1 /* 2 * fs/nfs/nfs4proc.c 3 * 4 * Client-side procedure declarations for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/mm.h> 39 #include <linux/utsname.h> 40 #include <linux/delay.h> 41 #include <linux/errno.h> 42 #include <linux/string.h> 43 #include <linux/sunrpc/clnt.h> 44 #include <linux/nfs.h> 45 #include <linux/nfs4.h> 46 #include <linux/nfs_fs.h> 47 #include <linux/nfs_page.h> 48 #include <linux/smp_lock.h> 49 #include <linux/namei.h> 50 #include <linux/mount.h> 51 52 #include "nfs4_fs.h" 53 #include "delegation.h" 54 #include "iostat.h" 55 56 #define NFSDBG_FACILITY NFSDBG_PROC 57 58 #define NFS4_POLL_RETRY_MIN (HZ/10) 59 #define NFS4_POLL_RETRY_MAX (15*HZ) 60 61 struct nfs4_opendata; 62 static int _nfs4_proc_open(struct nfs4_opendata *data); 63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *); 65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception); 66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp); 67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr); 68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr); 69 70 /* Prevent leaks of NFSv4 errors into userland */ 71 int nfs4_map_errors(int err) 72 { 73 if (err < -1000) { 74 dprintk("%s could not handle NFSv4 error %d\n", 75 __FUNCTION__, -err); 76 return -EIO; 77 } 78 return err; 79 } 80 81 /* 82 * This is our standard bitmap for GETATTR requests. 83 */ 84 const u32 nfs4_fattr_bitmap[2] = { 85 FATTR4_WORD0_TYPE 86 | FATTR4_WORD0_CHANGE 87 | FATTR4_WORD0_SIZE 88 | FATTR4_WORD0_FSID 89 | FATTR4_WORD0_FILEID, 90 FATTR4_WORD1_MODE 91 | FATTR4_WORD1_NUMLINKS 92 | FATTR4_WORD1_OWNER 93 | FATTR4_WORD1_OWNER_GROUP 94 | FATTR4_WORD1_RAWDEV 95 | FATTR4_WORD1_SPACE_USED 96 | FATTR4_WORD1_TIME_ACCESS 97 | FATTR4_WORD1_TIME_METADATA 98 | FATTR4_WORD1_TIME_MODIFY 99 }; 100 101 const u32 nfs4_statfs_bitmap[2] = { 102 FATTR4_WORD0_FILES_AVAIL 103 | FATTR4_WORD0_FILES_FREE 104 | FATTR4_WORD0_FILES_TOTAL, 105 FATTR4_WORD1_SPACE_AVAIL 106 | FATTR4_WORD1_SPACE_FREE 107 | FATTR4_WORD1_SPACE_TOTAL 108 }; 109 110 const u32 nfs4_pathconf_bitmap[2] = { 111 FATTR4_WORD0_MAXLINK 112 | FATTR4_WORD0_MAXNAME, 113 0 114 }; 115 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE 117 | FATTR4_WORD0_MAXREAD 118 | FATTR4_WORD0_MAXWRITE 119 | FATTR4_WORD0_LEASE_TIME, 120 0 121 }; 122 123 const u32 nfs4_fs_locations_bitmap[2] = { 124 FATTR4_WORD0_TYPE 125 | FATTR4_WORD0_CHANGE 126 | FATTR4_WORD0_SIZE 127 | FATTR4_WORD0_FSID 128 | FATTR4_WORD0_FILEID 129 | FATTR4_WORD0_FS_LOCATIONS, 130 FATTR4_WORD1_MODE 131 | FATTR4_WORD1_NUMLINKS 132 | FATTR4_WORD1_OWNER 133 | FATTR4_WORD1_OWNER_GROUP 134 | FATTR4_WORD1_RAWDEV 135 | FATTR4_WORD1_SPACE_USED 136 | FATTR4_WORD1_TIME_ACCESS 137 | FATTR4_WORD1_TIME_METADATA 138 | FATTR4_WORD1_TIME_MODIFY 139 | FATTR4_WORD1_MOUNTED_ON_FILEID 140 }; 141 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 143 struct nfs4_readdir_arg *readdir) 144 { 145 __be32 *start, *p; 146 147 BUG_ON(readdir->count < 80); 148 if (cookie > 2) { 149 readdir->cookie = cookie; 150 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 151 return; 152 } 153 154 readdir->cookie = 0; 155 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 156 if (cookie == 2) 157 return; 158 159 /* 160 * NFSv4 servers do not return entries for '.' and '..' 161 * Therefore, we fake these entries here. We let '.' 162 * have cookie 0 and '..' have cookie 1. Note that 163 * when talking to the server, we always send cookie 0 164 * instead of 1 or 2. 165 */ 166 start = p = kmap_atomic(*readdir->pages, KM_USER0); 167 168 if (cookie == 0) { 169 *p++ = xdr_one; /* next */ 170 *p++ = xdr_zero; /* cookie, first word */ 171 *p++ = xdr_one; /* cookie, second word */ 172 *p++ = xdr_one; /* entry len */ 173 memcpy(p, ".\0\0\0", 4); /* entry */ 174 p++; 175 *p++ = xdr_one; /* bitmap length */ 176 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 177 *p++ = htonl(8); /* attribute buffer length */ 178 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode)); 179 } 180 181 *p++ = xdr_one; /* next */ 182 *p++ = xdr_zero; /* cookie, first word */ 183 *p++ = xdr_two; /* cookie, second word */ 184 *p++ = xdr_two; /* entry len */ 185 memcpy(p, "..\0\0", 4); /* entry */ 186 p++; 187 *p++ = xdr_one; /* bitmap length */ 188 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 189 *p++ = htonl(8); /* attribute buffer length */ 190 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode)); 191 192 readdir->pgbase = (char *)p - (char *)start; 193 readdir->count -= readdir->pgbase; 194 kunmap_atomic(start, KM_USER0); 195 } 196 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 198 { 199 struct nfs_client *clp = server->nfs_client; 200 spin_lock(&clp->cl_lock); 201 if (time_before(clp->cl_last_renewal,timestamp)) 202 clp->cl_last_renewal = timestamp; 203 spin_unlock(&clp->cl_lock); 204 } 205 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo) 207 { 208 struct nfs_inode *nfsi = NFS_I(dir); 209 210 spin_lock(&dir->i_lock); 211 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA; 212 if (!cinfo->atomic || cinfo->before != nfsi->change_attr) 213 nfsi->cache_change_attribute = jiffies; 214 nfsi->change_attr = cinfo->after; 215 spin_unlock(&dir->i_lock); 216 } 217 218 struct nfs4_opendata { 219 struct kref kref; 220 struct nfs_openargs o_arg; 221 struct nfs_openres o_res; 222 struct nfs_open_confirmargs c_arg; 223 struct nfs_open_confirmres c_res; 224 struct nfs_fattr f_attr; 225 struct nfs_fattr dir_attr; 226 struct path path; 227 struct dentry *dir; 228 struct nfs4_state_owner *owner; 229 struct nfs4_state *state; 230 struct iattr attrs; 231 unsigned long timestamp; 232 unsigned int rpc_done : 1; 233 int rpc_status; 234 int cancelled; 235 }; 236 237 238 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 239 { 240 p->o_res.f_attr = &p->f_attr; 241 p->o_res.dir_attr = &p->dir_attr; 242 p->o_res.server = p->o_arg.server; 243 nfs_fattr_init(&p->f_attr); 244 nfs_fattr_init(&p->dir_attr); 245 } 246 247 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path, 248 struct nfs4_state_owner *sp, int flags, 249 const struct iattr *attrs) 250 { 251 struct dentry *parent = dget_parent(path->dentry); 252 struct inode *dir = parent->d_inode; 253 struct nfs_server *server = NFS_SERVER(dir); 254 struct nfs4_opendata *p; 255 256 p = kzalloc(sizeof(*p), GFP_KERNEL); 257 if (p == NULL) 258 goto err; 259 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid); 260 if (p->o_arg.seqid == NULL) 261 goto err_free; 262 p->path.mnt = mntget(path->mnt); 263 p->path.dentry = dget(path->dentry); 264 p->dir = parent; 265 p->owner = sp; 266 atomic_inc(&sp->so_count); 267 p->o_arg.fh = NFS_FH(dir); 268 p->o_arg.open_flags = flags, 269 p->o_arg.clientid = server->nfs_client->cl_clientid; 270 p->o_arg.id = sp->so_owner_id.id; 271 p->o_arg.name = &p->path.dentry->d_name; 272 p->o_arg.server = server; 273 p->o_arg.bitmask = server->attr_bitmask; 274 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL; 275 if (flags & O_EXCL) { 276 u32 *s = (u32 *) p->o_arg.u.verifier.data; 277 s[0] = jiffies; 278 s[1] = current->pid; 279 } else if (flags & O_CREAT) { 280 p->o_arg.u.attrs = &p->attrs; 281 memcpy(&p->attrs, attrs, sizeof(p->attrs)); 282 } 283 p->c_arg.fh = &p->o_res.fh; 284 p->c_arg.stateid = &p->o_res.stateid; 285 p->c_arg.seqid = p->o_arg.seqid; 286 nfs4_init_opendata_res(p); 287 kref_init(&p->kref); 288 return p; 289 err_free: 290 kfree(p); 291 err: 292 dput(parent); 293 return NULL; 294 } 295 296 static void nfs4_opendata_free(struct kref *kref) 297 { 298 struct nfs4_opendata *p = container_of(kref, 299 struct nfs4_opendata, kref); 300 301 nfs_free_seqid(p->o_arg.seqid); 302 if (p->state != NULL) 303 nfs4_put_open_state(p->state); 304 nfs4_put_state_owner(p->owner); 305 dput(p->dir); 306 dput(p->path.dentry); 307 mntput(p->path.mnt); 308 kfree(p); 309 } 310 311 static void nfs4_opendata_put(struct nfs4_opendata *p) 312 { 313 if (p != NULL) 314 kref_put(&p->kref, nfs4_opendata_free); 315 } 316 317 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task) 318 { 319 sigset_t oldset; 320 int ret; 321 322 rpc_clnt_sigmask(task->tk_client, &oldset); 323 ret = rpc_wait_for_completion_task(task); 324 rpc_clnt_sigunmask(task->tk_client, &oldset); 325 return ret; 326 } 327 328 static int can_open_cached(struct nfs4_state *state, int mode) 329 { 330 int ret = 0; 331 switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) { 332 case FMODE_READ: 333 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0; 334 break; 335 case FMODE_WRITE: 336 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0; 337 break; 338 case FMODE_READ|FMODE_WRITE: 339 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0; 340 } 341 return ret; 342 } 343 344 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags) 345 { 346 if ((delegation->type & open_flags) != open_flags) 347 return 0; 348 if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) 349 return 0; 350 return 1; 351 } 352 353 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags) 354 { 355 switch (open_flags) { 356 case FMODE_WRITE: 357 state->n_wronly++; 358 break; 359 case FMODE_READ: 360 state->n_rdonly++; 361 break; 362 case FMODE_READ|FMODE_WRITE: 363 state->n_rdwr++; 364 } 365 nfs4_state_set_mode_locked(state, state->state | open_flags); 366 } 367 368 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags) 369 { 370 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 371 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data)); 372 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data)); 373 switch (open_flags) { 374 case FMODE_READ: 375 set_bit(NFS_O_RDONLY_STATE, &state->flags); 376 break; 377 case FMODE_WRITE: 378 set_bit(NFS_O_WRONLY_STATE, &state->flags); 379 break; 380 case FMODE_READ|FMODE_WRITE: 381 set_bit(NFS_O_RDWR_STATE, &state->flags); 382 } 383 } 384 385 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags) 386 { 387 write_seqlock(&state->seqlock); 388 nfs_set_open_stateid_locked(state, stateid, open_flags); 389 write_sequnlock(&state->seqlock); 390 } 391 392 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags) 393 { 394 open_flags &= (FMODE_READ|FMODE_WRITE); 395 /* 396 * Protect the call to nfs4_state_set_mode_locked and 397 * serialise the stateid update 398 */ 399 write_seqlock(&state->seqlock); 400 if (deleg_stateid != NULL) { 401 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data)); 402 set_bit(NFS_DELEGATED_STATE, &state->flags); 403 } 404 if (open_stateid != NULL) 405 nfs_set_open_stateid_locked(state, open_stateid, open_flags); 406 write_sequnlock(&state->seqlock); 407 spin_lock(&state->owner->so_lock); 408 update_open_stateflags(state, open_flags); 409 spin_unlock(&state->owner->so_lock); 410 } 411 412 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags) 413 { 414 struct nfs_delegation *delegation; 415 416 rcu_read_lock(); 417 delegation = rcu_dereference(NFS_I(inode)->delegation); 418 if (delegation == NULL || (delegation->type & open_flags) == open_flags) { 419 rcu_read_unlock(); 420 return; 421 } 422 rcu_read_unlock(); 423 nfs_inode_return_delegation(inode); 424 } 425 426 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 427 { 428 struct nfs4_state *state = opendata->state; 429 struct nfs_inode *nfsi = NFS_I(state->inode); 430 struct nfs_delegation *delegation; 431 int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL); 432 nfs4_stateid stateid; 433 int ret = -EAGAIN; 434 435 rcu_read_lock(); 436 delegation = rcu_dereference(nfsi->delegation); 437 for (;;) { 438 if (can_open_cached(state, open_mode)) { 439 spin_lock(&state->owner->so_lock); 440 if (can_open_cached(state, open_mode)) { 441 update_open_stateflags(state, open_mode); 442 spin_unlock(&state->owner->so_lock); 443 rcu_read_unlock(); 444 goto out_return_state; 445 } 446 spin_unlock(&state->owner->so_lock); 447 } 448 if (delegation == NULL) 449 break; 450 if (!can_open_delegated(delegation, open_mode)) 451 break; 452 /* Save the delegation */ 453 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data)); 454 rcu_read_unlock(); 455 lock_kernel(); 456 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 457 unlock_kernel(); 458 if (ret != 0) 459 goto out; 460 ret = -EAGAIN; 461 rcu_read_lock(); 462 delegation = rcu_dereference(nfsi->delegation); 463 /* If no delegation, try a cached open */ 464 if (delegation == NULL) 465 continue; 466 /* Is the delegation still valid? */ 467 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0) 468 continue; 469 rcu_read_unlock(); 470 update_open_stateid(state, NULL, &stateid, open_mode); 471 goto out_return_state; 472 } 473 rcu_read_unlock(); 474 out: 475 return ERR_PTR(ret); 476 out_return_state: 477 atomic_inc(&state->count); 478 return state; 479 } 480 481 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 482 { 483 struct inode *inode; 484 struct nfs4_state *state = NULL; 485 struct nfs_delegation *delegation; 486 nfs4_stateid *deleg_stateid = NULL; 487 int ret; 488 489 if (!data->rpc_done) { 490 state = nfs4_try_open_cached(data); 491 goto out; 492 } 493 494 ret = -EAGAIN; 495 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 496 goto err; 497 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr); 498 ret = PTR_ERR(inode); 499 if (IS_ERR(inode)) 500 goto err; 501 ret = -ENOMEM; 502 state = nfs4_get_open_state(inode, data->owner); 503 if (state == NULL) 504 goto err_put_inode; 505 if (data->o_res.delegation_type != 0) { 506 int delegation_flags = 0; 507 508 rcu_read_lock(); 509 delegation = rcu_dereference(NFS_I(inode)->delegation); 510 if (delegation) 511 delegation_flags = delegation->flags; 512 rcu_read_unlock(); 513 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM)) 514 nfs_inode_set_delegation(state->inode, 515 data->owner->so_cred, 516 &data->o_res); 517 else 518 nfs_inode_reclaim_delegation(state->inode, 519 data->owner->so_cred, 520 &data->o_res); 521 } 522 rcu_read_lock(); 523 delegation = rcu_dereference(NFS_I(inode)->delegation); 524 if (delegation != NULL) 525 deleg_stateid = &delegation->stateid; 526 update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags); 527 rcu_read_unlock(); 528 iput(inode); 529 out: 530 return state; 531 err_put_inode: 532 iput(inode); 533 err: 534 return ERR_PTR(ret); 535 } 536 537 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 538 { 539 struct nfs_inode *nfsi = NFS_I(state->inode); 540 struct nfs_open_context *ctx; 541 542 spin_lock(&state->inode->i_lock); 543 list_for_each_entry(ctx, &nfsi->open_files, list) { 544 if (ctx->state != state) 545 continue; 546 get_nfs_open_context(ctx); 547 spin_unlock(&state->inode->i_lock); 548 return ctx; 549 } 550 spin_unlock(&state->inode->i_lock); 551 return ERR_PTR(-ENOENT); 552 } 553 554 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state) 555 { 556 struct nfs4_opendata *opendata; 557 558 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL); 559 if (opendata == NULL) 560 return ERR_PTR(-ENOMEM); 561 opendata->state = state; 562 atomic_inc(&state->count); 563 return opendata; 564 } 565 566 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res) 567 { 568 struct nfs4_state *newstate; 569 int ret; 570 571 opendata->o_arg.open_flags = openflags; 572 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 573 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 574 nfs4_init_opendata_res(opendata); 575 ret = _nfs4_proc_open(opendata); 576 if (ret != 0) 577 return ret; 578 newstate = nfs4_opendata_to_nfs4_state(opendata); 579 if (IS_ERR(newstate)) 580 return PTR_ERR(newstate); 581 nfs4_close_state(&opendata->path, newstate, openflags); 582 *res = newstate; 583 return 0; 584 } 585 586 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 587 { 588 struct nfs4_state *newstate; 589 int ret; 590 591 /* memory barrier prior to reading state->n_* */ 592 clear_bit(NFS_DELEGATED_STATE, &state->flags); 593 smp_rmb(); 594 if (state->n_rdwr != 0) { 595 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate); 596 if (ret != 0) 597 return ret; 598 if (newstate != state) 599 return -ESTALE; 600 } 601 if (state->n_wronly != 0) { 602 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate); 603 if (ret != 0) 604 return ret; 605 if (newstate != state) 606 return -ESTALE; 607 } 608 if (state->n_rdonly != 0) { 609 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate); 610 if (ret != 0) 611 return ret; 612 if (newstate != state) 613 return -ESTALE; 614 } 615 /* 616 * We may have performed cached opens for all three recoveries. 617 * Check if we need to update the current stateid. 618 */ 619 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 620 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) { 621 write_seqlock(&state->seqlock); 622 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 623 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)); 624 write_sequnlock(&state->seqlock); 625 } 626 return 0; 627 } 628 629 /* 630 * OPEN_RECLAIM: 631 * reclaim state on the server after a reboot. 632 */ 633 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 634 { 635 struct nfs_delegation *delegation; 636 struct nfs4_opendata *opendata; 637 int delegation_type = 0; 638 int status; 639 640 opendata = nfs4_open_recoverdata_alloc(ctx, state); 641 if (IS_ERR(opendata)) 642 return PTR_ERR(opendata); 643 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS; 644 opendata->o_arg.fh = NFS_FH(state->inode); 645 rcu_read_lock(); 646 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 647 if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0) 648 delegation_type = delegation->type; 649 rcu_read_unlock(); 650 opendata->o_arg.u.delegation_type = delegation_type; 651 status = nfs4_open_recover(opendata, state); 652 nfs4_opendata_put(opendata); 653 return status; 654 } 655 656 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 657 { 658 struct nfs_server *server = NFS_SERVER(state->inode); 659 struct nfs4_exception exception = { }; 660 int err; 661 do { 662 err = _nfs4_do_open_reclaim(ctx, state); 663 if (err != -NFS4ERR_DELAY) 664 break; 665 nfs4_handle_exception(server, err, &exception); 666 } while (exception.retry); 667 return err; 668 } 669 670 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 671 { 672 struct nfs_open_context *ctx; 673 int ret; 674 675 ctx = nfs4_state_find_open_context(state); 676 if (IS_ERR(ctx)) 677 return PTR_ERR(ctx); 678 ret = nfs4_do_open_reclaim(ctx, state); 679 put_nfs_open_context(ctx); 680 return ret; 681 } 682 683 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) 684 { 685 struct nfs4_opendata *opendata; 686 int ret; 687 688 opendata = nfs4_open_recoverdata_alloc(ctx, state); 689 if (IS_ERR(opendata)) 690 return PTR_ERR(opendata); 691 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR; 692 memcpy(opendata->o_arg.u.delegation.data, stateid->data, 693 sizeof(opendata->o_arg.u.delegation.data)); 694 ret = nfs4_open_recover(opendata, state); 695 nfs4_opendata_put(opendata); 696 return ret; 697 } 698 699 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) 700 { 701 struct nfs4_exception exception = { }; 702 struct nfs_server *server = NFS_SERVER(state->inode); 703 int err; 704 do { 705 err = _nfs4_open_delegation_recall(ctx, state, stateid); 706 switch (err) { 707 case 0: 708 return err; 709 case -NFS4ERR_STALE_CLIENTID: 710 case -NFS4ERR_STALE_STATEID: 711 case -NFS4ERR_EXPIRED: 712 /* Don't recall a delegation if it was lost */ 713 nfs4_schedule_state_recovery(server->nfs_client); 714 return err; 715 } 716 err = nfs4_handle_exception(server, err, &exception); 717 } while (exception.retry); 718 return err; 719 } 720 721 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 722 { 723 struct nfs4_opendata *data = calldata; 724 struct rpc_message msg = { 725 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 726 .rpc_argp = &data->c_arg, 727 .rpc_resp = &data->c_res, 728 .rpc_cred = data->owner->so_cred, 729 }; 730 data->timestamp = jiffies; 731 rpc_call_setup(task, &msg, 0); 732 } 733 734 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 735 { 736 struct nfs4_opendata *data = calldata; 737 738 data->rpc_status = task->tk_status; 739 if (RPC_ASSASSINATED(task)) 740 return; 741 if (data->rpc_status == 0) { 742 memcpy(data->o_res.stateid.data, data->c_res.stateid.data, 743 sizeof(data->o_res.stateid.data)); 744 renew_lease(data->o_res.server, data->timestamp); 745 data->rpc_done = 1; 746 } 747 nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status); 748 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid); 749 } 750 751 static void nfs4_open_confirm_release(void *calldata) 752 { 753 struct nfs4_opendata *data = calldata; 754 struct nfs4_state *state = NULL; 755 756 /* If this request hasn't been cancelled, do nothing */ 757 if (data->cancelled == 0) 758 goto out_free; 759 /* In case of error, no cleanup! */ 760 if (!data->rpc_done) 761 goto out_free; 762 nfs_confirm_seqid(&data->owner->so_seqid, 0); 763 state = nfs4_opendata_to_nfs4_state(data); 764 if (!IS_ERR(state)) 765 nfs4_close_state(&data->path, state, data->o_arg.open_flags); 766 out_free: 767 nfs4_opendata_put(data); 768 } 769 770 static const struct rpc_call_ops nfs4_open_confirm_ops = { 771 .rpc_call_prepare = nfs4_open_confirm_prepare, 772 .rpc_call_done = nfs4_open_confirm_done, 773 .rpc_release = nfs4_open_confirm_release, 774 }; 775 776 /* 777 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 778 */ 779 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 780 { 781 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 782 struct rpc_task *task; 783 int status; 784 785 kref_get(&data->kref); 786 data->rpc_done = 0; 787 data->rpc_status = 0; 788 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data); 789 if (IS_ERR(task)) 790 return PTR_ERR(task); 791 status = nfs4_wait_for_completion_rpc_task(task); 792 if (status != 0) { 793 data->cancelled = 1; 794 smp_wmb(); 795 } else 796 status = data->rpc_status; 797 rpc_put_task(task); 798 return status; 799 } 800 801 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 802 { 803 struct nfs4_opendata *data = calldata; 804 struct nfs4_state_owner *sp = data->owner; 805 struct rpc_message msg = { 806 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 807 .rpc_argp = &data->o_arg, 808 .rpc_resp = &data->o_res, 809 .rpc_cred = sp->so_cred, 810 }; 811 812 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 813 return; 814 /* 815 * Check if we still need to send an OPEN call, or if we can use 816 * a delegation instead. 817 */ 818 if (data->state != NULL) { 819 struct nfs_delegation *delegation; 820 821 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL))) 822 goto out_no_action; 823 rcu_read_lock(); 824 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 825 if (delegation != NULL && 826 (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) { 827 rcu_read_unlock(); 828 goto out_no_action; 829 } 830 rcu_read_unlock(); 831 } 832 /* Update sequence id. */ 833 data->o_arg.id = sp->so_owner_id.id; 834 data->o_arg.clientid = sp->so_client->cl_clientid; 835 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) { 836 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 837 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh); 838 } 839 data->timestamp = jiffies; 840 rpc_call_setup(task, &msg, 0); 841 return; 842 out_no_action: 843 task->tk_action = NULL; 844 845 } 846 847 static void nfs4_open_done(struct rpc_task *task, void *calldata) 848 { 849 struct nfs4_opendata *data = calldata; 850 851 data->rpc_status = task->tk_status; 852 if (RPC_ASSASSINATED(task)) 853 return; 854 if (task->tk_status == 0) { 855 switch (data->o_res.f_attr->mode & S_IFMT) { 856 case S_IFREG: 857 break; 858 case S_IFLNK: 859 data->rpc_status = -ELOOP; 860 break; 861 case S_IFDIR: 862 data->rpc_status = -EISDIR; 863 break; 864 default: 865 data->rpc_status = -ENOTDIR; 866 } 867 renew_lease(data->o_res.server, data->timestamp); 868 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 869 nfs_confirm_seqid(&data->owner->so_seqid, 0); 870 } 871 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid); 872 data->rpc_done = 1; 873 } 874 875 static void nfs4_open_release(void *calldata) 876 { 877 struct nfs4_opendata *data = calldata; 878 struct nfs4_state *state = NULL; 879 880 /* If this request hasn't been cancelled, do nothing */ 881 if (data->cancelled == 0) 882 goto out_free; 883 /* In case of error, no cleanup! */ 884 if (data->rpc_status != 0 || !data->rpc_done) 885 goto out_free; 886 /* In case we need an open_confirm, no cleanup! */ 887 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 888 goto out_free; 889 nfs_confirm_seqid(&data->owner->so_seqid, 0); 890 state = nfs4_opendata_to_nfs4_state(data); 891 if (!IS_ERR(state)) 892 nfs4_close_state(&data->path, state, data->o_arg.open_flags); 893 out_free: 894 nfs4_opendata_put(data); 895 } 896 897 static const struct rpc_call_ops nfs4_open_ops = { 898 .rpc_call_prepare = nfs4_open_prepare, 899 .rpc_call_done = nfs4_open_done, 900 .rpc_release = nfs4_open_release, 901 }; 902 903 /* 904 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 905 */ 906 static int _nfs4_proc_open(struct nfs4_opendata *data) 907 { 908 struct inode *dir = data->dir->d_inode; 909 struct nfs_server *server = NFS_SERVER(dir); 910 struct nfs_openargs *o_arg = &data->o_arg; 911 struct nfs_openres *o_res = &data->o_res; 912 struct rpc_task *task; 913 int status; 914 915 kref_get(&data->kref); 916 data->rpc_done = 0; 917 data->rpc_status = 0; 918 data->cancelled = 0; 919 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data); 920 if (IS_ERR(task)) 921 return PTR_ERR(task); 922 status = nfs4_wait_for_completion_rpc_task(task); 923 if (status != 0) { 924 data->cancelled = 1; 925 smp_wmb(); 926 } else 927 status = data->rpc_status; 928 rpc_put_task(task); 929 if (status != 0 || !data->rpc_done) 930 return status; 931 932 if (o_res->fh.size == 0) 933 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr); 934 935 if (o_arg->open_flags & O_CREAT) { 936 update_changeattr(dir, &o_res->cinfo); 937 nfs_post_op_update_inode(dir, o_res->dir_attr); 938 } else 939 nfs_refresh_inode(dir, o_res->dir_attr); 940 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 941 status = _nfs4_proc_open_confirm(data); 942 if (status != 0) 943 return status; 944 } 945 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) 946 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr); 947 return 0; 948 } 949 950 static int nfs4_recover_expired_lease(struct nfs_server *server) 951 { 952 struct nfs_client *clp = server->nfs_client; 953 int ret; 954 955 for (;;) { 956 ret = nfs4_wait_clnt_recover(server->client, clp); 957 if (ret != 0) 958 return ret; 959 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) 960 break; 961 nfs4_schedule_state_recovery(clp); 962 } 963 return 0; 964 } 965 966 /* 967 * OPEN_EXPIRED: 968 * reclaim state on the server after a network partition. 