1 /* 2 * fs/nfs/nfs4proc.c 3 * 4 * Client-side procedure declarations for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/mm.h> 39 #include <linux/utsname.h> 40 #include <linux/delay.h> 41 #include <linux/errno.h> 42 #include <linux/string.h> 43 #include <linux/sunrpc/clnt.h> 44 #include <linux/nfs.h> 45 #include <linux/nfs4.h> 46 #include <linux/nfs_fs.h> 47 #include <linux/nfs_page.h> 48 #include <linux/smp_lock.h> 49 #include <linux/namei.h> 50 #include <linux/mount.h> 51 52 #include "nfs4_fs.h" 53 #include "delegation.h" 54 55 #define NFSDBG_FACILITY NFSDBG_PROC 56 57 #define NFS4_POLL_RETRY_MIN (1*HZ) 58 #define NFS4_POLL_RETRY_MAX (15*HZ) 59 60 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid); 61 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 62 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *); 63 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry); 64 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception); 65 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus); 66 extern struct rpc_procinfo nfs4_procedures[]; 67 68 /* Prevent leaks of NFSv4 errors into userland */ 69 int nfs4_map_errors(int err) 70 { 71 if (err < -1000) { 72 dprintk("%s could not handle NFSv4 error %d\n", 73 __FUNCTION__, -err); 74 return -EIO; 75 } 76 return err; 77 } 78 79 /* 80 * This is our standard bitmap for GETATTR requests. 81 */ 82 const u32 nfs4_fattr_bitmap[2] = { 83 FATTR4_WORD0_TYPE 84 | FATTR4_WORD0_CHANGE 85 | FATTR4_WORD0_SIZE 86 | FATTR4_WORD0_FSID 87 | FATTR4_WORD0_FILEID, 88 FATTR4_WORD1_MODE 89 | FATTR4_WORD1_NUMLINKS 90 | FATTR4_WORD1_OWNER 91 | FATTR4_WORD1_OWNER_GROUP 92 | FATTR4_WORD1_RAWDEV 93 | FATTR4_WORD1_SPACE_USED 94 | FATTR4_WORD1_TIME_ACCESS 95 | FATTR4_WORD1_TIME_METADATA 96 | FATTR4_WORD1_TIME_MODIFY 97 }; 98 99 const u32 nfs4_statfs_bitmap[2] = { 100 FATTR4_WORD0_FILES_AVAIL 101 | FATTR4_WORD0_FILES_FREE 102 | FATTR4_WORD0_FILES_TOTAL, 103 FATTR4_WORD1_SPACE_AVAIL 104 | FATTR4_WORD1_SPACE_FREE 105 | FATTR4_WORD1_SPACE_TOTAL 106 }; 107 108 const u32 nfs4_pathconf_bitmap[2] = { 109 FATTR4_WORD0_MAXLINK 110 | FATTR4_WORD0_MAXNAME, 111 0 112 }; 113 114 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE 115 | FATTR4_WORD0_MAXREAD 116 | FATTR4_WORD0_MAXWRITE 117 | FATTR4_WORD0_LEASE_TIME, 118 0 119 }; 120 121 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry, 122 struct nfs4_readdir_arg *readdir) 123 { 124 u32 *start, *p; 125 126 BUG_ON(readdir->count < 80); 127 if (cookie > 2) { 128 readdir->cookie = cookie; 129 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 130 return; 131 } 132 133 readdir->cookie = 0; 134 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 135 if (cookie == 2) 136 return; 137 138 /* 139 * NFSv4 servers do not return entries for '.' and '..' 140 * Therefore, we fake these entries here. We let '.' 141 * have cookie 0 and '..' have cookie 1. Note that 142 * when talking to the server, we always send cookie 0 143 * instead of 1 or 2. 144 */ 145 start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0); 146 147 if (cookie == 0) { 148 *p++ = xdr_one; /* next */ 149 *p++ = xdr_zero; /* cookie, first word */ 150 *p++ = xdr_one; /* cookie, second word */ 151 *p++ = xdr_one; /* entry len */ 152 memcpy(p, ".\0\0\0", 4); /* entry */ 153 p++; 154 *p++ = xdr_one; /* bitmap length */ 155 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 156 *p++ = htonl(8); /* attribute buffer length */ 157 p = xdr_encode_hyper(p, dentry->d_inode->i_ino); 158 } 159 160 *p++ = xdr_one; /* next */ 161 *p++ = xdr_zero; /* cookie, first word */ 162 *p++ = xdr_two; /* cookie, second word */ 163 *p++ = xdr_two; /* entry len */ 164 memcpy(p, "..\0\0", 4); /* entry */ 165 p++; 166 *p++ = xdr_one; /* bitmap length */ 167 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 168 *p++ = htonl(8); /* attribute buffer length */ 169 p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino); 170 171 readdir->pgbase = (char *)p - (char *)start; 172 readdir->count -= readdir->pgbase; 173 kunmap_atomic(start, KM_USER0); 174 } 175 176 static void 177 renew_lease(struct nfs_server *server, unsigned long timestamp) 178 { 179 struct nfs4_client *clp = server->nfs4_state; 180 spin_lock(&clp->cl_lock); 181 if (time_before(clp->cl_last_renewal,timestamp)) 182 clp->cl_last_renewal = timestamp; 183 spin_unlock(&clp->cl_lock); 184 } 185 186 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo) 187 { 188 struct nfs_inode *nfsi = NFS_I(inode); 189 190 spin_lock(&inode->i_lock); 191 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 192 if (cinfo->before == nfsi->change_attr && cinfo->atomic) 193 nfsi->change_attr = cinfo->after; 194 spin_unlock(&inode->i_lock); 195 } 196 197 /* Helper for asynchronous RPC calls */ 198 static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin, 199 rpc_action tk_exit, void *calldata) 200 { 201 struct rpc_task *task; 202 203 if (!(task = rpc_new_task(clnt, tk_exit, RPC_TASK_ASYNC))) 204 return -ENOMEM; 205 206 task->tk_calldata = calldata; 207 task->tk_action = tk_begin; 208 rpc_execute(task); 209 return 0; 210 } 211 212 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags) 213 { 214 struct inode *inode = state->inode; 215 216 open_flags &= (FMODE_READ|FMODE_WRITE); 217 /* Protect against nfs4_find_state_byowner() */ 218 spin_lock(&state->owner->so_lock); 219 spin_lock(&inode->i_lock); 220 memcpy(&state->stateid, stateid, sizeof(state->stateid)); 221 if ((open_flags & FMODE_WRITE)) 222 state->nwriters++; 223 if (open_flags & FMODE_READ) 224 state->nreaders++; 225 nfs4_state_set_mode_locked(state, state->state | open_flags); 226 spin_unlock(&inode->i_lock); 227 spin_unlock(&state->owner->so_lock); 228 } 229 230 /* 231 * OPEN_RECLAIM: 232 * reclaim state on the server after a reboot. 233 */ 234 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 235 { 236 struct inode *inode = state->inode; 237 struct nfs_server *server = NFS_SERVER(inode); 238 struct nfs_delegation *delegation = NFS_I(inode)->delegation; 239 struct nfs_openargs o_arg = { 240 .fh = NFS_FH(inode), 241 .id = sp->so_id, 242 .open_flags = state->state, 243 .clientid = server->nfs4_state->cl_clientid, 244 .claim = NFS4_OPEN_CLAIM_PREVIOUS, 245 .bitmask = server->attr_bitmask, 246 }; 247 struct nfs_openres o_res = { 248 .server = server, /* Grrr */ 249 }; 250 struct rpc_message msg = { 251 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR], 252 .rpc_argp = &o_arg, 253 .rpc_resp = &o_res, 254 .rpc_cred = sp->so_cred, 255 }; 256 int status; 257 258 if (delegation != NULL) { 259 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) { 260 memcpy(&state->stateid, &delegation->stateid, 261 sizeof(state->stateid)); 262 set_bit(NFS_DELEGATED_STATE, &state->flags); 263 return 0; 264 } 265 o_arg.u.delegation_type = delegation->type; 266 } 267 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid); 268 if (o_arg.seqid == NULL) 269 return -ENOMEM; 270 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); 271 /* Confirm the sequence as being established */ 272 nfs_confirm_seqid(&sp->so_seqid, status); 273 nfs_increment_open_seqid(status, o_arg.seqid); 274 if (status == 0) { 275 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid)); 276 if (o_res.delegation_type != 0) { 277 nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res); 278 /* Did the server issue an immediate delegation recall? */ 279 if (o_res.do_recall) 280 nfs_async_inode_return_delegation(inode, &o_res.stateid); 281 } 282 } 283 nfs_free_seqid(o_arg.seqid); 284 clear_bit(NFS_DELEGATED_STATE, &state->flags); 285 /* Ensure we update the inode attributes */ 286 NFS_CACHEINV(inode); 287 return status; 288 } 289 290 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 291 { 292 struct nfs_server *server = NFS_SERVER(state->inode); 293 struct nfs4_exception exception = { }; 294 int err; 295 do { 296 err = _nfs4_open_reclaim(sp, state); 297 if (err != -NFS4ERR_DELAY) 298 break; 299 nfs4_handle_exception(server, err, &exception); 300 } while (exception.retry); 301 return err; 302 } 303 304 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state) 305 { 306 struct nfs4_state_owner *sp = state->owner; 307 struct inode *inode = dentry->d_inode; 308 struct nfs_server *server = NFS_SERVER(inode); 309 struct dentry *parent = dget_parent(dentry); 310 struct nfs_openargs arg = { 311 .fh = NFS_FH(parent->d_inode), 312 .clientid = server->nfs4_state->cl_clientid, 313 .name = &dentry->d_name, 314 .id = sp->so_id, 315 .server = server, 316 .bitmask = server->attr_bitmask, 317 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR, 318 }; 319 struct nfs_openres res = { 320 .server = server, 321 }; 322 struct rpc_message msg = { 323 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR], 324 .rpc_argp = &arg, 325 .rpc_resp = &res, 326 .rpc_cred = sp->so_cred, 327 }; 328 int status = 0; 329 330 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) 331 goto out; 332 if (state->state == 0) 333 goto out; 334 arg.seqid = nfs_alloc_seqid(&sp->so_seqid); 335 status = -ENOMEM; 336 if (arg.seqid == NULL) 337 goto out; 338 arg.open_flags = state->state; 339 memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data)); 340 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); 341 nfs_increment_open_seqid(status, arg.seqid); 342 if (status != 0) 343 goto out_free; 344 if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) { 345 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode), 346 sp, &res.stateid, arg.seqid); 347 if (status != 0) 348 goto out_free; 349 } 350 nfs_confirm_seqid(&sp->so_seqid, 0); 351 if (status >= 0) { 352 memcpy(state->stateid.data, res.stateid.data, 353 sizeof(state->stateid.data)); 354 clear_bit(NFS_DELEGATED_STATE, &state->flags); 355 } 356 out_free: 357 nfs_free_seqid(arg.seqid); 358 out: 359 dput(parent); 360 return status; 361 } 362 363 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state) 364 { 365 struct nfs4_exception exception = { }; 366 struct nfs_server *server = NFS_SERVER(dentry->d_inode); 367 int err; 368 do { 369 err = _nfs4_open_delegation_recall(dentry, state); 370 switch (err) { 371 case 0: 372 return err; 373 case -NFS4ERR_STALE_CLIENTID: 374 case -NFS4ERR_STALE_STATEID: 375 case -NFS4ERR_EXPIRED: 376 /* Don't recall a delegation if it was lost */ 377 nfs4_schedule_state_recovery(server->nfs4_state); 378 return err; 379 } 380 err = nfs4_handle_exception(server, err, &exception); 381 } while (exception.retry); 382 return err; 383 } 384 385 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid) 386 { 387 struct nfs_open_confirmargs arg = { 388 .fh = fh, 389 .seqid = seqid, 390 .stateid = *stateid, 391 }; 392 struct nfs_open_confirmres res; 393 struct rpc_message msg = { 394 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 395 .rpc_argp = &arg, 396 .rpc_resp = &res, 397 .rpc_cred = sp->so_cred, 398 }; 399 int status; 400 401 status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR); 402 /* Confirm the sequence as being established */ 403 nfs_confirm_seqid(&sp->so_seqid, status); 404 nfs_increment_open_seqid(status, seqid); 405 if (status >= 0) 406 memcpy(stateid, &res.stateid, sizeof(*stateid)); 407 return status; 408 } 409 410 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res) 411 { 412 struct nfs_server *server = NFS_SERVER(dir); 413 struct rpc_message msg = { 414 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 415 .rpc_argp = o_arg, 416 .rpc_resp = o_res, 417 .rpc_cred = sp->so_cred, 418 }; 419 int status; 420 421 /* Update sequence id. The caller must serialize! */ 422 o_arg->id = sp->so_id; 423 o_arg->clientid = sp->so_client->cl_clientid; 424 425 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); 426 if (status == 0) { 427 /* OPEN on anything except a regular file is disallowed in NFSv4 */ 428 switch (o_res->f_attr->mode & S_IFMT) { 429 case S_IFREG: 430 break; 431 case S_IFLNK: 432 status = -ELOOP; 433 break; 434 case S_IFDIR: 435 status = -EISDIR; 436 break; 437 default: 438 status = -ENOTDIR; 439 } 440 } 441 442 nfs_increment_open_seqid(status, o_arg->seqid); 443 if (status != 0) 444 goto out; 445 if (o_arg->open_flags & O_CREAT) { 446 update_changeattr(dir, &o_res->cinfo); 447 nfs_post_op_update_inode(dir, o_res->dir_attr); 448 } else 449 nfs_refresh_inode(dir, o_res->dir_attr); 450 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 451 status = _nfs4_proc_open_confirm(server->client, &o_res->fh, 452 sp, &o_res->stateid, o_arg->seqid); 453 if (status != 0) 454 goto out; 455 } 456 nfs_confirm_seqid(&sp->so_seqid, 0); 457 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) 458 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr); 459 out: 460 return status; 461 } 462 463 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags) 464 { 465 struct nfs_access_entry cache; 466 int mask = 0; 467 int status; 468 469 if (openflags & FMODE_READ) 470 mask |= MAY_READ; 471 if (openflags & FMODE_WRITE) 472 mask |= MAY_WRITE; 473 status = nfs_access_get_cached(inode, cred, &cache); 474 if (status == 0) 475 goto out; 476 477 /* Be clever: ask server to check for all possible rights */ 478 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; 479 cache.cred = cred; 480 cache.jiffies = jiffies; 481 status = _nfs4_proc_access(inode, &cache); 482 if (status != 0) 483 return status; 484 nfs_access_add_cache(inode, &cache); 485 out: 486 if ((cache.mask & mask) == mask) 487 return 0; 488 return -EACCES; 489 } 490 491 /* 492 * OPEN_EXPIRED: 493 * reclaim state on the server after a network partition. 