         .fsinfo         = nfs4_proc_fsinfo,
3619         .pathconf       = nfs4_proc_pathconf,
3620         .decode_dirent  = nfs4_decode_dirent,
3621         .read_setup     = nfs4_proc_read_setup,
3622         .write_setup    = nfs4_proc_write_setup,
3623         .commit_setup   = nfs4_proc_commit_setup,
3624         .file_open      = nfs_open,
3625         .file_release   = nfs_release,
3626         .lock           = nfs4_proc_lock,
3627         .clear_acl_cache = nfs4_zap_acl_attr,
3628 };
3629
3630 /*
3631  * Local variables:
3632  *  c-basic-offset: 8
3633  * End:
3634  */