969 * Assumes caller holds the appropriate lock 970 */ 971 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 972 { 973 struct nfs4_opendata *opendata; 974 int ret; 975 976 opendata = nfs4_open_recoverdata_alloc(ctx, state); 977 if (IS_ERR(opendata)) 978 return PTR_ERR(opendata); 979 ret = nfs4_open_recover(opendata, state); 980 if (ret == -ESTALE) { 981 /* Invalidate the state owner so we don't ever use it again */ 982 nfs4_drop_state_owner(state->owner); 983 d_drop(ctx->path.dentry); 984 } 985 nfs4_opendata_put(opendata); 986 return ret; 987 } 988 989 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 990 { 991 struct nfs_server *server = NFS_SERVER(state->inode); 992 struct nfs4_exception exception = { }; 993 int err; 994 995 do { 996 err = _nfs4_open_expired(ctx, state); 997 if (err == -NFS4ERR_DELAY) 998 nfs4_handle_exception(server, err, &exception); 999 } while (exception.retry); 1000 return err; 1001 } 1002 1003 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 1004 { 1005 struct nfs_open_context *ctx; 1006 int ret; 1007 1008 ctx = nfs4_state_find_open_context(state); 1009 if (IS_ERR(ctx)) 1010 return PTR_ERR(ctx); 1011 ret = nfs4_do_open_expired(ctx, state); 1012 put_nfs_open_context(ctx); 1013 return ret; 1014 } 1015 1016 /* 1017 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 1018 * fields corresponding to attributes that were used to store the verifier. 1019 * Make sure we clobber those fields in the later setattr call 1020 */ 1021 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr) 1022 { 1023 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 1024 !(sattr->ia_valid & ATTR_ATIME_SET)) 1025 sattr->ia_valid |= ATTR_ATIME; 1026 1027 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 1028 !(sattr->ia_valid & ATTR_MTIME_SET)) 1029 sattr->ia_valid |= ATTR_MTIME; 1030 } 1031 1032 /* 1033 * Returns a referenced nfs4_state 1034 */ 1035 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res) 1036 { 1037 struct nfs4_state_owner *sp; 1038 struct nfs4_state *state = NULL; 1039 struct nfs_server *server = NFS_SERVER(dir); 1040 struct nfs_client *clp = server->nfs_client; 1041 struct nfs4_opendata *opendata; 1042 int status; 1043 1044 /* Protect against reboot recovery conflicts */ 1045 status = -ENOMEM; 1046 if (!(sp = nfs4_get_state_owner(server, cred))) { 1047 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 1048 goto out_err; 1049 } 1050 status = nfs4_recover_expired_lease(server); 1051 if (status != 0) 1052 goto err_put_state_owner; 1053 if (path->dentry->d_inode != NULL) 1054 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE)); 1055 down_read(&clp->cl_sem); 1056 status = -ENOMEM; 1057 opendata = nfs4_opendata_alloc(path, sp, flags, sattr); 1058 if (opendata == NULL) 1059 goto err_release_rwsem; 1060 1061 if (path->dentry->d_inode != NULL) 1062 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp); 1063 1064 status = _nfs4_proc_open(opendata); 1065 if (status != 0) 1066 goto err_opendata_put; 1067 1068 if (opendata->o_arg.open_flags & O_EXCL) 1069 nfs4_exclusive_attrset(opendata, sattr); 1070 1071 state = nfs4_opendata_to_nfs4_state(opendata); 1072 status = PTR_ERR(state); 1073 if (IS_ERR(state)) 1074 goto err_opendata_put; 1075 nfs4_opendata_put(opendata); 1076 nfs4_put_state_owner(sp); 1077 up_read(&clp->cl_sem); 1078 *res = state; 1079 return 0; 1080 err_opendata_put: 1081 nfs4_opendata_put(opendata); 1082 err_release_rwsem: 1083 up_read(&clp->cl_sem); 1084 err_put_state_owner: 1085 nfs4_put_state_owner(sp); 1086 out_err: 1087 *res = NULL; 1088 return status; 1089 } 1090 1091 1092 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred) 1093 { 1094 struct nfs4_exception exception = { }; 1095 struct nfs4_state *res; 1096 int status; 1097 1098 do { 1099 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res); 1100 if (status == 0) 1101 break; 1102 /* NOTE: BAD_SEQID means the server and client disagree about the 1103 * book-keeping w.r.t. state-changing operations 1104 * (OPEN/CLOSE/LOCK/LOCKU...) 1105 * It is actually a sign of a bug on the client or on the server. 1106 * 1107 * If we receive a BAD_SEQID error in the particular case of 1108 * doing an OPEN, we assume that nfs_increment_open_seqid() will 1109 * have unhashed the old state_owner for us, and that we can 1110 * therefore safely retry using a new one. We should still warn 1111 * the user though... 1112 */ 1113 if (status == -NFS4ERR_BAD_SEQID) { 1114 printk(KERN_WARNING "NFS: v4 server %s " 1115 " returned a bad sequence-id error!\n", 1116 NFS_SERVER(dir)->nfs_client->cl_hostname); 1117 exception.retry = 1; 1118 continue; 1119 } 1120 /* 1121 * BAD_STATEID on OPEN means that the server cancelled our 1122 * state before it received the OPEN_CONFIRM. 1123 * Recover by retrying the request as per the discussion 1124 * on Page 181 of RFC3530. 1125 */ 1126 if (status == -NFS4ERR_BAD_STATEID) { 1127 exception.retry = 1; 1128 continue; 1129 } 1130 if (status == -EAGAIN) { 1131 /* We must have found a delegation */ 1132 exception.retry = 1; 1133 continue; 1134 } 1135 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir), 1136 status, &exception)); 1137 } while (exception.retry); 1138 return res; 1139 } 1140 1141 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr, 1142 struct iattr *sattr, struct nfs4_state *state) 1143 { 1144 struct nfs_server *server = NFS_SERVER(inode); 1145 struct nfs_setattrargs arg = { 1146 .fh = NFS_FH(inode), 1147 .iap = sattr, 1148 .server = server, 1149 .bitmask = server->attr_bitmask, 1150 }; 1151 struct nfs_setattrres res = { 1152 .fattr = fattr, 1153 .server = server, 1154 }; 1155 struct rpc_message msg = { 1156 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 1157 .rpc_argp = &arg, 1158 .rpc_resp = &res, 1159 }; 1160 unsigned long timestamp = jiffies; 1161 int status; 1162 1163 nfs_fattr_init(fattr); 1164 1165 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) { 1166 /* Use that stateid */ 1167 } else if (state != NULL) { 1168 msg.rpc_cred = state->owner->so_cred; 1169 nfs4_copy_stateid(&arg.stateid, state, current->files); 1170 } else 1171 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid)); 1172 1173 status = rpc_call_sync(server->client, &msg, 0); 1174 if (status == 0 && state != NULL) 1175 renew_lease(server, timestamp); 1176 return status; 1177 } 1178 1179 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr, 1180 struct iattr *sattr, struct nfs4_state *state) 1181 { 1182 struct nfs_server *server = NFS_SERVER(inode); 1183 struct nfs4_exception exception = { }; 1184 int err; 1185 do { 1186 err = nfs4_handle_exception(server, 1187 _nfs4_do_setattr(inode, fattr, sattr, state), 1188 &exception); 1189 } while (exception.retry); 1190 return err; 1191 } 1192 1193 struct nfs4_closedata { 1194 struct path path; 1195 struct inode *inode; 1196 struct nfs4_state *state; 1197 struct nfs_closeargs arg; 1198 struct nfs_closeres res; 1199 struct nfs_fattr fattr; 1200 unsigned long timestamp; 1201 }; 1202 1203 static void nfs4_free_closedata(void *data) 1204 { 1205 struct nfs4_closedata *calldata = data; 1206 struct nfs4_state_owner *sp = calldata->state->owner; 1207 1208 nfs4_put_open_state(calldata->state); 1209 nfs_free_seqid(calldata->arg.seqid); 1210 nfs4_put_state_owner(sp); 1211 dput(calldata->path.dentry); 1212 mntput(calldata->path.mnt); 1213 kfree(calldata); 1214 } 1215 1216 static void nfs4_close_done(struct rpc_task *task, void *data) 1217 { 1218 struct nfs4_closedata *calldata = data; 1219 struct nfs4_state *state = calldata->state; 1220 struct nfs_server *server = NFS_SERVER(calldata->inode); 1221 1222 if (RPC_ASSASSINATED(task)) 1223 return; 1224 /* hmm. we are done with the inode, and in the process of freeing 1225 * the state_owner. we keep this around to process errors 1226 */ 1227 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid); 1228 switch (task->tk_status) { 1229 case 0: 1230 nfs_set_open_stateid(state, &calldata->res.stateid, 0); 1231 renew_lease(server, calldata->timestamp); 1232 break; 1233 case -NFS4ERR_STALE_STATEID: 1234 case -NFS4ERR_EXPIRED: 1235 break; 1236 default: 1237 if (nfs4_async_handle_error(task, server) == -EAGAIN) { 1238 rpc_restart_call(task); 1239 return; 1240 } 1241 } 1242 nfs_refresh_inode(calldata->inode, calldata->res.fattr); 1243 } 1244 1245 static void nfs4_close_prepare(struct rpc_task *task, void *data) 1246 { 1247 struct nfs4_closedata *calldata = data; 1248 struct nfs4_state *state = calldata->state; 1249 struct rpc_message msg = { 1250 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 1251 .rpc_argp = &calldata->arg, 1252 .rpc_resp = &calldata->res, 1253 .rpc_cred = state->owner->so_cred, 1254 }; 1255 int clear_rd, clear_wr, clear_rdwr; 1256 1257 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 1258 return; 1259 1260 clear_rd = clear_wr = clear_rdwr = 0; 1261 spin_lock(&state->owner->so_lock); 1262 /* Calculate the change in open mode */ 1263 if (state->n_rdwr == 0) { 1264 if (state->n_rdonly == 0) { 1265 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1266 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags); 1267 } 1268 if (state->n_wronly == 0) { 1269 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1270 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags); 1271 } 1272 } 1273 spin_unlock(&state->owner->so_lock); 1274 if (!clear_rd && !clear_wr && !clear_rdwr) { 1275 /* Note: exit _without_ calling nfs4_close_done */ 1276 task->tk_action = NULL; 1277 return; 1278 } 1279 nfs_fattr_init(calldata->res.fattr); 1280 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) { 1281 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 1282 calldata->arg.open_flags = FMODE_READ; 1283 } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) { 1284 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 1285 calldata->arg.open_flags = FMODE_WRITE; 1286 } 1287 calldata->timestamp = jiffies; 1288 rpc_call_setup(task, &msg, 0); 1289 } 1290 1291 static const struct rpc_call_ops nfs4_close_ops = { 1292 .rpc_call_prepare = nfs4_close_prepare, 1293 .rpc_call_done = nfs4_close_done, 1294 .rpc_release = nfs4_free_closedata, 1295 }; 1296 1297 /* 1298 * It is possible for data to be read/written from a mem-mapped file 1299 * after the sys_close call (which hits the vfs layer as a flush). 1300 * This means that we can't safely call nfsv4 close on a file until 1301 * the inode is cleared. This in turn means that we are not good 1302 * NFSv4 citizens - we do not indicate to the server to update the file's 1303 * share state even when we are done with one of the three share 1304 * stateid's in the inode. 1305 * 1306 * NOTE: Caller must be holding the sp->so_owner semaphore! 1307 */ 1308 int nfs4_do_close(struct path *path, struct nfs4_state *state) 1309 { 1310 struct nfs_server *server = NFS_SERVER(state->inode); 1311 struct nfs4_closedata *calldata; 1312 struct nfs4_state_owner *sp = state->owner; 1313 struct rpc_task *task; 1314 int status = -ENOMEM; 1315 1316 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL); 1317 if (calldata == NULL) 1318 goto out; 1319 calldata->inode = state->inode; 1320 calldata->state = state; 1321 calldata->arg.fh = NFS_FH(state->inode); 1322 calldata->arg.stateid = &state->open_stateid; 1323 /* Serialization for the sequence id */ 1324 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid); 1325 if (calldata->arg.seqid == NULL) 1326 goto out_free_calldata; 1327 calldata->arg.bitmask = server->attr_bitmask; 1328 calldata->res.fattr = &calldata->fattr; 1329 calldata->res.server = server; 1330 calldata->path.mnt = mntget(path->mnt); 1331 calldata->path.dentry = dget(path->dentry); 1332 1333 task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata); 1334 if (IS_ERR(task)) 1335 return PTR_ERR(task); 1336 rpc_put_task(task); 1337 return 0; 1338 out_free_calldata: 1339 kfree(calldata); 1340 out: 1341 nfs4_put_open_state(state); 1342 nfs4_put_state_owner(sp); 1343 return status; 1344 } 1345 1346 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state) 1347 { 1348 struct file *filp; 1349 int ret; 1350 1351 /* If the open_intent is for execute, we have an extra check to make */ 1352 if (nd->intent.open.flags & FMODE_EXEC) { 1353 ret = nfs_may_open(state->inode, 1354 state->owner->so_cred, 1355 nd->intent.open.flags); 1356 if (ret < 0) 1357 goto out_close; 1358 } 1359 filp = lookup_instantiate_filp(nd, path->dentry, NULL); 1360 if (!IS_ERR(filp)) { 1361 struct nfs_open_context *ctx; 1362 ctx = nfs_file_open_context(filp); 1363 ctx->state = state; 1364 return 0; 1365 } 1366 ret = PTR_ERR(filp); 1367 out_close: 1368 nfs4_close_state(path, state, nd->intent.open.flags); 1369 return ret; 1370 } 1371 1372 struct dentry * 1373 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 1374 { 1375 struct path path = { 1376 .mnt = nd->mnt, 1377 .dentry = dentry, 1378 }; 1379 struct iattr attr; 1380 struct rpc_cred *cred; 1381 struct nfs4_state *state; 1382 struct dentry *res; 1383 1384 if (nd->flags & LOOKUP_CREATE) { 1385 attr.ia_mode = nd->intent.open.create_mode; 1386 attr.ia_valid = ATTR_MODE; 1387 if (!IS_POSIXACL(dir)) 1388 attr.ia_mode &= ~current->fs->umask; 1389 } else { 1390 attr.ia_valid = 0; 1391 BUG_ON(nd->intent.open.flags & O_CREAT); 1392 } 1393 1394 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0); 1395 if (IS_ERR(cred)) 1396 return (struct dentry *)cred; 1397 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred); 1398 put_rpccred(cred); 1399 if (IS_ERR(state)) { 1400 if (PTR_ERR(state) == -ENOENT) { 1401 d_add(dentry, NULL); 1402 nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 1403 } 1404 return (struct