494 * Assumes caller holds the appropriate lock 495 */ 496 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) 497 { 498 struct dentry *parent = dget_parent(dentry); 499 struct inode *dir = parent->d_inode; 500 struct inode *inode = state->inode; 501 struct nfs_server *server = NFS_SERVER(dir); 502 struct nfs_delegation *delegation = NFS_I(inode)->delegation; 503 struct nfs_fattr f_attr, dir_attr; 504 struct nfs_openargs o_arg = { 505 .fh = NFS_FH(dir), 506 .open_flags = state->state, 507 .name = &dentry->d_name, 508 .bitmask = server->attr_bitmask, 509 .claim = NFS4_OPEN_CLAIM_NULL, 510 }; 511 struct nfs_openres o_res = { 512 .f_attr = &f_attr, 513 .dir_attr = &dir_attr, 514 .server = server, 515 }; 516 int status = 0; 517 518 if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) { 519 status = _nfs4_do_access(inode, sp->so_cred, state->state); 520 if (status < 0) 521 goto out; 522 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid)); 523 set_bit(NFS_DELEGATED_STATE, &state->flags); 524 goto out; 525 } 526 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid); 527 status = -ENOMEM; 528 if (o_arg.seqid == NULL) 529 goto out; 530 nfs_fattr_init(&f_attr); 531 nfs_fattr_init(&dir_attr); 532 status = _nfs4_proc_open(dir, sp, &o_arg, &o_res); 533 if (status != 0) 534 goto out_nodeleg; 535 /* Check if files differ */ 536 if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT)) 537 goto out_stale; 538 /* Has the file handle changed? */ 539 if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) { 540 /* Verify if the change attributes are the same */ 541 if (f_attr.change_attr != NFS_I(inode)->change_attr) 542 goto out_stale; 543 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size) 544 goto out_stale; 545 /* Lets just pretend that this is the same file */ 546 nfs_copy_fh(NFS_FH(inode), &o_res.fh); 547 NFS_I(inode)->fileid = f_attr.fileid; 548 } 549 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid)); 550 if (o_res.delegation_type != 0) { 551 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) 552 nfs_inode_set_delegation(inode, sp->so_cred, &o_res); 553 else 554 nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res); 555 } 556 out_nodeleg: 557 nfs_free_seqid(o_arg.seqid); 558 clear_bit(NFS_DELEGATED_STATE, &state->flags); 559 out: 560 dput(parent); 561 return status; 562 out_stale: 563 status = -ESTALE; 564 /* Invalidate the state owner so we don't ever use it again */ 565 nfs4_drop_state_owner(sp); 566 d_drop(dentry); 567 /* Should we be trying to close that stateid? */ 568 goto out_nodeleg; 569 } 570 571 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) 572 { 573 struct nfs_server *server = NFS_SERVER(dentry->d_inode); 574 struct nfs4_exception exception = { }; 575 int err; 576 577 do { 578 err = _nfs4_open_expired(sp, state, dentry); 579 if (err == -NFS4ERR_DELAY) 580 nfs4_handle_exception(server, err, &exception); 581 } while (exception.retry); 582 return err; 583 } 584 585 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 586 { 587 struct nfs_inode *nfsi = NFS_I(state->inode); 588 struct nfs_open_context *ctx; 589 int status; 590 591 spin_lock(&state->inode->i_lock); 592 list_for_each_entry(ctx, &nfsi->open_files, list) { 593 if (ctx->state != state) 594 continue; 595 get_nfs_open_context(ctx); 596 spin_unlock(&state->inode->i_lock); 597 status = nfs4_do_open_expired(sp, state, ctx->dentry); 598 put_nfs_open_context(ctx); 599 return status; 600 } 601 spin_unlock(&state->inode->i_lock); 602 return -ENOENT; 603 } 604 605 /* 606 * Returns an nfs4_state + an extra reference to the inode 607 */ 608 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res) 609 { 610 struct nfs_delegation *delegation; 611 struct nfs_server *server = NFS_SERVER(inode); 612 struct nfs4_client *clp = server->nfs4_state; 613 struct nfs_inode *nfsi = NFS_I(inode); 614 struct nfs4_state_owner *sp = NULL; 615 struct nfs4_state *state = NULL; 616 int open_flags = flags & (FMODE_READ|FMODE_WRITE); 617 int err; 618 619 /* Protect against reboot recovery - NOTE ORDER! */ 620 down_read(&clp->cl_sem); 621 /* Protect against delegation recall */ 622 down_read(&nfsi->rwsem); 623 delegation = NFS_I(inode)->delegation; 624 err = -ENOENT; 625 if (delegation == NULL || (delegation->type & open_flags) != open_flags) 626 goto out_err; 627 err = -ENOMEM; 628 if (!(sp = nfs4_get_state_owner(server, cred))) { 629 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__); 630 goto out_err; 631 } 632 state = nfs4_get_open_state(inode, sp); 633 if (state == NULL) 634 goto out_err; 635 636 err = -ENOENT; 637 if ((state->state & open_flags) == open_flags) { 638 spin_lock(&inode->i_lock); 639 if (open_flags & FMODE_READ) 640 state->nreaders++; 641 if (open_flags & FMODE_WRITE) 642 state->nwriters++; 643 spin_unlock(&inode->i_lock); 644 goto out_ok; 645 } else if (state->state != 0) 646 goto out_err; 647 648 lock_kernel(); 649 err = _nfs4_do_access(inode, cred, open_flags); 650 unlock_kernel(); 651 if (err != 0) 652 goto out_err; 653 set_bit(NFS_DELEGATED_STATE, &state->flags); 654 update_open_stateid(state, &delegation->stateid, open_flags); 655 out_ok: 656 nfs4_put_state_owner(sp); 657 up_read(&nfsi->rwsem); 658 up_read(&clp->cl_sem); 659 igrab(inode); 660 *res = state; 661 return 0; 662 out_err: 663 if (sp != NULL) { 664 if (state != NULL) 665 nfs4_put_open_state(state); 666 nfs4_put_state_owner(sp); 667 } 668 up_read(&nfsi->rwsem); 669 up_read(&clp->cl_sem); 670 if (err != -EACCES) 671 nfs_inode_return_delegation(inode); 672 return err; 673 } 674 675 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred) 676 { 677 struct nfs4_exception exception = { }; 678 struct nfs4_state *res; 679 int err; 680 681 do { 682 err = _nfs4_open_delegated(inode, flags, cred, &res); 683 if (err == 0) 684 break; 685 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode), 686 err, &exception)); 687 } while (exception.retry); 688 return res; 689 } 690 691 /* 692 * Returns an nfs4_state + an referenced inode 693 */ 694 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res) 695 { 696 struct nfs4_state_owner *sp; 697 struct nfs4_state *state = NULL; 698 struct nfs_server *server = NFS_SERVER(dir); 699 struct nfs4_client *clp = server->nfs4_state; 700 struct inode *inode = NULL; 701 int status; 702 struct nfs_fattr f_attr, dir_attr; 703 struct nfs_openargs o_arg = { 704 .fh = NFS_FH(dir), 705 .open_flags = flags, 706 .name = &dentry->d_name, 707 .server = server, 708 .bitmask = server->attr_bitmask, 709 .claim = NFS4_OPEN_CLAIM_NULL, 710 }; 711 struct nfs_openres o_res = { 712 .f_attr = &f_attr, 713 .dir_attr = &dir_attr, 714 .server = server, 715 }; 716 717 /* Protect against reboot recovery conflicts */ 718 down_read(&clp->cl_sem); 719 status = -ENOMEM; 720 if (!(sp = nfs4_get_state_owner(server, cred))) { 721 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 722 goto out_err; 723 } 724 if (flags & O_EXCL) { 725 u32 *p = (u32 *) o_arg.u.verifier.data; 726 p[0] = jiffies; 727 p[1] = current->pid; 728 } else 729 o_arg.u.attrs = sattr; 730 /* Serialization for the sequence id */ 731 732 o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid); 733 if (o_arg.seqid == NULL) 734 return -ENOMEM; 735 nfs_fattr_init(&f_attr); 736 nfs_fattr_init(&dir_attr); 737 status = _nfs4_proc_open(dir, sp, &o_arg, &o_res); 738 if (status != 0) 739 goto out_err; 740 741 status = -ENOMEM; 742 inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr); 743 if (!inode) 744 goto out_err; 745 state = nfs4_get_open_state(inode, sp); 746 if (!state) 747 goto out_err; 748 update_open_stateid(state, &o_res.stateid, flags); 749 if (o_res.delegation_type != 0) 750 nfs_inode_set_delegation(inode, cred, &o_res); 751 nfs_free_seqid(o_arg.seqid); 752 nfs4_put_state_owner(sp); 753 up_read(&clp->cl_sem); 754 *res = state; 755 return 0; 756 out_err: 757 if (sp != NULL) { 758 if (state != NULL) 759 nfs4_put_open_state(state); 760 nfs_free_seqid(o_arg.seqid); 761 nfs4_put_state_owner(sp); 762 } 763 /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */ 764 up_read(&clp->cl_sem); 765 if (inode != NULL) 766 iput(inode); 767 *res = NULL; 768 return status; 769 } 770 771 772 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred) 773 { 774 struct nfs4_exception exception = { }; 775 struct nfs4_state *res; 776 int status; 777 778 do { 779 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res); 780 if (status == 0) 781 break; 782 /* NOTE: BAD_SEQID means the server and client disagree about the 783 * book-keeping w.r.t. state-changing operations 784 * (OPEN/CLOSE/LOCK/LOCKU...) 785 * It is actually a sign of a bug on the client or on the server. 786 * 787 * If we receive a BAD_SEQID error in the particular case of 788 * doing an OPEN, we assume that nfs_increment_open_seqid() will 789 * have unhashed the old state_owner for us, and that we can 790 * therefore safely retry using a new one. We should still warn 791 * the user though... 792 */ 793 if (status == -NFS4ERR_BAD_SEQID) { 794 printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n"); 795 exception.retry = 1; 796 continue; 797 } 798 /* 799 * BAD_STATEID on OPEN means that the server cancelled our 800 * state before it received the OPEN_CONFIRM. 801 * Recover by retrying the request as per the discussion 802 * on Page 181 of RFC3530. 