dentry *)state; 1405 } 1406 res = d_add_unique(dentry, igrab(state->inode)); 1407 if (res != NULL) 1408 path.dentry = res; 1409 nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir)); 1410 nfs4_intent_set_file(nd, &path, state); 1411 return res; 1412 } 1413 1414 int 1415 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd) 1416 { 1417 struct path path = { 1418 .mnt = nd->mnt, 1419 .dentry = dentry, 1420 }; 1421 struct rpc_cred *cred; 1422 struct nfs4_state *state; 1423 1424 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0); 1425 if (IS_ERR(cred)) 1426 return PTR_ERR(cred); 1427 state = nfs4_do_open(dir, &path, openflags, NULL, cred); 1428 put_rpccred(cred); 1429 if (IS_ERR(state)) { 1430 switch (PTR_ERR(state)) { 1431 case -EPERM: 1432 case -EACCES: 1433 case -EDQUOT: 1434 case -ENOSPC: 1435 case -EROFS: 1436 lookup_instantiate_filp(nd, (struct dentry *)state, NULL); 1437 return 1; 1438 default: 1439 goto out_drop; 1440 } 1441 } 1442 if (state->inode == dentry->d_inode) { 1443 nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 1444 nfs4_intent_set_file(nd, &path, state); 1445 return 1; 1446 } 1447 nfs4_close_state(&path, state, openflags); 1448 out_drop: 1449 d_drop(dentry); 1450 return 0; 1451 } 1452 1453 1454 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 1455 { 1456 struct nfs4_server_caps_res res = {}; 1457 struct rpc_message msg = { 1458 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 1459 .rpc_argp = fhandle, 1460 .rpc_resp = &res, 1461 }; 1462 int status; 1463 1464 status = rpc_call_sync(server->client, &msg, 0); 1465 if (status == 0) { 1466 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 1467 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL) 1468 server->caps |= NFS_CAP_ACLS; 1469 if (res.has_links != 0) 1470 server->caps |= NFS_CAP_HARDLINKS; 1471 if (res.has_symlinks != 0) 1472 server->caps |= NFS_CAP_SYMLINKS; 1473 server->acl_bitmask = res.acl_bitmask; 1474 } 1475 return status; 1476 } 1477 1478 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 1479 { 1480 struct nfs4_exception exception = { }; 1481 int err; 1482 do { 1483 err = nfs4_handle_exception(server, 1484 _nfs4_server_capabilities(server, fhandle), 1485 &exception); 1486 } while (exception.retry); 1487 return err; 1488 } 1489 1490 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 1491 struct nfs_fsinfo *info) 1492 { 1493 struct nfs4_lookup_root_arg args = { 1494 .bitmask = nfs4_fattr_bitmap, 1495 }; 1496 struct nfs4_lookup_res res = { 1497 .server = server, 1498 .fattr = info->fattr, 1499 .fh = fhandle, 1500 }; 1501 struct rpc_message msg = { 1502 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 1503 .rpc_argp = &args, 1504 .rpc_resp = &res, 1505 }; 1506 nfs_fattr_init(info->fattr); 1507 return rpc_call_sync(server->client, &msg, 0); 1508 } 1509 1510 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 1511 struct nfs_fsinfo *info) 1512 { 1513 struct nfs4_exception exception = { }; 1514 int err; 1515 do { 1516 err = nfs4_handle_exception(server, 1517 _nfs4_lookup_root(server, fhandle, info), 1518 &exception); 1519 } while (exception.retry); 1520 return err; 1521 } 1522 1523 /* 1524 * get the file handle for the "/" directory on the server 1525 */ 1526 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, 1527 struct nfs_fsinfo *info) 1528 { 1529 int status; 1530 1531 status = nfs4_lookup_root(server, fhandle, info); 1532 if (status == 0) 1533 status = nfs4_server_capabilities(server, fhandle); 1534 if (status == 0) 1535 status = nfs4_do_fsinfo(server, fhandle, info); 1536 return nfs4_map_errors(status); 1537 } 1538 1539 /* 1540 * Get locations and (maybe) other attributes of a referral. 1541 * Note that we'll actually follow the referral later when 1542 * we detect fsid mismatch in inode revalidation 1543 */ 1544 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle) 1545 { 1546 int status = -ENOMEM; 1547 struct page *page = NULL; 1548 struct nfs4_fs_locations *locations = NULL; 1549 1550 page = alloc_page(GFP_KERNEL); 1551 if (page == NULL) 1552 goto out; 1553 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 1554 if (locations == NULL) 1555 goto out; 1556 1557 status = nfs4_proc_fs_locations(dir, name, locations, page); 1558 if (status != 0) 1559 goto out; 1560 /* Make sure server returned a different fsid for the referral */ 1561 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 1562 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name); 1563 status = -EIO; 1564 goto out; 1565 } 1566 1567 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 1568 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL; 1569 if (!fattr->mode) 1570 fattr->mode = S_IFDIR; 1571 memset(fhandle, 0, sizeof(struct nfs_fh)); 1572 out: 1573 if (page) 1574 __free_page(page); 1575 if (locations) 1576 kfree(locations); 1577 return status; 1578 } 1579 1580 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1581 { 1582 struct nfs4_getattr_arg args = { 1583 .fh = fhandle, 1584 .bitmask = server->attr_bitmask, 1585 }; 1586 struct nfs4_getattr_res res = { 1587 .fattr = fattr, 1588 .server = server, 1589 }; 1590 struct rpc_message msg = { 1591 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 1592 .rpc_argp = &args, 1593 .rpc_resp = &res, 1594 }; 1595 1596 nfs_fattr_init(fattr); 1597 return rpc_call_sync(server->client, &msg, 0); 1598 } 1599 1600 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1601 { 1602 struct nfs4_exception exception = { }; 1603 int err; 1604 do { 1605 err = nfs4_handle_exception(server, 1606 _nfs4_proc_getattr(server, fhandle, fattr), 1607 &exception); 1608 } while (exception.retry); 1609 return err; 1610 } 1611 1612 /* 1613 * The file is not closed if it is opened due to the a request to change 1614 * the size of the file. The open call will not be needed once the 1615 * VFS layer lookup-intents are implemented. 1616 * 1617 * Close is called when the inode is destroyed. 1618 * If we haven't opened the file for O_WRONLY, we 1619 * need to in the size_change case to obtain a stateid. 1620 * 1621 * Got race? 1622 * Because OPEN is always done by name in nfsv4, it is 1623 * possible that we opened a different file by the same 1624 * name. We can recognize this race condition, but we 1625 * can't do anything about it besides returning an error. 1626 * 1627 * This will be fixed with VFS changes (lookup-intent). 1628 */ 1629 static int 1630 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 1631 struct iattr *sattr) 1632 { 1633 struct rpc_cred *cred; 1634 struct inode *inode = dentry->d_inode; 1635 struct nfs_open_context *ctx; 1636 struct nfs4_state *state = NULL; 1637 int status; 1638 1639 nfs_fattr_init(fattr); 1640 1641 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); 1642 if (IS_ERR(cred)) 1643 return PTR_ERR(cred); 1644 1645 /* Search for an existing open(O_WRITE) file */ 1646 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE); 1647 if (ctx != NULL) 1648 state = ctx->state; 1649 1650 status = nfs4_do_setattr(inode, fattr, sattr, state); 1651 if (status == 0) 1652 nfs_setattr_update_inode(inode, sattr); 1653 if (ctx != NULL) 1654 put_nfs_open_context(ctx); 1655 put_rpccred(cred); 1656 return status; 1657 } 1658 1659 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh, 1660 const struct qstr *name, struct nfs_fh *fhandle, 1661 struct nfs_fattr *fattr) 1662 { 1663 int status; 1664 struct nfs4_lookup_arg args = { 1665 .bitmask = server->attr_bitmask, 1666 .dir_fh = dirfh, 1667 .name = name, 1668 }; 1669 struct nfs4_lookup_res res = { 1670 .server = server, 1671 .fattr = fattr, 1672 .fh = fhandle, 1673 }; 1674 struct rpc_message msg = { 1675 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 1676 .rpc_argp = &args, 1677 .rpc_resp = &res, 1678 }; 1679 1680 nfs_fattr_init(fattr); 1681 1682 dprintk("NFS call lookupfh %s\n", name->name); 1683 status = rpc_call_sync(server->client, &msg, 0); 1684 dprintk("NFS reply lookupfh: %d\n", status); 1685 return status; 1686 } 1687 1688 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh, 1689 struct qstr *name, struct nfs_fh *fhandle, 1690 struct nfs_fattr *fattr) 1691 { 1692 struct nfs4_exception exception = { }; 1693 int err; 1694 do { 1695 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr); 1696 /* FIXME: !!!! */ 1697 if (err == -NFS4ERR_MOVED) { 1698 err = -EREMOTE; 1699 break; 1700 } 1701 err = nfs4_handle_exception(server, err, &exception); 1702 } while (exception.retry); 1703 return err; 1704 } 1705 1706 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, 1707 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1708 { 1709 int status; 1710 1711 dprintk("NFS call lookup %s\n", name->name); 1712 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr); 1713 if (status == -NFS4ERR_MOVED) 1714 status = nfs4_get_referral(dir, name, fattr, fhandle); 1715 dprintk("NFS reply lookup: %d\n", status); 1716 return status; 1717 } 1718 1719 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1720 { 1721 struct nfs4_exception exception = { }; 1722 int err; 1723 do { 1724 err = nfs4_handle_exception(NFS_SERVER(dir), 1725 _nfs4_proc_lookup(dir, name, fhandle, fattr), 1726 &exception); 1727 } while (exception.retry); 1728 return err; 1729 } 1730 1731 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 1732 { 1733 struct nfs_server *server = NFS_SERVER(inode); 1734 struct nfs_fattr fattr; 1735 struct nfs4_accessargs args = { 1736 .fh = NFS_FH(inode), 1737 .bitmask = server->attr_bitmask, 1738 }; 1739 struct nfs4_accessres res = { 1740 .server = server, 1741 .fattr = &fattr, 1742 }; 1743 struct rpc_message msg = { 1744 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 1745 .rpc_argp = &args, 1746 .rpc_resp = &res, 1747 .rpc_cred = entry->cred, 1748 }; 1749 int mode = entry->mask; 1750 int status; 1751 1752 /* 1753 * Determine which access bits we want to ask for... 1754 */ 1755 if (mode & MAY_READ) 1756 args.access |= NFS4_ACCESS_READ; 1757 if (S_ISDIR(inode->i_mode)) { 1758 if (mode & MAY_WRITE) 1759 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; 1760 if (mode & MAY_EXEC) 1761 args.access |= NFS4_ACCESS_LOOKUP; 1762 } else { 1763 if (mode & MAY_WRITE) 1764 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; 1765 if (mode & MAY_EXEC) 1766 args.access |= NFS4_ACCESS_EXECUTE; 1767 } 1768 nfs_fattr_init(&fattr); 1769 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 1770 if (!status) { 1771 entry->mask = 0; 1772 if (res.access & NFS4_ACCESS_READ) 1773 entry->mask |= MAY_READ; 1774 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) 1775 entry->mask |= MAY_WRITE; 1776 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) 1777 entry->mask |= MAY_EXEC; 1778 nfs_refresh_inode(inode, &fattr); 1779 } 1780 return status; 1781 } 1782 1783 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 1784 { 1785 struct nfs4_exception exception = { }; 1786 int err; 1787 do { 1788 err = nfs4_handle_exception(NFS_SERVER(inode), 1789 _nfs4_proc_access(inode, entry), 1790 &exception); 1791 } while (exception.retry); 1792 return err; 1793 } 1794 1795 /* 1796 * TODO: For the time being, we don't try to get any attributes 1797 * along with any of the zero-copy operations READ, READDIR, 1798 * READLINK, WRITE. 1799 * 1800 * In the case of the first three, we want to put the GETATTR 1801 * after the read-type operation -- this is because it is hard 1802 * to predict the length of a GETATTR response in v4, and thus 1803 * align the READ data correctly. This means that the GETATTR 1804 * may end up partially falling into the page cache, and we should 1805 * shift it into the 'tail' of the xdr_buf before processing. 1806 * To do this efficiently, we need to know the total length 1807 * of data received, which doesn't seem to be available outside 1808 * of the RPC layer. 1809 * 1810 * In the case of WRITE, we also want to put the GETATTR after 1811 * the operation -- in this case because we want to make sure 1812 * we get the post-operation mtime and size. This means that 1813 * we can't use xdr_encode_pages() as written: we need a variant 1814 * of it which would leave room in the 'tail' iovec. 1815 * 1816 * Both of these changes to the XDR layer would in fact be quite 1817 * minor, but I decided to leave them for a subsequent patch. 1818 */ 1819 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 1820 unsigned int pgbase, unsigned int pglen) 1821 { 1822 struct nfs4_readlink args = { 1823 .fh = NFS_FH(inode), 1824 .pgbase = pgbase, 1825 .pglen = pglen, 1826 .pages = &page, 1827 }; 1828 struct rpc_message msg = { 1829 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 1830 .rpc_argp = &args, 1831 .rpc_resp = NULL, 1832 }; 1833 1834 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 1835 } 1836 1837 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 1838 unsigned int pgbase, unsigned int pglen) 1839 { 1840 struct nfs4_exception exception = { }; 1841 int err; 1842 do { 1843 err = nfs4_handle_exception(NFS_SERVER(inode), 1844 _nfs4_proc_readlink(inode, page, pgbase, pglen), 1845 &exception); 1846 } while (exception.retry); 1847 return err; 1848 } 1849 1850 /* 1851 * Got race? 1852 * We will need to arrange for the VFS layer to provide an atomic open. 1853 * Until then, this create/open method is prone to inefficiency and race 1854 * conditions due to the lookup, create, and open VFS calls from sys_open() 1855 * placed on the wire. 1856 * 1857 * Given the above sorry state of affairs, I'm simply sending an OPEN. 1858 * The file will be opened again in the subsequent VFS open call 1859 * (nfs4_proc_file_open). 1860 * 1861 * The open for read will just hang around to be used by any process that 1862 * opens the file O_RDONLY. This will all be resolved with the VFS changes. 1863 */ 1864 1865 static int 1866 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 1867 int flags, struct nameidata *nd) 1868 { 1869 struct path path = { 1870 .mnt = nd->mnt, 1871 .dentry = dentry, 1872 }; 1873 struct nfs4_state *state; 1874 struct rpc_cred *cred; 1875 int status = 0; 1876 1877 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0); 1878 if (IS_ERR(cred)) { 1879 status = PTR_ERR(cred); 1880 goto out; 1881 } 1882 state = nfs4_do_open(dir, &path, flags, sattr, cred); 1883 put_rpccred(cred); 1884 d_drop(dentry); 1885 if (IS_ERR(state)) { 1886 status = PTR_ERR(state); 1887 goto out; 1888 } 1889 d_add(dentry, igrab(state->inode)); 1890 nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 1891 if (flags & O_EXCL) { 1892 struct nfs_fattr fattr; 1893 status = nfs4_do_setattr(state->inode, &fattr, sattr, state); 1894 if (status == 0) 1895 nfs_setattr_update_inode(state->inode, sattr); 1896 nfs_post_op_update_inode(state->inode, &fattr); 1897 } 1898 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0) 1899 status = nfs4_intent_set_file(nd, &path, state); 1900 else 1901 nfs4_close_state(&path, state, flags); 1902 out: 1903 return status; 1904 } 1905 1906 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) 1907 { 1908 struct nfs_server *server = NFS_SERVER(dir); 1909 struct nfs_removeargs args = { 1910 .fh = NFS_FH(dir), 1911 .name.len = name->len, 1912 .name.name = name->name, 1913 .bitmask = server->attr_bitmask, 1914 }; 1915 struct nfs_removeres res = { 1916 .server = server, 1917 }; 1918 struct rpc_message msg = { 1919 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 1920 .rpc_argp = &args, 1921 .rpc_resp = &res, 1922 }; 1923 int status; 1924 1925 nfs_fattr_init(&res.dir_attr); 1926 status = rpc_call_sync(server->client, &msg, 0); 1927 if (status == 0) { 1928 update_changeattr(dir, &res.cinfo); 1929 nfs_post_op_update_inode(dir, &res.dir_attr); 1930 } 1931 return status; 1932 } 1933 1934 static int nfs4_proc_remove(struct inode *dir, struct qstr *name) 1935 { 1936 struct nfs4_exception exception = { }; 1937 int err; 1938 do { 1939 err = nfs4_handle_exception(NFS_SERVER(dir), 1940 _nfs4_proc_remove(dir, name), 1941 &exception); 1942 } while (exception.retry); 1943 return err; 1944 } 1945 1946 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 1947 { 1948 struct nfs_server *server = NFS_SERVER(dir); 1949 struct nfs_removeargs *args = msg->rpc_argp; 1950 struct nfs_removeres *res = msg->rpc_resp; 1951 1952 args->bitmask = server->attr_bitmask; 1953 res->server = server; 1954 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 1955 } 1956 1957 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 1958 { 1959 struct nfs_removeres *res = task->tk_msg.rpc_resp; 1960 1961 if (nfs4_async_handle_error(task, res->server) == -EAGAIN) 1962 return 0; 1963 update_changeattr(dir, &res->cinfo); 1964 nfs_post_op_update_inode(dir, &res->dir_attr); 1965 return 1; 1966 } 1967 1968 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, 1969 struct inode *new_dir, struct qstr *new_name) 1970 { 1971 struct nfs_server *server = NFS_SERVER(old_dir); 1972 struct nfs4_rename_arg arg = { 1973 .old_dir = NFS_FH(old_dir), 1974 .new_dir = NFS_FH(new_dir), 1975 .old_name = old_name, 1976 .new_name = new_name, 1977 .bitmask = server->attr_bitmask, 1978 }; 1979 struct nfs_fattr old_fattr, new_fattr; 1980 struct nfs4_rename_res res = { 1981 .server = server, 1982 .old_fattr = &old_fattr, 1983 .new_fattr = &new_fattr, 1984 }; 1985 struct rpc_message msg = { 1986 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME], 1987 .rpc_argp = &arg, 1988 .rpc_resp = &res, 1989 }; 1990 int status; 1991 1992 nfs_fattr_init(res.old_fattr); 1993 nfs_fattr_init(res.new_fattr); 1994 status = rpc_call_sync(server->client, &msg, 0); 1995 1996 if (!status) { 1997 update_changeattr(old_dir, &res.old_cinfo); 1998 nfs_post_op_update_inode(old_dir, res.old_fattr); 1999 update_changeattr(new_dir, &res.new_cinfo); 2000 nfs_post_op_update_inode(new_dir, res.new_fattr); 2001 } 2002 return status; 2003 } 2004 2005 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, 2006 struct inode *new_dir, struct qstr *new_name) 2007 { 2008 struct nfs4_exception exception = { }; 2009 int err; 2010 do { 2011 err = nfs4_handle_exception(NFS_SERVER(old_dir), 2012 _nfs4_proc_rename(old_dir, old_name, 2013 new_dir, new_name), 2014 &exception); 2015 } while (exception.retry); 2016 return err; 2017 } 2018 2019 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 2020 { 2021 struct nfs_server *server = NFS_SERVER(inode); 2022 struct nfs4_link_arg arg = { 2023 .fh = NFS_FH(inode), 2024 .dir_fh = NFS_FH(dir), 2025 .name = name, 2026 .bitmask = server->attr_bitmask, 2027 }; 2028 struct nfs_fattr fattr, dir_attr; 2029 struct nfs4_link_res res = { 2030 .server = server, 2031 .fattr = &fattr, 2032 .dir_attr = &dir_attr, 2033 }; 2034 struct rpc_message msg = { 2035 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 2036 .rpc_argp = &arg, 2037 .rpc_resp = &res, 2038 }; 2039 int status; 2040 2041 nfs_fattr_init(res.fattr); 2042 nfs_fattr_init(res.dir_attr); 2043 status = rpc_call_sync(server->client, &msg, 0); 2044 if (!status) { 2045 update_changeattr(dir, &res.cinfo); 2046 nfs_post_op_update_inode(dir, res.dir_attr); 2047 nfs_post_op_update_inode(inode, res.fattr); 2048 } 2049 2050 return status; 2051 } 2052 2053 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 2054 { 2055 struct nfs4_exception exception = { }; 2056 int err; 2057 do { 2058 err = nfs4_handle_exception(NFS_SERVER(inode), 2059 _nfs4_proc_link(inode, dir, name), 2060 &exception); 2061 } while (exception.retry); 2062 return err; 2063 } 2064 2065 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 2066 struct page *page, unsigned int len, struct iattr *sattr) 2067 { 2068 struct nfs_server *server = NFS_SERVER(dir); 2069 struct nfs_fh fhandle; 2070 struct nfs_fattr fattr, dir_fattr; 2071 struct nfs4_create_arg arg = { 2072 .dir_fh = NFS_FH(dir), 2073 .server = server, 2074 .name = &dentry->d_name, 2075 .attrs = sattr, 2076 .ftype = NF4LNK, 2077 .bitmask = server->attr_bitmask, 2078 }; 2079 struct nfs4_create_res res = { 2080 .server = server, 2081 .fh = &fhandle, 2082 .fattr = &fattr, 2083 .dir_fattr = &dir_fattr, 2084 }; 2085 struct rpc_message msg = { 2086 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK], 2087 .rpc_argp = &arg, 2088 .rpc_resp = &res, 2089 }; 2090 int status; 2091 2092 if (len > NFS4_MAXPATHLEN) 2093 return -ENAMETOOLONG; 2094 2095 arg.u.symlink.pages = &page; 2096 arg.u.symlink.len = len; 2097 nfs_fattr_init(&fattr); 2098 nfs_fattr_init(&dir_fattr); 2099 2100 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 2101 if (!status) { 2102 update_changeattr(dir, &res.dir_cinfo); 2103 nfs_post_op_update_inode(dir, res.dir_fattr); 2104 status = nfs_instantiate(dentry, &fhandle, &fattr); 2105 } 2106 return status; 2107 } 2108 2109 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 2110 struct page *page, unsigned int len, struct iattr *sattr) 2111 { 2112 struct nfs4_exception exception = { }; 2113 int err; 2114 do { 2115 err = nfs4_handle_exception(NFS_SERVER(dir), 2116 _nfs4_proc_symlink(dir, dentry, page, 2117 len, sattr), 2118 &exception); 2119 } while (exception.retry); 2120 return err; 2121 } 2122 2123 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 2124 struct iattr *sattr) 2125 { 2126 struct nfs_server *server = NFS_SERVER(dir); 2127 struct nfs_fh fhandle; 2128 struct nfs_fattr fattr, dir_fattr; 2129 struct nfs4_create_arg arg = { 2130 .dir_fh = NFS_FH(dir), 2131 .server = server, 2132 .name = &dentry->d_name, 2133 .attrs = sattr, 2134 .ftype = NF4DIR, 2135 .bitmask = server->attr_bitmask, 2136 }; 2137 struct nfs4_create_res res = { 2138 .server = server, 2139 .fh = &fhandle, 2140 .fattr = &fattr, 2141 .dir_fattr = &dir_fattr, 2142 }; 2143 struct rpc_message msg = { 2144 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], 2145 .rpc_argp = &arg, 2146 .rpc_resp = &res, 2147 }; 2148 int status; 2149 2150 nfs_fattr_init(&fattr); 2151 nfs_fattr_init(&dir_fattr); 2152 2153 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 2154 if (!status) { 2155 update_changeattr(dir, &res.dir_cinfo); 2156 nfs_post_op_update_inode(dir, res.dir_fattr); 2157 status = nfs_instantiate(dentry, &fhandle, &fattr); 2158 } 2159 return status; 2160 } 2161 2162 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 2163 struct iattr *sattr) 2164 { 2165 struct nfs4_exception exception = { }; 2166 int err; 2167 do { 2168 err = nfs4_handle_exception(NFS_SERVER(dir), 2169 _nfs4_proc_mkdir(dir, dentry, sattr), 2170 &exception); 2171 } while (exception.retry); 2172 return err; 2173 } 2174 2175 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 2176 u64 cookie, struct page *page, unsigned int count, int plus) 2177 { 2178 struct inode *dir = dentry->d_inode; 2179 struct nfs4_readdir_arg args = { 2180 .fh = NFS_FH(dir), 2181 .pages = &page, 2182 .pgbase = 0, 2183 .count = count, 2184 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, 2185 }; 2186 struct nfs4_readdir_res res; 2187 struct rpc_message msg = { 2188 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 2189 .rpc_argp = &args, 2190 .rpc_resp = &res, 2191 .rpc_cred = cred, 2192 }; 2193 int status; 2194 2195 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__, 2196 dentry->d_parent->d_name.name, 2197 dentry->d_name.name, 2198 (unsigned long long)cookie); 2199 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args); 2200 res.pgbase = args.pgbase; 2201 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 2202 if (status == 0) 2203 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE); 2204 2205 nfs_invalidate_atime(dir); 2206 2207 dprintk("%s: returns %d\n", __FUNCTION__, status); 2208 return status; 2209 } 2210 2211 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 2212 u64 cookie, struct page *page, unsigned int count, int plus) 2213 { 2214 struct nfs4_exception exception = { }; 2215 int err; 2216 do { 2217 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), 2218 _nfs4_proc_readdir(dentry, cred, cookie, 2219 page, count, plus), 2220 &exception); 2221 } while (exception.retry); 2222 return err; 2223 } 2224 2225 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 2226 struct iattr *sattr, dev_t rdev) 2227 { 2228 struct nfs_server *server = NFS_SERVER(dir); 2229 struct nfs_fh fh; 2230 struct nfs_fattr fattr, dir_fattr; 2231 struct nfs4_create_arg arg = { 2232 .dir_fh = NFS_FH(dir), 2233 .server = server, 2234 .name = &dentry->d_name, 2235 .attrs = sattr, 2236 .bitmask = server->attr_bitmask, 2237 }; 2238 struct nfs4_create_res res = { 2239 .server = server, 2240 .fh = &fh, 2241 .fattr = &fattr, 2242 .dir_fattr = &dir_fattr, 2243 }; 2244 struct rpc_message msg = { 2245 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], 2246 .rpc_argp = &arg, 2247 .rpc_resp = &res, 2248 }; 2249 int status; 2250 int mode = sattr->ia_mode; 2251 2252 nfs_fattr_init(&fattr); 2253 nfs_fattr_init(&dir_fattr); 2254 2255 BUG_ON(!(sattr->ia_valid & ATTR_MODE)); 2256 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode)); 2257 if (S_ISFIFO(mode)) 2258 arg.ftype = NF4FIFO; 2259 else if (S_ISBLK(mode)) { 2260 arg.ftype = NF4BLK; 2261 arg.u.device.specdata1 = MAJOR(rdev); 2262 arg.u.device.specdata2 = MINOR(rdev); 2263 } 2264 else if (S_ISCHR(mode)) { 2265 arg.ftype = NF4CHR; 2266 arg.u.device.specdata1 = MAJOR(rdev); 2267 arg.u.device.specdata2 = MINOR(rdev); 2268 } 2269 else 2270 arg.ftype = NF4SOCK; 2271 2272 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 2273 if (status == 0) { 2274 update_changeattr(dir, &res.dir_cinfo); 2275 nfs_post_op_update_inode(dir, res.dir_fattr); 2276 status = nfs_instantiate(dentry, &fh, &fattr); 2277 } 2278 return status; 2279 } 2280 2281 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 2282 struct iattr *sattr, dev_t rdev) 2283 { 2284 struct nfs4_exception exception = { }; 2285 int err; 2286 do { 2287 err = nfs4_handle_exception(NFS_SERVER(dir), 2288 _nfs4_proc_mknod(dir, dentry, sattr, rdev), 2289 &exception); 2290 } while (exception.retry); 2291 return err; 2292 } 2293 2294 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 2295 struct nfs_fsstat *fsstat) 2296 { 2297 struct nfs4_statfs_arg args = { 2298 .fh = fhandle, 2299 .bitmask = server->attr_bitmask, 2300 }; 2301 struct rpc_message msg = { 2302 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 2303 .rpc_argp = &args, 2304 .rpc_resp = fsstat, 2305 }; 2306 2307 nfs_fattr_init(fsstat->fattr); 2308 return rpc_call_sync(server->client, &msg, 0); 2309 } 2310 2311 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 2312 { 2313 struct nfs4_exception exception = { }; 2314 int err; 2315 do { 2316 err = nfs4_handle_exception(server, 2317 _nfs4_proc_statfs(server, fhandle, fsstat), 2318 &exception); 2319 } while (exception.retry); 2320 return err; 2321 } 2322 2323 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 2324 struct nfs_fsinfo *fsinfo) 2325 { 2326 struct nfs4_fsinfo_arg args = { 2327 .fh = fhandle, 2328 .bitmask = server->attr_bitmask, 2329 }; 2330 struct rpc_message msg = { 2331 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 2332 .rpc_argp = &args, 2333 .rpc_resp = fsinfo, 2334 }; 2335 2336 return