803 */ 804 if (status == -NFS4ERR_BAD_STATEID) { 805 exception.retry = 1; 806 continue; 807 } 808 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir), 809 status, &exception)); 810 } while (exception.retry); 811 return res; 812 } 813 814 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr, 815 struct nfs_fh *fhandle, struct iattr *sattr, 816 struct nfs4_state *state) 817 { 818 struct nfs_setattrargs arg = { 819 .fh = fhandle, 820 .iap = sattr, 821 .server = server, 822 .bitmask = server->attr_bitmask, 823 }; 824 struct nfs_setattrres res = { 825 .fattr = fattr, 826 .server = server, 827 }; 828 struct rpc_message msg = { 829 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 830 .rpc_argp = &arg, 831 .rpc_resp = &res, 832 }; 833 int status; 834 835 nfs_fattr_init(fattr); 836 837 if (state != NULL) { 838 msg.rpc_cred = state->owner->so_cred; 839 nfs4_copy_stateid(&arg.stateid, state, current->files); 840 } else 841 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid)); 842 843 status = rpc_call_sync(server->client, &msg, 0); 844 return status; 845 } 846 847 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr, 848 struct nfs_fh *fhandle, struct iattr *sattr, 849 struct nfs4_state *state) 850 { 851 struct nfs4_exception exception = { }; 852 int err; 853 do { 854 err = nfs4_handle_exception(server, 855 _nfs4_do_setattr(server, fattr, fhandle, sattr, 856 state), 857 &exception); 858 } while (exception.retry); 859 return err; 860 } 861 862 struct nfs4_closedata { 863 struct inode *inode; 864 struct nfs4_state *state; 865 struct nfs_closeargs arg; 866 struct nfs_closeres res; 867 struct nfs_fattr fattr; 868 }; 869 870 static void nfs4_free_closedata(struct nfs4_closedata *calldata) 871 { 872 struct nfs4_state *state = calldata->state; 873 struct nfs4_state_owner *sp = state->owner; 874 875 nfs4_put_open_state(calldata->state); 876 nfs_free_seqid(calldata->arg.seqid); 877 nfs4_put_state_owner(sp); 878 kfree(calldata); 879 } 880 881 static void nfs4_close_done(struct rpc_task *task) 882 { 883 struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata; 884 struct nfs4_state *state = calldata->state; 885 struct nfs_server *server = NFS_SERVER(calldata->inode); 886 887 /* hmm. we are done with the inode, and in the process of freeing 888 * the state_owner. we keep this around to process errors 889 */ 890 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid); 891 switch (task->tk_status) { 892 case 0: 893 memcpy(&state->stateid, &calldata->res.stateid, 894 sizeof(state->stateid)); 895 break; 896 case -NFS4ERR_STALE_STATEID: 897 case -NFS4ERR_EXPIRED: 898 nfs4_schedule_state_recovery(server->nfs4_state); 899 break; 900 default: 901 if (nfs4_async_handle_error(task, server) == -EAGAIN) { 902 rpc_restart_call(task); 903 return; 904 } 905 } 906 nfs_refresh_inode(calldata->inode, calldata->res.fattr); 907 nfs4_free_closedata(calldata); 908 } 909 910 static void nfs4_close_begin(struct rpc_task *task) 911 { 912 struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata; 913 struct nfs4_state *state = calldata->state; 914 struct rpc_message msg = { 915 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 916 .rpc_argp = &calldata->arg, 917 .rpc_resp = &calldata->res, 918 .rpc_cred = state->owner->so_cred, 919 }; 920 int mode = 0, old_mode; 921 int status; 922 923 status = nfs_wait_on_sequence(calldata->arg.seqid, task); 924 if (status != 0) 925 return; 926 /* Recalculate the new open mode in case someone reopened the file 927 * while we were waiting in line to be scheduled. 928 */ 929 spin_lock(&state->owner->so_lock); 930 spin_lock(&calldata->inode->i_lock); 931 mode = old_mode = state->state; 932 if (state->nreaders == 0) 933 mode &= ~FMODE_READ; 934 if (state->nwriters == 0) 935 mode &= ~FMODE_WRITE; 936 nfs4_state_set_mode_locked(state, mode); 937 spin_unlock(&calldata->inode->i_lock); 938 spin_unlock(&state->owner->so_lock); 939 if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) { 940 nfs4_free_closedata(calldata); 941 task->tk_exit = NULL; 942 rpc_exit(task, 0); 943 return; 944 } 945 nfs_fattr_init(calldata->res.fattr); 946 if (mode != 0) 947 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 948 calldata->arg.open_flags = mode; 949 rpc_call_setup(task, &msg, 0); 950 } 951 952 /* 953 * It is possible for data to be read/written from a mem-mapped file 954 * after the sys_close call (which hits the vfs layer as a flush). 955 * This means that we can't safely call nfsv4 close on a file until 956 * the inode is cleared. This in turn means that we are not good 957 * NFSv4 citizens - we do not indicate to the server to update the file's 958 * share state even when we are done with one of the three share 959 * stateid's in the inode. 960 * 961 * NOTE: Caller must be holding the sp->so_owner semaphore! 962 */ 963 int nfs4_do_close(struct inode *inode, struct nfs4_state *state) 964 { 965 struct nfs_server *server = NFS_SERVER(inode); 966 struct nfs4_closedata *calldata; 967 int status = -ENOMEM; 968 969 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL); 970 if (calldata == NULL) 971 goto out; 972 calldata->inode = inode; 973 calldata->state = state; 974 calldata->arg.fh = NFS_FH(inode); 975 calldata->arg.stateid = &state->stateid; 976 /* Serialization for the sequence id */ 977 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid); 978 if (calldata->arg.seqid == NULL) 979 goto out_free_calldata; 980 calldata->arg.bitmask = server->attr_bitmask; 981 calldata->res.fattr = &calldata->fattr; 982 calldata->res.server = server; 983 984 status = nfs4_call_async(server->client, nfs4_close_begin, 985 nfs4_close_done, calldata); 986 if (status == 0) 987 goto out; 988 989 nfs_free_seqid(calldata->arg.seqid); 990 out_free_calldata: 991 kfree(calldata); 992 out: 993 return status; 994 } 995 996 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state) 997 { 998 struct file *filp; 999 1000 filp = lookup_instantiate_filp(nd, dentry, NULL); 1001 if (!IS_ERR(filp)) { 1002 struct nfs_open_context *ctx; 1003 ctx = (struct nfs_open_context *)filp->private_data; 1004 ctx->state = state; 1005 } else 1006 nfs4_close_state(state, nd->intent.open.flags); 1007 } 1008 1009 struct dentry * 1010 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 1011 { 1012 struct iattr attr; 1013 struct rpc_cred *cred; 1014 struct nfs4_state *state; 1015 struct dentry *res; 1016 1017 if (nd->flags & LOOKUP_CREATE) { 1018 attr.ia_mode = nd->intent.open.create_mode; 1019 attr.ia_valid = ATTR_MODE; 1020 if (!IS_POSIXACL(dir)) 1021 attr.ia_mode &= ~current->fs->umask; 1022 } else { 1023 attr.ia_valid = 0; 1024 BUG_ON(nd->intent.open.flags & O_CREAT); 1025 } 1026 1027 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0); 1028 if (IS_ERR(cred)) 1029 return (struct dentry *)cred; 1030 state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred); 1031 put_rpccred(cred); 1032 if (IS_ERR(state)) { 1033 if (PTR_ERR(state) == -ENOENT) 1034 d_add(dentry, NULL); 1035 return (struct dentry *)state; 1036 } 1037 res = d_add_unique(dentry, state->inode); 1038 if (res != NULL) 1039 dentry = res; 1040 nfs4_intent_set_file(nd, dentry, state); 1041 return res; 1042 } 1043 1044 int 1045 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd) 1046 { 1047 struct rpc_cred *cred; 1048 struct nfs4_state *state; 1049 struct inode *inode; 1050 1051 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0); 1052 if (IS_ERR(cred)) 1053 return PTR_ERR(cred); 1054 state = nfs4_open_delegated(dentry->d_inode, openflags, cred); 1055 if (IS_ERR(state)) 1056 state = nfs4_do_open(dir, dentry, openflags, NULL, cred); 1057 put_rpccred(cred); 1058 if (IS_ERR(state)) { 1059 switch (PTR_ERR(state)) { 1060 case -EPERM: 1061 case -EACCES: 1062 case -EDQUOT: 1063 case -ENOSPC: 1064 case -EROFS: 1065 lookup_instantiate_filp(nd, (struct dentry *)state, NULL); 1066 return 1; 1067 case -ENOENT: 1068 if (dentry->d_inode == NULL) 1069 return 1; 1070 } 1071 goto out_drop; 1072 } 1073 inode = state->inode; 1074 iput(inode); 1075 if (inode == dentry->d_inode) { 1076 nfs4_intent_set_file(nd, dentry, state); 1077 return 1; 1078 } 1079 nfs4_close_state(state, openflags); 1080 out_drop: 1081 d_drop(dentry); 1082 return 0; 1083 } 1084 1085 1086 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 1087 { 1088 struct nfs4_server_caps_res res = {}; 1089 struct rpc_message msg = { 1090 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 1091 .rpc_argp = fhandle, 1092 .rpc_resp = &res, 1093 }; 1094 int status; 1095 1096 status = rpc_call_sync(server->client, &msg, 0); 1097 if (status == 0) { 1098 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 1099 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL) 1100 server->caps |= NFS_CAP_ACLS; 1101 if (res.has_links != 0) 1102 server->caps |= NFS_CAP_HARDLINKS; 1103 if (res.has_symlinks != 0) 1104 server->caps |= NFS_CAP_SYMLINKS; 1105 server->acl_bitmask = res.acl_bitmask; 1106 } 1107 return status; 1108 } 1109 1110 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 1111 { 1112 struct nfs4_exception exception = { }; 1113 int err; 1114 do { 1115 err = nfs4_handle_exception(server, 1116 _nfs4_server_capabilities(server, fhandle), 1117 &exception); 1118 } while (exception.retry); 1119 return err; 1120 } 1121 1122 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 1123 struct nfs_fsinfo *info) 1124 { 1125 struct nfs4_lookup_root_arg args = { 1126 .bitmask = nfs4_fattr_bitmap, 1127 }; 1128 struct nfs4_lookup_res res = { 1129 .server = server, 1130 .fattr = info->fattr, 1131 .fh = fhandle, 1132 }; 1133 struct rpc_message msg = { 1134 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 1135 .rpc_argp = &args, 1136 .rpc_resp = &res, 1137 }; 1138 nfs_fattr_init(info->fattr); 1139 return rpc_call_sync(server->client, &msg, 0); 1140 } 1141 1142 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 1143 struct nfs_fsinfo *info) 1144 { 1145 struct nfs4_exception exception = { }; 1146 int err; 1147 do { 1148 err = nfs4_handle_exception(server, 1149 _nfs4_lookup_root(server, fhandle, info), 1150 &exception); 1151 } while (exception.retry); 1152 return err; 1153 } 1154 1155 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, 1156 struct nfs_fsinfo *info) 1157 { 1158 struct nfs_fattr * fattr = info->fattr; 1159 unsigned char * p; 1160 struct qstr q; 1161 struct nfs4_lookup_arg args = { 1162 .dir_fh = fhandle, 1163 .name = &q, 1164 .bitmask = nfs4_fattr_bitmap, 1165 }; 1166 struct nfs4_lookup_res res = { 1167 .server = server, 1168 .fattr = fattr, 1169 .fh = fhandle, 1170 }; 1171 struct rpc_message msg = { 1172 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 1173 .rpc_argp = &args, 1174 .rpc_resp = &res, 1175 }; 1176 int status; 1177 1178 /* 1179 * Now we do a separate LOOKUP for each component of the mount path. 1180 * The LOOKUPs are done separately so that we can conveniently 1181 * catch an ERR_WRONGSEC if it occurs along the way... 1182 */ 1183 status = nfs4_lookup_root(server, fhandle, info); 1184 if (status) 1185 goto out; 1186 1187 p = server->mnt_path; 1188 for (;;) { 1189 struct nfs4_exception exception = { }; 1190 1191 while (*p == '/') 1192 p++; 1193 if (!*p) 1194 break; 1195 q.name = p; 1196 while (*p && (*p != '/')) 1197 p++; 1198 q.len = p - q.name; 1199 1200 do { 1201 nfs_fattr_init(fattr); 1202 status = nfs4_handle_exception(server, 1203 rpc_call_sync(server->client, &msg, 0), 1204 &exception); 1205 } while (exception.retry); 1206 if (status == 0) 1207 continue; 1208 if (status == -ENOENT) { 1209 printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path); 1210 printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n"); 1211 } 1212 break; 1213 } 1214 if (status == 0) 1215 status = nfs4_server_capabilities(server, fhandle); 1216 if (status == 0) 1217 status = nfs4_do_fsinfo(server, fhandle, info); 1218 out: 1219 return status; 1220 } 1221 1222 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1223 { 1224 struct nfs4_getattr_arg args = { 1225 .fh = fhandle, 1226 .bitmask = server->attr_bitmask, 1227 }; 1228 struct nfs4_getattr_res res = { 1229 .fattr = fattr, 1230 .server = server, 1231 }; 1232 struct rpc_message msg = { 1233 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 1234 .rpc_argp = &args, 1235 .rpc_resp = &res, 1236 }; 1237 1238 nfs_fattr_init(fattr); 1239 return rpc_call_sync(server->client, &msg, 0); 1240 } 1241 1242 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1243 { 1244 struct nfs4_exception exception = { }; 1245 int err; 1246 do { 1247 err = nfs4_handle_exception(server, 1248 _nfs4_proc_getattr(server, fhandle, fattr), 1249 &exception); 1250 } while (exception.retry); 1251 return err; 1252 } 1253 1254 /* 1255 * The file is not closed if it is opened due to the a request to change 1256 * the size of the file. The open call will not be needed once the 1257 * VFS layer lookup-intents are implemented. 1258 * 1259 * Close is called when the inode is destroyed. 1260 * If we haven't opened the file for O_WRONLY, we 1261 * need to in the size_change case to obtain a stateid. 1262 * 1263 * Got race? 1264 * Because OPEN is always done by name in nfsv4, it is 1265 * possible that we opened a different file by the same 1266 * name. We can recognize this race condition, but we 1267 * can't do anything about it besides returning an error. 1268 * 1269 * This will be fixed with VFS changes (lookup-intent). 1270 */ 1271 static int 1272 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 1273 struct iattr *sattr) 1274 { 1275 struct rpc_cred *cred; 1276 struct inode *inode = dentry->d_inode; 1277 struct nfs_open_context *ctx; 1278 struct nfs4_state *state = NULL; 1279 int status; 1280 1281 nfs_fattr_init(fattr); 1282 1283 cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0); 1284 if (IS_ERR(cred)) 1285 return PTR_ERR(cred); 1286 1287 /* Search for an existing open(O_WRITE) file */ 1288 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE); 1289 if (ctx != NULL) 1290 state = ctx->state; 1291 1292 status = nfs4_do_setattr(NFS_SERVER(inode), fattr, 1293 NFS_FH(inode), sattr, state); 1294 if (status == 0) 1295 nfs_setattr_update_inode(inode, sattr); 1296 if (ctx != NULL) 1297 put_nfs_open_context(ctx); 1298 put_rpccred(cred); 1299 return status; 1300 } 1301 1302 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name, 1303 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1304 { 1305 int status; 1306 struct nfs_server *server = NFS_SERVER(dir); 1307 struct nfs4_lookup_arg args = { 1308 .bitmask = server->attr_bitmask, 1309 .dir_fh = NFS_FH(dir), 1310 .name = name, 1311 }; 1312 struct nfs4_lookup_res res = { 1313 .server = server, 1314 .fattr = fattr, 1315 .fh = fhandle, 1316 }; 1317 struct rpc_message msg = { 1318 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 1319 .rpc_argp = &args, 1320 .rpc_resp = &res, 1321 }; 1322 1323 nfs_fattr_init(fattr); 1324 1325 dprintk("NFS call lookup %s\n", name->name); 1326 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 1327 dprintk("NFS reply lookup: %d\n", status); 1328 return status; 1329 } 1330 1331 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1332 { 1333 struct nfs4_exception exception = { }; 1334 int err; 1335 do { 1336 err = nfs4_handle_exception(NFS_SERVER(dir), 1337 _nfs4_proc_lookup(dir, name, fhandle, fattr), 1338 &exception); 1339 } while (exception.retry); 1340 return err; 1341 } 1342 1343 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 1344 { 1345 struct nfs4_accessargs args = { 1346 .fh = NFS_FH(inode), 1347 }; 1348 struct nfs4_accessres res = { 0 }; 1349 struct rpc_message msg = { 1350 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 1351 .rpc_argp = &args, 1352 .rpc_resp = &res, 1353 .rpc_cred = entry->cred, 1354 }; 1355 int mode = entry->mask; 1356 int status; 1357 1358 /* 1359 * Determine which access bits we want to ask for... 1360 */ 1361 if (mode & MAY_READ) 1362 args.access |= NFS4_ACCESS_READ; 1363 if (S_ISDIR(inode->i_mode)) { 1364 if (mode & MAY_WRITE) 1365 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; 1366 if (mode & MAY_EXEC) 1367 args.access |= NFS4_ACCESS_LOOKUP; 1368 } else { 1369 if (mode & MAY_WRITE) 1370 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; 1371 if (mode & MAY_EXEC) 1372 args.access |= NFS4_ACCESS_EXECUTE; 1373 } 1374 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 1375 if (!status) { 1376 entry->mask = 0; 1377 if (res.access & NFS4_ACCESS_READ) 1378 entry->mask |= MAY_READ; 1379 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) 1380 entry->mask |= MAY_WRITE; 1381 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) 1382 entry->mask |= MAY_EXEC; 1383 } 1384 return status; 1385 } 1386 1387 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 1388 { 1389 struct nfs4_exception exception = { }; 1390 int err; 1391 do { 1392 err = nfs4_handle_exception(NFS_SERVER(inode), 1393 _nfs4_proc_access(inode, entry), 1394 &exception); 1395 } while (exception.retry); 1396 return err; 1397 } 1398 1399 /* 1400 * TODO: For the time being, we don't try to get any attributes 1401 * along with any of the zero-copy operations READ, READDIR, 1402 * READLINK, WRITE. 1403 * 1404 * In the case of the first three, we want to put the GETATTR 1405 * after the read-type operation -- this is because it is hard 1406 * to predict the length of a GETATTR response in v4, and thus 1407 * align the READ data correctly. This means that the GETATTR 1408 * may end up partially falling into the page cache, and we should 1409 * shift it into the 'tail' of the xdr_buf before processing. 1410 * To do this efficiently, we need to know the total length 1411 * of data received, which doesn't seem to be available outside 1412 * of the RPC layer. 1413 * 1414 * In the case of WRITE, we also want to put the GETATTR after 1415 * the operation -- in this case because we want to make sure 1416 * we get the post-operation mtime and size. This means that 1417 * we can't use xdr_encode_pages() as written: we need a variant 1418 * of it which would leave room in the 'tail' iovec. 1419 * 1420 * Both of these changes to the XDR layer would in fact be quite 1421 * minor, but I decided to leave them for a subsequent patch. 1422 */ 1423 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 1424 unsigned int pgbase, unsigned int pglen) 1425 { 1426 struct nfs4_readlink args = { 1427 .fh = NFS_FH(inode), 1428 .pgbase = pgbase, 1429 .pglen = pglen, 1430 .pages = &page, 1431 }; 1432 struct rpc_message msg = { 1433 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 1434 .rpc_argp = &args, 1435 .rpc_resp = NULL, 1436 }; 1437 1438 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 1439 } 1440 1441 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 1442 unsigned int pgbase, unsigned int pglen) 1443 { 1444 struct nfs4_exception exception = { }; 1445 int err; 1446 do { 1447 err = nfs4_handle_exception(NFS_SERVER(inode), 1448 _nfs4_proc_readlink(inode, page, pgbase, pglen), 1449 &exception); 1450 } while (exception.retry); 1451 return err; 1452 } 1453 1454 static int _nfs4_proc_read(struct nfs_read_data *rdata) 1455 { 1456 int flags = rdata->flags; 1457 struct inode *inode = rdata->inode; 1458 struct nfs_fattr *fattr = rdata->res.fattr; 1459 struct nfs_server *server = NFS_SERVER(inode); 1460 struct rpc_message msg = { 1461 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ], 1462 .rpc_argp = &rdata->args, 1463 .rpc_resp = &rdata->res, 1464 .rpc_cred = rdata->cred, 1465 }; 1466 unsigned long timestamp = jiffies; 1467 int status; 1468 1469 dprintk("NFS call read %d @ %Ld\n", rdata->args.count, 1470 (long long) rdata->args.offset); 1471 1472 nfs_fattr_init(fattr); 1473 status = rpc_call_sync(server->client, &msg, flags); 1474 if (!status) 1475 renew_lease(server, timestamp); 1476 dprintk("NFS reply read: %d\n", status); 1477 return status; 1478 } 1479 1480 static int nfs4_proc_read(struct nfs_read_data *rdata) 1481 { 1482 struct nfs4_exception exception = { }; 1483 int err; 1484 do { 1485 err = nfs4_handle_exception(NFS_SERVER(rdata->inode), 1486 _nfs4_proc_read(rdata), 1487 &exception); 1488 } while (exception.retry); 1489 return err; 1490 } 1491 1492 static int _nfs4_proc_write(struct nfs_write_data *wdata) 1493 { 1494 int rpcflags = wdata->flags; 1495 struct inode *inode = wdata->inode; 1496 struct nfs_fattr *fattr = wdata->res.fattr; 1497 struct nfs_server *server = NFS_SERVER(inode); 1498 struct rpc_message msg = { 1499 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE], 1500 .rpc_argp = &wdata->args, 1501 .rpc_resp = &wdata->res, 1502 .rpc_cred = wdata->cred, 1503 }; 1504 int status; 1505 1506 dprintk("NFS call write %d @ %Ld\n", wdata->args.count, 1507 (long long) wdata->args.offset); 1508 1509 nfs_fattr_init(fattr); 1510 status = rpc_call_sync(server->client, &msg, rpcflags); 1511 dprintk("NFS reply write: %d\n", status); 1512 return status; 1513 } 1514 1515 static int nfs4_proc_write(struct nfs_write_data *wdata) 1516 { 1517 struct nfs4_exception exception = { }; 1518 int err; 1519 do { 1520 err = nfs4_handle_exception(NFS_SERVER(wdata->inode), 1521 _nfs4_proc_write(wdata), 1522 &exception); 1523 } while (exception.retry); 1524 return err; 1525 } 1526 1527 static int _nfs4_proc_commit(struct nfs_write_data *cdata) 1528 { 1529 struct inode *inode = cdata->inode; 1530 struct nfs_fattr *fattr = cdata->res.fattr; 1531 struct nfs_server *server = NFS_SERVER(inode); 1532 struct rpc_message msg = { 1533 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 1534 .rpc_argp = &cdata->args, 1535 .rpc_resp = &cdata->res, 1536 .rpc_cred = cdata->cred, 1537 }; 1538 int status; 1539 1540 dprintk("NFS call commit %d @ %Ld\n", cdata->args.count, 1541 (long long) cdata->args.offset); 1542 1543 nfs_fattr_init(fattr); 1544 status = rpc_call_sync(server->client, &msg, 0); 1545 dprintk("NFS reply commit: %d\n", status); 1546 return status; 1547 } 1548 1549 static int nfs4_proc_commit(struct nfs_write_data *cdata) 1550 { 1551 struct nfs4_exception exception = { }; 1552 int err; 1553 do { 1554 err = nfs4_handle_exception(NFS_SERVER(cdata->inode), 1555 _nfs4_proc_commit(cdata), 1556 &exception); 1557 } while (exception.retry); 1558 return err; 1559 } 1560 1561 /* 1562 * Got race? 1563 * We will need to arrange for the VFS layer to provide an atomic open. 1564 * Until then, this create/open method is prone to inefficiency and race 1565 * conditions due to the lookup, create, and open VFS calls from sys_open() 1566 * placed on the wire. 1567 * 1568 * Given the above sorry state of affairs, I'm simply sending an OPEN. 1569 * The file will be opened again in the subsequent VFS open call 1570 * (nfs4_proc_file_open). 1571 * 1572 * The open for read will just hang around to be used by any process that 1573 * opens the file O_RDONLY. This will all be resolved with the VFS changes. 