rpc_call_sync(server->client, &msg, 0); 2337 } 2338 2339 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 2340 { 2341 struct nfs4_exception exception = { }; 2342 int err; 2343 2344 do { 2345 err = nfs4_handle_exception(server, 2346 _nfs4_do_fsinfo(server, fhandle, fsinfo), 2347 &exception); 2348 } while (exception.retry); 2349 return err; 2350 } 2351 2352 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 2353 { 2354 nfs_fattr_init(fsinfo->fattr); 2355 return nfs4_do_fsinfo(server, fhandle, fsinfo); 2356 } 2357 2358 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 2359 struct nfs_pathconf *pathconf) 2360 { 2361 struct nfs4_pathconf_arg args = { 2362 .fh = fhandle, 2363 .bitmask = server->attr_bitmask, 2364 }; 2365 struct rpc_message msg = { 2366 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 2367 .rpc_argp = &args, 2368 .rpc_resp = pathconf, 2369 }; 2370 2371 /* None of the pathconf attributes are mandatory to implement */ 2372 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 2373 memset(pathconf, 0, sizeof(*pathconf)); 2374 return 0; 2375 } 2376 2377 nfs_fattr_init(pathconf->fattr); 2378 return rpc_call_sync(server->client, &msg, 0); 2379 } 2380 2381 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 2382 struct nfs_pathconf *pathconf) 2383 { 2384 struct nfs4_exception exception = { }; 2385 int err; 2386 2387 do { 2388 err = nfs4_handle_exception(server, 2389 _nfs4_proc_pathconf(server, fhandle, pathconf), 2390 &exception); 2391 } while (exception.retry); 2392 return err; 2393 } 2394 2395 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data) 2396 { 2397 struct nfs_server *server = NFS_SERVER(data->inode); 2398 2399 if (nfs4_async_handle_error(task, server) == -EAGAIN) { 2400 rpc_restart_call(task); 2401 return -EAGAIN; 2402 } 2403 2404 nfs_invalidate_atime(data->inode); 2405 if (task->tk_status > 0) 2406 renew_lease(server, data->timestamp); 2407 return 0; 2408 } 2409 2410 static void nfs4_proc_read_setup(struct nfs_read_data *data) 2411 { 2412 struct rpc_message msg = { 2413 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ], 2414 .rpc_argp = &data->args, 2415 .rpc_resp = &data->res, 2416 .rpc_cred = data->cred, 2417 }; 2418 2419 data->timestamp = jiffies; 2420 2421 rpc_call_setup(&data->task, &msg, 0); 2422 } 2423 2424 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data) 2425 { 2426 struct inode *inode = data->inode; 2427 2428 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { 2429 rpc_restart_call(task); 2430 return -EAGAIN; 2431 } 2432 if (task->tk_status >= 0) { 2433 renew_lease(NFS_SERVER(inode), data->timestamp); 2434 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr); 2435 } 2436 return 0; 2437 } 2438 2439 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how) 2440 { 2441 struct rpc_message msg = { 2442 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE], 2443 .rpc_argp = &data->args, 2444 .rpc_resp = &data->res, 2445 .rpc_cred = data->cred, 2446 }; 2447 struct inode *inode = data->inode; 2448 struct nfs_server *server = NFS_SERVER(inode); 2449 int stable; 2450 2451 if (how & FLUSH_STABLE) { 2452 if (!NFS_I(inode)->ncommit) 2453 stable = NFS_FILE_SYNC; 2454 else 2455 stable = NFS_DATA_SYNC; 2456 } else 2457 stable = NFS_UNSTABLE; 2458 data->args.stable = stable; 2459 data->args.bitmask = server->attr_bitmask; 2460 data->res.server = server; 2461 2462 data->timestamp = jiffies; 2463 2464 /* Finalize the task. */ 2465 rpc_call_setup(&data->task, &msg, 0); 2466 } 2467 2468 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data) 2469 { 2470 struct inode *inode = data->inode; 2471 2472 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { 2473 rpc_restart_call(task); 2474 return -EAGAIN; 2475 } 2476 nfs_refresh_inode(inode, data->res.fattr); 2477 return 0; 2478 } 2479 2480 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how) 2481 { 2482 struct rpc_message msg = { 2483 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 2484 .rpc_argp = &data->args, 2485 .rpc_resp = &data->res, 2486 .rpc_cred = data->cred, 2487 }; 2488 struct nfs_server *server = NFS_SERVER(data->inode); 2489 2490 data->args.bitmask = server->attr_bitmask; 2491 data->res.server = server; 2492 2493 rpc_call_setup(&data->task, &msg, 0); 2494 } 2495 2496 /* 2497 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 2498 * standalone procedure for queueing an asynchronous RENEW. 2499 */ 2500 static void nfs4_renew_done(struct rpc_task *task, void *data) 2501 { 2502 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp; 2503 unsigned long timestamp = (unsigned long)data; 2504 2505 if (task->tk_status < 0) { 2506 switch (task->tk_status) { 2507 case -NFS4ERR_STALE_CLIENTID: 2508 case -NFS4ERR_EXPIRED: 2509 case -NFS4ERR_CB_PATH_DOWN: 2510 nfs4_schedule_state_recovery(clp); 2511 } 2512 return; 2513 } 2514 spin_lock(&clp->cl_lock); 2515 if (time_before(clp->cl_last_renewal,timestamp)) 2516 clp->cl_last_renewal = timestamp; 2517 spin_unlock(&clp->cl_lock); 2518 } 2519 2520 static const struct rpc_call_ops nfs4_renew_ops = { 2521 .rpc_call_done = nfs4_renew_done, 2522 }; 2523 2524 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred) 2525 { 2526 struct rpc_message msg = { 2527 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 2528 .rpc_argp = clp, 2529 .rpc_cred = cred, 2530 }; 2531 2532 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT, 2533 &nfs4_renew_ops, (void *)jiffies); 2534 } 2535 2536 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 2537 { 2538 struct rpc_message msg = { 2539 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 2540 .rpc_argp = clp, 2541 .rpc_cred = cred, 2542 }; 2543 unsigned long now = jiffies; 2544 int status; 2545 2546 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 2547 if (status < 0) 2548 return status; 2549 spin_lock(&clp->cl_lock); 2550 if (time_before(clp->cl_last_renewal,now)) 2551 clp->cl_last_renewal = now; 2552 spin_unlock(&clp->cl_lock); 2553 return 0; 2554 } 2555 2556 static inline int nfs4_server_supports_acls(struct nfs_server *server) 2557 { 2558 return (server->caps & NFS_CAP_ACLS) 2559 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 2560 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL); 2561 } 2562 2563 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that 2564 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on 2565 * the stack. 2566 */ 2567 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT) 2568 2569 static void buf_to_pages(const void *buf, size_t buflen, 2570 struct page **pages, unsigned int *pgbase) 2571 { 2572 const void *p = buf; 2573 2574 *pgbase = offset_in_page(buf); 2575 p -= *pgbase; 2576 while (p < buf + buflen) { 2577 *(pages++) = virt_to_page(p); 2578 p += PAGE_CACHE_SIZE; 2579 } 2580 } 2581 2582 struct nfs4_cached_acl { 2583 int cached; 2584 size_t len; 2585 char data[0]; 2586 }; 2587 2588 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 2589 { 2590 struct nfs_inode *nfsi = NFS_I(inode); 2591 2592 spin_lock(&inode->i_lock); 2593 kfree(nfsi->nfs4_acl); 2594 nfsi->nfs4_acl = acl; 2595 spin_unlock(&inode->i_lock); 2596 } 2597 2598 static void nfs4_zap_acl_attr(struct inode *inode) 2599 { 2600 nfs4_set_cached_acl(inode, NULL); 2601 } 2602 2603 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 2604 { 2605 struct nfs_inode *nfsi = NFS_I(inode); 2606 struct nfs4_cached_acl *acl; 2607 int ret = -ENOENT; 2608 2609 spin_lock(&inode->i_lock); 2610 acl = nfsi->nfs4_acl; 2611 if (acl == NULL) 2612 goto out; 2613 if (buf == NULL) /* user is just asking for length */ 2614 goto out_len; 2615 if (acl->cached == 0) 2616 goto out; 2617 ret = -ERANGE; /* see getxattr(2) man page */ 2618 if (acl->len > buflen) 2619 goto out; 2620 memcpy(buf, acl->data, acl->len); 2621 out_len: 2622 ret = acl->len; 2623 out: 2624 spin_unlock(&inode->i_lock); 2625 return ret; 2626 } 2627 2628 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len) 2629 { 2630 struct nfs4_cached_acl *acl; 2631 2632 if (buf && acl_len <= PAGE_SIZE) { 2633 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL); 2634 if (acl == NULL) 2635 goto out; 2636 acl->cached = 1; 2637 memcpy(acl->data, buf, acl_len); 2638 } else { 2639 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 2640 if (acl == NULL) 2641 goto out; 2642 acl->cached = 0; 2643 } 2644 acl->len = acl_len; 2645 out: 2646 nfs4_set_cached_acl(inode, acl); 2647 } 2648 2649 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 2650 { 2651 struct page *pages[NFS4ACL_MAXPAGES]; 2652 struct nfs_getaclargs args = { 2653 .fh = NFS_FH(inode), 2654 .acl_pages = pages, 2655 .acl_len = buflen, 2656 }; 2657 size_t resp_len = buflen; 2658 void *resp_buf; 2659 struct rpc_message msg = { 2660 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 2661 .rpc_argp = &args, 2662 .rpc_resp = &resp_len, 2663 }; 2664 struct page *localpage = NULL; 2665 int ret; 2666 2667 if (buflen < PAGE_SIZE) { 2668 /* As long as we're doing a round trip to the server anyway, 2669 * let's be prepared for a page of acl data. */ 2670 localpage = alloc_page(GFP_KERNEL); 2671 resp_buf = page_address(localpage); 2672 if (localpage == NULL) 2673 return -ENOMEM; 2674 args.acl_pages[0] = localpage; 2675 args.acl_pgbase = 0; 2676 resp_len = args.acl_len = PAGE_SIZE; 2677 } else { 2678 resp_buf = buf; 2679 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase); 2680 } 2681 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 2682 if (ret) 2683 goto out_free; 2684 if (resp_len > args.acl_len) 2685 nfs4_write_cached_acl(inode, NULL, resp_len); 2686 else 2687 nfs4_write_cached_acl(inode, resp_buf, resp_len); 2688 if (buf) { 2689 ret = -ERANGE; 2690 if (resp_len > buflen) 2691 goto out_free; 2692 if (localpage) 2693 memcpy(buf, resp_buf, resp_len); 2694 } 2695 ret = resp_len; 2696 out_free: 2697 if (localpage) 2698 __free_page(localpage); 2699 return ret; 2700 } 2701 2702 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 2703 { 2704 struct nfs4_exception exception = { }; 2705 ssize_t ret; 2706 do { 2707 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 2708 if (ret >= 0) 2709 break; 2710 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 2711 } while (exception.retry); 2712 return ret; 2713 } 2714 2715 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 2716 { 2717 struct nfs_server *server = NFS_SERVER(inode); 2718 int ret; 2719 2720 if (!nfs4_server_supports_acls(server)) 2721 return -EOPNOTSUPP; 2722 ret = nfs_revalidate_inode(server, inode); 2723 if (ret < 0) 2724 return ret; 2725 ret = nfs4_read_cached_acl(inode, buf, buflen); 2726 if (ret != -ENOENT) 2727 return ret; 2728 return nfs4_get_acl_uncached(inode, buf, buflen); 2729 } 2730 2731 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 2732 { 2733 struct nfs_server *server = NFS_SERVER(inode); 2734 struct page *pages[NFS4ACL_MAXPAGES]; 2735 struct nfs_setaclargs arg = { 2736 .fh = NFS_FH(inode), 2737 .acl_pages = pages, 2738 .acl_len = buflen, 2739 }; 2740 struct rpc_message msg = { 2741 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 2742 .rpc_argp = &arg, 2743 .rpc_resp = NULL, 2744 }; 2745 int ret; 2746 2747 if (!nfs4_server_supports_acls(server)) 2748 return -EOPNOTSUPP; 2749 nfs_inode_return_delegation(inode); 2750 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase); 2751 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 2752 nfs_zap_caches(inode); 2753 return ret; 2754 } 2755 2756 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 2757 { 2758 struct nfs4_exception exception = { }; 2759 int err; 2760 do { 2761 err = nfs4_handle_exception(NFS_SERVER(inode), 2762 __nfs4_proc_set_acl(inode, buf, buflen), 2763 &exception); 2764 } while (exception.retry); 2765 return err; 2766 } 2767 2768 static int 2769 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server) 2770 { 2771 struct nfs_client *clp = server->nfs_client; 2772 2773 if (!clp || task->tk_status >= 0) 2774 return 0; 2775 switch(task->tk_status) { 2776 case -NFS4ERR_STALE_CLIENTID: 2777 case -NFS4ERR_STALE_STATEID: 2778 case -NFS4ERR_EXPIRED: 2779 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL); 2780 nfs4_schedule_state_recovery(clp); 2781 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0) 2782 rpc_wake_up_task(task); 2783 task->tk_status = 0; 2784 return -EAGAIN; 2785 case -NFS4ERR_DELAY: 2786 nfs_inc_server_stats((struct nfs_server *) server, 2787 NFSIOS_DELAY); 2788 case -NFS4ERR_GRACE: 2789 rpc_delay(task, NFS4_POLL_RETRY_MAX); 2790 task->tk_status = 0; 2791 return -EAGAIN; 2792 case -NFS4ERR_OLD_STATEID: 2793 task->tk_status = 0; 2794 return -EAGAIN; 2795 } 2796 task->tk_status = nfs4_map_errors(task->tk_status); 2797 return 0; 2798 } 2799 2800 static int nfs4_wait_bit_interruptible(void *word) 2801 { 2802 if (signal_pending(current)) 2803 return -ERESTARTSYS; 2804 schedule(); 2805 return 0; 2806 } 2807 2808 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp) 2809 { 2810 sigset_t oldset; 2811 int res; 2812 2813 might_sleep(); 2814 2815 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_); 2816 2817 rpc_clnt_sigmask(clnt, &oldset); 2818 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER, 2819 nfs4_wait_bit_interruptible, 2820 TASK_INTERRUPTIBLE); 2821 rpc_clnt_sigunmask(clnt, &oldset); 2822 2823 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_); 2824 return res; 2825 } 2826 2827 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 2828 { 2829 sigset_t oldset; 2830 int res = 0; 2831 2832 might_sleep(); 2833 2834 if (*timeout <= 0) 2835 *timeout = NFS4_POLL_RETRY_MIN; 2836 if (*timeout > NFS4_POLL_RETRY_MAX) 2837 *timeout = NFS4_POLL_RETRY_MAX; 2838 rpc_clnt_sigmask(clnt, &oldset); 2839 if (clnt->cl_intr) { 2840 schedule_timeout_interruptible(*timeout); 2841 if (signalled()) 2842 res = -ERESTARTSYS; 2843 } else 2844 schedule_timeout_uninterruptible(*timeout); 2845 rpc_clnt_sigunmask(clnt, &oldset); 2846 *timeout <<= 1; 2847 return res; 2848 } 2849 2850 /* This is the error handling routine for processes that are allowed 2851 * to sleep. 