1574 */ 1575 1576 static int 1577 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 1578 int flags, struct nameidata *nd) 1579 { 1580 struct nfs4_state *state; 1581 struct rpc_cred *cred; 1582 int status = 0; 1583 1584 cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0); 1585 if (IS_ERR(cred)) { 1586 status = PTR_ERR(cred); 1587 goto out; 1588 } 1589 state = nfs4_do_open(dir, dentry, flags, sattr, cred); 1590 put_rpccred(cred); 1591 if (IS_ERR(state)) { 1592 status = PTR_ERR(state); 1593 goto out; 1594 } 1595 d_instantiate(dentry, state->inode); 1596 if (flags & O_EXCL) { 1597 struct nfs_fattr fattr; 1598 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr, 1599 NFS_FH(state->inode), sattr, state); 1600 if (status == 0) 1601 nfs_setattr_update_inode(state->inode, sattr); 1602 } 1603 if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN)) 1604 nfs4_intent_set_file(nd, dentry, state); 1605 else 1606 nfs4_close_state(state, flags); 1607 out: 1608 return status; 1609 } 1610 1611 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) 1612 { 1613 struct nfs_server *server = NFS_SERVER(dir); 1614 struct nfs4_remove_arg args = { 1615 .fh = NFS_FH(dir), 1616 .name = name, 1617 .bitmask = server->attr_bitmask, 1618 }; 1619 struct nfs_fattr dir_attr; 1620 struct nfs4_remove_res res = { 1621 .server = server, 1622 .dir_attr = &dir_attr, 1623 }; 1624 struct rpc_message msg = { 1625 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 1626 .rpc_argp = &args, 1627 .rpc_resp = &res, 1628 }; 1629 int status; 1630 1631 nfs_fattr_init(res.dir_attr); 1632 status = rpc_call_sync(server->client, &msg, 0); 1633 if (status == 0) { 1634 update_changeattr(dir, &res.cinfo); 1635 nfs_post_op_update_inode(dir, res.dir_attr); 1636 } 1637 return status; 1638 } 1639 1640 static int nfs4_proc_remove(struct inode *dir, struct qstr *name) 1641 { 1642 struct nfs4_exception exception = { }; 1643 int err; 1644 do { 1645 err = nfs4_handle_exception(NFS_SERVER(dir), 1646 _nfs4_proc_remove(dir, name), 1647 &exception); 1648 } while (exception.retry); 1649 return err; 1650 } 1651 1652 struct unlink_desc { 1653 struct nfs4_remove_arg args; 1654 struct nfs4_remove_res res; 1655 struct nfs_fattr dir_attr; 1656 }; 1657 1658 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, 1659 struct qstr *name) 1660 { 1661 struct nfs_server *server = NFS_SERVER(dir->d_inode); 1662 struct unlink_desc *up; 1663 1664 up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL); 1665 if (!up) 1666 return -ENOMEM; 1667 1668 up->args.fh = NFS_FH(dir->d_inode); 1669 up->args.name = name; 1670 up->args.bitmask = server->attr_bitmask; 1671 up->res.server = server; 1672 up->res.dir_attr = &up->dir_attr; 1673 1674 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 1675 msg->rpc_argp = &up->args; 1676 msg->rpc_resp = &up->res; 1677 return 0; 1678 } 1679 1680 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task) 1681 { 1682 struct rpc_message *msg = &task->tk_msg; 1683 struct unlink_desc *up; 1684 1685 if (msg->rpc_resp != NULL) { 1686 up = container_of(msg->rpc_resp, struct unlink_desc, res); 1687 update_changeattr(dir->d_inode, &up->res.cinfo); 1688 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr); 1689 kfree(up); 1690 msg->rpc_resp = NULL; 1691 msg->rpc_argp = NULL; 1692 } 1693 return 0; 1694 } 1695 1696 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, 1697 struct inode *new_dir, struct qstr *new_name) 1698 { 1699 struct nfs_server *server = NFS_SERVER(old_dir); 1700 struct nfs4_rename_arg arg = { 1701 .old_dir = NFS_FH(old_dir), 1702 .new_dir = NFS_FH(new_dir), 1703 .old_name = old_name, 1704 .new_name = new_name, 1705 .bitmask = server->attr_bitmask, 1706 }; 1707 struct nfs_fattr old_fattr, new_fattr; 1708 struct nfs4_rename_res res = { 1709 .server = server, 1710 .old_fattr = &old_fattr, 1711 .new_fattr = &new_fattr, 1712 }; 1713 struct rpc_message msg = { 1714 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME], 1715 .rpc_argp = &arg, 1716 .rpc_resp = &res, 1717 }; 1718 int status; 1719 1720 nfs_fattr_init(res.old_fattr); 1721 nfs_fattr_init(res.new_fattr); 1722 status = rpc_call_sync(server->client, &msg, 0); 1723 1724 if (!status) { 1725 update_changeattr(old_dir, &res.old_cinfo); 1726 nfs_post_op_update_inode(old_dir, res.old_fattr); 1727 update_changeattr(new_dir, &res.new_cinfo); 1728 nfs_post_op_update_inode(new_dir, res.new_fattr); 1729 } 1730 return status; 1731 } 1732 1733 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, 1734 struct inode *new_dir, struct qstr *new_name) 1735 { 1736 struct nfs4_exception exception = { }; 1737 int err; 1738 do { 1739 err = nfs4_handle_exception(NFS_SERVER(old_dir), 1740 _nfs4_proc_rename(old_dir, old_name, 1741 new_dir, new_name), 1742 &exception); 1743 } while (exception.retry); 1744 return err; 1745 } 1746 1747 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 1748 { 1749 struct nfs_server *server = NFS_SERVER(inode); 1750 struct nfs4_link_arg arg = { 1751 .fh = NFS_FH(inode), 1752 .dir_fh = NFS_FH(dir), 1753 .name = name, 1754 .bitmask = server->attr_bitmask, 1755 }; 1756 struct nfs_fattr fattr, dir_attr; 1757 struct nfs4_link_res res = { 1758 .server = server, 1759 .fattr = &fattr, 1760 .dir_attr = &dir_attr, 1761 }; 1762 struct rpc_message msg = { 1763 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 1764 .rpc_argp = &arg, 1765 .rpc_resp = &res, 1766 }; 1767 int status; 1768 1769 nfs_fattr_init(res.fattr); 1770 nfs_fattr_init(res.dir_attr); 1771 status = rpc_call_sync(server->client, &msg, 0); 1772 if (!status) { 1773 update_changeattr(dir, &res.cinfo); 1774 nfs_post_op_update_inode(dir, res.dir_attr); 1775 nfs_refresh_inode(inode, res.fattr); 1776 } 1777 1778 return status; 1779 } 1780 1781 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 1782 { 1783 struct nfs4_exception exception = { }; 1784 int err; 1785 do { 1786 err = nfs4_handle_exception(NFS_SERVER(inode), 1787 _nfs4_proc_link(inode, dir, name), 1788 &exception); 1789 } while (exception.retry); 1790 return err; 1791 } 1792 1793 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name, 1794 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle, 1795 struct nfs_fattr *fattr) 1796 { 1797 struct nfs_server *server = NFS_SERVER(dir); 1798 struct nfs_fattr dir_fattr; 1799 struct nfs4_create_arg arg = { 1800 .dir_fh = NFS_FH(dir), 1801 .server = server, 1802 .name = name, 1803 .attrs = sattr, 1804 .ftype = NF4LNK, 1805 .bitmask = server->attr_bitmask, 1806 }; 1807 struct nfs4_create_res res = { 1808 .server = server, 1809 .fh = fhandle, 1810 .fattr = fattr, 1811 .dir_fattr = &dir_fattr, 1812 }; 1813 struct rpc_message msg = { 1814 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK], 1815 .rpc_argp = &arg, 1816 .rpc_resp = &res, 1817 }; 1818 int status; 1819 1820 if (path->len > NFS4_MAXPATHLEN) 1821 return -ENAMETOOLONG; 1822 arg.u.symlink = path; 1823 nfs_fattr_init(fattr); 1824 nfs_fattr_init(&dir_fattr); 1825 1826 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 1827 if (!status) 1828 update_changeattr(dir, &res.dir_cinfo); 1829 nfs_post_op_update_inode(dir, res.dir_fattr); 1830 return status; 1831 } 1832 1833 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name, 1834 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle, 1835 struct nfs_fattr *fattr) 1836 { 1837 struct nfs4_exception exception = { }; 1838 int err; 1839 do { 1840 err = nfs4_handle_exception(NFS_SERVER(dir), 1841 _nfs4_proc_symlink(dir, name, path, sattr, 1842 fhandle, fattr), 1843 &exception); 1844 } while (exception.retry); 1845 return err; 1846 } 1847 1848 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 1849 struct iattr *sattr) 1850 { 1851 struct nfs_server *server = NFS_SERVER(dir); 1852 struct nfs_fh fhandle; 1853 struct nfs_fattr fattr, dir_fattr; 1854 struct nfs4_create_arg arg = { 1855 .dir_fh = NFS_FH(dir), 1856 .server = server, 1857 .name = &dentry->d_name, 1858 .attrs = sattr, 1859 .ftype = NF4DIR, 1860 .bitmask = server->attr_bitmask, 1861 }; 1862 struct nfs4_create_res res = { 1863 .server = server, 1864 .fh = &fhandle, 1865 .fattr = &fattr, 1866 .dir_fattr = &dir_fattr, 1867 }; 1868 struct rpc_message msg = { 1869 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], 1870 .rpc_argp = &arg, 1871 .rpc_resp = &res, 1872 }; 1873 int status; 1874 1875 nfs_fattr_init(&fattr); 1876 nfs_fattr_init(&dir_fattr); 1877 1878 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 1879 if (!status) { 1880 update_changeattr(dir, &res.dir_cinfo); 1881 nfs_post_op_update_inode(dir, res.dir_fattr); 1882 status = nfs_instantiate(dentry, &fhandle, &fattr); 1883 } 1884 return status; 1885 } 1886 1887 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 1888 struct iattr *sattr) 1889 { 1890 struct nfs4_exception exception = { }; 1891 int err; 1892 do { 1893 err = nfs4_handle_exception(NFS_SERVER(dir), 1894 _nfs4_proc_mkdir(dir, dentry, sattr), 1895 &exception); 1896 } while (exception.retry); 1897 return err; 1898 } 1899 1900 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 1901 u64 cookie, struct page *page, unsigned int count, int plus) 1902 { 1903 struct inode *dir = dentry->d_inode; 1904 struct nfs4_readdir_arg args = { 1905 .fh = NFS_FH(dir), 1906 .pages = &page, 1907 .pgbase = 0, 1908 .count = count, 1909 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, 1910 }; 1911 struct nfs4_readdir_res res; 1912 struct rpc_message msg = { 1913 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 1914 .rpc_argp = &args, 1915 .rpc_resp = &res, 1916 .rpc_cred = cred, 1917 }; 1918 int status; 1919 1920 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__, 1921 dentry->d_parent->d_name.name, 1922 dentry->d_name.name, 1923 (unsigned long long)cookie); 1924 lock_kernel(); 1925 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args); 1926 res.pgbase = args.pgbase; 1927 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 1928 if (status == 0) 1929 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE); 1930 unlock_kernel(); 1931 dprintk("%s: returns %d\n", __FUNCTION__, status); 1932 return status; 1933 } 1934 1935 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 1936 u64 cookie, struct page *page, unsigned int count, int plus) 1937 { 1938 struct nfs4_exception exception = { }; 1939 int err; 1940 do { 1941 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), 1942 _nfs4_proc_readdir(dentry, cred, cookie, 1943 page, count, plus), 1944 &exception); 1945 } while (exception.retry); 1946 return err; 1947 } 1948 1949 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 1950 struct iattr *sattr, dev_t rdev) 1951 { 1952 struct nfs_server *server = NFS_SERVER(dir); 1953 struct nfs_fh fh; 1954 struct nfs_fattr fattr, dir_fattr; 1955 struct nfs4_create_arg arg = { 1956 .dir_fh = NFS_FH(dir), 1957 .server = server, 1958 .name = &dentry->d_name, 1959 .attrs = sattr, 1960 .bitmask = server->attr_bitmask, 1961 }; 1962 struct nfs4_create_res res = { 1963 .server = server, 1964 .fh = &fh, 1965 .fattr = &fattr, 1966 .dir_fattr = &dir_fattr, 1967 }; 1968 struct rpc_message msg = { 1969 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], 1970 .rpc_argp = &arg, 1971 .rpc_resp = &res, 1972 }; 1973 int status; 1974 int mode = sattr->ia_mode; 1975 1976 nfs_fattr_init(&fattr); 1977 nfs_fattr_init(&dir_fattr); 1978 1979 BUG_ON(!(sattr->ia_valid & ATTR_MODE)); 1980 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode)); 1981 if (S_ISFIFO(mode)) 1982 arg.ftype = NF4FIFO; 1983 else if (S_ISBLK(mode)) { 1984 arg.ftype = NF4BLK; 1985 arg.u.device.specdata1 = MAJOR(rdev); 1986 arg.u.device.specdata2 = MINOR(rdev); 1987 } 1988 else if (S_ISCHR(mode)) { 1989 arg.ftype = NF4CHR; 1990 arg.u.device.specdata1 = MAJOR(rdev); 1991 arg.u.device.specdata2 = MINOR(rdev); 1992 } 1993 else 1994 arg.ftype = NF4SOCK; 1995 1996 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 1997 if (status == 0) { 1998 update_changeattr(dir, &res.dir_cinfo); 1999 nfs_post_op_update_inode(dir, res.dir_fattr); 2000 status = nfs_instantiate(dentry, &fh, &fattr); 2001 } 2002 return status; 2003 } 2004 2005 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 2006 struct iattr *sattr, dev_t rdev) 2007 { 2008 struct nfs4_exception exception = { }; 2009 int err; 2010 do { 2011 err = nfs4_handle_exception(NFS_SERVER(dir), 2012 _nfs4_proc_mknod(dir, dentry, sattr, rdev), 2013 &exception); 2014 } while (exception.retry); 2015 return err; 2016 } 2017 2018 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 2019 struct nfs_fsstat *fsstat) 2020 { 2021 struct nfs4_statfs_arg args = { 2022 .fh = fhandle, 2023 .bitmask = server->attr_bitmask, 2024 }; 2025 struct rpc_message msg = { 2026 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 2027 .rpc_argp = &args, 2028 .rpc_resp = fsstat, 2029 }; 2030 2031 nfs_fattr_init(fsstat->fattr); 2032 return rpc_call_sync(server->client, &msg, 0); 2033 } 2034 2035 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 2036 { 2037 struct nfs4_exception exception = { }; 2038 int err; 2039 do { 2040 err = nfs4_handle_exception(server, 2041 _nfs4_proc_statfs(server, fhandle, fsstat), 2042 &exception); 2043 } while (exception.retry); 2044 return err; 2045 } 2046 2047 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 2048 struct nfs_fsinfo *fsinfo) 2049 { 2050 struct nfs4_fsinfo_arg args = { 2051 .fh = fhandle, 2052 .bitmask = server->attr_bitmask, 2053 }; 2054 struct rpc_message msg = { 2055 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 2056 .rpc_argp = &args, 2057 .rpc_resp = fsinfo, 2058 }; 2059 2060 return rpc_call_sync(server->client, &msg, 0); 2061 } 2062 2063 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 2064 { 2065 struct nfs4_exception exception = { }; 2066 int err; 2067 2068 do { 2069 err = nfs4_handle_exception(server, 2070 _nfs4_do_fsinfo(server, fhandle, fsinfo), 2071 &exception); 2072 } while (exception.retry); 2073 return err; 2074 } 2075 2076 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 2077 { 2078 nfs_fattr_init(fsinfo->fattr); 2079 return nfs4_do_fsinfo(server, fhandle, fsinfo); 2080 } 2081 2082 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 2083 struct nfs_pathconf *pathconf) 2084 { 2085 struct nfs4_pathconf_arg args = { 2086 .fh = fhandle, 2087 .bitmask = server->attr_bitmask, 2088 }; 2089 struct rpc_message msg = { 2090 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 2091 .rpc_argp = &args, 2092 .rpc_resp = pathconf, 2093 }; 2094 2095 /* None of the pathconf attributes are mandatory to implement */ 2096 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 2097 memset(pathconf, 0, sizeof(*pathconf)); 2098 return 0; 2099 } 2100 2101 nfs_fattr_init(pathconf->fattr); 2102 return rpc_call_sync(server->client, &msg, 0); 2103 } 2104 2105 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 2106 struct nfs_pathconf *pathconf) 2107 { 2108 struct nfs4_exception exception = { }; 2109 int err; 2110 2111 do { 2112 err = nfs4_handle_exception(server, 2113 _nfs4_proc_pathconf(server, fhandle, pathconf), 2114 &exception); 2115 } while (exception.retry); 2116 return err; 2117 } 2118 2119 static void 2120 nfs4_read_done(struct rpc_task *task) 2121 { 2122 struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata; 2123 struct inode *inode = data->inode; 2124 2125 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { 2126 rpc_restart_call(task); 2127 return; 2128 } 2129 if (task->tk_status > 0) 2130 renew_lease(NFS_SERVER(inode), data->timestamp); 2131 /* Call back common NFS readpage processing */ 2132 nfs_readpage_result(task); 2133 } 2134 2135 static void 2136 nfs4_proc_read_setup(struct nfs_read_data *data) 2137 { 2138 struct rpc_task *task = &data->task; 2139 struct rpc_message msg = { 2140 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ], 2141 .rpc_argp = &data->args, 2142 .rpc_resp = &data->res, 2143 .rpc_cred = data->cred, 2144 }; 2145 struct inode *inode = data->inode; 2146 int flags; 2147 2148 data->timestamp = jiffies; 2149 2150 /* N.B. Do we need to test? Never called for swapfile inode */ 2151 flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0); 2152 2153 /* Finalize the task. */ 2154 rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags); 2155 rpc_call_setup(task, &msg, 0); 2156 } 2157 2158 static void 2159 nfs4_write_done(struct rpc_task *task) 2160 { 2161 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata; 2162 struct inode *inode = data->inode; 2163 2164 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { 2165 rpc_restart_call(task); 2166 return; 2167 } 2168 if (task->tk_status >= 0) { 2169 renew_lease(NFS_SERVER(inode), data->timestamp); 2170 nfs_post_op_update_inode(inode, data->res.fattr); 2171 } 2172 /* Call back common NFS writeback processing */ 2173 nfs_writeback_done(task); 2174 } 2175 2176 static void 2177 nfs4_proc_write_setup(struct nfs_write_data *data, int how) 2178 { 2179 struct rpc_task *task = &data->task; 2180 struct rpc_message msg = { 2181 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE], 2182 .rpc_argp = &data->args, 2183 .rpc_resp = &data->res, 2184 .rpc_cred = data->cred, 2185 }; 2186 struct inode *inode = data->inode; 2187 struct nfs_server *server = NFS_SERVER(inode); 2188 int stable; 2189 int flags; 2190 2191 if (how & FLUSH_STABLE) { 2192 if (!NFS_I(inode)->ncommit) 2193 stable = NFS_FILE_SYNC; 2194 else 2195 stable = NFS_DATA_SYNC; 2196 } else 2197 stable = NFS_UNSTABLE; 2198 data->args.stable = stable; 2199 data->args.bitmask = server->attr_bitmask; 2200 data->res.server = server; 2201 2202 data->timestamp = jiffies; 2203 2204 /* Set the initial flags for the task. */ 2205 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 2206 2207 /* Finalize the task. */ 2208 rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags); 2209 rpc_call_setup(task, &msg, 0); 2210 } 2211 2212 static void 2213 nfs4_commit_done(struct rpc_task *task) 2214 { 2215 struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata; 2216 struct inode *inode = data->inode; 2217 2218 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { 2219 rpc_restart_call(task); 2220 return; 2221 } 2222 if (task->tk_status >= 0) 2223 nfs_post_op_update_inode(inode, data->res.fattr); 2224 /* Call back common NFS writeback processing */ 2225 nfs_commit_done(task); 2226 } 2227 2228 static void 2229 nfs4_proc_commit_setup(struct nfs_write_data *data, int how) 2230 { 2231 struct rpc_task *task = &data->task; 2232 struct rpc_message msg = { 2233 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 2234 .rpc_argp = &data->args, 2235 .rpc_resp = &data->res, 2236 .rpc_cred = data->cred, 2237 }; 2238 struct inode *inode = data->inode; 2239 struct nfs_server *server = NFS_SERVER(inode); 2240 int flags; 2241 2242 data->args.bitmask = server->attr_bitmask; 2243 data->res.server = server; 2244 2245 /* Set the initial flags for the task. */ 2246 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 2247 2248 /* Finalize the task. */ 2249 rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags); 2250 rpc_call_setup(task, &msg, 0); 2251 } 2252 2253 /* 2254 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 2255 * standalone procedure for queueing an asynchronous RENEW. 2256 */ 2257 static void 2258 renew_done(struct rpc_task *task) 2259 { 2260 struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp; 2261 unsigned long timestamp = (unsigned long)task->tk_calldata; 2262 2263 if (task->tk_status < 0) { 2264 switch (task->tk_status) { 2265 case -NFS4ERR_STALE_CLIENTID: 2266 case -NFS4ERR_EXPIRED: 2267 case -NFS4ERR_CB_PATH_DOWN: 2268 nfs4_schedule_state_recovery(clp); 2269 } 2270 return; 2271 } 2272 spin_lock(&clp->cl_lock); 2273 if (time_before(clp->cl_last_renewal,timestamp)) 2274 clp->cl_last_renewal = timestamp; 2275 spin_unlock(&clp->cl_lock); 2276 } 2277 2278 int 2279 nfs4_proc_async_renew(struct nfs4_client *clp) 2280 { 2281 struct rpc_message msg = { 2282 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 2283 .rpc_argp = clp, 2284 .rpc_cred = clp->cl_cred, 2285 }; 2286 2287 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT, 2288 renew_done, (void *)jiffies); 2289 } 2290 2291 int 2292 nfs4_proc_renew(struct nfs4_client *clp) 2293 { 2294 struct rpc_message msg = { 2295 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 2296 .rpc_argp = clp, 2297 .rpc_cred = clp->cl_cred, 2298 }; 2299 unsigned long now = jiffies; 2300 int status; 2301 2302 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 2303 if (status < 0) 2304 return status; 2305 spin_lock(&clp->cl_lock); 2306 if (time_before(clp->cl_last_renewal,now)) 2307 clp->cl_last_renewal = now; 2308 spin_unlock(&clp->cl_lock); 2309 return 0; 2310 } 2311 2312 static inline int nfs4_server_supports_acls(struct nfs_server *server) 2313 { 2314 return (server->caps & NFS_CAP_ACLS) 2315 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 2316 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL); 2317 } 2318 2319 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that 2320 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on 2321 * the stack. 2322 */ 2323 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT) 2324 2325 static void buf_to_pages(const void *buf, size_t buflen, 2326 struct page **pages, unsigned int *pgbase) 2327 { 2328 const void *p = buf; 2329 2330 *pgbase = offset_in_page(buf); 2331 p -= *pgbase; 2332 while (p < buf + buflen) { 2333 *(pages++) = virt_to_page(p); 2334 p += PAGE_CACHE_SIZE; 2335 } 2336 } 2337 2338 struct nfs4_cached_acl { 2339 int cached; 2340 size_t len; 2341 char data[0]; 2342 }; 2343 2344 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 2345 { 2346 struct nfs_inode *nfsi = NFS_I(inode); 2347 2348 spin_lock(&inode->i_lock); 2349 kfree(nfsi->nfs4_acl); 2350 nfsi->nfs4_acl = acl; 2351 spin_unlock(&inode->i_lock); 2352 } 2353 2354 static void nfs4_zap_acl_attr(struct inode *inode) 2355 { 2356 nfs4_set_cached_acl(inode, NULL); 2357 } 2358 2359 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 2360 { 2361 struct nfs_inode *nfsi = NFS_I(inode); 2362 struct nfs4_cached_acl *acl; 2363 int ret = -ENOENT; 2364 2365 spin_lock(&inode->i_lock); 2366 acl = nfsi->nfs4_acl; 2367 if (acl == NULL) 2368 goto out; 2369 if (buf == NULL) /* user is just asking for length */ 2370 goto out_len; 2371 if (acl->cached == 0) 2372 goto out; 2373 ret = -ERANGE; /* see getxattr(2) man page */ 2374 if (acl->len > buflen) 2375 goto out; 2376 memcpy(buf, acl->data, acl->len); 2377 out_len: 2378 ret = acl->len; 2379 out: 2380 spin_unlock(&inode->i_lock); 2381 return ret; 2382 } 2383 2384 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len) 2385 { 2386 struct nfs4_cached_acl *acl; 2387 2388 if (buf && acl_len <= PAGE_SIZE) { 2389 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL); 2390 if (acl == NULL) 2391 goto out; 2392 acl->cached = 1; 2393 memcpy(acl->data, buf, acl_len); 2394 } else { 2395 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 2396 if (acl == NULL) 2397 goto out; 2398 acl->cached = 0; 2399 } 2400 acl->len = acl_len; 2401 out: 2402 nfs4_set_cached_acl(inode, acl); 2403 } 2404 2405 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 2406 { 2407 struct page *pages[NFS4ACL_MAXPAGES]; 2408 struct nfs_getaclargs args = { 2409 .fh = NFS_FH(inode), 2410 .acl_pages = pages, 2411 .acl_len = buflen, 2412 }; 2413 size_t resp_len = buflen; 2414 void *resp_buf; 2415 struct rpc_message msg = { 2416 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 2417 .rpc_argp = &args, 2418 .rpc_resp = &resp_len, 2419 }; 2420 struct page *localpage = NULL; 2421 int ret; 2422 2423 if (buflen < PAGE_SIZE) { 2424 /* As long as we're doing a round trip to the server anyway, 2425 * let's be prepared for a page of acl data. */ 2426 localpage = alloc_page(GFP_KERNEL); 2427 resp_buf = page_address(localpage); 2428 if (localpage == NULL) 2429 return -ENOMEM; 2430 args.acl_pages[0] = localpage; 2431 args.acl_pgbase = 0; 2432 resp_len = args.acl_len = PAGE_SIZE; 2433 } else { 2434 resp_buf = buf; 2435 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase); 2436 } 2437 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 2438 if (ret) 2439 goto out_free; 2440 if (resp_len > args.acl_len) 2441 nfs4_write_cached_acl(inode, NULL, resp_len); 2442 else 2443 nfs4_write_cached_acl(inode, resp_buf, resp_len); 2444 if (buf) { 2445 ret = -ERANGE; 2446 if (resp_len > buflen) 2447 goto out_free; 2448 if (localpage) 2449 memcpy(buf, resp_buf, resp_len); 2450 } 2451 ret = resp_len; 2452 out_free: 2453 if (localpage) 2454 __free_page(localpage); 2455 return ret; 2456 } 2457 2458 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 2459 { 2460 struct nfs_server *server = NFS_SERVER(inode); 2461 int ret; 2462 2463 if (!nfs4_server_supports_acls(server)) 2464 return -EOPNOTSUPP; 2465 ret = nfs_revalidate_inode(server, inode); 2466 if (ret < 0) 2467 return ret; 2468 ret = nfs4_read_cached_acl(inode, buf, buflen); 2469 if (ret != -ENOENT) 2470 return ret; 2471 return nfs4_get_acl_uncached(inode, buf, buflen); 2472 } 