2852 */ 2853 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 2854 { 2855 struct nfs_client *clp = server->nfs_client; 2856 int ret = errorcode; 2857 2858 exception->retry = 0; 2859 switch(errorcode) { 2860 case 0: 2861 return 0; 2862 case -NFS4ERR_STALE_CLIENTID: 2863 case -NFS4ERR_STALE_STATEID: 2864 case -NFS4ERR_EXPIRED: 2865 nfs4_schedule_state_recovery(clp); 2866 ret = nfs4_wait_clnt_recover(server->client, clp); 2867 if (ret == 0) 2868 exception->retry = 1; 2869 break; 2870 case -NFS4ERR_FILE_OPEN: 2871 case -NFS4ERR_GRACE: 2872 case -NFS4ERR_DELAY: 2873 ret = nfs4_delay(server->client, &exception->timeout); 2874 if (ret != 0) 2875 break; 2876 case -NFS4ERR_OLD_STATEID: 2877 exception->retry = 1; 2878 } 2879 /* We failed to handle the error */ 2880 return nfs4_map_errors(ret); 2881 } 2882 2883 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred) 2884 { 2885 nfs4_verifier sc_verifier; 2886 struct nfs4_setclientid setclientid = { 2887 .sc_verifier = &sc_verifier, 2888 .sc_prog = program, 2889 }; 2890 struct rpc_message msg = { 2891 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 2892 .rpc_argp = &setclientid, 2893 .rpc_resp = clp, 2894 .rpc_cred = cred, 2895 }; 2896 __be32 *p; 2897 int loop = 0; 2898 int status; 2899 2900 p = (__be32*)sc_verifier.data; 2901 *p++ = htonl((u32)clp->cl_boot_time.tv_sec); 2902 *p = htonl((u32)clp->cl_boot_time.tv_nsec); 2903 2904 for(;;) { 2905 setclientid.sc_name_len = scnprintf(setclientid.sc_name, 2906 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u", 2907 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr), 2908 cred->cr_ops->cr_name, 2909 clp->cl_id_uniquifier); 2910 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid, 2911 sizeof(setclientid.sc_netid), "tcp"); 2912 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 2913 sizeof(setclientid.sc_uaddr), "%s.%d.%d", 2914 clp->cl_ipaddr, port >> 8, port & 255); 2915 2916 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 2917 if (status != -NFS4ERR_CLID_INUSE) 2918 break; 2919 if (signalled()) 2920 break; 2921 if (loop++ & 1) 2922 ssleep(clp->cl_lease_time + 1); 2923 else 2924 if (++clp->cl_id_uniquifier == 0) 2925 break; 2926 } 2927 return status; 2928 } 2929 2930 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred) 2931 { 2932 struct nfs_fsinfo fsinfo; 2933 struct rpc_message msg = { 2934 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 2935 .rpc_argp = clp, 2936 .rpc_resp = &fsinfo, 2937 .rpc_cred = cred, 2938 }; 2939 unsigned long now; 2940 int status; 2941 2942 now = jiffies; 2943 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 2944 if (status == 0) { 2945 spin_lock(&clp->cl_lock); 2946 clp->cl_lease_time = fsinfo.lease_time * HZ; 2947 clp->cl_last_renewal = now; 2948 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); 2949 spin_unlock(&clp->cl_lock); 2950 } 2951 return status; 2952 } 2953 2954 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred) 2955 { 2956 long timeout; 2957 int err; 2958 do { 2959 err = _nfs4_proc_setclientid_confirm(clp, cred); 2960 switch (err) { 2961 case 0: 2962 return err; 2963 case -NFS4ERR_RESOURCE: 2964 /* The IBM lawyers misread another document! */ 2965 case -NFS4ERR_DELAY: 2966 err = nfs4_delay(clp->cl_rpcclient, &timeout); 2967 } 2968 } while (err == 0); 2969 return err; 2970 } 2971 2972 struct nfs4_delegreturndata { 2973 struct nfs4_delegreturnargs args; 2974 struct nfs4_delegreturnres res; 2975 struct nfs_fh fh; 2976 nfs4_stateid stateid; 2977 struct rpc_cred *cred; 2978 unsigned long timestamp; 2979 struct nfs_fattr fattr; 2980 int rpc_status; 2981 }; 2982 2983 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata) 2984 { 2985 struct nfs4_delegreturndata *data = calldata; 2986 struct rpc_message msg = { 2987 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 2988 .rpc_argp = &data->args, 2989 .rpc_resp = &data->res, 2990 .rpc_cred = data->cred, 2991 }; 2992 nfs_fattr_init(data->res.fattr); 2993 rpc_call_setup(task, &msg, 0); 2994 } 2995 2996 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 2997 { 2998 struct nfs4_delegreturndata *data = calldata; 2999 data->rpc_status = task->tk_status; 3000 if (data->rpc_status == 0) 3001 renew_lease(data->res.server, data->timestamp); 3002 } 3003 3004 static void nfs4_delegreturn_release(void *calldata) 3005 { 3006 struct nfs4_delegreturndata *data = calldata; 3007 3008 put_rpccred(data->cred); 3009 kfree(calldata); 3010 } 3011 3012 static const struct rpc_call_ops nfs4_delegreturn_ops = { 3013 .rpc_call_prepare = nfs4_delegreturn_prepare, 3014 .rpc_call_done = nfs4_delegreturn_done, 3015 .rpc_release = nfs4_delegreturn_release, 3016 }; 3017 3018 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid) 3019 { 3020 struct nfs4_delegreturndata *data; 3021 struct nfs_server *server = NFS_SERVER(inode); 3022 struct rpc_task *task; 3023 int status; 3024 3025 data = kmalloc(sizeof(*data), GFP_KERNEL); 3026 if (data == NULL) 3027 return -ENOMEM; 3028 data->args.fhandle = &data->fh; 3029 data->args.stateid = &data->stateid; 3030 data->args.bitmask = server->attr_bitmask; 3031 nfs_copy_fh(&data->fh, NFS_FH(inode)); 3032 memcpy(&data->stateid, stateid, sizeof(data->stateid)); 3033 data->res.fattr = &data->fattr; 3034 data->res.server = server; 3035 data->cred = get_rpccred(cred); 3036 data->timestamp = jiffies; 3037 data->rpc_status = 0; 3038 3039 task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data); 3040 if (IS_ERR(task)) 3041 return PTR_ERR(task); 3042 status = nfs4_wait_for_completion_rpc_task(task); 3043 if (status == 0) { 3044 status = data->rpc_status; 3045 if (status == 0) 3046 nfs_refresh_inode(inode, &data->fattr); 3047 } 3048 rpc_put_task(task); 3049 return status; 3050 } 3051 3052 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid) 3053 { 3054 struct nfs_server *server = NFS_SERVER(inode); 3055 struct nfs4_exception exception = { }; 3056 int err; 3057 do { 3058 err = _nfs4_proc_delegreturn(inode, cred, stateid); 3059 switch (err) { 3060 case -NFS4ERR_STALE_STATEID: 3061 case -NFS4ERR_EXPIRED: 3062 case 0: 3063 return 0; 3064 } 3065 err = nfs4_handle_exception(server, err, &exception); 3066 } while (exception.retry); 3067 return err; 3068 } 3069 3070 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 3071 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 3072 3073 /* 3074 * sleep, with exponential backoff, and retry the LOCK operation. 3075 */ 3076 static unsigned long 3077 nfs4_set_lock_task_retry(unsigned long timeout) 3078 { 3079 schedule_timeout_interruptible(timeout); 3080 timeout <<= 1; 3081 if (timeout > NFS4_LOCK_MAXTIMEOUT) 3082 return NFS4_LOCK_MAXTIMEOUT; 3083 return timeout; 3084 } 3085 3086 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 3087 { 3088 struct inode *inode = state->inode; 3089 struct nfs_server *server = NFS_SERVER(inode); 3090 struct nfs_client *clp = server->nfs_client; 3091 struct nfs_lockt_args arg = { 3092 .fh = NFS_FH(inode), 3093 .fl = request, 3094 }; 3095 struct nfs_lockt_res res = { 3096 .denied = request, 3097 }; 3098 struct rpc_message msg = { 3099 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 3100 .rpc_argp = &arg, 3101 .rpc_resp = &res, 3102 .rpc_cred = state->owner->so_cred, 3103 }; 3104 struct nfs4_lock_state *lsp; 3105 int status; 3106 3107 down_read(&clp->cl_sem); 3108 arg.lock_owner.clientid = clp->cl_clientid; 3109 status = nfs4_set_lock_state(state, request); 3110 if (status != 0) 3111 goto out; 3112 lsp = request->fl_u.nfs4_fl.owner; 3113 arg.lock_owner.id = lsp->ls_id.id; 3114 status = rpc_call_sync(server->client, &msg, 0); 3115 switch (status) { 3116 case 0: 3117 request->fl_type = F_UNLCK; 3118 break; 3119 case -NFS4ERR_DENIED: 3120 status = 0; 3121 } 3122 request->fl_ops->fl_release_private(request); 3123 out: 3124 up_read(&clp->cl_sem); 3125 return status; 3126 } 3127 3128 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 3129 { 3130 struct nfs4_exception exception = { }; 3131 int err; 3132 3133 do { 3134 err = nfs4_handle_exception(NFS_SERVER(state->inode), 3135 _nfs4_proc_getlk(state, cmd, request), 3136 &exception); 3137 } while (exception.retry); 3138 return err; 3139 } 3140 3141 static int do_vfs_lock(struct file *file, struct file_lock *fl) 3142 { 3143 int res = 0; 3144 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 3145 case FL_POSIX: 3146 res = posix_lock_file_wait(file, fl); 3147 break; 3148 case FL_FLOCK: 3149 res = flock_lock_file_wait(file, fl); 3150 break; 3151 default: 3152 BUG(); 3153 } 3154 return res; 3155 } 3156 3157 struct nfs4_unlockdata { 3158 struct nfs_locku_args arg; 3159 struct nfs_locku_res res; 3160 struct nfs4_lock_state *lsp; 3161 struct nfs_open_context *ctx; 3162 struct file_lock fl; 3163 const struct nfs_server *server; 3164 unsigned long timestamp; 3165 }; 3166 3167 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 3168 struct nfs_open_context *ctx, 3169 struct nfs4_lock_state *lsp, 3170 struct nfs_seqid *seqid) 3171 { 3172 struct nfs4_unlockdata *p; 3173 struct inode *inode = lsp->ls_state->inode; 3174 3175 p = kmalloc(sizeof(*p), GFP_KERNEL); 3176 if (p == NULL) 3177 return NULL; 3178 p->arg.fh = NFS_FH(inode); 3179 p->arg.fl = &p->fl; 3180 p->arg.seqid = seqid; 3181 p->arg.stateid = &lsp->ls_stateid; 3182 p->lsp = lsp; 3183 atomic_inc(&lsp->ls_count); 3184 /* Ensure we don't close file until we're done freeing locks! */ 3185 p->ctx = get_nfs_open_context(ctx); 3186 memcpy(&p->fl, fl, sizeof(p->fl)); 3187 p->server = NFS_SERVER(inode); 3188 return p; 3189 } 3190 3191 static void nfs4_locku_release_calldata(void *data) 3192 { 3193 struct nfs4_unlockdata *calldata = data; 3194 nfs_free_seqid(calldata->arg.seqid); 3195 nfs4_put_lock_state(calldata->lsp); 3196 put_nfs_open_context(calldata->ctx); 3197 kfree(calldata); 3198 } 3199 3200 static void nfs4_locku_done(struct rpc_task *task, void *data) 3201 { 3202 struct nfs4_unlockdata *calldata = data; 3203 3204 if (RPC_ASSASSINATED(task)) 3205 return; 3206 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid); 3207 switch (task->tk_status) { 3208 case 0: 3209 memcpy(calldata->lsp->ls_stateid.data, 3210 calldata->res.stateid.data, 3211 sizeof(calldata->lsp->ls_stateid.data)); 3212 renew_lease(calldata->server, calldata->timestamp); 3213 break; 3214 case -NFS4ERR_STALE_STATEID: 3215 case -NFS4ERR_EXPIRED: 3216 break; 3217 default: 3218 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) 3219 rpc_restart_call(task); 3220 } 3221 } 3222 3223 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 3224 { 3225 struct nfs4_unlockdata *calldata = data; 3226 struct rpc_message msg = { 3227 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 3228 .rpc_argp = &calldata->arg, 3229 .rpc_resp = &calldata->res, 3230 .rpc_cred = calldata->lsp->ls_state->owner->so_cred, 3231 }; 3232 3233 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3234 return; 3235 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) { 3236 /* Note: exit _without_ running nfs4_locku_done */ 3237 task->tk_action = NULL; 3238 return; 3239 } 3240 calldata->timestamp = jiffies; 3241 rpc_call_setup(task, &msg, 0); 3242 } 3243 3244 static const struct rpc_call_ops nfs4_locku_ops = { 3245 .rpc_call_prepare = nfs4_locku_prepare, 3246 .rpc_call_done = nfs4_locku_done, 3247 .rpc_release = nfs4_locku_release_calldata, 3248 }; 3249 3250 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 3251 struct nfs_open_context *ctx, 3252 struct nfs4_lock_state *lsp, 3253 struct nfs_seqid *seqid) 3254 { 3255 struct nfs4_unlockdata *data; 3256 3257 /* Ensure this is an unlock - when canceling a lock, the 3258 * canceled lock is passed in, and it won't be an unlock. 