2473 2474 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 2475 { 2476 struct nfs_server *server = NFS_SERVER(inode); 2477 struct page *pages[NFS4ACL_MAXPAGES]; 2478 struct nfs_setaclargs arg = { 2479 .fh = NFS_FH(inode), 2480 .acl_pages = pages, 2481 .acl_len = buflen, 2482 }; 2483 struct rpc_message msg = { 2484 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 2485 .rpc_argp = &arg, 2486 .rpc_resp = NULL, 2487 }; 2488 int ret; 2489 2490 if (!nfs4_server_supports_acls(server)) 2491 return -EOPNOTSUPP; 2492 nfs_inode_return_delegation(inode); 2493 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase); 2494 ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0); 2495 if (ret == 0) 2496 nfs4_write_cached_acl(inode, buf, buflen); 2497 return ret; 2498 } 2499 2500 static int 2501 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server) 2502 { 2503 struct nfs4_client *clp = server->nfs4_state; 2504 2505 if (!clp || task->tk_status >= 0) 2506 return 0; 2507 switch(task->tk_status) { 2508 case -NFS4ERR_STALE_CLIENTID: 2509 case -NFS4ERR_STALE_STATEID: 2510 case -NFS4ERR_EXPIRED: 2511 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL); 2512 nfs4_schedule_state_recovery(clp); 2513 if (test_bit(NFS4CLNT_OK, &clp->cl_state)) 2514 rpc_wake_up_task(task); 2515 task->tk_status = 0; 2516 return -EAGAIN; 2517 case -NFS4ERR_GRACE: 2518 case -NFS4ERR_DELAY: 2519 rpc_delay(task, NFS4_POLL_RETRY_MAX); 2520 task->tk_status = 0; 2521 return -EAGAIN; 2522 case -NFS4ERR_OLD_STATEID: 2523 task->tk_status = 0; 2524 return -EAGAIN; 2525 } 2526 task->tk_status = nfs4_map_errors(task->tk_status); 2527 return 0; 2528 } 2529 2530 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp) 2531 { 2532 DEFINE_WAIT(wait); 2533 sigset_t oldset; 2534 int interruptible, res = 0; 2535 2536 might_sleep(); 2537 2538 rpc_clnt_sigmask(clnt, &oldset); 2539 interruptible = TASK_UNINTERRUPTIBLE; 2540 if (clnt->cl_intr) 2541 interruptible = TASK_INTERRUPTIBLE; 2542 prepare_to_wait(&clp->cl_waitq, &wait, interruptible); 2543 nfs4_schedule_state_recovery(clp); 2544 if (clnt->cl_intr && signalled()) 2545 res = -ERESTARTSYS; 2546 else if (!test_bit(NFS4CLNT_OK, &clp->cl_state)) 2547 schedule(); 2548 finish_wait(&clp->cl_waitq, &wait); 2549 rpc_clnt_sigunmask(clnt, &oldset); 2550 return res; 2551 } 2552 2553 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 2554 { 2555 sigset_t oldset; 2556 int res = 0; 2557 2558 might_sleep(); 2559 2560 if (*timeout <= 0) 2561 *timeout = NFS4_POLL_RETRY_MIN; 2562 if (*timeout > NFS4_POLL_RETRY_MAX) 2563 *timeout = NFS4_POLL_RETRY_MAX; 2564 rpc_clnt_sigmask(clnt, &oldset); 2565 if (clnt->cl_intr) { 2566 schedule_timeout_interruptible(*timeout); 2567 if (signalled()) 2568 res = -ERESTARTSYS; 2569 } else 2570 schedule_timeout_uninterruptible(*timeout); 2571 rpc_clnt_sigunmask(clnt, &oldset); 2572 *timeout <<= 1; 2573 return res; 2574 } 2575 2576 /* This is the error handling routine for processes that are allowed 2577 * to sleep. 2578 */ 2579 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 2580 { 2581 struct nfs4_client *clp = server->nfs4_state; 2582 int ret = errorcode; 2583 2584 exception->retry = 0; 2585 switch(errorcode) { 2586 case 0: 2587 return 0; 2588 case -NFS4ERR_STALE_CLIENTID: 2589 case -NFS4ERR_STALE_STATEID: 2590 case -NFS4ERR_EXPIRED: 2591 ret = nfs4_wait_clnt_recover(server->client, clp); 2592 if (ret == 0) 2593 exception->retry = 1; 2594 break; 2595 case -NFS4ERR_GRACE: 2596 case -NFS4ERR_DELAY: 2597 ret = nfs4_delay(server->client, &exception->timeout); 2598 if (ret != 0) 2599 break; 2600 case -NFS4ERR_OLD_STATEID: 2601 exception->retry = 1; 2602 } 2603 /* We failed to handle the error */ 2604 return nfs4_map_errors(ret); 2605 } 2606 2607 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port) 2608 { 2609 nfs4_verifier sc_verifier; 2610 struct nfs4_setclientid setclientid = { 2611 .sc_verifier = &sc_verifier, 2612 .sc_prog = program, 2613 }; 2614 struct rpc_message msg = { 2615 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 2616 .rpc_argp = &setclientid, 2617 .rpc_resp = clp, 2618 .rpc_cred = clp->cl_cred, 2619 }; 2620 u32 *p; 2621 int loop = 0; 2622 int status; 2623 2624 p = (u32*)sc_verifier.data; 2625 *p++ = htonl((u32)clp->cl_boot_time.tv_sec); 2626 *p = htonl((u32)clp->cl_boot_time.tv_nsec); 2627 2628 for(;;) { 2629 setclientid.sc_name_len = scnprintf(setclientid.sc_name, 2630 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u", 2631 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr), 2632 clp->cl_cred->cr_ops->cr_name, 2633 clp->cl_id_uniquifier); 2634 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid, 2635 sizeof(setclientid.sc_netid), "tcp"); 2636 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 2637 sizeof(setclientid.sc_uaddr), "%s.%d.%d", 2638 clp->cl_ipaddr, port >> 8, port & 255); 2639 2640 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 2641 if (status != -NFS4ERR_CLID_INUSE) 2642 break; 2643 if (signalled()) 2644 break; 2645 if (loop++ & 1) 2646 ssleep(clp->cl_lease_time + 1); 2647 else 2648 if (++clp->cl_id_uniquifier == 0) 2649 break; 2650 } 2651 return status; 2652 } 2653 2654 int 2655 nfs4_proc_setclientid_confirm(struct nfs4_client *clp) 2656 { 2657 struct nfs_fsinfo fsinfo; 2658 struct rpc_message msg = { 2659 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 2660 .rpc_argp = clp, 2661 .rpc_resp = &fsinfo, 2662 .rpc_cred = clp->cl_cred, 2663 }; 2664 unsigned long now; 2665 int status; 2666 2667 now = jiffies; 2668 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 2669 if (status == 0) { 2670 spin_lock(&clp->cl_lock); 2671 clp->cl_lease_time = fsinfo.lease_time * HZ; 2672 clp->cl_last_renewal = now; 2673 spin_unlock(&clp->cl_lock); 2674 } 2675 return status; 2676 } 2677 2678 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid) 2679 { 2680 struct nfs4_delegreturnargs args = { 2681 .fhandle = NFS_FH(inode), 2682 .stateid = stateid, 2683 }; 2684 struct rpc_message msg = { 2685 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 2686 .rpc_argp = &args, 2687 .rpc_cred = cred, 2688 }; 2689 2690 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 2691 } 2692 2693 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid) 2694 { 2695 struct nfs_server *server = NFS_SERVER(inode); 2696 struct nfs4_exception exception = { }; 2697 int err; 2698 do { 2699 err = _nfs4_proc_delegreturn(inode, cred, stateid); 2700 switch (err) { 2701 case -NFS4ERR_STALE_STATEID: 2702 case -NFS4ERR_EXPIRED: 2703 nfs4_schedule_state_recovery(server->nfs4_state); 2704 case 0: 2705 return 0; 2706 } 2707 err = nfs4_handle_exception(server, err, &exception); 2708 } while (exception.retry); 2709 return err; 2710 } 2711 2712 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 2713 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 2714 2715 /* 2716 * sleep, with exponential backoff, and retry the LOCK operation. 2717 */ 2718 static unsigned long 2719 nfs4_set_lock_task_retry(unsigned long timeout) 2720 { 2721 schedule_timeout_interruptible(timeout); 2722 timeout <<= 1; 2723 if (timeout > NFS4_LOCK_MAXTIMEOUT) 2724 return NFS4_LOCK_MAXTIMEOUT; 2725 return timeout; 2726 } 2727 2728 static inline int 2729 nfs4_lck_type(int cmd, struct file_lock *request) 2730 { 2731 /* set lock type */ 2732 switch (request->fl_type) { 2733 case F_RDLCK: 2734 return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT; 2735 case F_WRLCK: 2736 return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT; 2737 case F_UNLCK: 2738 return NFS4_WRITE_LT; 2739 } 2740 BUG(); 2741 return 0; 2742 } 2743 2744 static inline uint64_t 2745 nfs4_lck_length(struct file_lock *request) 2746 { 2747 if (request->fl_end == OFFSET_MAX) 2748 return ~(uint64_t)0; 2749 return request->fl_end - request->fl_start + 1; 2750 } 2751 2752 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 2753 { 2754 struct inode *inode = state->inode; 2755 struct nfs_server *server = NFS_SERVER(inode); 2756 struct nfs4_client *clp = server->nfs4_state; 2757 struct nfs_lockargs arg = { 2758 .fh = NFS_FH(inode), 2759 .type = nfs4_lck_type(cmd, request), 2760 .offset = request->fl_start, 2761 .length = nfs4_lck_length(request), 2762 }; 2763 struct nfs_lockres res = { 2764 .server = server, 2765 }; 2766 struct rpc_message msg = { 2767 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 2768 .rpc_argp = &arg, 2769 .rpc_resp = &res, 2770 .rpc_cred = state->owner->so_cred, 2771 }; 2772 struct nfs_lowner nlo; 2773 struct nfs4_lock_state *lsp; 2774 int status; 2775 2776 down_read(&clp->cl_sem); 2777 nlo.clientid = clp->cl_clientid; 2778 status = nfs4_set_lock_state(state, request); 2779 if (status != 0) 2780 goto out; 2781 lsp = request->fl_u.nfs4_fl.owner; 2782 nlo.id = lsp->ls_id; 2783 arg.u.lockt = &nlo; 2784 status = rpc_call_sync(server->client, &msg, 0); 2785 if (!status) { 2786 request->fl_type = F_UNLCK; 2787 } else if (status == -NFS4ERR_DENIED) { 2788 int64_t len, start, end; 2789 start = res.u.denied.offset; 2790 len = res.u.denied.length; 2791 end = start + len - 1; 2792 if (end < 0 || len == 0) 2793 request->fl_end = OFFSET_MAX; 2794 else 2795 request->fl_end = (loff_t)end; 2796 request->fl_start = (loff_t)start; 2797 request->fl_type = F_WRLCK; 2798 if (res.u.denied.type & 1) 2799 request->fl_type = F_RDLCK; 2800 request->fl_pid = 0; 2801 status = 0; 2802 } 2803 out: 2804 up_read(&clp->cl_sem); 2805 return status; 2806 } 2807 2808 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 2809 { 2810 struct nfs4_exception exception = { }; 2811 int err; 2812 2813 do { 2814 err = nfs4_handle_exception(NFS_SERVER(state->inode), 2815 _nfs4_proc_getlk(state, cmd, request), 2816 &exception); 2817 } while (exception.retry); 2818 return err; 2819 } 2820 2821 static int do_vfs_lock(struct file *file, struct file_lock *fl) 2822 { 2823 int res = 0; 2824 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 2825 case FL_POSIX: 2826 res = posix_lock_file_wait(file, fl); 2827 break; 2828 case FL_FLOCK: 2829 res = flock_lock_file_wait(file, fl); 2830 break; 2831 default: 2832 BUG(); 2833 } 2834 if (res < 0) 2835 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", 2836 __FUNCTION__); 2837 return res; 2838 } 2839 2840 struct nfs4_unlockdata { 2841 struct nfs_lockargs arg; 2842 struct nfs_locku_opargs luargs; 2843 struct nfs_lockres res; 2844 struct nfs4_lock_state *lsp; 2845 struct nfs_open_context *ctx; 2846 atomic_t refcount; 2847 struct completion completion; 2848 }; 2849 2850 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata) 2851 { 2852 if (atomic_dec_and_test(&calldata->refcount)) { 2853 nfs_free_seqid(calldata->luargs.seqid); 2854 nfs4_put_lock_state(calldata->lsp); 2855 put_nfs_open_context(calldata->ctx); 2856 kfree(calldata); 2857 } 2858 } 2859 2860 static void nfs4_locku_complete(struct nfs4_unlockdata *calldata) 2861 { 2862 complete(&calldata->completion); 2863 nfs4_locku_release_calldata(calldata); 2864 } 2865 2866 static void nfs4_locku_done(struct rpc_task *task) 2867 { 2868 struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata; 2869 2870 nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid); 2871 switch (task->tk_status) { 2872 case 0: 2873 memcpy(calldata->lsp->ls_stateid.data, 2874 calldata->res.u.stateid.data, 2875 sizeof(calldata->lsp->ls_stateid.data)); 2876 break; 2877 case -NFS4ERR_STALE_STATEID: 2878 case -NFS4ERR_EXPIRED: 2879 nfs4_schedule_state_recovery(calldata->res.server->nfs4_state); 2880 break; 2881 default: 2882 if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) { 2883 rpc_restart_call(task); 2884 return; 2885 } 2886 } 2887 nfs4_locku_complete(calldata); 2888 } 2889 2890 static void nfs4_locku_begin(struct rpc_task *task) 2891 { 2892 struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata; 2893 struct rpc_message msg = { 2894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 2895 .rpc_argp = &calldata->arg, 2896 .rpc_resp = &calldata->res, 2897 .rpc_cred = calldata->lsp->ls_state->owner->so_cred, 2898 }; 2899 int status; 2900 2901 status = nfs_wait_on_sequence(calldata->luargs.seqid, task); 2902 if (status != 0) 2903 return; 2904 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) { 2905 nfs4_locku_complete(calldata); 2906 task->tk_exit = NULL; 2907 rpc_exit(task, 0); 2908 return; 2909 } 2910 rpc_call_setup(task, &msg, 0); 2911 } 2912 2913 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 2914 { 2915 struct nfs4_unlockdata *calldata; 2916 struct inode *inode = state->inode; 2917 struct nfs_server *server = NFS_SERVER(inode); 2918 struct nfs4_lock_state *lsp; 2919 int status; 2920 2921 /* Is this a delegated lock? */ 2922 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) 2923 return do_vfs_lock(request->fl_file, request); 2924 2925 status = nfs4_set_lock_state(state, request); 2926 if (status != 0) 2927 return status; 2928 lsp = request->fl_u.nfs4_fl.owner; 2929 /* We might have lost the locks! */ 2930 if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) 2931 return 0; 2932 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL); 2933 if (calldata == NULL) 2934 return -ENOMEM; 2935 calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid); 2936 if (calldata->luargs.seqid == NULL) { 2937 kfree(calldata); 2938 return -ENOMEM; 2939 } 2940 calldata->luargs.stateid = &lsp->ls_stateid; 2941 calldata->arg.fh = NFS_FH(inode); 2942 calldata->arg.type = nfs4_lck_type(cmd, request); 2943 calldata->arg.offset = request->fl_start; 2944 calldata->arg.length = nfs4_lck_length(request); 2945 calldata->arg.u.locku = &calldata->luargs; 2946 calldata->res.server = server; 2947 calldata->lsp = lsp; 2948 atomic_inc(&lsp->ls_count); 2949 2950 /* Ensure we don't close file until we're done freeing locks! */ 2951 calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data); 2952 2953 atomic_set(&calldata->refcount, 2); 2954 init_completion(&calldata->completion); 2955 2956 status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin, 2957 nfs4_locku_done, calldata); 2958 if (status == 0) 2959 wait_for_completion_interruptible(&calldata->completion); 2960 do_vfs_lock(request->fl_file, request); 2961 nfs4_locku_release_calldata(calldata); 2962 return status; 2963 } 2964 2965 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim) 2966 { 2967 struct inode *inode = state->inode; 2968 struct nfs_server *server = NFS_SERVER(inode); 2969 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 2970 struct nfs_lock_opargs largs = { 2971 .lock_stateid = &lsp->ls_stateid, 2972 .open_stateid = &state->stateid, 2973 .lock_owner = { 2974 .clientid = server->nfs4_state->cl_clientid, 2975 .id = lsp->ls_id, 2976 }, 2977 .reclaim = reclaim, 2978 }; 2979 struct nfs_lockargs arg = { 2980 .fh = NFS_FH(inode), 2981 .type = nfs4_lck_type(cmd, request), 2982 .offset = request->fl_start, 2983 .length = nfs4_lck_length(request), 2984 .u = { 2985 .lock = &largs, 2986 }, 2987 }; 2988 struct nfs_lockres res = { 2989 .server = server, 2990 }; 2991 struct rpc_message msg = { 2992 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 2993 .rpc_argp = &arg, 2994 .rpc_resp = &res, 2995 .rpc_cred = state->owner->so_cred, 2996 }; 2997 int status = -ENOMEM; 2998 2999 largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid); 3000 if (largs.lock_seqid == NULL) 3001 return -ENOMEM; 3002 if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) { 3003 struct nfs4_state_owner *owner = state->owner; 3004 3005 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid); 3006 if (largs.open_seqid == NULL) 3007 goto out; 3008 largs.new_lock_owner = 1; 3009 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); 3010 /* increment open seqid on success, and seqid mutating errors */ 3011 if (largs.new_lock_owner != 0) { 3012 nfs_increment_open_seqid(status, largs.open_seqid); 3013 if (status == 0) 3014 nfs_confirm_seqid(&lsp->ls_seqid, 0); 3015 } 3016 nfs_free_seqid(largs.open_seqid); 3017 } else 3018 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); 3019 /* increment lock seqid on success, and seqid mutating errors*/ 3020 nfs_increment_lock_seqid(status, largs.lock_seqid); 3021 /* save the returned stateid. */ 3022 if (status == 0) { 3023 memcpy(lsp->ls_stateid.data, res.u.stateid.data, 3024 sizeof(lsp->ls_stateid.data)); 3025 lsp->ls_flags |= NFS_LOCK_INITIALIZED; 3026 } else if (status == -NFS4ERR_DENIED) 3027 status = -EAGAIN; 3028 out: 3029 nfs_free_seqid(largs.lock_seqid); 3030 return status; 3031 } 3032 3033 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 3034 { 3035 struct nfs_server *server = NFS_SERVER(state->inode); 3036 struct nfs4_exception exception = { }; 3037 int err; 3038 3039 /* Cache the lock if possible... */ 3040 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) 3041 return 0; 3042 do { 3043 err = _nfs4_do_setlk(state, F_SETLK, request, 1); 3044 if (err != -NFS4ERR_DELAY) 3045 break; 3046 nfs4_handle_exception(server, err, &exception); 3047 } while (exception.retry); 3048 return err; 3049 } 3050 3051 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 3052 { 3053 struct nfs_server *server = NFS_SERVER(state->inode); 3054 struct nfs4_exception exception = { }; 3055 int err; 3056 3057 err = nfs4_set_lock_state(state, request); 3058 if (err != 0) 3059 return err; 3060 do { 3061 err = _nfs4_do_setlk(state, F_SETLK, request, 0); 3062 if (err != -NFS4ERR_DELAY) 3063 break; 3064 nfs4_handle_exception(server, err, &exception); 3065 } while (exception.retry); 3066 return err; 3067 } 3068 3069 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 3070 { 3071 struct nfs4_client *clp = state->owner->so_client; 3072 int status; 3073 3074 down_read(&clp->cl_sem); 3075 /* Is this a delegated open? */ 3076 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 3077 /* Yes: cache locks! */ 3078 status = do_vfs_lock(request->fl_file, request); 3079 /* ...but avoid races with delegation recall... */ 3080 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags)) 3081 goto out; 3082 } 3083 status = nfs4_set_lock_state(state, request); 3084 if (status != 0) 3085 goto out; 3086 status = _nfs4_do_setlk(state, cmd, request, 0); 3087 if (status != 0) 3088 goto out; 3089 /* Note: we always want to sleep here! */ 3090 request->fl_flags |= FL_SLEEP; 3091 if (do_vfs_lock(request->fl_file, request) < 0) 3092 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__); 3093 out: 3094 up_read(&clp->cl_sem); 3095 return status; 3096 } 3097 3098 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 3099 { 3100 struct nfs4_exception exception = { }; 3101 int err; 3102 3103 do { 3104 err = nfs4_handle_exception(NFS_SERVER(state->inode), 3105 _nfs4_proc_setlk(state, cmd, request), 3106 &exception); 3107 } while (exception.retry); 3108 return err; 3109 } 3110 3111 static int 3112 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 3113 { 3114 struct nfs_open_context *ctx; 3115 struct nfs4_state *state; 3116 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 3117 int status; 3118 3119 /* verify open state */ 3120 ctx = (struct nfs_open_context *)filp->private_data; 3121 state = ctx->state; 3122 3123 if (request->fl_start < 0 || request->fl_end < 0) 3124 return -EINVAL; 3125 3126 if (IS_GETLK(cmd)) 3127 return nfs4_proc_getlk(state, F_GETLK, request); 3128 3129 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 3130 return -EINVAL; 3131 3132 if (request->fl_type == F_UNLCK) 3133 return nfs4_proc_unlck(state, cmd, request); 3134 3135 do { 3136 status = nfs4_proc_setlk(state, cmd, request); 3137 if ((status != -EAGAIN) || IS_SETLK(cmd)) 3138 break; 3139 timeout = nfs4_set_lock_task_retry(timeout); 3140 status = -ERESTARTSYS; 3141 if (signalled()) 3142 break; 3143 } while(status < 0); 3144 return status; 3145 } 3146 3147 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl) 3148 { 3149 struct nfs_server *server = NFS_SERVER(state->inode); 3150 struct nfs4_exception exception = { }; 3151 int err; 3152 3153 err = nfs4_set_lock_state(state, fl); 3154 if (err != 0) 3155 goto out; 3156 do { 3157 err = _nfs4_do_setlk(state, F_SETLK, fl, 0); 3158 if (err != -NFS4ERR_DELAY) 3159 break; 3160 err = nfs4_handle_exception(server, err, &exception); 3161 } while (exception.retry); 3162 out: 3163 return err; 3164 } 3165 3166 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 3167 3168 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf, 3169 size_t buflen, int flags) 3170 { 3171 struct inode *inode = dentry->d_inode; 3172 3173 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) 3174 return -EOPNOTSUPP; 3175 3176 if (!S_ISREG(inode->i_mode) && 3177 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX)) 3178 return -EPERM; 3179 3180 return nfs4_proc_set_acl(inode, buf, buflen); 3181 } 3182 3183 /* The getxattr man page suggests returning -ENODATA for unknown attributes, 3184 * and that's what we'll do for e.g. user attributes that haven't been set. 3185 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported 3186 * attributes in kernel-managed attribute namespaces. */ 3187 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf, 3188 size_t buflen) 3189 { 3190 struct inode *inode = dentry->d_inode; 3191 3192 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) 3193 return -EOPNOTSUPP; 3194 3195 return nfs4_proc_get_acl(inode, buf, buflen); 3196 } 3197 3198 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen) 3199 { 3200 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1; 3201 3202 if (buf && buflen < len) 3203 return -ERANGE; 3204 if (buf) 3205 memcpy(buf, XATTR_NAME_NFSV4_ACL, len); 3206 return len; 3207 } 3208 3209 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = { 3210 .recover_open = nfs4_open_reclaim, 3211 .recover_lock = nfs4_lock_reclaim, 3212 }; 3213 3214 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = { 3215 .recover_open = nfs4_open_expired, 3216 .recover_lock = nfs4_lock_expired, 3217 }; 3218 3219 static struct inode_operations nfs4_file_inode_operations = { 3220 .permission = nfs_permission, 3221 .getattr = nfs_getattr, 3222 .setattr = nfs_setattr, 3223 .getxattr = nfs4_getxattr, 3224 .setxattr = nfs4_setxattr, 3225 .listxattr = nfs4_listxattr, 3226 }; 3227 3228 struct nfs_rpc_ops nfs_v4_clientops = { 3229 .version = 4, /* protocol version */ 3230 .dentry_ops = &nfs4_dentry_operations, 3231 .dir_inode_ops = &nfs4_dir_inode_operations, 3232 .file_inode_ops = &nfs4_file_inode_operations, 3233 .getroot = nfs4_proc_get_root, 3234 .getattr = nfs4_proc_getattr, 3235 .setattr = nfs4_proc_setattr, 3236 .lookup = nfs4_proc_lookup, 3237 .access = nfs4_proc_access, 3238 .readlink = nfs4_proc_readlink, 3239 .read = nfs4_proc_read, 3240 .write = nfs4_proc_write, 3241 .commit = nfs4_proc_commit, 3242 .create = nfs4_proc_create, 3243 .remove = nfs4_proc_remove, 3244 .unlink_setup = nfs4_proc_unlink_setup, 3245 .unlink_done = nfs4_proc_unlink_done, 3246 .rename = nfs4_proc_rename, 3247 .link = nfs4_proc_link, 3248 .symlink = nfs4_proc_symlink, 3249 .mkdir = nfs4_proc_mkdir, 3250 .rmdir = nfs4_proc_remove, 3251 .readdir = nfs4_proc_readdir, 3252 .mknod = nfs4_proc_mknod, 3253 .statfs = nfs4_proc_statfs, 3254 .fsinfo = nfs4_proc_fsinfo, 3255 .pathconf = nfs4_proc_pathconf, 3256 .decode_dirent = nfs4_decode_dirent, 3257 .read_setup = nfs4_proc_read_setup, 3258 .write_setup = nfs4_proc_write_setup, 3259 .commit_setup = nfs4_proc_commit_setup, 3260 .file_open = nfs_open, 3261 .file_release = nfs_release, 3262 .lock = nfs4_proc_lock, 3263 .clear_acl_cache = nfs4_zap_acl_attr, 3264 }; 3265 3266 /* 3267 * Local variables: 3268 * c-basic-offset: 8 3269 * End: 3270 */ 3271