3259 */ 3260 fl->fl_type = F_UNLCK; 3261 3262 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 3263 if (data == NULL) { 3264 nfs_free_seqid(seqid); 3265 return ERR_PTR(-ENOMEM); 3266 } 3267 3268 return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data); 3269 } 3270 3271 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 3272 { 3273 struct nfs_seqid *seqid; 3274 struct nfs4_lock_state *lsp; 3275 struct rpc_task *task; 3276 int status = 0; 3277 3278 status = nfs4_set_lock_state(state, request); 3279 /* Unlock _before_ we do the RPC call */ 3280 request->fl_flags |= FL_EXISTS; 3281 if (do_vfs_lock(request->fl_file, request) == -ENOENT) 3282 goto out; 3283 if (status != 0) 3284 goto out; 3285 /* Is this a delegated lock? */ 3286 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) 3287 goto out; 3288 lsp = request->fl_u.nfs4_fl.owner; 3289 seqid = nfs_alloc_seqid(&lsp->ls_seqid); 3290 status = -ENOMEM; 3291 if (seqid == NULL) 3292 goto out; 3293 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 3294 status = PTR_ERR(task); 3295 if (IS_ERR(task)) 3296 goto out; 3297 status = nfs4_wait_for_completion_rpc_task(task); 3298 rpc_put_task(task); 3299 out: 3300 return status; 3301 } 3302 3303 struct nfs4_lockdata { 3304 struct nfs_lock_args arg; 3305 struct nfs_lock_res res; 3306 struct nfs4_lock_state *lsp; 3307 struct nfs_open_context *ctx; 3308 struct file_lock fl; 3309 unsigned long timestamp; 3310 int rpc_status; 3311 int cancelled; 3312 }; 3313 3314 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 3315 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp) 3316 { 3317 struct nfs4_lockdata *p; 3318 struct inode *inode = lsp->ls_state->inode; 3319 struct nfs_server *server = NFS_SERVER(inode); 3320 3321 p = kzalloc(sizeof(*p), GFP_KERNEL); 3322 if (p == NULL) 3323 return NULL; 3324 3325 p->arg.fh = NFS_FH(inode); 3326 p->arg.fl = &p->fl; 3327 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid); 3328 if (p->arg.lock_seqid == NULL) 3329 goto out_free; 3330 p->arg.lock_stateid = &lsp->ls_stateid; 3331 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 3332 p->arg.lock_owner.id = lsp->ls_id.id; 3333 p->lsp = lsp; 3334 atomic_inc(&lsp->ls_count); 3335 p->ctx = get_nfs_open_context(ctx); 3336 memcpy(&p->fl, fl, sizeof(p->fl)); 3337 return p; 3338 out_free: 3339 kfree(p); 3340 return NULL; 3341 } 3342 3343 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 3344 { 3345 struct nfs4_lockdata *data = calldata; 3346 struct nfs4_state *state = data->lsp->ls_state; 3347 struct nfs4_state_owner *sp = state->owner; 3348 struct rpc_message msg = { 3349 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 3350 .rpc_argp = &data->arg, 3351 .rpc_resp = &data->res, 3352 .rpc_cred = sp->so_cred, 3353 }; 3354 3355 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 3356 return; 3357 dprintk("%s: begin!\n", __FUNCTION__); 3358 /* Do we need to do an open_to_lock_owner? */ 3359 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) { 3360 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid); 3361 if (data->arg.open_seqid == NULL) { 3362 data->rpc_status = -ENOMEM; 3363 task->tk_action = NULL; 3364 goto out; 3365 } 3366 data->arg.open_stateid = &state->stateid; 3367 data->arg.new_lock_owner = 1; 3368 } 3369 data->timestamp = jiffies; 3370 rpc_call_setup(task, &msg, 0); 3371 out: 3372 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status); 3373 } 3374 3375 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 3376 { 3377 struct nfs4_lockdata *data = calldata; 3378 3379 dprintk("%s: begin!\n", __FUNCTION__); 3380 3381 data->rpc_status = task->tk_status; 3382 if (RPC_ASSASSINATED(task)) 3383 goto out; 3384 if (data->arg.new_lock_owner != 0) { 3385 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid); 3386 if (data->rpc_status == 0) 3387 nfs_confirm_seqid(&data->lsp->ls_seqid, 0); 3388 else 3389 goto out; 3390 } 3391 if (data->rpc_status == 0) { 3392 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data, 3393 sizeof(data->lsp->ls_stateid.data)); 3394 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED; 3395 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp); 3396 } 3397 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid); 3398 out: 3399 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status); 3400 } 3401 3402 static void nfs4_lock_release(void *calldata) 3403 { 3404 struct nfs4_lockdata *data = calldata; 3405 3406 dprintk("%s: begin!\n", __FUNCTION__); 3407 if (data->arg.open_seqid != NULL) 3408 nfs_free_seqid(data->arg.open_seqid); 3409 if (data->cancelled != 0) { 3410 struct rpc_task *task; 3411 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 3412 data->arg.lock_seqid); 3413 if (!IS_ERR(task)) 3414 rpc_put_task(task); 3415 dprintk("%s: cancelling lock!\n", __FUNCTION__); 3416 } else 3417 nfs_free_seqid(data->arg.lock_seqid); 3418 nfs4_put_lock_state(data->lsp); 3419 put_nfs_open_context(data->ctx); 3420 kfree(data); 3421 dprintk("%s: done!\n", __FUNCTION__); 3422 } 3423 3424 static const struct rpc_call_ops nfs4_lock_ops = { 3425 .rpc_call_prepare = nfs4_lock_prepare, 3426 .rpc_call_done = nfs4_lock_done, 3427 .rpc_release = nfs4_lock_release, 3428 }; 3429 3430 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim) 3431 { 3432 struct nfs4_lockdata *data; 3433 struct rpc_task *task; 3434 int ret; 3435 3436 dprintk("%s: begin!\n", __FUNCTION__); 3437 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 3438 fl->fl_u.nfs4_fl.owner); 3439 if (data == NULL) 3440 return -ENOMEM; 3441 if (IS_SETLKW(cmd)) 3442 data->arg.block = 1; 3443 if (reclaim != 0) 3444 data->arg.reclaim = 1; 3445 task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC, 3446 &nfs4_lock_ops, data); 3447 if (IS_ERR(task)) 3448 return PTR_ERR(task); 3449 ret = nfs4_wait_for_completion_rpc_task(task); 3450 if (ret == 0) { 3451 ret = data->rpc_status; 3452 if (ret == -NFS4ERR_DENIED) 3453 ret = -EAGAIN; 3454 } else 3455 data->cancelled = 1; 3456 rpc_put_task(task); 3457 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret); 3458 return ret; 3459 } 3460 3461 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 3462 { 3463 struct nfs_server *server = NFS_SERVER(state->inode); 3464 struct nfs4_exception exception = { }; 3465 int err; 3466 3467 do { 3468 /* Cache the lock if possible... */ 3469 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 3470 return 0; 3471 err = _nfs4_do_setlk(state, F_SETLK, request, 1); 3472 if (err != -NFS4ERR_DELAY) 3473 break; 3474 nfs4_handle_exception(server, err, &exception); 3475 } while (exception.retry); 3476 return err; 3477 } 3478 3479 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 3480 { 3481 struct nfs_server *server = NFS_SERVER(state->inode); 3482 struct nfs4_exception exception = { }; 3483 int err; 3484 3485 err = nfs4_set_lock_state(state, request); 3486 if (err != 0) 3487 return err; 3488 do { 3489 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 3490 return 0; 3491 err = _nfs4_do_setlk(state, F_SETLK, request, 0); 3492 if (err != -NFS4ERR_DELAY) 3493 break; 3494 nfs4_handle_exception(server, err, &exception); 3495 } while (exception.retry); 3496 return err; 3497 } 3498 3499 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 3500 { 3501 struct nfs_client *clp = state->owner->so_client; 3502 unsigned char fl_flags = request->fl_flags; 3503 int status; 3504 3505 /* Is this a delegated open? */ 3506 status = nfs4_set_lock_state(state, request); 3507 if (status != 0) 3508 goto out; 3509 request->fl_flags |= FL_ACCESS; 3510 status = do_vfs_lock(request->fl_file, request); 3511 if (status < 0) 3512 goto out; 3513 down_read(&clp->cl_sem); 3514 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 3515 struct nfs_inode *nfsi = NFS_I(state->inode); 3516 /* Yes: cache locks! */ 3517 down_read(&nfsi->rwsem); 3518 /* ...but avoid races with delegation recall... */ 3519 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 3520 request->fl_flags = fl_flags & ~FL_SLEEP; 3521 status = do_vfs_lock(request->fl_file, request); 3522 up_read(&nfsi->rwsem); 3523 goto out_unlock; 3524 } 3525 up_read(&nfsi->rwsem); 3526 } 3527 status = _nfs4_do_setlk(state, cmd, request, 0); 3528 if (status != 0) 3529 goto out_unlock; 3530 /* Note: we always want to sleep here! */ 3531 request->fl_flags = fl_flags | FL_SLEEP; 3532 if (do_vfs_lock(request->fl_file, request) < 0) 3533 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__); 3534 out_unlock: 3535 up_read(&clp->cl_sem); 3536 out: 3537 request->fl_flags = fl_flags; 3538 return status; 3539 } 3540 3541 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 3542 { 3543 struct nfs4_exception exception = { }; 3544 int err; 3545 3546 do { 3547 err = nfs4_handle_exception(NFS_SERVER(state->inode), 3548 _nfs4_proc_setlk(state, cmd, request), 3549 &exception); 3550 } while (exception.retry); 3551 return err; 3552 } 3553 3554 static int 3555 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 3556 { 3557 struct nfs_open_context *ctx; 3558 struct nfs4_state *state; 3559 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 3560 int status; 3561 3562 /* verify open state */ 3563 ctx = nfs_file_open_context(filp); 3564 state = ctx->state; 3565 3566 if (request->fl_start < 0 || request->fl_end < 0) 3567 return -EINVAL; 3568 3569 if (IS_GETLK(cmd)) 3570 return nfs4_proc_getlk(state, F_GETLK, request); 3571 3572 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 3573 return -EINVAL; 3574 3575 if (request->fl_type == F_UNLCK) 3576 return nfs4_proc_unlck(state, cmd, request); 3577 3578 do { 3579 status = nfs4_proc_setlk(state, cmd, request); 3580 if ((status != -EAGAIN) || IS_SETLK(cmd)) 3581 break; 3582 timeout = nfs4_set_lock_task_retry(timeout); 3583 status = -ERESTARTSYS; 3584 if (signalled()) 3585 break; 3586 } while(status < 0); 3587 return status; 3588 } 3589 3590 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl) 3591 { 3592 struct nfs_server *server = NFS_SERVER(state->inode); 3593 struct nfs4_exception exception = { }; 3594 int err; 3595 3596 err = nfs4_set_lock_state(state, fl); 3597 if (err != 0) 3598 goto out; 3599 do { 3600 err = _nfs4_do_setlk(state, F_SETLK, fl, 0); 3601 if (err != -NFS4ERR_DELAY) 3602 break; 3603 err = nfs4_handle_exception(server, err, &exception); 3604 } while (exception.retry); 3605 out: 3606 return err; 3607 } 3608 3609 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 3610 3611 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf, 3612 size_t buflen, int flags) 3613 { 3614 struct inode *inode = dentry->d_inode; 3615 3616 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) 3617 return -EOPNOTSUPP; 3618 3619 if (!S_ISREG(inode->i_mode) && 3620 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX)) 3621 return -EPERM; 3622 3623 return nfs4_proc_set_acl(inode, buf, buflen); 3624 } 3625 3626 /* The getxattr man page suggests returning -ENODATA for unknown attributes, 3627 * and that's what we'll do for e.g. user attributes that haven't been set. 3628 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported 3629 * attributes in kernel-managed attribute namespaces. */ 3630 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf, 3631 size_t buflen) 3632 { 3633 struct inode *inode = dentry->d_inode; 3634 3635 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) 3636 return -EOPNOTSUPP; 3637 3638 return nfs4_proc_get_acl(inode, buf, buflen); 3639 } 3640 3641 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen) 3642 { 3643 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1; 3644 3645 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode))) 3646 return 0; 3647 if (buf && buflen < len) 3648 return -ERANGE; 3649 if (buf) 3650 memcpy(buf, XATTR_NAME_NFSV4_ACL, len); 3651 return len; 3652 } 3653 3654 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name, 3655 struct nfs4_fs_locations *fs_locations, struct page *page) 3656 { 3657 struct nfs_server *server = NFS_SERVER(dir); 3658 u32 bitmask[2] = { 3659 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 3660 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID, 3661 }; 3662 struct nfs4_fs_locations_arg args = { 3663 .dir_fh = NFS_FH(dir), 3664 .name = name, 3665 .page = page, 3666 .bitmask = bitmask, 3667 }; 3668 struct rpc_message msg = { 3669 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 3670 .rpc_argp = &args, 3671 .rpc_resp = fs_locations, 3672 }; 3673 int status; 3674 3675 dprintk("%s: start\n", __FUNCTION__); 3676 nfs_fattr_init(&fs_locations->fattr); 3677 fs_locations->server = server; 3678 fs_locations->nlocations = 0; 3679 status = rpc_call_sync(server->client, &msg, 0); 3680 dprintk("%s: returned status = %d\n", __FUNCTION__, status); 3681 return status; 3682 } 3683 3684 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = { 3685 .recover_open = nfs4_open_reclaim, 3686 .recover_lock = nfs4_lock_reclaim, 3687 }; 3688 3689 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = { 3690 .recover_open = nfs4_open_expired, 3691 .recover_lock = nfs4_lock_expired, 3692 }; 3693 3694 static const struct inode_operations nfs4_file_inode_operations = { 3695 .permission = nfs_permission, 3696 .getattr = nfs_getattr, 3697 .setattr = nfs_setattr, 3698 .getxattr = nfs4_getxattr, 3699 .setxattr = nfs4_setxattr, 3700 .listxattr = nfs4_listxattr, 3701 }; 3702 3703 const struct nfs_rpc_ops nfs_v4_clientops = { 3704 .version = 4, /* protocol version */ 3705 .dentry_ops = &nfs4_dentry_operations, 3706 .dir_inode_ops = &nfs4_dir_inode_operations, 3707 .file_inode_ops = &nfs4_file_inode_operations, 3708 .getroot = nfs4_proc_get_root, 3709 .getattr = nfs4_proc_getattr, 3710 .setattr = nfs4_proc_setattr, 3711 .lookupfh = nfs4_proc_lookupfh, 3712 .lookup = nfs4_proc_lookup, 3713 .access = nfs4_proc_access, 3714 .readlink = nfs4_proc_readlink, 3715 .create = nfs4_proc_create, 3716 .remove = nfs4_proc_remove, 3717 .unlink_setup = nfs4_proc_unlink_setup, 3718 .unlink_done = nfs4_proc_unlink_done, 3719 .rename = nfs4_proc_rename, 3720 .link = nfs4_proc_link, 3721 .symlink = nfs4_proc_symlink, 3722 .mkdir = nfs4_proc_mkdir, 3723 .rmdir = nfs4_proc_remove, 3724 .readdir = nfs4_proc_readdir, 3725 .mknod = nfs4_proc_mknod, 3726 .statfs = nfs4_proc_statfs, 3727 .fsinfo = nfs4_proc_fsinfo, 3728 .pathconf = nfs4_proc_pathconf, 3729 .set_capabilities = nfs4_server_capabilities, 3730 .decode_dirent = nfs4_decode_dirent, 3731 .read_setup = nfs4_proc_read_setup, 3732 .read_done = nfs4_read_done, 3733 .write_setup = nfs4_proc_write_setup, 3734 .write_done = nfs4_write_done, 3735 .commit_setup = nfs4_proc_commit_setup, 3736 .commit_done = nfs4_commit_done, 3737 .file_open = nfs_open, 3738 .file_release = nfs_release, 3739 .lock = nfs4_proc_lock, 3740 .clear_acl_cache = nfs4_zap_acl_attr, 3741 }; 3742 3743 /* 3744 * Local variables: 3745 * c-basic-offset: 8 3746 * End: 3747 */ 3748